Downward-turning emergency evacuation door

Abstract

The invention discloses a downward turning type emergency evacuation door which comprises a door leaf, a connecting rod connecting the door leaf and the bottom of a vehicle body and a turning pedal rotationally connected with the middle of the inner side of the door leaf, the connecting rod rotates relative to the door leaf to drive the door leaf to be away from the vehicle body and be put down, and a first gear is arranged at the end, connected with the bottom of the door leaf, of the connecting rod. The door leaf is rotationally connected with the transmission shaft, the second gear, the first gear and the second gear are located at the two ends of the transmission shaft and meshed with the transmission shaft through the third gear and the fourth gear, the second gear and the turnover pedal are connected through the differential part, and the vertical transition state of the turnover pedal and the door leaf serves as an interface, and the second gear drives the turnover pedal to cross the interface through the differential part. And a damper is arranged between the door leaf and the turnover pedal. Multi-gear transmission enables a transmission structure to be hidden, the effective width of the evacuation ramp is guaranteed, gears and a transmission shaft are meshed in the whole process, reset meshing impact is avoided, the overturning pedal is driven by the dead weight, impact is relieved through a damper, and no impact in the whole process is achieved.

Description

Technical Field

[0001] The invention relates to a rail transit door leaf, in particular to a downward-flipping emergency evacuation door. Background Art

[0002] The downward-flipping emergency evacuation door is unfolded and used as a passage from the vehicle body to the platform. The evacuation door is pulled upward and retracted to form a door leaf, forming a closed space inside the vehicle body. As a passage, the evacuation door needs to be equipped with a pedal covering the inner wall of the door leaf, and when it is used as a door leaf, the pedal needs to leave a window position. Therefore, the pedal on the evacuation door is usually a multi-piece splicing structure. When the evacuation door is retracted as a door leaf, the pedal can be folded to form a window.

[0003] In order to realize the lowering and recovery of the evacuation door and the automatic flattening and folding of the pedal, a transmission component is usually arranged on the evacuation door. For example, the invention patent application with publication number CN 118107618 A discloses a downward-flipping integrated escape door, in which the bottom of the door leaf is connected to the bottom of the vehicle body by a connecting rod, and is driven away from the vehicle body by the connecting rod to be lowered and unfolded, and the flip pedal is rotatably connected to the middle part of the inner side of the door leaf, and gears are respectively connected to the two sides of the flip pedal on the hinge shaft between the connecting rod and the door leaf, and the inner side wall of the door leaf is slidably connected to the rack, and the gears are driven by the rack, thereby realizing the automatic flattening and folding of the pedal.

[0004] Considering the passengers in the car, when the evacuation door is lowered, the folding pedal needs to be slowed down or delayed, that is, the folding pedal can only obtain the unfolding power after the door leaf is a certain distance away from the car body or tilted a certain distance relative to the car body, or the folding pedal unfolds significantly slower than the door leaf, CN 1181076 The scheme disclosed in 18A can achieve this differential by disengaging the gear and rack, that is, when the door leaf is lowered, the gear and rack at the flip pedal end are disengaged, and the gear and rack resume meshing after the door leaf is unfolded to a certain angle. However, since the rotation angle of the gear at the door leaf end is smaller than that at the flip pedal end, the rotation speed of the flip pedal end needs to be greater than that of the door leaf end. On the one hand, there is an impact when the gear and rack resume meshing. On the other hand, the rotation speed of the flip pedal end may continue to increase in the later stage to compensate for the stroke difference of the delayed disengagement state. The increase in speed will increase the instantaneous impact of the re-engagement of the gear and rack. Furthermore, when the folding pedal is folded, the gear and rack are already disengaged before the folding pedal resumes folding, and the flip pedal loses its constraint. The acceleration of its own gravity causes the folding pedal to hit the fixed pedal on the door leaf, which has a great impact on the door leaf, and the flip pedal cannot be smoothly flattened or folded. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a downward-folding emergency evacuation door that can achieve structural concealment and ensure that the folding pedal is unfolded and folded without impact throughout the entire process.

