Ingot casting device suitable for recycling waste metal

Abstract

The invention relates to the technical field of waste metal regeneration equipment, in particular to an ingot casting device suitable for waste metal recycling, which comprises a crucible, a vacuum pump and a high-frequency heater, a recycling box is arranged on one side of the crucible, and a flushing mechanism and a decontamination spray gun are sequentially arranged in the recycling box from left to right; the method is used for flushing sludge on the surface of the waste metal and removing grease on the surface. Through rotation of the flushing cylinder, the metal parts in the flushing cylinder roll, are thrown upwards and fall down and do circulating motion, sludge is vibrated off, the metal parts are flushed cleanly, and pretreatment is completed; a decontamination spray gun capable of emitting plasma jet flow in a normal-pressure and low-temperature environment is arranged above a waste metal conveying path, a pulse power supply is adopted for exciting gas ionization in a short time, the plasma jet flow is generated, the jet flow is directionally sprayed to the surface of the waste metal to decompose oil stains, and the low-cost, efficient and environment-friendly decontamination effect is achieved; and the quality of the waste metal piece cast ingot is directly improved.

Description

Technical Field

[0001] This invention relates to the field of waste metal recycling equipment technology, specifically to an ingot casting device suitable for the recycling of waste metals. Background Technology

[0002] Chinese Patent Application No. CN202021578176.2 discloses a cooling device for processing scrap metal ingots, including a cooler, a storage port, and an isolation plate. The storage ports are located at one end of the cooler and are connected to it. The isolation plate is located at one end of the cooler and is fixedly connected to it. An auxiliary support plate is provided at the lower end of one side of the isolation plate, and the auxiliary support plate is fixedly connected to the isolation plate by screws. Connecting rods are evenly distributed on one side of the auxiliary support plate. Through structural improvements, this device can conveniently remove the ingot liquid condensed at the bottom of the cooling tank during actual use, preventing the condensed ingot liquid from mixing with other liquids later and ensuring the purity of the ingot liquid.

[0003] Since scrap metal often contains oil, coatings, or other contaminants, if these are not properly treated before ingot smelting, they may affect the subsequent smelting efficiency and the quality of the metal ingots. In addition, traditional chemical cleaning leaves behind pollution residues and generates harmful gases during the smelting of scrap metal parts, which can damage the working environment. Therefore, reducing pollution during smelting is an urgent and imperative issue. Summary of the Invention

[0004] In order to overcome the deficiencies in the prior art, the present invention aims to provide an ingot casting device suitable for the recycling of waste metals, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides an ingot casting device suitable for the recycling of scrap metal, comprising a crucible, a vacuum pump and a high-frequency heater. A recycling box is provided on one side of the crucible. The inside of the recycling box is provided with a rinsing mechanism and a decontamination spray gun from left to right for rinsing the sludge on the surface of the scrap metal and removing its surface grease. A conveyor belt for transporting the scrap metal to the crucible is provided at the bottom of the recycling box.

[0006] The rinsing mechanism includes a rinsing cylinder located above the left end of the conveyor belt, a rinsing pipe coaxially inserted with the rinsing cylinder, and a cylinder cover snapped onto the outer wall of the rinsing cylinder; the outer wall of the rinsing cylinder is provided with a plurality of spray holes at equal intervals, and a servo motor is provided at the rear end of the rinsing pipe.

[0007] The top surface of the recycling bin is provided with several decontamination ports. The decontamination spray gun is inserted and connected to the decontamination ports. The decontamination spray gun consists of a gun body, a high-voltage electrode and an insulating dielectric layer embedded at the nozzle end of the gun body, and a gas nozzle. The insulating dielectric layer is located between the high-voltage electrodes. The high-voltage electrodes are serrated electrode plates. A pulse power supply is used to briefly excite the gas to ionize and generate a plasma jet. The jet is directionally sprayed onto the surface of the waste metal to decompose the oil stains.

[0008] As a further improvement to this technical solution, a cleaning box is connected to the top left end of the recycling box, and the two ends of the rinsing pipe are embedded in the front and back of the cleaning box. The top surface of the cleaning box is open, and a sewage outlet is connected to the bottom surface of the recycling box. A discharge port is opened at the right end of the recycling box, and a feed port is opened on the left side wall of the crucible. A sealing plate is rotatably connected to the bottom of the feed port, and the sealing plate is opened and rotated into the discharge port, and is located at an inclination below the right end of the conveyor belt.

