Gear self-speed-limiting system and emergency escape system

Abstract

The utility model discloses a gear self-speed-limiting system and an emergency escape system, the gear self-speed-limiting system is connected with a handrail track for emergency escape, the gear self-speed-limiting system can comprise a rolling wheel, a first gear, a transmission gear and a rotating disc, and the rolling wheel is connected with the handrail track in a matched mode. The first gear and the rolling wheel are coaxially arranged, the first gear and the rolling wheel are arranged at an interval through a bearing and connected with each other through a spline, and the first gear rotates along with rotation of the rolling wheel. The transmission gear is rotationally connected with the first gear and can be meshed with the first gear through respective gears. The rotating disc is rotationally connected with the transmission gear and can be meshed with the transmission gear through respective gears. When the rolling wheel rotates, the first gear, the transmission gear and the rotating disc are sequentially driven to rotate. And a plurality of gears, rollers and the like of the gear self-speed-limiting system are matched, so that the speed can be effectively controlled in the connecting and running process of the rollers and the handrail track, and the running safety and stability of the device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of emergency devices, and in particular to a gear self-speed limiting system and an emergency escape system. Background Art

[0002] To address fire safety concerns in my country's urban high-rise buildings and address shortcomings in self-rescue and escape facilities, emergency escape devices are being developed to enable rapid escape. However, the speed control of the gear self-limiting system in the emergency escape system is unstable, impacting its safety. Utility Model Content

[0003] In view of this, the present application provides a gear self-speed limiting system and an emergency escape system to solve the problem in the prior art that the speed control of the gear self-speed limiting system of the emergency escape system is unstable, thereby affecting the safety of the emergency escape system.

[0004] In order to solve the above technical problems, the first technical solution provided in this application is: to provide a gear self-speed limiting system for an emergency escape device, which is connected to a handrail track for emergency escape; it includes: a roller, a first gear, a transmission gear and a rotating disk, and the roller is matched and connected to the handrail track; the first gear is coaxially arranged with the roller and rotates with the rotation of the roller; the transmission gear is rotationally connected to the first gear; the rotating disk is rotationally connected to the transmission gear; wherein, when the roller rotates, it drives the first gear, the transmission gear and the rotating disk to rotate in sequence.

[0005] In one embodiment, the roller comprises:

[0006] A first end portion and a second end portion are arranged opposite to each other, and a contact portion is arranged between the first end portion and the second end portion, wherein the contact portion is in contact with and connected to the handrail track; the first end portion and the second end portion are respectively arranged on opposite sides of the handrail track in the width direction to limit the connection position of the contact portion and the handrail track; wherein the dimensions of the first end portion and the second end portion are both larger than the dimensions of the contact portion.

[0007] In one embodiment, the first gear and the roller are spaced apart and connected to each other via a bearing.

[0008] In one embodiment, the transmission gear comprises:

[0009] a first sub-gear, meshing with the first gear;

[0010] The second sub-gear is coaxially arranged with the first sub-gear and fixedly connected, and the second sub-gear rotates synchronously with the first sub-gear; wherein the size of the second sub-gear is larger than that of the first gear.

[0011] In one embodiment, the gear self-speed limiting system further comprises:

[0012] The second gear is arranged between the first gear and the first sub-gear and is arranged parallel to the first gear and the first sub-gear; the second gear is configured to rotate with the rotation of the first gear and drive the first sub-gear to rotate.

[0013] In one embodiment, the gear self-speed limiting system further comprises: a mounting plate arranged along a first direction; wherein the first direction is the installation direction of the emergency escape device; the mounting plate has:

[0014] a first mounting hole, wherein the roller and the first gear are mounted on opposite sides of the first mounting hole along a second direction via a first rotating shaft; wherein the second direction is arranged to intersect with the first direction;

[0015] a first mounting slot, wherein the second gear is mounted on one side of the mounting plate through the first mounting slot;

[0016] a second mounting slot, wherein the transmission gear is mounted on one side of the mounting plate through the second mounting slot; the second gear and the transmission gear are mounted on the same side of the mounting plate;

[0017] a second mounting hole, wherein the second sub-gear and the first sub-gear are mounted on opposite sides of the second mounting hole along the second direction;

[0018] Wherein, the first mounting hole, the first mounting groove, the second mounting groove and the second mounting hole are sequentially arranged along the first direction.

