Method and equipment for testing multi-angle inclined fixed rebound strength of laminated slab

Abstract

The invention discloses a method and equipment for testing the multi-angle inclination fixed rebound strength of a laminated slab, relates to the technical field of laminated slab detection, and aims to solve the problems that the existing laminated slab rebound test is carried out horizontally and cannot reflect the actual inclination working condition, and the existing device is poor in adaptability, unstable in fixation and low in detection precision. The equipment comprises a base, a supporting column, a carrying table, an angle inclination adjusting assembly, a clamping and fixing assembly, a vertical frame, an X-axis adjusting assembly, a Y-axis adjusting assembly, an electric telescopic rod, a springback testing assembly, a perpendicularity calibration assembly, a telescopic assembly and a controller. Multi-angle inclination of the carrying table is achieved through the angle inclination adjusting assembly, the clamping and fixing assembly stably fixes the laminated plate, the perpendicularity calibration assembly ensures that the testing axis is perpendicular to the testing surface, and multi-position testing is completed in cooperation with the X-axis adjusting assembly and the Y-axis adjusting assembly. The device can truly simulate the actual inclination working condition of the laminated slab, is adaptive to laminated slabs of different specifications, improves the fixing stability and detection precision, and guarantees the safety of a building structure.

Description

Technical Field

[0001] This invention belongs to the field of composite slab testing technology, specifically, it relates to a method and equipment for testing the rebound strength of composite slabs with multi-angle tilting and fixing. Background Technology

[0002] As a core component of prefabricated buildings, the concrete rebound strength of composite slabs directly determines the load-bearing capacity and safety of the building structure. The rebound method, as a simple, low-cost, and non-destructive testing method that does not damage the structure, is widely used in the strength testing of composite slabs. Its core principle is based on the correlation between the surface hardness of concrete and its compressive strength. The compressive strength is estimated by measuring the ratio of the rebound distance of the hammer to the distance of the impact rod before impact (i.e., the rebound value).

[0003] Currently, the rebound strength test of composite slabs mostly adopts the horizontal placement and fixing method. However, in actual engineering, composite slabs are often in a tilted state at different angles during hoisting, installation and use. The stress mode of composite slabs in the tilted state is significantly different from that in the horizontal state. The rebound strength test based solely on the horizontal state cannot truly reflect its strength performance under actual working conditions, which can easily lead to the test results being out of touch with the actual working conditions and pose safety hazards.

[0004] While there are a few existing rebound testing devices for concrete specimens at arbitrary angles, these devices are only suitable for small specimens and cannot be adapted to composite slabs of different specifications. At the same time, the existing devices have poor stability and are prone to slippage and shaking of the composite slab during tilting, resulting in large rebound test errors. In addition, the existing testing equipment does not consider the perpendicularity calibration of the rebound hammer and the test surface when the composite slab is tilted, which further affects the detection accuracy.

[0005] There are currently no effective solutions to the problems in the relevant technologies.

[0006] Therefore, in order to solve the above problems, the present invention provides a method and equipment for testing the springback strength of composite plates with multi-angle tilting and fixing. Summary of the Invention

[0007] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a method and equipment for testing the springback strength of composite plates with multi-angle tilting and fixing.

[0008] The objective of this invention can be achieved through the following technical solutions: A multi-angle inclined fixed springback strength testing device for composite slabs includes a base and further includes: A support column is fixed to the top of the base; A platform, installed at the top of the support column, is used to support the composite slab; An angle tilt adjustment component is disposed on one side of the bottom end of the platform, and is used to drive the platform to tilt relative to the horizontal plane to a preset angle; A clamping and fixing assembly is disposed on the platform for releasably clamping and fixing the laminated plate to the surface of the platform; An upright frame is mounted on the base and spans above the platform. A telescopic component for adjusting its angle is installed at the bottom end of the upright frame. The X-axis adjustment assembly is installed on the upright frame; The Y-axis adjustment component is mounted on the X-axis adjustment component and is driven by the X-axis adjustment component to move along the first horizontal direction; An electric telescopic rod is mounted on the Y-axis adjustment assembly and is driven by the Y-axis adjustment assembly to move along the second horizontal direction; A springback testing assembly is installed at the telescopic end of the electric telescopic rod and is used to test the springback strength of the composite plate. A verticality calibration component is set on the Y-axis adjustment component and the platform to detect and ensure that the test axis of the springback test component is perpendicular to the test surface of the composite plate. The controller, which is fixed on the upright, is electrically connected to the angle tilt adjustment component, clamping and fixing component, X-axis adjustment component, Y-axis adjustment component, electric telescopic rod, springback test component, verticality calibration component and telescopic component respectively.

