CN112548285B

CN112548285B - Electric welding device

Info

Publication number: CN112548285B
Application number: CN202011371561.4A
Authority: CN
Inventors: 苏朝辉; 王丽; 张文悦; 刘敏峰
Original assignee: Shandong Huayu University of Technology
Current assignee: Shandong Huayu University of Technology
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-05-24
Anticipated expiration: 2040-11-30
Also published as: CN112548285A

Abstract

The invention relates to the technical field of welding fixtures, in particular to an electric welding device. This electric welding device includes: the clamping assembly comprises a mounting seat, a plurality of clamping bodies and a rotating body, and the mounting seat is provided with an axially-penetrating through hole; the mounting seat is also provided with a plurality of inclined moving channels, and the plurality of clamping bodies penetrate through the corresponding inclined moving channels and do reciprocating movement along the extending direction of the inclined moving channels; one side that the cramping body is in opposite directions is provided with the clamping face, and one side that a plurality of cramping bodies dorsad is provided with first screw thread portion, is provided with second screw thread portion in the rotor, and when the rotor rotated around self axis, a plurality of cramping bodies moved along slant migration channel in opposite directions or dorsad. In the embodiment of the invention, the welding rod is arranged among the plurality of clamping bodies, and the plurality of clamping bodies are driven to move along the oblique moving channel by rotating the rotating body, so that automatic centering and clamping are realized, the welding rod is prevented from being skewed during welding, the welding quality is ensured, and the working efficiency is improved.

Description

Electric welding device

Technical Field

The invention relates to the technical field of welding fixtures, in particular to an electric welding device.

Background

The electric welding device is used for clamping the welding rod to carry out electrode arc welding, is used for clamping the welding rod, is an instrument for conducting welding current during welding, is matched with an electric arc welding machine to be used, and is a handheld insulating appliance used for clamping and controlling the welding rod and ensuring the electrical connection with the welding rod during manual arc welding.

Conventional welding devices are typically electrode holders, which are tools used in welding and have two handles shaped like pliers. The electrode holders have the main technical indexes of shell protection, electric shock protection, temperature rise value, welding spatter resistance, falling resistance and the like. However, when the conventional electrode holder is used for manual arc welding, the welding rod is often skewed due to high-temperature deformation of the spring and the like, so that the welding quality is affected, inconvenience is brought to an operator, and the production efficiency is reduced.

Therefore, there is a need for an electric welding apparatus that facilitates clamping of the electrode.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides the electric welding device, the welding rod is arranged among a plurality of clamping bodies, the rotating rotor drives the plurality of clamping bodies to move along the oblique moving channel under the action of the cooperation of the rotating rotor and the spiral principle, and the technical problem of the skew clamping of the welding rod in the prior art is solved.

In order to achieve the above technical object, an embodiment of the present invention provides an electric welding device, including a sleeve body and a clamping assembly connected to the sleeve body, wherein: the clamping assembly comprises an installation seat, a plurality of clamping bodies and a rotating body, and a through hole which penetrates through the installation seat in the axial direction is formed in the installation seat; the mounting seat is also provided with a plurality of inclined moving channels which correspond to the clamping bodies one by one and extend to the outer end face of the mounting seat, and the clamping bodies penetrate through the corresponding inclined moving channels and can reciprocate along the extending direction of the inclined moving channels; a clamping surface for clamping a workpiece is arranged on one opposite side of the clamping bodies, a first threaded part is arranged on one opposite side of the clamping bodies, a second threaded part matched with the first threaded part is arranged in the rotating body, the rotating body and the mounting seat are coaxially arranged, and when the rotating body rotates around the axis of the rotating body, the clamping bodies move in opposite directions or in opposite directions along the oblique moving channel;

the mounting seat comprises a first seat body, a second seat body and a third seat body which are sequentially connected, the second seat body is conical, the diameter of the joint of the second seat body and the first seat body is smaller than that of the joint of the second seat body and the third seat body, and the first thread part protrudes out of the outer wall surface of the second seat body; the rotating body is sleeved on the second seat body, and a second thread part of the rotating body is a conical thread;

the inclined moving channel inclines towards the inside of the through hole, and the inclination angle of the inclined moving channel and the central axis of the through hole is 10-15 degrees.

