CN218638764U - Welding trachea device and welding set - Google Patents

Abstract

The application relates to a welding gas pipe device and a welding device, which relate to the field of welding technology and comprise a pipeline, a control valve, a buffer unit and a discharge unit; one end of the pipeline is used for being communicated with a welding gun nozzle and used for conveying shielding gas to the welding gun nozzle; the control valve is arranged on the pipeline and is used for controlling the pipeline to be communicated or disconnected; the buffer unit is positioned between the control valve and the welding gun nozzle and is provided with a buffer inner cavity communicated with the pipeline; the discharge unit is used for discharging at least part of the protective gas in the buffer inner cavity when the control valve controls the pipeline to be disconnected. The welding gun has the effect of reducing the flow of the shielding gas sprayed from the nozzle of the welding gun at the arc striking stage of welding start.

Description

Welding trachea device and welding set

Technical Field

The application relates to the field of welding technology, in particular to a welding gas pipe device and a welding device.

Background

When a welding gun welds a structural part, shielding gas is often needed to isolate a welding position from air so as to ensure the welding quality.

The welding gun is provided with a nozzle which is communicated with a gas tank filled with shielding gas through a pipeline, the pipeline is provided with an electromagnetic valve for controlling the communication or disconnection of the pipeline, and the pressure of the shielding gas in the gas tank is greater than the atmospheric pressure. After the battery valve is opened, the protective gas in the gas tank flows to the nozzle through the pipeline and is sprayed out from the nozzle.

The welding process can be divided into three stages, namely an arc striking stage, a main welding stage and a burn-back stage. The state of the shielding gas directly influences the state of the welding arc, and the state of the shielding gas comprises the flow, the pressure, the components and the like of the shielding gas; the gas flow is set according to the contents of a welding method, welding process specifications, welding materials and the like, so that no air hole is formed in welding and the stability of a welding process is ensured.

In an arc striking stage of starting welding, after the battery valve is opened, protective gas with pressure in the gas tank enters the pipeline, the pressure of the protective gas in the pipeline is rapidly increased and exceeds the pressure of the protective gas provided by the gas tank to the pipeline, the flow of the protective gas flowing out of the nozzle in the stage is larger than that of the protective gas flowing out of the nozzle in the main welding stage, and the problems of arc striking and arc breaking, arc striking and splashing can occur.

SUMMERY OF THE UTILITY MODEL

The application provides a welding gas pipe device and a welding device, which are used for reducing the flow of protective gas sprayed from a nozzle of a welding gun at the arc striking stage of welding start.

The application provides a welding gas pipe device which comprises a pipeline, a control valve, a buffering unit and a discharging unit; one end of the pipeline is communicated with a welding gun nozzle and used for conveying shielding gas to the welding gun nozzle; the control valve is arranged on the pipeline and is used for controlling the pipeline to be communicated or disconnected; the buffer unit is positioned between the control valve and the welding gun nozzle and is provided with a buffer inner cavity communicated with the pipeline; the discharge unit is used for discharging at least part of the protective gas in the buffer inner cavity when the control valve controls the pipeline to be disconnected.

In the technical scheme, when the control valve control pipeline is disconnected, the discharge unit discharges part of the protective gas of the buffer inner cavity; when the control valve controls the pipeline to be communicated, protective gas with pressure enters the buffer inner cavity, one part of the protective gas fills the buffer inner cavity, and the other part of the protective gas flows to a welding gun nozzle through the pipeline;

because partial protective gas gets into the buffering inner chamber, consequently at the striking stage, the flow of the protective gas that flows from the welder nozzle reduces, avoids the control valve to open in the twinkling of an eye, and the protective gas pressure in the pipeline increases in the twinkling of an eye, and the flow that protective gas flowed from the welder nozzle increases in the twinkling of an eye and leads to the striking failure to improve the striking success rate.

Further, the buffer unit is a buffer box; the discharge unit comprises a partition, the partition is positioned in the buffer tank and divides an inner cavity of the buffer tank into two mutually isolated inner cavities, and the buffer inner cavity is one of the two inner cavities communicated with the pipeline; the shape and/or the position of the separator in the buffer box can be changed, and the separator is used for adjusting the volume of the buffer inner cavity.

