A pre-twisted hardware grip strength testing device

Abstract

The present invention relates to the field of pre-twisted hardware testing, and specifically to a pre-twisted hardware grip testing device, comprising a rectangular frame, a traction unit is provided at the upper end of the rectangular frame, a fixing unit is provided at the lower end of the rectangular frame, and the pre-twisted hardware to be tested is installed between the fixing unit and the traction unit; the traction unit comprises a hydraulic cylinder and a fixing mechanism; the hydraulic cylinder is used to apply tension to the pre-twisted hardware; the fixing mechanism is used to fix the cables wound on the pre-twisted hardware; in the present invention, the designed fastening mechanism cooperates with a pull rope, and the spacing between the top of the pull rope and the fixing mechanism can be adjusted by operating the fastening mechanism, thereby realizing grip testing of materials with different overall lengths, and at the same time, the pull rope damaged due to the test can be replaced, or the position of the damaged point on the pull rope can be adjusted, and the damaged point is placed outside the two fastening mechanisms to ensure the safety of the test.

Description

Technical Field

[0001] The invention relates to the field of pre-twisted hardware testing, in particular to a pre-twisted hardware gripping strength testing device. Background Art

[0002] Pre-twisted fittings are a type of connection equipment widely used in power lines. Their main feature is that they are pre-formed spiral strips that are wound around conductors or ground wires to withstand mechanical or electrical loads. After being produced, pre-twisted fittings need to undergo a series of performance tests, such as corrosion resistance tests, fatigue resistance tests, electrical performance tests, tensile performance tests, and grip strength tests.

[0003] The tensile performance test generally checks the tensile performance of the pre-twisted hardware body, while the grip test generally checks the firmness between the pre-twisted hardware and the cable.

[0004] Currently, the technology for grip strength testing methods or equipment is mature and can quickly and accurately test the results. However, there are also shortcomings and poor flexibility. Because pre-twisted hardware has a variety of sizes and specifications, and manufacturers produce different models, before testing, it is necessary to customize the overall length of the pre-twisted hardware and cables according to the use range of the test device. When the overall length is too large, the pre-twisted hardware or cable needs to be cut. If the overall length is too small, the test device cannot reach the end of the pre-twisted hardware or cable, and the test material needs to be re-provided. For manufacturers, it is time-consuming and labor-intensive, and pre-twisted hardware products cannot be tested in a timely manner.

[0005] Therefore, in order to solve the above problems, a pre-twisted hardware grip strength testing device is proposed. Summary of the invention

[0006] In order to make up for the shortcomings of the prior art, the problem that the existing testing device in the background technology cannot meet the testing requirements of pre-twisted hardware of different sizes and specifications is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a pre-twisted hardware grip strength testing device described in the present invention comprises a rectangular frame, a traction unit is provided at the upper end of the rectangular frame, a fixing unit is provided at the lower end of the rectangular frame, and a pre-twisted hardware to be tested is installed between the fixing unit and the traction unit;

[0008] The traction unit includes a hydraulic cylinder and a fixing mechanism; the hydraulic cylinder is used to apply tension to the pre-twisted hardware; the fixing mechanism is used to fix the cables wound on the pre-twisted hardware; the fixing unit includes a fixing block, in which a pull rope for fixing the pre-twisted hardware is provided, the pull rope passes around the embedded ring bolt of the pre-twisted hardware, and both ends of the pull rope are respectively penetrated by a fastening mechanism, the fastening mechanism can realize the tightening and loosening of the pull rope, and the fastening mechanism is installed in the fixing block.

[0009] Preferably, the upper end surface of the fixing block is symmetrically provided with a strip opening, and anti-slip openings are provided on both sides of the fixing block, the anti-slip openings are respectively located below the strip openings, and a fastening mechanism is provided in the anti-slip openings;

[0010] The fastening mechanism includes a cylinder, a through hole is provided in the middle position of the cylinder, the axis of the through hole is perpendicular to the axis of the cylinder, circular plates are symmetrically arranged on the cylinder, threaded holes are symmetrically provided at eccentric positions of the two circular plates, and screws are connected with threads in the two opposite threaded holes; a No. 1 extrusion block is symmetrically provided at the edge position of the inner surface of one of the circular plates, and a notch is provided at the end of the No. 1 extrusion block; a No. 2 extrusion block is symmetrically provided at the eccentric position of the inner surface of the other circular plate, and a notch is provided at the end of the No. 2 extrusion block, and the screw is rotated, the two circular plates approach each other, the No. 1 extrusion block and the No. 2 extrusion block are staggered and fitted together, and the notch squeezes the pull rope.

[0011] Preferably, a connecting plate is rotatably connected to the middle position of the screw, and the connecting plate is fixed to the inner side wall of the cylinder.

[0012] Preferably, the outer ring of each circular plate is provided with a limit block, and the limit block is slidably connected along the axis direction of the cylinder body in a limit groove provided on the inner side wall of the cylinder body.

[0013] Preferably, the screw is further provided with an extrusion plate, one end of which is gap-fitted with one of the outer rings of the screw, and the other end of the extrusion plate is threadedly connected to the other screw, and a notch is provided in the middle of the opposite surfaces of the two extrusion plates, and the notch can squeeze the pull rope.

[0014] Preferably, an arc-shaped convex portion is provided on the outer surface of each of the No. 2 extrusion blocks, the inner surface of the convex portion is flush with the surface of the notch on the No. 2 extrusion block, and the convex portion can be embedded in the notch on the No. 1 extrusion block.

[0015] Preferably, the fixing mechanism includes a pull plate, the upper surface of the pull plate is connected to the output end of the hydraulic cylinder, a plurality of steel cables are arranged on the lower surface of the pull plate, a support plate is fixedly connected to the lower end of the steel cables, a clearance opening is opened on one side of the support plate, a locking block is arranged on the support plate, and the cable is fixed in the locking block by screws; the cable slides along the clearance opening to the axial position of the support plate, and the locking block is placed above the support plate.

[0016] Preferably, the upper surface of the support plate is provided with anti-slip protrusions, and the anti-slip protrusions are arranged on both sides of the yielding opening, and the anti-slip protrusions can be pressed against the bottom edge position of the locking block.

[0017] Preferably, the support plate is also symmetrically provided with anti-slip plates, which are symmetrically arranged on both sides of the clearance opening, and the anti-slip plates are sleeved on the outer rings of the steel cables on both sides of the clearance opening through torsion springs, and the torsion force of the torsion springs can enable the ends of the anti-slip plates to press against the locking block.

[0018] Preferably, the rectangular frame is also provided with a vibration component for simulating a natural environment; the vibration component includes a guard plate hinged on the rectangular frame, a motor is fixedly connected to the guard plate, a turntable is fixedly connected to the output end of the motor, and a plurality of striking blocks are provided on the outer ring of the turntable; the guard plate is also provided with an impact plate connected by a spring, the impact plate is attached to the surface of the pre-twisted hardware, the striking block can intermittently strike the impact plate, and the impact plate intermittently strikes the surface of the pre-twisted hardware.

[0019] The present invention is beneficial in that:

[0020] 1. In the present invention, the fastening mechanism is designed to cooperate with the drawstring. The distance between the top of the drawstring and the fixing mechanism can be adjusted by operating the fastening mechanism, thereby realizing the grip strength test of materials with different overall lengths. At the same time, the drawstring damaged by the test can be replaced, or the position of the damaged point on the drawstring can be adjusted, and the damaged point can be placed outside the two fastening mechanisms to ensure the safety of the test.

[0021] 2. The designed vibration component is used to simulate the impact of natural wind on the material. The impact plate is attached to the surface of the material, the motor drives the turntable to rotate, and the striking block intermittently hits the impact plate, and the impact plate impacts the surface of the material, simulating the impact of natural wind on the material, making the material test more representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the pre-twisted hardware grip strength testing device of the present invention;

[0023] Figure 2 It is a front view of the pre-twisted hardware grip strength testing device of the present invention;

[0024] Figure 3 It is a rear view of the pre-twisted hardware grip strength testing device of the present invention;

[0025] Figure 4 It is a cross-sectional view of the pre-twisted hardware grip strength testing device of the present invention;

[0026] Figure 5 is a three-dimensional diagram of the fastening mechanism of the present invention;

[0027] Figure 6 It is a front view of the fastening mechanism in the present invention;

[0028] Figure 7 It is a three-dimensional diagram of the cylinder in the present invention;

[0029] Figure 8 It is a three-dimensional diagram of the cooperation between the screw rod and the circular plate in the present invention;

[0030] Fig. 9 It is a three-dimensional diagram of the cooperation between the draw cord and the fastening mechanism in the present invention;

[0031] Fig.10 It is a top view of the cooperation between the screw rod and the circular plate in the present invention;

[0032] Fig.11 is a three-dimensional diagram of the fixing mechanism in the present invention;

[0033] Fig.12 is a three-dimensional diagram of the vibration assembly of the present invention;

[0034] Fig.13 It is a three-dimensional diagram of the cooperation between the guard plate and the motor in the present invention.

[0035] In the figure: 1. rectangular frame; 2. hydraulic cylinder; 3. cable; 4. fixing block; 5. pull rope; 6. embedded ring; 7. strip mouth; 8. anti-slip mouth; 9. cylinder; 10. through hole; 11. round plate; 12. screw; 13. No. 1 extrusion block; 14. notch; 15. No. 2 extrusion block; 16. connecting plate; 17. limit block; 18. limit groove; 19. extrusion plate; 20. notch; 21. convex part; 22. pull plate; 23. steel cable; 24. support plate; 25. make way mouth; 26. lock block; 27. anti-slip protrusion; 28. anti-slip plate; 29. ​​torsion spring; 30. guard plate; 31. motor; 32. turntable; 33. striking block; 34. spring; 35. impact plate; 36. reel. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] Reference Figure 1 - Fig.13 A pre-twisted hardware grip testing device comprises a rectangular frame 1, a traction unit is provided at the upper end of the rectangular frame 1, a fixing unit is provided at the lower end of the rectangular frame 1, and a pre-twisted hardware to be tested is installed between the fixing unit and the traction unit;

[0038] The traction unit includes a hydraulic cylinder 2 and a fixing mechanism; the hydraulic cylinder 2 is used to apply tension to the pre-twisted hardware; the fixing mechanism is used to fix the cable 3 wound on the pre-twisted hardware; the fixing unit includes a fixing block 4, in which a pull rope 5 for fixing the pre-twisted hardware is arranged, the pull rope 5 passes through the bolt of the embedded ring 6 of the pre-twisted hardware, and the two ends of the pull rope 5 are respectively penetrated by a fastening mechanism, the fastening mechanism can realize the fastening and loosening of the pull rope 5, and the fastening mechanism is installed in the fixing block 4;

[0039] In this embodiment, the problem to be solved is how to adapt to the grip test of materials of different lengths, that is, the grip test of the cable 3 wrapped with pre-twisted hardware; in this embodiment, the grip test device designed can be flexibly adjusted according to the materials brought by the manufacturer, and can adapt to materials of different overall lengths; the upper end of the cable 3 is connected to the hydraulic cylinder 2 through a fixing mechanism, and the hydraulic cylinder 2 is controlled by an external hydraulic system and cooperates with the control system for execution; a twisted wire is wound on the cable 3, and the lower end of the twisted wire is in a ring shape and is sleeved on the embedded ring 6 of the pre-twisted hardware. A bolt passes through the lower end of the embedded ring 6, and a pull rope 5 is wound on the bolt. The two ends of the pull rope 5 are respectively connected to the fastening mechanism, and the operation of the fastening mechanism can realize the adjustment of the distance between the top of the pull rope 5 and the fixing mechanism, thereby realizing the grip test of materials of different overall lengths, and the operation of the fastening mechanism can not only realize the grip test of materials of different overall lengths, but also realize the replacement of the pull rope 5 damaged due to the test, or adjust the position of the damaged point on the pull rope 5, and place the damaged point outside the two fastening mechanisms to ensure the safety of the test.

[0040] Reference Figure 1 - Fig.10 The upper end surface of the fixed block 4 is symmetrically provided with a strip opening 7, and both sides of the fixed block 4 are provided with anti-slip openings 8, the anti-slip openings 8 are respectively located below the strip opening 7, and a fastening mechanism is provided in the anti-slip openings 8;

[0041] The fastening mechanism includes a cylinder 9, a through hole 10 is provided in the middle position of the cylinder 9, the axis of the through hole 10 is perpendicular to the axis of the cylinder 9, the cylinder 9 is symmetrically provided with circular plates 11, threaded holes are symmetrically provided at eccentric positions of the two circular plates 11, and screws 12 are connected to the inner threads of the two opposite threaded holes; a No. 1 extrusion block 13 is symmetrically provided at the edge position of the inner surface of one of the circular plates 11, and a notch 14 is provided at the end of the No. 1 extrusion block 13; a No. 2 extrusion block 15 is symmetrically provided at the eccentric position of the inner surface of the other circular plate 11, and a notch 14 is provided at the end of the No. 2 extrusion block 15, and the screw 12 is rotated, the two circular plates 11 are close to each other, the No. 1 extrusion block 13 and the No. 2 extrusion block 15 are staggered and fitted together, and the notch 14 squeezes the pull rope 5; two reels 36 are provided on both sides of the bottom of the fixed block 4, and the two reels 36 can realize the release and reeling of the pull rope 5, which is convenient for the pull rope 5 Storage; When testing the grip strength of the material, if the overall length of the material is too small, rotate the reel 36 to release the drawstring 5, then take the fastening mechanism out of the anti-slip opening 8, and relax the fastening mechanism, that is, rotate the screw 12, the screw 12 drives the two circular plates 11 to move away from each other, at this time the No. 1 extrusion block 13 and the No. 2 extrusion block 15 no longer squeeze the drawstring 5, pull the drawstring 5, extend the length of the drawstring 5 between the two fastening mechanisms, and then rotate the screw 12 in the opposite direction, the screw 12 drives the two circular plates 11 relatively close, and at the same time the No. 1 extrusion block 13 and the No. 2 extrusion block 15 gradually overlap, and the drawstring 5 is squeezed into the notch 14, at this time the length of the drawstring 5 between the two fastening mechanisms is stabilized, to achieve testing of materials with an overall length that is too small; similarly, if the overall length of the material is too large, the drawstring 5 between the two fastening mechanisms can be rolled up so that the drawstring 5 can adapt to the test material.

[0042] Reference Figure 5 - Fig.10 The middle position of the screw rod 12 is rotatably connected with a connecting plate 16, and the connecting plate 16 is fixed to the inner wall of the cylinder 9; the middle position of the screw rod 12 is rotatably connected with the connecting plate 16, and the connecting plate 16 fixes the position of the screw rod 12 in the cylinder 9. At the same time, the screw rod 12 is threadedly connected to the circular plate 11, which stabilizes the circular plate 11, so that the screw rod 12 and the circular plate 11 are always placed in the cylinder 9, which is convenient for squeezing, fixing and relaxing the pull rope 5.

[0043] Reference Figure 5 - Fig.10A limit block 17 is provided on the outer ring of each circular plate 11, and the limit block 17 is slidably connected in the limit groove 18 opened on the inner side wall of the cylinder 9 along the axial direction of the cylinder 9; the screw 12 rotates, and the circular plate 11 moves axially along the cylinder 9. In order to facilitate the pull rope 5 to pass through the two through holes 10 and the notch 14 on the cylinder 9, the relative rotation between the circular plate 11 and the cylinder 9 is constrained, and the limit block 17 is slidably connected in the limit groove 18, so that the circular plate 11 can only move axially along the cylinder 9, thereby ensuring that the middle position of the No. 1 extrusion block 13 and the No. 2 extrusion block 15 is opposite to the through hole 10, and the end of the pull rope 5 is conveniently passed through.

[0044] Reference Figure 5 - Fig.10 The screw 12 is also provided with an extrusion plate 19, one end of which is gap-fitted with the outer ring of one of the screws 12, and the other end of the extrusion plate 19 is threadedly connected to the other screw 12, and a notch 20 is provided in the middle of the opposite surfaces of the two extrusion plates 19, and the notch 20 can squeeze the pull rope 5; the setting of the extrusion plate 19 assists the No. 1 extrusion block 13 and the No. 2 extrusion block 15 in squeezing and clamping the pull rope 5, and when the screw 12 is rotated, the screw 12 will also drive the extrusion plate 19 to move, and the notch 20 of the extrusion plate 19 will be squeezed on the surface of the pull rope 5, further squeezing, clamping and fixing the pull rope 5.

[0045] Reference Figure 5 - Fig.10 Each of the No. 2 extrusion blocks 15 has an arc-shaped protrusion 21 on its outer surface, the inner surface of the protrusion 21 is flush with the surface of the notch 14 on the No. 2 extrusion block 15, and the protrusion 21 can be embedded in the notch 14 on the No. 1 extrusion block 13; the No. 1 extrusion block 13 cooperates with the No. 2 extrusion block 15 to squeeze and clamp the pull rope 5, and the protrusion 21 will also be embedded in the notch 14 on the No. 1 extrusion block 13, and the protrusion 21 squeezes the pull rope 5 into the notch 14, thereby improving the clamping stability of the pull rope 5.

[0046] Reference Figure 1 - Figure 4 ,as well as Fig.11The fixing mechanism includes a pull plate 22, the upper surface of the pull plate 22 is connected to the output end of the hydraulic cylinder 2, and a plurality of steel cables 23 are arranged on the lower surface of the pull plate 22. The lower end of the steel cable 23 is fixedly connected to a support plate 24, and a clearance opening 25 is provided on one side of the support plate 24. A locking block 26 is provided on the support plate 24, and the cable 3 is fixed in the locking block 26 by screws; the cable 3 slides along the clearance opening 25 to the axial position of the support plate 24, and the locking block 26 is placed above the support plate 24; a plug hole is provided at the bottom of the locking block 26, so that the end of the cable 3 can be inserted into the plug hole, and then the screws are tightened. The wire radially penetrates into the socket and is squeezed on the outer surface of the end of the cable 3, fixing the pull rope 5 and the locking block 26 together, and then the cable 3 is slid along the clearance opening 25 to the axial position of the support plate 24, and the locking block 26 is lifted on the upper surface of the support block, and then the hydraulic cylinder 2 is driven by the control system to pull up the support plate 24, and the support plate 24 pulls up the cable 3 through the locking block 26, and then the grip between the cable 3 and the pre-twisted hardware is tested; the design of the fixing mechanism can quickly realize the installation and disassembly of the cable 3 and the traction unit, and improve the efficiency of the grip test of the pre-twisted hardware.

[0047] Reference Figure 1 - Figure 4 ,as well as Fig.11 The upper surface of the support plate 24 is provided with an anti-slip protrusion 27, which is arranged on both sides of the yielding opening 25, and the anti-slip protrusion 27 can be pressed against the bottom edge of the locking block 26; in order to improve the test safety, so as to prevent the locking block 26 from accidentally sliding off the support plate 24 during the test and causing a test accident, an anti-slip protrusion 27 is provided on the support plate 24, and the anti-slip protrusion 27 can be pressed against the bottom position of the locking block 26 to limit the locking block 26 on the support plate 24.

[0048] Reference Figure 1 - Figure 4 ,as well as Fig.11 , the support plate 24 is also symmetrically provided with anti-slip plates 28, which are symmetrically arranged on both sides of the yielding opening 25, and the anti-slip plates 28 are sleeved on the outer rings of the steel cables 23 on both sides of the yielding opening 25 through torsion springs 29, and the torsion force of the torsion springs 29 can realize that the ends of the anti-slip plates 28 are pressed against the locking blocks 26; in the process of installing the material on the grip testing device, in order to facilitate the installation of the material by the operator, the anti-slip plates 28 are designed, first the locking blocks 26 are placed on the support plate 24, the anti-slip plates 28 are bent, so that the anti-slip plates 28 are rotated outward, and then the locking blocks 26 are placed on the support plate 24, and then the anti-slip plates 28 are released, and the anti-slip plates 28 are pressed against the locking blocks 26 under the torsion force of the torsion springs 29 connected thereto, and the locking blocks 26 are constrained on the support plate 24, and then the lower end of the material is operated, that is, the embedded ring 6 is installed on the pull rope 5, at this time, the upper end of the material is still stable on the support plate 24, and no falling accident will occur.

[0049] Reference Fig.12 and Fig.13, the rectangular frame 1 is also provided with a vibration component that simulates the natural environment; the vibration component includes a guard plate 30 hinged on the rectangular frame 1, a motor 31 is fixedly connected to the guard plate 30, a turntable 32 is fixedly connected to the output end of the motor 31, and a plurality of striking blocks 33 are provided on the outer ring of the turntable 32; the guard plate 30 is also provided with a strike plate 35 connected by a spring 34, the strike plate 35 is attached to the surface of the pre-twisted hardware, the strike block 33 can intermittently strike the strike plate 35, and the strike plate 35 intermittently strikes the surface of the pre-twisted hardware; in order to simulate the real use environment of the pre-twisted hardware, the pre-twisted hardware will also be used outdoors , the external natural wind will cause impact on it, and the designed vibration component is used to simulate the impact of natural wind, that is, when the material is subjected to axial tension, it also bears radial impact; the rotating guard plate 30, the guard plate 30 is buckled on the rectangular frame 1, and the setting of the guard plate 30 not only provides support for the vibration component, but also provides safety protection for the grip testing device; the impact plate 35 is attached to the surface of the material, the motor 31 drives the turntable 32 to rotate, and the striking block 33 intermittently strikes the impact plate 35, and the impact plate 35 strikes the surface of the material, simulating the impact of natural wind on the material, making the material test more representative.

[0050] Working principle: In this embodiment, the problem to be solved is how to adapt to the grip test of materials of different lengths, that is, the grip test of the cable 3 wrapped with pre-twisted hardware; in this embodiment, the grip test device designed can be flexibly adjusted according to the materials brought by the manufacturer, and can adapt to materials with different overall lengths; the upper end of the cable 3 is connected to the hydraulic cylinder 2 through a fixing mechanism, and the hydraulic cylinder 2 is controlled by an external hydraulic system and cooperates with the control system for execution; the cable 3 is wrapped with a twisted wire, and the lower end of the twisted wire is in a ring shape and is sleeved on the embedded ring 6 of the pre-twisted hardware. The lower end of the embedded ring 6 is penetrated by a bolt, and a pull rope 5 is wound on the bolt. The two ends of the pull rope 5 are respectively connected to the fastening mechanism, and the operation of the fastening mechanism can realize the adjustment of the distance between the top of the pull rope 5 and the fixing mechanism, thereby realizing the grip test of materials with different overall lengths, and the operation of the fastening mechanism can not only realize the grip test of materials with different overall lengths, but also realize the replacement of the pull rope 5 damaged due to the test, or adjust the position of the damaged point on the pull rope 5, and place the damaged point outside the two fastening mechanisms to ensure the safety of the test;

[0051] The two ends of the lever 34 are in the same position as the lever 36, and the two ends of the lever 34 are in the same position as the lever 36. When the lever 34 is in the same position, the lever 34 is in the same position as the lever 36. When the lever 34 is in the same position, the lever 34 is in the same position as the lever 36. When the lever 34 is in the same position, the lever 34 is in the same position as the lever 36.

[0052] The middle position of the screw rod 12 is rotatably connected with a connecting plate 16, which is fixed to the inner wall of the cylinder 9; the middle position of the screw rod 12 is rotatably connected with the connecting plate 16, and the connecting plate 16 fixes the position of the screw rod 12 in the cylinder 9. At the same time, the screw rod 12 is threadedly connected with the circular plate 11, which also stabilizes the circular plate 11, so that the screw rod 12 and the circular plate 11 are always placed in the cylinder 9, which is convenient for squeezing, fixing and relaxing the pull rope 5;

[0053] The screw 12 rotates, and the circular plate 11 moves axially along the cylinder 9. In order to facilitate the pull rope 5 to pass through the two through holes 10 and the notch 14 on the cylinder 9, the relative rotation between the circular plate 11 and the cylinder 9 is constrained, and the limit block 17 is slidably connected in the limit groove 18, so that the circular plate 11 can only move axially along the cylinder 9, thereby ensuring that the middle position of the No. 1 extrusion block 13 and the No. 2 extrusion block 15 is opposite to the through hole 10, and the end of the pull rope 5 is conveniently passed through;

[0054] The setting of the extrusion plate 19 assists the first extrusion block 13 and the second extrusion block 15 in extruding and clamping the pull rope 5. When the screw 12 is rotated, the screw 12 will also drive the extrusion plate 19 to move, and the notch 20 of the extrusion plate 19 will be pressed on the surface of the pull rope 5, further squeezing, clamping and fixing the pull rope 5;

[0055] The first extrusion block 13 cooperates with the second extrusion block 15 to squeeze and clamp the drawstring 5, and the protrusion 21 is also embedded in the notch 14 on the first extrusion block 13. The protrusion 21 squeezes the drawstring 5 into the notch 14 to improve the clamping stability of the drawstring 5;

[0056] A plug hole is provided at the bottom of the locking block 26 so that the end of the cable 3 can be inserted into the plug hole, and then the screw is tightened, the screw radially penetrates into the plug hole, and is squeezed on the outer surface of the end of the cable 3, fixing the pull rope 5 and the locking block 26 together, and then the cable 3 is slid into the axial position of the support plate 24 along the clearance opening 25, and the locking block 26 is lifted on the upper surface of the support block, and then the hydraulic cylinder 2 is driven by the control system to pull up the support plate 24, and the support plate 24 pulls up the cable 3 through the locking block 26, and then the grip between the cable 3 and the pre-twisted hardware is tested; the design of the fixing mechanism can quickly realize the installation and disassembly of the cable 3 and the traction unit, and improve the efficiency of the grip test of the pre-twisted hardware;

[0057] In order to improve the test safety and prevent the locking block 26 from accidentally sliding off the support plate 24 during the test, causing a test accident, an anti-slip protrusion 27 is provided on the support plate 24, and the anti-slip protrusion 27 can be pressed against the bottom position of the locking block 26 to restrict the locking block 26 on the support plate 24;

[0058] During the process of installing the material on the grip test device, in order to facilitate the operator to install the material, an anti-drop plate 28 is designed. First, the locking block 26 is placed on the support plate 24, and the anti-drop plate 28 is moved to rotate the anti-drop plate 28 outward. Then the locking block 26 is placed on the support plate 24, and then the anti-drop plate 28 is released. Under the torsion of the torsion spring 29 connected to it, the anti-drop plate 28 presses on the locking block 26, and the locking block 26 is constrained on the support plate 24. Then, the lower end of the material is operated, that is, the embedded ring 6 is installed on the pull rope 5. At this time, the upper end of the material is still stable on the support plate 24, and no falling accident will occur.

[0059] In order to simulate the actual use environment of the pre-twisted hardware, the pre-twisted hardware will also be used outdoors, and the natural wind from the outside will cause impact on it. The designed vibration component is used to simulate the impact of natural wind, that is, when the material is subjected to axial tension, it also withstands radial impact; the rotating guard plate 30, the guard plate 30 is buckled on the rectangular frame 1, and the setting of the guard plate 30 not only provides support for the vibration component, but also provides safety protection for the grip testing device; the impact plate 35 is attached to the surface of the material, the motor 31 drives the turntable 32 to rotate, and the striking block 33 intermittently strikes the impact plate 35, and the impact plate 35 strikes the surface of the material, simulating the impact of natural wind on the material, making the material test more representative.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pre-twisted hardware grip strength testing device, characterized in that: It comprises a rectangular frame (1), wherein a traction unit is provided at the upper end of the rectangular frame (1), a fixing unit is provided at the lower end of the rectangular frame (1), and a pre-twisted hardware to be tested is installed between the fixing unit and the traction unit; The traction unit comprises a hydraulic cylinder (2) and a fixing mechanism; the hydraulic cylinder (2) is used to apply a pulling force to the pre-twisted hardware; the fixing mechanism is used to fix the cable (3) wound on the pre-twisted hardware; the fixing unit comprises a fixing block (4), a pull rope (5) for fixing the pre-twisted hardware is arranged in the fixing block (4), the pull rope (5) passes around the bolt of the insert ring (6) of the pre-twisted hardware, and the two ends of the pull rope (5) are respectively penetrated by a fastening mechanism, the fastening mechanism can realize the fastening and loosening of the pull rope (5), and the fastening mechanism is installed in the fixing block (4); The upper end surface of the fixing block (4) is symmetrically provided with a strip opening (7), and both sides of the fixing block (4) are provided with anti-slip openings (8), the anti-slip openings (8) are respectively located below the strip openings (7), and a fastening mechanism is arranged in the anti-slip openings (8); The fastening mechanism comprises a cylinder (9), a through hole (10) is provided at the middle position of the cylinder (9), the axis of the through hole (10) is perpendicular to the axis of the cylinder (9), the cylinder (9) is symmetrically provided with circular plates (11), threaded holes are symmetrically provided at eccentric positions of the two circular plates (11), and screw rods (12) are connected to the inner threads of the two opposite threaded holes; a first extrusion block (13) is symmetrically provided at the edge position of the inner surface of one of the circular plates (11), and a notch (14) is provided at the end of the first extrusion block (13); a second extrusion block (15) is symmetrically provided at the eccentric position of the inner surface of the other circular plate (11), and a notch (14) is provided at the end of the second extrusion block (15); the screw rod (12) is rotated, the two circular plates (11) are close to each other, the first extrusion block (13) and the second extrusion block (15) are staggered and fitted together, and the notch (14) squeezes the pull rope (5).

2. The pre-twisted hardware grip strength testing device according to claim 1, characterized in that: A connecting plate (16) is rotatably connected to the middle position of the screw rod (12), and the connecting plate (16) is fixedly connected to the inner wall of the cylinder (9).

3. The pre-twisted hardware grip strength testing device according to claim 1, characterized in that: The outer ring of each circular plate (11) is provided with a limit block (17), and the limit block (17) is slidably connected along the axis direction of the cylinder (9) in a limit groove (18) provided on the inner wall of the cylinder (9).

4. The pre-twisted hardware grip strength testing device according to claim 2, characterized in that: The screw rod (12) is also provided with an extrusion plate (19), one end of which is loosely fitted with the outer ring of one of the screw rods (12), the other end of which is threadedly connected to the other screw rod (12), and a notch (20) is provided in the middle of the opposing surfaces of the two extrusion plates (19), the notch (20) being capable of squeezing the pull rope (5).

5. The pre-twisted hardware grip strength testing device according to claim 1, characterized in that: An arc-shaped convex portion (21) is provided on the outer surface of each of the second extrusion blocks (15); the inner surface of the convex portion (21) is flush with the surface of the notch (14) on the second extrusion block (15); and the convex portion (21) can be embedded in the notch (14) on the first extrusion block (13).

6. The pre-twisted hardware grip strength testing device according to claim 1, characterized in that: The fixing mechanism comprises a pull plate (22), the upper surface of the pull plate (22) is connected to the output end of the hydraulic cylinder (2), a plurality of steel cables (23) are arranged on the lower surface of the pull plate (22), the lower end of the steel cables (23) is fixedly connected to a support plate (24), a clearance opening (25) is provided on one side of the support plate (24), a locking block (26) is provided on the support plate (24), and the cable (3) is fixed in the locking block (26) by means of screws; the cable (3) slides along the clearance opening (25) to the axial position of the support plate (24), and the locking block (26) is placed above the support plate (24).

7. The pre-twisted hardware grip strength testing device according to claim 6, characterized in that: The upper surface of the support plate (24) is provided with an anti-slip protrusion (27), which is arranged on both sides of the clearance opening (25). The anti-slip protrusion (27) can be pressed against the bottom edge of the locking block (26).

8. The pre-twisted hardware grip strength testing device according to claim 7, characterized in that: The support plate (24) is also symmetrically provided with anti-slip plates (28), which are symmetrically arranged on both sides of the clearance opening (25), and the anti-slip plates (28) are sleeved on the outer rings of the steel cables (23) on both sides of the clearance opening (25) through torsion springs (29), and the torsion force of the torsion springs (29) can enable the ends of the anti-slip plates (28) to press against the locking blocks (26).

9. The pre-twisted hardware grip strength testing device according to claim 1, characterized in that: The rectangular frame (1) is also provided with a vibration component for simulating a natural environment; the vibration component comprises a guard plate (30) hinged on the rectangular frame (1); a motor (31) is fixedly connected to the guard plate (30); a turntable (32) is fixedly connected to the output end of the motor (31); a plurality of striking blocks (33) are provided on the outer ring of the turntable (32); the guard plate (30) is also provided with an impact plate (35) connected with a spring (34); the impact plate (35) is attached to the surface of the pre-twisted hardware; the striking blocks (33) can intermittently strike the impact plate (35); and the impact plate (35) intermittently strikes the surface of the pre-twisted hardware.

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