Loading device and drawing test fixture

Abstract

The invention discloses a loading device and a drawing test fixture, and relates to the technical field of electronic product testing, and the loading device comprises a placing assembly, a clamping assembly and a control assembly. The placing assembly comprises a fixing plate, a placing plate and a control plate, and the fixing plate and the control plate are oppositely arranged on the placing plate to form a placing cavity for placing a to-be-tested piece; the clamping assembly comprises at least two clamping plates and at least two control rollers, all the control rollers movably penetrate through the control plate and are connected with the corresponding clamping plates, and all the clamping plates are arranged on the side, close to the fixing plate, of the control plate, so that all the control rollers can drive all the clamping plates to move between the fixing plate and the control plate when moving; the control assembly is arranged on the control panel and matched with the control rollers so as to control the control rollers to move synchronously relative to the control panel. According to the loading device, the technical problem of low test efficiency caused by the fact that each movable clamping plate needs to be operated independently is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product testing, and in particular to a loading device and a pulling test fixture. Background Art

[0002] At present, in the production process of electronic products such as computers or servers, the parts used to constitute the electronic products are usually fixed by glue. In order to ensure the quality of the manufactured electronic products such as computers or servers, it is necessary to test the bonding strength between the parts, and the bonding strength between the parts is usually tested by pulling.

[0003] The parts fixed by glue are called test pieces. In related technologies, the bonding strength of the test pieces is usually tested by a pull-out test fixture. The pull-out test fixture includes a carrier device and a pull-out test device. The carrier device mainly fixes the test piece by a fixed clamping plate and a movable clamping plate. The movable clamping plate can be slid relative to the fixed clamping plate. During the test, the test piece is first placed between the fixed clamping plate and the movable clamping plate, and then the test piece is fixed by the movable clamping plate and the fixed clamping plate. After the test piece is fixed, the bonding strength of the test piece can be tested by the pull-out test device.

[0004] In order to ensure the connection strength between the test piece and the loading device, so that the test piece is not easily separated from the loading device during the test, the sliding action of the movable clamping plate is generally performed under the action of the transmission mechanism. In actual use, it is found that there are generally multiple movable clamping plates, and each movable clamping plate needs to be adjusted separately, which will make the operation steps cumbersome, thereby affecting the test efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a loading device and a pulling test fixture, which solves the problem of low testing efficiency caused by the need to operate each movable clamping plate individually.

[0006] To achieve the above object, the present invention provides a loading device, comprising:

[0007] A placement assembly, the placement assembly comprising a fixing plate, a placement plate and a control plate, the fixing plate and the control plate being arranged on the placement plate opposite to each other to form a placement cavity for placing the test piece;

[0008] A clamping assembly, the clamping assembly comprising at least two clamping plates and at least two control rollers, each of the control rollers being movably disposed on the control plate and connected to the corresponding clamping plate, each of the clamping plates being disposed on a side of the control plate close to the fixed plate, so that each of the control rollers can respectively drive each of the clamping plates to move between the fixed plate and the control plate when moving;

[0009] A control component is arranged on the control board, and the control component cooperates with each of the control rollers to control each of the control rollers to move synchronously relative to the control board.

[0010] In some embodiments, the control component includes:

[0011] At least two control gears, each of which is rotatably disposed on the control plate, each of which can rotate relative to the control plate around an axis in a first direction, each of which is provided with a control thread groove, each of which is provided with a control external thread, and each of which is screwed into the corresponding control gear through a thread;

[0012] A synchronous toothed belt is meshed with each of the control gears to drive each of the control gears to rotate synchronously.

[0013] In some embodiments, each of the clamping plates is provided with a guide block, and the placement plate is provided with at least two guide grooves. Each of the guide blocks slides with the corresponding guide groove to limit the rotation of the corresponding clamping plate and the control roller, and enables the corresponding clamping plate to slide along the first direction.

[0014] In some embodiments, the control assembly further includes a control block, the control block is connected to a side of the synchronous toothed belt away from the control gear, and the control block is located on a side of the synchronous toothed belt close to the placement plate;

[0015] The control plate is provided with a control slot, the control block is slidably arranged in the control slot, and one end of the control block away from the fixed plate extends to the outside of the control slot, and the sliding of the control block drives the sliding of the synchronous toothed belt.

[0016] In some embodiments, the object loading device further comprises a sliding portion, the sliding portion is used to slide with the workbench, and the sliding portion is used to slide relative to the workbench along the first direction;

[0017] The placement plate is provided with a sliding plate, the sliding portion is provided with a sliding groove, and the sliding plate and the sliding groove are slidably matched to enable the placement component to slide relative to the sliding portion along a second direction perpendicular to the first direction.

[0018] In some embodiments, the placement plate is provided with an anti-slip groove, the anti-slip groove is U-shaped, and one end of the anti-slip groove extends toward the sliding plate and passes through the sliding plate;

[0019] A friction-enhancing soft strip is slidably arranged in the anti-slip groove. After sliding along the anti-slip groove, the friction-enhancing soft strip can abut against the inner wall of the sliding groove to lock the sliding of the sliding plate relative to the sliding part.

[0020] In some embodiments, a control sliding block is provided at one end of the friction-enhancing soft strip close to the control panel, and the other end of the anti-slip groove extends toward the control panel to be connected with the control groove, and the control sliding block is slidably disposed in the anti-slip groove, and the sum of the lengths of the control sliding block and the friction-enhancing soft strip is greater than the length of the anti-slip groove, so that the control sliding block can slide into the control groove.

[0021] In some embodiments, the control assembly further comprises an operating block, the operating block is slidably connected to the control block, the operating block is provided with an operating slide groove, and the operating block slides relative to the control block along a third direction perpendicular to both the first direction and the second direction through the operating slide groove;

[0022] An operating elastic member is provided on one side of the control block facing the placement plate, and the operating elastic member is used to provide elastic force to the operating block so that the operating block has a tendency to slide toward the placement plate and fit with the end of the control slider away from the friction-increasing soft strip.

[0023] In some embodiments, a limit block is provided on the control sliding block, and a limit groove is provided on the control plate. The limit block can be slidably disposed in the limit groove. A control elastic member is provided in the limit groove, and one end of the control elastic member is connected to the limit block, and the other end of the control elastic member is connected to the inner wall of the limit groove. The control elastic member is used to provide elastic force so that the limit block has a tendency to slide in a direction away from the placement plate.

[0024] In some embodiments, a fixing block is provided at one end of the sliding portion away from the control roller, and the fixing block is used to slidably cooperate with two clamping blocks provided on the workbench, and the fixing block is used to slide between the two clamping blocks along the first direction.

[0025] In some embodiments, positioning blocks are provided on both sides of the placement plate along the second direction, and the two positioning blocks are used to contact and fit with the sliding part after the sliding plate slides, so as to limit the sliding plate from separating from the sliding part.

[0026] In some embodiments, a slide rail is provided in the operating block, and a positioning groove for the slide rail to slide is provided on the control block. The slide rail cooperates with the positioning groove to guide the sliding of the operating block relative to the control block.

[0027] In some embodiments, a locking assembly is provided in the operating block, the locking assembly includes a locking block and a locking elastic member, the operating block is provided with a locking groove, the locking block is slidably arranged in the locking groove, the locking block is used to slide in the locking groove along the second direction, a control inclined surface is provided on the side of the locking block facing the control block, one end of the locking elastic member is connected to the inner wall of the locking groove, the other end of the locking elastic member is connected to the locking block, and the locking elastic member is used to provide elastic force to the locking block so that the locking block has a tendency to slide toward the outside of the locking groove;

[0028] The locking block is configured to slide to the outside of the locking groove under the elastic force of the locking elastic member, so as to limit the operation block from sliding toward the control slide block under the elastic force of the operation elastic member.

[0029] In some embodiments, an unlocking assembly is also provided on the operating block, and the unlocking assembly includes an unlocking block and an unlocking gear. The unlocking gear is rotatably arranged on the operating block, and the operating block is provided with an unlocking groove. The unlocking block is slidably arranged in the unlocking groove. The unlocking block is used to slide in the unlocking groove along the second direction. The unlocking gear is located between the unlocking block and the locking block. The unlocking block and the locking block are both provided with unlocking gear teeth that mesh with the unlocking gear. When the unlocking block slides, the locking block can slide under the gear transmission action of the unlocking gear to release the restriction of the locking block on the operating block.

[0030] In some embodiments, a protective film is further provided on the operating block, and the protective film is located on the outside of the unlocking block. The protective film is used to close the unlocking slot and to provide protection for the operator's hands.

[0031] The present invention provides a pulling test fixture, comprising any one of the above-mentioned loading devices, and further comprising a workbench, wherein the loading device can be movably arranged on the workbench.

[0032] In some embodiments, the pulling test fixture further includes two clamping blocks, the two clamping blocks are slidably disposed on the workbench, and the two clamping blocks are used to slide relative to the workbench along the second direction;

[0033] A rotating roller is rotatably connected to the workbench, and a first threaded hole and a second threaded hole are respectively provided on the two clamping blocks. The first threaded hole and the second threaded hole have opposite rotation directions. A rotating thread is provided on the rotating roller, and the rotating thread is threadably matched with the first threaded hole and the second threaded hole, so that the two clamping blocks can slide toward or away from each other when the rotating roller rotates.

[0034] In some embodiments, the pulling test fixture also includes a pulling test device, which includes a connecting block and a pulling mechanism. The connecting block is used to be connected to the workpiece to be tested by gluing, and a glue dispensing component for injecting glue is provided on the connecting block. A pulling hook is also slidably connected to the connecting block, and the pulling hook cooperates with the pulling mechanism to apply a pulling force to the workpiece to be tested.

[0035] Relative to the above background technology, the loading device provided in the embodiment of the present invention includes a placement component, a clamping component and a control component. Among them, the placement component includes a fixed plate, a placement plate and a control plate, and the fixed plate and the control plate are relatively arranged on the placement plate to form a placement cavity for placing the test piece; the clamping component includes at least two clamping plates and at least two control rollers, each of which can be movably passed through the control plate and connected to the corresponding clamping plate, and each clamping plate is arranged on the side of the control plate close to the fixed plate, so that each control roller can drive each clamping plate to move between the fixed plate and the control plate when it moves; the control component is arranged on the control plate, and the control component cooperates with each control roller to control each control roller to move synchronously relative to the control plate.

[0036] When performing a pull-out test on a workpiece, the workpiece needs to be placed between the clamping plate and the fixed plate, and the clamping plate is clamped by moving the clamping plate relative to the fixed plate. Specifically, the control assembly controls each control roller to slide synchronously relative to the control plate, so that each clamping plate slides synchronously toward the fixed plate, which facilitates the control of the sliding of each clamping plate to achieve the purpose of clamping the workpiece.

[0037] The beneficial effects of the load-carrying device thus arranged mainly include: compared with the traditional arrangement mode that requires individual adjustment of each movable clamping plate, the load-carrying device provided by the embodiment of the present invention controls the synchronous sliding of each control roller relative to the control plate through the control component, so that each clamping plate synchronously slides toward the fixed plate to clamp the test piece. By synchronously controlling the sliding of each clamping plate, the complexity of individually adjusting each clamping plate is reduced, making the operation simpler and faster, and reducing the time required for disassembly and assembly of the test piece, thereby effectively improving the work efficiency of the pull-out test; at the same time, since all the clamping plates move synchronously, this can ensure that the clamping force on the test piece is consistent, avoiding uneven clamping force caused by individual adjustment, thereby improving the test accuracy; in addition, by controlling the sliding of each clamping plate through the control component, this kind of automated synchronous control reduces the error of human operation and improves the repeatability and reliability of the pull-out test of the test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0039] FIG1 is a schematic structural diagram of a loading device according to an embodiment of the present invention;

[0040] FIG2 is a schematic diagram of the sliding control structure of each clamping plate in the object carrying device shown in FIG1;

[0041] FIG3 is a schematic diagram of the internal structure of the operating block when the sliding portion in FIG2 is unlocked;

[0042] FIG4 is a schematic diagram of the internal structure of the operating block when the sliding portion is locked in FIG2 ;

[0043] FIG5 is a side view of the operating block shown in FIG4;

[0044] FIG. 6 is a schematic diagram of the overall structure of a pulling test fixture in an embodiment of the present invention.

[0045] in:

[0046] 10-working table, 11-clamping block, 12-rotating roller;

[0047] 20-carrying device;

[0048] 21-placing assembly, 211-fixing plate, 212-placing plate, 2121-guide groove, 2122-anti-slip groove, 2123-sliding plate, 2124-positioning block, 213-control plate, 2131-control slide groove, 2132-limiting groove;

[0049] 22-clamping assembly, 221-clamping plate, 2211-guide block, 222-control roller;

[0050] 23-control assembly, 231-control gear, 2311-control thread groove, 232-synchronous toothed belt, 233-control block, 2331-positioning slide groove, 234-operating block, 2341-operating slide groove, 2342-slide rail, 2343-locking groove, 2344-unlocking groove, 235-operating elastic member, 236-locking block, 2361-control ramp, 237-locking elastic member, 238-unlocking block, 2381-unlocking elastic member, 239-unlocking gear, 2310-protective diaphragm;

[0051] 24-sliding portion, 241-sliding groove, 242-fixing block;

[0052] 25-friction-increasing soft strip;

[0053] 26-control slider, 261-limiting block;

[0054] 27- control elastic member;

[0055] 30-Pull-out test device, 31-Connecting block, 32-Glue dispensing assembly, 33-Hook. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0058] The object carrier 20 provided in the embodiment of the present invention is applied to a pulling test fixture to clamp a workpiece to be tested. The object carrier 20 can be movably disposed on a workbench 10 of the pulling test fixture.

[0059] Please refer to FIG. 1 and FIG. 2 together. The object carrying device 20 includes a placing component 21 , a clamping component 22 and a control component 23 .

[0060] The placement assembly 21 includes a fixing plate 211 , a placement plate 212 and a control plate 213 . The fixing plate 211 and the control plate 213 are disposed on the placement plate 212 opposite to each other to form a placement cavity for placing the test piece.

[0061] Specifically, the fixing plate 211, the placement plate 212 and the control plate 213 are arranged in a C shape as a whole, that is, the fixing plate 211 and the control plate 213 are located on the same end surface of the placement plate 212, and a placement cavity for placing the test piece is formed between the fixing plate 211 and the control plate 213.

[0062] The clamping assembly 22 includes at least two clamping plates 221 and at least two control rollers 222. Each control roller 222 is movably inserted into the control plate 213 and connected to the corresponding clamping plate 221. Each clamping plate 221 is arranged on one side of the control plate 213 close to the fixed plate 211, so that when each control roller 222 moves, it can drive each clamping plate 221 to move between the fixed plate 211 and the control plate 213.

[0063] Of course, according to actual needs, three control rollers 222 are provided, and three clamping plates 221 are provided accordingly. The three control rollers 222 are all provided perpendicular to the control plate 213 and are arranged along the length direction of the control plate 213. The three control rollers 222 can be slidably provided on the control plate 213 and slide in a direction perpendicular to the control plate 213. A clamping groove for the control roller 222 to slide is provided through the control plate 213. A clamping plate 221 is fixedly provided at one end of the control roller 222 facing the fixed plate 211. The clamping plate 221 and the fixed plate 211 can cooperate to clamp the workpiece to be tested. When the control roller 222 slides, it can drive the clamping plate 221 to slide between the fixed plate 211 and the control plate 213.

[0064] The control assembly 23 is arranged on the control board 213, and cooperates with each control roller 222 to control each control roller 222 to move synchronously relative to the control board 213. The control assembly 23 can be an assembly including a gear rack transmission mechanism, so that the three control rollers 222 can slide relative to the control board 213 by using the rack to drive the rotation of three gears; the control assembly 23 can also be an assembly including three electric push rods, which can be extended synchronously to synchronously push the three control rollers 222 to slide relative to the control board 213.

[0065] When performing a pull-out test on a workpiece to be tested, the workpiece to be tested needs to be placed between the clamping plate 221 and the fixed plate 211, and the clamping of the workpiece to be tested is achieved by moving the clamping plate 221 relative to the fixed plate 211. Specifically, the control assembly 23 controls each control roller 222 to slide synchronously relative to the control plate 213, so that each clamping plate 221 slides synchronously toward the fixed plate 211, which facilitates the control of the sliding of each clamping plate 221 to achieve the purpose of clamping the workpiece to be tested.

[0066] The beneficial effects of the load carrier 20 set up in this way mainly include: compared with the traditional setting mode that requires each movable clamping plate to be adjusted individually, the load carrier 20 provided by the embodiment of the present invention controls each control roller 222 to slide synchronously relative to the control plate 213 through the control component 23, so that each clamping plate 221 slides synchronously toward the fixed plate 211 to clamp the test piece. By synchronously controlling the sliding of each clamping plate 221, the complexity of individually adjusting each clamping plate 221 is reduced, making the operation simpler and faster, reducing the time required for disassembly and assembly of the test piece, thereby effectively improving the work efficiency of the pull-out test; at the same time, since all the clamping plates 221 act synchronously, it can ensure that the clamping force on the test piece is consistent, avoiding uneven clamping force caused by individual adjustment, thereby improving the test accuracy; in addition, by controlling the sliding of each clamping plate 221 through the control component 23, this kind of automatic synchronous control reduces the error of human operation and improves the repeatability and reliability of the pull-out test of the test piece.

[0067] In some embodiments, the control assembly 23 includes a synchronous toothed belt 232 and at least two control gears 231. According to the number of the control rollers 222, three are provided, and the number of the control gears 231 is also provided.

[0068] Please refer to Figure 2 as well. Each control gear 231 is rotatably provided on the control plate 213. Each control gear 231 can rotate relative to the control plate 213 around an axis in the first direction. Each control gear 231 is coaxially penetrated with a control thread groove 2311 that is connected to the clamping groove. The outer peripheral wall of the control roller 222 is provided with a control external thread that is threadably matched with the control thread groove 2311. When the control gear 231 rotates, the control roller 222 can slide relative to the control plate 213 under the action of the thread transmission.

[0069] The so-called first direction may be the X-axis direction as shown in FIG. 1 .

[0070] The synchronous toothed belt 232 meshes with each control gear 231 to drive each control gear 231 to rotate synchronously. When the synchronous toothed belt 232 slides on the control plate 213, it can drive the three control gears 231 to rotate synchronously, and the clamping plate 221 can slide synchronously toward the fixed plate 211, which is convenient for controlling the sliding of the clamping plate 221.

[0071] Furthermore, friction-increasing plates with a certain degree of deformation capability may be fixedly provided on the side of both the clamping plate 221 and the fixing plate 211 facing the workpiece to be tested. By providing the friction-increasing plates, on the one hand, the friction between the workpiece to be tested and the clamping plate 221 and the fixing plate 211 can be increased, thereby improving the reliability of clamping the workpiece to be tested by the clamping plate 221 and the fixing plate 211. On the other hand, the wear of the workpiece to be tested on the clamping plate 221 and the fixing plate 211 during the pulling test experiment can be reduced, thereby extending the service life of the carrier 20.

[0072] It can be understood that the rotation axes of the three control gears 231 are parallel to each other, the synchronous toothed belt 232 is a closed-loop structure, and the inner wall of the synchronous toothed belt 232 is provided with gear teeth meshing with the three control gears 231. In this way, the three control gears 231 can be driven to rotate synchronously by simply pushing the synchronous toothed belt 232 to slide relative to the control plate 213, thereby achieving the purpose of synchronously driving the three control rollers 222 to slide.

[0073] In some embodiments, each clamping plate 221 is provided with a guide block 2211 at one end facing the placement plate 212, and the placement plate 212 is provided with at least two guide grooves 2121. Each guide block 2211 is slidably matched with the corresponding guide groove 2121 to limit the rotation of the corresponding clamping plate 221 and the control roller 222, and enable the corresponding clamping plate 221 to slide along the first direction.

[0074] In this way, with the cooperation of the guide block 2211 and the guide groove 2121, the corresponding clamping plate 221 and the control roller 222 can be limited in their overall rotation. When the control gear 231 rotates, the control roller 222 is not easy to rotate along with the rotation of the control gear 231, thereby improving the reliability of the control roller 222 sliding by the rotation of the control gear 231.

[0075] In some embodiments, the control assembly 23 further includes a control block 233 , which is connected to a side of the synchronous belt 232 away from the control gear 231 , and is located on a side of the synchronous belt 232 close to the placement plate 212 .

[0076] In order to facilitate the control of the sliding of the clamping plate 221, a control groove 2131 is provided on the control plate 213, and the control block 233 is slidably arranged in the control groove 2131. The control block 233 extends to the outside of the control groove 2131 at one end away from the fixed plate 211. The sliding of the control block 233 can drive the sliding of the synchronous toothed belt 232, thereby controlling the sliding of the roller 222, which is convenient for controlling the sliding of the clamping plate 221.

[0077] In some embodiments, the loading device 20 further includes a sliding portion 24 , which is located between the workbench 10 and the placement plate 212 . The sliding portion 24 is slidably connected to the workbench 10 , and is used to slide relative to the workbench 10 along a first direction.

[0078] The placement component 21 is slidably arranged on the sliding portion 24. For this purpose, a sliding plate 2123 is provided on the placement plate 212. For example, the sliding plate 2123 is integrally formed on the side walls on both sides of the placement plate 212. The sliding portion 24 is provided with a sliding groove 241. The sliding groove 241 is arranged in a T shape. The opening of the sliding groove 241 is toward the end of the sliding portion 24 away from the workbench 10. Through the cooperation between the sliding plate 2123 and the sliding groove 241, the placement component 21 slides relative to the sliding portion 24 along a second direction perpendicular to the first direction, and the placement plate 212 is not easy to slide in the direction away from the workbench 10.

[0079] The so-called second direction may be the Y-axis direction as shown in FIG. 1 .

[0080] It should be noted that, regarding the movement in the X-axis direction: the sliding portion 24 is used to move the test piece to the bottom of the pulling test device 30 of the pulling test fixture, and there is no need to move the pulling test device 30, which is convenient for clamping different test pieces, thereby facilitating pulling tests on different items; regarding the movement in the Y-axis direction, since the clamping component 22 clamps the test piece, the relative position of the pulling test device and the test piece can be changed by sliding the placement component 21 relative to the sliding portion 24 in the Y-axis direction. By adjusting the position of the clamping component 22 in the Y-axis direction, testing of different positions on the same surface of the test piece can be achieved without reloading the test piece, thereby improving the efficiency and safety of the pulling test and the comparability of test results at different test positions on the same surface.

[0081] In some embodiments, positioning blocks 2124 are provided on both sides of the placement plate 212 along the second direction. The positioning blocks 2124 and the placement plate 212 can be fixed by bolts. Both ends of the positioning blocks 2124 extend toward the corresponding sliding plates 2123. The two positioning blocks 2124 are used to contact and fit with the sliding part 24 after the sliding plate 2123 slides, so as to limit the sliding plate 2123 from separating from the sliding part 24.

[0082] By providing positioning blocks 2124 on both sides of the placement plate 212 along the second direction, the placement plate 212 is not easily slid to be separated from the sliding portion 24 , thereby improving the reliability of the object carrying device 20 being slidably disposed on the sliding portion 24 .

[0083] In some embodiments, a fixed block 242 is provided at one end of the sliding portion 24 facing the workbench 10 (or away from the control roller 222), and clamping blocks 11 are provided on both sides of the fixed block 242 along the second direction. The fixed block 242 is used to slidably cooperate with two clamping blocks 11 provided on the workbench 10 (specifically, it can be slidably arranged between the two clamping blocks 11), and the clamping blocks 11 located on both sides of the fixed block 242 cooperate to clamp the fixed block 242, and the fixed block 242 is used to slide relative to the two clamping blocks 11 along the first direction.

[0084] In some embodiments, a locking mechanism for locking the sliding plate 2123 may be further provided on the placement assembly 21 , and the locking mechanism includes a friction-enhancing soft strip 25 slidably provided on the placement plate 212 .

[0085] Furthermore, the placement plate 212 is provided with an anti-slip groove 2122 for the friction-enhancing soft strip 25 to slide, and the anti-slip groove 2122 is arranged in a U-shape, and one end of the anti-slip groove 2122 extends toward the sliding plate 2123 and penetrates the sliding plate 2123; the friction-enhancing soft strip 25 is slidingly arranged in the anti-slip groove 2122, and the friction-enhancing soft strip 25 can be pressed against the inner wall of the sliding groove 241 after sliding along the anti-slip groove 2122, so as to lock the sliding of the sliding plate 2123 relative to the sliding part 24.

[0086] It can be seen that the friction between the friction-enhancing soft strip 25 and the sliding part 24 can lock the sliding of the sliding plate 2123 relative to the sliding part 24, so that the placement component 21 is not easy to slide relative to the sliding part 24 without the action of other external forces.

[0087] In some embodiments, a control slider 26 is provided at one end of the friction-enhancing soft strip 25 close to the control board 213. The control slider 26 is not deformable, and the friction-enhancing soft strip 25 has a certain deformation ability. The other end of the anti-slip groove 2122 extends toward the control board 213 to be connected with the control groove 2131. The control slider 26 is slidably disposed in the anti-slip groove 2122. The sum of the lengths of the control slider 26 and the friction-enhancing soft strip 25 is greater than the length of the anti-slip groove 2122, so that the control slider 26 can slide into the control groove 2131.

[0088] In some embodiments, a limit block 261 is provided on the control sliding block 26, a limit groove 2132 is provided on the control plate 213, the limit block 261 is slidably disposed in the limit groove 2132, and a control elastic member 27 is provided on the control plate 213 for pushing the limit block 261 to slide in a direction away from the placement plate 212 (or in a direction close to the control block 233), and the control elastic member 27 is located in the limit groove 2132.

[0089] In this embodiment, the control elastic member 27 is specifically a control spring, one end of which is connected to the limit block 261, and the other end of which is connected to the inner wall of the limit groove 2132. The control elastic member 27 is used to provide elastic force so that the limit block 261 has a tendency to slide in a direction away from the placement plate 212. In this way, without the action of other external forces, part of the control slide block 26 is located in the control slide groove 2131 and the friction-increasing soft strip 25 is stored in the anti-slip groove 2122.

[0090] In some embodiments, the control component 23 also includes an operating block 234, which is slidably connected to the control block 233. One end of the control block 233 away from the synchronous toothed belt 232 is slidably connected to the operating block 234. The operating block 234 is provided with an operating groove 2341. The operating block 234 slides relative to the control block 233 along a third direction perpendicular to both the first direction and the second direction through the operating groove 2341.

[0091] The so-called third direction may be the Z-axis direction as shown in FIG. 1 .

[0092] In addition, an operating elastic member 235 for pushing the operating block 234 to slide toward the placing plate 212 is provided on the side of the control block 233 facing the placing plate 212. In the present embodiment, the operating elastic member 235 is specifically an operating spring, one end of which is fixed to the control block 233, and the other end of which is fixed to the operating block 234. The operating spring is used to provide an elastic force to the operating block 234 so that the operating block 234 has a tendency to slide toward the placing plate 212 and fit with one end of the control sliding block 26 away from the friction-increasing soft strip 25.

[0093] The operating block 234 is arranged in an L shape, and one end of the operating block 234 parallel to the fixed block 242 extends toward the control slide groove 2131. Under the action of the operating spring, the operating block 234 fits with the end of the control slide block 26 away from the friction-increasing soft strip 25, which not only makes the control slide block 26 received in the anti-slip groove 2122 under the action of force, locking the sliding plate 2123 relative to the sliding portion 24, but also can lock the operating block 234 through the friction between the control slide block 26 and the operating block 234, driving the control block 233 to slide along the control slide groove 2131, thereby ensuring the reliability of clamping the test piece by the clamping assembly 22.

[0094] When the operating block 234 slides in the direction away from the placement plate 212, the limit block 261 can, under the action of the control spring, drive the control slide block 26 to slide toward the control slide groove 2131 until the lock of the sliding plate 2123 relative to the sliding part 24 by the friction-enhancing soft strip 25 is released. At this time, the operating block 234 is separated from the control slide block 26, and the lock on the operating block 234 driving the control block 233 to slide along the control slide groove 2131 is also released.

[0095] To sum up, when conducting a pull-out test experiment on the workpiece to be tested, the workpiece to be tested is first placed between the clamping plate 221 and the fixed plate 211, and then the operating block 234 is driven to slide in the direction away from the placement plate 212, and the external force control on the control slide block 26 is released, so that the control slide block 26 can slide in the direction away from the placement plate 212 under the action of the control spring. At this time, the friction-increasing soft strip 25 is received in the anti-slip groove 2122, and then the control block 233 can be driven by the operating block 234 to slide along the control slide groove 2131. When the control block 233 slides, it can drive the synchronous toothed belt 232 to slide, and the sliding of the synchronous toothed belt 232 can drive the control gear 231 to rotate. When the control gear 231 rotates, it can make the control roller 222 slide under the action of the threaded transmission, so that the workpiece to be tested can be clamped by the clamping plate 221. After the control of the operating block 234 is released, the operating block 234 can slide toward the direction of the placement plate 212 under the action of the operating spring to the control slide block 26 and be received in the anti-slip groove 2122. At this time, the friction-increasing soft strip 25 slides to be tightly pressed against the inner wall of the sliding groove 241, synchronously locking the sliding of the sliding plate 2123 and the operating block 234.

[0096] In some embodiments, a control module and a drive module may also be provided. The drive module may be an electric push rod or a hydraulic cylinder. The control module is communicatively connected to the drive module. The control module is used to send control instructions to the drive module to control the slippage of the synchronous toothed belt 232. The slippage of the synchronous toothed belt 232 can drive the control gear 231 to rotate. When the control gear 231 rotates, the control roller 222 can slide under the action of the threaded transmission, so that the test piece can be clamped by the clamping plate 221.

[0097] Furthermore, a test piece detection module can also be provided, and the test piece detection module is arranged on the placement plate 212. The test piece detection module is used to detect whether the test piece is placed in place. The test piece detection module is communicatively connected with the control module. The test piece detection module can be a visual module with a camera or a gravity sensor. When the test piece is placed on the placement plate 212, the test piece detection module is used to send a test piece in place signal to the control module, so that the control module controls the drive module to move, thereby driving the clamping plate 221 to move toward the fixed plate 211.

