A wind turbine foundation concrete leveling device

Abstract

This application relates to a concrete smoothing device for wind power foundations, belonging to the technical field of concrete construction. It includes a support frame, a movable plate, an adjusting electric cylinder, a multi-stage telescopic electric cylinder, a power component, a smoothing component, and auxiliary components. The support frame is adjustable in size. The movable plate is connected to the power component. The adjusting electric cylinder and the multi-stage telescopic electric cylinder are both slidably connected to the movable plate. The multi-stage telescopic electric cylinder is connected to the movable end of the adjusting electric cylinder, and the movable end of the multi-stage telescopic electric cylinder is connected to the smoothing component. The power component drives the smoothing component to move, and the smoothing component smooths the concrete surface. The auxiliary components enable the smoothing component to move smoothly between adjacent support frames. The adjusting electric cylinder drives the smoothing component to smooth within a circular area, and the multi-stage telescopic electric cylinder drives the smoothing component to quickly change the smoothing area. This application improves the versatility and ease of use of the smoothing device.

Description

Technical Field

[0001] This application relates to the technical field of concrete construction, and in particular to a concrete leveling device for wind power foundations. Background Technology

[0002] Wind power foundations are typically reinforced concrete structures. After the concrete is poured, the surface needs to be smoothed before it sets. Since the surface of concrete is usually conical, it is difficult to use conventional concrete smoothing equipment. The only way to smooth it is by multiple people working manually at the same time.

[0003] To improve the construction efficiency of wind turbine foundation concrete, Chinese Patent No. CN210597357U discloses a surface smoothing device for wind turbine foundation concrete. The device is equipped with a first connecting ring, a second connecting ring, a track support rod, a slide rail, and an automatic smoothing device. The automatic smoothing device can move in a circular motion along the slide rail. During the circular motion, the automatic smoothing device can complete the smoothing operation on the surface of the wind turbine foundation concrete.

[0004] In the above solution, although mechanical smoothing replaces manual smoothing, the fixed dimensions of the first connecting ring, the second connecting ring, the track support rod, and the slide rail mean that the smoothing equipment can only be used on wind turbine foundations of fixed dimensions. The dimensions of wind turbine foundations usually need to be adjusted according to the wind turbine specifications and geological conditions. In addition, when the automatic smoothing device needs to change the smoothing area, a new slide rail needs to be rebuilt and the automatic smoothing device needs to be disassembled and installed on the new slide rail. Therefore, the above-mentioned smoothing equipment has the problems of poor versatility and inconvenience in use. Summary of the Invention

[0005] To improve the versatility and ease of use of leveling equipment, this application provides a wind power foundation concrete leveling device.

[0006] This application provides a concrete leveling device for wind turbine foundations, which adopts the following technical solution:

[0007] A wind power foundation concrete leveling device includes multiple ring-shaped support frames, a movable plate, an adjusting electric cylinder, and a multi-stage telescopic electric cylinder. Adjacent support frames can be detachably connected, and the size of the support frames is adjustable.

[0008] The movable plate is rotatably connected to a sliding block, and the sliding block is slidably connected to a sliding rail of adjustable length. Multiple sliding rails are provided and are connected one-to-one to the side of the support frame near the outer ring template of the foundation.

[0009] Both the adjusting electric cylinder and the multi-stage telescopic electric cylinder are slidably connected to the moving plate. The moving end of the multi-stage telescopic electric cylinder is connected to the adjusting electric cylinder. The moving end of the multi-stage telescopic electric cylinder is connected to a support slider. The support slider is slidably connected to a sliding support rod with an adjustable length. There are multiple sliding support rods, which are slidably set on the support frame in a one-to-one correspondence. Adjacent sliding support rods can be detachably connected.

[0010] The slider is connected to a power component for driving the slider to slide along the slide rail;

[0011] The support slider is connected to a smoothing component for smoothing concrete surfaces.

[0012] The regulating electric cylinder and the multi-stage telescopic electric cylinder are electrically connected to the central control unit. The regulating electric cylinder has multiple preset telescopic modes, and these multiple telescopic modes correspond one-to-one with the multi-stage telescopic states of the multi-stage telescopic electric cylinder under the control of the central control unit.

[0013] The movable plate is connected to a fixing component for securing the adjusting electric cylinder;

[0014] The supporting slider can rotate relative to the sliding support rod. An auxiliary component is provided on both the sliding block and the sliding support rod. The auxiliary component is used to fix the sliding block and the moving plate with a fixed force of a fixed magnitude, and to allow the supporting slider to continue sliding after rotating between two adjacent sliding support rods by a fixed angle. The fixed angle is twice the acute angle between the vertical plane where the adjusting electric cylinder is located and the vertical plane where the connection side of the adjacent support frame is located.

[0015] Optionally, the auxiliary component includes a fixing part, which includes a magnetic plate connected to the sliding block. The moving plate is made of ferromagnetic material, and the magnetic plate and the moving plate are magnetically connected.

[0016] Optionally, the auxiliary component includes an auxiliary part, which includes a baffle, a baffle plate, and a push plate. A support sliding hole is provided on the sliding rod, and a support slider is slidably disposed in the support sliding hole and can rotate in the support sliding hole. The baffle is hinged in a clearance groove provided on the side wall of the support sliding hole. The baffle is located on the side of the support sliding hole near the outer ring template of the foundation. The baffle can be completely swung into the clearance groove. A first torsion spring is provided between the baffle and the sliding rod. The first torsion spring is used to drive the baffle to block the support sliding hole.

[0017] The baffle is slidably installed on the wall of the supporting sliding hole and located on the side of the supporting sliding hole away from the outer ring template of the foundation. The baffle is used to prevent the baffle from swinging into the relief groove. The push plate is connected to the baffle. An auxiliary spring is provided between the push plate and the sliding support rod to drive the baffle into the supporting sliding hole. Multiple push rods are connected to the supporting slider, and the push rods correspond one-to-one with the push plate.

[0018] The push plate has a clearance notch for the push rod to slide through. A clearance plate is provided at the clearance notch. The clearance plate is hinged to the push plate. A limiting plate is provided on the side of the clearance plate away from the support sliding hole. The limiting plate is connected to the push plate. A second torsion spring is provided between the clearance plate and the push plate. The second torsion spring is used to drive the clearance plate to abut against the limiting plate.

