CN110695904B

CN110695904B - Floating tightening mechanism and tightening device

Info

Publication number: CN110695904B
Application number: CN201910996269.2A
Authority: CN
Inventors: 刘亚纯; 何健樟; 胡为纬; 彭亦强
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Intelligent Equipment Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Intelligent Equipment Co Ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2021-05-04
Anticipated expiration: 2039-10-18
Also published as: CN110695904A

Abstract

The invention provides a floating screwing mechanism and a screwing device, wherein a sleeve of the floating screwing mechanism is provided with a barrel and a connector arranged on the barrel, the outer peripheral surface of the connector is provided with a first limiting groove, and the connector is arranged in an installation cavity of a floating head in a penetrating manner; in the direction along the preset central line, a first movable gap is formed between the connector and the floating head; in the direction perpendicular to the preset central line, a second movable gap is formed between the connector and the floating head; the first limiting piece is arranged on the floating head, and at least one part of the first limiting piece protrudes out of the inner wall of the mounting cavity to penetrate into the first limiting groove; a third movable gap is formed between the first limiting piece and the inner wall of the first limiting groove in the direction along the preset central line; in the direction perpendicular to the preset central line, a fourth movable gap is formed between the first limiting part and the inner wall of the first limiting groove, so that the floating head can float in a certain range relative to the sleeve, and the adaptability and the screwing success rate are improved.

Description

Floating tightening mechanism and tightening device

Technical Field

The invention relates to the technical field of fastening piece tightening, in particular to a floating tightening mechanism and a tightening device.

Background

In the production assembly, often need to screw up the fastener that has the screw thread, in order to improve production efficiency, have among the prior art and can centre gripping fastener and automatic screw up the tightening mechanism on the work piece with the fastener, the fastener is placed and is had position error easily in tightening mechanism, the fastener also easily produces position error when corresponding with the work piece, and current tightening device is poor to the adaptability of above-mentioned error, causes the problem of screwing up the failure easily.

Disclosure of Invention

The invention provides a floating screwing mechanism and a screwing device, which aim to improve the adaptability of the existing screwing mechanism to the position error of a fastener or a workpiece and improve the screwing success rate.

To achieve the above object, according to one aspect of the present invention, there is provided a floating tightening mechanism including: the sleeve is rotatably arranged along a preset central line and comprises a barrel body and a connector arranged on the barrel body, and a first limiting groove is formed in the outer peripheral surface of the connector; the floating head is provided with an accommodating cavity and an installation cavity, the accommodating cavity is used for placing a fastener to be screwed, and the connector is arranged in the installation cavity in a penetrating mode; in the direction along the preset central line, a first movable gap is formed between the connector and the floating head; in the direction perpendicular to the preset central line, a second movable gap is formed between the connector and the floating head; the first limiting piece is arranged on the floating head, and at least one part of the first limiting piece protrudes out of the inner wall of the mounting cavity so as to penetrate into the first limiting groove; a third movable gap is formed between the first limiting piece and the inner wall of the first limiting groove in the direction along the preset central line; in a direction perpendicular to the preset central line, a fourth movable gap is formed between the first limiting piece and the inner wall of the first limiting groove; the sleeve drives under the pivoted condition the head that floats rotates to through the head that floats moves the fastener rotates, through first clearance, the second clearance, the third clearance and the cooperation of fourth clearance, the head that floats can float at the pivoted in-process relatively the sleeve.

Furthermore, in the direction perpendicular to the preset central line, the section of the connector is of a polygonal structure; the shape of the inner wall of the mounting cavity is matched with the shape of the outer peripheral surface of the connector.

Furthermore, a plurality of planes are arranged on the peripheral surface of the connector, and the first limiting grooves are positioned on two adjacent planes; the first limiting groove and the first limiting part are multiple, and the first limiting groove and the first limiting part are arranged in a one-to-one correspondence mode.

Further, the first limiting piece is movably arranged on the floating head so as to adjust the depth penetrating into the first limiting groove.

