Torque sensor calibration device

Abstract

The utility model relates to the technical field of torque sensor calibration, and particularly discloses a torque sensor calibration device, which comprises a rack, an adjusting bracket, a PLC (Programmable Logic Controller), a disc-shaped lever, a connecting piece, a gradienter and an angle visual device, the free end of the adjusting support is provided with an installation end used for installing a torque sensor to be calibrated. The connecting piece is used for connecting the disc-shaped lever and the torque sensor to be calibrated, and the connecting piece is perpendicular to the disc-shaped lever. According to the torque sensor calibration device, due to the arrangement of the adjusting bracket, the inclination angle theta of the torque sensor to be calibrated relative to the horizontal direction can be obtained through the adjusting bracket under the condition that the torque input end of the torque sensor to be calibrated is worn, so that the standard torque applied to the torque sensor to be calibrated can be corrected; therefore, errors caused by abrasion of the torque input end of the torque sensor are eliminated, and the calibration precision of the torque sensor is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of torque sensor calibration, in particular to a torque sensor calibration device. Background Art

[0002] Torque sensor, also known as torque sensor, torque sensor, torque sensor, torque meter, 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 the torsional torque perception on various rotating or non-rotating mechanical parts.

[0003] Traditional torque sensor calibration devices apply a known torsional force to the torque shaft and then observe the value on the torque sensor to determine whether it is calibrated. For example, utility model patent publication number CN216669114U proposes a torque sensor calibration device that includes a mounting plate, a clamping device, a lever arm, and a loading device. In practice, this patented technical solution uses a known weight in the loading device to provide power, thereby applying a force to the torque sensor's torque shaft to determine the torque sensor's detection error.

[0004] However, in the specific implementation of the technical solution of the aforementioned patent, the lever arm and the torque sensor are connected by a rubber sleeve. The rubber sleeve has a certain degree of elasticity. Therefore, when the loading device is loaded with weights, the rubber sleeve is easily deformed, and the lever arm tilts and cannot always remain horizontal. The heavier the loading weight, the more severe the deformation and tilt. In this case, 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 results, affecting the calibration effect. 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 even greater errors. Summary of the Invention

[0005] The technical problem to be solved by the utility model 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 present invention provides the following technical solutions: a torque sensor calibration device, comprising at least:

[0007] A rack, wherein the rack is fixedly arranged;

[0008] an adjusting bracket, the adjusting bracket being mounted on one end of the frame and capable of adjusting an angle relative to the frame, the free end of the adjusting bracket being provided with a mounting end for mounting a torque sensor to be calibrated;

[0009] A PLC controller, used for being electrically connected to the torque sensor to be calibrated;

[0010] a disc-shaped lever, wherein the disc-shaped lever is provided with a loading device;

[0011] a connecting member, 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 member is perpendicular to the disc-shaped lever;

[0012] a level, disposed on the connecting member;

[0013] The angle visualization device is provided on the adjustment bracket and is used to display the tilt angle θ of the adjustment bracket relative to the horizontal direction.

[0014] In a preferred embodiment, the angle visualization device is an electronic digital level.

[0015] In a preferred embodiment, pull ropes tangential 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 to the disc-shaped lever, and the lower ends of the pull ropes are provided with hanging heads.

[0016] In a preferred embodiment, the loading device includes a weight plate and weights, the weight plate is provided with a hanging rod for hanging on the suspension head, and the upper end of the hanging rod is provided with a hook.

[0017] In a preferred embodiment, the connecting member includes 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 provided on the first connecting member or the second connecting member.

[0018] In a preferred embodiment, 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.

[0019] In a preferred embodiment, the adjustment bracket is provided with a first hinge portion rotatably connected to the frame and a connection portion for fixedly connected to the frame at a position away from the mounting end, the mounting end of the adjustment bracket is provided with a second flange, and the second flange is provided with a plurality of second connection holes.

[0020] In a preferred embodiment, 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, the lower end of the vertical bracket is provided with a fixing device for fixing the rack, and the adjustment bracket is provided at the free end of the horizontal rack.

[0021] In a preferred embodiment, at least one of the front and rear sides of the horizontal bracket is provided with two sliding grooves extending along the length direction, and a slider is provided in each of the sliding grooves, and a threaded hole is provided on the slider; the horizontal bracket is also provided with a second hinge part adapted to the first hinge part; the connecting part of the adjustment bracket is an arc-shaped groove, and also includes an adjustment bolt passing through the arc-shaped groove and adapted to be connected to the threaded hole on the slider.

