318 results about "Proportioning valve" patented technology

The invention relates to the technical field of liquid cooling heat dissipation, in particular to a liquid cooling distribution device, liquid cooling heat dissipation equipment and a liquid cooling control method. The liquid cooling distribution device comprises a main liquid supply collecting pipe, a flow adjusting assembly, a multi-channel liquid distribution assembly, a plurality of cooling medium conveying pipelines and a central control unit, a proportioning valve of the flow adjusting assembly is connected into the main liquid supply collecting pipe in parallel, and a liquid distributor of the multi-channel liquid distribution assembly is correspondingly connected with the proportioning valve. A parallel branch of the liquid separator is connected with the liquid outlet node through the reversing valve, and the two ends of the cooling medium conveying pipeline are connected with the liquid outlet node and target heat dissipation equipment respectively; the central control unit achieves accurate distribution and dynamic adjustment of the flow of the cooling liquid by controlling the proportion adjusting valve and the reversing valve, the problem of uneven flow distribution caused by pipeline resistance difference is solved, the flow can be adjusted according to real-time heat loads, and system energy consumption is optimized.

The invention relates to the technical field of unmanned aerial vehicle power systems, in particular to a low-altitude unmanned aerial vehicle hydrogen-electricity hybrid energy management system and control device.According to the low-altitude unmanned aerial vehicle hydrogen-electricity hybrid energy management system and control device, the residual hydrogen amount can be accurately quantified through combined collection and fusion calculation of hydrogen flow signals and air pressure signals; and the opening state of the proportional valve and the air inlet valve is adjusted in real time under data driving, so that the hydrogen input is matched with the actual power requirement, the voltage, the current and the temperature are synchronously monitored, and fluctuation feature extraction and life parameter calibration are performed on a power output sequence. The operation health degree and the life loss trend of the fuel cell can be dynamically obtained before power distribution, an accurate reference basis is provided for follow-up power allocation, the internal resistance change trend is measured and calculated through voltage and current sampling, and dynamic adjustment of the charge-discharge depth and charge-discharge process parameters is carried out in combination with the health degree. And the usability and the load capacity of the lithium battery are accurately represented.

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 invention belongs to the technical field of semiconductor wafer process treatment, and particularly relates to a wafer bonding safety floating force application device and a use method thereof. A power source is fixed to a frame, a lead screw is connected with the output end of the power source, the lead screw is in threaded connection with a nut, the nut is fixedly connected with a sliding table plate, and an air cylinder is installed on the bottom face of the sliding table plate; the pressing disc body is connected with a cylinder rod of the air cylinder, and the supporting disc body is fixed to the bottom of the frame and located below the pressing disc body. A pipeline connector of the air cylinder is connected with the electric proportional valve, the electric proportional valve outputs fixed gas pressure needed by bonding to the air cylinder, and the pressing disc body is in pressing fit with the supporting disc body when the air cylinder is in a floating force application state. By adopting a mode of combining a rapid positioning structure and a floating force application structure, floating press fit of the bonding disc in the vacuum cavity is realized, the press fit adaptivity is improved, the control difficulty is reduced, the press fit force control precision is improved, the production safety is enhanced, and the production yield of the bonding process is further improved.

The invention discloses a safety protection type power supply equipment load step-by-step detection device, which belongs to the technical field of power supply equipment detection and comprises a base plate, a movable frame is arranged at the top of the base plate, the bottom of the movable frame is fixedly mounted at the top of an electric track sliding table, and a three-stage hydraulic cylinder is fixedly mounted at the top of the movable frame. An oil inlet pipeline of the third-stage hydraulic cylinder is connected with an electromagnetic proportional valve in series, and the output end of the third-stage hydraulic cylinder is hinged to a connecting plate through a connecting block and a shaft pin. The movable frame is driven to a proper position through the electric track, then the output force is regulated and controlled by the three-stage hydraulic cylinder through the electromagnetic proportional valve, the connecting plate and the belleville spring set are pushed to enable the load pressing plate to move downwards to apply load to power supply equipment, all sensors conduct real-time monitoring in the process, and the lifting plate acts along with the load pressing plate to form protection. The load can be accurately applied step by step, the equipment state can be synchronously monitored, the good buffering and protection capacity is achieved, and the detection safety and accuracy are improved.

