CN116989876B - Weighing device with overload protection function - Google Patents
Weighing device with overload protection function Download PDFInfo
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- CN116989876B CN116989876B CN202310934585.3A CN202310934585A CN116989876B CN 116989876 B CN116989876 B CN 116989876B CN 202310934585 A CN202310934585 A CN 202310934585A CN 116989876 B CN116989876 B CN 116989876B
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- 238000005303 weighing Methods 0.000 title claims abstract description 61
- 230000000670 limiting effect Effects 0.000 claims abstract description 216
- 239000000725 suspension Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
- G01G21/08—Bearing mountings or adjusting means therefor
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- Measurement Of Force In General (AREA)
Abstract
The invention discloses a weighing device with an overload protection function, which comprises a base, a cantilever sensor and a limiting module, wherein the base is provided with a limiting cavity, and the limiting cavity is provided with a first avoiding port; the cantilever sensor is positioned on the upper side of the base, one end of the cantilever sensor is a fixed end fixedly connected to the base, and the other end of the cantilever sensor is a suspended end which is suspended relative to the base; the limiting module is at least partially positioned in the limiting cavity, penetrates through the first avoidance port and is connected with the suspension end of the cantilever sensor, or the suspension end of the cantilever sensor penetrates through the avoidance hole and is connected with the limiting module; the two opposite side walls of the first avoiding opening and the lower side wall of the limiting cavity can form a limiting effect on the limiting module. The weighing device provided by the invention has more comprehensive overload protection function and higher reliability.
Description
Technical Field
The invention relates to the technical field of weighing devices, in particular to a weighing device with an overload protection function.
Background
The existing weighing device adopting the cantilever sensor for weighing generally comprises a base and the cantilever sensor, wherein one end of the cantilever sensor is fixed on the base, the other end of the cantilever sensor is suspended, a bearing frame is arranged at the suspended end of the cantilever sensor, and a weight is loaded on the bearing frame during weighing. Some existing weighing devices are provided with a protection bolt on a base, and under the overload condition of the weighing device, the protection bolt is abutted with the bearing frame or the suspension end of the cantilever sensor to form a limit and a support, so that the cantilever sensor is protected, and damage caused by overlarge bending degree of the cantilever sensor is avoided. However, in a specific use process of the weighing device, the cantilever sensor may be damaged due to the fact that the cantilever sensor suspension end is too twisted in the width direction, or the cantilever sensor suspension end is accidentally pulled upwards too high, so that the cantilever sensor is damaged, and in the two situations, the protection bolt cannot play an effective protection role.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the weighing device with the overload protection function is more comprehensive in overload protection function and higher in working reliability.
The weighing device with the overload protection function comprises a base, a cantilever sensor and a limiting module, wherein the base is provided with a limiting cavity, and the limiting cavity is provided with a first avoiding port; the cantilever sensor is positioned on the upper side of the base, one end of the cantilever sensor is a fixed end fixedly connected to the base, and the other end of the cantilever sensor is a suspended end which is suspended relative to the base; the limiting module is at least partially positioned in the limiting cavity, and the limiting module penetrates through the first avoidance port and is connected with the suspension end of the cantilever sensor, or the suspension end of the cantilever sensor penetrates through the first avoidance port and is connected with the limiting module; the two opposite side walls of the first avoiding opening and the lower side wall of the limiting cavity can form a limiting effect on the limiting module, so that the upper and lower movable ranges of the suspended end of the cantilever sensor and the torsion angle range of the suspended end of the cantilever sensor in the width direction can be limited.
The weighing device with the overload protection function has at least the following beneficial effects: the opposite two side walls of the first avoiding port and the lower side wall of the limiting cavity can form a limiting effect on the limiting module, so that the upper and lower movable ranges of the cantilever beam sensor and the torsion angle range of the cantilever beam sensor in the width direction can be limited, accordingly, the condition that the cantilever beam sensor is overlarge in downward moving stroke of the cantilever beam when overloaded can be avoided, the condition that the cantilever beam sensor is damaged due to overlarge torsion degree of the cantilever beam sensor in the width direction can be avoided, various protection effects are formed, the overload protection function of the weighing device is more comprehensive, and the working reliability is higher.
According to some embodiments of the invention, an adjusting device is arranged between the base and the limiting module, and the adjusting device is used for adjusting the moving range of the limiting module.
According to some embodiments of the invention, the limit module comprises a mount having a horizontally disposed limit plate; the lower side wall of the limiting cavity is provided with a first mounting hole, the adjusting device comprises a first bolt which is in threaded connection with the first mounting hole, and the distance between the first bolt and the lower side surface of the limiting plate can be adjusted by rotating the first bolt; the second mounting holes are formed in two opposite side walls of the first avoidance hole, the adjusting device comprises a second bolt which is in threaded connection with the second mounting holes, and the distance between the second bolt and the upper side face of the limiting plate can be adjusted by rotating the second bolt.
