250 results about "Liquid nitrogen cooling" patented technology

This invention relates to the field of battery testing technology and discloses an ice-water impact testing system, comprising: a temperature control unit for regulating the temperature of the testing environment, the temperature control unit including a liquid nitrogen cooling device and an electric heating device, and using a PID algorithm to regulate temperature fluctuations within ±0.5℃; an impact unit for simulating water flow impact and mechanical vibration of battery samples during testing, the impact unit including a high-pressure water pump and a mechanical vibration device, capable of adjusting water flow pressure and vibration acceleration; and a data acquisition and analysis module for real-time acquisition of temperature, humidity, pressure, and battery voltage data during the testing process, and evaluating battery performance through intelligent analysis algorithms. By combining the liquid nitrogen cooling device and the electric heating device, and employing a PID control algorithm, precise adjustment of the temperature control unit is achieved, enabling rapid temperature switching within the range of -40℃ to 80℃, while maintaining temperature fluctuations within ±0.5℃.

The invention provides an energy-saving electrical equipment control cabinet, which belongs to the technical field of electric control cabinet cooling, and comprises a cabinet body, a circulating cooling assembly, a trigger cooling assembly and an electromagnetic reset assembly, the temperature sensor monitors the temperature of the cabinet body in real time and cooperates with the circulating fan and the exhaust fan to realize energy-saving heat dissipation control; the high-heat-conduction particles ensure that the high heat conduction performance can be maintained under different working conditions, even if the environment temperature or the air flowing state is changed, heat can still be transferred, and the heat dissipation effect is ensured; the trigger cooling assembly controls liquid nitrogen release according to the temperature of the cabinet body, automatically triggers liquid nitrogen cooling when the temperature rises to a certain degree, and automatically stops after the temperature is reduced, so that liquid nitrogen is prevented from being excessively used, and an expected heat dissipation effect can be achieved even if the external temperature is relatively high; liquid nitrogen and air are promoted to be fully mixed through the spiral blades, meanwhile, gas-liquid separation can be promoted, a stable low-temperature operation environment is provided for electrical equipment, and damage to the equipment due to too high temperature and moisture is reduced.

The invention discloses beryllium copper plate calendaring forming equipment, and relates to the technical field of beryllium copper plate manufacturing, and the beryllium copper plate calendaring forming equipment comprises a rack, a transmission assembly, a cleaning assembly and a driving guide assembly. A multi-layer composite calendering roller structure is adopted, an outer tungsten carbide wear-resisting layer is matched with a middle copper-aluminum alloy heat conduction layer and a 42CrMo alloy steel support layer, a dynamic temperature control system is formed under the synergistic effect of a spiral heating channel, a spiral cooling channel, a microwave heating tank and a liquid nitrogen cooling tank, the forming precision and the material performance are remarkably improved, and the service life of the calendering roller is prolonged. A transmission assembly, an automatic cleaning assembly on the inner wall of the rack and driving guide assemblies at the two ends are externally arranged, the rolling stability is guaranteed, the position of the beryllium copper plate can be adjusted in real time, the intelligent control platform integrates the multispectral monitoring and touch control adjusting functions, closed-loop optimization of thermal parameters is achieved through a temperature control unit, and the working efficiency is improved. And therefore, the equipment has high-efficiency forming, intelligent monitoring and process self-adaptive capabilities in the machining process.

A method for friction stir processing of an end surface of an age-hardening aluminum alloy plate is provided, in which a solid-solution state age-hardening aluminum alloy plate is butt-joined to and clamped with a dissimilar plate to obtain a combined plate; two sides of the combined plate are respectively provided with a weld-start plate and a lead-out plate; a bottom end of a stirring head is provided with a stirring pin; a distance between the outer edge of the stirring pin and the end surface of the age-hardening aluminum alloy plate is maintained to be 0.01-5 mm; the stirring pin is rotated into the weld-start plate; the age-hardening aluminum alloy plate is subjected to friction stir processing underwater or in a liquid nitrogen cooling condition; and the processed age-hardening aluminum alloy plate is separated and subjected to aging treatment.

