56results about How to "Meet the pressure" patented technology

The invention discloses a combination bearing type large-specification movable elbow mechanism. The combination bearing type large-specification movable elbow mechanism comprises elbows, connection heads, a pressing cover, a packing seal component and a rotating component, wherein positions between the elbows and the connection heads as wall as between the elbows are fixedly connected through thepressing cover and are sealed through the packing seal component, cavities are formed at the positions between pressing cover and the connection heads as wall as between the pressing cover and the elbows and are internally provided with the rotating component, the rotating component is used for relative rotating of the connection heads or the elbows and comprises a centripetal bearing and a thrustbearing, and the elbows and the connection heads as wall as the elbows are flexibly connected. The combination bearing type large-specification movable elbow mechanism has the beneficial effects thatthe combination bearing type large-specification movable elbow mechanism is flexible in connection, smooth in rotating, simple in structure, not limited by the pipe diameter, also not limited by theelbow structure molding method, small in volume and diversified in molding method.

The invention provides a high-temperature high-pressure clamp for testing rock core by nuclear magnetic resonance, which is applied to rock core dynamic experiments in a laboratory. The clamp mainly comprises an annulus pressure part, a high-temperature heating part, a displace part and a nuclear magnetic resonance part, wherein a sealing end cover and a lock nut are arranged at two ends of a cavity of the clamp; an annulus pressure oil inlet pipe and an annulus pressure oil drain pipe pass through the sealing end cover and are communicated with the cavity of the clamp; a spiral heat-conducting oil pipe is arranged between an insulating shell and the cavity of the clamp; two cylindrical rock core tops and sealing members are arranged in a fluorine rubber tube; a displacing oil inlet pipe and a displacing oil outlet pipe are fixed at two ends of the cylindrical sealing members; a nuclear magnetic resonance coil frame is arranged in the cavity of the clamp; and a nuclear magnetic resonance coil is arranged in an annular space formed between the outer wall of the nuclear magnetic resonance coil frame and the cavity of the clamp. The clamp has the advantages of simulating temperature and pressure of the rock core in the stratum to ensure that a nuclear magnetic resonance instrument can measure the physical parameters of the rock core under the condition of simulating the stratum.

The invention discloses a method for coordinating and controlling quality change of coal in a supercritical once-through boiler unit. The method is used for building a boiler master control provided with balanced indirect energy, and comprises the following steps: quantifying coal quantity by load; quantifying primary air quantity by the coal quantity; confirming a dominant role of instructions of the boiler master control; jointly debugging the ratios of wind, water and coal to ensure that the superheat degree of the boiler meets the requirement; meanwhile, ensuring the control precision of the front pressure of the boiler unit to meet the requirements of a power grid for changing range and speed rate. The method mainly solves the problem that the unit runs fast while the boiler efficiency is low, and builds a novel static feedforward, a load dynamic feedfoward, a pressure dynamic feedforward, and dynamic corrections of the feedforwards based on quality change of coal; the linkage of wind, water and coal quickens the responsiveness of the boiler; the joint debugging of water and coal solves the problem of quality change of coal, realizes the decoupling of water and coal and the decoupling of main steam pressure and superheat degree; the linear real-time coefficient modifies various experience curves; and a main steam pressure regulator of the boiler master control is subjected to the variable parameter control.

The invention discloses a high-pressure bidirectional miniature power-driven air pump which comprises a motor, an eccentric shaft, an oscillating bar, a pump body, a left cylinder body, a right cylinder body, a piston rod, and a one-way valve body and a cylinder cover connected with the two cylinder bodies, wherein the motor is fixed on the pump body, a motor shaft is connected with the eccentricshaft, a driving pin at one end of the eccentric shaft penetrates through one installation hole of the oscillating rod, the oscillating rod is connected on the piston rod arranged horizontally by a screw, sealing rings are arranged on two ends of the piston rod and stretch into the left and the right cylinder bodies respectively, and the two cylinder bodies are respectively arranged at two ends of the pump body. The power-driven air pump has the advantages of small volume, light weight, low power consumption, capacity of generating high pressure, wide pressure range, good starting performancewith pressure, and the like, and can satisfy the requirements of the industry on small flow and high pressure.

