Locking structure for a load cell and load cell

Abstract

The application provides a locking structure for a load sensor and a load sensor, and relates to the technical field of sensors. The locking structure for the load sensor comprises an adjustable part and a locking part. The adjustable part is a hollow cavity provided with an opening. A load adjusting part of the load sensor is arranged in the hollow cavity and abuts against one end of a load bearing part in a housing of the load sensor and exerts a pre-tightening force on the load bearing part. The hollow cavity comprises a connecting cavity and an adjusting cavity. The connecting cavity is arranged at one end of the hollow cavity close to the load bearing part. The adjusting cavity is arranged at the other end of the hollow cavity away from the load bearing part. The adjusting cavity can be tightened towards the direction close to the load adjusting part relative to the connecting cavity. The locking part is arranged on the outer wall of the hollow cavity through the connecting cavity and tightens the adjusting cavity by exerting a force on the outer wall of the adjusting cavity, thereby solving the problem of unstable pre-tightening force on the elastic part.

Description

Technical Field

[0001] This application relates to the field of sensor technology, specifically to a locking structure for a weighing sensor and a weighing sensor. Background Technology

[0002] A load cell is a device that converts a mass signal into a measurable electrical signal output. There are various types of load cells, among which strain gauge load cells measure weight by utilizing the principle that the resistance of a strain gauge changes as it deforms. When using preload to implement the tare and zeroing function of a load cell, the magnitude of the preload is unstable and easily affected by external vibrations or other factors, leading to inaccurate tare and zeroing, and consequently affecting the measurement accuracy of the load cell. Summary of the Invention

[0003] In view of this, embodiments of this application provide a locking structure for a weighing sensor and a weighing sensor, which can solve the above-mentioned technical problems.

[0004] In a first aspect, this application provides a locking structure for a weighing sensor, which includes an adjustable member and a locking member. The adjustable member is a hollow cavity with an opening. A load adjustment member of the weighing sensor passes through the hollow cavity and abuts against one end of a load carrier member inside the housing of the weighing sensor, applying a preload force to the load carrier member. The hollow cavity includes a connecting cavity and an adjusting cavity. The connecting cavity is located at one end of the hollow cavity near the load carrier member, and the adjusting cavity is located at the other end of the hollow cavity away from the load carrier member. The adjusting cavity can be tightened relative to the connecting cavity towards the load adjustment member. The locking member is disposed on the outer wall of the hollow cavity through the connecting cavity and tightens the adjusting cavity by applying force to the outer wall of the adjusting cavity.

[0005] In one embodiment, the inner wall surface of the connecting cavity and the inner wall surface of the adjusting cavity are on the same plane, and the outer wall surface of the adjusting cavity is inclined relative to the outer wall surface of the connecting cavity towards the center of the hollow cavity, forming a first included angle α with the plane containing the outer wall surface of the connecting cavity, and 0° < α < 90°.

[0006] In one embodiment, the range of the first included angle α is 0° < α ≤ 10°.

[0007] In one embodiment, the locking member comprises a connecting portion and a pressing portion, the connecting portion is adapted to the shape of the connecting cavity and can be sleeved on the outer wall of the connecting cavity, the first displacement adjustment structure is arranged on the wall surface of the connecting portion facing the outer wall of the connecting cavity; the second displacement adjustment structure is correspondingly arranged on the outer wall of the connecting cavity, the first displacement adjustment structure and the second displacement adjustment structure cooperate to adjust the displacement of the locking member relative to the adjustable member; the pressing portion is adapted to the shape of the adjusting cavity and can be sleeved on the outer wall of the adjusting cavity, and the wall surface of the pressing portion facing the outer wall of the adjusting cavity is in contact with the outer wall of the adjusting cavity, wherein when the locking member moves relative to the adjustable member in the direction towards the load bearing member, the pressing portion applies an external force to the adjusting cavity to compress the inner wall of the adjusting cavity against the surface of the load adjusting member.

[0008] In one embodiment, the wall surface of the pressing portion facing the outer wall of the adjusting cavity and the wall surface of the connecting portion facing the outer wall of the connecting cavity form a second included angle β, and β≥α.

[0009] In one embodiment, the hollow cavity is cylindrical, the first displacement adjustment structure is a first thread arranged circumferentially on the wall surface of the pressing portion facing the outer wall of the adjusting cavity, and the second displacement adjustment structure is a second thread arranged circumferentially on the outer wall of the connecting cavity.

