1025 results about "Ultra high pressure" patented technology

The invention provides a low-speed and ultrahigh-pressure die-casting process method for automobile part die-casting, and relates to the field of automobile part manufacturing. The method includes the following steps that firstly, a mold is prepared, secondly, molten metal is prepared, thirdly, a casting is cooled and demolded, and fifthly, follow-up treatment is conducted. The defects that in the high-speed mold filling process of a common high-pressure casting technology, gas is likely to be involved in the molten metal, and consequently air holes, shrinkage porosity and the like are generated in the casting are overcome; and when key parts such as automobile engine cylinder bodies and hubs are produced, air hole defects possibly cause the problems of air leakage of engines, insufficient hub strength and the like. And meanwhile, for parts with thin walls and complex structures, uniform filling of molten metal in a mold is difficult to ensure by a traditional die-casting process, the defects of cold shut, insufficient pouring and the like are easy to occur, and the qualified rate and the production efficiency of products are reduced.

The invention discloses a water quality stabilizer suitable for in-furnace treatment of medium-pressure, high-pressure and ultrahigh-pressure boilers and a preparation method of the water quality stabilizer. The water quality stabilizer comprises polyamine organic amines, an organic deoxidant, high-molecular polymeric salt, a silt adjusting agent and pure water. According to the water quality stabilizer disclosed by the invention, one medicament can replace three medicaments of ammonia water, hydrazine and trisodium phosphate added in a traditional boiler, the water quality stabilizer has multiple functions of film forming, corrosion inhibition, deoxygenization, passivation, scale inhibition, scale dissolution, dispersion, chelation, water quality stabilization and the like, meanwhile, the discharge capacity of the boiler can be greatly reduced, the heat energy loss and the water waste can be reduced, and the heat energy utilization rate can be improved. The preparation method disclosed by the invention has the advantages of good batch production effect, stable product performance and long shelf life.

The invention relates to the technical field of valve leakage detection, and particularly discloses an ultrahigh pressure gas valve leakage detection method and system. According to the method, a unified leakage feature vector is obtained through multi-source acquisition and processing; capturing a time sequence dependency relationship, and determining a micro leakage mode; carrying out abnormal peak detection to obtain a preliminary leakage probability; combining the initial leakage probability with real-time environmental parameters, and dynamically adjusting a judgment standard; comparing the unified leakage feature vectors through a judgment standard, fusing position coordinate triangulation positioning, judging whether micro crack leakage occurs or not, and obtaining leakage position estimation; the historical data sequence is fused, the micro crack development trend is predicted, and the early warning level is determined; and generating a corresponding response signal according to the early warning level, and outputting micro crack leakage early warning. Multi-source data fusion, dynamic threshold adjustment and position prediction can be carried out, the accuracy and robustness of micro crack leakage detection are remarkably improved, and efficient guarantee is provided for safe operation of a pipeline.

Low-pressure oil enters an inlet of a proportional overflow valve, the pressure of a low-pressure system is controlled by the proportional overflow valve, pressure oil on the low-pressure side acts on a plunger control cavity of the hydraulic control overflow valve through a pressure stabilizing damper and a one-way valve, and hydraulic pushing force generated by a plunger is transmitted to an overflow valve steel ball through a disc spring; when the force obtained by multiplying the ultrahigh pressure of the inlet of the hydraulic control overflow valve by the action area of the steel ball is equal to the pushing force of the plunger, the steel ball of the overflow valve is opened to start overflowing, and the overflow pressure of the ultrahigh pressure system can be controlled by adjusting the pressure of the proportional overflow valve of the low-pressure system. The external control type ultrahigh-pressure proportional pressure regulating valve can be used for pressure regulation of a hydraulic system with the pressure being 200 MPa or above and can be used as a proportional overflow valve of an ultrahigh-pressure hydraulic system. By arranging a hydraulic loop of two auxiliary oil ports of the external control type ultrahigh pressure proportional pressure regulating valve, the pressure rising one-way proportional regulating function, the pressure unloading function and the pressure rising / falling two-way proportional regulating function of an ultrahigh pressure system can be achieved.

