401 results about "Pressure injection" patented technology

The invention discloses a self-adaptive control method for underground coal mine hole sealing and grouting, and belongs to the technical field of well hole packing. The method comprises the steps that plugging bags are sequentially installed at the cross sections of two drill holes of an underground coal mine working face, compressed air is injected into the plugging bags, and a cylindrical space between the bags is filled with multi-stage coal powder distribution materials in a layered mode and compacted; mixing ordinary Portland cement, a composite expanding agent, a carboxyl water reducer, a hydroxypropyl methyl cellulose stabilizer and water according to a preset ratio, and screening; stepwise pressure injection is implemented, and the grouting pressure and rate are regulated and controlled in a variable-rate climbing mode, a constant-pressure variable-speed mode and a proportional attenuation mode; and constant-temperature and constant-humidity maintenance is conducted on the grouting completion area, so that the desorption value of the drilling cuttings is reduced to a target value. According to the scheme, the grouting process parameters can be optimized, and the grouting quality is improved.

The invention discloses a method for fracturing a low-permeability coal seam by linkage of CO2 and high-pressure water, which comprises the following steps of: performing hydraulic fracturing to form a part of fractures, forming a weak acid environment by utilizing the characteristic that a CO2 medium is easily dissolved in high-pressure water in a high-pressure environment, and promoting chemical reaction between acid water and mineral components on the surfaces of the fractures under the driving of concentration gradient and high-pressure injection, the fractures are pressed by high-pressure water at the same time, so that cooperative work of high-pressure fracturing and CO2 acidification anti-reflection is achieved, and a complex fracture network is formed in the coal seam; after permeability increasing, the pressure is relieved, the normal pressure environment is recovered, at the moment, CO2 media dissolved in the high-pressure water in the layer penetrating drill holes are partially recovered to be in the gas state, CO2 gas and gas can form competitive adsorption in the coal seam, a large amount of gas is displaced and desorbed from the interior of the coal seam, in the whole process, the permeability increasing effect on the coal seam can be effectively achieved, and the coal seam permeability increasing effect is achieved. And no extra damage is caused to the coal seam, finally, on the premise that more energy is not consumed, effective transformation of the pore structure volume of the coal body is achieved to the maximum extent, and the gas extraction efficiency is improved.

The invention provides a flame-retardant magnesium alloy with efficient forming diversification and a preparation method of the flame-retardant magnesium alloy. The flame-retardant magnesium alloy comprises the following components in percentage by mass: 4.0-10.0% of Al, 0.2-1.6% of Ca, 0.01-0.5% of Mn, 0.1-1.5% of RE, less than or equal to 0.05% of inevitable impurities and the balance of Mg, and the added RE is one or any combination of Ce, Sm, La and Sr. The preparation method comprises the following steps: smelting and casting, granulating and pulping, and performing pressure injection molding. According to the preparation method, diversified efficient forming of complex curved surfaces, thin-wall parts, special-shaped components and the like can be achieved through cooperative regulation and control of components, the process and the structure, and the obtained flame-retardant magnesium alloy is compact in structure, has the multi-level structural characteristics including a spherical primary solid phase, a fine solidification secondary phase and a grain boundary net-shaped eutectic phase and meanwhile has good flame retardance and mechanical performance; the ignition point is 750-1200 DEG C, the yield strength is 130-200 MPa, the tensile strength is 230-300 MPa, the ductility is 5-20%, and the aluminum alloy is suitable for industrial production.

