A wind power tower drum platform device
Patent Information
- Application Number
- CN202410678961.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2044-05-29
AI Technical Summary
[0002]风电塔筒就是风力发电的塔杆,在风力发电机组中主要起支撑作用,同时吸收机组震动,高度一般在百米以上,当需要对风力发电机顶部舱室内进行维护时,需要工作人员通过塔筒内部上移到顶部舱室,而且在塔筒内部一般会设置若干层板,层板减少塔筒内共振和震动的同时,方便将部分设备安装在层板上,而且为了提高安全性,部分塔筒内层板上下位置的爬梯之间相互错位,减少坠落和坠物的风险,而为了减少工作人员升降的劳动量,塔筒内部还会额外安装电梯或升降平台,升降平台一般通过吊索驱动,直上直下,使得若干层板为了避让升降平台也会上下贯通,导致升降平台虽然方便工作人员升降,但是会使得多个层板上下贯通,降低多个层板之间的安全性
[0016]1、通过钢轨的设置,工作人员进入乘坐厢后,通过控制模块控制摇曳机,摇曳机通过钢索向上拉动乘坐厢上移,使得乘坐厢沿钢轨上移,通过钢轨的折线型设置,使得钢轨两端的竖直部相互错位,避免若干个隔断层板上的缺口槽上下贯通,提高塔筒内部的安全性,降低塔筒内高空坠物和坠落的风险,通过引导组件对钢索进行限位,使得钢索始终在两个钢轨之间穿行,从而方便带动乘坐厢沿钢轨呈折线性移动,通过连接架两个端部均设置的两个驱动轮,使得连接架沿钢轨移动,从而通过连接架在移动时使乘坐厢保持竖直状态,实现带动乘坐厢在塔筒内沿折线移动,方便工作人员在塔筒内升降移动时,提高塔筒内的安全性;
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Figure CN118419725B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wind turbine tower lifting device technology, specifically a platform device inside a wind power generation tower. Background Technology
[0002] A wind turbine tower is the support structure for wind power generation. It primarily supports the wind turbine generator set and absorbs vibrations. Its height is typically over 100 meters. When maintenance is required on the top nacelle of the wind turbine, workers must ascend through the tower's interior to reach it. The tower's interior usually contains several shelves. These shelves reduce resonance and vibration within the tower and facilitate the installation of some equipment. To improve safety, the ladders on some of the shelves are staggered to reduce the risk of falls and falling objects. To further reduce the workload for workers, elevators or lifting platforms are often installed inside the tower. These platforms are typically driven by cables and move vertically, causing some shelves to be vertically connected to avoid them. While the lifting platform facilitates worker access, it also reduces safety by connecting multiple shelves vertically. Summary of the Invention
[0003] The purpose of this invention is to provide a platform device inside a wind power tower to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution:
[0005] A platform device inside a wind turbine tower includes a tower, a jogging machine, a passenger compartment, and several partition panels. The partition panels are fixedly installed to the inner wall of the tower. A track assembly is provided on one side of each partition panel, and the track assembly includes two steel rails with a straight section in the middle. An opening and closing door is installed on the front of the passenger compartment, and a connecting frame is fixedly connected to the back of the passenger compartment. A fixed roller is fixedly connected to the middle of one side wall of the connecting frame, and connecting seats are rotatably connected to both ends of one side wall of the connecting frame. Drive wheels are rotatably connected to both ends of each connecting seat. Sliding grooves are formed on the outer side walls of both sides of the steel rails, and the drive wheels are connected to the adjacent side... The slidable connection of the slide is provided. A steel cable is wound and fixed to the output end of the traction machine. The bottom end of the steel cable is fixed to a fixed roller. A guide component is provided on the outer side of the two straight sections to guide the steel cable. Multiple fixed rods are fixed at equal intervals to the side wall of the rail near the inner wall of the tower. Multiple pedals are fixed at equal intervals between the side walls at both ends of the two rails. A bent section is provided at both ends of the rail in the straight section. A vertical section is provided at one end of the rail in the bent section. A control module is installed inside the passenger compartment. The control module is connected to the traction machine. A notch is provided on one side of the top surface of the partition plate.
