A torque sensor calibration method and device

Abstract

The present invention relates to the technical field of torque sensor calibration, and specifically discloses a torque sensor calibration method and device. The torque sensor calibration method includes: S10: Fix the frame; S20: Install the torque sensor to be calibrated; S30: Install a disc-shaped lever; S40: Adjust the disc-shaped lever to a vertical state and obtain the inclination angle θ of the axial direction of the torque sensor to be calibrated relative to the horizontal direction; S50: Load standard weights, and the torque value T1 is displayed on the PLC controller; S60: Calculate the standard torque value T; S70: Obtain the torque indication error of the torque sensor to be calibrated by comparing T1 and T, and then calibrate the torque sensor through the PLC controller. In the case where the torque input end of the torque sensor to be calibrated is worn, the above calibration method can correct the applied standard torque, thereby eliminating the error caused by wear and greatly improving the calibration accuracy of the torque sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of torque sensor calibration, and in particular to a torque sensor calibration method and device. Background Art

[0002] Torque sensor is also called torque sensor, torque sensor, torque sensor, torque meter, which is divided into two categories: dynamic and static. Dynamic torque sensor can also be called torque sensor, torque speed sensor, non-contact torque sensor, rotational torque sensor, etc. Torque sensor is a detection of torsional torque perception on various rotating or non-rotating mechanical parts.

[0003] The traditional torque sensor calibration device applies a known torsional force to its torsion shaft, and then observes the value on the torque sensor to determine whether it is calibrated. For example, the utility model patent with publication number CN216669114U proposes a torque sensor calibration device, which specifically includes structures such as a mounting plate, a clamping device, a force arm, and a loading device. In the specific implementation process of this patented technical solution, a weight of known weight in the loading device is used to provide power, thereby applying a force to the torsion shaft of the torque sensor to determine the detection error of the torque sensor.

[0004] However, in the specific implementation of the technical solution of the above patent, the lever arm and the torque sensor are connected by a rubber sleeve, which has a certain elasticity. Therefore, when the loading device is loaded with weights, the rubber sleeve is easily deformed, and the lever arm is tilted and cannot always remain horizontal. The heavier the loading weight, the more serious the deformation and tilt. At this time, the standard lever arm in the horizontal state is still used as the actual lever arm to calculate the standard torque applied to the torque sensor, which causes errors in the detection and calibration effect, affecting the calibration effect, and there are technical problems such as inconvenience in use and insufficient calibration accuracy. In particular, when the torque input interface of the torque sensor being measured is no longer of standard size due to wear, the connection gap will introduce greater errors. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the technical defects of the torque sensor calibration device in the prior art, such as inconvenience in use and insufficient calibration accuracy.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a torque sensor calibration method, comprising at least the following steps:

[0007] S10: fixing the frame, wherein an adjustment bracket capable of adjusting an angle relative to the frame is provided at one end of the frame, and a mounting end is provided at a free end of the adjustment bracket;

[0008] S20: installing the torque sensor to be calibrated, installing the torque sensor to be calibrated on the mounting end of the adjustment bracket, and electrically connecting the torque sensor to be calibrated to the PLC controller;

[0009] S30: installing a disc-shaped lever, connecting the torque input end of the torque sensor to be calibrated to the center of the disc-shaped lever through a connecting piece, wherein the connecting piece is perpendicular to the disc-shaped lever, and the disc-shaped lever is provided with a loading device;

[0010] S40: adjusting the tilt angle of the adjusting bracket relative to the frame to adjust the disc-shaped lever to a vertical state, and obtaining the tilt angle θ of the axial direction of the torque sensor to be calibrated relative to the horizontal direction;

[0011] S50: Loading a standard weight through the loading device drives the disc-shaped lever to rotate, and the torque value T1 of the torque sensor to be calibrated is displayed on the PLC controller;

[0012] S60: Obtain the standard torque value T applied to the torque sensor to be calibrated by calculation, and the calculation method is as follows:

[0013] T = mg * L * cos θ;

[0014] Where: m is the mass of the loaded standard weight;

[0015] g is the acceleration due to gravity;

[0016] L is the radius of the disc-shaped lever;

[0017] S70: Obtain the torque indication error of the torque sensor to be calibrated by comparing T1 and T, and then calibrate the torque sensor through the PLC controller.

