303 results about "Cavity pressure" patented technology

The invention relates to the technical field of precise injection molding control, and discloses an injection molding process parameter self-adaptive compensation system which comprises a multi-source sensing module used for collecting mold cavity pressure, melt temperature and screw displacement information in the injection molding process in real time; the data fusion module is used for performing time sequence synchronization, space registration and noise suppression on the multi-source sensing data; the dynamic modeling module is used for constructing a dynamic model of an injection molding process state based on the fused process data and outputting a state estimation value; and the stability analysis module is used for carrying out system stability analysis based on the dynamic model and generating a control compensation strategy. Cooperative control of precise positioning and high-pressure response is realized through a composite driving framework and a dynamic disturbance compensation technology; an incremental learning algorithm and a multi-dimensional quality evaluation system are combined, a process parameter self-evolution mechanism is constructed, material characteristic drift and complex working condition disturbance are effectively dealt with, and closed-loop optimization from process control to quality feedback is formed.

The invention relates to the technical field of parameter optimization, in particular to a plastic mold forming parameter optimization method and system based on big data, and the method comprises the following steps: collecting pressure data, calculating an acceleration sequence, recognizing a peak window, matching a pressure-temperature ratio, and building a combined cluster to obtain an optimization result set. According to the method, a speed increasing sequence is constructed based on the die cavity pressure change rate, a high-dynamic section is screened through a peak value ratio, automatic identification of an effective forming section is achieved in combination with continuous ratio stability judgment, forming pressure, die temperature and a cooling time sequence are collected to construct a parameter combination sequence, trend consistency is compared, and available combinations are screened; the parameter acquisition granularity, the process identification precision and the parameter group suitability are obviously improved, the problems of subjective interference and error accumulation in the parameter configuration process are effectively avoided, the objective quantitative analysis capability of the forming process state is enhanced, and the accuracy of the forming process state is improved. And the plastic mold forming process stability and the parameter configuration efficiency are improved.

The invention relates to the technical field of deep learning, and discloses an earphone mold injection molding parameter optimization method, device and equipment, and the method comprises the steps: collecting temperature distribution data and mold cavity pressure data in an earphone mold cavity, and carrying out earphone shell injection molding dynamic analysis to obtain an earphone shell material flow curve; carrying out topological characteristic analysis on the earphone shell material flow curve, and constructing an earphone shell injection molding process parameter model; based on the earphone shell injection molding process parameter model, the mold cavity temperature and the mold cavity pressure serve as state variables, the heating power and the injection pressure serve as control variables, and an earphone shell injection molding optimization controller is constructed; the earphone shell injection molding optimization controller is connected with the injection molding machine control system, the heating power and the injection pressure of the earphone mold are adjusted in real time, the optimal technological parameters of the earphone mold are solved, a real-time feedback and parameter fine adjustment mechanism is adopted, the injection molding machine control system can quickly respond to technological fluctuation, and the consistency of product quality is guaranteed.

The invention discloses an anti-liquid-impact compressor cylinder structure, a compressor and a wellhead natural gas compression method, and relates to the technical field of compressors, the cylinder structure comprises a cylinder barrel and a piston ring assembly, a piston cavity is formed in the cylinder barrel, the cylinder structure further comprises a partition plate, the partition plate divides the piston cavity into a working cavity and a buffering cavity, and the piston ring assembly is arranged in the working cavity; the communication channel is used for realizing mutual communication of the working cavity and the buffer cavity on the two sides of the partition plate; the partition plate is configured in the mode that when the pressure difference between the pressure of the working cavity and the pressure of the buffer cavity exceeds a set threshold value, the fixed relation of the partition plate in the piston cavity is damaged under the pressure difference between the two sides of the partition plate, the partition plate can move towards the side where the buffer cavity is located under the pressure difference, the compressor comprises the cylinder body structure, and the compression method is achieved based on the cylinder body structure. According to the scheme, the maximum pressure in the cylinder is reduced by adopting a method of expanding the clearance volume of the cylinder body when the liquid impact phenomenon occurs, and the response speed in the clearance volume expanding process can be effectively optimized.

