A welding device for a stress sensing element

Abstract

A welding device of a stress sensing element, comprising: a workbench, a welding machine and a smoke purifier, the workbench and the smoke purifier are communicated through an exhaust pipe; a workbench is arranged in the workbench and a welding gun sliding rail extending horizontally along the length direction of the workbench is arranged above the workbench; a first chuck and a second chuck are arranged oppositely on the workbench, the first chuck and the second chuck can rotate around their own axes, a first clamp tool for fixing a coil pipe of an oil pipeline is detachably arranged on the first chuck, a third clamp tool for fixing a connector or a sealing special-shaped pipe is detachably arranged on the second chuck; a second clamp tool for fixing a straight pipe of the oil pipeline is arranged between the first chuck and the second chuck; a welding gun assembly movable along the welding gun sliding rail is arranged on the welding gun sliding rail, the welding gun assembly comprises a welding gun with adjustable position up and down and adjustable angle. The present application can realize automatic welding of high-pressure resistant stress sensor, has good welding effect and high production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of automated production equipment technology, and specifically relates to a welding device for stress sensing elements. Background Technology

[0002] Figure 1 This is a schematic diagram of the structure of a stress sensing element. Figure 1 As shown, the stress sensing element includes a sealed shaped tube 100, an oil delivery pipe 101, and a connector 102. The sealed shaped tube 100 is a sealed structure filled with oil. The sealed shaped tube 100 is connected to the connector 102 via the oil delivery pipe 101. This stress sensing element is used to test the coal seam compression pressure in coal mines. It is installed 9-15 meters deep into the coal seam, inside stress observation holes in the mine roadways, to monitor the dynamic changes in stress and pressure of the strata during production operations, understand the strata structure and stress distribution, and provide early warnings of abnormal strata conditions, thus ensuring the safety of coal mine operations.

[0003] The coal seam compression pressure value detected by this type of stress sensing element is transmitted to the data equipment through connector 102, which is connected to the oil pipeline 101 and the sealed shaped tube 100. Depending on the application requirements, the oil pipeline 101 has a small diameter and a long length, typically using a stainless steel pipe with an outer diameter of 4mm and a wall thickness of 1mm, with a length of 9–15 meters. Because the wall of the oil pipeline 101 is very thin, welding the oil pipeline 101, connector 102, and sealed shaped tube 100 together requires highly skilled welding techniques. Currently available automated welding robots or manual welding cannot meet the welding technology requirements of this stress sensing element. Summary of the Invention

[0004] The purpose of this invention is to provide a welding device for stress sensing elements used in coal mines to test the extrusion pressure of coal seams.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A welding apparatus for a stress sensing element, the stress sensing element comprising a sealed shaped tube, a connector, and an oil supply pipe connecting the sealed shaped tube and the connector; the welding apparatus comprising a work cabinet, an electric welding machine, and a fume purifier, the work cabinet and the fume purifier being connected via an exhaust pipe; the work cabinet is provided with a worktable and a welding torch slide rail extending horizontally along the length of the worktable, positioned above the worktable; a first chuck and a second chuck are provided on the worktable, the first chuck and the second chuck being rotatable about their own axes, the first chuck being detachably provided with a first clamping fixture for fixing the oil supply pipe coil, and the second chuck being detachably provided with a third clamping fixture for fixing the connector or the sealed shaped tube; a second clamping fixture for fixing a straight section of the oil supply pipe is provided between the first chuck and the second chuck; a welding torch assembly movable along the welding torch slide rail is provided, the welding torch assembly comprising a welding torch whose position and angle are adjustable.

[0007] In some embodiments, the first chuck and the second chuck are pneumatic rotary chucks.

[0008] In some embodiments, the first clamping fixture includes a fixed frame, a pipe-laying plate disposed on the fixed frame, and two coil clamps centrally symmetrically disposed on the pipe-laying plate; the fixed frame is provided with a cylindrical first clamping part held by the first chuck, and the coil clamps include a pressing plate pressing on the outer ring of the oil pipeline coil, with the oil pipeline coil located between the pressing plates.

