314 results about "Maximum pressure" patented technology

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 discloses a pressure controller for a water supply and drainage system and a regulation and control method, and relates to the technical field of emergency protection devices. The method comprises the following steps: acquiring monitoring data of each pressure controller; based on the monitoring data, the pressure value gradient amount of each pressure controller is obtained; obtaining an abnormal region position of the conveying pipeline based on each pressure value gradient amount; obtaining a first pressure controller based on the abnormal region position; and the first pressure controller is adjusted, so that the maximum pressure value of the abnormal area position is smaller than or equal to a standard pressure threshold value. Through the arrangement of the pressure controller capable of measuring the pressure and position of the conveying pipeline, the position where turbulent flow or vortex occurs in the conveying pipeline can be determined, then the pressure of the abnormal area of the conveying pipeline is adjusted based on the corresponding pressure controller, and the situation that the abnormal area of the conveying pipeline is damaged due to the too large pressure is avoided.

The utility model provides an open-loop controlled multifunctional hydraulic pulse test bench, which comprises a storage oil tank, an oil supply pump machine, a reversing valve, a pressurizing oil cylinder and an oil supplementing overflow valve, according to the test bed, a large amount of oil flows into a system at the moment that an oil way is opened by a reversing valve, and due to the fact that an overflow valve has a lag phenomenon in response, oil pressure instantaneously generates an overshoot peak value, pressure in a pipeline rapidly rises and a pressure peak appears, then the overflow valve is conducted, the oil is guided out along the overflow valve, and the pressure in the system is reduced to the set pressure of the overflow valve; water hammer waves and rectangular waves of various waveforms and frequency bands can be generated by adjusting the diameter of a variable damping hole of the one-way throttle valve and the rotating speed of the motor, so that the hydraulic pulse test bed can form hydraulic pulse waveforms of various waveforms and frequency bands; the set pressure of the overflow valve is increased, meanwhile, the travel switch loses efficacy, and when the reversing valve is located at the right position all the time, a damage test can be conducted on the hydraulic pipeline to measure the maximum pressure value capable of being borne by a tested piece.

The invention relates to the technical field of shield tunneling machine construction, in particular to a shield tunneling machine settlement control method which comprises the steps that the maximum pressure and the minimum pressure of a shield tunneling machine in an undercrossing subway tunnel section are calculated according to the burial depth and geological data, and when the shield tunneling machine conducts tunneling, the notch pressure of an excavation face is monitored according to the maximum pressure and the minimum pressure; in the tunneling process of the underpass subway tunnel section, the tunneling speed and the unearthing amount of a shield tunneling machine are monitored, meanwhile, grouting is conducted through radial holes in a shield shell by adopting a plastic material, and a gap, caused by excavation, between a soil body and the shield shell is filled; and when the shield tunneling machine tunnels to the granite layer, slurry injection parameters are controlled. According to the scheme, the safety and reliability of the construction process can be effectively controlled, the construction settlement condition is effectively controlled, it is guaranteed that the safety of the subway tunnel and the surrounding ground is effectively guaranteed, and related potential safety hazards are eliminated.

The utility model belongs to the technical field of aluminum alloy templates, particularly relates to an aluminum alloy template with a double-layer structure, and aims to solve the problems that the pressure of a large amount of pouring cement on the aluminum alloy template is increased along with the increase of the height of a poured wall body, and particularly, the aluminum alloy template at the bottom bears the maximum pressure and is easy to damage and deform. According to the technical scheme, the formwork comprises a formwork body, a plurality of installation holes matched with bolts for installation and use are formed in the periphery of the formwork body, the installation holes are arranged at equal intervals, and aluminum plates matched with the formwork body in size are arranged in the formwork body. Two cross rods are symmetrically welded to the two ends of the inner wall of the formwork body, and the cross rods are hollow. According to the utility model, the structural stability of the template main body is integrally improved, the anti-pressure capability is improved, the impact force of a large amount of poured cement on the template main body is dealt with, the durability is improved, the recycling is facilitated, and the construction cost is reduced.