[0019] The push rod is used to push the corresponding relief plate away from the baffle when the support slider rotates, so that the baffle slides out of the support slide hole. The length of the baffle is less than the length of the push plate, so that the support slider can slide past the baffle first and then past the push plate.

[0020] Optionally, both the adjusting electric cylinder and the multi-stage telescopic electric cylinder are connected to adjusting sliders. The adjusting sliders are slidably disposed in adjusting holes opened on the moving plate. The adjusting sliders are made of ferromagnetic material, and the fixing component is a first electromagnet. When the adjusting slider slides to one end of the adjusting hole near the sliding block, the adjusting slider is directly opposite the first electromagnet. The first electromagnet is electrically connected to the central control unit. The central control unit is used to control the first electromagnet to be energized when the adjusting electric cylinder is telescopic, and the central control unit is used to control the first electromagnet to be de-energized when the adjusting electric cylinder stops telescopic.

[0021] Optionally, the smoothing assembly includes a connecting part and a smoothing part. The connecting part includes a smoothing telescopic rod and a compression spring. The smoothing telescopic rod is connected to the support slider. The movable end of the smoothing telescopic rod is connected to the smoothing part. The compression spring is set on the smoothing telescopic rod and is always in a compressed state. The compression spring is used to drive the smoothing telescopic rod to extend so that the smoothing part is always in contact with the surface of the concrete. The smoothing part is used to smooth the surface of the concrete.

[0022] Optionally, the smoothing unit includes a first mounting box, a smoothing motor, a smoothing turntable, a smoothing plate, and a surface-applying spring. The first mounting box is hinged to the movable end of the smoothing telescopic rod, and the hinge between the first mounting box and the movable end of the smoothing telescopic rod can be fixed. The smoothing motor is connected to the first mounting box, the smoothing turntable is connected to the output shaft of the smoothing motor, and multiple smoothing plates are arranged around the output shaft of the smoothing motor. All the smoothing plates are arranged in a radiating pattern, and one end of the smoothing plate near the center of the smoothing turntable is hinged to the smoothing turntable. The edge of the smoothing plate is arc-shaped and raised. Multiple surface-applying springs are provided, and each corresponds to one of the smoothing plates. The surface-applying springs are located between the smoothing plate and the smoothing turntable, and are used to drive the smoothing plate to smooth the surface of the concrete.

[0023] Optionally, the smoothing assembly further includes a coarse smoothing section, which is provided in multiple ways and corresponds one-to-one with the smoothing plate. The coarse smoothing section includes a coarse smoothing slide bar, a coarse smoothing sheet, and a connecting plate. There are multiple coarse smoothing slide bars, all of which are slidably connected to one side of the smoothing plate. There are multiple coarse smoothing sheets, which are connected one-to-one to the end of the coarse smoothing slide bar near the concrete. The connecting plate is connected to all the coarse smoothing slide bars. When the connecting plate is moved so that all the coarse smoothing sheets are inserted into the concrete surface, the coarse smoothing sheets can flip over the concrete surface smoothed by their corresponding smoothing plate.

[0024] Optionally, a coarse trowel spring is provided between the connecting plate and the troweling plate. The coarse trowel spring is used to drive the connecting plate to move the coarse trowel away from the concrete surface. The connecting plate is made of ferromagnetic material. A second electromagnet is connected to the troweling plate. The energized second electromagnet is used to attract the connecting plate so that the coarse trowel is inserted into the concrete surface.

[0025] Optionally, both the smoothing motor and the second electromagnet are connected to the central control unit. When the smoothing motor starts, the central control unit controls the second electromagnet to be energized. After each section of the multi-stage telescopic electric cylinder extends, the central control unit controls the second electromagnet to be energized. The time the second electromagnet is energized is equal to the time it takes for the sliding block to slide one revolution along all the sliding rails.

[0026] Optionally, the sliding rail restricts the sliding block from rotating relative to itself. The power assembly includes a second mounting box, a power motor, a power gear, and a power rack. The second mounting box is connected to the sliding block, the power motor is connected to the second mounting box, the power gear is connected to the output shaft of the power motor, the power gear meshes with the power rack, the length of the power rack is adjustable, multiple power racks are provided, and they are connected one-to-one on the sliding rail. The power gear can mesh and transmit power between two adjacent power racks.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] This application discloses a concrete smoothing device for wind turbine foundations, comprising a support frame, a movable plate, an adjusting electric cylinder, a multi-stage telescopic electric cylinder, a power component, a smoothing component, and auxiliary components. The support frame is adjustable in size, allowing multiple support frames to be installed on wind turbine foundations of different diameters by adjusting their dimensions, thus improving the versatility of the smoothing device. The power component and auxiliary components work together to enable the smoothing component to move smoothly between the multiple support frames. With stroke compensation from the adjusting electric cylinder, the smoothing component can smooth the concrete surface within a circular area. Driven by the multi-stage telescopic electric cylinder, the smoothing component can quickly change the circular area being smoothed, improving the ease of use of the smoothing device. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0030] Figure 2 This is a structural diagram of the supporting frame;

[0031] Figure 3 This is a structural schematic diagram of the power assembly;

[0032] Figure 4 This is a structural diagram of the auxiliary section;

[0033] Figure 5 This is a structural diagram of the smoothing component;

[0034] Figure 6 This is a structural diagram showing the assembly relationship between the sliding rail and the power rack.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Support frame; 11. Central frame; 12. Edge frame; 13. Connecting rod; 2. Moving plate; 21. Sliding block; 22. Sliding rail; 23. Adjusting slide hole; 24. First electromagnet; 3. Adjusting electric cylinder; 31. Adjusting slider; 32. Central control unit; 4. Multi-stage telescopic electric cylinder; 41. Support slider; 411. Push rod; 42. Sliding support rod; 421. Supporting slide hole; 422. Clearance groove; 423. Spring groove; 5. Power assembly; 51. Second mounting box; 52. Power motor; 53. Power gear; 54. Power rack; 6. Smoothing assembly; 61. Connecting part; 611. Smoothing telescopic rod; 6111. Connecting support plate; 612. Pressing... 62. Smoothing section; 621. First mounting box; 6211. Connecting block; 622. Smoothing motor; 623. Smoothing turntable; 624. Smoothing plate; 625. Surface spring; 63. Coarse smoothing section; 631. Coarse smoothing slide bar; 632. Coarse smoothing plate; 633. Connecting plate; 634. Coarse smoothing spring; 635. Second electromagnet; 7. Auxiliary components; 71. Fixing section; 711. Magnetic plate; 72. Auxiliary section; 721. Baffle; 7211. First torsion spring; 722. Baffle plate; 723. Push plate; 7231. Auxiliary spring; 7232. Clearance notch; 7233. Clearance plate; 7234. Limiting plate; 7235. Second torsion spring. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0038] This application discloses a concrete leveling device for wind turbine foundations. (Refer to...) Figure 1 and Figure 2 A wind power foundation concrete leveling device includes a support frame 1, a movable plate 2, an adjusting electric cylinder 3, and a multi-stage telescopic electric cylinder 4.

