545 results about "Directional Valve" patented technology

The invention discloses an unmanned mine car front and rear wheel synchronous steering system which comprises a car frame, a front steering axle and a rear steering axle, and the front steering axle and the rear steering axle are installed on a car and control steering through a steering system. The steering system comprises a front axle working cylinder, a front axle driven cylinder, a rear axle working cylinder and a rear axle driven cylinder, the front axle working cylinder and the front axle driven cylinder control front wheels of a vehicle to rotate, the rear axle working cylinder and the rear axle driven cylinder control rear wheels of the vehicle to rotate, and cavities of the front axle working cylinder and the rear axle working cylinder are communicated with a working port A and a working port B of a three-position four-way reversing valve through pipelines respectively. Cavities of the front axle driven cylinder and the rear axle driven cylinder are communicated through a valveless rigid connecting pipeline to form a rigid series oil way, and in the rigid series oil way, the amount of oil discharged by the front wheel working cylinder and the front axle driven cylinder is equal to the amount of oil received by the rear wheel working cylinder and the rear axle driven cylinder. Mechanical hydraulic synchronization of steering angles of front and rear wheels of the vehicle is realized, delay and fault risks of dependence on sensors are eliminated, and high-reliability rigid synchronization is realized.

The invention relates to the technical field of valves, and discloses a two-position four-way reversing valve which comprises a double-spliced valve body and a hydraulic pushing device. Two hydraulic cavities which are communicated with each other are formed in the double-spliced valve body, a valve element is arranged in each hydraulic cavity, and a through hole which extends axially is formed in each valve element; a liquid inlet, a liquid return opening and a liquid outlet which are communicated with the hydraulic cavity are formed in the double-spliced valve body; the valve element is sleeved with a valve sleeve, a first flow channel is formed in the position, opposite to the liquid inlet, of the valve sleeve, and a second flow channel is formed in the position, opposite to the liquid return opening, of the valve sleeve. By arranging the valve sleeve outside the valve element, inlet and outlet liquid can flow through the first flow channel or the second flow channel firstly, so that the effective flow area of high-pressure liquid entering the cavity of the double-spliced valve body from the liquid inlet is remarkably increased, and the flow of the inlet and outlet liquid is remarkably increased; and the reliability and the response speed of position switching of the valve element in the valve cavity are ensured.

The application provides a two-position five-way pneumatic reversing valve, and relates to the technical field of hydraulic control valves.The valve body is provided with a first air outlet hole, an air hole and a second air outlet hole from left to right on the lower side, and the inner cavity of the valve body is provided with a valve core.The left end of the valve body is provided with a front baffle, and the right side of the valve body is provided with a piston assembly, which is in contact with the right end surface of the valve core.The valve body is provided with a first annular protrusion, a second annular protrusion, a third annular protrusion, a fourth annular protrusion and a fifth annular protrusion corresponding to each hole.The outer side of the air hole is provided with a plug A, and the air hole is connected with the piston assembly through a pipeline arranged in the valve body.The pipeline is internally provided with a plug B.The electromagnetic structure of the application is integrated, and the parts have better coaxiality during production and assembly, effectively ensuring the service life of the product and the extremely low product failure rate.Compared with the existing split structure, the application has higher electromagnetic conversion efficiency and can effectively reduce the power consumption of the product.

The utility model discloses a control device capable of adjusting hanging height through flow. The control device comprises a posture controller, a hanging control box, a flow meter, a stop valve and a hanging executing mechanism. The suspension actuating mechanism comprises a pneumoelectric valve, an electromagnetic directional valve, a power cylinder and a pressure accumulator, the high-pressure air source is connected with the power cylinder through the pneumoelectric valve, the hydraulic source is connected with the power cylinder after sequentially passing through the electromagnetic directional valve, the stop valve, the flowmeter and the pressure accumulator, and the posture controller is electrically connected with the pneumoelectric valve, the electromagnetic directional valve and the suspension control box. The suspension control box is electrically connected with the stop valve and the flow valve. The suspension device of the special vehicle solves the problem that a driver is inconvenient to operate when the vehicle normally lands ashore or lands a naval vessel due to the fact that the suspension device of the existing special vehicle cannot feed back position information during adjustment, and the use safety is improved; meanwhile, preset height adjustment of the vehicle suspension device is achieved, then preset adjustment of the distance between the vehicle bottom and the ground is achieved, and the operation difficulty of a driver is lowered.

