The manufacturer of the shot blasting machine will talk with you about the main functions of the shot blasting machine and what is the cause of the fire.

The following is introduced to you by the shot blasting machine manufacturer:

Main functions of shot blasting machine:

It can remove the scale or sand on the surface of cast steel and cast iron, play a role in cleaning the surface of the casting, and is also a necessary step to check the quality of the casting. The casing of large steam turbine can be detected only after the shot blasting in front, so as to ensure reliable results. Use the shot blaster to throw 0.2~0.8 projectiles onto the surface of the workpiece to make the surface of the workpiece reach a certain roughness, make the workpiece beautiful, or change the compressive stress of the workpiece to improve the service life. For castings, shot blasting is a necessary process to find defects such as peeling and subcutaneous pores on the surface. Through shot blasting, the castings can be guaranteed to have high quality.

Causes and countermeasures of shot blasting machine fire:

1. There is a hot fire source outside, such as welding sparks being sucked into the dust collector, or the steel shot being shot at high speed and hitting the steel plate rebounding after being sucked into the dust collector by the fan, causing internal combustion.

2. The internal temperature of the precipitator is too high, causing spontaneous combustion. We know that the surface temperature of the steel plate after shot blasting treatment is about 80 degrees. With the continuous rise of the temperature of the whole shot blasting system, the dirt on the surface of the workpiece is treated in the form of dust, and is subject to dust removal. If there is dust accumulation over the years, plus the iron powder which is oxidized to generate heat energy, it is easy to induce spontaneous combustion of the dust collector.

3. A large amount of oxide scale, dirt, welding slag and rust produced by shot blasting of the workpiece are prone to generate static electricity when they are rubbed in the high-speed air flow. The electric charge with dust moves in the air duct, rubs, and accumulates in the dust collector, resulting in higher and higher electrostatic potential.

Countermeasures:

1. Clean the rust dust regularly to prevent the rust dust from depositing. For the accumulation of heat energy, the accumulated dust in the dust remover shall be cleaned in time. It is required to carry out back-blowing and ash unloading in each shift. When the shot blasting machine handles flammable and explosive dust, it is necessary to pay attention to the negative pressure in the dust removal and shot blasting room.

2. Avoid impact sparks in the shot blasting machine. Fire source control during maintenance. During the subsequent internal and external maintenance work of the shot blasting unit, strictly control the ignition source to prevent the line from striking. During the gas-electric welding operation, the surrounding dust should be removed first, and it is allowed to start the test run or production 10 minutes after the maintenance operation. At the same time, smoking or other ignition is strictly prohibited near the shot blasting unit to prevent hot particles or sparks from being sucked into the dust collector.

3. The shot blasting machine shall select appropriate explosion-proof glass bead or magnesium alloy shot. Thickened polyurethane protective plate shall be used inside the shot blasting machine, and stainless steel layer shall be used for the outer layer.

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