295results about How to "Control pressure" patented technology

The invention relates to the technical field of two-way sealing butterfly valves, in particular to a condenser cut cylinder two-way sealing butterfly valve which comprises a valve body, a valve rod and a valve plate, a driving cavity is formed in the valve body, the valve rod is sleeved with a transmission piece, two sliding blocks are arranged in the driving cavity, and expansion rings are arranged below the two sliding blocks. A runner is arranged between the expansion ring and the sliding block on the valve body; a first sealing groove is formed in the valve plate, the transmission piece is driven through rotation of the valve rod, and the two sliding blocks are driven to slide through the transmission piece. The sliding block moves to drive fluid in the flow channel to flow, the expansion ring is driven to expand towards the first sealing groove of the valve plate, the expansion ring is tightly attached to the first sealing groove through deformation, and sealing of the valve body is achieved. Compared with the prior art, through the more compact structure and space layout, a sealing mechanism is simplified, and the requirements of an external transmission assembly and a complex adjusting mechanism are reduced, so that the overall size of the valve is effectively reduced, and the problem that side space is occupied is avoided.

The embodiment of the invention provides a control method of an oxygen generation system and an adjustable oxygen generation system, and belongs to the technical field of medical instruments. The control method of the oxygen generation system comprises the steps that 1, the threshold value interval of a pulse rate normal value and the threshold value of an oxyhemoglobin saturation normal value are obtained; 2, receiving a pulse rate monitoring value and a blood oxygen saturation monitoring value of a user of the oxygen generation system; 3, according to the threshold value interval, the threshold value, the received pulse rate monitoring value and the received oxyhemoglobin saturation monitoring value, the oxygen output quantity of the oxygen generation system is controlled, and the oxygen output quantity is the oxygen generation pressure and / or the oxygen output rate. According to the method, the performance parameters of the oxygenerator can be timely and automatically adjusted according to the physiological parameter change of the user of the oxygenerator, so that the requirements of the user at the current moment are met.

The invention provides a pressure-controllable chip mounting head. The pressure-controllable chip mounting head comprises a vertical driving assembly, a first-stage sliding assembly and a second-stage sliding assembly, the first-stage sliding assembly comprises a first-stage sliding table; the second-stage sliding assembly comprises a second-stage sliding table; a hollow rotating shaft is rotatably mounted in the secondary sliding table, and a suction head is fixed at the bottom of the hollow rotating shaft; a spring assembly is mounted between the first-stage sliding table and the second-stage sliding table; a grating ruler is fixed on the first-stage sliding table, and a reading head is fixed on the second-stage sliding table at a position corresponding to the grating ruler; the spring assembly comprises an extension spring and an adjusting spring assembly, and the extension spring is connected with the first-stage sliding table and the second-stage sliding table so that the second-stage sliding table can be hung below the first-stage sliding table. The adjusting spring assembly comprises a spring guide column, the top of the spring guide column is fixed to the first-stage sliding table, and the bottom of the spring guide column is inserted into the second-stage sliding table in a sliding mode. And a large spring and a small spring are sleeved on the spring guide post. The pressure control difficulty is low, the technical threshold is low, and the chip mounting head is small in overall structure and low in cost.

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 utility model relates to an electromagnetic pulse valve, which belongs to the technical field of electromagnetic valves and comprises a valve body and a valve cover, the valve body is fixedly connected with the valve cover, a diaphragm is arranged at the joint of the valve body and the valve cover, a positioning device is further arranged on one side of the diaphragm close to the valve cover, and the positioning device is arranged on one side of the diaphragm close to the valve cover. The diaphragm is connected with the positioning column, when the diaphragm is opened and closed, the positioning column slides in the sliding groove, the limiting block arranged on one side of the sliding groove is matched with the clamping groove formed in the positioning column, the opening degree of the diaphragm can be accurately controlled, and the flow and pressure of gas in the electromagnetic pulse valve are further controlled.

