How to extend the service life of industrial bearings

The negative pressure generated in the bearing can form water intrusion from the main seal, and the structure of the hole seal has a great influence on the negative pressure. Therefore, the negative pressure in the bearing is the basic requirement to avoid water entry. The most useful method is to keep the hole seal from directly touching the water, while preserving the original function of the hole seal - to prevent water and dirt from entering from the side of the roller neck. The sealing method uses surface touch instead of line touch, whether it is a working process, or a static process, the surface touch hole seal has the characteristics of good sealing self-smooth bearing. Therefore, the new over-capacity sealed clean roller neck bearing has higher reliability than the traditional sealed roller neck bearing.

Additionally, a new generation of oil and grease seals, the MudBlock, has been developed for the newly oil-free self-smoothing bearings. Its optimized sealing structure can usefully avoid soil intrusion. The traditional sealing structure is a radial sealing lip, a clamping spring and a fixed sealing ring between the outer diameter and the seat ring. The new structure is a push baffle between the bushing and the sealing ring. The outer surface of the sealing ring and the inner diameter of the bushing are rubber, and the inner lip is pre-smooth with waterproof grease. The MudBlock can be made from a variety of elastic materials depending on operating conditions and self-smoothing sleeve requirements. These materials include: nitrile, polyacrylate, fluorinated rubber, etc.

In order to extend the service life of bearings, we should pay attention to the maintenance and overhaul of industrial bearings in order to prevent accidents in the future, ensure the reliability of work, improve productivity and economy. The best maintenance of the corresponding machinery working conditions of the operation specification, timing. The contents include supervision of working conditions, supplement or replacement of smoothing agent, and inspection of periodic disassembly. As maintenance matters in the work, there are rotating sound of bearings, oscillation, temperature, the condition of smoothing agent and so on.

1. Bearing cleaning: when disassembling the bearing for maintenance, first record the appearance of the bearing, acknowledge the residual stock of smoothing agent, and wash the bearing after sampling and viewing the smoothing agent. As a cleaning agent, the general use of gasoline, oil. The cleaning of the removed bearings is divided into coarse cleaning and fine cleaning, respectively, placed in the container, first put the metal mesh bottom, so that the bearing does not directly touch the dirt of the container. When rough cleaning, if the bearing rotates with dirt, it will damage the rolling surface of the bearing, and attention should be paid to it. In the crude cleaning oil, use the brush to remove smooth grease and sticky matter, and turn to fine washing after roughly clean. Fine cleaning is to rotate the bearing in the cleaning oil while carefully cleaning. In addition, the cleaning oil should always be kept clean.

2, bearing maintenance and discrimination: in order to distinguish whether the bearing dismantled can be used, to check after the bearing is cleaned. Check the condition of raceway surface, rolling surface, cooperation surface, cage wear, bearing clearance addition and unrelated scale precision reduction damage, abnormal. Non-separation type small ball bearings, then use one hand to support the inner ring level, rotating the outer ring to admit whether it is smooth. Tapered roller bearings and other detached bearings can view the raceway surface of the tumbling body and outer ring respectively. Because large bearings can not be rotated by hand, pay attention to the appearance of the tumbling body, raceway surface, cage, rim surface and so on. The higher the importance of bearings, the more stable they must be viewed.

3. The intention of smooth bearing: the intention of smooth rolling bearing is to reduce internal conflict and friction of bearing, avoid burning and sticking. Its smooth effect is as follows. Inlet pump valve

(1) Reduce conflicts and friction damage. In the bearing ring, tumbling body and retainer touch each other part, avoid metal touch, reduce conflict, wear.

(2) extended fatigue life. The rolling fatigue life of the bearing is extended when the rolling touch surface is smooth and outstanding in rotation. On the contrary, the oil viscosity is low, smooth oil film thickness is not good, then shorten.

(3) Discharge conflict heat and cooling. The circulating oil feeding method can use oil to discharge the heat generated by the conflict, or the heat transmitted from the outside, cooling. Avoid bearing overheating, avoid smooth oil itself aging.

(4) Others: It also has the effect of avoiding foreign matter invading into the bearing, or avoiding rust and corrosion. Smooth method: the smooth method of bearings is divided into grease smooth and oil smooth. In order to make the bearing function well, first of all, we should choose smooth methods suitable for the use of conditions and intentions. If only smoothness is considered, oil smoothness prevails. However, grease smooth has the expertise to simplify the structure around the bearing, and the interests of grease smooth and oil smooth are compared.

4. Bearing device: Whether the bearing device is correct affects the accuracy, life and function. Therefore, the planning and assembly part of the bearing device should be fully discussed. Installation is expected to follow the practice. The items of operation specification are usually as follows :(1) cleaning bearings and bearing trunk parts; (2) Check the scale and finishing of the related components; (3) Device; (4) check after installing the bearing; (5) Supply of smoothing agent.

5, it is expected that before the device, just open the bearing packaging. General smooth grease smooth, do not clean, directly filled smooth grease. Smooth oil is smooth, generally do not have to be cleaned, but instruments or high-speed bearings, etc., should be washed with clean oil to remove the rust inhibitor coated on the bearing. The bearing with rust inhibitor removed is easy to rust, so it can not be placed regardless of. Furthermore, the bearings that have been sealed with smooth grease are directly used without cleaning.

6. The method of bearing installation varies with bearing structure, cooperation and conditions. Generally, because most of the bearings are axis rotation, the inner ring needs interference cooperation. Cylindrical bore bearings, multi-purpose press pressing, or multi-purpose hot charging method. Conical hole, directly installed on the taper shaft, or with a sleeve device.

7, the device to the shell, the general clearance cooperation, the outer ring has interference, usually press into, or there is a cooling device after the contraction cooperation method. When dry ice is used as coolant, the moisture in the air will condense on the surface of the bearing. Therefore, the need for appropriate rust prevention methods.