[0009] As a preferred embodiment of the present invention, a connecting seat is fixedly installed at the bottom end of the platform, and the top end of the support column is movably connected to the connecting seat.

[0010] As a preferred embodiment of the present invention, the angle tilt adjustment assembly includes a hollow column, a worm gear, a first lead screw, a lifting column, a dual-head motor, a transmission rod, a worm gear, a support seat, and a limiting seat; The hollow column is fixedly installed on the base. The top end of the lifting column is connected to the bottom end of the limiting seat, and its bottom end is slidably disposed inside the hollow column. The first lead screw is rotatably disposed inside the hollow column and threadedly engaged with the lifting column. The worm gear is disposed inside the hollow column and coaxially fixed to the first lead screw. The dual-head motor is fixed on the base. One end of the transmission rod is connected to one output end of the dual-head motor. The worm is fixed to the other end of the transmission rod and meshes with the worm gear. The support seat is fixed on the base and rotatably connected to the transmission rod.

[0011] As a preferred embodiment of the present invention, the clamping and fixing assembly includes an insert plate, a second lead screw, a limiting plate, a pressure sensor, a handwheel, and an ear plate; The insert plate is inserted into the slot at the top of the platform. The second lead screw is threaded into the insert plate. The limiting plate is located at one end of the second lead screw. The pressure sensor is embedded in the clamping surface of the limiting plate to detect the clamping force. A handwheel is installed at the other end of the second lead screw. Ear plates are fixedly installed at both ends of the insert plate.

[0012] As a preferred embodiment of the present invention, the X-axis adjustment assembly includes a third lead screw, a first movable block, a first motor, and a guide rod; The third lead screw is rotatably mounted between the two sets of uprights. The first motor is fixed to one of the sets of uprights, and its output end is connected to the third lead screw. The guide rod is fixed between the two sets of uprights and is arranged parallel to the third lead screw. The first movable block is threadedly connected to the third lead screw and slidably mounted on the guide rod. The Y-axis adjustment assembly is mounted on the first movable block.

[0013] As a preferred embodiment of the present invention, the Y-axis adjustment assembly includes a guide rail frame, a second motor, a fourth lead screw, and a second movable block; The guide rail frame is fixedly installed at the bottom end of the first movable block, the fourth lead screw is rotatably installed inside the guide rail frame, the second motor is fixed at one end of the guide rail frame, its output end is connected to the fourth lead screw, and the second movable block is threadedly connected to the fourth lead screw and slides with the guide rail frame. The electric telescopic rod is fixed to the bottom end of the second movable block.

[0014] As a preferred embodiment of the present invention, the verticality calibration component includes a horizontal plate, a laser emitter, and a laser receiver; The horizontal plate is fixed to one side of the guide rail frame, the laser emitter is fixedly installed at the bottom end of the horizontal plate, and the laser receiver is installed on the platform to receive the laser signal emitted by the laser emitter.

