A combined projection welding process and device for a refrigeration compressor housing

Abstract

The present invention discloses a combined projection welding process for a refrigeration compressor housing, and discloses a method of combined welding of multiple workstations through one device and one process. For metal workpieces with different shapes, materials, positions, etc., the combined projection welding of the housing assembly is completed by performing one-time clamping and positioning welding on the housing through a combined projection welding device for the refrigeration compressor housing, which is easy to realize an automated projection welding production line; a combined projection welding device for a refrigeration compressor housing is also disclosed. By setting a combined power head with a combined power piston and a pushing device inside, an upper electrode seat and a lower electrode seat, the clamping and projection welding operations of multiple workpieces are realized simultaneously, effectively accelerating the production rhythm and improving production efficiency; by setting a combined power piston and multiple pushing devices at the tops of different upper electrodes, and lower electrodes with different depths at the lower electrode seat, the welding quality of simultaneous projection welding of different workpieces is improved, and the energy consumption and manufacturing cost of the device are reduced.

Description

Technical Field

[0001] The invention relates to a projection welding device, in particular to a combined projection welding process and device for a refrigeration compressor housing. Background Art

[0002] The upper shell of the refrigeration compressor needs to be welded with multiple metal parts during the processing. In the past, brazing was used to weld them one by one. This process method requires a large working area, high welding cost, high energy consumption, low efficiency, and pollutes the environment. The existing projection welding process for compressor shell processing is a resistance welding method that first pre-processes one or more raised points on the fitting surface of a workpiece to be welded, and then contacts, pressurizes, heats and collapses the surface of another workpiece to form welds. However, this method requires multiple equipment and multiple processes to complete the projection welding operation when facing metal workpieces of different shapes, different materials, and different positions, and the production efficiency is low.

[0003] There are existing devices that use projection welding technology for welding. Chinese patent (CN201310727586.7) discloses a resistance welding process for compressor liquid storage tanks. The liquid storage tank is welded by using resistance welding technology. The upper shell of the liquid storage tank, the steel pipe and the copper pipe of the three workpieces made of different materials are welded at one time. Compared with the brazing process in the furnace, this welding method eliminates the tunnel furnace. The one-time welding of the three workpieces has the advantages of saving process steps and reducing welding costs compared with the step-by-step welding process in which the copper pipe and the steel pipe are pre-welded using the non-resistance welding process. It also meets the design requirements of the liquid storage tank that the steel pipe is provided inside to reduce material costs and the copper pipe is used outside to meet the product use structure. However, the one-time welding of the three workpieces of different materials involved in this process is to weld the three workpieces in the same position for connection, which is not suitable for projection welding of workpieces in different positions, different materials and different shapes. It still requires multiple processes to complete the welding of the workpieces of the compressor upper cover shell;

[0004] Existing projection welding devices capable of multi-station welding, the Chinese patent (CN201711050969.X) discloses a floating upper electrode structure capable of simultaneously projection welding multiple screws. The pressure rod is floatingly connected to the electrode connecting seat to simultaneously projection weld multiple screws. When there are differences in the heights of each point electrode or the thicknesses of the screws, the deviation in the height direction can be eliminated. Therefore, the requirement for the equal height of the screws and the electrodes is low while ensuring the welding quality. The number of its floating electrodes is not fixed, and each floating electrode is independent. Therefore, there is no fixed requirement for the position and number of the welding points, and it can adapt to the projection welding process of screws with different numbers and positions. By changing the number of adjusting gaskets, the position of the projection welding electrode in the horizontal direction can be adjusted to ensure the centering of the upper and lower electrodes and make the welding quality higher. However, all the parts projection welded by this upper electrode structure are screws, and the specification differences of the upper electrodes are small, so its application range is small and it cannot perform multi-station projection welding on workpieces other than screws, and cannot be directly applied to the welding of workpieces with different materials, shapes and sizes;

