Trestle capable of being used for tunnel waterproof construction

Abstract

The trestle bridge capable of being used for tunnel waterproof construction comprises a main bridge, longitudinal moving guide rails are arranged on the two transverse sides of the main bridge, a moving trolley is arranged on the longitudinal moving guide rails, the moving trolley is connected with an operation platform, and a winding drum, a pressing mechanism and a mechanical arm are arranged on the operation platform. The movable trolley drives the working platform, the winding drum, the pressing mechanism and the mechanical arm on the working platform to move in the longitudinal direction, constructors operate on the working platform, waterproof coiled materials such as geotechnical cloth and waterproof plates can be arranged on the winding drum, manual lifting and carrying are not needed, the labor intensity of the constructors and the operation difficulty are reduced, use is safer and more convenient, and the construction efficiency is improved. After the geotechnical cloth and the waterproof plate are pulled out of the winding drum and the installation positions are determined, the pressing mechanism can press the geotechnical cloth and the waterproof plate on the side wall to avoid falling off, the nail gun, the pressure welding mechanism and the creeping welding machine are sequentially installed on the mechanical arm, the mechanical arm is used for driving the construction tool to move to complete the corresponding working procedures, and the automation degree of waterproof roll construction is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction equipment, and particularly to a trestle that can be used for tunnel waterproof construction. Background Art

[0002] In the current tunnel construction, the laying of the waterproof board on the side wall of the tunnel is the key to tunnel waterproofing, and the construction quality of the waterproof board is crucial for the overall waterproof effect of the tunnel. The side wall waterproof board is often laid longitudinally. In the past, most of the construction methods for the waterproof board were using inclined ladders, directly building platforms, etc. Due to the large arc and steep slope at the connection part between the side wall and the inverted arch, there are the following defects in building the operation platform: 1. When laying, it is necessary to manually lift and lay the waterproof board, resulting in high labor intensity, large operation difficulty and high safety risk for construction workers, thus affecting the construction quality of the side wall waterproofing; 2. The waterproof board cannot be fixed in time and is prone to falling off, greatly affecting the subsequent fixing work; 3. The laying of the waterproof board cannot achieve accurate positioning and installation; 4. The function of the operation platform is relatively single, only providing a standing platform for construction workers. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a trestle that can be used for tunnel waterproof construction, which has a high degree of automation, is easy to use, and is beneficial to improving construction efficiency and quality.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A trestle that can be used for tunnel waterproof construction includes a main bridge. Longitudinal moving rails are arranged on both lateral sides of the main bridge. A moving trolley is arranged on the longitudinal moving rails. The moving trolley is connected with an operation platform. A reel for placing the waterproof coiled material, a pressing mechanism for pressing the waterproof coiled material against the tunnel side wall, and a robotic arm for installing the construction tools of the waterproof coiled material are arranged on the operation platform.

[0006] As a further improvement of the above technical solution: The reel, the pressing mechanism and the robotic arm are arranged in sequence longitudinally.

[0007] As a further improvement of the above technical solution: A guiding roller and a plurality of supporting rollers are arranged between the reel and the robotic arm. The guiding roller and the reel are both arranged vertically, the supporting rollers are arranged horizontally, and the plurality of supporting rollers are arranged at intervals longitudinally.

[0008] As a further improvement of the above technical solution: A first limiting member is arranged in parallel on one side of the guiding roller. There is a gap between the first limiting member and the guiding roller for the waterproof coiled material to pass through;

[0009] And / or, the supporting roller is located on the side of the working platform away from the main bridge, and a second limiting member is provided at one end of the supporting roller away from the working platform.

[0010] As a further improvement of the above technical solution: the pressing mechanism includes a pressing bracket and a pressing roller provided on the pressing bracket, and the pressing bracket is hinged to the working platform to realize up-and-down flipping; or, the pressing bracket is slidably connected to the working platform.

[0011] As a further improvement of the above technical solution: the drum is hinged to the working platform to realize up-and-down flipping.

