Screw Conveyor Flight Design Calculation2020-03-12

Summary:Screw Conveyor Flight Design Calculation Due to the production characteristics of the cement and mining industries, raw material mines are often far away from the main production plant. With the maturity of the manufacturing technol…

Screw Conveyor Flight Design Calculation

Due to the production characteristics of the cement and mining industries, raw material mines are often far away from the main production plant. With the maturity of the manufacturing technology and design concept of long-distance conveyor Screw Conveyors, Screw Conveyors of several kilometers, dozens of kilometers or even tens of kilometers are increasingly used in cement plants. The Screw Conveyor is suitable for a wide range of materials. Limestone, raw coal, clinker, sandstone, clay and other block materials in the cement plant can be almost all conveyed by the Screw Conveyor.

When designing a long-distance Screw Conveyor, it is usually necessary to combine the reasonable layout of the main components such as terrain, driving, turning and tensioning to ensure the normal operation of the equipment and also take into account the needs of power supply, distribution and maintenance. This is the focus of design work and difficulty.

1, Overall layout

Due to the long conveying distance of long belts, and the terrain is complicated outside the production area, it will inevitably bring many unexpected difficulties to the process layout. Therefore, the process layout of the long belt is the most important step in the design of the long belt, which directly affects The investment cost of long belts, the difficulty of project construction, and subsequent production operation and maintenance.

The overall layout of the regional layout plan should be based on the geographical location of the long belt feed and discharge points to choose the nearest and less undulating route. In the layout area, high-voltage lines, oil pipelines, densely populated residential areas, highways, railways should be avoided. And other impacts; in actual engineering construction, it is often impossible to take into account all problems, so it is necessary to divide the long belt into two or more leather belts to achieve. The height of the corridor should meet the clearance requirements. Avoid high supports and arrange along the terrain as much as possible to reduce investment and operating costs. At the same time, when the conveyor belt is closer to the residential area, the Screw Conveyor corridor needs to adopt a closed design to reduce the impact of Screw Conveyor noise on the environment of sensitive areas.

2, Drive arrangement

The driving device of the long belt is very different from the ordinary belt. The ordinary belt driving device generally adopts a single drive, a low-voltage motor, and the head wheel as the driving roller. The descending Screw Conveyor can use the tail wheel as the driving roller. The drive of the long belt is generally double or multi-drive, and most of them are high-voltage motors. Considering the layout space and easy maintenance, the drive can be arranged on the ground below the Screw Conveyor, near the head or tail of the Screw Conveyor, which is convenient for adjacent Screw Conveyor Centralized power supply, head wheels and tail wheels are only used as redirecting drums.

3, Flip device arrangement

The Screw Conveyor turning device is to turn the conveyor belt that has passed around the head drum so that its working surface is facing up without contacting the lower supporting roller. Before the tail roller is bypassed, it can be flipped and reset again, which can avoid the scrap of the conveyor belt on the ground when the lower supporting roller is in contact with the working surface of the conveyor belt, affecting the working environment and saving the manual cleaning workload. Generally used on long belts, the longer the conveying distance, the more significant the economic benefits.

In the layout plan of the long belt, it is necessary to consider a space for the arrangement of a set of turning devices at the head and the tail of the long belt. Each turning device needs about 30m to 40m and must be closed.

4, Tensioner arrangement

The function of the tensioning device is to tension the conveyor belt so that it has the working tension required to ensure normal operation, and also compensate the elastic extension of the conveyor belt. The tensioning device of the long belt is mainly determined according to the different forces caused by the belt direction and the layout space of the surrounding site. There are many choices, such as: fixed winch tension, self-controlled hydraulic tension, double hammer tension, heavy hammer car type (fixed sheave type, tower sheave type) tension and combined tension. The position of the tensioning device in the long belt is generally close to the driving roller, so that the reaction time is the shortest and the tensioning effect is the best.

The design of the long belt is a complicated system engineering and involves many aspects. This article mainly introduces the technical layout of the long belt. In the calculation of the specific force, it needs to be carefully analyzed in combination with the situation on site.

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