35 results about "Maximum pressure" patented technology

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.

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 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.

This invention provides a method and apparatus for detecting the reuse of centrifuge tubes in ultra-high-speed centrifuges, comprising the following steps: S1, pressurizing and filling a medium into a new centrifuge tube, and detecting the diameter deformation of the centrifuge tube online; S2, using the maximum pressure that the centrifuge tube can withstand to return to its initial diameter as the yield limit pressure value; S3, replacing the centrifuge tube to be reused, pressurizing and filling the centrifuge tube to be reused with a medium, controlling the reuse pressure value at 75%~95% of the yield limit pressure value; S4, detecting the diameter deformation of the centrifuge tube to be reused online; S5, selecting the centrifuge tube that can return to its initial diameter as the reuse centrifuge tube. This invention can detect centrifuge tubes and determine whether they can be safely reused, significantly reducing experimental costs. It can be used to detect whether replacement centrifuge tubes meet the application requirements of ultra-high-speed centrifuges. It prevents substandard centrifuge tubes from entering the ultra-high-speed centrifuge, causing equipment damage or even sample leakage.

This invention discloses an intelligent crimping pressure monitoring system and method. The system includes a crimping machine, a pressure sensor, a data acquisition unit, and a data processing server. The pressure sensor collects pressure signals from the crimping mold in the crimping machine in real time. The data acquisition unit collects the pressure signals output by the pressure sensor during the crimping process at a high sampling rate and processes them to obtain the maximum pressure value. The data processing server acquires equipment information, current production order information, and the corresponding pressure standard range. It generates an alarm control signal when the maximum pressure value exceeds the pressure standard range, or generates crimping data when the maximum pressure value does not exceed the pressure standard range. This invention, by monitoring the maximum pressure value of the crimping machine in real time and automatically comparing it with the pressure standard range, can achieve abnormal alarms, facilitate timely detection of products with unqualified crimping pressure, ensure product quality, and enable quality traceability through crimping data.

This invention provides a method and apparatus for measuring the dew point pressure of shale condensate gas, belonging to the field of natural gas extraction technology. The method includes: raising the temperature of a core holder to a preset temperature; injecting condensate gas into the core holder to a first preset pressure; after a preset time, reducing the pressure of the core holder to a second preset pressure according to a first preset change amount, while simultaneously acquiring the acoustic transit time of the core under different pressures; determining the dew point pressure range of shale condensate gas based on the acquired acoustic transit time; injecting condensate gas into the core holder to the maximum pressure value within the dew point pressure range; after a preset time, reducing the pressure of the core holder to the minimum pressure value within the dew point pressure range according to a second preset change amount, while simultaneously acquiring the acoustic transit time of the core under different pressures; and determining the dew point pressure of the shale condensate gas based on the newly acquired acoustic transit time. This invention is simple to operate, provides accurate measurement results, and can provide a technical basis for the efficient development of shale condensate gas reservoirs.

The present invention provides a base 10 for a pumping device, the base including a suction connector 13 and a pressure connector 14 to connect the suction and pressure of the pumping device to a first tubular element 18 and a second tubular element 19, respectively, the first and second tubular elements protruding outward from the base 10 for connection to a hydraulic system. The suction connector 13 includes a pressure sensor 40. The base may provide a minimum pressure threshold and / or a maximum pressure threshold, which can disable the pumping device when the minimum pressure threshold and / or maximum pressure threshold are exceeded; a free slot 43 to accommodate an integrated sensor; and a protective housing 41 to accommodate a PCB assembly controlling the pumping device.

The application discloses an auxiliary safety hydraulic system for an industrial vehicle actuator locking function, comprising a hydraulic oil pump, a multi-way reversing valve, a rotary motor, an inclination oil cylinder, a lifting oil cylinder, a steering oil cylinder and an oil tank, and realizes the on-off of a steering priority valve and a T port through a two-way unloading valve and a solenoid valve, realizes the inlet pressure cut-off of a lifting valve, an inclination valve and a rotary valve, controls the locking state of the lifting oil cylinder through a lowering oil path setting a lowering locking valve and a solenoid valve, realizes the inclination and rotation maximum flow control through the pressure compensator setting at the inlet of the inclination valve and the rotary valve, realizes the maximum pressure individual control of lifting and other actions through two overflow valves with different spring cavity pressures of the two-way flow valve, realizes the inclination oil cylinder locking and speed fast-slow adjustment through the forward inclination locking valve and the inclination speed regulating valve setting at the inclination oil path, and realizes the safety control of the rotary action through the direction cut-off solenoid valve setting at the rotary oil path.

