Clamping device for cement compression resistance detection

Abstract

The utility model discloses a clamping device for cement compression resistance detection, which relates to the technical field of clamping devices and comprises a machine body, a portal frame is arranged at the top of the machine body, and a detection component for detecting compression resistance is mounted on the portal frame. The top of the machine body is fixedly connected with a material carrying platform, and the material carrying platform is used for placing a to-be-detected cement block. According to the cement block detection device, the binding assembly and the positioning assembly are arranged to fix the cement block, so that the cement block can be fixed in two dimensions in the horizontal direction, inaccurate detection caused by deviation of the cement block in the detection process is avoided, an external air pump is used for supplying air to the first air cylinder and the second air cylinder in the positioning process, and the detection accuracy is improved. Air pressure enters a first air cylinder to push a first piston plate to move and drive a binding assembly to act to push a cement block to the middle; meanwhile, air pressure enters a second air cylinder to push a second piston plate to move and drive a pressing assembly to move in a centering mode, and the cement block is pushed to the center and clamped.

Description

Technical Field

[0001] This utility model relates to the field of clamping device technology, specifically to a clamping device for testing the compressive strength of cement. Background Technology

[0002] Cement compressive strength testing is a core testing method for evaluating the mechanical properties of hardened cement. It involves applying a vertical load to a standard cubic or cylindrical specimen using a press until failure, in order to determine its compressive strength. This test requires ensuring that the specimen is strictly centered during the compression process to avoid data deviation caused by eccentric loading.

[0003] Cement compressive strength testing is used to examine the compressive strength of cement blocks and to determine their compressive capacity. Clamping a workpiece refers to a device used during the manufacturing process to fix the workpiece in the correct position for construction or testing; it is also called a clamp. In traditional testing, the test piece needs to be fixed on the press platform by clamps, and the clamping accuracy directly affects the accuracy of the test results.

[0004] A Chinese patent (authorization announcement number CN212621862U) proposes a clamping device for cement compressive strength testing to solve the above-mentioned technical problems. The technical solution disclosed in the patent document is as follows: by rotating the base, the rotation of the base can drive the end face gear ring to rotate, the rotation of the end face gear ring can drive gear one and gear two to rotate, the rotation of gear one can drive the threaded shaft one to rotate, the rotation of threaded shaft one can drive the front clamping block to move, the rotation of gear two can drive the threaded shaft two to rotate, and the rotation of threaded shaft two can drive the rear clamping block to move.

[0005] However, the cement fixing method in this scheme is too cumbersome. It requires manual adjustment of the screws (threaded shaft one and threaded shaft two) to position the cement block in both directions. Furthermore, due to clamping requirements, the screw pitch cannot be set too large, so a long rotation time is needed to complete the clamping. In addition, when fixing the cement in both directions, the above scheme requires centering one direction first, and then centering the other direction. After centering one direction, the structure used to restrain that direction will inevitably contact both sides of the cement block. Therefore, friction will inevitably occur at the contact points during the centering and fixing of the other direction. On the one hand, this hinders the centering and clamping, and on the other hand, the friction will cause the cement block to be ground into fragments. This not only affects the detection accuracy, but also the fragments generated when the cement specimen breaks can easily enter the screw, causing thread jamming or transmission failure, which seriously affects the life of the equipment. Utility Model Content

[0006] The purpose of this invention is to provide a clamping device for testing the compressive strength of cement, so as to solve the problems of low clamping efficiency and high wear and tear of the device in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A clamping device for testing the compressive strength of cement includes a body, a gantry frame at the top of the body, and a testing component for testing compressive strength installed on the gantry frame. A material loading platform is fixedly connected to the top of the body for placing the cement block to be tested. A lifting plate is slidably connected between two columns of the gantry frame. A through groove is opened in the middle of the lifting plate, and a cylindrical column is fixedly connected inside the through groove. Four mounting blocks are fixedly connected in a ring at equal intervals on the outer side of the cylindrical column. The top of two mounting blocks is fixedly connected to a first air cylinder, and the axes of the two first air cylinders are parallel to each other. The other two mounting blocks are fixedly connected to the top of the first air cylinders. Each block has a second air cylinder fixedly connected to its top. The axes of the two second air cylinders are parallel to each other. A first air pipe is provided on the first air cylinder. A first piston plate is slidably connected between the inner walls of the first air cylinder. A restraining assembly is fixedly connected to the end face of the first piston plate. The restraining assembly is used to center and restrain the cement block in one horizontal dimension. A second piston plate is slidably connected between the inner walls of the second air cylinder. A pressing assembly is fixedly connected to the end face of the second piston plate. The pressing assembly is used to fix the cement block. A second air pipe is provided on the second air cylinder. Both the first air pipe and the second air pipe are connected to an external air pump through a reversing valve.

