Republished online as part of World Coal's Handling Week, Waldemar Wójcicki,
To read the full article
"Working in tight spaces"
Please sign in or become a member for FREE
Belt conveyors for underground mining have to have a more compact design than those for overland conveyors, adapted as they are to the limited space available underground. The tight space restraints also
As a result, the drives used underground are necessarily smaller than those used above ground. This article will provide an overview of such small drives and their potential application.
The drum motor
In this type of drive, the drum casing also serves as the housing for a gear unit and a motor that are placed inside the drum. The torque is transferred to the drive construction by fixing the drum axis end with pivots at both ends. The supply voltage is introduced into the drum through the axis.
The power of such a drive is limited to several dozen kilowatts due to the following factors:
- A geared motor is rigidly connected without a flexible or hydraulic coupling.
- There may be a problem with
dissipationof heat from the drum.
- The possibility of reaching a suitable torque is limited.
The construction of the drum motor type of drive is
Another disadvantage of placing the motor and the gear inside the drum is the large quantity of lubricant required within the casing, as the gear usually has an open construction and the oil simultaneously lubricates the cogwheels, low-speed coupling and the drum bearing on the axis. This causes problems with sealing the unit, as well as the need to remove all lubricants each time the gear or motor is repaired.
The drive with a gear coupled
with the drum
The construction of this drive includes a two-stage cylindrical drive gear, where the second-stage wheel is set on the drive drum shaft in the side wall of the drive. The gear unit housing is bolted to the side wall, comprising the remaining gear wheels. High-speed coupling,
The fundamental problem in the operation of such a drive comes in ensuring a high stiffness of the drive
Drive drum with an internally mounted motor and gear
A 1992 article entitled ‘Kleinbauende Antriebe für Gurtfoerdereranlagen’ presented a construction of the
FCD 315 compact drive
The FCD 315 compact drive was created as part of the efforts of conveyor designers to obtain a device to meet the demands of users to provide high power in haulings of high-performance walls, as well as in beam stage galleries, without having to use substantial cross-section areas of the housing.
The FCD 315 conveyor drive has a drive drum in the form of the drum casing mounted on two fixed sleeves. The drive unit placed inside that casing, consisting of a motor, a
In order to ensure easy introduction of a new product into operation, it was assumed that its design should be compatible enough with existing designs. For this reason, the FCD 315 drive has been built into the casing, which is compatible with the dimensions of conventional drives.
As the drive drum does not have to be mounted in the stiff casings, a mounting unit can be used, using a handle that can be mounted in a suitable manner, thus creating applications that guarantee implementation of the drive basic tasks, including dimensions minimisation.
This is an excerpt from an article that was first published in World Coal November 2016. To register and receive your free trial of the magazine, click here.
Read the article online at: https://www.worldcoal.com/handling/31032017/working-in-tight-spaces/