The utility model discloses a pressure injection molding mold, which is characterized in that a fixed mold comprises a fixed mold seat, a fixed mold plate fixed on the fixed mold seat and a fixed mold core fixedly arranged on the fixed mold plate, and a concave fixed mold cavity is formed on the fixed mold core; the movable mold comprises a movable mold base, a movable mold plate fixed on the movable mold base, and a movable mold core fixed on the movable mold plate; the movable mold core is provided with a movable mold base and a movable mold plate, the ejector plate can slide in the mold closing direction and is installed between the movable mold base and the movable mold plate, the ejector rod is fixedly installed on the ejector plate, the ejector reset spring provides elastic retaining force towards the movable mold base direction for the ejector plate, and the oil cylinder is fixedly arranged on the movable mold plate. The oil cylinder can drive the ejector plate to move towards the movable mold plate, so that the ejector rod ejects a bearing pad blank to be subjected to pressure injection of a composite wear-resistant layer in the movable mold cavity towards the fixed mold, and an ejector roller on an injection molding machine prevents the ejector plate from moving along with the movable mold base during mold opening, so that discharging is achieved. And stable development and timeliness of the project are ensured.

The invention discloses a low-permeability rock breakthrough pressure testing method based on schlieren imaging. The method comprises the following steps: putting a test rock sample into a confining pressure cavity of a rock sample holder; the injection end of the rock sample holder is connected with the fluid injection module, the outlet end of the rock sample holder is connected with the schlieren cavity, and the confining pressure cavity is connected with the confining pressure injection module; vacuumizing a pipeline of the testing device, injecting a degassed purified water medium into the schlieren cavity, and then carrying out optical path debugging until a clear schlieren image is acquired; loading confining pressure stress on the test rock sample, injecting water until the test rock sample is saturated, injecting carbon dioxide, observing a schlieren imaging system, recording a schlieren image of carbon dioxide breakthrough by a high-precision camera when the carbon dioxide breaks through the saturated rock sample, recording the breakthrough moment of the carbon dioxide, and recording the upstream and downstream pressure difference value at the moment; the breakthrough pressure is the breakthrough pressure of the carbon dioxide of the tested rock core sample. According to the invention, a trace concentration of carbon dioxide can be visually observed to break through the rock sample, so that the breakthrough pressure of the low-permeability rock can be accurately detected.

The provided is a device for preparing an artificial aggregate by pressure injection and solidification of a powder-based solid waste, pelletization, and magnetic shell reinforcement. The device includes a pressure injection and solidification module, a rolling particle screening module, a zonal temperature-controlled sintering module, and a magnetic shell reinforcement module that are arranged in sequence from front to back, where the pressure injection and solidification module, the rolling particle screening module, the zonal temperature-controlled sintering module, and the magnetic shell reinforcement module are connected by conveyor belts. The device provides a function of pressure-injecting slurry with a specific function into the center of the artificial aggregate to improve the overall performance of the artificial aggregate. The device achieves rapid aggregate pelletization, and provides pressure for the forming process through elastic wheel sets.

The invention relates to a method for manufacturing a post device (10) comprising a tubular plastic element (1) and a post (2) formed from a mouldable material and arranged in the tubular plastic element (1), this method comprising a step of pressure injection moulding the mouldable material into the tubular element (1), wherein the tubular element (1) is arranged, during the pressure injection moulding step, in a direction inclined relative to a horizontal plane (21).

The invention discloses automobile structural member high-performance aluminum alloy die-casting equipment, and relates to the technical field of automobile structural member die-casting molding, the automobile structural member high-performance aluminum alloy die-casting equipment comprises a base, and a pressure injection device is fixed on the upper end face of the base; the supporting seat is fixed on the base; the movable mold plate is arranged on the supporting seat in a sliding manner; the press machine is fixed in the supporting seat, and the output end of the press machine is connected with the bottom of the movable template; the fixed mold plate is fixed on the supporting seat and is communicated with the pressure injection equipment; the pressurizing assembly is fixed to the supporting base, and the output end of the pressurizing assembly is connected with the movable mold plate; the multiple self-locking assemblies are arranged in the fixed mold plate in a sliding mode; the mold locking assembly is installed on the upper end face of the supporting base.

