阅读说明：本技术 多源同轴等离子弧熔覆工艺及设备 (Multi-source coaxial plasma arc cladding process and equipment ) 是由 锁红波 李相金 赵凯 于 2020-06-22 设计创作，主要内容包括：本发明公开了多源同轴等离子弧熔覆工艺及设备,该设备包括焊枪机构,送料机构,电源机构和离子气供气装置；焊枪机构包括等离子弧发生部件,等离子弧发生部件包括阴极棒和下枪体,电源机构的引弧电路的正极和负极分别电连接下枪体和阴极棒,下枪体包括离子气流道和导电喷嘴,阴极棒插设于所述离子气流道内,焊枪机构包括送料导嘴和多个阴极棒,下枪体包括与阴极棒一一对应设置的离子气流道和导电喷嘴,多个导电喷嘴的喷射口中轴线交汇于一点作为交汇点,交汇点位于送料导嘴出料口中轴线上,且位于送料导嘴出料口下方。该设备功率分布更平缓,焊缝熔深浅、熔宽大,更适于表面熔覆和增材制造,该设备既能提高焊缝质量,又能提高加工效率。(The invention discloses a multisource coaxial plasma arc cladding process and equipment, wherein the equipment comprises a welding gun mechanism, a feeding mechanism, a power supply mechanism and an ionic gas supply device; the welding gun mechanism comprises a plasma arc generation part, the plasma arc generation part comprises a cathode bar and a lower gun body, the anode and the cathode of an arc striking circuit of the power supply mechanism are respectively and electrically connected with the lower gun body and the cathode bar, the lower gun body comprises an ionic air flow channel and a conductive nozzle, the cathode bar is inserted in the ionic air flow channel, the welding gun mechanism comprises a feeding guide nozzle and a plurality of cathode bars, the lower gun body comprises the ionic air flow channel and the conductive nozzles which are arranged in one-to-one correspondence with the cathode bars, the central axes of the jet orifices of the conductive nozzles are intersected at one point to serve as an intersection point, and the intersection point is positioned on the central axis of the discharge port of the feeding guide nozzle and is positioned below the discharge. The equipment has the advantages of more gentle power distribution, shallow weld fusion depth and large weld fusion width, is more suitable for surface fusion covering and additive manufacturing, and can improve the weld quality and the processing efficiency.)

1. A multi-source coaxial plasma arc cladding device comprises a welding gun mechanism, a feeding mechanism for conveying fillers for the welding gun mechanism, a power supply mechanism for supplying power to the welding gun mechanism, and an ionic gas supply device for supplying ionic gas for the welding gun mechanism; the welding gun mechanism comprises a plasma arc generating component, the plasma arc generating component comprises a cathode bar and a lower gun body as an anode, the anode and the cathode of the arc striking circuit of the power supply mechanism are respectively and electrically connected with the lower gun body and the cathode bar, the lower gun body comprises an ion gas flow channel connected with the ion gas supply device, and a conductive nozzle installed at the lower port of the ion airflow channel, the cathode bar is inserted in the ion airflow channel, it is characterized in that the welding gun mechanism comprises a feeding guide nozzle connected with the feeding mechanism and a plurality of cathode bars, the lower gun body comprises ion airflow channels and conductive nozzles which are arranged corresponding to the cathode bars one by one, the central axes of the jet orifices of the conductive nozzles are intersected at one point to be used as an intersection point, the intersection point is positioned on the central axis of the discharge hole of the feeding guide nozzle and is positioned below the discharge hole of the feeding guide nozzle.

2. The multi-source coaxial plasma arc cladding apparatus of claim 1, further comprising a water cooling device to supply cooling fluid to the torch mechanism, a shielding gas supply device to supply shielding gas to the torch mechanism; the welding gun mechanism comprises a water-cooling heat exchange part used for heat dissipation of the plasma arc generation part and a protective gas flow channel used for providing protective gas for the plasma arc generation part, wherein the gas inlet of the protective gas flow channel is connected with a protective gas supply device, and the water-cooling heat exchange part is connected with a water cooling device.

3. The multi-source coaxial plasma arc cladding device according to claim 2, wherein the water-cooling heat exchange component comprises a cooling liquid cavity arranged in the lower gun body, a liquid inlet and a liquid outlet are formed in the upper portion of the cooling liquid cavity, and the liquid inlet and the liquid outlet are respectively connected with the water-cooling device through a cooling liquid outlet pipe and a cooling liquid return pipe.

