A prestressed steel strand performance testing device

Abstract

The present invention relates to the technical field of testing equipment, and specifically discloses a prestressed steel strand performance testing device, comprising a machine body and an adjustable test bench mounted on the top of the machine body via an inclination adjustment unit. The top of the adjustable test bench is also provided with a continuous impact unit, a guide unit, and two left-right symmetrical multi-stage clamping units, wherein the multi-stage clamping units include a primary bending clamping assembly, a bending control assembly, and a secondary circumferential clamping assembly. The present invention can perform tensile strength testing and fatigue strength performance testing on the steel strand in a horizontal state, and can also perform tensile strength testing and fatigue strength performance testing on the steel strand in an inclined state; the present invention performs multi-stage clamping and fixing of the steel strand by cooperating with the primary bending clamping assembly and the secondary circumferential clamping assembly, thereby achieving multi-point and multi-directional clamping, ensuring that the steel strand is subjected to uniform clamping force in multiple directions, and preventing the steel strand from sliding during the tensile strength test.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and more particularly to a prestressed steel strand performance detection device. Background Art

[0002] High-strength prestressed steel strand is a key material widely used in bridges, buildings, railways, and other fields. It boasts high tensile strength, excellent relaxation properties, stable linearity, and a uniform internal structure. Quality improvements are achieved during its production through the following methods: 1. SWRS92Si-TP wire rod is selected as the raw material to increase the steel's tensile strength and toughness; 2. The drawing speed is reduced during the drawing process to minimize deformation shock and improve cooling; 3. A greater proportion of online tension is employed to ensure the linearity and relaxation properties of the finished high-strength prestressed steel strand. To ensure the production quality of high-strength prestressed steel strand, tensile strength and fatigue strength testing are performed during the manufacturing process.

[0003] At present, the tensile strength and fatigue strength test of steel strands is carried out by first taking two steel strands and installing them on the fixtures of the tensile testing machine and fatigue testing machine respectively. Then, tension and cyclic load are applied to the two steel strands respectively until the steel strands break. In this way, the tensile strength and fatigue strength performance tests are completed. However, this testing method still has certain defects:

[0004] 1. Currently, both tensile strength testing and fatigue strength performance testing are mainly performed on steel strands in a vertical or horizontal state. However, in actual engineering applications (such as bridges, cranes, etc.), steel strands are in an inclined state. The steel strands in the inclined state will be subjected to multi-directional forces including axial tension, radial force and tangential force. In addition, the stress distribution of the steel strands in the inclined state is different from that in the vertical or horizontal state. Therefore, in the absence of tilted state testing, it is impossible to evaluate the impact of multi-directional forces on the performance of the steel strands.

[0005] 2. Currently, before the tensile strength test of the steel strand, the steel strand is first placed in the clamping groove of the clamp so that the center line of the steel strand coincides with the center line of the clamp and then the steel strand is clamped. However, since the direction of the pulling force during the test is the same as the axial direction of the steel strand, as the pulling force gradually increases, the degree of wear on the contact surface between the clamp and the steel strand will increase, which will lead to the risk of slippage between the steel strand and the clamp, resulting in inaccurate or interrupted performance testing. Summary of the Invention

[0006] The present invention provides a prestressed steel strand performance detection device, which solves the technical problem of lack of testing of the inclination state of the steel strand in the prior art.

[0007] The present invention provides a performance detection device for prestressed steel strands, which includes a machine body and an adjustable test bench installed on the top of the machine body through an inclination adjustment unit. A hydraulic cylinder is fixedly installed on the top of the adjustable test bench, and a rotation unit is arranged at the output end of the hydraulic cylinder. A continuous impact unit, a guiding unit, and two multi-stage clamping units that are symmetric left and right are also arranged on the top of the adjustable test bench. The multi-stage clamping unit includes a first-stage bending clamping component, a bending control component, a second-stage circumferential clamping component, a拨动 control component, and a driving component two for driving the bending control component and the拨动 control component. The continuous impact unit includes an impact component, and the inclination adjustment unit includes an adjustment component and a driving component one for driving the adjustment component.

[0008] The driving component one includes two mounting boxes fixedly installed on the top of the machine body and symmetric front and back. The adjustable test bench is located between the two mounting boxes. The adjustment component includes an adjustment sleeve slidably connected in the mounting box and a hinge plate fixedly installed on the top of the adjustment sleeve and hinged to the adjustable test bench. A mounting seat is fixedly installed on the top of the machine body and located on the right side of the adjustable test bench. Two hinge rods that are symmetric front and back are hinged on the mounting seat, and the hinge rods are hinged to the adjustable test bench.

[0009] Furthermore, the driving component one further includes a screw rod rotatably installed between the left and right inner walls of the mounting box. The adjustment sleeve is threadedly connected to the outside of the screw rod. The left end of the front mounting box is fixedly installed with an adjustment motor. The output shaft of the adjustment motor slidably penetrates through the front mounting box and is fixedly connected to the screw rod. The right end of the screw rod slidably penetrates through the mounting box and is fixedly sleeved with a pulley, and a belt is传动连接 between the two pulleys.

