Decoupling cylinder disassembly and maintenance tooling

Abstract

The utility model relates to the technical field of hook air cylinder disassembly and overhauling, and disclose a hook air cylinder disassembly and overhauling tool, including bottom plate, still include: two symmetrical distribution's limit support board, limit support board bottom all with bottom plate top fixed connection, the hook air cylinder is located in two limit support board middle, and limit support board all install the clamping piece for to the hook air cylinder clamping, stand, stand bottom with bottom plate top fixed connection, bottom plate top fixed connection has for to the hook air cylinder's cylinder cover limit's limit block, the stand is connected with the pressure fork of lifting, when the assembly and disassembly piston, for pressing the reset spring of the hook air cylinder, the utility model discloses utilize the index pin can realize fast to the hook air cylinder and fix, the assembly and disassembly of convenient cylinder cover and the fixing of the hook air cylinder when manual test, then utilize the spring compression mechanism such as pressure fork, can when the assembly and disassembly piston, to the reset spring press, prevent reset spring suddenly and hurt, improve use safety.

Description

Technical Field

[0001] This utility model relates to the field of disassembly and repair of unhooked air cylinders, specifically to tooling for disassembling and repairing unhooked air cylinders. Background Technology

[0002] The uncoupling air cylinder is the actuator cylinder of the pneumatic uncoupling system for close-coupled vehicles. During automatic uncoupling, it inflates to push the piston rod, causing the uncoupling rod to rotate the hook tongue to the unlocked position. After uncoupling, it exhausts air, and the spring returns the hook tongue to the ready-to-coup position, ensuring the reliability of reconnection and uncoupling. The uncoupling air cylinder mainly consists of a cylinder body and cylinder head, piston and piston rod assembly, return spring, seals and guides, air inlet and outlet ports and ventilation channels, and a connector / push rod.

[0003] Article 3.2.2.1 (2) of the "Railway Passenger Car Repair Regulations" (TG / CL 208-2022) and Articles 3.1.2.2 and 3.1.2.3 of Part 3 of the "CR200J Type Power Centralized EMU Repair Technical Regulations (D4 Repair)" (Tieji Lv

[2023] No. 8) respectively stipulate the standards for disassembling and repairing the uncoupling air cylinder under A3 and D4 repairs: 1. Disassemble the uncoupling air cylinder; 2. If there are cracks in the cylinder body or obvious damage to the inner wall and piston, replace it; 3. If the free height of the uncoupling air cylinder spring is less than 235mm or the corrosion depth is greater than 0.5mm, replace it; 4. If the uncoupling handle is bent and deformed, adjust it; 5. Apply grease to the cylinder body cavity, spring and fasteners; 6. If the round pin is in good condition, replace the cotter pin; 7. After the repair, conduct an action test, requiring the piston to reset flexibly.

[0004] Currently, there is a lack of dedicated fixing fixtures, spring compression fixtures, and manual testing fixtures for the disassembly and maintenance of uncoupling air cylinders in CR200J EMU (straight car) and 25T passenger cars. This results in low efficiency, potential occupational safety hazards, and difficulty in ensuring maintenance quality. There is an urgent need to design and manufacture a disassembly and maintenance fixture for uncoupling air cylinders to address the problems of lack of fixing and rotation mechanisms, spring compression mechanisms, and difficulties in rework after loading, thereby eliminating safety hazards and improving maintenance efficiency and quality. Utility Model Content

[0005] This utility model provides a tooling for disassembling and repairing a hook-out air cylinder. Through the limiting support plate and clamping parts, the hook-out air cylinder can be fixed when assembling and disassembling the cylinder body and cylinder head. Moreover, the pressure fork can press the return spring when disassembling the piston to prevent the return spring from suddenly popping out and injuring people. This solves the problems of difficult fixing and inconvenient spring assembly and disassembly mentioned in the background art.

[0006] This utility model provides the following technical solution: The disassembly and maintenance fixture for the unhooking air cylinder includes a base plate and two symmetrically distributed limiting support plates, the bottom of which is fixedly connected to the top of the base plate. The unhooking air cylinder is located between the two limiting support plates, and each limiting support plate is equipped with a clamping component for holding the unhooking air cylinder. A vertical plate is also included, the bottom of which is fixedly connected to the top of the base plate. The top of the base plate is fixedly connected to a limiting block for limiting the cylinder head of the unhooking air cylinder. A pressure fork is vertically connected to the vertical plate; when the piston is installed or removed, the pressure fork is used to press the return spring of the unhooking air cylinder.

[0007] As a preferred technical solution of this utility model, the clamping member consists of two sets of rotary plunger indexing pins. The two sets of rotary plunger indexing pins are respectively threaded to the limiting support plate. The pin rods of the two sets of rotary plunger indexing pins extend into the mounting holes on both sides of the unhooking air cylinder. When the pin rods of the two sets of rotary plunger indexing pins approach each other, the unhooking air cylinder is limited.

