A tooling for disassembling the center pin seat of an urban rail train
By designing a disassembly fixture that includes a bottom plate, a middle plate, an electric cylinder, a guide column, and a support base, the problems of difficult disassembly of the center pin seat and safety hazards were solved, enabling stable lifting and safe disassembly in confined spaces and improving disassembly efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU JUNCHENG RAIL TRANSIT EQUIP CO LTD
- Filing Date
- 2025-09-12
- Publication Date
- 2026-07-31
AI Technical Summary
In existing technologies, the disassembly of the center pin seat of urban rail trains is difficult, especially when operating in a confined space, which poses safety hazards and makes it difficult to guarantee disassembly efficiency and safety.
A disassembly fixture comprising a lower base plate, a middle plate, an upper plate, an electric cylinder, a guide post, and a support base was designed. The electric cylinder and the guide post form a stable support structure, and the center pin seat is safely disassembled by the extension and retraction of the electric cylinder and the lifting of the support base.
It enables stable lifting and safe disassembly in confined spaces, avoids damage to the center pin, improves disassembly efficiency, and reduces safety risks.
Smart Images
Figure CN224575535U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of maintenance equipment technology, specifically relating to a tooling for disassembling the center pin seat of an urban rail train. Background Technology
[0002] Urban rail trains refer to vehicles used in urban rail transit systems such as subways, light rail, suburban express rail, urban express rail, monorail, and trams. Taking subways as an example, during testing or major overhauls, it is necessary to separate the bogie from the car body. While components such as vertical shock absorbers, lateral shock absorbers, anti-roll torsion bars, and air spring pads are easily disassembled, the center pin seat, which is unique in its structure, is the only exception. One end of the center pin is connected to the car body via bolts, while the other end is a conical surface connected to the traction node of the bogie. In existing technology, the center pin seat is disassembled by lifting the car body with a lifting machine to separate it from the bogie. However, due to the limited space under the lifting machine, ordinary lifting tools are inconvenient to access. During the disassembly and installation of adjustment shims, if the center pin seat is not safely and effectively lifted, it will quickly fall, easily damaging the center pin seat and posing a significant safety hazard to maintenance personnel. Therefore, a tooling that facilitates the disassembly of the center pin seat is needed to improve disassembly efficiency and ensure safety. Utility Model Content
[0003] The purpose of this utility model is to solve the problems in the background art and provide a disassembly tool for the center pin seat of urban rail trains. This disassembly tool uses a reducer, an electric cylinder and a guide column in conjunction with a support plate to form a stable support structure between the bogie and the car body, which can lift the car body and ensure the stability of the support for the center pin seat.
[0004] The objective of this utility model is achieved through the following technical solution: A disassembly fixture for the center pin seat of an urban rail train includes a lower base plate, a middle plate, an upper plate, electric cylinders, guide columns, and support seats. The lower base plate, middle plate, and upper plate are arranged horizontally from bottom to top. Two sets of electric cylinders are symmetrically installed on both sides of the middle of the lower base plate. The cylinder body of the electric cylinder is fixedly connected to the bottom surface of the middle plate. The piston rod of the electric cylinder passes through the middle plate and connects to the bottom surface of the upper plate. Four guide columns are vertically installed between the lower base plate and the middle plate on both sides of the two sets of electric cylinders. The piston rod of the guide column passes through the middle plate and connects to the bottom surface of the upper plate. An clearance opening is machined in the middle of the upper plate between the two sets of electric cylinders. Two sets of support seats are symmetrically installed on the upper plate surface on both sides of the clearance opening, and the projection positions of the support seats and the electric cylinders correspond one-to-one. Multiple vertical stiffeners are machined on the support seats. A rubber layer is installed on the top of the support seats. The electric cylinder is connected to a control box, and a controller for controlling the extension and retraction of the electric cylinder is installed in the control box.
[0005] The upper plate is machined with positioning holes for insertion into the piston rod of the electric cylinder.
[0006] The middle plate is equipped with a linear bearing that slides with the guide piston rod.
[0007] The beneficial effects of the urban rail train center pin seat disassembly fixture provided by this utility model are: (1) By setting up an electric cylinder to push the upper plate and supporting it with guide columns, the entire tooling is compact and can be easily installed between the bogie and the car body. In addition, the electric cylinder is extended and retracted through a threaded connection, and the thread has a self-locking function, which can prevent the car frame from suddenly falling off during the pushing, holding and lowering process, effectively ensuring safety. (2) By processing the clearance opening in the middle of the upper plate, clearance space can be left for the lower protrusion of the vehicle body when the vehicle body is lifted, so as to avoid damage to the vehicle body. At the same time, the support seats are installed on both sides of the clearance opening, so that the support seats can lift the vehicle body during installation. (3) By machining positioning holes on the upper plate, the piston rod of the electric cylinder can be limited, ensuring the stability of the electric cylinder's force on the upper plate. Attached Figure Description
[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0009] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.
[0010] Figure 2 This is a front view structural diagram of an embodiment of the present utility model.
[0011] Figure 3 This is the usage state of an embodiment of the present utility model. Figure 1 .
[0012] Figure 4 This is the usage state of an embodiment of the present utility model. Figure 2 .