[0010] Furthermore, the first-stage bending clamping component includes two L-shaped plates that are symmetric front and back and a rotating shaft rotatably installed between the two L-shaped plates. A folding line wheel and a C-shaped frame are fixedly installed on the outside of the rotating shaft. The folding line wheel is located inside the C-shaped frame and is同轴 with the rotating shaft. A small cylinder one is fixedly installed on the top of the C-shaped frame, and a pressing block that配合 with the folding line wheel is fixedly installed at the output end of the small cylinder one.

[0011] Furthermore, the bending control component includes two ear plates that are symmetric front and back and located on the side of the rotating shaft close to the center of the adjustable test bench, and a rack fixedly installed on the side of the ear plate close to the rotating shaft. Both ends of the rotating shaft penetrate through the L-shaped plate and are fixedly sleeved with gears that啮合 with the rack.

[0012] Furthermore, the second-stage circumferential clamping component includes a slide rail fixedly installed between the two L-shaped plates and located on the side of the L-shaped plate far from the rotating shaft, and the slide rail is located on the side of the ear plate far from the corresponding rotating shaft. Two clamping blocks that are symmetric front and back and用于夹持钢绞线 are slidably connected in the slide rail.

[0013] Furthermore, the toggle control assembly includes a control wheel with a control groove on the outside, two pairs of mounting plates fixedly installed on the side of the slide rail away from the clamping block and symmetrical front and back, a mounting shaft fixedly installed between the same pair of mounting plates, a toggle block rotatably installed on the outside of the mounting shaft, two toggle grooves symmetrical front and back are opened on the side of the slide rail away from the clamping block, the toggle block is L-shaped, and the two ends of the toggle block extend into the control groove and the corresponding toggle groove respectively, the slide rail is provided with a receiving groove located between the two toggle grooves and above the control wheel on the side away from the clamping block, the second drive assembly includes a small cylinder 2 fixedly installed in the receiving groove, the output end of the small cylinder 2 is fixedly installed with a movable plate, the movable plate and the ear plate are both fixedly installed on the outside of the control wheel, the middle of the slide rail and the center of the control wheel are provided with threading holes for the steel wire rope to pass through, and the two threading holes are concentric, and the movable plate is located on the side of the toggle block close to the corresponding rotating shaft.

[0014] Furthermore, the continuous impact unit also includes a reciprocating component, a driving component for driving the impact component and a gantry fixedly installed on the top of the adjustable test bench, the impact component includes a fixed plate fixedly installed between the front and rear inner walls of the gantry and a return spring fixedly installed at the bottom of the fixed plate, a circular ring is fixedly installed at the bottom end of the return spring, a sliding rod is fixedly installed inside the circular ring, the top end of the sliding rod slides through the fixed plate, and the bottom end of the sliding rod is fixedly installed with an impact wheel.

[0015] Furthermore, the drive component three includes a mounting sleeve and a drive motor fixedly installed in the mounting sleeve, an eccentric sleeve is rotatably installed on the outer side of the output shaft of the drive motor, a connecting rod hinged to the top of the slide rod is rotatably installed on the front side of the eccentric sleeve, a round rod is fixedly installed on the front side of the eccentric sleeve, and the hinge point between the connecting rod and the eccentric sleeve is located on the side of the round rod away from the output shaft of the drive motor, and a fixed sleeve at the front end of the output shaft of the drive motor is provided with a toggle sleeve rod for toggling the round rod, and the toggle sleeve rod is located between the eccentric sleeve and the connecting rod.

[0016] Furthermore, the reciprocating assembly includes fixed frames fixedly installed on the left and right sides of the gantry and a reciprocating screw rod rotatably installed between the two fixed frames. The outer side of the reciprocating screw rod is threadedly connected to a reciprocating sleeve, and the mounting sleeve is fixedly installed at the bottom of the reciprocating sleeve.

[0017] Furthermore, the torsion unit includes a fixed sleeve fixedly installed on the output end of the hydraulic cylinder and a rotating frame rotatably installed on the right side of the fixed sleeve, the rotating frame is fixedly connected to the slide rail on the left, and the slide rail on the right is fixedly installed on the top of the adjustable test bench. A control motor is fixedly installed in the fixed sleeve, and the output shaft of the control motor is fixedly connected to the rotating frame. The guide unit includes two guide rails fixedly installed on the top of the adjustable test bench and symmetrical front and back and a slider slidably connected to the top of the guide rails, and a support plate fixedly installed on the top of the slider is fixedly connected to the fixed sleeve.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention can perform tensile strength testing and fatigue strength performance testing on steel strands in a horizontal state, as well as in an inclined state, to simulate the situation where steel strands are in an inclined state in actual engineering applications (such as bridges, cranes, etc.), evaluate the impact of multi-directional forces on the performance of steel strands, effectively increase the diversity of testing through multi-mode testing in multiple states, better fit the actual use of steel strands, and achieve improved accuracy of test results, thereby making the test results more authentic and representative.