The invention discloses a marine high-pressure common rail diesel engine MPC combustion control method based on a physical informatization neural network, and belongs to the field of marine high-pressure common rail diesel engine control. The problems that physical consistency of a model and a real machine is ignored and the generalization ability of the model is poor due to the fact that only data driving is relied on are solved. The method comprises the following steps: keeping a combustion midpoint unchanged, and acquiring in-cylinder pressures, in-cylinder maximum pressure rise rates, indication heat efficiency and emission data of different pilot injection fuel ratios and pilot main injection positive time intervals; calculating the average indicated pressure circulation change of the diesel engine, screening data and calculating the accumulated heat release amount and the combustion midpoint; obtaining an influence rule of related characterization parameters of combustion in a diesel engine cylinder, and determining a crank angle corresponding to pilot injection timing, a pilot injection fuel ratio, a pilot main injection interval boundary and an upper limit of a maximum pressure rise rate of cylinder pressure; a diesel engine in-cylinder combustion prediction output model and an MPC controller are constructed; and updating control parameters and combustion state data to realize closed-loop control. The method is used in energy-saving and emission-reducing fields.

The present application relates to an air-jet type spinning device provided with a spinning starter system, in which the included spinning starter system is arranged to:-pneumatically supply an injector or venturi nozzle (36) at an initial maximum pressure pmax in order to retrieve fibres in a fibre introducer (20),-supply fibres into a spinning chamber (16) and then into a spindle (24) of the spinning chamber (16); the spinning chamber (16) is pneumatically supplied with a main nozzle (40) such that the two compressed air jets overlap each other, and the ejector or venturi nozzle (36) is gradually closed according to an average pressure gradient having an absolute value of less than 6 bar / sec. The utility model has the main advantage of improving and adjusting the starting of the air jet spinning process, which is particularly useful for yarns made of hard fibers and for reducing the fiber passing time in the spinning chamber.

The invention relates to the technical field of centrifugal pumps, and particularly discloses a high-leakproofness non-variable-capacity pump and a component thereof, the high-leakproofness non-variable-capacity pump comprises a pump shell and an impeller, the pump shell is provided with a water inlet and a water outlet, the pump shell is in a volute shape, the volute shape comprises a wide section and a narrow section, and the high-leakproofness non-variable-capacity pump further comprises a flow aiding mechanism; the flow dividing device comprises a flow dividing opening and a flow dividing sleeve which are formed in the narrow section of the pump shell, a plurality of liquid inlet holes are formed in the water inlet in a circumferential array mode, and the flow dividing opening and the liquid inlet holes are covered with the two ends of the flow dividing sleeve respectively. According to the centrifugal pump, in the operation process of the impeller, fluid is guided to enter the flow dividing sleeve along the flow dividing opening at the volute-shaped narrow section with the maximum pressure through the flow dividing sleeve, then the flow dividing sleeve supplements the fluid to the water inlet of the pump shell, the negative pressure at the water inlet is supplemented, the cavitation condition is relieved, and the service life of the whole centrifugal pump is prolonged.

The application discloses a centrifugal air compressor surge control method, system, electronic equipment and storage medium, and the centrifugal air compressor surge control method comprises the following steps: obtaining the exhaust pressure variation intensity of a centrifugal air compressor; performing classified control according to the obtained exhaust pressure variation intensity value; when it is detected that the exhaust pressure variation intensity is less than a set maximum pressure variation threshold value and greater than a set minimum pressure variation threshold value, switching the anti-surge valve to an anti-surge automatic control mode; under the anti-surge automatic control, slowly opening the anti-surge valve to introduce airflow into the atmosphere and discharge the airflow; after continuously detecting that the exhaust pressure variation intensity is less than the set minimum pressure variation threshold value and maintaining the set time, switching the anti-surge valve out of the anti-surge automatic control mode and restoring the anti-surge valve to a normal control mode; and when it is detected that the exhaust pressure variation intensity is greater than the set maximum pressure variation threshold value, switching the anti-surge valve to a surge protection mode and switching to a surge fast-opening mode. The application can improve the stability of the centrifugal air compressor.

The invention relates to a method for controlling a hydraulic system (1) for a vehicle having an electrically operated pump (2) that adjusts a system pressure, wherein, for actuating a clutch, the system pressure is controlled between a maximum pressure (p(max)) and a minimum pressure (p(min)) by means of a slave cylinder (6). In order to enable both precise and robust control of the hydraulic system (1), a pressure signal of the system pressure is filtered using different types of filters as a function of at least one operating parameter of the hydraulic system (1).

