636 results about "Plasma torch" patented technology

The invention discloses a plasma spraying preparation method for a micro-nano double-layer PTFE coating on the surface of a flexible shaft steel wire, and particularly relates to the technical field of functional materials.The plasma spraying preparation method comprises the following steps that 1, a mandrel and a steel wire are installed on twisting equipment, and an inductive coupling plasma torch tube is installed on a driving guide rail parallel to the mandrel; 2, the pickling solution serves as a raw material, the pickling solution is atomized into micro-droplets through a feeding system and an air supply system, the micro-droplets are rapidly sprayed out of the torch pipe, and pickling spray is formed; 3, the twisting equipment is started, the steel wire is twisted around the mandrel, meanwhile, the driving guide rail is started, the twisted steel wire is subjected to acid pickling treatment through acid pickling spray sprayed out of the torch pipe, and the surface of the steel wire is roughened; 4, feeding of the pickling solution is stopped, high-flow gas is introduced into the torch pipe through the gas supply system to form high-speed gas flow, and the residual pickling solution on the surface of the flexible shaft is blow-dried; and 5, starting an inductively coupled plasma spraying system, injecting the PTFE emulsion serving as a raw material into plasma flame flow, driving a guide rail to move to enable the plasma flame flow to scan the steel wire on the surface of the flexible shaft, and depositing a PTFE coating on the surface of the steel wire. According to the method disclosed by the invention, the double-layered PTFE coating is deposited on the surface of the steel wire by using an inductive coupling plasma spraying process for the first time in the flexible shaft steel wire twisting process, so that one-step rapid preparation of the anti-corrosion coating is realized.

The invention discloses a control process and equipment for processing waste gas treatment in the generic semiconductor industry, and relates to the technical field of semiconductor, panel, solar energy and LED waste gas treatment. The equipment comprises a gas inlet control unit, a plasma torch, a reaction cavity, a water tank and a washing tower which are sequentially connected, wherein the gas inlet control unit comprises a three-way valve to realize switching of a main machine and a standby machine; the water tank is provided with a heat exchange and monitoring part; the washing tower comprises a washing section, a turbulent flow section and a demisting section. The process comprises the steps of air inlet control, pyrolysis combustion, cooling and pre-dedusting, water washing, washing tower treatment and the like, and is combined with PID control of plasma power and CDA consumption, and logic control of drainage, flushing and the like. The problems of pipeline blockage and corrosion caused by high operation cost, short PM period and poor washing effect in the process of treating high-dust and high-corrosion process waste gas in the prior art are solved, and the method has the advantages of reducing the cost, prolonging the maintenance period, improving the treatment efficiency and the like.

Described herein are methods and systems for non-contact boring of tunnels, trenches, and / or vertical shafts. A system comprises a chassis, a non-contact boring element, and a boring actuator connecting the non-contact boring element to the chassis and configured to position the non-contact boring element relative to the bore face. These three elements may form an internal subsystem as this subsystem within a tunnel, trench, or shaft. In some examples, a system further comprises an external subsystem, which is positioned away from the tunnel, trench, or shaft. The external subsystem is connected to the internal subsystem using an umbilical cord (e.g., providing power and control signals to the internal subsystem). Furthermore, the system may include an ejecta removal subsystem operationally coupled to the internal and external subsystems. Some examples of a non-contact boring element include a combustor (e.g., a jet turbine, a flame jet) and a plasma torch.

The utility model relates to the technical field of semiconductor tail gas treatment, in particular to a plasma tail gas treatment device which comprises a reaction assembly, a cooling pipe, a washing assembly, a water-gas separation assembly and a gas outlet pipe, the washing assembly comprises a water tank and a washing pipe, and the cooling pipe and the washing pipe are both fixedly installed above the water tank; the reaction assembly comprises a reaction cavity, an air inlet pipe and a plasma torch; an annular air plate for inputting combustion air is connected between the reaction cavity and the cooling pipe; spraying pipes for washing gas are arranged in the water tank and the washing pipe; the water-gas separation assembly comprises a water-gas separation pipe and a water-gas separation mechanism. According to the utility model, the plasma moment and the washing assembly are used for carrying out full treatment and spray hydrolysis on process gas, so that water-soluble substances are discharged as wastewater, and the treated gas reaching the standard is discharged to a common affair central system, so that full treatment of waste gas is completed; and the air supplementing mechanism is arranged for secondary air supplementing, and meanwhile, when the plasma moment loses efficacy, the air flow can be increased to dilute the waste gas.

