4974 results about "Oil intake" patented technology

Proposed is a transmission (100) comprising a transmission gear (107), which is arranged in a transmission housing (140) and arranged in an oil sump (150), wherein the transmission (100) further comprises an oil-guiding channel component (1) having a guide channel (2) and at least one oil collection region (13a) for collecting oil conducted through the guide channel (2), wherein the oil collection region (13a) comprises a drain (15a), wherein the oil-guiding channel component (1) is arranged in the transmission housing (100) such that oil raised from the oil sump (150) by the transmission gear (107) during operation enters an inlet port (11) of the guide channel (2) and passes along the oil guidance direction (F) of the guide channel (2) to an outlet port (12) of the guide channel (2). According to the invention, the at least one oil collection region (13a) comprises a first reservoir (13), wherein the first reservoir (13) comprises a first reservoir wall (25) and a first reservoir base (24), wherein, in a specified mounting state of the oil-guiding channel component (1), the inlet port (11) is located at the end face of the at least one transmission gear (107), while the first reservoir base (24) is located above the transmission gear (107), and the oil guidance direction (F) from the inlet port (11) to the outlet port (12) extends opposite the direction of gravity (G).

The invention discloses a hydraulic loading system for a semi-physical simulation platform of an excavator. The hydraulic loading system comprises a loading pump set, a confluence switching valve set, a movable arm linkage loading valve set, a bucket rod linkage loading valve set, a bucket linkage loading valve set, a rotation linkage loading valve set, a flow detection assembly, a pressure detection assembly, a multi-way valve and an excavator power unit. Oil inlet ports of all the multi-way valves provide oil inlet through an excavator power unit, flow of oil return ports of a movable arm link, a bucket rod link and a bucket link provides an oil source through a loading pump set, loading valve sets simulate loading load pressure, and the oil return amount and the oil return back pressure are controlled through speed regulating valves of all the loading valve sets. And the rotary unit controls the oil return quantity and simulates the rotary load through a rotary loading valve group. Multi-pump-set loading is adopted, the loading flow range is large, universality is high, an execution oil cylinder and an execution motor do not need to be installed and replaced, and operability is high; the oil inlet and return flow and pressure of the movable arm unit, the bucket rod unit and the bucket unit are independently loaded and are not limited by the area ratio of two cavities of an oil cylinder.

The present invention relates to the field of construction machinery, and in particular to a tensioning force control device for prestressed sleepers. The present invention solves the problems of a large prestress deviation and low tensioning positioning efficiency during tensioning of prestressed steel wires. The device comprises a tensioning module, a tensioning rod and a locking module. The tensioning module comprises a tensioning jack and a tensioning rod connector. The tensioning jack comprises a plurality of cylinder bodies provided with piston rods. Oil injection cavities of the plurality of cylinder bodies are communicated and oil return cavities thereof are also communicated. The piston rods are connected to the tensioning rod connector. The tensioning rod connector is temporarily connected to the tensioning rod when in use. The outer wall of the tensioning rod is provided with a nut gear in threaded fit with the tensioning rod. The tensioning rod is provided with a tensioning stepped hole. The locking module comprises a locking motor and a locking gear that is engaged with the nut gear when in use. The locking motor is connected to the locking gear. Each piston rod is used for tensioning one prestressed steel wire, and synchronized oil intake and return for the plurality of piston rods are achieved, alleviating the overlarge prestress deviation between the prestressed steel wires. The locking module allows for time-saving and labor-saving tensioning positioning.

