An adjustable preformed cover plate resting flattening device

Abstract

The utility model relates to civil engineering construction technical field discloses an adjustable prefabricated cover plate rests flat device, including adjusting screw rod and screw hole, the screw hole is established in the inside of base, the adjusting screw rod side wall is connected in the inside of screw hole, the inside of base is provided with elastic self -locking tooth, elastic self -locking tooth is located in the inside of screw hole, elastic self -locking tooth tooth top and adjusting screw rod screw tooth shape match, form one -way mesh structure, the bottom fixed connection of adjusting screw rod has axle pin sleeve, the inside rotation of axle pin sleeve is connected with rotating handle. In the utility model, through the double fixing of base's diamond grid pattern and magnetic rubber strip, the accurate height adjustment and locking of adjusting screw rod and elastic self -locking tooth, the horizontal angle fine adjustment of tray and ball hinge base, make prefabricated cover plate can realize the accurate regulation and control of height and horizontal angle and stable rest fast, improve the installation quality and efficiency of prefabricated cover plate through above -mentioned structure.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction technology, and in particular to an adjustable precast cover plate placement and leveling device. Background Technology

[0002] In municipal drainage, factory open ditches, and port storage yards, precast cover slabs are crucial components of drainage ditches, and their installation flatness directly affects drainage efficiency, traffic safety, and overall project quality. Precast cover slabs are typically placed on a support surface at the top of the ditch. Due to issues such as concrete pouring errors and uneven foundation settlement during ditch construction, the support surface often exhibits height deviations or horizontal tilting. Therefore, specialized devices are needed to adjust the support height and horizontal angle of the precast cover slabs to ensure a flat and stable installation. An adjustable precast cover slab support and leveling device has been developed to address this need, aiming to achieve precise control during cover slab installation through structural design, meeting the stringent flatness requirements of engineering projects.

[0003] Currently, the flatness adjustment during the installation of precast cover plates largely relies on traditional mechanical structures. For example, steel blocks or concrete supports of fixed height are used as the supporting foundation, and the height is fine-tuned by inserting metal sheets or wedges between the blocks and the cover plate. Horizontal angle adjustment mostly relies on manually prying the cover plate, observing and adjusting the angle with a level, and then fixing the cover plate to the pre-embedded parts of the trench by welding or bolts. In some scenarios, simple screw jacks are also used as height adjustment tools, using the threaded transmission of the screw and nut to achieve lifting and lowering, and then fixing the position by manually tapping or adding shims.

[0004] However, in existing technologies, fixed pads or supports cannot adapt to the height deviation of the support surface. The padding method of metal sheets or wedge blocks is difficult to achieve precise quantitative adjustment of the height. Moreover, when manually adjusting the horizontal angle, uneven force can easily lead to excessive angle deviation. At the same time, traditional screw jacks lack a reliable self-locking structure, and welding or bolt fixing methods are prone to loosening under vibration, settlement and other environments. Ultimately, this results in poor flatness of the precast cover plate after installation and unstable adhesion to the trench body, affecting the project quality and service life. Therefore, an adjustable precast cover plate support and leveling device is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an adjustable precast cover plate placement and leveling device, which aims to improve the problems of poor flatness and easy loosening of precast cover plates during installation due to unstable support and low adjustment accuracy in the prior art.

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

[0007] An adjustable prefabricated cover plate placement and leveling device includes a base, wherein a height adjustment component is provided inside the base, and a horizontal adjustment component is provided on the side wall of the base.

[0008] The height adjustment assembly includes an adjustment screw and a threaded hole. The threaded hole is located inside the base. The side wall of the adjustment screw is threaded into the threaded hole. The base has a self-locking elastic tooth located inside the threaded hole. The tip of the self-locking elastic tooth matches the thread profile of the adjustment screw, forming a one-way meshing structure. A shaft pin is fixedly connected to the bottom of the adjustment screw. A rotating handle is rotatably connected inside the shaft pin. A telescopic handle is slidably connected inside the rotating handle. The telescopic handle has multiple insertion holes inside. A pin is slidably connected inside the rotating handle. The length of the telescopic handle is adjusted by inserting the pin into the insertion holes at different positions.