[0039] Six support frames 1 are arranged around the perimeter, and two adjacent support frames 1 are bolted together. The six support frames 1 form a regular hexagon. The support frame 1 includes a central frame 11, an edge frame 12 and a connecting rod 13.

[0040] Both the center frame 11 and the edge frame 12 are rectangular. The lengths of the two long sides of both the center frame 11 and the edge frame 12 are adjustable to accommodate the diameters of the concrete center and edge formwork. One adjustable long side of the center frame 11 is bolted to the concrete center formwork, and one adjustable long side of the edge frame 12 is bolted to the concrete edge formwork. Two adjustable connecting rods 13 are provided, located at the ends of the other adjustable long sides of the center frame 11 and the edge frame 12, respectively. The ends of the connecting rods 13 are ball-jointed to the center frame 11 and the edge frame 12 to accommodate the heights of the concrete center and edge formwork.

[0041] The movable plate 2 is rotatably connected to a sliding block 21, which is slidably connected to an adjustable sliding rail 22. Six sliding rails 22 are provided, each corresponding to one of the support frame 1. The sliding rails 22 are fixed to the adjustable long side of the edge frame 12 near the concrete. The length adjustment of the sliding rails 22 is adapted to the length adjustment of the adjustable long side of the edge frame 12. The sliding block 21 can slide between two adjacent sliding rails 22. In this embodiment, the ends of the sliding rails 22 are rounded to allow the sliding block 21 to slide from one sliding rail 22 to another adjacent sliding rail 22 via the arc-shaped track.

[0042] Reference Figures 1-3 Both the adjusting electric cylinder 3 and the multi-stage telescopic electric cylinder 4 are slidably connected to the moving plate 2. The moving end of the multi-stage telescopic electric cylinder 4 is connected to the moving end of the adjusting electric cylinder 3. The adjusting electric cylinder 3 is set at the template near the edge of the concrete, and the multi-stage telescopic electric cylinder 4 is set at the template near the center of the concrete. The moving end of the multi-stage telescopic electric cylinder 4 is fixedly connected to a support slider 41. The support slider 41 is slidably connected to a sliding support rod 42 with adjustable length. Multiple sliding support rods 42 are provided, and each corresponds to one of the support frame 1. Adjacent sliding support rods 42 are bolted together. The two ends of the sliding support rod 42 are slidably connected to two connecting rods 13 respectively. The support slider 41 can slide between two adjacent sliding support rods 42.

[0043] Reference Figure 1 and Figure 2 In this embodiment, three movable plates 2 and three sliding blocks 21 are provided. The movable plates 2 and the sliding blocks 21 correspond one-to-one. The movable plates 2 are evenly arranged around the central template of the concrete. Three adjusting electric cylinders 3 and three multi-stage telescopic electric cylinders 4 are provided, and they correspond one-to-one with the movable plates 2. The evenly arranged multi-stage telescopic electric cylinders 4 can drive the six sliding support rods 42 to slide synchronously on the connecting rod 13 more stably.

[0044] Specifically, refer to Figure 2 In this embodiment, the adjustable long side of the center frame 11, the adjustable long side of the edge frame 12, the connecting rod 13, the sliding rail 22, and the sliding support rod 42 all adopt a three-section telescopic structure. The two side sections of the three-section telescopic structure can slide and extend relative to the middle section, and the side sections of the three-section telescopic structure can be fixed by bolts after sliding relative to the middle section.

[0045] Reference Figure 2 and Figure 3 The sliding block 21 is connected to a power component 5, which is used to drive the sliding block 21 to slide along the sliding rail 22; the support slider 41 is connected to a smoothing component 6, which is used to smooth the surface of the concrete as it moves with the support slider 41.

[0046] Reference Figure 1 and Figure 3 The regulating electric cylinder 3 and the multi-stage telescopic electric cylinder 4 are electrically connected to a central control unit 32. The regulating electric cylinder 3 has multiple preset telescopic modes, each corresponding to a different telescopic state of the multi-stage telescopic electric cylinder 4. The central control unit 32 switches the telescopic mode of the regulating electric cylinder 3 when the multi-stage telescopic electric cylinder 4 extends. For each stage of extension of the multi-stage telescopic electric cylinder 4, the regulating electric cylinder 3 adjusts to a different telescopic mode, ensuring that the support slider 41 always moves along an arc trajectory. The extension stroke of the regulating electric cylinder 3 compensates for the distance difference between the arc trajectory of the support slider 41 and the straight trajectory of the sliding block 21. The multiple telescopic modes of the regulating electric cylinder 3 can be preset via the central control unit 32 based on the dimensions of the wind turbine foundation and the speed at which the power component 5 drives the sliding block 21.

[0047] Reference Figure 3 The movable plate 2 is connected to a fixing member. When the adjusting electric cylinder 3 extends or retracts, the fixing member fixes the adjusting electric cylinder 3 and the movable plate 2 so that the adjusting electric cylinder 3 can stably drive the smoothing component 6 to move on the concrete surface. When the adjusting electric cylinder 3 stops extending or retracting, the fixing member releases the fixing of the adjusting electric cylinder 3 and the movable plate 2 so that the adjusting electric cylinder 3 can slide relative to the movable plate 2.

[0048] Reference Figure 3 and Figure 4 The supporting slider 41 can rotate relative to the sliding support rod 42. The sliding block 21 and the sliding support rod 42 are jointly provided with an auxiliary component 7. The auxiliary component 7 includes a fixing part 71 and an auxiliary part 72. The fixing part 71 is provided on the sliding block 21 and is used to fix the sliding block 21 and the moving plate 2 with a fixed fixing force.

