172results about How to "Double protection" patented technology

The invention describes a device for a self-service terminal which contains a card reading device, for preventing the possibility of data on a card which is to be read by the card reading device 10 being spied-out by means of a spying-out apparatus which is installed in the vicinity of the card reading device 10. The device comprises a protection apparatus 26 for generating a protective electromagnetic field which is suitable for impairing the functioning of the spying-out apparatus. The protection apparatus is controlled by a control unit 24 of the card reading device, which control unit also controls a card transportation apparatus 18 and / or a reading apparatus 20, 22 of the card reading device, such that the protective field is changed during reading of the card in the card reading device 10 such that it is ensured that reading of the card in the card reading device 10 is not impaired.

The invention provides a direct-current input end inverted connection protecting circuit. The direct-current input end inverted connection protecting circuit comprises a controllable disconnection accessory, a voltage detecting unit and a control unit, wherein the controllable disconnection accessory is connected between a direct-current input end and a rear-stage circuit; the voltage detecting unit is connected between a positive pole and a negative pole of the direct-current input end in parallel, and is used for detecting voltage signals between the positive pole and the negative pole of the direct-current input end and transmitting a detection result to the control unit; and the control unit is respectively connected with the voltage detecting unit and the controllable disconnection accessory, is used for judging whether the positive pole and the negative pole of the direct-current input end are in inverted connection or not according to the detection result of the voltage detecting unit, controls the controllable disconnection accessory to perform disconnection if the positive pole and the negative pole of the direct-current input end are in inverted connection, and controls the controllable disconnection accessory to perform connection if the positive pole and the negative pole of the direct-current input end are connected with each other correctly. Correspondingly, the invention provides direct-current input equipment and a direct-current input end inverted connection protecting method. Compared with the prior art, the direct-current input end inverted connection protecting circuit has the advantages that the cost can be reduced, and the power consumption of a system can also be reduced.

The invention relates to the field of slope reinforcement and surrounding rock support control of underground engineering, disclosing an arrow anchor rod of multi-section clamping grouting anchoring,which comprises a sleeve (5), a grouting rod body device and a sealing device, wherein the grouting rod body device is arranged in the sleeve (5); the grouting rod body device comprises a grouting rodbody (7) and a plurality of groups of anchor heads (6); each group of anchor heads (6) forms a clamping anchoring structure and are connected to the outer wall of the grouting rod body (7) in hinge mode; the sleeve (5) is provided with a slotted hole (5002) which is in one-to-one correspondence with the anchor head (6) and suitable for the anchor head (6) to pass; the anchor head (6) is guided into the rock mass along the slotted hole (5002) by the external force of propelling grouting rod body device; a sealing structure is formed between the sleeve (5) and the grouting rod body device by utilizing a sealing device and is fixed on the rock wall (9). By adopting the technical innovation of the arrow anchor rod of multi-section clamping grouting anchoring, continuous high-resistance and high-strength working resistance can be provided timely and efficiently, so that the long-term stability of the engineering geotechnical mass maintenance under the environment of high stress or strong power disturbance can be truly achieved.

The invention provides a dehydration device for natural gas. The dehydration device comprises a dehydration part and a drainage part, wherein the dehydration part comprises a first cylinder and a second cylinder, a wet gas inlet is formed in the side wall of the first cylinder, a gas-water guide pipe is arranged in the first cylinder in a penetrating manner, and a gas passing hole communicated with the wet gas inlet penetrates through the side wall of the gas-water guide pipe; the second cylinder is connected above the first cylinder in a sealed manner, a cylindrical water filter film is arranged in the second cylinder, an inner cavity of the water filter film is communicated with the gas-water guide pipe, and a first dry gas outlet is formed in the side wall of the second cylinder; the drainage part comprises a water-gas shunt pipe, the upper end of the water-gas shunt pipe is connected with the lower end of the gas-water guide pipe in a sealed manner, the lower end of the water-gas shunt pipe is connected with an upper valve, a water containing chamber is arranged in the water-gas shunt pipe, and an upper floating ball is arranged at the lower part of the water containing chamber and connected with the upper valve. The water filter film is used for filtering and dehydrating wet natural gas, the defect that dehydration cannot be effectively performed at the high air temperature in the prior art is overcome, and automatic dehydration and automatic drainage are realized around the clock all the year round.

