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

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 relates to a fixed delivery and variable delivery hydraulic system of a mining dump truck. A hydraulic steering system in the fixed delivery and variable delivery hydraulic system of the mining dump truck comprises a steering oil cylinder, a load-sensitive variable pump, a steering gear, a signal control valve, a shuttle valve and a flow control valve, wherein the steering gear is connected with the steering oil cylinder. A control oil path of a pilot valve is simultaneously communicated with a signal port P1 of the signal control valve and a left end signal port of the flow control valve. A left position oil outlet of the flow control valve is in one-way communication with a port P of a hydraulic control lift valve through a check valve, a right position oil outlet of the flow control valve is connected with a port P of the steering gear, and an oil inlet of the flow control valve is connected with the pump opening of the load-sensitive variable pump. The pump opening of the load-sensitive variable pump is connected with a port P2 of the signal control valve, a port P3 of the signal control valve is connected with a valve LS in the load-sensitive variable pump, and a port LS of the signal control valve is connected with a port LS of the steering gear. The fixed delivery and variable delivery hydraulic system of the mining dump truck is stable in working and simple in structure, and reduces energy consumption.

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 belongs to the technical field of hydraulic energy-saving equipment, and relates to an intelligent ultra-low speed stepless speed regulating hydraulic energy-saving fan. Fan blades are mounted on a variable displacement motor, a mesh enclosure covers the fan blades, and the variable displacement motor is mounted on a base supporting system. A hydraulic system is connected with a control system which is provided with a wireless network interface and a wired network interface, and a variable pump is connected with a variable motor. A first one-way valve and a second one-way valve are in series connection and then are connected with the variable pump. An oil replenishing pump and a safety valve are both connected with an oil tank, and an overflow valve is connected with the oil tank. The motor is connected with the overflow valve and a fixed pressure reducing valve respectively, and a throttling valve is arranged between the fixed pressure reducing valve and the oil tank. A sensor and an operation display are both connected with the control system, a wireless remote control receiving unit is arranged at the bottom of a base supporting system, and the wireless remote control receiving unit and a wireless remote control sending unit constitute a wireless remote control unit. The intelligent ultra-low speed stepless speed regulating hydraulic energy-saving fan is simple in structure, scientific in principle, safe and reliable to use, little in energy consumption, good in energy-saving effect, low in cost, short in manufacturing cycle, and high in production efficiency.