[0009] As a further improvement to this technical solution, the outer side of the rinsing cylinder is provided with a cylinder opening that engages with the cylinder cover, the outer surface of the rinsing cylinder is fitted with a perforated plate, and the outer surface of the cylinder cover is fitted with a cylinder cover mesh.

[0010] As a further improvement to this technical solution, the rear end side wall of the cylinder opening is symmetrically provided with a slot, the front end side wall of the cylinder opening is symmetrically provided with an insertion hole, the rear two side walls of the cylinder cover are symmetrically provided with a card, the card engages with the slot, and the front two sides of the cylinder cover are provided with a limiting pin that engages with the insertion hole.

[0011] As a further improvement to this technical solution, grooves are provided on both sides of the front end of the cylinder cover, and through holes are provided on the side wall of the cylinder cover in the grooves. The limiting pin is inserted into the through hole, and a spring is embedded in the inner end of the limiting pin.

[0012] As a further improvement to this technical solution, the insulating dielectric layer is made of ceramic or quartz, which is used to limit the current and generate uniform micro-discharge. A gas cylinder for introducing inert gas into the gas nozzle is provided on the rear side of the recycling box.

[0013] As a further improvement to this technical solution, a gas cylinder for introducing oxygen into the gas nozzle is provided on the rear side of the recovery box, and the volume ratio of oxygen to inert gas is 1:20.

[0014] As a further improvement to this technical solution, the surface of the high-voltage electrode is coated with a corrosion-resistant layer, and the pulse width of the pulse power supply is <100ns, with a frequency adjustment range of 10-100kHz.

[0015] As a further improvement to this technical solution, a conveyor motor is coaxially connected to the central shaft of one end of the conveyor belt, the servo motor is installed at the rear of the cleaning tank, the output shaft end of the servo motor is fitted with a drive gear, and the rear end of the rinsing pipe is fitted with a transmission gear that meshes with the drive gear.

[0016] As a further improvement to this technical solution, guide plates are symmetrically arranged on the bottom sidewall of the cleaning tank. The guide plates are inclined downwards. Several pairs of rollers are inserted between the front and rear walls of the cleaning tank. The rollers are in rolling contact with the bottom of the rinsing cylinder.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This ingot casting device, applicable to the recycling of scrap metal, uses a set flushing mechanism to start a servo motor to drive the flushing pipe and flushing cylinder to rotate synchronously. This causes the metal parts inside the flushing cylinder to roll, be thrown up and down in a cyclical motion, shaking off the sludge and being cleaned by the rapid water flow sprayed from the flushing pipe. This achieves the effect of pre-cleaning large residues on the surface, directly improving the quality of scrap metal ingot casting.

[0019] 2. This ingot casting device, applicable to the recycling of scrap metal, is equipped with a decontamination spray gun that emits plasma jets under normal pressure and low temperature conditions above the scrap metal conveying path. It uses a pulse power supply to briefly excite gas ionization to generate a plasma jet, which is then directionally sprayed onto the surface of the scrap metal to decompose oil stains. This achieves a low-cost, high-efficiency, and environmentally friendly decontamination effect, directly improving the quality of scrap metal ingots. Attached Figure Description

[0020] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, will select various possible shapes and proportions to implement the invention according to specific circumstances.

[0021] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall internal assembly structure of the present invention;

[0023] Figure 3 This is an exploded view of the crucible assembly of the present invention;

[0024] Figure 4 For the present invention Figure 2 The main view;

[0025] Figure 5This is a schematic diagram of the internal assembly structure of the recycling bin of the present invention;

[0026] Figure 6 This is an assembly disassembly diagram of the rinsing mechanism of the present invention;

[0027] Figure 7 This is an exploded view of the cap of the present invention;

[0028] The meanings of the labels in the diagram are as follows:

[0029] 100. Crucible; 110. Vacuum pump; 120. High-frequency heater; 121. Feed inlet; 122. Sealing plate; 130. Casting bucket; 140. Casting module;