The invention discloses a waste crushing device for plastic tableware production, and belongs to the technical field of tableware production, the waste crushing device comprises a main body module, a low-temperature magnetic suction module and a crushing module, the main body module comprises a device shell, the outer surface of the device shell is connected with a protective shell, and the top of the device shell is provided with a feeding hopper; a partition plate is fixedly connected to the interior of the device shell, a collecting box is movably connected to the lower portion of the rear end face of the device shell, and through arrangement of a conveying assembly, a neodymium iron boron magnetic strip, a cooling assembly, a turning assembly, a liquid nitrogen assembly and an air supply assembly, the liquid nitrogen assembly is matched with the cooling assembly, so that melamine tableware is rapidly embrittled, and follow-up smashing is facilitated; meanwhile, the air supply assembly is matched with the cooling assembly to cool the neodymium-iron-boron magnetic strip, the magnetic attraction effect of the neodymium-iron-boron magnetic strip is improved by 20%-50%, and the waste treatment efficiency and the equipment safety are remarkably improved through the cooperation mode of liquid nitrogen cooling and magnetic attraction enhancement.

The invention relates to the field of liquefied natural gas, in particular to a liquefied natural gas double-layer tank liquid nitrogen circulation cooling and fire extinguishing system and method. The system comprises a double-layer tank body, a liquid nitrogen cooling and fire extinguishing assembly and a liquid nitrogen collecting and circulating assembly, the double-layer tank body comprises an inner tank body and an outer tank body, the inner tank body is located in the outer tank body and provided with a temperature sensor, and a plurality of superconducting magnetic suspension supporting modules are arranged between the outer tank body and the inner tank body; the liquid nitrogen cooling and fire extinguishing assembly comprises a liquid nitrogen storage tank and a liquid nitrogen circulating main pipe, the liquid nitrogen circulating main pipe communicates with the liquid nitrogen storage tank and is spirally wound on the peripheral wall of the inner tank body, and a plurality of exhaust holes are formed in the part, located in the cavity, of the liquid nitrogen circulating main pipe in the extending direction; the liquid nitrogen collecting and circulating assembly comprises a loop pipe, a liquid nitrogen collecting tank and a circulating pipe, the loop pipe communicates with the cavity and the liquid nitrogen collecting tank and is further connected with an air suction pump and a cooling and pressurizing device in series, and the circulating pipe communicates with the liquid nitrogen collecting tank. The inner tank body can be rapidly and comprehensively cooled, and a fire can be rapidly extinguished when the fire occurs.

The invention discloses a hydraulic clamping device for an alloy pipe cutting machine, and relates to the technical field of hydraulic press device control, the hydraulic clamping device comprises a base, a liquid nitrogen cooling module, a magnetic suspension control module and a safety detection module, the liquid nitrogen cooling module is installed on the side face of the outer wall of the base, and the liquid nitrogen cooling module is connected with a liquid nitrogen cooling interlayer through a polyethylene pipe; the liquid nitrogen cooling interlayer is used for cooling the hydraulic clamping device, and the liquid nitrogen cooling module comprises a converter, a condenser pipe, a liquid nitrogen barrel and a liquid nitrogen pressure gauge. By installing the liquid nitrogen cooling module, the problems that conventional water cooling of a hydraulic clamping device consumes time and labor, the cooling effect is poor, the service life of the device is short, pipe loss is serious, and the working efficiency is low are solved.

The invention belongs to the technical field of plate forming, and particularly relates to a forming method and device for an ultra-deep aluminum-lithium alloy complex thin-wall bent part. Comprising the following steps: determining the position of an easy-to-crack part of the ultra-deep aluminum-lithium alloy complex thin-wall curved part through analogue simulation in a forming process; the method comprises the following steps: pretreating an aluminum-lithium alloy plate, and then carrying out solid solution quenching treatment on the plate; arranging a liquid nitrogen cooling pipeline in the forming device according to the position of an easy-to-crack part of the ultra-deep aluminum-lithium alloy complex thin-wall curved part; the aluminum-lithium alloy plate subjected to solid solution quenching treatment is placed in a forming device, liquid nitrogen is sprayed to the easy-to-crack portion of the aluminum-lithium alloy plate through a liquid nitrogen cooling pipeline for liquid nitrogen cooling, blank holder force is kept to be applied to the aluminum-lithium alloy plate in the liquid nitrogen cooling process, and a thin-wall bent part preformed blank is obtained after forming; and aging heat treatment is conducted on the thin-wall curved part preformed blank, and the ultra-deep aluminum-lithium alloy complex thin-wall curved part is obtained. By means of the method and device, high-efficiency, low-cost and high-precision forming can be achieved.

The invention relates to the technical field of metro tunnel shield construction, in particular to a microwave high temperature-liquid nitrogen cooling metro shield boulder treatment device and method.The device comprises a cutter head body system, a microwave thermal damage system and a liquid nitrogen cold impact system; a hard boulder is pretreated through a microwave high temperature-liquid nitrogen cooling technology, that is, firstly, holes are drilled in the boulder, then a microwave generator of a microwave thermal damage system is placed in the boulder holes to spread microwave energy, the thermal expansion difference occurs to mineral particles in the boulder under the microwave high temperature effect, and therefore microcracks are generated; and then, liquid nitrogen cold impact is used for further promoting the cracks to extend and communicate, so that the overall strength of the boulder is reduced, and the internal structure of the boulder can be effectively damaged through the hot-cold alternating effect. And finally, after strength evaluation is suitable for tunneling, a shield cutter head is started for operation.

The invention discloses a high-temperature superconducting high-intensity magnetic field homogenization heat treatment method and device for a large-size titanium alloy ingot blank. The adopted device comprises a heating main body structure, a driving assembly, a temperature monitoring and control system and a cooling system. The heating main body structure comprises a supporting frame, an ingot blank rotating clamp, a superconducting coil and an adjustable magnetic core, and the ingot blank rotating clamp is connected with the driving assembly; a temperature monitoring assembly and a control system are arranged outside the ingot blank; the cooling system adopts a liquid nitrogen cooling mode to guarantee stable operation of the superconducting coil. Compared with a traditional titanium alloy heating method, the equipment efficiency can be improved by 82% through the homogenization heat treatment, the heating time is greatly shortened, and the production efficiency is improved. The axial temperature error of the titanium alloy ingot blank can be controlled within + / -3 DEG C, the structure property difference is effectively reduced, and the product quality is improved. The heating depth is increased through low-frequency heating, multiple temperature control modes are achieved in cooperation with a temperature monitoring and control system, and high industrial application value is achieved.

The invention discloses a liquid nitrogen cooling and laser heating collaborative auxiliary cutting device and a cutting method thereof. The device comprises a laser heating system, a liquid nitrogen cooling system, a cutting system, a tool temperature monitoring system and a control system. Laser emitted by the laser heating system is focused on a to-be-machined area of a workpiece in front of a cutting edge after transmitting through the cutter body; the liquid nitrogen cooling system accurately sprays liquid nitrogen to the cutting edge area of the tool through a heat insulation liquid supply pipeline and a nozzle which are integrated in the tool rest. The control system dynamically and synergistically adjusts the laser output power and the liquid nitrogen injection flow based on a temperature signal sent by a thermocouple embedded in the cutter. According to the device, parallelism of the two processes of laser heating of a workpiece and liquid nitrogen cooling of a tool is achieved in space, dynamic matching and accurate balance of laser heating and liquid nitrogen cooling are achieved in time, and the problems that in laser-assisted cutting, the tool is prone to thermal damage, the cooling efficiency is low, and a thermal field is out of control are effectively solved.

The invention relates to the technical field of ceramic aerogel, in particular to hydroxyapatite biological ceramic aerogel with a directional hole structure as well as a preparation method and application of the hydroxyapatite biological ceramic aerogel. The preparation method comprises the following steps: firstly, adding hydroxyapatite particles, a sintering aid and a binder into a water solvent according to a certain mass ratio to prepare aerogel ink; and secondly, filling the ink into an extrusion needle tube of a direct-writing 3D printing technology, and carrying out customized printing on hydroxyapatite aerogel on a liquid nitrogen cooled copper plate by adopting an ice template method as an assistance. After freeze drying and sintering, the biological ceramic aerogel with the directional hole structure on the micro scale is finally obtained. The oriented pore biological ceramic aerogel has excellent mechanical properties and biocompatibility, and has good prospects in the fields of biological scaffolds, bone tissue engineering, biosensor substrates and the like. The method for preparing the hydroxyapatite biological ceramic aerogel by using the ice template method to assist the 3D printing technology is low in cost, simple to operate and wide in application range, and has great application potential.

The utility model discloses a liquid nitrogen cryogenic recovery system for truck loading waste gas, and relates to the technical field of waste gas. According to the technical scheme, the device comprises a first feeding and discharging heat exchanger, a second feeding and discharging heat exchanger, a first secondary cooler, a second secondary cooler, a first liquid nitrogen cooler and a second liquid nitrogen cooler; a tube pass feeding hole of the liquid nitrogen cooler I and a tube pass feeding hole of the liquid nitrogen cooler II are connected with a liquid nitrogen feeding pipeline and a low-temperature nitrogen feeding pipeline, a valve I and a valve II are arranged on the liquid nitrogen feeding pipeline, and a valve III and a valve IV are arranged on the low-temperature nitrogen feeding pipeline; a valve V and a valve VI are respectively arranged on tube pass discharging pipelines of the liquid nitrogen cooler I and the liquid nitrogen cooler II; and a valve VII and a valve VIII are respectively arranged on nitrogen discharging pipelines of the liquid nitrogen cooler I and the liquid nitrogen cooler II. When the liquid nitrogen coolers are switched, the standby liquid nitrogen coolers are subjected to precooling and subzero treatment, so that the standby liquid nitrogen coolers can reach the use temperature after being switched, and the effective treatment of loading waste gas and the stable operation of the system are ensured.

The vacuum brazing process comprises the steps that an alloy substrate and fins are placed in a liquid nitrogen cooling environment to be subjected to graphene deposition treatment, then silver-based brazing filler metal is deposited, pulse airflow is introduced every preset period to disturb brazing filler metal atoms, the alloy substrate and the fins are placed in an alignment clamp, and alignment treatment is conducted on a crystal nucleus substrate and the fins; brazing is controlled to be started in a vacuum brazing furnace, interface bonding of graphene and brazing filler metal is promoted, and an initial brazing assembly is formed; the initial brazing assembly is subjected to annealing treatment, vibration is applied to the initial brazing assembly in the annealing process, and an optimized brazing assembly is obtained; and under the inert atmosphere, a diamond-like carbon film is deposited on the surface of the optimized brazing assembly, and the heat dissipation assembly is obtained. The interface bonding strength and the heat conduction efficiency are remarkably improved, the heat dissipation requirement of a high-power-density electronic device is met, the service life of the device is effectively prolonged, and the working stability of the device is improved.

