Road milling, Applications and Working principle
Road milling machine is one of the main types of machinery for asphalt pavement maintenance and construction, and one of the main equipment for asphalt concrete pavement maintenance and construction. It is mainly used for excavation and renovation of asphalt concrete surface layers in highways, urban roads, airports, freight yards, etc. It can also be used to remove road surface defects such as bulges, oil waves, reticulation, rutting, etc. It can also be used to excavate road potholes and grooves, as well as roughen cement pavement and mill out surface misalignment.
Main Applications
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- Waterproofing and roughening of bridge decks, smoothing and waterproofing of high-speed railway box girders.
2. Milling and removing bumps, rutting, cracks, and potholes on asphalt pavement. Removing ice and snow from bridge decks and pavement.
3. Slightly roughening the original old pavement before paving new asphalt concrete, or cooperating with large milling machines to complete milling and roughening operations in corner areas and areas with dense steel bars.
4. Removing ground coatings, paint, and various traffic markings; when the ground is damaged and dirty and needs to be renovated, remove the old floor surface, etc.
5. Remove airport road markings, tire braking marks on runways, etc., to regain a rough surface with a high friction coefficient.
6. Milling and leveling of over-standard high parts of cement asphalt pavements, highway bridge decks, bridge misalignments, and epoxy resin wear-resistant floors
7. Road micro-surfacing construction, milling and removing the original old pavement surface to prepare for slurry seals
Working principle
Main structure and working principle Generally, the milling machine consists of an engine, a frame, a milling rotor, a milling depth adjustment device, a hydraulic component, a material collection conveying device, a steering system and a braking system. The milling rotor is the main working part of the milling machine. It consists of a milling rotor shaft, a cutter seat and a cutter head. It is in direct contact with the road surface and achieves the purpose of milling through its high-speed rotating milling cutter. The milling machine is equipped with an automatic leveling device, which uses the milling rotor side cover as the milling reference surface to control the two positioning hydraulic cylinders to keep the given milling depth constant; its hydraulic system is used to drive the milling rotor to rotate, the whole machine to move, and the auxiliary device to work. It is generally a closed hydraulic system with multiple pumps that are independent of each other. It does not interfere with each other during operation and has high reliability; some milling machines are equipped with a tilt adjuster as needed to control the inclination of the rotor; generally, large milling machines have a material collection conveying device composed of a conveyor belt and a material collector, which can collect and convey the milled bulk materials to the randomly moving carrier vehicle. The height of the conveying arm can be adjusted and can swing left and right to adjust the unloading position. The structure and layout of milling machines vary slightly depending on the specifications and models, but the basic working principles are the same or similar. The power transmission route of the milling machine is: engine → hydraulic pump → hydraulic motor, hydraulic cylinder → working device
