110results about How to "Precise pressure control" patented technology

According to the energy storage coupling heat pump steam generation method and system, the mode that the heat pump device and the energy storage device cooperatively operate is adopted, and efficient and economical steam supply is achieved. The method comprises the steps that high-temperature water is prepared and stored in the off-peak electricity period through the heat pump device, and the high-temperature water is further heated through the energy storage device to generate superheated steam for a user to use. The energy storage device comprises a plurality of energy storage modules, and a heat exchange pipeline of the energy storage device can be switched between a parallel connection mode and a series connection mode through switching, so that deep heat release and flexible regulation and control are achieved. According to the method, the energy storage capacity and heat release power of the energy storage module are dynamically adjusted, enthalpy increment distribution of the heat pump and the energy storage device is optimized in combination with load prediction, and diversified steam requirements are met. And meanwhile, preheating or dynamic supplement is conducted on the energy storage module through the heat pump device, waste heat recovery is achieved, and the energy efficiency is improved. According to the method, the operation cost is remarkably reduced, the capacity of the system for adapting to load fluctuation is enhanced, and the method is suitable for industrial steam use scenes and has the advantages of being efficient, stable and flexible.

The invention discloses a rapid development method and system for a high-performance nodular cast iron material based on electronic metallurgy, and relates to the technical field of electronic metallurgy, and the rapid development method comprises the steps that a high-performance nodular cast iron raw material is smelted through multi-stage electron beams, and uniform molten metal is obtained; monitoring the chemical components and temperature change of the molten metal in real time, and dynamically adjusting the addition of the spheroidizing agent; the pouring speed and pressure of the molten metal subjected to spheroidizing treatment are intelligently controlled, and casting pouring is conducted; the internal stress change of the casting is monitored in real time through an embedded stress sensor, and the casting cooling process is adjusted; the cooled casting is subjected to surface treatment, heat treatment and machining; component detection and performance testing are conducted on the casting obtained after treatment and machining are completed; through the multi-stage electron beam melting technology, accurate control over the temperature and chemical components of the molten metal is achieved, and the uniformity and stability of the molten metal are ensured.

The invention provides an electric overflow valve and a pressure control method thereof.The electric overflow valve comprises a valve body assembly, an energy accumulator and a pressure regulating assembly, a valve cavity allowing a valve element to reciprocate is formed in the valve body assembly, a liquid inlet and a liquid return opening are formed in the valve cavity, and the valve element divides the valve cavity into a first cavity and a second cavity; the valve core reciprocates to realize different opening degrees; an energy storage cavity is formed in the energy accumulator, the pressure adjusting assembly comprises a driving device, a control part and a pressure adjusting part, the driving device is connected with the pressure adjusting part, at least one part of the pressure adjusting part is in threaded connection with the valve body assembly, one end of the pressure adjusting part communicates with the first cavity and is used for changing the pressure in the first cavity, and the control part is in signal connection with the driving device. The control device can control the driving device to move so as to maintain the pressure in the first cavity within a preset range; therefore, the pressure signal is used as an input signal to control the driving device to drive the pressure regulating part to rotate, accurate pressure control is achieved, and remote programmed pressure regulation of the overflow valve is completed.

The invention relates to the technical field of metal processing, and discloses a hot press molding process for metal product manufacturing, which comprises the following procedures: S1, raw material preparation, S2, mold design and manufacturing, S3, preheating treatment, S4, hot press molding, S5, cooling and demolding, S6, post-treatment and S7, packaging and storage.The process can improve the product quality, and the product quality is improved through strict raw material preparation; according to the die, impurities are removed, the size precision is ensured, a foundation is laid for high-quality products, the shape and size precision of the products is ensured, the consistency and reliability of the products are improved, the hot-press forming process is optimized, the temperature, pressure and time are accurately controlled, a die cavity is fully filled with metal materials, internal defects of the products are reduced, and the product quality is improved. The mechanical property of the product is improved, meanwhile, the production efficiency is improved, the hot press forming difficulty is reduced through the reasonable preheating treatment and the segmented pressurizing and heating mode, and the forming speed is increased.

