Pressure resistance detection device for foam concrete
By designing a coordinated energy storage mechanism, a one-way transmission mechanism, and a drive mechanism, the automatic cleaning of the foamed concrete compressive strength testing device was achieved, solving the problem of tedious surface cleaning of the pressure plate and improving the accuracy and repeatability of the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-13
- Publication Date
- 2026-04-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In existing foamed concrete compressive strength testing, cleaning the surface of the pressure plate is cumbersome and difficult to keep clean, which affects the accuracy and repeatability of the test results.
A device for testing the compressive strength of foamed concrete was designed. It employs the coordinated operation of an energy storage mechanism, a unidirectional transmission mechanism, and a drive mechanism to achieve automatic reciprocating cleaning of the scraper at the bottom of the pressure plate, thus avoiding concrete residue.
By automatically cleaning concrete debris from the bottom of the pressure plate, the stability of the test and the reliability of the test results are improved, ensuring test accuracy and repeatability.
Smart Images
Figure CN121804997A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of concrete testing, and particularly relates to a compressive resistance detection device for foam concrete. BACKGROUND
[0002] As a typical porous material, the internal pore structure, pore size distribution and pore stability of foam concrete directly affect the compressive strength, durability and engineering applicability of the material. In actual engineering application and quality detection process, the mechanical properties of foam concrete are usually detected through compression test, loading deformation test and other methods to indirectly reflect the internal particle structure and pore characteristics.
[0003] The existing compressive resistance detection of foam concrete usually uses a pressure testing machine to load the test block, and the material performance is evaluated by recording the pressure change in the loading process. However, during multiple tests, a large amount of fine particles or debris will be generated when the foam concrete is compressed and damaged. These particles are easily attached to the surface of the pressure plate, forming an irregular accumulation layer, which changes the pressure transmission path, affects the true reflection of the particle stress state and pore structure, and further leads to test result deviation.
[0004] Especially when analyzing the pore stability, particle crushing behavior and compression response characteristics of porous materials, the cleanliness of the pressure loading surface has an important influence on the consistency of the particle stress. In the prior art, the surface of the pressure plate is usually cleaned manually or by stopping the machine, which is complicated to operate and difficult to maintain the consistency of the pressure plate surface during continuous detection, affecting the accuracy and repeatability of the particle characteristics and pore structure test.
[0005] Therefore, the present application provides a compressive resistance detection device for foam concrete to solve the above problems in the prior art. SUMMARY
[0006] The present application provides a compressive resistance detection device for foam concrete to solve the above problems in the prior art.
[0007] To achieve the above object, the present application adopts the following technical scheme: A compressive resistance detection device for foam concrete, comprising a cabinet provided with a pressure testing machine, wherein the pressure testing machine is installed with a pressure plate, one end of the pressure plate is provided with a reciprocating lead screw, a reciprocating sliding block is arranged on the reciprocating lead screw, an L-shaped mounting plate is welded on the outer wall of the reciprocating sliding block, an installation groove is formed in the L-shaped mounting plate, a scraper is arranged in the installation groove, the top end of the scraper is in close contact with the bottom outer wall of the pressure plate 2, a driving mechanism is arranged at one end of the reciprocating lead screw, an energy storage mechanism is arranged on the driving mechanism, and a one-way transmission mechanism is arranged between the energy storage mechanism and the driving mechanism.
[0008] Further, the energy storage mechanism comprises an energy storage cylinder mounted on the outer wall of the pressure plate, and an opening is arranged on one side of the energy storage cylinder, a rotating disc is rotatably connected to the inner wall of the opening of the energy storage cylinder, and an energy storage shaft is rotatably connected to the middle of the rotating disc, an energy storage torsion spring is arranged in the energy storage cylinder, and a torsion spring clamping plate is fixedly connected to the inner wall of the energy storage cylinder, and the torsion spring clamping plate cooperates with the energy storage shaft to clamp and fix one end of the energy storage torsion spring.
[0009] Further, a plurality of driving plates are fixedly connected to the outer wall of the energy storage shaft at equal distances, and a mounting bracket is arranged on the outer part of the energy storage shaft, a rotating shaft is rotatably connected to the inner wall of the mounting bracket, and a second servo motor is arranged on the top end of the rotating shaft, a plurality of semicircular discs are fixedly connected to the outer wall of the rotating shaft at equal distances, and the semicircular discs are arranged alternately with the driving plates and form cooperation.
