Common asphalt mixing plant failures

At a time when the Chinese state is strongly supporting infrastructure and road projects, domestic high-grade highway pavement construction projects are in full swing. The smooth development of these projects is inseparable from the asphalt concrete mixing station. It is the key equipment to ensure construction quality and improve efficiency. The efficiency of the asphalt mixing plant and the quality of the finished materials are closely related to the quality of the asphalt concrete mixing plant, whether there is a failure, the type and probability of failure. Regarding the quality of asphalt mixing plants, the editor believes that reliable brands should be selected comprehensively and not just based on price. As for problems such as equipment failures, our company combines many years of project experience to analyze the causes of failures in asphalt concrete mixing plants, which are summarized as follows:

1. The oil-stone ratio is unstable

The whetstone ratio refers to the ratio of the quality of asphalt to the quality of filling materials such as sand in asphalt concrete. It is the most important indicator for controlling the quality of asphalt concrete. If the oil-stone ratio is too large, "oil cake" will appear on the road surface after paving and rolling. If the oil-stone ratio is too small, the concrete material will diverge and the concrete will not be formed after rolling. These are all serious quality accidents. The main reasons are:

(1) The soil/dust content in the sand and gravel aggregate seriously exceeds the standard

Although the dust has been removed, the mud content in the filler is too large, and most of the asphalt is combined with the filler, commonly known as "oil absorption". There is less asphalt adhering to the surface of the gravel, making it difficult to form by rolling.

(2) Metering system failure

The main reason is that the zero point of the measurement system of the asphalt weighing scale and the mineral powder weighing scale drifts, causing measurement errors. Especially for asphalt measuring scales, an error of 1kg will seriously affect the oil-stone ratio. In production, the measurement system must be calibrated frequently. In actual production, due to the large amount of impurities contained in the mineral powder, the door of the mineral powder measurement bin is often not closed tightly, resulting in leakage, which seriously affects the quality of asphalt concrete.

2. Heavy dust, polluting the construction environment

During construction, some mixing plants are filled with dust, seriously polluting the environment and affecting the health of workers. The main reasons are:

(1) The mud/dust content in the sand and gravel aggregate is too large and seriously exceeds the standard.

(2) Dust removal system failure

Asphalt mixing plants currently generally use bag dust collectors, which are made of special materials with small pores, good air permeability, and high temperature resistance. They have good dust removal effects and can meet environmental protection requirements. However, they have one disadvantage: they are expensive. In order to save money, some units do not replace the dust bag in time after it is damaged. The bag is seriously damaged, the fuel is not burned completely, and impurities are adsorbed on the surface of the bag, causing blockage and causing dust at the production site.

3. Maintenance of asphalt concrete mixing station

The maintenance of asphalt concrete mixing plants is generally divided into tank maintenance, winch system maintenance and adjustment, stroke limiter adjustment and maintenance, wire rope and pulley maintenance, lifting hopper maintenance, track and track bracket maintenance, etc. wait.

At the construction site, the concrete mixing station is a piece of equipment that is prone to failure. We must strengthen the maintenance of the equipment. This will help ensure safe construction at the construction site, improve the equipment integrity rate, reduce equipment failures, ensure the quality of concrete, and improve the equipment. production capacity and achieve double harvest of social and economic benefits.