Patent US3693385A successfully refreshed from Google Patents.
US3693385A
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US
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Fluid control system for selectively self-adjusting mill reduction force or interworking roll distance
Assignee: Ube Corp
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Filing: 1970-09-23
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Granted: 1972-09-26
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Expires: 1990-09-23
Abstract
Abstract A fluid control system for selectively self-adjusting mill reduction force or inter-working roll distance or roll gap comprising a variable discharging plunger pump having one port connected to a hydraulic cylinder adapted to apply pressure on working rolls in a mill and the other port connected to a fluid supply source. A servo valve is provided for deflecting deflection means in one or the other direction to control the discharge direction and discharge amount of said pump. In order to detect an existing value of mill reduction force, a fluid pressure detector is provided for electrically detecting fluid pressure in a fluid passage adapted to be connected to said hydraulic cylinder. A detector is provided for producing an electrical signal in response to the position of the ram of the cylinder. The servo valve operates in response to a result of a comparison between signals from the above-mentioned detectors and a reference value and thereby fluid is controlled so that the fluid may be in a predetermined direction and a predetermined amount so as to self-adjust mill reduction force or inter-working roll distance.
Inventors
- 👤 Kiyoshi Fujino
- 👤 Shigenobu Otsuka
- 👤 Tetuo Kaichi
- 👤 Takaharu Sugiyama
- 👤 Koji Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:09
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/58; B21B37/62
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
329 words
In a fluid control system for controlling mill reduction in a mill having hydraulic cylinders on the working and driving sides of the mill in pressure applying relation to working rolls in said mill, comprising variable discharge plunger pump means for supplying said hydraulic cylinders with fluid, respectively, said pump means including deflection means for stopping flow of fluid from or to ports in a neutral position and for discharging fluid from one port and sucking in fluid at another port when said deflection means is in one deflected position or discharge fluid from said other port and suck in at said one port when said deflection means is in the other deflected position; a fluid pressure detector for electrically detecting fluid pressure at said one port of the pump means; an inter-working roll distance detector for electrically detecting the position of the ram in each of said hydraulic cylinders; reduction force setting means for producing a preset signal corresponding to a predetermined value at said one port of the pump means; inter-working roll distance setting means for producing a preset signal required for predetermining the position of the ram in each of said hydraulic cylinders; a deflection means for producing a position signal in response to the position of said deflection means of said pump means; servo means including a servo valve for displacing said deflection means of the pump means in a required direction and by a required distance and a torque motor for operating said servo valve; a differential amplifier having inputs adapted to be supplied with a signal S3 from said deflection means and a signal selected from a differential signal (S1) obtained from said reduction force setting means and a signal from said pressure detector and a differential signal (S2) obtained from said interworking roll distance detector, outputs of said differential amplifier being connected to inputs of said torque motor; and selecting means for selecting either said first-mentioned signal or said second-mentioned differential signal.
Claim 2
Dependent Claim
329 words
In a fluid control system for controlling mill reduction in a mill having hydraulic cylinders on the working and driving sides of the mill in pressure applying relation to working rolls in said mill, comprising variable discharge plunger pump means for supplying said hydraulic cylinders with fluid, respectively, said pump means including deflection means for stopping flow of fluid from or to ports in a neutral position and for discharging fluid from one port and sucking in fluid at another port when said deflection means is in one deflected position or discharge fluid from said other port and suck in at said one port when said deflection means is in the other deflected position; a fluid pressure detector for electrically detecting fluid pressure at said one port of the pump means; an inter-working roll distance detector for electrically detecting the position of the ram in each of said hydraulic cylinders; reduction force setting means for producing a preset signal corresponding to a predetermined value at said one port of the pump means; inter-working roll distance setting means for producing a preset signal required for predetermining the position of the ram in each of said hydraulic cylinders; a deflection means for producing a position signal in response to the position of said deflection means of said pump means; servo means including a servo valve for displacing said deflection means of the pump means in a required direction and by a required distance and a torque motor for operating said servo valve; a differential amplifier having inputs adapted to be supplied with a signal S3 from said deflection means and a signal selected from a differential signal (S1) obtained from said reduction force setting means and a signal from said pressure detector and a differential signal (S2) obtained from said interworking roll distance detector, outputs of said differential amplifier being connected to inputs of said torque motor; and selecting means for selecting either said first-mentioned signal or said second-mentioned differential signal.
Claim 3
Dependent Claim
41 words
A system as set forth in claim 1, in which said plunger pump means is a radial plunger pump and said deflection means is a slide block which is eccentric with respect to the axis of a rotor of said pump.
Claim 4
Dependent Claim
67 words
A system as set forth in claim 1, in which said plunger pump means is an axial plunger pump and said deflection means includes an inclining block engaged by said plunger and having a receptacle which receives said block in a rotational engagement relation with the block and a slide block for inclining said receptacle at a required angle with respect to the axis of said pump.
Claim 5
Dependent Claim
73 words
A system as set forth in claim 1, in which said fluid pressure detector comprises a differential transformer including a primary winding connected to an AC source, two secondary windings having the same umber of turns and differentially connected to each other, an armature to be magnetically linked to said primary and secondary windings and a Bourdon''s tube mechanically connected to said armature for extending or retracting in response to said fluid pressure.
Claim 6
Dependent Claim
46 words
A system as set forth in claim 1, in which said reduction force setting means includes first potentiometers each one disposed on the working and driving sides of said mill and each having cooperating windings for displacement in the same direction and by the same distance.
Claim 7
Dependent Claim
47 words
A system as set forth in claim 5, in which said reduction force setting device includes second potentiometers disposed on said working and driving sides of the mill to be independently adjusted of each other and said last-mentioned potentiometers are in series connected to said first potentiometers.
Claim 8
Dependent Claim
70 words
A system as set forth in claim 1, in which said deflection means position detector comprises a differential transformer consisting of a primary winding connected to an AC source, two secondary windings having the same number of turns and differentially connected to each other and an armature to be magnetically linked to said primary and secondary windings said armature being displaceable in response to any displacement of said deflection means.
Claim 9
Dependent Claim
95 words
A system as set forth in claim 1, in which said inter-roll distance setting means is a digital pulse generator for producing a digital reference signal corresponding to said required inter-roll distance and said inter-roll distance detector is a digital pulse generator for producing a digital signal corresponding to the position of the ram or piston of said cylinder, said output windings of the fluid pressure detecting differential transformer being connected to an analog - digital converter on the output of which a digital signal corresponding to the output signal of said transformer is produced.
Claim 10
Dependent Claim
56 words
A system as set forth in claim 8, in which said system further comprises a comparator whereby a digital signal from said first-mentioned pulse generator is compared with a digital signal from said second-mentioned pulse generator and with a digital signal from said analog-digital converter, the output of said converter being connected to said digital-analog converter.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |