Cylinder welding positioning tool
The cylinder welding positioning tool with internal tensioning utilizes a clamping jaw tensioning and return spring structure to solve the problem of frequent clamping and loosening required by existing tools, enabling convenient replacement of the cylinder welding position and improving welding efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGCHUN YIDONG AUTOMOBILE SPARE PART MFG CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-07-14
AI Technical Summary
Existing cylinder welding positioning tools require frequent loosening and clamping when changing welding positions, which is cumbersome and affects welding efficiency.
A cylinder welding positioning tool with internal expansion tension was designed. The tool uses grippers to hold the cylinder by tension, and combined with a return spring and a limiting structure, it can rotate and change the welding position without releasing the tool.
It simplifies the process of changing the welding position of the cylinder barrel, and improves welding efficiency and ease of operation.
Smart Images
Figure CN224488107U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of auxiliary processing tools technology. Background Technology
[0002] Cylinder barrel welding is a critical process in hydraulic cylinder manufacturing, directly affecting the cylinder's sealing performance, strength, and durability. The cylinder barrel itself is cylindrical, and the welding area requires a circular perimeter. Therefore, during welding, the position needs to be changed along this circle. Due to the nature of welding work, the cylinder barrel cannot be held by hand. Therefore, a positioning tool is needed to hold and position the cylinder barrel. Existing clamping (holding, positioning, etc.) tools hold the cylinder barrel, and after welding one position, the clamping tool needs to be released, rotated, and then the clamping position changed before welding the next position, and so on. This operation is relatively cumbersome. Summary of the Invention
[0003] The purpose of this invention is to design a cylinder welding positioning tool that, based on the shape of the cylinder, holds it in a tightening manner from its inner hole and does not require loosening the holding state when changing positions during welding.
[0004] The front end of the connecting shaft of this utility model is equipped with a bearing via a snap ring. A bearing mounting seat is fitted over the bearing. The base of the connecting component is fixedly mounted on the bearing mounting seat. The top post of the connecting component is inserted into the positioning seat. The upper end of the top post of the connecting component is a tapered slope. A limiting groove is opened on the side of the top post of the connecting component. A positioning pin passes through the front end of the positioning seat and is placed in the limiting groove. A claw groove is opened on the upper surface of the positioning seat. The claw is installed in the claw groove via a shaft pin. The inner side of the claw is an inner tapered slope corresponding to the tapered slope of the top post of the connecting component. A return spring is fitted between the positioning seat and the base of the connecting component.
[0005] This invention features a gripper return spring between the outer end of the gripper in the gripper groove and the positioning seat.
[0006] The structure of this utility model is designed to fit the inner groove of the cylinder and uses a gripper to expand and hold the cylinder through tension. It is simple to operate and easy to use. When changing the welding position, it is not necessary to loosen the tool itself; simply rotating the tool itself is enough to change the welding position of the workpiece (cylinder). Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0008] Figure 2 This is a utility model Figure 1 A cross-sectional view of AA, and a schematic diagram of the loosened state;
[0009] Figure 3 This is a utility model Figure 1A cross-sectional view of AA, and a schematic diagram of the tensioned state;
[0010] Figure 4 This is an exploded view of the front end of this utility model;
[0011] Figure 5 This is a utility model Figure 1 The left view;
[0012] Figure 6 This is a schematic diagram of the connection method between the connector and the positioning pin of this utility model. Detailed Implementation
[0013] The front end of the connecting shaft 5 of this utility model is equipped with a bearing 6 via a retaining spring 12. A bearing mounting seat 4 is fitted over the bearing 6. The base of the connecting piece 3 is fixedly installed on the bearing mounting seat 4. The top post of the connecting piece 3 is inserted into the positioning seat 1. The upper end of the top post of the connecting piece 3 is a tapered slope. A limiting groove 7 is opened on the side of the top post of the connecting piece 3. A positioning pin 8 passes through the front end of the positioning seat 1 and is placed in the limiting groove 7. A claw groove 15 is opened on the upper surface of the positioning seat 1. A claw 10 is installed in the claw groove 15 via a shaft pin 9. The inner side of the claw 10 is an inner tapered slope corresponding to the tapered slope of the top post of the connecting piece 3. A return spring 2 is fitted between the positioning seat 1 and the base of the connecting piece 3.
[0014] See the attached diagram. Connecting shaft 5 is a cylinder, and its tail end ( Figure 1 ----- Figure 3 The right end of the connecting shaft 5 is connected to the piston rod of the cylinder (hydraulic cylinder, etc.). The extension and retraction of the piston rod pushes or retracts the connecting shaft 5, which can serve as the fixed shaft for the front-end component (that is, the bearing mounting base 4, carrying the front-end assembly, can rotate around the connecting shaft 5). Figure 2 and Figure 3 As can be seen, the connecting shaft 5 and the bearing mounting base 4 are connected by the bearing 6.
[0015] A connector 3 is installed on the bearing mounting base 4 by bolts (or other fixing methods such as rivets). The connector 3 consists of two parts: one is the connector base installed on the bearing mounting base 4, and the other is a cylindrical top post on the base of the connector 3. The top of the top post is shaped like a truncated cone, so that its front end forms a cone.