The invention relates to the technical field of wall-hanging stoves, and discloses an ignition control method and device of a wall-hanging stove, a controller and the wall-hanging stove.The ignition control method comprises the steps that when ignition of the wall-hanging stove fails, the valve opening current of a gas proportional valve of the wall-hanging stove is detected, and when the valve opening current is smaller than a preset current threshold value, the valve opening current is increased, and the wall-hanging stove is controlled to execute ignition operation again; when the valve opening current is larger than or equal to the preset current threshold value, the fan rotating speed of the wall-hanging stove is detected; and when the rotating speed of the fan is larger than the preset rotating speed threshold value, the rotating speed of the fan is adjusted to the preset rotating speed threshold value, and the wall-hanging stove is controlled to execute re-ignition operation. According to the method, the valve opening current is firstly adjusted when the execution of the ignition operation fails, so that the ignition success rate of the wall-hanging stove is increased by increasing the air inlet pressure, and the rotating speed of the fan is adjusted when the valve opening current is greater than the preset current threshold value, so that the ignition failure caused by flame separation and fire transfer failure is avoided by reducing the air inlet amount of cold air; the ignition success rate of the wall-hanging stove is improved.

A mine dump truck wet disc brake hydraulic system, including main control valve, one end of main control valve is connected pressure oil source, the other end is connected front brake system and middle and rear brake system, front brake system includes brake pedal, front axle proportional control valve group, front axle brake valve group and front brake cylinder, middle and rear brake system includes brake pedal, slow running valve, middle and rear axle brake valve, rear axle proportional valve group, relay valve group, rear axle brake cylinder and middle axle brake cylinder, the utility model discloses a mine dump truck wet disc brake hydraulic system can realize manual operation brake and line control remote brake function, reaches unmanned operation's requirement, is used for unmanned vehicle or auxiliary driving, and in order to adapt to the distance of middle and rear axle of three axle vehicle and the distance of main brake valve group is longer, two relay valve groups are added, brake corresponding speed is improved, faster brake response is realized, makes travel more safe.

The utility model belongs to the technical field of valves, and particularly discloses a valve element assembly and a gas proportional valve. The valve element assembly comprises a valve element seat, a sealing head, a magnet and an elastic sealing unit. Wherein the sealing head and the valve core seat are coaxially arranged on the outer side of the valve core seat in a sleeving manner; the magnet and the sealing head are coaxially installed on the valve element seat, and at least part of the magnet is located on the inner side of the sealing head. The elastic sealing unit is coaxially arranged on the outer side of the valve element seat in a sealing and sleeving mode, the sealing head and the magnet are located on the same side of the elastic sealing unit, and the elastic sealing unit can be pressed to deform so as to apply axial force to the valve element seat. The gas proportional valve comprises the valve element assembly. According to the valve element assembly and the fuel gas proportional valve, the deflection amplitude generated when the valve element assembly is used can be reduced, the pressure and flow stabilizing performance of the fuel gas proportional valve is improved, and gas vibration and noise in the using process of the fuel gas proportional valve are reduced.

The invention discloses a vehicle fuel cell oxygen supply system and method for a variable altitude environment, and the system comprises an air compressor, a three-way valve, a high-pressure oxygen cylinder, a gas storage tank, and a four-way proportional valve. An outlet of the high-pressure oxygen bottle is communicated with a third inlet of the four-way proportional valve; an outlet of the gas storage tank is communicated with a second inlet of the four-way proportional valve; three ports of the three-way valve are respectively communicated with an outlet of the air compressor, an inlet of the air storage tank and a first inlet of the four-way proportional valve; an outlet of the four-way proportional valve is used for being communicated with an air inlet of the fuel cell stack, so that a proper amount of oxygen enters the air inlet of the fuel cell stack. According to the invention, the fuel cell can stably work under different altitude conditions.

The utility model provides a rolling and flattening device for copper sheet manufacturing and machining, which belongs to the field of metal sheet machining and comprises a workbench, an adjusting component and a cleaning component. A mounting frame is fixedly mounted on the surface of the workbench, and a plurality of lower roll shafts are rotationally mounted at the bottom of the inner side of the mounting frame; the utility model discloses. A mounting groove is formed in the surface of a mounting frame, a lifting block is slidably mounted in the mounting groove, an adjusting screw is rotatably mounted at the top of the mounting frame, when a rocking wheel is rocked, the adjusting screw is driven to rotate so as to drive the lifting block to ascend and descend in the mounting groove, the lifting block ascends and descends to drive an upper roller shaft to move relative to a lower roller shaft, and therefore the distance between the roller shafts is adjusted; the copper sheets with different thicknesses and sizes are flattened and rolled, the air supply branch pipes are connected with the compression air collection bag through the air proportional valves in the mounting box, air flow is driven by the air blowing nozzles to be quickly blown to the surfaces of the copper sheets, so that particle impurities on the surfaces of the copper sheets are cleaned, and the copper sheets are prevented from being scratched by the particle impurities during rolling.

