Arc pressure adjusting device for special surfacing welding machine for inner wall of long pipe

Abstract

The invention discloses an arc pressure adjusting device for a special surfacing welding machine for the inner wall of a long pipe, and relates to the technical field of surfacing welding, the arc pressure adjusting device comprises a base and an adjusting mechanism, the base is used for going deep into the long pipe, a sliding groove plate is fixed on the base, and an inclined groove is formed in the sliding groove plate; the adjusting mechanism comprises a swing connecting seat and a telescopic mechanism, one end of the swing connecting seat is hinged to the bottom of the base, and the other end of the swing connecting seat is connected with a welding gun. The telescopic mechanism is installed on the swing connecting base, the telescopic end of the telescopic mechanism is arranged in the inclined groove in a sliding mode, and an included angle is formed between the moving direction of the telescopic end and the inclination direction of the inclined groove. The arc pressure adjusting device is smaller in occupied space, can be placed in a long pipe for operation, and is simple in structure and high in arc pressure adjusting response speed.

Description

Technical Field

[0001] This invention relates to the field of surfacing welding technology, and in particular to an arc pressure regulating device for a special machine for surfacing welding the inner wall of long pipes. Background Technology

[0002] Oil and gas pipelines in the oil and gas industry typically require the inner wall of steel pipes to be overlaid with a corrosion-resistant layer of a certain thickness to extend the pipeline's service life. A long pipe inner wall overlay welding machine is a specialized piece of equipment used for overlay welding of the inner walls of pipelines.

[0003] Traditional long-pipe inner wall cladding welding machines employ a single tungsten electrode (TSE) welding process with a maximum welding speed of approximately 300 mm / min. To accommodate pipes with an inner diameter of 168 mm while maintaining welding quality, the arc voltage tracking mechanism is designed to be installed externally on the pipe, requiring a 16-meter-long transmission mechanism to achieve arc voltage adjustment, resulting in a slow real-time adjustment response speed. To improve welding efficiency, a dual tungsten electrode (DTE) welding process has emerged in this field. The arc voltage tracking response speed of the dual DTE process needs to be significantly improved compared to the single DTE process. Currently, commonly used dual DTE arc voltage adjustment devices are typically screw-module structures in a vertical configuration. This structure has a large spatial dimension and cannot be adapted to small-diameter pipe cladding tasks.

[0004] Therefore, it is necessary to design an arc voltage regulating device to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide an arc voltage adjustment device for a special machine for welding the inner wall of long pipes, so as to solve the problems existing in the prior art. It occupies less space, can be placed inside long pipes for operation, and has a simple structure and fast response speed for adjusting arc voltage.

[0006] An arc voltage adjustment device for a special machine for surfacing welding the inner wall of a long pipe includes a base and an adjustment mechanism. The base is for extending into the interior of the long pipe, and a sliding plate is fixed on the base. An inclined groove is provided on the sliding plate. The adjustment mechanism includes a swing connecting seat and a telescopic mechanism. One end of the swing connecting seat is hinged to the bottom of the base, and the other end of the swing connecting seat is connected to the welding torch. The telescopic mechanism is installed on the swing connecting seat, and the telescopic end of the telescopic mechanism is slidably disposed in the inclined groove, and the direction of movement of the telescopic end is at an angle to the inclination direction of the inclined groove.

[0007] In one embodiment, the telescopic mechanism includes a motor, a lead screw, and a nut. The rotational output shaft of the motor is fixedly connected to the lead screw, and the nut is threaded onto the lead screw. Under the action of the rotation limiting mechanism, the nut moves along the axial direction of the lead screw when the lead screw rotates. The nut is connected to a connecting member, which is movably disposed within the inclined groove.

[0008] As one embodiment, the rotation limiting mechanism includes a guide rail seat fixed on the swing connecting seat, the guide rail seat having a linear guide rail, and the nut being slidably disposed within the linear guide rail.

[0009] In one embodiment, the connector includes a roller, which is rotatably connected to the nut and is movably disposed within the inclined groove.

[0010] In one embodiment, the base has sliding groove plates facing each other on both sides, and rollers are connected to both sides of the nut.