The invention relates to the technical field of plastic production, in particular to an intelligent processing method and system for plastic mold process parameters. The method comprises the following steps: carrying out a mold cavity pressure test on plastic mold equipment to obtain mold cavity pressure distribution data; constructing a local flow field model of the exhaust groove according to the pressure distribution data of the mold cavity; performing pressure transfer characteristic analysis by using the exhaust duct local flow field model to generate pressure transfer increase characteristic data; predicting the actual exhaust capacity of the exhaust groove according to the pressure transmission increase characteristic data, and generating actual exhaust capacity prediction data; intelligent inflation and exhaust control is carried out through the actual exhaust capacity prediction data, and optimized exhaust control parameters are obtained; and performing exhaust groove cooperative work control according to the optimized exhaust control parameters, and generating intelligent exhaust control sequence data. By dynamically adapting to analysis of the pressure change of the mold cavity, accurate control over intelligent inflation and exhaust is achieved, the exhaust efficiency is optimized, product defects are reduced, and the quality of plastic products is effectively improved.

The invention discloses a vacuum cavity pressure maintaining test and leak rate rapid estimation method and system, and the method comprises the steps: achieving the test preparation of multiple sections through a public metering manifold and a multi-way isolation valve, and building a section volume database; the pressure and temperature data are synchronously collected in a fixed sampling period by exhausting air to preset pressure and isolating a pump end; obtaining an equivalent pressure change rate through temperature normalization and deflation baseline deduction in combination with filtering and regression algorithms, and performing conversion to obtain a standardized leak rate; step-by-step detection is carried out on each functional section of the cavity through a segmented bipartite isolation strategy and volume correction, and rapid positioning of a suspicious leakage section is realized; through double-threshold determination of an early warning threshold and an unqualified threshold, a detection report is automatically generated and written into a historical database, and a detection-determination-maintenance closed loop is formed. The method can improve the precision of leak rate detection, and is suitable for vacuum coating equipment, semiconductor process equipment and industrial vacuum treatment devices.

A coating die head includes a die head body, a cavity pressure adjusting block and a regulating assembly. A material cavity is arranged in the die head body, and a first wall surface of the material cavity has a through hole. The cavity pressure adjusting block is arranged in the material cavity, the cavity pressure adjusting block comprises a cavity that is located inside the cavity pressure adjusting block, the cavity pressure adjusting block is configured to change a volume with a pressure change of the cavity, one side wall surface of the cavity pressure adjusting block facing towards the first wall surface is a second wall surface, and the second wall surface is fitted with the first wall surface and surrounds a region where the through hole is located. The coating die head may be integral to a coating equipment.

The invention relates to the technical field of injection molding control, in particular to a bumper foam molding deformation control method based on artificial intelligence, which comprises the following steps: judging whether initial injection pressure exceeds a normal range required for inhibiting foaming, and adopting subsection control or predicting whether the fluidity of a foaming melt has an out-of-control risk; according to the out-of-control risk value, a corresponding adjusting strategy is adopted in combination with the weight coefficients corresponding to the multiple sprues, and the injection molding adjusting speed is obtained or the initial mold temperature is reduced; according to the injection molding speed and the weight coefficient of the multiple sprues, calculating and predicting whether the tail end of the cavity is subjected to material shortage and uneven foaming, and reflecting whether the adjustment degree of the initial injection molding speed and the mold temperature is reasonable or not through the material shortage risk; and determining the foaming degree of the foaming melt in the inspection mold according to the material shortage risk, or reducing the adjustment amplitude of the initial injection molding speed or the initial mold temperature and adjusting the actual cavity pressure in the mold to compensate the adjustment amplitude. The performance of the bumper is improved through the foaming forming technology.

The invention provides a compressor intelligent control method and system based on dynamic pressure relief and a storage medium, and the method comprises the steps: firstly, capturing the multi-physical field coupling characteristics of a compressor in a shutdown state in real time by deploying a pressure, temperature, vibration and current four-dimensional sensing network; secondly, based on a preset pressure entropy model, fusing the pressure fluctuation intensity, the temperature anomaly index, the high-frequency vibration factor and the current attenuation coefficient to quantitatively evaluate a pressure entropy value, and triggering a three-stage pressure relief mode based on the pressure entropy value; then, based on the deviation between the cavity pressure and the target pressure, pressure relief parameters are dynamically adjusted, and stable pressure transition is achieved; and finally, collecting full-link data of pressure relief operation, and dynamically optimizing pressure entropy model parameters based on reinforcement learning, so that the system continuously adapts to equipment aging and working condition changes. Through dynamic closed-loop adjustment, pressure relief energy consumption waste and equipment loss are reduced, and the stability of the pressure relief process is improved.

