Pneumatic tool for assembling all-welded ball valve

Abstract

A pneumatic tool for assembling all-welded ball valves comprises a rack, a first bearing seat is fixedly arranged on the rack, a first rotating clamping jaw is arranged in the first bearing seat, a positioning hole is formed in the end face of the first rotating clamping jaw, and a linear guide rail is arranged on the portion, on one side of the first bearing seat, of the rack. The linear guide rail is connected with a second bearing seat through a sliding block, a second rotating clamping jaw is arranged in the second bearing seat, an air cylinder is arranged on the machine frame, a piston rod of the air cylinder is connected with the second bearing seat, and the air cylinder is connected with an air source through an air pipe, a pneumatic valve and a precise pressure reducing valve. The first rotating clamping jaw and the second rotating clamping jaw are used for clamping the all-welded ball valve to be assembled, the air cylinder drives the second rotating clamping jaw to move, the second rotating clamping jaw and the first rotating clamping jaw press the all-welded ball valve to be assembled, the input pressure of compressed air of the air cylinder can be set through the precise pressure reducing valve according to the caliber and pressure of the valve, and the output force of the air cylinder is kept stable; and after the valve is welded and assembled, the yield is extremely high, and the production efficiency of the valve is improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a welding tooling, and especially to a pneumatic tooling for assembling a fully welded ball valve. Background Art

[0002] Fully welded ball valves are often used in thermal pipe networks, gas pipelines and water supply and drainage pipelines. Since the valve forming adopts welding technology, which involves high-temperature deformation and non-disassembly after welding, etc., it is required that the valve has good sealing performance and flexible opening after group welding. Therefore, the assembly technology requirements for fully welded ball valves are high. In the prior art, bolts are used to press the flange to control the overall length and pressing force of the valve, and it is done by the worker's feeling. In this way, the unqualified rate of the fully welded ball valve assembled by welding is high, and it is often necessary to cut the welding joint and rework, resulting in low production efficiency. Summary of the Invention

[0003] The purpose of the utility model is to provide a pneumatic tooling for assembling a fully welded ball valve, and the pneumatic tooling for assembling a fully welded ball valve is to solve the technical problems of low welding qualification rate and low production efficiency of fully welded ball valves in the prior art.

[0004] A pneumatic tooling for assembling a fully welded ball valve of the utility model includes a frame. A first bearing seat is fixedly arranged on the frame. A first rolling bearing is arranged in the first bearing seat. A first rotating jaw is arranged in the first rolling bearing. A positioning hole is arranged in the end face of the first rotating jaw. A linear guide rail is arranged on the frame on one side of the first bearing seat. A second bearing seat is connected to the linear guide rail through a slider. A second rolling bearing is arranged in the second bearing seat. A second rotating jaw is arranged in the second rolling bearing. The second rotating jaw is arranged opposite to the first rotating jaw. A cylinder is arranged on the frame. The piston rod of the cylinder is connected to the second bearing seat. The cylinder is connected to a gas source through an air pipe, a pneumatic valve and a precision pressure reducing valve.

[0005] Further, a bearing retaining plate is arranged on the first bearing seat on one side of the first rolling bearing.

[0006] Further, the piston rod of the cylinder is connected to the second bearing seat through a floating joint.

[0007] Further, a flow restrictor is arranged on the cylinder.

[0008] Compared with the prior art, the effects of the present utility model are positive and obvious. The first rotating jaw and the second rotating jaw are used to clamp the fully welded ball valve to be assembled. The air cylinder drives the second rotating jaw to move along the linear guide rail, and presses the fully welded ball valve to be assembled together with the first rotating jaw. According to the valve diameter and pressure, the sealing pressures of the sealing elements on both sides of the ball are different. Based on calculations and experience, the input pressure of the compressed air of the air cylinder is set by using a precision pressure reducing valve to keep the output force of the air cylinder stable, so as to control the pressing force of the fully welded ball valve to be assembled. After the valve is welded and assembled, the yield rate is extremely high, greatly improving the production efficiency of the valve; the precision pressure reducing valve can accurately set the pressure to meet the requirements of the pressing force for assembling the fully welded ball valve. Brief Description of the Drawings

[0009] Figure 1 It is a schematic diagram of a pneumatic tooling for assembling a fully welded ball valve of the present utility model.

[0010] Figure 2 It is a schematic diagram of the assembly structure of the fully welded ball valve. Detailed Embodiment

[0011] The present utility model will be further described below in conjunction with embodiments. However, the present utility model is not limited to these embodiments. Any similar structure and its similar changes using the present utility model shall be included in the protection scope of the present utility model. The use of directions such as up, down, front, back, left, and right in the present utility model is only for the convenience of clear description and does not limit the technical solution of the present utility model.

