Escape ladder fixing pin connecting structure for intercity and city area motor train unit and motor train unit

Abstract

The invention provides an escape ladder fixing pin connecting structure for an intercity and city area motor train unit and the motor train unit, and the escape ladder fixing pin connecting structure comprises a fixing pin assembly which comprises a plunger nut, a spring, a plunger stud and a plunger screw; the plunger screw rod serves as a supporting center shaft, the upper portion of the plunger screw rod is connected with the plunger nut, the spring is arranged on the plunger screw rod in a sleeving mode, and the plunger stud is arranged outside the spring and the plunger screw rod in a sleeving mode and connected with the plunger nut; a bolt column is arranged at the lower part of the plunger screw rod; the plunger fixing seat is fixedly arranged on a longitudinal beam profile at the lower part of the escape ladder and is in threaded connection with the lower part of the plunger stud; and the plunger clamping groove is formed in an insertion inclined wedge at the upper part of the escape ladder and is used for being clamped with a bolt column at the lower part of the plunger screw rod in a locking state. According to the escape ladder fixing pin connecting structure, the operation efficiency is remarkably improved, the operation threshold is greatly reduced, the environmental adaptability is higher, and the connecting reliability is higher.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of emergency equipment of rail transit vehicles, in particular to a fixed pin connection structure of an escape ladder for an intercity and urban rail car and the rail car. BACKGROUND

[0002] In the emergency evacuation system of an intercity and urban rail car, the escape ladder as a key device, the rationality of its connection structure is directly related to the efficiency and safety of passenger evacuation in emergency situations. At present, the escape ladder connection structure used in the field of domestic intercity and urban rail cars is mainly the plug-in threaded connection structure. In the actual application process, this type of structure needs to be connected or disassembled by manually rotating the threaded part, which is complicated to operate. The installation or disassembly time of a single connection structure usually takes 3-5 minutes, which is difficult to meet the needs of rapid evacuation in emergency situations.

[0003] The defects of the prior art are as follows:

[0004] Low operation efficiency: the plug-in threaded connection structure relies on the engagement of threads to achieve fixation, and precise alignment of the thread pattern is required during rotation. Multiple rotations are needed to achieve the tightening effect. In an emergency evacuation scenario, the long operation time may delay the escape opportunity.

[0005] High operation threshold: this structure requires the operator to have some mechanical knowledge and understand the principles and operation skills of threaded connection. Ordinary passengers may not be able to quickly master the operation method in an emergency, making it difficult for them to assemble the escape ladder on their own, especially in the emergency scenarios of unmanned vehicles.

[0006] Poor environmental adaptability: in emergency situations such as fire and earthquake, power failure, obstructed vision, and structure shaking may occur inside the vehicle. The threaded connection structure may experience thread jamming and alignment difficulties in such environments, further reducing operation reliability.

[0007] With the rapid development of urban rail transit industry, unmanned intercity and urban rail cars are increasingly widely used. Unmanned vehicles eliminate the need for a driver, and when an emergency occurs, passengers must rely entirely on themselves to complete the emergency evacuation operation. This puts higher requirements on the escape ladder connection device: not only does it need to have quick disassembly and assembly capabilities, but it also needs to be simple to operate, highly reliable, and require no professional skills to meet the emergency operation needs of ordinary passengers, providing more efficient emergency protection for passenger safety. SUMMARY

[0008] The present application aims to solve the above-mentioned defects of the existing escape ladder structure of the plug-in threaded connection, thereby providing an escape ladder fixed pin connection structure for an intercity and urban rail train and a rail train, which can realize quick disassembly and assembly of the escape ladder, simplify the operation process, reduce the operation threshold, ensure that ordinary passengers can quickly complete the assembly and fixation of the escape ladder without professional training in emergency situations, gain valuable time for emergency evacuation, and improve the safety and efficiency of emergency evacuation of the intercity and urban rail train.

[0009] To achieve the above-mentioned application purposes, the present application provides an escape ladder fixed pin connection structure for an intercity and urban rail train, comprising:

[0010] The fixed pin assembly comprises a plunger nut, a spring, a plunger stud, and a plunger screw rod; the plunger screw rod serves as a supporting central shaft, the upper part of which is connected with the plunger nut, the spring is sleeved on the plunger screw rod, and the plunger stud is sleeved on the outside of the spring and the plunger screw rod and is connected with the plunger nut; the lower part of the plunger screw rod is provided with a plug-in post;

[0011] The plunger fixed seat is fixedly arranged on the lower longitudinal beam profile of the escape ladder and is threadedly connected with the lower part of the plunger stud;

[0012] The plunger clamping groove is arranged on the upper plug-in inclined notch of the escape ladder and is used for clamping the plug-in post of the lower part of the plunger screw rod in the locked state.

