Double speed limiting high-rise escape device

Abstract

The present invention discloses a dual speed-limiting high-rise escape device, comprising a mounting seat, a first speed-limiting escape mechanism, a second speed-limiting escape mechanism and a transmission structure; wherein the first speed-limiting escape mechanism comprises a driving shaft mounted on the mounting seat, and a rope winding wheel structure and a damping speed-limiting mechanism respectively arranged at both ends of the driving shaft; the second speed-limiting escape mechanism comprises a driven shaft mounted on the mounting seat, and a friction speed-limiting mechanism arranged on the driven shaft; and the transmission structure connects the driven shaft with the driving shaft. The dual speed-limiting high-rise escape device provided by this technical solution aims to solve the problems that the traditional escape device needs a power structure to start, which is inconvenient to use; and the lack of a speed-limiting structure makes it difficult for the user to control the escape speed, which brings serious safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of escape devices, in particular to a double speed-limiting high-rise escape device. Background Art

[0002] At present, the possibility of accidental fires or accidents in high-rise buildings is increasing, and there is an urgent need to realize the scientific and standardized configuration of building accident escape and refuge equipment to reduce casualties and save lives. However, most of the existing escape devices require power devices, which are inconvenient to operate for special groups such as children or the elderly, and easily delay the best escape time. In addition, most of the existing escape devices lack a speed limiting function and cannot control the escape speed, which will bring great safety hazards to the escape of personnel. Although a few escape devices have a speed limiting function, the speed limiting function is not good, and the speed range is very restrictive. Therefore, providing an escape device with a good speed limiting function that does not require a power device to drive has become a problem that technicians in this field urgently need to solve. Summary of the invention

[0003] Based on this, the present invention provides a dual speed-limiting high-rise escape device, which aims to solve the problems in traditional technologies that traditional escape devices require a power structure to start, which is inconvenient to use; and lack a speed-limiting structure, making it difficult for users to control their escape speed, posing serious safety hazards.

[0004] To achieve the above object, the present invention proposes the following technical solutions:

[0005] A double speed-limiting high-rise escape device, comprising:

[0006] Mounting seat;

[0007] The first speed-limiting escape mechanism comprises a driving shaft mounted on the mounting seat, and a rope-winding wheel structure and a damping speed-limiting mechanism respectively arranged at two ends of the driving shaft;

[0008] A second speed limiting escape mechanism comprises a driven shaft mounted on the mounting seat, and a friction speed limiting mechanism disposed on the driven shaft; and,

[0009] A transmission structure connects the driven rotating shaft and the driving rotating shaft.

[0010] Optionally, the friction speed limiting mechanism includes a friction disc structure provided on the driven rotating shaft, and at least one rocker structure hingedly connecting the friction disc structure and the driven rotating shaft.

[0011] Optionally, the rocker rod structure includes a first rocker rod hinged to the friction disc structure, and a second push rod hinged to the driven shaft, and the first rocker rod is hinged to the second push rod.

[0012] Optionally, the swing rod structure further includes a centrifugal ball disposed at the end of the second push rod, and the first swing rod is hinged to the centrifugal ball.

[0013] Optionally, the friction disc structure includes a friction plate arranged on the driven rotating shaft, a friction pressure plate movably sleeved on the driven rotating shaft and correspondingly cooperating with the friction plate, and an elastic member arranged on the driven rotating shaft and located between the friction plate and the friction pressure plate, and the first rocker arm is hinged to the friction pressure plate.

[0014] Optionally, the friction disc structure includes a fixing seat for fixing on a wall, the friction plate is fixed on the fixing seat, and the driven shaft rotates through the friction plate and the fixing seat.

[0015] Optionally, the transmission structure is configured as a gear transmission structure, and the gear transmission structure and the friction speed limiting mechanism are respectively located at two ends of the driven shaft.

[0016] Optionally, the gear transmission structure includes a driving gear coaxially arranged on the driving rotating shaft, and a driven gear coaxially arranged on the driven rotating shaft, and the driven gear is meshed with the driving gear.

