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At present, the annual output of construction waste in China is 1.55-2.4 billion tons. Large-scale old city reconstruction and accelerated urbanization will make China's construction waste output reach a peak in the next few years. Construction waste treatment and reuse is a way to solve the siege of urban construction waste with both economic and social benefits.
Portable crusher plant is commonly used equipment to process construction waste.
Portable crusher plant is constituted by crusher, screening system, debris sorting device, transport mechanism, and vibration feeder. Also, the action mechanism is configured to make the whole production line moving.
Vibrating feeder is generally set before crusher and its greatest advantage is to be able to feed the raw materials uniformly and also can pre-screen the raw material.
In portable crusher plant, crusher is the core component and the crushing process of raw material is its main task. The crusher crushes raw material into small particles sizes. And the shape of the final products should be granular and the content of needle-like particles should be low and the particle grade distribution should be uniform. So, there are specific requirements about the crushing capacity, efficiency and qualities of final products.
The screening system re-screens the larger particles after primary crushing, and conveys them to the crusher for secondary crushing, to ensure the quality of the finished products meet customer needs.
The portable crusher plant is often used for crushing construction waste. There will be waste steel bars, wires and some other impurities that cannot be crushed in the construction waste. Therefore, it is necessary to have a sorting device to sort the material to avoid affecting the work of the crusher or the quality of finished product.
Wheeled and crawler walking mechanisms are two important walking organizations in portable crusher plant. Wheeled walking mechanisms are facilitated on ordinary highways, small turn radius, can be quickly stationed in the construction site, high flexibility, saving time. The crawler walking mechanism can walk smoothly, with lower grounding ratio, which can effectively adapt to wetlands and mountainous environment. It is usually used to apply a full hydraulic drive system, which is highly reliable and has large driving force.
According to the walking method, portable crusher plant can be divided into wheeled portable crusher plant and crawler portable crusher plant. They have the following similarities and differences:
Both are portable crusher plants, and the wheeled type and crawler type have common characteristics, such as:
1, flexible, saves a lot of time
Portable crusher plant can reach the mining site directly, not affected by the change of the site. After completing the station adjustment in a short time, portable crusher plant can start the operation. Because of the small size of the equipment, portable crusher plant is especially suitable for the narrow crushing site. At the same time, it eliminates the tedious steel frame structure, eliminates the need for foundation construction and saves a lot of time.
2, integrated complete unit
The integrated unit equipment installation form, eliminating the complicated site infrastructure installation operation of separate components, reduce the consumption of materials, labor hours, is a collection of materials feeding, crushing, conveying and other process equipment as one of the production line. The reasonable and compact space layout of the unit improves the flexibility of the site.
3, reduce material transportation costs
The portable crusher plant can work on site without having to move the material from the site and reducing the transportation cost of the material.
4, flexible combination, complete functions
According to the actual production requirements of the user, the corresponding equipment is equipped, and a variety of combinations can be composed of "crushing before screening ", and it can also form a "screening before crushing" process, which can be combined into a two stage crushing-screening system with coarse crushing and fine crushing and can also be combined into a three stage crushing-screening system with coarse crushing, medium crushing and fine crushing or run independently, with great flexibility.
In addition to the above common characteristics, they also have their own unique advantages; we compare them from the following aspects:
1, driven force
In fact, the wheeled portable crusher plant cannot be completely called mobile crusher, because its transition movement is to rely on the semi-trailer traction, so its driven force is not as good as self-hydraulic driven crawler portable crusher plant.
2, applicable site
Because the wheel type portable crusher plant adopts vehicle-mounted traction, it is more suitable for the crushing of construction waste and various sand and stone materials in, earthwork, urban infrastructure and road construction, building and other industries.
The chassis of crawler portable crusher plant adopts a crawler-type fully rigid ship structure, which has high strength, low grounding ratio, good passability, and has good adaptability to mountains and wetlands, and can even achieve climbing operations, so it is mostly used in some mining, open-pit coal mining and other harsh operating environment. However, because of its convenient and fast movement, it is also commonly used for the crushing and processing of urban construction waste.
3, work efficiency
When wheeled portable crusher plant works, because the hydraulic outriggers under the frame are fixed, the stability of the whole station is increased. Stability is the basis of the portable crusher plant. Good stability allows the whole station to be equipped with large crushing equipment, that is to say, the wheeled mobile crushing station can carry out the crushing operation of large-sized materials, and the work efficiency is extremely high.
The stability of crawler portable crusher plant is weak, which in turn leads to its crushing capacity is not as efficient as that of wheeled portable crusher plant.
4, equipment performance
The wheeled portable crusher plant has a short wheelbase and a small turning radius, which does not damage the road surface and can run flexibly on the ordinary highway and working areas.
Crawler portable crusher plant uses crawler walking, which can realize in-situ steering, standard configuration, through wireless remote control, it is easy to drive the crusher to the trailer, and transport it to the working site.
5, effect of final products
At present, portable crusher plant is used in the crushing treatment of construction waste, and the recycled aggregate has a good shape, which is beneficial to recycling. The semi-open discharging system is suitable for crushing construction waste containing a small amount of steel bars, with fine discharging, less over-crushing, and good particle formation.
Generally speaking, the price of crawler type portable crusher plant is relatively more expensive than that of the same series of wheeled type portable crusher plant.
Using portable crusher plant to deal with construction waste has the following ten advantages:
1. The portable crusher plant is a complete set of equipment that has been manufactured by the manufacturer. It does not need to be installed on site and can be used after power on.
2. The main machine of the crushing station can be switched freely, which can meet the different needs of different customers, realize a machine with multiple functions, the operation and process are more flexible and convenient.
3. The length of portable crusher plant is short, different crushing equipment is installed on independent movable chassis, with short wheelbase and small turning radius, which can drive flexibly in ordinary roads and working areas.
4. The portable crusher plant can directly crush the construction waste on site without having to move the construction waste away from the site for further processing, which greatly reduces the transportation cost of materials.
5. It adopts two modes of oil and electric, which is convenient for field operation, and can move flexibly. It can walk by itself, and adopts remote control or manual driving.
6. According to the actual production requirements of the user, the corresponding equipment is equipped, and a variety of combinations can be composed of "crushing before screening ", and it can also form a "screening before crushing" process, which can be combined into a two stage crushing-screening system with coarse crushing and fine crushing and can also be combined into a three stage crushing-screening system with coarse crushing, medium crushing and fine crushing or run independently, with great flexibility.
7. Mature design scheme, create a green, pollution-free crushing environment.
Adopt new centralized lubrication system and unified maintenance toolbox design, make maintenance is more convenient, can save a lot of labor and time.
8. After being crushed, construction waste can be recycled, turning waste into treasure, reducing construction waste costs, while also saving energy for the country. It is in line with the sustainable development strategy advocated by the country and belongs to a healthy and green industry.
9. Environmentally friendly
10. Low investment pressure.
11. Single machine can save more than 60% energy.
12. Adopt new centralized lubrication system and unified maintenance toolbox design, make maintenance is more convenient, can save a lot of labor and time.
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