47results about How to "No overflow loss" patented technology

The invention discloses a hydraulic driving system for an offshore drilling compensation winch.A hydraulic secondary regulation element and a driven hydraulic cylinder jointly drive the winch to fulfill a heave compensation function, and a bit feeding hydraulic motor drives the winch to fulfill an automatic bit feeding function.During compensation, the driven hydraulic cylinder and a liquid-gas energy storage device thereof are used or bearing all static loads of a drilling rig and periodically recovering and releasing gravitational potential energy of loads; the hydraulic secondary regulation element operates in a constant-pressure network to overcome other loads in the compensation process, and the liquid-gas energy storage device periodically recovers and releases inertia kinetic energy of the a winch rotary system.During bit feeding, the driven hydraulic cylinder and the liquid-gas energy storage device thereof recover the gravitational potential energy of the loads of the drilling rig and release in lifting of a drilling rig traveling system.The hydraulic driving system is integrally compact in structure, a hydraulic energy recovery system is high in operation efficiency and long in service life, and an engine is low in power and power consumption.

The invention discloses a pump-controlled CVT (continuously variable transmission) electric hydraulic control system, which comprises a driving wheel hydraulic cylinder, a driven wheel hydraulic cylinder, a speed ratio control hydraulic loop, a clamping force control hydraulic loop, a controller and two pressure sensors. Effective areas of the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder are equal; the speed ratio control hydraulic loop comprises a motor II and a bidirectional hydraulic pump, and oil ports of two ends of the bidirectional hydraulic pump are respectively communicated with the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder; the clamping force control hydraulic loop comprises a motor I, a hydraulic pump, an energy accumulator and one-way valves; an oil outlet of the hydraulic pump is respectively communicated with the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder via the two one-way valves; and two pressure sensors are respectively mounted on pipelines communicated with the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder. The oil inlet port and the oil outlet port of the bidirectional hydraulic pump in the speed ratio control hydraulic loop are respectively communicated with the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder via pipelines, pressure differences of the inlet port and the outlet port of the bidirectional hydraulic pump is reduced, consumption of power of a speed ratio adjusting hydraulic pump is not high, flow of a pressure control hydraulic pump is quite low, the pressure control hydraulic pump only supplements leakage of the system, and consumed power is lower.

The invention discloses a load sensing heat dissipation braking variable system of a loading machine. The load sensing heat dissipation braking variable system of the loading machine is characterized by mainly being composed of a variable displacement piston pump, a parking braking valve, a first energy accumulator, a second energy accumulator, a braking valve and a load sensing prefilling valve in an integral mode. A pressure oil port of the load sensing prefilling valve is connected with a pressure oil port of the variable displacement piston pump. Pressure oil is provided for the energy accumulators and working devices in a prefilling state. Pressure oil used for controlling a limit switch (LS) is output to control the variable displacement piston pump to provide flow required by a system. Priority of prefilling is maintained. A temperature signal of the heat dissipation system is converted into an electric signal to control an electric proportional pressure reducing valve in the load sensing prefilling valve, and the prefillig is prior. The variable displacement piston pump is a load sensing plunger pump comprising an LS control valve and a pressure stop valve and is capable of controlling a variable pump tilting tray to provide the flow required by the system. The load sensing heat dissipation braking variable system of the loading machine has the advantages of being easy to realize, saving in energy, and suitable for being used on loading machines of various tonnage.

The invention provides a novel adjusting system for stationary blades of an axial flow fan. The system comprises a servo motor, a bidirectional quantitative gear pump and an oil tank, wherein the bidirectional quantitative gear pump is fixedly arranged in the oil tank and driven by the servo motor to rotate. The system further comprises two hydraulic cylinders, and adjusting oil cylinders which are correspondingly connected with the two hydraulic cylinders and used for adjusting the angles of the stationary blades; the bidirectional quantitative gear pump correspondingly communicates with the two hydraulic cylinders through two oil channels and supplies pressure oil to the two hydraulic cylinders; the hydraulic cylinders can drive the adjusting oil cylinders to adjust the angles of the stationary blades. The system provides position close-loop control and pressure close-loop control, so that the rotating speed of the servo motor and the position and pressure of a hydraulic system can be accurately controlled to meet various working requirements of the stationary blade adjusting system; the system can accurately adjust the angles of the stationary blades and has the advantages of saving energy, being environmentally friendly, and insensitive to oil pollution, and greatly reducing the capacity of a hydraulic device.