The application discloses a mechanical control type Venturi premixer and an energy-saving and environment-friendly hot water boiler thereof. The Venturi premixer comprises a premixer main body, an adjusting driving assembly, an adjusting blocking piece and an elastic piece. The premixer main body is provided with an air inlet, an air adjusting opening, a sliding cavity, a gas inlet and a gas adjusting opening. The mixing cavity is provided with a positioning limiting column. The adjusting driving assembly comprises a driving unit and a driving shaft. The adjusting blocking piece comprises a blocking piece body, a gas adjusting blocking ring and an air adjusting blocking ring arranged on the blocking piece body. The driving unit is used for driving the gas adjusting blocking ring and the air adjusting blocking ring to move simultaneously through the driving shaft, so as to adjust the opening degrees of the gas adjusting opening and the air adjusting opening respectively. The premixer adopts a control scheme of mechanical linkage and elastic piece assistance. Through the cooperative matching of the adjusting driving assembly, a fan and a gas proportional valve, the accurate dynamic proportioning of the gas and the air is realized.

The utility model relates to the field of stabilizer bar, especially transverse stabilizer bar's adjustable connecting structure of four -wheel electric vehicle. The utility model discloses stabilizer bar, axle bush and pull rod, stabilizer bar is trapezoidal, and the both ends are punched into the ear piece, axle bush is covered in the middle part of stabilizer bar, and pull rod is provided with two, and is hinged in the both ends of stabilizer bar respectively, and pull rod is installed on the frame, and axle bush is connected with hydraulic device still, and the top of hydraulic device is fixed with bolt and set up on the frame. Axle bush connects hydraulic device, and is electrically connected with automobile ECU and is equipped with electric control proportional valve, can automatically or manually adjust the lateral stabilizer bar roll stiffness according to the intention of driver or road condition. When driving fiercely or high -speed driving, ECU controls electric control proportional valve to adjust hydraulic device output pressure according to sensor group feedback, and the roll stiffness is increased, and the control stability and high -speed driving safety are enhanced.

A hydraulic drive system for adaptively controlling the speed of a cooling fan of a rail engineering vehicle is provided. The oil outlet of a hydraulic plunger variable pump is connected to one end of a pressure pipe connected to a hydraulic motor, and the other end of the pressure pipe is connected to the oil inlet of a temperature-controlled proportional valve group. One oil outlet of each temperature-controlled proportional valve group is connected to an oil return pipe via a hydraulic oil radiator, and the oil return pipe is connected to a hydraulic oil tank. Two branches of the oil return pipe are respectively connected to the other oil outlets of the two temperature-controlled proportional valve groups. A safety protection structure connected in parallel with the hydraulic motor is provided on the pressure pipe, and the hydraulic plunger variable pump is connected to a flow regulation structure. The present invention solves the drawbacks of large system pressure shocks and extremely high noise generated when traditional on-off valve groups control the cooling fan. The system power is dynamically matched in real time according to the heat dissipation requirements to ensure safe operation of the vehicle, reduce the impact of instantaneous starting and stopping of the cooling fan, reduce the noise generated, and increase the available traction power of the vehicle power system.

The application discloses a closed electro-hydraulic variable-pitch system for wind power generation, which comprises a variable-pitch cylinder, an opening and closing pitch unit arranged between a first oil port and a second oil port of the variable-pitch cylinder, a motor, a hydraulic pump, a proportional valve and a connecting pipe for conveying hydraulic oil, the motor is used for driving the hydraulic pump to work, an oil outlet of the hydraulic pump is communicated with a P port of the proportional valve, a T port of the proportional valve is communicated with an oil suction port of the hydraulic pump, and A and B ports of the proportional valve are respectively communicated with the first oil port and the second oil port of the variable-pitch cylinder; internal passages between the A and B ports and the P and T ports of the proportional valve can be cross-converted, and the flow directions of the oil inlet and outlet passages of the hydraulic oil between the first oil port and the second oil port are switched through the proportional valve. The variable-pitch system of the application has the advantages of traditional electric variable-pitch and hydraulic variable-pitch, greatly simplifies the hydraulic oil conveying pipeline, has fewer components, saves installation space, has high safety and has great cost advantage.

