82results about How to "Smooth down" patented technology

The invention relates to a lignite drying and carbonization quality-improving device, in particular to a lignite drying and carbonization quality-improving tower with a reciprocating and turning-back rolling bed. In the quality-improving tower, a drying and carbonization reaction chamber is surrounded by a furnace lining; the top of the reaction chamber is provided with a coal conduit, and the inside of the reaction chamber is divided into multiple layers of drying chambers and multiple layers of carbonization chambers from top to bottom; each drying chamber and each carbonization chamber areprovided with an air inlet and an air outlet for introducing and discharging drier or carbonization agent; and each inclined reciprocating grate is installed in each drying chamber and each carbonization chamber, the inclination directions of the reciprocating grates form staggered arrangement from top to bottom, each reciprocating grate is provided with an eccentric drive device, an interlay barrier below the tail part of each reciprocating grate is provided with an interlayer coal seal, a coke quenching tank is connected to the lower part of the interlay coal seal of the carbonization chamber at the bottom layer, and a coal discharging screw conveyer is arranged at the bottom part of the coke quenching tank. The invention solves the problems of raised dust and gas explosion, poor coal layer air permeability, low gas-solid heat transfer efficiency, raw coal burst, nonuniform coal layer temperature and poor regulation and control maneuverability for different sections existing in the traditional lignite drying and carbonization device.

The invention provides a dragging, translating and lowering device for dismantling a pier top beam section and a pier. The device comprises four supporting points, wherein each supporting point comprises four steel pipe piles, four steel pipe supporting frames, four transverse girders, four longitudinal translation beams, two longitudinal translation devices and two lifting and lowering systems; transverse translation beams can move in a transverse direction; the longitudinal translation devices are arranged at the upper parts of the transverse translation beams; the lifting and lowering systems are fixed on the longitudinal translation devices; the transverse translation beams are used for adjusting transverse positions of the lifting and lowering systems; the longitudinal translation devices are used for adjusting longitudinal positions of the lifting and lowering systems; and the lifting and lowering systems are used for lifting or lowering the pier top beam section and the pier. A dragging, translating and lowering method for dismantling the pier top beam section and the pier, provided by the invention, is capable of economically and efficiently solving a dismantling problem of a pier top box beam and pier structure under in the absence of the hoisting of a crane, suitable for dismantling the pier top beam section and the pier of a beam bridge or a bridge with a concrete girder and especially suitable for dismantling engineering for the pier top box beam and pier structure of a multi-span continuous beam bridge using a whole-span lowering dismantling technology.

The invention discloses a method for integrally disassembling a descending movable formwork bridging machine. The equipment for disassembling the movable formwork bridging machine comprises a bottom horizontal support system, two main girders, two nose girders, an external mold system, a front portal and a rear portal, wherein the bottom horizontal support system comprises two sets of pier-side brackets, a support trolley is installed on the pier-side brackets, and the two main girders are connected through multiple connection girders. The method comprises the following steps: (1) dismantling the front and rear portal and the nose girders; (2) installation of lifting system: installing a lifting system for lifting the disassembled movable formwork bridging machine on a constructed continuous girder by adopting lifting equipment; (3) hoisting the main girders, and longitudinally moving the pier-side brackets and the support trolley; (4) downward moving; (5) dismantling the pier-side brackets and the support trolley; (6) further downward moving; and (7) disassembling on the ground. The method disclosed by the invention is simple in step, reasonable in design, convenient in disassembly of the bridging machine, good in using effect, and capable of simply, conveniently and quickly finishing the disassembly processes of the movable formwork bridging machine; and the disassembly processes are safe, economical and practical.

The invention discloses a water quality sampling unmanned catamaran and a sampling method thereof, and belongs to the technical field of environment monitoring. The water quality sampling unmanned catamaran comprises two catamaran bodies arranged in parallel, wherein the two catamaran bodies are in rigid connection through a fixed trapezoidal frame above the catamaran bodies; an upper platform anda lower platform are arranged on the trapezoidal frame; a cylindrical tube penetrating through the upper platform and the lower platform is arranged in the middle of the trapezoidal frame in a penetrating way; a windlass corresponding to the cylindrical tube is arranged on the upper platform; a bearing support frame matched with the windlass is also arranged on the upper platform; a water collecting pipe is wound on the windlass; one end, passing through the cylindrical tube, of the water collecting pipe is connected with a water sample collector; the other end of the water collecting pipe isconnected with a peristaltic pump fixed on the upper platform; and a water sample distributor is arranged on the lower platform, and is connected with the peristaltic pump. Through the arrangement ofa water sample collection device on the unmanned catamaran in parallel arrangement, the stability of the water sample collection device in the unmanned catamaran moving process is improved.