Further, have the second spacing groove on the lateral wall of barrel, the second spacing groove is followed the axial extension of barrel, the mechanism of screwing up floats still includes: the driving shaft penetrates through the cylinder body, the driving shaft is rotatably arranged, and the cylinder body and the driving shaft can relatively move in the axial direction of the cylinder body; the elastic piece is arranged in the cylinder body, and two ends of the elastic piece are respectively abutted against the end part of the driving shaft and the bottom wall in the cylinder body; and the second limiting piece is arranged on the driving shaft and penetrates through the second limiting groove so as to limit the relative position of the cylinder and the driving shaft in the circumferential direction.

According to another aspect of the present invention, there is provided a tightening device including a fixed seat, a sliding seat slidably provided on the fixed seat, and a floating tightening mechanism provided on the sliding seat to slide the floating tightening mechanism by the sliding seat.

Further, the tightening device further includes: the clamping mechanism is arranged on the fixed seat and corresponds to a floating head of the floating screwing mechanism, at least one part of the structure of the clamping mechanism is movably arranged so as to clamp or loosen a workpiece, and the floating head is used for screwing a fastener on the workpiece clamped by the clamping mechanism.

Further, the tightening mechanism that floats is a plurality of, and is a plurality of the tightening mechanism interval that floats sets up on the sliding seat, tightening device still includes: the driving part is arranged on the fixed seat and used for driving the floating tightening mechanisms to synchronously rotate.

Further, the driving part includes: the driving wheels are in driving connection with the floating tightening mechanisms in a one-to-one correspondence manner; and the driving belt is rotatably arranged and is in driving connection with the driving wheels.

Further, the tightening device further includes: the push rod is movably arranged in the floating screwing mechanism in a penetrating mode and used for pushing out the fastener located in the floating head of the floating screwing mechanism.

The technical scheme of the invention is applied, and the floating screwing mechanism comprises a sleeve, a floating head and a first limiting piece, wherein the sleeve is provided with a barrel body and a connector arranged on the barrel body, the peripheral surface of the connector is provided with a first limiting groove, and the connector is arranged in an installation cavity of the floating head in a penetrating manner; in the direction along the preset central line, a first movable gap is formed between the connector and the floating head; in the direction perpendicular to the preset central line, a second movable gap is formed between the connector and the floating head; the first limiting piece is arranged on the floating head, and at least one part of the first limiting piece protrudes out of the inner wall of the mounting cavity to penetrate into the first limiting groove; a third movable gap is formed between the first limiting piece and the inner wall of the first limiting groove in the direction along the preset central line; on the direction of the central line is predetermine to the perpendicular to, have the fourth clearance between the inner wall of first locating part and first spacing groove, the head that floats like this can float at certain extent at the relative sleeve of pivoted in-process to under the condition that there is the error in the corresponding position of the position of placing or fastener and work piece of fastener, adapt to and adjust through the floating of the head that floats, thereby still can screw up the fastener to the work piece on, improved the adaptability and the success rate of screwing up of device.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 illustrates a schematic structural view of a floating tightening mechanism provided by an embodiment of the present invention;

FIG. 2 shows a cross-sectional view of the floating tightening mechanism of FIG. 1;

FIG. 3 shows a perspective view of the sleeve of FIG. 1;

fig. 4 is a schematic structural view of a tightening apparatus provided by an embodiment of the present invention;

fig. 5 shows a top view of the tightening device in fig. 4.

Wherein the figures include the following reference numerals:

110. a sleeve; 111. a barrel; 112. a connector; 113. a first limit groove; 114. a second limit groove; 120. a floating head; 131. a first limit piece; 132. a limiting sleeve; 133. carrying out top thread; 141. a drive shaft; 142. an elastic member; 143. a second limiting member;

210. a fixed seat; 220. a sliding seat; 230. a guide portion; 240. a first cylinder;

310. a clamping mechanism; 311. a clamping block; 312. a guide block; 313. a driving seat; 314. a second cylinder;

410. a drive section; 411. a drive wheel; 412. a drive belt; 413. a tension wheel; 414. a transmission belt;

