262 results about "Shuttle valve" patented technology

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 provides an impact rotary drilling hydraulic control system of a dinting machine, which belongs to the technical field of hydraulic control systems and comprises a variable pump, a pilot oil source control valve group, a proportional multi-way valve, a shuttle valve I, a one-way pressure reducing valve, a shuttle valve II, a drilling machine pilot handle group, an impact rotary drilling machine, a bidirectional hydraulic lock and a drilling machine feeding oil cylinder. According to the hydraulic control system for percussive rotary drilling of the dinting machine, the percussive rotary drilling machine can perform stepless speed regulation between two speeds, high-frequency percussive or low-frequency percussive operation can be flexibly used according to rock stratum and geological working conditions, the application range of equipment is greatly widened, and the hydraulic control system can be used for rock stratums with high hardness, weathered rock stratums and hard and brittle geology. And during low-frequency impact operation, one-key linkage operation can be realized, namely, the functions of feeding, rotating and impacting of the drilling machine can be completed by operating the impact pilot handle.

The utility model relates to a hydraulic system, in order to solve the problem that when an engine of an existing loader is started, an energy accumulator of a braking system is filled with liquid to increase the starting load of the engine, the hydraulic system of the loader comprises a liquid filling valve, a flow amplifying valve, a two-position three-way valve and a shuttle valve, an oil inlet of the prefill valve is connected with a CF port of a priority valve in the flow amplification valve; an oil inlet, an oil outlet and an oil return port of the two-position three-way valve are correspondingly connected with an S signal port of the prefill valve, a first oil inlet end of the shuttle valve and an oil tank loop, the oil outlet of the two-position three-way valve is selectively communicated with the oil inlet or the oil return port, and an LS1 signal port of the flow amplification valve is communicated with a second oil inlet end of the shuttle valve. And the oil outlet end of the shuttle valve is connected with a control signal port of the priority valve. The hydraulic system of the loader does not have a liquid filling load when the engine is started, and is easy to start.

The invention discloses a constant pressure and load sensitive switching hydraulic control system and method, and belongs to the technical field of hydraulic control, the constant pressure and load sensitive switching hydraulic control system comprises a power mechanism, a variable pump and an oil tank, the variable pump comprises a load sensitive valve, the load sensitive valve is connected with a shuttle valve outlet of a shuttle valve, and an electric proportional overflow valve is connected with the variable pump; the electric proportional overflow valve is further connected with a first inlet of the shuttle valve, a P port of the reversing valve is connected with the variable pump, and an A port of the reversing valve is connected with a second inlet of the shuttle valve; the pressure sensor assembly is used for reading the outlet pressure of the variable pump and transmitting the outlet pressure to the controller. The pressure sensor assembly is further used for reading the load-sensitive feedback pressure and transmitting the load-sensitive feedback pressure to the controller. Constant pressure and negative sensitive switching is automatically carried out along with increase of the load pressure, the load-sensitive system can be prevented from working under the low-pressure condition, and the problems that under the low-pressure condition, an execution element of the load-sensitive system is slow in action, and the system efficiency is low can be effectively solved.

The utility model discloses a double-stop-valve control structure which is characterized in that a stop valve block is arranged on a rear cover of an axial plunger closed type pump, an A-port working oil way stop valve is arranged in the stop valve block, and a B-port working oil way stop valve is arranged in the rear cover; oil drainage of the A-port working oil way stop valve and oil drainage of the B-port working oil way stop valve share one oil drainage channel, A-port working oil enters the A-port oil way stop valve through an A-port channel arranged in the rear cover, and B-port working oil enters the A-port oil way stop valve through a B-port channel arranged in the rear cover. Different cut-off pressures can be set for the working oil port A and the working oil port B of the hydraulic axial plunger closed type pump according to needs, and the hydraulic axial plunger closed type pump can cope with more complex working conditions. The oil port A and the oil port B can be independently adjusted more conveniently, meanwhile, the structure of the stop valve sleeve is optimized, the length is shortened, parts such as a shuttle valve and an ejector pin are omitted, cost is reduced, and convenience is created for manufacturing of the stop valve sleeve.