[0006] Furthermore, the guiding component includes a mounting plate, which is fixedly connected to the inner wall of the tower. A guiding module one is fixedly connected to one end of one side wall of the mounting plate, and a guiding module two is fixedly connected to the other end of one side wall of the mounting plate. The guiding module one is located between the bends at one end of the two straight sections, and the guiding module two is located between the bends at the other ends of the two straight sections.
[0007] Furthermore, the guide module one includes a slide rail and a shaft two. A rail rod is slidably connected to the inner wall of the slide rail. A movable wheel is rotatably connected to one end of the rail rod. A fixed wheel is rotatably sleeved on one end of the shaft two. The other end of the shaft two is fixedly connected to one side wall of the mounting plate. The slide rail is fixedly connected to one side wall of the mounting plate. A compression spring is fixedly connected between the other end of the rail rod and the inner side wall of one end of the slide rail. The guide module one and the guide module two are centrally symmetrical.
[0008] Furthermore, a limiting rod is provided on one side of the first guide module and a limiting rod is provided on one side of the second guide module. The top end of the limiting rod and the bottom end of the limiting rod are both fixedly connected to one side wall of the mounting plate.
[0009] Furthermore, the bottom of the first limiting rod is higher than the height of the middle position of the two straight parts, and the top of the second limiting rod is lower than the height of the middle position of the two straight parts.
[0010] Furthermore, the rear of the passenger compartment is fixedly connected to both sides of the connecting frame with a stabilizing frame. The stabilizing frame is right-angled, and a roller is embedded in the outer wall of the stabilizing frame. The two stabilizing frames are arranged symmetrically around the axis of the fixed roller.
[0011] Furthermore, an arc-shaped rod is fixedly connected to the top of one side wall of the mounting plate. The top surface of the arc-shaped rod has a toothed groove. The arc-shaped rod is located above two straight sections. A shaft is rotatably sleeved on the back of the connecting frame. A gear is fixedly sleeved on one end of the shaft. The gear is used to mesh with the top surface of the arc-shaped rod. The other end of the shaft extends into the internal cavity of the passenger compartment. A handwheel is fixedly connected to the other end of the shaft.
[0012] Furthermore, a handrail is fixedly connected to one side wall of the vertical section of the rail.
[0013] Furthermore, a climbing ladder is fixedly connected to the top surface of the partition panel, and the top of the climbing ladder is fixedly connected to the adjacent handrail.
[0014] Furthermore, the projection position of the arc-shaped rod is located between the projections of the passenger compartment and the rail.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] 1. With the installation of steel rails, after the staff enters the riding car, the control module controls the traction machine. The traction machine pulls the riding car upward via steel cables, causing the riding car to move along the steel rails. The zigzag design of the steel rails ensures that the vertical parts at both ends of the rails are staggered, preventing the gaps and slots on several partition plates from running vertically through each other. This improves the safety inside the tower and reduces the risk of falling objects and falls from heights inside the tower. The guide component limits the steel cables, ensuring that the cables always pass between the two steel rails, thus facilitating the movement of the riding car along the steel rails in a zigzag pattern. Two drive wheels are installed at both ends of the connecting frame, causing the connecting frame to move along the steel rails. This keeps the riding car vertical during movement, enabling the riding car to move along a zigzag pattern inside the tower. This facilitates the lifting and lowering of staff inside the tower and improves the safety inside the tower.
