A high-strength prestressed steel strand shear resistance test device

Abstract

The present application belongs to the technical field of steel strand test, especially a high-strength prestressed steel strand shear resistance test device, aiming at the fact that the existing test equipment cannot simulate the shear stress state of steel strand under different working angles, resulting in inaccurate test data, the following scheme is proposed, including a machine table, two lead screws and two slide columns are arranged on the machine table; a suspension platform group is arranged on the lead screws and slide columns, and the suspension platform group comprises a suspension, two lifting cylinders and two movable position cylinders. The high-strength prestressed steel strand shear resistance test device disclosed by the present application utilizes the winding fixing assembly, which can simulate the stress state of the steel strand under different working angles as needed while stably clamping the steel strand, so that the comprehensive detection of multiple shear performance indicators can be completed in one test, compared with the limitation that the traditional universal testing machine can only test at a single angle, the device effectively improves the detection efficiency, the comprehensiveness and accuracy of the results.

Description

Technical Field

[0001] This invention relates to the field of steel strand testing technology, and in particular to a shear resistance testing device for high-strength prestressed steel strands. Background Technology

[0002] Prestressed steel strands are widely used in railways, highway bridges, water conservancy projects, nuclear power plant containment structures, as well as in soil and rock anchoring and coal mine support. Prestressed steel strands are made by drawing high-strength steel wire from high-carbon steel wire rods, which undergo a scoring process to obtain the specified scoring shape and size, followed by twisting and stabilization treatment. The resulting prestressed steel strands have a strength of over 1860MPa and low surface deformation relaxation. They have high elongation, strong grip, good flexibility, and are easy to construct. They are particularly suitable for prefabricated building systems in projects with characteristics such as large spans, high heights, large loads, and large scale.

[0003] To ensure the quality of prestressed steel strands, multiple tests and experiments are conducted during the forming and processing, including chemical composition, sorbitization rate, decarburization layer depth, non-metallic inclusions, surface quality, and mechanical properties, to ensure that the mechanical properties, relaxation properties, and dimensions of the product meet the finished product standards.

[0004] Currently, shear tests on steel strands are mainly conducted using universal testing machines in conjunction with specialized shear fixtures. In practical engineering scenarios such as anchor cable support in coal mine roadways and prestressed bridge structures, steel strands are often under complex stress states, bearing both axial tension and shear forces from different directions. Therefore, the shear performance of steel strands is closely related to their stress angle, and there are significant differences in shear strength under different operating angles. However, existing universal testing machines and their matching shearing devices can usually only perform single-item shear tests in a fixed force direction, and cannot simulate the shear stress state of steel strands under different operating angles. This makes it difficult for the test data to truly reflect the shear performance of steel strands in actual engineering projects. Summary of the Invention

[0005] This invention discloses a high-strength prestressed steel strand shear resistance testing device, which aims to solve the technical problem in the background art that existing testing equipment cannot simulate the shear stress state of steel strands under different operating angles, resulting in inaccurate test data.

[0006] The present invention proposes a high-strength prestressed steel strand shear resistance testing device, comprising:

[0007] A high-strength prestressed steel strand shear resistance testing device includes:

[0008] The machine tool is equipped with two lead screws and two sliding columns.

[0009] A suspension assembly is mounted on a lead screw and a sliding column. The suspension assembly includes a suspension frame, two lifting cylinders, and two movable cylinders. The suspension frame is fixedly connected between one lifting cylinder and one movable cylinder.

[0010] Two side frames are fixedly connected to the outside of the two movable cylinders, and the side frames are L-shaped.

[0011] Two winding fixing assemblies are respectively installed on two side frames, and the two winding fixing assemblies are used to install and fix the same steel strand.

[0012] Two central frames are fixedly connected to the outside of the two movable cylinders, respectively;

[0013] Two adjustable anti-backflow components are respectively installed on two central frames. The two adjustable anti-backflow components are used to prevent the steel strand from springing back after it breaks.

[0014] In a preferred embodiment, the winding fixing assembly includes:

[0015] A winding reel is mounted on a side frame, and the winding reel is located on the outside of the side frame;

[0016] A movable plate is set on the winding spool. The movable plate has two insertion holes. Two plug blocks are fixedly connected to the winding spool. The two plug blocks are inserted into the two insertion holes.

[0017] Two return springs are fixedly connected to the winding spool. The movable plate has two recessed holes, and the two return springs are respectively disposed inside the two recessed holes.

