Road milling machine

Introduction to pavement milling machine products

Road milling machine is one of the main types of asphalt pavement maintenance construction machinery, and one of the main equipment for asphalt concrete pavement maintenance construction. It is mainly used for excavation and renovation of asphalt concrete surface layers such as highways, urban roads, airports, freight yards, etc. It can also be used to clean defects such as road bumps, oil waves, mesh patterns, ruts, etc. It can also be used to excavate road pits and grooves, as well as to roughen cement pavement and mill surface layer irregularities.

Using a road milling machine to mill damaged old pavement layers and then laying new ones is an economical and modern maintenance method. Due to its high work efficiency, simple construction process, easy control of milling depth, convenient and flexible operation, good maneuverability, and the ability to directly recycle milled old materials, it is widely used in urban municipal road and highway maintenance projects.

Characteristics of road milling machine

1Using a milling machine to mill road surfaces can quickly and effectively treat road surface diseases, keeping the road surface flat.

2The road renovation project adopts milling technology to maintain the horizontal elevation of the original road surface. The milling process can remove damaged road surfaces and fill the original space with new materials. After compaction, it can maintain the same height as the original road surface, keeping the original horizontal elevation of the road surface. This ensures that the road surface load passing through elevated bridges or overpasses does not have an impact load on the bridge body, and the height of the bridge remains unchanged.

3Ensure a good combination of new and old pavement materials to improve their service life. The use of milling technology can make the edges and bottom of the filling pit neat and the depth uniform, forming a tooth shaped geometric surface that is easy to combine new and old materials, thereby greatly improving the service life of the renovated new road surface.

4Beneficial for the recycling of old pavement materials. Due to the ability to control the cutting depth, the milled material is not only clean but also in the form of regular small particles, which can be recycled on-site or in fixed material yards without further crushing and processing, greatly reducing construction costs and also serving as an environmental protection measure.

Main structure and working principle of road milling machine

A general milling machine consists of an engine, frame, milling rotor, milling depth adjustment device, hydraulic components, aggregate conveying device, steering system, and braking system.

The milling rotor is the main working component of a milling machine, consisting of a milling rotor shaft, a tool holder, and a tool head. It directly contacts the road surface and works through its high-speed rotating milling cutter to achieve the purpose of milling. The milling machine is equipped with an automatic leveling device, which uses the milling rotor side cover as the milling reference surface to control two positioning hydraulic cylinders to maintain a constant milling depth;

Its hydraulic system is used to drive the rotation of milling rotors, the walking of the whole machine, and the operation of auxiliary devices. It is generally a closed hydraulic system with multiple independent pumps, which does not interfere with each other during operation and has high reliability;

Some milling machines are equipped with tilt adjusters as needed to control the tilt of the rotor; Generally, large milling machines have an aggregate conveying device consisting of a conveyor belt and a collector. It can concentrate the milled bulk materials and transport them to randomly moving transport vehicles. The height of the conveying arm can be adjusted and can swing left and right to adjust the discharge position.

When the specifications and models of milling machines are different, their structures and layouts may also differ slightly, but the basic working principles are the same or similar. The power transmission route of milling machine: engine → hydraulic pump → hydraulic motor, hydraulic cylinder → working device.

Physical picture of pavement milling machine product

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