The invention relates to 3D micro-fluidic printing equipment which comprises a base, a supporting seat and a supporting arm are installed on the upper surface of the base, a bottom plate used for containing a printed product is arranged on the upper surface of the supporting seat, a spray head support is movably arranged on the front side of the supporting arm, and a 3D micro-fluidic printing spray head is fixedly connected to the bottom end of the spray head support. And a boss is arranged on the front side of the 3D micro-fluidic chip. According to the invention, gas and a material are respectively introduced into the 3D micro-fluidic chip through the inlet A and the inlet B, and after the gas and the material in the bubble generation layer are converged, the material containing a large number of bubbles is generated and is used for printing the porous piezoelectric gel; by adjusting the depths of bolts in a continuous-phase threaded hole A, a continuous-phase threaded hole B, a continuous-phase threaded hole C, a continuous-phase threaded hole D, a dispersed-phase threaded hole A, a dispersed-phase threaded hole B, a dispersed-phase threaded hole C and a dispersed-phase threaded hole D, the pressure of gas and the flow of materials are controlled, and porous piezoelectric gels with different porosities can be prepared. And the piezoelectric material has different piezoelectric properties.

The invention discloses a hydraulic oil cylinder high-speed oil supplementing system and an injection molding machine, and belongs to the technical field of injection molding machine hydraulic systems, the hydraulic oil cylinder high-speed oil supplementing system comprises an oil cylinder, a control oil way, an oil supply loop and an oil tank, the control oil way is communicated with the oil cylinder, one end of the oil supply loop is communicated with the control oil way, and the other end of the oil supply loop is communicated with the oil tank; the control oil way comprises a first cartridge valve, a second cartridge valve, a third cartridge valve, a fourth cartridge valve, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, one end of the first cartridge valve is communicated with a rodless cavity of the oil cylinder, the other end of the first cartridge valve is communicated with the oil tank, one end of the second cartridge valve is communicated with the rodless cavity of the oil cylinder, and the other end of the second cartridge valve is connected with the oil supply loop. The first electromagnetic valve controls opening and closing of the first cartridge valve and the second cartridge valve, the first cartridge valve and the second cartridge valve act asynchronously, one end of the third cartridge valve is communicated with a rod cavity of the oil cylinder, the other end of the third cartridge valve is connected with an oil supply loop, one end of the fourth cartridge valve is communicated with a rod cavity of the oil cylinder, and the other end of the fourth cartridge valve is connected with an oil tank. The second solenoid valve controls opening and closing of the third cartridge valve, the third solenoid valve controls opening and closing of the fourth cartridge valve, the third cartridge valve and the fourth cartridge valve act asynchronously, and the four cartridge valves are combined directly to control oil inlet and oil return of the oil cylinder, so that the length of the moving distance of hydraulic oil is shortened, and the flowing resistance of the hydraulic oil is reduced; and the action sensitivity of the oil cylinder is improved, so that the production efficiency is improved.

The invention discloses a pressure limiting protection type integrated aviation plunger pump oil distribution cover assembly. A plug, a filter element, a filter seat, a pressure valve component and a control valve component are sequentially and coaxially arranged in an oil distribution cover. The one-way valve component is communicated with the pump shell and the oil inlet during overpressure; an annular groove is formed in the periphery of the filter element and communicated with a pump outlet, and a filter hole is formed in the radial direction and communicated with the annular groove and an internal oil filter cavity. A boss is arranged at the front end of a valve sleeve of the pressure valve component and tightly attached to the filter seat, and a flow guide groove is formed in the periphery. The flow guide groove at the foremost end is communicated with the oil filter cavity through the boss and a flow channel in the filter seat; a through hole is radially formed in the valve sleeve to communicate the diversion trench with the internal cavity; the valve element is located in the cavity, two annular grooves are formed in the periphery, a blind hole is formed in the front end face and communicated with the annular groove in the front end through the flattened position on the valve element, and a limiting shoulder is arranged at the rear end. The control valve component can apply an axially forward and adjustable force to the valve element. Pressure limiting protection, automatic oil supplementing and adjustable oil pressure can be achieved.