According to some embodiments of the invention, the first mounting holes are four and are rectangular in distribution, the second mounting holes are four, two of the second mounting holes are located on one side wall of the first avoidance hole, and the other two of the second mounting holes are located on the other side wall of the first avoidance hole.
According to some embodiments of the invention, the preset distance between the upper side of the limiting plate and the second bolt far from the fixed end is smaller than the preset distance between the upper side of the limiting plate and the second bolt near the fixed end, and the distance between the two second bolts far from the fixed end is smaller than the distance between the two second bolts near the fixed end.
According to some embodiments of the invention, an inlet and an outlet are formed in one side surface of the base in the width direction, the inlet and the outlet are communicated with the first avoidance opening and the limiting cavity, the inlet and the outlet are used for allowing the limiting module to enter and exit the limiting cavity, a third mounting hole is formed in the mounting seat along the up-down direction, a third bolt is mounted in the third mounting hole, the third bolt is connected with the cantilever sensor, and an avoidance hole for mounting the third bolt is formed in the lower side wall of the limiting cavity.
According to some embodiments of the invention, the limiting module comprises a first limiting piece and a second limiting piece, wherein the first limiting piece and the second limiting piece are positioned in the limiting cavity, the first limiting piece is movably installed on the cantilever beam sensor, the second limiting piece is positioned on the lower side of the first limiting piece, the first limiting piece can be moved to adjust the distance between the first limiting piece and the lower side wall of the limiting cavity, and the second limiting piece can be moved to adjust the distance between the first limiting piece and the two side walls opposite to the first avoiding opening.
According to some embodiments of the invention, the limiting module comprises a mounting seat, the mounting seat is connected with the cantilever sensor, the first limiting piece is sleeved on the mounting seat and is in threaded connection with the mounting seat, a first sleeve is arranged on the first limiting piece, and the second limiting piece is sleeved on the first sleeve and is in threaded connection with the first sleeve.
According to some embodiments of the invention, a second avoidance port is formed in the lower side wall of the limiting cavity, the first avoidance port and the second avoidance port are both arranged along the length direction of the cantilever sensor, the base is provided with an inlet and an outlet communicated with the first avoidance port and the limiting cavity, the inlet and the outlet are located at one side of the first avoidance port in the length direction, and the inlet and the outlet are used for the limiting module to enter and exit the limiting cavity.
According to some embodiments of the invention, a portion of the first stop and a portion of the second stop protrude from the access opening.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a weighing apparatus with overload protection according to a first embodiment of the present invention;
fig. 2 is a cross-sectional view of the weighing apparatus with overload protection function shown in fig. 1;
FIG. 3 is an enlarged view of FIG. 2 at A;
FIG. 4 is a schematic bottom view of the weighing apparatus with overload protection shown in FIG. 1;
FIG. 5 is a schematic view of the base (four second mounting holes in a rectangular arrangement) of the weighing apparatus with overload protection function shown in FIG. 1;
FIG. 6 is a schematic view of the base (four second mounting holes in a trapezoidal arrangement) of the weighing apparatus with overload protection function shown in FIG. 1;
FIG. 7 is a schematic diagram of a limiting module of the weighing device with overload protection shown in FIG. 1 limiting a downward movement range of a suspended end;
Fig. 8 is a schematic diagram of a limiting module of the weighing device with overload protection function shown in fig. 1 limiting a torsion angle of a suspended end in a width direction;
FIG. 9 is a schematic diagram of a weighing apparatus with overload protection according to a second embodiment of the present invention;
fig. 10 is a cross-sectional view of the weighing apparatus with overload protection function shown in fig. 9;
FIG. 11 is a schematic bottom view of the weighing apparatus with overload protection shown in FIG. 9;
FIG. 12 is a schematic dimensional view of a limit module of the weighing device with overload protection shown in FIG. 9;
FIG. 13 is a schematic dimensional view of the base of the weighing apparatus with overload protection shown in FIG. 9;
Fig. 14 is a schematic diagram of a limiting module of the weighing device with overload protection shown in fig. 9 limiting a torsion angle of a suspended end in a width direction;
Fig. 15 is a schematic diagram of a limiting module of the weighing device with overload protection shown in fig. 9 limiting a downward movement range of a suspended end.