Furthermore, the electric welding device further comprises a bridging device and a connecting body, wherein the bridging device comprises a thin-wall sleeve, the thin-wall sleeve is sleeved on the clamping assembly, the first end of the connecting body is in threaded connection with the sleeve body, and the second end of the connecting body is in rotatable connection with the bridging device.

Further, the clamping assembly further comprises a shell, the shell is in interference connection with the rotating body, and the thin-wall sleeve is sleeved on the shell and locked through a first fastener.

Furthermore, the first fastening piece is a fastening screw, and a threaded hole which extends along the radial direction of the thin-wall sleeve and is matched with the fastening screw is formed in the thin-wall sleeve.

Further, be provided with the earrings on the connector, bridging device still include with earring seat that the thin wall cover is connected, earring seat is including two auricles of relative setting, the earrings set up in two between the auricle and connect through the second fastener.

Furthermore, a first connecting hole is formed in the ear ring, a second connecting hole matched with the first connecting hole is formed in the ear piece, and the second fastener comprises a bolt penetrating through the first connecting hole and the second connecting hole and a butterfly nut in threaded connection with the bolt.

Further, the electric welding device also comprises a connecting rod connected to the first end of the connecting body, and the diameter of the connecting rod is smaller than that of the sleeve body; the first end of the connecting rod is in threaded connection with the first end of the connecting body, the second end of the connecting rod is provided with a wire inlet used for penetrating through a welding wire, and the connecting rod is locked through a third fastener.

Further, the sleeve body comprises a first sleeve and a second sleeve which are connected with each other, the first sleeve and the second sleeve are in threaded connection, the length of the first sleeve is smaller than that of the connecting rod from the first end to the third fastener, and the length of the sleeve body is slightly larger than that of the connecting rod.

Further, the connecting rod, the connecting body, the clamping assembly and the bridging device are all made of conductive materials.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

1. in the embodiment of the invention, the welding rod is arranged among the clamping bodies, the clamping bodies are driven to move along the oblique moving channel under the action of the rotating body matched with the spiral principle, so that automatic centering and clamping are realized, and compared with the traditional spring and the pressing handle, the welding rod deflection condition in the conventional manual arc welding process is effectively prevented, the welding quality is ensured, and the working efficiency is improved.

2. In the embodiment of the invention, the traditional clamp type pressing handle of the electric welding device is changed into a smooth linear type, the holding part of an operator is prolonged, the electric welding device is suitable for various narrow or internal welding scenes, and the application range of the electric welding device is relatively enlarged.

3. In the embodiment of the invention, the bridging device is rotatably connected with the connecting body, so that the angle between the clamping bridging device and the connecting body can be adjusted as required, namely, the clamping angle is adjusted, and the welding device is suitable for the requirements of electric welding in various occasions; the welding device can meet various welding modes and is convenient to disassemble and assemble.

4. In the embodiment of the invention, the first end, namely the top end, of the connecting rod is fixedly connected with the connecting body through threads, and the second end, namely the bottom end, of the connecting rod is prefabricated with the wire inlet and is compressed by the compression screw, so that the connecting rod is safe, convenient and quick.

5. In the embodiment of the invention, the first sleeve and the second sleeve are connected by the internal thread and the external thread, so that the first sleeve and the second sleeve can be effectively insulated and play a role in protection. First telescopic first end is for prefabricated hexagon in advance, and is convenient during the installation, if make things convenient for the centre gripping when using spanner pliers.

Drawings

FIG. 1 is a schematic perspective view of an electric welding apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a clamping assembly according to an embodiment of the present invention;

FIG. 3 is a front view of a clamping assembly in an embodiment of the invention;

FIG. 4 is a sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic diagram of a connection structure of a bridging device and a connecting body according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a bridge device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a connector according to an embodiment of the present invention;

FIG. 8 is a schematic view showing a coupling structure of a coupling body and a coupling rod according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a connecting rod in an embodiment of the present invention;

FIG. 10 is a schematic view of a first sleeve according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a second sleeve according to an embodiment of the present invention.

