Motor welding fixture and welding method

Abstract

The present invention discloses a motor welding fixture and a welding method, which relates to the technical field of motor welding, and solves the technical problems that the operation is inconvenient when welding the inside of a motor casing and an end cover, and the welding gun is difficult to align, which affects the quality of the inside welding; the fixture comprises a welding table, and the top of the welding table is evenly distributed with limiters for limiting the motor casing and the motor end cover, and a transmission mechanism for driving the limiters to rotate is installed in the welding table, and a guide extending into the motor end cover is penetrated in the welding table, and the part of the guide away from the motor end cover extends to the outside of the welding table, and a moving part for installing a welding gun is slidably arranged on the guide part, and a positioning mechanism for limiting the position of the welding gun is arranged on the moving part. The present invention not only facilitates the double welding of the inside and outside of the annular gap between the motor casing and the motor end cover, but also ensures that the welding gun is always aligned with the annular gap, which is conducive to improving the welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of motor welding, and in particular to a motor welding fixture and a welding method. Background Art

[0002] Submersible motors are important equipment that work underwater. Their housings need to have good welding strength and sealing properties to ensure that they can operate safely and stably in underwater environments. The annular welding between the end cover and the housing is a key process in the submersible motor housing structure, which directly affects its overall performance.

[0003] A motor housing welding device is disclosed in the Chinese patent publication number CN113941808B. The rotating motor drives the turntable to rotate, the welding gun rotates around the dome, and the welding head moves around the junction between the dome and the housing. When the welding gun welds one end of the distance, the fixed cylinder is started, the piston rod of the fixed cylinder is shortened, the fixed block is separated from the dome, the rotating motor continues to drive the turntable to rotate, and the welding head continues to move around the junction between the dome and the housing. When the welding head rotates around the dome once, the junction between the dome and the housing is completely welded, which greatly improves the production efficiency of the motor housing and reduces the labor cost. However, this technical solution still has the following defects: Although the outer welding between the casing and the end cover of the submersible motor can provide a preliminary structural connection and basic waterproof function, the outer welding alone is not enough to completely ensure that the inside of the motor is not affected by water. The inner welding can further improve the welding sealing and welding strength. However, due to the limited space inside the casing, the inner welding is not only difficult to operate, but also it is difficult for the welder to directly see the annular gap formed between the casing and the end cover in the narrow space, which makes it difficult for the welding gun to always keep it aligned with the annular gap, thus affecting the welding quality. Summary of the invention

[0004] The purpose of the present invention is to provide a motor welding fixture and a welding method, which solves the problems of inconvenient operation when welding the inside between a motor housing and an end cover, and difficulty in aligning a welding gun, which affects the quality of the inside welding.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a motor welding fixture, comprising a welding table, wherein the top of the welding table is evenly distributed with limit members for limiting a motor casing and a motor end cover, a transmission mechanism for driving the limit members to rotate is installed in the welding table, and a guide member extending into the motor end cover is passed through the welding table, and a portion of the guide member away from the motor end cover extends to the outside of the welding table, a movable member for installing a welding gun is slidably provided on the guide member, a positioning mechanism for limiting the position of the welding gun is provided on the movable member, and an adjustment mechanism for adjusting the position of the guide member is installed on the welding table.

[0007] As a further solution of the present invention: the welding table includes a base and a cylinder seat installed on the top of the base, the cylinder seat is used to support the motor housing, and the cylinder seat is provided with a slot for the moving part and the positioning mechanism to pass through.

[0008] As a further solution of the present invention: the guide member includes an electric slide rail with a U-shaped structure, the movable member includes an electric slider, the electric slide rail includes a first vertical portion, a transition portion and a second vertical portion connected in sequence, the first vertical portion is located on the outside of the welding table, and the second vertical portion extends from one end of the transition portion to the inside of the motor end cover.

