138 results about "Valve oil" patented technology

The invention discloses a closed center multi-way valve with a converging function, a hydraulic system and a loading machine. An oil inlet P1 of the multi-way valve is sequentially connected with inlets of a bucket unit, a movable arm unit and a machine tool unit; the oil inlet P3 is connected with the control end of the first hydraulic control valve, an inlet of the first hydraulic control valve and an inlet of the first one-way valve. The outlet of the one-way valve I is connected with the outlet of the one-way valve III and the inlet of the machine; an inlet of the second hydraulic control valve is connected with a spring cavity of the first hydraulic control valve, the control end of the machine and tool joint compensator and the control end of the second hydraulic control valve, an outlet of the second hydraulic control valve is connected with an inlet of the second one-way valve, and an outlet of the second one-way valve is connected with the control end of the movable arm joint compensator and the control end of the bucket joint compensator. According to the hydraulic system combining the quantitative gear pump and the closed center multi-way valve, two options of standard flow and large flow can be achieved, under the condition that no action is carried out, confluent flow can normally return to an oil tank, and it can be guaranteed that the movable arm unit and the bucket unit work at the standard flow in the large-flow state.

The application discloses a buoyancy adjusting and communication device for underwater AUV, which comprises a communication cabin body, an integrated antenna, an inner oil tank, an air bag, an air bag pressing ring, an air bag cabin body, a rear end cover, a pump valve gas path assembly, a pump valve oil path assembly, an outer oil tank assembly and the like. The communication cabin body is connected with an AUV pressure cabin body and is sealed through an O-shaped ring. The integrated antenna is installed on the communication cabin body and is sealed through an O-shaped ring, and is used for the communication function of the underwater AUV. The inner oil tank is fixed on the air bag cabin body, and the air bag is sleeved on the air bag cabin body and is tightly sealed through the air bag pressing ring. The pump valve gas path assembly is used for discharging the gas in the cabin to the air bag or sucking the gas in the air bag into the cabin, so as to change the buoyancy state of the AUV. The pump valve oil path assembly is used for discharging the hydraulic oil in the inner oil tank to the outer oil tank assembly or sucking the hydraulic oil in the outer oil tank assembly into the inner oil tank, so as to change the buoyancy state of the AUV.

The invention is suitable for the technical field of shock absorbers, and provides a transverse shock absorber compression valve assembly which comprises a compression valve assembly body transversely installed between a working cylinder and an oil storage cylinder base, and the compression valve assembly body and the oil storage cylinder are positioned in the circumferential direction through a centering gasket. The compression valve assembly comprises a compression valve screw, a compression valve seat and a compression valve nut which are transversely arranged, a compensation valve oil way is arranged on the lower portion of the compression valve seat, and oil in the oil storage cylinder enters the working cylinder through the compensation valve oil way to achieve oil exchange. Meanwhile, due to the fact that air can be gathered on the upper portion of the oil storage cylinder due to the fact that the density of the air is smaller than that of oil, and the compensation valve oil way is located below the compression valve assembly, the air in the oil storage cylinder is prevented from entering the working cylinder through the compensation valve oil way, functional defects of the transverse shock absorber are effectively avoided, and the working performance of the transverse shock absorber is improved.

The invention relates to the technical field of valve oil seal testing, in particular to sealing performance testing equipment for automobile sealing ring parts. Comprising a support frame; the control panel is installed on the side face of the supporting frame. The mounting plate is connected to the top of the supporting frame; the fixing frame is connected to the top of the mounting plate; the mold is placed on the fixed frame; and the rotating frame is rotationally connected to the top of the mounting plate. The sealing performance between the rotating frame and the fixed frame is ensured through cooperation of the rotating frame and the fixed frame and the first sealing ring, a closed space can be formed to simulate actual working conditions, engine oil in the closed space cannot leak due to external factors when the sealing performance of the valve oil seal is tested, therefore, misjudgment can be avoided, and meanwhile, the sealing performance of the valve oil seal is ensured. When the valve oil seal leaks, certain hydraulic pressure is kept in the fixed frame and the rotating frame, any leakage can cause engine oil to be sprayed out from a gap between the valve body and the valve oil seal, and the visual representation enables the test result to be more accurate and reliable.