[0013] Further, the upper surface of the plunger nut is provided with an indication of the rotating direction, and the inside is provided with an internal thread connected with the upper part of the plunger screw rod.

[0014] Further, the inside of the plunger stud is provided with a through hole accommodating the spring and the plunger screw rod, the upper part is provided with a rotation limiting post limiting the rotation angle of the plunger nut, and the lower part is provided with an external thread connected with the plunger fixed seat.

[0015] Further, the plunger screw rod is of an integral structure, the upper end of which is provided with a connecting thread matched with the plunger nut, and the lower end is provided with the plug-in post, and the end of the plug-in post is rounded.

[0016] Further, the entrance of the plunger clamping groove is provided with a guide inclined surface, and the inside is provided with a positioning step.

[0017] Further, the plunger fixed seat is fixed on the lower longitudinal beam profile of the escape ladder by welding, and the inside is processed with a threaded hole matched with the lower part of the plunger stud.

[0018] The present application also provides an intercity and urban rail train equipped with the above-mentioned escape ladder fixed pin connection structure.

[0019] The present application has the following advantages over the prior art:

[0020] 1. Significant improvement in operation efficiency

[0021] The existing domestic railway vehicle emergency evacuation ladder has a threaded connection structure. The locking and unlocking operation of a single set of device requires an average of 3-5 minutes. The present application adopts a mechanical quick-lock mechanism, which can be completed by simple pulling, rotating, and falling actions. The entire process only takes 5-10 seconds, achieving instantaneous locking and unlocking, with a response time of milliseconds, which is much faster than the traditional manual threaded connection structure, and can gain more valuable time for emergency escape.

[0022] 2. Significant reduction in operation threshold

[0023] The traditional threaded connection structure requires the operator to understand the threaded connection principle and master the correct rotation method and force. Ordinary passengers may not be able to quickly grasp it in an emergency. The present application optimizes the structure design, uses intuitive identification guidance and simple mechanical actions, and does not require professional mechanical knowledge and skills. Any passenger can quickly understand and operate, perfectly adapting to the emergency scene of unmanned vehicles without professional assistance.

[0024] 3. Stronger environmental adaptability

[0025] The traditional threaded connection structure is prone to problems such as threaded jamming and alignment difficulty in complex emergency environments such as power failure, obstructed vision, and vibration, leading to operation failure. The mechanical quick-lock structure of the present application does not rely on power driving and achieves locking and unlocking through manual mechanical operation. Even in a vehicle power failure or dim light environment, passengers can complete the operation by tactile perception of the rotation resistance and position change of the plunger nut. At the same time, the cooperation gap between the device components is precisely calculated and controlled within 0.05-0.1mm. In the case of vehicle vibration or shaking, the structure remains stable, avoiding component misalignment or jamming, and ensuring the reliability of emergency operation.

[0026] 4. Higher connection reliability

[0027] The tightening effect of the traditional threaded connection structure depends on the rotation force of the operator. If the force is insufficient, the connection may loosen and cannot withstand the load during passenger evacuation. If the force is too large, it may damage the threads and affect subsequent disassembly. The present application achieves automatic locking through the elastic tension of the spring and the mechanical cooperation of the plunger clamping groove and the bolt column, without the need for manual control of the tightening force. Tests have shown that the device can withstand a longitudinal tensile force of not less than 5000N and a transverse shear force of not less than 3000N in the locked state, which is much higher than the carrying capacity of the traditional threaded connection structure. After withstanding 1000 times of reciprocating load, there is no loosening, deformation, or other phenomena, and the connection reliability is significantly improved.