The invention provides a coal mill oil way plate and a reversing control device thereof, and relates to the technical field of coal mill oil way plates, the coal mill oil way plate comprises a valve block body, a proportional overflow valve, a duplex electromagnetic reversing valve group, a working oil way group, two hydraulic control one-way valve groups, two energy accumulators, a safety overflow valve, an online particle counter and a spiral cooling flow channel. The redundancy design of the duplex electromagnetic directional valve group improves the reliability of the system, so that the system can still be operated when a single valve fails, the hydraulic control one-way valve group realizes mechanical locking of an oil cylinder and can prevent a grinding roller from falling off during power failure, and the energy accumulator is connected with a working oil duct through a connector to absorb pressure impact and compensate leakage, so that the stability of loading pressure is maintained, and the reliability of the system is improved. The on-line particle counter gives an early warning of oil pollution in real time, hydraulic faults can be reduced, the spiral cooling flow channel is matched with the semiconductor temperature control piece to adjust the oil temperature, and the problem of pressure drift caused by oil viscosity fluctuation under high and low temperature working conditions is solved.

The utility model relates to the technical field of electro-hydraulic directional control valves, in particular to an electro-hydraulic directional control valve sealing structure which comprises an electro-hydraulic directional control valve body, a hydraulic control directional control valve and an oil cylinder, coils are arranged at the two ends of the inner side of the electro-hydraulic directional control valve body, and the hydraulic control directional control valve is arranged on the surface of the bottom end of the electro-hydraulic directional control valve body. Iron nuts are arranged on the surfaces of the two ends of the hydraulic control reversing valve, an L cavity and an R cavity are formed in the two ends of the inner side of the hydraulic control reversing valve respectively, a reset spring and a sealing ring are arranged on the inner side of the L cavity and the inner side of the R cavity respectively, a connector assembly is arranged on the surface of the bottom end of the hydraulic control reversing valve, and an oil cylinder is arranged at the bottom end of the hydraulic control reversing valve. An iron nut locking mode is used for replacing an original mode that a cover plate is locked through four screws, the overall use efficiency is effectively improved, and the problems that deformation gaps are generated due to the fact that existing locking force is smaller than internal pressure, and internal hydraulic oil leaks to the outside due to long-time work can be solved.

Disclosed is a loop switching valve, comprising a valve body and a valve core arranged in the valve body, wherein the valve core comprises a valve core oil drainage channel arranged in the valve core, and the valve body comprises an oil drainage port (L), a valve body oil drainage channel arranged in the valve body, and a plurality of oil inlets and working oil ports; and the oil inlet is in communication with the corresponding working oil port in a working state, the working oil port in a non-working state is in communication with the oil drainage port (L) by means of the valve core oil drainage channel and the valve body oil drainage channel, so as to discharge hydraulic oil from the working oil port in the non-working state, thereby preventing misoperation. The problems in the prior art of leakage, oil cross-flow and pressure building of a multi-way directional control valve during loop switching are solved, so that the reliability of the system is greatly improved, and the requirements for daily inspection and maintenance of apparatuses by an apparatus management user are also reduced. Further disclosed are a crawler crane chassis hydraulic system using the loop switching and a crawler crane.