[0010] In one embodiment, one or more fine grooves are arranged on the adjustable member in the direction from the adjusting cavity to the connecting cavity, the fine grooves are in communication with the inner wall of the hollow cavity and the outer wall of the hollow cavity, the end of the fine grooves away from the adjusting cavity is closed, and the end of the fine grooves away from the connecting cavity is open.

[0011] In one embodiment, the length of the fine grooves on the connecting cavity is less than the length of the second thread on the connecting cavity.

[0012] In one embodiment, the wall surface of the locking member away from the outer wall of the hollow cavity is configured as a hexagonal surface.

[0013] In a second aspect, the present application further provides a load sensor, comprising a housing, a pull shaft, an elastic sheet, a load bearing member, a load adjusting member, and the locking structure for the load sensor described in any one of the above embodiments, wherein the housing is a hollow cavity provided with a first opening; one end of the pull shaft is a free end, and the other end of the pull shaft is a connecting end, wherein the connecting end is arranged in the hollow cavity, the free end extends out of the first opening and protrudes from the housing, and the pull shaft can move axially relative to the hollow cavity; the elastic sheet is arranged in the hollow cavity and can be deformed with the movement of the pull shaft; the load bearing member is arranged in the hollow cavity and located between the free end and the connecting end, and under the action of an external force applied at the free end, the load bearing member is compressed under stress, while the pull shaft moves and drives the elastic sheet to deform; the load adjusting member is arranged at the first opening and sleeved on the outer periphery of the pull shaft, and cooperates with the housing to adjust the size of the pre-tightening force applied on the load bearing member.

[0014] According to the technical scheme of the present application, the inner diameter of the adjusting cavity is adjusted by the locking member, so that the inner wall of the adjusting cavity further presses the load adjusting member arranged in the adjusting cavity, which avoids the movement of the load adjusting member relative to the adjustable member under vibration and the like, improves the stability of the pre-tightening force on the load bearing member, and solves the problem of instability of the pre-tightening force on the load bearing member with elasticity. Meanwhile, since the load bearing member is used as the main force receiving component, the service life of the elastic sheet is improved, and the problem of the influence of the creep of the elastic sheet on the service life and the measurement accuracy of the load cell is solved by making the thick elastic body thin. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a sectional view of a locking structure for a load cell according to an embodiment of the present application.

[0016] Figure 2 Fig. 2 is a partial structure schematic view of the locking structure for the load cell according to the embodiment of the present application.

[0017] Figure 3 Fig. 3 is a structure schematic view of the load cell according to the embodiment of the present application.

[0018] Figure 4 Fig. 4 is a sectional view of the load cell according to the embodiment of the present application.

[0019] 1-adjustable member; 11-adjusting cavity; 12-connection cavity; 2-locking member; 21-connection part; 22-pressing part; 3-load adjusting member; 4-load bearing member; 5-fine groove; 6-housing; 7-pull shaft; 71-free end; 72-connection end; 8-elastic sheet. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0021] The load cell mainly includes a housing, a pull shaft, and an elastic sheet with a strain sheet mounted thereon. One end of the pull shaft is connected with the elastic sheet, and the other end is used to connect a load to be weighed. One end of the elastic sheet is connected with the housing, and the other end is connected with the pull shaft. When the load is connected to the pull shaft, the pull shaft drives the elastic sheet to deform, so that the weight of the load can be obtained according to the change of the resistance measured by the strain sheet on the elastic sheet. Since the elastic sheet is the force receiving element mainly bearing the external force on the pull shaft in the load cell, the elastic sheet needs a certain thickness to ensure the rigidity requirement, and the thick elastic sheet will produce creep after long time use, thereby affecting the service life and the accuracy of the load cell.

[0022] In order to improve the service life and measurement accuracy of the weighing sensor, a load bearing member with elasticity can be arranged in the shell of the weighing sensor to replace the elastic body under stress, and a load adjusting member is arranged on the inner wall of the hollow cavity to apply a pre-tightening force to the load bearing member. However, due to vibration and other reasons, relative movement may occur between the load adjusting member and the hollow cavity, which changes the pre-tightening force on the load bearing member. Based on this, the embodiment of the present application provides a locking structure for the weighing sensor, which can improve the stability of the pre-tightening force applied to the load bearing member.