511. a push rod; 512. and a third cylinder.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in the drawings, embodiments of the present invention provide a floating tightening mechanism comprising: the sleeve 110, the sleeve 110 is rotatably arranged along a preset central line, the sleeve 110 includes a cylinder 111 and a connector 112 arranged on the cylinder 111, and the outer peripheral surface of the connector 112 has a first limit groove 113; the floating head 120 is provided with an accommodating cavity and a mounting cavity, the accommodating cavity is used for placing a fastener to be screwed, and the connector 112 is arranged in the mounting cavity in a penetrating manner; in the direction along the preset central line, a first movable gap is formed between the connecting head 112 and the floating head 120; in the direction perpendicular to the preset central line, a second movable gap is formed between the connecting head 112 and the floating head 120; the first limiting piece 131 is arranged on the floating head 120, and at least one part of the first limiting piece 131 protrudes out of the inner wall of the installation cavity to penetrate into the first limiting groove 113; in the direction along the preset center line, a third movable gap is formed between the first limiting member 131 and the inner wall of the first limiting groove 113; in a direction perpendicular to the preset center line, a fourth movable gap is formed between the first limiting member 131 and the inner wall of the first limiting groove 113; the sleeve 110 drives the floating head 120 to rotate under the condition of rotation, so that the floating head 120 drives the fastener to rotate, and the floating head 120 can float relative to the sleeve 110 in the rotating process through the matching of the first movable gap, the second movable gap, the third movable gap and the fourth movable gap.

The technical scheme of the invention is applied, and the floating screwing mechanism comprises a sleeve 110, a floating head 120 and a first limiting piece 131, wherein the sleeve 110 is provided with a cylinder 111 and a connector 112 arranged on the cylinder 111, the outer peripheral surface of the connector 112 is provided with a first limiting groove 113, and the connector 112 is arranged in an installation cavity of the floating head 120 in a penetrating manner; in the direction along the preset central line, a first movable gap is formed between the connecting head 112 and the floating head 120; in the direction perpendicular to the preset central line, a second movable gap is formed between the connecting head 112 and the floating head 120; the first limiting member 131 is arranged on the floating head 120, and at least a part of the first limiting member 131 protrudes out of the inner wall of the mounting cavity to penetrate into the first limiting groove 113; in the direction along the preset center line, a third movable gap is formed between the first limiting member 131 and the inner wall of the first limiting groove 113; in the direction perpendicular to the preset central line, a fourth movable gap is formed between the first limiting member 131 and the inner wall of the first limiting groove 113, so that the floating head 120 can float in a certain range relative to the sleeve 110 in the rotating process, and under the condition that the placing position of the fastener or the corresponding position of the fastener and the workpiece has errors, the floating head 120 can be adapted and adjusted through floating, so that the fastener can be screwed to the workpiece, and the adaptability and the screwing success rate of the device are improved.

In the present embodiment, floating the floating head 120 relative to the sleeve 110 means that the floating head 120 is movable in a certain length range in the axial direction of the sleeve 110, movable in a certain length range in the radial direction of the sleeve 110, and deflectable in a certain angle range in the axial direction of the sleeve 110 relative to the sleeve 110. The axial direction of the sleeve 110 is the direction of the predetermined center line, and the radial direction of the sleeve 110 is the direction perpendicular to the predetermined center line.

In the present embodiment, in a direction perpendicular to the preset center line, the cross section of the connecting head 112 is a polygonal structure; the shape of the inner wall of the mounting cavity matches the shape of the outer peripheral surface of the connector 112. Therefore, the circumference of the sleeve 110 and the floating head 120 can be limited through the polygonal structure, so that the floating head 120 is driven to rotate through the rotation of the sleeve 110.

In this embodiment, the outer peripheral surface of the connecting head 112 has a plurality of planes, and the first limiting groove 113 is located on two adjacent planes; the first limiting grooves 113 and the first limiting members 131 are multiple, and the multiple first limiting grooves 113 and the multiple first limiting members 131 are arranged in a one-to-one correspondence manner. The first limiting grooves 113 are disposed on two adjacent planes to facilitate the floating head 120 to move relative to the sleeve 110. By providing the plurality of first limiting grooves 113 and the plurality of first limiting members 131, the reliability of limiting can be improved.

