Torque wrench calibrating device on torque standard machine

Abstract

The invention relates to a torque wrench calibrating device on a torque standard machine, which comprises a base rod of which the axis extends along the left-right direction, and further comprises a left side top plate assembly and a right side clamping plate assembly which are arranged on the left side and the right side, and the left side top plate assembly comprises an upper side top plate and a lower side top plate which are distributed on the upper side and the lower side of the base rod; the left side clamping plate assembly comprises an upper side clamping plate and a lower side clamping plate which are distributed on the upper side and the lower side of the base rod, and the right end of the upper side clamping plate and the right end of the lower side clamping plate are used for stretching into the upper side and the lower side of an outer square head of the torque wrench. The base rod is provided with an assembly driving mechanism used for driving the upper side top plate and the lower side top plate to move backwards and relatively and driving the upper side clamping plate and the lower side clamping plate to move backwards and relatively. The torque wrench solves the technical problem that torque measurement is affected due to the fact that a gap exists between an outer square head of the torque wrench and a transmission square hole in a transmission shaft in the prior art.

Description

Technical Field

[0001] The invention relates to the field of torque wrench calibration and verification, and in particular to a torque wrench verification device on a torque standard machine. Background Art

[0002] The lever-type torque standard machine uses the gravity of the weight as the standard load, which is amplified by a certain lever mechanism and then generates a standard torque through the action of the lever arm. With the help of appropriate mechanisms, the torque standard machine automatically, smoothly and accurately applies the action torque and the balance torque to the torque meter (or torque sensor, torque wrench, torque screwdriver) to be tested / calibrated in a predetermined order. The torque standard machine in the prior art usually includes a frame, on which a drive motor is installed for guiding movement along the left and right directions, a first transmission square hole is provided at the power output end of the drive motor, a bearing seat is provided on the frame on the left side of the drive motor, a transmission shaft is rotatably installed on the bearing seat, a second transmission square hole is provided at the right end of the transmission shaft, and a force arm lever is connected to the left end of the transmission shaft, and weights are provided at both ends of the force arm lever.

[0003] When in use, the object to be tested needs to be connected between the first transmission square hole and the second transmission square hole. The object to be tested can be a torque sensor or a torque wrench. The number of weights at both ends of the lever arm is adjusted so that the lever arm produces a set torque. The driving motor adjusts the level of the lever arm through the object to be tested. At this time, the object to be tested can be calibrated by comparing the set torque value with the reading of the object to be tested.

[0004] For the torque wrench, it has a longer wrench arm, so its calibration process is slightly different from the calibration process of the torque sensor. The torque wrench needs to use a special calibration device to achieve transmission connection with the torque standard machine. The torque wrench calibration device on the existing torque standard machine is such as the "A wrench torque calibration device for torque standard machine" disclosed in Chinese patent CN204479240U, which includes a balancing adjustment device connected to the connecting shaft of the torque beam of the torque standard machine, that is, the transmission shaft, and a supporting balancing device connected to the connecting shaft of the balancing mechanism at one end. The torque wrench to be tested is arranged between the balancing adjustment device and the supporting balancing adjustment device. Specifically, one end of the balancing adjustment device is connected to the transmission shaft, the outer square head of the torque wrench is inserted into the inner square hole of the balancing adjustment device, and the supporting balancing device has a sleeve connected to the drive motor transmission, a supporting balancing arm connected to the sleeve, and a supporting clamp connected to the wrench arm of the torque wrench is provided on the supporting balancing arm. A balancing weight for balancing the torque wrench is provided on the balancing adjustment device, which is opposite to the torque wrench.

[0005] When in use, the torque wrench to be tested is connected between the drive motor and the transmission shaft of the torque standard machine using a wrench calibration device. When the lever arm is horizontal, the torque wrench is also horizontal. In order to avoid the influence of the torque wrench's own weight on the torque measurement, a counterweight is used to balance the torque wrench's own weight.