[0005] Existing projection welding devices capable of projection welding on the same welding surface, the Chinese patent (CN201811540766.3) discloses an automotive seat wire frame projection welding device. Below the control cabinet, multiple welding guns are suspended by a fixing device. The number and position of the electrodes on the welding guns correspond to the number and position of the welding points on the wire frame to be welded on the first clamping plate. Then, the PLC module controls the working position and discharge time of the electrodes on the welding guns, so that multiple electrodes discharge simultaneously for welding, and the welding efficiency is increased to more than three times the original. However, this device is suitable for welding the positions of multiple welding points on different planes. When applied to the welding of different welding points on the same plane, the angle adjustment operations of multiple welding guns during the welding process are cumbersome and the welding efficiency is not high. Summary of the Invention

[0006] The object of the present invention is to provide a combined projection welding process and device for a refrigeration compressor housing in view of the problems existing in the prior art.

[0007] To achieve the above object, in the first aspect, the embodiments of the present invention application provide a combined projection welding process for a refrigeration compressor housing, including the following steps:

[0008] S1. Process multiple working positions and clamping structures on the surface of the upper cover assembly, and position and place the upper cover assembly with multiple working positions on the lower electrode seat;

[0009] S2. Insert multiple metal workpieces into the corresponding working positions at one time through a combined power head or manually, and the bottom ends of the workpieces contact the lower electrodes inside the lower electrode seat;

[0010] S3. According to the processing requirements of different workpieces, the operation control device sets different downward pressures above the upper electrodes corresponding to different workpieces, and uses a combined power piston to press down multiple upper electrodes simultaneously, contacting the tops of the corresponding workpieces to form a closed current, thus completing the one-time projection welding operation of multiple metal workpieces.

[0011] Among them, in S2, the number of the metal workpieces is several, and the sizes, shapes and materials of the several metal workpieces are different from each other.

[0012] Preferably, in S1, the sizes and depths of multiple workstations are different from each other, and the workstations include processing holes and placement grooves.

[0013] Preferably, in S2, a convex ring is arranged on the outer side of the workpiece inserted into the processing hole, and the outermost diameter of the convex ring is larger than the diameter of the processing hole.

[0014] In order to implement the above-mentioned combined projection welding process for the refrigeration compressor housing, in a second aspect, an embodiment of the present invention provides a combined projection welding device for a refrigeration compressor housing, including a combined power head and a lower electrode seat. The combined power head is arranged directly above the lower electrode seat, a component conveying device is arranged between the combined power head and the lower electrode seat, a rotating mechanism is arranged on the outer side of the combined power head or the outer side of the lower electrode seat, an upper electrode seat is fixedly installed at the bottom end of the combined power head, a combined power piston is arranged inside the combined power head, an upper electrode is detachably installed inside the combined power piston, a clamping mechanism is arranged at the bottom end of the upper electrode, the outer side of the upper electrode runs through the bottom end of the combined power head and the upper electrode seat along its own length and is movably sleeved with the inner side of the upper electrode seat, a pushing device is arranged at the top end of the combined power piston, a lower electrode is arranged inside the top end of the lower electrode seat, the numbers of the upper electrode, the lower electrode and the pushing device are the same, the upper electrode and the lower electrode are respectively electrically connected to a power supply, and mutually fitting clamping structures are arranged inside the bottom end of the upper electrode seat and at the top end of the lower electrode seat. The clamping structures include inclined surfaces and grooves, and the inclined surfaces and grooves are distributed inside the bottom end of the upper electrode seat and at the top end of the lower electrode seat.

[0015] In some embodiments, the upper electrode includes a first upper electrode, a second upper electrode and a third upper electrode, the lower electrode includes a first lower electrode, a second lower electrode and a third lower electrode, the axes of the first upper electrode and the first lower electrode coincide with each other, the axes of the second upper electrode and the second lower electrode coincide with each other, and the axes of the third upper electrode and the third lower electrode coincide with each other.

[0016] In some embodiments, a telescopic assembly is fixedly installed between the inner side of the combined power piston and the outer side of the top end of the upper electrode, and the input end of the telescopic assembly is electrically connected to a control device.

