28results about How to "Achieving a dynamic seal" patented technology

The invention provides an injection mold convenient to demold, and belongs to the technical field of injection molds, the injection mold convenient to demold comprises a fixed mold base, a movable mold base and a mounting plate mounted at the bottom of the fixed mold base, and further comprises a gradient cooling assembly and a magnetic sealing assembly; according to the mold, the gradient cooling assembly and the magnetic sealing assembly are integrated, a stepped cooling environment is created at the fixed mold core and the movable mold core, the cooling requirements of different parts of an injection molding part are met, and the quality of the injection molding part is improved; when the mold is not closed, the liquid guide pipe is tightly sealed by the ball plug, so that external dust or water vapor is effectively prevented from entering the mold, and meanwhile, a stepped cooling environment is favorably created; the magnetic sealing assembly can achieve dynamic sealing between the liquid guide pipe and the liquid guide opening in the mold closing and separating process of the mold, and when the mold is closed, cooling liquid is prevented from flowing through a gap; and when the mold is separated, the air bag is gradually deflated and is recovered to an unsaturated state, so that the liquid guide pipe can be conveniently drawn out, the friction force is reduced, and the wear degree of the air bag is reduced.

The invention discloses a dynamically sealed rotary constant-pressure filling device which comprises a constant-pressure tank, a first friction seat is detachably connected to the bottom of the constant-pressure tank, a filling mechanism capable of rotating is arranged below the first friction seat, and a second friction seat extending into the first friction seat is arranged on the filling mechanism. The first friction seat and the second friction seat are respectively provided with a first conical surface and a second conical surface, the second conical surface is in linear contact with the first conical surface, the distance between the first conical surface and the second conical surface is gradually increased downwards from the connecting position, a plurality of positioning rods are arranged on the constant-pressure tank in a sliding manner, and a spring is arranged on the constant-pressure tank; the spring is used for applying downward pressure to the first conical surface, a liquid outlet of the constant-pressure tank is communicated with the second friction seat through the first friction seat, and the hardness of the first friction seat is smaller than that of the second friction seat. Compared with the prior art, the problem that a liquid storage tank of an existing filling machine cannot conduct constant-pressure filling is solved, the productivity and the filling quantity precision of the rotary filling machine are improved, and no residual tail liquid is left.

The invention relates to the technical field of settlement post-cast strips, in particular to a pre-closed advanced water stop grouting device and method.The pre-closed advanced water stop grouting device comprises a basement top plate, a bottom plate, a cover plate and a grouting sleeve and further comprises a self-adaptive adjusting assembly; the self-adaptive adjusting assembly comprises an inner cylinder, an outer cylinder, a spring, a sealing ring and a pre-tightening force adjusting component, and when the building body settles, the cover plate descends to drive the outer cylinder to descend, and then the spring is extruded; the springs on the two sides generate reverse buffering force after being compressed, the force is transmitted to the cover plate through the outer cylinder, the internal stress of the cover plate caused by differential settlement is effectively counteracted, and it is avoided that a sealing structure at the joint of the cover plate and a basement top plate cracks due to rigid pulling; and after the settlement is stable, pressure grouting is performed through the grouting sleeve, so that the problems of cracking of the cover plate and failure of sealing structures such as a sealant and a waterproof coiled material due to rigid pulling are solved.

The invention discloses a coal-bed gas well tubing gas recovery wellhead sealing device and a using method thereof.The coal-bed gas well tubing gas recovery wellhead sealing device comprises a vertical shaft, a sealing device and a sealing device, the oil pipe is vertically arranged above the shaft, and an end cover is fixed to the end of the shaft through a bolt; the mounting seat is fixed at the upper end of the end cover, and the oil pipe is connected in the mounting seat in a penetrating manner; the sealing ring is arranged in the mounting seat and sleeves the oil pipe; the dynamic packing unit is coaxially arranged above the mounting seat and located outside the oil pipe, an elastic rubber ring is arranged in the dynamic packing unit, and the dynamic packing unit is in sealing contact with the oil pipe through the elastic rubber ring; the air guide seat is installed on the upper portion of the interior of the shaft, and the air guide seat is externally connected with a first air seal cylinder; the rectification seat is mounted in the shaft and located below the gas guide seat, and the rectification seat is used for rectifying coal bed gas conveyed in the shaft; and the rectification seat is externally connected with a second air seal cylinder.

