Concrete-based compression testing machine

Abstract

The present invention relates to the technical field of concrete production, and discloses a concrete pressure testing machine, comprising four vertically arranged connecting frames, a support platform arranged at the bottom of the connecting frames, and a power platform arranged at the top of the connecting frames, a power rod is arranged vertically through the power platform, and a pressure plate is arranged horizontally at the bottom of the power rod; a protective plate and three protective nets, the protective plate and the three protective nets are respectively arranged on two adjacent connecting frames, the protective plate and the connecting frames are fixedly connected, a plurality of connecting seats are arranged in the middle of the connecting frames, and hinged rods are arranged horizontally on both outer sides of one end of each protective net, and each hinged rod is hinged to a connecting seat, the bottom of the protective plate is lower than the top of the support platform, and the top is higher than the pressure plate; a first positioning mechanism for fixing the free end of the protective net is arranged at the top of the connecting frame, and a second positioning mechanism for fixing the free end of the protective net is arranged at the bottom. The present invention makes the test safer.

Description

Technical Field

[0001] The invention relates to the technical field of concrete production, in particular to a pressure testing machine based on concrete. Background Art

[0002] During the production process of concrete prefabricated parts or admixtures, it is usually necessary to test the prefabricated parts or concrete blocks with admixtures added. When conducting some force-related tests, the raw materials of the prefabricated parts or the raw materials with admixtures added are usually used to make cube-shaped or rectangular concrete blocks for testing (some are directly tested on prefabricated parts and admixtures, while others are tested after the concrete blocks are made).

[0003] Among the many tests, there is a compression test on concrete blocks; the compression test is usually carried out by a pressure testing machine; the pressure testing machine usually mainly includes a main box (built-in control circuit, power supply, motor, etc.) and a test bracket set on the side of the main box, the bottom of the test bracket has a support platform, the top has a drive shell, and a test rod is vertically passed through the drive shell. The bottom of the test rod has a pressure plate; during the test, the concrete block to be tested is first placed on the support platform, and then the motor (reduction motor, slow speed but large force) in the main box drives the drive wheel to rotate, and the test rod is driven downward during the rotation of the drive wheel (the drive wheel and the test rod are threadedly connected) until the pressure plate is pressed against the top of the concrete block, and the pressure is continued until the concrete block breaks or cracks appear; during the whole process, the pressure sensor on the pressure plate or the support table transmits the pressure received, and automatically converts it into a pressure value through a computer, thereby achieving the test of the concrete's compressive capacity. Not only that, when testing some relatively large or hard concrete blocks, it is usually necessary to connect a protective net around the test bracket to prevent the concrete from breaking and injuring workers. Summary of the invention

[0004] The object of the present invention is to provide a concrete-based compression testing machine, aiming to achieve the purpose of safe testing.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A concrete-based pressure testing machine, comprising:

[0006] Four vertically arranged connecting frames, a supporting platform arranged at the bottom of the connecting frames, and a power platform arranged at the top of the connecting frames, a power rod vertically passing through the power platform, and a pressure plate horizontally arranged at the bottom of the power rod;

[0007] A protective plate and three protective nets, wherein the protective plate and the three protective nets are respectively arranged on two adjacent connecting frames, the protective plate and the connecting frames are fixedly connected, a plurality of connecting seats are arranged in the middle of the connecting frames, hinged rods are arranged horizontally on both outer sides of one end of each of the protective nets, each of the hinged rods is hinged to one of the connecting seats, the bottom of the protective plate is lower than the top of the support platform, and the top is higher than the pressure plate;

[0008] The top of the connecting frame is provided with a first positioning mechanism for fixing the free end of the protective net, and the bottom of the connecting frame is provided with a second positioning mechanism for fixing the free end of the protective net.

[0009] The present invention is further configured as follows: the first positioning mechanism comprises an L-shaped first positioning body, the bottom end of the first positioning body is fixedly connected to the connecting frame, the top end is vertical, and there is a set distance between the vertical part of the first positioning body and the connecting frame;

[0010] A positioning rod is hingedly provided on the protective net, one end of the positioning rod is connected to the protective net, and the other end is located on the outside of the protective net, and an elastic member is provided between the middle part of the positioning rod and the protective net. When the positioning rod is engaged between the first positioning body and the connecting frame, the protective net is in a vertical state, the elastic member is below the positioning rod, and the elastic member is in an extended state.

