Gear pump pressure oil flow into the work system, dual pump confluence. When the machine is in the state of digging up, the working pressure rises sharply, the pressure exceeds the rated value, the hydraulic system overflows under the high pressure, resulting in a great waste of energy, and the hydraulic system oil temperature rises sharply, causing fatal to the whole system The damage. The other is to control the gear pump, the system has three main hydraulic power source. When the loader boom lift state, the switch valve to the left, double pump confluence, flow to the working device increases, in order to enhance the bucket lift speed; if the machine digging, loading state, the control port K Pressure into the switch valve to the right to flow to the work of the device to reduce the amount of oil, part of the switch pump out of hydraulic oil flow back to the tank to reduce the hydraulic load, this part of the power is allocated to the drive wheel to improve the traction. Although such a system can save energy, it is difficult to obtain high working efficiency except for the boom-raising status and is still in a state of high-pressure overflow under excavation, which causes fatal damage to the whole machine. And the system is more complex, the cost increases, the economic efficiency is poor. Pump control combined diversion hydraulic system In order to save energy, reduce costs and reduce oil temperature damage to the hydraulic system, the machine in a highly efficient and reliable operation, and to avoid when the steering or working pressure exceeds the rated value, the entire system Under the high pressure overflow, resulting in a great waste of energy, and hydraulic system, a sharp rise in oil temperature, causing fatal damage to the entire system, invented this hydraulic system, the system low cost, high reliability, Large increase in overall power utilization, and has a high pressure automatic overflow, high temperature automatic cut off confluence, protection system, but also get a greater digging force. The hydraulic system performance of the high-pressure high-flow loader with larger tonnage is improved, so that the power utilization rate is greatly improved. The performance of the machine has greatly improved, and the intelligent control of the machine possible. Controllable dual-pump split-flow hydraulic system Description: The hydraulic system for the valve-controlled split-flow system, there are two main power source for the work pump and gear pump, steering and hydraulic system plus a combined flow control valve, controllable Double pump and shunt valve electromagnetic control valve shown in Figure 4, wherein the solenoid interface and the whole three alarm system. This valve is normally open P-PF, PF and T normally closed valve, PF pressure and the right side of the main spool connected, if the steering system is not working, steering pressure oil from the priority valve controllable dual-pump shunt valve P port into Work hydraulic system PF, double-pump confluence, improve the work efficiency of the whole machine, when the whole machine to dig or overload, the working pressure of the hydraulic system exceeds 18Mpa, and through the throttle role in the valve right, if the force F Above the spring setpoint, the controllable dual-pump diverter spool moves to the left and the P port communicates with the T oil to divert the system to low-pressure relief to prevent the steering system from overflowing under high pressure, reducing power loss and hydraulic oil temperature. If the whole machine is in a state of high-pressure overflow for a long time and the system oil temperature is raised to the set value of the system, the oil temperature sensor will send a signal to the controller and the system will carry out three-level alarm. The controller will issue a signal to E to control the gear oil pump Combined diverter valve electromagnet energized, so that to promote the spool 4 to the right, P port and T port connected to the steering system for low pressure overflow. Gear pump does not confluence, to avoid system oil temperature rise, resulting in system damage.
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