1. Models of electronic crane scales
There are two types of electronic crane scales, one is wireless digital electronic crane scale, and the other is direct-view type Electronic hanging scale.
Second, the composition and structure of the electronic crane scale
The electronic crane scale generally consists of a mechanical load-bearing mechanism, a load cell, an A/D conversion board, a power supply , wireless transmitting and receiving device and weighing display instrument.
1. Composition of wireless digital electronic crane scale
The wireless digital electronic crane scale is composed of a scale body and an instrument, and the scale body includes a mechanical bearing. Force mechanism, sensor, A/D board, wireless transmitting device, power supply and housing, wherein the mechanical force bearing mechanism includes shackle, hook and pin. In addition, in order to ensure the safety and reliability of the system, there are also sensor protection devices.
2. The composition of the direct-view electronic crane scale
Compared with the wireless digital electronic crane scale, the most important feature of the direct-view electronic crane scale It is to directly embed the instrument function in the scale body, and reflect the indicated value of the weighing through the digital display on the scale body.
Three, how to choose the electronic crane scale
1. The choice of accuracy
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As a measuring instrument, the primary problem is accuracy, so when choosing an electronic scale, the primary problem is to consider whether the accuracy of the electronic scale can meet the requirements of the actual work of the unit, and whether it can meet the relevant national weighing instruments. standard requirements. Generally speaking, as long as it can meet the accuracy required by the unit, it is not too high to pursue high accuracy. Electronic crane scales with too high accuracy have more demanding working conditions and higher prices.
2. Selection of functions
With the popularization of electronic sensor technology and computer network management, various measurement and control devices have emerged as the times require , In order to facilitate computerized management, it is hoped that the signals output by various sensors are as consistent as possible to reduce intermediate links. Currently, the most used interface signals are standard RS-232 ports and 20mA current loop signals. The general functions of the electronic scale are set as: tare (clearing), accumulating (subtracting) by category, storing vehicle number, tare weight, printing, communication, overload alarm, changing receiving channel, setting password, etc.
3. Selection of weighing range
When selecting the weighing range, the most easily overlooked is the minimum weighing range, and the weighing range is too large. Although the electronic scale can reach the specified range of national accuracy when performing small weighing, the relative error will become larger. In addition, it is necessary to consider the matching of electronic scales and cranes, especially whether the rings and hooks of electronic cranes are suitable. Read the manufacturer’s samples carefully, and make special recommendations in advance if necessary. Of course, it is also very important not to overload the electronic crane scale.
4. Choice of adaptability and safety
Users should put forward requirements according to their own working environment, from the perspective of non-ferrous industry, for raw materials The electronic crane scale that enters the factory and sells the finished product can use the normal type. If it is used in the electrolysis workshop, the problems of anti-magnetic, heat insulation and insulation should be considered. In some occasions, problems such as waterproof, moisture-proof and explosion-proof should also be considered, but the accuracy of the crane scale will be affected. The sensor generally has an overload force of 150%. Although too much overload will not cause safety problems, it will affect the accuracy of the electronic scale.
5. Choice of universal interchangeability
Usually, a unit uses more than one electronic crane scale and other forms of electronic weighing instruments. The universal interchange between them and the universal interchange of accessories is particularly important. As we all know, from truck scales, rail scales, electronic platform scales, to valuation scales, weighing scales, counting scales and electronic balances, all of them use resistance strain sensors as sensitive components, and even the force measurement used by weighing instrument manufacturers and measurement departments. The machines also use resistance strain sensors, so that it is easy to realize network management, which greatly facilitates users and reduces the use and maintenance costs.
6. Guarantee of after-sales service
A good product will inevitably fail once during use. Quick exclusion, whether the manufacturer can provide services in a timely manner is a very important consideration in product selection. A good product should be designed with the convenience of maintenance in mind. Generally, it should be modularized and easy to replace. When there is a problem, there should be a prompt sign to help determine the cause of the failure. When it cannot be solved by itself, the manufacturer must provide it in time Door-to-door service.
7. Economic benefits
The economic benefits of using electronic crane scales include three aspects, one is the purchase price, and the performance price should be compared The second is the necessity of using the electronic crane scale, whether it can reduce the operation links, save the site, reduce the cost and improve the product quality and bring benefits; the third is the electronic scale accessories and Whether the consumable materials are universal, whether they are guaranteed for a long time, and the price should not be too expensive. Combining these factors is a reference for considering economic benefits and decision-making.
