Torque screwdriver tester

Abstract

The present application relates to the technical field of testing instrument equipment, and discloses a torque screwdriver testing instrument, which comprises a base, a pair of positioning rods arranged on the base, a lifting plate slidingly installed on the positioning rods, a torque sensor arranged inside the base, a connecting block movably arranged on the base, a connecting shaft of the torque sensor being clamped and connected with the connecting block, a clamping block arranged at the top of the connecting block and used for connecting with the torque screwdriver, a first cloth reel and a second cloth reel arranged inside the base, a textile cloth being wound on the first cloth reel, the other end of the textile cloth being wound on the second cloth reel, a through slot being formed in the base, and the textile cloth passing through the through slot. The textile cloth compensates for the gap between the torque screwdriver and the clamping block, so that the inner hexagonal interface of the torque screwdriver is in close contact with the clamping block, the torque screwdriver and the torque sensor are synchronously loaded, and the accuracy of the testing result is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing instrument, in particular, to a torque screwdriver testing instrument. BACKGROUND

[0002] The torque screwdriver testing instrument is composed of a loading mechanism, a torque sensor, a data processing display and a clamp, which are responsible for receiving torque, converting mechanical signals, displaying numerical values and fixing the screwdriver respectively. The torque sensor has a connecting shaft at each end, and a hexagonal clamping block is usually arranged on one of the connecting shafts. When the torque screwdriver testing instrument is in use, the inner hexagonal interface of the torque screwdriver is clamped with the hexagonal clamping block, and after the torque screwdriver is fixed, the other connecting shaft of the torque sensor is loaded to generate torque between the hexagonal clamping block and the torque screwdriver. The torque screwdriver and the torque sensor both generate corresponding torque values in real time, and the torque values of the two are compared to complete the testing of the torque screwdriver.

[0003] The patent application with the patent publication number CN102419234A discloses a torque screwdriver testing instrument. When the testing instrument tests the torque screwdriver, the handle of the torque screwdriver is inserted between the left and right sliding blocks of the support, and the end of the screwdriver is inserted into the adapter connected with the torque sensor. Then, the perpendicularity of the screwdriver is adjusted by rotating the left and right rotating screws, and finally, the torque is slowly applied to the handle of the torque screwdriver to make the torque screwdriver rotate horizontally.

[0004] However, after the above-mentioned testing instrument is used for a long time, the inner hexagonal interface of the torque screwdriver is worn out. After the torque screwdriver is fixed on the testing instrument, there is a gap between the inner hexagonal interface of the torque screwdriver and the hexagonal adapter. After the connecting shaft of the torque sensor is loaded, the torque screwdriver is in an idle state for a short time, while the torque sensor itself has generated a torque value, which causes the detection result to be inaccurate. Therefore, we propose a torque screwdriver testing instrument. SUMMARY

[0005] The present application aims to provide a torque screwdriver testing instrument to solve the problems raised in the background.

[0006] In order to achieve the above-mentioned purpose, the present application provides a torque screwdriver testing instrument, which comprises a base, a pair of positioning rods arranged on the base, a lifting plate slidingly installed on the positioning rods, a torque sensor arranged inside the base, a connecting block movably arranged on the base, a connecting shaft of the torque sensor clamped and connected with the connecting block, and a clamping block arranged at the top end of the connecting block for connecting with a torque screwdriver.

[0007] The base is internally provided with a first cloth winding disc and a second cloth winding disc, the first cloth winding disc is wound with a textile cloth, the other end of the textile cloth is wound on the second cloth winding disc, a through slot is formed on the base, and the textile cloth passes through the through slot.

[0008] Optionally, a pair of supports are arranged inside the base, a rotating shaft is rotatably arranged on each of the supports, and the first cloth winding disc and the second cloth winding disc are detachably arranged on the rotating shafts.

[0009] Optionally, a support is arranged in the base, the torque sensor is arranged on the support, the connecting block is slidably connected with the connecting shaft of the torque sensor, a first compression spring is sleeved on the connecting shaft of the torque sensor, one end of the first compression spring is connected with the connecting block, the other end of the first compression spring is connected with the support, and a limiting plate is arranged on the connecting block.