The present invention discloses a shelling cylinder control method and system based on air pressure detection, which belongs to the field of aluminum electrolysis technology, including: obtaining a waveform diagram and a voltage change curve of the shelling cylinder during the whole shelling process; constructing a shelling cylinder digital model based on the waveform diagram and the voltage change curve; collecting the air pressure of the shelling cylinder in real time, generating control instructions according to the air pressure, voltage and the shelling cylinder digital model; and automatically controlling the shelling cylinder based on the control instructions. Compared with the traditional cylinder, the present invention can retract the hammer head in advance through time setting, reduce the soaking and loss of the hammer head, intelligently detect whether the hammer head has penetrated the shell surface and issue an alarm, and intelligently detect the jamming of the hammer head and issue an alarm, thereby improving production efficiency and product quality.

The invention relates to the technical field of plastic molding processes, and discloses a negative pressure injection molding plastic molding method and device. The method comprises the steps that in the negative pressure injection molding process, gas parameter data of a plurality of monitoring points in a mold cavity are obtained in real time; based on the change of the gas parameter data of each monitoring point, identifying the state of the gas pushed by the melt, and determining the propulsion path of the melt flowing front edge in the cavity; according to the propelling path, the melt filling progress and the filling time sequence of all areas in the cavity are calculated; and based on the filling progress and the filling time sequence, generating evaluation information of the filling state of the melt in the cavity. According to the method, the real-time visual prediction of the melt filling process in the mold is realized, and the control accuracy of the negative pressure injection molding process and the stability of the product quality are improved.

The utility model provides a vertical low-pressure injection molding machine which comprises a rack, a mold pressing plate, a material nozzle floating plate and an injection molding barrel, a positioning seat is arranged on a workbench of the rack, and an injection molding mold is positioned and mounted on the positioning seat; the mold pressing plate is mounted above the positioning seat in a lifting manner and is used for pressing the injection mold during injection molding; the material nozzle floating plate is installed above the die pressing plate in a lifting mode, and a driving piece is installed on the material nozzle floating plate. The injection molding material cylinder is installed on the material nozzle floating plate, the lower end of the injection molding material cylinder is provided with a material injection nozzle, and the material injection nozzle penetrates through the mold pressing plate and is arranged on the lower side of the mold pressing plate; the upper end of the injection molding material cylinder is connected with a material pushing air cylinder, and a material pushing rod of the material pushing air cylinder is arranged in the injection molding material cylinder; the vertical low-pressure injection molding machine overcomes the defects that an existing injection molding machine is high in pressure and poor in injection molding quality, and the injection nozzle is prone to glue leakage.

The invention relates to an automatic mold core pressing system for high-temperature alloy precision casting, which is applied to the related technical field of pressure injection molding and can realize automatic continuous pressure injection, effectively reduce the dependence on manpower, reduce the influence of human factors on the product quality and improve the production efficiency, and various devices are integrated on one device, so that the production cost is reduced, and the production efficiency is improved. Compared with the mode that multiple devices are matched with one another in the prior art, the occupied area is greatly reduced, and cost input is reduced; meanwhile, through the arrangement of the quick change unit, automatic quick change of different pressure injection molds can be realized, compared with a change mode of manually disassembling an old mold and then installing a new mold in the prior art, the time of halting for mold change is greatly shortened, the influence on the production efficiency during mold change is effectively reduced, and meanwhile, through the arrangement of the deviation measuring unit, the production efficiency is improved. And real-time monitoring and self-fine adjustment of the position can be carried out in the die changing process, so that the die changing efficiency is effectively guaranteed, the downtime is further shortened, and the production efficiency is improved.

The invention discloses a forming processing method of a composite material gas cylinder, which comprises the following steps of: positioning and embedding a pre-processed metal valve seat into a cavity of an injection mold, and performing high-pressure injection molding to form a lining pre-formed body wrapping the metal valve seat; and transferring the liner preform to blow molding equipment for blow molding integrated molding to prepare the gas cylinder liner which is integrated with the metal valve seat in a weldless manner, zero in interface gap and high in bonding strength. The method comprises the following steps: calculating laying parameters of a composite gas cylinder winding layer by adopting a grid theory on the basis of a dry-method prepreg yarn principle, and obtaining a laying layer design scheme; laying a carbon fiber winding layer on the outer surface of the gas cylinder lining subjected to surface treatment according to a laying design scheme based on a dry-method prepreg yarn winding technology; and the high-pressure composite material gas cylinder product is obtained through cooperative treatment of heating curing and mold pressing. The problems that the precision requirement of a traditional technology is difficult to meet and labor cost is high are solved.