[0009] In some embodiments, the coil clamp includes a base disposed on the tube-laying plate, a handle connected to the base via a pin, and a linkage rod with one end hinged to the handle and the other end hinged to a connecting rod. The base is provided with a limiting part for restricting the connecting rod to move horizontally only along its own axis. The connecting rod passes through the limiting part and both ends protrude outside the limiting part. The end of the connecting rod away from the handle is connected to the clamping plate. The handle is located inside the tube-laying plate relative to the clamping plate.

[0010] In some embodiments, the handle is a T-shaped or L-shaped handle.

[0011] In some embodiments, the limiting part is a hollow cylindrical shape.

[0012] In some embodiments, the outer peripheral surface of the end of the connecting rod connected to the pressure plate is machined with external threads, the pressure plate is provided with threaded holes, and the pressure plate and the connecting rod are connected by threads and locked by a lock nut.

[0013] In some embodiments, the second clamping fixture includes a clamping seat disposed on the worktable, a bracket disposed on the top of the clamping seat, a connecting rod handle disposed on the bracket via a pin, and a pressure rod disposed at one end of the connecting rod handle; the top of the clamping seat is provided with a straight tube placement part, the straight tube placement part is provided with a placement groove, and the pressure rod is located above the placement groove.

[0014] In some embodiments, the third clamping fixture includes a clamping body, a clamping shaft, an interceptor, and an adjusting handle; the clamping body is provided with a connector placement groove, a cylindrical second clamping part held by the second chuck, and an extension protruding from the clamping body, the extension is provided with a through groove extending to the connector placement groove, the clamping shaft and the connector are disposed in the through groove, one end of the connector is hinged to the clamping shaft and the other end is hinged to the adjusting handle, the other end of the adjusting handle extends out of the through groove, and the clamping shaft can extend into the connector placement groove.

[0015] In some embodiments, the welding torch assembly further includes a lifting cylinder disposed on the welding torch slide rail, an adapter frame connected to the piston rod of the lifting cylinder, and a welding torch mounting plate disposed on the adapter frame. The welding torch is disposed on the welding torch mounting plate, and the mounting height of the welding torch mounting plate on the adapter frame is adjustable. The welding torch mounting plate is provided with an arc-shaped mounting groove, and the angle of the welding torch can be adjusted along the mounting groove.

[0016] As can be seen from the above technical solution, this invention addresses the structure of a high-pressure stress sensing element used for detecting coal seam extrusion pressure. It incorporates a corresponding fixture that can quickly and effectively fix the workpiece, ensuring stable clamping during welding to prevent it from falling or loosening. This effectively improves welding quality and reduces the defect rate. During welding, the chuck rotates the fixture, allowing the welding torch to stably and effectively complete the welding of the workpiece. This solves the problem of weld penetration and blockage caused by thin walls and unusual shapes of the workpiece, meeting the technical requirements of high pressure resistance and high sensitivity for stress sensing elements. This invention enables automated welding of stress sensors used for testing coal seam extrusion pressure in coal mines, eliminating tedious manual welding, saving production costs, and improving production efficiency. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying 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.

[0018] Figure 1This is a schematic diagram of the structure of a high-pressure stress-resistant sensing element;

[0019] Figure 2 This is a schematic diagram of the welding apparatus according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal components of the work cabinet according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the first clamping fixture in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the first clamping fixture from another angle according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the oil pipeline coil clamp in the loosened state according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the welding torch assembly according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the second clamping fixture according to an embodiment of the present invention;

[0026] Figure 9 This is a schematic diagram of the second clamping fixture from another angle according to an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of the welding device used in an embodiment of the present invention for welding an oil pipeline and a sealed shaped pipe;

[0028] Figure 11 This is a schematic diagram of the structure of the third clamping fixture in an embodiment of the present invention;

[0029] Figure 12 This is a cross-sectional view of the third clamping fixture according to an embodiment of the present invention;

[0030] Figure 13 This is a schematic diagram of the third clamping fixture in the loosened state according to an embodiment of the present invention;

[0031] Figure 14 This is a schematic diagram of the clamping fixture in the clamping state according to the third embodiment of the present invention.