The invention belongs to the field of electro-hydrostatic actuators, and particularly relates to an electro-hydrostatic actuator structure with a high servo characteristic and a control method. Comprising a servo motor, a hydraulic pump, a hydraulic control one-way valve, a shuttle valve, an electromagnetic valve, a pressure sensor, an actuator cylinder and a controller. The servo motor is mechanically connected with the hydraulic pump, hydraulic control one-way valves are connected between the actuating cylinder and an oil inlet and outlet path of the hydraulic pump, and the pressure of remote control ports of the two hydraulic control one-way valves is switched through the two electromagnetic valves. The pressure sensors measure the pressure of the two cavities of the actuator cylinder and transmit the pressure to the controller. The two inlets of the shuttle valve are respectively communicated with the two cavities of the actuating cylinder to select the high-pressure side pressure in the oil cavity of the actuating cylinder; and the controller controls the rotating speed and the torque of the servo motor after receiving the position instruction, the motor state parameters and the data of the pressure sensor. According to the electro-hydrostatic actuator, the rotating speed overshoot of the hydraulic pump in the starting process can be reduced, and the servo characteristic of the electro-hydrostatic actuator is improved.

The present invention belongs to the technical field of rail trains, and relates to a rail train hydraulic brake system slow-release device. The present invention also relates to a control method for a rail train hydraulic brake system slow-release device. A reversing valve module (A) includes a shuttle valve (1), a first pressure switch (2), and a second pressure switch (3). A manual pump module (B) includes a manual pump (4), an oil tank (5), and a pressure relief valve (6). The shuttle valve (1) is connected to the oil tank (5) through a first pipeline (7). A manual pump (4) is provided on the first pipeline (7). The shuttle valve (1) is connected to an auxiliary relief unit (9) through a second pipeline (8). The shuttle valve (1) is connected to a clamp (11) through a third pipeline (10). The first pipeline (7) is connected to the pressure relief valve (6). The rail train hydraulic brake system slow-release device of the present invention is easy to operate, can reliably complete relief and braking, effectively prevents the risks caused by misoperation and forgetting to restore the gear position, and reduces the probability of misactivation.

The utility model relates to the technical field of hydraulic systems, in particular to an oil return compensation multi-way output hydraulic system for a tractor and the tractor, the input end of a main pump is communicated with a hydraulic oil tank, the output end of the main pump is connected with a port P of a multi-way output valve through a pipeline, and a plurality of valve assemblies are arranged in the multi-way output valve; the valve assembly is connected with a pressure feedback channel of the multi-way output valve through a shuttle valve, an oil return opening of the valve assembly is connected with an oil inlet of the pressure compensation valve through a pipeline, an oil return opening of the pressure compensation valve is communicated with the hydraulic oil tank through an oil return pipe, and an oil outlet of the shuttle valve conveys screened load pressure to a non-spring side control cavity of the pressure compensation valve. A load sensitive oil port of the valve assembly is connected with a spring side control cavity of the pressure compensation valve through a load feedback oil way. According to the utility model, multiple loads can work at the same time, and the opening of the pressure compensation valve is reduced through the screening of the shuttle valve, so that the balance of each load is obtained, and the adaptability, comfort and safety of the tractor and an executive component are higher.

The invention belongs to the technical field of engineering machinery, and discloses a brake hydraulic system and engineering machinery. According to the brake hydraulic system, service braking is adopted, reliable braking force can be provided, the two service brake valves and the electric proportional brake valve are connected in parallel, the path with the largest oil pressure is supplied to the service brake oil cylinder after judgment is conducted through the first shuttle valve and the second shuttle valve, and the service brake oil cylinder is connected with the electric proportional brake valve. Automatic signals and active operation of a driver can be perfectly coordinated, conflicts are avoided, and the system is simple and high in reliability.

