472 results about "Proportioning valve" patented technology

A multi-way valve includes a valve seat and a valve core. The valve core is rotatably disposed in the valve seat, the valve seat is provided with a plurality of valve port groups, each valve port group includes a plurality of valve ports, the valve core is provided with communication structure groups corresponding to the valve port groups, respectively, and each of the communication structure groups further includes a plurality of communication structures arranged along a circumferential direction of the valve core. When the valve core is rotated to different rotation positions, valve ports in different valve port groups form different communication states. Only one valve core is required to make a two-way proportional valves, three-way proportional valve, and a four-way proportional valve achieve different communication states, with simple control, compact structure and low cost.

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

The invention 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 an electromagnetic clutch type hydraulic retarder, and particularly relates to the technical field of hydraulic retarders, the electromagnetic clutch type hydraulic retarder comprises a retarder body and a control module, the control module is connected with an electromagnetic clutch, an electromagnetic air proportional valve, a water temperature sensor, an oil temperature sensor and a pressure sensor through wire harnesses, the water temperature sensor is installed on a cooling water outlet pipeline of the heat exchanger, the pressure sensor and the electromagnetic air proportional valve are installed above the oil supplementing tank, the electromagnetic clutch is located between the driving gear and the transmission shaft, the driving gear and the transmission shaft are coaxially connected with the electromagnetic clutch, the transmission shaft is fixedly connected with the rotor, and the stator is fixed to the shell. Combination or separation of the driving gear and the rotor is achieved through the electromagnetic clutch, a floating ball valve, a forced lubrication structure and a stator and rotor disengagement structure are omitted, and the electromagnetic clutch has the advantages of being low in no-load power loss, fast in response, free of the oil injection phenomenon, simple in structure, low in failure rate, low in cost and weight and the like.

The dumper lifting system with the automatic discharging mode comprises a hydraulic oil tank, a lifting pump, a lifting proportional valve and a lifting oil cylinder and further comprises a controller, the input end of the controller is connected with a lifting angle sensor, a mode selection module, a lifting control module and a safety belt module, the lifting angle sensor is connected with the lifting oil cylinder, and the mode selection module is connected with the lifting control module. The mode selection module is a manual mode selection module and an automatic mode selection module, the output end of the controller is connected with a lifting proportional valve, a brake control module and a warning indicator, and the brake control module is connected with a vehicle brake. Through cooperative use of the mode selection module and the lifting control module, the manual operation mode and the automatic operation mode are completed, the automatic discharging mode of lifting discharging-top-reaching keeping-container falling is achieved, in the automatic discharging process, the safety of the system is monitored in real time, the mode can be switched to the manual mode at any time according to the actual situation, and the safety of the system is guaranteed. And the use safety of the system is ensured.

The utility model discloses a hydraulic system with a movable arm floating regeneration function and an excavator, and belongs to the technical field of engineering machinery. The defects that in a traditional excavator movable arm control system in the prior art, when an operator continuously controls a movable arm, fatigue is prone to being generated, and the working effect is affected are overcome. The main structure of the hydraulic system comprises a main pump, a pilot pump, a movable arm descending proportional valve, a movable arm lifting proportional valve and a movable arm oil cylinder, an oil outlet of the main pump is connected with the movable arm oil cylinder through a movable arm reversing valve, and an oil outlet of the pilot pump is connected with oil inlets of the movable arm descending proportional valve and the movable arm lifting proportional valve. An oil outlet of the movable arm descending proportional valve is connected with a right pilot oil port of the movable arm reversing valve, an oil outlet of the movable arm lifting proportional valve is connected with a left pilot oil port of the movable arm reversing valve, and a regeneration control assembly is further arranged between a rod cavity and a rodless cavity of the movable arm oil cylinder. The utility model is mainly applied to engineering machinery such as excavators and the like.

The invention discloses a general aero-engine high-altitude environment simulation device, and relates to the technical field of aviation tested engine tests, the general aero-engine high-altitude environment simulation device comprises a fresh air system, a refrigerating unit and a tested engine, the output end of the fresh air system is provided with a connecting pipeline, and one side of the connecting pipeline is provided with the refrigerating unit communicated with the interior of the connecting pipeline; an air inlet and outlet proportional valve is arranged on the inner side wall, close to the refrigerating unit, of the connecting pipeline, a pipeline heating device is arranged on the outer wall, close to the air inlet and outlet proportional valve, of the connecting pipeline, and a first pressure stabilizing tank is arranged on the side, away from the pipeline heating device, of the connecting pipeline. According to the device, through cooperative control of the intake and exhaust proportional valve and the vacuum pump unit, precise simulation that the pressure fluctuation range is smaller than or equal to + / -1% and the temperature deviation is smaller than or equal to + / -1 DEG C at the height of 0-12000 meters is achieved, and the airworthiness certification standard is met.