The utility model discloses a kind of heat-insulated fireproof doors, comprising: door frame and two groups of fireproof door panels, two groups of fireproof door panels are fixedly installed with heat insulation layer between, heat insulation layer one end is provided with installation port, installation port is fixedly installed with door gap plugging mechanism, and the plugging end of door gap plugging mechanism extends from the gap between two groups of fireproof door panels, and two groups of fireproof door panels are rotatably installed in door frame, and then make door gap plugging mechanism can extend from between fireproof door panel and touch on the inner wall surface of door frame.The application is designed by door gap plugging mechanism, so that it passes through the double protection mechanism of " primary sealing + automatic plugging", first by fireproof door panel and spacer plate form preliminary blocking, then utilize zirconium fibre composite felt to automatically expand and fill gap when fire, substantially delay the speed of high-temperature dense smoke diffusion to indoor, and gain more escape time for personnel.

The utility model provides a kind of roasting furnace energy-saving smoke exhaust device, it is related to roasting furnace technical field, including flue gas pipeline main body, flue gas pipeline split body and support structure, the flue gas pipeline main body left and right sides are equipped with support structure, the flue gas pipeline split body is equipped in flue gas pipeline main body below, the flue gas pipeline main body is fixedly connected with flue gas pipeline split body and inside intercommunication, the utility model replaces traditional slope flue structure using direct connection type metal smoke exhaust device, constructs the efficient path of roasting furnace fire well mouth direct annular total flue. Especially designed reducing pipe perfect cover furnace mouth, effectively eliminates the local resistance at interface, cancels the slope flue and intercommunication cover, reduces flue gas flow resistance, the utility model is installed using hoisting mode, and recycling is carried out around the use of roasting furnace, by improving the pass rate of flue gas, effectively utilize flue gas waste heat to preheat graphite, save energy, achieve energy-saving production.

The utility model discloses a kind of electrolytic cell pipeline impurity real-time detection systems based on endoscope, including controlled in pipeline movement endoscope module, pattern transmission processing system, system linkage module;Endoscope module includes integrated optical module, mechanical drive module, it moves in pipeline and visualizes collection to impurity in pipeline;Pattern transmission processing system includes control cable, control processing system, control cable includes signal cable, optical fiber image transmission bundle, control cable one end is connected with endoscope module, control processing system is based on algorithm real-time analysis impurity characteristic to the image transmission of integrated optical module;System linkage module triggers hierarchical early warning based on impurity detection result. With hays alloy C276 shell, sapphire protective lens and gradient composite coating, combined with cooling runner design, so that system can be stable operation under high temperature, high pressure, strong corrosion environment, probe continuous working life ≥ 80,000 hours, more than 5 times than traditional endoscope.

The present invention discloses a curtain wall type side sealing device for a sintering machine trolley, comprising a sealing wall, a sealing plate and a bottom seal, wherein the sealing wall is located on both sides of the trolley, and the sealing walls are connected by a connecting wall, and a plate that fits the side wall of the trolley is elastically connected to the inner wall of the sealing wall, and the plates are butted against each other to form a curtain wall structure, and a clearance groove is provided on the plate, and a connecting plate connected to the plate is elastically connected to the inner wall of the connecting wall, and the connecting plate seals the curtain walls, and sealing rods are provided on both sides of the bottom of the trolley, and the sealing rods are slidably matched with the bottom seal of the trolley. The curtain wall structure is adopted to reduce the air leakage at the connection of the trolley, and the plate is sealed by elastic contact through a spring, which can not only reduce the serious wear caused by excessive contact force, but also avoid the problem of poor sealing effect caused by wear, and solve the problem of reduced sealing effect caused by wear, so that heat can better sinter the ore and improve the sintering quality.