[0017] 2. By setting up guide module one and guide module two, the steel cable can bend along the rail at the bends. When the passenger car moves from top to bottom, the fixed roller squeezes the moving wheel, causing the moving wheel to squeeze the spring and move away from the fixed wheel. The fixed roller passes between the fixed wheel and the moving wheel, and the steel cable wraps around the fixed wheel, causing the steel cable to bend after passing the fixed wheel. When the fixed roller passes through guide module two from top to bottom, the steel cable wraps around the fixed wheel inside guide module two, thus causing the steel cable to bend after passing guide module two. This ensures that the steel cable always travels between the two rails, facilitating the movement of the passenger car by the steel cable. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0019] Figure 2 This is a schematic diagram of the overall front view structure of this invention;
[0020] Figure 3 This is a schematic diagram of the overall rear structure of the present invention;
[0021] Figure 4 This is a schematic diagram of the passenger compartment structure in this invention;
[0022] Figure 5 This is a schematic diagram of the structure of the guide module in this invention;
[0023] Figure 6 This is a schematic diagram of the structure of limiting rod one and limiting rod two in this invention;
[0024] Figure 7 This is a schematic diagram of the rail structure in this invention.
[0025] In the diagram: 100, partition panel; 110, notch groove; 120, climbing ladder; 200, passenger compartment; 210, stabilizing frame; 220, connecting frame; 221, fixed roller; 222, connecting seat; 223, drive wheel; 230, shaft one; 231, gear; 232, handwheel; 240, control module; 300, track assembly; 310, rail; 311, chute; 312, straight section; 320, handrail. Hand Frame; 330, Pedal; 340, Fixed Rod; 400, Guide Assembly; 410, Mounting Plate; 420, Guide Module 1; 421, Axle 2; 422, Fixed Wheel; 423, Slide Rail; 424, Rail Rod; 425, Moving Wheel; 426, Compression Spring; 430, Limit Rod 1; 440, Limit Rod 2; 450, Guide Module 2; 460, Arc Rod; 500, Steel Cable; 600, Pulley. Detailed Implementation
[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0027] Please see Figures 1-7In this embodiment of the invention, a platform device inside a wind power tower includes a tower, a swaying machine 600, a passenger compartment 200, and several partition panels 100. The partition panels 100 are fixedly installed on the inner wall of the tower. A track assembly 300 is provided on one side of the partition panel 100. The track assembly 300 includes two steel rails 310, and a straight section 312 is provided in the middle of the steel rails 310. An opening and closing door is installed on the front of the passenger compartment 200. A connecting frame 220 is fixedly connected to the back of the passenger compartment 200. A fixed roller 221 is fixedly connected to the middle of one side wall of the connecting frame 220. Connecting seats 222 are rotatably connected to both ends of one side wall of the connecting frame 220. Drive wheels 223 are rotatably connected to both ends of the connecting seats 222. Sliding grooves 311 are provided on both outer side walls of the steel rails 310. Drive wheels 223 The output end of the rocking machine 600 is wound and fixed with a steel cable 500, which is slidably connected to the adjacent side chute 311. The bottom end of the steel cable 500 is fixed to the fixed roller 221. The outer side of the two straight sections 312 is provided with a guide component 400, which is used to guide the steel cable 500. The side wall of the rail 310 near the inner wall of the tower is fixed with multiple fixed rods 340 at equal intervals. Multiple pedals 330 are fixed at equal intervals between the side walls of the two ends of the two rails 310. The rail 310 is provided with a bent section at both ends of the straight section 312. The end of the rail 310 located at the bent section is provided with a vertical section. The inside of the passenger compartment 200 is equipped with a control module 240, which is connected to the rocking machine 600 by signal. A notch 110 is opened on one side of the top surface of the partition plate 100.
[0028] Specifically, the traction machine 600 is installed at the top inside the tower. After the staff enters the passenger compartment 200, they control the traction machine 600 through the control module 240. The traction machine 600 pulls the passenger compartment 200 upward via the steel cable 500, causing the passenger compartment 200 to move upward along the steel rail 310. The zigzag design of the steel rail 310 ensures that the vertical parts at both ends of the steel rail 310 are misaligned, preventing the notches and slots 110 on several partition plates 100 from being vertically connected. This improves the safety inside the tower and reduces the risk of falling objects and falls from height inside the tower. The guide component 400 guides the steel cable 500. The limit switch 00 ensures that the steel cable 500 always travels between the two steel rails 310, thus facilitating the movement of the passenger compartment 200 along the steel rails 310 in a zigzag pattern. The two drive wheels 223 at both ends of the connecting frame 220 allow the connecting frame 220 to move along the steel rails 310, thereby keeping the passenger compartment 200 in a vertical position during movement. This enables the passenger compartment 200 to move along a zigzag pattern inside the tower. Furthermore, the multiple pedals 330 allow workers to manually climb upwards via the two steel rails 310 when the passenger compartment 200 is under maintenance or malfunctioning.