[0020] 2. The present invention performs multi-stage clamping and fixing of the steel strands by cooperating with the primary bending clamping assembly and the secondary circumferential clamping assembly, thereby achieving multi-point and multi-directional clamping, ensuring that the steel strands are subjected to uniform clamping forces in multiple directions, and greatly increasing the friction between the steel strands and the clamping blocks and the folding wheels, thereby avoiding sliding of the steel strands during the tensile strength test, ensuring that the test operation is carried out smoothly and efficiently, and improving the accuracy of the test results.

[0021] 3. The present invention bends the steel strand through a primary bending and clamping assembly, so that the bent steel strand can be constrained by radial and tangential forces. This multi-directional force distribution forms a geometric locking effect, which not only increases the friction between the steel strand and the bending wheel, but also can more effectively prevent the steel strand from sliding, significantly improving the stability of the steel strand in the tensile strength test, thereby greatly improving the accuracy of the test results.

[0022] 4. The present invention can realistically simulate the dynamic loads and impact loads that steel strands may encounter in actual applications through continuous impact testing, and at the same time cooperate with tensile strength testing to further make the test results more authentic and representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the installation box, screw, pulley, belt and adjustment motor part of the present invention.

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the hydraulic cylinder, adjustable test bench, support plate and gantry frame of the present invention.

[0026] Figure 4 It is a partial three-dimensional structural diagram of the guide rail, slide frame, fixing sleeve, primary bending clamping assembly and bending control assembly of the present invention.

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the control motor, rotating frame, gear, rack and slide rail of the present invention.

[0028] Figure 6 It is a schematic three-dimensional structure diagram of the clamping block, small cylinder 1, pressing block, folding wheel and small cylinder 2 of the present invention.

[0029] Figure 7 It is a schematic three-dimensional structure diagram of the mounting shaft,拨动 block, control wheel,拨动 groove and clamping block of the present invention.

[0030] Figure 8 It is a schematic three-dimensional structure diagram of the continuous impact unit of the present invention.

[0031] Figure 9 It is a schematic three-dimensional structure diagram of the reciprocating screw rod, reciprocating sleeve, mounting sleeve and driving motor of the present invention.

[0032] In the figure: 1, body; 2, inclination adjustment unit; 201, adjustment component; 202, driving component 1; 2011, adjustment sleeve; 2012, hinged plate; 2013, mounting seat; 2014, hinged rod; 2021, mounting box; 2022, screw rod; 2023, pulley; 20^, belt; 2025, adjustment motor; 3, adjustable test bench; 4, hydraulic cylinder; 5, multi-stage clamping unit; 6, continuous impact unit; 7, twisting unit; 8, guiding unit; 9, steel strand; 501, first-stage bending clamping component; 502, bending control component; 503, second-stage circumferential clamping component; 504,拨动 control component; 505, driving component 2; 5011, L-shaped plate; 5012, rotating shaft; 5013, folding wheel; 5014, C-shaped frame; 5015, small cylinder 1; 5016, pressing block; 5021, ear plate; 5022, rack; 5023, gear; 5031, slide rail; 5032, clamping block; 5041, mounting plate; 5042, mounting shaft; 5043,拨动 block; 5044, control wheel; 5045,拨动 groove; 5051, small cylinder 2; 5052, moving plate; 601, impact component; 602, driving component 3; 603, reciprocating component; 604, gantry; 6011, fixing plate; 6012, return spring; 6013, ring; 6014, impact wheel; 6015, slide bar; 6021, mounting sleeve; 6022, driving motor; 6023, eccentric sleeve plate; 6024, connecting rod; 6025, round rod; 6,拨动 sleeve rod; 6031, fixing frame; 6032, reciprocating screw rod; 6033, reciprocating sleeve; 701, fixing sleeve; 702, control motor; 703, rotating frame; 801, guide rail; 802, slider; 803, support plate. Detailed implementation method

[0033] Reference will now be made to example embodiments to discuss the subject matter described herein. It should be understood that these embodiments are discussed so that those skilled in the art can better understand and thus implement the subject matter described herein. Changes can be made to the functions and arrangements of the elements discussed without departing from the scope of protection of the content of this specification. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0034] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 , a prestressed steel strand performance detection device, comprising a machine body 1 and an adjustable test bench 3 installed on the top of the machine body 1 through an inclination adjustment unit 2. A hydraulic cylinder 4 is fixedly installed on the top of the adjustable test bench 3, and a twisting unit 7 is arranged at the output end of the hydraulic cylinder 4. A continuous impact unit 6, a guiding unit 8, and two multi-stage clamping units 5 that are symmetric left and right are also arranged on the top of the adjustable test bench 3. The multi-stage clamping unit 5 includes a first-stage bending clamping component 501, a bending control component 502, a second-stage circumferential clamping component 503, a拨动 control component 504, and a drive component two 505 for driving the bending control component 502 and the拨动 control component 504. The continuous impact unit 6 includes an impact component 601, and the inclination adjustment unit 2 includes an adjustment component 201 and a drive component one 202 for driving the adjustment component 201.

