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US3338418A - Automatic readjusting and feeding device for a hydraulically operated scraping device in a peeling centrifuge - Google Patents

Automatic readjusting and feeding device for a hydraulically operated scraping device in a peeling centrifuge Download PDF

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Publication number
US3338418A
US3338418A US343970A US34397064A US3338418A US 3338418 A US3338418 A US 3338418A US 343970 A US343970 A US 343970A US 34397064 A US34397064 A US 34397064A US 3338418 A US3338418 A US 3338418A
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US
United States
Prior art keywords
piston
cylinder
shaft
slide
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US343970A
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English (en)
Inventor
Koslowski Karl
Schneider Fritz Walter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beteiligungs und Patentverwaltungs GmbH
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Beteiligungs und Patentverwaltungs GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of US3338418A publication Critical patent/US3338418A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof

Definitions

  • the present invention relates to an automatic readjusting and setting device for a hydraulically operated scraping device with a reciprocating as well as a rotating knife shaft in a peeling centrifuge.
  • the peeled solid material is caught in a receptacle or removed from the centrifuge drum by means of a chute or a conveyor screw.
  • the reciprocating movement of the peeling knife in axial direction and the displacement in the respective end positions of the knife shaft is repeated as long until the cake of solid material is scraped out from the centrifuge drum. Thereafter, the peeling knife is returned into its starting position.
  • a piston reciprocating in a hydraulic cylinder which piston is subjected simultaneously to pressure on its opposite faces and which cylinder is arranged outside the centrifuge housing.
  • the rotation of the knife shaft causing the setting of the knife is performed either by a piston of a setting cylinder, which piston is laterally pivoted to the knife shaft, or by a rotary piston coupled with the latter.
  • the automatic readjusting for the reciprocating movement of the knife shaft is performed by a pre-control slide mechanically operated by the knife shaft.
  • a pressure oil connection to the working space of the setting cylinder is, thereby, created for a short time period in the end positions of this pre-control slide and thus the setting movement is obtained.
  • the length of this setting movement of the peeling knife and thus the depth of cutting can, thereby, be adjusted to a certain extent either by adjustable abutments upon the operating members for the pre-control slide or by throttle installations in the pressure oil conduit to the setting cylinder.
  • the dosing slide which anyway does not require substantially more space compared with the known devices, is combined in one single control block jointly with the remaining control members.
  • the readjusting and feeding device according to the present invention makes possible a greater accuracy and safety of the scraping procedure in relation to the known structures in spite of the substantially equal space resetting device;
  • FIG. 2 is a section along the lines 22 of FIG. 1;
  • FIGS. 3, 4 and 5 are schematic cross-sections of the readjusting and setting device at an enlarged scale, disclosing three different positions thereof.
  • the scraping device comprises a centrifuge drum 1 which runs during the scraping in a centrifuge housing 2 at a constant number of revolutions, which is reduced relative to the number of revolutions during the filling operation.
  • the scraping device with its control device is mounted in a housing cover 3. Peeling knives 4 are secured laterally on a knife shaft 6 by means of arms 5 within the centrifuge drum 1.
  • One end of the knife shaft 6, projecting from an opening in the housing cover 3 is a piston 7 which reciprocates in a hydraulic cylinder 8.
  • the cylinder 8 is rotatably mounted in roller bearings 9 within a housing 10 disposed adjacent to the housing cover 3.
  • the hydraulic setting cylinder 14 is swingably mounted in the housing 10 by means of pins 15 (FIG. 1).
  • control block 17 is connected with an oil tank 21 of a program control by means of two hydraulic conduits 19 and 20 and by means of two further hydraulic conduits 22, 23, with both ends of the hydraulic cylinder 8.
  • two further hydraulic conduits 36 and 20 lead to both ends of the setting cylinder 14.
  • the conduits 22, 23, 36 and 20' are flexible, in order to permit the rotary movement of the cylinder 8 and the swinging movement of the cylinder 14, respectively.
  • a pro-control slide 24 is provided in the control block 17, which slide has three annular recesses and reciprocates in a complementary chamber 24'.
  • A- dosing slide is also arranged in the control block 17, which dosing slide comprises two pistons 31 and 32 with a connecting rod 32 and reciprocates in the end chambers 33 and 34, respectively.