The invention relates to the technical field of solar frame machining, in particular to an aluminum profile solar frame sand blasting device which comprises a fixing support, machining box side plates are fixedly arranged on the two sides of the fixing support, and the two machining box side plates are symmetrically distributed about the central axis of the fixing support. Two first guide rails and a rack are fixedly arranged on the sides, close to each other, of the two machining box side plates, the rack is located in the middle of the fixing support, the two first guide rails are located in the two side directions of the rack respectively, first sliding blocks are arranged on the first guide rails in a sliding mode, and a vertical moving plate is fixedly arranged on the four first sliding blocks jointly. By controlling the fourth motor and the third motor, the sand blasting gun head can be driven to carry out comprehensive and uniform sand blasting treatment on the solar frame, the same sand blasting pressure can be kept to carry out sand blasting operation on the solar frame, the attractiveness and the use performance of the solar frame can be improved, and the sand blasting uniformity can be greatly 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 utility model relates to the technical field of thermal management of vehicles, in particular to a thermal management system of a vehicle and the vehicle, and aims to solve the problem that the heating capacity of a thermal management system of an existing new energy vehicle is insufficient in a low-temperature environment. Therefore, the heat management system comprises a compressor, an air conditioning box assembly and a gas-liquid separator, the two ends of the air conditioning box assembly are communicated with an exhaust port of the compressor and an inlet of the gas-liquid separator respectively, an outlet of the gas-liquid separator is communicated with an air return port of the compressor, and the heat management system further comprises a circulating pipe connected with the air conditioning box assembly in parallel. By arranging the circulating pipe, the compressor and the gas-liquid separator form a self-circulation heating loop, so that the compressor can cyclically compress a refrigerant in the self-circulation heating loop, the compression density and the compression temperature of the refrigerant are improved, the flow and the temperature of the refrigerant entering the air conditioning box assembly are improved, and the service life of the air conditioning box assembly is prolonged. The heating capacity of the thermal management system of the vehicle in the low-temperature environment is improved, and the use experience of a user is improved.

The invention belongs to the technical field of blast furnace ironmaking in the ferrous metallurgy industry, and relates to a pulverized coal bunker pressure control method and device of a blast furnace coal injection system. By establishing an injection tank pressure relief control model and a pulverized coal bunker pressure control model, the pulverized coal bunker pressure is adjusted through the two models in the injection tank pressure relief execution period; the pressure of the pulverized coal bunker is accurately controlled to be in a micro-negative pressure state. The system has the advantages that the pressure of the pulverized coal bunker is accurately controlled, stable production of the system can be guaranteed, independent production of the coal pulverizing system and the injection system can be achieved, meanwhile, the automatic control level of the system is greatly improved, the workload of operators is reduced, and remarkable technical and economic benefits are achieved.

The invention discloses a cooling system for a fuel cell and a control method of the cooling system, and the cooling system comprises: a material storage box for storing a heat exchange medium; the first medium flow path is communicated with the material storage box and is also suitable for being communicated with a cell inlet of the fuel cell, and the first medium flow path is provided with a driving pump; the second medium flow path is communicated with the material storage box and is also suitable for being communicated with a cell outlet of the fuel cell, and the second medium flow path is provided with a pressure regulating valve; and the bypass flow path is connected between the first medium flow path and the second medium flow path and is provided with a flow regulating valve. Therefore, the pressure in the cooling system can be controlled by controlling the opening degree of the flow regulating valve on the bypass flow path, controlling the flow of the heat exchange medium flowing into the fuel cell and controlling the pressure regulating valve on the second medium flow path, so that the flow and the pressure in the cooling system are controlled together.

The utility model discloses a biogas purifying, absorbing and filtering device which comprises a filtering tank, a hydraulic cylinder is installed on the lower portion of the inner side of the filtering tank, a hydraulic rod is installed above the hydraulic cylinder, a movable plate is movably connected above the hydraulic rod, a filter element is installed above the movable plate, a partition plate is fixed above the filter element, and the partition plate is connected with the hydraulic cylinder. An air inlet pipe is installed on one side of the filtering tank, a first fixing disc is installed on one side of the air inlet pipe, and the outer side of the first fixing disc is sleeved with a hoop; according to the biogas purifying, absorbing and filtering device, the hoop, the sealing ring and the first bolt are arranged, the hoop is fixed to the outer side of the sealing ring through the first bolt in the using process of the device, the sealing ring seals the connecting position of the biogas inlet pipe, and biogas can be effectively prevented from leaking outwards; safety accidents such as poisoning can be caused by biogas leakage, safety hazards to workers are reduced, and biogas leakage is prevented so that production safety can be guaranteed.

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 discloses a convection stirring device for fermented biogas slurry, which comprises a fermentation tank, the upper end of the fermentation tank is in threaded connection with an upper cover, the inner wall of the upper cover is fixedly connected with a gas collecting pipe, the gas collecting pipe is provided with a filter screen, the upper end of the upper cover is fixedly connected with a gas pump, and the gas pump is provided with a gas outlet. One end of the air pump is fixedly connected with a third circulating pipe, the lower end of the third circulating pipe is fixedly connected with a diverter valve, and the diverter valve is fixedly connected with the outer wall of the fermentation tank. According to the biogas fermentation device, the gas pump can pump biogas generated by fermentation through the gas collecting pipe when being started, so that the biogas is sprayed out of bubbles from the spray head through the third circulating pipe, the diverter valve, the second circulating pipe and the fermentation tank, the stirring efficiency is improved by matching with the second stirring blade and the third circulating pipe, and the biogas in the second circulating pipe is more and more along with the fermentation process; and when the air pressure is enough, the methane in the main pipeline pushes the rubber plug to move upwards to compress the spring.

