A hollow piston processing device and method for an automobile air conditioner compressor

Abstract

The application provides a hollow piston processing device and processing method for an automobile air conditioner compressor, which comprises a base connected with a moving device, a clamping and rotating mechanism and a welding device, the welding device is connected with a buffer mechanism, the buffer mechanism comprises a sleeve, a first spring, a sliding rod and a push block, the moving device is connected with a preheating device, the preheating device comprises a first telescopic part, a second spring and two moving blocks, the two moving blocks are connected through a support block, the support block is connected with a rebound assembly, and the rebound assembly is connected with a heating device. The hollow piston is heated by the heating device, the worm is driven to rotate by the third motor, thereby driving the worm wheel, the clamping plate and the hollow piston to rotate, uniform preheating is realized, the fixed plate and the welding device are driven to descend by the air cylinder, the push block extrudes the moving block to move, thereby separating the fixed frame and the heating device from the jack, the welding device continuously descends into the jack to contact the hollow piston, and welding is realized.

Description

Technical Field

[0001] This invention mainly relates to the field of automotive air conditioning compressor technology, specifically to a hollow piston processing device and processing method for automotive air conditioning compressors. Background Technology

[0002] The automotive air conditioning compressor is the heart of the automotive air conditioning refrigeration system, playing the role of compressing and transporting refrigerant vapor. Compressors are divided into two types: fixed displacement and variable displacement. According to different working principles, air conditioning compressors can be divided into fixed displacement compressors and variable displacement compressors. The hollow piston is indispensable in this compressor, so a processing device is required when manufacturing the hollow piston.

[0003] In the existing technology for processing hollow pistons, the parts are manufactured and then welded together. However, manual welding can lead to errors, and hollow pistons are usually exposed to air during preheating, making it difficult to preheat them quickly or adequately, resulting in poor welding quality. Therefore, this invention provides a processing device and method for processing hollow pistons of automotive air conditioning compressors to solve the above problems. Summary of the Invention

[0004] This invention provides a processing device and method for hollow pistons in automotive air conditioning compressors to solve the technical problems mentioned in the background section.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a hollow piston processing device for an automotive air conditioning compressor, comprising a base, a moving device connected to the top of the base, a clamping and rotating mechanism connected to the top of the base, a welding device connected to the top of the base, and buffer mechanisms connected to both sides of the bottom of the welding device. The buffer mechanism includes a sleeve connected to the bottom of the welding device, a first spring connected to the top of the sleeve, a sliding rod connected to the bottom of the first spring, and a push block connected to the bottom of the sliding rod. The top of the sliding rod is slidably connected to the sleeve.

[0006] A preheating device is connected to one side of the top of the mobile device. The preheating device includes a first telescopic member connected to both sides of the top of the mobile device, a second spring sleeved on the first telescopic member, and a moving block connected to one side of the first telescopic member. The moving block cooperates with a push block. The two moving blocks are connected by a support block. A rebound assembly is connected to the bottom of the support block. A heating device is connected to the bottom of the rebound assembly.

[0007] In this invention, the first spring facilitates the upward movement of the push block and the reset of the push block; the second spring facilitates the reset of the moving block; the push block descends and presses against the moving block, facilitating the movement of the moving block; and the heating device facilitates the heating of the hollow piston, achieving preheating.

[0008] Furthermore, the moving device includes a first motor connected to one side of the top of the base, a one-way lead screw connected to the drive end of the first motor, and a placement platform that is threadedly connected to one side of the one-way lead screw. The placement platform has an arc-shaped groove on one side, and the arc of the arc-shaped groove is a superior arc.

[0009] In this invention, the rotation of the unidirectional lead screw facilitates the movement of the placement platform, which in turn facilitates the loading and unloading of the hollow piston.

[0010] Furthermore, a groove is provided on one side of the placement platform, and an insertion hole is provided on the top side of the placement platform, with the hole body of the insertion hole connected to the groove body of the groove.

[0011] In this invention, the groove prevents the protruding part at the weld of the hollow piston from colliding with the placement platform, thereby avoiding damage to the hollow piston.