[0022] In a preferred embodiment, two symmetrical sliding grooves are provided on the front and rear sides of the horizontal bracket, the adjustment bracket is provided with a U-shaped groove for accommodating the horizontal bracket, and symmetrically arranged arc grooves are provided on the connecting walls on both sides of the U-shaped groove; the first hinge part and the second hinge part are both circular holes, and a hinge shaft is passed through the circular hole.

[0023] Compared with the prior art, the torque sensor calibration device of the present invention has an adjustment bracket. When the torque input end of the torque sensor to be calibrated is worn, the inclination angle of the torque sensor to be calibrated relative to the horizontal direction can be obtained by adjusting the bracket, so that 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : is a schematic structural diagram of the torque sensor calibration device of this embodiment in a state of calibrating a sensor to be calibrated, wherein the torque input interface of the sensor to be calibrated is in a worn state;

[0025] Figure 2 Schematic diagram of the structure of the torque sensor calibration device of this embodiment when calibrating the sensor to be calibrated, wherein the torque input interface of the sensor to be calibrated is in an unworn state;

[0026] Figure 3 This is a schematic diagram of the explosion state at the connection between the adjustment bracket and the horizontal bracket in the torque sensor calibration device of this embodiment;

[0027] Figure 4 Schematic diagram of a partial cross-section of the connection between the adjustment bracket and the horizontal bracket in the torque sensor calibration device of this embodiment;

[0028] Figure 5 Schematic diagram of the torque sensor to be calibrated, the connecting piece, and the disc-shaped lever in the torque sensor calibration device of this embodiment in an exploded state;

[0029] Figure 6 Schematic diagram of the structure of the frame fixing device in the torque sensor calibration device of this embodiment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to 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.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified 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 communication 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.

[0033] like Figure 1 、 Figure 2 As shown, a torque sensor calibration device of this embodiment 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 is used to calibrate the torque of the torque sensor 3 to be calibrated.

[0034] During the calibration of the torque sensor, the frame 1 needs to be fixed. The frame 1 can be fixed in an appropriate position in a non-detachable manner or in a detachable manner. When the torque sensor needs to be calibrated, the frame 1 is fixed in an appropriate position.

[0035] Preferably, a rack 1 of this embodiment includes a horizontal bracket 11, a vertical bracket 12, and a diagonal bracket 13 connecting the horizontal bracket 11 and the vertical bracket 12. The upper end of the vertical bracket 12 is fixedly connected to one end of the horizontal bracket 11, and the ends of the diagonal bracket 13 are respectively fixedly connected to the free ends of the horizontal bracket 11 and the vertical bracket 12, forming a triangular structure. In this embodiment, the triangular-structured rack 1 has the technical advantages of simple structure, light weight, and strong stability.

[0036] As a preference, in this embodiment, the frame 1 adopts a detachable fixing method. Specifically, Figure 1 、 Figure 2and Figure 6 As shown, a fixing device 14 for fixing the frame is provided at the lower end of the vertical bracket 12 .

[0037] 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 opposite each other. The upper clamping plate 141 is fixedly mounted on 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, forming a clamping section 143 between the upper clamping plate 141 and the lower clamping plate 142. The clamping bolt 144 is threadedly engaged with the lower clamping plate 142. The upper end of the clamping bolt 144 is provided with a top plate 145 located within the clamping section 143. To facilitate operation of the clamping bolt 144, a handle 146 is provided at its lower end.

[0038] The working principle of the fixing device 14 is as follows: when the frame 1 needs to be fixed, the clamping bolt 144 is rotated 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 in the fixed position. The frame 1 is then moved so that the desktop enters the space between the top plate 145 and the upper clamping plate 141. The clamping bolt 144 is rotated by operating the handle 146 to clamp the desktop, thereby fixing the frame 1 to the edge of the desktop. This fixing device has a simple structure, is easy to operate, is highly convenient to use, and has a wide range of application scenarios.

[0039] 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.

[0040] 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, located away from the mounting end. Accordingly, the horizontal bracket 11 is also provided with a second hinged portion that mates with the first hinged portion. The cooperation between the first and second hinged portions allows adjustment of the inclination angle θ of the adjustment bracket 2 relative to the horizontal bracket 11. Once adjustment is complete, the relative position of the adjustment bracket 2 and the horizontal bracket 11 is fixed by a fixing structure.

[0041] As a preference, Figure 3 As shown, the first hinge portion in this embodiment 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 the 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.

[0042] 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. The U-shaped groove 22 is flanked by connecting walls 21 of the adjustment bracket 2. 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 arcuate groove 26, and the arcuate grooves 21 on the connecting walls 21 on both sides are symmetrically arranged. Accordingly, symmetrical slide grooves 111 are provided on the front and rear sides of the horizontal bracket 11. The slide grooves 111 extend along the length of the horizontal bracket 11. Each slide groove 111 is provided with a slider 113, and the slider 113 is provided with a threaded hole 114. An adjusting bolt 115 passes through the arcuate groove 26 and is adapted to connect with the threaded hole 114 on the slider 113.