[0032] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, for ease of explanation, the drawings illustrating the device structure will be partially enlarged, not according to general proportions. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of the present invention. It should be noted that the drawings are simplified and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of the present invention. Additionally, in the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Terms such as "positive," "negative," "bottom," "upper," "lower," "front," "rear," "left," and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, not indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] like Figure 2 As shown, the stress sensing element welding device of this embodiment includes a work cabinet 1, a fume purifier 2, an electric welding machine 3, an exhaust pipe 4, and a welding fixture assembly. The welding torch and welding fixture assembly are disposed in the work cabinet 1, which is connected to the fume purifier 2 via the exhaust pipe 4. Toxic fumes generated during welding can be discharged to the fume purifier 2 through the exhaust pipe 4. In this embodiment, the electric welding machine 3 is disposed on the top of the work cabinet 1. The work cabinet 1 forms a sealed space, which can prevent operators from being injured by electric arc light and high temperature.

[0036] The work cabinet 1 is equipped with a workbench 1-1 and a welding torch slide rail 1-2. For example... Figure 3 As shown, a welding fixture assembly is provided on the worktable 1-1, and a welding torch slide rail 1-2 is located above the worktable 1-1 and extends horizontally along the length of the worktable 1-1. The welding torch assembly is mounted on the welding torch slide rail 1-2 and can move along the welding torch slide rail 1-2.

[0037] The welding fixture assembly of this embodiment includes a first chuck 5, a second chuck 6, a first clamping fixture 7, a second clamping fixture 8, and a third clamping fixture 9. The first chuck 5 and the second chuck 6 are spaced apart on the worktable 1-1 and arranged opposite to each other. The first chuck 5 is used to mount the first clamping fixture 7, and the second chuck 6 is used to mount the third clamping fixture 9 or the sealing shaped tube 100. In this embodiment, both the first chuck 5 and the second chuck 6 are pneumatic rotary chucks, clamping the clamping fixture or the sealing shaped tube pneumatically. Both the first chuck 5 and the second chuck 6 can rotate around their own axial direction. During welding, the first chuck 5 and the second chuck 6 rotate synchronously.

[0038] The oil pipeline 102 is quite long. To facilitate storage, it is usually coiled up to form a coil. However, to facilitate welding, a section of the oil pipeline is pulled out at both ends during welding. The pulled-out section is a straight pipe.

[0039] The first clamping fixture 7 is used to fix the oil pipeline coil. The first clamping fixture 7 is mounted on the first chuck 5, fixed by the first chuck 5, and rotated together with the first chuck 5. Figure 4 and Figure 5 As shown, the first clamping fixture 7 in this embodiment includes a fixing frame 7-1, a pipe-laying plate 7-2, and a coil clamp 7-3. The fixing frame 7-1 has a columnar first clamping part 7-1a, and the first chuck 5 clamps the first clamping part 7-1a, thereby installing the first clamping fixture 7 onto the first chuck 5. The pipe-laying plate 7-2 is disposed on the fixing frame 7-1 and is used to place the oil pipeline coil. A pair of centrally symmetrically arranged coil clamps 7-3 are provided on the pipe-laying plate 7-2. The coil clamps 7-3 are used to fix the oil pipeline coil placed on the pipe-laying plate 7-3, so that the oil pipeline coil will not shift when the first clamping fixture 7 rotates with the first chuck 5.