[0018] This embodiment also discloses a torque sensor calibration device using the above calibration method, which at least includes:

[0019] A rack, wherein the rack is fixedly arranged;

[0020] An adjusting bracket, the adjusting bracket is mounted on one end of the frame and can adjust the angle relative to the frame, and a mounting end for mounting the torque sensor to be calibrated is provided at the free end of the adjusting bracket;

[0021] A PLC controller, used for being electrically connected to the torque sensor to be calibrated;

[0022] A disc-shaped lever, wherein the disc-shaped lever is provided with a loading device;

[0023] A connecting piece, used to connect the center of the disc-shaped lever and the torque input end of the torque sensor to be calibrated, wherein the connecting piece is perpendicular to the disc-shaped lever;

[0024] A level, disposed on the connecting member;

[0025] The angle visualization device is arranged on the adjusting bracket and is used to display the inclination angle θ of the adjusting bracket relative to the horizontal direction.

[0026] Preferably, the rack includes a horizontal bracket, a vertical bracket and an oblique bracket connecting the horizontal bracket and the vertical bracket, the upper end of the vertical bracket is fixedly connected to one end of the horizontal bracket, and the lower end of the vertical bracket is provided with a fixing device for fixing the rack.

[0027] Preferably, the fixing device includes an upper clamping plate, a lower clamping plate and a clamping bolt which are relatively arranged. The upper clamping plate is fixedly arranged at the lower end of the vertical bracket. A clamping interval is formed between the upper clamping plate and the lower clamping plate. The clamping bolt is screwed together with the lower clamping plate. A top plate located in the clamping interval is arranged at the upper end of the clamping bolt.

[0028] Preferably, the adjustment bracket is provided with a U-shaped groove for accommodating the horizontal bracket, and the connecting walls on both sides of the U-shaped groove are provided with symmetrically arranged arc grooves and coaxially arranged first hinge holes;

[0029] At least one of the front and rear sides of the horizontal bracket is provided with two slide grooves extending along the length direction, each of the slide grooves is provided with a slider, and the slider is provided with a threaded hole;

[0030] It also includes an adjusting bolt, which passes through the arc groove and fits into the threaded hole on the slider;

[0031] The horizontal support is provided with a first hinge hole adapted to the first hinge hole, and also includes a hinge shaft passing through the first hinge hole and the second hinge hole.

[0032] Preferably, the angle visualization device is an electronic digital level.

[0033] Preferably, the connecting member comprises a first connecting member close to a side of the torque sensor to be calibrated and a second connecting member close to a side of the disc-shaped lever, and the level is arranged on the first connecting member or the second connecting member.

[0034] Preferably, both ends of the first connecting member are provided with square hole connecting ends, both ends of the second connecting member are provided with square core connecting ends, and the center of the disc-shaped lever is provided with a connecting square hole for adapting to the square core connecting end.

[0035] Preferably, the mounting end of the adjustment bracket is provided with a second flange for connecting the torque sensor to be calibrated, and the second flange is provided with a plurality of second connecting holes.

[0036] Preferably, pull ropes tangent to the outer circumference of the disc-shaped lever are provided on both sides of the disc-shaped lever, the upper ends of the pull ropes are fixed on the disc-shaped lever, and the lower ends of the pull ropes are provided with hanging heads; the loading device includes a weight plate and weights, the weight plate is provided with a hanging rod for hanging on the hanging head, and the upper end of the hanging rod is provided with a hook.

[0037] Compared with the prior art, the torque sensor calibration method and device of the present invention have the following beneficial effects:

[0038] (1) Based on the settings of the adjustment bracket, the level meter and the angle visualization device, when the torque input end of the torque sensor to be calibrated is worn, after the disc-shaped lever is adjusted to a vertical state, the inclination angle θ of the axial direction of the torque sensor to be calibrated relative to the horizontal direction can be obtained.

[0039] (2) Based on the obtained inclination angle θ, the standard torque value T applied to the torque sensor to be calibrated can be calculated by the formula T=mg*L*cosθ. The standard torque value T is a corrected torque value, thereby eliminating the error caused by the wear of the torque input end of the torque sensor and greatly improving the calibration accuracy of the torque sensor.