The utility model discloses an oil gas inlet cleaning device for a combination valve, which relates to the technical field of valve cleaning and comprises a base, a machining table is fixedly erected on the top of the base, two fixing seats are fixedly connected to the top of the machining table, and two clamping cylinders are fixedly mounted in the fixing seats in a penetrating manner. Clamping blocks are fixedly connected to the telescopic ends of the two sets of clamping air cylinders correspondingly, a valve body is clamped and fixed between the two sets of clamping blocks, and an oil gas inlet of the valve body faces upwards. And the cleaning mechanism comprises a mounting base, a lifting air cylinder, a lifting base, a mounting frame, a motor, a cleaning brush and a liquid storage box, and the mounting base is in an L shape. The oil-gas inlet of the combination valve can be rapidly and conveniently cleaned and cleaned, time and labor are saved, efficiency is high, cleaning uniformity is good, meanwhile, waste liquid generated by cleaning and cleaning can be collected and filtered, waste liquid and impurity particles can be separated and treated in a centralized mode, and practicability is high.

The invention provides an oil insulation three-phase integrated converter transformer system. The system comprises a converter valve provided with a diode valve, a direct current side outgoing line and a converter transformer valve side outgoing line, and a three-phase three-winding converter transformer provided with three-phase winding structures, and each phase winding structure comprises a network side outgoing line, a valve Y side outgoing line and a valve D side outgoing line; the top of the converter valve oil tank is provided with a direct-current sleeve, and the side wall of the converter valve oil tank is communicated with a converter valve side sleeve; the top of the transformer oil tank is provided with a network side sleeve, and the side wall of the transformer oil tank is communicated with a valve Y side sleeve and a valve D side sleeve; a plurality of converter transformer valve side sleeves are respectively butted and communicated with a plurality of valve Y side sleeves and a plurality of valve D side sleeves; an alternating current side outgoing line is connected with a valve Y side outgoing line and a valve D side outgoing line; and an AC-DC conversion system is formed among the converter valve oil tank, the transformer oil tank, the converter transformer valve side sleeve, the valve Y side sleeve and the valve D side sleeve. Through the current conversion system provided by the invention, the problems of low integration level, large equipment quantity, large size, large occupied area, high cost, complex structure, complex electrical connection and the like of the current conversion system are solved.

The invention discloses a filling pump swing valve main control oil way system and a control method, the filling pump swing valve main control oil way system comprises a swing valve oil cylinder A and a swing valve oil cylinder B which are oppositely arranged, and the filling pump swing valve main control oil way system further comprises an electro-hydraulic directional control valve composed of a first electro-hydraulic directional control valve and a second electro-hydraulic directional control valve; the filling pump swing valve main control oil way system further comprises a bypass valve and a pressure reducing valve. When the filling operation is normally stopped, one swing valve oil pump completely extends out and the other swing valve oil pump completely compresses under the action of the electro-hydraulic reversing valve, the bypass valve is manually operated, the swing valve oil cylinder can be located at any position, and impact generated to a support ball socket during reversing of the swing valve oil cylinder is eliminated. And the filling pipeline is connected with the filling pump hopper, so that self-flowing filling is realized.

The utility model relates to the technical field of bale collecting equipment, in particular to a hydraulic system of a small square bale bundling and collecting machine. The main hydraulic system comprises a plunger variable pump, a high-pressure filter and an electric proportional multi-way valve; the plunger variable pump adopts a plunger variable pump with pressure cut-off and load sensitive functions, and the electric proportional multi-way valve is a load sensitive electric proportional multi-way valve; the plunger variable pump is powered by a power shaft of a tractor; an oil inlet of the electric proportional multi-way valve is connected with a pressure oil port of the plunger variable pump through the high-pressure filter, and the high-pressure filter filters rolling oil. A control oil return port of the electric proportional multi-way valve is connected with the oil tank, and a load pressure feedback signal output port is connected with a feedback oil port of the plunger variable pump; the electric proportional multi-way valve comprises a multi-union reversing valve which is connected with an actuator to form hydraulic loops with different functions. The hydraulic system has the advantages of being high in output efficiency, saving fuel oil, reducing oil consumption, reducing heating of the hydraulic system, prolonging the service life of hydraulic elements and reducing pollution.