[0018] Two conical locking platforms are fixedly connected to the outer surfaces of the winding reel and the movable reel, respectively. The two conical locking platforms are combined to form a frustum-shaped screw with external threads.

[0019] Locking bolts are located on the outside of the two conical locking platforms. The locking bolts are used to lock and fix the frustum-shaped screw formed by the combination of the two conical locking platforms.

[0020] The winding fixing assembly further includes:

[0021] A winding groove is provided on the winding reel and the movable reel, and the winding groove is used to wind and store steel strands.

[0022] A locking hole is provided inside the winding reel and the movable reel. The locking hole is L-shaped and passes through the conical locking platform and communicates with the winding groove.

[0023] A rotating shaft is fixedly connected to the back of the winding reel, and a shaft hole is provided on the side frame, through which the rotating shaft is movably connected;

[0024] A brake motor is fixedly connected to the upper side of the side frame, and the side frame has a motor shaft hole through which the shaft of the brake motor passes.

[0025] The speed reducer is fixedly connected to the side frame and connects the motor shaft and the rotating shaft.

[0026] In a preferred embodiment, the adjustable anti-backflow assembly includes:

[0027] The rotating disc is movably connected to the central frame;

[0028] The bracket is fixedly connected to the turntable, and a connecting shaft is fixedly connected to the front end of the bracket;

[0029] An anti-return box is installed at the top of the connecting shaft;

[0030] A movable connecting sleeve is provided on the anti-return box, and the top end of the connecting shaft is provided with a connector that mates with the movable connecting sleeve;

[0031] A wire hole is provided on the anti-return box, and the wire hole passes through the anti-return box.

[0032] The adjustable anti-backflow assembly also includes:

[0033] Two pressure blocks are set inside the anti-return box. The outer side of each pressure block is provided with a sliding groove. The inside of the anti-return box is provided with a slide rail. The two pressure blocks are set on the slide rail of the anti-return box. The two pressure blocks are located inside the anti-return box and are symmetrically distributed vertically.

[0034] A wedge-shaped boss is located on one side opposite to the two pressure blocks;

[0035] Two flip frames are provided, and the anti-return box has symmetrical mounting positions at the top and bottom. The flip frames are movably connected to the mounting positions of the anti-return box.

[0036] Two movable connecting rods are set in two mounting positions of the anti-return box, and the two ends of the movable connecting rods are respectively connected to one end of the flipping frame and the pressure block;

[0037] Two functional springs are provided. Grooves are provided on both the upper and lower sides of the anti-return box. An installation block is fixedly connected to the other end of the flipping frame. The functional springs are set in the grooves of the anti-return box, and the other end of the functional springs is connected to the installation block.

[0038] In a preferred embodiment, a panel is fixedly connected to the central frame, the panel is provided with a dial, and the bracket has a recessed hole with a pointer inside the recessed hole, the pointer being used to indicate the reading on the dial.

[0039] A base frame is fixedly connected to the movable cylinder. An adjustment motor is fixedly connected to the base frame near the side frame. A motor shaft hole is opened on the base frame. The output shaft of the adjustment motor passes through the motor shaft hole and is fixedly connected to the drive gear. An arc-shaped groove is opened on the outside of the rotating disc. A traction gear is fixedly connected inside the arc-shaped groove. The drive gear meshes with the traction gear.

[0040] In a preferred embodiment, a top platform is provided above the machine base, a sliding column is fixedly connected between the upper surface of the machine base and the lower surface of the top platform, the upper end of the lead screw is movably connected to the lower surface of the top platform, two round holes are provided on the machine base, and an inner plate is provided inside the machine base. The lower ends of the two lead screws pass through the two round holes of the machine base and are movably connected to the upper surface of the inner plate. A drive wheel is provided on each of the two lead screws, and a motor base is provided at the bottom of the machine base. A drive motor is fixedly connected to the motor base, and a motor shaft hole is provided on the inner plate. The output shaft of the drive motor passes through the motor shaft hole of the inner plate and is fixedly connected to the drive wheel. A synchronous toothed belt is provided between the drive wheel and the two drive wheels.

[0041] In a preferred embodiment, a shear test module is provided on the upper side of the machine.