[0006] Technical solution: The downward-flipping emergency evacuation door described in the present invention includes a door leaf, a connecting rod connecting the door leaf and the bottom of a vehicle body, and a flip pedal rotatably connected to the middle inner side of the door leaf. The connecting rod rotates relative to the door leaf to drive the door leaf away from the vehicle body and lower it. A first gear is provided at one end connected to the connecting rod and the bottom of the door leaf. The door leaf is rotatably connected to a transmission shaft and a second gear. The first gear and the second gear are located at both ends of the transmission shaft and are meshed with the transmission shaft through a third gear and a fourth gear. The second gear and the flip pedal are connected by a differential, and the interface is a transition state where the flip pedal and the door leaf are vertical. The second gear drives the flip pedal to cross the interface through the differential, and a damper is provided between the door leaf and the flip pedal.

[0007] Preferably, first bevel gears are provided at both ends of the transmission shaft, and the third gear and the fourth gear include second bevel gears, and the second bevel gears are meshed with the first bevel gears.

[0008] Preferably, in order to hide the transmission assembly under the fixed pedal, the third gear and the fourth gear further include at least one spur gear, and one of the spur gears is coaxially connected to the second bevel gear.

[0009] Preferably, in order to reduce the space of the differential connection and avoid affecting the width of the folding pedal, thereby ensuring the width of the evacuation channel, the differential includes a slide groove and a pin shaft. The pin shaft and the slide groove are respectively connected to the second gear and the flip pedal. The pin shaft abuts against one end of the slide groove, the second gear drives the flip pedal to rotate, the flip pedal crosses the interface, and the pin shaft slides in the slide groove.

[0010] Preferably, the pin shaft is connected to the side of the second gear, the slide groove is connected to the side of the flip pedal, the slide groove is an arc-shaped slide groove, and the central angle corresponding to the slide groove is less than 90°.

[0011] Preferably, an elastic buffer is sleeved outside the pin shaft or inside the slide groove.

[0012] Preferably, in order to ensure smooth rotation of the flip pedal throughout the entire process, the rotating shaft of the flip pedal is connected to a damper located on the door leaf, and the damping of the damper is proportional to the input speed. When the flip pedal passes over the interface, the pin slides along the slide groove, and the flip pedal is accelerated by its own gravity. The damping of the damper is proportional to the input speed, thereby reducing the impact caused by gravity acceleration.

[0013] Preferably, in order to amplify the damping of the damper, a fifth gear is provided on the rotating shaft of the flip pedal, the damper has a damping pinion gear, the fifth gear is meshed with the damping pinion gear, and the radius of the fifth gear is greater than that of the damping pinion gear.

[0014] Preferably, the transmission ratio of the first gear end to the second gear end is 1.3-1.0:1.

[0015] Preferably, the transmission ratio of the first gear and the second gear is 1.3-1.1:1.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. The structure is hidden, and the folding pedal is unfolded and folded without impact throughout the whole process: through multi-gear transmission, the transmission structure can be hidden under the fixed pedal, eliminating the occupation of the evacuation channel space, ensuring the effective width of the evacuation ramp, the gears and the transmission shaft are fully meshed, avoiding the impact caused by the return meshing, and after the flip pedal is driven by its own weight, the damper slows down the impact, reduces the impact, and achieves no impact throughout the whole process; 2. The damping is proportional to the speed, and the flip pedal can self-adjust the damping during the acceleration stage of its own weight; 3. The folding pedal is unfolded and folded smoothly throughout the whole process: the present invention In the specification, the movement of the flip pedal is divided into two sections. The first section is driven by the first gear. The first section is constrained and driven by its own weight. The second section is unconstrained. The first section is decelerated through the reduction ratio. The unfolding speed of the folding pedal is much slower than the door leaf, which reduces the impact and avoids the damper from increasing the resistance to the door leaf in reverse, thereby avoiding affecting the passengers in the car. The second section is the gravity acceleration stage to ensure the flattening of the flip pedal. The pedal is unfolded quickly. This process is adjusted by the damper to avoid the folding pedal from hitting the door leaf at the moment of unfolding or folding, causing impact. The folding pedal unfolds and folds smoothly throughout the whole process. 3. The pedal system is adapted to narrow working conditions, with a simple method and convenient debugging and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the downward-flipping emergency evacuation door of the present invention;

