Application of Weighing in Reactor Tanks

Application of Weighing in Reactor Tanks

The accuracy of the weighing and batching of reaction kettle tanks is an important factor related to product quality in many industries. Therefore, as a weighing device for reaction kettle tank batching, the weighing module can weigh the weight of the required materials without touching the materials. Compared with traditional sensors, it has the characteristics of good stability, high accuracy, easy installation, and prevention of measurement errors caused by improper installation, and reduces the influence of external environmental factors on weighing. With the continuous development of industrial automation production in China, weighing modules have been widely used in many industries.
1. Characteristics and working principle of weighing module
The weighing module is a new type of weighing unit that combines high-precision sensors, load transmission devices, and installation connection devices. This device is not affected by installation conditions and environment, and can ensure the stability and accuracy of the sensors while avoiding the risk of weighing errors caused by installation. The weighing module mainly consists of a top plate, a bottom plate, weighing sensors, sensor pressure heads, and supporting bolts. The characteristics of weighing modules are compact structure, reasonable and simple design, all components do not require welding, and there are no other additional accessories. Since all weighing modules are produced, installed and tested according to standards, they can be easily and quickly installed and debugged.
In the reactor tank batching system, a fixed weighing module is usually used in combination with other floating and semi floating weighing modules, which ensures that the force point of the sensor on the weighing module remains unchanged when the weighing system is displaced by thermal expansion and contraction. This can ensure the high accuracy and long-term stability of the weighing sensor, while also preventing measurement errors caused by improper installation.
The working principle is that the weighing module generates an analog electrical signal proportional to the weight of the reaction vessel, and then connects the analog signals of each weighing module in parallel to the junction box. We can adjust the output of the weighing module according to its respective force conditions, and then transmit the summarized signal to the weighing display terminal to display the weight data. The junction box and weighing display control terminal should be selected with different protection levels and explosion-proof levels according to the requirements of the usage site.

2. Installation of weighing module

In the weighing and batching system of the reaction kettle tank, the selection, installation, and commissioning of the weighing module will directly affect the measurement accuracy of the entire batching system. Therefore, strict and cautious design and installation should be carried out. The material of the weighing module should be determined according to the environment of the usage site. If it comes into contact with corrosive chemical raw materials, stainless steel weighing modules should be used, and explosion-proof requirements should also be considered. The weighing module should be installed with the support point of the reaction kettle tank as the force point, and the rigidity and straightness of the support should be good. The number is generally composed of 3 or 4. All weighing modules should be installed on the same horizontal plane and evenly distributed, so that the weight of the reaction kettle tank can be evenly distributed on the weighing module, ensuring that the force on the weighing module is uniform and vertical, and that the force carried on each weighing module is close to the same, in order to reduce errors caused by the influence of the supporting structure on the weighing module.
When installing the weighing module, welding operations should be strictly prohibited to prevent current from passing through the weighing module and damaging the weighing sensors in the module during welding. If welding is necessary, the grounding wire should be directly connected to the kettle body, and care must be taken not to let the current circuit pass through the weighing sensors in the weighing module during welding to prevent damage to the sensors in the weighing module. However, in actual use, the weighing module is affected by various environmental factors such as wind and vibration, which can affect the measurement accuracy of the weighing module. In the weighing and batching system of the reaction vessel, the entry and exit of raw materials and finished products are mainly transported by pipelines, so the connection between pipelines and reaction vessel bodies is particularly important. Improper connection will affect the normal use of the weighing and batching system of the reaction vessel, resulting in significant deviations. Therefore, the pipeline connected to the reactor body should be connected with a hose, and the support of the pipeline should be installed on the framework of the reactor body, and should be laid horizontally to prevent the pipeline from exerting a restraining force on the reactor body and causing errors, ensuring that the weight of the reactor body * acts on the sensor of the weighing module.

3. Debugging of weighing module
After the installation of the reactor tank weighing and batching system is completed, it should be debugged and calibrated. The commonly used debugging and calibration methods now include standard weight method, substitution method, and standard signal simulation calibration method. The standard weight method is to gradually load the standard weight from zero to the scale, and then gradually unload it to an empty scale for calibration. The result of loading using this method is accurate, but it requires that the reaction kettle tank weighing and batching system be equipped with a platform bracket or hook device for placing the weight. The substitution method is relatively simpler, which means that when only a small number of weights can be used for calibration, other substitutes can only be used for calibration. Starting from the zero point of the empty scale, standard weights are repeatedly compared with other substitutes for calibration. When standard weights cannot be used for calibration, the mass of the substitute can only be weighed on another high-precision scale first, and then the substitute can be placed in the reaction vessel weighing and batching system for calibration. The substitution method is currently the commonly used method for calibrating reaction vessel weighing and batching systems. The standard signal simulation calibration method replaces the signal output of the weighing module with a standard signal source to simulate the empty scale value and full scale value of the reaction vessel weighing and batching system. The range calibration is carried out by adjusting the output of the standard signal source. This method has a certain impact on the accuracy of the reaction vessel weighing and batching system and is generally not used.

4. Post maintenance of weighing module
The weighing module should be regularly inspected during use, cleaning up debris and materials on the weighing module to prevent jamming, checking the reliability of the limit in the weighing module, inspecting the safety and firmness of the wiring of the weighing module, and carefully checking the connection of the pipes and brackets on the reactor body to prevent interference and ensure the normal operation of the weighing module. In addition, the weighing and batching system of the reactor body must be equipped with lightning protection devices to prevent lightning damage to the sensors in the weighing module. Therefore, each weighing module must be well grounded.