[0017] Optionally, the damping speed limiting mechanism includes a speed increasing structure provided at one end of the driving shaft, and a magnetic damping structure provided at an end of the speed increasing structure.

[0018] Optionally, the mounting seat comprises a first support seat and a second support seat which are spaced apart, a first support bearing provided on the first support seat, and a second support bearing provided on the second support seat, and both ends of the driving shaft are respectively passed through the first support bearing and the second support bearing;

[0019] The mounting seat also includes a third support seat and a fourth support seat arranged at intervals, a third support bearing arranged on the third support seat, and a fourth support bearing arranged on the fourth support seat, the two ends of the driven shaft are respectively passed through the third support bearing and the fourth support bearing, and the driven shaft and the driving shaft are arranged side by side.

[0020] Traditional escape devices require a power structure to start, which is inconvenient to use; and the lack of a speed limiting structure makes it difficult for users to control their escape speed, which brings serious safety hazards. In this technical solution, a rope winding wheel structure is used to wind the escape rope, the driving shaft rotates under the drive of the rope winding wheel structure, and the damping speed limiting mechanism is used to limit and adjust the speed of the driving shaft; through the transmission action of the transmission structure, the movement of the driving shaft is transmitted to the driven shaft, and the friction speed limiting mechanism provided on the driven shaft limits and adjusts the speed of the driven shaft, thereby reacting to the driving shaft, and the speed of the driving shaft is adjusted in both directions through the damping speed limiting mechanism and the friction speed limiting mechanism, thereby adjusting the descending speed of the rope on the rope winding wheel structure, thereby achieving the effect of controlling the escape speed of personnel; the dual speed limiting high-rise escape device provided by this technical solution does not require a power structure, and can be started by relying on the power of the personnel themselves, which is convenient and fast; and the device controls the escape speed of personnel in both directions by setting a first speed limiting escape mechanism and a second speed limiting escape mechanism at the same time, thereby improving the safety and stability of personnel escape. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the double speed-limiting high-rise escape device according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the partial structure of the double speed-limiting high-rise escape device according to an embodiment of the present invention;

[0024] Figure 3 A schematic structural diagram of a second speed limiting escape mechanism of a double speed limiting high-rise escape device according to an embodiment of the present invention;

[0025] Figure 4 The figure is a schematic diagram showing the parameter relationship and force of the friction speed limiting mechanism of the double speed limiting high-rise escape device according to an embodiment of the present invention.

[0026] Description of Figure Numbers:

[0027]

[0028]

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] At present, the possibility of accidental fire or accidents in high-rise buildings is increasing, and there is an urgent need to realize the scientific and standardized configuration of building accident escape and refuge equipment to reduce casualties and save lives. The high-rise escape device in traditional technology requires a power structure to start, which is not easy to operate for special groups such as the elderly or children, and there may be safety hazards. Therefore, it is necessary to provide a purely mechanical autonomous escape device that can start the escape by relying on the person's own gravity; in addition, the escape device in the existing technology lacks a qualified and accurate speed limit structure, which has huge safety hazards, and the escape device with stable and safe escape performance should have a good speed limit function, so that different users can safely avoid danger at the optimal escape speed of about 1.2m / s.

[0034] In view of this, the present invention provides a double speed-limiting high-rise escape device. Figure 1 This is a schematic diagram of the three-dimensional structure of the double speed-limiting high-rise escape device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the partial structure of the double speed-limiting high-rise escape device according to an embodiment of the present invention; Figure 3 A schematic structural diagram of a second speed limiting escape mechanism of a double speed limiting high-rise escape device according to an embodiment of the present invention; Figure 4 The figure is a schematic diagram showing the parameter relationship and force of the friction speed limiting mechanism of the double speed limiting high-rise escape device according to an embodiment of the present invention.