The invention discloses a hydraulic system and equipment for testing a hydraulic valve, and belongs to the technical field of hydraulic systems. An oil inlet of the hydraulic pump is connected with the oil tank; the tested valve comprises a plurality of inlets and outlets; one oil way of an oil outlet of the hydraulic pump is connected with the pressure regulating oil way, and the other oil way is connected with an oil inlet of the cartridge check valve; the pressure adjusting oil way adjusts the oil outlet pressure of the hydraulic pump; one oil way inserted into the oil outlet of the one-way valve is connected with a control oil way; the control oil way is used for adjusting the on-off and pressure of control oil of the tested valve; the other oil way is connected with an oil inlet of a proportional speed regulating valve, an oil outlet of the proportional speed regulating valve is connected with an oil inlet of a plug-in mounting type direction valve group, an oil outlet of the plug-in mounting type direction valve group is connected with an inlet of a tested valve, and a control cavity of the plug-in mounting type direction valve group is connected with an electromagnetic directional valve; an outlet of the tested valve is connected with the hydraulic cylinder and the throttling oil way. The hydraulic valve testing device can be suitable for testing high-pressure environments of various types of hydraulic valves.

The invention discloses a pressure feedback type damping self-adjusting energy feedback oil gas suspension and a working method, and belongs to the field of vehicle oil gas suspensions. The pressure feedback type damping self-adjusting energy feedback oil gas suspension comprises a first-stage small-range damping multi-stage adjuster, a second-stage large-range damping multi-stage adjuster and a one-way energy feedback and energy recovery system, an oil outlet of the first-stage small-range damping multi-stage regulator is connected with an oil inlet of the one-way energy feedback and energy recovery system through an oil inlet pipe, an oil outlet of the one-way energy feedback and energy recovery system is connected with an oil inlet of the first-stage small-range damping multi-stage regulator through an oil return pipe, and a throttling valve is arranged on the oil inlet pipe. And pipelines at the two ends of the two-stage large-range damping multi-stage regulator are arranged on the two sides of the throttle valve on the oil inlet pipe in parallel. The working number of damping holes of the suspension system can be changed, self-adaptive adjustment of damping of the suspension system under the condition that the stroke is changed is achieved, power equipment is not needed, and automatic damping adjustment can be achieved through a mechanical structure. And damping vibration attenuation energy consumption recovery is realized.

The invention discloses a stator and oil injection assembly integrated oil cooling motor, a stator assembly is fixed in a casing, the stator assembly, a rotor assembly and the casing form a cooling cavity, the rotor assembly passes through the inner side of the stator assembly and is rotatably connected with the casing, and a rotating shaft oil duct communicated with the cooling cavity is arranged in the rotor assembly; the inner side of the end part of the stator assembly is provided with an oil injection assembly with an inclined flow guide hole, and the end part of the stator assembly is provided with a corresponding through hole, so that the internal oil duct of the outer circle of the stator core, the oil injection assembly and the cooling cavity are communicated; an oil inlet and an oil outlet are formed in the machine shell, cooling oil input from the oil inlet firstly flows through an internal oil channel to cool a stator iron core and then is guided and sprayed to an end winding through an inclined flow guide hole of an oil spraying assembly integrally installed on the stator assembly and a through hole in the end of the stator assembly, and cooling oil input from the rotor assembly firstly cools the interior of the rotor assembly and then cools the interior of the rotor assembly. And then the cooling oil is sprayed to the inner ring surface of the winding and is discharged through the oil outlet. The cooling device has the advantages of being compact in structure and remarkable in cooling effect.

The invention discloses a balance valve, a hydraulic control system and an operation machine. A valve cavity is formed in a valve body of the balance valve, and an oil inlet and an oil return opening are formed in the circumferential wall of the valve cavity; the valve element and the control piston are inserted into the valve cavity in a sliding mode from the two axial ends, the valve element comprises a first element body and a second element body which is inserted into the first element body in a sliding mode in the axial direction, and a first concave part and a second concave part which are arranged at intervals in the axial direction are formed in the peripheral wall of the first element body. A first cavity and a second cavity are respectively formed between the first concave part and the inner peripheral wall of the valve cavity and between the second concave part and the inner peripheral wall of the valve cavity, so that the overflowing area between the first core body and the valve cavity can be increased, and the oil inlet and the oil return port are respectively and correspondingly communicated with the first cavity and the second cavity; the driving end of the control piston penetrates through the first core body, the control piston and the second core body are coaxially and oppositely arranged in a spaced mode, and the control piston moves in the axial direction to drive the second core body to move in the axial direction and drive the first core body to move, so that oil in the first cavity and oil in the second cavity are communicated or blocked.