In the technical scheme, the buffer box is partitioned from the buffer inner cavity communicated with the pipeline by the partition piece, and the volume of the buffer inner cavity is adjusted by changing the shape and/or the position of the partition piece; when in an arc striking stage, the volume of the buffer inner cavity is increased, and partial protective gas is stored; when the control valve control pipeline is disconnected, the volume of the buffer inner cavity is reduced, and the discharge unit discharges part of the protective gas.

Further, when the position of the separating piece in the buffer box is changeable, the separating piece is a sliding plate, the sliding plate is located in the buffer box and is in sliding and sealing connection with the buffer box, and the buffer inner cavity is located on one side of the sliding plate and is communicated with the pipeline; the discharge unit further includes a reset member that drives the slide plate to slide toward a direction in which the volume of the buffer chamber is reduced when the control valve controls the disconnection of the line.

In the technical scheme, after the control valve is communicated with the pipeline, protective gas with pressure enters the buffer inner cavity, the protective gas pushes the sliding plate to slide, the volume of the buffer inner cavity is increased, and part of the protective gas is stored in the buffer inner cavity;

when the control valve control pipeline is disconnected, the reset piece drives the sliding plate to move, so that the volume of the buffer inner cavity is reduced, part of protective gas of the buffer inner cavity is discharged, and part of gas is stored after the control valve control pipeline is communicated next time.

Further, the reset piece is an elastic piece which is in abutting contact with the sliding plate.

In the technical scheme, when the sliding plate is pushed by protective gas with pressure in the buffer inner cavity to slide, the sliding plate further compresses the elastic piece to deform; when the control valve control pipeline is disconnected, the pressure of the buffer inner cavity is reduced, and the elastic piece pushes the sliding plate to slide, so that the volume of the buffer inner cavity is reduced.

Furthermore, the buffer tank is provided with an air inlet communicated with the control valve and an air outlet communicated with the welding gun nozzle, and the buffer inner cavity is communicated with the air inlet and the air outlet.

In above-mentioned technical scheme, set up air inlet and gas outlet and buffering inner chamber intercommunication on the baffle-box, through the pipeline intercommunication between welder nozzle and the gas outlet, through the pipeline intercommunication between control valve and the air inlet, realize behind control valve intercommunication pipeline, the protective gas gets into buffering inner chamber and then from the welder nozzle blowout.

Further, when the shape of the partitioning member in the surge tank is changeable, the partitioning member is a flexible member that can be elastically deformed.

In the technical scheme, when the control valve controls the pipeline to be communicated, protective gas with pressure enters the buffer inner cavity, the pressure in the buffer inner cavity is increased, the separator generates elastic deformation, the volume of the buffer inner cavity is increased, and the buffer inner cavity stores part of the protective gas;

when the control valve control pipeline is disconnected, the separator restores the original shape, the volume of the buffer inner cavity is reduced, and partial protective gas of the buffer inner cavity is exhausted.

The welding gun nozzle assembly further comprises a one-way valve located between the buffer unit and the welding gun nozzle, and the one-way valve is communicated from the buffer unit to the welding gun nozzle.

In the technical scheme, the one-way valve enables the protective gas to flow to the welding gun nozzle from the buffer unit only, and external air is prevented from entering the buffer unit.

Further, the discharge unit comprises an air suction pump, and an air suction port of the air suction pump is used for being communicated with the buffer inner cavity.

In the technical scheme, after the control valve controls the pipeline to be disconnected, the protective gas in the buffer inner cavity is directly extracted through the air extracting pump, the protective gas in the buffer inner cavity is reduced, and the protective gas in the buffer inner cavity is discharged.

Further, the air outlet of the air suction pump is communicated with the welding gun nozzle.

In the technical scheme, after the welding gun is powered off and the control valve controls the pipeline to be disconnected, the protective gas of the buffer inner cavity is extracted by the air extracting pump and then is sprayed out by the welding gun to be sent to the welding seam position, the isolation time of the welding seam and air is further prolonged, and the welding quality is improved.

The application also provides a welding device which comprises a welding gun and a welding gas pipe device.

In the technical scheme, the welding gas pipe device reduces the flow of protective gas sprayed from the nozzle in the arc striking stage of welding, the success rate of arc striking of the welding gun is high, and the welding device is convenient to use.