[0098] Furthermore, a clamping force detection component, such as a stress strain gauge, may also be provided on the fixed plate 211 and / or the clamping plate 221. After the clamping plate 221 and the fixed plate 211 clamp the test piece, the clamping force detection component can detect the clamping force applied by the clamping plate 221 and the fixed plate 211 to the test piece. In order to ensure the connection strength between the test piece and the carrier 20 so that the test piece is not easily separated from the carrier 20 during the test, it is necessary to make the clamping force applied by the clamping plate 221 and the fixed plate 211 to the test piece reach a set threshold. Therefore, when the clamping force detected by the clamping force detection component reaches the set threshold, the clamping force detection component feeds back a signal to the control module. After receiving the signal, the control module controls the driving module to stop the action.

[0099] Such a setting can not only ensure the connection strength between the piece to be tested and the loading device 20, so that the piece to be tested is not easily separated from the loading device 20 during the test, but also prevent the clamping plate 221 and the fixing plate 211 from applying too much clamping force to the piece to be tested, thereby preventing the piece to be tested from being damaged, which is beneficial to improving the service life of the piece to be tested.

[0100] Please refer to Figures 3 and 4 together. A slide rail 2342 is provided in the operating block 234, and a positioning groove 2331 for the slide rail 2342 to slide is provided on the control block 233. The slide rail 2342 cooperates with the positioning groove 2331 to guide the sliding of the operating block 234 relative to the control block 233.

[0101] In order to facilitate the installation of the control block 233 into the operating block 234, the distance between the bottom of the slide rail 2342 and the bottom wall of the operating block 234 is set to be greater than the thickness of the control block 233, and a guide arc surface is provided at one end of the slide rail 2342 facing the bottom wall of the operating block 234. The setting of the guide arc surface facilitates the operating block 234 to slide onto the slide rail 2342 and embed into the positioning groove 2331, thereby facilitating the assembly of the device.

[0102] Among them, after the guide arc surface is set, the overall area of ​​the guide arc surface will be smaller than the cross-section of the hole to be embedded, which plays a guiding role and facilitates the slide rail 2342 to be embedded in the positioning slide groove 2331. The guide arc surface can be a circular arc surface.

[0103] In some embodiments, a locking component is provided in the operating block 234 for locking the sliding of the operating block 234 relative to the control block 233. By setting the locking component, the operating block 234 can remain separated from the control slide block 26. In actual use, it is convenient to drive the control block 233 to slide by controlling the sliding of the operating block 234, and it is convenient to adjust the positional relationship between the sliding portion 24 and the placement component 21 at any time before conducting a test, which is convenient for early test preparation.

[0104] Specifically, the locking assembly includes a locking block 236 and a locking elastic member 237. The operation block 234 is provided with a locking groove 2343. The locking block 236 is slidably disposed in the locking groove 2343. The locking block 236 is used to slide in the locking groove 2343 along the second direction. The locking block 236 is provided with a control inclined surface 2361 on the side facing the control block 233. When the operation block 234 slides to the sliding portion 24 in a locked state, the locking block 236 is located on the side of the control block 233 facing the control slide 26. One end of the locking elastic member 237 is connected to the inner wall of the locking groove 2343, and the other end of the locking elastic member 237 is connected to the locking block 236. The locking elastic member 237 is used to provide elastic force to the locking block 236 so that the locking block 236 has a tendency to slide toward the outside of the locking groove 2343.

[0105] It can be seen that the locking block 236 is configured to slide to the outside of the locking groove 2343 under the elastic force of the locking elastic member 237 to limit the sliding of the operating block 234 toward the control slide block 26 under the elastic force of the operating elastic member 235 .

[0106] Of course, according to actual needs, the locking elastic member 237 can be a locking spring.

[0107] It can be understood that in the process of the operating block 234 sliding in the direction away from the control slider 26 until it is separated from the control slider 26, the operating block 234 first slides to the control block 233 and fits the control inclined surface 2361, and then as the operating block 234 slides, the locking block 236 first slides toward the locking groove 2343 under the action of the control block 233; when the operating block 234 slides to the control block 233 and is located on the side of the locking block 236 facing the control slider 26, the locking block 236 can slide out of the locking groove 2343 under the action of the locking spring; through the setting of the locking block 236, the operating block 234 is restricted from sliding toward the control slider 26 under the action of the operating spring.

[0108] In this embodiment, two groups of locking components are provided, and the two groups of locking components are symmetrically arranged inside the operating block 234. This arrangement improves the reliability of limiting the sliding of the operating block 234 relative to the control block 233 through the locking block 236.

[0109] In some embodiments, the operating block 234 is also provided with an unlocking component for releasing the restriction of the locking block 236 on the control block 233, and the unlocking component includes an unlocking block 238 and an unlocking gear 239. The unlocking gear 239 is rotatably arranged on the operating block 234, and a rotating groove for the unlocking gear 239 to rotate is correspondingly provided on the operating block 234. The operating block 234 is provided with an unlocking groove 2344, and the unlocking block 238 is slidably arranged in the unlocking groove 2344. The unlocking block 238 is used to slide in the unlocking groove 2344 along a second direction. The sliding directions of the unlocking block 238 and the locking block 236 are opposite, and the unlocking gear 239 is located between the unlocking block 238 and the locking block 236. The unlocking block 238 and the locking block 236 are both provided with unlocking gear teeth meshing with the unlocking gear 239. When the unlocking block 238 slides, the locking block 236 can slide under the gear transmission action of the unlocking gear 239 to release the restriction of the locking block 236 on the operating block 234.

[0110] Furthermore, the operating block 234 is also provided with an unlocking elastic member 2381 for driving the unlocking block 238 to slide toward the outside of the unlocking groove 2344, which is specifically an unlocking spring. The setting of the unlocking spring can improve the reliability of the reset of the unlocking block 238. One end of the unlocking spring is fixed to the unlocking groove 2344, and the other end of the unlocking spring is fixed to the unlocking block 238.