The invention discloses a fitting for an electric power circuit, and particularly relates to the technical field of circuit installation, the fitting comprises an equipment main body, a connecting part, a lubricating part and an oil storage part, the equipment main body comprises a ship body provided with a first through hole, the lower side of the ship body is provided with a fixing assembly, and the connecting part comprises a movable plate provided with a second through hole and a first rotating shaft; a second rotating shaft is inserted into the second through hole, the lubricating part comprises a rotating ring and a shell, a control assembly and an oil spraying assembly are arranged in the shell, an oil inlet is formed in the shell, the oil storage part comprises an oil storage box, and an oil conveying pipe is arranged on the lower side of the oil storage box. According to the suspension clamp, the lubricating part and the oil storage part are arranged, the lubricating part can automatically adjust use of lubricating oil, abrasion between parts is reduced, the service life of the suspension clamp is prolonged, waste of the lubricating oil can be reduced, the lubricating oil can be conveniently added by technicians through the external oil storage box, the service life of the suspension clamp is prolonged, and the use cost is reduced.

The invention relates to the technical field of automobiles, in particular to an automobile full-active suspension system which comprises a shock absorber assembly, an external electromagnetic valve assembly and a two-way hydraulic pump, the shock absorber assembly comprises a piston rod, a first hydraulic cavity and a second hydraulic cavity, and the piston rod is arranged in the first hydraulic cavity; the external electromagnetic valve assembly comprises a valve block, a compression electromagnetic valve and a recovery electromagnetic valve, a first flow channel and a second flow channel which penetrate through the two opposite ends of the valve block are formed in the valve block, and the compression electromagnetic valve and the recovery electromagnetic valve are arranged on the valve block and can communicate with the first flow channel and the second flow channel correspondingly. The first ends of the first flow channel and the second flow channel are respectively communicated with an oil inlet and an oil return port of the bidirectional hydraulic pump, and the second ends of the first flow channel and the second flow channel are respectively communicated with the first hydraulic cavity and the second hydraulic cavity; the compression electromagnetic valve and the recovery electromagnetic valve are integrated on the valve block, and damping adjustment of the external electromagnetic valve assembly on the shock absorber is not affected, so that the installation position of the external electromagnetic valve assembly is not limited, and the external electromagnetic valve assembly is flexibly arranged.

The utility model relates to the technical field of oil filtering, and discloses an oil filtering structure of an oil filter, which comprises an oil filtering tank, the bottom of the oil filtering tank is fixedly connected with a support column, one side of the oil filtering tank, which is opposite to the support column, is communicated with an oil inlet, the inner wall of the oil filtering tank is fixedly connected with a baffle ring, the baffle ring is provided with a butt joint groove, and the butt joint groove is communicated with the oil inlet. A conical plate is fixedly connected to the inner wall of the baffle ring, a plurality of first filtering holes are formed in the conical plate, and a motor is fixedly connected to the position of a center shaft of the side, away from the supporting column, of the oil filtering tank. Oil liquid is filtered through the first filtering holes in the conical plate, due to the fact that the conical plate is conical, large-particle impurities left above the conical plate can slide down along the conical plate and finally fall above the baffle ring, meanwhile, the motor operates to drive the rotating rod to rotate, the rotating rod can drive the cleaning brush to rotate along the top of the conical plate, and the cleaning brush can clean the oil liquid. The surface of the conical plate can be effectively cleaned, and some impurities are prevented from being clamped in the first filtering holes to influence the filtering speed.

