607results about "Electric discharge heating" patented technology

The invention discloses a yellow phosphorus furnace electrode paste and a preparation method thereof, and belongs to the technical field of yellow phosphorus furnace production, the yellow phosphorus furnace electrode paste comprises the following raw materials by mass: 55-65% of anthracite particles, 20-25% of petroleum coke, 5-10% of graphite chips, 18-25% of a composite binder, 0.3-1.5% of a composite antioxidant and 1.5-4.5% of an additive; the yellow phosphorus furnace electrode paste provided by the invention is produced according to the preparation method provided by the invention, and the resistivity, compressive strength and oxidation resistance can be synchronously improved through the design of carbon material multistage particle size distribution, a nano-reinforced composite binder and a synergistic anti-oxidation system in combination with an efficient drying and densification process; the problem that an existing electrode paste is poor in density and performance is effectively solved.

The invention relates to a multi-electrode direct-current electric arc furnace, a submerged arc furnace power supply device and a smelting method, belongs to the technical field of industrial smelting, and aims to solve the problem of working condition of abnormal conductivity of furnace charge of the multi-electrode direct-current furnace. The device is composed of a phase-shifting transformer, a rectification module, a direct current conversion module, an isolation switch and other components, and all the components are connected according to a specific rule, so that a top electrode attribute conversion loop is formed in the device topology. By matching with the smelting method, cathode and anode attribute transformation of the multi-electrode direct current furnace top electrode can be realized, smelting can be performed through a top electrode loop under complex conditions of poor furnace charge conductivity and the like, and a normal production process can be recovered after a molten pool in the furnace appears and the furnace charge conductivity is enhanced, so that the abnormal fault processing time is shortened, and the production efficiency is improved. And the smelting efficiency of industrial smelting, especially in the fields of iron alloys and special steel, is improved.

The invention discloses a high-power sliding arc igniter based on a gas-liquid cooling electrode and an operation method of the high-power sliding arc igniter, and relates to the field of high-end equipment, a high-voltage electrode is located at the tail end of an inner-layer sleeve, and insulation between the high-voltage electrode and a low-voltage electrode is achieved through a first cyclone and an insulation interface. Sliding arc discharge is generated by the high-voltage electrode and the low-voltage electrode, a rotary sliding arc is formed under the action of strong rotational flow, and large-area discharge is generated; meanwhile, liquid ammonia is introduced into the high-voltage electrode and the low-voltage electrode, the surface temperature of the electrodes is reduced, the service life of the electrodes is prolonged and higher discharge power is allowed in the liquid ammonia gasification heat absorption process, and gasified ammonia is sprayed out through small-diameter holes and mixed with sliding arc plasmas to form flames. The defects that a high-power sliding arc electrode is high in temperature, short in service life and the like are overcome, and the sliding arc power, the electrode service life and the ignition performance can be greatly improved within the limited size.

A furnace vessel of an arc furnace is loaded with solid metal. Afterward, an energy supply device of the arc furnace feeds electrical energy to electrodes of the arc furnace via a furnace transformer to form arcs between the electrodes and the metal, the arcs melting the metal. Finally, the molten metal is removed from the furnace vessel. The number of electrodes is at least three. For at least two of the electrodes, the energy supply device individually sets the operating frequency (fa, fb) of the relevant electrode. The current (Ic) through the third electrode is defined by the current (Ia, Ib) through the first and the second electrodes. Which of the electrode is the first electrode, which is the second electrode, and which is the third electrode is assigned dynamically.

The invention discloses an iron alloy electrode paste and a preparation process, and belongs to the technical field of electrode paste preparation, the iron alloy electrode paste comprises a composite aggregate system and a composite binder system, the composite aggregate system comprises the following components by mass: 40-60% of anthracite aggregate, 15-25% of artificial graphite flake, and 3-8% of silicon carbide whisker; the composite binder system comprises the following components in percentage by mass: 70-80% of medium-temperature modified coal pitch, 10-15% of furan resin and 5-10% of dispersion liquid containing nano boron carbide, and the composite binder system is combined with the composite aggregate system through a gradient permeation process to form a three-dimensional conductive network and an enhanced interface; the composite aggregate system and the composite binder system are optimally proportioned, and gradient permeation and gradient kneading processes are combined, so that the comprehensive performance of the electrode paste is remarkably improved, the thermal shock resistance is greatly improved and the linear shrinkage rate is reduced while low resistivity is maintained, the electrode paste is suitable for smelting ferroalloys such as silicomanganese and ferrochromium, and the service life is remarkably prolonged.