[0042] The shear test module includes:

[0043] The base plate is fixedly connected to the upper surface of the machine tool;

[0044] Mounting bracket, fixedly connected to the base plate;

[0045] The hydraulic cylinder is fixedly connected to the mounting base, and a top block is fixedly connected to the telescopic end of the hydraulic cylinder facing upward.

[0046] The cutter holder is located above the top block. The cutter holder has a cutter groove, and a single scissor for unidirectional testing of the shear strength of steel strands is fixedly connected inside the cutter groove.

[0047] A pressure sensor is installed between the top block and the tool holder, and the pressure sensor is used to record and feedback the pressure on the tool holder.

[0048] As can be seen from the above, the high-strength prestressed steel strand shear resistance testing device provided by the present invention utilizes a winding fixing component to achieve stable clamping of the steel strand while simulating its stress state at different working angles as needed. This allows for the comprehensive testing of multiple shear resistance performance indicators in a single test. Compared with the limitation of traditional universal testing machines that can only perform single-angle tests, the device effectively improves the testing efficiency and the comprehensiveness and accuracy of the results. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0050] Figure 2 This is a schematic cross-sectional view of the machine platform for a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0051] Figure 3This is a schematic diagram of a shear test of a high-strength prestressed steel strand under the bending angle state, provided by the present invention.

[0052] Figure 4 This is a schematic diagram of the suspension platform structure of a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0053] Figure 5 This is a schematic diagram of the position structure of the lifting cylinder and the movable cylinder of a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0054] Figure 6 This is a schematic diagram of the winding fixing assembly structure of a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0055] Figure 7 This is a schematic diagram of the adjustable anti-backflow component structure of a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0056] Figure 8 This is a schematic diagram of the movable connecting sleeve structure of a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0057] Figure 9 This is a schematic cross-sectional view of the anti-return box structure of a high-strength prestressed steel strand shear resistance testing device proposed in this invention;

[0058] Figure 10 This is a schematic diagram of the shear test module structure of a high-strength prestressed steel strand shear test device proposed in this invention.

[0059] In the diagram: 1. Machine base; 2. Lead screw; 3. Sliding column; 4. Suspension assembly; 401. Loose cylinder; 402. Lifting cylinder; 403. Suspension; 5. Side frame; 6. Winding fixing assembly; 601. Winding reel; 602. Loose disc; 603. Locking hole; 604. Winding groove; 605. Insert block; 606. Return spring; 607. Conical locking platform; 608. Locking bolt; 609. Rotating shaft; 610. Brake motor; 611. Reducer; 7. Central frame; 8. Adjustable anti-backflow assembly; 801. Turning plate; 802. Bracket; 803. Connecting shaft; 804. Anti-backflow box; 805. Movable connecting sleeve; 806. Threading hole; 807. 808. Pressure block; 809. Wedge-shaped boss; 810. Movable connecting rod; 811. Tilting frame; 812. Mounting block; 813. Functional spring; 9. Panel; 10. Dial; 11. Pointer; 12. Driving gear; 13. Base frame; 14. Adjusting motor; 15. Drive gear; 16. Top platform; 17. Inner plate; 18. Motor base; 19. Drive motor; 20. Drive wheel; 21. Driving wheel; 22. Synchronous toothed belt; 23. Shear test module; 2301. Base plate; 2302. Mounting seat; 2303. Hydraulic cylinder; 2304. Top block; 2305. Pressure sensor; 2306. Knife holder; 2307. Single shear. Detailed Implementation

[0060] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0061] The high-strength prestressed steel strand shear resistance testing device disclosed in this invention is mainly used in scenarios where existing testing equipment cannot simulate the shear stress state of steel strands under different operating angles, resulting in inaccurate test data.

[0062] Reference Figures 1-10 A high-strength prestressed steel strand shear resistance testing device, comprising:

[0063] Machine base 1, on which are installed two lead screws 2 and two sliding columns 3;

[0064] Suspension assembly 4 is mounted on lead screw 2 and sliding column 3. Suspension assembly 4 includes suspension 403, two lifting cylinders 402 and two movable cylinders 401. Suspension 403 is fixedly connected between one lifting cylinder 402 and one movable cylinder 401.

[0065] Two side frames 5 are fixedly connected to the outside of the two movable cylinders 401, and the side frames 5 are L-shaped.

[0066] Two winding fixing components 6 are respectively set on two side frames 5. The two winding fixing components 6 are used to install and fix the same steel strand.

