DE1962117A1 - Process for cleaning and recovering blasting media - Google Patents

Description

Applicant: BADISCHE MASCHINENFABRIK GMBH '1962117 75 KARLSRÜHE - DURLACH PPINZTALSTRASSE 90

METHODS FOR CLEANING UP AND RECOVERING ABRASIVES

The invention relates to an improvement in the cleaning and recovery of magnetic blasting media in known Blasting machines, as they are known for cleaning castings, descaling and cleaning forgings or rolled material »

Such blasting machines usually have a blasting medium circuit that collects the used, contaminated blasting medium, that accumulates in the lower part of stationary machines is fed to a cleaning device before it enters its cycle Turbines or price jet nozzles is fed back.

The cleaning device can consist of just one wind sifting or several wind siftings connected one behind the other exist »There are also cleaning facilities that can be used as

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nation of magnetic cleaners are trained with wind cleaners «The wind sifters work with one or more Cascades, in a particularly advantageous design, the air is guided behind each cascade in an increasing manner Canal «All of these air separators are limited in their performance by the fact that a certain air speed is not may be exceeded, because otherwise usable blasting media will be carried away to the side of the contamination, whichever then is lost. In the case of the air separators with an air duct In the event of unfavorable operating conditions, the channels can become clogged if there is more material to be separated than able to carry air.

The air, from which energy is withdrawn as it flows through the channel, then leaves the overload of material in the channel fall, creating deposits and clogging. If one were to lead an increased amount of air through the cascades, if this evil had been encountered, one could also have a greater one Separate the amount of contamination in one air separation, otherwise of the same dimensions. This measure is countered by the inevitable loss of usable abrasive "

The invention overcomes this disadvantage by providing that in the Air sifting of the material separated from the blasting media, which does not get into the air duct with the cleaning air, but rather in a relaxation room due to its grain size behind the cascade or cascades of wind sifting occurs

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a magnetic separator is routed, the flow of which for magnetic material is fed back into the blasting media circuit of the machine is directed. A particularly advantageous embodiment is characterized in that in the case of a machine which already has two magnetic separators in the blasting medium circuit, the discharge from the expansion chamber is behind the cascade or cascades is passed through the second magnetic separator.

Further details of the invention can be seen from the drawings, the description and the claims «

Fig. 1 shows the chemical representation of a shot blasting machine with abrasive circuit

Pig, 2 shows a blasting machine with a different blasting medium circuit,

In Flg. 1 1st l a blasting chamber with a spin 2. In the lower part of the blasting chamber, a transport device, for example for a motor-driven screw 3, the blasting agent and impurity to a further transport device, · conveyed k a bucket B "In the course of these transportation devices may be a separator for larger foreign body be provided, which is not shown in the drawing. The contaminated blasting media is thrown into the wind sifter 5 with cascades from above. A fan (not shown) sucks in air at the connector 9, which enters the wind sifting at 6 and after flowing through the cascades in the relaxation space 8 _#, for example

χ e.g. according to P 15 77 5iO, 3-l4

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By deflecting and / or slowing down its speed, the coarser portion of the material carried along in the cascade can fall, while the fine portion leaves the machine through the pipeline connected at 9. A throttle valve is provided in the connection piece 9. The precipitated material is fed through line 11 to a magnetic separator, non-magnetic material leaves the abrasive cycle at I ¹ *, while recovered abrasive is fed back into the abrasive cycle through the line.

In Pig, 2, in contrast to Pig, I, there is a first magnetic separator 17 shown with drain 18 for impurities, the line 11 from the relaxation space 8 has a shut-off device 15 with line 16 to the second magnetic separator 12. The designations of the other parts are the same as those of the description of Fig, I,

The effect of the method is based on the interaction of a magnetic separator 12 for the recovery of blasting media and the possible opening of the throttle valve 10. In the known machines, the amount of air had to be used for the air separation must be adhered to very precisely and should not be too large so that no usable abrasive is carried away, on the other hand It couldn't be too low either, because otherwise the channels in the wind sifting system would become clogged if there was a lot of sand was feared. The potential efficiency of the wind sifting could therefore never be exploited. The invention eliminated

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this deficiency in that the material accumulating in the expansion space 8 is passed through a magnetic separator 12, in order to recover entrained abrasive, this makes it possible to open the throttle valve 10 further and more Passing air through the wind sifting 5.7 at greater speed. This increases the separation efficiency and the machine cycle time can be shortened and the sand residues still remaining in the blasting sand after cleaning can be reduced kept away from the centrifugal wheels »It is particularly advantageous to use the method in machines according to Fig. 2, the other reasons in the blasting cycle are already two Own magnetic separator, it can then without additional effort the second magnetic separator 12 can also be used for the material from the relaxation space 8, since the amount of sand füz the magnet 12 is large at the beginning of each work cycle and then decreases sharply at the end of the cycle, is expedient the shutter 15 controlled so that the material from the relaxation room If possible at the end of the cycle or during the batch change, the magnet is given, which also improves the quality the best of the separation.

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Claims (1)

Expectations 1. A process for the purification and recovery of beam W medium characterized in that the separated in the air separation from the shot material, which does not contact the cleaning air into the line (9), but, due to its grain size in a Entspannungsraura (8) behind the or the cascade (7) of the air separation occurs, is passed over a magnetic separator (12), the flow of which for magnetic material (13) is directed into the blasting medium circuit of the machine, . 2, method according to claim 1, characterized in that at a blasting medium circuit with two magnets (17, 12) connected in series, the drain (11) from the expansion space behind the cascade or cascades (7) via the second magnet separator is directed. 5 * Device for carrying out the method according to claim 2, characterized in that in the discharge line (11) for non-magnetic material from the stress relief space (8) the wall 109831/0991 Sighting (7) a shut-off device (15) is installed, 4, mode of operation for the actuation of the shut-off device (15) according to claim 3, characterized in that im Rhythm of the machine the shut-off device only at the end of the clock is open when the attack of non-magnetic Material from the first magnet has worn off, 5, Automatic actuation of the shut-off device (15) after Claim 3 and 4 characterized in that a timer around such a tent span before the end of the machine cycle gives an impulse to open the shut-off device that the majtimal possible amount of material in the relaxation room up to End of cycle emptied. 109831 / Π991