The invention discloses a nonmetal composite coiled tubing string downhole throttling device, a control circuit and an operation method.The nonmetal composite coiled tubing string downhole throttling device comprises a valve body, a throttling assembly and a power assembly; the throttling assembly comprises a throttling nozzle, a first elastic piece and a transmission piece. A flow channel is formed in the valve body; the throttling nozzle is arranged in the valve body, one end of the throttling nozzle slides in the flow channel, and the throttling nozzle is configured to adjust the opening size of the flow channel; the other end of the throttling nozzle is connected with one end of the transmission part; the other end of the transmission part is connected with the output end of the power assembly, and the fixed end of the power assembly is connected with the valve body. The first elastic piece is arranged on the transmission piece in a sleeving mode, one end of the first elastic piece abuts against the throttling nozzle, and the other end of the first elastic piece abuts against the end face of the transmission piece. The underground throttling device is subjected to stepless regulation on the ground, so that the pressure and the yield of a wellhead are controlled, the oilfield exploitation efficiency is also improved, and the cost is reduced.

The invention discloses a mechanical spiral shaft sealing device, which relates to the technical field of shield tunneling construction, and comprises an optical shaft and a smooth shaft section arranged at the middle section of a spiral shaft, the cylinder body is sleeved outside the polished shaft, and a slag discharging channel is formed between the cylinder body and the polished shaft; the sealing piece is arranged in the cylinder body and can be expanded in the radial direction of the cylinder body to seal the slag discharging channel; and the gate movably penetrates into the cylinder body to fold and unfold the sealing piece. According to the mechanical spiral shaft sealing device, spiral blades are not welded to the polished shaft section, muck is not affected by a lead angle on the polished shaft section, the muck can be passively extruded on the polished shaft section, the soil plug effect is formed, and a certain water gushing blocking effect is achieved; when necessary, the gate and the deslagging channel can be closed, the purpose of completely blocking gushing water is achieved, the problem that the internal construction environment of the earth pressure balance shield tunneling machine is polluted by muck gushing in the water-rich stratum construction of the earth pressure balance shield tunneling machine can be effectively solved, the pressure stability of an earth bin is guaranteed, and then the tunneling safety of equipment is guaranteed.

The invention relates to a method for preparing a fluorine-doped tin oxide transparent conductive film through ultrasonic atomization and application of the fluorine-doped tin oxide transparent conductive film, adopted fluorine-doped tin oxide transparent conductive film spraying liquid comprises the following components: a tin source, alcohol, a fluorine-containing dopant and lithium hydroxide, and the pH value of the spraying liquid is 2.0 or above. Therefore, the acidity is lower than that of the traditional film, the microdefect of the film layer can be improved, the surface roughness of the film is reduced, the gas adsorption capacity of the film layer is reduced, and the film resistor stability is improved. According to the preparation method, the combination of trifluoroacetic acid and lithium hydroxide is innovatively adopted, the acidity is reduced and controllable, the film forming thickness is controllable, the fluorine doping level is high, the problems of film growth and corrosion of coating equipment can be well solved, and conditions are provided for preparation of a high-quality FTO film.

The invention relates to the field of nuclear energy heat supply, in particular to a method and system for adjusting and controlling the industrial steam supply quality of a nuclear power plant. The system is characterized in that a heat supply main steam pipeline system is respectively connected with four rows of steam conversion equipment, and each row of steam conversion equipment comprises a superheater, an evaporator, a preheater, a water feeding pump and an industrial water tank which are connected in sequence. According to the method, adjustment control is carried out based on the system, and the adjustment control comprises control under the four conditions of normal operation, starting, normal shutdown and operation under the accident or fault condition. High-quality steam supply is achieved, the quality and reliability of gas supply are improved, and the requirement for industrial gas supply is met.

