218 results about "Pressure controller" patented technology

The invention relates to the technical field of pressure controllers, in particular to an intelligent pressure controller which comprises a shell, a processing unit and a control unit. A threaded connector is arranged at the bottom of the shell and used for being connected to a pipeline. An elastic membrane, an ejector rod and a sensor are arranged in the shell; the elastic diaphragm ejects the ejector rod under the action of a pressure medium; a sectional cleaning mechanism is arranged in the shell; the sectional cleaning mechanism is used for cleaning dirt on the elastic membrane in a sectional manner; the first mounting ring, the first cleaning block, the second mounting ring and the second cleaning block are arranged on the two sides of the shell, dirt on the periphery of the elastic membrane is wiped by the first cleaning block, dirt in the middle of the elastic membrane is wiped by the second cleaning block, and therefore it is guaranteed that the pressure of a pressure medium in a pipeline transmitted by the elastic membrane is not affected by the dirt.

The utility model relates to the technical field of air pressing equipment, in particular to air pressing equipment integrating an air dryer and an air compressor into a skid, which comprises a skid seat, an air compressor, a refrigeration type compressed air dryer, a compressed air filter, an air-water separator group and a double compressed air filter group. The utility model focuses on the innovation of the air pressing equipment, and provides the air pressing equipment which integrates the air dryer and the air compressor into the skid for solving the problems of dispersion, low efficiency, poor precision and the like of the traditional air dryer and the traditional pressing equipment. The air compressor supplies air, the refrigeration type compressed air dryer dehumidifies and then is precisely regulated and controlled through the PLC in combination with the high-precision pressure controller, and the device has the outstanding advantages of integration, high efficiency, precise pressure control, safety, reliability, wide application and the like, and can be widely applied to air pressure testing requirements of industries such as petrochemical engineering, natural gas, pressure pipelines and pressure containers.

The invention belongs to the field of electro-hydrostatic actuators, and particularly relates to an electro-hydrostatic actuator structure with a high servo characteristic and a control method. Comprising a servo motor, a hydraulic pump, a hydraulic control one-way valve, a shuttle valve, an electromagnetic valve, a pressure sensor, an actuator cylinder and a controller. The servo motor is mechanically connected with the hydraulic pump, hydraulic control one-way valves are connected between the actuating cylinder and an oil inlet and outlet path of the hydraulic pump, and the pressure of remote control ports of the two hydraulic control one-way valves is switched through the two electromagnetic valves. The pressure sensors measure the pressure of the two cavities of the actuator cylinder and transmit the pressure to the controller. The two inlets of the shuttle valve are respectively communicated with the two cavities of the actuating cylinder to select the high-pressure side pressure in the oil cavity of the actuating cylinder; and the controller controls the rotating speed and the torque of the servo motor after receiving the position instruction, the motor state parameters and the data of the pressure sensor. According to the electro-hydrostatic actuator, the rotating speed overshoot of the hydraulic pump in the starting process can be reduced, and the servo characteristic of the electro-hydrostatic actuator is improved.

The invention provides an automatic testing system for the stability of a pressure sensor. The automatic testing system comprises an upper computer, a high-precision pressure controller, a constant-temperature box, a multi-channel electromagnetic valve array, an IO module, a data acquisition module and a testing tool. According to the system, the upper computer controls the high-precision pressure controller to output set pressure, meanwhile, the constant temperature box is controlled to maintain a constant temperature environment, the multi-channel electromagnetic valve array is utilized to circularly switch multiple test channels through a time triggering mechanism, the test process is automatically executed according to a preset period, and the test efficiency is improved. Output data of a sensor to be tested in the constant temperature box under set pressure are collected in real time, a pressure and temperature curve is drawn dynamically, and the data are stored and analyzed. The system supports multi-channel parallel testing, parameter configuration and real-time data visualization, solves the technical problems of low automation degree, poor environment consistency and difficulty in synchronous testing of sensors with different measuring ranges in traditional stability testing, and remarkably improves the testing efficiency and the data reliability.