[0029] Example 1
[0030] like Figures 3-6 As shown, in this embodiment, the guide assembly 400 includes a mounting plate 410, which is fixedly connected to the inner wall of the tower. A guide module 420 is fixedly connected to one end of one side wall of the mounting plate 410, and a guide module 450 is fixedly connected to the other end of one side wall of the mounting plate 410. The guide module 420 is located between the bends at one end of the two straight sections 312, and the guide module 450 is located between the bends at the other ends of the two straight sections 312. The guide module 420 includes a slide rail 423 and a shaft 450. 21. A rail rod 424 is slidably connected to the inner wall of the slide rail 423. A movable wheel 425 is rotatably connected to one end of the rail rod 424. A fixed wheel 422 is rotatably sleeved on one end of the shaft rod 421. The other end of the shaft rod 421 is fixedly connected to one side wall of the mounting plate 410. The slide rail 423 is fixedly connected to one side wall of the mounting plate 410. A compression spring 426 is fixedly connected between the other end of the rail rod 424 and the inner side wall of one end of the slide rail 423. The guide module 1 420 and the guide module 2 450 are centrally symmetrical.
[0031] In this embodiment, the setup of guide module 1 420 and guide module 2 450 facilitates the bending of the steel cable 500 along the rail 310 at the bend. When the passenger compartment 200 moves from top to bottom, the fixed roller 221 squeezes the moving wheel 425, causing the moving wheel 425 to squeeze the compression spring 426 and move away from the fixed wheel 422. The fixed roller 221 passes between the fixed wheel 422 and the moving wheel 425, and the steel cable 500 wraps around the fixed wheel 422, causing the steel cable 500 to bend after passing the position of the fixed wheel 422. After the fixed roller 221 passes through guide module 2 450 from top to bottom, the steel cable 500 wraps around the fixed wheel 422 inside guide module 2 450, thus causing the steel cable 500 to bend after passing guide module 2 450. This ensures that the steel cable 500 always travels between the two rails 310, facilitating the movement of the passenger compartment 200 by the steel cable 500.
[0032] like Figure 5 , Figure 6 As shown, in this embodiment, a limiting rod 430 is provided on one side of the guide module 420, and a limiting rod 440 is provided on one side of the guide module 450. The top end of the limiting rod 430 and the bottom end of the limiting rod 440 are both fixedly connected to one side wall of the mounting plate 410. The bottom end of the limiting rod 430 is higher than the height of the middle position of the two straight parts 312, and the top end of the limiting rod 440 is lower than the height of the middle position of the two straight parts 312.
[0033] In specific implementation, the straight section 312 on the rail 310 is arc-shaped, and the distance between each point on one side wall of the rail 310 and the inner wall of the tower is equal. Through the setting of limiting rod one 430 and limiting rod two 440, because when the steel cable 500 is taut between the fixed wheel 422 on the fixed wheel 422 and the guide module two 450, the angle deviation between the steel cable 500 and the mid-plane of the fixed wheel 422 is large, making it easy for the steel cable 500 to detach from the fixed wheel 422. The limiting rod one 430 and limiting rod two 440 further bend and limit the steel cable 500, preventing it from detaching from the fixed wheel 422. Furthermore, the positions of the limiting rod one 430 and limiting rod two 440... The fixed roller 221 is positioned at the midpoint between the two straight sections 312. When the fixed roller 221 moves downward, one end of the traction cable 500 passes below the first limiting rod 430 and above the second limiting rod 440. When the fixed roller 221 moves away from the first limiting rod 430, the portion of the cable 500 located below the first limiting rod 430 moves upward relative to the first limiting rod 430, causing the first limiting rod 430 to bend and limit the cable 500. Similarly, the second limiting rod 440 bends and limits the cable 500, thereby reducing the angle between the cable 500 and the midpoint of the fixed wheel 422 and preventing the cable 500 from detaching from the fixed wheel 422.
