Precautions for using the blow type positive pressure specific gravity selection machine

The blow type positive pressure specific gravity selection machine utilizes the difference in material specific gravity and uses positive pressure airflow to separate and select materials of different densities in a suspended state. It is widely used in industries such as grain, seeds, and chemicals. The following are key precautions during use:

1、 Equipment installation and debugging

Installation environment

Venue requirements: The equipment should be installed on a dry, well ventilated, flat, and sturdy site to avoid displacement or tilting due to vibration during operation. For example, it cannot be installed on soft soil or on surfaces with obvious slopes, otherwise it may cause unstable equipment operation and affect the selection effect.

Space reservation: Adequate space should be reserved around to facilitate the operation, maintenance, and repair of equipment. It is generally recommended to reserve at least 1-1.5 meters of operating space in front, back, left, and right of the equipment, so that personnel can freely enter and exit for daily inspection and maintenance work.

equipment debugging

Air volume adjustment: Adjust the air volume of the fan reasonably according to the specific gravity, particle size, and processing capacity of the material. The air volume is too low, the material cannot be fully suspended, and the layering effect is poor; Excessive air volume may cause some qualified materials to be carried away when light impurities are blown out. For example, when selecting wheat, the optimal air volume can be determined by gradually adjusting the fan damper and observing the suspension state of the material in the selection room.

Vibration frequency and amplitude: Adjust the frequency and amplitude of the vibration motor to evenly distribute the material on the screen surface and smoothly transport it forward. Excessive or insufficient vibration frequency and amplitude can affect the selection effect and equipment lifespan. Generally speaking, the vibration parameters can be adjusted by observing the movement of materials on the screen surface through trial operation, such as whether the materials are stacked and whether there are uneven jumping phenomena.

2、 Material Preparation and Feed Control

Material pretreatment

Impurity cleaning: Before feeding, the material should be preliminarily cleaned to remove large impurities, stones, metals, etc., to prevent these impurities from entering the equipment and damaging components such as screens and fans. For example, when selecting seeds, a cleaning sieve can be used to remove impurities such as straw and soil lumps.

Moisture control: The moisture content of materials has a significant impact on the selection effect. Excessive moisture content can cause materials to adhere and affect layering; Low moisture content may generate excessive dust. Generally speaking, different materials have their suitable moisture range, for example, the moisture content of wheat should be controlled between 12% and 14%.

feeding speed

Uniform feeding: Maintain a uniform and stable feeding speed to avoid sudden changes in speed. If the feeding speed is too fast, it will cause the materials to accumulate in the selection room and cannot be fully layered; Slow feeding speed will reduce the processing efficiency of the equipment. Uniform feeding can be achieved by installing feeding adjustment devices, such as spiral feeders or vibrating feeders, and adjusting their speed or amplitude reasonably.

3、 Running process monitoring

Observe the operating status

Material layering situation: During the operation of the equipment, it is necessary to closely observe the layering situation of materials in the selection room. Under normal circumstances, materials with different densities should be clearly layered, with light impurities in the upper layer, qualified materials in the middle layer, and heavy impurities in the lower layer. If unclear layering or abnormal situations are found, such as material mixing, material running, etc., the machine should be stopped for inspection in a timely manner.

Equipment vibration and noise: Pay attention to the vibration and noise situation of the equipment. Normal equipment operation should be smooth with minimal noise. If there is abnormal vibration or increased noise, it may be due to loose, worn or damaged equipment components. The machine should be stopped in a timely manner to investigate the cause and take appropriate measures.

temperature monitoring

Motor temperature: Regularly check the temperature of components such as motors and fans to prevent damage due to overheating. Infrared thermometers and other tools can be used for measurement, and the motor temperature should generally not exceed its rated temperature. If the temperature is found to be too high, check whether the cooling system is normal, such as whether the fan is running, whether the heat sink is blocked, etc., and take timely measures to cool down.

4、 Equipment maintenance and upkeep

Daily cleaning

Cleaning the sieve: After each use, it is necessary to promptly clean the impurities and residual materials on the sieve to prevent it from clogging. Tools such as brushes and compressed air can be used for cleaning. If the sieve is damaged or severely clogged, it should be replaced in a timely manner.

Cleaning the selection room: Regularly clean the dust and debris in the selection room to keep the interior of the equipment clean. Excessive dust accumulation not only affects the normal operation of equipment, but may also cause safety hazards such as fires.

Regular inspection and maintenance

Component inspection: Regularly inspect various components of the equipment, such as bearings, belts, chains, etc., to ensure their normal operation. Check whether the bearings are lacking oil or worn, whether the belts are loose or broken, and whether the chains are properly tensioned. For severely worn components, they should be replaced in a timely manner.

Lubrication and maintenance: Regularly lubricate and maintain the moving parts of the equipment according to the requirements of the equipment manual. For example, bearings should be regularly lubricated with grease, and belts and chains should be regularly coated with lubricating oil to reduce wear and extend equipment service life.

5、 Safe operation

Operator training

Safety knowledge learning: Operators should receive professional training and be familiar with the operating procedures and safety precautions of the equipment. Untrained personnel are not allowed to operate equipment without authorization. The training content should include the structure, performance, operation methods, maintenance, and emergency response of the equipment.

Safety awareness cultivation: Improve the safety awareness of operators, so that they strictly abide by safety regulations during the operation process. For example, during the operation of the equipment, it is not allowed to open the protective cover of the equipment or reach into the interior of the equipment at will to avoid danger.

Safety protection measures

Protective devices: The equipment should be equipped with comprehensive safety protection devices, such as protective shields, guardrails, etc., to prevent operators from coming into contact with moving parts. At the same time, it is necessary to ensure that the safety protection devices are intact and not dismantled or damaged at will.

Electrical safety: The electrical system of the equipment should comply with safety standards and have good grounding. Operators should pay attention to preventing electric shock accidents during use. For example, it is not allowed to touch electrical equipment with wet hands, and when repairing electrical equipment, the power should be cut off first.