CN117506100A

CN117506100A - Welding tongs clamping method and clamping device

Info

Publication number: CN117506100A
Application number: CN202311767128.6A
Authority: CN
Inventors: 袁忠杰
Original assignee: Hefei Sanyu Electric Co ltd
Current assignee: Hefei Sanyu Electric Co ltd
Priority date: 2023-12-20
Filing date: 2023-12-20
Publication date: 2024-02-06

Abstract

The invention discloses a welding tongs clamping method and a clamping device, wherein the clamping method comprises the steps of adopting a C-shaped resistance welding tongs to clamp and weld a workpiece, wherein the C-shaped resistance welding tongs comprise a fixed plate and a static arm fastened in one end of the fixed plate, one end of the static arm is provided with a static electrode, one end of the fixed plate is clamped with a linear driving device, one end of the linear driving device, far away from a driving motor, is provided with a movable electrode, and the movable electrode and the static electrode are used for clamping and welding the workpiece; when the linear driving device drives the electrode to clamp and weld the workpiece, the movable electrode and the fixed plate are converted into a rotatable supporting state, and the movable electrode swings along with the deflection of the workpiece under the action of welding clamping force so as to keep coaxial with the electrostatic electrode. The invention keeps the movable electrode and the static electrode in a coaxial state before welding and in welding pressurizing welding, thereby keeping good contact between welding workpieces and improving welding quality.

Description

Welding tongs clamping method and clamping device

Technical Field

The invention relates to the technical field of welding tongs clamping, in particular to a welding tongs clamping method and a welding tongs clamping device.

Background

In welding application, the resistance spot welder adopts two electrodes to apply certain clamping force to a workpiece and communicate with high current to form nuggets between the workpieces to finish welding, and because the static arm of the welding tongs can generate elastic deformation of the static arm under the action of the clamping force, the static arm electrode deflects to cause that the two opposite electrodes are not coaxial, so that the workpiece and the end face of the electrode cannot be kept parallel, as shown in fig. 15-16, the static arm electrode deflects to generate an offset angle a, the stress of the electrodes is uneven during welding, and the forming unevenness of the nuggets affects the welding quality and the attractiveness.

Particularly, when the resistance welding robot moves the welding nut or the stud, the static arm electrode is offset, so that the welding nut or the stud and the metal plate cannot be parallel, the welding part of the welding nut or the stud and the metal plate cannot be completely attached, the welding foot of the nut part cannot be completely welded with the metal plate, welding is unstable, the welding end face of the stud and the metal plate are inclined, the stud or the nut is not perpendicular to the metal plate, and the welding strength and the assembly of parts are influenced.

In the prior art, as disclosed in chinese patent publication No. CN202963774U, a welding tongs with improved structure is disclosed, in which both a movable electrode arm and a floating electrode arm can move relative to a workpiece to be welded, and the position of the welding electrode can be automatically adjusted even if the electrode cap is worn, but the welding tongs can only adjust the position of the welding electrode, but the problem that the welding electrode is not coaxial and parallel after the electrode is deflected by a clamping force in welding cannot be solved. Therefore, there is a need for improvements in existing welding tongs clamping methods and clamping arrangements.

Disclosure of Invention

The invention aims to solve the technical problem that a welding electrode cannot be coaxial due to bending deformation of a welding arm in welding of a welding clamp in the resistance welding machine, and provides a clamping method and a clamping device for the welding clamp, so that a movable electrode and an electrostatic electrode of a welding gun are coaxial before welding and in the welding process.

In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:

a clamping method of welding tongs is applied to C-shaped resistance welding tongs, and clamping welding is carried out in the following manner: the C-shaped resistance welding tongs comprise a fixed plate and a static arm fastened in one end of the fixed plate, a static electrode is arranged at one end of the static arm, a linear driving device is clamped at one end of the fixed plate, a movable electrode is arranged at one end, far away from the driving motor, of the linear driving device, and the movable electrode and the static electrode are used for clamping and welding the workpiece; when the linear driving device drives the electrode to clamp and weld the workpiece, the movable electrode and the fixed plate are converted into a rotatable supporting state, and the movable electrode swings along with the deflection of the workpiece under the action of welding clamping force so as to keep coaxial with the electrostatic electrode.

By adopting the scheme, the movable electrode and the static electrode which is not extruded are in a coaxial state before welding, so that the movable electrode is kept coaxial with the static electrode before abutting and pressurizing with a workpiece, the movable electrode is converted into a rotatable supporting state in the welding pressurizing process, the movable electrode is bent and deformed in the direction away from the movable electrode when the movable electrode is in the welding pressurizing process, the static electrode is deflected in the direction away from the movable electrode under the action of the jacking clamping force of the movable electrode, the deflection force is transmitted to the movable electrode in the deflection process, and the rotatable movable electrode deflects along with the deflection of the static electrode, so that the movable electrode and the static electrode are kept coaxial in the welding pressurizing process.

In order to achieve the clamping method, the application provides a welding tongs clamping device which comprises a fixed plate and a static arm fixedly connected to the fixed plate, wherein the fixed plate is clamped and fixed on two sides of the static arm, the fixed plate and the static arm enclose a C-shaped structure, and one end of the static arm far away from the fixed plate is fixedly connected with a static electrode; a linear driving device is clamped between the fixing plates, the driving end of the linear driving device is connected with an electrode connecting rod, one end of the electrode connecting rod, which is far away from the linear driving device, is fixedly connected with an electrode, and the electrode and the electrostatic electrode are oppositely arranged to clamp and weld a workpiece;

the side wall of the electrode connecting rod is fixedly connected with a guide pin, the fixed plate is provided with a guide groove axially arranged along the electrode connecting rod, the guide pin is inserted into the guide groove, and the groove width of one end of the guide groove, which is close to the static electrode, is larger than the diameter of the guide pin so that a floating gap is formed between the guide pin and the guide groove in a welding state;

the linear driving device comprises a connecting flange, a pin shaft is fixedly connected to the side wall of the connecting flange, the pin shaft is perpendicular to the driving direction of the linear driving device, an arc-shaped groove is formed in the fixing plate, the pin shaft is inserted into the arc-shaped groove, and the pin shaft swings along the arc-shaped groove in welding to enable the movable electrode to swing along with the deflection of a workpiece so as to be coaxial with the electrostatic electrode. Preferably, the central line of the arc-shaped groove is arc-shaped, and the circle center of the arc-shaped groove is the center position of the welding end surface of the movable electrode when the movable electrode is abutted with the workpiece, so that the movable electrode can swing conveniently.