The invention discloses a furnace end uniform in heating. The furnace end comprises a top plate, a bottom plate and a plurality of plasma combustors. A furnace chamber is defined by the top plate and the bottom plate. Due to the fact that the air inlet holes are formed in the radial direction, the position and size precision of the air inlet holes can be guaranteed by adopting a machine to pre-embed the needles and pull the needles, manual intervention is not needed, the labor cost is reduced, gas can directly impact the anode needles and take away part of heat generated by the anode needles, and a certain cooling effect on the anode needles is achieved; the electric arc generated between the anode needle and the cathode pintle is maintained in the axis space, so that direct interference or influence of airflow on the electric arc in the area is avoided; by arranging the cathode pintle, the plasma jet impacts the head of the cathode pintle and then is sprayed out in the radial direction, the energy of the plasma jet is dispersed in a larger range, the concentration ratio and the energy density of the jet are reduced, the phenomenon of local overheating is avoided, and uniform heating of cookware is achieved.

The invention discloses a graphite electrode cooling device of a graphitization furnace, the graphitization furnace and a cooling method, and relates to the technical field of graphite electrode cooling, the graphite electrode cooling device of the graphitization furnace comprises a cooling mechanism, the cooling mechanism comprises an adhesion layer and a plate type heat pipe, an adhesion layer is arranged on the surface of the graphite electrode exposed outside the graphitization furnace, the plate type heat pipe is arranged on one side, far away from the surface of the graphite electrode, of the adhesion layer, the plate type heat pipe comprises a sealing shell, a medium cavity is formed in the sealing shell, a capillary core layer is arranged on the inner wall of the medium cavity, and a cooling medium is stored in the medium cavity; according to the graphite electrode cooling device of the graphitization furnace, the plate type heat pipe is attached to the surface of the exposed graphite electrode, circulating water cooling is not needed, phase change heat transfer of a cooling medium is utilized, the heat dissipation efficiency is improved, phase change heat transfer is not conducted under the low-temperature condition, and invalid heat exchange is avoided.

Electrodes (1) of a three-phase arc furnace (2) are supplied with electrical energy by a multilevel converter (4) via a furnace transformer (3) from a supply network (5) with multiple input phases (6). An associated control device (15) receives measured values ​​for output phase currents (I1, I2, I3) flowing on the output side of the multilevel converter (4). Furthermore, the control device (15) is provided with information about a current output target power (P*) for a given time.The control device (15) determines output-side target phase voltages (U1*, U2*, U3*) for the respective current point in time on the basis of the output-side phase currents (I1, I2, I3) and the output-side target power (P*), so that the sum of the products of the output-side target phase voltages (U1*, U2*, U3*) and the target values ​​(I1*, I2*, I3*) for the output-side phase currents (I1, I2, I3) determined on the basis of the output-side phase currents (I1, I2, I3) is equal to the current output-side target power (P*). The control device (15) controls the multilevel converter (4) such that the multilevel converter (4) provides output-side phase voltages corresponding to the output-side target phase voltages (U1*, U2*, U3*). The control device repeatedly executes these steps with a cycle time (TZ).

The invention relates to the technical field of electrode paste, in particular to electrode paste for a submerged arc furnace and a preparation method of the electrode paste. Comprising three-level grain size distribution anthracite aggregate which is electrically calcined at high temperature and modified by a KH-550 silane coupling agent, a modified silicon carbide whisker and boron-doped graphene-like carbon nitride composite filler, a maleic anhydride-mediated compatible medium-temperature pitch-polyborosiloxane binder and a graphite powder-borax functional additive. A step-by-step mixing and two-stage sintering process is adopted in the preparation process, a covalent bond interface bridging structure is constructed through the coupling agent, the composite dispersing agent regulates and controls the multi-dimensional network distribution of the filler, and the process synergistically improves the compactness and the interface bonding force of the green body. The electrode paste is firm in interface bonding, can form a ceramic protective phase at a high temperature, has excellent conductivity and mechanical strength, and prolongs the service life of the electrode paste for the submerged arc furnace.

