Briquette production generally requires material particle size of ≤ 3mm. There are many crushers that can meet this performance. The crusher has its own characteristics. What kind of crusher should be used in its own briquette production needs comprehensive consideration, not blind Which kind of crusher is good, because different working conditions and different coal types require different crushers, such as crusher for crushing anthracite and crusher for crushing blue carbon powder, producing coal rod and briquettes The particle size requirements are different for different crushers. The production of briquettes for industrial boilers or for civil heating also has different requirements for crushers. Therefore, the following focuses on the performance and characteristics of several crushers commonly used in briquette production to facilitate Briquette companies use it as a reference when choosing a crusher.
1, squirrel cage crusher:
The squirrel cage crusher is also called cage crusher. It is an old product and is used in various industries in China. In recent years, the crusher has been used in many coal briquettes with its stability. The working principle of this crusher is The two reverse-rotating squirrel cages run at high speed, and the material enters the squirrel cage frame. The hammer hammer on the round wheel in the frame produces repeated impact crushing on the material, so that the material achieves the crushing effect. The characteristics of the cage crusher: Fine crushing size (≤ 2mm), large production capacity, strong adaptability, suitable for large moisture materials, the disadvantage is that it is relatively troublesome to repair and replace parts, the use cost is relatively high, and the power is large; currently the crusher is mainly in industrial coal. It is used more in rod production.
2. Counter crusher:
The counter crusher is also called the counter hammer crusher or the hammer crusher. As the name suggests, the crusher works by scraping the material back to the fixed liner multiple times through the high-speed rotating hammer to achieve the purpose of fine crushing. Entering the crushing chamber, it is broken under the impact of the high-speed rotating hammer. At the same time, the crushed material obtains kinetic energy from the hammer head, impacts the counterplate at high speed, and breaks again. The materials collide with each other during the movement, so that after repeated crushing The fine particles and powders are discharged into the discharge port through the small gap of the crushing chamber and are excluded from the machine. The wearing parts of the crusher are mainly hammers. Generally, the hammer head needs to be turned over and used after being worn for a period of time. After both sides are worn, it is necessary to replace the new hammer head or use the hammer head for welding.
The crusher has the characteristics of large crushing ratio, strong material adaptability, adjustable discharge granularity, large production capacity, simple replacement of wearing parts and low power consumption. The disadvantages are: high noise, large amount of dust, and crushing granularity. Relatively thick. At present, such crushers are widely used in the production of briquettes.
3. Reversible counter hammer crusher
In principle, the reversible counter-attack hammer crusher can be said to be an upgrade product of the counter-crusher. The basic principle and characteristics are the same as those of the counter-crusher. The highlight of the crusher is that the rotation direction of the rotor during the working process is arbitrary, that is to say Regardless of the same effect of clockwise or counterclockwise rotation, this structure prolongs the service life of the hammerhead. Compared with the counter-crusher, which can only rotate in one direction, it reduces the step of turning the hammer and reduces the loss of the wearable parts. The frequency extends the continuous working time of the crusher, because the rotation can be operated in two directions, which greatly reduces the phenomenon of blocking. This crusher is also called a non-blocking crusher.
The crusher has the characteristics of large crushing ratio, no blocking material, adjustable discharge granularity, large production capacity, convenient and simple maintenance, and low energy consumption. The disadvantages are: the amount of dust is large, and the crushing granularity is relatively coarse. At present, this kind of crusher is widely used in the production of briquettes, and it is also used in the squirrel cage crusher.
4, double crusher
The two-stage crusher is mainly used for the occasion where the required discharge size is fine. It can replace the squirrel cage crusher in the production of coal briquettes. Its structure is similar to the combination of two counter hammer crushers. After entering the first-stage crusher, the material enters the first-stage crusher. After the primary crushing, the secondary crushing is entered in the case of obtaining the kinetic energy of the primary crusher, thereby achieving the requirement of fine crushing. The production capacity is lower than that of the single-machine hammer of the same model, and the probability of blocking the material is greater than that of the same model. High, the discharge granularity is much thinner than the hammer of the same model.
The crusher is characterized by a large crushing ratio and convenient and simple maintenance; the disadvantage is: high energy consumption. At present, such crushers are widely used in the production of briquettes.
5, vertical crusher
The vertical crusher means that the drive shaft is vertical. Compared with the above several horizontal shaft crushers, the above crushers can also be collectively referred to as horizontal crushers.
The vertical crusher is generally equipped with a multi-layer hammer head on a vertical shaft in a circular crushing chamber. The material enters the crushing chamber from the upper inlet port, and reaches the first layer hammer head through the free falling body. The material that arrives is quickly smashed to the lining of the barrel wall by centrifugal force. When the material encounters the lining, it will rebound to the center of the barrel and fall to the second layer of the hammer. After so many crushing, it is removed through the bottom of the crusher. Finely broken requirements. Because the production of briquette is mostly fine crushed pulverized coal, and most of the materials contain a certain amount of water, the rebounding force of the material during the crushing process is small, especially after the upper wall of the cylinder is partially broken, the material is almost lost. Resilience, so it is easy to cause blockage, the crushing effect is poor, and currently there are fewer users of briquette production.
The crusher is characterized by simple and convenient maintenance, low energy consumption and small crushing ratio, which is suitable for dry coal crushing. At present, such crushers are rarely used in coal briquette production.
Summary: The choice of crusher in the production process of briquette should be selected according to its own working conditions. It can not blindly admire or negate certain crushers. Each type of equipment has its own characteristics. It can also be combined in the process of selecting crushers. The production situation chooses two types of crusher combination production; it is not recommended to select the crusher with sieve bottom in the production of coal, because it is easy to block the material once the coal is wet and the production is reduced. It is quite troublesome to clean up.
The particle size of the coal in the production of briquette is very important. If the material is too fine or too thick, it will affect the strength of the briquette.
Molding moisture, the amount of binder added, and the reasonable gradation ratio of the material are very important (the gradation ratio of the briquette will be described in detail in the later article); the crusher determines the gradation ratio of the broken material, so choose Suitable crushers are especially important in the production of coal briquettes; the technical parameters of the above crushers are based on several crushers produced by Zhengzhou Dacheng Heavy Industry Co., Ltd., of course, the crushers suitable for briquette conditions are not limited to As mentioned in the article, in principle, as long as the crusher that can meet the crushing grading requirements can be used in the production of coal.
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