Through the scheme, when the pressurizing, clamping and welding are performed, the whole movable electrode and an attached driving mechanism are in a swinging state, so that the movable electrode inclines along with the inclination of the static electrode in the direction away from the movable electrode, and at the moment, the movable electrode, the electrode connecting rod and the linear driving device deflect towards the side away from the static arm synchronously, so that the movable electrode and the static electrode are kept coaxial; before welding, when the movable electrode moves to the static electrode, the movable electrode and the static electrode before deformation are in an initial coaxial state, and the movable electrode synchronously deflects along with the static electrode after welding pressurization, so that the movable electrode is coaxial with the static electrode in a state that the static electrode is not subjected to welding clamping force and a state that the static electrode is subjected to welding clamping force, and welding quality is guaranteed. The welding included angle between the movable electrode and the static electrode is avoided, the welding quality problem caused by non-parallel between workpieces is reduced, such as the phenomena of splashing, uneven nugget, unstable welding and the like caused by the included angle of the workpieces are avoided, and particularly, when a welding nut or a stud is welded on a plate, the welding nut or the stud is non-parallel with the plate, so that welding feet cannot be welded firmly and the problem of assembly influence caused by the skew of the welding feet and the plate is solved.

Further, the linear driving device comprises a driving motor and a driving screw rod, a speed reducer integrally connected with the driving motor is arranged on a connecting flange, the connecting flange is arranged on the inner side of a fixing plate on two sides, the driving screw rod is fixedly connected with the output end of the driving motor after the speed reducer changes speed, the driving screw rod is connected with a driving nut through threaded fit, and the driving nut is fixedly connected with the end part of an electrode connecting rod. The driving screw rod rotates to drive the driving nut to move so as to drive the electrode connecting rod to move, so that the electrode connecting rod drives the electrode to clamp and weld the workpiece, and after welding is finished, the electrode is driven to retract away from the workpiece to finish resetting.

Further, a first magnet is arranged on the side wall of the arc-shaped groove far away from the movable electrode, a second magnet is arranged on the side of the pin shaft far away from the movable electrode, the first magnet and the second magnet are oppositely arranged, and the magnetic poles of the surfaces of the first magnet and the second magnet close to each other are the same so as to generate magnetic repulsive force. The pin shaft is supported through magnetic repulsive force generated by the first magnet and the second magnet, in the welding process, the linear driving device drives the movable electrode to move towards the electrostatic electrode to clamp a workpiece, repulsive thrust is generated by the first magnet to the second magnet so as to reduce friction resistance between the pin shaft and the arc-shaped groove, when the static electrode rotates under the action of stress, the movable electrode generates lateral deflection force so that the movable electrode deflects along with the electrostatic electrode, the pin shaft acts on the first magnet through the second magnet so that resistance in the movable electrode deflection process is smaller, the movable electrode is convenient to synchronously deflect with the electrostatic electrode, and further the movable electrode and the electrostatic electrode are guaranteed to synchronously keep coaxial and parallel to the welding end face.

Further, a floating guide block is sleeved on the electrode connecting rod in a penetrating way, the floating guide block is positioned on one side, far away from the linear driving device, of the guide pin, a guide hole matched with the outer wall of the electrode connecting rod is formed in the floating guide block, the electrode connecting rod is in sliding fit along the guide hole so that the electrode connecting rod axially slides along the floating guide block, an eccentric rotating shaft is rotatably connected to the floating guide block, the eccentric rotating shaft comprises a first circular shaft and a second circular shaft eccentrically fixed at two ends of the first circular shaft, the first circular shaft is rotatably connected with the floating guide block, and the second circular shaft is rotatably connected with the fixed plate; the inner side of the fixed plate is provided with a limiting groove, and the floating guide block is positioned in the limiting groove. The electrode connecting rod is guided by the floating guide block, so that the electrode connecting rod is kept stable in movement; when the electrode connecting rod deflects in the welding process, the eccentric rotating shaft enables the floating guide block to swing together with the electrode connecting rod under the action of external force, and when the electrode connecting rod resets, the floating guide block resets along with the electrode connecting rod.

Further, a fourth magnet is fixedly connected to the side wall of the limiting groove on one side far away from the eccentric rotating shaft, a fifth magnet is arranged at one end, far away from the eccentric rotating shaft, of the floating guide block, and magnetic poles of one end, close to each other, of the fifth magnet are different from those of the fourth magnet in a relative mode. The welding deflection force generated during the pressurizing welding is transmitted to the floating guide block, and the deflection force generated by the welding clamping force overcomes the attraction force of the fourth magnet and the fifth magnet in the welding process to separate the fourth magnet from the fifth magnet, so that the electrode connecting rod can deflect freely; when the electrode connecting rod resets, the floating guide block moves along with the electrode connecting rod and is close to the fourth magnet, and the floating guide block is reset in an auxiliary mode through mutual attraction of the fourth magnet and the fifth magnet, so that the resetting accuracy is improved.