Electrodes (1) of a three-phase arc furnace (2) are supplied with electrical energy by a multilevel converter (4) via a furnace transformer (3). Output phase currents (I1, I2, I3) flowing on the output side of the multilevel converter (4) are known to a control device (15) of the multilevel converter (4). The control device (15) determines first output phase voltage components (U11*, U12*, U13* for the respective current point in time, such that a complex first output voltage (U1*) determined by the first output phase voltage components (U11*, U12*, U13*) is oriented in the complex plane parallel to a complex output current (I) determined by the output phase currents (I1, I2, I3).The control device (15) determines second output-side phase voltage components (U21*, U22*, U23*) such that a complex second output-side voltage (U2*) determined by the second output-side phase voltage components (U21*, U22*, U23*) is oriented orthogonally to the complex first output-side voltage (U1*) in the complex plane. The control device (15) controls the multilevel converter (4) such that the multilevel converter (4) provides output-side phase voltages corresponding to the sums of the first and second output-side phase voltage components (U11*, U12*, U13*, U21*, U22*, U23*). The control device (15) repeatedly executes the aforementioned steps with a cycle time (TZ).

A heating zone can be generated adjacent to one or more electrode portions by applying one or more electric currents to the one or more electrode portions. A temperature within the heating zone can be at least 800 K. A mixture of iron ore and one or more reducing agents can be provided within the heating zone, such that the iron ore is directly reduced to iron. In some examples, the one or more reducing agents can include biomass particles, and / or the electrode portion(s) can be formed of a carbonized biomass. In some examples, the heating zone is generated by a plasma formed between a facing pair of electrode portions. In other examples, the heating zone is generated by Joule heating of the one or more electrode portions.

The invention concerns a method to supply electric power to furnaces (100) for melting and / or heating metal materials (M), which provides the supply of a mains voltage (Ur) and a mains current (Ir), both having a predefined mains frequency (fr); the transformation of said mains voltage (Ur) and mains current (Ir) into selectively settable alternating secondary voltage (Us) and secondary current (Is); the rectifying of said secondary voltage (Us) and secondary current (Is) and the conversion of the direct intermediate voltage (Ui) and intermediate current (Ii) into selectively settable alternating supply voltage (Ua) and supply current (Ia); the feeding of said supply voltage (Ua) and supply current (Ia) to a plurality of electrodes (102) of the furnace (100). The invention also concerns an apparatus (10) for supplying electric power to furnaces (100) for melting and / or heating metal materials (M).

The utility model provides a heating module and an aerosol generating device. The heating module comprises a heating pot body, a first electrode and a second electrode. Wherein an accommodating cavity for accommodating an aerosol forming substrate is formed in the heating pot body. The first electrode and the second electrode are arranged outside the containing cavity in a spaced mode, the first electrode and / or the second electrode comprise / comprises a discharging end and a conductive part connected with the discharging end, and the conductive part extends from the discharging end in the radial direction of the heating pot body or in the direction away from the pot bottom of the heating pot body. And when the first electrode and the second electrode are electrified, an electric arc is formed between the discharge end parts of the first electrode and the second electrode so as to heat the heating pot body. In the aerosol generating device, the conductive parts of the first electrode and the second electrode extend from the discharge end part in the radial direction of the heating pot body or in the direction far away from the pot bottom of the heating pot body, so that the first electrode and the second electrode are ensured to discharge at the discharge end part to form an electric arc, and the heating pot body is effectively heated.

The present invention discloses a precise heating control method, device, equipment and storage medium for an electric stove, which relates to the field of electric stove heating control. The method includes: constructing a target input vector according to the obtained cookware type, cookware material, the temperature of the center point of the cookware at the current moment, and the working state information of the plasma electrode of the electric stove at the current moment; inputting the target input vector into a temperature prediction model trained by a historical sample data set, and predicting the target prediction temperature of the target input vector at the next moment through the temperature prediction model; adjusting the power output strategy of the plasma electrode of the electric stove according to the relationship between the target prediction temperature and the preset working temperature. The present invention can precisely control the power output distribution of the plasma electrode according to the cookware material, cookware type and heating requirements.