4. The multi-source coaxial plasma arc cladding apparatus of claim 3, wherein the plurality of ion gas flow channels of the lower gun body all penetrate through the cooling liquid chamber, the ion gas flow channels are in sealed connection with the outer wall of the cooling liquid chamber, the feeding guide nozzle penetrates through the cooling liquid chamber and is in sealed connection with the outer wall of the cooling liquid chamber, and the discharge port of the feeding guide nozzle and the injection port of the conductive nozzle are both arranged outside the cooling liquid chamber.

5. The multi-source coaxial plasma arc cladding apparatus according to claim 4, wherein the welding torch mechanism comprises a shielding gas nozzle, the cooling liquid chamber is fixedly installed at the center of the shielding gas nozzle, a lower port capable of emitting shielding gas and plasma arc is opened at the bottom of the shielding gas nozzle, the shielding gas flow channel is formed between the inner wall of the shielding gas nozzle and the outer wall of the cooling liquid chamber, the gas inlet of the shielding gas nozzle is arranged at the upper part of the shielding gas nozzle, and the shielding gas supply device is connected with the gas inlet through a shielding gas flow pipeline.

6. The multi-source coaxial plasma arc cladding apparatus of claim 5, wherein the injection ports of the plurality of conductive nozzles of the lower gun body combine to form a main arc injection portion, the main arc injection portion being located in the center of the lower port of the shield gas nozzle.

7. The multi-source coaxial plasma arc cladding apparatus of claim 1, wherein an included angle α between a central axis of a jet orifice of the conductive nozzle and a central axis of a discharge port of the feeding guide nozzle is 0 ° < α ≦ 60 °.

8. The multi-source coaxial plasma arc cladding apparatus of claim 1, wherein the power supply mechanism comprises a multi-channel power supply, the multi-channel power supply comprises a plurality of output channels arranged in one-to-one correspondence with a plurality of the cathode bars, and the cathode bars and the conductive nozzles are connected with their corresponding output channels by cables.

9. The multi-source coaxial plasma arc cladding apparatus according to claim 1, wherein the ion gas flow channels are provided with ion gas inlets, the ion gas inlets are connected with the ion gas supply device through gas flow pipelines, each of the ion gas flow channels connecting the ion gas supply device and the ion gas flow channels is provided with a gas flow meter, and the cathode bar is set as a tungsten electrode.

10. A multi-source coaxial plasma arc cladding process, characterized in that the multi-source coaxial plasma arc cladding equipment of any one of claims 1 to 9 is adopted, and the process comprises the following steps:

equipment connection: the power supply mechanism is connected with the welding gun mechanism and a workpiece to be processed through a cable, the feeding mechanism is connected with the feeding guide nozzle through a feeding pipeline, and the ion gas supply device is connected with the ion gas flow channel through a gas flow pipeline;

material increase cladding: the welding gun mechanism moves to a preset position above a workpiece to be processed, the power supply mechanism and the ion gas supply device are started, and plasma arcs emitted by the jet orifices of the plurality of conductive nozzles converge to one point from different directions to form a main arc; and starting the feeding mechanism to enable the filler to be sent out from the discharge port of the feeding guide nozzle, melting the filler by the high-temperature main arc, entering a molten pool, and forming a welding seam on the workpiece to be processed after the filler is solidified, so that the additive cladding is completed.

Technical Field

The invention belongs to the technical field of metal part forming and processing, and particularly relates to a multi-source coaxial plasma arc cladding process and equipment.

Background

The plasma cladding technology is a means of performing arc restraint control on a nozzle by means of a water cooling system, obtaining a plasma arc with high energy density by taking a transferred arc as a heat source, and performing mechanical surface repair and remanufacture by means of various alloy powder and wire materials. The existing plasma arc cladding/surfacing equipment mostly adopts a single plasma arc as a heat source, and one or more paths of filling materials are fed to the plasma arc from the single side or the periphery of the plasma arc. When powder is used as a filling material, multiple paths of powder are focused below the plasma arc; when the wire material is used as a filler, the monofilament is fed from one side to the lower part of the plasma arc, i.e., so-called side-axis feeding.

