Shaft pin type force sensor

Abstract

The utility model discloses a shaft pin type force sensor, and relates to the technical field of force sensors. A shaft pin type force sensor comprises a cylindrical shaft pin body, a processing module and a strain gauge, the processing module and the strain gauge are arranged in the shaft pin body, the strain gauge is attached to the inner wall of the shaft pin body, and the strain gauge is electrically connected with the processing module. The shaft pin type force sensor provided by the utility model solves the problem that the existing shaft pin type force sensor is easy to damage, prolongs the service life, and improves the use reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of force sensors, in particular to an axle pin type force sensor. Background Art

[0002] Axis pin force sensors are devices for measuring force and are widely used in the fields of agricultural equipment, weighing equipment, etc. Taking the agricultural machinery suspension device in agricultural equipment as an example, the agricultural machinery suspension device includes upper tie rods, lower tie rods, lifting rods and lifting arms, etc. Axis pin force sensors are usually set at the end of the lower tie rod to measure soil resistance during farming.

[0003] The structure of the existing axle pin type force sensor is as follows: an annular groove with a cylindrical bottom surface is set on the outer peripheral surface of the axle pin body, a strain gauge used to sense the force deformation of the axle pin body and adapted to the bottom surface of the annular groove is fixed on the bottom surface of the annular groove, and the annular groove is covered with a protective cover.

[0004] The protective cover of the pin-type force sensor of the above structure is very easy to be damaged. Once damaged, there is a risk of water entering the circuit, which in turn causes the pin-type force sensor to fail, thereby shortening the service life of the pin-type force sensor. Utility Model Content

[0005] In view of the above defects in the prior art, the utility model provides a shaft pin type force sensor, which aims to solve the problem that the existing shaft pin type force sensor is easy to be damaged.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A shaft pin type force sensor comprises a cylindrical shaft pin body, and a processing module and a strain gauge arranged in the shaft pin body. The strain gauge is attached to the inner wall of the shaft pin body, and the strain gauge is electrically connected to the processing module.

[0008] Wherein, a fixing pin is embedded in the shaft pin body, and the strain gauge is fixed between the outer wall of the fixing pin and the inner wall of the shaft pin body.

[0009] Wherein, a shear ring groove corresponding to the strain gauge is arranged on the outer wall of the shaft pin body.

[0010] There are two strain gauges arranged at intervals, and correspondingly, there are two shear ring grooves arranged at intervals.

[0011] Wherein, a connector is arranged on the shaft pin body, and the communication line of the processing module passes through the connector.

[0012] Wherein, sealing structures are provided at both ends of the shaft pin body, and the sealing structures include a sealing plug and a sealing ring. The sealing plug is sealed in the shaft pin body, and the sealing ring is provided between the sealing plug and the inner wall of the shaft pin body.

[0013] Wherein, both ends of the axle pin body are respectively provided with mounting holes coaxial with the axle pin body, and the mounting holes and the inner hole of the axle pin body form a step hole, and the sealing plug includes a head and a plunger part arranged on the head, and the plunger part extends into the inner hole of the axle pin body, and the head rests on the step of the step hole; a sealing groove is arranged on the plunger part, and the sealing ring is installed in the sealing groove.

[0014] Wherein, the sealing structure further comprises an elastic retaining ring, a mounting groove is arranged on the hole wall of the mounting hole, the elastic retaining ring is mounted in the mounting groove, and the head is limited between the elastic retaining ring and the step.

[0015] Wherein, the axle pin body is provided with an installation positioning structure.

[0016] Wherein, the installation positioning structure includes a plurality of positioning grooves, and all the positioning grooves are arranged in a circular array with the axis of the axle pin body as the central axis.

[0017] By adopting the above technical solution, the beneficial effects of the utility model are:

[0018] The shaft pin type force sensor provided by the utility model has a strain gauge attached to the inner wall of the shaft pin body. Therefore, there is no need to open an annular groove on the outer wall of the shaft pin body and add a protective cover, and the problem of easy damage of the protective cover does not exist, thus solving the problem of easy damage of the shaft pin type force sensor. In addition, the shaft pin type force sensor provided by the utility model improves its structure so that its overall force is more uniform, avoids structural mutations, reduces stress concentration, reduces the risk of damage and fracture, prolongs its service life, and improves its reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the shaft pin type force sensor of the utility model;

[0020] Figure 2 yes Figure 1 A cross-sectional view of the center axle pin body;

[0021] In the figure: 1, shaft pin body; 11, shear ring groove; 12, mounting hole; 13, positioning groove; 2, strain gauge; 3, connector; 4, communication line; 5, sealing plug; 51, head; 52, plunger part; 6, sealing ring; 7, elastic retaining ring. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] like Figure 1 and Figure 2 As shown, this embodiment discloses a pin-type force sensor, including a cylindrical pin body 1, and a processing module (not shown in the figure) and a strain gauge 2 arranged in the pin body 1. The strain gauge 2 is fixed to the inner wall of the pin body 1 by a colloid, and the strain gauge 2 is electrically connected to the processing module through a signal transmission line.

[0024] In the pin-type force sensor of the present embodiment, since the strain gauge 2 is attached to the inner wall of the pin body 1, there is no need to open an annular groove on the outer wall of the pin body 1 or to add a protective cover, and the problem of easy damage of the protective cover does not exist, thus solving the problem of easy damage of the pin-type force sensor; moreover, the pin-type force sensor of the present embodiment improves its structure so that its overall force is more uniform, avoids structural mutations, reduces stress concentration, reduces the risk of damage and fracture, extends its service life, and improves its reliability.

[0025] The strain gauge 2 in this embodiment is in an arc shape that matches the inner wall surface of the shaft pin body 1 . During installation, the strain gauge 2 is pasted and pressure-maintained to the inner wall of the shaft pin body 1 using a pressure-maintaining tool.

[0026] In order to prevent the strain gauge 2 from falling off and improve the stability of the strain gauge 2, in some embodiments, a fixing pin (not shown in the figure) having an interference fit with the shaft pin body 1 is nested in the shaft pin body 1, and the strain gauge 2 is fixed between the outer wall of the fixing pin and the inner wall of the shaft pin body 1. During the specific installation, the strain gauge 2 is first pasted to the outer wall of the fixing pin, and then the fixing pin with the strain gauge 2 is nested in the shaft pin body 1.

[0027] In this embodiment, a shear ring groove 11 corresponding to the strain gauge 2 is provided on the outer wall of the shaft pin body 1. When the shaft pin body 1 is subjected to external load, the shear ring groove 11 can more easily transfer shear deformation to the strain gauge 2.

[0028] Specifically, the bottom wall of the shear ring groove 11 is connected to the outer wall of the shaft pin body 1 through an inclined transition. Such an arrangement avoids structural mutations, reduces stress concentration, and reduces the risk of fracture.

[0029] In the present embodiment, two strain gauges 2 are arranged at intervals, and correspondingly, two shear ring grooves 11 are also arranged at intervals. In practical applications, the number of strain gauges 2 and shear ring grooves 11 is not limited, and can be designed according to actual needs.

[0030] In this embodiment, the shaft pin body 1 is provided with a connector 3, and the communication line 4 of the processing module passes through the connector 3. Such a configuration facilitates the electrical connection between the processing module and the control unit of the complete device.

[0031] Specifically, the processing module and the signal transmission line between the strain gauge 2 and the processing module are fixed and adhered to the shaft pin body 1 through colloid. The shaft pin body 1 is provided with a connecting hole connected to the inner hole of the shaft pin body 1. One end of the plug 3 is arranged in the connecting hole. The communication line 4 of the processing module passes through the inner cavity of the plug 3 to facilitate connection with the control unit of the whole machine.

[0032] In order to protect the processing module, the strain gauge 2 and the signal transmission line located inside the shaft pin body 1 from the influence of the external environment, sealing structures are provided at both ends of the shaft pin body 1 in this embodiment.

[0033] The sealing structure in this embodiment includes a sealing plug 5 and a sealing ring 6 . The sealing plug 5 is sealed in the shaft pin body 1 , and the sealing ring 6 is arranged between the sealing plug 5 and the inner wall of the shaft pin body 1 .

[0034] Specifically, both ends of the axle pin body 1 are respectively provided with mounting holes 12 coaxial with the axle pin body 1, and the mounting hole 12 and the inner hole of the axle pin body 1 form a step hole. The sealing plug 5 includes a head 51 and a plunger portion 52 arranged on the head 51, the plunger portion 52 extends into the inner hole of the axle pin body 1, and the head 51 abuts against the step of the step hole; a sealing groove is provided on the plunger portion 52, and the sealing ring 6 is installed in the sealing groove.

[0035] In order to prevent the sealing plug 5 from falling off and improve the stability of the sealing plug 5, the sealing structure in this embodiment also includes an elastic retaining ring 7. A mounting groove is provided on the hole wall of the mounting hole 12. The elastic retaining ring 7 is installed in the mounting groove. The head 51 of the sealing plug 5 is limited between the elastic retaining ring 7 and the step.

[0036] In order to facilitate the installation of the pin-type force sensor, an installation positioning structure is further provided on the pin body 1 in this embodiment. The installation positioning structure includes a plurality of positioning grooves 13 . All positioning grooves 13 are arranged in a circular array with the axis of the pin body 1 as the central axis.

[0037] Specifically, the installation and positioning structure in this embodiment includes four positioning grooves 13 .

[0038] The structure of the axle pin type force sensor of the utility model is introduced in detail above. In summary, the axle pin type force sensor of the utility model not only solves the problem of easy breakage of the existing axle pin type force sensor by improving the structure, but also makes the overall force more uniform, avoids structural mutation, reduces stress concentration, reduces the risk of breakage and fracture, prolongs the service life, and improves the reliability of use.

[0039] The present utility model is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative labor are all within the protection scope of the present utility model.

Claims

1. A pin-type force sensor, characterized in that: It comprises a cylindrical shaft pin body, and a processing module and a strain gauge arranged in the shaft pin body, wherein the strain gauge is attached to the inner wall of the shaft pin body, and the strain gauge is electrically connected to the processing module; A fixing pin is embedded in the shaft pin body, and the strain gauge is fixed between the outer wall of the fixing pin and the inner wall of the shaft pin body.

2. The pin-type force sensor according to claim 1, characterized in that: The outer wall of the shaft pin body is provided with a shear ring groove corresponding to the strain gauge.

3. The pin-type force sensor according to claim 2, characterized in that: The strain gauges are arranged in two at intervals, and correspondingly, the shear ring grooves are also arranged in two at intervals.

4. The pin-type force sensor according to claim 1, characterized in that: The shaft pin body is provided with a connector, and the communication line of the processing module passes through the connector.

5. The pin-type force sensor according to claim 1, characterized in that: Both ends of the shaft pin body are provided with sealing structures, and the sealing structures include a sealing plug and a sealing ring. The sealing plug is sealed in the shaft pin body, and the sealing ring is arranged between the sealing plug and the inner wall of the shaft pin body.

6. The pin-type force sensor according to claim 5, characterized in that: Both ends of the axle pin body are respectively provided with mounting holes coaxial with the axle pin body, and the mounting holes and the inner hole of the axle pin body form a step hole. The sealing plug includes a head and a plunger portion arranged on the head, the plunger portion extends into the inner hole of the axle pin body, and the head abuts against the step of the step hole; a sealing groove is arranged on the plunger portion, and the sealing ring is installed in the sealing groove.

7. The pin-type force sensor according to claim 6, characterized in that: The sealing structure further comprises an elastic retaining ring, a mounting groove is arranged on the hole wall of the mounting hole, the elastic retaining ring is mounted in the mounting groove, and the head is limited between the elastic retaining ring and the step.

8. The pin-type force sensor according to claim 1, characterized in that: The shaft pin body is provided with an installation and positioning structure.

9. The pin-type force sensor according to claim 8, characterized in that: The installation positioning structure comprises a plurality of positioning grooves, and all the positioning grooves are arranged in a circular array with the axis of the axle pin body as the central axis.

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