The invention discloses an injection molding process closed-loop parameter adjustment method which comprises the following steps: S1, collecting real-time injection molding data to form a real-time cavity pressure curve; s2, the mold intelligent terminal compares the real-time cavity pressure curve with the standard cavity pressure curve, compares feature point numerical values, calculates the difference between the real-time cavity pressure curve and the standard cavity pressure curve and judges the difference, and if the difference is within a preset range, injection molding continues to be conducted according to the current injection molding process parameters; if the difference is not within the preset range, executing the step S3; s3, the mold intelligent terminal automatically adjusts injection molding process parameters according to the difference and the injection molding process parameters corresponding to the current real-time cavity pressure curve and inputs the injection molding process parameters into the injection molding machine, and the injection molding machine carries out injection molding again; and S4, the steps S1-S3 are repeated until the difference between the real-time cavity pressure curve and the standard cavity pressure curve is within a preset range, and closed-loop control is formed. According to the invention, the injection molding process is digitalized, closed-loop control is realized, the efficiency is high, the precision is high, and the systematization degree is high.

The invention provides a stepped disc cavity pressure adjusting device and a gas turbine engine, and belongs to the technical field of gas turbine engines, the stepped disc cavity pressure adjusting device comprises a gas compressor shaft, a gas compressor final-stage disc, a bearing seat, a bearing and a gas compressor final-stage stator inner ring, and a gas compressor final-stage disc vent hole is formed in the disc spoke low radius position of the gas compressor final-stage disc; the air compressor final-stage disc, the air compressor final-stage stator inner ring, the bearing seat, the bearing and the air compressor shaft form an air compressor final-stage disc rear cavity, the air sealing ring is arranged in the air compressor final-stage disc rear cavity, a multi-echelon labyrinth structure is arranged on the disc face of the rear side of the air compressor final-stage disc, the air sealing ring is provided with a cantilever structure, and the cantilever structure and labyrinth form a stepped throttling structure. The rear cavity of the last-stage disc of the gas compressor is divided into a plurality of sub-cavities; the air sealing ring is provided with an air sealing ring vent hole, and the bearing seat is provided with a bearing seat upper vent hole and a bearing seat lower vent hole. According to the scheme, the axial force balance of the rotor is achieved by adjusting the pressure of the rear cavity of the last-stage disc of the air compressor in an echelon mode, and the bleed air utilization efficiency is improved.

The invention relates to the technical field of process control, in particular to an injection molding process optimization method and device, computer equipment and a storage medium, and the method comprises the following steps: obtaining stress signals of four tie bars of an injection molding machine, calculating a total mold locking force, and preprocessing the stress signals through temperature compensation and moving average filtering; real-time mold cavity pressure is calculated based on a mold filling stage linear model, a pressure maintaining stage quadratic function model and a cooling stage exponential attenuation model triggered by an injection molding machine control signal; generating a standard curve template with a confidence interval according to the characteristic parameters of the qualified sample, and dynamically updating the standard curve template; and comparing the current pressure curve with a standard template output quality judgment result in real time, and triggering automatic parameter adjustment to form closed-loop control. The device and the method have the effect of solving the problems of high cost, poor compatibility and difficulty in maintenance when the pressure of the die cavity is directly measured.

The invention relates to the technical field of intelligent manufacturing equipment, in particular to a mold cavity pressure homogenization precision control method and system based on a two-way closed loop, and the method comprises the following steps: based on an injection mold cavity, completing the sudden change recognition and compensation of pressure data, the dynamic switching of a master closed loop path and a slave closed loop path, and the discrimination of the synchronous adjustment state of a driver in sequence; and setting a gain adjustment action in stages, and implementing closed-loop correction according to a feedback trend to obtain a dynamic offset correction amount. According to the method, continuous correction of the pressure state is achieved by correlating multi-point pressure collection, judging the pressure sudden change position in the cavity in real time and dynamically compensating local abnormal data, the motion state of the propelling device is combined, pressure adjusting strategies are switched according to different process stages, a linkage gain adjusting and controlling mode is adopted, dynamic adjustment of pressure distribution keeps high collaboration, and the control effect is good. Periodic trend closed-loop correction is carried out on feedback signals in the driving response stage, and forming errors and product defects caused by abnormal local pressure are remarkably reduced.

The invention discloses an injection molding process parameter initial setting method based on cavity pressure curve characteristic analysis, and relates to the field of injection molding process parameter setting. According to the method, pressure curve data in a mold cavity and a product appearance detection result are collected in real time in the mold testing process, key feature point information including a pressure building starting point, a pressure sudden change point, a V / P switching inflection point, a pressure maintaining platform interval and a cooling end point is recognized, and association rules of technological parameters and quality defects are established; and key parameters such as injection speed, injection pressure, dwell pressure, dwell time, cooling time and the like are sequentially adjusted, so that systematic setting of initial process conditions is realized. The method has the advantages of being high in data driving performance, clear in debugging process, high in interpretability and the like, the injection molding parameter adjusting efficiency can be effectively improved, dependence on historical sample data or complex modeling is avoided, the method is suitable for mold testing scenes of products of different structures and multiple types, the mold testing period is short, the trial and error cost is low, and good engineering practicability and application and popularization value are achieved.

The invention belongs to the technical field of ABS (Acrylonitrile Butadiene Styrene) molding, and discloses an ABS ultrathin wall injection molding process which comprises the following steps: S1, material modification; s2, configuring equipment and a mold; s3, injection molding is executed; s4, demolding and process control; s5, post-processing and detecting; the material modification comprises the steps of preparing a high-flowability ABS base material and carrying out drying pretreatment. According to the method, ordered arrangement of molecular chains is kept in the high-speed filling process, weld line weakening and internal stress concentration are effectively restrained, and the surface thickness uniformity of the ultrathin wall meets the optical-grade requirement. Dynamic pressure closed-loop control is combined with a vacuum auxiliary exhaust mechanism, real-time matching of the melt front temperature and the cavity pressure is achieved, the defect of short injection or surface flow marks caused by air trapping in a traditional process is eliminated, and the distribution error of a mold thermal field is reduced to the micron order through cooperation of partition mold temperature control and a quick response heating element; the dimensional stability and assembly precision of the complex thin-wall structure are guaranteed, and meanwhile energy consumption of the cooling period is reduced.

The invention relates to the technical field of composite material forming, in particular to a pultrusion process and system based on resin-based constant-pressure control, and the pultrusion process comprises the following steps: fiber guiding gum dipping: selecting a normal-pressure mode or a closed mode; collecting die cavity pressure data and pultrusion force data in real time; the pressure data of the mold cavity are compared with a set interval, and the glue injection flow and / or the pultrusion speed are / is adjusted; and comparing pultrusion data with a set interval, reversely optimizing the pressure of the mold cavity based on tension feedback, and reducing the stress of the product, and the method has the following beneficial effects that the resin supply or pultrusion speed is adjusted in real time and the pressure of the mold cavity is kept constant by combining a dual-mode resin impregnation system (normal-pressure impregnation / closed glue injection) with a mold cavity pressure closed-loop control technology. A pressure-tension cooperative control model is innovatively provided, and internal stress distribution of the product is optimized. The embodiment verifies that the pultrusion force can be reduced by more than 15%, the bubble rate can be reduced by more than 30%, and the mechanical property and the production stability of the product can be obviously improved.

The invention discloses a new media integrated interactive display device, which belongs to a new media industrial display device, and comprises an interactive module and a convex groove body, and a middle plate assembly is arranged in an inner cavity of the convex groove body; the middle plate assembly comprises a middle plate body integrally formed with the convex groove body, and a plurality of rows of water discharging thin openings are evenly formed in the top of the middle plate body. An intra-cavity pressure-bearing seat is arranged in the hollow cavity in a sealed and sliding mode, and a combination unit communicated with the hollow cavity is arranged in the preassembling opening. After the electric water pump pumps a water source into the liquid cavity, the water source continuously flows out from the water outlet thin opening, a layer of lubricating water film can be formed between the scraper blade and the middle plate assembly, and the frictional contact condition between coal and the surface of the groove middle plate body 201 is simulated through the water film flowing on the surface of the middle plate body 201 when the reversed loader runs. The authenticity and immersion of experiences of participants are enhanced, and in addition, the middle plate assembly can sense the abrasion depth of the middle plate assembly in the running process of the reversed loader.

The invention relates to the technical field of drilling tool dismounting and mounting equipment in the petroleum industry, in particular to a torque control method for a punching and buckling oil cylinder applied to a driving clamp and the driving clamp, and the torque control method for the punching and buckling oil cylinder applied to the driving clamp comprises the following steps that the first extension length L1 and the second extension length L2 are obtained; calculating a first included angle alpha 1 and a first real-time force arm H1 according to the L1, pre-stored R1 and r1 and a first preset rule; according to the same rule, a second included angle alpha 2 and a second real-time force arm H2 are calculated according to L2, R2 and r2; acquiring a first rodless cavity pressure intensity P11, a second rod cavity pressure intensity P22, a first rod cavity pressure intensity P12 and a second rodless cavity pressure intensity P21; according to the parameters and the pre-stored sectional area of each cavity of the oil cylinder, the current torque M is calculated according to a second preset rule; and according to the relation between the current torque M and the preset target torque, the output torque of the first punching and buckling oil cylinder and the output torque of the second punching and buckling oil cylinder are controlled. The invention aims to solve the problems of torque overshoot and overlong screwing-on and screwing-off time in the prior art.

The invention provides a plastic mold intelligent optimization system and method based on digital twinning. The method comprises the steps that a digital twinning model integrating mold cavity geometry and an injection molding machine hydraulic device is established; time sequence data of cavity pressure and screw movement in the filling and pressure maintaining stage are used as input, and PVT characteristic parameters and melt leading edge viscosity attenuation coefficients of the polymer melt in the current production period are identified and updated on line; on the basis of the PVT characteristic parameters and the melt front edge viscosity attenuation coefficient, predicting and generating a dwell pressure curve required for achieving a predefined cavity pressure balance curve in the next period; in the pressure maintaining stage of the next production cycle, the amplitude of the pressure maintaining pressure curve is adjusted according to the dynamic deviation of the cavity pressure detected in real time and the cavity pressure balance curve, a compensation control signal is output to an injection molding machine executing mechanism, and self-adaptive closed-loop adjustment of the cavity pressure is achieved. Based on the above scheme, feedforward optimization based on material characteristics and feedback control of AI disturbance can be realized.

The invention discloses a construction method and an evaluation method for a vacuum degradation model of a vacuum packaging MEMS device cavity considering various failure mechanisms. The model construction method comprises the following steps: (1) vacuum degree characterization: characterizing the vacuum degree of the cavity by using a quality factor; (2) vacuum degeneration mathematical model modeling: a, calculating the number of gas molecules released in the cavity, and obtaining a first vacuum degeneration mathematical model caused by gas release in the cavity; b, the number of gas molecules leaked from the outside in the cavity is calculated, and a second vacuum degradation mathematical model caused by external leakage in the cavity is obtained; and c, the first vacuum degeneration mathematical model and the second vacuum degeneration mathematical model are used for obtaining a vacuum degree degeneration model in the cavity based on the relationship between the total number of gas molecules in the cavity and the air pressure of the cavity. On the basis of the constructed vacuum degree degradation model, the invention also provides a method for evaluating the reliability of the vacuum degradation of the vacuum packaging MEMS device, and the reliability prediction of the vacuum degree degradation of the vacuum packaging MEMS device can be realized.

