1409 results about "Directional Valve" patented technology

A pump system includes a housing defining a first internal volume and a second internal volume, a first piston positioned to separate the first internal volume into a first chamber and a second chamber, a second piston positioned to separate the second internal volume into a third chamber and a fourth chamber, a first inlet check valve configured to permit fluid flow into the first chamber, a second inlet check valve configured to permit fluid flow into the third chamber, a directional control valve (DCV) repositionable between (a) a first position where the DCV is configured to fluidly couple the second chamber to a high pressure fluid source and (b) a second position where the DCV is configured to fluidly couple the fourth chamber to the high pressure fluid source, and a relief valve configured to supply a fluid to the DCV through an orifice to move the DCV.

The invention provides a pneumatic operated directional valve and an energy-saving hydraulic station with the pneumatic operated directional valve. The pneumatic control valve comprises a pneumatic control valve shell and a pneumatic control valve element. The pneumatic control valve element is arranged in the pneumatic control valve shell in the length direction of the pneumatic control valve shell in a sliding mode. The pneumatic control valve shell is provided with an air inlet P, a first air outlet A, a second air outlet B, an exhaust port R, a pneumatic control loading port Y1 and a pneumatic control unloading port Y2. After the forward sliding side of the pneumatic control valve element is unloaded through the pneumatic control unloading port Y2, the air inlet P injects air into the reverse sliding side of the pneumatic control valve element, and the pneumatic control valve element can slide in the pneumatic control valve shell in the forward direction. The pneumatic control loading port Y1 and the pneumatic control unloading port Y2 are used for loading and unloading the forward sliding side of the pneumatic control valve element correspondingly, the stability and continuity of reverse sliding of the pneumatic control valve element can be achieved through loading, the forward sliding resistance of the pneumatic control valve element can be reduced through unloading, and therefore the pneumatic control valve element is prevented from being clamped and stopped in the reversing process, and the reversing efficiency of the pneumatic control valve element is improved. And the situation that the pneumatic control valve element stops at the middle position is avoided.

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

The invention relates to the technical field of hydraulic control, and provides a pump-controlled semi-active ship heave compensation hydraulic system and a control method thereof.The system comprises an active compensation hydraulic module, a passive compensation hydraulic module, a sensor module, a controller and a motion sensor; the passive compensation hydraulic module comprises a nitrogen cylinder unit, an energy accumulator unit, a gas-liquid converter, a seventh electromagnetic directional valve, a fourth electromagnetic directional valve and a passive compensation asymmetric hydraulic cylinder; the active compensation hydraulic module comprises a third energy accumulator, a servo motor, a two-way quantitative hydraulic pump, a first one-way valve, a second one-way valve, an active compensation asymmetric hydraulic cylinder, a first electromagnetic reversing valve, a second electromagnetic reversing valve and a third electromagnetic reversing valve. According to the invention, passive compensation and active compensation are fused, so that the compensation precision and efficiency are greatly improved; and an electro-hydraulic servo pump control mode is adopted, so that the advantage of high control precision of a valve control mode is reserved, and the stability is also improved.

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

The utility model discloses a walking hydraulic system and a shear fork type lifting working platform. The system comprises a hydraulic oil tank, an oil pump, a first motor, a second motor, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a third electromagnetic reversing valve, a fourth electromagnetic reversing valve, a first balance valve, a second balance valve and a flow distributing and collecting valve. An original two-position four-way electromagnetic directional valve is replaced by the third electromagnetic directional valve and the fourth electromagnetic directional valve, and the flow distributing and collecting valve is additionally arranged, so that the flow of the two motors is evenly distributed during low-speed walking, and the problems that long-distance linear walking cannot be achieved, and slipping and weakness are prone to occurring during low-speed walking are solved; the flow collecting opening of the flow distributing and collecting valve is connected with the second electromagnetic directional valve in parallel, oil ways are switched through the second electromagnetic directional valve without passing through the flow distributing and collecting valve, and the problems of high system pressure and high energy consumption caused by the fact that oil flows through the flow distributing and collecting valve during high-speed walking are solved.