The invention relates to the technical field of compressors, and discloses a gas piston assembly for an ultrahigh-pressure liquid-driven piston compressor, which comprises a gas piston main body, a sealing piece and a connecting piece, the air piston body comprises a first body part and a second body part which are oppositely arranged, a cylindrical protruding part is arranged in the center of the end face of one side of the first body part, and a positioning inserting hole matched with the cylindrical protruding part is formed in the center of the end face of the side, right opposite to the first body part, of the second body part. The sealing piece comprises a plurality of first piston rings and a plurality of second piston rings, the first piston rings and the second piston rings are arranged on the cylindrical protruding part in a sleeving mode and are alternately arranged, and the first piston rings are arranged close to the end face of the first main body part; the connecting piece is used for connecting the first main body part and the second main body part together after the cylindrical lug boss is inserted into the positioning insertion hole; the combined piston ring is used for replacing a traditional spring plug structure for sealing, and the sealing problem caused by extremely high pressure and temperature under the ultrahigh pressure working condition can be solved.

The utility model relates to a spatial multilayer ultrahigh pressure belt type dehydration system which comprises a main rack, a material distributing and feeding device, a material distributing device, a filter belt, a filter belt traction machine, a filter pressing hydraulic machine, a hydraulic station and a controller, the material distributing and feeding device, the material distributing device, the filter belt traction machine and the filter pressing hydraulic machine are connected and mounted on the main rack; and the output end of the material distributing and feeding device is connected and mounted above the material distributing device. The dehydration method comprises the steps of equipment starting, material distribution, filter pressing dehydration and unloading. The organic waste dehydration device is higher in dehydration efficiency and lower in cost, and can be used as an organic waste dehydration device capable of reducing pollution and carbon.

The invention discloses a leakage rate prediction method for a sealing interface of a metal lens gasket of ultrahigh pressure equipment, and belongs to the technical field of leakage rate prediction. The method comprises the following steps: S1, establishing a coupling damage cycle elastic-plastic constitutive model of a metal lens pad material; s2, establishing an ultrahigh-pressure sealing structure finite element model, applying a cyclic load for simulation, and fitting to obtain an attenuation rule model of the contact stress of the metal lens gasket under the cyclic load; s3, establishing a single rough peak contact deformation finite element model, correlating the model with an actual sealing structure, and fitting to obtain a relational expression between the contact stress of the metal lens pad and the microcosmic rough peak deformation under the cyclic load; s4, establishing a leakage model of the microcosmic pore structure of the sealing interface, and combining the steps S2 and S3 to obtain a leakage rate prediction model of the sealing interface; and S5, predicting the leakage rate by using the prediction model. According to the prediction method, the leakage rate of the sealing interface of the metal lens gasket under the cyclic load working condition can be accurately predicted.

The invention provides an ultrahigh-pressure vertical plunger pump. The ultrahigh-pressure vertical plunger pump comprises a plunger pump base, a plunger pump body and a plunger pump cover. A transmission structure is arranged on the inner side of the plunger pump base, a receding hole communicated with an inner cavity of the plunger pump base is formed in the upper end of the plunger pump base, and the output end of the transmission structure extends into the receding hole. A water inlet hole is formed in the side wall of the plunger pump body, a high-pressure cylinder is arranged on the inner side of the plunger pump body, a water passing hole is formed in the side wall of the upper end of the high-pressure cylinder, a sealing bush is arranged in the high-pressure cylinder, a plunger shaft is slidably arranged on the inner side of the sealing bush, and the lower end of the plunger shaft is connected with the power output end of the transmission structure. An annular lubricating gap is formed between the sealing bush and the plunger shaft; a drainage channel is arranged on the inner side of the plunger pump cover, and a one-way valve structure is arranged at the joint of a water inlet of the drainage channel and an inner cavity in the upper end of the high-pressure cylinder. Compared with a sealing ring, the sealing bush has higher strength and higher wear resistance, and is not easy to wear in the use process.

The invention discloses a multi-physics coupling viscosity calibration method for a large and heavy hydrostatic pressure rotating table, and belongs to the technical field of fluid mechanics modeling and high-end equipment manufacturing. According to the calibration method, a temperature control / high-pressure rotational rheometer is adopted to obtain experimental data, and experimental verification shows that the average prediction error of the model under the ultrahigh pressure (1000 MPa) and the wide temperature range (20-80 DEG C) is controlled within 10%, and the model is remarkably superior to traditional Arrhenius and Barus models (the error is 40% or above). Theoretical support is provided for oil film dynamic characteristics, bearing capacity optimization and real-time control of a large and heavy hydrostatic pressure system, and the method is suitable for various lubricating media such as mineral oil, synthetic oil and nanofluid and can be widely applied to precision machining and intelligent control in the field of high-end equipment manufacturing.