The invention provides an ultramicro dispensing device and method based on air pressure-vision double closed-loop control, and belongs to the technical field of micro-nano manufacturing, the device comprises an air source, a pressure reducing valve, a Venturi tube, an electronic pressure controller, an electromagnetic valve circuit, a digital-to-analog conversion module, a calculation module, an air pressure sensor, a dispensing needle tube, a vision module and a dispensing platform, the method comprises the following steps: detecting the diameter of a glue spot in real time by adopting a visual unit, dynamically identifying an air pressure-glue spot diameter nonlinear compensation model, and adjusting the air pressure of a dispensing needle tube by adopting a closed-loop controller to realize accurate control of the glue spot. Experimental results show that the glue spot control with the minimum diameter of 9.87 microns can be realized, the quantitative dispensing of 10 microns, 20 microns, 30 microns and 40 microns can be completed, the error is within 8.3%, and the glue spot control device has the advantages of high precision and high stability.

This invention discloses a temperature-compensated seepage-shear coupling true triaxial testing apparatus and control method. The apparatus includes a pressure chamber, a shear box, a temperature control system, a pressure application system, and a temperature-displacement corrector. The shear box is housed within the pressure chamber. The temperature control system includes a heat transfer jacket, multi-point thermometers, and a temperature controller. The heat transfer jacket is fitted over the shear box, and the multi-point thermometers are located within the cavity. The pressure application system includes a confining pressure loading device, a pressure head, and a pressure controller. The confining pressure loading device injects a confining pressure medium into the pressure chamber, and the pressure head applies a force to the shear box. The temperature-displacement corrector is electrically connected to the temperature control system and the pressure application system. This apparatus features a temperature control system to precisely regulate the temperature during the test, thereby simulating deep environments at different temperatures. Furthermore, the temperature-displacement corrector dynamically corrects the force applied by the pressure application system, reducing additional forces caused by thermal expansion or contraction and improving stress control accuracy.

The utility model relates to the technical field of foaming simulation of foam fracturing fluid, in particular to a foaming simulation device for the foam fracturing fluid. The foam fracturing fluid foaming simulation device comprises a simulation bin and a simulation crack plate located in the simulation bin, a feeding pipe is fixedly installed at the front end of the simulation bin, a control valve is fixedly installed on the feeding pipe, an access hole is formed in the rear end of the simulation bin, a detachable sealing cover is installed at the access hole, an observation hole is formed in the simulation bin, and the control valve is fixedly installed on the observation hole. A transparent glass cover is fixedly mounted at the observation opening; an environment simulation structure is mounted on the simulation bin and comprises a plurality of groups of electric heating plates which are fixedly mounted in the simulation bin and are arranged and distributed. According to the utility model, the independent temperature controller is used for controlling the plurality of groups of electric heating plates to realize partitioned temperature control in the simulation bin, the temperature gradient of different well depths can be accurately reproduced, and meanwhile, the pressure controller can stably maintain the pressure in the simulation bin, so that foam fracturing fluid is foamed in an environment with the same temperature and pressure as the underground environment, and the accuracy of experimental data is improved.

The utility model discloses a skin extrusion / ink-jet composite printing device, which belongs to the technical field of biological tissue printing and comprises a computer, a three-dimensional motion system, an ink box, an ink-jet printing head, an extrusion printing head, a temperature control substrate, an air pump and a pressure controller. The ink box is installed on the ink-jet printing head, and the ink-jet printing head and the extrusion printing head are installed on the three-dimensional motion system. The pressure controller is mounted on the air pump; the pressure controller is in air connection with the ink box and the extrusion printing head; the computer is electrically connected with the three-dimensional motion system, the ink-jet printing head and the pressure controller. The computer is used for controlling the three-dimensional motion system to move and further used for controlling ink jet of the ink jet printing head and controlling the pressure controller to output the air pressure value. The personalized skin printing device provided by the utility model is low in manufacturing cost and high in efficiency.