The present application pertains to an electric arc grill that integrates a range of components for enhanced functionality. Central to this grill is the electric heating device, which includes an electric heating component and a circuit board integrated with electric components. The electric heating component includes an electric output head and an electric connection rod that is securely attached to and electrically connected with the head, ensuring a stable connection to the circuit board. The grill is equipped with a lifting device that is affixed to and grounded by the grill carrier, facilitating the electrical connection with the fire gathering plate. This plate is positioned above the electric output head, creating a gap that is instrumental in generating the electric arc necessary for heating. The grill enables the fire gathering plate to be heated via electric arc, thereby providing a versatile cooking surface capable of frying, grilling, and baking.

An apparatus (10) for the electric power supply of furnaces (100) for melting and / or heating metal materials provided with electrodes (102) comprises at least one power supply line (201, 20 IL, 20 IM) and at least one connected base module (20, 120, 220) which is configured to convert an alternating mains voltage and current (Ur, Ir) having a mains frequency (ft) into alternating supply voltage and current (Ua, la) with a desired power supply frequency (fa), wherein the at least one base module (20, 120, 220) comprises a transformer (11), a plurality of rectifiers (14) connected to the transformer (11), one or more direct current intermediate circuits (16) configured to store electrical energy, a plurality of inverter devices (15) and a control and command unit (17) configured to control and command the operation of the inverter devices (15) and adjust the power supply frequency (fa). The invention also concerns a method for the electric power supply of furnaces (100) for melting and / or heating metal materials.

The invention discloses an efficient electric flame furnace end and an electric flame stove. The efficient electric flame furnace end comprises a shell, a single anode needle, a single cathode tube, a ceramic tube, an air duct inner wall, an air duct outer wall, a heating coil and an airflow generation assembly. The single anode needle and the single cathode tube are arranged, the actual discharge gap between the single anode needle and the single cathode tube can be set to be 10-20 cm and is far larger than the preset discharge distance, air thermal breakdown can still be achieved by adopting stable breakdown voltage in the prior art, extra voltage increase is not needed, meanwhile, the long-distance arrangement of the single anode needle and the single cathode tube is achieved, and the service life of the anode needle and the cathode tube is prolonged. The collision probability of gas molecules and electric field electrons is increased through the long arc, and high-efficiency heating is achieved; in addition, due to the arrangement of the single anode needle and the single cathode tube, the structure of the furnace end is simplified, the number of electrodes and a complex arrangement structure are reduced, and the assembly difficulty and the production and manufacturing cost are reduced; and meanwhile, the simplified structure enables air flow in the furnace end to be smoother, electric field distribution to be more concentrated, and the problems of mutual interference among multiple electrodes, electric field disorder and unstable discharge are avoided.

The invention discloses an electric stove accurate heating control method, device and equipment and a storage medium, and relates to the field of electric stove heating control. The method comprises the following steps: constructing a target input vector according to the acquired cooker type and cooker material of a cooker arranged on the electric stove, the center point temperature of the cooker at the current moment and the working state information of a plasma electrode of the electric stove at the current moment; inputting the target input vector into a temperature prediction model trained through a historical sample data set, and predicting a target prediction temperature of the target input vector at the next moment through the temperature prediction model; and adjusting a power output strategy of a plasma electrode of the electric stove according to a relation between the target predicted temperature and the preset working temperature. According to the invention, the output power distribution of the plasma electrode can be accurately regulated and controlled according to the material of the cookware, the type of the cookware and the heating requirement.

A hybrid ultra-high enthalpy arc heater comprises a rear electrode group, a contraction section, a compression channel, a throat, an expansion section, and a front electrode group. The arc cathode is attached to the electrode of the rear electrode group. The contraction section is mainly used to compress the arc column, completing the first plasma acceleration. The compression channel is used to compress and elongate the arc column, fully heating and ionizing the working gas. The airflow is concentrated to high pressure at the throat, completing the second plasma acceleration. The airflow completes the third plasma acceleration in the expansion section. The arc cathode is attached to the electrode terminal of the front electrode group, where the plasma is subjected to the Lorentz force, achieving the fourth acceleration and ultimately forming an ultra-high enthalpy flow field. This invention can be applied to the field of aerodynamic thermal ground simulation technology research, mainly providing medium and low pressure ultra-high enthalpy uniform flow fields.