The invention discloses a liquid nitrogen cold supply energy-saving device for krypton and xenon separation and purification. The liquid nitrogen cold supply energy-saving device comprises a liquid nitrogen supply unit, a low-temperature nitrogen supply unit, a first rectifying tower, a liquid nitrogen gasification tank, a low-temperature nitrogen buffer tank, a second rectifying tower and a tail gas emission unit. The liquid nitrogen supply unit supplies liquid nitrogen to the first rectifying tower and the liquid nitrogen gasification tank through two-way adjustment, low-temperature nitrogen generated by the first rectifying tower is divided and then partially enters the liquid nitrogen gasification tank to be adjusted, and gasified nitrogen is subjected to pressure stabilization through the low-temperature nitrogen buffer tank and then serves as an auxiliary cold source of the second rectifying tower. And gradient utilization of cooling capacity is realized through a multi-stage regulating valve. According to the device, low-temperature nitrogen discharged by the rectifying tower is subjected to secondary recycling innovatively, an auxiliary cold source system is constructed through the low-temperature nitrogen buffer tank, and liquid nitrogen consumption is effectively reduced; discharged low-temperature nitrogen is recycled, and loss of liquid nitrogen is reduced.

The invention provides an electronic-grade mixed gas distribution device and an operation method thereof. The method sequentially comprises the steps of pipeline replacement, quantitative filling of component gas, quantitative filling of balance gas, mixed gas detection and raw material recovery. According to the invention, the mixing efficiency of the mixed gas and the safety coefficient in the mixing process can be effectively improved; according to the invention, the quality of the electronic-grade mixed gas can be improved. The recovery gas cylinder in the gas distribution device can serve as a buffer device, safe recovery of gas can be guaranteed after liquid nitrogen is cooled, recovery of flammable and explosive gas is particularly facilitated, and production cost is saved.

The invention discloses a steel coil high-temperature annealing sealing sand magnetic separation recycling method which comprises the following steps: caked sealing sand is coarsely crushed, uncaked raw sand grains and caked mixed materials are screened and separated, and the caked mixed materials comprise undissociated raw sand grains, glass phase coating bodies and sintered aggregates; microwave heating and liquid nitrogen cooling are combined to treat the caked mixture, so that a glass phase coating body is subjected to targeted fracture, and loose particles and undissociated blocks are separated through airflow separation; the loose particles directly adsorb free iron oxide through first-stage magnetic separation, and then enter second-stage magnetic separation, and weak magnetic iron oxide is separated through combination of dynamic fluidization separation and magnetofluid enhancement; the undissociated blocks are subjected to acid pickling dissociation, and a glass phase and undamaged raw sand grains are separated through electric field separation; and surface melting and cooling forming are conducted on the loose particles and undamaged original sand grains, and the roundness of the sand grains is recovered. Efficient purification and cyclic utilization of the sealing sand are achieved, and the magnetic separation efficiency and the sand grain quality are remarkably improved.

The invention discloses a liquid nitrogen-liquid carbon dioxide combined stratum freezing system which comprises a liquid carbon dioxide freezing mechanism and a liquid nitrogen cooling mechanism, the liquid carbon dioxide freezing mechanism comprises a carbon dioxide circulating pipeline, and a liquid nitrogen structure comprises a nitrogen storage tank, a liquid nitrogen conveying pipe and an exhaust pipe which are connected and matched with one another. The control device can control the liquid nitrogen cooling mechanism to work and convey liquid nitrogen into the freezing pipe so that the stratum can be rapidly cooled, and then control the liquid carbon dioxide freezing mechanism to work and convey liquid carbon dioxide into the freezing pipe so that the carbon dioxide can be recycled so that the stratum can be rapidly frozen. Therefore, the liquid carbon dioxide freezing mechanism and the liquid nitrogen cooling mechanism are combined to cool and freeze the stratum, the cooling and freezing efficiency can be effectively improved, and meanwhile the cost of freezing by independently using liquid nitrogen is reduced.

