957 results about "Working pressure" patented technology

The invention relates to a method and a system for detecting the sealing performance of a spherical underwater connector. The method comprises the following steps: injecting dry inert gas with the same working pressure into a sealing ring through a pressure measuring hole; 5-15-degree and 0.1-1Hz sinusoidal deflection motion is applied to the sphere, and the dynamic working condition that the underwater pipeline is impacted by ocean current for a long time is simulated through short-term limit periodic deflection motion; meanwhile, the pressure fluctuation amplitude delta P is recorded with the sampling frequency larger than or equal to 10 Hz, the first period delta P0 serves as the benchmark, delta Pn is measured regularly, and a delta P (t) curve is built; and determining a critical threshold value delta Pmax through an experiment, and calculating the duration of increasing the delta P0 to the delta Pmax according to the delta P (t) curve as the predicted service life. Through short-term limit dynamic loading and high-frequency monitoring, real-time state detection and long-term performance evaluation of the sealing ring are achieved, and the problem that sealing performance degradation under alternating stress cannot be predicted through traditional static detection is solved.

The utility model belongs to the technical field of glue supply, and particularly relates to a high-pressure fluid supply device which comprises a bearing base, first power cylinders are fixedly installed above the left end and the right end of the bearing base respectively, an air control box is fixedly installed on the right side wall of the first power cylinder on the right side, and a pressure plate pump is fixedly installed at the top end of each first power cylinder. A second power air cylinder is fixedly installed in the middle of the bottom end of the pressure plate pump, the output end of the second power air cylinder is fixedly connected with a plunger pump, a glue outlet is formed in the front outer wall of the top of the plunger pump, a pressure plate body is fixedly installed at the bottom of the plunger pump, and an exhaust assembly is installed on the upper front portion of the pressure plate body. The whole plunger pump is made of 304 stainless steel materials, has high strength and good corrosion resistance, the maximum working pressure is 440 bar, and the plunger pump is convenient to meet the operation requirement of high-pressure fluid supply.

The invention relates to the technical field of petrochemical equipment sealing, in particular to a flange sealing performance evaluation method based on bolt axial stress, which comprises the following steps: establishing a nonlinear stress relationship between a gasket and bolt axial force; establishing a relationship between the axial stress of the bolt and the sealing contact stress of the contact surface of the gasket under different working pressures; constructing a three-dimensional model of a real sealing surface; establishing a three-dimensional model of the sealing surface contact process; obtaining the change of a leakage gap between the contact surfaces under different contact stresses, and establishing a relation model of the leakage gap of the contact interface and the sealing contact stress; establishing a quantitative evaluation model among the sealing contact stress, the leakage clearance and the leakage rate; obtaining the contact stress under the actual working condition, and calculating whether the corresponding leakage rate meets the tightness judgment standard or not so as to judge the sealing state of the flange. The invention aims to solve the technical problem that the metal sealing performance of in-service flange connection cannot be quantitatively and online evaluated in the prior art.

The invention discloses a heavy truck hydraulic retarder control method and system and a vehicle, and belongs to the technical field of retarder control. The method comprises the steps that the target braking torque value of a retarder is read; if the target braking torque value is larger than or equal to the maximum output torque value, the target braking torque value is set to be the maximum output torque value; if yes, the target braking torque value is dynamically compensated; calculating a target working pressure value of the retarder cavity; and the deviation between the target working pressure value of the retarder containing cavity and the current working pressure and the deviation between the proportional valve target and the actual current are calculated, calculation is conducted through a PID controller, and the output serves as the input of the retarder proportional valve so as to control the output torque of the retarder. According to the invention, the output torque delay can be reduced so as to improve the braking performance of the retarder, the braking precision and stability are relatively high, and relatively stable braking can be maintained under the conditions of different vehicle speeds and different oil temperatures.

