Altec DRM 12, Руководство пользователя

Страница: 75 / 143

12
Appendix — Glossary
rotary joint — a multiple port manifold that has a rotating portion and
a stationary portion, used to provide a continuous hydraulic connection
between rotating and stationary hydraulic lines. Commonly used at the
centerline of rotation of units equipped with continuous rotation.
rotate frame — the structure located above the stationary frame on a
pressure digger that is used to support and rotate the slide frame.
rotating platform — a platform which can be rotated about a vertical
axis to change its position in relationship to the boom tip.
rotation bearing — the rotating member, usually a shear ball bear-
ing, located between the pedestal and the turntable which allows the
turntable to rotate and which contains gear teeth that mesh with the
rotation pinion.
rotation chain — a chain attached to the stationary frame of a pressure
digger that is used by the rotation gearbox to rotate the rotate frame.
rotation gearbox — the gearbox which drives the rotational motion
of the turntable.
rotation pinion — the gear on the output shaft of the rotation gearbox
which meshes with the rotation bearing gear teeth and drives the
turntable rotational motion.
rotation resistant wire rope — wire rope which is constructed to resist
the tendency to untwist or rotate when carrying a suspended load. This
is accomplished by laying the outer strands in the opposite direction
to the lay of the inner strands or core.
rotation system — the system which drives the rotation of the turntable
about the centerline of rotation. It typically consists of a rotation bearing,
rotation gearbox, hydraulic motor, and load holding valve.
rpm — revolutions per minute.
running torque — the torque produced by a rotating device such as
a motor or gearbox at a specified rotational speed.
SAE
— Society of Automotive Engineers.
safety belt — see body belt.
safety chains — the chains that are attached to the trailer tongue with
hooks on their free ends. These chains keep the trailer connected to
the tow vehicle should the coupler or hitch ball detach from the tow
vehicle. Safety chains must be secured every time you tow.
saybolt universal viscosity — A measure of viscosity equal to the time
it takes in seconds for 60 milliliters of fluid to flow through a capillary
tube in a Saybolt universal viscosimeter at a given temperature.
scissor link — the mechanical linkage on a reel lifter used to connect
the lifter cylinder to the arm.
screw anchor — a rod with an eye on one end and auger flighting on
the opposite end. It is designed to screw into the ground and serve as
an anchor to hold an attached cable such as a guy wire.
seating in — an initial microscopic surface deformation of components
that are clamped together with threaded fasteners. This causes a slight
reduction in the dimension of the components, reducing the clamping
force applied by the fasteners.
secondary stowage DC pump — a low flow hydraulic pump driven by a
direct current electric motor. This pump is used to provide hydraulic flow
to stow the unit when the system for normal operation has failed.
secondary stowage system — those components used to stow the
unit when the system for normal operation has failed.
selector switch — a switch which is used to direct electrical current
to one of two or more electrical circuits.
selector valve — a valve which is used to direct hydraulic fluid to one
of two or more hydraulic circuits.
self feed — a wood-chipper with no control of the infeed rate to the
cutting mechanism.
self-locking nut — a nut which contains a built-in device or shape to
increase thread friction so as to resist loosening due to vibration or
repeated loading.
self-lubricating bearing — an antifriction bearing in which lubricating
material is incorporated in the bearing.
sense line — a line that carries a hydraulic pressure signal from a
valve or actuator to the compensator control on a variable displace-
ment pump.
sense selector valve — a valve which prevents hydraulic fluid in
the sense line from reaching the pump until a certain function(s) is
operated.
sequence — 1: the order of a series of operations or movements. 2:
to divert flow to accomplish a subsequent operation or movement.
sequence valve — a pressure operated valve that diverts flow to a
secondary actuator while holding pressure on the primary actuator at
a predetermined minimum value after the primary actuator completes
its travel.
sequential extension — the operation by which one boom section
in an extendible boom assembly reaches full extension or retraction
before the next boom section begins movement.
set screw — a short screw, typically with an Allen type head, that is
used as a clamp to bind parts together.
shackle — see clevis.
shear — an action or stress resulting from opposing applied forces that
attempt to separate a part into two pieces that would then slide along
each other in opposite directions along the plane of separation.
shear ball bearing
— an antifriction bearing with rolling ball contact
in which the direction of load transmitted through the balls is parallel
to the axial centerline of the bearing, producing shear loading on the
balls. The bearing can support axial, radial, and tilt loading. Commonly
used as a rotation bearing.
shear pin — a replaceable pin which prevents motion between two
adjacent parts by the production of shear loading in the pin, and which
may be designed to fail under overload to protect other parts.
shear stability — resistance of a hydraulic fluid viscosity index improver
additive to shearing.
shearing — molecular damage or breakdown of the viscosity index
improver additive in hydraulic fluid. Shearing can occur when the fluid
flows through fine clearances at high velocity. Shearing can cause
permanent loss in fluid viscosity.
sheave — a grooved wheel used to support and guide a winch line
or leveling cable at a point of change in the direction of motion of the
line or cable.
sheave height — the vertical distance from ground level to the centerline
of the boom tip sheave in a digger derrick upper boom tip.
short circuit — an inadvertent path of low resistance established
between two points of an electrical circuit. A short circuit will result in
excessive current flow.
shutoff valve — a device which is used to stop hydraulic fluid flow.
shuttle valve — a three-port valve that accepts hydraulic fluid pres -
sure from two inlets and allows only the highest pressure fluid to pass
through it to a single outlet while keeping the inlet fluid pressure isolated
from one another.
side gun — a hand held water nozzle and hose that can be used from
the ground for washing or fire fighting.
side load — an external horizontal load placed on a boom from one
side.
side load protection system — the system on a digger derrick that
helps prevent damage to the digger derrick structure when excessive
side loads are applied to the booms.
side-mounted platform — a platform which is attached to a mount-
ing bracket that extends from one side of the boom tip, positioning
the platform (and platform rotation pivot, if so equipped) beside the
boom tip.
sideslip — sideways motion of a component caused by an externally
applied sideways force which overcomes resistive forces from hy-
draulics, friction, etc. Commonly used to describe rotation of a digger
derrick boom caused by side loading which exceeds the side load
protection setting.
signal — a command or indication of a desired position, velocity, flow
or pressure.
signal line — see sense line.
single-acting cylinder — a cylinder in which fluid pressure can be ap -
plied to move the rod in only one direction. Return motion is produced
by an external force such as a spring or gravity.
single elevator — an elevator lift with one load carrying arm. The
single elevator system includes a lower pedestal, arm, arm cylinder(s),
parallel links, and upper pedestal.
single handle control — a control, with an interlock trigger incorpo -
rated in the handle, which allows the operator to simultaneously control
multiple functions of the booms and turntable from the platform.