A device for testing the crack resistance of cement

Abstract

This application belongs to the technical field of testing devices and discloses a cement crack resistance testing device, including a testing box with a hollow structure and an open top. A lifting assembly is installed on the testing box, and a testing head is installed on the lifting section of the lifting assembly. A pressure sensor is installed on the testing head. A positioning seat is installed inside the testing box, and two clamping blocks are slidably mounted on the positioning seat. A displacement assembly is jointly provided on the positioning seat and the testing box to drive the two clamping blocks to clamp or release the cement specimen to be tested when the testing head descends or rises. The lifting assembly includes a mounting frame fixed to the top of the testing box, a vertical rod extending through the top of the mounting frame and slidably cooperating with the mounting frame, a hydraulic push rod fixed to the top of the mounting frame, and a lifting plate fixed to the lower end of the vertical rod. This application, through improvements to the existing structure, eliminates the waiting time required by existing technologies for manual clamping to drive the testing head to descend, thus improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of testing device technology, and in particular to a testing device for the crack resistance of cement. Background Technology

[0002] As the most crucial cementitious material in the construction engineering field, the crack resistance of cement-based specimens formed after hardening directly determines the overall load-bearing capacity, durability, and service safety of concrete structures. It is a core indicator that must be tested in the inspection of cement raw materials upon arrival, the control of construction quality, and the acceptance of structural performance.

[0003] The clamping and releasing of the specimens must be done manually, and is completely independent of the lifting and lowering loading action of the testing head. It is impossible to achieve linkage operation. This not only increases the number of steps for operators, but also requires repeated manual clamping and releasing operations for each test in batch testing, which greatly extends the testing cycle of a single set of specimens and reduces the overall testing efficiency. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a device for testing the crack resistance of cement.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a cement crack resistance testing device, comprising a testing box with a hollow structure and an open top, a lifting assembly on the testing box, a testing head on the lifting section of the lifting assembly, a pressure sensor on the testing head, a positioning seat inside the testing box, two clamping blocks slidably disposed on the positioning seat, and a displacement assembly jointly disposed on the positioning seat and the testing box for driving the two clamping blocks to clamp or release the cement specimen to be tested when the testing head descends or rises.

[0006] By adopting the above technical solution, the cement specimen to be tested is first placed between two clamping blocks. Then, the lifting assembly drives the testing head to descend. During this process, the testing head descends and approaches the top of the cement specimen. The displacement assembly drives the two clamping blocks to move closer together and clamp the cement specimen. Then, the testing head continues to descend and presses against the top wall of the cement specimen to reach the predetermined pressure, while the two blocks remain clamped to the cement specimen. If the cement specimen does not break or become damaged, it can be judged as qualified. After the test is completed, the lifting assembly drives the testing head to rise and reset. During this process, the displacement assembly drives the two clamping blocks to release the specimen. This eliminates the waiting time required by existing technology where manual clamping is needed to drive the testing head to descend, thus improving testing efficiency.

[0007] Furthermore, the lifting assembly includes a mounting frame fixed to the top of the testing box, a vertical rod extending through the top of the mounting frame and slidingly engaging with the mounting frame, a hydraulic push rod fixed to the top of the mounting frame, and a lifting plate fixed to the lower end of the vertical rod. The push rod end of the hydraulic push rod extends through the top of the mounting frame and slides through the mounting frame. The testing head is fixed to the bottom of the lifting plate.

[0008] By adopting the above technical solution, the hydraulic push rod extends or retracts at its end, which in turn drives the lifting plate fixed to the end of the hydraulic push rod and the detection head fixed to the lifting plate to rise and fall, thus ensuring normal detection operation.

[0009] Furthermore, the top of the positioning seat is provided with a limiting groove that slides with the clamping block. The number of displacement components, the number of clamping blocks, and the number of limiting grooves are all equal and their positions correspond one-to-one. The displacement component includes a crossbar that passes through the inner wall of the limiting groove and slides with the positioning seat, a limiting block fixed to the end of the crossbar away from the positioning seat, a first spring fixed between the limiting block and the positioning seat, a limiting block fixed to the clamping block, and a pressing block fixed to the bottom of the lifting plate. The end of the crossbar away from the limiting block is fixedly connected to the clamping block. An inclined surface is provided at the junction of the top of the limiting block and the side wall of the limiting block away from the clamping block. The distance between the two inclined surfaces gradually increases from top to bottom.