[0067] Two central frames 7 are fixedly connected to the outside of two movable cylinders 401 respectively;

[0068] Two adjustable anti-backflow components 8 are respectively installed on two central frames 7. The two adjustable anti-backflow components 8 are used to prevent the steel strand from springing back after it breaks.

[0069] Specifically, this device utilizes the winding and fixing component 6 to stably clamp the steel strand while simulating its stress state at different working angles as needed. This allows for the comprehensive testing of multiple shear performance indicators in a single test. Compared to the limitations of traditional universal testing machines that can only perform single-angle tests, this device effectively improves testing efficiency and the comprehensiveness and accuracy of the results.

[0070] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6 In a preferred embodiment, the winding fixing assembly 6 includes:

[0071] The winding reel 601 is mounted on the side frame 5 and is located on the outside of the side frame 5.

[0072] The retractable plate 602 is set on the winding plate 601. The retractable plate 602 has two insertion holes. The winding plate 601 is fixedly connected to two insertion blocks 605, which are inserted into the two insertion holes.

[0073] Two return springs 606 are fixedly connected to the winding disc 601. Two recesses are provided on the movable disc 602, and the two return springs 606 are respectively disposed inside the two recesses.

[0074] Two conical locking platforms 607 are fixedly connected to the outer surfaces of the winding disc 601 and the movable disc 602, respectively. The two conical locking platforms 607 are combined to form a frustum-shaped screw with external threads.

[0075] Locking bolts 608 are located on the outside of the two conical locking platforms 607. Locking bolts 608 are used to lock and fix the frustum-shaped screw formed by the combination of the two conical locking platforms 607.

[0076] The winding fixing assembly 6 also includes:

[0077] A winding groove 604 is provided on the winding disc 601 and the movable disc 602. The winding groove 604 is used for winding and storing steel strands.

[0078] A locking hole 603 is provided inside the winding disc 601 and the movable disc 602. The locking hole 603 is L-shaped and passes through the conical locking platform 607 and communicates with the winding groove 604.

[0079] A rotating shaft 609 is fixedly connected to the back of the winding reel 601. A shaft hole is provided on the side frame 5, and the rotating shaft 609 is movably connected to the inside of the shaft hole.

[0080] The brake motor 610 is fixedly connected to the upper side of the side frame 5. The side frame 5 has a motor shaft hole, through which the shaft of the brake motor 610 passes.

[0081] The reducer 611 is fixedly connected to the side frame 5, and the reducer 611 connects the motor shaft and the rotating shaft 609.

[0082] Specifically, after loosening the two locking bolts 608, the two movable discs 602 are raised upwards, inserting the steel strand into the locking hole 603 of one winding disc 601 and passing it out through the locking hole 603 of the other winding disc 601. The remaining length of the steel strand outside the locking hole 603 is adjusted. Then, the two movable discs 602 are pressed down and fixed with the locking bolts 608, and the steel strand is initially installed and fixed. Then, the two brake motors 610 are started simultaneously to drive the two winding discs 601 to rotate. The two winding discs 601 rotate in opposite directions, and the steel strand is wound in the winding groove 604 until the steel strand is taut, thus completing the installation and fixing of the steel strand.

[0083] During the test, two brake motors 610 were started simultaneously to drive the winding disc 601 to rotate, changing the slack of the steel strand between the two winding discs 601. With the help of the shearing blade, shear tests were carried out on the steel strand at different working angles, including: the steel strand in a straight state, the steel strand in an obtuse angle state, the steel strand in a right angle state, and the steel strand in an acute angle state.

[0084] In specific application scenarios, the winding fixing component 6 is suitable for fixing and testing steel strands. The winding fixing component 6 uses the cooperation of the winding disc 601 and the movable disc 602 to fix the steel strands by pressing, locking and winding. Compared with traditional clamping, the steel strands are initially pressed and fixed in the locking holes 603 of the winding disc 601 and the movable disc 602. At the same time, the steel strands wound in the winding groove 604 can further improve the fixing effect by the friction between them. During the test, the steel strands fixed by winding can make the stress distribution at the fixing position of the steel strands more uniform, effectively avoiding damage or breakage caused by local stress concentration, as well as clamping failure caused by this, thereby ensuring the authenticity and accuracy of shear test data under different simulated angles.

[0085] The return spring 606 can assist the lifting of the movable plate 602, which facilitates the installation and disassembly of the steel strand; the cooperative structure of the conical locking platform 607 and the locking bolt 608 enables it to adaptively clamp steel strands of different specifications, improving the versatility of the device.