[0040] The coil clamp 7-3 in this embodiment includes a clamping plate 7-31, a connecting rod 7-32, a linkage rod 7-33, a handle 7-34, and a base 7-35. The base 7-35 is fixed to the coil plate 7-2. The handle 7-34 is a T-shaped or L-shaped handle, connected to the base 7-35 via a pin, and can rotate around the pin. One end of the linkage rod 7-33 is hinged to the handle 7-34, and the other end is hinged to the connecting rod 7-32. A limiting part 7-35a is provided on the base 7-35 to limit the connecting rod 7-32, allowing it to move horizontally only along its own axis. The limiting part 7-35a and the handle 7-34 are arranged opposite to each other. In this embodiment, the limiting part 7-35a is a hollow cylindrical shape, through which the connecting rod 7-32 can pass, with both ends protruding outside the limiting part 7-35a. In other embodiments, the limiting part 7-35a can also be a groove. The other end of the connecting rod 7-32 is connected to the clamping plate 7-31. The clamping plate 7-31 is outside the handle 7-34, so that it can press against the outer periphery of the tubing coil. The handle 7-34 is located inside the tubing plate 7-2 relative to the clamping plate 7-31, closer to the center of the tubing plate 7-2. Both the base 7-35 and the handle 7-34 are inside the tubing coil and do not affect the placement of the tubing coil.

[0041] In this embodiment, the outer circumferential surface of the end connecting the connecting rod 7-32 and the clamping plate 7-31 is machined with external threads, and the clamping plate 7-31 is machined with threaded holes. The clamping plate 7-31 and the connecting rod 7-32 are connected by threads and locked by a lock nut 7-35. The external threads on the connecting rod 7-32 also serve to adjust the installation position of the clamping plate 7-31 on the connecting rod 7-32, which can accommodate oil pipe coils with different outer diameters. Multiple threaded holes can also be provided on the clamping plate 7-31 in the vertical direction to adjust the installation height of the clamping plate 7-31, thereby accommodating different heights of oil pipe coils. The more turns the oil pipe coil has and the higher it is, the installation height of the clamping plate can be adjusted by using different threaded holes on the connecting rod and the clamping plate, improving versatility.

[0042] Reference Figure 5 and Figure 6 When the handle 7-34 rotates around the pin between itself and the base 7-35, it can drive the linkage rod 7-33, which is hinged to it, to move. The linkage rod 7-33 further drives the connecting rod 7-32, which is hinged to it, to move. The connecting rod 7-32 is limited by the limiting part 7-35a and can only move horizontally. When the connecting rod 7-32 moves horizontally, it drives the clamping plate 7-31 to move horizontally together. The clamping plates 7-31 of the two sets of coil clamps 7-3, which are arranged opposite each other, can move towards each other under the control of the handle 7-34, clamping the oil pipe coil (such as...) located between the clamping plates 7-31. Figure 3 ( ), or move away from each other, loosening the oil pipe coil between clamping plates 7-31. For example, such as Figure 6As shown, when the handle 7-34 rotates away from the limiting part 7-35a about the pin axis between it and the base 7-35, it drives the linkage rod 7-33, which is hinged to it, away from the limiting part 7-35a. The linkage rod 7-33 further drives the connecting rod 7-32 to move in the horizontal direction, so that the clamping plate 7-31 connected to the connecting rod 7-32 presses the outer periphery of the oil pipeline coil, thereby fixing the oil pipeline coil.

[0043] like Figure 2 and Figure 7 As shown, the welding torch assembly of this embodiment includes a welding torch 10, an adapter frame 11, a lifting cylinder 12, and a welding torch mounting plate 13. The lifting cylinder 12 is mounted on the welding torch slide rail 1-2 and can slide along the rail 1-2, thereby adjusting the lateral position (horizontal position) of the welding torch 10 within a large range. The piston rod of the lifting cylinder 12 is connected to the adapter frame 11. When the lifting cylinder 12 is activated, it can drive the adapter frame 11 to move up and down, thereby adjusting the longitudinal position (height position) of the welding torch 10. The welding torch 10 is mounted on the welding torch mounting plate 13, and the welding torch mounting plate 13 is mounted on the adapter frame 11.

