A concrete strength detection device for house building construction

Abstract

The application discloses a kind of concrete strength detection devices for house construction, belong to concrete strength detection equipment technical field, it includes device ontology, support plate and support plate are provided on device ontology, pressing plate is driven to move down and extrude test block on support plate to realize detection, support frame is provided on device ontology, centering mechanism is installed on support frame, centering mechanism is driven by four directions extrusion test block to realize the centering of test block, and centering mechanism has a blocking state that can surround test block;The concrete strength detection device provided in the application has a blocking state that can completely surround the test block by the centering mechanism, blocks the concrete fragments by the cooperation state of the two, so that the fragments do not hit the observation window when they break and fly, and can also constrain the flying concrete fragments, limit the fragments to fly everywhere, and facilitate cleaning.

Description

Technical Field

[0001] This invention relates to the field of concrete strength testing equipment technology, and specifically discloses a concrete strength testing device for building construction. Background Technology

[0002] Concrete is the core material for building construction. Its strength performance directly determines the stability, load-bearing capacity, and service life of the main building structure. It is a core testing indicator for project quality acceptance, construction process progress, and final acceptance. Currently, concrete strength testing in the building construction field is mainly divided into two categories: destructive testing and non-destructive testing. The mainstream testing methods include the test block compressive strength test, core drilling method, rebound method, and ultrasonic testing method. Corresponding testing equipment is widely used on construction sites. Among them, the test block test requires on-site sampling to make standard test blocks, which are then cured according to standards and tested for compressive strength using a pressure testing machine. This is the traditional and conventional testing method.

[0003] For example, patent CN120063895B, published on July 11, 2025, discloses a concrete strength testing device for building construction, belonging to the field of concrete strength testing technology. The device includes a support assembly, which comprises a support frame with a top plate. The four corners of the support frame are connected to the top plate via columns. The support frame has abutment grooves, and a protective frame is slidably mounted on the columns, engaging with the abutment grooves. A positioning assembly for fixing concrete specimens is provided between the support frame and the protective frame. A lifting plate located inside the protective frame is slidably mounted on the columns. A pressure sensor is located on the side of the lifting plate closest to the support frame, and a hydraulic cylinder connected to the top plate is located on the other side of the lifting plate. A movable connecting assembly is provided between the protective frame and the lifting plate. This device has the advantages of automatic centering positioning, safety protection, flexible linkage, stable pressure application, effective detection, reliable structure, and convenient operation.

[0004] The shortcomings of existing concrete strength testing devices, including the aforementioned patent, are that their centering mechanism passively centers the test block by lowering the protective frame. During the testing process, the abutment plate of the centering mechanism is always in contact with the surface of the test block and has a certain clamping force, which will exert lateral constraint on the specimen. This will cause the expansion of the test block to be hindered when it is compressed, resulting in a higher compressive strength. Furthermore, at the moment the test block breaks, the flying fragments are likely to hit the observation window and damage it. Summary of the Invention

[0005] The purpose of this invention is to provide a concrete strength testing device for building construction.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A concrete strength testing device for building construction includes a device body, a pressure plate and a support plate on the device body. The pressure plate is driven to move downward and press a test block on the support plate to achieve testing. A support frame is provided on the device body, and a centering mechanism is installed on the support frame. The centering mechanism is driven to press the test block from four directions to achieve centering of the test block, and the centering mechanism has a blocking state that can surround the test block.

[0008] The above-mentioned detection device includes a centering mechanism comprising a first centering plate symmetrically arranged on the left and right sides of the support frame and a second centering plate arranged on the front and rear sides of the support frame. Each first centering plate has a right-angle baffle symmetrically arranged on both sides. The support frame is provided with a first driving member and a second driving member. The first driving member is used to drive each first centering plate to move, and the second driving member is used to drive each second centering plate to move.

[0009] In the aforementioned detection device, each baffle is movably mounted on a support frame, and the baffle is driven to move along the length of the device body.

[0010] In the aforementioned testing device, while the first driving member drives the first centering plate to center the test block, it also drives the baffle to move to the blocking position. When the first driving member drives the first centering plate to retract to the blocking position, the baffle remains in the blocking position.