[0035] Refer to Figure 4 , [[ID=1十九]] Figure 5 , Figure 6 and Figure 7 , the first-stage bending clamping component 501 includes two L-shaped plates 5011 that are symmetric front and back and a rotating shaft 5012 rotatably installed between the two L-shaped plates 5011. A folding line wheel 5013 and a C-shaped frame 5014 are fixedly installed on the outside of the rotating shaft 5012. The folding line wheel 5013 is located inside the C-shaped frame 5014, and the folding line wheel 5013 is coaxial with the rotating shaft 5从. A small cylinder one 5015 is fixedly installed on the top of the C-shaped frame 从, and a pressing block 5016 that cooperates with the folding line wheel 5013 is fixedly installed at the output end of the small cylinder one 5015.

[0036] Refer to Figure 4 , Figure 5 , [[ID=三十二]] Figure 6 and Figure 7 , the bending control component 502 includes two ear plates 5021 that are symmetric front and back and are located on the side of the rotating shaft 5012 close to the center of the adjustable test bench 3, and a rack 5022 fixedly installed on the side of the ear plate 5021 close to the rotating shaft 5012. Both ends of the rotating shaft 5012 penetrate through the L-shaped plate 5011 and are fixedly sleeved with gears 5023 that mesh with the rack 5022. It should be noted that there is an unclear term "拨动 control component" in the original text. It might need to be further clarified for a more accurate translation.

[0037] See Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The secondary circumferential clamping assembly 503 includes a slide rail 5031 fixedly installed between two L-shaped plates 5011 and located on the side of the L-shaped plate 5011 away from the rotating shaft 5012, and the slide rail 5031 is located on the side of the ear plate 5021 away from the corresponding rotating shaft 5012, and two clamping blocks 5032 are symmetrically connected in front and back and used to clamp the steel strand 9 in a sliding connection inside the slide rail 5031.

[0038] See Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The toggle control assembly 504 includes a control wheel 5044 with a control groove on the outside, two pairs of mounting plates 5041 fixedly mounted on the side of the slide rail 5031 away from the clamping block 5032 and symmetrical front and back, a mounting shaft 5042 fixedly mounted between the same pair of mounting plates 5041, a toggle block 5043 is rotatably mounted on the outside of the mounting shaft 5042, two toggle grooves 5045 symmetrical front and back are opened on the side of the slide rail 5031 away from the clamping block 5032, the toggle block 5043 is L-shaped, and the two ends of the toggle block 5043 extend into the control groove and the corresponding toggle groove 5045 respectively, and a receiving groove located between the two toggle grooves 5045 and above the control wheel 5044 is opened on the side of the slide rail 5031 away from the clamping block 5032.

[0039] See Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The driving component 2 505 includes a small cylinder 2 5051 fixedly installed in the accommodating groove, and a movable plate 5052 is fixedly installed on the output end of the small cylinder 2 5051. The movable plate 5052 and the ear plate 5021 are both fixedly installed on the outside of the control wheel 5044. The middle part of the slide rail 5031 and the center of the control wheel 5044 are provided with threading holes for the steel strand 9 to pass through, and the two threading holes are concentric. The movable plate 5052 is located on the side of the toggle block 5043 close to the corresponding rotating shaft 5012.

[0040] See Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7The torsion unit 7 includes a fixed sleeve 701 fixedly mounted on the output end of the hydraulic cylinder 4 and a rotating frame 703 rotatably mounted on the right side of the fixed sleeve 701, the rotating frame 703 is fixedly connected to the slide rail 5031 on the left, and the slide rail 5031 on the right is fixedly mounted on the top of the adjustable test bench 3. A control motor 702 is fixedly mounted in the fixed sleeve 701, and the output shaft of the control motor 702 is fixedly connected to the rotating frame 703. The guide unit 8 includes two guide rails 801 fixedly mounted on the top of the adjustable test bench 3 and symmetrical front and back, and a slider 802 slidably connected to the top of the guide rails 801. A support plate 803 fixedly mounted on the top of the slider 802 is fixedly connected to the fixed sleeve 701. A tension sensor (not shown in the figure) is arranged between the output end of the hydraulic cylinder 4 and the fixed sleeve 701.

