A stable lifting multi-stage safety door structure

Abstract

This utility model provides a stable, multi-stage safety door structure, relating to the field of platform screen door technology. It includes a fixed column, a lifting column, and a rope frame. The rope frame includes a first frame plate fixedly mounted on the top of the lifting column and a second frame plate for sliding up and down along the lifting column. Both the first and second frame plates are connected to pull ropes. This utility model uses multiple plates connected by pull ropes to form a safety door. When the safety door is lowered, it has sufficient protective height, and the height of the fixed column is the same as the sum of the lengths of the multiple plates, minimizing the height of the fixed column and ensuring the safety door structure's safety. When the safety door is raised, it occupies little space, yet its height is still sufficient for passengers to pass through. The entire structure is simple and highly safe.

Description

Technical Field

[0001] This utility model relates to the field of platform safety door technology, and in particular, it relates to a multi-stage safety door structure with stable lifting and lowering. Background Technology

[0002] With urban development, the demand for rail vehicles to serve transportation functions between urban areas and suburbs is increasing. As different regions develop in diverse ways, the actual needs for rail vehicles vary greatly, including urban subways (including underground railways and surface light rail), and trains between cities (including bullet trains, high-speed trains, and regular trains), etc., all of which are collectively referred to as rail transit vehicles.

[0003] These rail transit platforms experience high passenger flow and high-speed rail operations, especially high-speed rail platforms, which are often very spacious and densely populated. Therefore, platform screen doors are necessary to separate platform personnel from high-speed trains and prevent accidental falls. For example, Chinese utility model patent CN1517427A provides an intelligent platform screen door structure for rail transit platforms, relating to the field of rail transit technology. It includes fixed columns and movable columns. The fixed columns have telescopic grooves with limit sliding columns inside. The movable columns include a main plate, a lead screw, and a slider. The upper part of the main plate has a rotating roller and a conveyor belt. The lead screw has a first connector and a second connector. The end of the conveyor belt away from the first connector is connected to the slider, which has a hook. There are at least two fixed columns and movable columns, with a pull rope connecting the movable columns on the two fixed columns to the hook at one end. The above-mentioned utility model is simple to set up. It uses a pull-rope type platform screen door to extend the distance between the platform screen door columns. One platform screen door area corresponds to the doors of multiple types of trains, which is suitable for the different requirements of different train door opening positions, making it convenient for passengers to get on and off. Moreover, the two-stage lifting structure of the pull rope is stable, and when the pull rope is lowered, it can effectively prevent people from falling onto the platform, thus ensuring high safety.

[0004] Because the safety screen door has many pull ropes, typically eight horizontal ropes, if the distance between two adjacent (horizontal) pull ropes remains constant (20cm) during the entire raising and lowering process, the safety door can form a safety protection height of at least 1.6 meters when lowered. This would mean that the safety door would also occupy 1.6 meters of height when raised, resulting in the top pull rope being 3.6 meters above the ground (the bottom pull rope needs to be 2 meters above the ground for passenger passage). Furthermore, there are high-voltage power lines above the high-speed rail platform, posing a significant safety hazard. Therefore, it is best to design the distance between adjacent pull ropes to vary. When the safety door is lowered, the distance between adjacent pull ropes is larger (20cm), providing sufficient safety protection height. When the safety door is raised, the distance between adjacent pull ropes becomes smaller, allowing passengers to pass underneath the pull ropes and reducing the height of the raised door.

[0005] Therefore, multiple pull-rope door structures have been designed. For example, Chinese invention patent CN120270275A provides a stable lifting multi-stage safety door structure, relating to the field of platform safety door technology. It includes a fixed column and a lifting unit, the lifting unit comprising a main frame and a mounting frame; a first roller and a second roller are mounted on the main frame; the first roller is connected to a first belt, and the second roller is connected to a second belt, with a sliding block mounted on the first belt; a drive unit, a first slide rail, and a second slide rail are mounted on the fixed column; a limit block is mounted on the second slide rail; a first plate and a second plate are mounted on the mounting frame; and safety door pull ropes are connected to both the first and second plates. This invention uses multiple plates connected by pull ropes to form a safety door. The multiple plates rise synchronously in the initial stage of the safety door's ascent. After the sliding block rises to a predetermined height, the second plate located below accelerates its ascent, ensuring sufficient protective height when the safety door is lowered, minimizing its height occupation during ascent, and preventing accidental trapping of objects that could cause hazards. The entire structure is simple, not easily damaged, and highly safe.

