A concrete strength testing device for road and bridge construction

Abstract

The present invention discloses a concrete strength detection device for road and bridge construction, which belongs to the technical field of concrete strength detection, and comprises a main frame assembly, a self-centering transmission structure, a strength detection assembly, a pressure position adjustment mechanism and a centering adjustment structure, wherein the self-centering transmission structure is arranged on the side of the main frame assembly. The present invention automatically completes the centering of concrete samples of different sizes and shapes during the compression test of concrete samples by setting a self-centering transmission structure, a strength detection assembly and a centering adjustment structure, and ensures that the center of the sample is aligned with the center of the rotating block, thereby greatly improving the accuracy and reliability of the concrete sample test results, and effectively solves the problem that the existing concrete strength detection device cannot complete the self-centering of the concrete sample, and still needs to be manually operated to ensure that the center position of the cube sample is aligned with the center position of the extrusion plate, which affects the accuracy and reliability of the test results.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete strength detection, and specifically refers to a concrete strength detection device for road and bridge construction. Background Art

[0002] As one of the most widely used structural materials in modern construction projects, the strength of concrete is directly related to the safety and durability of buildings. The strength of concrete determines its ability to bear loads. In construction projects, insufficient concrete strength may lead to structural failure, while excessive strength may cause material waste and increased costs. Therefore, accurate testing of concrete strength is crucial to ensure project safety and economy. Cube compressive strength test is one of the ways to test concrete strength.

[0003] In actual use, in order to ensure the accuracy and reliability of the cube compressive strength test results, the center position of the cube sample needs to be aligned with the center position of the extrusion plate during the test so that the cube sample can be evenly stressed. The existing concrete strength testing device cannot complete the self-centering of the concrete sample and still requires manual operation, which not only affects the work efficiency, but also cannot ensure that the center position of the cube sample is aligned with the center position of the extrusion plate, affecting the accuracy and reliability of the test results. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a concrete strength testing device for road and bridge construction. By setting a self-centering transmission structure, a strength testing component and a centering adjustment structure, the centering of concrete samples of different sizes and shapes is automatically completed during the compression test of the concrete samples, ensuring that the center of the sample is aligned with the center of the rotating block, thereby greatly improving the accuracy and reliability of the concrete sample test results, and effectively solving the problem that the existing concrete strength testing device cannot complete the self-centering of the concrete sample, and still needs manual operation to ensure that the center position of the cube sample is aligned with the center position of the extrusion plate, affecting the accuracy and reliability of the test results.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a concrete strength detection device for road and bridge construction, including a main frame assembly, a self-centering transmission structure, a strength detection assembly, a pressure position adjustment mechanism and a centering adjustment structure, wherein the self-centering transmission structure is arranged on the side of the main frame assembly, the strength detection assembly is arranged on the main frame assembly, the strength detection assembly is connected to the self-centering transmission structure, the pressure position adjustment mechanism is arranged on the strength detection assembly, the centering adjustment structure is arranged on the main frame assembly, and the centering adjustment structure is connected to the self-centering transmission structure.

[0006] Furthermore, the self-centering transmission structure includes a driven gear, a positioning shaft, a driving pulley, a driven pulley, a transmission belt, a rotating shaft and an active friction disk, the driven gear is arranged on the main frame assembly, the positioning shaft is rotatably connected to the main frame assembly, the positioning shaft passes through and is fixedly connected to the driven gear, the driving pulley is fixedly connected to the positioning shaft, the driven pulley is arranged on the main frame assembly, a transmission belt is connected between the driven pulley and the driving pulley, the rotating shaft passes through and is fixedly connected to the driven pulley, the rotating shaft is rotatably connected to the main frame assembly, and the active friction disk is fixedly connected to one end of the rotating shaft away from the driven pulley, so that the device can convert the up and down displacement of the lifting and lowering mounting plate during the detection process into a driving force and transmit the driving force.

