A road pavement deflection value detection device

Abstract

This utility model relates to the field of road inspection technology, specifically a road surface deflection value detection device, including a detection frame and a pressure display located on the outside of the detection frame. The adjustable counterweight assembly includes a pressure plate, a pressure sensor located on the lower side of the pressure plate, a cylindrical drop weight block located on the lower side of the pressure sensor, multiple annular counterweight blocks, a cavity located inside the cylindrical drop weight block, a bidirectional drive mechanism rotatably connected inside the cavity, and a radial insertion locking mechanism connected to the bidirectional drive mechanism. The annular counterweight block is sleeved on the outer wall of the cylindrical drop weight block, and the remaining multiple annular counterweight blocks are sequentially sleeved on the outer wall of the previous annular counterweight block. This device places the pressure sensor between the pressure plate and the cylindrical drop weight block, and the annular counterweight blocks are sleeved on the outer wall of the cylindrical drop weight block, making the pressure transmission more accurate and avoiding distortion and sensor overload. The simultaneous fixing or loosening of multiple annular counterweight blocks replaces individual operation, making field counterweight adjustment more efficient and improving detection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of road inspection technology, specifically a road surface deflection value detection device. Background Technology

[0002] Deflection refers to the vertical deformation of a roadbed or pavement under a specified load. The amount of rebound deflection reflects not only the overall stiffness and strength of the roadbed and pavement structure, but also has a certain intrinsic relationship with the pavement's service condition. Generally, the larger the rebound deflection value, the greater the plastic deformation of the pavement structure (poor stiffness), and the worse its fatigue resistance, making it difficult to withstand heavy traffic. Conversely, the smaller the rebound deflection value, the better the fatigue resistance of the pavement structure and the better it can withstand heavy traffic. Therefore, to know the effect of road deflection, it is generally necessary to use deflection testing equipment for detection.

[0003] A municipal road bending and settling detection device, disclosed in Chinese Patent No. CN219951629U, adjusts the total weight of the detection blocks impacting the road surface by varying the number of counterweights around the support rod, thereby detecting the vertical deformation of the road under different gravitational forces. However, two problems exist in actual operation: First, the adjusted outer counterweights are located above the pressure sensor, and the pressure needs to be transmitted to the sensor through the counterweights and pressure plates. This can easily lead to signal distortion due to gaps between components, and the superimposed load may cause overload damage to the sensor. Second, when the overall weight of the device needs to be adjusted, the operator needs to pull the blocks one by one to add or remove the counterweights. This operation method is particularly cumbersome in field environments, not only consuming a lot of time and energy but also reducing the efficiency of the detection work. Utility Model Content

[0004] The purpose of this invention is to provide a road surface deflection value detection device to solve the problems of existing devices, such as the counterweight being located above the pressure sensor, which can easily cause signal distortion due to transmission gaps and may overload the sensor; and the need to pull the levers one by one to add or remove the counterweight, which is cumbersome and inefficient in field operations.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a road surface deflection value detection device, comprising a detection frame, a pressure display located on the outside of the detection frame, a lifting adjustment mechanism located on the upper side inside the detection frame, a magnetic adsorption component located on the lower side of the lifting adjustment mechanism, and an adjustable counterweight assembly located on the lower side of the magnetic adsorption component. The adjustable counterweight assembly includes a pressure plate, a pressure sensor located on the lower side of the pressure plate, a cylindrical drop weight block located on the lower side of the pressure sensor, multiple annular counterweight blocks, a cavity located inside the cylindrical drop weight block, a bidirectional drive mechanism rotatably connected to the cavity, and radial insertion locking mechanisms connected to the bidirectional drive mechanism and symmetrically arranged. The annular counterweight block is sleeved on the outer wall of the cylindrical drop weight block, and the remaining multiple annular counterweight blocks are sequentially sleeved on the outer wall of the previous annular counterweight block. The axis of the cylindrical drop weight block coincides with the axis of the multiple annular counterweight blocks. The two radial insertion locking mechanisms can be inserted and fixed to both sides of the outer wall of the multiple annular counterweight blocks through the bidirectional drive mechanism.

[0006] Furthermore, the outer walls of the cylindrical falling hammer block and the multiple annular counterweight blocks are provided with strip slots, the strip slots extend along the axial direction of the cylindrical falling hammer block and the annular counterweight blocks, and the inner walls of the multiple annular counterweight blocks are provided with strip columns, the strip columns and the strip slots being fitted with a clearance.