However, the existing plasma arc cladding equipment has the following defects: 1. if the filling material is a wire material, the paraxial wire feeding mode of the filling material enables the appearance of the accumulated welding seam to have larger difference in different movement modes, accumulated errors can be caused when surface cladding and additive manufacturing are carried out, and the size precision is influenced. When the wires are fed reversely and laterally, the ends of the wires interfere with the formed welding lines, and the stability of wire feeding is influenced. Because the wire material and the piled welding seam interfere the plasma arc in the moving process, the arc length is changed, and the shape and the quality of the welding seam are adversely affected. 2. If the filling material is powder, the powder is difficult to completely melt because the powder enters the plasma arc from the outside to the inside, on one hand, the material utilization rate is reduced, and on the other hand, the unmelted powder enters the molten pool to possibly generate metallurgical defects. In order to improve the quality of welding seams, the existing plasma arc cladding equipment mostly adopts a mode of increasing plasma arc power or reducing powder conveying speed, but the operation can increase the heat input of a part matrix or reduce the cladding efficiency.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a multisource coaxial plasma arc cladding process and equipment. Compared with the existing plasma arc cladding equipment, the equipment has the advantages that the power distribution is smoother, the weld joint fusion depth is shallow, the weld joint fusion width is large, the equipment is more suitable for surface cladding and additive manufacturing, the quality of the weld joint can be improved, and the processing efficiency can be improved.

In order to achieve the purpose, the invention adopts the technical scheme that:

a multi-source coaxial plasma arc cladding device comprises a welding gun mechanism, a feeding mechanism for conveying fillers for the welding gun mechanism, a power supply mechanism for supplying power to the welding gun mechanism, and an ionic gas supply device for supplying ionic gas for the welding gun mechanism; the welding gun mechanism comprises a plasma arc generating part, the plasma arc generating part comprises a cathode bar and a lower gun body serving as an anode, the anode and the cathode of an arc striking circuit of the power supply mechanism are respectively and electrically connected with the lower gun body and the cathode bar, the lower gun body comprises an ion gas flow channel connected with the ion gas supply device and a conductive nozzle arranged at the lower port of the ion gas flow channel, the cathode bar is inserted in the ion gas flow channel, and the welding gun mechanism comprises a feeding guide nozzle connected with the feeding mechanism and a plurality of cathode bars; the lower gun body comprises an ion airflow channel and a plurality of conductive nozzles which are arranged in one-to-one correspondence with the cathode bars, the central axes of the jetting ports of the plurality of conductive nozzles are intersected at one point to be used as an intersection point, and the intersection point is positioned on the central axis of the discharge hole of the feeding guide nozzle and is positioned below the discharge hole of the feeding guide nozzle.

Preferably, the lower gun body is made of conductive metal.

Preferably, the multi-source coaxial plasma arc cladding equipment further comprises a water cooling device for supplying cooling liquid for the welding gun mechanism and a shielding gas supply device for supplying shielding gas for the welding gun mechanism; the welding gun mechanism comprises a water-cooling heat exchange part used for heat dissipation of the plasma arc generation part and a protective gas flow channel used for providing protective gas for the plasma arc generation part, wherein the gas inlet of the protective gas flow channel is connected with a protective gas supply device, and the water-cooling heat exchange part is connected with a water cooling device.

Preferably, the water-cooling heat exchange part comprises a cooling liquid cavity arranged in the lower gun body, a liquid inlet and a liquid outlet are formed in the upper portion of the cooling liquid cavity, and the liquid inlet and the liquid outlet are connected with the water cooling device through a cooling liquid outlet pipe and a cooling liquid return pipe respectively.

Preferably, the plurality of ion gas flow channels of the lower gun body penetrate through the cooling liquid cavity, the ion gas flow channels are connected with the outer wall of the cooling liquid cavity in a sealing mode, the feeding guide nozzle penetrates through the cooling liquid cavity, the feeding guide nozzle is connected with the outer wall of the cooling liquid cavity in a sealing mode, and the discharge hole of the feeding guide nozzle and the jet orifice of the conductive nozzle are arranged outside the cooling liquid cavity.