[0007] Furthermore, the strength detection assembly includes a hydraulic cylinder, an output shaft, a lifting mounting plate, a fixed bracket, a latch, a vertical plate, a one-way screw, a sliding bracket and a driving rack. The hydraulic cylinder is fixedly connected to the main frame assembly, the output shaft is fixedly connected to the hydraulic cylinder, the output shaft passes through and is slidably connected to the main frame assembly, the lifting mounting plate is fixedly connected to the output shaft, the fixed bracket is fixedly connected to the lifting mounting plate, the latch is fixedly connected to the fixed bracket, the vertical plate is fixedly connected to the lifting mounting plate, the one-way screw is rotatably connected to the vertical plate, a horizontal slide groove is opened on the lifting mounting plate, the sliding bracket is slidably connected in the horizontal slide groove, the sliding bracket is threadedly connected to the one-way screw, and the driving rack is fixedly connected to the sliding bracket, so that the device can complete the compressive strength detection of the concrete sample.

[0008] Furthermore, the pressure position adjustment mechanism includes a connecting plate, a rotating gear, a follower gear, a connecting shaft, a rotating block, a bidirectional screw and a moving rod, the connecting plate is fixedly connected to the lifting mounting plate, the rotating gear is rotatably connected to the connecting plate, the follower gear is meshedly connected to the rotating gear, the connecting shaft is fixedly connected to the follower gear, the connecting shaft penetrates and is rotatably connected to the connecting plate, the rotating block is fixedly connected to the connecting shaft, a moving groove is provided on the bottom surface of the rotating block, the bidirectional screw is arranged in the moving groove, the bidirectional screw is rotatably connected to the rotating block, the moving rod is slidably connected in the moving groove, and the moving rod is threadedly connected to the bidirectional screw, so that the device can perform compression resistance detection on any point on the concrete sample.

[0009] Furthermore, the centering adjustment structure includes a driven friction disk, a driving screw and a movable push plate, the driven friction disk is in contact with and connected to the active friction disk, the driving screw is rotationally connected to the main frame assembly, and the movable push plate is threadedly connected to the driving screw, so that the device can automatically complete the centering operation of the concrete sample.

[0010] Furthermore, the main frame assembly includes a fixed base, a column, a top plate and a fixed plate, the column is fixedly connected to the fixed base, the top plate is fixedly connected to an end of the column away from the fixed base, a deep limiting groove is provided on the fixed base, a shallow limiting groove is provided on the fixed base, and the fixed plate is fixedly connected to the side of the fixed base.

[0011] Furthermore, the depth of the deep limit slot is greater than that of the shallow limit slot, the driving screw is rotatably connected to the deep limit slot and the shallow limit slot, and the movable push plate is slidably connected to the deep limit slot and the shallow limit slot.

[0012] Furthermore, the rotating gear is meshedly connected to the driving rack, and the latching teeth are meshedly connected to the driven gear.

[0013] Furthermore, the self-centering transmission structure is provided with two groups, and the rotating shaft penetrates through and is rotatably connected to the fixed plate.

[0014] Furthermore, the driving screws are distributed in a cross shape, and the thread structures on the outer surfaces of the driving screws and the bidirectional screws are symmetrically arranged.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows:

[0016] In order to solve the problem that the existing concrete strength testing device cannot complete the self-centering of the concrete sample, and still needs to be manually operated to ensure that the center position of the cube sample is aligned with the center position of the extrusion plate, which affects the accuracy and reliability of the test results, the present invention automatically completes the centering of concrete samples of different sizes and shapes during the compression test of the concrete sample by setting a self-centering transmission structure, a strength detection component and a centering adjustment structure, ensuring that the center of the sample is aligned with the center of the rotating block, thereby greatly improving the accuracy and reliability of the concrete sample test results;

[0017] Among them, the self-centering transmission structure includes a driven gear, which can effectively convert the up and down displacement of the lifting installation plate into the driving force of the centering adjustment structure, and complete the self-centering processing of the concrete sample through the centering adjustment structure. At the same time, after the detection is completed, the centering adjustment structure can be driven to reset to the initial state;

[0018] In addition, there are two groups of self-centering transmission structures, the self-centering transmission structure includes an active friction disc, and the centering adjustment structure includes a driven friction disc. The self-centering transmission structure and the centering adjustment structure are transmitted through the active friction disc and the driven friction disc. After one group of self-centering transmission structures completes the centering operation, the corresponding active friction disc cannot drive the driven friction disc to rotate and idles, and the other group of self-centering transmission structures drives the centering adjustment structure normally. After the sample is completely centered, the two active friction discs both idle, so that the device can complete the centering without affecting the detection;