The invention provides multi-mode non-explosive excavation integrated equipment based on ultrahigh pressure hydraulic cutting, which comprises a mobile platform, the mobile platform comprises a lower layer frame body and an upper layer frame body, the lower part of the lower layer frame body is hollowed out and is provided with a movable tunneling crawler loader, the two ends of the lower layer frame body are provided with water jet cutter mechanical arms, and the upper layer frame body is provided with a wet spraying mechanical arm; arch anchor mechanical arms and auxiliary frame arch arms are arranged at the upper end and on the two sides of the movable platform, an arch frame sliding way is further arranged on the outer side of the movable platform, and the problem of efficient excavation of surrounding rock tunnels of various grades is solved.

The invention provides a fiber material reinforced ultrahigh-pressure direct-acting electromagnetic valve, which belongs to the technical field of electromagnetic valve design and comprises a valve body, a sealing pipe assembly, a winding body, a movable iron core assembly, a valve port sealing element, an electromagnetic coil and a magnetic conductive shell. Due to the adoption of the innovative structural design reinforced by the fiber material, the long-standing contradiction between the loading capacity and the magnetic circuit efficiency in the field of ultrahigh-pressure electromagnetic valves is skillfully solved, the overall mechanical property of the electromagnetic valve is optimized by the structure, and the magnetic circuit efficiency is guaranteed; meanwhile, the mechanical property of the movable part can be effectively enhanced due to the high-strength characteristic of the fiber material, so that the performance of the movable part is improved, the dynamic response hysteresis bottleneck is effectively overcome, and the response speed is increased; at the sealing part, the overall strength and stability of the sealing part can be enhanced through reinforcement of the fiber material, meanwhile, the sealing part can be prevented from losing efficacy due to medium corrosion through good corrosion resistance of the fiber material, the hidden danger of sealing instability in the high-pressure environment is thoroughly eliminated, and sealing reliability is guaranteed.

The invention discloses a heat treatment process of an alloy drill bit, which belongs to the field of alloy and comprises the following steps: S1, after the alloy drill bit is primarily machined and formed, carrying out vacuum pretreatment, heat preservation and heating; s2, the drill bit is rapidly transferred into a sectional temperature control carburizing furnace to be subjected to main carburizing treatment, the temperature is controlled between 930 DEG C and 960 DEG C, the carburizing time ranges from 3 hours to 4 hours, and the carburizing depth is controlled between 0.3 mm and 0.6 mm; s3, after carburizing is completed, subarea multi-speed cooling is carried out, quenching is carried out for 20 seconds at the temperature of 850 DEG C or above, controlled cooling is carried out for 60 seconds within the range of 550 DEG C to 650 DEG C, slow cooling is carried out for 80 seconds at the temperature of 200 DEG C or below, and a refined martensite complex phase structure is obtained; s4, after cooling is completed, double-section tempering treatment is carried out; and S5, performing ultrahigh-pressure static boriding diffusion treatment. The method has the beneficial effects that the processing uniformity, the structure stability, the wear resistance and the corrosion resistance of the alloy drill bit are effectively improved and the service life of the alloy drill bit is effectively prolonged by adopting staged temperature control, different cooling media and a directional quenching technology.

The invention relates to a method for preparing rubber powder by adopting a high-pressure water jet composite method. The method comprises the following preparation steps: S1, crushing rubber particles; s2, performing impact type filtration; s3, internal circulation of the rubber powder liquid; and S4, solid-phase separation and recovery. The cavitation effect and the high-speed impact effect in ultrahigh-pressure water jet can enable a rubber material to achieve the low-temperature crushing effect at the normal temperature, so that the purpose of preparing fine rubber powder can be achieved at the normal temperature in a low-energy-consumption, low-cost and environment-friendly manner; meanwhile, the actual filtering area of the filter cartridge is increased to the maximum extent, and the filtering effect and efficiency are improved to a great extent.