The invention discloses an opening and closing hydraulic system and a control method. The system comprises an oil cylinder, an oil tank, an energy accumulator, a pump set, a detection module, an opening and closing loop and an adjusting loop. The connecting end of the opening and closing loop is connected with a rod cavity and a rodless cavity of the oil cylinder, and an oil inlet of the opening and closing loop is in redundant connection with the energy accumulator and the pump set. The detection module is used for monitoring the slurry outlet amount of a material opening and the position of an oil cylinder; the adjusting loop is connected to the opening and closing loop in parallel and suitable for controlling the oil cylinder to adjust the opening degree of the material opening according to the monitoring result of the detection module. The method is applied to the system. The device has the beneficial effects that the opening degree of the material opening can be accurately controlled through the adjusting loop, and manual adjustment is not needed; and closed-loop control is performed through the flow rate of slurry at the material port, the opening degree of the material port is adjusted in real time, and the stability of the discharging amount is ensured.

Disclosed is a hydraulic control system for safe rapid opening or closing of a valve. The hydraulic control system comprises a hydraulic cylinder (71), a pressure oil line (141), an oil return line (151), an oil drain line (161), a quick oil return line (171) and a valve manifold (181), wherein the inside of the valve manifold is provided with a three-position four-way directional control valve (51), a bidirectional hydraulic lock (31), a first two-position four-way directional control valve (61) and an energy accumulator (191); a first cartridge valve (101) is connected between the oil drain line and a rod cavity of the hydraulic cylinder, and a pilot port of the first cartridge valve is connected to a port A of the first two-position four-way valve; an oil inlet of the energy accumulator is connected to each of the pressure oil line and the oil return line, a first check valve (81) is connected between the oil inlet of the energy accumulator and the pressure oil line, and a second cartridge valve (102) is connected between the first check valve and the energy accumulator; and the second cartridge valve is connected to a rodless cavity of the hydraulic cylinder, and a pilot port of the second cartridge valve is connected to the port A of the first two-position four-way directional control valve. The hydraulic control system for safe rapid opening or closing of a valve allows for safe rapid opening or closing of a valve.

A constant-flow control valve group, an auxiliary arm control module, a complete hydraulic system, and a crane. The constant-flow control valve group comprises: a cartridge valve; a cartridge reversing valve, comprising a working oil port on one side and a main oil return port and a reversing valve oil inlet selectively connected to the working oil port on the other side, the working oil port being connected to a control oil port of the cartridge valve, and the reversing valve oil inlet being connected to a main oil inlet of the cartridge valve; and a feedback on-off valve, disposed in a working feedback oil path connected between the main oil inlet of the cartridge valve and a main feedback oil port of the constant-flow control valve group. The auxiliary arm control module comprises the constant-flow control valve group and a main reversing valve. The complete hydraulic system comprises the auxiliary arm control module and an auxiliary arm luffing cylinder, and may further comprise a load-sensitive oil pump and a main valve. The present application can achieve the effect of directly connecting an auxiliary arm hydraulic system to an existing complete hydraulic system as a sub-module without altering the original system.

The present invention discloses an improved structure of an oil channel of an oil filter base assembly in a vehicle, including an oil filter base, where a lower portion of the oil filter base is provided with an oil inlet, an oil outlet, and an oil return port, an end portion of the oil filter base is provided with an antifreeze solution water inlet, a bottom portion is provided with a first water outlet and a second water outlet that are communicated with the antifreeze solution water inlet, a filter cartridge and a bypass valve are mounted in one end of the oil filter base, a filter cover is connected to an end portion of one end, close to the bypass valve, of the oil filter base, an oil cooler is mounted on an upper portion of one end, away from the filter cartridge, of the oil filter base.