[0010] By adopting the above technical solution, during the descent of the lifting plate, the extrusion block is driven to descend. First, the lower end of the extrusion block contacts the inclined surface of the limiting block, and the limiting block moves towards the cement specimen under force. This causes the clamping block fixed to the limiting block, the crossbar fixed to the clamping block, and the limiting block fixed to the crossbar to move synchronously. The first spring is stressed and gradually contracts. Then, the side wall of the extrusion block near the limiting block contacts the side wall of the limiting block away from the specimen. At this time, the two clamping blocks clamp the specimen. Then, the lifting plate continues to drive the extrusion block and the detection head to descend until the detection head... The pressure reaches the predetermined value, and during this process, the two clamping blocks remain stationary and clamp the specimen. After the test is completed, the lifting plate rises, causing the squeezing block to rise and move away from the limiting block. The first spring gradually extends and resets, which in turn causes the limiting block fixed to the first spring, the crossbar fixed to the limiting block, and the clamping block fixed to the crossbar to move away from the specimen, thus realizing the release of the specimen.

[0011] Furthermore, the positioning seat consists of two pieces, both of which are slidably installed inside the testing box. Both positioning seats are U-shaped. The horizontal section of the positioning seat is provided with a chip removal hole through it, located between the two clamping blocks. The other positioning seat is also provided with a crossbar, a limiting block, a first spring, and a limiting block. The positioning seats and the testing box are jointly provided with a moving component for driving the two positioning seats to move synchronously and a chip blocking mechanism for blocking the bottom of the chip removal hole during cement specimen testing. The number of chip blocking mechanisms, the number of moving components, and the number of positioning seats are all equal and their positions correspond one-to-one.

[0012] By adopting the above technical solution, the setting of two positioning seats can realize the alternating testing of two sets of specimens. When conducting multiple sets of tests, it is not necessary to clean the cement and cement debris generated on the positioning seats after testing before the next set of specimens can be tested, which shortens the waiting time caused by cleaning and helps to improve testing efficiency.

[0013] Furthermore, the moving component includes a linear module fixed to the inner side wall of the detection box, a limiting wheel rotatably mounted on the bottom of the positioning seat, and a slide rail fixed to the inner bottom wall of the detection box and rollingly cooperating with the limiting wheel. The moving end of the linear module is fixedly connected to two positioning seats.

[0014] By adopting the above technical solution, when the linear module is working, its moving end moves, which can drive the two positioning seats fixed to the moving end of the linear module to move synchronously, so as to ensure the operation of alternating tests.

[0015] Furthermore, the chip-blocking mechanism includes a chip-blocking assembly, which includes a baffle slidably disposed at the bottom of the horizontal section of the positioning seat corresponding to the chip discharge hole, a mounting plate fixed to the positioning seat, a rod fixed to the mounting plate, and a second spring fixed between the mounting plate and the baffle. The side wall of the baffle is provided with a slot for inserting the rod. The chip-blocking mechanism also includes a storage component for driving the baffle to move when the positioning seat moves and storing the debris located in the chip discharge hole.

[0016] By adopting the above technical solution, when the cement specimen is tested on the positioning seat, the generated debris will fall into the chip discharge hole, and the baffle will act as a shield. As the positioning seat moves out of the mounting frame, the baffle connected to the positioning seat test box, the mounting plate connected to the positioning seat, the plug rod connected to the mounting plate, and the second spring connected to the mounting plate will all move synchronously. During this process, the storage component drives the baffle to move and releases the shielding of the debris in the chip discharge hole. At the same time, the debris in the chip discharge hole will fall freely from its bottom and finally be stored by the storage component for subsequent processing and cleaning of debris on the positioning seat.

[0017] Furthermore, the storage component includes a storage cart that is disposed through the side wall of the testing box and slides in cooperation with the testing box, and a handle fixed on the storage cart. The chip-blocking mechanism also includes a limiting component for locking when the storage cart is connected to the testing box.