The invention belongs to the technical field of shoe sole waste recycling treatment, and discloses a shoe sole processing waste recycling device which comprises a crushing box, two groups of crushing rollers are rotatably arranged on the inner side of the crushing box, linkage pressure applying assemblies are arranged on the two sides of the crushing rollers, and each linkage pressure applying assembly comprises two groups of limiting guide columns. According to the crushing device, through cooperation of structures such as the linkage pressure applying assembly and the crushing rollers, power can be provided for the pressure applying device when the crushing rollers rotate, it is guaranteed that downward pressure is provided while the crushing rollers rotate, and the crushing efficiency is improved; and therefore, the problems that the normal crushing treatment is influenced due to accumulation or clamping stagnation caused by the fact that rubber cannot be quickly concentrated between the crushing rollers, and the working pressure of workers is greatly increased are effectively solved.

The utility model discloses an air-blowing type precise high-speed seeding machine, and belongs to the technical field of seeding machinery. Comprising a seeder rack, and more than one air-blowing type precision seeder, a positive pressure generating device, a seeding box, a rotary seed disc driving device and a seed furrow opener are arranged on the seeder rack; the air-blowing type precision seeder comprises a high-pressure side shell, a rotary seed disc, a low-pressure side shell, a high-pressure maintaining structure and a seed discharging structure; the seed metering structure comprises a seed metering pipe and a seed suction hole blocking body; the rotary seed disc is rotationally connected with the high-pressure side shell, the low-pressure side shell is provided with a working pressure relief airflow discharge hole, and the high-pressure maintaining structure and the seed suction hole blocking body are connected with the low-pressure side shell; the high-pressure maintaining structure comprises a low-pressure side shell and a low-pressure side inner shell, the low-pressure side inner shell is rotationally connected with the low-pressure side shell, the seed suction hole blocking body is pressed and attached to the seed release position of the rotation track of the seed suction hole, and the seed suction device has the advantages of being high in working reliability, long in service life, low in maintenance rate, capable of saving energy, reducing consumption and the like.

The invention discloses a method and a system for predicting the residual life of a downhole casing in a full life cycle. The method comprises the following steps: acquiring the working pressure, the internal pressure resistance safety coefficient and the extrusion resistance safety coefficient of a to-be-tested casing; based on the working pressure of the to-be-tested casing, the internal pressure resistance safety coefficient and a pre-constructed first model, obtaining the internal pressure resistance safety service time of the to-be-tested casing; obtaining the anti-extrusion safety service time of the to-be-tested casing pipe based on the working pressure and the anti-extrusion safety coefficient of the to-be-tested casing pipe and a pre-constructed second model; and obtaining the residual life of the to-be-tested casing according to the internal pressure-resistant safe service time and the extrusion-resistant safe service time. By means of the method, life prediction of the shale gas downhole tubular column in the whole life cycle can be achieved, sleeve life prediction is more accurate, and the method has more practical production guiding significance.

A work machine includes a flow control valve that controls the flow rate of a hydraulic operating fluid supplied from a hydraulic pump to a hydraulic cylinder, a solenoid valve that generates an operation pressure for operating the flow control valve, and a controller. The controller executes learning processing of changing in a stepwise manner the operation pressure generated by the solenoid valve, sensing the pressure of the hydraulic cylinder, and storing the operation pressure when the pressure of the hydraulic cylinder has become a reference value, as a learning result operation pressure. The controller calculates a differential pressure across the flow control valve and computes a target opening area of the flow control valve on the basis of the differential pressure across the flow control valve and a target flow rate of the hydraulic operating fluid that passes through the flow control valve. The controller computes a target value of the operation pressure generated by the solenoid valve, on the basis of an opening characteristic table, the target opening area, and the learning result operation pressure, and controls the solenoid valve on the basis of the target value of the operation pressure.

