Automatic centering device for detecting compressive strength of concrete

Abstract

The utility model provides an automatic centering device for concrete compressive strength detection, which comprises a base, the top of the base is fixedly provided with vertical support rods in a rectangular array, a cleaning mechanism comprises a first motor, a translation screw rod, a movable sliding block and a longitudinal strip plate, and the back of a mounting block is provided with a back sliding chute. A translation screw rod is rotationally installed in the back sliding groove, a first motor is installed at one end of the translation screw rod, and the first motor is arranged close to the supporting plate; bristles and a scraping plate are arranged on the surface of the longitudinal strip plate, the side section of the scraping plate is triangular, and a containing cavity is formed in the longitudinal strip plate and used for receiving impurities scraped by the scraping plate; and a garbage can is hung at one end of the lower pressing block. When the device is used for detecting the compressive strength of the concrete test block, the centering arrangement of the test block can be quickly completed, repeated adjustment is not needed, and impurities at the upper pressing block can be quickly cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to concrete strength detection equipment technical field, concretely relates to a kind of automatic centering device for concrete compressive strength detection. BACKGROUND

[0002] When concrete test block carries out strength detection, pressure testing machine is often used, and pressure testing machine gradually increases the pressure by applying to concrete test block, until test block is crushed, the maximum pressure value is measured in this process, and then the compressive strength of concrete test block is calculated according to the pressure area of test block;Pressure testing machine is mainly composed of loading system, force measuring system and control system etc.Loaded system generally includes hydraulic jack etc., and can provide stable loading force;Force measuring system has pressure sensor etc., and can accurately measure pressure value;Control system is used to set loading speed and other parameters;

[0003] The pressure testing machine in prior art is as shown in Figure 7 This kind of traditional pressure testing machine has the following defects in actual use process:

[0004] 1.The concrete test block strength detection equipment lacks a positioning assembly for positioning the detection position of the concrete test block, and the worker needs to manually place the concrete test block and then repeatedly adjust the position, which increases the workload of the worker.

[0005] 2.During the strength detection of the concrete test block, when the concrete block is unqualified, the upper pressing block bottom is easy to have concrete block powder residue attached when the concrete is broken, so the worker needs to manually clean the powder residue attached to the upper pressing block bottom, and since the powder residue is attached to the upper pressing block bottom, it is inconvenient for the worker to observe, thus causing inconvenience to the worker. INVENTION CONTENTS

[0006] In view of the deficiencies of the prior art, the utility model provides an automatic centering device for concrete compressive strength detection, which solves the problems mentioned in the background art.

[0007] To achieve the above purpose, the utility model is realized by the following technical solutions:

[0008] The utility model provides an automatic centering device for concrete compressive strength detection, including the bottom, the top of bottom is fixedly installed with the support rod that is vertical in rectangular array, four support rods's top fixedly installed with the mounting plate, the mounting plate fixedly installed with the electric cylinder that is vertical, the piston rod of electric cylinder fixedly installed with the mounting block, the bottom of mounting block is equipped with pressure detection assembly, the bottom of pressure detection assembly is equipped with upper pressure block, the top of bottom and be located between four support rods's opposite side fixedly installed with the support block, the top of support block and be located upper pressure block's just below fixedly installed with lower pressure block, two support plates are installed on the two support rods, the bottom of support plate is fixedly installed with fixed block through screw, the fixed block is installed with the horizontal movement mechanism between the two support rods opposite sides and located in the fixed block direction, the end of movement mechanism close to lower pressure block and be located above lower pressure block installs the limit frame with the cross section presents the character of Han, movement mechanism is used for making limit frame close or far away along the direction of fixed block, the cleaning mechanism for acting on upper pressure block is installed on the mounting block, it is used for cleaning the bottom of upper pressure block,

[0009] The cleaning mechanism includes a first motor, a translation screw, a moving slider, and a longitudinal strip plate. The back of the mounting block is provided with a back sliding groove. The translation screw is rotatably installed in the back sliding groove. One end of the translation screw is provided with the first motor. The first motor is arranged close to the support plate. The translation screw is externally sleeved with the moving slider. The moving slider is slidingly embedded in the back sliding groove. The moving slider is externally provided with a second motor. One end of the longitudinal strip plate is provided with an end block. The top of the end block is provided with a swing plate. The swing plate is connected with the output end of the second motor. The second motor is used to drive the longitudinal strip plate to swing to one side.

