Inside welder torch assembly

Abstract

The application relates to an inner welding machine welding gun assembly and belongs to the technical field of oil and gas pipeline welding. The welding gun assembly comprises a welding gun base, a welding gun sliding block, a gas cylinder, an edge searching sensor and a welding gun. The welding gun base comprises a first fixed plate, a second fixed plate, multiple guide shafts, a motor and a traction screw rod, the first fixed plate and the second fixed plate are parallel, and the two ends of the multiple guide shafts are connected with the first fixed plate and the second fixed plate respectively. The welding gun sliding block is provided with multiple guide through holes and a traction screw hole in one-to-one correspondence with the multiple guide shafts, and the traction screw rod is in threaded connection with the traction screw hole. The cylinder body of the gas cylinder is connected with the welding gun sliding block, and the telescopic rod of the gas cylinder is connected with the edge searching sensor. The edge searching sensor is electrically connected with the motor, and is used for measuring the distance from the pipeline end face. The welding gun is connected with the welding gun sliding block, and the connecting line between the welding end of the welding gun and the detection end of the edge searching sensor is parallel to the first fixed plate. By adopting the application, the welding gun can be prevented from being deflected, and the welding quality of the inner welding machine is improved.

Description

Technical Field

[0001] This application relates to the field of oil and gas pipeline welding technology, and in particular to an internal welding machine welding torch assembly. Background Technology

[0002] Currently, in the field of oil and gas pipeline welding, internal welding machines are mainly used for automatic welding to complete the welding of multiple pipeline sections. Pipelines that are about to be welded but not yet fixed are called "living pipes," while those that are about to be welded and already fixed are called "fixed pipes." Internal circumferential weld root welding is the first step in automatic welding and is crucial to determining the quality of the weld. When performing internal circumferential weld root welding, the welding torch of the internal welding machine must be aligned with the end face of the fixed pipe to ensure that misalignment does not occur.

[0003] Currently, technicians typically control the movement of the internal welding machine from outside the pipeline, using camera equipment to observe the relative position of the welding torch and the end face of the dead pipe, and manually align the welding torch with the end face of the dead pipe. This method has low efficiency and accuracy. Summary of the Invention

[0004] This application provides an internal welding machine welding torch assembly, which can solve the technical problems existing in related technologies. The technical solution is as follows: On one hand, this application provides an internal welding machine welding torch assembly, which includes a welding torch base, a welding torch slider, a cylinder, an edge-finding sensor, and a welding torch; The welding torch base includes a first fixed plate, a second fixed plate, multiple guide shafts, a motor, and a traction screw; the first fixed plate and the second fixed plate are parallel, the multiple guide shafts each have a columnar structure, the multiple guide shafts are located between the first fixed plate and the second fixed plate and are parallel to each other, and both ends of each guide shaft are connected to the first fixed plate and the second fixed plate respectively, the motor is connected to the side of the second fixed plate away from the first fixed plate, one end of the traction screw is connected to the output shaft of the motor, and the other end is located between the first fixed plate and the second fixed plate; The welding gun slider has a hexahedral structure and multiple guide through holes corresponding one-to-one with the multiple guide shafts. The first side of the welding gun slider has a traction threaded hole, which is parallel to the multiple guide shafts. The traction screw is located in the traction threaded hole and is threadedly connected to the traction threaded hole. The first side is the side of the welding gun slider that is close to the second fixing plate. The cylinder includes a cylinder body and a telescopic rod. The cylinder body is connected to the second side of the welding torch slider. One end of the telescopic rod is located in the cylinder body and is slidably connected to the cylinder body. The end of the telescopic rod away from the cylinder body is connected to the edge-finding sensor. The second side is the side of the welding torch slider that is adjacent to the first side. The edge-finding sensor is electrically connected to the motor, and the edge-finding sensor is used to measure the distance from the end face of the pipe; The welding torch is located on the third side of the welding torch slider and is connected to the welding torch slider. The line connecting the welding end of the welding torch and the detection end of the edge-finding sensor is parallel to the first fixed plate. The third side is the side of the welding torch slider that is adjacent to both the first side and the second side.

[0005] In one possible implementation, the plurality of guide shafts are all perpendicular to the first fixed plate, the first side is parallel to the first fixed plate, and the plurality of guide through holes and the traction threaded hole are all perpendicular to the first side.

[0006] In one possible implementation, there are two guide shafts and two guide holes.

[0007] In one possible implementation, the guide shaft and the guide through hole are clearance fit.

[0008] In one possible implementation, the traction screw is a ball screw.

[0009] In one possible implementation, the length of the portion of the traction screw located between the first fixing plate and the second fixing plate is a first value, the distance between the first fixing plate and the second fixing plate is a second value, and the distance between the first side and the fourth side of the welding gun slider is a third value. The first value is greater than the difference between the second value and the third value, wherein the fourth side is the side of the welding gun slider opposite to the first side.

[0010] In one possible implementation, the cylinder body is welded to the second side of the welding gun slider.