[0018] Figure 2 It is a schematic diagram of the transmission structure of the downward-flipping emergency evacuation door when the flip pedal is flattened;

[0019] Figure 3 It is a schematic diagram of the vertical transition state structure of the flip pedal;

[0020] Figure 4 It is a schematic diagram of the damping structure of the downward-flipping emergency evacuation door of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0022] like Figure 1As shown, the flip-down emergency evacuation door of the present invention is mainly composed of a door leaf 23, a frame 24 is arranged inside the door leaf 23, and a pedal is installed on the frame 24. After the door leaf is lowered, the pedal forms an evacuation ramp. The pedal is divided into a fixed pedal 22 and a flip pedal 15. The fixed pedal 22 is located in the lower half of the inner side of the door leaf 23. The flip pedal 15 is a movable pedal, which is hinged to the middle of the frame 24 and can be rotated to the same plane as the fixed pedal 22, that is, in a flattened state, or can be rotated to overlap the fixed pedal 22, in a folded state, to leave space for the window in the upper half of the door leaf 23. The lower half of the door leaf 23 is connected to the bottom of the vehicle body (not shown) through a connecting rod 1. The connecting rod 1 can rotate around the frame 24, and the connecting rod 1 is folded toward the door leaf 23, and the door leaf 23 is recovered and enters the door opening of the vehicle body to form a door leaf; the connecting rod 1 rotates away from the door leaf 23, and the door leaf 23 is lowered to form an evacuation ramp. When lowered, the angle between the connecting rod 1 and the door leaf / frame is less than 180°. A mounting base 2 is provided at the bottom / lower middle portion of the door leaf 23, and the connecting rod 1 is rotationally connected to the mounting base 2 via a pin shaft (not shown), the pin shaft is coaxially connected to the gear 3, and the connecting rod 1 rotates around the door leaf 23, synchronously driving the gear 3 to rotate.

[0023] like Figure 2 , Figure 3 , a transmission shaft 8 and a gear 12 are installed on the inner side wall of the door leaf 23. The transmission shaft 8 is used to transmit the movement of the gear 3 to the gear 12. The transmission shaft 8 is rotatably connected to the inner side of the door leaf 23 through the bearing seat 7, and a drum-shaped gear coupling 9 is provided between the transmission shaft 8; the gear 12 is used to drive the flip pedal 15 to rotate. A differential is provided between the gear 12 and the flip pedal 15. The gear 12 drives the flip pedal 15 to rotate through the differential. The differential has two contact ends. The gear 12 abuts against one of the contact ends, which can drive the flip pedal 15 to rotate in one direction, such as clockwise, by a certain angle, with the transition state where the flip pedal 15 and the door leaf 23 are perpendicular as the interface. The gear 12 drives the flip pedal 15 to cross the interface through the differential. After crossing the interface, the flip pedal 15 is driven by its own weight, the speed is accelerated, and the differential loses its function. After the flip pedal 15 rotates, the contact end of the gear 12 and the differential is replaced, so that the gear 12 can drive the flip pedal 15 to rotate counterclockwise to cross the interface. A damper 21 is provided between the door leaf 23 and the flip pedal 15. The flip pedal 15 is accelerated by its own weight. When it is flattened or folded, it will quickly hit the frame 24 or the fixed pedal 22. The damper 21 is used to reduce the impact of this part of the impact.