The utility model discloses a device for taking out a guide sleeve assembly of a steam turbine high-pressure combined valve hydraulic servo-motor, which relates to the technical field of tools for taking out guide sleeve assemblies of hydraulic servo-motors and comprises an outer ring, a plurality of tin bronze lining tiles used for taking out copper sleeves are arranged on the circumferential side of the inner ring of the outer ring, and threaded holes are formed in the periphery of the outer ring. A lead screw is connected into each threaded hole in a screwed mode, and a connecting assembly matched with the lead screws is arranged in the middle of the outer side face of the tin bronze lining tile. According to the taking-out device, the outer ring is matched with the lining tile and the lead screw, the aim of rapidly taking down the guide sleeve assembly of the valve hydraulic servo-motor is conveniently achieved, the lining tile is matched with the connecting assembly and the lead screw, the guide sleeve assemblies with different diameters can be rapidly taken down, and the taking-out device is simple in structure, convenient to operate and high in practicability. The guide sleeve assembly can be safely and rapidly disassembled, the labor intensity of workers is greatly relieved, and the working efficiency of disassembling operation is effectively improved.

The pressing head comprises a shaft seat and the pressing head, a connector of the pressing head is detachably connected with the shaft seat, the pressing head comprises a column body, the protruding connector is arranged on the front end face of the column body, a second cavity and a first cavity are sequentially formed in the rear end face of the column body from outside to inside, and the first cavity is communicated with the second cavity. The second cavity and the first cavity are coaxially arranged, the diameter of the second cavity is larger than that of the first cavity, an insertion head is arranged at the bottom of the first cavity and extends backwards, and the head of the insertion head penetrates out of the second cavity. The utility model has the beneficial effects that the pressure head, the valve oil seal and the shaft seat are assembled, then the insertion head is inserted into the valve guide pipe, and the shaft seat is pressed forcibly, so that the valve oil seal is sleeved on the valve guide pipe, the whole process is simple to operate, the workload is reduced, the valve oil seal can be used on other types of machines by replacing a front end pressure head, and the cost is saved.

The utility model belongs to carbonization furnace technical field, specifically disclose a kind of carbonization furnace feeding mechanism of material supplement, including feed bin, feed bin top is equipped with feed inlet, feed bin bottom is equipped with discharge gate, discharge gate is detachably connected with gate valve on, gate valve is detachably connected with supplement bin on, supplement bin is equipped with rotating mechanism inside, rotating mechanism includes bearing, the outer ring of bearing is fixedly connected with the outer wall of supplement bin one side, the inner ring of bearing is fixedly connected with worm, motor is equipped on worm one end, worm is meshed and is connected with worm wheel, worm wheel is fixedly connected with shaft, shaft is equipped with blade, supplement bin bottom is detachably connected with feeding valve. To the problem of carbonization furnace drum valve oil leakage causes equipment failure under prior art, the utility model changes drum valve into plug valve by the mode that supplement bin is set on plug valve, and further solves the problem that carbonization furnace drum valve oil leakage causes equipment failure and influences production, and there is certain security risk under high temperature environment.

The utility model relates to the technical field of cotton press machines, in particular to a pre-pressing mechanism of a cotton press machine, which comprises a pre-pressing oil cylinder, a base and a controller, a rodless cavity is arranged at the inner top end of the pre-pressing oil cylinder, a rod cavity is arranged at the inner bottom end of the pre-pressing oil cylinder, a rodless cavity oil pipe is arranged at one end of the pre-pressing oil cylinder, and a rod cavity is arranged at the other end of the pre-pressing oil cylinder. A rod cavity oil pipe is installed at the other end of the pre-pressing oil cylinder, the pre-pressing oil cylinder is further communicated and connected with the motor pump set, a liquid filling assembly is installed between one end of the rodless cavity oil pipe and the top end of the pre-pressing oil cylinder and comprises a liquid filling oil tank, a liquid filling valve and a liquid filling valve oil pipe, and a liquid filling oil pipe is installed and connected between the liquid filling valve and the liquid filling oil tank. A liquid filling valve control oil pipe is installed and connected between the liquid filling oil pipe and the rod cavity oil pipe, the liquid filling oil tank and the liquid filling valve are both electrically connected with the controller, and a liquid filling oil return pipe is further arranged at the top end of the liquid filling oil tank. And the service life of the equipment is influenced.