The application relates to a ball hinge wear test method and device and relates to the technical field of part testing tools, which comprises the following steps: acquiring a current machining number and a current wear gap value; acquiring a current wear number and pressure distribution information; extracting a pressure number and a number pressure value corresponding to the pressure number from the pressure distribution information; sorting the number pressure value to obtain a maximum pressure value and a minimum pressure value; calculating a maximum pressure difference value according to the maximum pressure value and the minimum pressure value; generating wear detection information according to the current machining number and the current wear number, and outputting the wear detection information; obtaining an abnormal pressure area according to a pressure number corresponding to the maximum pressure value; generating pressure abnormal information according to the abnormal pressure area and the maximum pressure value, and outputting the pressure abnormal information. The application has the effect of improving the accuracy of ball hinge wear test.

The application discloses a forming method and device for a large-diameter thin-wall bending type part with a small fillet, and steps are as follows: blank preparation, welding a conical pipe after coiling and cutting the excess part; conical pipe liquid-filling pressure forming, putting the conical pipe blank into a first sequence lower die and performing liquid-filling pressure forming; pre-expansion, performing pressure after a second sequence die is closed; cutting, cutting the large end of the second sequence pre-formed part; final forming, putting the roughly cut part into the second sequence lower die, sticking an intermediate object to the small fillet on the inner side of the part by butter, then performing liquid-filling pressure in a rubber bag assembly, making the rubber bag deform under stress, and the intermediate object is squeezed into the small fillet under the action of force, so that the small fillet is completely attached to a die tire, the maximum pressure of expansion lasts for 15 seconds, the part is taken out after pressure relief and die opening, and fine cutting is performed, so that a high-precision part is obtained. The application is used for solving the problem of integrated forming precision of the large-diameter thin-wall bending type part with the small fillet, and is suitable for metal materials and non-metal materials for thin-wall part forming.

The automobile instrument pointer pressing needle detection method belongs to the field of pneumatic pressure pointer. The existing pressing needle detection method has the problems of low accuracy of maximum pressure value acquisition, inability to accurately determine whether the pressing needle process is abnormal, and inability to accurately determine whether the automobile instrument is damaged after pressing. The present application first obtains the demarcation time by using the first pressure curve, divides the second pressure curve at the demarcation time, forms the joint stage and the pressing stage, obtains the maximum pressure value of each stage, and performs abnormality judgment and instrument damage judgment. The present application is mainly used for detecting the pressing needle process of the automobile instrument pointer.

The present invention provides a base 10 for pumping devices, comprising a suction connector 13 and a pressure connector 14 for connecting the suction and pressure of said pumping device, respectively, to a first tubular element 18 and to a second tubular element 19, which project outward from the base 10 to be connected to a hydraulic system. The suction connector 13 comprises a pressure sensor 40. The base may provide a minimum and / or maximum pressure threshold beyond which the pumping device may be disabled, a free slot 43 to accommodate an integrated sensor, and a protective shell 41 to house a PCB component that controls the pumping device.

The MPC combustion control method for marine high-pressure common rail diesel engines based on physical information neural networks belongs to the field of marine high-pressure common rail diesel engine control. It solves the problems of neglecting the physical consistency between the model and the actual engine and poor model generalization ability caused by simply relying on data-driven methods. The method includes: keeping the combustion midpoint constant, acquiring in-cylinder pressure, maximum in-cylinder pressure rise rate, indicated thermal efficiency, and emission data for different pre-injection fuel ratios and pre-main injection timing intervals; calculating the cyclic variation of the diesel engine's average indicated pressure, filtering data, and calculating the cumulative heat release and combustion midpoint; obtaining the influence law of relevant in-cylinder combustion characterization parameters of the diesel engine, determining the crankshaft angle, pre-injection fuel ratio, pre-main injection interval boundary, and maximum cylinder pressure rise rate upper limit corresponding to the pre-injection timing; constructing a diesel engine in-cylinder combustion prediction output model and MPC controller; updating control parameters and combustion state data to achieve closed-loop control. It has applications in energy conservation and emission reduction.