The invention provides a plasma heating hydrogen-rich direct reduction ironmaking system and method. The system comprises a plasma shaft furnace, a heat exchanger, a washer, a desulfurization device, a dehydration device and a pressurization device, the plasma shaft furnace comprises a feeding area, a reduction area, a blanking area and a plasma heating area from top to bottom; the plasma heating area is provided with a hydrogen plasma torch, a thermal reduction gas circulation outlet and a hydrogen inlet; and the hydrogen plasma torch is used for heating and ionizing hydrogen entering from the hydrogen inlet. According to the system and method, the green electricity hydrogen plasma torch is adopted for heating and ionizing hydrogen, then sponge iron is heated and reduced to produce molten iron, compared with a traditional hydrogen heating mode, the heating speed is high, the temperature is high, carbon-containing fuel is not combusted, safety and hydrogen embrittlement are achieved, compared with a traditional shaft furnace for producing sponge iron, low-quality ore can be adopted for producing molten iron, and the production cost is low. The control is convenient.

The invention discloses single-walled carbon nanotube production equipment and a control method thereof, and belongs to the technical field of single-walled carbon nanotube production. The production equipment comprises a main reactor as well as an arc plasma torch assembly and a catalyst assembly which are mounted on the main reactor, and the arc plasma torch assembly and the catalyst assembly respectively extend into the main reactor and are arranged at intervals; a catalyst supplementing opening is formed in the upper side of the main reactor and is communicated with a catalyst feeding assembly through a catalyst supplementing pipeline; and the control unit is used for controlling the state of the catalyst supply assembly according to the voltage value of the arc plasma torch assembly. The invention solves the problem of production interruption caused by unstable electric arc between the cathode and the anode of the existing single-walled carbon nanotube production equipment.

Some embodiments herein are directed to devices and methods for automatically starting a plasma utilizing a wand. In some embodiments, the wand may be used to start a plasma in a plasma torch such as, for example, a microwave plasma torch or an induction plasma torch, as discussed below. The wand may comprise an elongate, hollow wand member comprising a closed distal end, a proximal end, and one or more apertures extending from a hollow interior of the wand member to an exterior surface of the wand member; and an elongate wire member positioned within the hollow interior of the wand member and extending along at least a portion of a length of the wand member, wherein the wire member is configured to be placed in operable communication through the aperture with a power source, such that the power source can be activated to in turn start the plasma within the plasma torch. The plasma torches discussed herein may be used in various applications including, for example, high volume synthesis of advanced materials such as nano-materials, micro-powders, coatings, alloy compositions for additive manufacturing.

The invention discloses a numerical simulation method for a direct-current arc plasma torch based on a thermodynamic unbalanced state and a coupling electrode sheath effect, and the method comprises the steps: building a two-dimensional axial symmetry or three-dimensional equivalent geometric model of the plasma torch based on an actual physical structure of the direct-current arc plasma torch; performing mesh generation to obtain a discretization analysis model; establishing thermodynamic parameters and transport coefficients of a plasma working medium; constructing a control equation set of the coupling electrode sheath effect based on the thermodynamic non-equilibrium state; setting boundary conditions of the plasma torch according to actual conditions; in the discretization analysis model, carrying out numerical value initialization on each grid unit; performing steady state and transient state simulation calculation; and performing post-processing on the steady-state and transient simulation results. According to the invention, the actual unbalanced effect of an electrode boundary layer is simulated through a thermodynamic unbalanced state; through the coupling electrode sheath effect, the interaction between the plasma and the electrode is simulated, and the error caused by manually applying boundary conditions is avoided; the requirement of current continuity is met through self-adaptive iterative solution of sheath voltage, so that the numerical simulation precision of the plasma torch is improved.