[0006] However, the above-mentioned pull-rope safety gate structure also has the following defects: the main frame is too high, requiring at least 2.5 meters in height. The high wind pressure of the high-speed train entering the station will cause a great suction force on the main frame. At best, the main frame will sway significantly; at worst, the main frame will be easily damaged and injure pedestrians. Moreover, the stability of the pull-rope gate is also poor after it is raised, resulting in poor safety.

[0007] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient multi-rope safety gate structure. Utility Model Content

[0008] The purpose of this utility model is to provide a stable, multi-stage safety door structure that uses multiple plates connected by ropes to form a safety door. When the safety door is lowered, it has sufficient protective height, and the height of the fixing column is the same as the sum of the lengths of the multiple plates, which minimizes the height of the fixing column and ensures the safety of the safety door structure. When the safety door is raised, it occupies little space, and the height is still sufficient for passengers to pass through. The entire structure is simple and highly safe.

[0009] To achieve the above objectives, this utility model employs the following technical solution: A stable, multi-stage safety door structure includes a fixed column, a lifting column, and a rope frame. The rope frame includes a first frame plate fixedly mounted on the top of the lifting column and a second frame plate for sliding up and down along the lifting column. Both the first and second frame plates are connected to pull ropes. The first and second frame plates are of the same length, and the sum of their lengths is equal to the length of the fixed column. A limit sensor is installed on the fixed column, and an upper limit plate and a lower limit plate are installed on the lifting column for contacting the limit sensor. When the upper height of the lifting column is equal to the upper height of the fixed column, the height of the second frame plate is lower than the height of the first frame plate, and the sum of the lengths of the first frame plate and the second frame plate is equal to the length of the fixed column; When the lifting column rises along the fixed column, the second frame plate rises along the lifting column; When the lifting column rises to its highest point, the height of the second support plate is approximately equal to the height of the first support plate.

[0010] As a preferred embodiment of the present invention, the lifting column includes a hollow frame and a side plate disposed on the side of the hollow frame; the first frame plate is disposed inside the hollow frame, and the second frame plate is disposed on the side of the hollow frame away from the fixed column.

[0011] As a preferred embodiment of this utility model, a first slider is provided on the side of the hollow frame near the fixed column; a first slide rail is provided on the fixed column to facilitate the sliding of the first slider; a second slider is provided on the side of the second frame near the hollow frame, and a second slide rail is provided on the side of the lifting column away from the fixed column to facilitate the sliding of the second slider.

[0012] As a preferred embodiment of this invention, both the upper limit plate and the lower limit plate are disposed on the side plate; the limit sensor is located between the upper limit plate and the lower limit plate.

[0013] As a preferred embodiment of this invention, a motor is provided on the fixed column, and a traction belt for connecting to the lifting column is provided on the motor.

[0014] As a preferred embodiment of this invention, a counterweight is provided at the end of the traction belt away from the lifting column.

[0015] As a preferred embodiment of this utility model, the lifting column is provided with a fixed pulley, and the fixed pulley is provided with a transmission belt for connecting with the second frame plate, and the end of the transmission belt away from the second frame plate is connected to the fixed column.

[0016] As a preferred embodiment of this utility model, the fixed pulley includes a first fixed pulley and a second fixed pulley coaxially arranged with the first fixed pulley, the transmission belt includes a first transmission belt connected to the first fixed pulley and a second transmission belt connected to the second fixed pulley, the first transmission belt is connected to the second frame plate, and the end of the second transmission belt away from the second frame plate is connected to the fixed column.

[0017] As a preferred embodiment of this utility model, the first and second frame plates are provided with a rope fixing block for connecting to the rope.

[0018] As a preferred embodiment of this utility model, the fixed column, the lifting column, the first frame plate, and the second frame plate are all integrally formed parts.