[0040] (3) Since the torque sensor to be calibrated, the connecting piece and the disc-shaped lever are connected by a rigid structure, the force arm is the radius of the disc-shaped lever, and no deformation error will occur, which also improves the calibration accuracy of the torque sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 : is a schematic diagram of the structure of the torque sensor calibration device of this embodiment when the sensor to be calibrated is being calibrated, wherein the torque input end interface of the sensor to be calibrated is in a worn state;

[0042] Figure 2 : is a schematic structural diagram of the torque sensor calibration device of this embodiment in a state of calibrating the sensor to be calibrated, wherein the torque input end interface of the sensor to be calibrated is in an unworn state;

[0043] Figure 3 It is a schematic diagram of the explosion state of the connection between the adjustment bracket and the horizontal bracket in the torque sensor calibration device of this embodiment;

[0044] Figure 4 It is a schematic diagram of a partial cross-sectional structure of the connection between the adjustment bracket and the horizontal bracket in the torque sensor calibration device of this embodiment;

[0045] Figure 5 It is a schematic diagram of the explosion state of the torque sensor to be calibrated, the connecting piece and the disc-shaped lever in the torque sensor calibration device of this embodiment;

[0046] Figure 6 is a schematic structural diagram of a frame fixing device in the torque sensor calibration device of this embodiment;

[0047] Figure 7 FIG. 4 is a flow chart of the torque sensor calibration method according to the present embodiment. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two components; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] A torque sensor calibration device of this embodiment, such as Figure 1 , Figure 2 As shown, it includes a frame 1, an adjustment bracket 2, a PLC controller 4, a connecting piece 5, a disc-shaped lever 6 and a loading device 7, which are used to calibrate the torque of the torque sensor 3 to be calibrated.

[0052] In the process of calibrating the torque sensor, the frame 1 needs to be fixed. The frame 1 can be fixed in a suitable position in a non-detachable manner or in a detachable fixing manner. When the torque sensor needs to be calibrated, the frame 1 is fixed in a suitable position.

[0053] Preferably, a rack 1 of this embodiment comprises a horizontal bracket 11, a vertical bracket 12, and an oblique bracket 13 connecting the horizontal bracket 11 and the vertical bracket 12, wherein the upper end of the vertical bracket 12 is fixedly connected to one end of the horizontal bracket 11, and the two ends of the oblique bracket 13 are respectively fixedly connected to the free ends of the horizontal bracket 11 and the vertical bracket 12, and the three form a triangular structure. In this embodiment, the rack 1 of the triangular structure has the technical advantages of simple structure, light weight and strong stability.

[0054] As a preference, in this embodiment, the frame 1 is fixed in a disassembly manner. Specifically, Figure 1 , Figure 2 and Figure 6 As shown, a fixing device 14 for fixing the frame is provided at the lower end of the vertical support 12 .

[0055] In this embodiment, a preferred structure of the fixing device 14 includes an upper clamping plate 141, a lower clamping plate 142 and a clamping bolt 144 which are arranged relatively to each other. The upper clamping plate 141 is fixedly arranged at the lower end of the vertical bracket 12, one side of the upper clamping plate 141 and the lower clamping plate 142 are fixedly connected, a clamping section 143 is formed between the upper clamping plate 141 and the lower clamping plate 142, the clamping bolt 144 is screw-fitted with the lower clamping plate 142, and a top plate 145 located in the clamping section 143 is arranged at the upper end of the clamping bolt 144. In order to facilitate the operation of the clamping bolt 144, a handle 146 is arranged at its lower end.

[0056] As the special feature of this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, an adjustment bracket 2 is installed at the free end of the horizontal bracket 11. The angle of the adjustment bracket 2 relative to the horizontal bracket 11 is adjustable. The free end of the adjustment bracket 2 is provided with a mounting end for mounting the torque sensor 3 to be calibrated.

[0057] In this embodiment, the adjustment bracket 2 is provided with a first hinged portion rotatably connected to the horizontal bracket 11 and a connection portion for fixed connection to the frame at a position away from the mounting end, and accordingly, a second hinged portion adapted to the first hinged portion is also provided on the horizontal bracket 11. Based on the cooperation between the first hinged portion and the second hinged portion, the inclination angle θ of the adjustment bracket 2 relative to the horizontal bracket 11 can be adjusted. After the adjustment is completed, the relative position between the adjustment bracket 2 and the horizontal bracket 11 is fixed by the fixing structure.