Description of the reference numerals

10-sleeve body, 101-first sleeve, 102-second sleeve, 103-first internal thread, 104-second internal thread, 105-first external thread;

20-clamping component, 201-mounting seat, 2011-through hole, 2012-first seat, 2013-second seat, 2014-third seat, 2015-oblique moving channel, 202-clamping body, 2021-first threaded part, 203-rotating body, 2031-second threaded part, 204-shell;

30-bridging means, 301-thin wall sleeve, 302-lug, 3021-second connection hole, 303-fastening screw, 304-bolt, 305-butterfly nut, 306-protrusion;

40-connector, 401-earring, 4011-first connection hole, 402-transition, 403-connection, 404-second external thread, 405-third internal thread;

50-connecting rod, 501-wire inlet, 502-third external thread, 503-square, 504-compression screw and 505-jackscrew hole.

Detailed Description

Other objects and advantages of the present invention will become apparent by the following explanation of preferred embodiments of the present invention.

Fig. 1-11 show schematic structural diagrams of an electric welding device according to the present invention. For convenience of description, the terms "upper", "lower", "left" and "right" are used in the same direction as the upper, lower, left and right directions of the drawings, but do not limit the structure of the present invention.

As shown in fig. 1 to 11, an electric welding apparatus includes a sleeve body 10 and a clamping assembly 20 connected to the sleeve body 10, wherein: the clamping assembly 20 comprises a mounting seat 201, a plurality of clamping bodies 202 and a rotating body 203, wherein a through hole 2011 which axially penetrates through is formed in the mounting seat 201; the installation base 201 is further provided with a plurality of inclined moving channels 2015 which are in one-to-one correspondence with the clamping bodies 202 and extend to the outer end surface of the installation base 201, and the plurality of clamping bodies 202 penetrate through the inclined moving channels 2015 and can reciprocate along the extending direction of the inclined moving channels 2015; the opposite sides of the clamping bodies 202 are provided with clamping surfaces for clamping workpieces, the opposite sides of the clamping bodies 202 are provided with first thread parts 2021, second thread parts 2031 matched with the first thread parts 2021 are arranged in the rotating body 203, the rotating body 203 and the mounting base 201 are coaxially arranged, and when the rotating body 203 rotates around the axis of the rotating body 203, the clamping bodies 202 move towards or away from each other along the moving channel. Specifically, the through-hole 2011 provides a passage for installation of the welding rod. Slant removal passageway 2015 is towards the inside slope of through-hole 2011, and its inclination with the axis of through-hole 2011 is 10-15, avoids the angle undersize to influence the welding rod installation, and the angle is too big to lead to slant removal passageway 2015 overlength. The clamping face on the clamping body 202 is roughly an inclined arc, and the arc inclined direction of the clamping face is matched with the moving direction of the clamping body 202, so that the welding rod is conveniently clamped and the damage to the welding rod is avoided. When the rotating body 203 rotates, the first thread portion 2021 and the second thread portion 2031 are engaged with each other, the rotating body 203 does not move axially, the plurality of clamping bodies 202 are driven to move along the oblique moving channel 2015, one end portions of the plurality of clamping bodies 202 are close to each other, and the welding rods are clamped by the engaging clamping surfaces to perform electric welding operation.

In the embodiment of the invention, the welding rod is arranged among the clamping bodies 202, the clamping bodies 202 are driven to move along the oblique moving channel 2015 under the action of the rotary rotating body 203 matched with the spiral principle, so that automatic centering and clamping are realized, and compared with the traditional spring and pressing handle, the situation that the welding rod is inclined during welding in the conventional manual arc welding is effectively prevented, the welding quality is ensured, and the working efficiency is improved. In the embodiment of the invention, the traditional clamp type pressing handle of the electric welding device is changed into a smooth linear type, the holding part of an operator is prolonged, the electric welding device is suitable for various narrow or internal welding scenes, and the application range of the electric welding device is relatively enlarged.

In some embodiments, as shown in fig. 2-4, the mounting base 201 includes a first base 2012, a second base 2013 and a third base 2014 connected in sequence, the second base 2013 is tapered, a diameter of a connection portion between the second base 2013 and the first base 2012 is smaller than a diameter of a connection portion between the second base 2013 and the third base 2014, and the first threaded portions 2021 of the plurality of clamping bodies 202 protrude from an outer wall surface of the second base 2013; the rotating body 203 is sleeved on the second seat 2013 and the second thread portion 2031 of the rotating body 203 is a tapered thread. The rotor 203 may include two half rings with identical structures, which are easily installed on the second housing 2013. The rotor 203 is mounted such that its outer wall surface is flush with the outer wall surface of the third seat 2014 having the largest diameter. By the shape fit of the rotating body 203 and the second seat 2013, the rotating body 203 drives the plurality of clamping bodies 202 to move axially when rotating and enables the end portions of the plurality of clamping bodies 202 to be clamped in a self-centering manner.

