Movable self-locking clamping jaw mechanism of portable urban rail rescue ladder
By setting up self-locking clamp mechanisms of guide rails, sliders, claws and torsion springs on the rescue ladder, the problem of unsolid fixation of the rescue ladder is solved, and rapid and safe evacuation in emergencies is achieved, and the stability and operation convenience of the rescue ladder are improved.
Patent Information
- Application Number
- CN202422070994.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-26
AI Technical Summary
The existing urban rail transit vehicle rescue ladder is not fixed in an emergency, resulting in low passenger evacuation efficiency and safety risks. The traditional rescue ladder operates complex, inconvenient, and takes up a large space.
A portable urban rail rescue ladder movable self-locking clamp mechanism is designed. Through the structural cooperation of guide rails, sliders, clamps and torsion springs, the clamps are fastened and locked on the fixing table, improving stability, and having automatic reset function.
It improves the stability and safety of the rescue ladder on the fixed platform, simplifies operation, improves evacuation efficiency and convenience of use, and adapts to different rescue scenarios.
Smart Images
Figure CN223062361U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of appliances for urban rail transit vehicles, in particular to a portable self-locking claw mechanism for a movable urban rail rescue ladder. Background Art
[0002] With the increasing complexity of urban rail transit systems and the continuous increase in passenger flow, passengers have higher and higher requirements for the functionality, comfort, and safety of railway products.
[0003] Currently, subway evacuation doors are set at the head of the train. In case of emergency, the evacuation efficiency of passengers in the middle carriages is relatively low, and safety risks are likely to occur; there are still some limitations in the design and function of traditional EMU escape ladders. For example, in actual use, multiple personnel are required to manually cooperate to unfold and fold them. It is not convenient to use, the operation is relatively difficult, it takes a long time, the efficiency is low, and it is inconvenient to fold up and occupies a large space inside the car, which brings many inconveniences in case of emergency.
[0004] In order to quickly evacuate passengers in case of emergency, a quick-fold emergency ladder should have the function of quickly unfolding in case of emergency; in case of emergency, how to quickly and safely evacuate passengers is an important issue that must be faced in train design and operation. Currently, one end of the train rescue ladder is generally set to lean against a fixed location, and there is a problem that it is not firmly fixed to fixed locations such as platforms and trains. As a result, the rescue ladder slides or is unstable during use, causing the rescued person to shake unsteadily during the climbing process through the rescue ladder, resulting in a slow rescue speed. It may also cause personal safety problems such as the rescued person being injured due to the instability of the rescue ladder.
[0005] Therefore, this application proposes a portable self-locking claw mechanism for a movable urban rail rescue ladder, which is used to improve the stability of the rescue ladder after fixation, thereby improving the safety performance during use and the rescue efficiency. Summary of the Utility Model
[0006] In view of the above defects or deficiencies in the prior art, it is desirable to provide a portable self-locking claw mechanism for a movable urban rail rescue ladder.
[0007] A portable self-locking claw mechanism for a movable urban rail rescue ladder provided by the utility model is arranged at the end of the ladder frame of the rescue ladder. It is characterized in that it includes self-locking claw assemblies symmetrically arranged on both side surfaces of the ladder frame; each self-locking claw assembly includes a guide rail, a slider is arranged inside the guide rail, a bolt is threadedly connected to the slider, and a claw is fixedly arranged at the end of the bolt away from the slider; a torsion spring is sleeved on the outer circumference of the bolt, one end of the torsion spring abuts against the wall surface of the slider, and the other end abuts against the inner side surface of the claw.
[0008] Further, the guide rail includes symmetric Z-shaped guide rail strips fixedly arranged on the outer side surface of the ladder frame, and the slider is slidably arranged inside the two Z-shaped guide rail strips; the height of the slider is set to be less than the height inside the Z-shaped guide rail strip.
[0009] Further, the bolt passes through between the two Z-shaped guide rail strips and is threadedly connected to the slider.
[0010] Further, the claw is arranged to be strip-shaped, and a toothed groove is arranged on the side surface of the claw in contact with the fixed table.
[0011] Further, the guide rail is arranged along the length direction of the rescue ladder in the unfolded state.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] The portable urban rail rescue ladder of the present utility model has a movable self-locking claw mechanism. Through the structural design of the guide rail, slider, claw and torsion spring, when they cooperate together, the claw is rotated and fixed on a fixed table such as a platform. During this process, the claw drives the bolt to rotate. Since the bolt is threadedly connected to the slider, the rotation of the bolt drives the slider to clamp tightly towards the inner side of the guide rail track (that is, move towards the claw direction), ensuring the limitation of the position of the slider, thereby realizing the fastening of the claw and the bolt during use and improving safety;
[0014] After use, the claw automatically rotates and resets under the action of the torsion spring. During this process, the slider moves away from the claw direction, and then loosens from the inner side of the guide rail. The slider can move along the length direction of the guide rail inside the guide rail, realizing the movable function of the rescue ladder claw. The height position of the claw can be adjusted according to different rescue sites, improving its practicability. Moreover, it has the kinetic energy of self-locking in the use state, improving the safety performance during use, and further enhancing the working efficiency.
