32results about "Servomotors" patented technology

The invention relates to a load-sensitive electric proportional multi-loop valve. The load-sensitive electric proportional multi-loop valve aims to enable all loops to work with different loads, save energy and reduce environmental pollution. According to the technical scheme, the load-sensitive electric proportional multi-loop valve comprises a main oil path, a raising loop, an inclined joint, an attachment joint, a logical direction valve, a two-way solenoid valve, a proportional electric overflow valve and a two-way hydraulic control reversing valve, the main oil path is communicated with two gear pumps P1, P2, the raising loop is connected to the main oil path through an electronic proportional pressure compensation flow control valve, the inclined joint and the attachment joint are connected to the main oil path through an electronic proportional pressure compensation flow control valve, the logical direction valve is connected to the main oil path, the two-way solenoid valve and the proportional electric overflow valve are connected to an oil inlet of the logical direction valve, and the two-way hydraulic control reversing valve is used for controlling whether the gear pump P2 supplies oil to the main oil path or not. The load-sensitive electric proportional multi-loop valve is applied to the technical field of hydraulic system control valves of 5-10t forklifts.

The invention, which belongs to the technical field of the continuous casting process, relates to a deviation-balancing-based lifting synchronization control method and apparatus of a tundish car. The method comprises the following steps: (1), determining proportional valve dead zones corresponding to four oil cylinders, and calculating dead zone compensation dosages of proportional valves and carrying out outputting; (2), according to deviation of a position setting value and an actual position value, calculating a single cylinder closed-loop controlling quantity and carrying out outputting; (3), on the basis of deviation of a synchronization target value and an actual position, calculating a synchronization closed-loop controlling quantity and carrying out outputting; and (4), calculating a final controlling quantity and outputting the quantity information to the four proportional valves. According to the invention, dead zone compensation is carried out automatically based on the actual parameter change and response speeds of controlled oil cylinders corresponding to the proportional valves are improved. A single-cylinder deviation controller and a synchronous deviation balancer are used for limiting a single-cylinder error and a synchronous error; and thus the control precision is improved and rapid and stable operation of the lifting platform of the tundish car can be guaranteed. Problems of large synchronization deviation of the lifting system of the tundish car, unstable operation, slow hydraulic component speed, and high maintenance cost and the like can be solved.

The invention discloses an integrated electro-hydraulic servo driver hydraulic system which comprises a drive motor, a hydraulic pump, a first check valve, a second check valve, an electromagnetic reversing valve, an overflow valve, a servo valve, a hydraulic cylinder, a sealed boosting oil tank and a first throttling valve. The drive motor is connected with the hydraulic pump. The oil outlet of the hydraulic pump is connected with the first check valve. The first check valve is divided into three liquid ways at the same time. The first liquid way is connected with the port P of the electromagnetic reversing valve. The port T of the electromagnetic reversing valve is connected with the second check valve. The second liquid way is connected with the port P of the overflow valve. The port T of the overflow valve is connected with the second check valve. The third liquid way is connected with the port P of the servo valve. The port T of the servo valve is connected with the second check valve. The port A and the port B of the servo valve are communicated with the port A and the port B of the hydraulic cylinder respectively. The second check valve is sequentially connected with the sealed boosting oil tank and the port P of the first throttling valve. The port T of the first throttling valve is connected with the oil sucking opening of the hydraulic pump. The hydraulic system is not prone to heating and can stand by for a long time.

The invention discloses a hydraulic system of a single-cylinder pin type telescopic arm. The hydraulic system comprises an arm pin cylinder, a cylinder pin cylinder and a control oil path, wherein a system pressure oil path can provide oil for the arm pin cylinder or the cylinder pin cylinder through the control oil path; an oil supply branch of the control oil path comprises an energy accumulator and an unloading valve; the unloading valve is positioned at an upstream position of the energy accumulator, has two working stations and is configured to communicate with the oil supply branch when being positioned at the first working station and communicate with the system pressure oil path and a system oil return path when being positioned at the second working station. When the control oil path provides oil for the arm pin cylinder or the cylinder pin cylinder to unlock the cylinder and keep the cylinder in an unlocked state, the unloading valve is positioned at the second working station to communicate with the system pressure oil path and the system oil return path; the pressure of the control oil path is maintained by the energy accumulator, so that the arm pin or the cylinder pin is kept in the unlocked state; the hydraulic system guarantees that no overflow loss exists when the arm pin or the cylinder pin is kept in the unlocked state. The invention also provides a control method of the single-cylinder pin type telescopic arm. In addition, the invention also discloses a crane with the hydraulic system.