The utility model relates to an intelligent pneumatic three-position valve assembly which comprises a valve body, air inlet holes are symmetrically formed in the left end and the right end of the valve body, air outlet holes are evenly distributed in the front end of the valve body, micro valves are evenly distributed at the upper end of the valve body, and the rear ends of the air outlet holes are connected with air outlet pipes. The end, away from the air outlet hole, of the air outlet pipe is connected with a first airflow pipe, a sealing terminal is arranged in the air inlet hole, a dynamic sealing structure is arranged in the middle of the inner surface of the sealing terminal, a sealing groove is formed in the end, close to the valve body, of the sealing terminal, and a sealing ring is arranged in the sealing groove. By arranging the dynamic sealing structure, the air pressure formed by airflow is utilized to control whether the sealing rubber sheet and the annular plate are in contact to form a whole or not, dynamic sealing is achieved, and using blocking is not needed. The micro valves are arranged to respectively control the flow and on-off of the air outlet holes, so that the air displacement of the air outlet holes is consistent, and the power consumption is reduced.

The invention belongs to the technical field of drilling tools for ultra-deep wells, and discloses an ultra-temperature-resistant screw drill stator which comprises a stator bushing and a stator shell, and the stator bushing is arranged in the stator shell and is a heat-conducting elastomer. According to the invention, the stator bushing adopts the super-heat-conducting elastomer, all the advantages of the original elastomer are maintained, the stator bushing also has excellent heat conductivity of metal, and the heat-conducting elastomer can really realize dynamic sealing under a super-high-temperature medium in a myriameter deep well. Under the actual use working condition of an oil field, the stator bush adopts the super-heat-conducting elastomer, heat can be quickly transferred into drilling fluid, the heat is brought to the ground surface through drilling fluid circulation, the drilling fluid serves as a cooling agent, the temperature of the stator bush is stabilized within a receivable range, the aging speed of the elastomer is slowed down, and the service life of the elastomer is prolonged.

The utility model relates to a falling rod sealing device belongs to the technical field of industrial equipment sealing. Including falling rod frame and installing elastic support mechanism on the falling rod, and the falling rod is hung in the downside of falling rod frame through chain, elastic support mechanism includes locating block, stud, adjusting nut and spring, locating block fixed mounting is in the falling rod frame, the stud is set in the locating block through the coupling, and the adjusting nut of locating block below is sleeved on the stud, and the spring is set between adjusting nut and falling rod, and the falling rod is closely contacted with the trolley sealing plate through the elastic force provided by spring. The utility model adds the elastic support mechanism on the basis of existing falling rod, so that in addition to falling rod can rely on the self weight and trolley top surface contact, still can rely on the elastic force that elastic support mechanism adds and trolley top surface contact, ensure that the sealing is good, avoid the air leakage.

The utility model discloses a mould electric heating device for a hot runner in the mould field, the device comprises a bimetallic strip and an electric heating wire, the bimetallic strip is formed by compounding two metal layers with different thermal expansion coefficients, the bimetallic strip is bent into an open ring shape to form a heating sealing sleeve, and the heating sealing sleeve is connected with the bimetallic strip. The heating sealing sleeve is sealed and fixed through deformation generated when the bimetallic strip is heated and bent. The electric heating wire is in contact with the bimetallic strip so as to provide heat for the bimetallic strip; and the electric heating wire is arranged in the bimetallic strip and is in contact with the bimetallic strip. Dynamic sealing is achieved through heating deformation of the bimetallic strip, screw connection is omitted, meanwhile, the heating sealing sleeve deforms in a self-adaptive mode along with the temperature, the heating sealing sleeve can be tightly attached to the surface of a mold, and the sealing reliability is remarkably improved.