[0011] As one embodiment, a water-cooling jacket is also provided on the guide rail base, the motor is installed inside the water-cooling jacket, the cooling surface of the water-cooling jacket is in contact with the surface of the motor, and water-cooling channels are provided in both the water-cooling jacket and the guide rail base.

[0012] In one embodiment, the welding torch is connected to the swing connector via an extension rod.

[0013] As one embodiment, at least two sets of the adjustment mechanisms are provided on the base along the extending direction of the base.

[0014] As one implementation, after installation, there is a height difference between the welding torches in the two adjustment mechanisms.

[0015] As one embodiment, the welding torch is a dual tungsten inert gas (TIG) welding torch.

[0016] Compared with the prior art, the present invention has the following technical effects: This invention features a telescopic mechanism on a long, narrow base, resulting in an overall long and narrow arc voltage adjustment device that is easy to insert into a long tube for welding and occupies less space. Furthermore, by incorporating a sliding plate with inclined grooves, the telescopic movement of the telescopic mechanism is converted into the swing of the swinging connecting seat, thereby raising or lowering the welding torch fixed to the end of the swinging connecting seat, adjusting the arc length in real time, and maintaining stable arc voltage. In addition, the welding torch is directly fixed to the swinging connecting seat, eliminating the need for a lengthy transmission chain and resulting in a faster response speed.

[0017] Compared with the prior art, other technical solutions of the present invention have the following technical effects: This invention protects the motor by incorporating a water-cooling jacket, and also provides a water-cooling channel within the guide rail base for its protection. The water-cooling jacket and the water-cooling channel within the guide rail base prevent the high temperatures that can easily occur during prolonged motor operation and when the swing connector is exposed to the molten welding pool for extended periods. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the arc voltage regulating device in one embodiment of the present invention; Figure 2 for Figure 1 Side view; Figure 3 This is a schematic diagram of the cooperation structure between the base and a set of adjustment mechanisms in one embodiment of the present invention (with one side of the slide plate removed). Figure 4 This is a schematic diagram of the flange seat and guide rail seat in one embodiment of the present invention; Figure 5 This is a schematic diagram of the water-cooling channel inside the guide rail seat in one embodiment of the present invention; Figure 6 This is a schematic diagram of the water cooling channel inside the flange seat in one embodiment of the present invention.

[0020] Figure label: 1. Base; 2. Slide plate; 21. Inclined groove; 3. Swing connecting seat; 4. Motor; 5. Lead screw; 6. Nut; 7. Guide rail seat; 71. Linear guide rail; 8. Roller; 9. Water cooling jacket; 10. Extension rod; 11. Double tungsten inert gas welding torch; 12. Mounting seat; 13. Motor seat; 14. Flange seat. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide an arc voltage adjustment device for a special machine for welding the inner wall of long pipes, so as to solve the problems existing in the prior art. It occupies less space, can be placed inside long pipes for operation, and has a simple structure and fast response speed for adjusting arc voltage.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1-6As shown, this embodiment provides an arc pressure adjustment device for a special machine for surfacing welding the inner wall of a long pipe, including a base 1 and an adjustment mechanism. In this embodiment, the base 1 is elongated and is formed by welding and / or bolting rods, which can penetrate deep into the interior of the long pipe. A sliding plate 2 is fixed on the base 1, and the sliding plate 2 is perpendicular to the extension direction of the base 1. An inclined groove 21 is provided on the sliding plate 2. The adjustment mechanism includes a swing connecting seat 3 and a telescopic mechanism. The swing connecting seat 3 is located in the extension direction of the sliding plate 2. One end of the swing connecting seat 3 is installed at the bottom of the base 1 through a mounting seat 12, and the other end of the swing connecting seat 3 is connected to the welding torch. The telescopic mechanism is installed on the swing connecting seat 3. The telescopic end of the telescopic mechanism moves approximately along the extension direction of the base 1 (the telescopic direction may have a certain angle with the extension direction of the base 1). The telescopic end of the telescopic mechanism is slidably disposed in the inclined groove 21, and the moving direction of the telescopic end has an angle with the inclined direction of the inclined groove 21.

