The impact crusher is widely used in the crushing of river pebbles, granite, basalt, iron ore, limestone, quartz stone and other materials, and the wear-resistant parts of the impact crusher, the blow bar is the core wear-resistant part of the impact crusher, because the blow bar is in the The impact crusher mainly crushes materials, so the design of the impact crusher blow bar should meet the requirements of reliable operation, easy loading and unloading, and improved metal utilization of the blow bar. The impact crusher blow bar is generally made of high chromium cast iron, high manganese steel and other wear-resistant alloy steel. There are many shapes, which are generally closely related to the fastening method and working load, and the commonly used ones are long strips. During the working process, the blow bar of the impact crusher is mainly responsible for high-speed impact on the material, direct contact with the material, and high-speed rotation driven by the rotor, which is prone to loosening, so it needs to be tightened. The fastening method is introduced in detail.
1. Embedded fastening method of blow bar for wear-resistant parts of impact crusher
The blow bar is inserted into the groove of the rotor from the side, and the two ends need to be positioned with pressure plates to prevent axial movement, because the fastening bolts are removed, which improves the reliability of the work of the blow bar. Utilize the centrifugal force generated when the hammer rotates and the reaction force when it hits and breaks to tighten and self-lock, and the parts of the rotor that are prone to wear are made into a replaceable structure, so it is easy to assemble and disassemble, and simple to manufacture. The metal utilization rate of this method is low, but the improved embedded fastening method adopts a grooved blow bar, and there are longitudinal grooves on the hammer surface, which greatly reduces the metal consumption rate, and the working surface can also be exchanged for four times, effectively the service life of the blow bar is extended.
2. Fastening method of blow bar wedge for wear-resistant parts of impact crusher
This method is mainly to insert the wedge into the corresponding slot hole between the blow bar and the rotor to make it fastened. The wedge fastening method is more reliable in work and more convenient in loading and unloading. Since the relative movement between the blow bar and the rotor is eliminated, the wear of the rotor is reduced. It can greatly reduce the wear degree of the blow bar and the rotor, but the metal utilization rate may be low.
3. Fastening method of blow bar bolts for wear-resistant parts of impact crusher
In this method, the blow bar is fastened to the blow bar seat of the rotor by means of bolts. The blow bar seat has a tenon shape, which can use the tenon to bear the impact force of the blow bar during work, avoid the bolts from being sheared, and improve the reliability of the bolt connection. The tightening of the bolts must be carried out in two steps, the first time being the initial tightening. The initial tightening is tightened to 60% to 80% of the standard axial force of the bolt, and the initial tightening torque value shall not be less than 30% of the final tightening torque value. The second tightening is the final tightening, and the torsional shear type high-strength bolts should unscrew the torx chuck during the final tightening. In order to make all the bolts in the bolt group evenly stressed, the initial tightening and final tightening should be carried out in a certain order.
In addition to the above fastening methods, the blow bar can be made of high-quality materials to reduce wear and looseness, and the fastening situation should be checked regularly to avoid loosening and cause equipment failure. Shanvim brings to the majority of users and friends the installation method of the impact crusher wear-resistant parts blow bar, hoping to be helpful to the majority of users and friends.
Shanvim as a global supplier of crusher wearing parts, we manufacture cone crusher wearing parts for different brands of crushers. We have more than 20 years of history in the field of CRUSHER WEAR PARTS. Since 2010, we have exported to America, Europe, Africa and other countries in the world.
Post time: Jan-12-2023