The invention relates to the technical field of energy storage and heat dissipation, and discloses a centralized energy storage power station heat dissipation system. A data acquisition module of the system obtains historical operation data at different altitudes and generates a historical cooling parameter set; a feature analysis module extracts features from the features to obtain a historical feature parameter set, and a trend change feature matrix is established according to the historical feature parameter set; the pressure adjusting module constructs a pressure control space based on the matrix, and determines a feature early warning index set by calculating the parameter aggregation degree of historical abnormal events; the heat dissipation execution module extracts real-time characteristic parameters to establish state vectors, and calculates the position deviation degree between the state vectors and the early warning index set to generate real-time pressure regulation factors. The pressure adjusting module generates a pressure control model in combination with real-time adjusting factors, historical characteristic parameters and a trend matrix and outputs cooperative control parameters of the variable-frequency screw pump and the gear pump, precise adjustment of the working pressure of the cooling liquid is achieved, and efficient and stable operation of the energy storage power station is guaranteed.

The invention provides a real-time monitoring method and system for abrasion of a hobbing cutter of a shield tunneling machine, and relates to the technical field of underground engineering construction equipment.The method comprises the steps that working pressure data, working temperature data and surface image data of a target hobbing cutter of the shield tunneling machine are collected based on a pressure sensor, a temperature sensor and a hobbing cutter camera; transmitting the data to a central processing system based on an advanced encryption standard algorithm and carrying out preprocessing operation; analyzing the data based on a long and short term memory network model, a support vector machine model and a convolutional neural network model, and generating a pressure data score, a temperature data score and an image data score; calculating a wear state score based on a fusion evaluation algorithm; the remaining service life of the hob is determined based on the Monte Carlo simulation prediction algorithm, and when the service life is lower than the preset service life lower limit, an abrasion early warning mechanism is triggered, so that the abrasion state of the hob can be accurately monitored, the maintenance cost is reduced, and the safety and economic benefits of shield construction are improved.

The invention discloses fine grinding equipment and a grinding method for porcelain insulators, and relates to the field of insulator production, the fine grinding equipment comprises a pug refining barrel and a grinding box, the bottom end of the grinding box communicates with the top end of the pug refining barrel, two grinding rollers are rotationally connected into the grinding box, the two grinding rollers are arranged in a mutually attached mode, and the two grinding rollers are arranged in a matched mode. A heating roller is rotatably connected to the interior of the pug refining barrel, a protruding end is fixed to the outer side of the heating roller, and the two grinding rollers rotate oppositely, so that falling pug is subjected to primary grinding, large particles in the pug are ground, bubbles in the pug are discharged through extrusion, extrusion and re-grinding are conducted in the pug refining barrel, and the pug refining efficiency is improved. During secondary grinding, the vacuum pump continuously extracts air, keeps a vacuum environment, absorbs bubbles and moisture in the pug and discharges the bubbles and moisture out of the pug cylinder, so that the fineness and the purity of the pug are improved, and meanwhile, through primary grinding, the working pressure of the pug cylinder can be reduced, and the service life of the pug cylinder can be prolonged.

The utility model discloses an air-blowing type precision seeder for an air-blowing type precision high-speed seeder, and belongs to the technical field of seeding machinery. Comprising a high-pressure side shell, a rotary seed disc, a low-pressure side shell, a high-pressure maintaining structure and a seed metering structure, the seed metering structure comprises a seed metering pipe and a seed suction hole blocking body; the rotary seed disc is rotationally connected with the high-pressure side shell, a seed inlet of the seed discharging pipe is formed below a seed releasing position, the low-pressure side shell is provided with a working pressure relief airflow discharging hole, and the high-pressure maintaining structure and the seed suction hole blocking body are connected with the low-pressure side shell; the high-pressure maintaining structure comprises a low-pressure side shell and a low-pressure side inner shell which are rotationally connected, a cavity formed between the low-pressure side inner shell and the low-pressure side shell is a leakage gap air pressure containing cavity, and the edge portion of the low-pressure side shell is connected with the edge portion of the high-pressure side shell in a sealed mode. And the edge part of the low-pressure side inner shell and the edge part of the rotary seed disc are pressed and attached together in a sealing manner. The device has the characteristics of high working reliability, long service life, low maintenance rate, energy conservation, consumption reduction and the like.