The invention provides a terrestrial deep drilling rig energy saving power catwalk, mainly consisting of a plate turnover feeding mechanism, a horizontal pushing trolley, a plate turnover back feeding mechanism, a V wheel lifting mechanism, a slope trolley, a lifting manipulator and a drilling platform surface V wheel trolley. The main body of the catwalk is divided into a horizontal pushing portion and a slope lifting portion, wherein the horizontal pushing portion is a single slideway, the slope lifting portion is a three-slideway, when a drill stem runs upward, only the middle slideway of the slope lifting portion is used, when the drill stem runs downward, the slideways on two sides of the slope portion are used. The catwalk can automatically realize a series of functions, i.e., the drill stem is released at a low position, the drill stem can go up to a drilling platform stably and get down from the drilling platform successfully, accordingly, the number of drillers is reduced, the labor intensity of workers is relieved, the time for making a connection is shortened, the well construction period and cost are reduced, and the energy can be saved greatly.

The invention relates to the field of bridge dismounting, in particular to a whole striding bridge lowering dismounting system based on ground supporting and a construction method thereof. The system comprises at least two sets of supporting structures used for supporting a lowering box beam. Each supporting structure comprises a main beam and two supporting frames located at the two ends of the main beam, wherein the two ends of the main beam are fixed to the main supporting frames, the main beam is arranged in the transverse direction, a lowering power system is arranged at the upper end of the main beam and connected with a sling, and a pocket hoisting device used for hoisting the lowering box beam is arranged at the lower end of the sling. The system is simple in structure, convenient to operate and high in construction safety, environmental friendliness is achieved, energy is saved, and extremely high popularization value is achieved.

The invention relates to a construction method of a single-pipe grouting bottom-expanding cast-in-place pile, and belongs to the field of cast-in-place piles. The construction method comprises the following steps that 1, a spiral pile machine is used for drilling a foundation to form a pile hole, meanwhile, wall protection slurry is poured, after a drill bit reaches a preset position, a drill rodis lifted, the bottom of the pile hole is expanded, and a pile bottom expanding part is formed; 2, the pile hole is cleaned; 3, a reinforcement cage is placed into the pile hole, and the bottom of thereinforcement cage is inserted into the pile bottom expanding part; 4, a first guide mechanism and a second guide mechanism are installed at the position, close to the pile hole, of the ground and the top of the reinforcement cage correspondingly, and a pouring guide pipe is inserted into the pile hole through the first guide mechanism and the second guide mechanism; and 5, a concrete pump is connected to the top of the pouring guide pipe, and pile forming concrete slurry is poured into the pouring guide pipe. The construction method has the effect of keeping the pouring guide pipe stable when being put down.

The invention provides a plunger gas recovery device capable of achieving continuous production of a gas well without well shutdown. The main purpose of the invention is to provide a novel plunger gas recovery device with good performances and a reliable structure so as to achieve the continuous production of the gas well and improve the drainage efficiency. The plunger gas recovery device is characterized by including a push rod, a blowout preventer, a shaped spring, a rubber sleeve of the shaped spring, an assembled piston, a piston ball, a piston ball fixing piece, a cushion pad, a maintaining steel ring of the cushion pad, a cushion spring and the like; the assembled piston includes an upper piston body and a lower piston body, the upper piston body, the lower piston body and a ball body are combined to form a whole piston structure, the upper piston is connected with a steel ball fixing piece, the matched shaped spring and a matched sleeve cylinder structure are connected with the upper piston, the lower portion of an oil pipe is provided with the cushion pad and the maintaining steel ring of the cushion pad, and the cushion spring is fixed between a lower structure and the cushion pad; when moving to the largest height, the piston is fixedly connected with the push rod, and the total length of the push rod is about 1.5 times the total length of the assembled piston so as to push the ball body to move down without the well shutdown.