[0011] The present invention is further configured as follows: the positioning rod includes a connecting tube and a driving rod rotatably connected to the inner cavity of the connecting tube, the connecting tube is connected to the protective net and the elastic member, and the projection of the free end of the connecting tube in the vertical direction is located between the two ends of the projection of the protective net in the vertical direction.

[0012] The present invention is further configured as follows: a T-shaped clearance groove is provided on the side of the free end of the protective net, and the connecting tube and the elastic member form a T-shape that matches the clearance groove.

[0013] The present invention is further configured as follows: limiting plates are provided on both sides of the protection net, and the connecting tube and the elastic member are both movably in contact with the inner wall of the limiting plate.

[0014] The present invention is further configured as follows: a termination plate is obliquely arranged at one end of the limit plate away from the protective net, and both sides of the termination plate are fixedly connected to two oppositely arranged limit plates, and when the connecting tube is rotated to the maximum angle, the connecting tube contacts the inner wall of the termination plate.

[0015] The present invention is further configured as follows: a protective plate is provided on the driving rod, a set distance is provided between the protective plate and the connecting tube, and a projection of the first positioning body in the vertical direction is located between a projection of the protective plate in the vertical direction and a projection of the connecting tube in the vertical direction.

[0016] The present invention is further configured as follows: the second positioning mechanism includes an L-shaped second positioning body, the top end of the second positioning body is fixedly connected to the connecting frame, the bottom end is vertical, and there is a set distance between the vertical part of the second positioning body and the connecting frame, and when the driving rod is engaged between the second positioning body and the connecting frame, the elastic member is in an extended state, and the elastic member is located above the connecting tube.

[0017] The present invention is further configured as follows: a first arc-shaped first guide portion is obliquely provided at the top of the first positioning body on a side away from the connecting frame, the top of the first guide portion is connected to the top of the first positioning body, and a second arc-shaped second guide portion is obliquely provided at the bottom of the second positioning body on a side away from the connecting frame, the bottom of the second guide portion is connected to the bottom of the second positioning body.

[0018] The present invention is further configured as follows: the support platform is cylindrical, a cleaning pad is horizontally arranged on the top of the support platform, a C-shaped anti-fall portion is vertically arranged on the top periphery of the cleaning pad, a plurality of locking bodies are vertically arranged on the bottom periphery, the inner wall of the locking body is in contact with the outer wall of the support platform, a plurality of arc-shaped guide bodies are obliquely arranged on the bottom of the locking body, a set distance is provided between the bottom of the guide body and the outer wall of the support platform, the top is connected to the bottom end of the locking body, and the curvature of the anti-fall portion is 3π / 2.

[0019] The beneficial effects of the present invention are as follows: first, a main box is provided on one side of the connecting frame, and the protective plate is located between the main box and the connecting frame; the protective plate is solid and has a large length, so it can always maintain a good protective state, and there is no need to remove it; and because the protective plate is a solid structure, it can fully block the concrete that collapses during the detection process, thereby protecting the main box.

[0020] During the testing process, if protection is not needed, for example, when the concrete block is small and not prone to collapse, the protective net is rotated to connect the protective net to the first positioning mechanism, so that the space between the bottom of the pressure plate and the top of the support platform is exposed, which is convenient for placing in and taking out the concrete blocks, as well as cleaning the support platform after the test; but if it is necessary to test a larger concrete block, the protective net is rotated to connect the protective net to the second positioning mechanism, so that it can play a protective role; when taking out the test block, it is only necessary to rotate the protective net on one side again to connect with the first positioning mechanism, and then take out the concrete block and clean the support platform, which is simple and convenient.

[0021] The main box, connecting frame, support platform, power platform, etc. are the same as the concrete testing machines currently on the market. Their internal structure and working principle are not described in detail here, and they will not affect the understanding and implementation of the present application by those skilled in the art. In another embodiment, an oil cylinder is arranged above the power platform. During the test, the oil cylinder drives the power rod downward, and a pressure sensor is arranged below the pressure plate to sense the pressure value on the concrete, which is then transmitted and recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a concrete pressure testing machine of the present invention;

[0024] Figure 2 yes Figure 1 A magnified view of part A;

[0025] Figure 3 yes Figure 1 A magnified view of part B;

[0026] Figure 4 is a cross-sectional view of an embodiment of a concrete pressure testing machine according to the present invention;

[0027] Figure 5 yes Figure 4 Enlarged view of part C;

[0028] Figure 6 It is a structural schematic diagram of an embodiment of the protective net part of the concrete-based pressure testing machine of the present invention;

[0029] Figure 7yes Figure 6 A magnified view of part D in the middle;

[0030] Figure 8 It is a structural schematic diagram of an embodiment of a cleaning pad part in a concrete-based pressure testing machine of the present invention.