[0044] In this embodiment, the welding torch mounting plate 13 and the adapter frame 11 are connected by threaded fasteners. The adapter frame 11 has threaded holes spaced vertically. The welding torch mounting plate 13 can be installed in a suitable position as needed using screws or other threaded fasteners that mate with the corresponding threaded holes, allowing for fine-tuning of the welding torch's longitudinal position. The adapter frame 11 in this embodiment also has a lateral fine-tuning knob 14. By turning the lateral fine-tuning knob 14, the lateral position of the welding torch can be fine-tuned. Figure 7 As shown, an arc-shaped mounting groove 13a is machined on the welding torch mounting plate 13. The welding torch 10 is fixed to the welding torch mounting plate 13 by threaded fasteners passing through the mounting groove 13a. The angle of the welding torch 10 can be adjusted along the mounting groove 13a.

[0045] The second clamping fixture 8 is used to fix the straight section of the oil pipeline. For example... Figure 8 and Figure 9As shown, the second clamping fixture 8 in this embodiment includes a fixture base 8-1, a pressure rod 8-2, a bracket 8-3, and a connecting rod handle 8-4. The fixture base 8-1 is fixed to the worktable 1-1. A straight pipe placement portion 8-1a is provided at the top of the fixture base 8-1. The straight pipe placement portion 8-1a is machined with a placement groove 8-1b for placing a straight portion of the oil pipeline. The straight portion of the oil pipeline can be placed in the placement groove 8-1b. The pressure rod 8-2 is located above the placement groove 8-1b. The bracket 8-3 is located at the top of the fixture base 8-1. The connecting rod handle 8-4 is mounted on the bracket 8-3 via a pin, and the connecting rod handle 8-4 can rotate around the pin. The pressure rod 8-2 is located at one end of the connecting rod handle 8-4. The connecting rod handle 8-4 acts as a lever. When the end of the connecting rod handle 8-4 away from the pressure rod 8-2 is pressed down, the pressure rod 8-2 is lifted upwards. Conversely, when the end of the connecting rod handle 8-4 away from the pressure rod 8-2 is lifted upwards, the pressure rod 8-2 is pressed downwards, pressing it onto the straight oil pipe located in the placement groove 8-1b. This fixes the straight oil pipe, facilitating the welding of the oil pipe 101 to the connector 102 or the sealing profiled pipe 100. When the pressure rod 8-2 presses down on the straight oil pipe, it prevents the straight oil pipe from bending or falling off, thus improving welding quality, while also not affecting the rotation of the oil pipe coil during welding operations.

[0046] The third clamping fixture 9 is used to fix the connector 102. For example... Figure 11 and Figure 12 As shown, the third clamping fixture 9 in this embodiment includes a fixture body 9-1, a clamping shaft 9-2, a connector 9-3, and an adjusting handle 9-4. A cylindrical second clamping portion 9-1a protruding from the fixture body 9-1 is machined on the fixture body 9-1. The second chuck 6 clamps the second clamping portion 9-1a, thereby mounting the third clamping fixture 9 onto the second chuck 6. A connector placement groove 9-1b for placing the connector 102 is machined on the fixture body 9-1. The cross-sectional shape of the connector placement groove 9-1b corresponds to the cross-sectional shape of the connector 102, so that the connector 102 can be inserted into the connector placement groove 9-1b.

[0047] The fixture body 9-1 has an extension 9-1c that protrudes radially from the fixture body 9-1. A through groove 9-1d is machined within the extension 9-1c, extending radially to the connector placement groove 9-1b. A clamping shaft 9-2 is disposed within the through groove 9-1d and can move within it. One end of the clamping shaft 9-2 is hinged (e.g., by a pin) to a connector 9-3 also disposed within the through groove 9-1d. The other end of the connector 9-3 is hinged to an adjusting handle 9-4, and the other end of the adjusting handle 9-4 extends out of the through groove 9-1d.