[0012] As a further improvement of the above technical solution: a lifting seat and a lifting driving member for driving the lifting of the lifting seat are provided on the working platform, and the drum is provided on the lifting seat.

[0013] As a further improvement of the above technical solution: guide posts are provided on the lifting seat, and guide sleeves are provided on the working platform, and the guide posts are inserted into the guide sleeves.

[0014] As a further improvement of the above technical solution: a liftable auxiliary platform is provided on the working platform, the auxiliary platform and the drum are respectively arranged at the longitudinal two ends of the working platform, and the robotic arm is detachably arranged on the auxiliary platform.

[0015] As a further improvement of the above technical solution: a first mounting seat is provided on the mobile trolley, a second mounting seat is provided between the first mounting seat and the working platform, a first telescopic driving member and a first link assembly are provided between the first mounting seat and the second mounting seat, one end of the first telescopic driving member is hinged to the first mounting seat, and the other end is hinged to the second mounting seat, and the first link assembly includes two first links arranged in parallel, one end of the first link is hinged to the first mounting seat, and the other end is hinged to the second mounting seat;

[0016] As a further improvement of the above technical solution: a second telescopic driving member and a second link assembly are provided between the second mounting seat and the working platform, one end of the second telescopic driving member is hinged to the second mounting seat, and the other end is hinged to the working platform, and the second link assembly includes two second links arranged in parallel, one end of the second link is hinged to the second mounting seat, and the other end is hinged to the working platform.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The trestle for tunnel waterproof construction disclosed by the present invention has a mobile trolley that can drive the operation platform and the drum, pressing mechanism, robotic arm, etc. thereon to move longitudinally as a whole without affecting the passage of other vehicles and construction equipment on the main bridge. Construction workers can operate on the operation platform, and waterproof rolls such as geotextiles and waterproof boards can be arranged on the drum, thus eliminating the need for manual lifting and handling, which helps reduce the labor intensity and operation difficulty of construction workers, making it safer and more convenient to use. After the geotextile and waterproof board are pulled out from the drum and their installation positions are determined, the pressing mechanism can press them against the side wall to prevent them from falling off. By successively installing construction tools such as nail guns, pressure welding mechanisms, and crawler welders on the robotic arm and using the robotic arm to drive the construction tools to move to complete the corresponding processes, the automation degree of waterproof roll construction can be significantly improved, which is conducive to improving construction efficiency and quality, and at the same time reducing the number of construction workers required.

[0019] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. Brief Description of the Drawings

[0020] Figure 1 is the front view structural schematic diagram of the trestle for tunnel waterproof construction of the present invention.

[0021] Figure 2 is the three-dimensional structural schematic diagram of the operation platform in the present invention.

[0022] Figure 3 is the front view structural schematic diagram of the operation platform in the present invention.

[0023] Figure 4 is the top view structural schematic diagram of the operation platform in the present invention.

[0024] Figure 5 is the top view structural schematic diagram when laying geotextiles in the present invention.

[0025] Figure 6 is the top view structural schematic diagram when fixing geotextiles in the present invention.

[0026] Figure 7 is the top view structural schematic diagram when laying waterproof boards in the present invention.

[0027] Figure 8 is the top view structural schematic diagram when welding waterproof boards in the present invention.

[0028] Figure 9 is the top view structural schematic diagram when welding the circumferential seam of waterproof boards in the present invention.

