131 results about "Directional Valve" patented technology

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.

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.

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 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.

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.

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.

This invention discloses a hydraulic system for protecting the drive unit of an aerial work platform, relating to the field of engineering machinery technology. It includes: a hydraulic oil tank, a shut-off valve, a hydraulic pump, a filter, a solenoid relief valve, an electro-proportional directional valve, an integrated valve assembly, a hydraulic motor, a drive valve assembly, a steering cylinder, and a protection valve assembly. One end of the hydraulic oil tank is connected to one end of the shut-off valve, the other end of the shut-off valve is connected to one end of the hydraulic pump, the other end of the hydraulic pump is connected to one end of the filter, and the other end of the filter is connected to one end of the solenoid relief valve and the input end of the electro-proportional directional valve. The output end of the electro-proportional directional valve is connected to the input ends of the integrated valve assembly, the drive valve assembly, the steering cylinder, and the protection valve assembly. The output end of the drive valve assembly is connected to multiple hydraulic motors. This invention shortens the hydraulic oil transmission path and reduces pressure loss along the path, reduces energy waste under no-load and light-load conditions, and extends the service life of hydraulic components and mechanical structures.

This utility model discloses a hydraulic circuit for a roll edge heating device, including a cylinder connected to a heating head. The hydraulic circuit of the cylinder is equipped with an electromagnetic directional valve for controlling the forward and backward movement of the cylinder. A pressure reducing valve (P port) and an A port pressure reducing valve (A port) are also installed on the P port of the hydraulic circuit. A pressure sensor A is located near the A port pressure reducing valve, and a pressure sensor B is located near the cylinder itself. A proportional throttle valve is located near pressure sensor A. This structure and method change the design concept, achieving automatic calibration of the zero-position gap between the electromagnetic heating head and the roll from the hydraulic circuit. This makes operation more convenient and provides precise positioning. After calibration, there is no need to contact the roll each time, ensuring safe and reliable use.

The utility model discloses a pilot type hydraulic lock multiway reversing valve group, include: multiway reversing subassembly, the multiway reversing subassembly includes valve body and connecting mouth, limiting component, the limiting component includes fixed link, connecting rod, moving link and limiting frame, the fixed link is fixed in the valve body positive back one side edge department, and the connecting rod is inserted in the opposite side of fixed link outside end, and the moving link sliding connection has the opposite end inside of connecting rod, and the limiting frame is fixed in the opposite end of moving link, the utility model discloses a limiting component is set up, when the outside connecting pipe and connecting mouth are inserted, and the pipe body of connecting pipe and limiting frame are connected, so that limiting frame is connected through moving link and opposite end connecting rod, fixed link, prompting limiting frame through moving link and connecting rod to the pipe body of inside limit, when connecting pipe and connecting mouth are separated, and connecting pipe is hung in limiting frame, so that limiting frame is limited to the connecting pipe of separation, prevents the loss of the connecting pipe of separation.

This invention proposes a multi-parallel neutron cylinder hydraulic circuit for injection molding machines, including a neutron valve plate, an oil tank, neutron cylinder one, and neutron cylinder two. The neutron valve plate is equipped with an inlet pipe, a return pipe, and an unloading pipe. One end of the inlet pipe is an inlet port, and one end of the return pipe is a return port. Operation via the control panel sends a signal to the two-way solenoid directional valve, causing it to open. At this time, the hydraulic oil in the left and right chambers of neutron cylinder one and neutron cylinder two flows through parallel check valves A, B, A, and B, and is depressurized back to the oil tank via the T port of the two-way solenoid directional valve. If there are more cylinders, they can be connected in parallel and stacked according to the number of cylinders. Only one two-way solenoid directional valve is needed to achieve the simultaneous unloading effect of multiple neutron cylinders, effectively improving the depressurization efficiency of the neutron cylinders and reducing operating costs.

The utility model discloses a hydraulic valve, the utility model discloses a hydraulic valve including valve body, along the axial direction of valve body, and valve body is provided with the valve body cavity and valve body hole that communicate with each other, is provided with static armature and valve core in the valve body cavity, and static armature is provided with static armature cavity, and reset spring in the compressed state is provided with in static armature cavity, and reset spring is in abutment with valve core, and valve core is used for plugging or opening valve body hole, the outer peripheral surface of valve body is still provided with the electromagnetic coil of setting, still be provided with valve body liquid inlet hole on valve body, and valve body liquid inlet hole communicates with valve body cavity, and the valve core liquid inlet hole that is provided with is on valve core, and valve core still is provided with valve core cavity, and valve core liquid inlet hole communicates with valve core cavity, and there is clearance between valve body and valve core, and valve body liquid inlet hole, clearance, valve core liquid inlet hole, valve core cavity and static armature cavity communicate. The utility model discloses a hydraulic valve good sealing, effectively guarantee the reliability of hydraulic valve when working.

