A gas-protected mouthpiece

Abstract

The present invention discloses a gas-protected joint device, which relates to the technical field of pipeline construction equipment, including a joint device body, a joint device body, a gas storage tank fixedly arranged on the joint device body, two symmetrically arranged tightening and docking mechanisms arranged on the joint device body, a retractable cushion system also arranged on the joint device body, an annular closed air bag fixedly arranged on both sides of the tightening and docking mechanism, the closed air bag is connected to the gas storage tank, a control valve is arranged on the joint device body, the control valve is located between the two closed air bags and is connected to the outside of the joint device body; an auxiliary air bag is arranged between the two closed air bags, an air inlet valve and an air outlet valve are arranged on the auxiliary air bag, the air inlet valve is connected to the gas storage tank, and the air outlet valve is connected to the outside of the joint device body. The present invention provides a gas-protected joint device with high concentration of protective gas during welding, which is practical and convenient and reduces production costs.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline construction equipment, in particular to a gas-protected joint device. Background Art

[0002] The gas-protected jointer is mainly used in the construction of composite pipes composed of carbon steel and stainless steel. It generates radial force from the inside of the steel pipe to quickly align the two pipe ends to be assembled to meet the requirements of pipeline welding. It is a machine that uses compressed air as the power source for operation and control. The gas-protected jointer has the function of matching and providing inert gas protection. After the gas-protected jointer is used to complete the pipe assembly during construction, gas replacement is performed. During the welding process, inert gas is used to ensure that the stainless steel lining is not oxidized.

[0003] The invention patent with the existing authorization announcement number CN104097020B discloses an internal butt welding machine head for composite pipe construction, which is mainly suitable for butt welding in the construction of composite pipes with inner lining layers. The internal butt welding machine head is provided with two airbag trays and airbags are arranged on the airbag trays. Under the action of compressed air, the two airbags are respectively inflated and attached to the inner walls of the two sections of the pipe, and together with the two trays, form a cavity for containing protective gas.

[0004] By adopting the above technical solution, during welding, the shielding gas is filled into the cavity formed by the airbag, so that a stable shielding gas atmosphere is formed inside the pipe, thereby improving the welding quality. The process of filling the shielding gas into the cavity is equivalent to the process of using the shielding gas to drive the air out of the cavity and finally allowing the shielding gas to occupy the cavity. This method easily causes air to be mixed in the shielding gas, resulting in failure to achieve the expected welding quality. If the amount of shielding gas introduced is increased, more shielding gas will be used, resulting in higher costs. Summary of the invention

[0005] The purpose of the present invention is to provide a gas-shielded joint device, which utilizes two closed air bags to form a closed space at the pipe joint, and before the pipe welding, the auxiliary air bag is inflated to discharge the air in the closed space, and then the protective gas is filled in to ensure that the protective gas can reach the standard concentration as soon as possible, thereby improving construction efficiency, reducing construction costs, and being easy to use.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] An air-protected joint device, comprising a joint device body, a gas storage tank fixedly arranged on the joint device body, two symmetrically arranged tightening and docking mechanisms arranged on the joint device body, a retractable cushion system arranged on the joint device body, an annular closed air bag fixedly arranged on both sides of the tightening and docking mechanisms, the closed air bag being connected to the gas storage tank, a control valve arranged on the joint device body, the control valve being located between the two closed air bags and being connected to the outside of the joint device body;

[0008] An auxiliary air bag is arranged between the two closed air bags, and an air inlet valve and an air outlet valve are arranged on the auxiliary air bag. The air inlet valve is connected to the air storage tank, and the air outlet valve is connected to the outside of the mouthpiece body. An air protection valve is also arranged between the two closed air bags, and the air protection valve is connected to the protective gas.

[0009] By adopting the above technical solution, when it is necessary to dock the pipelines, the ends of the two pipelines are tightened and fixed by the tightening docking mechanism, and then the joints of the pipelines are blocked by the cushion system, and then the closed airbag is inflated to expand the closed airbag, and a closed space is formed between the two closed airbags. Then the air inlet valve is opened to inflate the auxiliary airbag, and the control valve is opened at the same time. The auxiliary airbag will fill the closed space during the inflation process to discharge the air in the closed space through the control valve. Finally, the gas protection valve is opened to fill the closed space with protective gas, and the control valve is closed and the air outlet valve is opened so that the air in the auxiliary airbag can be discharged when the protective gas is filled. After the above process, the protective gas finally filled into the closed space contains less air, and the concentration of the protective gas can be quickly increased to the standard value, thereby improving the construction efficiency, and this method can effectively reduce the waste of protective gas and reduce the construction cost.

[0010] The present invention is further configured as follows: the tightening docking mechanism includes a tightening cylinder, the piston rod end of the tightening cylinder is fixedly connected to the docking device body, a connecting rod is hingedly arranged on the cylinder body of the tightening cylinder, and a push rod is hingedly arranged on the end of the connecting rod away from the tightening cylinder, the push rod is slidingly matched with the docking device body, and an expansion block is fixedly arranged on the end of the push rod away from the connecting rod; the gasket system includes a sliding rod fixed on the expansion block, a gasket block is arranged on the sliding rod, and the gasket block is formed with inclined surfaces on both sides of the circumference of the docking device body, and the directions of the gasket blocks in the two tightening docking mechanisms are opposite, the inclined surface of the gasket block in one of the tightening docking mechanisms faces the docking device body, and the inclined surface of the gasket block in the other tightening docking mechanism faces away from the docking device body, and the curvature of the side of the gasket block away from the docking device body is the same as the curvature of the inner side of the pipe.

[0011] By adopting the above technical solution, when the piston rod of the tightening cylinder moves along the axis of the main body of the adapter, the connecting rod will convert the movement of the piston rod of the tightening cylinder into the movement of the push rod. When the push rod moves away from the tightening cylinder, it will push the expansion block to abut against the inner wall of the pipe to tighten the pipe. When in use, first use a tightening docking device to tighten the fixed pipe, then put the movable pipe on the adapter body and adjust the position, and then use another tightening docking device to tighten the movable pipe. While the expansion block tightens the pipe, the gasket block also abuts against the pipe joint to ensure that the inner side of the pipe can be forced to form during welding, and the gasket block can help dissipate heat at the weld to avoid heat concentration at the weld and affect the quality of the weld. After the expansion block is fully expanded, the gasket block can fit against the inner wall of the pipe to ensure the sealing of the pipe joint, which is conducive to maintaining the concentration of the protective gas.

[0012] The present invention is further configured as follows: a sliding hole is provided on the gasket block, the sliding rod slides in cooperation with the sliding hole, a limiting block is fixed at one end of the sliding rod away from the expansion block, a first spring is fixedly connected between the gasket block and the expansion block, the gasket block is a trapezoidal structure with the large end facing the corresponding expansion block.

[0013] By adopting the above technical solution, when the expansion block is fully expanded, the gasket block reaches the farthest distance from the corresponding expansion block under the action of the first spring, and when the expansion block contracts, the gasket block will slide towards the corresponding expansion block under the action of squeezing. This method can still ensure that all gasket blocks can abut against the pipeline when the diameter of the pipeline deviates, thereby ensuring the effectiveness of the gasket.

[0014] The present invention is further configured as follows: an abutment piece is slidably arranged in the sliding hole, the abutment piece is located on the side of the sliding rod away from the coupling device body, and a second spring is fixedly connected between the side of the abutment piece away from the sliding rod and the side wall of the sliding hole.

[0015] By adopting the above technical solution, the second spring can provide a stable abutment force between the gasket block and the inner wall of the pipe, ensuring that the expansion block effectively tightens the inner wall of the pipe while the gasket block and the inner wall of the pipe can also be effectively abutted, ensuring the gasket block's effect on weld forming and also ensuring the sealing effect on the joint.

[0016] The present invention is further configured as follows: a plurality of rollers are rotatably arranged on the expansion block, and the axial direction of the rollers is parallel to the axial direction of the main body of the mouthpiece.