[0008] As a preferred technical solution of this utility model, a lower support seat is fixedly connected to the top of the base plate. The lower support seat is located between two limiting support plates. The lower support seat and the upper support seat are connected together by a thrust ball bearing. The bottom of the unhooking air cylinder can be placed inside the upper support seat.

[0009] As a preferred technical solution of this utility model, a through groove is provided on the upright plate, the pressure fork is slidably connected in the through groove, and one end of the pressure fork extends through the through groove to the top of the limiting block.

[0010] As a preferred technical solution of this utility model, the distance between the bottom end face of the through groove and the bottom end face of the upright plate is 235mm and there are engraved lines, which are used to quickly measure whether the free height of the spring exceeds the limit.

[0011] As a preferred technical solution of this utility model, a quick clamp is detachably connected to the upright plate. The clamping end of the quick clamp is threadedly connected to the other end of the pressure fork. When the quick clamp moves, the pressure fork rises or falls.

[0012] As a preferred technical solution of this utility model, the top of the limiting block is provided with a slot, and the connector of the unhooking air cylinder is engaged with the slot.

[0013] Compared with the prior art, the present invention provides a tooling for disassembling and repairing the air cylinder, which has the following beneficial effects: 1. In this disassembly and maintenance fixture for the unhooking air cylinder, the unhooking air cylinder can be quickly fixed by the limiting support plate and the indexing pin, which facilitates the disassembly and assembly of the cylinder head. Then, by using the spring compression mechanism such as the pressure fork, the return spring can be pressed when disassembling and assembling the piston, which prevents the return spring from suddenly popping out and injuring people, thus improving the safety of use.

[0014] 2. In this disassembly and maintenance fixture for the unhooked air cylinder, by utilizing readily available parts such as quick clamps and indexing pins, the overall structural complexity can be reduced while ensuring the effectiveness of use, and parts can be quickly replaced for convenient use.

[0015] The parts not covered in this device are the same as or can be implemented using existing technology. This utility model uses indexing pins to quickly fix the unhooking air cylinder, which facilitates the installation and removal of the cylinder cover and the fixing of the unhooking air cylinder during manual testing. Then, using spring compression mechanisms such as pressure forks, the return spring can be pressed when disassembling and assembling the piston to prevent the return spring from suddenly popping out and injuring people, thus improving safety. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0017] Figure 1 This is a first-person perspective perspective view of the present invention; Figure 2 This is a second-view perspective perspective view of the present invention; Figure 3 This is a three-dimensional view of the disassembled part of the present invention; Figure 4 This is a partial perspective view of the present invention.

