42results about How to "Guaranteed positive pressure" patented technology

The invention discloses a light spot and powder spot automatic collaboration controlled laser metal added material manufacturing device and a method. The device comprises a connecting joint, a laser focusing head and a sleeve respectively fixed at the upper end and the lower end of the connecting joint, a mobile sleeve slidingly coating the sleeve, a powder feeding nozzle fixed at the lower end of the mobile sleeve, and a numerical control worktable for placing workpieces; the laser focusing head is used for forming light spots on workpiece machined surfaces of a focusing mirror; the powder feeding nozzle is used for gathering powder currents to feed in a machining position to form powder spots on the workpiece machined surfaces; the centers of the light spots and the powder spots are overlapped always; the numerical control worktable is used for driving the workpieces to perform the space movement corresponding to the focusing mirror to control the out-of-focus distance; and a driving device is arranged on the mobile sleeve for driving the powder feeding nozzle to move up and down through the mobile sleeve to control the sizes of the powder spots. When the method forms thick and large workpieces with the cladding layer sizes exceeding the adjusting range, the profile scanning and filling scanning combined path formation is adopted.

A hinge type dumper hydraulic oil tank comprises a hydraulic oil tank body. An oil return cavity is formed in the top face in a cavity body of the hydraulic oil tank body. An oil return pipe communicating with the oil return cavity is arranged on the side face of the oil return cavity. The other end of the oil return pipe communicates with an oil return port, wherein the oil return port is fixed to the side face of the hydraulic oil tank body and is close to the position of the bottom face, and the oil return port communicates with an outer hydraulic system. The hinge type dumper hydraulic oil tank further comprises a plurality of oil return filters. Oil inlets of the oil return filters are arranged in a cavity body of the oil return cavity, and after penetrating out of the bottom face of the oil return cavity, oil outlets of the oil return filters extend towards the cavity body of the hydraulic oil tank body; and the part between the radial outer circumferential face of each oil return filter and the oil return cavity is sealed. The novel hinge type dumper hydraulic oil tank is provided, the hydraulic system oil liquid cleanliness can be achieved, oil suction and return oil filter element replacement is simple, and stable running of the hydraulic system is guaranteed.

The invention discloses a positive-pressure joint for needleless medicated transfusion, belonging to the field of medical apparatus and instruments. The positive-pressure joint comprises a rubber plug inner core, a hollow rubber plug, a connecting tube socket and a shell of which the upper and lower ends are through, wherein the connecting tube socket and the lower end of the shell are in connected in a sleeving mode, and a horizontal flow guiding groove, which divides the bottom face of the internal wall of the connecting tube socket horizontally and equally, and two exhausting through holes, which are correspondingly located at the two sides of the horizontal flow guiding groove, are formed in the bottom face of the internal wall of the connecting tube socket; a transfusion tube is inserted to the middle part of the horizontal flow guiding groove; a rubber plug shell which is coaxial with the shell is arranged in the shell, the top face of the rubber plug shell is lower than the top face of the shell, the hollow rubber plug is coaxially located in the rubber plug shell and is supported by the bottom face of the internal wall of the rubber plug shell, sealing structures are respectively formed between the outer circumferential wall of the hollow rubber plug and the inner circumferential wall of the shell and between the outer circumferential wall of the hollow rubber plug and the inner circumferential wall of the rubber plug shell, and two exhausting pipes are further arranged at the bottom of the rubber plug shell and are connected with the two exhausting through holes correspondingly in an inserting mode; at least one longitudinal flow guiding groove which can be communicated with the horizontal flow guiding groove is formed between the radial direction of the outer circumferential wall of the rubber plug shell and the radial direction of the inner circumferential wall of the shell.

The invention relates to a sensor, more particularly to a load sensor. The load sensor comprises a stressed elastic main body, a strain gauge set and a bottom cap. Central through holes are arranged at the stressed elastic main body; and a stressed platform, a force guide post and a stepped pedestal are arranged at the stressed elastic main body from top to bottom, wherein the stressed platform, the force guide post and the stepped pedestal are arranged coaxially. An annular stressed plane is arranged on the stressed platform; and a first annular force guide angle that is extended downwardly along the bottom of the inner wall of the force guide post is arranged at a step surface of the top central through hole. The pedestal is a two-layer stepped pedestal; the upper layer surface of the pedestal is provided with a first annular force guide groove that is extended downwardly along the periphery of the bottom of the outer wall of the force guide post; the lower layer surface of the pedestal is provided with an annular stressed isolation groove that is extended downwardly along the periphery of the bottom of the upper layer outer wall of the pedestal; annular grooves are arranged at the bottom of the pedestal and annular stressed releasing grooves are arranged at bottoms of the annular grooves; annular paster surfaces are arranged at bottoms of the annular grooves; and a lead hole that is communicated with the lower layer periphery of the pedestal is arranged at a side wall of one of the annular grooves. Besides, the strain gauge set is arranged on the strain gauge set; and leads of the strain gauge set is externally connected to a measuring circuit or a strain gauge through the lead hole.