The dish-washing machine shunt valve comprises a cover body, a shell, a rotary driver, a valve plate, a spring, a rotating piece and a rotary driver, the cover body and the shell are mutually covered to form a valve cavity, the rotating piece is rotationally connected to the shell and driven by the rotary driver to rotate, and the rotating piece comprises a linkage end. The linkage end is located in the valve cavity and faces the cover body, the valve plate is installed at the linkage end, and the valve plate is axially connected to the linkage end in a sliding mode; the cover body is provided with a first water outlet and a second water outlet, the valve plate is provided with a plurality of control positions, and the plurality of control positions comprise a closed position; the valve plate has three states in the axial rotation process, in the first state, the first water outlet can be blocked at the closed position; in the second state, the sealing position can block the second water outlet; and in the third state, the closed position is staggered with the first water outlet and the second water outlet. The dish-washing machine is simple in structure, capable of achieving dish-washing machine water path control, good in sealing performance of the shunt valve and small in water pressure loss.

The utility model discloses a continuous load gas circuit control system for roadbed detection, which relates to the technical field of roadbed detection and comprises a dynamic load subsystem and a static load subsystem. The dynamic load subsystem comprises a first electromagnetic directional valve, a dynamic load generating cylinder and a throttling speed regulating valve; the static load subsystem comprises an air supply solenoid valve, a second solenoid directional valve, an exhaust speed regulating valve, an exhaust solenoid valve, a static load generation cylinder and an air supply speed regulating valve; according to the utility model, the air cylinder can respectively generate a continuous circulating dynamic load and a stable and uniformly distributed static load on a roadbed by utilizing air path control.

This invention provides a hydraulic control system for a concrete placing boom, comprising a hydraulic oil tank, an oil supply pump unit, a main hydraulic pressure pipeline, a main return hydraulic pipeline, and at least one hydraulic actuator unit. The oil supply pump unit is located on the main hydraulic pressure pipeline. Each hydraulic actuator unit includes a hydraulic cylinder and a control valve assembly. The control valve assembly is located close to the hydraulic cylinder, or integrated onto the hydraulic cylinder. The control valve assembly includes a main directional valve, a standby directional valve, and a balance valve assembly. The inlet ports of the main directional valve and the standby directional valve are respectively connected to the main hydraulic pressure pipeline. The return ports of the main directional valve and the standby directional valve are respectively connected to the main return hydraulic pipeline. The outlet ports of the main directional valve and the standby directional valve are respectively connected to the hydraulic cylinder via the balance valve assembly. This invention also provides a control method for the hydraulic control system of the concrete placing boom and a concrete placing boom device.

This invention relates to the field of directional valve technology, specifically a miniature explosion-proof pneumatic directional valve with a redundant anti-jamming structure. It includes a housing with an internal air passage, a valve stem slidably disposed within the housing, a pneumatic piston connected to one end of the valve stem for driving the valve stem to reciprocate, a valve core slidably mounted on the valve stem and located within the air passage, and an anti-jamming component connected between the valve stem and the valve core. This component includes a positioning disc fixedly connected to the surface of the valve stem and an energy storage spring sleeved outside the valve stem, with both ends of the energy storage spring abutting against the positioning disc and the valve stem, respectively. When the valve core jams within the air passage, the valve stem can overcome the resistance of the anti-jamming component and continue moving relative to the valve core, allowing the anti-jamming component to store energy. When the stored energy reaches a threshold, the anti-jamming component releases the energy to drive the valve core to generate an impact motion.

An automatic shutdown control device and a radiation source system are disclosed. The automatic shutdown control device includes a first actuator (15), a first one-way throttle valve (6), a first pilot-operated one-way throttle valve (11), a first directional valve (110), a fluid pressure source (1), a first return line, a fluid control valve (10), and a first accumulator (13). The first pilot-operated one-way throttle valve (11) includes a second one-way throttle valve (112) and a first one-way valve (111). When power is off, the first directional valve (110) switches to a second operating position (123), the outlet of the fluid pressure source (1) is connected to the through port of the second one-way throttle valve (112) through the first directional valve (110), and the through port of the first one-way throttle valve (6) is connected to the inlet of the first return line through the first directional valve (110). When the fluid pressure source (1) is outputting, the fluid control valve (10) switches to the closed position (101); when the fluid pressure source (1) is disconnected, the fluid control valve (10) switches to the open position (102), and the outlet of the first accumulator (13) is connected to the closed port (B2) of the first actuator (15) through the fluid control valve (10). This device can automatically complete the shutdown action in the state of power failure and / or flow interruption, without the need for manual shutdown, reducing the risks associated with manual operation.