The invention discloses a positive-and-negative pressure driving device for a mounting tool of a cold shrinking cable sealing cap. The positive-and-negative pressure driving device consists of an engine body, a hydraulic pump component, a negative-pressure output component and an adjustable pressure-limiting valve, wherein a pedal is mounted outside the engine body; the hydraulic pump component consists of a piston pump and an oil tank, and the piston pump is driven by the pedal; the negative-pressure output component comprises a hydraulic negative-pressure cylinder, the input end of the hydraulic negative-pressure cylinder is connected with the piston pump and also connected with the oil tank through a valve I, the output end of the hydraulic negative-pressure cylinder is connected with a negative-pressure output joint and also connected with a gas inlet through a valve III, and the hydraulic negative-pressure cylinder is driven by hydraulic oil to output negative pressure; the input end of the adjustable pressure-limiting valve is connected with the piston pump, the output end of the adjustable pressure-limiting valve is connected with a hydraulic oil output joint and also connected with the oil tank through a valve II, and the adjustable pressure-limiting valve is used for ensuring that the piston pump preferably provides hydraulic oil for the hydraulic negative-pressure cylinder. The structure of the positive-and-negative pressure driving device is simplified, and the total equipment cost and the failure rate are lowered; the positive-and-negative pressure driving device finishes the operation mainly by foot stepping, the mounting efficiency of the cold shrinking cable sealing cap is improved, and the positive-and-negative pressure driving device is compact in structure, convenient to carry and flexible in use.

The invention relates to a synchronous hydraulic transmission system, which consists of four modules, namely a water supply module, a control valve bank, a synchronous hydraulic cylinder group and a water-compensating exhaust module, wherein the water supply module supplies water to the system through a water pump; the control valve bank is a high-flow three-position four-way valve; the synchronous hydraulic cylinder group is formed by connecting a sucker rod cavity of a large hydraulic cylinder and a rodless cavity of a small hydraulic cylinder in series through an intermediate communicating pipeline; and the intermediate communicating pipeline is connected with a pipeline and the water-compensating exhaust module respectively. Adopting tap water as a hydraulic transmission medium, the synchronous hydraulic transmission system has the advantages of energy conservation, environmental protection and accurate positioning, prevents hydraulic oil from polluting water quality, meets the requirements of special application occasions, and can be applied in engineering environment of subaqueous elevating stages, the start and stop of water conservancy gates, shipping machines, mining machines and the like.

The present invention allows the number of components to be reduced and assembly work to be easily performed. A cylinder drive manifold device that constitutes a cylinder drive apparatus is provided with a block-shaped manifold in which a plurality of holes are formed for circulating a fluid used for driving a plurality of fluid pressure cylinders. The manifold is configured such that a plurality of switching valves for supplying a fluid alternately to a first cylinder chamber and a second cylinder chamber of each of the fluid pressure cylinders are attachable. A plurality of check valves and a plurality of throttle valves are incorporated into the plurality of holes of the manifold.

A hydraulic actuator provided with a hydraulic pump and a hydraulic cylinder unit. The hydraulic pump has a first suction and discharge opening and a second suction and discharge opening and can be reversely operated. The hydraulic cylinder unit is provided with a piston, a sleeve having an inner space partitioned by the piston into a first pressure chamber and a second pressure chamber, and a piston rod connected to the piston and having a front end projecting to the outside of the sleeve. The hydraulic actuator is provided with first piping for interconnecting the first pressure chamber and the first suction and discharge opening, and also with second piping for interconnecting the second pressure chamber and the second suction and discharge opening. When the hydraulic piston is reversely operated, hydraulic pressure is alternately applied to the first and second pressure chambers to vertically move the piston. The hydraulic actuator is further provided with a bypass pipe for interconnecting the first and second piping and also with an accumulator provided in the middle of the bypass pipe and applying back pressure to the first and second pressure chambers. A vibration test device equipped with the hydraulic actuator is also provided.