[0031] In the figure, 1, connecting frame; 2, supporting platform; 3, power platform; 4, power rod; 5, pressure plate; 6, protective plate; 7, protective net; 8, connecting seat; 9, hinged rod; 10, first positioning body; 11, positioning rod; 11a, connecting tube; 11b, driving rod; 12, elastic member; 13, clearance groove; 14, limiting plate; 15, ending plate; 16, protective disk; 17, second positioning body; 18, first guide part; 19, second guide part; 20, cleaning pad; 21, anti-fall part; 22, engaging body; 23, guide body. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] A concrete based compression testing machine, such as Figures 1 to 8 As shown, including

[0034] Four vertically arranged connecting frames 1, a supporting platform 2 arranged at the bottom of the connecting frames 1, and a power platform 3 arranged at the top of the connecting frames 1, a power rod 4 is arranged vertically through the power platform 3, and a pressure plate 5 is horizontally arranged at the bottom of the power rod 4;

[0035] A protective plate 6 and three protective nets 7, wherein the protective plate 6 and the three protective nets 7 are respectively arranged on two adjacent connecting frames 1, the protective plate 6 and the connecting frames 1 are fixedly connected, a plurality of connecting seats 8 are arranged in the middle of the connecting frames 1, hinge rods 9 are horizontally arranged on both outer sides of one end of each of the protective nets 7, and each of the hinge rods 9 is hinged to one of the connecting seats 8, the bottom of the protective plate 6 is lower than the top of the support platform 2, and the top is higher than the pressure plate 5;

[0036] The top of the connecting frame 1 is provided with a first positioning mechanism for fixing the free end of the protective net 7 , and the bottom is provided with a second positioning mechanism for fixing the free end of the protective net 7 .

[0037] The first positioning mechanism comprises an L-shaped first positioning body 10, the bottom end of the first positioning body 10 is fixedly connected to the connecting frame 1, the top end is vertical, and there is a set distance between the vertical part of the first positioning body 10 and the connecting frame 1;

[0038] A positioning rod 11 is hingedly provided on the protective net 7, one end of the positioning rod 11 is connected to the protective net 7, and the other end is located on the outside of the protective net 7, and an elastic member 12 is provided between the middle part of the positioning rod 11 and the protective net 7. When the positioning rod 11 is engaged between the first positioning body 10 and the connecting frame 1, the protective net 7 is in a vertical state, the elastic member 12 is below the positioning rod 11, and the elastic member 12 is in an extended state.

[0039] The positioning rod 11 includes a connecting tube 11a and a driving rod 11b rotatably connected to the inner cavity of the connecting tube 11a. The connecting tube 11a is connected to the protective net 7 and the elastic member 12. The projection of the free end of the connecting tube 11a in the vertical direction is located between the two ends of the projection of the protective net 7 in the vertical direction.

[0040] A T-shaped clearance groove 13 is formed on the side of the free end of the protection net 7 , and the connecting tube 11 a and the elastic member 12 form a T-shape that matches the clearance groove 13 .

[0041] Limiting plates 14 are disposed on both sides of the protection net 7 , and the connecting tube 11 a and the elastic member 12 are movably in contact with the inner wall of the limiting plates 14 .

[0042] A termination plate 15 is obliquely arranged at one end of the limit plate 14 away from the protective net 7 , and both sides of the termination plate 15 are fixedly connected to two oppositely arranged limit plates 14 . When the connecting tube 11a rotates to the maximum angle, the connecting tube 11a contacts the inner wall of the termination plate 15 .

[0043] A protective plate 16 is provided on the driving rod 11b, and there is a set distance between the protective plate 16 and the connecting tube 11a. The vertical projection of the first positioning body 10 is located between the vertical projection of the protective plate 16 and the vertical projection of the connecting tube 11a.

