Installation and maintenance
Pay attention to the main points
From the perspective of use, the following points should be paid attention to to ensure that the bearing can work reliably:
1. Improve the quality of lubrication, control the pressure, temperature and flow of the oil, and strengthen the oil filtration.
2. Use fuel and lubricating oil that meet the requirements.
3. To control the temperature status of diesel generator sets, it is disadvantageous to work under the conditions of over-cooling and over-heating. In cold weather, the diesel engine should be warmed up before starting, and the crankshaft should be turned by hand to make the oil enter the friction surface.
4. The surface quality and geometry of bearings and journals should be strictly guaranteed.
5. The bearing clearance should be appropriate. If the generator set is too large, impact will be generated.
How to ensure the reliable operation of the bearing
Generally speaking, pay attention to the following points from the perspective of use:
1. The bearing clearance should be appropriate, too large will cause impact, too small will cause poor lubrication, and may burn bushes;
2. The surface quality and geometry of bearings and journals should be strictly guaranteed;
3. Improve lubrication quality, control oil pressure, temperature and flow, and strengthen oil filtration;
4. Use fuel and lubricating oil that meet the requirements.
In order for the bearing to give full play to and maintain its due performance for a long time, it is necessary to do a good job of regular maintenance (regular inspection). Through appropriate regular inspections, it is very important to improve productivity and economy to detect faults early and prevent accidents before they occur.
Install
Whether the bearing is installed correctly affects the accuracy, life and performance. Therefore, the design and assembly department must fully study the bearing installation. Hope to install in accordance with operating standards. The standard operation items are usually as follows:
(1) Clean the bearing and its related parts
(2) Check the size and finishing of related parts
(3) Installation
(4) Inspection after bearing installation
(5) Supply lubricant
It is hoped that the bearing package will be opened just before the installation. General grease lubrication, without cleaning, directly filled with grease. Lubricating oil does not need to be cleaned in general. However, the bearings for instruments or high-speed use should be cleaned with clean oil to remove the rust inhibitor coated on the bearings. Bearings with anti-rust agent removed are easy to rust, so they cannot be left alone. In addition, bearings that have been packed with grease can be used directly without cleaning.
The installation method of the bearing varies with the bearing structure, fit, and conditions. Generally, because most of the shaft rotates, the inner ring needs an interference fit. Cylindrical bore bearings are usually pressed in with a press or hot-fitting method. In the case of a tapered hole, install it directly on the tapered shaft or install it with a sleeve.
When it is installed on the shell, there is generally a lot of clearance fit, and the outer ring has an interference. It is usually pressed in with a press, or there is also a shrink fit method for installation after cooling. When dry ice is used as the coolant, the moisture in the air will condense on the surface of the bearing when the shrink fit is installed. Therefore, appropriate anti-rust measures are required.