[0058] As a preference, Figure 3 As shown, in this embodiment, the first hinge portion is a first hinge hole 25 provided on the adjustment bracket 2, and the second hinge portion is a second hinge hole 112 provided on the horizontal bracket 11. Figure 4As shown, the hinge bolt 116 passes through the first hinge hole 25 and the second hinge hole 112 in sequence, and is limited by the locking nut 117. In this way, the hinge bolt 116 serves as a hinge axis between the adjustment bracket 2 and the horizontal bracket 11, so that the inclination angle of the adjustment bracket 2 relative to the horizontal bracket 11 can be adjusted.

[0059] like Figure 3 As shown, in this embodiment, the adjustment bracket 2 is provided with a U-shaped groove 22 for accommodating the horizontal bracket 11, and the two sides of the U-shaped groove 22 are connecting walls 21 of the adjustment bracket 2, and the connecting walls 21 on both sides are provided with coaxial first hinge holes 25. In this embodiment, the connecting portion of the adjustment bracket 2 is preferably an arc groove 26, and the arc grooves 21 on the connecting walls 21 on both sides are symmetrically arranged. Correspondingly, symmetrical slide grooves 111 are arranged on the front and rear sides of the horizontal bracket 11, and the slide grooves 111 extend along the length direction of the horizontal bracket 11, and each slide groove 111 is provided with a slider 113, and the slider 113 is provided with a threaded hole 114, and the adjusting bolt 115 passes through the arc groove 26 and is adapted to be connected with the threaded hole 114 on the slider 113.

[0060] It should be noted that the above-mentioned slide groove 111 can be a common T-slot, dovetail groove, etc. Correspondingly, the slider 113 is a T-slot or a dovetail slider, so that the slider can only slide along the length direction of the slide groove.

[0061] As a preferred embodiment of the present invention, two symmetrical slide grooves 111 are provided on the front and rear sides of the horizontal bracket 11, and accordingly, a slider 113 is adapted in each of the slide grooves. The purpose of such a setting is that based on the sliding of the slider in the slide groove and the two sliders on each side, the matching error at the hinge can be automatically eliminated, so that the adjustment bracket can be adjusted to the expected position more accurately.

[0062] In this embodiment, Figure 5 As shown, a first flange 31 is provided at one end of the torque sensor 3 to be calibrated, and a plurality of first connecting holes 33 are provided on the first flange 31. Figure 3 As shown, the mounting end on the adjustment bracket 2 is a second flange 23 adapted to the first flange 31, and the second flange 23 is provided with a plurality of second connection holes 24 corresponding to the first connection holes 33, and the first flange and the second flange are detachably connected by fastening bolts. This connection method ensures that the torque sensor to be calibrated is coaxial with the adjustment bracket, and the inclination angle of the adjustment bracket relative to the horizontal direction is the inclination angle of the torque sensor to be calibrated relative to the horizontal direction.

[0063] As a special feature of this embodiment, an angle visualization device 8 is provided on the adjustment bracket 2 of this embodiment, which is used to measure and display the inclination angle θ of the adjustment bracket 2 and the torque sensor 3 to be calibrated relative to the horizontal direction. Preferably, in this embodiment, the angle visualization device 8 is an electronic digital level. Of course, the electronic digital level is only the best choice for this embodiment, not the only limitation, and any instrument that can be used to measure and display the inclination angle in the prior art can be applied to this embodiment.

[0064] like Figure 5 As shown, the torque output end of the torque sensor 3 to be calibrated is a square shaft 32, and the square shaft 32 is connected to one end of the connecting member 5. In this embodiment, the connecting member 5 includes a first connecting member 51 close to the side of the torque sensor 3 to be calibrated and a second connecting member 52 close to the side of the disc-shaped lever 6, wherein the two ends of the first connecting member 51 are provided with square hole connecting ends 511, and the two ends of the second connecting member 52 are provided with square core connecting ends 52. It should be noted that the sizes of the square hole connecting ends 511 at both ends of the first connecting member 51 may be different, wherein the square hole connecting end 511 at one end is adapted to the square shaft 32, the square hole connecting end 511 at the other end is adapted to the first square core connecting end 521 of the second connecting member 52, and the second square core connecting end 522 of the second connecting member 52 is adapted to the connecting square hole 61 at the center of the disc-shaped lever 6.

