A concrete splitting strength testing apparatus

Abstract

The utility model discloses a kind of concrete splitting strength detection equipment, including workbench, operation box, control box, feeding device, collection tank, cleaning device, workbench top is sequentially provided with the operation box and control box connected with each other from left to right;Operation box is equipped with test piece positioning mechanism and the support plate for supporting the top of test piece, loading pressure plate is oppositely arranged above support plate, loading hydraulic cylinder is vertically arranged on the top of loading pressure plate;The piston rod end of loading hydraulic cylinder is connected with loading pressure plate by pressure sensor;Operation box bottom is equipped with the discharge hole that passes through the lower surface of workbench and is communicated with collection tank;Feeding device includes rotating shaft arranged on the front side of operation box along left-right direction.The utility model can realize the continuous automation splitting strength test test of the several test pieces of single batch of core drilling sampling concrete test piece, effectively improve test efficiency, reduce test difficulty, improve test precision, and reduce artificial labor, avoid the error caused by manual operation.

Description

Technical Field

[0001] This utility model belongs to the field of concrete quality testing technology, specifically relating to a concrete splitting strength testing device. Background Technology

[0002] During the construction and acceptance of airport runways and highway projects, concrete strength testing is required. The core sampling method for testing the splitting tensile strength of concrete is based on obtaining cylindrical samples from the structural entity using specialized core drilling equipment, and then determining their splitting tensile strength under laboratory conditions. This method directly reflects the actual performance of the structural concrete and is widely recognized as one of the most accurate on-site testing methods.

[0003] When performing splitting tensile strength tests on concrete specimens obtained from core drilling, a clamp is used to mount the specimen on the worktable of a press. The press applies a tensile load at a rate of 3000 N / s until the specimen fails, and the failure load is recorded. The splitting tensile strength is calculated using the formula: Ra = 2P / (πdL), where Ra is the splitting tensile strength, P is the failure load, d is the specimen diameter, and L is the specimen length. The calculation result can be converted into flexural strength using an empirical formula, which serves as the final criterion for project acceptance.

[0004] Most existing splitting tensile strength testing devices require manual adjustment of the specimen's position, which is labor-intensive, inefficient, and prone to errors due to improper operation, thus affecting the reliability of the test results. Furthermore, existing devices have low levels of automation and cannot perform continuous testing of multiple specimens in a single batch. Utility Model Content

[0005] This utility model discloses a concrete splitting strength testing device, which aims to solve the defects of the prior art mentioned in the background section, and to provide a device with a high degree of automation, accurate and reliable test results, and the ability to continuously test multiple specimens in a single batch.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A concrete splitting strength testing device includes a workbench, an operation box, a control box, a feeding device, a collection box, and a cleaning device. The bottom of the workbench is provided with support legs, and the collection box is provided inside the support legs. The top of the workbench is provided with an operation box and a control box connected to each other from left to right. The control box is equipped with a specimen positioning mechanism and a support plate for supporting the top of the specimen. A loading pressure plate is provided above the support plate, and a loading hydraulic cylinder is provided vertically at the top of the loading pressure plate. The piston rod end of the loading hydraulic cylinder is connected to the loading plate through a pressure sensor; the bottom of the control box is provided with a discharge hole that passes through the lower surface of the workbench and communicates with the collection box; the control box is equipped with a controller. The feeding device includes a rotating shaft located on the front side of the operating box along the left-right direction. A regular polygonal prism mounting base is coaxially provided on the outer wall of the rotating shaft. Each side of the regular polygonal prism is provided with a feeding positioning unit. The feeding positioning unit works in conjunction with the support plate and is used to transport the cylindrical specimen to the set position of the operating box. Multiple feeding positioning units constitute a continuous feeding mechanism for multiple specimens included in a single batch of testing. The inner wall of the control box is equipped with multiple cameras for observing the appearance of the specimen under pressure. The control box is also equipped with a cleaning device for cleaning the concrete debris on the top of the support plate after the splitting experiment. The cameras, pressure sensors, control circuits of the loading hydraulic cylinder, and feeding device are electrically connected to the controller.

[0007] Preferably, the support plate is fixedly connected to the top of the workbench in the left-right direction, and the top section of the support plate is arc-shaped to abut against the bottom edge of the specimen. Guide plates are provided on the front and rear sides of the support plate respectively. The two ends of the guide plate on the side away from the support plate are rotatably connected to the left and right side walls of the operating box via short shafts, and the two ends on the side closer to the support plate are connected to the inner wall of the operating box via angle adjustment hydraulic cylinders. The two ends of the angle adjustment hydraulic cylinders are rotatably connected to the end of one side of the guide plate and the inner wall of the operating box. The lower surface of the guide plate is provided with an inclination sensor. The inclination sensor and the control circuit of the angle adjustment hydraulic cylinder are electrically connected to the controller. The adjustment range of the guide plate angle by the angle adjustment hydraulic cylinder is: the maximum angle adjusts the guide plate to be horizontal, and the minimum angle adjusts the upper surface of the guide plate to be aligned with the outer edge of the discharge hole.