The invention discloses an interference bushing press-in method which comprises the following steps: S1, designing and manufacturing a bushing press-in device matched with a to-be-mounted metal part in shape and structural characteristics; s2, the lining device is placed in liquid nitrogen to be frozen for 20-30 minutes, so that the magnitude of interference generated by low-temperature shrinkage of the lining device is reduced, and follow-up assembly is facilitated; s3, a to-be-mounted metal part is fixed to the stable platform, the frozen lining device is connected with the to-be-mounted metal part, and a bolt of the lining device penetrates through the to-be-mounted metal part; s4, press-in operation is conducted through the lining device, so that the shoulder lining of the metal part to be installed is attached to a gasket of the lining device, and the nut is screwed down; and S5, after press-in is completed, the lining device is removed, visual detection is conducted on the shoulder lining, and whether deflection exists or not is determined. Through the designed press-in tool, the pressure applied to the bushing can be accurately controlled, the problem that the bushing deflects due to uneven hammering force is solved, and therefore the accuracy and reliability of installation are improved.

The invention discloses a vacuum system for precisely controlling the gas density of a nano-dose detector, and belongs to the field of ionizing radiation nano-dose measurement. The system comprises a vacuum pump set unit, a vacuum degree detection unit and a logic control unit. According to the requirements of the nano dose detector for the vacuum degree and the gas concentration, the working air pressure is within 1 Torr and the air pressure control precision reaches 0.01 Torr through cooperation of a pump set in a vacuum system and PLC logic control and data monitoring. The system can provide gas for generating ionizing radiation and a low-vacuum environment for the nano-dose detector, and ensures that a measurement signal of the nano-dose detector is accurate and stable. The ionization degree of the nano dose detector depends on the vacuum degree in the cavity, and the vacuum degree of the cavity depends on the concentration of gas in the sensitive volume. The method has the advantages of high precision, high accuracy, high reliability and the like. According to the invention, the vacuum environment of the nano-dose detector is constant, the sensitive gas is single, and the precise measurement of the nano-dose detector can be supported.

The invention relates to the technical field of industrial manufacturing, and discloses an efficient cooling and shaping system for core rod production and processing, comprising: a core rod cooling path design module for designing a multi-channel cooling path inside a core rod and an external spray cooling path; the temperature sensing and monitoring module is used for collecting temperature data inside and on the surface of the core rod in real time; the intelligent control module is used for dynamically generating cooling parameters based on the target temperature and the current temperature of the core rod; and the cooling execution and feedback module is used for adjusting the flow rate of the cooling liquid, the spraying pressure and the spraying direction according to the cooling parameters generated by the intelligent control module. By optimizing an internal cooling path and an external spray cooling design of the core rod, efficient and uniform cooling is realized so as to shorten the shaping time; the precise temperature control and partition cooling technology is combined, thermal stress and deformation are effectively reduced, and the machining precision is improved; and meanwhile, the operation cost is reduced through dynamic energy consumption optimization and cooling liquid circulation, and the green and energy-saving targets are achieved.

The invention belongs to the technical field of fine chemical synthesis, and discloses a continuous micro-channel chloroethylene carbonate synthesis method, which comprises: 1, introducing a gas-state reactant into a first pipe through a gas inlet, and introducing a liquid-state reactant into the first pipe through a liquid inlet; 2, the gaseous reactant pushes the liquid reactant to enter the reaction tube of the reactor from the first tube, and a reaction is carried out under the condition that the ultraviolet lamp tube emits ultraviolet light and irradiates the reaction tube, and a gas-liquid mixture containing a target product is obtained; and 3, enabling the gas-liquid mixture to flow through a gas-liquid confluence inlet and a gas-liquid confluence outlet of a confluence device, and finally introducing the gas-liquid mixture into a gas-liquid separator for gas-liquid separation to obtain a target product. The method is simple to operate, safe and efficient, an amplification effect does not exist, and the prepared chloroethylene carbonate product is stable in quality, relatively high in yield and easy for industrial large-scale continuous production.