This invention relates to the field of slewing drive technology, and discloses a sliding system, adjustment method, and engineering machinery. The sliding system of this invention is applied to the slewing mechanism of engineering machinery, including a hydraulic oil tank, a hydraulic motor, a first pipeline, a second pipeline, and a slewing control module. The hydraulic motor is connected to the hydraulic oil tank, and the two pipelines are respectively connected to its inlet and outlet ends. The slewing control module includes a slewing directional valve, a free-slide proportional valve, and two slewing balance valves. The slewing directional valve can switch between blocking and conducting positions. The slewing balance valve has a load feedback valve core. The free-slide proportional valve is connected in parallel to two pipelines and is connected to a bypass oil circuit and the main machine tilt sensor. Its opening degree is controlled by its current signal. The sliding system of this invention can achieve stepless speed regulation of slewing, reduce hydraulic shock, and prevent slippage by maintaining pressure through the slewing balance valve. Compared with mechanical speed regulation, it is smoother and can achieve independent control of forward and reverse rotation, improving operational safety and stability.

This invention discloses a low-pressure-loss, lightweight integrated control unit for injection molding machine mold clamping, comprising an integrated unit body and a hydraulically controlled directional valve and first to third cartridge valves integrated within it. First to fourth solenoid valves are superimposed on the outside of the unit body. The unit body has P-ports, T-ports, and multiple external working ports, which are connected to actuators such as the mold adjusting motor and the mold clamping cylinder. Each port is interconnected with the cartridge valve ports and solenoid valve mounting surfaces through internal process holes, forming a compact oil circuit. This invention, through high valve body integration and optimized oil circuit design, significantly shortens the flow path, reduces pressure loss and energy consumption, and improves system response speed and sealing reliability. The integrated unit body, cast in one piece, is compact, lightweight, easy to process and assemble, reduces the number of parts and maintenance costs, and is suitable for efficient control of injection molding machine mold clamping systems.

This utility model provides a locking tag device for a manual directional valve, relating to the field of manual directional valve technology. It includes a directional valve body and a support plate fixedly mounted on the directional valve body. Three operating levers are rotatably connected to the directional valve body. Through holes are provided on the support plate, and a handle passes through these holes and connects to a sliding plate. The handle is used to move the sliding plate so that the stop holes on the support plate and the sliding plate coincide or separate. This utility model has a reasonable and simple structure, and is quick and accurate to operate. When operating the manual directional valve, moving the handle moves the sliding plate so that the sliding plate and the stop holes on the support plate are misaligned, thereby locking the operating levers. Therefore, this locking tag device improves upon the original operating handle device, effectively eliminating safety hazards during operation, avoiding misoperation during use, and improving operational safety.

This utility model discloses a large-diameter integrated electro-hydraulic directional valve with overflow. The large-diameter integrated electro-hydraulic directional valve with overflow includes a valve body. The valve body contains a valve core, an electromagnetic directional valve, and an overflow valve. The valve body has a valve core channel penetrating the valve body. The valve core is slidably connected to the valve core channel. End caps are provided at both ends of the valve core channel. A spring cavity is provided inside the end cap, and a spring is provided in the spring cavity. The end of the valve core is connected to the end cap via the spring. An auxiliary oil passage is provided on the end cap. The valve body has multiple flow channels used as hydraulic oil circuits, and flow channel openings are formed on the outer surface of the valve body. Each flow channel opening includes at least a pressure port (P), a return port (T), a working port (A), and a working port (B). The oil inlet of the overflow valve is connected to the pressure port (P) via the flow channel, and the oil return port of the overflow valve is connected to the return port (T) via the flow channel.

This invention relates to a hydraulic load-sensitive multi-way valve testing system, comprising a driver, a load-sensitive pump assembly, a variable hydraulic resistance, a load-sensitive compensator, and a directional valve connected in series to form a hydraulic output circuit. The driver controls the load-sensitive pump assembly to drive hydraulic oil upwards, which then experiences a pressure drop after passing through the variable hydraulic resistance. Finally, the hydraulic oil is output through the directional valve. The load-sensitive compensator is connected to the directional valve. The load-sensitive pump assembly includes an output pump, a pressure control valve, and a flow control valve. The driver drives the output pump. The rod chamber of the output pump is connected to the pressure control valve and the flow control valve. The output pump is connected to the directional valve, and the variable hydraulic resistance is located between the output pump and the directional valve. The pressure control valve is connected to the flow control valve and is used to limit the maximum working pressure. The inlet of the flow control valve is connected to the inlet of the directional valve. This invention provides a hydraulic load-sensitive multi-way valve testing system with small measurement errors.

