A device for circumferential welding of upper and lower covers of a compressor

Abstract

The utility model relates to technical field of compressor production, specifically relates to a device for welding of compressor upper and lower cover circumference, it includes frame, deflection device, clamping device, welding torch, welding torch moving device, welding torch cleaning device, clamping device is located on deflection device, welding torch sets up on welding torch moving device deflection device, welding torch cleaning device, welding torch moving device all set up on the frame, the utility model passes through using the single welding torch of immovable position, utilizes the mode of workpiece rotation and carries out welding, can weld the high -quality weld. And the workpiece is placed in the inclination, in the welding process, the welding fluid will flow along the junction of upper and lower cover circumference and fill it due to the action of gravity and the action of liquid surface tension, will make the weld internal density uniform after welding, and the weld is not easy to collapse due to uneven stress. Through setting up the welding torch cleaning mechanism, the welding torch is cleaned and lubricated after working for a period of time can prolong the service life of the welding torch and improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of compressor manufacturing, and specifically to a device for circumferential welding of the upper and lower covers of a compressor. Background Technology

[0002] Currently, the circumferential welding devices for the upper and lower covers of compressors on compressor production lines fix the workpiece vertically and use a pair of oppositely positioned welding torches to rotate 190 degrees around the welding plane for welding. In this welding method, the welding liquid is easily affected by gravity and flows down the outer surface of the compressor from the circumference of the upper and lower covers. During welding, the downward flow of the welding liquid will cause uneven density distribution of the upper and lower layers of the weld, which will reduce the quality of the weld and make it easy to crack and leak air during use due to uneven stress.

[0003] In actual production, due to the use of a pair of welding torches set opposite each other, two welding intersection points will be generated on the workpiece. The welding torch will experience a slight positional shift during continuous operation. Because of this positional shift, the weld seam will not intersect or will not intersect completely after the welding torch rotates half a revolution. This situation will also cause air leakage at the circumference of the upper and lower covers of the compressor during daily use, which will lead to a decrease in the compressor's working efficiency and a significant safety risk. Utility Model Content

[0004] The purpose of this invention is to provide a device for welding the upper and lower covers of a compressor using a single welding torch, which has a relatively simple structure and a long service life.

[0005] And this is how the above objectives were achieved.

[0006] An apparatus for circumferential welding of the upper and lower covers of a compressor includes a frame, a deflection device, a clamping device, a welding torch, a welding torch moving device, and a welding torch cleaning device. The clamping device is mounted on the deflection device and is used to fix the workpiece.

[0007] The deflection device, mounted on the frame, is used to deflect the clamping device from the vertical direction to the horizontal direction at an angle between 30 and 60 degrees.

[0008] The welding torch moving device, mounted on the frame, is used to drive the welding torch to reciprocate in three-axis directions.

[0009] A welding torch, mounted on a welding torch moving device and kept vertical, is used for welding workpieces.

[0010] The welding torch cleaning device, located on the frame, is used for the maintenance and cleaning of the welding torch.

[0011] The objective of this utility model can also be optimized by the following technical measures.

[0012] Preferably, the clamping device includes a gripper, a gripper mounting base, a rotating device, and a fixed frame. The gripper is fixedly mounted on the gripper mounting base, and the gripper mounting base is fixedly mounted on the fixed frame. The bottom of the gripper mounting base is provided with a rotating device, which includes a servo motor and a hollow reducer. The servo motor and the hollow reducer are connected in a transmission connection to drive the gripper to rotate.

[0013] Furthermore, a gripper base block and a segment take-up piece are provided on one end of the gripper. The gripper base block and the segment take-up piece are respectively arranged on both sides of one end of the gripper. The gripping surface of the gripper base block forms a contour with the workpiece surface. The segment take-up piece can be installed on the same side as the gripper base block. The size of the workpiece that the gripper can hold can be changed by changing the combination of the segment take-up piece and the gripper base block.

[0014] Furthermore, the deflection device includes a mounting base, a connecting part, a servo motor and a reducer. The servo motor and the reducer are connected in a driving manner. The connecting part is fixedly mounted on the mounting base. The bottom of the fixed frame is provided with a rotating shaft. The rotating shaft is connected in a driving manner to the connecting part. The servo motor and the reducer pass through the connecting part and are connected in a driving manner to the rotating shaft, so as to drive the fixed frame to deflect around the rotating shaft as the axis.