An embodiment uses a symmetrical elastomeric design with hydraulic pistons on either end (as opposed to a single piston on conventional BOPs) which allows for lower actuation forces, reduced friction, and reduced wear and tear. The lower actuation forces correspond to lower operating pressures which allows the body and housing to be smaller, leading to a smaller footprint.

The invention relates to the technical field of ball valve manufacturing, in particular to a manufacturing method and system of a high-sealing-performance PVC integrated ball valve, which can improve the manufacturing efficiency and ensure the consistency and stability of ball valve production. The method comprises the steps that application scene information of the ball valve is collected; the application scene information comprises working pressure, a medium type, a temperature range and an installation condition; carrying out element extraction on the application scene information, and carrying out demand analysis to obtain a production element set; on the basis of the production element set, traversing a ball valve manufacturing scheme library to obtain a ball valve manufacturing scheme; inputting the ball valve manufacturing scheme into a pre-constructed ball valve performance analysis model to obtain an overall performance index of the ball valve; the overall performance index of the ball valve is compared with a preset performance index threshold value, if the overall performance index of the ball valve is larger than or equal to the preset performance index threshold value, it is indicated that the ball valve produced according to the ball valve manufacturing scheme is qualified, and the integrated ball valve is manufactured according to the ball valve manufacturing scheme.

The invention provides a multidisciplinary simulation analysis method and system for operation characteristics of a ship lubricating oil system, and belongs to the technical field of ship simulation, and the method comprises the steps: setting working parameters of the lubricating oil system, and setting interlocking control logic of the lubricating oil system; constructing an energy accumulator flow equation; the energy accumulator flow equation is constructed based on the relation between the instantaneous pressure and the instantaneous flow after the energy accumulator is started, and the relation is determined based on the fluid resistance characteristic of the lubricating oil system, the normal working pressure of the system and the normal working flow of the system; and the working parameters, the interlocking control logic and the energy accumulator flow equation are imported into simulation software, and a lubricating oil system simulation model is established. According to the method, the operating characteristics of the system are analyzed by setting the working parameters of the lubricating oil system, the interlocking control logic and the energy accumulator flow equation constructed based on the relationship between the instantaneous pressure and the flow and combining the simulation model, so that the accuracy of analyzing the influence of the pressure pulsation on the lubricating oil system is improved.

The invention relates to the technical field of compressor temperature control, and discloses a compressor temperature control system capable of preventing generation of condensate water, which comprises a sensing module, an execution module and a controller. The sensing module is used for collecting air temperature, relative humidity, system working pressure and circulating oil temperature parameters of the compressor in real time. The controller is configured to calculate the current pressure dew point of the system based on the air temperature, the relative humidity and the working pressure of the system; the pressure dew point serves as a floating lower limit, a preset system optimal working temperature upper limit serves as a fixed upper limit, and a dynamic safe working interval is determined; finally, a cooling unit and a heating unit in the execution module are cooperatively controlled to work according to the relation between the circulating oil temperature and the dynamic safety working interval. By establishing the dynamic safety lower limit changing along with the working condition, the problem that the compressor is prone to generating condensate water under the high-humidity or low-load working condition to cause oil emulsification is effectively solved, and accurate and energy-saving temperature control is achieved.

The invention relates to the technical field of hydraulic cylinders, and discloses a motor control type intelligent oil cylinder and a control method thereof.The motor control type intelligent oil cylinder comprises a cylinder barrel, a piston rod is arranged in the cylinder barrel, an integrated valve seat is fixedly connected to the outer surface of the cylinder barrel, and a low-pressure oil port and a high-pressure oil port are formed in the top of the integrated valve seat; a visual displacement detection sensor, a controller, a first temperature and pressure sensor and a second temperature and pressure sensor are arranged on the top of the integrated valve seat. The displacement of the piston rod is measured through the visual displacement detection sensor, and the real-time temperature of an emulsion medium and the working pressure of a rod cavity and a rodless cavity of the oil cylinder are detected through the first temperature and pressure sensor and the second temperature and pressure sensor. Meanwhile, the controller can collect the detected oil cylinder position and pressure temperature signals, and then control the two motor direct-drive type digital reversing valves through the collected data, so that the displacement of valve elements of the two control digital reversing valves is achieved, and accurate positioning and motion control of a piston rod are achieved.