[0011] In one possible implementation, the welding torch assembly of the internal welding machine further includes a first hinge support and a second hinge support, both of which are fixedly connected to the second side of the welding torch slider; the edge-finding sensor includes a sensor body and a sensor seat, the sensor body and the sensor seat are connected, the sensor seat is hinged to the first hinge support, the end of the cylinder away from the telescopic rod is hinged to the second hinge support, and the end of the telescopic rod away from the cylinder is hinged to the sensor seat.

[0012] In one possible implementation, the motor includes a motor flange and a motor body. The motor flange is located on the side of the second fixing plate away from the first fixing plate and is connected to the second fixing plate. The motor body is located on the side of the motor flange away from the second fixing plate and is connected to the motor flange.

[0013] On the other hand, embodiments of this application provide an internal welding machine, which includes the welding gun assembly and controller described in the first aspect and its possible implementations; The internal welding machine is located inside the dead tube to be welded when it is in operation. The welding gun assembly of the welding machine is located at the opening of the dead tube to be welded. The welding end of the welding gun and the detection end of the edge-finding sensor are located outside the dead tube. The first fixing plate is perpendicular to the axis of the dead tube. The controller is electrically connected to the motor, the exhaust port of the cylinder, and the welding torch, respectively. The controller is used for: The telescopic end of the telescopic component is controlled to extend to a first preset extension length. The motor is controlled to drive the welding gun slider to move the welding gun and the edge-finding sensor toward the dead tube. When the detection signal of the edge-finding sensor determines that the distance between the detection end of the edge-finding sensor and the end face of the dead tube meets the preset condition, the motor is controlled to stop working and the telescopic end of the telescopic component is controlled to retract to a second preset extension length. When a welding command is received, the welding torch is controlled to perform automatic welding. The welding command is input after the movable tube and the fixed tube are connected.

[0014] The technical solutions provided by the embodiments of this application have at least the following beneficial effects: This application provides an internal welding machine welding torch assembly. In this assembly, a first fixed plate and a second fixed plate in the welding torch base are placed parallel to each other, and the welding torch slider is slidably connected to a guide shaft through a guide hole. A motor is connected to the second fixed plate, and the motor output shaft is connected to a traction screw. The traction screw is threadedly connected to the traction threaded hole of the welding torch slider. The line connecting the welding end of the welding torch and the detection end of the edge-finding sensor is parallel to the first fixed plate. The rotation of the motor controls the movement of the welding torch slider between the first and second fixed plates. The edge-finding sensor can detect the distance from the pipe end face. The rotation of the motor drives the welding torch slider to move between the first and second fixed plates. When the edge-finding sensor detects that it is in contact with the pipe end face, the motor stops rotating. At this time, the welding end of the welding torch is aligned with the pipe end face, and the welding torch then performs welding. This effectively avoids misalignment during welding, thereby improving the welding quality of the internal welding machine.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a welding torch assembly shown in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a welding torch base shown in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a welding torch assembly shown in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a welding torch assembly shown in an embodiment of this application.

[0018] Legend 1. Welding torch base; 11. First fixing plate; 12. Second fixing plate; 13. Guide shaft; 14. Motor; 141. Motor flange; 142. Motor body; 15. Traction screw; 2. Welding torch slider; 2a. First side; 2b. Second side; 2c. Third side; 2d, guide hole; 2e, traction threaded hole; 2f, fourth side surface; 3. Cylinder; 31. Cylinder body; 32. Telescopic rod; 4. Edge finding sensor; 4a. Detection end of edge finding sensor; 5. Welding torch; 5a. Welding end of the welding torch; 61. First hinge support; 62. Second hinge support. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0020] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0021] This application provides an internal welding machine welding torch assembly that enables the welding torch to be accurately positioned at the end face of the dead tube, avoiding off-center welding and thus improving welding quality.

[0022] Figure 1 This is a schematic diagram of the structure of a welding torch assembly shown in an embodiment of this application, as follows: Figure 1 As shown, the welding torch assembly includes a welding torch base 1, a welding torch slider 2, a cylinder 3, an edge-finding sensor 4, and a welding torch 5. Specifically: the welding torch base 1 includes a first fixing plate 11, a second fixing plate 12, multiple guide shafts 13, a motor 14, and a traction screw 15. The welding torch slider 2 includes multiple guide through holes 2d and traction threaded holes 2e. The cylinder 3 includes a cylinder body 31 and a telescopic rod 32. The line connecting the welding end 5a of the welding torch 5 and the detection end 4a of the edge-finding sensor 4 is parallel to the first fixing plate 11.

[0023] The following is a description of each part of the welding torch assembly.

[0024] 1. Welding torch base The welding torch base 1 is a component that fixes the welding torch assembly to the inner welding machine, and is also a component used to slide and connect the welding torch slider 2.

[0025] like Figure 2 As shown, the welding torch base 1 includes a first fixing plate 11, a second fixing plate 12, multiple guide shafts 13, a motor 14, and a traction screw 15.

