阅读说明：本技术 一种具有保护作用的氩弧焊机 (Argon arc welding machine with protective action ) 是由 尤志春 孙慧博 胡星 于 2021-04-02 设计创作，主要内容包括：本发明公开了一种具有保护作用的氩弧焊机,包括降低冷却水管周围冷凝水增加电子设备风险的保护罩；保护罩固定安装在弧焊机外壳的内部下方,所述保护罩是由阻燃塑料成型成的矩形筒状结构,矩形筒状结构用于将弧焊机外壳内的出水管、回水管和出气管与电气系统分割在两个相互独立的空间内。本发明在结构方面通过隔绝冷却系统与电气系统,以杜绝因为较冷的管道上凝结水汽对电气系统的干扰,以提高电气系统的使用寿命；同时通过设置定向气流通道增强设备的散热效果。(The invention discloses an argon arc welding machine with a protection effect, which comprises a protective cover for reducing condensed water around a cooling water pipe and increasing the risk of electronic equipment; the protective cover is fixedly arranged below the inner part of the arc welding machine shell, the protective cover is a rectangular tubular structure formed by flame-retardant plastics, and the rectangular tubular structure is used for dividing a water outlet pipe, a water return pipe and an air outlet pipe in the arc welding machine shell and an electric system into two mutually independent spaces. In the aspect of structure, the cooling system and the electrical system are isolated, so that the interference of condensed water vapor on a relatively cold pipeline to the electrical system is avoided, and the service life of the electrical system is prolonged; meanwhile, the heat dissipation effect of the equipment is enhanced by arranging the directional airflow channel.)

1. An argon arc welding machine with a protection function is characterized by comprising a protective cover (3) which reduces condensed water around a cooling water pipe and increases the risk of electronic equipment; protection cover (3) fixed mounting is in the inside below of arc-welding machine shell (1), protection cover (3) are the rectangle tubular structure that becomes by fire-retardant plastics shaping, and rectangle tubular structure is used for cutting apart outlet pipe (6), wet return and outlet duct and the electric system in the arc-welding machine shell in two mutually independent spaces.

2. The argon arc welding machine with the protection function according to claim 1, wherein the protective cover (3) is further provided with an air guide heat dissipation structure, the air guide heat dissipation structure comprises an air inlet cover (9) which is provided with an air outlet at the upper part of the rear end of the air inlet cover and is integrally connected with a wide opening at one side of the air outlet far away from the rear end, the air inlet cover (9) is opened towards the rear part of the arc welding machine shell (1), a screw connection seat is integrally formed on the inner wall of the air inlet cover (9), the exhaust fan (11) is fixedly connected in the air inlet cover (9) through screws, and the output end of the exhaust fan (11) faces outwards; air inlets (4) are formed in two sides of the front end of the protective cover (3), and the air inlets (4) correspond to air inlet grids formed on side plates on two sides of the arc welding machine shell (1).

3. The argon arc welding machine with protection function according to claim 1 or 2, wherein one end of the water outlet pipe (6), the water return pipe and the air outlet pipe in the protection cover (3) facing the front panel of the arc welding machine shell (1) are respectively connected with the front water outlet quick connector (5), the front water return quick connector and the front air outlet quick connector (6), and one end of the water outlet pipe (6), the water return pipe and the air outlet pipe facing the rear panel of the arc welding machine shell (1) are respectively connected with the rear water outlet connecting copper pipe (10), the rear water return connecting copper pipe and the rear air outlet connecting copper pipe.

4. The argon arc welding machine with the protection function according to claim 3, wherein the protection cover (3) is further fixedly connected with a micro water pump (2), an input end of the micro water pump (2) is connected with a first port of a tee joint through a hose, an output end of the micro water pump (2) is connected with a first port of another tee joint through another hose, a second port of the tee joint at the output end of the micro water pump (2) is connected with the front water outlet quick connector (5) through a pipeline, a second port of the tee joint at the input end of the micro water pump (2) is connected with the rear water outlet connecting copper pipe (10) through a pipeline, a third port of the tee joint at the output end of the micro water pump (2) is connected with a third port of the tee joint at the input end of the micro water pump (2) through a one-way valve (7), and the rear water outlet connecting copper pipe (10) is connected.