The invention belongs to the technical field of polyolefin, olefin products and olefin cascade polymerization reaction, and particularly relates to a cascade polymerization preparation method of branched polyethylene without inert media, the branched polyethylene and application. The invention provides a preparation method of cascade polymerization branched polyethylene without existence of an inert medium, which comprises the following steps: under the catalysis of an oligomerization-copolymerization cascade catalytic system, ethylene is oligomerized to generate even-carbon olefin, and ethylene and even-carbon olefin are copolymerized to prepare branched polyethylene, the even-number carbon olefins comprise C4 or above even-number carbon olefins; the oligomerization-copolymerization cascade catalytic system comprises an oligomerization catalyst and a copolymerization catalyst. According to the method disclosed by the embodiment of the invention, an inert medium does not need to be used, the concentration of the comonomer even-carbon olefin is high, the improvement of the insertion rate of the even-carbon olefin is facilitated, a part of oligomerization products can be simultaneously produced in the process of preparing the branched polyethylene, and the operation efficiency of a device is improved.

The utility model relates to the technical field of ceramic material testing, in particular to a novel mechanical property testing device for ceramic materials, which comprises a fixing frame, a hydraulic cylinder and a base, the base is arranged at the lower end of the fixing frame, the upper end of the base is fixedly connected with a test board through a support column, and a pressure sensor is arranged in the test board. The upper end of the pressure sensor is connected with a plurality of telescopic detection rods. Through the device, the pressure sensor in the test board can accurately measure the pressure change generated when the ceramic material is stressed, the telescopic detection rods are used for detecting the deformation condition of the material, and the plurality of telescopic detection rods enable the device to simultaneously monitor a plurality of point locations of mechanical properties, so that the test accuracy and efficiency are improved. Through arrangement of a first laser distance measuring sensor and a second laser distance measuring sensor, the device can monitor the bending deformation state of the ceramic wafer in real time after the hydraulic plate is pressed down, so that the pressure applied to the material is accurately controlled, and the accuracy of evaluating the mechanical property of the material is improved.

The invention relates to the technical field of plastic production, in particular to a control method of a PVC (polyvinyl chloride) full-automatic mixing line centralized feeding system, which comprises the following steps: acquiring each sub-domain and a melt plasticizing value of each sub-domain at each acquisition moment; the ideal melt plasticizing value of each sub-domain and the simulated melt plasticizing value of each sub-domain at the next acquisition moment are obtained respectively; obtaining the fitness of each parameter vector; in the process of obtaining the optimal parameter vector at the current collection moment, the convergence factor during each iteration passes through the convergence factor during the adjacent iteration and the closeness degree of the fitness of all parameter vectors during the adjacent iteration, and the difference of the parameter vectors between each iteration and the adjacent iteration is combined to obtain the optimal parameter vector at the current collection moment. Comparing the simulated temperature at the next acquisition moment with the preset ideal temperature for updating; and controlling the pressure of the die head of the extruder based on the obtained optimal parameter vector. The invention aims to improve the control precision of the pressure of the extruder die head.

The invention belongs to the technical field of oil and gas exploitation, and specifically provides an experimental device suitable for metal pipe column material corrosion, comprising N 2 Gas source, fluid replenishment unit, CO 2 Gas circuit unit, mixing device, high temperature and high pressure corrosion experimental device unit and supercritical fluid chromatography analysis unit, outlet of liquid replenishment unit and CO 2 The outlet of the gas circuit unit is connected to the inlet of the mixing device, and the outlet of the mixing device is connected to N 2 The outlet of the gas source is connected to the inlet of the high temperature and high pressure corrosion experimental device unit, and the supercritical fluid chromatography analysis unit is connected to the high temperature and high pressure corrosion experimental device unit, which solves the problem of studying supercritical CO in the prior art. 2 When the fluid affects the corrosion of the metal pipe string, the phase change problem is not involved, and the corrosion problem of the pipe string in the actual production conditions cannot be truly and accurately evaluated. The present invention can more truly and accurately evaluate the safety performance of the pipe string in the actual production conditions, and can also be used for in-depth research on the corrosion mechanism and the evaluation of supporting anti-corrosion measures.