[0035] See also Figure 1 In this embodiment, the dual speed-limiting high-rise escape device 1000 includes a mounting seat 100 , a first speed-limiting escape mechanism 200 , a second speed-limiting escape mechanism 300 and a transmission structure 400 . Among them, the first speed limiting escape mechanism 200 includes a driving shaft 210 installed on the mounting seat 100, and a rope winding wheel structure 220 and a damping speed limiting mechanism 230 respectively arranged at both ends of the driving shaft 210, the rope winding wheel structure 220 is used to wind the escape rope, and the damping speed limiting mechanism 230 is used to limit and adjust the rotation speed of the driving shaft 210, so as to achieve the effect of adjusting the rope descent speed on the rope winding wheel structure 220; the second speed limiting escape mechanism 300 includes a driven shaft 310 installed on the mounting seat 100, and a friction speed limiting mechanism 320 arranged on the driven shaft 310. It should be noted that the driven shaft 310 is connected to the driving shaft 210 through the transmission structure 400, and the friction speed limiting mechanism 320 is used to limit and adjust the rotation speed of the driven shaft 310, thereby reacting to the driving shaft 210, so as to achieve the effect of bidirectional control of the rope descent speed on the rope winding wheel structure 220.

[0036] The dual speed-limiting high-rise escape device 1000 provided by the present invention uses the user's own gravity to start and stop. It should be noted that in order to achieve a good control effect, the damping speed-limiting mechanism 230 should be a constant damping speed-limiting mechanism, and the corresponding friction speed-limiting mechanism 320 is a variable damping speed-limiting mechanism. Considering the gravity of the escape rope, in this embodiment, when the design load torque is required to reach 1.1 times of the damping speed-limiting mechanism 230, the friction speed-limiting mechanism 320 begins to generate a damping torque, thereby achieving the effect of bidirectionally controlling the escape speed of personnel. The device is mainly controlled on the three main motion parameters of the user, namely, displacement, speed and acceleration, wherein the displacement is limited by the rope length. When the effective working rope length is reached, the rope wheel structure 220 cannot generate torque due to the loss of the force arm, and thus the user cannot continue to descend. The escape speed is limited by the first speed limiting escape mechanism 200 and the second speed limiting escape mechanism 300 of the escape device. As mentioned above, in this embodiment, when the design load torque is required to reach 1.1 times of the damping speed limiting mechanism 230 (it should be noted that the load The torque requirement can be set according to the actual situation), the friction speed limit mechanism 320 starts to generate damping torque. When the torque generated by the user is lower than 1.1 times the damping force of the damping speed limit mechanism 230, the damping speed limit mechanism 230 is relied on to maintain a stable descent speed. When the torque generated by the user is greater than 1.1 times the damping force of the damping speed limit mechanism 230, in addition to the constant damping speed limit mechanism 230 speed limit, a non-constant friction speed limit mechanism 320 is added (the friction damping will be adjusted in a certain proportion with the excess constant damping torque limit part) to limit the descent speed. In addition, the minimum starting torque should be set to 0.5 times the maximum magnetic damping torque of the damping speed limit mechanism 230 to prevent users from starting by mistake. From the above analysis, it can be seen that the escape device can fully guarantee a relatively stable descent speed for all kinds of situations. The acceleration changes continuously with the torque effect generated by the user. Because constant damping and friction damping are generated successively, the early stage is an accelerated motion with reduced acceleration until friction damping is generated, and the motion state in which the acceleration is reduced to zero will be presented, thereby finally achieving uniform motion, ensuring that the user's downward speed is always controlled at ≤1.2m / s, thereby improving the safety and stability of escape.