[0041] During specific use, in the initial state, the U-shaped frame 5014 and the small cylinder 5015 are located below the folding wheel 5013. First, one end of the steel strand 9 to be detected is passed through the slide rail 5031 and the control wheel 5044 in sequence between the two clamping blocks 5032 on the left side, and then wound from between the folding wheel 5013 and the pressing block 5016 to the outside of the folding wheel 5013. Then, the small cylinder 5015 is started, and the output end of the small cylinder 5015 pushes the pressing block 5016 to press the steel strand 9 against the folding wheel 5013. Next, the small cylinder 5051 is started, and the output end of the small cylinder 5051 pushes the moving plate 5052 to move towards the side close to the folding wheel 5013, thereby带动 the control wheel 5044 to move synchronously, and then挤压 the拨动块 5043 through the control groove, causing the拨动块 5043 to rotate around the mounting shaft 5042. The ends of the two拨动块 5043 located in the拨动槽 5045 approach each other, so that the two拨动块 5043 push the two clamping blocks 5032 towards each other to clamp and fix the steel strand 9 at the first level. At the same time, during the process of the control wheel 5044 moving towards the side close to the folding wheel 5013, it will also带动 the two ear plates 5021 to move synchronously. The rack 5022 drives the gear 5023 to带动 the rotating shaft 5012 to rotate, and then带动 the U-shaped frame 5014 to rotate upwards, causing the pressing block 5016 to rotate synchronously and带动 the folding wheel 5013 and the steel strand 9 pressed against the folding wheel 5013 by the pressing block 5016 to rotate upwards synchronously, thereby causing the steel strand 9 to bend, and clamping and bending and fixing the steel strand 9 at the second level. Then, the other end of the steel strand 9 is passed through the slide rail 5031 and the control wheel 5044 in sequence between the two clamping blocks 5032 on the right side, and then wound from between the folding wheel 5013 and the pressing block 5016 to the outside of the folding wheel 5013. Then, repeat the above multi-level clamping and fixing operation to complete the multi-level clamping and fixing of the other end of the steel strand 9. Through the clamping and bending and fixing at the second level, the contact area between the steel strand 9 and the folding wheel 5013 can be increased, thereby increasing the friction force. At the same time, the bent steel strand 9 can be restricted by radial and tangential forces. The multi-directional force distribution can more effectively prevent the steel strand 9 from sliding during the stretching process, and the bent steel strand 9 forms a geometric locking effect, making the position of the steel strand 9 more fixed.

[0042] Since the steel strand 9 may undergo slight bending, twisting or irregular deformation during production, transportation and storage, in order to improve the subsequent detection accuracy, after the steel strand 9 is multi-level clamped and fixed, the control motor 702 is started. The output shaft of the control motor 702 rotates to带动 the rotating frame 703 to rotate slightly, thereby带动 the slide rail 5031 on the left side to rotate slightly, and then带动 the multi-level clamped and fixed steel strand 9 to rotate and twist slightly. By rotating and twisting slightly, the initial stress generated by the steel strand 9 during production, transportation and storage can be released, so that the steel strand 9 is in a more uniform state before testing.

[0043] After the stress release is completed, the hydraulic cylinder 4 is started, and the output end of the hydraulic cylinder 4 contracts, driving the fixed sleeve 701 to move to the left, and at the same time driving the support plate 803 and the slider 802 to slide to the left along the guide rail 801, thereby driving the rotating frame 703 to move to the left, and then driving the left slide rail 5031 to move to the left, so that the multi-stage clamped and twisted steel strand 9 is pulled to the left. As the output end of the hydraulic cylinder 4 continues to contract, the tension received by the steel strand 9 gradually increases. When the steel strand 9 breaks, the tension value of the tension sensor at this time is recorded, which is the maximum tensile strength of the steel strand 9.

[0044] See Figure 1 、 Figure 3 、 Figure 8 and Figure 9 The continuous impact unit 6 also includes a reciprocating component 603, a driving component 3 602 for driving the impact component 601 and a gantry 604 fixedly installed on the top of the adjustable test bench 3. The impact component 601 includes a fixed plate 6011 fixedly installed between the front and rear inner walls of the gantry 604 and a return spring 6012 fixedly installed at the bottom of the fixed plate 6011. A ring 6013 is fixedly installed at the bottom end of the return spring 6012, and a slide rod 6015 is fixedly installed in the ring 6013. The top end of the slide rod 6015 slides through the fixed plate 6011, and the bottom end of the slide rod 6015 is fixedly installed with an impact wheel 6014, and a pressure sensor (not shown in the figure) is provided on the impact wheel 6014.

[0045] See Figure 1 、 Figure 3 、 Figure 8 and Figure 9 The drive component three 602 includes a mounting sleeve 6021 and a drive motor 6022 fixedly mounted in the mounting sleeve 6021. An eccentric sleeve 6023 is rotatably mounted on the outer side of the output shaft of the drive motor 6022. A connecting rod 6024 hinged to the top of the slide bar 6015 is rotatably mounted on the front side of the eccentric sleeve 6023. A round rod 6025 is fixedly mounted on the front side of the eccentric sleeve 6023. The hinge point between the connecting rod 6024 and the eccentric sleeve 6023 is located on the side of the round rod 6025 away from the output shaft of the drive motor 6022. A toggle sleeve rod 6026 for toggling the round rod 6025 is provided on the fixed sleeve at the front end of the output shaft of the drive motor 6022. The toggle sleeve rod 6026 is located between the eccentric sleeve 6023 and the connecting rod 6024.

