CN118492945A - Automatic welding equipment for stainless steel pipes - Google Patents

Abstract

The invention belongs to the technical field of stainless steel tube manufacturing, and particularly relates to automatic welding equipment for stainless steel tubes, which comprises a rack, an internal support preheating mechanism, a cleaning mechanism and a lifting welding mechanism, wherein the lifting welding mechanism is arranged above the tail part of the rack, a central support is arranged in the middle of the rack, the internal support preheating mechanism is arranged at one end of the central support far away from the lifting welding mechanism, the cleaning mechanism is arranged at one end of the central support close to the lifting welding mechanism, a compression roller module is arranged on the rack, and the type and the number of the compression roller module are determined by the specification of steel tubes. According to the invention, through the arrangement of the internal stay preheating mechanism, the stainless steel plate can be preheated before welding, the deformation of the pipe caused by welding can be reduced, and meanwhile, the welding seam can be cleaned before welding through the arrangement of the cleaning mechanism, so that the quality of the welding seam is improved.

Description

Automatic welding equipment for stainless steel pipes

Technical Field

The invention belongs to the technical field of stainless steel pipe manufacturing, and specifically refers to automatic welding equipment for stainless steel pipes.

Background Art

Stainless steel pipes can be basically divided into stainless steel welded pipes and stainless steel seamless pipes according to the production process. Stainless steel welded pipes are widely used in the production of stainless steel pipes because of their simple production process, high production efficiency, many varieties and specifications, and low equipment investment.

Stainless steel welded pipes are formed by welding steel coils. The slitting machine first divides the steel coils into set widths, and then unfolds the steel coils into steel plates. The rolling equipment then extrude the steel plates into set shapes, and finally the welding equipment welds the butt joints of the steel plates.

This production method has two disadvantages:

1. Stainless steel welding is cold welding, which is not suitable for products that require preheating of pipes before welding. The preheating temperature should be adjusted appropriately according to the pipe diameter and wall thickness, and is usually recommended to be around 300 degrees. Preheating can reduce welding stress, improve welding quality, and prevent cracks, deformation, etc.

2. During the welding process of stainless steel plates, the temperature of the weld seam of the welded pipe increases, and the internal stress of the pipe changes, which may cause the pipe to deform during welding. The larger the pipe diameter, the greater the probability of deformation. The common method is to adjust the welding parameters to the appropriate value. However, adjusting the welding parameters alone cannot completely eliminate the phenomenon of welding deformation.

3. During the rolling process of stainless steel plates, the welds of the steel plates may be contaminated by debris or other substances produced by extrusion. The current welding machines do not clean the welds of the steel plates before welding, which may affect the quality of the welds.

The above problems need to be improved.

Summary of the invention

In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an automatic welding equipment for stainless steel pipes. Through the setting of an internal support preheating mechanism, it can not only preheat the stainless steel plate before welding, but also reduce the deformation of the pipe caused by welding. At the same time, through the setting of a cleaning mechanism, the weld can be cleaned before welding to improve the quality of the weld.

The technical solution adopted by the present invention is as follows: The present invention proposes an automatic welding equipment for stainless steel pipes, comprising a stand, an internal support preheating mechanism, a cleaning mechanism and a lifting welding mechanism, wherein the lifting welding mechanism is arranged above the tail of the stand, and a central support is arranged in the middle of the stand, and the internal support preheating mechanism is arranged at one end of the central support away from the lifting welding mechanism, and the cleaning mechanism is arranged at one end of the central support close to the lifting welding mechanism, and the internal support preheating mechanism can provide support for the inner wall of the extruded steel pipe to prevent the steel pipe from deforming in subsequent welding operations, and the cleaning mechanism can clean the area to be welded after the steel pipe is extruded and before welding to prevent the welding quality from being affected by dirt, and a roller module is arranged on the stand, and the type and number of the roller module are determined by the specifications of the steel pipe, and a steel plate is conveyed in the middle of the roller module, and the steel plate passes through the roller module and is extruded into a pipe of a set shape by the roller module.