[0049] Six auxiliary parts 72 are provided, one for each of the sliding support rods 42. Each auxiliary part 72 is positioned near the end of the support slider 41 that slides into the sliding support rod 42. The auxiliary parts 72 are used to allow the support slider 41 to rotate a fixed angle between two adjacent sliding support rods 42 and continue sliding. The fixed angle is twice the acute angle between the vertical plane containing the adjusting electric cylinder 3 and the vertical plane containing the connecting rod 13. In this embodiment, the fixed angle of rotation of the support slider 41 is 60 degrees.

[0050] When the support slider 41 slides between two adjacent sliding rods 42, the power component 5 can drive the moving plate 2 to rotate relative to the sliding block 21. After the support slider 41 rotates 60 degrees, the support slider 41 can slide on the next sliding rod 42 so that the support slider 41 and the sliding block 21 slide synchronously on the same support frame 1. When the support slider 41 and the sliding block 21 slide synchronously, the extension and retraction direction of the adjusting electric cylinder 3 can be perpendicular to the sliding direction of the sliding block 21. The fixing part 71 and the auxiliary part 72 cooperate to enable the moving plate 2 and the multi-stage telescopic electric cylinder 4 to move smoothly from one support frame 1 to another adjacent support frame 1.

[0051] In use, the overall size of the support frame 1 is adjusted according to the size of the wind power foundation so that the six support frames 1 can be bolted around and fitably installed on the template of the wind power foundation. Since the size of the support frame 1 can be adjusted, the smoothing device can be installed on wind power foundations of different sizes to smooth the concrete surface of wind power foundations of different diameters, thus improving the versatility of the smoothing device.

[0052] After the support frame 1 is installed, the power component 5 can drive the sliding block 21 to slide along the sliding rail 22. Under the fixing force of the fixing part 71, the sliding block 21 can drive the moving plate 2 to move linearly. The moving plate 2 can drive the support slider 41 to slide on the sliding support rod 42 through the adjusting electric cylinder 3 and the multi-stage telescopic electric cylinder 4. The support slider 41 can drive the smoothing component 6 to move in contact with the concrete surface. After the sliding block 21 slides one revolution, the smoothing component 6 can smooth an annular area of ​​the concrete surface.

[0053] When the support slider 41 slides between two adjacent sliding rods 42, the auxiliary part 72 can first prevent the support slider 41 from sliding into the next sliding rod 42. Due to the blocking effect of the auxiliary part 72, the driving force of the power component 5 to drive the sliding block 21 to slide can be greater than the fixing force applied by the fixing part 71, so that the moving plate 2 can rotate relative to the sliding block 21, so that the sliding block 21 can continue to slide along the sliding rail 22, and so that the moving plate 2 can drive the support slider 41 to rotate.

[0054] During the rotation of the support slider 41 by 60 degrees, the adjusting electric cylinder 3 stops extending and retracting, and the fixing part releases the fixing of the adjusting electric cylinder 3 and the moving plate 2. The adjusting electric cylinder 3 can slide relative to the moving plate 2 to compensate for the increased distance between the support slider 41 and the sliding block 21. After the support slider 41 has rotated 60 degrees, the auxiliary part 72 can release the obstruction of the support slider 41, so that the support slider 41 and the sliding block 21 can slide synchronously on a support frame 1. At this time, the fixing part fixes the adjusting electric cylinder 3 and the moving plate 2, so that the adjusting electric cylinder 3 can stably drive the smoothing component 6 to move, thereby allowing the sliding block 21 and the support slider 41 to move from one support frame 1 to another adjacent support frame 1.

[0055] The adjusting electric cylinder 3 extends and retracts cyclically during the movement of the sliding block 21 to drive the support slider 41 to move in an arc trajectory. The support slider 41 drives the smoothing component 6 to move in an arc, so that the annular area smoothed by the smoothing component 6 is annular, and the smoothing area of ​​the smoothing component 6 can be adapted to the circular wind power foundation.

[0056] When it is necessary to change the smoothing area, the multi-stage telescopic electric cylinder 4 extends one section, and the multi-stage telescopic electric cylinder 4 drives the support slider 41 and the smoothing component 6 to move towards the center of the concrete, so that the smoothing component 6 can smooth the area adjacent to the smoothed area. At the same time, the central control unit 32 can control the adjustment electric cylinder 3 to switch to the next telescopic mode to adapt to the compensation requirements of the arc trajectory of the support slider 41 in the adjacent area.

[0057] Based on the above analysis, the adjustable support frame 1 enables the smoothing device to be adapted to wind power foundations of different sizes. By adjusting the position of the smoothing component 6 through telescopic means, the smoothing component 6 can not only smooth out a circular area, but also easily replace the smoothing area, thereby improving the versatility and ease of use of the smoothing device.

[0058] Specifically, refer to Figure 3 The fixing part 71 includes a magnetic plate 711, which is fixedly connected to the sliding block 21. The moving plate 2 is made of ferromagnetic material, and the magnetic plate 711 and the moving plate 2 are magnetically connected. The magnetic attraction between the magnetic plate 711 and the moving plate 2 forms a fixing force between the moving plate 2 and the sliding block 21. When the external force between the moving plate 2 and the sliding block 21 is not greater than the magnetic attraction force, the moving plate 2 and the sliding block 21 can remain fixed. When the external force between the moving plate 2 and the sliding block 21 is greater than the magnetic attraction force, the moving plate 2 and the sliding block 21 can rotate relative to each other, so that a fixing force of fixed magnitude can be formed between the moving plate 2 and the sliding block 21.

[0059] Specifically, refer to Figure 4 The auxiliary part 72 includes a baffle 721, a baffle plate 722 and a push plate 723.

[0060] Reference Figures 2-4 A support sliding hole 421 is provided on the sliding support rod 42, and a support slider 41 is slidably disposed in the support sliding hole 421 and can rotate within the support sliding hole 421. A baffle 721 is hinged in a clearance groove 422 provided on the side wall of the support sliding hole 421. The baffle 721 is located on the side of the support sliding hole 421 near the edge frame 12. The baffle 721 can be fully inserted into the clearance groove 422 so that the support slider 41 can slide towards the middle of the sliding support rod 42. A first torsion spring 7211 is fixed between the baffle 721 and the sliding support rod 42. The first torsion spring 7211 is located at the hinge of the baffle 721 and is used to drive the baffle 721 to block the support sliding hole 421.