The invention discloses a hydraulic steering system for engineering machinery, and belongs to the technical field of hydraulic systems for the engineering machinery. The system comprises a steering pump and steering cylinders controlling the steering of the engineering machinery through a steering gear, wherein a priority valve is communicated with an oil way between the steering gear and the steering pump; a first hydraulic control reversing valve is communicated in series in an oil way between a third oil port of the steering gear and a second oil port of the priority valve; a shuttle valve, a second hydraulic control reversing valve and an engine-driven reversing valve are communicated in series in an oil way between the hydraulic control port of the first hydraulic control reversing valve and the first oil port of the steering pump; limiting blocks are respectively arranged on both sides, corresponding to the engine-driven reversing valve, of a vehicle frame of the engineering machinery. A hydraulic circuit control manner disclosed by the invention is simple and reliable. During the steering at a limit position of the cylinders, the system does not have a spill loss and hydraulic impact on the vehicle frame by the steering cylinders at the limit position is eliminated, so that energy is saved, rocking does not occur when the steering is finished, and the comfort of the whole vehicle is increased.

The invention discloses a hydraulic steering system of an engineering machine and belongs to the technical field of hydraulic systems of engineering machines. The hydraulic steering system comprises a control part and a driving part, the control part comprises a steering gear, and the driving part comprises a steering oil cylinder and a steering pump. An amplification flow valve is serially communicated between the steering pump and the steering oil cylinder, a main valve spool controlling oil flow is arranged in the amplification flow valve, two liquid-control ports of the main valve spool are communicated with two oil outlets of the steering gear through liquid-control reversing valves, liquid-control ports of the liquid-control reversing valves are communicated with the steering pump through a maneuvering reversing valve and a pressure reducing valve. Limiters are arranged on a frame of the engineering machine and correspond to two sides of the maneuvering reversing valve. The hydraulic steering system is simple and reliable in hydraulic loop control manner, no overflow loss of the hydraulic steering system is caused when the engineering machine steers at the limit position of the oil cylinder, hydraulic impact to the frame from the limit position of the oil cylinder during steering is eliminated, energy is saved while shaking after steering is avoided, and comfortableness of the integral engineering machine is improved.

The invention relates to a hydraulic system, solves the problem that variable-displacement steering pumps cannot perform variable-displacement control on working hydraulic systems when the working hydraulic systems in existing fixed-displacement and variable-displacement hydraulic systems act, and provides a fixed-displacement and variable-displacement hydraulic system of a loading machine. The fixed-displacement and variable-displacement hydraulic system comprises a steering hydraulic system and a working hydraulic system; the steering hydraulic system comprises a variable-displacement steering pump, a pressure-gradient control valve, a steering gear, a steering oil cylinder and the like; the working hydraulic system comprises a fixed-displacement pump, a distribution valve, a hydraulic actuator, a pilot valve, a shuttle valve group and the like; when a pilot handle acts, a load signal acquired from the distribution valve is transmitted to a load simulating valve on a bypass from a steering pump to the distribution valve, the differential pressure of the loading pressure acquired by the pump and the distribution valve is amplified by the aid of the difference between acting areasof two differential pressure of the load simulating valve, the amplified differential pressure finally acts on a flow control valve of the steering pump, and variable-displacement control on the working hydraulic system by the variable-displacement steering pump is realized.

The invention discloses a hydraulic cylinder position control system and control method based on bidirectional pressure inputting adjustment. The system involves a hydraulic cylinder, two symmetrically-arranged servo driving devices, a displacement sensor and a motion control unit used for distributing output, wherein the two servo driving devices are connected to an inlet and an outlet of the hydraulic cylinder respectively, the displacement sensor is connected with a piston of the hydraulic cylinder to obtain displacement information, the displacement sensor is connected with the motion control unit, and the motion control unit is connected with the two servo driving devices to form a closed-loop control loop. According to the control system and the control method, the responsiveness isvery high, the speed control range is wide, the controllability of the piston is good, the position can be bidirectionally adjusted at any speed and load, position deviation is eliminated, regenerative energy recovery can be carried out through direct current parallel connection, and energy is further saved.

