Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
  • B08B3/04—Cleaning involving contact with liquid
  • B08B3/06—Cleaning involving contact with liquid using perforated drums in which the article or material is placed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
  • B08B7/04—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by a combination of operations
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G3/00—Apparatus for cleaning or pickling metallic material

Definitions

• the invention relates to a method and a device for de-oiling, romming, washing and drying industrial piece goods, in particular objects with blind holes.
• UREX (j to be able to be dried in a centrifuge.
• the disadvantage of this known cleaning method is that it is time-consuming and costly because the objects to be cleaned have to be brought into a special device for scrubbing and washing. This device for scrubbing and washing takes up space, its purchase is costly, and additional transport devices are necessary to transport the items between the centrifuge and the scrubbing and washing device.
• the object of the invention is to provide a method which, while avoiding the disadvantages of the known method, permits fast, problem-free and largely automatable cleaning of industrial piece goods and in which the associated device is compact, inexpensive and avoids transport routes can be.
• a centrifuge drum filled with the objects to be treated is driven at a high number of revolutions with a vertical axis of rotation, the objects being de-oiled and the spun-off oil being removed; the centrifuge drum is then braked, tilted into a scrubbing wash position and driven at a reduced rotational speed about a second inclined axis of rotation, the in the centrifuge tro located objects are treated as in a scouring bell and then a detergent and / or dishwashing detergent, in particular cleaning solution, is poured in and after this washing cycle the centrifuge drum is set to a higher number of revolutions while maintaining the inclined axis of rotation, the cleaning and Detergent is at least partially discharged and the objects to be treated are redistributed in the centrifuge drum to avoid larger imbalances and finally the centrifuge drum is tilted back into the vertical centrifuging position and brought to a higher number of revolutions for removing the remaining detergent and detergent and for drying the objects to be treated becomes.
• Centrifuges whose drive axes for the centrifugal drum can be tilted from a vertical position into an inclined position are known from DT-PS 194 809; 1 167 751 and 1 232 076 are known. With these centrifuges, the tilting of the drive axis serves to empty the drum or - in the case of DT-PS 194 809 - to distribute the centrifuged material in the centrifugal drum.
• One device can be used to carry out all the operations required for de-oiling, rumming, washing and drying. This eliminates the need to transport the objects to be cleaned during the individual process steps.
• a combined centrifuge operating according to this method is less expensive than two separate devices and more space-saving than these. Furthermore, the control of the combined centrifuge can be easily automated and finally the time required for the entire cleaning process is shorter than in the known method. In the
• the device according to the invention takes over the function of the scrubbing washing device of the known method.
• an outlet is arranged on the bottom of the collecting housing surrounding the centrifuge drum at the lowest point in the tilted position, which outlet has a two-way valve with a collecting container for the thrown off liquid, in particular oil , or can be connected to a collecting container for the cleaning and / or rinsing agent.
• the jacket of the centrifuge drum is cylindrical and has outlet openings for the centrifuged Liquid on and is surrounded by a conically widening sheet metal jacket, the upper edge of which is drawn up at least to the level of the upper edge of the drum jacket.
• the centrifuge drum and the sheet metal jacket can be filled with cleaning and / or rinsing liquid to the lowest point of the upper edge of the sheet metal jacket.
• the underframe is fastened on a swivel frame pivotally connected to a base frame and that a length-adjustable swivel drive is arranged between the base frame and the centrifuge.
• the swivel drive is expediently designed as a hydraulically lockable cylinder-piston unit which, with the aid of a pressure accumulator, holds the centrifuge with high preload, for example 50 to 100 bar, in the normal position and in the tilted position.
• the cleaning and rinsing agents are expediently fed into the centrifuge drum via a feed line on the centrifuge lid. These means can also be fed through the drive shaft of the centrifuge drum.
• a carriage with Lifting device picks up a filled insert from the loading station and inserts it into a combined centrifuge according to the invention. After the lid has been closed, the centrifuge runs at maximum speed for deoiling with a vertical axis of rotation. The tilting device is automatically locked and the ejected oil flows through the outlet into a drain.
• the centrifuge After a sufficient spin time, the centrifuge is braked and tipped into the scrubbing wash position. In this position, the centrifuge drum is driven so slowly that the objects in it are treated as in a scouring bell. Via an inlet on the centrifuge lid, an alkaline liquid at 80 ° C., optionally with an anti-rust agent, is added to the drum. After completion of the washing process, the washing liquor used is pumped back into a storage container via the two-way valve.
• the drum located in the inclined position is set in somewhat faster rotation so that the objects to be treated can redistribute themselves in the centrifuge drum.
• a large part of the cleaning and washing liquid used flows back into a collection or storage container via the two-way valve. Only then is the centrifuge drum tilted back into the vertical centrifuging position, hydraulically locked and set at maximum number of revolutions - for example 1000 revolutions per minute - and the remaining liquid is thrown out. In this last step, drying is supported by the supply of hot air. After the centrifuge is braked, the lid opens automatically, the insert can be grasped, removed and brought to the dumping station.
• FIG. 1 shows a sectional view through a centrifuge in the vertical centrifuging position along a cutting line running through the drive shaft
• FIG. 2 shows a representation corresponding to FIG. 1 for a centrifuge in the scrubbing washing position, in which the axis of rotation of the centrifuge is tilted with respect to the vertical.