This invention relates to a hydraulic control system and method for a harvester drum concave plate gap floating mechanism and a drum assembly. The hydraulic control system for the harvester drum concave plate gap floating mechanism includes a concave plate gap adjusting cylinder, a hydraulic pump, and an accumulator. The cylinder barrel of the concave plate gap adjusting cylinder is hinged to the harvester body, and the piston rod of the concave plate gap adjusting cylinder is hinged to the concave plate. The hydraulic pump is connected to the concave plate gap adjusting cylinder through a cylinder drive pipeline. A two-position three-way solenoid directional valve and a two-position two-way one-way shut-off valve are provided on the cylinder drive pipeline along the hydraulic oil flow direction. The hydraulic pump is connected to the accumulator through an accumulator pipeline. A first one-way valve and a second one-way valve are provided on the accumulator pipeline along the energy storage direction. A first pressure relief pipeline connecting back to the oil tank is also connected to the accumulator pipeline between the first and second one-way valves. A first relief valve is provided on the first pressure relief pipeline. The concave plate gap adjusting cylinder is connected to the accumulator pipeline between the first pressure relief pipeline and the second one-way valve through a second pressure relief pipeline.

This invention provides an intelligent CNC hydraulic system and control method, including a sensing and monitoring unit comprising a multi-source heterogeneous sensor network deployed at key nodes throughout the system. The invention is rationally designed, using a multi-source heterogeneous sensor network deployed throughout the system to simultaneously collect multi-dimensional operating parameters such as pressure, flow rate, temperature, and vibration. Edge computing is used to complete data preprocessing and fault-sensitive feature extraction. Relying on an SVM-LSTM dual-model fusion fault intelligent diagnosis module and integrating a fault tree FTA analysis submodule, it achieves accurate classification of fault types, rapid location of fault points, and root cause tracing. It also provides early warning of early system faults, significantly improving fault diagnosis accuracy compared to traditional threshold alarm methods. Furthermore, it can identify fault types that traditional methods cannot detect, such as directional valve sticking, predicting fault development trends in advance and effectively preventing equipment damage caused by fault escalation.

This invention discloses an electronically controlled suspension cylinder, an electronically controlled suspension system, and engineering machinery. The electronically controlled suspension system includes two electronically controlled suspension cylinders, a central rotating body, and an accumulator. Each electronically controlled suspension cylinder includes an electromagnetic directional valve and a suspension cylinder. The valve port of the electromagnetic directional valve is connected to the oil port of the suspension cylinder via a pipeline. The electromagnetic coils of the electromagnetic directional valves of the two electronically controlled suspension cylinders are connected and then connected to the central rotating body. The oil ports at the top of the two electronically controlled suspension cylinders are connected, and an accumulator is installed on the connecting line. This invention associates the activation signal of the electronically controlled suspension system with the vehicle's travel signal. Whenever the vehicle is in motion, the electronically controlled suspension system activates. When activated, the two electronically controlled suspension cylinders and the accumulator are interconnected, providing a shock absorption effect. This invention uses the electromagnetic directional valve and the suspension cylinder in conjunction, eliminating the need for a hydraulically controlled check valve assembly. The suspension system activation is reliable, and there is no risk of instantaneous closure.

The present invention relates to a heat pump (1) and a method for controlling the heat pump, the heat pump having a heating mode and a cooling mode and including a refrigerant circuit (200) and a hydraulic circuit (100), the refrigerant circuit including a refrigerant configured to circulate through the refrigerant circuit, a compressor (12), an internal heat exchanger (10), and a directional valve (14), particularly a 4 / 2-way valve, wherein the internal heat exchanger is configured to exchange heat between the refrigerant and a hydraulic fluid configured to circulate through the hydraulic circuit, and the directional valve is configured to reverse the flow direction of the refrigerant in the refrigerant circuit to switch between the heating mode and the cooling mode, the heat pump also including a second directional valve (50) configured to reverse the flow direction of the refrigerant or hydraulic fluid through the internal heat exchanger, such that the refrigerant and the hydraulic fluid flow countercurrently through the internal heat exchanger in the heating mode and the cooling mode.

This hydraulic drive device supplies and drains a working fluid to and from a hydraulic cylinder and includes: a plurality of hydraulic pump motors including suction ports and discharge ports; a plurality of electric motors respectively connected to the plurality of hydraulic pump motors; and a directional control valve that is connected to a meter-out passage and connects the hydraulic cylinder to the meter-out passage to drain the working fluid from the hydraulic cylinder to the meter-out passage. The suction ports of the plurality of hydraulic pump motors are connected in parallel with the meter-out passage.

