Maintenance of Truck scale/weighbridge(1)
Author:jinmai Time:2017-09-13 10:33:57
Truck scale/weighbridge as a commodity trading settlement equipment and measurement equipment for production
management is more and more popular. So the workload of fault maintenance is also increasing. Daily maintenance
work is to consider the interests of the user, and to ensure the accuracy and legitimacy of measuring instruments
in use. This paper introduces a superficial experience in the maintenance work, for reference only.
Regularly Scheduled Maintenance
A thorough check-up every six months at the very minimum is the general rule. However, take into consideration
your number of weighments, climate and the value of the product being weighed. Aside from the actual calibration,
most of the inspection will consist of you or your scale technician conducting a visual inspection of the scale,
foundation and surrounding area.
Every vehicle scale should be calibrated and tested by a state-licensed servicing agent with no less than 25,000
pounds of certified test weights.
Even the toughest scale on earth is put at risk on a poor foundation. Cracked foundations can lead to movement or
settling which causes chronic calibration errors. Letting little cracks become big cracks may require removing part or
all of the foundation and pouring a new one for the scale to once again weigh accurately.
Take a look at the deck. Rust or crumbling concrete can weaken the scale's structure and cause problems.
Keep 'em smooth. Clean and paint rusted steel decks. Keep 'em shiny.
Binding is a common cause of inaccuracies. A rock as small as your big toe can become wedged between the foundation and deck.
Installing T-Strip molding between the deck and foundation can help keep debris from getting caught or falling down into the scale.
Some above-ground scales have end cleanout plates that can be removed, allowing access to clean out debris that
builds up on the foundation's surface closest to the scale's end.
Some vehicle scales utilize suspension systems that don't require checking devices,eliminating a time-consuming step in your PM protocol. If your scale has checking devices, make sure they are working properly.
Inspect check rods to make sure the attachment points are solid. Check for binding. If there is a problem,
weight readings will be inconsistent from section to section. Inspect hardware to ensure jam nuts are tight,
rods are level and free of foreign material, and washers are not rusted or distorted. Even if they are working
properly, replace corroded hardware components so they don't fail in the future.
Unlike check rod binding, bumper bolt displacement is easy to spot. Bumper bolts need to be tight so they
don't move on their own, yet maintain clearance when the scale is both empty and loaded. Seasonal
temperature and weather changes can cause concrete and steel to expand and bumper bolts can bind
tight against the contact area. If binding occurs, adjust bumper bolts to maintain proper amount of
clearance for all conditions.