[0019] The beneficial effects of this utility model of a stable lifting multi-stage safety door structure are as follows: multiple plates are connected by ropes to form a safety door. When the safety door is lowered, it has sufficient protective height, and the height of the fixing column is the same as the sum of the lengths of the multiple plates, which can minimize the height of the fixing column and ensure the safety of the safety door structure. When the safety door is raised, it occupies little space, and the height is still sufficient for passengers to pass through. The whole structure is simple and highly safe. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a multi-stage safety door structure with stable lifting and lowering as described in this utility model when the safety door is closed; Figure 2 This is a three-dimensional structural diagram of the stable lifting multi-stage safety door structure of this utility model from another angle when the safety door is closed. Figure 3 This is a schematic diagram of the overall three-dimensional structure of a stable lifting multi-stage safety door structure of the present invention when the safety door is opened; Figure 4 This is a schematic diagram of the fixed column in one embodiment of a stable lifting multi-stage safety door structure according to the present invention. Figure 5 This is a schematic diagram of the lifting column (including the rope frame) in one embodiment of a multi-stage safety door structure for stable lifting according to the present invention; Figure 6 This is a schematic diagram of the lifting column (including the rope frame part) from another angle in one embodiment of a multi-stage safety door structure for stable lifting according to the present invention; In the diagram: 1. Fixed column, 11. Motor, 12. Traction belt, 13. Counterweight, 14. First slide rail, 15. Limit sensor, 16. Base, 2. Lifting column, 201. Hollow frame, 202. Side plate, 203. First slider, 204. Second slider, 205. Upper limit plate, 206. Lower limit plate, 21. Fixed pulley, 211. First fixed pulley, 212. Second fixed pulley, 22. Transmission belt, 221. First transmission belt, 222. Second transmission belt, 23. Second slide rail, 3. Rope frame, 31. First frame plate, 32. Second frame plate, 33. Pull rope fixing block. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement and steps of the modules and steps set forth in these embodiments do not limit the scope of the present invention.

[0023] At the same time, it should be understood that, for ease of description, the process shown in the attached diagram is not performed in isolation, but rather involves multiple steps that overlap.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0026] Techniques, methods, and systems known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and systems should be considered part of this application specification.

[0027] Example 1: As Figures 1 to 6 The illustration shown is merely one embodiment of this utility model. A multi-stage safety door structure with stable lifting and lowering includes a fixed column 1, a lifting column 2, and a rope frame 3. The rope frame 3 includes a first frame plate 31 fixedly disposed on the top of the lifting column 2 and a second frame plate 32 for sliding up and down along the lifting column 2. Pull ropes are connected to both the first frame plate 31 and the second frame plate 32. The first frame plate 31 and the second frame plate 32 have the same length, and the sum of the lengths of the first frame plate 31 and the second frame plate 32 is equal to the length of the fixed column 1. A limit sensor 15 is provided on the fixed column 1, and an upper limit plate 205 and a lower limit plate 206 are provided on the lifting column 2 for contacting the limit sensor 15. In this utility model, the fixed column 1 is the gatepost of the platform screen door. The lifting column 2 installed on the fixed column 1 is connected to the safety door pull rope. The two ends of the safety door pull rope are respectively connected to the lifting columns 2 on the two fixed columns 1, forming a pull rope safety door structure. When the lifting column 2 is raised on the fixed column 1, the safety door is raised, which makes it convenient for passengers to pass under the safety door pull rope and is used for getting on and off the train when it stops. Conversely, when the lifting column 2 is lowered on the fixed column 1, the safety door is closed, which blocks passengers from passing through and is used for safety protection when the train is running.

[0028] The lifting column 2 is provided with a rope frame 3, which specifically includes a first frame plate 31 fixed to the top of the lifting column 2 and a second frame plate 32 for sliding up and down on the lifting column 2. The safety door pull rope is actually connected to the first frame plate 31 and the second frame plate 32. The first frame plate 31 and the second frame plate 32 are provided with pull rope fixing blocks 33 for connecting with the pull rope.

[0029] That is, the upper height of the first support plate 31 is the same as the upper height of the lifting column 2, and the upper height of the second support plate 32 is not higher than the upper height of the lifting column 2, that is, the height of the second support plate 32 is not higher than the height of the first support plate 31. It should be noted that the sum of the height of the first support plate 31 (its length in the height direction, hereinafter referred to as height) and the height of the second support plate 31 is equal to the fixed column, so that when the lifting column 2 is lowered and not raised, the height of the second support plate 32 is lower than the height of the first support plate 31. In fact, the lower height of the first support plate 31 is the same as the upper height of the second support plate 32, and the sum of the lengths of the first support plate 31 and the second support plate 32 is equal to the length of the fixed column 1.

[0030] Furthermore, when the lifting column 2 is lowered but not raised, the height of the upper end of the lifting column 2 is equal to the height of the upper end of the fixed column 1.

