Weighing hood, also known as negative pressure weighing hood or weighing chamber (working principle)

Weighing hood, also known as negative pressure weighing hood or weighing chamber, mainly includes two types: negative pressure weighing hood and activated carbon weighing hood. Negative pressure weighing hood is mainly used for local purification equipment in pharmaceutical, microbiological research, scientific experiments and other places. Negative pressure weighing hood is a safety treatment equipment used for dust or other harmful substances, which ensures the safety of operators and the environment through negative pressure.
Weighing hood, also known as negative pressure weighing hood or weighing chamber (working principle)
A weighing hood, also known as a negative pressure weighing hood or weighing chamber, is a device used for accurately weighing powdered or granular materials. Its working principle is mainly based on negative pressure technology, which creates a low-pressure environment to weigh materials without the influence of air flow, thereby improving the accuracy and efficiency of weighing.
The working principle of the weighing hood can be divided into the following steps:
Create negative pressure environment: The weighing hood is connected to the outside through a vacuum pump, and by adjusting the power of the vacuum pump, a negative pressure environment is formed inside the weighing hood. The size of this negative pressure environment can be adjusted according to the density and viscosity of the material to ensure that the material is weighed without the influence of air flow.
Material entry: Under negative pressure, the material is sucked into the weighing hood. In order to prevent materials from being affected by air flow during the entry process, weighing covers are usually equipped with doors or inlet pipes with good sealing performance.
Material weighing: After entering the weighing hood, a certain thickness of material layer will be formed on the weighing sensor inside the weighing hood. The weighing sensor will transmit the weight information of the material to the control system, and the control system will calculate the mass of the material based on its density and volume.
Material discharge: After weighing is completed, the negative pressure environment inside the weighing hood will be released, and the material will be discharged from the weighing hood under the action of gravity. In order to prevent the material from being affected by air flow again during the discharge process, the weighing hood is usually equipped with an exhaust device, such as a fan or ventilation duct.
The working principle of the weighing hood has the following advantages:
Reduce the impact of air flow on material weighing and improve the accuracy of weighing.
Prevent the generation of dust during the weighing process of materials and improve the working environment.
Improve the efficiency of material weighing, save manpower and time costs
Suitable for weighing various powdered and granular materials, with a wide range of applications.
In summary, the weighing hood, as a precise device for weighing materials, has been widely used in industries such as chemical, food, and pharmaceutical due to its unique working principle and excellent performance.