The invention relates to a federated learning-based credit card transaction risk prediction method, and the method comprises the following steps: 1) obtaining a data set about client credit card transaction feature data in each bank serving as different local clients; 2) searching similar instances in each bank data set by adopting a locality sensitive hash algorithm; 3) constructing combined features by adopting a GBDT algorithm in a serial federated learning environment; 4) constructing a new training feature according to the combined feature and the original feature, and expanding and constructing a new data set by each local client; 5) enabling each local client to adopt the same neural network model for training, uploading the trained model parameters to the cloud, and enabling the cloud to aggregate and update the model parameters and returns the model parameters to each local client to start the next training until the training process converges, so that the final neural networkmodel is obtained to complete a credit card transaction risk prediction result. Compared with the prior art, the method has the advantages of privacy protection, accurate result, wide application range and the like.

The invention provides a gantry type three-dimensional five-axis laser cutting machine. A laser device and a machine tool rack are included. A laser protection room, a three-dimensional laser cuttinghead, an xyz three-axis platform driving the three-dimensional laser cutting head and a rotation workbench provided with a to-be-cut workpiece are included. The three-dimensional laser cutting head comprises a rotation shaft C axis which is arranged on the xyz three-axis platform and controls a light emitting component, and a swinging shaft A axis which is arranged on the xyz three-axis platform and controls the light emitting component. The xyz three-axis platform is arranged on the machine tool rack. The rotation workbench is arranged on one side of the machine tool rack. The machine tool rack is located on the inner side of the laser protection room. At least part of the rotation workbench is located on the outer side of the laser protection room. An installing device is further arranged on the outer side of the laser protection room. The outer side is provided with the laser protection room, the rotation workbench horizontally rotates by 180 degrees so that the to-be-cut workpiececan be rapidly conveyed to the laser cutting position, the dual protection function is achieved for the exposed rotation workbench through a safety light curtain assembly and safety radar, and accidents are avoided.

The invention relates to the technical field of waterproof work and discloses a plane roof self-energy maintenance-free waterproof system and a construction method thereof. The waterproof system comprises a reinforced concrete base layer, wherein the base layer is sequentially provided with a first coating layer, a second coiled material layer, a concrete slope finding layer, a heat insulation layer, a cement mortar leveling layer, a second coating layer, a second coiled material layer and a fine aggregate concrete protection layer. The construction method comprises the following steps of baselayer treatment, brushing with a coating, node strengthening, laying of a first layer of coiled material, laying of the concrete slope finding layer, laying of the heat insulation layer, laying of the cement mortar leveling layer, laying of a second protector and laying of the fine aggregate concrete protection layer. By utilizing the construction method, all layers of structures, including two coating layers and the coiled material layers, of the waterproof system are completed. Due to the fact that the system includes the two coating layers and the coiled material layers, two flexible waterproof layers are formed, a dual-protection effect is played, the waterproof capability of the waterproof system is improved, and the service life of the waterproof system is prolonged.

The invention discloses a high-safety elevator for building external wall construction. The high-safety elevator comprises a base, a telescopic pull rod, a control panel, a storage battery, hydraulic oil tanks, positioning mechanisms, hydraulic cylinders, gravity sensors, a load plate, an illuminating lamp, a supporting plate, a steel wire rope and a feeding box; rolling wheels are fixedly connected to the lower portion of the base; the telescopic pull rod is rotationally connected with the base through a rotary shaft; the control panel is arranged on the outer side of an elevator body; the storage battery is arranged in the elevator body; the hydraulic oil tanks are arranged on the two sides of the storage battery; the positioning mechanisms are arranged on the two sides of the upper portion of the elevator body; and the hydraulic cylinders are arranged on the upper portion of the elevator body. The high-safety elevator for building external wall construction is provided with an anti-falling protective net and a damping mechanism, the anti-falling protective net effectively prevents personnel falling accidents in the using process, the damping mechanism can reduce vibration generated during ascending and descending to a certain extent, and the accidents such as falling and falling caused by shaking of workers are avoided.

