CN218135551U

CN218135551U - Welding mould structure of electric welding device

Info

Publication number: CN218135551U
Application number: CN202222637014.7U
Authority: CN
Inventors: 胡理想
Original assignee: Shenzhen Hanyu Technology Co ltd
Current assignee: Shenzhen Hanyu Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-27
Anticipated expiration: 2032-09-30

Abstract

The utility model relates to an electric welding technical field, in particular to a welding mould structure of an electric welding device for resistance welding and/or hot pressure welding, which comprises a welding mould, wherein the welding mould comprises a welding head, a welding head clamp and a welding head which is fixedly connected with the welding head clamp through a welding head contact piece, so that the whole welding head is lower than the welding head clamp; the welding head air-blowing device is characterized by further comprising an air-cooling device provided with an air input hole, wherein the air-cooling device is provided with a welding head air-blowing hole communicated with the air input hole, and the welding head air-blowing hole faces the welding head. The utility model discloses the effect that reaches does, can prevent under the prerequisite of the same welding speed that the soldering head from taking away PCB pad etc. by the soldering tin on the welding, influences welding quality. The pressure during electric welding is easily ensured to be in an expected range, so that the welding pressure is controllable, the error of the thickness of a product can be prevented, and the welding effect is improved.

Description

Welding mould structure of electric welding device

Technical Field

The utility model relates to an electric welding technical field, in particular to welding die structure that is used for resistance welding and/or hot pressure welding's electric welding device.

Background

CN115106640A discloses a novel hot-press welding automation device, which comprises a power supply, a controller, a driving mechanism and a hot-press welding mechanism; the driving mechanism is connected with the hot-press welding mechanism and the controller and is used for driving the hot-press welding mechanism to move horizontally; the hot-press welding mechanism comprises a plurality of groups of mutually independent hot-press welding assemblies, each group of hot-press welding assemblies comprises a welding head, a pole rod, a plunger and a vertical driving piece which are sequentially connected, the hot-press welding assemblies further comprise a pressure sensor and a temperature sensor, the vertical driving pieces, the pressure sensor and the temperature sensor are electrically connected with the controller, and the power supply is electrically connected with the pole rod and the controller; the pressure sensor is used for sensing the pressure of the welding head for pressing down a bonding pad of an FPC and a stitch of a magnetic head, the temperature sensor is used for sensing the temperature of the welding head, and the vertical driving piece is used for driving the punch rod, the pole bar and the welding head to vertically move.

In summary, the prior art has at least the following technical problems,

firstly, the controller correspondingly adjusts the pressing stroke of the vertical driving piece and the punch according to the received pressure signal, and then adjusts the pressure of the welding head. The mode needs to precisely control the pressing stroke, is influenced by factors such as the performance of a controller, signal transmission delay and the like, and is not easy to control.

Second, in order to ensure production efficiency, the tact of welding tends to be fixed. However, in production practice, the solder on the object to be soldered, such as a PCB pad, is not cooled and is carried away by the soldering head, which affects the soldering quality.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve or alleviate the above-mentioned second technical problem.

The utility model adopts the means that the welding mould structure of the electric welding device comprises a welding mould, the welding mould comprises a welding head, a welding head clamp and a welding head contact element, and the welding head is fixedly connected with the welding head clamp through the welding head contact element, so that the whole welding head is lower than the welding head clamp; the welding head air-blowing device is characterized by further comprising an air-cooling device provided with an air input hole, wherein the air-cooling device is provided with a welding head air-blowing hole communicated with the air input hole, and the welding head air-blowing hole faces the welding head.

The utility model discloses the effect that reaches does, can prevent under the prerequisite of the same welding speed that the soldering head from taking away the soldering tin on the weldment such as PCB pad, influences welding quality.

The further technical scheme is that the welding machine further comprises a machine head assembly, a welding mould, a lifting device and an electric control device; the electric control device comprises a controller, and the welding mould is electrically connected with the controller; the lifting device is connected with the machine head assembly; the machine head assembly comprises a pressure spring, a machine head carrier, a pressure sensor electrically connected with the controller and a pressure transmission rod linearly and slidably connected with the machine head carrier, and the bottom end of the pressure transmission rod is fixedly connected with the welding head clamp; pressure sensor possesses sensor first end and sensor second end, sensor first end and pressure transmission pole fixed connection, and pressure spring one end is connected with the aircraft nose carrier, and the other end holds with the sensor second and offsets.