[0011] The aforementioned detection device includes a first driving component comprising a fixed cylinder fixedly connected to a support frame, a first cylinder slidably installed inside the fixed cylinder, baffles on both sides of the first centering plate being fixedly connected to the first cylinder, a second cylinder slidably installed inside the first cylinder, the first centering plate being connected to the second cylinder via a connector, an air inlet provided on the fixed cylinder, and a locking component for locking the first cylinder provided inside the fixed cylinder.

[0012] The aforementioned testing device has a support frame movably mounted on the device body, and the support frame is driven to vertically raise and lower the centering mechanism.

[0013] The aforementioned detection device includes a locking component comprising a limiting pin slidably mounted on a fixed cylinder, a limiting ring groove that mates with the limiting pin on the outer wall of the first cylinder, and a first spring that maintains the relative position of the limiting pin and the fixed cylinder on the fixed cylinder. When the limiting pin and the limiting ring groove are aligned, the first spring drives the limiting pin to extend into the limiting ring groove.

[0014] In the aforementioned detection device, the limiting pin is vertically set and installed vertically at the lower part of the fixed cylinder. The lower end of the limiting pin is horizontally fixed to an adjusting rod. The two ends of the first spring are respectively fixedly connected to the outer wall of the fixed cylinder and the adjusting rod. A stop bar is vertically set at the top of the device body corresponding to the position of the adjusting rod.

[0015] The above-mentioned detection device includes a second driving component including a piston cylinder fixed to a support frame, a piston block dynamically and sealingly installed inside the piston cylinder, a piston rod fixedly connected to the piston block, one end of the piston rod extending to the outside of the piston cylinder and connected to the second centering plate, and the inner cavity of the piston cylinder communicating with the inner cavity of the fixed cylinder.

[0016] In the aforementioned detection device, a sliding rod is slidably installed inside the second cylinder. A second spring is fitted onto the portion of the sliding rod outside the second cylinder. The two ends of the second spring respectively abut against the surfaces of the second cylinder and the first centering plate. The end of the sliding rod outside the second cylinder is fixedly connected to the first centering plate. The piston rod is connected to the second centering plate through an elastic connector.

[0017] In the above technical solution, the concrete strength testing device provided by the present invention, by enabling the centering mechanism to have a blocking state that can completely surround the test block, uses the cooperation between the two to block concrete fragments, so as to prevent the fragments from flying away and hitting the observation window. It can also restrain the flying concrete fragments, limiting the fragments from scattering to all parts of the equipment, which is convenient for cleaning. In addition, when the centering mechanism is in the blocking state, it does not contact the surface of the test block, and the test block can expand freely under pressure, ensuring the accuracy of the test results. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the concrete strength testing device provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the device body provided in an embodiment of the present invention;

[0021] Figure 3 A top view showing the positional relationship between the first centering plate and the second centering plate provided in an embodiment of the present invention;

[0022] Figure 4 This is a partial front view of the device body provided in an embodiment of the present invention;

[0023] Figure 5 A cross-sectional view of the first driving member provided in an embodiment of the present invention;

[0024] Figure 6 A cross-sectional view of the second driving component provided in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Device body; 11. Pressure plate; 12. Support plate; 13. Support frame; 14. Guide rod; 15. Stop rod; 16. Hydraulic cylinder; 2. Centering mechanism; 21. First centering plate; 22. Second centering plate; 23. Baffle; 231. Connecting rod; 3. First driving component; 31. Fixed cylinder; 311. Air inlet; 32. First cylinder; 321. Limiting ring groove; 33. Second cylinder; 34. Sliding rod; 341. Second spring; 4. Second driving component; 41. Piston cylinder; 42. Piston block; 43. Piston rod; 5. Locking component; 51. Limiting pin; 52. First spring; 53. Adjusting rod. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figures 1 to 6 As shown in the figure, an embodiment of the present invention provides a concrete strength testing device for building construction, including a device body 1. The device body 1 is provided with a pressure plate 11 and a support plate 12. The pressure plate 11 is driven to move down and press the test block on the support plate 12 to achieve testing. The device body 1 is provided with a support frame 13. The support frame 13 is equipped with a centering mechanism 2. The centering mechanism 2 is driven to press the test block from four directions to achieve centering of the test block. The centering mechanism 2 has a blocking state that can surround the test block.

