Theoretical Capacity Of Roll Crusher

Abstract

How To Choose Roll Crusher Grease When selecting the right grease for the Roll Crusher, the following factors usually need to be considered: bearing type, speed, operating temperature and load, as well as installation location, seals,…
  • Theoretical Capacity Of Roll Crusher
  • Theoretical Capacity Of Roll Crusher
  • Theoretical Capacity Of Roll Crusher

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How To Choose Roll Crusher Grease

When selecting the right grease for the Roll Crusher, the following factors usually need to be considered: bearing type, speed, operating temperature and load, as well as installation location, seals, shock and vibration, as well as regulatory and environmental requirements.

1, Bearing Type

Need to distinguish between point contact (ball bearing) and line contact (needle bearing and cylindrical bearing). For Roll Crusher rolling bearings, the contact area of ​​the ball movement is relatively small, and the grease with a base oil viscosity of ISO VG 68 to 100 is usually sufficient. Line contact rolling bearings have higher requirements for grease. Not only because the contact surface requires more grease, but also slip and friction. This is not conducive to the formation of a lubricating film, which is liable to cause abrasion. Greases with higher base oil viscosity (ISO VG 150 to 460 or higher) should be selected. It may also be necessary to add an anti-wear additive with a consistency number of NLGI 2.

2, Speed

The Roll Crusher grease should match the speed parameters of the bearing. This depends mainly on the type and proportion of thickeners and base oils. The speed parameter of the grease is not a material parameter, but depends on the type of Roll Crusher bearing and the minimum required run time. Generally speaking, high-speed or low-start torque rolling bearings require grease with higher speed parameters. Low-speed rolling bearings are recommended for lower speed parameters.

3, Temperature

For good lubrication and long working life, it is generally recommended to select the grease based on the temperature of the bearing in the standard operating range. The operating temperature range of the Roll Crusher grease and the stability at high temperatures depend on the type and proportion of the thickener and base oil, the production quality and the production process. Other factors to consider include the highest applicable temperature, the dropping point (the temperature at which the grease is heated under specified conditions, the temperature at which a certain fluidity is reached, called the dropping point), and the minimum applicable temperature.

4, The Load

Because the size of the grease cone of the Roll Crusher is related to the load that can be withstood during use, the grease with a small taper (higher consistency) should be used for the load; if it is subjected to heavy load and impact load, it should be selected. Grease containing extreme pressure additives, such as grease containing molybdenum disulfide.

5, Environmental Humidity

If the working environment of the Roll Crusher is damp, the water vapor easily invades the bearing. If the temperature is suddenly cooled and the heat is heated, the water will easily condense. This problem is particularly acute when there are large holes in the Roll Crusher bearing or housing. Water can cause serious damage to grease or bearings, usually caused by aging, hydrolysis, film failure and corrosion. Composite sulfhydryl and composite calcium-based greases provide good water resistance, which has been certified in practice. The anti-corrosion effect of the grease is also affected by the additive.

6, Oscillation, Shock And Vibration

The oscillating load can have a large effect on the structure of the thickener in the grease. If the mechanical stability of the Roll Crusher grease is not high, the lubrication effect will be affected. This results in softening, deoiling, or hardening of the grease, resulting in reduced lubrication. It is therefore recommended to select a grease whose mechanical stability has been tested accordingly.

7, Sealed

If hard foreign particles penetrate into the bearing, it will not only cause an increase in noise but also wear. Proper sealing of the Roll Crusher bearings prevents this from happening. Grease can enhance the sealing effect by adding a layer of protection to the seal. In this case, a stronger grease type should be chosen.

8, Installation Location And Adjacent Components

Even if the rotating shaft is vertical or inclined, the lubricant must remain at the lubrication point. In addition to proper sealing, choosing a more viscous grease will prevent it from flowing away. If there are multiple lubrication points located close to each other, accidental contact may occur between the greases. It is therefore necessary to pay attention to the compatibility of the greases with each other. However, where possible, the best solution is to use only one grease, which should also be compatible with the sealing material.

9. Regulations And Environmental Protection

Different industrial sectors should also consider legal and environmental factors when choosing grease. For example, in the food processing industry, the use of grease with associated authorization is specified. For details, refer to the H1 or H2 level certified by a global standard NSF (National Health Foundation).

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