• Fig. 3 is a sectional view corresponding to Fig. 1 in a modified embodiment of the centrifuge according to the invention.
• FIG. 4 shows an enlarged detail from FIG. 3.
• the centrifuge shown in FIGS. 1 and 2 has a centrifuge drum 1 which is attached to the drive shaft 2 of an electric motor s3.
• the motor 3 is held in the base frame 6 of the centrifuge via a pin 4 and an elastic mounting 5.
• the underframe 6 is fastened on a swivel frame 7 which is articulated on the base frame 9 anchored about the axis 8.
• a centrifuge housing 10 is fastened, which surrounds the motor 3 and the centrifugal drum 1 and can be locked by a housing cover 11.
• the housing cover 11 has a closure 12 which only allows the drive motor 3 to be switched on in the locked position.
• a hot air duct 13 is also attached to the cover, via which hot air can be fed to the centrifuge drum 1. Furthermore, a feed line 14 is arranged on the cover, through which cleaning or rinsing agent can be fed to the centrifuge drum 1.
• An insert 15 can be used in the centrifuge drum 1.
• the collecting housing 16 surrounding the centrifuge drum 1 has in its deepest area an outlet 17 which can be shut off by means of a two-way valve 18. As can be seen from Fig. 2, the outlet 17 is the lowest point of the collecting housing 16 when the centrifuge is in a tilted position.
• a cylinder / piston unit 20 is arranged between the base frame 9 and the centrifuge and can move the centrifuge into the tilted position shown in FIG. 2. By means of a pressure accumulator, not shown, the locking can take place under high pretension.
• the cylinder / piston unit 20 is articulated on the one hand on an abutment 21 which is fixedly connected to the base plate 9 and on the other hand on an abutment 22 which is fixedly connected to the base frame 6 on the centrifuge housing 10 or via reinforcing strips 19.
• the hinged side of the centrifuge is supported on a support bar 23 connected to the base frame 9.
• the centrifuge drum 1 In the vertical centrifuging position shown in FIG. 1, the centrifuge drum 1 should be able to rotate at a high number of revolutions of, for example, 1000 revolutions per minute. This makes it necessary for the centrifuge housing 10 to be firmly connected to the base frame 9 via the swivel frame 7 during the spinning phase.
• the cylinder-piston unit 20 can therefore expediently be locked hydraulically.
• the centrifuge is pressed with high pressure coming from the pressure accumulator by the cylinder-piston unit 20 against the stops determining the tilting position and the normal position.
• In the vicinity of the support bar 23 can also be a Example, electromagnetically activated, mechanically acting lock can be arranged. However, it is expedient to select a cylinder-piston unit 20 in which the piston can be hydraulically loaded on both sides, so that hydraulic locking can also take place under high prestress in the tilted position.
• the shut-off part 18 has at least two switching positions. In one switching position, the spun off liquid, in particular oil, is led via the discharge nozzle 25 into a collecting container, in a second switching position the outlet 17 is connected via the discharge nozzle 26 to a collecting container for the detergent and detergent.
• the centrifugal drum 1 can be filled with cleaning liquid up to the lowest point of the upper edge 29 of the conical jacket 28.
• the conical jacket 28 can be dispensed with if the centrifuge drum 1 is conical in such a way that the spun off liquid is spun off into the collecting housing 16 at the upper edge of the centrifuge drum 1.
• the drum shell is cylindrical and the passage openings of the drum shell are arranged in the lower region of the drum, then a conical shell 28 is necessary. This jacket 28 also discharges the spun off liquid over its upper edge 29.
• FIG. 3 and 4 show a modified embodiment of the centrifuge according to the invention, in which, in addition to the drive motor 3, an additional drive motor is provided which drives the centrifuge drum 1 via a friction wheel drive 30 in the tilted position of the centrifuge at a low speed.
• the centrifuge drum 1 is rigidly connected to a fan wheel 31, to which an essentially horizontal drive ring 35 is attached.
• a friction wheel 32 can be pressed against this drive ring 35, the axis 33 of which can be driven via a scratch 34 and is mounted in the guide block 39 via a roller bearing 40.
• the guide block 39 is guided in a guide housing 38 attached to the centrifuge 10 and displaceable at right angles to the plane of the drive ring 35.
• a hydraulic piston cylinder unit 36 acts on the guide block 39, the upper end of which is articulated on a bearing block 37 attached to the centrifuge housing 10
• the arrangement of an additional drive motor is advantageous. Since the unbalance of the drum filled with the material to be treated is also small at low speed, the drive power can be transmitted without further ado via the friction wheel 32 to the drive ring 35 connected to the rod 1. The slight vertical movements of the
• Friction wheels 32 can easily be elastically caught by the cylinder-piston unit 36, so that the friction wheel 32 rests on the drive ring 35 with the same force at all times. If the additional drive is switched off, the cylinder-piston unit 36 lowers the guide block 39 and thus also the friction wheel 32 to such an extent that the drive ring 35 can carry out the wobbling movements caused by the unbalance in the drum.
• the method according to the invention can also be carried out in a centrifuge with bottom emptying, in which the drum jacket can be lifted off the bottom of the drum.
• the drum jacket is designed such that the centrifugal openings are as high as possible, that is to say the drum holds as much liquid as possible even in an inclined position.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Centrifugal Separators (AREA)
• Drying Of Solid Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=6022603

Family Applications (1)

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• 1977
  • 1977-10-29 DE DE2748615A patent/DE2748615C2/de not_active Expired
• 1978
  • 1978-10-27 WO PCT/DE1978/000030 patent/WO1979000244A1/de unknown
• 1979
  • 1979-05-07 EP EP78900185A patent/EP0007369A1/de not_active Withdrawn
  • 1979-06-25 US US06/114,091 patent/US4314856A/en not_active Expired - Lifetime
• 1980
  • 1980-01-03 FR FR8000190A patent/FR2446133A1/fr active Granted
• 1981
  • 1981-10-26 US US06/315,207 patent/US4368748A/en not_active Expired - Fee Related

Non-Patent Citations (1)

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