[0010] The surface of the longitudinal strip plate is provided with bristles and a scraper. The side cross section of the scraper is triangular. The longitudinal strip plate is internally provided with a receiving cavity. The receiving cavity is used to receive the impurities scraped by the scraper. One end of the lower pressure block is hung with a garbage can. The garbage can is used to recycle the impurities at the upper pressure block and the lower pressure block.

[0011] Further, the pressure detection assembly includes spring telescopic rods and a pressure sensor. The bottom of the mounting block is provided with a mounting groove. Two spring telescopic rods are symmetrically fixed on the mounting block and located in the mounting groove. The upper pressure block is located in the mounting groove and fixedly connected with the bottoms of the two spring telescopic rods. The bottom of the upper pressure block extends below the mounting block. The mounting block is fixedly installed with the pressure sensor which is in contact with the upper pressure block and located in the mounting groove.

[0012] Further, the movement mechanism includes guide rods, a moving seat, a driving rod, and a motor. Two guide rods are movably and penetratively arranged on the fixed block in a horizontal direction. The moving seat is sleeved outside the fixed block and fixedly installed on the two guide rods. The driving rod is threadedly penetrated on the fixed block in a horizontal direction. The driving rod is rotatably connected with the moving seat. The motor for driving the driving rod to rotate is fixedly installed on the moving seat. The limit frame is fixedly installed on the end of the moving seat by screws.

[0013] Further, the support plate is detachably mounted on the two support rods through the positioning mechanism.

[0014] Further, the positioning mechanism comprises two groups of positioning units mounted at the two ends of the support plate respectively and connected with the two support rods respectively, the positioning unit comprises a positioning rod penetrating the support plate movably in a horizontal direction, a positioning frame is threadedly connected to the positioning rod and can be sleeved outside the support rod, one end of the positioning rod extends into the positioning frame and is fixed with a positioning block which can abut against the support rod, and a nut is threadedly connected to the positioning rod on the side of the support plate away from the positioning frame.

[0015] Further, a level is fixedly mounted on the support plate.

[0016] Further, the inner walls on the two sides of the limiting frame are inclined outwardly along the opening end thereof.

[0017] Further, a guide plate is fixedly mounted at each end of the limiting frame, and the two guide plates are away from each other along the end away from the limiting frame.

[0018] Further, the cleaning mechanism comprises a connecting plate slidingly mounted on one side of the mounting block, a cleaning brush is fixedly mounted on the bottom of the connecting plate and can abut against the bottom of the upper pressing block, a threaded rod is rotatably mounted on the mounting block and threadedly connected with the connecting plate, and a motor is fixedly mounted on the mounting block and connected with the threaded rod.

[0019] The utility model provides a kind of automatic centering device for concrete compressive strength detection.Compared with prior art, it has the following beneficial effects:

[0020] 1. When detecting the compressive strength of concrete test blocks, the compressive strength of multiple concrete test blocks of the same specification is detected, and the staff only needs to manually place the first concrete test block and measure to make the concrete test block at the center of the top of the lower pressing block, thereby reducing the workload of the staff and improving work efficiency.

[0021] 2. After the strength detection of the concrete test block is completed, the bottom of the upper pressing block is cleaned by the cleaning mechanism, which can clean the residual powder attached to the bottom of the upper pressing block, thereby eliminating the need for manual cleaning by the staff, which is more convenient.

[0022] 3. The support plate is detachably mounted on the two support rods through the positioning mechanism, which can be disassembled to facilitate the disassembly of the moving mechanism and the limiting frame, and facilitate the maintenance and replacement of the various components mounted on the support plate.