The utility model relates to the technical field of testing devices, and provides a performance testing device for an integrated valve oil cylinder, which comprises a testing workbench and a power mounting table, a workbench surface is formed on the surface of the testing workbench, and an oil collecting assembly and a testing tool are arranged on the workbench surface; the operating table is arranged on one side of the working table top, a touch screen, operating buttons, an instrument panel and a quick plug module are arranged on the operating table, the touch screen is used for man-machine interaction, the operating buttons are used for controlling corresponding test systems, the instrument panel is used for displaying corresponding test data, and the quick plug module is used for being connected with oil ports of a tested object; the power mounting table is selectively connected with the test workbench and comprises an oil tank and an oil pump, the oil pump is arranged on one side of the oil tank, and the oil tank is used for supplying oil to a tested object; the oil tank is further connected with the oil collecting assembly. According to the utility model, various working conditions of the tested object in different working scenes can be simulated, and performance testing can be carried out on various complex conditions encountered by the tested object in practical application.

The utility model relates to a gearbox cleaning, filtering and maintaining device which comprises a box body, a cleaning and filtering device is arranged outside the box body, the cleaning and filtering device comprises a motor and a speed reducer, the motor is arranged at the bottom of the box body, and the speed reducer is arranged at the output end of the motor. According to the gear box cleaning, filtering and maintaining device, a gear box body is placed on the containing plate and fixed through a threaded rod and a rubber plate, then cleaning liquid is poured into the gear box body to submerge the gear box body, a motor is started to be matched with a speed reducer to drive the gear box body to conduct rotary cleaning, and then the cleaning liquid is filtered through a first filtering plate; and finally, the valve telescopic hose and the telescopic oil conveying hose are connected with the valve oil inlet pipe and the valve oil outlet pipe, and the lubricating oil can be filtered through the magnetic suction plate and the second filter plate, so that the purpose of conveniently cleaning, filtering and maintaining the gear box is achieved.

The present invention provides an engine fuel supply device, which relates to the technical field of aviation engine fuel supply control devices. The device includes a valve body, on which an oil filter, an ignition circuit electromagnet, an accumulator, a fuel supply circuit electromagnet and an electric pump are installed. The valve body is provided with a first oil delivery channel, a fuel supply valve oil outlet channel and a fourth oil delivery channel. The oil liquid in the first oil delivery channel is input into the oil filter, the accumulator, the fuel supply circuit electromagnet and the fuel supply valve oil outlet channel through the electric pump. The oil liquid in the first oil delivery channel is input into the oil filter, the accumulator, the ignition circuit electromagnet and the fourth oil delivery channel through the electric pump. Through the same valve body, the switching of the fuel supply pipeline is realized. By controlling the ignition circuit electromagnet and the fuel supply circuit electromagnet, the control of the oil liquid supply flow rate is realized. Overall, an integrated structure is formed, reducing the pipeline layout and connection, reducing the space occupation, providing convenience for the structural layout of the engine and reducing the difficulty.

The utility model provides a quick-change pipeline operating system for an excavator and the excavator, and belongs to the technical field of engineering machinery. The hydraulic system comprises a main valve, a pilot oil source valve, a quick-change electromagnetic valve, a main valve oil way, a pilot oil way and a quick-change oil way, the main valve is provided with a Pp high-pressure oil port; the main valve oil way comprises a first main valve oil way and a second main valve oil way; one end of the pilot oil source valve is connected with the Pp high-pressure oil port through the first main valve oil way, and the other end of the pilot oil source valve is connected with an execution element through the pilot oil way. One end of the quick-change electromagnetic valve is connected with the Pp high-pressure oil port through the second main valve oil way, and the other end of the quick-change electromagnetic valve is connected with a quick-change device through the quick-change oil way. The pilot oil way and the quick-change oil way are separated, the quick-change electromagnetic valve is arranged on the quick-change oil way, and the effect of meeting various quick-change pressure requirements is achieved by adjusting the pressure reducing valve of the quick-change electromagnetic valve.

The present invention relates to an excavator. To solve the problem of unbalanced operation of the two oil pumps in an excavator with a dual-pump configuration, the present invention constructs a hydraulic oil supply control system, method, control device, and excavator. The control system includes a first oil pump, a first main valve, a third main valve, a second oil pump, and a second main valve whose oil inlet is connected to the second oil pump. The first main valve and the third main valve oil inlet are both connected to the first oil pump. The control system also includes: an oil supply distribution valve connected between the oil inlet of the third main valve and the second oil pump for controlling the on-off of the oil supply line between the third main valve and the second oil pump; a detection device for detecting the life parameters of the oil pumps; a controller for calculating the remaining life value of the corresponding oil pumps based on the life parameters; and controlling the displacement of each oil pump and the on-off of the oil supply distribution valve based on the remaining life value of the oil pumps when the third main valve is switched. The present invention realizes oil supply coordination between the two pumps, achieves balanced operation of the two pumps, and prevents premature excessive wear and failure of one pump.