[0010] Optionally, a plurality of pawls are hingedly arranged on the rotating shaft for arranging the second cloth winding disc, a rotating sleeve is rotatably arranged on the support, a ratchet wheel is arranged inside the rotating sleeve, and the ratchet wheel is movably connected with the pawls.

[0011] Optionally, a torsional spring is arranged inside the support, one end of the torsional spring is connected with the support, and the other end of the torsional spring is connected with the rotating sleeve.

[0012] Optionally, a push plate is arranged on the side of the rotating sleeve, an L-shaped rod is arranged on the side of the connecting block, and the other end of the L-shaped rod abuts against the push plate.

[0013] Optionally, a groove is formed in the clamping block, a spring sheet is arranged in the groove, the bottom end of the spring sheet is fixedly connected with the clamping block, and the top end of the spring sheet is located outside the groove in a normal state.

[0014] Optionally, an annular groove is formed in the end of the connecting block, a limiting ring is movably arranged in the annular groove, push rods are arranged on the two sides of the limiting ring, and the top end of the spring sheet is located in the groove when the limiting ring locks the spring sheet.

[0015] Optionally, a sleeve is sleeved on the positioning rod, the top end of the sleeve is connected with the lifting plate, a horizontal plate is arranged at the bottom end of the sleeve, a pair of fixing blocks are arranged at the bottom of the horizontal plate, a movable rod is slidably inserted into the fixing blocks, an abutting block is arranged at one end of the movable rod, the abutting block is arranged corresponding to the push rod, a second compression spring is sleeved on the movable rod, and the other end of the second compression spring is connected with the fixing block.

[0016] Optionally, a protruding strip is arranged on the side of the spring sheet away from the groove, the protruding strip is vertically arranged, and a plurality of protruding strips are arranged.

[0017] The technical effects and advantages of the present invention are as follows:

[0018] 1. After each calibration of the torque screwdriver, the No. 2 fabric reel on the rotating shaft rotates automatically, moving the next section of clean and intact textile fabric above the clamping block. When the torque screwdriver is installed on the calibration instrument, the lifting plate presses the hexagonal socket of the torque screwdriver against the clamping block. The textile fabric above the clamping block is pressed into the hexagonal socket of the torque screwdriver. The textile fabric compensates for the gap between the torque screwdriver and the clamping block, ensuring that the hexagonal socket of the torque screwdriver is in close contact with the clamping block. This ensures that the torque screwdriver and the torque sensor are loaded synchronously, reducing the occurrence of the torque screwdriver being unloaded when the torque sensor is loaded, and ensuring the accuracy of the calibration results.

[0019] 2. In addition, if the internal hexagonal interface of the torque screwdriver is worn significantly, relative movement may occur between the hexagonal interface and the locking block. The spring plate will automatically expand outward, and several protrusions on the side of the spring plate will press the textile fabric tightly against the inner wall of the hexagonal interface of the torque screwdriver. At the same time, the protrusions increase the torsional resistance between the hexagonal interface and the locking block, preventing relative rotation between the torque screwdriver and the locking block. This makes the torque value of the torque screwdriver closer to the loading value, further ensuring the accuracy of the calibration results. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 Appendix to this invention Figure 1 Enlarged structural diagram at point A;

[0023] Figure 3 This is a cross-sectional structural diagram of the base of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the base of the present invention;

[0025] Figure 5 This is a schematic diagram showing the positional structure of the ratchet and pawl of the present invention;

[0026] Figure 6 Appendix to this invention Figure 5 Enlarged structural diagram at point B;

[0027] Figure 7 This is a schematic cross-sectional view of the support structure of the present invention;

[0028] Figure 8The schematic diagram of the explosion structure of the spring sheet, the connecting block and the support of the present application;

[0029] Figure 9 The schematic diagram of the enlarged structure at C in the present application Figure 8 The schematic diagram of the enlarged structure at C in the present application

[0030] Figure 10 The schematic diagram of the shape change structure of the spring sheet of the present application before and after expansion.