[0061] A baffle plate 722 slides through the wall of the supporting sliding hole 421 and is located on the side of the supporting sliding hole 421 away from the edge bracket 12. The baffle plate 722 is used to prevent the baffle plate 721 from swinging into the relief groove 422. The push plate 723 is fixedly connected to the baffle plate 722. An auxiliary spring 7231 is fixed between the push plate 723 and the sliding support rod 42 to drive the baffle plate 722 into the supporting sliding hole 421. The auxiliary spring 7231 is located in the spring groove 423 opened on the sliding support rod 42. Six push rods 411 are fixedly connected to the supporting slider 41, and each push rod 411 corresponds to a push plate 723.

[0062] Reference Figure 4 The push plate 723 has a clearance notch 7232 for the push rod 411 to slide through. A clearance plate 7233 is provided at the clearance notch 7232. The clearance plate 7233 is hinged to the push plate 723. A limiting plate 7234 is provided on the side of the clearance plate 7233 away from the supporting sliding hole 421. The limiting plate 7234 is fixed to the push plate 723. A second torsion spring 7235 is fixed between the clearance plate 7233 and the push plate 723. The second torsion spring 7235 is located at the hinge of the clearance plate 7233. The second torsion spring 7235 is used to drive the clearance plate 7233 to abut against the limiting plate 7234.

[0063] Reference Figure 3 and Figure 4 The push rod 411 is used to push the corresponding relief plate 7233 away from the baffle 721 when the support slider 41 rotates, so that the baffle 722 slides out of the support sliding hole 421. The length of the baffle 721 is less than the length of the push plate 723, so that the support slider 41 can slide past the baffle 721 and then past the push plate 723, so that the baffle 721 can return to its original position before the baffle 722.

[0064] When the support slider 41 slides between two adjacent sliding rods 42, the push rod 411 can push the relief plate 7233 to swing and slide past the relief plate 7233. The baffle 721 can prevent the support slider 41 from sliding into the next sliding rod 42 under the blocking action of the baffle 722. Under the drive of the power component 5 to the sliding block 21, the support slider 41 can rotate with the moving plate 2. The push rod 411 can gradually approach the relief plate 7233. After the support slider 41 rotates 60 degrees, the push rod 411 can push the relief plate 7233 away from the baffle 721. Under the action of the limiting plate 7234, the relief plate 7233 drives the push plate 723 away from the baffle 721. The push plate 723 can drive the baffle 722 to slide out of the support sliding hole 421. At this time, the support slider 41 can slide synchronously with the sliding block 21 on a support frame 1. The support slider 41 can push the baffle 721 to rotate into the relief groove 422.

[0065] After the support slider 41 slides past the baffle 721, the support slider 41 still pushes the push plate 723 with the push rod 411 to prevent the baffle 722 from resetting. At this time, the baffle 721 can be reset first under the elastic force of the first torsion spring 7211. After the support slider 41 slides past the push plate 723, the push rod 411 releases the pushing force on the push plate 723. At this time, the baffle 722 is reset under the elastic force of the auxiliary spring 7231. Thus, the baffle 721 and the baffle 722 can not only prevent the support slider 41 from sliding directly into the next sliding support rod 42, but also allow the baffle 721 and the baffle 722 to automatically reset to their original state.

[0066] Specifically, refer to Figure 1 and Figure 3 Both the adjusting electric cylinder 3 and the multi-stage telescopic electric cylinder 4 are fixedly connected to adjusting sliders 31. The adjusting sliders 31 are slidably disposed within the adjusting sliding holes 23 opened on the moving plate 2. The adjusting sliders 31 are made of ferromagnetic material. The fixing component is a first electromagnet 24, which is fixedly connected to the moving plate 2. When the adjusting slider 31 slides to the end of the adjusting sliding hole 23 near the sliding block 21, the adjusting slider 31 is directly opposite the first electromagnet 24. The first electromagnet 24 is electrically connected to the central control unit 32. The central control unit 32 is used to control the first electromagnet 24 to be energized when the adjusting electric cylinder 3 is telescopic, and to control the first electromagnet 24 to be de-energized when the adjusting electric cylinder 3 stops telescopic.

[0067] When the adjusting electric cylinder 3 extends and retracts to drive the smoothing component 6 to move, the central control unit 32 can control the first electromagnet 24 to be energized. The energized first electromagnet 24 can magnetically fix the adjusting slider 31, so that the adjusting electric cylinder 3 is fixed relative to the moving plate 2, so that the adjusting electric cylinder 3 can stably drive the smoothing component 6 to move. When the adjusting electric cylinder 3 stops extending and retracting to switch the sliding rail 22 of the sliding block 21, the central control unit 32 can control the first electromagnet 24 to be de-energized, so that the adjusting electric cylinder 3 can slide relative to the moving plate 2 to compensate for the increased distance between the support slider 41 and the sliding block 21.

[0068] Specifically, refer to Figure 5 The smoothing component 6 includes a connecting part 61 and a smoothing part 62. The connecting part 61 includes a smoothing telescopic rod 611 and a compression spring 612.

[0069] The smoothing telescopic rod 611 is fixedly connected to the support slider 41. The movable end of the smoothing telescopic rod 611 is connected to the smoothing part 62. The compression spring 612 is set in the rodless cavity of the smoothing telescopic rod 611. The two ends of the compression spring 612 are fixedly connected to the fixed end and the movable end of the smoothing telescopic rod 611, respectively. The compression spring 612 is always in a compressed state. The compression spring 612 is used to drive the smoothing telescopic rod 611 to extend so that the smoothing part 62 is always in contact with the concrete surface. The smoothing part 62 is used to smooth the concrete surface. Since the compression spring 612 is always compressed, it can drive the smoothing telescopic rod 611 with elastic force to always press the smoothing part 62 against the concrete surface, so that the smoothing part 62 can conform to the conical surface of the concrete for smoothing.

[0070] Specifically, refer to Figure 5 The smoothing section 62 includes a first mounting box 621, a smoothing motor 622, a smoothing turntable 623, a smoothing plate 624, and a surface spring 625.

