Automatic argon filling system for intelligent assembly welding of stainless steel pipeline and operation method of automatic argon filling system

Abstract

The invention discloses an automatic argon filling system for intelligent assembly welding of stainless steel pipelines and an operation method of the automatic argon filling system. The system comprises a pipe fitting sealing assembly, a pipe sealing assembly, a pipe fitting argon channel penetrating through the pipe fitting sealing assembly, a pipe fitting air return channel and a pipe fitting inflation channel. And the pipe fitting inflation channel communicates with the pipe sealing assembly, so that gas is fed into the pipe fitting inflation channel to inflate the pipe sealing assembly, and the pipe sealing assembly expands to block the second to-be-welded part. And the pipe fitting sealing assembly can be matched with the pipe sealing assembly, so that a sealing cavity is formed between the first to-be-welded part and the second to-be-welded part. Argon can enter the sealing cavity through the pipe fitting argon channel and fill the sealing cavity, and air in the sealing cavity can leave the sealing cavity through the pipe fitting air return channel. According to the system, the whole-course automatic operation of plugging, argon filling and argon concentration detection is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial pipeline prefabrication and processing equipment, and in particular to an automatic argon filling system for intelligent assembly welding of stainless steel pipelines and an operating method thereof. Background Art

[0002] In modern industrial infrastructure projects, the demand for intelligent pipeline prefabrication is becoming increasingly urgent, especially the demand for intelligent welding of stainless steel pipelines.

[0003] One of the important links in the intelligent welding of stainless steel pipes is to seal the inside of the weld formed by the group to form a sealed cavity, and then fill the sealed cavity with argon to displace the oxygen in the sealed cavity. After the argon concentration reaches a certain value, the base welding is carried out to avoid oxidation of the base weld surface, thereby ensuring the final welding quality.

[0004] There are two existing pipeline welding solutions:

[0005] In the first method, the operator places sealing plugs made of soluble paper inside the first and second parts to be welded (e.g., a pipe) and the second part to be welded (e.g., a straight pipe). After spot welding the first and second parts, the operator then seals the gap from the outside with soluble or plastic tape. This creates a sealed cavity between the first and second parts. The operator then inserts an argon gas line through the soluble or plastic tape into the sealed cavity to fill it with argon. When the argon concentration reaches a predetermined level, the operator can begin welding.

[0006] The second method involves placing a first sealing plug in the first workpiece and a second sealing plug in the second workpiece. The first and second sealing plugs are connected by a stainless steel cable. The operator then seals the gap from the outside with soluble or plastic tape. This creates a sealed cavity between the first and second workpieces. The operator then inserts an argon gas line through the soluble or plastic tape into the sealed cavity to fill it with argon. Once the argon concentration reaches a predetermined level, the operator can begin welding.

[0007] However, these existing technologies have many defects, for example, the entire process of sealing the inner sides of the first and second parts to be welded requires manual operation, the entire process of argon filling requires manual operation, and the detection of argon concentration requires manual operation.

[0008] These problems seriously affect the efficiency and quality of pipeline welding and restrict the further development of automated production lines. Therefore, developing a system that can meet the needs of pipeline intelligent welding has important practical significance and economic value.

[0009] Therefore, it is necessary to improve the prior art to overcome the above defects. Summary of the Invention

[0010] Based on this, it is necessary to provide an automatic argon filling system and an operating method thereof for intelligent assembly welding of stainless steel pipelines.

