US3718220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the peeling and extracting of solid material from a centrifuge
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1970-07-02
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Granted: 1973-02-27
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Expires: 1990-07-02
Abstract
Abstract A device for the peeling and extracting of solid material from a centrifuge, especially from a vertical centrifuge, during centrifuge operation, the device including a vertical well housing mounted on the centrifuge cover, a vertical extraction tube extending through the housing and into the centrifuge, a sideways extending pickup duct with a peeling head connected to the lower end of the extraction tube, and screw conveyors inside both the pickup duct and the extraction tube. The extraction tube is guided inside the well housing for rotational motion and for vertical motion, so that the peeling head can be approached and retracted from the centrifuge drum wall and moved vertically therealong. Hydraulic cylinders provide the rotational and vertical motions.
Inventors
- 👤 H Titus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:38
CPC Classifications
B; B04; B04B; B04B11/00; B04B11/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
221 words
A device for the peeling and extracting of solid material, particularly of a pasty or sticky consistency from a centrifuge, especially from a vertical centrifuge, during centrifuge operation, comprising in combination: a closed well housing for mounting the device onto an apertured cover of a stationary centrifuge casing; a vertical extraction tube extending through the well housing into the centrifuge at a location between the vertical wall and the central axis of the centrifuge, the extraction tube being sealingly guided in the well housing for vertical and rotational motion relative to the well housing and centrifuge; means for providing vertical motion to the extraction tube relative to the well housing, thereby moving the extraction tube between two vertical end positions; a pickup duct attached to the lower end of the extraction tube and communicating therewith, the general axis of the pickup duct forming an angle with the axis of the extraction tube, the pickup duct having a peeling head with a mouth at an end away from the extraction tube axis; means for providing a rotational motion to the extraction tube relative to the well housing, thereby moving the peeling head between two rotational end positions, approaching and retracting it relative to the vertical wall of the centrifuge; and mechanical conveyor means extending inside the extraction tube and the pickup duct.
Claim 2
Independent Claim
221 words
A device for the peeling and extracting of solid material, particularly of a pasty or sticky consistency from a centrifuge, especially from a vertical centrifuge, during centrifuge operation, comprising in combination: a closed well housing for mounting the device onto an apertured cover of a stationary centrifuge casing; a vertical extraction tube extending through the well housing into the centrifuge at a location between the vertical wall and the central axis of the centrifuge, the extraction tube being sealingly guided in the well housing for vertical and rotational motion relative to the well housing and centrifuge; means for providing vertical motion to the extraction tube relative to the well housing, thereby moving the extraction tube between two vertical end positions; a pickup duct attached to the lower end of the extraction tube and communicating therewith, the general axis of the pickup duct forming an angle with the axis of the extraction tube, the pickup duct having a peeling head with a mouth at an end away from the extraction tube axis; means for providing a rotational motion to the extraction tube relative to the well housing, thereby moving the peeling head between two rotational end positions, approaching and retracting it relative to the vertical wall of the centrifuge; and mechanical conveyor means extending inside the extraction tube and the pickup duct.
Claim 3
Dependent Claim
63 words
The device as defined in claim 1, the extraction tube and pickup duct having substantially cylindrical bores; the mechanical conveyor means being in the form of a pickup screw conveyor rotatably mounted inside the pickup duct, and an extraction screw conveyor rotatably mounted inside the extraction tube; the conveyor means further including means to operably connect the two screw conveyors for simultaneous rotation.
Claim 4
Dependent Claim
41 words
The device as defined in claim 2, the axes of the extraction tube and the pickup duct intersecting one another at an angle of approximately 95 to 120*; the rotary connecting means between the two screw conveyors being a bevel gear.