[0086] Reference Figure 5 , Figure 7 , Figure 8 and Figure 9 In a preferred embodiment, the adjustable anti-backflow assembly 8 includes:

[0087] The turntable 801 is movably connected to the central frame 7, and the turntable 801 can deflect on the central frame 7;

[0088] The bracket 802 is fixedly connected to the rotary table 801, and the front end of the bracket 802 is fixedly connected to the connecting shaft 803;

[0089] Anti-return box 804 is located at the top of connecting shaft 803;

[0090] The movable connecting sleeve 805 is set on the anti-return box 804, and the top end of the connecting shaft 803 is provided with a connector that mates with the movable connecting sleeve 805;

[0091] A wire hole 806 is provided on the anti-backflow box 804, and the wire hole 806 passes through the anti-backflow box 804.

[0092] The adjustable anti-backflow assembly 8 also includes:

[0093] Two pressure blocks 807 are disposed inside the anti-return box 804. The outer surfaces of the two pressure blocks 807 are provided with sliding grooves. The interior of the anti-return box 804 is provided with a slide rail. The two pressure blocks 807 are disposed on the slide rail of the anti-return box 804. The two pressure blocks 807 are located inside the anti-return box 804 and are distributed symmetrically from top to bottom.

[0094] A wedge-shaped boss 808 is provided on one side opposite to the two pressure blocks 807;

[0095] Two flip frames 810 are provided, and the anti-return box 804 has symmetrical mounting positions. The flip frames 810 are movably connected to the mounting positions of the anti-return box 804.

[0096] Two movable connecting rods 809 are set in two mounting positions of the anti-backflow box 804, and the two ends of the movable connecting rods 809 are respectively connected to one end of the flipping frame 810 and the pressure block 807;

[0097] Two functional springs 812 are provided. Grooves are provided on both the upper and lower sides of the anti-return box 804. The other end of the flipping frame 810 is fixedly connected to the mounting block 811. One end of the functional spring 812 is connected to the groove in the anti-return box 804, and the other end of the functional spring 812 is connected to the mounting block 811.

[0098] Specifically, the steel strand installation and fixing process requires passing through the wire holes 806 of the two anti-backflow boxes 804. This process is achieved by pressing the installation block 811 to cause the flipping frame 810 to flip, and the two pressure blocks 807 inside the anti-backflow box 804 to move away from each other, allowing the steel strand to pass through the wire holes 806.

[0099] When a break occurs during the test, the break at the test position in the middle of the steel strand will cause two sections of the steel strand to spring back. At this time, since the two pressure blocks 807 achieve elastic compression of the steel strand inside the anti-backflow box 804, and the wedge-shaped protrusion 808 is tilted towards the middle of the steel strand, when the middle of the steel strand breaks and springs back, the pressure block 807 will effectively stop the steel strand and prevent the steel strand from flying off due to the breakage and springback.

[0100] In specific application scenarios, the adjustable anti-rebound component 8 is suitable for the rebound scenario that occurs when the steel strand breaks during the shear test of the steel strand. The adjustable anti-rebound component 8 uses the symmetrical pressure blocks 807 inside the anti-rebound box 804 to apply a stable pre-pressure to the steel strand from both sides, thereby providing an immediate and effective rebound resistance at the moment of breakage, eliminating the hidden danger of the broken wire flying and injuring people, and significantly improving the safety of the test process.

[0101] The test is conducted in the middle of the steel strand. When the middle of the steel strand is stressed, it will create a pulling effect on both sides. The design of the wedge-shaped boss 808 ensures that it will not cause additional interference to the axial tension state of the steel strand body due to stress during normal test loading. Furthermore, the slight deformation of the steel strand due to stress during the test allows the anti-backflow box 804 to adjust accordingly when the steel strand undergoes slight deformation, thereby further avoiding the influence of additional constraints on the accuracy of the test results.

[0102] Reference Figure 1 , Figure 4 , Figure 5 and Figure 7 In a preferred embodiment, a panel 9 is fixedly connected to the central frame 7, a dial 10 is provided on the panel 9, and a recess is provided on the bracket 802. A pointer 11 is provided inside the recess and is used to indicate the reading of the dial 10.