The utility model relates to the technical field of trioxymethylene reactor pressure detection, and discloses a trioxymethylene reactor pressure detection device, which comprises a reactor main body, a pressure detector and a display panel, a pressure controller is arranged on the reactor main body, and a reactor gas phase pipeline is arranged on the reactor main body. According to the trioxymethylene reactor pressure detection device, the pressure detector is arranged on the reactor gas phase pipeline of the reactor main body, the pressure controller is installed on the reactor main body, the pressure detector is arranged on the reactor gas phase pipeline, and the pressure controller is arranged on the reactor gas phase pipeline of the reactor main body. The internal pressure of the reactor gas phase pipeline can be detected through the pressure detector, the internal pressure of the reactor main body can be detected through the pressure controller, and the pressure difference between the two sides of the reactor silk screen layer can be obtained through the pressure controller and displayed on the display panel, so that the working condition of the reactor main body can be conveniently and quickly checked; and the blockage problem can be timely found and processed.

The invention discloses a vacuum system for microwave plasma chemical vapor deposition. Comprising a vacuum cavity body, a processor, an air inlet system and an air outlet system, wherein the air inlet system is arranged at an air inlet of the vacuum cavity and used for accurately controlling the flow and proportion of various component gases; the air outlet system is arranged at an air outlet of the vacuum cavity and used for being linked with the air inlet system and controlling the air pressure in the vacuum cavity body through the processor; and the air inlet system is formed by converging a plurality of air inlet units to the main path filter. The mass flow meter is matched with the air inlet branch and the filter, so that elements at the rear end are protected while accurate air inlet is realized, and the stability of the whole system is improved. A temperature control pipeline is formed by a pressure controller and a first air outlet diaphragm valve B20, the temperature needed by thin film deposition can be accurately controlled, and temperature control is simple and convenient. The state requirement and maintenance of the vacuum cavity can be met, and accurate control over the temperature is achieved through accurate control over air inlet and outlet.

The invention provides an oil-gas pump all-in-one machine and a vehicle, and the oil-gas pump all-in-one machine comprises a driving motor which is provided with a driving shaft with two output ends; the steering oil pump is connected with a shell of the driving motor, and an input shaft of the steering oil pump is connected with the first end of the driving shaft; an input shaft of the air compressor is connected with the second end of the driving shaft through an electromagnetic clutch; the pressure sensor is connected with the steering oil pump, and the pressure sensor is used for detecting the pressure of an oil outlet of the steering oil pump; the controller is connected with a shell of the driving motor, the controller is electrically connected with the driving motor, the pressure sensor and the electromagnetic clutch, the controller is used for regulating and controlling the rotating speed of the driving motor according to the pressure of the oil outlet, and the controller is further used for controlling combination and separation of the electromagnetic clutch. According to the scheme, dynamic adjustment of the oil pressure of the steering oil pump is achieved, and the technical problem that dynamic control over the oil pressure of the steering oil pump cannot be achieved in the prior art is solved.

The embodiment of the application provides a kind of digital hydraulic closed pump control system and its control method, it can be applied to hydraulic transmission and control technical field, the system includes: closed hydraulic circuit, with high-pressure side oil circuit and low-pressure side oil circuit;Digital hydraulic valve group includes cartridge valve between high-pressure side oil circuit and low-pressure side oil circuit, cartridge valve has control cavity, the pressure in control cavity is used to control the conduction state of cartridge valve, multiple high-speed switch valve is connected with the control cavity of cartridge valve, for controlling the pressure of control cavity;Controller is configured to: when the pressure gradient of high-pressure side oil circuit exceeds limit value, multiple high-speed switch valve is output first control signal to drive multiple high-speed switch valve to adjust the pressure in control cavity, to make high-pressure side oil circuit and low-pressure side oil circuit at least partially conductive;When the pressure gradient does not exceed limit value, multiple high-speed switch valve is output second control signal to drive multiple high-speed switch valve to make cartridge valve keep closed state.