The invention relates to a powder needleless injection pressure monitoring device, which belongs to the technical field of medical instruments and comprises a pressure sensing needleless injector main body, a partition pressure reading recording display screen, a main body pressure sensor and a pressure sensing medicine tube. The powder needleless injection pressure monitoring device is provided with a medicine tube pressure intensity monitoring structure, an injector injection generation pressure sensing structure and a pressure value display structure at the same time; the pressure sensors arranged at the top of the injection push rod and the upper end of the injection piston push piece are used for accurately sensing the injection generation pressure intensity and the actual acting pressure intensity value, the real-time pressure during needleless injection is sensed and displayed, the actual pressure value of powder needleless injection can be accurately monitored, effective injection is guaranteed, and the injection efficiency is improved. The action pressure intensity verification sensor is used for sensing the actual action and the maximum pressure intensity value of the medicine powder, and the maximum pressure intensity value is compared with a numerical value detected through sensing, so that the monitoring accuracy is further guaranteed, and accurate and effective pressure-controlled injection is completed.

The invention discloses a shield tunneling machine shield tail sealing pressure monitoring method and device, and the method comprises the steps: receiving pressure data collected by a plurality of pressure sensors disposed in a shield tail sealing cavity, and obtaining the maximum pressure data and the minimum pressure data from the pressure data; the pressure sensors are anticlockwise distributed in the annular shield tail sealing cavity at equal intervals; according to the maximum pressure data and the minimum pressure data, performing normalization processing on each piece of pressure data, mapping the normalized pressure data into a preset standardization interval, and matching the pressure data with a corresponding pressure standard value; mapping the pressure standard value to a preset RGB color gradation interval, matching an RGB value corresponding to the pressure standard value, and generating a pressure cloud picture according to the RGB value; and monitoring pressure data in the shield tail sealing cavity according to the pressure cloud picture. According to the invention, the monitoring precision of the shield tail sealing pressure can be improved, and comprehensive and accurate monitoring is provided for the shield tail sealing state.

The embodiment of the invention discloses a fuel gas safety Rubik's cube and a monitoring method thereof. The Rubik's cube comprises an electromagnetic valve used for controlling opening / closing of a fuel gas pipeline, a pressure sensor used for detecting the pressure of the fuel gas pipeline and a temperature sensor used for detecting the environment temperature. When the fuel gas safety magic cube detects that the real-time pressure value P of the fuel gas pipeline exceeds the maximum pressure preset value PMAX or is smaller than the minimum pressure preset value PMIN through the pressure sensor, the electromagnetic valve is closed. According to the self-closing valve, abnormity detection is more accurate, and the abnormity can be directly improved to be within 5% compared with an existing self-closing valve 25%; the state can be updated in real time, and a user is clear at a glance; according to the invention, the security check of the gas company can be remote, and the operation cost is greatly reduced.

A trailer system with a trailer and a booster is provided. The trailer can have a hitch assembly provided at a front end of the trailer, a load bed provided behind the hitch assembly, and an axle assembly. The booster can have a connection assembly pivotally connecting the booster to a rear end of the trailer and an axle assembly. The connection assembly can include a booster hydraulic cylinder to dampen the pivoting of the booster; and an axle assembly comprising: a booster suspension frame; at least one axle; ground wheels provided on each axle; a booster suspension having at least one booster suspension air spring controlling the height of the booster suspension frame relative to the ground wheels; and a pressure regulator limiting the maximum pressure of a fluid supplied to the at least one booster suspension air spring.

The invention relates to a method for controlling a hydraulic system (1) for a motor vehicle with an electrically operated pump (2) that regulates the system pressure, wherein the system pressure is controlled between a maximum pressure and an opening pressure to actuate a clutch (17) by means of a slave cylinder (6). To prevent damage to the hydraulic system (1) due to excessive system pressure, pressure values ​​of a pressure signal of the system pressure are statistically evaluated after exceeding the maximum pressure over a predetermined measurement interval, and an error is output if a predetermined probability of the pressure values ​​exceeding the maximum pressure is reached.

It is provided a refrigeration cycle device enabling suppression of a disproportionation reaction of a working medium. A refrigeration cycle device (1) includes a control device (3) to control a refrigeration cycle circuit including a compressor (4) and allowing circulation of a working medium. The working medium contains ethylene-based fluoroolefin as a refrigerant component. The compressor (4) includes a sealed container (40) constituting a fluidic pathway for the working medium, and a compression mechanism (41) and an electric motor (42) positioned inside the sealed container (40). The control device (3) includes a drive circuit (31) to drive the electric motor (42), a detection circuit (32) to detect insulation deterioration of a winding of the electric motor (42), and a control circuit (33) having a first control mode for controlling the refrigeration cycle circuit under a first condition and a second control mode for controlling the refrigeration cycle circuit under a second condition lower in at least one of a maximum pressure or a highest temperature of the working medium at the compressor (4) than the first condition, and configured to select the second control mode when the detection circuit (32) has detected insulation deterioration of the winding of the electric motor (42).