The invention provides a device for guaranteeing normal operation of a sacrificial anode, wherein a steel framework is arranged outside an anode steel core and the body of the sacrificial anode; an inside mesh enclosure and an outside mesh enclosure are arranged on the steel framework; a high molecular porous sleeve is arranged between the inside mesh enclosure and the outside mesh enclosure; a blowdown apparatus is mounted under the inside mesh enclosure and the outside mesh enclosure. The device has the advantages that an anode in sea mud is provided with excellent working environment, the problems of current efficiency drop and passivation or reversing of the sacrificial anode in the sea mud are solved, the sacrificial anode is inhibited from being directly covered with sea water / matters or wastes, the use effect and the service life of the sacrificial anode are guaranteed and the replacement and maintenance costs of the anode are reduced. Besides, the device is simple to manufacture, convenient and quick to mount, low in cost, high in applicability and wide in application range; the device can be applied to a back-silting port, a submarine pipeline, an offshore drilling platform and the like.

The invention provides a Si / SiO2 / C composite nanofiber material, a preparation method thereof and an anode material, and relates to the field of battery materials. The Si / SiO2 / C composite nanofiber material is prepared from carbon nanofibers and Si / SiO2 particles, wherein the Si / SiO2 particles are located in the carbon nanofibers and are of a core-shell structure formed by coating Si particles with SiO2. With the adoption of the composite nanofiber material, the technical problem that cyclic stability of a battery is affected by the fact that a carbon coating layer is prone to separation fromsilicon and breakage in the conventional carbon coated silicon core-shell structured composite material can be solved, and structural stability of the silicon-carbon composite material is improved.

The invention relates to a gel electrolyte film for a secondary battery as well as preparation and application of the gel electrolyte film, and belongs to the technical field of gel polymer electrolytes. The gel electrolyte film disclosed by the invention is a film formed by connecting polyvinylidene fluoride-hexafluoropropylene, polyethylene glycol and MXene through hydrogen bonds; the gel electrolyte film has a function of inhibiting dendritic crystal growth of a metal negative electrode and good thermal stability, has high conductivity and a relatively wide electrochemical window after adsorbing an electrolyte of a secondary battery, and has good cycling stability and rate capability when being applied to the secondary battery as a gel electrolyte; in addition, the gel electrolyte filmis prepared by adopting a solution casting method, and is simple to operate, mild in condition and easy to popularize.

The invention relates to an antitheft window convenient for fire hazard life escape. A water collecting temperature reducing device is arranged on the top; a transverse cover plate is arranged at the middle part of the antitheft window; the antitheft window is divided into a drying part and a life escape part; the life escape part positioned at the lower part of the cover plate is provided with an outwards formed life escape door; the water collecting temperature reducing device comprises a water tank and a spraying pipe; the spraying pipe is communicated with the water tank; the spraying pipe can be manually or automatically opened; and a water collecting life escape bottle is arranged on one upright post of an outer frame, and is connected with the water tank. The water collecting box and the spraying pipe are arranged on the top of the antitheft window; rain is collected and is used for realizing the temperature reduction and fire extinguishment on regions near the window through the spraying pipe when the fire hazard occurs; the spraying pipe has two opening modes including valve manual control and tin soldering hot melting, so that the duplex guarantee is achieved; the life escape part used for evasion in the fire hazard is divided from the antitheft window by the cover plate; the life escape part is lower than a window aperture; smoke gas can be effectively avoided, so that people can wait for the rescue; the water collecting life escape bottle collects the rain, so that towels and the like can conveniently get wet, and people can cover the mouth and the nose to prevent the smoke gas poisoning.

The invention discloses a display panel and a display device. The display panel comprises a thin film packaging screen body, a cover plate and a packaging adhesive packaging layer. The thin film packaging screen body comprises a substrate and a thin film packaging layer. The substrate and the thin film packaging layer form a closed space. A light emitting layer is arranged in the closed space. Thethin film packaging screen body is provided with a display area and a non-display area located on the outer peripheral side of the display area. The cover plate is located on the side of the thin film package layer away from the substrate. The packaging adhesive packaging layer adheres the cover plate and the substrate in the non-display area. According to the display panel, the light emitting layer of the display panel is arranged in the closed space formed by the substrate and the thin film packaging layer, and the substrate and the cover plate are adhered and packaged by the packaging adhesive packaging layer arranged in the non-display area of the thin film packaging screen body so that double-layer packaging of the light emitting layer can be realized, doubly protection of the lightemitting layer can be realized and the packaging reliability can be enhanced.

