Welding device for stress sensing element

Abstract

A welding device of a stress sensing element comprises a working cabinet, an electric welding machine and a smoke purifier, and the working cabinet is communicated with the smoke purifier through an exhaust pipe; a working table and a welding gun sliding rail which is arranged above the working table and horizontally extends in the length direction of the working table are arranged in the working cabinet; a first chuck and a second chuck which are oppositely arranged are arranged on the workbench, the first chuck and the second chuck can axially rotate around the first chuck and the second chuck, the first chuck is detachably provided with a first clamp tool used for fixing a coil pipe of an oil conveying pipe, and the second chuck is detachably provided with a third clamp tool or a sealing special-shaped pipe used for fixing a connector; a second clamping tool used for fixing the oil conveying pipe straight pipe is arranged between the first chuck and the second chuck. A welding gun assembly capable of moving along the welding gun sliding rail is arranged on the welding gun sliding rail and comprises a welding gun with the position capable of being adjusted up and down and the angle capable of being adjusted. Automatic welding of the high-pressure-resistant stress sensor can be achieved, the welding effect is good, and the production efficiency is high.

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] The application discloses a welding device for a stress sensing element, which comprises a sealed special-shaped tube, a connecting head and an oil conveying pipe connecting the sealed special-shaped tube and the connecting head; the welding device comprises a workbench, an electric welder and a smoke purifier, and the workbench and the smoke purifier are communicated through an exhaust pipe; a worktable is arranged in the workbench, and a welding gun sliding rail extending horizontally along the length direction of the worktable is arranged above the worktable; a first chuck and a second chuck are oppositely arranged on the worktable, the first chuck and the second chuck can rotate around their own axes, a first clamping tool for fixing a coil pipe of the oil conveying pipe is detachably arranged on the first chuck, and a third clamping tool for fixing the connecting head or the sealed special-shaped tube is detachably arranged on the second chuck; a second clamping tool for fixing a straight pipe of the oil conveying pipe is arranged between the first chuck and the second chuck; a welding gun assembly which can move along the welding gun sliding rail is arranged on the welding gun sliding rail, and the welding gun assembly comprises a welding gun which can be adjusted in position up and down and in angle.

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

[0008] In some embodiments, the first clamping tool comprises a fixing frame, a pipe placing plate arranged on the fixing frame and two coil pipe clamps which are symmetrically arranged on the pipe placing plate; a first clamping part which is clamped by the first chuck is arranged on the fixing frame in a columnar shape, and the coil pipe clamps comprise pressing plates which press the outer circles of the coil pipes of the oil conveying pipe, and the coil pipes of the oil conveying pipe are located between the pressing plates.

[0009] In some embodiments, the coil pipe clamps comprise a base arranged on the pipe placing plate, a handle connected with the base through a pin shaft, a linkage rod which is hinged at one end with the handle and at the other end with a connecting rod, and a limiting part arranged on the base for limiting the connecting rod to move horizontally along its own axis direction; the connecting rod passes through the limiting part and exposes two ends outside the limiting part, one end of the connecting rod which is far away from the handle is connected with the pressing plate, and the handle is located on the inner side of the pipe placing plate relative to the pressing 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 cylinder.

[0012] In some embodiments, an outer periphery of one end of the connecting rod which is connected with the pressing plate is provided with external threads, a threaded hole is arranged on the pressing plate, the pressing plate and the connecting rod are connected through threads, and the connection between the pressing plate and the connecting rod is locked through a locking nut.

[0013] In some embodiments, the second clamping tool comprises a clamp base arranged on the workbench, a support arranged on the top of the clamp base, a connecting rod handle arranged on the support through a pin shaft, and a pressing rod arranged on one end of the connecting rod handle; the top of the clamp base is provided with a straight pipe placing part, the straight pipe placing part is provided with a placing groove, and the pressing rod is located above the placing groove.

[0014] In some embodiments, the third clamping tool comprises a clamp body, a pressing shaft, an intercepting piece, and an adjusting handle; the clamp body is provided with a connector placing groove, a second clamping part in the shape of a column clamped by the second chuck, and an extension part protruding from the clamp body, a through groove penetrating into the connector placing groove is arranged in the extension part, the pressing shaft and the connector are arranged in the through groove, one end of the connector is hinged with the pressing shaft, the other end is hinged with the adjusting handle, the other end of the adjusting handle extends out of the through groove, and the pressing shaft can extend into the connector placing groove.

