A fixing device for detecting anti-slippage coefficient of high-strength bolt connection pair

Abstract

The application relates to a fixing device for detecting the anti-slippage coefficient of a high-strength bolt connection pair, which comprises two clamping devices; the clamping device comprises a base, two movable clamping blocks for clamping the detected object from both sides, and two driving mechanisms for driving the two movable clamping blocks to move respectively; the driving mechanism drives the movable clamping blocks to slide relative to the base; the driving mechanism comprises a sliding rod, a lead screw, a lead screw nut, a worm wheel, a worm and a servo motor; the sliding rod is slidably installed to the base; the movable clamping block is fixed to one end of the sliding rod; the lead screw nut is fixed to the other end of the sliding rod; the lead screw nut and the lead screw are matched to form a lead screw nut transmission mechanism; the worm wheel and the worm are matched to form a worm wheel and worm transmission mechanism; the servo motor drives the sliding rod to slide through the lead screw nut transmission mechanism and the worm wheel and worm transmission mechanism, so that the movable clamping block slides relative to the base. The application has the beneficial effect that the movable clamping block is driven to move and clamped by the servo motor, replacing manual clamping, and the operation is labor-saving and efficient.

Description

Technical Field

[0001] This invention relates to a fixing device for detecting the anti-slip coefficient of high-strength bolt connections. Background Technology

[0002] The testing of the anti-slip coefficient of high-strength bolted connections is an important part of the inspection of steel structures. The anti-slip coefficient is an important indicator for the quality acceptance of steel structure construction projects (GB 50205-2020 Standard for Acceptance of Construction Quality of Steel Structures, Clause 6.3; Determination of Anti-slip Coefficient of Steel Plate Bolted Surface, GB / T 34478-2017; Technical Specification for High-Strength Bolted Connections of Steel Structures, JGJ82-2011).

[0003] Existing methods for testing the anti-slip coefficient of high-strength bolt connections typically employ a tensile testing machine with indicating instruments. The specimen is held at both ends by two clamps on the tensile testing machine. The testing equipment and specimens are referenced to GB / T34478-2017. For example... Figure 1 The tensile testing machine 1 holds the specimen with two clamps 2, one above and one below.

[0004] Existing fixtures for testing the anti-slip coefficient of high-strength bolt connections typically use manual rotation for locking and reference. Figure 2 The clamp 2 clamps the specimen by rotating the outer ends on both sides to control the movement of the movable clamping blocks, thus achieving clamping and releasing. This method is time-consuming, labor-intensive, inefficient, and makes it difficult to determine the alignment. If the upper and lower clamps are misaligned when holding the specimen, it affects the measurement results. Summary of the Invention

[0005] The purpose of this invention is to provide a fixing device for detecting the anti-slip coefficient of high-strength bolted connections, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A fixing device for detecting the anti-slip coefficient of a high-strength bolt connection includes: two clamping devices; each clamping device includes: a base, two movable clamping blocks that clamp the object to be tested from both sides, and two driving mechanisms that drive the two movable clamping blocks to move respectively.

[0008] The drive mechanism drives the movable clamping block to slide relative to the base. The drive mechanism includes: a sliding rod, a lead screw, a lead screw nut, a worm gear, a worm, and a servo motor. The sliding rod is slidably mounted to the base. The movable clamping block is fixed to one end of the sliding rod. The lead screw nut is fixed to the other end of the sliding rod. The lead screw nut and the lead screw together form a lead screw nut transmission mechanism. The worm gear and the worm together form a worm gear transmission mechanism. The worm gear is fixed to the lead screw and rotates coaxially with the lead screw. The servo motor drives the worm gear transmission. The servo motor drives the sliding rod to slide through the lead screw nut transmission mechanism and the worm gear transmission mechanism, thereby causing the movable clamping block to slide relative to the base.

[0009] A fixing device for detecting the anti-slip coefficient of a high-strength bolt connection further includes: two centering devices respectively installed on two clamping devices; the centering device includes: a center block and two movable rods; one end of each of the two movable rods is rotatably connected to two movable clamping blocks of the same clamping device; the two movable rods are rotatably connected to the center block; the rotation axes of the two movable rods relative to the center block are collinear; the rotation axes of the movable rods relative to the center block are parallel to the rotation axes of the movable rods relative to the movable clamping blocks.

[0010] The two axes of rotation of the two movable rods relative to the two movable clamping blocks are both set parallel to the horizontal plane; a laser emitter is installed on the center block of one of the two centering devices; and several scale lines corresponding to the light emitted by the laser emitter are provided on the center block of the other of the two centering devices.

[0011] As a further aspect of the present invention: the projection of the movable rod along the rotation axis of the movable rod relative to the central block forms a V-shape of equal length.

[0012] As a further aspect of the invention: the projections along the rotation axis of the movable rod relative to the central block form the three endpoints of an isosceles triangle.

[0013] As a further aspect of the present invention: a guide rail is formed on the base to guide the movable clamping block; the movable clamping block is provided with a guide groove that cooperates with the guide rail.

[0014] As a further aspect of the present invention: the base is formed with a notch; two movable clamping blocks are both disposed in the notch; a guide rail is disposed at the bottom of the notch and guides the sliding of the two movable clamping blocks.

[0015] As a further aspect of the present invention: the clamping device has a mirror-symmetric structure; the notch is located in the middle of the base.

[0016] As a further aspect of the present invention: a docking structure for mounting a laser emitter is formed at the bottom of the central block; and scale lines are set at the top of the central block.

[0017] As a further aspect of the present invention: a connecting rod is fixed on the movable clamping block; the movable rod is rotatably connected to the movable clamping block via the connecting rod.

[0018] As a further aspect of the invention: the movable rod is detachably mounted to the connecting rod.

[0019] As a further aspect of the present invention: both the lead screw and the worm gear are rotatably mounted to the base; the rotation axis of the lead screw is set parallel to the horizontal plane.

[0020] Compared with the prior art, the beneficial effects of the present invention are: clamping is achieved by driving the movable clamping block to move through a servo motor, replacing manual clamping, which is labor-saving and highly efficient.

[0021] The centering device utilizes the properties of an isosceles triangle to ensure the center block is always positioned precisely in the clamping position. The centering status is determined by the coordination of the laser dot and the scale lines.

[0022] The worm gear transmission mechanism in the drive mechanism can achieve a self-locking function to prevent loosening.

[0023] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a tensile testing machine in the prior art, showing that the tensile testing machine holds the specimen with two clamps, one above and one below.

[0025] Figure 2 This is a schematic diagram of a clamp in the prior art, showing that clamp 2 controls the movement of the movable clamping block by rotating the outer ends on both sides to achieve clamping and releasing;

[0026] Figure 3 This is a plan view of a fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair;

[0027] Figure 4 yes Figure 3 A schematic diagram of the internal structure of a fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair;

[0028] Figure 5 yes Figure 3 A schematic diagram of the centering device and connecting rod of a fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair;

[0029] Figure 6 yes Figure 3 A schematic diagram of the center block of a fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair;

[0030] Figure 7 yes Figure 3 A plan view of a mirror-symmetric structure of a fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair;

[0031] Figure 8 yes Figure 7 A schematic diagram of the centering device and movable clamping block of a fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair.

[0032] List of reference numerals in the attached diagram: 1. Tensile testing machine; 2. Fixture; 100. Clamping device; 10. Base; 11. Guide rail; 20. Movable clamping block; 21. Connecting rod; 30. Drive mechanism; 31. Sliding rod; 32. Lead screw; 33. Lead screw nut; 34. Worm gear; 35. Worm; 36. Servo motor; 200. Centering device; 201. Center block; 202. Movable rod. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 3 to 8 In this embodiment of the invention, a fixing device for detecting the anti-slip coefficient of a high-strength bolt connection includes: two clamping devices 100; each clamping device 100 includes: a base 10, two movable clamping blocks 20, and two driving mechanisms 30. The two movable clamping blocks 20 clamp the object to be tested from both sides. The two driving mechanisms 30 respectively drive the two movable clamping blocks 20 to move.

[0035] The drive mechanism 30 drives the movable clamping block 20 to slide relative to the base 10. The drive mechanism 30 includes a sliding rod 31, a lead screw 32, a lead screw nut 33, a worm gear 34, a worm 35, and a servo motor 36. The sliding rod 31 is slidably mounted to the base 10. The movable clamping block 20 is fixed to one end of the sliding rod 31. The lead screw nut 33 is fixed to the other end of the sliding rod 31. The lead screw nut 33 and the lead screw 32 cooperate to form a lead screw nut transmission mechanism. The worm gear 34 and the worm 35 cooperate to form a worm gear transmission mechanism. Specifically, the worm gear transmission mechanism in the drive mechanism 30 achieves a self-locking function to prevent loosening.

[0036] The worm gear 34 is fixed to the lead screw 32 and rotates coaxially with it. The servo motor 36 drives the worm gear 35 for transmission. The servo motor 36, through the lead screw and nut transmission mechanism and the worm gear transmission mechanism, drives the sliding rod 31 to slide, thereby causing the movable clamping block 20 to slide relative to the base 10. Specifically, the servo motor 36 drives the movable clamping block 20 to move and clamp, replacing manual clamping, resulting in labor-saving and highly efficient operation.

[0037] A fixing device for detecting the anti-slip coefficient of a high-strength bolt connection further includes two centering devices 200. The two centering devices 200 are respectively mounted on two clamping devices 100. Each centering device 200 includes a center block 201 and two movable rods 202. One end of each of the two movable rods 202 is rotatably connected to two movable clamping blocks 20 of the same clamping device 100. Each of the two movable rods 202 is rotatably connected to the center block 201. The rotation axes of the two movable rods 202 relative to the center block 201 are collinear. The rotation axes of the movable rods 202 relative to the center block 201 are parallel to the rotation axes of the movable rods 202 relative to the movable clamping blocks 20.

[0038] The two movable rods 202 have rotation axes parallel to the horizontal plane, each rotating relative to one of the two movable clamping blocks 20. A laser emitter is mounted on the center block 201 of one of the two centering devices 200. The center block 201 of the other centering device 200 has several scale lines. The scale lines correspond to the light emitted by the laser emitter. Specifically, the centering device 200 is designed using the properties of an isosceles triangle, ensuring that the center block 201 is always in the center of the clamping position. The centering can be determined by the coordination between the laser point and the scale lines. Furthermore, the center block 201 remains vertical under its own weight, ensuring that the light emitted by the laser emitter mounted on the center block 201 is emitted vertically, while the surface of the center block 201 with the scale lines is horizontal.

[0039] In one specific implementation, the projections of the movable rods 202 along the rotation axis relative to the center block 201 form a V-shape of equal length. The projections of the rotation axes of the two movable rods 202 along the rotation axis relative to the center block 201 also form the three endpoints of an isosceles triangle.

[0040] In one specific implementation, a guide rail 11 is formed on the base 10. The guide rail 11 guides the movable clamping block 20 to move. The movable clamping block 20 is provided with a guide groove. The guide groove cooperates with the guide rail 11. The base 10 is formed with a notch. Both movable clamping blocks 20 are disposed in the notch. The guide rail 11 is disposed at the bottom of the notch and simultaneously guides the sliding of the two movable clamping blocks 20.

[0041] In one specific implementation, the clamping device 100 has a mirror-symmetrical structure. The notch is located in the middle of the base 10.

[0042] In one specific implementation, a docking structure is formed at the bottom of the center block 201. This docking structure is used to mount the laser emitter. Scale lines are located at the top of the center block 201.

[0043] In one specific implementation, a connecting rod 21 is fixed to the movable clamping block 20. The movable rod 202 is rotatably connected to the movable clamping block 20 via the connecting rod 21. The movable rod 202 is detachably mounted to the connecting rod 21.

[0044] In one specific implementation, both the lead screw 32 and the worm gear 35 are rotatably mounted to the base 10. The rotation axis of the lead screw 32 is set parallel to the horizontal plane.