[0048] The adjusting handle 9-4 and the connecting piece 9-3 form a linkage assembly, such as Figure 13 As shown, with Figure 13Taking the direction shown as an example, when the adjusting handle 9-4 is pulled upwards, the adjusting handle 9-4 drives the clamping shaft 9-2 to move within the through groove 9-1c via the connecting piece 9-3. The end of the clamping shaft 9-2 exits the connector placement groove 9-1b, and the third clamping fixture 9 is in a loosened state, thus allowing the connector 102 to be picked up and put down. Figure 14 As shown, with Figure 14 Taking the direction shown as an example, when the adjusting handle 9-4 is pulled down, the adjusting handle 9-4 drives the clamping shaft 9-2 to move in the through groove 9-1c through the connector 9-3. The end of the clamping shaft 9-2 extends into the connector placement groove 9-1b, the third clamping fixture 9 is in a clamped state, and the clamping shaft 9-2 locks the connector 102, which facilitates the welding of the connector 102 and the oil pipe 101.

[0049] The process of welding the stress sensing element using the welding device of this embodiment will be described below with reference to the accompanying drawings. Welding the stress sensing element mainly involves two parts: first, welding the connector 102 and the oil pipe 101 together; and second, welding the sealed shaped tube 100 and the oil pipe 101 together. There is no specific order for welding these parts, but considering that the connector 102 is smaller and lighter than the sealed shaped tube 100, thus having less impact on the welding process, it is advisable to weld the connector 102 and the oil pipe 101 together first, and then weld the sealed shaped tube 100 and the oil pipe 101 together.

[0050] Before welding, the first clamping fixture 7 and the third clamping fixture 9 are respectively installed on the first chuck 5 and the second chuck 6, and the angles are adjusted. The first chuck 5 and the second chuck 6 are pneumatically locked with the first clamping fixture 7 and the second clamping fixture 8.

[0051] Mount connector 102 onto fixture body 9-1 of third clamping fixture 9, insert connector 102 into connector placement slot 9-1b of fixture body 9-1, and then turn adjustment handle 9-4 to lock connector 102 with clamping shaft 9-2; place oil pipeline coil on pipe plate 7-2 and clamp oil pipeline coil with two coil clamps 7-3;

[0052] The straight oil pipe, which has been previously extracted from the oil pipe coil, is passed through the placement slot 8-1b on the fixture seat 8-1 of the second clamping fixture 8. The end of the straight oil pipe is inserted into the corresponding hole of the connector 102, and the pressure rod 8-2 is pressed down by the connecting rod handle 8-4.

[0053] Start the welding machine 3 and weld the connector 102 and the oil pipe 101. During the welding process, the first chuck 5 and the second chuck 6 rotate synchronously in opposite directions, so that the welding torch 10 can weld around the circumference. The height and horizontal position of the welding torch should be adjusted in advance during the start-up and debugging.

[0054] After welding is completed, the welding torch 10 is reset, the first chuck 5 and the second chuck 6 are also rotated back to their initial positions, the first, second and third clamping fixtures are opened, and the oil pipe 101 and connector 102 are removed.

[0055] When welding the sealing profiled tube 100 and the oil pipeline 101, install the oil pipeline following the same steps, and then mount the sealing profiled tube 100 onto the second chuck 6. Figure 10 As shown; start the electric welding machine 3 to weld the sealed special-shaped tube 100 and the oil pipeline 101. During the welding process, the first chuck 5 and the second chuck 6 rotate synchronously in opposite directions, so that the welding gun 10 can weld a circle around the circumference.

[0056] After welding is completed, the welding torch 10 is reset, and the first chuck 5 and the second chuck 6 are also rotated back to their initial positions. The first, second and third clamping fixtures are opened, and the oil pipe 101 and the sealing shaped pipe 100 are removed.