[0017] Furthermore, in some embodiments, the pushing device includes cylinder push rods or electric push rods of different specifications.

[0018] Furthermore, in some embodiments, longitudinal guide rails are provided inside the upper electrode seat, and the outer sides of the longitudinal guide rails coincide with the outer sides of the upper electrodes in a sliding connection.

[0019] Furthermore, in some embodiments, the clamping mechanism is provided outside the bottom end of the upper electrode, and the clamping mechanism is a member made of an elastic material.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. By adopting a method of combined welding of multiple workstations through one device and one process, for metal workpieces with different shapes, materials, positions, etc., the combined projection welding device for the refrigeration compressor housing performs one-time clamping and positioning welding on the housing to complete the projection welding of the housing assembly, which is easy to realize an automated projection welding production line.

[0022] 2. By providing a combined power head with a combined power piston and a pushing device, an upper electrode seat and a lower electrode seat inside, and adopting a method of combined welding of multiple workstations through one device and one process, for multiple metal workpieces with different shapes, materials, positions, etc., one-time clamping and positioning welding is performed on the housing, and at the same time, the clamping and projection welding operations of multiple workpieces are realized, effectively accelerating the production rhythm and improving production efficiency;

[0023] 3. By providing a combined power piston and multiple pushing devices at the tops of different upper electrodes, and lower electrodes with different depths are provided on the lower electrode seat, different pressures are applied to metal parts with different shapes, materials, positions, etc. by each pair of upper and lower electrodes of the device, improving the welding quality of simultaneous projection welding of different workpieces and reducing the energy consumption and manufacturing cost of the device;

[0024] 4. By providing a telescopic assembly between different upper electrodes and the combined power piston, the device can not only perform simultaneous projection welding of multiple workstations, but also perform separate projection welding on the workpieces of a single workstation, improving the practicability of the device, facilitating secondary processing of unqualified products, and also facilitating adjustment of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an assembly schematic diagram according to Embodiment 1 of the present invention;

[0026] Figure 2 is a schematic diagram of the main internal structure according to Embodiment 1 of the present invention;

[0027] Figure 3 is a schematic diagram of the product structure according to Embodiment 1 of the present invention;

[0028] Figure 4 is Figure 3 Schematic cross-sectional structure diagram in the A-A direction of

[0029] Figure 5 is Figure 3 Schematic cross-sectional structure diagram in the B-B direction of

[0030] Figure 6 is Figure 3 Schematic cross-sectional structure diagram in the C-C direction of

[0031] In the figure: 1. Combined power head; 2. Upper electrode seat; 3. Upper cover assembly; 4. Lower electrode seat; 201. Combined power piston; 301. Suction pipe; 302. Screw; 303. Sealed terminal; 401. First lower electrode; 402. Second lower electrode; 403. Third lower electrode; 2011. First upper electrode; 2012. Second upper electrode; 2013. Third upper electrode. Specific embodiments

[0032] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] A combined projection welding process for a refrigeration compressor housing includes the following steps:

[0035] S1. Process multiple working positions and clamping structures on the surface of the upper cover assembly 3, and position and place the upper cover assembly 3 with multiple working positions on the surface on the lower electrode seat 4;

[0036] Transport the workpiece from the area of the processing station to the lower electrode seat 4 through a conveyor belt, keep the relative position of the workpiece and the conveyor belt unchanged during transportation, and use the engagement of the clamping structure to achieve rapid positioning of the workpiece when it is transported to the lower electrode seat 4.

[0037] S2. Insert multiple metal workpieces into the corresponding working positions at one time through the combined power head 1 or manually, and the bottom end of the workpiece contacts the lower electrode inside the lower electrode seat 4;

[0038] S3. According to the processing requirements of different workpieces, operate the control device to set different downward pressures above the corresponding upper electrodes of different workpieces, and use the combined power piston to press down multiple upper electrodes simultaneously to contact the top ends of the corresponding workpieces, forming a closed current to complete the one-time projection welding operation of multiple metal workpieces.