[0019] In one embodiment, the rotating disk comprises:

[0020] a first rotating wheel meshing with the second sub-gear;

[0021] The second rotating wheel is coaxially arranged and fixedly connected to the first rotating wheel, and the second rotating wheel rotates synchronously with the first rotating wheel; wherein the size of the second rotating wheel is larger than that of the first rotating wheel.

[0022] In one embodiment, the second rotating wheel comprises:

[0023] The limiting gear comprises a plurality of limiting teeth, with limiting grooves formed between adjacent limiting teeth;

[0024] A first impact column is disposed in the limiting groove;

[0025] A plurality of second impact columns are arranged around the periphery of the limiting teeth and are configured to limit the first impact columns.

[0026] In one embodiment, the side of the rotating disk away from the mounting plate further comprises:

[0027] The cover body includes a main body and an extension portion extending along the main body toward one side of the limiting gear, wherein the extension portion covers side surfaces of the plurality of second impact columns.

[0028] In order to solve the above technical problems, the second technical solution provided by this application is to provide an emergency escape system, comprising:

[0029] An emergency escape device, comprising a gear self-limiting system, wherein the gear self-limiting system is any one of the gear self-limiting systems described above;

[0030] The handrail track is matched and connected with the roller of the gear self-speed limiting system.

[0031] Beneficial effects of the present application: Different from the prior art, the gear self-speed limiting system of the present application is connected to the handrail track for emergency escape. The gear self-speed limiting system may include: a roller, a first gear, a transmission gear and a rotating disk, and the roller is matched and connected to the handrail track. The first gear is coaxially arranged with the roller, and the first gear and the roller are spaced apart by a bearing, and are connected to each other by a spline, and the first gear rotates with the rotation of the roller. The transmission gear is rotationally connected to the first gear, specifically by meshing with their respective gears. The rotating disk is rotationally connected to the transmission gear, specifically by meshing with their respective gears. When the roller rotates, it drives the first gear, the transmission gear and the rotating disk to rotate in turn. By cooperating with multiple gears and rollers of the gear self-speed limiting system, the speed of the roller during the operation of the connection between the roller and the handrail track can be effectively controlled, thereby improving the safety and stability of the operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technical workers in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of the emergency escape system provided by this application;

[0034] Figure 2 It is a schematic diagram of the cross-sectional structure of the handrail track provided in this application;

[0035] Figure 3This is a schematic structural diagram from one perspective of the gear self-speed limiting system provided by the present application;

[0036] Figure 4 This is a structural diagram of the gear self-speed limiting system provided by the present application from another perspective;

[0037] Figure 5 It is a structural diagram of the mounting plate provided in this application;

[0038] Figure 6 This is a structural schematic diagram of the gear self-speed limiting system provided by the present application from another perspective, which illustrates the specific structure of the first rotating wheel.

[0039] Description of reference numerals:

[0040] 100. Emergency escape system 1. Handrail; 2. Emergency escape device; 10. First main body; 101. First bending portion; 102. First protrusion; 1021. First groove; 1022. Second groove; 103. Third bending portion; 104. Second protrusion; 1041. Third groove; 105. Second bending portion; 106. Groove structure; 11. Second main body; 12. Third main body; 121. Top wall; 13. Concave cavity; 3. Gear self-speed limiting system; 30. Roller; 301. First end portion; 302. Second end portion; 303. Contact portion; 31. A gear; 312, a bearing; 313, a first rotating shaft; 32, a second gear; 33, a transmission gear; 331, a first sub-gear; 332, a second sub-gear; 34, a rotating disk; 341, a first rotating wheel; 3411, a limiting tooth; 3412, a limiting groove; 3413, a first impact column; 3414, a second impact column; 342, a second rotating wheel; 35, a mounting plate; 351, a first mounting hole; 352, a first mounting groove; 353, a second mounting groove; 354, a second mounting hole; 355, an assembly hole; 36, a cover; 361, a main body; 362, an extension. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] The terms "first" and "second" in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of the various components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0043] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.