The invention discloses a multi-field coupling transmission electron microscope in-situ sample rod and a bidirectional accurate temperature and electromagnetic field control system method thereof, and belongs to the field of transmission electron microscopes. The rod head of the sample rod comprises an objective table, a micro U-shaped electromagnet and a PCB (Printed Circuit Board) which are arranged in the objective table, a temperature conducting plate and a liquid nitrogen circulating pipe which are arranged at the rear end of the objective table, and a four-electrode MEMS (Micro Electro Mechanical System) thermoelectric chip arranged on the objective table. Dual control of heating and an electric field is realized through the MEMS thermoelectric chip, and bidirectional temperature adjustment of a sample is realized in combination with a liquid nitrogen cooling system. And meanwhile, the sample rod is also integrated with a micro U-shaped electromagnet to apply a controllable parallel magnetic field. The whole system can carry out multi-field coupling experiments under extreme conditions, such as dynamic researches of electricity, magnetism, phase change and the like.

The utility model provides a synthetic tail gas separation device based on a liquid nitrogen washing mode. The tail gas separation device comprises a TSA adsorption unit, a liquefaction separation unit, a mixed refrigeration circulation unit, a nitrogen circulation unit and a natural gas storage unit, the input end of the TSA adsorption unit is connected with the liquefaction separation unit; the output end of the liquefaction separation unit is respectively connected with the nitrogen-rich out-of-bound area, the hydrogen-rich out-of-bound area and the natural gas storage unit; the mixed refrigeration cycle unit and the nitrogen cycle unit are connected in parallel with the liquefaction separation unit; one path of the output end of the cold box is connected with the dehydrogenation tower; one path of the output end of the dehydrogenation tower is connected with a hydrogen-rich gas outlet area through a cold box; the other path is connected with the denitrification tower; one path of the output end of the denitrification tower is connected with the nitrogen-rich gas out-of-bound area through the return tank and the cold box in sequence; the other path of the output end of the cold box is connected with a liquid nitrogen cooling device through a liquid nitrogen flash tank and a liquid nitrogen booster pump in sequence; according to the device, a mixed refrigerant and liquid nitrogen are used as refrigerating media, and hydrogen-rich gas, nitrogen-rich gas and liquefied natural gas are obtained by separating synthetic tail gas through rectification.

The utility model relates to a liquid nitrogen cooling immersed server heat dissipation system, which comprises a liquid nitrogen storage and supply system, a liquid nitrogen conveying system, a cooling system, a nitrogen discharge system and a control system which are connected with one another through pipelines, one end of the liquid nitrogen storage and supply system is connected to an external tank car unloading port, and the other end of the liquid nitrogen conveying system is connected to an external tank car unloading port. The other end of the liquid nitrogen storage and supply system is connected with the cooling system through the liquid nitrogen conveying system, the cooling system is connected with the nitrogen discharging system to discharge nitrogen, and the liquid nitrogen storage and supply system, the liquid nitrogen conveying system, the cooling system and the nitrogen discharging system are all controlled by the control system. The device has the advantages of being simple and reasonable in structure, convenient to install and use, safe, efficient, energy-saving, environment-friendly and the like.

The invention relates to the technical field of medical materials, and particularly discloses a preparation process of a nickel-titanium-based shape memory alloy micro flat filament, which comprises the following steps: S1, pickling and polishing a nickel-titanium-based composite material, heating under the protection of inert gas, and repeatedly annealing and cold-drawing until the filament diameter is 0.1 mm; the annealing temperature is 650-750 DEG C, and the deformation of each heating number of cold drawing is 30-40%; s2, a wire with the wire diameter of 0.1 mm is polished, then the temperature is increased under inert gas protection, and annealing and cold drawing are repeatedly conducted till the wire diameter ranges from 0.03 mm to 0.08 mm; the annealing temperature is 600-700 DEG C, and the deformation of each heating number of cold drawing is 35-48%; and S3, the blank obtained in the S2 is rolled under liquid nitrogen cooling, and the micro flat filaments are obtained. According to the preparation technology of the nickel-titanium-based shape memory alloy micro flat wire, the micro flat wire which is high in size precision and excellent in mechanical property and fatigue property and has the developing function can be prepared.