[0065] In this embodiment, pull ropes 62 tangent to the outer circumference of the disc-shaped lever are provided on both sides of the disc-shaped lever 6, the upper ends of the pull ropes 62 are fixed on the disc-shaped lever, and the lower ends of the pull ropes 62 are provided with hanging heads 63, and a loading device 7 is hung on each hanging head 63.

[0066] In this embodiment, Figure 1 As shown, the loading device 7 includes a weight plate 72 and a weight 74 . The weight plate 72 is provided with a hanging rod 71 for hanging on the hanging head 63 . The upper end of the hanging rod 71 is provided with a hook 73 .

[0067] In the torque sensor calibration device of this embodiment, by loading weights 74 of different masses on two weight plates 72, the disc-shaped lever 6 is driven to rotate, and then the torque is transmitted to the torque input end of the torque sensor to be calibrated through the connecting member 5. Since the pull rope 62 is always tangent to the disc-shaped lever 6, the radius L of the disc-shaped lever is the lever arm. In addition, since the torque sensor to be calibrated, the connecting member and the disc-shaped lever are connected by a rigid structure, the lever arm will not have deformation error.

[0068] In this embodiment, the PLC controller 4 is installed on the frame 1 and is electrically connected to the torque sensor 3 to be calibrated, and is used to display the torque magnitude of the torque sensor 3 to be calibrated, and compare the displayed torque with the calculated applied standard torque to obtain the torque indication error, and then calibrate the torque sensor through the PLC controller. It should be noted that the PLC controller 4 is a mature technology used in the existing torque sensor calibration, and will not be described in detail here.

[0069] The torque sensor calibration device of this embodiment needs to ensure that the disc-shaped lever is in a vertical state when calibrating the torque sensor. During calibration, the disc-shaped lever 6 is adjusted to a vertical state by adjusting the inclination angle θ of the adjustment bracket 2. Since the connecting member 5 and the disc-shaped lever 6 are standard parts for testing, their matching accuracy can be guaranteed. The connecting member 5 is perpendicular to the disc-shaped lever 6. In this embodiment, by installing a level 8 on the connecting member 5 and adjusting the connecting member 5 to a horizontal state, it can be considered that the disc-shaped lever 6 is in a vertical state. Preferably, in this embodiment, the level 8 is an electronic digital level.

[0070] A torque sensor calibration method of this embodiment is applied to the aforementioned torque sensor calibration device. Figure 7 As shown, the following steps are included:

[0071] S10: Fixing the rack. In this embodiment, the step of fixing the rack includes:

[0072] S11: Screw the clamping bolt 144 to a lower position so that the distance between the top plate 145 and the upper clamping plate 141 is greater than the thickness of the desktop at the fixed position;

[0073] S12: Move the frame 1 so that the desktop enters the area between the top plate 145 and the upper clamping plate 141;

[0074] S13: The clamping bolt 144 is rotated by operating the handle 146 to clamp the desktop, thereby fixing the rack 1 to the edge of the desktop.

[0075] In this embodiment, the fixing device of the frame has a simple structure, the fixing method is easy to operate, the use is convenient, and the application scenarios are rich.

[0076] S20: Install the torque sensor to be calibrated. The installation steps include:

[0077] S21: The first flange 31 of the torque sensor 3 to be calibrated is placed face to face with the second flange 23 on the adjustment bracket 2, and the positions of the first connecting holes 33 and the second connecting holes 24 are aligned;

[0078] S22: fastening bolts are inserted into the first connection hole 33 and the second connection hole 24, and the first flange 31 and the second flange 23 are connected by the fastening bolts;

[0079] S23: Electrically connect the torque sensor to be calibrated to the PLC controller.