[0008] Preferably, the specimen positioning mechanism includes a positioning hydraulic cylinder arranged vertically on the front and rear sides of the loading hydraulic cylinder, and a positioning plate is connected to the piston rod end of the positioning hydraulic cylinder. The positioning plate penetrates the top wall of the operating box vertically and is used to constrain the position of the front and rear side edges of the specimen. The control circuit of the positioning hydraulic cylinder is electrically connected to the controller; the operating box and the control box are provided with a reaction plate arranged in the left and right direction above them, and the two ends of the reaction plate are fixedly connected to the side walls of the operating box and the control box respectively through an integrally connected plate body; the tops of the loading hydraulic cylinder and the positioning hydraulic cylinder are fixedly connected to the lower end of the reaction plate respectively.

[0009] Preferably, the outer wall of the operation box on the side away from the control box protrudes from the front face of the control box, and guide rods are respectively provided at the upper and lower ends of the protruding part. One end of the guide rod is fixedly connected to the protruding part, and the other end extends laterally to one side of the control box and is fixedly connected to the front face of the control box. The front end of the control box is equipped with a sliding door. Two guide rods pass through the left and right ends of the sliding door and are slidably connected to the sliding door. A lead screw is provided horizontally on the top of the control box and the top of the control box. The two ends of the lead screw are rotatably connected to the top of the control box and the top of the control box through mounting plates. One of the mounting plates is equipped with a drive motor, and the output shaft of the drive motor is fixedly connected to one end of the lead screw. A movable seat is screwed onto the lead screw. The bottom end of the movable seat is slidably connected to the top of the operation box and the control box. The outer end of the movable seat is connected to the top of the sliding door through an integrally formed connector. The sliding door is opened and closed by the rotation of the drive motor. The drive motor is electrically connected to the controller through wires.

[0010] Preferably, the cleaning device includes a total pressure gas pipe disposed inside the operation box in a left-right direction and located above the rear side of the support plate; The rear end of the total pressure gas pipe is connected to the pressure air supply device through an air inlet pipe, and the air inlet pipe passes through the rear wall of the control box and is fixedly connected to the rear wall. The pressure air supply device is electrically connected to the controller via a wire. Several nozzles are evenly distributed along the axis on the outer wall of the total pressure gas pipe. The nozzles are aimed at the top of the support plate and used to blow away the concrete debris after the cracking test.

[0011] Preferably, the feeding and positioning unit includes a movable plate and a fixed plate arranged opposite to each other on the side of the regular polygonal prism. Both the movable plate and the fixed plate are arranged in a direction perpendicular to the side of the regular polygonal prism. The movable plate is provided with a clamping component for adjusting the axial position of the specimen. The movable plate moves away from or towards the side of the regular polyprism via an electric cylinder, and moves the specimen via a clamping assembly. A support block with an arc-shaped positioning groove on its top surface is provided between the movable plate and the fixed plate to overlap the specimen. The bottom of the fixed plate and the bottom of the support block are fixedly connected to the outer surface of the regular polyprism. The rear end of the movable plate is provided with multiple guide rods, which are inserted into the regular polyprism and slide in cooperation with it. The control circuit of the electric cylinder is electrically connected to the controller. The movable plate is equipped with electric cylinders on its left and right sides in a direction perpendicular to the side of the regular polygonal prism. The cylinder barrel of the electric cylinder is embedded in the regular polygonal prism. The piston rod of the electric cylinder is fixedly connected to the top of the left or right end of the movable plate through a connecting block. The clamping assembly includes a double-headed hydraulic cylinder, which is arranged laterally on the outer surface of the movable plate. The two piston rod ends of the double-headed hydraulic cylinder are respectively connected to clamping sleeves. The movable plate below the piston rod of the double-headed hydraulic cylinder is provided with a through groove arranged in the left and right direction. The piston rod of the double-headed hydraulic cylinder is connected to the clamping sleeve through a connecting rod. The connecting rod passes through the through groove and slides with the through groove. The clamping sleeve is located between the movable plate and the fixed plate. Preferably, the length of the support block is less than the length of the specimen. The clamping sleeve includes a clamping plate for abutting against the left or right end of the specimen. The inner edge of the clamping plate is provided with an arc-shaped plate for constraining the side wall of the specimen. After the clamping sleeve clamps both ends of the specimen, the specimen is prevented from falling off under the constraint of the arc-shaped plate. The two piston rods of the double-headed hydraulic cylinder are connected to the connecting rod through a tension sensor. The control circuit of the double-headed hydraulic cylinder and the tension sensor are electrically connected to the controller through wires.