Further, the guide groove is provided with a first guide section and a second guide section, the second guide section is positioned at one end of the first guide section, which is close to the movable electrode, the side wall of the first guide section, which is close to the static arm, is flush with the side wall of the second guide section, which is close to the static arm, and is parallel to the axis of the electrode connecting rod, the groove width of the first guide section is consistent with the outer diameter of the guide pin so as to guide the guide pin, and the groove width of the second guide section is larger than the outer diameter of the guide pin so that the guide pin has a free movement gap in the second guide section. The guide groove is arranged into two sections, the first guide section resets the guide pin, and the second guide section enables the guide pin to be in a free swinging state; specifically, as the groove width of the first guide section is consistent with the outer diameter of the guide pin, the center of the guide pin coincides with the center line of the first guide section and resets under the guide action of the first guide section when the guide pin is retracted into the first guide section, and under the combined action of synchronous resetting of the pin shafts, the electrode connecting rod is in an initial state, and at the moment, the movable electrode and the electrostatic electrode at the lower end of the electrode connecting rod are in initial coaxial; when the guide pin moves into the second guide section, the width of the second guide section is larger than that of the guide pin, so that a swing gap exists between the guide pin and the second guide section, the guide pin, the electrode connecting rod fixedly connected with the guide pin and the electrode connecting rod, and the movable electrode are in a free swing state, and the movable electrode swings along with the electrostatic electrode.

In another scheme, a pushing mechanism is arranged on one side of the fixed plate, two states of resetting and free swinging of the electrode connecting rod are switched through the pushing mechanism, and the guide groove is a straight groove with equal width and the groove width is larger than the diameter of the guide pin; the pushing mechanism comprises a second driving device, the driving end of the second driving device is connected with a driving abutting block, the abutting block is located at one side of the electrode connecting rod, which is far away from the fixing plate, and the abutting block is located at the inner side of the fixing plate and is in sliding fit with the fixing plate. When the movable electrode approaches to the electrostatic electrode to clamp a workpiece, the driving end of the second driving device extends out to enable the abutting block to abut against the side wall of the electrode connecting rod, so that the movable electrode on the electrode connecting rod is coaxial with the electrostatic electrode, and when the movable electrode and the electrostatic electrode press-weld the workpiece, the driving end of the second driving device drives the abutting block to be separated from the electrode connecting rod, so that the electrode connecting rod is in a follow-up electrode swinging state; after the welding is finished, when the movable electrode is far away from the static electrode, the driving end of the second driving device extends out to enable the abutting block to abut against the side wall of the electrode connecting rod, so that the electrode connecting rod is reset to the initial position.

Further, the linear driving device also comprises a reset mechanism, wherein the reset mechanism is used for carrying out auxiliary reset on the linear driving device.

In one scheme, the reset mechanism comprises a third magnet, the third magnet is located on one side of the linear driving device, the third magnet is fixedly connected with the fixing plate relatively, and the third magnet is used for adsorbing a metal shell of the linear driving device to assist the linear driving device to reset. When welding is performed, the linear driving device applies welding pressure to the workpiece, the deflection force overcomes the magnetic attraction force between the third magnet and the shell of the linear driving device under the deflection of the electrostatic electrode, so that the linear driving device deflects, the movable electrode and the electrostatic electrode are kept to synchronously deflect and swing, when the linear driving device drives the movable electrode to move upwards to reset after welding is finished, the linear driving device approaches to the third magnet, and when the third magnet and the shell of the linear driving device generate the magnetic attraction force, the linear driving device is quickly reset to an initial state, and therefore the resetting accuracy and the resetting speed are improved.

In another scheme, canceling release mechanical system is including fixing the post that resets on flange, fixedly connected with mounting panel on the fixed plate, the through-hole has been seted up on the mounting panel, sliding connection has the piece that resets in the through-hole, the piece that resets is located the post that resets and is close to straight line drive arrangement axis one side, the orientation post one end that resets of piece is provided with the inclined plane that resets, fixedly connected with ejector pin on the electrode connecting rod, the ejector pin is kept away from movable electrode one end and is faced the piece that resets, thereby drive the ejector pin when straight line drive arrangement drive electrode connecting rod moves to straight line drive arrangement end to reset post direction and pass and make the inclined plane extrusion post that resets reset to reset the straight line drive arrangement of slope and reset and just.

Further, reset piece is kept away from reset post one end fixedly connected with baffle, the reset piece outside is provided with compression spring, compression spring is located between mounting panel and the baffle, thereby will reset the piece top when the ejector pin is kept away from reset piece when compression spring's elasticity makes the ejector pin keep away from reset post and make sharp drive arrangement be in free swing state.

According to the reset mechanism adopting the scheme, when the linear driving device drives the electrode connecting rod and the movable electrode to move towards the workpiece, the reset block is separated from the reset column, so that the linear driving device is in an automatic swinging state along the arc-shaped groove, when the movable electrode clamps the workpiece, the movable electrode swings along with the swinging of the static electrode and the workpiece, and the linear driving device coaxial with the movable electrode is driven to swing freely, so that the movable electrode and the static electrode are kept coaxial, and the phenomenon that the movable electrode cannot swing freely due to the fact that the linear driving device is clamped is avoided; after welding is completed, the linear driving device drives the electrode connecting rod and the electrode to move away from the direction of the static electrode, the electrode connecting rod drives the ejector rod to push the reset block in the moving process of moving away from the static electrode, and the reset block extrudes the reset column through the reset inclined plane, so that the reset column moves away from the axis direction of the linear driving device, the linear driving device swinging outwards and deflecting in the welding process is righted and reset, and the electrode connecting rod is reset to an initial position through the guide groove or the pushing mechanism, so that the electrode connecting rod and the electrode at the lower end of the linear driving device are in an initial coaxial state with the static electrode which is not acted by the clamping force.