[0080] S30: Install the disc-shaped lever, the installation steps include:

[0081] S31: the square hole connection end 511 at one end of the first connection member 51 is plugged into and matched with the square shaft 32 of the torque sensor 3 to be calibrated;

[0082] S32: the square hole connection end 511 at the other end of the first connection member 51 is plugged into and matched with the first square core connection end 521 of the second connection member 52;

[0083] S33: The second square core connection end 522 of the second connection member 52 is plugged into and matched with the connection square hole 61 at the center of the disc-shaped lever 6;

[0084] S34: Hang the two standard weight plates 72 on the hanging heads 63 at the lower ends of the pull ropes 62 through the hooks 73 respectively.

[0085] S40: By adjusting the tilt angle of the adjustment bracket relative to the frame, the disc-shaped lever is adjusted to a vertical state, and the tilt angle θ of the axial direction of the torque sensor to be calibrated relative to the horizontal direction is obtained. Specifically, the following steps are included:

[0086] S41: Loosen each adjusting bolt 115;

[0087] S42: driving the adjustment bracket 2 to rotate around the hinge axis until the level gauge 8 on the connecting member 5 is displayed in a horizontal state. Since the connecting member 5 is perpendicular to the disc-shaped lever 6, the connecting member 5 is adjusted to a horizontal state, and the disc-shaped lever 6 is considered to be in a vertical state;

[0088] S43: Tighten each adjusting bolt 115;

[0089] S44: Obtain the tilt angle θ displayed on the angle visualization device 8.

[0090] S50: Loading a standard weight through the loading device drives the disc-shaped lever to rotate, and the torque value T1 of the torque sensor to be calibrated is displayed on the PLC controller;

[0091] S60: Obtaining a standard torque value T applied to the torque sensor to be calibrated by calculation.

[0092] If the square shaft 32 of the torque sensor 3 to be calibrated is worn, the state of the torque sensor calibration device is as follows: Figure 1As shown, the tilt angle of the adjustment bracket 2 and the torque sensor 3 to be calibrated relative to the horizontal direction is θ. In this state, the tension applied by the loading device is decomposed into an axial component coaxial with the torque sensor 3 to be calibrated and a rotational component that causes the torque sensor 3 to be calibrated to rotate around the central axis. In this state, the calculation method of the standard torque value T is as follows:

[0093] T = mg * L * cos θ;

[0094] Where: m is the mass of the loaded standard weight;

[0095] g is the acceleration due to gravity;

[0096] L is the radius of the disc-shaped lever.

[0097] If the square shaft 32 of the torque sensor 3 to be calibrated is not worn, then Figure 2 As shown, when the disc-shaped lever 6 is adjusted to a vertical state, the adjustment bracket 2 and the torque sensor to be calibrated 3 are in a horizontal state, that is, θ=0°. At this time, cosθ=1, that is, the calculation method of the standard torque value T is as follows:

[0098] T=mg*L*cosθ= mg*L*1= mg*L.

[0099] S70: Obtain the torque indication error of the torque sensor to be calibrated by comparing T1 and T, and then calibrate the torque sensor through the PLC controller.

[0100] In this embodiment, when the square shaft 32 of the torque sensor 3 to be calibrated is worn, the standard torque applied to the torque sensor to be calibrated can be corrected, thereby eliminating the error caused by the wear of the torque input end of the torque sensor, and greatly improving the calibration accuracy of the torque sensor.

[0101] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A torque sensor calibration method, characterized in that: At least the following steps are included: S10: fixing the frame, wherein an adjustment bracket capable of adjusting an angle relative to the frame is disposed at one end of the frame, and a mounting end is disposed at a free end of the adjustment bracket; S20: installing the torque sensor to be calibrated, installing the torque sensor to be calibrated on the mounting end of the adjustment bracket, and electrically connecting the torque sensor to be calibrated to the PLC controller; S30: installing a disc-shaped lever, connecting the torque input end of the torque sensor to be calibrated to the center of the disc-shaped lever through a connecting piece, wherein the connecting piece is perpendicular to the disc-shaped lever, and the disc-shaped lever is provided with a loading device; S40: adjusting the tilt angle of the adjusting bracket relative to the frame to adjust the disc-shaped lever to a vertical state, and obtaining the tilt angle θ of the axial direction of the torque sensor to be calibrated relative to the horizontal direction; S50: Loading a standard weight through the loading device drives the disc-shaped lever to rotate, and the torque value T1 of the torque sensor to be calibrated is displayed on the PLC controller; S60: Obtain the standard torque value T applied to the torque sensor to be calibrated by calculation, and the calculation method is as follows: T = mg * L * cos θ; Where: m is the mass of the loaded standard weight; g is the acceleration due to gravity; L is the radius of the disc-shaped lever; S70: Obtain the torque indication error of the torque sensor to be calibrated by comparing T1 and T, and then calibrate the torque sensor through the PLC controller.