The invention relates to the technical field of dust removal and cleaning, and discloses a lead screw surface dust removal and cleaning device which comprises two threaded support mechanisms and an elastic telescopic cleaning mechanism. A longitudinal hollow shell which is fixedly mounted in the component fixing opening and is hollow inside, a hollow pipe body which is placed inside the longitudinal hollow shell and can move along the axial direction of the longitudinal hollow shell, and a screw rod body which can longitudinally move along with the hollow pipe body and can abut against the surface of the screw rod body are arranged inside the screw rod body; the annular sponge brush is used for cleaning the screw rod; and the spiral spring is used for generating downward elastic pressure on the hollow pipe body. According to the lead screw surface dust removal and cleaning device, the elastic pressure type abutting effect on the surface of a lead screw is achieved through elasticity of a spiral spring, so that a sponge brush can act on the surface of the lead screw with certain force, the cleaning effect on the lead screw is improved, in addition, the device can adjust the working pressure according to the actual situation, and the working efficiency is improved. Therefore, the adjusting range of the cleaning pressure by the equipment is widened.

The present disclosure provides a solution for a system and a method for converting heat into work. The solution makes use of a nozzle, in which pressurized heat transfer liquid (HTL) and a Liquid-Vapor-Phase-Changing (LVPhC) working fluid is about the same pressure are mixed to form a LVPhC-HTL mixture, which in turn undergoes evaporation and isothermal or quasi-isothermal expansion while flowing in the nozzle that results in acceleration of the mixture. The accelerated mixture is ejected from to thereby rotate a turbine and produce work from the generated kinetic energy. The LVPhC is separated from the mixture and condensed after its ejection from the nozzle and its pressure is elevated back to the working pressure in the nozzle. The present solution exploits the thermodynamic advantages of each phase of the LVPhC.

The invention discloses a laser light emitting stability management method, device and system, a laser comprises an evaporator used for forming a direct cooling loop, a first throttling element, a compressor, a condenser and a second throttling element, and the management method specifically comprises the following steps that the temperature of the evaporator is obtained; acquiring rotating speeds of fans of the compressor and the condenser; and when the temperature of the evaporator is smaller than the minimum value of the first preset temperature range and the rotating speed of the compressor and the rotating speed of the fan of the condenser both reach the minimum preset rotating speed, the refrigerant flow of the first throttling element is lowered. The working pressure in the direct cooling plate is controlled by controlling the working state of the first throttling element, then the refrigerant flow in the evaporator is adjusted, it is ensured that normal light emitting of the laser is not affected by the temperature of the evaporator, and the low-temperature adaptability of the laser is greatly improved. The problem that normal operation of the laser is affected due to the fact that the temperature of the evaporator is too low under the low-environment-temperature and low-heat-load working conditions can be solved.

The invention relates to the technical field of high-end equipment manufacturing, in particular to a friction stir welding system pressure control method and system, electronic equipment and a storage medium, and the method comprises the steps that real-time sensor data in the welding process is obtained, and a controller preset algorithm module is used for analyzing and processing to obtain a real-time pressure value; and meanwhile, a plurality of modules such as a self-adaptive control algorithm module, a pressure prediction model, an online parameter identification model, a multi-mode switching module, an abnormal prediction model and an equipment health state evaluation model are further arranged to realize dynamic adjustment and control. The effects that the working pressure value of the friction stir welding system can be continuously and dynamically adjusted, the welding process is kept stable, self-adaptive control and precise control are achieved, the welding quality stability is improved, abnormity is early warned, parameters are adjusted, and the fault-tolerant threshold value is dynamically adjusted to maintain the control precision are achieved.