[0030] Specifically, such as Figure 1 , Figure 2 and Figure 4As shown, the device body 1 is a vertically arranged cabinet structure with a workbench. A support plate 12 is horizontally placed on the workbench. A protective door is hinged to the device body 1 at the position corresponding to the workbench. An observation window is provided on the protective door. The window of the observation window is made of transparent plastic. The pressure plate 11 is located directly above the support plate 12. The device body 1 is also equipped with a hydraulic cylinder 16 for driving the pressure plate 11 to rise and fall vertically. The output end of the hydraulic cylinder 16 is fixedly connected to the pressure plate 11. The device body 1 is also equipped with four guide rods for guiding and limiting the pressure plate 11. The guide rods pass through the four corners of the pressure plate 11 and are fixedly connected to the device body 1. A centering mechanism 2 is provided on the part of the device body 1 above the workbench. After the test block is placed on the support plate 12, the centering mechanism 2 automatically adjusts the position of the test block. In this embodiment, the centering mechanism includes four sets of centering plates and four sets of right-angle baffles 23. Optionally, the right-angle baffle 23 is fixed inside the device body 1 above the support plate 12. The centering plate and the baffle 23 are arranged in a circumferential array around the support plate 12, and the centering plate and the baffle 23 can form a rectangular frame. This is the blocking state of the centering mechanism 2. When in the blocking state, the centering plate and the baffle 23 surround the middle of the test block in the vertical direction to prevent the test block from flying and hitting the observation window when it breaks. The length of the inner wall of the frame is greater than the side length of the test block to ensure that the inner wall of the right-angle baffle 23 is a certain distance from the outer wall of the test block after centering, so as to prevent the test block from being compressed and its lateral expansion is hindered, which would cause the measured compressive strength to be too high. The vertical dimension of the frame is smaller than the side length of the test block to leave a certain distance for the pressure plate 11 to move down so that the pressure plate 11 can completely crush the test block. The centering plate can cooperate with the centering plate to form a rectangular frame.

[0031] During testing, the test block is placed in the middle of the support plate 12 and the protective door is closed. The center plates are controlled to approach the test block from all sides and the position of the test block is adjusted by squeezing. After the test block is adjusted into place, the center plates are driven to retract and cooperate with the baffle 23.

[0032] The concrete strength testing device provided in this embodiment of the invention enables the centering mechanism 2 to have a blocking state that completely surrounds the test block. The cooperation between the two blocks concrete fragments, preventing fragments from flying off and hitting the observation window. It also restrains the flying concrete fragments, limiting their scattering to various parts of the equipment and facilitating cleanup. Furthermore, when in the blocking state, the centering mechanism 2 does not contact the surface of the test block, allowing the test block to expand freely under pressure, ensuring the accuracy of the test results.

[0033] Furthermore, the centering mechanism 2 includes a first centering plate 21 symmetrically arranged on the left and right sides of the support frame 13 and a second centering plate 22 arranged on the front and rear sides of the support frame 13. Each first centering plate 21 has a right-angle baffle 23 symmetrically arranged on both sides. The support frame 13 is provided with a first driving member 3 and a second driving member 4. The first driving member is used to drive each first centering plate 21 to move, and the second driving member 4 is used to drive each second centering plate 22 to move.

[0034] Specifically, for ease of distinction, the plates on the left and right sides of the support frame 13 are the first pair of center plates 21, while the plates on the front and rear sides of the support frame 13 are the second pair of center plates 22. The structures of the first pair of center plates 21 and the second pair of center plates 22 are completely identical, as shown below. Figure 3 As shown, the baffles 23 of the centering mechanism 2 are symmetrically arranged on both sides of the first centering plate 21. In this embodiment, each baffle 23 is fixed to a set position inside the support frame 13. When the first centering plate 21 and the second centering plate 22 move, each baffle 23 remains stationary. The support frame 13 is also provided with a first driving member 3 corresponding to the first centering plate 21 and a second driving member 4 corresponding to the second centering plate 22. The first centering member drives the first centering plate 21 along the length direction of the device body 1, that is, Figure 3 The horizontal movement in the view is such that the second centering member drives its corresponding second centering plate 22 along the width direction of the device body 1, i.e. Figure 3 Vertical movement in the view; In this embodiment, both the first driving member 3 and the second driving member 4 can be electric push rods. Using electric push rods to drive a plate to move back and forth along a set direction is existing technology and will not be described in detail.