[0015] In some embodiments, the welding gun assembly further comprises a lifting cylinder arranged on the welding gun sliding rail, an adapter frame connected with the piston rod of the lifting cylinder, and a welding gun mounting plate arranged on the adapter frame; the welding gun is arranged on the welding gun mounting plate, and the mounting height of the welding gun mounting plate on the adapter frame is adjustable; the welding gun mounting plate is provided with an arc-shaped mounting groove, and the welding gun can be adjusted in angle along the mounting groove.

[0016] According to the technical scheme, the corresponding clamping tool is arranged for the structure of the high-pressure stress sensing element applied to the coal seam extrusion pressure detection, the welded part can be quickly and effectively fixed, the welded part can be stably clamped during the welding process, and the welded part will not fall off or loosen, the welding effect is effectively improved, the defective product rate is reduced, the chuck drives the clamping tool to rotate during the welding process, the welding gun can stably and effectively complete the welding of the welded part, the problems of welding through and welding blockage of the welded part caused by the thin wall and special shape of the welded part are solved, and the technical requirements of high pressure resistance and high sensitivity of the stress sensing element are met. The stress sensor applied to the coal seam extrusion pressure detection in the coal mine can be automatically welded, the complicated manual welding is abandoned, the production cost is saved, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application, the drawings required in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1A schematic view of a high-pressure-resistant stress sensing element structure;

[0019] Figure 2 A schematic view of a welding device structure of an embodiment of the present application;

[0020] Figure 3 A schematic view of an internal component of a workbench of an embodiment of the present application;

[0021] Figure 4 A schematic view of a first clamping tool structure of an embodiment of the present application;

[0022] Figure 5 A schematic view of another angle of a first clamping tool structure of an embodiment of the present application;

[0023] Figure 6 A schematic view of a coil clamp of an oil pipeline in a loosened state of an embodiment of the present application;

[0024] Figure 7 A schematic view of a welding gun assembly structure of an embodiment of the present application;

[0025] Figure 8 A schematic view of a second clamping tool structure of an embodiment of the present application;

[0026] Figure 9 A schematic view of another angle of a second clamping tool structure of an embodiment of the present application;

[0027] Figure 10 A schematic view of a welding device welding an oil pipeline and a sealing special-shaped pipe of an embodiment of the present application;

[0028] Figure 11 A schematic view of a third clamping tool structure of an embodiment of the present application;

[0029] Figure 12 A sectional view of a third clamping tool structure of an embodiment of the present application;

[0030] Figure 13 A schematic view of a third clamping tool in a loosened state of an embodiment of the present application;

[0031] Figure 14 A schematic view of a third clamping tool in a clamped state of an embodiment of the present application.

[0032] The specific embodiments of the present application are further described in detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[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 the embodiment comprises a first chuck 5, a second chuck 6, a first clamping tool 7, a second clamping tool 8 and a third clamping tool 9. The first chuck 5 and the second chuck 6 are arranged on the workbench 1-1 in a spaced manner, and the first chuck 5 and the second chuck 6 are arranged oppositely. The first chuck 5 is used for mounting the first clamping tool 7, and the second chuck 6 is used for mounting the third clamping tool 9 or the sealing special-shaped pipe 100. The first chuck 5 and the second chuck 6 of the embodiment are both pneumatic rotary chucks, which clamp the clamping tool or the sealing special-shaped pipe by a pneumatic manner. The first chuck 5 and the second chuck 6 can rotate around their own axes. The first chuck 5 and the second chuck 6 rotate synchronously during welding.

[0038] The oil pipeline 102 is relatively long, and is usually coiled to form a coil for storage. However, in order to facilitate welding, the two ends of the oil pipeline are pulled out to form straight pipes.

[0039] The first clamping tool 7 is used for fixing the coil of the oil pipeline. The first clamping tool 7 is arranged on the first chuck 5, is fixed by the first chuck 5 and is driven to rotate by the first chuck 5. As shown in Figure 4 and Figure 5 The first clamping tool 7 of the embodiment comprises a fixing frame 7-1, a pipe placing plate 7-2 and a coil clamp 7-3. The fixing frame 7-1 has a cylindrical first clamping portion 7-1a. The first chuck 5 clamps the first clamping portion 7-1a, so that the first clamping tool 7 is mounted on the first chuck 5. The pipe placing plate 7-2 is arranged on the fixing frame 7-1 and is used for placing the coil of the oil pipeline. The pipe placing plate 7-2 is provided with a pair of center-symmetrically arranged coil clamps 7-3. The coil clamps 7-3 are used for fixing the coil of the oil pipeline placed on the pipe placing plate 7-3, so that the coil of the oil pipeline does not move when the first clamping tool 7 rotates with the first chuck 5.