The invention discloses a wheel-legged robot and a leg joint driving device thereof, and belongs to the technical field of wheel-legged robots. The wheel-legged robot comprises a hydraulic control system, wherein the hydraulic control system comprises a hydraulic cylinder, a piston rod, a main oil path, a secondary oil path, a servo motor and a hydraulic pump; a bearing cavity and a non-bearing cavity are formed in the hydraulic cylinder; the piston rod is used for separating the bearing cavity from the non-bearing cavity; the servo motor is used for driving the hydraulic pump; the non-bearingcavity, the main oil path, the hydraulic pump, the secondary oil path and the bearing cavity communicate with one another in sequence; and the elongation of the piston rod relative to the hydraulic cylinder is changed along with change of the capacity of hydraulic oil in the bearing cavity and the non-bearing cavity. According to the wheel-legged robot and the leg joint driving device thereof, overflow loss and throttling loss are avoided, the system power is saved, the transmission efficiency of the hydraulic system is high, the energy utilization rate is high, the buffering performance is good, and the service life is long.

The invention relates to an air spring assembly, comprising an integrated control valve assembly for admitting compressed air into a spring pressure chamber (6) formed between an outer tube (1), a rolling tube (3), and an air spring bellows (5) that connects these components, wherein the control valve assembly consists of an individual air inlet valve (8) and an individual air outlet valve (9), which can be actuated by likewise integrated mechanical actuating elements in accordance with the air spring stroke position in order to admit air into or let air out of the spring pressure chamber (6), wherein the air inlet valve (8) is arranged opposite the air outlet valve (9) with actuating tappets (8a; 9a) facing each other, wherein the mechanical actuating elements that act on the actuating tappets while lying therebetween comprise a switching rod (10) attached to the outer tube (1) or rolling tube (3) at one end, the sliding tracks (11a, 11b) of which switching rod, which are opposite each other and which are each associated with one of the actuating tappets (8a, 8b), act on the actuating tappets (8a; 8b) in order to actuate the valves in dependence on the stroke position.

The invention relates to a multi-way valve, and discloses a load-sensitive multi-way valve, a boom hydraulic control system and a concrete pump truck. The load-sensitive multi-way valve comprises an oil inlet unit, at least one working unit, a main oil inlet path for communicating an oil inlet of the oil inlet unit with oil inlets of the working units, a main oil return path for communicating with an oil return port of the oil inlet unit and oil return ports of the working units, and a load feedback oil path for communicating with a feedback oil port of the oil inlet unit and feedback oil ports of the working units, wherein the oil inlet unit comprises a flushing mechanism, the flushing mechanism is connected between the main oil inlet path and the main oil return path, and the flow pumped into the oil inlet unit can be unloaded when the system is in a neutral-position standby state. The load-sensitive multi-way valve not only can prevent the temperature of local oil at the outlet of a variable pump and in the shell from being too high, but also is good in flow stability and free of excessive high-pressure oil overflow loss.

The invention discloses a wheeled leg robot and a driving method thereof, and belongs to the technical field of wheeled leg robots, the wheeled leg robot comprises a vehicle body, thighs, shanks, wheels and two hydraulic control systems; one end of the thigh is hinged with the vehicle body, and the other end is hinged with one end of the shank; wheels are arranged at the other ends of the shanks;the two hydraulic control systems control the included angle between the vehicle body and the thigh and the included angle between the thigh and the shank respectively. The hydraulic control system comprises a hydraulic cylinder and a piston rod; a bearing cavity, a non-bearing cavity and a spring are arranged in the hydraulic cylinder; the piston rod divides the bearing cavity and the non-bearingcavity; and the spring is used for enabling the rod part of the piston rod to tend to extend out of the hydraulic cylinder. According to the wheeled leg robot and the driving method thereof, overflowloss and throttling loss are avoided, the system power is saved, the transmission efficiency of a hydraulic system is high, the energy utilization rate is high, the buffering performance is good, andthe service life is long.

The invention discloses a load sensitive control hydraulic system of a pile driver, which comprises a load sensitive multi-way valve, a load sensitive variable pump, a walking motor, a hydraulic hammer, a left oil cylinder, a right oil cylinder, a front oil cylinder, a rear oil cylinder, a variable amplitude oil cylinder, a lifting oil cylinder, a lifting motor, a pilot pump, a pilot valve set and the like, wherein the load sensitive variable pump is connected with the load sensitive multi-way valve; the load sensitive valve controls execution elements such as the walking motor, the hydraulic hammer, the left oil cylinder, the right oil cylinder, the front oil cylinder, the rear oil cylinder, the variable amplitude oil cylinder, the lifting oil cylinder and the lifting motor, and the pilot pump and the pilot valve set control high and low speed switching of the walking motor. The load sensitive control hydraulic system is suitable for the hydraulic system of the road guardrail pile driver, can obviously reduce the power loss of the road guardrail pile driver and improve the work efficiency.

