Automatic unfolding evacuation ramp

Abstract

The automatic unfolding evacuation ramp comprises a folding ramp assembly, a supporting leg assembly on the bottom face of the ramp assembly and an extension pedal hinged to the front end of the ramp assembly, and when the ramp assembly is unfolded, the supporting leg assembly is unfolded and stretches out; a first torsional spring is arranged between the ramp assembly and the extending pedal, a lock hook assembly and a lock stop assembly which are rotationally connected are arranged on the two sides of the ramp assembly respectively, the lock hook assembly can hook the extending pedal in a folded state, and a second torsional spring is arranged between the lock stop assembly and the ramp assembly. The bottom of the stopper assembly extends to the side, extending out of the ramp assembly, of the supporting leg assembly, when the ramp assembly is folded, the supporting leg assembly is folded, the ramp assembly pushes the latch hook to be separated from the extension pedal, and the stopper assembly is released by the supporting leg assembly and replaces the latch hook assembly to hook the extension pedal. According to the scheme, rapid unfolding and barrier-free evacuation can be achieved at the same time.

Description

Technical Field

[0001] The invention relates to a rail transit pedal, in particular to an automatically deployed evacuation ramp. Background Art

[0002] In the rail transit evacuation door system, there are two ways to combine the door leaf and the ramp, the door leaf of the integrated door slope type and the door leaf of the separated door slope type flips down. The door leaf of the integrated door slope type flips down with the ramp, and the evacuation ramp has poor bearing capacity and weak evacuation capacity. The door leaf of the separated door slope type flips up, and the evacuation ramp can be directly supported on the rails on the ground, with a large width and strong bearing capacity, which is convenient for passengers to evacuate quickly. In the existing evacuation door system, the evacuation ramp is mostly a folding ramp to avoid blocking the evacuation door glass. For example, the invention patent application with publication number CN 116588156 A discloses an automatically releasable emergency evacuation ramp device. The end of this evacuation ramp lacks an extension pedal, and the evacuation ramp and the platform cannot directly transition smoothly, and barrier-free evacuation cannot be achieved. The invention patent application with publication number CN 107600089 A discloses a recovery mechanism for an emergency escape ramp of a rail transit vehicle. At the end of the ramp, a compensating pedal body is provided to increase the length of the ramp, but the problem of barrier-free evacuation cannot be solved. The compensating pedal body needs to be driven and unfolded by an additional driving device, and the unfolding speed is slow. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide an automatically deployable evacuation ramp to simultaneously solve the problems of rapid deployment and barrier-free evacuation.

[0004] Technical solution: The automatically unfolding evacuation ramp described in the present invention comprises a folding ramp assembly, a leg assembly on the bottom surface of the ramp assembly, and an extension pedal hinged to the front end of the ramp assembly. When the ramp assembly is unfolded, the leg assembly is unfolded and extended. A first torsion spring is provided between the ramp assembly and the extension pedal. A rotatably connected lock hook assembly and a lock stop assembly are provided on both sides of the ramp assembly. The lock hook assembly can hook the extension pedal in a folded state. A second torsion spring is provided between the lock stop assembly and the ramp assembly. The bottom of the lock stop assembly extends to the side where the leg assembly extends out of the ramp assembly. When the ramp assembly is folded, the leg assembly is folded, the ramp assembly pushes the lock hook to disengage from the extension pedal, the lock stop assembly is released by the leg assembly, and takes over the lock hook assembly to hook the extension pedal.

[0005] Preferably, a roller is connected to the locking end of the locking block assembly, and when the leg assembly is extended, the leg assembly pushes the locking block to rotate through the roller to release the extension pedal.

[0006] Preferably, the top surface of the lock hook of the lock hook assembly is an inclined surface, and the lock hook is rotatably connected to the inner side of the ramp assembly through a bracket.