The invention relates to a multi-angle nozzle for a cleaner, which comprises a nozzle holder. Water inlets, flow passages, and water outlets are formed on the nozzle holder; the water inlet is connected with a spraying rod; the flow passage is connected with a water inlet and a water outlet; a nozzle cage is arranged outside the nozzle holder; nozzle cores are internally installed in the nozzle cage; water spraying holes are formed on the nozzle core; and the water spraying holes are communicated with the water outlets. The nozzle is characterized in that the nozzle holder is in clearance fit with the nozzle cage; a positioning device is arranged between the nozzle holder and the nozzle cage; two or more nozzle cores are arranged in the nozzle cage and uniformly distributed according to the circumference, wherein, the sparing hole of one of the spray cores corresponds with the water outlet, injection angles of all spraying holes are different, and the injection diffusion angle is between 0 degree to 90 degrees. The nozzle has the advantages that an injection angle can be arbitrarily chosen according to requirements, so that the requirements of different pressures and cleaning areas can be met, and the application range is wide.

The invention belongs to the technical field of sewage disposal technology and particularly relates to a concentrated and integrated sand and water separation device. The concentrated and integrated sand and water separation device aims at separating sand and water in sand and water mixed liquid discharged from a grit chamber of a sewage disposal plant, reinforcing removal of fine sand and reducing organic content on sand surfaces to further release a carbon resource. According to the technical scheme, the concentrated and integrated sand and water separation device comprises a sand concentrator and a sand and water separator; the sand and water separator comprises a collection hopper water tank and a spiral sand washing device; the sand concentrator is connected to the collection hopper water tank. The concentrated and integrated sand and water separation device is used for separating the sand and the water in the sewage disposal plant, reinforcing the removal of the sand, reducing the organic content on the sand surfaces and promoting organic entrapment.

The invention provides a great-depth seabed portable electric cutting device which can be loaded onto a 7000-meter manned submersible and conducts cutting and sampling on underwater ore. The device comprises a direct current motor and a reducer, the direct current motor and the reducer are fixed to an output shaft through a coupling and a bearing, and an oil charge cavity is formed in a shell body of a shell. The static sealing design is adopted between a front end cap of the shell and the shell, and one or more O-shaped rubber rings are arranged at the contact part between the front end cap and the shell; a rotating combination sealing ring is arranged at the contact part between a revolving shaft and the front end cap, the double-acting rotating seal is adopted for the rotating combination sealing ring, and the sealing pressure can reach 30 MP; the same static sealing design is adopted at a rear end cap of the shell, and one or more O-shaped rubber rings are arranged at the contact part between the rear end cap and the shell. By means of the device, the problems that existing great-depth underwater rock sampling mechanisms are difficult to sample or load, complex in structure, high in fabrication cost, hard to maintain and the like are solved, and the device has the advantages of being simple in fabrication, high in efficiency, safe and reliable.

The invention discloses a grouting pump for a high-pressure constant-flow test.The grouting pump comprises a high-pressure slurry storage tank, a propelling, pressurizing and flow stabilizing system, a built-in stirring system, a slurry input/output system, a monitoring system and a base.The propelling, pressurizing and flow stabilizing system extends into the high-pressure slurry storage tank.The built-in stirring system is located in the high-pressure slurry storage tank so that uniform stirring of output slurry can be achieved.One end of the built-in stirring system makes contact with the propelling, pressurizing and flow stabilizing system in the high-pressure slurry storage tank.The slurry input/output system is communicated with the high-pressure slurry storage tank.The monitoring system is arranged on the slurry input/output system.The high-pressure slurry storage tank and the propelling, pressurizing and flow stabilizing system are arranged on the base.The propelling, pressurizing and flow stabilizing system uses a stepping motor as the power source, the consistency of slurry output flow can be met, the grouting speed is adjusted by adjusting the rotating speed of the stepping motor, and dual-liquid grouting tests of different ratios can be guaranteed when multiple instruments are used at the same time.The requirements for high grouting pressure and constant grouting speed in grouting tests are met.