Reference numerals:
Base 100, spacing chamber 110, import and export 111, first dodge mouth 120, first mounting hole 130, second mounting hole 140, second dodge mouth 150, dodge hole 160, cantilever sensor 200, stiff end 210, suspension end 220, spacing module 300, mount 310, third mounting hole 311, limiting plate 320, first limiting piece 330, first sleeve 331, second limiting piece 340, second sleeve 341, first bolt 410, second bolt 420.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1,2, 9 and 10, a weighing device with overload protection function according to an embodiment of the present invention includes a base 100, a cantilever sensor 200 and a limiting module 300, where the base 100 is provided with a limiting cavity 110, and the limiting cavity 110 is provided with a first avoiding port 120; the cantilever sensor 200 is located at the upper side of the base 100, one end of the cantilever sensor 200 is a fixed end 210 fixedly connected to the base 100, and the other end of the cantilever sensor 200 is a suspended end 220 suspended relative to the base 100; the limiting module 300 is at least partially positioned in the limiting cavity 110, and the limiting module 300 is penetrated through the first avoidance port 120 and is connected with the suspension end 220 of the cantilever sensor 200, or the suspension end 220 of the cantilever sensor 200 is penetrated through the first avoidance port 120 and is connected with the limiting module 300; the opposite two sidewalls of the first avoidance opening 120 and the lower sidewall of the limiting cavity 110 can form a limiting effect on the limiting module 300, so that the vertical movement range of the suspended end 220 of the cantilever sensor 200 and the torsion angle range of the suspended end 220 of the cantilever sensor 200 in the width direction can be limited. By adopting the arrangement, the condition that the downward movement stroke of the suspension end 220 of the cantilever beam is overlarge when the cantilever beam sensor 200 is overloaded can be avoided, the condition that the torsion degree of the suspension end 220 of the cantilever beam sensor 200 is overlarge in the width direction can be avoided, and the condition that the cantilever beam sensor 200 is damaged due to the fact that the suspension end 220 of the cantilever beam sensor 200 is lifted up accidentally can also be avoided, so that at least three overload protection functions are formed, the overload protection function of the weighing device is more comprehensive, and the working reliability is higher.
Referring to fig. 1 and 9, the weighing device provided by the invention can form at least three overload protection effects by only arranging one limiting module 300 and one limiting cavity 110, and does not need to configure corresponding overload protection structures for one overload condition, so that the weighing device has a simple structure and is beneficial to assembly of the weighing device.
Referring to fig. 1 to 3, it is conceivable that in a specific implementation process, due to factors such as machining errors and assembly errors, a certain deviation exists between an actual movable range of the limit module 300 and a designed movable range, and for this purpose, in some embodiments, an adjusting device is disposed between the base 100 and the limit module 300, and the adjusting device is used to adjust the movable range of the limit module 300, so that the actual movable range of the limit module 300 can be adjusted to meet a use requirement through the adjusting device.
Referring to fig. 1-3, it is envisioned that in some embodiments, the spacing module 300 includes a mount 310, the mount 310 having a horizontally disposed spacing plate 320; the lower side wall of the limiting cavity 110 is provided with a first mounting hole 130, the adjusting device comprises a first bolt 410 which is in threaded connection with the first mounting hole 130, wherein the distance between the first bolt 410 and the lower side surface of the limiting plate 320 can be adjusted by rotating the first bolt 410, and further the downward moving range and the torsion angle range of the limiting module 300 can be adjusted; the second mounting holes 140 are formed in two opposite side walls of the first avoidance opening 120, and the adjusting device comprises a second bolt 420 screwed with the second mounting holes 140, wherein the distance between the second bolt 420 and the upper side surface of the limiting plate 320 can be adjusted by rotating the second bolt 420, and then the upward moving range and the torsion angle range of the limiting module 300 can be adjusted. With the above arrangement, the gap between each first bolt 410 and the limiting plate 320 and the gap between each second bolt 420 and the limiting plate 320 can be adjusted, so that the movement range of the limiting module 300 can be flexibly and accurately adjusted.
It is conceivable that in some embodiments, when the movable range of the limit module 300 needs to be adjusted, a first plug gauge with a thickness of s 1, a second plug gauge with a thickness of s 21, and a third plug gauge with a thickness of s 22 may be prepared in advance, where the first plug gauge and the second plug gauge are both sheet-shaped, during adjustment, the first plug gauge may be plugged between the first bolt 410 and the limit plate 320, and then the first bolt 410 is screwed, so that the first bolt 410 presses the first plug gauge against the limit plate 320, and then the first plug gauge is pulled away, thereby enabling a preset distance between the first bolt 410 and the limit plate 320 to be s 1; similarly, a second plug gauge with the thickness s 21 can be plugged between the second bolt 420 of the close fixed end 210 and the limiting plate 320, then the second bolt 420 is screwed up, so that the second bolt 420 presses the second plug gauge on the limiting plate 320, and then the second plug gauge is pulled away, thereby enabling the preset distance between the second bolt 420 of the close fixed end 210 and the limiting plate 320 to be s 21; a third plug gauge with a thickness s 22 may be inserted between the second bolt 420 far from the fixed end 210 and the limiting plate 320, and then the second bolt 420 is screwed to make the second bolt 420 press the third plug gauge against the limiting plate 320, and then the third plug gauge is pulled away, so that a preset distance between the second bolt 420 near the fixed end 210 and the limiting plate 320 is s 22. By adopting the adjusting method, the moving range of the limiting module 300 can be quickly adjusted to a required range, and the adjusting precision can be ensured to be high.
