What is the function of safety protection device of crane?
Crane as a special machinery, its safety is directly related to the
safety of life and property, so, in order to ensure that the crane can
work safely and reliably, "lifting machinery safety regulations"
stipulates that lifting machinery should be equipped with a variety of
safety protection devices. Below let's take a look at the crane safety
protection devices are what, each of them have what role.
1.Overload
limiter When the crane's hoisting exceeds the rated value, the crane is
stopped, and accidents due to overloading are never avoided. Overload
limiters are widely used on bridge cranes and lifts. Some boom type
cranes (such as tower cranes, gantry cranes) use overload limiters with
torque limiters.
2.The torque limiter is composed of a load detector,
an arm length detector, an angle detector, a condition selector, and a
microcomputer. When the crane enters the working state, the detection
signal of each parameter of the actual working state is input into the
computer, after being calculated, amplified, processed, compared with
the value of the rated lifting torque stored in advance, and the
corresponding actual value is displayed on the display at the same time.
come out. When the actual value reaches 90% of the rated value, it will
issue an early warning signal. When the actual value exceeds the rated
load, an alarm signal will be issued and the crane stops to continue the
operation in the dangerous direction (lifting, extending arm,
descending arm, turning).
3.The working principle of the buffer is
that if the cart (or trolley) of a single crane accidentally rushes to
the end of the track journey, the buffer can interact with the end stop
(another safety device) of the track at the same horizontal height; If
two cranes on the same span track collide, the buffer located on the
opposite side of the metal structure of the two cranes will act. Through
its own deformation, the buffer can quickly transform the collision
kinetic energy into elastic potential energy absorption, so as to reduce
the impact of collision force and avoid damage to the crane.
4.Windproof
and anti-skid safety device This is a safety device for preventing the
crane working in the open air from sliding along the track under the
action of strong wind. The outdoor working track crane should be
installed. Its safety function is that when the crane encounters the
maximum wind force in the non-working state, the crane is not blown to
prevent the crane from tipping over at the end of the track. Common
windproof devices include rail clamps, anchoring devices and iron shoes.