Drawings

FIG. 1 is a schematic view of a welding apparatus according to an embodiment;

FIG. 2 is a schematic sectional view showing the structure of the buffer tank and the partition in one embodiment;

FIG. 3 is a schematic sectional view showing the structure of the buffer tank and two sliding plates in one embodiment;

FIG. 4 is a schematic sectional view showing the structure of the seal ring and the slide plate in one embodiment;

FIG. 5 is a schematic cross-sectional view of the buffer tank and the flexible member in one embodiment;

FIG. 6 is a schematic sectional view showing the structure of the buffer tank and the partition in one embodiment;

FIG. 7 is a schematic diagram of an embodiment of an air extractor pump in parallel with a check valve;

FIG. 8 is a schematic view of an embodiment of the suction pump in series with a check valve.

1. A pipeline; 11. a first tube; 12. a second tube; 13. a third tube; 14. a fourth tube; 15. a fifth pipe; 2. a control valve; 3. a buffer tank; 31. a first inner chamber; 32. a second lumen; 33. an air inlet; 34. an air outlet; 35. a seal ring; 4. a discharge unit; 41. a separator; 411. a sliding plate; 412. a flexible member; 42. a reset member; 43. an air pump; 5. a welding gun; 6. a one-way valve; 7. a gas cylinder.

Detailed Description

The present application is described in further detail below with reference to the figures and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.

The embodiment of the application discloses welding trachea device. Referring to fig. 1, the welding air pipe device is used for conveying shielding gas in the gas cylinder 7 to a nozzle of the welding gun 5 to be sprayed out, and when the welding gun 5 is used for welding, the welding seam is isolated from outside air by the shielding gas, so that the requirements of a welding process are met, and the welding quality is guaranteed.

The welding process can be divided into three stages according to the time sequence, namely an arc striking stage, a main welding stage and a burn-back stage. In the arc striking stage, protective gas with pressure in the gas cylinder 7 enters the welding gas pipe device, and the protective gas in the welding gas pipe device starts to be sprayed out from a nozzle of the welding gun 5. In the main welding stage, the shielding gas in the gas cylinder 7 continuously enters the welding gas pipe device, and the shielding gas smoothly flows out from the nozzle of the welding gun 5. And in the burn-back stage, the protective gas cools and cools the welding seam.

Referring to fig. 1, the welding gas pipe apparatus includes a pipe 1, a control valve 2, a buffer unit, and a discharge unit 4.

One end of the pipeline 1 is communicated with a nozzle of the welding gun 5 and used for conveying shielding gas to the nozzle of the welding gun 5; the control valve 2 is arranged on the pipeline 1 and is used for controlling the pipeline 1 to be communicated or disconnected.

Specifically, one end of the pipeline 1 is communicated with the gas cylinder 7, and the other end of the pipeline is communicated with a nozzle of the welding gun 5. The gas cylinder 7 is filled with protective gas with pressure, the protective gas in the gas cylinder 7 enters the pipeline 1, and the protective gas in the pipeline 1 is discharged from a nozzle of the welding gun 5. The shielding gas is in this embodiment one of nitrogen or carbon dioxide.

The control valve 2 is an electromagnetic switch valve, the control valve 2 is arranged on the pipeline 1, and two ends of the control valve 2 are respectively communicated with the pipeline 1. In the present embodiment, the control valve 2 is fixed to a wire feeder, which is a device for feeding a welding wire to a welding gun.

When the control valve 2 is opened, the pipeline 1 is communicated, and the protective gas in the gas cylinder 7 flows along the pipeline 1 and is sprayed out from a nozzle of the welding gun 5. When the control valve 2 is closed, the pipeline 1 is disconnected, and the flow of the protective gas in the pipeline 1 between the gas bottle 7 and the control valve 2 is stopped.

Referring to fig. 1, the buffer unit is located between the control valve 2 and the nozzle of the welding gun 5, and the buffer unit has a buffer inner cavity communicated with the pipeline 1; the discharge unit 4 is used for discharging at least part of the protective gas in the buffer cavity when the control valve 2 controls the pipeline 1 to be disconnected.

Referring to fig. 2, as an alternative, the buffer unit is a buffer tank 3. Specifically, surge tank 3 can be square box, circle case or special-shaped case, selects in this embodiment to use square box. Buffer box 3 is fixed on sending the silk machine, and the buffer unit inner chamber has the buffer inner chamber isolated with external world, and buffer inner chamber and pipeline 1 intercommunication. In other embodiments, the buffer unit may be a buffer tube closed at both ends, or the buffer unit may be a closed buffer chamber.

When the gas protection device is used, after the control valve 2 is disconnected from the pipeline 1, the discharge unit 4 discharges part of the protection gas of the buffer inner cavity, when the control valve 2 is opened next time, the protection gas with pressure in the gas cylinder 7 quickly enters the pipeline 1 and the buffer inner cavity, part of the protection gas fills the buffer inner cavity, part of the pressure is released, and the rest of the protection gas continues to flow along the pipeline and is sprayed out from the nozzle of the welding gun 5, so that the flow of the protection gas sprayed out from the nozzle of the welding gun 5 is reduced.

In the main welding stage, the shielding gas can flow to the nozzle of the welding gun 5 through the buffer inner cavity and the pipeline 1, and the shielding gas is kept to be stably sprayed out from the nozzle of the welding gun 5.

Referring to fig. 2, as an alternative, the buffer tank 3 is provided with a gas inlet 33 for communicating with the control valve 2, and a gas outlet 34 for communicating with a nozzle of the welding gun 5, and the first inner chamber 31 communicates with the gas inlet 33 and the gas outlet 34.

Specifically, two opposite side plates of the buffer tank 3 are respectively provided with a hole, wherein the hole communicated with the control valve 2 through a pipeline is an air inlet 33, and the hole communicated with the nozzle of the welding gun 5 through a pipeline is an air outlet 34.

In another embodiment, the buffer tank 3 is provided with an inlet connection for communication with the control valve 2 and an outlet connection for communication with the nozzle of the welding gun 5.

For the convenience of describing the relationship between the line 1 and the buffer tank 3, the control valve 2, and the nozzle of the welding gun 5, the line 1 will be described below.

Referring to fig. 1, in the present embodiment, an adapter fixed to the wire feeder is provided between the buffer tank 3 and the nozzle of the welding gun 5.

The piping 1 comprises a first pipe 11, a second pipe 12, a third pipe 13 and a fourth pipe 14. Wherein, the both ends of first pipe 11 communicate with gas cylinder 7 and control valve 2 respectively, and the both ends of second pipe 12 communicate with control valve 2 and the air inlet 33 of baffle-box 3 respectively, and the both ends of third pipe 13 communicate with the gas outlet 34 and the adapter of baffle-box 3 respectively, and the both ends of fourth pipe 14 communicate with the nozzle of adapter and welder 5 respectively. The connection of the two ends of the pipeline with other structural parts can use flange joints or quick-plug joints.

In another embodiment, the buffer tank 3 is directly communicated with the nozzle of the welding gun 5 through a pipeline.

The following description will be made of the discharge unit 4.

Referring to fig. 2, the discharge unit 4 includes a partition 41, the partition 41 is located in the buffer tank 3, and partitions an inner cavity of the buffer tank 3 into two mutually isolated inner cavities, and the buffer inner cavity is an inner cavity of the two inner cavities that is communicated with the pipeline 1; the shape and/or position of the spacer 41 in the buffer tank 3 is variable for adjusting the volume of the buffer chamber.

The separator 41 divides the inner cavity of the buffer tank 3 into two mutually isolated inner cavities, namely a first inner cavity 31 and a second inner cavity 32, wherein the buffer inner cavity is the first inner cavity 31 communicated with the pipeline; the second lumen 32 communicates with the outside. In other embodiments, the second lumen 32 is relatively isolated from the environment.

Referring to fig. 2, as an alternative, when the position of the partition 41 in the buffer tank 3 is variable, the partition 41 is a sliding plate 411, the sliding plate 411 is located in the buffer tank 3, and the sliding plate 411 is slidably and hermetically connected with the buffer tank 3, and the buffer inner chamber is located at one side of the sliding plate 411 and is communicated with the pipeline 1.

Specifically, the outer side surface of the sliding plate 411 is matched with the inner side surface of the buffer box 3, and the sliding plate 411 slides along the inner surface of the buffer box 3 in the buffer box 3. The side of the sliding plate 411 is provided with a sealing groove, the side of the sliding plate 411 is sleeved with a dynamic sealing ring embedded in the sealing groove, when the dynamic sealing ring keeps the sliding plate 411 and the buffer box 3 to slide, the first inner cavity 31 and the second inner cavity 32 are isolated from each other, and when the sliding plate 411 slides, the volume of the first inner cavity 31 changes.

The discharge unit 4 further comprises a reset member 42, the reset member 42 driving the sliding plate 411 to slide towards the direction of decreasing volume of the buffer chamber when the control valve 2 controls the disconnection of the line 1.

When the control valve 2 is opened, the protective gas with pressure in the pipeline 1 enters the buffer tank 3, the protective gas pushes the sliding plate 411 to slide, the volume of the buffer inner cavity is increased, and part of the protective gas is stored in the buffer inner cavity. When the control valve 2 is closed, the reset piece 42 pushes the sliding plate 411 to slide, so that the volume of the buffer inner cavity is reduced, and part of the protective gas in the buffer inner cavity is exhausted.

Referring to fig. 1, as an alternative, the restoring member 42 is an elastic member which is in press-contact with the sliding plate 411. Specifically, the elastic member is a pressure spring, the pressure spring is located in the second inner cavity 32, and two ends of the pressure spring are respectively contacted with the sliding plate 411 and the buffer box 3 to be pressed against each other. In another embodiment, the elastic member is an elastic sheet.

In this embodiment, the second inner cavity 32 is communicated with the outside, and the force applied to the sliding plate 411 by the shielding gas in the first inner cavity 31 overcomes the frictional resistance between the sliding plate 411 and the buffer box 3 and the pressure of the elastic member on the sliding plate 411, so as to drive the sliding plate 411 to move, thereby increasing the volume of the first inner cavity 31.

When the control valve 2 is closed and the pressure in the buffer inner cavity is equal to the atmospheric pressure, the elastic force applied to the sliding plate 411 by the elastic member overcomes the frictional resistance between the sliding plate 411 and the buffer tank 3 to drive the sliding plate 411 to slide, so as to reduce the volume of the first inner cavity 31.

In another embodiment, the reset member 42 is a driving cylinder, the cylinder body of the reset member 42 is fixed to the buffer box 3, and the piston rod is fixedly connected to the sliding plate 411. The reset piece 42 is started when the control valve 2 is closed, and controls the piston rod to move, so that the sliding plate 411 is driven to move, and the volume of the buffer inner cavity is reduced; when the control valve 2 is opened, the pressurized shielding gas in the buffer tank 3 pushes the sliding plate 411 to move, and the sliding plate 411 drives the piston rods to move synchronously.

In another embodiment, the second inner cavity 32 is closed to the outside, and the gas in the second inner cavity 32 is compressed when the sliding plate 411 moves.

Referring to fig. 3, in another embodiment, the partition 41 includes two sliding plates 411, a gap between the two sliding plates 411 is a buffer inner cavity, and the air inlet 33 and the air outlet 34 are located between the two sliding plates 411. The restoring member 42 includes a plurality of elastic members, which are respectively located to press against the surfaces of the two sliding plates 411 facing away from the first inner cavity 31.

The provision of the two sliding plates 411 enables more gas to be stored in the buffer chamber at the start of the arc initiation phase, further reducing the flow of shielding gas from the nozzle of the welding torch 5 during the arc initiation phase.

Referring to fig. 4, in another embodiment, a convex sealing ring 35 is fixed on the inner side surface of the buffer tank 3, and a sealing ring is arranged on the sealing ring 35 between the sealing ring 35 and the sliding plate 411.

When the sliding plate 411 moves towards the direction of increasing the volume of the first inner cavity 31, the sliding plate 411 moves towards the sealing ring 35 until it is pressed against the sealing ring on the sealing ring 35, thereby improving the sealing effect of the relative isolation between the first inner cavity 31 and the second inner cavity 32.

Referring to fig. 5, as an alternative, when the shape of the partitioning member 41 in the surge tank 3 is variable, the partitioning member 41 is a flexible member 412 that can be elastically deformed.

Specifically, the flexible member 412 may be an elastic membrane made of rubber or latex, and when a pressure difference exists between two sides of the thickness of the elastic membrane, the elastic membrane itself generates an extension deformation; when the pressure difference across the thickness is reduced until the same, the elastic film contracts to return to its original shape.