[0046] See Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 and Figure 9The reciprocating assembly 603 includes a fixed frame 6031 fixedly installed on the left and right sides of the gantry 604 and a reciprocating screw rod 6032 rotatably installed between the two fixed frames 6031. The outer side of the reciprocating screw rod 6032 is threadedly connected to a reciprocating sleeve 6033, and the mounting sleeve 6021 is fixedly installed at the bottom of the reciprocating sleeve 6033.

[0047] In specific use, after the maximum tensile strength test of the steel strand 9 is completed, another steel strand 9 from the same batch is taken and the multi-stage clamping and stress release operation is performed on the steel strand 9 in the same manner. After the stress release is completed, the output end of the hydraulic cylinder 4 is controlled to drive the fixing sleeve 701 to move left, so that the multi-stage clamped and twisted steel strand 9 is pulled to the left and straightened, and then the hydraulic cylinder 4 is stopped. Then, the drive motor 6022 is started, and the output shaft of the drive motor 6022 rotates to drive the toggle sleeve rod 6026 to rotate and toggle the round rod 6025 upward, driving the eccentric sleeve plate 6023 to rotate accordingly, and then driving the top end of the connecting rod 6024 to rotate upward, thereby pulling the sliding rod 6015 to drive the impact wheel 6014 to move upward and compress the return spring 6012. ( Figure 9 The figure shows the state when the return spring 6012 is gradually compressed, rather than the initial state figure). When the toggle sleeve 6026 toggles the round rod 6025 until the round rod 6025 begins to rotate downward, the upward compressive force on the return spring 6012 disappears and the return spring 6012 is reset under the action of the rebound force and gravity. The toggle sleeve 6026 is separated from the round rod 6025, and the impact wheel 6014 moves downward quickly to impact the steel strand 9. When the toggle sleeve 6026 continues to rotate and toggles the round rod 6025 upward again, the above compression of the return spring 6012 and the return spring 6012 are repeated. The positioning spring 6012 is reset and drives the impact wheel 6014 to impact the steel strand 9. As the output shaft of the drive motor 6022 continues to rotate, the impact wheel 6014 is driven to continuously impact the steel strand 9 until the steel strand 9 breaks. At the same time, as the impact wheel 6014 continues to impact, the number of impacts when the steel strand 9 breaks is recorded. At the same time, the pressure sensor detects the impact force generated during the impact to evaluate the fatigue strength performance of the steel strand 9. Through continuous impact, the dynamic load and impact load that the steel strand 9 may encounter in actual applications can be truly simulated.

[0048] See Figure 1 、 Figure 2 and Figure 3The driving component 202 includes two mounting boxes 2021 fixedly mounted on the top of the body 1 and symmetrically arranged front and back. The adjustable test bench 3 is located between the two mounting boxes 2021. The adjusting component 201 includes an adjusting sleeve 2011 slidably connected to the mounting box 2021 and a hinged plate 2012 fixedly mounted on the top of the adjusting sleeve 2011 and hinged to the adjustable test bench 3. A mounting seat 2013 located on the right side of the adjustable test bench 3 is fixedly mounted on the top of the body 1. Two hinged rods 2014 symmetrically arranged front and back are hinged on the mounting seat 2013. The hinged rods 2014 are hinged to the adjustable test bench 3.

[0049] See Figure 1 、 Figure 2 and Figure 3 The driving component 202 also includes a screw 2022 rotatably installed between the left and right inner walls of the installation box 2021, the adjusting sleeve 2011 is threadedly connected to the outside of the screw 2022, and the left end of the front installation box 2021 is fixedly installed with an adjusting motor 2025. The output shaft of the adjusting motor 2025 slides through the front installation box 2021 and is fixedly connected to the screw 2022. The right end of the screw 2022 slides through the installation box 2021 and is fixedly provided with a pulley 2023, and a belt 2024 is connected between the two pulleys 2023.

[0050] During specific use, after the steel strand 9 has been tested for tensile strength and fatigue strength performance in a horizontal state, a new steel strand 9 is taken for multi-stage clamping and stress release operations. Then, the adjusting motor 2025 is started, and the output shaft of the adjusting motor 2025 rotates to drive the front screw 2022 to rotate, thereby driving the front pulley 2023 to rotate. The front pulley 2023 rotates through the belt 2024 to drive the rear pulley 2023 to rotate, so that the two screws 2022 rotate synchronously, and then drive the adjusting sleeve 2011 threadedly connected to the screw 2022 to slide to the right, so that the hinge plate 2012 moves to the right and drives the adjustable test platform 3 to squeeze the hinge rod 2014 and the adjustable test platform 3. Due to the height of the hinge between the adjustable test platform 3 and the hinge plate 2012 The height of the hinged plate 2014 is lower than the height of the hinged joint between the hinged rod 2014 and the adjustable test platform 3. Therefore, as the adjustable test platform 3 moves to the right, the hinged rod 2014 and the adjustable test platform 3 will rotate, lifting the adjustable test platform 3, thereby causing the adjustable test platform 3 to tilt, and in turn causing the steel strand 9 to tilt. The adjustment motor 2025 is then stopped, and the tensile strength and fatigue strength performance of the steel strand 9 are tested in the tilted state. By performing tensile strength and fatigue strength tests in the tilted state, the maximum bearing capacity of the steel strand 9 at different tilt angles can be evaluated, thereby helping to understand the tensile strength performance of the steel strand 9 under different working conditions that may be encountered in actual engineering applications (such as bridges, cranes, etc., where the steel strand 9 may be in a tilted state), thereby making the test results more representative. It should be noted that when the hinged plate 2012 initially moves to the right, the right end of the adjustable test platform 3 can also be manually lifted to allow the adjustable test platform 3 to tilt smoothly.