[0057] This invention provides a specific clamping fixture for oil pipelines, connectors, and sealing irregular-shaped pipes. Compared to existing welding processes that use simple fixation methods such as vises and clamps, the clamping is more secure, preventing parts from falling or misaligning during welding, thus improving welding quality and yield. Furthermore, the use of automated welding improves efficiency. The adjustable welding torch position allows for precise control of the distance and angle between the torch and the workpiece, preventing weld blockage and burn-through.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A welding apparatus for a stress sensing element, characterized in that: The stress sensing element includes a sealed shaped tube, a connector, and an oil supply pipe connecting the sealed shaped tube and the connector; The welding device includes: a work cabinet, an electric welding machine, and a fume purifier. The work cabinet and the fume purifier are connected by an exhaust pipe. The work cabinet is equipped with a workbench and a welding torch slide rail that extends horizontally along the length of the workbench and is located above the workbench. The worktable is provided with a first chuck and a second chuck arranged opposite to each other. The first chuck and the second chuck can rotate around their own axis. The first chuck is detachably provided with a first clamping fixture for fixing the oil pipeline coil. The second chuck is detachably provided with a third clamping fixture for fixing the connector or the sealing shaped tube. A second clamping fixture for fixing the straight pipe of the oil pipeline is provided between the first chuck and the second chuck; The welding torch slide rail is provided with a welding torch assembly that can move along the welding torch slide rail. The welding torch assembly includes a welding torch whose position can be adjusted up and down and whose angle can be adjusted. The first clamping fixture includes a fixed frame, a pipe-laying plate disposed on the fixed frame, and two coil clamps centrally symmetrically disposed on the pipe-laying plate. The fixed frame is provided with a cylindrical first clamping part held by the first chuck. The coil clamps include a pressure plate pressing on the outer ring of the oil pipe coil, a base disposed on the pipe-laying plate, a handle connected to the base via a pin, and a linkage rod with one end hinged to the handle and the other end hinged to a connecting rod. The oil pipe coil is located between the pressure plates. The base is provided with a limiting part for restricting the connecting rod to move horizontally only along its own axis. The connecting rod passes through the limiting part and both ends protrude outside the limiting part. The end of the connecting rod away from the handle is connected to the pressure plate. The handle is located inside the pipe-laying plate relative to the pressure plate.

2. The welding apparatus as described in claim 1, characterized in that: The first chuck and the second chuck are pneumatic rotary chucks.

3. The welding apparatus as described in claim 1, characterized in that: The handle is a T-shaped or L-shaped handle.

4. The welding apparatus as described in claim 1, characterized in that: The limiting part is a hollow cylindrical shape.

5. The welding apparatus as described in claim 1, characterized in that: The outer circumferential surface of the end of the connecting rod connected to the pressure plate is machined with external threads, and the pressure plate is provided with threaded holes. The pressure plate and the connecting rod are connected by threads and locked by a lock nut.

6. The welding apparatus as described in claim 1, characterized in that: The second clamping fixture includes a clamping seat on the worktable, a bracket on the top of the clamping seat, a connecting rod handle mounted on the bracket via a pin, and a pressure rod at one end of the connecting rod handle; the top of the clamping seat is provided with a straight tube placement part, the straight tube placement part is provided with a placement groove, and the pressure rod is located above the placement groove.

7. The welding apparatus as described in claim 1, characterized in that: The third clamping fixture includes a clamping body, a clamping shaft, an interceptor, and an adjusting handle. The clamping body is provided with a connector placement groove, a cylindrical second clamping part held by the second chuck, and an extension protruding from the clamping body. The extension is provided with a through groove that extends to the connector placement groove. The clamping shaft and the connector are disposed in the through groove. One end of the connector is hinged to the clamping shaft, and the other end is hinged to the adjusting handle. The other end of the adjusting handle extends out of the through groove. The clamping shaft can extend into the connector placement groove.

8. The welding apparatus as described in claim 1, characterized in that: The welding torch assembly also includes a lifting cylinder mounted on the welding torch slide rail, a transfer frame connected to the piston rod of the lifting cylinder, and a welding torch mounting plate mounted on the transfer frame. The welding torch is mounted on the welding torch mounting plate, and the mounting height of the welding torch mounting plate on the transfer frame is adjustable. The welding torch mounting plate is provided with an arc-shaped mounting groove, and the angle of the welding torch can be adjusted along the mounting groove.

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