The invention discloses a shackle hydraulic system for an underground drill rig and a control method. The shackle hydraulic system is provided with an oil tank and a main oil pump; the rotary motor oil way and the feeding oil cylinder oil way are communicated with the main oil pump; proportional directional valves for controlling the transmission direction of hydraulic oil are arranged on an oil inlet path and an oil return path of the rotary motor oil path; the oil inlet path and the oil return path are respectively connected between the proportional directional valves and the rotary motor; a high-pressure selection valve is arranged in the oil path; the hydraulic control reversing valves are arranged on an oil inlet way and an oil return way of the oil way of the feeding oil cylinder, and the two-position two-way valves are arranged on the oil inlet way and the oil return way respectively. And the high-pressure selection valve is respectively and hydraulically communicated with the hydraulic control reversing valve and the two-position two-way valve to control the opening and closing of the hydraulic control reversing valve and the two-position two-way valve. The problem that the drill rod is easily damaged due to the fact that the feeding speed and the rotating speed are not matched during screwing on and screwing off of the drill rod is solved through accurate control of the hydraulic system, meanwhile, the automation level of the drilling machine is improved, and the labor intensity of workers is relieved.

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

The invention relates to a hydraulic system for an iron roughneck. The hydraulic system comprises a hydraulic pump station, an electromagnetic directional valve group, a pilot pressure-reducing overflow valve and two upper shackle oil cylinders which are arranged in parallel, an oil supply port and an oil return port of the hydraulic pump station are communicated with corresponding oil ports of the electromagnetic directional valve set in a one-to-one correspondence mode, the electromagnetic directional valve set comprises a first working unit, the first working unit is provided with a first working oil port and a second working oil port, the first working oil port is communicated with rodless cavities of the two upper shackle oil cylinders, and the second working oil port is communicated with rodless cavities of the two lower shackle oil cylinders. Rod cavities of the two upper shackle oil cylinders are communicated with a port B of the pilot pressure reducing overflow valve, a port T of the pilot pressure reducing overflow valve is communicated with an oil tank of the hydraulic pump station, and a port A of the pilot pressure reducing overflow valve is communicated with the second working oil port. According to the iron roughneck hydraulic system, after the screwing pressure reaches the set pressure, low-pressure overflow is carried out through the pilot pressure reduction overflow valve, and therefore it can be guaranteed that a screw thread is screwed, and the screw thread can be prevented from being damaged.

The invention discloses a hydraulic control system and control method for a hard rock heading machine gripper shoe, the hydraulic control system comprises a left gripper shoe oil cylinder and a right gripper shoe oil cylinder which are formed by N gripper shoe oil cylinders, and N is greater than or equal to 2; the system further comprises a first logic valve group and a second logic valve group, the first logic valve group is connected with a first electromagnetic directional valve for controlling on-off of the first logic valve group, and the second logic valve group is connected with a second electromagnetic directional valve for controlling on-off of the second logic valve group. During working, a part of confluence oil sources are respectively communicated with rod cavities of the gripper oil cylinders through the first logic valve group; a part of the confluence oil source communicates with rodless cavities of the gripper oil cylinders through the first logic valve set and the second logic valve set, and the gripper oil cylinders are controlled to conduct differential telescopic motion and independent telescopic motion. According to the hydraulic system, the gripper oil cylinders can differentially and rapidly stretch out, the multiple gripper oil cylinders can be independently controlled to stretch out, the stretching-out time of the gripper is shortened, meanwhile, the gripper oil cylinders at different positions can independently stretch out, and therefore the hydraulic system adapts to surrounding rock conditions of different geologies, and meanwhile by achieving control over the stretching-out and stopping states of the single oil cylinder, the working efficiency is improved. The phenomenon that impact force is generated on the TBM due to the extending stroke difference of the supporting shoe oil cylinder is avoided, potential safety hazards are reduced, and the working efficiency and construction safety of the hard rock tunneling machine are improved.