[0012] Preferably, the front end of the guide plate located on the front side is provided with a plug-in groove, the top of the fixed plate is provided with a mounting groove, a plug-in block is slidably fitted in the mounting groove, and sliding rods are provided on the left and right sides of the mounting groove respectively. The slide rod is inserted into the plug-in block and slides in cooperation with the plug-in block. A compression spring is provided between the plug-in block and the bottom of the mounting groove and on the outer sleeve of the slide rod. The two ends of the compression spring are fixedly connected to the plug-in block and the bottom of the mounting groove, respectively. An electromagnet is provided at the bottom of the mounting groove between the two slide rods. The electromagnet is used in cooperation with the plug-in block. The electromagnet is electrically connected to the controller through a wire.

[0013] Preferably, the two ends of the rotating shaft are rotatably connected to the upper surface of the worktable via fixed seats, and a rotating motor is provided on the outer surface of one of the fixed seats. The output shaft of the rotating motor is fixedly connected to the end of the rotating shaft. An angle sensor II is installed on the side of the regular polygonal prism. The rotating motor and the angle sensor II are electrically connected to the controller via wires.

[0014] The beneficial effects of this concrete splitting strength testing device are as follows: This invention enables continuous automated splitting tensile strength testing of multiple concrete specimens from a single batch obtained through core drilling. This effectively improves testing efficiency, reduces testing difficulty, enhances testing accuracy, reduces manual labor, and avoids errors caused by manual operation. Attached Figure Description

[0015] Figure 1 A front view structural diagram of this utility model.

[0016] Figure 2 A front view of the present invention after removing the feeding device.

[0017] Figure 3 This utility model is based on Figure 2 A front view of the sliding door after it is opened.

[0018] Figure 4 This utility model is based on Figure 3 Schematic diagram of the cross-sectional structure along the BB direction.

[0019] Figure 5 This utility model is based on Figure 4 A side sectional view of the structure in conjunction with the feeding device (only one clamping component is shown).

[0020] Figure 6 Top view of the top of the operation box and control box of this utility model.

[0021] Figure 7 A partial structural diagram of part A of this utility model.

[0022] Figure 8 A schematic diagram of the cleaning device of this utility model.

[0023] Figure 9 The structural principle diagram of the movable plate of this utility model is provided with a guide rod.

[0024] Figure 10 A cross-sectional view of the clamping sleeve and the test piece of this utility model.

[0025] 1. Workbench; 2. Collection box; 3. Reaction plate; 4. Fixed seat; 5. Rotating shaft; 6. Mounting seat; 7. Protruding part; 71. Control box; 72. Operation box; 73. Mounting plate; 74. Drive motor; 75. Moving seat; 8. Positioning hydraulic cylinder; 9. Embedded display; 10. Guide plate; 101. Insertion slot; 102. Angle adjustment hydraulic cylinder; 103. Bearing shaft; 11. Positioning plate; 111. Stiffening plate; 12. Loading hydraulic cylinder; 121. Adding... 122. Pressure plate; 13. Pressure sensor; 14. Specimen; 15. Support plate; 16. Discharge hole; 17. Support block; 18. Electric cylinder; 19. Clamping sleeve; 20. Positioning assembly; 21. Connecting block; 22. Connecting rod; 23. Air inlet pipe; 24. Total pressure gas pipe; 25. Nozzle; 26. Movable plate; 27. Double-headed hydraulic cylinder; 28. Through slot; 29. ​​Insertion block; 20. Electromagnet; 20. Slide rod; 20. Compression spring; 21. Fixing plate. Detailed Implementation

[0026] The following description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

[0027] The following embodiments can be understood as representing a part of the local structure of this utility model, or as a combination of embodiments explaining the broader structural connotation of this utility model.

[0028] Example 1: A concrete splitting strength testing device, such as Figure 1-8As shown, it includes a workbench 1, an operation box 72, a control box 71, a feeding device, a collection box 2, and a cleaning device. The bottom of the workbench 1 is provided with support legs, and the collection box 2 is provided on the inner side of the support legs. The top of the workbench 1 is provided with the operation box 72 and the control box 71 connected to each other from left to right.

[0029] The operating box 72 is equipped with a specimen positioning mechanism and a support plate 14 for supporting the top of the specimen. A loading pressure plate 121 is provided above the support plate 14. A loading hydraulic cylinder 12 is provided vertically at the top of the loading pressure plate. The piston rod end of the loading hydraulic cylinder 12 is connected to the loading pressure plate 121 through a pressure sensor 122. The bottom of the operating box 72 is provided with a discharge hole 15 that passes through the lower surface of the workbench 1 and communicates with the collection box 2. The control box 71 is equipped with a controller (and also includes a power supply, hydraulic station, air compressor and other equipment). The feeding device includes a rotating shaft 5 located on the front side of the operating box 72 in the left-right direction. A regular polygonal prism mounting seat 6 is coaxially provided on the outer wall of the rotating shaft 5. Each side of the regular polygonal prism is provided with a feeding positioning unit, which is used to provide specimens into the operating box and to position the specimens axially.

