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 17.1.4 Inspection Interval
The inspection interval should be determined by the application of the equipment and the
environment in which it works. Inspections of self propelled box conveyors may be needed more
often because of the complexity of the system, while the selective vertical conveyor is more
rugged and less complex in design. Neither type unit should be inspected at less than 6 month
intervals.
17.2 INSPECTION OF SELF-PROPELLED BOX CONVEYOR
17.2.1 General Description
The self propelled box conveyor system is made up of an assortment of various parts that are
assembled to suit a specific application. The system could be as simple as the type shown in
Figure 17-3 or more complex as that shown in Figure 17-1. The carriers are independently
powered modules that move from a point to a selected destination by way of a track system. It is
capable of moving in both a horizontal and vertical direction. The module is powered by a series
of bus rails that are located in the track. The system is operated by establishing a destination on
the module and giving it a start signal. The module will proceed into the track system. At
various discussion points along the way, the destination is automatically read and the track path
is adjusted accordingly until the module arrives at its destination. There are several
manufacturers of this type of equipment. The basic concept is the same. However each
manufacturer has a different approach to accomplishing the result. We will try to show the
various designs as we proceed. Because there is no one standard system design, we will address
our inspection to the various components. The inspector will have to tailor his/her inspection
procedure to suite the specific system he/she is inspecting.
17.2.2 Track
17.2.2.1 Design. The system uses modular, extruded aluminum track sections. Two of the
track power rails provide 24 volt D.C. power to the module motors, while the third rail feeds
control logic commands. Horizontal car movement relies on friction drive, while vertical
movement engages gearing between the track and the module. Figure 17-4 show three basic
track designs used today.
17-4
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