The invention provides a non-explosion excavation construction method based on ultrahigh pressure water jet cutting, which comprises a mobile platform, the mobile platform is provided with a water jet mechanical arm, a wet spraying mechanical arm, an arch anchor mechanical arm and an auxiliary frame arch arm, and the lower part of a lower layer frame body of the mobile platform is hollowed out and is provided with a movable tunneling slag-raking machine; the tunneling crawler loader is provided with a splitting drill mechanical arm or a breaking hammer mechanical arm; planning the arrangement position of a slag discharge hole, the movement track of a jet flow module, jet flow parameters and the arrangement of a splitting hole; the arch anchor mechanical arm moves forwards, and drilling operation of a slag discharging hole is conducted; the water jet cutter mechanical arm moves forwards and cuts the contour line with the slag discharging hole as the starting point; the tunneling slagging-off machine synchronously carries out excavation operation in the passing space, and gravels and muck are conveyed to the rear portion to be discharged; after the single-cycle operation is finished, the movable platform and the tunneling crawler loader move forwards, the wet spraying mechanical arm and the auxiliary frame arch arm carry out arch erecting, net hanging and primary spraying operation, and the non-blasting excavation problem under the sensitive geological conditions of superhard rock, high ground stress and the like is solved.

The invention belongs to the technical field of gas production wellhead devices, and particularly relates to an ultrahigh pressure gas production wellhead device without any rubber seal, which comprises a four-way pipe, a manual gate valve, a throttle valve, an instrument flange, an anti-shock pressure gauge, a hydraulic safety valve, a separation pressure reduction assembly, an upper flange, a casing head body and a casing hanger assembly, a sealing gasket ring I and a sealing gasket ring II are respectively arranged between the upper flange and the casing hanger assembly, and the casing hanger assembly is respectively connected with an inner cavity of the casing head body through an inner metal sealing ring I, an outer metal sealing ring I, an inner metal sealing ring II and an outer metal sealing ring II. Compared with rubber sealing, the metal sealing structure has higher stability. And the metal sealing element can bear high pressure and cannot generate permanent deformation or lose sealing capacity, so that the gas production device can be suitable for a worse gas production working condition, the frequency of shutdown maintenance caused by damage of the sealing element is reduced, and the continuity and efficiency of gas production operation are improved.

The invention relates to a high-precision and fast-response ultrahigh pressure adjusting method based on a real-time feedback control principle, and belongs to the technical field of ceramic manufacturing. The high-precision and fast-response ultrahigh pressure adjusting method based on the real-time feedback control principle comprises the steps that after a pressure adjusting device is started, a target pressure value is set; a high-precision pressure sensor is used for monitoring the pressure value in the forming process in real time; acquiring data of the pressure sensor in real time through a data acquisition system, and performing filtering and correction processing; the controller calculates the deviation between the current pressure and the set pressure according to the set pressure value and the pressure value collected in real time; by means of the real-time feedback control technology, high-precision adjustment of pressure is achieved, it is ensured that ceramic powder is subjected to uniform pressure in all directions, particles are tightly arranged, the forming density is improved, meanwhile, due to the fact that the pressure is applied in the same direction, the powder particles are subjected to the same compression force in all directions, and it is ensured that ceramic blanks are uniform in density and regular in shape.

According to the novel ultrahigh pressure proportional valve and the hydraulic control system, a piston cavity is formed in a valve body, a low-pressure piston block is arranged in the piston cavity, and a high-pressure cavity is formed in one side of the low-pressure piston block; the cavity body section of the high-pressure cavity is smaller than that of the piston cavity; a high-pressure piston block is arranged in the high-pressure cavity and is linked with the low-pressure piston block; the high-pressure cavity is connected with the high-pressure oil port, the piston cavity is connected with the low-pressure oil port, and one or more pressure relief oil ports are formed in the high-pressure cavity or the piston cavity. When the structure is used in a hydraulic control system, oil in the high-pressure cavity can be restrained to be discharged slowly through the low-pressure piston block, and the high-pressure cylinder can be controlled to stabilize pressure in a certain high-pressure state through proportional oil discharge. According to the hydraulic system, the defects in the prior art are overcome, stable control over the high-pressure oil cylinder can be achieved, during high-pressure unloading, the high pressure cannot be directly reduced to the lowest state, and linear unloading and pressure stabilization can be achieved.