The invention discloses similar test block forming equipment for a roadway similar simulation experiment and a manufacturing method. The similar test block forming equipment comprises a lower forming die, and an upper pressurizing die for pressurizing and forming a similar material in the lower die at a constant pressure is arranged above the lower forming die; and the pressurizing upper die is connected with a pressurizing control device for setting a critical pressure value during pressurizing according to mechanical parameters of the standard test block and setting a critical position to control the pressurizing upper die to move and pressurize. According to the forming equipment, similar materials are pressed and formed into required similar test blocks through the pressurizing upper die capable of providing constant pressure, so that the large mechanical property difference of the similar test blocks caused by inconsistent manual tamping mode and tamping force in the similar test block manufacturing process is avoided; therefore, the reliability and the accuracy of the experimental result of the similar simulation experiment are improved.

The utility model relates to the technical field of pressure maintaining equipment. The utility model relates to a fingerprint module bending pressure maintaining device, in particular to a fingerprint module bending pressure maintaining device which comprises an operation table, a pressure maintaining device and a pressure maintaining device. The upper end of the mounting table is provided with a fixing position used for fixing a bending jig, the mounting table is connected with the horizontal driving mechanism, and the horizontal driving mechanism drives the mounting table to move between a feeding position and a pressure maintaining position; the in-place detection mechanism is arranged on the operation table so as to detect whether the mounting table is located at a feeding position or a pressure maintaining position or not; and the pressing plate is arranged above the pressure maintaining position and is in transmission connection with the vertical driving mechanism. According to the fingerprint module bending and pressure maintaining device, the pressure maintaining pressure and the pressure maintaining time can be accurately controlled, the viscosity of a double-faced adhesive tape can be completely activated when bent steel sheets are bonded by accurately controlling the pressure maintaining pressure and the pressure maintaining time, and the hidden danger that the bonding quality of the steel sheets is loosened is reduced.

The utility model discloses a pressurizing tourniquet which comprises a tourniquet body, an air guide tube and a rubber ball. Compared with the prior art, the utility model has the advantages that: 1) rapid hemostasis: the gas filling cavity of the belt body is rapidly inflated by extruding the rubber ball, so that rapid pressurization hemostasis of a wound is realized; (2) the pressure is adjustable: the pressure in the belt body can be accurately controlled by adjusting the force for extruding the rubber ball, so that the pressurization requirements of different wounds are met; 3) firm fixation: the band body can be tightly attached to the wound through the bonding mode of the hook veneer and the loop veneer, and is not easy to loosen or fall off; 4) time is saved: the pressing time of the nurse can be obviously reduced by using the pressurizing tourniquet, so that the nurse has more time to complete other work; and (5) the risk is reduced: the risk of skin cyan and hematoma at the puncture part can be reduced through precise pressurization hemostasis.

The application discloses a leveling device and method for bridge support assembly and belongs to the technical field of bridge support assembly; the leveling device comprises a supporting frame, a conveyor and a pressure applying and leveling assembly; the pressure applying and leveling assembly applies pressure through a leveling oil cylinder, then height adjustment and state detection are realized with the help of the leveling oil cylinder and a distance sensor, and a pressure sensor is arranged between the leveling oil cylinder and a horizontal fixing plate to monitor pressure; manual operation is replaced by mechanical automation, the efficiency of bridge support assembly is remarkably improved, accurate measurement and control are realized through the sensor, human errors are avoided, leveling precision and assembly quality are improved, human cost and labor intensity are reduced, and reliable guarantee is provided for bridge support assembly.

The invention provides a liquid viscosity measuring device and method.The device comprises a measuring container used for containing liquid to be measured, the top face of the measuring container is in a cone shape extending outwards, a closed control cavity is formed in the top end of the measuring container, and the inner diameter of the control cavity is smaller than the diameter of a measuring steel ball; the measuring steel ball is arranged in the measuring container; the rotating mechanism is used for driving the measuring container to rotate by 180 degrees around the horizontal axis of the measuring container, so that the measuring container is switched between an upright state and an inverted state; one end of the control cavity is directly communicated with the interior of the measuring container, the other end of the control cavity is communicated with the interior of the measuring container through a first pipeline provided with a first stop valve, and the other end of the control cavity is further provided with a pressure relief device used for adjusting the internal pressure of the control cavity. According to the invention, the ball falling time can be accurately measured, so that the liquid viscosity measurement precision is improved.