The utility model provides a temperature regulating system of a compressed air energy storage chamber, which comprises an artificial chamber horizontally arranged underground, a vertical shaft arranged at the top of the artificial chamber, an air circulating pipeline and a water pipeline, the air circulating pipeline and the water pipeline are arranged in the artificial chamber, and an air inlet and an air outlet at two ends of the air circulating pipeline are oppositely arranged along two sides of the artificial chamber respectively. An axial flow fan is arranged in an air inlet of the air circulating pipeline, the water pipeline comprises a water inlet pipeline and a water outlet pipeline, the water inlet pipeline is communicated with a water outlet of the warm water tank and an in-plant circulating cooling water inlet, the water outlet pipeline is communicated with a water inlet of the cold water tank and an in-plant circulating cooling water return port, and a spiral heat exchange pipe is arranged between the water inlet pipeline and the water outlet pipeline. The spiral heat exchange pipe is embedded in the air circulation pipeline behind the axial flow fan and used for exchanging heat with air in the chamber, adjusting the temperature of the air in the artificial chamber during inflation energy storage and deflation energy release, guaranteeing the structural safety of surrounding rock around the artificial chamber and prolonging the service life of sealing materials in the chamber.

The invention relates to the field of chemical engineering, and discloses a micro-channel reactor, a micro-channel reaction device and a micro-channel reaction method. The micro-channel reactor comprises a gas phase plate and a micro-channel reaction plate which are stacked in the first direction, a plurality of gas phase chambers which are isolated from one another are formed in the side, facing the micro-channel reaction plate, of the gas phase plate, and a plurality of gas inlets communicated with the gas phase chambers are formed in the gas phase plate; a plurality of micro-channel areas communicated with fluid are formed on one side, facing the gas phase plate, of the micro-channel reaction plate, the plurality of micro-channel areas and the plurality of gas phase chambers are arranged in a one-to-one correspondence manner, the arrangement direction of the plurality of micro-channel areas is consistent with the flowing direction of the fluid, and a microporous membrane is arranged between each micro-channel area and the corresponding gas phase chamber in a sealing manner. The micro-channel reactor disclosed by the invention has the advantages of small volume, simple structure, good mixing effect and high reaction efficiency.

The invention relates to the technical field of vehicle control, and provides a clutch oil pre-charging control method and device. The method comprises the steps that the current gearbox oil temperature, the accelerator pedal opening degree and the clutch front and rear end rotating speed difference of a vehicle are obtained; determining an oil pre-charging step target current of the clutch according to the oil temperature of the gearbox, and determining the step maintaining duration of the oil pre-charging step target current according to the opening degree of the accelerator pedal and the oil temperature of the gearbox; according to the oil temperature of the gearbox and the rotating speed difference of the front end and the rear end of the clutch, the target maintaining duration of the pre-charging oil maintaining target current of the clutch is determined, and the pre-charging oil maintaining target current is the current corresponding to the expected pressure of the clutch; and under the condition that clutch oil pre-charging control activation is detected, the clutch is controlled to maintain the step maintaining duration for the oil pre-charging step target current, and the clutch is controlled to maintain the target maintaining duration for the oil pre-charging maintaining target current. According to the invention, the efficiency and smoothness of the whole switching process are improved.

The technical scheme belongs to the field of cutting and slitting machines, and particularly relates to a cutting device of a cutting and winding machine, which comprises a rack, the rack is provided with a cutting mechanism, the cutting mechanism comprises a first knife roll and a second knife roll which are rotatably arranged relative to the rack, the two knife rolls are tangent and matched, and a paper material passes between the first knife roll and the second knife roll; the strip cutting driving part is used for driving the first knife roll to rotate so as to be matched with the second knife roll to cut the paper material into a plurality of material strips; the pressing adjusting assembly comprises an adjusting rod in threaded fit with the first knife roll, the adjusting rod rotates to drive the first knife roll to move relative to the second knife roll, the slitting driving part drives the first knife roll to rotate, and the paper material is continuously cut into material strips when passing through a channel formed by tangency of the first knife roll and the second knife roll; an adjusting rod of the pressing adjusting assembly accurately controls axial displacement of a first knife roll through thread transmission, stepless adjustment of a paper material channel is achieved, the cutting precision is kept, and the adaptability of paper materials of different thicknesses and the equipment maintenance efficiency are improved.

The application discloses a digital oscilloscope variable sampling rate acquisition and storage device, which comprises a data acquisition module, an upper computer, a data preprocessing module and a data cache module. The data acquisition module acquires data and sends the data to the data preprocessing module. The upper computer sets a threshold start position, a threshold end position and a sampling rate increase multiple according to user needs, and sets parameters for the data preprocessing module and the data cache module. According to control signals of the upper computer and the data cache module, the data preprocessing module changes the data extraction multiple, thereby changing the data sampling rate, and sends the data after the extraction to the data cache module. The data cache module caches the data, and sends control signals to the data preprocessing module according to the data cache condition. The application can adopt the variable sampling rate in the same waveform data, so that the user can observe the waveform details without wasting the storage space.

