The height limiter for the accessories of a single beam crane plays a crucial role in ensuring the safe operation of the crane. Below is an explanation of its function and working principle:

Function

The primary function of the height limiter is to prevent the crane hook or load from exceeding a specified maximum height during operation. This is particularly important to avoid collisions with overhead structures, such as the crane runway or building ceiling, which could cause damage to the crane, load, or surrounding area.

Working Principle

The height limiter typically operates based on a combination of sensors and control systems. Here's a detailed breakdown of its working principle:

Sensor Mechanism:

The height limiter is equipped with sensors that detect the vertical position of the crane hook or load.

These sensors can be mechanical, electrical, or optical, depending on the specific design of the crane.

Signal Transmission:

When the hook or load reaches a predetermined maximum height, the sensors transmit a signal to the control system.

This signal can be in the form of an electrical pulse, a mechanical switch closure, or an optical signal.

Control System:

The control system receives the signal from the sensors and processes it to determine if the maximum height has been reached.

If the maximum height is exceeded, the control system will activate the braking mechanism or other safety devices to stop the crane's upward movement.

Braking or Safety Devices:

Upon receiving a signal from the control system, the braking mechanism or safety devices will engage to stop the crane's movement.

This may involve activating electromagnetic brakes, mechanical brakes, or other safety devices designed to prevent further upward movement.

Alarm or Indication:

In addition to stopping the crane's movement, the height limiter may also activate an alarm or indication light to alert the operator of the situation.

This helps to ensure that the operator is aware of the potential danger and can take appropriate action to address it.

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