[0044] The second positioning mechanism includes an L-shaped second positioning body 17, the top of which is fixedly connected to the connecting frame 1, the bottom of which is vertical, and a set distance is provided between the vertical portion of the second positioning body 17 and the connecting frame 1. When the driving rod 11b is engaged between the second positioning body 17 and the connecting frame 1, the elastic member 12 is in an extended state, and the elastic member 12 is located above the connecting tube 11a.

[0045] A first arc-shaped guide portion 18 is obliquely provided at the top of the first positioning body 10 on the side away from the connecting frame 1, and the top of the first guide portion 18 is connected to the top of the first positioning body 10. A second arc-shaped guide portion 19 is obliquely provided at the bottom of the second positioning body 17 on the side away from the connecting frame 1, and the bottom of the second guide portion 19 is connected to the bottom of the second positioning body 17.

[0046] The support platform 2 is cylindrical, and a cleaning pad 20 (preferably made of hard stainless steel or other pressure-resistant materials to ensure its service life) is horizontally arranged on the top of the support platform 2. A C-shaped anti-fall portion 21 is vertically arranged on the top periphery of the cleaning pad 20, and a plurality of locking bodies 22 are vertically arranged on the bottom periphery. The inner wall of the locking body 22 is in contact with the outer wall of the support platform 2, and a plurality of arc-shaped guide bodies 23 are obliquely arranged on the bottom of the locking body 22. There is a set distance between the bottom of the guide body 23 and the outer wall of the support platform 2, and the top is connected to the bottom end of the locking body 22. The curvature of the anti-fall portion 21 is 3π / 2 (i.e., 270°).

[0047] The concrete-based pressure testing machine provided by the present invention is firstly provided with a main box on one side of the connecting frame 1, and the protective plate 6 is located between the main box and the connecting frame 1; wherein the protective plate 6 is solid and has a large length, so it can always maintain a good protective state, and there is no need to remove it; and since the protective plate 6 is a solid structure, it can fully block the concrete that collapses during the detection process, thereby protecting the main box.

[0048] During the detection process, if protection is not needed, for example, when the concrete block is small and it is not easy to cause collapse of the concrete block, the protective net 7 is rotated to connect the protective net 7 to the first positioning mechanism, so that the space between the bottom of the pressure plate 5 and the top of the support platform 2 is exposed, which is convenient for putting in and taking out the concrete block, and cleaning the support platform 2 after the test; but if it is necessary to test a larger concrete block, the protective net 7 is rotated to connect the protective net 7 to the second positioning mechanism, so that it can play a protective role; when taking out the test block, it is only necessary to rotate the protective net 7 on one side again to connect with the first positioning mechanism, and then take out the concrete block and clean the support platform 2, which is simple and convenient.

[0049] The main box, connecting frame 1, support platform 2, power platform 3, etc. are the same as the concrete testing machines currently on the market. Their internal structure and working principle will not be described in detail here, and will not affect the understanding and implementation of the present application by those skilled in the art. In another embodiment, an oil cylinder is arranged above the power platform 3. During the test, the oil cylinder drives the power rod 4 downward, and a pressure sensor is arranged below the pressure plate 5 to sense the pressure value of the concrete, which is then transmitted and recorded.

[0050] When rotating the protective net 7 upward, when it is rotated to approach the first positioning body 10, the worker rotates the positioning rod 11 upward so that the positioning rod 11 can bypass the first positioning body 10. After bypassing (when the limiting plate 14 contacts the outside of the connecting frame 1), the positioning rod 11 is released, and the positioning rod 11 rotates downward under the elastic force of the elastic member 12 (i.e., the spring), and the positioning rod 11 is engaged with the first positioning body 10, and the elastic member 12 is still in an extended state at this time; under the elastic force of the elastic member 12, the positioning rod 11 can be stably engaged in the first positioning body 10, so that under the limiting effect of the first positioning body 10 and the connecting frame 1, the position of the positioning rod 11 can be stably maintained, and at the same time, the positioning rod 11 can support the protective net 7, so that the protective net 7 can not rotate downward; and even if the protective net 7 is not used for a long time, the position of the protective net 7 can also be stably maintained in an upward state, with good stability.

[0051] Similarly, when using the protective net 7, it is only necessary to rotate the positioning rod 11 downward and then engage the positioning rod 11 between the second positioning body 17 and the connecting frame 1, which is simple and convenient. Moreover, during the entire protection process, even if some concrete blocks hit the inner wall of the protective net 7, since the second positioning body 17 can stably engage the positioning rod 11 in the horizontal direction, the position of the positioning rod 11 can be stably maintained, and the position stability of the protective net 7 can also be better maintained.