[0026] First fixing plate 11 and second fixing plate 12 Both the first fixing plate 11 and the second fixing plate 12 have a plate-like structure. The thickness of the first fixing plate 11 and the second fixing plate 12 can be the same, for example, both d, or they can be different. The first fixing plate 11 and the second fixing plate 12 are placed parallel to each other, and the two opposite sides of the first fixing plate 11 and the second fixing plate 12 are respectively fixedly connected to the two ends of a plurality of guide shafts 13. The second fixing plate 12 has a fixing plate through hole, which can be circular or square in shape. The output shaft of the motor 14 and the traction screw 15 can be fixedly connected in the through hole. When the through hole is circular, its diameter is D1. In the internal welding machine, the first fixing plate 11 and the second fixing plate 12 can be fixedly connected to the dead tube expansion mechanism and the live tube expansion mechanism of the internal welding machine, respectively. The interval S between the first fixing plate 11 and the second fixing plate 12 can be set by the technician according to actual needs. For example, the interval S between the first fixing plate 11 and the second fixing plate 12 can be set to 10 times the thickness of the first fixing plate 11, that is, S=10d.

[0027] The first fixing plate 11 and the second fixing plate 12 can form a fixing plate assembly. The connection between the fixing plate assembly and the guide shaft 13 can be welding, bolt connection, etc.

[0028] The first fixing plate 11 and the second fixing plate 12 can be rectangular or circular, etc., and the shapes of the first fixing plate 11 and the second fixing plate 12 can be the same or different.

[0029] The first fixing plate 11 and the second fixing plate 12 can be made of various materials with good heat resistance, such as heat-resistant titanium alloy, high-speed steel or nickel-iron alloy.

[0030] Guide shaft 13 The welding torch base 1 includes multiple guide shafts 13, each guide shaft 13 having its two ends fixedly connected to a first fixing plate 11 and a second fixing plate 12, respectively. The multiple guide shafts 13 are parallel to each other. The multiple guide shafts 13 can all be at a certain angle to the fixing plate assembly, such as 60°, or they can all be perpendicular to the fixing plate assembly.

[0031] Multiple guide shafts 13 each have a columnar structure, and the guide shafts 13 can be cylindrical guide shafts or elliptical cylindrical guide shafts, etc. Multiple guide shafts 13 can have the same shaft diameter, or the shaft diameters of multiple guide shafts 13 can be different. The shaft diameter of the guide shaft 13 can be the same as the wall thickness of the first fixing plate 11, that is, the shaft diameter of the guide shaft 13 is d. The number of guide shafts 13 can be arbitrary, and technicians can set the number of guide shafts 13 in the welding torch base 1 according to actual needs.

[0032] Motor 14 The motor 14 is fixedly connected to the side of the second fixed plate 12 away from the first fixed plate 11, and the output shaft of the motor 14 is located in the through hole of the second fixed plate 12. The output shaft of the motor 14 is connected to the traction screw 15. When the motor 14 is working, the output shaft rotates, driving the traction screw 15 to rotate.

[0033] The connection between the motor 14 and the second fixing plate 12 can be either welding or bolting. Since it is often necessary to remove the motor 14 from the second fixing plate 12 during the inspection and maintenance of the welding gun assembly, bolts can be used to fix the motor 14 to the side of the second fixing plate 12 away from the first fixing plate 11.

[0034] Traction screw 15 The traction screw 15 is a component that drives the welding torch slider 2 to move between the first fixed plate 11 and the second fixed plate 12. The traction screw 15 is located between the first fixed plate 11 and the second fixed plate 12 and is connected to the output shaft of the motor 14. The traction screw 15 and the output shaft of the motor 14 can be fixedly connected by a coupling, or the traction screw 15 and the output shaft of the motor 14 can be provided with mutually cooperating grooves and protrusions respectively to make them snap together.

[0035] The shaft diameters of the traction screw 15 and the output shaft of the motor 14 can be D2 and D3 respectively, and D1, D2, and D3 can satisfy the following relationship: D1 > D3 > D2. Thus, when the output shafts of the traction screw 15 and the motor 14 are fixedly connected in the through hole of the fixing plate, when the motor 14 starts working and the output shafts of the traction screw 15 and the motor 14 rotate, the output shafts of the traction screw 15 and the motor 14 will not come into contact with the through hole. At the same time, since the torque on the driving bearing is greater than the torque on the driven bearing, making the shaft diameter of the driving shaft (output shaft of the motor 14) larger than the shaft diameter of the driven shaft (traction screw 15) can increase its service life.

[0036] The external thread of the traction screw 15 can be a fine thread or a round thread.

[0037] This reduces stress concentration at the root of the tooth. Furthermore, since the welding torch 5 uses gas shielded welding during automatic welding, the gas exerts a load on the welding torch slider 2. By setting the external thread of the traction screw 15 to a fine thread or a round thread, the traction screw 15 can be guaranteed to have good self-locking performance under load, preventing the welding torch slider 2 from moving between the first fixed plate 11 and the second fixed plate 12 during welding.