In some embodiments, as shown in fig. 1, 5-7, the electric welding apparatus further includes a bridging device 30 and a connecting body 40, the bridging device 30 includes a thin-walled sleeve 301, the thin-walled sleeve 301 is disposed on the clamping assembly 20, a first end of the connecting body 40 is screwed to the sleeve body 10, and a second end of the connecting body 40 is rotatably connected to the bridging device 30. The clamping assembly 20 is arranged in the thin-wall sleeve 301 on the bridging device 30, and the bridging device 30 is rotatably connected with the connecting body 40, so that the angle between the bridging device 30 and the connecting body 40 can be adjusted as required, namely, the clamping angle is adjusted, and the welding device is suitable for the requirements of electric welding on various occasions. The connecting body 40 is connected with the sleeve body 10 by screw threads, so that the connecting body is convenient to mount and dismount.

In some embodiments, as shown in fig. 1-4, the clamping assembly 20 further includes a housing 204, the housing 204 is in interference fit with the rotor 203, and the thin-walled sleeve 301 is disposed on the housing 204 and locked by the first fastening member. The thin-wall sleeve 301 is internally provided with a cylindrical hole matched with the shape of the shell 204, the shell 204 is in interference connection with the third seat 2014, and the outer wall surface of the rotating body 203, which is the largest in diameter of the third seat 2014, is flush with the outer wall surface, so that the second seat 2013, the third seat 2014 and the rotating body 203 are just accommodated in the shell 204 after the shell 204 is installed, and the protection and connection effects are achieved.

In some embodiments, as shown in fig. 6, the first fastening member is a fastening screw 303, and the thin-walled sleeve 301 is provided with a threaded hole extending along a radial direction of the thin-walled sleeve 301 and matching with the fastening screw 303. One side of the thin-wall sleeve 301, which faces away from the earring seat, may be provided with a protrusion 306, which plays a guiding role in screwing the fastening screw 303, and at the same time, limits the fastening position of the fastening screw 303, that is, the head of the fastening screw 303 abuts against the outer end face of the protrusion 306, thereby achieving locking. By loosening the fastening screw 303, the clamping assembly 20 can be accommodated in the thin-wall sleeve 301, and the fastening screw 303 is tightened so that the end of the fastening screw 303 abuts against the outer wall surface of the housing 204, thereby completing the installation.

In some embodiments, as shown in fig. 5-7, the connecting body 40 is provided with an ear ring 401, and the bridging device 30 further comprises an ear ring seat connected to the thin-walled sleeve 301, the ear ring seat comprises two oppositely-arranged ear plates 302, and the ear ring 401 is arranged between the two ear plates 302 and connected by a second fastener.

In some embodiments, as shown in fig. 6 and 7, the ear ring 401 is provided with a first connection hole 4011, the ear piece 302 is provided with a second connection hole 3021 matching with the first connection hole 4011, and the second fastener comprises a bolt 304 passing through the first connection hole 4011 and the second connection hole 3021 and a wing nut 305 threaded on the bolt 304. Specifically, the second connection holes 3021 of the two tabs 302 are oppositely communicated, the first connection hole 4011 of the connection body 40 is communicated with the second connection hole 3021, the end of the bolt 304 sequentially passes through the second connection hole 3021 of one tab 302, the first connection hole 4011 and the second connection hole 3021 of the other tab 302, and the butterfly nut 305 is screwed to complete the installation. When the angle needs to be adjusted, the wing nut 305 can be loosened to freely rotate the angle to the required angle, and the wing nut 305 is screwed. Connecting body 40 includes transition portion 402 and connecting portion 403, and one end of transition portion 402 is fixedly connected with earring 401, and the other end is fixedly connected with connecting portion 403. The transition portion 402 is hexagonal and is convenient to mount, such as to clamp when using a wrench or pliers. The connecting body 40 may be integrally formed to enhance the stability of the connection. The bridging device 30 is connected with the connecting body 40 through the bolt 304 and fixed through the butterfly nut 305, so that the requirements of various welding modes can be met, and meanwhile, the assembly and disassembly are facilitated.

