A pipe expanding and constricting two-in-one tool

Abstract

This utility model provides a combined expander and tightener tool, belonging to the field of hydraulic tools. It solves the problem of complex structure in existing integrated expander and tightener methods. This combined expander and tightener tool includes a cylinder body, inside which are housed an expander, a sliding sleeve tightener, and a rotating shaft. The cylinder body can rotate around the rotating shaft. A reversing valve body is fixedly connected to the lower end of the cylinder body. The reversing valve body integrates a reversing valve core and a valve seat for mounting the reversing valve core. One end of the rotating shaft is fixed to the cylinder body, and the other end extends into the reversing valve body and is drively connected to the reversing valve core. The rotating shaft has independent first and second oil passages, respectively connecting the expander and the sliding sleeve tightener. A cylinder connecting shaft is provided on the valve seat, and the cylinder connecting shaft has an internal oil passage communicating with the reversing valve core. The reversing valve body has a reversing positioning mechanism for locking the conduction position of the reversing valve core. This utility model has the advantages of simple structure and quick switching.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic tools, and specifically relates to a tool that combines expanding and tightening pipes. Background Technology

[0002] The function of a pipe expander is to squeeze and enlarge one end of a pipe fitting, which can expand the opening of the pipe fitting. The function of a tightening tool is to smoothly fit a sliding sleeve into the enlarged end of the pipe fitting. The combination of the two facilitates the tight connection of the pipe fittings.

[0003] If you try to integrate the two functions into one tool, the core challenge is how to reliably and efficiently switch the hydraulic circuits to drive the expander and the sleeve tightener separately. Alternatively, traditional integration solutions may rely on multiple external directional valves or additional switching devices, resulting in a large and bulky overall structure that increases operational complexity. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a tool that combines tube expansion and tightening in one step, thereby solving these problems.

[0005] The objective of this utility model can be achieved through the following technical solution: A tool combining pipe expansion and tightening, comprising a cylinder body, wherein a pipe expander, a sliding sleeve tightener, and a rotating shaft are provided inside the cylinder body, and the cylinder body can rotate around the rotating shaft. The tool is characterized in that a reversing valve body is fixedly connected to the lower end of the cylinder body, and a reversing valve core and a valve seat for mounting the reversing valve core are integrated inside the reversing valve body. One end of the rotating shaft is fixed to the cylinder body, and the other end extends into the reversing valve body and is drively connected to the reversing valve core. The rotating shaft has independent first and second oil passages inside, which are respectively connected to the pipe expander and the sliding sleeve tightener. A cylinder connecting shaft is provided on the valve seat, and the cylinder connecting shaft has an internal oil passage communicating with the reversing valve core. The reversing valve body is provided with a reversing positioning mechanism for locking the conduction position of the reversing valve core.

[0006] In the above-mentioned two-in-one tool for expanding and tightening pipes, the reversing positioning mechanism includes a spring and a reversing positioning steel ball disposed in the reversing valve body. The outer end of the cylinder body is provided with a groove that matches the steel ball, and the cylinder body position is locked by the steel ball being inserted into the groove.

[0007] In the above-mentioned tool that combines expanding and tightening pipes, the connection end between the rotating shaft and the reversing valve core is provided with a reversing rotating shaft bearing, which is used to support the rotation of the rotating shaft and reduce frictional resistance.

[0008] In the above-mentioned tool that combines expanding and tightening of pipes, oil pipe plugs are provided at the outlet ends of the first and second oil pipes, and each plug is sealed with the oil pipe hole by a conical surface seal or a threaded seal.

[0009] In the above-mentioned tool that combines expanding and tightening of pipes, the cylinder connecting shaft and the valve seat are integrally formed, and the outer end of the cylinder is provided with a standard hydraulic interface for connecting external oil pipes.

[0010] In the above-mentioned two-in-one tool for expanding and tightening pipes, the expander includes an expanding cylinder and the sliding sleeve tightener includes a tightening cylinder. The two are coaxially arranged inside the cylinder body and are respectively connected to the first oil circuit and the second oil circuit.

[0011] Compared with existing technologies, this two-in-one tool for expanding and tightening pipes can quickly switch between expanding and tightening modes by rotating the cylinder. This improves efficiency by several times compared with traditional tool disassembly and replacement methods, greatly reducing downtime and making it especially suitable for frequent alternation of working conditions. The dual oil circuit built-in rotating shaft integrates transmission and hydraulics, reducing the volume by 40%. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural diagram of the combined expansion and tightening tool.

[0013] Figure 2 This is a partially enlarged structural diagram of the combined tube expander and tightener tool.

[0014] In the diagram, 1. Cylinder body; 2. Expander; 3. Slip sleeve tightener; 4. Rotating shaft; 5. Reversing valve body; 6. Reversing valve core; 7. Valve seat; 8. First oil passage; 9. Second oil passage; 10. Cylinder connecting shaft; 11. Spring; 12. Steel ball; 13. Groove; 14. Bearing; 15. Oil passage plug. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1 , Figure 2 As shown, this combined expander and tightener tool includes a cylinder body 1. Inside the cylinder body 1 are a expander 2, a sliding sleeve tightener 3, and a rotating shaft 4. The cylinder body 1 can rotate around the rotating shaft 4. A reversing valve body 5 is fixedly connected to the lower end of the cylinder body 1. The reversing valve body 5 integrates a reversing valve core 6 and a valve seat 7 for mounting the reversing valve core 6. One end of the rotating shaft 4 is fixed to the cylinder body 1, and the other end extends into the reversing valve body 5 and is connected to the reversing valve core 6. The rotating shaft 4 has an independent first oil passage 8 and a second oil passage 9 inside, which are respectively connected to the expander 2 and the sliding sleeve tightener 3. The valve seat 7 is provided with a cylinder connecting shaft 10. The cylinder connecting shaft 10 has an internal oil passage that communicates with the reversing valve core 6. The reversing valve body 5 is provided with a reversing positioning mechanism for locking the conduction position of the reversing valve core 6.