Systems and methods for determining the impact of air resistance on the power being produced by a body motion are disclosed. In one aspect, a method includes measuring positions and orientations of a portion of the body in motion. The method further includes measuring pressure experienced by the portion of the body in motion. The motion further includes calculating a static pressure based on the measured pressures and correlated position and orientation measurements. The method further includes calculating a maximum pressure and calculating an air induced power exerted on the body in motion.

A dual-redundancy electro-hydrostatic actuator comprises a first motor pump and a second motor pump which are energy assemblies of the electro-hydrostatic actuator; the first motor pump and the second motor pump are respectively provided with a first electromagnetic isolating valve and a second electromagnetic isolating valve which are used for controlling connection and disconnection between the first motor pump and the hydraulic cylinder and between the second motor pump and the hydraulic cylinder; the energy accumulator is an oil supplementing assembly of the electro-hydrostatic actuator, provides stable pressure when the motor pump works at a high speed, and prevents the electro-hydrostatic actuator from sucking air; the one-way valve is located between the energy accumulator and the hydraulic cylinder, the energy accumulator supplies oil to the hydraulic cylinder through the one-way valve, and oil is prevented from reversely flowing back to the energy accumulator; the safety valve plays a role in limiting the maximum pressure of the electro-hydrostatic actuator, and the electro-hydrostatic actuator is prevented from being damaged due to the fact that the pressure exceeds the limit; the sensor is used for judging the working states of the first motor pump and the second motor pump of the electro-hydrostatic actuator, and after signals of the sensor are sent to the controller, the controller achieves fault diagnosis of the motor pumps and triggers updating of system state identifiers.

The invention relates to a method for setting the parameters of a control of a pressure supply system of a hydraulic system, wherein the pressure supply system has a motor (4) and a hydraulic machine (2) that are controlled with a manipulated variable, wherein the control (160) is implemented by a control algorithm, wherein the control algorithm is parameterised by one or more parameters that can be set or changed during operation, the method comprising: carrying out (110), during operation of the hydraulic system, an estimation method based on a physical model in order to determine an estimated value for at least one characteristic variable of the hydraulic system, wherein the at least one characteristic variable includes a hydraulic capacity of the hydraulic system; determining (120) an adjustment time constant as equal to or greater than a target time constant, by means of which a maximum pressure build-up rate of the hydraulic system is achieved, which is determined by the estimated value for the hydraulic capacity and a maximum volumetric flow rate of the hydraulic machine; setting (150) at least one parameter of the one or more parameters, wherein the at least one parameter is determined (130, 140) by a respective function dependent on the setting time constant.

The invention discloses a method for producing high alloy steel through continuous casting. The method comprises the steps that the specific water flow of a continuous casting billet of the high alloy steel at the pulling speed is reduced in the continuous casting billet production process; the roll gap of the driven roll in the fan-shaped section behind the light downward pressing section is set to be a parallel roll gap or an open roll gap, and the rolling reduction of the light downward pressing section is kept unchanged; and the maximum pressure of the first oil cylinder in the fan-shaped section behind the light downward pressing section is set to be 160 bar or below. The cooling strength of a continuous casting billet is reduced by reducing the specific water flow at each pulling speed of the continuous casting billet of high alloy steel in production, so that the temperature of the continuous casting billet is increased, and the strength of a billet shell and the continuous casting billet is reduced; by reducing the total rolling reduction of a fan-shaped section roll gap and the maximum pressure of a first oil cylinder, the positive pressure of the fan-shaped section on a blank shell and a continuous casting blank is reduced, and the average torque of a driving roll is reduced; the problem that the continuous casting billet cannot be pulled when the high alloy steel continuous casting billet is produced is solved, the occurrence rate that the continuous casting billet cannot be pulled is reduced to 0 time per furnace of molten steel, and the service life of the fan-shaped section is prolonged to more than 6500 furnaces of molten steel.