This invention discloses a control method and control system for an air compressor, as well as a locomotive. The control method includes: acquiring the total air cylinder pressure value P generated by a pressure transmitter; calculating a first pressure drop rate k of the total air cylinder pressure value P within a first preset time when P ≥ y; where y is a preset maximum pressure limit value; controlling the operating mode of the power switch and the unloading valve according to the first pressure drop rate k, a preset shutdown threshold a, and a preset air charging rate L; the operating mode includes a coasting mode, in which the power switch is on and the unloading valve is closed. This invention avoids frequent start-up and shutdown of the air compressor, reduces the time consumption of shutdown and start-up, thereby improving air charging efficiency. It also helps to improve the stability of the input power supply voltage, extend the service life and operational reliability of the inverter and air compressor unit, and reduce the total life cycle cost.

Disclosed is a method of testing a leak rate of a reactor containment building, the method including: a division step of dividing the reactor containment building into an upper containment area and a lower containment area by a spectacle flange; a measurement step of measuring the leak rate of the containment building after pressurizing the inside of the containment building at a maximum pressure; and an identification step of identifying whether the leak rate measured in the measurement step satisfies an allowable standard for the leak rate of the containment building.

This invention discloses a method and electronic device for estimating the thermal loss angle of an engine. The method includes the following steps: Step 1: Obtaining cylinder pressure curves; Step 2: Obtaining the crankshaft rotation angle coordinates and thermal loss angle of the maximum pressure point for each cylinder pressure curve; Step 3: Calculating the zero heat transfer phase difference vector for each cylinder pressure curve; Step 4: Constructing the rotation angle difference vector for each cylinder pressure curve; Step 5: Establishing the thermal loss angle θ. i and the angle difference vector Ω i Step 6: Calculate the estimated thermal loss angle based on the functional relationship f between the thermal loss angle and the rotation angle difference vector. This invention provides a convenient method for top dead center correction during engine production lines, inspection, and maintenance.

This application discloses a method for continuously casting high-alloy steel, comprising: reducing the specific water content of the high-alloy steel continuously cast billet at the casting speed during billet production; setting the roll gap of the driven roller in the fan-shaped section after the light down-pressing section to a parallel roll gap or an open roll gap, while keeping the reduction amount of the light down-pressing section unchanged; and setting the maximum pressure of the first hydraulic cylinder in the fan-shaped section after the light down-pressing section to below 160 bar. By reducing the specific water content of the high-alloy steel continuously cast billet at each casting speed during production, the cooling intensity of the continuously cast billet is reduced, thereby increasing the temperature of the continuously cast billet and reducing the strength of the billet shell and the continuously cast billet; by reducing the total reduction amount of the roll gap in the fan-shaped section and the maximum pressure of the first hydraulic cylinder, the normal pressure of the fan-shaped section on the billet shell and the continuously cast billet is reduced, thereby reducing the average torque of the drive roller; solving the problem of the continuously cast billet being unable to be drawn during the production of high-alloy steel continuously cast billets, reducing the occurrence rate of billet being unable to be drawn to 0 times / heat of molten steel, and increasing the service life of the fan-shaped section to more than 6500 heats of molten steel.

This invention provides an adjustable wrench, comprising a ring-shaped wrench head, multiple sliders, a handle, and a switching assembly. The ring-shaped wrench head has a first annular cavity and a second annular cavity spaced apart internally, and multiple receiving grooves arranged around its center. Each receiving groove has two ends connected to the first and second annular cavities, respectively. Multiple sliders are located within the multiple receiving grooves, with one end being a mating part that slides smoothly with the ring-shaped wrench head, having a degree of freedom to slide radially along the ring-shaped wrench head. The other end is a snap-fit ​​part that protrudes from the inner ring of the ring-shaped wrench head, and has a protrusion on its lower side. One end of the handle is connected to the ring-shaped wrench head, and it has a high-pressure chamber and a normal-pressure chamber internally. It is equipped with an adjustment assembly connected to the high-pressure chamber for adjusting its volume, and a pressure-limiting assembly for limiting the maximum pressure within the high-pressure chamber. The switching assembly is connected to the handle and is used to control the communication between the high-pressure chamber and the normal-pressure chamber and either the first or second annular cavity.

This application provides a method for predicting annular pressure in oil and gas well production technology. The method includes a wellbore structure consisting of, from the inside out, layers of tubing, production casing, technical casing, surface casing, and cementing sheath. An annular protective fluid A is filled between the tubing and production casing, and an annular protective fluid B is filled between the production casing and technical casing. A packer is located between the tubing and production casing. The method includes: calculating and recording the ultimate pressure at the time of tubing failure; recording the ultimate pressure at the time of production casing rupture; comparing and analyzing the two pressures, and selecting the minimum value as the maximum annular pressure. Predicting the maximum annular pressure provides a reliable basis for safe well operation and design.