[0007] Furthermore, the outer wall of the annular counterweight has two symmetrical through holes, which penetrate radially through the annular counterweight, and the through holes of multiple annular counterweights are arranged coaxially; the radial insertion locking mechanism includes a movable plate, an insertion post located on one side of the movable plate, and a nut threadedly engaged with the insertion post; the insertion post penetrates the cylindrical drop hammer block and extends through the corresponding through hole to the outer side of the outermost annular counterweight; the nut abuts against the outer wall of the outermost annular counterweight.

[0008] Furthermore, the bidirectional drive mechanism includes a bidirectional lead screw rotatably connected to the cavity, a guide rod disposed in the cavity and located below the bidirectional lead screw, two movable plates threadedly engaged with the bidirectional lead screw, and a drive mechanism disposed on the cylindrical drop hammer block and spaced apart from the pressure sensor; the drive mechanism is drivenly connected to the bidirectional lead screw; both movable plates are slidably engaged with the guide rod; one end of the insertion post is connected to one side of the movable plate.

[0009] Furthermore, the drive mechanism includes a first bevel gear disposed on the outer wall of the bidirectional lead screw and located between a moving plate and a cavity, a second bevel gear meshing with the first bevel gear, a rotating shaft connected to one end of the second bevel gear, a rotating adjustment plate connected to one end of the rotating shaft and located above the cylindrical drop hammer block, a second adjusting screw threadedly connected to the rotating adjustment plate, and a plurality of circumferentially evenly distributed insertion holes disposed on the upper side of the cylindrical drop hammer block and surrounding the rotating shaft; the second adjusting screw is interference-fitted with the insertion holes.

[0010] Furthermore, the magnetic adsorption assembly includes a magnet plate disposed on the upper side of the pressure plate and an electromagnetic block magnetically connected to the upper side of the magnet plate.

[0011] Furthermore, the testing frame includes a portal frame, a support frame located on the lower side of the portal frame, four lockable casters evenly distributed on the lower side of the support frame, and T-shaped grooves respectively located on both sides inside the portal frame; the lifting and adjusting mechanism includes two fixed plates located on the upper side inside the portal frame, a winding roller rotatably connected between the two fixed plates, a motor located on the outer side of one fixed plate, a cable located on the outer wall of the winding roller, a lifting plate connected to one end of the cable, and sliders connected to both ends of the lifting plate, the sliders being slidably adapted to the T-shaped grooves; the output shaft of the motor is connected to one end of the winding roller; the lower side of the lifting plate is connected to the upper side of the electromagnetic block.

[0012] Furthermore, the upper side of the support frame is threaded with four evenly distributed first adjusting screws, the lower end of the first adjusting screws is connected to a support base, and a graduated bubble level is installed on the upper side of the portal frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: In this invention, during testing, a pressure sensor is positioned between the pressure plate and the cylindrical falling weight block, and an annular counterweight block is fitted onto the outer wall of the cylindrical falling weight block. This ensures that the pressure transmission path is the cylindrical falling weight block, the annular counterweight block, the pressure sensor, and the pressure plate. This avoids pressure transmission distortion caused by the counterweight block being located above the sensor, and the pressure sensor directly bears the impact pressure, resulting in more accurate force measurement. Furthermore, by reasonably matching the sensor range with the total counterweight load, overload damage can be prevented. In addition, a bidirectional drive mechanism drives a radial insertion locking mechanism, which can simultaneously insert and fix or loosen multiple annular counterweight blocks, replacing the tedious operation of pulling the blocks one by one. This makes adding or removing counterweight blocks more convenient and efficient in field environments, reducing operation time and effort, and improving testing efficiency. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the road surface deflection value detection device of this utility model; Figure 2 This is a cross-sectional schematic diagram of the adjustable drop weight assembly of this utility model. Figure 3 This is a cross-sectional schematic diagram of the adjustable drop weight assembly of this utility model. Figure 4 This is a schematic diagram of the structure of the annular counterweight of this utility model; Figure 5 This is a schematic diagram of the structure of the annular counterweight of this utility model; Figure 6This is a bottom view of the rotating adjustment plate, cylindrical drop hammer block, rotating adjustment plate, and annular counterweight block of this utility model.

[0015] In the diagram: 1. Portal frame; 2. T-shaped slide rail; 3. Support frame; 4. First adjusting screw; 5. Support base; 6. Lockable caster wheel; 7. Lifting and adjusting mechanism; 8. Magnetic adsorption assembly; 9. Adjustable counterweight assembly; 10. Pressure plate; 11. Pressure sensor; 12. Cylindrical drop weight block; 13. Annular counterweight block; 14. Bidirectional lead screw; 15. Moving plate; 16. Insertion post; 17. Nut; 18. Guide rod; 19. First bevel gear; 20. Second bevel gear; 21. Rotating shaft; 22. Rotating adjusting plate; 23. Second adjusting screw; 24. Insertion hole; 25. Through hole; 26. Strip column; 27. Strip slot; 28. Pressure display; 29. ​​Bubble level; 30. Electromagnetic block; 31. Magnet plate; 32. Fixing plate; 33. Winding roller; 34. Cable; 35. Lifting plate; 36. Slider; 37. Motor. Detailed Implementation

[0016] Please see Figure 1-6 A road surface deflection value detection device includes a detection frame, a pressure display 28 detachably mounted on the outside of the detection frame (gantry frame 1) by bolts, a lifting adjustment mechanism 7 located on the upper side inside the detection frame, a magnetic adsorption assembly 8 located on the lower side of the lifting adjustment mechanism 7, and an adjustable counterweight assembly 9 located on the lower side of the magnetic adsorption assembly 8. The connecting wire of the pressure display 28 passes through a wire hole on the detection frame and is connected to the internal circuit. The adjustable counterweight assembly 9 includes a pressure plate 10, a pressure sensor 11 bolted to the lower side of the pressure plate 10, and a cylindrical drop weight block 1 bolted to the lower side of the pressure sensor 11. 2. Multiple annular counterweights 13, a cavity inside the cylindrical falling weight block 12, a bidirectional drive mechanism rotatably connected inside the cavity, and radial insertion locking mechanisms connected to the bidirectional drive mechanism and symmetrically arranged; the annular counterweights 13 are sleeved on the outer wall of the cylindrical falling weight block 12, and the remaining multiple annular counterweights 13 are sequentially sleeved on the outer wall of the previous annular counterweight 13, and the axis of the cylindrical falling weight block 12 coincides with the axis of the multiple annular counterweights 13; the two radial insertion locking mechanisms can be inserted and fixed to both sides of the outer wall of the multiple annular counterweights 13 through the bidirectional drive mechanism; the ends of the annular counterweights 13 are rounded to facilitate insertion.

[0017] The outer walls of the cylindrical falling weight block 12 and the multiple annular counterweight blocks 13 are provided with strip-shaped slots 27, which extend axially along the cylindrical falling weight block 12 and the annular counterweight blocks 13. The inner walls of the multiple annular counterweight blocks 13 are provided with strip-shaped posts 26, which are clearance-fitted with the strip-shaped slots 27. The clearance between the strip-shaped posts 26 and the strip-shaped slots 27 is controlled within the range of 0.1-0.3mm, which satisfies both assembly flexibility and limits radial wobble. The strip-shaped slots 27 and the strip-shaped posts 26 cooperate to achieve axial guidance. Their clearance fit ensures the smoothness of the annular counterweight blocks 13 during installation and limits the radial rotation of each component, keeping the multiple annular counterweight blocks 13 and the cylindrical falling weight block 12 aligned in the axial direction and preventing skewing during stacking.

[0018] The annular counterweight 13 has two through holes 25 radially through it and symmetrically distributed on both sides of the axis. The diameter of the holes is adapted to the outer diameter of the insertion post 16. The through holes 25 are radially through the annular counterweight 13, and the through holes 25 of multiple annular counterweights 13 are arranged coaxially. The radial insertion locking mechanism includes a movable plate 15, an insertion post 16 vertically welded and fixed to one side of the movable plate 15, and a nut 17 threadedly engaged with the insertion post 16. The insertion post 16 passes through the cylindrical drop hammer block 12 and extends through the corresponding through hole 25 to the outermost annular counterweight 13. The nut 17 and the outermost annular counterweight 13 are engaged. The outer wall of the counterweight 13 abuts against the counterweight; the outer wall of the end of the plug-in post 16 away from the moving plate 15 is provided with an external thread, the length of which is adapted to the thickness of the outermost annular counterweight 13; the nut 17 is threadedly engaged with the external thread of the plug-in post 16, and an elastic washer is fitted on the plug-in post 16 and located between the nut 17 and the outermost annular counterweight 13. In its natural state, the thickness of the elastic washer is slightly greater than its compressed thickness to ensure the preload during locking; a through hole is provided on the cylindrical drop hammer block 12 at the position corresponding to the through hole 25, the diameter of which is slightly larger than the outer diameter of the plug-in post 16 to ensure that the plug-in post 16 can pass through smoothly.