[0028] 5. Better structural durability

[0029] The threaded part of the existing threaded connection structure is prone to wear and corrosion due to frequent disassembly and assembly or environmental corrosion, resulting in a shortened service life, usually 2-3 years. The core components of the present application are made of high corrosion-resistant and high wear-resistant materials such as 304 stainless steel, 316 stainless steel, 7075 aluminum alloy, etc., and the key matching parts are surface hardened to a surface hardness of HRC45-50, effectively improving the anti-wear ability of the parts. At the same time, the whole device adopts a sealed design, which can prevent dust and water vapor from entering the internal structure and reduce the risk of corrosion. Through accelerated aging test, the service life of the device can reach 8-10 years under the simulated EMU carriage environment temperature of-40℃-80℃ and humidity of 30%-95%, which is 3-4 times that of the traditional threaded connection structure, greatly reducing the maintenance cost and replacement frequency. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the escape ladder fixing pin connection structure of the present application;

[0031] Figure 2 is a front view of the plunger nut;

[0032] Figure 3 is a left view of the plunger nut;

[0033] Figure 4 is a sectional view of the plunger nut;

[0034] Figure 5 is a bottom view of the plunger nut;

[0035] Figure 6 is a schematic diagram of the plunger nut structure;

[0036] Figure 7 is a front view of the plunger stud;

[0037] Figure 8 is a left view of the plunger stud;

[0038] Figure 9 is a sectional view of the plunger stud;

[0039] Figure 10 is a bottom view of the plunger stud;

[0040] Figure 11 is a sectional view of the lower part of the plunger stud;

[0041] Figure 12 is a schematic diagram of the plunger stud structure;

[0042] Figure 13 is a schematic diagram of the plunger rod structure;

[0043] Figure 14 is a front view of the escape ladder fixing pin connection;

[0044] Figure 15 is the fixed pin connection plan view of escape ladder;

[0045] Figure 16 is the fixed pin connection left view of escape ladder;

[0046] Wherein: 1-plunger nut; 2-spring; 3-plunger stud; 4-plunger screw; 5-plunger clamping groove; 6-escape ladder lower longitudinal beam profile; 7-escape ladder upper plug-in skew; 8-plunger fixing seat; 9, limit column; 10, fixed pin. DETAILED DESCRIPTION

[0047] In order to better understand the purpose, structure and function of the present application, the present application and the motor train unit are further described in detail below in combination with the drawings.

[0048] I. Technical scheme summary

[0049] The present application is a kind of escape ladder fixed pin device for intercity city area motor train unit, belongs to escape ladder connection fastening device. The device replaces the traditional threaded connection structure through mechanical quick lock mechanism, realizes the quick splicing and fixing of the upper and lower parts of escape ladder. When the vehicle needs to be evacuated in emergency, passengers can take out the evacuation ladder device according to the voice prompt of vehicle broadcast and the prompt of the label, place the upper and lower parts of escape ladder in order, and quickly complete the locking connection of the two through the simple operation of the fixed pin device of the present application, so as to gain more safety time for emergency escape work.

[0050] II. Overall structure composition

[0051] Referring to Figures 1 to 16 The present application provides an escape ladder fixed pin connection structure for intercity city area motor train unit, which comprises a fixed pin assembly, a plunger clamping groove 5, an escape ladder lower longitudinal beam profile 6, an escape ladder upper plug-in skew 7 and a plunger fixing seat 8. The fixed pin assembly 10 comprises a plunger nut 1, a spring 2, a plunger stud 3 and a plunger screw 4.

[0052] III. Detailed parameters and functions of each component

[0053] 1, plunger nut 1

[0054] Material selection: round stainless steel material, model 304 stainless steel, good machining performance and surface finish, easy to process and mark printing.

[0055] Machining process: processed by numerical control machine tool, the machining process includes blanking, turning, drilling, threading, surface polishing and other processes, surface polishing treatment can improve the feel and aesthetics of the part, and reduce the friction resistance during operation.

[0056] Structural parameters: The overall diameter is 36mm and the height is 20mm. The internal threads are machined with M10×1.5 to match the upper threads of the plunger screw. The thread depth is 30mm. The upper surface is printed with a mark indicating the switch direction. The mark is laser engraved, which is clear and durable. The mark contains "on" and "off" and the corresponding arrow direction. The arrow angle is 90 degrees.

[0057] Function: As a fixing component for the upper rotating handle and plunger screw, it facilitates the lifting and rotating operation for passengers. It is connected to the plunger screw through internal threads, driving the plunger screw to move synchronously. At the same time, the markings guide passengers to operate correctly.

[0058] 2. Spring 2

[0059] Material selection: 304 stainless steel is used. This material has excellent corrosion resistance, wear resistance and elastic recovery ability, which can adapt to the environment inside the EMU carriage and avoid spring failure due to factors such as moisture and vibration.

[0060] Processing technology: The spring is formed by cold rolling, which ensures the dimensional accuracy and elastic stability of the spring. During the processing, parameters such as winding speed and winding diameter are precisely controlled to ensure that the spring meets the design elasticity requirements.