[0006] This type of wrench calibration device needs to use a balancing adjustment device because it needs to balance the influence of the torque wrench's own weight on the torque measurement, which is rather troublesome. In this regard, the applicant uses a new calibration form, that is, when the force arm lever is horizontal, the torque wrench's wrench arm is arranged vertically, so as to avoid the influence of the torque wrench's own weight on the torque measurement. However, during use, the applicant discovered a new problem. Due to wear or processing problems, there is a matching tolerance between the outer square head of the torque wrench and the transmission square hole on the transmission shaft, resulting in the inability to accurately ensure that the torque wrench is in a completely vertical posture. In this way, the torque wrench's own weight may still produce skewed torque and affect the torque measurement. Summary of the invention

[0007] The purpose of the present invention is to provide a torque wrench calibration device on a torque standard machine to solve the technical problem in the prior art that there is a gap between the outer square head of the torque wrench and the transmission square hole on the transmission shaft, which causes the torque wrench to be unable to maintain a vertical posture, and then causes the wrench arm of the torque wrench to generate a deflection torque and affect the torque measurement.

[0008] In order to solve the above technical problems, the technical solution of a torque wrench calibration device on a torque standard machine in the present invention is as follows: A torque wrench calibration device on a torque standard machine comprises a base rod with an axis extending in the left-right direction, and also comprises a left top plate assembly and a right clamping plate assembly arranged on the left and right sides. The left top plate assembly comprises an upper top plate and a lower top plate distributed on the upper and lower sides of the base rod, and the left ends of the upper top plate and the lower top plate are used to extend into the transmission square hole on the transmission shaft. The right clamping plate assembly comprises an upper clamping plate and a lower clamping plate distributed on the upper and lower sides of the base rod, and the right ends of the upper clamping plate and the lower clamping plate are used to extend into the outer square head of the torque wrench. On the upper and lower sides of the base rod, there are provided with component driving mechanisms for driving the upper top plate and the lower top plate to move back and relative to each other, and for driving the upper clamping plate and the lower clamping plate to move back and relative to each other. A left friction disc is mounted on the right end of the upper top plate and / or the lower top plate along the left and right directions. A right friction disc corresponding to the left friction disc is provided on the upper clamping plate and / or the lower clamping plate. A friction disc driving mechanism for driving the left friction disc to move left and right is provided on the upper top plate and / or the lower top plate.

[0009] Furthermore, a guide rod with an axis extending in the left-right direction is fixed on the left friction disc, and a friction disc mounting plate is provided at the right end of the upper top plate and / or the lower top plate, and the guide rod is assembled on the friction disc mounting plate for guiding movement in the left-right direction.

[0010] Furthermore, the friction disc drive mechanism includes a reset tension spring arranged between the right side surface of the friction disc mounting plate and the left side surface of the left friction disc. The friction disc drive mechanism also includes a mounting plate coil arranged on the friction disc mounting plate and a friction disc coil arranged on the left side of the left friction disc. When the mounting plate coil and the friction disc coil are energized, the adjacent ends of the mounting plate coil and the friction disc coil generate the same magnetic poles.

[0011] Furthermore, the component driving mechanism includes a moving part that can move left and right along the base rod, the moving part is connected to the upper top plate and the lower top plate through a left connecting rod mechanism, and the moving part is connected to the upper clamping plate and the lower clamping plate through a right connecting rod mechanism.

[0012] Furthermore, the base rod is a screw rod, and a base rod outer square head for torque input is arranged in the middle of the base rod. The left connecting rod mechanism and the right connecting rod mechanism are both parallelogram connecting rod mechanisms. The moving part includes a left screw sleeve threadedly connected to the left end of the base rod, and the moving part also includes a right screw sleeve threadedly connected to the right end of the base rod. The thread rotation directions of the left screw sleeve and the right screw sleeve are opposite.

[0013] Furthermore, the left-side connecting rod mechanism includes an upper connecting rod mechanism of the top plate and a lower connecting rod mechanism of the top plate. The upper connecting rod mechanism of the top plate includes a first connecting rod and a second connecting rod arranged in parallel on the left and right sides. The upper ends of the first connecting rod and the second connecting rod are hingedly connected to the upper top plate, and the lower ends of the first connecting rod and the second connecting rod are hingedly connected to the upper end of the left-side screw sleeve; the lower-side connecting rod mechanism of the top plate includes a third connecting rod and a fourth connecting rod arranged in parallel on the left and right sides. The upper ends of the third connecting rod and the fourth connecting rod are hingedly connected to the lower end of the left-side screw sleeve, and the lower ends of the third connecting rod and the fourth connecting rod are hingedly connected to the lower top plate.