[0018] In the diagram: 1. Base plate; 2. Vertical plate; 201. Through groove; 3. Lower support seat; 4. Upper support seat; 5. Limiting support plate; 6. Knob plunger indexing pin; 7. Limiting block; 701. Slot; 8. Quick clamp; 9. Pressure fork. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Reference Figures 1-4The disassembly and maintenance fixture for the unhooking air cylinder includes a base plate 1. In actual use, the base plate 1 can be fixed to the operating table using G-clamps to prevent movement and ensure optimal performance. It also includes two symmetrically distributed limiting support plates 5. The bottom of each limiting support plate 5 is fixedly connected to the top of the base plate 1. Each limiting support plate 5 has a long, strip-shaped plate structure, with one end of its long side fixed to the base plate 1 by welding or by bolts from the bottom of the base plate 1. Welding is preferred. The unhooking air cylinder is located between the two limiting support plates 5, and each limiting support plate 5 is equipped with clamping components for holding the unhooking air cylinder. These clamping components can be connected to the limiting support plate 5 by two hand-tightening bolts. The unhooking air cylinder is then held in place by rotating the hand-tightening bolts. The hook cylinder is used for clamping. Here, the clamping component is preferably two sets of knob plunger indexing pins 6. The knob plunger indexing pins 6 are existing technology, and the preferred model is GN617.1-M16-NI. The working process is as follows: the pin is usually in the protruding state; when the knob is pulled out, the pin retracts. If the pin is rotated 90° while it is still pulled out, it can be locked and placed in the retracted state; to release the locking state, simply rotate 90° while it is still pulled out; if the knob is released, the pin will return to the protruding state by the action of the built-in spring force.Two sets of rotary plunger indexing pins 6 are threadedly connected to the limiting support plate 5. The pins of the two sets of rotary plunger indexing pins 6 extend into the mounting holes on both sides of the unhooking air cylinder. When the pins of the two sets of rotary plunger indexing pins 6 approach each other, the unhooking air cylinder is limited. The bottom of the upright plate 2 is fixedly connected to the top of the base plate 1. The upright plate 2 is fixed to the bottom of the base plate 1 with bolts. Here, welding is preferred. A limiting block 7 for limiting the cylinder head of the unhooking air cylinder is fixedly connected to the top of the base plate 1. The limiting block 7 can be fixed with bolts. It is fixed to the base plate 1, or it can be fixed by welding. Here, welding is preferred. A slot 701 is provided on the top of the limiting block 7. The top of the slot 701 is open. A first inclined surface is fixedly connected to the inner wall. The connector of the unhooking air cylinder has a U-shaped structure. A second inclined surface matching the first inclined surface is fixedly connected inside the connector. When the connector is placed on the limiting block 7, the second inclined surface abuts against the first inclined surface, realizing the engagement connection between the connector of the unhooking air cylinder and the slot 701. The thickness of the limiting block 7 and the inner wall of the U-shaped structure are also fixedly connected. Corresponding to the wall, it can prevent the cylinder head assembly from tipping over. A pressure fork 9 is raised and lowered on the upright plate 2. One end of the pressure fork 9 has a U-shaped clearance groove to avoid the fixing bolts on the piston, which facilitates its installation and removal. When installing or removing the piston, the pressure fork 9 is used to press the return spring of the unhooking air cylinder. In use, the unhooking air cylinder is placed between the two limit support plates 5, and the pins of the two sets of knob plunger indexing pins 6 extend into the mounting holes on both sides of the unhooking air cylinder to fix it. Then the cylinder head assembly can be removed from the cylinder body. Then the unhooking air cylinder can be removed from the cylinder body. The lower cylinder head assembly is placed on the limiting block 7, with the piston at the top. The connector engages with the limiting block 7. Finally, the pressure fork 9 is driven to slide downwards to press the piston and maintain the pressed state. At this point, the piston can be removed from the piston rod. After disassembly, the pressure fork 9 slowly rises until the return spring is in a free state. Then, the return spring is removed, and its length is quickly measured through the 235mm graduation line in the free state to determine if it exceeds the limit and to observe for corrosion or other problems. After all checks are completed, the unhooking air cylinder is assembled in reverse order. During installation, the upper cylinder head and return spring are first placed on the piston rod. Then, the piston rod connector is placed upside down on the limiting block 7. The pressure fork 9 is then driven to move downwards to press the piston, compressing the return spring. During this process, to facilitate the smooth insertion of the piston inner hole into the piston rod end screw, a 120mm long, 13mm outer diameter, and 0.5mm wall thickness stainless steel hollow tube is used as a guide tube for auxiliary alignment. Finally, assemble the flat washer, spring washer, and nut in sequence and tighten the fixing nut. Use quick clamp 8 to place the pressure fork 9 at the top, remove the piston assembly, apply grease, and align it with the cylinder body. Tighten the mounting bolts diagonally in sequence, and finally install the unhooking handle, connecting pin, and cotter pin.

[0021] A lower support seat 3 is fixedly connected to the top of the base plate 1. The lower support seat 3 can be fixed from the bottom of the base plate 1 using bolts, or preferably by welding. The lower support seat 3 is located between the two limiting support plates 5. The lower support seat 3 and the upper support seat 4 are connected by a bearing, preferably a thrust ball bearing. During assembly and disassembly, the bottom of the unhooking air cylinder is located inside the upper support seat 4, cooperating with the two sets of rotary plunger indexing pins 6 to achieve a fixing effect. According to the operator's habits, the indexing pins can be retracted during this process to achieve 360° free rotation.

[0022] A through groove 201 is provided on the upright plate 2. The pressure fork 9 is slidably connected in the through groove 201, and one end of the pressure fork 9 extends through the through groove 201 to the top of the limit block 7, which facilitates pressing the reset spring and the piston and reduces the occurrence of the reset spring suddenly popping out.

[0023] The bottom end face of the through groove 201 is designed to be 235mm away from the bottom end face of the vertical plate 2 and has a scribed line. At this time, the axis of the removed reset spring can be placed vertically next to the vertical plate 2 to facilitate quick measurement of the free height of the reset spring to determine whether it exceeds the limit.

[0024] A quick clamp 8 is detachably connected to the upright plate 2 via screws. The quick clamp 8 is a push-pull type quick clamp 8, preferably model ZJ201C. The clamping end of the quick clamp 8 is detachably connected to the other end of the pressure fork 9, also using bolts. When the quick clamp 8 moves, the pressure fork 9 rises or falls. In use, the pressure fork 9 is raised or lowered by turning the handle of the quick clamp 8. It is convenient to use, and the quick clamp 8 with a suitable displacement distance can be selected according to the actual application. It utilizes the mechanical four-bar dead point principle and adopts a purely mechanical labor-saving structure. It does not require an additional air source or power supply and has strong environmental adaptability.