[0009] By adopting the above technical solution, two structures for fixing the cement block are set up: a restraint component and a positioning component. This allows the cement block to be fixed in two horizontal dimensions, thereby avoiding inaccurate detection caused by the cement block deviating during the detection process.

[0010] A further improvement of this utility model is that the diameter of the first trachea is larger than that of the second trachea.

[0011] By adopting the above technical solution, when positive pressure is provided by an external air pump, positive pressure can be provided to the first air cylinder more quickly through the first air pipe, so that the first piston plate moves faster than the second piston plate. Furthermore, the cement block is always first bound by the binding component and then pressed by the pressing component. The binding component is set to a structure that does not completely fix the cement block, ensuring that it can only be bound in one direction and can still slide in the other direction, waiting for the pressing component to fix it in the center.

[0012] A further improvement of the present invention is that the restraint assembly includes a first push rod fixedly connected to the first piston plate, the end of the first push rod away from the first piston plate extends to the outside of the first air cylinder and is fixedly connected to a roller frame, and two pressure rollers are rotatably connected between the inner sides of the roller frame.

[0013] By adopting the above technical solution, the cement block is restrained by setting a rotatable pressure roller. After being pressed from both sides, the cement block can still move in the tangential direction of the contact point between the pressure roller and the cement block. During the movement, the pressure roller is driven to rotate. Therefore, there will be no large friction or obstruction. This achieves restraint of the cement block in one direction without hindering the subsequent adjustment of the pressing components.

[0014] A further improvement of this utility model is that the outer wall of the pressure roller is rough, and the two pressure rollers are connected by a conveyor belt.

[0015] The above technical solution uses a structure similar to a conveyor belt system (without a drive), where the pressure roller and the conveyor belt work together to achieve the clamping. On the one hand, this increases the contact area with the cement block, thus avoiding damage to the cement block. On the other hand, it solves the problem that when only the pressure roller is used for clamping, the actual contact area between the pressure roller and the cement block is only a line, which leads to pressure concentration and affects the test results.

[0016] A further improvement of this utility model is that: the outer wall of the loading platform is threaded and a rotating cylinder is threadedly connected to it; the bottom of the cylinder extends to the bottom of the lifting plate and is rotatably connected to the rotating cylinder; a driven gear is fixedly connected to the outer wall of the rotating cylinder; a driving gear is rotatably connected to the bottom of the lifting plate; the driving gear and the driven gear are meshed; a spline groove is provided on the central shaft of the driving gear; a motor is fixedly connected inside the machine body; the output end of the motor extends to the top of the machine body and is fixedly connected to a spline shaft; the spline shaft and the spline groove are slidably connected; a clearance groove is provided on the top of the loading platform; a rotating roller is rotatably connected between two mounting blocks on which the first air cylinder is installed; the rotating roller passes through the clearance groove; and two rotating rollers and two clearance grooves are symmetrically arranged.

[0017] By adopting the above technical solution, the cylinder is set as a structure that can be raised and lowered, and a rotating roller is mounted on the mounting block so that the cement block can be lifted when the cylinder is raised. This allows the cement block to move on the rotating roller during the adjustment of the clamping component, thereby reducing wear and obstruction.

[0018] A further improvement of the present invention is that the pressing assembly includes a second pressing rod fixedly connected to the second piston plate, a pressing block fixedly connected to the end of the second pressing rod away from the second piston plate, and rubber pads fixedly connected to the sides of the two pressing blocks that are close to each other.