The steering system comprises an oil tank, an oil pump, an electromagnetic valve, a steering gear, a first oil cylinder, a second oil cylinder and a flow amplifying valve, the oil pump extracts hydraulic oil from the oil tank and provides pressure oil through an oil outlet of the oil pump, and the electromagnetic valve is provided with a first electromagnetic valve position and a second electromagnetic valve position and used for switching oil paths. The steering gear is provided with an oil inlet, an oil return port, an L oil supply port and an R oil supply port, oil is distributed according to a steering instruction, when the electromagnetic valve is located at a first electromagnetic valve position, a first oil cylinder small cavity and a second oil cylinder large cavity are controlled to obtain oil or the first oil cylinder large cavity and the second oil cylinder small cavity are controlled to obtain oil to achieve rapid rotation, and when the electromagnetic valve is electrified and located at a second electromagnetic valve position, the steering gear is driven to rotate. The hydraulic oil bypasses the flow amplifying valve and directly enters the first oil cylinder large cavity or the second oil cylinder large cavity, so that low-speed steering operation is completed, the high-speed steering effect and the low-speed steering effect are achieved, the applicability, stability, accuracy and economical efficiency of a steering system are improved, and the requirements of different users are met.

The utility model discloses a positive displacement gear lubricating pump which has the advantages of being simple in structure and capable of effectively reducing installation and machining requirements. The device comprises a driving motor, a pump seat, a mounting seat, an oil tank, a gear pump, an oil suction pipe and an oil outlet pipe, the pump seat is mounted above the oil tank and seals the oil tank, the mounting seat is mounted on the pump seat, the driving motor and the gear pump are mounted above and below the mounting seat respectively, and the driving motor is connected with the gear pump and drives the gear pump to operate. The gear pump is arranged in the oil tank, the first end of the oil suction pipe is communicated with an oil inlet of the gear pump, the second end of the oil suction pipe extends to the bottom of an inner cavity of the oil tank, and the first end of the oil outlet pipe is communicated with an oil outlet of the gear pump.

An oil-cooled motor includes a casing, a rotor, and a stator. The casing is internally provided with an accommodating cavity. The rotor and the stator are accommodated in the accommodating cavity. The stator includes a stator core coaxially surrounding an outer side of the rotor. The stator core includes a first oil cooling channel, a second oil cooling channel, and a first end and a second end in an axial direction of the rotor. The first oil cooling channel penetrates the stator core from the first end to the second end, forming a first oil inlet in the first end and forming a first oil outlet in the second end. The second oil cooling channel penetrates the stator core from the first end to the second end, forming a second oil inlet in the second end and forming a second oil outlet in the first end.

The invention provides a one-way valve. The one-way valve comprises a valve body, a one-way valve element assembly and a locking valve element assembly. The valve body is provided with an oil inlet, an oil outlet, a first containing cavity and a second containing cavity, the locking valve element assembly is partially located in the second containing cavity, and the locking valve element assembly is configured to be located at the first end of the second containing cavity so as to block the first end of the second containing cavity when the oil pressure of the oil inlet is not higher than a threshold value; when the oil pressure of the oil inlet is higher than the threshold value, the first end of the first containing cavity is driven by oil to move towards the second end of the second containing cavity, so that the first end of the first containing cavity communicates with the oil inlet; the one-way valve element assembly is located in the first containing cavity, and when the first end of the first containing cavity is not communicated with the oil inlet, the one-way valve element assembly moves to the first end of the first containing cavity so as to cut off the oil inlet and the oil outlet. The service life of the one-way valve can be prolonged.

The invention discloses a power generation and driving integrated device with an active lubricating system. The power generation and driving integrated device comprises a motor shell, a motor, a planetary gear mechanism, a transmission gear set, a filter, an electronic pump, a flywheel shell and a motor shell cover plate. The motor shell comprises a motor cavity for accommodating the motor and a gear cavity for accommodating the planetary gear mechanism and the transmission gear set, the flywheel shell seals the gear cavity, and the motor shell cover plate seals the motor cavity; the bottom of the gear cavity is divided into an oil suction cavity through a motor shell oil separation rib, an oil return groove is formed in the connecting position of the motor shell oil separation rib and the bottom of the gear cavity, the filter is contained in the oil suction cavity, the electronic pump partially stretches into the oil suction cavity and is connected with the filter, and an oil outlet of the filter is communicated with an oil inlet of the electronic pump. According to the invention, stable active lubrication of parts with lubrication and cooling requirements, such as shafts, gears, bearings, motors and the like, is realized. Meanwhile, gear oil stirring can be reduced, and the speed reducer efficiency is improved.