Referring to fig. 1,4 and 5, the first mounting holes 130 are four and are rectangular, the second mounting holes 140 are four, two of the second mounting holes 140 are located on one side wall of the first avoidance opening 120, and the other two of the second mounting holes 140 are located on the other side wall of the first avoidance opening 120. In the above weighing device, when an overload condition occurs, at least one first bolt 410 and/or at least one second bolt 420 are/is guaranteed to contact and abut against the limiting plate 320, so as to play a role in protection.
Referring to fig. 1 and 4, according to some embodiments of the present invention, an inlet and outlet 111 is formed on a lateral surface of a base 100 in a width direction, the inlet and outlet 111 is communicated with a first avoidance opening 120 and a limiting cavity 110, the inlet and outlet 111 is used for allowing a limiting module 300 to enter and exit the limiting cavity 110, a third mounting hole 311 is formed in an up-down direction of a mounting seat 310, a third bolt is mounted in the third mounting hole 311, the third bolt is connected with a cantilever sensor 200, an avoidance hole 160 for mounting the third bolt is formed in a lower lateral wall of the limiting cavity 110, and therefore, during an assembly process, the mounting seat 310 can be firstly mounted into the limiting cavity 110 from the inlet and outlet 111, then the third bolt is mounted from the avoidance hole 160, and the mounting seat 310 is fixed at a suspension end 220 of the cantilever sensor 200.
Referring to fig. 7, when the weighing apparatus is in a loaded state, the suspension end 220 of the cantilever sensor 200 moves downward and deflects at an angle in the length direction, so that the limiting plate 320 moves downward and deflects at the same angle in the length direction of the cantilever sensor 200.
When the weighing device is erroneously pulled up, the suspended end 220 of the cantilever sensor 200 moves upward and deflects upward in the length direction, so that the end of the limiting plate 320 away from the fixed end 210 moves closer to the second bolt 420 away from the fixed end 210.
In a normal loading state of the weighing device, a vertical projection of the gravity center of a normal load falls on the cantilever sensor 200, and the cantilever end 220 of the cantilever sensor 200 is not twisted or the torsion angle can be as small as neglected in the width direction; when the weighing device is in an off-load state, i.e. the vertical projection of the center of gravity of the load is offset from the cantilever sensor 200, the cantilever sensor 200 is twisted in the width direction at the suspended end 220, see fig. 8.
Referring to the directions shown in fig. 1 and 2, the length direction of the cantilever sensor 200 is in the front-rear direction, with the suspended end 220 being at the front side of the fixed end 210, and the width direction of the cantilever sensor 200 is in the left-right direction.
Referring to fig. 1, 5 to 9, the limiting plate 320 has a first rectangle with a length a 0 and a width b 0, four first mounting holes 130 are distributed according to a second rectangle with a center being the center of the first rectangle, a 1 length and a b 1 width, the length direction of the first rectangle is along the width direction of the cantilever sensor 200, the length direction of the second rectangle is the same as the length direction of the first rectangle, wherein two second mounting holes 140 near the fixed end 210 are arranged along the length direction of the first rectangle, and two second mounting holes 140 near the fixed end 210 are in one-to-one correspondence with two first mounting holes 130 below; the maximum allowable torsion angle of the cantilever sensor 200 at the cantilever end 220 in the width direction is α 1,α1, which is the angle between the lower side of the limiting plate 320 and the horizontal plane when the maximum torsion occurs.
