Method and device for the abrasive blasting of workpieces
First Claim
1. Device for the abrasive blasting of workpieces, having a chamber (2) with at least one closable opening (3), an extraction device connected to the chamber (2) in order to extract air therefrom, a container (8) for holding blasting agent, and having a blasting pipe unit (5), which can be introduced into the chamber (2) via said closable opening (3) and which has an inlet (12) for the blasting agent, which inlet is connected to a feed line (7), an inlet (13) for ambient air and an outlet opening (14) for the blasting agent, whereby whence blasting pipe unit (5) is introduced into the chamber (2) through the opening (3) in the chamber (2), the blasting agent is transferred from the blasting agent container (8) via the feed line (7), together with the ambient air which is sucked in via the air inlet (13), into the chamber (2), owing to the subatmospheric pressure generated in the chamber (2) when the air is extracted therefrom.
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Accused Products
Abstract
The present invention relates to a device and a method for abrasive blasting, in particular for the sand-blasting of relatively small workpieces, for example in the hobby sector (model building). The device comprises a chamber (2), which is closed in an essentially airtight manner on all sides and has at least one, and preferably a plurality of, closable openings (3), it being possible to evacuate the chamber. A blasting pipe unit (5), which can be introduced into the chamber via one of the openings and which has an inlet (12) for the blasting agent, an inlet (13) for air and an outlet opening (14) for the blasting agent, is connected to a blasting-agent container (8) via a feed line (7). Both the method and the device operate using subatmospheric pressure, so that it is possible, for example, to use a commercially available vacuum cleaner for evacuating the chamber. Owing to the subatmospheric pressure, the blasting agent remains in the chamber or is extracted via the extraction appliance, so that disturbance to the environment is minimal.
6 Citations
13 Claims
- 1. Device for the abrasive blasting of workpieces, having a chamber (2) with at least one closable opening (3), an extraction device connected to the chamber (2) in order to extract air therefrom, a container (8) for holding blasting agent, and having a blasting pipe unit (5), which can be introduced into the chamber (2) via said closable opening (3) and which has an inlet (12) for the blasting agent, which inlet is connected to a feed line (7), an inlet (13) for ambient air and an outlet opening (14) for the blasting agent, whereby whence blasting pipe unit (5) is introduced into the chamber (2) through the opening (3) in the chamber (2), the blasting agent is transferred from the blasting agent container (8) via the feed line (7), together with the ambient air which is sucked in via the air inlet (13), into the chamber (2), owing to the subatmospheric pressure generated in the chamber (2) when the air is extracted therefrom.
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10. Method for the abrasive blasting of workpieces, comprising the steps of:
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introducing a workpiece into a chamber (2) which is closed in an essentially airtight manner on all sides, reducing the pressure in the chamber (2) by extracting air from the chamber (2), and feeding a blasting agent and air, via a blasting pipe unit, into the chamber and onto the workpiece, the feed of the blasting agent being effected essentially by the suction action of the subatmospheric pressure in the chamber.
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Specification