Turn table blasting machine

The turn table wheel blasting machines are typically used for products like castings, forged parts, pressed parts, cylinders, springs, gears, hubs etc.

These turn table wheel blasting machines have a rotating table over which the parts to be blasted are placed. The parts undergo abrasive blasting while rotating on the turn table. The blasting turbines direct the abrasive particles towards the parts from different orientations. Read through the following sections for more description about our standard and satellite turn table machines:

Overview

The turn-table wheel blasting machine is widely used for abrasive blasting of casted, pressed products of ferrous and non-ferrous type. These turn table blasting machines are specifically developed for products that are not suitable for processing in an overhead conveyor or drum blasting machines. Turn table blasting machines relatively take less space and have lesser foot print. The parts are placed on a rotating table. While the parts rotate inside the blast cabin, strategically oriented abrasive blasting wheels eject abrasives towards the parts thus imparting blasting action. The used shotblast media/abrasive fall into a hopper and are recovered by the media recovery system. The turn table machines come as standard machines and special purpose satellite type turn table. Read through the following sections for process description and a brief explanation of the types of machines and its construction.

Standard turn table blasting machines

These machines are offered as standard in three sizes:

The machines are specified by the largest product size it can accommodate. That is the diameter of the turntable and the internal height in the blast chamber.

The uniqueness of these machines is the fact that when the doors are open, the product can be placed right at the center of the machine from the top by moving in from the front of the machine. Read through for more description of the pats and construction of the machine.

Parts and working of the standard turn table blasting machines

The shotblast chamber or cabin of the turn table forms a structural basis for most of the other modules. The frame is constructed to be sturdy and rigid. The cabin houses the turn table and a hopper below the turn table.

The wheel blasting machine is offered with two wing doors as standard. Two front doors allows larger products to be placed inside the shot blasting chamber. As mentioned earlier, the unique design of the shot blasting chamber and doors allows products to be placed at the center of the turntable from the front or transported from the top.

Special high abrasion and wear resistant Austenitic manganese steel plates along with high durability rubber are used at pre-determined locations on the inner surfaces of the blast cabin . The manganese steel plates are placed at locations where there might be direct impact of particles or with high ricochet effect. These linings ensures that the particles hitting the cabin surfaces do not damage the cabin walls and offers long life of the machine.

The doors come with safe interlock mechanism which ensures that the machine shuts down if the door(s) are opened during the shot blasting process. The shot blast chamber houses the turntable on which the products to be blasted are placed. The abrasive ejected out from the blasting wheel impact the part and drop down. The abrasives fall through the perforated table and is fed to the bucket elevator via a chute/hopper system. For larger size of the machine, the hopper comes with a screw conveyor system that transports the abrasive media from the hopper below the table to the elevator. The abrasive shot blast chamber and the table is designed so that the abrasive media is retained and falls through to the hopper/chute and does not fall out of the machine when the doors are opened. The abrasive media is reused multiple times in the machine and this is achieved by the shot blast media recovery system which consists of elevator, media cleaner and storage Silo. The shot blasting media/abrasive is fed back to the abrasive blasting wheel/turbines via valves and hoses.

Straaltechniek International adheres to strict norms for machine building and has a trusted supply chain ensuring high quality materials.

Special satellite turn table blasting machine: parts and working

The satellite turn table machine is made of three sections on the turn table each at 120 degrees apart.

  • The front section is towards the operator and allows for loading and unloading the parts. The machine can also be used as a completely automated system with robotic loading and unloading of parts.
  • The inner two sections are sealed off with doors and the blasting can be carried out while the parts are being loaded/unloaded in the front section.
  • The complete turn table rotates and indexes to move to the next station. However, each section is provided with its own rotation so that the parts are rotating while being blasted.

Read through for a description of the different modules and construction of such a satellite turn table blasting machine.

The blast chamber or cabin of the turn table forms as a structural basis for most of the other modules. The frame is constructed to be sturdy and rigid. The cabin houses the turn table/rotation mechanism for individual section of the table. The table has holes/perforations to allow the abrasive to fall down into a hopper below the turn table.

It is necessary to access the media cleaner and the top of the elevator often to remove collected debris and for periodic maintenance. To be able to reach and work safely, a service platform is provided. For completely automated systems with robot, a safety guard around the machine is provided with laser detection units for additional safety.

The following images show:

  • the location of two high efficiency GN blasting wheels on the blast chamber;
  • and a representative cut section showing the hopper and a screw conveyor in the hopper which transport the abrasive media that falls down form the table a bucket elevator.

The bucket elevator transports the shot blasting media to a higher level and drops off the abrasive shot blasting media into a media cleaner. The shot blasting media cleaner ensures that a clean and correct size of abrasive returns to the machine for blasting. The following images shows the bucket elevator and media cleaner. The bottom of the abrasive media cleaner is provided with two silos. Each silo is fitted with a shot blasting media control valve and the abrasives are fed to the shot blasting turbines via dedicated hoses.

The dust from the blast chambers and the abrasive media cleaner is extracted with a Pat Jet easy access dust filtration unit shown below. The filtration unit ensures that the finer dust particles are removed from the air stream (99.9% filtration efficiency) and the filtered air is let to the surroundings. The filtration or dust collection units are also made in special execution for ATEX or as explosion proof units which can handle explosive dust. For special applications and stringent requirements, Straaltechniek closely works with the parent company Naaykens (Naaykens.com) to offer a wide spectrum of solutions.

References

Over 40 years straaltechniek has been providing bespoke solutions to clients worldwide. From valued individual clients to multinational companies, from single installations to complete inline solutions for large foundries and paint shops we offer a wide spectrum of solutions based on our clients needs. Feel free to browse through our reference sections for more details.

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