The invention discloses a multifunctional combined multi-way reversing valve. Relates to the technical field of reversing valves. Comprising a valve body, a first valve element and a second valve element, the first valve element and the second valve element are arranged in the valve body, a valve cavity is formed in the valve body, a feeding pipe and two discharging pipes are arranged on the outer wall of the valve body, a hydraulic cylinder is arranged on the outer side of the valve body, and the first valve element and the second valve element are connected through a connecting assembly. The hydraulic cylinder is used for driving the first valve element to reciprocate in the length direction of the valve cavity. The connecting assembly comprises a polished rod and a lead screw which are movably connected with each other, the polished rod is arranged on the inner side of the first valve element in a penetrating mode, one end of the lead screw is connected with the end of the polished rod, and the other end of the lead screw penetrates through the second valve element. A motor is arranged on the outer side of the valve body and used for driving the lead screw to rotate. The two discharging pipes can be converted into a simultaneous discharging state from an alternate discharging state, so that the discharging device adapts to more complex application scenes.

The invention discloses a safety braking hydraulic system for a main elevator of a ship lift and a control method. The hydraulic system comprises an oil tank, a first motor pump set, a second motor pump set, a first high-pressure filter, a second high-pressure filter, a first one-way valve, a second one-way valve, a pressure gauge, a first pressure sensor, an energy accumulator, a stop valve, an oil return filter, a safety brake module and a working brake module. A safety brake loop is provided with a two-way cartridge valve and an electromagnetic directional valve, quick response and brake loosening and locking synchronization are achieved, a working brake loop is provided with an overflow valve and a proportional overflow valve, the proportional overflow valve, a PLC, a third pressure sensor and a speed encoder form a closed-loop system, the voltage of the proportional overflow valve is accurately adjusted according to oil pressure and speed, and the safety brake loop is controlled. The braking torque is timely controlled, stable braking is guaranteed, potential safety hazards such as poor synchronism and uncontrollable braking of a traditional hydraulic system can be eliminated, and safe operation of the main elevator is guaranteed.

A flexible energy-saving speed limit control system for free anchoring of a large anchor winch includes an anchor winch brake oil cylinder, a one-way throttle valve, a two-position four-way electromagnetic reversing valve, a pressure reducing valve, a clutch oil cylinder, a pressure gauge, a one-way valve, and a main safety valve; the oil outlet of the hydraulic pump is connected to the P port of the main safety valve through a one-way valve on one side, and is connected to the working oil chamber of the anchor winch brake oil cylinder through a pressure reducing valve, an electromagnetic reversing valve, and a one-way throttle valve on the other side; the oil suction port is connected to the hydraulic oil tank through a hydraulic pipeline, the clutch oil cylinder is connected to the two-position four-way electromagnetic reversing valve and the pressure reducing valve, and a one-way throttle valve is installed on the clutch oil cylinder. The system can automatically adjust the electric proportional overflow valve at the pump outlet, thereby adjusting the size of the braking force. When the large anchor winch is anchored, the speed is limited within the required range to avoid impact and loss of control.

The invention relates to a hydraulic system, method, and integrated valve block for a slewing mechanism, comprising a first and second cylinder. The rod cavity of the first cylinder connects to the rodless cavity of the second cylinder through the first oil circuit, first hydraulic control check valve, and fourth oil circuit. The rodless cavity of the first cylinder connects to the rod cavity of the second cylinder through the second oil circuit, second hydraulic control check valve, and third oil circuit. The first oil circuit is connected to the directional valve through the sixth oil circuit, and the second oil circuit is connected to the directional valve through the fifth oil circuit. The directional valve is connected to the hydraulic pump and oil tank. The first hydraulic control check valve is installed between the first and fourth oil circuits, and the second hydraulic control check valve is between the second and third oil circuits. The check valves' control circuits connect to the sixth oil circuit, ensuring braking stability of the slewing mechanism.

The invention relates to the technical field of hydraulic control, and provides a hydraulic cylinder control system and method. The water-based proportional directional valve comprises a first proportional pilot valve group, a first proportional directional valve, a second proportional pilot valve group and a second proportional directional valve, the first proportional pilot valve group and the second proportional pilot valve group are respectively connected with the hydraulic support controller, the first proportional pilot valve group is connected with the first proportional directional valve, and the second proportional directional valve is connected with the second proportional directional valve. The second proportional pilot valve group is connected with the second proportional reversing valve; the hydraulic cylinder comprises a first cavity and a second cavity, the first cavity is connected with the first proportional directional valve, and the second cavity is connected with the second proportional directional valve. The stroke of the hydraulic cylinder can be accurately controlled, and accurate control over the hydraulic support and the whole working face is achieved; the water-based proportional reversing valve is simple in structure and high in response speed, and the control accuracy of the hydraulic cylinder is further improved.