Claim 5
Dependent Claim
118 words
The device as claimed in claim 3, the pickup duct including a transition casing in the area where it is attached to the extraction tube, the transition casing including: a bevel gear casing sealingly separated from both the pickup duct bore and the extraction tube bore; and a curved pressure duct linking the near ends of the pickup duct bore and extraction tube bore outside the bevel gear casing; the bevel gear casing and the pressure duct having a common curved separating wall, the separating wall including two bores serving both as sealing shaft passages for the inner end of the pickup screw conveyor and the lower end of the extraction conveyor, and also as bearing supports therefor.
Claim 6
Dependent Claim
102 words
The device as claimed in claim 2, the peeling head of the pickup duct having its outer end portion flared to form an enlarged rectangular mouth in the form of a funnel; the pickup screw conveyor having a likewise enlarged diameter in the flared duct portion; the mouth of the peeling head including a vertical peeling edge at its trailing side in the sense of centrifuge rotation, a lower horizontal peeling edge adjacent said vertical peeling edge, and a bearing bracket supporting the outer end of the pickup screw conveyor, the bearing bracket being attached to the leading side of the mouth.
Claim 7
Dependent Claim
109 words
The device as claimed in claim 2, the means to create a rotational motion of the extraction tube including: a radially inwardly extending horizontal bearing shoulder as part of the well housing; a control collar positioned above the bearing shoulder concentrically with the housing axis and rotatably supported and guided on the bearing shoulder; the extraction tube having a cylindrical outer surface, and the control collar having a central guide bore slidably fitting around the extraction tube; a key-and-keyway rotational connection between the control collar and the extraction tube allowing relative vertical motion between the two; and means to rotate the control collar between the two rotational end position.
Claim 8
Dependent Claim
182 words
The device as defined in claim 6, the well housing further including a fixed stop collar located underneath the control collar; the key-and-keyway connection including: a vertical flat key attached to the extraction tube and a matching keyway in the control collar; the lower end of the key being positioned just above the stop collar, when the extraction tube is in its upper end position; the stop collar preventing downward motion of the extraction tube by engaging the lower end of the key in all rotational positions of the extraction tube except in the approached end position of the peeling head, in which position the stop collar has a recess through which the key of the extraction tube can pass downwardly; the rotating means for the control collar including: gear teeth on at least a portion of the periphery of the control collar; a horizontal gear rack in engagement with the teeth on the collar; a power cylinder attached to the well housing and aligned with the gear rack, the gear rack being a part of the plunger of the power cylinder.
Claim 9
Dependent Claim
140 words
The device as defined in claim 6, the means to create the vertical motion of the extraction tube including: a vertical power cylinder aligned adjacent to the extraction tube above the control collar, the lower end of cylinder being supported by the control collar and rotatably entrained therewith; the piston rod of the vertical power cylinder being connected to the well column so as to carry its weight, when the column is lowered and raised; a recess in the control collar in alignment with The power cylinder axis; the piston rod in the power cylinder extending downwardly; a radially extending pin on the extraction tube, the lower end of the piston rod being engaging the pin; the pin and the piston rod end being accommodated within the control collar recess, when the well column is in its upper end position.
Claim 10
Dependent Claim
26 words
The device as claimed in claim 1, the extraction tube including a downwardly oriented discharge tube communicating with the upper end portion of the extraction tube.
Claim 11
Dependent Claim
57 words
The device as claimed in claim 2, the extraction tube including a radially oriented discharge tube communicating with the upper end portion of the extraction tube; the mechanical conveyor means further including a discharge screw conveyor inside the discharge tube and means to operably connect the discharge screw conveyor with the extraction screw conveyor for simultaneous rotation.
Claim 12
Dependent Claim
77 words
The device as claimed in claim 2, the driving means for the mechanical conveyor means including an electric motor and drive transmission means connected to the upper end of the extraction conveyor, the driving means being mounted on the extraction tube for rotational and vertical movement therewith; the bores of the extraction tube and pickup duct surrounding the respective screw conveyors including interrupted longitudinal grooves in their walls to reduce rotation of the solid material during conveyance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |