CN102059436A - Protection device for gas-protective welding - Google Patents

Abstract

The protective device for gas shielded welding provided by the present invention includes: a gas pipe, a centering cover plate, an air guiding rod, a supporting rib, and a sealing cover plate; the sealing cover plate is connected with the supporting rib, and the connecting air guiding rod The lower end of the rod is flexibly connected to the support rib; the connecting air guiding rod is fixed with the centering cover plate through a fastening mechanism, and the connecting air guiding rod is connected with the air pipe; the connecting air guiding rod is a hollow structure, and the connecting air guiding rod An air outlet is provided on the wall of the rod tube; an air outlet is provided on the centering cover; the sealing cover is made of elastic material. Utilizing the present invention to perform gas shielding on intersecting line welds of two rotary curved surfaces can save a lot of shielding gas, provide continuous, stable and uniform shielding gas, greatly improve the welding quality of the weld seam, and reduce the cost. The present invention is also suitable for gas-shielded welding of tee pipes with different diameters, different materials and specifications, and intersecting line welds of two different curved surfaces of revolution.

Description

Protective devices for gas shielded welding

technical field

The invention relates to a protective device for gas-shielded welding, in particular to a protective device for gas-shielded welding of a three-way pipe and intersecting line welds of two curved surfaces of revolution. Especially the protection device for the three-way pipe of special materials such as stainless steel pipe or zirconium pipe and the gas-shielded welding of the intersecting line weld of two rotary surfaces.

Background technique

In the gas shielded welding of the stainless steel pipe tee pipe and the intersecting line weld of two rotary surfaces, the usual gas shielding method is to continuously fill the inner cavity of the pipe to be welded with the required shielding gas; to ensure the protection during the welding process. The gas forms a local gas protective layer around the arc to prevent the intrusion of gas harmful to the molten droplet and molten pool, ensuring the stability of the welding process; and the compression of the arc column makes the arc heat concentrated, the molten pool is small, and its welding heat-affected zone The welding deformation is relatively reduced, and the welding quality is easy to guarantee; the work efficiency can be improved, and the cost can be reduced.

However, in the gas shielded welding of the installation, production and maintenance of tee pipes and intersecting line welds of two rotary surfaces, because the limbs cannot enter the narrow and irregularly shaped inner cavity, corresponding The cavity is continuously provided and filled with the required shielding gas; the gas consumption is large, and the gas concentration and gas temperature near the weld are difficult to effectively control; the welding quality of the weld will be guaranteed by the consumption of a larger amount of shielding gas, and the cost very high.

Contents of the invention

The protection device for gas shielded welding provided by the present invention aims to provide a high-efficiency, low gas consumption; light and simple structure; fast loading and unloading, easy to carry; suitable for installation, production, and maintenance of different diameters, multi-working conditions and multi-materials, A protective device for gas-shielded welding of a series of specification tee pipes and intersecting line welds of two different rotary surfaces.

In order to solve the above problems, the protection device for gas shielded welding provided by the present invention includes: a protection device for gas shielded welding, which is characterized in that it includes:

Trachea, centering cover plate, air guiding rod, support rib, sealing cover plate; the sealing cover plate is connected with the supporting rib, and the lower end of the connecting air guiding rod is flexibly connected with the supporting rib; the connecting air guiding rod Fixed with the centering cover plate by a fastening mechanism, the connecting air guiding rod is connected with the air pipe; the connecting air guiding rod is a hollow structure, and the pipe wall of the connecting air guiding rod is provided with an air outlet; the centering cover plate Vent holes are provided; the sealing cover plate is made of elastic material.

As a preferred solution of the present invention, the elastic material is metal, and the metal is copper alloy, or stainless steel, or high carbon steel, or spring steel sheet.

As a preferred solution of the present invention, the sealing cover is oval or circular, and the sealing cover is concave.

As a preferred solution of the present invention, the sealing cover plate and the support rib adopt a detachable connection structure, and the detachable connection structure is a screw connection or a quick connector connection.

As a preferred solution of the present invention, the threaded connection is a bolt-nut connection, or a self-tapping screw connection.

As a preferred solution of the present invention, the supporting ribs are groove-shaped.

As a preferred solution of the present invention, the lower end of the connecting air guide rod is provided with a hinge hole, the support rib is provided with a hinge hole, and the hinge pin passes through the hinge hole of the support rib and the hinge hole of the connecting air guide rod to form a hinged connection. .

As a preferred solution of the present invention, the lower end of the connecting air rod is provided with a spherical body, and the support rib is provided with a ball socket, and the two form a spherical hinged connection.

