Belt bucket elevator bottom roller set of seal structure improvement

Belt bucket elevator 2020 - lower roller set of sealing structure improvement 03 - 23 Zhang Yingliu rosy clouds jin xin bin ( Wuhu, anhui province, wuhu lifting transportation machinery co. , LTD. , 241080; Anhui university of engineering school of mechanical and automotive engineering, anhui wuhu 241000). Belt bucket elevator in the building materials, food, chemical industry, coal and other industries for vertical conveying powder and small particles in the material. The belt bucket elevator is mainly composed of driving gear, chain bucket group, tape, the upper section, central section, the lower section and other parts, the lower section is mainly composed of tensioning device, the lower casing, the lower roller group, etc. Belt bucket elevator bottom section is located at feed, run faster, the dust is bigger, often make the structure of the traditional lower segment ash leakage phenomenon. In this paper, the structure of the lower roller group was improved, ash leakage problem completely solved the lower section. A, the lower part of the original cylinder group structure and defect analysis, most of the belt bucket elevator bottom structure as shown in figure 1. The class structure adopts gravity or spiral spring tensioning, the lower section of the bearing components are installed on the casing external, due to the tension adjust up and down, need to open type waist slot in the chassis, with gasket seal of guide plate, guide plate to make use of layering. Due to hoist the start-stop or feed factors, lead to adaptive regulation of conveyor belt is frequent, sealing mat down, wear volume increase, leading to poor sealing effect, clearance of fine powder material overflow, there appear grey. Due to the lower belt bucket elevator conveyor speed faster, using sliding bearing structure of the NE, prone to scream, wear fast, short service life. Second, the lower part of the improved roller group to solve the lower section of the ash leakage, we design a tensioning device and the entire cylinder installed on the bottom to the bottom of the cylinder within the case group structure. Improved drum of the lower part of the group structure as shown in figure 2, the lower part is supported by two bearings components on both ends of the shaft, tensioning device connected in bearing assembly, bearing assembly in guide slide up and down through tensioning device, the lower casing with door finally sealed. The device structure is compact, has good feasibility, lower shell adopting such a scheme, can thoroughly solve the problem of the lower section of the ash leakage. To implement the above scheme, not only to the bearing components whole put in lower dust within the case, and under such conditions to ensure the operation of the bearing components. Obviously, bearing component of sealing determines the improvement scheme is feasible. To this end, we designed a kind of reliable sealing bearing components, its structure as shown in figure 3. ( 1) Adopt double lip seal and a VD shape rubber sealing ring, form a labyrinth cavity. By way of VD shape rubber sealing ring set the first dust; In bearing, a sealing cover straight through pressure oil cup and filling flow channel, make the lip seals and cavity is formed between VD shape rubber sealing ring, easy to inject grease. Cavity filled with grease form of the second dust, can effectively block the dust; Cavity filled with grease in the lower shaft rotates, between two lip seals is filled to a small amount of grease, form the third dust. Through setting, the layers of dust is difficult to enter the bearing chamber, the reliability of sealing. ( 2) In made up of cap, bearing seat right cavity, a charging port and lubricating oil filling mouth, through filling the mouth, add lubricating oil to right chamber, make sufficient lubrication of the bearing, lubricating oil at the same time the left cavity of grease and oil seal and sufficient to prevent oil leakage. In order to ensure the sealing is reliable, between bearing, sealing cover and the cap with sealant, prevent oil spills. ( 3) Lubricating oil and grease filling mouth are set in the interior of the shell, need add lubricating medium, usually open the door, and then accordingly after cleaning, and maintenance. Can consider to will be loaded with mouth to the external shell, so more convenient to maintain. ( 4) Of the bearing by lubricating oil lubrication, the lubrication more thoroughly, there will be no local without lubrication, at the same time ensure good heat dissipation, can improve the service life of bearing. Third, improve effect ( 1) Multiple labyrinth design, can completely block the tiny dust particles into the bearing chamber. ( 2) Through the above structure, to improve the bearing components, make the plan implemented, ash leakage problem completely solve. ( 3) Using oil as lubricating medium, the advantage is more, but the cap, and the end face of the bearing need to grinding, avoid oil leakage. ( 4) For ease of maintenance, filling the mouth can be through the hose, pipe joints, such as connecting, moved to the bottom shell of the external, so that maintenance, do not need to clean mouth filling, improve the efficiency of maintenance and reliability. ( 5) Lower roller components installed on the bottom inside the casing, make the lower shaft shorter, equipment structure is compact and the economy. The sealing structure of the actual project application installed, run two average fails, we later for other enterprises to carry out the same technological upgrading, received good feedback. Source: 'cement' in 2019, no. 2