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The items of the job standard are usually as follows:
(1), cleaning the bearing and bearing connection (2), checking the size and finishing of the connected parts (3), installation (4), inspection after the bearing is installed (5), the supply of lubricant is expected to be in the mortar Before the car is opened, the bearing package is generally lubricated with grease, not cleaned, and directly filled with grease. Lubricating oil is not necessary for cleaning. However, for instruments or high-speed bearings, it should be cleaned with clean oil to remove the rust inhibitor applied to the bearing. The bearing with the rust preventive removed, it is easy to rust, so it can not be placed. Furthermore, bearings that have been sealed with grease are used without cleaning.
The mounting method of the bearing varies depending on the bearing structure, fit, and conditions. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, press with a press, or use a hot charging method. For taper holes, mount directly on the taper shaft or with a sleeve.
When installed in the outer casing, there is usually a lot of clearance and the outer ring has an interference. It is usually pressed by a press or there is a cold shrink fit method after cooling. When dry ice is used as a coolant and cold shrinkage is installed, the moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.
1. Installation of vibrating screen cylindrical bore bearing (1) Pressing method with press The small bearing is widely used by press intrusion. The pad is placed in the inner ring and pressed tightly to the inner ring with a press to closely contact the shaft shoulder.
When operating, Zui is good to apply oil on the mating surface in advance. If you have to use a hammer to knock on the installation, you should put a block on the inner ring. This practice has often become the cause of bearing operation, so it is limited to the case of low interference, not for large interference, or medium and large bearings.
For non-separable bearings such as deep groove ball bearings, where the inner ring and the outer ring need to be installed with interference, use the pad pad and use the screw or oil pressure to press the inner ring and the outer periphery at the same time. The outer ring of the self-aligning ball bearing is easy to tilt, even if it is not an interference fit, it is also installed on the pad.
For the separate bearings such as cylindrical roller bearings and tapered roller bearings, the inner and outer rings can be mounted on the shaft and the outer casing respectively. When the inner ring and the outer ring are respectively assembled, the key is to stabilize. The two are closed together so that the center of the two does not deviate, and the press-in will cause the raceway surface to be stuck.
(2) Hot-packing method Large-sized vibrating screen bearings require a large force when pressed, so it is difficult to press in. Therefore, the method of heating the bearing in the oil to expand it and then attaching it to the shaft is widely used. With this method, it is possible to complete the work in a short time without adding undue force to the bearing.
2. The mounting of the tapered bore bearing is to fix the inner ring directly to the tapered shaft, or to the cylindrical shaft with the adapter sleeve and the disassembly sleeve. Vibrating screen large self-aligning bearings are often installed with oil pressure.
3. Operation check After the installation of the vibrating screen bearing is completed, in order to check whether the installation is correct, the operation check is required, and the small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor running due to foreign matter, scars, and indentations, uneven rotation due to poor installation, poor machining of the mounting seat, excessive torque due to excessive clearance, and installation error sealing friction. .
Since the large machine cannot be rotated manually, the power is turned off immediately after the load is not started, and the inertia operation is performed to check whether there is vibration, sound, whether the rotating parts are in contact, etc., and it is confirmed that there is no abnormality and then enters the power running.
The power running starts from the no-load low speed and slowly increases to the rated condition rated operation. The items to be checked during the test run are whether there is abnormal noise, transfer of bearing temperature, leakage of lubricant, discoloration, etc.
The temperature check of the vibrating screen bearing is generally estimated from the appearance of the outer casing. However, the oil hole is used to directly measure the temperature of the outer ring of the bearing, which is more accurate. The bearing temperature starts to increase gradually. If there is no abnormality, it is usually stable after 1~2 hours. If the bearing or the mounting is defective, the bearing temperature will rise sharply. In the case of high-speed rotation, the selection of the lubrication method of the bearing is also the cause.
About the installation standard of the vibrating screen bearing and the installation and maintenance method
Whether the vibrating screen bearing is installed correctly affects accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of vibrating screen bearings.