[0024] Bevel gears 5 are provided at both ends of the transmission shaft 8, and gears 3 and 12 are located at both ends of the transmission shaft, meshing with the transmission shaft 8 through bevel gears 6. Bevel gears 6 can be directly connected to gears 3 and 12 coaxially, but this will occupy the space in the width direction of the evacuation ramp and reduce the width of the ramp. Therefore, gears 3 and 12 are respectively meshed with both ends of the transmission shaft 8 through gears 4 and 11. Gears 4 and 11 are spur gears, and the number is not less than 1. One of the spur gears is coaxially connected to the bevel gear 6. Multiple gear transmission allows the transmission parts to be hidden under the fixed pedal 22. Gears 12 and 11 are connected to the frame 24 through the mounting seat 10.

[0025] The differential is mainly composed of a slide 14 and a pin 13. The two ends of the slide 14 are closed, and the pin 13 can slide along the slide 14. The pin 13 and the slide 14 are respectively connected to the gear 12 and the side of the flip pedal 15. When the connecting rod 1 is used as the driving force, the pin 13 is located at one end of the slide 14, and the gear 12 drives the flip pedal 15 to rotate through the differential, and the flip pedal crosses the interface. After crossing the interface, the flip pedal 15 is driven by its own weight, and the flip pedal 15 drives the slide to rotate, and the pin 13 slides in the slide. An elastic buffer can be set outside the pin 13 or inside the slide 14 to further reduce the impact on the basis of the damper 21. The pin 13 can be connected to the side of the flip pedal 15, and a slide groove 14 is opened on the gear 12, but the gear 12 is not easy to process. It is best to connect the pin 13 and the gear 12, and the slide groove 14 is connected to the side of the flip pedal 15. The slide groove 14 is an arc-shaped slide groove. To ensure that the flip pedal 15 crosses the interface, the central angle corresponding to the slide groove is less than 90°.

[0026] like Figure 4 The inner side wall of the door leaf 23 is provided with a damper 21, and the rotating shaft of the flip pedal 15 is connected to the damper 21. The damping of the damper 21 is proportional to the input speed. The flip pedal is accelerated by its own gravity, and the damping of the damper is proportional to the input speed, which reduces the impact caused by gravity acceleration. The other side wall of the flip pedal 15 away from the gear 12 is provided with a gear 17, and the damper 21 has a damping sub-gear 19. The gear 17 is meshed with the damping sub-gear 19, and the radius of the gear 17 is larger than the damping sub-gear 19 to amplify the damping of the damper 21.

[0027] The damping of the damper 17 is proportional to the input speed, and is to cooperate with the flip pedal 11 accelerated by its own weight. Gear 3 transmits driving force to gear 12. There are two situations: the speed of gear 3 is greater than that of gear 12, and the speed of gear 3 is less than that of gear 12. When the speed of gear 12 increases, gear 12 needs to be disengaged from the transmission shaft for a period of time to prevent the flip pedal 11 from rising too early when the door leaf is lowered. This will cause meshing impact, which is contrary to the scheme of the present invention. Even if it is not disengaged, the speed of gear 12 increases, and the damping of the damper 17 will increase due to the increase in the speed of gear 12. After feedback to gear 3, it is also a resistance for the lowering of the door leaf, which is not conducive to the lowering of the door leaf. In order to avoid this problem, and at the same time to prevent the flip pedal 15 from rising too early and too quickly when the door leaf is lowered, affecting the passengers in the car, the speed of gear 12 needs to be reduced. Therefore, the reduction ratio between the gear 3 end and the gear 8 end is 1.3-1.0:1, preferably 1.3-1.1:1.