[0040] The coil clamp 7-3 of the embodiment comprises a pressing 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 on the pipe placing plate 7-2. The handle 7-34 is a T-shaped or L-shaped handle. The handle 7-34 is connected with the base 7-35 through a pin and can rotate around the pin. One end of the linkage rod 7-33 is hinged with the handle 7-34 and the other end is hinged with the connecting rod 7-32. The base 7-35 is provided with a limiting part 7-35a for limiting the connecting rod 7-32 so that it can only move horizontally along its own axis. The limiting part 7-35a is oppositely arranged with the handle 7-34. The limiting part 7-35a of the embodiment is a hollow cylindrical shape. The connecting rod 7-32 can pass through the limiting part 7-35a and the two ends are exposed outside the limiting part 7-35a. In other embodiments, the limiting part 7-35a can also be a sliding groove. The other end of the connecting rod 7-32 is connected with the pressing plate 7-31. The pressing plate 7-31 is outside the handle 7-34 so that it can be pressed on the outer periphery of the oil pipeline coil. The handle 7-34 is located on the inner side of the pipe placing plate 7-2 relative to the pressing plate 7-31 and is closer to the center of the pipe placing plate 7-2. Both the base 7-35 and the handle 7-34 are inside the oil pipeline coil and do not affect the placement of the oil pipeline coil.

[0041] The outer periphery of one end of the connecting rod 7-32 is provided with external threads. The pressing plate 7-31 is provided with a threaded hole. The pressing plate 7-31 and the connecting rod 7-32 are connected through threads and locked by a locking nut 7-35. The external threads on the connecting rod 7-32 also have the function of adjusting the installation position of the pressing plate 7-31 on the connecting rod 7-32, which can adapt to oil pipeline coils with different outer diameters. The threaded hole on the pressing plate 7-31 can also be arranged in the vertical direction to adjust the installation height of the pressing plate 7-31, so that it can adapt to oil pipeline coils with different heights. The more the number of turns of the oil pipeline coil, the higher the height. The installation height of the pressing plate can be adjusted by the cooperation of different threaded holes on the connecting rod and the pressing plate, improving the versatility.

[0042] Referring to Figure 5 and Figure 6 When the handle 7-34 rotates around the pin between it and the base 7-35, it can drive the linkage rod 7-33 connected with it to move, which further drives the connecting rod 7-32 connected with it to move. The connecting rod 7-32 can only move horizontally due to the limitation of the limiting part 7-35a. The connecting rod 7-32 moves horizontally, driving the pressing plate 7-31 to move horizontally. The two sets of pressing plates 7-31 of the oppositely arranged coil clamps 7-3 can move together towards or away from each other under the control of the handle 7-34, clamping or loosening the oil pipeline coil between the pressing plates 7-31. Figure 3 Figure 6 ​As shown, when the handle 7-34 rotates around the pin shaft between it and the base 7-35 to the direction away from the limiting part 7-35a, the linkage rod 7-33 connected with it is driven 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 pressing plate 7-31 connected with the connecting rod 7-32 presses the outer periphery of the oil pipeline coil, thereby playing a fixing role on the oil pipeline coil.

[0043] As shown in Figure 2 and Figure 7 The welding gun assembly of the embodiment includes a welding gun 10, an adapter frame 11, a lifting cylinder 12 and a welding gun mounting plate 13. The lifting cylinder 12 is arranged on the welding gun slide rail 1-2 and can slide along the welding gun slide rail 1-2, so as to adjust the transverse position (horizontal position) of the welding gun 10 in a larger range. The piston rod of the lifting cylinder 12 is connected with the adapter frame 11, and when the lifting cylinder 12 acts, it can drive the adapter frame 11 to move up and down, so as to adjust the longitudinal position (height position) of the welding gun 10. The welding gun 10 is arranged on the welding gun mounting plate 13, and the welding gun mounting plate 13 is arranged on the adapter frame 11.