5. The argon arc welding machine with protection function according to claim 4, wherein a beam (14) is welded at the position of the inner frame of the arc welding machine shell (1) at the rear end, the beam (14) is used for hanging a water tank (12), a hook (13) with a downward opening is vertically connected to one side surface of the water tank (12) facing to the back surface of the arc welding machine shell (1), a water inlet hole and a water outlet hole are respectively formed in the top and the bottom of one side of the water tank (12), and a connecting copper pipe is welded on the water inlet hole and the water outlet hole so as to connect a water outlet pipe and a water return pipe through a rubber hose.

6. The argon arc welding machine with the protection function according to claim 5, wherein a reinforcing aluminum plate (18) is welded at the bottom of the water tank (12), the positions, close to four corners, of the reinforcing aluminum plate (18) are connected with a radiator (17) through a pre-tightening mechanism, a semiconductor refrigerating mechanism (24) capable of being plugged and unplugged is installed on the radiator (17) and the reinforcing aluminum plate (18), cooling of water in the water tank (12) is achieved through the semiconductor refrigerating mechanism, and water temperature rising caused by temperature accumulation is avoided being too high; the pre-tightening mechanism is composed of studs (19), springs (20) and nuts (21), the studs (19) are in threaded connection with threaded holes formed in the reinforcing aluminum plate (18), through holes correspondingly formed in the positions of four corners of the radiator (17) penetrate through the corresponding studs (19), the nuts (21) are connected to the lower ends of the studs, the springs (20) are arranged between the nuts (21) and the radiator (17), and the semiconductor refrigerating mechanism (24) is pressed through the adjusting distance of the nuts and the resetting force of the springs; the radiator (17) is hung to the position of the exhaust fan (11), and the exhaust fan (11) inclines 30-45 degrees upwards to the back of the arc welding machine shell (1).

7. The argon arc welding machine with the protection function according to claim 6, wherein the semiconductor refrigeration mechanism (24) is composed of a semiconductor refrigeration piece clamp (28) and a semiconductor refrigeration piece, the semiconductor refrigeration piece clamp (28) is formed by bending a U-shaped stainless steel sheet, the width of a clamping area of the semiconductor refrigeration piece clamp (28) is equal to the width of the semiconductor refrigeration piece, the thickness of the semiconductor refrigeration piece clamp (28) is smaller than that of the semiconductor refrigeration piece, two ends of the U-shaped semiconductor refrigeration piece clamp (28) form a reducing opening (29) relative to the inner groove, and when the semiconductor refrigeration piece is inserted into the semiconductor refrigeration piece clamp (28), the reducing opening (29) can play a limiting role to prevent the semiconductor refrigeration piece from sliding out and moving; one sides of the semiconductor refrigeration piece clips (28) behind the necking are connected through a supporting plate (27); wire inlet and outlet grooves (26) are formed in the middle of the semiconductor refrigeration piece clamp (28), so that a power supply wire of the semiconductor refrigeration piece clamp (28) can conveniently penetrate through the wire inlet and outlet grooves, the edge of the middle of the semiconductor refrigeration piece clamp (28) extends downwards to form a connecting lug (25), a through hole is formed in the connecting lug (25), and the side face of the semiconductor refrigeration piece clamp is connected with a threaded hole formed in the side face of a radiator (17) through a screw.

8. The argon arc welding machine with protection function according to claim 7, wherein a USB power supply terminal is installed on the back plate of the arc welding machine shell (1), the USB power supply terminal is connected with a power interface through a transformer so as to be connected with an arc welding machine electric control system in parallel at a power position, and a USB plug is welded on the power supply section of the semiconductor refrigeration piece (28) and the micro water pump (2).