[0014] Furthermore, the left-side connecting rod mechanism and the right-side connecting rod mechanism are both scissor-type lifting mechanisms, which include two connecting rods cross-connected by a hinge shaft, and the moving parts include a left sliding sleeve and a right sliding sleeve guided on the base rod. The corresponding connecting rods of the left-side connecting rod mechanism and the right-side connecting rod mechanism are connected to the corresponding sliding sleeves, and the component driving mechanism includes a driving cylinder or an electric push rod for driving the left slide and the right slide to move left and right.

[0015] The beneficial effects of the present invention are as follows: the torque wrench calibration device in the present invention is used to realize the connection between the torque wrench and the transmission shaft of the torque standard machine. When it is used, the left ends of the upper top plate and the lower top plate are extended into the transmission square hole of the transmission shaft, and the outer square head of the torque wrench is placed between the right ends of the upper clamping plate and the lower clamping plate. The torque wrench is in a vertical posture, and the upper top plate and the lower top plate are driven to move backward by the component driving mechanism, so that the upper top plate and the lower top plate are tightly fixed to the transmission square hole, and the component driving mechanism drives the upper clamping plate and the lower clamping plate to move relatively, and the upper clamping plate and the lower clamping plate are clamped and fixed to the outer square head of the torque wrench. Therefore, even if there is a matching tolerance between the outer square head and the transmission square hole, the torque wrench will not loosen, and the torque wrench can be ensured to be stably maintained in a vertical posture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a usage state diagram of embodiment 1 of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of the medium torque wrench calibration device; Figure 3 yes Figure 2 The diagram of the cooperation between the left friction disc and the right friction disc during contact transmission; Figure 4 is a schematic structural diagram of a torque wrench testing device in Embodiment 2 of the present invention; 1. Frame; 2. Motor; 3. Support balance device; 4. Wrench arm; 5. Torque wrench; 6. External square head; 7. Torque wrench calibration device; 8. Bearing seat; 9. Transmission shaft; 10. Lever; 11. Upper top plate; 12. First connecting rod; 13. Second connecting rod; 14. Left side screw sleeve; 15. Base rod; 16. Left side connecting rod mechanism; 17. Lower side top plate; 18. Third connecting rod; 19. Fourth connecting rod; 20. Guide rod; 21 1. Friction disc mounting plate; 22. Reset spring; 23. Left friction disc; 24. Mounting plate coil; 25. Friction disc coil; 26. Right friction disc; 27. Upper clamping plate; 28. Right connecting rod mechanism; 29. ​​Right screw sleeve; 30. Lower clamping plate; 31. External square head of base rod; 32. Driving cylinder; 33. Connecting rod; 34. Left sliding sleeve; 35. Right sliding sleeve; 36. Left fixed sleeve; 37. Right fixed sleeve; 38. Support rod. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0018] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0019] Embodiment 1 of a torque wrench calibration device on a torque standard machine of the present invention is as follows Figures 1 to 3 As shown: Before introducing the structure of the torque wrench calibration device, a simple structural introduction of a torque standard machine in the prior art is first given.

[0020] The torque standard machine includes a frame 1, on which is disposed a motor 2 capable of moving left and right, the power output end of the motor having a motor end transmission square hole, a bearing seat 8 being disposed on the frame on the left side of the motor, a transmission shaft 9 having a rotation axis extending along the left and right directions being rotatably mounted on the bearing seat, a transmission square hole being disposed at the right end of the transmission shaft 9, a force arm lever 10 extending along the front and rear directions being connected to the left end of the transmission shaft, and weights 39 being disposed at both ends of the force arm lever 10.

[0021] The torque standard machine also includes a supporting balance device 3 connected to the first transmission square hole, which is used to limit the front and rear sides of the wrench arm 4 of the torque wrench 5. The torque wrench includes a wrench arm and an outer square head 6 for outputting torque outward, all of which belong to the prior art.

[0022] The improvement of the present invention is that a torque wrench testing device 7 is designed to realize the connection between the transmission square hole of the transmission shaft and the torque wrench.

[0023] The torque wrench calibration device includes a base rod 15 whose axis extends in the left-right direction. In this embodiment, the base rod 15 is a screw rod with oppositely-directed threads at both ends. A base rod outer square head 31 for torque input is provided in the middle of the base rod. When in use, the base rod can be rotated by cooperating with a wrench and the base rod outer square head.

