73results about How to "Guaranteed temperature rise" patented technology

The invention discloses a special automatic vehicle coaxial combination brushes DC motor with functions of power self-regulating and temperature control. The motor has the following technical points: more than two stators with the same structure are mounted in a motor base, and more than two rotors with the same structure are correspondingly mounted on a rotary shaft; a wind cover is mounted outside the end cover of non-shaft stretch end, an air vent is formed in the middle of the wind cover, and is communicated with a blast pump; another air vent is formed at the end cover of the non-shaft stretch end, and a ventilation port is formed on the motor base; a temperature sensor is arranged in the motor base, and is connected to a temperature controller, and the temperature controller is connected with the blast pump and a power supply; the phase line of the stator winding of each stator and a control line are respectively connected to a corresponding sub-frequency conversion controller, each sub-frequency conversion controller is connected with a circuit controller, and the circuit controller is connected with the power supply. The motor disclosed by the invention can enlarge start torque, saves energy, lowers the cost of the frequency conversion controllers, and reduces the temperature rise of the motor.

The invention discloses an isolation switch and a conductor thereof. The conductor of the isolation switch comprises a main conductor; the head of the main conductor is integratedly provided with an annular housing-shaped head part shielding structure for sleeving the outer circumference of a moving contact or a static contact; the head part shielding structure is coaxial with a main conductor; a rotating bus is a rotating body of a curve which is bent along an arc track from the head part of the main conductor; through the combination of the traditional isolation switch conductor and the shielding housing, the surface area is increased through the head part shielding structure, and the current conduction is realized; the head part shielding structure can perform shielding on the head part of the main conductor and uniformly isolates the power plant inside the switch; in the meantime, the integration design of head part shielding structure on the head part of the main conductor eliminates the bolt connection between the traditional conductor and the shielding housing, and reduces the kinds and amount of the parts inside the isolation switch. The compact structure design of the conductor enables the isolation switch to be simple and easy to disassemble.

The invention belongs to the technical field of dish-washing machine control, and provides a dish-washing machine and a washing control method and system for the same. During a dish washing process conducted by the dish-washing machine, a washing motor runs in a high-speed and low-speed alternate switch mode controlled by a motor drive circuit, the dish cleaning effect can be improved during high speed running of the washing motor, and an average working current of the washing motor can be reduced through the high-speed and low-speed switch at the same time, so that non standard-exceeding of temperature rise of the motor drive circuit is guaranteed; meanwhile, the working current of the washing motor is subjected to successive detection according to preset detection times, the normal times of the motor current are subjected to superposition counting if overflowing does not occur in the working current of the washing motor; after the completion of the detection, if it is concluded that overload running occurs in the washing motor according to the normal times of the motor current and the preset detection times, the motor drive circuit is controlled to stop working, so that overloading of the washing motor is accurately judged and the motor drive circuit is timely shut off to avoid the component damage due to the temperature rise.

This invention discloses a digital-controlled wire stripping machine characterized by that each step motor is electrically connected with the said step motor corresponding constant current chopper driver separately. after being fitted with constant chopping drive and static and dynamic current adjustment, the step motor has more powerful driving force, quicker rotating speed and more stable operation, and a gripping device is set up at the terminal for orderly and regular operation guided by a single-chip computer to increase the stripping quality.

The invention relates to a control method of an ethylene carbonate synthesis process. According to the invention, ethylene carbonate is synthesized through a gas-liquid-solid three-phase reaction with carbon dioxide and ethylene oxide. The method is mainly provided for solving the problems of temperature runaway and low product purity of prior arts. According to the invention, key process control indicators of the reaction are controlled with an automatic control system. A catalyst is fixed with porous baffles in a reaction bed layer. Liquid-phase and gas-phase raw materials respectively enter from the upper part and the lower part of the reactor. Catalyst bed layer temperature rise in the reactor is controlled with outer circulation material flow, such that the bed layer temperature rise is controlled within a certain range. Product purity is controlled with secondary reactor outlet liquid phase output amount. With the technical scheme, the problems are well solved. The method can be applied in industrial productions of ethylene carbonate synthesis.