[0019] By adopting the above technical solution, the cement block can be fixed by moving the two second piston plates to one side closer to each other, thereby driving the second pressure rod and pressure block to move to one side closer to each other.

[0020] A further improvement of the present invention is that the first push rod is configured as a square rod, a limiting frame is fixedly connected between the inner walls of the first piston plate, and the first push rod passes through the limiting frame and is slidably connected to the limiting frame.

[0021] By adopting the above technical solution, the first push rod is set as a square rod and slides with the limiting frame, so that the first push rod reciprocates, thus avoiding the first piston plate and roller frame from deflecting and affecting the use.

[0022] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0023] 1. This utility model provides a clamping device for cement compressive strength testing. By setting up two structures for fixing the cement block, namely a binding component and a positioning component, the cement block can be fixed in two dimensions in the horizontal direction, thereby avoiding inaccurate testing due to cement block deviation during the testing process. During the positioning process, an external air pump supplies air to the first air cylinder and the second air cylinder. After the air pressure enters the first air cylinder, it pushes the first piston plate to move and drives the binding component to move, pushing the cement block towards the center. At the same time, after the air pressure enters the second air cylinder, it pushes the second piston plate to move and drives the clamping component to move in the center, pushing the cement block towards the center and clamping it.

[0024] 2. This utility model provides a clamping device for testing the compressive strength of cement. By setting the diameter of the first air pipe to be larger than that of the second air pipe, when positive pressure is provided by an external air pump, positive pressure can be provided to the first air cylinder more quickly through the first air pipe, so that the first piston plate moves faster than the second piston plate. Furthermore, the cement block is always first bound by the binding component and then pressed by the pressing component. The binding component is set to a structure that does not completely fix the cement block, ensuring that it can only be bound in one direction and can still slide in the other direction, waiting for the pressing component to fix it in the center. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is one of the external structural diagrams of the restraint assembly and clamping assembly of this utility model;

[0028] Figure 3 This is a cross-sectional structural diagram of the restraint assembly and clamping assembly of this utility model;

[0029] Figure 4 This is one of the external structural diagrams of the restraint assembly and clamping assembly of this utility model;

[0030] Figure 5 This is a schematic diagram of the installation structure of the material loading platform and the rotating drum of this utility model;

[0031] In the diagram: 1. Machine body; 2. Gantry frame; 3. Lifting plate; 4. Cylinder column; 5. Mounting block; 6. First air cylinder; 7. Second air cylinder; 8. First piston plate; 9. First push rod; 10. Roller frame; 11. Pressure roller; 12. Loading platform; 13. Second piston plate; 14. Second pressure rod; 15. Pressure block; 16. Rotary drum; 17. Driven gear; 18. Driven gear; 19. Motor; 20. Splined shaft; 21. Splined groove; 22. Relief groove; 23. Rotary roller; 24. First air pipe; 25. Second air pipe; 26. Limiting frame. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to embodiments:

[0033] Example 1

[0034] like Figure 1 , Figure 2 and Figure 4 As shown, this utility model provides a clamping device for testing the compressive strength of cement, including a body 1, a gantry frame 2 on the top of the body 1, and a testing component for testing compressive strength installed on the gantry frame 2; a material loading platform 12 is fixedly connected to the top of the body 1, the material loading platform 12 is used to place the cement block to be tested, a lifting plate 3 is slidably connected between the two columns of the gantry frame 2, a through groove is opened in the middle of the lifting plate 3, a cylindrical column 4 is fixedly connected inside the through groove, and four mounting blocks 5 are fixedly connected in a ring at equal intervals on the outer side of the cylindrical column 4, wherein the top of two mounting blocks 5 is fixedly connected to a first air cylinder 6, the axes of the two first air cylinders 6 are parallel to each other, and additionally... A second air cylinder 7 is fixedly connected to the top of each of the two mounting blocks 5. The axes of the two second air cylinders 7 are parallel to each other. A first air pipe 24 is provided on the first air cylinder 6. A first piston plate 8 is slidably connected between the inner walls of the first air cylinder 6. A restraining assembly is fixedly connected to the end face of the first piston plate 8. The restraining assembly is used to center and restrain the cement block in one of the horizontal dimensions. A second piston plate 13 is slidably connected between the inner walls of the second air cylinder 7. A pressing assembly is fixedly connected to the end face of the second piston plate 13. The pressing assembly is used to fix the cement block. A second air pipe 25 is provided on the second air cylinder 7. Both the first air pipe 24 and the second air pipe 25 are connected to an external air pump through a reversing valve.