Wherein, when the weighing device is in a loading state, the suspension end 220 of the cantilever sensor 200 moves downwards, the actual distance between the limiting plate 320 and the first bolt 410 increases, the actual distance between the limiting plate 320 and the second bolt 420 decreases, when the suspension end 220 of the cantilever sensor 200 is pulled upwards, the actual distance between the limiting plate 320 and the first bolt 410 decreases, the actual distance between the limiting plate 320 and the second bolt 420 increases, in order to avoid the situation that the torsion angle of the suspension end 220 of the cantilever sensor 200 in the width direction is too large during the movement of the suspension end 220 of the cantilever sensor 200,
A 1 satisfies a 1≥max{2s1/tanα1,2s21/tanα1;
a 0 satisfies the following:
a0≥max{2s1/s i nα1,2s21/s i nα1}。
Therefore, when a 1、a0 satisfies the above corresponding formula, if the cantilever sensor 200 is twisted in the width direction during the loading and weighing process of the weighing device or during the process of the suspended end 220 being pulled up by mistake, the limiting module 300 will abut against the corresponding first bolt 410 and/or the corresponding second bolt 420 to form a limit before the torsion angle of the suspended end 220 of the cantilever sensor 200 in the width direction does not reach α 1, thereby ensuring that the torsion angle of the suspended end 220 of the cantilever sensor 200 in the width direction is always smaller than α 1, and further realizing torsion overload protection of the cantilever sensor 200 in the width direction in the whole process, and improving the protection function.
In a specific implementation process, the value range of a 1 may be:
max{2s1/tanα1,2s21/tanα1}～max{2s1/tanα1,2s21/tanα1}+2cm;
The value range of a 0 can be:
max{2s1/s i nα1,2s21/s i nα1}～max{2s1/s i nα1,2s21/s i nα1}+2cm.
Referring to fig. 1, 2 and 7, when the cantilever sensor 200 is under the maximum allowable load, that is, when the cantilever sensor 200 is in the maximum overload state, the center of the lower surface of the limiting plate 320 moves downwards by a distance x 1, and at this time, the included angle between the lower side surface of the limiting plate 320 and the horizontal plane, that is, the maximum allowable deflection angle of the cantilever end 220 of the cantilever sensor 200 in the length direction is α 2; when the cantilever sensor 200 is at the maximum range, at this time, the deflection angle of the suspended end 220 of the cantilever sensor 200 in the length direction, that is, the included angle between the lower side surface of the limiting plate 320 and the horizontal plane is α 3, and the distance that the center of the lower surface of the limiting plate 320 moves downward is x 0; the width b 2 of the first relief opening 120, the width b 3 of the mounting base 310, and the diameter m 1 of the first bolt. The basic parameters x 0、x1、α2、α3 can be calculated according to the specific model of the cantilever sensor 200 according to the material mechanics formula.
Wherein b 0、b1、b2 satisfies: b 1>b2>b3;
b 0 satisfies the following: (b 1-m1)/cosα2≤b0≤(b1+m1)/cosα3;
s 1 satisfies the following: x 0+b0tanα2/2≤s1≤x1+b0tanα3/2;
s 21 satisfies the following: b 0tanα2/2≤s21≤b0tanα3/2.
When b 0、b1、b2、s1、s21 satisfies the above corresponding formula, during the process of the weighing device, if the load is within the range of the weighing device, the deflection angle of the suspended end 220 of the cantilever sensor 200 in the length direction will not be greater than α 3, the first bolt 410 and the second bolt 420 will not contact the limiting plate 320, so that the weighing device can smoothly perform the weighing operation within the range of the weighing device; if the weighing device is overloaded, at least part of the first bolts 410 and/or at least part of the second bolts 420 can be guaranteed to be abutted against the limiting plate 320, so that the limiting plate 320 is limited, the conditions that the deflection angle of the cantilever end 220 of the cantilever sensor 200 in the length direction is larger than alpha 2 and the downward moving stroke is too large are avoided, and overload protection is realized.
Referring to fig. 5, in some embodiments, the four second mounting holes 140 may correspond to the four first mounting holes 130 one by one, and at this time, the four second mounting holes 140 are arranged according to a second rectangle, and a preset spacing s 22 between the upper side of the limiting plate 320 and the second bolt 420 far from the fixed end 210 is equal to a preset spacing s 21 between the upper side of the limiting plate 320 and the second bolt 420 near the fixed end 210, which may simplify the calculation of the layout of the four second mounting holes 140 and facilitate implementation. The distance that the cantilever sensor 200 can be accidentally pulled up is limited by the second bolt 420 far from the fixed end 210, and this design method cannot achieve both convenience of use and protection effect: if the distance that the cantilever sensor 200 can be accidentally pulled up is small, s 22 can be reduced, accordingly, under the limitation of the limiting module 300, the torsion angle of the suspended end 220 in the width direction is small, that is, the degree of allowing the load to be unbalanced is small, the requirement on the load loading condition is improved, and the convenience of use is reduced; conversely, when s 22 is increased to reduce the load demand, the distance that the cantilever sensor 200 can be pulled up accidentally increases, reducing the protective effect of the cantilever sensor 200 when pulled up accidentally.