[0037] See also Figure 2 as well as Figure 3 Specifically, the friction speed limiting mechanism 320 includes a friction disc structure 321 disposed on the driven rotating shaft 310, and at least one swing rod structure 322 articulating the friction disc structure 321 and the driven rotating shaft 310. In this embodiment, in order to ensure uniform force, the swing rod structure 322 is configured as three swing rod structures 322 uniformly disposed around the driven rotating shaft 310, see Figure 2The rocker arm structure 322 includes a first rocker arm 327 hinged to the friction disc structure 321, and a second push rod 328 hinged to the driven shaft 310, and the first rocker arm 327 is hinged to the second push rod 328, and a centrifugal ball 329 is provided at the end of the second push rod 328, and the first rocker arm 327 is hinged to the centrifugal ball 329; the friction disc structure 321 includes a friction plate 324 arranged on the driven shaft 310, a friction pressure plate 325 movably sleeved on the driven shaft 310 and corresponding to the friction plate 324, and an elastic member 326 arranged on the driven shaft 310 and located between the friction plate 324 and the friction pressure plate 325, the first rocker arm 327 is hinged to the friction pressure plate 325, and in this embodiment, the elastic member 326 is set as a spring. The friction speed limiting mechanism 320 has the following working route: collecting the angular velocity of the rope wheel structure 220 → driving shaft 210 → driven shaft 310 → second push rod 328 → centrifugal ball 329 → first swing rod 327 → friction pressure plate 325 → friction plate 324; the specific working principle of the friction speed limiting mechanism 320 is: the centrifugal ball 329 will make a centrifugal outward swing around the second push rod 328 because it rotates synchronously with the driven shaft 310, so that the second push rod 328 increases its opening angle, and is connected to the centrifugal ball 329 accordingly. The first swing rod 327 will overcome the spring force, and then push the friction plate 325 to move along the driven shaft 310 toward the friction plate 324. In this process, the free gap will be slowly eliminated. When the set value is reached, the friction plate 325 and the friction plate 324 are in a strong fit state, generating a reverse resistance torque to be fed back to the rope winding wheel structure 220. As the speed increases, this resistance torque will continue to increase, and eventually the damping torque generated by the friction damping and magnetic damping will be balanced with the user's gravity torque, so that the user can descend at a steady speed. In addition, in order to ensure the stability of the device, the friction plate structure 321 includes a fixing seat 323 for fixing on the wall, the friction plate 324 is fixed on the fixing seat 323, and the driven shaft 310 rotates through the friction plate 324 and the fixing seat 323.

[0038] See also Figure 1 In this embodiment, the transmission structure 400 is set as a gear transmission structure 410, and the gear transmission structure 410 and the friction speed limiting mechanism 320 are respectively located at both ends of the driven shaft 310; as shown in the figure, the gear transmission structure 410 includes a driving gear 411 coaxially arranged on the driving shaft 210, and a driven gear 412 coaxially arranged on the driven shaft 310, and the driven gear 412 is meshed with the driving gear 411. The rotation of the driving shaft 210 drives the rotation of the driving gear 411, thereby driving the rotation of the driven gear 412, and then driving the rotation of the driven shaft 310, achieving a good transmission effect. It should be noted that gear transmission is not the only implementation method, and it can also be specifically a pulley transmission, etc., which is not limited in this embodiment.

[0039] As mentioned above, in order to achieve a good control effect, the damping speed limiting mechanism 230 should be a constant damping speed limiting mechanism, and the corresponding friction speed limiting mechanism 320 is a variable damping speed limiting mechanism. In this embodiment, the damping speed limiting mechanism 230 includes a speed increasing structure 231 disposed at one end of the driving shaft 210, and a magnetic damping structure 232 disposed at the end of the speed increasing structure 231. In view of the existing constant damping speed limiting structure, such as a magnetic damper that does not have high requirements on the external environment, it can be seen that the performance of the current damper cannot directly meet the use of the high-rise speed limiting escape device. According to the law of conservation of energy, it can be seen that the change in the gravitational potential energy of the user is the amount of work done by the damping torque, so the reduction of the resistance torque and the increase of the rotation speed required by the damping speed limiting mechanism 230 can be achieved through the speed increasing structure 231. Therefore, in the present invention, the damping speed limiting mechanism 230 includes a speed increasing structure 231 arranged at one end of the driving shaft 210, and a magnetic damping structure 232 arranged at the end of the speed increasing structure 231. The torque-speed adjustment is performed through the speed increasing structure 231, and the damping speed limiting adjustment is performed through the magnetic damping structure 232, so as to achieve a good use effect.