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 present invention provides a suction valve, an endoscope unblocking structure, an endoscope handle and an endoscope, and belongs to the technical field of endoscopes. The suction valve includes a valve body and a valve stem, a valve cavity is arranged in the valve body, the valve cavity includes a sealing cavity and a suction cavity connected to each other, the valve body has a negative pressure channel and an atmospheric channel connected to the valve cavity, the valve stem has a blocking end, and the blocking end is movably arranged in the valve cavity; when the blocking end moves in the sealing cavity, the circumferential side wall of the blocking end contacts and cooperates with the circumferential side wall of the sealing cavity, and the blocking end is in a closed position; when the blocking end moves in the suction cavity, there is a gap between the circumferential side wall of the blocking end and the circumferential side wall of the sealing cavity, and the blocking end is in a suction position. The present application sets a sealing cavity with a certain axial length. When the suction valve is installed in the instrument channel and the instrument channel is sealed, the internal pressure of the instrument channel is adjusted by controlling the position of the blocking end in the sealing cavity, so as to push the stones blocking the instrument channel to move and open the instrument channel.

The invention discloses an edge grinding device for glass ceramic processing, and relates to the technical field of universal grinding machines, the edge grinding device comprises a glass fixing mechanism and a fixing suction cup mounted at the top of the glass fixing mechanism, an edge grinding dust collection mechanism is arranged at the top of the glass fixing mechanism, and edge grinding equipment is arranged in the edge grinding dust collection mechanism; the glass fixing mechanism comprises an edge grinding workbench, a glass fixing groove is formed in the center of the interior of the edge grinding workbench, a fixing block is fixedly installed in the glass fixing groove, and a fixing supporting rod is fixedly installed on the outer side, close to the glass fixing groove, of the edge grinding workbench. According to the device, the fixed suction cup can be closed, so that glass ceramics are adsorbed and fixed through the fixed suction cup, and when the glass ceramics need to be moved, the moving roller in the roller support can jack up the glass ceramics, so that the movement of the glass ceramics is facilitated.

The invention relates to the technical field of electric contact pressure gauges, and discloses an adjustable pressure gauge and an electric contact signal connecting device. A C-shaped bourdon tube is arranged at the center point of the C-shaped bourdon tube with the center position of a cavity of an outer shell as the circle center, one end of the C-shaped bourdon tube is fixedly connected with an outer connector, and the other end of the C-shaped bourdon tube is connected with a pointer adjusting mechanism; the pointer adjusting mechanism is connected with the pointer assembly, the pointer assembly can be adjusted by finely adjusting the pointer adjusting mechanism, the outer connector is provided with a cavity adjusting nut which is used for adjusting the pressure in the pressure gauge by controlling the size of the inner volume of the outer connector, and the pressure in the pressure gauge can be effectively controlled to be adjusted by a pressure making system. Meanwhile, the outer shell of the pressure gauge is provided with the electric contact circuit device, and is connected with a digital multimeter or a loudspeaker battery pack through the electric contact circuit device, thereby effectively simplifying the signal connection of electric contacts, and facilitating the detection of a user.

The invention relates to a preparation method of a low-heat-shrinkage sausage casing for a fermented flavor sausage and the prepared sausage casing. The preparation method comprises the following steps: an artificial aerated collagen casing dried at a low temperature is guided to a heat transfer unit, the artificial aerated collagen casing has water accounting for 5-15% of the total weight of the casing, the thermal decomposition risk of the obtained thermal shrinkage casing is reduced, and the artificial aerated collagen casing has internal gas pressure of 20-1000 Pa; and at the temperature higher than the shrinkage temperature of the collagen casing, the heat transfer unit transfers high heat energy to the casing instantly so as to obtain the artificial collagen casing with low heat shrinkage. The method has the advantages that the casing is subjected to high-temperature instant heat treatment through the heat transfer unit, the moisture and the internal gas pressure of the casing are controlled, and the thermal decomposition risk of the casing is reduced, so that the artificial collagen casing with low thermal shrinkage is obtained; the casing subjected to high-temperature instant heat treatment is heat-resistant, and the heat shrinkage of the casing is reduced when the casing is applied, so that the shrinkage rate of the fermented flavor sausage is small after continuous high-temperature fermentation and air drying.