9. The argon arc welding machine with protection of any one of claims 1-8, further comprising a current controller, wherein the current controller is configured by an embedded development singlechip to set the period, frequency, duty ratio and precision of the waveform, so that the current can alternately realize the specified waveform, the current controller is installed between an operating current output terminal in an electric control system of the arc welding machine and a power supply plug installed on a housing of the arc welding machine, and the method for controlling the current by the current controller is as follows:

1) in one period, the negative half cycle of the current is 5 to 25 percent larger than the positive half cycle;

2) switching points are set by switching positive and negative half cycles of current;

3) the current negative half cycle is provided with salient points, the salient point time is 10% -25% of the negative half cycle time, and the current magnitude is 5% -25% of the negative half cycle current.

Technical Field

The invention relates to an argon arc welding machine, in particular to an argon arc welding machine with a protection function.

Background

Argon arc welding machines are widely used in the industrial field, in particular stainless steel welding; the argon arc welding machine comprises a machine body and a welding handle which are generally separated, wherein the argon arc welding machine outputs current to an electrode which is made of active tungsten and is not melted, and then an arc starting mode of high-voltage breakdown is adopted. During use, the tungsten electrode is provided with inert gas to protect arc welding, and the inert gas is argon.

At present, argon arc welding mainly comprises equipment used at fixed points and equipment used outdoors, wherein the equipment used at the fixed points can be connected with cooling water to realize cooling, so that the equipment can work for a long time; the equipment used outdoors is convenient to move, generally does not have cooling equipment, so that the equipment cannot continuously work; meanwhile, because gas and cooling water are integrated in the argon arc welding machine, water vapor is easily condensed on the surface of the pipeline relative to the internal high temperature, the water vapor is more likely to be evaporated for the second time to rise to an electric part, so that the potential hazard is greater, and the aging of components is most easily caused.

Disclosure of Invention

The invention aims to provide an argon arc welding machine with a protection function so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

an argon arc welding machine with protection function comprises a protective cover which reduces condensed water around a cooling water pipe and increases the risk of electronic equipment; the protective cover is fixedly arranged below the inner part of the arc welding machine shell, the protective cover is a rectangular tubular structure formed by flame-retardant plastics, and the rectangular tubular structure is used for dividing a water outlet pipe, a water return pipe and an air outlet pipe in the arc welding machine shell and an electric system into two mutually independent spaces.

As a further scheme of the invention: the protective cover is also provided with an air guide heat dissipation structure, the air guide heat dissipation structure comprises an air inlet cover, an air outlet is formed above the upper part of the rear end of the air inlet cover, a wide-mouth air inlet cover is integrally connected to one side, away from the rear end, of the air outlet, the opening of the air inlet cover faces the rear part of the arc welding machine shell, a screw connecting seat is integrally formed on the inner wall of the air inlet cover, an exhaust fan is fixedly connected into the air inlet cover through screws, and the output end of the exhaust fan faces; air inlets are formed in two sides of the front end of the protective cover and correspond to air inlet grids formed in side plates on two sides of the shell of the arc welding machine.

As a further scheme of the invention: the one end that outlet pipe, wet return and outlet duct in the safety cover towards arc-welding machine shell front panel is connected preceding play water quick connector, preceding return water quick connector and the quick connector of preceding gas outlet respectively, and the one end that outlet pipe, wet return and outlet duct towards arc-welding machine shell rear panel is connected the water connection copper pipe of back play respectively, back return water connection copper pipe and the connection copper pipe of giving vent to anger of back.