[0011] To solve the above technical problems, this application provides the following technical solutions:

[0012] An automatic argon filling system for intelligent welding of stainless steel pipelines, comprising:

[0013] A pipe sealing assembly, used for sealing the first part to be welded;

[0014] a pipe sealing assembly capable of expanding and sealing a second member to be welded; and

[0015] The pipe argon channel, the pipe return gas channel and the pipe inflation channel pass through the pipe sealing assembly;

[0016] The pipe inflation channel is in communication with the pipe sealing assembly, so that gas is fed into the pipe inflation channel to inflate the pipe sealing assembly, thereby causing the pipe sealing assembly to expand and seal the second part to be welded;

[0017] The pipe sealing assembly can cooperate with the tube sealing assembly to form a sealed cavity between the first part to be welded and the second part to be welded;

[0018] Argon gas can enter the sealed cavity through the argon gas passage of the pipe and fill the sealed cavity, and the air in the sealed cavity can leave the sealed cavity through the air return passage of the pipe.

[0019] Furthermore, on the pipe sealing assembly, the pipe argon channel is located below the pipe return gas channel.

[0020] Furthermore, the pipe sealing assembly includes an air expansion member, an air-shooting bullet, and an air-inflating hose;

[0021] The pipe inflation channel is connected to the gas expansion member through the air-shooting bullet and the inflation hose;

[0022] The gas expansion member is connected to the gas-fired bullet;

[0023] The air gun bullet is arranged in the argon gas channel of the pipe, so that when argon gas is filled into the argon gas channel of the pipe, the air gun bullet can be driven away from the argon gas channel of the pipe and the air expansion member can be driven into the second part to be welded.

[0024] Furthermore, the inflatable member is a balloon or a leather ball.

[0025] Furthermore, the air-jet bullet includes an air-jet bullet and an inflation elbow, the air-jet bullet and the inflation elbow are connected, the air-jet bullet can be inserted into the argon gas channel of the pipe, and the inflation elbow can connect the inflation hose and the gas expansion member.

[0026] Further, the pipe sealing assembly includes an air expansion member and a telescopic cylinder;

[0027] The gas expansion member is connected to the inflation channel of the pipe through the telescopic cylinder;

[0028] The gas enters the telescopic cylinder, thereby causing the telescopic cylinder to expand and push the gas expansion member into the second part to be welded, and inflate the gas expansion member.

[0029] Furthermore, the automatic argon filling system for intelligent welding of stainless steel pipes also includes:

[0030] The handpiece argon gas channel can be communicated with the argon gas channel of the pipe;

[0031] An argon gas filling valve is provided on the argon gas channel of the handpiece;

[0032] The handpiece air return channel can be communicated with the pipe air return channel;

[0033] The air-inflating channel of the handpiece can be communicated with the air-inflating channel of the pipe;

[0034] an air inflation valve, disposed on the air inflation channel of the handpiece; and

[0035] The argon gas detection device is installed on the return air channel of the machine head and is used to detect the argon gas content.

[0036] Furthermore, the automatic argon filling system for intelligent welding of stainless steel pipes also includes:

[0037] Head seal assembly, including:

[0038] A sealing plate, wherein the pipe argon channel, the pipe return channel, or the pipe charging channel is provided on the sealing plate;

[0039] A T-shaped tube is provided at the end of the argon gas channel of the pipe or the return gas channel of the handpiece or the charging channel of the handpiece;

[0040] seals; and

[0041] a spring, causing the T-shaped tube to have a force moving toward the sealing member;

[0042] When the sealing plate abuts against the sealing member, the spring can keep the T-shaped tube against the sealing member and the sealing member against the sealing plate, thereby sealing the connection between the argon gas channel of the handpiece and the argon gas channel of the pipe and / or sealing the connection between the return gas channel of the handpiece and the return gas channel of the pipe and / or sealing the connection between the inflation channel of the handpiece and the inflation channel of the pipe.

[0043] Furthermore, when the pipe module is released from the welding head, the seal 55 and the sealing plate 51 are separated, the pipe return air channel is disconnected from the head return air channel, the gas in the pipe sealing assembly is released through the pipe return air channel, and the volume of the pipe sealing assembly shrinks.