[0030] 200. Recycling bin; 201. Washing bin; 202. Drain outlet; 203. Discharge outlet; 204. Decontamination outlet; 205. Guide plate; 210. Washing mechanism; 211. Washing cylinder; 2111. Cylinder opening; 2112. Slot; 2113. Insertion hole; 2114. Mesh plate; 212. Cylinder cover; 2121. Card; 2122. Groove; 2123. Perforation; 2124. Limit pin; 2125. Spring; 213. Washing pipe; 2131. Spray nozzle; 2132. Transmission gear; 214. Servo motor; 2141. Drive gear; 215. Idler roller; 216. Cylinder cover mesh;

[0031] 220. Decontamination spray gun; 230. Conveyor belt; 231. Conveyor motor. Detailed Implementation

[0032] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art will conceive of any possible variations of the invention, all of which should be considered within the scope of the invention. The terms "installation" and "connection" should be interpreted broadly, referring to direct connection as well as indirect connection through an intermediate medium.

[0033] The terms "central axis," "vertical," "horizontal," "front," "rear," "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of the invention, "a number" means two or more, unless otherwise explicitly specified.

[0034] Please see Figures 1-7 As shown, this invention provides an ingot casting device suitable for the recycling of waste metals, including a crucible 100, a vacuum pump 110, and a high-frequency heater 120. A lid is bolted to the top of the crucible 100, and the vacuum pump 110 is mounted on top of the lid. A pressure gauge is also installed on the top of the lid. The high-frequency heater 120 consists of a high-frequency generator and an induction coil. The high-frequency generator produces a high-frequency current, which passes through an output transformer and is transmitted from the induction coil to the surface of the metal part inside the crucible 100. When the high-frequency current passes through the induction coil, a strong magnetic field is generated around it. When the metal part is placed in the magnetic field generated by the induction coil, eddy currents are generated on the surface of the metal part. As these eddy currents flow inside the metal part, they encounter resistance, thus generating heat. This heat raises the temperature of the metal part, thereby achieving the purpose of heating and melting. Since the eddy current is generated inside the metal part, the high-frequency heater 120 can achieve a rapid and uniform heating effect. A control valve is installed at the bottom outlet of the crucible 100. A casting barrel 130 is rotatably connected to the bottom of the crucible 100. A casting module 140 is placed in front of the bottom of the casting barrel 130. A hydraulic pump is installed at the rear of the casting barrel 130 to lift the casting barrel 130 and pour the molten metal inside into the casting module 140 to complete the ingot casting. The above is the prior art and will not be described in detail here.

[0035] Since the recycled scrap metal consists of scrapped vehicles and other industrial products, the surface of the metal parts is covered with grease and oil. A recycling box 200 is provided on one side of the crucible 100. Inside the recycling box 200, from left to right, there are a rinsing mechanism 210 and a decontamination spray gun 220, which are used to rinse the sludge on the surface of the scrap metal and remove the grease. A conveyor belt 230 is provided at the bottom of the recycling box 200 to transport the scrap metal to the crucible 100.

[0036] Specifically, the rinsing mechanism 210 includes a rinsing cylinder 211 located above the left end of the conveyor belt 230, a rinsing pipe 213 coaxially connected to the rinsing cylinder 211, and a cylinder cover 212 snapped onto the outer wall of the rinsing cylinder 211. The outer wall of the rinsing cylinder 211 is provided with several spray holes 2131 at equal intervals. The spray holes 2131 are Laval holes with the small diameter end located on the outer wall of the rinsing cylinder 211, which increases the speed of the sprayed water to form an impact force so as to wash away the sludge. A servo motor 214 is provided at the rear end of the rinsing pipe 213. When the servo motor 214 is started, it drives the rinsing pipe 213 and the rinsing cylinder 211 to rotate synchronously, so that the metal parts inside the rinsing cylinder 211 roll, throw up and fall in a cyclical motion, thereby shaking off the sludge and washing it clean by the fast water flow sprayed from the rinsing pipe 213.