The utility model discloses an electromagnetic valve flow regulator, and belongs to the technical field of electromagnetic valve flow regulation, and the technical scheme is characterized in that the electromagnetic valve flow regulator comprises a workbench provided with a clamping seat; the inlet pipe is arranged on the clamping seat; the outlet pipe is arranged on the clamping seat; the electromagnetic proportional valve is mounted on the inlet pipe; the control system is used for adjusting the air pressure of the inlet pipe and the flow of the outlet pipe; wherein the clamping seat comprises a fixed seat, a movable seat and a first driving cylinder, the first driving cylinder is arranged between the fixed seat and the movable seat, the inlet pipe is arranged on the fixed seat, and the outlet pipe is arranged on the movable seat. According to the electromagnetic valve, the inlet pressure and the outlet flow can be adjusted to specified values, and the precision of the electromagnetic valve is improved.

The disclosure relates to a valve, e.g., a proportional valve, comprising a main piston for actuating a main volumetric flow and a pilot piston for actuating a pilot volumetric flow. The main piston and the pilot piston are guided in a valve housing in a longitudinally movable manner, and the pilot piston can be actuated using a magnetic device. The position of the main piston can be set using the pilot piston which, based on the movement position thereof, signals the fluid pressure acting on the main piston into a pilot chamber via a fluidic connection or cuts of the fluid connection and connects the pilot chamber to a tank or low-pressure side via another fluidic connection into which a valve is introduced that closes in a leak-proof manner as soon as a fluidic connection is produced between the main piston and the pilot chamber.

This invention discloses a flow distribution system and excavator suitable for excavators with multiple actuators. The system includes a pump unit, several flow distribution units, and a controller. A temperature and pressure sensor is installed at the outlet of the pump unit. Each flow distribution unit includes a first proportional valve and a second proportional valve, whose inlets are respectively connected to the pump unit. Port A of the first proportional valve and port B of the second proportional valve are respectively connected to the inlet and outlet ports of the corresponding actuators. Temperature and pressure sensors are installed at ports A and B of the first and second proportional valves, respectively. The controller calculates control signals for the pump unit, the first proportional valve, and the second proportional valve based on acquired engine speed, relevant parameters of the pump unit, handle signals, and output signals from the temperature and pressure sensors. The controller then controls the pump unit, the first proportional valve, and the second proportional valve according to these control signals. This invention enables precise flow distribution and coordinated control of the pump and valves.

This utility model relates to a hydraulic cylinder control system with adjustable displacement speed and intermediate stop capability. It includes a cylinder assembly with a valve group and a controller connected to it. The cylinder assembly includes a cylinder body, a piston rod, and a rear-end rod. A displacement sensor, connected to the rear-end rod via a bracket, is located on the cylinder body side corresponding to the rear-end rod. The displacement sensor and the rear-end rod are connected via a connecting rod. A valve needle is connected to the front end of the piston rod. The displacement sensor obtains the cylinder body's displacement data. The controller adjusts the flow rate of the proportional directional valve and the valve core position based on the cylinder body displacement data to drive the cylinder body to change its displacement speed and achieve intermediate stop of the cylinder movement at any desired position. This allows for differentiated control of the opening and closing of the injection port by valves at different points within the same hot runner system, resulting in smoother injection and venting, and effectively improving the quality of injection molded products.

The invention relates to an integrated two-stage empty and load adjusting device for a railway wagon and a control method thereof, and aims to meet the requirements that an existing stepless adjusting device is complex in pipeline and has multiple leakage points, and a heavy load special line only needs two-stage empty and load adjustment, a proportional valve assembly and a sensing valve assembly are integrated into a whole. Installation arrangement is simplified, and pipeline joints and potential leakage risks are reduced. A proportional valve assembly of the device adjusts the compressed air flow from a brake control valve to a brake cylinder, a sensing valve assembly controls connection and disconnection of the brake cylinder and a pressure reduction air cylinder according to the vehicle load state, and a pressure adjusting assembly controls exhaust of a proportional piston back cavity through the pressure of the pressure reduction air cylinder. The sensing valve assembly opens a brake cylinder and pressure reduction air cylinder passage when the vehicle is empty and closes when the vehicle is loaded, precise two-stage pressure adjustment of empty and loaded working conditions is achieved, and meanwhile structural light weight, arrangement convenience and system reliability are taken into consideration.