[0023] 4. By setting the two sides of the limiting frame inner wall is inclined along the opening end outward, increase the opening end width of the limiting frame, so as to facilitate the concrete test block is inserted into the limiting frame, facilitate to the concrete test block of strength detection is carried out on the material. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 The installation structure schematic diagram of the pressure detection assembly of the present application is shown;

[0026] Figure 2 The cleaning mechanism structure schematic diagram of the present application is shown;

[0027] Figure 3 The longitudinal strip plate cross section structure schematic diagram of the present application is shown;

[0028] Figure 4 The three-dimensional structure schematic diagram of the present application is shown;

[0029] Figure 5 The installation structure schematic diagram of the moving mechanism of the present application is shown;

[0030] Figure 6 The installation structure schematic diagram of the positioning mechanism of the present application is shown;

[0031] Figure 7 The structure schematic diagram of a concrete compressive strength detection equipment in prior art is shown;

[0032] As shown in the figure: 1, base; 11, support rod; 12, mounting plate; 13, electric cylinder; 14, mounting block; 141, mounting groove; 15, upper pressing block; 16, support block; 17, lower pressing block; 2, pressure detection assembly; 21, spring telescopic rod; 22, pressure sensor; 3, support plate; 31, fixed block; 32, level; 4, moving mechanism; 41, guide rod; 42, moving seat; 43, driving rod; 44, motor; 5, limiting frame; 51, guide plate; 6, positioning mechanism; 61, positioning rod; 62, positioning frame; 63, positioning block; 64, nut; 7, cleaning mechanism; 71, first motor, 72, translation screw, 73, moving slider, 74, second motor, 75, end block, 751, swing plate, 76, longitudinal strip plate, 761, brush, 762, scraper, 763, accommodating cavity, 141, back sliding groove, 8, garbage can. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the technical scheme in the embodiments of the utility model is described clearly and completely, obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0034] Embodiment one

[0035] In order to solve the technical problems in the background art, a kind of automatic centering device for concrete compressive strength detection is given as follows:

[0036] Combining Figures 1-6 As shown in the utility model provides a kind of automatic centering device for concrete compressive strength detection, including base 1, the top of base 1 is fixedly installed with the support rod 11 of vertical shape in rectangular matrix, the top of four support rods 11 is fixedly installed with mounting plate 12, mounting plate 12 is fixedly installed with the electric cylinder 13 of vertical shape, the piston rod of electric cylinder 13 is fixedly installed with mounting block 14, the bottom of mounting block 14 is installed with pressure detection assembly 2, the bottom of pressure detection assembly 2 is installed with upper pressing block 15, base 1 top and between the opposite sides of four support rods 11 Fixedly installed with support block 16, the top of support block 16 and below upper pressing block 15 Fixedly installed with lower pressing block 17;

[0037] Two of the support rod 11 are installed with support plate 3, and the bottom of the support plate 3 is fixedly installed with a fixed block 31 by a screw, and the fixed block 31 is installed with a horizontal moving mechanism 4 between the opposite sides of the two support rods 11, and the end of the moving mechanism 4 close to the lower pressing block 17 is installed with a limit frame 5 with a cross-section of a horizontal type above the lower pressing block 17, the moving mechanism 4 is used to make the limit frame 5 close to or away from the fixed block 31 direction, the mounting block 14 is installed with a cleaning mechanism 7 acting on the upper pressing block 15, which is used to clean the bottom of the upper pressing block 15, wherein, in this embodiment, a PLC control system is also provided, the moving mechanism 4, the electric cylinder 13 and the pressure detection assembly 2 are all in communication connection with the PLC control system, and the PLC control system is pre-set with detection pressure value information.

[0038] When the compressive strength of the concrete test block is detected, the worker first places the concrete test block on the top center of the lower pressing block 17, controls the moving mechanism 4 to move the limiting frame 5 away from the fixed block 31 through the PLC control system, so that the concrete test block is attached to the inner wall of the side of the limiting frame 5 close to the moving mechanism 4, records the position information of the limiting frame 5 through the PLC control system, calculates the moving stroke distance of the moving mechanism 4, and then controls the moving mechanism 4 to move the limiting frame 5 close to the fixed block 31 through the PLC control system, so that the limiting frame 5 is away from the concrete test block. At this time, the electric cylinder 13 is controlled to move the mounting block 14 downward, which drives the upper pressing block 15 to move downward. When the upper pressing block 15 contacts the concrete test block, the electric cylinder 13 moves the mounting block 14 downward, and the upper pressing block 15 applies an upward reverse force to the pressure detection assembly 2 under the action of the reverse force, so that the pressure detection assembly 2 changes the stress detection signal and transmits the detection signal to the PLC control system. When the pressure value detected by the pressure detection assembly 2 reaches the preset detection pressure value information, the electric cylinder 13 is controlled to reset the mounting block 14, so that the strength detection effect of the concrete test block can be realized. After the compressive strength of the concrete test block is detected, the concrete test block is discharged, and the compressive strength of the next concrete test block is detected. The concrete test block is inserted into the limiting frame 5, and the moving mechanism 4 is controlled to move the limiting frame 5 away from the fixed block 31 through the PLC control system according to the calculated moving stroke distance, so that the concrete test block can be placed on the top center of the lower pressing block 17. Therefore, when the compressive strength of multiple concrete test blocks of the same specification is detected, the worker only needs to manually place the first concrete test block and measure the concrete test block on the top center of the lower pressing block 17, thereby reducing the workload of the worker and improving the work efficiency. After the strength detection of the concrete test block is completed, the upper pressing block 15 is cleaned through the cleaning mechanism 7, so that the residual powder attached to the bottom of the upper pressing block 15 can be cleaned, thereby avoiding manual cleaning by the worker, which is more convenient.