[0031] The figure mark explanation: 101, base; 102, lifting plate; 103, sleeve; 104, horizontal plate; 1041, fixed block; 1042, movable rod; 1043, No. 2 compression spring; 1044, abutting block; 105, positioning rod; 106, through slot; 107, torque sensor; 108, support; 201, textile cloth; 202, support; 203, rotating shaft; 204, No. 1 cloth winding disc; 205, No. 2 cloth winding disc; 206, rotating sleeve; 207, ratchet wheel; 208, pawl; 209, push plate; 210, torsional spring; 301, connecting block; 302, limiting plate; 303, clamping block; 304, groove; 305, push rod; 306, No. 1 compression spring; 307, L-shaped rod; 308, annular groove; 309, convex strip; 310, spring sheet; 311, limiting ring. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "first", "second" are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, the following description refers to the drawings, and the same reference signs in different drawings represent the same or similar elements, which will not be described here in detail.

[0034] In the present scheme, unless otherwise expressly stated and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in the present scheme can be understood according to the specific circumstances.

[0035] According to some embodiments of the present scheme, a torque screwdriver tester is provided, as shown in Figures 1 to 10 The torque screwdriver tester includes a base 101, a pair of positioning rods 105 are arranged on the base 101, a lifting plate 102 is slidably installed on the positioning rods 105, a torque sensor 107 is arranged inside the base 101, and a threaded rod is further arranged on the base 101 in the prior art, the threaded rod is threadedly connected with the lifting plate 102, a handle is arranged at the top end of the threaded rod, and the threaded rod is rotated by rotating the handle to realize the up and down movement of the lifting plate 102.

[0036] In addition, a connecting block 301 is movably arranged on the base 101, the connecting block 301 is clamped and connected with a connecting shaft of the torque sensor 107, a clamping block 303 for connecting with the torque screwdriver is arranged at the top end of the connecting block 301, a first cloth reel 204 and a second cloth reel 205 are arranged inside the base 101, a textile cloth 201 is wound on the first cloth reel 204, the other end of the textile cloth 201 is wound on the second cloth reel 205, a through slot 106 is formed on the base 101, the textile cloth 201 passes through the through slot 106, and the textile cloth 201 at the suspended position is located above the clamping block 303.

[0037] In this way, when the torque screwdriver is installed on the tester, the tail of the torque screwdriver is in contact with the protrusion of the lifting plate 102, the internal hexagonal interface of the torque screwdriver is clamped with the clamping block 303, when the lifting plate 102 moves downward, the lifting plate 102 presses the internal hexagonal interface of the torque screwdriver and the clamping block 303, at the same time, the textile cloth 201 above the clamping block 303 is pressed into the internal hexagonal interface of the torque screwdriver, the textile cloth 201 compensates the gap between the torque screwdriver and the clamping block 303, so that the internal hexagonal interface of the torque screwdriver and the clamping block 303 are in close contact, and the condition that the torque screwdriver is in an empty load when the torque sensor 107 is loaded is reduced.

[0038] It should be noted that the torque screwdriver completes the verification work, the textile cloth 201 surface may be attached from the torque screwdriver oil stains, and the textile cloth 201 may be damaged, the oil stains and the damage will affect the next torque screw verification, therefore, after completing a verification work, the damaged or contaminated textile cloth 201 is wound on the second cloth reel 205 to be stored, and the next clean and complete textile cloth 201 is moved to the clamping block 303.

[0039] Specifically, please refer to Figure 3 The base 101 is internally provided with a pair of supports 202, and the shafts 203 are rotatably installed on the supports 202, respectively. The first cloth reel 204 and the second cloth reel 205 are detachably installed on the shafts 203, respectively.

[0040] In addition, the base 101 is provided with a bracket 108, and the torque sensor 107 is installed on the bracket 108. The connecting block 301 is slidably connected with the connecting shaft of the torque sensor 107, and the connecting block 301 can rotate synchronously with the connecting shaft of the torque sensor 107. The connecting block 301 can slide along the connecting shaft of the torque sensor 107. The connecting shaft of the torque sensor 107 is sleeved with a first compression spring 306. One end of the first compression spring 306 is connected with the connecting block 301, and the other end of the first compression spring 306 is connected with the bracket 108. The connecting block 301 is provided with a limiting plate 302.