The welding tongs clamping method and the welding tongs clamping device provided by the invention have the following beneficial effects: when the device works, the linear driving device drives the electrode connecting rod to move downwards, the electrode connecting rod drives the movable electrode to move downwards to the upper part of the static electrode in a linear manner, and the movable electrode and the static electrode are kept coaxial under the condition of no clamping force; during pressure welding, the electrode connecting rod is in a left-right free swinging state, a swinging gap exists between a second transmission pin on the linear driving device and the arc-shaped groove, so that the electrode connecting rod and the linear driving device connected with the electrode connecting rod are in the left-right free swinging state, the linear driving device drives the movable electrode to move towards the direction of the electrostatic electrode to apply welding pressure to a workpiece, the static electrode deflects under the action of clamping force, the movable electrode, the electrode connecting rod and the linear driving device synchronously swing along with the electrostatic electrode under the action of deflection force generated by deflection of the electrostatic electrode, and therefore the movable electrode and the electrostatic electrode are kept in a coaxial state before welding and during welding pressurizing welding, good contact between welding workpieces is kept, welding quality is improved, and particularly, the welding strength of a welding nut or a stud can be ensured when the nut or the stud is welded.

Drawings

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:

FIG. 1 is a schematic structural view of a welding tongs clamping device provided by the invention;

FIG. 2 is a schematic side cross-sectional view of the electrode connecting rod of FIG. 1;

FIG. 3 is a schematic view of a structure of a welding tongs clamping device with a pushing mechanism according to the present invention;

FIG. 4 is a schematic top view of the abutment block of FIG. 3;

FIG. 5 is a schematic view of a partial structure of an arc slot with a first magnet in a welding tongs clamping device according to the present invention;

FIG. 6 is a schematic view of a welding tongs clamping mechanism with floating guide blocks according to the present invention;

FIG. 7 is a schematic side cross-sectional view of the electrode connecting rod of FIG. 6;

FIG. 8 is a schematic side cross-sectional view of the eccentric shaft position of FIG. 6;

FIG. 9 is a schematic perspective view of an eccentric shaft;

FIG. 10 is a schematic view of the internal structure of the floating guide block in the clamping device of the welding tongs;

FIG. 11 is a schematic structural view of an embodiment of a welding tongs clamping mechanism with a reset mechanism according to the present invention;

FIG. 12 is a schematic view of the partial structure of the portion A in FIG. 11;

FIG. 13 is a schematic view showing the structure of an initial state of a welding tongs clamping device according to the present invention;

FIG. 14 is a schematic view of a press welding state of a welding tongs clamping device according to the present invention;

FIG. 15 is a schematic diagram of a prior art structure;

fig. 16 is a partial schematic view of the portion of fig. 15.

The reference numerals in the figures illustrate: 1. a fixing plate; 11. a guide groove; 111. a first guide section; 112. a second guide section; 12. an arc-shaped groove; 121. a first magnet; 122. a second magnet; 13. a limit groove; 14. a fourth magnet; 15. a fifth magnet; 2. a static arm; 21. a static electrode; 3. a linear driving device; 31. a connecting flange; 32. a driving motor; 33. driving a screw rod; 34. a pin shaft; 4. an electrode connecting rod; 41. a guide pin; 5. a movable electrode; 6. a floating guide block; 7. an eccentric rotating shaft; 71. a first circular shaft; 72. a second circular shaft; 8. a pushing mechanism; 81. a second driving device; 82. an abutment block; 91. a third magnet; 92. a reset column; 93. a mounting plate; 94. a reset block; 941. resetting the inclined plane; 95. a push rod; 96. a baffle; 97. a compression spring; 10. a sheet material; 101. and welding a nut.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The following description of the technical solutions in the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, in the embodiments of the present invention, all directional indicators (such as up-down-left-right-front-rear … …) are merely used to explain the relative positional relationship between the components, motion, etc. in a specific posture (as shown in the drawings), if the specific posture is changed, the directional indicators correspondingly change, and the connection may be a direct connection or an indirect connection.

As shown in fig. 1, a clamp clamping method is applied to a C-type resistance welding clamp, and clamp welding is performed as follows: the C-shaped resistance welding tongs are used for clamping and welding a workpiece, and comprise a fixed plate 1 and a static arm 2 fastened in one end of the fixed plate 1, wherein a static electrode 21 is arranged at one end of the static arm 2, a linear driving device 3 is clamped at one end of the fixed plate 1, a movable electrode 5 is arranged at one end, far away from a driving motor, of the linear driving device 3, and the movable electrode 5 and the static electrode 21 are used for clamping and welding the workpiece; when the linear driving device 3 drives the movable electrode 5 to clamp and weld the workpiece, the movable electrode 5 and the fixed plate 1 are converted into a rotatable supporting state, and the movable electrode 5 swings along with the deflection of the workpiece under the action of welding clamping force in welding so as to keep coaxial with the static electrode 21.

By adopting the scheme, the movable electrode 5 and the non-extruded static electrode 21 are in a coaxial state before welding, so that the movable electrode 5 is kept coaxial with the static electrode 21 before abutting and pressurizing with a workpiece, the movable electrode 5 is converted into a rotatable supporting state in the welding and pressurizing process, the movable electrode 21 is deflected away from the movable electrode 5 by the jacking clamping force of the movable electrode 5 when the movable electrode 5 is welded and pressurized, the deflection force generated in the deflection process is transmitted to the movable electrode 5, and the rotatable movable electrode 5 is synchronously deflected along with the deflection of the static electrode 21, so that the movable electrode 5 is kept coaxial with the static electrode 21 in the welding and pressurizing process.

