Weighing scales – Structural installation – Vehicle
Patent
1987-02-04
1989-03-07
Miller, Jr., George H.
Weighing scales
Structural installation
Vehicle
177147, 177211, G01G 1908, G01G 1914, G01G 314
Patent
active
048097942
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the determining of the amount of material delivered each operational cycle of a shovel loader. In particular the invention relates to effecting such determination in regard to a shovel loader comprising a base, a platform supported on the base for rotation relative thereto about a vertical axis, a boom connected to the platform at the lower end and at an upper portion to a stay structure mounted on the platform so the boom extends upwardly and outwardly from the platform, and a bucket supported suspended from the boom and displaceable therefrom in a vertical and horizontal direction.
It is desirable for a number of reasons to be able to determine the quantity of material delivered by a shovel loader both from the point of view of material delivered per operational cycle of the loader and total quantities over small large numbers of cycles.
Apart from ascertaining the total quantity of material moved in a day or a shift, when loading vehicles by a shovel, it is important to ensure the truck is not under or over loaded. Underloading is wasteful in regard to vehicle usage, and overloading is detrimental to vehicle wear and overall life.
It is therefore the object of the present invention to provide a method and apparatus that is effective in measuring the quantity of material delivered each operating cycle of a shovel loader, having regard to the environment in which the shovel loader operates and various factors influencing the accuracy of such measurements.
With this object in view there is provided a method of measuring the quantity of material delivered per cycle by a shovel loader having a bucket to hold the material to be delivered the bucket being movable between a loaded and unloading positions, said bucket being supported from a structure during movement between said positions, said method comprising determining the position of the bucket in respect to a selected location on said structure in the form of a processable position signal at one or more intervals during said movement, determining the load at a selected location within said structure where the load is related to the mass of the bucket and bucket contents in the form of a processable and load signal at said interval or intervals, and processing said position and load signals to determine the mass of the bucket and bucket contents at said interval or intervals.
More specifically there is provided a method of measuring the quantity of material delivered per cycle by a shovel loader comprising determining in the form of electrical signals the position of the bucket with respect to a selected location and the load at a selected location in the boom or stay structure at one or a number of intervals in the movement of the boom from a bucket loading to a bucket unloading position, providing inputs, generated by said signals to an electronic processor programmed to calculate therefrom the total weight of the bucket and contents at each interval, making further such determinations and inputs to the processor at one or a number of intervals in the movement of the bucket in the reverse direction between said position, and processing said inputs in the processor to provide a difference between the weight of the bucket during the two movements.
By determining the difference between the weight of the loaded bucket as it moves to the unloading position and weight of the empty bucket as it returns from the unloading position, the weight of the contents of the bucket actually deposited is ascertained. Preferably the processor determines an average of the weights calculated during the respective movements and provides a difference in these averages as the weight of the contents deposited by the bucket.
Conveniently the determinations are made at predetermine time intervals during the movement of the boom in each direction. The time intervals between the determinations are preferably equal.
These weight determinations may be initiated and terminated in response in suitable parameters, such as the position of the boom relative to the
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Blair James R.
Riley Timothy W.
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