7 Things You Should Know About Shot Blasting Machine

1. Origin of Shot Blasting Machine

#Shotblastingtechnology in China has only entered the practical stage since 1982, while in Europe and the United States has long been applied #shotblasting technology, #shotblastingmachines in the United States International Surface Treatment Co,.Ltd in the 1970s, when it was successfully used in industrial flooring surfaces , painting industry, concrete floating slurry cleaning, and surface brushing, greatly improving the subsequent coating materials with the adhesion of the base.

2. Types of shot blasting machines

Almost all cast steel parts, gray castings, malleable steel parts, ductile iron parts, etc. are subject to shot blasting treatment. This is not only to remove the casting surface oxidation and sticky sand but also casting quality inspection before the indispensable preparation process, such as large gas turbine casing in the non-destructive testing must be carried out before the strict #shotblastingcleaning, in order to ensure the reliability of the flaw detection results. In the production of general castings, shot blasting cleaning is an essential process for finding surface defects in castings such as subcutaneous porosity, slag holes, as well as sticky sand, cold compartments, skin, etc. Non-ferrous metal castings, such as aluminum alloys, copper alloys, and another surface cleaning, in addition to the removal of oxide, the discovery of surface defects in the casting, the main purpose is to blast shot blasting to remove the burr of die castings and obtain the surface quality with decorative significance, to obtain a comprehensive effect. Metallurgical steel production shot blasting or pickling is a process method to ensure that the steel mass production obtains high productivity and the use of mechanical or chemical combined removal of phosphorus skin. Silicon steel sheet, stainless steel sheet, and other alloy steel plate, strip production, in the process of cold rolling process must be annealed and then shot blasting or pickling treatment to ensure the surface roughness and thickness accuracy of cold-rolled steel sheet.

3. Composition of shot blasting machine

Shot blasting machine consists of shot blasting cleaning chamber, elevator, separator, screw conveyor, blasting turbine assembly, abrasive dosing unit, workpieces handling system, foundation, dust removal system, electrical control panel, safety interlock mechanism, etc.

The #blastwheel, which is the core part of the #blastmachine, is generally fixedly mounted. For favorable #blastcleaning in different directions, multiple #blastwheels can be used, in different positions and thrown at the castings/forgings/steel fabrications/beams/metal sheets in different orientations. In recent years, there are also designs that allow #blastingturbines to move steadily or rotate, saving the number of blast machines and allowing for uniform blasting in different directions to the casting to improve cleaning results.

Blasting cleaning chamber, i.e. the place or space for cleaning workpieces, is generally enclosed and related to the placement or movement of workpieces, with their handling system such as roller bed, vertical hanger system, barrel/rock barrel, tumble belt, with rotary table, hanging chain cleaning chamber. In order to prevent projectile wear, the chamber wall is equipped with a guard plate, made of white wear-resistant material or rubber.

The running mechanism of the castings is even more varied. Small castings are suitable for #drumtypeshotblastingmachine, #barrelshotblaster, or #tumbletypeblastingmachine; larger castings are blasted cleaning by trolley type blasting machine for cleaning and are turned manually at regular intervals; for medium and large pieces, the #overheadrail conveyorblastingmachine or O type #hangershotblasters are more suitable.

The separator and blasting media recovery system are also key components to the #shotblastingunit. With the increase of abrasive flow rate, the efficient separation device becomes more important. Tests have shown that when the sand content in the shot exceeds 1% to 2%, the wear rate of the blades is 5 to 10 times faster than when using the pure shot. Currently, the separators used in shot #blastingmachines consist of two types of principles: air wash separator and magnetic separation.

Dust collector device: In the cleaning process, during shot blasting the castings blasting media separation generate a large amount of dust, therefore, the dust collector device is also indispensable for the shot blasting machine. The dust removal system of the #shotblastmachine can integrate with the workshop dust collector system to form a complete dust collecting system, otherwise, The environment of the shot blasting workshop can not be guaranteed.