[0019] The pressure position adjustment mechanism includes a rotating block. The moving rod arranged on the rotating block can be displaced under the action of the bidirectional screw. The rotating block itself can be adjusted in angle under the joint action of the rotating gear and the follower gear. Therefore, the device can not only extrude the upper surface of the concrete sample, but also perform compression test on any point on the concrete sample, thereby ensuring the comprehensiveness of the compressive strength test results of the concrete sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a concrete strength detection device for road and bridge construction proposed by the present invention;

[0021] Figure 2 This is a schematic diagram of the exploded three-dimensional structure of a concrete strength detection device for road and bridge construction proposed by the present invention;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the self-centering transmission structure;

[0023] Figure 4 It is a schematic diagram of the exploded three-dimensional structure of the strength detection component;

[0024] Figure 5 A partial bottom view of the pressure position adjustment mechanism;

[0025] Figure 6 It is a three-dimensional schematic diagram of the connection structure between the strength detection component and the pressure position adjustment mechanism;

[0026] Figure 7 It is a partial cross-sectional view of the strength detection component and the pressure position adjustment mechanism;

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the centering and adjusting structure;

[0028] Fig. 9 It is a schematic diagram of the cross-sectional structure of the main frame assembly.

[0029] Among them, 1. Main frame assembly; 101. Fixed base; 102. Column; 103. Top plate; 104. Deep limit slide; 105. Shallow limit slide; 106. Fixed plate; 2. Self-centering transmission structure; 201. Driven gear; 202. Positioning shaft; 203. Active pulley; 204. Driven pulley; 205. Transmission belt; 206. Rotating shaft; 207. Active friction disc; 3. Strength detection assembly; 301. Hydraulic cylinder; 302. Output shaft; 303. Lifting mounting plate; 304. 04. Fixed bracket; 305. Gear; 306. Vertical plate; 307. One-way screw; 308. Horizontal slide groove; 309. Sliding bracket; 310. Driving rack; 4. Pressure position adjustment mechanism; 401. Connecting plate; 402. Rotating gear; 403. Follower gear; 404. Connecting shaft; 405. Rotating block; 406. Moving groove; 407. Two-way screw; 408. Moving rod; 5. Centering adjustment structure; 501. Driven friction disk; 502. Driving screw; 503. Movable push plate.

[0030] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] like Figure 1-Figure 9As shown, the present invention proposes a concrete strength detection device for road and bridge construction, including a main frame component 1, a self-centering transmission structure 2, a strength detection component 3, a pressure position adjustment mechanism 4 and a centering adjustment structure 5, the self-centering transmission structure 2 is arranged on the side of the main frame component 1, the strength detection component 3 is arranged on the main frame component 1, the strength detection component 3 is connected to the self-centering transmission structure 2, the pressure position adjustment mechanism 4 is arranged on the strength detection component 3, the centering adjustment structure 5 is arranged on the main frame component 1, and the centering adjustment structure 5 is connected to the self-centering transmission structure 2.

[0034] Among them, the self-centering transmission structure 2 includes a driven gear 201, a positioning shaft 202, a driving pulley 203, a driven pulley 204, a transmission belt 205, a rotating shaft 206 and an active friction disk 207. The driven gear 201 is arranged on the main frame assembly 1, the positioning shaft 202 is rotatably connected to the main frame assembly 1, the positioning shaft 202 passes through and is fixedly connected to the driven gear 201, the driving pulley 203 is fixedly connected to the positioning shaft 202, the driven pulley 204 is arranged on the main frame assembly 1, a transmission belt 205 is connected between the driven pulley 204 and the driving pulley 203, the rotating shaft 206 passes through and is fixedly connected to the driven pulley 204, the rotating shaft 206 is rotatably connected to the main frame assembly 1, and the active friction disk 207 is fixedly connected to the end of the rotating shaft 206 away from the driven pulley 204.