[0017] The reversing positioning mechanism includes a spring 11 and a reversing positioning steel ball 12 housed within the reversing valve body 5. A groove 13 matching the steel ball 12 is provided at the outer end of the cylinder body 1. The position of the cylinder body 1 is locked by the steel ball 12 engaging with the groove 13. A reversing rotating shaft 4 bearing 14 is provided at the connection end between the rotating shaft 4 and the reversing valve core 6 to support the rotation of the rotating shaft 4 and reduce frictional resistance. Oil passage plugs 15 are provided at the outlet ends of both the first oil passage 8 and the second oil passage 9. Each plug and oil passage hole are sealed with a conical surface seal or a threaded seal. The cylinder connecting shaft 10 is integrally formed with the valve seat 7, and its outer end is provided with a standard hydraulic interface for connecting external oil pipes. The expander 2 includes an expanding cylinder, and the sliding sleeve tightener 3 includes a sliding tightening cylinder. Both are coaxially arranged inside the cylinder body 1 and are respectively connected to the first oil passage 8 and the second oil passage 9.

[0018] Working principle

[0019] The cylinder body 1 rotates 180°, causing the rotating shaft 4 fixed to the cylinder body 1 to rotate synchronously. The end of the rotating shaft 4 drives the reversing valve core 6 to move axially within the valve seat 7. When the cylinder body 1 moves to the target position, the reversing positioning steel ball 12 is engaged in the groove 13 of the cylinder body 1 under the action of the spring 11, realizing the mechanical locking of the position of the cylinder body 1. The reversing valve core 6 connects to the cylinder connecting shaft 10 and the first oil passage 8, allowing its hydraulic oil to enter the expander cylinder and drive the expander 2 to work.

[0020] The reversing valve core 6, through the oil cylinder connecting shaft 10 and the second oil circuit 9, allows hydraulic oil to enter the sliding cylinder to drive the sliding sleeve tightener 3 to work.

[0021] The outlet of the expansion pipe oil passage connected to the first oil passage 8 is equipped with a plug for the expansion pipe oil passage machining hole, and the outlet of the second oil passage 9 is equipped with a plug for the oil passage machining hole of the reversing shaft 4. High-pressure oil leakage is prevented by tapered surface or threaded seal. The cylinder connecting shaft 10 is integrally formed with the valve seat 7, and its internal oil passage is directly connected to the reversing valve core 6, reducing external pipelines and lowering the risk of leakage.

[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0023] Although this document uses a considerable amount of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A combined expander and tightener tool, comprising a cylinder (1), wherein the cylinder (1) is provided with a expander (2), a sliding sleeve tightener (3), and a rotating shaft (4), the cylinder (1) being rotatable about the rotating shaft (4), characterized in that, The lower end of the cylinder body (1) is fixedly connected to a reversing valve body (5). The reversing valve body (5) integrates a reversing valve core (6) and a valve seat (7) for installing the reversing valve core (6). One end of the rotating shaft (4) is fixed on the cylinder body (1), and the other end extends into the reversing valve body (5) and is connected to the reversing valve core (6) in a transmission. The rotating shaft (4) has an independent first oil passage (8) and a second oil passage (9) inside, which are respectively connected to the expander (2) and the sliding sleeve tightener (3). The valve seat (7) is provided with a cylinder connecting shaft (10). The cylinder connecting shaft (10) has an internal oil passage that is connected to the reversing valve core (6). The reversing valve body (5) is provided with a reversing positioning mechanism for locking the conduction position of the reversing valve core (6).

2. The tube expanding and tightening combined tool according to claim 1, characterized in that, The reversing positioning mechanism includes a spring and a reversing positioning steel ball (12) provided in the reversing valve body (5). The outer end of the cylinder body (1) is provided with a groove (13) that matches the steel ball (12). The position of the cylinder body (1) is locked by the steel ball (12) being inserted into the groove (13).

3. The tube expanding and tightening combined tool according to claim 1, characterized in that, The connection end between the rotating shaft (4) and the reversing valve core (6) is provided with a reversing rotating shaft (4) bearing (14) to support the rotation of the rotating shaft (4) and reduce frictional resistance.

4. The tube expanding and tightening combined tool according to claim 1, characterized in that, Oil plugs (15) are provided at the outlet ends of the first oil passage (8) and the second oil passage (9). Each plug and oil passage hole are sealed with a conical surface or a threaded seal.

5. The tube expanding and tightening combined tool according to claim 1, characterized in that, The cylinder connecting shaft (10) and valve seat (7) are integrally formed, and a standard hydraulic interface is provided at its outer end for connecting external oil pipes.

6. The tube expanding and tightening combined tool according to claim 1, characterized in that, The expander (2) includes an expander cylinder, and the sleeve tightener (3) includes a sleeve tightening cylinder. The two are coaxially arranged inside the cylinder body (1) and are respectively connected to the first oil passage (8) and the second oil passage (9).

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