When the pulverizer is working, the material enters from the upper feed port, the material motion vector direction is downward, and the hammer exits at the pulverizer feed port, and the hammer hammers the material along the circumferential tangential direction. At this time, the hammer and material hammer speed difference is poor. The biggest and most efficient. Then, the material and the hammer are moved in the same direction on the surface of the sieve, and the hammer speed difference between the hammer and the material is reduced, and the pulverization efficiency is lowered. The basic principle of the scissor hammer pulverizer to improve the efficiency of the pulverizer is to increase the hammer speed difference between the pulverizer hammer and the material, and this concept is recognized by many experts and peers. Therefore, increasing the speed difference of the pulverizer has always been pursued by people.
In order to solve the problem of speed difference in the pulverizer, many experts have made a lot of efforts to summarize the following six technical points:
1, properly adjust the hammer screen clearance
By utilizing the frictional force of the surface of the screen and the different frictional force of the material and the surface of the screen, the hammer speed is adjusted to increase the hammer speed difference between the hammer and the material, thereby improving the efficiency. However, in the feed production process, the sieve holes are different, the raw materials are different, and the hammer sieve gap needs to be adjusted frequently; in the pulverizer, the particle composition of the pulverizer inner cavity will also change after the pulverizer has just started working and working for a period of time; In the parts of the pulverizer, the hammer is easily worn, and after the front end of the hammer is worn, the gap change of the hammer screen is increased, the output is lowered, and it is difficult to last. Of course, in order to meet the needs of a certain crusher production test work, for a certain raw material, a certain mesh hole, determine the appropriate hammer screen clearance and suction, can be short without considering the service life of the sieve and the hammer. The data of high pulverization efficiency is obtained in time, but in the production of feed pulverization, the specific measurement data appearing on the condition of the operator's work experience is the same as the technical content of the pulverizer itself. People with rich operational experience and their labor also need high cost of use. After the hammer is worn, the hammer screen gap increases, the friction force decreases, and the pulverization efficiency decreases.
2, the rational use of the reverse burr of the sieve
Putting the hairy side of the sieve punching hole inside can increase the friction, but after a while, the efficiency of the mesh hole burr is not enough. The lasting time is about 30 minutes to 1 hour.
3, increase the suction
Adding negative pressure to the pulverizer system, sucking the material attached to the inner surface of the sieve to increase the friction of the material on the surface of the sieve, and also increase the hammer speed difference between the hammer and the material, but the increase of suction will also increase the hammer and sieve. Wear and efficiency are not durable. At the same time, the power consumption of the suction is also increased.
4. Place the seesaw in the pulverizer
The seesaw has the function of resisting the material ring, but the effect is limited. First, the teeth of the seesaw act on the front end of the hammer, the friction surface is small, and the hammer wear also has durability problem; the second is that the seesaw squeezes the wrap angle of the sieve, and the seesaw area is too large. Decrease, while the screen area is too small, the yield will decrease.
5, using fish scale screen technology
There are many small protrusions on the surface of the fish scale screen to enhance the friction. The scale screen does not occupy the screen angle and can increase the screen area. It is better than the jaw board, but the small protrusion of the scale screen is easy to wear, the price is expensive, and the promotion is very difficult. After accounting for increased production and the cost of rejecting the sieve, the benefits are not significant.
6, using thin hammer technology
The shape of the thin hammer is narrow (4 mm or less). The principle is that it is not easy to stir up the material, and it is not easy to produce the tendency of the material to rotate at the same speed as the hammer. Under normal circumstances, after the pulverizer of the same type structure adopts a thin hammer, it can increase the output by about 20% on the original basis. The thin hammer technology is more effective and concealed, which is very beneficial to various pulverizers. The sales of the products, especially when the pulverizer is measuring the output, produce a short-term state favorable to the pulverizer manufacturer, and it is easy to sell other products with non-effective technical characteristics. However, the thin hammer has a short service life, and generally needs to be replaced after about 10 days of continuous use. After removing the low-yield of the last few days and removing the money, time and labor costs of replacing the hammer, the benefits are limited.
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