The application discloses a mining stop valve pressure testing device, relates to the technical field of stop valve testing, and comprises a mounting table, a measuring cavity is arranged in the mounting table, a stop valve placing table is arranged in the measuring cavity, a measuring plate is slidably arranged on the mounting table, a pressure display piece is arranged on the measuring plate, the position of the measuring plate corresponds to that of the stop valve placing table, and a linear driving piece for driving the measuring plate to move towards the stop valve placing table is arranged on the mounting table; the measuring plate and the force transmission plate are extruded, the pressure sensor on the measuring plate is stressed, the pressure between the two entity plates is detected, the accuracy of pressure detection is improved, the pressure data of the pressure sensor is transmitted to a display panel to be displayed, the pressure borne by the stop valve can be displayed in real time, the maximum pressure that can be borne by the stop valve is tested, and the method is simple and convenient.

A test device for an injection nozzle of a nuclear power plant emergency generator that operates in an emergency situation of nuclear power generation includes a support table, a test body slidably installed on the support table and configured to slide between an inspection position and a storage position, a hydraulic pump arranged within the test body and configured to operate by pneumatic pressure, a first pneumatic line connecting an air inlet portion to the hydraulic pump and configured to supply air at a predetermined pressure to the hydraulic pump, a relief valve arranged on the first pneumatic line and configured to control a maximum pressure of the air, a hydraulic line configured to supply oil supplied by the hydraulic pump to an injection nozzle, and an oil pressure measuring portion configured to measure a pressure of oil flowing within the hydraulic line, wherein the oil pressure measuring portion comprises a digital display portion configured to measure a real-time pressure of the oil and digitally display a peak value of the oil pressure supplied to the injection nozzle.

This invention discloses an anti-torsion rotation locking system and control method for drilling, grouting, and anchoring equipment on high slopes. The system includes a rotation support, a rotation drive mechanism, a locking structure, and a hydraulic control system. The locking structure consists of multiple locking cylinders evenly arranged along the circumference of the rotation center and an annular friction plate disposed on the bottom plate of the upper assembly. The cylinders output axial clamping force to form an annular friction braking pair to provide braking torque to resist the reverse torque of rotation. The hydraulic control system includes a hydraulic pump, an accumulator, an overflow valve, and an electromagnetic control valve group. The locking pressure is established by controlling the cylinders, and the pressure is maintained by the accumulator after the power supply is stopped. When the cylinder pressure is detected to be lower than a set threshold or the upper assembly shows a rotational tendency, the accumulator is controlled to replenish the cylinder pressure through throttling damping to achieve closed-loop compensation of the locking force. At the same time, the overflow valve limits the maximum system pressure to prevent structural overload.

The application relates to a fault diagnosis method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: in the case that the hydraulic retarder is in the opening working process at the current moment, acquiring a current maximum pressure value, an actual rising duration, a rated maximum pressure value and a theoretical rising duration; determining whether the one-way valve is in a fault state according to the current maximum pressure value, the actual rising duration, the rated maximum pressure value and the theoretical rising duration; in the case that the hydraulic retarder is in the exiting working process at the current moment, acquiring a plurality of first pressure values, and determining whether the one-way valve is in the fault state according to the plurality of first pressure values; in the case that the one-way valve is in the fault state, determining the fault condition of the one-way valve, and displaying the fault condition of the one-way valve in a fault display area of an instrument panel. The method can identify the one-way valve fault point without disassembling the hydraulic retarder.

The application discloses a glass bottle body pressure detection device and a use method thereof, and relates to the field of glass bottle pressure detection. The glass bottle body pressure detection device and the use method thereof comprise a base, a vertical sliding rail is arranged on the base, and a controller is arranged on the front of the vertical sliding rail. The glass bottle body pressure detection device and the use method thereof are characterized in that the temperature sensor is directly opposite the glass bottle body, the surface temperature of the glass bottle body is collected in real time and transmitted to the controller, the humidity sensor synchronously monitors the environmental humidity and transmits the data to the controller, the controller determines the temperature and humidity values, when the pressure in the bottle reaches a preset detection threshold, the system maintains a constant gas injection rate and a pressure maintaining time, then gradually releases the pressure, and records the minimum pressure value in the pressure maintaining stage; the actual pressure drop is determined by the difference between the target pressure and the minimum pressure, if the actual pressure drop is less than or equal to the dynamic maximum pressure drop value, the glass bottle is determined to be qualified in the air tightness; otherwise, the glass bottle is determined to be unqualified.