[0038] II. Welding torch slider 2 The welding torch slider 2 is a component that fixes the cylinder 3, the edge-finding sensor 4, and the welding torch 5. It is also used to adjust the positions of the edge-finding sensor 4 and the welding torch 5 within the welding torch base 1. The welding torch slider 2 includes multiple guide holes 2d and traction threaded holes 2e.

[0039] like Figure 3 As shown, the welding torch slider 2 has a hexahedral structure. The welding torch slider 2 is located between the first fixed plate 11 and the second fixed plate 12. The welding torch slider 2 includes six sides. Specifically, the first side 2a is the side of the welding torch slider 2 closest to the second fixed plate 12; the second side 2b is the side of the welding torch slider 2 adjacent to the first side 2a; the third side 2c is the side of the welding torch slider 2 adjacent to both the first side 2a and the second side 2b; and the fourth side 2f is the side of the welding torch slider 2 opposite to the first side 2a.

[0040] 2d guide hole The guide hole 2d is located on the first side 2a and the second side 2b of the welding gun slider 2. The welding gun slider 2 is slidably connected to the guide shaft 13 in the welding gun base 1 through the guide hole 2d.

[0041] The shape of the guide hole 2d is the same as that of the guide shaft 13. When the guide shaft 13 is a cylindrical guide shaft, the corresponding shape of the guide hole 2d is circular; when the guide shaft 13 is an elliptical cylindrical guide shaft, the corresponding shape of the guide hole 2d is elliptical. In addition, the number, size, and positional relationship of the guide holes 2d are the same as those of the guide shafts 13 in the welding torch base 1.

[0042] Traction threaded hole 2e The traction threaded hole 2e is located on the first side 2a of the welding gun slider 2 and has a structure that cooperates with the traction screw 15. The traction screw 15 is threadedly connected to the traction threaded hole 2e.

[0043] After the traction screw 15 is installed into the traction threaded hole 2e, the motor 14 starts working. The output shaft of the motor 14 rotates, driving the traction screw 15 to rotate. When the traction screw 15 rotates around the first direction of rotation, it gradually screws into the traction threaded hole 2e. Since the traction screw 15 is fixed in its axial direction, the welding torch slider gradually moves closer to the second fixed plate 12 as the traction screw 15 screws in. Similarly, when the traction screw 15 rotates around the second direction of rotation, it gradually screws out of the traction threaded hole 2e, and the welding torch slider gradually moves away from the second fixed plate 12 and closer to the first fixed plate 11 as the traction screw 15 screws out. In this way, by controlling the rotation of the output shaft of the motor 14, the position of the welding torch slider 2 between the first fixed plate 11 and the second fixed plate 12 can be controlled.

[0044] III. Cylinder 3 Cylinder 3 is a component used to raise or lower the edge-finding sensor 4.

[0045] like Figure 3 As shown, cylinder 3 includes cylinder body 31 and telescopic rod 32, which are slidably connected.

[0046] Cylinder block 31 The cylinder body 31 has a cylindrical structure and one end of the cylinder body 31 is open. The telescopic rod 32 can be inserted into the cylinder body 31 through the opening, and one end of the telescopic rod 32 is fixedly connected to the slider inside the cylinder body 31.

[0047] The outer wall of the cylinder body 31 is connected to the second side 2b of the welding gun slider 2. The connection between the cylinder body 31 and the welding gun slider 2 can be either hinged or welded.

[0048] Telescopic pole 32 The telescopic rod 32 has a round rod structure. One end of the telescopic rod 32 extends into the opening of the cylinder 31 and is fixedly connected to the cylinder 31 and the slider inside the cylinder 31. The other end is connected to the edge-finding sensor 4. The connection between the telescopic rod 32 and the edge-finding sensor 4 can be either welded or hinged.

[0049] The cylinder body 31 of cylinder 3 can be connected to the air supply tank of the internal welding machine via a pipeline, which can supply high-pressure gas into the cylinder body 31. When high-pressure gas is supplied to the cylinder body 31, the air pressure in the enclosed area of ​​the cylinder body 31 and the slider bracket increases, pushing the slider inside the cylinder body 31 towards the opening. During the movement of the slider towards the opening, the telescopic rod 32 pushes the edge-finding sensor 4 to lift until the slider moves to the opening, at which point the edge-finding sensor 4 is lifted to its highest position. When the edge-finding sensor 4 needs to be lowered, the cylinder body 31 discharges the high-pressure gas, the air pressure inside the cylinder body 31 decreases, the slider moves away from the opening, and the telescopic rod 32 pulls the edge-finding sensor 4 down.

[0050] IV. Edge-finding sensor 4 Edge finding sensor 4 is a component used to measure the distance from the end face of the pipe. Edge finding sensor 4 is electrically connected to motor 14.

