The main purpose of the roller crusher is to crush the material. It is also widely used in some stone production lines. It is suitable for crushing medium and high hardness in industrial sectors such as cement, metallurgy, chemical industry, electric power, coal, building materials and refractory materials. materials.
After the roller of the roller crusher is normally worn, the surface of the roller is not cylindrical, and a concave profile with two large heads and a small middle is formed. At this time, the larger mud or mud group may pass through the worn notch, and the crushing effect is not obtained, so the roller needs to be repaired. There are two methods commonly used for roller repair: in-situ cutting (grinding) machining repair and in-situ overlay welding repair.
(1) In-situ cutting (grinding) processing method The in-situ cutting (grinding) processing method is to install a special tool holder on the frame of the crusher, and the movement path should be related to the roller. The axes are parallel. When the repair is started, the crusher is started, and the roller is cut by a manual feed mechanism (conditional automatic feed mechanism can also be used). The following points should be noted when applying this method:
1 The trajectory of the tool holder is parallel to the axis of the roller to avoid taper after cutting and affect the crushing effect.
2 Control the speed of movement of the roller. The line speed of the surface of the roller should not exceed the allowable cutting speed of the cutting tool, otherwise the speed reduction measures should be taken to avoid damage to the tool.
3 For high-hardness rolls, the cutting cannot be processed. In this case, the grinding head can be ground by the cutting method.
(2) In-situ overlay welding In-situ welding is the welding filling at the worn notch. This method is simple and practical, does not affect the production, and the hardness and wear resistance of the surfacing part are relatively good. The disadvantage is that it is only suitable for rollers with good weldability (such as cast steel rolls). Pay attention to the following matters during surfacing:
1 stack electrode selection should be appropriate, to use heap 256 and heap 266 is appropriate.
2 should choose small-diameter welding electrode, small current welding specification, layered surfacing. This reduces thermal stress and avoids severe deformation and cracking.
3 During the surfacing process, the surfacing part should be inspected frequently with a straight-line model to ensure that the dimensions are qualified.
4 The grounding of the welding machine should be placed directly on the roller, not on the shaft, so as to prevent current from flowing through the rolling bearing, causing sparks, causing the bearing rolling elements and the surface of the raceway to burn.
In addition, it is also possible to use the post-removal repair method, which is to completely disassemble the roller shaft together, and after being repaired by turning, it is installed on the machine.
Planetary Screw Barrel,Planetary Screw Cylinder,Planet Screw And Barrel,Planetary Screw And Barrel
Zhoushan Jinmao Machinery Manufacturing Factory , https://www.jinmao-machinery.com