2. A torque sensor calibration device using the calibration method of claim 1, characterized in that: At least: A rack, wherein the rack is fixedly arranged; An adjusting bracket, the adjusting bracket is mounted on one end of the frame and can adjust the angle relative to the frame, and a mounting end for mounting the torque sensor to be calibrated is provided at the free end of the adjusting bracket; A PLC controller, used for being electrically connected to the torque sensor to be calibrated; A disc-shaped lever, wherein the disc-shaped lever is provided with a loading device; A connecting piece, used to connect the center of the disc-shaped lever and the torque input end of the torque sensor to be calibrated, wherein the connecting piece is perpendicular to the disc-shaped lever; A level, disposed on the connecting member; The angle visualization device is arranged on the adjusting bracket and is used to display the inclination angle θ of the adjusting bracket relative to the horizontal direction.

3. The torque sensor calibration device according to claim 2, characterized in that: The frame includes a horizontal support, a vertical support and an oblique support connecting the horizontal support and the vertical support. The upper end of the vertical support is fixedly connected to one end of the horizontal support. The lower end of the vertical support is provided with a fixing device for fixing the frame.

4. The torque sensor calibration device according to claim 3, characterized in that: The fixing device includes an upper clamping plate, a lower clamping plate and a clamping bolt which are arranged relatively to each other. The upper clamping plate is fixedly arranged at the lower end of the vertical bracket. A clamping interval is formed between the upper clamping plate and the lower clamping plate. The clamping bolt is screwed together with the lower clamping plate. A top plate located in the clamping interval is arranged at the upper end of the clamping bolt.

5. The torque sensor calibration device according to claim 3, characterized in that: The adjusting bracket is provided with a U-shaped groove for accommodating the horizontal bracket, and the connecting walls on both sides of the U-shaped groove are provided with symmetrically arranged arc grooves and coaxially arranged first hinge holes; At least one of the front and rear sides of the horizontal bracket is provided with two slide grooves extending along the length direction, each of the slide grooves is provided with a slider, and the slider is provided with a threaded hole; It also includes an adjusting bolt, which passes through the arc groove and fits into the threaded hole on the slider; The horizontal support is provided with a second hinge hole adapted to the first hinge hole, and also includes a hinge shaft passing through the first hinge hole and the second hinge hole.

6. The torque sensor calibration device according to any one of claims 2 to 5, characterized in that: The angle visualization device is an electronic digital level.

7. The torque sensor calibration device according to any one of claims 2 to 5, characterized in that: The connecting member comprises a first connecting member close to a side of the torque sensor to be calibrated and a second connecting member close to a side of the disc-shaped lever, and the level is arranged on the first connecting member or the second connecting member.

8. The torque sensor calibration device according to claim 7, characterized in that: The first connecting member is provided with square hole connecting ends at both ends, the second connecting member is provided with square core connecting ends at both ends, and the center of the disc-shaped lever is provided with a connecting square hole adapted to the square core connecting end.

9. The torque sensor calibration device according to any one of claims 2 to 5, characterized in that: The mounting end of the adjustment bracket is provided with a second flange for connecting the torque sensor to be calibrated, and the second flange is provided with a plurality of second connection holes.

10. The torque sensor calibration device according to any one of claims 2 to 5, characterized in that: Pull ropes tangent to the outer circumference of the disc-shaped lever are arranged on both sides of the disc-shaped lever, the upper ends of the pull ropes are fixed on the disc-shaped lever, and the lower ends of the pull ropes are arranged with hanging heads; the loading device includes a weight plate and weights, the weight plate is provided with a hanging rod for hanging on the hanging head, and the upper end of the hanging rod is provided with a hook.

Images