The invention discloses an energy-saving reaming device for geological exploration, and relates to the technical field of geological exploration. The device comprises a supporting body disc, a pinch plate supporting body and a center fixing body, a swinging reaming blade is arranged outside the center fixing body, and the angle of the reaming blade is controlled through water pressure injected into a drill rod. A piston disc, an outer side sleeve, an inner side sleeve and a thread transmission structure are arranged, so that the broaching blade is gradually unfolded; and meanwhile, stable locking of the reaming angle is achieved through cooperation of the locking limiting block and the locking limiting shaft. The device is provided with an exhaust hole, an injection hole and a one-way valve, and it is ensured that fluid pressure is effectively adjusted in the reaming process. Different from a traditional mode that the drill bit needs to be replaced many times, the device can finish reaming of different diameters only through one-time replacement, energy consumption is remarkably reduced, efficiency is improved, and the device is particularly suitable for deep well and shale gas exploitation operation.

The invention relates to the technical field of high-pressure injection control, and discloses a high-pressure injector intelligent control system based on the 5G technology. An injection pressure dynamic adjusting module driven by a microcontroller of the system analyzes pressure fluctuation characteristics and generates a primary pressure compensation instruction; the fluid state reconstruction module is used for calculating fluid state reconstruction parameters in combination with the real-time flow velocity data; the multi-channel cooperative control module distributes a pressure compensation weight and generates a channel cooperative instruction set based on reconstruction parameter analysis; the abnormal pressure tracing module monitors abnormal pressure sudden change points of each unit, traces corresponding fluid state parameter change tracks and outputs tracing mark data; the injection path optimization module re-plans a propulsion path trajectory based on the marked data to generate a three-dimensional path optimization parameter table; and the safety threshold self-correction module dynamically adjusts the boundary value of the pressure threshold sequence according to the track offset, and outputs an updated safety threshold parameter set to the microcontroller.

The invention relates to the technical field of hydrogeological parameter measuring equipment, and discloses intelligent field in-situ double-ring infiltration equipment with micro-change negative pressure downward injection-water supply double control. A vacuum pressure sensor and an electromagnetic valve are combined, a vacuum negative pressure tiny change caused by liquid level height change in an inverted Markov bottle is controlled to respectively control an air suction-water supply process and a non-air suction-water injection process, and the liquid level heights of an inner ring and an outer ring are uniformly set to keep a constant water head; the automatic, high-precision and intelligent double-ring infiltration instrument with the vacuum negative pressure guaranteeing complete circulation of the testing process along with time is achieved, the observation time can be shortened to a certain extent while labor is saved, water injection height stability and consistency are kept so as to improve the observation precision, the whole infiltration speed change process including initial infiltration can be completely recorded, and the measurement accuracy is improved. The accurate soil body infiltration rate is obtained; and the infiltration characteristics of the soil body are mastered.

The invention discloses drilling and polishing combined machining equipment based on hardware precision machining, and relates to the technical field of machining machine tools, the drilling and polishing combined machining equipment comprises a drilling machine, a hydraulic telescopic rod is arranged on the outer side of the drilling machine, a machining assembly is arranged at the telescopic end of the hydraulic telescopic rod, and the drilling and polishing combined machining equipment further comprises a drilling supporting table arranged below the machining assembly; a clamping assembly is arranged at the top of the drilling supporting table. The supporting pieces are pushed to move and rise through magnetic force, the multiple supporting pieces can be attached to the bottoms of the workpieces under the action of magnetism, liquid is injected into the mounting frame through the injection molding assembly after attachment is completed, the supporting pieces can be kept stable after rising, and annular attachment supporting is conducted on the positions, needing drilling, of different workpieces.