[0018] By adopting the above technical solution, during the movement of the positioning seat, the baffle will contact the surface of the storage vehicle. The storage vehicle limits the baffle, keeping it stationary, while the mounting plate continues to move, driving the rod fixed to the mounting plate to continue moving. The rod moves along the slot, and the second spring is stressed and gradually contracts. The debris in the chip discharge hole will fall from its bottom into the storage vehicle for storage, realizing the operation of the baffle automatically releasing the obstruction of the chip discharge hole.

[0019] Furthermore, the limiting component includes an insert that passes through the handle and slides in cooperation with the handle, an adjusting shaft that is rotatably mounted on the insert, a positioning block that is fixed to the detection box and has a U-shaped structure, an adjusting plate that is slidably mounted on the handle, and a pull handle that is fixed to the adjusting plate. The insert is inserted into the U-shaped inner wall of the positioning block, and the adjusting plate has a through-hole that slides in cooperation with the adjusting shaft.

[0020] By adopting the above technical solution, pulling the handle moves it away from the testing box, thereby causing the adjustment plate fixed to the handle to move synchronously. During this process, the oblique hole squeezes and drives the adjustment shaft to move away from the positioning block, which in turn drives the insert connected to the adjustment shaft to move and separate from the positioning block, thus releasing the locking state between the storage cart and the testing box. The setting of the limit component improves the stability when the storage cart and the testing box are connected.

[0021] Furthermore, a sliding hole is provided through the handle, and the chip-blocking mechanism also includes a reset component. The reset component includes a slider fixed to the bottom of the adjustment plate and slidingly engaged with the sliding hole, a limiting rod fixed in the sliding hole and slidingly engaged with the slider, and a third spring fixed between the slider and the sliding hole.

[0022] By adopting the above technical solution, as the adjusting plate moves away from the detection box, the slider fixed to the adjusting plate moves synchronously. The third spring is stressed and gradually contracts. When the handle is released, the third spring gradually extends and returns to its original position, thereby driving the slider fixed to the third spring and the adjusting plate fixed to the slider to move closer to the detection box. This allows the adjusting shaft and the insert to move closer to the positioning block until the insert is inserted into the positioning block, thus achieving locking between the detection box and the storage vehicle.

[0023] Furthermore, the displacement assembly also includes a roller rotatably mounted on the extrusion block and rollingly engaging with the limiting block, and a stop block is fixed to the top of the horizontal section of the positioning seat.

[0024] By adopting the above technical solution, the setting of rollers reduces the friction during the process of the extrusion block descending and contacting the limiting block.

[0025] In summary, the present invention has the following beneficial effects: In this application, by improving the existing structure, the waiting time required by the prior art for manual clamping to drive the detection head to descend for detection is eliminated, which is conducive to improving detection efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the internal structure of the testing box in an embodiment of the present invention; Figure 4 This is a planar schematic diagram of an embodiment of the present invention to highlight the connection structure between the clamping block and the positioning seat; Figure 5 This is an exploded view of an embodiment of the present invention to highlight the connection structure between the insert rod and the baffle. Figure 6 This is a schematic diagram illustrating the connection structure between the insert and the positioning block in an embodiment of the present invention; Figure 7 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the connection structure between the adjustment plate and the handle.