[0015] Preferably, the welding torch cleaning device includes a fixed plate, a wire-cutting mechanism, a torch cleaning mechanism, and a torch cleaning retraction and telescopic mechanism. The wire-cutting mechanism and the torch cleaning mechanism are both mounted on the fixed plate. The torch cleaning retraction and telescopic mechanism includes a rotating cylinder and a rotating part, both of which are fixedly mounted on the frame. The fixed plate is connected to the rotating cylinder and the rotating part respectively, so that the fixed plate, the rotating part, and the rotating cylinder are connected in a triangular shape, allowing the fixed plate to rotate around the rotating part as the axis. When the welding torch needs to be cleaned, the rotating cylinder extends to push out the welding torch cleaning device. When the welding torch does not need to be cleaned, the rotating cylinder retracts to retract the welding torch cleaning device.

[0016] Furthermore, the fixed plate is provided with a welding torch clamp for holding the welding torch. The fixed plate is provided with a positioning hole, through which the welding torch clamp is fixedly mounted on the fixed plate. Below the welding torch clamp is a torch cleaning mechanism, which includes a pneumatic motor and a reamer. The pneumatic motor is connected to the reamer for transmission. The reamer is provided with an oil spraying mechanism. When cleaning the welding torch, the welding torch is inserted into the welding torch clamp and then placed vertically downward into the reamer. The pneumatic motor drives the reamer to clean the welding torch.

[0017] Preferably, the welding torch moving device includes a first moving mechanism, a second moving mechanism, a third moving mechanism, and a mounting panel. The first moving mechanism is equipped with a servo motor and the mounting panel. The second and third moving mechanisms are mounted on the mounting panel. The positions and reciprocating directions of the first, second, and third moving mechanisms correspond to the Y, X, and Z axes.

[0018] Furthermore, the mounting panel is provided with a through slot, and slide rails are provided on both sides of the slot. A third moving mechanism is provided on the slide rails, and a cantilever is provided on the third moving mechanism. The cantilever extends through the slot into the device, and a welding torch is provided at the end of the cantilever. The third moving mechanism is connected to the second moving mechanism. The second moving mechanism drives the third moving mechanism to move horizontally back and forth on the slide rail. The third moving mechanism controls the extension of the cantilever, thereby controlling the position of the welding torch on the Z-axis.

[0019] Preferably, the cantilever is provided with a second cantilever, and the second cantilever is provided with a fixing device. The fixing device is arranged perpendicularly to the second cantilever. The second cantilever is deflected from the vertical direction to the horizontal direction, and the deflection angle of the second cantilever is complementary to the deflection angle of the deflection device.

[0020] By adopting the above technical solution, this utility model uses a single welding torch with a fixed position and welds by rotating the workpiece. There is only one welding junction point, which reduces the variables at the junction point compared to production with dual welding torches. High-quality welds can be produced even without extremely high precision requirements. Furthermore, by placing the workpiece at an angle, the welding liquid flows along the joint between the upper and lower covers due to gravity and surface tension, filling the area and resulting in a uniform internal density of the weld, making it less prone to breakage due to uneven stress. By incorporating a welding torch cleaning mechanism, cleaning and lubricating the torch after a period of operation can significantly extend its lifespan and improve production efficiency. Attached Figure Description

[0021] Figure 1 This is an isometric view of the present invention.

[0022] Figure 2 This is a schematic diagram of the present invention.

[0023] Figure 3 This is a schematic diagram of another direction of the present invention.

[0024] Figure 4 This is a schematic diagram of the combination of the deflection device, clamping device, and welding torch moving device of this utility model.

[0025] Figure 5 This is a schematic diagram of the combination of a welding torch cleaning device and a welding torch moving device.

[0026] Figure 6 This is a schematic diagram of the combination of the clamping device and the deflection device.

[0027] Figure 7 This is a schematic diagram of the combination of the clamping device and the deflection device from another direction.

[0028] Figure 8This is a schematic diagram showing how the deflection device drives the clamping device to deflect.