[0009] In a further technical solution, the leveling component includes a tray located at the top of the adjusting screw, an annular water guide groove is provided inside the tray, and an adjusting ball is fixedly connected to the bottom of the tray.

[0010] In a further technical solution, there are eight elastic self-locking teeth, which are evenly distributed circumferentially along the inner wall of the threaded hole. The surface of the base is coated with a 0.3mm thick epoxy resin coating, and the bottom is formed with a diamond-shaped grid pattern by stamping.

[0011] In a further technical solution, the adjusting screw has an upper nut and a lower nut threadedly connected to its side wall. The upper nut is located above the base, and the lower nut is located below the base. A disc spring is sleeved on the side wall of the adjusting screw. One end of the disc spring is fixedly connected to the bottom of the base, and the other end of the disc spring is fixedly connected to the side wall of the lower nut.

[0012] In a further technical solution, a ball joint seat is fixedly connected to the top of the adjusting screw, the adjusting ball is rotatably connected inside the ball joint seat, a damping plate is provided inside the ball joint seat, and the inner wall of the damping plate is attached to the surface of the adjusting ball.

[0013] In a further technical solution, a pressure ring is slidably connected inside the ball joint seat, a lead screw is rotatably connected inside the ball joint seat, a damping knob is fixedly connected to one end of the lead screw, the inner wall of the pressure ring is threadedly connected to the side wall of the lead screw, and the side wall of the pressure ring is in contact with the side wall of the damping plate.

[0014] In a further technical solution, a T-shaped slide rail is fixedly connected to the long edge of the base, a slider is slidably connected to the side wall of the T-shaped slide rail, a rubber pad is provided on the inner wall of the slider, the inner wall of the rubber pad fits against the side wall of the T-shaped slide rail, a locking knob is threadedly connected to the upper surface of the slider, one end of the locking knob is rotatably connected to the inside of the rubber pad, and a magnetic rubber strip is pasted on the side wall of the slider.

[0015] In a further technical solution, a laser engraving line is provided at the top of the adjusting screw, a fluorescent coating is provided around the outer periphery of the laser engraving line, and a wireless electronic digital display is provided inside the adjusting screw.

[0016] In a further technical solution, the diamond-shaped grid pattern formed at the bottom of the base has a grid unit side length of 20mm and a pattern height of 1.5mm, and the inside of the grid is filled with nitrile rubber particles with a particle size of 3-5mm.

[0017] In a further technical solution, the wireless electronic digital display includes a grating displacement sensor and a Bluetooth wireless transmission unit. The grating displacement sensor is disposed in the axial central hole of the adjusting screw, and the Bluetooth wireless transmission unit is encapsulated in the lower sealed cavity of the adjusting screw. The grating displacement sensor is electrically connected to the Bluetooth wireless transmission unit and is used to wirelessly transmit the collected displacement data to an external smart terminal.

[0018] This utility model has the following beneficial effects:

[0019] In this invention, the precast cover plate can be quickly and accurately controlled in terms of height and horizontal angle and placed stably through the double fixing of the diamond-shaped grid pattern of the base and the magnetic rubber strip, the precise height adjustment and locking of the adjusting screw and the elastic self-locking teeth, and the fine adjustment of the horizontal angle of the tray and the ball joint seat. This achieves the effect of high flatness and stable installation of the cover plate, solving the problems of poor flatness and easy loosening caused by unstable support and low adjustment accuracy during the installation of existing precast cover plates. The above structure improves the installation quality and efficiency of precast cover plates. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of an adjustable prefabricated cover plate placement and leveling device proposed in this utility model.

[0021] Figure 2 This is a side view of an adjustable prefabricated cover plate placement and leveling device proposed in this utility model.

[0022] Figure 3 This is a schematic diagram of the base of an adjustable prefabricated cover plate leveling device proposed in this utility model.

[0023] Figure 4This is a schematic diagram of the height adjustment component of an adjustable prefabricated cover plate placement and leveling device proposed in this utility model.

[0024] Figure 5 This is a schematic diagram of the horizontal adjustment component of an adjustable prefabricated cover plate placement and leveling device proposed in this utility model.