[0044] The present application also provides a method for operating the automatic argon filling system for intelligent welding of stainless steel pipes as described in any one of the above, comprising the following steps:

[0045] S1: placing the pipe sealing assembly in the first part to be welded, and placing the pipe sealing assembly in the second part to be welded;

[0046] S2: driving the pipe sealing assembly into the second part to be welded;

[0047] S3: sending gas into the inflation channel of the pipe to expand the pipe sealing assembly and seal the second part to be welded, thereby forming a sealed cavity in the first part to be welded and the second part to be welded;

[0048] S4: Argon gas can enter the sealed cavity through the argon gas channel of the pipe and fill the sealed cavity, and the air in the sealed cavity can leave the sealed cavity through the return gas channel of the pipe.

[0049] Compared to the prior art, the automatic argon filling system for intelligent stainless steel pipe welding disclosed in this application utilizes a pipe sealing assembly and a pipe fitting sealing assembly, and provides a pipe fitting argon channel, a pipe fitting return channel, and a pipe fitting inflation channel on the pipe fitting sealing assembly. This seals the cavity before welding and inflates the sealed cavity with argon, thereby achieving fully automated sealing and argon inflation. Furthermore, the automatic argon filling system for intelligent stainless steel pipe welding disclosed in this application also includes an argon gas detection device, thereby achieving fully automated argon gas concentration detection.

[0050] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0052] Figure 1 This is a partial structural diagram of the automatic argon filling system for intelligent welding of stainless steel pipes provided by this application;

[0053] Figure 2 yes Figure 1 A schematic structural diagram of an alternative embodiment;

[0054] Figure 3 This is a schematic diagram of an automatic argon filling system for intelligent welding of stainless steel pipes provided in this application;

[0055] Figure 4 yes Figure 3 Enlarged view of the middle part.

[0056] Description of labels:

[0057] Pipe module 1, pipe sealing assembly 10, pipe sealing assembly 11, gas expansion member 12, pipe argon channel 13, joint 131, pipe return air channel 14, pipe inflation channel 15, air-fired bullet 16, air-fired bullet 161, inflation elbow 162, inflation hose 17, telescopic cylinder 18, welding head 3, head argon channel 33, head return air channel 34, head inflation channel 35, argon inflation valve 41, air inflation valve 42, argon detection device 43, head sealing assembly 50, sealing plate 51, spring 52, T-tube 53, spring seat 54, seal 55 and rotating slip ring 60. DETAILED DESCRIPTION

[0058] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0059] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "first", "second" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0061] In this application, unless otherwise expressly specified or limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or that the first feature and the second feature are indirectly in contact through an intermediate medium. Furthermore, a first feature being “above,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0063] See also Figures 1 to 2The present invention provides an automatic argon filling system for intelligent assembly welding of stainless steel pipes, comprising: a pipe sealing assembly 11, a tube sealing assembly 10, a pipe argon channel 13, a pipe return channel 14 and a pipe inflation channel 15. The pipe sealing assembly 11 is used to seal the first part to be welded. The pipe sealing assembly 10 can expand and be used to seal the second part to be welded. The pipe argon channel 13, the pipe return channel 14 and the pipe inflation channel 15 pass through the pipe sealing assembly 11. In the present application, the parts of the pipe argon channel 13, the pipe return channel 14 and the pipe inflation channel 15 that pass through the pipe sealing assembly 11 are pipe joint components, which are convenient for connection with other components. The pipe inflation channel 15 is connected to the pipe sealing assembly 10, so that gas is sent into the pipe inflation channel 15 to inflate the pipe sealing assembly 10, so that the pipe sealing assembly 10 expands and seals the second part to be welded. The pipe sealing assembly 11 cooperates with the tube sealing assembly 10 to form a sealed cavity between the first and second welded parts. Argon gas can enter and fill the sealed cavity through the pipe argon gas passage 13, and air in the sealed cavity can exit through the pipe return gas passage 14. This allows the welding robot to automatically perform root welding operations.