[0015] A method for testing the springback strength of composite plates with multi-angle tilting and fixing based on the above-mentioned equipment includes the following steps: S1. Placement of the composite plate to be tested: Place the composite plate to be tested on the bearing surface of the stage, and clamp and fix the composite plate with the clamping and fixing components until the pressure value detected by the pressure sensor of the clamping and fixing components reaches the preset threshold, thus completing the fixing of the composite plate. S2, Platform Angle Adjustment: The angle tilt adjustment component is activated by the controller, and the lifting column is driven by the dual-head motor to move up and down. The lifting column, in conjunction with the rotational connection between the support column and the platform, drives the platform to rotate around the top of the support column, thereby adjusting the platform's angle tilt until the platform is adjusted to the preset test angle. Then, the controller controls the dual-head motor to stop working. S3. Verticality calibration: The telescopic component is activated by the controller to adjust the angle of the stand, and the laser emitter of the verticality calibration component is activated simultaneously until the laser emitted by the laser emitter is vertically projected onto the test surface of the composite plate, and the laser signal received by the laser receiver is the preset standard signal, thus completing the verticality calibration between the springback test component and the test surface of the composite plate. S4. Rebound strength test: The telescopic drive is activated by the controller, which pushes the rebound test component to move towards the test surface of the composite plate, so that the rebound test component contacts the test surface of the composite plate and completes the impact operation. The rebound value of the rebound test component is recorded to complete a single test. Then, the X-axis adjustment component and Y-axis adjustment component are activated by the controller to drive the telescopic drive and the rebound test component to move in the X-axis and Y-axis directions, and complete the rebound strength test of the composite plate at multiple positions under the same tilt angle. S5. Multi-position and multi-angle test: Repeat steps S2-S4, adjust the platform to different preset tilt angles, and complete the springback strength test of the composite plate at different tilt angles. S6. Test data processing: Collect rebound values ​​at different tilt angles and test locations, and calculate the compressive strength of the composite slab under different tilt conditions by combining the correlation formula between concrete rebound strength and rebound value. Complete the multi-angle tilt fixed rebound strength test of the entire composite slab.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses an angle tilt adjustment component to drive the platform to tilt to a preset angle, realistically simulating different tilt states of the composite plate during hoisting, installation and use, so that the test results match the actual working conditions and eliminate safety hazards.

[0017] 2. The present invention, through the cooperation of an adjustable clamping and fixing component with a platform, can stably clamp stacked plates of different sizes, thereby improving the versatility and adaptability of the device.

[0018] 3. In this invention, the clamping and fixing component detects the clamping force through a pressure sensor and controls it within a preset threshold, ensuring that the composite plate remains stable during tilting and testing, thereby reducing testing errors.

[0019] 4. This invention can accurately detect and calibrate the perpendicularity between the springback test component and the test surface of the composite plate through the perpendicularity calibration component, thereby further improving the detection accuracy and ensuring the accuracy of the test results. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the platform of the present invention; Figure 3 This is a schematic diagram of the angle tilt adjustment component structure of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is a schematic diagram of the clamping and fixing assembly structure of the present invention; Figure 6 This is a schematic diagram of the X-axis adjustment component structure of the present invention; Figure 7 This is a schematic diagram of the Y-axis adjustment component of the present invention.

[0022] Figure label: 1. Base; 2. Support column; 3. Platform; 301. Connecting seat; 4. Angle tilt adjustment assembly; 401. Hollow column; 402. Worm gear; 403. First lead screw; 404. Lifting column; 405. Dual-head motor; 406. Transmission rod; 407. Worm gear; 408. Support seat; 409. Limiting seat; 5. Clamping and fixing assembly; 501. Insert plate; 502. Second lead screw; 503. Limiting plate; 504. Pressure sensor; 505. Handwheel; 506. Ear plate; 6. 7. Upright frame; 8. X-axis adjustment assembly; 701. Third lead screw; 702. First movable block; 703. First motor; 704. Guide rod; 9. Y-axis adjustment assembly; 10. Guide rail frame; 11. Second motor; 12. Fourth lead screw; 13. Second movable block; 14. Electric telescopic rod; 15. Springback test assembly; 16. Controller; 17. Verticality calibration assembly; 18. Horizontal plate; 19. Laser emitter; 10. Laser receiver; 11. Telescopic assembly. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention: Example: Please refer to Figure 1-7According to an embodiment of the present invention, a multi-angle tilting and fixed rebound strength testing device for composite plates includes a base 1, a support column 2, a platform 3, an angle tilting adjustment component 4, a clamping and fixing component 5, a stand 6, an X-axis adjustment component 7, a Y-axis adjustment component 8, an electric telescopic rod 9, a rebound testing component 10, a controller 11, a verticality calibration component 12, and a telescopic component 13.

[0024] Specifically, the base 1 is made of Q235 high-strength steel in one piece, with anti-slip pads on the bottom to effectively increase friction with the ground, ensuring the stability of the overall equipment and preventing shaking or displacement during testing. The support column 2 adopts a seamless steel pipe structure and is fixed to the top of the base 1 with high-strength bolts. The top of the support column 2 and the connecting seat 301 at the bottom of the platform 3 are movably connected by a stainless steel rotating shaft. Wear-resistant bearings are installed at the connection points of the rotating shaft, the connecting seat 301, and the support column 2 to reduce rotational wear, allowing the platform 3 to rotate flexibly around the top of the support column 2, achieving angle tilt adjustment within the range of 0-60° to meet the tilt angle requirements of the composite plate in actual working conditions.