[0035] In another embodiment of the present invention, each baffle 23 is movably mounted on the support frame 13, and the baffle 23 is driven to move along the length direction of the device body 1.

[0036] Specifically, in the above embodiment, to ensure that the frame formed by the first centering plate 21, the second centering plate 22, and the baffle 23 has a good protective effect and can block the fragments from flying away after the test block breaks, it is necessary to minimize the gap between the frame and the test block. To facilitate the placement of the test block, in this embodiment, each baffle 23 is also movably mounted on the support frame 13, and the baffle can be driven to move along the length direction of the device body 1, that is, the test block can be driven to... Figure 3 The view is split to the left and right to increase the distance between the baffles 23 on the left and right sides, thereby facilitating the placement of the test block.

[0037] Furthermore, while the first driving member 3 drives the first centering plate 21 to center the test block, it also drives the baffle 23 to move to the blocking position. When the first driving member 3 drives the first centering plate 21 to retract to the blocking position, the baffle 23 remains in the blocking position.

[0038] Furthermore, the first driving component 3 includes a fixed cylinder 31 fixedly connected to the support frame 13, a first cylinder 32 slidably installed inside the fixed cylinder 31, baffles 23 on both sides of the first centering plate 21 being fixedly connected to the first cylinder 32, a second cylinder 33 slidably installed inside the first cylinder 32, the first centering plate 21 being connected to the second cylinder 33 via a connector, an air inlet 311 being provided on the fixed cylinder 31, and a locking component 5 for locking the first cylinder 32 being provided inside the fixed cylinder 31.

[0039] Specifically, such as Figure 3 and Figure 5 As shown, the first driving component 3 includes a fixed cylinder 31 fixed to the support frame 13, an air inlet 311 on the fixed cylinder 31, a first cylinder 32 slidably installed inside the fixed cylinder 31, the first cylinder 32 extending from the end of the fixed cylinder 31 away from the support frame 13, and the first cylinder 32 being dynamically sealed to the fixed cylinder 31; the baffles 23 on both sides of the first centering plate 21 are fixedly connected to the outer wall of the end of the first cylinder 32 extending from the fixed cylinder 31 via connecting rods 231; a second cylinder 33 is slidably installed inside the first cylinder 32, similarly dynamically sealed to the first cylinder 32. The second cylinder 33 extends from the end of the first cylinder 32 away from the support frame 13. The first centering plate 21 is connected to the second cylinder 33 through a connector. In addition, a locking member 5 is provided inside the fixed cylinder 31 to lock the position of the first cylinder 32. The locking member 5 is used to lock the baffle 23 in the blocking position. The blocking position is the position of the baffle 23 and the first centering plate 21 when the baffle 23, the first centering plate 21 and the second centering plate 22 form a blocking state. The device body 1 is also provided with a pump for both pumping and purging, which is used to fill the fixed cylinder 31 with air or extract the gas from the fixed cylinder 31.

[0040] When air is injected into the fixed cylinder 31 through the air inlet 311, the first driving member 3 has a first stroke and a second stroke:

[0041] During the first stroke, as the air pressure inside the fixed cylinder 31 increases, the first cylinder 32 and the second cylinder 33 are pushed to move synchronously, and the first cylinder 32 extends outward from the fixed cylinder 31. During this process, the first cylinder 32 drives the baffle 23 to move, while the second cylinder 33, in the process of moving synchronously with the first cylinder 32, drives the first centering plate 21 to move synchronously with the baffle 23. When the extension and retraction of the first cylinder 32 reaches its maximum, the baffle 23 reaches its working position and stops moving. At this time, the locking member 5 locks the position of the first cylinder 32 inside the fixed cylinder 31, and the first stroke ends.

[0042] In the second stroke, air continues to be pumped into the fixed cylinder 31. Since the first cylinder 32 can no longer move, the second cylinder 33 extends outward from the first cylinder 32 under the push of the gas, and drives the first centering plate 21 to continue to move, so as to achieve centering of the test block.