[0024] The torque wrench calibration device also includes a left-side top plate assembly and a right-side clamping plate assembly arranged on the left and right sides. The left-side top plate assembly includes an upper top plate 11 and a lower top plate 17 distributed on the upper and lower sides of the left end of the base rod. The left ends of the upper top plate 11 and the lower top plate 17 are used to extend into the transmission square hole on the transmission shaft. The right-side clamping plate assembly includes an upper clamping plate 27 and a lower clamping plate 30 distributed on the upper and lower sides of the base rod. The right ends of the upper clamping plate 27 and the lower clamping plate 30 are used to extend into the upper and lower sides of the outer square head of the torque wrench. The spacing between the upper clamping plate and the lower clamping plate is greater than the spacing between the upper top plate and the lower top plate.

[0025] The base rod is provided with a component driving mechanism for driving the upper top plate and the lower top plate to move back and move relative to each other, and for driving the upper clamping plate and the lower clamping plate to move back and move relative to each other. The component driving mechanism includes a moving part that can move left and right along the base rod, the moving part is connected to the upper top plate and the lower top plate through a left connecting rod mechanism, and the moving part is connected to the upper clamping plate and the lower clamping plate through a right connecting rod mechanism.

[0026] In the present embodiment, the left side connecting rod mechanism 16 and the right side connecting rod mechanism 28 are both parallelogram connecting rod mechanisms, the moving member includes a left side screw sleeve 14 threadedly connected to the left end of the base rod, and the moving member also includes a right side screw sleeve 29 threadedly connected to the right end of the base rod, and the threads of the left side screw sleeve 14 and the right side screw sleeve 29 are opposite. The left side connecting rod mechanism includes a top plate upper side connecting rod mechanism and a top plate lower side connecting rod mechanism, the top plate upper side connecting rod mechanism includes a first connecting rod 12 and a second connecting rod 13 arranged in parallel on the left and right sides, the upper ends of the first connecting rod and the second connecting rod are connected by hinge connection with the upper side top plate, and the lower ends of the first connecting rod and the second connecting rod are connected by hinge connection with the upper end of the left side screw sleeve 14; the top plate lower side connecting rod mechanism includes a third connecting rod 18 and a fourth connecting rod 19 arranged in parallel on the left and right sides, the upper ends of the third connecting rod and the fourth connecting rod are connected by hinge connection with the lower end of the left side screw sleeve, and the lower ends of the third connecting rod and the fourth connecting rod are connected by hinge connection with the lower side top plate. The right side connecting rod mechanism is similar to the left side connecting rod mechanism. The right side connecting rod mechanism includes the upper side connecting rod mechanism of the splint and the lower side connecting rod mechanism of the splint, which will not be described in detail here. The difference between the right side connecting rod mechanism and the left side connecting rod mechanism is that since the distance between the upper splint and the lower splint is greater than the distance between the upper top plate and the lower top plate, a support rod 38 capable of compensating for the height is provided on the right side screw sleeve, and the corresponding connecting rods of the upper side connecting rod mechanism of the splint and the lower side connecting rod mechanism of the splint are connected to the corresponding support rods.

[0027] In order to prevent the left top plate assembly and the right clamping plate assembly from rotating relative to the base rod during torque transmission, in the present invention, a left friction disc 23 is assembled on the right end of the upper top plate and the lower top plate along the left-right direction guide, a right friction disc 26 corresponding to the left friction disc is arranged on the upper clamping plate and the lower clamping plate, and a friction disc driving mechanism for driving the left friction disc to move left and right is arranged on the upper top plate and the lower top plate.

[0028] Specifically, a guide rod 20 with an axis extending in the left-right direction is fixed on the left friction disc, and a friction disc mounting plate 21 is provided at the right end of the upper top plate and the lower top plate. The guide rod 20 is guided and moved in the left-right direction and assembled on the friction disc mounting plate. The friction disc driving mechanism includes a reset tension spring 22 arranged between the right side of the friction disc mounting plate and the left side of the left friction disc. The friction disc driving mechanism also includes a mounting plate coil 24 arranged on the friction disc mounting plate and a friction disc coil 25 arranged on the left side of the left friction disc. When the mounting plate coil 24 and the friction disc coil 25 are energized, the adjacent ends of the mounting plate coil and the friction disc coil generate the same magnetic poles. When the mounting plate coil and the friction disc coil are not energized, the left friction disc moves to the left and separates from the right friction disc under the action of the reset tension spring. When the mounting plate coil and the friction disc coil are energized, the mounting plate coil and the friction disc coil generate a repulsive force, and the left friction disc moves to the right and contacts the right friction disc for transmission.

