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What is the function of the linear speed of the sand mill?

Release Time:

2021-06-01

There are often a lot of professional terms in the chemical equipment industry. If you have no deep contact with chemical equipment, it is easy to get confused. Xiaobian here is a part of the professional vocabulary that appears more frequently and has an impact on work efficiency and quality. Analysis, this chapter mainly talks about a vocabulary that affects the efficiency of sand mills the most - line speed

So what exactly is the linear speed of the sand mill? Does it have any effect on the grinding efficiency of the sand mill? How big is the effect?

The linear speed is the number of turns of the dispersion disc of the sand mill in the unit speed converted into the stroke of the dispersion disc per unit time (the circumference of the dispersion disc X the number of revolutions)

The expression formula of linear velocity is as follows:

Linear velocity V=2πωr (unit m/s)

Example: There is a horizontal sand mill whose rotational speed is 1200 rpm, that is, 20 rpm, and the diameter of the grinding disc in the cylinder is 300 mm, that is, the straight line distance from any point on the circumference of the grinding disc to the center of the shaft is 0.15 meters. The maximum linear speed is V=2*3.1416*20*0.15 m/s=18.85 m/s. The linear speed of the sand mill we usually talk about refers to the linear speed of the machine grinding disc (meaning how much the grinding disc runs in 1 second) meters, which can be easily calculated by converting the units).

The relationship and influence between the linear speed of the sand mill and the grinding efficiency

The higher the linear speed of the sand mill, the greater the kinetic energy transmitted to the beads, and the higher the efficiency of the sand mill! But isn't the higher the better? Of course not. The disadvantages of too high linear speed of the sand mill are as follows:

The higher the A-line speed, the greater the heat, and the faster the machine heats up. For most materials, there is a temperature limit.

The higher the linear speed of B, the greater the impact on the grinding medium of the sand mill, and the grinding medium is likely to be broken because of this.

The higher the C line speed, the greater the damage to the machine and the increased wear on the parts. Therefore, the material requirements for the manufacturing machine are higher.

The linear speed of the sand mill is generally between 5-10m/s (the industry experience of each sand mill manufacturer is different, the experimental data is different, and the final summary results are different), the real effective grinding area of ​​the sand mill is In the narrow area between the grinding disc and the barrel wall, other parts are heat-generating areas. Therefore, the most efficient horizontal sand mill is to use the appropriate linear speed to concentrate the grinding media in the effective grinding working area.

Different sand mill manufacturers design and manufacture sand mills with different linear speeds and different grinding efficiencies based on different industry experiences. The main factor is determined by the quality of the material used by the machine and the strength of the grinding media used. Common factors that affect the efficiency of wet grinding horizontal sand mills can be found on this site. For more sand mill professional vocabulary and other related technical knowledge, please pay attention to this site!