Connecting rod combined lifting structure for folding evacuation ladder of train
By optimizing the movement trajectory of the evacuation ladder through a linkage combination lifting structure, the problem of insufficient space under the new vehicle body in the existing device is solved, realizing the efficient and safe deployment and storage of the evacuation ladder, and meeting the space requirements of the new vehicle body.
Patent Information
- Application Number
- CN202520313131.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-26
AI Technical Summary
When the space under the new car body is insufficient, the existing train evacuation ladder device cannot meet the design requirements of the lifting structure, resulting in a large space occupation of the movement path, serious interference, and inability to carry out evacuation efficiently and safely.
The lifting structure adopts a linkage combination, including a lifting cylinder, a bending linkage, a positioning linkage, and a step assembly. Through the bending design, a reasonable movement trajectory of the step assembly is achieved. The bending linkage design increases the angle between the lever arm and the horizontal direction, resulting in reasonable force distribution.
Without reducing the size of the evacuation ladder, the space under the vehicle is fully utilized to achieve efficient deployment and storage of the step components. The movement trajectory conforms to the specific conditions under the vehicle, the lever arm has a larger angle with the horizontal direction, the force is reasonable, and the space requirements of the new vehicle body are met.
Smart Images
Figure CN223764440U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of train equipment technology, and more specifically, it relates to a linkage combination lifting structure for a train folding evacuation ladder. Background Technology
[0002] With the acceleration of urbanization and the continuous expansion of urban peripheries, the volume of urban population flow has increased dramatically, leading to increasingly severe traffic congestion. Traditional public transportation can no longer meet the daily needs of urban residents. Therefore, urban rail transit, with its large capacity, high speed, and low pollution, has become an effective means of solving urban traffic problems. As people's living standards improve, the demand for public transportation is also constantly growing. With its speed, convenience, and environmental friendliness, urban rail transit is gradually becoming the preferred mode of transportation for urban residents.
[0003] Suburban trains typically operate in urban or suburban environments, where the conditions are complex and varied. The widespread availability of evacuation devices will help improve these trains' ability to respond to emergencies. Traditional evacuation methods usually involve manual evacuation stairs. However, due to limitations in the number of evacuation stairs, this method may not be efficient or safe enough. Evacuation devices located at the bottom of the train have emerged as an innovative solution. These devices allow passengers to quickly evacuate to the ground or a lower evacuation platform via the side doors of the train in emergencies, thereby improving evacuation efficiency and safety.
[0004] Evacuation ladders are mainly used for lateral or front-end evacuation and are suitable for scenarios with a significant height difference between the vehicle and the ground. They typically feature a folding design and are stored under or on the side of the vehicle to save space.
[0005] Existing evacuation ladder systems, such as Figure 6 As shown, the ladder assembly is rotated and swung out in a standard circular motion through a V-shaped support arm structure. The entire movement path occupies a large space. After the cable grooves are set on both sides under the new vehicle body, the space left for the evacuation ladder body is further compressed. The ladder assembly interferes with the cable grooves. Therefore, the existing design can no longer meet the requirements of the new vehicle body and it is necessary to support it. Utility Model Content
[0006] The purpose of this utility model is to provide a linkage combination lifting structure for a train folding evacuation ladder, so that the movement trajectory of the step assembly conforms to the specific conditions under the train. At the same time, the design of the bending linkage also makes the angle between the lever arm and the horizontal direction larger when the lifting cylinder extends to the end, resulting in a more reasonable force distribution.
[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a connecting rod combination lifting structure for a train folding evacuation ladder, comprising a lifting cylinder, a bending connecting rod, a connecting rod assembly, and a step assembly arranged sequentially from the inside to the outside along the mounting frame of the evacuation ladder.
[0008] The linkage assembly includes a positioning linkage, a lifting linkage, and an adjusting linkage;
[0009] The base end of the lifting cylinder, the top end of the bending connecting rod, and the top end of the positioning connecting rod are rotatably connected to the mounting frame.