[0103] A base frame 13 is fixedly connected to the movable cylinder 401. An adjusting motor 14 is fixedly connected to the side of the base frame 13 near the side frame 5. A motor shaft hole is opened on the base frame 13. The output shaft of the adjusting motor 14 passes through the motor shaft hole and is fixedly connected to the drive gear 15. An arc-shaped groove is opened on the outside of the rotating disc 801. A driving gear 12 is fixedly connected inside the arc-shaped groove. The drive gear 15 meshes with the driving gear 12.

[0104] Specifically, when simulating different working angles of the steel strand, the test position of the adjustable anti-backflow component 8 is adjusted, that is: the two adjusting motors 14 are started simultaneously to drive the drive gear 15 to mesh with the traction gear 12, and the rotating disc 801 rotates to drive the bracket 802 to deflect, so as to meet the anti-backflow protection requirements of the shear test under different working angles of the steel strand.

[0105] By observing the reading of pointer 11 on dial 10 on bracket 802, the working angle of the steel strand can be determined.

[0106] Reference Figure 1 , Figure 2 and Figure 3 In a preferred embodiment, a top platform 16 is provided above the machine base 1, a sliding column 3 is fixedly connected between the upper surface of the machine base 1 and the lower surface of the top platform 16, the upper end of the lead screw 2 is movably connected to the lower surface of the top platform 16, two round holes are provided on the machine base 1, and an inner plate 17 is provided inside the machine base 1. The lower ends of the two lead screws 2 pass through the two round holes of the machine base 1 and are movably connected to the upper surface of the inner plate 17. A traction wheel 21 is provided on each of the two lead screws 2, a motor base 18 is provided at the bottom of the machine base 1, a drive motor 19 is fixedly connected to the motor base 18, a motor shaft hole is provided on the inner plate 17, and the output shaft of the drive motor 19 passes through the motor shaft hole of the inner plate 17 and is fixedly connected to the drive wheel 20. The same synchronous toothed belt 22 is provided between the drive wheel 20 and the two traction wheels 21.

[0107] Specifically, the lifting process of the suspension platform 4 is as follows: the drive motor 19 drives the active wheel 20 to rotate, and under the pull of the synchronous toothed belt 22, the two traction wheels 21 rotate synchronously, and the two lead screws 2 rotate to drive the suspension platform 4 to lift.

[0108] Reference Figure 1 , Figure 2 , Figure 3 and Figure 10 In a preferred embodiment, a shear test module 23 is provided on the upper side of the machine 1.

[0109] Shear test module 23 includes:

[0110] The base plate 2301 is fixedly connected to the upper surface of the machine base 1;

[0111] Mounting bracket 2302 is fixedly connected to base plate 2301;

[0112] Hydraulic cylinder 2303 is fixedly connected to mounting base 2302, and top block 2304 is fixedly connected to the telescopic end of hydraulic cylinder 2303.

[0113] The cutter holder 2306 is located above the top block 2304. The cutter holder 2306 is provided with a cutter groove, and a single shear 2307 for unidirectional testing of the shear strength of steel strand is fixedly connected inside the cutter groove.

[0114] Pressure sensor 2305 is disposed between top block 2304 and tool holder 2306. Pressure sensor 2305 is used to record and feedback the pressure on tool holder 2306.

[0115] Specifically, during the test, the hydraulic cylinder 2303 was activated to lift the top block 2304, and the single shear 2307 gradually approached and applied pressure from below the steel strand to conduct a shear test. The shear test data of the steel strand was monitored and fed back in real time by the pressure sensor 2305.

[0116] In specific application scenarios, the shear test module 23 is suitable for the shear test of steel strands. That is, the shear test module 23 adopts a bottom-up shearing method with a single shear 2307, and with the pressure sensor 2305, it can accurately collect and feed back shear force data. This module can adapt to and meet the various shear test requirements under different working angles of simulated steel strands, ensuring the smoothness of the entire comprehensive testing process and the reliability of data results.

[0117] Working principle: After loosening the two locking bolts 608, the two movable discs 602 rise upwards, inserting the steel strand into the locking hole 603 of one winding disc 601 and exiting through the locking hole 603 of the other winding disc 601. Adjust the remaining length of the steel strand outside the locking hole 603, then press down on the two movable discs 602 respectively and fix them with the locking bolts 608. The steel strand is initially installed and fixed. Then, the two brake motors 6 are started simultaneously. 10 drives two winding discs 601 to rotate. The two winding discs 601 rotate in opposite directions. The steel strand is wound in the winding groove 604 until the steel strand is taut, thus completing the installation and fixing of the steel strand. The installation and fixing of the steel strand needs to pass through the wire holes 806 of the two anti-backflow boxes 804. This process is achieved by pressing the installation block 811 to cause the flipping frame 810 to flip, and the two pressure blocks 807 in the anti-backflow box 804 move away from each other, so that the steel strand passes through the wire holes 806.