[0023] Figure 1 The cross-sectional view of the locking structure for the weighing sensor provided by the embodiment of the present application is shown. Figure 2 The partial structure schematic diagram of the locking structure for the weighing sensor provided by the embodiment of the present application is shown.

[0024] The locking structure includes an adjustable member 1 and a locking member 2. The adjustable member 1 is a hollow cavity with an opening, and the load adjusting member 3 of the weighing sensor is arranged in the hollow cavity and abuts against one end of the load bearing member 4 in the shell of the weighing sensor to apply a pre-tightening force to the load bearing member 4. The hollow cavity includes a connecting cavity 12 and an adjusting cavity 11, wherein the connecting cavity 12 is arranged at one end of the hollow cavity close to the load bearing member 4, the adjusting cavity 11 is arranged at the other end of the hollow cavity away from the load bearing member 4, and the adjusting cavity 11 can be tightened relative to the connecting cavity 12 in the direction close to the load adjusting member 3. The locking member 2 is arranged on the outer wall of the hollow cavity through the connecting cavity 12, and the adjusting cavity 11 is tightened by applying a force to the outer wall of the adjusting cavity 11.

[0025] Specifically, when the load adjusting member 3 is arranged in the hollow cavity, the outer surface of the load adjusting member 3 is in contact with the inner wall of the hollow cavity, i.e. the connecting cavity 12 and the adjusting cavity 11, and the two are fixed together by clamping or threaded connection and other methods. At the same time, the load adjusting member 3 is deeply arranged in the hollow cavity and the end face close to the connecting cavity 12 abuts against one end of the load bearing member 4 arranged in the hollow cavity, and can apply a pre-tightening force to the load bearing member 4.

[0026] The locking member 2 tightens the adjusting cavity 11 of the hollow cavity, so that the inner wall of the adjusting cavity 11 further extrudes the outer surface of the load adjusting member 3, increases the friction between the adjusting cavity and the load adjusting member, so that relative movement is not easy to occur between the two under vibration and other conditions, and finally improves the stability of the connection between the two, that is, improves the stability of the pre-tightening force applied by the load adjusting member 3 to the load bearing member 4.

[0027] According to the embodiment of the present application, the inner diameter of the adjusting cavity 11 is adjusted by the locking member 2, so that the inner wall of the adjusting cavity 11 further presses the load adjusting member 3 arranged in the adjusting cavity 11, which avoids the movement of the load adjusting member 3 relative to the adjustable member 1 under vibration or the like, and improves the stability of the pre-tightening force on the load bearing member 4, and solves the problem of unstable pre-tightening force on the elastic part.

[0028] In one embodiment, the inner wall surface of the connecting cavity 12 and the inner wall surface of the adjusting cavity 11 are on the same plane, and the outer wall surface of the adjusting cavity 11 is inclined to the center of the hollow cavity relative to the outer wall surface of the connecting cavity 12 to form a first included angle a with the plane where the outer wall surface of the connecting cavity 12 is located, and 0°<a<90°.

[0029] By inclining the outer wall surface of the adjusting cavity 11 to the direction of being pressed, a force contact surface is formed, which facilitates the locking member 2 to apply an external force to the adjusting cavity 11 to make it tighten. At the same time, the inner wall surface of the adjusting cavity 11 and the inner wall surface of the connecting cavity 12 form an included angle, which not only facilitates the adjustable member 1 to fix the load adjusting member 3 by the inner wall surfaces of the adjustable cavity 11 and the connecting cavity 12, but also facilitates the inner wall surface connected to the outer wall surface of the adjustable cavity and arranged oppositely to be further pressed against the outer surface of the load adjusting member 3 by the force of the locking member 2, which is a clever design and has a simple machining process, and is convenient for production and assembly.

[0030] In another embodiment, the first included angle a is in the range of 0°<a≤10°. From the performance considerations of part machining, part service life, and the limiting effect of the part on the load adjusting member 3 during use, and the locking effect achieved by cooperating with the locking member 2, this design scheme can balance the performance of the three aspects. Specifically, the first included angle a can be about 8°.

