Milling machine is a common pavement maintenance construction machinery, is the most economical modern maintenance method, widely used in urban municipal roads and highway maintenance projects. So do you know its application characteristics, structure and working principle? Let's understand together.
1. Application characteristics of milling machine
1. Milling the pavement with a milling machine can quickly and effectively deal with pavement diseases and keep the pavement smooth.
2. The milling process can be used in the road renovation project to maintain the original level of the road surface. The milling process can remove the damaged pavement and fill the original space with new materials. After compaction, it is equal to the original pavement to maintain the original horizontal elevation of the pavement. This makes the pavement load passing through the viaduct or overpass bridge culvert not to the bridge Impact load is generated and the height of the bridge and culvert is unchanged.
3. To ensure a good combination of new and old pavement materials and to increase its service life. The milling process can make the sides and bottom of the filling pit neat and uniform in depth, forming a toothed geometric surface that is easy to combine new and old materials, thereby greatly improving the service life of the new road surface after renovation.
4. It is beneficial to the recycling of old pavement materials. Since the cutting depth can be mastered, the milled material is not only clean and regular small particles, but also can be used to cover the site or fixed material yard without recycling, which greatly reduces the construction cost and is also an environmental protection measure.
2. The main structure and working principle of the milling machine
The general milling machine is composed of 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 part of the milling machine. It is composed of the milling rotor shaft, the tool holder and the tool head, etc. It directly contacts the road surface and works by its high-speed rotating milling cutter to achieve the purpose of milling. The milling machine is equipped with an automatic leveling device, the milling rotor side cover is used as the milling reference surface, and the two positioning hydraulic cylinders are controlled to keep the given milling depth constant;
The hydraulic system is used to drive the rotation of the milling rotor, the whole machine walks, the work of auxiliary devices, etc. It is generally a closed hydraulic system with multiple pumps independent of each other, which does not interfere with each other and has high reliability;
Some milling machines are equipped with tilt adjusters as needed to control the inclination of the rotor. Generally, large milling machines have an aggregate conveying device composed of a conveyor belt and an aggregate, which can concentrate the milled bulk material The height of the conveying arm can be adjusted and can be swung left and right to adjust the unloading position.
When the specifications and models of the milling machine are different, the structure and arrangement are also slightly different, but the basic working principles are the same or similar. The power transmission route of the milling machine: engine → hydraulic pump → hydraulic motor, hydraulic cylinder → working device.