[0039] Example two

[0040] As Figures 1-5 shown, on the basis of the above embodiment, the present embodiment further gives the following contents:

[0041] In this embodiment, the pressure detection assembly 2 includes a spring telescopic rod 21 and a pressure sensor 22, the pressure sensor 22 being model NS-P22; the bottom of the mounting block 14 has a mounting groove 141, and vertically oriented spring telescopic rods 21 are symmetrically fixed on the mounting block 14 and within the mounting groove 141; the upper pressure block 15 is located within the mounting groove 141 and is fixedly connected to the bottom of the two spring telescopic rods 21, the bottom of the upper pressure block 15 extending to the bottom of the mounting block 14, and fixed on the mounting block 14 and within the mounting groove 141. A pressure sensor 22 is installed that fits against the upper pressure block 15. In use, when the mounting block 14 is moved downward by the electric cylinder 13, the upper pressure block 15 applies an upward reverse force to the pressure detection component 2 under the reverse force. The two spring telescopic rods 21 deform under the force, and the upper pressure block 15 comes into contact with the pressure sensor 22, so that the pressure sensor 22 is subjected to force. The force detection signal of the pressure sensor 22 changes and is transmitted to the PLC control system to realize the effect of applying pressure value detection to the concrete test block.

[0042] In this embodiment, the moving mechanism 4 includes a guide rod 41, a moving seat 42, a driving rod 43, and a motor 44. Two guide rods 41 are horizontally movably inserted through the fixed block 31. A moving seat 42, sleeved on the outside of the fixed block 31, is fixedly installed on the two guide rods 41. A driving rod 43 is threaded through the fixed block 31 in a horizontal direction. The driving rod 43 is rotatably connected to the moving seat 42. A motor 44 for driving the driving rod 43 to rotate is fixedly installed on the moving seat 42. In use, when the limiting frame 5 moves closer to or further away from the fixed block 31 through the moving mechanism 4, the motor 44 is controlled to work, causing the driving rod 43 to rotate on the moving seat 42. At this time, the driving rod 43 moves spirally along the fixed block 31, thereby driving the moving seat 42 to move along the two guide rods 41, thus achieving the effect of driving the limiting frame 5 to move. The limiting frame 5 is fixedly installed at the end of the moving seat 42 by screws, which facilitates the disassembly and replacement of the limiting frame 5.

[0043] In this embodiment, the support plate 3 is detachably mounted on the two support rods 11 via the positioning mechanism 6. By setting the support plate 3 to be detachably mounted on the two support rods 11 via the positioning mechanism 6, the support plate 3 can be disassembled, which facilitates the disassembly of the moving mechanism 4 and the limiting frame 5, and facilitates the inspection and replacement of various components mounted on the support plate 3.

