CN218135635U

CN218135635U - Electric welding device

Info

Publication number: CN218135635U
Application number: CN202222623855.2U
Authority: CN
Inventors: 胡祥鑫
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 the technical field of electric welding, in particular to an electric welding device for resistance welding and/or hot pressure welding, which comprises a machine head component, a welding mould, a moving device and an electric control device; the electric control device comprises a controller, and the welding mould is electrically connected with the controller; the moving device comprises a lifting device 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 mould; 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 utility model discloses the effect that reaches does, pressure when ensureing electric welding more easily is at anticipated within range for welding pressure is controllable, thereby can prevent the error of product thickness, improves the welding effect.

Description

Electric welding device

Technical Field

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

Background

CN115106640A discloses a novel automatic hot-press welding 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 electrically connected with the controller and is used for driving the hot-press welding mechanism to horizontally move; 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, so that the soldering quality is affected.

SUMMERY OF THE UTILITY MODEL

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

The utility model adopts the means that the electric welding device comprises a machine head component, a welding mould moving device and an electric control device; the electric control device comprises a controller, and the welding mould is electrically connected with the controller; the moving device comprises a lifting device 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 mould; pressure sensor possesses the first end of sensor and sensor second end, the first end of sensor 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 utility model discloses the effect that reaches does, pressure when ensureing electric welding more easily is at anticipated within range for welding pressure is controllable, thereby can prevent the error of product thickness, improves the welding effect.

Further technical scheme still includes the frame, and the frame includes tool mounting bracket and the platform that falls to the ground, and the mobile device is including setting up the device that moves that indulges in the platform that falls to the ground, and the sideslip device is fixed at the bench that falls to the ground, and the output that moves the device that indulges stretches out the platform that falls to the ground and tool mounting bracket fixed connection, and the tool mounting bracket is just to welding mould when overlooking.

The mobile device above the floor platform occupies smaller volume; longitudinal power, lifting and transverse moving can be carried out synchronously, and production efficiency can be improved.

According to a further technical scheme, the electric control device further comprises a pressure transmitter, the pressure sensor is electrically connected with the controller through the pressure transmitter, and the head assembly is provided with a screen which is electrically connected with the controller and used for displaying the reading of the pressure sensor.

The pressure value can be displayed in real time, facilitating the later-described adjustment of pressure.

According to a further technical scheme, the electric control device comprises a phase-shifting voltage regulator, a transformer and a power supply relay, the transformer is electrically connected with the controller through the phase-shifting voltage regulator, the phase-shifting voltage regulator is electrically connected with the controller through the power supply relay, and the output end of the transformer is electrically connected with the welding mold.

According to a further technical scheme, the machine head assembly further comprises an indicating head and an adjusting rod hinged with the machine head carrier; the indicating head is in linear sliding connection with the handpiece carrier, the adjusting rod is in internal thread connection with the indicating head, and two ends of the pressure spring are respectively abutted against the indicating head and the second end of the sensor.

The compression amount of the pressure spring can be adjusted as required.

According to the technical scheme, the machine head carrier comprises a pressure adjusting cavity, the pressure spring is arranged in the pressure adjusting cavity, the outer wall of the pressure adjusting cavity is provided with a compression amount display port, and the compression amount display port is right opposite to the indicating head.

The amount of compression of the pressure spring can be read at the compression amount display port by the indicating head.

According to a further technical scheme, the nose assembly further comprises a suspension spring; two ends of the suspension spring are respectively abutted against the pressure sensor and the handpiece carrier, the direction of a repulsive force provided by the suspension spring is opposite to the direction of a repulsive force provided by the pressure spring, and the repulsive force provided by the suspension spring is smaller than the repulsive force provided by the pressure spring.

The pressure sensor can be suspended by the suspension spring, and the buffer of the pressure transmission rod during movement can be realized.

According to a further technical scheme, the machine head assembly further comprises an installation sleeve, the pressure sensor is fixed in the installation sleeve, and two ends of the suspension spring are respectively abutted to the bottom wall of the sensor cavity of the installation sleeve and the bottom wall of the machine head carrier.

To facilitate the mounting of the pressure sensor.

According to the technical scheme, the pressure transmission rod is fixedly provided with a transmission rod extending end, one end of the transmission rod extending end is exposed out of the handpiece carrier, the electric control device comprises a displacement sensor electrically connected with the controller, and one end of the extending end of the transmission rod can move relative to the handpiece carrier along with the pressure transmission rod to trigger the displacement sensor.

The pressure of the welding mould on the object to be welded such as a PCB pad and the like can be prevented from being overlarge due to misoperation and the like.

To sum up, the utility model discloses can reach following technological effect, pressure when ensureing electric welding relatively easily is at anticipated within range, ensures electric welding quality. The pressure sensor can be suspended by the suspension spring, and the buffer of the pressure transmission rod during movement can be realized. The pressure of the welding mould on the object to be welded such as a PCB pad and the like can be prevented from being overlarge due to misoperation and the like.

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 schematic perspective view of an electric welding apparatus according to a 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 head assembly 1 and lifting device 71 according to the first embodiment of the present invention.

Fig. 6 is a schematic top view of head assembly 1 and 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 apparatus 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 flying 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 weld 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 holes 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; a housing 99.