Preferably, the welding gun mechanism comprises a shielding gas nozzle, the cooling liquid cavity is fixedly arranged in the center of the shielding gas nozzle, a lower port capable of emitting shielding gas and plasma arc is formed in the bottom of the shielding gas nozzle, the shielding gas flow channel is formed between the inner wall of the shielding gas nozzle and the outer wall of the cooling liquid cavity, the gas inlet of the shielding gas nozzle is formed in the upper portion of the shielding gas nozzle, and the shielding gas supply device is connected with the gas inlet through a shielding gas flow pipeline.

Preferably, the plurality of conductive nozzles of the lower gun body are combined to form a main arc spraying portion, and the main arc spraying portion is located at the center of the lower port of the shield gas nozzle.

Preferably, the included angle alpha between the central axis of the jet orifice of the conductive nozzle and the central axis of the discharge port of the feeding guide nozzle is 0 degree < alpha < 60 degrees.

Preferably, the power supply mechanism comprises a multi-channel power supply, the multi-channel power supply comprises a plurality of output passages which are arranged in one-to-one correspondence with the plurality of cathode bars, and the cathode bars and the conductive nozzles are connected with the output passages corresponding to the cathode bars through cables.

Preferably, the ion gas flow channel is provided with an ion gas inlet, the ion gas inlet is connected with the ion gas supply device through a gas flow pipeline, each ion gas flow channel connecting the ion gas supply device and the ion gas flow channel is provided with a gas flow meter, and the cathode bar is a tungsten electrode.

The invention also discloses a multi-source coaxial plasma arc cladding process, which adopts the multi-source coaxial plasma arc cladding equipment and comprises the following steps:

equipment connection: the power supply mechanism is connected with the welding gun mechanism and a workpiece to be processed through a cable, the feeding mechanism is connected with the feeding guide nozzle through a feeding pipeline, and the ion gas supply device is connected with the ion gas flow channel through a gas flow pipeline;

material increase cladding: the welding gun mechanism moves to a preset position above a workpiece to be processed, the power supply mechanism and the ion gas supply device are started, and plasma arcs emitted by the jet orifices of the plurality of conductive nozzles converge to one point from different directions to form a main arc; and starting the feeding mechanism to enable the filler to be sent out from the discharge port of the feeding guide nozzle, melting the filler by the high-temperature main arc, entering a molten pool, and forming a welding seam on the workpiece to be processed after the filler is solidified, so that the additive cladding is completed.

Compared with the prior art, the invention has the advantages and positive effects that: provides a multi-source coaxial plasma arc cladding process and equipment. Compared with the existing plasma arc cladding equipment, the equipment has the advantages that the power distribution is smoother, the weld joint fusion depth is shallow, the weld joint fusion width is large, the equipment is more suitable for surface cladding and additive manufacturing, the quality of the weld joint can be improved, and the processing efficiency can be improved.

Drawings

FIG. 1 is a schematic structural view of a torch mechanism according to the present embodiment;

fig. 2 is a schematic structural diagram of the multi-source coaxial plasma arc cladding apparatus of the present embodiment;

fig. 3 is a schematic power connection diagram of the multi-source coaxial plasma arc cladding apparatus of the present embodiment;

in the above figure: 1-power supply mechanism, 11-multichannel power supply, 12-power plug, 2-welding gun mechanism, 21-ion gas flow channel, 211-ion gas inlet, 22-conductive nozzle, 23-cathode bar, 24-feeding guide nozzle, 25-protective gas flow channel, 251-gas inlet, 26-cooling liquid cavity, 261-liquid inlet, 262-liquid outlet, 27-protective gas nozzle, 271-lower port, 3-feeding mechanism, 31-feeding pipeline, 4-ion gas supply device, 41-ion gas flow channel, 5-cable, 51-anode cable, 52-cathode cable, 6-workpiece to be treated, 7-filler, 8-molten pool, 9-water cooling device, 91-cooling liquid outlet pipe, 92-cooling liquid return pipe, 10-protective gas supply device and 101-protective gas flow pipeline.