The control method relates to a control method for an ethylene carbonate synthesis process; a gas-liquid-solid three-phase reaction of carbon dioxide and ethylene oxide is preformed to generate ethylene carbonate, and the problems of easy temperature runaway and low purity of a product existing in the prior art are mainly solved. The problems are relatively well solved by adopting the technical scheme that key process control indexes of the reaction are controlled by an automatic control system, a catalyst is fixed by a porous baffle plate in a reactor bed layer, a liquid-phase raw material and a gas-phase raw material respectively enter from the upper part and the lower part of the reactor, a one-section synthesis reactor liquid level is controlled by using the output quantity of a one-section synthesis reactor outlet liquid phase, and the purity of the product is controlled by using the output quantity of a two-section synthesis reactor outlet liquid phase. The control method can be used for industrialized production of ethylene carbonate synthesis.

The invention discloses a large vertical centrifugal casting machine which is one of centrifugal casting machines. By a reasonable host machine structure and the cooperative working of temperature measuring, vibration measuring, cooling and advanced automatic control systems, the defect of the traditional centrifugal casting machine is overcome, the comprehensive performance of the whole machine is improved, and the safety, the reliability and the carrying capacity are improved, thereby a high-quality casting with a large size can be produced. The machine comprises a host machine, a main motor, a die internal temperature measuring and cooling system, a bearing temperature measuring and cooling system, a pouring system, a vibration measuring mechanism, a lubricating system, an air inducing system, a protecting system and an electrical appliance control system, wherein the host machine is installed on an equipment installation foundation in a pit; the upper end of a main shaft is provided with a die flange, and the lower end is connected with the main motor by a belt wheel and a drive belt. A pouring process curve can be arranged at will and automatically traced, and a host machine die has stepless smooth speed regulation. The machine is used for industries of steel, electricity, petroleum, nuclear engineering, and the like to cast a large roller ring, a nonferrous metal sleeve part and a special shape element.

The invention discloses a domestic photovoltaic control system which comprises a rotating frame, a solar panel, a charge-discharge controller, a storage battery and a photovoltaic inverter. The solar panel is reversibly arranged on the rotating frame, a first motor drives the rotating frame to rotate, a second motor drives the solar panel to turn over, a solar tracker is arranged at the center of the surface of the solar panel in a matching manner and controls the first motor and the second motor to work, so that the solar panel obtains the largest optical radiation orthographic area, solar energy is received by as much as possible and efficiently collected and used, a three-phase main reactor and a three-phase auxiliary reactor share a middle yoke, the sectional area of the middle yoke is specifically designed, so that the sectional area of the middle yoke can be decreased, material cost is reduced, temperature rise of the shared middle yoke can meet requirements, noise can be reduced, and overall efficiency can be improved.

The invention discloses a turbine-generator rotor adopting a sub-slot air supplying and transverse wind gap cooling mode, and belongs to the field of the generator rotor. Side edge radial air channels connected with slot wedge ventilating holes and a sub slot are formed in the two sides of a coil in a rotor wire slot respectively; transverse wind gaps, which are densely distributed in a radial direction in the coil, are connected with the side edge radial air channels in the two sides; the air flowing directions of the transverse wind gaps of adjacent pitches are opposite, and are perpendicular to the air flowing direction of the sub slot; axial air channels are formed in the straight line sections of an end part coil below each protective ring; end part slot wedge wind holes connected with the axial air channels and air gaps are formed in end part slot wedges; transverse air channels are formed in the arc sections of the end part coil; and wind blowing slots connected with the transverse air channels and the air gaps are formed in a big tooth end part. By adoption of the turbine-generator rotor with a novel ventilating structure, the problem existing in cooling of the full-speed turbine-generator rotor with single-machine power of 1,200MW or above can be solved.

The disclosed intelligent fast charger with control cabinet structure comprises: a fuzzy controller as the main, an operation panel (8) with a red lamp (6) and green lamp (7) and a display (17) and a keyboard (18), a CPU and interface module (15) arranged on the back panel (5), an isolation plate (3) with guide rail (12) on middle to hang a large-power device (13), and a control module (14) included a transformer and a rectifier diode. Wherein, all of (15), (6), (7), (17) and (18) are connected by plugging or pulling pipeline. This invention has ideal charge curve and fit to charge the direct power or standby power.