[0043] In this embodiment, when the tilt angle θ of the adjustment bracket 2 relative to the horizontal bracket (horizontal direction) needs to be adjusted, the adjustment bolts 115 are loosened, adjusted to the desired position around the hinge axis, and then tightened.

[0044] It should be noted that the above-mentioned slide groove 111 can be a common T-slot, dovetail groove, etc., and accordingly, the slider 113 is a T-slot or dovetail slider, so that the slider can only slide along the length direction of the slide groove.

[0045] As a preferred embodiment of this 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 presence of two sliders on each side, the fitting error at the hinge can be automatically eliminated, thereby more accurately adjusting the adjustment bracket to the expected position.

[0046] 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 connection holes 33 are provided on the first flange 31. Figure 3 As shown, the mounting end of the adjustable bracket 2 is a second flange 23 that mates with the first flange 31. This second flange 23 is provided with a plurality of second connection holes 24 corresponding to the first connection holes 33. The first and second flanges are detachably connected by fastening bolts. This connection ensures that the torque sensor to be calibrated is coaxial with the adjustable bracket. The tilt angle of the adjustable bracket relative to the horizontal direction is the same as the tilt angle of the torque sensor to be calibrated relative to the horizontal direction.

[0047] A unique feature of this embodiment is that the adjustment bracket 2 is provided with an angle visualization device 8 for measuring and displaying the tilt angle θ between the adjustment bracket 2 and the torque sensor 3 to be calibrated relative to the horizontal. Preferably, in this embodiment, the angle visualization device 8 is an electronic digital level. Of course, the electronic digital level is only the optimal choice for this embodiment, not the only limitation. Any device known in the art for measuring and displaying tilt angles can be used in this embodiment.

[0048] like Figure 5 As shown, the torque output end of the torque sensor 3 to be calibrated is a square shaft 32, which is connected to one end of the connector 5. In this embodiment, the connector 5 includes a first connector 51 located near the torque sensor 3 to be calibrated and a second connector 52 located near the disc-shaped lever 6. Square hole connectors 511 are provided at both ends of the first connector 51, while square core connectors 52 are provided at both ends of the second connector 52. It should be noted that the sizes of the square hole connectors 511 at both ends of the first connector 51 may differ. The square hole connector 511 at one end is adapted to fit the square shaft 32, while the square hole connector 511 at the other end is adapted to fit the first square core connector 521 of the second connector 52. The second square core connector 522 of the second connector 52 is adapted to fit the connecting square hole 61 at the center of the disc-shaped lever 6.

[0049] 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 end of the pull rope 62 is fixed on the disc-shaped lever, and the lower end of the pull rope 62 is provided with a hanging head 63, and a loading device 7 is hung on each hanging head 63.

[0050] 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 suspension head 63 , and a hook 73 is provided at the upper end of the hanging rod 71 .

[0051] In this embodiment of the torque sensor calibration device, loading weights 74 of varying masses onto two weight plates 72 drives the disc-shaped lever 6 to rotate, transmitting torque to the torque input of the torque sensor to be calibrated via the connector 5. Because the pull cord 62 is always tangent to the disc-shaped lever 6, the radius L of the disc-shaped lever is the moment arm. Furthermore, because the torque sensor to be calibrated, the connector, and the disc-shaped lever are rigidly connected, the moment arm is immune to deformation errors.

[0052] In this embodiment, a PLC controller 4 is mounted on the frame 1 and electrically connected to the torque sensor 3 to be calibrated. It is used to display the magnitude of the torque applied to the torque sensor 3 to be calibrated, compare the displayed torque with the calculated standard torque, and obtain the torque indication error. The torque sensor is then calibrated using the PLC controller. It should be noted that the PLC controller 4 represents a mature technology used in existing torque sensor calibration and will not be described in detail here.

[0053] The torque sensor calibration device of this embodiment requires ensuring that the disc-shaped lever is in a vertical position when calibrating the torque sensor. During calibration, the disc-shaped lever 6 is adjusted to a vertical position by adjusting the tilt angle θ of the adjustment bracket 2. Because the connector 5 and the disc-shaped lever 6 are standard test components, their matching accuracy can be guaranteed. The connector 5 is perpendicular to the disc-shaped lever 6. In this embodiment, by installing a level 8 on the connector 5 and adjusting the connector 5 to a horizontal position, the disc-shaped lever 6 is considered to be in a vertical position. Preferably, in this embodiment, the level 8 is an electronic digital level.

