Belt bucket elevator is used for vertical conveying of powder and small particles in building materials, food, chemical, coal and other industries. The current belt bucket elevator is mainly composed of driving device, chain bucket group, belt, upper section, middle section and lower section, the lower section mainly consists of tensioning device, lower casing and lower roller group. The lower section of the belt bucket elevator is located at the feed, the running speed is faster and the dust is often larger, causing the ash leakage of the lower section of the traditional structure. In this paper, the structure of the lower roller group is improved, and the problem of ash leakage in the lower section is completely solved.
1.Analysis of the structure and defects of the original lower roller group. Most of the lower structure of belt bucket elevator is gravity or spring-tensioned, and the bearing assembly of the lower section is installed outside the lower casing. Due to the vertical adjustment of the tension, it is necessary to open a waist groove in the casing, using a guide plate with a sealing pad to seal it, and use a bead to guide the guided plate. Due to the start-top of the elevator or the influence of the feeding factors, the adaptive adjustment of the conveyor belt is frequent, the seals slide up and down, and the amount of wear is increased, resulting in poor sealing effect, fine powdery materials in the gap overflow, and ash leakage there. Because the conveying speed of belt bucket elevator is fast, the structure of NE sliding bearing is adopted, which is quick in wear and short in life.

2.Improved lower roller set.
In order to solve the ash leakage in the original lower section, a lower roller group structure is designed at belt bucket elevator in which the tensioning device and the entire roller group are installed inside the lower casing. The two ends of the lower shaft are supported by two bearing assemblies, and the tensioning device is connected to the bearing assembly. The bearing assembly slides up and down on the guide slide rail through the tensioning device, and finally seals the lower casing with a gate. The device has a compact structure and has good feasibility. The lower casing adopts such a solution, which can completely solve the problem of ash leakage in the lower section.
In order to achieve the above-mentioned solution, not only the entire bearing assembly must be placed in the dust inside the lower casing, but also the operation of the bearing assembly must be ensured under this working condition. For this reason, it is necessary to design a sealed and reliable bearing assembly.
2.1 Lubricating oil and grease filling ports are provided inside the housing. When it is necessary to add lubricating medium, the door is usually opened, and then the corresponding cleaning is performed before maintenance. Consider moving the filler poet to the outside of the housing, which makes maintenance easier.
2.2 Lubricating oil is used to lubricate the bearing. The lubrication is more thorough and there will be no local unlubricated condition. At the same time, good heat dissipation is ensured to improve the life of the bearing.
3. Improvement effect
3.1 Through the above structure, the bearing assembly is improved, so that the scheme is improved, and the problem of ash leakage is completely solved.
In order to facilitate maintenance, the filling port can be connected to the outside of the lower casing through a hose, a pipe joint, so that during maintenance, there is no need to clean the filling port, which can improve the efficiency and reliability of belt bucket elevator.