The application relates to a gas control vacuum proportional valve, belonging to the field of gas pump pressure regulation, and mainly applied to vacuum pumping after electrolyte is filled into a battery pack of a lithium battery. The gas control vacuum proportional valve comprises a valve head, a valve body and a valve core. The valve head and the valve body enclose a positive pressure cavity connected with a positive pressure gas source. The valve core is provided with an output air channel connected with a vacuum pump and an input air channel connected with a lithium battery device to be vacuumized. The input air channel and the output air channel are selectively connected into a vacuum flow channel through an air port. The valve core is further provided with a containing cavity and a gas control pressure regulating assembly arranged in the containing cavity. The gas control pressure regulating assembly comprises a rubber-coated valve port diaphragm separating the vacuum flow channel and the containing cavity. The valve core is provided with a gas stopping baffle. The gas pressure in the positive pressure cavity can drive the rubber-coated valve port diaphragm and cooperate with the gas stopping baffle to form the air port. The containing cavity is always in a sealed state, so that the problem that corrosive electrolyte is inhaled into the containing cavity along with the gas when the gas control vacuum proportional valve is used to pump vacuum after electrolyte is filled into the battery pack is solved.

The utility model discloses an electric vehicle thermal management system and a vehicle. The electric vehicle thermal management system comprises a refrigerant circulation loop and a cooling liquid circulation loop which share a water-cooling condenser and a cooler. The cooling liquid circulation loop further comprises a battery pack, a motor assembly, a radiator, a water heater, a cold air core body, a warm air core body, a first three-way proportional valve, a second three-way proportional valve and a nine-way valve. A first port of the nine-way valve is connected with the battery pack, a second port is connected with the cold air core and the cooler, a third port is connected with the warm air core and the water-cooling condenser, a fourth port is connected with the first three-way proportional valve, a fifth port is connected with the second three-way proportional valve, and a sixth port and a seventh port are connected with the two ends of the radiator respectively. The sixth port and the eighth port are connected with the two ends of the motor assembly respectively, and the ninth port is connected with the battery pack. The flow path of cooling liquid is switched through the nine-way valve, the first three-way proportional valve and the second three-way proportional valve, different function modes can be achieved, the number of system valves is small, the integration degree is high, and the system is suitable for combustible refrigerants.

The application discloses an electro-hydraulic brake system for controlling vehicle wheel group braking, comprising a parking brake system and a service brake system, and specifically comprising an oil tank, a motor pump group, a two-position two-way electromagnetic reversing valve, a pump outlet pressure gauge, an accumulator liquid charging valve, a two-position three-way electromagnetic reversing valve, a parking brake accumulator, a parking brake pressure gauge, a pressure reducing valve, a service brake accumulator, a pressure sensor, a service brake proportional valve, a motor parking brake, a speed reducer service brake, a vehicle wheel group, a wheel group driving motor, a hydraulic pipeline and an electrical control module. The parking brake system and the service brake system of the electro-hydraulic brake can independently or cooperatively operate, can control the brakes of four wheel groups of the vehicle in real time, can ensure the absolute stop of each wheel group of the vehicle, can maintain the parking of the vehicle under any working conditions such as slopes, can avoid the vehicle from tilting, vibrating and slipping when running due to road conditions, can meet the demand of efficient braking of heavy vehicles, and can improve the safety of the vehicle.

This invention relates to a portable diesel engine proportional valve internal leakage detection system and method, comprising: a pilot valve test plate with a first hole, a second hole, a third hole, and a first fixing hole, wherein the first fixing hole matches the fixing hole of the pilot valve; a main valve test plate with a fourth hole, multiple fifth holes, and a second fixing hole, wherein the second fixing hole matches the fixing hole of the main valve; and a distribution block with a main flow channel inside, an outlet pipe at the outlet end of the main flow channel, a flow detection element at the outlet pipe, and the main flow channel also connecting to a first branch flow channel and a second branch flow channel. Both the inlet ends of the first and second branch flow channels are equipped with switching valves. The switching valve of the first branch flow channel can be connected to the first hole through a pipe, and the switching valve of the second branch flow channel can be connected to the fourth hole through a pipe. The system of this invention reduces detection costs.