The invention discloses a hydraulic control system for mining rail transportation equipment. The hydraulic control system comprises a walking system and an auxiliary system. The walking system adopts a double-closed variable pump independent parallel design, and the start, stop and flow direction of a pump set are controlled through an electromagnetic directional valve, so that the dual systems are mutually standby, and the core function is ensured not to be interrupted; the auxiliary system adopts a double-auxiliary-pump confluence design, a pressure stabilizing loop is constructed through a one-way valve and a pilot overflow valve, and reliable operation of auxiliary functions such as braking and clamping is guaranteed. The system can dynamically switch a single / double-pump operation mode, the single pump saves energy during light load, and the double pumps converge to increase torque during heavy load; the proportional pressure regulating valve and the constant-power valve are cooperatively controlled, overpower operation of the prime motor is prevented, and energy consumption and abrasion are reduced. And a prime motor adopts an anti-explosion design, an electromagnetic directional valve is automatically switched, a modular structure is convenient to maintain, and the continuity, the safety and the intelligent level of equipment under complex working conditions of a mine are remarkably improved.

This application relates to the field of hydraulic technology for injection molding machines, and provides a high-speed, precision mold-opening control circuit board. In use, the hydraulic fluid enters the P port of the first directional valve from the main return port. Adjusting the valve core position directs the fluid to the A / B ports of the first directional valve, entering the rodless / rod-side connection port, thus supplying oil to the rodless / rod-side chambers of the mold-locking cylinder. Simultaneously, oil from the rod / rodless chambers of the mold-locking cylinder discharges to the rod / rodless interface, allowing the fluid to flow to the T port of the first directional valve. Because a differential circuit is provided, activating the differential circuit connects the passage between the A port of the first directional valve and the rodless / rodless connection port with the passage between the T port of the first directional valve and the main return port. This allows the fluid entering the rodless / rodless chamber of the mold-locking cylinder simultaneously with the fluid entering the rodless / rodless chamber, creating a confluence effect that enables the mold-locking cylinder to move at a faster speed, improving production efficiency.

The invention discloses a loader and a double-pump two-way interchange energy recovery system of a movable arm oil cylinder of the loader, and relates to the technical field of hydraulic drive of loaders. The system comprises a two-position four-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a hydraulic energy accumulator, a third two-position two-way electromagnetic directional valve connected to the hydraulic energy accumulator, a first pump motor, a second pump motor, a first motor and a second motor, wherein oil inlets of the first pump motor and the second pump motor are connected to a hydraulic oil tank, and the first motor and the second motor are in transmission connection with the first pump motor and the second pump motor respectively. The hydraulic oil cylinder is provided with a rodless cavity and a rod cavity, and the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are connected to the rod cavity and the rodless cavity respectively; and the two-position four-way electromagnetic directional valve is used for communicating oil outlets of the first pump motor and the second pump motor with the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve respectively. And the three-position four-way electromagnetic directional valve is used for switching and communicating the third two-position two-way electromagnetic directional valve with the rodless cavity, the rod cavity and an oil inlet of the first pump motor.

A hydraulic system for a sand making machine and its start-up adjustment method are disclosed, relating to the technical field of sand making machine equipment. The hydraulic system includes an oil tank, a hydraulic pump, a hydraulic control valve group, an accumulator valve platform, and a hydraulic cylinder. The hydraulic control valve group includes a solenoid directional valve for controlling the extension or retraction of the piston rod of the hydraulic cylinder, and a hydraulically controlled check valve for maintaining pressure after the rod chamber of the hydraulic cylinder is filled. The accumulator valve platform includes a rodless chamber circuit, a rod chamber circuit, and an accumulator, which is located on the rod chamber circuit and is used for pressure maintenance and overpressure protection. The start-up adjustment method includes: 1. Pressurizing the rod chamber of the hydraulic cylinder and the accumulator; 2. The accumulator is used for pressure maintenance and overpressure protection; 3. Pressurizing when the pressure drops during sand making machine operation and depressurizing when the pressure is too high; 4. Depressurizing before stopping the machine; 5. Retracting the moving roller during maintenance. This invention can solve the technical problems of existing sand making machines, such as large vibration, frequent start-stop, short lifespan, lack of standardization, and easy oil contamination.