As a further scheme of the invention: still fixed connection miniature pump on the guard shield, miniature pump's input passes through the first port of hose connection tee bend, miniature pump's output passes through the first port of another tee bend of other hose connection, the quick interface of water of going out before the tee bend second port of miniature pump output passes through the pipe connection, the tee bend second port of miniature pump input goes out the water after the pipe connection and connects the copper pipe, the tee bend third port of miniature pump output passes through the three-way third port of check valve connection miniature pump input, the one-way back of switching on of check valve goes out the water and connects the confession of the quick interface of water of going out before the copper pipe.

As a further scheme of the invention: the welding of the position that the inner frame of arc-welding machine shell is located the rear end has a crossbeam, and the crossbeam is used for hanging the water tank, is connected with the couple that the opening is down on the water tank is towards the side at the arc-welding machine shell back perpendicularly, inlet opening and apopore are seted up respectively to the top and the bottom of water tank one side, and the welding has the connection copper pipe on inlet opening and the apopore to be convenient for connect outlet pipe and wet return through rubber hose.

As a further scheme of the invention: the bottom of the water tank is welded with a reinforcing aluminum plate, the positions, close to four corners, of the reinforcing aluminum plate are connected with the radiator through a pre-tightening mechanism, the radiator and the reinforcing aluminum plate are provided with a pluggable semiconductor refrigerating mechanism, cooling of water in the water tank is achieved through the semiconductor refrigerating mechanism, and over-high water temperature caused by temperature accumulation is avoided; the pre-tightening mechanism is composed of a stud, a spring and a nut, the stud is in threaded connection with a threaded hole formed in the reinforced aluminum plate, through holes correspondingly formed in the four corners of the radiator penetrate through the corresponding stud, the lower end of the stud is connected with the nut, the spring is arranged between the nut and the radiator, and the semiconductor refrigeration mechanism is pressed through the adjusting distance of the nut and the resetting force of the spring; the radiator is dropped to the position of the exhaust fan, and the exhaust fan is inclined 30-45 degrees above the back of the arc welding machine shell.

As a further scheme of the invention: the semiconductor refrigeration mechanism is composed of a semiconductor refrigeration piece clamp and a semiconductor refrigeration piece, the semiconductor refrigeration piece clamp is formed by bending a U-shaped stainless steel sheet, the width of a clamping area of the semiconductor refrigeration piece clamp is equal to that of the semiconductor refrigeration piece, the thickness of the semiconductor refrigeration piece clamp is smaller than that of the semiconductor refrigeration piece, two ends of the U-shaped semiconductor refrigeration piece clamp form necking relative to the inner groove, when the semiconductor refrigeration piece is inserted into the semiconductor refrigeration piece clamp, the necking position can play a limiting role, and the semiconductor refrigeration piece is prevented from sliding out and moving disorderly; one sides of the semiconductor refrigerating sheet clamp behind the necking are connected through a supporting plate; the middle part of the semiconductor refrigeration film clamp is provided with a wire inlet and outlet slot, so that a power supply wire of the semiconductor refrigeration film clamp can conveniently pass through the slot, the edge of the middle part of the semiconductor refrigeration film clamp extends downwards to form a connecting lug, and a through hole is formed in the connecting lug and is connected with a threaded hole formed in the side surface of a radiator through a screw.

As a further scheme of the invention: the back plate of the arc welding machine shell is provided with a USB power supply terminal, the USB power supply terminal is connected with a power supply interface through a transformer so as to be connected with an arc welding machine electric control system in parallel at a power supply position, and the power supply sections of the semiconductor refrigeration piece and the micro water pump are both welded with a USB plug.

As a further scheme of the invention: the arc welding machine further comprises a current controller, the current controller sets the period, the frequency, the duty ratio and the precision of the waveform by an embedded development singlechip, so that the current alternately realizes the specified waveform, the current controller is installed between a working current output terminal in an electric control system of the arc welding machine and a power supply plug installed on a shell of the arc welding machine, and the method for controlling the current by the current controller is as follows:

1) in one period, the negative half cycle of the current is 5 to 25 percent larger than the positive half cycle;

2) switching points are set by switching positive and negative half cycles of current;

3) the current negative half cycle is provided with salient points, the salient point time is 10% -25% of the negative half cycle time, and the current magnitude is 5% -25% of the negative half cycle current.