[0035] In this embodiment, two structures for fixing the cement block are set up: a restraint component and a positioning component, so as to fix the cement block in two dimensions in the horizontal direction, thereby avoiding inaccurate detection caused by the cement block deviating during the detection process.

[0036] Specifically, during the positioning process, an external air pump supplies air to the first air cylinder 6 and the second air cylinder 7. After the air pressure enters the first air cylinder 6, it pushes the first piston plate 8 to move and drives the restraint assembly to move, pushing the cement block towards the center. At the same time, after the air pressure enters the second air cylinder 7, it pushes the second piston plate 13 to move and drives the clamping assembly to move towards the center, pushing the cement block towards the center and clamping it.

[0037] After the test is completed, the airflow direction is controlled by an external reversing valve, so that the air in the first air cylinder 6 and the second air cylinder 7 can be extracted by an external air pump, thereby resetting the first piston plate 8 and the second piston plate 13, and driving the restraint assembly and the clamping assembly to reset.

[0038] Preferably, the diameter of the first trachea 24 is larger than that of the second trachea 25.

[0039] In this embodiment, when positive pressure is provided by an external air pump, positive pressure can be provided to the first air cylinder 6 more quickly through the first air pipe 24, so that the first piston plate 8 moves faster than the second piston plate 13. Furthermore, the cement block is always first bound by the binding component and then pressed by the pressing component. The binding component is set to a structure that does not completely fix the cement block, ensuring that it can only be bound in one direction and can still slide in the other direction, waiting for the pressing component to fix it in the center.

[0040] like Figure 3 and Figure 4 As shown, preferably, the restraint assembly includes a first push rod 9 fixedly connected to the first piston plate 8. One end of the first push rod 9 away from the first piston plate 8 extends to the outside of the first air cylinder 6 and is fixedly connected to a roller frame 10. Two pressure rollers 11 are rotatably connected between the inner sides of the roller frame 10.

[0041] In this embodiment, the cement block is restrained by a rotatable pressure roller 11. After being pressed from both sides, the cement block can still move in the tangential direction of the contact point between the pressure roller 11 and the cement block. During the movement, the pressure roller 11 is rotated, so there will be no large friction or obstruction. This achieves restraint of the cement block in one direction without hindering the subsequent adjustment of the pressing components.

[0042] like Figure 3 and Figure 4 As shown, preferably, the outer wall of the pressure roller 11 is rough, and the two pressure rollers 11 are connected by a conveyor belt.

[0043] In this embodiment, the binding assembly is configured to resemble a conveyor belt system (without a drive), with the pressure roller 11 and the conveyor belt working together to achieve the pressing. On the one hand, this increases the contact area with the cement block, thereby avoiding damage to the cement block. On the other hand, it solves the problem that when only the pressure roller 11 is used for binding, the actual contact area between the pressure roller 11 and the cement block is only a line, which leads to pressure concentration and affects the test results.

[0044] Example 2

[0045] like Figure 2 and Figure 5 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, the outer wall of the loading platform 12 is threaded and connected to a rotating cylinder 16. The bottom of the cylinder 4 extends to the bottom of the lifting plate 3 and is rotatably connected to the rotating cylinder 16. A driven gear 17 is fixedly connected to the outer wall of the rotating cylinder 16. A driving gear 18 is rotatably connected to the bottom of the lifting plate 3. The driving gear 18 meshes with the driven gear 17. A spline groove 21 is provided on the central shaft of the driving gear 18. A motor 19 is fixedly connected inside the machine body 1. The output end of the motor 19 extends to the top of the machine body 1 and is fixedly connected to a spline shaft 20. The spline shaft 20 is slidably connected to the spline groove 21. A clearance groove 22 is provided on the top of the loading platform 12. A rotating roller 23 is rotatably connected between two mounting blocks 5 on which the first air cylinder 6 is installed. The rotating roller 23 passes through the clearance groove 22. Two rotating rollers 23 and two clearance grooves 22 are symmetrically arranged.