The invention belongs to the technical field of rice transplanters, and particularly relates to a multifunctional valve used for controlling a seedling table of a rice transplanter to rise and fall. The multifunctional valve used for controlling the seedling table of the rice transplanter to rise and fall comprises a reversing valve, a shuttle valve, a hydraulic-control one-way valve, a stop valve, a one-way throttling valve and a lifting oil cylinder, wherein the reversing valve, the shuttle valve, the hydraulic-control one-way valve, the stop valve, the one-way throttling valve and the lifting oil cylinder are connected in sequence. The reversing valve is a five-position and four-way reversing valve. A first oil outlet of the reversing valve communicates with a first oil port of the shuttle valve and a main oil path of the hydraulic-control one-way valve. A second oil outlet of the reversing valve communicates with a second oil port of the shuttle valve and an auxiliary oil port of the hydraulic-control one-way valve. An unloading valve is connected to an oil outlet of the shuttle valve. A throttling pressure-relief hole communicating with the auxiliary oil port of the hydraulic-control one-way valve is formed in the hydraulic-control one-way valve and is connected with an oil tank. The reversing valve has a rising position, a throttling rising position, a middle position, athrottling falling position and a falling position. An oil outlet of the one-way throttling valve communicates with a cavity of the lifting oil cylinder, and the other cavity of the lifting oil cylinder communicates with the oil tank. The reversing motion of the reversing valve controls the lifting oil cylinder to rise and fall.

The invention relates to a main-sub pot-type combined container for liquid nitrogen. The container comprises sub pots, a pipeline system, an interlayer, a main pot, a measurement and control system, safety accessories and an external operation platform; the combined container for the liquid nitrogen is coated with paint and mounted on a basic platform; five sub pots are distributed concentrically to form an equilateral polygon; the pipeline system is arranged in a center area from five sub pots to the main pot; each sub pot adopts the structure of a vertical cylinder; the bottoms of the sub pots are supported by support legs; a filling opening, an air outlet, an external pressurization opening and an upper shifting filling opening are formed in each pot. The combined container can be used for implementing the processes of shifting filling, pressurization, pressure release, and real-time monitoring and control, and is ideal large-sized liquid nitrogen storage and supply equipment. The container is used for storage and supply of the liquid nitrogen, liquid is discharged out through a pressure extrusion method, the operation is simple, the reliability is high, discharge loss during the storage period is reduced through storage under pressure, compared with a spherical tank, the main-sub pot-type combined container is easier to manufacture and mount, and the manufacturing and mounting costs are low, therefore, the container has relatively high security, stability and controllability.

The invention relates to the technical field of valves, in particular to an automatic multi-station valve drilling and tapping compound machine. Each machine frame is provided with a main shaft, one side of each main shaft is provided with a stroke air cylinder which runs up and down, and the lower end of each main shaft is connected with a clamping head used for installing a drill bit, a hole expanding drill, a chamfering head and a screw tap; and hydraulic chucks used for containing valve bodies are arranged at the positions, below the main shafts, of the upper end of a mounting table, a rotatable digital display screen is arranged on the side wall of a peripheral shell through a support, each hydraulic chuck is provided with an independent pedal switch to control the operation of the corresponding hydraulic chuck, and a PLC electric control mounting plate assembly controls the machine to operate through a signal receiving module. According to the automatic multi-station valve drilling and tapping compound machine, a plurality of procedures are completed on one piece of machine equipment, so that the automation degree is high, the safety performance is high, the labor intensity is reduced, the production efficiency is improved, and the outstanding substantive features and the remarkable effects are achieved.

The invention relates to an external oil cooling device for a novel water-cooled type low-temperature refrigerant compressor unit. The external oil cooling device comprises a compressor (1), an oil cooler (2), an oil pump (3) and a hand valve A (7). The compressor (1) comprises a standby oil inlet (1-1) and a standby oil outlet (1-2), wherein the standby oil outlet (1-2) is sequentially connected with the oil cooler (2), the hand valve A (7), the oil pump (3) and the standby oil inlet (1-1), and a bypass valve (6) is connected between the standby oil outlet (1-2) and the hand valve A (7) in parallel. An oil filter (10) is connected between the oil pump (3) and the hand valve A (7). A flow switch (12) is connected between the oil pump (3) and the standby oil inlet (1-1). A differential pressure switch (13) for detecting differential pressure of an inlet and an outlet of the oil filter (10) is further provided. The external oil cooling device for the novel water-cooled type low-temperature refrigerant compressor unit has the advantages of cooling lubricating oil, removing impurities in the lubricating oil and prolonging the service life.