To provide a technique capable of estimating a pressing position even when there are a plurality of touch positions.SOLUTION: A pressing position estimation system comprises: a touch panel which detects a touch position on a detection surface and a quantity related to a pressing position on the detection surface; a pressure sensor which detects the amount of pressure applied to the detection surface; a load calculation unit which, when the pressing position is continuously being detected, continuously acquires a pressure amount from the pressure sensor, holds the pressure amount first acquired when the pressing position is continuously being detected as an initial value, holds the largest pressure amount acquired when the pressing position is continuously being detected as a maximum value, calculates a difference between the maximum value and the initial value as a load, and associates the calculated load with the pressing position; and a determination unit which determines the validity of the pressing position on the basis of the load.SELECTED DRAWING: Figure 2

The present invention discloses a method for anti-explosion experiment of castables, belonging to the technical field of refractory material testing. It includes an experimental chamber, a hatch door and several pipelines, and also includes a limiting mechanism, a pressing mechanism, a pressurizing mechanism and an adjusting mechanism. The hatch door is installed on the side wall of the experimental chamber, the limiting mechanism is hinged on the inner wall of the experimental chamber, the pressing mechanism is installed on the inner top of the experimental chamber, and a detachable heating rod is provided at the bottom of the pressing mechanism. The pressurizing mechanism is installed on the top of the experimental chamber and the pressurizing mechanism is connected to the pressing mechanism through a pipeline. The adjusting mechanism is installed at the bottom of the pressing mechanism and is located at the bottom end where the pressurizing mechanism is connected to the pressing mechanism. The present invention provides an anti-explosion experiment system and its experimental method for castables used in waste incineration, to conduct experiments on the anti-explosion performance of castables. First, it experiments whether the castables will burst when heated, and secondly, it experiments on the internal air pressure when the castables burst, so as to mark the maximum pressure range inside the castables.

The present invention relates to a method for estimating the pressure in an intake manifold of an indirect injection combustion engine, comprising: a pressure sensor measuring the pressure in the intake manifold, the intake manifold being in fluid communication with a combustion cylinder in which a piston is guided in translation and connected to a rotating crankshaft. The method comprises the following steps: measuring, by the pressure sensor, a maximum pressure value substantially corresponding to the maximum pressure in the intake manifold during a previous engine cycle; measuring, by the pressure sensor, a minimum pressure value substantially corresponding to the minimum pressure in the intake manifold during a previous engine cycle; determining, based on the crankshaft angular position and the engine speed, a precalculated average correction factor for the pressure; and estimating, based on the average correction factor and the minimum and maximum pressure values, the pressure in the intake manifold for the crankshaft angular position of the current engine cycle.

The invention provides a method for generating performance degradation data of a train air braking system. The method comprises the following steps: on the basis of a brake system of a preset model, analyzing three stages of pressure rise, maximum pressure and pressure stability of pressure change of a brake cylinder, and extracting a plurality of typical fault modes; based on an extended random process model with non-monotonicity and independent incremental property, three stages of pressure change of a brake cylinder and multiple typical fault modes are combined, and linear, nonlinear or stepped performance degradation process modeling of the train air brake system is carried out; overlapping normal distribution random noise on a performance degradation track generated by modeling, simulating a control precision error of an actual braking system, and optimizing a performance degradation process model of the train air braking system; and utilizing the train air braking system performance degradation process model to generate train air braking system performance degradation data in batches.

The present application relates to a kind of design methods of cementing annular slurry column, comprising the following steps: 1) collecting the leakage parameter of the weakest formation in the formation to be cemented, the leakage parameter of the second weakest formation, the bottom hole leakage parameter and the maximum formation pressure parameter;2) calculate the maximum pressure bearing parameter at the weakest formation when cementing operation is bumped, the maximum pressure bearing parameter at the second weakest formation when cementing operation is bumped, the maximum pressure parameter that bottom hole bears when cementing operation is bumped and the bottom hole pressure parameter when tail slurry gelatinization loses weight during cementing operation;3) according to the leakage parameter of the weakest formation, the leakage parameter of the second weakest formation, the bottom hole leakage parameter and the maximum formation pressure parameter, the maximum pressure bearing parameter at the weakest formation when cementing operation is bumped, the maximum pressure bearing parameter at the second weakest formation when cementing operation is bumped, the maximum pressure parameter that bottom hole bears when cementing operation is bumped and the bottom hole pressure parameter when tail slurry gelatinization loses weight during cementing operation, it is judged whether annular slurry column is designed reasonably.