The pressure during electric welding is easily ensured to be in an expected range, so that the welding pressure is controllable, the error of the thickness of a product can be prevented, and the welding effect is improved.

According to the further technical scheme, a positioning outer edge is fixedly arranged on the side face of one end of the welding head clamp, a welding head contact element is attached to the inner wall of the positioning outer edge, and an installation lug is arranged at the bottom end of the welding head contact element; the welding head is fixedly connected with the mounting lug.

According to a further technical scheme, the welding device further comprises an electric control device, the electric control device comprises a controller and an air-cooling electromagnetic valve, the air input hole is communicated with the air-cooling electromagnetic valve, and the welding die is electrically connected with the controller.

Automatic air cooling can be achieved.

According to a further technical scheme, the air cooling device is further provided with a contact piece blowing hole communicated with the air input hole, and the outlet end of the contact piece blowing hole is attached to the welding head clamp.

The air in the air input hole can be enabled to be hotter, and the air input hole is prevented from blowing cooler air to the welding head to reduce the welding speed.

According to the further technical scheme, the welding head comprises a welding head contact part, and a welding head groove is formed above the welding head contact part; the gas inlet hole is directed toward the weld head groove.

The blowing of the blowing hole of the welding head can be prevented from directly acting on the contact part of the welding head to blow away the melted soldering tin at the contact part of the welding head.

According to the further technical scheme, the welding head clamp is provided with a connecting hole, and a shaft connecting sleeve attached to the welding head clamp is arranged in the connecting hole.

According to a further technical scheme, the air cooling device is a cuboid, the air input hole, the welding head blowing hole and the contact element blowing hole are all formed by drilling, and a plug is arranged at one end of the air input hole.

The production and the manufacture of the air cooling device are convenient.

According to a further technical scheme, the air cooling device is further provided with an air cooling mounting hole through a drilling process, and a screw is screwed into the air cooling mounting hole to enable the air cooling device to be detachably and fixedly connected with the welding head contact piece.

So as to be convenient for maintenance and replacement.

To sum up, the utility model discloses can reach following technological effect, can prevent under the prerequisite of the same welding speed that the soldering head from taking away PCB pad etc. by the soldering tin on the welding object, influence welding quality. The air in the air input hole can be enabled to be hotter, and the air input hole is prevented from blowing cooler air to the welding head to reduce the welding speed. The blowing of the blowing hole of the welding head can be prevented from directly acting on the contact part of the welding head to blow away the melted soldering tin at the contact part of the welding head.

Drawings

The first embodiment is illustrated in fig. 1 to 9; the second embodiment is illustrated in fig. 10 to 16.

Fig. 1 is a perspective view of an electric welding apparatus according to a first embodiment of the present invention.

Fig. 2 is a perspective view of an electric welding apparatus according to a first embodiment of the present invention.

Fig. 3 is a perspective view of the electric welding apparatus according to the first embodiment of the present invention; the cover 99 is not shown.

Fig. 4 is a perspective view of the head assembly 1, the lifting device 71, and the traverse device 72 according to the first embodiment of the present invention.

Fig. 5 is a schematic side view of the head assembly 1 and the lifting device 71 according to the first embodiment of the present invention.

Fig. 6 is a schematic top view of the head assembly 1 and the lifting device 71 according to the first embodiment of the present invention.

Fig. 7 is a schematic diagram of profile one SEC 1.

Fig. 8 is a schematic diagram of profile two SEC 2.

Fig. 9 is an electrical diagram of an electrical welding device according to a first embodiment of the present invention.

Fig. 10 is a schematic view of an electric welding apparatus according to a second embodiment of the present invention; the frame for fixing the lifting device 71 is not shown.

Fig. 11 is an exploded perspective view of head assembly 1, lifting device 71, welding mold 2, and air cooling device 3 according to a second embodiment of the present invention.

Fig. 12 is a perspective view of a welding mold 2 and an air cooling device 3 according to a second embodiment of the present invention.

Fig. 13 is a schematic perspective exploded view of a welding mold 2 and an air cooling device 3 according to a second embodiment of the present invention.

Fig. 14 is a perspective view of an air cooling device 3 according to a second embodiment of the present invention.

Fig. 15 is a schematic side view of a welding mold 2 and an air cooling device 3 according to a second embodiment of the present invention.

FIG. 16 is a schematic representation of a section three SEC3; arrow ARR1 represents the following.