[0025] Specifically, the angle tilt adjustment component 4 is located on one side of the bottom end of the platform 3, and includes a hollow column 401, a worm gear 402, a first lead screw 403, a lifting column 404, a dual-head motor 405, a transmission rod 406, a worm gear 407, a support seat 408, and a limit seat 409. The hollow column 401 is made of seamless steel pipe and is fixedly installed on the base 1 by welding, keeping it parallel to the support column 2. The top end of the lifting column 404 is detachably connected to the bottom end of the limit seat 409 by bolts, which is convenient for later maintenance. Its bottom end is slidably set inside the hollow column 401, and the outer wall of the lifting column 404 is tightly fitted to the inner wall of the hollow column 401 to prevent shaking. The first lead screw 403 is rotatably mounted inside the hollow column 401 via a deep groove ball bearing. The lead screw surface has precision threads that precisely engage with the threaded holes inside the lifting column 404. The worm gear 402 is housed inside the hollow column 401 and coaxially fixed to the bottom end of the first lead screw 403 via a flat key, ensuring synchronous transmission. The dual-head motor 405 is a servo motor, bolted to the base 1. Its speed can be precisely adjusted via the controller 11. One end of the transmission rod 406 is connected to one output end of the dual-head motor 405 via a flexible coupling, which buffers the impact force during transmission. The worm gear 407 is fixed to the other end of the transmission rod 406 via a flat key, precisely meshing with the worm gear 402. The transmission ratio is set to 1:20, achieving speed reduction and torque increase, ensuring smooth lifting of the lifting column 404. The support base 408 is welded to the base 1, and an internal bearing is rotatably connected to the transmission rod 406, supporting the transmission rod 406 and preventing bending deformation during rotation, further ensuring transmission stability.

[0026] Specifically, the clamping and fixing assembly 5 is symmetrically arranged on one side of the platform 3, which can clamp the composite plate in one direction. It includes an insert plate 501, a second lead screw 502, a limiting plate 503, a pressure sensor 504, a handwheel 505, and an ear plate 506. The top of the platform 3 has a parallel slot along the width direction, and the insert plate 501 is inserted into the slot. The second lead screw 502 is a trapezoidal threaded lead screw, which is threadedly engaged with the threaded hole in the middle of the insert plate 501. It rotates smoothly and has a self-locking function to prevent loosening after clamping. The limiting plate 503 is bolted to one end of the second lead screw 502. The clamping surface of the limiting plate 503 is attached with an anti-slip rubber pad, which can increase the friction with the composite plate and prevent damage to the surface of the composite plate. The pressure sensor 504 is embedded in the center of the clamping surface of the limiting plate 503. It is a miniature pressure sensor that can detect the clamping force in real time and transmit the signal to the controller 11. The other end of the second lead screw 502 is equipped with an anti-slip handwheel 505, which is convenient for manual adjustment of the clamping force. Both ends of the insert plate 501 are fixedly installed with ear plates 506 by welding. The operator can hold the ear plates 506 to easily pick up or put down the insert plate 501.

[0027] Specifically, the upright frame 6 adopts a portal frame structure, spanning above the platform 3. Telescopic components 13 for adjusting its angle are installed on both sides of the bottom of the upright frame 6. These telescopic components 13 are small electric telescopic cylinders, with a model adapted to the overall size of the equipment. Both ends are hinged to the base 1 and the upright frame 6 respectively via hinged seats, allowing for flexible extension and retraction to adjust the angle of the upright frame 6, ensuring the operability of subsequent verticality calibration. The X-axis adjustment component 7 is installed on the crossbeam of the upright frame 6 and includes a third lead screw 701, a first movable block 702, a first motor 703, and a guide rod 704. The third lead screw 701 is rotatably mounted between the columns of the two sets of upright frames 6 via two bearing seats. The surface of the lead screw is rust-proofed. The first motor 703 is a stepper motor, fixed to one set of upright frames 6 by bolts. Its output end is connected to one end of the third lead screw 701 via a coupling, enabling precise speed control. The guide rod 704 is an optical axis, which is fixed between the columns of the two sets of uprights 6 by bolts and is set parallel to the third lead screw 701. A linear bearing is set at the mating point between the guide rod 704 and the first movable block 702 to reduce sliding friction. The first movable block 702 is threaded to the third lead screw 701 and slidably sleeved on the guide rod 704. The guide rod 704 can effectively restrict the rotation of the first movable block 702 and ensure that it moves smoothly along the X-axis.