[0044] This application provides an emergency escape system and a gear self-limiting speed system for the emergency escape device. Using a parallel shaft drive coupled with centrifugal intermittent impact speed control technology, and employing purely mechanical transmission, the emergency escape device can achieve a uniform descent speed of 0.8m / s to 1.2m / s on handrail surfaces with a slope of 28° to 35°, unaffected by dust, water, and oil stains (no electric drive required, suitable for various emergency situations).

[0045] This device can be used in emergency situations such as fire. By sliding down the modified and installed handrail track at a constant speed, it can be completed in about 3 minutes from the 30th floor to the 1st floor. For example, it only takes 180 seconds to slide from the 32nd floor to the 1st floor, thus ensuring both the time requirement for emergency escape and the safety of the escaping objects.

[0046] See also Figures 1 to 2 , Figure 1 It is a schematic diagram of the overall structure of the emergency escape system provided by this application; Figure 2 It is a schematic diagram of the cross-sectional structure of the handrail track provided in this application.

[0047] An emergency escape system 100 provided in one embodiment of the present application may include an emergency escape device 2 and a handrail track 1. The emergency escape device 2 includes a gear self-speed limiting system 3, which is any one of the following gear self-speed limiting systems 3; the handrail track 1 is matched and connected with the roller 30 of the gear self-speed limiting system 3.

[0048] The handrail track 1 may include a first main body portion 10, a second main body portion 11 and a third main body portion 12, wherein the first main body portion 10, the second main body portion 11 and the third main body portion 12 cooperate to form a semi-enclosed concave cavity 13;

[0049] A first bend 101 is defined between the first and second body portions 10, 11, and a second bend 105 is defined between the second and third body portions 11, 12. The first bend 101 also has a third bend 103 on its end away from the second body portion 11. A groove 106 is formed on the inner sidewall of the third bend 103 between the second and third body portions 11, and the emergency escape device 2 is coupled to the groove 106. The inner sidewall of the first body portion 10 has a first protrusion 102 extending into the cavity 13. Opposite sidewalls of the first protrusion 102 and the sidewalls of the first body portion 10 form opposing first and second grooves 1021, 1022. A second protrusion 104 is also defined between the first and second body portions 10, 11, spaced apart from the first protrusion 102. The width of the second protrusion 104 is smaller than that of the first protrusion 102. A third groove 1041 is formed between the second protrusion 104 and the inner sidewall of the first bent portion 101 .

[0050] See also Figures 3 to 6 , Figure 3 This is a schematic structural diagram from one perspective of the gear self-speed limiting system provided by the present application; Figure 4 This is a structural diagram of the gear self-speed limiting system provided by the present application from another perspective; Figure 5 It is a structural diagram of the mounting plate provided in this application; Figure 6 This is a structural schematic diagram of the gear self-speed limiting system provided by the present application from another perspective, which illustrates the specific structure of the first rotating wheel.

[0051] The gear self-speed limiting system 3 provided in one embodiment of the present application is connected to the handrail track 1 for emergency escape. The gear self-speed limiting system 3 may include: a roller 30, a first gear 31, a transmission gear 33 and a rotating disk 34, and the roller 30 is matched and connected to the handrail track 1.

[0052] In one embodiment, the first gear 31 is coaxially disposed with the roller 30, spaced apart by a bearing 312 and connected to each other via a spline. The first gear 31 rotates with the rotation of the roller 30. The transmission gear 33 is rotationally coupled to the first gear 31, specifically by meshing with their respective gears. The rotating disk 34 is rotationally coupled to the transmission gear 33, specifically by meshing with their respective gears. When the roller 30 rotates, it sequentially drives the first gear 31, the transmission gear 33, and the rotating disk 34 to rotate.