Arrow one ARR1; section one SEC1; section two SEC2; section three SEC3; a head assembly 1; a pressure transmission rod 11; a transfer rod extension end 111; a pressure sensor 12; a sensor first end 121; a sensor second end 122; a connecting sleeve 123; a mounting sleeve 124; a suspension spring 125; an adjusting lever 13; a pressure spring 131; an indicator head 132; an adjustment knob 139; a handpiece carrier 19; a guide 191; a sensor cavity 192; a pressure regulation chamber 193; a compression amount display port 194; welding the mold 2; a welding head 21; a bonding tool contact 211; a solder head groove 212; a bonding head holder 22; positioning the outer rim 223; a shaft coupling sleeve 229; a horn contact 23; a mounting ear 231; an air cooling device 3; an air inlet hole 31; horn blow hole 32; contact blowing holes 33; air-cooled mounting holes 39; a moving device 7; a lifting device 71; a lifting end 711; a traverse device 72; a traversing end 721; a longitudinal movement device 73; an electric control device 8; a controller 81; a pressure transmitter 82; a temperature transmitter 83; a temperature sensor 831; a displacement sensor 84; an air-cooled solenoid valve 87; a phase-shift voltage regulator 88; a transformer 881; a power supply relay 882; an image pickup device 89; a display screen 891; a frame 9; a jig mounting frame 91; a floor stand 92; an operation region 929; an outer cover 99.

Detailed Description

The following description will explain embodiments of the present invention with reference to the accompanying drawings.

A first embodiment.

The electric welding apparatus of the first embodiment includes a head assembly 1, a welding mold 2, a moving device 7, and an electric control device 8.

The electric control device 8 comprises a controller 81, and the welding mold 2 is electrically connected with the controller 81. The controller 81 is a device for realizing electric control, such as a PLC, an industrial computer, or the like. For example, the electric control device 8 includes a phase-shifting voltage regulator 88, a transformer 881 and a power relay 882, the transformer 881 is electrically connected with the controller 81 through the phase-shifting voltage regulator 88, the phase-shifting voltage regulator 88 is electrically connected with the controller 81 through the power relay 882, the output end of the transformer 881 is electrically connected with the welding mold 2, and the controller 81 can control the transformer 881 to output electric energy to the welding mold 2 so as to raise the temperature of the welding mold 2. As a conventional technique, a temperature sensor 831 electrically connected to the controller 81 is disposed on the welding mold 2 to measure and control the temperature of the welding mold 2.

Moving means 7 comprises a lifting device 71 connected to handpiece assembly 1. For example, the lifting end 711 of the lifting device 71 is fixedly connected to the head assembly 1, so as to drive the head assembly 1 to lift. The lifting device 71 is an electric cylinder, and the lifting end 711 is plate-shaped. The lifting device 71 drives the screw rod to rotate through the servo motor so that the lifting end 711 is lifted. Of course, the lifting device 71 may be other devices capable of providing lifting power.

The moving device 7 further comprises a traverse device 72, and a lifting device 71 is fixed on a traverse end 721 of the traverse device 72, so that the head assembly 1 has lifting and traversing power.

The moving device 7 may further include a longitudinal moving device 73, and the lateral moving device 72 is fixed to the longitudinal moving device 73, so that the handpiece assembly 1 has XYZ three-axis power for lifting, lateral moving, and longitudinal moving. This embodiment is not an optimal embodiment, and the production efficiency and the volume above the floor table 92 are not optimal.

As a specific implementation manner, the electric welding device of the first embodiment further includes a frame 9, the frame 9 includes a jig mounting frame 91 and a floor platform 92, the moving device 7 includes a longitudinal moving device 73 disposed in the floor platform 92, the transverse moving device 72 is fixed on the floor platform 92, an output end of the longitudinal moving device 73 extends out of the floor platform 92 and is fixedly connected with the jig mounting frame 91, so that the jig mounting frame 91 has longitudinal moving power; the jig mounting bracket 91 faces the welding mold 2 in plan view. The jig mounting bracket 91 is used for fixing a jig (not shown in the drawings), and the jig is used for positioning and fixing a PCB pad and the like to be welded through the welding mold 2. Compared with the structure that the lifting device 71, the transverse moving device 72 and the longitudinal moving device 73 are connected with each other, the longitudinal moving device 73 is arranged in the floor platform 92, and the moving device 7 above the floor platform 92 occupies a small volume; longitudinal power, lifting and transverse moving can be carried out synchronously, and production efficiency can be improved. An outer cover 99 is fixedly arranged on the landing platform 92, the outer cover 99 surrounds the head assembly 1, the lifting device 71 and the transverse moving device 72 and is provided with an opening, one side of the landing platform 92 corresponding to the opening of the outer cover 99 is an operation area 929, and the operation area 929 is provided with a plurality of buttons and the like for realizing operation.