[0064] Specifically, the pipe sealing assembly 11 is a sealing plug. The sealing plug is a roughly cylindrical sponge and two thin steel plates. The thin steel plates are placed on opposite sides of the sponge, and their outer diameters are smaller than the outer diameter of the sponge. This ensures that the outer edge of the sealing plug is flexible while retaining a certain degree of rigidity, ensuring that it does not damage the first part to be welded when inserted and remains securely in the first part. The sealing plug can be placed in the first part to be welded and seal it.

[0065] Specifically, on the pipe sealing assembly 11, the pipe argon gas channel 13 is located below the pipe return gas channel 14. In other words, when the pipe sealing assembly 11 is set in the first pipe to be welded, on the sealing plug, the pipe joint of the pipe argon gas channel 13 is located below the pipe joint of the pipe return gas channel 14. Therefore, when argon gas enters the sealed cavity through the pipe argon gas channel 13, the air in the sealed cavity can leave the sealed cavity through the pipe return gas channel 14. Since argon gas is denser than air, the arrangement of the pipe argon gas channel 13 below the pipe return gas channel 14 can reduce the disturbance of the air in the sealed cavity, thereby allowing the air to quickly leave the sealed cavity from the pipe return gas channel 14 located above.

[0066] See also Figure 2The pipe sealing assembly 10 of the present invention includes an air expansion member 12, an air gun bullet 16, and an air hose 17. The pipe inflation passage 15 communicates with the air expansion member 12 via the air gun bullet 16 and the air hose 17. The air expansion member 12 is connected to the air gun bullet 16. The air gun bullet 16 is disposed within the pipe argon passage 13, such that when argon gas is introduced into the pipe argon passage 13, the air gun bullet 16 is driven away from the pipe argon passage 13 and the air expansion member 12 is driven into the second part to be welded.

[0067] Specifically, the inflatable member 12 is a balloon or a leather ball.

[0068] See also Figure 2 The air-jet bullet 16 includes an air-jet bullet 161 and an inflation elbow 162 , which are connected to each other. The air-jet bullet 161 can be inserted into the argon gas channel 13 of the pipe, and the inflation elbow 162 can connect the inflation hose 17 and the gas expansion member 12 .

[0069] Specifically, the balloon can be directly tied to the inflation elbow 162 by means of a rope or other components. When the sealing plug is set in the first part to be welded, the air bullet 161 extends into the argon channel 13 of the pipe and blocks the argon channel 13 of the pipe. After the second part to be welded is spot-welded with the first part to be welded, argon is introduced into the argon channel 13 of the pipe. When the argon reaches a certain pressure, the argon presses against the air bullet 161 located in the argon channel 13 of the pipe, so that the balloon and the air bullet 16 are launched toward the second part to be welded together, and the balloon is located in the second part to be welded. At this time, the release of argon is stopped, and the gas is sent into the inflation channel 15 of the pipe. The gas enters the balloon through the inflation hose 17 and the inflation elbow 162, thereby inflating the balloon and sealing the second part to be welded.

[0070] See also Figure 3 In another embodiment of the automatic argon filling system for intelligent welding of stainless steel pipes of the present invention, the pipe sealing assembly 10 includes an air expansion member 12 and a telescopic cylinder 18. The air expansion member 12 is connected to the pipe inflation channel 15 through the telescopic cylinder 18. The gas enters the telescopic cylinder 18, so that the telescopic cylinder 18 expands and pushes the air expansion member 12 into the second part to be welded, and inflates the air expansion member 12. In one embodiment, the inflation hose 17 is relatively soft and therefore has ductility and low cost. In another embodiment, the motion trajectory of the telescopic cylinder 18 is relatively stable, thereby ensuring that the motion trajectory of the balloon is relatively stable, and being able to control the position of the balloon in the second part to be welded when it is inflated.

