Problems and Solutions with In-Motion Shackle Scales

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Oct 16, 2013

A common problem area with in-motion shackle scales is the movement of the trolley from the inbound and outbound side of the live weighment rail.

If there is no smooth transition, there can be a shock or drag action affecting the credibility of the weight average indicated.  Thus, a scale with a relatively smooth transition mechanism is highly desired.

in motion monorail scale

Heavy Duty In-Motion Shackle Scale – Front View

Location and support structure for a scale are very important areas which require attention to detail.   Brute strength is absolutely necessary in the support structure of any scale, but especially when dealing with high accuracy in-motion scales.  Elimination of an unrecognized problem such as this can be the simple solution for seemingly distorted or inconsistent weights.

shackle scale

Heavy Duty In-Motion Shackle Scale – Rear View

Along that same type of problem, where a tension transition rail is used in the scale system, the area should be frequently inspected for correct operation and the absence of any binding or grime build-up.  The push dogs of the supply chain should be free from affecting the live scale weighment while the carcass weight is averaged as it crosses the independent scale rail.  The photo eyes for starting and stopping the weight averaging process need to be accurately positioned, reflecting freedom of push dog activity.  Speed adjustment of the scale chain may be required to enhance freedom of trolley movement away from the push dog.

monorail CTA

Testing and calibration should occur on a recurrent basis. Static weight testing should occur at the three prime points of the live weight rail (Entrance rail end, Center rail, and Exit rail end).   Depending on differences, corrections can be made and accuracy often restored with the simple scale calibration action.  In addition, preventative maintenance should include inspection of the sprockets and chain for movement and lubrication.

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