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

in the aspect of structure, the cooling system and the electrical system are isolated, so that the interference of condensed water vapor on a relatively cold pipeline to the electrical system is avoided, and the service life of the electrical system is prolonged; meanwhile, the heat dissipation effect of the equipment is enhanced by arranging the directional airflow channel.

The argon arc welding device is also provided with the external water tank, so that the argon arc welding device can be used outdoors for a long time, the time of rest due to overheating is reduced, and the working efficiency is improved.

The invention enhances the cleaning effect by setting the current controller to control the current output, namely:

(1) the purpose that the negative half cycle of the current is 5% -25% larger than the positive half cycle is to enhance the cleaning effect, so that the welding seam is smoother and the generation of bubbles is reduced;

(2) the switching point is set by switching the current in the positive and negative half cycles so as to weaken the switching loss of the IGBT and protect the IGBT; arc breakage caused by alternating current and direct current switching is effectively avoided;

(2) the purpose of arranging the salient points in the negative half cycle of the current is to further enhance the cleaning effect on the basis of (1); the short bump current time enhances the cleaning effect and does not cause excessive loss to a tungsten rod of the argon arc welding gun.

Drawings

FIG. 1 is a schematic structural diagram of a protective cover in an argon arc welding machine with a protective function.

Fig. 2 is a schematic structural view of a front cross section of fig. 1.

Fig. 3 is a left side view of fig. 1.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

Fig. 5 is a schematic structural diagram of the semiconductor refrigeration mechanism.

FIG. 6 is a square-wave graph of current output by a conventional argon arc welding machine.

Fig. 7 is a graph of a current square wave output controlled by a current controller.

Fig. 8 is a schematic diagram of the division of the square wave diagram of fig. 7.

Detailed Description

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

Example 1

Referring to fig. 1 to 5, in an embodiment of the invention, an argon arc welding machine with a protection function includes a protection cover 3 for reducing the risk of increasing the electronic equipment by the condensed water around the cooling water pipe.

The safety cover 3 is the rectangle tubular structure that is formed by the fire-retardant plastics, safety cover 3 is located the inside below of arc welding machine shell 1, the both ends of safety cover 3 are passed through the screw connection and are on the panel medial surface around arc welding machine shell 1, be provided with outlet pipe 6 in the safety cover 3, wet return and outlet duct, outlet pipe 6, water return and outlet duct go out water quick interface 5 before the one end of panel is connected respectively before arc welding machine shell 1, preceding return water quick interface and the quick interface 6 of giving vent to anger before, outlet pipe 6, water return and outlet duct are connected respectively to the one end of panel behind arc welding machine shell 1 and are gone out water connection copper pipe 10 after, back return water connection copper pipe and the connection. An air outlet is formed in the upper portion of the rear end of the protective cover 3, a wide-mouth air inlet cover 9 (two sides of one plate are bent) is integrally connected to one side, away from the rear end, of the air outlet, a screw connecting seat is integrally formed on the inner wall of the air inlet cover 9, the air outlet fan 11 is fixedly connected into the air inlet cover 9 through screws, and the output end of the air outlet fan 11 faces outwards; the exhaust fan 11 inclines 30-45 degrees to the upper part of the back surface of the arc welding machine shell 1, and the inclined design aims at accelerating heat dissipation upwards and assisting heat dissipation of a water tank which is lost after matching; air intake 4 has been seted up to the front end both sides of safety cover 3, air intake 4 corresponds the air-inlet grille who sets up on the arc welding machine shell 1 both sides curb plate, flow with the air current through air inlet cover 9 is inside, can prevent condenser pipe and trachea surface because the condensation steam secondary evaporation that the temperature reduction produced from rising to the circuit board of top, discharge moisture that simultaneously can be quick, the secondary flow that passes through air inlet cover 9 interior air current in addition makes air inlet cover 9's surface temperature be in a level that is less than the surrounding environment always, and then realize auxiliary arc welding machine's heat dissipation, above-mentioned condition is summer especially, protection argon arc welding machine that can be better, prolong its life.