[0010] The extended end of the lifting cylinder is rotatably connected to the body of the bending connecting rod, the two ends of the lifting connecting rod are rotatably connected to the bottom end of the bending connecting rod and the top of the step assembly, the two ends of the adjusting connecting rod are rotatably connected to the bottom end of the positioning connecting rod and the bottom end of the step assembly, and the body of the positioning connecting rod is rotatably connected to the body of the lifting connecting rod.
[0011] The lateral distance between the lifting cylinder, the bending connecting rod, the connecting rod assembly, and the step assembly is shortened by folding and shifting when the lifting cylinder retracts, and extended by shifting and shifting when the lifting cylinder extends.
[0012] As a preferred embodiment of this utility model, the bending connecting rod is a curved rod body, and the convex side of the bending connecting rod is provided with an outwardly protruding connecting lug. The extended end of the lifting cylinder is rotatably connected to the connecting lug.
[0013] As a preferred embodiment of this utility model, the top end of the positioning link is provided with a bent portion, and the bent portion protrudes toward one side of the bent link.
[0014] As a preferred embodiment of this utility model, the body of the positioning link near the bottom end is rotatably connected to the middle part of the body of the lifting link.
[0015] As a preferred technical solution of this utility model, during the process of the lifting cylinder retracting from its maximum length to its minimum length, the bottom end of the bending connecting rod, the top end of the lifting connecting rod, and the adjusting connecting rod move toward the lifting cylinder and downward, thereby driving the connecting step assembly to move toward the bottom of the mounting frame.
[0016] As the lifting cylinder extends from its minimum length to its maximum length, the bottom end of the bending connecting rod, the top end of the lifting connecting rod, and the adjusting connecting rod move upward toward the outside of the mounting frame, causing the connecting step assembly to move to the side outside the mounting frame.
[0017] In summary, this utility model has the following beneficial effects: Through the linkage combination lifting structure for the train folding evacuation ladder of this utility model, without sacrificing the size of the ladder component itself (i.e., the evacuation ladder), a series of coordinated linkage combinations extend / retract the step component along a clever trajectory, making full use of the space under the vehicle. The movement trajectory of the step component conforms to the specific conditions under the vehicle. Simultaneously, the design of the curved linkage ensures that when the lifting cylinder extends to its full position, the angle between the lever arm and the horizontal direction is larger, resulting in more reasonable force distribution. During unfolding, the lifting cylinder pushes the curved linkage, causing the linkage assembly and the step component to extend along a specific trajectory. Simultaneously, by adjusting the linkage, the angle of the step component is rotated, ensuring that when the lifting cylinder extends to its full position, the step component is at the optimal unfolding angle. The entire movement trajectory has the characteristics of a long horizontal distance and a short vertical distance, perfectly fitting the limited space under the vehicle. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the contracted state of this utility model;
[0019] Figure 2 This is a schematic diagram of the extended state of this utility model;
[0020] Figure 3 This is a schematic diagram of the lifting cylinder of this utility model fully retracted;
[0021] Figure 4 This is a schematic diagram of the lifting cylinder of this utility model not being fully extended;
[0022] Figure 5 This is a schematic diagram of the lifting cylinder of this utility model in full extension;
[0023] Figure 6 This is a schematic diagram of an existing V-shaped load-bearing structure.
[0024] In the diagram: 1. Mounting bracket; 2. Lifting cylinder; 3. Bending connecting rod; 4. Step assembly; 5. Positioning connecting rod; 6. Lifting connecting rod; 7. Adjusting connecting rod; 8. Connecting lug. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0026] like Figure 1 and 2 As shown, this utility model provides a linkage assembly lifting structure for a train folding evacuation ladder, including a lifting cylinder 2, a bending linkage 3, a linkage assembly, and a step assembly 4 arranged sequentially from the inside to the outside along the mounting frame 1 of the evacuation ladder; wherein, the linkage assembly includes a positioning linkage 5, a lifting linkage 6, and an adjusting linkage 7.