An air bag universal detection device relates to the field of detection device. The air bag universal detection device includes a test box with multiple casters on the bottom, the outer wall of the test box is respectively connected with an inflation interface, an air extraction interface and a drainage interface, the inner bottom of the test box is fixedly connected with at least two air compressors, an air storage tank and a double valve pressure controller, the exhaust port of each air compressor is connected with the air storage tank through a first connecting pipe provided with a first electromagnetic valve, the air storage tank is respectively connected with the inflation interface, the air extraction interface and the drainage interface through a second connecting pipe, a third connecting pipe and a fourth connecting pipe, the second connecting pipe is sequentially connected with a filter, a proportional flow valve and the double valve pressure controller away from the air storage tank, the third connecting pipe is sequentially connected with a second electromagnetic valve and a vacuum generator away from the air storage tank, and the fourth connecting pipe is provided with a third electromagnetic valve. The air bag universal detection device has the advantages of convenient movement, high detection efficiency and precision, adaptation to performance detection of multiple models of air bags and no need of external gas cylinders.

The invention belongs to an atomization device, and provides a miniaturized liquid atomization device and a control method thereof in order to solve the technical problems that an existing cylinder valve is unchanged in replacement, low in safety and incapable of achieving zero leakage. The liquid cavity is communicated with the gas cavity through an on-off device, an atomizer device and a pressure controller in sequence, the gas cavity is communicated with the outside through a switch device and a pressure reducing device in sequence, an outlet of the pressure reducing device is communicated with the outside, and the on-off device, the atomizer device and the pressure controller are integrally arranged between the liquid cavity and the gas cavity. The switching device and the pressure reducing device are integrated at the gas cavity outlet. While the weight is reduced, the leakage risk is greatly reduced.

The application discloses a pressure controller, which comprises a shell, a working part and a switch part, the switch part comprising a movable contact, a first static contact and a second static contact, the switch part comprising a mounting part, a transmission part and a jump function part, the transmission part being in transmission connection with the mounting part, and the movable contact being in fixed connection with the mounting part; the transmission part comprising a limiting structure, the jump function part comprising a fixed end and a movable end, the fixed end being fixed in position relative to the shell, and the movable end being connected with the mounting part; when the pressure controller is switched from a first working state to a second working state, the working part moves upwards and abuts against the transmission part, the transmission part drives the mounting part to move upwards, and the movable contact is in contact with the first static contact; when the pressure controller is switched back to the first working state, the working part falls back, the transmission part moves downwards, the limiting structure abuts against the mounting part and drives the mounting part to move downwards, and the movable contact is in contact with the second static contact. Through the above structure design, the force distribution of the switch part is optimized, and the service life of the switch part is prolonged.

This invention discloses an intelligent portable variable-energy continuous-power penetrometer, belonging to the technical field of engineering testing equipment. The intelligent portable variable-energy continuous-power penetrometer includes a probe handle and a probe rod, and further includes: a probe base connected to the probe rod, the probe base having an inner cavity; a force sensor disposed within the inner cavity; a probe cone with a pressure block at the top, the pressure block being slidably connected to the side wall of the inner cavity, and the pressure block abutting against the force sensor; and a controller electrically connected to the force sensor, the force sensor being used to detect the real-time pressure on the pressure block, and the controller being electrically connected to a display, the controller being used to control the display to show the real-time pressure. This intelligent portable variable-energy continuous-power penetrometer ensures that even when the probe rod is deflected, i.e., when the soil is in contact with the probe rod, the frictional force of the soil on the probe rod will not affect the detection of the soil's mechanical properties, thus guaranteeing the accuracy of the measurement results.