The invention relates to an oil tank for an unmanned aerial vehicle. An oil filling port is located in the upper-left portion of the oil tank. Air ports are located in the top of the oil tank and communicate with three-way adaptors and the atmosphere through air pipes. Oil delivery ports are located in the bottom of the oil tank and communicate with other oil tanks through oil delivery pipes. Oil supply ports are located in the bottom of the oil tank, and fuel oil is supplied to an engine through a fuel oil filter and a fuel oil pump. An oil return port is located in the upper-rear portion of the oil tank and used for recovering residual fuel oil of the engine. An oil quantity measurement port is located in the middle-upper portion of the oil tank. An oil discharging port is located in the middle-lower portion of the oil tank, and an oil discharging switch is mounted at the oil discharging port. Lifting lugs are located around the oil tank. According to the oil tank for the unmanned aerial vehicle, the weight reduction effect is remarkable, so that the unmanned aerial vehicle has a greater effective load under the same engine power condition, and it is of great importance for the usability of the unmanned aerial vehicle; and a combat unmanned aerial vehicle can carry more weapons or fuel oil, an agricultural unmanned aerial vehicle can carry more pesticides or seeds, and an aerial photographing and mapping unmanned aerial vehicle can carry more fuel oil.

The invention aims at solving the problems that seed propagation adopted in current polygonatum sibiricum red production is difficult, plant diseases and insect pests can easily become more serious and germplasm can be easily degenerated during the conventional rhizome propagation, tissue culture mainly takes terminal buds of rhizome and stem tips as explants for establishing a rapid propagation system, source of the explant is single, test material consumption is high and propagation efficiency is low. According to the method provided by the invention, easily available polygonatum kingianum terminal bud scales are selected as an explant test material, adventitious roots are obtained by inducing bud scale differentiation, and then further induction is carried out on the adventitious roots, so that differentiation bodies of different types such as rhizomes having adventitious roots and terminal buds at the same time, adventitious bud clumps and callus tissues in multiple forms are obtained; and respectively continuously culturing the differentiation bodies of different types, so that new adventitious bud clumps, rhizomes with terminal buds and callus tissues of multiple types can be respectively continuously produced, and an in vitro high-frequency regeneration system for roots, stems and leaves of polygonatum sibiricum red is established; a high-frequency regeneration system for the roots and stems can also be obtained by adopting the same culture medium. The roots, stems, leaves, callus tissues and rhizomes obtained by utilizing the method can be mutually transformed and grow in different culture stages.

The invention discloses engineering machinery and an engine starting ignition system thereof. The engine starting ignition system comprises a lower car engine, a first oil pump, a first reversing valve, an upper car engine and a second oil pump. The first oil pump is connected with the lower car engine in a driving mode, and the second oil pump is connected with the upper car engine in a driving mode. A first oil port of the first oil pump is connected with an oil tank, and a second oil port of the first oil pump is connected with the first oil port of the second oil pump through the first reversing valve. Compared with the prior art, the engine starting ignition system can avoid the fact that the upper car engine cannot be started when a storage battery is low in power or a starting motor loses efficacy (for example, under low temperature environment). In addition, due to the fact that the lower car engine can be fully utilized and a part of original hydraulic elements can be utilized (for example, a working oil pump of an original hydraulic system of a lower car can serve as the first oil pump), the resource utilization rate is improved.

The invention discloses a high and low-pressure mode switching method and a plunger type high-pressure water pump system of a plunger type high-pressure water pump. The switching method comprises the following steps of: 1) prestoring the high-pressure mode and low-pressure mode switching critical pressure values; 2) obtaining the current load pressure value; and 3) judging the relationship between the current load pressure value and the critical pressure value and judging the current working mode; returning to the step 2) when the load pressure value is greater than the critical pressure value in the high-pressure mode, or when the current load pressure value is smaller than the critical pressure value in the low-pressure mode; going to step 31) when the load pressure value is smaller than the critical pressure value in the high-pressure mode, i.e. switching to the low-pressure mode; and going to step 32) when the load pressure value is greater than the critical pressure value in the low-pressure mode, i.e. switching to the high-pressure mode. The high-pressure mode and the low-pressure mode can be automatically switched according to the load pressure, so that the requirement of pressure and flow rate is met, and the optimization matching of the high and low-pressure modes is realized.