[0007] Preferably, in order to ensure a smooth transition between the extension pedal and the secondary ramp, pads for limiting the rotation angle of the extension pedal are provided at both ends of the hinged side of the extension pedal.

[0008] Preferably, in order to prevent the lock hook from failing during the folding process of the ramp assembly, the ramp assembly includes a primary ramp and a secondary ramp, the frames of the primary ramp and the secondary ramp are hinged by a first hinge shaft, the primary ramp or the secondary ramp at both ends of the first hinge shaft is provided with a first connecting member for driving the ramp assembly to fold, the primary ramp and the secondary ramp are provided with a fixed pedal at one end away from the first hinge shaft, and a flap is provided at one end close to the first hinge shaft, the flap and the fixed pedal are hinged, when the first connecting member drives the primary frame to rotate toward the vehicle body, the primary frame and the secondary frame are folded in reverse, the flap and the fixed pedal are folded forward, and the lock hook assembly and the lock block assembly are located on both sides of the fixed pedal of the secondary ramp. During the folding process, the upper surfaces of the flap and the fixed pedal are close to each other, and the evacuation ramp is folded through a nearly "W"-shaped transition state. In this case, the angle of rotation of the lock block with the secondary frame is less than 180°, so as to avoid the lock block from experiencing an upside-down state, and eliminate the failure of the lock block assembly caused by gravity.

[0009] Preferably, the flap and the fixed pedal are hinged through a second hinge shaft, and small gears are respectively provided at both ends of the second hinge shaft. Large gears are respectively provided on the frames on both sides of the middle of the first-level ramp and the second-level ramp, and the large gears have local teeth. When the ramp assembly is folded, the local teeth of the large gear are meshed with the small gear.

[0010] Preferably, the connecting rod assembly is located on both sides of the ramp assembly, including a first connecting rod connected to the vehicle body, a second connecting rod connected to the shafts of the large gears on both sides of the first ramp, and a third connecting rod connected to the shafts of the large gears on both sides of the second ramp; the first connecting rod is located above the first ramp, the third connecting rod is located below the second ramp, and both ends of the second connecting rod are hinged to the first connecting rod and the second connecting rod respectively.

[0011] Preferably, when the ramp assembly is folded, in order to enable the leg assembly to be stacked between the primary frame and the secondary frame and reduce the space occupied by the leg assembly, the leg assembly is a parallelogram connecting rod structure, located on both sides below the fixed pedal of the secondary ramp, one side of the leg assembly extending out of the ramp assembly is connected to the third connecting rod through the second connecting member, and the other side is connected to the ramp assembly through a tension spring, and when the ramp assembly is folded, the tension spring pulls the leg assembly to fold. When the evacuation ramp is unfolded, the second connecting member overcomes the elastic force of the tension spring and pulls the leg assembly to unfold.

[0012] Preferably, in order to achieve synchronous deployment of the leg assemblies on both sides of the ramp assembly, an axle rod is provided between the third connecting rods on both sides of the evacuation ramp, the second connecting member is connected to the axle rod, and a plurality of guide wheels guiding the direction of the second connecting member are provided at the bottom of the second frame.

[0013] Preferably, a first pin for connecting to a second connecting member is provided on one side of the leg assembly extending out of the ramp assembly, and a second pin for connecting to a tension spring is provided on the other side, the distance between the first pin and the fixed pedal is greater than the distance between the second pin and the fixed pedal, and notches are provided on both sides of the base plate, and when the leg assembly is folded, the first pin and the hinge axis of the leg assembly are located in the notches.