[0053] like Figure 3 and Figure 4 As shown, in one embodiment, the roller 30 includes a first end 301 and a second end 302 disposed opposite each other, and a contact portion 303 disposed between the first end 301 and the second end 302. The contact portion 303 is in contact with the handrail track 1. The first end 301 and the second end 302 are disposed on opposite sides of the handrail track 1 in the width direction to limit the connection position of the contact portion 303 with the handrail track 1.

[0054] Specifically, the contact portion 303 contacts the top wall 121 of the handrail track 1, and the first end portion 301 and the second end portion 302 are respectively engaged at opposite ends of the top surface to limit the roller 30 in the second direction (the width direction of the handrail track 1), preventing the roller 30 from falling off the handrail track 1. Furthermore, in this embodiment, the contact surface between the contact portion 303 and the top wall 121 of the handrail track 1 is coated with a rubber or polymeric material (e.g., polyurethane) having a high coefficient of friction and being durable and wear-resistant, thereby increasing the friction of this contact surface and improving durability. It will be understood that in order for the first end portion 301 and the second end portion 302 to limit the contact portion 303, the dimensions of the first end portion 301 and the second end portion 302 should be larger than those of the contact portion 303. The specific dimensions can be set as needed and are not limited in this application.

[0055] In one embodiment, the transmission gear 33 includes a first sub-gear 331 and a second sub-gear 332. The first sub-gear 331 meshes with the first gear 31. The second sub-gear 332 is coaxially arranged and fixedly connected to the first sub-gear 331, so that the second sub-gear 332 rotates synchronously with the first sub-gear 331. The second sub-gear 332 is larger than the first gear 31, so that the first sub-gear 331 and the second sub-gear 332 form a stepped gear set. The process of the first gear 31 driving the transmission gear 33 to rotate forms a first gear speed increase.

[0056] In one embodiment, the gear self-speed limiting system 3 may further include: a second gear 32, which is arranged between the first gear 31 and the first sub-gear 331, and is arranged parallel to the first gear 31 and the first sub-gear 331 along the first direction. The second gear 32 is configured to rotate with the rotation of the first gear 31 and drive the first sub-gear 331 to rotate. In other words, the first gear 31 drives the second gear 32 to rotate, and the second gear 32 then drives the first sub-gear 331 to rotate. In the process of the second gear 32 driving the first sub-gear 331 to rotate, a second gear speed increase is formed, so that the speed gradually increases during the rotation from the roller 30 to the first sub-gear 331.

[0057] In one embodiment, if Figures 3 to 6 As shown, the gear self-speed limiting system 3 may further include: a mounting plate 35 arranged along a first direction; wherein the first direction is the installation direction of the emergency escape device 2; the mounting plate 35 is provided with: a first mounting hole 351, a first mounting slot 352, a second mounting slot 353, and a second mounting hole 354, wherein the first mounting hole 351, the first mounting slot 352, the second mounting slot 353, and the second mounting hole 354 are arranged in sequence along the first direction. The roller 30 and the first gear 31 are mounted on opposite sides of the first mounting hole 351 via the first rotating shaft 313 along a second direction; wherein the second direction is arranged intersectingly with the first direction, preferably perpendicularly. The second gear 32 is mounted on one side of the mounting plate 35 via the first mounting slot 352; the transmission gear 33 is mounted on one side of the mounting plate 35 via the second mounting slot 353; the second gear 32 and the transmission gear 33 are mounted on the same side of the mounting plate 35; and the second sub-gear 332 and the first sub-gear 331 are mounted on opposite sides of the second mounting hole 354 along the second direction. That is, the first mounting hole 351 and the second mounting hole 354 are through holes; the first mounting groove 352 and the second mounting groove 353 are blind holes that do not penetrate the mounting plate 35 .

[0058] In addition, a plurality of assembly holes 355 can be provided on the mounting plate 35. The assembly holes 355 can be used to fix the above-mentioned roller 30, the first gear 31, the second gear 32, the transmission gear 33 and the rotating disk 34, etc., and can also be used to fix the fixing plate to the outer shell. The specific assembly and use can be carried out according to needs, and this application does not impose any restrictions on this.