In some embodiments, as shown in fig. 5, 8 and 9, the electric welding device further comprises a connecting rod 50 connected to the first end of the connecting body 40, the connecting rod 50 having a diameter smaller than the diameter of the sleeve body 10; the first end of the connecting rod 50 is in threaded connection with the first end of the connecting body 40, the second end is provided with a wire inlet 501 for passing through a welding wire, and the connecting rod is locked by a third fastener. The connecting rod 50 is formed integrally, and the sleeve body 10 is sleeved outside the connecting rod 50 and does not interfere with each other. The third fastener is a compression screw 504. The first end, namely the top end, of the connecting rod 50 is fixedly connected with the connecting body 40 through threads, and the second end, namely the bottom end, is prefabricated with a wire inlet 501 and is compressed by a compression screw 504, so that the safety, convenience and quickness are realized. Specifically, a third internal thread 405 is disposed on the connecting portion 403 of the connecting body 40, a third external thread 502 matched with the third internal thread 405 is disposed on the first end of the connecting rod 50, and the third internal thread 405 and the second external thread 404 are matched to connect the connecting rod 50 and the connecting body 40, so that the connecting rod is convenient to mount and dismount. The connecting rod 50 is provided with a square 503 for convenient operation. A plurality of bolt holes 505 are formed at the second end of the connecting rod 50, and the weld line is fixed and locked by passing the compression screws 504 through the bolt holes 505.

In some embodiments, as shown in fig. 1, 10 and 11, the sleeve body 10 includes a first sleeve 101 and a second sleeve 102 connected to each other, the first sleeve 101 and the second sleeve 102 are connected by screw threads, the length of the first sleeve 101 is smaller than the length of the connecting rod 50 from the first end to the third fastening member, and the length of the sleeve body 10 is slightly larger than the length of the connecting rod 50. The length of the first sleeve 101 is set so as not to affect the installation of the compression screw 504, and the length of the whole sleeve body 10 increases the safety of the personnel operation. The connecting portion 403 is provided with a second external thread 404, and the first end of the first sleeve 101 is provided with a first internal thread 103 matching with the second external thread 404 to connect the connecting body 40 and the first sleeve 101. The second end of the first sleeve 101 is provided with a first external thread 105, and the end of the second sleeve 102 is provided with a second internal thread 104 which is matched with the first external thread 105, so that the first sleeve 101 and the second sleeve 102 can be conveniently mounted and dismounted. The first sleeve 101 is an insulating material and the second sleeve 102 is an insulating material. The first sleeve 101 and the second sleeve 102 are connected by internal and external threads, and can effectively insulate and protect. The first end of first sleeve 101 is the hexagon of prefabricating in advance, and is convenient during the installation, if convenient centre gripping when using spanner pliers.

In some embodiments, the connecting rod 50, the connecting body 40, the clamping assembly 20, and the bridging device 30 are all conductive materials, such as metal materials, which meet the requirements of electric welding.

The installation process of the electric welding device provided by the invention comprises the following steps: the clamp assembly 20 is installed into the bridge 30 and secured with the set screw 303. The bridge 30 is connected to the connecting body 40 using bolts 304 and secured using wing nuts 305. The third male screw 502 of the top end of the connecting rod 50 is fitted with the third female screw 405 of the connecting body 40. The first internal thread 103 on the top of the first sleeve 101 is connected to the second external thread 404 of the connecting body 40, and the second internal thread 104 on the second sleeve 102 is fitted with the first external thread 105 on the bottom of the first sleeve 101.

The working principle of one embodiment of the invention is as follows: during the use, at first in the inlet 501 of welding line installation on connecting rod 50 to fasten with housing screw 504, clockwise rotation shell 204 makes and forms the centre gripping space between a plurality of cramping bodies 202, the installation welding rod, anticlockwise rotation shell 204 drives a plurality of cramping bodies 202 and removes along slant removal channel 2015 under the effect of rotor 203 cooperation spiral principle, realizes automatic centering and presss from both sides tightly. If multiple welding patterns are desired, wing nut 305 may be loosened to angle bridge 30.

The electric welding apparatus of the present invention has been described in detail with reference to the preferred embodiments thereof, however, it should be noted that those skilled in the art can make modifications, alterations and adaptations to the above disclosure without departing from the spirit of the present invention. The invention includes the specific embodiments described above and any equivalents thereof.