To increase the heat resistance of a film capacitor, a dielectric resin composition is used as a material for a dielectric resin film used in a film capacitor, the dielectric resin composition being cured by mixing and crosslinking two or more organic materials having functional groups that react with each other to provide a cured article. At least one pair highly cohesive atomic groups which has a molecular cohesive energy equal to or higher than that of a methyl group and capable of cohering with each other due to the molecular cohesive energy is linked to the organic material. The highly cohesive atomic groups form a cohesive portion serving as pseudo-crosslinking.

The invention discloses a high-speed digital output circuit with overcurrent protection and an integrated circuit. The high-speed digital output circuit with the overcurrent protection comprises a driving circuit, an output switch circuit, a current sensing switch circuit, an instantaneous discharge circuit and a delayed reset circuit; sampling of the current sensing switch circuit is output to currents of a load and the current sensing switch circuit is conducted when the currents exceed the protection current; the instantaneous discharge circuit starts discharging when the current sensing switch circuit is switched to be in a connecting state; the delayed reset circuit starts charging when the current sensing switch circuit is switched into a disconnection state; the driving circuit outputs a protective signal when the voltage of the instantaneous discharge circuit is lower than an overturn threshold value and receives an input level signal when the voltage of the delayed reset circuit is higher than the overturn threshold value and outputs the level signal to the output switch circuit; the output switch circuit is disconnected when receives the overcurrent protection signal to cut off the load and outputs a corresponding standard digital signal when receives the level signal. According to the high-speed digital output circuit with the overcurrent protection, overcurrent protection is achieved due to the fact that the load is cut by rapid discharging during overcurrent and repeat electrifying is controlled through slow charging.

The invention discloses a thick-film coating process for preparing a TSV three-dimensional integrated RDL electroplated mask. The technology comprises the following steps: a Ti adhesion layer and a Cu seed layer are sequentially sputtered on the surface of an insulated layer of a TSV blind hole electroplated wafer; a thick film is prepared in a mode of gluing for two times and baking for two times, a thick photoresist is coated at low speed for the first time, a thin photoresist is coated at high speed for the second time, time and temperature of the two-time baking vary according to the thickness ratio of the upper glue layer to the lower glue layer, and the ratio of the accumulated baking time of the bottom glue layer to the baking time of the surface glue layer is the thickness ratio of the two; and exposure, development and hardbaking are then carried out for preparing the RDL electroplated mask. Through adjusting parameters of two-time gluing and conditions of baking, uniformity of the thick film layer and resolution of lithography can be ensured; through strong exposure, quick development and low-temperature and long-time hardbaking, the mask which is high in precision, steep in side wall, higher in thickness and higher in uniformity can be manufactured; and the technology of the invention can be applied to RDL interconnecting wire whose electroplated layer is higher than 20mum and appearance is clear and neat.

The invention provides an electric brush for a train set grounding backflow device. The electric brush manufacturing method comprises the following steps: at a room temperature, a raw material comprising high-purity electrolytic copper powder, tin powder, zinc powder, purified graphite powder, a lubricant, copper-coated graphite fiber, nano alumina and a release agent is uniformly mixed, a premix is manufactured, the premix is subjected to pressing treatment after drying treatment, an electric brush compact is manufactured, the electric brush compact is subjected to sintering treatment, an electric brush blank is manufactured, the electric brush blank after aging treatment is subjected to an electric brush finished product processing treatment, and an electric brush finished product is obtained, wherein the lubricant selects tungsten disulfide and / or molybdenum disulfide, and the release agent is stearate. The manufactured electric brush for the train set grounding backflow device has excellent performance, the contact voltage drop between a pair of electric brushes is reduced, the working current allowed to pass is large, the harness is high, the wear rate and the friction coefficient are low, the permissible line speed is high, and operation requirements of the train set can be met completely.

The invention discloses a catalytic combustion purification process and device. According to the catalytic combustion purification process and device, firstly, organic waste gas and air and / or oxygen are mixed, and the mixing ratio of the organic waste gas and the air and / or the oxygen can be flexibly regulated and controlled according to the requirement for the subsequent catalytic combustion technology; it is guaranteed that the concentration of the organic waste gas in the mixed gas is within the explosion limit; more importantly, the subsequent catalytic combustion temperature is regulated and controlled, and the phenomenon of temperature runaway of catalytic combustion sections is eradicated; secondly, the mixed gas is divided into two parts, one part is used for catalytic combustion, and the remaining part conducts heat exchange with mixed gas at outlets of all the stages of the catalytic combustion sections. In this manner, the amount of the two parts can be regulated flexibly in time; the temperature of the mixed gas going in the next stage of catalytic combustion is maintained by using the remaining part; finally, catalytic combustion can be smoothly carried out, and the phenomenon of temperature runaway is prevented.