The invention relates to the technical field of tensile detection, in particular to a tensile detection device based on high-wear-resistance Gaussian crack fabric processing, which comprises a processing table, a detection mechanism is arranged on the processing table and is used for tensile detection of a high-wear-resistance Gaussian crack fabric sample, and the detection mechanism comprises a main body assembly, comprising a front sliding base installed on the front side of the upper end of a machining table in a front-back sliding mode, a front installation base is fixed to the upper end of the front sliding base, a rear sliding base is installed on the rear side of the upper end of the machining table in a front-back sliding mode, and a rear installation base is installed at the upper end of the rear sliding base in a front-back sliding mode; a pressure sensor is mounted between the output end of the first cylinder and the rear end of the rear mounting seat; through the synergistic effect of mechanical pressing and vacuum adsorption, uniform pressure distribution is guaranteed while firm clamping is achieved, and the surface of the material is prevented from being damaged; in addition, dynamic sealing is matched to maintain stable adsorption, so that the reliability and the accuracy of a test result are improved.

The utility model provides a two-dimensional flow direction labyrinth type multi-stage depressurization regulating valve which is characterized in that a sleeve seat is arranged at a throttling hole of an inner cavity of a valve body, a two-dimensional flow direction labyrinth sleeve assembly is arranged on the sleeve seat, a sealing ring seat is arranged on the two-dimensional flow direction labyrinth sleeve assembly, the sealing ring seat is tightly pressed in the valve body through an upper cover, a valve core is arranged in the valve body, and the two-dimensional flow direction labyrinth type multi-stage depressurization regulating valve is arranged in the valve body. A valve rod is arranged on the valve element, the upper end of the valve rod sequentially penetrates through a guide sleeve and an upper cover to extend out of the upper cover, the guide sleeve is installed in an inner hole in the bottom end of the upper cover, and a sealing filler set is arranged in an inner hole in the upper end of the upper cover. And a filler pressing plate is arranged above the sealing filler group and is connected with the upper cover. The two-dimensional flow direction maze sleeve assembly is of a multi-layer flat plate maze type structure, the maze set can be detached to be cleaned and replaced independently, the maintenance cost of customers is reduced, machining is easy, and cost is low; through radial and axial combination of the two layers of labyrinth pieces, a plurality of 90-degree bent flow channel structures are formed, and pressure reduction or noise reduction is achieved.

The invention discloses a cable conveying hydraulic driving system for a high-water-level and high-fall environment, which comprises a hydraulic power unit, a conveying execution mechanism, a sealing waterproof mechanism and an intelligent control system, and adopts a roller conveying part to convey a cable; the roller conveying part comprises a driving roller and a driven roller. Through system-level collaborative innovation, the low-speed and large-torque hydraulic motor is used for driving the conveying execution mechanism, cable conveying operation is achieved, dynamic sealing of the output shaft of the hydraulic motor and the waterproof shell is achieved, the multiple mechanical sealing structure is reliable, and the problem that under the complex working condition that the high water level, the large fall and the narrow space coexist, the mechanical sealing performance is poor is solved. According to the technical scheme, the technical contradiction that the prior art is difficult to consider among equipment waterproof reliability, traction dynamic property, structural compactness and operation stability is overcome, IP68-level waterproof, stable torque output not lower than 800 N.m, light weight within 100 kg and intelligent self-adaptive operation are achieved, and the construction efficiency and safety of cable laying in the complex environment are remarkably improved.

The utility model belongs to sealing structure technical field especially is a kind of reinforced sealing structure of ash valve, including upper connecting pipe, connecting flange and ash valve body, the upper connecting pipe with ash valve body between, ash valve body and lower connecting pipe between are all connected by connecting flange;The end face of connecting flange is equipped with flange milling groove, and elastic rubber ring is embedded in the flange milling groove, fastening bolt is arranged in the both sides of connecting flange, and the outside of fastening bolt is engaged with the installation of limit stopper;Through groove body accurate limit, add temperature-resistant rubber ring, the sealing life is greatly improved, fluorine rubber hollow rubber ring is pre-compressed, and rubber ring energy storage rebound compensation is realized dynamic sealing, pressure rises rubber ring release energy storage and fill the gap, pressure drops rubber ring automatic reset, through two-stage anti-loosening mechanism, limit stopper mechanical interlock, positioning screw fine adjustment, and the bolt torque attenuation rate is greatly reduced compared with traditional scheme.