[0028] Specifically, the Y-axis adjustment component 8 is vertically mounted at the bottom end of the first movable block 702, perpendicular to the X-axis adjustment component 7, forming a cross-shaped adjustment structure. This structure includes a guide rail frame 801, a second motor 802, a fourth lead screw 803, and a second movable block 804. The guide rail frame 801 is bolted to the bottom end of the first movable block 702 and has an internal groove adapted to the second movable block 804. The fourth lead screw 803 is rotatably mounted within the groove of the guide rail frame 801 via a bearing, perpendicular to the third lead screw 701 in the X-axis direction. The second motor 802 is the same model as the first motor 703, both being stepper motors. It is bolted to one end of the guide rail frame 801, and its output end is connected to the fourth lead screw 803 via a coupling, enabling precise movement control in the Y-axis direction. The second movable block 804 is threaded onto the fourth lead screw 803 and slides within the groove of the guide rail frame 801. The inner wall of the groove is coated with a wear-resistant coating to extend its service life. The electric telescopic rod 9 is fixed to the bottom of the second movable block 804 by bolts. An electric push rod that can precisely control the telescopic amount is selected. The telescopic stroke can be adjusted according to the thickness of the composite plate. The rebound test assembly 10 is installed at the telescopic end of the electric telescopic rod 9. The rebound test assembly 10 adopts a digital display rebound meter, which can transmit the detected rebound value to the controller 11 in real time, accurately record the test data, and avoid errors from manual reading.

[0029] Specifically, the perpendicularity calibration component 12 is correspondingly mounted on the Y-axis adjustment component 8 and the stage 3, and is used to accurately calibrate the perpendicularity between the springback test component 10 and the test surface of the composite plate. It includes a horizontal plate 1201, a laser emitter 1202, and a laser receiver 1203. The horizontal plate 1201 is bolted to one side of the guide rail frame 801, maintaining perpendicularity to the guide rail frame 801. The laser emitter 1202 is bolted to the bottom end of the horizontal plate 1201, with its emission direction vertically downwards, consistent with the test axis of the springback test component 10. The laser receiver 1203 is mounted on the stage 3, corresponding vertically to the laser emitter 1202. It receives the laser signal emitted by the laser emitter 1202 and converts the signal into an electrical signal, transmitting it to the controller 11. When the laser is vertically projected onto the test surface of the composite plate, the laser signal received by the laser receiver 1203 reaches a preset standard, achieving accurate perpendicularity calibration. The controller 11 is a PLC controller, which is fixed to the column of the frame 6 by bolts. The surface is equipped with an operation panel and a display screen, which can display the working status and test data of each component in real time. The controller 11 is electrically connected to the angle tilt adjustment component 4, the clamping and fixing component 5, the X-axis adjustment component 7, the Y-axis adjustment component 8, the electric telescopic rod 9, the springback test component 10, the verticality calibration component 12, and the telescopic component 13 through shielded wires to avoid signal interference and realize the coordinated and precise work of each component.