The invention discloses an air conditioner. The air conditioner comprises a compressor, an indoor unit casing, an evaporator, a condenser and an air guiding duct, wherein the indoor unit casing comprises a separating cavity, a first sealing cavity and a second sealing cavity; one end of the air guiding duct is connected to the separating cavity, and the other end of the air guiding duct is connected to the outside; the evaporator is arranged in the first sealing cavity; the condenser is arranged in the second sealing cavity; the separating cavity is arranged between the first sealing cavity and the second sealing cavity; a guide adjusting device is arranged in the separating cavity; when the guide adjusting device is positioned at a first position, the first sealing cavity communicates with an air ducting hose through the separating cavity and is separated from the inside; the second sealing cavity communicates with the inside through the separating cavity and is separated from the air ducting hose; when the guide adjusting device is positioned at a second position, the second sealing cavity communicates with the air ducting hose through the separating cavity and is separated from the inside; the first sealing cavity communicates with the inside through the separating cavity and is separated from the air ducting hose. According to the air conditioner disclosed by the invention, the problem that the air conditioner is greatly influenced by the outside and is poor in operation effect in the prior art can be solved.

The invention discloses a transformer copper pipe lead with an internal cooling structure. The transformer copper pipe lead comprises lead joints which are fixed at two ends of the copper pipe lead, and crepe paper which is bound in the middle of the copper pipe lead, wherein the copper pipe lead adopts the internal cooling structure; cooling oil circularly flows in the copper pipe lead; a plurality of oil inlet and outlet groove openings are respectively formed at the two ends of the copper pipe lead; binding tapes and the crepe paper are sequentially bound at the two ends of the copper pipe lead and outside the lead joints from inside to outside; a plurality of insulating cylinders are sleeved outside the crepe paper; and a plurality of supporting strips are arranged between the crepe paper and the insulating cylinders and between the two adjacent insulating cylinders. The transformer copper pipe lead has the advantages of simple structure, convenience for operation and good cooling effect, the operation reliability of a transformer is improved, the sectional area of a transformer lead can be reduced, the consumption of raw materials is reduced, the temperature of the oil can rise by the lead, and the design of a high-voltage and high-capacity transformer lead is facilitated.

The invention discloses a transformer with circulating liquid cooling function. The transformer comprises a coil and an iron core, wherein the iron core comprises a core column and an iron yoke, the coil is coaxially sleeved on the core column, the core column is fixedly connected with the iron yoke, the coil comprises a high-voltage coil and a low-voltage coil, the low-voltage coil is arranged outside the core column in a sleeving mode, the high-voltage coil is arranged outside the low-voltage coil in a sleeving mode, the transformer further comprises a plurality of cooling pipelines, the cooling pipelines are arranged in the low-voltage coil and the core column respectively, each cooling pipeline is provided with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipes are connected with a cooling liquid source, the liquid outlet pipes are connected with a liquid outlet, and cooling water enters the cooling pipelines through the liquid inlet pipes and is discharged through the liquid outlet pipes. According to the transformer, the cooling pipelines are arranged in the low-voltage coil and the core column, so that the low-voltage coil and the core column are filled with the cooling liquid, and the cooling liquid continuously and circularly flows in the cooling pipelines to effectively absorb the heat generated by the transformer in air so as to effectively cool thetransformer.

The invention relates to a high-power device heat dissipation device and method, belongs to the technical field of aerospace, and particularly relates to the technical field of heat dissipation of high-power devices on aerospace vehicles. The device and the method are matched with the layout of a printed board, a graphite heat diffusion plate is processed, and a boss is arranged in a position, corresponding to a high-power device on the printed board, on the heat diffusion plate; the printed board on which the components are welded is fixed on the frame; the distance between the top surface ofthe high-power device and the mounting surface of the heat diffusion plate is measured, the height of a heat dissipation boss of the graphite heat diffusion plate is machined according to the measured distance, when the heat conduction pad is mounted, heat conduction grease is additionally coated according to the distribution condition of the heat conduction grease on the high-power device, and heat conduction paths are increased for a heat dissipation device with a bonding pad at the belly.