[0071] The first mounting box 621 is hinged to the movable end of the smoothing telescopic rod 611, and the hinge between the first mounting box 621 and the movable end of the smoothing telescopic rod 611 can be fixed. The smoothing motor 622 is fixedly connected to the first mounting box 621. The smoothing turntable 623 is fixedly connected to the output shaft of the smoothing motor 622. Multiple smoothing plates 624 are evenly arranged around the output shaft of the smoothing motor 622. All smoothing plates 624 are arranged in a radiating pattern. The end of the smoothing plate 624 closest to the center of the smoothing turntable 623 is hinged to the smoothing turntable 623. The edges of the smoothing plates 624 are arc-shaped and raised to prevent them from scraping the concrete surface during rotation. Multiple surface-adhesive springs 625 are provided, corresponding one-to-one with the smoothing plates 624. The surface-adhesive springs 625 are fixed between the smoothing plates 624 and the smoothing turntable 623, and are used to drive the smoothing plates 624 to smooth the concrete surface.

[0072] The first mounting box 621 is fixedly connected to a connecting block 6211, and the movable end of the smoothing telescopic rod 611 is fixedly connected to a connecting support plate 6111. Bolts are passed through the connecting block 6211 and the connecting support plate 6111, and nuts are fitted on the bolts. When the nuts are loosened, the first mounting box 621 can rotate relative to the movable end of the smoothing telescopic rod 611. When the nuts are tightened, the first mounting box 621 can be fixed relative to the movable end of the smoothing telescopic rod 611.

[0073] Because the first mounting box 621 is hinged to the movable end of the smoothing telescopic rod 611, the smoothing turntable 623 connected to the output shaft of the smoothing motor 622 can adapt and rotate to the conical surface of the concrete, so that the smoothing turntable 623 can face the conical surface of the concrete, thereby allowing the smoothing plate 624 to abut against the conical surface of the concrete. Tighten the nut to fix the connecting block 6211 and the connecting support plate 6111, the smoothing motor 622 drives the smoothing turntable 623 to rotate, the smoothing turntable 623 drives the smoothing plate 624 to rotate, and under the elastic force of the surface spring 625, the smoothing plate 624 can swing relative to the smoothing turntable 623 with the conical surface of the concrete, thereby allowing the smoothing turntable 623 to conform to the conical surface of the concrete for smoothing.

[0074] Reference Figure 5 In order to improve the smoothing effect of the concrete surface, the smoothing component 6 also includes a coarse trowel 63. Multiple coarse trowels 63 are provided and correspond one-to-one with the trowel plate 624. The coarse trowel 63 includes a coarse trowel slide bar 631, a coarse trowel 632 and a connecting plate 633.

[0075] Multiple coarse troweling rods 631 are provided, and each is slidably connected to one side of the troweling plate 624. Multiple coarse troweling pieces 632 are provided, and each is fixedly connected to the end of the coarse troweling rod 631 near the concrete. A connecting plate 633 is fixedly connected to all the coarse troweling rods 631. When the connecting plate 633 is moved so that all the coarse troweling pieces 632 are inserted into the concrete surface, the coarse troweling pieces 632 can flip over the concrete surface that has been troweled by their corresponding troweling plate 624.

[0076] When it is necessary to rough-finish the concrete surface, move the connecting plate 633 so that all the rough-finishing slide bars 631 slide down, so that all the rough-finishing trowels 632 can be inserted into the concrete surface, allowing the rough-finishing trowels 632 to turn over the concrete surface, so that the concrete surface can be evenly distributed, thereby helping to improve the smoothing effect of the concrete surface.

[0077] Reference Figure 5In order to control the up and down movement of the connecting plate 633, a coarse trowel spring 634 is fixed between the connecting plate 633 and the troweling plate 624. The coarse trowel spring 634 is used to drive the connecting plate 633 to move the coarse trowel 632 away from the concrete surface, so that the coarse trowel 632 can be detached from the concrete surface. The connecting plate 633 is made of ferromagnetic material, and a second electromagnet 635 is fixed on the troweling plate 624. The energized second electromagnet 635 is used to attract the connecting plate 633 so that the coarse trowel 632 can be inserted into the concrete surface, so that the coarse trowel 632 can turn the concrete surface.

[0078] By coarse trowel spring 634 and second electromagnet 635 working together, the connecting plate 633 can be controlled to move up or down. When the second electromagnet 635 is de-energized, the connecting plate 633 can move up with the coarse trowel piece 632 under the elastic force of the coarse trowel spring 634. When the second electromagnet 635 is energized, the connecting plate 633 can move down with the coarse trowel piece 632 under the magnetic attraction force, making the up and down movement of the connecting plate 633 easy to control.

[0079] Reference Figure 1 , Figure 3 and Figure 5 In order to automatically adapt the power on / off status of the second electromagnet 635 to the operation of the squeegee 624, both the squeegee motor 622 and the second electromagnet 635 are electrically connected to the central control unit 32. When the squeegee motor 622 starts, the central control unit 32 controls the second electromagnet 635 to be powered on. After the multi-stage telescopic electric cylinder 4 extends one section, the central control unit 32 controls the second electromagnet 635 to be powered on. The time for the second electromagnet 635 to be powered on is equal to the time for the sliding block 21 to slide one revolution along all the sliding rails 22.

[0080] In the initial state, when the smoothing motor 622 starts to drive the smoothing plate 624 to rotate, the central control unit 32 can control the second electromagnet 635 to be energized. The energized second electromagnet 635 can magnetically drive the connecting plate 633 to move downward, so that the coarse trowel 632 is inserted into the concrete surface. This allows the smoothing plate 624 to first drive the coarse trowel 632 to perform coarse troweling. After the sliding block 21 slides one revolution along the sliding rail 22, that is, after the coarse trowel 632 on the smoothing plate 624 has completed the full circle of coarse troweling, the second electromagnet 635 will automatically... When the power is off, the coarse trowel spring 634 can drive the connecting plate 633 to move upward through its elastic force, so that the coarse trowel 632 can detach from the concrete surface, allowing the troweling plate 624 to perform fine troweling. When the multi-stage telescopic electric cylinder 4 extends one section to drive the troweling plate 624 to smooth the adjacent area, the central control unit 32 will control the second electromagnet 635 to be energized again, so that the coarse trowel 632 can be inserted into the concrete surface again. This allows the concrete surface to be coarsely troweled first and then finely troweled during the initial troweling, improving the smoothing effect of the concrete surface.

[0081] Specifically, refer to Figure 3The power assembly 5 includes a second mounting box 51, a power motor 52, a power gear 53, and a power rack 54.

