52results about How to "No throttling loss" patented technology

The invention discloses an excavator negative flow system sensitive to load. The system comprises a hydraulic proportional direction valve, a servo piston, an engine, a variable pump, a metering pump, a first overflow valve, opened-center six way proportional directional valves, cylinders, a plurality of shuttle valves, a solenoid directional valve, a constant difference overflow valve, a throttle, a second overflow valve and the like. The constant difference overflow valve and the shuttle valves are arranged in front of the throttle, the shuttle valves are utilized to obtain the maximum pressure of load and guide to the constant difference overflow valve to control a hydraulic fluid port, and the displacement of the variable pump is maximized before the pressure required to overcome the load is provided at the variable pump outlet, meanwhile, the hydraulic oil return port of the variable pump is sealed, and the pressure required to overcome the load is allowed to be provided at the variable pump outlet rapidly. By the aid of the excavator negative flow system, energy loss of a hydraulic pump can be reduced when a main control valve is in the neutral position, the throttle has no throttling consumption before the pressure required to overcome the load is provided, and energy loss of a hydraulic system is reduced.

The invention relates to a forklift hydraulic system with energy recovery and double-pump oil supply functions. The forklift hydraulic system comprises an oil tank, a first oil pump, a motor, a multiway valve, two lifting oil cylinders, two inclined oil cylinders, a steering oil cylinder, a load sensing steering gear, a second oil pump, a directional control valve and a speed limit valve, wherein the multiway valve consists of an oil inlet and return valve plate assembly, an inclined reversing valve plate and an oil inlet valve plate, and is a plate type multiway valve; a three-position eight-way lifting reversing valve and a first main safety valve are arranged in the oil inlet and return valve plate assembly; the inclined reversing valve plate comprises an inclined three-position six-way reversing valve, a first oil adding overload valve and a second oil adding overload valve; the oil inlet valve plate comprises a split-flow valve, a priority valve, a steering safety valve and a second main safety valve. The forklift hydraulic system is suitable for not only hybrid power forklifts but also electric forklifts. For example, after a 7t electric forklift is charged once, according to the test results of an energy consumption test method of the whole vehicle, the energy consumption of the system is reduced by 25%, and the working cycle time of the whole vehicle is prolonged by 50 minutes.

The embodiment of the invention discloses a hearth negative pressure control method. The hearth negative pressure control method comprises the steps of obtaining a measurement value furnace negative pressure; calculating deviation between the measurement value and a given expected value of furnace negative pressure; when the deviation is judged not to meet a preset allowable deviation range, adjusting the revolving speed of a motor of an induced draft fan till the motor of the induced draft fan operates at expected revolving speed, so as to realize the energy-saving reformation of the induced draft fan. Besides, the invention additionally discloses a hearth negative pressure control system.

A variable displacement plunger pump system for a drilling rig, including an integrated control valve group, a plunger pump, a rotary motor, and an up and down motor, wherein the integrated control valve group is a slice valve, and the one-way regulating valve body, the rotary motor control valve , The upper and lower motor control valves correspond to the corresponding oil hole positions of the one-way pressure reducing valve body, so that the main oil circuit and the control oil circuit are connected, and the valves are connected in series with screws, and then the oil pipe and the pressure limiting flow control valve body are used. Connect, and finally connect with the plunger pump as a whole. The advantages are: the shape is flaky, and the control valve core with various functions and the corresponding oil circuit can be installed inside according to the needs. There is no pipeline connection with the hydraulic system, and the oil return hole of the integrated control valve is directly connected to the oil inlet hole of the plunger pump, which has the function of hydraulic power recovery. The main oil circuit cancels the hydraulic loss components of the overflow valve and the throttle valve, and the drilling rig has good controllability and stability. stability.

The invention discloses a hybrid power hydraulic excavator system adopting movable arm closed control, comprising an internal combustion engine, a multitandem valve bank, a variable displacement hydraulic pump, a generator, an electric energy storage unit, a movable arm control system, a rotation control system, a bucket hydraulic cylinder and a bucket rod hydraulic cylinder, wherein a motor with variable rotation speed is used for driving the hydraulic pump with three oil ports to directly control a movable arm hydraulic cylinder, so that the vertical movement of a movable arm of a hydraulic excavator is realized; the rotation of the upper rotation main body of the hydraulic excavator relative to the lower rotation main body is realized through controlling a rotation motor / generator by the rotation control system; a hybrid power drive mode is adopted, the potential energy of the movable arm and the kinetic energy of rotation can be directly converted into electric energy to be stored in the electric energy storage unit. According to the hybrid power hydraulic excavator system adopting movable arm closed control, the recycle and release of the potential energy of the movable arm are conveniently controlled, and the system has the advantages that the energy efficiency is high, the structure is simplified, the fuel consumption of a whole machine is low, the work efficiency and the energy utilization are high, and the like.