Coaxial self-resetting multi-stage lifting stand column for window cleaning machine

Abstract

The invention discloses a coaxial self-resetting multistage lifting stand column for a window cleaning machine, which comprises a stand column, an axis adjusting device, a self-resetting anti-falling device and a lifting device, the stand column comprises an inner pipe and an outer pipe, the inner pipe is positioned in the outer pipe, the lifting device is arranged at the section of the stand column and is used for controlling the lifting of the inner pipe, and the axis adjusting device is used for adjusting the axis of the self-resetting anti-falling device. The axis adjusting devices are arranged at the sections of the stand column and used for adjusting the axis of the inner pipe so that the axis of the inner pipe can be aligned with the axis of the outer pipe, and the self-resetting anti-falling device is arranged between the inner pipe and the outer pipe and used for preventing falling. The axis adjusting device is used for adjusting the position of the inner pipe, so that the axis of the inner pipe is aligned with the axis of the outer pipe, the axes of all the pipe columns of the stand column are located on the same axis, the inner pipe can stretch out and draw back smoothly, and the guidance quality of the lifting stand column is guaranteed; and the self-resetting anti-falling device is arranged to be automatically in place when the stand column is unfolded, the clamping and anti-falling effects are achieved when the lifting device fails, and the stability of the structure is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of window cleaning machine technology, and more specifically to a coaxial self-resetting multi-stage lifting column for window cleaning machines. Background Technology

[0002] With the continuous development of architectural design and construction technology, high-rise buildings have diverse shapes. To maintain the aesthetic appeal of these buildings, window cleaning machines need to be completely concealed within the structure to avoid negatively impacting the building's appearance when fully extended. Therefore, window cleaning machines are often designed with a two-stage lifting column structure, unfolding during operation and retracting when not in use. However, current window cleaning machine lifting columns have the following problems: First, most current two-stage lifting columns use a roller structure for guidance, with no adjustable gap between adjacent columns, resulting in poor guidance. Second, most current lifting columns use a manual braking pin structure, requiring manual operation to insert the pin between adjacent lifting columns after the column is raised to its position, posing a risk of working at height. The lifting column structure generally uses a hydraulic system for driving the lifting. When the hydraulic system malfunctions and cannot provide sufficient axial support force to the column, and the operator fails to operate the manual braking pin mechanism correctly or forgets to operate it, the column may fall, potentially causing injury or death. This invention provides a coaxial self-resetting multi-stage lifting column for window cleaning machines to solve the above problems. Summary of the Invention

[0003] This invention provides a coaxial self-resetting multi-stage lifting column for a window cleaning machine. The position of adjacent column tubes is adjusted by an axis adjustment device to ensure that the axes of adjacent column tubes are aligned. The self-resetting anti-fall device plays a role in preventing falls and provides anti-fall support when the support force suddenly fails, thus ensuring structural stability.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A coaxial self-resetting multi-stage lifting column for a window cleaning machine includes a column, an axis adjustment device, a self-resetting anti-fall device, and a lifting device. The column includes an inner tube and an outer tube, with the inner tube located inside the outer tube. The lifting device is located at a section of the column and is used to control the lifting and lowering of the inner tube. The axis adjustment device is located at a section of the column and is used to adjust the axis of the inner tube to align it with the axis of the outer tube. The self-resetting anti-fall device is located between the inner tube and the outer tube and is used to prevent falls. The self-resetting anti-fall device includes an anti-fall fork plate assembly and a brake shaft. The anti-fall fork plate assembly is located on the outer wall of the inner tube, and the brake shaft is located on the inner wall of the outer tube. When the column is retracted, the anti-fall fork plate assembly is in a free state, and at this time the anti-fall fork plate assembly is located below the brake shaft. When the column is fully extended, the anti-fall fork plate assembly is in an anti-fall state, the anti-fall fork plate assembly is in contact with the brake shaft, and the brake shaft is engaged in the anti-fall fork plate assembly.