In order to achieve the above-mentioned clamping method, the invention provides a welding tongs clamping device, as shown in fig. 1-2, including fixed plate 1 and fixed arm 2 fixedly connected to fixed plate 1, the said fixed plate 1 has 2 pieces and clamps and fixes on both sides of fixed arm 2 separately, the said fixed plate 1 encloses and forms the C-type structure with fixed arm 2, the one end far away from fixed plate 1 of the said fixed arm 2 fixedly connects with the static electrode 21; a linear driving device 3 is clamped between the two fixed plates 1, an electrode connecting rod 4 is connected to the driving end of the linear driving device 3, an electrode 5 is fixedly connected to one end, far away from the linear driving device 3, of the electrode connecting rod 4, and the electrode 5 and a static electrode 21 are oppositely arranged to clamp and weld workpieces between the electrode connecting rods;

the side wall of the electrode connecting rod 4 is fixedly connected with a guide pin 41, the fixed plate 1 is provided with a guide groove 11 axially arranged along the electrode connecting rod 4, the guide pin 41 is inserted into the guide groove 11, and the groove width of one end, close to the static electrode 21, of the guide groove 11 is larger than the diameter of the guide pin 41 so that a floating gap is formed between the guide pin 41 and the guide groove 11 in a welding state;

the linear driving device 3 comprises a connecting flange 31, a pin roll 34 is fixedly connected to the side wall of the connecting flange 31, the pin roll 34 is arranged perpendicular to the driving direction of the linear driving device 3, an arc groove 12 is formed in the fixing plate 1, the pin roll 34 is inserted into the arc groove 12, and the pin roll 34 swings along the arc groove 12 in welding to enable the movable electrode 5 to swing along with workpiece deflection so as to keep coaxial with the electrostatic electrode 21. Preferably, the center line of the arc-shaped groove 12 is in a circular arc shape, and the center of the circular arc is the center position of the welding end surface of the movable electrode 5 when the movable electrode 5 is abutted against the workpiece, so that the movable electrode 5 can swing conveniently.

Through the scheme, during pressure clamping welding, the whole movable electrode 5 and an attached driving mechanism are in a swingable state, so that the movable electrode 5 inclines along with the inclination of the static electrode 21 in the direction away from the movable electrode 5, and at the moment, the movable electrode 5, the electrode connecting rod 4 and the linear driving device 3 deflect towards the side away from the static arm 2 synchronously, so that the movable electrode 5 and the static electrode 21 are kept coaxial; before welding, when the movable electrode 5 moves towards the static electrode 21, the movable electrode 5 and the static electrode 21 before being deformed are in an initial coaxial state, and the movable electrode 5 deflects synchronously with the static electrode 21 after welding pressurization, so that the movable electrode 5 and the static electrode 21 are automatically centered in welding, and the movable electrode 5 and the static electrode 21 are kept coaxial under the state that the static electrode 21 is not subjected to welding clamping force and the state that the static electrode 21 is subjected to welding clamping force, and therefore welding quality is guaranteed. The welding included angle between the movable electrode 5 and the electrostatic electrode 21 is avoided, so that the problem of welding quality caused by non-parallel between workpieces is reduced, such as splashing, uneven nugget, unstable welding and the like caused by the included angle of the workpieces are avoided, and particularly, when the welding nut 101 or the stud is welded on the plate 10, the problem that welding feet cannot be welded firmly and the assembly is influenced by the fact that the welding nut 101 or the stud is non-parallel with the plate 10 is solved.

Specifically, the linear driving device 3 comprises a driving motor 32 and a driving screw 33, a speed reducer integrally connected with the driving motor 32 is mounted on a connecting flange 31, the connecting flange 31 is arranged on the inner side of the fixing plate 1 on two sides, the driving screw 33 is fixedly connected with the output end of the driving motor 32 after the speed reducer is changed, the driving screw 33 is connected with a driving nut through threaded fit, and the driving nut is fixedly connected with the end part of the electrode connecting rod 4. The driving screw rod 33 rotates to drive the driving nut to move so as to drive the electrode 5 to move, so that the electrode connecting rod 4 drives the movable electrode 5 to clamp and weld the workpiece, and after the welding is finished, the movable electrode 5 is driven to retract away from the workpiece to finish resetting.

As shown in fig. 5, in an embodiment, a first magnet 121 is disposed on a side wall of the arc-shaped slot 12 away from the moving electrode 5, a second magnet 122 is disposed on a side of the pin 34 away from the moving electrode 5, the first magnet 121 and the second magnet 122 are disposed opposite to each other, and magnetic poles of a side of the first magnet 121 and a side of the second magnet 122 close to each other are the same to generate magnetic repulsive force. The pin shaft 34 is supported by magnetic repulsive force generated by the first magnet 121 and the second magnet 122, in the welding process, the linear driving device 3 drives the movable electrode 5 to move towards the static electrode 21 to clamp a workpiece, repulsive thrust is generated by the first magnet 121 to the second magnet 122 so as to reduce friction resistance between the pin shaft 34 and the arc-shaped groove 12, when the static electrode 21 rotates under stress, lateral deflection force is generated by the movable electrode 5 so that the movable electrode 5 deflects along with the static electrode 21, and the pin shaft 34 acts with the first magnet 121 through the second magnet 122 so that resistance in the deflection process of the movable electrode 5 is smaller, the movable electrode 5 is conveniently kept synchronously deflected with the static electrode 21, and further, the movable electrode 5 and the static electrode 21 are ensured to synchronously keep coaxial and parallel to the welding end face.

In an embodiment, as shown in fig. 6-9, a floating guide block 6 is sleeved on the electrode connecting rod 4, the floating guide block 6 is located at one side of the guide pin 41 away from the linear driving device 3, a guide hole matched with the outer wall of the electrode connecting rod 4 is formed in the floating guide block 6, the electrode connecting rod 4 is in sliding fit along the guide hole so as to enable the electrode connecting rod 4 to axially slide along the floating guide block 6, an eccentric rotating shaft 7 is rotatably connected to the floating guide block 6, the eccentric rotating shaft 7 comprises a first circular shaft 71 and second circular shafts 72 eccentrically fixed at two ends of the first circular shaft 71, and the two second circular shafts 72 located at two ends of the first circular shaft 71 are coaxially arranged; the first circular shaft 71 is rotatably connected with the floating guide block 6, and the second circular shaft 72 is rotatably connected with the fixed plate 1; the inner side of the fixed plate 1 is provided with a limit groove 13, and the floating guide block 6 is positioned in the limit groove 13. The electrode connecting rod 4 is guided by the floating guide block 6, so that the electrode connecting rod 4 is kept stable in moving; when the electrode connecting rod 4 deflects in the welding process, the floating guide block 6 can rotate and also can move by utilizing the eccentric rotating shaft 7, the floating guide block 6 swings together with the electrode connecting rod 4 under the action of external force on the eccentric rotating shaft 7, and when the electrode connecting rod 4 resets, the floating guide block 6 resets along with the electrode connecting rod 4.

