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Knowledge

27

2022-12

Working principle of milling machine

Pavement milling machine is one of the main types of asphalt pavement maintenance and construction machinery. One of the main equipment for asphalt concrete pavement maintenance and construction is mainly used for the excavation and renovation of asphalt concrete surface layers such as highways, urban roads, airports, freight yards, etc. It can also be used to remove defects such as pavement embossment, oil waves, mesh patterns, rutting, etc. It can also be used to excavate potholes and grooves on the pavement, and milling of cement pavement. Milling the damaged old pavement with a road milling machine, and then laying a new surface layer is one of the most economical modern maintenance methods. Because of its high efficiency, simple construction process, easy control of milling depth, convenient and flexible operation, good mobility, milling of old materials can be directly recycled, etc., it is widely used in urban municipal roads and highway maintenance projects. Main structure and working principle 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 cutter seat and the cutter head. It directly contacts with the road 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 side cover of the milling rotor as the milling reference surface and controls 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 walk, auxiliary device work, 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 when working. Some milling machines are equipped with inclination adjusters as required to control the inclination of the rotor. Generally, large milling machines have an aggregate conveying device composed of a conveyor belt and a collector, which can concentrate and transfer the milled bulk material to a random walking vehicle. The height of the conveying arm can be adjusted and can swing left and right to adjust the unloading position. When the specifications and models of the milling machine are different, their structure and layout are slightly different, but the basic working principle is the same or similar. The route of power transmission of milling machine: engine → hydraulic pump → hydraulic motor, hydraulic cylinder → working device.

2022-12-27

27

2022-12

What problems should be paid attention to when using the trowel?

If you want to make good use of the polishing machine, you must understand the blade, its quality is directly related to the effect of concrete polishing. Spreading machine spatula often use friction with the concrete surface, after a period of time will inevitably produce wear, so the general use of a period of time to replace the blade. When we choose, we must first look at the material of the blade. If the material is too soft, it will easily deform during use, which will cause unevenness. So we must choose those materials with high rigidity. And to choose those materials wear-resistant blades, because the friction of concrete is large, if the blade is not wear-resistant, it will cause the blade to be damaged if it is not used for a long time. It is also necessary to ensure that the size of the blade is basically the same, and the balance must be maintained when rotating. Scrub machine operation matters needing attention: 1. Before use, check whether the motor, electrical switch, cable and wiring are normal and meet the requirements, and install the leakage protector. 2. Check and clean up the debris on the smearing tray before use to avoid the whole machine beating during use. 3. After the power is turned on, the test run shall be carried out. The blades shall rotate clockwise and shall not be reversed. 4, the operator should wear insulating shoes, wear insulating gloves, cable by the auxiliary personnel, auxiliary personnel should also wear insulating shoes and wear insulating gloves. Take care to prevent electric shock caused by the insulation of the cable. 5. If the polishing machine fails, it must be shut down and cut off the power supply before maintenance. 6. The finishing machine should be stored in a dry, clean and non-corrosive gas environment, the handle should be placed in the specified position, and rough loading and unloading should not be allowed during transfer. No matter what kind of finishing machine, we must pay attention to these operational matters, to ensure construction safety, reduce unnecessary wear and tear. The construction speed is faster and the operation is more convenient. The important thing is that the ground effect is more uniform, smooth and beautiful.

2022-12-27

26

2022-12

Why is it necessary to clean the grinding discs after curing and repairing with a floor grinder?

During floor grinding operations, it’s essential to thoroughly clean the worn-down grinding discs after each pass. This prevents sand and grit trapped inside the discs from causing irreparable scratches on the floor during subsequent work—especially critical when applying curing treatments. After repairing the surface, be sure to promptly remove any residual repair compounds or materials from the discs, as leaving them behind can make cleanup extremely difficult once they’ve dried completely. As a dust-free construction technique specifically designed for curing floor applications, this method requires careful attention. If you’re using the “grinding method” to apply repair agents or mortar, the discs will inevitably pick up these materials during the process. Failing to clean them promptly could lead to damage that might be impossible to fix—or at the very least, require significant time and effort to restore, adding unnecessary stress to your flooring project. Therefore, always remember to inspect and clean the metal grinding discs after completing the curing and repair stages, particularly when employing the grinding technique. For high-quality, dust-free floor grinding solutions tailored to your needs, consider the Metengqi grinders manufactured by Guangzhou Qingqinyu Environmental Technology Co., Ltd. We’d be delighted to assist you—feel free to reach out for more information! **Contact:** Ms. Wu **Tel:** +86 020 38989152 **Mobile:** +86 13925069066 **Fax:** +86 020 38989166

2022-12-26

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