[0034] Example 2
[0035] Based on Embodiment 1, in order to remedy the problem in Embodiment 1 that when the passenger compartment 200 moves downward and reaches the flat section 312, the passenger compartment 200 tends to stay at the flat section 312 position after losing inertia because the flat section 312 is in a horizontal state.
[0036] like Figures 1-4 As shown, in this embodiment, the back of the passenger compartment 200 is fixedly connected to both sides of the connecting frame 220. The stabilizing frame 210 is right-angled, and a roller is embedded in the outer wall of the stabilizing frame 210. The two stabilizing frames 210 are centrally symmetrically arranged around the axis of the fixed roller 221. An arc-shaped rod 460 is fixedly connected to the top of one side wall of the mounting plate 410. The top surface of the arc-shaped rod 460 is provided with a toothed groove. The arc-shaped rod 460 is located above the two straight parts 312. A shaft 230 is rotatably sleeved on the back of the connecting frame 220. A gear 231 is fixedly sleeved on one end of the shaft 230. The gear 231 is used to mesh with the top surface of the arc-shaped rod 460. The other end of the shaft 230 extends into the internal cavity of the passenger compartment 200. A handwheel 232 is fixedly connected to the other end of the shaft 230.
[0037] In practical implementation, the stabilizer 210 ensures that as the passenger compartment 200 moves along the rail 310, the stabilizer 210 rolls against the other side wall of the rail 310 via rollers, facilitating close contact between the passenger compartment 200 and the rail 310, maintaining the passenger compartment 200's verticality, and reducing the torsional force on the drive wheel 223. When the passenger compartment 200 descends to the level section 312, the gear 231 contacts and meshes with the arc-shaped rod 460. After the passenger compartment 200 stops, the worker... The operator manually turns the handwheel 232 inside the passenger compartment 200, which drives the gear 231 to rotate. The gear 231 then moves the passenger compartment 200 to the position of the straight section 312. When the passenger compartment 200 moves to the bend of the rail 310, the passenger compartment 200 is pulled down again by gravity. When the passenger compartment 200 moves down in the vertical section of the rail 310, the height position of the passenger compartment 200 is controlled by controlling the release length of the steel cable 500 through the traction machine 600.
[0038] like Figure 1 , Figure 7 As shown, in this embodiment, a handrail 320 is fixedly connected to one side wall of the vertical part of the rail 310, and a climbing ladder 120 is fixedly connected to the top surface of the partition plate 100. The top of the climbing ladder 120 is fixedly connected to the adjacent handrail 320.
[0039] In practice, the climbing ladder 120 facilitates workers to climb onto the two steel rails 310, making manual climbing easier. The handrail 320 provides protection for the climbing workers and also facilitates the connection between the anti-disengagement hook and the handrail 320.
