CN207656117U - A kind of air inflation protecting device for welding of pipeline - Google Patents

Abstract

The utility model relates to the technical field of welding equipment, in particular to an inflatable protection device for pipeline welding. In order to solve the problems of large gas consumption and long inflation time when the full filling method is used for inflatable protection, the utility model discloses an inflatable protection device for pipeline welding. The inflatable protective device includes two airbags, a T-shaped pipe and an air intake pipe; wherein, the T-shaped pipe is located between the two airbags and communicates the two airbags; one end of the air intake pipe is connected to the The airbag is connected, and the other end is used as a free end for connecting the air source. The pipeline welding inflatable protection device of the utility model can not only reduce the usage amount of the protective gas and reduce the inflation cost, but also can reduce the inflation time and improve the inflation efficiency.

Description

A pipeline welding inflatable protective device

technical field

The utility model relates to the technical field of welding equipment, in particular to an inflatable protection device for pipeline welding.

Background technique

With the continuous development of petroleum, nuclear power, chemical industry and other industrial fields, the demand for pipeline welding is increasing, and the requirements for welding quality are becoming more and more stringent. For the welding of most pipelines, the quality of the root welding is particularly important. Usually, the back filling of argon is used to protect the weld metal, thereby ensuring the quality of the entire welded joint.

At present, the full filling method is generally used for argon filling protection, that is, the inner cavity of the pipe to be welded is filled with argon gas. However, since the effect of argon filling in this way depends on the size of the inner cavity of the pipeline, the quality of the final welding protection is not stable. When the pipeline is short and the inner cavity is small, the argon concentration distribution is uniform, and the protective effect of argon filling is remarkable; when the pipeline is long and the inner cavity is large, the argon concentration distribution is uneven, and the protective effect of argon filling will become poor, and this method In the protection mode of argon filling, the amount of argon used is large, the cost is high, the time of argon filling is long, and the efficiency is low.

Utility model content

In order to solve the problems of large gas consumption and long inflation time when the full filling method is used for inflatable protection, the utility model proposes an inflatable protection device for pipeline welding. The inflatable protective device includes two airbags, a T-shaped pipe and an air intake pipe; wherein, the T-shaped pipe is located between the two airbags and communicates the two airbags; one end of the air intake pipe is connected to the The air bag is connected, and the other end is connected with the air source.

Preferably, the airbag is provided with an exhaust port.

Further preferably, a vent plug is provided on the vent port, and a drawstring is provided on the vent plug.

Preferably, the two airbags are arranged concentrically.

Further preferably, the airbag adopts a cylindrical heat-resistant rubber airbag.

Further preferably, the T-shaped tube is located on the axis of the two airbags.

Preferably, the free end of the T-shaped pipe is provided with an air pressure control valve.

Further preferably, the free end of the air intake pipe is provided with a quick-plug joint.

Using the inflatable protection device for pipeline welding provided by the utility model, when the auxiliary pipeline is pair-welded, it has the following beneficial effects:

1. In this utility model, two airbags are used to seal the pipes to be welded on both sides of the group pair gap, thereby forming a local area surrounding the group pair gap, and then the protective gas is input to the local area through the T-shaped tube, In order to achieve the protection of welding. In this way, by precisely controlling the input area of the protective gas, not only can the usage of the protective gas be reduced and the cost can be reduced, but also the rushing speed of the protective gas can be accelerated and the inflation efficiency can be improved. In addition, it can also improve the stability of the shielding gas concentration during the welding process and improve the final welding quality.

2. In the utility model, by setting the air pressure control valve at the free end of the T-shaped tube, not only can the sequence of the protective gas input into different areas be controlled, that is, the expansion of the air bag is completed quickly to form an inflated area, and then the air bag is inflated. Inflation operation in the inflatable area, thereby reducing the leakage and waste of protective gas during the inflation process, maximizing the use efficiency of the protective gas, and the air pressure control valve can also keep the protective gas inside the airbag at a certain pressure, so that The air bag is always in a fully inflated state, maintaining stable contact with the inner wall of the pipe to be welded, improving the sealing of the shielding gas, thereby stabilizing the concentration of the shielding gas, and improving the final welding quality.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the pipeline welding inflatable protection device of the utility model in use.

Detailed ways

Below in conjunction with accompanying drawing, the technical solution of the utility model is introduced in detail.

As shown in FIG. 1 , the pipeline welding inflatable protective device of the present invention includes two airbags 1 , a T-shaped pipe 2 and an air intake pipe 3 . Wherein, the T-shaped tube 2 is located between the two airbags 1 and connects the inner cavities of the two airbags 1 to form a whole. One end of the air intake pipe 3 is connected to one of the airbags 1, and the other end is used as a free end for connecting to an air source.