Furthermore, in order to avoid interference between the inner support preheating mechanism and the steel plate during the extrusion forming process, the inner support preheating mechanism is inserted into the extruded end of the steel plate from the open end of the steel plate, and the end of the inner support preheating mechanism away from the opening of the steel plate is beyond the lifting welding mechanism, so that it can support the formed steel pipe during welding. While the inner support preheating mechanism supports the inner wall of the steel pipe, the steel pipe also supports the inner support preheating mechanism to a certain extent in the reverse direction. The inner support preheating mechanism is relatively long, and the steel pipe can prevent the inner support preheating mechanism from being deformed in the length direction. ; The cleaning mechanism includes a motor, a cleaning ring and a sewage discharge support. The sewage discharge support is arranged in the middle of the stand in the area after the steel plate is extruded and formed. The cleaning ring is rotatably arranged on the side wall of the sewage discharge support. The motor is connected to the cleaning ring through a chain. The motor is fixed to one end of the central bracket close to the lifting welding mechanism. In order to enable the cleaning ring to better remove dirt on the surface of the pipe, a cleaning brush is arranged in a circular array on the inner side wall of the cleaning ring. The cleaning brush on the cleaning ring can brush the joints of the formed pipe under the action of the motor to prevent dirt and residue from affecting the welding quality.

Furthermore, the inner support preheating mechanism includes a front support mandrel, a preheating coil and a rear mandrel, the front support mandrel is in the shape of a curved tube, the curved tube end of the front support mandrel is penetrated on the central bracket, the horizontal end of the front support mandrel is penetrated in the extruded steel pipe, the preheating coil is arranged at the horizontal end of the front support mandrel, the preheating coil is connected with alternating current, the cable passes through the front support mandrel and is connected with external electrical equipment, the rear mandrel passes through the center of the preheating coil and is arranged in the front support mandrel, the position of the preheating coil is inside the pipe, and in the actual production process, the staff can adjust the preheating coil according to the pipe specifications and the actual situation. The field equipment layout needs to flexibly adjust the position of the preheating coil, such as increasing or decreasing the length of the front support core rod. The built-in preheating coil is not affected by the external equipment of the test stand and has a high degree of flexibility; the preheating coil includes an array of arc-surface cables, and a high-frequency changing current passes through the arc-surface cables. According to the right-hand rule of the law of electromagnetic induction, the high-frequency changing current will generate a high-frequency alternating magnetic field, causing the N pole and S pole of the magnetic field to continuously change in a direction perpendicular to the circumferential wall of the pipe, thereby causing a change in the magnetic flux, and ultimately generating an induced current inside the pipe, heating the pipe, and achieving the effect of preheating before welding.

Furthermore, the lifting welding mechanism includes a welding bracket, a pitch-adjusting slide, a pitch-adjusting screw, a spring and a welding gun head. The welding bracket is arranged at the tail end of the stand, the pitch-adjusting slide is arranged on the inner side wall of the welding bracket for sliding up and down, the pitch-adjusting screw penetrates the welding bracket and is rotatably arranged on the pitch-adjusting slide, the spring is sleeved on the pitch-adjusting screw, the spring is connected between the pitch-adjusting slide and the welding bracket, the welding gun head penetrates the welding bracket and is arranged on the pitch-adjusting slide, and the height of the pitch-adjusting slide can be adjusted by rotating the pitch-adjusting screw, thereby adjusting the distance between the welding gun head and the pipe extruded from the steel plate. During welding, the middle part of the pipe is filled with a rear core rod.

Furthermore, in order to remove the dirty debris cleaned by the cleaning mechanism and prevent the debris from secondary contamination of the pipe, a sewage outlet is provided under the sewage discharge support, and a chip discharge groove is arranged on the side wall of the cleaning ring. The debris swept away by the cleaning brush falls into the sewage outlet from the chip discharge groove and is discharged to the bottom of the pipe.

The beneficial effects achieved by the present invention using the above structure are as follows:

1. The front support mandrel can be inserted into the roll-formed steel pipe, which will not affect the rolling process of the steel plate, but can also support the inner wall of the steel pipe. When the lifting welding mechanism welds the steel pipe, it can provide a certain support force for the pipe and reduce the deformation caused by welding;

2. The preheating coil is connected between the front support mandrel and the rear mandrel. The steel pipe to be welded is sleeved outside the preheating coil. The preheating coil can heat the steel pipe by converting the current direction at high frequency, thereby achieving the effect of preheating the welding clamp and improving the welding quality.