The invention belongs to the technical field of ICP spectral analysis, and particularly relates to an angle-adjustable monochromator type concave holographic grating, a spectrometer and a method. A servo motor in the holographic grating is connected with a lead screw mechanism and can drive a lead screw of the lead screw mechanism to rotate, a polished rod bearing is connected to a connecting block, the connecting block is fixed to the movable end of the lead screw mechanism, a monochromator type concave holographic grating body is connected to a movable base, one end of a polished rod makes contact with the monochromator type concave holographic grating body, and the other end of the polished rod makes contact with the movable base. The other end is matched in the polish rod bearing; according to the invention, two DMDs and a monochromator type concave holographic grating are adopted to realize spatial imaging spectral analysis, the first DMD realizes spatial position selection of an ICP plasma torch, the monochromator type holographic grating realizes high-efficiency and simple-structure rotating grating type light splitting, and the second DMD is selected as an exit slit with adjustable width to carry out fine light splitting on a selected wave band, so that the light splitting efficiency of the ICP plasma torch is improved. Therefore, the spatial imaging spectrum analysis of the ICP plasma torch by the system is realized.

The invention belongs to but not limited to the technical field of underground coal gasification, and discloses an underground coal gasification method and gas injection equipment. Constructing a directional drill hole and a gasification channel penetrating through the underground coal seam; a gas injection pipe with a plasma torch is put into the gasification channel, a gasification agent is injected, and in-situ gasification of the underground coal seam is implemented; and the generated gas is conveyed to the ground for collection through the drill hole. According to the underground coal gasification method and the gas injection equipment provided by the invention, the gasification agent is activated by the plurality of plasma torches arranged in the directional channel at the tail end of the gas injection pipe and then is directionally jetted to the coal seam, so that the gasification agent is in contact with the coal seam in a short time and is gasified, the directional conveying of the plasma gasification agent is realized, and the effective utilization rate of the plasma gasification agent is improved; meanwhile, a combustion space area of the coal seam after gasification can be expanded in a fan shape in the longitudinal direction with the gasification agent outlets of the plasma torches as the center, the expansion equivalent radius of the combustion space area is relatively large, and a large amount of coal can be gasified through one gasification channel.

The direct-current arc plasma furnace comprises a furnace body and a furnace cover arranged at the top of the furnace body, a negative electrode with the lower end extending into the furnace body is arranged in the center of the furnace cover, a plasma torch generating device with the lower end extending into the furnace body is arranged on the furnace cover, a feeding port is formed in the furnace cover, and a waste gas discharging port is formed in the upper portion of the furnace body. A molten liquid outlet and an iron outlet are formed in the lower portion of the furnace body, and the iron outlet is lower than the molten liquid outlet. The combustion-supporting furnace is scientific in principle, compact in structure and high in safety, the combustion-supporting range completely covers the internal area of the furnace body, crusting is avoided, waste incineration is more sufficient, the combustion efficiency is high, and more energy is saved.

The utility model discloses a nano silicon powder plasma preparation system, relates to the field of nano silicon powder preparation, and solves the problems of low preparation efficiency and low practicability due to the fact that an existing device needs to use open fire to heat up, and adopts the following scheme that the nano silicon powder plasma preparation system comprises a spheroidizing furnace body, a plasma torch system and a feeding system are fixedly mounted at the top of the spheroidizing furnace body, and a receiving system is fixedly mounted at the bottom of the spheroidizing furnace body; the plasma torch system is composed of three torches inclining inwards in the same direction. A main body of the feeding system is a spiral feeder, and the tail end of the spiral feeder is fixedly connected to a trough in the top of the spheroidizing furnace body; a main body of the material receiving system is a ceramic filter; according to the nano silicon powder plasma preparation system, through the arrangement of the device, electric energy can be directly converted into fluid heat energy by utilizing a plasma torch system, convection heat exchange is carried out through plasma high-temperature flame flow and high-melting-point particles, the surfaces of the particles are melted, and the technology that the particles have regular spheres is achieved.

The invention relates to the technical field of cutting equipment, and provides heat exchanger tube nest numerical control cutting equipment and a high-precision cutting method.The heat exchanger tube nest numerical control cutting equipment comprises a base, a first supporting plate, a second supporting plate and a third supporting plate are arranged on the base in the length direction of the base, and the first supporting plate is slidably connected to the base; the second supporting plate and the third supporting plate are both fixed to the base. According to the vertical cutting device, a second rotating disc is accurately controlled to rotate through a third driving mechanism, the second rotating disc rotates to drive a stop lever to move in a limiting groove, a support is pushed to rotate with a third hinged shaft as the center, and the spraying direction of a plasma spraying gun is tangent to the tube wall of the tube nest; when plasma is cut, a reflecting surface is formed on the inner wall of the other side, so that plasma hedging is caused, the plasma beam is jetted in the tangential direction through tangent angle cutting, the hedging phenomenon is avoided, the cutting gap is controlled, and the cutting precision is improved compared with a traditional mode.