[0029] In the diagram: frame (1), deflection device (2), mounting base (21), connecting part (211), clamping device (3), gripper (31), gripper base block (311), segment picker (312), gripper mounting seat (32), fixing frame (33), rotating shaft (331), slide plate (332), rotating device (34), hollow reducer (341), welding torch moving device (4), first moving mechanism (41), first guide rail (411), second moving mechanism (42), second guide rail (421) ), third moving mechanism (43), cantilever (431), second cantilever (432), fixing device (433), clamping block (434), cantilever panel (435), mounting panel (44), through groove (441), slide rail (442), welding torch cleaning device (5), fixing plate (51), positioning hole (511), rotating part (52), rotating cylinder (53), welding torch gripper (54), pneumatic motor (55), reamer (56), wire cutting mechanism (57), welding torch (6), servo motor (7). Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Combination Figures 1 to 8 A device for circumferential welding of the upper and lower covers of a compressor includes a frame (1), a deflection device (2), a clamping device (3), a welding torch (6), a welding torch moving device (4), and a welding torch cleaning device (5).

[0032] Combination Figure 4 , Figure 6 , Figure 7 , Figure 8The clamping device (3) is mounted on the deflection device (2) and is used to fix the workpiece. The clamping device (3) includes a jaw (31), a jaw mounting base (32), a rotating device (34) and a fixing frame (33). The jaw (31) is fixedly mounted on the jaw mounting base (32), and the jaw mounting base (32) is fixedly mounted on the fixing frame (33). The bottom of the jaw mounting base (32) is provided with a rotating device (34). The rotating device (34) includes a servo motor (7) and a hollow reducer (341). The servo motor (7) and the hollow reducer (341) are connected in a transmission to drive the jaw (31) to rotate. In this embodiment, the rotating device (34) is not located at the axial center of the gripper mounting base (32), but rather at an eccentric position. A hollow reducer (341) is installed inside the gripper mounting base (32), and the servo motor (7) is connected to the hollow reducer (341) for transmission, causing the rotating device (34) to drive the clamping device (3) to rotate along the axial center of the gripper mounting base (32). The number of grippers (31) is adjusted according to actual production. In this embodiment, there are three grippers (31), which are equidistantly arranged on the gripper mounting base (32) and mounted on the plane of the gripper mounting base (32) using screws. In this embodiment, the grippers (31) are L-shaped, with the short side of each gripper (31) mounted on the plane of the gripper mounting base (32) using screws.

[0033] In some embodiments, a shim can be added under the gripper (31) before it is screwed to the gripper mounting base (32) to achieve the effect of adjusting the height of the gripper (31).

[0034] Combination Figure 7 The gripper (31) has a gripper base block (311) and a segmented piece (312) on one end. The gripper base block (311) and the segmented piece (312) are respectively located on opposite sides of one end of the gripper (31). The gripping surface of the gripper base block (311) forms a contour with the workpiece surface. In this embodiment, the gripping surface of the gripper base block (311) is U-shaped. The segmented piece (312) can be installed on the same side as the gripper base block (311) or it can be segmented. The segment pick (312) and the gripper base block (311) are installed on opposite sides. By changing the combination of the segment pick (312) and the gripper base block (311), the size of the workpiece that the gripper (31) can hold can be changed. For example, if the workpiece diameter is small, the outer segment pick (312) is removed and installed on the inner side of the gripper base block (311), so that the gripper base block (311) moves closer to the center of the circle formed by the gripper (31) and can hold workpieces with smaller diameters.

[0035] Combination Figure 4 , Figure 6 , Figure 7 , Figure 8 A deflection device (2) is mounted on the frame (1) and is used to deflect the clamping device (3) from the vertical direction to the horizontal direction at an angle between 30 and 60 degrees. The deflection device (2) includes a mounting base (21), a connecting part (211), a servo motor (7) and a reducer. The servo motor (7) and the reducer are connected in a transmission manner. The connecting part (211) is fixedly mounted on the mounting base (21). The bottom of the fixed frame (33) is provided with a rotating shaft (331). The rotating shaft (331) is connected in a transmission manner to the connecting part (211). The servo motor (7) and the reducer pass through the connecting part (211) and are connected in a transmission manner to the rotating shaft (331) to drive the fixed frame (33) to deflect around the rotating shaft (331) as the axis. A cross roller bearing is provided between the connecting part (211) and the rotating shaft part (331) so that the fixed frame (33) can move at a uniform speed when it deflects, and reduce the fatigue effect caused by reciprocating motion. The number of connecting parts (211) and rotating shaft parts (331) corresponds to the number of connecting parts (211) and rotating shaft parts (331) is not less than two. The number of power units composed of servo motor (7) and reducer is not less than two.

[0036] In this embodiment, a deflection device (2) drives two clamping devices (3), which are called a set of workpiece action devices. In the same frame (1) environment, two sets of workpiece action devices can be set. In some embodiments, a deflection device (2) can drive more than two clamping devices (3), and in the same frame (1) environment, more than two sets of workpiece action devices can be set.