[0061] Structural parameters: spring wire diameter is 2.5mm, spring outer diameter is 18mm, free height is 30mm, working number of coils is 6, effective number of coils is 4, both ends are tightly ground flat to ensure that the spring is subjected to uniform force during compression and extension.

[0062] Function: It mainly serves as a spring limiter and resetter. After the spring is fitted into the plunger screw, it keeps the knob in a locked state by its own elastic tension when idle, and provides power for the plunger nut to reset during operation.

[0063] 3. Plunger stud 3

[0064] Material selection: Hexagonal stainless steel, model 316 stainless steel, is used. Compared with 304 stainless steel, this material has stronger corrosion resistance and mechanical strength, and can adapt to the stress requirements and operating environment of the device.

[0065] Processing technology: The product is formed by machining processes, including sawing, milling, drilling, and threading. The hexagonal structure is machined by milling to ensure the flatness and perpendicularity of each surface. The threading is done by tapping to ensure thread accuracy.

[0066] Structure parameters: the overall height is 40 mm, the hexagonal opposite side distance is 24 mm, a through hole with a diameter of 12 mm is processed inside for accommodating the spring and plunger screw, 2 symmetrical rotation limiting columns 9 are processed in the upper part with a height of 5 mm and a diameter of 4 mm, and M16x2 threaded structure is processed in the lower part with a threaded length of 20 mm matched with the thread of the plunger fixing seat.

[0067] Functional role: it plays a connecting and limiting role, cooperates with the plunger nut 1 through the rotation limiting column 9 to limit the rotation angle of the plunger nut, ensures the accuracy of operation, and connects with the plunger fixing seat through the lower thread to realize the overall installation of the fixing pin device.

[0068] 4, plunger screw 4

[0069] Material selection: 45# round steel material is adopted, which has high strength and toughness, and can withstand the mechanical load in the process of rotation and plugging after processing, ensuring the structural stability of the device.

[0070] Processing technology: precision machining is adopted by numerical control machine tool, and the processing flow includes blanking, turning, milling, thread processing and other processes. The size accuracy of the part can be guaranteed by numerical control machine tool processing, with an error control within ±0.02 mm.

[0071] Structure parameters: the overall length is 80 mm, the diameter is 12 mm, the plug-in pin with a diameter of 8 mm and a length of 25 mm is processed in the lower part, the connecting thread of M10x1.5 is processed in the upper part with a threaded length of 30 mm, and the end of the plug-in pin is treated with a round corner with a radius of 1 mm, which is convenient for cooperation with the plunger clamping groove.

[0072] Functional role: as the overall support framework, rotating shaft and lower plug-in pin of the device, it provides installation basis for other parts, and realizes the cooperation and separation of the plug-in pin and the plunger clamping groove through rotation, completes the locking and unlocking operation.

[0073] 5, plunger clamping groove 5

[0074] Processing technology: the specified position of the escape ladder is milled by numerical control machine tool, and the workpiece is fixed by special fixture during processing to ensure the position accuracy of the clamping groove, with a position error control within ±0.1 mm.

[0075] Structure parameters: a guide slope is arranged at the entrance of the clamping groove with an angle of 30 degrees, which is convenient for the plug-in pin of the plunger screw to enter the clamping groove smoothly, and a positioning step is arranged inside the clamping groove with a height of 2 mm, which can accurately position the plug-in pin after entering and avoid loosening.

[0076] Function: As a locking structure, it forms a mechanical lock with the plug post of the plunger screw, and through the close fit of the two, it realizes the stable connection of the upper and lower parts of the escape ladder, preventing separation during use.

[0077] 6, escape ladder lower longitudinal beam profile 6

[0078] Material selection: 6061 aluminum alloy material is used, which has the advantages of light weight, high strength, corrosion resistance, etc., which can reduce the overall weight of the escape ladder while ensuring the structural strength, and meet the lightweight demand of the motor train unit.

[0079] Processing technology: extrusion forming process is used, which can realize the processing of complex cross-sectional shape, has high production efficiency, and can ensure the dimensional accuracy and mechanical properties of the profile. Followed by cutting, drilling and other processes for finishing.

[0080] Structural parameters: the cross section is rectangular, the width is 80mm, the height is 60mm, the wall thickness is 5mm, and the length is determined according to the design size of the escape ladder, usually 1500-2000mm. The corresponding mounting surface is processed at the position welded with the plunger fixing seat, and the flatness error is controlled within ±0.5mm.

