Gas expansion device, throat machining method of expansion pipe and application

Abstract

The invention discloses a gas expansion device and a necking processing method and application of an expansion tube. The expansion device includes an expansion tube and an inflatable ignition head. The method is to fix the expansion tube through the clamp first, then rotate the expansion tube and heat the end of the expansion tube through the clamp, heat the end of the expansion tube until it is close to or reach plastic deformation, and after the front part of the shrinking mold touches the end of the expansion tube, The end of the expansion pipe moves from the front to the rear of the shrinking die, and the shrinking die extrudes and thickens the end of the expansion pipe, and the end of the shrinking end is thickened axially outward, and then the end of the expansion pipe is processed with a through-hole knife. Through-hole fixed aperture. The expansion tube is made into a pressure vessel by shrinking. The utility model has the advantages of simple structure, easy processing of structural components, low manufacturing cost, no flying head, no air leakage, safe transportation, no hidden danger of squib, and large expansion force.

Description

Technical field [0001] The invention belongs to the technical field of expansion devices, and in particular relates to a gas expansion device and a necking processing method and application of an expansion tube. Background technique [0002] Existing gas expansion devices (fracturing devices) are hereinafter referred to as expansion devices such as: CN201611099345.2, CN201520283079.3, CN201510489513.8, CN201510556527.7. The connection part usually adopts the threaded method (threads need to be machined) or welding or butt welding. For connection, no matter which method is used for manufacturing, the connection parts of the inflation head, the energy venting head and the expansion tube will all have weak points, which will cause the connection part of the expansion device to crack first when the expansion device is inflated, resulting in flying heads. [0003] The existing expansion device (fracturing device) also has the technical problems of many components and complicated process...

AI Technical Summary

Problems solved by technology

[0002] The existing gas expansion device (cracking device) is hereinafter referred to as the expansion device, such as: CN201611099345.2, CN201520283079.3, CN201510489513.8, CN201510556527.7 The connection part usually adopts the thread method (the thread needs to be machined) or the welding method or the butt welding method For connection, no matter which of the above methods is used for manufacturing, there will be weak points in the connection between the inflation head, the energy release head and the expansion tube, which will cause the connection part to crack first when the expansion device expands, and the flying head will appear.

[0003] The existing expansion device (fracturing device) still has many components, and the technical problems of complex processing and assembly processes for each component

[0004] For example, the patent document with the notification number CN205858345U discloses "plug, expansion tube, activator, liquid filling hole and lock valve, the plug is provided with an activator installation port, and the plug or expansion tube is provided with a liquid filling hole." ", although it saves a lot of parts and assembly steps compared with other expansion devices, there are still two processings at both ends of the expansion tube, that is, one end needs to be welded during assembly, and the other end needs to be threaded and sealed, or both ends are connected by welding. The welding master's technical level is extremely high. Less than 20% of the joints are welded with a constant thickness and no gaps. Thread processing, the two ends of the expansion tube after thread processing are weaker than the unprocessed tube body, so that there is a whole circle of weak points in the connection between the plug and the expansion tube, because there are stress weak points in the connection, and the use of plugs (full When the plug (filling head or discharge head) is threaded, the diameter of the plug (filling head or energy-discharging head) is slightly smaller than the diameter of the expansion tube body, resulting in a large force-bearing surface of the plug, large volume, and heavy weight. When the expansion device expands, the connection part will first Cracks and flying heads

[0008] Regardless of whether the gas cracking device in the prior art uses an activator, the lead wire needs to be connected to the expansion tube, and the lead wire needs to be sealed under high pressure, which directly leads to the shortage of large volume and heavy weight of the filling head.

[0009] The existing necking process uses rollers for necking, which is not easy to achieve uniform thickness. If it is used for mass production of expansion tubes, it will produce a high defective rate

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