[0017] By adopting the above technical solution, since the inner wall of the pipe is an arc-shaped structure and the mouthpiece body has a large deadweight, the expansion block will rub against the inner wall of the pipe during the process of tightening the pipe. The roller can reduce the friction between the expansion block and the pipe, thereby improving the tightening effect of the expansion block on the pipe.

[0018] The present invention is further configured as follows: the auxiliary airbag includes two parts, both parts are semi-annular structures, and the two parts are detachably connected.

[0019] By adopting the above technical solution, when installing the auxiliary airbag, it is only necessary to buckle the two parts onto the main body of the adapter, which makes disassembly and assembly convenient.

[0020] The present invention is further configured as follows: each of the split bodies includes a flexible airbag body and a rigid ventilation bin, the airbag body and the ventilation bin are fixedly connected and the ventilation bin is located on the inner side, and the ventilation bin is provided with a plurality of ventilation holes connecting the ventilation bin and the airbag body.

[0021] By adopting the above technical solution, after the two pipes are connected, the protective gas is introduced between the two closed airbags. At this time, the auxiliary airbag will discharge the internal air under the pressure of the protective gas. After the air is discharged, the airbag body will become deflated and attached to the ventilation bin. The ventilation holes on the ventilation bin can ensure that the air in the airbag body is completely discharged. The above technical solution can prevent the airbag body from clogging the air outlet valve during the process of discharging air, effectively improving the reliability of the air protection mouthpiece.

[0022] In summary, the beneficial technical effects of the present invention are:

[0023] (1) The present invention uses two closed air bags to form a closed space at the joint of the pipeline to accommodate the protective gas and ensure the concentration of the protective gas, and uses an auxiliary air bag to discharge the air in the closed space, so that the protective gas can quickly reach the standard concentration, the construction efficiency is high, and the waste of protective gas is small;

[0024] (2) The auxiliary airbag in the present invention includes two parts, which are easy to disassemble and assemble. Each part includes an airbag body and a vent chamber. When the airbag body discharges air, the vent chamber can always ensure connectivity with the airbag body, thereby ensuring that the air in the airbag body is completely discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0026] Figure 2 It is a cross-sectional view along the midline of an embodiment of the present invention, mainly showing the structure of the bracing and docking mechanism;

[0027] Figure 3 yes Figure 2 The enlarged view of the part at A in the middle mainly shows the structure of the liner system;

[0028] Figure 4 It is a structural schematic diagram of the liner block in the present invention;

[0029] Figure 5 It is an exploded view of the auxiliary airbag in the present invention.

[0030] Figure numerals: 1. docking device body; 2. air storage tank; 3. tightening cylinder; 4. connecting rod; 5. push rod; 6. expansion block; 7. roller; 8. slide rod; 9. cushion block; 10. inclined plane; 11. sliding hole; 12. limit block; 13. first spring; 14. abutment plate; 15. second spring; 16. closed airbag; 17. auxiliary airbag; 171. split; 1711. airbag body; 1712. ventilation chamber; 18. bolt hole; 19. control valve; 20. inlet valve; 21. outlet valve; 22. air protection valve; 23. ventilation hole. DETAILED DESCRIPTION

[0031] The present invention will be described clearly and completely below with reference to the embodiments.

[0032] See attached Figure 1 and attached Figure 2 A gas-protected joint device includes a joint device body 1, a gas storage tank 2 is fixedly arranged on the joint device body 1, and two symmetrically arranged tightening and docking mechanisms are arranged on the joint device body 1, and the tightening and docking mechanisms include a tightening cylinder 3, and the tightening cylinder 3 is connected with the gas storage tank 2 and driven by the compressed gas in the gas storage tank 2. The piston rod end of the tightening cylinder 3 is fixedly connected to the joint device body 1, and a connecting rod 4 is hingedly arranged on the cylinder body of the tightening cylinder 3, and a push rod 5 is hingedly arranged on the end of the connecting rod 4 away from the tightening cylinder 3, and the push rod 5 is slidably matched with the joint device body 1 and slides along the radial direction of the joint device body 1, and a swelling block 6 is fixedly arranged on the end of the push rod 5 away from the connecting rod 4. A plurality of rollers 7 are rotatably arranged on the swelling block 6, and the axial direction of the roller 7 is parallel to the axial direction of the joint device body 1.

[0033] Also includes a padding system, combined with attached Figure 3 The pad system includes a slide bar 8 fixed on the expansion block 6, and a pad block 9 is arranged on the slide bar 8. Figure 4The gasket block 9 is a trapezoidal structure with the large end facing the corresponding expansion block 6. The gasket block 9 is formed with inclined surfaces 10 on both sides of the circumferential direction of the adapter body 1. The directions of the gasket blocks 9 in the two tightening docking mechanisms are opposite. The inclined surface 10 on the gasket block 9 in one of the tightening docking mechanisms faces the adapter body 1, and the inclined surface 10 on the gasket block 9 in the other tightening docking mechanism faces away from the adapter body 1. The curvature of the side of the gasket block 9 away from the adapter body 1 is the same as the curvature of the inner side of the pipe. A sliding hole 11 is provided on the gasket block 9, and the slide rod 8 slides with the sliding hole 11. A limit block 12 is fixed on the end of the slide rod 8 away from the expansion block 6, and a first spring 13 is fixedly connected between the gasket block 9 and the expansion block 6. An abutment piece 14 is slidably provided in the sliding hole 11 . The abutment piece 14 is located on the side of the sliding rod 8 away from the coupling device body 1 . A second spring 15 is fixedly connected between the side of the abutment piece 14 away from the sliding rod 8 and the side wall of the sliding hole 11 .

[0034] See attached Figure 5 Combined with the attached Figure 2 , annular closed air bags 16 are fixedly arranged on both sides of the tightening docking mechanism, the closed air bags 16 are connected to the air storage tank 2, and a control valve 19 is arranged on the docking device body 1, the control valve 19 is located between the two closed air bags 16 and is connected to the outside of the docking device body 1.

[0035] An auxiliary airbag 17 is arranged between the two closed airbags 16. The auxiliary airbag 17 includes two split bodies 171. Both of the two split bodies 171 are semi-annular structures. Bolt holes 18 are formed at the ends of the two split bodies 171. When in use, the two split bodies 171 are fixedly connected to the mouthpiece body 1 by bolts. Each split body 171 includes a flexible airbag body 1711 and a rigid ventilation bin 1712. The airbag body 1711 and the ventilation bin 1712 are fixedly connected and the ventilation bin 1712 is located on the inner side. The ventilation bin 1712 is provided with a plurality of ventilation holes 23 connecting the ventilation bin 1712 and the airbag body 1711. The ventilation bin 1712 is provided with an air inlet valve 20 and an air outlet valve 21. The air inlet valve 20 is connected to the air storage tank 2, and the air outlet valve 21 is connected to the outside of the mouthpiece body 1. A gas protection valve 22 is also provided between the two closed air bags 16 , and the gas protection valve 22 is in communication with the protective gas.

[0036] The working principle of this embodiment is: when in use, the mouthpiece body 1 is inserted into the end of the fixed pipe, and then one of the tightening docking mechanisms is used to tighten the fixed pipe, and then the movable pipe is sleeved onto the mouthpiece body 1 and adjusted in position, and then the movable pipe is tightened by another tightening docking mechanism. In this process, the corresponding pad block 9 on the expansion block 6 will synchronously abut against the joint of the pipe, so that the joint of the pipe is closed. After that, the closed airbag 16 is inflated with the gas in the gas tank 2 to form a closed space between the two closed airbags 16, and then the air inlet valve 20 and the control valve 19 are opened, and the auxiliary airbag 17 is filled with the gas in the gas tank 2. In this process, the auxiliary airbag 17 will expand and discharge the air in the closed space. Finally, the air inlet valve 20 and the control valve 19 are closed, and the gas protection valve 22 and the air outlet valve 21 are opened. At this time, the protective gas will enter the closed space through the gas protection valve 22, and squeeze the auxiliary airbag 17 to discharge the gas in the auxiliary airbag 17. In this embodiment, when the protective gas is introduced into the space between the two closed air bags 16, there is no excess air in the space, so the protective gas will not be diluted, thereby being able to quickly reach the required concentration, with high construction efficiency, less waste of protective gas, and low construction cost.

