In order to correctly select the milling machine, in addition to understanding the technical parameters and performance characteristics of the milling machine of domestic and foreign manufacturers, we should also turn over the following aspects when selecting the milling machine.
1. Engineering projects and materials
According to the engineering project and engineering materials, the milling machine can be roughly selected. For large-scale construction projects, milling machines with a milling width of 2m and above and a high degree of automation should be used. This can be used in conjunction with maintenance machinery to better reflect the advantages of modern operations and save a lot of manpower and material resources. For general turning maintenance and municipal engineering, a small milling machine with a milling width of 0.5 to 1.3 m should be used, which can make the operation simple and convenient, and can fully meet the construction requirements.
2. Milling machine performance requirements
The selected milling machine should also make clear requirements in the following aspects, and some projects must have certain quantitative indicators.
(1) Power performance. The engine of the milling machine should have sufficient overload capacity (power and torque) to ensure that it can rely on its own power to complete the milling work and the necessary site shifting at full load to adapt to the increase in smoke resistance. The unevenness brought by the big. (2) Work reliability. The reliability of the milling machine depends on the manufacturer's technical strength and the quality of the components, as well as the maintainability of the milling machine itself. Equipment with high reliability has the characteristics of low early failure rate, fast fault repair speed and long overhaul interval of the machine. (3) Environmental adaptability. According to the needs of the project, the climate adaptation conditions of the milling machine should be selected. For example, to prevent engine deflagration in high temperature areas, to make the engine easy to start in low temperature areas, to prevent corrosion of components in humid areas, and to prevent cooling water in cold and dry areas. Evaporation is fast, and the area of ​​the plateau anoxic should prevent problems such as engine power drop. (4) Safety and comfort. The milling machine should have a good view and operation space. The driver should observe the outer edge of the milling and the working condition of the conveyor belt from both front and rear directions. Anti-rollover safety protection devices can also be added to impose strict requirements on the vibration reduction, sound insulation, dust removal, steering, braking and flexible operation of the milling machine. (5) Human-machine exchange function. The less the control part of the milling machine, the better, the simpler the better. It is necessary to install the necessary indicating instruments, and an automatic alarm system should be provided for some faults. It is even necessary to add an intelligent control system to achieve automatic control. (6) Appearance requirements. Provision is made for the appearance, paint color, sealing and packaging and transportation of the milling machine. (7) Environmental protection requirements. The milling machine should not have leakage problems such as oil, water and electricity. The noise and smoke exhaustion of the machine should be within the specified range.
3 Milling machine parts assembly
The configuration of the whole machine shall be subject to the construction conditions and appropriate economic endurance. The necessary items shall be indicated in the purchase contract.
(1) Engine. Choose whether the engine cooling method is water-cooled or air-cooled. The product brand or manufacturer has emission standards in accordance with TIER1 or TIER2 to meet the construction environment. The air filter should be easy to clean and replace. The installation of the intake and exhaust pipes can not hinder the driver's line of sight. The engine hood is easy to open and easy to repair (2) working device. The drive system is determined to be in the form of full hydraulic, mechanical or tracked, wheeled; milling wheel diameter and milling depth, indicating whether the working direction of the milling wheel is up-cut or down-cut. The tool holder system should be assembled as a standard part, easy to replace at any time, the tool head can be quickly replaced, and the sprinkler and reclaimed material conveying device that meets the needs of the construction project should be prepared. (3) Transmission system. Clearly indicate whether to use mechanical transmission, hydraulic transmission, or hydraulic + mechanical transmission, in order to make the machine have good passability, in addition, the machine must have two speeds of driving and working to adapt to various working environments, Quickly transfer worksites, etc. (4) Brake system. A brake with sufficient capacity must be provided to determine the way the service brake is applied and the way the emergency brake is controlled. It can also be matched to an automatic protection system that automatically brakes when the hydraulic system pressure drops. (5) Hydraulic system. Milling machines should have separate walking and steering hydraulic systems with good hydraulic oil filtration and cooling performance. (6) Control system. The milling machine should have a simple and convenient operation control system. Even a highly automated control system should be easy to operate, avoiding increased costs and maintenance costs. (7) Electrical system. The milling machine should be equipped with reliable electrical components and connectors. With fault diagnosis, fault alarm and maintenance tips, it can intuitively read various data and obtain the state parameters of various devices under the working state of the milling machine.
4. Milling thickness and mechanization
Usually road maintenance and road roller construction depends largely on the asphalt mixture and the thickness of the cement layer. The high-grade highway has strict requirements on the bearing capacity, surface wear resistance and surface compactness. The thickness of the repair layer is generally about 200-300mm. The milling machine with a milling depth of 200mm or more should be selected and appropriate. Consider the milling width; if you are a small-scale project, you can use a small milling machine with a milling depth of about 150mm, and use a milling machine with a relatively simple and easy-to-operate milling machine.
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