The utility model provides a rock drill impact hydraulic control valve group and a rock drill, the valve group comprises a hydraulic control reversing valve, a first throttling hole, an electric proportional overflow valve, an overflow valve, a second throttling hole, a valve body and an electromagnetic reversing valve, the valve body is provided with a pressure oil port P, an oil return port T, an oil drainage port L, an LS oil port and a working oil port A; the pressure oil port P is communicated with an oil inlet of the overflow valve and an oil inlet of the second throttling hole through a hole channel in the valve body. An oil outlet of the second throttling hole is communicated with an oil inlet of the electromagnetic reversing valve; a working oil port of the electromagnetic reversing valve is communicated with a control oil port of the hydraulic control reversing valve; the oil return port T is communicated with an oil outlet of the overflow valve; and the oil drainage port L is communicated with an oil drainage port of the electromagnetic reversing valve, and is communicated with an oil drainage port of the hydraulic control reversing valve, an oil outlet of the electric proportional overflow valve and a control oil port at the same time. Damage of pressure building to a system and elements is eliminated, and residual impact pressure existing after oil cut-off is eliminated.

The invention relates to the technical field of motor cooling, in particular to an oil-water composite cooling motor heat dissipation structure and a heat dissipation method thereof.The oil-water composite cooling motor heat dissipation structure comprises a machine shell, a stator iron core, a winding and a rotor are arranged in the machine shell, and a hollow shaft is inserted into the rotor in a penetrating mode. Water flows through the S-shaped water channel on the casing, the casing and the stator core are cooled when the water passes, most heat is taken away, and basic temperature control is maintained; cooling oil is guided into the first oil cooling channel, the second oil cooling channel and the third oil cooling channel through the oil inlets, it is guaranteed that all positions of the stator can make synchronous contact with heat dissipation oil in the first oil cooling channel, particularly, effective heat dissipation is conducted on a stator iron core, the oil enters an oil injection ring, and the cooling effect is improved. According to the utility model, oil is sprayed to a stator winding at 360 degrees circumferentially, heat dissipation is enhanced, the other two oil cooling channels guide oil to a bearing and a rotor respectively, a plurality of heating parts can be considered, a specific oil way is designed to directly cool the heating parts, the lubricating and heat dissipation efficiency is improved, and high-speed operation of the motor is realized.

Disclosed in the present invention are a crane upper and lower structure interlocking system, and a crane. In the system, a third-stage pump of a hydraulic pump set is connected to an oil inlet P of an outrigger extension and retraction valve, and an extension and retraction switching valve in the outrigger extension and retraction valve is connected to the oil inlet P of the outrigger extension and retraction valve. A first working oil port and second working oil port of a locking valve are both connected to a fifth working oil port of the extension and retraction switching valve; a third working oil port of the locking valve is connected to a rod cavity of each of a horizontal oil cylinder, a vertical oil cylinder and a fifth outrigger oil cylinder; and a fourth working oil port of the locking valve is connected to a sixth working oil port of the extension and retraction switching valve. When a boom is in a non-stowed state, the locking valve is deenergized and operates in a right-hand position; at this moment, regardless of whether the extension and retraction switching valve is in an upper position or a lower position, an oil outlet thereof is directly connected to an oil return port through the locking valve to enable pressure unloading, and the horizontal oil cylinder, the vertical oil cylinder and the fifth outrigger oil cylinder remain motionless, thereby achieving locking. The present invention can achieve unloading of an oil inlet line when misoperation of an outrigger handle occurs during upper-structure operation, achieving the locking function against misoperation.