[0012] Furthermore, a C-shaped frame is fixed to the top of the base, and a welding device is connected to the top of the C-shaped frame. The welding device includes a pneumatic cylinder connected to the top of the C-shaped frame and a fixed plate connected to the drive end of the pneumatic cylinder. Sleeves are connected to both sides of the fixed plate, and welding equipment is connected to the bottom of the fixed plate. The welding equipment is engaged with the insertion hole.

[0013] In this invention, the pneumatic cylinder facilitates the welding equipment to enter the socket and contact the hollow piston, thereby facilitating the welding of the hollow piston.

[0014] Furthermore, the clamping and rotating mechanism includes a second motor connected to one side of the bottom of the C-frame, a bidirectional lead screw connected to the drive end of the second motor, a support plate and a baffle connected to one side of the support plate, a clamping plate rotatably connected to the inner side of the support plate, and a rotating assembly connected to one side of the clamping plate.

[0015] In this invention, the rotation of the bidirectional lead screw facilitates the opposite movement of the two support plates and clamping plates, thereby fixing the hollow piston in place by the clamping plates.

[0016] Furthermore, the rotating assembly includes a worm gear connected to one side of the clamping plate, a worm gear meshing with the bottom of the worm gear, and a third motor connected to one side of the worm gear, with the clamping plate connected to one side of the third motor.

[0017] In this invention, the worm gear and worm cooperate to form a self-locking mechanism, preventing the clamping plate from rotating freely. The rotation of the clamping plate facilitates the rotation of the hollow piston, making it easier for the welding equipment to fully weld the hollow piston.

[0018] Furthermore, the rebound assembly includes a second telescopic member connected to both sides of the bottom of the support block, a third spring sleeved on the second telescopic member, and a fixing frame connected to the bottom of the second telescopic member. The bottom of the fixing frame is connected to a heating device, and a first inclined edge is provided on one side of the bottom of the fixing frame.

[0019] In this invention, the third spring facilitates the upward movement of the fixed frame and also facilitates the reset of the fixed frame.

[0020] Furthermore, a second inclined edge is provided on one side of the bottom of the push block;

[0021] The top side of the movable block is provided with a third inclined side, which cooperates with the second inclined side.

[0022] In this invention, the third inclined side is parallel to the second inclined side, and the cooperation between the third inclined side and the second inclined side facilitates the push block to squeeze the moving block.

[0023] Furthermore, one side of the baffle is provided with a slightly curved surface, one baffle is provided with positioning grooves on both sides, and the other baffle is fixed with positioning rods on both sides, the positioning rods being slidably connected to the grooves of the positioning grooves.

[0024] In this invention, the positioning rod and the positioning groove cooperate to improve the stability of the baffle and enable the two baffles to be aligned.

[0025] Based on the above technical solution for a hollow piston machining device for an automotive air conditioning compressor, a method for machining a hollow piston for an automotive air conditioning compressor will also be provided, including the following steps:

[0026] S1. First, place the two parts of the hollow piston at both ends of the placement platform. Move the placement platform by rotating the one-way screw and make it contact the baffle. Then, move the support plate by rotating the two-way screw, so that the clamp fixes the parts of the hollow piston. At this time, the two baffles are in contact, so that the connection between the two parts of the hollow piston is in a sealed space.

[0027] S2, heating the two components of the hollow piston using a heating device;

[0028] S3. After preheating is complete, the welding equipment and push block are lowered by the pneumatic cylinder. The push block presses the moving block to move it, thereby causing the heating equipment to disengage from the socket. Then the push block is kept stationary by the first spring. The welding equipment continues to descend and enters the socket to contact the two parts of the hollow piston, thus achieving welding.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] This invention utilizes a first motor to drive a unidirectional lead screw, thereby moving the placement platform until it contacts a baffle. A second motor drives a bidirectional lead screw, causing two support plates to move in opposite directions, thus positioning and fixing the hollow piston with a clamping plate. The hollow piston is heated by a heating device. A third motor drives a worm gear, which in turn rotates the worm wheel and clamping plate, facilitating the rotation of the hollow piston and achieving uniform preheating. A pneumatic cylinder lowers the fixing plate and welding equipment, and a pusher block presses against a moving block, causing the moving block to move and disengage the fixing frame and heating device from the insertion hole. The pusher block is then kept stationary by a first spring, while the welding equipment continues to descend and enters the insertion hole to contact the two components of the hollow piston. Welding is then performed by the welding equipment, while the clamping plate rotates the hollow piston, achieving comprehensive welding. This not only improves welding accuracy and work efficiency but also enables rapid and uniform preheating of the hollow piston, thereby improving welding quality.