[0025] Figure 6 This is a schematic diagram of the ball joint seat of an adjustable prefabricated cover plate placement and leveling device proposed in this utility model.

[0026] Figure 7 for Figure 1 Enlarged view of point A in the middle.

[0027] Explanation of icon numbers:

[0028] 1. Base; 2. Adjusting screw; 3. Threaded hole; 4. Elastic self-locking tooth; 5. Upper nut; 6. Lower nut; 7. Disc spring; 8. Shaft pin sleeve; 9. Rotary handle; 10. Telescopic handle; 11. Pin; 12. Wireless electronic digital display; 13. Tray; 14. Annular water guide groove; 15. Adjusting ball; 16. Ball joint seat; 17. Damping plate; 18. Pressure ring; 19. Lead screw; 20. Damping knob; 21. T-shaped slide rail; 22. Slider; 23. Rubber pad; 24. Locking knob; 25. Magnetic rubber strip. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1 to 7 As shown, the present invention provides an adjustable prefabricated cover plate placement and leveling device, including a base 1. The base 1 is a plate-shaped structure used to fit and fix to the top placement surface of the drainage ditch. A height adjustment component is provided inside the base 1, and a horizontal adjustment component is provided on the side wall of the base 1.

[0031] The height adjustment assembly includes an adjusting screw 2 and a threaded hole 3. The threaded hole 3 is located inside the base 1 (it can be M20 specification, thread accuracy 6H, depth 50mm). The adjusting screw 2 is threaded into the threaded hole 3 (the adjusting screw 2 can be made of 40Cr material, diameter M20, pitch 2mm). The base 1 has a self-locking elastic tooth 4 located inside the threaded hole 3. The self-locking elastic tooth 4 is made of 65Mn spring steel and its function is to form a one-way engagement with the thread of the adjusting screw 2 through elastic deformation, achieving unlocking during adjustment and automatic locking when stationary. The tip of the self-locking elastic tooth 4 matches the thread profile of the adjusting screw 2, forming a one-way engagement structure. Figure 4 As shown, a shaft pin sleeve 8 is fixedly connected to the bottom of the adjusting screw 2. A rotating handle 9 is rotatably connected inside the shaft pin sleeve 8. A telescopic handle 10 is slidably connected inside the rotating handle 9. Multiple insertion holes are opened inside the telescopic handle 10. A pin 11 is slidably connected inside the rotating handle 9. The pin 11 cooperates with the insertion holes of the telescopic handle 10 to fix the length, thereby achieving the effect of adjusting the handle length within the range of 10-50cm. The length of the telescopic handle 10 can be adjusted by inserting the pin 11 into the insertion holes at different positions.

[0032] There are eight elastic self-locking teeth 4, which are evenly distributed circumferentially along the inner wall of the threaded hole 3 (the spacing between adjacent teeth is 45°, the thickness of each tooth is 1mm and the height is 2mm). The surface of the base 1 is sprayed with an epoxy resin coating to improve corrosion resistance and adapt to humid and salt spray environments. The bottom is formed by stamping a diamond-shaped grid pattern, and nitrile rubber particles are embedded in the grid to increase the friction with the drainage ditch support surface and prevent the base 1 from slipping. Specifically, the grid unit of the diamond-shaped grid pattern formed at the bottom of the base 1 has a side length of 20mm and a height of 1.5mm. The inside of the grid is filled with nitrile rubber particles with a particle size of 3-5mm to enhance the friction with the top support surface of the drainage ditch, prevent slippage, and improve the anti-slip stability of the structure in humid or oily environments.

[0033] like Figure 4 As shown, the adjusting screw 2 is threadedly connected to an upper nut 5 and a lower nut 6 on its side wall. The upper nut 5 is a lock nut with a nylon insert, located above the base 1. The lower nut 6 is a common hexagonal nut, located below the base 1. A disc spring 7 (65Mn material, 3 pieces combined, outer diameter 30mm, inner diameter 12mm) is sleeved on the side wall of the adjusting screw 2. One end of the disc spring 7 is fixedly connected to the bottom of the base 1, and the other end of the disc spring 7 is fixedly connected to the side wall of the lower nut 6. The upper nut 5, together with the lower nut 6 and the disc spring 7, locks and fixes the adjusting screw 2, thereby applying a continuous preload to resist the effects of foundation settlement or temperature deformation.