[0051] like Figure 3 As shown, the edge-finding sensor 4 is connected to the third side 2c of the welding torch slider 2. When the connection between the telescopic rod 32 and the edge-finding sensor 4 is hinged, as... Figure 3As shown, the third side 2c of the welding torch slider 2 can have a hinge support, allowing the edge-finding sensor 4 to be hinged to the third side 2c of the welding torch slider 2. When the connection between the telescopic rod 32 and the edge-finding sensor 4 is welding, the third side 2c of the welding torch slider 2 can have a sliding limiting mechanism, which surrounds the side of the edge-finding sensor 4, allowing the edge-finding sensor 4 to be slidably connected to the third side 2c of the welding torch slider 2.

[0052] The edge-finding sensor 4 can use the detection end 4a to measure the distance from the pipe end face. When the detection end 4a is in contact with the pipe end face (the end face of a dead pipe, unless otherwise specified, the pipe end face in the following text refers to the end face of a dead pipe), the edge-finding sensor 4 sends a stop signal to the motor 14, causing the welding gun slider 2 to stop moving immediately at this time.

[0053] In one example, the edge-finding sensor 4 can be an infrared sensor. The detection end 4a can have an infrared light emitter and an infrared light receiver. The detection end 4a can calculate the distance between the detection end 4a and the pipe end face by emitting infrared rays and receiving infrared rays reflected from the pipe end face. When the calculated distance is greater than or equal to a first preset distance, the motor 14 rotates at a first speed, causing the welding torch slider 2 to move towards the second fixed plate 12 at a relatively fast speed. When the calculated distance is less than the first preset distance but greater than a distance threshold, the motor 14 rotates at a second speed, causing the welding torch slider 2 to move towards the second fixed plate 12 at a slower speed. When the calculated actual distance is less than or equal to the distance threshold, it can be considered that the detection end 4a is in contact with the pipe end face. At this time, the edge-finding sensor 4 sends a stop signal to the motor 14, causing the welding torch slider 2 to stop moving immediately.

[0054] The first preset distance can be a relatively large distance, such as 10mm. The distance threshold can be a relatively small value, such as 0.5mm. The first rotational speed is greater than the second rotational speed.

[0055] In another example, the edge-finding sensor 4 can be a contact sensor. The edge-finding sensor 4 can have an ammeter, and current flows through the detection end 4a. Thus, when the detection end 4a contacts the pipe end face, the current flowing through the detection end 4a changes, allowing detection of contact between the detection end 4a and the pipe end face. At this time, the edge-finding sensor 4 sends a stop signal to the motor 14, causing the welding torch slider 2 to stop moving immediately.

[0056] 5. Welding torches Welding torch 5 is a component used for welding. For example... Figure 3 As shown, the welding torch 5 is connected to the third side 2c of the welding torch slider 2, and the line connecting the welding end 5a of the welding torch 5 and the detection end 4a of the edge-finding sensor 4 is parallel to the first fixed plate 11.

[0057] In this way, firstly, high-pressure gas is supplied to cylinder 31 through the gas supply tank of the internal welding machine, lifting edge-finding sensor 4 and aligning its detection end 4a with the pipe end face. Then, by adjusting the position of welding torch slider 2 between the first fixed plate 11 and the second fixed plate 12, the detection end 4a is brought into contact with the pipe end face. When the detection end 4a is in contact with the pipe end face, edge-finding sensor 4 sends a stop signal to motor 14, causing welding torch slider 2 to stop moving immediately. Since the line connecting welding end 5a and detection end 4a of edge-finding sensor 4 is parallel to the first fixed plate 11, when detection end 4a is in contact with the pipe end face, welding end 5a is also in contact with the pipe end face. Finally, cylinder 31 discharges the high-pressure gas, edge-finding sensor 4 falls down, and the movable and fixed pipes are aligned and placed using a lifting device. Welding torch 5 then performs automatic welding, ensuring the welding torch is always aligned with the pipe end face, preventing misalignment and greatly improving the welding quality of the automatic welding.

[0058] The following section elaborates on some optional structural features of the welding torch assembly: Structural feature one, such as Figure 3 As shown, in the welding torch assembly, the multiple guide shafts 13 of the welding torch base 1 can all be perpendicular to the first fixed plate 11, the first side 2a of the welding torch slider 2 can be parallel to the first fixed plate 11, and the multiple guide through holes 2d and traction thread holes 2e can all be perpendicular to the first side 2a.

[0059] In this way, when the welding torch slider 2 slides between the first fixed plate 11 and the second fixed plate 12 via the guide shaft 13 to the first side surface 2a, the first side surface 2a can fit against the side of the first fixed plate 11 near the second fixed plate 12. Furthermore, the multiple guide holes 2d and the traction threaded holes 2e are all perpendicular to the first side surface 2a. During the sliding process, when the traction screw 15 is fully screwed into the traction threaded hole 2e, the welding torch slider 2 will not generate radial shear force on the guide shaft 13, which can improve the service life of the guide shaft 13.