This utility model relates to the field of recycling devices, specifically a multi-media filter forward wash drainage recycling device. It includes a drain pipe, a cleaning mechanism, dust collection components, and a three-way pipe. The drain pipe is connected to a directional valve, which in turn connects to two connecting pipes. The cleaning mechanism includes a cleaning component connected to each of the two connecting pipes, and a cleaning half-cylinder b hinged to each of the two cleaning components. A drive component is driven to the two cleaning components. A dust collection component is placed on each of the two cleaning components, and each dust collection component includes a mounting post connected to the cleaning component, a mesh holder arranged circumferentially on the mounting post, and a rectangular block arranged on the mounting post. The three-way pipe connects to the two cleaning components. This utility model drives the two dust collection components separately through the drive component, and the dust collection components capture the dirt inside the cleaning components and the cleaning half-cylinder b, thereby reducing the dirt content inside the liquid.

The invention discloses a rope saw hydraulic system controlled by a proportional valve, and belongs to the technical field of rope saw hydraulic control. Comprising an oil tank, a first filter part, a first motor, a first hydraulic pump, a first one-way valve, a second one-way valve, a temperature sensor, an oil return filter, an air cooler, a first proportional valve, a second proportional valve, a first pressure sensor, a second pressure sensor, a second motor, a second filter part, a second hydraulic pump, a liquid level sensor, an air filter, an electric proportional reversing valve, an electromagnetic ball valve, an energy accumulator and a tensioning oil cylinder. The second motor is in transmission connection with a second hydraulic pump, an oil inlet of the second hydraulic pump is communicated with the oil tank through a second filter part, an oil outlet of the second hydraulic pump is communicated with an oil inlet of a second proportional valve, and an oil outlet of the second proportional valve is communicated with an oil inlet of an electric proportional reversing valve. The rope sawing machine hydraulic system controlled by the proportional valve has the beneficial effect that the sawing rope is prevented from being broken.

The invention relates to methods and devices for blow molding containers. A preform is thermally conditioned and then transformed into the container within a blow mold by the application of blowing pressure. The blowing gas is introduced into the preform in at least two pressure stages via compressed air lines assigned to each pressure stage. A blowing air valve controlling the injection is arranged in each of the compressed air lines. At least the blowing gas of the highest pressure stage is supplied from an external compressed gas source. After container forming, at least a portion of the used blowing air is released to ambient pressure via a relief line controlled by a relief valve.For the purpose of reuse, at least a further portion of the used compressed air is routed via a return line controlled by a return valve to a first compressed gas reservoir, and the stored compressed gas is used for a subsequent forming process. A directional control valve is arranged in the return line between the return valve and the first compressed gas reservoir. This valve has at least two outlets and at least one inlet and connects the return line on its outlet side to the first compressed gas reservoir or to another, second compressed gas reservoir that stores compressed gas at a pressure different from that of the first compressed gas reservoir.

The invention discloses a compact and easily-controlled shallow sea buoy hydraulic system and a working method thereof. The system comprises a telescopic rod, a piston, an inner oil tank, a first one-way valve, a second one-way valve, a gear pump motor set, a normally-closed two-position two-way reversing valve and an outer oil bag. The piston is arranged in the inner oil tank, connected with the telescopic end of the telescopic rod and driven by the telescopic rod to do linear motion in the inner oil tank. The inner oil tank is provided with two oil ports, one oil port is connected to the outer oil bag through a first one-way valve, and the other oil port is connected with an oil outlet of the gear pump motor set through a second one-way valve. An oil inlet of the gear pump motor set is connected with one port of the normally-closed two-position two-way electromagnetic directional valve, and the other port of the normally-closed two-position two-way electromagnetic directional valve is connected with the outer oil bag. The system is compact in structure, only one electromagnetic directional valve and two one-way valves are used in use of the valves, and the number of elements and the size of the system are remarkably reduced.