[0039] A rotating mechanism is assembled outside the lower electrode base 4, and the planar position of the combined power head 1 remains unchanged. Alternatively, a rotating mechanism is assembled outside the combined power head 1, and the planar position of the lower electrode base 4 remains unchanged. By using the upper electrode provided with a clamping mechanism and rotating the rotating mechanism, multiple metal workpieces are inserted into the corresponding workstations at one time from the area to be clamped. Without loosening, the downward pressure above different workpieces is adjusted, and simultaneous downward pressing is performed to complete the one-time projection welding operation.

[0040] In S2, the number of metal workpieces is several, and the sizes, shapes, and materials of the several metal workpieces are different. This process can, according to actual production requirements, achieve one-time clamping, positioning, and projection welding by changing the specifications of the pressing device and the upper and lower motors, and has a wide range of applications.

[0041] In S1, the sizes and depths of multiple workstations are different. The workstations include processing holes and placement grooves, and the shapes and sizes of the workstations change according to different metal workpieces, with a certain degree of modification freedom and can be directly applied to an automated projection welding production line.

[0042] In S2, a convex ring is provided on the outside of the workpiece inserted into the processing hole, and the outermost diameter of the convex ring is larger than the diameter of the processing hole.

[0043] The combined projection welding process for the refrigeration compressor housing provided by the present invention adopts a method of combined welding of multiple workstations through one device and one process. For multiple metal workpieces such as housing components, different shapes, different materials, and different positions, the combined projection welding device for the refrigeration compressor housing is used to perform one-time clamping and positioning welding on the housing to complete the projection welding of the housing components, which is easy to realize an automated projection welding production line and reduces the manufacturing cost.

[0044] As Figures 1 to 6As shown in the figure, a combined projection welding device for a refrigeration compressor housing includes a combined power head 1, an upper cover assembly 3, and a lower electrode base 4. The combined power head 1 is arranged directly above the upper cover assembly 3 and the lower electrode base 4. A component conveying device is arranged between the combined power head 1 and the lower electrode base 4. The upper cover assembly 3 is placed on the component conveying device. A rotating mechanism is arranged on the outer side of the combined power head 1 or the outer side of the lower electrode base 4. An upper electrode base 2 is fixedly installed at the bottom end of the combined power head 1. A combined power piston 201 is arranged inside the combined power head 1. An upper electrode is detachably installed inside the combined power piston 201. The outer side of the upper electrode penetrates through the bottom end of the combined power head 1 and the upper electrode base 2 along its own length and is movably sleeved with the inner side of the upper electrode base 2. A pressing device is arranged at the top end of the combined power piston 201. A metal workpiece is placed inside the top end of the upper cover assembly 3. A convex ring is arranged on the outer side of the metal workpiece. The outer side of the convex ring is in contact with the inner side of the upper cover assembly 3. The number of metal workpieces is several. A lower electrode is arranged inside the top end of the lower electrode base 4. The number of the upper electrode, the lower electrode, and the pressing device is the same as the number of metal workpieces. The upper electrode and the lower electrode are respectively electrically connected to a power supply. A positioning device is arranged inside the upper electrode base 2 and the lower electrode base 4. A clamping structure is arranged inside the bottom end of the upper electrode base 2 and the top end of the lower electrode base 4.

[0045] The combined power head 1, the combined power piston 201, the upper electrode base 2, and the lower electrode base 4 serve as the main projection welding mechanisms. The pressing device serves as the pressurizing power source. The positioning device serves as the calibration mechanism. The device adopts a method of combined welding of multiple workpieces in one device, one process, and multiple stations, and performs one-time clamping and positioning welding on metal components such as multiple housing components, different shapes, different materials, and different positions on the housing, effectively accelerating the production rhythm, streamlining the actual production process, and improving the production efficiency.

[0046] As Figure 2 shown, the metal workpiece includes a first workpiece, a second workpiece, and a third workpiece. The shapes, sizes, and dimensions of the first workpiece, the second workpiece, and the third workpiece are different from each other.