[0054] It should be noted that the square shaft 32 of the torque sensor may be worn during daily use. 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. In this state, the standard torque value T applied to the torque sensor to be calibrated 3 is calculated as follows:

[0055] T = mg*L;

[0056] Where: m is the mass of the loaded standard weight;

[0057] g is the acceleration due to gravity;

[0058] L is the radius of the disc lever.

[0059] By comparing the standard torque value T obtained by the above calculation with the torque value T1 displayed on the PLC controller, the torque indication error of the torque sensor to be calibrated is obtained, and then the torque sensor is calibrated through the PLC controller.

[0060] If the square shaft 32 of the torque sensor 3 to be calibrated is worn, Figure 1As shown, when the disc-shaped lever 6 is adjusted to a vertical position, the tilt angle θ between the adjustment bracket 2 and the torque sensor 3 to be calibrated relative to the horizontal direction is adjusted. In this state, the tensile force 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 rotates the torque sensor 3 about its central axis. Therefore, the torque applied by the loading device to the torque sensor to be calibrated needs to be corrected to obtain the standard torque value T. The correction calculation method is as follows:

[0061] T=mg*L*cosθ;

[0062] Where: m is the mass of the loaded standard weight;

[0063] g is the acceleration due to gravity;

[0064] L is the radius of the disc-shaped lever;

[0065] By comparing the standard torque value T obtained by the above calculation with the torque value T1 displayed on the PLC controller, the torque indication error of the torque sensor to be calibrated is obtained, and then the torque sensor is calibrated through the PLC controller.

[0066] The special feature of this embodiment is that, when the torque input end of the torque sensor to be calibrated is worn, the adjustment bracket 2 is provided, and the inclination angle of the torque sensor to be calibrated relative to the horizontal direction can be obtained by adjusting the bracket, so that 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.

[0067] 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 replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A torque sensor calibration device, characterized in that: At least: A rack, wherein the rack is fixedly arranged; an adjusting bracket, the adjusting bracket being mounted on one end of the frame and capable of adjusting an angle relative to the frame, the free end of the adjusting bracket being provided with a mounting end for mounting a torque sensor to be calibrated; 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 member, 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 member is perpendicular to the disc-shaped lever; a level, disposed on the connecting member; The angle visualization device is provided on the adjustment bracket and is used to display the tilt angle θ of the adjustment bracket relative to the horizontal direction.

2. The torque sensor calibration device according to claim 1, characterized in that: The angle visualization device is an electronic digital level.

3. The torque sensor calibration device according to claim 1, characterized in that: Draw 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 draw ropes are fixed on the disc-shaped lever, and the lower ends of the draw ropes are provided with hanging heads.

4. The torque sensor calibration device according to claim 3, characterized in that: The loading device includes a weight plate and a weight. The weight plate is provided with a hanging rod for hanging on a suspension head. The upper end of the hanging rod is provided with a hook.

5. The torque sensor calibration device according to claim 1, characterized in that: The connecting member includes 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.

6. The torque sensor calibration device according to claim 5, characterized in that: 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.

7. The torque sensor calibration device according to any one of claims 1 to 6, characterized in that: The adjustment bracket is provided with a first hinge portion rotatably connected to the frame and a connection portion for fixedly connected to the frame at a position away from the mounting end. The mounting end of the adjustment bracket is provided with a second flange, and the second flange is provided with multiple second connection holes.

8. The torque sensor calibration device according to claim 7, characterized in that: 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. The lower end of the vertical bracket is provided with a fixing device for fixing the rack. The adjustment bracket is provided at the free end of the horizontal bracket.

9. The torque sensor calibration device according to claim 8, characterized in that: At least one of the front and rear sides of the horizontal bracket is provided with two sliding grooves extending along the length direction, and a slider is provided in each sliding groove, and a threaded hole is provided on the slider; the horizontal bracket is also provided with a second hinge part adapted to the first hinge part; the connecting part of the adjustment bracket is an arc-shaped groove, and also includes an adjustment bolt passing through the arc-shaped groove and adapted to be connected to the threaded hole on the slider.

10. The torque sensor calibration device according to claim 9, characterized in that: Two symmetrical sliding grooves are provided on the front and rear sides of the horizontal bracket, the adjustment bracket is provided with a U-shaped groove for accommodating the horizontal bracket, and symmetrically arranged arc grooves are provided on the connecting walls on both sides of the U-shaped groove; the first hinge part and the second hinge part are both circular holes, and a hinge shaft is passed through the circular hole.

Images