[0005] Furthermore, the anti-fall fork plate assembly includes an anti-fall fork plate and a fork plate mounting shaft, wherein the anti-fall fork plate is movably mounted on the outer wall of the inner tube via the fork plate mounting shaft; The fall arresting fork plate is provided with a vertical plate, a long limb, a short limb, and a mounting hole. The vertical plate is located on the left side of the fall arresting fork plate, the long limb and the short limb are located on the right side of the fall arresting fork plate, the short limb is located above the long limb and forms a locking joint with the long limb, the mounting hole is located in the middle of the fall arresting fork plate, the fork plate mounting shaft is located in the mounting hole, and the center of gravity of the fall arresting fork plate is located to the lower left of the mounting hole. In the free state, the anti-fall fork plate is tilted downwards, the vertical plate is located at the lower left, and the bayonet is located at the upper right; In the fall-prevention state, the brake shaft is located in the bayonet, the fall-prevention fork plate is tilted upwards, the vertical plate is located at the upper left, and the bayonet is located at the lower right.

[0006] Furthermore, in the fall-proof state, the distance between the axis of the brake shaft and the axis of the mounting hole is L1, and the horizontal distance between the axis of the brake shaft and the axis of the mounting hole is L2. At this time, L1 > L2.

[0007] Furthermore, the axis adjustment device includes an outer frame, an axis adjustment mechanism, and a pulley mechanism. The outer frame is located on the top of the outer tube. The axis adjustment mechanism and the pulley mechanism are alternately arranged on the outer frame. The axis adjustment mechanisms are arranged in pairs, and the pairs of axis adjustment mechanisms are symmetrically arranged on one set of opposite surfaces of the outer tube. The pulley mechanisms are arranged in pairs, and the pairs of pulley mechanisms are symmetrically arranged on another set of opposite surfaces of the outer tube.

[0008] Furthermore, the shaft adjusting mechanism includes a guide frame, an adjusting frame, an adjusting rod, and an adjusting plate. The guide frame is fixedly mounted on the outer frame, the adjusting plate is located in the guide frame and on the inner side of the guide frame, the adjusting frame is fixedly mounted on the guide frame, and the adjusting rod is mounted on the adjusting frame. The inner end of the adjusting rod contacts the adjusting plate and is used to drive the adjusting plate to move in and out.

[0009] Furthermore, the adjusting plate includes a push plate and a fitting plate. The push plate is connected to the adjusting rod, and the fitting plate is located inside the push plate and fits against the outer wall of the inner tube.

[0010] Furthermore, the adjusting frame is provided with an adjusting sleeve, and the adjusting rod is located in the adjusting sleeve and threadedly connected to the adjusting sleeve.

[0011] Furthermore, the guide frame is provided with a guide cavity, and the adjusting plate is located in the guide cavity and fits against the outer wall of the inner tube.

[0012] Furthermore, the pulley mechanism includes a pulley block, which is vertically arranged in the outer frame, and the inner side of the pulley block is in contact with the outer wall of the inner tube.

[0013] Furthermore, the lifting device is installed on the outer wall of the outer tube, and the output end of the lifting device is movably connected to the outer wall of the inner tube.

[0014] The beneficial effects of this invention are as follows: An axis adjustment device is installed to adjust the position of the inner tube so that its axis is aligned with the axis of the outer tube, so that the axes of all the tubes of the column are on the same axis, thereby achieving smooth extension and retraction of the inner tube and ensuring the guiding of the lifting column. The self-resetting anti-fall device automatically positions itself when the column is deployed, and acts as a locking mechanism to prevent falls when the lifting device fails, ensuring the stability of the structure. This not only avoids the safety hazards of high-altitude operations where operators manually install the braking device, but also avoids the safety hazards inherent in the equipment itself when the braking device is not installed due to error. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the configuration of the axis adjustment device of the present invention; Figure 3 This is a schematic diagram showing the setting state of the shaft adjusting mechanism of the present invention; Figure 4 This is a schematic diagram of the inner structure of the shaft adjusting mechanism of the present invention; Figure 5 This is a cross-sectional schematic diagram of the shaft adjusting mechanism of the present invention; Figure 6 This is a schematic diagram showing the guide frame configuration of the present invention; Figure 7 This is a schematic diagram showing the adjustment frame of the present invention in various configurations. Figure 8 This is a schematic diagram showing the configuration of the self-resetting fall arrestor of the present invention. Figure 9 This is a schematic diagram of the self-resetting fall arrest device of the present invention in a stuck fall arrest state; Figure 10 This is a cross-sectional schematic diagram of the self-resetting fall arrestor of the present invention; Figure 11 This is a schematic diagram of the fall prevention process of the self-resetting fall prevention device of the present invention; Figure 12 This is a schematic diagram of the anti-fall fork plate assembly structure of the present invention; Figure 13 This is a schematic diagram of the anti-fall fork plate of the present invention.