This invention discloses a hydraulic control system for the injection unit of an injection molding machine, including an oil pump, a first solenoid directional valve, a first cartridge valve, a first throttle, and a hydraulic actuator. The output end of the hydraulic actuator is connected to the piston of the injection cylinder, and the piston of the injection cylinder is connected to a screw via a transmission component. The first solenoid directional valve connects the output end of the oil pump to the hydraulic actuator through the first cartridge valve. The return oil circuit of the hydraulic actuator is connected back to the oil tank of the oil pump. The first throttle is used to control the response of the first cartridge valve so that the pressure oil during melting enters the drive port of the hydraulic actuator through the first cartridge valve. A second cartridge valve and a second throttle are provided at the return oil port of the hydraulic actuator. The return oil of the hydraulic actuator is controlled by the second cartridge valve and the second throttle to drive the rodless chamber of the injection cylinder, achieving a rapid back pressure response, overcoming the friction between the piston and the cylinder of the injection cylinder, ensuring the stability of the melting action, and guaranteeing the quality of the product.

The utility model provides an inclination protection device for elevator operation. The inclination protection device comprises an electromagnetic directional valve and an inclination monitoring component arranged at the bottom of a lifting platform in the middle. The inclination monitoring part is provided with a control module, the control module is connected with an inclination angle sensor and a relay, and the inclination angle sensor is used for monitoring the inclination angles of the lifting platform on the X axis and the Y axis; a normally closed contact of the relay is connected in series in a coil control loop of the electromagnetic directional valve; the electromagnetic directional valve is used for controlling the extension, retraction or stop of the hydraulic cylinder of the elevator; according to the utility model, the inclination angle sensor periodically collects the inclination angles of the lifting platform on the X axis and the Y axis, the control module is provided with an inclination angle threshold value, when the collected inclination angles of the lifting platform on the X axis and the Y axis exceed the inclination angle threshold value, the control module outputs a control signal to the relay, and the normally open contact of the relay is disconnected; a coil of the electromagnetic reversing valve is powered off, the elevator hydraulic cylinder is controlled to stop, the lifting platform is driven to move, and safety risks are reduced.

The utility model provides a hydraulic system suitable for a wind driven generator. The hydraulic system comprises a main shaft brake executing mechanism, a yaw brake executing mechanism, an oil tank assembly, an oil supply motor pump set and a control valve block assembly. The control valve block assembly comprises a valve block body, a first electromagnetic reversing valve, a second electromagnetic reversing valve and a third electromagnetic valve. One end of the second electromagnetic directional valve is connected with the main shaft brake actuating mechanism, and the other end of the second electromagnetic directional valve is connected with a first oil port in one side of the third electromagnetic valve and the oil supply motor pump set; one end of the first electromagnetic directional valve is connected with the main shaft brake actuating mechanism, and the other end of the first electromagnetic directional valve is connected with a second oil port in one side of the third electromagnetic valve and the oil tank assembly; and the other oil port of the third electromagnetic valve is connected with a yaw brake actuating mechanism. According to the utility model, each group of sandwich valve blocks are integrated, so that leakage among the sandwich valve blocks and leakage of connecting oil pipes among the sandwich valve blocks are avoided, the structure is more compact, leakage is not easy to occur, meanwhile, system oil ways of a main shaft brake, a yaw brake and a variable pitch are optimized, and leakage points of the oil ways are reduced.

Hydrostatic directional control valve (1) with a valve housing (6) in which a valve bore (4) is formed in which a valve spool (2) is guided, with which a fluid connection to at least two consumer ports (A, B) can be controlled, characterized in that the valve spool (2) is designed as a sleeve, wherein a fluidic separation between the two consumer ports (A, B) is effected by a separating piece (8) arranged within the valve spool (2) and supported in a fixed position on the valve housing (6).