The application discloses a multi-stage priority liquid filling valve and belongs to the technical field of hydraulic control valves of engineering vehicles.The valve adopts a modularized superposition structure, is composed of a liquid filling valve part and a steering priority valve part which are superposed upward and downward, is communicated through three internal oil channels, integrates a main overflow valve, a steering priority valve, a liquid filling priority valve, a liquid filling pressure regulating valve, a throttling check valve and a shuttle valve, realizes three-stage hydraulic oil supply control of steering highest priority, brake liquid filling secondary priority and working system lowest priority, and is provided with the main overflow valve at an oil inlet to realize system overpressure protection.The problems of complex priority control, incompatible load sensing and constant flow systems of valve parts, need of external main overflow valve, low universality, high development and use costs and the like are solved when a single pump source supplies oil to three or more systems.

The application discloses a hydraulic valve group, system and method for controlling axial floating of a power head with threads, relates to the technical field of hydraulic control, and discloses the following technical scheme: two oil inlets of a shuttle valve are arranged close to a third oil port and a fourth oil port and are connected with a first oil path and a second oil path respectively; a port one of a two-position three-way manual valve is connected with a drain port; an oil outlet of the shuttle valve is connected with a port three of the two-position three-way manual valve; when the two-position three-way manual valve is kept in a spring position, the port one and the port two of the two-position three-way manual valve are connected, and pilot ports of two sets of hydraulic control check valve groups are connected in parallel and return oil through the port one of the two-position three-way manual valve; the two sets of hydraulic control check valve groups are closed; when the two-position three-way manual valve is switched to a locking position, the port three and the port two of the two-position three-way manual valve are connected, the pilot ports of the two sets of hydraulic control check valve groups are connected with the port two of the two-position three-way manual valve, and the two sets of hydraulic control check valve groups are opened. The application can prolong the service life of a main shaft of a power head and a drill pipe.

The utility model relates to the technical field of valves, in particular to a pneumatic reversing shuttle valve which comprises a main valve body, an auxiliary valve body and a cylinder body, the auxiliary valve body is detachably installed on the main valve body, and a material cavity used for arranging a piston shaft is arranged between the interior of the auxiliary valve body and the interior of the main valve body in a surrounding mode. The cylinder body is detachably installed on the secondary valve body, a piston cavity used for installing a piston is formed in the cylinder body, the piston shaft extends to one end of the piston cavity to be connected with the piston, and the main valve body comprises a material inlet D and a material outlet E which are communicated with the material cavity. The secondary valve body comprises a material outlet C communicated with the material cavity and a compressed air inlet B communicated with the piston cavity, and the cylinder body comprises a compressed air inlet A communicated with the piston cavity of the cylinder body. By applying the pneumatic reversing shuttle valve, multi-direction fast switching of the material flow direction can be achieved, and the pneumatic reversing shuttle valve has the advantages of being small in size, convenient to use, good in air tightness and the like.

The application discloses a hydraulic leveling device, a hydraulic leveling method and an aerial work platform, and relates to the field of hydraulic control. The device comprises an electromagnetic reversing valve, a first bidirectional balance valve, a second bidirectional balance valve, a first leveling oil cylinder, a second leveling oil cylinder, a controller, a shuttle valve, a first electromagnetic unloading valve and a first pressure sensor. The first port and the second port of the shuttle valve are connected with the second port and the third port of the second bidirectional balance valve respectively, and the third port of the shuttle valve is connected with an oil return tank through the first electromagnetic unloading valve. The first pressure sensor is arranged on a pipeline between the shuttle valve and the first electromagnetic unloading valve and is used for detecting the first pressure in the pipeline. The controller is used for controlling the first electromagnetic unloading valve to be electrified or deenergized according to the first pressure when the initial state of the working platform is an inclined state during the start of the luffing operation. The application avoids the problem that the high pressure between the first leveling oil cylinder and the second leveling oil cylinder causes the damage of structural members.