[0044] Example 3

[0045] like Figures 1-5 As shown, based on the above embodiments, this embodiment further provides the following:

[0046] In the embodiment, the positioning mechanism 6 comprises two groups of positioning units respectively installed at two ends of the support plate 3 and connected with the two support rods 11, each of the positioning units comprises a positioning rod 61 horizontally penetrating the support plate 3 movably, the positioning rod 61 is threadedly connected with a positioning frame 62 which can be sleeved outside the support rod 11, one end of the positioning rod 61 extends into the positioning frame 62 and is fixed with a positioning block 63 which can abut against the support rod 11, the positioning rod 61 is threadedly connected with a nut 64 on the side of the support plate 3 away from the positioning frame 62, during installation, the two positioning frames 62 are sleeved outside the two support rods 11 respectively, the positioning rod 61 is rotated to make the positioning block 63 approach the support rod 11, so that the positioning block 63 abuts against the support rod 11, thereby positioning the positioning frame 62 and the support rod 11, the nut 64 is rotated to displace towards the positioning frame 62, and the positioning frame 62 and the nut 64 abut against the support plate 3, thereby fixing the position of the support plate 3, facilitating installation, on the contrary, the nut 64 is reversely rotated, and the positioning rod 61 is reversely rotated to make the positioning block 63 away from the support rod 11, thereby canceling the positioning between the positioning frame 62 and the support rod 11, facilitating disassembly of the support plate 3.

[0047] In the embodiment, the support plate 3 is fixedly installed with a level 32, through the design of the level 32, the support plate 3 can be adjusted to be horizontal during installation.

[0048] In the embodiment, the two side inner walls of the limiting frame 5 are outwardly inclined along the opening end thereof, through the design that the two side inner walls of the limiting frame 5 are outwardly inclined along the opening end thereof, the opening end width of the limiting frame 5 is increased, thereby facilitating insertion of the concrete test block into the limiting frame 5 and facilitating feeding of the concrete test block to be tested.

[0049] In the embodiment, the limiting frame 5 is fixedly installed with guide plates 51 at two ends thereof, the two guide plates 51 are away from each other along the ends away from the limiting frame 5, through the design of the two guide plates 51, when the concrete test block is placed on the top of the pressing block 17 and pushed to be inserted into the limiting frame 5, the concrete test block is displaced along the guide plates 51 into the limiting frame 5 when the concrete test block contacts the guide plates 51, thereby further facilitating feeding of the concrete test block to be tested.

[0050] In the embodiment, the cleaning mechanism 7 comprises a first motor 71, a translation screw 72, a moving slider 73 and a longitudinal strip plate 76. The back of the mounting block is provided with a back sliding groove 141. The translation screw is rotatably arranged in the back sliding groove. The first motor is arranged at one end of the translation screw and close to the supporting plate. The moving slider is sleeved on the outside of the translation screw and slidably arranged in the back sliding groove. The second motor 74 is arranged on the outside of the moving slider. The longitudinal strip plate is provided with an end block 75 at one end. The top of the end block is provided with a swing plate 751. The swing plate is connected with the output end of the second motor. The second motor is used to drive the longitudinal strip plate to swing to one side. The surface of the longitudinal strip plate is provided with a brush 761 and a scraper 762. The side section of the scraper is triangular. The inside of the longitudinal strip plate is provided with a containing cavity 763. The containing cavity is used to receive the impurities scraped by the scraper. One end of the lower pressing block is hung with the garbage can 8.

[0051] The first motor drives the translation screw to rotate, thereby driving the moving slider to move along the back sliding groove. The longitudinal strip plate moves with the moving slider, so that the scraper scrapes the impurities and the brush assists in cleaning. The scraped impurities fall into the containing cavity. After one reciprocating movement, the longitudinal strip plate moves to the end far away from the supporting plate. Then the second motor drives the swing plate to rotate, thereby driving the longitudinal strip plate to rotate outward, so that the longitudinal strip plate is horizontally arranged on one side of the mounting block and the containing cavity is open downward. The impurities fall into the garbage can 8 placed in advance. In this way, the impurities are automatically poured out. At the same time, the longitudinal strip plate does not protrude from the mounting block. The bottom of the upper pressing block is flat, so as not to affect the pressing action of the upper pressing block.

[0052] The garbage can can receive the impurities falling from the containing cavity and the impurities cleaned at the lower pressing block.