[0044] The welding gun mounting plate 13 and the adapter frame 11 of the embodiment are connected through threaded fasteners, and the adapter frame 11 is provided with threaded holes arranged in the vertical direction at intervals. The welding gun mounting plate 13 can be installed at a suitable position according to the needs through threaded fasteners such as screws matched with the corresponding threaded holes, so as to realize the fine adjustment of the longitudinal position of the welding gun. The adapter frame 11 of the embodiment is also provided with a transverse fine adjustment knob 14, and the fine adjustment of the transverse position of the welding gun can be realized by screwing the transverse fine adjustment knob 14. As shown in Figure 7 An arc-shaped mounting groove 13a is machined on the welding gun mounting plate 13, and the welding gun 10 is fixed with the welding gun mounting plate 13 through threaded fasteners passing through the mounting groove 13a, and the angle of the welding gun 10 can be adjusted along the mounting groove 13a.

[0045] The second clamp tool 8 is used to realize the fixation of the straight pipe of the oil pipeline. As shown in Figure 8 and Figure 9As shown, the second clamping tool 8 of the embodiment comprises a clamping base 8-1, a pressing rod 8-2, a bracket 8-3 and a connecting rod handle 8-4. The clamping base 8-1 is fixed on the workbench 1-1, and a straight pipe placing portion 8-1a is arranged on the top of the clamping base 8-1. The straight pipe placing portion 8-1a is processed with a placing groove 8-1b for placing the straight pipe of the oil delivery pipe, and a part of the straight pipe of the oil delivery pipe can be placed in the placing groove 8-1b. The pressing rod 8-2 is arranged above the placing groove 8-1b. The bracket 8-3 is arranged on the top of the clamping base 8-1, and the connecting rod handle 8-4 is arranged on the bracket 8-3 through a pin shaft and can rotate around the pin shaft. The pressing rod 8-2 is arranged at one end of the connecting rod handle 8-4. The connecting rod handle 8-4 is equivalent to a lever. When the end of the connecting rod handle 8-4 far away from the pressing rod 8-2 is pressed down, the pressing rod 8-2 can be lifted up. Conversely, when the end of the connecting rod handle 8-4 far away from the pressing rod 8-2 is lifted up, the pressing rod 8-2 can be pressed down and pressed on the straight pipe of the oil delivery pipe in the placing groove 8-1b, thereby fixing the straight pipe of the oil delivery pipe and facilitating the welding of the oil delivery pipe 101 and the connecting head 102 or the sealing special-shaped pipe 100. When the pressing rod 8-2 presses the straight pipe of the oil delivery pipe, the straight pipe of the oil delivery pipe can be prevented from bending or falling, thereby improving the welding quality and not affecting the rotation of the coil pipe of the oil delivery pipe during the welding operation.

[0046] The third clamping tool 9 is used for fixing the connecting head 102. As shown in Figure 11 and Figure 12 As shown, the third clamping tool 9 of the embodiment comprises a clamping body 9-1, a pressing shaft 9-2, a connecting piece 9-3 and an adjusting handle 9-4. The clamping body 9-1 is processed with a second clamping portion 9-1a protruding from the columnar clamping body 9-1. The second chuck 6 clamps the second clamping portion 9-1a, so that the third clamping tool 9 is installed on the second chuck 6. The clamping body 9-1 is processed with a connecting head placing groove 9-1b for placing the connecting head 102. The cross-sectional shape of the connecting head placing groove 9-1b corresponds to the cross-sectional shape of the connecting head 102, so that the connecting head 102 can be inserted into the connecting head placing groove 9-1b.