The invention relates to a quantitative measurement system and method for mechanical properties of soft tissue and electronic equipment, and the system is characterized in that a pre-negative pressure cavity is in preset negative pressure, and a direct negative pressure cavity is in sealed contact with the measured soft tissue; the first control part loads and maintains target negative pressure to the direct negative pressure chamber according to a preset time sequence; the second control piece is used for releasing pressure and resetting the direct negative pressure chamber; the pressure acquisition part acquires the actual pressure in the cavity; the displacement acquisition part acquires the displacement of the tested soft tissue at the opening of the direct negative pressure chamber; the state detection piece detects the actual state between the direct negative pressure chamber and the detected soft tissue; the control part generates a control instruction and generates soft tissue mechanical property quantitative measurement data in combination with actual intracavity pressure and displacement. Therefore, the problems of high maintenance cost, strong operation dependence, poor repeatability, difficulty in programming scheduling of key test conditions, poor flexibility and configurability and the like caused by large volume of the gas circuit and the detection unit in the related technology are solved.

An insulation compaction device includes an insulating structure of an appliance and has an insulating media disposed within an insulating cavity. An operable piston selectively engages the insulating structure and operates to define a selected cavity volume of the insulating cavity and a selected insulation density of the insulating media. A valve is attached to the insulating structure and in a passive state releases gas from the insulating cavity to the exterior during operation of the operable piston. Selective operation of a pump mechanism places the valve in an active state to extract gas from the insulating cavity and define a cavity pressure of the insulating cavity that is less than an equalized pressure. The operable piston and the pump mechanism are at least one of sequentially and simultaneously operable to define a selected piston chamber environment defined by the selected cavity volume and the cavity pressure.

The utility model discloses a shoe with a buffer structure, and relates to the technical field of shoe bodies. The shoe with the buffer structure comprises a shoe sole and the buffer structure arranged in the shoe sole, and at least one cavity capable of being filled with fluid is formed in the buffer structure; the cavity is at least partially provided with an open structure before being filled, a closed structure is formed after the cavity is filled with fluid through the open structure, and the volume of the cavity does not exceed the total volume of the buffer structure. According to the utility model, by filling different fluids and matching with the intelligent supplement module, the real-time dynamic adjustment of the buffer characteristic is realized. The supplementing module is matched with the micro electric pump and the Bluetooth communication module through the sensor to form a closed-loop control system, the pressure of the air cavity is monitored in real time through the air pressure sensor, and the micro pump is controlled to supplement air through the control module.

This invention proposes an integrated vacuum pumping system for the exterior of a vacuum evaporation machine, comprising a coarse pumping pipe and a fine pumping pipe. A first three-way pipe and the fine pumping pipe are connected by a telescopic motor that drives the valve cover to rise and fall, enabling rapid switching between the coarse and fine pumping lines and avoiding vacuum fluctuations. Under the precise pressure control of the telescopic motor, the valve cover maintains uniform contact pressure on the sealing surface. The transition pipe directly connects the coarse and fine pumping pipes, eliminating flow channel redundancy in traditional multi-valve systems and reducing gas flow resistance. The telescopic motor is linked with a vacuum sensor to automatically switch the pumping mode based on the cavity pressure threshold, avoiding errors caused by manual intervention. The integrated three-way pipe reduces external connecting components, shrinks the equipment size, and lowers manufacturing costs and maintenance complexity.

A box suction mold comprises a mold bottom plate, a lower pressing frame, a mold core frame, a main control box connected with the mold bottom plate, a counter connected with the mold bottom plate and the lower pressing frame, a plurality of temperature sensors and a plurality of in-cavity pressure sensors laid on the mold core frame, and a main control unit connected with the temperature sensors and the in-cavity pressure sensors. The cavity external pressure sensor is used for detecting the pressure outside the mold cavity; the counting box is connected with the bottom plate; and a counting unit is arranged in the counting box. According to the technical scheme provided by the utility model, real-time monitoring of parameters such as temperature, pressure and the like in the plastic uptake forming process is realized by applying the sensor, the energy consumption can be reduced, the product quality and the production efficiency can be improved, and the operation safety and the equipment reliability can be improved.

This invention relates to the field of dual-cavity pressure sensors, and discloses a dual-cavity pressure sensor with a flexible corrugated diaphragm, comprising: a corrugated diaphragm, a pressure-sensing layer, and a substrate; the corrugated diaphragm is disposed on the upper side of the pressure-sensing layer; the pressure-sensing layer is sealed on the upper side of the substrate; a first pressure-sensing cavity and a second pressure-sensing cavity are spaced apart on the side of the pressure-sensing layer near the substrate; deformation sensing components are disposed inside and / or outside the first and second pressure-sensing cavities; the deformation sensing components include a resistance sensing part or a capacitance sensing part; the resistance sensing part is disposed inside the corrugated diaphragm; the capacitance sensing part is disposed inside the first and second pressure-sensing cavities. The flexible corrugated diaphragm effectively alleviates the fatigue fracture problem caused by stress concentration in the pressure-sensing layer, extending the service life of the sensor; the combined resistance and capacitance measurement improves detection sensitivity.