A comparison determination unit of a hydraulic control device determines whether a characteristic abnormality occurs in at least one hydraulic sensor of an output pressure sensor and a lateral pressure sensor by comparing an output pressure detected by the output pressure sensor and a lateral pressure detected by the lateral pressure sensor. An individual determination unit determines whether the characteristic abnormality occurs in the hydraulic sensor as a determination target by individually determining whether the output pressure and the lateral pressure are out of a predetermined range. A characteristic abnormality detection unit determines the hydraulic sensor in which the characteristic abnormality occurs by using each determination result in the comparison determination unit and the individual determination unit.

A ball mill hydraulic control system based on AMESim uses a common one-way hydraulic pump model 4 as the power component of the system, and uses a three-position four-way electromagnetic reversing valve 9 to control the steering of the ball mill. The control of the hydraulic system of the ball mill is stable, the failure rate is low, and the pollution resistance is good, which reduces the danger during maintenance and reduces maintenance costs.

The embodiment of the invention discloses an electro-hydraulic control pressure shutoff system used for a hydraulic support vertical column. The electro-hydraulic control pressure shutoff system comprises a liquid inlet main pipeline, a liquid returning main pipeline, a pressurizer, two hydraulic control one-way valves, two hydraulic control two-position three-way reversing valves and two electromagnetic reversing valves. The liquid inlet main pipeline comprises a first branch and a second branch; the liquid returning main pipeline comprises a third branch and a fourth branch; the first branch is connected with inlets of the two electromagnetic reversing valves; emittings of the two electromagnetic reversing valves are connected with control openings of the two hydraulic control two-position three-way reversing valves; oil returning openings of the two electromagnetic reversing valves are connected with the third branch; the second branch is connected with inlets of the two hydraulic control two-position three-way reversing valves; oil returning openings of the two hydraulic control two-position three-way reversing valves are connected with the fourth branch; and an emitting of the pressurizer used for being connected with an annular cavity. The embodiment of the invention discloses an electro-hydraulic control pressure shutoff method used for the hydraulic support vertical column. By utilizing the electro-hydraulic control pressure shutoff system and method used for the hydraulic support vertical column, the disassembling efficiency of a middle cylinder guide sleeve can be improved.

The invention provides a screw machine closed type hydraulic system for a shield machine and the shield machine. The screw machine closed type hydraulic system comprises a screw machine main pump loop connected with a screw machine pump (1), an oil supplementing oil path connected with an oil supplementing pump (2), a main pump control loop connected with a servo oil cylinder (3), and a control valve group connected with the screw machine main pump loop and the main pump control loop; and the servo oil cylinder (3) controls a swash plate of the screw machine pump (1). The screw machine closed type hydraulic system has the beneficial effects that the system can be protected against damage by releasing pressure to the other path when one path of high pressure of the main loop exists, meanwhile, redundant heat of the system can be brought back to an oil tank through the oil path on the low-pressure side, and pump damage caused by overheating of the system is avoided.

The invention discloses a hydraulic system, which comprises a floating oil cylinder, a balance valve for delivering oil to the cavity of the floating oil cylinder, and a reversing valve connected with the balance valve; the reversing valve is connected with an oil supply pump for oil supply; The travel system oil supply port used to supply oil to the reversing valve, the reversing valve is connected to the travel system oil supply port through the first one-way valve, and the reversing valve is connected to the oil supply pump through the second one-way valve. In the hydraulic system provided by the present invention, the main oil supply operation is performed to the floating oil cylinder in the system through the oil supply port of the walking system, and the auxiliary oil supply operation is performed to the floating oil cylinder in the system through the oil supply pump, so that the oil supply operation of the floating oil cylinder It can be mainly obtained from the walking system, and the flow rate on the oil supply side of the oil supply pump can be reduced to a small state, so there will be no continuous flow high-pressure overflow, and the efficiency will be significantly improved. The invention also discloses a scissor type aerial work platform comprising the hydraulic system.