[0028] Door leaf recovery operation: connecting rod 1 rotates around gear mounting seat 2, driving gear 3 and gear 4 to rotate, driving bevel gear 5 to change the power direction, and transmitting the power to bevel gear 6. Bevel gear 6 transmits the driving force to bevel gear 6 and bevel gear 5 at the other end through connecting shaft 8 and drum gear coupling 9, and then transmits the power to gear 11 and gear 12. The pin 13 on gear 12 abuts against one end of slide groove 14, and drives flip pedal 15 to rotate through slide groove 14, and folds from the flattened position toward fixed pedal 22 until flip pedal 15 crosses the interface. Flip pedal 15 is driven to rotate by its own weight, and slide groove 14 rotates with flip pedal 15. Pin 1 3 slides in the slide groove 14; the other side of the flip pedal 15 is connected to the damper 21, and the damper 21 controls the final speed of the flip pedal 15 to prevent the flip pedal 15 from hitting the fixed pedal 22; when the door leaf is lowered, after the evacuation door is unlocked and pushed out of the door frame, the door leaf is continuously released under the action of gravity, similar to the transmission mode when unfolding, the pin shaft 13 on the gear 12 abuts against the other end of the slide groove 14, and the flip pedal 15 is driven to rotate from the folded state to the flattened state through the slide groove 14 until the flip pedal 15 crosses the interface, and the flip pedal 15 is driven to rotate to the flattened state by its own weight. After the flip pedal 15 is driven by its own weight, its speed is controlled by the damper 21 to prevent it from hitting the frame 24.

Claims

1. A downward-flipping emergency evacuation door, comprising a door leaf (23), a connecting rod (1) connecting the door leaf (23) and the bottom of a vehicle body, and a flip pedal (15) rotatably connected to the middle of the inner side of the door leaf, wherein the connecting rod (1) rotates relative to the door leaf (23) to drive the door leaf (23) away from the vehicle body and lowered, characterized in that: A first gear (3) is provided at one end of the connecting rod (1) and the bottom of the door leaf (23); the door leaf is rotatably connected to a transmission shaft (8) and a second gear (12); the first gear and the second gear are located at both ends of the transmission shaft (8) and mesh with the transmission shaft (8) through a third gear (4) and a fourth gear (11); the second gear (12) and the flip pedal are connected through a differential; a transition state perpendicular to the flip pedal (15) and the door leaf (23) is used as an interface; the second gear (12) drives the flip pedal (15) to cross the interface through the differential; and a damper (21) is provided between the door leaf (23) and the flip pedal (15).

2. The downward-folding emergency evacuation door according to claim 1, characterized in that: The transmission shaft (8) is provided with first bevel gears at both ends, and the third gear (4) and the fourth gear (11) include second bevel gears, which are meshed with the first bevel gears.

3. The downward-flipping emergency door according to claim 2, characterized in that: The third gear (4) and the fourth gear (11) further include at least one spur gear, one of which is coaxially connected to the second bevel gear.

4. The downward-flipping emergency door according to claim 1, characterized in that: The differential comprises a slide groove (14) and a pin shaft (13). The pin shaft (13) and the slide groove (14) are respectively connected to the second gear (12) and the flip pedal (15). The pin shaft (13) and one end of the slide groove (14) are in contact with each other. The second gear (12) drives the flip pedal (15) to rotate. When the flip pedal (15) passes over the interface, the pin shaft (13) slides in the slide groove (14).

5. The downward-flipping emergency door according to claim 4, characterized in that: The pin shaft (13) is connected to the side of the second gear (12), the slide groove (14) is connected to the side of the flip pedal (15), the slide groove (14) is an arc-shaped slide groove, and the center angle corresponding to the slide groove (14) is less than 90°.

6. The downward-flipping emergency evacuation door according to claim 4, characterized in that: An elastic buffer is sleeved outside the pin shaft (13) or inside the slide groove (14).

7. The downward-flipping emergency door according to claim 1, characterized in that: The rotating shaft of the flip pedal (15) is connected to a damper (21) located on the door leaf, and the damping of the damper (21) is proportional to the input speed.

8. The downward-flipping emergency evacuation door according to claim 7, characterized in that: A fifth gear (17) is provided on the rotating shaft of the flip pedal (15), and the damper (21) has a damping sub-gear (19). The fifth gear is meshed with the damping sub-gear, and the radius of the fifth gear is greater than that of the damping sub-gear.

9. The downward-flipping emergency door according to claim 7, characterized in that: The transmission ratio between the first gear (3) end and the second gear (12) end is 1.3-1.0:

1.

10. The downward-flipping emergency evacuation door according to claim 9, characterized in that: The transmission ratio between the first gear (3) and the second gear (12) is 1.3-1.1:1.

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