In an embodiment, as shown in fig. 10, a fourth magnet 14 is fixedly connected to a side wall of the limiting groove 13 on one side far away from the eccentric rotating shaft 7, a fifth magnet 15 is disposed at one end of the floating guide block 6 far away from the eccentric rotating shaft 7, and magnetic poles of one end of the fifth magnet 15, which is opposite to the fourth magnet 14 and is close to each other, are different. The welding deflection force generated during the pressurizing welding is transmitted to the floating guide block 6, and the deflection force generated by the welding clamping force overcomes the suction force of the fourth magnet 14 and the fifth magnet 15 in the welding process so that the fourth magnet 14 and the fifth magnet 15 are separated, thereby enabling the electrode connecting rod 4 to deflect freely; when the electrode connecting rod 4 resets, the floating guide block 6 moves along with the electrode connecting rod 4 to approach the fourth magnet 14, and the floating guide block 6 is mutually attracted by the fourth magnet 14 and the fifth magnet 15 to be assisted in resetting, so that the resetting accuracy is improved. In use, the magnetic attraction between the fourth magnet 14 and the fifth magnet 15 is less than the deflection force generated by the welding pressurization to enable separation of the fourth magnet 14 and the fifth magnet 15.

As shown in fig. 1, in an embodiment, the guide groove 11 has a first guide section 111 and a second guide section 112, the second guide section 112 is located at one end of the first guide section 111 near the movable electrode 5, a side wall of the first guide section 111 near the static arm 2 is flush with a side wall of the second guide section 112 near the static arm 2 and parallel to an axis of the electrode connecting rod 4, a groove width of the first guide section 111 coincides with an outer diameter of the guide pin 41 to guide the guide pin 41, and a groove width of the second guide section 112 is larger than an outer diameter of the guide pin 41 so that the guide pin 41 has a free movement gap in the second guide section 112. By providing the guide groove 11 in two sections, the first guide section 111 resets the guide pin 41, and the second guide section 112 makes the guide pin 41 in a free swing state; specifically, since the groove width of the first guide section 111 is consistent with the outer diameter of the guide pin 41, when the guide pin 41 is retracted into the first guide section 111, the center of the guide pin 41 is coincident with the center line of the first guide section 111 under the guide action of the first guide section 111, and under the combined action of synchronous reset of the pin shafts 34, the electrode connecting rod 4 is in an initial state, and at the moment, the movable electrode 5 at the lower end of the electrode connecting rod 4 and the electrostatic electrode 21 are in initial coaxial; when the guide pin 41 moves into the second guide section 112, the width of the second guide section 112 is larger than that of the guide pin 41, so that a swinging gap exists between the guide pin 41 and the second guide section 112, the guide pin 41, the electrode connecting rod 4 fixedly connected with the guide pin and the movable electrode 5 are in a free swinging state, and the movable electrode 5 swings along with the static electrode 21.

In another embodiment, as shown in fig. 3-4, a pushing mechanism 8 is arranged on one side of the fixed plate 1, the electrode connecting rod 4 is switched between a reset state and a free swinging state by the pushing mechanism 8, and the guide groove 11 is a straight groove with equal width and has a groove width larger than the diameter of the guide pin 41; the pushing mechanism 8 comprises a second driving device 81, a driving end of the second driving device 81 is connected with a driving abutting block 82, the abutting block 82 is located at one side of the electrode connecting rod 4 away from the fixed plate 1, and the abutting block 82 is located at the inner side of the fixed plate 1 and is in sliding fit with the fixed plate 1. When the movable electrode 5 approaches to the static electrode 21 to clamp a workpiece, the driving end of the second driving device 81 extends to enable the abutting block 82 to abut against the side wall of the electrode connecting rod 4, so that the movable electrode 5 on the electrode connecting rod 4 and the static electrode 21 are kept coaxial, and when the movable electrode 5 and the static electrode 21 press-weld the workpiece, the driving end of the second driving device 81 drives the abutting block 82 to be separated from the electrode connecting rod 4, so that the electrode connecting rod 4 is in a swinging state of the movable electrode 5; after the welding is completed, when the movable electrode 5 is far away from the static electrode 21, the driving end of the second driving device 81 extends to abut the abutting block 82 on the side wall of the electrode connecting rod 4 so that the electrode connecting rod 4 is reset to the initial position.

In a further embodiment, a welding tongs clamping device further comprises a resetting mechanism for assisting in resetting the linear drive 3.

In one implementation, as shown in fig. 1, the reset mechanism includes a third magnet 91, where the third magnet 91 is located on one side of the linear driving device 3, the third magnet 91 is fixedly connected with the fixing plate 1 relatively, and the third magnet 91 is used to adsorb a metal casing of the linear driving device 3 to assist the reset of the linear driving device 3. When welding is performed, the linear driving device 3 applies welding pressure to the workpiece, the deflection force overcomes the magnetic attraction force between the third magnet 91 and the outer shell of the linear driving device 3 under the deflection of the static electrode 21, so that the linear driving device 3 deflects, the movable electrode 5 and the static electrode 21 are kept to synchronously deflect and swing, when the linear driving device 3 drives the movable electrode 5 to move upwards to reset after welding is finished, the linear driving device 3 approaches to the direction of the third magnet 91, and when the third magnet 91 and the outer shell of the linear driving device 3 generate the magnetic attraction force, the linear driving device 3 is quickly reset to an initial state, and therefore the resetting accuracy and the resetting speed are improved.

