In 2013 we added a new chain length measuring machine making Donghua Limited one of only a few manufacturers to have this equipment in the UK. Designed and built by Donghua, the machine is exceptionally accurate measuring to within 10 microns per metre (a human hair is 80-100 microns) and is capable of measuring up to five metres of chain.
Donghua Limited also pre-loads (pre-stretches) chain which eliminates the initial elongation often found in built ‘in-house’ attachment chain. This means Donghua’s attachment chain is ready and easy to fit from the box and has the best possible service life.
In industries where precise positioning of more than two chains used in parallel is required, the chains need to be matched within a close tolerance of each other. With Donghua Limited’s sophisticated measuring equipment (accurate to 10 microns per metre), we can match chains from 3/8″ to 2″ pitch in both British and American standards up to a length of five metres. For longer lengths the chains can be supplied matched & tagged so they can be fitted in sequence to maintain the high length accuracy along the entire required length.
Due to advanced and precision production methods, Donghua chain is produced to very narrow tolerances and chain from the same production batches are, on average, within 1/3rd DIN standards. Using our chain length measuring machine, Donghua’s consistent and close production tolerances can be further improved and chains supplied matched in sets of +-0.5mm (5 metres). All matched chain can be accompanied by certificates of authenticity, on request.
Donghua owns two 100 tonne presses which are used to cut large pitch chains and rotary chains enabling us to fulfil growing cusotmer demand for chain in specific cut lengths. One press is used to cut special length roller chain and the other is used to cut special length leaf chain.
The Pneumatic Press Riveter is used for riveting attachment or bespoke chain to customer’s desired configuration. Maintaining uniform and consistent assembly and rivesting results, helps to increase the fatigue life of chain.
Our two 17 tonne hydraulic presses are used to cut our to order bespoke special attachment chain which is available in both British and American standards.
Donghua Limited is proud to be the only chain manufacturer in the UK to have its own hot dip lubrication bath. Once produced, the attachment chain is dipped in a metal vat containing hot lubrication which penetrates into the bearing areas that standard lube spraying would not reach. As the chain cools, the surplus lube drains away leaving an oil deposit inside the chain providing ultimate lubrication properties – this initial lubrication is the most important a chain receives and helps significantly extend wear-life. The chain is then pre-loaded, measured and matched as necessary.
Used for accurate surface grinding of chain components and sprockets.
Two new counterbalance fork lift trucks are used in the extended warehouse and workshop.
Two state-of-the-art vertical Kardex storage shuttle units are installed and a third, larger unit which holds half a tonne per tray, sits alongside them. The three shuttle units provide a unique storage and retrieval system for small chain parts used within in-house chain assembly. The units contain multiple horizontal shelves that are retrieved when the operator selects the components to fulful a customer order. Watch a video of the machines in use.
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