[0081] Function: As the main bearing structure of the lower part of the escape ladder, it provides the basis for the insertion of the upper part of the escape ladder, and through the welding of the plunger fixing seat, it realizes the installation and fixation of the fixed pin device.

[0082] 7, escape ladder upper part insertion inclined wedge 7

[0083] Material selection: solid aluminum block material is used, model 7075 aluminum alloy, which has very high strength and can withstand the load during passenger evacuation, ensuring the structural stability of the insertion part.

[0084] Processing technology: precision machining is carried out on numerical control machine tools, and the processing flow includes blanking, milling, drilling, polishing and other processes. The milling process is used to process the insertion structure matching the lower longitudinal beam profile of the escape ladder, and the polishing process can improve the smoothness of the insertion surface, facilitating the insertion and extraction operation.

[0085] Structural parameters: the overall length is 100mm, the width is 70mm, and the height is 50mm. The plunger clamping groove is processed at the matching position with the lower longitudinal beam profile, and the size of the clamping groove is 10mm×8mm×25mm long×wide×deep. The inner wall of the clamping groove is treated with round corners, and the round corner radius is 1mm, which ensures perfect fit with the plug post of the plunger screw.

[0086] Function: Cooperate with the escape ladder lower longitudinal beam profile to realize the splicing of the escape ladder. Through the cooperation of the plunger clamping groove and the plug-in column of the fixed pin device, the upper and lower parts of the escape ladder are locked and fixed.

[0087] 8, plunger fixing seat 8

[0088] Material selection: Q235 carbon steel material is used, which has high strength and welding performance, and can meet the welding and fixing requirements of the escape ladder lower longitudinal beam profile.

[0089] Processing technology: formed by stamping and machining process. First, the approximate shape is made by stamping process, and then the threads and mounting surface are processed by machining process. The thread processing adopts tapping process, and the mounting surface is milled to ensure flatness.

[0090] Structural parameters: overall cylindrical shape, diameter 40mm, height 30mm, M16x2 threaded hole processed inside, threaded depth 25mm, matched with the lower thread of the plunger stud, the bottom is provided with a welding bevel with an angle of 45 degrees, which is convenient for welding with the escape ladder lower longitudinal beam profile.

[0091] Function: As the installation basis of the fixed pin device, it is fixed on the escape ladder lower longitudinal beam profile by welding, providing stable installation support for the entire fixed pin device, ensuring that the device does not displace during use.

[0092] Four, the assembly process of the escape ladder fixed pin connection structure for intercity urban motor train units

[0093] 1, fixed pin assembly

[0094] First, put the spring 2 into the designated position of the plunger stud 4, make sure the spring ends fit the limiting structure of the plunger stud, and realize the limiting installation of the spring; second, insert the plunger stud 4 with spring into the internal through hole of the plunger stud 3, make sure the upper thread of the plunger stud is exposed from the upper end surface of the plunger stud; third, insert the assembled plunger stud and plunger stud assembly into the mounting clamping groove of the plunger nut 1, rotate the plunger stud to make the plunger stud tightly connected with the clamping groove thread on the plunger nut, ensure the connection is firm and no loose phenomenon; fourth, check the assembled fixed pin assembly, make sure the plunger nut can rotate flexibly, the rotation angle meets the design requirement of 90 degrees, and the spring has normal elastic recovery without jamming phenomenon.

[0095] 2, fixed pin connection structure installation

[0096] First, the assembled fixed pin composition is inserted into the threaded hole of the plunger fixed seat 8, and the fixed pin composition is screwed and connected with the threads on the plunger fixed seat by rotating the plunger stud 3, and the tightening torque is controlled at 25-30 N·m to ensure the connection strength; second, the plunger fixed seat 8 is fixed on the designated position of the escape ladder lower longitudinal beam profile 6 by welding, the welding adopts argon arc welding process, the welding current is 120-150 A, the welding speed is 5-8 mm / s, and after the welding is completed, the weld is polished to ensure that the weld is flat and free of pores, cracks and other defects; third, check the plunger clamping groove 5 machining precision of the escape ladder upper insertion inclined wedge 7, ensure the size matching of the plunger screw rod plug pin of the fixed pin composition; fourth, the escape ladder upper insertion inclined wedge 7 is inserted into the escape ladder lower longitudinal beam profile 6, ensuring smooth insertion, and checking whether the locking and unlocking functions of the fixed pin device are normal.

