Understanding Drop Forged Rivetless Chain
Conveyor systems universally use drop forged rivetless chain
. Throughout the world, there are millions of feet used in several types of industrial plants. The chain gives steady reliable round-the-clock service to these industries. Approximately 90% of all overhead trolleys use conveyor chain of the drop forged rivetless sort. For the overhead trolley use, this type of chain has replaced virtually all other kinds of chain.
The three main components of the drop forged rivetless chain are center links, side links and pins. This design is so simple and the building of the chain is so simple that it allows links to be replaced in sections with no loss of time, along with this, assembly or disassembly can be done in an equally easy and rapid manner. A variety of trolleys, attachments and pusher dogs round out its components making it suitable for the specific requirements of any conveyor line.
The trolleys are the wheels that are mounted on the chain that enable it to ride on an I-beam or in a steel channel. Necessary attachments can be secured to the chain to allow parts to latch on to the conveyor line for processing. Pusher dogs are involved in key places on the system to allow specific events to take place.
The parts can be easily reversed allowing assembly or disassembly without special tools or equipment to prolong the chain's life with reduced replacement cost. Furthermore, the design and manufacture of the chain keeps disconnection while in service a thing of the past. This same design and construction makes for ease of installation. The chain is normally shipped in ten-foot chunks, which are fed into the system, and then linked to each other by turning a conveyor pin.
Drop forged rivetless chain can be used overhead, or on the floor. When used overhead, the chain hangs from an I-beam with the trolleys above, and the load below. Chain that is used on the floor is referred to as inverted, as the trolleys are below the chain, while the load rides above it. The chain is propelled by conveyor drives, which engage the chain and move it through the system. Because of its flexible design, rivetless chain will operate over irregular paths with both horizontal and vertical changes in direction.
All rivetless conveyor chains are not the same. It is the factors of metallurgy, accurate forging, precise broaching, and controlled heat-treating which give drop forged rivetless chains their qualities. Some common metals used in rivetless conveyor chain are high carbon steel, high alloy steel, and microtuff. Furthermore, several finishes, such as zinc, dichromate or black diamond, can be applied to conveyor chain to allow it to perform well in many different environments.
Rivetless chain is available in the following sizes: X698, X678, X458 and X348. The larger the chain, the heavier the load it can sustain. Heavy-duty applications will likely call for X678 chain, which rides in 6-inch track and can have an ultimate tensile strength in excess of 125,000 pounds. Light manufacturing facilities may utilize X348 chain, which goes into 3-inch track and typically has an ultimate tensile strength of less than 40,000 pounds.
Because of its capability to satisfy a broad variety of requirements, drop forged rivetless chain is the go-to chain for many manufacturing companies. No less important is its ease of use and low cost of maintenance. These factors ensure the chain to remain a major technology in several areas of the manufacturing arena.
by: Paul Timmerman.
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