When the protective gas with pressure in the gas cylinder 7 enters the buffer cavity, the pressure in the buffer cavity increases, and the partition 41 elastically deforms, so that the partition 41 expands toward the second cavity 32 until the tension of the partition 41 is balanced with the pressure in the buffer cavity, or the partition 41 contacts the inner surface of the buffer tank 3. Thereby realizing the increase of the volume of the buffer inner cavity and leading the buffer inner cavity to store partial protective gas. When the control valve 2 controls the pipeline 1 to be disconnected, the flexible part 412 contracts and restores the original shape, and part of the protective gas in the buffer inner cavity is discharged to the welding gun nozzle through the pipeline.

Referring to fig. 6, as an alternative, when the position and shape of the partition 41 in the buffer tank 3 are variable, the partition 41 includes a sliding plate 411, a flexible member 412 capable of elastic deformation, and a returning member 42. The sliding plate 411 is connected with the buffer box 3 in a sealed sliding manner, a hole is formed in the sliding plate 411, and the flexible part 412 is a rubber film fixed in the hole to seal the hole.

When the buffer chamber is filled with pressurized shielding gas, the sliding plate 411 slides, and the flexible member 412 is expanded and deformed, so that the buffer chamber stores a part of the shielding gas.

Referring to fig. 7, as an alternative, a check valve 6 is further included between the buffer unit and the nozzle of the welding gun 5, the check valve 6 being in communication from the buffer unit to the nozzle of the welding gun 5.

In particular, the non-return valve 6 is arranged on the third pipe 13, the non-return valve 6 being located between the tank 3 and the adaptor. When the control valve 2 is opened, the protective gas in the buffer unit can flow to a nozzle of the welding gun 5 through the one-way valve 6; when the control valve 2 is closed, the one-way valve 6 can prevent outside air from flowing back to enter the buffer unit, and the condition that air flows into a nozzle of the welding gun 5 from the buffer unit in an arc striking stage is avoided.

Referring to fig. 7, as an alternative, the discharge unit 4 includes a suction pump 43, and a suction port of the suction pump 43 communicates with the buffer chamber.

In one embodiment, the buffer unit is a buffer tank 3 whose inner cavity is closed with the outside, the discharge unit 4 does not include a partition 41, and the suction port of the suction pump 43 communicates with the buffer inner cavity.

When the welding gun 5 is closed, the control valve 2 is synchronously closed, the pipeline 1 is disconnected, the air extracting pump 43 is opened, the air extracting pump 43 extracts the protective gas in the buffer tank 3, the pressure in the buffer tank 3 is reduced, and the pressure in the buffer tank 3 is lower than the atmospheric pressure. When the control valve 2 is opened again, due to the fact that a negative pressure area is arranged in the buffer tank 3, when the control valve 2 is opened, the shielding gas enters the buffer inner cavity, part of the shielding gas is filled in the buffer tank 3, and the rest of the shielding gas flows out from the nozzle of the welding gun 5 through the pipeline 1, so that the flow of the shielding gas sprayed out from the nozzle of the welding gun 5 in the arc striking stage is reduced.

In another embodiment, the discharge unit 4 includes a partition 41 and a suction pump 43, the suction pump 43 pumps the gas in the buffer chamber, and the shape and/or position of the partition 41 in the buffer tank 3 is variable for adjusting the volume of the buffer chamber.

When the shape of the partitioning member 41 in the buffer tank 3 is changed, the suction pump 43 sucks the shielding gas in the buffer chamber, and the shape of the partitioning member 41 expands toward the buffer chamber, so that the volume of the buffer chamber is reduced.

When the position of the partition 41 in the buffer tank 3 is changed, the suction pump 43 sucks the shielding gas in the buffer chamber, and the partition 41 slides, so that the volume of the buffer chamber is reduced.

Referring to fig. 7, as an alternative, the air outlet 34 of the air pump 43 communicates with the nozzle of the welding gun 5.

In this embodiment, when the air pump 43 is closed, the two ends are connected, and when the pressure inside the buffer unit is greater than the atmospheric pressure, the shielding gas inside the buffer unit can flow toward the nozzle of the welding gun 5 through the air pump 43. The suction pump 43 is provided on the third pipe 13. When the control valve 2 is disconnected, the suction pump 43 draws off the protective gas from the buffer unit and flows to the nozzle of the welding torch 5.