[0047] The settings of the shapes, sizes, and dimensions of the first workpiece, the second workpiece, and the third workpiece enable the device to simultaneously perform projection welding operations on the three components of the upper housing of the compressor, improving the practicability of the device.

[0048] As Figure 2As shown, the upper electrode includes a first upper electrode 2011, a second upper electrode 2012, and a third upper electrode 2013, and the lower electrode includes a first lower electrode 401, a second lower electrode 402, and a third lower electrode 403. The inner side of the bottom end of the first upper electrode 2011 and the inner side of the first lower electrode 401 are adapted to the outer sides of the upper and lower ends of the first workpiece, the inner side of the bottom end of the second upper electrode 2012 and the inner side of the second lower electrode 402 are adapted to the outer sides of the upper and lower ends of the second workpiece, and the inner side of the bottom end of the third upper electrode 2013 and the inner side of the third lower electrode 403 are adapted to the outer sides of the upper and lower ends of the third workpiece.

[0049] The adaptation settings of each group of upper and lower electrodes to the corresponding workpiece enable each group of electrodes to accurately clamp the upper and lower ends of the corresponding workpiece, facilitating the smooth progress of the subsequent projection welding process and being conducive to ensuring the quality of the welded finished product.

[0050] As Figure 1 and Figure 2 shown, the axes of the first upper electrode 2011, the first workpiece, and the first lower electrode 401 coincide with each other, the axes of the second upper electrode 2012, the second workpiece, and the second lower electrode 402 coincide with each other, and the axes of the third upper electrode 2013, the third workpiece, and the third lower electrode 403 coincide with each other.

[0051] The axis settings of each group of upper and lower electrodes to the corresponding workpiece enable the working positions of each group of electrodes and the corresponding workpiece to be on the same vertical line, which is conducive to the clamping of the corresponding workpiece by each group of electrodes and facilitates the smooth progress of the subsequent projection welding process.

[0052] As Figure 1 and Figure 2 shown, the positioning structure includes an inclined surface and a groove, and the inclined surface and the groove are distributed on the inner side of the bottom end of the upper electrode seat 2 and the top end of the lower electrode seat.

[0053] The setting of the positioning structure enables the device to automatically align each metal workpiece with the upper and lower electrodes suitable for it on the device when performing projection welding on the upper cover assembly 3, assisting the device in projection welding positioning.

[0054] Among them, a telescopic assembly is fixedly installed between the inner side of the combined power piston 201 and the outer side of the top end of the upper electrode, and the input end of the telescopic assembly is electrically connected to a control device.

[0055] The setting of the telescopic assembly enables each upper electrode to perform a separate pressurization operation, so as to perform pressure adjustment on a single workpiece and secondary processing of unqualified products, improving the practicability of the device.

[0056] As Figures 3 to 6As shown in the figure, a product produced by a combined projection welding device for a refrigeration compressor housing includes an upper cover assembly 3. An intake pipe 301, a screw 302, and a sealed terminal 303 are welded to the inner side of the top end of the upper cover assembly 3. A convex ring is provided on the outer side of the intake pipe 301, and the outer side of the convex ring is welded to the inner side of the upper cover assembly 3.

[0057] As Figure 3 and Figure 4 shown, the first workpiece is the intake pipe 301. As Figure 3 and Figure 5 shown, the second workpiece is the screw 302. As Figure 3 and Figure 6 shown, the third workpiece is the sealed terminal 303.

