CN113894397A - Combined convex welding process and device for shell of refrigeration compressor - Google Patents

Abstract

The invention discloses a combined projection welding process of a shell of a refrigeration compressor, and discloses a method for combined welding through one device, one process and multiple stations, wherein for metal workpieces with different shapes, different materials, different positions and the like, the shell is clamped and positioned for welding through a combined projection welding device of the shell of the refrigeration compressor at one time to complete projection welding of a shell assembly, so that an automatic projection welding production line is easy to realize; the combined projection welding device for the shell of the refrigeration compressor is also disclosed, and the combined power head, the upper electrode holder and the lower electrode holder which are internally provided with the combined power piston and the pushing device are arranged, so that the clamping and projection welding operation of a plurality of workpieces is realized, the production beat is effectively accelerated, and the production efficiency is improved; the combined power piston and the plurality of pushing devices are arranged at the top ends of the different upper electrodes, and the lower electrodes with different depths are arranged on the lower electrode seat, so that the welding quality of projection welding of different workpieces simultaneously is improved, and the energy consumption and the manufacturing cost of the device are reduced.

Description

Combined convex welding process and device for shell of refrigeration compressor

Technical Field

The invention relates to a projection welding device, in particular to a combined projection welding process and a combined projection welding device for a shell of a refrigeration compressor.

Background

The upper shell of the refrigeration compressor needs to be welded with various metal parts in the machining process, the traditional welding adopts a brazing mode to be welded in sequence, the process method needs a large operation field, has high welding cost, high energy consumption and low efficiency, and also pollutes the environment.

A device for welding a liquid storage tank of a compressor by adopting a projection welding process is disclosed in Chinese patent (CN 201310727586.7). The welding of the liquid storage tank is completed by using the resistance welding process, the welding of an upper shell of the liquid storage tank made of different materials and three workpieces of a steel pipe and a copper pipe is completed at one time, compared with the brazing process in a furnace, a tunnel furnace is omitted in the welding method, the step-by-step welding process that the three workpieces are welded in advance by using the non-resistance welding process compared with the copper pipe and the steel pipe has the advantages of saving process steps and reducing welding cost, and the design requirements of the liquid storage tank on reducing the material cost by arranging the steel pipe inside and using the copper pipe outside to meet the use structure of a product are met Under the condition that workpieces with different shapes are subjected to projection welding, the workpieces of the compressor upper cover shell can be welded only by a plurality of working procedures;

the prior projection welding device capable of carrying out multi-station welding, Chinese patent (CN201711050969.X) discloses a floating upper electrode structure capable of simultaneously projection welding a plurality of screws, wherein the floating upper electrode structure is connected with an electrode connecting seat in a floating way through a pressure rod to simultaneously projection weld the plurality of screws, and when the heights of all point electrodes are different or the thicknesses of the screws are different, the deviation in the height direction can be eliminated, so that the requirement on the equal heights of the screws and the electrodes is low while the welding quality is ensured, the number of floating electrodes is not fixed, and all the floating electrodes are independent, so that the welding point positions and the number are not fixed, the projection welding screw technology with different numbers and positions can be adapted, the positions of the projection welding electrodes in the horizontal direction can be adjusted by changing the number of adjusting gaskets, the centering performance of the upper electrode and the lower electrode is ensured, but the upper electrode structure is projection welded by the screws, the upper electrode has small specification difference and small application range, cannot perform multi-station projection welding on workpieces except for the screw, and cannot be directly applied to welding workpieces of different materials, shapes and sizes;

the prior projection welding device capable of performing projection welding on the same welding surface, Chinese patent (CN201811540766.3) discloses projection welding equipment for a steel wire framework of an automobile seat, wherein a plurality of welding guns are hung below a control cabinet through a fixing device, the number and the positions of electrodes on the welding guns correspond to the number and the positions of welding spots on the steel wire framework to be welded on a first clamping disc, and then the working positions and the discharging time of the electrodes on the welding guns are controlled by a PLC module to enable the electrodes to discharge simultaneously for welding, so that the welding efficiency is improved to more than three times, but the device is suitable for welding the welding spot positions of a plurality of different planes, and when the device is applied to welding different welding spots on the same plane, the angle adjustment operation of the welding guns in the welding process is complex, and the welding efficiency is not high.