The utility model relates to the technical field of low-pressure injection molds, and discloses a fixing structure for a hanging needle of a low-pressure injection mold, comprising a mold template, a pressing block movably installed on the other side of the mold template, a hanging needle body movably penetrated on one side of the pressing block, and a connecting round block fixedly installed on one end of the hanging needle body, so that the worm wheel meshing with the worm can be rotated when the worm rotates, and the sliding block can be made to slide in the inner cavity of the groove by the coordinated use of a threaded tube and a threaded rod, so that the limiting block fixed on the sliding block can be inserted in the inner cavity of the limiting groove, so that the hanging needle body can be installed conveniently and can be prevented from loosening, thereby improving the effect of fixing the fabric, and the worm can be driven to rotate conveniently by setting a card block movably inserted in the inner cavity of the card groove, and the first magnet and the second magnet can be set to facilitate the replacement of a damaged driving block, so as to prevent the damage of the driving block from affecting the subsequent disassembly or replacement efficiency of the hanging needle body.

The invention relates to the technical field of injection molding equipment, and discloses automobile interior trim part low-pressure injection molding equipment which comprises a machine shell, a movable mold mechanism and a fixed mold mechanism which are matched with each other to complete injection molding are arranged in the machine shell, and smoothing mechanisms are arranged in the machine shell and are arranged on the upper side and the lower side of the fixed mold mechanism; compared with the prior art, the mold has the beneficial effects that along with the reciprocating linear motion of the movable mold mechanism, the flattening mechanism flattens the covering layer, the situation that the covering layer is wrinkled in the injection molding process and consequently follow-up use is affected is avoided, the quality of injection molding finished products is improved, meanwhile, the product quality is improved, and meanwhile the product quality is improved. The movable mold mechanism can drive the fixed mold mechanism to fix the covering layer through adsorption, the covering layer is prevented from sliding in the injection molding process, and the quality of injection molding finished products is further improved.

The invention discloses a method and a device for measuring the breakthrough pressure of a low-permeability cap based on absorption spectrum sensing. The measuring device comprises a confining pressure injection module, a data monitoring module, a return pressure setting module, an absorption spectrum sensing module, a rock core holder module and a pore pressure injection module. According to the invention, the breakthrough pressure of the low-permeability cap layer can be tested, the test work can be reliably and efficiently completed, and a pressure signal and an absorption spectrum signal are comprehensively utilized; the absorption spectrum is innovatively applied to the breakthrough pressure test, the rock sample breakthrough moment can be accurately and effectively judged, the sensitivity limitation and delay of pressure monitoring in the low-permeability cover layer test are avoided, and a good detection and tracking system is provided for breakthrough pressure calculation, breakthrough position and form change of displacement fluid; meanwhile, according to the gas monitoring function, the process and efficiency of gas breaking through the rock core can be monitored in real time to a certain extent.

The invention provides an oil reservoir flow regulating agent injection system, a control method thereof and a storage medium, and relates to the field of filling equipment. The system comprises a central control module, a spiral lifting feeding module, a skid-mounted stirring tank module and a high-pressure flow regulating pump skid-mounted module, and the spiral lifting feeding module comprises a shaftless spiral lifting machine, a discharging hopper and a variable-frequency speed regulator; the skid-mounted stirring tank module comprises a tank body, a stirring and mixing module and a signal acquisition module; the signal acquisition module comprises a liquid level sensor and an online viscometer which are mounted on the tank body. According to the oil reservoir flow regulating agent injection system, full-process automatic operation of the flow regulating agent from raw material conveying to high-pressure injection is achieved.