In this embodiment, the first position-limiting member 131 is movably disposed on the floating head 120 to adjust the depth of penetration into the first position-limiting groove 113. Therefore, the limit range can be adjusted by adjusting the depth of the first limit groove 113, namely, the movable range of the floating head 120 relative to the sleeve 110 is adjusted, and the flexibility of the floating tightening mechanism is improved. Alternatively, the first position-limiting member 131 is a screw, so that the position adjustment can be realized through a threaded connection.

Optionally, the floating tightening mechanism further includes a limiting sleeve 132 and a jackscrew 133, the limiting sleeve 132 is disposed in the accommodating cavity, the limiting sleeve 132 is used for limiting the circumferential direction of the fastener, and the jackscrew 133 is inserted into the floating head 120 to fix the limiting sleeve 132.

In this embodiment, the side wall of the cylinder 111 has a second limiting groove 114, the second limiting groove 114 extends along the axial direction of the cylinder 111, and the floating tightening mechanism further includes: a driving shaft 141 inserted into the cylinder 111, the driving shaft 141 being rotatably provided, the cylinder 111 and the driving shaft 141 being relatively movable in the axial direction of the cylinder 111; an elastic member 142 disposed in the cylinder 111, both ends of the elastic member 142 abutting against the end of the driving shaft 141 and the bottom wall of the cylinder 111; and a second stopper 143 provided on the driving shaft 141, the second stopper 143 being inserted into the second stopper groove 114 to restrict a relative position of the cylinder 111 and the driving shaft 141 in a circumferential direction. This allows sleeve 110 and floating head 120 to be rotated by drive shaft 141 to effect a tightening operation on the fastener. The fastener can be a nut or the like.

Another embodiment of the present invention provides a tightening device, which includes a fixed seat 210, a sliding seat 220, and a floating tightening mechanism, wherein the sliding seat 220 is slidably disposed on the fixed seat 210, and the floating tightening mechanism is disposed on the sliding seat 220 to drive the floating tightening mechanism to slide through the sliding seat 220. Since the fastener approaches the workpiece along the axis of rotation during tightening of the fastener, the fastener can be pushed in the direction of the workpiece by the above arrangement, on the one hand, the fastener is prevented from coming out of the floating head 120, and on the other hand, screwing-in is facilitated. In the present embodiment, the sliding direction of the sliding seat 220 is a direction along a preset center line.

Optionally, the tightening device further comprises a guide part 230, the guide part 230 being used to guide the sliding seat 220. The guiding portion 230 includes a guide rail and a slider, wherein the guide rail is fixedly disposed on the fixing base 210, the slider is fixedly disposed on the sliding base 220, and the slider can slide on the guide rail to achieve guiding.

Optionally, the tightening device further comprises a first cylinder 240, the first cylinder 240 is disposed on the fixed seat 210, and the first cylinder 240 is used for pushing the sliding seat 220 to move.

In this embodiment, the tightening device further includes: and a clamping mechanism 310 disposed on the fixed base 210, the clamping mechanism 310 being disposed in correspondence with the floating head 120 of the floating tightening mechanism, at least a portion of the structure of the clamping mechanism 310 being movably disposed to clamp or loosen a workpiece, the floating head 120 being configured to tighten a fastener onto the workpiece clamped by the clamping mechanism 310. This allows the fastener to be automatically tightened to the workpiece by the cooperation of the clamping mechanism 310 and the floating tightening mechanism.

Optionally, the clamping mechanism 310 includes two clamping blocks 311, the two clamping blocks 311 can approach or move away from each other, the clamping mechanism 310 further includes two guide blocks 312, the guide blocks 312 have a first inclined surface, the clamping blocks 311 have a second inclined surface, the first inclined surface is matched with the second inclined surface, and the two clamping blocks 311 respectively move along the two second inclined surfaces to approach or move away from each other.

Optionally, the clamping mechanism 310 further includes a driving seat 313, the driving seat 313 is vertically movably disposed, both of the clamping blocks 311 are horizontally movably disposed on the driving seat 313, and the vertical movement of the driving seat 313 can drive the two clamping blocks 311 to respectively move along the second inclined planes to achieve the approaching or the distancing. The clamping mechanism 310 further comprises a second air cylinder 314, and the second air cylinder 314 drives the driving seat 313 to lift;

optionally, a spring is arranged between the driving seat 313 and the fixed seat 210, so that the driving seat 313 is automatically lifted to the initial position by the spring when the workpiece is not required to be clamped, and the two clamping blocks 311 release the workpiece. Further, a spring is provided between the two clamp blocks 311 to allow the two clamp blocks 311 to release the workpiece by the spring when the workpiece does not need to be clamped.