[0016] Reference numerals: 1. Column; 11. Inner tube; 12. Outer tube; 2. Axis adjustment device; 21. Outer frame; 22. Axis adjustment mechanism; 221. Guide frame; 222. Adjusting frame; 223. Adjusting rod; 224. Adjusting plate; 225. Adjusting sleeve; 23. Pulley mechanism; 3. Self-resetting anti-fall device; 31. Anti-fall fork plate assembly; 311. Anti-fall fork plate; 3111. Vertical plate; 3112. Long limb; 3113. Short limb; 3114. Mounting hole; 3115. Bayonet; 312. Fork plate mounting shaft; 32. Brake shaft; 4. Lifting device. Detailed Implementation

[0017] The technical solutions in 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] like Figure 1 , 2 As shown in Figure 8, a coaxial self-resetting multi-stage lifting column for a window cleaning machine includes a column 1, an axis adjustment device 2, a self-resetting anti-fall device 3, and a lifting device 4. The column 1 includes an inner tube 11 and an outer tube 12. The column 1 is configured with two stages and three sections. The two adjacent sections of each stage are the inner tube 11 located inside and the outer tube 12 located outside. The inner tube 11 is located inside the outer tube 12. The lifting device 4 is located at the section of the column 1 and is used to control the lifting and lowering of the inner tube 11 in the outer tube 12. The axis adjustment device 2 is located at the section of the column 1 and is used to adjust the axis of the inner tube 11 to align it with the axis of the outer tube 12. The self-resetting anti-fall device 3 is located between the inner tube 11 and the outer tube 12 and is used to prevent falls. The axis adjustment device 2, the self-resetting anti-fall device 3, and the lifting device 4 are all configured in two sets, and one set is provided at each section of the column 1.

[0020] When column 1 is raised or lowered, the output end of the lifting device 4 extends upward, extending the inner tube 11 upward from the outer tube 12. When retraction is required, the output end of the lifting device 4 first releases the fall prevention by moving upward, and then retracts downward to retract the inner tube 11 back into the outer tube 12. Before column 1 is raised or lowered, the position of the inner tube 11 is adjusted by the axis adjustment device 2. Each set of axis adjustment devices 2 includes two axis adjustment mechanisms 22 and two pulley mechanisms 23. The two axis adjustment mechanisms 22 are arranged in pairs, and the two pairs of axis adjustment mechanisms 22 are symmetrically arranged on one set of opposite faces of the outer tube 12. The two pulley mechanisms 23 are symmetrically arranged on the other set of opposite faces of the outer tube 12. During adjustment, the axis of the inner tube 11 is aligned with the axis of the outer tube 12 by adjusting the axis adjustment mechanism 22. By adjusting one by one, the tubes of the multi-stage column 1 are aligned. The axes are located on the same axis, ensuring the guidance of column 1. Before column 1 is raised or lowered, anti-fall fork plate assembly 31 is in a free state and located below brake shaft 32. As column 1 is gradually unfolded, anti-fall fork plate assembly 31 also begins to contact brake shaft 32. During the contact with brake shaft 32, anti-fall fork plate assembly 31 is rotated by brake shaft 32. After column 1 is unfolded into place, anti-fall fork plate assembly 31 and brake shaft 32 are engaged and locked. When lifting device 4 suddenly fails, the locked anti-fall fork plate assembly 31 and brake shaft 32 prevent inner tube 11 from falling to achieve the purpose of anti-fall. After lifting device 4 restores its support effect, when it is reset upward, anti-fall fork plate assembly 31 will disengage from the locked brake shaft 32, achieving disengagement and reset to a free state.