This invention discloses a control system for improving the safety of pile driver construction, comprising: a hydraulic oil tank, a hydraulic pump, a pressure reducing valve, a three-position four-way directional valve, a one-way hydraulic lock, a two-way hydraulic lock, a clamping cylinder, a pressure sensor, an instrument display, a controller, a self-resetting slide key, and a working device action switch. The controller is electrically connected to the hydraulic pump, the three-position four-way directional valve, the pressure sensor, the instrument display, the self-resetting slide key, and the working device action switch. The hydraulic oil tank is connected to the hydraulic pump, the pressure reducing valve, the three-position four-way directional valve, the one-way hydraulic lock, the two-way hydraulic lock, and the hydraulic cylinder in sequence via hydraulic pipelines. The pressure sensor is used to detect the oil pressure at the outlet of the one-way hydraulic lock. By adding a pressure sensor and sending the clamping pressure to the controller, and by adding judgment logic to the main controller to display the clamping oil circuit status on the instrument, and by adding judgment logic to the pile loosening action in the controller, safety accidents caused by operator error are reduced.

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 invention relates to the technical field of hydraulic systems, and provides a hydraulic system and a rolling device. The first electromagnetic directional valve is provided with a first communication port, a second communication port, a third communication port and a fourth communication port, the first communication port is communicated with the first cavity, the second communication port is communicated with the second cavity, the third communication port is communicated with the oil supply pipeline, and the fourth communication port is communicated with the oil return pipeline; the first electromagnetic reversing valve adjusts the operation states of the multiple hydraulic cylinders by switching the communication states of the first communication opening, the second communication opening, the third communication opening and the fourth communication opening. The pressure reducing valve is arranged on a connecting pipeline of the third communicating port and the oil supply pipeline; an oil inlet of the pressure adjusting assembly is communicated with the remote control oil port of the pressure reducing valve, and an oil outlet of the pressure adjusting assembly is communicated with the oil drainage pipeline. According to the scheme, the output pressure of the working roller can be controlled.

This invention relates to the field of directional valve technology, and more particularly to a food-grade plate-type pneumatic directional valve, comprising a directional valve housing, a first channel at one end of the directional valve housing, two channels and a third channel at the bottom of the directional valve housing, quick-opening hand holes on both sides of the directional valve housing, a pneumatic actuator mounted on the side wall of the directional valve housing, and a baffle plate inside the directional valve housing connected to the pneumatic actuator via a coupling. This invention utilizes a float plate and microswitches. The float plate drives a slider to move within a groove. When the slider moves to contact either the first or second microswitch, a corresponding electrical signal is triggered. When liquid leakage causes an abnormal rise in the water level of a certain channel, the float plate rises accordingly, triggering the second microswitch, which activates an electric push rod to push the push plate, causing the rubber band to expand. The rubber band then opens the rubber sealing gasket, enhancing the sealing effect and reducing the possibility of leakage expansion.

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

This invention discloses a fully automatic drilling multi-way valve system for a hydraulic anchor bolt drilling rig, relating to the field of coal mining technology. It includes: an automatic feed directional valve, a motor rotation directional valve, a water spray directional valve, a first directional valve, a second directional valve, and a detection and switching unit that controls the second directional valve to switch direction when the feed cylinder reaches its endpoint. A pilot control oil circuit connects to the start-side hydraulic control ports of the automatic feed directional valve, the motor rotation directional valve, and the water spray directional valve via the second and first directional valves, respectively. Port B of the second directional valve is connected to the return-side hydraulic control port of the automatic feed directional valve. The rodless chamber oil inlet of the feed cylinder is connected to the hydraulic control port of the first directional valve, and port A of the first directional valve is connected to the return oil circuit. In this invention, automatic drilling, drilling water spraying, and automatic return to a stop state to wait for the next automatic drilling process can be achieved by pushing the push rod of the automatic feed directional valve, reducing labor intensity and improving safety, construction efficiency, and construction quality.