[0029] Each label in the figure represents:

[0030] 1. Main bridge; 11. Longitudinal movement guide rail; 2. Moving trolley; 21. First mounting seat; 22. Second mounting seat; 23. First telescopic driving member; 24. First link assembly; 241. First link; 25. Second telescopic driving member; 26. Second link assembly; 261. Second link; 3. Working platform; 31. Drum; 32. Pressing mechanism; 321. Pressing bracket; 322. Pressing roller; 33. Robot arm; 34. Guide roller; 341. First limiting member; 35. Support roller; 351. Second limiting member; 36. Lifting seat; 361. Guide post; 37. Guide sleeve; 38. Auxiliary platform; 4. Waterproof coiled material; 5. Nail gun; 6. Pressure welding mechanism; 7. Crawler welder. Detailed implementation mode

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly defined and limited, the terms "assembly", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0035] Figures 1 to 4An embodiment of the trestle that can be used for tunnel waterproof construction according to the present invention is shown. The trestle that can be used for tunnel waterproof construction in this embodiment includes a main bridge 1. Longitudinal moving guide rails 11 are provided on both lateral sides of the main bridge 1. A moving trolley 2 is provided on the longitudinal moving guide rails 11. The moving trolley 2 is connected with an operation platform 3. A reel 31 for placing a waterproof coiled material 4, a pressing mechanism 32 for pressing the waterproof coiled material 4 against the tunnel side wall, and a robotic arm 33 for installing construction tools for the waterproof coiled material 4 are provided on the operation platform 3. Among them, the lateral direction is the width direction of the tunnel, Figure 1 which is the left-right direction in the figure. Correspondingly, the longitudinal direction is the length direction of the tunnel, Figure 1 which is the direction perpendicular to the paper surface in the figure; preferably, the robotic arm 33 adopts a robotic arm with multiple rotational degrees of freedom, which is convenient for driving the movement of construction tools.

[0036] For the trestle that can be used for tunnel waterproof construction in this embodiment, the moving trolley 2 can drive the operation platform 3 and the reel 31, the pressing mechanism 32, the robotic arm 33, etc. thereon to move longitudinally as a whole, and does not affect the passage of other vehicles and construction equipment on the main bridge 1. Construction workers can operate on the operation platform 3. Waterproof coiled materials 4 such as geotextiles and waterproof boards can be arranged on the reel 31, so there is no need for manual lifting and handling, which is beneficial to reducing the labor intensity and operation difficulty of construction workers, and is safer and more convenient to use. After the geotextile and waterproof board are pulled out from the reel 31 and the installation position is determined, the pressing mechanism 32 can press them against the side wall to prevent them from falling off. By successively installing construction tools such as a nail gun 5, a pressure welding mechanism 6, and a welding machine 7 on the robotic arm 33 and using the robotic arm 33 to drive the construction tools to move to complete the corresponding processes, the automation degree of the construction of the waterproof coiled material 4 can be greatly improved, which is beneficial to improving the construction efficiency and quality, and at the same time reducing the number of construction workers required.

[0037] Specifically refer to Figure 2 and Figure 4 , in this embodiment, the reel 31, the pressing mechanism 32, and the robotic arm 33 are arranged longitudinally in sequence. After the waterproof coiled material 4 is pulled out from the reel 31 and the laying position is determined, the pressing mechanism 32 presses the waterproof coiled material 4 against the side wall to prevent it from falling off, and then the robotic arm 33 drives the construction tools to construct. The overall layout is reasonable and the structure is compact.

[0038] Further, in this embodiment, a guiding roller 34 and a plurality of supporting rollers 35 are provided between the winding drum 31 and the robotic arm 33. The guiding roller 34 and the winding drum 31 are both arranged vertically, and the supporting rollers 35 are arranged horizontally. The plurality of supporting rollers 35 are arranged at intervals longitudinally. The guiding roller 34 can provide a guiding effect for the waterproof coiled material 4, which helps to determine the position of the pulled-out waterproof coiled material 4 and avoid unnecessary movement. The plurality of supporting rollers 35 can provide support for the waterproof coiled material 4, facilitating the pulling out of the waterproof coiled material 4 and preventing it from dropping downward. Moreover, the guiding roller 34 and the supporting rollers 35 can rotate around their own axes driven by the waterproof coiled material 4, which is beneficial to reducing the frictional resistance when the waterproof coiled material 4 is pulled out. The structure is reasonable and effective. Preferably, the guiding roller 34 and the supporting rollers 35 are arranged between the winding drum 31 and the pressing mechanism 32. After the waterproof coiled material is pulled out a certain length along the guiding roller 34 and the supporting rollers 35, it is pressed by the pressing mechanism 32, and the layout is reasonable.