[0031] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 3 This is a cross-sectional view of the entire invention;

[0035] Figure 4 This is a partial cross-sectional view of the entire invention;

[0036] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0037] Figure 6 This is a cross-sectional view of the entire invention.

[0038] In the diagram: 10. Base; 20. Moving device; 21. First motor; 22. One-way lead screw; 23. Placement platform; 231. Groove; 232. Insertion hole; 30. Welding device; 31. Pneumatic cylinder; 32. Fixing plate; 33. Welding equipment; 40. Buffer mechanism; 41. Sleeve; 42. First spring; 43. Slide rod; 44. Push block; 441. Second inclined side; 50. Clamping and rotating mechanism; 51. Second motor; 52. Two-way lead screw; 53. Support plate; 54. Baffle; 541. Positioning groove; 542. Positioning rod; 55. Clamping plate; 56. Rotating assembly; 561. Third motor; 562. Worm gear; 563. Worm wheel; 60. Preheating device; 61. First telescopic component; 62. Second spring; 63. Moving block; 631. Third inclined side; 64. Support block; 65. Rebound assembly; 651. Second telescopic component; 652. Third spring; 653. Fixed frame; 6531. First inclined side; 66. Heating equipment. Detailed Implementation

[0039] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] For an example, please refer to the appendix. Figure 1-6A hollow piston processing device for an automotive air conditioning compressor includes a base 10, a moving device 20 connected to the top of the base 10, a clamping and rotating mechanism 50 connected to the top of the base 10, a welding device 30 connected to the top of the base 10, and buffer mechanisms 40 connected to both sides of the bottom of the welding device 30. The buffer mechanism 40 includes a sleeve 41 connected to the bottom of the welding device 30, a first spring 42 connected to the top of the sleeve 41, a sliding rod 43 connected to the bottom of the first spring 42, and a push block 44 connected to the bottom of the sliding rod 43. The top of the sliding rod 43 is slidably connected to the sleeve 41.

[0043] The mobile device 20 is connected to a preheating device 60 on one side of its top. The preheating device 60 includes a first telescopic member 61 connected to both sides of the top of the mobile device 20, a second spring 62 sleeved on the first telescopic member 61, and a moving block 63 connected to one side of the first telescopic member 61. The moving block 63 cooperates with a push block 44. The two moving blocks 63 are connected by a support block 64. The bottom of the support block 64 is connected to a rebound assembly 65, and the bottom of the rebound assembly 65 is connected to a heating device 66.

[0044] It should be noted that in this embodiment, the first spring 42 facilitates the upward space of the push block 44 and enables the push block 44 to reset. The elastic force of the second spring 62 resets the moving block 63. The push block 44 descends and presses the moving block 63 to move the moving block 63, thereby moving the heating device 66. The heating device 66 facilitates the heating of the hollow piston to achieve preheating.

[0045] For an example, please refer to the appendix. Figure 2-3 The mobile device 20 includes a first motor 21 connected to one side of the top of the base 10, a one-way lead screw 22 connected to the drive end of the first motor 21, and a placement platform 23 connected to one side of the one-way lead screw 22. The placement platform 23 has an arc-shaped groove on one side, and the arc of the arc-shaped groove is a superior arc.

[0046] It should be noted that in this embodiment, the first motor 21 drives the one-way lead screw 22 to rotate, thereby moving the placement platform 23 to facilitate the loading and unloading of the hollow piston. The diameter of the arc groove is the same as the outer diameter of the hollow piston.