[0010] Further, the driving mechanism comprises a driving shaft mounted on the outer wall of the pressure plate, and a bevel gear one is fixedly connected to one end of the driving shaft, a bevel gear two is engaged with the outer wall of the bevel gear one, and the bevel gear two is fixedly connected to the outer wall of one side of the reciprocating screw rod.
[0011] Further, the one-way transmission mechanism comprises a convex plate fixedly connected to the outer wall of the other end of the driving shaft, and a one-way driving cylinder rotatably connected to the outer wall of the driving shaft is arranged on the outer part of the convex plate, a slot is formed in the inner wall of the one-way driving cylinder, a cooperation plate is hingedly connected to the inside of the slot, and a hook spring is hingedly connected between the cooperation plate and the inner wall of the slot.
[0012] Further, a stepped groove is formed in the outer wall of one side of the bottom of the pressure plate 2, and a threaded rod is arranged on one side of the stepped groove, a first servo motor is arranged on one end of the threaded rod, a threaded sliding block is threadedly and slidably connected to the outer wall of the threaded rod, and an L-shaped pushing rod is fixedly connected to the outer wall of the bottom of the threaded sliding block.
[0013] Further, two slide rods are slidably connected to one side of the mounting groove close to the stepped groove, and the outer wall of each of the two slide rods is fixedly connected to the outer wall of the scraper, and the other end of each of the two slide rods is fixedly connected to a pressing plate.
[0014] Further, a connecting spring is fixedly connected between the outer wall of the pressing plate and the L-shaped mounting plate, the connecting spring is sleeved on the corresponding slide rod, and a plurality of arc-shaped protrusions are fixedly connected to the outer wall of the pressing plate at equal distances.
[0015] The beneficial effects of the present application are: Through the cooperation of the energy storage mechanism, the one-way transmission mechanism and the driving mechanism, the automatic reciprocating cleaning and self-vibration scrap removal of the scraper at the bottom of the pressure plate are realized, the detection accuracy is avoided from being affected by the residual concrete, and the detection stability and the reliability of the test results are improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1It is a structural schematic view of a kind of compressive strength detection device of foam concrete; Figure 2 It is a pressure plate and mounting bracket cooperation structural schematic view of a kind of compressive strength detection device of foam concrete; Figure 3 It is a pressure plate structural schematic view of a kind of compressive strength detection device of foam concrete; Figure 4 It is a mounting bracket structural schematic view of a kind of compressive strength detection device of foam concrete; Figure 5 It is a drive shaft structural schematic view of a kind of compressive strength detection device of foam concrete; Figure 6 It is a inside structure schematic view of a kind of compressive strength detection device of foam concrete; Figure 7 It is a one-way drive cylinder section structural schematic view of a kind of compressive strength detection device of foam concrete; Figure 8 It is a L-shaped mounting plate structural schematic view of a kind of compressive strength detection device of foam concrete.
[0017] In the figure: 1, cabinet;2, pressure plate;3, pressure testing machine;4, mounting bracket;5, threaded rod;6, L-shaped push rod;7, threaded slide block;8, servo motor one;9, drive shaft;10, bevel gear one;11, bevel gear two;12, L-shaped mounting plate;13, reciprocating slide block;14, reciprocating screw;15, rotating shaft;16, semicircular disc;17, servo motor two;18, rotating disc;19, energy storage cylinder;20, energy storage shaft;21, drive plate;22, one-way drive cylinder;23, torsional spring clamping plate;24, energy storage torsional spring;25, slot;26, hook spring;27, cooperation plate;28, convex plate;29, scraper;30, arc convex block;31, pressing plate;32, connecting spring;33, slide bar. DETAILED DESCRIPTION
[0018] The technical solutions of the application are further described in detail below in combination with specific embodiments.