The invention relates to an operating system and method for an electric hydraulic gripping apparatus in container loading and unloading equipment. The operating system comprises an electric hydraulic power system, a loading and unloading action control system and an energy accumulation system; the operating system communicates with an oil tank through an oil return pipeline and an oil outlet pipeline; and an oil pump, a pressure regulating valve and a one-way valve are sequentially arranged on the oil outlet pipeline; a throttling valve and a switching valve are sequentially arranged on an energy accumulation pipeline connecting the one-way valve on the oil outlet pipeline with the energy accumulation system; and the energy accumulation system comprises a plurality of energy accumulators. According to the operating system and method for the electric hydraulic gripping apparatus in the container loading and unloading equipment, the efficiency is improved.

A hydraulic system is provided, the hydraulic system including a hydraulic load defining a first chamber and a second chamber. Additionally, the hydraulic system includes a pressure source, a fluid storage vessel, a load sense line, and a spool valve. The spool valve fluidly connects the fluid storage vessel to one of the first or second chambers and fluidly connects the pressure source to the other of the first or second chambers. A bypass line is also provided defining a flow path between the hydraulic load and the fluid storage vessel that bypasses the spool valve. Fluid flow may encounter less resistance through the bypass line, such that the hydraulic system may run more efficiently and with a reduced risk for cavitation in the hydraulic load.

A drive device for construction equipment according to the present invention comprises: a first pump flow path that is connected to a first hydraulic pump; a first supply flow path and second supply flow path that are connected to the first pump flow path; a first branch flow path and a second branch flow path that are connected to the first supply flow path; a third branch flow path and a fourth branch flow path that are connected to the second supply flow path; a first main controlled valve that is connected to the first branch flow path and the third branch flow path; a second main controlled valve that is connected to the second branch flow path and the fourth branch flow path; a first bucket flow path that is connected to the first branch flow path via the first main controlled valve, and to the cap-side space in the bucket cylinder; a second bucket flow path that is connected to the third branch flow path via the first main controlled valve, and to the rod-side space in the bucket cylinder; a first arm flow path that is connected to the second branch flow path via the second main controlled valve, and to the rod-side space in the arm cylinder; and a second arm flow path that is connected to the fourth branch flow path via the second main controlled valve, and to the cap-side space in the arm cylinder.

The invention provides a double-pump separate-cavity adjusting control load simulation system. The double-pump separate-cavity adjusting control load simulation system comprises a simulator loading system and a steering engine system, and the simulator loading system comprises two hydraulic pumps, a loading actuator, a speed sensor and a force sensor. Two bidirectional metering pumps are separately connected with two cavities of the loading actuator, so that the flow or pressure of the two cavities of the loading actuator is adjusted, each bidirectional metering pump has two working modes including a flow control mode and a pressure control mode, a controller can generate a loading control instruction based on a load spectrum instruction and a force sensor feedback signal, the bidirectional metering pumps in the pressure control modes are adjusted, and the regulation and control on the pressure state of one cavity of the loading actuator are realized; and the controller can further generate a speed control instruction based on a speed reference instruction generated on line and a speed feedback signal of the loading actuator, and the flow state of the other cavity of the loading actuator is adjusted by adjusting the bidirectional metering pumps in the flow servo mode so as to decouple active motion interference of a steering engine.

The novel internal circulation engine comprises an oil tank and a main body part connected with the oil tank, the oil tank comprises an oil pump pipe and an oil return pipe, the main body part comprises a plurality of air cylinders, a crankshaft, middle teeth and a cam shaft, the air cylinders are annularly and evenly distributed on the periphery of the crankshaft, and each air cylinder comprises an inlet accelerator, an exhaust accelerator and a piston. Oil enters the main body part through an inlet accelerator of one of the multiple air cylinders, the cam shaft and the crankshaft are driven to rotate through hydraulic pressure, the oil sequentially enters the inlet accelerators of all the air cylinders, the oil enters the oil return pipe through an exhaust accelerator, and after the oil enters one of the multiple air cylinders through an oil tank, the oil enters the oil return pipe through the exhaust accelerator. According to the technical scheme, the crankshaft connected with the oil tank is hydraulically driven, so that the crankshaft and the cam shaft in transmission connection with the crankshaft are driven to rotate, oil in the oil tank enters the air cylinder through the oil pump pipe to push the piston, step-by-step internal circulation power driving of the engine is achieved, resource use is effectively reduced through the design of the scheme, and practicability is high.

