Application of Milling Machine in Road Milling Project

A road milling bit is one of the mechanized road maintenance equipment, which plays an important role in construction operations. This article analyzes the transmission mode of the walking system of the road milling bit, hoping to play a certain reference role for the equipment selection of road maintenance enterprises and the research and development of technical personnel.

Here is the content list:

l Hydro-mechanical hybrid transmission

l Full hydraulic transmission

Hydro-mechanical hybrid transmission

The milling drum components adopted by the traveling system of domestic road milling bits mainly have the following four types, which are formed by domestic road milling bit manufacturers referring to foreign technology in the 1980s and making improvements.

The first type: engine → transfer case → variable hydraulic pump → quantitative hydraulic motor → two-speed transmission → steering drive axle → solid tires;

The second type: engine → transfer case → variable hydraulic pump → quantitative drive motor → two-speed transmission → steering drive axle → solid tire + hydraulic pump → diverter valve → rear-wheel-drive hydraulic motor → wheel side planetary reducer → solid tire;

The third type: engine → transfer case → variable hydraulic pump → rear-wheel-drive hydraulic motor → wheel planetary reducer → solid tire;

The fourth type: engine → transfer case → variable hydraulic pump → front-wheel-drive hydraulic motor → wheel planetary reducer → solid tires.

Full hydraulic transmission

The power transmission route of the full hydraulic transmission is engine → sub-tank → variable hydraulic pump → diverter valve → hydraulic motor → wheel planetary reducer → solid tire. The milling drum component can drive all wheels individually, and the driving motor is supplied by a variable hydraulic pump. Whether it is during operation or transition, the driving speed can be adjusted from 0 to the maximum speed; hydraulic motors mostly use two-stage high-speed variable motors, and the two-stage variables use electromagnets to switch on or off or hydraulic oil. Achieve two-level control of maximum and minimum displacement, similar to mechanical transmission

The gear shifting transmission can use different gears according to the two different working conditions of the vehicle working and walking. This control method is widely used on construction vehicles. The speed of the vehicle is controlled by the step-less adjustment of the variable hydraulic pump in different gears.

The diverter valve in the hydraulic system can ensure that the variable hydraulic pump provides the same amount of hydraulic oil to each parallel drive motor so that the speed of each drive motor is the same, and the oil in the parallel system will not be due to the poor attachment condition of a certain drive wheel. Flow into the motor, causing it to Overspeed or even damage it. The road milling bit has two positions: open and closed. When the diverter valve is in the open condition, the spool of the directional valve located in the valve body for switching positions is in a relaxed state, and the flow of the main oil circuit is evenly divided to each drive motor, The motors are independent of their respective loads and run at a fixed speed so that the drive wheels are fully synchronized; when the diverter valve is closed, the spool of the reversing valve is in a locked state, and the flow of the main oil circuit can be diverted in any way Enter each drive motor.

Today, the road milling bit has been well developed. And the intelligence of road milling bits is very high, and gradually tends to the unification of international standards. Therefore, different vehicles can integrate different road milling bits from different suppliers. Whether it is a rubber sheet, RUIAN FLY MACHINE PARTS CO., LTD road milling bit is an ideal choice.