I. Principles

Hot air circulating oven, also known as electric air blowing drying oven, is a kind of equipment that forcibly circulates heated air in the oven by means of fan circulating air supply, so that hot air can fully contact with the materials to be dried, thus realizing rapid and uniform heating and drying. Its working principle is based on forced thermal convection, and the heated air is sent into the oven by a fan to form a hot air circulation, thus heating and drying the materials.

Second, the structure and composition

Hot air circulation oven usually consists of the following parts:

Box: It is composed of angle steel, stainless steel plate and cold steel plate, and the insulation layer is filled with high-density aluminum silicate cotton to ensure the insulation of the oven and the safety of users.

Heating system: fully independent system, using nickel-chromium alloy electric heater or steam heater, and setting heating mode according to needs.

Circulation system: including high-temperature resistant and low-noise motor and multi-blade centrifugal wind wheel, the heated air is forced to circulate through the action of fan.

Control system: imported advanced temperature control instrument, with PID adjustment and fast self-tuning, can set a variety of parameters, digital display, reading is very convenient. At the same time, there are safety protection measures such as leakage, short circuit, overtemperature, motor overheating and overcurrent protection.

Air duct: there is an air duct in the oven to guide the direction of hot air and ensure the uniformity of indoor temperature. There are two ways of air duct design: horizontal air supply and vertical air supply.

Third, the characteristics and advantages

High thermal efficiency: hot air circulates in the oven, which has high thermal efficiency and saves energy.

Uniform drying: With forced ventilation, there is an air duct in the oven, and the materials are evenly dried.

Temperature controllable: The oven is equipped with a temperature control system, which can set and control the temperature in the oven as required to meet the drying requirements of different materials.

Scope of application: Hot air circulating oven is widely used in food, chemical, pharmaceutical, wood and other industries, and is one of the essential equipment in these industries.

Simple operation: the oven runs smoothly, automatically controls the temperature, and is convenient to install and maintain.

Fourth, the purpose and application

Hot air circulating oven is mainly used for heating, curing, drying and dewatering of materials in medicine, chemical industry, food, agricultural and sideline products, aquatic products, light industry and other industries. For example, traditional Chinese medicine is dehydrated to make powder, granules, etc., and articles to be baked with chemical gases and food processing, such as solder resist baking of circuit boards, curing of ink, drying of paint films, etc. In addition, it is also widely used in electronics, motors, communications, electroplating, plastics, hardware and chemical industry, instruments, printing and other industries.

V. Operation and Maintenance

Operation:

Before use, it is necessary to check whether the power supply, heating system, circulation system and control system of the oven work normally.

Set the heating temperature and overtemperature alarm temperature according to the operating instructions, and start the automatic operation program.

When placing the articles in the box, do not over-squeeze, and leave enough space to ensure the uniform circulation of hot air.

During use, it is necessary to regularly check the operation of temperature regulator, heater, hot air circulation system and other components to ensure the normal operation of the equipment.

Maintenance:

Clean the oven regularly, and wipe the internal and external surfaces with wet cloth to remove dust and stains.

Clean the filter and remove sundries and garbage to ensure normal ventilation.

Check whether the heater is running normally to avoid uneven heating or unstable temperature.

Check whether the hot air circulation system works normally, so as to avoid the product quality being affected by unstable temperature.

Maintaining a good maintenance record is very helpful for the tracking and analysis of problems.

VI. Precautions and Safety Matters

When using the hot air circulating oven, it is necessary to ensure that the power supply voltage meets the equipment requirements, and the grounding wire of the power socket is grounded according to the rules.

When using electricity, it is forbidden to touch the electrical parts in the left space of the box by hand or wipe them with wet cloth and rinse them with water.

The power cord should not be wound on metal objects, nor should it be placed in low temperature or humid places to avoid leakage caused by rubber aging.

Do not put explosive, flammable and volatile articles into the drying oven to avoid explosion.

The oven shall not be cleaned at work, and shall not be wiped with gasoline.

Before use, check whether the automatic control device and indicating signal are sensitive and effective, and whether the insulation of electrical lines is intact and reliable.

To sum up, the hot air circulating oven is an efficient, energy-saving and environment-friendly drying equipment, which has a wide application prospect. In the process of use, attention should be paid to operation specifications and safety matters, and regular maintenance should be carried out to ensure the normal operation of the equipment and prolong its service life.