[0009] As a further solution of the present invention: the adjustment mechanism includes a telescopic frame, a first cylinder and a second cylinder, the telescopic frame is composed of a T-shaped inner plug-in plate and a sleeve plate, the T-shaped inner plug-in plate is slidably plugged into the sleeve plate, the sleeve plate is fixedly installed on the top of the base, the first cylinder is installed at the top side wall of the T-shaped inner plug-in plate, the piston rod of the first cylinder passes through the T-shaped inner plug-in plate and is connected to the guide member, the second cylinder is installed at the outer side wall of the sleeve plate, and the piston rod of the second cylinder is connected to the T-shaped inner plug-in plate.

[0010] As a further solution of the present invention: the limiting member includes a friction member and a rotating member, the rotating member passes through the top of the cylinder seat and extends downward, and the rotating member is rotatably connected to the top of the cylinder seat, and the friction member is sleeved on the rotating member located on the outer side of the cylinder seat.

[0011] As a further solution of the present invention: the positioning mechanism includes a shell sleeve with a through groove, a scale bar and a locking knob, the shell sleeve is an inverted T-shaped structure, and the shell sleeve is connected to the side of the moving part away from the welding gun, the scale bar is slidably connected to the shell sleeve, and the locking knob is used to lock the position of the scale bar.

[0012] As a further solution of the present invention: the top end of the T-shaped inner plug-in plate is rotatably connected to a transverse plate via a pin shaft, a third cylinder is installed on the top of the transverse plate, and a pressure plate for pressing the motor end cover is rotatably installed on the piston rod of the third cylinder.

[0013] As a further solution of the present invention: the friction part includes a sleeve, a keyway and an elastic sleeve, the elastic sleeve is fixedly mounted on the sleeve, and the keyway is opened on the inner wall of the sleeve; the rotating part includes a rotating shaft and a limit key, the limit key is installed on the outer wall of the rotating shaft, and the limit key is plugged into the keyway.

[0014] As a further solution of the present invention: the transmission mechanism includes a gear, an outer gear ring, a connecting frame and a motor, the gear is fixedly sleeved on the bottom end side wall of the rotating shaft, the outer gear ring is meshed with the gear, the connecting frame is installed in the outer gear ring, the motor is installed at the bottom of the base, and the motor is used to drive the connecting frame to rotate.

[0015] The second aspect of the present invention provides a motor welding method, which is applied to the above-mentioned motor welding fixture, and includes the following steps: S1: placing the motor casing to be welded on the top of the cylinder seat, measuring the depth of the motor end cover to be welded, and placing the motor end cover on the top of the motor casing, at this time, a ring gap is formed between the motor casing and the motor end cover; S2: putting a friction member whose size is compatible with the motor casing on the rotating member, centering and limiting the motor casing and the motor end cover, and controlling the lifting and lowering of the guide member by using the adjustment mechanism so that the top of the second vertical part of the guide member is located in the motor end cover; S3: adjusting the scale bar to slide along the shell sleeve until the scale number displayed on the scale bar is equal to the depth of the motor end cover measured in step S, and the position of the scale bar can be locked by using the locking knob;

[0016] S4: Use the moving part to drive the welding gun to move along the guide part until the welding gun is aligned with the annular gap, start the transmission mechanism to drive the limit part to rotate, so that the motor housing and the motor end cover rotate synchronously, and the welding gun can be used to complete the outer side welding of the annular gap; S5: After completing the outer side welding, the moving part continues to move along the guide part until the scale bar contacts the top inner wall of the motor end cover. At this time, the welding gun is aligned with the annular gap again, and the welding gun can be used to complete the inner side welding of the annular gap.

[0017] Beneficial effects of the present invention:

[0018] 1. In the present invention, a plurality of limiting members are used to conveniently perform centering and limiting on the motor casing and the motor end cover, a transmission mechanism is used to conveniently drive the plurality of limiting members to drive the motor casing and the motor end cover to rotate, a guide member is used to conveniently drive a moving member on which a welding gun is installed to move along it, thereby facilitating adjustment of the welding gun position, a positioning mechanism is used to conveniently limit the position of the welding gun, and the welding gun can be aligned with the annular gap between the motor casing and the motor end cover, thereby improving the welding quality of the inner and outer sides of the annular gap.