This invention discloses a shock absorber assembly and its control method, system, and vehicle, belonging to the field of shock absorber technology. The shock absorber assembly includes a shock absorber; a base; a torque motor, which includes a magnetic element, a coil, and a housing. The housing is equipped with a permanent magnet. The magnetic element is connected to a drive rod extending out of the housing. When the coil is energized, opposite magnetic poles are formed at both ends of the magnetic element. The magnetic element interacts with the permanent magnet to cause the magnetic element to oscillate; a slide rod, one end of which is connected to a slide valve, and the other end is connected to the drive rod via a hinge structure; and a stress-resistant elastic element, mounted on the drive rod, which resists the oscillation of the drive rod. Because the current is continuously controlled and varied, the damping force of the shock absorber can be continuously adjusted, achieving precise damping force control. The adjustment of the damping force of the shock absorber has high accuracy and stability, and avoids the jamming problem commonly found in proportional valves.

A proportional valve arrangement for refrigerant includes a valve body chamber having an inflow opening, a first outflow opening and a second outflow opening. Furthermore, the proportional valve arrangement includes a valve body which is designed to be transferable in the valve body chamber in a longitudinal axis direction between a first sealing seat and a second sealing seat, wherein the valve body opens a first flow path from the inflow opening to the first outflow opening when the valve body bears against the first sealing seat, and opens a second flow path from the inflow opening to the second outflow opening when the valve body bears against the second sealing seat.

A fluid suspension system for a land vehicle is provided with a fluid biasing member with a first fluid port and a second fluid port. The fluid biasing member is adapted to be connected to a chassis and a first axle of a land vehicle spaced apart from a pivotal connection of the first axle to pivot the first axle relative to the chassis upon movement to a first position and a second position. A proportional valve is in fluid cooperation with the first fluid port of the fluid biasing member to permit fluid to flow to the fluid biasing member to bias the fluid biasing member to the first position, and to permit the fluid to flow from the fluid biasing member to the proportional valve, and to the second fluid port of the fluid biasing member to bias the fluid biasing member to the second position.

The application discloses a kind of air-blowing auxiliary solid-state soil conditioner strong discharge uniform application device, which belongs to agricultural machinery.The automatic controller and air pressure transmission system are installed on the frame, and the four material application discharge valves of front and rear rows are concentrically connected in series and connected by a communication pipe.The driven sprocket and driving sprocket are respectively arranged on the left and right sides of the two ends of the double-row material application discharge valves, the speed motor is connected with the driving sprocket, and the two feed hoppers are respectively fixed between the driving sprocket and the right end material application discharge valve of the front row, and the driven sprocket and the left end material application discharge valve of the rear row.The automatic controller is composed of a key module, a microcontroller, motor drive modules, a speed sensor, a communication interface, a voltage linear amplifier, a D / A converter and a display screen.The air pressure transmission system includes an air pressure sensor, an air compressor, an air tank, a filter and an electrical proportional valve.The application realizes continuous forced conveying and uniform discharge of solid-state soil conditioner, and has the characteristics of good uniformity and less blockage.

The application relates to a multi-mode brake system of a special vehicle, which comprises an emergency relay valve, a first relay valve, a second relay valve, an ABS controller, a foot brake valve, a hand brake valve, a normally open electromagnetic valve, a normally closed electromagnetic valve, an electric control proportional valve, a first shuttle valve, a second shuttle valve, a third shuttle valve, an air compressor and a plurality of brake chambers. The application can realize various modes of braking, two-by-two interlocking, automatic switching according to the walking mode of the vehicle, satisfy the overall brake system, can not only guarantee traction braking, but also does not affect the braking work when the vehicle independently walks; and is reasonably designed, can satisfy the integrated brake system of a vehicle under various walking mode states, is complete in function and improves work efficiency.

A gas collection device used by a multifunctional automobile exhaust detection analyzer comprises a power supply module, a filtering device, a cooling device, a peristaltic pump, a pressure sensor, an electric proportional valve and a sampling pump, the filtering device comprises a filter cartridge, a filter screen and a filter cartridge cover, and the cooling device comprises a shell and a semiconductor refrigeration mechanism. An exhaust pipe B of the cooling equipment is connected with the gas inlet end of the automobile exhaust detection analyzer body, the exhaust end of the automobile exhaust detection analyzer body is connected with an inlet of the electric proportional valve, an outlet of the electric proportional valve is connected with an inlet of the sampling pump, and a gas inlet pipe of the pressure sensor P is installed on the exhaust pipe B. The probability that particulate matter blocks a subsequent pipeline and the interior of the automobile tail gas detection analyzer body is reduced, moisture in tail gas can be cooled, the temperature of the tail gas can be reduced, the flow and pressure of the tail gas entering the interior of the automobile tail gas detection analyzer body are stable, and the accuracy of tail gas data detected by the tail gas detection analyzer is guaranteed as much as possible. The device has a good application prospect.