[0027] The base end of the lifting cylinder 2, the top end of the bending connecting rod 3, and the top end of the positioning connecting rod 5 are rotatably connected to the mounting frame 1, and are connected sequentially from the inside to the outside at the bottom of the mounting frame 1. The base end of the lifting cylinder 2 is installed on the innermost side of the bottom of the mounting frame 1, the top end of the positioning connecting rod 5 is installed on the outermost side of the bottom of the mounting frame 1, and the top end of the bending connecting rod 3 is installed between the disengagement cylinder and the positioning connecting rod 5.
[0028] The extended end of the lifting cylinder 2 is rotatably connected to the body of the curved connecting rod 3. Specifically, the curved connecting rod 3 is a curved rod body, and the convex side of the body of the curved connecting rod 3 is provided with an outwardly protruding connecting lug 8. The extended end of the lifting cylinder 2 is rotatably connected to the connecting lug 8. The connecting lug 8 is located in the middle of the body of the curved connecting rod 3 near the top, and the entire lifting cylinder 2 is also located on the convex side of the curved connecting rod 3.
[0029] The two ends of the lifting link 6 are rotatably connected to the bottom end of the bending link 3 and the top of the step assembly 4, respectively. The two ends of the adjusting link 7 are rotatably connected to the bottom end of the positioning link 5 and the bottom end of the step assembly 4, respectively. The body of the positioning link 5 and the body of the lifting link 6 are rotatably connected, with the connection position being the body of the positioning link 5 near the bottom and the middle position of the lifting link 6.
[0030] The top of the positioning link 5 is provided with a bent part, which protrudes towards the side of the bent link 3.
[0031] Regarding the step assembly 4, its outer side is used to install the evacuation ladder, its inner top lower position is rotatably connected to the lifting link 6, and its inner bottom position is rotatably connected to the adjusting link 7.
[0032] like Figure 4 As shown, the lateral distance between the lifting cylinder 2, the bending connecting rod 3, the connecting rod assembly, and the step assembly 4 is shortened by folding and shifting when the lifting cylinder 2 retracts; and is extended by shifting and shifting when the lifting cylinder 2 extends.
[0033] Specifically, during the process of the lifting cylinder 2 retracting from its maximum length to its minimum length, the bottom end of the bending connecting rod 3, the top end of the lifting connecting rod 6, and the adjusting connecting rod 7 move downward toward the lifting cylinder 2, thereby driving the step assembly 4 to move toward the bottom of the mounting frame 1.
[0034] When the lifting cylinder 2 is at its minimum length, the bending connecting rod 3, the connecting rod assembly, and the step assembly 4 are in a folded and close-to-each-other state, such as... Figure 3 As shown, the bending link 3, the positioning link 5, and the step assembly 4 are approximately parallel to each other, and the included angle between the positioning link 5 and the lifting link 6 is also at its minimum. At this time, the step assembly 4 is located at the bottom of the mounting frame 1, and the evacuation ladder can be retracted.
[0035] During the process of the lifting cylinder 2 extending from its minimum length to its maximum length, the bottom end of the bending connecting rod 3, the top end of the lifting connecting rod 6, and the adjusting connecting rod 7 move upward toward the outside of the mounting frame 1, thereby driving the step assembly 4 to move to the outside side of the mounting frame 1.
[0036] When the lifting cylinder 2 is at its maximum length, the bending connecting rod 3, the connecting rod assembly, and the step assembly 4 are in a mutually extended state, such as... Figure 5 As shown, the bottom end of the bending link 3 is located at the position furthest from the lifting cylinder 2, which drives the top end of the lifting link 6 to rise. At this time, the body of the positioning link 5 is close to horizontal, so that the bottom end of the positioning link 5 also rises. At this time, under the action of the adjusting link 7, the step assembly 4 is placed in a relatively vertical state. At this time, the step assembly 4 has been moved to the side position of the mounting bracket 1, which is at the same height as the mounting bracket 1.
