Weighing scales – With weigher loading or unloading means
Reexamination Certificate
1999-09-07
2001-12-11
Gibson, Randy W. (Department: 2859)
Weighing scales
With weigher loading or unloading means
Reexamination Certificate
active
06329613
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a conveyor system which provides an accurate and reproducible weight measurement of a material transported by a continuous conveyor belt.
2. Description of the Prior Art
There is a current need for measuring the weight of a material being transported on continuous conveyor belts. When the transported material is of a granular nature, such as grain, ore, coal and crushed aggregate etc., a belt speed, a flow rate of the conveyed material, a tension of the belt, an orientation of the weigh rollers, and an angle of the conveyor belt with respect to a level plane are all important factors in affecting the accuracy and reliability of weight measurement of the material. The disadvantage of present conveyor belt weighing systems is that they must be recertified whenever they are moved to another job site.
SUMMARY OF THE INVENTION
In one aspect of the invention, there is provided a conveyor system for continuous conveying and accurate weighing of a bulk material. The conveyor system comprises a frame, at least one continuous conveyor belt positioned on the frame including an upper portion and a lower portion moving in opposite directions. A drive system is mounted on the frame to rotate the belt, and a plurality of frame rests are mounted on the frame to support the frame relative to a ground surface. The frame includes a first portion and a second portion. Said frame second portion includes a support frame. A plurality of support roller assemblies and a plurality of return rollers are transversely situated on the support frame in a spaced apart parallel relationship. A weight station is located between a pair of the support roller assemblies, between an inlet end and a discharge end. A drive pulley is located at one of the ends and an idler pulley is located at an opposite ends. The first portion of the frame includes a generally planar base, a plurality of frame supports projecting substantially upwards from the base and connected to the second portion of the frame. The conveyor belt is disposed about the support roller assemblies, the weigh station, the idler pulley, the drive pulley, and the return rollers. All of the components of the conveyor system are integrated as a single unit and the conveyor system is thereby portable.
In a preferred embodiment, the second portion of the frame is inclined at a predetermined fixed angle relative to the first portion of the frame. A series of adjustable jacks are attached to the first portion to facilitate a true horizontal positioning thereof. A pair of wheels and a trailer hitch are mounted on the first portion of the frame to facilitate mobility and transport of the conveyor system.
In a further aspect of the invention, the conveyor system may be used as a second link between a device to crush aggregate material and a stacker, whereby the crushed material may be piled in a substantially 360° arc around the crusher.
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Chari Santosh K.
Gibson Randy W.
Orange & Chari
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