In this embodiment, the floating tightening mechanisms are plural, and the plural floating tightening mechanisms are disposed at intervals on the sliding seat 220, and the tightening device further includes: and the driving part 410 is arranged on the fixed seat 210, and the driving part 410 is used for driving the plurality of floating tightening mechanisms to synchronously rotate. Therefore, a plurality of fasteners can be simultaneously screwed, and the working efficiency of the screwing device is improved. Moreover, the device structure can be simplified by driving a plurality of floating tightening mechanisms to rotate synchronously by using one set of driving part 410.

In the present embodiment, the driving part 410 includes: the driving wheels 411 are in driving connection with the floating tightening mechanisms in a one-to-one correspondence mode; and a driving belt 412 which is rotatably arranged, wherein the driving belt 412 is in driving connection with the plurality of driving wheels 411. The arrangement is simple in structure and reduces cost.

Alternatively, the driving wheel 411 is a synchronous wheel, the driving belt 412 is a synchronous belt, the driving unit 410 further includes a tension wheel 413, and the tension wheel 413 is pressed against the driving belt 412. The driving portion 410 further includes a first driving wheel, a second driving wheel, a motor and a driving belt 414, the first driving wheel is disposed on a floating tightening mechanism to drive the driving wheel 411 and the driving belt 412 to rotate, the second driving wheel is disposed on the motor, the second driving wheel and the first driving wheel are connected through the driving belt 414, and the motor drives the second driving wheel to rotate to realize movement. This facilitates the structural arrangement and can realize the deceleration.

In this embodiment, the tightening device further includes: a push rod 511 is movably disposed through the floating tightening mechanism, the push rod 511 being configured to push out a fastener disposed within the floating head 120 of the floating tightening mechanism. Therefore, after the tightening operation is completed, the fastener in the floating head 120 can be pushed out through the movement of the push rod 511, the automatic operation is realized, and the production efficiency is improved.

Alternatively, the driving shaft 141, the sleeve 110 and the floating head 120 are all hollow structures, and the push rod 511 sequentially passes through the driving shaft 141, the sleeve 110 and the floating head 120. The tightening device further comprises a third air cylinder 512, the third air cylinder 512 is arranged on the fixed seat 210, and the third air cylinder 512 is used for pushing the push rod 511 to move.

By applying the technical scheme of the invention, a floating screwing mechanism and a screwing device are provided, wherein a second movable gap is formed between the connecting head 112 and the floating head 120 in the direction perpendicular to the preset central line; the first limiting member 131 is arranged on the floating head 120, and at least a part of the first limiting member 131 protrudes out of the inner wall of the mounting cavity to penetrate into the first limiting groove 113; in the direction along the preset center line, a third movable gap is formed between the first limiting member 131 and the inner wall of the first limiting groove 113; in the direction perpendicular to the preset central line, a fourth movable gap is formed between the first limiting member 131 and the inner wall of the first limiting groove 113, so that the floating head 120 can float in a certain range relative to the sleeve 110 in the rotating process, and under the condition that the placing position of the fastener or the corresponding position of the fastener and the workpiece has errors, the floating head 120 can be adapted and adjusted through floating, so that the fastener can be screwed to the workpiece, and the adaptability and the screwing success rate of the device are improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A floating tightening mechanism, comprising:

the sleeve (110) is rotatably arranged along a preset central line, the sleeve (110) comprises a cylinder body (111) and a connector (112) arranged on the cylinder body (111), and the outer peripheral surface of the connector (112) is provided with a first limiting groove (113);

the floating head (120) is provided with an accommodating cavity and a mounting cavity, the accommodating cavity is used for accommodating a fastener to be screwed, and the connecting head (112) penetrates through the mounting cavity; a first movable gap is formed between the connecting head (112) and the floating head (120) along the direction of the preset central line; in the direction perpendicular to the preset central line, a second movable gap is formed between the connecting head (112) and the floating head (120);