The invention provides an anti-erosion and no sand card fracturing sliding bush which can be connected with an oil pipe and arranged inside a bushing. The anti-erosion and no sand card fracturing sliding bush compromises a shell body. The upper end of the shell body is connected with an upper contact, and the lower end of the shell body is connected with a closed outer cylinder. A plurality of open holes is arranged on the circumferential direction of the closed outer cylinder. The outer shell is provided with a movable piston cylinder. The anti-erosion and no sand card fracturing sliding bush also compromises a sand blasting body. The upper end of the sand blasting body is stuck between the shell body and the piston cylinder. The upper end of the sand blasting body is connected with a lower contact. A nozzle is embedded inside the sand blasting body. The nozzle is provided with a plurality of bell shaped spray holes along the circumferential direction. The spray holes can be communicated with the open holes. The inside of the sand blasting is provided with sliding bush which is used for sealing the spray holes, and the sliding bush is connected with the lower contact detachably. The anti-erosion and no sand card fracturing sliding bush has the advantages of being capable of reducing casing damage during fracturing, and avoiding the sand card when lifting the pope, being thorough in back flushing, and high efficient in fracturing.

The invention discloses a heating coil for preparing a zone-melting and large-diameter monocrystal. A circular ring-shaped pin hole penetrating through the upper surface and the lower surface of the coil is formed in the center of the coil, four flow guide seams penetrating through the upper surface and the lower surface of the coil are formed in the periphery of the pin hole at equal intervals, and one flow guide seam extends out of the coil and is connected with a flange of a connection electrode; the structure of the other three flow guide seams is that the part connected with the pin holeis a crack with consistent width, and the part away from the pin hole is of a V-shaped structure. According to the coil, one stable and uniform growing thermal field can be provided, the melting condition of loading is improved, problems of burring, wrapping, belt forming and the like are solved, the loading is enabled to be smooth, meanwhile, temperature gradient and thermal stress in a melt canbe reduced, crystallization rate is increased, besides, raw materials for preparation of the coil are saved, and the service life of the coil is prolonged.

Containers are to be mounted with cap having structure usable without removing the cap. Cap with an openable lid of the present invention is that lid is rotated when reactive force against force added on pushing portion 3 reaches from hinge 4 to the lid 2 since radius of rotation of the hinge 4 provided at a predetermined position is smaller than radius of rotation of the pushing portion 3. Further, push button 5 is pushed in connection with opening of the lid since the pushing portion 3 is provided at the position where the pushing portion is adjacent to top edge of the push button 5 at the lid 2 being opened by the hinge 4. Thus, the force reaches the push button 5 through the pushing portion 3, and backward of the push button inclines. This makes it possible to realize a structure of discharging contents of container without removing cap.

The invention relates to the technical field of car bodies, in particular to a side-wall forming die and a side-wall forming process. The side-wall forming die comprises an upper die body, a lower dieseat, a convex die, a compensation concave die, an inner blank holder and an outer blank holder, wherein the convex die is arranged on the lower die seat; the compensation concave die is movably arranged on the upper die body; the inner blank holder is movably arranged inside the convex die and matched with the pressing surface of the compensation concave die; the outer blank holder is movably arranged on the outer side of the convex die; inner secondary ejector rods are arranged on the inner blank holder; outer secondary ejector rods are arranged on the outer blank holder; the length of eachinner secondary ejector rod is less than that of each outer secondary ejector rod; and in the die closing state, the lower end surface of the inner secondary ejector rod is delta h higher than that of the outer secondary ejector rod. By adoption of the side-wall forming die and the side-wall forming process provided by the invention, the drawing depth of a side-wall door opening can be reduced, and the problem that an integrally-formed aluminum plate cracks in the side-wall forming course can be avoided.

The invention discloses a method for staged fracturing of a well cementation casing string and a tool for the method. The method and the tool are particularly suitable for implementation of staged fracturing and matched well completion after well cementation in oil-gas well engineering. The method is characterized in that hydraulic reducing ball seat sleeve sliding sleeve switch tools (3) are connected in series in a casing string (2) to descend a well, when the tools go down to the designed depth, cement paste is pumped into the well for well cementation, a sleeve is fixed in a ground layer (1), after well cementation, the sealing sleeves of all the hydraulic reducing ball seat sleeve sliding sleeve switch tools (3) are opened in sequence by colliding rubber plugs, cement paste on the inner wall of the casing string is removed, the pressure is built, the hydraulic reducing ball seat sleeve sliding sleeve switch tools (3) seal ball seats for diameter change, and the diameters of the ball seats are increased from the bottom of the well to the top in sequence, so that ball throwing staged fracturing operation can be carried out. Compared with a similar technology, the method and the tool have the benefits that before colliding, the casing string has a drift diameter which is the same in diameter so as to ensure that the well cementation colliding rubber plugs descend smoothly; cement takes the place of cement paste in the clean casing string, so that the success rate of colliding is high.