As a preferred solution of the present invention, the lower end of the connecting air guide rod and the support rib are connected by a universal joint hinge.

As a preferred solution of the present invention, a flow stabilizing layer is provided inside the connecting air guide rod, and the flow stabilizing layer is a wire mesh structure.

As a preferred solution of the present invention, the lower end surface of the centering cover plate is a stepped flange structure or an annular groove structure, and the exhaust hole is connected to each step boundary of the stepped flange structure, or the exhaust hole The holes partially coincide with each groove boundary of the groove structure.

As a preferred solution of the present invention, the fastening mechanism is a threaded connection, and the connecting air guide rod is an external thread structure, and the nut is screwed into the external thread of the connecting air guide rod;

As a preferred solution of the present invention, the fastening mechanism is two eccentric sleeves that can adjust the phase and cover the outer circle of the air guide rod;

As a preferred solution of the present invention, the fastening mechanism is an inner-wrapped multi-lobed engagement piece sleeved on the outer circle of the air guide rod, and there is a radial engagement gap with the air guide rod;

As a preferred solution of the present invention, the fastening mechanism is a C-shaped ring, and the C-shaped ring is sleeved on the outer circle of the connecting air guide rod. By adjusting the bolt rotation direction of the notch gap of the C-shaped ring, the C-shaped ring Engage or release radially with the air guide rod;

As a preferred solution of the present invention, the fastening mechanism is an O-ring, and the O-ring is sleeved on the outer circle of the connecting air guide rod, and the bolt rotating by adjusting the O-ring radially pointing to the center of the connecting air guide rod Direction, to achieve radial engagement or release of the O-ring and the connecting air guide rod.

As a preferred solution of the present invention, the air pipe is provided with a gas control valve.

As a preferred solution of the present invention, the air pipe is connected to the air guide rod through a conversion joint, at least one end of the conversion joint is a threaded pair, or a quick-release plug interface, or an insertion clamp, or an insertion clamp. throat hoop.

As a preferred solution of the present invention, the trachea and the air guide rod are directly connected by a threaded pair, or a quick-release connector, or inserted into a clamp, or inserted into a throat clamp.

The invention provides a protective device for gas shielded welding with high efficiency and low gas consumption. The shielding gas can be adjusted to adjust the concentration of the shielding gas, so that the welding quality of the weld is greatly improved, and at the same time, the cost is effectively reduced because the shielding gas consumed is very little. The present invention is also suitable for gas-shielded welding of tee pipes with different diameters, different materials and specifications, and intersecting line welds of two different curved surfaces of revolution.

Description of drawings

Fig. 1 is the front sectional view of the use state of the protection device for the gas shielded welding of the intersecting line weld of the tee pipe according to the present invention;

Fig. 2 is the front cross-sectional view of the protection device used for gas-shielded welding of intersecting line welds of elliptical heads according to the present invention;

FIG. 3 is a partial enlarged view of the side cross-sectional view of part A in FIG. 2 .

Fig. 4 is a front sectional view of the protection device used for gas-shielded welding of intersecting line welds of elliptical heads according to the present invention;

FIG. 5 is a partial enlarged view of the side cross-sectional view of part B in FIG. 4 .

The reference signs are as follows:

1 sealing cover 2 support rib 301 hinge pin

302 bolts and nuts 303 self-tapping screws 304 universal joint hinge connection

305 spherical hinge connection 4 air guide rods 401 wire mesh

402 Air outlet 5 Sealing cover 501 Air outlet

601 Nut 602 Eccentric Sleeve 7 Adapter

8 Trachea 9 Gas control valve 10 Gas protection chamber

11 pipes 12 supervisors 13 intersecting lines

14 take over 15 oval head

Detailed ways

The present invention will be further described below in conjunction with preferred specific embodiments.

Example 1:

As shown in Fig. 1, the protective device for gas shielded welding of intersecting line welds of tee pipes of the present invention includes a gas control valve 9, a gas pipe 8, a conversion joint 7, a centering cover plate 5, and an air guide rod 4, Support rib 2, sealing cover plate 1.

The protective gas flows in through the trachea 8, and a gas control valve 9 is provided at the entrance of the trachea 8 to control the flow and velocity of the protective gas. The air guiding rod 4 is an external thread structure, and is fixed with the centering cover plate 5 by a nut 601 .

The connecting air guiding rod 4 is a hollow structure, and evenly distributed air outlet holes 402 are arranged on the pipe wall of the connecting gas guiding rod 4 to fill the protective gas in the connecting gas guiding rod 4 into the gas protection chamber 10; The net 401 is used to achieve a steady flow effect, so that the gas in the gas protection chamber 10 is evenly distributed.