[0031] In this way, the highest point of the fixed column only needs to be 1.6 meters high. The first support plate 31 and the second support plate 32 are both 0.7 meters high. When the second support plate 32 is at its lowest, the bottom of the second support plate 32 is 20 cm high from the platform ground. Of course, the fixed column 1 is actually only 1.4 meters long. The bottom of the fixed column 1 is also equipped with a base 16, which is also 20 cm high. In this way, the overall height of the fixed column 1 is low and the center of gravity is low. Therefore, the high wind pressure of the high-speed train entering the station will have little impact on the fixed column 1, and the fixed column 1 will have little sway and high safety.

[0032] When the lifting column 2 rises along the fixed column 1, the second frame plate 32 rises along the lifting column 2; Finally, when the lifting column 2 rises to its highest point, the height of the second support plate 32 is approximately equal to the height of the first support plate 31. At this time, the second support plate 32 is also raised to the highest point of the lifting column 2, that is, the upper height of the second support plate 32 is equal to the upper height of the lifting column 2, and the lifting column 2 is higher than the height of the fixed column 1.

[0033] This utility model discloses a stable lifting multi-stage safety door structure, which uses multiple plates connected by pull ropes to form a safety door. When the safety door is lowered, it has sufficient protective height, and the height of the fixing column is the same as the sum of the lengths of the multiple plates, which can minimize the height of the fixing column and ensure the safety of the safety door structure. When the safety door is raised, it occupies little space, and the height is still sufficient for passengers to pass through. The whole structure is simple and highly safe.

[0034] Example 2, still as Figures 1 to 6 As shown, this is only one embodiment of the present invention. Based on the first embodiment, in the multi-stage safety door structure for stable lifting and lowering of the present invention, a motor 11 is provided on the fixed column 1, and a traction belt 12 for connecting with the lifting column 2 is provided on the motor 11. When the motor 11 is working, it drives the traction belt 12 to transmit and thereby drive the lifting column 2 to lift and lower.

[0035] Of course, a counterweight 13 is provided at the end of the traction belt 12 away from the lifting column 2. The counterweight 13 plays the role of counterweighting the entire mass of the lifting column 2. When the lifting column 2 is raised, the counterweight 13 is lowered; conversely, when the lifting column 2 is lowered, the counterweight 13 is raised. After this counterweighting, the power of the motor 11 to drive the lifting column 2 to rise and fall is effectively reduced.

[0036] The lifting column 2 includes a hollow frame 201 and a side plate 202 disposed on the side of the hollow frame 201; the first frame plate 31 is disposed inside the hollow frame 201, and the second frame plate 32 is disposed on the side of the hollow frame 201 away from the fixed column 1.

[0037] Of course, the side of the hollow frame 201 is also provided with rope holes for the safety door pull rope to pass through.

[0038] The entire lifting column 2 forms a two-layer structure, and the rope frame 3 also forms a two-layer structure. Multiple frame plates form a lifting structure with two layers of slide rails, and the first frame plate 31 and the second frame plate 32 do not interfere with each other.

[0039] Of course, a first slider 203 is provided on the side of the hollow frame 201 near the fixed column 1; a first slide rail 14 is provided on the fixed column 1 to facilitate the sliding of the first slider 203; a second slider 204 is provided on the side of the second frame 32 near the hollow frame 201, and a second slide rail 23 is provided on the side of the lifting column 2 away from the fixed column 1 to facilitate the sliding of the second slider 204.

[0040] Example 3, still as Figures 1 to 6 As shown, this is only one embodiment of the present invention. Based on any of the above embodiments, in the stable lifting multi-level safety door structure of the present invention, the upper limit plate and the lower limit plate are both disposed on the side plate; the limit sensor is located between the upper limit plate and the lower limit plate; the limit sensor 15 is located between the upper limit plate 205 and the lower limit plate 206.

[0041] When the safety door is fully closed, the lifting column 2 is at its lowest position. At this time, the lower side of the upper limit plate 205 located slightly above the side plate 202 is in contact with the limit sensor 15. At this time, the motor 11 is turned off and no longer drives the lifting column 2 to descend. When the safety door is opened, the lifting column 2 rises upwards, and the upper limit plate 205 disengages from the limit sensor 15; When the safety door is fully open, the lifting column 2 is at its highest position. At this time, the lower limit plate 206 located slightly below the side plate 202 just rises up to the upper side of the lower limit plate 206 and contacts the limit sensor 15. At this time, the motor 11 is turned off and no longer drives the lifting column 2 to rise.

[0042] Example 4, still as Figures 1 to 6 The illustration shown is merely one embodiment of this utility model. Based on any of the above embodiments, this utility model provides a stable lifting multi-stage safety door structure. The lifting column 2 is provided with a fixed pulley 21, and the fixed pulley 21 is provided with a transmission belt 22 for connecting with the second frame plate 32. The end of the transmission belt 22 away from the second frame plate 32 is connected to the fixed column 1.