[0019] 2. In the present invention, by replacing friction parts of different sizes, it is convenient to limit the motor casings and motor end covers of different outer diameters, and the adjustment mechanism is used to conveniently control the lifting or left and right movement of the guide parts, thereby facilitating the annular welding of motor casings and motor end covers of different outer diameters, which is beneficial to improving applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a motor welding fixture of the present invention;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of a motor welding fixture of the present invention when in use;

[0023] Figure 3 It is a stereoscopic diagram of the connection part between the positioning mechanism and the guide member in a motor welding fixture of the present invention;

[0024] Figure 4 It is a three-dimensional diagram of a positioning mechanism in a motor welding fixture of the present invention;

[0025] Figure 5 It is a top view structural schematic diagram of a transmission mechanism in a motor welding fixture of the present invention;

[0026] Figure 6 It is a stereoscopic diagram of the connection part between the motor and the welding table in a motor welding fixture of the present invention;

[0027] Figure 7 It is a three-dimensional diagram of a limiting member in a motor welding fixture of the present invention;

[0028] Figure 8 It is a three-dimensional diagram of a friction member in a motor welding fixture of the present invention;

[0029] Fig. 9 It is a stereoscopic diagram of a rotating part in a motor welding fixture of the present invention.

[0030] In the figure: 1, welding table; 11, base; 12, cylinder seat; 2, limiter; 21, friction member; 211, shaft sleeve; 212, keyway; 213, elastic sleeve; 22, rotating member; 221, rotating shaft; 222, limiter key; 3, transmission mechanism; 31, gear; 32, outer gear ring; 33, connecting frame; 34, motor; 4, guide member; 41, first vertical portion; 42, transition portion; 43, second vertical portion; 44. Limit column; 5. Welding gun; 6. Moving part; 7. Positioning mechanism; 71. Through slot; 72. Shell; 73. Scale bar; 74. Locking knob; 75. Pressure sensor; 8. Adjustment mechanism; 81. Telescopic frame; 811. T-shaped inner plug-in plate; 812. Sleeve plate; 82. First cylinder; 83. Second cylinder; 84. Cross plate; 85. Third cylinder; 86. Pressure plate; 9. Motor housing; 10. Motor end cover. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-9 As shown, the present invention is a motor welding fixture, including a welding table 1, the top of the welding table 1 is evenly distributed with limit members 2 for limiting a motor casing 9 and a motor end cover 10, a transmission mechanism 3 is installed in the welding table 1 for driving the limit members 2 to rotate, and a guide member 4 extending into the motor end cover 10 is penetrated in the welding table 1, and a portion of the guide member 4 away from the motor end cover 10 extends to the outside of the welding table 1, a moving member 6 for installing a welding gun 5 is slidably provided on the guide member 4, a positioning mechanism 7 for limiting the position of the welding gun 5 is provided on the moving member 6, and an adjustment mechanism 8 for adjusting the position of the guide member 4 is installed on the welding table 1.

[0033] It should be noted that, when in use, a plurality of stoppers 2 are used to center and stop the motor housing 9 and the motor end cover 10 to be welded, and the adjustment mechanism 8 is used to lift and lower the guide member 4 so that one end of the guide member 4 is located in the motor end cover 10, and the moving member 6 is used to drive the welding gun 5 to move along the guide member 4. When the welding gun 5 is aligned with the annular gap between the motor housing 9 and the motor end cover 10, the transmission mechanism 3 is used to drive the stopper 2 to rotate, so that the motor housing 9 and the motor end cover 10 can rotate by themselves, and the outer side welding of the annular gap is completed;

[0034] By measuring the depth of the motor end cover 10 to be welded, the welding gun 5 can be moved to the inside of the motor housing 9 in cooperation with the positioning mechanism 7 and automatically aligned with the annular gap, thereby facilitating welding on the inner side of the annular gap and ensuring the welding quality of the inner side.