Disclosure of Invention

The invention aims to provide a compressor shell combination projection welding process and device aiming at the problems in the prior art.

In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a projection welding process for a shell assembly of a refrigeration compressor, including the following steps:

s1, processing a plurality of stations and a clamping structure on the surface of the upper cover component, and positioning the upper cover component with the plurality of stations on the surface on the lower electrode seat;

s2, inserting a plurality of metal workpieces into corresponding stations at one time through a combined power head or manually, and contacting the bottom ends of the workpieces with lower electrodes on the inner sides of the lower electrode seats;

and S3, setting different downward pressures above the upper electrodes corresponding to different workpieces by the operation control device according to the processing requirements of the different workpieces, and simultaneously pressing the upper electrodes down by using the combined power piston to contact the top ends of the corresponding workpieces to form closed current so as to finish the one-time projection welding operation of the metal workpieces.

In S2, the number of the metal workpieces is plural, and the size, shape, and material of the plural metal workpieces are different from each other.

Preferably, in S1, the plurality of stations, which include machining holes and placement grooves, are different in size and depth.

Preferably, in S2, a convex ring is provided outside the workpiece inserted into the machining hole, and the outermost diameter of the convex ring is larger than the diameter of the machining hole.

In order to realize the combined projection welding process of the refrigeration compressor shell, in a second aspect, the embodiment of the invention provides a combined projection welding device of the refrigeration compressor shell, which comprises a combined power head and a lower electrode seat, wherein the combined power head is arranged right above the lower electrode seat, an assembly conveying device is arranged between the combined power head and the lower electrode seat, a rotating mechanism is arranged outside the combined power head or outside the lower electrode seat, an upper electrode seat is fixedly arranged 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 arranged on the inner side of the combined power piston, a clamping mechanism is arranged at the bottom end of the upper electrode, the outer side of the upper electrode penetrates through the bottom end of the combined power head and the upper electrode seat along the length of the upper electrode and is movably sleeved with the inner side of the upper electrode seat, the combined power piston is characterized in that a pushing device is arranged at the top end of the combined power piston, a lower electrode is arranged on the inner side of the top end of the lower electrode holder, the upper electrode, the lower electrode and the pushing device are the same in quantity, the upper electrode and the lower electrode are respectively and electrically connected with a power supply, a clamping structure which is embedded with each other is arranged on the inner side of the bottom end of the upper electrode holder and the top end of the lower electrode holder, the clamping structure comprises an inclined plane and a groove, and the inclined plane and the groove are distributed on the inner side of the bottom end of the upper electrode holder and the top end of the lower electrode holder.

In some embodiments, the upper electrode comprises a first upper electrode, a second upper electrode and a third upper electrode, the lower electrode comprises 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 are coincident with each other, the axes of the second upper electrode and the second lower electrode are coincident with each other, and the axes of the third upper electrode and the third lower electrode are coincident with each other.

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 an input end of the telescopic assembly is electrically connected with a control device.

Further, in some embodiments, the pushing device comprises air cylinder push rods or electric push rods with different specifications.

Further, in some embodiments, the inner side of the upper electrode holder is provided with a longitudinal guide rail, and the outer side of the longitudinal guide rail and the outer side of the upper electrode are overlapped in a sliding connection.

Further, in some embodiments, the clamping mechanism is disposed outside the bottom end of the upper electrode, and the clamping mechanism is an elastic material member.

Compared with the prior art, the invention has the beneficial effects that:

1. the shell assembly projection welding is completed by adopting a method of one device, one process and multi-station combination welding to metal workpieces with different shapes, different materials, different positions and the like through one-time clamping and positioning welding on a shell by a refrigeration compressor shell combination projection welding device, and an automatic projection welding production line is easy to realize.

