In sand and gravel production, sand washer is an essential equipment, it is the washing equipment of sand and gravel, which includes artificial sand and natural sand. Sand washer is widely used in sand and gravel quarries, mining, building materials, transportation, chemical industry, water conservancy and hydropower, concrete mixing station and other industries to wash and select materials. It can remove the impurities covering the surface of sand and gravel, and at the same time destroy the water vapor layer covering the sand particles for dewatering, it plays an efficient washing and cleaning role and improve the quality of the sand.
1. Working principle
A. Wheel sand washer working principle
Wheel sand washer is the washing equipment for artificial sand, also including natural sand. It is widely used in sand and gravel quarries, mining, building materials, transportation, chemical industry, water conservancy and hydropower, concrete mixing station and other industries for washing and selecting materials.
Sand washer or sand washing machine is a kind of sand washing equipment, it is normally used with sand making machine for a sand making plant. Wheel sand washer can wash the mixed sand made by sand making machine to remove trace amount of stone powder and impurities, so as to improve the quality of sand. The wheel sand washer is mainly used for washing, grading and dewatering of sand for construction sites, sand and gravel plants, hydropower station concrete dam sites, etc.
When the wheel sand washer is working, the motor drives the impeller slowly through the v-belt, reducer and gears, and the sand and gravel enters the washing tank through the feeding trough, tumbles under the impeller and grinds each other to remove the impurities covering the surface of the sand and gravel, and at the same time destroys the water vapor layer covering the sand and gravel for dewatering. At the same time, water is added to form a strong water flow, which will take away the impurities with small specific gravity in time, and discharge from the overflow outlet washing tank to complete the cleaning action. The clean sand and gravel is taken away by the wheels, and finally the sand and gravel is poured into the discharge tank from the rotating impeller to complete the cleaning action of the sand and gravel.
B. Screw sand washer working principle
Screw sand washer or spiral sand washer is to use the principle of different material particle size and density has different settling speed in the fluid, namely smaller particle size and density settling speed is slow, while larger particle size and density settling speed is faster. This characteristics and principle separates dust and powder from the sand and gravels. Under the steadily rotation and stirring of spiral plates, it achieves the aim of removing impurities, filtering, lifting and conveying.
2. Sand washer features
A. Wheel sand washer features
1. Wheel bucket sand washer has simple structures, the drive bearings are isolated from water and wet materials, this design avoid the occurrence of bearing damage caused by water immersion, greatly reduce the accident rate.
2. Fine sand and power loss is little, the washed sand can meet high standards of construction use.
3. Almost no wearing parts except for the mesh, long term stable operation with little maintenance.
4. Save water resources, high washing degree.
5. Working noise is low, it meets the national environmental protection standards.
6. Low investment, large processing capacity, low power consumption, effectively saving production cost.
B. Screw sand washer features
Screw sand washer is divided into single screw sand washing machine and twin screw sand washing machine, which is mainly used for sand and gravel washing, grading, removing impurities in highway, hydropower, construction and other industries.
The screw sand washer is characterized by long spiral body, special type seal design, simple structure, large processing capacity, convenient maintenance and parts replacement, low water content and mud content of the sand output. It also has small power consumption and high washing degree. Good sealing structure, fully enclosed transmission device and adjustable weir plate ensure high efficiency, durability, good cleaning and dewatering effect, and stable fine-grained products.
Wheel sand washer has simple structure, few wearing parts, need little space for installation. The wheel drive bearing device is isolated from water and wet materials, which basically avoids the phenomenon of bearing damage caused by water, sand and pollutants and greatly reduces the failure rate.
Screw sand washer has a narrower figure and adopts a horizontal structure, which is simple and straightforward, but its installation arrangement is not as convenient as the wheel sand washer
4. Loss of sand during washing
For wheel sand washer, the water consumption in the sand washing process is less, and the loss of fine sand and stone powder is small, the cleaned sand gradation and fineness modulus can meet the construction standards for sand.
While screw sand washer has higher loss of fine sand in the washing process, that’s why the sand after washing looks cleaner.
5. Washing capability
Screw sand washer has powerful cleaning capacity, which can effectively clean sand and gravel with serious muddy impurities, and is often configured in large sand production lines.
While the capacity of wheel sand washer is generally below 100 tons, so it is suitable for small and medium capacity sand production line system.
6. Sand washer price
The price of wheel sand washer is relatively low, it belongs to the economic type of high-efficiency sand washing equipment, and its operating cost is also low.
The price of the screw sand washer is relatively high, it belongs to the high-grade type of sand washing equipment with large output.
7. Singe and twin washers for option
Wheel sand washer can freely choose to increase the number of sand washing wheel according to the sand and gravel situation, so this equipment has single impeller and double impellers sand washer for option. It can also install a fine sand recovery device on the side of the equipment, it is convenient to achieve this.
If the sand and gravel material soil or powder content is high, or if want to increase the process capacity, the screw sand washer can also increase the length of the equipment, there is also tin screws for option. Both singe screw and twin screw sand washers are available in Deya Machinery.
Generally speaking, it may be because the wheel sand washer is relatively cheap in price, and its processing capacity is not as good as the screw sand washer, but it can already meet the requirements of most sand washing production lines, so the choice of wheel sand washer users may be more, the application range is also relatively wide. In the actual production has seen a lot of wheel sand washing machine, its multi-point preference is understandable.
However, the user should consider the composition of sand and gravel, the expected capacity, production site conditions and other factors when choosing equipment, both sand washing machine equipment have their own characteristics, choose the most suitable one to meet the production requirements in order to obtain better economic benefits.