3. The built-in preheating coil heating is highly flexible and can adjust the distance between the preheating station and the welding station according to the specifications of the pipe and the process requirements. The preheating position can be flexibly set and will not be restricted by external equipment;

4. The cleaning mechanism can clean the pipe in the welding clamp to prevent the dirt at the weld from affecting the welding quality;

5. The dirty waste residue generated by the cleaning mechanism can be discharged from the chip discharge groove and the sewage outlet, and will not move with the steel pipe to the welding position, preventing incomplete cleaning.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an automatic stainless steel pipe welding device proposed by the present invention;

FIG2 is a diagram showing the positional relationship between the inner support preheating mechanism, the cleaning mechanism, the lifting and welding mechanism and the steel plate;

FIG3 is a fracture view of a cross-sectional view of an inner support preheating mechanism;

FIG4 is an enlarged view of part I in FIG3 ;

FIG5 is a schematic diagram of the structure of a preheating coil;

FIG6 is a schematic diagram of the magnetic field distribution after the preheating coil is energized;

FIG7 is a schematic structural diagram of a lifting welding mechanism;

FIG8 is a position relationship diagram of the lifting welding mechanism during welding;

FIG9 is a cross-sectional view of the cooperation relationship between the cleaning ring and the sewage discharge support;

FIG10 is a schematic diagram of the structure of a sewage discharge support;

FIG. 11 is a schematic diagram of the structure of a cleaning ring.

Among them, 1. stand, 2. internal support preheating mechanism, 3. cleaning mechanism, 4. lifting welding mechanism, 5. pressure roller module, 6. central bracket, 7. motor, 8. chain, 9. cleaning ring, 10. sewage discharge support, 11. front support core rod, 12. preheating coil, 13. rear core rod, 14. arc surface wiring, 15. welding bracket, 16. pitch adjustment slide plate, 17. pitch adjustment screw, 18. spring, 19. welding gun head, 20. sewage outlet, 21. cleaning brush, 22. chip discharge groove.

In the above drawings, m represents a steel plate, N and S both represent magnetic poles of a magnetic field, and A represents an electric current.

The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

In the description of the present invention, it is necessary to understand that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

As shown in Figure 1, an automatic welding device for stainless steel pipes proposed by the present invention includes a stand 1, an inner support preheating mechanism 2, a cleaning mechanism 3 and a lifting welding mechanism 4. The lifting welding mechanism 4 is arranged above the tail of the stand 1, and a central support 6 is arranged in the middle of the stand 1. The inner support preheating mechanism 2 is arranged at one end of the central support 6 away from the lifting welding mechanism 4, and the cleaning mechanism 3 is arranged at one end of the central support 6 close to the lifting welding mechanism 4. The inner support preheating mechanism 2 can provide support for the inner wall of the extruded steel pipe to prevent the steel pipe from deforming in subsequent welding operations. The cleaning mechanism 3 can clean the area to be welded after the steel pipe is extruded and before welding to prevent the welding quality from being affected by dirt. A roller module 5 is provided on the stand 1. The type and number of the roller module 5 are determined by the specifications of the steel pipe. A steel plate m is conveyed in the middle of the roller module 5. The steel plate m passes through the roller module 5 and is extruded into a pipe of a set shape by the roller module 5.

As shown in Figures 1 and 2, in order to avoid interference between the inner support preheating mechanism 2 and the steel plate m during the extrusion forming process, the inner support preheating mechanism 2 is inserted into the extruded end of the steel plate m from the open end of the steel plate m, and the end of the inner support preheating mechanism 2 away from the opening of the steel plate m must extend beyond the lifting welding mechanism 4, so that it can support the formed steel pipe during welding. While the inner support preheating mechanism 2 supports the inner wall of the steel pipe, the steel pipe also supports the inner support preheating mechanism 2 to a certain extent in the reverse direction. The inner support preheating mechanism 2 is relatively long, and the steel pipe can prevent the inner support preheating mechanism 2 from generating deflection deformation in the length direction; the cleaning mechanism 3 includes a motor 7, a cleaning ring 9 and a sewage discharge support 10. The sewage discharge support 10 is arranged in the middle of the stand 1 in the area after the steel plate m is extruded, and the cleaning ring 9 is rotatably arranged on the side wall of the sewage discharge support 10. The motor 7 is connected to the cleaning ring 9 through a chain 8, and the motor 7 is fixed to the end of the central bracket 6 close to the lifting welding mechanism 4, as shown in Figures 9 and 11 As shown, in order to enable the cleaning ring 9 to better remove dirt from the surface of the pipe, a cleaning brush 21 is provided in a circular array on the inner wall of the cleaning ring 9. The cleaning brush 21 on the cleaning ring 9 can brush the joints of the formed pipe under the action of the motor 7 to prevent dirt and residue from affecting the welding quality.