[0052] Among them, since the protective net 7 can be used or not according to the actual usage situation during use, its application range is wider; at the same time, since the protective net 7 is hinged on the connecting frame 1, there is no need to remove the protective net 7 even if it is not used, and the use effect is better.

[0053] Moreover, since the driving rod 11b and the connecting tube 11a are rotationally connected, firstly, the connecting tube 11a can rotate normally (the connecting tube 11a is hinged to the protective net 7), and at the same time, it can support the driving rod 11b to rotate; in this way, when the worker rotates the protective net 7 through the driving rod 11b, it can better prevent the driving rod 11b and the palm from rotating relative to each other, that is, after the worker pinches the driving rod 11b, the protective net 7 can be directly rotated upward or downward. During this process, the driving rod 11b can avoid relative rotation with the palm, thereby improving the comfort and safety of use (preventing the palm from being injured by friction). At the same time, the setting of the first guide portion 18 and the second guide portion 19 enables the driving rod 11b to rotate directly under the shape of the first guide portion 18 when the driving rod 11b is connected to the first positioning body 10, and the first guide portion 18 can also drive the connecting tube 11a to rotate. In this way, even if the worker does not operate the positioning rod 11, the driving rod 11b can still be engaged between the first positioning body 10 and the connecting frame 1; similarly, the second guide portion 19 can directly transition the driving rod 11b to between the second positioning body 17 and the connecting frame 1.

[0054] During use of the limit plates 14 on both sides of the protective net 7, the connecting tube 11a and the elastic member 12 are both attached to the inner wall of the limit plates 14, so that the limit plates 14 can improve the position stability of the connecting tube 11a and the elastic member 12, and can also better protect the elastic member 12, that is, prevent the elastic member 12 from bending to the outside of the give way groove 13; at the same time, during use, when the protective net 7 is subjected to external force, the connecting tube 11a can transfer the force to the limit plates 14, so it can protect the hinge between the connecting tube 11a and the protective net 7, thereby extending the position stability of the connecting tube 11a and also making it have a longer service life.

[0055] The function of the end plate 15 is that when the worker manually rotates the driving rod 11b, when it is rotated to the maximum angle, the driving rod 11b can pass over the first positioning body 10 or the second positioning body 17. At the same time, the end plate 15 limits the further rotation of the connecting tube 11a, thereby preventing the elastic member 12 from undergoing excessive deformation and extending the service life of the elastic member 12.

[0056] The cleaning pad 20 on the top of the support platform 2 is completely attached to the top of the support platform 2, so it does not affect the normal progress of the test (that is, it does not affect the maximum pressure that the concrete block can withstand when fracturing the concrete block); then after the test is completed, the worker can directly clean the cleaning pad 20, and the cleaning can be done through the opening of the anti-fall part 21; or the cleaning pad 20 can be directly removed from the support platform 2 upwards, and then the entire cleaning pad 20 can be taken out for cleaning, which has a better cleaning effect and is more convenient. The opening of the anti-fall part 21 can make it easier and more convenient to put in the concrete block; and the anti-fall part 21 can not only prevent debris from falling under the support platform 2, but also play a blocking role for the collapsed concrete blocks, so that the protection effect is better. The multiple snap-fit ​​bodies 22 under the cleaning pad 20 ensure good coaxiality between the support platform 2 and the cleaning pad 20, as well as the position stability of the cleaning pad 20. At the same time, the guide body 23 facilitates the compounding or connection between the cleaning pad 20 and the support platform 2.