The invention discloses a secondary side water supplementing device for a closed heat exchange system. The water supplementing device comprises a heat exchanger, a primary net water supply pipe, a primary net water returning pipe, a secondary net water supply pipe, a secondary net water returning pipe and a water tank, wherein the primary net water supply pipe, the primary net water returning pipe, the secondary net water supply pipe and the secondary net water returning pipe are communicated with the heat exchanger; the primary net water returning pipe is also communicated with a pre-heat exchanger; the secondary net water returning pipe is also communicated with the pre-heat exchanger through a pre-heating pump; a part of primary net returning water which is preprocessed by the pre-heat exchanger flows into the water tank; and the water tank is used for connecting a part of the primary net returning water which meets requirements with the secondary net water supply pipe through a water supplementing pipe. A secondary net is supplemented with softened water in a primary net, the device not only meets a basic water supplementing function, but also is simple in internal structure, equipment is more compact, the occupied area and the use space of a heat exchange station are reduced, the initial cost and the operation expense are saved, and repeated arrangement of the equipment is reduced; and at the same time, the workloads for maintaining the equipment, preparing softened water and testing water quality are reduced, labor power is saved, the construction, the installation and the post maintenance are very convenient.

The invention belongs to a valve, in particular to a flow separation, pressure adjustment and speed adjustment reversing integrated valve. The integrated valve comprises a valve body, an oil inlet andoverflow valve arranged on the valve body, and a pilot pressure adjusting, throttling switching and speed adjusting unit; the valve body is provided with an oil return port, a throttling oil outlet and an oil outlet; an overflow back pressure cavity, an oil outlet cavity, an oil inlet cavity, a throttling oil outlet cavity and a liquid control cavity, axially penetrating through a main hole, arearranged in the valve body at intervals; the throttling oil outlet cavity communicates with the throttling oil outlet; the oil outlet cavity communicates with the oil outlet; the oil outlet cavity communicates with the liquid control cavity by a liquid control hole way; an overflow main valve sleeve is inserted in the main hole to form dynamic seal fit, the outer end thereof is assembled with an outer end stop port of the main hole, and the inner end thereof is provided with a throttling port; and in a non-working state, the overflow main valve sleeve separates the oil inlet cavity from the oil outlet cavity. The integrated valve effectively solves the technical difficulties of high energy consumption, high working medium temperature rise and the like in the prior art, and has the advantages of capability of respectively driving multiple execution elements with different working pressures and flows, lower grade requirement on system modules, capability of realizing speed adjustment andthe like.

The invention relates to the air tightness checking field, particularly to an air tightness checking device and method by liquid nitrogen pressurization and gasification. The device comprises a liquid nitrogen tank (1), a liquid nitrogen pressurization pump (2) and a motor, and a gasification device (4); and a nitrogen pipe is laid. Liquid nitrogen is conveyed to the inlet of the pressurization pump by a pipe; and nitrogen is returned to the liquid nitrogen tank (1) by a pipeline. Liquid nitrogen is pressurized by the pressurization pump (2) to form high-pressure liquid nitrogen that is conveyed to the gasification device (4); and the high-pressure liquid nitrogen is gasified into a high-pressure N2 at an environment temperature and then the N2 is conveyed to a high-pressure N2 pipe network for distribution to all service stations. Compared with the prior art, the equipment and method have advantages of simple flow, high security, wide application range, sufficient gas source, and low cost and can be applied to various air tightness testing and checking.

The invention relates to a medical pillow which comprises a pillow inner and a pillowcase wrapped outside the pillow inner. The innovation point is that the pillow inner is filled with the components in parts by weight as follows: 15-20 parts of pericarpium citri reticulatae viride, 16-21 parts of hawthorn, 17-21 parts of medicated leaven, 14-26 parts of malt, 11-15 parts of amomum tsao-ko, 15-23 parts of semen brassicae and 19-23 parts of perillaseed. The pericarpium citri reticulatae viride, the hawthorn, the medicated leaven, the malt, the amomum tsao-ko, the semen brassicae and the perillaseed are filled in the pillow inner in proportion. The pericarpium citri reticulatae viride soothes the liver and relieves stagnant Qi, removes stasis and dissolves phlegm. The medicated leaven eliminates phlegm and relieves mass, treats stagnation of liver qi and hypochondriac pain and rage and chronic malaria as well as cleanliness addiction. The components exert the efficacy slowly in long time sleep of people and exert the functions respectively. The medical pillow is good in health care effect, relieves stomachache and refrigerates and meets the living demand of modern people under heavy pressure and at high pace.