[0045] A clamping device 100 on the tensile testing machine is located below (reference). Figure 3 (orientation), another clamping device 100 is located above (reference). Figure 7 and Figure 8 (Orientation). A laser emitter is installed on the centering device 200 of the upper clamping device 100. A scale line is installed above the center block 201 of the centering device 200 of the lower clamping device 100. For the upper clamping device 100, as the movable clamping block 20 moves, the centering device 200 always keeps the center block 201 in the center of the clamping position, at which time the light emitted by the laser emitter is centered and vertically downward. For the lower clamping device 100, as the movable clamping block 20 moves, the centering device 200 always keeps the center block 201 in the center of the clamping position. Under the weight of the center block 201, the graduated side always faces upward. By comparing the light emitted by the laser emitter onto the center block 201 with the scale line, the current position can be determined, and tilting can be avoided by controlling the movement of the movable clamping block 20 of the clamping device 100.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fixing device for detecting the anti-slip coefficient of a high-strength bolt connection, characterized in that, include: Two clamping devices; The clamping device includes: a base, two movable clamping blocks that clamp the object to be tested from both sides, and two driving mechanisms that drive the two movable clamping blocks to move respectively; The driving mechanism drives the movable clamping block to slide relative to the base; the driving mechanism includes: a sliding rod, a lead screw, a lead screw nut, a worm gear, a worm, and a servo motor; the sliding rod is slidably mounted to the base; the movable clamping block is fixed to one end of the sliding rod; the lead screw nut is fixed to the other end of the sliding rod; the lead screw nut and the lead screw cooperate to form a lead screw nut transmission mechanism; the worm gear and the worm cooperate to form a worm gear transmission mechanism; the worm gear is fixed to the lead screw and rotates coaxially with the lead screw; the servo motor drives the worm gear transmission; the servo motor drives the sliding rod to slide via the lead screw nut transmission mechanism and the worm gear transmission mechanism, thereby causing the movable clamping block to slide relative to the base; The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection further includes: two centering devices respectively installed on the two clamping devices; each centering device includes: a center block and two movable rods; one end of each of the two movable rods is rotatably connected to two movable clamping blocks of the same clamping device; each of the two movable rods is rotatably connected to the center block; the rotation axes of the two movable rods relative to the center block are collinear; the rotation axis of the movable rod relative to the center block is parallel to the rotation axis of the movable rod relative to the movable clamping blocks. The two axes of rotation of the two movable rods relative to the two movable clamping blocks are both parallel to the horizontal plane; a laser emitter is installed on the center block of one of the two centering devices; the center block of the other of the two centering devices is provided with several scale lines corresponding to the light emitted by the laser emitter. The projections of the two movable rods along the rotation axis relative to the central block form a V-shape of equal length. The projections along the rotation axis of the movable rod relative to the central block form the three endpoints of an isosceles triangle.

2. The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair according to claim 1, characterized in that, The base has a guide rail for guiding the movement of the movable clamping block; the movable clamping block has a guide groove that cooperates with the guide rail.

3. The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair according to claim 2, characterized in that, The base has a notch; both movable clamping blocks are disposed within the notch; the guide rail is disposed at the bottom of the notch and guides the sliding of the two movable clamping blocks.

4. The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair according to claim 3, characterized in that, The clamping device has a mirror-symmetric structure; the notch is located in the middle of the base.

5. The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair according to claim 1, characterized in that, The bottom of the central block forms a docking structure for mounting a laser emitter; the scale lines are located on the top of the central block.

6. The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair according to claim 1, characterized in that, A connecting rod is fixed to the movable clamping block; the movable rod is rotatably connected to the movable clamping block via the connecting rod.

7. The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection pair according to claim 6, characterized in that, The movable rod is detachably mounted to the connecting rod.

8. The fixing device for detecting the anti-slip coefficient of a high-strength bolt connection according to claim 1, characterized in that, Both the lead screw and the worm gear are rotatably mounted to the base; the rotation axis of the lead screw is set parallel to the horizontal plane.

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