Referring to fig. 6, it is conceivable that in some embodiments, the preset spacing s 22 between the upper side of the limiting plate 320 and the second bolts 420 that are far from the fixed end 210 is smaller than the preset spacing s 21 between the upper side of the limiting plate 320 and the second bolts 420 that are near the fixed end 210, and the distance between the two second bolts that are far from the fixed end is smaller than the distance between the two second bolts that are near the fixed end, so that the four second mounting holes are distributed in a trapezoid shape. With the above arrangement, s 22 is reduced, so that when the weighing device is pulled up by mistake, the end of the limiting plate away from the fixed end 210 can be contacted and abutted with the second bolt 420 away from the fixed end 210 more quickly, i.e. the distance that the suspension end 220 can be pulled up is smaller; however, reducing s 22, while causing the twistable angle of the suspension end 220 in the width direction to become smaller, simultaneously reducing the distance between the two second bolts 420 that are away from the fixed end may increase the twistable angle of the suspension end 220 in the width direction, and thus, it may be ensured that the twistable angle of the suspension end 220 in the width direction is not too small. With the above arrangement, the distance that the suspension end 220 can be pulled up by mistake is small, and meanwhile, the torsion angle of the suspension end 220 in the width direction is ensured to be suitable, so that the convenience of use and the protection effect of the limit module 300 can be considered.
Referring to fig. 6 to 8, in the embodiment, a distance between two second bolts close to the fixed end is a 1, and a distance between two second bolts far from the fixed end is a 3, wherein a 3<a1,s22<s21. S 22＝0.5s21, and accordingly a 3＝0.5a1, may be made.
In the specific implementation process, the width of the cantilever sensor 200 is b 4, the value range of the width b 3 of the mounting seat 310 can be between b 4-1cm～b4 +2cm, the value range of b 2 can be between b 3～b3 +1cm, and the value range of b 1 can be between b 2-0.5cm～b2 +4cm.
Referring to fig. 9 to 11, it is conceivable that in some embodiments, the limiting module 300 includes a first limiting member 330 and a second limiting member 340 disposed in the limiting cavity 110, the first limiting member 330 is movably mounted on the cantilever sensor 200, the second limiting member 340 is movably mounted on the cantilever sensor 200, wherein the second limiting member 340 is disposed at a lower side of the first limiting member 330, the first limiting member 330 is movable to adjust a distance between the first limiting member 330 and a lower sidewall of the limiting cavity 110, and the second limiting member 340 is movable to adjust a distance between two sidewalls of the first limiting member 330 opposite to the first avoiding opening 120, so that an adjustment of a moving range of the limiting module 300 can be achieved, so that an actual moving range of the limiting module 300 meets a use requirement. By adopting the arrangement, the movable range of the limit module 300 can be adjusted by only adjusting the upper and lower positions of the first limit part 330 and the second limit part 340, the adjusting process is simpler, the operation is convenient, the structure is simpler, and the installation is convenient.
Referring to fig. 9 to 11, according to some embodiments of the present invention, the limit module 300 includes a mounting base 310, the mounting base 310 is connected with the cantilever sensor 200, the first limit member 330 is sleeved on the mounting base 310 and is screwed with the mounting base 310, the first limit member 330 is provided with a first sleeve 331, the second limit member 340 is sleeved on the first sleeve 331 and is screwed with the first sleeve 331, by adopting the above arrangement, the size of the space between the first limit member 330 and the lower sidewall of the limit cavity 110 can be adjusted only by rotating the first limit member 330, and the size of the space between the second limit member 340 and the opposite sidewalls of the first avoiding opening 120 can be adjusted only by rotating the second limit member 340.
The thread pair between the first limiting member 330 and the mounting seat 310 is a self-locking thread pair, and the thread pair between the first limiting member 330 and the second limiting member 340 is a self-locking thread pair, so as to prevent the first limiting member 330 and the second limiting member 340 from loosening automatically.
Referring to fig. 10, 11 and 13, according to some embodiments of the present invention, a second avoidance port 150 is formed on a lower sidewall of the limiting cavity 110, the first avoidance port 120 and the second avoidance port 150 are both disposed along a length direction of the cantilever sensor 200, the base 100 is provided with an inlet and outlet 111 that is communicated with the first avoidance port 120 and the limiting cavity 110, the inlet and outlet 111 is located at one side of the first avoidance port 120 in the length direction, the inlet and outlet 111 is used for allowing the limiting module 300 to enter and exit the limiting cavity 110, a third mounting hole 311 is disposed in an up-down direction of the mounting seat 310, a third bolt capable of penetrating through the second avoidance port 150 is mounted in the third mounting hole 311, and the third bolt is connected with the cantilever sensor 200. In the assembly process, the mounting seat 310, the first limiting piece 330 and the second limiting piece 340 can be assembled together first, then the whole mounting seat is arranged in the limiting cavity 110 from the inlet and outlet 111, and then the third bolt is arranged from the second avoiding port 150, so that the mounting seat 310 is fixed on the cantilever sensor 200.