The invention discloses a hard alloy product, a preparation method thereof and a device for preparing the hard alloy product, and belongs to the field of powder metallurgy. The preparation method of the hard alloy product includes the steps that hard alloy powder and an adhesion agent are mixed and feedstock is prepared; the feedstock is stored in an extruding machine so that the feedstock can be extruded out from a nozzle of a numerical control machine tool which is connected with the extruding machine; and the numerical control machine tool controls the extruded feedstock to be layered-deposited, and the hard alloy product is prepared. The device for preparing the hard alloy product comprises the extruding machine and the numerical control machine tool; the numerical control machine tool comprises a heatable nozzle, the nozzle is the executive component of the numerical control machine tool, and connected with a driving component of the numerical control machine tool; and a material outlet of the extruding machine is connected with the nozzle through a material pipe. According to the hard alloy product, the preparation method thereof and the device for preparing the hard alloy product, a die does not need to be manufactured, complex shapes can be formed, the density of each part of the product is even, deformation is small, and the comprehensive property is high.

The invention discloses a compression stocking meeting the requirements of human body pressure and pressure distribution law and a knitting method thereof. According to the method, adjusting coils arearranged at intervals between normal coils of the compression stocking, and the normal coils and the adjusting coils cooperate to form an organ structure. When the stocking body surface is not stretched or shrunk, the adjusting coils are extruded by the normal coils and suspended on the surface of the compression stocking, and an upper and a lower normal coils are closely cooperated, when the stocking body surface is stretched, the normal coils are stretched to form gaps, and the gaps are filled with the adjusting coils. The compression stocking meeting the requirements of human body pressureand pressure distribution law and the knitting method thereof have the advantages that when the size of the stocking body surface is changed for adapting to changes in the bones, muscles and the likein daily activities of a human body, the compression stocking automatically adjusts the size of the stocking body to meet the changing needs of the human body surface during exercise, and thereby eliminating or reducing the problem of unreasonable pressure and pressure distribution caused by changes in the bones, muscles and the like under different active conditions of the human body.

The invention relates to a process for producing an underwear fabric. The process for producing the underwear fabric mainly includes weaving, dyeing and post-processing. The process for producing the underwear fabric is characterized in that firstly wool yarns and silks are mixed and woven; 700-820 parts by weight of water, 100-150 parts by weight of ginseng flowers, 100-150 parts by weight of chrysanthemum morifolium ramat and 100-150 parts by weight of fructus lycii are added into a pressure container to obtain a mixture, the mixture is heated to 45-66 DEG C, and the thermal insulation is performed for 89-108 minutes; and then the mixture enters a dyeing machine to be dyed, and finally a post-processing is performed. The process for producing the underwear fabric has the advantages that chinese herbal medicines of the ginseng flowers, the chrysanthemum morifolium ramat, the fructus lycii and the like are added into the fabric, after the fabric is manufactured into an underwear, the underwear can be directly contacted with the skin of a user when the user wears the underwear, crude drugs can be slowly released to the skin, an underwear for men has effects of nourishing yin and tonifying kidney, and strengthening vitality, an underwear for women has advantages of maintaining and nursing qi and blood, moisturizing skin and blackening hair, and preventing pimples and whelks, the healthcare effect is good, and requirements of high pressure high rhythm lives of contemporary young people are met.

The invention discloses a visual dynamic fracture self-supporting fracturing technology research experimental device. The visual dynamic fracture self-supporting fracturing technology research experimental device includes the following units of (1) a visual variable fracture width simulation plate and hydraulic control and measurement unit, (2) a visual clamping temperature control unit, (3) a visual simulation fluid injection pipeline, wellbore and fracturing blender truck simulation unit, (4) a fluid supply unit, (5) a pressure control and flow control unit, (6) a self-supporting fracturingfluid and channel fracturing fluid separator and (7) an image acquisition unit; and the units are combined to form a flow space which has a fluid pressure resistance of 10 MPa and can simulate a flowdistribution law of a self-supporting fracturing fluid system in a perforation belt and a parallel fracture space, and meanwhile, the flow space is further provided with a heating and temperature control system and can provide simulated formation heating conditions, so that self-supporting fracturing fluid with different distribution produces phase transition to form a self-supporting solid phase.