[0035] Among them, the strength detection component 3 includes a hydraulic cylinder 301, an output shaft 302, a lifting mounting plate 303, a fixed bracket 304, a latch 305, a vertical plate 306, a one-way screw 307, a sliding bracket 309 and a driving rack 310. The hydraulic cylinder 301 is fixedly connected to the main frame component 1, the output shaft 302 is fixedly connected to the hydraulic cylinder 301, the output shaft 302 passes through and is slidably connected to the main frame component 1, the lifting mounting plate 303 is fixedly connected to the output shaft 302, the fixed bracket 304 is fixedly connected to the lifting mounting plate 303, the latch 305 is fixedly connected to the fixed bracket 304, the vertical plate 306 is fixedly connected to the lifting mounting plate 303, the one-way screw 307 is rotatably connected to the vertical plate 306, a horizontal slide groove 308 is opened on the lifting mounting plate 303, the sliding bracket 309 is slidably connected in the horizontal slide groove 308, the sliding bracket 309 is threadedly connected to the one-way screw 307, and the driving rack 310 is fixedly connected to the sliding bracket 309.

[0036] Among them, the pressure position adjustment mechanism 4 includes a connecting plate 401, a rotating gear 402, a follower gear 403, a connecting shaft 404, a rotating block 405, a bidirectional screw 407 and a moving rod 408. The connecting plate 401 is fixedly connected to the lifting mounting plate 303, the rotating gear 402 is rotationally connected to the connecting plate 401, the follower gear 403 is meshed and connected to the rotating gear 402, the connecting shaft 404 is fixedly connected to the follower gear 403, the connecting shaft 404 penetrates and is rotationally connected to the connecting plate 401, the rotating block 405 is fixedly connected to the connecting shaft 404, and a moving groove 406 is opened on the bottom surface of the rotating block 405, the bidirectional screw 407 is arranged in the moving groove 406, the bidirectional screw 407 is rotationally connected to the rotating block 405, the moving rod 408 is slidably connected in the moving groove 406, and the moving rod 408 is threadedly connected to the bidirectional screw 407, so that the moving rod 408 can perform synchronous relative displacement.

[0037] In addition, the centering adjustment structure 5 includes a driven friction disc 501, a driving screw 502 and a movable push plate 503, the driven friction disc 501 is contact-connected to the active friction disc 207, the driving screw 502 is rotationally connected to the main frame assembly 1, and the movable push plate 503 is threadedly connected to the driving screw 502.

[0038] In addition, the main frame assembly 1 includes a fixed base 101, a column 102, a top plate 103 and a fixed plate 106. The column 102 is fixedly connected to the fixed base 101, the top plate 103 is fixedly connected to one end of the column 102 away from the fixed base 101, a deep limiting groove 104 is opened on the fixed base 101, a shallow limiting groove 105 is opened on the fixed base 101, and the fixed plate 106 is fixedly connected to the side of the fixed base 101.

[0039] Among them, the depth of the deep limit slot 104 is greater than the depth of the shallow limit slot 105, so that the driving screw 502 does not affect each other. The driving screw 502 is rotatably connected in the deep limit slot 104 and the shallow limit slot 105, and the movable push plate 503 is slidably connected to the deep limit slot 104 and the shallow limit slot 105.

[0040] The rotating gear 402 is meshed and connected to the driving rack 310, and the latch tooth 305 is meshed and connected to the driven gear 201. The center point position of the rotating block 405 corresponds to the center point position of the fixed base 101. The self-centering transmission structure 2 is provided with two groups. The rotating shaft 206 penetrates and is rotatably connected to the fixed plate 106. The driving screw 502 is distributed in a cross shape, and the threaded structures on the outer surfaces of the driving screw 502 and the bidirectional screw 407 are symmetrically arranged.

[0041] When in use, a concrete cube sample is placed on the fixed base 101, and then the hydraulic cylinder 301 is started. The hydraulic cylinder 301 starts to drive the lifting installation plate 303 to move downward through the output shaft 302, and the lifting installation plate 303 drives the latching gear 305 to move downward synchronously. As the latching gear 305 moves downward, the latching gear 305 drives the driven gear 201 to rotate, and the driven gear 201 drives the driving pulley 203 to rotate synchronously through the positioning shaft 202, and the driving pulley 203 drives the driven gear 201 through the transmission belt 205. The driven pulley 204 rotates synchronously, and the driven pulley 204 drives the active friction disc 207 to rotate through the rotating shaft 206. The active friction disc 207 is in contact with the driven friction disc 501. The active friction disc 207 drives the driven friction disc 501 to rotate through friction force, thereby rotating the driving screw 502. As the driving screw 502 rotates, the movable push plate 503 provided on the driving screw 502 begins to perform synchronous relative displacement along the deep limit groove 104 and the shallow limit groove 105.