  • FIGS. 3-5 of the drawings The structure and the mode of operation of the device designed in accordance with the present invention will be apparent from FIGS. 3-5 of the drawings.
  • the piston 7 and, thereby, also the knife shaft 6 with the knives 4 is disposed in the left end position.
  • pressurized oil is fed now into the conduit 19, while the conduit 20 serves as a return conduit.
  • the pressurized oil is fed from the conduit 19 directly into the conduit 22 and simultaneously, by means of an annular recess 38', provided in a second precontrol slide 38, into the conduit 23.
  • the piston 7 is, thus, simultaneously subjected on both sides to the pressurized oil. Since, however, the left face of the piston 7, subjected to pressure through the conduit 23, is larger, the piston 7 and, thus, the knife shaft 6 move to the right.
  • a piston rod 28 is moved thereby, which piston rod 28 extends with a piston 28 into a cylindrical chamber 28" of the piston 7 and carries a collar 28", by means of engagement with the collar 27 of the piston 7, the piston rod 28 has been moved to the left previously. Since the piston rod 28 is operatively connected with the precontrol slide 24 by means of the two-armed lever 18, the latter is moved also and adjusts itself due to the pressure of two helical springs 25 and 26 in its middle position. The helical springs 25 and 26 engage the two ends of 4 the pre-control slide 24 by means of two movable plates 25' and 26'. Due to this movement, the position disclosed in FIG. 4 has been obtained.
  • the control slide 38 which surrounds the connecting rod 32 annularly in the center portion of the dosing slide and is shown in FIGS. 3 and 4 likewise in its left end position, is joined in the movement shortly before termination of the movement of the dosing slide to the right from the back face of the piston 31 and brought into the right position, shown in FIG. 5. Due to the displacement towards the right of the annular recess 38', the hydraulic conduit 23 is no more connected with the pressure conduit 19, rather with the return conduit 20. The piston 7 is, thus, subjected to pressure only through the conduit 22 and moves, thus, to the left, whereby the control slide 24 is returned again at first into its middle position (FIG. 4) and only shortly before reaching the left end position of the piston 7 arrives in its right end position (FIG. 3).
  • the conduit 29, which is connected continuously with the pressure conduit 19 is, thus, connected with the chamber 34 by means of the conduit 35, whereby the dosing slide is moved again to the left due to the oil pressure effective on the piston 32.
  • the oil displaced by the piston 31 from the chamber 33 is fed into the working chamber 37 of the setting cylinder 14 through the conduits 30 and 36 and produces thereby a further setting movement of the peeling knives 4.
  • the dosing slide joins again, this time with the back face of its piston 32, the control slide 38 during its movement to the left, shortly before reaching its left end position. By this movement, the position disclosed in FIG. 3 is restored again.
  • the piston 13 is returned into its starting position by means of the oil pressure acting through the former return conduit 20 onto the rear face of the piston 13, whereby the oil, displaced from the operative chamber 37, flows off through the conduit 41 and the non-return valve 42 into the present return conduit 19.
  • the scraping device is available for the next scraping cycle.
  • the connecting rod 32 between its pistons 31 and 32 projects laterally from the control block 17 and is formed as a threaded spindle, which is rigidly connected with the piston 32, while the piston 31, secured by a key 31' against rotation, is screwed onto the thread of the spindle.
  • a manually operable gripping device 43 By rotation of the spindle by means of a manually operable gripping device 43 the distance between the pistons 31 and 32 and thus the stroke volume of the dosing slide can be varied according to the particularly desired cutting depth.
  • An automatic readjusting and setting device for a hydraulically operated scraping apparatus comprising a housing,
  • centrifuge drum rotatably mounted in said housing
  • a hydraulically operated scraper device including a shaft having at least one peeling knife extending radially therefrom,
  • said shaft being mounted for rotation and reciprocation in said centrifuge drum
  • said shaft including a piston
  • a first setting cylinder controlling the rotary movement of said shaft and having an operating chamber
  • a hydraulic actuator including said piston
  • said first precontrol slide being periodically shifted to control said pressure and outlet connections to said hydraulic actuator, in order to reciprocate said shaft
  • a second cylinder having a chamber ateach end therea double-acting dosing piston reciprocating in said second cylinder
  • a second pre-control slide including return springs
  • the shifting movement of said closing piston being effective to displace liquid under pressure from said end chamber into said setting cylinder to effect stepwise rotation of said shaft and effecting the periodic shifting of said first pre-controlled slide.
  • the device as set forth in claim 1, which includes means for adjusting the stroke of said dosing piston.

