Milling machine is one of the main types of construction machinery for asphalt pavement maintenance. It is mainly used for clearing congestion, oil waves, netting, rutting, etc. of asphalt concrete surfaces such as highways and urban roads. This article focuses on the classification, application occasions and uses of the milling machine.
1. Classification of milling machine
According to the milling form, the milling machine can be divided into cold milling type and hot milling type. The configuration of the cold milling type is larger, the tool wears faster, the cutting material has a uniform particle size, and the sprinkler device can be set to spray water. It is widely used and the 名媛直播 are in series; the hot milling type has a more complicated structure due to the addition of the heating device and is generally used Road regeneration operations.
According to the rotation direction of the milling rotor, it can be divided into two types: down milling and up milling. The direction of rotation of the rotor is the same as the direction of rotation of the wheel when the milling machine is running.
According to the structural characteristics, it is divided into two types: wheel type and track type. The wheel type has good maneuverability and convenient transition, and is especially suitable for small and medium-sized road operations; the crawler type is mostly a large milling machine with a milling width of more than 2000mm.
There is an old material recycling device, which is suitable for large-area road regeneration projects.
According to the position of the milling rotor, it can be divided into rear suspension type, intermediate suspension type and coaxial type with the rear axle. The rear suspension type milling rotor is suspended at the rear of the rear axle; the intermediate suspension type milling rotor is between the front and rear axles; the rear axle coaxial type milling rotor is coaxially arranged with the rear axle.
According to the working width of the milling rotor, it can be divided into three types: small, medium and large. The milling width of the small milling machine is 300~800mm, and the transmission method of the milling rotor is mostly mechanical, which is mainly suitable for road maintenance works with a construction area of less than 100M2; the milling width of the medium-sized milling machine is 1000~2000mm, and the drive of the milling rotor Most of the methods are hydraulic; the milling width of large milling machines is more than 2000mm, and they are generally used in conjunction with other machinery to form a complete set of road regeneration repair equipment. The milling rotor transmission method is also mostly hydraulic.
According to the transmission mode, it is divided into two types: mechanical and hydraulic. Reliable mechanical work, convenient maintenance, high transmission efficiency, low manufacturing cost, but its complex structure, not easy to operate, low operating efficiency, low traction force, suitable for small-scale pavement maintenance operations with shallow cutting; compact hydraulic structure , Lightweight operation, flexible maneuverability, large traction, but high manufacturing cost, difficult maintenance, suitable for deep and medium-scale and large-scale pavement maintenance operations.
Second, the use of milling machine
1. The surface of the bridge deck is treated with water-repellent chiseling, and the beam surface of the high-speed railway box girder is flat and waterproof.
2. Asphalt pavement flooding, rutting, network cracks, and milling of pits and grooves are removed. Remove ice and snow from bridge decks and pavements.
3. Before the new asphalt concrete is paved, lightly roughen the original old road surface, or cooperate with a large milling machine to complete the milling and roughening operations in the corner area and the densely packed steel area.
4. Remove the ground coating, paint, and various traffic markings; when the ground is damaged or the dirt needs to be renovated, remove the old floor surface, etc.
5. Clear airport road markings, runway tire braking marks, etc., and regain rough surfaces with high friction coefficients.
6. Milling and leveling the cement asphalt pavement, highway bridge deck, bridge stagger, and epoxy resin wear-resistant ground over-high parts
7. Construction at the micro-surface of the road, milling and removing the original old pavement surface layer to prepare for slurry seal layer
