A clinker production line with a daily output of 2500 tons. There is only one limestone crushing system and the limestone is only crushed once. The S56 MB56 / 75 hammer crusher is used. For various reasons, the output of the crusher has been 600 tons. Left and right, the board feeding speed has not been raised. If the system fails, production is very passive. The company analyzed the crusher and made the following improvements to increase the output of the crusher by more than 10%.
There are many factors that affect the output of the crusher, such as the grade and particle size of limestone. The company dissected the MB56 / 75 hammer crusher and improved it. Limestone is rotated by the hammer head at high speed, which generates centrifugal force and impact force to crush the material. The material is discharged from the gap of the sieve after the hammer head is hit by the hammer several times. This process is repeated continuously. The particle size of many materials met the requirements without being discharged in time, which is the phenomenon of "over-crushing". It can be seen how to increase the discharge area to the greatest extent so that more crushed materials can be discharged in time and the output of the crusher can be increased.
The sieve of the mine crusher is improved from the sliver. It is equipped with 4 pieces. The width of the original sieve discharge hole is 65mm, which is exactly the size of the product and cannot be changed. Only by changing the wide and short ribs to thin and long ribs can the effective discharge area be improved and the strength of the sieve screen can be guaranteed.
The current discharge area is 4 × 0.065m × 0.345m × 16 rows = 1.45m2. If the rib plate thickness is changed from 0.070m to 0.050m, there will be two more discharge holes for each sieve. In this way, the discharge area is 4 × 0.065m × 0.345m × 18 rows = 1.61m2.
In addition, the sieve support also affects the discharge of the material, and the seamless steel pipe at both ends (outer diameter of 180mm) seriously affects the discharge of the material, especially the middle part, with a width of 0.4m.
The affected area is 0.4m × 2.32m (篦 screen length) × 50% (excluding the width of the steel plate) = 0.928m2. Therefore, the sieve screen support also needs improvement. An iron plate is used at one end to replace the original steel pipe, and the direction of the iron plate is the same as that of the sieve screen plate, so as to overlap as much as possible.
From the above analysis, theoretically the discharge area can be increased by nearly 1 m2. But in fact, there is another factor that affects the output of the crusher, which is the shortest distance (gap) between the hammer head and the impact plate and the sifter. There is not enough material into the sifter and the output is impossible to talk about. The gap between the new hammer head, the new sieve and the impact plate is 0. Under the condition of maximum wear, the gap can reach 100mm ~ 120mm. According to statistics made by Xuzhou Julong Cement Group Co., Ltd., from the closest distance of the counterattack, the starting gap is 80mm, and every 20 degrees in the second half of the circle, the gap is reduced by 5mm ~ 8mm, and the output is the largest. When the particle size of the limestone in the southern part of Huzhou is 65mm, the clearance between the counter-attack plate is 60, the clearance between the sieve and the screen is 50mm, and the clearance after passing through the screen is 40mm. However, the gap of the company's crusher cannot be adjusted, so it is necessary to find an effective way to make this gap within a reasonable range.