[0021] like Figure 8 , 9 As shown in Figure 10, the self-resetting anti-fall device 3 includes an anti-fall fork plate assembly 31 and a brake shaft 32. The anti-fall fork plate assembly 31 is disposed on the outer wall of the inner tube 11. The anti-fall fork plate assembly 31 includes an anti-fall fork plate 311 and a fork plate mounting shaft 312. The anti-fall fork plate 311 is movably disposed on the outer wall of the inner tube 11 through the fork plate mounting shaft 312. The fork plate mounting shaft 312 is fixedly disposed on the outer wall of the inner tube 11. The anti-fall fork plate 311 is movably disposed on the fork plate mounting shaft 312 and can rotate about the fork plate mounting shaft 312. The brake shaft 32 is fixedly disposed on the inner wall of the outer tube 12 and is arranged vertically corresponding to the anti-fall fork plate assembly 31.

[0022] like Figure 8 , 11As shown in Figure 12, in the retracted state of the column, the anti-fall fork plate assembly 31 is in a free state. At this time, the anti-fall fork plate assembly 31 retracts into the outer tube 12 along with the inner tube 11 and is located below the brake shaft 32. During the column unfolding process, the anti-fall fork plate assembly 31 gradually rises with the inner tube 11. After contacting the brake shaft 32, it is turned by the brake shaft 32 until the inner tube 11 rises to the highest point and the column is in a fully unfolded state. At this time, the anti-fall fork plate assembly 31 is in an anti-fall state. The anti-fall fork plate assembly 31 contacts the brake shaft 32, and the brake shaft 32 is engaged in the anti-fall fork plate assembly 31 and locks into the anti-fall fork plate assembly 31 to prevent falling.

[0023] like Figure 12 , 13 As shown, the fall arrestor fork plate 311 is further provided with a vertical plate 3111, a long limb 3112, a short limb 3113, and a mounting hole 3114. The vertical plate 3111 is located on the left side of the fall arrestor fork plate 311, the long limb 3112 and the short limb 3113 are located on the right side of the fall arrestor fork plate 311, the short limb 3113 is located above the long limb 3112 and forms a bayonet 3115 with the long limb 3112, the mounting hole 3114 is located in the middle of the fall arrestor fork plate 311, and the fork plate mounting shaft 312 is located in the mounting hole 3114. When the fall arrestor fork plate 311 is in a horizontal state, the center of gravity of the fall arrestor fork plate 311 is located to the lower left of the mounting hole 3114.

[0024] like Figure 12 , 13 As shown, in the free state, the anti-fall fork plate 311 is tilted downwards, the vertical plate 3111 is located at the lower left, and the bayonet 3115 is located at the upper right.

[0025] In the fall-prevention state, the brake shaft 32 is located in the bayonet 3115, the fall-prevention fork 311 is tilted upwards, the vertical plate 3111 is located in the upper left, and the bayonet 3115 is located in the lower right.

[0026] like Figure 9 As shown, in the fall-prevention state, the distance between the axis of the brake shaft 32 and the axis of the mounting hole 3114 is L1, and the horizontal distance between the axis of the brake shaft 32 and the axis of the mounting hole 3114 is L2. At this time, L1 > L2.

[0027] The fall protection process of the self-resetting fall protection device 3 includes the operating principle, the fall protection principle and the self-resetting principle; During the ascent, as the anti-fall fork plate 311 comes into contact with the brake shaft 32, the anti-fall fork plate 311 is propelled by the brake shaft 32 and rotates clockwise until the brake shaft 32 is engaged in the latch 3115. When the inner tube 11 rises to the fully extended point, the brake shaft 32 is fully engaged in the latch 3115. At this time, the anti-fall fork plate 311 is locked and can no longer rotate counterclockwise, but can only rotate clockwise. The self-resetting anti-fall device 3 locks in, thus achieving the anti-fall effect. When the inner tube 11 needs to retract, the inner tube 11 is first raised further upward, so that the anti-fall fork plate 311 continues to rotate clockwise and disengages from the brake shaft 32. Then the inner tube 11 is retracted downward, thus achieving the smooth retraction of the inner tube 11.