[0030] Finally, the feeding and positioning unit works in conjunction with the support plate 14 to transport the cylindrical specimen to the set position in the operating box. Multiple feeding and positioning units constitute a continuous feeding mechanism for multiple specimens included in a single batch of testing. Taking a single batch of testing that requires 3 specimens as an example, the regular polygonal prism is a regular triangular prism, and each side of the regular triangular prism can be used to position one specimen for core sampling. In practical applications, regular polygonal prisms with more sides can be set to facilitate situations where there are many test specimens.

[0031] After all the test specimens are installed, they can be automatically transported into the control box during automated operation. The inner wall of the control box 72 is equipped with multiple cameras to observe the appearance of the test specimens under pressure. When a splitting crack appears, it means that the test specimen has reached the degree of splitting, and the relevant pressure data is recorded. The visual standard for this splitting can be determined according to the specific test conditions. For example, the appearance of an apparent crack of a certain width represents splitting, or the test specimen directly breaks into pieces as splitting. Regardless of the standard, it should be consistent to facilitate the comparison of the splitting strength of different batches of test specimens.

[0032] Typically, after each specimen in a single batch has been tested, its splitting strength is calculated as an average value. The control box is also equipped with a cleaning device for cleaning the concrete debris on the top of the support plate after the splitting test. After cleaning, the next specimen can be tested. The camera, pressure sensor, control circuit of the loading hydraulic cylinder, and feeding device are electrically connected to the controller.

[0033] Example 2: like Figure 1-4As shown, the support plate 14 is fixedly connected to the top of the workbench 1 in the left-right direction. The top section of the support plate 14 is arc-shaped to abut against the bottom edge of the specimen 13. The specimen is mounted on the top of the support plate in the left-right direction. Guide plates 10 are provided on the front and rear sides of the support plate 14. The two ends of the guide plate 10 on the side away from the support plate 14 are rotatably connected to the left and right side walls of the operating box 72 through short shafts. The two ends on the side closer to the support plate 14 are connected to the inner wall of the operating box 72 through angle adjustment hydraulic cylinders 102. The two ends of the angle adjustment hydraulic cylinders 102 are rotatably connected to the end of one side of the guide plate 10 and the inner wall of the operating box 72.

[0034] A tilt sensor (not shown in the figure) is provided on the lower surface of the guide plate 10. The control circuits of the tilt sensor and the angle adjustment hydraulic cylinder 102 are electrically connected to the controller. The adjustment range of the angle of the guide plate 10 by the angle adjustment hydraulic cylinder is: the maximum angle adjusts the guide plate 10 to a horizontal position (e.g., ...). Figure 4 As shown, the upper surface of the guide plate 10 is adjusted to be aligned with the outer edge of the discharge hole 15 at the minimum angle, that is, the guide plate is rotated downwards, which forms a chute for the concrete debris after fracturing to slide into the discharge hole 15. The concrete debris enters the collection box 2 through the chute.

[0035] like Figure 1-6 As shown, the specimen positioning mechanism includes a positioning hydraulic cylinder 8 located vertically on the front and rear sides of the loading hydraulic cylinder 12. The piston rod end of the positioning hydraulic cylinder 8 is connected to a positioning plate 11. The positioning plate 11 penetrates the top wall of the operating box 72 vertically and is used to constrain the position of the front and rear side edges of the specimen 13. The control circuit of the positioning hydraulic cylinder 8 is electrically connected to the controller.

[0036] like Figure 1-6 As shown, a reaction plate 3 is provided above the operation box 72 and control box 71, arranged in a left-right direction. The two ends of the reaction plate 3 are fixedly connected to the side walls of the operation box 72 and control box 71 respectively through integrally connected plates. The tops of the loading hydraulic cylinder 12 and positioning hydraulic cylinder 8 are fixedly connected to the lower end of the reaction plate 3 respectively. Among them, the positioning hydraulic cylinder is used to position the front and rear edge lines of the specimen to prevent the specimen from shifting forward and backward. In order to ensure the strength of the positioning plate, several stiffening plates 111 are integrally connected to the outer surface of the positioning plate.

[0037] Example 3: like Figure 1 , 6 As shown, the outer wall of the operation box 72 on the side away from the control box 71 protrudes from the front end face of the control box 71. Guide rods (not marked in the figure) are respectively provided at the upper and lower ends of the protruding part 7. One end of the guide rod is fixedly connected to the protruding part 7, and the other end extends laterally to one side of the control box 71 and is fixedly connected to the front end of the control box 71.