The handpiece assembly 1 comprises a pressure spring 131, a handpiece carrier 19, a pressure sensor 12 electrically connected with the controller 81 and a pressure transmission rod 11 linearly and slidably connected with the handpiece carrier 19, and the bottom end of the pressure transmission rod 11 is fixedly connected with the welding die 2. For example, a guide 191 having a linear bearing is fixedly disposed within handpiece assembly 1, and pressure-transmitting rod 11 is inserted into guide 191 to thereby linearly slidably couple handpiece assembly 1 to handpiece carrier 19.

The pressure sensor 12 includes a first sensor end 121 and a second sensor end 122, and the pressure sensor 12 detects a force between the first sensor end 121 and the second sensor end 122. The pressure sensor 12 may be a DYMH sensor, or other types and/or manufacturers of sensors having the above-described structure.

The first end 121 of the sensor is fixedly connected to the pressure transmission rod 11, for example, is screwed to the top end of the pressure transmission rod 11.

Pressure spring 131 is connected to handpiece carrier 19 at one end and against sensor second end 122 at the other end, and pressure spring 131 provides a repulsive force such that pressure sensor 12 and pressure transfer lever 11 have a tendency to move downward relative to handpiece carrier 19.

Electric control device 8 further includes a pressure transmitter 82, pressure sensor 12 is electrically connected to controller 81 through pressure transmitter 82, and handpiece assembly 1 is provided with a screen (not shown) electrically connected to controller 81 for displaying the reading of pressure sensor 12. The pressure value can be displayed in real time, facilitating the later-described adjustment of pressure.

The working principle is that before working, objects to be welded, such as PCB pads and the like, are positioned and fixed below the welding mould 2.

In operation, the lifting device 71 drives the handpiece assembly 1 to move downwards until the welding mold 2 contacts with a welded object such as a PCB pad, the lifting device 71 continues to move downwards, so that the pressure transmission rod 11 moves relative to the handpiece carrier 19, the pressure spring 131 is compressed, and the pressure between the pressure spring 131 and the pressure transmission rod 11 is measured by the pressure sensor 12. When the pressure value measured by the pressure sensor 12 reaches a preset value range (for example, preset and stored in the controller 81), the controller 81 controls power supply to the welding die 2 for welding.

It can be seen from the above that it is easier to ensure that the pressure during electric welding is within the expected range, so that the welding pressure is controllable, thereby preventing the error of the product thickness and improving the welding effect.

As one specific embodiment, handpiece assembly 1 further includes an indicator head 132 and an adjustment lever 13 hinged to handpiece carrier 19; the indicator 132 is linearly slidably connected to the handpiece carrier 19, the adjusting rod 13 is threadedly connected to the indicator 132, and both ends of the pressure spring 131 respectively abut against the indicator 132 and the second end 122 of the sensor. Rotating the adjustment lever 13 enables the indicator head 132 to slide linearly along the handpiece carrier 19, and thus enables the compression amount of the pressure spring 131 to be adjusted as needed. One end of the adjusting lever 13 is exposed from the handpiece carrier 19 and an adjusting knob 139 is fixedly connected to facilitate rotation of the adjusting lever 13. For example, the handpiece carrier 19 includes a pressure adjustment chamber 193, the pressure spring 131 is disposed in the pressure adjustment chamber 193, a compression amount display port 194 is formed in an outer wall of the pressure adjustment chamber 193, and the compression amount display port 194 faces the indicator head 132. The amount of compression of the pressure spring 131 can be read at the compression amount display port 194 by the indicating head 132.