[0058] Working principle

[0059] The upper electrode and the lower electrode are connected to the power supply. According to the characteristics of workpieces made of different metals, the downward pressure of the pushing device corresponding to the workpiece is set through the control device. The upper cover assembly 3 pre-pressed at multiple stations in advance is placed on the component conveying device. The component conveying device transports the upper cover assembly 3 above the lower electrode seat 4. The positioning structure automatically aligns the upper cover assembly 3 with the upper electrode seat 2 and the lower electrode seat 4. The axes of each station and the corresponding upper electrode and lower electrode coincide. Each metal workpiece is placed in each station at one time through the clamping mechanism at the bottom end of the upper electrode. The pushing device presses down the combined power piston 201, so that all the upper electrodes press down simultaneously, and together with all the lower electrodes, clamp and heat-weld all the metal workpieces from both the upper and lower ends. After the workpiece cools down, the projection welding process can be completed, realizing the one-time clamping and projection welding process of multiple workpieces made of different metals by using a single device, one process, and multi-station combined welding method.

[0060] If the welding at some stations is not in place, the unqualified workpieces are placed on the lower electrode seat 4 for re-projection welding. It is possible to perform separate projection welding on the workpieces at a single station, improving the practicality of the device. While facilitating secondary processing, the operator can also determine whether the reason for the welding not being in place is due to insufficient downward pressure, and then make adjustments.

[0061] Embodiment 2

[0062] A combined projection welding device for a refrigeration compressor housing is improved on the basis of Embodiment 1: The pushing device includes cylinder push rods or electric push rods of different specifications.

[0063] The setting of the pushing device facilitates the control and adjustment of the pressure exerted by each upper electrode on the corresponding workpiece, which is beneficial to improving the welding quality of the device.

[0064] Embodiment 3

[0065] A combined projection welding device for a refrigeration compressor housing, which is improved on the basis of Embodiment 1: A longitudinal guide rail is provided inside the upper electrode holder 2, and the outer side of the longitudinal guide rail is slidably connected and overlapped with the outer side of the upper electrode.

[0066] The setting of the longitudinal guide rail restricts the movement trajectory of the upper electrode, so that each upper electrode always maintains a vertical state during the application of pressure, reducing the actual projection welding deviation of the device and being beneficial to improving the welding quality of the device.

[0067] Embodiment 4

[0068] A combined projection welding device for a refrigeration compressor housing, which is improved on the basis of Embodiment 1: A clamping mechanism is arranged on the outer side of the bottom end of the upper electrode, and the clamping mechanism is a component made of elastic material.

[0069] When picking up multiple workpieces, first make the top end of the workpiece abut against the inner side of the bottom end of the upper electrode. The elastic clamping mechanism can fix the position of the workpiece during the movement of the workpiece, facilitating the next step of downward projection welding operation.

[0070] Embodiment 5

[0071] A combined projection welding device for a refrigeration compressor housing, which is improved on the basis of Embodiment 1: An auxiliary positioning mechanism is arranged on the upper outer part of the lower electrode holder 4, which can gently lift the workpiece for a small rotation to prevent the workpiece from being misaligned when placed on the lower electrode holder 4.

[0072] Furthermore, a positioning hole is provided on the workpiece, and an infrared emitter and an infrared receiver are arranged at the corresponding positions of the upper electrode holder 2 and the lower electrode holder 4. When the infrared ray passes through the positioning hole and reaches the receiver, the positioning is completed. When misalignment occurs and the receiver cannot receive the infrared ray, the auxiliary positioning mechanism is activated or manual fine-tuning is performed to further improve the projection welding accuracy.

[0073] Embodiment 6

[0074] Based on the combined projection welding process and device for a refrigeration compressor housing in Embodiment 1, which is used for multi-station combined welding of the same processing surface. For the projection welding of products other than the refrigeration compressor housing, as long as the processing surfaces of each workpiece are the same within the working range of the upper electrode holder 2, it can be directly applied.

[0075] And when the processing surfaces of each workpiece are uneven within the working range of the upper electrode holder 2, it can be applied by changing the acting directions of the upper electrode and the pressing device, and the transformation cost is relatively small.