[0027] In the diagram: 1. Detection box; 2. Lifting assembly; 21. Mounting bracket; 22. Vertical rod; 23. Hydraulic push rod; 24. Lifting plate; 3. Detection head; 4. Positioning seat; 5. Clamping block; 6. Displacement assembly; 61. Horizontal bar; 62. Limiting block; 63. First spring; 64. Restricting block; 65. Extrusion block; 66. Roller; 7. Chip removal hole; 8. Moving assembly; 81. Linear module; 82. Limiting wheel; 83. Slide rail; 9. Chip blocking mechanism; 91. Chip blocking assembly; 911. Baffle; 912. Mounting plate; 913. Insert rod; 914. Second spring; 915. Slot; 92. Storage assembly; 921. Storage cart; 922. Handle; 93. Limiting assembly; 931. Insert bar; 932. Adjusting shaft; 933. Positioning block; 934. Adjusting plate; 935. Pull handle; 936. Angled hole; 94. Reset assembly; 941. Slider; 942. Limiting rod; 943. Third spring; 10. Sliding hole; 11. Stop. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] like Figure 1-7 As shown in the embodiment of this application, a cement crack resistance testing device is disclosed, including a testing box 1, a lifting assembly 2, a displacement assembly 6, a moving assembly 8, and a chip-blocking mechanism 9. The testing box 1 has a hollow structure with an open top. A testing head 3 is provided on the lifting section of the lifting assembly 2, and a pressure sensor is provided on the testing head 3. A positioning seat 4 is provided inside the testing box 1, and two clamping blocks 5 are slidably arranged on the positioning seat 4. The top of the positioning seat 4 has a limiting groove clamping block 5 that slides with the clamping blocks 5. First, the cement specimen to be tested is placed between the two clamping blocks 5. Then, the lifting assembly 2 drives the testing head 3 to descend. During this process, the testing head 3 descends and approaches the top of the cement specimen. The displacement assembly 6 drives the two clamping blocks 5 to approach each other and clamp the cement specimen. Then, the testing head 3 continues to descend and presses against the top wall of the cement specimen to reach a predetermined pressure, while the two blocks still maintain the state of clamping the cement specimen. If the cement specimen does not break or become damaged, it can be judged that the cement specimen is qualified. After the test is completed, the lifting assembly 2 drives the test head 3 to rise and reset. During this process, the displacement assembly 6 drives the two clamping blocks 5 to release the specimen. This eliminates the waiting time required by existing technology where manual clamping is needed to lower the test head 3, thus improving testing efficiency. The hydraulic push rod 23 extends or retracts its end, which in turn drives the lifting plate 24, which is fixed to the end of the hydraulic push rod 23, and the test head 3, which is fixed to the lifting plate 24, to rise and fall, ensuring normal testing operation.

[0030] Two positioning seats 4 are provided and slidably installed inside the testing box 1. Both positioning seats 4 have a U-shaped structure. The other positioning seat 4 is also equipped with a crossbar 61, a limiting block 62, a first spring 63, and a limiting block 64. A chip removal hole 7 is provided through the horizontal section of the positioning seat 4 between the two clamping blocks 5. The arrangement of two positioning seats 4 allows for alternating testing of two sets of specimens. When conducting multiple sets of tests, it is not necessary to clean the cement and cement debris generated on the positioning seats 4 after testing before proceeding to the next set of specimens, thus shortening the waiting time caused by cleaning and improving testing efficiency.

[0031] The lifting assembly 2 is mounted on the testing box 1. The lifting assembly 2 includes a mounting frame 21, a vertical rod 22, a hydraulic push rod 23, and a lifting plate 24. The mounting frame 21 is fixed to the top of the testing box 1, and the vertical rod 22 passes through the top of the mounting frame 21 and slides in cooperation with it. The hydraulic push rod 23 is fixed to the top of the mounting frame 21, and its push rod end passes through the top of the mounting frame 21 and slides in cooperation with it. The lifting plate 24 is fixed to the lower end of the vertical rod 22, and the testing head 3 is fixed to the bottom of the lifting plate 24.

[0032] Displacement components 6 are jointly mounted on the positioning seat 4 and the detection box 1. Displacement components 6 are used to drive the two clamping blocks 5 to clamp or release the cement specimen to be tested when the detection head 3 descends or rises. The number of displacement components 6, the number of clamping blocks 5, and the number of limiting grooves are all equal and their positions correspond one-to-one. Displacement components 6 include a crossbar 61, a limiting block 62, a first spring 63, a restricting block 64, and a pressing block 65. The crossbar 61 passes through the inner wall of the limiting groove and slides with the positioning seat 4. The end of the crossbar 61 away from the limiting block 62 is fixedly connected to the clamping block 5. The limiting block 62 is fixed to the end of the crossbar 61 away from the positioning seat 4. The first spring 63 is fixed between the limiting block 62 and the positioning seat 4, and the restricting block 64 is fixed to the clamping block 5. An inclined surface is provided at the junction of the top of the limiting block 64 and the side wall of the limiting block 64 away from the clamping block 5. The distance between the two inclined surfaces gradually increases from top to bottom. The extrusion block 65 is fixed to the bottom of the lifting plate 24. During the descent of the lifting plate 24, the extrusion block 65 is driven to descend. First, the lower end of the extrusion block 65 contacts the inclined surface of the limiting block 64. The limiting block 64 is forced to move towards the cement specimen, which in turn drives the clamping block 5 fixed to the limiting block 64, the crossbar 61 fixed to the clamping block 5, and the limiting block 62 fixed to the crossbar 61 to move synchronously. The first spring 63 is forced and gradually contracts. Then, the side wall of the extrusion block 65 near the limiting block 64 contacts the side wall of the limiting block 64 away from the specimen. At this time, the two clamping blocks 5 clamp the specimen. Then, the lifting plate 24 continues to drive the extrusion block 65 and the detection head 3 to descend until the detection head 3... When the pressure reaches the predetermined value, the two clamping blocks 5 remain stationary and clamp the specimen. After the test is completed, the lifting plate 24 rises, causing the pressing block 65 to rise and move away from the limiting block 64. The first spring 63 gradually extends and resets, thereby causing the limiting block 62 fixed to the first spring 63, the crossbar 61 fixed to the limiting block 62, and the clamping block 5 fixed to the crossbar 61 to move away from the specimen, thus realizing the release of the specimen.