Disclosed are a method and apparatus for sending a signal of a soft handover region in an unbalanced area of a heterogeneous network, which relate to the technical field of communications, and can prevent a user equipment in an unbalanced area from bringing unstable uplink interferences to a micro base station in a heterogeneous network. In the embodiments of the present invention, a micro base station in a heterogeneous network receives a signal sent by a user equipment in an unbalanced area; the micro base station acquires a first power control command according to the received power of the signal; and the micro base station sends the first power control command to the user equipment so that the user equipment adjusts the sending power of the signal according to the first power control command. The solution provided in the embodiments of the present invention is applicable to the sending of a signal of a soft handover region in an unbalanced area of a heterogeneous network.

The invention discloses an efficient seedling growing device for rice planting. The efficient seedling growing device comprises a culturing chamber, an opened cuboid structure is arranged at one sideof the culturing chamber, a slide plate is slidably inserted to the side of the culturing chamber, the culturing chamber is divided into a first cavity and a second cavity by the slide plate, severalfixed plates are equidistantly installed on the inner wall of the first cavity in the height direction of the culturing chamber, rectangular ventilation holes and strip-shaped second slide holes are formed in the tops of the fixed plates, a seedling growing pot of a cuboid structure is arranged at the top of each fix plate, a second motor and two second fixed bases are installed at the bottom of each fixed plate, a second lead screw is rotatably connected between every two second fixed bases, and one end of each second lead screw penetrates through the corresponding second fixed bases and is fixedly connected with an output shaft of the corresponding second motor. The efficient seedling growing device can be arranged into many layers, and is very convenient to take and use; meanwhile, a proper culturing environment can be provided, which is beneficial to the growth of rice seedlings.

The invention provides a boss coil for preparing a zone melting single-crystal, which comprises a coil, a cooling water pipe and a blowing gas path, wherein the cooling water pipe is embedded into a framework of the coil; the coil is of a circular ring-shaped structure of which the center is provided with coil holes; an annular step which sinks to the inside of the coil is arranged on the upper surface of the coil; a plane is formed on the step and is provided with an annular boss; one end of the bottom of the step is connected with the upper edge of the inner circle of the coil to form an inclined plane which inclines downward; the lower surface of the coil is an inclined plane which inclines above the center of the coil; and the blowing gas path horizontally penetrates through the lower part of the coil from the outer side and penetrates out of the lower surface of the coil. The boss coil provided by the invention can provide a stable and uniform growth thermal field to ensure that molten silicon descends smoothly, the crystal forming rate and equipment moving rate are high, and the conditions of edge thorns, melting zone solidification, melting zone out-of-waistband and the like are avoided.

The invention relates to a wheelchair device with an assistant function. The wheelchair device comprises a side frame group containing two side frames, two stand pipes, a console group containing two consoles, a deployment mechanism, at least one driving gear group and at least one transmission gear, wherein a front cross rod is pivoted between the two side frames, each side frame is provided with a wheel set; the two stand pipes are separately arranged in sleeves, each stand pipe contains a rack division; the two consoles are arranged above the side frame group, the front end of the console group is pivoted with the side frame group, a back cross rod is pivoted between the two consoles; the two ends of the deployment mechanism are separately connected with the front and back cross rods in a transmission manner; the driving gear group is arranged on the front of the side frames and linked with the front cross rod; and the transmission gear is pivoted on the front end of the side frames. By using the wheelchair device of the invention, when two lifting arms move up, the two stand pipes can move down so that the applied force on the stand pipes can not be easy to disperse in the driving process, the two stand pipes can move down smoothly and the safety of the wheelchair device with the assistant function can be increased.