A dynamic testing system includes a test station and at least one controller. The test station includes a hydraulic actuator configured to drive an actuation of a test subject using a hydraulic fluid flow, and a control valve that includes a housing, a valve body contained within the housing having a position that controls a flow rate and direction of the hydraulic fluid flow, a valve body driver configured to adjust the position of the valve body based on a reference signal, and a valve position sensor configured to output a position signal that is indicative of the position of the valve body. The at least one controller is configured to obtain a current position of the valve body using the position signal, obtain a diagnostic reference, detect a diagnostic condition based on a difference between the current position and the diagnostic reference, and generate a diagnostic signal.

The hydraulic system is applied to an injection molding machine and comprises a mold locking control loop and a glue injection control loop, the mold locking control loop comprises a first direction valve, a second direction valve, a third direction valve, a fourth direction valve, a first cartridge valve, an overflow valve and a safety valve, the pressure maintaining device is arranged to lock the mold at preset pressure and maintain the pressure; and the glue injection control loop is connected with the mold locking control loop, comprises a hydraulic lock, a plurality of direction valves, a second cartridge valve and a proportional overflow valve, and is set to control the density of molten glue through proportional molten glue back pressure. The injection molding machine solves the problem of low production efficiency of plastic products of an injection molding machine in the prior art.

A bi-directional valve with valve elements having compliant features biasing them together to maintain a sealing interface that defines a fluid communication barrier within the valve. Parting the valve elements from one another removes the sealing interface allow fluid communication across the valve elements. The valve includes a side port and a choke member that selectively blocks fluid flow through the valve when moved adjacent the side port and selectively opens the valve to fluid communication when moved away from the side port. The choke member remains adjacent the side port until the valve elements are spaced a distance apart greater than that at which valve erosion or fluid cavitation occurs. Also included with the valve are systems for counterbalancing forces exerted onto the valve from differential pressures.

A regulator valve has a check valve manifold for use in subsea control circuits. For example, the regulator valve having the check valve manifold can be used in a circuit between a directional control valve and an actuator for a gate valve. The check valve manifold can have a flange that attaches to the regulator valve to communicate with the supply-side and outlet-side of the regulator valve. Internal communication inside the manifold includes a check valve. If the pressure in the circuit downstream of the regulator valve needs to be vented, the check valve can open to allow the pressure to bleed from the outlet-side back to the supply-side without needing to pass through the internal pressure control valve of the regulator.

The invention discloses a radial plunger hydraulic device and method for controlling flow distribution based on pilot reversing valves. The radial plunger hydraulic device comprises a shell, plunger assemblies arranged around the shell, an eccentric main shaft rotationally arranged on the shell, a high-pressure total port, a low-pressure total port and the pilot two-position three-way reversing valves, wherein the high-pressure total port and the low-pressure total port are formed in one side of the shell, and the pilot two-position three-way reversing valves correspond to the plunger assemblies one to one. A plunger cavity, an eccentric main shaft cavity, a shell high-pressure oil way, a shell low-pressure oil way and a shell working oil way are arranged in the shell; plunger assemblies are arranged in the plunger cavities, and the plunger assemblies are arranged in the corresponding plunger cavities in an up-down sliding mode; the eccentric main shaft is rotationally mounted in the eccentric main shaft cavity and is in transmission connection with all the plunger assemblies; the high-pressure oil paths in the shell are communicated with one another and are communicated with the high-pressure main port; the low-pressure oil way of the shell is communicated with each other in the shell and is communicated with the low-pressure main port, and the two-position three-way reversing valve is matched with the conduction of the high-pressure oil way and the low-pressure oil way in the shell to realize the bidirectional rotation of the radial plunger hydraulic device.