[0040] Furthermore, the speed increasing structure 231 includes a planetary speed increaser disposed at the end of the driving shaft 210, and the planetary speed increaser includes a planetary wheel carrier connected to the end of the driving shaft 210, a plurality of planetary wheels disposed on the planetary wheel carrier, a sun wheel simultaneously meshing with the plurality of planetary wheels and connected to the magnetic damping structure 232, and an outer gear ring meshing with the sun wheel, and the outer gear ring is connected to the mounting seat 100. Since the planetary speed increaser is a prior art, the present invention will not elaborate on it. It can be seen from the above content that the planetary speed increaser is mainly used for adjusting the torque and speed, so the planetary speed increaser is not the only implementation method, and other specific speed increasers that can adjust the torque and speed can also achieve the implementation effect, and the present invention does not limit it.

[0041] As mentioned above, in the existing damping structure, the magnetic damper has low requirements on the external environment and is easy to use. Therefore, in the present technical solution, the magnetic damping structure 232 includes a magnetic damper connected to the axle of the sun gear of the planetary speed increaser. According to the magnetic damping speed limit principle, when designing a high-rise speed limit escape device, it is necessary to select and adjust the magnetic damper product according to the set value to achieve the efficiency and reliability of the entire device. The magnetic damper can be purchased and installed directly according to demand. According to the calculation based on the mass of an adult of 70kg, the MTB-06 series magnetic damper basically meets the requirements. In addition, it should be noted that during the setting process, the minimum starting torque should also be set to 0.5 times the maximum magnetic damping torque of the magnetic damper to prevent users from starting by mistake.

[0042] See also Figure 4 , using the moment balance principle, the force analysis of the driven shaft 310 can be obtained:

[0043]

[0044] M 摩 —Friction torque (N·m); D—diameter of the rope sheave structure (m);

[0045] G-user weight (N); Z 驱 —Number of teeth on the driving gear; Z 从 —Number of teeth on the driven gear;

[0046] That is, when the friction torque generated is expressed as formula (1), the user's descending state is uniform motion.

[0047] When the escapee descends at a safe speed V (in m / s), the rotation speed of the rope sheave structure 220 is:

[0048]

[0049] According to the gear transmission relationship, the speed of the driven gear 412 is:

[0050]

[0051] The relationship between the parameters and the force of the friction damping mechanism 232 is as follows: Figure 4 As shown, when the centrifugal ball 329 is n 球 When the first swing rod 327 rotates at a speed of:

[0052]

[0053] According to the principle of torque balance, referring to the force condition of the friction disc, we can get:

[0054]

[0055] The friction force is:

[0056]

[0057] Therefore, the friction resistance torque is:

[0058]

[0059] Combining formulas (1) and (2), we can get:

[0060]

[0061] After final arrangement, we can get:

[0062]

[0063] k—elastic coefficient of the spring; x—compressed spring length (m);

[0064] μ—friction coefficient between friction pressure plate and friction plate; d—average diameter of friction pressure plate and friction plate (m);

[0065] L—length of the first pendulum rod (m); l—length of the second pendulum rod (m).

[0066] The formula (3) finally derived is an important basis for the designer to make parameter adjustments to the escape device. It can be seen from formula (3) that when the value of the escape speed V needs to be lowered, it can be adjusted by reducing the diameter of the rope wheel structure 220, the ratio of the number of teeth of the driving gear 411 and the driven gear 412, the ratio of the length of the second push rod 328 and the first swing rod 327, and the push rod angle, or by increasing the friction coefficient, average diameter, mass of the centrifugal ball 329 and the radius of gyration. Once the design parameters of the escape device are determined, the square of the user's descending escape speed V is proportional to his weight G (excluding the magnetic damping moment). Therefore, as long as the design parameters of the escape device are reasonably selected, the safe and rapid escape of people trapped in high-rise buildings can be ensured.

