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Sep. 27, 2020
The rotor impeller is the main component of a vertical shaft impact crusher, and its service life directly determines the maintenance cycle and operating rate of the equipment. Although the rotor will inevitably be worn during production, the correct analysis of its wear, replacement standards and the formulation of maintenance methods will greatly improve the operation of the entire equipment and extend the actual service life.
Before understanding the wear and maintenance of rotor components, let us first understand the main structure of the lower rotor impeller. At present, the vertical shaft impact broken rotor impeller on the market is divided into three chambers and four chambers.
Rotor impeller structure
The rotor of the VSI Sand Making Machine is mainly composed of the rotor body, the distribution plate, the feeding hole sleeve, the guide plate, the upper wear plate, the lower wear plate and the top wear plate. The routine maintenance process mainly focuses on the regular replacement of wear parts and the welding repair of the rotor body wear. Equipment maintenance and operating personnel can determine the operating status of the entire equipment through the wear of each part of the rotor.
Wear analysis and maintenance methods of rotor wear parts
1. Wear analysis and maintenance methods of the throwing head
(1) Normal wear
The wear part of the throwing surface presents a centrally symmetrical arc-shaped wear depression. When the remaining amount of the wear-resistant insert is less than 3mm after wear, it needs to be replaced in time.
(2) Side wear
The thrown surface presents a mid-circle arc-shaped wear depression, and the wear part is upper or lower. When the remaining amount of the wear-resistant insert is less than 3mm, it needs to be replaced in time. At the same time, it is necessary to adjust the angle of the guide plate and the thickness of the accumulated material in the crushing cavity to completely solve the side wear.
(3) Cracking or rupture of the throwing head
Replace the cracked or broken throwing head in time, and check whether there is iron in the feeding, excessive feeding force or sand in the assembly surface, etc., and adjust and clean up in time to avoid similar situations.
Note: When the matching ejection head on the rotor is worn to the replacement standard, the rotor ejection head assembly must be replaced. It cannot be replaced in a single piece, otherwise it will affect the rotor dynamic balance.
VSI Sand Making Machine
2. Wear analysis and maintenance methods of upper and lower wear plates
(1) Wear of the inner surface of the wear plate
Gully wear occurs from the inner surface of the wear plate to the discharge port, and the wear plate must be replaced when the thickness allowance of the wear plate at the largest wear point is less than 3mm.
(2) Abnormal wear of upper wear plate
Mainly due to the serious wear of the feeding barrel and the feeding hole sleeve, it is necessary to check the wear of the feeding barrel and the feeding hole sleeve and replace it (replace when the inner edge of the upper wear plate is worn to 3mm), and observe the rotor throw The wear position of the material head is determined whether it is affected by the installation position and angle of the guide plate.
(3) The lower wear plate wears too fast
It is necessary to check the wear of the distribution plate in a targeted manner. The wear of the distribution plate will directly increase the wear rate of the lower wear plate (the maximum wear thickness of the distribution plate is less than 3mm or the top of the fixing bolt must be replaced when it starts to wear), At the same time, observe the wear position of the rotor tip to determine whether it is affected by the position of the guide plate and the installation angle.
3. The rotor body wear analysis and repair standards
The wear of the rotor body is mainly reflected in three aspects: top edge wear, bottom edge wear and inner wear. It needs to be repaired periodically by hand, following the principle of "small frequency compensation".
3.1 Wear analysis
(1) Wear on the top edge
The wear of the top edge of the rotor must be accompanied by excessive wear of the top wear plate. The top wear plate needs to be replaced before it wears to the rotor body.
(2) The bottom edge is worn
The wear of the bottom edge of the rotor may be caused by the angle of ore deposits at the bottom of the rotor rubbing against the lower part and the edge of the rotor. Therefore, ore deposits in the lower part of the rotor should be reasonably reduced.
(3) Inside wear
Wear usually occurs when the feed is finer or the material has high fluidity. The material will cause streamline wear on the gap or edge between the wear plate and the rotor body. It is necessary to use urethane sealant to adjust the gap after the wear plate or the throwing head is installed.
3.2 Repair standards
The repair of the worn parts of the rotor is mainly divided into two parts: the repair of the wear part and the surface hardening repair of the wear part. Welding repair operations are not allowed in the equipment assembly and on the balance machine.
(1) Repair of worn parts
The welding rod of the same material as the rotor body is used, and the repair is carried out according to the original size of the rotor.
(2) Surface hardening repair
The hardening repair of the worn part of the top edge only needs to be hardened on the outer edge based on the repair of the worn part. The thickness is ≥5mm, the thickness of the lower surface hardening layer is ≥2mm, and the radial hardening repair length is ≥20mm. The bottom edge wear requires welding repair and hardening treatment on the upper and lower surfaces and sides of the rotor bottom. After repairing, ensure that the rotor dynamic balance remains unchanged.