[0016] An axial groove (limiting groove 7) is opened on the side of the top column. At the same time, a pin hole is opened in the positioning seat 1. After the positioning pin 8 passes through this pin hole, its front end is placed in the axial groove. Through this structure, the positioning seat 1 is fitted onto the connector 3, and the axial movement distance of the connector 3 is limited. As long as the truncated cone at the top of the connector 3 protrudes, it is sufficient.
[0017] See Figure 4 Three gripper grooves 15 are provided on the surface of the positioning seat 1. The positions of the three grooves are in the form of three equal parts of the circular surface. A shaft hole 14 is opened on the side wall of the gripper groove 15.
[0018] See Figure 4 Since there are three gripper grooves 15, there are also three grippers 10. The gripper 10 is divided into upper and lower sections. The lower section has a pin hole 13. The upper section is higher than the upper edge of the gripper groove 15. The lower section is basically matched with the shape of the gripper groove 15. That is to say, the lower section of the gripper 10 is completely placed inside the gripper groove 15, while the upper section is placed outside the gripper groove 15.
[0019] After the pin 9 passes through the shaft hole 14 and the pin hole 13, its tail end is secured by a snap ring. Thus, the pin 9 is both a pin, used to restrict the movement of the gripper 10 relative to the positioning seat 1, and a shaft, which allows the gripper 10 to rotate relative to the positioning seat 1.
[0020] Three grippers 10 form a circle, creating a circular hole in the middle. To accommodate the truncated cone at the top of the connecting shaft 5, the circular hole they form is designed as an inverted truncated cone hole, meaning that the inner side of each gripper 10 is an inner conical slope.
[0021] This utility model has a gripper return spring 11 between the outer end of the gripper 10 in the gripper groove 15 and the positioning seat 1. See Figure 2 , Figure 3 As can be seen, after welding is completed, the gripper 10 needs to be reset. Therefore, an auxiliary reset spring (gripper reset spring 11) is added to increase the force for the gripper 10 to rotate and reset.
[0022] Work process:
[0023] Tightening work: During work, see Figure 2 In the released state, the cylinder X is placed on the gripper 10. Under the action of the cylinder, the entire utility model moves forward, so that the front end of the gripper 10 enters the cylinder X and presses against the cylinder X. Then, the positioning seat 1 and the gripper 10 stop linear movement, but the cylinder does not stop working. Therefore, the connecting shaft 5 continues to press against the bearing mounting seat 4 and the connecting piece 3 to move forward. At the same time, the pull spring 2 is compressed. At this time, the truncated cone at the top of the connecting piece 3 presses the inner conical inclined surface of the gripper 10, so that it rotates about the shaft pin 9 as the axis. In this way, the outer apex of the three grippers 10 will tighten and fix the cylinder X in the form of external tension. At this time, the cylinder remains extended, which can always keep the cylinder X fastened to the end of the gripper 10. Then, the first point is welded. When a second weld needs to be replaced, simply rotate (either manually or with the help of other auxiliary tools) the bearing mounting seat 4 and the connecting piece 3, and the cylinder X will also rotate, so that the welding position corresponds to the welding gun, and perform the second weld. Repeat this process until all welding parts of the cylinder X are completed.
[0024] Release operation: After welding is completed, the cylinder retracts, causing the entire tool of this utility model to move backward. Figure 1 , Figure 2 , Figure 3 (To the right) First, the connecting shaft 5 moves backward with the bearing mounting seat 4 and the connecting piece 3, while the pull-back spring 2 extends. When the positioning pin 8 reaches the upper limit of the limit slide groove 7, the top column of the connecting piece 3 will pull the positioning seat 1 and the gripper 10 backward until the top corner of the gripper 10 disengages from the tension on the cylinder X and disengages from the cylinder X, thus completing the disassembly.
[0025] from Figure 2 and Figure 3 As can be seen, when the gripper 10 is rotating to reset (during the release process), a gripper reset spring 11 is provided to ensure that the gripper 10 is completely disengaged during reset.
Claims
1. A cylinder welding positioning tool, characterized in that: A bearing (6) is installed at the front end of the connecting shaft (5) via a snap ring (12). A bearing mounting seat (4) is fitted over the bearing (6). The base of the connecting piece (3) is fixedly installed on the bearing mounting seat (4). The top post of the connecting piece (3) is inserted into the positioning seat (1). The upper end of the top post of the connecting piece (3) is a tapered slope. A limiting groove (7) is opened on the side of the top post of the connecting piece (3). The positioning pin (8) passes through the front end of the positioning seat (1) and is placed in the limiting groove (7). A claw groove (15) is opened on the upper surface of the positioning seat (1). The claw (10) is installed in the claw groove (15) via a shaft pin (9). The inner side of the claw (10) is an inner tapered slope corresponding to the tapered slope of the top post of the connecting piece (3). A return spring (2) is fitted between the positioning seat (1) and the base of the connecting piece (3).
2. The cylinder welding positioning tool according to claim 1, characterized in that: There is a gripper return spring (11) between the outer end of the gripper (10) in the gripper groove (15) and the positioning seat (1).