As shown in Figures 3 to 6, the internal support preheating mechanism 2 includes a front support mandrel 11, a preheating coil 12 and a rear mandrel 13. The front support mandrel 11 is in the shape of a curved tube. The curved tube end of the front support mandrel 11 is penetrated on the central bracket 6. The horizontal end of the front support mandrel 11 is penetrated in the extruded steel pipe. The preheating coil 12 is arranged at the horizontal end of the front support mandrel 11. The preheating coil 12 is connected to an alternating current. The cable passes through the front support mandrel 11 and is connected to an external electrical device (not shown in the drawings). The rear mandrel 13 passes through the center of the preheating coil 12 and is arranged in the front support mandrel 11. The position of the preheating coil 12 is inside the pipe. In the actual production process, the staff can The position of the preheating coil 12 can be flexibly adjusted according to the specifications of the pipe and the needs of the on-site equipment layout, such as increasing or reducing the length of the front support core rod 11. The built-in preheating coil 12 is not affected by the external equipment of the stand 1 and has a high degree of flexibility; the preheating coil 12 includes an array-arranged arc-surface cable 14, and a high-frequency changing current A passes through the arc-surface cable 14. According to the right-hand rule of the law of electromagnetic induction, the high-frequency changing current A will generate a high-frequency alternating magnetic field, causing the N pole and the S pole of the magnetic field to continuously change in a direction perpendicular to the circumferential wall of the pipe, thereby causing a change in the magnetic flux, and finally generating an induced current A inside the pipe, and heating the pipe to achieve the effect of preheating before welding.

As shown in Figures 7 and 8, the lifting welding mechanism 4 includes a welding bracket 15, a pitch-adjusting slide 16, a pitch-adjusting screw 17, a spring 18 and a welding gun head 19. The welding bracket 15 is arranged at the tail end of the stand 1, and the pitch-adjusting slide 16 is arranged on the inner wall of the welding bracket 15 for sliding up and down. The pitch-adjusting screw 17 passes through the welding bracket 15 and is rotatably arranged on the pitch-adjusting slide 16. The spring 18 is sleeved on the pitch-adjusting screw 17. The spring 18 is connected between the pitch-adjusting slide 16 and the welding bracket 15. The welding gun head 19 passes through the welding bracket 15 and is arranged on the pitch-adjusting slide 16. By rotating the pitch-adjusting screw 17, the height of the pitch-adjusting slide 16 can be adjusted, thereby adjusting the distance between the welding gun head 19 and the pipe extruded from the steel plate m. During welding, the middle part of the pipe is filled with the rear core rod 13.

As shown in Figures 9 to 11, in order to remove the dirty debris cleaned by the cleaning mechanism 3 and prevent the debris from secondary contamination of the pipe, a sewage outlet 20 is provided under the sewage discharge support 10, and a chip discharge groove 22 is arranged in an array on the side wall of the cleaning ring 9. The debris swept by the cleaning brush 21 falls into the sewage outlet 20 from the chip discharge groove 22 and is discharged to the bottom of the pipe.

The specific working principle is as follows:

The steel plate m cut by the slitting machine is fed into the pressing roller module 5, and the pressing roller module 5 drives the steel plate m to move forward, and at the same time squeezes the steel plate m from a horizontal state into a set shape.

When the two side edges of the steel plate m have not yet been butted together and are in an open state, the two side edges of the steel plate m pass through the two sides of the front support core rod 11, and then the two side edges continue to roll toward each other under the extrusion of the roller module 5 until a closed tube is formed (at this time, there will be a certain interval at the joint of the tube waiting for welding). At this time, the tube will surround the horizontal end of the front support core rod 11 and the preheating coil 12. The front support core rod 11 is inserted into the inner cavity of the extruded tube without interfering with the steel plate m, and plays a certain supporting role in the inner cavity of the tube.

The pipe continues to move to the cleaning mechanism 3, the motor 7 is started, and the cleaning ring 9 is driven to rotate through the chain 8. The cleaning brush 21 on the cleaning ring 9 brushes the surface of the pipe and the gap to be welded, thereby achieving a cleaning effect on the welding area, improving the cleanliness of the area to be welded, and improving the welding quality. The removed dirty debris falls from the chip discharge groove 22 into the sewage outlet 20 and is discharged to the bottom of the stand 1.