The centering cover 5 is provided with evenly distributed exhaust holes 501, which can discharge overheated, ineffective or excessive gas in time; Fitted radially, the center line of the exhaust hole 501 coincides with the boundary of each stepped flange structure.

The support rib 2 is a channel steel structure, the sealing cover plate 1 is connected with the bottom of the support rib 2 through bolts and nuts 302, and the lower end of the air guide rod 4 is provided with a hinge hole, and the support rib 2 is provided with two hinge holes, the hinge pin 301 Through the hinge hole of the support rib and the hinge hole of the connecting air guide rod, a hinged connection is formed. When in use, the sealing cover plate 1 is arranged below the interface of the main pipe 12 and the branch pipe 11 intersecting line 13 of the three-way pipe; wherein, the sealing cover plate 1 is an oval elastic and rollable copper alloy sheet, which can be adapted and covered with different radii The intersecting line interface of the main pipe plays a relative sealing role. The sealing cover plate 1 , the inner surface 13 of the interface intersecting with the main pipe tee, the inner wall of the branch pipe 11 and the inner wall of the centering cover plate 5 form a gas protection chamber 10 .

Example 2:

As shown in Figure 2, the protection device of the present invention for the gas-shielded welding of the intersecting line weld of the two rotary curved surfaces of the elliptical head includes a gas control valve 9, a gas pipe 8, a conversion joint 7, a centering cover plate 5, and a gas guide Rod 4, supporting rib 2, sealing cover 1.

The protective gas flows in through the trachea 8, and a gas control valve 9 is provided at the entrance of the trachea 8 to control the flow and velocity of the protective gas. The air guiding rod 4 is an external thread structure, and is fixed with the centering cover plate 5 by a nut 601 .

The connecting air guiding rod 4 is a hollow structure, and evenly distributed air outlet holes 402 are arranged on the pipe wall of the connecting gas guiding rod 4 to fill the protective gas in the connecting gas guiding rod 4 into the gas protection chamber 10; The net 401 is used to achieve a steady flow effect, so that the gas in the gas protection chamber 10 is evenly distributed.

The centering cover 5 is provided with evenly distributed exhaust holes 501, which can discharge overheated, ineffective or excessive gas in time; Fitted radially, the center line of the exhaust hole 501 coincides with the boundary of each stepped flange structure.

In conjunction with Fig. 3, the support rib 2 is a channel steel structure, and the sealing cover plate 1 is connected with the bottom of the support rib 2 through self-tapping screws 303; the lower end of the connecting air guide rod 4 is provided with a spherical entity, and the support rib is provided with The ball socket, the two form a spherical hinged connection 305.

When in use, the sealing cover 1 is arranged below the interface of the intersecting line 13 between the two rotary surfaces of the elliptical head and the connecting pipe 14; wherein, the sealing cover 1 is an elliptical elastic and rollable copper alloy sheet, which can be adapted and covered with different curvatures The intersecting line interface of the radial elliptical head plays a role of relative sealing. The sealing cover 1 , the inner surface 13 of the intersecting interface of the elliptical head, the inner wall of the branch pipe 11 and the inner wall of the centering cover 5 form a gas protection chamber 10 .

Example 3:

As shown in Figure 4, the protection device of the present invention for gas-shielded welding of intersecting line welds on two elliptical head surfaces includes a gas control valve 9, a gas pipe 8, a conversion joint 7, a centering cover plate 5, and a gas guide Rod 4, supporting rib 2, sealing cover 1.

The protective gas flows in through the trachea 8, and a gas control valve 9 is provided at the entrance of the trachea 8 to control the flow and velocity of the protective gas. The air guiding rod 4 is tightly connected with the centering cover plate 5 through the eccentric sleeve 602 .

The connecting air guiding rod 4 is a hollow structure, and evenly distributed air outlet holes 402 are arranged on the pipe wall of the connecting gas guiding rod 4 to fill the protective gas in the connecting gas guiding rod 4 into the gas protection chamber 10; The net 401 is used to achieve a steady flow effect, so that the gas in the gas protection chamber 10 is evenly distributed.

The centering cover 5 is provided with evenly distributed exhaust holes 501, which can discharge overheated, ineffective or excessive gas in time; Fitted radially, the center line of the exhaust hole 501 coincides with the boundary of each stepped flange structure.