[0082] The sliding rail 22 restricts the sliding block 21 from rotating relative to itself. Three of each are provided: a second mounting box 51, a power motor 52, and a power gear 53, each corresponding to one of the sliding blocks 21. The second mounting box 51 is fixed to the sliding block 21, the power motor 52 is fixed to the second mounting box 51, and the power gear 53 is fixed to the output shaft of the power motor 52, meshing with a power rack 54. The length of the power rack 54 is adjustable. Multiple power racks 54 are provided, each corresponding to one of the sliding rails 22. The length adjustment of the power rack 54 is adapted to the length adjustment of the sliding rail 22. The power gear 53 can mesh and transmit power between adjacent power racks 54.

[0083] Reference Figure 2 , Figure 3 and Figure 6 In this embodiment, the end of the power rack 54 is rounded so that the power gear 53 can mesh and drive from one power rack 54 to another adjacent power rack 54. The power rack 54 is composed of three racks, one of which is fixed to the middle section of the slide rail 22, and the other two racks are fixed to the two side sections of the slide rail 22 respectively. The rack on the middle section is slidably connected to the rack on the side section, and the power gear 53 can mesh and drive from the rack on the middle section to the rack on the side section.

[0084] When it is necessary to drive the sliding block 21 to slide, the power motor 52 is started. The power motor 52 can drive the power gear 53 to rotate. Since the sliding rail 22 restricts the rotation of the sliding block 21 relative to itself, the sliding block 21 can only slide within the sliding rail 22. Thus, the power motor 52 can drive the sliding block 21 to slide through the meshing of the power gear 53 and the power rack 54. Since there is a circular transition between the two adjacent power racks 54 and the two adjacent sliding rails 22, the power gear 53 can transmit power to the other adjacent power rack 54. The sliding block 21 can slide to the other adjacent sliding rail 22 under the drive of the power gear 53, so that the sliding block 21 can slide a full circle along the sliding rail 22.

[0085] The implementation principle of the wind power foundation concrete smoothing device in this application embodiment is as follows: In use, the size of each support frame 1 is adjusted so that the six support frames 1 can be adapted to be installed on the wind power foundation. The power motor 52 drives the sliding block 21 to slide in the sliding rail 22. The sliding block 21 drives the moving plate 2, the adjusting electric cylinder 3, the multi-stage telescopic electric cylinder 4 and the support slider 41 to move. The support slider 41 drives the smoothing component 6 to move. During the movement, the smoothing component 6 smooths the concrete surface. With the cooperation of the fixing part 71 and the auxiliary part 72, the smoothing component 6 can move in a full circle. With the stroke compensation of the adjusting electric cylinder 3, the smoothing component 6 can smooth within the circular area. When it is necessary to smooth adjacent areas, the multi-stage telescopic electric cylinder 4 can drive the smoothing component 6 to move directly, so that the smoothing component 6 can quickly change the smoothing area, thereby improving the versatility and ease of use of the smoothing equipment.

[0086] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A concrete leveling device for wind turbine foundations, characterized in that: It includes multiple ring-shaped support frames (1), a movable plate (2), an adjusting electric cylinder (3) and a multi-stage telescopic electric cylinder (4). Two adjacent support frames (1) can be detachably connected, and the size of the support frame (1) is adjustable. The movable plate (2) is rotatably connected to a sliding block (21), and the sliding block (21) is slidably connected to a sliding rail (22) with adjustable length. Multiple sliding rails (22) are provided and are connected one-to-one to the side of the support frame (1) near the outer ring template of the foundation. The adjusting electric cylinder (3) and the multi-stage telescopic electric cylinder (4) are slidably connected to the moving plate (2). The multi-stage telescopic electric cylinder (4) is connected to the movable end of the adjusting electric cylinder (3). The movable end of the multi-stage telescopic electric cylinder (4) is connected to a support slider (41). The support slider (41) is slidably connected to a sliding support rod (42) with adjustable length. There are multiple sliding support rods (42), and they are slidably set on the support frame (1) one by one. Adjacent sliding support rods (42) can be detachably connected. The sliding block (21) is connected to a power assembly (5) for driving the sliding block (21) to slide along the sliding rail (22); The support slider (41) is connected to a smoothing component (6) for smoothing the concrete surface; The regulating electric cylinder (3) and the multi-stage telescopic electric cylinder (4) are electrically connected to the central control unit (32). The regulating electric cylinder (3) has multiple telescopic modes preset, and the multiple telescopic modes correspond one-to-one with the multi-stage telescopic states of the multi-stage telescopic electric cylinder (4) under the control of the central control unit (32). The movable plate (2) is connected to a fixing part for fixing the adjusting electric cylinder (3); The support slider (41) can rotate relative to the sliding support rod (42). The sliding block (21) and the sliding support rod (42) are jointly provided with an auxiliary component (7). The auxiliary component (7) is used to fix the sliding block (21) and the moving plate (2) with a fixed force of a fixed size, and to make the support slider (41) continue to slide after rotating between two adjacent sliding support rods (42) by a fixed angle. The fixed angle is twice the acute angle between the vertical plane where the adjusting electric cylinder (3) is located and the vertical plane where the connection side of the adjacent support frame (1) is located.

2. The wind turbine foundation concrete leveling device according to claim 1, characterized in that: The auxiliary component (7) includes a fixing part (71), which includes a magnetic plate (711). The magnetic plate (711) is connected to the sliding block (21). The moving plate (2) is made of ferromagnetic material, and the magnetic plate (711) and the moving plate (2) are magnetically connected.