[0035] like Figure 1-2 As shown, the welding table 1 includes a base 11 and a cylinder seat 12 installed on the top of the base 11. The cylinder seat 12 is used to support the motor housing 9, and a slot 121 is opened on the cylinder seat 12 for the moving part 6 and the positioning mechanism 7 to pass through.

[0036] It should be noted that the cartridge seat 12 is an internal hollow structure, and the slot 121 consists of a transverse notch portion and a longitudinal notch portion. The transverse notch portion is opened at the top of the cartridge seat 12, and the longitudinal notch portion is opened at the side wall of the cartridge seat 12. The transverse notch portion is connected to the longitudinal notch portion, and the overall structure is in the shape of a "7".

[0037] like Figure 1-3 As shown, the guide member 4 includes an electric slide rail with a U-shaped structure, and the movable member 6 includes an electric slider. The sliding of the electric slider along the electric slide rail is a prior art and will not be elaborated here. The electric slide rail includes a first vertical portion 41, a transition portion 42 and a second vertical portion 43 which are connected in sequence. The first vertical portion 41 is located on the outside of the welding table 1, and the second vertical portion 43 extends from one end of the transition portion 42 to the motor end cover 10. In this embodiment, the length of the second vertical portion 43 is less than the length of the first vertical portion 41.

[0038] It should be noted that, in order to prevent the welding gun 5 from colliding with the inner wall of the motor housing 9 during the inner welding process, in this embodiment, a limiting column 44 ( Figure 3 As shown in the figure, the length of the limiting column 44 is slightly larger than the length of the welding gun 5. When the limiting column 44 is in contact with the inner wall of the motor end cover 10, the welding gun 5 is close to the annular gap (this spacing is suitable for welding). In addition, the limiting column 44 can also prevent the moving part 6 and the guide part 4 from slipping.

[0039] like Figure 1-2 As shown, the adjustment mechanism 8 includes a telescopic frame 81, a first cylinder 82 and a second cylinder 83. The telescopic frame 81 is composed of a T-shaped inner plug-in plate 811 and a sleeve plate 812. The T-shaped inner plug-in plate 811 is slidably plugged with the sleeve plate 812. The sleeve plate 812 is fixedly installed on the top of the base 11. The first cylinder 82 is installed on the top side wall of the T-shaped inner plug-in plate 811. The piston rod of the first cylinder 82 penetrates the T-shaped inner plug-in plate 811 and is connected to the guide member 4. The second cylinder 83 is installed on the outer side wall of the sleeve plate 812, and the piston rod of the second cylinder 83 is connected to the T-shaped inner plug-in plate 811.

[0040] It should be noted that, due to the differences in the sizes of the motor housing 9 and the motor end cover 10 of submersible motors of different models, starting the second cylinder 83 can make the T-shaped inner plate 811 slide and rise and fall along the sleeve plate 812, thereby facilitating the lifting and lowering of the guide member 4, ensuring that one end of the guide member 4 can extend into the motor end cover 10, and starting the first cylinder 82 facilitates the control of the left and right movement of the guide member 4, ensuring that when welding the outside or inside of the annular gap, the welding gun 5 can maintain a suitable welding distance with the annular gap, which is conducive to ensuring the welding quality.

[0041] like Figure 1-2 As shown, the top of the T-shaped inner plug-in plate 811 is rotatably connected to a transverse plate 84 via a pin shaft, a third cylinder 85 is installed on the top of the transverse plate 84, and a pressure plate 86 for pressing the motor end cover 10 is rotatably installed on the piston rod of the third cylinder 85.

[0042] It should be noted that starting the third cylinder 85 to drive the pressure plate 86 to press the motor end cover 10 can ensure the stability of the position of the motor end cover 10, which is beneficial to improving the welding stability. The pin shaft is used to facilitate the position rotation of the cross plate 84, thereby avoiding obstruction to the placement of the motor housing 9 and its motor end cover 10.