[0037] The top left end of the recycling box 200 is connected to the cleaning box 201. The two ends of the rinsing pipe 213 are embedded in the front and back of the cleaning box 201. The top surface of the cleaning box 201 is open. The bottom surface of the recycling box 200 is connected to the drain outlet 202. The right side of the recycling box 200 is provided with the discharge outlet 203. The left side wall of the crucible 100 is provided with the inlet 121. The bottom of the inlet 121 is rotatably connected to the sealing plate 122. The sealing plate 122 is opened and rotated into the discharge outlet 203. It is located at the right end of the conveyor belt 230 and is inclined. The sealing plate 122 is used to catch the metal parts and lead them into the crucible 100. A stepper motor is installed on the rotating shaft end of the sealing plate 122 to control the sealing plate 122 to flip open and reset to close the inlet 121.

[0038] Furthermore, the outer side of the rinsing tube 211 has a tube opening 2111 that engages with the tube cover 212, allowing metal parts to be poured in; a mesh plate 2114 is installed on the outer surface of the rinsing tube 211, and a tube cover mesh 216 is installed on the outer surface of the tube cover 212, so that wastewater can be discharged when rinsing the metal parts; symmetrical slots 2112 are provided on the rear side wall of the tube opening 2111, symmetrical insertion holes 2113 are provided on the front side wall of the tube opening 2111, and symmetrical clips are provided on the rear side walls of the tube cover 212. 2121, the card 2121 engages with the card slot 2112, and the front ends of the cover 212 are fitted with limiting pins 2124 that engage with the insertion holes 2113; first, the cover 212 is misaligned and inserted into the opening 2111, then the cover 212 is slid to make the card 2121 engage with the card slot 2112, and then the limiting pins 2124 are moved to insert into the insertion holes 2113, so that the cover 212 and the rinsing tube 211 are connected as a whole, so that the metal parts do not fall off when the rinsing tube 211 is turned over.

[0039] Furthermore, grooves 2122 are provided on both sides of the front end of the tube cover 212, and through holes 2123 are provided on the side wall of the tube cover 212. The limiting pin 2124 is inserted into the through hole 2123, and a spring 2125 is embedded in the inner end of the limiting pin 2124. The spring 2125 keeps pressing the limiting pin 2124 into the insertion hole 2113 to prevent the tube cover 212 from being thrown off when the washing tube 211 rotates.

[0040] Furthermore, a conveyor motor 231 is coaxially connected to the central shaft of one end of the conveyor belt 230. The conveyor motor 231 is fixedly connected to the rear of the recycling box 200 by bolts. The servo motor 214 is fixedly connected to the plate behind the cleaning box 201 by bolts. The output shaft end of the servo motor 214 is fitted with a drive gear 2141. The rear end of the flushing pipe 213 is fitted with a transmission gear 2132 that meshes with the drive gear 2141, thereby driving the flushing pipe 213 to rotate and spray water.

[0041] Furthermore, guide plates 205 are symmetrically arranged on the bottom side wall of the cleaning box 201. The guide plates 205 are inclined downwards to guide the metal parts onto the inverted conveyor belt 230. Several pairs of idlers 215 are inserted between the front and rear walls of the cleaning box 201. The idlers 215 roll in contact with the bottom of the rinsing cylinder 211 to increase the support force of the rinsing cylinder 211 and reduce the load pressure on the rinsing pipe 213.

[0042] Furthermore, at atmospheric pressure of 1 atm, the high density of gas molecules leads to a dramatic increase in the collision frequency between electrons and neutral particles, making it difficult to maintain stable plasma and prone to transitioning into arc discharge. To achieve atmospheric pressure low-temperature plasma, the following methods are needed: adding an insulating medium between the two electrodes to limit the current and generate uniform micro-discharge; using a high-speed helium gas flow to carry ionized particles to form a directional plasma beam; and using short-duration high-voltage pulses to reduce heat accumulation and suppress arc formation.

[0043] Specifically, the top surface of the recycling bin 200 has several decontamination ports 204. A decontamination spray gun 220 is inserted into each decontamination port 204. The decontamination spray gun 220 consists of a gun body, a high-voltage electrode embedded in the nozzle end of the gun body, an insulating dielectric layer, and a gas nozzle. The insulating dielectric layer is located between the high-voltage electrodes, which are serrated electrode plates to enhance the uniformity of the electric field distribution. A pulsed power supply is used to briefly excite the gas ionization, generating a plasma jet. This jet is directionally sprayed onto the surface of the waste metal to decompose oil stains. The surface of the high-voltage electrodes is coated with a corrosion-resistant layer, such as a tungsten coating, to extend electrode life. The pulse width of the pulsed power supply is <100ns to suppress thermal effects, and the frequency adjustment range is 10-100kHz to match different gas ionization requirements.