The utility model discloses a three-way adjustable pressure compensation speed regulating valve which comprises a valve sleeve and a threaded sleeve which are in threaded connection, a valve element is arranged in the valve sleeve, an oil inlet, a bypass opening and a priority oil opening are formed in the valve sleeve, an axial hole and a radial hole are formed in the valve element, the front end of the valve element is detachably matched with a throttling plug, and the front end of the throttling plug is provided with an oil inlet, a bypass opening and a priority oil opening. A throttling plug is fixed to the rear end of the valve element, a throttling hole is formed in the center of the throttling plug, a damping screw plug is fixed to the rear end of the valve element, a damping hole is formed in the center of the damping screw plug, and a pressure adjusting assembly mainly comprising a compensation spring is arranged at the rear end of the threaded sleeve. The utility model has the advantages that the structure is simple and reasonable, and the adjustment of supplementary pressure is realized under the condition that the size of the throttling hole is kept unchanged.

A winch hydraulic control system includes a hydraulic oil tank, a hydraulic pump, and an electric motor. The hydraulic pump's oil inlet is connected to the hydraulic oil tank, the electric motor is connected to the hydraulic pump, and the hydraulic pump's oil outlet is connected to both port P of the main reversing valve assembly and port P of the control valve assembly. Ports A and B of the main reversing valve assembly are connected to port A of the first shuttle valve, port A of the balancing valve assembly, and port B of the control valve assembly, respectively. Port X is connected to port B of the second solenoid reversing valve. Ports B and C of the first shuttle valve are connected to port B of the balancing valve assembly and port B of the second shuttle valve, respectively. A third pressure reducing valve is connected in parallel with the second solenoid valve. Port P of the second solenoid reversing valve is connected to port X of the control valve assembly, port A of the second shuttle valve, and port SP of the balancing valve assembly. Port C of the second shuttle valve is connected to the rod chamber of the brake. The brake is connected to the hydraulic motor, and the oil outlet of the control valve assembly is connected to the oil inlet of the balancing valve assembly. This design can maintain constant wire rope tension and stable operation.

The invention discloses an unmanned mining dump truck hydraulic braking system and a control method. The unmanned mining dump truck hydraulic braking system comprises a service brake valve set and a parking brake valve set. The service brake valve group comprises a first hydraulic proportional pressure reducing valve, a second hydraulic proportional pressure reducing valve, a first shuttle valve and a first pressure sensor; the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are connected in parallel; oil outlets of the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are communicated with an oil inlet of a first shuttle valve; an oil outlet of the first shuttle valve is connected with a first pressure sensor; the parking brake valve group comprises an electromagnetic directional valve, a redundant electromagnetic directional valve and a pressure switch; the electromagnetic directional valve is a normally closed valve, and the redundant electromagnetic directional valve is a normally open valve; the electromagnetic directional valve and the redundant electromagnetic directional valve are connected in series, the electromagnetic directional valve is connected with an oil inlet pipeline, the redundant electromagnetic directional valve is connected with an oil outlet pipeline and a parking brake caliper, and a pressure switch is arranged on the oil outlet pipeline.

The invention discloses a system and method for testing flow, displacement and hydraulic power of a main valve element. The system comprises two displacement sensors, a tested balance valve and a hydraulic testing assembly. A main valve core and a pilot valve core of the tested balance valve are coaxially and oppositely arranged; the two displacement sensors are coaxially fixed with the main valve core and the control piston respectively; the hydraulic test assembly detects the pressure of an oil return port A, a load oil port B, a feedback spring cavity pressure measuring port Pc and a pilot oil inlet X through pressure sensors; the load pressure, the pilot pressure and the oil return back pressure are controlled through a main load oil way, a pilot control oil way and an oil return back pressure oil way respectively, and meanwhile the flow of the oil return is measured through a flow meter. According to the invention, the flow, displacement and hydraulic force of the main valve core under different working conditions can be synchronously and dynamically measured.