the first limiting piece (131) is arranged on the floating head (120), and at least one part of the first limiting piece (131) protrudes out of the inner wall of the mounting cavity so as to penetrate into the first limiting groove (113); in the direction along the preset central line, a third movable gap is formed between the first limiting piece (131) and the inner wall of the first limiting groove (113); in the direction perpendicular to the preset central line, a fourth movable gap is formed between the first limiting piece (131) and the inner wall of the first limiting groove (113);

the sleeve (110) drives the floating head (120) to rotate under the condition of rotation, so that the floating head (120) drives the fastener to rotate, and the floating head (120) can float relative to the sleeve (110) in the rotating process through the matching of the first movable gap, the second movable gap, the third movable gap and the fourth movable gap.

2. The floating tightening mechanism according to claim 1, characterized in that the cross-section of the connecting head (112) in a direction perpendicular to the predetermined center line is a polygonal structure; the shape of the inner wall of the mounting cavity is matched with the shape of the outer peripheral surface of the connecting head (112).

3. The floating tightening mechanism of claim 2,

the outer peripheral surface of the connecting head (112) is provided with a plurality of planes, and the first limiting groove (113) is positioned on two adjacent planes;

the number of the first limiting grooves (113) and the number of the first limiting pieces (131) are multiple, and the first limiting grooves (113) and the first limiting pieces (131) are arranged in a one-to-one correspondence manner.

4. The floating tightening mechanism according to claim 1, characterized in that the first stop member (131) is movably provided on the floating head (120) to adjust the depth of penetration into the first stop groove (113).

5. The floating screw down mechanism according to claim 1, wherein the cylinder (111) has a second stopper groove (114) on a side wall thereof, the second stopper groove (114) extending in an axial direction of the cylinder (111), the floating screw down mechanism further comprising:

a driving shaft (141) inserted into the cylinder (111), wherein the driving shaft (141) is rotatably arranged, and the cylinder (111) and the driving shaft (141) can relatively move in the axial direction of the cylinder (111);

an elastic member (142) disposed in the cylinder (111), both ends of the elastic member (142) abutting against the end of the drive shaft (141) and the bottom wall of the cylinder (111), respectively;

and a second stopper (143) provided to the drive shaft (141), wherein the second stopper (143) is inserted into the second stopper groove (114) to restrict a relative position of the cylinder (111) and the drive shaft (141) in a circumferential direction.

6. A tightening device, characterized in that the tightening device comprises a fixed seat (210), a sliding seat (220), and a floating tightening mechanism, wherein the sliding seat (220) is slidably disposed on the fixed seat (210), and the floating tightening mechanism is disposed on the sliding seat (220) to be slid by the sliding seat (220), and the floating tightening mechanism is the floating tightening mechanism according to any one of claims 1 to 5.

7. The tightening device according to claim 6, further comprising:

the clamping mechanism (310) is arranged on the fixed seat (210), the clamping mechanism (310) is arranged corresponding to a floating head (120) of the floating tightening mechanism, at least one part of the structure of the clamping mechanism (310) is movably arranged to clamp or loosen a workpiece, and the floating head (120) is used for screwing a fastener on the workpiece clamped by the clamping mechanism (310).

8. The tightening apparatus according to claim 6, wherein the floating tightening mechanism is plural, and plural floating tightening mechanisms are provided at intervals on the sliding seat (220), the tightening apparatus further comprising:

the driving part (410) is arranged on the fixed seat (210), and the driving part (410) is used for driving the floating tightening mechanisms to synchronously rotate.

9. The tightening device according to claim 8, characterized in that the drive portion (410) includes:

the driving wheels (411) are in driving connection with the floating tightening mechanisms in a one-to-one correspondence mode;

a drive belt (412) rotatably disposed, the drive belt (412) being in driving connection with each of the plurality of drive wheels (411).

10. The tightening device according to claim 6, further comprising:

a push rod (511) movably disposed through the floating tightening mechanism, the push rod (511) for pushing out a fastener located within a floating head (120) of the floating tightening mechanism.