[0019] The bidirectional drive mechanism includes a bidirectional lead screw 14 (its axis is set horizontally) rotatably connected to the two side walls of the cavity via bearings, a guide rod 18 fixedly connected to the cavity and located below the bidirectional lead screw 14 via bolts, two movable plates 15 threadedly engaged with the bidirectional lead screw 14, and a drive mechanism disposed on the cylindrical drop hammer block 12 and spaced apart from the pressure sensor 11. The guide rod 18 is arranged parallel to the bidirectional lead screw 14 below. The drive mechanism is connected to the bidirectional lead screw 14 in a transmission manner. Both movable plates 15 are slidably engaged with the guide rod 18. The outer wall of the guide rod 18 is clearance-fitted with the through hole on the movable plate 15, and a linear bearing is embedded in the through hole. One end of the plug-in post 16 is connected to one side of the movable plate 15.

[0020] The drive mechanism includes a first bevel gear 19 fixedly sleeved on the outer wall of the bidirectional lead screw 14 by a flat key and located between a movable plate 15 and a cavity; a second bevel gear 20 perpendicularly meshed with the first bevel gear 19; a rotating shaft 21 fixedly connected to one end of the second bevel gear 20 by a key; a rotating adjustment plate 22 welded to one end of the rotating shaft 21 and located above the cylindrical drop hammer block 12; a second adjusting screw 23 threadedly connected to the rotating adjustment plate 22; and a plurality of circumferentially evenly distributed insertion holes 24 located on the upper side of the cylindrical drop hammer block 12 and surrounding the rotating shaft 21. A bearing is provided between the rotating shaft 21 and the through hole on the upper side of the cylindrical drop hammer block 12 to reduce rotational friction; the second adjusting screw 23 is interference-fitted with the insertion holes 24.

[0021] Through the meshing transmission of the first bevel gear 19 and the second bevel gear 20, the horizontal rotational motion of the rotary adjustment plate 22 is converted into the rotation of the bidirectional lead screw 14, realizing the synchronous and opposite horizontal movement of the two moving plates 15, thereby driving the radial insertion locking mechanism to quickly lock or release the annular counterweight 13. The operation is convenient, especially for quickly adjusting the number of counterweights to change the detection weight in the field environment; the interference fit between the second adjusting screw 23 and the insertion hole 24 can lock the position of the rotary adjustment plate 22 after adjustment, preventing the bidirectional lead screw 14 from loosening due to vibration and other factors. The magnetic adsorption assembly 8 includes a magnet plate 31 fixedly connected to the upper center of the pressure plate 10 by countersunk bolts, and an electromagnetic block 30 magnetically connected to the upper side of the magnet plate 31. The contact surfaces of the pressure plate 10 and the magnet plate 31 are tightly fitted and coated with an anti-rust coating. The lower side of the electromagnetic block 30 is opposite to the upper side of the magnet plate 31. The upper side of the electromagnetic block 30 is detachably connected to the lower center of the lifting plate 35 by bolts. The adsorption surfaces of the electromagnetic block 30 and the magnet plate 31 are kept parallel to ensure uniform force during adsorption and prevent the adjustable weight drop assembly 9 from tilting. The inspection frame includes a portal frame 1, a support frame 3 bolted to the lower side of the portal frame 1, four lockable casters 6 symmetrically bolted to the four corners of the lower side of the support frame 3 and evenly distributed, and T-shaped grooves 2 vertically formed on both sides inside the portal frame 1, with a wear-resistant coating on the inner wall of the T-shaped grooves 2; the lifting and adjusting mechanism 7 includes two fixed plates 32 vertically welded to the upper side inside the portal frame 1, a winding roller 33 rotatably connected between the two fixed plates 32 via bearings, and a flange for fixing. A motor 37 is located outside a fixed plate 32; a cable 34 is located on the outer wall of a winding roller 33; a lifting plate 35 is connected to one end of the cable 34 by a lifting ring; and sliders 36 are welded to both ends of the lifting plate 35. One end of the cable 34 is fixed to the outer wall of the winding roller 33 by a rope clamp, and the sliders 36 are slidably adapted to the T-shaped groove 2. The output shaft of the motor 37 passes through the fixed plate 32 and is coaxially connected to one end of the winding roller 33 by a coupling. The lower side of the lifting plate 35 is detachably connected to the upper side of the electromagnetic block 30 by bolts.