The invention relates to a piston-cylinder unit (40) for hydraulic actuation of a clutch in a vehicle, comprising a piston (42), a cylinder (41) and a sealing means (43), wherein the piston cylinder unit is fluidically linked to a fluid circuit (44), wherein the piston (42) is axially displaceable in the cylinder, and wherein the sealing means is arranged sealingly between the piston and the cylinder, characterized in that a sensor is arranged in or on the piston-cylinder unit, by means of which sensor a pressure can be measured in the interior of the piston-cylinder unit and/or in the fluidically linked fluid circuit. The invention further relates to a method for operating the piston-cylinder unit.

The invention discloses a hydraulic driving system for a notching machine. The hydraulic driving system comprises a first hydraulic pump (6), a second hydraulic pump (5), a three-position four-way reversing valve (17), a three-position four-way reversing valve (18.1), a three-position four-way reversing valve (18.2), a clamping cylinder (22) and a notching cylinder (21), wherein the first hydraulic pump (6) is connected to a first oil port of the three-position four-way reversing valve (17); the second hydraulic pump (5) is connected to a second oil port of the three-position four-way reversing valve (17) and a first oil port of the three-position four-way reversing valve (18.1); and a third oil port of the three-position four-way reversing valve (17) is connected to the first oil port of the three-position four-way reversing valve (18.1). The hydraulic driving system performs a clamping action and a notching action with large applied force and small applied force through two hydraulic pumps and 3 to 4 three-position four-way reversing valves, and has the advantages of simple structure and reliable actions.

An excavator hydraulic control system and method, relating to the technical field of excavator hydraulic control, including a LUDV load sensing valve, a control unit, a preset number of gear pumps, and two-position three-way electric control valves corresponding to the gear pumps one by one; The oil inlet of the two-position three-way electric control valve is connected to the oil outlet of the corresponding gear pump, and the two oil outlets of the two-position three-way electric control valve are respectively connected to the oil inlet of the LUDV load sensing valve. Each two-position three-way electric control valve is respectively connected to the control unit. The LS port of the LUDV load sensing valve is connected to a pressure sensor, and the pressure sensor is connected to the control unit. The control unit is divided into three The two-position three-way electric control valve is controlled in two stages. This excavator hydraulic control system and method have different flow rates under different pressures, thus solving the problem of energy loss due to the overflow of the overflow valve in the traditional excavator hydraulic control system and method. The problem.

The invention discloses a load compensation balance valve. The problem that an existing balance valve of a gravity system is poor in speed regulation capacity in an actual use process is solved. The valve comprises a valve body and a valve core, wherein the valve body is provided with a first oil port and a second oil port, the two ends of the valve core are provided with a control cavity and a spring cavity, the valve core is provided with a first channel, The first channel communicates with the first oil port, and the valve core has a first state that isolates the first oil port from the second oil port and a second state that enables the first oil port to communicate with the second oil port. When the valve core is in the second state, pressure oil of the first oil port communicates with the spring cavity through the first channel and a first throttling port, and spring force of the spring cavity and pressure for picking up the pressure oil of the first oil port by the spring cavitycooperate with each other to mutually balance control force of the control cavity so as to control an opening of the valve core. The valve also has the advantages of simple structure, convenient assembly, reliable action, long service life and the like.

The invention relates to a lithium battery pole piece rolling mill pump control roll bending hydraulic system and a roll bending device. Roll bending cylinders are arranged at the left and right endsof upper and lower bearing seats of the roll bending device, a set of pump control roll bending hydraulic system is arranged on the outer side of each roll bending cylinder, and a roll bending pressure instruction is given to a controller; and the controller outputs a rotating speed signal to control a servo motor to drive a two-way constant displacement pump to rotate to build up pressure, a first oil port of the two-way constant displacement pump sucks oil from rodless cavities of the roll bending cylinders through a low-pressure hole channel and a low-pressure pipeline, and a second oil port of the two-way constant displacement pump presses oil to rod cavities of the roll bending cylinders through a high-pressure hole channel and a high-pressure pipeline. Hydraulic roll bending force generated by the roll bending cylinders enables a roll to generate additional bending so as to compensate for roll gap transverse spacing deviation and improve the consistency of the pole piece rollingthickness. High-precision rolling of battery pole pieces can be achieved, the installation, operation and maintenance cost of the system is reduced, the power-to-weight ratio is increased, and the reliability is improved.