[0014] Preferably, notches are provided on both sides of the bottom plate, and when the leg assembly is folded, the first pin shaft and the hinge shaft of the leg assembly are located in the notches.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. One-touch deployment and barrier-free evacuation: before the ramp is folded, the lock hook assembly is manually rotated, and the lock hook assembly overcomes the resistance of the extension pedal torsion spring to keep the extension pedal in a folded state. At the end of the folding of the ramp assembly, the secondary ramp flap or the primary frame of the ramp assembly hits / squeezes the lock hook assembly to release the extension pedal. At the same time, the leg assembly is folded and recovered to release the lock block assembly, and the lock block assembly replaces the lock hook assembly to hook the extension pedal. During the next evacuation ramp deployment process, the lock block assembly prevents the extension pedal from being deployed too early. At the end of the next evacuation ramp deployment and after the leg assembly is deployed, the leg assembly pushes the lock block assembly to release the extension pedal, and the extension pedal pops open to form a barrier-free passage; 2. Simple structure, small size, no electric or pneumatic drive device required; 3. A smooth transition between the secondary ramp and the platform is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the assembly structure of the automatically deployable evacuation ramp of the present invention;

[0017] Figure 2 It is a schematic diagram of the unfolded state of the automatically unfolded evacuation ramp structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the folded state of the automatically deployable evacuation ramp structure of the present invention;

[0019] Figure 4 A schematic diagram of the primary ramp structure of the automatically deployed evacuation ramp of the present invention;

[0020] Figure 5 A schematic diagram of the secondary ramp structure of the automatically deployable evacuation ramp of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the connecting rod assembly of the automatic deployment evacuation ramp of the present invention;

[0022] Figure 7 It is a schematic diagram of the extended pedal structure of the automatically deployed evacuation ramp of the present invention;

[0023] Figure 8A bottom view of the lock hook assembly structure of the automatic deployment evacuation ramp of the present invention;

[0024] Fig. 9 A top view of the lock hook assembly structure of the automatic deployment evacuation ramp of the present invention;

[0025] Fig.10 A schematic diagram of the unlocking principle of the lock hook assembly of the automatically deployed evacuation ramp of the present invention;

[0026] Fig.11 A bottom view of the locking assembly structure of the automatically deployable evacuation ramp of the present invention;

[0027] Fig.12 A top view of the locking assembly structure of the automatically deployed evacuation ramp of the present invention;

[0028] Fig.13 It is a schematic structural diagram of the leg assembly of the automatic deployable evacuation ramp of the present invention in the deployed state;

[0029] Fig.14 It is a structural schematic diagram of the assembled state of the leg assembly of the automatically deployable evacuation ramp of the present invention;

[0030] Fig.15 It is a schematic structural diagram of the leg assembly of the automatically deployed evacuation ramp of the present invention in a folded state. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0032] like Figure 1 , Figure 1 A connecting rod 132 is omitted, and the emergency evacuation door system is mainly composed of an evacuation ramp 1, a door leaf 2, and a door frame assembly 3. The door frame assembly 3 is used to connect with the vehicle body and is a supporting structure. The door leaf 2 is hinged at the top of the door frame assembly 3, and the ramp assembly 1 is hinged at the bottom of the door frame assembly 3.

[0033] like Figure 2 , Figure 3 The ramp assembly 1 is mainly composed of a primary ramp 11 and a secondary ramp 12. The primary ramp 11 and the secondary ramp 12 have similar structures and are both based on a rectangular frame. The frame of the primary ramp 11 is a primary frame 111, and the frame of the secondary ramp 12 is a secondary frame 121. The primary frame 111 and the secondary frame 121 are connected together at the top through a hinge shaft 1141. The primary frames at both ends of the hinge shaft 1141 are provided with connecting parts 4 for driving the primary frame 111 to rotate.

[0034] like Figure 4The end of the primary frame 111 away from the hinge shaft 1141 is a fixed pedal 112, and the end close to the hinge shaft 120 is a flap 113. The flap 113 is a movable plate. The flap 113 and the primary fixed pedal 112 are hinged through the hinge shaft 110. The flap 113 is fixedly connected to the hinge shaft 110, and the flap 113 can be rotated to overlap with the fixed pedal 112.