[0037] A slide plate (332) is provided below the clamping device (3). The wires that are electrically connected to the servo motor (7) extend outward from the slide plate (332). The number of slide plates (332) corresponds to the number of clamping devices (3).

[0038] Combination Figures 1 to 5 The welding torch moving device (4) is mounted on the frame (1) and is used to drive the welding torch (6) to reciprocate in three-axis directions. The welding torch moving device (4) includes a first moving mechanism (41), a second moving mechanism (42), a third moving mechanism (43) and a mounting panel (44). The first moving mechanism (41) is equipped with a servo motor (7), a first guide rail (411) and a mounting panel (44). The first guide rail (411) is connected to the servo motor (7) for transmission. The mounting panel (44) is mounted on the first guide rail (411). The second moving mechanism (42) and the third moving mechanism (43) are mounted on the mounting panel (44). The positions of the first moving mechanism (41), the second moving mechanism (42) and the third moving mechanism (43) and the reciprocating movement direction correspond to the three axes of Y, X and Z.

[0039] In this embodiment, the second moving mechanism (42) is disposed below the mounting panel (44). The second moving mechanism (42) includes a servo motor (7) and a second guide rail (421). The second guide rail (421) is drivenly connected to the servo motor (7). The third moving mechanism (43) is drivenly connected to the second guide rail (421). The mounting panel (44) is provided with a through slot (441). Slide rails (442) are provided on the upper and lower sides of the through slot (441). 2) A third moving mechanism (43) is provided on the device. A cantilever (431) is provided on the third moving mechanism (43). The cantilever (431) extends into the device through the through groove (441). A vertically downward welding torch (6) is provided at the end of the cantilever (431). The second moving mechanism (42) drives the third moving mechanism (43) to reciprocate along the slide rail (442) on the X-axis. The third moving mechanism (43) controls the extension of the cantilever (431) and thus controls the position of the welding torch (6) on the Z-axis.

[0040] In this embodiment, the third moving mechanism (43) uses manual control of the extension amount of the cantilever (431). The third moving mechanism (43) also includes a cantilever panel (435) and a clamping block (434). The cantilever (431) is inserted into the cantilever panel (435). By controlling the extension length of the cantilever (431) to the outside through the cantilever panel (435) and using the clamping block (434) to clamp and fix it, the extension amount of the cantilever (431) into the device is changed, thereby controlling the position of the welding torch (6) on the Z-axis. The cantilever (431) is provided with a second cantilever (432), and the second cantilever (432) is provided with a fixing device (433). The fixing device (433) is perpendicular to the second cantilever (432). The second cantilever (432) is deflected from the vertical direction to the horizontal direction. The deflection angle of the second cantilever (432) is complementary to the deflection angle of the deflection device (2). When the welding torch (6) is in the welding position, the fixing device (433) and the clamping device (3) together press and fix the workpiece to prevent the workpiece to be welded from falling off.

[0041] Combination Figure 5A welding torch cleaning device (5) is mounted on the frame (1) and is used to maintain and clean the welding torch (6). The welding torch cleaning device (5) includes a fixed plate (51), a wire cutting mechanism (57), a torch cleaning mechanism, and a torch cleaning retraction telescopic mechanism. The torch cleaning retraction telescopic mechanism includes a rotating cylinder (53) and a rotating part (52). The rotating cylinder (53) and the rotating part (52) are both fixedly mounted on the frame (1). The fixed plate (51) is fixedly connected to the rotating cylinder (53) and the rotating part (52) respectively. The three are connected in a triangular connection structure. The fixed plate (51) can rotate around the pivot at the fixed point between the rotating part (52) and the frame (1). The wire cutting mechanism (57) and the gun cleaning mechanism are mounted on the fixed plate (51) for rotation. When the welding gun (6) needs to be cleaned, the rotating cylinder (53) extends and rotates the welding gun cleaning device (5) away from the frame (1) around the axis of rotation of the rotating part (52) and the fixed position of the frame (1). When the welding gun (6) does not need to be cleaned, the rotating cylinder (53) retracts and rotates the welding gun cleaning device (5) back towards the frame (1) around the axis of rotation of the rotating part (52) and the fixed position of the frame (1).