2. By arranging the combined power head, the upper electrode holder and the lower electrode holder which are internally provided with the combined power piston and the pushing device, a method of one device, one process and multi-station combined welding is adopted, a plurality of metal workpieces with different shapes, different materials, different positions and the like are clamped and welded on the shell at one time, the clamping and projection welding operation of the workpieces is realized, the production beat is effectively accelerated, and the production efficiency is improved;

3. the combined power piston and the plurality of pushing devices are arranged at the top ends of different upper electrodes, and the lower electrodes with different depths are arranged on the lower electrode seat, so that each pair of upper electrode and lower electrode of the device applies different pressures to metal parts with different shapes, different materials, different positions and the like, the welding quality of projection welding of different workpieces at the same time is improved, and the energy consumption and the manufacturing cost of the device are reduced;

4. through set up flexible subassembly between electrode and combination formula power piston on different, make the device can carry out projection welding when the multistation, can carry out projection welding alone to the work piece of single station again, improved the practicality of device, be favorable to carrying out secondary operation to unqualified product, also be convenient for adjust the device.

Drawings

FIG. 1 is a schematic assembly diagram according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of the main internal structure according to the first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a product according to a first embodiment of the invention;

FIG. 4 is a schematic view of the cross-sectional structure taken along the line A-A of FIG. 3;

FIG. 5 is a schematic view of the cross-sectional structure along the direction B-B in FIG. 3;

FIG. 6 is a schematic view of the cross-sectional structure of FIG. 3 taken along the direction C-C;

in the figure: 1. a combined power head; 2. an upper electrode mount; 3. an upper cover assembly; 4. a lower electrode holder; 201. a combined power piston; 301. an air intake duct; 302. a screw; 303. sealing the binding post; 401. a first lower electrode; 402. a second lower electrode; 403. a third lower electrode; 2011. a first upper electrode; 2012. a second upper electrode; 2013. and a third upper electrode.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A combined projection welding process for a shell of a refrigeration compressor comprises the following steps:

s1, processing a plurality of stations and clamping structures on the surface of the upper cover component 3, and positioning the upper cover component 3 with a plurality of stations on the surface on the lower electrode seat 4;

the workpiece is transported to the lower electrode holder 4 from the area of the processing station through the transport belt, the relative position of the workpiece and the transport belt is kept unchanged during the transportation, and the workpiece is quickly positioned by utilizing the joint of the clamping structure when being transported to the lower electrode holder 4.

S2, inserting a plurality of metal workpieces into corresponding stations at one time through the combined power head 1 or manually, and contacting the bottom ends of the workpieces with lower electrodes on the inner side of the lower electrode seat 4;

and S3, setting different downward pressures above the upper electrodes corresponding to different workpieces by the operation control device according to the processing requirements of the different workpieces, and simultaneously pressing the upper electrodes down by using the combined power piston to contact the top ends of the corresponding workpieces to form closed current so as to finish the one-time projection welding operation of the metal workpieces.

The outer side of the lower electrode seat 4 is provided with a rotating mechanism, the plane position of the combined power head 1 is unchanged, or the outer side of the combined power head 1 is provided with a rotating mechanism, the plane position of the lower electrode seat 4 is unchanged, a plurality of metal workpieces are inserted into corresponding stations at one time from a to-be-clamped area by the rotation of the rotating mechanism through the upper electrode provided with a clamping mechanism, the downward pressure above different workpieces is adjusted under the condition of not loosening, and the workpieces are pressed downward at the same time, so that the one-time projection welding operation can be completed.

In S2, the number of the metal workpieces is a plurality, the sizes, the shapes and the materials of the metal workpieces are different, the process can realize one-time clamping, positioning and projection welding by changing the specifications of the pressurizing device and the upper motor and the lower motor according to actual production requirements, and the practical range is wide.

In S1, the sizes and the depths of a plurality of stations are different, the stations comprise machining holes and placing grooves, the shapes and the sizes of the stations are changed according to different metal workpieces, certain modification freedom degree is provided, and the automatic projection welding production line can be directly applied to.

In S2, a convex ring is provided on the outer side of the workpiece inserted into the machining hole, and the outermost diameter of the convex ring is larger than the diameter of the machining hole.

The invention provides a combined projection welding process of a shell of a refrigeration compressor, which adopts a method of combining and welding a plurality of shell components, different shapes, different materials, different positions and other metal workpieces by one device, one process and a plurality of stations, and performs one-time clamping and positioning welding on the shell by a combined projection welding device of the shell of the refrigeration compressor to complete projection welding of the shell components, thereby easily realizing an automatic projection welding production line and reducing the manufacturing cost.

