13 Jun Types Of Conveyor Chain
Precision conveyor chain, like transmission chain, consists of a series of journal bearings held in precise relationship to each other byconstraining link plates. Each bearing consists of a bearing pin and bush on which the chain roller revolves. The bearing pin and bush are case-hardened to allow articulation under high pressures, and to contend with the load carrying pressure and gearing action imparted via the chain rollers. There is, for each strength of conveyor chain, a range of pitches; the minimum pitch being governed by the need for adequate wheel tooth strength; the maximum pitch being normally dictated by plate and general chain rigidity. When required, the normal maximum pitch can be exceeded by the use of strengthening bushes between the link plates, and suitable gaps to clear the bushes must be provided in the wheel teeth.
INTERNATIONAL STANDARDS
Conveyor chain, like transmission chain, can be manufactured to a number of different international standards. The main standards available are:
BRITISH STANDARD – BS
This standard covers chain manufactured to suit the British market and markets where an strong British presence has dominated engineering design and purchasing. The standard is based on the original Renold Conveyor Chain design.
ISO STANDARD
Chain manufactured to ISO Standard is not interchangeable with BS or DIN Standard Chain. This standard has a wide acceptance in the European market, except in Germany. Chain manufactured to this standard is becoming more popular and is used extensively in the Scandinavian region. HOLLOW BEARING PIN CHAIN Hollow bearing pin type chain affords ready facility for fixing attachments to outer links by bolting through the hollow bearing pins and is suitable for use in all normal conditions. The attachments may be bolted up tight or held in the hollow bearing pin in a “free” manner. Bolted attachments should only span the outer link, as a bolted attachment spanning the inner link would impair the free articulation of the chain.
DEEP LINK CHAIN
Deep Link chain has sideplates with a greater depth than the normal chain plates; thus providing a continuous carrying edge above the roller periphery. When lateral flexing of the chain is required to negotiate horizontal bend radii, coned bearing pins are employed. Available in Hollow or Solid Pin versions.
SOLID BEARING PIN CHAIN
Solid bearing pin chain, while having exactly the same gearing dimensions, i.e. pitch, inside width and roller diameter as the equivalent hollow bearing pin chain, is more robust and is recommended for use where arduous conditions may be encountered.
CHAIN ROLLERS
In general, the use of chain incorporating rollers is recommended, but bush chain, i.e. chain without rollers, can be used on certain applications. Rollers of the plain or flanged type, with a choice of size and material, are listed for most chain series – size and material being dependent upon the type of application.
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