The invention discloses a dual-mode redundancy brake-by-wire system, and relates to the technical field of vehicle braking and safety control. The dual-mode redundancy brake-by-wire system is characterized in that the oil outlet end of an oil supply pipeline is communicated with a first reversing valve; a control oil path of the driving pressure control mechanism comprises a first pressure control oil path and a second pressure control oil path, a proportional pressure reducing valve is arranged on the first pressure control oil path, and an oil outlet end of the first pressure control oil path is communicated to an oil inlet of a shuttle valve and is communicated to a corresponding driving brake through the shuttle valve; the second pressure control oil way is provided with an oil inlet pipeline and an oil drainage pipeline, an oil inlet switch valve is arranged on the oil inlet pipeline, an oil return switch valve is arranged on the oil drainage pipeline, and the oil inlet end of the oil drainage pipeline and the oil outlet end of the oil inlet pipeline are connected to the other oil inlet of the shuttle valve in parallel and communicated to the corresponding service brake through the shuttle valve. The device is used for braking and ABS sliding control under the working conditions of low attachment, heavy load and the like in an underground coal mine, and it is guaranteed that fault operation can be achieved, and safety and reliability are achieved.

An active compensation hydraulic system for a crane includes a controller, a hydraulic pump assembly, a high-frequency response valve control assembly, a proportional control valve assembly, a first locking valve assembly, a second locking valve assembly, a control mode switching valve assembly, and an actuator. The high-frequency response valve control assembly includes a one-way solenoid ball valve, a high-frequency response valve, and a first bidirectional solenoid ball valve. The proportional control valve assembly includes a proportional directional valve and a second bidirectional solenoid ball valve. The first locking valve assembly includes a first two-way cartridge valve and a first balancing valve. The second locking valve assembly includes a second two-way cartridge valve, a second balancing valve, a first shuttle valve, and a first hydraulically controlled directional valve. The control mode switching valve assembly includes a first solenoid directional valve and a second solenoid directional valve. This system features a high-precision active compensation control mode and a simple and reliable proportional control mode, which can be switched between each other, resulting in high system safety and reliability.

The utility model provides an excavator standby hydraulic system and a control method thereof, and belongs to the technical field of engineering machinery, the excavator standby hydraulic system comprises a standby hydraulic system, the standby hydraulic system is connected with a hydraulic oil tank and a main valve, the standby hydraulic system comprises a standby pump, and an outlet of the standby pump is connected with an inlet of a diverter valve; a first outlet of the diverter valve is connected with a first inlet of the main valve, and a second outlet of the diverter valve is connected with a first inlet of the shuttle valve. By arranging the standby hydraulic system, normal action of the excavator can be guaranteed when the main hydraulic system breaks down, and the situation that the engineering progress is affected due to the fact that the excavator cannot move is avoided.

The invention provides a load self-adaptive constant tension winch control system, which comprises a PLC (Programmable Logic Controller), a hydraulic motor, a hydraulic winch, a winch steel wire rope, a fixed pulley, a working boat, a rotary encoder, a shaft pin type sensor and a constant tension loop consisting of three loops, and is characterized in that the first loop comprises a preset oil tank, a main control valve and the hydraulic motor; the second loop comprises a preset oil tank, a main control valve, a shuttle valve, a pressure reducing valve, a hydraulic control reversing valve and a hydraulic brake; the third loop comprises a shuttle valve, an electromagnetic switch valve, a hydraulic control switch valve, an electric proportional overflow valve and a hydraulic motor, the system controls the electromagnetic switch valve and the electric proportional overflow valve at the same time through the PLC according to detection data of the rotary encoder and the shaft pin type sensor, accurate control over the tension of the winch steel wire rope is achieved, and when waves rise, the winch steel wire rope is driven to rotate. The system controls the hydraulic winch to actively lift; and when the waves descend, the system controls the hydraulic winch to descend passively, so that the tension of the winch wire rope is always kept within a preset range, and stable operation of the working boat is ensured.

The application provides a hydraulic control system for impact rotary drilling of a bedding machine, and belongs to the technical field of hydraulic control systems, and comprises a variable pump, a pilot oil source control valve group, a proportional multi-way valve, a shuttle valve I, a one-way pressure reducing valve, a shuttle valve II, a drilling machine pilot handle group, an impact rotary drilling machine, a bidirectional hydraulic lock and a drilling machine feeding oil cylinder. Through the hydraulic control system for impact rotary drilling of the bedding machine, the impact rotary drilling machine can be infinitely adjusted between double speeds, high-frequency impact or low-frequency impact operation can be flexibly used according to rock strata and geological conditions, the use range of the equipment is greatly improved, and the hydraulic control system can be used for high-hardness rock strata, weathered rock strata and hard and brittle geology. When low-frequency impact operation is performed, one-key linkage operation can be realized, that is, the drilling machine feeding, rotation and impact functions can be completed by operating the impact pilot handle.