[0060] Optionally, the number of guide shaft 13 and guide through hole 2d can both be two.

[0061] Technicians can set the number of guide shafts 13 and guide holes 2d according to actual needs. When there are two guide shafts 13 and two guide holes 2d, it can ensure that the welding gun slider 2 will not wobble during the sliding process, and the welding gun slider 2 can also have high overall strength.

[0062] Optionally, the guide shaft 13 and the guide hole 2d can be a clearance fit.

[0063] Since the welding gun slider 2 needs to slide frequently between the first fixed plate 11 and the second fixed plate 12, setting the fit between the guide shaft 13 and the guide through hole 2d as a clearance fit can reduce the wear caused by the relative sliding of the guide shaft 13 and the guide through hole 2d.

[0064] Optionally, a lubricating material may be provided between the guide shaft 13 and the guide hole 2d, such as lubricating oil.

[0065] This reduces the resistance when the welding gun slider 2 slides between the first fixed plate 11 and the second fixed plate 12.

[0066] The second structural feature is that the traction screw 15 can be a ball screw.

[0067] Since the traction screw 15 needs to be frequently screwed in and out of the traction threaded hole 2e, when using a regular screw, the traction screw 15 may experience problems such as stripping due to frequent screwing in and out, causing the traction screw 15 to get stuck in the traction threaded hole 2e. Setting the traction screw 15 as a ball screw can avoid the above problems and extend the service life of the traction screw 15.

[0068] The traction screw 15 can be machined using either chip-forming (cutting) or chip-free (plastic forming) methods. Chip-forming methods mainly include turning and whirl milling, while chip-free methods mainly include cold extrusion and cold rolling.

[0069] The third structural feature is that the following relationship can be satisfied between the traction screw 15, the first fixing plate 11 and the second fixing plate 12: the first length is greater than the difference between the second length and the third length.

[0070] The first length is the length of the portion of the traction screw 15 located between the first fixing plate 11 and the second fixing plate 12, the second length is the distance between the first fixing plate 11 and the second fixing plate 12, and the third length is the distance between the first side surface 2a and the fourth side surface 2f of the welding gun slider 2.

[0071] Thus, during the sliding process of the welding gun slider 2 from the fourth side 2f to the first fixed plate 11 to the first side to the second fixed plate 12, the traction screw 15 is always located in the traction threaded hole 2e, and the end face of the traction screw 15 away from the motor 14 will not be screwed out of the traction threaded hole 2e.

[0072] In this way, during the entire sliding process of the welding gun slider 2, the motor 14 can always adjust the position of the welding gun slider 2 by controlling different rotation directions.

[0073] Fourthly, the cylinder body 31 of the cylinder 3 and the welding gun slider 2 can have different connection methods.

[0074] Optionally, the wall surface of the cylinder body 31 near the welding gun slider 2 can be welded and fixed to the second side surface 2b of the welding gun slider 2.

[0075] Thus, after the cylinder body 31 is welded and fixed to the second side 2b of the welding torch slider 2, the edge-finding sensor 4 can be lifted by supplying high-pressure gas to the cylinder body 31 via the telescopic rod 32. When the edge-finding sensor 4 needs to be lowered, the cylinder body 31 discharges the high-pressure gas, the air pressure inside the cylinder body 31 decreases, the slider moves away from the opening, and the telescopic rod 32 pulls the edge-finding sensor 4 down.

[0076] Optionally, the cylinder 31 can be hinged to the second side 2b of the welding torch slider 2.

[0077] like Figure 4 As shown, the welding torch assembly of the internal welding machine also includes a first hinge support 61 and a second hinge support 62. Both the first hinge support 61 and the second hinge support 62 are fixedly connected to the second side 2b of the welding torch slider 2. The edge-finding sensor 4 includes a sensor body 41 and a sensor seat 42. The sensor body 41 and the sensor seat 42 are connected. The sensor seat 42 is hinged to the first hinge support 61. The end of the cylinder 31 away from the telescopic rod 32 is hinged to the second hinge support 62. The end of the telescopic rod 32 away from the cylinder 31 is hinged to the sensor seat 42.

[0078] In this way, high-pressure gas is delivered into cylinder 31, telescopic rod 32 extends out of cylinder 31, and sensor seat 42 rotates around first hinge support 61 toward third side 2c, simultaneously lifting sensor body 41 upward. After cylinder 31 discharges high-pressure gas, sensor seat 42 rotates around first hinge support 61 toward second side 2b, causing sensor body 41 to fall down. At the same time, both sensor seat 42 and cylinder 31 are in contact with second side 2b.

[0079] Fifthly, the motor 14 may include a motor flange 141 and a motor body 142, and the motor body 142 is connected to the second fixing plate 12 through the motor flange 141.

[0080] like Figure 4 As shown, the motor flange 141 is located on the side of the second fixing plate 12 away from the first fixing plate 11 and is connected to the second fixing plate 12. The motor body 142 is located on the side of the motor flange 141 away from the second fixing plate 12 and is connected to the motor flange 141.