This invention discloses a method and device for preventing strip deviation in a pickling and straightening mill. Based on the wrap angle between the strip and each pickling and straightening squeeze roll, the unit tension exerted by each pickling and straightening squeeze roll on the strip is determined. The roll shape of each pickling and straightening squeeze roll in the pickling and straightening mill is set as a convex roll, with the diameter of the roll body at both ends being smaller than the diameter of the middle roll body. The pressure of the upper and lower pickling and straightening squeeze rolls when they are opened is set as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening squeeze rolls. Thus, by setting the unit tension of each pickling and straightening squeeze roll and optimizing the roll shape, strip deviation in the pickling tank is prevented, improving the overall operational stability of the mill and further reducing the failure rate of the pickling and straightening mill.

The present invention particularly relates to a control device (8) for a peristaltic pump (5) delivering a medium in a pulsating pressure cycle, the control device (8) controlling the speed of the peristaltic pump (5) in such a way as to not exceed the pressure limit (p) in the delivery line (9). Grenz Achieving maximum volumetric flow rate (Q) under these conditions max One task is to guide the actual pressure in the output line (9) as close as possible to the pressure limit (p). Grenz Or minimize the distance to it. To solve this problem, a method based at least on the pressure (p) in the output line (9) is proposed. ist To calculate the predicted pressure (p) for each pressure cycle (P) within the expected maximum pressure of the pressure cycle (P). futur And by using this predicted pressure, the maximum volumetric flow rate (Q) is limited. max This causes the pressure (p) in the output pipeline (9) to increase. ist ) does not exceed the pressure limit (p) in the pressure cycle (P) Grenz This invention also relates to related aspects.

The invention relates to a method for parameter setting of a control system of a pressure supply system of a hydraulic system, wherein the pressure supply system has a motor (4) and a hydraulic machine (2) which are controlled by a manipulated variable, wherein the control (160) is implemented by a control algorithm which determines manipulated values ​​for the manipulated variable from setpoint values ​​for a variable to be controlled, wherein the control algorithm is parameterized by one or more parameters which are adjustable during operation.The procedure comprises: performing (110) during the operation of the hydraulic system an estimation procedure based on a physical model to determine an estimate for at least one characteristic of the hydraulic system, wherein the at least one characteristic includes a hydraulic capacity of the hydraulic system; determining (120) a setting time constant equal to or greater than a target time constant by which a maximum pressure build-up rate of the hydraulic system is achieved, which is determined by the estimate for the hydraulic capacity and a maximum volume 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 by a respective function dependent on the setting time constant (130, 140).

The present invention provides a base 10 for pumping devices, comprising a suction connector 13 and a pressure connector 14 for connecting the suction and pressure of said pumping device, respectively, to a first tubular element 18 and to a second tubular element 19, which project outward from the base 10 to be connected to a hydraulic system. The suction connector 13 comprises a pressure sensor 40. The base may provide a minimum and / or maximum pressure threshold beyond which the pumping device may be disabled, a free slot 43 to accommodate an integrated sensor, and a protective shell 41 to house a PCB component that controls the pumping device.

Hydraulic valve unit (44) with a valve housing (78) extending along an installation axis (84), which is designed for installation and has a first and a second valve bore (60, 61) in each of which a valve body (58, 59) is movably received between two valve seats (62, 64), wherein a first high pressure can be balanced against a first low pressure via a first (58) valve body (58, 59) from first pressures acting on the valve unit (44) and a second high pressure can be balanced against a second low pressure via a second (59) valve body (58, 59) from second pressures acting on the valve unit (44), wherein the two valve bores (60, 61) extend substantially parallel to the installation axis (84), wherein a third valve body (58) extends substantially parallel to the installation axis (84) in a third valve bore (98) which extends substantially parallel to the installation axis (84) between two valve seats (112, 114). The valve body (100) is movably mounted, characterized in that itthat a maximum pressure can be selected from the first and second high pressure via the third valve body (100), wherein the first, second and third valve bores (60, 61, 98) are arranged substantially equally around the installation axis (84).