The invention discloses a building construction plummet capable of conveniently taking up and paying off a winding line. The plummet comprises a cylindrical installation shell, a plummet body is mounted on the lower portion of the cylindrical installation shell, a first circular opening is formed in the surface of the right side of the cylindrical installation shell, a first rotating bearing is embedded into the first circular opening, a second rotating bearing matched with the first rotating bearing is arranged on the surface of the inner left side of the cylindrical installation shell, a horizontal rotating shaft overlapped with the first rotating bearing and the second rotating bearing is arranged in the cylindrical installation shell, a line wheel sleeves the surface of the horizontalrotating shaft and is positioned in the cylindrical installation shell, a circular opening is formed in the center of the lower surface of the cylindrical installation shell, and the winding line fixedly connected with the upper surface of the plummet body is wound on the line wheel. The plummet has the advantages that when the plummet is used, the plummet is more stably placed downwards by the aid of the line wheel, convenient to operate, safer and not easy to slip out of the hand.

The invention relates to the technical field of natural gas and oil exploitation, and discloses a plunger. The plunger comprises a core body, a sealing gasket, a first elastic reset piece, an outer flow limiting pipe and an inner flow limiting column; a fluid channel extending in the axial direction of the core body is arranged in the core body, the outer flow limiting pipe is arranged in the fluid channel, a plurality of outer flow limiting rings protruding inwards in the radial direction are arranged on the inner circumferential face of the outer flow limiting pipe, the plurality of outer flow limiting rings are arranged at intervals in the axial direction, and the inner flow limiting column is arranged in the outer flow limiting pipe; a plurality of inner flow limiting rings protruding outwards in the radial direction are arranged on the outer circumferential face of the inner flow limiting column and arranged at intervals in the axial direction; the inner flow limiting rings and the outer flow limiting rings are alternately arranged in the axial direction; the outer diameters of the inner flow limiting rings are larger than the inner diameters of the outer flow limiting rings; the outer diameters of the inner flow limiting rings are smaller than the inner diameter of the outer flow limiting pipe; and the distance between adjacent outer flow limiting rings is larger than the thickness of each inner flow limiting ring. The plunger can smoothly descend in a well shut-in state while ensuring the lifting efficiency.

The invention discloses a flexible electric heating sucker rod which belongs to the technical field of oil extraction equipment in oil fields. The outer layer is a steel wire rope layer; the flexible electric heating sucker rod is characterized by comprising heating copper cores in the center; an insulation layer is arranged between the steel wire rope layer and the heating copper cores; a rigid connector is arranged at the tail end of the flexible electric heating sucker rod; and reliable conduction and connection between the flexible electric heating sucker rod and an oil-well pump piston or a weight-increasing electric heating rod through the rigid connector are realized. The flexible electric heating sucker rod is simple in structure, good in heating effect, convenient to use, safe and reliable, high in overall strength and working efficiency, obvious in economic effect, good in applicability, and particularly suitable for extraction of large-slope high-coagulation heavy oil wells, reduces the failure frequency, and saves electric energy and heat energy.

The invention discloses a bending method of an efficient bending machine, and belongs to the technical field of the bending machine. An oil inlet of an oil pump is connected with an oil tank; an oil outlet of the oil pump is connected with a port P of a three-position four-way electromagnetic directional valve through a pipeline; a port T of the three-position four-way electromagnetic directional valve is connected with the oil tank through a pipeline; a port A of the three-position four-way electromagnetic directional valve is connected to an upper cavity of a hydraulic cylinder through a superposing valve set; a port B of the three-position four-way electromagnetic directional valve is connected to the upper cavity of the hydraulic cylinder through a superposing valve set; the upper cavity of the hydraulic cylinder is further connected with an energy accumulator through a hydraulic-control one-way valve. By improving a hydraulic system of the bending machine, the whole plate bending process of quickly descending, feeding, maintaining pressure and decompressing is efficiently controlled, high speed and stability of the quick descending stage as well as stability of the feeding stage are guaranteed; and meanwhile, the pressure maintaining effect is good, and the oil pressure of the upper cavity of the oil cylinder at the pressure maintaining stage is stable, so that the bending quality of plates is guaranteed.

The invention relates to a gas-based reduced iron shaft furnace which sequentially comprises a receiving device, a shaft furnace body and a discharging device from top to bottom. A main reaction area of the shaft furnace body is of a circular truncated cone structure, a thermal reduction gas inlet is located in the lower section of the reaction area, two sets of temperature measuring devices are arranged at different heights of the reaction area of the shaft furnace body, the other set of temperature measuring devices are arranged above the thermal reduction gas inlet, and a material receiving bell is arranged on the inner side of the top of the shaft furnace body. The top of the shaft furnace body is provided with an ascending pipe for recycling furnace top circulating gas, and a lower cooling area of the shaft furnace body is provided with a discharging and guiding device. The shaft furnace is simple in structure and small in size, production of the shaft furnace is easier to control, and the overall shaft furnace equipment manufacturing and operating cost is low.