[0071] See also Figure 1 and Figure 4The automatic argon filling system for intelligent welding of stainless steel pipes of the present invention also includes: a machine head argon channel 33, an argon charging valve 41, a machine head return air channel 34, a machine head charging channel 35, an air charging valve 42 and an argon detection device 43. The machine head argon channel 33 can be connected to the pipe fitting argon channel 13. The argon charging valve 41 is arranged on the machine head argon channel 33. The machine head return air channel 34 can be connected to the pipe fitting return air channel 14. The machine head charging channel 35 can be connected to the pipe fitting charging channel 15. The air charging valve 42 is arranged on the machine head charging channel 35. The argon detection device 43 is arranged on the machine head return air channel 34 and is used to detect the content of argon.

[0072] Specifically, the automatic argon filling system for intelligent stainless steel pipe welding of the present invention includes a welding head 3 and a pipe module 1. The welding head 3 includes an argon gas channel 33, an argon gas charging valve 41, a return gas channel 34, a gas charging channel 35, an air charging valve 42, and an argon gas detection device 43. The pipe module 1 is used to place the first part to be welded.

[0073] Specifically, the automatic argon filling system for intelligent welding of stainless steel pipes of the present invention also includes a machine head sealing assembly 50. The machine head sealing assembly 50 includes: a sealing plate 51, a T-tube 53, a sealing member 55, a spring 52 and a spring seat 54. The connection between the machine head argon channel 33 and the pipe argon channel 13, the connection between the machine head return gas channel 34 and the pipe return gas channel 14 and / or the connection between the machine head inflation channel 35 and the pipe inflation channel 15 can all be connected through the machine head sealing assembly. A joint 131 is provided on the pipe argon channel 13 or the pipe return gas channel 14 or the pipe inflation channel 15. The joint 131 is provided on the sealing plate 51. The T-tube 53 is provided at the end of the pipe argon channel 13 or the machine head return gas channel 34 or the machine head inflation channel 35. The sealing member 55 is provided with a channel and is installed at the end of the T-tube 53. The spring 52 is sleeved on the T-tube 53. One end of the spring 52 supports the T-tube 53, while the other end of the spring 52 rests in the spring seat 54. The spring seat 54 is stationary, while the T-tube 53 is movable relative to the spring seat 54. When the welding head 3 is docked with the pipe module 1, the seal 55 moves toward the pipe module 1, compressing the spring 52. This forces the T-tube 53 toward the pipe module 1, tightening the T-tube 53, the seal 55, and the sealing plate 51 in sequence, maintaining good connectivity between the pipe argon channel 13 and the head argon channel 33, the pipe return gas channel 14 and the head return gas channel 34, and the pipe inflation channel 15 and the head inflation channel 35.

[0074] When the assembly welding head 3 releases the pipe module 1, the argon channel 33 and the pipe argon channel 13 are disconnected, the connecting head return air channel 34 and the pipe return air channel 14 are disconnected, and the connecting head inflation channel 35 and the pipe inflation channel 15 are disconnected, the pipe return air channel 14 is disconnected from the head return air channel 34, and the gas in the gas expansion component 12 is released through the pipe return air channel 14, and the volume of the gas expansion component 12 shrinks.

[0075] The sealing plate 51 is the back plate of the pipe module 1 .