The invention firstly provides a welding automatic clamp used for stirring friction welding. The welding automatic clamp comprises a bottom plate, a controller, a hydraulic mechanism, a detection device and a support used for placing a to-be-welded workpiece; assembly holes is formed in the support and are used for fixing the support on the bottom plate through screws; the hydraulic mechanism andthe detection device are both connected with the controller; and secondly, the invention provides a control method of the welding automatic clamp used for stirring friction welding. The welding automatic clamp used for stirring friction welding has the advantages that the to-be-welded workpiece is limited by adopting the hydraulic mechanism; the automation degree is high; and labor cost is greatlylowered.

A protection device against voltage surges, connected between an electric line and earth, comprises a first connecting electrode, a second connecting electrode and a mobile switching electrode for switching between an operating position, in contact with the first connecting electrode, and a switching position, close to the second connecting electrode. An electric dipole, comprising for example a variable resistor and / or a spark arrester, connects the mobile electrode to the second connecting electrode. The mobile electrode can be moved by a mechanism, an electromechanical relay and / or a magnetic circuit performing repulsion when the current intensity becomes very high. Separation of the electrodes produces an arc which limits the current flowing in the dipole then, by switching on the second connecting electrode, performs disconnection of the dipole from the circuit thus ensuring protection thereof.

The invention discloses a heating device for medium oil in a working cylinder of a heating isostatic-pressing machine. The heating device comprises the working cylinder, a temperature sensor is arranged on the inner wall of the working cylinder, a heating unit is arranged beside the working cylinder, the heating unit comprises a heating coil, an oil outlet pipeline, an oil inlet pipeline and a die heater, the heating coil is arranged at the bottom of the working cylinder, the heating coil is communicated with the die heater through the oil outlet pipeline and the oil inlet pipeline, and the temperature sensor is electrically connected with the die heater. The heating device has the beneficial effects that the even temperature of the medium oil in the working cylinder is ensured, and the medium oil is subjected to temperature compensation.

A light emit diode is characterized in that the light emit diode comprises a light emitting epitaxial structure; a metal electrode formed on the light emitting epitaxial structure and electrically connected to the light emitting epitaxial structure; at least a portion of the surface of the metal electrode is covered by a low-potential metal layer, and the potential of the metal used in the low-potential metal layer is lower than the potential of the metal on the surface side of the metal electrode. The low-potential metal layer can effectively solve the technical problem that the surface and the exposed part of the LED core metal electrode are easy to be corroded in the prior art.

The present invention provides a drainage trapping device which can prevent waste gas or poisonous gas containing bacteria from flowing backwards. The drainage trapping device comprises a water inlet pipe, a drainage trapping cartridge, a water outlet pipe, a float valve and a retaining component. The drainage trapping cartridge is provided with a water outlet which is connected to the water outlet pipe. A lower end of the drainage trapping cartridge is connected with the water inlet pipe. The float valve is disposed inside the drainage trapping cartridge and hermetically engages with a lower part of the drainage trapping cartridge when the drainage trapping cartridge is devoid of water. The retaining component is disposed at the water outlet of the drainage trapping cartridge or in the water outlet pipe, for preventing the float valve from running out.

The invention discloses a balloon puncture outfit capable of effectively preventing air leakage, which comprises a sleeve base, a first connecting pipe, a puncture rod, an elastic channel, fasteners, a puncture sleeve, a check ring and a puncture head, wherein a puncture rod insertion hole is formed in the sleeve base, an anti-skid pad is arranged on the outer side of the sleeve base, the first connecting pipe is arranged above the sleeve base, a valve is arranged on the first connecting pipe, a second connecting pipe is arranged on the right side of the first connecting pipe, the puncture rod penetrates through a sealing ring in the sleeve base through the puncture rod insertion hole, the two sides of the sealing ring are fixedly connected with the sleeve base through springs, the elastic channel is arranged in the sleeve base, a sealing film is arranged on one side of the elastic channel, the fasteners are arranged on the two sides of the sealing film, and clamping hooks are arranged on the two sides of the sealing film. According to the balloon puncture outfit capable of effectively preventing air leakage, an air leakage preventing sealing film and an air leakage preventing plug are arranged, the air leakage preventing sealing film is arranged in the annular balloon, the dual protection effect is achieved, and the air leakage preventing plug effectively prevents air leakage accidents of the annular balloon.