[0028] like Figure 11 As shown, the operating principle is as follows: After the anti-fall fork plate 311 is installed on the fork plate mounting shaft 312 through the mounting hole 3114, it can rotate freely around the fork plate mounting shaft 312. Due to the presence of the vertical plate 3111, the anti-fall fork plate 311 becomes an eccentric structure, and its center of gravity is biased towards one side of the vertical plate 3111. Therefore, in the free state, under the action of gravity, the anti-fall fork plate 311 is in a downward tilted state, with the long limb 3112 and the short limb 3113 forming a bayonet 3115 located at the upper right. When the anti-fall fork plate assembly 31 rises with the inner tube 11, the anti-fall fork plate 311 will contact the brake shaft 32. Upon contact, the brake shaft 32 will contact the upper surface of the long limb 3112. After contact, since the brake shaft 32, which is located on the outer tube 12, remains stationary, the brake shaft 32 will press the long limb 3112, thereby causing the anti-fall fork plate 311 to rotate clockwise until the inner tube 11 rises to its highest point. When the inner tube 11 is raised to the highest point, the anti-fall fork plate 311 is in an upward tilted state, that is, the vertical plate 3111 is located in the upper left and the latch 3115 is located in the lower right. At this time, the brake shaft 32 is inserted into the latch 3115 and the short limb 3113 is located above the brake shaft 32. At this time, it is in an anti-fall state and plays the role of anti-fall.

[0029] like Figure 9As shown, the anti-fall principle is as follows: When the lifting device 4 suddenly fails during anti-fall operation, the inner tube 11 suddenly loses support, and the inner tube 11 and its anti-fall fork plate assembly 31 will tend to fall downwards. However, since the brake shaft 32 is already engaged in the latch 3115, and since L1 > L2, the torque between the brake shaft 32 and the short limb 3113 will interfere. Under the action of the frictional force of the torque, the anti-fall fork plate 311 and the brake shaft 32 will engage and self-limit and lock. At this time, the anti-fall fork plate Because the self-limiting plate 311 is locked and will not rotate counterclockwise, the brake shaft 32 cannot be disengaged from the latch 3115 upwards. Due to gravity, the inner tube 11 only has a downward tendency to move. Therefore, the anti-fall fork plate 311 cannot rotate clockwise, and thus the brake shaft 32 cannot move downwards from the latch 3115 to disengage. This results in the inner tube 11 being secured to the brake shaft 32 by the anti-fall fork plate 311, keeping the inner tube 11 secure and preventing it from falling downwards, thus achieving the purpose of preventing a fall.

[0030] like Figure 11 As shown, the self-resetting principle is as follows: When the lifting device 4 returns to normal or when the inner tube 11 needs to be lowered, the lifting device 4 is first raised, and the inner tube 11 and its anti-fall fork plate 311 move upward together. The brake shaft 32 continues to move the long limb 3112, causing the anti-fall fork plate 311 to continue rotating clockwise. At this time, the anti-fall fork plate 311 will no longer be stuck with the brake shaft 32. It continues to rise until the anti-fall fork plate 311 disengages from the brake shaft 32. At this time, the anti-fall is released, and then the lifting device 4 is controlled to descend downwards. The moving inner tube 11 and its upper anti-fall fork plate 311 move downward together. When the anti-fall fork plate 311 moves downward, it will contact the brake shaft 32 again. At this time, after the lower surface of the long limb 3112 contacts the brake shaft 32, the anti-fall fork plate 311 will be moved by the brake shaft 32 to rotate counterclockwise until the long limb 3112 disengages from the brake shaft 32. At this time, the anti-fall fork plate 311 disengages from the brake shaft 32 and returns to a free state after swinging, continuing to lower the inner tube 11 until it is fully retracted, realizing the entire process of self-resetting.

[0031] like Figure 2 , 3 As shown in Figure 4, the axis adjustment device 2 further includes an outer frame 21, an axis adjustment mechanism 22, and a pulley mechanism 23. The outer frame 21 is located at the top of the outer tube 12 and at the section of the column 1. The axis adjustment mechanism 22 and the pulley mechanism 23 are alternately arranged on the outer frame 21. The axis adjustment mechanisms 22 are arranged in pairs, and the pairs of axis adjustment mechanisms 22 are symmetrically arranged on one set of opposite surfaces of the outer tube 12. The pulley mechanisms 23 are arranged in pairs, and the pairs of pulley mechanisms 23 are symmetrically arranged on another set of opposite surfaces of the outer tube 12.