[0037] The advantages of this utility model are as follows: Through the linkage combination lifting structure of the train folding evacuation ladder of this utility model, without sacrificing the size of the ladder component itself, that is, the evacuation ladder, the step component 4 is extended / retracted in a clever trajectory through a series of coordinated linkage combinations, making full use of the space under the vehicle. The movement trajectory of the step component 4 conforms to the specific situation under the vehicle. At the same time, the design of the bending linkage 3 also makes the angle between the lever arm and the horizontal direction larger when the lifting cylinder 2 is extended to the full position, and the force is more reasonable. When unfolding, the lifting cylinder 2 pushes the bending linkage 3, which drives the linkage assembly and the step component 4 to extend along a specific trajectory. At the same time as the step component 4 is extended, the angle of the step component 4 is rotated by the adjusting linkage 7, so that when the lifting cylinder 2 is extended to the full position, the step component 4 is just at the optimal unfolding angle. The entire movement trajectory has the characteristics of long horizontal distance and short vertical distance, which perfectly fits the limited space under the vehicle.
[0038] like Figure 3-6 A comparison shows that when applied to the latest vehicle bodies, the linkage combination lifting structure of this utility model, during the movement from the retracted state to the extended state, achieves a longer horizontal extension distance due to the combined action of the lifting cylinder, bending link, and jacking link. Furthermore, throughout the entire extension and retraction process, the lowest point of the entire linkage combination lifting structure is the bending link. When the bending link rotates, the path at its bottom is the lowest point. Since the driving point of the bending link is on the convex arc side, the vertical trajectory drop height of the evacuation ladder installed on the linkage combination lifting structure at the bottom of the mounting frame is significantly less than that of the existing V-shaped load-bearing arm type. This satisfies the need to avoid cable trays while shortening the vertical movement trajectory height, resulting in more rational and efficient use of the space at the bottom of the mounting frame.
[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A linkage assembly lift structure for a train folding evacuation ladder, characterized by: It comprises a lifting cylinder (2), a curved link (3), a link assembly, a step assembly (4) arranged in sequence from inside to outside along the mounting rack (1) of the evacuation ladder. The link assembly comprises a positioning link (5), a jacking link (6), and a position adjusting link (7). The base end of the lifting cylinder (2), the top end of the curved link (3), and the top end of the positioning link (5) are rotatably connected with the mounting rack (1). The extending end of the lifting cylinder (2) is rotatably connected with the body of the curved link (3), the two ends of the jacking link (6) are rotatably connected with the bottom end of the curved link (3) and the top of the step assembly (4), the two ends of the position adjusting link (7) are rotatably connected with the bottom end of the positioning link (5) and the bottom end of the step assembly (4), and the body of the positioning link (5) is rotatably connected with the body of the jacking link (6). The transverse distance between the lifting cylinder (2), the curved link (3), the link assembly, and the step assembly (4) is folded and shortened when the lifting cylinder (2) is contracted, and is displaced and extended when the lifting cylinder (2) is elongated.
2. The linkage assembly lift structure for a train folding evacuation ladder according to claim 1, characterized in that: The curved link (3) is an arc-shaped rod body, and the convex arc side body of the curved link (3) is provided with an outward convex connecting lug (8), and the extending end of the lifting cylinder (2) is rotatably connected with the connecting lug (8).
3. The linkage assembly lift structure for a train folding evacuation ladder according to claim 2, characterized in that: The top end of the positioning link (5) is provided with a bent portion which protrudes towards one side of the curved link (3).
4. The linkage assembly lift structure for a train folding evacuation ladder according to claim 3, wherein: The body position close to the bottom end of the positioning link (5) and the middle part of the body of the jacking link (6) are rotatably connected.
5. The linkage assembly lift structure for a train folding evacuation ladder according to claim 4, wherein: During the process of the lifting cylinder (2) from the maximum length contraction to the minimum length, the bottom end of the curved link (3), the top end of the jacking link (6), and the position adjusting link (7) move towards the direction of the lifting cylinder (2) and downward, driving the step assembly (4) to move towards the bottom of the mounting rack (1). During the process of the lifting cylinder (2) from the minimum length elongation to the maximum length, the bottom end of the curved link (3), the top end of the jacking link (6), and the position adjusting link (7) move towards the outside direction of the mounting rack (1) and upward, driving the step assembly (4) to move towards the side surface outside the mounting rack (1).