The invention relates to a hydraulic valve with a non-contact valve element position detection function and a control method of the hydraulic valve. The hydraulic valve comprises a valve body, a valve element, a laser displacement sensor, a pressure sensor and a driving unit. The valve element is arranged in the valve body, one end of the valve element is connected with the driving unit, the other end of the valve element is provided with a detection part, the laser displacement sensor is arranged in front of the detection part, the detection part moves within the detection range of the laser displacement sensor, and the laser displacement sensor emits laser towards the end face of the detection part and receives reflected light of the end face of the valve element at a certain angle. The valve body is provided with a working oil port, an oil inlet and an oil return port in the axial direction, the working oil port is communicated with an external load, and the pressure sensor is arranged at the working oil port. Compared with the prior art, accurate, reliable and efficient detection of the displacement of the valve element is achieved through the non-contact laser displacement sensor, the on-off state, the flow size and the flow direction of a valve oil port are conveniently controlled, and accurate control and reliable operation of a whole hydraulic system are facilitated.

The utility model discloses a simple valve oil seal installation tool which comprises a support, two sets of long-strip nuts, a stud and a sleeve, the two sets of long-strip nuts comprise the first long-strip nut and the second long-strip nut, and the first long-strip nut and the second long-strip nut are arranged on the left side and the right side of the lower end of the support respectively. The stud comprises a first stud and a second bolt, the first stud is arranged in the first long-strip nut, the second stud is arranged in the second long-strip nut, a base is arranged on the first stud and used for fixing the bottom of the air valve, a sleeve is arranged on the second bolt, and an oil seal is installed on the sleeve in a downward pressing mode. Compared with a traditional manual installation method, rapid and accurate installation of the oil seal is achieved in a mechanical mode, the installation time is greatly shortened, and the working efficiency is improved.

The utility model relates to the technical field of oil cylinders, and discloses a quick-closing valve oil cylinder assembly which comprises an oil cylinder shell, the left side of the oil cylinder shell is communicated with a pressure stabilizing cylinder, an oil inlet is formed in the top end of the right side of the outer wall of the pressure stabilizing cylinder, and a pressure top plate is connected to the lower middle portion of the inner wall of the oil cylinder shell in a sliding mode. A top rod is fixedly connected to the bottom end of the pressure top plate, a rotating shaft is arranged in the middle of the right side of the oil cylinder shell, a reversing rod is fixedly connected to the right side of the rotating shaft, a reversing ball is fixedly connected to the left side of the rotating shaft, and the reversing ball is arranged in the middle of the inner wall of the oil cylinder shell. The right side of the top wall and the right side of the bottom wall of the reversing ball are each provided with a straight-through groove, and the two straight-through grooves communicate with each other. According to the hydraulic oil cylinder, the reversing rod is operated to enable the reversing ball fixedly connected with the left side of the rotating shaft to rotate, so that different flow direction states are achieved, control over hydraulic oil and flow direction switching are achieved, and the requirement for rapid closing of the oil cylinder is met.

The invention discloses an anti-backflow compact distribution valve suitable for a high-pressure upward conveying working condition, which comprises a suction valve shell, a transition shell and a discharge port shell, a discharge port of the suction valve shell is communicated with a feed port of the transition shell, and a discharge port of the transition shell is communicated with a feed port of the discharge port shell; a suction valve oil cylinder with a piston rod is arranged at the top of the suction valve shell, the piston rod of the suction valve oil cylinder extends into a working cavity of the suction valve shell, a suction cone valve is arranged at the end, extending into the working cavity of the suction valve shell, of the piston rod of the suction valve oil cylinder, a port B is formed in the side end of the suction valve shell, a suction valve seat is arranged on the inner side of the port B, and a port C is formed in the side end of the transition shell. A pressure valve oil cylinder with a piston rod is arranged at the top of the discharging port shell, the piston rod of the pressure valve oil cylinder penetrates through a working cavity of the discharging port shell, a pressure cone valve is arranged at the end of a feeding port of the discharging port shell, a pressure valve seat is arranged on the inner side of the feeding port of the discharging port shell, and a discharging port is formed in the discharging port shell.