The application discloses an automatic assembling equipment for a gearbox filter element, which comprises a pre-assembling assembly, a pressing assembly and a conveying assembly. The pre-assembling assembly comprises a bottom disc and an extruding assembly arranged above the bottom disc. The bottom disc is rotatable, and at least one standby work station, a pre-assembling work station and a discharging work station are arranged on the bottom disc. The extruding assembly comprises a support, a driving assembly fixed on the support and a pair of side pressing blocks. The side pressing blocks are arranged on the two sides of the pre-assembling work station. The side pressing blocks are driven by the driving assembly to move towards the gearbox filter element and extrude the side surface of the plate element. The side surface of the plate element is deformed by the extrusion of the side pressing blocks and buckles the upper surface of the cover plate. The pressing assembly is used for pressing the cover plate on the plate element. The conveying assembly is used for transferring the gearbox filter element at the discharging work station to the pressing assembly. The automatic pre-assembling of the gearbox filter element is realized, the degree of automation is high, the manual participation is less, and the production efficiency is improved.

The invention belongs to the technical field of welding equipment, and particularly relates to a dish-washing machine liner automatic seam welder which is used for welding an outer cover and a top cover into an integrated shell and comprises a base, a horizontal pushing mechanism, a locking mechanism, a left-right translation mechanism, a front-back translation mechanism, a seam welding mechanism and a jacking mechanism. A material placing table is arranged at the upper end of the base, a supporting table is arranged at the lower end of the base, the outer cover surrounds the side wall of the material placing table, and the top cover is placed at the top end of the material placing table and covers the outer cover. And the horizontal pushing mechanism is used for tightly attaching the outer cover to the side wall of the material placing table. The locking mechanism applies force to enable the top cover to be attached to the outer cover. The left-right translation mechanism drives the base to translate left and right. The execution end of the front-back translation mechanism moves around the joint of the top cover and the outer cover. The roll welding mechanism is arranged at the execution end of the front-back translation mechanism and rotatably welded to the joint of the outer cover and the top cover. The jacking mechanism is arranged on the base and used for jacking out the formed shell for demolding.

The utility model discloses a silk screen printing machine convenient to remove, include: mobile box, top fixed support, top fixed support installs at the top of mobile box, the top fixed support on the sliding setting is limited slide, the utility model has the beneficial effect is: equipment bottom integrated liftable mobile wheel, drives the adjustment screw through servo motor, drives the inner sliding board along no.

The invention belongs to the technical field of conical valves, and particularly relates to a conical valve stock bin feeding and discharging connection system which comprises a control system module, an electrical module, an electric module, a communication module, a PLC control module, an automatic discharging module, an AGV automatic navigation system module and an HMI module. The control module is connected with the electrical module and the electric module through signals; in the process, the vibrator is used for driving the conical valve in the movable stock bin to move up and down, the anti-blocking effect of the movable stock bin in the discharging process can be achieved, the discharging smoothness is improved, and the discharging speed is increased. The pneumatic system must have good sealing performance, dust can be effectively prevented from leaking in the discharging process, and components in the pneumatic system are protected from being affected by the dust by arranging the sanitary cover.

This utility model discloses a movable base for a lifting platform, relating to the field of lifting platform mobility technology. It includes a base with a support frame movably connected to one side, a tire fixedly connected to the bottom of the base, and a support assembly at the bottom of the base. The support frame includes a connecting block, one side of which is fixed to one side of the base. Upon activation of the support frame, the support frame drives a transmission rod to move within the connecting block, thereby causing a limiter and a fixed column to move synchronously. At this time, the adjusting screw rotates, and using a threaded structure, the fixed column drives the adjusting column to move up and down along its inner wall. The adjusting column then drives the support base plate to move downwards, causing the support base plate to tightly press against the ground and achieve stable fixation. This process, through mechanical linkage and threaded adjustment, precisely controls the position and pressure of the support base plate, providing reliable support for the overall equipment, effectively enhancing equipment stability, reducing the risk of shaking and displacement, and ensuring normal equipment operation.