Referring to Fig. 3, the support rib 2 is a channel steel structure, and the sealing cover plate 1 is connected with the bottom of the support rib 2 through self-tapping screws 303; the lower end of the connecting air guide rod 4 and the support rib 2 are connected by universal joint 304. When in use, the sealing cover 1 is arranged below the interface of the intersecting line 13 between the two rotary surfaces of the elliptical head and the connecting pipe 14; wherein, the sealing cover 1 is an elliptical elastic and rollable copper alloy sheet, which can be adapted and covered with different curvatures The intersecting line interface of the radial elliptical head plays a role of relative sealing. The sealing cover 1 , the inner surface 13 of the intersecting interface of the elliptical head, the inner wall of the branch pipe 11 and the inner wall of the centering cover 5 form a gas protection chamber 10 .

Claims (25)

1. A protective device for gas shielded welding, characterized in that it comprises: Trachea, centering cover, even air guide rod, support ribs, sealing cover; The sealing cover plate is connected to the support rib, and the lower end of the connecting air guide rod is flexibly connected to the support rib; The connecting air guide rod is fixed with the centering cover plate through a fastening mechanism, and the connecting air guide rod is connected with the trachea; The connecting air guide rod is a hollow structure, and the pipe wall of the connecting air guide rod is provided with an air outlet; The centering cover plate is provided with an exhaust hole; The sealing cover is made of elastic material. 2. The protective device according to claim 1, wherein the elastic material is metal. 3. The protective device according to claim 2, characterized in that the metal is copper alloy, or stainless steel, or high carbon steel, or spring steel sheet. 4. The protection device according to claim 1, characterized in that: the sealing cover plate is oval or circular. 5. The protection device according to claim 1, wherein the sealing cover plate is concave. 6. The protection device according to claim 1, characterized in that: the sealing cover plate and the support rib adopt a detachable connection structure. 7. The protection device according to claim 6, wherein the detachable connection structure is a screw connection or a quick connector connection. 8. The protection device according to claim 7, characterized in that: the threaded connection is a bolt and nut connection, or a self-tapping screw connection. 9. The protection device according to claim 1, characterized in that: the support rib is in the shape of a groove. 10. The protection device according to claim 1, characterized in that: the lower end of the air guide rod is provided with a hinge hole, the support rib is provided with a hinge hole, and the hinge pin passes through the hinge hole of the support rib and connects the air guide rod. Hinge holes to form a hinged connection. 11. The protection device according to claim 1, characterized in that: the lower end of the connecting air rod is provided with a spherical body, and the supporting rib is provided with a ball socket, and the two form a spherical hinged connection. 12. The protective device according to claim 1, characterized in that: the lower end of the connecting air guide rod and the supporting rib are connected by a universal joint. 13. The protection device according to claim 1, characterized in that: a flow stabilizing layer is arranged inside the connecting air guide rod. 14. The protective device according to claim 13, characterized in that: the flow stabilizing layer is a wire mesh structure. 15. The protection device according to claim 1, characterized in that: the lower end surface of the centering cover plate is a stepped flange structure or an annular groove structure. 16. The protective device according to claim 15, characterized in that: the exhaust hole and each step boundary of the stepped flange structure, or the exhaust hole and each ring of the annular groove structure Slot boundaries partially coincide. 17. The protection device according to claim 1, characterized in that: the fastening mechanism is threaded connection, and the connecting air guide rod is an external thread structure, and is screwed with the external thread of the connecting air guide rod through a nut. 18. The protective device according to claim 1, characterized in that: the fastening mechanism is two eccentric sleeves which can be adjusted in phase and fit on the outer circle of the air guide rod. 19. The protection device according to claim 1, characterized in that: the fastening mechanism is an inner-wrapped multi-lobed embracing piece that fits on the outer circle of the connecting air guide rod. 20. The protective device according to claim 1, wherein the fastening mechanism is a C-shaped ring, and the C-shaped ring is sleeved on the outer circle of the connecting air guide rod. 21. The protection device according to claim 1, characterized in that: the fastening mechanism is an O-ring, and the O-ring is sleeved on the outer circle of the connecting air guide rod. 22. The protection device according to claim 1, characterized in that: the air pipe is provided with a gas control valve. 23. The protection device according to claim 1, characterized in that: the air pipe is connected to the air guide rod through a conversion joint. 24. The protective device according to claim 23, characterized in that at least one end of the conversion joint is a threaded pair, or a quick-release type connection interface, or an insertion clamp, or an insertion clamp. 25. The protective device according to claim 1, characterized in that: the trachea and the air guide rod are connected by a threaded pair, or a quick-release connector, or inserted into a clamp, or inserted into a throat clamp Way.

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