The utility model discloses a dynamic sealing structure for vacuum environment, including sealed support subassembly, sealed support subassembly sets up in the through -hole inside the first plug -in chamber and is opened, and first plug -in rod is through sealed support subassembly, and the outer wall is with sealed support subassembly inside slide connection, realizes to the dynamic sealing of plugging. Sealed support subassembly includes first sealed support, and first sealed support is the trumpet mouth pipe body, and the trumpet mouth pipe body outer wall upper end sets up the upper notch, and the middle part sets up the middle notch, and the lower end sets up the lower notch. Sealed support subassembly still includes first sealed support upper sealing washer, first sealed support middle sealing washer and first sealed support lower sealing washer, and first sealed support upper sealing washer is connected in the upper notch, and the utility model discloses a purpose in overcoming the defect of current and provides a dynamic sealing structure for vacuum environment, satisfies the requirement of linear motion dynamic sealing.

The present invention provides an injection mold that is easy to demold, belonging to the technical field of injection molds. The invention comprises a fixed mold base, a movable mold base and a mounting plate installed at the bottom of the fixed mold base, and also comprises: a gradient cooling component and a magnetic sealing component; the mold creates a stepped cooling environment at the fixed mold core and the movable mold core by integrating the gradient cooling component and the magnetic sealing component, thereby meeting the cooling requirements of different parts of the injection molded parts and improving the quality of the injection molded parts; when the mold is not closed, the ball plug tightly seals the liquid guide tube, effectively preventing the entry of dust or water vapor from the outside, and at the same time helping to create a stepped cooling environment; the magnetic sealing component can realize dynamic sealing between the liquid guide tube and the liquid guide port during the process of mold closing and separation, and when the mold is closed, it prevents the coolant from flowing through the gap; when the mold is separated, the airbag gradually deflates and returns to an unsaturated state, which is convenient for the withdrawal of the liquid guide tube, while reducing the friction and the wear of the airbag.

This utility model discloses a leak-proof device for the feed inlet of a shot blasting machine, comprising: a hook-type shot blasting machine, wherein a traveling hook is movably mounted on the hook-type shot blasting machine; a clearance groove, formed in the top of the hook-type shot blasting machine, wherein a guide groove plate is fixedly connected to the top of the clearance groove, and the inner side of the guide groove plate is hollow; a servo motor, installed on the top of the hook-type shot blasting machine, wherein a baffle turntable is fixedly connected to the motor shaft of the servo motor, and a mating groove is formed through the baffle turntable. This application, by setting the baffle turntable to cooperate with the guide groove plate, allows the baffle turntable to shield the top of the guide groove plate when the traveling hook passes through the mating groove, using the turntable's own structure to prevent steel shot from splashing from the clearance groove. The sealing structure of the baffle turntable is more compact, making it difficult for steel shot to penetrate, significantly improving the leak-proof effect and reducing steel shot waste; the mating groove always corresponds to the position of the hook, avoiding sealing gaps caused by hook movement, achieving dynamic sealing, and further preventing steel shot splashing.

The application relates to a valve pipe joint, which comprises a valve body formed with a vertical channel and a horizontal channel in communication with each other, the horizontal channel is located above the vertical channel, one side of the horizontal channel is formed with a liquid outlet, the liquid outlet is formed with liquid outlet threads, the vertical channel is formed with liquid inlet threads in a liquid inlet; a check member is arranged in a small-diameter section of the vertical channel, the check member comprises a spring assembly and a valve core, the spring assembly is connected to the valve body, the valve core is fixed to the upper end of the spring assembly, and the valve core is used for moving along the vertical direction to open or close the vertical channel through the spring assembly. The vertical channel and the horizontal channel are designed in a right-angle structure, space utilization is high, a compact environment is adapted, the valve core is elastically connected in the vertical channel, a liquid flow path from bottom to top is adapted, dynamic sealing of the valve core is realized, the structure is simple, manual operation is not needed, and cost is saved.