[0029] When in use, the torque wrench is in a vertical position, the left ends of the upper top plate and the lower top plate are inserted into the transmission square hole on the transmission shaft, and then the base rod is moved to the left as a whole, and the left ends of the upper top plate and the lower top plate are pressed against the bottom of the transmission square hole, and the upper top plate and the lower top plate are moved backwards until the upper top plate contacts the upper hole wall of the transmission square hole and the lower top plate contacts the lower hole wall of the transmission square hole, and then the upper clamping plate and the lower clamping plate are manually removed, and the outer square head of the torque wrench is inserted between the right ends of the upper clamping plate and the lower clamping plate, and the motor is moved. , locate the left and right positions of the torque wrench, and at the same time ensure that the bottom of the upper clamping plate contacts the top of the outer square head, and the top of the lower clamping plate contacts the bottom of the outer square head. Then you can use the wrench to apply torque to the base rod, the left screw sleeve moves to the left, and the right screw sleeve moves to the right. The upper top plate and the lower top plate have a tendency to move back and forth and press against the transmission square hole. The upper clamping plate and the lower clamping plate have a tendency to move relatively and clamp the outer square head. The outer square head and the transmission square hole are coaxially arranged. At this time, it can be ensured that the wrench arm of the torque wrench is in a standard vertical posture. Subsequently, when the mounting plate coil and the friction disc coil are energized, the mounting plate coil and the friction disc coil generate a repulsive force, and the left friction disc moves to the right and contacts the right friction disc for transmission, such as Figure 3 As shown, the torque wrench can be calibrated.

[0030] Embodiment 2 of a torque wrench calibration device on a torque standard machine Figure 4 As shown: Embodiment 2 is different from Embodiment 1 in that, in this embodiment, the base rod 15 is a square rod whose axis extends in the left-right direction, the left connecting rod mechanism 16 and the right connecting rod mechanism 28 are both scissor-type lifting mechanisms, the scissor-type lifting mechanism includes two connecting rods cross-connected by a hinge shaft, the moving part includes a left sliding sleeve 34 and a right sliding sleeve 35 which are guided and sleeved on the base rod, a left fixed sleeve 36 and a right fixed sleeve 37 are fixedly provided at both ends of the base rod, the corresponding connecting rods of the left connecting rod mechanism and the right connecting rod mechanism are connected to the corresponding sliding sleeves, the component driving mechanism includes a driving cylinder 32 (or an electric push rod) for driving the left slide and the right slide to move left and right, the piston rod of the driving cylinder is connected to the left sliding sleeve 34, the cylinder body of the driving cylinder is fixed on the base rod 15, the left sliding sleeve and the right sliding sleeve are connected by a connecting rod 33, so the left sliding sleeve and the right slide can move left and right synchronously.

[0031] The left side connecting rod mechanism includes an upper scissor lifting mechanism and a lower scissor lifting mechanism, the upper scissor lifting mechanism is connected between the upper top plate 11 and the left fixed sleeve 36 and the left sliding sleeve 34, and the lower scissor lifting mechanism is connected between the lower top plate 17 and the left fixed sleeve 36 and the left sliding sleeve 34. The right side connecting rod mechanism also includes an upper scissor lifting mechanism and a lower scissor lifting mechanism, and its specific structure is not described in detail.

[0032] For the upper scissor-type lifting mechanism and the lower scissor-type lifting mechanism of the left connecting rod mechanism, the lower end of one connecting rod is hingedly connected to the left fixed sleeve, and the lower end of the other connecting rod is connected to the left sliding sleeve.

[0033] When in use, the left ends of the upper top plate 11 and the lower top plate 17 are inserted into the transmission square hole of the transmission shaft, and the outer square head of the torque wrench is inserted between the right ends of the upper clamping plate 27 and the lower clamping plate 30, and the right end of the base rod is pressed against the left end surface of the outer square head. The piston rod of the drive cylinder is extended, and the left and right sliding sleeves move synchronously to the left, the upper top plate and the lower top plate move in opposite directions to press against the transmission square hole, and the upper clamping plate and the lower clamping plate move relatively to clamp the outer square head. Then, the plate coil and the friction disc coil are installed, and the left friction disc 23 moves to the right to contact the right friction disc 26, and the calibration of the torque wrench can be started.