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US343970A 1963-02-23 1964-02-11 Automatic readjusting and feeding device for a hydraulically operated scraping device in a peeling centrifuge Expired - Lifetime US3338418A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK49041A DE1178790B (de) 1963-02-23 1963-02-23 Selbsttaetige Umsteuer- und Zustellvorrichtung fuer einen hydraulisch betaetigten Ausraeumer in einer Schaelzentrifuge

Publications (1)

Publication Number Publication Date
US3338418A true US3338418A (en) 1967-08-29

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ID=7225122

Family Applications (1)

Application Number Title Priority Date Filing Date
US343970A Expired - Lifetime US3338418A (en) 1963-02-23 1964-02-11 Automatic readjusting and feeding device for a hydraulically operated scraping device in a peeling centrifuge

Country Status (5)

Country Link
US (1) US3338418A (de)
CH (1) CH408783A (de)
DE (1) DE1178790B (de)
FR (1) FR1409733A (de)
GB (1) GB1037092A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3446431A (en) * 1966-05-05 1969-05-27 Robatel & Mulatier Atel Centrifugal machines
US3817447A (en) * 1972-01-24 1974-06-18 Escher Wyss Ltd Centrifuge
JPS5659161U (de) * 1979-10-15 1981-05-21
US4381236A (en) * 1981-02-19 1983-04-26 Baker Perkins Inc. High pressure rotary centrifugal separator having apparatus for automatically cyclically reciprocating a corotating separator basket scraper
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1965840A (en) * 1932-11-17 1934-07-10 Sharples Specialty Co Centrifugal machine
DE821478C (de) * 1950-09-01 1951-11-19 Krauss Maffei Ag Automatisch wirkende Druckoelsteuerung fuer Schubzentrifugen
GB779183A (en) * 1954-10-13 1957-07-17 Ohg E Fonderie A Bosco S P A Improvements in or relating to scrapers particularly for rocking centrifugal hydroextractors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE606838C (de) * 1932-06-21 1934-12-12 C G Haubold A G Grossleistungsschleuder mit Fluessigkeitssteuerung fuer den das abgeschleuderte Trockengut austragenden Schaelloeffel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1965840A (en) * 1932-11-17 1934-07-10 Sharples Specialty Co Centrifugal machine
DE821478C (de) * 1950-09-01 1951-11-19 Krauss Maffei Ag Automatisch wirkende Druckoelsteuerung fuer Schubzentrifugen
GB779183A (en) * 1954-10-13 1957-07-17 Ohg E Fonderie A Bosco S P A Improvements in or relating to scrapers particularly for rocking centrifugal hydroextractors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3446431A (en) * 1966-05-05 1969-05-27 Robatel & Mulatier Atel Centrifugal machines
US3817447A (en) * 1972-01-24 1974-06-18 Escher Wyss Ltd Centrifuge
JPS5659161U (de) * 1979-10-15 1981-05-21
US4381236A (en) * 1981-02-19 1983-04-26 Baker Perkins Inc. High pressure rotary centrifugal separator having apparatus for automatically cyclically reciprocating a corotating separator basket scraper
US20210316235A1 (en) * 2019-11-18 2021-10-14 Lg Chem, Ltd. Pressurizing centrifugal dehydrator
US11833458B2 (en) * 2019-11-18 2023-12-05 Lg Chem, Ltd. Pressurizing centrifugal dehydrator

Also Published As

Publication number Publication date
GB1037092A (en) 1966-07-27
FR1409733A (fr) 1965-09-03
CH408783A (de) 1966-02-28
DE1178790B (de) 1964-09-24

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