[0019] REFERENCE Figure 1 、 Figure 3As shown in, a kind of compressive strength detection device of foam concrete, including the cabinet 1 being provided with pressure testing machine 3, pressure testing machine 3 is installed with pressure plate 2, one end of pressure plate 2 is provided with reciprocating screw rod 14, and reciprocating screw rod 14 is provided with reciprocating sliding block 13, L-shaped mounting plate 12 is welded on the outer wall of reciprocating sliding block 13, and installation groove is formed in L-shaped mounting plate 12, and scraper 29 is arranged in installation groove, and the top of scraper 29 is tightly attached to the bottom outer wall of pressure plate 2, one end of reciprocating screw rod 14 is provided with driving mechanism, and energy storage mechanism is provided on driving mechanism, and one-way transmission mechanism is provided between energy storage mechanism and driving mechanism, after foam concrete test block is placed at the right below of pressure plate 2, start pressure testing machine 3, make pressure plate 2 move downwards, and the pressure of foam concrete test block is applied to complete the compression performance test, and the pressure data generated in the test process is recorded in real time, to judge whether the compression performance of foam concrete test block meets the standard or not; And in the process that pressure plate 2 moves downwards and carries out compression test, energy storage mechanism carries out energy storage simultaneously, under the action of one-way transmission mechanism, energy storage mechanism will not drive reciprocating screw rod 14 to rotate through driving mechanism in energy storage stage, so as to avoid that scraper 29 generates interference in test stage; And in the process that pressure plate 2 moves upwards after test is completed, energy storage mechanism starts to release the elastic potential energy stored, and through the cooperation with one-way transmission mechanism, reciprocating screw rod 14 is driven to rotate through driving mechanism, so that reciprocating sliding block 13 moves along the axial direction of reciprocating screw rod 14, and then drives scraper 29 in L-shaped mounting plate 12 to make reciprocating scraping movement on the bottom outer wall of pressure plate 2, so as to clean the concrete debris attached to the bottom of pressure plate 2.Through the above-mentioned reciprocating cycle, the clean state of the bottom outer wall of pressure plate 2 can be continuously maintained, to avoid that residual concrete debris influences the precision of subsequent compression test.
[0020] Referring to Figure 5 、 Figure 6 As further scheme in the present application, as shown in, energy storage mechanism includes energy storage cylinder 19 installed on the outer wall of pressure plate 2, and the one side of energy storage cylinder 19 is provided with opening, rotating disc 18 is rotatably connected to the inner wall of opening of energy storage cylinder 19, energy storage shaft 20 is rotatably connected to the middle part of rotating disc 18, energy storage torsional spring 24 is arranged in energy storage cylinder 19, and torsional spring clamping plate 23 is fixedly connected to the inner wall of energy storage cylinder 19, and torsional spring clamping plate 23 cooperates with energy storage shaft 20 to clamp and fix one end of energy storage torsional spring 24.
[0021] Referring to Figure 2 、 Figure 5As further shown in the drawings, as a further scheme of the present application, the energy storage shaft 20 is fixedly connected with a plurality of driving plates 21 at equal intervals on the outer wall, and the energy storage shaft 20 is provided with a mounting frame 4 on the outside, the inner wall of the mounting frame 4 is rotatably connected with a rotating shaft 15, and the top end of the rotating shaft 15 is provided with a servo motor 2, the outer wall of the rotating shaft 15 is fixedly connected with a plurality of semicircular plates 16 at equal intervals, and the semicircular plates 16 are staggered with the driving plates 21 and form a cooperation, because the plurality of driving plates 21 on the energy storage shaft 20 are staggered with the plurality of semicircular plates 16 on the outer wall of the rotating shaft 15 and form a cooperation, when the pressure plate 2 moves downward, the energy storage shaft 20 can rotate forward, and because the torsional spring clamp plate 23 cooperates with the energy storage shaft 20 to clamp and fix one end of the energy storage torsional spring 24 inside the energy storage cylinder 19, when the energy storage shaft 20 rotates, it can make the energy storage torsional spring 24 elastically deform, thereby storing elastic potential energy, because the semicircular plates 16 are staggered with the driving plates 21 and form a cooperation, thereby the energy storage shaft 20 can be blocked from reversing under the action of the elastic potential energy; When the pressure plate 2 moves upward, the servo motor 2 will be started synchronously, the servo motor 2 rotates the plurality of semicircular plates 16 through the rotating shaft 15, so that the semicircular plates 16 are arranged with the driving plates 21, thereby the plurality of driving plates 21 are located in the gaps of the semicircular plates 16, at this time, the semicircular plates 16 do not block the driving plates 21, thereby under the action of the elastic potential energy stored by the energy storage torsional spring 24, the energy storage shaft 20 can be reversed.
[0022] Referring to Figure 3 , Figure 5 As a further scheme of the present application, the driving mechanism includes a driving shaft 9 mounted on the outer wall of the pressure plate 2, and the one end of the driving shaft 9 is fixedly connected with a bevel gear 1, the outer wall of the bevel gear 1 is engaged with a bevel gear 2, and the bevel gear 2 is fixedly connected with the outer wall of one side of the reciprocating screw rod 14, the energy storage mechanism can rotate the driving shaft 9 through the one-way transmission mechanism, and the driving shaft 9 can rotate the reciprocating screw rod 14 through the engaged bevel gear 1 and bevel gear 2, thereby moving the reciprocating sliding block 13.