The invention discloses a wheeled leg robot and a driving method thereof, and belongs to the technical field of wheeled leg robots, the wheeled leg robot comprises a vehicle body, thighs, shanks, wheels and two hydraulic control systems; the hydraulic control system comprises a hydraulic cylinder, a piston rod and a motor gear control system; a bearing cavity and a non-bearing cavity are formed inthe hydraulic cylinder; the piston rod separates the bearing cavity from the non-bearing cavity; a hydraulic control system controls the extension of the piston rod relative to the hydraulic cylinderor controls the included angle between the vehicle body and the thigh through a motor gear control system; and the other hydraulic control system controls the extension of the piston rod relative tothe hydraulic cylinder or controls the included angle between the thigh and the shank through a motor gear control system. According to the wheeled leg robot and the driving method thereof, overflow loss and throttling loss are avoided, the system power is saved, the transmission efficiency of a hydraulic system is high, the energy utilization rate is high, the buffering performance is good, and the service life is long.

The invention relates to a laser welding clamp with double-sided inert gas protection. Comprising a ventilation base, an objective table, a ventilation nozzle, a baffle, a pressing block and a clamp. An objective table mounting groove is formed in the middle of the ventilation base, and a protective gas groove communicating with the objective table mounting groove is formed in the lower side of the middle of the objective table mounting groove; the objective table comprises an upper plate, a lower plate and a stand column connected with the upper plate and the lower plate, the upper plate is provided with an I-shaped groove, and the upper plate and the lower plate of the objective table, a baffle on the long side and a ventilation base body on the short side form a relatively sealed cavity; each side surface of the ventilation base is provided with two ventilation nozzles up and down; a test piece to be welded is placed on the lower plate, the clamp tightly presses the test piece through the pressing block, and the welding gun conducts welding through the long groove of the I-shaped groove. The objective table and the ventilation base are matched to form a relatively-closed protective gas chamber, the front face and the back face of a welding seam are protected by protective gas, the problems of air hole generation, oxidation, element burning loss, structure overburning and the like of the welding seam can be prevented, and the welding quality is improved.

The invention discloses a constant-tension winch hydraulic system. An oil outlet of the power pump set is communicated with an oil inlet of the pressure reducing valve, an oil outlet of the pressure reducing valve is communicated with a first oil port of the main control valve, a second oil port of the main control valve is communicated with a forward oil inlet of the hydraulic motor through a forward oil way, and a forward oil outlet of the hydraulic motor is communicated with a third oil port of the main control valve through a reverse oil way. A fourth oil port of the main control valve is communicated with the oil tank, an oil inlet of the main overflow valve is located on one side of the oil outlet side of the first one-way passage and communicated with the forward rotation oil way, and an oil outlet of the main overflow valve is communicated with the reverse rotation oil way through a second oil way. The oil inlet of theoverflow valve is regulated to be connected with one end of a reversing valve. The other end of the reversing valve is communicated with an oil outlet of the first overflow valve and an oil outlet of the second overflow valve, an oil inlet of the first overflow valve is communicated with a control port of the pressure reducing valve, and an oil inlet of the second overflow valve is communicated with a control port of the main overflow valve. The set value of the second overflow valve is a fixed pressure value higher than the set value of the first overflow valve, so that overflow loss can be reduced.

The invention discloses an electric-hydraulic proportional load-sensitive pump and a pump valve joint control servo system. The electric-hydraulic proportional load-sensitive pump mainly comprises anend cap, a shell, a valve bush, a valve element, a pressure adjusting spring, a push rod, a proportion electro-magnet, a reset spring, a swash plate and a control piston. The work pressure PS of an outlet of the load-sensitive pump keeps constant differential pressure changes along with a load PL, the constant differential pressure can be adjusted through the proportion electro-magnet, the differential pressure adjusting response is fast, and the dynamic response speed of the electric-hydraulic proportional load-sensitive pump can be greatly increased. The pump valve joint control servo systemis free of overflow loss, and the work efficiency of the pump valve joint control servo system can be greatly improved while the high-frequency dynamic characteristic is met.