[0030] A method for testing the springback strength of composite plates with multi-angle tilting and fixing based on the above-mentioned equipment includes the following steps: S1. Placement of the composite plate to be tested: Place the composite plate to be tested on the bearing surface of the stage 3, and clamp and fix the composite plate by the clamping and fixing assembly 5 until the pressure value detected by the pressure sensor 504 of the clamping and fixing assembly 5 reaches the preset threshold, thus completing the fixing of the composite plate. S2, Platform Angle Adjustment: The angle tilt adjustment component 4 is activated by the controller 11, and the lifting column 404 is driven by the dual-head motor 405 to perform lifting and lowering movements. The lifting column 404, in conjunction with the rotational connection between the support column 2 and the platform 3, drives the platform 3 to rotate around the top of the support column 2, thereby realizing the angle tilt adjustment of the platform 3. After the platform 3 is adjusted to the preset test angle, the controller 11 controls the dual-head motor 405 to stop working. S3, Verticality calibration: The angle of the stand 6 is adjusted by starting the telescopic component 13 through the controller 11, and the laser emitter 1202 of the verticality calibration component 12 is started simultaneously until the laser emitted by the laser emitter 1202 is vertically projected onto the test surface of the composite plate, and the laser signal received by the laser receiver 1203 is a preset standard signal, thus completing the verticality calibration between the springback test component 10 and the test surface of the composite plate. S4. Rebound strength test: The telescopic drive component 9 is activated by the controller 11. The telescopic drive component 9 pushes the rebound test component 10 towards the test surface of the composite plate, so that the rebound test component 10 contacts the test surface of the composite plate and completes the impact operation. The rebound value of the rebound test component 10 is recorded to complete a single test. Then, the X-axis adjustment component 7 and Y-axis adjustment component 8 are activated by the controller 11 to drive the telescopic drive component 9 and the rebound test component 10 to move in the X-axis and Y-axis directions, and complete the rebound strength test of the composite plate at multiple positions under the same tilt angle. S5. Multi-position and multi-angle test: Repeat steps S2-S4, adjust the platform 3 to different preset tilt angles, and complete the springback strength test of the composite plate under different tilt angles. S6. Test data processing: Collect rebound values ​​at different tilt angles and test locations, and calculate the compressive strength of the composite slab under different tilt conditions by combining the correlation formula between concrete rebound strength and rebound value. Complete the multi-angle tilt fixed rebound strength test of the entire composite slab.

[0031] The working principle of a multi-angle tilting and fixed rebound strength testing device for composite plates is as follows: First, the composite plate to be tested is placed on the bearing surface of the platform 3, and the composite plate is fixed by the clamping and fixing assembly 5. The handwheel 505 is rotated to drive the second lead screw 502 to rotate. The second lead screw 502 pushes the limiting plate 503 to move towards the composite plate until the pressure value detected by the pressure sensor 504 reaches the preset threshold. The controller 11 receives the signal from the pressure sensor 504 to complete the stable fixing of the composite plate and avoid slippage and shaking during the test. Subsequently, the angle tilt adjustment component 4 is activated by the controller 11. The dual-head motor 405 starts and drives the transmission rod 406 to rotate. The transmission rod 406 drives the worm gear 407 to rotate. The worm gear 407 meshes with the worm wheel 402, driving the worm wheel 402 and the first lead screw 403 fixed on the same axis to rotate. The first lead screw 403 is threadedly engaged with the lifting column 404, driving the lifting column 404 to move up and down along the hollow column 401. The lifting column 404 supports one end of the platform 3 through the limit seat 409. With the movable connection between the support column 2 and the connecting seat 301, the platform 3 is driven to rotate around the top of the support column 2, realizing the angle tilt adjustment of the platform 3. After the platform 3 is adjusted to the preset test angle, the controller 11 controls the dual-head motor 405 to stop working, completing the angle positioning of the platform 3. Next, verticality calibration is performed. The controller 11 activates the telescopic assembly 13, which extends and retracts, causing the upright 6 to rotate around its connection point with the base 1. Simultaneously, the laser emitter 1202 of the verticality calibration assembly 12 is activated. The laser emitter 1202 emits a laser, and the laser receiver 1203 receives the laser signal and transmits it to the controller 11. When the laser is projected vertically onto the test surface of the laminated plate, the laser signal received by the laser receiver 1203 is a preset standard signal. The controller 11 controls the telescopic assembly 13 to stop working, completing the verticality calibration between the springback test assembly 10 and the test surface of the laminated plate, ensuring the accuracy of the springback test. After calibration, the controller 11 starts the electric telescopic rod 9. The telescopic end of the electric telescopic rod 9 pushes the rebound test component 10 towards the test surface of the composite plate, so that the rebound test component 10 contacts the test surface of the composite plate and completes the impact operation. The rebound test component 10 transmits the detected rebound value to the controller 11 for recording, completing a single test. Afterwards, the controller 11 starts the X-axis adjustment component 7 and the Y-axis adjustment component 8. The first motor 703 starts and drives the third lead screw 701 to rotate, driving the first movable block 702 to move along the guide rod 704 in the X-axis direction. The second motor 802 starts and drives the fourth lead screw 803 to rotate, driving the second movable block 804 to move along the guide rail frame 801 in the Y-axis direction, thereby driving the electric telescopic rod 9 and the rebound test component 10 to move, completing the rebound strength test of the composite plate at multiple positions under the same tilt angle. Repeat the above steps of platform angle adjustment, verticality calibration and rebound test, adjust platform 3 to different preset tilt angles, and complete the rebound strength test of the composite slab at different tilt angles; finally, controller 11 collects the rebound values ​​at different tilt angles and different test positions, and calculates the compressive strength of the composite slab under different tilt states by combining the correlation formula between concrete rebound strength and rebound value, and completes the multi-angle tilt fixed rebound strength test of the entire composite slab.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-angle inclined fixed rebound strength testing device for composite slabs, comprising a base (1), characterized in that, Also includes: Support column (2) is fixed to the top of the base (1); The platform (3) is installed at the top of the support column (2) and is used to support the composite plate; An angle tilt adjustment component (4) is disposed on one side of the bottom end of the platform (3) and is used to drive the platform (3) to tilt relative to the horizontal plane to a preset angle. A clamping and fixing assembly (5) is disposed on the platform (3) for releasably clamping and fixing the laminated plate to the surface of the platform (3); The upright frame (6) is set on the base (1) and spans above the platform (3). The bottom end of the upright frame (6) is equipped with a telescopic component (13) for adjusting its angle. The X-axis adjustment assembly (7) is installed on the upright frame (6); The Y-axis adjustment component (8) is mounted on the X-axis adjustment component (7) and is driven by the X-axis adjustment component (7) to move along the first horizontal direction; An electric telescopic rod (9) is installed on the Y-axis adjustment assembly (8) and is driven by the Y-axis adjustment assembly (8) to move along the second horizontal direction; The springback test assembly (10) is installed at the telescopic end of the electric telescopic rod (9) and is used to test the springback strength of the composite plate. A verticality calibration component (12) is set on the Y-axis adjustment component (8) and the stage (3) to detect and ensure that the test axis of the springback test component (10) is perpendicular to the test surface of the composite plate; The controller (11) is fixed on the stand (6) and is electrically connected to the angle tilt adjustment assembly (4), the clamping and fixing assembly (5), the X-axis adjustment assembly (7), the Y-axis adjustment assembly (8), the electric telescopic rod (9), the rebound test assembly (10), the verticality calibration assembly (12), and the telescopic assembly (13), respectively.