[0039] Further, in this embodiment, a first limiting member 341 is arranged in parallel on one side of the guiding roller 34. There is a gap between the first limiting member 341 and the guiding roller 34 for the waterproof coiled material 4 to pass through. Preferably, the first limiting member 341 can be, for example, a limiting roller, which can better limit the position of the waterproof coiled material 4 and avoid unnecessary movement.

[0040] And / or, the supporting roller 35 is located on the side of the working platform 3 away from the main bridge 1. A second limiting member 351 is provided at one end of the supporting roller 35 away from the working platform 3. Preferably, the second limiting member 351 can be, for example, a limiting plate, a limiting rod, etc., and the second limiting member 351 does not rotate with the supporting roller 35 (for example, a support rod is arranged on the working platform 3, and the second limiting member 351 is fixedly arranged on the support rod, and the supporting roller 35 is rotatably sleeved on the support rod), which can better limit the position of the waterproof coiled material 4 and avoid unnecessary movement.

[0041] Further, in this embodiment, the pressing mechanism 32 includes a pressing bracket 321 and a pressing roller 322 arranged on the pressing bracket 321. The pressing bracket 321 can be hinged to the working platform 3 to achieve up-and-down flipping; the pressing bracket 321 can also be slidably connected to the working platform 3 to achieve telescoping (for example, the guide sleeve 37 cooperates with the guide post 361, or the slide rail cooperates with the slider and the roller, etc.), and both can achieve the purpose of pressing the pulled-out waterproof coiled material 4. Moreover, when the pressing roller 322 contacts the waterproof coiled material 4, it can rotate around its own axis, thereby reducing the frictional resistance with the waterproof coiled material 4 and avoiding deformation and damage of the waterproof coiled material 4. The structure is reasonable and effective.

[0042] Furthermore, in this embodiment, the drum 31 is hinged to the working platform 3 to achieve upside-down flipping. Since the waterproofing coiled material 4 is high and heavy, when installing it on the drum 31, the drum 31 can be flipped to a horizontal state first, thereby greatly reducing the difficulty of installation, and can be installed manually without the aid of lifting equipment. After the waterproofing coiled material 4 is installed on the drum 31, the drum 31 is flipped to a vertical state, which is convenient for laying, and the structure is simple and effective.

[0043] See Figure 3 In this embodiment, the work platform 3 is provided with a lifting seat 36 and a lifting drive member (not shown in the figure, for example, it can be a cylinder, an electric cylinder, a gear rack mechanism, etc., which will not be described in detail) for driving the lifting seat 36 to rise and fall, and the reel 31 is arranged on the lifting seat 36. The lifting drive member can be used to drive the lifting seat 36 and the reel 31 to rise and fall as a whole, thereby fine-tuning the height of the waterproof roll 4, and getting closer to the laying position of the geotextile and the waterproof board.

[0044] Furthermore, in this embodiment, a guide column 361 is provided on the lifting seat 36, and a guide sleeve 37 is provided on the working platform 3, and the guide column 361 is inserted into the guide sleeve 37. The guide sleeve 37 cooperates with the guide column 361 to provide a guide for the lifting of the lifting seat 36, so that the lifting process is more stable and smooth.

[0045] Furthermore, in this embodiment, a liftable auxiliary platform 38 is provided on the working platform 3, the auxiliary platform 38 and the reel 31 are respectively provided at the longitudinal ends of the working platform 3, and the mechanical arm 33 is detachably provided on the auxiliary platform 38. If necessary, the mechanical arm 33 on the auxiliary platform 38 can also be removed, and the construction personnel stand on the auxiliary platform 38 and adjust the height through lifting and lowering movements, so as to get closer to the area requiring manual operation, thereby further improving convenience.