[0031] It can be understood that the above embodiment only gives a scheme in which the locking member 2 can achieve the locking effect on the adjustable member 1, but is not limited to the above scheme, and other schemes can also be used, for example, based on the fact that the adjustable member 1 itself has a certain contraction ability, the locking member 2 is wrapped on the outer wall of the adjustable member 1 to form a plurality of locking blades, and the gap between the locking blades relative to the locking member 2 can be adjusted, and the adjustment of the gap between the locking blades can also achieve the tightening of the adjusting cavity of the adjustable member 1.

[0032] In one embodiment, the locking piece 2 comprises a connecting portion 21 and a pressing portion 22, the connecting portion 21 is adapted to the shape of the connecting cavity 12 and can be sleeved on the outer wall of the connecting cavity 12, the first displacement adjustment structure is arranged on the wall surface of the outer wall of the connecting cavity 12; the second displacement adjustment structure is correspondingly arranged on the outer wall of the connecting cavity 12, the first displacement adjustment structure and the second displacement adjustment structure cooperate to adjust the displacement of the locking piece 2 relative to the adjustable piece 1; the pressing portion 22 is adapted to the shape of the adjusting cavity 11 and can be sleeved on the outer wall of the adjusting cavity 11, and the wall surface of the outer wall of the adjusting cavity 11 is in contact with the outer wall of the adjusting cavity 11, when the locking piece 2 moves relative to the adjustable piece 1 towards the load bearing piece 4, the pressing portion 22 applies an external force to the adjusting cavity 11 to press the inner wall of the adjusting cavity 11 against the surface of the load adjusting piece 3. The structure of the locking piece 2 is simple and convenient for processing and assembly, which improves the production and assembly efficiency.

[0033] In one embodiment, the wall surface of the pressing portion towards the outer wall of the adjusting cavity and the wall surface of the connecting portion towards the outer wall of the connecting cavity form a second included angle β, and β≥α. The wall surface of the pressing portion is used as a force applying structure without additional design, which saves production cost and improves production efficiency.

[0034] In one embodiment, the second included angle β is equal to the first included angle α, so that the inner wall of the pressing portion 22 is attached to the outer wall of the adjusting cavity 11, which plays a guiding role on one hand, and facilitates the relative movement between the locking piece 2 and the adjustable piece 1, and on the other hand, the force receiving area between the pressing portion 22 and the adjustable piece 1 is maximized, which improves the working efficiency of the tightened adjustable piece 1.

[0035] The structure of the locking piece 2 cooperates with the structure of the adjusting cavity 11 in the above-mentioned scheme, especially the design of the included angle between the outer walls of the adjusting cavity and the connecting cavity included in the adjustable piece 1, so that when the locking piece 2 is sleeved on the outer wall of the adjustable piece 1, the first displacement adjustment structure on the connecting portion 21 and the second displacement adjustment structure on the outer wall of the connecting cavity 12 make the locking piece 2 move relative to the adjustable piece 1. Since the inner wall surface of the pressing portion 22 and the outer wall surface of the adjusting cavity 11 are partially or completely attached together, during the movement, the pressing portion 22 will be subjected to a pulling force in the downward direction due to the downward movement of the connecting portion 21 relative to the pressing portion 22, and an inward force will be applied to the outer wall of the adjusting cavity 11, thereby realizing the tightening of the adjusting cavity 11. It can be understood that when the connecting portion 21 moves upward, i.e. moves towards the pressing portion 22, until it is separated from the connecting cavity 12 of the adjustable piece 1, the pressure applied by the pressing portion 22 to the wall surface of the adjusting cavity 11 will disappear, and the tightening of the adjusting cavity 11 will be released.

[0036] The pressing part 22 of the locking member 2 is not limited to the above-mentioned scheme, as long as the inner wall of the pressing part 22 is provided with a force applying structure to apply an external force to the outer wall of the adjusting cavity 11 during the movement of the connecting part 21. The force applying structure can be one or more protruding structures or other structures.

[0037] In an embodiment, the hollow cavity is cylindrical, the first displacement adjusting structure is a first thread circumferentially arranged on the wall surface of the pressing part 22 facing the outer wall of the adjusting cavity 11, and the second displacement adjusting structure is a second thread circumferentially arranged on the outer wall of the connecting cavity 12. The section of the wall surface of the adjusting cavity 11 is a conical structure, and the section of the outer wall of the connecting cavity 12 is cylindrical. The use of the threaded connection facilitates the locking operation of the locking member 2 on the adjusting cavity 11 of the adjustable member 1, and the production process of the thread is mature and simple, thereby saving production costs.