[0035] Pinions 119 are connected to the two ends of the hinge shaft 110 through shafts, and large gears 118 are installed in the middle of both sides of the middle of the primary frame 111. The large gears 118 have only partial teeth. When the ramp assembly 1 is unfolded and rotated to a certain angle, the partial teeth of the large gear 118 mesh with the small gear 119, and the flap 113 is driven to rotate through the small gear 119, so that the flap 113 can pass the upright transition position (the center of the flap 113 overlaps with the plane of the flap 113) and lay flat on the primary ramp; when the ramp assembly 1 is folded and rotated to a certain angle, the large gear 118 applies driving force to the small gear 119, so that the flap 113 can be separated from the primary frame 111 and rotated to overlap with the fixed pedal 112. At the initial and final stages of the rotation of the ramp assembly 1, the large gear 118 can be disengaged from the small gear 119. The shaft of the large gear 118 is connected to the connecting rod 138. When the ramp assembly is folded or unfolded, the large gear 118 is driven to rotate by the connecting rod 138, so that the large gear 118 can drive the small gear 119 to drive the hinge shaft 110 to rotate, thereby driving the primary flap 113 to rotate, so that the flap 113 overlaps with the fixed pedal 112. There is an idle stroke during the meshing process between the small gear 111 and the large gear 118, and the folding speed of the flap 113 will change from slow to fast, so as to ensure that the flap 113 will automatically fall onto the fixed pedal 112 under its own weight after passing the center of gravity.

[0036] Dampers 116 are installed on the left and right sides of the primary frame 111. The dampers 116 are rotary dampers. The dampers 116 are connected to the flap 112. When the flap 113 is unfolded, due to the setting of the dampers 116, there is an obvious buffering during the falling process of the unfolding process, ensuring that the flap 113 unfolds smoothly. The end of the primary frame 111 close to the secondary frame 121 is the top end, and there is a cross beam 114. The cross beam 114 is used to connect with the hinge shaft 120.

[0037] The first-level frame 111 has a reinforcing plate in the middle of the longitudinal beam equipped with a large gear 118, and both ends of the reinforcing plate are connected to the longitudinal beam through threaded blocks 117. The first-level frame 111 is bent near the rear end of the frame assembly 1, and mounting seats 1112 and 1111 are installed on both sides of the rear end. The mounting seat 1112 is used to connect the damping spring 17, and the other end of the damping spring 17 is fixed in the door frame assembly 3. The mounting seat 1111 is used to connect the gas spring 6, and the other end of the gas spring 6 is installed on the door frame assembly 3. The damping spring 17 and the gas spring 6 are installed symmetrically on the left and right to ensure that the ramp assembly 1 is fully released.

[0038] like Figure 5Consistent with the first-level ramp 11, the second-level ramp 12 corresponds to a structural second-level frame 121, a fixed pedal 122, and a flap 123. The fixed pedal 122 and the flap 123 are hinged through a hinge shaft 120, and the flap 123 is fixedly connected to the hinge shaft 120. The two ends of the hinge shaft 120 are connected to a small gear 129 through an axis. Large gears 128 are installed on both sides of the middle of the second-level frame 121. The large gear 128 has only partial teeth. The axis of the large gear 128 is connected to a connecting rod 132. During the ramp recovery process, the large gear 128 starts to rotate through the action of the connecting rod 132. Dampers 126 are provided on the left and right sides of the secondary frame 121, and the dampers 126 are connected to the flap 123. The end of the secondary frame 121 close to the primary frame 111 is the top, and the crossbeam 124 is installed at the top of the secondary frame 121, which is used to connect the hinge shaft 1141, so as to be hinged with the primary frame 111. A reinforcing plate is provided in the middle of the longitudinal beam of the primary frame 111 where a large gear 128 is installed, and both ends of the reinforcing plate are respectively connected to the longitudinal beam through threaded blocks 127. An extended pedal 16 is provided at the bottom of the secondary frame 121, and a leg assembly 15 is provided on the bottom surface.