[0038] The control box 72 is equipped with a sliding door at its front end (e.g. Figure 6 As shown in the figure (not marked), two guide rods pass through the left and right ends of the sliding door and are slidably connected to the sliding door. A lead screw is provided horizontally at the top of the operation box 72 and the control box 71. The two ends of the lead screw are rotatably connected to the top of the operation box 72 and the top of the control box 71 through the mounting plate 73. A drive motor 74 is provided outside one of the mounting plates. The output shaft of the drive motor 74 is fixedly connected to one end of the lead screw. A movable seat 75 is screwed onto the lead screw. The bottom end of the movable seat 75 is slidably connected to the top of the operation box 72 and the control box 71. The outer end of the movable seat 75 is connected to the top of the sliding door through an integrally formed connector. The rotation of the drive motor drives the movable seat to move back and forth, thereby driving the sliding door to open and close. The drive motor is electrically connected to the controller through wires.

[0039] Example 4: like Figure 4 , 5 As shown in Figure 8, the cleaning device includes a total pressure gas pipe 23 located inside the operating box 72 along the left-right direction and above the rear side of the support plate 14. The rear end of the total pressure gas pipe 23 is connected to the pressure air supply device through an air inlet pipe 22. The air inlet pipe passes through the rear wall of the operating box 72 and is fixedly connected to the rear wall. The pressure air supply device (not shown in the figure) is electrically connected to the controller through a wire. Several nozzles 24 are evenly distributed along the axis on the outer wall of the total pressure gas pipe 23. The nozzles 24 are aimed at the top of the support plate 14 and used to blow away the concrete debris after the cracking test.

[0040] Example 5: like Figure 1-7 As shown, the feeding and positioning unit includes a movable plate 25 and a fixed plate 29 arranged opposite each other on the side of the regular polygonal prism. Both the movable plate 25 and the fixed plate 29 are arranged in a direction perpendicular to the side of the regular polygonal prism. The movable plate 25 is provided with a clamping component for adjusting the axial position of the specimen 13.

[0041] The movable plate 25 moves away from or towards the side of the regular polygonal prism via an electric cylinder 17, and moves the specimen 13 via a clamping assembly. A support block 16 with a circular arc-shaped positioning groove on its top surface is provided between the movable plate 25 and the fixed plate 29 to overlap the specimen 13. The bottom of the fixed plate 29 and the bottom of the support block 16 are respectively fixedly connected to the outer surface of the regular polygonal prism. Figure 9 As shown, the rear end of the movable plate 25 is provided with multiple guide rods, which are inserted into the regular polyhedron 6 and slide in cooperation with the regular polyhedron. The control circuit of the electric cylinder 17 is electrically connected to the controller.

[0042] like Figure 7As shown, the movable plate 25 is provided with electric cylinders 17 on its left and right sides along the direction perpendicular to the side of the regular polygonal prism. The cylinder of the electric cylinder 17 is embedded in the regular polygonal prism. The piston rod of the electric cylinder 17 is fixedly connected to the top of the left or right end of the movable plate 25 through a connecting block. When the electric cylinder extends or retracts, it can drive the movable plate to extend or retract. The clamping assembly includes a double-headed hydraulic cylinder 26. The double-headed hydraulic cylinder 26 is arranged laterally on the outer surface of the movable plate 25. The two piston rod ends of the double-headed hydraulic cylinder 26 are respectively connected to clamping sleeves 18.

[0043] The movable plate below the piston rod of the double-headed hydraulic cylinder 25 is provided with a through groove 27 arranged in the left-right direction. The piston rod of the double-headed hydraulic cylinder 25 is connected to the clamping sleeve 18 through a connecting rod 21. The connecting rod passes through the through groove 27 and slides in cooperation with the through groove. The clamping sleeve is located between the movable plate and the fixed plate.

[0044] like Figure 7 , 10 As shown, the length of the support block 16 is less than the length of the specimen 13. The clamping sleeve 18 includes a clamping plate for abutting against the left or right end of the specimen 13. The inner edge of the clamping plate is provided with an arc-shaped plate for constraining the sidewall of the specimen. Figure 10 As shown, after the clamping sleeve clamps both ends of the specimen 13, the specimen is prevented from falling off under the constraint of the arc plate. The two piston rods of the double-headed hydraulic cylinder 26 are connected to the connecting rod through a tension sensor (not marked in the figure).