The invention discloses a deep scarification combined land preparation machine and an operation method. The deep scarification combined land preparation machine comprises a traction frame, a tooth frame beam, a deep scarification tooth assembly, a harrow group and a pressing roller, wherein the traction frame is connected with the tooth frame beam, the deep scarification tooth assembly is hung at the lower end of the tooth frame beam, the harrow group comprises a harrow group cross beam and harrow pieces, the pressing roller comprises a pressing roller cross beam and a pressing roller body hung at the lower end of the pressing roller cross beam, the harrow group is located at the front end of the pressing roller body, and the harrow group cross beam and the pressing roller cross beam are connected with the tooth frame beam through the same depth-limiting leveling mechanism. The operation depth of the deep scarification tooth assembly and the operation depth of the harrow group can be synchronously adjusted, and on the basis that the operation depth of the deep scarification tooth assembly and the operation depth of the harrow group are synchronously adjusted, the operation depth of the harrow group can be further independently adjusted.

The invention discloses a processing method for a manmade shaving board. A fire retardant consists of magnesium hydroxide, aluminum hydroxide, superfine zinc borate, nano Mg / Al-LDH, talcum powder andan improver, is an inorganic fire retardant, does not contain formaldehyde, is non-toxic and free of peculiar smell, is simple in composition, and is green and environmentally friendly; during manmadeboard manufacturing, a using method of the fire retardant is also different according to characteristics of the board, so that the flame-retarding effect of the fire retardant and compatibility of anadhesive are brought into play to the greatest extent, i.e., the shaving board is formed by cutting a wooden section into a veneer in a rotary mode or slicing a batten into thin wood, and shaving with the adhesive; and the shaving board is soaked into the fire retardant, and the fire retardant can be effectively adhered on the surface of the shaving board, so that use amount of the flame retardant further can be reduced while fire resistance of the shaving board is improved, and the production cost is reduced.

The invention discloses a liquid level controller which comprises a floating ball switch, and is characterized in that a shell sleeves the floating ball switch in such a manner that an interlayer is formed between the shell and the outer wall of the floating ball switch; a balancing weight is fixed in the upper half part of the interlayer. The liquid level controller has the benefits that a sealing block made of a foaming agent is arranged in the shell, so as to avoid the potential hazard that the floating ball sinks when the plastic shell breaks and water enters the broken shell; the balancing weight can provide a certain weight to make the liquid level controller more stable in a liquid, so as to reduce the length of a binding thread, and ensure that the liquid level controller is particularly suitable for circumstances such as a shaft and a relative small tank body; the shell is sealed, so as to provide sufficient buoyancy force to ensure normal use, and prevent the liquid from entering the shell to erode and damage related electric elements in the shell.

A ladder hinge with dual lock pins includes an outer hinge member, an inner hinge member, a pivot, and a locking device; the outer hinge member provides two opposite lock-holes; the inner hinge member provides three pairs of locating holes; the pivot joins the outer and inner hinge members; the locking device consists of a push knob, a compression spring, and a lock-pin assembly; the lock-pin assembly further has a handle, a linking shaft, and two lock-pins; the lock-pins each have a holding groove disposed near the free ends thereof to achieve the unlock state; the free ends of the lock-pins each are provided with an inclined arc surface at the back of the holding grooves for keeping the ladder hinge at unlocked state during the ladder hinge being closed.

The invention discloses high-heat-dissipation electromagnetic shielding equipment and a heat dissipation method. The equipment comprises a fixed bottom plate, an electromagnetic shielding chamber, a negative pressure chamber, a square air outlet pipe, a cooling plate, an air feeding pipe and a water collecting box, the fixed bottom plate is installed on the bottom wall in the electromagnetic shielding chamber, and the negative pressure chamber is installed on the back face of the electromagnetic shielding chamber; a cooling plate is installed in the negative pressure chamber, a square air outlet pipe is connected to the surface of one side of the electromagnetic shielding chamber, an air supply pipe is connected to the surface of the other side of the electromagnetic shielding chamber, an air compressor is installed on the bottom wall in the negative pressure chamber, and a water collecting box is installed at the bottom of the negative pressure chamber. And a storage cabinet is mounted in the electromagnetic shielding chamber. By arranging the fixed bottom plate, through the telescopic movement of electric telescopic rods on the surfaces of the two sides, air flow in the electromagnetic shielding chamber can be driven to conduct compression movement, so that hot air at corners in the electromagnetic shielding chamber is stirred, the omnibearing extraction of the negative-pressure fan is facilitated, and efficient and comprehensive heat dissipation and refrigeration are achieved.