3. The wind turbine foundation concrete leveling device according to claim 1, characterized in that: The auxiliary component (7) includes an auxiliary part (72), which includes a baffle (721), a baffle plate (722), and a push plate (723). A support sliding hole (421) is provided on the sliding rod (42). The support slider (41) is slidably disposed in the support sliding hole (421) and can rotate in the support sliding hole (421). The baffle (721) is hinged in the clearance groove (422) opened on the side wall of the support sliding hole (421). The baffle (721) is located on the side of the support sliding hole (421) close to the outer ring template of the foundation. The baffle (721) can be completely inserted into the clearance groove (422). A first torsion spring (7211) is provided between the baffle (721) and the sliding rod (42). The first torsion spring (7211) is used to drive the baffle (721) to block the support sliding hole (421). The baffle (722) slides through the hole wall of the support sliding hole (421) and is located on the side of the support sliding hole (421) away from the outer ring template of the foundation. The baffle (722) is used to prevent the baffle (721) from being inserted into the relief groove (422). The push plate (723) is connected to the baffle (722). An auxiliary spring (7231) is provided between the push plate (723) and the sliding support rod (42) to drive the baffle (722) to slide into the support sliding hole (421). Multiple push rods (411) are connected to the support slider (41), and the push rods (411) correspond one-to-one with the push plate (723). The push plate (723) has a clearance notch (7232) for the push rod (411) to slide through. A clearance plate (7233) is provided at the clearance notch (7232). The clearance plate (7233) is hinged to the push plate (723). A limiting plate (7234) is provided on the side of the clearance plate (7233) away from the supporting sliding hole (421). The limiting plate (7234) is connected to the push plate (723). A second torsion spring (7235) is provided between the clearance plate (7233) and the push plate (723). The second torsion spring (7235) is used to drive the clearance plate (7233) to abut against the limiting plate (7234). The push rod (411) is used to push the corresponding relief plate (7233) away from the baffle (721) when the support slider (41) rotates, so that the baffle (722) slides out of the support slide hole (421). The length of the baffle (721) is less than the length of the push plate (723), so that the support slider (41) can slide past the baffle (721) and then slide past the push plate (723).

4. The wind turbine foundation concrete leveling device according to claim 1, characterized in that: Both the regulating electric cylinder (3) and the multi-stage telescopic electric cylinder (4) are connected to regulating sliders (31). The regulating sliders (31) are slidably disposed in the regulating sliding holes (23) opened on the moving plate (2). The regulating sliders (31) are made of ferromagnetic material and the fixing component is the first electromagnet (24). When the regulating sliders (31) slide to the end of the regulating sliding hole (23) close to the sliding block (21), the regulating sliders (31) are directly opposite the first electromagnet (24). The first electromagnet (24) is electrically connected to the central control unit (32). The central control unit (32) is used to control the first electromagnet (24) to be energized when the regulating electric cylinder (3) is telescopic, and the central control unit (32) is used to control the first electromagnet (24) to be de-energized when the regulating electric cylinder (3) stops telescopic.

5. A wind turbine foundation concrete leveling device according to claim 1, characterized in that: The smoothing component (6) includes a connecting part (61) and a smoothing part (62). The connecting part (61) includes a smoothing telescopic rod (611) and a compression spring (612). The smoothing telescopic rod (611) is connected to the support slider (41). The movable end of the smoothing telescopic rod (611) is connected to the smoothing part (62). The compression spring (612) is set on the smoothing telescopic rod (611) and is always in a compressed state. The compression spring (612) is used to drive the smoothing telescopic rod (611) to extend so that the smoothing part (62) is always in contact with the surface of the concrete. The smoothing part (62) is used to smooth the surface of the concrete.

6. A wind turbine foundation concrete leveling device according to claim 5, characterized in that: The smoothing section (62) includes a first mounting box (621), a smoothing motor (622), a smoothing turntable (623), a smoothing plate (624), and a surface-applying spring (625). The first mounting box (621) is hinged to the movable end of the smoothing telescopic rod (611), and the hinge between the first mounting box (621) and the movable end of the smoothing telescopic rod (611) can be fixed. The smoothing motor (622) is connected to the first mounting box (621), the smoothing turntable (623) is connected to the output shaft of the smoothing motor (622), and the smoothing plate (624) rotates around the smoothing section. The output shaft of the flat motor (622) is provided with multiple trowels, and all the trowels (624) are arranged in a radiating pattern. The end of the trowel (624) near the center of the troweling turntable (623) is hinged to the troweling turntable (623). The edge of the trowel (624) is curved and raised. Multiple surface springs (625) are provided, and each corresponds to one of the trowels (624). The surface springs (625) are located between the trowel (624) and the troweling turntable (623). The surface springs (625) are used to drive the trowel (624) to smooth the surface of the concrete.

7. A wind turbine foundation concrete leveling device according to claim 6, characterized in that: The smoothing component (6) also includes a coarse smoothing section (63). Multiple coarse smoothing sections (63) are provided and correspond one-to-one with the smoothing plate (624). The coarse smoothing section (63) includes a coarse smoothing slide bar (631), a coarse smoothing piece (632), and a connecting plate (633). Multiple coarse smoothing slide bars (631) are provided and are all slidably connected to one side of the smoothing plate (624). Multiple coarse smoothing pieces (632) are provided and are connected one-to-one to the end of the coarse smoothing slide bar (631) near the concrete. The connecting plate (633) is connected to all the coarse smoothing slide bars (631). When the connecting plate (633) is moved so that all the coarse smoothing pieces (632) are inserted into the concrete surface, the coarse smoothing pieces (632) can flip over the concrete surface smoothed by their corresponding smoothing plate (624).

8. A wind turbine foundation concrete leveling device according to claim 7, characterized in that: A coarse trowel spring (634) is provided between the connecting plate (633) and the trowel plate (624). The coarse trowel spring (634) is used to drive the connecting plate (633) to move the coarse trowel piece (632) away from the concrete surface. The connecting plate (633) is made of ferromagnetic material. A second electromagnet (635) is connected to the trowel plate (624). The energized second electromagnet (635) is used to attract the connecting plate (633) so that the coarse trowel piece (632) is inserted into the concrete surface.

9. A wind turbine foundation concrete leveling device according to claim 8, characterized in that: The smoothing motor (622) and the second electromagnet (635) are both electrically connected to the central control unit (32). When the smoothing motor (622) is started, the central control unit (32) controls the second electromagnet (635) to be energized. After the multi-stage telescopic electric cylinder (4) extends one section, the central control unit (32) controls the second electromagnet (635) to be energized. The time for the second electromagnet (635) to be energized is equal to the time for the sliding block (21) to slide one revolution along all the sliding rails (22).

10. A wind turbine foundation concrete leveling device according to claim 1, characterized in that: The sliding rail (22) restricts the sliding block (21) from rotating relative to itself. The power assembly (5) includes a second mounting box (51), a power motor (52), a power gear (53), and a power rack (54). The second mounting box (51) is connected to the sliding block (21). The power motor (52) is connected to the second mounting box (51). The power gear (53) is connected to the output shaft of the power motor (52). The power gear (53) meshes with the power rack (54). The length of the power rack (54) is adjustable. Multiple power racks (54) are provided and are connected to the sliding rail (22) one by one. The power gear (53) can mesh and transmit power between two adjacent power racks (54).

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