During the operation of a shot blasting machine, various issues may occasionally arise-such as oil leaks, bearing failures within the blast wheel, or damage to the blades. The following section outlines the methods for addressing these common malfunctions.
Equipment Oil Leaks
First, identify the root cause of the oil leak. If it stems from wear between a shaft and its corresponding bore, a sealing groove can be machined into the bearing housing-for components such as the gear shift lever or clutch-and fitted with a sealing ring. If the leak is caused by the aging of a pressure-reducing rubber ring, simply replace the ring. If a ball valve is leaking at its opening/closing mechanism due to corrosion or wear, remove the corrosive deposits and replace the ball valve with a suitable steel ball.
Blast Wheel Bearing Failure
Common causes include damage from external forces, fatigue wear, improper installation, or insufficient lubrication. Remedial measures include conducting regular inspections and maintenance on components such as the impeller, drive belts, and liners to eliminate external forces that could damage the bearings; strictly adhering to installation standards; and performing routine checks to ensure adequate lubrication.
Blade Damage
During shot blasting operations, the blades are subjected to constant impact from the abrasive media. Over time, this continuous impact can lead to blade wear or cracking. Therefore, the blades must be inspected frequently; they should be replaced immediately if their thickness has worn down by more than half or if deep grooves are observed. Casting defects in the blades can accelerate wear; thus, it is crucial to ensure the quality of the blades when purchasing replacements. Note that blades should always be replaced in pairs to maintain the rotational balance of the blast wheel.
Control Cage Damage
The control cage is fixed to the housing of the blast wheel. By rotating this component, the trajectory of the abrasive media can be adjusted; however, this operation inevitably leads to wear on the control cage. Typically, if the control cage exhibits 10 millimeters of wear, it should be replaced. When installing a replacement, ensure that the opening angle (the "pocket" angle) is set to 45 degrees.
Dust Collection System Malfunctions
One common issue is dust leakage. This typically occurs because the exhaust airflow volume is insufficient; adjusting the baffle plate is usually all that is required to resolve this problem. Another potential cause is an excessive accumulation of dust within the filter bags; cleaning or replacing the filter bags will resolve this issue. Alternatively, the fault may stem from an excessive buildup of dust inside the dust collector itself; in this scenario, simply cleaning out the accumulated dust will rectify the problem.
Failure to Remove Dust
In this instance, it is necessary to diagnose the root cause of the malfunction. If the issue is traced to incorrect wiring of the shot blasting machine's dust collector fan, rewiring the unit will provide a solution. If the problem lies with the internal filter bags-such as being improperly secured or damaged-adjusting or replacing them will resolve the issue.
The points outlined above represent the common malfunctions and corresponding troubleshooting methods encountered during the operation of shot blasting machines. Should a fault occur during use, it is essential to conduct a targeted inspection and repair to ensure the equipment continues to operate at optimal performance.