[0023] Referring to Figure 5 , Figure 7 As a further scheme of the present application, the one-way transmission mechanism includes a lug plate 28 fixedly connected to the outer wall of the other end of the driving shaft 9, and the outer wall of the lug plate 28 is provided with a one-way drive cylinder 22 rotatably connected to the outer wall of the driving shaft 9, the inner wall of the one-way drive cylinder 22 is provided with a gap 25, and the inside of the gap 25 is hingedly connected with a cooperation plate 27, and the hinge between the cooperation plate 27 and the inner wall of the gap 25 is provided with a hook spring 26, when the energy storage shaft 20 rotates forward, it can drive the one-way drive cylinder 22 to rotate forward synchronously, at this time, the lug plate 28 on the outer wall of the driving shaft 9 can apply force to the cooperation plate 27, so that the cooperation plate 27 compresses the hook spring 26 to move into the gap 25, thereby the energy storage shaft 20 does not rotate the driving shaft 9 when it rotates forward synchronously with the one-way drive cylinder 22. When the energy storage shaft 20 reverses under the action of the elastic potential energy stored in the energy storage torsion spring 24, the protruding plate 28 on the outer wall of the drive shaft 9 will also apply force to the matching plate 27, but the inner wall of the side of the missing slot 25 will block the matching plate 27, so that one end of the matching plate 27 always points to the axis of the one-way drive cylinder 22, and the matching plate 27 cooperates with the protruding plate 28 on the outer wall of the drive shaft 9, so that the energy storage shaft 20 reverses synchronously with the one-way drive cylinder 22, which will make the drive shaft 9 rotate.
[0024] Working principle: When the compressive resistance of the foam concrete is detected, the foam concrete test block is placed directly below the pressure plate 2, the pressure testing machine 3 is started, the pressure plate 2 moves downward along the vertical direction, the test block is subjected to gradually increasing pressure, and the compressive resistance test is completed, the pressure value generated during the test is collected in real time, and whether the compressive resistance of the foam concrete test block meets the requirements is judged; During the downward movement of the pressure plate 2, the energy storage mechanism installed on the outer wall of the pressure plate 2 synchronously participates in the movement, and as the pressure plate 2 moves downward, the energy storage shaft 20 rotates forward under the action of the drive plate 21 and the staggered cooperation of the semicircular disc 16, and since one end of the energy storage shaft 20 is fixed and clamped to the energy storage torsion spring 24 through the torsion spring clamp plate 23, the rotation of the energy storage shaft 20 will force the energy storage torsion spring 24 to deform elastically, thereby converting the mechanical energy generated during the downward movement of the pressure plate 2 into elastic potential energy and storing it in the energy storage torsion spring 24; During the energy storage process, the one-way transmission mechanism plays an isolation role, and since the one-way drive cylinder 22 and the drive shaft 9 form a one-way transmission relationship through the protruding plate 28, the matching plate 27 and the hook spring 26, when the energy storage shaft 20 rotates forward, the one-way drive cylinder 22 rotates with it, but the matching plate 27 is pressed into the missing slot 25 under the action of the protruding plate 28, so that the one-way drive cylinder 22 cannot drive the drive shaft 9 to rotate, thereby avoiding the mis-triggering of the drive mechanism during the compressive resistance test, ensuring the stability of the downward movement of the pressure plate 2 and the reliability of the test data; When the compressive resistance test is completed, the pressure testing machine 3 drives the pressure plate 2 to return upward, at this time the servo motor 2 17 is started synchronously, the plurality of semicircular discs 16 are driven to rotate through the rotating shaft 15, the notch of the semicircular disc 16 is aligned with the drive plate 21 on the outer wall of the energy storage shaft 20, thereby removing the blockage of the reverse rotation of the energy storage shaft 20, and under the action of the release of the elastic potential energy of the energy storage torsion spring 24, the energy storage shaft 20 begins to rotate reversely; When the energy storage shaft 20 reverses, the transmission state is changed through the one-way transmission mechanism, at this time the protruding plate 28 pushes the matching plate 27 to form effective meshing with the drive shaft 9, so that the one-way drive cylinder 22 can transmit the reverse rotation force to the drive shaft 9, thereby the drive shaft 9 begins to rotate, and the rotation of the drive shaft 9 is transmitted through the meshing of the bevel gear one 10 and the bevel gear two 11, so that the reciprocating wire rod 14 rotates synchronously; As the reciprocating screw 14 rotates, the reciprocating slider 13 on its outer wall moves in a reciprocating linear motion along the axial direction, thereby driving the L-shaped mounting plate 12 welded to its outer wall to move as a whole, so that the scraper 29 in the mounting groove reciprocates to scrape the bottom outer wall of the pressure plate 2, and cleans away the concrete debris attached to the bottom of the pressure plate 2 during the compressive strength test in a timely manner. Through the coordinated operation of the energy storage mechanism storing energy during the downward pressure phase, the unidirectional transmission mechanism switching transmission states at different motion phases, and the drive mechanism releasing energy and performing cleaning actions during the return phase, the pressure test and the automatic cleaning of the bottom of the pressure plate 2 are organically combined, ensuring that the bottom of the pressure plate 2 is always clean and avoiding the impact of residual concrete debris on the accuracy of subsequent tests, thereby significantly improving the accuracy and repeatability of the test results.