The utility model provides a kind of pantograph overhauling circuit, comprising first air switch, first fuse, first button, second button, first relay, second relay, third relay, first time relay, second time relay, first indicator light, second indicator light, first pressure controller, first differential pressure controller, first solenoid valve;The utility model is innovative design to air path and circuit, when opening U9 valve simulation air path leaks, solenoid valve is disconnected and closed, and total wind source is cut off.Real-time detection and safety control to air path are realized, problems in air path system can be found in time and handled through this innovative scheme, to avoid the occurrence of safety accident, pantograph overhauling work is provided with more safe and reliable guarantee.

The invention discloses an integrated leakage monitoring device with high applicability. The integrated leakage monitoring device with high applicability comprises a metal connecting pipe, a jacket nut, a flexible connecting pipe assembly, a four-way connector, a stop valve, a threaded diaphragm pressure controller, a pressure gauge and a sealing washer, the metal connecting pipe is used for connecting tested equipment and the flexible connecting pipe assembly, the end, connected with the tested equipment, of the metal connecting pipe is provided with a connecting threaded connector, and the end, connected with the flexible connecting pipe assembly, of the metal connecting pipe is provided with a jacket nut and a sealing washer. The flexible connecting pipe assembly is used for connecting a metal connecting pipe and a four-way connector, the end connected with the metal connecting pipe is provided with a connecting threaded connector, and the end connected with the four-way connector is provided with a jacket nut and a sealing washer. The four-way connector is used for connecting the flexible connecting pipe assembly, the threaded diaphragm pressure controller, the stop valve and the pressure gauge; one end of the threaded diaphragm pressure controller is connected with the four-way joint, and the other end is connected with the pressure monitoring electric interface; one end of the stop valve is connected with the four-way connector, and the other end is a drainage outlet.

This utility model discloses a cable rewinding protection device for an electric loader, including multiple magnetic blocks mounted on the side plate of the drum and a sensing probe mounted on the rear frame. It also includes a pressure controller, a stop detection controller, and a stop relay. This utility model detects a stop by sensing the magnetic blocks that rotate with the drum. When a stop occurs, an emergency stop braking control circuit controls the loader to brake, thereby preventing the loader from continuing to retreat and causing cable damage due to the drum stopping. This utility model also has the advantages of simple structure, low cost, and high reliability.

The invention discloses a steam drum pressure gradient control method and related equipment, and relates to the technical field of industrial process control, and the method comprises the steps: obtaining a real-time pressure value of a steam drum; under the condition that the real-time pressure value is larger than or equal to the preset first pressure value, a first pressure controller is controlled to adjust the opening degree of a pressure adjusting valve of the steam pocket, so that the real-time pressure value reaches a target pressure value; a second pressure controller is controlled to conduct gradient adjustment on the opening degree of a diffusion adjusting valve of the steam pocket so that the real-time pressure value of the steam pocket can be decreased in a stepped mode; under the condition that the opening degree of the diffusion adjusting valve of the steam pocket is larger than a preset opening degree threshold value, the opening degree of a water supplementing adjusting valve of the steam pocket is increased; and under the condition that the real-time pressure value is lower than a second preset pressure value, the diffusion adjusting valve is closed, and the second preset pressure value is smaller than the first preset pressure value.

The invention discloses an angle correction mechanism for negative angle machining, and relates to the field of negative angle machining. The angle correction mechanism for negative angle machining comprises a fixed table, a recognition device, a first correction rod, a second correction rod, a first monitoring device, a mounting frame, a workpiece pushing claw and a conveying piece. According to the angle correction mechanism for negative angle machining, the structure that the first monitoring device is installed on the upper pressing die in the negative angle machining device is adopted, and before a workpiece is corrected, the static distances between the first monitoring straight groove and the second monitoring straight groove are obtained through the first displacement sensor and the second displacement sensor; in the negative angle forming process, the dynamic distance between a second displacement sensor and a second monitoring straight groove is obtained through the second displacement sensor, data are transmitted to a medium-pressure controller through a transmission piece, the medium-pressure controller processes and evaluates the data, whether the movable plate in the negative angle machining device drifts due to long-term use or not is judged, and the negative angle forming process is completed. The correction mechanism failure is effectively avoided.