[0034] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0035] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0036] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A torque wrench calibration device on a torque standard machine, characterized in that: It includes a base rod whose axis extends in the left and right directions, and also includes a left top plate assembly and a right clamping plate assembly arranged on the left and right sides. The left top plate assembly includes an upper top plate and a lower top plate distributed on the upper and lower sides of the base rod, and the left ends of the upper top plate and the lower top plate are used to extend into the transmission square hole on the transmission shaft. The right clamping plate assembly includes an upper clamping plate and a lower clamping plate distributed on the upper and lower sides of the base rod, and the right ends of the upper clamping plate and the lower clamping plate are used to extend into the upper and lower sides of the outer square head of the torque wrench. The base rod is provided with a component driving mechanism for driving the upper top plate and the lower top plate to move back and relative to each other, and for driving the upper clamping plate and the lower clamping plate to move back and relative to each other.

2. The torque wrench calibration device according to claim 1, characterized in that: A left friction disc is installed on the right end of the upper top plate and / or the lower top plate along the left-right direction guide, a right friction disc corresponding to the left friction disc is arranged on the upper clamping plate and / or the lower clamping plate, and a friction disc driving mechanism for driving the left friction disc to move left and right is arranged on the upper top plate and / or the lower top plate.

3. The torque wrench calibration device according to claim 2, characterized in that: A guide rod with an axis extending in the left-right direction is fixed on the left friction disc. The right end of the upper top plate and / or the lower top plate has a friction disc mounting plate. The guide rod is guided and moved in the left-right direction and assembled on the friction disc mounting plate.

4. The torque wrench calibration device according to claim 3, characterized in that: The friction disc drive mechanism includes a reset tension spring arranged between the right side surface of the friction disc mounting plate and the left side surface of the left friction disc. The friction disc drive mechanism also includes a mounting plate coil arranged on the friction disc mounting plate and a friction disc coil arranged on the left side of the left friction disc. When the mounting plate coil and the friction disc coil are energized, the adjacent ends of the mounting plate coil and the friction disc coil generate the same magnetic poles.

5. The torque wrench calibration device according to any one of claims 1 to 4, characterized in that: The component driving mechanism includes a moving part that can move left and right along the base rod. The moving part is connected to the upper top plate and the lower top plate through a left connecting rod mechanism, and is connected to the upper clamping plate and the lower clamping plate through a right connecting rod mechanism.

6. The torque wrench testing device according to claim 5, characterized in that: The base rod is a screw rod, and an outer square head of the base rod for torque input is arranged in the middle of the base rod. The left connecting rod mechanism and the right connecting rod mechanism are both parallelogram connecting rod mechanisms. The moving part includes a left screw sleeve threadedly connected to the left end of the base rod, and the moving part also includes a right screw sleeve threadedly connected to the right end of the base rod. The threads of the left screw sleeve and the right screw sleeve are opposite in direction.

7. The torque wrench testing device according to claim 6, characterized in that: The left-side connecting rod mechanism includes an upper connecting rod mechanism of the top plate and a lower connecting rod mechanism of the top plate. The upper connecting rod mechanism of the top plate includes a first connecting rod and a second connecting rod arranged in parallel on the left and right sides. The upper ends of the first connecting rod and the second connecting rod are hingedly connected to the upper top plate, and the lower ends of the first connecting rod and the second connecting rod are hingedly connected to the upper end of the left screw sleeve; the lower-side connecting rod mechanism of the top plate includes a third connecting rod and a fourth connecting rod arranged in parallel on the left and right sides. The upper ends of the third connecting rod and the fourth connecting rod are hingedly connected to the lower end of the left screw sleeve, and the lower ends of the third connecting rod and the fourth connecting rod are hingedly connected to the lower top plate.

8. The torque wrench testing device according to claim 4, characterized in that: The left-side connecting rod mechanism and the right-side connecting rod mechanism are both scissor-type lifting mechanisms. The scissor-type lifting mechanism includes two connecting rods cross-connected by a hinge shaft. The moving parts include a left sliding sleeve and a right sliding sleeve guided on the base rod. The corresponding connecting rods of the left-side connecting rod mechanism and the right-side connecting rod mechanism are connected to the corresponding sliding sleeves. The component driving mechanism includes a driving cylinder or an electric push rod that drives the left slide and the right slide to move left and right.

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