The utility model relates to the technical field of low-pressure injection molding equipment, and discloses a low-pressure injection molding adjustable cloth hanging needle combined mechanism which comprises a mounting frame body and a cloth hanging needle, a movable mounting block is mounted at the bottom of the cloth hanging needle, and a limiting assembly is mounted in the mounting frame body; a storage groove is formed in one side of the cloth hanging needle, a cutter strip is slidably mounted in the storage groove, a mounting groove communicated with the storage groove is formed in the movable mounting block, a moving assembly driving the cutter strip is mounted in the mounting groove, a stop block is mounted at the bottom of the mounting frame, and when the cloth hanging needle moves, the stop block limits the moving assembly. And the moving assembly moves the cutter strip out of the storage groove. Compared with the prior art, the fabric cutting device has the advantages that when the moving range of the movable mounting block and the cutter strip is large, and the sliding deformation space is insufficient, the sliding block is limited through the check block, the sliding block drives the cutter strip to move out of the containing groove, fabric is cut, and the hand is protected when the fabric is mounted.

The utility model discloses a high-pressure injection molding platform of a high-speed copper cable, which comprises an injection molding assembly for carrying out injection molding on a cable of the high-speed copper cable, and further comprises a clamping tool I and a clamping tool II, the clamping tool II comprises a base, and the base is provided with a groove I for installing the cable at the rear end of the high-speed copper cable; an upper cover is hinged to one side of the upper end face of the base, a groove II matched with the groove I is formed in the lower surface of the upper cover, and anti-skid layers are arranged on the contact faces of the groove I and the high-speed copper cable and the contact faces of the groove II and the high-speed copper cable. A buckle used for fixing the closed upper cover is hinged to one side wall of the base. A PCB at the front end of a high-speed copper cable is fixed through the clamping tool I, a base groove I of the clamping tool II is matched with an upper cover groove II, a cable at the rear end is limited, front and back dual fixation is formed, meanwhile, the friction force between the anti-skid layers on the groove I and the groove II and a cable sheath is increased, and the cable is prevented from sliding.

The invention discloses a detection device and method of high-pressure jet grouting pile equipment for a water conservancy project, and relates to the technical field of high-pressure jet grouting, the detection device comprises a supporting frame and further comprises a positioning device, a storage barrel is fixedly installed at the top of the supporting frame, a servo motor is fixedly installed on the rear side of the storage barrel, a rotating rod is fixedly installed at the output end of the servo motor, and the rotating rod is fixedly connected with the positioning device. A U-shaped rod is fixedly installed on the circumferential face of the rotating rod, an extrusion rod is fixedly installed on the circumferential face of the rotating rod, a supporting plate is fixedly installed on the front side of the supporting frame, a driving device is fixedly installed on the front side of the supporting plate, and a T-shaped plate reciprocates to position and correct the high-pressure injection connecting rod to ensure that the high-pressure injection connecting rod moves downwards at a vertical angle. And the position of the high-pressure injection connecting rod can be corrected through reciprocating movement of the T-shaped plate, so that the high-pressure injection connecting rod is prevented from deflecting in the rotary injection process.

The utility model discloses a refractory brick rapid demolding machine which comprises an equipment frame, a supporting platform is movably arranged in the equipment frame, and a collecting tank used for collecting sliding refractory clay during overturning of the supporting platform is arranged at the bottom of the equipment frame. A refractory brick mold is placed on the upper portion of the supporting platform, adjusting mechanisms for driving the refractory brick mold to ascend and descend are arranged on the two sides of the equipment frame, and a pressure injection mechanism for conducting pressure injection on refractory clay in the refractory brick mold is arranged on the equipment frame. After the refractory brick mold is filled with refractory clay, one-time synchronous pressing or step-by-step pressing can be achieved, after the refractory bricks are pressed and formed, the pressing and injection state of the pressing and injection mechanism is kept, the refractory brick mold can be lifted upwards, the refractory bricks can be rapidly separated from the mold and left on the supporting platform, and the refractory brick demolding efficiency is greatly improved.