The invention relates to the technical field of pressure controller optimization methods, provides a PID (Proportion Integration Differentiation) pressure controller optimization method, and solves the problem of pressure fluctuation in a methanol supply system. The method comprises the following steps: S100, establishing a process dynamic model of the marine methanol fuel supply system, and determining key equipment and operation conditions; s200, constructing a fitness function according to an integral value of an error between a set value SP and a process value PV of a PID pressure controller of the methanol fuel supply system along with time; s300, taking a proportionality coefficient and an integral coefficient of a PID pressure controller of the methanol fuel supply system as optimization variables, and forming a search space of two dimensions in a particle swarm algorithm; s400, performing multi-working-condition dynamic simulation on the methanol supply system process, and optimizing the performance of a PID pressure controller of the marine methanol fuel supply system under different working conditions by using a particle swarm algorithm; adjusting controller parameters through a multi-objective optimization algorithm; and S500, adjustment is carried out based on an actual application scene, pressure fluctuation is reduced, and the energy efficiency and the system stability are improved.

This application discloses an electrostatic chuck leak rate detection system, comprising: multiple channels connecting a gas source to the vacuum chamber of the electrostatic chuck under test, transmitting gas supplied from the gas source to the vacuum chamber; multiple universal pressure controller modules disposed outside the vacuum chamber and connected to the multiple channels one by one, each universal pressure controller module including a universal pressure controller, a pressure sensor, a flow sensor, and an electric regulating valve; a main control unit module communicating with the multiple universal pressure controller modules, used to: input a configured preset voltage and preset back pressure into a preset three-dimensional dynamic correlation model of voltage-back pressure-leak rate, so as to output the corresponding leak rate prediction value; when it is determined that there is a leak in the electrostatic chuck under test based on the leak rate prediction value and the leak rate detection value detected by the gas flow rate collected through each channel, the corresponding electric regulating valve is controlled by each universal pressure controller to adjust the gas flow rate transmitted to the vacuum chamber to form a preset back pressure.

The invention relates to a pipe vacuum closed-loop frequency conversion control system which comprises a vacuum pump, a contactor, a frequency converter, a pressure transmitter and a pressure controller, the power input end of the frequency converter is connected to a three-phase power supply, the power output end of the frequency converter is connected to the vacuum pump through a contact of the contactor, and the pressure controller is connected with the pressure transmitter and the frequency converter. The pressure controller comprises a voltage division circuit, a first comparison circuit, a second comparison circuit, a first relay, a second relay and a third relay, one end of the voltage division circuit is connected to the output end of the pressure transmitter, and the other end of the voltage division circuit is grounded. Compared with the prior art, the method has the advantages that the cost is low, the control precision in an unstable state and under external interference is improved, and the like.

Hydraulic system (1) for a dual clutch transmission with a first electric pump (4) which is connected via an output to an actuating fluid line (6) of a dual clutch, with a second pump (12) which is connected via an output to an actuating line (11) to gear actuators (GS-A, GS-B, GS-C) and a cooling and lubrication line (16), wherein the actuating line (11) is designed as a supply line for actuating the gear actuators (GS-A, GS-B, GS-C), wherein a pressure distribution (10) for the gear actuators (GS-A, GS-B, GS-C) with an intermediate pressure control (9) is connected to the second pump (12) via the control line (11), wherein the cooling and lubrication line (16) is connected to an inlet of at least one cooling and lubrication valve (20) for a component (17, 18, 19) or group of components to be cooled and / or lubricated, characterized by the fact that a control input of the cooling and lubrication valve (20) is directly connected to an output port of the pressure control (9) via a control line (23), wherein the actuating fluid line (6) of the double clutch is designed to be pressure-independent and fluidically separated from the areas pressurized by the second pump (12).