[0033] The moving assembly 8 is mounted on both the positioning base 4 and the testing box 1, and is used to drive the two positioning bases 4 to move synchronously. The moving assembly 8 includes a linear module 81, a limiting wheel 82, and a slide rail 83. The linear module 81 is fixed to the inner wall of the testing box 1. The moving ends of the linear module 81 are fixedly connected to the two positioning bases 4. The limiting wheel 82 is rotatably mounted on the bottom of the positioning base 4, and the slide rail 83 is fixed to the inner bottom wall of the testing box 1 and rolls in cooperation with the limiting wheel 82. When the linear module 81 is working, its moving end moves, which drives the two positioning bases 4 fixed to the moving end of the linear module 81 to move synchronously, ensuring the operation of alternating tests.

[0034] A chip-blocking mechanism 9 is jointly mounted on the positioning seat 4 and the testing box 1. The chip-blocking mechanism 9 is used to block the bottom of the chip discharge hole 7 during cement specimen testing. The chip-blocking mechanism 9 includes a chip-blocking component 91, a storage component 92, a limiting component 93, and a reset component 94. The chip-blocking component 91 includes a baffle 911, a mounting plate 912, a rod 913, and a second spring 914. The baffle 911 is slidably mounted on the bottom of the horizontal section of the positioning seat 4 at a position corresponding to the chip discharge hole 7. A slot 915 for insertion into the rod 913 is provided on the side wall of the baffle 911. The mounting plate 912 is fixed to the positioning seat 4. The rod 913 is fixed to the mounting plate 912, and the second spring 914 is fixed between the mounting plate 912 and the baffle 911. When the cement specimen is tested on the positioning seat 4, the generated debris falls into the chip discharge hole 7, and the baffle 911 acts as a shield. As the positioning seat 4 moves out of the mounting frame 21, the baffle 911 connected to the testing box 1 of the positioning seat 4, the mounting plate 912 connected to the positioning seat 4, the insertion rod 913 connected to the mounting plate 912, and the second spring 914 connected to the mounting plate 912 all move synchronously. During this process, the storage component 92 drives the baffle 911 to move and release the shielding of the debris in the chip discharge hole 7. At the same time, the debris in the chip discharge hole 7 falls freely from its bottom and is finally stored by the storage component 92 for subsequent processing and cleaning of debris on the positioning seat 4.

[0035] The storage component 92 is used to drive the baffle 911 to move and store the debris located in the chip discharge hole 7 when the positioning seat 4 moves. The storage component 92 includes a storage cart 921 and a handle 922. The storage cart 921 is disposed through the side wall of the detection box 1 and slides in cooperation with the detection box 1. The handle 922 is fixed to the storage cart 921. During the movement of the positioning seat 4, the baffle 911 will contact the surface of the storage cart 921. The storage cart 921 limits the baffle 911, so that the baffle 911 is stationary. The mounting plate 912 continues to move, and drives the insertion rod 913 fixed to the mounting plate 912 to continue to move. The insertion rod 913 moves along the slot 915, and the second spring 914 is stressed and gradually contracts. The debris in the chip discharge hole 7 will fall from its bottom into the storage cart 921 for storage, realizing the operation of the baffle 911 automatically releasing the obstruction of the chip discharge hole 7.