The invention relates to the technical field of ultrahigh-pressure water cutting, and discloses an ultrahigh-pressure water cutting composite material winding sand mixing tank based on a lightweight structure, which comprises a metal cylinder body, and the metal cylinder body is the core part of the whole structure and is used for assembling and connecting other structural members; the two elliptical sealing heads are positioned at the upper end and the lower end of the metal cylinder and are used for sealing the whole structure; the reinforcing layer is positioned on the periphery of the metal cylinder and outside the two elliptical heads and is used for reinforcing the overall structural strength; and the protective layer is located outside the reinforcing layer and the two elliptical sealing heads and used for protecting the whole structure. According to the ultrahigh-pressure water cutting sand mixing tank, the transition section where the elliptical head is connected with the metal cylinder adopts a fillet transition form, stress concentration is reduced, the mechanical property is optimized, the overall safety and reliability of the ultrahigh-pressure water cutting sand mixing tank are improved, the metal cylinder made of high-strength alloy steel is selected, the impact resistance and fatigue resistance of the overall material are cooperatively improved, and the pressure bearing capacity is effectively improved.

The invention provides an ultrahigh-pressure hose connector assembling process and an ultrahigh-pressure hose connector assembly.The ultrahigh-pressure hose connector assembling process comprises the steps that a hose connector body is sleeved with a connector, so that after the connector and the hose connector body are sleeved in place, a moving channel used for installing a positioning component is formed between the connector and the hose connector body; the positioning part is installed in the formed moving channel; and glue is injected into a gap between the connector and the hose connector body, then vulcanization treatment is conducted, and the ultrahigh-pressure hose connector assembly is obtained. According to the ultrahigh-pressure hose connector assembling technology, the technical problem that the ultrahigh-pressure hose connector assembling technology in the related technology cannot meet the use requirement and the assembling requirement of large pressure fluctuation or high-frequency vibration in the use environment is solved.

The utility model discloses an organic waste composite dehydration system which comprises a physical dehydration device, a material crushing device and a biological dehydration device, and the material crushing device is connected and installed at the rear end of the physical dehydration device and the front end of the biological dehydration device. And the physical dehydration device comprises an ultrahigh-pressure laminated box type dehydration device or an ultrahigh-pressure laminated belt type dehydration device. The device can meet the requirements of environment-friendly treatment and resource utilization of organic wastes in real production, realizes integration of mechanical and physical dehydration and biological fermentation dehydration, and can be used for recycling the organic wastes without depending on other organic auxiliary materials or greatly reducing the dependence on the other organic auxiliary materials. According to the method, the organic waste with the moisture content of about 80% or even higher can be efficiently, directly and deeply dehydrated to the moisture content of 40% or lower at low cost, the index requirement of resource utilization is met, the treatment cost of the social organic waste is reduced, and the improvement of the social organic waste environment-friendly treatment and resource utilization level is facilitated.

The invention discloses an ultrahigh pressure liquid flow mill system which comprises a feeding pump used for providing slurry, a slurry booster pump used for boosting, a homogenizing device internally provided with an interaction containing cavity and a condenser used for reducing the temperature of the slurry, and the feeding pump, the slurry booster pump, the homogenizing device and the condenser are sequentially communicated. The slurry booster pump comprises a plunger pump and a plurality of high-pressure one-way valve sets, and each high-pressure one-way valve set is at least composed of a plurality of one-way valves which are sequentially connected in series in the slurry conveying direction. The feeding end of the feeding pump and the feeding port of the homogenizing equipment are communicated with an inner cavity of the plunger pump through a first high-pressure one-way valve bank and a second high-pressure one-way valve bank respectively, the first high-pressure one-way valve bank is installed in the forward direction, and the second high-pressure one-way valve bank is installed in the reverse direction. The invention provides an ultrahigh-pressure liquid flow mill system which can perform one-way flow control on fluid with particulate matters under the pressure environment of 100 MPA or above.

The invention relates to the technical field of in-situ environment reconstruction, and particularly provides a deep in-situ high-temperature and ultrahigh-pressure environment reconstruction system which comprises a shifting cabin, the shifting cabin comprises a pressure cavity and a temperature control cavity, the pressure cavity is coated with the temperature control cavity, and the temperature control cavity is communicated with the shifting cabin; a pressure sensor and a temperature sensor are arranged in the pressure cavity, the pressure cavity is filled with a liquid medium, and a heating structure is arranged in the temperature control cavity; the push rod is provided with a pressure piston in the pressure cavity; the control part is electrically connected with the heating structure, the push rod, the pressure sensor and the temperature sensor; according to the invention, the deep in-situ high-temperature and ultrahigh-pressure environment can be reconstructed, and an environmental basis is provided for researching the in-situ problem of deep rock mechanics.

