1. Mechanical limiting device
Structure and principle
The mechanical limit device is usually composed of a limit block, a stop block or other mechanical structure. For example, in a simple linear guide system, stop blocks are installed at both ends of the guide. When a moving part, such as a slider, moves along the rail and comes into contact with the limit block, its movement is stopped. This barrier is achieved through physical contact, using collisions and friction between solids to limit movement.
In the case of a crane, a mechanical limit device is provided on the path of extension and retraction of the crane boom. When the boom is extended to the maximum safe Angle or retracted to the minimum safe position, the stop rod in the limiting device will collide with the contact component on the boom, thereby preventing the boom from going out of the safe range.
Application scenario
In machine tool processing, mechanical limit device is widely used. For example, the limiting device is set on the movement direction of the workbench of the milling machine, which can ensure that the workbench will not exceed the processing range of the machine tool during the processing process, avoid the collision between the tool and other parts of the machine tool, damage the tool and the machine tool, and ensure the processing accuracy.
Lifts in building construction also have mechanical limiting devices. When the elevator car rises to the highest floor or falls to the lowest floor, the limit switch (mechanical part) will trigger, so that the elevator stops running, ensuring the safety of passengers and equipment.
Advantages and disadvantages
Advantages: mechanical limit device has simple structure and high reliability. It does not require complex electronic components and control systems, and can still work stably in some harsh working environments (such as high temperature, high humidity, strong electromagnetic interference, etc.). For example, in the metallurgical industry, hot rolling mill equipment is around due to the environment
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