[0039] like Figure 6 The connecting rod assembly 13 is symmetrically arranged on both sides of the primary and secondary ramps. The connecting rod assembly 13 includes connecting rods 137, 138, and 132 which are hinged in sequence. The connecting rod 137 is located above the primary ramp 11, and its end is connected to the synchronous support 133 through an axis. The synchronous support 133 is installed on the door frame assembly 3. The connecting rod 132 is located below the secondary ramp 12. The connecting rod 137 and the connecting rod 132 are connected through the connecting rod 138, and the connecting rods 137 and 138 are connected through the hinge shaft 134. The connecting rod 138 is connected to the axis of the large gear 118 of the primary ramp 11, driving the large gear 118 to rotate. The end of the connecting rod 132 is connected to the axis of the large gear 128 of the secondary ramp 12, driving the large gear 128 to rotate.

[0040] The connecting rods 138 and 132 on both sides of the evacuation ramp are connected by the same shaft 130. There is a shaft 135 between the connecting rods 138 on both sides of the evacuation ramp, and there is a shaft 131 between the connecting rods 132 on both sides of the evacuation ramp. When the ramp is unfolded, the shafts 135, 131, and 130 are located at the bottom of the ramp assembly 1. During the folding and unfolding of the ramp, the connecting rod assembly will move synchronously, so that the entire device moves stably and orderly.

[0041] The extension pedal 16 is hinged at the end of the ramp assembly 1, such as Figure 7The extension pedal 16 is composed of a last pedal 163, a torsion spring 167, a pin 168, etc. There is an anti-slip sticker 164 on the last pedal 163, and the last pedal 163 is hinged to the bottom of the secondary frame 121 through the pin 168. There is a torsion spring 167 between the last pedal 163 and the secondary frame 121. Under the action of the torsion spring 167, the last pedal 163 can be popped out and placed on the ground. The function of the extension pedal 16 is to allow people with limited mobility in wheelchairs to escape to the ground and achieve barrier-free evacuation. The last pedal 163 at both ends of the pin 168 is connected to a pad 166 through a connecting block 165. The pad 166 is used to limit the expansion angle of the extension pedal 16, so that when the extension pedal 16 is expanded, the extension pedal 16 and the secondary ramp 12 are approximately in the same plane, achieving a smooth transition between the secondary ramp and the platform.

[0042] The fixed pedal 122 of the secondary frame 121 is provided with a locking hook assembly 19 and a locking block assembly 10 on both sides. Both the locking hook assembly 19 and the locking block assembly 10 can hook the extension pedal 16 in the folded state.

[0043] like Figure 8 , Fig. 9 The top surface of the lock hook 191 of the lock hook 19 assembly is an inclined surface. The lock hook 191 is rotatably connected to the inner side of the secondary frame 121 through a bracket 192 and a shaft 194. Both ends of the bracket 192 are fixed by nuts 193. Before the ramp assembly 1 is folded, the lock hook 191 is manually rotated to hook the extended pedal 16 in the folded state. Fig.10 When the ramp assembly 1 is folded, the flap 123 is driven by the connecting rod assembly 3 to rotate to overlap with the fixed pedal 122, and will hit the top of the lock hook 191, and push the lock hook 191 away from the extension pedal 16 through the inclined surface of the lock hook 191. Fig.11 , Fig.12 The lock gear 101 of the lock gear assembly 10 is rotatably connected to the inner side of the secondary frame 121 through the bracket 103. There is a torsion spring 105 between the lock gear 101 and the frame of the secondary ramp. The lock gear 101 is a bent part, and the bottom extends to the bottom of the secondary ramp 12, close to the leg assembly 15. The ramp assembly 1 is folded and retracted, the leg assembly 15 is pulled back, the lock gear 101 is released, and the lock hook 191 is replaced to hook the extension pedal 16. When the ramp assembly 1 is unfolded next time, the leg assembly 15 is driven to extend by the connecting rod assembly 13, and the leg assembly 15 squeezes the bottom of the lock gear 101, pushing the lock gear 101 to rotate, so that the lock gear 101 releases the extension pedal 16, and the extension pedal 16 can be automatically unfolded under the action of the torsion spring 167. The bottom of the lock block 101 is connected to an extension plate 104 , and the end of the extension plate 104 is connected to a roller 102 , which is close to the leg assembly 15 . When the ramp assembly 1 is folded, the roller 102 is lifted up by the rod 152 of the leg assembly 15 , driving the lock block 101 to release the extension pedal 16 .

