The use process of the three roll mill

The three roll mill has three rollers mounted on an iron frame. The center is on a straight line. Can be installed horizontally, or slightly inclined. The grinding effect is achieved by the mutual extrusion of the surfaces of the three horizontal rollers and friction at different speeds. The steel drum can be hollow and cooled by water. The material is added between the middle roll and the rear roll. Because the rotation directions of the three drums are different (the rotation speed increases sequentially from the back to the front), a good grinding effect is produced. After the material is ground, it is scraped off by a scraper installed in front of the front roller.

Under normal circumstances, the material of the roller of the three roll mill is the centrifugal casting of chilled cast iron, and the surface hardness is above HS70°; the diameter of the roller is high-precision grinding, which is precise and fine, and the grinding fineness of the material can reach 15um. Therefore, it is possible to produce uniform and fine high-quality products. SM405, S260 type.

Three roll mills are used for mass production, and models S150 and S65 are used for small batches or laboratory use.

1. Preparation of the three roll mill:

① Check whether the position and locking of each component are normal, inject lubricating oil according to the point shown in the figure and turn on the power

②Adjust the front, rear, left, and right handwheels to observe whether the roller linkage is normal

③Remove the dirt on the roller surface: wipe with soft paper or clean cotton yarn, release the knob of the baffle plate

④ Adjust the gap between the front and rear rollers and the middle roller to 0.5 mm and then start the power supply to idle for 1–2 minutes.

2. Working rules of the three roll mill:

①After starting the operation, adjust the gap between the middle and rear rolls to 0.3 mm, press the baffle plate, add the slurry appropriately, visually inspect the coloring depth, fine-tune the rear rollers so that the coloring is evenly distributed over the rollers, and then lock the fixing nut.

②Adjust the handwheel of the front roller with both hands at the same time, so that the front roller slowly touches the middle roller and the surface of the front roller is evenly colored, then lock the fixing nut, and then adjust the angle of the material plate so that it is properly pressed on the roller surface, and the slurry can be uniform. discharge. Check the uniformity of the discharge and the particle size of the finished product, and continue to fine-tune the front and rear rollers until the particle size of the finished product reaches the predetermined requirements. The scraper should be returned in time before and after.

3. After the work of the three roll mill stops:

Remove the paint and clean it in time, wipe the roller and related parts, loosen the scraper and baffle, apply a small amount of oil, and then cover with wax paper for protection.

4. Precautions for three roll mill:

① The surface of the roll is strictly prohibited from bumping and scratching, and it is strictly forbidden for all kinds of metal objects and hard impurities to enter the running roll.

②The working temperature range of the roll: ordinary type: -5°C~100°C, heating type: 20C~220°C

③Roll and roller in normal working time: Gap range: (Reference) Middle and rear roller gap: 0.02~0.25mm, Middle and front roller gap: 0.01~0.25mm.

④ The peak angle of the baffle is strictly prohibited from being damaged, and the contact pressure with the roll surface should be appropriate during adjustment. There are three rollers mounted on an iron frame. The center is in a straight line. Can be installed horizontally, or slightly inclined. The grinding effect is achieved by the mutual extrusion of the surfaces of the three horizontal rollers and friction at different speeds. The steel drum can be hollow and cooled by water. The material is added between the middle roll and the rear roll. Because the rotation directions of the three drums are different (the rotation speed increases sequentially from the back to the front), a good grinding effect is produced. After the material is ground, it is scraped off by a scraper installed in front of the front roller.

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Source: Franli

This article address : The use process of the three roll mill

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