[0015] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the present utility model, nor to limit the scope of the present utility model.
[0016] Other features of the present utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present utility model will become more obvious:
[0018] Figure 1 It is a schematic structural diagram after the installation of a movable self-locking claw mechanism of a portable urban rail rescue ladder provided by an embodiment of the present utility model;
[0019] Figure 2 Schematic structural diagram of the self-locking jaw mechanism after folding;
[0020] Figure 3 Schematic structural diagram of the self-locking jaw mechanism after unfolding;
[0021] Figure 4 Schematic structural diagram of the self-locking jaw mechanism after unfolding at a certain angle θ;
[0022] Reference numerals in the figure: 1. Self-locking jaw assembly; 11. Guide rail; 111. Z-shaped guide rail strip; 112. Slide block; 12. Bolt; 13. Jaw; 14. Torsion spring; 2. Ladder frame; 3. Fixed platform. Detailed implementation manners
[0023] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. In addition, it should be noted that, for the sake of description, only the parts related to the utility model are shown in the drawings.
[0024] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.
[0025] Please refer to Figures 1 to 4 , the embodiment of the present utility model provides a portable urban rail rescue ladder with a movable self-locking jaw mechanism, which is arranged at the end of the ladder frame 2 of the rescue ladder and is used for clamping and limiting with the fixed platform to ensure the stability between the whole rescue ladder and the fixed platform 3 and improve the safety performance.
[0026] The self-locking jaw mechanism includes two groups of self-locking jaw assemblies 1, and the two groups of self-locking jaw assemblies 1 are symmetrically arranged on both side surfaces at the top of the ladder frame 2;
[0027] Each self-locking jaw assembly 1 includes a guide rail 11, a slide block 112 is arranged inside the guide rail 11, a bolt 12 is threadedly connected to the slide block 112, and a jaw 13 is fixedly arranged at one end of the bolt 12 away from the slide block 112; a torsion spring 14 is sleeved on the outer circumference of the bolt 12, one end of the torsion spring 14 abuts against the wall surface of the slide block 112, and the other end abuts against the inner side surface of the jaw 13.
[0028] In a preferred embodiment, the guide rail 11 includes symmetric Z-shaped guide rail strips 111 fixedly arranged on the outer side surface of the ladder frame 2. The two Z-shaped guide rail strips 111 are symmetrically arranged, so that a strip-shaped opening is formed between the two Z-shaped guide rail strips 111. Through this strip-shaped opening, the bolt 12 can pass through and be threadedly connected with the slider 112, so that the slider 112 can be adjusted to slide along the length direction of the guide rail 11 and its position on the guide rail 11 can be adjusted;
[0029] The slider 112 is slidably arranged inside the two Z-shaped guide rail strips 111; the height of the slider 12 is set to be less than the height inside the Z-shaped guide rail strip 111. One is to facilitate the up and down sliding movement of the slider 112 inside the guide rail 11, and the other is that the tightness between the slider 112 and the inner side wall surface of the guide rail 11 can be adjusted through the bolt 12, so as to limit and lock the position of the claw 13.
[0030] In a preferred embodiment, the claw 13 is set to be strip-shaped, and a toothed groove is arranged on the side surface of the claw 13 in contact with the fixed platform 3, so as to increase the friction between the claw and the fixed platform, and further improve the stability after the claw 13 is installed on the fixed platform 3.
[0031] In a preferred embodiment, the guide rail 11 is arranged along the length direction of the rescue ladder in the unfolded state.
[0032] The working principle of the present utility model:
[0033] The rail transit rescue ladder claw 13 is fixedly connected with the bolt 12, and the bolt 12 is threadedly connected with the slider 112. While the guide rail 11 arranged on the side surface of the ladder frame 2 provides a moving track for the slider 112, it can also limit the rotation of the slider 112 to ensure that the slider 112 can only move along the axial direction of the bolt 12. In addition, anti-falling designs are arranged at both the upper and lower ends of the guide rail 11, and structures such as baffles and stoppers can be used to be arranged at both ends of the guide rail 11 to prevent the slider 112 from sliding out.
[0034] In the initial state, the included angle between the claw 13 and the length direction of the rail transit rescue ladder is 0; when in use, the claw 13 and the bolt 12 rotate clockwise, and the included angle with the length direction of the rail transit rescue ladder is θ. Please refer to Figure 4 , the slider 112 moves towards the claw 13 through the relative motion principle of the thread. Thus, while opening the claw 13, the slider 112 is clamped tightly with the inner side of the guide rail 11 of the track, ensuring the limitation of the position of the slider 112, so as to realize the fastening of the claw 13 and the bolt 12 during use and improve safety.