A method and apparatus for operating a DC plasma torch. The power supply used is at least two times the average operating voltage used, resulting in a more stable operation of the torch. The torch can include two concentric cylinder electrodes, the electrodes can be graphite, and the plasma forming gas can be hydrogen. The power supply provided also has the capability of igniting the torch at a pulse voltage of at least 20 kilovolts.

The invention discloses a plasma heating catalytic ammonia decomposition hydrogen production system which comprises a power supply, a plasma reactor, a first heat exchanger, an adsorption device, a nitrogen tank and an ammonia tank, and the power supply is electrically communicated with the plasma reactor; the plasma reactor is divided into a power-on area and a decomposition area which are not communicated but connected with each other; the nitrogen inlet, the nitrogen outlet and the electrifying opening are respectively communicated with the electrifying area, and the ammonia gas inlet and the decomposed gas outlet are respectively communicated with the decomposing area; the electrifying area comprises a plurality of plasma torches arranged at intervals, one ends of the plasma torches are communicated with the nitrogen inlet, and the other ends of the plasma torches are communicated with the nitrogen outlet and penetrate through the decomposing area; the ammonia gas tank and the decomposed gas outlet are simultaneously communicated with the first heat exchanger; the first heat exchanger is also communicated with the ammonia gas inlet and the adsorption device; the nitrogen tank is communicated with the nitrogen inlet. The plasma heating catalytic ammonia decomposition hydrogen production system reduces the temperature rise time of the ammonia gas, greatly improves the heating effect of the ammonia gas, and is beneficial to full and uniform decomposition of the ammonia gas.

A plasma torch includes a nozzle with an opening and an electrode disposed interiorly of the nozzle and configured to generate a plasma arc and direct the plasma arc through the opening of the nozzle. The electrode includes an electrode body and an emissive insert disposed in the electrode body. The emissive insert is movable relative to the electrode body.

The application provides a method for controlling nitrogen in steelmaking by spraying hydrogen containing plasma, including: using a mixture of hydrogen rich gas and argon gas to generate hydrogen plasma for denitrification of molten steel during at least one of arc furnace smelting, ladle refining, VOD refining, and RH refining. The method for controlling nitrogen in steelmaking by spraying hydrogen containing plasma provided in the application can effectively remove nitrogen from the molten steel by spraying a mixture of argon gas and hydrogen rich gas into the molten steel through a hollow electrode and plasma torch, reducing electrode consumption and electricity consumption per ton steel, and also reducing arc radiation heat loss, improving heating rate, thereby shortening smelting time and reducing production costs.

A plasma torch system includes a regulator configured to direct a first portion of the gas flow from a gas source toward a consumable of a plasma torch, the regulator being configured to regulate a pressure of the first portion of the gas flow directed toward the consumable based on a pressure in a pilot chamber. The plasma torch system also includes a valve fluidly coupled to the pilot chamber and configured to direct a second portion of the gas flow from the gas source toward the pilot chamber. The valve, in the first position, is configured to increase the pressure in the pilot chamber at a first ramp rate, and the valve, in the second position, is configured to decrease the pressure in the pilot chamber at a second ramp rate.

The invention discloses a plasma ever-burning ignition control system which is composed of a communication module, an ignition execution module, a power supply control module and a monitoring module. Through the real-time monitoring module and the analysis module, the purpose of reducing tempering easily caused by an existing plasma torch during ignition is achieved, the tempering phenomenon can be solved in time after tempering occurs, the use risk is reduced, the collaboration among the system modules is good, and the safety of the system is improved. The communication module, the ignition execution module, the power supply control module and the monitoring module are clear in labor division and closely cooperate, communication modes are diversified, internal efficient interaction and remote monitoring management can be achieved, power supply control is accurate, voltage can be stably adjusted, parameters can be monitored and analyzed in real time, and it is guaranteed that plasma is stably generated and ignition is successful.

