Synchronous extrusion type welding gas protection plug

Abstract

The utility model belongs to the technical field of pipeline welding, and particularly relates to a synchronous extrusion type welding gas protection plug. The equipment comprises sealing plugs arranged on the two sides of a weld joint respectively, each sealing plug comprises two side plates and an elastic body arranged between the ends of the side plates, the two sealing plugs are communicated through a central shaft pipe with a shaft sleeve arranged outside, the outer end of the central shaft pipe is connected with a welding protection gas source, and an air inlet is formed in a middle pipe body; the central shaft pipe is connected with the side plates on the same sides of the two sealing plugs, the outer end of the central shaft pipe is connected with a push-pull mechanism, the central shaft pipe drives the side plates on the same sides of the two sealing plugs to move towards the side plates on the opposite sides, and then the elastic body is extruded to be tightly attached to the inner wall of the welding pipeline. The novel protection plug ensures tight plugging of two sides of a welding seam through synchronous extrusion, is balanced in pressure, and has the characteristics of small size, flexibility, convenience in operation, safety and stability.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline welding technology, specifically relating to a synchronous extrusion welding gas protective plug. Background Technology

[0002] Argon purging is required for the weld area during stainless steel pipe welding. However, existing argon purging plugging equipment (welding gas protection plugs) has various defects, posing significant challenges to welding gas protection. For example, sponge-type plugs do not provide a tight seal for argon gas, resulting in significant argon waste; rubber-made plugs are difficult to move inside the pipe due to strong friction with the pipe wall; and various airbag-type plugs are bulky, heavy, and prone to damage at high temperatures, leading to short service life and safety issues. Utility Model Content

[0003] The purpose of this invention is to provide a welding gas protection plug for welding stainless steel pipes. Through synchronous extrusion, it ensures that the plugs on both sides of the weld are tightly sealed and the pressure is balanced. It is small, convenient, easy to operate, safe and stable.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A synchronous extrusion type welding gas protective plug includes sealing plugs respectively placed on both sides of the weld. Each sealing plug includes two side plates and an elastic body placed between the ends of the side plates. The two sealing plugs are connected by a central shaft tube with a bushing on its outside. The outer end of the central shaft tube is connected to a welding protective gas source, and an air inlet is provided in the middle of the tube. The central shaft tube is connected to the same side plates of the two sealing plugs respectively. The outer end of the central shaft tube is connected to a push-pull mechanism, which causes the central shaft tube to drive the same side plates of the two sealing plugs to move towards the opposite side plates, thereby extruding the elastic body to make it fit tightly against the inner wall of the welding pipe.

[0006] Additional technical features constituting the above-mentioned synchronous extrusion welding gas shielding plug include:

[0007] —The push-pull mechanism is a power cylinder, the end of the telescopic rod of the power cylinder is connected to the central shaft tube, and the outer side plate of the sealing block is provided with a first through hole for the central shaft tube or the telescopic rod to pass through;

[0008] —The push-pull mechanism includes a tightening nut that is threaded to the outside of the central shaft tube. The tightening nut is located outside an outer side plate of the sealing plug. The side plate is provided with a second through hole through which the central shaft tube passes.

[0009] —The inner end of the central shaft tube passes through the outer side plate of another sealing plug and is positioned by tightening a nut. A sealing screw or pin is provided inside the inner end of the central shaft tube, and a pull ring is provided outside the sealing screw or pin.

[0010] —The two outermost side plates of the two sealing plugs are each fitted with pulleys by support feet, and the pulleys move in coordination with the inner wall of the welded pipe;

[0011] —A gas atomizing box is provided on the bushing, and the inner side of the gas atomizing box is connected to the air inlet of the central shaft tube. An exhaust hole is provided on the side plate of both sealing plugs.

[0012] —The elastomers are placed at the upper and lower ends of the sealing block side plate respectively. The elastomers are made of high-elastic rubber with a semi-circular spherical cross-section, and their two sides are connected to the ends of the left and right side plates of the sealing block respectively.