The pipe continues to move. When the pipe moves to the position of the preheating coil 12, the external electrical equipment connected to the preheating coil 12 is started, and high-frequency alternating current is passed into the preheating coil 12, so that a high-frequency alternating magnetic field is generated in the area where the pipe is located, thereby heating the pipe here and achieving the effect of preheating before welding.

When the pipe is preheated, it moves to the bottom of the lifting welding mechanism 4, and the welding gun head 19 of the lifting welding mechanism welds the gap of the pipe to form the pipe. The height of the welding gun head 19 can be adjusted by the pitch adjusting screw 17. After the pitch adjusting screw 17 rotates, it drives the pitch adjusting slide 16 and the welding gun head 19 on the pitch adjusting slide 16 to move up and down, thereby realizing the change of the welding position.

After welding, the pipe continues to move to the rear end and is cut into the set length in the rear end process.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention.

The present invention and its embodiments are described above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims (9)

1. An automatic welding device for stainless steel pipes, characterized in that it comprises a stand (1), an inner support preheating mechanism (2), a cleaning mechanism (3) and a lifting welding mechanism (4), wherein the lifting welding mechanism (4) is arranged above the tail of the stand (1), a central support (6) is arranged in the middle of the stand (1), the inner support preheating mechanism (2) is arranged at one end of the central support (6) away from the lifting welding mechanism (4), the cleaning mechanism (3) is arranged at one end of the central support (6) close to the lifting welding mechanism (4), and a pressure roller module (5) is arranged on the stand (1); The inner support preheating mechanism (2) comprises a front support mandrel (11), a preheating coil (12) and a rear mandrel (13); the front support mandrel (11) is in the shape of a curved tube; the curved tube end of the front support mandrel (11) is penetrated on the central support (6); the horizontal end of the front support mandrel (11) is penetrated in an extruded steel tube; the preheating coil (12) is arranged at the horizontal end of the front support mandrel (11); and the rear mandrel (13) is penetrated through the center of the preheating coil (12) and is arranged in the front support mandrel (11). 2. The automatic welding equipment for stainless steel pipes according to claim 1 is characterized in that: the inner support preheating mechanism (2) penetrates into the extruded end of the steel plate from the open end of the steel plate, and the end of the inner support preheating mechanism (2) away from the opening of the steel plate is beyond the lifting welding mechanism (4). 3. The automatic stainless steel pipe welding equipment according to claim 2 is characterized in that: the preheating coil (12) includes an array of arc-shaped cables (14), and a high-frequency changing current flows inside the arc-shaped cables (14). 4. An automatic welding device for stainless steel pipes according to claim 3, characterized in that: the cleaning mechanism (3) comprises a motor (7), a cleaning ring (9) and a sewage discharge support (10), the sewage discharge support (10) is arranged in the middle of the stand (1) in the area after the steel plate is extruded, the cleaning ring (9) is rotatably arranged on the side wall of the sewage discharge support (10), and the motor (7) is connected to the cleaning ring (9) through a chain (8). 5. The automatic stainless steel pipe welding equipment according to claim 4, characterized in that the motor (7) is fixed to one end of the central bracket (6) close to the lifting welding mechanism (4). 6. The automatic welding equipment for stainless steel pipes according to claim 5, characterized in that a cleaning brush (21) is arranged in a circular array on the inner wall of the cleaning ring (9). 7. An automatic welding device for stainless steel pipes according to claim 6, characterized in that: the lifting welding mechanism (4) comprises a welding bracket (15), a pitch-adjusting slide plate (16), a pitch-adjusting screw rod (17), a spring (18) and a welding gun head (19), the welding bracket (15) is arranged at the tail end of the stand (1), the pitch-adjusting slide plate (16) is arranged on the inner side wall of the welding bracket (15) for sliding up and down, the pitch-adjusting screw rod (17) passes through the welding bracket (15) and is rotatably arranged on the pitch-adjusting slide plate (16), the spring (18) is sleeved on the pitch-adjusting screw rod (17), the spring (18) is connected between the pitch-adjusting slide plate (16) and the welding bracket (15), and the welding gun head (19) passes through the welding bracket (15) and is arranged on the pitch-adjusting slide plate (16). 8. The automatic stainless steel pipe welding equipment according to claim 7, characterized in that a sewage outlet (20) is provided below the sewage discharge support (10). 9. The automatic welding equipment for stainless steel pipes according to claim 8, characterized in that: a chip removal groove (22) is arranged in an array on the side wall of the cleaning ring (9).