[0013] The markings in the diagram are: 1. Lower base plate; 2. Middle plate; 3. Upper plate; 4. Electric cylinder; 5. Guide column; 6. Support seat; 7. Clearance opening; 8. Rib plate; 9. Rubber layer; 10. Positioning hole; 11. Linear bearing; 12. Bogie; 13. Car body. Detailed Implementation
[0014] like Figure 1 , Figure 2As shown, the urban rail train center pin seat disassembly fixture provided in this embodiment includes a lower base plate 1, a middle plate 2, an upper plate 3, an electric cylinder 4, a guide column 5, and a support base 6. The lower base plate 1, middle plate 2, and upper plate 3 are arranged horizontally from bottom to top. Two sets of electric cylinders 4 are symmetrically installed on both sides of the middle of the lower base plate 1. The electric cylinders 4 are non-standard customized, and the model of the electric cylinder 4 is RLASJ60-5QF-6.7KN-R250-50MM / S. The servo motor matched with the electric cylinder 4 is a Huichuan 400W / 3000 with brake / eth. The system uses an ERCAT bus (including a driver with a 3-meter cable; driver: SV630NS2R8I; motor: MS1H4-40B30CB-T334R; power cable: S6-L-B107-3.0; encoder cable: S6-L-P124-3.0; connector: S6-C6). The electric cylinder 4 is equipped with an RLP60-5 reducer. The cylinder body of the electric cylinder 4 is fixedly connected to the bottom surface of the middle plate 2. The piston rod of the electric cylinder 4 passes through the middle plate 2 and connects to the bottom surface of the upper plate 3. Four guide pillars 5 are vertically installed on the two sets of electric cylinders. Between the lower base plate 1 and the middle plate 2 on both sides of cylinder 4, the piston rod of the guide post 5 passes through the middle plate 2 and connects to the bottom surface of the upper plate 3. An clearance opening 7 is machined in the middle of the upper plate 3 between the two sets of electric cylinders 4. The clearance opening 7 is used to avoid the lower protrusion under the vehicle body 13. Two sets of support seats 6 are symmetrically installed on the surface of the upper plate 3 on both sides of the clearance opening 7, and the projection positions of the support seats 6 and the electric cylinders 4 correspond one-to-one. The support seats 6 are used to support the mounting base of the center pin. Multiple vertical ribs 8 are machined on the support seats 6, and a rubber layer 9 is installed on the top of the support seats 6. The electric cylinder 4 is connected to a control box, which controls the extension and retraction of the electric cylinder 4. The control box is equipped with a controller for simultaneously controlling the extension and retraction of two electric cylinders 4. In use, the bus of the two electric cylinders 4 is connected to the controller. To ensure the stability of the upper plate 3, a positioning hole 10 is machined on the upper plate 3 to be inserted into the piston rod of the electric cylinder 4. The positioning hole 10 is connected to the electric cylinder 4 to prevent the upper plate 3 from slipping. A linear bearing 11 is installed on the middle plate 2 to slide with the piston rod of the guide column 5. The linear bearing 11 can ensure that the upper plate 3 moves up and down in parallel.
[0015] The method of using this utility model is as follows: A lifting machine is installed at the bottom of the front, middle, and rear ends of the chassis, avoiding the bogie 12, to lift the chassis. Figure 3 As shown, the tooling is then moved below the center pin, and the center of the tooling is aligned with the center pin axis. Next, the controller in the through-hole control box is used to set parameters such as the extension length, thrust, and speed of the electric cylinder 4. Then, the extension button is pressed. At this time, the controller controls the two electric cylinders 4 to extend synchronously and at the same speed to the designated height. The center pin mounting seat is lifted by the support seat 6, and the clearance 7 reserved in the upper plate 3 just avoids the center pin. Then, the screw plug of the center pin seat is removed. At this time, the center pin seat sits directly on the tooling. The operator then presses the retraction button, and the tooling retracts to its initial position. The center pin moves down with the tooling and separates from the vehicle body 13, as shown. Figure 4 As shown, the staff then cleaned and replaced the gaskets, accessories, and car body 13 on the center pin seat. After the replacement was completed, the extension button was pressed again to reassemble the center pin seat back onto the car body 13 and fix it with nuts. After completion, the tooling was retracted and removed to complete the disassembly, maintenance, and assembly of the center pin seat.
[0016] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications and substitutions based on the technical solutions and inventive concepts provided by the present invention should be covered within the scope of protection of the present invention.
Claims
1. A tooling for disassembling the center pin seat of an urban rail train, characterized in that: The system includes a lower base plate (1), a middle plate (2), an upper plate (3), electric cylinders (4), guide pillars (5), and a support base (6). The lower base plate (1), middle plate (2), and upper plate (3) are arranged horizontally from bottom to top. Two sets of electric cylinders (4) are symmetrically installed on both sides of the middle part of the lower base plate (1). The cylinder body of the electric cylinder (4) is fixedly connected to the bottom surface of the middle plate (2). The piston rod of the electric cylinder (4) passes through the middle plate (2) and connects to the bottom surface of the upper plate (3). Four guide pillars (5) are vertically installed between the lower base plate (1) and the middle plate (2) on both sides of the two sets of electric cylinders (4). 5) The piston rod passes through the middle plate (2) and connects to the bottom surface of the upper plate (3). The upper plate (3) between the two sets of electric cylinders (4) has a clearance opening (7) in the middle. Two sets of support seats (6) are symmetrically installed on the surface of the upper plate (3) on both sides of the clearance opening (7). The projection positions of the support seats (6) and the electric cylinders (4) correspond one-to-one. Multiple vertical ribs (8) are processed on the support seats (6). A rubber layer (9) is installed on the top of the support seats (6). The electric cylinders (4) are connected to a control box. A controller for controlling the extension and retraction of the electric cylinders (4) is installed in the control box.
2. The urban rail train center pin seat disassembly fixture according to claim 1, characterized in that: The upper plate (3) is machined with positioning holes (10) for insertion into the piston rod of the electric cylinder (4).
3. The urban rail train center pin seat disassembly fixture according to claim 1, characterized in that: A linear bearing (11) that slides with the piston rod of the guide post (5) is installed on the middle plate (2).