[0076] Specifically, when the welding head 3 is docked with the pipe module 1, the pipe argon channel 13 is connected to the head argon channel 33, the pipe return channel 14 is connected to the head return channel 34, and the pipe inflation channel 15 is connected to the head inflation channel 35. Before welding, the argon inflation valve 41 is opened, and argon can enter the pipe argon channel 13 through the head argon channel 33, so that the gas expansion component 12 is located in the second part to be welded. Subsequently, the argon inflation valve 41 is closed and the air inflation valve 42 is opened, and the gas can enter the pipe inflation channel 15 through the head inflation channel 35, and thus enter the gas expansion component 12. When the gas expansion component 12 is expanded to its place, the air inflation valve 42 is closed, and the argon inflation valve 41 is opened again, and the argon can enter the pipe argon channel 13 through the head argon channel 33, and thus enter the sealed cavity. The gas in the sealed cavity will leave the sealed cavity through the pipe return channel 14 and the head return channel 34. The gas in the head return air channel 34 is detected by the argon detection device 43, so as to detect the argon content in the current gas. When the argon content reaches the preset value, it means that the argon content in the sealed cavity meets the standard, and welding operations can be carried out at this time. After the welding of the first part to be welded and the second part to be welded is completed, the assembly welding head 3 releases the pipe module 1, the pipe argon channel 13 is disconnected from the head argon channel 33, the pipe return air channel 14 is disconnected from the head return air channel 34, and the pipe inflation channel 15 is disconnected from the head inflation channel 35. The gas in the gas expansion component 12 is released through the pipe return air channel 14, and the volume of the gas expansion component 12 shrinks. As a result, the gas expansion component 12 no longer expands against the second part to be welded.

[0077] See also Figure 4 The automatic argon filling system for intelligent stainless steel pipe welding of the present invention also includes a rotating slip ring 60. The head argon channel 33, the head return gas channel 34 and the head charging channel 35 can all pass through the rotating slip ring 60, thereby achieving static and dynamic continuous connection.

[0078] The present application also provides a method for operating an automatic argon filling system for intelligent welding of stainless steel pipes as described in any of the above embodiments, comprising the following steps:

[0079] S1: placing the pipe sealing assembly 11 in the first part to be welded, and placing the pipe sealing assembly 10 in the second part to be welded;

[0080] S2: driving the pipe sealing assembly 10 into the second part to be welded;

[0081] S3: sending gas into the pipe inflation channel 15 to expand the pipe sealing assembly 10 and seal the second part to be welded, thereby forming a sealed cavity in the first part to be welded and the second part to be welded;

[0082] S4: Argon gas can enter the sealed cavity through the argon gas channel 13 of the pipe and fill the sealed cavity, and the air in the sealed cavity can leave the sealed cavity through the return gas channel 14 of the pipe.

[0083] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An automatic argon filling system for intelligent welding of stainless steel pipes, characterized in that: include: A pipe sealing assembly (11) for sealing the first part to be welded; a pipe sealing assembly (10) capable of expanding and used for sealing a second part to be welded; and The pipe argon channel (13), the pipe return gas channel (14) and the pipe inflation channel (15) are arranged to penetrate the pipe sealing assembly (11); The pipe inflation channel (15) is in communication with the pipe sealing assembly (10), so that gas is fed into the pipe inflation channel (15) to inflate the pipe sealing assembly (10), thereby causing the pipe sealing assembly (10) to expand and seal the second part to be welded; The pipe sealing assembly (11) can cooperate with the pipe sealing assembly (10), thereby forming a sealed cavity between the first part to be welded and the second part to be welded; Argon gas can enter the sealed cavity through the pipe argon passage (13) and fill the sealed cavity, and air in the sealed cavity can leave the sealed cavity through the pipe return air passage (14).

2. The automatic argon filling system for intelligent welding of stainless steel pipes according to claim 1, characterized in that: On the pipe sealing assembly (11), the pipe argon passage (13) is located below the pipe return air passage (14).

3. The automatic argon filling system for intelligent welding of stainless steel pipes according to claim 1, characterized in that: The pipe sealing assembly (10) includes an air expansion member (12), an air-shooting bullet (16) and an air-inflating hose (17); The pipe inflation channel (15) is connected to the air expansion member (12) through the air-shooting bullet (16) and the inflation hose (17); The air expansion member (12) is connected to the air-shooting bullet (16); The air-jet bullet (16) is arranged in the argon passage (13) of the pipe, so that when argon gas is filled into the argon passage (13) of the pipe, the air-jet bullet (16) can be driven away from the argon passage (13) of the pipe and the air expansion member (12) can be driven into the second part to be welded.