2. The multi-angle inclined fixed springback strength testing device for composite plates according to claim 1, characterized in that: The bottom end of the platform (3) is fixedly installed with a connecting seat (301), and the top end of the support column (2) is movably connected to the connecting seat (301).

3. The multi-angle inclined fixed springback strength testing device for composite plates according to claim 1, characterized in that: The angle tilt adjustment assembly (4) includes a hollow column (401), a worm gear (402), a first lead screw (403), a lifting column (404), a dual-head motor (405), a transmission rod (406), a worm gear (407), a support seat (408), and a limit seat (409). The hollow column (401) is fixedly installed on the base (1). The top end of the lifting column (404) is connected to the bottom end of the limiting seat (409), and its bottom end is slidably disposed in the hollow column (401). The first lead screw (403) is rotatably disposed in the hollow column (401) and threadedly engaged with the lifting column (404). The worm gear (402) is disposed in the hollow column (401) and coaxially fixed on the first lead screw (403). The dual-head motor (405) is fixed on the base (1). One end of the transmission rod (406) is connected to one output end of the dual-head motor (405). The worm (407) is fixed on the other end of the transmission rod (406) and meshes with the worm gear (402). The support seat (408) is fixed on the base (1) and rotatably connected to the transmission rod (406).

4. The multi-angle inclined fixed springback strength testing device for composite plates according to claim 1, characterized in that: The clamping and fixing assembly (5) includes a insert plate (501), a second lead screw (502), a limiting plate (503), a pressure sensor (504), a handwheel (505), and an ear plate (506). The insert plate (501) is inserted into the slot at the top of the platform (3). The second lead screw (502) is threaded into the insert plate (501). The limiting plate (503) is set at one end of the second lead screw (502). The pressure sensor (504) is embedded in the clamping surface of the limiting plate (503) for detecting the clamping force. A handwheel (505) is installed at the other end of the second lead screw (502). Ear plates (506) are fixedly installed at both ends of the insert plate (501).