[0047] For an example, please refer to the appendix. Figure 3-4 The placement platform 23 has a groove 231 on one side and an insertion hole 232 on the top side of the placement platform 23. The hole of the insertion hole 232 is connected to the groove of the groove 231.

[0048] It should be noted that, in this embodiment, the groove 231 prevents the protruding part of the hollow piston welding point from colliding with the placement platform 23, thereby avoiding damage to the hollow piston. The insertion hole 232 facilitates the heating device 66 to heat the hollow piston and facilitates the insertion of the welding device 30 to weld the hollow piston.

[0049] For an example, please refer to the appendix. Figure 3 The base 10 has a C-shaped frame fixed on top, and a welding device 30 is connected to the top of the C-shaped frame. The welding device 30 includes a pneumatic cylinder 31 connected to the top of the C-shaped frame and a fixing plate 32 connected to the drive end of the pneumatic cylinder 31. Sleeves 41 are connected to both sides of the fixing plate 32, and a welding device 33 is connected to the bottom of the fixing plate 32. The welding device 33 cooperates with the insertion hole 232.

[0050] It should be noted that in this embodiment, the fixed plate 32 and the welding equipment 33 are driven to descend by the pneumatic cylinder 31, so that the welding equipment 33 enters the insertion hole 232 to contact the hollow piston, and then welds the hollow piston.

[0051] For an example, please refer to the appendix. Figure 2-3 The clamping and rotating mechanism 50 includes a second motor 51 connected to one side of the bottom of the C-shaped frame, a bidirectional lead screw 52 connected to the drive end of the second motor 51, a support plate 53 connected to both sides of the bidirectional lead screw 52, ​​and a baffle 54 connected to one side of the support plate 53. The inner side of the support plate 53 is rotatably connected to a clamping plate 55, and one side of the clamping plate 55 is connected to a rotating assembly 56.

[0052] It should be noted that in this embodiment, the second motor 51 drives the bidirectional lead screw 52 to rotate, thereby causing the two support plates 53 and clamping plates 55 to move in opposite directions, thereby fixing the hollow piston with the clamping plates 55, and the baffle 54 to restrict the position of the placement platform 23.

[0053] For an example, please refer to the appendix. Figure 2 The rotating assembly 56 includes a worm gear 563 connected to one side of the clamping plate 55, a worm 562 meshing with the bottom of the worm gear 563, and a third motor 561 connected to one side of the worm 562. The clamping plate 55 is connected to one side of the third motor 561.

[0054] It should be noted that in this embodiment, the worm gear 563 and the worm 562 cooperate to form a self-locking mechanism, preventing the clamping plate 55 from rotating freely. The third motor 561 drives the worm 562 to rotate, thereby driving the worm gear 563 and the clamping plate 55 to rotate, which facilitates the rotation of the hollow piston and makes it easier for the welding equipment 33 to fully weld the hollow piston.

[0055] For an example, please refer to the appendix. Figure 5 The rebound assembly 65 includes a second telescopic member 651 connected to both sides of the bottom of the support block 64, a third spring 652 sleeved on the second telescopic member 651, and a fixing frame 653 connected to the bottom of the second telescopic member 651. The bottom of the fixing frame 653 is connected to a heating device 66, and a first inclined side 6531 is provided on one side of the bottom of the fixing frame 653.

[0056] It should be noted that, in this embodiment, the third spring 652 provides upward space for the fixed frame 653 and enables the fixed frame 653 to return to its original position, allowing the heating device 66 to enter the insertion hole 232, thereby sealing the insertion hole 232. The first inclined side 6531 facilitates the pressing of the placement platform 23 when the fixed frame 653 moves, thus facilitating the upward movement of the fixed frame 653.

[0057] For an example, please refer to the appendix. Figure 3 The push block 44 has a second inclined edge 441 on one side of its bottom;

[0058] The moving block 63 has a third inclined side 631 on one side of its top, and the third inclined side 631 cooperates with the second inclined side 441.

[0059] It should be noted that in this embodiment, the third inclined side 631 is parallel to the second inclined side 441, and the cooperation between the third inclined side 631 and the second inclined side 441 facilitates the push block 44 to squeeze the moving block 63, thereby moving the moving block 63.

