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MPM's Automatic Pendulum Return System
on a 700 ft-lb Machine
|
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MPM's Automatic Pendulum
Return System on a Tabletop
Machine
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Introduction
Pendulum impact tests require latching of the pendulum at
the desired release angle (typically 135 degrees). For large capacity test
machines (100 ft-lbs to 300 ft-lbs), this operation requires considerable
strength to raise the hammer above eye level. After the impact event, it is
common practice in some laboratories to step into the swing path to catch the
hammer on the return swing and manually return it to the latch position. This
practice is dangerous and can result in serious injury. While the danger is
less with smaller capacity tabletop machines, there are cases, such as in
nuclear hot cell testing, where it is not possible to have access to the test
machine for manual operations. In these situations and with the larger
capacity test machines (400 ft-lbs to 700 ft-lbs), the automatic hammer
return system is a necessity.
System Operation
The MPM hammer return system hardware consists of a
clutch, brake, and motor. The system is interfaced with an optical encoder
that is mounted on the bearing shaft to continuously
monitor the angle of the pendulum. The motor may be applied at any time to
raise the hammer to any desired latch position. During a
routine test, the hammer is released, and at the optimum position on the back
swing, the system initiates the clutch and the motor is applied to return the
pendulum to the latch position. The hammer release and brake are controlled
by a console switch and/or the ImpactTM v4.3 software. An
important safety feature of the system is that electrical power must be
present for the hammer to swing, an inherent fail safe design.
Further, the test machine enclosure door is interlocked so that it is
impossible to release the hammer when the door is open. This safety feature
is very important in most applications, particularly in student laboratories
or factory floor settings where untrained personnel are present.
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