[0043] like Figure 2 and Figure 7 As shown, the limiting member 2 includes a friction member 21 and a rotating member 22. The rotating member 22 passes through the top of the cartridge seat 12 and extends downward, and the rotating member 22 is rotatably connected to the top of the cartridge seat 12. The friction member 21 is sleeved on the rotating member 22 located on the outer portion of the cartridge seat 12.

[0044] It should be noted that in order to facilitate the centering and limiting of motor casings 9 and motor end covers 10 with different outer diameters, the friction member 21 in this embodiment can be replaced with different sizes as needed to ensure that the friction member 21 can be pressed against the outer wall of the motor casing 9 and the motor end cover 10, and the friction member 21 and the rotating member 22 are detachably connected.

[0045] like Figure 7-9 As shown, the friction member 21 includes a sleeve 211, a keyway 212 and an elastic sleeve 213, the elastic sleeve 213 is fixedly sleeved on the sleeve 211, and the keyway 212 is opened on the inner wall of the sleeve 211; the rotating member 22 includes a rotating shaft 221 and a limit key 222, the limit key 222 is installed on the outer wall of the rotating shaft 221, and the limit key 222 is plugged into the keyway 212.

[0046] It should be noted that in order to ensure that friction parts 21 of different sizes can be docked and installed with the rotating part 22, in this embodiment, the sizes of the sleeve 211 and the keyway 212 of the friction parts 21 of different sizes do not change, the cross-sectional diameter of the elastic sleeve 213 can be changed, and the limit key 222 is plugged into the keyway 212, which not only facilitates the disassembly, assembly and replacement of the friction part 21, but also ensures that the rotating part 22 drives the friction part 21 to rotate synchronously.

[0047] like Figure 3-4 As shown, the positioning mechanism 7 includes a shell 72 with a through slot 71, a scale bar 73 and a locking knob 74. The shell 72 is an inverted T-shaped structure, and the shell 72 is connected to the side of the moving part 6 away from the welding gun 5. The scale bar 73 is slidably plugged into the shell 72, and the locking knob 74 is used to lock the position of the scale bar 73.

[0048] It should be noted that, in order to facilitate the welding gun 5 to remain aligned with the annular gap when it is inside the motor housing 9, in this embodiment, the tip of the welding gun 5 and the bottom of the shell 72 are located at the same horizontal plane, and according to the scale value of the scale bar 73, the distance between the bottom of the scale bar 73 and the bottom of the shell 72 is ensured to be equal to the depth of the motor end cover 10. When the scale bar 73 fits the inner wall of the top end of the motor end cover 10, the welding gun 5 can be automatically aligned with the annular gap;

[0049] In addition, in order to ensure that the moving member 6 automatically stops sliding after the welding gun 5 is aligned with the annular gap, in this embodiment, a pressure sensor 75 ( Figure 4 As shown in the figure, the lower surface of the pressure sensor 75 is flush with the bottom end of the scale bar 73, and the pressure sensor 75 and the moving member 6 are electrically connected to an external controller (not shown in the figure) through wires.

[0050] like Figure 2 and 5 -6, the transmission mechanism 3 includes a gear 31, an outer gear ring 32, a connecting frame 33 and a motor 34. The gear 31 is fixedly mounted on the bottom side wall of the rotating shaft 221, the outer gear ring 32 is meshed with the gear 31, the connecting frame 33 is installed in the outer gear ring 32, the motor 34 is installed at the bottom of the base 11, and the motor 34 is used to drive the connecting frame 33 to rotate.

[0051] It should be noted that the starting motor 34 drives the outer ring gear 32 installed with the connecting frame 33 to rotate. During the rotation of the outer ring gear 32, the multiple gears 31 meshing with it are driven to rotate, so that the rotating shaft 221 drives the friction member 21 to rotate synchronously. The friction member 21 can be used to drive the motor housing 9 and its motor end cover 10 that are in contact with it to rotate synchronously, which is convenient for realizing annular welding.