[0051] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all embodiments. However, obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A prestressed steel strand performance testing device, characterized in that: include: A machine body (1) and an adjustable test bench (3) mounted on the top of the machine body (1) via an inclination adjustment unit (2), a hydraulic cylinder (4) fixedly mounted on the top of the adjustable test bench (3), a torsion unit (7) provided at the output end of the hydraulic cylinder (4), a continuous impact unit (6), a guide unit (8) and two left-right symmetrical multi-stage clamping units (5) further provided on the top of the adjustable test bench (3), the multi-stage clamping units (5) comprising a primary bending clamping assembly (501), a bending control assembly (502), a secondary circumferential clamping assembly (503), a toggle control assembly (504) and a second driving assembly (505) for driving the bending control assembly (502) and the toggle control assembly (504). ), the continuous impact unit (6) includes an impact component (601), the tilt adjustment unit (2) includes an adjustment component (201) and a driving component (202) for driving the adjustment component (201); the twisting unit (7) includes a fixed sleeve (701) fixedly mounted on the output end of the hydraulic cylinder (4) and a rotating frame (703) rotatably mounted on the right side of the fixed sleeve (701); the guide unit (8) includes two guide rails (801) fixedly mounted on the top of the adjustable test bench (3) and symmetrical in front and back, and a slider (802) slidably connected to the top of the guide rails (801), and a support plate (803) fixedly mounted on the top of the slider (802) and fixedly connected to the fixed sleeve (701); The driving component 1 (202) includes two mounting boxes (2021) fixedly mounted on the top of the machine body (1) and symmetrical in front and back, the adjustable test bench (3) is located between the two mounting boxes (2021), the adjustment component (201) includes an adjustment sleeve (211) slidably connected in the mounting box (221) and a hinge plate (212) fixedly mounted on the top of the adjustment sleeve (211) and hinged to the adjustable test bench (3), a mounting seat (213) located on the right side of the adjustable test bench (3) is fixedly mounted on the top of the machine body (1), two hinged rods (214) symmetrical in front and back are hinged to the mounting seat (213), and the hinged rods (214) are hinged to the adjustable test bench (3); The hydraulic cylinder (4) is started, and the output end of the hydraulic cylinder (4) contracts, driving the fixed sleeve (701) to move leftward, and at the same time driving the support plate (803) and the slider (802) to slide leftward along the guide rail (801), thereby driving the rotating frame (703) to move leftward, so that the multi-stage clamped and twisted steel strand (9) is pulled leftward; After the tensile strength and fatigue strength tests of the steel strand (9) are carried out when the adjustable test bench (3) is in a horizontal state, the drive component 1 (202) drives the adjustment sleeve (2011) to slide to the right so that the adjustable test bench (3) drives the steel strand (9) to tilt, and then the tensile strength and fatigue strength tests of the steel strand (9) in the tilted state are carried out.

2. The prestressed steel strand performance testing device according to claim 1, characterized in that: The first driving component (202) further includes a screw rod (2022) rotatably installed between the left and right inner walls of the installation box (2021). An adjusting sleeve (2011) is threadedly connected to the outside of the screw rod (2022). On the left side of the front installation box (2021), an adjusting motor (2025) is fixedly installed. The output shaft of the adjusting motor (2025) slidably penetrates through the front installation box (2021) and is fixedly connected to the screw rod (2022). The right end of the screw rod (2022) slidably penetrates through the installation box (2021) and is fixedly sleeved with a pulley (2023). A belt (2024) is drivingly connected between the two pulleys (2023).

3. The prestressed steel strand performance testing device according to claim 1, characterized in that: The first-level bending clamping component (501) includes two L-shaped plates (5011) symmetrically arranged front and back and a rotating shaft (5012) rotatably installed between the two L-shaped plates (5011). On the outside of the rotating shaft (5012), a folding line wheel (5013) and a U-shaped frame (5014) are fixedly installed. The folding line wheel (5013) is located inside the U-shaped frame (5014), and the folding line wheel (5013) is coaxial with the rotating shaft (5012). On the top of the U-shaped frame (5014), a first small air cylinder (5) is fixedly installed. The output end of the first small air cylinder (5015) is fixedly installed with a pressing block (5016) that cooperates with the folding line wheel (5013).

