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Adjustment of discharging particle size of roller sand making machine and key points of daily maintenance

Release time:Apr.04.2024 Views:0

The double-roller crusher is mainly used for medium-to-fine crushing of brittle and tough medium-hard materials, such as limestone, bluestone, coal gangue, shale, etc. It is widely used in sand and gravel yards and mining.(Stone Crusher)


The double-roller crusher uses rollers to crush materials. It uses two high-strength and wear-resistant alloy rollers to crush materials with high extrusion force generated by relative rotation. After the materials enter the gap between the two rollers, they are affected by the relative rotation of the two rollers. Under the action of extrusion force and shearing force, under the conditions of extrusion, shearing and grinding, the material is broken into the required particle size and then discharged from the discharge port at the bottom of the machine. Since the working distance between the rollers is relatively fixed, it can be The particle size of the crushed products is controlled from being too coarse, and the material is clamped into the extrusion zone between the spokes by pulling force, which can produce a continuous extrusion cycle. It not only has high productivity, but also can handle sticky and wet materials. However, the roller system The feed particle size of the sand machine is relatively small and cannot exceed 40mm.


Since the double-roller crusher relies on double-roller extrusion for crushing, if the gap size between the two rollers is not adjusted appropriately, its crushing efficiency and effect will be affected, thereby affecting the discharge granularity. Below we will briefly explain the factors that affect the discharging granularity and how to adjust it.

1

Influencing factors


Speed and ratio of the two rollers: If the two rollers rotate at the same speed, they can only squeeze the material, while the crushing effect on the material mainly depends on the relative movement and the difference in deflection between the two rollers. Therefore, the speed of the two rollers is the same. Fast and slow are better. The ratio of the speed of the fast roller to the slow roller is the ratio. The larger the ratio, the longer the crushing area, the stronger the crushing effect, and the better the particle shape of the finished product. The commonly used ratio is 2.5-1.


Note: Although the faster the rotation speed of the rolling spokes, the higher the output, but too fast speed will cause increased power consumption and machine vibration, accelerated tooth wear, bearing heating, and excessive roll temperature, so the speed should be appropriate.


Rolling distance: When the double-roller sand making machine is working, the motor drives the pulley and wheel chain through the transmission triangle belt, and the two rollers rotate in the opposite direction to squeeze the material. The rolling distance is adjusted according to the particle size to be obtained. Yes, the rolling distance determines the discharge fineness of the finished material, so the rolling distance has a great influence on the crushing effect of the material, and the roller sand making machine can also control the particle size of the finished product.


Feeding: Constant feeding is also the key to improving the quality of finished materials. When the feeding is unstable or insufficient, the materials are affected by the inner lining plate and the outer lining plate in the crushing cavity, and are easy to form needles and flakes, and When the feed supply is sufficient, the materials entering the crushing chamber will be laminated and crushed, resulting in extrusion, crushing and grinding between the materials to obtain finished materials with excellent particle shapes.


Discharge port: When the discharge port is adjusted to be consistent with the particle size of the finished material, the particle shape is better. The needle flake content is lower when the discharge port is larger than the particle size than when the discharge port is smaller than the particle size. This is because for the same feed If the discharge opening is small, the crushing ratio will be large, so the particle shape will become worse.


Model size: The size of the model is directly related to the size of the particle size discharged by the roller sand making machine. The larger the model, the finer the particle size of the material discharged per unit time. The smaller the model, the coarser the particle size of the material discharged per unit time.

New high resistance to rollers



How to adjust


When the particle size discharged from the roller sand making machine cannot meet the usage requirements, the following two methods can be used to adjust the gap to achieve the actual required particle size.

1. Adjusting bolt: In practical applications, adjusting the position of the bolt can change the roller distance and thereby adjust the discharge granularity. The wedge-shaped device is installed between the two rollers of the double-roller sand making machine, and the bolt is located on the top of it. When the adjusting bolt pulls up the wedge, the wedge of the crusher pushes the movable roller away from the fixed wheel, which can increase the size of the two rollers. On the other hand, when the wedge is downward, the movable roller can reduce the distance between the two rollers under the action of the compression spring and reduce the discharge granularity.