[0037] The above description is only a preferred specific implementation manner of the present invention, and is not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air-protected mouthpiece, comprising a mouthpiece body (1), characterized in that: The mouthpiece body (1) is provided with a gas storage tank (2) fixedly mounted on the mouthpiece body (1), two symmetrically arranged tightening and docking mechanisms are arranged on the mouthpiece body (1), a retractable cushion system is also arranged on the mouthpiece body (1), an annular closed air bag (16) is fixedly mounted on both sides of the tightening and docking mechanisms, the closed air bag (16) is communicated with the gas storage tank (2), and a control valve (19) is arranged on the mouthpiece body (1), the control valve (19) is located between the two closed air bags (16) and is communicated with the outside of the mouthpiece body (1); An auxiliary air bag (17) is arranged between the two closed air bags (16); an air inlet valve (20) and an air outlet valve (21) are arranged on the auxiliary air bag (17); the air inlet valve (20) is communicated with the air storage tank (2); the air outlet valve (21) is communicated with the outside of the mouthpiece body (1); and an air protection valve (22) is also arranged between the two closed air bags (16); the air protection valve (22) is communicated with the protective gas; The tightening docking mechanism comprises a tightening cylinder (3), the piston rod end of the tightening cylinder (3) is fixedly connected to the docking device body (1), a connecting rod (4) is hingedly provided on the cylinder body of the tightening cylinder (3), a push rod (5) is hingedly provided at one end of the connecting rod (4) away from the tightening cylinder (3), the push rod (5) is slidably matched with the docking device body (1), and an expansion block (6) is fixedly provided at one end of the push rod (5) away from the connecting rod (4); the liner system comprises a sliding rod (8) fixed on the expansion block (6), A gasket block (9) is provided on the slide bar (8), and the gasket block (9) is formed with inclined surfaces (10) on both sides of the circumferential direction of the joint body (1). The directions of the gasket blocks (9) in the two tightening and docking mechanisms are opposite, and the inclined surface (10) on the gasket block (9) in one of the tightening and docking mechanisms faces the joint body (1), and the inclined surface (10) on the gasket block (9) in the other tightening and docking mechanism faces away from the joint body (1). The curvature of the side of the gasket block (9) away from the joint body (1) is the same as the curvature of the inner side of the pipe. The cushion block (9) is provided with a sliding hole (11), the sliding rod (8) is slidingly matched with the sliding hole (11), the end of the sliding rod (8) away from the expansion block (6) is fixed with a limiting block (12), a first spring (13) is fixedly connected between the cushion block (9) and the expansion block (6), and the cushion block (9) is a trapezoidal structure with the large end facing the corresponding expansion block (6); An abutment sheet (14) is also slidably arranged in the sliding hole (11), and the abutment sheet (14) is located on a side of the sliding rod (8) away from the coupling device body (1), and a second spring (15) is fixedly connected between the side of the abutment sheet (14) away from the sliding rod (8) and the side wall of the sliding hole (11); A plurality of rollers (7) are rotatably arranged on the expansion block (6), and the axial direction of the rollers (7) is parallel to the axial direction of the coupling device body (1).

2. The air-protected joint according to claim 1, characterized in that: The auxiliary airbag (17) comprises two split bodies (171), both of which are semi-annular structures, and the two split bodies (171) are detachably connected.

3. The air-protected joint device according to claim 2, characterized in that: Each of the split bodies (171) comprises a flexible airbag body (1711) and a rigid ventilation chamber (1712); the airbag body (1711) and the ventilation chamber (1712) are fixedly connected and the ventilation chamber (1712) is located on the inner side; and the ventilation chamber (1712) is provided with a plurality of ventilation holes (23) connecting the ventilation chamber (1712) and the airbag body (1711).

Images