[0097] Five, the working principle of the escape ladder fixed pin connection structure for intercity city area motor train unit

[0098] 1, idle state

[0099] When the escape ladder is in idle state, the spring 2 is in natural stretching state, and the downward pressure on the plunger screw rod 4 is generated by the elastic tension of the spring itself, which drives the plunger nut 1 to be in the locked position, at this time, the plug pin at the lower part of the plunger screw rod is in the extended state, which keeps cooperation or is in the state of cooperation with the plunger clamping groove 5 of the escape ladder upper insertion inclined wedge 7, ensuring the stable fixation of the escape ladder.

[0100] 2, unlocking operation

[0101] When the escape ladder is needed, the passenger pulls the plunger nut 1 by hand according to the prompt, the plunger nut drives the plunger screw rod 4 to move upward, compressing the spring 2, when the plunger nut is pulled to the specified height, it is rotated clockwise by 90 degrees, at this time, the rotation limiting column 9 on the plunger stud 3 cooperates with the clamping groove of the plunger nut 1, limiting the plunger nut from falling back, so that the fixed pin device is in the open state, the plug pin at the lower part of the plunger screw rod is retracted and separated from the cooperation position of the plunger clamping groove.

[0102] 3, locking operation

[0103] Align the escape ladder upper insertion inclined wedge 7 with the insertion position of the escape ladder lower longitudinal beam profile 6, slowly insert until in place, ensuring that the insertion surfaces of the two are tightly fitted; then, rotate the plunger nut counterclockwise by 90 degrees, remove the limiting action of the rotation limiting column 9, the spring 2 pushes the plunger screw rod 4 to move downward under the action of elastic restoring force, drives the plunger nut to fall back, the plug pin at the lower part of the plunger screw rod is extended and accurately embedded into the plunger clamping groove 5 of the escape ladder upper insertion inclined wedge, realizing the connection and locking of the upper and lower parts of the escape ladder, at this time, the escape ladder can stably bear the passengers to evacuate.

[0104] The application further provides an intercity and city area motor train unit equipped with the escape ladder fixing pin connecting structure.

Claims

1. An escape ladder fixing pin connection structure for an intercity and metropolitan EMU, characterized in that, The utility model relates to a kind of escape ladder fixed pin connection structure, including: Fixed pin group, including plunger nut (1), spring (2), plunger stud (3) and plunger screw (4);The plunger screw (4) is as support axle, upper portion is connected with the plunger nut (1), the spring (2) is sleeved on the plunger screw (4), the plunger stud (3) is sleeved on the spring (2) and plunger screw (4) outside, and is connected with the plunger nut (1);The lower portion of the plunger screw (4) is equipped with plug-in post; Plunger fixed seat (8) is fixedly arranged on escape ladder lower portion longitudinal beam profile (6), and is connected with the lower portion screw thread of plunger stud (3); Plunger clamping groove (5) is arranged on escape ladder upper portion plug-in inclined contract (7), for when locking state with the plunger screw (4) lower portion plug-in post is clamped.

2. The intercity and metropolitan rail motor train unit escape ladder fixing pin connection structure according to claim 1, characterized in that, The upper surface of the plunger nut (1) is provided with an indication of the direction of rotation, and the inner portion is provided with an internal thread connected with the upper portion of the plunger screw (4).

3. The fixed pin connection structure of the escape ladder for the intercity and metropolitan EMUs according to claim 1 or 2, characterized in that, The plunger stud (3) is internally provided with a through hole for accommodating the spring (2) and plunger screw (4), and is provided with a rotation limiting column (9) at the upper portion for limiting the rotation angle of the plunger nut (1), and is provided with an external thread at the lower portion for connecting with the plunger fixed seat (8).

4. The intercity and metropolitan rail motor train unit escape ladder fixing pin connection structure according to claim 3, characterized in that, The plunger screw (4) is of integral structure, and the upper end is provided with a connecting thread matched with the plunger nut (1), and the lower end is provided with the plug-in post, and the end of the plug-in post is rounded.

5. The intercity and metropolitan rail motor train unit escape ladder fixing pin connection structure according to claim 1, characterized in that, The entrance of the plunger clamping groove (5) is provided with a guide slope, and the inner portion is provided with a positioning step.

6. The intercity city regional motor train unit escape ladder fixing pin connection structure according to claim 1, characterized in that, The plunger fixed seat (8) is fixed on the escape ladder lower portion longitudinal beam profile (6) by welding, and the inner portion is processed with a threaded hole matched with the lower portion screw thread of the plunger stud (3).

7. An intercity city regional motor train unit, characterized in that, Equipped with escape ladder fixed pin connection structure as claimed in claims 1-6.

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