[0059] In one embodiment, the rotating disk 34 includes a first rotating wheel 341 and a second rotating wheel 342. The first rotating wheel 341 is meshed with the second sub-gear 332. The second rotating wheel 342 is coaxially arranged with the first rotating wheel 341 and is fixedly connected through the second mounting slot 353. The second rotating wheel 342 rotates synchronously with the first rotating wheel 341. Preferably, the second rotating wheel 342 and the first rotating wheel 341 are fixed to opposite sides of the mounting plate 35 via the same rotating shaft. The second rotating wheel 342 is larger than the first rotating wheel 341.

[0060] In one embodiment, the second rotating wheel 342 includes a limiting gear 3410, a first impact post 3413, and a plurality of second impact posts 3414. The limiting gear 3410 includes a plurality of limiting teeth 3411, with a plurality of limiting slots 3412 formed between adjacent limiting teeth 3411. The first impact posts 3413 are disposed within the limiting slots 3412, that is, each limiting slot 3412 is provided with a first impact post 3413. The plurality of second impact posts 3414 are disposed around the limiting teeth 3411 and are configured to limit the first impact posts 3413. The movable teeth of the first rotating wheel 341 drive the second rotating wheel 342 to rapidly rotate, generating a strong centrifugal force. This force causes the first impact pins 3413 within the limiting slots 3412 to be thrown out of the limiting slots 3412, causing them to intermittently impact and rotate with the second impact pins 3414 disposed around the limiting teeth 3411. At the moment of impact, the first impact pins 3413 are driven back into the limiting slots 3412, generating friction and impact damping, further limiting the rotational speed of the movable teeth of the first rotating wheel 341, thereby reducing the speed. This reduction in speed is sequentially transmitted through the first rotating wheel 341, the transmission gear 33, the second gear 32, and the first gear 31, and further reacts to the roller 30, causing it to slow down and roll at a constant speed. In other embodiments, the plurality of second impact pins 3414 can also be an annular buffer pin (not shown) surrounding the plurality of limiting teeth 3411.

[0061] Through the above-mentioned gear speed increase and friction and impact deceleration process, the speed of the roller 30 can be controlled within a certain range, so that the roller 30 can accelerate while sliding along the handrail track 1, but the speed will not be too fast. When a certain speed is reached, the speed of the roller 30 is controlled by the reaction force generated by the impact damping of the first impact column 3413 and the second impact column 3414, thereby ensuring the stable and safe operation of the roller 30 and improving the safety of the emergency escape device 2.

[0062] In one embodiment, the rotating disk 34 further includes a cover 36, which is disposed on a side of the rotating disk 34 away from the mounting plate 35. The cover 36 includes a main body 361 disposed on the side away from the rotating disk 34 and an extension 362 extending from the main body 361 toward the cover. The extension 362 covers the sides of the plurality of second impact pins 3414, thereby protecting the plurality of second impact pins 3414 from being dislodged, thereby ensuring safe operation of the device.

[0063] When using the escape device, the user properly wears the accompanying escape seat (not shown), hooks the escape seat's strap (the strap must not be twisted or knotted) to the emergency escape device 2, and securely connects the handrail 1 to the emergency escape device 2. Pulling the brake lever (not shown), and securely sitting in the escape seat, the user descends at a steady speed on the handrail 1, enabling rapid evacuation. In the event of an emergency, the user can manually pull the brake lever to instantly stop the vehicle. This simple, convenient, safe, and timely process ensures effective emergency rescue.

[0064] The gear self-speed limiting system 3 disclosed in this application is connected to the emergency escape handrail 1. The gear self-speed limiting system 3 may include: a roller 30, a first gear 31, a transmission gear 33, and a rotating disk 34. The roller 30 is matingly connected to the handrail 1. The first gear 31 is coaxially arranged with the roller 30, spaced apart by a bearing 312 and connected to each other via a spline. The first gear 31 rotates with the rotation of the roller 30. The transmission gear 33 is rotationally connected to the first gear 31, specifically by meshing with their respective gears. The rotating disk 34 is rotationally connected to the transmission gear 33, specifically by meshing with their respective gears. When the roller 30 rotates, it sequentially drives the first gear 31, the transmission gear 33, and the rotating disk 34 to rotate. The coordination of the multiple gears of the gear self-speed limiting system 3 and the roller 30 allows the speed of the roller 30 to be effectively controlled during operation in conjunction with the handrail 1, thereby improving the safety and stability of the device.