[0025] Reference Figure 3 As shown, as a further embodiment of the present invention, a stepped groove is provided on one side of the outer wall of the bottom of the pressure plate 2, and a threaded rod 5 is provided on one side of the stepped groove. A servo motor 8 is provided at one end of the threaded rod 5, and a threaded slider 7 is threadedly slidably connected to the outer wall of the threaded rod 5. An L-shaped push rod 6 is fixedly connected to the bottom outer wall of the threaded slider 7. When the scraper 29 on the L-shaped mounting plate 12 scrapes the concrete debris at the bottom of the pressure plate 2 clean and moves it into the stepped groove, the servo motor 8 will start. The servo motor 8 drives the threaded rod 5 to rotate forward and backward, thereby causing the threaded slider 7 on its outer wall to move back and forth with the L-shaped push rod 6.
[0026] Reference Figure 3 , Figure 8 As shown, as a further embodiment of the present invention, two sliding rods 33 are slidably connected to the side of the mounting groove near the stepped groove, and one end of each sliding rod 33 is fixedly connected to the outer wall of the scraper 29, and the other end of each sliding rod 33 is fixedly connected to a pressing plate 31.
[0027] Reference Figure 8 As shown, as a further embodiment of the present invention, a connecting spring 32 is fixedly connected between the pressing plate 31 and the outer wall of the L-shaped mounting plate 12, and the connecting spring 32 is sleeved on the corresponding sliding rod 33. Multiple arc-shaped protrusions 30 are fixedly connected at equal intervals on the outer wall of the pressing plate 31 facing the stepped groove. During the reciprocating movement of the L-shaped push rod 6, one end of the L-shaped push rod 6 will intermittently contact the multiple arc-shaped protrusions 30 on the pressing plate 31, causing the scraper 29 on the sliding rod 33 to reciprocate in the mounting groove. Under the action of the connecting spring 32, the scraper 29 can be continuously vibrated, thereby shaking off the concrete debris remaining on the scraper 29 and preventing concrete debris from remaining on the scraper 29.
[0028] Working principle: After the scraper 29 completes the scraping action on the bottom outer wall of the pressure plate 2 and moves to the stepped groove area, the servo motor 8 starts. The servo motor 8 rotates in the forward and reverse directions of the threaded rod 5, causing the threaded slider 7 to move back and forth along the axial direction of the threaded rod 5, thereby driving the L-shaped push rod 6 fixedly connected to it to perform reciprocating linear motion. During the reciprocating motion of the L-shaped push rod 6, its end intermittently contacts multiple arc-shaped protrusions 30 arranged at equal intervals on the outer wall of the pressing plate 31. When in contact, a pushing force is applied to the pressing plate 31, causing the pressing plate 31 to move along the direction of the slide rod 33, and driving the scraper 29 fixedly connected to the other end of the slide rod 33 to reciprocate within the mounting groove of the L-shaped mounting plate 12. Meanwhile, under the elastic action of the connecting spring 32, the pressing plate 31 and the sliding rod 33 generate continuous vibration during the process of being subjected to force and resetting, so that the scraper 29 forms high-frequency vibration while reciprocating, thereby effectively shaking off the concrete debris attached to the surface of the scraper 29, avoiding the accumulation of debris from affecting the subsequent scraping effect, and ensuring that the scraper 29 always has good cleaning ability.