[0042] When the sample is not at the center position, one of the movable push plates 503 connected to the lateral driving screw 502 will first contact the outer surface of the sample. As the movable push plate 503 continues to move, the movable push plate 503 will push the sample to move until the two movable push plates 503 set on the driving screw 502 are in contact with the outer surface of the sample. At this time, the sample is already located at the center of gravity of the fixed base 101 in the lateral direction, and the lifting mounting plate 303 still needs to continue to move downward. Since the horizontal position of the sample has been calibrated, the resistance to the rotation of the lateral driving screw 502 is greatly increased, and the friction between the driven friction disk 501 and the active friction disk 207 cannot be used to drive the lateral driving screw 502. Therefore, when the lifting mounting plate 303 continues to descend, the lateral active friction disk 207 will idle, thereby ensuring that the longitudinal driving screw 502 can rotate.

[0043] After the lateral position of the sample is calibrated, the longitudinal driving screw 502 continues to rotate and drives the movable push plate 503 to perform synchronous relative displacement until the longitudinal position of the sample is calibrated. At this time, there is still a certain distance between the rotating block 405 connected to the lifting mounting plate 303 and the sample. At this time, as the lifting mounting plate 303 continues to move downward, the lateral driving screw 502 and the active friction disk 207 corresponding to the longitudinal driving screw 502 are both idle, and then the rotating block 405 moves to the upper surface of the sample. At this time, the bottom surface of the rotating block 405 is in direct contact with the upper surface of the sample, and the rotating block 405 applies pressure to the sample. The rotating block 405 cannot continue to move downward, and the pressure applied by the hydraulic cylinder 301 continues to increase, thereby completing the compressive strength test of the sample.

[0044] When it is necessary to detect certain points on the upper surface of the sample, the user can manually control the two-way screw 407 to rotate. The rotation of the two-way screw 407 drives the moving rod 408 to perform synchronous relative displacement along the moving groove 406 until the point of the moving rod 408 and the point to be detected are on the same circle with the fixed base 101 as the center. Then, the user can rotate the one-way screw 307 again. The rotation of the one-way screw 307 drives the driving rack 310 to move through the sliding bracket 309. The displacement of the driving rack 310 drives the rotating gear 402 to rotate. The rotating gear 402 drives the follower gear 403 to rotate. The follower gear 403 drives the rotating block 405 to rotate synchronously through the connecting shaft 404 until the position of the moving rod 408 coincides with the position of the point to be detected. At this time, the moving rod 408 applies pressure to the sample.

[0045] After the detection is completed, the hydraulic cylinder 301 drives the lifting mounting plate 303 and the rotating block 405 to reset, and the driven gear 201 rotates in the opposite direction driven by the latch tooth 305. Since the resistance to the reverse displacement of the movable push plate 503 is small, the active friction disk 207 can drive the driving screw 502 to rotate through the driven friction disk 501, so that the movable push plate 503 can be reset to the initial state. Finally, the broken concrete cube sample is cleaned up for subsequent use. The above is the overall workflow of the present invention. You can repeat this step next time you use it. The actual operation process is very simple and easy.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0048] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A concrete strength detection device for road and bridge construction, characterized in that: The invention comprises a main frame component (1), a self-centering transmission structure (2), a strength detection component (3), a pressure position adjustment mechanism (4) and a centering adjustment structure (5), wherein the self-centering transmission structure (2) is arranged on the side of the main frame component (1), the strength detection component (3) is arranged on the main frame component (1), the strength detection component (3) is connected to the self-centering transmission structure (2), the pressure position adjustment mechanism (4) is arranged on the strength detection component (3), the centering adjustment structure (5) is arranged on the main frame component (1), and the centering adjustment structure (5) is connected to the self-centering transmission structure (2); The self-centering transmission structure (2) comprises a driven gear (201), a positioning shaft (202), a driving pulley (203), a driven pulley (204), a transmission belt (205), a rotating shaft (206) and a driving friction disk (207); the driven gear (201) is arranged on the main frame component (1); the positioning shaft (202) is rotatably connected to the main frame component (1); the positioning shaft (202) passes through and is fixedly connected to the driven gear (201); the driving pulley (20 3) fixedly connected to the positioning shaft (202), the driven pulley (204) is arranged on the main frame assembly (1), a transmission belt (205) is connected between the driven pulley (204) and the driving pulley (203), the rotating shaft (206) passes through and is fixedly connected to the driven pulley (204), the rotating shaft (206) is rotatably connected to the main frame assembly (1), and the driving friction disc (207) is fixedly connected to one end of the rotating shaft (206) away from the driven pulley (204); The strength detection component (3) comprises a hydraulic cylinder (301), an output shaft (302), a lifting installation plate (303), a fixed bracket (304), a latching tooth (305), a vertical plate (306), a one-way screw (307), a sliding bracket (309) and a driving rack (310); the hydraulic cylinder (301) is fixedly connected to the main frame component (1); the output shaft (302) is fixedly connected to the hydraulic cylinder (301); the output shaft (302) penetrates and is slidably connected to the main frame component (1); the lifting installation plate (303) is fixedly connected to the output shaft (302); The fixed bracket (304) is fixedly connected to the lifting installation plate (303), the latching teeth (305) are fixedly connected to the fixed bracket (304), the vertical plate (306) is fixedly connected to the lifting installation plate (303), the one-way screw (307) is rotatably connected to the vertical plate (306), a horizontal slide groove (308) is provided on the lifting installation plate (303), the sliding bracket (309) is slidably connected to the horizontal slide groove (308), the sliding bracket (309) is threadedly connected to the one-way screw (307), and the driving rack (310) is fixedly connected to the sliding bracket (309); The centering adjustment structure (5) comprises a driven friction disc (501), a driving screw (502) and a movable push plate (503); the driven friction disc (501) is in contact with and connected to the active friction disc (207); the driving screw (502) is rotationally connected to the main frame assembly (1); and the movable push plate (503) is threadedly connected to the driving screw (502); The latching teeth (305) are meshedly connected to the driven gear (201).

