Crane safety devices

  In unforeseen circumstances prevent the crane damaged devices. In addition to the commonly used crane electrical protection devices, sound signals and colored lights, there are a variety of other security devices.
Limit switch to prevent the  eot crane  various sports bodies over the limit position of the safety device. When the various sports bodies to the limit position, the limit switch is touched, thereby cutting off the power.
Buffer device and breaker failure protection device to absorb the hit when a crane or trolley seat when the kinetic energy of the terminal block. Such a device widely used in rubber, springs and hydraulic buffer, wherein the buffer is used in a hydraulic crane work or car speed is high (for example, a trolley carrying the bridge), and it can absorb a large impact energy. Also mounted on the crane in certain photoelectric protection device to prevent running on the same track of the crane of the two collide. Its simple principle (see Figure): When the two cranes close to a certain safety distance, the crane A of the light emitted by the light cast by the  Steel crane  B, receives light, generates an electrical signal by the photoelectric tube, the waveform shaping and amplification, relay, buzzer alarm and automatically cut off the power to run institutions. To install a set of two cranes, interactions.
    Windproof device prevents the crane was blown up or blown down device, there are cranes and crane rail clamp anchor. Running on the port large  hoist crane   installed on normally while rail clamp and anchor. Stop the crane rail clamp or when the wind increases to a certain level of functioning; anchor in the storm before the onset of the operation by the driver. Rail clamp windproof role as anchor.
From the weight of heavy weight lifting limiter can not exceed the specified value, there are two kinds of mechanical and electronic. The use of mechanical springs - leverage; electronic usually detected by the pressure sensor lifting weight, since when more than the allowed weight lifting mechanism will not start. Lifting limiter can also double as a starting weight indicator.
Lifting torque limiter can make  jib crane  lifting torque (lifting objects gravity and magnitude of the product) does not exceed the specified value, can simultaneously receive signals from the weight variation and amplitude variation signal. Both signals by combinatorial computing and electronic instruments amplified with hoisting and luffing mechanism electrically interlocked to prevent the crane from tipping over.
Deflection limiter span cranes (generally 50 meters or more, such as bridges and carried a large shipbuilding gantry crane) at both sides of the running speed is inconsistent, prone to deflection increases running resistance, so that the coupling bridge and legs structure to withstand additional load. At this time, normally mounted on the top of the flexible leg deflection limiter. Crane bridge and support legs can be rotated relative to the arm or the movement of gears, cams, or bump the touch control switch, when the crane reaches the maximum deflection in the amount of a certain value (usually to the crane span thousandths five thousandths) can cut off the power or automatic correction.