[0032] like Figure 4 , 5As shown in Figures 6 and 7, the adjusting mechanism 22 further includes a guide frame 221, an adjusting frame 222, an adjusting rod 223, and an adjusting plate 224. The guide frame 221 is fixedly mounted on the outer frame 21 and has a guide cavity. The adjusting plate 224 is located in the guide cavity of the guide frame 221 and is located inside the guide frame 221, fitting against the outer wall of the inner tube 11. The adjusting frame 222 is fixedly mounted on the guide frame 221 and is located outside the guide frame 221. The adjusting frame 222 is provided with an adjusting sleeve 225. The adjusting rod 223 is disposed in the adjusting sleeve 225 on the adjusting frame 222. The adjusting rod 223 and the adjusting sleeve 225 are connected by a thread. The inner end of the adjusting rod 223 passes through the guide frame 221 and the adjusting frame 222 and then contacts the adjusting plate 224 to drive the adjusting plate 224 to move inward and outward. The outer end of the adjusting rod 223 is located outside the outer tube 12.

[0033] The adjusting principle of the adjusting mechanism 22 is as follows: When the adjusting rod 223 is turned, it moves inward or outward. When the adjusting rod 223 moves inward, it pushes the adjusting plate 224 inward as well. The adjusting plate 224 then pushes the inner tube 11 to the other side, thereby adjusting the axis of the inner tube 11. The axis of the inner tube 11 is adjusted by the actions of the adjusting mechanisms 22 on both sides. During adjustment, the direction and degree of the inner tube 11's offset are first measured, then the required pushing distance is calculated. The adjusting rod 223 is then adjusted, alternating between both sides, until the axis of the inner tube 11 meets the requirements. Adjustment is performed from bottom to top.

[0034] like Figure 5 As shown, the adjusting plate 224 further includes a push plate and a fitting plate. The push plate is connected to the adjusting rod 223, and the fitting plate is located inside the push plate and fits against the outer wall of the inner tube 11.

[0035] Preferably, the push plate is a steel plate and the bonding plate is a nylon plate, which has compressibility and shock absorption effects.

[0036] Furthermore, the bonding plate is provided with a lubricating oil channel for adding lubricating oil to improve the stability of the column 1 lifting and lowering; the lubricating oil channel is set perpendicular to the bonding plate, the outlet is located on the bonding surface between the bonding plate and the inner tube 11, and the inlet is located between the bonding plate and the push plate.

[0037] Furthermore, the guide frame 221 includes a fixed plate and a guide cavity. The guide cavity is arranged perpendicular to the fixed plate and is a square tube. The push plate is located in the guide cavity, and the adjustment frame 222 is fixed to the fixed plate by bolts.

[0038] Furthermore, the adjusting rod 223 is a screw rod, and the adjusting sleeve 225 is a screw sleeve.

[0039] Furthermore, the pulley mechanism 23 includes a pulley block, which is vertically arranged in the outer frame 21. The inner side of the pulley block is in contact with the outer wall of the inner tube 11. The pulley mechanism 23 serves to support and limit movement.

[0040] Furthermore, the lifting device 4 is installed on the outer wall of the outer tube 12, and the output end of the lifting device 4 is movably connected to the outer wall of the inner tube 11. Two adjacent sets of lifting devices 4 are staggered on the outer wall of the column 1 to allow space between them.

[0041] 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 illustrative and non-limiting in all respects, 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, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A coaxial self-resetting multi-stage lifting column for a window cleaning machine, characterized in that, The device includes a column (1), an axis adjustment device (2), a self-resetting anti-fall device (3), and a lifting device (4). The column (1) includes an inner tube (11) and an outer tube (12). The inner tube (11) is located in the outer tube (12). The lifting device (4) is located at the section of the column (1) and is used to control the lifting of the inner tube (11). The axis adjustment device (2) is located at the section of the column (1) and is used to adjust the axis of the inner tube (11) to align it with the axis of the outer tube (12). The self-resetting anti-fall device (3) is located between the inner tube (11) and the outer tube (12) and is used to prevent falls. The self-resetting anti-fall device (3) includes an anti-fall fork plate assembly (31) and a brake shaft (32). The anti-fall fork plate assembly (31) is located on the outer wall of the inner tube (11), and the brake shaft (32) is located on the inner wall of the outer tube (12). When the column is retracted, the anti-fall fork plate assembly (31) is in a free state. At this time, the anti-fall fork plate assembly (31) is located below the brake shaft (32). When the column is fully extended, the anti-fall fork plate assembly (31) is in an anti-fall state. The anti-fall fork plate assembly (31) is in contact with the brake shaft (32), and the brake shaft (32) is engaged in the anti-fall fork plate assembly (31).