The invention discloses a hydraulic control system for a sliding gate of a tundish of a continuous casting machine, which relates to the technical field of hydraulic control systems and comprises an energy accumulator safety system and two oil cylinder control systems which are connected in parallel between an oil inlet main path and an oil return main path, the oil inlet main path is connected with an oil pump through a one-way valve; the energy accumulator safety system comprises an energy accumulator, a normally-open type high-pressure ball valve and an energy accumulator safety valve. The oil cylinder control oil way comprises a two-position four-way electromagnetic directional valve, a stacked type double-one-way throttle valve, a stacked type hydraulic control one-way valve, a first normally-closed type two-position two-way electromagnetic directional valve, a second normally-closed type two-position two-way electromagnetic directional valve and an oil cylinder. The hydraulic cylinder of the sliding nozzle can be stably controlled, and the energy accumulator safety system is arranged, so that the sliding nozzle can still be opened and closed for two to three times when an oil pump pauses in a sudden power failure state, and molten steel is prevented from being cooled and solidified.

The invention discloses a novel loader movable arm energy recovery and utilization system. Comprising an oil tank, a first one-way valve, a load-sensitive pump, a shuttle valve, a three-position four-way electromagnetic directional valve, a second one-way valve, a movable arm hydraulic cylinder, a first two-position two-way electromagnetic directional valve, a second two-position two-way electromagnetic directional valve, a hydraulic motor, a hydraulic pump, a third one-way valve, a two-position three-way electromagnetic directional valve, a safety valve, an energy accumulator, a pressure gauge and a two-position three-way hydraulic directional valve. According to the system, different ways can be selected for energy recovery in the energy accumulator according to different operation modes of the loader. When the movable arm of the loading machine descends, oil in the rodless cavity of the movable arm hydraulic cylinder enters the energy accumulator to store energy. When the movable arm ascends, hydraulic oil in the energy accumulator is pushed by atmospheric pressure to enter a rodless cavity of the movable arm hydraulic cylinder to release energy. The energy recovery rate and utilization rate of the movable arm of the loader can be increased, and the adaptability to different operation modes is high.

The invention relates to the technical field of electromagnetic directional valve control, and discloses an electromagnetic directional valve remote control system and a data processing method, and the system comprises a control instruction receiving and analyzing module, a dynamic response parameter determining module, a state data collecting and uploading module, a state data analyzing module and a control signal executing module. The method comprises the following steps: receiving a remote terminal reversing control instruction, and analyzing the instruction into adjustment parameters such as action times, switching directions and pressure thresholds; determining dynamic response parameters of a control node based on the parameters, executing adjustment, and collecting state data such as current and magnetic flux; uploading the data to an edge calculation unit, and generating a pulse width modulation correction value of the first control node through data fusion, frequency domain correlation analysis, wavelet domain dynamic compensation aggregation and other processing; and the parameters are transmitted to the fuzzy controller to calibrate the driving circuit parameters. The method improves the remote control precision and stability, and is suitable for industrial automatic intelligent control.

The utility model discloses an isostatic press lower end cover four oil cylinder synchronous lifting device, four corners of a tool platform are respectively provided with an oil cylinder, four corners of the tool platform are respectively provided with an installation groove, an installation adjusting seat is installed in the installation groove, and one end of each oil cylinder extends into the installation groove and is connected with the installation adjusting seat. The mounting adjusting seat comprises a lifting table, a spring and an electromagnetic mechanism which are sequentially arranged from top to bottom, a magnet layer is arranged on the side, close to the electromagnetic mechanism, of the lifting table, the other side of the lifting table is connected with an oil cylinder, and the lifting table is slidably connected with the mounting groove; a rod cavity and a rodless cavity of the oil cylinder are connected with an oil inlet way and an oil return way respectively, the oil inlet way and the oil return way are connected with the proportional directional valve through hydraulic control one-way valves respectively, and a one-way balance valve is arranged at the end, close to the oil cylinder, of the oil return way. In an initial state, the displacement values of the four oil cylinders are corrected and adjusted by installing the adjusting seat; in the lifting process, the moving speed of the four oil cylinders is adjusted through the proportional reversing valves, synchronous and stable lifting of the lower end cover is achieved, and good practicability is achieved.