2. Number of gaskets: Place gaskets of different thicknesses between the frame and the movable bearing. By increasing or decreasing their number or changing their thickness, the distance between the two rollers can be changed to adjust the discharge granularity. If you want to expand the discharging granularity, add gaskets to make the gap between the two rollers larger; if you want to reduce the discharging granularity, reduce the gaskets and make the gap between the two rollers smaller.


Note: Do not blindly adjust the discharge thickness of the roller sand making machine, because it is determined according to the user's production needs.



Daily maintenance points


Any machine needs maintenance during use, and the same is true for roller crushers.


1. The inspection door next to the roller chamber of the crusher should be inspected every 2-3 days to see if there are large foreign objects and the wear and tear on the surfaces of the two rollers. If there are large foreign objects, they should be removed in time. If the surface of the rollers is worn to a certain extent, , it must be repaired in time (open the front and rear doors of the chassis for repair welding), and at the same time, the roller skin bolts must be tightened in time to prevent the roller skin from loosening.

2. After the roller sand making machine has been running for a long time, due to the large wear of the roller surface, the product particle size will be too fine. At this time, attention should be paid to adjusting the discharge port or maintenance equipment, and regular maintenance of the roller surface.

3. After the roller surface is worn, the width of the discharge port increases, and the movable roller needs to be adjusted. During the adjustment process, pay attention to keeping the two rollers parallel to each other to prevent skewing.

4. When crushing materials with a large moisture content or excessive viscosity, it is easy for the materials to stick or block the equipment. At this time, the machine must be stopped in time and the cause of the blockage must be dealt with. Do not proceed directly while the roller crusher is in operation. To avoid damaging the equipment, or even causing the ore medium to break inside the equipment, causing more serious production accidents.

5. During the production process, occasionally unbreakable objects accidentally fall into the double rollers and cannot pass through, and are repeatedly flipped between the double rollers, which can easily cause damage to the double rollers and even cause the equipment to shut down, greatly shortening the service life of the double rollers. Therefore, An iron removal device can be added to the feed port of the roller sand making machine to avoid this phenomenon.

6. During operation, you need to pay attention to check the shape changes of the roller. The concave surface will be generated after the outer diameter of the roller is worn, which will increase the gap between the two spokes and exceed the allowable range, thereby affecting the crushing effect. If the degree of wear is average, it can be turned or grinded. Repair the roller according to the repair method of the outside grinder and continue to use it. If the wear is serious, the roller needs to be replaced with a new one.

7. The lubrication of the roller sand making machine is a key link to slow down the wear of parts and maintain the good operating condition of the equipment, especially the lubrication of the rolling bearings. It is necessary to select appropriate lubricating oil (grease), and regularly inject engine oil in a quantitative amount for lubrication and sealing to prevent Water and dust contaminate the lubricating parts. The lubricant must be replaced in time after it has been used for a period of time or deteriorates. The oiling parts of the roller sand making machine include: transmission bearings, drum shaft bearings, all gears, movable bearings and sliding surfaces. (Try to refuel and lubricate the bearings every shift. When the clinker temperature and weather temperature change, the frequency and amount of refueling must be appropriately adjusted.)

8. Because the scraper wears quickly and is a wearing part, the gap between it and the roller must be adjusted frequently to keep it at 1~1.5mm to ensure a better mud scraping effect. If it cannot be adjusted, it should be repaired in time. or replace.

9. Since the roller sand making machine vibrates heavily when working, some fasteners are easy to loosen. Therefore, it is necessary to regularly check whether the fasteners are loose. If parts are found to be loose, they should be tightened immediately.

10. Make preparations for accessories. Make sure to stock a set of roller covers (wear-resistant cladding electrodes), a set of transmission triangle belts, 20 sets of roller cover elliptical bolts, 20kg of wear-resistant cladding electrodes, a set of main bearings, a set of self-made bolt tightening socket wrenches, and several Adjustable steel bars with different thicknesses, etc.

11. For roller-type double-roller sand making machines with sliding bearings, attention should be paid to the clearance of the roller bearing. The top clearance between the roller bearing bush and the journal is usually 1/10000 to 1.5/10000 of the journal diameter. The side clearance of the bearing bush is 1/2~1/3 of the top gap.