[0044] like Figure 6 , Fig.14 , Fig.15 The leg assembly 15 is a parallelogram structure. The two ends of the bottom plate 151 are respectively hinged to the rod 152 and the rod 153 through the shaft 1512 and the shaft 1513. The rod 152 and the rod 153 are respectively hinged to the support tube 154 through the shaft 1523 and the shaft 1533. The bottom plate 151 of the leg assembly 15 is installed under the secondary ramp 12. The leg assemblies 15 are respectively located on both sides of the fixed pedal 122 and staggered a certain distance front and back. Figure 5 Taking the leg assembly 15 on the upper middle side as an example, there is a pin shaft 1531 on the rod 153, one end of the wire rope 156 is connected to the synchronization shaft 131, and the other end passes around a plurality of rollers 150 at the bottom of the secondary frame 121 to guide the direction of the wire rope 156 and is installed on the pin shaft 1531. When the ramp assembly 1 is unfolded, Figure 2 , the synchronous shaft 131 moves away from the extension pedal 16, pulling the wire rope 156 backward, and the wire rope 156 drives the rod 153 to rotate around the bottom plate 151, so that the support tube 154 extends out of the bottom of the secondary ramp 12; the rod 152 squeezes the roller 102, pushing the lock gear 101 to rotate and release the extension pedal 16; there is a pin 1521 on the rod 152, and the tension spring 157 at the bottom of the lower side of the secondary ramp 12 is connected to the pin 1521. When the ramp assembly 1 is folded, as shown in FIG. Figure 3 , the synchronous shaft 131 is close to the extension pedal 16, the wire rope 156 loses its tension, and the tension spring 157 pulls the support tube 154 to retract and overlap with the bottom of the secondary ramp 12, reducing its volume. When the evacuation ramp is folded, the leg assembly 15 is folded and located between the primary ramp 11 and the secondary ramp 12. The distance between the pin 1521 and the bottom plate 151 is greater than the distance between the pin 1521 and the bottom plate 154. Notches are provided on both sides of the bottom plate 151. When the leg assembly 15 is folded, the pin 1532 and the shaft 1533 are in the notches. The leg assemblies 15 on both sides of the secondary ramp 12 are symmetrically arranged, staggered a certain distance front and back.

Claims

1. An automatically deployable evacuation ramp, comprising a foldable ramp assembly (1), a leg assembly (15) on the bottom surface of the ramp assembly (1), and an extension pedal (15) hinged to the front end of the ramp assembly, wherein when the ramp assembly is deployed, the leg assembly (15) is deployed and extended; characterized in that: A first torsion spring (167) is provided between the ramp assembly (1) and the extension pedal (16); a rotatably connected lock hook assembly (19) and a lock block assembly (10) are provided on both sides of the ramp assembly (1), respectively; the lock hook assembly (19) is capable of hooking the extension pedal (16) in a folded state; a second torsion spring is provided between the lock block assembly (10) and the ramp assembly; the bottom of the lock block assembly (10) extends to a side of the leg assembly (15) extending out of the ramp assembly; when the ramp assembly is folded, the leg assembly is folded, the ramp assembly pushes the lock hook to detach from the extension pedal, the lock block assembly is released by the leg assembly, and takes over the lock hook assembly to hook the extension pedal.