The invention relates to a through-flow submersible electric pump which comprises a cylindrical pump body, an impeller and a motor, wherein the two ends of the pump body are penetrated. The motor comprises a supporting shaft. The middle of the supporting shaft is sleeved by a stator. The stator is sleeved by a rotor, namely an outer rotor structure is adopted. The two axial ends of the rotor are fixedly connected with a front end cover and a rear end cover respectively. The portion between the front end cover and the supporting shaft and the portion between the rear end cover and the supporting shaft are respectively provided with a bearing through a bearing seat. The outer side end portion of the front end cover is connected with an impeller shaft of the impeller. The impeller shaft of the impeller is a hollow shaft and sleeved on the supporting shaft in a hollow mode. The two ends of the supporting shaft are respectively fixed in the pump body and coaxial to the pump body. The outer rotor structure is adopted, a motor shell of a traditional submersible motor and a gear reducer are removed, so that manufacturing accuracy is reduced; the gear reducer and the motor shell are not required, so that the structure is compact and a large amount of manufacturing cost is saved.

A negative pressure extracting device for a vacuum boiler comprises cooling tanks and a water-collecting tank, wherein a circulatory cooling water inlet is formed in the side surface of the lower part of the corresponding cooling tank; a circulatory cooling water outlet is formed in the side surface of the upper part of the corresponding cooling tank; outlets in the bottom of the cooling tanks are connected to inlets of the water-collecting tank through pipes; and at least one spiral pipe is arranged in the cooling tanks. Heat of high-temperature media in the spiral pipes is taken away by quick circulatory flowing of the circulatory cooling water, and an extracting opening of a vacuum pump is separated from an opening of a condensate water pipe by a steam-water separating partition in the water-collecting tank while condensate water is guided by the steam-water separating partition. Because the temperature of the media is reduced in real time, and the condensate water generated during extracting is well subjected to steam, oil and water separation, the quality and the temperature of oil products of the vacuum pump are guaranteed, and the purpose of continuously extracting negative pressure in real time without stopping is achieved.

The invention discloses a novel inflatable switch cabinet in the technical field of inflatable switch cabinets, which comprises a primary switch element, the primary switch element comprises a sealing thick aluminum plate, and one side of the sealing thick aluminum plate is provided with an isolation grounding operation mechanism and a circuit breaker mechanism. A multi-station isolation grounding switch and a plurality of solid-sealed polar pole assemblies controlled by the multi-station isolation grounding switch are mounted on the other side; the isolation grounding operation mechanism can control the multi-station isolation grounding switch to be closed and grounded, a transmission mechanism and an operation mechanism are integrated on the circuit breaker mechanism, and the operation mechanism can simultaneously control the plurality of solid-sealed polar pole assembly open circuits to be closed through the transmission mechanism. According to the novel inflatable switch cabinet provided by the invention, the mechanism is directly fixed on the sealing thick aluminum plate, a transmission mechanism and an operating mechanism of the vacuum circuit breaker are integrated, a mechanism frame is cancelled, and the mechanism is directly fixed on the sealing thick aluminum plate, so that the mechanism cost of the circuit breaker is reduced.

The present invention provides a preparation method of a motor train unit earth return brush. The preparation method comprises the steps of uniformly mixing the high purity electrolytic copper powder, the tin powder, the zinc powder, the purification graphite powder, a lubricant, a copper-coated graphite fiber, the nanometer aluminum oxide and a release agent at a normal temperature to prepare a pre-mixed material, drying and then pressing the pre-mixed material to prepare a brush pressed blank, sintering the brush pressed blank to prepare a brush blank material, carrying out the brush finished product processing on the brush blank material after the aging treatment to obtain a brush finished product, wherein the lubricant is selected from tungsten sulfide and / or molybdenum disulfide, and the release agent is the stearate. According to the brush prepared by the method of the present invention, the contact voltage drop of a pair of brushes is low, an allowable working current is large, the rigidity is high, a wear rate and a friction coefficient are low, an allowable line speed is high, and the operation requirements of a motor train unit can be satisfied completely.