[0046] Although the cement block is first bound to both sides by setting up a binding component and then fixed in the center by using a clamping component, the cement block is placed directly on the loading platform 12. Since the cement block itself has a certain mass, there is a large frictional resistance between the cement block and the loading platform 12 after binding it with the binding component, and there is still a wear problem.

[0047] In this embodiment, the cylinder 4 is configured to be able to be raised and lowered, and the rotating roller 23 is mounted on the mounting block 5 so that the cement block can be lifted when the cylinder 4 is raised, so that the cement block moves on the rotating roller 23 during the adjustment of the pressing component, thereby reducing wear and obstruction.

[0048] Specifically, by controlling the operation of motor 19, the spline shaft 20 is driven to rotate, which in turn drives the drive gear 18 to rotate through spline groove 21, and then drives the driven gear 17 to rotate. Furthermore, the rotating drum 16 is driven to rotate. The rotating drum 16 is threadedly connected to the material loading platform 12, so the rotating drum 16 will move synchronously along the axial direction during its rotation. When the rotating drum 16 rises, it drives the mounting block 5 to rise, causing the binding assembly, the clamping assembly, and the rotating roller 23 to rise and lift the cement block. When the rotating drum 16 falls, the above structure is reset, and the rotating roller 23 falls into the relief groove 22, so as not to affect the subsequent inspection process.

[0049] like Figure 3 and Figure 4 As shown, preferably, the pressing assembly includes a second pressure rod 14 fixedly connected to the second piston plate 13, and a pressure block 15 fixedly connected to one end of the second pressure rod 14 away from the second piston plate 13. Rubber pads are fixedly connected to the sides of the two pressure blocks 15 that are close to each other.

[0050] In this embodiment, the cement block can be fixed by moving the two second piston plates 13 toward one side and driving the second pressure rod 14 and pressure block 15 to move toward one side.

[0051] like Figure 3 and Figure 4 As shown, preferably, the first push rod 9 is a square rod, and a limit frame 26 is fixedly connected between the inner walls of the first piston plate. The first push rod 9 passes through the limit frame 26 and is slidably connected to the limit frame 26.

[0052] In this embodiment, by setting the first push rod 9 as a square rod and sliding it with the limiting frame 26, the first push rod 9 is made to rotate back and forth, thus avoiding the first piston plate 8 and roller frame 10 from deflecting and affecting the use.

[0053] The working principle of the clamping device used for cement compressive strength testing is explained in detail below.

[0054] like Figures 1-5 As shown, during the positioning process, an external air pump supplies air to the first air cylinder 6 and the second air cylinder 7. After the air pressure enters the first air cylinder 6, it pushes the first piston plate 8 to move and drives the restraint assembly to move, pushing the cement block towards the center. At the same time, after the air pressure enters the second air cylinder 7, it pushes the second piston plate 13 to move and drives the clamping assembly to move towards the center, pushing the cement block towards the center and clamping it.

[0055] The diameter of the first air pipe 24 is larger than that of the second air pipe 25. When positive pressure is provided by an external air pump, the first air pipe 24 can provide positive pressure to the first air cylinder 6 more quickly, so that the first piston plate 8 moves faster than the second piston plate 13. Furthermore, after being pressed from both sides, the cement block can still move in the tangential direction of the contact point between the pressure roller 11 and the cement block. During the movement, the pressure roller 11 is driven to rotate, so there will be no large friction or obstruction. This achieves the binding of the cement block in one direction without hindering the adjustment of the subsequent pressing components, ensuring that it can only bind in one direction and can still slide in the other direction, waiting for the pressing components to be centered and fixed. The two second piston plates 13 move to the side that is closer to each other, and drive the second pressure rod 14 and the pressure block 15 to move to the side that is closer to each other, thus fixing the cement block.

[0056] After the test is completed, the airflow direction is controlled by an external reversing valve, so that the air in the first air cylinder 6 and the second air cylinder 7 can be extracted by an external air pump, thereby resetting the first piston plate 8 and the second piston plate 13, and driving the restraint assembly and the clamping assembly to reset.