[0025] In use, the base 1 is inserted into the long tube, and the welding torch is used to weld the inner wall of the long tube. After the telescopic mechanism moves, the telescopic end moves along the telescopic direction. Since the telescopic end is also located in the inclined groove 21, under the limiting action of the inclined groove 21, the telescopic end moves along the inclined groove 21. At the same time, the swing connecting seat 3 rotates around the hinge part between the swing connecting seat 3 and the base 1, so that the distance between the welding torch and the inner wall of the long tube changes, thereby adjusting the arc pressure.

[0026] In this embodiment, the arc voltage adjustment device is used in conjunction with the control system. Through information communication between the control system and the welding power source, the control system can collect the arc voltage (i.e., arc pressure) in real time during welding. The arc voltage is related to the arc length and the welding torch height (i.e., the distance between the tungsten electrode and the tube wall in the welding torch). In this embodiment, the control system can obtain the real-time arc length by collecting the arc voltage value in real time. It compares the real-time arc length with the preset reference arc length. If the difference between the real-time arc length and the reference arc length exceeds the set range, the control system drives the welding torch to rise and fall through the arc voltage adjustment device to keep the arc voltage and arc length within the set range.

[0027] The setting of the control system and its relationship with the function are things that can be confirmed by those skilled in the art based on their own skills, and this embodiment will not elaborate on them.

[0028] Therefore, by setting a telescopic mechanism on the elongated base 1, the arc voltage adjustment device is made into an elongated structure, which is convenient to be placed inside the long tube for welding and occupies less space. In addition, by setting a sliding plate 2 with a slanted groove 21, the telescopic movement of the telescopic mechanism can be converted into the swing of the swing connecting seat 3, thereby driving the welding torch fixed at the end of the swing connecting seat 3 to rise or fall (away from or near the inner wall of the long tube), adjusting the arc length in real time and maintaining the arc voltage stability. In addition, the welding torch is directly fixed on the swing connecting seat 3, eliminating the need for a long transmission chain and resulting in a faster response speed.

[0029] In this embodiment, the telescopic mechanism includes a motor 4, a lead screw 5, and a nut 6. The rotation output shaft of the motor 4 is fixedly connected to the lead screw 5. The nut 6 is threaded onto the lead screw 5. Under the action of the rotation limiting mechanism, the nut 6 moves along the axial direction of the lead screw 5 when the lead screw 5 rotates. The nut 6 is connected to a connecting piece, which is movably disposed in the inclined groove 21.

[0030] Specifically, in this embodiment, the rotation limiting mechanism includes a guide rail seat 7 fixed on the swing connecting seat 3, and a linear guide rail 71 on the guide rail seat 7. The nut 6 is slidably disposed within the linear guide rail 71. Under the limiting action of the linear guide rail 71, when the lead screw rotates, the nut 6 cannot rotate and can only slide within the linear guide rail 71.

[0031] In this embodiment, the connecting component includes a roller 8, which is rotatably connected to a nut 6. The roller 8 rotates as it moves along the inclined groove 21, reducing the friction between it and the inclined groove 21.

[0032] In this embodiment, sliding groove plates 2 are arranged opposite each other on both sides of the base 1, and rollers 8 are connected to both sides of the nut 6. The symmetrical arrangement of rollers 8 on both sides of the nut 6 can make the force on both sides of the nut 6 even and improve the stability of the movement of the nut 6.

[0033] In this embodiment, a water-cooling jacket 9 is also provided on the guide rail base 7. The motor 4 is installed inside the water-cooling jacket 9, and the cooling surface of the water-cooling jacket 9 is in contact with the surface of the motor 4. A water-cooling channel is provided inside the water-cooling jacket 9. In this embodiment, by providing the water-cooling jacket 9, the motor 4 can be protected. In addition, a water-cooling channel is also provided inside the guide rail base 7 in this embodiment, which can protect the guide rail base 7. After the water-cooling jacket 9 and the water-cooling channel are provided inside the guide rail base 7, the high temperature problems that are prone to occur when the motor 4 operates for a long time and the swing connecting seat 3 is exposed to the welding pool for a long time can be avoided.