[0043] While the first centering plate 21 is driven to move, the second driving member 4 drives the second centering plate 22 to move, so as to ensure that the first centering plate 21 and the second centering plate 22 can contact the test block as simultaneously as possible and achieve centering of the test block. After centering is completed, the gas in the fixed cylinder 31 is extracted. Since the position of the first cylinder 32 is locked, as the air pressure in the fixed cylinder 31 continues to decrease, the air pressure on both sides (inner and outer sides) of the second cylinder 33 is different. Under the action of the pressure difference on both sides, the second cylinder 33 contracts into the first cylinder 32 and drives the first centering plate 21 to retract until the first centering plate 21 returns to the position at the end of the first stroke. At this time, all the first centering plates 21, the second centering plate 22 and the baffle 23 together form a rectangular frame to prevent the test block from flying off when it is crushed by pressure.

[0044] In another embodiment of the present invention, the support frame 13 is movably mounted on the device body 1, and the support frame 13 is driven to vertically raise and lower the centering mechanism 2.

[0045] Specifically, to facilitate the cleaning of the broken concrete blocks, in this embodiment, a support frame 13 capable of moving vertically is installed on the device body 1, such as... Figure 3 As shown, the support frame 13 is a rectangular frame with guide rods 14 vertically passing through its four corners. The upper and lower ends of the guide rods 14 are fixedly connected to the device body 1 to guide and limit the support frame 13. The device body 1 is also equipped with a linear drive mechanism for driving the support frame 13 to rise and fall. Using a linear drive mechanism to drive a frame to move vertically is existing technology and will not be described in detail.

[0046] Furthermore, the locking component 5 includes a limiting pin 51 slidably mounted on the fixed cylinder 31. The outer wall of the first cylinder 32 is provided with a limiting ring groove 321 that cooperates with the limiting pin 51. The fixed cylinder 31 is provided with a first spring 52 that maintains the relative position of the limiting pin 51 and the fixed cylinder 31. When the limiting pin 51 and the limiting ring groove 321 are aligned, the first spring 52 drives the limiting pin 51 to extend into the limiting ring groove 321.

[0047] Furthermore, the limiting pin 51 is vertically set and vertically installed at the lower part of the fixed cylinder 31. The lower end of the limiting pin 51 is horizontally fixed to the adjusting rod 53. The two ends of the first spring 52 are respectively fixedly connected to the outer wall of the fixed cylinder 31 and the adjusting rod 53. The top of the device body 1 is vertically set with a stop bar 15 corresponding to the position of the adjusting rod 53.

[0048] Specifically, such as Figure 5As shown, the locking component 5 includes a limiting pin 51 slidably mounted on the fixed cylinder 31, the limiting pin 51 penetrating into the interior of the fixed cylinder 31. A limiting ring groove 321, matching the limiting pin 51, is formed on the outer wall of the first cylinder 32. A first spring 52 is provided on the fixed cylinder 31, one end of which is fixedly connected to the outer wall of the fixed cylinder 31. An adjusting rod 53 is fixedly connected to the end of the limiting pin 51 outside the fixed cylinder 31. The adjusting rod 53 extends horizontally along the radial direction of the fixed cylinder 31 to one side of the fixed cylinder 31. The other end of the first spring 52 is fixedly connected to the adjusting rod 53. When the first cylinder 32 slides relative to the fixed cylinder 31 until the limiting ring groove 321 is directly opposite the limiting pin 51, the first spring 52 pulls the limiting pin 51 to slide on the fixed cylinder 31, so that the limiting pin 51 is inserted into the limiting ring groove 321 to lock the first cylinder 32. A stop bar 15 is provided on the top of the device body 1 corresponding to the position of the adjusting rod 53. Figure 4 As shown, when the support frame 13 is driven to move the fixed cylinder 31 upward, the adjusting rod 53 moves upward synchronously with the fixed cylinder 31 and gradually approaches the stop rod 15. When the adjusting rod 53 contacts the stop rod 15, it is blocked by the stop rod 15 and cannot continue to move upward with the fixed cylinder 31. The adjusting rod 53 will then pull the limiting pin 51 to slide relative to the fixed cylinder 31, thereby pulling the limiting pin 51 out of the limiting ring groove 321 and canceling the limitation on the first cylinder 32.