Claims

1. An electric welding device, comprising a sleeve body (10) and a clamping assembly (20) connected to the sleeve body (10), wherein:

the clamping assembly (20) comprises an installation seat (201), a plurality of clamping bodies (202) and a rotating body (203), and a through hole (2011) which penetrates in the axial direction is formed in the installation seat (201);

the mounting base (201) is further provided with a plurality of inclined moving channels (2015) which correspond to the clamping bodies (202) in a one-to-one mode and extend to the outer end face of the mounting base (201), and the plurality of clamping bodies (202) penetrate through the corresponding inclined moving channels (2015) and can reciprocate along the extending direction of the inclined moving channels (2015); a clamping surface for clamping a workpiece is arranged on one opposite side of the clamping bodies (202), a first threaded part (2021) is arranged on one opposite side of the clamping bodies (202), a second threaded part (2031) matched with the first threaded part (2021) is arranged in the rotating body (203), the rotating body (203) and the mounting seat (201) are coaxially arranged, and when the rotating body (203) rotates around the axis of the rotating body, the clamping bodies (202) move oppositely or reversely along the oblique moving channel (2015);

the mounting seat (201) comprises a first seat body (2012), a second seat body (2013) and a third seat body (2014) which are sequentially connected, the second seat body (2013) is conical, the diameter of the joint of the second seat body (2013) and the first seat body (2012) is smaller than the diameter of the joint of the second seat body (2013) and the third seat body (2014), and the first threaded part (2021) protrudes out of the outer wall surface of the second seat body (2013); the rotating body (203) is sleeved on the second seat body (2013), and a second threaded part (2031) of the rotating body (203) is a conical thread;

the inclined moving channel (2015) inclines towards the inside of the through hole (2011), and the inclination angle of the inclined moving channel and the central axis of the through hole (2011) is 10-15 degrees;

the electric welding device further comprises a bridging device (30) and a connecting body (40), wherein the bridging device (30) comprises a thin-wall sleeve (301), the thin-wall sleeve (301) is sleeved on the clamping component (20), the first end of the connecting body (40) is in threaded connection with the sleeve body (10), and the second end of the connecting body is rotatably connected with the bridging device (30);

the clamping assembly (20) further comprises a shell (204), the shell (204) is in interference connection with the rotating body (203), and the thin-wall sleeve (301) is sleeved on the shell (204) and locked through a first fastener.

2. The electric welding device according to claim 1, characterized in that said first fastening member is a fastening screw (303), and said thin-walled sleeve (301) is provided with a threaded hole extending radially along said thin-walled sleeve (301) and cooperating with said fastening screw (303).

3. The electric welding device according to claim 1, characterized in that an ear ring (401) is arranged on said connecting body (40), said bridging device (30) further comprises an ear ring seat connected with said thin-walled sleeve (301), said ear ring seat comprises two oppositely arranged ear plates (302), said ear ring (401) is arranged between two of said ear plates (302) and is connected by a second fastening member.

4. The electric welding device according to claim 3, characterized in that a first connecting hole (4011) is arranged on the ear ring (401), a second connecting hole (3021) matched with the first connecting hole (4011) is arranged on the ear piece (302), and the second fastener comprises a bolt (304) penetrating through the first connecting hole (4011) and the second connecting hole (3021) and a butterfly nut (305) threaded on the bolt (304).

5. The electric welding device according to claim 1, characterized in that it further comprises a connecting rod (50) connected to a first end of said connecting body (40), said connecting rod (50) having a diameter smaller than the diameter of said sleeve body (10); the first end of the connecting rod (50) is in threaded connection with the first end of the connecting body (40), the second end of the connecting rod is provided with a wire inlet (501) for penetrating a welding wire, and the connecting rod is locked by a third fastener.

6. The electric welding device according to claim 5, characterized in that said sleeve body (10) comprises a first sleeve (101) and a second sleeve (102) connected to each other, said first sleeve (101) and said second sleeve (102) being screwed, said first sleeve (101) having a length smaller than the length of said connecting rod (50) from the first end to said third fastening, said sleeve body (10) having a length slightly greater than the length of said connecting rod (50).

7. The electric welding device according to claim 5, characterized in that said connecting rod (50), said connecting body (40), said clamping assembly (20) and said bridging device (30) are all of electrically conductive material.