Detailed Description

The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "left", "right", "front", "rear", etc. indicate the positional relationship based on the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 3, a multi-source coaxial plasma arc cladding apparatus includes a welding gun mechanism 2, a feeding mechanism 3 for feeding a filler material to the welding gun mechanism 2, a power supply mechanism 1 for supplying power to the welding gun mechanism 2, and an ion gas supply device 4 for supplying ion gas to the welding gun mechanism 2; the welding gun mechanism 2 comprises a plasma arc generating component, the plasma arc generating component comprises a cathode bar 23 and a lower gun body as an anode, the anode and the cathode of an arc striking circuit of the power supply mechanism 1 are respectively and electrically connected with the lower gun body and the cathode bar 23, the lower gun body comprises an ion gas flow channel 21 connected with the ion gas supply device 4 and a conductive nozzle 22 arranged at the lower port of the ion gas flow channel 21, the cathode bar 23 is inserted in the ion gas flow channel 21, and the welding gun mechanism 2 comprises a feeding guide nozzle 24 connected with the feeding mechanism 3 and a plurality of cathode bars 23; the lower gun body comprises ion airflow channels 21 and conductive nozzles 22 which are arranged in one-to-one correspondence with the cathode bars 23, the central axes of the injection ports of the conductive nozzles 22 are intersected at one point to be used as an intersection point, and the intersection point is positioned on the central axis of the discharge hole of the feeding guide nozzle 24 and below the discharge hole of the feeding guide nozzle 24.

A multi-source coaxial plasma arc cladding process adopts the multi-source coaxial plasma arc cladding equipment, and comprises the following steps:

equipment connection: the power supply mechanism 1 is connected with the welding gun mechanism 2 and a workpiece 6 to be processed through a cable 5, the feeding mechanism 3 is connected with the feeding guide nozzle 24 through a feeding pipeline 31, and the ion gas supply device 4 is connected with the ion gas flow channel 21 through an ion gas flow channel 41;

material increase cladding: the welding gun mechanism 2 is moved to a preset position above a workpiece 6 to be processed, the power supply mechanism 1 and the ion gas supply device 4 are started, and plasma arcs emitted by the jet ports of the plurality of conductive nozzles 22 are converged to one point from different directions to form a main arc; and starting the feeding mechanism 3 to enable the filler 7 to be discharged from a discharge port of the feeding guide nozzle 24, melting the filler 7 by the high-temperature main arc, entering the molten pool 8, and forming a welding seam on the workpiece 6 to be processed after the filler is solidified, so that additive cladding is completed.

In the above process, the functional principle of the multi-source coaxial plasma arc cladding device of this embodiment is as follows: the power supply mechanism 1 is connected with the welding gun mechanism 2 through a cable 5, and the workpiece to be processed 6 is connected with the power supply mechanism 1 through the cable 5. When the device works, the power supply mechanism 1 is started, electric arcs are generated between the cathode bar 23 and the conductive nozzle 22, and the electric arcs are blown out through ion gas to form guide arcs. Moving the welding gun mechanism 2 to the workpiece 6 to be processed, and when the distance between the conductive nozzle 21 and the surface of the workpiece 6 to be processed is small enough (usually 2-10mm), transferring plasma arcs, generating plasma arcs between the workpiece 6 to be processed and the welding gun mechanism 2, melting the workpiece, and forming a molten pool 8; meanwhile, the feeding mechanism 3 feeds the filler 7 into the welding gun mechanism 2, and the filler is fed out through a feeding guide nozzle 24 on the welding gun mechanism 2, melted by high-temperature plasma arc, enters the molten pool 8, and forms a welding seam on the workpiece 6 to be processed after solidification.

The multi-source coaxial plasma arc cladding equipment and the cladding process adopt the plasma arc generating component to emit multiple paths of plasma arcs which converge from different directions to one point, so as to form a main arc, and filler 7 (such as metal wire or powder) is fed into the main arc from the center of the multiple paths of plasma arcs and enters a molten pool after being melted. Compared with the traditional single-arc technology, the embodiment adopts a multi-arc convergence mode, so that the power of the arc emitted by each conductive nozzle 22 can be greatly reduced when the power required by cladding is the same, and the equipment cost can be effectively reduced; compared with a single electric arc, the main arc formed by converging a plurality of electric arcs has the advantages that the power density distribution is more dispersed, the molten pool 8 is shallower, and the main arc is more suitable for additive manufacturing or surface cladding. Meanwhile, compared with the traditional side-axis wire feeding mode (the filler 7 is a metal wire), the wire is fed from the center of the plasma arc, and the adverse effect of the side-axis wire feeding direction on the stacking process and the quality is eliminated; similarly, compared with the conventional method of feeding powder from the periphery to the plasma arc (the filler 7 is metal powder), the powder of this embodiment is fed directly to the center of the plasma arc, and the powder can be melted more fully. Compared with the existing plasma arc cladding equipment, the multi-source coaxial plasma arc cladding equipment and the cladding process have the advantages that the power distribution is smoother, the weld depth is small, the weld width is large, the equipment is more suitable for surface cladding and additive manufacturing, the quality of the weld can be improved, and the processing efficiency can be improved.

