Increasing the friction between the crusher roller and the residual pole and expanding the angle of the crushing jaw can make the residual ball block with larger spherical diameter enter and crush. Therefore, the welding flakes with a width of 30 mm and a height of 10 mm are piled up at intervals of 100 mm on the surface of the light roller. After the residual mass enters the crushing chamber, it is chopped under the action of the tooth surface, and the angle of the crushing jaw is increased, and the average grain can be obtained. The diameter (6070mm) is relatively large and the residual pole is broken.
The welding roller surface is made by manual arc welding, and the surface of the double-roller crusher is surfacing. The main points of surfacing are as follows.
(1) D-65, D-667 and 506 welding rods are selected. Before welding, according to the instructions for welding rods, the welding rods are dried and placed in the incubator for use.
(2) Clean the fatigue layer of the roller surface, clean it with carbon arc gouging, and plan the fatigue layer of the roller surface to expose the roller to the base material layer.
(3) Use a DC welding machine, which must be reversed (the welding rod is connected to the positive electrode). When surfacing, the AC welding machine requires a no-load voltage of 70V, and the current is controlled at about 200A. If the no-load voltage is lower than 70V, the current should be increased, which is based on the full fusion of the electrode and the base metal. The ratio of the width of the weld bead to the height is preferably 31.
(4) After preheating the roll surface, firstly use the 506 electrode (alkaline electrode, suitable for welding 16M material, cheap, and well bonded with the base metal) to weld 13 layers of carbon steel, and round the roll. Then evenly weld several layers of D-667 (high-chromium cast iron surfacing rod can withstand high impact and wear resistance, hardness HRC48 after welding, good wear resistance, corrosion resistance and cavitation resistance below 500 high temperature) There should be thickness. After the D-667 weld layer is surfacing, a layer of D-65 (high-alloy surfacing rod Cr-Si-Mo-B high-corrosion cast-iron wear-resistant surface wear-resistant electrode can be surfacing. It can withstand low impact. Resistant to strong abrasive wear, the advantages of this electrode are good surfacing, no slag after welding, high wear resistance. Hardness after welding HRC60. Improve wear life 310 times), thickness of surfacing is 35mm. Wear layer The thickness stress is uniform so that the squeezing roller remains circular during use.
3 Conclusion
Through production practice, the average particle size of the residual electrode of the crusher is increased from 40mm to 60mm at the time of design, which reduces the production load of the upstream equipment, improves the adaptability to the roller crusher, and the service life of the roller crusher reaches 10 In the month, the broken residual pole totaled 50,000 tons.