[0046] See Figure 1 and Figure 2 In this embodiment, a first mounting seat 21 is provided on the mobile trolley 2, a second mounting seat 22 is provided between the first mounting seat 21 and the working platform 3, a first telescopic driving member 23 (such as a cylinder, an oil cylinder, an electric cylinder, etc.) and a first connecting rod assembly 24 are provided between the first mounting seat 21 and the second mounting seat 22, one end of the first telescopic driving member 23 is hinged to the first mounting seat 21, and the other end is hinged to the second mounting seat 22, the first connecting rod assembly 24 includes two first connecting rods 241 arranged in parallel, one end of the first connecting rod 241 is hinged to the first mounting seat 21, and the other end is hinged to the second mounting seat 22;

[0047] A second telescopic driving member 25 (such as a cylinder, an oil cylinder, an electric cylinder, etc.) and a second link assembly 26 are provided between the second mounting base 22 and the working platform 3. One end of the second telescopic driving member 25 is hinged to the second mounting base 22, and the other end is hinged to the working platform 3. The second link assembly 26 includes two second links 261 arranged in parallel. One end of the second link 261 is hinged to the second mounting base 22, and the other end is hinged to the working platform 3.

[0048] The telescopic movement of the first telescopic driving member 23 can drive the second mounting base 22 to lift and move horizontally at the same time, while the first link assembly 24 can maintain the attitude of the second mounting base 22 during the movement and prevent it from tipping over; the telescopic movement of the second telescopic driving member 25 can drive the working platform 3 to lift and move horizontally at the same time, while the second link assembly 26 can maintain the attitude of the working platform 3 during the movement and prevent it from tipping over, enabling the working platform 3 to have two-stage lifting and horizontal movement functions, facilitating driving the working platform 3 close to the construction positions of the geotextile and the waterproof board ( Figure 1 In the figure, the working platform 3 on the left is in a folded and contracted state, and the working platform 3 on the right is in an extended state for waterproof construction), with a reasonable structure.

[0049] The construction method of the trestle for tunnel waterproof construction of the present invention is as follows:

[0050] Specifically refer to Figure 5 , laying the geotextile: First, install the geotextile on the reel 31. Through the telescopic movement of the first telescopic driving member 23 and the second telescopic driving member 25, the working platform 3 is moved close to the installation position of the geotextile. After the geotextile is pulled out and in place, the pressing mechanism 32 presses the geotextile against the side wall.

[0051] Specifically refer to Figure 6 , install a nail gun on the robotic arm 33, and use the assembly composed of a hot melt gasket, a metal gasket, and a nail to fix the geotextile. The hot melt gaskets are arranged in a plum blossom pattern, and the geotextile is fixed by nails in sequence. A laser locator can be used to ensure the uniform position of the geotextile on the shotcrete surface, making the geotextile closely attached. The laying should be smooth, without bulges or wrinkles.

[0052] Specifically refer to Figure 7 , laying the waterproof board: The reel 31 is flipped to the horizontal state, and it is convenient for workers to insert the waterproof board coil. After the waterproof board coil is installed, the reel 31 is flipped upward to the vertical state or continues to tilt slightly at a certain angle towards the tunnel side wall. The construction workers pull out the waterproof board along the guiding roller 34 and the supporting roller 35 to lay the waterproof board.

[0053] Specifically refer to Figure 8, replace the nail gun 5 on the robotic arm 33 with a pressure welding mechanism 6. Use an automatic electrothermal fusion welder to heat and pressure weld each hot melt gasket. An insulating cushion layer can be used between the welder and the waterproof board to prevent damage to the waterproof board during heating, and weld the waterproof board to the hot melt gasket that fixes the geotextile.

[0054] Specifically refer to Figure 9 , after fixing the waterproof board, replace the pressure welding mechanism 6 on the robotic arm 33 with a crawler welder 7. Adjust the height of the robotic arm 33 up and down, and use an automatic crawler welder to weld the circumferential seam of the waterproof board.