[0034] like Figure 7As shown, a T-shaped slide rail 21 is fixedly connected to the long edge of the base 1. A slider 22 (made of nylon 66 and glass fiber) is slidably connected to the side wall of the T-shaped slide rail 21. A rubber pad 23 (approximately 2mm thick) is provided on the inner wall of the slider 22. The inner wall of the rubber pad 23 fits against the side wall of the T-shaped slide rail 21. A locking knob 24 is threadedly connected to the upper surface of the slider 22. One end of the locking knob 24 is rotatably connected to the inside of the rubber pad 23. The locking knob 24, in conjunction with the rubber pad 23, positions the slider 22, achieving the effect of firmly fixing the slider 22 to the T-shaped slide rail 21. A magnetic rubber strip 25 is attached to the side wall of the slider 22 for adsorption with the steel reinforcement embedded parts at the edge of the drainage ditch, achieving the effect of quickly fixing the base 1 to the ditch.

[0035] The top of the adjusting screw 2 is equipped with laser-etched lines (0.1mm wide, 10mm long, and 0.05mm deep) to provide visual height markings in strong light environments and assist in judging the height effect. A fluorescent coating (using polytetrafluoroethylene fluorescent paint, 0.03mm thick) is set around the laser-etched lines to enhance the visibility of the markings in low light environments and improve the ease of operation. The adjusting screw 2 is equipped with a wireless electronic digital display 12 (including a high-precision grating displacement sensor and a Bluetooth 5.0 wireless transmission unit) to collect and transmit the height and height difference data of each support point to a smart terminal in real time, so as to achieve precise control.

[0036] Specifically, the wireless electronic digital display 12 includes a high-precision grating displacement sensor and a Bluetooth wireless transmission unit. The grating displacement sensor is disposed within the axial central hole of the adjusting screw 2, and the Bluetooth wireless transmission unit is encapsulated in the lower sealed cavity of the adjusting screw 2. After being paired with a smart terminal, the wireless electronic digital display 12 can synchronously display the real-time height data and relative deviations of multiple sets of adjustment points, realizing synchronous height difference leveling operations based on data visualization. The grating displacement sensor is electrically connected to the Bluetooth wireless transmission unit to wirelessly transmit the collected displacement data to an external smart terminal.

[0037] like Figure 5 and Figure 6As shown, the horizontal adjustment assembly includes a tray 13, located at the top of the adjusting screw 2, used to support the precast cover plate and provide stable support. An annular water channel 14 (5mm wide, 3mm deep, with the bottom of the channel inclined outwards at 2°) is provided inside the tray 13 to drain rainwater and prevent water accumulation from affecting the stability of the fit between the cover plate and the tray 13. An adjusting ball 15 is fixedly connected to the bottom of the tray 13, and a ball joint seat 16 is fixedly connected to the top of the adjusting screw 2. The adjusting ball 15 is rotatably connected inside the ball joint seat 16. The adjusting ball 15, in conjunction with the ball joint seat 16, rotates at multiple angles, achieving the effect of fine-tuning the horizontal angle of the precast cover plate. A damping plate 17 is provided inside the ball joint seat 16. The damping plate 17 is made of nitrile rubber (2mm thick, Shore A hardness 70±5), and its function is to... Friction is generated by the contact with the adjusting ball 15 to control the rotational resistance. The inner wall of the damping plate 17 is attached to the outer surface of the adjusting ball 15. A pressure ring 18 (1mm thick, 65Mn material) is slidably connected inside the ball joint seat 16. A lead screw 19 is rotatably connected inside the ball joint seat 16. A damping knob 20 is fixedly connected to one end of the lead screw 19. The inner wall of the pressure ring 18 is threaded to the side wall of the lead screw 19. The side wall of the pressure ring 18 is attached to the side wall of the damping plate 17. The damping knob 20, together with the lead screw 19 and the pressure ring 18, adjusts the pressure of the damping plate 17, achieving the effect of continuously adjusting the rotational resistance within the range of 1 to 6 N·m. The above structure combination forms a precise and controllable horizontal adjustment mechanism, which is convenient for quick coarse angle adjustment and can be stably locked after fine adjustment to ensure that the precast cover plate remains horizontal for a long time.