[0047] The clamping body 9-1 is provided with an extension portion 9-1c protruding from the clamping body 9-1 in the radial direction. The extension portion 9-1c is processed with a through groove 9-1d penetrating to the connecting head placing groove 9-1b in the radial direction. The pressing shaft 9-2 is arranged in the through groove 9-1d and can move in the through groove 9-1d. One end of the pressing shaft 9-2 is hinged (such as connected through a pin) with the connecting piece 9-3 also arranged in the through groove 9-1d. The other end of the connecting piece 9-3 is hinged with the 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 constitute a linkage rod assembly. As shown in Figure 13 , the adjusting handle 9-4 is used for adjusting the position of the connecting head 102 in the connecting head placing groove 9-1b, so that the connecting head 102 can be placed in the connecting head placing groove 9-1b in a proper position. Figure 13As shown, when the adjusting handle 9-4 is pulled upward, the adjusting handle 9-4 drives the pressing shaft 9-2 to move in the through slot 9-1c through the connecting piece 9-3, the end of the pressing shaft 9-2 exits the connecting head placing slot 9-1b, and the third clamping tool 9 is in a loosened state, so that the connecting head 102 can be taken out or placed. Figure 14 As shown, when the adjusting handle 9-4 is pulled upward, the adjusting handle 9-4 drives the pressing shaft 9-2 to move in the through slot 9-1c through the connecting piece 9-3, the end of the pressing shaft 9-2 exits the connecting head placing slot 9-1b, and the third clamping tool 9 is in a loosened state, so that the connecting head 102 can be taken out or placed. Figure 14 As shown, when the adjusting handle 9-4 is pulled downward, the adjusting handle 9-4 drives the pressing shaft 9-2 to move in the through slot 9-1c through the connecting piece 9-3, the end of the pressing shaft 9-2 extends into the connecting head placing slot 9-1b, the third clamping tool 9 is in a clamped state, the pressing shaft 9-2 locks the connecting head 102, and the welding of the connecting head 102 and the oil delivery pipe 101 is facilitated.

[0049] The process of welding the stress sensing element using the welding device of the embodiment will be described below in combination with the drawings. When welding the stress sensing element, it mainly includes two parts, one is to weld the connecting head 102 and the oil delivery pipe 101 together, and the other is to weld the sealing special-shaped pipe 100 and the oil delivery pipe 101 together. There is no specific order for which part to be welded first, but considering that the connecting head 102 is relatively small in size and light in weight compared with the sealing special-shaped pipe 100, and has little influence on the welding process, the connecting head 102 and the oil delivery pipe 101 can be welded together first, and then the sealing special-shaped pipe 100 and the oil delivery pipe 101 are welded.

[0050] Before welding, the first clamping tool 7 and the third clamping tool 9 are respectively installed on the first chuck 5 and the second chuck 6, and the angles are adjusted, and the first chuck 5 and the second chuck 6 lock the first clamping tool 7 and the second clamping tool 8 through a pneumatic mode;

[0051] The connecting head 102 is installed on the clamping body 9-1 of the third clamping tool 9, the connecting head 102 is inserted into the connecting head placing slot 9-1b of the clamping body 9-1, and then the adjusting handle 9-4 is pulled to lock the connecting head 102 by the pressing shaft 9-2; the oil delivery pipe coil is placed on the pipe placing plate 7-2, and the oil delivery pipe coil is clamped through the two coil clamps 7-3;

[0052] The straight oil delivery pipe previously drawn out of the oil delivery pipe coil is inserted into the corresponding hole of the connecting head 102 through the placing slot 8-1b on the clamping seat 8-1 of the second clamping tool 8, and the end of the straight oil delivery pipe is inserted into the corresponding hole of the connecting head 102, and the straight oil delivery pipe is pressed by the pressing rod 8-2 through the connecting rod handle 8-4;

[0053] The electric welding machine 3 is started, and the connecting head 102 and the oil delivery pipe 101 are welded, and during the welding process, the first chuck 5 and the second chuck 6 are synchronously and reversely rotated, so that the welding gun 10 can weld a circle along the circumference; the height and the horizontal position of the welding gun are adjusted in advance during the start-up debugging;

[0054] After welding, the welding gun 10 is reset, the first chuck 5 and the second chuck 6 are also turned back to the initial position, the first, second and third clamping tools are opened, and the oil delivery pipe 101 and the connecting head 102 are taken off;

[0055] When welding the sealing special-shaped pipe 100 and the oil delivery pipe 101, the oil delivery pipe is assembled according to the same steps, the sealing special-shaped pipe 100 is assembled on the second chuck 6, as shown in the figure; the electric welding machine 3 is started, the sealing special-shaped pipe 100 and the oil delivery pipe 101 are welded, and the first chuck 5 and the second chuck 6 are synchronously and reversely rotated during the welding process, so that the welding gun 10 can be circumferentially welded for one circle; Figure 10

[0056] After welding, the welding gun 10 is reset, the first chuck 5 and the second chuck 6 are also turned back to the initial position, the first, second and third clamping tools are opened, and the oil delivery pipe 101 and the connecting head 102 are taken off.

[0057] The present application designs specific clamping tools for the oil delivery pipe, the connecting head and the sealing special-shaped pipe, compared with the existing welding process using simple fixtures such as vices and clips, the clamping is more reliable, which can prevent the parts from falling off and mispositioning during welding, is conducive to improving the welding quality and improving the yield. Moreover, the machine is automatically welded, the efficiency is improved. The welding gun position is adjustable, the distance and angle between the welding gun and the welded part can be accurately controlled, and the welding blockage and welding penetration can be avoided.