Detailed Description

The following description will explain embodiments of the present invention with reference to the 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 prior art, the welding mold 2 is provided with a temperature sensor 831 electrically connected to the controller 81 for measuring and controlling 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 the lifting device 71 is fixed on a traverse end 721 of the traverse device 72, so that the handpiece 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 on the longitudinal moving device 73, so that the handpiece assembly 1 has XYZ three-axis power of 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, and 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 frame 91 faces the welding mold 2 in plan view. The jig mounting frame 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 by 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 machine head assembly 1, the lifting device 71 and the transverse moving device 72, one surface of the outer cover 99 is open, an operation area 929 is arranged on one side of the landing platform 92 corresponding to the opening of the outer cover 99, 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 sensor first end 121 and a sensor second end 122, and the pressure sensor 12 detects a force between the sensor first end 121 and the sensor second end 122. The pressure sensor 12 may be an ocean brand DYMH sensor, or may be a sensor of the above-described configuration of another model and/or manufacturer.

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

Electronic control unit 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, and the later-described adjustment pressure is facilitated.

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 workpiece 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 (such as preset and stored in the controller 81), the controller 81 controls the 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, which in turn enables the compression of the pressure spring 131 to be adjusted as required. One end of the adjustment lever 13 is exposed from the handpiece carrier 19 and an adjustment knob 139 is fixedly attached to facilitate rotation of the adjustment 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, and 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 flying 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 embodiment, the pressure transmission rod 11 is fixedly provided with a transmission rod extending end 111, one end of the transmission rod extending end 111 is exposed from the handpiece carrier 19, the electric control device 8 includes a displacement sensor 84 electrically connected to the controller 81, and one end of the transmission rod extending end 111 can trigger the displacement sensor 84 as the pressure transmission rod 11 moves relative to the handpiece carrier 19. The displacement sensor 84 corresponds to the limit position of the movement of the pressure transmission lever 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, thereby preventing an excessive pressure from being applied to the object to be soldered, such as a PCB pad, by the soldering mold 2 due to an erroneous operation or the like.

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 comprises a welding head 21, a welding head holder 22, and the welding head 21 is fixedly connected with the welding head holder 22 through a 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 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 device 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 hole 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 shifting 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 one specific embodiment, the bonding tool 21 includes a bonding tool contact portion 211, and a bonding tool groove 212 is opened above the bonding tool 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 off the molten solder of 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 in the present invention the term is used: first, second, etc. do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

As used in the present invention, the term: 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 electric welding device comprises a machine head assembly (1), a welding mould (2), a moving device (7) and an electric control device (8); the electric control device (8) comprises a controller (81), and the welding mould (2) is electrically connected with the controller (81); the moving device (7) comprises a lifting device (71) connected with the handpiece component (1);

the welding head component is characterized in that the head component (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 die (2); 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).

2. The electric welding device according to claim 1, further comprising a frame (9), wherein the frame (9) comprises a jig mounting frame (91) and a floor table (92), the moving device (7) comprises a longitudinal moving device (73) arranged in the floor table (92), the transverse moving device (72) is fixed on the floor table (92), an output end of the longitudinal moving device (73) extends out of the floor table (92) and is fixedly connected with the jig mounting frame (91), and the jig mounting frame (91) faces the welding mold (2) in a plan view.

3. Electrical welding device according to claim 1, wherein the electrical control device (8) further comprises a pressure transducer (82), the pressure sensor (12) being electrically connected to the controller (81) via the pressure transducer (82), the head assembly (1) being provided with a screen for displaying the reading of the pressure sensor (12) which is electrically connected to the controller (81).

4. The electric welding device according to claim 1, characterized in that the electric control device (8) comprises a phase-shifting voltage regulator (88), a transformer (881) and a power relay (882), the transformer (881) is electrically connected to the controller (81) through the phase-shifting voltage regulator (88), the phase-shifting voltage regulator (88) is electrically connected to the controller (81) through the power relay (882), and the output of the transformer (881) is electrically connected to the welding mold (2).

5. Electrical welding device according to claim 1, characterized in that the head assembly (1) further comprises an indicator head (132) and an adjusting lever (13) articulated to the head carrier (19); the indicating head (132) is in linear sliding connection with the handpiece carrier (19), the adjusting rod (13) is in internal thread connection with the indicating head (132), and two ends of the pressure spring (131) are respectively abutted against the indicating head (132) and the second end (122) of the sensor.

6. The electric welding device according to claim 5, wherein the head carrier (19) includes a pressure adjusting chamber (193), the pressure spring (131) is disposed in the pressure adjusting chamber (193), a compression amount display port (194) is formed in an outer wall of the pressure adjusting chamber (193), and the compression amount display port (194) is opposed to the indicating head (132).

7. The electrical welding device of claim 1, wherein the head assembly (1) further comprises a flying spring (125); two ends of the suspension spring (125) are respectively propped against the pressure sensor (12) and the handpiece carrier (19), the direction of a repulsive force provided by the suspension spring (125) is opposite to the direction of a 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).

8. The electrical welding device according to claim 7, characterized in that the head assembly (1) further comprises a mounting sleeve (124), the pressure sensor (12) is fixed in the mounting sleeve (124), and both ends of the suspension spring (125) are respectively abutted against the mounting sleeve (124) and the bottom wall of the sensor cavity (192) of the head carrier (19).

9. An electric welding device according to claim 1, characterized in that 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 electric control device (8) comprises a displacement sensor (84) electrically connected to the controller (81), one end of the transmission rod protruding end (111) is capable of triggering the displacement sensor (84) as the pressure transmission rod (11) moves relative to the handpiece carrier (19).