[0044] The insulating dielectric layer is made of ceramic or quartz, such as Al2O3, to reduce energy loss, limit current, and generate uniform micro-discharge. A gas cylinder for introducing inert gas into the gas nozzle is provided on the rear side of the recovery box 200.

[0045] Furthermore, the rear side of the recovery box 200 is equipped with a gas cylinder for introducing oxygen into the gas nozzle, and the volume ratio of oxygen to inert gas is 1:20; cheap nitrogen is used as the main gas source, mixed with a small amount of oxygen to enhance the oxidation capacity.

[0046] Cost comparison

[0047] project Atmospheric pressure plasma mechanism Vacuum plasma equipment Equipment investment Low (no vacuum system) High (vacuum chamber / pump assembly) Operating costs (Gas / Electricity Costs) High (vacuum pump energy consumption) Maintenance costs Low (modular replacement) High (vacuum seal maintenance)

[0048] Atmospheric pressure low-temperature plasma technology is expected to achieve a low-cost, high-efficiency, and environmentally friendly breakthrough in the field of waste metal pretreatment, and promote the upgrading of the recycled metal industry to green manufacturing.

[0049] Application Scenarios and Promotion

[0050] High-value-added metal recycling: precision cleaning of aerospace aluminum and electronic copper;

[0051] Automotive dismantling industry: Removing paint and adhesives from metal parts of scrapped vehicles;

[0052] Small and medium-sized recycling enterprises: low-cost, mobile equipment suitable for decentralized operations.

[0053] This invention relates to an ingot casting device for the recycling of waste metals. During ingot casting, the waste metal parts are first placed upside down in the rinsing cylinder 211, piling up to more than half full. The cylinder cover 212 is then placed over the cylinder opening 2111 to seal it. A mixture of clean water and detergent is then introduced into the front end of the rinsing pipe 213. Simultaneously, a servo motor 214 is started to drive the rinsing cylinder 211 to rotate and circulate the material for rinsing, thus removing the sludge from the surface of the metal parts. After cleaning, the cylinder cover 212 is opened, and the servo motor 214 is started at low speed to drive the rinsing cylinder 211 to rotate and unload the material. At the same time, a conveyor motor 231 is started to drive the conveyor belt 230 to transport the metal parts to the sealing plate 122 and slide them into the crucible 100. During this process, several decontamination spray guns 220 are activated, and a 1:20 mixture of oxygen and inert gas is introduced. Simultaneously, a pulse power supply is used to briefly ionize the gas, generating a plasma jet. The jet is directed and sprayed onto the surface of the waste metal to decompose the oil stains. At a normal pressure of 1 atm, low-temperature plasma is achieved, resulting in a low-cost, efficient, and environmentally friendly decontamination effect.

[0054] After the metal parts are cleaned, they are placed into the crucible 100. The vacuum pump 110 is activated to create a vacuum environment. The high-frequency heater 120 is powered on, generating a high-frequency current that passes through the output transformer and is transmitted from the induction coil to the surface of the metal parts inside the crucible 100. When the high-frequency current passes through the induction coil, a strong magnetic field is generated around it. When the metal parts are placed in the magnetic field generated by the induction coil, eddy currents are generated on the surface of the metal parts. As the eddy currents flow inside the metal parts, they encounter resistance, thereby generating heat. This heat raises the temperature of the metal parts, thus achieving the purpose of heating and melting. The valve is then opened to pour the molten liquid into the casting module 140 to form an ingot.