4. The prestressed steel strand performance testing device according to claim 3, characterized in that: The bending control component (502) includes two ear plates (5021) symmetrically arranged front and back and located on the side of the rotating shaft (5012) close to the center of the adjustable test bench (3), and a rack (5022) fixedly installed on the side of the ear plate (5021) close to the rotating shaft (5012). Both ends of the rotating shaft (5012) penetrate through the L-shaped plate (5011) and are fixedly sleeved with gears (5023) that mesh with the rack (5022).

5. The prestressed steel strand performance testing device according to claim 4, characterized in that: The second-level circumferential clamping component (s) includes a slide rail (5031) fixedly installed between the two L-shaped plates (5011) and located on the side of the L-shaped plate (5011) away from the rotating shaft (5012), and the slide rail (5031) is located on the side of the ear plate (5021) away from the corresponding rotating shaft (5012). Inside the slide rail (5031), two clamping blocks (5032) symmetrically arranged front and back and used for clamping the steel strand (9) are slidably connected.

6. The prestressed steel strand performance testing device according to claim 5, characterized in that: The toggle control assembly (504) comprises a control wheel (5044) with a control groove on the outside, two pairs of mounting plates (5041) fixedly mounted on the side of the slide rail (5031) away from the clamping block (5032) and symmetrical in front and back, a mounting shaft (5042) fixedly mounted between the same pair of mounting plates (5041), a toggle block (5043) rotatably mounted on the outside of the mounting shaft (5042), two toggle grooves (5045) symmetrical in front and back are opened on the side of the slide rail (5031) away from the clamping block (5032), the toggle block (5043) is L-shaped, and the two ends of the toggle block (5043) extend into the control groove and the corresponding toggle groove (5045) respectively, and the slide rail (5031) is away from the clamping block (5032). A receiving groove is provided on one side of the clamping block (5032), which is located between the two toggle grooves (5045) and above the control wheel (5044). The second driving component (505) includes a second small cylinder (5051) fixedly installed in the receiving groove. A movable plate (5052) is fixedly installed on the output end of the second small cylinder (5051). The movable plate (5052) and the ear plate (5021) are both fixedly installed on the outside of the control wheel (5044). A threading hole for the steel strand (9) to pass through is provided in the middle of the slide rail (5031) and at the center of the control wheel (5044). The two threading holes are concentric. The movable plate (5052) is located on the side of the toggle block (5043) close to the corresponding rotating shaft (5012).

7. The prestressed steel strand performance testing device according to claim 1, characterized in that: The continuous impact unit (6) further comprises a reciprocating assembly (603), a driving assembly (602) for driving the impact assembly (601), and a gantry (604) fixedly mounted on the top of the adjustable test bench (3), wherein the impact assembly (601) comprises a fixed plate (6011) fixedly mounted between the front and rear inner walls of the gantry (604) and a return spring (6012) fixedly mounted on the bottom of the fixed plate (6011), a circular ring (6013) fixedly mounted on the bottom end of the return spring (6012), a sliding rod (6015) fixedly mounted inside the circular ring (6013), the top end of the sliding rod (6015) slidingly passes through the fixed plate (6011), and the bottom end of the sliding rod (6015) fixedly mounted on the impact wheel (6014).

8. The prestressed steel strand performance testing device according to claim 7, characterized in that: The drive assembly three (602) comprises a mounting sleeve (6021) and a drive motor (6022) fixedly mounted in the mounting sleeve (6021); an eccentric sleeve (6023) is rotatably mounted on the outer side of the output shaft of the drive motor (6022); a connecting rod (6024) hinged to the top end of the slide rod (6015) is rotatably mounted on the front side of the eccentric sleeve (6023); a round rod (6025) is fixedly mounted on the front side of the eccentric sleeve (6023); a hinge point between the connecting rod (6024) and the eccentric sleeve (6023) is located on a side of the round rod (6025) away from the output shaft of the drive motor (6022); a toggle sleeve rod (6026) for toggling the round rod (6025) is provided on the fixed sleeve at the front end of the output shaft of the drive motor (6022); and the toggle sleeve rod (6026) is located between the eccentric sleeve (6023) and the connecting rod (6024).

9. The prestressed steel strand performance testing device according to claim 8, characterized in that: The reciprocating assembly (603) comprises fixed frames (6031) fixedly mounted on the left and right sides of the gantry (604) and a reciprocating screw rod (6032) rotatably mounted between the two fixed frames (6031). The outer side of the reciprocating screw rod (6032) is threadedly connected to a reciprocating sleeve (6033), and the mounting sleeve (6021) is fixedly mounted on the bottom of the reciprocating sleeve (6033).

10. The prestressed steel strand performance testing device according to claim 5, characterized in that: The rotating frame (703) is fixedly connected to the left slide rail (5031), and the right slide rail (5031) is fixedly installed on the top of the adjustable test bench (3). A control motor (702) is fixedly installed in the fixed sleeve (701), and the output shaft of the control motor (702) is fixedly connected to the rotating frame (703).

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