The invention provides an oil return control method and device, a control system, a vehicle and a storage medium. A compressor lubricating system comprises a scroll compressor and an oil-gas separator connected with an air outlet of the scroll compressor; an oil outlet of the oil-gas separator is connected with an oil inlet of the scroll compressor through an oil return quantity control device; the method comprises the following steps: acquiring operation parameters of the scroll compressor; the operation parameters comprise the exhaust temperature, the suction temperature, the exhaust pressure and the suction pressure of the scroll compressor; the current oil return demand quantity of the scroll compressor is determined according to the operation parameters of the scroll compressor; and according to the oil return demand quantity and the pressure difference between the exhaust pressure and the suction pressure of the scroll compressor, the oil return capacity of the oil return quantity control device is controlled. According to the scheme, the operation efficiency of the scroll compressor can be improved.

The invention relates to the technical field of hydraulic lock testing, and discloses a hydraulic lock service life reliability testing device which comprises a testing table. The number of the load oil cylinders is two, the two load oil cylinders are arranged at the top end of the test board, and one load oil cylinder can slide relative to the test board; the two load oil cylinders are communicated with two oil ports in the top end of the hydraulic lock body respectively, and an oil outlet of one load oil cylinder is communicated with an oil inlet of the other load oil cylinder through a connecting pipe. The number of the hydraulic pumps is two, the two hydraulic pumps are arranged at the bottom end of the test board and communicate with the hydraulic lock body through reversing valves, and the other ends of the reversing valves are provided with external oil tanks through oil return pipes so that oil supply and oil return of two oil ways of the hydraulic lock body can be achieved. The hydraulic lock service life reliability testing device can effectively solve the problems that in the prior art, in the testing process, an oil pipe of a load oil cylinder is difficult to adapt to hydraulic locks with different hole pitches, and the testing work is not safe and reliable enough.

The utility model relates to the field of hydraulic braking, and discloses a parking braking system and agricultural machinery, the parking braking system comprises a parking brake, a first reversing valve, a second reversing valve and an energy accumulator, a working oil port of the first reversing valve is connected with a rod cavity of a brake cylinder of the parking brake, an oil inlet of the first reversing valve is connected with an oil inlet path, and an oil outlet of the second reversing valve is connected with an oil outlet path; an oil return port of the first reversing valve is connected with an oil return path, in a power-off state, a working oil port of the first reversing valve is communicated with the oil return port, an oil outlet of the second reversing valve is connected with the oil return path, in the power-off state, an oil inlet of the second reversing valve is communicated with the oil outlet, and the energy accumulator is connected with the oil inlet of the second reversing valve. According to the parking braking system, the situation that tires are locked when the agricultural machine loses power accidentally in the running process can be avoided, and meanwhile the agricultural machine can be slowly and stably decelerated till the agricultural machine is stopped and parked.

The utility model discloses a motorcycle engine crankshaft box body with an oil separation chamber, which comprises a crankshaft box body formed by connecting a left crankshaft box body and a right crankshaft box body, crankshaft mounting holes and balance shaft mounting holes are arranged on the left crankshaft box body and the right crankshaft box body, and the crankshaft mounting holes and the balance shaft mounting holes are distributed in a pairwise corresponding mode. An oil collecting chamber is arranged at the lower end in the crankcase body, and the balance shaft mounting hole is arranged close to the maximum oil liquid level position of the oil collecting chamber; the bottom of the oil collection chamber is provided with an oil separation chamber which is arranged close to the balance shaft mounting hole, the upper end of the oil separation chamber is close to the maximum oil liquid height of the oil collection chamber, and one side, far away from the balance shaft mounting hole, of the oil separation chamber is provided with an oil inlet hole; an engine oil filter screen is arranged in the oil separation cavity, and an oil guide channel with one end communicated with the oil separation cavity and the other end communicated with an oil inlet of the engine oil pump is arranged on the side of the oil separation cavity.