In another embodiment, as shown in fig. 11-12, the reset mechanism includes a reset post 92 fixed on the connecting flange 31, a mounting plate 93 is fixedly connected to the fixing plate 1, a through hole is formed in the mounting plate 93, a reset block 94 is slidably connected in the through hole, the reset block 94 is located at one side of the reset post 92, which is close to the axis of the linear driving device 3, a reset inclined plane 941 is disposed at one end, facing the reset post 92, of the reset block 94, a push rod 95 is fixedly connected to the electrode connecting rod 4, one end, far away from the movable electrode 5, of the push rod 95 faces the reset block 94, when the linear driving device 3 drives the electrode 5 connecting rod 4 to move towards the linear driving device 3, the push rod 95 is driven to push the reset block 94 towards the reset post 92 so that the reset inclined plane 941 extrudes the reset post 92, and the inclined linear driving device 3 is reset and aligned.

Specifically, the reset block 94 is kept away from reset post 92 one end fixedly connected with baffle 96, the reset block 94 outside is provided with compression spring 97, compression spring 97 is located between mounting panel 93 and the baffle 96, and compression spring 97's elasticity makes ejector pin 95 keep away from reset post 92 with reset block 94 top when keeping away from reset block 94 thereby makes sharp drive arrangement 3 be in the free swing state.

By adopting the reset mechanism of the scheme, when the linear driving device 3 drives the electrode 5 to connect the rod 4 and the movable electrode 5 to move towards a workpiece, the reset block 94 is separated from the reset column 92, so that the linear driving device 3 is in an automatic swinging state along the arc-shaped groove 12, when the movable electrode 5 clamps the workpiece, the movable electrode 5 swings along with the swinging of the fixed electrode 21 and the workpiece, and the linear driving device 3 coaxial with the movable electrode 5 is driven to swing freely, thereby realizing that the movable electrode 5 and the fixed electrode 21 are kept coaxial, and avoiding the phenomenon that the movable electrode 5 cannot swing freely due to the clamping of the linear driving device 3; after the welding is finished, the linear driving device 3 drives the electrode 5 to move along the direction that the connecting rod 4 and the electrode 5 are far away from the static electrode 21, the electrode connecting rod 4 drives the ejector rod 95 to push the reset block 94 in the moving process of far away from the static electrode 21, the reset block 94 presses the reset column 92 through the reset inclined plane 941, so that the reset column 92 moves in the axial direction far away from the linear driving device 3, the linear driving device 3 swinging outwards and deflecting in the welding process is righted and reset, the electrode connecting rod 4 is reset to the initial position through the guide groove 11 or the pushing mechanism 8, and the electrode connecting rod 4 and the electrode 5 at the lower end of the linear driving device 3 are in an initial coaxial state with the static electrode 21 which is not acted by the clamping force.

The driving part formed by the driving motor 32 and the driving screw 33 in the linear driving device 3 may be replaced by an air cylinder, a hydraulic cylinder, or an electric cylinder.

According to the technical scheme, as shown in fig. 13-14, when the welding nut is welded to a plate, the electrode connecting rod 4 is driven to move downwards by the linear driving device 3 on the welding tongs, the movable electrode 5 is driven to move downwards by the electrode connecting rod 4 to the upper side of the static electrode 21, at the moment, the movable electrode 5 and the static electrode 21 are in an initial coaxial state, during welding, the movable electrode 5, the electrode connecting rod 4 and the linear driving device 3 are in a free swinging state in the vertical axial direction, during pressurizing and welding, the static electrode 21 is transmitted to the static arm 2 by welding pressure, the static arm 2 generates bending deformation to enable the welding end face of the static electrode 21 to deflect, the welding plate 10 in contact with the welding end face of the welding static electrode 21 deflects, so that deflection component force is generated between the welding nut 101 and the plate 10, under the action of welding deflection force, the movable electrode 5 in contact with the welding nut 101 deflects, the movable electrode 5 in a swinging free state, the electrode connecting rod 4 and the linear driving device 3 deflect, the movable electrode 5 and the static electrode 21 deflect synchronously and keep coaxial, the movable electrode 5 and the static electrode 21 are kept in a coaxial state, the welding state is kept, the welding core state is kept, the welding end face of the welding nut is kept in a state, the welding end face is not parallel with the welding end face of the welding plate is prevented from being in contact with the welding plate 10, the welding end face is not parallel, and the welding end face is not parallel to be prevented from being influenced, and the welding problem is avoided, and welding problem is caused, and welding problem is caused, welding between welding quality is caused, and welding plate is caused.

The technical scheme does not relate to the fact that the technical scheme can be achieved through the prior art.

The foregoing has outlined and described the basic principles, main features and features of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention as claimed includes the appended claims and equivalents thereof.

Claims

1. A welding tongs clamping method is characterized in that: the clamp welding is performed as follows: the C-shaped resistance welding tongs are used for clamping and welding a workpiece, and comprise a fixed plate (1) and a static arm (2) fastened in one end of the fixed plate (1), a static electrode (21) is arranged at one end of the static arm (2), a linear driving device (3) is clamped at one end of the fixed plate (1), a movable electrode (5) is arranged at one end, far away from a driving motor, of the linear driving device (3), and the movable electrode (5) and the static electrode (21) are used for clamping and welding the workpiece; when the linear driving device (3) drives the movable electrode (5) to clamp and weld a workpiece, the movable electrode (5) and the fixed plate (1) are converted into a rotatable supporting state, and the movable electrode (5) swings along with the deflection of the workpiece under the action of welding clamping force so as to keep coaxial with the electrostatic electrode (21).