4. The automatic argon filling system for intelligent welding of stainless steel pipes according to claim 3, characterized in that: The inflatable element (12) is a balloon or a leather ball.

5. The automatic argon filling system for intelligent welding of stainless steel pipes according to claim 3, characterized in that: The air-jet bullet (16) comprises an air-jet bullet (161) and an inflation elbow (162), wherein the air-jet bullet (161) and the inflation elbow (162) are connected, wherein the air-jet bullet (161) can be inserted into the argon gas channel (13) of the pipe, and the inflation elbow (162) can communicate with the inflation hose (17) and the gas expansion member (12).

6. The automatic argon filling system for intelligent stainless steel pipe welding according to claim 1, characterized in that: The pipe sealing assembly (10) includes an air expansion member (12) and a telescopic cylinder (18); The air expansion member (12) is connected to the pipe inflation channel (15) via the telescopic cylinder (18); Gas enters the telescopic cylinder (18), thereby causing the telescopic cylinder (18) to expand and push the gas expansion member (12) into the second part to be welded, and inflating the gas expansion member (12).

7. The automatic argon filling system for intelligent welding of stainless steel pipes according to claim 5, characterized in that: Also includes: The handpiece argon gas channel (33) is capable of communicating with the pipe argon gas channel (13); An argon gas filling valve (41) is provided on the argon gas channel (33) of the handpiece; The handpiece air return channel (34) is capable of communicating with the pipe air return channel (14); The air-inflating channel (35) of the handpiece can be communicated with the air-inflating channel (15) of the pipe; an air inflation valve (42), disposed on the air inflation channel (35) of the handpiece; and The argon gas detection device (43) is arranged on the air return channel (34) of the machine head and is used to detect the content of argon gas.

8. The automatic argon filling system for intelligent welding of stainless steel pipes according to claim 7, characterized in that: Also includes: The head sealing assembly (50) comprises: A sealing plate (51), wherein the pipe argon passage (13), the pipe return passage (14), or the pipe charging passage (15) is arranged on the sealing plate (51); A T-shaped tube (53) is provided at the end of the pipe argon passage (13) or the handpiece return air passage (34) or the handpiece charging passage (35); A sealing member (55) is mounted on the end of the T-shaped tube (53); a spring seat (54); and A spring (52) is sleeved on the T-shaped tube (53), one end of the spring (52) abuts against the T-shaped tube (53), and the other end of the spring (52) is seated in the spring seat (54); When the welding head (3) is docked with the pipe module (1), the spring (52) applies force to the T-tube (53), so that the T-tube (53), the sealing member (55) and the sealing plate (51) are tightened in sequence, thereby sealingly connecting the head argon channel (33) and the pipe argon channel (13) and / or sealingly connecting the head return air channel (34) and the pipe return air channel (14) and / or sealingly connecting the head inflation channel (35) and the pipe inflation channel (15).

9. The automatic argon filling system for intelligent welding of stainless steel pipes according to claim 8, characterized in that: When the welding machine head (3) releases the pipe module (1), the sealing member (55) and the sealing plate (51) are separated, the pipe return air channel (14) is disconnected from the machine head return air channel (34), the gas in the pipe sealing assembly (10) is released through the pipe return air channel (14), and the volume of the pipe sealing assembly (10) shrinks.

10. An operating method of an automatic argon filling system for intelligent welding of stainless steel pipes according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: placing the pipe sealing assembly (11) in a first part to be welded, and placing the pipe sealing assembly 10 in a second part to be welded; S2: driving the pipe sealing assembly (10) into the second part to be welded; S3: sending gas into the pipe inflation channel (15) to expand the pipe sealing assembly (10) and seal the second part to be welded, thereby forming a sealed cavity in the first part to be welded and the second part to be welded; S4: Argon gas can enter the sealed cavity through the argon gas passage (13) of the pipe and fill the sealed cavity, and the air in the sealed cavity can leave the sealed cavity through the air return passage (14) of the pipe.

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