The invention discloses a needless connection piece. The needless connection piece comprises a needless connector and a rubber plug, wherein the needless connector comprises an access port, an output port and a cavity with an inner cavity, an inner core seat is arranged in the inner cavity, the rubber plug comprises a solid portion and a hollow portion, at least one groove is formed in the side wall of the solid portion, at least one rib used to increase elastic recovery ability of the hollow portion is arranged in the hollow portion, the rubber plug is arranged in the inner cavity of the needless connector, the solid portion and the access port of the needless connector form a seal structure, and the hollow portion is installed in the inner core seat in connection mode. According to the needless connection piece, the at least one rib used to increase the elastic recovery ability of the hollow portion is arranged on the inner wall of the hollow portion. The needless connection piece has strong resilience force, guarantees positive pressure, enables the rubber plug to have enough mechanical strength, uses the guiding rib which is in S shape and has strong resilience force, enables the guiding rib to limit the deformation direction of the rubber plug, and prevents the rubber plug from jamming in the inner cavity.

The invention relates to a low-noise two-way servo pump source which comprises an oil tank, a pump source assembly, a valve control set, a hydraulic cylinder, a cooler and an oil return filter. The pump source assembly comprises a double-shaft-extension servo motor, a first hydraulic pump, a second hydraulic pump, a first clutch and a second clutch. The valve control sets comprise the first valve control set and the second valve control set, the hydraulic cylinder comprises a cylinder body and a piston, and the piston is slidably connected to an inner cavity of the cylinder body and divides the inner cavity of the cylinder body into a first cavity and a second cavity. Reciprocating motion of the hydraulic cylinder is achieved through forward rotation and reverse rotation alternate motion of the double-shaft-extension servo motor, the reciprocating motion speed of the hydraulic cylinder is achieved by adjusting the rotating speed of the double-shaft-extension servo motor, and therefore bidirectional speed regulation and direction control of the whole hydraulic transmission system are achieved. The device is simple in structure, low in noise, high in reliability and wide in speed regulation range.

The invention provides an auto-disposal auto-exhaustion anti-reflux needleless infusion set facilitating clinical operation. The needleless infusion set has auto-exhaustion and automatic liquid stopping functions, an infusion hose replaces a steel needle, and the steel needle is prevented from piercing the blood vessel due to walking or other actions, resulting in that medical fluid flows into subcutaneous tissue to cause bulging or other injury. When the infusion set is in use, the steel needle is fixed on a base to avoid injury to medical staff. After use, the infusion set can be disposed automatically to avoid secondary utilization by lawbreakers. The other purpose of the infusion set is to improve a liquid medicine filter, the improved filter can filter out insoluble particles in the liquid medicine to the uttermost extent, and medication safety is assured.

The invention discloses a fresh air purifying method. The method sequentially performs the following steps of initial-effect filtration treatment, medium-effect filtration treatment, anti-freezing preheating treatment, first-level surface cooling dehumidification treatment, water spraying treatment, second-level surface cooling treatment, heating treatment, humidification treatment, chemical adsorption treatment, medium-effect filtration treatment and high-effect filtration treatment on fresh air. The invention further provides a fresh air purifying unit. The fresh air purifying unit is provided with an air inlet section, an initial-effect filtration section, a medium-effect filtration section, an anti-freezing preheating section, a first-level surface cooling section, a water spraying section, a second-level surface cooling section, a heating section, a humidification section, a fan section, a flow equalization section, a chemical adsorption section, a medium-effect filtration section, a high-effect filtration section and an air outlet section.

The invention discloses a safety operation method for a gaspipe network in gasometer-free single-seated blast furnace production. A blast furnace is an ironmaking blast furnace; the gaspipe network is further connected with a gas consumption unit, and connected with a low-pressure nitrogen gas pipe network through a nitrogen gas pipeline. The invention further provides a safety operation method for the gaspipe network. By adopting the technical scheme, under the situation that the pipe network is in loss of pressure, gas consumption users have time to turn off a burner valve, so as to guarantee the positive pressure of the pipe network, prevent the occurrence of back fire explosion accidents and guarantee the operation safety and stability of the pipe network. After the blast furnace obtains air again, the interior of the pipeline is always in positive pressure without the entry of air, the explosion-proof tests for blast-furnace gas consumption users are qualified within short time, and users can be guaranteed to fast resume production.