[0049] With this configuration, the support frame 13 is driven to move the centering mechanism 2 upward, creating space for cleaning the support plate 12. The fixed cylinder 31 passively releases the lock on the first cylinder 32 as the support frame 13 moves upward. Furthermore, after the test block is crushed, some larger fragments are easily stuck between the baffle 23 (first centering plate 21) and the support plate 12. If the baffle 23 and the first centering plate 21 are directly driven to retract horizontally, the stuck fragments can easily damage them. In this embodiment, the upward movement of the support frame 13 passively releases the lock on the first cylinder 32. That is, when the centering mechanism 2 is in a blocking state, the first centering plate 21 cannot continue to retract (moving towards the inner wall of the device body 1), avoiding damage to the baffle 23 and the first centering plate 21 caused by stuck fragments due to incorrect operation.

[0050] It should be noted that in the above embodiments, since the frictional force between the first cylinder 32 and the fixed cylinder 31 cannot be completely equal to or always greater than the frictional force between the second cylinder 33 and the first cylinder 32, when air is being pumped into the fixed cylinder 31, the first cylinder 32 may extend outward from the fixed cylinder 31 at the same time as the second cylinder 33 extends outward from the first cylinder 32. In some cases, the second cylinder 33 may extend outward from the first cylinder 32 first, and then the first cylinder 32 may extend outward from the fixed cylinder 31. Even if the above two situations occur, after the first centering plate 21 contacts the test block, as the resistance of the second cylinder 33 extending outward gradually increases (the resistance reaches its maximum after the test block is centered), continuing to pump air can still drive the first cylinder 32 to extend outward from the fixed cylinder 31, so that the baffle 23 is moved to the blocking state, without affecting the cooperation between the limiting pin 51 and the limiting ring groove 321.

[0051] In another embodiment of the present invention, the second driving member 4 includes a piston cylinder 41 fixedly connected to the support frame 13. A piston block 42 is dynamically and sealingly installed inside the piston cylinder 41. A piston rod 43 is fixedly connected to the piston block 42. One end of the piston rod 43 extends to the outside of the piston cylinder 41 and is connected to the second centering plate 22. The inner cavity of the piston cylinder 41 communicates with the inner cavity of the fixed cylinder 31.

[0052] Specifically, in order to enable the first centering plate 21 and the second centering plate 22 to move synchronously and avoid the first centering plate 21 or the second centering plate 22 clamping the test block first, making it difficult for the test block to move and adjust its position, so as to achieve the best centering effect, in this embodiment, the second driving member 4 includes a piston cylinder 41 fixed to the support frame 13. A piston block 42 is dynamically and sealingly installed inside the piston cylinder 41. A piston rod 43 is fixed to the piston block 42. One end of the piston rod 43 extends to the outside of the piston cylinder 41 and is connected to the second centering plate 22. The piston cylinder 41 is connected to the inner cavity of the fixed cylinder 31 through a pipe (not shown in the figure). That is, the inflation component inflates the fixed cylinder 31 and the piston cylinder 41 at the same time, thereby ensuring that the first centering plate 21 and the second centering plate 22 move synchronously.

[0053] Furthermore, a sliding rod 34 is slidably installed inside the second cylinder 33. A second spring 341 is fitted on the part of the sliding rod 34 outside the second cylinder 33. The two ends of the second spring 341 respectively abut against the surface of the second cylinder 33 and the surface of the first centering plate 21. The end of the sliding rod 34 outside the second cylinder 33 is fixedly connected to the first centering plate 21. The piston rod 43 is connected to the second centering plate 22 through an elastic connector.

[0054] Specifically, to avoid excessive resistance on the first centering plate 21 or the second centering plate 22, which could damage the seals inside the first driving member 3 and the second driving member 4, in this embodiment, a sliding rod 34 is slidably installed inside the second cylinder 33, as shown in the figure. The sliding rod 34 can slide along the axial direction of the second cylinder 33. It should be noted that the sliding rod 34 does not completely penetrate both ends of the second cylinder 33 to ensure that the dynamic seal between the second cylinder 33 and the first cylinder 32 is not affected. One end of the sliding rod 34 outside the second cylinder 33 is fixedly connected to the first centering plate 21. A second spring 341 is also fitted on the sliding rod 34, and one end of the second spring 341 abuts against the second cylinder 33. The other end of the second spring 341 abuts against the surface of the first centering plate 21. After the first centering plate 21 is driven to contact the test block, as the resistance of the first centering plate 21 gradually increases, the sliding rod 34 slides into the second cylinder 33. At the same time, the first centering plate 21 compresses the second spring 341 to contract and store force for buffering, so as to avoid damage to the sealing part inside the first driving member 3 and also to prevent the test block from being clamped too tightly and making it difficult to adjust its position. Similarly, the piston rod 43 is connected to the second centering plate 22 through the elastic rod. The structure of the elastic connecting member is the same as the overall structure formed by the second cylinder 33, the second spring 341 and the sliding rod 34, which will not be described in detail.