[0118] During the test, two brake motors 610 are simultaneously started to drive the winding disc 601 to rotate, changing the slack of the steel strand between the two winding discs 601. With the help of the shearing blade, shear tests are carried out on the steel strand at different working angles, including: the steel strand is taut, the steel strand is at an obtuse angle, the steel strand is at a right angle, and the steel strand is at an acute angle. When simulating different working angles of the steel strand, the test position of the adjustable anti-backflow component 8 is adjusted, that is: two adjusting motors 14 are simultaneously started to drive the drive gear 15 to mesh with the traction gear 12, the rotating disc 801 rotates and drives the bracket 802 to deflect, so as to meet the anti-backflow protection requirements of the shear test on the steel strand at different working angles.

[0119] During the test, the hydraulic cylinder 2303 was activated to lift the top block 2304, and the single shear 2307 gradually approached and applied pressure from below the steel strand to conduct the shear test. The shear test data of the steel strand was monitored and fed back in real time by the pressure sensor 2305.

[0120] When a break occurs during the test, the break at the test position in the middle of the steel strand will cause two sections of the steel strand to spring back. At this time, since the two pressure blocks 807 achieve elastic compression of the steel strand inside the anti-backflow box 804, and the wedge-shaped protrusion 808 is tilted towards the middle of the steel strand, when the middle of the steel strand breaks and springs back, the pressure block 807 will effectively stop the steel strand and prevent the steel strand from flying off due to the breakage and springback.