A rack piston of a hydraulic steering assembly divides a hollow portion of a housing into an upper cylinder above the rack piston and a lower cylinder below the rack piston. The rack piston defines a rack cavity. An auto-bleeder bi-directional flow valve disposed in the rack piston allows for the flow of air and hydraulic fluid in and out of the rack cavity. The bi-directional flow valve defines a flow path through the rack piston between the rack cavity and the upper cylinder. When a differential pressure between the upper cylinder and the lower cylinder is greater than a threshold, the steel ball blocks the flow path by compressing a first spring or a second spring. Alternatively, the first spring and the second spring hold the steel ball in a neutral position to allow for the flow of air and hydraulic fluid in and out of the rack cavity.

This utility model relates to the field of wood chipper technology, specifically to a hydraulically driven feeding wood chipper. The wood chipper body is equipped with a transmission assembly and a hydraulic feeding assembly. The transmission assembly includes a first pulley, a second pulley, and a hydraulic pump assembly. The hydraulic pump assembly includes a hydraulic pump and pulleys. The hydraulic pump's inlet pipe is connected to an oil tank assembly, and the hydraulic pump's output oil circuit is connected to the hydraulic motor's inlet via a solenoid directional valve. When the cutting shaft speed decreases, the feeding speed is reduced to prevent the crushing disc from getting stuck. Simultaneously, a speed detection controller is installed on the wood chipper body to detect the cutting shaft speed. When the cutting shaft speed is lower than a set value, the speed detection controller stops the hydraulic motor and stops feeding, minimizing the risk of the crushing disc getting stuck.

This invention provides a hydraulic outrigger extension and retraction control circuit and method, including an electronically controlled power unit, a tractor power source, a control valve group, and an outrigger actuator. The control valve group includes a first pilot-operated relief valve and several solenoid directional valves. The first pilot-operated relief valve and the several solenoid directional valves are connected in parallel. The first pilot-operated relief valve is used to control the pressure build-up and unloading of the control valve group. The electronically controlled power unit is connected to the outrigger actuator through the control valve group. The tractor power source is connected to the outrigger actuator. In this invention, the electronically controlled power unit is installed on the semi-trailer and uses a DC power supply to drive the extension and retraction of the outrigger actuator. The tractor power source is installed on the tractor. When the outrigger actuator needs to accelerate its extension and retraction, the hydraulic oil transported by the tractor power source and the hydraulic oil driven by the electronically controlled power unit merge and enter the outrigger actuator together, increasing the flow circulation in the outrigger actuator and making its operation safer and more reliable.

The present application relates to a kind of proportional reversing valve control drive circuit, belong to proportional reversing valve control drive technical field, solve the problem that proportional reversing valve control drive circuit is mostly one-way drive. Including: digital-analog conversion circuit, receives digital given control signal and carries out digital-analog conversion, obtains corresponding analog given control signal;The positive and negative of corresponding digital given control signal and analog given control signal are same;Forward analog feedback control circuit, based on the forward analog given control signal received and the forward current sampling signal obtained from the positive connection terminal of proportional reversing valve generates forward deviation control signal, and the forward deviation control signal is carried out pulse width modulation, amplification drive, generates the forward valve drive signal for controlling the positive connection terminal of proportional reversing valve;Reverse analog feedback control circuit, based on reverse analog given control signal generates the reverse valve drive signal for controlling the negative connection terminal of proportional reversing valve.

This utility model provides a hydraulic cylinder acceleration structure that can improve the cylinder's operating speed, increase work efficiency, and reduce energy consumption. It includes a quick-release control valve, a two-position two-way directional valve with a control port, an inlet, and an outlet. The control port is connected to the rod chamber oil circuit (first oil circuit) communicating with the rod chamber of the hydraulic cylinder. The inlet is connected to the rodless chamber oil circuit (second oil circuit) communicating with the rodless chamber of the hydraulic cylinder. The outlet is connected to a low-pressure oil circuit directly or via a fourth oil circuit and a pressure regulating valve. A third oil circuit supplying oil to the rodless chamber is connected to the second oil circuit. The cross-sectional area of ​​the second and fourth oil circuits is larger than that of the third oil circuit, and the flow rate of the second and fourth oil circuits is also larger than that of the third oil circuit. When the pressure in the first oil circuit is high, the quick-release control valve is in the position where the inlet and outlet are connected, the first oil circuit supplies oil to the rod chamber, and the rodless chamber returns oil to the low-pressure oil circuit through the second channel and the fourth oil circuit.