[0043] When the lifting column 2 rises along the first slide rail 14 of the fixed column 1, the two sides of the fixed pulley 21 are connected to the second support plate 32 respectively. When the fixed column 1 descends relative to the lifting column 2, the second support plate 32 rises relative to the lifting column 2. When the lifting column 2 rises relative to the fixed column 1, the second support plate 32 also rises relative to the lifting column 2. The rising speed of the first support plate 31 is equal to the rising speed of the lifting column 2, and the rising speed of the second support plate 32 is greater than the rising speed of the lifting column 2. The second support plate 32 gradually catches up with the height of the first support plate 31.

[0044] Furthermore, the fixed pulley 21 includes a first fixed pulley 211 and a second fixed pulley 212 coaxially arranged with the first fixed pulley, and the transmission belt 22 includes a first transmission belt 221 connected to the first fixed pulley and a second transmission belt 222 connected to the second fixed pulley. The first transmission belt is connected to the second frame plate 32, and the end of the second transmission belt away from the second frame plate 32 is connected to the fixed column 1.

[0045] If there is only one fixed pulley, then the speed at which the lifting column 2 rises with respect to the fixed column 1 is equal to the speed at which the second support plate 32 rises with respect to the lifting column 2, that is, the speed at which the second support plate 32 rises is twice the speed at which the first support plate 31 rises. After the two fixed pulley mechanisms, the first fixed pulley 211 and the second fixed pulley 212, are coaxially connected, the lifting speed of the second frame plate 32 is related to the diameter ratio of the first fixed pulley 211 and the second fixed pulley 212, as follows: When the diameter ratio of the second fixed pulley 212 to the first fixed pulley 211 is n, then the transmission speed of the second transmission belt 222 is also n times the transmission speed of the first transmission belt 221 (the angular velocities of the first and second fixed pulleys are the same, and the linear velocity is proportional to the radius). Then the speed at which the second support plate 32 rises relative to the lifting column 2 is n times the speed at which the lifting column 2 rises relative to the fixed column 1. Therefore, the rising speed of the second support plate 32 is (1+n) times the rising speed of the first support plate 31.

[0046] In summary, when the diameter of the second fixed pulley 212 is the same as the diameter of the first fixed pulley 211, the speed at which the lifting column 2 rises from the fixed column 1 is still equal to the speed at which the second support plate 32 rises from the lifting column 2, and the speed at which the second support plate 32 rises is twice the speed at which the first support plate 31 rises. When the diameter of the second fixed pulley 212 is greater than the diameter of the first fixed pulley 211, n is greater than 1, and the speed at which the second support plate 32 rises is greater than twice the speed at which the first support plate 31 rises. Conversely, when the diameter of the second fixed pulley 212 is less than the diameter of the first fixed pulley 211, n is less than 1, and the speed at which the second support plate 32 rises is less than twice the speed at which the first support plate 31 rises.

[0047] This allows for the design of different fixed pulley diameter ratios to accommodate varying door opening heights in different regions, ensuring safe door opening.

[0048] Of course, the spacing between the upper limit plate 205 and the lower limit plate 206 needs to be designed.

[0049] For example, during the opening of the safety door, the initial height of the first support plate 31 from the ground is 0.9 meters (i.e., 0.7 meters plus 0.2 meters); the initial height of the second support plate 32 from the ground is 0.2 meters; the high-speed rail platform is located in the north, and the opening height needs to be no less than 1.9 meters, so the final height of the first support plate 31 and the second support plate 32 from the ground must be 1.9 meters, the displacement distance of the first support plate 31 (that is, the lifting column) is 1 meter, and the displacement distance of the second support plate 32 is 1.7 meters; then the distance between the upper limit plate 205 and the lower limit plate 206 needs to be adjusted to 1 meter, and the diameter of the second fixed pulley 212 is 0.7 times the diameter of the first fixed pulley 211.

[0050] For example, during the opening of the safety door, the initial height of the first support plate 31 from the ground is 0.9 meters (i.e., 0.7 meters plus 0.2 meters); the initial height of the second support plate 32 from the ground is 0.2 meters; the high-speed rail platform is located in the south, and the opening height needs to be no less than 1.7 meters. Therefore, the final height of the first support plate 31 and the second support plate 32 from the ground must be 1.7 meters. The displacement distance of the first support plate 31 (i.e., the lifting column) is 0.8 meters, and the displacement distance of the second support plate 32 is 1.4 meters. Therefore, the distance between the upper limit plate 205 and the lower limit plate 206 needs to be adjusted to 0.8 meters, and the diameter of the second fixed pulley 212 is 0.75 times the diameter of the first fixed pulley 211.