The utility model relates to the field of hydraulic servo systems, and discloses a safety valve group for a hydraulic servo system, which comprises a valve block and is characterized in that a servo valve is mounted on the upper surface of the valve block, and a first fully-adjustable throttle valve is mounted on the upper surface of the valve block close to the left end of the servo valve. A second full-adjustment type throttling valve is installed at the position, close to the right end of the servo valve, of the upper surface of the valve block, an electromagnetic direction valve is installed on the upper surface of the valve block, a first balance type normally-open logic valve is installed on the left surface of the valve block, and a first balance type normally-closed logic valve is installed on the left surface of the valve block. And a second balance type normally-closed logic valve is mounted on the right surface of the valve block. According to the utility model, by adopting a new oil way design, the whole device has the advantages of simple structure, small valve body size, safety, reliability and the like, and meanwhile, the whole device can take pressure relief protection measures on a system in time according to working conditions, so that the safety of system equipment and operators is guaranteed.

The utility model discloses a hydraulic control system, which relates to the technical field of hydraulic control and comprises an oil tank, a hydraulic pump, a main cylinder, a first electromagnetic plug-in mounting direction valve, a second electromagnetic plug-in mounting direction valve and a third electromagnetic plug-in mounting direction valve. The main oil supply path is communicated with a rapid cavity of the main cylinder through a first electromagnetic plug-in mounting direction valve, the main oil supply path is communicated with a lower cavity of the main cylinder through a second electromagnetic plug-in mounting direction valve, the main oil supply path is communicated with an upper cavity of the main cylinder through a third electromagnetic plug-in mounting direction valve, and the upper cavity, the lower cavity and the rapid cavity of the main cylinder are all communicated with an oil tank through an oil return path; sliding valve control of a conventional hydraulic machine is replaced by cartridge valve control, the hydraulic machine is simple in structure and stable in performance, can be widely applied to the fields of game coins, souvenir medal, medal and the like, brings considerable benefits, and can adjust the drift diameter of corresponding cartridge valve combination parts according to actual conditions so as to improve the application range.

The utility model provides a breaking hammer with a high-sensitivity reversing valve, which comprises a drill rod and an impact main body, and a movable cavity is divided into a first movable cavity, a second movable cavity and a third movable cavity by an impact rod; the reversing valve is installed in the reversing valve cavity and provided with a sealing gasket, and when the reversing valve moves, the communicating part of the second reversing valve cavity and the third reversing valve cavity can be opened or closed; the first oil way communicates with the first movable cavity and the oil inlet way, the second oil way communicates with the second reversing valve cavity and the oil inlet way, one end of the third oil way communicates with the first reversing valve cavity, and the other end of the third oil way moves along with the impact rod to communicate with the first movable cavity or the second movable cavity. The fourth oil way is communicated with the third reversing valve cavity and the third movable cavity; the oil return path is communicated with the second movable cavity and the third movable cavity; the stress area of the side, facing the third movable cavity, of the impact rod is larger than that of the side, facing the first movable cavity, of the impact rod. According to the breaking hammer with the high-sensitivity reversing valve, an oil way can be opened and closed only through a short stroke, and the reversing response is fast.

The invention relates to the technical field of hydraulic control, and provides a load-sensitive type water-based proportional directional valve which comprises a valve body, a first valve element, a second valve element, a first valve element and a second valve element. The main valve element is movably arranged in the valve body, a main valve element hole and a second connector connected with a controlled load are formed in the main valve element, the main valve element hole is connected with the liquid inlet and the second connector, and the second connector is further connected with the liquid return opening; the valve seat is movably arranged in the valve body and is in contact connection with the main valve element, the end, away from the valve body, of the valve seat is connected with the valve body to form a control cavity, and the control cavity communicates with the first connector; when the pilot valve working port selectively communicates with a liquid inlet pipeline or a liquid return pipeline, a working medium in the control cavity can act on the main valve element and the valve seat, so that the second connector selectively communicates with the liquid inlet or the liquid return port, and therefore work of the controlled load is controlled. According to the invention, load-sensitive proportion control can be realized, and the service life of the controlled load is prolonged.

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.