In recent years, some foreign experts pointed out that material handling engineering technology is one of the weakest and most urgently needed areas in modern industrialization, but it is also one of the most potential and most promising areas, and proposed that material handling technology is the third. The concept of a profit source. Material handling machinery usually includes six categories of products: lifting machinery, transportation machinery, loading and unloading machinery, storage machinery, industrial handling vehicles and hydraulic machinery. China refers to the habit of material handling machinery as lifting and transporting machinery. Due to its variety, strong function and large effect, the lifting machinery is in a leading position in material handling machinery and the earliest material handling machinery using weighing technology.
First, the application history of weighing technology on lifting machinery
Hoisting machinery is a handling device that lifts, lowers, and moves the material in a batch operation. In order to complete the weighing of the material being lifted while the crane is working, people have come up with the idea and desire to assemble the weighing device on the lifting machine.
The history of lifting machinery using weighing technology has been more than 200 years. In the Bavarian State Bureau of Metrology in Munich, there is a wall spring scale weighing around 1780 for weighing loads; one in Hamburg
A 1760 fixed boom jib crane with a 1858 made scale. In the first half of the 19th century, crane (crane) scales were known as "Swedish ship scales". In 1932, the error of the crane scale with slings was able to reach within 0.2% of any load, thus obtaining type approval.
Second, the application status of weighing technology in lifting machinery
With the breakthrough of digital technology, especially the advancement of electronic weighing technology, the development of mechanical, automation, integration and intelligentization of lifting machinery has been promoted. Due to the continuous expansion of industrial production scale and increasing production efficiency, the large-scale, high-speed and special-purpose lifting machinery has the characteristics of automation, intelligence and informationization. The application of modern weighing technology has enabled various lifting machinery to directly participate in the loading, unloading, transportation, lifting, sorting, stacking, storage and even distribution of materials in the working environment, and sometimes it can directly measure, identify and track materials. And management and so on.
At present, weighing devices used on hoisting machinery can be generally classified into two types: electronic hanging scales and special weighing devices. There are many related instructions for obtaining widely used electronic crane scales, which will not be explained here. Mainly refers to the special weighing means on the crane has been widely used from the weight of three <br> limiter, the limiter from the weight
1. Noun Definition The weight limiter is a weighing protection device that prevents the hoisting machinery from being overloaded by detecting the lifting weight, also known as a crane overload limiter or a crane load limiter.
2. "Safety Regulations for Hoisting Machinery" stipulates that GB6067-85 "Safety Regulations for Hoisting Machinery" stipulates: Overhead limiters should be installed for bridge cranes larger than 20t and gantry cranes larger than 10t; bridges and gates for other tonnages Cranes and electric hoist single or double girder cranes should be equipped with overload limiters.
3. The composition of the weight limiter The weight limiter is generally composed of a resistance strain gauge load cell and a weighing control instrument. The load cell is used to detect the lifting weight; the weighing control meter discriminates according to the lifting weight and outputs a corresponding state control signal.
4. Structural Features The biggest feature of the weight limiter is that it is effectively combined with the specific structure of the hoisting machinery to ensure that the use of the load cell and the weighing control instrument does not damage the safety of the crane. At the same time, it should meet the functional requirements of reliable performance, convenient maintenance and high measurement accuracy.
According to the specific structure of the electric hoist single beam or double girder crane, the lifting limiter usually adopts a plate ring type or other rope type load cell, and the installation position is at the fixed end of the wire rope; the weighing control instrument is usually installed in the driver's cab or Control button above the station.
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