2. The utility model provides a welding tongs clamping device which characterized in that: the electrostatic clamp comprises a fixed plate (1) and a static arm (2) fixedly connected to the fixed plate (1), wherein the fixed plate (1) is clamped and fixed on two sides of the static arm (2), and one end, far away from the fixed plate (1), of the static arm (2) is fixedly connected with an electrostatic electrode (21); a linear driving device (3) is clamped between the fixing plates (1), an electrode connecting rod (4) is connected to the driving end of the linear driving device (3), an electrode (5) is fixedly connected to one end, far away from the linear driving device (3), of the electrode connecting rod (4), and the electrode (5) and the electrostatic electrode (21) are oppositely arranged to clamp and weld a workpiece;

the electrode connecting rod (4) is fixedly connected with a guide pin (41) on the side wall, a guide groove (11) axially arranged along the electrode connecting rod (4) is formed in the fixing plate (1), the guide pin (41) is inserted into the guide groove (11), and the groove width of one end, close to the static electrode (21), of the guide groove (11) is larger than the diameter of the guide pin (41) so that a floating gap is formed between the guide pin (41) and the guide groove (11) in a welding state;

the linear driving device (3) comprises a connecting flange (31), a pin shaft (34) is fixedly connected to the side wall of the connecting flange (31), the pin shaft (34) is vertically arranged in the driving direction of the linear driving device (3), an arc-shaped groove (12) is formed in the fixing plate (1), the pin shaft (34) is inserted into the arc-shaped groove (12), and the pin shaft (34) swings along the arc-shaped groove (12) in welding to enable the movable electrode (5) to swing along with workpiece deflection so as to be coaxial with the electrostatic electrode (21).

3. A welding tongs clamping arrangement as set forth in claim 2 wherein: the linear driving device (3) comprises a driving motor (32) and a driving screw rod (33), a speed reducer integrally connected with the driving motor (32) is arranged on a connecting flange (31), the connecting flange (31) is arranged on the inner side of a fixed plate (1) on two sides, the driving screw rod (33) is fixedly connected to the output end of the driving motor (32) after the speed reducer is changed, the driving screw rod (33) is connected with a driving nut through threaded fit, and the driving nut is fixedly connected to the end part of an electrode connecting rod (4).

4. A welding tongs clamping arrangement as set forth in claim 2 wherein: the arc-shaped groove (12) is far away from a side wall on one side of the movable electrode (5) and is provided with a first magnet (121), one side of the pin shaft (34) far away from the movable electrode (5) is provided with a second magnet (122), the first magnet (121) and the second magnet (122) are oppositely arranged, and magnetic poles of one sides, close to each other, of the first magnet (121) and the second magnet (122) are identical to generate magnetic repulsive force.

5. A welding tongs clamping arrangement as set forth in claim 2 wherein: the electrode connecting rod (4) is sleeved with a floating guide block (6), the floating guide block (6) is located on one side, far away from the linear driving device (3), of a guide pin (41), a guide hole matched with the outer wall of the electrode connecting rod (4) is formed in the floating guide block (6), the electrode connecting rod (4) is in sliding fit with the guide hole along the guide hole so that the electrode connecting rod (4) axially slides along the floating guide block (6), an eccentric rotating shaft (7) is rotationally connected onto the floating guide block (6), the eccentric rotating shaft (7) comprises a first circular shaft (71) and second circular shafts (72) eccentrically fixed at two ends of the first circular shaft (71), the first circular shaft (71) is rotationally connected with the floating guide block (6), and the second circular shaft (72) is rotationally connected with the fixed plate (1). The inner side of the fixed plate (1) is provided with a limiting groove (13), and the floating block is positioned in the limiting groove (13).

6. A welding tongs clamping arrangement as set forth in claim 2 wherein: the guide groove (11) is provided with a first guide section (111) and a second guide section (112), the second guide section (112) is located at one end of the first guide section (111) close to the movable electrode (5), the side wall of the first guide section (111) close to the static arm (2) is flush with the side wall of the second guide section (112) close to the static arm (2) and parallel to the axis of the electrode connecting rod (4), the groove width of the first guide section (111) is consistent with the outer diameter of the guide pin (41) so as to guide the guide pin (41), and the groove width of the second guide section (112) is larger than the outer diameter of the guide pin (41) so that the guide pin (41) has a free movement gap in the second guide section (112).

7. A welding tongs clamping arrangement as set forth in claim 2 wherein: one side of fixed plate (1) is provided with pushing mechanism (8), pushing mechanism (8) are including second drive arrangement (81), the drive end of second drive arrangement (81) is connected with drive butt piece (82), butt piece (82) are located one side that fixed plate (1) was kept away from to electrode connecting rod (4), butt piece (82) are located fixed plate (1) inboard and with fixed plate (1) sliding fit.

8. A welding tongs clamping arrangement as set forth in claim 2 wherein: the linear driving device is characterized by further comprising a reset mechanism, wherein the reset mechanism comprises a third magnet (91), the third magnet (91) is positioned on one side of the linear driving device (3), the third magnet (91) is fixedly connected with the fixing plate (1) relatively, and the third magnet (91) is used for adsorbing a metal shell of the linear driving device (3) to assist the linear driving device (3) to reset.

9. A welding tongs clamping arrangement as set forth in claim 2 wherein: the reset mechanism comprises a reset post (92) fixed on a connecting flange (31), a mounting plate (93) is fixedly connected to a fixing plate (1), a through hole is formed in the mounting plate (93), a reset block (94) is connected to the through hole in a sliding mode, the reset block (94) is located on one side, close to the axis of a linear driving device (3), of the reset post (92), a reset inclined plane (941) is arranged at one end, facing the reset post (92), of the reset block (94), a push rod (95) is fixedly connected to an electrode connecting rod (4), one end, facing the reset block (94), of the push rod (95) is far away from a movable electrode (5), and the linear driving device (3) drives the push rod (95) to reset the reset post (92) in the direction pushing the reset inclined plane (941) to reset the inclined linear driving device (3) when the connecting rod (4) moves towards the linear driving device (3).

10. A welding tongs clamping arrangement as set forth in claim 9 wherein: reset piece (94) are kept away from reset post (92) one end fixedly connected with baffle (96), reset piece (94) outside is provided with compression spring (97), compression spring (97) are located between mounting panel (93) and baffle (96), thereby the elasticity of compression spring (97) makes ejector pin (95) keep away from reset piece (94) when pushing up reset piece (94) and is kept away from reset post (92) so that sharp drive arrangement (3) are in free swing state.