The invention belongs to the technical field of monorail crane oil temperature control, and particularly relates to a distributed oil temperature control system and method suitable for a monorail crane. An oil suction port of the variable hydraulic pump is connected with a hydraulic oil tank; an inlet of the high-pressure filter is connected with an oil outlet of the variable hydraulic pump; the heat dissipation part is connected to an outlet oil way of the high-pressure filter in series; the pilot control oil way comprises a pilot overflow valve group, a temperature control valve group and a shuttle valve; a P port of the pilot overflow valve group is connected with an oil outlet of the high-pressure filter, and an A port of the pilot overflow valve group is connected with an outlet of the heat dissipation part; a port P of the temperature control valve group is connected with a control oil outlet of the pilot overflow valve group, and a port T of the temperature control valve group is connected with a hydraulic oil tank and used for sensing system oil temperature; a port A of the shuttle valve is connected with an outlet of the temperature control valve set, and a port R of the shuttle valve is connected with a port X of the volume adjustable hydraulic pump. The temperature control valve set is arranged to adjust pilot control oil pressure according to oil temperature changes, the displacement of the volume adjustable hydraulic pump is controlled through the shuttle valve, and self-adaptive control over the rotating speed of the cooling fan is achieved.

The invention relates to the technical field of hydraulic systems, in particular to a dual-mode flow distribution control valve and a load-sensitive system.The dual-mode flow distribution control valve comprises an LS pressure relief control valve, a first shuttle valve, a second shuttle valve, a load-sensitive valve, a small-flow flush valve, a fixed differential pressure reducing valve and a switching valve; a lower end signal input port of the first shuttle valve is connected with an inlet of the small-flow flush valve and an outlet oil way of the fixed differential pressure reducing valve, a right end signal output port is connected with a signal port K3 oil way, and a left end signal output port is selectively connected with a load sensitive valve spring control end oil way or a lower end signal input port oil way of the third shuttle valve. By introducing the dual-mode flow distribution control valve, the system can switch working modes according to different working conditions, so that flow distribution is optimized, unnecessary energy loss is reduced, the flow distribution is automatically adjusted according to different loads and driving working conditions of wheels, and the flow distribution efficiency is improved. And the problems of power parasitism, wheel slipping and the like of a traditional load-sensitive system under different working conditions are avoided.

The utility model relates to the technical field of hydraulic compressors, in particular to a hydraulic system of a hydraulic compressor. Comprising an oil tank, an oil outlet of the oil tank is connected with an oil inlet of a variable displacement piston pump through a low-pressure oil pipeline, one branch of the oil outlet of the variable displacement piston pump is connected with an energy accumulator through a high-pressure oil pipeline and a one-way valve, and the other branch of the oil outlet of the variable displacement piston pump is connected with an oil inlet of an electromagnetic reversing valve. An oil outlet of the electromagnetic directional valve is connected with the hydraulic drive compressor through oil inlet and outlet pipelines, the electromagnetic directional valve is further connected with an oil return opening of the oil tank through an oil return pipeline, and a shuttle valve is arranged between the two oil inlet and outlet pipelines and connected with the variable displacement piston pump through a variable displacement oil pipeline. Pressure oil in the oil inlet and outlet pipeline can enter the shuttle valve and then enter the variable displacement piston pump through the variable displacement oil pipeline, a terminal pressure oil signal is provided for the variable displacement piston pump, the variable displacement piston pump can conduct power adjustment according to the pressure change of the terminal pressure oil, the pressure of the terminal pressure oil is kept stable, and therefore stable work of the hydraulic drive compressor is guaranteed.