This invention provides a method for generating high-temperature coal gas based on an electric arc plasma torch, comprising the following steps: feeding carbon-containing powder and at least one energy-carrying medium into different inlets of the electric arc plasma torch; the carbon-containing powder being carried circumferentially and uniformly into the arc channel within the electric arc plasma torch by a carrier gas; the at least one energy-carrying medium, after entering the electric arc plasma torch, passing through a fluid passage on the arc channel wall and entering the arc channel; initiating an electric arc in the arc channel to generate plasma; the energy-carrying medium and the carbon-containing powder being heated together by the plasma, and then ejected together from the nozzle of the electric arc plasma torch. This invention utilizes the energy-carrying medium to perform divergent cooling, evaporative cooling, or endothermic chemical reactions near the arc channel wall, directly absorbing the radiation and convection heat transfer to the pipe wall from the plasma, greatly improving the thermal efficiency of the plasma torch, and inhibiting coking of the gasified carbon-containing powder on the arc channel wall of the plasma torch.

The present invention concerns a furnace for melting vitrifiable materials, comprising (i) a melting tank with heating means configured to melt vitrifiable materials; (ii) a fining tank with heating means configured to refine the melt; (iii) a neck separating the melting tank and the fining tank; (iv) inlet means located at the melting tank to charge the vitrifiable materials; (v) outlet means at the fining tank to flow the refined melt to a working zone; wherein the heating means in the fining tank comprises a plurality of thermal plasma torches configured to emit from a working fluid a plasma flame above the melt.

The invention provides a side blowing type plasma reinforced multi-metal composite melt reduction recovery method and a reduction furnace, the reduction furnace comprises a molten pool and a plasma mechanism, a melt converging opening is formed in the upper portion of the molten pool applied to multi-metal composite melt reduction recovery, and a flue, a slag discharging opening and a siphon opening are formed in the side, away from the melt converging opening, of the molten pool; the flue, the slag discharge port and the siphon port are sequentially arranged from top to bottom; the plasma mechanism comprises a plasma torch, the plasma torch is provided with a blowing port, the blowing port extends into the molten pool from the side direction and is located in a reduction reaction area of the molten pool so as to provide lateral airflow for the reduction reaction area in the reduction reaction process, and the included angle alpha between the blowing direction of the blowing port and the horizontal plane is larger than or equal to-30 degrees and smaller than or equal to 30 degrees. The problems that the contact of the reducing agent is limited and the reaction kinetics is blocked due to adhesion of the high-zinc melt are solved from the source, and the reduction effect is optimized.

An apparatus for powder spheroidisation comprises a microwave cavity (20), a plasma chamber (35) that has an inner wall and is located in the microwave cavity, a confinement tube (3) connected to the plasma chamber, a receptacle for a mixture of a process gas and a powder precursor, the receptacle being connected to the confinement tube to feed said mixture as an incoming gas flow to the plasma chamber, in order to produce a plasma torch therein by coupling the gas flow with microwave radiation, and a flow divider (110) that is located within the confinement tube at the entrance of the plasma chamber, the flow divider providing a broad passageway (118) and a narrow passageway (113), and causing the incoming gas flow to separate into a central gas flow through the broad passageway, and a peripheral gas flow through the narrow passageway.

The invention relates to the field of waste gas purification, in particular to a waste gas anhydrous treatment device which comprises a gas inlet unit, a heat source unit, a reaction unit, a cooling unit, a slag collecting unit and a tail gas discharging unit. The gas inlet unit comprises a gas inlet pipe, and the gas inlet pipe can convey waste gas into the reaction unit; the heat source unit comprises any one of a plasma torch head, an ignition combustion flame gun and a high-temperature heating rod, and the heat source unit is mounted on the reaction unit; according to the designed water-free waste gas treatment device, waste gas is combusted through cooperation of the heat source unit and the reaction unit, products are cooled in the position of the reaction unit in a mixed mode of air cooling and water cooling when being cooled, sufficient combustion of the waste gas is guaranteed, meanwhile, the whole reaction unit can be protected, and the service life of the reaction unit is prolonged. The purposes of reducing the use amount of energy, reducing the generation of waste water and saving water are achieved.

The present invention relates to the field of automation control technology, and more specifically, to an automatic feeding and process adjustment control method for a plasma rotating electrode atomization device, wherein the image data between the plasma torch nozzle and the front end of a workpiece is obtained by an industrial camera; based on the image data, the distance L between the plasma torch nozzle and the front end of the workpiece is calculated by an image processing algorithm; according to the distance L, the workpiece feeding speed adjustment strategy is determined; and the workpiece feeding speed control instruction is output to the equipment controller. The method of the present invention realizes the accurate measurement of the distance between the plasma torch nozzle and the front end of the workpiece by introducing high-precision image acquisition and processing technology. Combined with an intelligent control algorithm, the system can automatically adjust the workpiece feeding speed to maintain the optimal atomization state. This not only greatly improves the stability and consistency of the production process, but also significantly reduces the workload of operators.