When the welding is finished, the welding gun 5 is controlled to be powered off, and after the control valve 2 is closed, the air extracting pump 43 is started, the protective gas in the buffer unit is extracted by the air extracting pump 43 and continuously flows to the nozzle of the welding gun 5, the isolation time of a welding line and the outside air is prolonged, and therefore the welding quality is further improved.

Referring to FIG. 8, in another embodiment, the suction pump 43 is closed and is not open at both ends. The pipeline 1 further comprises a fifth pipe 15, the fifth pipe 15 is connected with the third pipe 13 in parallel, the air suction pump 43 is arranged on the fifth pipe 15, and the one-way valve 6 is arranged on the fifth pipe 15.

In another embodiment, the air inlet 33 of the air pump 43 is communicated with the buffer tank 3, and the air outlet 34 is communicated with the atmosphere.

Referring to fig. 1, the embodiment of the present application further discloses a welding device, which includes a welding gun 5 and a welding gas pipe device, where the welding gun 5 uses the welding gas pipe device to provide shielding gas, and the welding gas pipe device leads the shielding gas to a nozzle of the welding gun 5, so as to provide a proper amount of shielding gas in an arc striking stage of welding of the welding gun 5, and improve a success rate of arc striking during welding.

The welding device also comprises a controller, wherein the controller controls the opening or closing of the control valve, the connection or disconnection of the welding gun and the power supply, and the starting or closing of the air suction pump. When the controller controls the welding gun to be opened, the controller controls the control valve to be opened; when the controller controls the welding gun to be closed, the controller controls the control valve to be closed and controls the air suction pump to be opened.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The present application has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the present application can be subjected to various substitutions and improvements, and the substitutions and the improvements are all within the protection scope of the present application.

Claims (10)

1. A welding gas pipe device is characterized by comprising a pipeline, a control valve, a buffer unit and a discharge unit; wherein,

one end of the pipeline is used for being communicated with the welding gun nozzle and used for conveying shielding gas to the welding gun nozzle;

the control valve is arranged on the pipeline and is used for controlling the pipeline to be communicated or disconnected;

the buffer unit is positioned between the control valve and the welding gun nozzle and is provided with a buffer inner cavity communicated with the pipeline;

the discharge unit is used for discharging at least part of the protective gas in the buffer inner cavity when the control valve controls the pipeline to be disconnected.

2. The weld gas tube apparatus according to claim 1, wherein the buffer unit is a buffer tank;

the discharge unit comprises a partition, the partition is positioned in the buffer tank and divides an inner cavity of the buffer tank into two mutually isolated inner cavities, and the buffer inner cavity is one of the two inner cavities communicated with the pipeline;

the shape and/or the position of the separator in the buffer box can be changed, and the separator is used for adjusting the volume of the buffer inner cavity.

3. The welding gas pipe apparatus according to claim 2, wherein when the position of the partition member in the buffer box is changeable, the partition member is a sliding plate, the sliding plate is located in the buffer box and is in sliding sealing connection with the buffer box, and the buffer inner cavity is located on one side of the sliding plate and is communicated with the pipeline;

the discharge unit further includes a reset member that drives the slide plate to slide toward a direction in which the volume of the buffer chamber is reduced when the control valve controls the disconnection of the line.

4. The welding gas pipe apparatus according to claim 3, wherein the restoring member is an elastic member in press-contact with the slide plate.

5. The welding gas tube apparatus of claim 2 wherein said buffer tank is provided with a gas inlet for communication with said control valve and a gas outlet for communication with said torch nozzle, said buffer chamber being in communication with said gas inlet and said gas outlet.

6. The weld gas pipe apparatus according to claim 2, wherein the partitioning member is a flexible member that is elastically deformable when a shape of the partitioning member is changeable in the surge tank.

7. The welding gas tube apparatus of any one of claims 1 to 6, further comprising a check valve between the buffer unit and the torch nozzle, the check valve communicating from the buffer unit to the torch nozzle.

8. The welding gas pipe apparatus according to claim 7, wherein the discharge unit comprises a suction pump, and a suction port of the suction pump communicates with the buffer inner cavity.

9. The welding gas line apparatus of claim 8, wherein the gas outlet of the gas extraction pump is adapted to communicate with the torch nozzle.

10. A welding apparatus comprising a welding torch and a welding gas tube apparatus as claimed in any one of claims 1 to 9.

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