[0041] In addition, please refer to Figure 5 , In addition, please refer to Figure 6 The shaft 203 for installing the second cloth reel 205 is hingedly provided with a plurality of pawls 208. The support 202 is rotatably provided with a rotating sleeve 206. The rotating sleeve 206 is internally provided with a ratchet wheel 207. The ratchet wheel 207 is movably connected with the pawl 208. It should be noted that the pawl 208 can be unidirectionally rotated through spring cooperation. Therefore, the ratchet wheel 207 and the pawl 208 can be unidirectionally connected. That is, the ratchet wheel 207 can only drive the shaft 203 to rotate through unidirectional rotation. The ratchet wheel 207 and the pawl 208 are common mechanical cooperation means. The specific structure and principle of the ratchet wheel 207 and the pawl 208 are well known to those skilled in the art, and will not be described here.

[0042] In addition, please refer to Figure 7 The support 202 is internally provided with a torsion spring 210. One end of the torsion spring 210 is connected with the support 202, and the other end of the torsion spring 210 is connected with the rotating sleeve 206. Please refer to Figure 6, the rotating sleeve 206 counterclockwise rotation, the ratchet 207 inside the rotating sleeve 206 and the pawl 208 does not engage, while the torsional spring 210 torsion, the torsional spring 210 release, the rotating sleeve 206 clockwise rotation, the ratchet 207 inside the rotating sleeve 206 and the pawl 208 engage, at this time the rotating sleeve 206 through the ratchet 207 and the pawl 208 with the carding belt driven rotating shaft 203.

[0043] In addition, please refer to Figure 6 , rotating sleeve 206 side provided with a push plate 209, the connecting block 301 side of the installation of L-shaped rod 307, L-shaped rod 307 the other end with the push plate 209 touch, therefore, the torque wrench in the installation of the tester, the torque wrench is pressed down by the lifting plate 102 at the same time, the torque wrench will be connected to the block 301 down, the connecting block 301 through the L-shaped rod 307 to the push plate 209 down, make the rotating sleeve 206 counterclockwise rotation, while the torsional spring 210 torsion, in the process, please refer to Figure 3 , the textile cloth 201 in the inverted V shape, with the connecting block 301 down, the textile cloth 201 becomes loose, prevent the textile cloth 201 due to the tightness of the pressure broken;

[0044] Please refer to Figure 5 , with the removal of the torque wrench, the connecting block 301 and L-shaped rod 307 under the action of the spring 306 reset, the push plate 209 lose the touch of the L-shaped rod 307, the torsional spring 210 release, the torsional spring 210 drive rotating sleeve 206 clockwise reverse, the ratchet 207 inside the rotating sleeve 206 and the pawl 208 engage, at this time the rotating sleeve 206 through the ratchet 207 and the pawl 208 with the carding belt driven rotating shaft 203 rotation, at the same time, the setting on the rotating shaft 203 on the second cloth reel 205 rotation, the second cloth reel 205 automatic winding of the textile cloth 201 used.

[0045] Through the above technical scheme, the torque wrench provided by the present application in the use of the torque wrench in the installation of the tester, the lifting plate 102 will be the torque wrench of the inner hexagonal interface and the block 303 compression, the textile cloth 201 above the block 303 is pressed into the torque wrench of the inner hexagonal interface, the textile cloth 201 between the torque wrench and the block 303 gap compensation, make the torque wrench of the inner hexagonal interface and the block 303 tight contact, ensure the torque wrench and the torque sensor 107 synchronous loading, reduce the torque sensor 107 loading, the torque wrench in the case of no load generated;

[0046] Moreover, after the torque screw is tested, the torsional spring 210 drives the rotating sleeve 206 to reverse clockwise, the ratchet 207 inside the rotating sleeve 206 is engaged with the pawl 208, at this time, the rotating sleeve 206 drives the rotating shaft 203 to rotate through the engagement of the ratchet 207 and the pawl 208, at the same time, the second cloth winding disc 205 arranged on the rotating shaft 203 rotates, the second cloth winding disc 205 automatically winds the used textile cloth 201, and the practicability of the device is increased.

[0047] It should be noted that the torque sensor 107 has a pair of connecting shafts, one of which is used to be connected with the torque screw (in the device, see Figure 8 , the connecting shaft is connected with the torque screw through the connecting block 301 and the clamping block 303), and the other is used for loading. In the prior art, a first bevel gear is arranged on the connecting shaft for loading, and a transmission rod is arranged in the base 101, one end of the transmission rod is provided with a handle, and the other end of the transmission rod is provided with a second bevel gear meshing with the first bevel gear. Therefore, the loading of the torque sensor 107 can be realized by manually rotating the handle. The specific structure and principle of the loading of the torque sensor 107 belong to the prior art means, and the specific structure and principle involved in the loading are well known to those skilled in the art, and will not be described here.