[0012] As Figure 1 shown, a pneumatic tooling for assembling a fully welded ball valve of the present utility model includes a frame 3. A first bearing seat 11 is fixedly arranged on the frame 3. A first rolling bearing 9 is arranged in the first bearing seat 11. A first rotating jaw 8 is arranged in the first rolling bearing 9. A positioning hole 12 is arranged in the end face of the first rotating jaw 8. A linear guide rail 5 is arranged on the frame 3 on one side of the first bearing seat 11. A second bearing seat 13 is connected to the linear guide rail 5 through a slider. A second rolling bearing 14 is arranged in the second bearing seat 13. A second rotating jaw 6 is arranged in the second rolling bearing 14. The second rotating jaw 6 is arranged opposite to the first rotating jaw 8. An air cylinder 2 is arranged on the frame 3. The piston rod of the air cylinder 2 is connected to the second bearing seat 13. The air cylinder 2 is connected to a gas source (not shown in the figure) through an air pipe (not shown in the figure), a pneumatic valve (not shown in the figure), and a precision pressure reducing valve (not shown in the figure).

[0013] Further, a bearing retaining plate 10 is arranged on the first bearing seat 11 on one side of the first rolling bearing 9.

[0014] Further, the piston rod of the air cylinder 2 is connected to the second bearing seat 13 through a floating joint 4.

[0015] Furthermore, a flow restrictor 1 is provided on the cylinder 2.

[0016] Specifically, the rolling bearing, rotating jaw, cylinder 2, pneumatic valve, precision pressure reducing valve, air source, bearing retainer 10, floating joint 4, flow restrictor 1, etc. in this embodiment all adopt well-known solutions in the prior art, which are already understood by those skilled in the art and will not be elaborated here.

[0017] The working principle of this embodiment:

[0018] As Figure 2 shown, the fully welded ball valve assembly structure includes a first inlet and outlet cylinder assembly 18, a second inlet and outlet cylinder assembly 15, a valve body 16, a ball 17, a valve stem 21, a bearing 19, a sealing ring 20, etc. Before the ball valve is welded and assembled, it can be divided into four parts: the first inlet and outlet cylinder assembly 18, the second inlet and outlet cylinder assembly 15, the valve body assembly, and the valve stem assembly.

[0019] 1) During operation, the first inlet and outlet cylinder assembly 18, the second inlet and outlet cylinder assembly 15, the valve body assembly, and the valve stem assembly are combined, and then the first inlet and outlet cylinder assembly 18 and the second inlet and outlet cylinder assembly 15 are respectively placed on the first rotating jaw 8 and the second rotating jaw 6, and clamped by the first rotating jaw 8 and the second rotating jaw 6. The cylinder 2 drives the second rotating jaw 6 to move along the linear guide 5 and presses the fully welded ball valve to be assembled together with the first rotating jaw 8. According to the valve diameter and pressure, and the sealing pressure of the sealing parts on both sides of the ball, and based on calculations and experience, the input pressure of the compressed air of the cylinder 2 is set by using the precision pressure reducing valve to keep the output force of the cylinder 2 stable, so as to control the pressing force of the fully welded ball valve to be assembled. After the valve is welded and assembled, the finished product rate is extremely high, greatly improving the production efficiency of the valve; the precision pressure reducing valve can accurately set the pressure to meet the requirements of the pressing force for assembling the fully welded ball valve.

[0020] 2) The first rotating jaw 8 and the second rotating jaw 6 are respectively fixed by the first rolling bearing 9 and the second rolling bearing 14, with flexible rotation, facilitating 360-degree rotation of the valve body to meet different welding positions and improving the working efficiency of welding; at the same time, the first rotating jaw 8 has a positioning hole 12, which is convenient for quickly positioning and fixing the assembled valve body and organizing mass production of the valve.

[0021] 3) The tooling control uses a pneumatic valve to manually control actions such as the start and stop of the tooling, meeting the requirements of overcoming welding high temperature and controlling explosion protection, and improving the safety of workers' operations.

Claims

1. A pneumatic tooling for assembling a fully welded ball valve, characterized in that: It includes a frame. A first bearing seat is fixedly arranged on the frame. A first rolling bearing is arranged in the first bearing seat. A first rotating jaw is arranged in the first rolling bearing. A positioning hole is arranged in the end face of the first rotating jaw. A linear guide rail is arranged on the frame on one side of the first bearing seat. A second bearing seat is connected to the linear guide rail through a slider. A second rolling bearing is arranged in the second bearing seat. A second rotating jaw is arranged in the second rolling bearing. The second rotating jaw is arranged facing the first rotating jaw. A cylinder is arranged on the frame. The piston rod of the cylinder is connected to the second bearing seat. The cylinder is connected to an air source through an air pipe, a pneumatic valve, and a precision pressure reducing valve.

2. The pneumatic tooling for assembling a fully welded ball valve according to claim 1, characterized in that: A bearing retaining plate is arranged on the first bearing seat on one side of the first rolling bearing.

3. The pneumatic tooling for assembling a fully welded ball valve according to claim 1, wherein: The piston rod of the cylinder is connected to the second bearing seat through a floating joint.

4. The pneumatic tooling for assembling a fully welded ball valve according to claim 1, characterized in that: A flow limiter is arranged on the cylinder.

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