2. A concrete strength detection device for road and bridge construction according to claim 1, characterized in that: The pressure position adjustment mechanism (4) comprises a connecting plate (401), a rotating gear (402), a follower gear (403), a connecting shaft (404), a rotating block (405), a bidirectional screw (407) and a moving rod (408), wherein the connecting plate (401) is fixedly connected to the lifting installation plate (303), the rotating gear (402) is rotationally connected to the connecting plate (401), the follower gear (403) is meshedly connected to the rotating gear (402), and the connecting shaft (404) is fixedly connected to the follower gear ( 403), the connecting shaft (404) passes through and is rotatably connected to the connecting plate (401), the rotating block (405) is fixedly connected to the connecting shaft (404), a movable groove (406) is provided on the bottom surface of the rotating block (405), the bidirectional screw (407) is arranged in the movable groove (406), the bidirectional screw (407) is rotatably connected to the rotating block (405), the movable rod (408) is slidably connected to the movable groove (406), and the movable rod (408) is threadedly connected to the bidirectional screw (407).

3. A concrete strength detection device for road and bridge construction according to claim 2, characterized in that: The main frame assembly (1) comprises a fixed base (101), a column (102), a top plate (103) and a fixed plate (106); the column (102) is fixedly connected to the fixed base (101); the top plate (103) is fixedly connected to an end of the column (102) away from the fixed base (101); a deep limiting slide groove (104) is provided on the fixed base (101); a shallow limiting slide groove (105) is provided on the fixed base (101); and the fixed plate (106) is fixedly connected to a side surface of the fixed base (101).

4. A concrete strength detection device for road and bridge construction according to claim 3, characterized in that: The depth of the deep limit slide groove (104) is greater than the depth of the shallow limit slide groove (105), the driving screw (502) is rotatably connected to the deep limit slide groove (104) and the shallow limit slide groove (105), and the movable push plate (503) is slidably connected to the deep limit slide groove (104) and the shallow limit slide groove (105).

5. A concrete strength detection device for road and bridge construction according to claim 4, characterized in that: The rotating gear (402) is meshedly connected to the driving rack (310).

6. A concrete strength detection device for road and bridge construction according to claim 5, characterized in that: The self-centering transmission structure (2) is provided with two groups, and the rotating shaft (206) penetrates and is rotatably connected to the fixed plate (106).

7. A concrete strength detection device for road and bridge construction according to claim 6, characterized in that: The driving screw rods (502) are arranged in a cross shape, and the thread structures on the outer surfaces of the driving screw rods (502) and the bidirectional screw rod (407) are symmetrically arranged.

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