Research on structure parameters of vertical impact crusherDate: 2019-08-16 Views:
Working principle of the vertical impact crusher is from structure to different conventional jaw crusher, cone crusher and roll crusher forced crushing equipment, also the conventional ball mill and the grinding, half since mill grinding equipment, such as probability and different from traditional counterattack crusher and hammer crusher impact crushing equipment of a new type of impact crusher.
1.Determination of disc diameter and thickness
At present, the use range of rotor linear speed of vertical impact crusher is (15 ~ 80)m/s.Although the higher the rotor linear velocity is, the larger the crushing ratio is, and the finer the product granularity is, the faster the hammerhead wears off and the greater the power consumption is.Therefore, in the case of meeting the requirements of product granularity, the linear velocity of the rotor should be selected as low as possible. Generally, the value of the linear velocity of the rotor is (30 ~ 50)m/s.
2.Determination of layer number of disc and hammer head
The layer number of disc and hammer head is one of the most important structural parameters of vertical impact crusher, which directly affects the particle size and power consumption of crushing products.In general, the proportion of fine grain size increases with the number of layers in the disc and hammerhead.At the same time, the number of disc and hammer head layer is also an important basis to simplify the machine structure and reduce the weight of the machine.In order to facilitate the study of disc and hammer head layer number and the relationship between product size, designed a 400 type vertical impact crusher, the following through the test to determine the disc and hammer head layer number.
Model 400 vertical impact crusher is a kind of multi-stage crushing equipment, the number of impact and crushing increases with the number of layers.In order to determine the influence of layers on product granularity, the optimal number of disc and hammerhead layers at a certain rotor linear velocity was determined, respectively at v=18.8m/s and v=28.Under the two conditions of 3m/s, change the number of layers and give people (10 ~ 20)mm limestone.
As can be seen from the product particle size distribution curve, when the rotor linear velocity is at 18.At 8m/s, when the number of layers is above four, the negative cumulative yield of products changes little.When the rotor linear velocity is 28.When the number of layers is more than five layers, the negative cumulative yield of products does not change much.This shows that, at a certain fixed speed, the collision force generated by the hammerhead is a certain value, and after the particle size of the product reaches a certain fineness, the strength of the material increases with the reduction of particle size. When the crushing force generated by the hammerhead is in balance with the material strength, the material will not be broken again.It is useless to increase the number of disc and hammerhead layers, which only increases the power consumption.
3.Determination of hammer head quality
In determining the hammerhead quality, on the one hand, it should be able to break the material, on the other hand, the hammerhead should not be excessive deviation.According to the relevant information, the deflection of the hammer head mainly relates to the rotation speed of the rotor.
According to the crushing theory, to break the material, it must meet the energy and force conditions.The energy condition refers to that the energy E generated by the hammer head mass must be greater than or equal to the work A required for crushing the material.The force condition means that the impact force produced by the collision between the hammer head mass and the material must be greater than the force required when the material is broken.Generally speaking, the impact force produced by the collision between the hammer head mass and the material is far greater than the force required when the material is broken, which is not considered here.
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