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

The utility model relates to the technical field of mounting tools, and discloses a mounting tool for conveniently mounting a slide valve core spring and an elastic check ring of a shuttle valve, which comprises a slide valve core, and a check ring groove is arranged at the top end of the outer surface of the slide valve core. By arranging the guide column, the push sleeve, the check ring groove and the elastic check ring, when an operator presses the push sleeve downwards, the push sleeve pushes the first gasket and the elastic check ring in sequence, the first gasket moves downwards along the outer surface of the sliding valve element and compresses the spring, and then the elastic check ring moves downwards along the outer surface of the guide column. Due to the fact that the guide column is designed to be conical, the elastic check ring is gradually opened in the movement process, due to the fact that the elastic check ring is made of carbon steel, the elastic check ring has good elasticity, when the elastic check ring moves to the position of the check ring groove, the elastic check ring instantly shrinks into the check ring groove, and at the moment, the elastic check ring blocks the overall movement of the first gasket. Therefore, the function of quickly assembling the elastic check ring to the sliding valve element is achieved.

A cylinder body assembly comprises a cylinder body, the front side of the cylinder body is connected with a front pump cover, the rear side of the cylinder body is connected with a rear pump cover, and swash plates are arranged in the front pump cover and the rear pump cover; the transmission shaft penetrates through the front pump cover, the swash plate in the front pump cover, the cylinder body and the swash plate in the rear pump cover to be movably connected to the rear pump cover, and the swash plate is fixed to the transmission shaft. An oil discharge shuttle valve mounting hole and plunger holes in the two sides are formed in the cylinder body, the two plunger holes are communicated through the oil discharge shuttle valve mounting hole, an oil discharge shuttle valve is arranged in the oil discharge shuttle valve mounting hole, an oil discharge outlet is formed in the middle of the outer wall of the cylinder body and communicated with the oil discharge shuttle valve, plunger assemblies are arranged in the plunger holes, and the plunger assemblies are connected with the oil discharge shuttle valve. When the output flow of the plunger pump is not changed, the [PV] value of a friction pair can be reduced, and the rotating speed of the plunger pump is increased; and meanwhile, the probability of fatigue fracture in the high-frequency reciprocating stretching and retracting process of the plunger pump spring can be reduced, and the reliability is high.

The invention provides a redundant oil supply control valve bank, a redundant oil supply system and an underwater control module, the redundant oil supply control valve bank comprises a shuttle valve and two electro-hydraulic composite control valves, the two electro-hydraulic composite control valves are arranged at two oil inlets of the shuttle valve respectively, the two electro-hydraulic composite control valves can be conducted at the same time through a control system, and therefore the redundant oil supply control valve bank can be used for controlling the underwater control module. A hydraulic oil supply system is communicated with two oil inlets of the shuttle valve at the same time, and at the moment, hydraulic oil of one path with large pressure can be passively selected to supply oil through the shuttle valve by means of pressure difference. In addition, the control system can selectively conduct one electro-hydraulic composite control valve and close the other electro-hydraulic composite control valve, and therefore one path of hydraulic oil can be manually assigned to be supplied. According to the redundant oil supply control valve set, the problems that in the related technology, oil supply paths are passively selected only depending on the hydraulic pressure difference, long-term overload loss of one path is caused, long-term idle aging of the other path is caused, and the reliability of system redundancy design is weakened are solved.

A kind of composite brake system, including pump source, first electromagnetic valve, parking brake, brake foot valve group, second electromagnetic valve, wheel brake, shuttle valve and control switch;Pump source forms first liquid filling oil path between first electromagnetic valve and parking brake, pump source forms second liquid filling oil path between brake foot valve group and wheel brake, and third liquid filling oil path is connected between the oil input end and the oil output end of brake foot valve group, and third liquid filling oil path is also connected with a second electromagnetic valve;Second liquid filling oil path is located at the oil output end of brake foot valve group and the input end of third liquid filling oil path that flows into wheel brake forms an oil path intersection, a shuttle valve is arranged in the oil path intersection, and the oil pressure of third liquid filling oil path is greater than the oil pressure of second liquid filling oil path at the oil output end of brake foot valve group;Control switch is used to control the break-on of first electromagnetic valve and the break-off of second electromagnetic valve, so that parking brake and the oil pressure applied from third liquid filling oil path are synchronized to realize wheel brake.