The utility model belongs to the technical field of valves, and discloses a bidirectional inverse proportion flow valve. The bidirectional inverse proportional flow valve comprises a valve sleeve, a proportional valve element, an electromagnetic driving assembly and a compensation valve element. A valve port A and a valve port B are formed in the valve sleeve. One end of the proportional valve element is arranged in the valve sleeve and provided with a valve element hole, and fluid can flow to the valve port B through the valve port A and the valve element hole in sequence or flow to the valve port A through the valve port B and the valve element hole in sequence. The electromagnetic driving assembly is assembled on the valve sleeve and used for pushing the proportional valve element to axially move in the valve sleeve. The compensation valve element is arranged in the valve sleeve and can move in two directions in the axial direction of the valve sleeve under the action of the pressure difference between the valve port A and the valve port B. The bidirectional inverse proportion flow valve provided by the utility model can realize bidirectional inverse proportion adjustment and pressure compensation, so that the bidirectional inverse proportion flow valve can be applied to occasions requiring bidirectional proportion adjustment and pressure compensation, and is wide in application scene and high in universality.

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 high-pressure pump sealing, and particularly relates to a static sealing structure between a plunger sleeve and a valve seat. The sealing device is located between an oil outlet valve seat and a plunger sleeve and comprises an annular sealing ring inside the upper end face of the plunger sleeve and an annular supporting ring outside the upper end face of the plunger sleeve. The lower end face of the oil outlet valve seat is a plane, the side face of the annular sealing ring is a convex arc face, and the oil outlet valve seat and the annular sealing ring form a non-conformal single-arc-face sealing structure or a conformal contact double-arc-face sealing structure. The sealing device is suitable for high-pressure large-flow hydraulic elements and hydraulic systems, high-frequency-response electro-hydraulic servo valves and proportional valves, high-performance hydraulic system sealing devices and the like, and is used for meeting the sealing requirements of dynamic pressure and alternating load working conditions in the high-pressure hydraulic systems, effectively solving the problem of interface separation and effectively prolonging the fatigue life at the same time.

The invention discloses an engine test bed intercooler temperature control system comprising an intercooler used for simulating work under actual working conditions; the constant-temperature heater is used for heating the cooling liquid to a preset temperature; the electronic water pump is used for driving cooling liquid to circulate and controllable in flow; the plate heat exchanger is used for heat exchange between the external circulation chilled water and the internal circulation cooling liquid; the expansion kettle is connected into the circulating system through a three-way valve to realize water replenishing and pressure balance; the bypass valve is arranged on the water pump bypass pipeline and used for adjusting the internal circulation flow and pressure, and the PID proportional valve is arranged on the external circulation chilled water pipeline and used for dynamically adjusting the external circulation chilled water flow; and the flow meter and the temperature and pressure sensor are used for monitoring the flow and pressure of the cooling liquid and the temperature of the outlet gas of the intercooler in real time.

The utility model relates to the technical field of agricultural implements, in particular to an automatic speed regulation type traction type hydraulic self-power driving rake which comprises a frame used for being connected with a tractor, a rake body connected to the periphery of the frame, a main power device installed on the frame, a hydraulic transfer case connected to the main power device and an oil pump installed on the hydraulic transfer case. An oil pipe is connected to the oil pump, a proportional valve used for adjusting the flow of liquid in the oil pipe is installed on the oil pipe, and a branch power device used for being connected with the oil pipe is installed on the rake body. Power is transmitted through hydraulic pressure, flexible driving is carried out, a machine tool can be well protected if hard sundries exist, an oil pipe can be made of a soft pipe so that assembly layout can be more convenient and reasonable, the size of the driving harrow can be conveniently increased according to requirements, and the rotating speed of harrow teeth can be adjusted more flexibly through hydraulic transmission; the increase and decrease of the liquid flow can be steplessly adjusted through the proportional valve, so that the adjustable range of the rotating speed is expanded to adapt to different soil environment requirements.

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 discloses a head pasting device and method capable of adjusting pressure through pneumatic control, and belongs to the technical field of head pasting, an upper rotating shaft and a lower rotating shaft are mounted on a rotating shaft mounting seat through rotating bearings, a power device used for driving the upper rotating shaft to rotate is arranged on the rotating shaft mounting seat, and the lower rotating shaft is connected with the upper rotating shaft through a bolt; a closed cavity is formed in the connecting position of the upper rotating shaft and the lower rotating shaft, an air bag diaphragm and a piston are arranged in the closed cavity, a hollow guide shaft is coaxially arranged on the piston, the hollow guide shaft is installed in the lower rotating shaft through a guide shaft sleeve and connected with the suction nozzle assembly, and the pneumatic control pressure assembly is communicated with the closed cavity and the hollow guide shaft. According to the scheme, an air control pressure assembly is adopted, air pressure input is dynamically adjusted through an electric proportional valve, flexible transmission of an air bag diaphragm and a piston is combined, air pressure is accurately converted into linear displacement, and suction nozzle contact pressure is driven to follow a set value in real time.

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.