The front panel of the arc welding machine shell 1 is also fixedly provided with a power supply plug, and the end part of the air inlet cover 9 corresponding to the part of the power supply plug positioned in the arc welding machine shell 1 is internally provided with a concave groove so as to facilitate the connection of an electric wire.

The rear water outlet connecting copper pipe 10, the rear water return connecting copper pipe and the rear gas outlet connecting copper pipe can be copper pipes, the outer inlet of each copper pipe is larger than the inner diameter of the corresponding pipeline, and the end part closing-up of each copper pipe is smaller than the inner diameter of the corresponding pipeline, so that the copper pipes can be inserted into the pipeline to realize connection; and the interface on the front panel is used for connecting the handle that needs frequent removal, so need adopt comparatively stable and quick-operation joint's quick interface to reduce cost and satisfy needs, the copper pipe of the rear of course can also be changed into quick-operation joint.

The front water outlet quick connector 5, the front water return quick connector, the front air outlet quick connector 6, the rear water outlet connecting copper pipe 10, the rear water return connecting copper pipe and the rear air outlet connecting copper pipe are fixedly connected to two ends of the protective cover 3, and through holes for the connectors and the copper pipes to penetrate through are correspondingly formed in front and rear panels of the arc welding machine shell 1.

The protective cover 3 is also fixedly connected with a micro water pump 2, the input end of the micro water pump 2 is connected with a first port of a tee joint through a hose, the output end of the micro water pump 2 is connected with a first port of another tee joint through another hose, a second port of the tee joint at the output end of the micro water pump 2 is connected with a front water outlet quick connector 5 through a pipeline, a second port of the tee joint at the input end of the micro water pump 2 is connected with a rear water outlet connecting copper pipe 10 through a pipeline, a third port of the tee joint at the output end of the micro water pump 2 is connected with a third port of the tee joint at the input end of the micro water pump 2 through a one-way valve 7, and the one-way valve 7 is communicated; the structure can enable the micro water pump 2 to participate in cooling water circulation, accelerate heat dissipation of the handle position and be used for long-time work; in addition, the micro water pump 2 can also be used in cooperation with an outdoor mounted water tank.

A cross beam 14 is welded at the position, located at the rear end, of an inner frame of the arc welding machine shell 1, the cross beam 14 is used for hanging a water tank 12, a hook 13 with a downward opening is vertically connected to one side face, facing the back face of the arc welding machine shell 1, of the water tank 12, and when the shell is actually designed, a vertical sliding groove for inserting the hook 13 is correspondingly formed in a back plate of the arc welding machine shell 1. The top of the water tank 12 is provided with a hole and welded with a pipe with external threads, and the upper end of the pipe is in threaded connection with a cover, so that water can be conveniently added; the top and the bottom of water tank 12 one side are seted up inlet opening and apopore respectively, and wherein the one end of extension pipe is connected to the inlet opening, and the extension pipe is along the downward and other end of the surperficial bending of water tank 12 and flush with the apopore, and the other end and the apopore of extension pipe have all been welded and are connected the copper pipe to go out water connection copper pipe 10 and back return water connection copper pipe after connecting through rubber hose, realize the handle cooling among the outdoor working process, in order to improve the time that outdoor equipment used, improve work efficiency.