[0036] The limiting assembly 93 is used to lock the storage cart 921 when it is connected to the detection box 1. The limiting assembly 93 includes a strip 931, an adjusting shaft 932, a positioning block 933, an adjusting plate 934, and a handle 935. The strip 931 is inserted through the handle 922 and slides in engagement with it. The adjusting shaft 932 is rotatably mounted on the strip 931. The positioning block 933 is fixed to the detection box 1 and has a U-shaped structure. The strip 931 is inserted into the U-shaped inner wall of the positioning block 933. The adjusting plate 934 is slidably mounted on the handle 922. The adjusting plate 934 has a through-hole 936 that slides in engagement with the adjusting shaft 932. The handle 935 is fixed to the adjusting plate 934. Pulling the handle 935 moves it away from the detection box 1, which in turn drives the adjusting plate 934, which is fixed to the handle 935, to move synchronously. During this process, the oblique hole 936 squeezes and drives the adjusting shaft 932 to move away from the positioning block 933, which in turn drives the insert 931 connected to the adjusting shaft 932 to move and separate from the positioning block 933, thereby releasing the locked state between the storage cart 921 and the detection box 1. The setting of the limit component 93 improves the stability when the storage cart 921 is connected to the detection box 1.

[0037] A sliding hole 10 is provided through the handle 922. The reset assembly 94 includes a slider 941, a limiting rod 942, and a third spring 943. The slider 941 is fixed to the bottom of the adjusting plate 934 and slides in cooperation with the sliding hole 10. The limiting rod 942 is fixed inside the sliding hole 10 and slides in cooperation with the slider 941. The third spring 943 is fixed between the slider 941 and the sliding hole 10. As the adjusting plate 934 moves away from the detection box 1, it drives the slider 941 fixed to the adjusting plate 934 to move synchronously. The third spring 943 is stressed and gradually contracts. When the handle 935 is released, the third spring 943 gradually extends and returns to its original position, thereby driving the slider 941 fixed to the third spring 943 and the adjusting plate 934 fixed to the slider 941 to move towards the detection box 1. This causes the adjusting shaft 932 and the insert 931 to move towards the positioning block 933 until the insert 931 is inserted into the positioning block 933, thus achieving the locking between the detection box 1 and the storage cart 921.

[0038] The displacement assembly 6 also includes rollers 66, which are rotatably mounted on the extrusion block 65 and roll in engagement with the limiting block 64. A stop block 11 is fixed to the top of the horizontal section of the positioning seat 4. The rollers 66 reduce the friction during the descent of the extrusion block 65 and its contact with the limiting block 64.

[0039] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A device for testing the crack resistance of cement, characterized in that: The test box (1) has a hollow structure with an open top. A lifting assembly (2) is provided on the test box (1). A test head (3) is provided on the lifting section of the lifting assembly (2). A pressure sensor is provided on the test head (3). A positioning seat (4) is provided inside the test box (1). Two clamping blocks (5) are slidably provided on the positioning seat (4). A displacement assembly (6) is provided on the positioning seat (4) and the test box (1) to drive the two clamping blocks (5) to clamp or release the cement specimen to be tested when the test head (3) descends or rises.

2. The cement crack resistance testing device according to claim 1, characterized in that: The lifting assembly (2) includes a mounting frame (21) fixed to the top of the detection box (1), a vertical rod (22) that passes through the top of the mounting frame (21) and slides with the mounting frame (21), a hydraulic push rod (23) fixed to the top of the mounting frame (21), and a lifting plate (24) fixed to the lower end of the vertical rod (22). The push rod end of the hydraulic push rod (23) passes through the top of the mounting frame (21) and slides with the mounting frame (21). The detection head (3) is fixed to the bottom of the lifting plate (24).