At this time, when using the pipeline welding inflatable protection device of the present utility model, firstly, the device is placed inside the pipeline to be welded, and the two airbags 1 are respectively placed on both sides of the pair gap. Next, connect the free end of the air intake pipe 3 to the air source, and fill the two airbags 1 with protective gas through the T-shaped pipe 2 at the same time, so that the two airbags 1 are gradually inflated and supported on both sides of the paired gap, and then The free end of the T-piece 2 is closed in the central region. Then, the protective gas is poured into the middle area of the two airbags 1 through the air intake pipe 3, so as to realize precise inflation protection of the welding position.

Preferably, in the present utility model, two airbags 1 with the same external dimensions are selected, and the two airbags 1 are arranged concentrically. In this way, when the two airbags 1 are inflated, the synchronization of the expansion of the two airbags 1 and the contact with the inner wall of the pipe to be welded can be maintained, thereby ensuring the stability and smoothness of the contact process between the airbag 1 and the pipe to be welded .

Further preferably, the airbag 1 adopts a heat-resistant rubber airbag with a cylindrical structure, so as to ensure that the airbag 1 can have a certain width of sealing band between the inner wall of the pipe to be welded after it is fully inflated, and reduce the external leakage of the protective gas. The stability of the protective gas concentration between the airbags 1.

In addition, in the present utility model, the T-shaped tube 2 is fixed on the axes of the two airbags 1 . In this way, under the condition of ensuring that the two airbags 1 support the T-shaped tube 2 stably, the free end of the T-shaped tube 2 can be made as close as possible to the axial position of the pipe to be welded, so that the shielding gas output from the free end of the T-shaped tube 2 It can be dispersed evenly as soon as possible, improving the speed of the inflation process and the uniformity of protective gas dispersion.

Preferably, in the present utility model, an exhaust port 11 is provided on the end surface of the airbag 1 away from the gap between the pipe groups to be welded. Wherein, in the embodiment of this city, the exhaust port 11 is blocked by the exhaust plug 4, and at the same time, the exhaust plug 4 is provided with a stay cord 5. In this way, after completing the welding of the pipeline group and stopping the input of the protective gas, it is only necessary to pull the stay rope 5 to disengage the exhaust plug 4 and the exhaust port 11, and the discharge of the protective gas in the two airbags 1 can be completed, thereby The inflatable protection device of the present utility model is taken out.

In addition, in the present utility model, an air pressure control valve 6 can also be arranged at the free end of the T-shaped pipe 2 to control the opening of the free end of the T-shaped pipe 2 . In this way, during the inflation process of the airbags 1, the free end of the T-shaped tube 2 is closed by the air pressure control valve 6, so that all the input gas enters the inside of the two airbags 1, and the expansion speed of the two airbags 1 is increased. When the two airbags 1 are inflated and fully in contact with the inner wall of the pipe to be welded, as the protective gas continues to be input, the gas pressure inside the T-shaped tube 2 gradually increases until the air pressure control valve 6 is opened, so that the input at this time The protective gas all enters the area between the two airbags 1 .

In addition, the free end of the air intake pipe 3 can also be provided with a quick-plug connector 7 to facilitate the connection and disconnection of the air intake pipe 3, thereby increasing the connection speed between the air intake pipe 3 and the air source output pipe, and improving operating efficiency.

Claims (8)

1. An inflatable protection device for pipeline welding, characterized in that it comprises two air bags, a T-shaped pipe and an intake pipe; wherein the T-shaped pipe is located between the two air bags and communicates the two air bags ; One end of the air intake pipe is connected to the air bag, and the other end is used as a free end for connecting to an air source. 2. The inflatable protective device for pipeline welding according to claim 1, characterized in that, the air bag is provided with an exhaust port. 3. The inflatable protection device for pipeline welding according to claim 2, wherein an exhaust plug is provided on the exhaust port, and a drawstring is provided on the exhaust plug. 4. The inflatable protection device for pipeline welding according to claim 1, wherein the two airbags are concentrically arranged. 5. The inflatable protection device for pipeline welding according to claim 4, characterized in that the airbag is a heat-resistant rubber airbag with a cylindrical structure. 6 . The inflatable protection device for pipeline welding according to claim 5 , wherein the T-shaped pipe is located on the axis of the two airbags. 7 . 7. The inflatable protective device for pipeline welding according to any one of claims 1-6, characterized in that, the free end of the T-shaped pipe is provided with an air pressure control valve. 8. The inflatable protection device for pipeline welding according to claim 7, wherein the free end of the air inlet pipe is provided with a quick-plug joint.