[0013] Compared with the prior art, the synchronous compression welding gas protective plug provided by this utility model has the following advantages: The two sealing plugs of the device are both composed of symmetrical side plates and an elastic body between them. A central shaft for conveying protective gas (argon) runs through the sealing plugs. The central shaft is connected to the side plates of the sealing plugs on the same side. In this way, after the central shaft is pulled by the push-pull mechanism, it ensures that the opposite side plates of each sealing plug compress the elastic body against each other, causing it to expand and fit tightly against the pipe wall. Since it is synchronous compression, the pressure of the two sealing plugs on the pipe wall is balanced, achieving the effect of stable positioning and tight sealing. This improves the utilization efficiency of welding protective gas, reduces welding production costs, and has the advantages of simple and compact structure, convenient use, safety and durability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a synchronous extrusion welding gas protective plug according to the present invention;

[0015] Figure 2 This is a schematic diagram of a synchronous extrusion welding gas protection plug with another push-pull mechanism. Detailed Implementation

[0016] The structure and working principle of the novel welding gas protective plug provided by this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] In the description of this utility model, unless otherwise stated, the terms "inner / outer" and "internal / external" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figure 1 As shown, the structure of this novel welding gas protective plug includes sealing plugs 1 placed on both sides of the weld. Each sealing plug 1 includes two side plates 11 and an elastic body 12 placed between the ends of the side plates 11. The two sealing plugs 1 are connected by a central shaft tube 22 with a bushing 21 on its outside. The outer end of the central shaft tube 22 is connected to a welding protective gas source 3, and an air inlet 41 is provided in the middle of the tube. The central shaft tube 22 is connected to the same side plate 51 of the two sealing plugs 1 respectively. The outer end of the central shaft tube 22 is connected to a push-pull mechanism, which causes the central shaft tube 22 to drive the same side plate 51 of the two sealing plugs 1 to move towards the opposite side plate 52, thereby squeezing the elastic body 12 to make it fit tightly against the inner wall of the welding pipe.

[0020] Its working principle is as follows: The two sealing plugs 1 of the device are placed on both sides of the weld, and the two are connected by a central shaft tube 22. The outer end of the central shaft tube 22 passes through the sealing plug 1 and is connected to the protective gas source 3. The central shaft tube 22 in the weld area has an air inlet 41 for delivering argon gas to the welding area. The central shaft tube 22 is connected to the side plate 51 on the same side of the two sealing plugs 1 respectively. When the central shaft tube 22 is pulled by the push-pull mechanism, one side plate of each sealing plug 1 moves to the side of its opposite side 52. The two squeeze each other, causing the elastic body 12 at the end to expand, and then tightly adhere to the tube wall to achieve sealing.

[0021] It should be noted that within the weld area, the central shaft tube 22 is fitted with a bushing 21, with its two ends abutting against the side plates of the two sealing plugs 1 to achieve synchronous extrusion; the outer end of the central shaft tube 22 is connected to the air source 3, while the inner end of the tube is connected to the side plate of each sealing plug 1 that is relatively far from the air source, so as to achieve synchronous directional movement.

[0022] In the structure constituting the above-mentioned welding gas protective plug

[0023] —In one embodiment, the push-pull mechanism is a power cylinder 61. The end of the telescopic rod 62 of the power cylinder 61 is connected to the central shaft tube 22. The outer side plate of the sealing plug 1 is provided with a first through hole 63 for the central shaft tube 22 or the telescopic rod to pass through. The power cylinder 61 can be a general hydraulic cylinder or a pneumatic cylinder. Its piston rod 62 realizes the telescopic function and is connected to the central shaft tube 22. The power cylinder 61 can also be a two-way pneumatic cylinder. Its telescopic rod 62 is a hollow tube. After docking with the central shaft tube 22, the outer side of the telescopic rod 62 can be directly connected to the protective air source 3. Figure 1 That is, a bidirectional telescopic cylinder is used.

[0024] --like Figure 2 As shown, in another embodiment, the push-pull mechanism includes a tightening nut 71 that is threaded to the outside of the central shaft tube 22. The tightening nut 71 is placed on the outside of the outer side plate of a sealing plug 1. The side plate is provided with a second through hole 72 through which the central shaft tube 22 passes. That is, by rotating the tightening nut 71, the central shaft tube 22 can move telescopically relative to the side plate of the sealing plug 1, which also serves the purpose of pushing and pulling the central shaft tube 22.

[0025] —Furthermore, the inner end of the aforementioned central shaft tube 22 penetrates the outer side plate of another sealing plug 1 and is positioned by tightening a nut 81. A sealing screw or pin 82 is provided inside the inner end of the central shaft tube 22, and a pull ring 83 is provided outside the sealing screw or pin 82. The inner end of the central shaft tube 22 is detachably connected to the sealing plug 1, which facilitates installation and disassembly. The pull ring 83 design improves ease of use and facilitates the entry of the entire device into the pipe weld area.

