Hammer hammer crusher shaft fracture analysis and processing

Hammer hammer crusher shaft fracture analysis and deal with 2019 - 10 - 18 ChanShaoRen Liu Xiancheng wei-hua song {sang pu} lei Du Lian ( Anyang China united cement co. , LTD. , henan anyang 455133). My company type 5000 t/d clinker production line adopts PCF1412 single-section hammer crusher of mixing materials such as gypsum, coal gangue, more than three years the production of the hammer has been using normal shaft. In 2014 after the modification of the production process using the crusher sandstone, often hammer shaft fracture after six months, the monthly 1 ~ 2 root fracture. Hammer shaft fracture is a safe hidden trouble in production. After technical personnel on-site observation, measurement and the hammer shaft fracture reason has the following three aspects: 1) Sandstone material granularity. Through field observation and measurement, found in the incoming material granularity sandstone accounted for 60% of 400 ~ 500 mm. Sandstone grain size is large, when the feed crusher to hammer impact, by hammer hammer axis force then. 2) Hammer hammer with axial clearance. Hammer crusher with original head wear, I company set in the tender way hammer supplies manufacturers, the bidding manufacturers provide hammer inner hole diameter & Phi; 83 mm, and the original hammer shaft diameter & Phi; 80mm。 New hammer hammer with large axial clearance, hammer head box moving during operation, axial force of hammer with the box momentum gets bigger and bigger. 3) Hammer head and the hammer plate side clearance. Hammer plate using a few years later, hammer plate and hammerhead contact flank wear, the unilateral clearance to 5 mm, each hammer head and the hammer plate clearance up to 10 mm. Hammer plate and hammerhead side clearance, cause hammer easy to reverse, turn the hammer hammer on the shaft of the additional couple. Due to large sandstone hardness, difficult to change, our company take the following measures for processing. Now, a year after processing, has been replacing hammer hammer check shaft fracture, treatment effect is very good. 1) Reduce the sandstone material particle size. The sandstone material has dropped below 300 mm maximum particle size, reduce the impact of the sandstone of hammer, hammer axis. 2) The clearance between the hammer and hammer axis. Hammer shaft diameter & Phi; 80 mm is changeless, the hammer head diameter of bore down to & Phi; 81 mm, with hammer hammer axis clearance from 3 mm to 1 mm, to reduce the momentum hammer head box, thus reducing hammer hammer on axial force. 3) Reduce the hammer head and the hammer plate side clearance. In new on the side of the hammer plate with a thickness of 5 mm steel plate gasket and the hammer plate and hammerhead single side clearance from 5 mm to 2. 5 mm, reduce the torsional capacity of hammer head, thereby reducing additional couple hammer hammer on shaft. The comparison of before and after processing as shown in figure 1. Figure 1 hammer compared with hammer plate side clearance before and after processing source: 'cement' 9, 2016