Vertical shaft impact crusher is also called sand making machine. The rotor is the performing part of the vertical shaft impact breaking. The service life of the rotor wear parts directly determines the maintenance cycle of the vertical shaft impact crusher equipment and the opening probability of the equipment.

Routine maintenance is mainly to replace the wear parts and the rotor body wear welding repair, so the correct analysis of equipment wear, replacement standards and equipment maintenance methods, will greatly improve the operation of the entire equipment, prolong the actual service life.

01

The rotor body

The rotor of vertical shaft impact crusher is mainly composed of rotor body, feeding plate, feeding hole sleeve, guide plate, upper wear plate, lower wear plate and top wear plate and other components.

Routine maintenance mainly consists of regular replacement of wear parts and welding repair of rotor body wear. Equipment maintenance, operators can through the wear of the rotor parts, to determine the running state of the entire equipment.

02

Method for wear analysis and maintenance of rotor wear parts

2.1 Wear analysis and maintenance method of casting head of sand making machine

(1) normal wear.

The wear part of the discarding surface presents a central symmetrical circular arc wear depression. When the residual quantity of wear-resistant block is less than 3mm, it should be replaced in time.

(2) side wear.

The discarding surface presents a circular arc wear depression, and the wear part is either up or down. When the residual amount of the maximum wear of the wear block is less than 3mm, it should be replaced in time. At the same time, we need to adjust the Angle of the material guide plate and the thickness of the material in the crushing chamber. Thoroughly solve side wear.

(3) Cracking or rupture of the discharging head.

Replace the cracked or broken throwing head in time, and check whether there is iron in the feeding, excessive feeding force or no sand in the assembly surface, adjust and clean up in time to avoid similar situations.

When the supporting thrower head on the rotor is worn to replacement standard, the rotor thrower head assembly must be replaced. Can not selectively replace one piece, otherwise it will affect the dynamic balance of the rotor

2.2 Wear analysis and maintenance method of upper and lower wear plate

The inner surface of the wear plate to the discharge port appears gully wear, wear the largest wear plate thickness margin < 3mm, must be replaced.

Wear plate on abnormal wear mainly because of the feeding tube and the feeding hole set of wear serious, need to be targeted to check the feeding tube and the abrasion of the feeding hole set to replace (wear plate inside edge wear on when change to 3 mm), at the same time observe the rotor position extractor head wear, determine whether or not the installing position and installation Angle guide plate.

Down wear plate wear too fast to be targeted to check points and the abrasion of tray, wear points are directly will aggravate the wear rate of wear plate (maximum wear points materials plate thickness allowance < 3 mm or fixed bolt top began to wear must be replaced), at the same time observe the rotor position extractor head wear, determine whether or not the installing position and installation Angle guide plate.

03

Standard for wear analysis and repair of rotor body

The wear of rotor body is mainly reflected in the top edge wear, the bottom edge wear and the inside edge wear, which need to be repaired manually periodically, following the principle of "small repair frequency repair".

3.1 Wear Analysis

(1) top edge wear.

Rotor top edge wear must be accompanied by excessive wear of the top wear plate. The top wear plate shall be replaced before worn to the rotor body.

(2) bottom edge wear.

The wear of the bottom edge of the rotor is usually caused by the friction of the bottom deposit Angle on the lower part of the rotor and the edge of the rotor. The deposit should be reasonably reduced.

(3) Internal wear.

Wear usually occurs when the feed is fine or the material flow is large, the material on the wear plate and the rotor body installation position of the gap or the edge of the streamlined wear, need to be in the wear plate or after the installation of the throwing head with urethane sealant to fill the gap.

3.2 Repair standard

The repair of the rotor wear part is mainly divided into two parts: the wear part repair and the wear part surface hardening repair. The welding repair operation can not be carried out in the assembly of the equipment and the balancing machine.

(1) repair of worn parts.

The welding rod with the same material as the rotor body is used to repair the rotor according to its original size.

(2) surface hardening repair.

Hardening repair of the top edge wear only requires hardening treatment of the external edge on the basis of repair of the wear part. Thickness ≥5mm, lower surface hardening layer thickness ≥2mm, radial hardening repair length ≥20mm.

The bottom edge wear requires welding and hardening treatment on the upper and lower surfaces and sides of the bottom of the rotor, and the specific parameters are worn and repaired at the top edge. The rotor dynamic balance should be kept unchanged after repair.

The rotor of vertical shaft impact crusher should be inspected and measured manually periodically in the use process, and the wear parts should be replaced and the rotor body welding repair should be carried out in strict accordance with the replacement and maintenance standards.

When the thickness allowance of rotor wear parts is less than 3mm, it is necessary to stop the whole set of replacement within 8h of equipment operation, and find out the cause of wear. Rotor body repair shall strictly comply with the repair standards to ensure that the repair quality and dynamic balance meet the production requirements.