The invention discloses an amorphous carbon-coated porous cellular VO 2 / V 2 O 5 Composite material and preparation method and application thereof, the amorphous carbon coated porous cellular VO 2 / V 2 O 5 A composite material comprising a core material and an amorphous carbon layer covering the core material, wherein the core material comprises micron-sized VO 2 / V 2 O 5 Particles, the VO 2 / V 2 O 5 The surface of the particles is a porous cellular structure. In the present invention, vanadium pentoxide powder is delivered to the reaction chamber of a plasma device by a carrier gas, and a carbon source gas is introduced and a plasma torch is turned on to react, so that amorphous carbon-coated porous cellular VO is obtained. 2 / V 2 O 5 Composite material. It is used as the positive electrode active material of aqueous zinc battery. ‑1 120 mAh· g ‑1 The initial specific capacity is 115 mAh g after 3000 cycles. ‑1 Specific capacity.

Disclosed herein are lithium carbon composite materials and devices including at least one of lithium carbon composite materials. Also disclosed are reactors configured to receive lithium, lithium precursors, carbon, and / or carbon-containing precursors in a solid state, a vapor state, or a combination thereof. The reactors convert material states using a plasma torch as necessary in order to allow impregnation of lithium into pores of a carbon material.

The invention relates to the technical field of mass spectrometers, in particular to an intelligent function optimization method for an inductively coupled plasma mass spectrometer, which comprises the following steps: S1, multi-parameter real-time monitoring: acquiring plasma torch temperature, ion lens voltage and mass spectrum detector noise parameters in real time through an embedded sensor array; s2, intelligent control adjustment: dynamically adjusting the power of a radio frequency generator and the carrier gas flow by adopting a self-adaptive fuzzy PID controller; s3, stability prediction modeling: establishing a plasma stability prediction model based on a deep belief network DBN, and outputting optimization parameters according to real-time acquired data; s4, virtual verification optimization: simulating the influence of parameter adjustment on mass spectrum resolution through a digital twin system; through multi-sensor monitoring, self-adaptive control and digital twinborn verification, the analysis precision and stability are remarkably improved, the matrix interference problem is effectively solved through the intelligent pretreatment technology, reliable operation of equipment is guaranteed through a three-level emergency mechanism, and manual intervention and maintenance cost are greatly reduced.

The utility model relates to the technical field of carbon nano tube production, and provides carbon nano tube production equipment which comprises a catalyst precursor vaporization device, a catalyst precursor cracking and refining device and a carbon nano tube generation device, the catalyst precursor vaporizing device vaporizes raw materials and conveys the vaporized raw materials into the catalyst precursor cracking and refining device through carrier gas to be excited and activated to generate a catalyst, and a carbon source is subjected to the action of the catalyst subjected to high-temperature cracking and excitation and activation in the carbon nanotube generating device to generate carbon nanotubes which are collected through the collecting device. According to the scheme, the catalyst precursor is cracked, excited and activated by the plasma torch through the catalyst precursor cracking and refining device to form the nanoscale catalyst, so that the catalyst and the carbon source can be fully contacted to generate the carbon nanotube, and the conditions such as the generation temperature, the reactant pressure, the flow and the mass ratio are controllable; in order to further guarantee the generation efficiency of the carbon nanotubes, hydrogen is introduced into the carbon nanotube generation device to promote the increase of the reaction rate, the production efficiency is high, and the cost is low.

The utility model relates to plasma torch technical field, and disclose a kind of plasma torch for coating preparation, including gun rod and fixedly installed in the gun rod side gun mouth, when using the device for spraying, coating can be heated to high temperature and quickly sprayed outwards by gun nozzle, when gun nozzle is sprayed, nitrogen filled in the air storehouse arranged in its inside will be heated expansion and push movable tube due to high temperature when spraying, movable tube slides to be wrapped in the inside of movable tube, movable tube is dark light-transmitting material, harmful light generated by spraying can be blocked by movable tube at this time, the plasma torch for coating preparation can be heated and expanded by nitrogen in air storehouse by high temperature generated when spraying in actual use, gas expansion pushes movable tube outwards and shields gun nozzle, harmful light generated by gun nozzle spraying can be effectively shielded, greatly reduce the harm to staff.