[0042] Combination Figure 5 The fixing plate (51) is provided with a welding gun clamp (54) for clamping the welding gun (6). The fixing plate (51) is provided with a positioning hole (511). The welding gun clamp (54) passes through the positioning hole (511) and is fixedly installed on the fixing plate (51). In this embodiment, there are multiple positioning holes (511). The positioning holes (511) are arranged vertically from high to low at intervals. According to the production situation, positioning holes (511) of different heights are used to fix the welding gun clamp (54). A cleaning mechanism is provided below the welding torch clamp (54). The cleaning mechanism includes a pneumatic motor (55) and a reamer (56). The pneumatic motor (55) is connected to the reamer (56) in a transmission. The reamer (56) is equipped with an oil spraying mechanism. When the welding torch (6) needs to be cleaned, the welding torch (6) is placed in the welding torch clamp (54). Then, the welding torch is driven vertically downward by the welding torch moving device (4) and engages with the reamer (56). Then, the pneumatic motor (55) drives the reamer (56) to rotate, so that the impurities on the welding torch (6) are removed, and at the same time, the welding torch (6) is sprayed with oil.

[0043] Combination Figure 5 The wire cutting mechanism (57) is located on one side of the fixed plate (51). In this embodiment, the wire cutting mechanism (57) is located next to the cleaning mechanism, and the top of the wire cutting mechanism (57) is equipped with pliers. When the welding torch (6) needs to be cleaned, the welding torch (6) is moved above the cleaning mechanism by the welding torch moving device (4). After aligning the position of the reamer (56), the welding torch moving device (4) drives the welding torch (6) to be placed into the reamer (56), and the cleaning mechanism performs the cleaning operation.

[0044] When the welding torch (6) needs to perform a wire cutting operation, the welding torch (6) is moved above the wire cutting mechanism (57) by the welding torch moving device (4). After the wire cutting position is aligned, the welding torch moving device (4) drives the welding torch (6) to be placed into the wire cutting mechanism (57), and the wire cutting mechanism (57) performs the wire cutting operation.

[0045] In each implementation step of this embodiment, the welding torch (6) is always in a vertically downward state.

[0046] The terms "first," "second," etc., used in this invention do not indicate any order, quantity, or importance, but are merely for distinction. Similarly, the terms "one," "a," etc., used in this invention do not indicate a limitation on quantity, but rather indicate the existence of at least one of the mentioned objects. Terms indicating direction or location, such as "top," "bottom," "side," "longitudinal," "lateral," "middle," "center," "outer," "inner," "horizontal," "vertical," "left," "right," "above," "below," etc., indicate relative positions, not absolute positions.

[0047] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A device for circumferential welding of the upper and lower covers of a compressor, characterized in that: It includes a frame (1), a deflection device (2), a clamping device (3), a welding torch (6), a welding torch moving device (4), and a welding torch cleaning device (5). A clamping device (3) is provided on the deflection device (2) and is used to fix the workpiece; A deflection device (2) is mounted on the frame (1) and is used to deflect the clamping device (3) from the vertical direction to the horizontal direction at an angle between 30 and 60 degrees. The welding torch moving device (4) is mounted on the frame (1) and is used to drive the welding torch (6) to reciprocate in the three-axis direction; The welding torch (6) is mounted on the welding torch moving device (4) and kept in a vertical position for welding workpieces; The welding torch cleaning device (5) is located on the frame (1) and is used to maintain and clean the welding torch (6).

2. The device for circumferential welding of the upper and lower covers of a compressor according to claim 1, characterized in that: The clamping device (3) includes a gripper (31), a gripper mounting base (32), a rotating device (34), and a fixed frame (33). The gripper (31) is fixedly mounted on the gripper mounting base (32), and the gripper mounting base (32) is fixedly mounted on the fixed frame (33). The bottom of the gripper mounting base (32) is provided with a rotating device (34). The rotating device (34) includes a servo motor and a hollow reducer (341). The servo motor and the hollow reducer (341) are connected in a transmission to drive the gripper (31) to rotate.

3. The device for circumferential welding of the upper and lower covers of a compressor according to claim 2, characterized in that: The gripper (31) is provided with a gripper base block (311) and a segmented piece (312) at one end. The gripper base block (311) and the segmented piece (312) are respectively arranged on both sides of one end of the gripper (31). The clamping surface of the gripper base block (311) forms a contour with the surface of the workpiece. The segmented piece (312) can be installed on the same side as the gripper base block (311). The size of the workpiece that the gripper (31) can clamp can be changed by changing the combination of the segmented piece (312) and the gripper base block (311).