[0038] In an embodiment, one or more fine grooves 5 are arranged on the adjustable member 1 in the direction from the adjusting cavity 11 to the connecting cavity 12, the fine grooves 5 are closed at the end away from the adjusting cavity 11 and open at the end away from the connecting cavity 12. The arrangement of the fine grooves 5 facilitates the locking of the adjusting cavity 11 and improves the service life of the adjustable member.

[0039] In an embodiment, a plurality of fine grooves 5 are arranged on the adjustable member 1, and the plurality of fine grooves 5 are uniformly distributed on the peripheral wall of the adjusting cavity 11. This arrangement does not affect the strength of the adjustable member 1, reduces the difficulty of the contraction of the adjusting cavity 11, and improves the working efficiency.

[0040] In an embodiment, the length of the fine groove 5 on the connecting cavity 12 is less than the length of the second thread on the connecting cavity 12. The opening of the fine groove 5 on the connecting cavity 12 facilitates the contraction of the adjusting cavity 11, while maintaining the integrity of part of the second thread on the connecting cavity 12, thereby improving the smoothness of the connection between the locking member 2 and the connecting part 21, and further improving the efficiency of the cooperation between the parts.

[0041] In an embodiment, the wall surface of the locking member 2 away from the outer wall of the hollow cavity is configured as a hexagonal surface. It can be understood that when the hollow cavity is cylindrical, the connecting part 21 of the locking member 2 that cooperates with it is also a circular ring structure with a cylindrical cavity, and the pressing part 22 is a ring structure with a conical inner wall section. Configuring the outer wall surfaces of the pressing part 22 and the connecting part 21 as hexagonal surfaces facilitates the operation of the staff and improves the working efficiency. It can be understood that the configuration of the outer surface of the locking member 2 as a hexagonal surface is designed with reference to a hexagonal nut, so that the operator can use common tools to operate the locking member 2. Of course, the outer wall of the locking member 2 can also be configured as other structures, such as a pentagonal surface, a quadrangular surface, or a thread circumferentially arranged on the outer wall.

[0042] Figure 3 Fig. 1 is a structural schematic diagram of a load cell according to an embodiment of the present application. Figure 4 Fig. 2 is a sectional view of the load cell according to an embodiment of the present application.

[0043] The load cell comprises the locking structure for the load cell in the above-mentioned embodiments, which will not be described in detail.

[0044] The load cell according to the above-mentioned scheme further comprises a shell 6, a pull shaft 7, an elastic sheet 8, a load bearing 4 and a load adjusting member 3, wherein the shell 6 is a hollow cavity provided with a first opening; the pull shaft 7 comprises a free end 71 and a connecting end 72 connected together, wherein the connecting end 72 is arranged in the hollow cavity, the free end 71 extends out of the first opening and protrudes from the shell 6, and the pull shaft is capable of moving along the axial direction relative to the hollow cavity; the elastic sheet 8 is arranged in the hollow cavity and is capable of deforming along with the movement of the pull shaft 7; the load bearing 4 is arranged in the hollow cavity and located between the free end 71 and the connecting end 72, under the effective force of the external force applied to the free end 71, the load bearing 4 is compressed under stress, and at the same time, the pull shaft 7 moves and drives the elastic sheet to deform; wherein the effective force is the component force of the external force in the direction parallel to the extending direction of the pull shaft 7; the load adjusting member 3 is arranged at the first opening and sleeved on the outer periphery of the pull shaft 7, and cooperates with the shell 6 to adjust the size of the pre-tightening force applied to the load bearing 4.

[0045] Wherein, the load adjusting member 1 and the shell 6 of the load cell can be a split structure or an integral structure, which can be selected according to the specific production conditions and requirements, thereby improving the adaptability of the locking structure for the load cell. Moreover, the load bearing as the main stress component avoids the direct stress on the elastic sheet, thereby reducing the influence on the service life of the elastic sheet and the measurement accuracy of the load cell.

[0046] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above-mentioned terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0048] In addition, the terms "first", "second", etc. are used herein only to describe various conditions, and are not to be construed as indicating relative importance or a number of the technical features indicated thereby, such that the features limited by "first", "second" can include at least one of the features, explicitly or implicitly.

[0049] The preferred embodiments of the present application are described above in detail. The above description, however, is not to be considered to be limited to the preferred embodiments. All changes and modifications that come within the spirit and scope of the present application will be considered as falling within the scope of the present application.