Specifically, the lower gun body is made of conductive metal.

Specifically, the electric cable 5 includes an anode electric cable 51 and a cathode electric cable 52, the workpiece 6 to be processed is connected with the anode of the power supply mechanism 1 through the anode electric cable 51, the lower gun body is connected with the anode of the arc striking circuit of the power supply mechanism 1 through the anode electric cable 51, the cathode rod 23 is connected with the cathode of the power supply mechanism 1 through the cathode electric cable 52, the cathode rod 23 is set as a tungsten electrode, that is, the plasma arc generating component is a plasma arc generating component of an emission transfer type plasma arc.

The types of plasma arcs are classified into three types, i.e., a non-transfer type plasma arc, a transfer type plasma arc and a combination type plasma arc, according to the power supply mode of a power supply, wherein an electric arc of the non-transfer type plasma arc is established between a tungsten electrode and the conductive nozzle 22, and the plasma arc is forced to be ejected from a small hole on the conductive nozzle 22 by ionic gas. An arc of a transfer plasma arc is established between the tungsten electrode and the workpiece 6 to be treated. The union type is the simultaneous existence of the above two arc types. The plasma arc of the present embodiment is a transfer type plasma arc. In the non-transfer plasma arc circuit connection mode, the tungsten electrode is connected with the negative electrode of the power supply, the conductive nozzle 22 is connected with the positive electrode, and an electric arc is generated between the tungsten electrode and the conductive nozzle in the working state; in the transfer plasma arc circuit connection mode, a tungsten electrode is usually connected with a negative electrode of a power supply mechanism 1, a workpiece 6 to be processed is connected with a positive electrode of the power supply mechanism 1 through a cable 5, when special materials are welded, the circuit can be reversely connected or an alternating current mode is adopted, but plasma arc is always generated between the tungsten electrode and the workpiece 6 to be processed.

Specifically, the power supply mechanism 1 includes a multi-channel power supply 11, the multi-channel power supply 11 includes a plurality of output paths that are provided in one-to-one correspondence with the plurality of cathode bars 23, and the cathode bars 23 and the conductive nozzles 22 are connected with the output paths corresponding thereto through cables 5. The multi-channel power supply 11 is composed of a plurality of parallel power supply modules which are combined together and connected with the welding gun mechanism 2 through a cable 5, and the workpiece 6 to be processed is connected with the multi-channel power supply 11 through the cable 5.

Specifically, the positive electrode of each output channel of the multi-channel power supply 11 is connected to the corresponding conductive nozzle 22 through an anode cable 51 (arc striking circuit anode cable), and the negative electrode of each output channel of the multi-channel power supply 11 is connected to the corresponding tungsten electrode through a cathode cable 52.

The principle of the single plasma arc generating component of the present embodiment for generating the transferred plasma arc is not substantially changed from the existing device, and the difference from the existing device is that in order to achieve the simultaneous output of multiple channels, the present embodiment adopts the multi-channel power supply 11 formed by optimally combining multiple power supply modules, the multi-channel power supply 11 has multiple identical power supply paths (power supply modules), and the equal output voltage and current of each channel can be achieved through a shunt, so that the plasma arc with equal emission power of each conductive nozzle 22 is achieved.

Specifically, the multi-channel power supply 11 is connected to the mains supply through a power plug 12.

Specifically, the ion gas flow channel 21 is provided with an ion gas inlet 211, the ion gas inlet 211 is connected to the ion gas supply device 4 through an ion gas flow channel 41, and each of the ion gas flow channels 41 connecting the ion gas supply device 4 and the ion gas flow channel 21 is provided with a gas flow meter. Each of the ion gas flow channels 41 connecting the ion gas supply device 4 and the ion gas flow channel 21 is provided with a flow meter to monitor and control to ensure that the ion gas flow of each channel is equal.