[0045] The control circuit and tension sensor of the dual-head hydraulic cylinder 26 are electrically connected to the controller via wires. When the specimen rests on top of the support block, both ends of the specimen extend beyond the left and right ends of the support block. At this time, the dual-head hydraulic cylinder contracts to a certain extent under the control of the controller. The clamping sleeve, which is first fastened to the end of the specimen, moves the specimen to the other side until the clamping sleeve on the other side fastens to the other end of the specimen. At this time, the specimen is positioned axially and is firmly fixed on the clamping assembly. To avoid excessive friction between the specimen and the arc-shaped positioning groove on the top of the support block, the inner wall of the arc-shaped positioning groove can be polished and a graphene lubricating layer can be applied. The radius of the arc-shaped positioning groove should be larger than the radius of the specimen so that the bottom edge of the specimen can contact the bottom edge of the arc-shaped positioning groove. Due to the gravity of the specimen itself, the specimen naturally stays in the set position of the arc-shaped positioning groove, thus ensuring that the clamping assembly can clamp it smoothly.

[0046] Example 6: like Figure 3 , 7As shown, the front guide plate 10 is provided with a plug-in groove 101, the top of the fixed plate 29 is provided with a mounting groove, a plug-in block 28 is slidably fitted in the mounting groove, and a sliding rod 282 is provided on the left and right sides of the mounting groove. The sliding rod 282 is inserted into the plug-in block 28 and slidably fitted with the plug-in block 28. A compression spring 283 is provided between the plug-in block 28 and the bottom of the mounting groove and on the outer sleeve of the sliding rod. The two ends of the compression spring 283 are fixedly connected to the plug-in block and the bottom of the mounting groove, respectively. An electromagnet 281 is provided at the bottom of the mounting groove between the two sliding rods 282.

[0047] The electromagnet 281 is used in conjunction with the plug-in block 28, and the electromagnet is electrically connected to the controller via a wire. When the front guide plate is adjusted to be horizontal, the plug-in block aligns with the plug-in slot, the electromagnet is de-energized, and the plug-in block is pushed into the plug-in slot under the elastic force of the compression spring, thereby fixing the fixing plate and the guide plate, and ensuring the stability of the trajectory when the electric cylinder transports the test piece.

[0048] Example 7: like Figure 1 As shown, the two ends of the rotating shaft 5 are rotatably connected to the upper surface of the worktable 1 through the fixed base 4. One of the fixed bases 4 has a rotating motor (not marked in the figure) on its outer surface. The output shaft of the rotating motor is fixedly connected to the end of the rotating shaft 5. The rotating shaft drives the regular polyprism to rotate. The side of the regular polyprism is equipped with an angle sensor 2 to determine whether each side of the regular polyprism has reached the position of being horizontal on the upper side. The rotating motor and the angle sensor 2 are electrically connected to the controller through wires.

[0049] Example 8: Based on Examples 1-7, this embodiment discloses the following instructions for using a continuous automated test of a concrete splitting strength testing device: Step 1: Sequentially load the specimens into each feeding and positioning unit. Specifically: Rotate the motor until one side of the regular polyhedron is horizontal and at its highest point. Under the control of the controller, stop the motor, and the operator places the specimen on top of the support block in the feeding and positioning unit on the top surface of the regular polyhedron. At this time, both ends of the specimen are suspended in the air. Activate the controller button, the double-headed hydraulic cylinder retracts, and the two clamping sleeves clamp the two ends of the specimen, adjusting it to the set ready position. In this way, install the specimens in each feeding and positioning unit sequentially. Step 2: Press the controller button to start the operation program. The sliding door is moved to the side of the control box by the drive motor, and the front port of the control box is opened. Step 3: After the controller controls the rotating shaft to rotate to a certain angle, the fixed plate aligns with the front guide plate that has been adjusted to be horizontal. The electromagnet is de-energized, the plug block is inserted into the plug slot, and the front guide plate is connected to the corresponding fixed plate as one unit. Step 4: The electric cylinder actuates, moving the specimen clamped by the clamping assembly into the operating box until the specimen moves to the top of the support plate and the top edge of the support plate is aligned with the bottom edge of the specimen. At this point, the axial position (Y-axis) and the front-back position (X-axis) of the specimen are precisely positioned. In this state, the positioning hydraulic cylinders on the front and back sides actuate, moving the positioning plate down a certain distance and tightly fitting it against the front and rear edge lines of the specimen.