[0076] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined projection welding device for a refrigeration compressor housing, comprising a combined power head (1) and a lower electrode seat (4). The combined power head (1) is arranged directly above the lower electrode seat (4). A component conveying device is arranged between the combined power head (1) and the lower electrode seat (4). A rotating mechanism is arranged outside the combined power head (1) or outside the lower electrode seat (4). The bottom end of the combined power head (1) is fixedly installed with an upper electrode seat (2). Characterized in that a combined power piston (201) is arranged inside the combined power head (1). An upper electrode is detachably installed inside the combined power piston (201). A clamping mechanism for placing various metal workpieces into respective work positions at one time is arranged at the bottom end of the upper electrode. The outside of the upper electrode penetrates through the bottom end of the combined power head (1) and the upper electrode seat (2) along its own length and is movably sleeved with the inside of the upper electrode seat (2). A pressing device is arranged at the top end of the combined power piston (201). A lower electrode is arranged inside the top end of the lower electrode seat (4). The number of the upper electrodes, the lower electrodes and the pressing devices is the same. Each group of upper electrodes and lower electrodes is adapted to the corresponding workpiece, so that each group of electrodes can clamp the upper and lower ends of the corresponding workpiece. The upper electrode and the lower electrode are respectively electrically connected to a power supply. A clamping structure that fits each other is arranged inside the bottom end of the upper electrode seat (2) and at the top end of the lower electrode seat (4). The clamping structure includes an inclined surface and a groove, and the inclined surface and the groove are distributed inside the bottom end of the upper electrode seat (2) and at the top end of the lower electrode seat (4).

2. The combined projection welding device for a refrigeration compressor housing according to claim 1, Characterized in that the upper electrode includes a first upper electrode (2011), a second upper electrode (2012) and a third upper electrode (2013). The lower electrode includes a first lower electrode (401), a second lower electrode (402) and a third lower electrode (403). The axes of the first upper electrode (2011) and the first lower electrode (401) coincide with each other. The axes of the second upper electrode (2012) and the second lower electrode (402) coincide with each other. The axes of the third upper electrode (2013) and the third lower electrode (403) coincide with each other.

3. The combined projection welding device for a refrigeration compressor housing according to claim 1, Characterized in that a telescopic component is fixedly installed between the inside of the combined power piston (201) and the outside of the top end of the upper electrode. The input end of the telescopic component is electrically connected to a control device.

4. The combined projection welding device for a refrigeration compressor housing according to claim 1, Characterized in that the pressing device includes cylinder push rods or electric push rods of different specifications.

5. The combined projection welding device for a refrigeration compressor housing according to claim 1, Characterized in that longitudinal guide rails are arranged inside the upper electrode seat (2), and the outside of the longitudinal guide rails coincides with the outside of the upper electrode in a sliding connection.

6. The combined projection welding device for a refrigeration compressor housing according to claim 1, Characterized in that The clamping mechanism is arranged on the outer side of the bottom end of the upper electrode, and the clamping mechanism is a component made of elastic material.

7. A welding process using the combined projection welding device for a refrigeration compressor housing according to any one of claims 1-6, characterized in that it includes the following steps: S1. Process a plurality of working positions and clamping structures on the surface of the upper cover assembly (3), and position and place the upper cover assembly (3) with a plurality of working positions on the lower electrode seat (4); the sizes and depths of the plurality of working positions are different, and the working positions include processing holes and placement grooves; S2. Insert a plurality of metal workpieces into the corresponding working positions at one time through the combined power head (1) or manually, and the bottom ends of the workpieces contact the lower electrode on the inner side of the lower electrode seat (4); a convex ring is arranged on the outer side of the workpiece inserted into the processing hole, and the outermost diameter of the convex ring is larger than the diameter of the processing hole; S3. According to the processing requirements of different workpieces, operate the control device to set different downward pressures above the corresponding upper electrodes of different workpieces, and use the combined power piston to press down a plurality of upper electrodes simultaneously, contact the tops of the corresponding workpieces, form a closed current, and complete the one-time projection welding operation of a plurality of metal workpieces.

8. The welding process of the combined projection welding device for a refrigeration compressor housing according to claim 7, characterized in that in S2, the number of the metal workpieces is several, and the sizes, shapes and materials of the several metal workpieces are different.

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