Spring applied brake for outdoor applications
22 August 2012
The new INTORQ BFK471 brake from Lenze Techdrives delivers up to 1,500Nm in a package that is compact, economic and protected to IP66. This is a spring applied design that is normally engaged, and is released by applying a dc voltage.
The BFK471 is available with either one or two rotating discs with corresponding rated torque of 750/1,500Nm. Both have an outside diameter of 333mm and a maximum bore size of 65mm.
The high degree of protection from harsh environments is provided by a zinc plated casing and nitrided friction surfaces. This gives a UL recognised enclosure rating of IP66 suitable for jetted water. The brakes can therefore be used for dockside machinery, cranes, ships’ winches and general outdoor applications including bulk handling conveyors.
One particular innovation with the BFK471 brake is the hand release mechanism. Often on such large brakes the mechanism for manually releasing the torque is mechanically clumsy and requires high physical force to operate. With the BFK471 manual release the operation is smooth and efficient with low applied force. There is an option for mechanically locking the lever in a ‘brake-off’ position.
The internal air gap for the BFK471, which is a measure of wear, can be easily measured in-situ using a check bore hole. As an option a non-contacting sensor can be fitted to monitor the wear and the brake operation. Where ambient temperatures are particularly low, typically below -20 °C, a heating element can be added suiting “Cold Climate” CCV conditions.
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