The Working Principle and Operational Instructions of the Dumping Mechanism Controlled by Combinative Electricity-Gas
1. The Working Principles of the Hydraulic System
音 Principle of the power take off system
For the knowledge of the principles of the PTO system, check it back in渊樱冤1尧渊1冤
200
OWNER爷S MANUAL
JAC HEAVY DUTY TRUCK
音 The Hydraulic Principle Diagram of the Dumping System(see Diagram 7)
From the diagram, you can grab the idea that, in the system, the pausing and falling of the carriages are independent of
the working condition of the oil dump. In other words, while the carriages are being paused or bought down, the working
of the oil pump still continues, so that the operation of the mid-parking procedure is simplified. Valve (1) is an air valve;
it relies on the manipulation of valve (2) to direct the high pressure gas, and furthermore, to control the lifting valve, for
the sake of steering the carriages freely. When the carriages reach a certain height, some part of them push open the
limit valve, and the air path gets cut through. Here comes the right occasion to unload the carriages. As for the hydraulic
lifting valve, it functions like this: as valve (1) is on the right, the hydraulic oil, pressurized by the pump, passes through
entrances "P"& "A" down towards the bottom of the tub. At this moment, the carriages are on the lift. In the middle as the
valve is, two kinds of situation account for the pause of the carriages. Firstly, the pressurized hydraulic oil, past the
check valve and the dumping valve, returns to the tank; or, with the PTO turned off, the oil pump quits working. The oth鄄
er kind of condition should be the one in which the hydraulic oil in the tub is blocked. Likewise, two kinds of reasons are
sound for the falling of the carriages. Of them, the first one shares the same nature as the first one just above-men鄄
tioned; and another should be the fact that the oil in the hydraulic tub, by way of entrances "B"& "A", finally retires in the
tank.
201