4. The device for circumferential welding of the upper and lower covers of a compressor according to claim 2, characterized in that: The deflection device (2) includes a mounting base (21), a connecting part (211), a servo motor and a reducer. The servo motor and the reducer are connected in a transmission manner. The connecting part (211) is fixedly mounted on the mounting base (21). The bottom of the fixed frame (33) is provided with a rotating shaft (331). The rotating shaft (331) is connected in a transmission manner to the connecting part (211). The servo motor and the reducer pass through the connecting part (211) and are connected in a transmission manner to the rotating shaft (331) to drive the fixed frame (33) to deflect around the rotating shaft (331) as the axis.

5. The apparatus for circumferential welding of the upper and lower covers of a compressor according to claim 1, characterized in that: The welding torch cleaning device (5) includes a fixed plate (51), a wire cutting mechanism (57), a torch cleaning mechanism, and a torch cleaning retraction telescopic mechanism. The wire cutting mechanism (57) and the torch cleaning mechanism are both mounted on the fixed plate (51). The torch cleaning retraction telescopic mechanism includes a rotating cylinder (53) and a rotating part (52). The rotating cylinder (53) and the rotating part (52) are both fixedly mounted on the frame (1). The fixed plate (51) is connected to the rotating cylinder (53) and the rotating part (52) respectively, so that the fixed plate (51), the rotating part (52), and the rotating cylinder (53) are connected in a triangular shape, so that the fixed plate (51) rotates around the rotating part (52) as the axis. When the welding torch (6) needs to be cleaned, the rotating cylinder (53) extends and pushes out the welding torch cleaning device (5). When the welding torch (6) does not need to be cleaned, the rotating cylinder (53) retracts and retracts the welding torch cleaning device (5).

6. The apparatus for circumferential welding of the upper and lower covers of a compressor according to claim 5, characterized in that: The fixed plate (51) is provided with a welding gun clamp (54) for holding the welding gun (6). The fixed plate (51) is provided with a positioning hole (511). The welding gun clamp (54) passes through the positioning hole (511) and is fixedly mounted on the fixed plate (51). A cleaning mechanism is provided below the welding gun clamp (54). The cleaning mechanism includes a pneumatic motor (55) and a reamer (56). The pneumatic motor (55) is connected to the reamer (56) for transmission. The reamer (56) is provided with an oil spraying mechanism. When cleaning the welding gun (6), the welding gun (6) is inserted into the welding gun clamp (54) and then placed vertically downward into the reamer (56). The pneumatic motor (55) drives the reamer (56) to work and clean the welding gun (6).

7. The apparatus for circumferential welding of the upper and lower covers of a compressor according to claim 1, characterized in that: The welding torch moving device (4) includes a first moving mechanism (41), a second moving mechanism (42), a third moving mechanism (43), and a mounting panel (44). The first moving mechanism (41) is equipped with a servo motor and the mounting panel (44). The second moving mechanism (42) and the third moving mechanism (43) are mounted on the mounting panel (44). The positions of the first moving mechanism (41), the second moving mechanism (42), and the third moving mechanism (43) and their reciprocating directions correspond to the three axes of Y, X, and Z.

8. The apparatus for circumferential welding of the upper and lower covers of a compressor according to claim 7, characterized in that: The mounting panel (44) is provided with a through slot (441), and slide rails (442) are provided on both sides of the through slot (441). A third moving mechanism (43) is provided on the slide rails (442), and a cantilever (431) is provided on the third moving mechanism (43). The cantilever (431) extends through the through slot (441) into the device. A vertically downward welding torch (6) is provided at the end of the cantilever (431). The third moving mechanism (43) is connected to the second moving mechanism (42) in a transmission connection. The second moving mechanism (42) drives the third moving mechanism (43) to move horizontally back and forth on the slide rail (442). The third moving mechanism (43) controls the extension amount of the cantilever (431), thereby controlling the position of the welding torch (6) on the Z-axis.

9. The apparatus for circumferential welding of the upper and lower covers of a compressor according to claim 8, characterized in that: The cantilever (431) is provided with a second cantilever (432), and the second cantilever (432) is provided with a fixing device (433). The fixing device (433) is perpendicular to the second cantilever (432). The second cantilever (432) is deflected from the vertical direction to the horizontal direction. The deflection angle of the second cantilever (432) is complementary to the deflection angle of the deflection device (2).

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