The low-temperature environment hydraulic oil temperature control system comprises a pump group, a winch reversing valve group, an oil tank, a main pump group, a temperature control pump group, a two-motor and displacement adjusting oil cylinder; the oil outlet of the oil tank is communicated with the oil inlet of the main pump group, the oil outlet of the main pump group is communicated with the oil inlet of the oil tank, the oil outlet of the main pump group is communicated with the oil inlet of a filter, the oil outlet of the filter is communicated with the oil inlet of a one-way valve, the oil outlet of the one-way valve is communicated with the P port of the pump group, and the P port of the pump group is communicated with the P port of the winch reversing valve group; the winch reversing valve group comprises a pressure reducing valve, two overflow valves, a proportional reversing valve and a shuttle valve, and the oil outlet of the main pump group is communicated with the oil inlet of the pressure reducing valve. In the working phase of the actuator, the hydraulic oil temperature can be dynamically adjusted through the proportional overflow valve, the hydraulic oil is guaranteed to work at the optimal temperature, the temperature of the oil tank is accurately controlled, and the working efficiency is improved.

The application relates to the technical field of loader brake valves, and discloses a hydraulic brake valve and a hydraulic system thereof, which comprises a hydraulic brake valve, wherein the hydraulic brake valve is composed of a check valve, a brake valve group, a brake lamp pressure switch, a low-pressure alarm pressure switch, a shuttle valve, a high-low pressure unloading valve and a throttle hole, the high-low pressure unloading valve and the throttle hole are integrated, and the hydraulic brake valve is externally provided with a P port, an A port, a B port, a T port, an LS1 port, an LS port, a low-pressure alarm pressure switch and a brake lamp pressure switch. By canceling a liquid filling valve, the oil source of a full-hydraulic power brake system is taken from a priority valve CF port of an existing device, a shuttle valve on the hydraulic brake valve is used for selecting a pressure feedback signal, the pressure feedback signal is transmitted to the priority valve, the full-hydraulic power brake system is filled with liquid and energy is supplemented, or the steering system is used for steering, and the hydraulic brake valve has the advantages of fast brake response, small noise, low failure rate, high safety coefficient, compact structure, low cost, low energy consumption and the like.

The utility model discloses a kind of electrical double control brake systems of remote control loader, it belongs to engineering machinery technical field.It solves the defect that human driving control cannot adapt to narrow space operation, operation under dangerous environment in the conventional loader braking of prior art.Its main structure includes air source assembly, air source assembly is connected with parking component and control component respectively, control component is also connected with the execution component for controlling vehicle brake, control component includes gas brake valve, relay valve, proportional solenoid valve and shuttle valve, the air outlet of air source assembly is connected with gas brake valve, relay valve and proportional solenoid valve respectively, gas brake valve is connected in parallel with relay valve, and the two air inlets of shuttle valve are connected with gas brake valve and relay valve respectively, the signal end of relay valve is also connected with proportional solenoid valve.The utility model is mainly used on loader and other engineering machinery.

This application relates to a redundant hydraulic braking system and control method for vehicles. The integrated parking and service brakes are located at the wheel ends and have parking brake chambers and service brake chambers. The hydraulic oil supply unit includes an oil tank, a motor pump, and an accumulator. The parking brake unit includes a handbrake solenoid valve, and the service brake unit includes a brake pedal, an angular displacement sensor, a pedal valve, an electro-hydraulic proportional valve, and a shuttle valve. The angular displacement sensor is used to collect the brake pedal travel signal. The controller is electrically connected to the angular displacement sensor and each electro-hydraulic proportional valve, and is used to control the output pressure of the electro-hydraulic proportional valve based on the brake pedal travel signal or an external braking signal. The mechanical pedal circuit and the electronically controlled proportional valve circuit are completely independent; even if one circuit fails, normal braking can still be performed, meeting the stringent safety requirements of special vehicles. The short-stroke braking system uses pure electronic control, eliminating the initial free travel of the mechanical pedal, eliminating mechanical dead zones, and is compatible with both manned and unmanned modes. One system simultaneously supports driver pedal operation and remote drive-by-wire commands.