[0051] Finally, the fixed column 1, the lifting column 2, the first frame plate 31 and the second frame plate 32 are all integrally formed parts, making the entire platform door structure stronger and safer.

[0052] This utility model discloses a stable lifting multi-stage safety door structure, which uses multiple plates connected by pull ropes to form a safety door. When the safety door is lowered, it has sufficient protective height, and the height of the fixing column is the same as the sum of the lengths of the multiple plates, which can minimize the height of the fixing column and ensure the safety of the safety door structure. When the safety door is raised, it occupies little space, and the height is still sufficient for passengers to pass through. The whole structure is simple and highly safe.

[0053] This utility model is not limited to the specific embodiments described above, and various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made to the above embodiments based on the technical essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A stable lifting multi-stage safety door structure, characterized in that: It includes a fixed column (1), a lifting column (2), and a rope frame (3); the rope frame (3) includes a first frame plate (31) fixedly installed on the top of the lifting column (2) and a second frame plate (32) for sliding up and down along the lifting column (2), and pull ropes are connected to both the first frame plate (31) and the second frame plate (32); the first frame plate (31) and the second frame plate (32) have the same length, and the sum of the lengths of the first frame plate (31) and the second frame plate (32) is equal to the length of the fixed column (1); a limit sensor (15) is provided on the fixed column (1), and an upper limit plate (205) and a lower limit plate (206) are provided on the lifting column (2) for contacting the limit sensor (15).

2. The multi-stage safety door structure for stable lifting and lowering according to claim 1, characterized in that: The lifting column (2) includes a hollow frame (201) and a side plate (202) disposed on the side of the hollow frame (201); the first frame plate (31) is disposed inside the hollow frame (201), and the second frame plate (32) is disposed on the side of the hollow frame (201) away from the fixed column (1).

3. The multi-stage safety door structure for stable lifting and lowering according to claim 2, characterized in that: The hollow frame (201) is provided with a first slider (203) on the side near the fixed column (1); the fixed column (1) is provided with a first slide rail (14) to facilitate the sliding of the first slider (203); the second shelf (32) is provided with a second slider (204) on the side near the hollow frame (201), and the lifting column (2) is provided with a second slide rail (23) on the side away from the fixed column (1) to facilitate the sliding of the second slider (204).

4. The multi-stage safety door structure for stable lifting and lowering according to claim 2, characterized in that: The upper limit plate (205) and the lower limit plate (206) are both disposed on the side plate (202); the limit sensor (15) is located between the upper limit plate (205) and the lower limit plate (206).

5. The multi-stage safety door structure for stable lifting and lowering according to claim 1, characterized in that: A motor (11) is provided on the fixed column (1), and a traction belt (12) for connecting to the lifting column (2) is provided on the motor (11).

6. The multi-stage safety door structure for stable lifting and lowering according to claim 5, characterized in that: A counterweight (13) is provided at the end of the traction belt (12) away from the lifting column (2).

7. The multi-stage safety door structure for stable lifting and lowering according to claim 1, characterized in that: The lifting column (2) is provided with a fixed pulley (21), and the fixed pulley (21) is provided with a transmission belt (22) for connecting with the second frame plate (32). The end of the transmission belt (22) away from the second frame plate (32) is connected to the fixed column (1).

8. The multi-stage safety door structure for stable lifting and lowering according to claim 7, characterized in that: The fixed pulley (21) includes a first fixed pulley and a second fixed pulley coaxially arranged with the first fixed pulley. The transmission belt (22) includes a first transmission belt connected to the first fixed pulley and a second transmission belt connected to the second fixed pulley. The first transmission belt is connected to the second frame plate (32), and the end of the second transmission belt away from the second frame plate (32) is connected to the fixed column (1).

9. The multi-stage safety door structure for stable lifting and lowering according to claim 1, characterized in that: The first frame plate (31) and the second frame plate (32) are provided with a rope fixing block (33) for connecting with the rope.

10. A multi-stage safety door structure for stable lifting and lowering according to claim 1, characterized in that: The fixed column (1), the lifting column (2), the first frame plate (31) and the second frame plate (32) are all integrally formed parts.

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