[0038] Its working principle is as follows: When using this device, the bottom of the base 1, through the diamond-shaped grid pattern formed by stamping and the embedded rubber particles, enhances the friction with the top resting surface of the drainage ditch, preventing the device from slipping; the 0.3mm thick epoxy resin coating on the surface improves corrosion resistance; the T-shaped slide rail 21 on the long edge of the base 1 cooperates with the slider 22, and the slider 22 can slide along the length of the T-shaped slide rail 21. By adjusting the position of the slider 22, it can be adapted to drainage ditches of different widths; after sliding into place, tighten the locking knob 24 on the slider 22 to make the rubber pad 23 fit tightly with the T-shaped slide rail 21 to achieve positioning; the magnetic rubber strip on the side wall of the slider 22 25. The device adheres to the steel reinforcement embedded in the edge of the drainage ditch, further fixing the base 1 and ensuring a stable fit between the device and the ditch. The height adjustment component adjusts the height of the precast cover plate by cooperating with the adjusting screw 2 and the threaded hole 3. By unfolding the rotating handle 9 at the bottom of the adjusting screw 2, pulling the telescopic handle 10, and inserting the pin 11 into different holes, the overall length of the handle is adjusted to form a lever that saves effort. Rotating the rotating handle 9 causes the adjusting screw 2 to rotate along the threaded hole 3, raising and lowering the top of the screw, thus adjusting the support height of the precast cover plate. There are eight elastic self-locking teeth 4 on the inner wall of the threaded hole 3, which are evenly distributed circumferentially and form a unidirectional engagement with the thread of the adjusting screw 2. During adjustment, the elastic self-locking tooth 4 is unlocked by the deformation of the thread thrust; when stationary, the tooth rebounds and engages with the thread, automatically locking the adjusting screw 2 to prevent loosening due to vibration; after adjustment, tighten the upper nut 5 and lower nut 6 on the adjusting screw 2, which, together with the disc spring 7 between them, generates a continuous preload, further strengthening the locking effect and resisting the effects of foundation settlement or temperature deformation. The laser engraving and fluorescent coating at the top of the adjusting screw 2 form a double mark to assist visual judgment of height; the built-in wireless electronic digital display 12 collects and transmits the height and height difference data of each support point to the construction personnel's smart terminal in real time, realizing precise control and horizontal adjustment. The component adjusts the horizontal angle of the prefabricated cover plate by cooperating with the tray 13 and the ball joint seat 16. The prefabricated cover plate is placed on the tray 13. The adjusting ball 15 at the bottom of the tray 13 can rotate in the ball joint seat 16 at the top of the adjusting screw 2 to achieve multi-angle fine adjustment in the horizontal direction. Rotating the damping knob 20 on the side of the ball joint seat 16 pushes the pressure ring 18 to squeeze the damping plate 17 through the screw 19, adjusting the contact pressure between the damping plate 17 and the adjusting ball 15, thereby controlling the rotation resistance and facilitating precise angle fixing. The annular water guide groove 14 on the upper surface of the tray 13 is inclined outward to quickly drain rainwater and avoid water accumulation affecting the contact stability between the cover plate and the tray 13.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., 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. An adjustable preformed cover plate resting flattening device comprising a base (1), characterised in that: The base (1) is provided with a height adjustment component inside, and the base (1) is provided with a horizontal adjustment component on its side wall; The height adjustment assembly includes an adjustment screw (2) and a threaded hole (3). The threaded hole (3) is opened inside the base (1). The side wall of the adjustment screw (2) is threadedly connected to the threaded hole (3). The base (1) is provided with an elastic self-locking tooth (4). The elastic self-locking tooth (4) is located inside the threaded hole (3). The top of the elastic self-locking tooth (4) matches the thread profile of the adjustment screw (2) to form a one-way meshing structure. The bottom of the adjustment screw (2) is fixedly connected with a shaft pin sleeve (8). The shaft pin sleeve (8) is rotatably connected to a rotating handle (9). The rotating handle (9) is slidably connected to a telescopic handle (10). The telescopic handle (10) is provided with multiple insertion holes. The rotating handle (9) is slidably connected to a pin (11). The length of the telescopic handle (10) is adjusted by inserting the pin (11) into the insertion holes at different positions.