The invention relates to the technical field of electric vehicle thermal management, and discloses an electric vehicle thermal management system and a control method thereof. The system comprises a compressor, multiple sets of refrigerant loops and cooling liquid loops, a three-way proportional valve, an electronic expansion valve and a controller, the refrigerant loops achieve heat transfer through the compressor and a water-cooled condenser, and the cooling liquid loops distribute heat to a passenger compartment and a battery through an electronic water pump and the three-way proportional valve; according to the control method, a first, second or third initialization mode is selected based on the outside environment temperature, and multi-loop cooperative control is achieved by adjusting the opening degree of the valve, the duty ratio of the water pump and the rotating speed of the compressor. The R290 refrigerant is adopted to broaden the operating temperature range, electric drive waste heat recovery and passenger compartment waste heat utilization are combined, the low-temperature heating energy efficiency ratio is remarkably increased, the problems that an existing heat pump system is difficult to start at the extremely low temperature, heating is delayed, and energy consumption is too high are solved, and rapid temperature rising and accurate temperature control of the passenger compartment and a battery in the environment of-30 DEG C or above are achieved.

The control system comprises a control unit, an oil tank, an oil pump, a heat exchanger, a two-position three-way slide valve, a two-position three-way proportional pressure control slide valve, a switch electromagnetic valve, a proportional electromagnetic valve, a proportional valve and an air source, the air source is respectively connected with the switch electromagnetic valve and the proportional electromagnetic valve, an air outlet of the switch electromagnetic valve is respectively connected with the two-position three-way slide valve and the two-position three-way proportional pressure control slide valve, and an air outlet of the proportional electromagnetic valve is connected with the proportional valve. During working, under the control of the two-position three-way slide valve and the two-position three-way proportional pressure control slide valve, engine oil can quickly enter the brake cavity to quickly generate brake torque, and the proportional electromagnetic valve can control the opening degree of the proportional valve to adjust the flow of the brake engine oil in the brake cavity so as to adjust the brake force. Therefore, the speed changing box has the advantages that the effect taking time of the brake oil cavity is prolonged, engine oil emulsification is prevented, the liquid filling rate is accurately controlled, oil pumping and oil leakage of the speed changing box are prevented, and air loss is reduced.

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 invention discloses a film roll cantilever type cutting mechanism which comprises a support, a sliding block is arranged on the support in a sliding mode, the upper end and the lower end of the sliding block are connected with an upper air cylinder and a lower air cylinder respectively, the upper air cylinder is connected with a proportional valve and a switch valve, and the upper air cylinder adjusts downward pressure of the sliding block through the proportional valve. An upper knife roll is rotationally arranged on the sliding block and connected with a driving mechanism, a lower back roll is arranged below the upper knife roll, and the lower back roll is rotationally arranged on the support. Compared with the prior art, when film penetrating is needed, after the electromagnetic valve is switched off, the upper air cylinder retreats, the lower air cylinder drives the upper knife roll to ascend along the first sliding rail, and a space is reserved for workers to complete the film penetrating action. And after the film penetrating action is completed, the electromagnetic valve is started, parameters of the electric proportional valve are set according to the actual position of the upper knife roll, and the gap between the upper knife roll and the lower back roll is adjusted to meet the requirement for product cutting size precision.

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 utility model discloses an internal and external hexagonal bidirectional automatic adjusting mechanism for a gas proportional valve, which comprises a first adjusting piece, a second adjusting piece, a first connecting piece, a second connecting piece and a third adjusting piece, and the first adjusting piece is matched with the end part of a shaft core of the gas proportional valve; the second adjusting part is located on the outer side of the first adjusting part, and the inner circumference of the second adjusting part is matched with a nut on a shaft core of the gas proportional valve; and the driving mechanism is in transmission connection with the first adjusting piece and / or the second adjusting piece, and the driving mechanism and the first adjusting piece and / or the second adjusting piece rotate through at least one of the shaft core and the nut so that the shaft core and the nut can be locked in a threaded mode. The first adjusting piece or the second adjusting piece or the first adjusting piece and the second adjusting piece rotate in opposite directions together through the driving mechanism, so that the shaft core and the nut are locked, time and labor are saved, and production efficiency is high.

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.

A gear engaging hydraulic control valve block relates to the technical field of valve blocks and comprises a valve block body which is provided with an oil inlet and an oil return port. The oil inlet is connected with a pressure stabilizing valve and an energy accumulator, the oil inlet is connected with two first proportional valves in parallel, oil outlets of the two first proportional valves are connected with a gear shifting bidirectional telescopic cylinder and are connected with oil inlets in the two ends of the gear shifting bidirectional telescopic cylinder, the oil inlet is further connected with a second proportional valve, and an oil outlet of the second proportional valve is connected with a hydraulic clutch. The utility model solves the problem that the gear engagement cannot be accurately controlled due to the fact that the gear engagement force is not accurately grasped and the gear engagement is easy to be over-position or the gear cannot be engaged in the gear engagement process when the tractor is in the gear engagement process by manual gear engagement in the prior art.