The utility model discloses a kind of slurry flow control system for shield machine and shield machine with it, comprising: the slurry cabin of being laid in the shield body of shield machine, and the transition cabin, grouting system and slurry discharge system of being laid outside shield machine, and air pressure control system. Transition cabin is equipped with liquid level detector for detecting the liquid level in it and first pressure detector for detecting the pressure in it, and transition cabin is connected with air pressure control system to adjust the air pressure in it, and transition cabin is also connected with slurry cabin, to control slurry cabin pressure by slurry pressure and air pressure in transition cabin, and then make slurry cabin pressure match face water and soil pressure. Transition cabin and slurry cabin are also connected with grouting system to inject slurry respectively, and slurry cabin is also connected with slurry discharge system to discharge slurry outward. The new system can ensure the stability of liquid level and air pressure in transition cabin, and then control the stability of slurry cabin pressure, so that slurry cabin pressure matches face water and soil pressure.

The invention relates to the technical field of electromagnetic valves, in particular to a pressure regulating electromagnetic valve and a control method thereof.The pressure regulating electromagnetic valve comprises a valve seat, an electromagnetic valve assembly and a pressure regulating assembly, and the pressure regulating assembly comprises a connecting seat, a connector and a flow guide pipe; a first annular flow guide cavity is formed between the inner wall of the connecting base and the flow guide pipe, a plurality of guide sliding blocks distributed corresponding to the guide sliding grooves are arranged on the flow guide pipe in the circumferential direction, and elastic pieces are arranged at the two ends of each guide sliding block; the flow guide pipe is provided with a first channel along the axis, a drainage pipe formed by extending the end, away from the connector, of the flow guide pipe and the inner hole wall of the inlet end form a second annular flow guide cavity, and the first annular flow guide cavity and the second annular flow guide cavity are communicated to form a second channel. When the electromagnetic coil is electrified, the end part of the flow guide pipe is propped against the end surface of the connector to control the closing of the second passage. Through the arrangement of the flow guide pipe, the flow of a medium is controlled, accurate pressure control is achieved, the situation that components in the electromagnetic valve body are damaged by too high pressure is prevented, and the service life of the electromagnetic valve is prolonged.

The utility model relates to a device for pasting hot melt adhesive on a mobile phone outer frame, which comprises a hot melting tool, the hot melting tool is arranged on a bottom plate and comprises a plurality of pushing and pressing heating groups, the pushing and pressing heating groups are distributed in a radial shape, each pushing and pressing heating group comprises a heating part and a moving part, the front end of each heating part is arranged at a radial concentrated end, and the moving part is arranged at the tail end of each heating part. The moving part drives the heating part to move linearly, and the pushing and pressing heating set is used for heating the outer side of the mobile phone outer frame bonded with the hot melt adhesive. The utility model relates to the technical field of mobile phone shell processing equipment. The device can be matched with a control system for use, so that the hot melt adhesive is prevented from being activated, and meanwhile, the hot melt adhesive is attached to a mobile phone shell.

The utility model discloses a gas-liquid separator and a corresponding compressed air system, and the gas-liquid separator comprises a primary gas-liquid separation column, a secondary gas-liquid separation column and a secondary gas-liquid separation column, the second-stage gas-liquid separation column is parallel to the first-stage gas-liquid separation column and is provided with a gas outlet pipeline; the liquid conveying pipe is communicated with the first-stage gas-liquid separation column and the second-stage gas-liquid separation column; the first gas conveying pipe is higher than the liquid conveying pipe and is communicated with the first-stage gas-liquid separation column and the second-stage gas-liquid separation column; the position of the second gas conveying pipe is higher than that of the first gas conveying pipe, and the first-stage gas-liquid separation column and the second-stage gas-liquid separation column are communicated; the first waterproof net is arranged in the first-stage gas-liquid separation column and is higher than the gas inlet pipeline; the second waterproof net is arranged in the second-stage gas-liquid separation column and is higher than the first gas conveying pipe and lower than the second gas conveying pipe; and the third waterproof net is arranged in the second-stage gas-liquid separation column and is higher than the second gas conveying pipe. The gas-liquid separation device has the advantages that the gas-liquid separation effect can be effectively achieved in time, and facility faults caused by the fact that liquid water rushes upwards along with air in gas equipment are avoided.