As shown in fig. 1 to 6, a combined projection welding device for a refrigeration compressor shell comprises a combined power head 1, an upper cover component 3 and a lower electrode holder 4, wherein the combined power head 1 is arranged right above the upper cover component 3 and the lower electrode holder 4, a component conveying device is arranged between the combined power head 1 and the lower electrode holder 4, the upper cover component 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 holder 4, an upper electrode holder 2 is fixedly arranged at the bottom end of the combined power head 1, a combined power piston 201 is arranged in the combined power head 1, an upper electrode is detachably arranged on the inner side of 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 holder 2 along the length of the outer side of the upper electrode and is movably sleeved with the inner side of the upper electrode holder 2, and a pushing device is arranged at the top end of the combined power piston 201, metal work has been placed to the inboard on 3 tops of upper cover subassembly, metal work's the outside is provided with the bulge loop, the outside of bulge loop and upper cover subassembly 3's inboard contact, metal work's quantity is a plurality of, the bottom electrode has been seted up to the inboard on 4 tops of bottom electrode seat, go up the electrode, the quantity of bottom electrode and thrust device is the same with metal work's quantity, go up electrode and bottom electrode electric connection respectively has the power, the inboard of going up electrode seat 2 and bottom electrode seat 4 is provided with positioner, go up the inboard of electrode seat 2 bottom and the top of bottom electrode seat 4 and seted up the screens structure.

The combined power head 1, the combined power piston 201, the upper electrode holder 2 and the lower electrode holder 4 are used as main projection welding mechanisms, the pushing device is used as a pressurizing power source, and the positioning device is used as a calibration mechanism, so that the device adopts a method of one-device one-step process and multi-station combined welding, and metal parts such as a plurality of shell components, different shapes, different materials, different positions and the like are clamped and positioned and welded on the shell once, the production beat is effectively accelerated, the actual production process is simplified, and the production efficiency is improved.

As shown in fig. 2, the metal workpieces include a first workpiece, a second workpiece, and a third workpiece, and the first workpiece, the second workpiece, and the third workpiece are different in size and shape.

The shapes, sizes and sizes of the first workpiece, the second workpiece and the third workpiece are set, so that the device can simultaneously perform projection welding operation on three components of the upper shell of the compressor, and the practicability of the device is improved.

As shown in fig. 2, 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 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.

The upper electrode and the lower electrode of each group are matched with the corresponding workpiece, so that the upper end and the lower end of the corresponding workpiece can be accurately clamped by the electrodes of each group, the subsequent projection welding process can be smoothly carried out, and the quality of a welded finished product can be ensured.

As shown in fig. 1 and 2, 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.

The axes of the upper electrode and the lower electrode of each group and the corresponding workpiece are arranged, so that the stations of the electrodes of each group and the corresponding workpiece are positioned on the same vertical line, and the clamping of the electrodes of each group on the corresponding workpiece is facilitated, so that the subsequent projection welding process can be smoothly carried out.

As shown in fig. 1 and 2, the locking structure includes an inclined plane and a groove, and the inclined plane and the groove are distributed on the inner side of the bottom end of the upper electrode holder 2 and the top end of the lower electrode holder.

The arrangement of the clamping structure enables each metal workpiece to automatically align the upper electrode and the lower electrode which are matched with the upper electrode on the device when the device performs projection welding on the metal workpieces on the upper cover component 3, and the auxiliary device performs projection welding positioning.

Wherein, a telescopic component 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 component is electrically connected with a control device.

The arrangement of the telescopic assembly enables each upper electrode to be capable of carrying out independent pressurization operation, so that the pressurization adjustment of a single workpiece and the secondary processing of unqualified products are carried out, and the practicability of the device is improved.

As shown in fig. 3 to 6, a product produced by using the projection welding device combined with the refrigeration compressor shell comprises an upper cover assembly 3, wherein an air suction pipe 301, a screw 302 and a sealing wiring terminal 303 are welded on the inner side of the top end of the upper cover assembly 3, a projection ring is arranged on the outer side of the air suction pipe 301, and the outer side of the projection ring is welded on the inner side of the upper cover assembly 3.