[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A device for testing the compressive strength of foamed concrete, comprising a cabinet (1) equipped with a pressure testing machine (3), wherein a pressure plate (2) is mounted on the pressure testing machine (3), characterized in that, One end of the pressure plate (2) is provided with a reciprocating screw (14), and a reciprocating slider (13) is provided on the reciprocating screw (14). An L-shaped mounting plate (12) is welded on the outer wall of the reciprocating slider (13), and an mounting groove is provided on the L-shaped mounting plate (12). A scraper (29) is provided inside the mounting groove, and the top of the scraper (29) is in close contact with the bottom outer wall of the pressure plate (2). One end of the reciprocating screw (14) is provided with a driving mechanism, and an energy storage mechanism is provided on the driving mechanism. A one-way transmission mechanism is provided between the energy storage mechanism and the driving mechanism.
2. The compressive strength testing device for foamed concrete according to claim 1, characterized in that, The energy storage mechanism includes an energy storage cylinder (19) installed on the outer wall of the pressure plate (2), and an opening is provided on one side of the energy storage cylinder (19). A rotating disk (18) is rotatably connected to the inner wall of the opening of the energy storage cylinder (19), and an energy storage shaft (20) is rotatably connected to the middle of the rotating disk (18). An energy storage torsion spring (24) is provided in the energy storage cylinder (19), and a torsion spring clamp (23) is fixedly connected to the inner wall of the energy storage cylinder (19). The torsion spring clamp (23) cooperates with the energy storage shaft (20) to clamp and fix one end of the energy storage torsion spring (24).
3. The compressive strength testing device for foamed concrete according to claim 2, characterized in that, Multiple drive plates (21) are fixedly connected at equal intervals on the outer wall of the energy storage shaft (20), and a mounting frame (4) is provided on the outside of the energy storage shaft (20). A rotating shaft (15) is rotatably connected to the inner wall of the mounting frame (4), and a servo motor (17) is provided at the top of the rotating shaft (15). Multiple semi-circular disks (16) are fixedly connected at equal intervals on the outer wall of the rotating shaft (15), and the semi-circular disks (16) and the drive plates (21) are staggered and cooperate with each other.
4. The compressive strength testing device for foamed concrete according to claim 1, characterized in that, The driving mechanism includes a drive shaft (9) mounted on the outer wall of the pressure plate (2), and a bevel gear (10) is fixedly connected to one end of the drive shaft (9). A bevel gear (11) meshes with the outer wall of the bevel gear (10), and the bevel gear (11) is fixedly connected to the outer wall of one side of the reciprocating screw (14).
5. The compressive strength testing device for foamed concrete according to claim 4, characterized in that, The one-way transmission mechanism includes a protruding plate (28) fixedly connected to the outer wall of the other end of the drive shaft (9), and a one-way drive cylinder (22) rotatably connected to the outer wall of the drive shaft (9) is provided outside the protruding plate (28). The inner wall of the one-way drive cylinder (22) is provided with a notch (25), and a mating plate (27) is hinged inside the notch (25). A hook spring (26) is hinged between the mating plate (27) and the inner wall of the notch (25).
6. The compressive strength testing device for foamed concrete according to claim 1, characterized in that, The pressure plate (2) has a stepped groove on one side of its outer wall, and a threaded rod (5) is provided on one side of the stepped groove. A servo motor (8) is provided at one end of the threaded rod (5), and a threaded slider (7) is threadedly connected to the outer wall of the threaded rod (5). An L-shaped push rod (6) is fixedly connected to the bottom outer wall of the threaded slider (7).
7. The compressive strength testing device for foamed concrete according to claim 6, characterized in that, Two sliding rods (33) are slidably connected to the side of the mounting groove near the stepped groove, and one end of each sliding rod (33) is fixedly connected to the outer wall of the scraper (29), and the other end of each sliding rod (33) is fixedly connected to a pressing plate (31).
8. The compressive strength testing device for foamed concrete according to claim 7, characterized in that, A connecting spring (32) is fixedly connected between the pressing plate (31) and the outer wall of the L-shaped mounting plate (12), and the connecting spring (32) is sleeved on the corresponding slide rod (33). Multiple arc-shaped protrusions (30) are fixedly connected at equal intervals on the outer wall of the pressing plate (31) facing the stepped groove.