The utility model relates to electrode holder sealing technical field, concretely is a kind of ore-heating furnace electrode holder sealing sleeve, including annular water cooling jacket, the sealing ring and sealing ring locking assembly of being arranged in water cooling jacket, platen assembly on water cooling jacket;The sealing ring locking assembly includes two half-round hoops and two screw rods, the end of two The hoop is connected by two screw rods respectively and is annular and located the outside of sealing ring, nut is equipped on the screw rod, the compression spring between the nut and the hoop end portion is set on the screw rod sleeve location.The utility model sealing ring adopts alloy copper H94 material, with high strength, wear resistance and ductility, its upper and lower two parts are each by multiple equal division sector half ring constitutes, by stainless steel hoop and compression spring form adjustable hold tight force.When protective sleeve generates reaction force due to error or deformation, compression spring can slightly loosen, both can adapt holder action, and can maintain sealing pressure, effectively block high-temperature gas and dust leakage.

The utility model relates to the technical field of graphite electrode devices, in particular to a steelmaking anti-oxidation graphite electrode device which comprises an anti-oxidation graphite electrode steelmaking device mechanism. The anti-oxidation graphite electrode steelmaking device mechanism comprises a first anti-oxidation graphite electrode shell, a second anti-oxidation graphite electrode shell, a first steelmaking device fixing plate, a steelmaking inlet, an inlet base, a second steelmaking device fixing plate and a first supporting column. When the equipment is operated, materials are put into the steel-making conveying pipeline through the steel-making inlet, the heating equipment and the cooling equipment are started through the control equipment to work, and when refining of the materials is completed, the control equipment is used again to open the steel-making outlet so that the materials can reach the steel-making storage plate through the steel-making conveying pipeline to be stored. The equipment has the beneficial effects that the heating equipment is assembled, so that raw materials and metal can be rapidly heated, the production efficiency in the steelmaking process is improved, and the temperature in the furnace is accurately controlled.

The utility model discloses an auxiliary electrode of a direct-current electric arc furnace, which belongs to the technical field of electric arc furnaces and is characterized in that an auxiliary anode is arranged, so that the cathode current of the electric arc furnace is increased under the condition that the anode current of the electric arc furnace is not changed, and the temperature of a cathode molten pool of the electric arc furnace is increased; the auxiliary anode does not need to be additionally provided with a direct-current power supply, the silicon controlled rectifier power supplies of the anode and the cathode of the electric arc furnace are directly utilized, the equipment investment is greatly reduced, the power supply structure is simplified, and the silicon controlled rectifier four-electrode without the bottom electrode is also suitable for the direct-current electric arc furnace with six or more electrodes. The two IGBTs can be combined into one IGBT.

The invention relates to a pressure ring assembly, a pressure ring section and a wedge connector between pressure ring sections. The pressure ring assembly (10) includes at least a first section (12.1) and a second section (12.2) connected to each other in an abutting relationship by a removable wedge connector (14) including a first fork (36) and a second fork (38). Each section comprises a body (20) extending in an arcuate manner between a first side wall (22) and a second side wall (24) thereof. Each section defines a first elongated aperture (26) and a second elongated aperture (28). Each hole has a rounded wall section (30) facing the adjacent side wall with a radius of at least 15 mm. The first fork and the second fork are separated from each other at an angle less than 15 degrees. The first fork extends into the second bore of the first section and the second fork extends into the first bore of the second section. The mutually facing contact surfaces (46, 48) of the first and second forks have a contour complementary to the rounded wall section (30) of the bore.

The invention discloses a graphite electrode with a combined cooling structure. The graphite electrode comprises an electrode body and an electrode contact, the electrode body is a graphite electrode, a central through hole is formed in the electrode body, and the electrode contact is fixedly assembled at the upper end part of the electrode body; a sealing table top is formed on the lower surface of the electrode contact, and a conduit and an annular seat are formed on the sealing table top; the upper part of the conduit is connected with an air supply pipe through an electrode joint; the annular base is provided with a hollow structure cavity, the upper portion of the hollow structure cavity is connected with a water supply pipe through an electrode connector, and water outlet holes communicated with the hollow structure cavity are evenly formed in the annular face of the bottom of the annular base. And the electrode contact is provided with a discharge hole for discharging cooling gas and cooling water at the same time on the sealing table surface and between the guide pipe and the annular seat. The invention solves the limitation of the traditional cooling mode, and can obviously improve the cooling efficiency and prolong the service life of the graphite electrode.