[0067] For further information, see Figure 1 The mounting seat 100 includes a first support seat 110 and a second support seat 120 arranged at intervals, a first support bearing 111 arranged on the first support seat 110, and a second support bearing 121 arranged on the second support seat 120, and the two ends of the driving shaft 210 are respectively penetrated on the first support bearing 111 and the second support bearing 121; the mounting seat 100 also includes a third support seat 130 and a fourth support seat 140 arranged at intervals, a third support bearing 131 arranged on the third support seat 130, and a fourth support bearing 141 arranged on the fourth support seat 140, and the two ends of the driven shaft 310 are respectively penetrated on the third support bearing 131 and the fourth support bearing 141, and the driven shaft 310 is arranged side by side with the driving shaft 210. Such an arrangement makes the installation of the entire device more stable and improves the safety of escape.

[0068] In addition, see further Figure 1 The rope winding wheel structure 220 includes a bidirectional rope winding wheel coaxially arranged with the driving shaft 210. The escape rope can be bidirectionally wound on the bidirectional rope winding wheel. Such an arrangement prevents the rope from being locked or knotted on the rope winding wheel, thereby improving the applicability of the device. Wheel rim baffles are provided at both ends of the rope winding wheel structure 220. The arrangement of the wheel rim baffles prevents the rope from falling off, thereby ensuring the stability of the entire device during operation. The rope winding wheel structure 220 also includes a spring retaining structure on the wheel rim baffle at one end of the bidirectional rope winding wheel. The spring retaining structure is used to lock the escape rope to prevent the rope from falling off and causing danger.

[0069] The above description provided by the technical solution is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A double speed-limited high-rise escape device, characterized in that: include: Mounting seat; The first speed-limiting escape mechanism comprises a driving shaft mounted on the mounting seat, and a rope-winding wheel structure and a damping speed-limiting mechanism respectively arranged at two ends of the driving shaft; A second speed limiting escape mechanism comprises a driven shaft mounted on the mounting seat, and a friction speed limiting mechanism disposed on the driven shaft; and, A transmission structure connecting the driven rotating shaft and the driving rotating shaft; Wherein, the transmission structure is set as a gear transmission structure, and the gear transmission structure and the friction speed limiting mechanism are respectively located at two ends of the driven shaft; The friction speed limiting mechanism comprises a friction disc structure provided on the driven rotating shaft, and at least one swing rod structure hingedly connecting the friction disc structure and the driven rotating shaft; The swing rod structure comprises a first swing rod hinged to the friction disc structure, and a second push rod hinged to the driven shaft, wherein the first swing rod is hinged to the second push rod; The swing rod structure further includes a centrifugal ball disposed at the end of the second push rod, and the first swing rod is hinged to the centrifugal ball; The friction plate structure includes a friction plate arranged on the driven shaft, a friction pressure plate movably sleeved on the driven shaft and correspondingly matched with the friction plate, and an elastic member arranged on the driven shaft and located between the friction plate and the friction pressure plate, and the first swing arm is hinged on the friction pressure plate; The damping speed limiting mechanism comprises a speed increasing structure arranged at one end of the driving shaft, and a magnetic damping structure arranged at the end of the speed increasing structure.

2. The dual speed-limited high-rise escape device according to claim 1, characterized in that: The friction disc structure comprises a fixing seat for fixing on a wall, the friction plate is fixed on the fixing seat, and the driven shaft rotates through the friction plate and the fixing seat.

3. The dual speed-limited high-rise escape device according to claim 1, characterized in that: The gear transmission structure includes a driving gear coaxially arranged on the driving rotating shaft, and a driven gear coaxially arranged on the driven rotating shaft, and the driven gear is meshed with the driving gear.

4. The dual speed-limited high-rise escape device according to claim 1, characterized in that: The mounting seat comprises a first support seat and a second support seat arranged at intervals, a first support bearing arranged on the first support seat, and a second support bearing arranged on the second support seat, and two ends of the driving shaft are respectively passed through the first support bearing and the second support bearing; The mounting seat also includes a third support seat and a fourth support seat arranged at intervals, a third support bearing arranged on the third support seat, and a fourth support bearing arranged on the fourth support seat, the two ends of the driven shaft are respectively passed through the third support bearing and the fourth support bearing, and the driven shaft and the driving shaft are arranged side by side.

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