In recent years, some foreign experts pointed out that the material handling engineering technology is the modern industry, the weakest and most urgent need to address one of the areas, but also the most potential and most promising areas of the proposed material handling technology is the third The concept of profit source. Material handling machinery usually includes machinery, transportation machinery, handling machinery, storage machinery, industrial transport vehicles and water machinery a total of six major categories of products. China's material handling machinery used as lifting transport machinery. As the lifting machinery has many varieties, strong function, the role of large, in the material handling machinery in a dominant position, but also the earliest application of weighing technology materials handling machinery.

Weight limiter：

1、Definition：

The weight limiter is a weighing device that, by detecting the lifting weight, prevents the crane from being in danger of overloading operations, also known as the crane overload limiter or the crane load limiter.

2、"Safety rules for lifting machinery"：

More than 20t of the bridge cranes, more than 10t gantry crane should be installed overload limiter; other tonnage of the bridge and gantry cranes and electric hoist single or double girder cranes loaded overload limiter.

3、The composition of the weight limiter：

Weight limiters generally by the resistance strain gauge load cell and weighing control instrument composed of two parts. The weighing sensor is used to detect the lifting weight; the weighing control instrument is judged according to the lifting weight. Output the corresponding status control signal.

4、working principle：

The load cell detects the lifting weight and the output signal is amplified by the amplifier. The amplified signal is sent to the weighing control meter. Weighing control instrument according to the weight signal and "pre-alarm", "delay alarm and control" and "immediately alarm and control" three reference weight signal set value comparison to determine the output of the corresponding state control signal. The three base weight signals are set at 90%, 105% and 130% of the rated load, respectively.

Concluding remarks：

From the successful use of weighing technology to the crane machinery so far, has created a billions of output value, the national standard revision also proved that the use of weighing technology in the crane machinery can produce huge economic benefits and a wide range of social benefits.

At present, the large-scale and efficient crane control device has developed into all-digital electronic control system. The application of modern industrial weighing technology has become an important link in the decision-making parameters of crane in material handling. It is the guarantee of effective profit.