The utility model relates to the technical field of engineering machinery, in particular to a pressure injection oil filling device which comprises a movable base and a cylinder body connected to the base and further comprises a pump body mechanism connected to the base and used for driving oil liquid to flow. The oil storage bin is located in the cylinder body and used for receiving and storing oil liquid, and the output end of the oil storage bin communicates with the input end of the pump body mechanism through a first channel. By means of the pump body mechanism, the oil liquid in the oil storage bin is guided into the oil guide bin till the oil guide bin is filled with the oil liquid. And then the output end of the connecting mechanism is connected with the input end of a to-be-added suspension cylinder, then the pump body mechanism is used for enabling oil in the oil storage bin to continuously flow into the oil guide bin, and the oil in the oil guide bin is continuously guided into the suspension cylinder through the connecting mechanism, so that the problem is solved.

The present invention belongs to the technical field of injection molding system, and provides a thin-walled product thermal expansion low-pressure injection molding system, including an upper mold cavity and a lower mold cavity, the product is located between the upper mold cavity and the lower mold cavity, a heating rod and a cooling pipe are arranged between the upper mold cavity and the lower mold cavity, and an aluminum expansion block is also arranged between the upper mold cavity and the lower mold cavity, the heating rod heats the aluminum expansion block to increase its volume and increase the distance between the mold cavities, and the cooling pipe cools the aluminum expansion block to reduce its volume. The advantage of the present invention is that when the product is injection-molded and filled, the higher expansion performance of the aluminum block is used to increase the product thickness, and when the injection molding filling is completed and the pressure is maintained, the aluminum block is cooled to return the product thickness to normal thickness, thereby achieving the purpose of low-pressure injection molding.

This invention provides a method for preparing high-purity silicon carbide parts based on low-pressure injection molding, belonging to the field of silicon carbide material preparation technology. The invention involves mixing wax, dispersant, reinforcing agent, and silicon carbide powder with a purity ≥99.995wt% in a mixer. The resulting slurry is placed in a low-pressure injection molding machine and injected into a mold under heating and pressurization conditions for molding. After demolding, the resulting preform undergoes dewaxing and debinding treatment. The dewaxed preform is then placed in a purified graphite kiln and sintered in a high-temperature resistance furnace to obtain the high-purity silicon carbide parts. This invention eliminates all possible introduction of metallic impurities during the material preparation, molding, dewaxing, and sintering processes, enabling the preparation of high-purity silicon carbide parts with a purity ≥99.99wt%.

The present invention relates to the technical field of composite material preparation, and particularly relates to a preparation device and a preparation method for near-net-shaped large-size carbon / carbon composites, including a vacuum pumping system, a resin high-pressure injection system, a heating system, an upper support plate, a lower support plate, a resin injection pipeline, an upper mold provided on the bottom surface of the upper support plate, a lower mold provided on the lower support plate, and an air extraction port provided on the upper mold. A fixed support column is provided on the lower support plate and is connected through a horizontal adjustment mounting assembly. A through hole adapted to the fixed support column is provided on the upper support plate. The resin injection pipeline passes through the upper mold and extends into the molding cavity formed by the closing of the upper mold and the lower mold. The resin injection pipeline includes a main injection pipeline and a plurality of branch injection pipelines connected to the main injection pipeline and evenly distributed from the upper part to the lower part of the molding cavity. The fixed support column penetrates through the through hole on the upper support plate to ensure the alignment of the fixed support column with the through hole on the upper support plate, which is convenient for actual operation.

The application belongs to the technical field of high-pressure die casting production of lower vehicle body, and particularly relates to an integrated lower vehicle body double-pressure injection die casting process, which realizes rapid forming production of the lower vehicle body through cooperation of two pressure injection systems and a die casting die module with a double pouring system. The integrated forming of the lower vehicle body can be realized at one time through the die casting process, and the production efficiency of the lower vehicle body is greatly improved. Meanwhile, the die casting machine has two independent pressure injection systems which cooperate with a double-pressure injection position pouring system. The integrated lower vehicle body is filled symmetrically, the pouring efficiency of the lower vehicle body is ensured, and the uniformity of the mixed aluminum liquid is ensured through counter-attack of the two pouring systems.