The invention belongs to the technical field of gas-based direct reduction iron-making, and particularly discloses a gas-based reduction shaft furnace. A shaft furnace body comprises a preheating section, a reduction section and a cooling section, wherein the reduction section is in a big-end-down circular truncated cone shape; the bottom of the reduction section is connected with the cooling section; the upper portion of the reduction section is connected with the preheating section; and an air guide wall is arranged in the reduction section and coincides with the axis of the reduction section. By changing the angle between the reduction section furnace body and the horizontal plane, the furnace profile adapts to volume expansion during pellet reduction, extrusion force between pellets and a furnace wall as well as between the pellets can be reduced, and the situation that liquid generated by the pellets with high temperature is consecutive and bonded into blocks is effectively restrained; the air permeability in the shaft furnace is enhanced, so that the shaft furnace runs smoothly; and the air guide wall is arranged in the reduction section, so that reduction air flow can be uniformly distributed in the shaft furnace.

The invention discloses a pumping device for PE (polyethylene) screen pipe well completion of a coal-bed gas horizontal well and a pumping method, and belongs to the technical field of coal-bed gas. The upper end of a body is a pressure bearing surface; a guide hole is formed in the middle part of the pressure bearing surface; a threaded connection part is arranged in the guide hole; the lower end of the body is a hemisphere guide head; a drainage hole is connected with the guide hole; the other end of the drainage hole is arranged on the middle part of the hemisphere guide head; a part, which is connected with the guide hole, of the drainage hole is a slope. The pumping device has the effects that enough impact force can be generated, and a screen pipe is successfully driven to move downwards to reach a target layer; a proper clearance is reserved between the outer rim of the pumping device and a drill rod, so that the phenomenon that the moving direction of the screen pipe is deflected or the screen pipe is blocked due to a fact that impurity particles in drilling fluid are clamped in the clearance is effectively avoided; in the process of driving the screen pipe to move downwards, the screen pipe can be successfully driven to pass through a joint of the drill rod and a bent section of a borehole, so that a clamping accident is avoided.

The invention belongs to the technical field of metallurgy, and in particular relates to a cooling gas system used in the cooling section of a shaft furnace. The cooling gas system includes a cooling gas intake pipeline, a cooling gas intake pipeline, a cooling and dust removal device, a pressure raising device, an intake switching valve group, a carburizing gas device, and a furnace bottom material temperature measurement device, wherein the cooling gas intake pipeline Including the intake ring pipe and multiple air inlets; the cooling air collection pipeline includes the air collection ring pipe, multiple air collection ports and multiple air collection hoods; the cooling and dust removal device is connected to the furnace outlet; the air inlet of the intake switching valve group They are respectively connected with the pressure raising device and the carburizing gas device, and the gas outlet is connected with the furnace inlet; the furnace bottom material temperature measuring device is arranged under the inlet pipeline. Therefore, the cooling air system adopts multiple air inlets, multiple air intake ports and air intake hoods evenly distributed in the ring pipe, which ensures the uniformity of air intake in the cooling section and realizes efficient recovery of cooling air, thus reducing the unused cooling air. Effective recovery and rising to the reduction section will adversely affect the reduction reaction.

The invention discloses a pressure vessel refueling top cover lifting appliance for a marine nuclear power platform and a hoisting method thereof, and relates to the field of pressure vessel refueling. A pressure vessel comprises a top cover and a vessel body, a vessel lifting lug is arranged on the upper end face of the top cover, and a primary shielding water tank is arranged at the periphery ofthe pressure vessel. The top cover lifting appliance comprises an upper end connecting part and a lower end power part, the upper end connecting part is detachably fixed to the vessel lifting lug, the lower end power part is fixedly connected with the upper end connecting part, and the lower end power part is used for acting on the primary shielding water tank and supplying the downward installing and upward detaching power to the top cover through the upper end connecting part. The pressure vessel refueling top cover lifting appliance can be applied to pressure vessel top cover lifting and installing operation of the marine nuclear power platform.