[0058] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.​

Claims

1. A welding apparatus for a stress sensing element, characterized by: The stress sensing element comprises a sealed special-shaped pipe, a connecting head, and an oil delivery pipe connecting the sealed special-shaped pipe and the connecting head; The welding device comprises a workbench, a welding machine, and a smoke purifier, the workbench and the smoke purifier are communicated through an exhaust pipe; a worktable is arranged in the workbench, and a welding gun sliding rail extending horizontally along the length direction of the worktable is arranged above the worktable; A first chuck and a second chuck are arranged oppositely on the worktable, the first chuck and the second chuck can rotate around their own axes, a first clamp tool for fixing the coil pipe of the oil delivery pipe is detachably arranged on the first chuck, and a third clamp tool for fixing the connecting head or the sealed special-shaped pipe is detachably arranged on the second chuck; A second clamp tool for fixing the straight pipe of the oil delivery pipe is arranged between the first chuck and the second chuck; A welding gun assembly is arranged on the welding gun sliding rail and can move along the welding gun sliding rail, the welding gun assembly comprises a welding gun which can be adjusted in position up and down and can be adjusted in angle.

2. The welding device of claim 1, wherein: The first chuck and the second chuck are pneumatic rotary chucks.

3. The welding device of claim 1, wherein: The first clamp tool comprises a fixing frame, a pipe placing plate arranged on the fixing frame, and two coil pipe clamps arranged symmetrically on the pipe placing plate; a first clamping part clamped by the first chuck is arranged on the fixing frame in a columnar shape, the coil pipe clamps comprise pressing plates pressing the outer circles of the coil pipes of the oil delivery pipe, and the coil pipes of the oil delivery pipe are located between the pressing plates.

4. The welding device of claim 3, wherein: The coil pipe clamp comprises a base arranged on the pipe placing plate, a handle connected with the base through a pin shaft, a linkage rod hinged at one end to the handle and hinged at the other end to a connecting rod, a limiting part for limiting the connecting rod to move horizontally along its own axis is arranged on the base, the connecting rod passes through the limiting part and exposes two ends outside the limiting part, one end of the connecting rod away from the handle is connected with the pressing plate, and the handle is located on the inner side of the pipe placing plate relative to the pressing plate.

5. The welding device of claim 3, wherein: The handle is a T-shaped or L-shaped handle.

6. The welding apparatus of claim 3, wherein: The limiting part is a hollow cylinder.

7. The welding apparatus of claim 3, wherein: An outer thread is formed on the outer circumferential surface of one end of the connecting rod connected with the pressing plate, a threaded hole is arranged on the pressing plate, the pressing plate and the connecting rod are connected through the threads, and are locked through a locking nut.

8. The welding device of claim 1, wherein: The second clamp tool comprises a clamp seat arranged on the worktable, a support arranged on the top of the clamp seat, a connecting rod handle arranged on the support through a pin shaft, and a pressing rod arranged on one end of the connecting rod handle; a straight pipe placing part is arranged on the top of the clamp seat, the straight pipe placing part is provided with a placing groove, and the pressing rod is located above the placing groove.

9. The welding device of claim 1, wherein: The third clamp tool includes a clamp body, a pressing shaft, an intercepting piece and an adjusting handle; the clamp body is provided with a connecting head placing groove, a second clamping part clamped by the second chuck, and an extension part protruding from the clamp body, a through groove is arranged in the extension part and extends to the connecting head placing groove, the pressing shaft and the connecting piece are arranged in the through groove, one end of the connecting head is hinged to the pressing shaft, the other end is hinged to the adjusting handle, the other end of the adjusting handle extends out of the through groove, and the pressing shaft can extend into the connecting head placing groove.

10. The welding device of claim 1, wherein: The welding gun assembly further includes a lifting cylinder arranged on the welding gun sliding rail, an adapter frame connected to a piston rod of the lifting cylinder, and a welding gun mounting plate arranged on the adapter frame, the welding gun is arranged on the welding gun mounting plate, and the mounting height of the welding gun mounting plate on the adapter frame is adjustable; an arc-shaped mounting groove is arranged on the welding gun mounting plate, and the welding gun can be adjusted in angle along the mounting groove.

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