The utility model relates to a cage basket conveying system which comprises a feeding roller seat connected with the feeding end of ultrahigh-pressure sterilization equipment and a discharging roller seat connected with the discharging end of the ultrahigh-pressure sterilization equipment, and a feeding cage pushing mechanism is installed above the feeding roller seat in a matched mode. The feeding cage pushing mechanism pushes a cage basket on the feeding roller seat into the ultrahigh-pressure sterilization equipment, the discharging cage pushing mechanism is installed above the discharging roller seat in a matched mode, and the discharging cage pushing mechanism clamps and drives the cage basket at the discharging end of the ultrahigh-pressure sterilization equipment to move along the discharging roller seat, so that discharging is conducted. By arranging the roller seat, the feeding cage pushing mechanism and the discharging cage pushing mechanism, automatic feeding and discharging of the ultrahigh-pressure sterilization equipment can be realized, so that the conveying efficiency is effectively improved, the production takt is compact, the labor intensity of workers is reduced, and the production number of finished products is reduced.

The invention discloses an ultrahigh-pressure subsurface safety valve, belongs to the technical field of petroleum and natural gas well completion, and aims at solving the problem that an existing subsurface safety valve is prone to leakage under the high-pressure condition. The ultrahigh-pressure subsurface safety valve comprises an upper connector (1), a spring barrel (3) and a lower connector (4) which are sequentially connected from top to bottom, and a piston cavity (28) is formed in the side wall of the upper connector (1); a piston mechanism is connected into the piston cavity (28) in a sealing mode, a positioning sealing nut (9) is arranged in the lower end of the piston cavity (28), and when the valve plate sealing mechanism is in an open state, the piston mechanism is connected with the positioning sealing nut (9) in a metal sealing mode. When the valve plate sealing mechanism is in a closed state, the piston mechanism is in metal sealing connection with the surface of the piston cavity (28). Under the conditions of high pressure and high temperature, the metal sealing connection performance is not easy to change, the product stability is improved, and the purpose of reducing the leakage rate of the safety valve is achieved.

The invention relates to a multi-disaster cooperative prevention and control method and system for fracturing of a heading face coal seam advanced hole exploration area under complex geological conditions, and belongs to the field of mine disaster prevention and control. According to the method, an integrated process of drilling, exploring, pressing and pumping is adopted, and geological exploration is completed through advanced hole exploring construction bedding drilling; on the basis of a segmented retreating type hydraulic fracturing technology, pressure relief and permeability increase of a coal body are achieved in combination with a recoverable packer device; and after fracturing, a gas extraction system is connected by adopting a process of two-plugging one-injection and hole sealing under pressure, and the stability of the roadway is enhanced through an anchor net cable beam supporting system. The matched fracturing system comprises a water tank, a water injection pump, an ultrahigh pressure hydraulic hose, a fracturing sealing pipe column and an integrated monitoring device. Through multi-disaster collaborative design, repeated drilling construction and resource waste are reduced; the anchor net cable beam supporting system enhances the stability of the roadway under the complex geological condition. The scheme has high adaptability and popularization value, and provides reliable technical support for safe mining of coal mines.

The invention discloses an ultrahigh-pressure hydraulic system for a gear press-fitting process and a control method. Comprising a servo motor, an ultrahigh pressure plunger pump, an oil tank, a safety valve, a first electromagnetic stop valve, a proportional overflow valve, a first pressure sensor, a second electromagnetic stop valve, a first throttling damper, a second throttling damper, a third throttling damper, a third electromagnetic stop valve, a fourth electromagnetic stop valve, an electromagnetic pressure retaining valve and a second pressure sensor. By controlling the overflow pressure of the proportional overflow valve, linear pressure loading and pressure relief of the tensioning tool at 0-70 MPa are achieved, on-off of the throttling dampers is controlled, the pump outlet flow is controlled by adjusting the rotating speed of the motor in a matched mode, the pressure difference of the throttling dampers is changed, and linear pressure loading and pressure relief of the tensioning tool at 70-200 MPa are achieved. The device can be used for a 200MPa ultrahigh-pressure hydraulic system, segmented adjustment of loading pressure is achieved, and the pressure increasing or reducing amplitude and slope of tensioning pressure within 0-200MPa can be controlled.