The utility model relates to domestic appliance technical field discloses cooking equipment, include: cooking cavity, is equipped with exhaust hole on it, exhaust structure, including exhaust hood and exhaust valve piece, exhaust hood has the exhaust passage of communication exhaust hole and outside space in, exhaust hood is detachably connected on cooking cavity, and exhaust valve piece is pressed at exhaust hole, exhaust valve piece includes elastic deformation part, elastic deformation part can change shape under the action of pressure in cooking cavity, and can automatically adjust the amount of opening and closing along with pressure change. The elastic deformation part of exhaust valve piece in the application can change shape under the action of pressure in cooking cavity, and can automatically adjust the opening size of exhaust hole along with pressure change, so as to realize the automatic regulation of exhaust volume, ensure the steam temperature and pressure in cooking cavity under the steam mode, simple and reliable structure can also shorten the cooking time, improve food cooking effect.

The invention provides a sealing mechanism, a robot arm device and an unpacking system. The sealing mechanism is used for achieving sealing between the mechanical arm and an open window of the bin gate, and the mechanical arm can be arranged at the open window in a penetrating mode. The sealing mechanism comprises a sealing piece, the sealing piece is arranged on a preset part of the mechanical arm in a sealing and sleeving mode, the preset part is at least part of a mechanical arm body, right opposite to the window, of the mechanical arm when the mechanical arm is arranged at the window in a penetrating mode, and the sealing piece is used for generating elastic deformation when the mechanical arm is arranged at the window in a penetrating mode. Further, the inner peripheral wall of the open window is extruded and contacted. According to the sealing mechanism, dynamic sealing between the mechanical arm and the opening window of the bin door can be achieved, external dust can be prevented from entering the bin door, and materials in the bin door can be prevented from escaping outwards.

The utility model discloses a mobile dangerous chemical processing apparatus, including protection mechanism, it includes mobile device, the top fixedly connected with baffle of mobile device, the bottom fixedly connected with left fixed plate of baffle right side, the right side of left fixed plate inner chamber is provided with the protective outer box, the left side of protective outer box and the inner chamber contact of left fixed plate, the utility model discloses through bottom mobile device realizes flexible transfer, and wheeled trailer structure is convenient for vehicle traction, and protective outer box adopts vacuum protective layer and blast -proof housing double protection, and the inner layer is stainless steel, and the outer layer is blast -proof fiber braided layer, ensures the transportation safety, and pressure sensing unit real -time monitoring chemical container pressure, and data is transmitted to control unit, and cylinder is through slide and metal plate linkage, and according to pressure data drive connecting plate adjustment protective outer box position, realizes dynamic sealing, and has improved the security of chemical transportation.

The utility model relates to the technical field of electric ball valves, and particularly discloses a temperature control electric ball valve which comprises a valve body. The mounting sleeve is fixed on the valve body; the temperature sensor penetrates through the mounting sleeve; the sealing cover is located at the bottom of the mounting sleeve and makes contact with the end of the temperature sensor, a moving rod is connected to the top of the sealing cover, a moving groove is formed in the bottom of the mounting sleeve, and the moving rod is mounted in the moving groove; the elastic piece is arranged between the inner wall of the moving groove and the moving rod; through an automatic locking mechanism at the bottom, the elastic piece drives the sealing cover to seal the channel at the bottom of the mounting sleeve in a normal state, and when the temperature sensing probe is inserted, the probe extrudes the sealing cover to enable the elastic piece to deform, and the channel is opened; when the probe is pulled out, the elastic piece immediately drives the sealing cover to reset, spraying of media in the valve body can be automatically blocked, dynamic sealing of the mounting hole is achieved, and the probe can be detached without closing the valve in the running state.