The invention discloses oxygen-free copper suspension smelting equipment. The equipment comprises a standard base, a smelting furnace body, a capping furnace cover and a connecting mechanism, whereinthe connecting mechanism comprises an extending cylinder, dynamometers, a suspension disc and connecting columns, a sealing ring is connected to the top of the outer ring of the extending cylinder ina sleeved mode, the two sides of the middle of the top of the suspension disc are provided with special-shaped holes respectively, compensation springs are fixedly welded to the top of the outer ringof the connecting columns, and the top of the compensation springs penetrate through the extending cylinder and are fixedly connected with the bottoms of the dynamometers. According to the oxygen-freecopper suspension smelting equipment, suspension smelting is carried out by adopting a tray-type clamping and lifting mode, so that metal with various properties can be better applied, both magneticand non-magnetic metal smelting can be carried out, the suspension disc can effectively control the application range and area of electromagnetic force, and the suspension state of the whole smeltingmetal is greatly controlled, so that the metal in the suspension state cannot cause the occurrence of a smelting accident due to uneven stress.

The invention discloses a bending method of a high-efficiency bending machine and belongs to the technical field of bending machines. In the present invention, the oil inlet of the oil pump is connected to the oil tank, and the oil outlet of the oil pump is connected to the P port of the three-position four-way electromagnetic reversing valve through a pipeline; the T port of the three-position four-way electromagnetic reversing valve is connected to the oil tank through a pipeline. Connected, the A port of the three-position four-way electromagnetic directional valve is connected to the lower chamber of the hydraulic cylinder through the superimposed valve group, and the B port of the three-position four-way electromagnetic directional valve is connected to the upper chamber of the hydraulic cylinder through the superimposed valve group. The upper chamber of the hydraulic cylinder is also connected to the energy accumulator through a hydraulically controlled one-way valve. By improving the hydraulic system of the bending machine, the present invention can efficiently control the entire process of plate bending: fast lowering, working advance, pressure maintaining, and pressure relief, ensuring high speed and stability in the fast lowering stage and stability in the working advanced stage. Stability and good pressure-holding effect. The oil pressure in the upper chamber of the cylinder is stable during the pressure-holding stage, thus ensuring the bending quality of the plate.

The invention discloses an oil-immersed three-phase transformer which comprises a transformer body, two extending pieces, two blocking assemblies and two fire extinguishing assemblies. The two extending pieces are correspondingly installed on the two sides of the lower surface of the transformer body. The two fire extinguishing assemblies are installed on the two sides of the upper surface of the transformer body in parallel, and the output ends of the two fire extinguishing assemblies face the transformer body. The two blocking assemblies are correspondingly installed on one sides of the fire extinguishing assemblies, and the blocking assemblies can cover the two side walls of the transformer body. The fire extinguishing assemblies are installed on the two sides of the upper surface of the transformer body, the wiring position of the transformer body is fully covered, and the problem that fire is transmitted along wires is avoided. The two side walls of the transformer body are covered with fireproof cloth for fire prevention under the assistance of the blocking assemblies, rapid spreading of fire on the transformer body is avoided, meanwhile, the transformer body can be blocked, gas flowing is reduced, and the fire extinguishing period is shortened.

The invention relates to the technical field of water conservancy and hydropower, in particular to a fixing device for a water conservancy and hydropower buried pipe and a using method thereof. The fixing device comprises an outer frame, a winch, a steel wire rope and an inner frame; the winch is fixedly connected to the top end of the outer frame; the steel wire rope penetrates through the inner side of the winch; the inner frame is fixedly connected to the bottom end of the steel wire rope; a clamping and lowering mechanism is arranged on the inner side of the bottom end of the inner frame; the clamping and lowering mechanism comprises a fixing base, a first motor, a first screw rod, a push plate, a torsion spring, an L-shaped limiting rod, a lower clamping arc plate and a limiting block; the push plate is slidably connected to the inner side of the fixing base, and the lower clamping arc plate is rotatably connected to one end of the push plate; and the inner wall surface of the inner frame is fixedly connected with the limiting block. According to the fixing device for the water conservancy and hydropower buried pipe provided by the invention, a pipeline can be clamped through the arranged clamping and lowering mechanism and the lower clamping arc plate, so that the pipeline is fixed on the inner side of the inner frame.