The invention relates to a valve arrangement (1; 81; 91) with several functional modules arranged in series from the group: valve disc group (8), safety valve group (7), throttle valve (171), wherein the valve disc group (8) has one or more valve discs (101, 102), each with at least one electrically controllable valve (103, 104) which is connected to an electrical supply line (17) and to a fluid supply line (18), wherein the throttle valve (171) is arranged upstream of the safety valve group (7) between a fluid connection (36) and the fluid supply line (18) of the valve disc group (8), wherein the safety valve group (7) has two safety valves (51, 52) which are designed to influence a fluid flow between the fluid connection (36) and the fluid supply line (18),wherein the safety control (7) is designed for the safety-oriented blocking of electrical control signals for the safety valves (51, 52), wherein the throttle valve is designed for a temporary reduction of a working pressure in the fluid supply line (18), and wherein a valve control (5) is designed to control the valve disc group (8) and the safety valve group (7).

The invention relates to a detection device for a pressure relief quick connector. The detection device comprises a data acquisition module, a detection execution module and an intelligent control and analysis module. The data acquisition module comprises a pressure sensor, a flow sensor, a displacement sensor and an industrial camera and is used for acquiring internal pressure, pressure relief rate, component displacement and appearance image data of the joint to be detected; the detection execution module comprises a pressure loading system, an environment simulation cabin and a pressure relief control mechanism and is used for simulating working pressure, an extreme environment and triggering pressure relief operation; and the intelligent control and analysis module comprises a detection controller and a data processing unit, and the detection controller is used for generating a detection scheme according to the basic information of the to-be-detected joint and controlling the data acquisition module and the detection execution module to detect the to-be-detected joint according to a detection process. And the data processing unit is used for analyzing the detection data and generating an evaluation report. The method has the effect of improving the joint detection efficiency and the detection quality.

The invention discloses a self-adaptive parameter control system and method for a halfpace field rice transplanter based on full-hydraulic transmission, particularly relates to the technical field of hydraulic parameter control, and aims to solve the technical problem of dynamic power competition between a walking system and a planting device when the full-hydraulic transmission rice transplanter works in a halfpace field. Working pressure signals of a walking motor and a planting device are monitored in real time, the divergence degree of envelope lines of the two pressure signals is calculated so as to recognize the power competition state of a system, and when power competition is detected, the required power of two execution mechanisms is dynamically calculated, and a hydraulic pump displacement distribution coefficient is generated; and then the interaction characteristics of the outlet pressure of the main pump and the output flow signal and the transmission characteristics of the pressure signal of the executing mechanism are fused, the dynamic balance degree of the system is generated, the displacement distribution coefficient is corrected, and finally the opening degree of the walking motor and the proportional valve of the planting device is synchronously adjusted based on the corrected coefficient. Accurate distribution and dynamic balance control of the power of the hydraulic system are achieved.

The utility model discloses a double-airbag scraper swing frame, which relates to the scraper technology field, including a scraper frame and an airbag receiving groove, end plates are symmetrically arranged at both ends of the airbag receiving groove, and the end plates are respectively connected to a first connecting shaft and a second connecting shaft by screws, and core shafts are symmetrically arranged at both ends of the scraper frame, and the core shaft is arranged in the center hole of the end plate, and a scraper frame is arranged on one side of the upper end of the scraper frame, and the lower end of the scraper frame is arranged in the airbag receiving groove, and an airbag is arranged in the airbag receiving groove, and two airbags are respectively arranged on both sides of the scraper frame, and the inflation and deflation of the double airbags are controlled by a pneumatic control system, and the airbag receiving groove and the outer ring of the scraper frame are provided with a protective cover. The utility model has a compact structure and is light in weight. The double airbags are arranged on both sides of the scraper frame, which can reduce the maximum size of at least one airbag when opened, and can achieve the required working pressure and swing amplitude in conjunction with the pneumatic control system, and is easy to operate.

An embodiment uses a symmetrical elastomeric design with hydraulic pistons on either end (as opposed to a single piston on conventional BOPs) which allows for lower actuation forces, reduced friction, and reduced wear and tear. The lower actuation forces correspond to lower operating pressures which allows the body and housing to be smaller, leading to a smaller footprint.