This invention discloses a smart meter durability testing device, belonging to the field of meter testing technology. It includes a test stand, on which a simulation test unit, a tightening variable control unit, and a data observation unit for detecting test results are installed. This invention uses high and low temperature testing, damp heat cycling testing, and salt spray corrosion testing modules in the simulation test unit to simultaneously simulate multiple extreme environments, accurately assessing the durability of the meter under complex operating conditions. Through a magnetically controlled connector combined with a tightening motor, the tightening stroke and pressure of the terminal screws can be precisely controlled, thereby exploring the impact of different tightening forces on the durability of the smart meter's terminals. A digital display power monitor synchronously records power consumption with the smart meter, directly comparing the test data with the actual value to quickly identify metering deviations. A camera periodically captures data from the display screen, tracking the meter's performance changes at different test stages and accurately locating the time point of failure.

The utility model relates to an efficient movable graphene filter pressing device. The filter pressing device comprises a frame, a pneumatic control unit, a filtering assembly and a moving assembly, the frame comprises a bottom panel, a middle supporting plate and an outer frame; the pneumatic control unit comprises a supporting pneumatic triple piece, a reversing valve, an air cylinder, a floating connector, an ejector block and a push disc. The ejector block is fixed to the bottom of the air cylinder, the ejector block pushes the push disc, the pneumatic triple piece, the reversing valve and the air cylinder are installed on the outer frame, and the filtering assembly comprises a filtering barrel, a filtering plate, a guide cover and a waste liquid collecting barrel; the filter plate is installed at the bottom of the filter barrel, the guide cover is located between the filter plate and the waste liquid collecting barrel, the filter barrel is detachably installed on the middle supporting plate, and the waste acid collecting barrel is placed on the bottom panel. The structure is more optimized, the floating joint compensates installation errors, and the system stability is improved; the safety is good; the filter plate is matched with the guide cover, so that the filter plate is quickly disassembled and assembled, and the maintenance cost is reduced; and the equipment can move and is good in stability.

The utility model provides a down-the-hole drill control device with PWM (Pulse-Width Modulation) output and feedback detection functions, which is characterized by comprising an embedded microprocessor, the power supply circuit, the key input circuit, the TFT color screen display module, the EEPROM storage module, the drilling machine start-stop control output circuit, the drilling machine analog quantity sampling circuit, the alarm protection output circuit, the hydraulic valve control input circuit, the hydraulic valve PWM drive control output circuit and the hydraulic valve PWM drive control feedback detection circuit are respectively connected with the embedded microprocessor. According to the utility model, the PWM is used for outputting modulation signals, digital signals are used for controlling the electric control hydraulic proportional valve, feedback detection on load current is added, comparison with a set target current value is carried out, modulation compensation is carried out on the output signals in real time, overshoot or insufficiency is prevented, the control signals are stable, and the control precision is improved. Therefore, flow and pressure output by the electric control hydraulic proportional valve are accurately controlled, and hydraulic driving equipment is accurately controlled.

The application relates to a purging device for a liquid preparation system and relates to the technical field of medicine liquid preparation. In order to solve the problem that a traditional purging device cannot completely purge, the purging device comprises a conveying pipeline, the inlet end of the conveying pipeline is provided with a compressed air supply source, the outlet end of the compressed air supply source is sequentially and serially provided with a pressure reducing valve and an electric heater along the conveying pipeline, a plurality of heating modules are arranged in the electric heater, the plurality of heating modules are vertically stacked along the height direction of the electric heater, a heating channel is formed in the electric heater from bottom to top, and a temperature gradient from low to high is formed when the compressed air flows through the heating channel. The application has the effects of effectively stripping the residual moisture on the surface of the system, improving the removal rate of the residual moisture and solving the microbial pollution risk caused by incomplete purging.