The utility model relates to the technical field of waste heat recycling, in particular to a waste heat recycling device which comprises a base, a waste heat recycling box and an air inlet cover, the top of the base is provided with the waste heat recycling box through screws, and a heat exchange pipe disc is arranged in the waste heat recycling box in a sleeved mode. A temperature sensor is mounted on one side of the waste heat recovery box through a screw, a pressure controller is mounted at one end of the temperature sensor through a screw, and an air inlet cover is mounted at the top of the waste heat recovery box through a bolt; an air inlet is formed in the top of the air inlet cover, a suction fan is installed in the air inlet through bolts, a sealing cover is clamped to the top of the air inlet, and a recycling pipe is arranged on the top of the sealing cover in a communicating mode; the waste heat recycling device can conveniently detect the pressure value in the waste heat recycling box, when the pressure value exceeds a set value, the pressure controller can automatically close the electromagnetic valve, the sealing effect is achieved, and hot air in the waste heat recycling box is prevented from flowing back.

The invention discloses a battery pack, a battery pack pressure regulation and control method, a pressure controller and a vehicle, and belongs to the technical field of battery management. According to one specific embodiment, the method comprises the steps that pressure data of inert gas in a battery pack can be obtained through a pressure controller arranged on the outer surface of a battery pack shell, and under the condition that it is judged that the pressure data of the inert gas exceeds a set pressure threshold value range, the pressure of the inert gas is regulated and controlled; and maintaining a normal contact state between a cell electrode and an electrolyte included in the solid-state battery stack through the regulated pressure. According to the embodiment of the invention, the pressure of the battery pack is controlled without an additional rigid mechanical pressure control device or an additional pneumatic device, so that the internal space of the battery pack is saved and the weight of the battery pack is reduced; by dynamically regulating and controlling the pressure of the inert gas in the battery pack in real time, the problem of poor contact between the battery cell electrode and the electrolyte is solved, and the durability and reliability of the solid-state battery are improved.

A cooling distribution unit includes a first control loop, a second control loop, a first pressure sensor, a second pressure sensor, and a controller. The second control loop includes an inlet and an outlet. A first pressure sensor is located at the inlet and is configured to sense a pressure of the second fluid. A second pressure sensor is located at the inlet and is configured to sense a pressure of the second fluid. The controller is configured to operate in a differential pressure mode, detect a failure of the first pressure sensor and the second pressure sensor, and operate in a flow mode in response to the failure. In the differential pressure mode, the controller operates based on a pressure difference of the second fluid between the inlet and the outlet. In the flow mode, the controller operates based on the flow of the second fluid.

The utility model belongs to the technical field of geotechnical engineering, and particularly relates to a slurry-rock combination permeability evolution research test device, which is characterized in that a confining pressure controller loads confining pressure to a rock sample in a main pressure chamber to control the pressure on the outer side of the rock sample, and one end of the confining pressure controller is connected with a monitoring system for controlling the pressure application; the other end is connected with the main pressure chamber; the axial pressure controller applies axial pressure through an upper bearing platform of the main pressure chamber, the axial pressure controller is respectively connected with the main pressure chamber and the monitoring system, the water supply pressurization control system and the high-pressure grouting system are connected with the main pressure chamber through pipelines, and the rock fracture prefabricating device adopts a three-section mold to provide a required standard rock sample for a test. The crack filling bodies with different shapes, roughness and widths are manufactured in advance by using the solid paraffin, and the built-in cracks meeting different requirements can be manufactured in the process of manufacturing the standard rock sample according to the characteristic that the crack filling bodies are melted when being heated, so that the method is simpler and more practical, and the actual requirements are better met.