The application discloses a double-valve oil injector reliability test system, and belongs to the technical field of monitoring of test systems, and comprises a fuel supply and recovery subsystem, an oil tank, an oil injection part, an oil injector tool and a control unit, the inlet end of the oil injection part is communicated with the oil tank, the outlet end of the oil injection part is communicated with the oil inlet end of the double-valve oil injector through the oil injector tool, the oil injector tool is further used for bearing the oil injector and taking fuel, and the control unit is used for controlling fuel pressure, fuel injection amount and fuel injection frequency; and a monitoring subsystem is used for controlling and monitoring the operation of the fuel supply and recovery module and comprises an image acquisition module, wherein the image acquisition module is used for acquiring spray characteristic images of the double-valve oil injector. The application can timely monitor whether the double-valve oil injector leaks oil.

The invention relates to a multi-high-speed switch valve collaborative load port independent system and a control method thereof, and belongs to the technical field of high-speed switch valve electro-hydraulic control. The system is composed of a hydraulic transmission structure and an electric control system and mainly comprises an asymmetric hydraulic cylinder, six high-speed switch valves, a displacement sensor and two pressure sensors. Wherein the four high-speed switch valves form a full-bridge loop to achieve independent control over two cavities of the actuator, and the two oil return branches are each connected with one high-speed switch valve in parallel to form a parallel oil return valve set so as to improve the oil return through-flow capacity. According to the control method, a single-valve oil return mode and a parallel flow expansion oil return mode are set, and mode switching is conducted according to a speed threshold value or a back pressure error threshold value; on the basis, a self-adaptive robust controller is designed to achieve pressure-flow compound control, and then position tracking and backpressure stable control are achieved. While the structure is kept compact and easy to integrate, high-precision control and low energy consumption of the system can be considered.

The utility model discloses a novel non-stop ash discharging device for a fixed bed gas producer, belongs to the field of devices for fixed bed gas producers, and aims to provide a non-stop ash discharging device which improves the working efficiency, reduces the emission of toxic and harmful gases and completely eradicates safety accidents. The sealing structure comprises an upper valve, an upper valve oil cylinder, an oil cylinder support, a sealing filler assembly, a valve rod, a valve element, a transition short section, an ash hopper, an ash discharging round door and an ash discharging oil cylinder, the upper valve is provided with the transition short section, an original ash discharging square opening is transited into a round opening, the round opening is provided with a sealing face, the sealing effect is better, two sealing assemblies are arranged on the outer side of the valve rod, and the valve rod is sealed without air leakage.

The utility model discloses a valve oil seal packing and dismantles protection frock, the utility model discloses a left clamping rod, right clamping rod, rivet, protection clamping seat, antiskid cover, first adjusting assembly, spring and second adjusting assembly, and right clamping rod rotationally connected in the right side of left clamping rod, and rivet fixedly arranged on left clamping rod and right clamping rod, and protection clamping seat fixedly arranged at the bottom of left clamping rod and right clamping rod, and the inboard of protection clamping seat has the first buffer pad, and antiskid cover fixedly arranged at the top of left clamping rod and right clamping rod, and the outside of antiskid cover is provided with antiskid line, and first adjusting assembly fixedly arranged at the right side of left clamping rod, and spring fixedly arranged at the right side of first adjusting assembly, and second adjusting assembly fixedly arranged on spring and right clamping rod. The utility model discloses a first adjusting assembly, spring and second adjusting assembly can be continuously clamped valve oil seal, save time and labour, can adjust the clamping force simultaneously, avoid the valve oil seal to be pressed and be broken.

The utility model discloses a blade angle adjusting device for dynamically adjusting a fan blade, which comprises a parallel double-pump oil path communicated with an oil tank, a double-cylinder filter connected behind the parallel double-pump oil path, a high-pressure ball valve connected behind the double-cylinder filter and leading to an oil outlet, and a pressure adjusting branch connected between the double-cylinder filter and the high-pressure ball valve. The switching of the two parallel pilot pressure regulating valve oil ways is realized through a plate type three-way valve; the oil paths of the parallel pilot-operated pressure regulating valves are connected with the oil paths of the parallel duplex coolers; and oil ways of the parallel duplex coolers are communicated with the oil tank. The blade angle of the fan blade is convenient to adjust, and the working effect is improved.