4. Shot blasting machine safety operating procedures

The operation of the equipment is strictly enforced by the fixed-term training on duty, familiar with the performance and characteristics of the machine.

• Familiar with the operating procedures, use, repair, and maintenance of the shot blasting machine manual.
• The operator must check the control cabinet (panel) all kinds of switches in the required setting position (including the power switch) before the machine can be turned on, in order to avoid misuse, damage to electrical and mechanical equipment, resulting in equipment accidents.
• Non-machine operators must not operate or touch the electrical switch control area at will, and must not be close to the machine work area to avoid accidents.
• Operators must wear protective work clothes, glasses, etc.
• When the operator starts the machine, pay special attention to the indication of all kinds of instruments in the panel, and only when the indication of each instrument reaches the normal value can the operator operate the small crane (roller conveyor) to enter the working procedure? If you find that the individual instrument indication has a large error (not normal) immediately shut down. Check the equipment fault processing before normal start-up work.
• In the operation of the equipment, the operator must inspect this equipment to check whether there is an abnormal sound and overheating phenomenon of each part. When a serious fault is found in the operation of the equipment, press the "emergency stop" button to shut down for repair and cooperate with the professional staff to troubleshoot the equipment.
• Operators must carry out daily maintenance and weekly maintenance (including lubrication) of this equipment according to "equipment management". Clean up the dust and debris in the dust collector in time every week so as not to affect the quality of dust removal and to ensure the integrity of the equipment.
• Operators must achieve civilized and safe production while strictly enforcing the shift changeover system.
• At the end of work, immediately cut off the power switch of the machine so as not to make the equipment in operation. And clean up the worksite.

5. Application range of shot blasting machine

#Shotblastingequipment is firstly used in the foundry industry cast steel, casting iron parts of the surface of the sand, and oxide skin removal.

Almost all cast steel parts, gray castings, malleable steel parts, ductile iron parts, etc. are subject to shot blasting treatment. This is not only to remove the casting surface oxidation and sticky sand but also casting quality inspection before the indispensable preparation process, such as large gas turbine casing in the non-destructive testing must be carried out before the strict #shotblastcleaning, in order to ensure the reliability of the flaw detection results. In the production of general castings, shot blasting cleaning is an essential process for finding surface defects in castings such as subcutaneous porosity, slag holes, as well as sticky sand, cold compartments, skin, etc. Non-ferrous metal castings, such as aluminum alloys, copper alloys, and another surface cleaning, in addition to the removal of oxide, the discovery of surface defects in the casting, the main purpose is to blast shot blasting to remove the burr of die castings and obtain the surface quality with decorative significance, to obtain a comprehensive effect. Metallurgical steel production shot blasting or pickling is a process method to ensure that the steel mass production obtains high productivity and the use of mechanical or chemical combined removal of phosphorus skin. Silicon steel sheet, stainless steel sheet, and other alloy steel plate, strip production, in the process of cold rolling process must be annealed and then shot blasting or pickling treatment to ensure the surface roughness and thickness accuracy of cold-rolled steel sheet.

6. Maintenance work of the shot blasting machine

Shot blasting machine in daily use, there may be some loss, in order to be able to extend the service life of the machinery, then we need to do some daily maintenance work on the shot blasting machine.

First, we talk about the mechanical part of the shot blasting cleaning.

• Overhaul the door of the shot blasting room is about tightly closed.
• Check the wear and tear of the internal wear parts of the blasting turbine, if there is a serious need to replace the new parts in a timely manner.
• Maintenance blasting turbine and its motor on the fixed bolts of the oil condition.
• The shot blasting machine in stopping use, check whether the abrasive recycling screw conveyor is up to the highest position.
• After the shutdown of the shot blasting machine, the internal blasting media should all be transported to the abrasive storage bin, and the total amount is greater than 3 tons or more.
• Check the wear condition of the internal guard plate of the shot blasting chamber.

7. the electrical control panel of the shot blasting machine .

? check whether the signal light of the machine console is working properly.

? see if the proximity switch and limit switch are normal with or without abnormalities.

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