[0022] Four locking casters 6 enable flexible movement of the equipment, adapting to the transportation needs of complex field sites. The T-shaped chute 2 slides and the sliders 36 at both ends of the lifting plate 35, providing guidance for the lifting adjustment mechanism 7. The motor 37 drives the winding roller 33 to rotate to wind and unwind the cable 34, realizing the height adjustment of the adjustable drop hammer assembly 9, which facilitates the control of the consistency of the drop hammer impact height and ensures the stability of the impact energy under different testing cycles.

[0023] Four evenly distributed first adjusting screws 4 are threadedly connected to the upper side of the support frame 3. Threaded holes penetrating the upper and lower surfaces are provided at the four corners of the upper side of the support frame 3. The four first adjusting screws 4 are threadedly connected to their corresponding threaded holes, and the screw axes are parallel to the vertical direction of the support frame 3. A rotating handwheel is welded to the upper end of each first adjusting screw 4, and the edge of the handwheel has anti-slip texture. The lower end of each first adjusting screw 4 is connected to the upper surface of the support seat 5 via a ball joint structure, allowing the support seat 5 to adaptively adjust the contact angle according to the ground slope. A graduated bubble level 29 is installed on the upper side of the portal frame 1. Using the graduated bubble level 29 on the portal frame 1, the height of each support seat 5 can be adjusted by rotating the handwheel to calibrate the equipment's level, ensuring that the impact direction of the falling hammer is perpendicular to the road surface during testing, thus improving the accuracy of deflection value detection.

[0024] A battery is detachably mounted on one side of the gantry frame 1 via bolts, providing stable power support for the device in outdoor testing scenarios; a PLC controller is also detachably mounted on the other side via bolts. This controller is electrically connected to the electromagnetic block 30 and the motor 37, and can centrally control the start-up and operation process of the equipment.

[0025] Working process and principle: During testing, the equipment level is first calibrated by using the first adjusting screw 4 on the support frame 3 in conjunction with the graduated bubble level 29, and then the overall position is fixed by the locking caster 6; the motor 37 of the lifting adjustment mechanism 7 drives the winding roller 33 to rotate, and the sliders 36 on both sides of the lifting plate 35 are driven to rise and fall smoothly along the T-shaped slide 2 through the cable 34; the electromagnetic block 30 and the magnetic plate 31 are magnetically attracted to achieve the lifting control of the adjustable weight drop assembly 9. When adjusting the test weight, select the appropriate number of annular counterweights 13 according to the test requirements, and sequentially fit them onto the outer wall of the cylindrical drop hammer block 12 or the previous annular counterweight 13. Through the clearance fit between the strip column 26 and the strip slot 27, ensure that the multiple layers of annular counterweights 13 are coaxially positioned and that the through holes 25 of each annular counterweight 13 are aligned. Rotating the rotating adjustment plate 22 drives the rotating shaft 21 and the second bevel gear 20 to rotate. The second bevel gear 20 drives the meshing first bevel gear 19 to rotate, so that the bidirectional lead screw 14 synchronously drives the two moving plates 15 to move horizontally in opposite directions along the guide rod 18. After the insertion post 16 passes through the coaxial through hole 25, it is locked and fixed by the nut 17 and the elastic washer, forming a multi-layer counterweight structure. During the testing phase, the electromagnetic block 30 is de-energized, releasing the adjustable counterweight assembly 9. The cylindrical drop hammer block 12 and the annular counterweight block 13 fall freely to impact the road surface. The pressure sensor 11 detects the impact pressure in real time and transmits it to the pressure display 28 for display. Finally, the road deflection value is calculated based on the pressure data. The entire process relies on mechanical transmission and magnetic control to achieve flexible adjustment of the testing weight and detection of the road deflection value.

[0026] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A road pavement deflection value detection device, comprising a detection frame, a pressure display (28) arranged on the outer side of the detection frame, a lifting adjusting mechanism (7) arranged on the upper side of the inner side of the detection frame, a magnetic adsorption assembly (8) arranged on the lower side of the lifting adjusting mechanism (7), and an adjustable counterweight drop hammer assembly (9) arranged on the lower side of the magnetic adsorption assembly (8), characterized in that, The adjustable counterweight drop hammer assembly (9) includes a pressure plate (10), a pressure sensor (11) located on the lower side of the pressure plate (10), a cylindrical drop hammer block (12) located on the lower side of the pressure sensor (11), multiple annular counterweight blocks (13), a cavity located inside the cylindrical drop hammer block (12), a bidirectional drive mechanism rotatably connected inside the cavity, and a radial insertion locking mechanism connected to the bidirectional drive mechanism and symmetrically arranged; the annular counterweight block (13) is sleeved on the outer wall of the cylindrical drop hammer block (12), and the remaining multiple annular counterweight blocks (13) are sequentially sleeved on the outer wall of the previous annular counterweight block (13), and the axis of the cylindrical drop hammer block (12) coincides with the axis of the multiple annular counterweight blocks (13); the two radial insertion locking mechanisms can be inserted and fixed to both sides of the outer wall of the multiple annular counterweight blocks (13) through the bidirectional drive mechanism.