The invention discloses a cooling fan drive circuit and a cooking utensil. The cooling fan drive circuit comprises a current sampling circuit, a signal amplification circuit and a drive circuit body which are connected in sequence. The current sampling circuit is used for detecting real-time currents of a heating device in the heating process. The signal amplification circuit is used for conducting signal amplification on the real-time currents detected by the current sampling circuit. The drive circuit body is used for controlling the rotating speed of a cooling fan according to current signals output by the signal amplification circuit. According to the cooling fan drive circuit and the cooking utensil, the fan can be driven with the help of the current sampling signals, the number of temperature wrap sampling circuits can be decreased, MUC resource consumption is reduced, power dissipation is also reduced, and meanwhile the rotating speed of the fan can be adjusted.

To increase the heat resistance of a film capacitor, a cured article obtained by curing a mixed solution of a polyvinyl acetal having a hydroxyl group content of 10% to 38% by weight, the number of backbone carbon atoms of the polyvinyl acetal being 100 or more, and a polyisocyanate having an isocyanate content of 1% to 50% by weight is used as a dielectric resin films material arranged between first and second counter electrodes facing each other. At least the polyvinyl acetal is subjected to high-pressure homogenization in which a shearing force is applied such that a pressure applied to the polyvinyl acetal is 50 MPa or more when the material is passed through a path having a diameter of 0.125 mm and a length of 5 mm, so that the solubility is increased to allow a curing reaction to proceed uniformly. The cured article has a glass transition temperature of 130° C. or higher and a breakdown voltage of 350 V / μm or more.

The invention relates to a variable-frequency speed-regulating AC brake motor, and the motor is provided with a motor body. The center of the motor body is provided with an input shaft, and the external surface of the motor body is provided with a cooling fan. The input shaft is provided with an armature plate and an electromagnet, and a movable gap delta is disposed between the armature plate and the electromagnet. Screw rods which are connected fixedly through nuts are disposed between the armature plate and the electromagnet. A fuse nut is disposed between the screw rods, and a braking spring is disposed between the fuse nut and the armature plate. The motor is stable and reliable in low-speed operation, has no torque pulsation, can obtain a bigger starting torque under the condition of a smaller starting current, and is convenient in maintenance. The cooling fan which has independent power supply is used for forced cooling of the surface of the motor, and guarantees that the temperature rise of the motor does not exceed an allowed value when the motor is in long-time low-speed constant-torque operation. The motor is firm in installation, is good in rigidness, is flat in installation plane, cannot damage a bearing, and prolongs the service life.

The invention relates to a control method of an ethylene carbonate synthesis process. According to the invention, ethylene carbonate is synthesized through a gas-liquid-solid three-phase reaction with carbon dioxide and ethylene oxide. The method is mainly provided for solving the problems of temperature runaway and low product purity of prior arts. According to the invention, key process control indicators of the reaction are controlled with an automatic control system. A catalyst is fixed with porous baffles in a reaction bed layer. Liquid-phase and gas-phase raw materials respectively enter from the upper part and the lower part of the reactor. Catalyst bed layer temperature rise in the reactor is controlled with outer circulation material flow, such that the bed layer temperature rise is controlled within a certain range. Product purity is controlled with secondary reactor outlet liquid phase output amount. With the technical scheme, the problems are well solved. The method can be applied in industrial productions of ethylene carbonate synthesis.

The invention relates to a high precision adjustable automatic constant temperature test system for a pump and belongs to the pump production technology field. The system comprises a liquid storage case, test medium, a temperature rising device, a cooling device, a compulsory convection device, a temperature measurement and analysis system, a temperature acquisition and control system, a pump inlet pipeline and a pump outlet pipeline, wherein the test medium is stored in the liquid storage case, the temperature rising device, the cooling device, the compulsory convection device, temperature sensors, the pump inlet pipeline and the pump outlet pipeline are mounted on the liquid storage case, the temperature rising device is mounted at the lower portion of the inner side of the liquid storage case, the cooling device is mounted at the upper portion of the inner side of the liquid storage case, the temperature measurement and analysis system is a sensor, the compulsory convection device is mounted at the bottom portion of the inner side of the liquid storage case, the temperature sensors are respectively mounted on the pump inlet pipeline, the upper portion of the temperature rising device and the lower portion of the cooling device, and the temperature acquisition and control system is for control. The system has advantages of high precision, high automation degree, long medium service life and wide market prospects.