Two Ways to Control the Air Quantity of Draught Fan

(1) the working principle of adjusting the air quantity of the draught fan of industrial drying machine: when the draught fan is working in the ventilation network, the actual air volume is equal to the flow of air in the ventilation network and the pressure is equal to the resistance of the ventilation network. The fan performance curve depicts the variation of the air flow and pressure of the fan. The ventilation network characteristic refers to the relationship between the air flow and the resistance of the ventilation network.

When the drying equipment is used to dry the materials, the working conditions of the draught fan need to be adjusted according to production requirements, namely, to change the location of the operating point of the fan to make the output of the air volume keep balance with the actual needs of the air volume. The following is the two ways to control the air quantity.
the throttle regulation: it means that the throttle valve should be installed in the exhaust pipe of the fan in the industrial dryer. According to actual needs, changing the opening degree of the throttle valve will change the characteristics of the pipe to regulate air flow.
(2) the adjustment of the rotational speed: as for the fan itself, it is more economical without additional energy loss when changing the rotational speed of the draught fan. However, it is necessary to use the motor to adjust the speed when changing the fan speed, which will need to add speed control device. In addition, the greater the power of the motor is, the higher the cost will be.

Milling Equipment

Main structure
The milling equipment is mainly composed of the host, analyzer, blower, cyclone separator and other parts. Milling equipment is mainly applied in the sectors of building materials, chemicals, fertilizer, metallurgy, mining, refractory, ceramic, steel, thermal power, coal and other industries for the grinding of the materials whose Mohs hardness is below 9 and humidity is less than 6%. The fineness of the finished product can be adjusted from 30 mesh to 400 mesh.

Working principle
When the grinding mill is in operation, the materials to be pulverized will be sent to the machine from the side of the casing and the materials will revolve around the vertical axis by relying on the roller device hanging on the rack. Due to the centrifugal force generated by the rotation, the grinding rollers swing out to press against the grinding ring so that the materials are sent to the gap between the grinding roller and grinding ring, achieving the purpose of grinding.
Points need attention
When the milling equipment is in operation, it is important to ensure the safety of production. If there were unusual noise or sudden increase of the load of any parts, the operators should immediately stop the machine for inspection and troubleshooting in order to avoid the major accident. If there is the need to start the machine again, the oddments in the milling machine should be removed. Otherwise, the power current is too large, affecting the startup of the machine.

Rotary Screen/ Rotary Separator/ Rotary Sieve

The rotary screen is used for the screening of fine materials and the powdery materials, having high screening capacity. It is widely used in metallurgy, chemical industry, abrasives, glass, ceramics, construction, light industry, food and other industries.

Superiority
The rotary separator is featured with the superiority of high efficiency, high utilization rate of screen, less clogging, simple structure, small size, light weight, fully enclosed structure, no dust pollution and easy installation. In addition, the small horizontal distance between the feeding inlet and discharging port makes it convenient to arrange the layout of the screening machinery. It can be applied to the screening of various kinds of materials.
1, wide adaptability of materials: rotary screen can be widely used for the screening of various materials such as the coal slime, soot and other materials.
2, simple feeding: the feeding inlet can be designed in accordance with the actual situation and the smooth feeding can be guaranteed without special measures.
3, large screening capacity: the circle area of the rotary sieve is larger than that of other types under the same size so that the effective screening area is larger, which helps the materials to contact with the sieve fully, thus improving the screening capacity.
Structural performance
The rotary sieve is composed of the base, housing, motor and other parts. It adopts the cylindrical mesh structure and the materials in the barrel are constantly stirred, forming the constant updates and advancement of materials. The machine can achieve satisfactory results for the screening of the materials with large viscosity and large mesh.

Impact Pulverizer/ Rock Impact Crusher

Impact Pulverizer/ rock impact crusher
Impact pulverizer is a new kind of high-efficiency crushing equipment with selective crushing effect,which has promising prospect. The rock impact crusher can resist compression and it is widely used in building materials, transportation, energy, cement, mining, chemical and other industries for crushing materials.

Advantages
1) simple structure, small size, light weight, large capacity, low production costs;
2) ore is crushed along the joint plane, which guarantees the less power consumption and high efficiency;
3) it has the selective crushing role and the granularity of the crushed product is more uniform;
4) large crushing ratio simplifies the crushing process and reduces the cost of the dressing plant;
5) the gap between the back plate and plate hammer can be easily adjusted to realize the effective control of the particle size and particle shape.
Working principle
The impact pulverizer is the crushing machine that makes use of the impact force to crush the materials. When the rock impact crusher is in operation, driven by the motor, the rotor will be in high-speed rotation. The materials will impact against the hammer on the rotor after they enter the operation area of the hammer and then the materials will be re-crushed by being thrown on the counterattack device. This process is repeated until the materials are broken to the desired particle size and then the materials will be discharged from the discharging port. In addition, the adjustment of the gap between the frame and the rotor can change the discharging granularity and the material shape.

Horizontal Kiln/ Horizontal Lime Kiln

The horizontal kiln that is also known as the horizontal lime kiln , which belongs to the class of building materials equipment. Its technical performance and operating condition largely determine the quality of the product, productivity and cost of enterprise. In the building materials industry, apart from the calcination of cement clinker, the rotary kiln can be also used to calcine clay, limestone and dry the slag and so on; in the production of refractory materials, the horizontal kiln is used for the calcination of raw materials to make its size stabile and increase its strength and then conduct the machine shaping process. In the beneficiation process, the users can use the rotary kiln to magnetic roasting the depleted iron ores so that the original weak magnetism of the ores can be changed into the strong magnetism to facilitate magnetic separation.

Technical features
1, the rolling and moving of the material is smooth and placid; the material layer is uniform and stable; the quality of clinker can be improved;
2, in the operation of the horizontal lime kiln, there is no need to change the existing process parameters, which will not consume any material, significantly improving the comprehensive economic efficiency;
3, the kiln lining, bearing bush, motor and the kiln body can be effectively protected, significantly extending the service life.
Classification
The classification of the rotary kiln: in accordance with the usage, the rotary kiln can be divided into cement rotary kiln , ceramic sand rotary kiln, kaolin rotary kiln, lime kiln; in accordance with the different effects of energy supply, it can be divided into gas rotary kiln, coal-fired rotary kiln, mixed fuel rotary kiln. In accordance with the different process, the rotary kiln can also be divided into wet and dry types rotary kiln, dry process rotary kiln, kiln dryer and so on.

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Rock Grinder

The rock grinder, which is one kind of the mining equipment , refers to the crusher that makes the content of the materials whose particle size is greater than three millimeters occupies more than 50% of the total discharging amount. The crushing operation of the mineral ore is usually divided into coarse crushing, medium crushing and fine crushing. Accordingly, there are many types of crushers.

Application and features
The rock grinder is widely used in mining, smelting, building material, highway, railway, water conservancy and chemical industry and many other sectors. It is featured with the advantages of large crushing ratio, uniform particle size, simple structure, reliable operation, easy maintenance, low costs (including operation cost, crusher price and so on) and other characteristics. For example, the impact pulverizer is suitable for the crushing of hard materials such as the crushing of limestone in cement plant , which has the advantages of large productivity and small discharging particle size.
The importance of crushing
There are a large number of raw materials and recycling waste needing to be processed with the rock grinder every year in metallurgy, mining, chemical, cement and other industrial sectors. For example, in the dressing plant, in order to achieve the monomer separation of the useful ores, there is the need to conduct the aggregate crushing of the raw mineral ores to the desired particle size. In the coking plant, sinter plant, ceramics factory, the glass industry, powder metallurgy and other departments, the crushing machine is necessary for the required particle size for the next procedure.