[0121] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A shear resistance testing device for high-strength prestressed steel strand, characterized in that, include: The machine base (1) is equipped with two lead screws (2) and two sliding columns (3); The suspension assembly (4) is set on the lead screw (2) and the sliding column (3). The suspension assembly (4) includes a suspension (403), two lifting cylinders (402) and two movable cylinders (401). The suspension (403) is fixedly connected between one lifting cylinder (402) and one movable cylinder (401). Two side frames (5) are fixedly connected to the outside of two movable cylinders (401), and the side frames (5) are L-shaped; Two winding fixing components (6) are respectively set on two side frames (5), and the two winding fixing components (6) are used to install and fix the same steel strand; Two central frames (7) are fixedly connected to the outside of two movable cylinders (401); Two adjustable anti-backflow components (8) are respectively installed on two central frames (7); The winding fixing assembly (6) includes: A winding reel (601) is mounted on a side frame (5), and the winding reel (601) is located on the outside of the side frame (5); A movable plate (602) is disposed on a winding plate (601). The movable plate (602) has two insertion holes. Two plug blocks (605) are fixedly connected to the winding plate (601). The two plug blocks (605) are inserted into the two insertion holes. Two return springs (606) are fixedly connected to the winding disc (601). The movable disc (602) has two recessed holes, and the two return springs (606) are respectively disposed inside the two recessed holes. Two conical locking platforms (607) are fixedly connected to the outer surfaces of the winding reel (601) and the movable reel (602), respectively. The two conical locking platforms (607) are joined together as the movable reel (602) and the winding reel (601) approach each other to form a frustum-shaped screw with threads on its outer surface. The locking bolt (608) is sleeved on the outside of the frustum-shaped screw after the two conical locking platforms (607) are joined together; The winding fixing assembly (6) further includes: A winding groove (604) is provided on the winding disc (601) and the movable disc (602); A locking hole (603) is provided inside the winding disc (601) and the movable disc (602). The locking hole (603) is L-shaped and passes through the conical locking platform (607) and communicates with the winding groove (604). A rotating shaft (609) is fixedly connected to the back of the winding reel (601). A shaft hole is provided on the side frame (5), and the rotating shaft (609) is movably connected to the inside of the shaft hole. A brake motor (610) is fixedly connected to the upper side of a side frame (5). The side frame (5) has a motor shaft hole, through which the shaft of the brake motor (610) passes. The reducer (611) is fixedly connected to the side frame (5), and the reducer (611) connects the motor shaft and the rotating shaft (609). The adjustable anti-backflow assembly (8) includes: The rotary table (801) is movably connected to the central frame (7); The bracket (802) is fixedly connected to the turntable (801), and the front end of the bracket (802) is fixedly connected to the connecting shaft (803). An anti-return box (804) is disposed at the top of the connecting shaft (803); A movable connecting sleeve (805) is provided on the anti-return box (804), and the top end of the connecting shaft (803) is provided with a connector that mates with the movable connecting sleeve (805); A wire hole (806) is provided on the anti-return box (804), and the wire hole (806) passes through the anti-return box (804). The adjustable anti-backflow assembly (8) also includes: Two pressure blocks (807) are disposed inside the anti-return box (804). The outer surfaces of the two pressure blocks (807) are provided with sliding grooves. The interior of the anti-return box (804) is provided with a slide rail. The two pressure blocks (807) are disposed on the slide rail of the anti-return box (804). The two pressure blocks (807) are located inside the anti-return box (804) and are symmetrically distributed vertically. A wedge-shaped boss (808) is provided on one side opposite to the two pressure blocks (807); Two flip frames (810) are provided, and the anti-return box (804) has symmetrical mounting positions. The flip frames (810) are movably connected to the mounting positions of the anti-return box (804). Two movable connecting rods (809) are set in two mounting positions of the anti-return box (804), and the two ends of the movable connecting rods (809) are respectively connected to one end of the flipping frame (810) and the pressure block (807); Two functional springs (812) are provided. Grooves are provided on both the upper and lower sides of the anti-return box (804). The other end of the flipping frame (810) is fixedly connected to the mounting block (811). One end of the functional spring (812) is connected to the groove of the anti-return box (804), and the other end of the functional spring (812) is connected to the mounting block (811). The upper side of the machine tool (1) is provided with a shear test module (23); The shear test module (23) includes: The base plate (2301) is fixedly connected to the upper surface of the machine base (1); Mounting bracket (2302) is fixedly connected to base plate (2301); A hydraulic cylinder (2303) is fixedly connected to a mounting base (2302), and a top block (2304) is fixedly connected to the telescopic end of the hydraulic cylinder (2303) upwards. The cutter holder (2306) is located above the top block (2304). The cutter holder (2306) has a cutter groove, and a single scissor (2307) for unidirectional testing of the shear strength of steel strand is fixedly connected inside the cutter groove. A pressure sensor (2305) is disposed between the top block (2304) and the tool holder (2306).

2. The high-strength prestressed steel strand shear resistance testing device according to claim 1, characterized in that, A panel (9) is fixedly connected to the central frame (7). A dial (10) is provided on the panel (9), and a recessed hole is provided on the bracket (802). A pointer (11) is provided inside the recessed hole.

3. The high-strength prestressed steel strand shear resistance testing device according to claim 2, characterized in that, A base frame (13) is fixedly connected to the movable cylinder (401). An adjusting motor (14) is fixedly connected to the side of the base frame (13) near the side frame (5). A motor shaft hole is opened on the base frame (13). The output shaft of the adjusting motor (14) passes through the motor shaft hole and is fixedly connected to the drive gear (15). An arc-shaped groove is opened on the outside of the rotating disk (801). A traction gear (12) is fixedly connected inside the arc-shaped groove. The drive gear (15) meshes with the traction gear (12).

4. The high-strength prestressed steel strand shear resistance testing device according to claim 1, characterized in that, A top platform (16) is provided above the machine base (1). A sliding column (3) is fixedly connected between the upper surface of the machine base (1) and the lower surface of the top platform (16). The upper end of the lead screw (2) is movably connected to the lower surface of the top platform (16). Two round holes are opened on the machine base (1), and an inner plate (17) is provided inside the machine base (1). The lower ends of the two lead screws (2) pass through the two round holes of the machine base (1) and are movably connected to the upper surface of the inner plate (17). A traction wheel (21) is provided on both lead screws (2). A motor base (18) is provided at the bottom of the machine base (1). A drive motor (19) is fixedly connected to the motor base (18). A motor shaft hole is opened on the inner plate (17). The output shaft of the drive motor (19) passes through the motor shaft hole of the inner plate (17) and is fixedly connected to the drive wheel (20). The same synchronous toothed belt (22) is provided between the drive wheel (20) and the two traction wheels (21).

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