Referring to fig. 11, a portion of the first limiting member 330 and a portion of the second limiting member 340 protrude from the inlet 111, so as to facilitate rotation of the first limiting member 330 and the second limiting member 340, thereby facilitating the adjustment process.
It should be noted that, in the specific implementation process, the first limiting member 330 and the second limiting member 340 may also be installed on the installation seat 310 in other manners, for example, the first limiting member 330 is provided with a first sleeve 331, the second limiting member 340 is provided with a second sleeve 341, the first limiting member 330 is sleeved on the installation seat 310 through the first sleeve 331 in a vertically sliding manner, the second limiting member 340 is sleeved on the first limiting member 330 through the second sleeve 341 in a vertically sliding manner, a locking bolt is provided between the first sleeve 331 and the installation seat 310, the second sleeve 341 is provided with a strip-shaped hole along the vertical direction, the locking bolt penetrates through the strip-shaped hole, the head of the locking bolt is provided with a round table with a stepped shaft section, the head of the locking bolt can be abutted to the first sleeve 331 and the second sleeve 341, the end of the locking bolt is penetrated through the first sleeve 331 and abutted to the installation seat 310, in the adjusting process, the locking bolt can be loosened first, then the side wall of the first limiting member 330 and the lower limit gauge 110 can be screwed into the first limiting member 340 and the second limiting gauge 300, and the side wall of the second limiting gauge can be screwed into the first limiting gauge 120 and the second limiting gauge 300.
Referring to fig. 10, 12 to 14, according to some embodiments of the present invention, the first limiting member 330 and the second limiting member 340 are both disc-shaped, the diameter of the first limiting member 330 is d 1, the diameter of the second limiting member 340 is d 2, the preset spacing between the first limiting member 330 and the lower sidewall of the limiting cavity 110 is s 1, the preset spacing between the second limiting member 340 and the sidewall of the first avoiding opening 120 is s 2, and the maximum allowable torsion angle of the suspended end 220 of the cantilever sensor 200 in the width direction is α 1, where d 1 satisfies: d 1≥2s1/s i nα1;d2 satisfies the following: d 2≥2s2/s i nα1.
Therefore, when d 1、d2 satisfies the above corresponding formula, during the weighing process of the weighing device or the process of pulling up the suspension end 220 by mistake, if the cantilever sensor 200 is twisted in the width direction, the torsion angle of the suspension end 220 of the cantilever sensor 200 in the width direction will abut against the lower side wall of the limiting cavity 110 before α 1 is not reached, and/or the second limiting piece 340 will abut against the side wall of the first avoiding opening 120, thereby ensuring that the torsion angle of the suspension end 220 of the cantilever sensor 200 in the width direction is always smaller than α 1, and further realizing torsion overload protection of the cantilever sensor 200 in the width direction in the whole process, and improving the protection function.
Referring to fig. 11, 12 and 15, in the implementation process, the distance that the center of the lower surface of the first limiting member 330 moves downward is x 1 when the cantilever sensor 200 is under the maximum allowable load, that is, when the cantilever sensor 200 is in the maximum overload state, and the maximum allowable deflection angle of the cantilever end 220 of the cantilever sensor 200 in the length direction is α 2 (which is equivalent to the size of the included angle between the lower surface of the first limiting member 330 and the horizontal plane); when the cantilever sensor 200 is at the maximum range, the deflection angle of the cantilever end 220 of the cantilever sensor 200 in the length direction is alpha 3, and the distance that the center of the lower surface of the limiting plate 320 moves downwards is x 0; the width of the first avoidance opening 120 is b 2, the diameter of the first sleeve 331 or the second sleeve 341 is d 3, the width of the second avoidance opening 150 is b 5, and the horizontal projections of the first limiting piece 330 and the second limiting piece 340 are located in the extending range of the first avoidance opening 120 and also in the extending range of the second avoidance opening 150.
Wherein:
d 1 satisfies the following: d 1>b5/cosα1;
d 2 satisfies the following: d 2>b2/cosα1;
s 1 satisfies the following:
(d1 2-b5 2)0.5tanα2/2+x0≤s1≤(d1 2-b5 2)0.5tanα3/2+x1;
s 2 satisfies the following:
(d2 2-b2 2)0.5tanα2/2≤s2≤(d2 2-b2 2)0.5tanα3/2.