[0060] For an example, please refer to the appendix. Figure 6 The baffle 54 has a slightly curved surface on one side, and one baffle 54 has positioning grooves 541 on both sides. The other baffle 54 has positioning rods 542 fixed on both sides. The positioning rods 542 are slidably connected to the grooves of the positioning grooves 541.

[0061] It should be noted that in this embodiment, the positioning rod 542 and the positioning groove 541 cooperate to improve the stability of the baffle 54 and enable the two baffles 54 to be aligned, thus preventing the baffles 54 from bending or being damaged.

[0062] For an example, please refer to the appendix. Figure 1-6 Based on the above technical solution for a hollow piston machining device for an automotive air conditioning compressor, a method for machining a hollow piston for an automotive air conditioning compressor will also be provided, including the following steps:

[0063] S1. First, place the two parts of the hollow piston at both ends of the placement platform 23. Rotate the one-way screw 22 to move the placement platform 23 and make it contact the baffle 54. Then, rotate the two-way screw 52 to move the support plate 53, thereby fixing the hollow piston parts with the clamping plate 55. At this time, the two baffles 54 are in contact, so that the connection between the two parts of the hollow piston is in a sealed space.

[0064] S2, heating the two components of the hollow piston via heating device 66;

[0065] S3. After preheating is complete, the welding device 33 and push block 44 are driven to descend by the pneumatic cylinder 31. The push block 44 presses the moving block 63 to move, thereby causing the heating device 66 to disengage from the socket 232. Then the push block 44 is kept stationary by the first spring 42. The welding device 33 continues to descend and enters the socket 232 to contact the two parts of the hollow piston, thus achieving welding.

[0066] The specific operation of the present invention is as follows: First, the two components of the hollow piston are inserted into both ends of the placement platform 23. The first motor 21 drives the one-way lead screw 22 to rotate, thereby moving the placement platform 23 and bringing it into contact with the baffle 54. Then, the second motor 51 drives the two-way lead screw 52 to rotate, thereby moving the two support plates 53 and the clamping plate 55 in opposite directions. This allows the clamping plate 55 to position and fix the two components of the hollow piston. The baffle 54, the placement platform 23, the fixing frame 653, and the two components of the hollow piston cooperate to form a sealed space.

[0067] Then, the two components of the hollow piston are heated by the heating device 66. At the same time, the worm 562 is driven to rotate by the third motor 561, which in turn drives the worm wheel 563 and the clamping plate 55 to rotate, so that the hollow piston can rotate and achieve uniform preheating.

[0068] Then, the fixed plate 32 and the welding equipment 33 are driven to descend by the pneumatic cylinder 31. During the descent, the push block 44 first squeezes the moving block 63 to move the moving block 63, thereby causing the fixed frame 653 and the heating equipment 66 to disengage from the socket 232. Subsequently, the push block 44 is kept stationary by the first spring 42, and the welding equipment 33 continues to descend and enters the socket 232 to contact the two parts of the hollow piston.

[0069] Welding is performed using welding equipment 33, while the hollow piston is rotated by clamping plate 55 to achieve full welding.