[0111] Through the above arrangement, the two unlocking blocks 238 are located on both sides of the operating block 234. In the actual operation process, the operator only needs to place his fingers at the unlocking blocks 238 on both sides of the operating block 234, and then pinch the operating block 234 to make the unlocking blocks 238 on both sides of the operating block 234 slide to be stored in the unlocking groove 2344, which does not affect the normal operation of controlling the sliding of the operating block 234, facilitates the use of the device, and when there is no need to release the lock block 236 from locking the control block 233, it is only necessary to avoid the position of the unlocking block 238 during the operation process, and the position of the unlocking block 238 can be judged by touch without additional observation.

[0112] Please refer to FIG. 5 , a protective film 2310 is also provided on the operating block 234 . The protective film 2310 is located outside the unlocking block 238 . The protective film 2310 is used to close the unlocking slot 2344 and to provide protection for the operator's hands.

[0113] It can be seen that the unlocking block 238 is located between the protective diaphragm 2310 and the operating block 234. The protective diaphragm 2310 is made of a material with certain supporting properties and not easy to deform. In this embodiment, the protective diaphragm 2310 is made of rubber material. Through the setting of the protective diaphragm 2310, on the one hand, the unlocking block 238 is prevented from being pushed by accidental touch. On the other hand, when the operator pushes the unlocking block 238, it can provide protection for the operator's hands and reduce the pressure of the unlocking block 238 on the hands.

[0114] Compared with the traditional setting mode that requires individual adjustment of each movable clamping plate, the loading device 20 provided in the embodiment of the present invention controls each control roller 222 to slide synchronously relative to the control plate 213 through the control component 23, so that each clamping plate 221 slides synchronously toward the fixed plate 211 to clamp the test piece. By synchronously controlling the sliding of each clamping plate 221, the complexity of individually adjusting each clamping plate 221 is reduced, making the operation simpler and faster, and reducing the time required for disassembly and assembly of the test piece, thereby effectively improving the work efficiency of the pull-out test; at the same time, since all the clamping plates 221 act synchronously, it can ensure that the clamping force on the test piece is consistent, avoiding uneven clamping force caused by individual adjustment, thereby improving the test accuracy; in addition, by controlling the sliding of each clamping plate 221 through the control component 23, this kind of automatic synchronous control reduces the error of human operation and improves the repeatability and reliability of the pull-out test of the test piece.

[0115] Moreover, when the operation block 234 slides in the direction away from the placement plate 212, the limit block 261 can drive the control slider 26 to slide in the control slot 2131 under the action of the control spring until the locking of the sliding plate 2123 relative to the sliding portion 24 by the friction-increasing soft strip 25 is released. At this time, the operation block 234 is separated from the control slider 26, and the locking of the sliding of the control block 233 along the control slot 2131 driven by the operation block 234 is also released. In the absence of other external forces, the operation block 234 is pressed against the inner wall of the control slot 2131 under the action of the operation spring, so that the control slider 26 is received in the anti-slip slot 2122 under the action of the force. At this time, the friction-increasing soft strip 25 slides to press against the inner wall of the sliding slot 241, thereby synchronously locking the sliding of the sliding plate 2123 relative to the sliding portion 24 and the sliding of the operation block 234 relative to the control plate 213.

[0116] Please refer to FIG. 6 . The pull-out test fixture provided in the embodiment of the present invention is used to perform a pull-out test experiment on a workpiece to be tested (not shown in the figure). The pull-out test fixture includes a workbench 10 , a loading device 20 , and a pull-out test device 30 from bottom to top.

[0117] The workbench 10 is used as a bottom platform of the fixture to support the object carrier 20 and the pulling test device 30 . The object carrier 20 is movably disposed on the workbench 10 .

[0118] In some embodiments, the pulling test fixture further includes two clamping blocks 11 , which are slidably disposed on the workbench 10 , and the two clamping blocks 11 are used to slide relative to the workbench 10 along the second direction.

[0119] To facilitate the sliding of the two clamping blocks 11, a rotating roller 12 is rotatably connected to the workbench 10. The two clamping blocks 11 are respectively provided with a first threaded hole and a second threaded hole. The rotation directions of the first threaded hole and the second threaded hole are opposite. A rotating thread is provided on the rotating roller 12, and the rotating thread cooperates with the first threaded hole and the second threaded hole. In this way, when the rotating roller 12 rotates, the two clamping blocks 11 can slide toward or away from each other.

[0120] The pulling test device 30 also includes a connecting block 31 and a pulling mechanism. The connecting block 31 is used to connect to the test piece by gluing. The connecting block 31 is provided with a glue dispensing component 32 for injecting glue. The connecting block 31 is also slidably connected with a hook 33. The hook 33 cooperates with the pulling mechanism to apply a pulling force to the test piece.

[0121] The pulling mechanism may be a tension sensor, and the pull hook 33 cooperates with the tension sensor to perform a pulling test on the workpiece by lifting the entire jig.

[0122] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0123] The above is a detailed introduction to the loading device and the pulling test fixture provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the scheme of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A loading device, characterized in that: include: A placement assembly, the placement assembly comprising a fixing plate, a placement plate and a control plate, the fixing plate and the control plate being arranged on the placement plate opposite to each other to form a placement cavity for placing the test piece; A clamping assembly, the clamping assembly comprising at least two clamping plates and at least two control rollers, each of the control rollers being movably disposed on the control plate and connected to the corresponding clamping plate, each of the clamping plates being disposed on a side of the control plate close to the fixed plate, so that each of the control rollers can respectively drive each of the clamping plates to move between the fixed plate and the control plate when moving; A control component is arranged on the control board, and the control component cooperates with each of the control rollers to control each of the control rollers to move synchronously relative to the control board.

2. The object loading device according to claim 1, characterized in that: The control component comprises: At least two control gears, each of which is rotatably disposed on the control plate, each of which can rotate relative to the control plate around an axis in a first direction, each of which is provided with a control thread groove, each of which is provided with a control external thread, and each of which is screwed into the corresponding control gear through a thread; A synchronous toothed belt is meshed with each of the control gears to drive each of the control gears to rotate synchronously.

3. The object loading device according to claim 2, characterized in that: Each of the clamping plates is provided with a guide block, and the placement plate is provided with at least two guide grooves. Each of the guide blocks slidably cooperates with the corresponding guide groove to limit the rotation of the corresponding clamping plate and the control roller, and enables the corresponding clamping plate to slide along the first direction.