[0048] In some embodiments of the present scheme, as shown in Figure 8 , a recess 304 is formed in the clamping block 303, and a spring sheet 310 is arranged in the recess 304. The bottom end of the spring sheet 310 is fixedly connected with the clamping block 303. Under normal circumstances, the top end of the spring sheet 310 is located outside the recess 304.

[0049] In addition, an annular groove 308 is formed in the end of the connecting block 301, and a limiting ring 311 is movably arranged in the annular groove 308. The limiting ring 311 is provided with a push rod 305 on both sides. When the limiting ring 311 locks the spring sheet 310, the top end of the spring sheet 310 is located in the recess 304.

[0050] Please refer to Figure 2 , the positioning rod 105 is sleeved with a sleeve 103, the top end of the sleeve 103 is connected with the lifting plate 102, the bottom end of the sleeve 103 is provided with a horizontal plate 104, a pair of fixed blocks 1041 are arranged on the bottom of the horizontal plate 104, a movable rod 1042 is slidably inserted into the fixed blocks 1041, a resisting block 1044 is arranged at one end of the movable rod 1042, the edge of the resisting block 1044 is provided with a rounded corner, the resisting block 1044 is arranged corresponding to the push rod 305, a second compression spring 1043 is sleeved on the movable rod 1042, and the other end of the second compression spring 1043 is connected with the fixed block 1041.

[0051] In addition, the spring sheet 310 is provided with a convex strip 309 on the side away from the groove 304, the convex strip 309 is vertically arranged, the convex strip 309 is provided as a rubber strip, and the convex strip 309 is provided with a plurality of convex strips.

[0052] Therefore, if the inner hexagonal interface of the torque wrench is less worn, and if the gap between the inner hexagonal interface of the torque wrench and the clamping block 303 is small, when the torque wrench is installed on the calibrator, as the torque wrench moves downward, due to the presence of the textile cloth 201, the friction between the torque wrench hexagonal interface and the clamping block 303 is large, and the torque wrench hexagonal interface and the clamping block 303 do not move relative to each other, and the torque wrench pushes the clamping block 303 and the connecting block 301 to move downward synchronously, when the limiting plate 302 on the connecting block 301 abuts against the base 101, the clamping block 303 and the connecting block 301 stop moving, and as the torque wrench continues to move downward, the textile cloth 201 is compressed in the torque wrench hexagonal interface;

[0053] If the inner hexagonal interface of the torque wrench is more worn, and if the gap between the inner hexagonal interface of the torque wrench and the clamping block 303 is large, the textile cloth 201 is not enough to fill the gap between the torque wrench interface and the clamping block 303, and when the torque wrench is installed, before the top of the torque wrench inner hexagonal interface abuts against the top end of the clamping block 303, the abutting block 1044 is stationary, at this time, the torque wrench and the abutting block 1044 move downward relative to the clamping block 303, the abutting block 1044 abuts against the push rod 305, the push rod 305 drives the limiting ring 311 to move downward, the limiting ring 311 releases the locking of the spring sheet 310, the spring sheet 310 expands outward, and the convex strips 309 on the side of the spring sheet 310 compress the textile cloth 201 in the inner wall of the torque wrench hexagonal interface, and the convex strips 309 increase the torsional resistance of the torque wrench hexagonal interface and the clamping block 303, prevent relative rotation between the torque wrench and the clamping block 303, and make the torque value of the torque wrench closer to the loading value, thereby further ensuring the accuracy of the calibration result.

[0054] It should be noted that, as shown in Figure 2 , when the rounded corner of the abutting block 1044 abuts against the push rod 305, the abutting block 1044 itself moves to the left, and after the calibration work is completed, the abutting block 1044 is reset upward with the lifting plate 102, at this time, the rounded corner of the abutting block 1044 abuts against the push rod 305 again, the push rod 305 drives the limiting ring 311 to move upward and reset, and the limiting ring 311 locks the spring sheet 310 again.