[0070] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A hollow piston processing device for an automobile air conditioner compressor, comprising a base (10), characterized in that: The base (10) top is connected with a moving device (20), the base (10) top is connected with a clamping rotating mechanism (50), the base (10) top is connected with a welding device (30), the welding device (30) bottom is connected with a buffer mechanism (40) on both sides, the buffer mechanism (40) includes a sleeve (41) connected to the bottom of the welding device (30), a first spring (42) connected to the top of the sleeve (41), a sliding rod (43) connected to the bottom of the first spring (42) and a push block (44) connected to the bottom of the sliding rod (43), the sliding rod (43) top is slidingly connected with the sleeve (41); The moving device (20) top is connected with a preheating device (60) on one side, the preheating device (60) includes a first telescopic piece (61) connected to the top of the moving device (20) on both sides, a second spring (62) sleeved on the first telescopic piece (61) and a moving block (63) connected to one side of the first telescopic piece (61), the moving block (63) is matched with the push block (44), two moving blocks (63) are connected through a support block (64), the support block (64) bottom is connected with a rebound assembly (65), the rebound assembly (65) bottom is connected with a heating device (66); The base (10) top is fixed with a C-shaped frame, the clamping rotating mechanism (50) includes a second motor (51) connected to one side of the bottom of the C-shaped frame, a bidirectional screw rod (52) connected to the driving end of the second motor (51), a support plate (53) penetratingly connected to both sides of the bidirectional screw rod (52) and a baffle (54) connected to one side of the support plate (53), the support plate (53) is rotatably connected with a clamping plate (55) on the inner side, one side of the clamping plate (55) is connected with a rotating assembly (56); The rotating assembly (56) includes a worm wheel (563) connected to one side of the clamping plate (55), a worm shaft (562) meshingly connected to the bottom of the worm wheel (563) and a third motor (561) connected to one side of the worm shaft (562), one side of the third motor (561) is connected with the clamping plate (55); The rebound assembly (65) includes a second telescopic piece (651) connected to both sides of the bottom of the support block (64), a third spring (652) sleeved on the second telescopic piece (651) and a fixed frame (653) connected to the bottom of the second telescopic piece (651), the fixed frame (653) bottom is connected with a heating device (66), one side of the fixed frame (653) bottom is provided with a first inclined edge (6531).

2. The hollow piston machining device for an automobile air conditioner compressor according to claim 1, characterized in that: The moving device (20) includes a first motor (21) connected to one side of the top of the base (10), a unidirectional screw rod (22) connected to the driving end of the first motor (21) and a placement table (23) penetratingly connected to one side of the unidirectional screw rod (22), one side of the placement table (23) is provided with an arc-shaped groove, the arc of the arc-shaped groove is an optimal arc.

3. The hollow piston machining device for an automobile air conditioner compressor according to claim 2, characterized in that: The placing table (23) is provided with a groove (231) on one side, and is provided with a jack (232) on the top side.

4. The hollow piston machining device for an automobile air conditioner compressor according to claim 1, characterized in that: The C-shaped frame top is connected with a welding device (30), which comprises a pneumatic cylinder (31) connected with the C-shaped frame top and a fixed plate (32) connected with the driving end of the pneumatic cylinder (31), and sleeves (41) are connected to the two sides of the fixed plate (32), and a welding equipment (33) is connected to the bottom of the fixed plate (32), and the welding equipment (33) is matched with the jack (232).

5. The hollow piston machining device for an automobile air conditioner compressor according to claim 1, characterized in that: The bottom side of the push block (44) is provided with a second bevel (441). The top side of the moving block (63) is provided with a third bevel (631), which is matched with the second bevel (441).

6. The hollow piston machining device for an automobile air conditioner compressor according to claim 1, characterized in that: One side of the baffle (54) is provided with a concave surface, one side of the baffle (54) is provided with a positioning groove (541), and the other side of the baffle (54) is fixed with a positioning rod (542), and the positioning rod (542) is slidably connected with the groove body of the positioning groove (541).

7. A method for processing a hollow piston of an automobile air conditioner compressor, which is used for implementing the processing device of the hollow piston of the automobile air conditioner compressor according to any one of claims 1-6, characterized in that: The method comprises the following steps: S1, first, place the two parts of the hollow piston on the two ends of the placing table (23), rotate the one-way screw rod (22) to move the placing table (23) and make it contact with the baffle (54), then rotate the two-way screw rod (52) to move the supporting plate (53), so that the clamping plate (55) fixes the parts of the hollow piston, at this time, the two baffles (54) are in contact, and the connection of the two parts of the hollow piston is in the sealed space; S2, heat the two parts of the hollow piston by the heating equipment (66); S3, after preheating, the welding equipment (33) and the push block (44) are lowered by the pneumatic cylinder (31), the moving block (63) is moved by the push block (44) extruding the moving block (63), so that the heating equipment (66) is separated from the jack (232), then the push block (44) is kept stationary by the first spring (42), the welding equipment (33) continuously descends into the jack (232) and contacts with the two parts of the hollow piston, and welding is realized.

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