[0052] An embodiment of the present invention provides a motor welding method, comprising the following steps: S1: placing a motor casing 9 to be welded on the top of a cylinder seat 12, measuring the depth of a motor end cover 10 to be welded, and placing the motor end cover 10 on the top of the motor casing 9, at which time an annular gap is formed between the motor casing 9 and the motor end cover 10; S2: mounting a friction member 21 whose size matches the motor casing 9 on a rotating member 22, centering and limiting the motor casing 9 and the motor end cover 10, and controlling the lifting and lowering of the guide member 4 by an adjusting mechanism 8, so that the top of the second vertical portion 43 of the guide member 4 is located in the motor end cover 10; S3: adjusting the scale bar 73 to slide along the shell sleeve 72 until the scale number displayed on the scale bar 73 is equal to the depth of the motor end cover 10 measured in step S1, and then the position of the scale bar 73 can be locked by a locking knob 74;

[0053] S4: Use the moving part 6 to drive the welding gun 5 to move along the guide part 4 until the welding gun 5 is aligned with the annular gap, start the transmission mechanism 3 to drive the limit part 2 to rotate, so that the motor housing 9 and the motor end cover 10 rotate synchronously, and cooperate with the welding gun 5 to complete the outer side welding of the annular gap; S5: After completing the outer side welding, the moving part 6 continues to move along the guide part 4 until the scale bar 73 conflicts with the top inner wall of the motor end cover 10. At this time, the welding gun 5 is aligned with the annular gap again, and the welding gun 5 can be used to complete the inner side welding of the annular gap.

[0054] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A motor welding fixture, comprising a welding table (1), characterized in that: The top of the welding table (1) is evenly distributed with stoppers (2) for limiting the motor housing (9) and the motor end cover (10), the welding table (1) is provided with a transmission mechanism (3) for driving the stoppers (2) to rotate, and the welding table (1) is provided with a guide member (4) extending into the motor end cover (10), the guide member (4) extending away from the motor end cover (10) to the outside of the welding table (1), a moving member (6) for installing a welding gun (5) is slidably provided on the guide member (4), a positioning mechanism (7) for limiting the position of the welding gun (5) is provided on the moving member (6), and an adjustment mechanism (8) for adjusting the position of the guide member (4) is installed on the welding table (1); The guide member (4) comprises an electric slide rail with a U-shaped structure, the moving member (6) comprises an electric slider, the electric slide rail comprises a first vertical portion (41), a transition portion (42) and a second vertical portion (43) which are connected in sequence, the first vertical portion (41) is located outside the welding table (1), and the second vertical portion (43) extends from one end of the transition portion (42) to the inside of the motor end cover (10); The welding table (1) comprises a base (11) and a cartridge seat (12) mounted on the top of the base (11); the cartridge seat (12) is used to support a motor housing (9); and a slot (121) is provided on the cartridge seat (12) for the moving member (6) and the positioning mechanism (7) to pass through; the cartridge seat (12) is an internal hollow structure; the slot (121) is composed of a transverse notch portion and a longitudinal notch portion; the transverse notch portion is provided on the top of the cartridge seat (12); the longitudinal notch portion is provided on the side wall of the cartridge seat (12); the transverse notch portion is connected to the longitudinal notch portion, and the overall structure is in the shape of a letter "7"; The adjustment mechanism (8) comprises a telescopic frame (81), a first cylinder (82) and a second cylinder (83); the telescopic frame (81) is composed of a T-shaped inner plug-in plate (811) and a sleeve plate (812); the T-shaped inner plug-in plate (811) and the sleeve plate (812) are slidably plugged into each other; the sleeve plate (812) is fixedly mounted on the top of the base (11); the first cylinder (82) is mounted on the top side wall of the T-shaped inner plug-in plate (811); a piston rod of the first cylinder (82) penetrates the T-shaped inner plug-in plate (811) and is connected to the guide member (4); the second cylinder (83) is mounted on the outer side wall of the sleeve plate (812); and a piston rod of the second cylinder (83) is connected to the T-shaped inner plug-in plate (811); The positioning mechanism (7) comprises a shell (72) having a through slot (71), a scale bar (73) and a locking knob (74); the shell (72) is an inverted T-shaped structure, and the shell (72) is connected to a side of the moving part (6) away from the welding gun (5); the scale bar (73) is slidably plugged into the shell (72); and the locking knob (74) is used to lock the position of the scale bar (73).

