The three-roller grinder is mainly used for grinding various pastes such as paints, inks, oil paints, foods, cosmetics and toothpaste. It is the main equipment for researching fine pastes in paint and ink factories.
Three-roller grinding machine works:
The grinding effect is achieved by the surface of the three rollers arranged in the horizontal direction of the machine being squeezed against each other and friction at different speeds. Generally, the grinding material can meet the requirements as long as it is ground twice. The processing fineness can generally reach about 3 ~ 18µm (determined with a fineness scraper).
Adjust the fast and slow rolls to the proper position during work, start the machine, and then add the slurry to be ground to the copper knife between the middle and slow rolls. The fast roller is scraped off by the discharge scraper that is close to the surface, and then flows into the bucket through the blade equipped with the blocking plate, thereby constituting the entire grinding process.
Three-roller mill technical parameters:
★ Roller diameter mm: φ65
★ Roller working length mm: 125
★ Slow roll r.p.m: 32
★ Middle roller: r.p.m: 89
★ Fast roller r.p.m: 250
★ Speed: r.p.m: 1400
★ Power Kw: 0.75
★ Roller speed ratio 1: 2.8: 7.8
★ External dimensions: 420 * 400 * 440mm
★ Weight 80kg
Three-roller grinder machine structure:
★ machine part
The machine body is made of castings, consisting of a machine base and an upper cover plate. The left and right guide surfaces of the machine body are equipped with two rows of slow, medium and fast bearing seats on each side of the slow, medium and fast bearing seats in the horizontal direction, and are connected to the upper pressure plate. Together, the middle roller bearing seat is connected to the body with bolts. The fast and slow roller bearing seat is driven by a pair of gears to drive the screw to rotate forward and backward. The bearing seat is used to support the slow, medium and fast three rollers, and the right end of the roller shaft. It is equipped with a cooling water pipe and a water tank, and the left end device is a transmission gear box. The lower part of the body is equipped with a motor, a slow roll and a middle roll. The surface of the roller is equipped with a blade member for discharging, thereby forming a three-roll mill.
★ Transmission parts
The lower part of the machine base is equipped with a motor, which is transmitted to the fast roller through the V-belt. The fast roller is transmitted to the middle roller through the gear, and the middle roller is then transmitted to the slow roller.
The rollers are divided into fast, medium and slow ones, all of which are made of centrifugal casting of cold-hard alloy. Both ends are heat-treated high-quality steel shaft heads. The roller is used for cooling during work. The hard layer thickness of the roller is not less than 15mm, its hardness is not less than 70 Shore hardness, and the surface is precision ground.
★ Feeding device
The feeding device is composed of a copper knife and a copper knife holder. It is installed at the two ends between the slow roller and the middle roller. On the machine body, it is easy to adjust the margins, as well as to disassemble, clean and clean. The copper knife should be adjusted often to make the surface of the rollers stick.
★ Cooling device
In order to properly eliminate the flatness of the roller contact surface due to the thermal expansion of the working surface of the roller due to friction, a cooling water pipe is installed at the right axis of the roller, a rubber tube is sleeved at the water pipe joint, and the water is passed through the inner wall of the roller. After the heat exchange, it returns to the water tank from the original hole and flows into the sewer.
★ Discharging device
The discharge plate for discharging is installed on the discharge plate bracket of the machine body. A blade is installed on the discharge plate. The blade is adjusted to fasten the surface of the fast roller through the adjustment screw of the discharge plate. The position of the knife edge should be higher than the roller. The middle of the barrel is 5 mm, which makes it easy to scrape off the finely adhered material on the surface of the fast roller.
★ Pressure adjustment device
Rotate the hand wheel, through the action of the gear screw and nut, to promote the fast and slow rollers to move back and forth along the guide rail to adjust the grinding fineness of the slurry.
Three-roller mill operating procedures
★ Check whether the position and locking of each component is normal. Fill in the lubricating oil according to the points shown in the figure and turn on the power.
★ Adjust the left and right handwheels, and observe whether the roll linkage is normal.
★ Remove the dirt on the roller surface: Wipe with soft paper or clean cotton yarn, loosen the handle
★ Adjust the gap between the front and rear rollers and the middle roller to 0.5 mm, then start the power supply to idle for 1-2 minutes.
★ After starting the operation, adjust the gap between the middle and the last two rollers to 0.3 mm, press the baffle plate, add slurry appropriately, visually inspect the coloring depth, fine-tune the rear roller to make the color uniformly cover the rollers, and lock the fixing nut.
★ Adjust the hand roller of the front roller at the same time with both hands to make the front roller slowly contact the middle roller. The surface of the current roller is evenly colored, then lock the fixing nut, and then adjust the angle of the material plate to make it light.
Press on the roller surface, the slurry can be discharged uniformly. 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 finished product reaches the predetermined size. The blade scraper should be returned in time before and after.
★ Remove the paint and wash it in time. Wipe the test roller and related parts, loosen the scraper and the blocking plate, apply a small amount of oil, and then cover it with wax paper to protect it.