[0025] In this invention, during use, first pull the plunger-type indexing pin handle outward and rotate it to retract the indexing pin. Place the unhooking air cylinder to be disassembled on the upper support 4, insert the indexing pin into the unhooking air cylinder mounting hole, and use tools such as snap ring pliers and a hammer to remove the cotter pin on the mounting pin. Remove the mounting pin and the unhooking handle. Then, use a wrench to remove the six mounting bolts on the cylinder head. Depending on the operator's habits, this process can retract the indexing pin. Then, rotate the cylinder head to drive the upper support 4, achieving 360° free rotation to disassemble the mounting bolts. Remove the piston assembly and the air cylinder cover together, rotate it 180°, and place the piston rod mounting pin seat (connector) in the slot 701 of the limit block 7. Then, place the U-shaped pressure fork 9 of the spring compression mechanism at the bottom and lock it. Use a wrench to remove the M16 nut on the top of the piston. Then, unlock the U-shaped pressure fork 9 and slowly raise it to the top. At this time, the various components of the piston assembly can be removed for visual inspection. The free height of the spring can be quickly measured using the 235mm engraving on the side of the spring compression mechanism (side of the upright plate 2). After the parts are inspected, the unhooking cylinder is assembled in reverse order. Before assembling the piston nut of the unhooking cylinder, a guide tube is used to facilitate the alignment between the piston inner hole and the piston rod. Then, the spring is compressed to the installation height and locked using the U-shaped pressure fork 9. Before manual testing, the indexing pin needs to be extended into the mounting hole of the unhooking cylinder. Then, the unhooking handle is manually pulled to its full stroke or the minimum stroke required for unhooking (at least 100mm). If the stroke is stuck or the minimum stroke for unhooking cannot be reached, it needs to be disassembled and inspected again.

[0026] Components not described in detail in this article are existing technologies.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A disassembly and maintenance fixture for the unhooking air cylinder, including a base plate (1), characterized in that, Also includes: Two symmetrically distributed limiting support plates (5) are fixedly connected to the top of the bottom plate (1) at their bottom. The unhooking air cylinder is located between the two limiting support plates (5), and each limiting support plate (5) is equipped with a clamping component for clamping the unhooking air cylinder. The bottom of the upright plate (2) is fixedly connected to the top of the base plate (1). The bottom plate (1) is fixedly connected to a limiting block (7) for limiting the cylinder head of the unhooking air cylinder, and the upright plate (2) is connected to a pressure fork (9) for lifting and lowering. When the piston is installed or removed, the pressure fork (9) is used to press the reset spring of the unhooking air cylinder.

2. The disassembly and maintenance fixture for the unhooking air cylinder according to claim 1, characterized in that, The clamping component consists of two sets of rotary plunger indexing pins (6). The two sets of rotary plunger indexing pins (6) are threadedly connected to the limiting support plate (5). The pin rods of the two sets of rotary plunger indexing pins (6) extend into the mounting holes on both sides of the unhooking air cylinder. When the pin rods of the two sets of rotary plunger indexing pins (6) approach each other, the unhooking air cylinder is limited.

3. The disassembly and repair fixture for the unhooking air cylinder according to claim 1, characterized in that, The bottom plate (1) is fixedly connected to the top of the lower support seat (3), which is located between the two limiting support plates (5). The lower support seat (3) and the upper support seat (4) are connected together by a thrust ball bearing. The bottom of the unhooking air cylinder can be placed in the upper support seat (4).

4. The disassembly and repair fixture for the unhooking air cylinder according to claim 1, characterized in that, The upright plate (2) has a through groove (201), the pressure fork (9) is slidably connected in the through groove (201), and one end of the pressure fork (9) extends through the through groove (201) to the top of the limiting block (7).

5. The disassembly and maintenance fixture for the unhooking air cylinder according to claim 4, characterized in that, The bottom end face of the through groove (201) is 235mm away from the bottom end face of the vertical plate (2) and has a etched line, which is used to quickly measure whether the free height of the spring exceeds the limit.

6. The disassembly and maintenance fixture for the unhooking air cylinder according to claim 1, characterized in that, A quick clamp (8) is detachably connected to the upright plate (2). The clamping end of the quick clamp (8) is threadedly connected to the other end of the pressure fork (9). When the quick clamp (8) moves, the pressure fork (9) rises or falls.

7. The disassembly and maintenance fixture for the unhooking air cylinder according to claim 1, characterized in that, The top of the limiting block (7) is provided with a slot (701), and the connector of the unhooking air cylinder is engaged with the slot (701).

Images