As one specific embodiment, handpiece assembly 1 further includes a suspension spring 125; two ends of the suspension spring 125 respectively abut against the pressure sensor 12 and the handpiece carrier 19, the direction of the repulsive force provided by the suspension spring 125 is opposite to the direction of the repulsive force provided by the pressure spring 131, and the repulsive force provided by the suspension spring 125 is smaller than the repulsive force provided by the pressure spring 131. For example, handpiece assembly 1 further includes a mounting sleeve 124, pressure sensor 12 is fixed in mounting sleeve 124, and two ends of suspension spring 125 respectively abut against mounting sleeve 124 and the bottom wall of sensor cavity 192 of handpiece carrier 19, so as to mount pressure sensor 12. It is easy to understand that, when the compression connection of the suspension spring 125 is large in the initial state and provides a large repulsive force, the suspension spring 125 can suspend the pressure sensor 12, and the buffer of the pressure transmission rod 11 during movement can be realized.

In one specific embodiment, the pressure transmission rod 11 is fixedly provided with a transmission rod protruding end 111, one end of the transmission rod protruding end 111 is exposed from the handpiece carrier 19, the electronic control device 8 comprises a displacement sensor 84 electrically connected with the controller 81, and one end of the transmission rod protruding end 111 can trigger the displacement sensor 84 along with the movement of the pressure transmission rod 11 relative to the handpiece carrier 19. The displacement sensor 84 corresponds to the limit position of the movement of the pressure transmission rod 11 relative to the head carrier 19, and when the movement reaches or exceeds the limit position, the controller 81 controls the lifting device 71 to stop, so that the pressure of the welding mold 2 on the object to be welded such as a PCB pad due to misoperation and the like can be prevented from being excessively large.

A second embodiment.

The second embodiment differs from the first embodiment mainly in that the frame 9 and the moving means 7 are simplified.

The electric welding apparatus of the second embodiment includes a pressure transmission rod 11 having a lifting power, and a welding die 2 connected to the pressure transmission rod 11.

The welding mold 2 includes a welding head 21, a welding head holder 22, and a welding head contact element 23, and the welding head 21 is fixedly connected to the welding head holder 22 through the welding head contact element 23, so that the welding head 21 is lower than the welding head holder 22 as a whole. The horn contact 23 may be heated by its own short circuit, or by providing a heater or the like thereon.

The welding head clamp 22 is used for fixedly connecting with the pressure transmission rod 11, for example, the welding head clamp 22 is provided with a connecting hole (not shown in the figure), a joint shaft connecting sleeve 229 is arranged in the connecting hole, and the shaft connecting sleeve 229 has heat insulation. Such as ceramic, rubber, etc., or other thermally insulating material.

The electric welding apparatus of the second embodiment further includes an air cooling apparatus 3 provided with an air inlet hole 31, the air cooling apparatus 3 is provided with a horn blow hole 32 communicating with the air inlet hole 31, and the horn blow hole 32 faces the horn 21. After the object to be welded, such as a PCB pad, is welded (generally, after the pressure reaches a set range, the object is heated by electricity, and after the pressure is heated by electricity for a set time), the air inlet hole 31 is vented to allow air to be blown out from the welding head air blowing hole 32 to form air blow, so as to cool the welding head 21 (but not the lower the cooling end temperature is, the better, the lower the cooling temperature is, the welding speed is reduced), and on the premise of the same welding speed, the welding head 21 can be prevented from taking away soldering tin on the object to be welded, such as a PCB pad, and the welding quality is not affected. The air input hole 31 is a through hole, one end of which is communicated with the air pipe, and the other end of which is sealed by a plug. A positioning outer edge 223 is fixedly arranged on the side face of one end of the welding head clamp 22, the welding head contact element 23 is attached to the inner wall of the positioning outer edge 223, and a mounting lug 231 is arranged at the bottom end of the welding head contact element 23; the welding head 21 is fixedly connected to the mounting lug 231.

As a specific embodiment, the welding apparatus further includes an electric control device 8, the electric control device 8 includes a controller 81 and an air-cooling solenoid valve 87, the air inlet 31 is communicated with the air-cooling solenoid valve 87, and the welding mold 2 is electrically connected to the controller 81. Such as through the aforementioned phase shift voltage regulator 88, transformer 881, and power relay 882. Automatic air cooling can be achieved.

In a specific embodiment, the air cooling device 3 is further provided with a contact blow hole 33 communicating with the air input hole 31, and an outlet end of the contact blow hole 33 is attached to the solder head holder 22. The air in the air inlet hole 31 can be made hotter, and the air inlet hole 31 is prevented from blowing cooler air toward the horn 21 to reduce the welding speed.