The invention provides a method and device for evaluating the atomization performance of a pressure nozzle, and relates to the technical field of atomization performance test.The method comprises the steps that firstly, the total volume and total kinetic energy of fog drops are determined when the pressure nozzle sprays mist, and the total kinetic energy of the fog drops is calculated according to the inlet flow speed of liquid in a pressure nozzle pipeline and the nozzle flow speed of the liquid at a nozzle; the cavity pressure of the pressure nozzle is calculated, the initial energy of the pressure nozzle under the weighted volume is calculated by combining the total volume of the fog drops, and the ratio of the total kinetic energy of the fog drops to the initial energy serves as the atomization performance index of the pressure nozzle. The method is used for solving the problems that in the prior art, a method for evaluating the atomization performance of the pressure nozzle is insufficient in universality, and the atomization performance of the pressure nozzle is difficult to directly and accurately evaluate, and a new technical method is provided for performance evaluation and model selection of the pressure nozzle.

The invention belongs to the technical field of aviation, and particularly relates to an engine bearing cavity ventilation system simulation calculation method considering pump suction performance, which is based on a flow simulation calculation platform and adopts elements such as a cylindrical pipeline, an elbow, a transition joint, a throttling hole, a flow source, a pressure source, a controller and a signal collector. Components such as a pipeline, a sealing device, a bearing cavity and a lubricating oil pump set are represented, an engine bearing cavity ventilation system simulation calculation model considering pump suction characteristics is constructed, parameters such as pressure and ventilation quantity of the bearing cavity can be accurately calculated, and the influence mechanism of the parameters such as structures, flow, pressure and throttling hole diameters of different components on the ventilation system is revealed. According to the scheme, modular elements are adopted, the system layout and related parameters can be conveniently and rapidly adjusted, the design accuracy and calculation efficiency of the bearing cavity scheme are improved, and the high cost generated by redeveloping a new ventilation system is reduced.

The invention discloses a composite material forming device and method for stable-pressure resin injection and a product, the composite material forming device for stable-pressure resin injection comprises a press system, a resin injection system and a mold, and further comprises a mold cavity pressure dynamic adjusting system; the die cavity pressure dynamic adjusting system comprises a controller, a die cavity pressure sensor and a die position sensing device; the die cavity pressure sensor is used for monitoring the pressure in the die cavity in real time and feeding back a pressure value; the mold position sensing device is used for monitoring the height of a mold cavity of the mold in real time and feeding back a height value; the controller is used for receiving the pressure value and the height value; the controller is further in communication connection with the press system and controls the press system, when the pressure of the die cavity is larger than the preset standard pressure, a control instruction is output to the press system, the press system dynamically adjusts the position of the upper die and / or the lower die so as to adjust the height of the die cavity in real time, and therefore the pressure in the die cavity is stabilized within the preset target pressure range.

The utility model discloses a fireproof mud extrusion molding equipment, which specifically relates to the field of fireproof mud processing technology, including a cylinder for accommodating fireproof mud and a pressure piston inside the cylinder for extrusion molding, the pressure piston moves inside the cylinder to extrude the fireproof mud, a detachable rear end cover is provided at the rear end of the cylinder, a pressure pipe is connected to the bottom of the cylinder between the rear end cover and the pressure piston, the other end of the pressure pipe is connected to an air pump, the air pump adjusts the air pressure inside the cylinder through the pressure pipe to push the pressure piston to move. The utility model realizes fireproof mud extrusion molding by pushing the pressure piston through the pressure change of the inner cavity of the cylinder, so that the overall volume of the entire extrusion molding equipment is reduced, the weight of the equipment is reduced, and it is convenient to carry and use. At the same time, the extrusion molding can be completed without long-distance spiral mixing, which improves the efficiency of fireproof mud mixing molding.