[0081] In this way, the motor body 142 can be fixed to the motor flange 141 first, and then the motor flange 141 can be fixed to the second fixing plate 12. When repairing or replacing the motor body 142, it is only necessary to remove the motor body 142 from the motor flange 141, which is convenient. At the same time, the second fixing plate 12 will not be worn due to the removal of the motor body 142.

[0082] Using the welding torch assembly of this application, the first fixing plate 11 and the second fixing plate 12 in the welding torch base 1 are placed parallel to each other, and the welding torch slider 2 is slidably connected to the guide shaft 13 through the guide through hole 2d. The motor 14 is connected to the second fixing plate 12, and the output shaft of the motor 14 is connected to the traction screw 15. The traction screw 15 is threadedly connected to the traction threaded hole 2e of the welding torch slider 2. The line connecting the welding end 5a of the welding torch 5 and the detection end 4a of the edge-finding sensor 4 is parallel to the first fixing plate 11. The rotation of the motor 14 can control the movement of the welding torch slider 2 between the first fixing plate 11 and the second fixing plate 12. The edge-finding sensor 4 can detect the distance from the pipe end face. The motor 14 rotates and drives the welding gun slider 2 to move between the first fixed plate 11 and the second fixed plate 12. When the edge-finding sensor 4 detects that it is in contact with the pipe end face, the motor 14 stops rotating. At this time, the welding end 5a of the welding gun 5 is aligned with the pipe end face. After this, the welding gun 5 performs welding, which can effectively avoid misalignment and thus improve the welding quality of the internal welding machine.

[0083] This application also provides an internal welding machine, which includes the aforementioned internal welding machine welding gun assembly and controller.

[0084] When the internal welding machine is in operation, it is located inside the dead tube to be welded. The welding gun assembly of the welding machine is located at the pipe opening to be welded in the dead tube. The welding end 5a of the welding gun 5 and the detection end 4a of the edge-finding sensor 4 are located outside the dead tube. The first fixing plate 11 is perpendicular to the axis of the dead tube.

[0085] The controller is electrically connected to the motor 14, the exhaust port of the cylinder 31, and the welding torch 5. The controller is used to: control the extension end of the telescopic component to extend to a first preset extension length; control the motor 14 to drive the welding torch slider 2, which in turn moves the welding torch 5 and the edge-finding sensor 4 towards the dead tube; when the distance between the detection end 4a of the edge-finding sensor 4 and the end face of the dead tube meets a preset condition based on the detection signal of the edge-finding sensor 4, the motor 14 stops working, and the extension end of the telescopic component retracts to a second preset extension length. When a welding command is received, the welding torch 5 is controlled to perform automatic welding.

[0086] The "live pipe" refers to a pipe that is about to be welded but has not yet been welded and fixed, while the "dead pipe" refers to a pipe that is about to be welded and has already been welded and fixed. The welding command is input after the live pipe and the dead pipe are connected.

[0087] In implementation, after the detection signal from the edge-finding sensor 4 determines that the distance between the detection end 4a of the edge-finding sensor 4 and the end face of the dead pipe meets the preset condition, the controller will control the motor 14 to stop rotating, control the exhaust port of the cylinder 31 to open, and control the telescopic end of the telescopic component to retract to the second preset extension length, so that the edge-finding sensor 4 retracts back into the pipe. Then, the lifting device lifts the movable pipe, aligns the end face of the movable pipe with the end face of the dead pipe, and the controller sends a welding command to the welding torch 5 to control the welding torch 5 to perform automatic welding.