2. The deflection value detection device according to claim 1, characterized in that The outer walls of the cylindrical drop hammer block (12) and the multiple annular counterweight blocks (13) are provided with strip slots (27). The strip slots (27) extend along the axial direction of the cylindrical drop hammer block (12) and the annular counterweight blocks (13). The inner walls of the multiple annular counterweight blocks (13) are provided with strip columns (26). The strip columns (26) are in clearance fit with the strip slots (27).

3. The deflection value detecting apparatus according to claim 1, characterized by The outer wall of the annular counterweight (13) has two symmetrical through holes (25), which penetrate the annular counterweight (13) radially, and the through holes (25) of multiple annular counterweights (13) are arranged coaxially; the radial insertion locking mechanism includes a movable plate (15), an insertion post (16) located on one side of the movable plate (15), and a nut (17) threadedly engaged with the insertion post (16); the insertion post (16) penetrates the cylindrical drop hammer block (12) and extends through the corresponding through hole (25) to the outer side of the outermost annular counterweight (13); the nut (17) abuts against the outer wall of the outermost annular counterweight (13).

4. The deflection value detection device according to claim 3, characterized in that The bidirectional drive mechanism includes a bidirectional lead screw (14) rotatably connected in the cavity, a guide rod (18) located in the cavity and below the bidirectional lead screw (14), two movable plates (15) threadedly engaged with the bidirectional lead screw (14), and a drive mechanism disposed on the cylindrical drop hammer block (12) and spaced apart from the pressure sensor (11); the drive mechanism is connected to the bidirectional lead screw (14) in a transmission manner; both movable plates (15) are slidably engaged with the guide rod (18); one end of the plug-in post (16) is connected to one side of the movable plate (15).

5. The deflection value detection device according to claim 4, characterized in that The drive mechanism includes a first bevel gear (19) located on the outer wall of the bidirectional lead screw (14) and between a movable plate (15) and a cavity, a second bevel gear (20) meshing with the first bevel gear (19), a rotating shaft (21) connected to one end of the second bevel gear (20), a rotating adjustment plate (22) connected to one end of the rotating shaft (21) and located above the cylindrical drop hammer block (12), a second adjusting screw (23) threadedly connected to the rotating adjustment plate (22), and a plurality of circumferentially evenly distributed insertion holes (24) located on the upper side of the cylindrical drop hammer block (12) and surrounding the rotating shaft (21); the second adjusting screw (23) and the insertion holes (24) are interference-fitted.

6. The deflection value detection device according to claim 1, characterized in that The magnetic adsorption assembly (8) includes a magnet plate (31) disposed on the upper side of the pressure plate (10) and an electromagnetic block (30) magnetically connected to the upper side of the magnet plate (31).

7. The deflection value detection device according to claim 6, characterized in that The testing frame includes a portal frame (1), a support frame (3) located on the lower side of the portal frame (1), four lockable casters (6) located on the lower side of the support frame (3) and evenly distributed, and T-shaped grooves (2) located on both sides inside the portal frame (1); the lifting adjustment mechanism (7) includes two fixed plates (32) located on the upper side inside the portal frame (1), a winding roller (33) rotatably connected between the two fixed plates (32), a motor (37) located on the outer side of one fixed plate (32), a cable (34) located on the outer wall of the winding roller (33), a lifting plate (35) connected to one end of the cable (34), and a slider (36) connected to both ends of the lifting plate (35). The slider (36) is slidably adapted to the T-shaped groove (2); the output shaft of the motor (37) is connected to one end of the winding roller (33); the lower side of the lifting plate (35) is connected to the upper side of the electromagnetic block (30).

8. The deflection value detection device according to claim 7, characterized in that The upper side of the support frame (3) is threaded with four evenly arranged first adjusting screws (4), and the lower end of the first adjusting screws (4) is connected to a support base (5). The upper side of the gantry frame (1) is equipped with a graduated bubble level (29).

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