Regarding the working principle of "double beam cantilever detection and variable frequency speed regulation device", it should be clarified that "double beam" here may refer to the structural characteristics of the crane, while "cantilever detection" and "variable frequency speed regulation device" are two different technical concepts, and their working principles are independent of each other. The following is a detailed explanation of the working principles of these two concepts:

1、 The working principle of cantilever detection

Cantilever detection may refer to a technique of using cantilever structures for inspection. In the field of cranes, especially double beam cranes, cantilever structures are commonly used to install sensors or detection devices for detecting the status or working environment parameters of the crane.

As for the working principle of cantilever detection, it may involve the following situations:

Deformation detection:

In some cases, the cantilever itself may serve as a part of the sensor, detecting changes in external forces through its deformation. For example, in a dual material cantilever beam sensor, when external thermal radiation is converted into thermal energy, the cantilever beam will deform due to the different coefficients of thermal expansion (CTE) of the two materials, which will drive other parts of the sensor to change and achieve information collection of the target object.

Displacement or angle detection:

Displacement sensors or angle sensors may be installed on the cantilever to detect displacement or angle changes of the cantilever. These sensors typically work by measuring the position or angle of the cantilever relative to a fixed reference point, providing information about the crane's condition or working environment.

Pressure or weight testing:

In some applications, cantilevers may be used to support or suspend heavy objects and detect the weight or pressure of the objects through pressure sensors or weight sensors. These sensors typically convert pressure or weight into electrical signals for further processing and analysis.

2、 Working principle of variable frequency speed regulation device

Variable frequency speed regulation device is a device used to control the speed of a motor, which adjusts the motor speed by changing the input power frequency of the motor. The following is the working principle of the variable frequency speed regulation device:

rectification:

The variable frequency speed regulation device first converts the input AC power into DC power. This is usually achieved through rectification circuits, which are composed of semiconductor devices such as diodes or thyristors.

wave filtering:

The rectified DC power usually contains pulsating components and needs to be smoothed through a filter to obtain a stable DC voltage.

Inverted:

The filtered DC power is then converted into AC power, but the frequency of the AC power at this time is variable. This is achieved through an inverter circuit, which is typically composed of semiconductor devices such as thyristors or IGBTs. The inverter circuit adjusts the frequency of the output AC power based on the control signal, thereby achieving the regulation of the motor speed.

Control:

Variable frequency speed regulation devices are usually equipped with control systems that receive external control signals (such as speed commands, acceleration and deceleration times, etc.) and generate corresponding control signals based on these signals to control the output frequency of the inverter circuit. The control system may also include protective circuits to detect abnormal conditions in the motor or variable frequency speed regulation device itself, and take measures to protect the equipment from damage when necessary.

Output:

Finally, the AC power processed by the variable frequency speed regulation device is transmitted to the motor, thereby achieving precise control of the motor speed.

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