Specifically, the ion gas supply device 4 includes an ion gas supply bottle, an air flow diverter, and an ion gas manifold connecting the ion gas supply bottle and the air flow diverter, the air flow diverter connects the air flow manifold and a plurality of the air flow pipes 41. The gas in the ion gas supply bottle can be high-purity argon.

Specifically, the welding gun mechanism 2 is mounted on a moving mechanism (such as a robot or a machine tool). The welding gun mechanism 2 is driven to move by the movement mechanism, and welding, surface cladding or additive manufacturing are realized on different movement paths.

Specifically, the multi-source coaxial plasma arc cladding equipment further comprises a water cooling device 9 for supplying cooling liquid to the welding gun mechanism 2, and a shielding gas supply device 10 for supplying shielding gas to the welding gun mechanism 2; the welding gun mechanism 2 comprises a water-cooling heat exchange component for heat dissipation of a plasma arc generation component and a shielding gas flow channel 25 for providing shielding gas for a plurality of plasma arc generation components, wherein a gas inlet 251 of the shielding gas flow channel 25 is connected with the shielding gas supply device 10 through a shielding gas flow pipeline 101, and the water-cooling heat exchange component is connected with the water-cooling device 9.

Specifically, the shielding gas supply device 10 includes a shielding gas supply bottle, and a shielding gas manifold connecting the shielding gas supply bottle and the shielding gas flow passage 25. The shielding gas in the shielding gas supply bottle can be argon.

Specifically, the water-cooling heat exchange part is including locating the internal coolant liquid cavity 26 of rifle down, inlet 261 and liquid outlet 262 have been seted up on coolant liquid cavity 26 upper portion, inlet 261 and liquid outlet 262 are connected through coolant liquid outlet pipe 91 and coolant liquid wet return 92 respectively water cooling plant 9.

Specifically, the water cooling device 9 is a water cooling machine with an infusion pump, and the liquid inlet 261 and the liquid outlet 262 are both provided in plurality.

Specifically, the plurality of ion gas flow channels 21 of the lower gun body penetrate through the cooling liquid chamber 26, the ion gas flow channels 21 are connected with the outer wall of the cooling liquid chamber 26 in a sealing manner, the feeding guide nozzle 24 penetrates through the cooling liquid chamber 26, the feeding guide nozzle 24 is connected with the outer wall of the cooling liquid chamber 26 in a sealing manner, and the discharge port of the feeding guide nozzle 24 and the injection port of the conductive nozzle 22 are both arranged outside the cooling liquid chamber 26. The cooling water is pumped out from the water cooling device 9, enters the cooling liquid chamber 26 through the cooling water outlet pipe 91 to cool the plasma arc generating components, and the cooling water flowing through the cooling liquid chamber 26 flows back into the cooling apparatus 9 through the cooling liquid return pipe 92.

Specifically, the welding gun mechanism 2 includes a shielding gas nozzle 27, the cooling liquid chamber 26 is fixedly installed at the center of the shielding gas nozzle 27, a lower port 271 capable of emitting shielding gas and plasma arc is opened at the bottom of the shielding gas nozzle 27, the shielding gas flow channel 25 is formed between the inner wall of the shielding gas nozzle 27 and the outer wall of the cooling liquid chamber 26, the gas inlet 251 of the shielding gas nozzle 27 is arranged at the upper part thereof, and the shielding gas supply device 10 is connected to the gas inlet 251 through a shielding gas flow pipeline 101.

Specifically, the plurality of discharge ports of the conductive nozzle 22 of the lower gun body are combined to form a main arc discharge portion, and the main arc discharge portion is located in the center of the lower port of the shield gas nozzle.

The discharge ports of the plurality of conductive nozzles 22 of the plasma arc generating component are combined to form a main arc discharge portion, and the main arc discharge portion is positioned at the center of the lower port 271 of the shield gas nozzle 27.

Specifically, the included angle α between the central axis of the jet orifice of the conductive nozzle 22 (i.e., the central axis of the cathode bar 23) and the central axis of the discharge port of the feeding guide nozzle 24 is 0 ° < α ≦ 60 °. The included angle between the jet orifice of the conductive nozzle 22 and the central axis of the discharge hole of the feeding guide nozzle 24 is within the range, so that plasma arcs emitted by the conductive nozzles 22 can be ensured to be superposed at one point on the central axis of the discharge hole of the feeding guide nozzle 24 to form a stable main arc, and the cladding effect is ensured.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.