2. An adjustable pre-cut cover sheet flattening device according to claim 1, wherein: The horizontal adjustment component includes a tray (13), which is located at the top of the adjusting screw (2). An annular water guide groove (14) is provided inside the tray (13), and an adjusting ball (15) is fixedly connected to the bottom of the tray (13).

3. An adjustable pre-cut cover plate laying flat device according to claim 1, wherein: There are eight elastic self-locking teeth (4), which are evenly distributed along the inner wall of the threaded hole (3). The surface of the base (1) is coated with epoxy resin, and the bottom is formed by stamping to form a diamond-shaped grid pattern.

4. The adjustable prefabricated cover plate placement and leveling device according to claim 1, characterized in that: The adjusting screw (2) has an upper nut (5) and a lower nut (6) threadedly connected to its side wall. The upper nut (5) is located above the base (1), and the lower nut (6) is located below the base (1). A disc spring (7) is sleeved on the side wall of the adjusting screw (2). One end of the disc spring (7) is fixedly connected to the bottom of the base (1), and the other end of the disc spring (7) is fixedly connected to the side wall of the lower nut (6).

5. The adjustable prefabricated cover plate placement and leveling device according to claim 2, characterized in that: The top end of the adjusting screw (2) is fixedly connected to a ball joint seat (16), and the adjusting ball (15) is rotatably connected inside the ball joint seat (16). A damping plate (17) is provided inside the ball joint seat (16), and the inner wall of the damping plate (17) is attached to the surface of the adjusting ball (15).

6. The adjustable prefabricated cover plate placement and leveling device according to claim 5, characterized in that: The ball joint seat (16) is slidably connected to a pressure ring (18), and the ball joint seat (16) is rotatably connected to a lead screw (19). One end of the lead screw (19) is fixedly connected to a damping knob (20). The inner wall of the pressure ring (18) is threadedly connected to the side wall of the lead screw (19), and the side wall of the pressure ring (18) is in contact with the side wall of the damping plate (17).

7. The adjustable prefabricated cover plate placement and leveling device according to claim 1, characterized in that: The base (1) has a T-shaped slide rail (21) fixedly connected to its long side edge. A slider (22) is slidably connected to the side wall of the T-shaped slide rail (21). A rubber pad (23) is provided on the inner wall of the slider (22). The inner wall of the rubber pad (23) fits against the side wall of the T-shaped slide rail (21). A locking knob (24) is threadedly connected to the upper surface of the slider (22). One end of the locking knob (24) is rotatably connected inside the rubber pad (23). A magnetic rubber strip (25) is pasted on the side wall of the slider (22).

8. The adjustable prefabricated cover plate placement and leveling device according to claim 1, characterized in that: The adjusting screw (2) has a laser engraving at its top end, and a fluorescent coating is arranged around the laser engraving. The adjusting screw (2) has a wireless electronic digital display (12) inside.

9. An adjustable prefabricated cover plate placement and leveling device according to claim 1, characterized in that: The bottom of the base (1) has a diamond-shaped grid pattern with a grid unit side length of 20mm and a pattern height of 1.5mm. The grid is filled with nitrile rubber particles with a particle size of 3-5mm.

10. An adjustable prefabricated cover plate placement and leveling device according to claim 8, characterized in that: The wireless electronic digital display (12) includes a grating displacement sensor and a Bluetooth wireless transmission unit. The grating displacement sensor is disposed in the axial central hole of the adjusting screw (2), and the Bluetooth wireless transmission unit is encapsulated in the lower sealed cavity of the adjusting screw (2). The grating displacement sensor is electrically connected to the Bluetooth wireless transmission unit and is used to wirelessly transmit the collected displacement data to an external smart terminal.

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