As shown in fig. 3 and 4, the first workpiece is a suction pipe 301, as shown in fig. 3 and 5, the second workpiece is a screw 302, as shown in fig. 3 and 6, and the third workpiece is a sealing post 303.

Principle of operation

The upper electrode and the lower electrode are communicated with a power supply, the downward pressure of a pushing device corresponding to the workpiece is set through a control device according to the characteristics of workpieces made of different metals, an upper cover component 3 with a plurality of stations pre-pressed in advance is placed on a component conveying device, the component conveying device conveys the upper cover component 3 to the position above a lower electrode seat 4, a clamping structure automatically enables the upper cover component 3 to be automatically aligned with an upper electrode seat 2 and a lower electrode seat 4, each station is superposed with the axes of the upper electrode and the lower electrode which are matched with each station, each metal workpiece is placed in each station at one time through a clamping mechanism at the bottom end of the upper electrode, the pushing device enables a combined power piston 201 to be pressed downward, all the upper electrodes are pressed downward simultaneously, all the metal workpieces are clamped from the upper end and the lower end together with all the lower electrodes for heating welding, the projection welding process can be completed after the workpieces are cooled, and the application of one device is realized, The one-step clamping projection welding process of a plurality of different metal workpieces is carried out by a multi-station combination welding method in one working procedure.

If some stations of emergence welding are not in place, put unqualified work piece on lower electrode holder 4, carry out projection welding again, can carry out projection welding alone to the work piece of single station, improved the practicality of device, when being convenient for carry out secondary operation, operating personnel also can judge whether the reason that the welding is not in place is because the holding down force is not enough to adjust.

Example 2

The combined projection welding device for the shell of the refrigeration compressor is improved on the basis of the embodiment 1: the pushing device comprises air cylinder push rods or electric push rods with different specifications.

The pushing device is convenient to control and adjust the pressure applied to the corresponding workpiece by each upper electrode, and the welding quality of the device is improved.

Example 3

The combined projection welding device for the shell of the refrigeration compressor is improved on the basis of the embodiment 1: the inner side of the upper electrode seat 2 is provided with a longitudinal guide rail, and the outer side of the longitudinal guide rail is mutually overlapped with the outer side of the upper electrode in a sliding connection way.

The arrangement of the longitudinal guide rail limits the motion trail of the upper electrodes, so that each upper electrode is always kept in a vertical state in the process of applying pressure, the actual projection welding deviation of the device is reduced, and the welding quality of the device is improved.

Example 4

The combined projection welding device for the shell of the refrigeration compressor is improved on the basis of the embodiment 1: the clamping mechanism is arranged on the outer side of the bottom end of the upper electrode and is an elastic material component.

When taking a plurality of workpieces, the top end of the workpiece is abutted to the inner side of the bottom end of the upper electrode, and the elastic clamping mechanism can fix the position of the workpiece in the moving process of the workpiece, so that the next step of downward pressing projection welding operation is facilitated.

Example 5

The combined projection welding device for the shell of the refrigeration compressor is improved on the basis of the embodiment 1: the auxiliary positioning mechanism is arranged on the upper part of the outer side of the lower electrode holder 4, so that a workpiece can be lifted slightly to rotate in a small range, and the workpiece is prevented from being misplaced when being placed on the lower electrode holder 4.

Furthermore, set up the locating hole on the work piece, set up infra-red transmitter and infrared receiver in the corresponding position of upper electrode base 2 and lower electrode base 4, the infrared ray is fixed a position the completion promptly through the locating hole arrival receiver, when taking place the dislocation, the receiver can not receive the infrared ray, then starts auxiliary positioning mechanism or manual work and finely tune, further improves the projection welding precision.

Example 6

Based on the refrigeration compressor shell combined projection welding process and device in embodiment 1, the multi-station combined welding process and device are used for multi-station combined welding of the same machining surface, and can be directly applied to projection welding of products except the refrigeration compressor shell as long as the machining surfaces of all workpieces are the same in the operation range of the upper electrode holder 2.