[0050] Afterwards, the double-headed hydraulic cylinder extends, and the two clamping sleeves disengage from the end of the specimen; the electric cylinder retracts, bringing the movable plate back to its initial position; the electromagnet is energized, attracting the plug block to overcome the compression spring force and return to its initial position; this process can also be replaced by: the rear positioning hydraulic cylinder actuates, causing the rear positioning plate to move downwards to the set position, and then the electric cylinder is activated to transport the specimen into the operating box, so that the bottom edge of the specimen abuts against the top of the support plate, and the rear edge of the specimen abuts against the rear positioning plate, and then the front positioning plate moves down to the set position and abuts against the front edge of the specimen, and then the electric cylinder retracts and the electromagnet is energized; Step 5: The controller closes the sliding door, starts the loading hydraulic cylinder, and gradually and evenly applies the load to the specimen. Based on the data from the pressure sensor and the visual information observed by the camera, the pressure value when the specimen reaches the set damage condition is recorded, such as the pressure value when a crack of a certain width appears. When the rated maximum pressure is reached, the test is stopped, and the guide plate, which is adjusted to be level on the front and back sides, is adjusted to the minimum angle. After the test, the specimen debris or the whole specimen enters the collection box through the guide plate and the discharge hole. Step 6: The controller opens the sliding door and controls the rotating motor to continue rotating. Repeat steps 3-5 until all specimens have completed the splitting test. Step 7: The controller comprehensively evaluates the splitting strength of a single batch of specimens based on the recorded data, calculates the splitting strength of each specimen, and takes the average value.

Claims

1. A concrete splitting strength testing device, characterized in that: it includes a workbench, an operation box, a control box, a feeding device, a collection box, and a cleaning device; the bottom of the workbench is provided with support legs, the inside of the support legs is provided with a collection box, and the top of the workbench is provided with an operation box and a control box connected to each other from left to right. The control box is equipped with a specimen positioning mechanism and a support plate for supporting the top of the specimen. A loading pressure plate is provided above the support plate, and a loading hydraulic cylinder is provided vertically at the top of the loading pressure plate. The piston rod end of the loading hydraulic cylinder is connected to the loading plate through a pressure sensor; the bottom of the control box is provided with a discharge hole that passes through the lower surface of the workbench and communicates with the collection box; the control box is equipped with a controller. The feeding device includes a rotating shaft located on the front side of the operating box along the left-right direction. A regular polygonal prism mounting base is coaxially provided on the outer wall of the rotating shaft. Each side of the regular polygonal prism is provided with a feeding positioning unit. The feeding positioning unit works in conjunction with the support plate and is used to transport the cylindrical specimen to the set position of the operating box. Multiple feeding positioning units constitute a continuous feeding mechanism for multiple specimens included in a single batch of testing. The inner wall of the control box is equipped with multiple cameras for observing the appearance of the specimen under pressure. The control box is also equipped with a cleaning device for cleaning the concrete debris on the top of the support plate after the splitting experiment. The cameras, pressure sensors, control circuits of the loading hydraulic cylinder, and feeding device are electrically connected to the controller.

2. The concrete splitting strength testing device as described in claim 1, characterized in that: The support plate is fixedly connected to the top of the workbench in the left-right direction. The top of the support plate has a circular arc shape to abut against the bottom edge of the specimen. Guide plates are provided on the front and rear sides of the support plate. The two ends of the guide plate on the side away from the support plate are rotatably connected to the left and right side walls of the operating box via short shafts, and the two ends on the side closer to the support plate are connected to the inner wall of the operating box via angle adjustment hydraulic cylinders. The two ends of the angle adjustment hydraulic cylinders are rotatably connected to the end of one side of the guide plate and the inner wall of the operating box. The lower surface of the guide plate is provided with an inclination sensor. The inclination sensor and the control circuit of the angle adjustment hydraulic cylinder are electrically connected to the controller. The adjustment range of the guide plate angle by the angle adjustment hydraulic cylinder is: the maximum angle adjusts the guide plate to be horizontal, and the minimum angle adjusts the upper surface of the guide plate to be aligned with the outer edge of the discharge hole.

3. The concrete splitting strength testing device as described in claim 2, characterized in that: The specimen positioning mechanism includes a positioning hydraulic cylinder located vertically on the front and rear sides of the loading hydraulic cylinder. The piston rod end of the positioning hydraulic cylinder is connected to a positioning plate, which penetrates the top wall of the operating box vertically and is used to constrain the position of the front and rear side edges of the specimen. The control circuit of the positioning hydraulic cylinder is electrically connected to the controller; the operating box and the control box are provided with a reaction plate arranged in the left and right direction above them, and the two ends of the reaction plate are fixedly connected to the side walls of the operating box and the control box respectively through an integrally connected plate body; the tops of the loading hydraulic cylinder and the positioning hydraulic cylinder are fixedly connected to the lower end of the reaction plate respectively.