[0053] It should be noted that, in the present document, the terms such as first and second, etc. are used merely to differentiate one entity or action from another, and do not necessarily require or imply any such actual relationship or order between such entities or actions. In addition, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0054] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An automatic centering device for testing the compressive strength of concrete, characterized in that: The system includes a base, on the top of which are vertically mounted support rods arranged in a rectangular array. A mounting plate is fixedly mounted on the top of each of the four support rods, and a vertically mounted electric cylinder is fixedly mounted on the mounting plate. A mounting block is fixedly mounted on the piston rod of the electric cylinder. A pressure detection component is mounted on the bottom of the mounting block, and an upper pressure block is mounted on the bottom of the pressure detection component. A support block is fixedly mounted on the top of the base, between opposite sides of the four support rods. A lower pressure block is fixedly mounted on the top of the support block, directly below the upper pressure block. Support plates are mounted on two of the support rods, and a fixing block is fixedly mounted on the bottom of the support plates by screws. A horizontally moving mechanism is mounted on the fixing block, between opposite sides of the two support rods. A U-shaped limit frame is mounted on the end of the moving mechanism near the lower pressure block, above the lower pressure block. The moving mechanism is used to move the limit frame closer to or away from the fixing block. A cleaning mechanism acting on the upper pressure block is mounted on the mounting block for cleaning the bottom of the upper pressure block. The cleaning mechanism includes a first motor, a translation screw, a movable slider, and a longitudinal bar plate. A back slide groove is provided on the back of the mounting block. The translation screw is rotatably installed inside the back slide groove. The first motor is installed at one end of the translation screw and is located close to the support plate. A movable slider is fitted on the outside of the translation screw and slides into the back slide groove. A second motor is provided on the outside of the movable slider. An end block is provided at one end of the longitudinal bar plate. A swing plate is provided on the top of the end block. The swing plate is connected to the output end of the second motor. The second motor is used to drive the longitudinal bar plate to swing to one side. The surface of the longitudinal strip is provided with bristles and a scraper. The scraper has a triangular cross-section. The interior of the longitudinal strip has a receiving cavity to receive the impurities scraped off by the scraper. A trash can is hung at one end of the lower pressing block to collect the impurities from the upper and lower pressing blocks.

2. The automatic centering device for testing the compressive strength of concrete according to claim 1, characterized in that: The pressure detection assembly includes a spring telescopic rod and a pressure sensor; the bottom of the mounting block has a mounting groove, and vertical spring telescopic rods are symmetrically fixed on the mounting block and located in the mounting groove. The upper pressure block is located in the mounting groove and is fixedly connected to the bottom of the two spring telescopic rods. The bottom of the upper pressure block extends to the bottom of the mounting block. A pressure sensor that fits against the upper pressure block is fixedly installed on the mounting block and located in the mounting groove.

3. The automatic centering device for testing the compressive strength of concrete according to claim 1, characterized in that: The moving mechanism includes a guide rod, a moving seat, a driving rod, and a motor. Two guide rods are horizontally movably inserted through the fixed block. A moving seat, sleeved on the outside of the fixed block, is fixedly installed on the two guide rods. A driving rod is threaded through the fixed block in a horizontal direction and is rotatably connected to the moving seat. A motor for driving the driving rod to rotate is fixedly installed on the moving seat. A limit frame is fixedly installed at the end of the moving seat by screws.

4. The automatic centering device for testing the compressive strength of concrete according to claim 1, characterized in that: The support plate is detachably mounted on two support rods via a positioning mechanism.

5. An automatic centering device for testing the compressive strength of concrete according to claim 4, characterized in that: The positioning mechanism includes two sets of positioning units respectively installed at both ends of the support plate and connected to two support rods. Each positioning unit includes a positioning rod that is horizontal and moves through the support plate. A positioning frame that can be sleeved on the outside of the support rod is threaded onto the positioning rod. One end of the positioning rod extends into the positioning frame and is fixed with a positioning block that can abut against the support rod. A nut is threaded onto the positioning rod on the side of the support plate away from the positioning frame.

6. The automatic centering device for testing the compressive strength of concrete according to claim 1, characterized in that: A spirit level is fixedly installed on the support plate.

7. The automatic centering device for testing the compressive strength of concrete according to claim 1, characterized in that: The inner walls on both sides of the limiting frame are inclined outward along their opening ends.

8. An automatic centering device for testing the compressive strength of concrete according to claim 7, characterized in that: Guide plates are fixedly installed at both ends of the limiting frame, and the two guide plates are far apart from each other along the end away from the limiting frame.

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