3. The cement crack resistance testing device according to claim 1, characterized in that: The top of the positioning seat (4) is provided with a limiting groove that slides with the clamping block (5). The number of groups of the displacement component (6), the number of clamping blocks (5) and the number of limiting grooves are all equal and their positions correspond one to one. The displacement component (6) includes a crossbar (61) that passes through the inner wall of the limiting groove and slides with the positioning seat (4), a limiting block (62) fixed to the end of the crossbar (61) away from the positioning seat (4), a first spring (63) fixed between the limiting block (62) and the positioning seat (4), a limiting block (64) fixed on the clamping block (5) and a pressing block (65) fixed to the bottom of the lifting plate (24). The end of the crossbar (61) away from the limiting block (62) is fixedly connected to the clamping block (5). An inclined surface is provided at the junction of the top of the limiting block (64) and the side wall of the limiting block (64) away from the clamping block (5). The distance between the two inclined surfaces gradually increases from top to bottom.

4. The cement crack resistance testing device according to claim 3, characterized in that: The positioning seat (4) is provided in two pieces and is slidably installed in the test box (1). Both positioning seats (4) are U-shaped. The other positioning seat (4) is also provided with a crossbar (61), a limiting block (62), a first spring (63) and a limiting block (64). The horizontal section of the positioning seat (4) is provided with a chip removal hole (7) between the two clamping blocks (5). The positioning seat (4) and the test box (1) are provided with a moving component (8) for driving the two positioning seats (4) to move synchronously and a chip blocking mechanism (9) for blocking the bottom of the chip removal hole (7) during cement specimen testing. The number of chip blocking mechanisms (9), the number of moving components (8) and the number of positioning seats (4) are all equal and their positions correspond one-to-one.

5. The cement crack resistance testing device according to claim 4, characterized in that: The moving component (8) includes a linear module (81) fixed on the inner side wall of the detection box (1), a limiting wheel (82) rotatably installed on the bottom of the positioning seat (4), and a slide rail (83) fixed on the inner bottom wall of the detection box (1) and rollingly cooperating with the limiting wheel (82). The moving end of the linear module (81) is fixedly connected to the two positioning seats (4).

6. The cement crack resistance testing device according to claim 4, characterized in that: The chip blocking mechanism (9) includes a chip blocking assembly (91), which includes a baffle (911) slidably disposed at the bottom of the horizontal section of the positioning seat (4) corresponding to the chip discharge hole (7), a mounting plate (912) fixed on the positioning seat (4), a plug rod (913) fixed on the mounting plate (912), and a second spring (914) fixed between the mounting plate (912) and the baffle (911). The side wall of the baffle (911) is provided with a slot (915) for inserting the plug rod (913). The chip blocking mechanism (9) also includes a storage assembly (92) for driving the baffle (911) to move and storing the debris located in the chip discharge hole (7) when the positioning seat (4) moves.

7. The cement crack resistance testing device according to claim 6, characterized in that: The storage component (92) includes a storage cart (921) that is disposed through the side wall of the test box (1) and slides in cooperation with the test box (1), and a handle (922) fixed on the storage cart (921). The chip blocking mechanism (9) also includes a limiting component (93) for locking when the storage cart (921) is connected to the test box (1).

8. The cement crack resistance testing device according to claim 7, characterized in that: The limiting component (93) includes an insert (931) that passes through the handle (922) and slides with the handle (922), an adjusting shaft (932) that is rotatably mounted on the insert (931), a positioning block (933) that is fixed on the detection box (1) and has a U-shaped structure, an adjusting plate (934) that is slidably mounted on the handle (922), and a pull handle (935) that is fixed on the adjusting plate (934). The insert (931) is inserted into the U-shaped inner wall of the positioning block (933), and the adjusting plate (934) has a through oblique hole (936) that slides with the adjusting shaft (932).

9. A cement crack resistance testing device according to claim 8, characterized in that: The handle (922) has a through hole (10), and the chip blocking mechanism (9) also includes a reset component (94). The reset component (94) includes a slider (941) fixed to the bottom of the adjusting plate (934) and slidingly engaged with the sliding hole (10), a limiting rod (942) fixed in the sliding hole (10) and slidingly engaged with the slider (941), and a third spring (943) fixed between the slider (941) and the sliding hole (10).

10. A cement crack resistance testing device according to claim 1, characterized in that: The displacement assembly (6) further includes a roller (66) rotatably mounted on the extrusion block (65) and rollingly engaged with the limiting block (64), and a stop block (11) is fixed to the top of the horizontal section of the positioning seat (4).

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