The invention provides a continuous and accurate temperature measurement and fire extinguishing robot system for a coal pile and a using method of the continuous and accurate temperature measurement and fire extinguishing robot system. The continuous and accurate temperature measurement and fire extinguishing robot system comprises an unmanned aerial vehicle infrared temperature measurement imager, the unmanned aerial vehicle infrared temperature measurement imager, the crawler-type intelligent mobile robot and the insertion type temperature measurement fire extinguishing rod are connected with the coal yard stacking spontaneous combustion prevention temperature monitoring and alarming system, and continuous and accurate monitoring, automatic early warning and rapid fire extinguishing treatment of the surface temperature and the deep layer temperature of a coal pile can be achieved. A three-dimensional model is formed by scanning a coal pile through an unmanned aerial vehicle; the temperature-measuring fire-extinguishing rod controls the insertion depth of the screw according to temperature sensing; the temperature-measuring fire-extinguishing rod releases liquid nitrogen according to an instruction issued by the system; the coal yard spontaneous combustion prevention temperature monitoring and alarming system is constructed, and the functions of accurate and rapid temperature measurement of a coal pile, remote monitoring of the temperature of the coal pile, overtemperature release of liquid nitrogen for cooling and the like are achieved. Compared with traditional on-site temperature measurement, coal pile safety management work is better facilitated, and potential safety hazard checking is enhanced.

The utility model relates to the technical field of color paste cooling, and particularly discloses a color paste cooling constant temperature device which comprises a box body, a feeding port is formed in the upper end of the box body and fixedly connected with the box body, and a material guide pipe is arranged below the feeding port and located in the box body; the bracket is positioned below the box body and is fixedly connected with the box body; the controller is located on the right side of the box body; the cold water circulation mechanism is located on the left side of the box body, and the cold water circulation mechanism can reduce the temperature of the color paste in the box body; the liquid nitrogen cooling mechanism is located on the right side of the box body, the liquid nitrogen cooling mechanism can achieve a remarkable compensation cooling effect, efficient cooling of color paste is achieved under the combined action of the cold water circulation mechanism and the liquid nitrogen cooling mechanism, the color paste can be evenly acted, and the cooling efficiency is improved by combining the two modes of cold water circulation and liquid nitrogen cooling. The cooling intensity can be flexibly adjusted according to production requirements, and the cooling requirements of different color pastes are met.

The application discloses a method for eliminating water stain defects of micro-channel aluminum flat tubes, and the continuously extruded micro-channel aluminum flat tube is cooled through a liquid nitrogen cooling box after being treated by zinc spraying, and then is wound on a winding drum. The method adopts the liquid nitrogen cooling mode to replace the traditional water cooling, so that the water stain defects caused by water cooling can be completely avoided, and the product yield and the product qualification rate are improved.

According to the present invention fragmented material 2, e.g. made from a material having Polyamides, is passing through a liquid bath 6 filled with liquid nitrogen 7 to cool the fragmented material 2 before entering a mill 10 for grinding the fragmented material 2. The fragmented material 2 is moved through the liquid bath 6 by exciting mechanical vibrations in the liquid bath 6 e.g. by a vibrational motor 28 coupled to the liquid bath 6 and / or an ultrasonic resonator 26 attached to the liquid bath 6. The invention allows to grind even materials being difficult to grind by reaching a temperature of −150° C. and less before entering the mill 10 while avoiding a direct cooling e.g, by introducing liquid nitrogen directly into the mill 10.