[0057] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A concrete-based pressure testing machine, characterized in that: include, Four vertically arranged connecting frames (1), a supporting platform (2) arranged at the bottom of the connecting frames (1), and a power platform (3) arranged at the top of the connecting frames (1); a power rod (4) vertically passing through the power platform (3); and a pressure plate (5) horizontally arranged at the bottom of the power rod (4); A protective plate (6) and three protective nets (7), wherein the protective plate (6) and the three protective nets (7) are respectively arranged on two adjacent connecting frames (1), the protective plate (6) and the connecting frames (1) are fixedly connected, a plurality of connecting seats (8) are arranged in the middle of the connecting frames (1), hinge rods (9) are horizontally arranged on both outer sides of one end of each of the protective nets (7), and each of the hinge rods (9) is hinged to a connecting seat (8), and the bottom of the protective plate (6) is lower than the top of the support platform (2), and the top is higher than the pressure plate (5); The top of the connecting frame (1) is provided with a first positioning mechanism for fixing the free end of the protective net (7), and the bottom is provided with a second positioning mechanism for fixing the free end of the protective net (7); The first positioning mechanism comprises an L-shaped first positioning body (10), the bottom end of the first positioning body (10) is fixedly connected to the connecting frame (1), the top end is vertical, and a set distance is provided between the vertical part of the first positioning body (10) and the connecting frame (1); A positioning rod (11) is hingedly provided on the protection net (7), one end of the positioning rod (11) is connected to the protection net (7), and the other end is located outside the protection net (7), an elastic member (12) is provided between the middle part of the positioning rod (11) and the protection net (7), when the positioning rod (11) is engaged between the first positioning body (10) and the connecting frame (1), the protection net (7) is in a vertical state, the elastic member (12) is located below the positioning rod (11), and the elastic member (12) is in an extended state; The positioning rod (11) comprises a connecting tube (11a) and a driving rod (11b) rotatably connected to the inner cavity of the connecting tube (11a); the connecting tube (11a) is connected to the protective net (7) and the elastic member (12); the projection of the free end of the connecting tube (11a) in the vertical direction is located between the two ends of the projection of the protective net (7) in the vertical direction; The second positioning mechanism comprises an L-shaped second positioning body (17), the top end of the second positioning body (17) is fixedly connected to the connecting frame (1), the bottom end is vertical, and a set distance is provided between the vertical portion of the second positioning body (17) and the connecting frame (1), when the driving rod (11b) is engaged between the second positioning body (17) and the connecting frame (1), the elastic member (12) is in an extended state, and the elastic member (12) is located above the connecting tube (11a); A first arc-shaped guide portion (18) is obliquely provided at the top of the first positioning body (10) on a side away from the connecting frame (1), and the top of the first guide portion (18) is connected to the top of the first positioning body (10). A second arc-shaped guide portion (19) is obliquely provided at the bottom of the second positioning body (17) on a side away from the connecting frame (1), and the bottom of the second guide portion (19) is connected to the bottom of the second positioning body (17).

2. The concrete-based compression testing machine according to claim 1, characterized in that: A T-shaped clearance groove (13) is provided on the side of the free end of the protection net (7), and the connecting tube (11a) and the elastic member (12) form a T-shape that matches the clearance groove (13).

3. The concrete-based compression testing machine according to claim 2, characterized in that: Limiting plates (14) are provided on both sides of the protection net (7), and the connecting tube (11a) and the elastic member (12) are both movably in contact with the inner wall of the limiting plate (14).

4. The concrete-based compression testing machine according to claim 3, characterized in that: A stop plate (15) is obliquely arranged at one end of the limit plate (14) away from the protective net (7), and two sides of the stop plate (15) are fixedly connected to two oppositely arranged limit plates (14). When the connecting tube (11a) is rotated to a maximum angle, the connecting tube (11a) contacts the inner wall of the stop plate (15).

5. The concrete-based compression testing machine according to claim 1, characterized in that: A protective plate (16) is provided on the driving rod (11b), and a set distance is provided between the protective plate (16) and the connecting tube (11a), and a projection of the first positioning body (10) in the vertical direction is located between a projection of the protective plate (16) in the vertical direction and a projection of the connecting tube (11a) in the vertical direction.

6. The concrete-based compression testing machine of claim 1, characterized in that: The support platform (2) is cylindrical, a cleaning pad (20) is horizontally arranged on the top of the support platform (2), a C-shaped anti-falling portion (21) is vertically arranged on the top periphery of the cleaning pad (20), and a plurality of engaging bodies (22) are vertically arranged on the bottom periphery, the inner wall of the engaging body (22) is in contact with the outer wall of the support platform (2), and a plurality of arc-shaped guiding bodies (23) are obliquely arranged on the bottom of the engaging body (22), a set distance is provided between the bottom of the guiding body (23) and the outer wall of the support platform (2), and the top is connected to the bottom end of the engaging body (22), and the curvature of the anti-falling portion (21) is 3π / 2.

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