[0088] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A welding torch assembly for an internal welding machine, characterized in that, The welding torch assembly includes a welding torch base (1), a welding torch slider (2), a cylinder (3), an edge-finding sensor (4), a welding torch (5), a first hinge support (61), and a second hinge support (62). The welding torch base (1) includes a first fixing plate (11), a second fixing plate (12), multiple guide shafts (13), a motor (14), and a traction screw (15); the first fixing plate (11) is perpendicular to the axis of the dead tube, the first fixing plate (11) and the second fixing plate (12) are parallel, the multiple guide shafts (13) each have a columnar structure, the multiple guide shafts (13) are located between the first fixing plate (11) and the second fixing plate (12) and are parallel to each other, the multiple guide shafts (13) are perpendicular to the first fixing plate (11), and the two ends of each guide shaft (13) are respectively connected to the first fixing plate (11) and the second fixing plate (12), the motor (14) is connected to the side of the second fixing plate (12) away from the first fixing plate (11), one end of the traction screw (15) is connected to the output shaft of the motor, and the other end is located between the first fixing plate (11) and the second fixing plate (12); The welding gun slider (2) has a hexahedral structure. The welding gun slider (2) has multiple guide through holes (2d) that correspond one-to-one with the multiple guide shafts (13). The welding gun slider (2) is slidably connected to the guide shafts (13) through the guide through holes (2d) and is located between the first fixing plate (11) and the second fixing plate (12). The first side (2a) of the welding gun slider (2) has a traction thread hole (2e). The traction thread hole (2e) is parallel to the multiple guide shafts (13). The traction screw (15) is located in the traction thread hole (2e) and is threadedly connected to the traction thread hole (2e). The first side (2a) is the side of the welding gun slider (2) that is close to the second fixing plate (12). The cylinder (3) includes a cylinder body (31) and a telescopic rod (32). The cylinder body (31) is connected to the second side (2b) of the welding torch slider (2). One end of the telescopic rod (32) is located in the cylinder body (31) and is slidably connected to the cylinder body (31). The end of the telescopic rod (32) away from the cylinder body (31) is connected to the edge-finding sensor (4). The second side (2b) is the side of the welding torch slider (2) adjacent to the first side (2a). The edge-finding sensor (4) is electrically connected to the motor (14). The edge-finding sensor (4) is used to measure the distance from the end face of the pipe and to send a stop signal to the motor (14) when the detection end (4a) of the edge-finding sensor (4) is in contact with the end face of the pipe. The welding torch (5) is located on the third side (2c) of the welding torch slider (2) and is connected to the welding torch slider (2). The line connecting the welding end (5a) of the welding torch (5) and the detection end (4a) of the edge-finding sensor (4) is parallel to the first fixing plate (11). The third side (2c) is the side of the welding torch slider (2) that is adjacent to both the first side (2a) and the second side (2b). The first hinge support (61) and the second hinge support (62) are both fixedly connected to the second side (2b) of the welding gun slider (2); the edge-finding sensor (4) includes a sensor body (41) and a sensor seat (42), the sensor body (41) and the sensor seat (42) are connected, the sensor seat (42) is hinged to the first hinge support (61), the end of the cylinder (31) away from the telescopic rod (32) is hinged to the second hinge support (62), and the end of the telescopic rod (32) away from the cylinder (31) is hinged to the sensor seat (42); The telescopic rod (32) is used to push the edge-finding sensor (4) up to be flush with the end face of the pipe, or to drive the edge-finding sensor (4) to retract back into the pipe.

2. The welding torch assembly for the internal welding machine according to claim 1, characterized in that, The first side surface (2a) is parallel to the first fixing plate (11), and the plurality of guide through holes (2d) and the traction thread hole (2e) are perpendicular to the first side surface (2a).

3. The welding torch assembly for the internal welding machine according to claim 2, characterized in that, The number of guide shafts (13) and guide holes (2d) are both two.

4. The welding torch assembly for an internal welding machine according to claim 2 or 3, characterized in that, The guide shaft (13) and the guide through hole (2d) are clearance fit.

5. The welding torch assembly for an internal welding machine according to claim 1, characterized in that, The traction screw (15) is a ball screw.

6. The welding torch assembly for an internal welding machine according to claim 1, characterized in that, The length of the portion of the traction screw (15) located between the first fixing plate (11) and the second fixing plate (12) is a first value, the distance between the first fixing plate (11) and the second fixing plate (12) is a second value, and the distance between the first side (2a) and the fourth side (2f) of the welding gun slider (2) is a third value. The first value is greater than the difference between the second value and the third value, wherein the fourth side (2f) is the side of the welding gun slider (2) opposite to the first side (2a).

7. The welding torch assembly for an internal welding machine according to claim 1, characterized in that, The motor (14) includes a motor flange (141) and a motor body (142). The motor flange (141) is located on the side of the second fixing plate (12) away from the first fixing plate (11) and is connected to the second fixing plate (12). The motor body (142) is located on the side of the motor flange (141) away from the second fixing plate (12) and is connected to the motor flange (141).

8. An internal welding machine, characterized in that, The internal welding machine includes the internal welding gun assembly and controller as described in any one of claims 1-7; The internal welding machine is located in the dead tube to be welded when it is in operation. The welding gun assembly of the internal welding machine is located at the pipe opening to be welded in the dead tube. The welding end (5a) of the welding gun (5) and the detection end (4a) of the edge-finding sensor (4) are located outside the dead tube. The first fixing plate (11) is perpendicular to the axis of the dead tube. The controller is electrically connected to the exhaust port of the motor (14), the cylinder (31), and the welding torch (5), respectively. The controller is used for: The telescopic end of the telescopic component is extended to the first preset extension length. The motor (14) is controlled to drive the welding gun slider (2) to move the welding gun (5) and the edge-finding sensor (4) towards the dead tube. When the detection end (4a) of the edge-finding sensor (4) and the end face of the dead tube are determined to meet the preset conditions based on the detection signal of the edge-finding sensor (4), the motor (14) is controlled to stop working, and the telescopic end of the telescopic component is controlled to retract to the second preset extension length. When a welding command is received, the welding torch (5) is controlled to perform automatic welding. The welding command is input after the live tube and the dead tube are connected.

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