4. The loading device according to claim 2, characterized in that: The control assembly further includes a control block, which is connected to a side of the synchronous toothed belt away from the control gear, and is located on a side of the synchronous toothed belt close to the placement plate; The control plate is provided with a control slot, the control block is slidably arranged in the control slot, and one end of the control block away from the fixed plate extends to the outside of the control slot, and the sliding of the control block drives the sliding of the synchronous toothed belt.

5. The object loading device according to claim 4, characterized in that: The object carrying device further comprises a sliding portion, the sliding portion is used for slidingly cooperating with the workbench, and the sliding portion is used for sliding relative to the workbench along the first direction; The placement plate is provided with a sliding plate, the sliding portion is provided with a sliding groove, and the sliding plate and the sliding groove are slidably matched to enable the placement component to slide relative to the sliding portion along a second direction perpendicular to the first direction.

6. The object loading device according to claim 5, characterized in that: The placement plate is provided with an anti-slip groove, the anti-slip groove is U-shaped, and one end of the anti-slip groove extends toward the sliding plate and passes through the sliding plate; A friction-enhancing soft strip is slidably arranged in the anti-slip groove. After sliding along the anti-slip groove, the friction-enhancing soft strip can abut against the inner wall of the sliding groove to lock the sliding of the sliding plate relative to the sliding part.

7. The object loading device according to claim 6, characterized in that: A control slider is provided at one end of the friction-enhancing soft strip close to the control board, and the other end of the anti-slip groove extends toward the control board to be connected with the control groove. The control slider is slidably arranged in the anti-slip groove, and the sum of the lengths of the control slider and the friction-enhancing soft strip is greater than the length of the anti-slip groove, so that the control slider can slide into the control groove.

8. The object loading device according to claim 7, characterized in that: The control assembly further includes an operating block, which is slidably connected to the control block, and the operating block is provided with an operating slide groove, through which the operating block slides relative to the control block along a third direction perpendicular to both the first direction and the second direction; An operating elastic member is provided on one side of the control block facing the placement plate, and the operating elastic member is used to provide elastic force to the operating block so that the operating block has a tendency to slide toward the placement plate and fit with the end of the control slider away from the friction-increasing soft strip.

9. The object loading device according to claim 7, characterized in that: A limit block is provided on the control sliding block, and a limit groove is provided on the control plate. The limit block can be slidably arranged in the limit groove. A control elastic member is provided in the limit groove, one end of the control elastic member is connected to the limit block, and the other end of the control elastic member is connected to the inner wall of the limit groove. The control elastic member is used to provide elastic force so that the limit block has a tendency to slide in a direction away from the placement plate.

10. The object loading device according to claim 5, characterized in that: A fixing block is provided at one end of the sliding portion away from the control roller. The fixing block is used for slidingly cooperating with two clamping blocks arranged on the workbench. The fixing block is used for sliding between the two clamping blocks along the first direction.

11. The object loading device according to claim 5, characterized in that: Positioning blocks are provided on both sides of the placement plate along the second direction, and the two positioning blocks are used to contact and fit with the sliding part after the sliding plate slides, so as to limit the sliding plate from separating from the sliding part.

12. The object loading device according to claim 8, characterized in that: The operating block is provided with a slide rail, the control block is provided with a positioning slide groove for the slide rail to slide, and the slide rail cooperates with the positioning slide groove to guide the sliding of the operating block relative to the control block.

13. The loading device according to claim 8, characterized in that: A locking assembly is provided in the operating block, the locking assembly includes a locking block and a locking elastic member, the operating block is provided with a locking groove, the locking block is slidably arranged in the locking groove, the locking block is used to slide in the locking groove along the second direction, a control inclined surface is provided on the side of the locking block facing the control block, one end of the locking elastic member is connected to the inner wall of the locking groove, the other end of the locking elastic member is connected to the locking block, and the locking elastic member is used to provide elastic force to the locking block so that the locking block has a tendency to slide toward the outside of the locking groove; The locking block is configured to slide to the outside of the locking groove under the elastic force of the locking elastic member, so as to limit the operation block from sliding toward the control slide block under the elastic force of the operation elastic member.

14. The object loading device according to claim 13, characterized in that: The operating block is also provided with an unlocking assembly, which includes an unlocking block and an unlocking gear. The unlocking gear is rotatably arranged on the operating block, the operating block is provided with an unlocking groove, and the unlocking block is slidably arranged in the unlocking groove. The unlocking block is used to slide in the unlocking groove along the second direction, and the unlocking gear is located between the unlocking block and the locking block. The unlocking block and the locking block are both provided with unlocking gear teeth that mesh with the unlocking gear. When the unlocking block slides, the locking block can slide under the gear transmission action of the unlocking gear to release the restriction of the locking block on the operating block.

15. The object loading device according to claim 14, characterized in that: The operating block is also provided with a protective film, which is located on the outside of the unlocking block. The protective film is used to close the unlocking slot and to provide protection for the operator's hands.

16. A pull-out test fixture, characterized in that: It comprises the object carrying device as described in any one of claims 1 to 15, and also comprises a workbench, and the object carrying device can be movably arranged on the workbench.

17. The pull-out test fixture according to claim 16, characterized in that: The pulling test fixture further includes two clamping blocks, which are slidably disposed on the workbench and are used to slide relative to the workbench along a second direction; A rotating roller is rotatably connected to the workbench, and a first threaded hole and a second threaded hole are respectively provided on the two clamping blocks. The first threaded hole and the second threaded hole have opposite rotation directions. A rotating thread is provided on the rotating roller, and the rotating thread is threadably matched with the first threaded hole and the second threaded hole, so that the two clamping blocks can slide toward or away from each other when the rotating roller rotates.

18. The pull-out test fixture according to claim 16, characterized in that: The pull-out test fixture also includes a pull-out test device, which includes a connecting block and a pulling mechanism. The connecting block is used to be connected to the workpiece to be tested by gluing. A glue dispensing component for injecting glue is provided on the connecting block. A pull hook is also slidably connected to the connecting block. The pull hook cooperates with the pulling mechanism to apply a pulling force to the workpiece to be tested.

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