2. A motor welding fixture according to claim 1, characterized in that: The limiting member (2) comprises a friction member (21) and a rotating member (22); the rotating member (22) penetrates the top of the cartridge seat (12) and extends downward, and the rotating member (22) is rotatably connected to the top of the cartridge seat (12); the friction member (21) is sleeved on the rotating member (22) and is located on the outer side of the cartridge seat (12).

3. The motor welding fixture according to claim 1, characterized in that: The top end of the T-shaped inner plug plate (811) is rotatably connected to a transverse plate (84) via a pin shaft, a third cylinder (85) is mounted on the top of the transverse plate (84), and a pressure plate (86) for pressing the motor end cover (10) is rotatably mounted on the piston rod of the third cylinder (85).

4. A motor welding fixture according to claim 2, characterized in that: The friction member (21) comprises a shaft sleeve (211), a key slot (212) and an elastic sleeve (213); the elastic sleeve (213) is fixedly sleeved on the shaft sleeve (211); the key slot (212) is formed on the inner wall of the shaft sleeve (211); the rotating member (22) comprises a rotating shaft (221) and a limit key (222); the limit key (222) is mounted on the outer wall of the rotating shaft (221), and the limit key (222) is plugged into the key slot (212).

5. A motor welding fixture according to claim 4, characterized in that: The transmission mechanism (3) comprises a gear (31), an outer gear ring (32), a connecting frame (33) and a motor (34); the gear (31) is fixedly sleeved on the bottom side wall of the rotating shaft (221); the outer gear ring (32) is meshed with the gear (31); the connecting frame (33) is installed in the outer gear ring (32); the motor (34) is installed at the bottom of the base (11); and the motor (34) is used to drive the connecting frame (33) to rotate.

6. A motor welding method, using the motor welding fixture described in claim 1, characterized in that: The following steps are involved: S1: placing the motor housing (9) to be welded on the top of the cylinder seat (12), measuring the depth of the motor end cover (10) to be welded, and placing the motor end cover (10) on the top of the motor housing (9), at which time an annular gap is formed between the motor housing (9) and the motor end cover (10); S2: a friction member (21) whose size matches that of the motor housing (9) is mounted on the rotating member (22), the motor housing (9) and the motor end cover (10) are centered and limited, and the guide member (4) is controlled to rise and fall by using the adjustment mechanism (8) so that the top end of the second vertical portion (43) of the guide member (4) is located inside the motor end cover (10); S3: adjusting the scale bar (73) to slide along the housing (72) until the scale number displayed on the scale bar (73) is equal to the depth of the motor end cover (10) measured in step S1, and then the position of the scale bar (73) can be locked by using the locking knob (74); S4: Using the moving member (6) to drive the welding gun (5) to move along the guide member (4) until the welding gun (5) is aligned with the annular gap, starting the transmission mechanism (3) to drive the limiting member (2) to rotate, so that the motor housing (9) and the motor end cover (10) rotate synchronously, and the outer side of the annular gap can be welded in cooperation with the welding gun (5); S5: After the outer side welding is completed, the moving member (6) continues to move along the guide member (4) until the scale bar (73) contacts the inner wall of the top end of the motor end cover (10). At this time, the welding gun (5) is aligned with the annular gap again, and the inner side welding of the annular gap can be completed by using the welding gun (5).

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