[0026] — Preferably, pulleys 92 are installed on the outer side plates of the two sealing plugs 1 via support feet 91. The pulleys 92 move in coordination with the inner wall of the welded pipe. The pulleys 92 facilitate the smooth dragging of the entire device inside the pipe, which is especially suitable for small-diameter pipes.

[0027] —Furthermore, a gas atomizing box 10 is provided on the aforementioned bushing 21. The inner side of the gas atomizing box 10 is connected to the air inlet 41 of the central shaft tube 22. Argon gas is atomized through the gas atomizing box and transported to the weld area to quickly form a protective gas, which improves the utilization efficiency of argon gas, saves the amount used, and forms an effective concentration. Both side plates of the two sealing plugs 1 are provided with exhaust holes 42. In the early stage of transportation, the air in the weld area of ​​the pipeline is replaced. The air is discharged through the exhaust holes 42 on the side plates or directly enters the sealing plug 1 (that is, no exhaust holes are provided on the opposite outer side plates of the two sealing plugs).

[0028] — Preferably, the above-mentioned elastomer 12 is placed at both ends of the side plate 11 of the sealing plug 1. It is a spherical surface with a semi-circular cross-section made of high elastic rubber. Its two sides are respectively connected to the ends of the two side plates 11 of the sealing plug 1. The side plates 11 press against each other to form a semi-circular spherical surface (shaped like half a tire). The spherical surface fits tightly with the curved surface of the pipe wall, and the sealing is reliable and tight. The high elastic rubber is made of high temperature resistant silicone rubber, which can withstand the influence of high welding temperature for a long time.

[0029] The above-described embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the implementation of this utility model. Therefore, any other modifications or equivalent substitutions to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A synchronous extrusion welding gas protective plug, comprising sealing plugs respectively placed on both sides of the weld, the sealing plugs comprising two side plates and an elastic body placed between the ends of the side plates, characterized in that: The two sealing plugs are connected by a central shaft tube with a bushing on its outside. The outer end of the central shaft tube is connected to a welding protective gas source, and an air inlet is provided in the middle of the tube. The central shaft tube is connected to the same side plate of the two sealing plugs respectively. The outer end of the central shaft tube is connected to a push-pull mechanism, which causes the central shaft tube to drive the same side plate of the two sealing plugs to move to the opposite side plate respectively, thereby squeezing the elastic body to make it fit tightly against the inner wall of the welded pipe.

2. The synchronous extrusion welding gas protective plug according to claim 1, characterized in that: The push-pull mechanism is a power cylinder, and the end of the telescopic rod of the power cylinder is connected to the central shaft tube. The outer side plate of the sealing block is provided with a first through hole for the central shaft tube or the telescopic rod to pass through.

3. The synchronous extrusion welding gas protective plug according to claim 1, characterized in that: The push-pull mechanism includes a tightening nut that is externally threaded to the central shaft tube. The tightening nut is located outside an outer side plate of the sealing plug, and the side plate is provided with a second through hole through which the central shaft tube passes.

4. The synchronous extrusion welding gas protective plug according to claim 1, characterized in that: The inner end of the central shaft tube passes through the outer side plate of another sealing plug and is positioned by tightening a nut. A sealing screw or pin is provided inside the inner end of the central shaft tube, and a pull ring is provided on the outside of the sealing screw or pin.

5. The synchronous extrusion welding gas protective plug according to claim 1, characterized in that: The two outermost side plates of the two sealing plugs are each fitted with pulleys via feet, and the pulleys move in conjunction with the inner wall of the welded pipe.

6. The synchronous extrusion welding gas protective plug according to claim 1, characterized in that: A gas atomizing box is provided on the bushing, and the inner side of the gas atomizing box is connected to the air inlet of the central shaft tube. An exhaust hole is provided on the side plate of both sealing plugs.

7. The synchronous extrusion welding gas protective plug according to claim 1, characterized in that: The elastomers are respectively placed at the upper and lower ends of the sealing block side plate. The elastomers are made of high-elastic rubber with a semi-circular spherical cross-section, and their two sides are respectively connected to the ends of the left and right side plates of the sealing block.

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