The converter device is configured to convert a DC voltage and a DC current into an AC voltage and an AC current that is supplied to a load (L). The converter device comprises a bank (11) of capacitors (12), a plurality of power semiconductors (13), a heat sink (14), and a casing (15).

This invention discloses a feeding device and a feeding method for electrodes in an electronic glass furnace, belonging to the field of auxiliary equipment for electronic glass furnaces, comprising: a drive gear, an output gear, a drive motor, a connecting component, and a fixed motion component; wherein several output gears are each toothed with the drive gear, wherein both the output gears and the drive gear are rotatably mounted on the fixed motion component, wherein the front end of the transmission shaft of the output gears is connected to the connecting component, wherein the output gear is connected via the connecting component to the feed threaded rod of the electrode in the electronic glass furnace in use and is driven synchronously, wherein the rear end of the central shaft of the drive gear is connected to the drive motor.This invention solves the problem, according to the prior art, that the feed accuracy of the feed thread rod is low when inserting the electrode.

A dual electrode DC electric arc melter 10 for a conductive material 12 comprises a vessel 14 for holding the material. The vessel comprises a sidewall 16, a roof 18 and a bottom 20 and defines a taphole 22 for molten metal. A tilting mechanism 24 enables selective tilting of the vessel to tap the molten metal from the vessel. First 26 and second 28 electrodes, in a normal operative position, extend through the roof into the vessel. An electrode manipulating arrangement 30 is configured to move the electrodes between the normal operative position and a position away from the vessel. A DC power system 32 drives via a DC output the first electrode as a cathode and the second electrode as an anode. An arc deflection compensation circuit 50 is provided for reducing deflection towards the sidewall of arcs extending from the first and second electrodes.

The invention discloses a modified additive, electrode paste based on the modified additive and a preparation method of the electrode paste, and belongs to the technical field of electrode paste preparation. The preparation method comprises the following steps: by taking asphalt compositely modified by natural latex and nano silicon dioxide as a core, constructing a carboxylated nano cellulose connecting layer on the surface of the core through an emulsification technology, then constructing a graphene oxide shell layer outside the connecting layer, and drying to form a modified additive with a core-shell structure; the modified additive disclosed by the invention can restrain the core asphalt in the electrode paste sintering stage, prevent the core asphalt from flowing too early, and stabilize the paste column form to restrain layering; carboxylated nanocellulose is carbonized at high temperature to generate short-range carbon fibers, graphene oxide is reduced into reduced graphene oxide, the short-range carbon fibers and the reduced graphene oxide are interwoven with a modified asphalt coking product to form a composite reinforced network, and the mechanical strength and toughness of the electrode are improved; the modified additive disclosed by the invention is added into aggregate, powder and an adhesive in a dry mixing stage to prepare the electrode paste based on the modified additive, and the electrode paste has relatively good hard fracture resistance.

The power supply system (1) for arc furnace (2), includes: - a power converter (9), and - a polyphase transformer (10), The power supply system further comprises first disconnecting means (13) connecting the input of the power converter to the primary circuit, second disconnecting means (14) connecting the output of the power converter to the primary circuit, and the power supply system further comprises a control circuit (11) configured: o to control the power converter to supply the electrode and to stabilize the courant and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are open and the second disconnecting means are closed, and o to control the power converter to stabilize the courant and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are closed and the second disconnecting means are open.

The utility model relates to a graphite electrode structure, and belongs to the technical field of graphite electrodes. The graphite electrode assembly comprises a graphite reducer union, a graphite screw rod, a graphite joint and a graphite electrode, a first internal threaded hole and a second internal threaded hole are formed in the graphite reducer union, the first internal threaded hole is formed above the second internal threaded hole, the diameter of the first internal threaded hole is larger than that of the second internal threaded hole, and the first internal threaded hole is in threaded connection with an external thread of a copper rod; the upper end of the graphite screw rod is in threaded connection with the second inner threaded hole; the graphite joint is provided with an internal thread and is in threaded connection with the lower end of the graphite screw rod, so that the upper end surface of the graphite joint is propped against the lower end surface of the graphite reducing joint; the graphite electrode comprises an upper end part and a body part, the body part is arranged below the upper end part, the upper end part is provided with an external thread, the external thread of the upper end part is in threaded connection with the internal thread of the graphite joint, and the body part is used for discharging. The graphite electrode has the effect of improving the problem that the graphite electrode is prone to arc breaking.