What safety precautions should be paid attention to during the use of sandblasting machine?

The following safety precautions should be paid attention to during the use of sandblasting machine:

I. Protection of operators

Respiratory system protection

A large amount of dust will be produced in the process of sandblasting, which may include abrasive particles, chips of processed materials and so on. Operators must wear appropriate respiratory protective equipment, such as dust masks or gas masks.

For long-term and large-scale sand blasting operations, it is recommended to use a gas mask with high-efficiency filter elements, such as a semi-mask gas mask equipped with P100 (filtering efficiency of non-oily particles reaches 99.97%) to prevent inhalation of harmful dust and chemicals.

Eye protection

Abrasive may rebound and splash when sandblasting, which is easy to cause damage to eyes. Therefore, operators should wear standard safety goggles or protective masks.

Safety goggles should have good impact resistance and tightness, which can prevent abrasive particles from entering the eyes from the side or gap. The protective mask can provide more comprehensive facial protection, especially suitable for working in an environment where there may be a lot of abrasive rebound.

Physical protection

Wear protective clothing, generally choose wear-resistant and dustproof work clothes, such as denim work clothes or special sandblasting protective clothing. This can prevent the abrasive from scratching the skin of the body and prevent dust from entering the clothes.

Protective gloves and shoes should also be worn for parts that may come into contact with abrasive or processed materials, such as arms and legs. Protective gloves should have certain wear resistance and flexibility, while protective shoes should have smash-proof, anti-slip and dust-proof functions.

Second, the equipment operation

Equipment inspection and maintenance

Before starting the sandblasting machine, the equipment should be thoroughly inspected. Check whether the pressure of the sandblasting tank is normal. Generally, the working pressure of the sandblasting tank is between 0.4 MPa and 0.7 MPa. If the pressure is too high, the sandblasting pipe may be broken, and if the pressure is too low, the sandblasting effect will be affected.

Check whether the sandblasting pipe is damaged or aged. If there is a crack in the sand blasting pipe, abrasive may be ejected from the crack during the sand blasting process, causing harm to the operator. At the same time, check whether the nozzle of the spray gun is blocked or worn, and clean and replace the nozzle regularly to ensure the uniformity and efficiency of sandblasting.

Correct operation process

When starting the sandblasting machine, the ventilation equipment should be turned on first to ensure good ventilation in the work area. Ventilation equipment can eliminate the dust generated in the sand blasting process in time and reduce the dust concentration in the working environment.

Open the equipment in the correct order, generally turn on the air source first, and then open the sandblasting valve for sandblasting operation after the pressure in the sandblasting tank is stable. In the process of sand blasting, the operator should keep the spray gun stable to avoid the spray gun suddenly shaking or pointing at himself or others.

When stopping sandblasting, first close the sandblasting valve, let the residual pressure in the sandblasting tank be released, and then close the air source. This can prevent accidental spraying caused by residual pressure in the sandblasting tank.

Third, the working environment

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The sand blasting operation area must have good ventilation conditions. The ideal ventilation system should be able to quickly discharge the dust generated during sand blasting, so that the dust concentration in the workplace can meet the occupational health standards.

A combination of local ventilation and overall ventilation can be adopted. Local ventilation, such as setting a dust hood near the spray gun, can directly collect most of the dust generated by sandblasting; Integral ventilation can ensure the air quality of the whole workshop.

Work area isolation

In order to prevent dust and abrasive from splashing to other areas during sand blasting, the sand blasting work area should be isolated. Fences, screens, etc. can be used for isolation, and obvious warning signs are set in the isolation area to remind non-operators not to enter.

When carrying out large-scale or continuous sand blasting operations, we should also consider setting up a special sandblasting room, and put the sandblasting machine and products to be treated in the sandblasting room to further reduce the impact on the surrounding environment.

Iv. Abrasive and processed materials

Abrasive selection and treatment

Select the appropriate abrasive according to the properties of the material to be treated and the surface treatment requirements. For example, for softer materials, such as aluminum and plastic, finer abrasives, such as glass beads, should be selected to avoid excessive damage to the surface of the material.

Abrasive should be screened and dried before use. Abrasive containing impurities or moisture may affect the sandblasting effect, and even cause the sandblasting equipment to be blocked or damaged.

Fixation and inspection of processed materials

Firmly fix the processed product on the workbench or fixture. If the product moves during sandblasting, it will not only affect the surface treatment effect, but also lead to uncontrollable rebound direction of abrasive and increase safety risks.

Before sandblasting, check whether there are potential hazards in the treated materials, such as hollow parts that may contain flammable and explosive gases inside. For such parts, appropriate measures should be taken before sandblasting, such as gas replacement, to prevent explosion and other dangers.