The invention discloses an oil distribution cycloid hydraulic motor of a motorized reversing valve. The end faces of the two sides of the shell are connected with an output shaft and a rear cover respectively, a shell cavity is formed between the output shaft and the rear cover, an annular stator is arranged in the shell cavity, an oil distribution valve element is installed inside the periphery of the stator, a rotor is installed in the middle of the stator, and a plurality of pin teeth are arranged between the outer periphery of the rotor and the inner periphery of the stator. A plurality of through holes are formed in the middle of the rotor, a pin shaft is installed in each through hole in a clearance fit mode, a thrust plate is arranged in a shell cavity between the stator and the rear cover, and the two ends of each pin shaft penetrate through the side cover plates and then are inserted into blind holes of the output shaft and the thrust plate in a radial moving mode respectively. The cycloid hydraulic motor is compact in structure, is innovatively designed to drive the cycloid hydraulic motor to operate based on a valve oil distribution form, adopts a maneuvering valve reversing mechanism, has higher reliability, and is suitable for working scenes with limited use space, low rotating speed, large torque and higher power density ratio requirements.

The utility model belongs to the technical field of walking mechanical equipment, and particularly relates to a steering and braking hydraulic system and a walking machine.The steering and braking hydraulic system comprises a one-way stable flow divider valve, a braking unit and a steering unit, the one-way stable diverter valve is arranged on the pumping oil way and comprises a diverter valve oil inlet, a first diverter valve oil outlet and a second diverter valve oil outlet; the brake unit is arranged on a brake oil outlet path connected with an oil outlet of the first flow divider valve; the steering unit is arranged on a steering oil outlet way connected with an oil outlet of the second flow dividing valve, and the steering oil outlet way and the braking oil outlet way are arranged in parallel. In the application, the braking unit and the steering unit are connected with the same pumping oil path by adopting the one-way stable diverter valve, so that the braking unit and the steering unit share the same hydraulic oil source, and the same hydraulic oil source can be used for the braking unit and the steering unit to realize corresponding functions at the same time; and the number of hydraulic elements of the steering and braking hydraulic system is reduced.

The utility model provides a proportional pressure valve with a pressure closed loop and a hydraulic control system. The proportional pressure valve with the pressure closed loop comprises a main valve part, a pilot valve part, a pressure sensor and a control unit. The main valve part comprises a main valve body, a main valve element and a main valve reset spring. A main valve cavity and a spring cavity are formed in the main valve element. The main valve cavity is isolated from the spring cavity through the main valve element, and the main valve oil inlet is communicated with the spring cavity through a pilot control oil way. A proportional electromagnet of the pilot valve part controls the opening pressure of the pilot valve part based on the input; under the condition that the hydraulic oil pressure of the main valve oil inlet is larger than the opening pressure of the pilot valve part, the pilot valve part enables hydraulic oil in the spring cavity to be discharged, so that the main valve element moves to the opening position; the pressure sensor obtains the real-time pressure of hydraulic oil in the pilot control oil way; the control unit controls input of the proportional electromagnet based on the real-time pressure, obtained by the pressure sensor, of the hydraulic oil in the pilot control oil way, so that the real-time pressure of the hydraulic oil in the pilot control oil way is kept at the set pressure.

The invention relates to the technical field of main throttle valve hydraulic servo-motors, in particular to a method for automatically modifying the maintenance rate of a medium-pressure control valve of a 330MW steam turbine. The method comprises the following steps that initial setting is carried out, testing conditions are checked before a main throttle valve full-stroke activity test is prepared; setting the input test, namely setting the input test after confirming that test conditions are met; the maintenance rate is adjusted after a test permission button is input; a full-stroke activity test is executed, wherein the full-stroke activity test is executed after the maintenance speed is adjusted; the test quit setting is performed after the test is completed; the maintenance speed is recovered after the test permission button is withdrawn; and the monitoring and evaluation module is used for continuously monitoring the action condition of the medium-voltage control valve and the running state of the unit in the whole process and evaluating the test result after the test is completed. According to the method, the maintenance rate of the medium-pressure control valve of the 330MW steam turbine can be automatically modified.