[0035] In addition, a torsion spring 14 is sleeved on the outer ring of the bolt 12. One end of the torsion spring 14 is supported on the inner side of the claw 13, and the other end is supported on the surface of the slider 112. Thus, while the claw 13 and the bolt 12 rotate, the torsion spring 14 is compressed in the circumferential direction and generates a force opposite to the rotation direction of the claw 13 and the bolt 12, thereby providing a positive pressure for the claw 13 to contact the surface of the fixed platform 3, increasing the friction force between the claw 13 and the surface of the fixed platform 3, and improving the reliability of preventing the claw 13 from tipping over.
[0036] Furthermore, after the urban rail rescue ladder is used up, the claw 13 rotates counterclockwise and automatically resets under the force of the torsion spring 14. At the same time, the slider 112 moves away from the claw 13, and then loosens from the inner side of the guide rail 11. The slider 112 can move inside the guide rail 11, realizing the movable position of the claw 13 of the urban rail rescue ladder, which can adapt to different rescue scenarios, has strong practicability, and has the function of self-locking in the use state.
[0037] The utility model fixes the claw on the surface of the fixed platform, thereby realizing the fixation of the rescue ladder on the fixed platform, improving the stability of the rescue ladder after installation and during use, and realizing the functions of self-locking and automatic reset through structures such as torsion springs, with simple operation and convenient use.
[0038] After the claw 13 rotates a certain angle θ through the torsion spring 14 and is compressed to generate a force for resetting, at the same time, after the claw 13 and the bolt 12 rotate this angle, the slider 112 moves a certain distance related to the lead of the bolt 12 to ensure that the slider 112 and the inner side of the guide rail 11 are tightly clamped. Therefore, it is crucial to determine parameters such as the rotation angle θ, the torsion spring force, and the bolt lead.
[0039] The torsion formula of the torsion spring can be expressed as:
[0040]
[0041] In the formula, T represents the torsion, P is the load, R is the lever arm length, E is the material elastic modulus, d is the wire diameter, is the angle when the load acts, n is the number of effective turns, D is the mean diameter; the K part represents the spring constant of the torsion spring.
[0042] The spring constant k of the torsion spring is an important parameter, which reflects the stiffness and elastic characteristics of the torsion spring. The spring constant k can be measured through experiments or calculated according to the geometric dimensions and material characteristics of the torsion spring. Generally speaking, the larger the spring constant of the torsion spring, the greater the influence of the torsion on the torsion angle, and the higher the stiffness of the torsion spring. The torsion angle of the torsion spring refers to the angle change that occurs when the torsion spring is subjected to a torsional moment. The torsion angle is related to the geometric dimensions, material characteristics, and external moment size of the torsion spring. In practical applications, it is necessary to determine the range of the torsion angle according to specific design requirements and working conditions.
[0043] According to the principle of relative movement of the thread, the distance that the bolt moves in one revolution is determined by the lead. Therefore, the distance moved after rotating a certain angle θ can be calculated from the lead. The formula is as follows:
[0044]
[0045] In the formula, L is the moving distance after rotating the angle θ, and P is the lead of the bolt.
[0046] Furthermore, the relationship between the torsion of the torsion spring and the moving distance of the bolt can be obtained as follows:
[0047]
[0048] Among them, both K and P are fixed constants. Therefore, the overall constant part can be expressed as a constant C. Furthermore, the torsion of the torsion spring and the moving distance of the bolt are in a linear relationship. Knowing one of them can determine the other, laying a theoretical foundation for designing the claw module parameters of the urban rail rescue ladder for different working conditions. Since the value of L is small, the deformation generated by the compression of the torsion spring after the slider moves this distance does not have an obvious impact on the torsion spring force.
[0049] In the description of this specification, terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0050] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0051] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.
Claims
1. A portable movable self-locking jaw mechanism for urban rail rescue ladders, which is arranged at the end of the ladder frame of the rescue ladder, and is characterized in that, It includes self-locking jaw assemblies symmetrically arranged on both side surfaces of the ladder frame; the self-locking jaw assembly includes a guide rail, a slider is arranged inside the guide rail, a bolt is threadedly connected to the slider, and a jaw is fixedly arranged at one end of the bolt away from the slider; a torsion spring is sleeved on the outer circumference of the bolt, one end of the torsion spring abuts against the wall surface of the slider, and the other end abuts against the inner side surface of the jaw.
2. The movable self-locking jaw mechanism of the portable urban rail rescue ladder according to claim 1, characterized in that, The guide rail includes Z-shaped guide rail strips symmetrically and fixedly arranged on the outer side surface of the ladder frame, and the slider is slidably arranged inside the two Z-shaped guide rail strips; the height of the slider is set to be less than the height inside the Z-shaped guide rail strip.
3. The movable self-locking jaw mechanism of the portable urban rail rescue ladder according to claim 2, wherein, The bolt passes between the two Z-shaped guide rail strips and is threadedly connected to the slider.
4. The movable self-locking jaw mechanism of the portable urban rail rescue ladder according to claim 1, characterized in that, The jaw is arranged in a long strip shape, and a toothed groove is arranged on the side surface of the jaw in contact with the fixed table.
5. The portable urban rail rescue ladder movable self-locking jaw mechanism according to claim 1, characterized in that, The guide rail is arranged along the length direction of the rescue ladder in the unfolded state.