The utility model relates to a conveying pipe connecting technical field especially relates to a kind of connecting structure of flexible composite high-pressure conveying pipe, including pipeline one and pipeline two, the end of pipeline one is equipped with flange interface one, the end of pipeline two is equipped with flange interface two, flange interface one and flange interface two mutually adhere to set, the inside of flange interface one and the inside of flange interface two are all penetrated and distributed with several bolts, the other end of bolt is equipped with nut with thread, the surface of flange interface two is tightly set on one side of nut. The scheme is formed double protection by the bolt fastening of flange interface and the wrapping type sealing of sealing sleeve, sealing sleeve adopts half splicing design, and embedded water-swelling rubber sealing ring, when pipeline conveys liquid, sealing ring water-swelling can automatically fill fine gap, realize dynamic sealing, and the tight cooperation of annular sealing groove and flange interface further prevents medium leakage.

The invention discloses a heat exchanger heat exchange system for hydrofining fuel oil, and relates to the technical field of heat exchangers, the heat exchanger heat exchange system comprises a pipe seat, a flow dividing seat and a flow guiding seat are respectively mounted at two ends of the pipe seat, support plates are symmetrically mounted in the pipe seat, a plurality of outer pipes are uniformly mounted on the side end surfaces of the support plates at equal intervals, and inner pipes are mounted in the outer pipes; according to the heat exchanger, the heat exchange work effectiveness can be guaranteed, meanwhile, the temperature and pressure difference between the inside and the outside of the inner pipe is reduced, the flowing force of reaction oil and raw oil serves as driving force, the unit heat release amount of the reaction oil and the unit heat absorption amount of the raw oil are dynamically adjusted and controlled, the heat exchange efficiency is improved, and the heat exchange efficiency is improved. The method improves the timeliness and effectiveness of oil temperature control, enhances the connection stability of the heat exchanger and the front and rear processes, relieves the front and rear thermal load pressure and compression energy consumption, is suitable for the hydrofining process of fuel oil with more quality specifications, and is more energy-saving and environment-friendly.

This utility model relates to the field of electricity meter technology and discloses a dustproof electricity meter, comprising: a housing, a wiring cavity on one side of the lower part of the housing, wiring mechanisms arranged at equal intervals inside the wiring cavity, and a cover plate rotatably installed outside the wiring cavity on the outside of the housing; bottom holes arranged at equal intervals on the bottom of the housing, with iron rings installed inside the bottom holes; a connecting ring installed inside the bottom holes, with a magnet arranged on the outside of the connecting ring near the iron ring, a silicone cross valve installed inside the connecting ring, and an extension ring arranged on the bottom outer edge of the connecting ring; and a lug located on the top of the housing. This utility model uses the silicone cross valve to form a dynamic seal against dust by adhering to the wires, and the magnetic attraction between the iron ring and the magnet enables quick assembly and disassembly of the connecting ring without tools, thus ensuring dustproof protection and improving operational convenience.

The invention discloses a dynamic low-oxygen structure on the first aspect, which comprises a cover plate with a cleaning channel arranged in the middle in a penetrating manner; the cleaning module is arranged on the first side of the cover plate; the heating table is arranged on the second side of the cover plate, a cleaning area is arranged on the side, close to the cover plate, of the heating table, and a cleaning cavity is formed by the cleaning area and the second side of the cover plate; the steel belt is arranged on the cleaning module; the first gas channel is arranged on one side of the heating table; secondly, the invention discloses a plasma cleaning machine which comprises the dynamic low-oxygen structure. The cleaning area is arranged at the top of the heating table, the cleaning cavity is formed between the cleaning area and the cover plate, the cleaning module drives the steel belt to move, dynamic sealing of the cleaning channel is achieved, protective gas is inflated through the first gas channel and the second gas channel, the oxygen content in the cleaning cavity is reduced, and the wafer cleaning effect is guaranteed; the consumption of protective gas is reduced, the production cost is reduced, the equipment size is reduced, and meanwhile online unmanned automatic production is achieved.