The invention provides a low-torque driving device for an ultrahigh-pressure valve, and belongs to the technical field of valve driving devices.The low-torque driving device comprises an opening and closing control assembly directly connected with a valve rod, the opening and closing control assembly comprises a lead screw nut, a first step limiting part is arranged outside the lead screw nut, and a threaded shaft and a plurality of threaded rollers are arranged in the lead screw nut; the threaded pin rollers are distributed in the circumferential direction of the threaded shaft and meshed between the threaded shaft and the lead screw nut, and the installation assembly is installed on the valve body. The mounting assembly comprises a bearing seat, a locking piece, a bearing gland and a plurality of bearing pieces, and the bearing pieces are distributed in the axial direction of the lead screw nut and arranged on the lead screw nut in a sleeving mode to form a columnar supporting unit. According to the low-torque driving device for the ultrahigh-pressure valve, the friction loss in the opening and closing process of the valve is fully reduced, the bearing capacity in the opening and closing process is improved, the labor-saving effect of driving large axial force through small torque is achieved, the opening and closing portability of the valve is effectively improved, and the low-torque driving device is simple in overall structure and convenient to assemble.

The invention relates to the technical field of cone valve multi-mode air supply-energy dissipation cooperative cavitation reduction devices and control methods, and discloses a fluid control device named'cone valve multi-mode air supply-energy dissipation cooperative cavitation reduction devices and control methods'. The conical valve aims to solve the problems that an existing conical valve is serious in cavitation under the working condition of high pressure difference, air supply and energy dissipation functions are separated, and response lags. The device is characterized by comprising three stages of energy dissipation perforated pipes which are arranged at the outlet end of a valve body in a gradient mode, negative pressure injection air supply pipes which are symmetrically arranged outside a flow guide cover and flow guide fins which are welded to the inner wall of a cone, and the three stages of energy dissipation perforated pipes, the negative pressure injection air supply pipes and the flow guide fins cooperate to achieve pressure gradient pressure relief, self-adaptive air supply and flow state stability; the control method dynamically adjusts the air supply intensity based on the opening degree, the pressure difference and the vibration signal. According to the technical scheme, cavitation inception and collapse impact are remarkably restrained, vibration noise is reduced, the service life of the valve is prolonged, an external air source is not needed, the system pressure drop is controllable, and the system is suitable for ultrahigh pressure difference and large-flow hydroelectric working conditions.

An apparatus for generating an ultra-high pressure fluid jet during drilling comprises a drilling motor; a housing structure connected with the drilling motor; and a drill bit assembly connected at the downstream end of the housing structure. The housing structure comprises an oscillation tool configured to transfer a pressure energy from pumped drilling fluid to a closed loop hydraulic circuit and pressurize the same therein; a pressure intensifier pump configured to increase hydraulic pressure of closed loop hydraulic fluid to an ultra-high pressure; and a pressure transfer tool configured to transfer the ultra-high pressure from the closed loop hydraulic fluid to the low-pressure drilling fluid, without any communication between the drilling fluid and closed loop hydraulic fluid and without requiring the drilling fluid to enter pressure intensifier pump. The ultra-high pressure of drilling fluid is directed to the drill bit assembly to aid drilling efficiency in drilling applications.

The invention provides a 3D printing metal material and a modification method thereof, and relates to the technical field of metal modification. According to the modification method of the 3D printing metal material, metal titanium / titanium alloy for laser 3D printing serves as an initial material, a wrapping material and a packaging layer are sequentially formed to obtain a synthetic block, and then the 3D printing metal titanium with high toughness is obtained through a direct high-pressure treatment process. The ultra-high pressure can inhibit long-range diffusion of atoms, so that coarsening of crystal grains at high temperature is avoided; meanwhile, grain refinement can be generated in the metal titanium / titanium alloy through high pressure, and therefore the strength of the metal titanium / titanium alloy is improved; the defects such as holes and microcracks in the metal component can be repaired through high pressure; more dislocation, twin crystal and other strengthened defect structures can be generated in the metal part at high temperature and high pressure; high-temperature heat treatment under high pressure can eliminate residual stress and distribution of a non-uniform phase, and the ductility is improved.