The invention relates to a hydraulic circuit (10) for coulter pressure adjustment on an agricultural spreading machine, comprising a first line section (20) which is configured to be connected to a first coulter pressure adjustment cylinder (104) and to supply a hydraulic pressure to the first coulter pressure adjustment cylinder (104), a first pressure limiting valve (22) which is configured to limit the hydraulic pressure in the first line section (20) to a first maximum pressure, a second line section (16) which is configured to be connected to a second coulter pressure adjustment cylinder (106) and to supply a hydraulic pressure to the second coulter pressure adjustment cylinder (106), and a second pressure limiting valve (18) which is configured to limit the hydraulic pressure in the second line section (16) to a second maximum pressure.

The invention relates to the technical field of pressure reducing valves, and discloses a novel pressure reducing valve with two-stage pressure regulating precision, which comprises a pressure regulating valve assembly, a first-stage cylinder assembly and a second-stage cylinder assembly are sequentially arranged on the right side of the pressure regulating valve assembly, the pressure reducing valve assembly comprises a valve body and a valve core, and an oil supply port P, a pressure outlet A and an oil drainage port T are respectively formed in the side wall of the valve body. A pressure sensor is arranged at the pressure outlet A; the first-stage air cylinder assembly comprises a first-stage cylinder body and a first-stage piston, the second-stage air cylinder assembly comprises a second-stage cylinder body and a second-stage piston, the valve element, the first-stage piston and the second-stage piston are sequentially connected and coaxially arranged, and air sources are introduced into the left side and the right side of the first-stage piston and the left side and the right side of the second-stage piston respectively to control the valve element to move leftwards and rightwards. The oil supply port P, the pressure outlet A and the oil drainage port T are switched to be connected and disconnected, and the stress balance state of the left side and the right side of the valve element is achieved. According to the invention, the pressure can be adjusted from 0ba, the maximum pressure adjustment range is applied to 20bar, and accurate pressure adjustment can be realized in a small pressure range.

The utility model relates to the technical field of logistics parcel size measurement, and particularly discloses a parcel pressing device in logistics parcel size measurement equipment, which comprises a driving mechanism, a traction piece and a pressing plate, one end of the traction piece is fixedly connected with a movable piece on the driving mechanism, the other end of the traction piece is fixedly connected with the pressing plate, the traction piece is used for providing a pulling force for the pressing plate, and the pressing plate is fixedly connected with the driving mechanism. The pressing plate is used for pressing packages. The sliding block is driven by the driving mechanism to move, so that the rope is driven to descend, the pressing plate descends, the purpose of pressing a parcel is achieved, the rope does not apply downward pressure to the pressing plate, only upward traction force is provided, and therefore after the rope is loosened, the pressing plate does not press downwards any more, and the pressing plate does not press the parcel. The maximum pressure applied to the package does not exceed the gravity of the pressing plate all the time, so that it can be ensured that the package is not crushed, and the scheme provided by the utility model also greatly improves the measurement efficiency.

An intelligent hydraulic pressurization control method comprises the following steps that intelligent hydraulic pressurization equipment is started to enter a working state, and meanwhile real-time position parameters, valve box liquid outlet pressure parameters, hydraulic oil liquid level parameters and hydraulic oil temperature parameters in the operation process of a hydraulic cylinder piston are collected; performing pressurization control adjustment by taking the multiple types of parameters as a set; the controller is in communication connection with the display to carry out visual monitoring and adjust the injection amount in real time, and the controller is matched with the electromagnetic flowmeter installed at the outlet to automatically detect the flow and feed back the flow to the controller; the controller controls the injection operation frequency of the motor oil pump, real-time control and adjustment of the injection amount are achieved, and stable injection of equipment according to the preset displacement is guaranteed through automatic closed-loop adjustment. The controller is matched with the driver so as to transmit driving instructions to the variable hydraulic pump assembly, the hydraulic driving assembly and the heat dissipation assembly, and automatic intelligent pressurization from 0 to the maximum pressurization value is completed within the pressurization range of the device.

Disclosed is a method for depowdering a part (3) produced by additive manufacturing, the part comprising a cavity (15) to be depowdered, the cavity comprising a first opening (151), the method comprising steps of: a) pressurising the cavity by injecting a gas up to a predetermined maximum pressure through the first opening; b) suddenly releasing the pressure within the cavity by quickly switching from the predetermined maximum pressure to a purge pressure.