[0057] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A clamping device for testing the compressive strength of cement, comprising a body (1), wherein a gantry frame (2) is provided on the top of the body (1), and a testing component for testing compressive strength is installed on the gantry frame (2); characterized in that: A loading platform (12) is fixedly connected to the top of the machine body (1). The loading platform (12) is used to place the cement block to be tested. A lifting plate (3) is slidably connected between the two columns of the gantry frame (2). A through groove is opened in the middle of the lifting plate (3). A cylindrical column (4) is fixedly connected inside the through groove. Four mounting blocks (5) are fixedly connected in a ring at equal intervals on the outside of the cylindrical column (4). The top of two of the mounting blocks (5) is fixedly connected to a first air cylinder (6). The axes of the two first air cylinders (6) are parallel to each other. The top of the other two mounting blocks (5) is fixedly connected to a second air cylinder (7). The axes of the two second air cylinders (7) are parallel to each other. Parallel to each other, the first air cylinder (6) is provided with a first air pipe (24), and a first piston plate (8) is slidably connected between the inner walls of the first air cylinder (6). A binding assembly is fixedly connected to the end face of the first piston plate (8). The binding assembly is used to center and bind the cement block in one of the horizontal dimensions. A second piston plate (13) is slidably connected between the inner walls of the second air cylinder (7). A pressing assembly is fixedly connected to the end face of the second piston plate (13). The pressing assembly is used to fix the cement block. A second air pipe (25) is provided on the second air cylinder (7). Both the first air pipe (24) and the second air pipe (25) are connected to an external air pump through a reversing valve.

2. The clamping device for testing the compressive strength of cement according to claim 1, characterized in that: The diameter of the first trachea (24) is larger than that of the second trachea (25).

3. The clamping device for testing the compressive strength of cement according to claim 2, characterized in that: The restraint assembly includes a first push rod (9) fixedly connected to the first piston plate (8), the end of the first push rod (9) away from the first piston plate (8) extending to the outside of the first air cylinder (6) and fixedly connected to a roller frame (10), and two pressure rollers (11) rotatably connected between the inner sides of the roller frame (10).

4. The clamping device for testing the compressive strength of cement according to claim 3, characterized in that: The outer wall of the pressure roller (11) is rough, and the two pressure rollers (11) are connected by a conveyor belt.

5. The clamping device for testing the compressive strength of cement according to claim 4, characterized in that: The outer wall of the loading platform (12) is threaded and connected to a rotating drum (16). The bottom of the cylinder (4) extends to the bottom of the lifting plate (3) and is rotatably connected to the rotating drum (16). A driven gear (17) is fixedly connected to the outer wall of the rotating drum (16). A driving gear (18) is rotatably connected to the bottom of the lifting plate (3). The driving gear (18) meshes with the driven gear (17). A spline groove (21) is provided on the central shaft of the driving gear (18). The inner wall of the machine body (1) is... A motor (19) is fixedly connected to the part. The output end of the motor (19) extends to the top of the machine body (1) and is fixedly connected to a spline shaft (20). The spline shaft (20) is slidably connected to the spline groove (21). A clearance groove (22) is provided on the top of the loading platform (12). A rotating roller (23) is rotatably connected between the two mounting blocks (5) on which the first air cylinder (6) is installed. The rotating roller (23) passes through the clearance groove (22). There are two rotating rollers (23) and two clearance grooves (22) symmetrically arranged.

6. The clamping device for testing the compressive strength of cement according to claim 5, characterized in that: The clamping assembly includes a second pressure rod (14) fixedly connected to the second piston plate (13). A pressure block (15) is fixedly connected to one end of the second pressure rod (14) away from the second piston plate (13). Rubber pads are fixedly connected to the sides of the two pressure blocks (15) that are close to each other.

7. The clamping device for testing the compressive strength of cement according to claim 6, characterized in that: The first push rod (9) is set as a square rod, and a limit frame (26) is fixedly connected between the inner walls of the first piston plate. The first push rod (9) passes through the limit frame (26) and is slidably connected with the limit frame (26).

Images