[0055] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A trestle bridge that can be used for tunnel waterproof construction, including a main bridge (1), characterized in that: On both lateral sides of the main bridge (1), longitudinal movement guide rails (11) are provided. A moving trolley (2) is arranged on the longitudinal movement guide rails (11). The moving trolley (2) is connected to an operation platform (3). On the operation platform (3), a reel (31) for placing a waterproof coiled material (4), a pressing mechanism (32) for pressing the waterproof coiled material (4) against the tunnel side wall, and a robotic arm (33) for installing construction tools of the waterproof coiled material (4) are provided.

2. The trestle bridge for tunnel waterproof construction according to claim 1, characterized in that: The reel (31), the pressing mechanism (32) and the robotic arm (33) are arranged in sequence along the longitudinal direction.

3. The trestle for tunnel waterproof construction according to claim 1, characterized in that: A guiding roller (34) and a plurality of supporting rollers (35) are arranged between the reel (31) and the robotic arm (33). The guiding roller (34) and the reel (31) are both arranged vertically. The supporting rollers (35) are arranged horizontally. The plurality of supporting rollers (35) are arranged at intervals along the longitudinal direction.

4. The trestle bridge for tunnel waterproof construction according to claim 3, characterized in that: A first limiting member (341) is arranged in parallel on one side of the guiding roller (34). A gap is formed between the first limiting member (341) and the guiding roller (34) for the waterproof coiled material (4) to pass through. And / or, the supporting rollers (35) are located on the side of the operation platform (3) away from the main bridge (1). A second limiting member (351) is arranged at one end of the supporting roller (35) away from the operation platform (3).

5. The trestle for tunnel waterproof construction according to claim 1, characterized in that: The pressing mechanism (32) includes a pressing support (321) and a pressing roller (322) arranged on the pressing support (321). The pressing support (321) is hinged to the operation platform (3) to realize up-and-down flipping; or, the pressing support (321) is slidably connected to the operation platform (3).

6. The trestle bridge usable for tunnel waterproof construction according to claim 1, characterized in that: The reel (31) is hinged to the operation platform (3) to realize up-and-down flipping.

7. The trestle for tunnel waterproof construction according to claim 1, characterized in that: An elevating seat (36) and an elevating driving member for driving the elevating seat (36) to elevate are arranged on the operation platform (3). The reel (31) is arranged on the elevating seat (36).

8. The trestle bridge for tunnel waterproof construction according to claim 7, characterized in that: Guide posts (361) are arranged on the elevating seat (36). Guide sleeves (37) are arranged on the operation platform (3). The guide posts (361) are inserted into the guide sleeves (37).

9. The trestle for tunnel waterproof construction according to any one of claims 1 to 8, characterized in that: A liftable auxiliary platform (38) is arranged on the operation platform (3). The auxiliary platform (38) and the reel (31) are respectively arranged at the longitudinal two ends of the operation platform (3). The robotic arm (33) is detachably arranged on the auxiliary platform (38).

10. The trestle bridge applicable to tunnel waterproof construction according to any one of claims 1 to 8, characterized in that: A first mounting seat (21) is provided on the moving trolley (2). A second mounting seat (22) is provided between the first mounting seat (21) and the working platform (3). A first telescopic driving member (23) and a first link assembly (24) are provided between the first mounting seat (21) and the second mounting seat (22). One end of the first telescopic driving member (23) is hinged to the first mounting seat (21), and the other end is hinged to the second mounting seat (22). The first link assembly (24) includes two first links (241) arranged in parallel. One end of the first link (241) is hinged to the first mounting seat (21), and the other end is hinged to the second mounting seat (22). A second telescopic driving member (25) and a second link assembly (26) are provided between the second mounting seat (22) and the working platform (3). One end of the second telescopic driving member (25) is hinged to the second mounting seat (22), and the other end is hinged to the working platform (3). The second link assembly (26) includes two second links (261) arranged in parallel. One end of the second link (261) is hinged to the second mounting seat (22), and the other end is hinged to the working platform (3).

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