When the hammer crusher is working, the plate hammer is mainly responsible for the high-speed impact on the material. The direct contact with the material and the high rotation driven by the rotor. Which are prone to looseness, so it needs to tightene.
1. Insert fastening method
The hammer crusher is inserte into the groove of the rotor from the side. And the two ends to be positione with pressure plates, which can prevent axial movement. Because the fastening bolts are remove, the reliability of the plate hammer is improve. The centrifugal force generate by the hammer head rotation and the reaction force during impact crushing are use for fastening and self-locking, and the rotor is easy to be worn and made into a replaceable structural form, so the assembly and disassembly are simple and the production is simple. The metal utilization rate of this method is low, but the improve fastening method uses a slotted hammer with longitudinal grooves on the hammer surface, which greatly reduces the metal consumption rate. The working surface can also be use for four times, and the ground is extend. The service life of the blower is improve.
2. Wedge fastening method
The method is mainly to insert the wedges into the corresponding slots between the hammer, and the rotor to tighten them. The wedge tightening method is more reliable and convenient to load and unload. Due to the relative displacement between the blow bar and the rotor, the wear of the rotor is reduce. It can greatly reduce the degree of wear of the blow bar and the rotor, but the utilization rate of the metal may be low.
3. Bolt tightening method
The method is to fasten the blow bar to the blow bar seat of the rotor by means of bolts. The hammer seat has a tenon shape, which can use the tenon to withstand the impact of the hammer during work, avoid the bolts from shearing, and improve the reliability of the bolt connection. The bolts must be tightene twice, one is the initial tightening. The initial tightening is tightene to 60-80 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 torsion shear type high-strength bolts should be screwe out of the torso clip head during the final tightening.