[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A platform device inside a wind power tower, comprising a tower, a jogging machine (600), a passenger compartment (200), and several partition panels (100), characterized in that, The partition plate (100) is fixedly installed to the inner wall of the tower. A track assembly (300) is provided on one side of the partition plate (100). The track assembly (300) includes two steel rails (310). A straight section (312) is provided in the middle of the steel rails (310). An opening and closing door is installed on the front of the passenger compartment (200). A connecting frame (220) is fixedly connected to the back of the passenger compartment (200). A fixed roller (221) is fixedly connected to the middle of one side wall of the connecting frame (220). A connecting seat (222) is rotatably connected to both ends of one side wall of the connecting frame (220). A drive wheel (223) is rotatably connected to both ends of the connecting seat (222). A sliding groove (311) is provided on both outer side walls of the steel rails (310). The drive wheel (223) is slidably connected to the sliding groove (311) on the adjacent side. A steel cable is wound and fixedly connected to the output end of the traction machine (600). (500), the bottom end of the steel cable (500) is fixedly connected to the fixed roller (221), and a guide assembly (400) is provided on the outer side of the two straight parts (312). The guide assembly (400) is used to guide the steel cable (500). The side wall of the rail (310) near the inner wall of the tower is fixedly connected to multiple fixed rods (340) at equal intervals. Multiple pedals (330) are fixedly connected at equal intervals between the side walls at both ends of the two rails (310). The rail (310) has a bent portion at both ends of the straight portion (312), and a vertical portion at one end of the bent portion. The vertical portions of the rail (310) are staggered. The passenger compartment (200) is equipped with a control module (240), which is connected to the rocking machine (600). A notch (110) is provided on one side of the top surface of the partition plate (100). The guiding assembly (400) includes a mounting plate (410) which is fixedly connected to the inner wall of the tower. A first guiding module (420) is fixedly connected to one end of one side wall of the mounting plate (410), and a second guiding module (450) is fixedly connected to the other end of one side wall of the mounting plate (410). The first guiding module (420) is located between the bends at one end of the two straight sections (312), and the second guiding module (450) is located between the bends at the other end of the two straight sections (312). The first guide module (420) includes a slide rail (423) and a second shaft (421). The inner wall of the slide rail (423) is slidably connected to a rail rod (424). One end of the rail rod (424) is rotatably connected to a moving wheel (425). One end of the second shaft (421) is rotatably sleeved with a fixed wheel (422). The other end of the second shaft (421) is fixedly connected to one side wall of the mounting plate (410). The slide rail (423) is fixedly connected to one side wall of the mounting plate (410). The other end of the rail rod (424) is fixedly connected to the inner side wall of one end of the slide rail (423) with a compression spring (426). The first guide module (420) and the second guide module (450) are centrally symmetrical. The back of the passenger compartment (200) is fixedly connected to both sides of the connecting frame (220) with a stabilizing frame (210). The stabilizing frame (210) is right-angled, and a roller is embedded in the outer wall of the stabilizing frame (210). The two stabilizing frames (210) are arranged in a centrally symmetrical manner around the axis of the fixed roller (221).
2. The platform device inside a wind power tower according to claim 1, characterized in that, One side of the guide module 1 (420) is provided with a limiting rod 1 (430), and one side of the guide module 2 (450) is provided with a limiting rod 2 (440). The top end of the limiting rod 1 (430) and the bottom end of the limiting rod 2 (440) are both fixedly connected to one side wall of the mounting plate (410).
3. The platform device inside a wind power tower according to claim 2, characterized in that, The bottom of the first limiting rod (430) is higher than the height of the middle position of the two straight parts (312), and the top of the second limiting rod (440) is lower than the height of the middle position of the two straight parts (312).
4. The platform device inside a wind power tower according to claim 2, characterized in that, An arc-shaped rod (460) is fixedly connected to the top of one side wall of the mounting plate (410). The top surface of the arc-shaped rod (460) is provided with a toothed groove. The arc-shaped rod (460) is located above two straight parts (312). A shaft (230) is rotatably sleeved on the back of the connecting frame (220). A gear (231) is fixedly sleeved on one end of the shaft (230). The gear (231) is used to mesh with the top surface of the arc-shaped rod (460). The other end of the shaft (230) extends into the internal cavity of the passenger compartment (200). A handwheel (232) is fixedly connected to the other end of the shaft (230).
5. The platform device inside a wind power tower according to claim 4, characterized in that, A handrail (320) is fixed to one side wall of the vertical part of the rail (310).
6. The platform device inside a wind power tower according to claim 5, characterized in that, A climbing ladder (120) is fixedly connected to the top surface of the partition panel (100), and the top of the climbing ladder (120) is fixedly connected to the adjacent handrail (320).
7. The platform device inside a wind power tower according to claim 4, characterized in that, The projected position of the arc-shaped rod (460) is located between the projections of the passenger compartment (200) and the rail (310).
Citation Information
Patent Citations
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