2. The coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 1, characterized in that, The anti-fall fork plate assembly (31) includes an anti-fall fork plate (311) and a fork plate mounting shaft (312). The anti-fall fork plate (311) is movably mounted on the outer wall of the inner tube (11) via the fork plate mounting shaft (312). The fall arresting fork plate (311) is provided with a vertical plate (3111), a long limb (3112), a short limb (3113) and a mounting hole (3114). The vertical plate (3111) is located on the left side of the fall arresting fork plate (311), the long limb (3112) and the short limb (3113) are located on the right side of the fall arresting fork plate (311), the short limb (3113) is located above the long limb (3112) and forms a bayonet (3115) with the long limb (3112), the mounting hole (3114) is located in the middle of the fall arresting fork plate (311), the fork plate mounting shaft (312) is located in the mounting hole (3114), and the center of gravity of the fall arresting fork plate (311) is located to the lower left of the mounting hole (3114). In the free state, the anti-fall fork plate (311) is tilted downwards, the vertical plate (3111) is located at the lower left, and the bayonet (3115) is located at the upper right; In the fall-prevention state, the brake shaft (32) is located in the bayonet (3115), the fall-prevention fork plate (311) is tilted upward, the vertical plate (3111) is located in the upper left, and the bayonet (3115) is located in the lower right.

3. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 2, characterized in that, In the fall-proof state, the distance between the axis of the brake shaft (32) and the axis of the mounting hole (3114) is L1, and the horizontal distance between the axis of the brake shaft (32) and the axis of the mounting hole (3114) is L2. At this time, L1 > L2.

4. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 1, characterized in that, The axis adjustment device (2) includes an outer frame (21), an axis adjustment mechanism (22), and a pulley mechanism (23). The outer frame (21) is located on the top of the outer tube (12). The axis adjustment mechanism (22) and the pulley mechanism (23) are alternately arranged on the outer frame (21). The axis adjustment mechanisms (22) are arranged in pairs, and the pairs of axis adjustment mechanisms (22) are symmetrically arranged on one set of opposite surfaces of the outer tube (12). The pulley mechanisms (23) are arranged in pairs, and the pairs of pulley mechanisms (23) are symmetrically arranged on another set of opposite surfaces of the outer tube (12).

5. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 4, characterized in that, The shaft adjustment mechanism (22) includes a guide frame (221), an adjustment frame (222), an adjustment rod (223), and an adjustment plate (224). The guide frame (221) is fixedly mounted on the outer frame (21). The adjustment plate (224) is located in the guide frame (221) and on the inner side of the guide frame (221). The adjustment frame (222) is fixedly mounted on the guide frame (221). The adjustment rod (223) is mounted on the adjustment frame (222). The inner end of the adjustment rod (223) contacts the adjustment plate (224) and is used to drive the adjustment plate (224) to move inward and outward.

6. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 5, characterized in that, The adjusting plate (224) includes a push plate and a fitting plate. The push plate is connected to the adjusting rod (223). The fitting plate is located inside the push plate and fits against the outer wall of the inner tube (11).

7. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 5, characterized in that, The adjusting frame (222) is provided with an adjusting sleeve (225), and the adjusting rod (223) is located in the adjusting sleeve (225) and is threadedly connected to the adjusting sleeve (225).

8. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 5, characterized in that, The guide frame (221) is provided with a guide cavity, and the adjusting plate (224) is located in the guide cavity and is in contact with the outer wall of the inner tube (11).

9. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 4, characterized in that, The pulley mechanism (23) includes a pulley block, which is vertically arranged in the outer frame (21), and the inner side of the pulley block is in contact with the outer wall of the inner tube (11).

10. A coaxial self-resetting multi-stage lifting column for a window cleaning machine according to claim 1, characterized in that, The lifting device (4) is installed on the outer wall of the outer tube (12), and the output end of the lifting device (4) is movably connected to the outer wall of the inner tube (11).

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