2. The automatically deployable evacuation ramp according to claim 1, characterized in that: The end of the lock block (101) of the lock block assembly (10) is connected to a roller (102); when the leg assembly (15) is extended, the leg assembly (15) pushes the lock block (101) to rotate via the roller (102), thereby releasing the extension pedal (16).

3. The automatically deployable evacuation ramp according to claim 1, characterized in that: The top surface of the locking hook (191) of the locking hook assembly (19) is an inclined surface.

4. The automatically deployable evacuation ramp according to claim 1, characterized in that: Pads (166) for limiting the rotation angle of the extension pedal are provided at both ends of the hinged side of the extension pedal.

5. The automatically deployable evacuation ramp according to claim 1, characterized in that: The ramp assembly (1) comprises a primary ramp (11) and a secondary ramp (12), the frames of the primary ramp and the secondary ramp are hinged via a first hinge shaft (1141), a first connecting member (4) for driving the ramp assembly to fold is provided on the primary ramp or the secondary ramp at both ends of the first hinge shaft, a fixed pedal is provided at one end of the primary ramp (11) and the secondary ramp (12) away from the first hinge shaft, and a flap is provided at one end close to the first hinge shaft, the flap and the fixed pedal are hinged, when the first connecting member drives the primary frame to rotate toward the vehicle body, the primary frame and the secondary frame are folded in reverse, and the flap and the fixed pedal are folded in forward direction, and the locking hook assembly (19) and the locking gear assembly (10) are located on both sides of the fixed pedal of the secondary ramp (12).

6. The automatically deployable evacuation ramp according to claim 5, characterized in that: The flap and the fixed pedal are hinged via a second hinge shaft, and small gears are respectively arranged at both ends of the second hinge shaft. Large gears are respectively arranged on the frames on both sides of the middle of the first ramp and the second ramp, and the large gears have partial teeth. When the ramp assembly (1) is folded, the partial teeth of the large gear are meshed with the small gear.

7. The automatically deployable evacuation ramp according to claim 6, characterized in that: The connecting rod assembly (13) is located on both sides of the ramp assembly, and comprises a first connecting rod (137) connected to the vehicle body, a second connecting rod (138) connected to the shafts of the large gears on both sides of the primary ramp, and a third connecting rod (132) connected to the shafts of the large gears on both sides of the secondary ramp; the first connecting rod (137) is located above the primary ramp, the third connecting rod (132) is located below the secondary ramp, and two ends of the second connecting rod (138) are respectively hinged to the first connecting rod and the second connecting rod.

8. The automatically deployable evacuation ramp according to claim 7, characterized in that: The leg assembly (15) is a parallelogram connecting rod structure and is located on both sides below the fixed pedal of the secondary ramp. One side of the leg assembly (15) extending out of the ramp assembly is connected to the third connecting rod (132) via a second connecting member (156), and the other side is connected to the ramp assembly via a tension spring. When the ramp assembly is folded, the tension spring pulls the leg assembly to fold.

9. The automatically deployable evacuation ramp according to claim 8, characterized in that: A first pin shaft (1531) for connecting to a second connecting member (156) is provided on one side of the leg assembly (15) extending out of the ramp assembly, and a second pin shaft (1521) for connecting to a tension spring is provided on the other side. The distance between the first pin shaft and the fixed pedal is greater than the distance between the second pin shaft and the fixed pedal. Notches are provided on both sides of the bottom plate (151). When the leg assembly is folded, the first pin shaft and the hinge axis of the leg assembly are located in the notches.

10. The automatically deployable evacuation ramp according to claim 8, characterized in that: An axle rod (131) is provided between the third connecting rods (132) located on both sides of the ramp assembly, the second connecting member (156) is connected to the axle rod (131), and a plurality of rollers for guiding the direction of the second connecting member (156) are provided at the bottom of the secondary ramp (12).

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