[0055] The preferred embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0056] It should be further noted that the various technical features described in the above specific embodiments can be combined in any suitable manner, and in order to avoid unnecessary repetition, the various possible combinations of the technical features are not described again in the present scheme.

[0057] In addition, various different embodiments of the present scheme can also be combined with each other, as long as it does not deviate from the idea of the present scheme, it should also be considered as disclosed by the present scheme.

Claims

1. A torque screwdriver calibrator, comprising a base (101), wherein a pair of positioning rods (105) are disposed on the base (101), a lifting plate (102) is slidably mounted on the positioning rods (105), and a torque sensor (107) is disposed inside the base (101), characterized in that: A connecting block (301) is movably disposed on the base (101). The connecting block (301) is engaged with the connecting shaft of the torque sensor (107). A locking block (303) for connecting with a torque screwdriver is provided at the top of the connecting block (301). The base (101) is provided with a first fabric reel (204) and a second fabric reel (205). The first fabric reel (204) has a woven fabric (201) wound on it, and the other end of the woven fabric (201) is wound on the second fabric reel (205). The base (101) has a through groove (106) through which the woven fabric (201) passes.

2. The torque screwdriver calibrator according to claim 1, characterized in that: The base (101) has a pair of supports (202) inside, and a rotating shaft (203) is rotatably installed on the supports (202). The first fabric roll (204) and the second fabric roll (205) are detachably installed on the rotating shaft (203).

3. The torque screwdriver calibrator according to claim 1, characterized in that: A bracket (108) is installed in the base (101), and the torque sensor (107) is installed on the bracket (108). The connecting block (301) is slidably engaged with the connecting shaft of the torque sensor (107), and a compression spring (306) is sleeved on the connecting shaft of the torque sensor (107). One end of the compression spring (306) is connected to the connecting block (301), and the other end of the compression spring (306) is connected to the bracket (108). A limit plate (302) is installed on the connecting block (301).

4. A torque screwdriver calibrator according to claim 2, characterized in that: Multiple pawls (208) are hinged on the rotating shaft (203) used to install the second fabric roll (205). A rotating sleeve (206) is rotatably installed on the support (202). A ratchet (207) is provided inside the rotating sleeve (206). The ratchet (207) is engaged with the pawls (208).

5. A torque screwdriver calibrator according to claim 4, characterized in that: The support (202) is provided with a torsion spring (210), one end of which is connected to the support (202) and the other end of which is connected to the rotating sleeve (206).

6. A torque screwdriver calibrator according to claim 5, characterized in that: The rotating sleeve (206) is provided with a lever (209) on its side, and the connecting block (301) is provided with an L-shaped rod (307) on its side. The other end of the L-shaped rod (307) abuts against the lever (209).

7. A torque screwdriver calibrator according to claim 1, characterized in that: The card block (303) has a groove (304) and a spring sheet (310) is provided in the groove (304). The bottom end of the spring sheet (310) is fixedly connected to the card block (303). Under normal conditions, the top end of the spring sheet (310) is located outside the groove (304).

8. A torque screwdriver calibrator according to claim 7, characterized in that: The connecting block (301) has an annular groove (308) at its end. A limiting ring (311) is movably disposed in the annular groove (308). Push rods (305) are respectively installed on both sides of the limiting ring (311). When the limiting ring (311) locks the spring sheet (310), the top of the spring sheet (310) is located in the groove (304).

9. A torque screwdriver calibrator according to claim 8, characterized in that: A sleeve (103) is fitted on the positioning rod (105). The top end of the sleeve (103) is connected to the lifting plate (102). A horizontal plate (104) is installed at the bottom end of the sleeve (103). A pair of fixing blocks (1041) are provided at the bottom of the horizontal plate (104). A movable rod (1042) is slidably inserted in the fixing block (1041). A contact block (1044) is installed at one end of the movable rod (1042). The contact block (1044) is correspondingly arranged with the push rod (305). A second compression spring (1043) is fitted on the movable rod (1042). The other end of the second compression spring (1043) is connected to the fixing block (1041).

10. A torque screwdriver calibrator according to claim 9, characterized in that: The spring sheet (310) has a raised strip (309) on the side away from the groove (304). The raised strip (309) is vertically arranged and there are multiple raised strips (309).

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