When s 1 and s 2 satisfy the corresponding formulas, if the load is within the range of the weighing device on the premise that the torsion angle of the cantilever sensor 200 in the width direction is smaller than α 1, the deflection angle of the cantilever end 220 of the cantilever sensor 200 in the length direction is not greater than α 3, the first limiting member 330 does not contact and abut against the opposite side walls of the second avoidance port 150, and the second limiting member 340 does not contact and abut against the opposite side walls of the first avoidance port 120, so that the weighing device can smoothly perform the weighing operation within the range of the weighing device; if the load exceeds the range of the weighing device, the first limiting member 330 contacts and abuts against two opposite side walls of the second avoidance port 150 and/or the second limiting member 340 contacts and abuts against two opposite side walls of the first avoidance port 120, so as to support and limit the limiting plate 320, thereby avoiding the conditions that the deflection angle of the suspended end 220 of the cantilever sensor 200 in the length direction is greater than alpha 2 and the downward movement stroke is too large, and realizing the overload protection effect.
In the specific implementation process, the value range of the cantilever sensor 200 with the width b 4,d3 may be the value range of b 4-1cm～b4+2cm,b2 and the value range of d 3+0.5cm～d3+2cm,b5 may be d 3+0.5cm～d3 +2cm, and by adopting the above arrangement, the whole size of the limiting module 300 is suitable when the design requirement is met.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (4)
1. A weighing apparatus having an overload protection function, comprising:
The base (100) is provided with a limiting cavity (110), and the limiting cavity (110) is provided with a first avoidance port (120);
The cantilever sensor (200) is positioned on the upper side of the base (100), one end of the cantilever sensor (200) is a fixed end (210) fixedly connected to the base (100), and the other end of the cantilever sensor (200) is a suspended end (220) suspended relative to the base (100);
the limiting module (300) is at least partially positioned in the limiting cavity (110), and the limiting module (300) penetrates through the first avoidance port (120) and is connected with the suspension end (220) of the cantilever sensor (200), or the suspension end (220) of the cantilever sensor (200) penetrates through the first avoidance port (120) and is connected with the limiting module (300);
The opposite side walls of the first avoidance port (120) and the lower side wall of the limiting cavity (110) can form a limiting effect on the limiting module (300), so that the upper and lower movable ranges of the suspended end (220) of the cantilever sensor (200) and the torsion angle range of the suspended end (220) of the cantilever sensor (200) in the width direction can be limited;
The limiting module (300) comprises a first limiting part (330) and a second limiting part (340) which are positioned in the limiting cavity (110), the first limiting part (330) is movably installed in the cantilever sensor (200), the second limiting part (340) is positioned at the lower side of the first limiting part (330), the first limiting part (330) is movable, the distance between the first limiting part (330) and the lower side wall of the limiting cavity (110) is adjustable, and the second limiting part (340) is movable, the distance between the first limiting part (330) and the two opposite side walls of the first avoidance opening (120) is adjustable.
2. The weighing device with overload protection function according to claim 1, wherein the limiting module (300) comprises a mounting seat (310), the mounting seat (310) is connected with the cantilever sensor (200), the first limiting piece (330) is sleeved on the mounting seat (310) and is in threaded connection with the mounting seat (310), a first sleeve (331) is arranged on the first limiting piece (330), and the second limiting piece (340) is sleeved on the first sleeve (331) and is in threaded connection with the first sleeve (331).
3. The weighing device with overload protection function according to claim 2, wherein a second avoidance port (150) is formed in the lower side wall of the limiting cavity (110), the first avoidance port (120) and the second avoidance port (150) are both arranged along the length direction of the cantilever beam sensor (200), an inlet and outlet (111) communicated with the first avoidance port (120) and the limiting cavity (110) is formed in the base (100), the inlet and outlet (111) is located at one side of the first avoidance port (120) in the length direction, and the inlet and outlet (111) is used for the limiting module (300) to enter and exit the limiting cavity (110).
4. A weighing device with overload protection according to claim 3, characterised in that a part of the first limit element (330) and a part of the second limit element (340) protrude from the inlet (111).
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| CN202310934585.3A CN116989876B (en) | 2023-07-27 | 2023-07-27 | Weighing device with overload protection function |
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Country or region after: China Address after: Building 8, Jingliang Industrial Park, No. 4 Baofu Street, Dongsheng Community, Xiaolan Town, Zhongshan City, Guangdong Province, 528400 Applicant after: Guangdong Jingliang Technology Co.,Ltd. Address before: No.36, Wanfu Road, Dongsheng Town, Zhongshan City, Guangdong Province 528400 A3 Applicant before: ZHONGSHAN JINGLIANG WEIGHING INSTRUMENT CO.,LTD. Country or region before: China |
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