4. The concrete splitting strength testing device as described in claim 3, characterized in that: The outer wall of the operation box on the side away from the control box protrudes from the front face of the control box. Guide rods are provided at the upper and lower ends of the protruding part. One end of the guide rod is fixedly connected to the protruding part, and the other end extends laterally to one side of the control box and is fixedly connected to the front face of the control box. The front end of the control box is equipped with a sliding door. Two guide rods pass through the left and right ends of the sliding door and are slidably connected to the sliding door. A lead screw is provided horizontally on the top of the control box and the top of the control box. The two ends of the lead screw are rotatably connected to the top of the control box and the top of the control box through mounting plates. One of the mounting plates is equipped with a drive motor, and the output shaft of the drive motor is fixedly connected to one end of the lead screw. A movable seat is screwed onto the lead screw. The bottom end of the movable seat is slidably connected to the top of the operation box and the control box. The outer end of the movable seat is connected to the top of the sliding door through an integrally formed connector. The sliding door is opened and closed by the rotation of the drive motor. The drive motor is electrically connected to the controller through wires.

5. The concrete splitting strength testing device as described in claim 4, characterized in that: the cleaning device includes a total pressure gas pipe disposed inside the operating box along the left-right direction and located above the rear side of the support plate; The rear end of the total pressure gas pipe is connected to the pressure air supply device through an air inlet pipe, and the air inlet pipe passes through the rear wall of the control box and is fixedly connected to the rear wall. The pressure air supply device is electrically connected to the controller via a wire. Several nozzles are evenly distributed along the axis on the outer wall of the total pressure gas pipe. The nozzles are aimed at the top of the support plate and used to blow away the concrete debris after the cracking test.

6. The concrete splitting strength testing device as described in claim 5, characterized in that: The feeding and positioning unit includes a movable plate and a fixed plate arranged opposite each other on the side of the regular polyprism. Both the movable plate and the fixed plate are arranged in a direction perpendicular to the side of the regular polyprism. The movable plate is provided with a clamping component for adjusting the axial position of the specimen. The movable plate moves away from or towards the side of the regular polyprism via an electric cylinder, and moves the specimen via a clamping assembly. A support block with an arc-shaped positioning groove on its top surface is provided between the movable plate and the fixed plate to overlap the specimen. The bottom of the fixed plate and the bottom of the support block are fixedly connected to the outer surface of the regular polyprism. The rear end of the movable plate is provided with multiple guide rods, which are inserted into the regular polyprism and slide in cooperation with it. The control circuit of the electric cylinder is electrically connected to the controller. The movable plate is equipped with electric cylinders on its left and right sides in a direction perpendicular to the side of the regular polygonal prism. The cylinder barrels of the electric cylinders are embedded in the regular polygonal prisms. The piston rods of the electric cylinders are fixedly connected to the top of the left or right end of the movable plate through connecting blocks. The clamping assembly includes a double-headed hydraulic cylinder, which is arranged laterally on the outer surface of the movable plate. The two piston rod ends of the double-headed hydraulic cylinder are respectively connected to clamping sleeves. The movable plate below the piston rods of the double-headed hydraulic cylinders is provided with through grooves arranged in the left and right directions. The piston rods of the double-headed hydraulic cylinders are connected to the clamping sleeves through connecting rods. The connecting rods pass through the through grooves and slide in cooperation with the through grooves. The clamping sleeves are located between the movable plate and the fixed plate.

7. The concrete splitting strength testing device as described in claim 6, characterized in that: The length of the support block is less than the length of the specimen. The clamping sleeve includes a clamping plate for abutting against the left or right end of the specimen. The inner edge of the clamping plate is provided with an arc-shaped plate for constraining the side wall of the specimen. After the clamping sleeve clamps the two ends of the specimen, the specimen is prevented from falling off under the constraint of the arc-shaped plate. The two piston rods of the double-headed hydraulic cylinder are connected to the connecting rod through a tension sensor. The control circuit of the double-headed hydraulic cylinder and the tension sensor are electrically connected to the controller through wires.

8. The concrete splitting strength testing device as described in claim 7, characterized in that: the front end of the guide plate located on the front side is provided with an insertion groove, the top end of the fixed plate is provided with an installation groove, an insertion block is slidably fitted in the installation groove, and sliding rods are respectively provided on the left and right sides of the installation groove. The slide rod is inserted into the plug-in block and slides in cooperation with the plug-in block. A compression spring is provided between the plug-in block and the bottom of the mounting groove and on the outer sleeve of the slide rod. The two ends of the compression spring are fixedly connected to the plug-in block and the bottom of the mounting groove, respectively. An electromagnet is provided at the bottom of the mounting groove between the two slide rods. The electromagnet is used in cooperation with the plug-in block. The electromagnet is electrically connected to the controller through a wire.

9. The concrete splitting strength testing device as described in claim 1, characterized in that: The two ends of the rotating shaft are rotatably connected to the upper surface of the workbench via fixed seats. A rotating motor is provided on the outer surface of one of the fixed seats, and the output shaft of the rotating motor is fixedly connected to the end of the rotating shaft. An angle sensor II is installed on the side of the regular polygonal prism. The rotating motor and the angle sensor II are electrically connected to the controller via wires.

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