The bottom of the water tank 12 is welded with a reinforcing aluminum plate 18, the positions, close to four corners, of the reinforcing aluminum plate 18 are connected with a radiator 17 through a pre-tightening mechanism, the radiator 17 and the reinforcing aluminum plate 18 are provided with a semiconductor refrigerating mechanism 24 which can be plugged, and the water in the water tank 12 is cooled through the semiconductor refrigerating mechanism, so that the water temperature is prevented from rising too high due to temperature accumulation; the pre-tightening mechanism is composed of a stud 19, a spring 20 and a nut 21, the stud 19 is in threaded connection with a threaded hole formed in the reinforcing aluminum plate 18, through holes correspondingly formed in the four corners of the radiator 17 penetrate through the corresponding studs 19, the nut 21 is connected to the lower end of each stud, the spring 20 is arranged between the nut 21 and the radiator 17, and the semiconductor refrigerating mechanism 24 is pressed through the adjusting distance of the nut and the resetting force of the spring.

The semiconductor refrigerating mechanism 24 is composed of a semiconductor refrigerating piece clamp 28 and semiconductor refrigerating pieces, the semiconductor refrigerating piece clamp 28 is formed by bending a U-shaped stainless steel piece, the width of a clamping area of the semiconductor refrigerating piece clamp 28 is equal to the width of the semiconductor refrigerating piece, the thickness of the semiconductor refrigerating piece clamp 28 is smaller than that of the semiconductor refrigerating piece, two ends of the U-shaped semiconductor refrigerating piece clamp 28 form a reducing opening 29 relative to an inner groove, when the semiconductor refrigerating pieces are inserted into the semiconductor refrigerating piece clamp 28, the reducing opening 29 can play a limiting role, and the semiconductor refrigerating pieces are prevented from sliding out and moving randomly; one side of the semiconductor refrigeration piece clamp 28 behind the necking is connected through a supporting plate 27; the middle part of the semiconductor refrigeration piece clamp 28 is provided with a wire inlet and outlet slot 26 for a power supply wire of the semiconductor refrigeration piece clamp 28 to pass through conveniently, the edge of the middle part of the semiconductor refrigeration piece clamp 28 extends downwards to form a connecting lug 25, and the connecting lug 25 is provided with a through hole and is connected with a threaded hole formed in the side surface of the radiator 17 through a screw, so that the replacement is convenient; the semiconductor cooling plate 28 is positioned at the lower cooling position during actual use to ensure that the temperature of the output cold water is the lowest.

The back plate of the arc welding machine shell 1 is provided with a USB power supply terminal, the USB power supply terminal is connected with a power supply interface through a transformer (the output is 3V), so that the USB power supply terminal and an arc welding machine electric control system are connected in parallel at a power supply position, and USB plugs are welded on the power supply sections of the semiconductor refrigeration piece 28 and the micro water pump 2, so that power supply is conveniently realized.

Example 2

Referring to fig. 2, the invention further comprises a current controller, wherein the current controller sets the period, frequency, duty ratio and precision of the waveform by an embedded development singlechip, so that the current alternately realizes the specified waveform, the current controller is installed between a working current output terminal in an electric control system of the arc welding machine and a power supply plug installed on an arc welding machine shell 1, and the method for controlling the current by the current controller is as follows:

1) in one period, the negative half cycle of the current is 5 to 25 percent larger than the positive half cycle;

2) switching points are set by switching positive and negative half cycles of current;

3) the current negative half cycle is provided with salient points, the salient point time is 10% -25% of the negative half cycle time, and the current magnitude is 5% -25% of the negative half cycle current.

Referring to fig. 3, 0-7 division points are set for the waveform diagram in one period, and the waveform diagram is divided into 7 segments, namely 0-1, 1-2, 2-3, 3-4, 4-5, 5-6 and 6-7;

in the seven sections, the novel waveform diagram can be realized by respectively giving corresponding given values.

T1/f, duty cycle T negative half cycle time T positive half cycle time T negative half cycle time.

The time of the switching point (0-1) is determined by the fall time of the maximum current to the switching point current.

The accuracy is the minimum time interval for a given value, and at the same time the accuracy determines the minimum period.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.