[0034] Specifically, in this embodiment, the guide rail seat 7 is also provided with a motor seat 13 and a flange seat 14. The motor seat 13 is used to fix the tail end of the motor 4, and the flange seat 14 is used to connect the flange end of the motor 4. After the motor seat 13 and the flange seat 14 fix the two ends of the motor 4, it helps to ensure the stable operation of the motor 4.

[0035] In this embodiment, the flange seat 14 and the guide rail seat 7 can be configured as an integral structure.

[0036] The flange seat 14 and / or guide rail seat 7 are provided with water inlets and outlets. Furthermore, the water-cooling jacket 9, motor seat 13, flange seat 14, and guide rail seat 7 all have interconnected water-cooling channels. When machining the water-cooling channels, holes are typically drilled directly into the surfaces of the water-cooling jacket 9, motor seat 13, flange seat 14, or guide rail seat 7, with multiple holes connected to form the water-cooling channels. Then, some of the holes are sealed, leaving the remaining two holes as the water inlet and outlet, respectively.

[0037] In this embodiment, the welding torch is connected to the swing connector 3 via an extension rod 10. In some long pipes with large diameters, the extension rod 10 can be tilted towards the pipe wall to bring the welding torch closer to the pipe wall.

[0038] In this embodiment, at least two sets of adjustment mechanisms are provided on the base 1 along its extension direction. The height difference between the welding torches in the two sets of adjustment mechanisms after installation is 15mm (this height difference, as well as the highest and lowest points mentioned above, are based on the pipe wall and refer to the distance between the welding torch head and the pipe wall). In this embodiment, the adjustment mechanisms are all fixed to the base 1 by the mounting base 12 and the sliding plate 2; during installation, the height difference between the two sets of adjustment mechanisms can be adjusted by adjusting the installation height of the mounting base 12 and the sliding plate 2 on the base 1. By setting two or more sets of adjustment mechanisms, multiple layers of pipe wall can be welded simultaneously, improving welding efficiency.

[0039] In this embodiment, the welding torch is a dual tungsten electrode welding torch 11.

[0040] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0041] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes, characterized in that, include: A base for extending into the interior of a long tube, a sliding plate fixed on the base, and an inclined groove provided on the sliding plate; The system also includes an adjustment mechanism, which comprises a swing connecting seat and a telescopic mechanism. One end of the swing connecting seat is hinged to the bottom of the base, and the other end of the swing connecting seat is connected to the welding torch. The telescopic mechanism is mounted on the swing connecting seat, and the telescopic end of the telescopic mechanism is slidably disposed in the inclined groove, with the moving direction of the telescopic end forming an angle with the inclination direction of the inclined groove.

2. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 1, characterized in that, The telescopic mechanism includes a motor, a lead screw, and a nut. The rotating output shaft of the motor is fixedly connected to the lead screw, and the nut is threaded onto the lead screw. Under the action of the rotation limiting mechanism, the nut moves along the axial direction of the lead screw when the lead screw rotates. The nut is connected to a connecting member, which is movably disposed within the inclined groove.

3. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 2, characterized in that, The rotation limiting mechanism includes a guide rail seat fixed on the swing connecting seat, the guide rail seat having a linear guide rail, and the nut being slidably disposed within the linear guide rail.

4. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 2, characterized in that, The connector includes a roller, which is rotatably connected to the nut and is movably disposed within the inclined groove.

5. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 4, characterized in that, The base has sliding groove plates on both sides facing each other, and rollers are connected to both sides of the nut.

6. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 2, characterized in that, The guide rail base is also provided with a water cooling jacket, the motor is installed in the water cooling jacket, the cooling surface of the water cooling jacket is in contact with the surface of the motor, and water cooling channels are provided in both the water cooling jacket and the guide rail base.

7. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 1, characterized in that, The welding torch is connected to the swing connector via an extension rod.

8. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to any one of claims 1-7, characterized in that, Along the extension direction of the base, at least two sets of the adjustment mechanisms are provided on the base.

9. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 8, characterized in that, After installation, there is a height difference between the welding torches in the two adjustment mechanisms.

10. The arc voltage regulating device for a special machine for surfacing welding the inner wall of long pipes according to claim 8, characterized in that, The welding torch is a dual tungsten inert gas (TIG) welding torch.

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