[0065] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A gear self-speed limiting system, used for emergency escape device, connected to an emergency escape handrail track; characterized in that: include: Rollers, matched and connected with the handrail track; a first gear, coaxially arranged with the roller and rotating with the rotation of the roller; a transmission gear, rotatably connected to the first gear; a rotating disk, rotatably connected to the transmission gear; When the roller rotates, it drives the first gear, the transmission gear and the rotating disk to rotate in sequence.

2. The gear self-speed limiting system according to claim 1, characterized in that: The roller comprises: A first end portion and a second end portion are arranged opposite to each other, and a contact portion is arranged between the first end portion and the second end portion, wherein the contact portion is in contact with and connected to the handrail track; the first end portion and the second end portion are respectively arranged on opposite sides of the handrail track in the width direction to limit the connection position of the contact portion and the handrail track; wherein the dimensions of the first end portion and the second end portion are both larger than the dimensions of the contact portion.

3. The gear self-speed limiting system according to claim 1, characterized in that: The first gear and the roller are spaced apart by a bearing and are connected to each other.

4. The gear self-speed limiting system according to claim 1, characterized in that: The transmission gear comprises: a first sub-gear, meshing with the first gear; The second sub-gear is coaxially arranged with the first sub-gear and fixedly connected, and the second sub-gear rotates synchronously with the first sub-gear; wherein the size of the second sub-gear is larger than that of the first gear.

5. The gear self-speed limiting system according to claim 4, characterized in that: Also includes: The second gear is arranged between the first gear and the first sub-gear and is arranged parallel to the first gear and the first sub-gear; the second gear is configured to rotate with the rotation of the first gear and drive the first sub-gear to rotate.

6. The gear self-speed limiting system according to claim 5, characterized in that: Also includes: A mounting plate arranged along a first direction; wherein the first direction is the mounting direction of the emergency escape device; the mounting plate has: a first mounting hole, wherein the roller and the first gear are mounted on opposite sides of the first mounting hole along a second direction via a first rotating shaft; wherein the second direction is arranged to intersect with the first direction; a first mounting slot, wherein the second gear is mounted on one side of the mounting plate through the first mounting slot; a second mounting slot, wherein the transmission gear is mounted on one side of the mounting plate through the second mounting slot; the second gear and the transmission gear are mounted on the same side of the mounting plate; a second mounting hole, wherein the second sub-gear and the first sub-gear are mounted on opposite sides of the second mounting hole along the second direction; Wherein, the first mounting hole, the first mounting groove, the second mounting groove and the second mounting hole are sequentially arranged along the first direction.

7. The gear self-speed limiting system according to claim 4, characterized in that: The rotating disk comprises: a first rotating wheel meshing with the second sub-gear; The second rotating wheel is coaxially arranged and fixedly connected to the first rotating wheel, and the second rotating wheel rotates synchronously with the first rotating wheel; wherein the size of the second rotating wheel is larger than that of the first rotating wheel.

8. The gear self-speed limiting system according to claim 7, characterized in that: The second rotating wheel comprises: The limiting gear comprises a plurality of limiting teeth, with limiting grooves formed between adjacent limiting teeth; A first impact column is disposed in the limiting groove; A plurality of second impact columns are arranged around the periphery of the limiting teeth and are configured to limit the first impact columns.

9. The gear self-speed limiting system according to claim 8, characterized in that: The side of the rotating disk away from the mounting plate also has: The cover body includes a main body and an extension portion extending along the main body toward one side of the limiting gear, wherein the extension portion covers side surfaces of the plurality of second impact columns.

10. An emergency escape system, characterized in that: include: An emergency escape device, comprising a gear self-limiting system, wherein the gear self-limiting system is the gear self-limiting system according to any one of claims 1 to 9; The handrail track is matched and connected with the roller of the gear self-speed limiting system.

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