5. The multi-angle inclined fixed springback strength testing device for composite plates according to claim 1, characterized in that: The X-axis adjustment assembly (7) includes a third lead screw (701), a first movable block (702), a first motor (703), and a guide rod (704). The third lead screw (701) is rotatably mounted between the two sets of uprights (6). The first motor (703) is fixed to one of the sets of uprights (6), and its output end is connected to the third lead screw (701). The guide rod (704) is fixed between the two sets of uprights (6) and is arranged parallel to the third lead screw (701). The first movable block (702) is threadedly connected to the third lead screw (701) and slidably mounted on the guide rod (704). The Y-axis adjustment component (8) is mounted on the first movable block (702).

6. The multi-angle inclined fixed springback strength testing device for composite plates according to claim 5, characterized in that: The Y-axis adjustment assembly (8) includes a guide rail frame (801), a second motor (802), a fourth lead screw (803), and a second movable block (804). The guide rail frame (801) is fixedly installed at the bottom end of the first movable block (702), the fourth lead screw (803) is rotatably disposed inside the guide rail frame (801), the second motor (802) is fixed at one end of the guide rail frame (801), its output end is connected to the fourth lead screw (803), and the second movable block (804) is threadedly connected to the fourth lead screw (803) and slides with the guide rail frame (801); The electric telescopic rod (9) is fixed to the bottom end of the second movable block (804).

7. The multi-angle inclined fixed springback strength testing device for composite plates according to claim 6, characterized in that: The verticality calibration component (12) includes a horizontal plate (1201), a laser emitter (1202), and a laser receiver (1203). The horizontal plate (1201) is fixed on one side of the guide rail frame (801), the laser emitter (1202) is fixedly installed at the bottom of the horizontal plate (1201), and the laser receiver (1203) is installed on the platform (3) to receive the laser signal emitted by the laser emitter (1202).

8. A method for testing the springback strength of a composite plate with multi-angle tilting fixation based on the device described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Placement of the composite plate to be tested: Place the composite plate to be tested on the bearing surface of the stage (3), and clamp and fix the composite plate by clamping and fixing assembly (5) until the pressure value detected by the pressure sensor (504) of clamping and fixing assembly (5) reaches the preset threshold, and the fixing of the composite plate is completed. S2, Platform Angle Adjustment: The angle tilt adjustment component (4) is activated by the controller (11), and the lifting column (404) is driven by the dual-head motor (405) to perform lifting and lowering movements. The lifting column (404) cooperates with the rotational connection between the support column (2) and the platform (3) to drive the platform (3) to rotate around the top of the support column (2) to realize the angle tilt adjustment of the platform (3) until the platform (3) is adjusted to the preset test angle, and then the controller (11) controls the dual-head motor (405) to stop working. S3, Verticality calibration: The telescopic component (13) is activated by the controller (11) to adjust the angle of the stand (6), and the laser emitter (1202) of the verticality calibration component (12) is activated simultaneously until the laser emitted by the laser emitter (1202) is vertically projected onto the test surface of the composite plate, and the laser signal received by the laser receiver (1203) is a preset standard signal, thus completing the verticality calibration between the springback test component (10) and the test surface of the composite plate; S4. Rebound strength test: The telescopic drive component (9) is started by the controller (11). The telescopic drive component (9) pushes the rebound test component (10) to move towards the test surface of the composite plate, so that the rebound test component (10) contacts the test surface of the composite plate and completes the impact operation. The rebound value of the rebound test component (10) is recorded to complete a single test. Then, the X-axis adjustment component (7) and Y-axis adjustment component (8) are started by the controller (11) to drive the telescopic drive component (9) and the rebound test component (10) to move in the X-axis and Y-axis directions, and complete the rebound strength test of multiple positions of the composite plate at the same tilt angle. S5. Multi-position and multi-angle test: Repeat steps S2-S4, adjust the platform (3) to different preset tilt angles, and complete the springback strength test of the composite plate under different tilt angles. S6. Test data processing: Collect rebound values ​​at different tilt angles and test locations, and calculate the compressive strength of the composite slab under different tilt conditions by combining the correlation formula between concrete rebound strength and rebound value. Complete the multi-angle tilt fixed rebound strength test of the entire composite slab.

Images