The invention relates to a novel electrical contact jack, which comprises a jack main body, a welding zone and a jack zone, wherein the jack zone and the welding zone are respectively arranged on the front end and the rear end of the jack main body, a slotting zone is formed on the jack zone along the axial direction of the jack main body, an inner cavity of the jack zone is stepwise divided into a contact zone and a longhole zone from outside in, and the inner bore size of the longhole zone is larger than that of the contact zone. The jack zone of the jack is formed by stepwise combining the contact zone with the longhole zone, the contact zone is fully utilized to realize the large-area contact of a cylinder formed when a pin is plugged in the jack, and the longhole zone is utilized to realize the correction of the concentricity deviation when the pin is plugged in the jack; the jack has a simple structure, is beneficial for the pin to be stably plugged in, and has good plug-in performance; and the service lives of the pin and the jack are prolonged.

The invention discloses a supercritical carbon dioxide positive and negative pressure interaction combined gas extraction system. The system comprises a plurality of negative pressure holes evenly formed in a coal seam wall, and positive pressure holes are formed in areas defined by adjacent negative pressure holes. An extraction pipe is arranged in each negative pressure hole, extends out of a negative pressure hole sealing device and is connected with a negative pressure branch pipe, and the negative pressure branch pipes are connected with a negative pressure main pipe; a fracturing pipe and a carbon fiber quartz electric heating pipe are arranged in each positive pressure hole, each fracturing pipe extends out of a positive pressure hole packer, and the fracturing pipes are connected with a positive pressure main pipe; the positive pressure main pipe is connected with a gas storage tank, and a heating box, a booster pump and a pressure release valve are arranged on the positive pressure main pipe between the gas storage tank and the fracturing pipe in series. The invention further discloses a corresponding gas extraction method. The energy utilization rate is high, the supercritical state of carbon dioxide can be kept for a long time, and efficient gas extraction is achieved under the interaction of positive pressure and negative pressure.

The invention provides an auxiliary machine cooling water system achieving high-low position arrangement. The auxiliary machine cooling water system comprises multiple auxiliary machine devices sequentially arranged on the ground upwards. The multiple auxiliary machine devices are divided into the high-position arrangement auxiliary machine devices and the low-position arrangement auxiliary machine devices by a division face. An auxiliary machine dry cooling system is adopted by each of the high-position arrangement auxiliary machine devices and the low-position arrangement auxiliary machine devices. The auxiliary machine dry cooling systems comprise high-position water tanks, auxiliary machine cooling water pumps and auxiliary machine dry cooling towers. The multiple corresponding auxiliary machine devices in the high-position arrangement auxiliary machine devices and the low-position arrangement auxiliary machine devices are connected in parallel. In the high-position arrangement auxiliary machine devices or the low-position arrangement auxiliary machine devices, outlets of the auxiliary machine devices are connected with inlets of the auxiliary machine cooling water pumps, outlets of the auxiliary machine cooling water pumps are connected with inlets of the auxiliary machine dry cooling towers, outlets of the high-position water tanks are connected with the outlets of the auxiliary machine cooling water pumps, and outlets of the auxiliary machine dry cooling towers are connected with inlets of the auxiliary machine devices. By means of the system, the manufacturing requirement and cost of the devices are greatly reduced, and meanwhile the safety of device operation is improved.

The invention discloses a moistureproof distribution box with a fire power-off function, which comprises a box body assembly, a flow guide device, a separation device and a pressure regulating device, and is characterized in that the box body assembly is connected with the flow guide device, the flow guide device is communicated with the separation device, the pressure regulating device is movably connected with the box body assembly, the box body assembly is communicated with the separation device, and the box body assembly comprises a box body; a working cavity is formed in the box body, a wire inlet hole is formed in the working cavity, a wire inlet sliding groove is formed in the box body, magnetic suction cups are symmetrically arranged in the wire inlet hole, the two sides of the wire inlet sliding groove are communicated with the wire inlet hole and the working cavity respectively, the magnetic suction cup close to one side of the wire inlet hole is connected with a transmission inlet wire, and the magnetic suction cup close to one side of the wire inlet hole is connected with the wire inlet sliding groove in a sliding mode. A heat insulation layer is arranged along the inner wall of the working cavity, an air inlet channel is formed in one side of the lower end of the box body, and the flow guiding device is located at an inlet of the air inlet channel.

The invention discloses a gas-holder-free single blast furnace produced gas pipe network. The above blast furnace is an iron making blast furnace; and the gas pipe network is connected with a gas use unit, and is also connected with a low-pressure nitrogen pipe network through a nitrogen pipeline. By adopting the above technical scheme, a burner valve can be turned off under the decompression of the pipe network of each of gas users, so the positive pressure of the pipe network is guaranteed, a back draft accident is prevented, and the safety and the stability of the running of the pipe network are guaranteed; and after the blast furnace reblowing, the pressure in the pipeline is always positive, no air enters, and the explosion-proof test of blast furnace gas users within a short time is qualified, so the rapid production recovery of the users is guaranteed.