The invention relates to the field of explosion-proof gas-permeable valves for batteries, and discloses an explosion-proof gas-permeable membrane module and a battery pack explosion-proof gas-permeable valve thereof. The explosion-proof gas-permeable membrane module comprises an explosion-proof gas-permeable membrane support (200), a composite membrane arranged on the explosion-proof gas-permeablemembrane support (200), a gas-permeable membrane support (100), and a first gas-permeable membrane (110) arranged on the gas-permeable membrane support (100). The shapes of the explosion-proof gas-permeable membrane support (200) and the gas-permeable membrane support (100) are correspondingly arranged, so that the explosion-proof gas-permeable membrane support (200) is fitted into the gas-permeable membrane support (100). The composite membrane and the first gas-permeable membrane (110) are stacked. According to the invention, the double-layer gas-permeable membrane structure combining the composite membrane and the gas-permeable membrane improves the safety and reliability of an explosion-proof gas-permeable valve.

The invention relates to a process for producing male health underwear fabrics, which substantially comprises the steps of weaving, dyeing and post-processing, and is characterized in that wool yarns and natural silks are mixed and weaved firstly, water, herba epimedii, teasel roots, dodder, polygonum multiflorum, wolfberry fruits, mrlberrt fruits, raspberry, schisandra chinensis, plantain seeds and astragalus mongholicus are added in a pressure container by weight, enter a dyeing machine to be dyed after being heated to 30-36 DEG C and insulated for 120-130 minutes, and are post-processed at last. Chinese herbal medicine such as the herba epimedii and the teasel roots and the like are added in fabrics, and the fabrics are directly contacted with skins of human bodies during the wear process after being made into underwear to slowly release the Chinese herbal medicine to the skins, thereby being capable of preventing male symptoms of physical pain, sexual indifference and frequent micturition and the like, being excellent in health effect, and meeting the demands of high pressure and high rhythm life of contemporary male crowds.

The invention discloses a construction waste recycling device, and relates to the field of construction equipment. The technical scheme includes the steps that construction muck and a first auxiliarymaterial as main materials are crushed into granular materials; the first auxiliary material is a viscous material which is solid at room temperature and liquid after being heated; the crushed materials are fully stirred and mixed and heated; the mixed materials are poured into frame type brick molds; the brick molds filled with the materials are compacted; after the brick molds are cooled, central hollowed-out upper covers are buckled on the molds; and the hollowed-out parts of the upper covers are used for smearing the material for capping. The construction waste recycling device has the beneficial effects that according to the scheme, the construction muck and plastic fertilizer are recycled to form the bricks for pavement laying, the whole process is relatively simple, the brick forming can be realized basically by filling, and the bearing pressure of pavement laying can be met.

The invention discloses a method for preparing scented tea by using pigments extracted from natural crops and belongs to the technical field of drink formulae or preparation methods, in particular to a method for preparing scented tea. The method comprises: extracting pigments from edible flowers, fruits and natural purple sweet potatoes; and combining the pigments to form a formula and making drinks. With rich pigment extracted from the purple sweet potatoes, the color of the drinks changes from rose red to pink to light pink and purple and the like with the increase of the brewing times. The unique scented tea color is derived from the pigment of the purple sweet potatoes, and this is the core value. Pure purple sweet potato pigment has the functions of resisting cancer and oxidization,improving the elasticity of blood vessels, improving micro circulation, improving skin smoothness, inhibiting inflammation and allergy, improving joint flexibility and the like.

The invention provides a novel water-saving system of an energy-saving heat exchanger, which is characterized by comprising a variable sound velocity auto-boosting heat exchanger and a water treatment system; hot water subjected to heat exchange by the variable sound velocity auto-boosting heat exchanger is changed into cooled circulating water after passing through a heating system; and the circulating water is purified through the water treatment system to be changed into purified water and then enters the variable sound velocity auto-boosting heat exchanger again to be recycled. By using the novel water-saving system of the energy-saving heat exchanger, energy can be saved; furthermore, water can also be saved.