The utility model relates to the technical field of polishing equipment, in particular to polishing equipment convenient to clean, which comprises a machining table, a polishing arm is fixedly connected to the back surface of the machining table, and a transmission mechanism used for cleaning scraps is arranged in an inner cavity of the machining table. According to the table board machining device, waste and scraps on the surface of a table board slide into the machining table under the action of gravity, then the scraps are collected in a unified mode through the scrap frame, and therefore the scraps do not need to be cleared away through foreign objects, the recycling efficiency of leftover materials is improved, the working pressure of a user is relieved, and the working efficiency is improved. And meanwhile, a user can be prevented from making direct contact with leftover materials, the waste recycling purity is improved, impurities are prevented from being doped in waste chips, and the problems that after existing grinding equipment finishes grinding, the waste materials and the waste chips can be cleaned with the help of foreign objects, efficiency is low, and cleaning tools need to be treated are solved.

The utility model provides a constant-pressure centralized liquid supply system for a fully mechanized coal mining face of a coal mine, which is timely and rapid in reaction and short in treatment time, and can always enable the emulsion concentration, the emulsion liquid level, the emulsion working pressure and the like to be in a normal range. A pure water tank (3), a pure water pump, an automatic liquid preparation tank (4), a mixed liquid pump, an emulsified liquid tank (5) and a liquid inlet of an emulsification pump (6) are sequentially communicated, a liquid outlet of the emulsification pump (6), a high-pressure filter station (7), a liquid supply station (8) and a liquid inlet of a hydraulic support (9) are sequentially communicated, and a liquid outlet of the hydraulic support (9), a liquid return filter station (10) and the emulsified liquid tank (5) are sequentially communicated. The emulsified concentrated oil supply pump is communicated with the automatic liquid preparation tank (4) through an emulsified concentrated oil supply pipe (17), concentration sensors (15) and liquid level sensors (14) are arranged in the automatic liquid preparation tank (4) and the emulsified liquid tank (5), and pressure sensors are arranged at a liquid outlet of the emulsifying pump (6) and a liquid inlet of the hydraulic support (9).

Disclosed is a rupture disc assembly for use in making a temporary seal in a vessel such as a casing string. The rupture disc assembly may include a rupture disc having a side surface that has a shallow angle taper inward towards a bottom surface of the rupture disc, and a mounting apparatus to support the rupture disc so that the rupture disc forms the temporary seal. When a disc working pressure is applied to a top surface of the rupture disc, engagement / force transmission between the rupture disc and the mounting apparatus produces enough radial compression in the rupture disc due to the shallow angle taper to significantly mitigate or cancel tensile stresses thereby avoiding the rupture disc from breaking. The rupture disc may be configured to break when the rupture disc is subjected to a disc working pressure that is greater than the disc rupture pressure, thereby removing the temporary seal. An axial abutment surface feature may be provided which is configured and operable to limit downward axial movement of the rupture disc relative to said disc support mechanism and thus be operable to restrict the amount of compression said tapered wall surface of said disc support mechanism can exert on said at least a portion of said rupture disc when the top surface of the rupture disc is subjected to said hydraulic pressure within the well.

The invention relates to a tractor chassis gear shifting valve group which comprises a proportional pressure reducing valve, an electromagnetic clutch valve, a logic valve, an overload valve and a logic valve pressure regulating valve. The logic valve is arranged in a main oil way of the hydraulic system and used for controlling system pressure. The logic valve pressure regulating valve is connected with the logic valve and is used for regulating the working pressure of the logic valve; the proportional pressure reducing valve is arranged on the main oil way and used for controlling the opening and closing states of the gear shifting clutch. The electromagnetic clutch valve is arranged in the main oil way and is used for performing clutch control on the gear shifting system; the overload valve is connected to the lubrication heat dissipation oil way and used for conducting pressure protection on the lubrication heat dissipation system. The stability of pressure and flow change can be improved, and the reliability of the power shifting valve group of the tractor is improved.