As a specific embodiment, the welding head 21 includes a welding head contact portion 211, and a welding head groove 212 is formed above the welding head contact portion 211; the gas inlet hole 31 faces the horn slot 212. It is possible to prevent the blow air from the horn blow hole 32 from directly acting on the horn contact portion 211 to blow away the melted solder in the horn contact portion 211.

In a specific embodiment, the air cooling device 3 is a rectangular parallelepiped, the air inlet hole 31, the horn blowing hole 32, and the contact blowing hole 33 are all formed by drilling, and a plug (not shown in the drawings) is provided at one end of the air inlet hole 31. The production and manufacture of the air cooling device 3 are facilitated. The air cooling device 3 is further provided with an air cooling mounting hole 39 through a drilling process, and a screw (not shown in the drawing) is screwed into the air cooling mounting hole 39 so that the air cooling device 3 is detachably and fixedly connected with the welding head contact piece 23; so as to be convenient for maintenance and replacement.

As used in the present invention, the term: first, second, etc. do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

As in the present invention the term is used: one, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

Claims

1. The welding mould structure of the electric welding device comprises a welding mould (2), wherein the welding mould (2) comprises a welding head (21), a welding head clamp (22) and a welding head contact element (23), and the welding head (21) is fixedly connected with the welding head clamp (22) through the welding head contact element (23), so that the whole welding head (21) is lower than the welding head clamp (22);

the welding head air-blowing device is characterized by further comprising an air-cooling device (3) provided with an air input hole (31), wherein the air-cooling device (3) is provided with a welding head air-blowing hole (32) communicated with the air input hole (31), and the welding head air-blowing hole (32) faces the welding head (21).

2. The welding die structure of an electric welding device according to claim 1, further comprising a head assembly (1), a welding die (2), a lifting device (71), and an electric control device (8); the electric control device (8) comprises a controller (81), and the welding die (2) is electrically connected with the controller (81); the lifting device (71) is connected with the machine head assembly (1); the head assembly (1) comprises a pressure spring (131), a head carrier (19), a pressure sensor (12) electrically connected with the controller (81) and a pressure transmission rod (11) linearly and slidably connected with the head carrier (19), and the bottom end of the pressure transmission rod (11) is fixedly connected with the welding head clamp (22); the pressure sensor (12) is provided with a first sensor end (121) and a second sensor end (122), the first sensor end (121) is fixedly connected with the pressure transmission rod (11), one end of the pressure spring (131) is connected with the handpiece carrier (19), and the other end of the pressure spring is abutted against the second sensor end (122).

3. The welding mold structure of an electric welding device according to claim 1, wherein a positioning outer rim (223) is fixedly provided on a side surface of one end of the welding head holder (22), the welding head contact member (23) is attached to an inner wall of the positioning outer rim (223), and a mounting lug (231) is provided at a bottom end of the welding head contact member (23); the welding head (21) is fixedly connected with the mounting lug (231).

4. The welding die structure of an electric welding device according to claim 2, wherein the electric control device (8) comprises a controller (81) and an air-cooled solenoid valve (87), the air inlet hole (31) is communicated with the air-cooled solenoid valve (87), and the welding die (2) is electrically connected with the controller (81).

5. The welding die structure of the electric welding device according to claim 1, wherein the air cooling device (3) is further provided with a contact piece blow hole (33) communicating with the air input hole (31), and an outlet end of the contact piece blow hole (33) is attached to the tip holder (22).

6. The welding die structure of the electric welding device according to claim 4, wherein the welding head (21) includes a welding head contact portion (211), and a welding head groove (212) is formed above the welding head contact portion (211); the gas inlet hole (31) faces the weld head groove (212).

7. Welding mould structure of an electric welding device according to any of the claims 1-6, characterized in that the welding head holder (22) is provided with a connection hole in which a joint shaft connection sleeve (229) is arranged.

8. The welding mold structure of the electric welding device according to any one of claims 1 to 6, wherein the air cooling device (3) is a rectangular parallelepiped, the air inlet hole (31), the welding head blowing hole (32), and the contact blowing hole (33) are all formed by drilling, and a plug is provided at one end of the air inlet hole (31).

9. The welding mold structure of an electric welding device according to claim 8, wherein the air-cooling device (3) is further provided with an air-cooling mounting hole (39) by a drilling process, and a screw is screwed into the air-cooling mounting hole (39) so that the air-cooling device (3) is detachably and fixedly connected to the welding head contact member (23).