The invention relates to an airplane electric transmission braking system for improving the braking capacity in a take-off line and a control method. A control box respectively receives a braking command voltage signal sent by a braking command sensor and an airplane wheel speed voltage signal provided by an airplane wheel speed sensor; the control box sends a braking anti-skid control current signal to an electro-hydraulic servo valve. The electro-hydraulic servo valve is arranged on a hydraulic pipeline in an airplane main undercarriage cabin. A hydraulic control valve is arranged on a hydraulic pipeline output by a braking port of the electro-hydraulic servo valve. When braking in the take-off line, when a hydraulic brake pressure output by the electro-hydraulic servo valve is greater than a preset value, the hydraulic control valve is started, an oil path is switched, and the high-pressure hydraulic pressure of a pressure supply source of a braking system is directly output to an airplane wheel braking device to carry out take-off line braking operation. According to the airplane electric transmission braking system for improving the braking capacity in the take-off line and the control method, the control box interferes and controls a braking control current of the electro-hydraulic servo valve to interfere and control the hydraulic control valve to switch the oil path, sothat dangerous consequences caused by misjudgment and misuse of the take-off line braking are avoided, the take-off line braking reliability is effectively improved, and safe and reliable use of theairplane is ensured.

The invention discloses an oil gas recovery unit capable of realizing PID controlled automatic adsorption pressure and desorption pressure adjusting, and an oil gas recovery method, and belongs to thetechnical field of oil gas recovery. In the prior art, full adsorption and desorption are impossible to realize using conventional oil gas recovery systems. According to the oil gas recovery unit capable of realizing PID controlled automatic adsorption pressure and desorption pressure adjusting, a proportioning valve is taken as an actuating mechanism to realize PID automatic adjusting; the proportioning valve is controlled by a PLC controller; the PLC controller is connected with a pressure sensor which is used for detecting the internal pressure of a carbon tank; PID automatic adjusting ofthe opening degree of the proportioning valve is adopted by the PLC controller based on the pressure detected by the pressure sensor, so that pressure needed by the carbon tank is provided, and pressure fluctuating value ranges from -2KPa to 2KPa; a preset pressure can be achieved and maintained to be constant based on technology requirements, oil gas full desorption recovery is realized, and theindexes of gas discharged after adsorption are much lower than those disclosed in national standards.

The invention discloses a self-adaptive pressure relieving multifunctional bed for old people. A mattress is a loofah sponge fiber and latex composite mattress, and is concretely placed onto an automatic regulating bed frame; pressure sensors used for sensing the stress condition of each position are arranged in the mattress; a pressure regulating device is arranged on the bed frame under the mattress; the pressure sensors and the pressure regulating device are respectively connected with a host processor through an information collector; the host processor is connected with a mobile phone ina wireless way; and when the host processor detects that the pressure of a certain position of the mattress is abnormal through the pressure sensor, the host processor drives the pressure regulating device to regulate the pressure of the corresponding position. The self-adaptive pressure relieving multifunctional bed for old people has the advantages that through the design on the mattress and thebed frame of a nursing bed for old people, the nursing requirements such as physiological activity assisting, self-adaptive pressure relieving and pressure monitoring of old people can be met in multiple aspects; and device-aided old people are helped to realize normal life and health sleeping.

The invention discloses a nitrogen pressure stabilizing system for a high-temperature high-pressure hot water system. The system comprises a liquid nitrogen gas making device, a nitrogen mother pipe and pressure stabilizers, wherein the gas outlet end of the liquid nitrogen gas making device communicates with the nitrogen mother pipe; the nitrogen mother pipe communicates with a plurality of nitrogen supplementing branches; each nitrogen supplementing branch is provided with one pressure stabilizer, and the outlet of each nitrogen supplementing branch communicates with gas space on the upper portion in the corresponding pressure stabilizer; the liquid part at the lower part of each pressure stabilizer communicates with the high-temperature high-pressure hot water loop system through a fluctuation pipe; and the gas part of each pressure stabilizer communicates with a discharge pipeline. The system has the beneficial effects that: according to the pressure stabilizing system, liquid nitrogen gasification is adopted as a pressure stabilizing gas source, so that more gas is stored per unit volume, frequent replacement of gas cylinders is avoided, the nitrogen production cost is reduced, the nitrogen supply is guaranteed, the control is simple, the response is fast, the pressure fluctuation and control requirements in the operation process of each operation working condition of thehot water loop system can be fully met, and the scaling and corrosion risks caused by gas dissolving in water are reduced.