The invention provides a double-refrigeration device applied to high-temperature superconducting magnetic fluid propulsion, and relates to the technical field of high-temperature superconducting magnet cooling, the device comprises a magnet Dewar, a magnet liquid nitrogen cylinder, a fixing assembly and a conduction refrigeration system; the magnet liquid nitrogen cylinder is located in the magnet Dewar, one end of the fixing assembly is fixed to the side portion of the magnet liquid nitrogen cylinder, and the other end of the fixing assembly is fixed to the magnet Dewar; dewar protrusions are arranged on the circumferential side wall of the magnet Dewar, and the conduction refrigeration system is installed on the Dewar protrusions and exchanges heat with the superconducting magnet coil in the magnet liquid nitrogen cylinder. The superconducting magnet coil is also provided with a wiring port. The dual-refrigeration device provided by the invention breaks through the dilemma that the critical current cannot be tested after packaging, the liquid nitrogen cooling unit can independently, quickly and uniformly cool the packaged magnet, and the detachable sealing wiring port is arranged, so that the performance verification after packaging is realized, and the quality blind area is eliminated.

The utility model discloses a granulating device for waste pipe fitting processing, which relates to the technical field of waste pipe fitting processing, and comprises an L-shaped base, one end of the top of the L-shaped base is fixedly connected with a supporting clamping seat, the supporting clamping seat is connected with an extruder device in a clamping manner, the top of the L-shaped base is fixedly connected with a cutting bin, and the cutting bin is fixedly connected with a conveying device. The side wall of one end of the L-shaped base is fixedly connected with a cooling bin, the cooling bin corresponds to the extruder device and the cutting bin in position, and the side wall of the cooling bin is fixedly connected with a liquid nitrogen cooling jacket device. The L-shaped base provided by the utility model is convenient to cut and granulate on the basis of quickly cooling a solution produced by smelting a waste pipe fitting after bracing, so that the problem that the existing granulating device for processing the waste pipe fitting cannot quickly cool and shape a plastic bracing produced by an extrusion mechanism when in use is solved; and a worker needs to pull into cooling water for shaping to carry out pelletizing in the next step, so that the pelletizing working efficiency is influenced.

The utility model relates to the technical field of pipeline maintenance, in particular to a liquid nitrogen intercepting system which comprises a fluid pipeline, a liquid nitrogen bottle, a liquid nitrogen pipeline connected with the liquid nitrogen bottle and a control device. The middle section of the liquid nitrogen pipeline is a bent pipeline arranged around the fluid pipeline in an embracing mode, the bent pipeline comprises a plurality of C-shaped pipelines which are sequentially arranged from top to bottom, arc-shaped connectors used for connection are arranged between the head ends and the tail ends of every two adjacent C-shaped pipelines, and gaps are reserved between the arc-shaped connectors at the head ends and the tail ends of the C-shaped pipelines; a first temperature sensor is fixedly arranged at the installation position, corresponding to the bent pipeline in the liquid nitrogen pipeline, of the fluid pipeline, and a second temperature sensor is fixedly arranged at the outlet position of the liquid nitrogen pipeline; according to the scheme, the technical problem that the fluid freezing efficiency of an existing liquid nitrogen cooling system is not high can be solved.

The invention discloses an ABS plastic part low-temperature metallization vacuum coating process and equipment. The equipment comprises a machine body, a coating tank is embedded in the machine body, a side plate is fixedly installed at the upper end of the machine body, a storage rack is movably installed in the coating tank, an operation ring is movably installed in the coating tank, and the side face of the operation ring is movably connected with a threaded rod through threads. The stable coating equipment is arranged, a plastic part is placed in a storage rack in the vacuum coating equipment, a plasma cleaning opening in the upper end of an operation ring is used for cleaning the surface of the plastic part and removing grease and impurities on the surface, and a temperature controller is installed in the equipment and used for controlling the internal temperature; when the temperature is too high, the liquid nitrogen cooling system is used for cooling, the high-power pulse magnetron sputtering device mounted at the upper end of the operation ring is used for coating a plastic part and depositing a metal layer, finally, ultraviolet curing treatment is performed, and meanwhile, the high-power pulse magnetron sputtering technology is adopted, so that the pollution to the environment is reduced, and the coating precision is improved.