[0055] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A concrete strength testing device for building construction, comprising a device body, a pressure plate and a support plate disposed on the device body, wherein the pressure plate is driven to move downward and press a test block on the support plate to achieve testing, characterized in that, The device body is equipped with a support frame, and a centering mechanism is installed on the support frame. The centering mechanism is driven to squeeze the test block from four directions to achieve centering of the test block, and the centering mechanism has a blocking state that can surround the test block.

2. The concrete strength testing device for building construction according to claim 1, characterized in that, The centering mechanism includes a first centering plate symmetrically arranged on the left and right sides of the support frame and a second centering plate arranged on the front and rear sides of the support frame. Each first centering plate has a right-angle baffle symmetrically arranged on both sides. The support frame is equipped with a first driving member and a second driving member. The first driving member is used to drive each first centering plate to move, and the second driving member is used to drive each second centering plate to move.

3. The concrete strength testing device for building construction according to claim 2, characterized in that, Each baffle is movably mounted on the support frame, and the baffle is driven to move along the length of the device body.

4. The concrete strength testing device for building construction according to claim 2, characterized in that, While the first driving member drives the first centering plate to center the test block, it also drives the baffle to move to the blocking position. When the first driving member drives the first centering plate to retract to the blocking position, the baffle remains in the blocking position.

5. A concrete strength testing device for building construction according to claim 2, characterized in that, The first driving component includes a fixed cylinder fixed to a support frame, a first cylinder slidably installed inside the fixed cylinder, baffles on both sides of the first centering plate being fixedly connected to the first cylinder, a second cylinder slidably installed inside the first cylinder, the first centering plate being connected to the second cylinder via a connector, an air inlet being provided on the fixed cylinder, and a locking component for locking the first cylinder being provided inside the fixed cylinder.

6. The concrete strength testing device for building construction according to claim 1, characterized in that, The support frame is movably installed on the main body of the device, and the centering mechanism is vertically raised and lowered by the drive of the support frame.

7. The concrete strength testing device for building construction according to claim 5, characterized in that, The locking component includes a limiting pin that is slidably mounted on the fixed cylinder. The outer wall of the first cylinder is provided with a limiting ring groove that matches the limiting pin. The fixed cylinder is provided with a first spring that maintains the relative position of the limiting pin and the fixed cylinder. When the limiting pin and the limiting ring groove are aligned, the first spring drives the limiting pin to extend into the limiting ring groove.

8. A concrete strength testing device for building construction according to claim 7, characterized in that, The limiting pin is set vertically and installed vertically at the lower part of the fixed cylinder. The lower end of the limiting pin is horizontally fixed to an adjusting rod. The two ends of the first spring are fixedly connected to the outer wall of the fixed cylinder and the adjusting rod, respectively. A stop bar is vertically set at the top of the device body corresponding to the position of the adjusting rod.

9. A concrete strength testing device for building construction according to claim 5, characterized in that, The second driving component includes a piston cylinder fixed to a support frame. A piston block is dynamically sealed inside the piston cylinder. A piston rod is fixed to the piston block. One end of the piston rod extends to the outside of the piston cylinder and is connected to the second centering plate. The inner cavity of the piston cylinder communicates with the inner cavity of the fixed cylinder.

10. A concrete strength testing device for building construction according to claim 9, characterized in that, A sliding rod is slidably installed inside the second cylinder. A second spring is fitted onto the part of the sliding rod outside the second cylinder. The two ends of the second spring abut against the surfaces of the second cylinder and the first centering plate, respectively. The end of the sliding rod outside the second cylinder is fixedly connected to the first centering plate. The piston rod is connected to the second centering plate through an elastic connector.

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