Claims

1. A locking structure for a weighing sensor, characterized in that, include: An adjustable component is a hollow cavity with an opening. The load adjustment component of the load cell passes through the hollow cavity and abuts against one end of the load bearing component inside the housing of the load cell, applying a preload force to the load bearing component. The hollow cavity includes a connecting cavity and an adjusting cavity. The connecting cavity is located at one end of the hollow cavity near the load bearing component, and the adjusting cavity is located at the other end of the hollow cavity away from the load bearing component. The adjusting cavity can be tightened relative to the connecting cavity towards the load adjustment component. A locking element is disposed on the outer wall of the hollow cavity through the connecting cavity, and the adjusting cavity is tightened by applying force to the outer wall of the adjusting cavity to adjust the inner diameter of the adjusting cavity, so that the inner wall of the adjusting cavity presses against the load adjusting element disposed in the adjusting cavity; Wherein, the inner wall surface of the connecting cavity and the inner wall surface of the adjusting cavity are on the same plane, and the outer wall surface of the adjusting cavity is inclined relative to the outer wall surface of the connecting cavity towards the center of the hollow cavity, forming a first included angle α with the plane where the outer wall surface of the connecting cavity is located, and 0° < α < 90°.

2. The locking structure according to claim 1, characterized in that, The first included angle α is in the range of 0°<α≤10°.

3. The locking structure according to claim 1, characterized in that, The locking element includes: The connecting part is adapted to the shape of the connecting cavity and can be sleeved on the outer wall of the connecting cavity. The connecting part has a first displacement adjustment structure on the wall surface facing the outer wall of the connecting cavity. The outer wall of the connecting cavity has a corresponding second displacement adjustment structure. The first displacement adjustment structure and the second displacement adjustment structure cooperate to adjust the displacement of the locking member relative to the adjustable member. The clamping part is adapted to the shape of the adjusting cavity and can be sleeved on the outer wall of the adjusting cavity, and the wall surface of the clamping part facing the outer wall of the adjusting cavity is in contact with the outer wall of the adjusting cavity. When the locking member moves relative to the adjustable member toward the load-bearing member, the pressing part applies an external force to the adjusting cavity, causing the inner wall of the adjusting cavity to press against the surface of the load adjusting member.

4. The locking structure according to claim 3, characterized in that, The wall surface of the pressing part facing the outer wall of the adjusting cavity and the wall surface of the connecting part facing the outer wall of the connecting cavity form a second included angle β, and β≥α.

5. The locking structure according to claim 3, characterized in that, The hollow cavity is cylindrical, the first displacement adjustment structure is a first thread circumferentially provided on the wall surface of the pressing part facing the outer wall of the adjustment cavity, and the second displacement adjustment structure is a second thread circumferentially provided on the outer wall of the connecting cavity.

6. The locking structure according to claim 5, characterized in that, In the direction from the adjusting cavity to the connecting cavity, the adjustable member has one or more fine grooves that connect the inner wall of the hollow cavity and the outer wall of the hollow cavity. The end of the fine groove away from the adjusting cavity is closed, and the end away from the connecting cavity is open.

7. The locking structure according to claim 6, characterized in that, The length of the groove on the connecting cavity is less than the length of the second thread on the connecting cavity.

8. The locking structure according to any one of claims 1-7, characterized in that, The locking member is configured with a hexagonal face on the outer wall surface away from the hollow cavity.

9. A weighing sensor, characterized in that, include: The shell is a hollow cavity with a first opening; A pull shaft, one end of which is a free end and the other end of which is a connecting end, wherein the connecting end is disposed in the hollow cavity, the free end extends out of the first opening and protrudes from the housing, and the pull shaft can move axially relative to the hollow cavity; An elastic sheet is disposed within the hollow cavity and can deform as the pull shaft moves; A load-bearing component is disposed in the hollow cavity and located between the free end and the connecting end. Under the action of an external force applied to the free end, the load-bearing component is compressed, and at the same time, the pull shaft moves and drives the elastic sheet to move and deform. A load adjustment component is disposed at the first opening and sleeved on the outer periphery of the pull shaft, and cooperates with the housing to adjust the magnitude of the preload applied to the load-bearing component. The locking structure for a weighing sensor according to any one of claims 1-8.

Images