[0055] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A casting device suitable for recycling scrap metal, comprising a crucible (100), a vacuum pump (110), and a high-frequency heater (120), characterized in that: A recycling bin (200) is provided on one side of the crucible (100). Inside the recycling bin (200), from left to right, there is a rinsing mechanism (210) and a decontamination spray gun (220) for rinsing the sludge on the surface of the scrap metal and removing the grease from its surface. A conveyor belt (230) for transporting the scrap metal to the crucible (100) is provided at the bottom of the recycling bin (200). The rinsing mechanism (210) includes a rinsing cylinder (211) disposed above the left end of the conveyor belt (230), a rinsing pipe (213) coaxially inserted with the rinsing cylinder (211), and a cylinder cover (212) snapped onto the outer wall of the rinsing cylinder (211); the outer wall of the rinsing cylinder (211) is provided with a plurality of spray holes (2131) at equal intervals, and a servo motor (214) is provided at the rear end of the rinsing pipe (213). The top surface of the recycling bin (200) is provided with several decontamination ports (204). The decontamination spray gun (220) is inserted and connected to the decontamination ports (204). The decontamination spray gun (220) consists of a gun body, a high-voltage electrode and an insulating dielectric layer embedded at the nozzle end of the gun body, and a gas nozzle. The insulating dielectric layer is located between the high-voltage electrodes. The high-voltage electrodes are serrated electrode plates. The gas is ionized by a pulse power supply for a short time to generate a plasma jet. The jet is directionally sprayed onto the surface of the waste metal to decompose the oil stains.

2. The ingot casting device for recycling scrap metal according to claim 1, characterized in that: The top left end of the recycling box (200) is connected to a cleaning box (201). The two ends of the flushing pipe (213) are embedded in the front and back of the cleaning box (201). The top surface of the cleaning box (201) is open. The bottom surface of the recycling box (200) is connected to a drain outlet (202). The right side of the recycling box (200) is provided with a discharge outlet (203). The left side wall of the crucible (100) is provided with a feed inlet (121). The bottom of the feed inlet (121) is rotatably connected to a sealing plate (122). The sealing plate (122) is opened and rotated into the discharge outlet (203), and is located below the right end of the conveyor belt (230) at an incline.

3. The ingot casting device for recycling scrap metal according to claim 2, characterized in that: The outer side of the rinsing tube (211) is provided with a tube opening (2111) that engages with the tube cover (212). A mesh plate (2114) is installed on the outer surface of the rinsing tube (211), and a tube cover mesh (216) is installed on the outer surface of the tube cover (212).

4. The ingot casting device for recycling scrap metal according to claim 3, characterized in that: The cylindrical opening (2111) has symmetrical slots (2112) on the rear side wall, and symmetrical insertion holes (2113) on the front side wall. The cylindrical cover (212) has symmetrical cards (2121) on both rear side walls. The cards (2121) engage with the slots (2112). The cylindrical cover (212) has limiting pins (2124) embedded on both front sides that engage with the insertion holes (2113).

5. The ingot casting device for recycling scrap metal according to claim 4, characterized in that: The front end of the cylinder cover (212) is provided with grooves (2122) on both sides, and the grooves (2122) are provided with through holes (2123) facing the side wall of the cylinder cover (212). The limiting pin (2124) is inserted into the through hole (2123), and the inner end of the limiting pin (2124) is provided with a spring (2125).

6. The ingot casting device for recycling scrap metal according to claim 5, characterized in that: The insulating dielectric layer is made of ceramic or quartz and is used to limit the current and generate uniform micro-discharge. The rear side of the recovery box (200) is provided with a gas cylinder for introducing inert gas into the gas nozzle.

7. The ingot casting device for recycling scrap metal according to claim 6, characterized in that: The rear side of the recycling bin (200) is provided with a gas cylinder for introducing oxygen into the gas nozzle, and the volume ratio of oxygen to inert gas is 1:

20.

8. The ingot casting device for recycling scrap metal according to claim 7, characterized in that: The surface of the high-voltage electrode is coated with a corrosion-resistant layer, and the pulse width of the pulse power supply is <100ns, with a frequency adjustment range of 10-100kHz.

9. The ingot casting device for recycling scrap metal according to claim 8, characterized in that: The conveyor belt (230) is coaxially connected to a conveyor motor (231) at one end of its central shaft. The servo motor (214) is installed behind the cleaning tank (201). The output shaft of the servo motor (214) is fitted with a drive gear (2141). The rear end of the flushing pipe (213) is fitted with a transmission gear (2132) that meshes with the drive gear (2141).

10. The ingot casting device for recycling scrap metal according to claim 9, characterized in that: The bottom sidewall of the cleaning tank (201) is symmetrically provided with guide plates (205), which are inclined downwards. Several pairs of idlers (215) are inserted between the front and rear walls of the cleaning tank (201), and the idlers (215) are in rolling contact with the bottom of the rinsing cylinder (211).

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