And in the working range of the upper electrode holder 2, under the condition that the processing surface of each workpiece is not flat, the application can be realized by changing the action directions of the upper electrode and the pushing device, and the modification cost is low.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A combined projection welding process for a shell of a refrigeration compressor is characterized by comprising the following steps:

s1, processing a plurality of stations and a clamping structure on the surface of the upper cover component (3), and positioning the upper cover component (3) with the plurality of stations on the surface on the lower electrode holder (4);

s2, inserting a plurality of metal workpieces into corresponding stations at one time through the combined power head (1) or manually, and contacting the bottom ends of the workpieces with lower electrodes on the inner side of the lower electrode seat (4);

and S3, setting different downward pressures above the upper electrodes corresponding to different workpieces by the operation control device according to the processing requirements of the different workpieces, and simultaneously pressing the upper electrodes down by using the combined power piston to contact the top ends of the corresponding workpieces to form closed current so as to finish the one-time projection welding operation of the metal workpieces.

2. The refrigerant compressor shell combination projection welding process as set forth in claim 1, wherein in S2, the number of said metal workpieces is several, and the size, shape and material of several said metal workpieces are different from each other.

3. The refrigerant compressor housing combination projection welding process as set forth in claim 1, wherein in S1, a plurality of stations are different in size and depth, the stations including machining holes and placing grooves.

4. The refrigerant compressor shell combination projection welding process as set forth in claim 3, wherein in S2, the outside of the workpiece inserted into the machining hole is provided with a projecting ring, the outermost diameter of said projecting ring being larger than the diameter of the machining hole.

5. The combined convex welding device for the shell of the refrigeration compressor, which is designed for realizing the process of claim 1, comprises a combined power head (1) and a lower electrode holder (4), wherein the combined power head (1) is arranged right above the lower electrode holder (4), a component conveying device is arranged between the combined power head (1) and the lower electrode holder (4), a rotating mechanism is arranged on the outer side of the combined power head (1) or the outer side of the lower electrode holder (4), an upper electrode holder (2) is fixedly arranged at the bottom end of the combined power head (1), the combined power head is characterized in that a combined power piston (201) is arranged inside the combined power head (1), an upper electrode is detachably arranged on the inner side of the combined power piston (201), a clamping mechanism is arranged at the bottom end of the upper electrode, the outer side of the upper electrode penetrates through the bottom end of the combined power head (1) and the upper electrode holder (2) along the length of the outer side of the combined power head (1) and the upper electrode holder (2), and the upper electrode holder is detachably arranged on the inner side of the combined power head (201) The inboard activity of electrode holder (2) is cup jointed, the bulldozing device has been seted up on the top of combination formula power piston (201), the bottom electrode has been seted up to the inboard on bottom electrode holder (4) top, it is the same with the quantity of bulldozing device to go up electrode, bottom electrode and bottom electrode electric connection respectively have the power, go up the inboard of electrode holder (2) bottom and the top of bottom electrode holder (4) and set up the screens structure of mutual gomphosis, the screens structure includes inclined plane and recess, inclined plane and recess distribute in go up the inboard of electrode holder (2) bottom and the top of bottom electrode holder.

6. The combined projection welding device for the shell of the refrigeration compressor is characterized in that the upper electrodes comprise a first upper electrode (2011), a second upper electrode (2012) and a third upper electrode (2013), the lower electrodes comprise 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) are coincident with each other, the axes of the second upper electrode (2012) and the second lower electrode (402) are coincident with each other, and the axes of the third upper electrode (2013) and the third lower electrode (403) are coincident with each other.

7. The welding device of claim 5, wherein 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 with a control device.

8. The welding device of claim 5, wherein the pushing device comprises cylinder push rods or electric push rods with different specifications.

9. Combined projection welding device for shell of refrigeration compressor according to claim 5 characterized in that the inner side of the upper electrode holder (2) is provided with longitudinal guides, the outer side of which coincides with the sliding connection of the outer side of the upper electrode.

10. The welding device of claim 5, wherein the clamping mechanism is disposed outside the bottom end of the upper electrode, and the clamping mechanism is an elastic member.

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