Patent US3686907A successfully refreshed from Google Patents.
US3686907A
Expired / Lapsed
US
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Device for automatic thickness control of rolled strips
Assignee: Individual
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Filing: 1971-03-04
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Granted: 1972-08-29
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Expires: 1991-03-04
Abstract
Abstract A device for automatic thickness control of rolled strips which ensures an accuracy of the rolled material from + OR - 0.002 mm to + OR - 0.003 mm, does not call for major capital expenses and long stops of the rolling mills for its introduction and is characterized by high operating reliability and simple servicing. The device for automatic thickness control of rolled strips in installations for the manufacture of strip materials, comprising symmetrically located on both sides of the roll stand at least one hydraulic power cylinder installed between the supports of the working rolls, a damping hydraulic cylinder whose piston is fixed while the strip is passing through the roll stand, and a controllable valve connected so that the hydraulic system formed by said hydraulic cylinder and valve is closed and creates a local increase in the rigidity of the roll stand within the range of forces which is approximately equal to the range of variations of the rolling pressure from the preset value. The device has a positive feedback circuit actuated by the fluid pressure in the closed hydraulic system, this circuit comprising a pressure meter in the hydraulic power cylinder, an element for comparing the measured deviation of pressure with the value proportional to the preset coefficient of positive feedback, connected with the pressure meter, and an actuating element connected to said comparison element and to the correcting element made in the form of a hydraulic cylinder communicating with the hydraulic power cylinder.
Inventors
- 👤 Evgeny Vyacheslavovich Sokolov
- 👤 Eduard Petrovich Yashkin
- 👤 Vadim Ivanovich Sysoev
- 👤 Rady Savvich Kozhevnikov
- 👤 Alim Ivanovich Chabanov
- 👤 Mikhail Ivanovich Shinkarenko
- 👤 Petr Stepanovich Grinchuk
- 👤 Georgy Georgievich Fomin
- 👤 Vladimir Ivanovich Rusaev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:44
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/58; B21B37/66; B21B37/62; B21B37/64; B29; B29C; B29C43/00; B29C43/32; B29C2043/3205; B29C2043/325; B29C43/58; B29C2043/5825; B29C43/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
319 words
A device for automatic thickness control of rolled strips in installations manufacturing strip materials and having at least one roll stand with back-up and working rolls, comprising: symmetrically located at each side of said roll stand at least one hydraulic power cylinder installed between the supports of said working rolls; a damping hydraulic cylinder; a piston of said damping hydraulic cylinder, fixed while the rolled strip is passing through the roll stand; a controllable valve, said hydraulic power cylinder, damping cylinder and controllable valve being so connected that they form a closed hydraulic system which ensures a local increase in the rigidity of the roll stand within the range of forces which is approximately equal to the range of rolling pressure deviations from the preset value; a positive feedback circuit actuated by the fluid pressure in said closed hydraulic system comprising a pressure meter in said hydraulic power cylinder and communicating hydraulically with the latter, and a comparison element for comparing the measured deviation of pressure with the value which is proportional to the preset coefficient of positive feedback, connected with said pressure meter, an actuating element connected to said comparison element, and a correcting element made in the form of a hydraulic cylinder communicating hydraulically with said hydraulic power cylinder and mechanically with said actuating element; when pressure in said closed hydraulic system deviates from the preset value which is caused by the corresponding deviation of the pressure exerted by the rolled strip on the working rolls, the piston of said correcting hydraulic cylinder moves in the direction of the increased deviation of pressure in said closed hydraulic system as a result of a signal produced at the output of said comparison element, said signal acting via said actuating element on said correcting element until the value proportional to the preset coefficient of positive feedback and to the movement of the piston counterbalances the value of pressure deviation.
Claim 2
Independent Claim
319 words
A device for automatic thickness control of rolled strips in installations manufacturing strip materials and having at least one roll stand with back-up and working rolls, comprising: symmetrically located at each side of said roll stand at least one hydraulic power cylinder installed between the supports of said working rolls; a damping hydraulic cylinder; a piston of said damping hydraulic cylinder, fixed while the rolled strip is passing through the roll stand; a controllable valve, said hydraulic power cylinder, damping cylinder and controllable valve being so connected that they form a closed hydraulic system which ensures a local increase in the rigidity of the roll stand within the range of forces which is approximately equal to the range of rolling pressure deviations from the preset value; a positive feedback circuit actuated by the fluid pressure in said closed hydraulic system comprising a pressure meter in said hydraulic power cylinder and communicating hydraulically with the latter, and a comparison element for comparing the measured deviation of pressure with the value which is proportional to the preset coefficient of positive feedback, connected with said pressure meter, an actuating element connected to said comparison element, and a correcting element made in the form of a hydraulic cylinder communicating hydraulically with said hydraulic power cylinder and mechanically with said actuating element; when pressure in said closed hydraulic system deviates from the preset value which is caused by the corresponding deviation of the pressure exerted by the rolled strip on the working rolls, the piston of said correcting hydraulic cylinder moves in the direction of the increased deviation of pressure in said closed hydraulic system as a result of a signal produced at the output of said comparison element, said signal acting via said actuating element on said correcting element until the value proportional to the preset coefficient of positive feedback and to the movement of the piston counterbalances the value of pressure deviation.
Claim 3
Dependent Claim
92 words
A device according to claim 1, wherein its positive feedback circuit is of the hydromechanical type and comprises a hydraulic cylinder serving as an actuating element; a control valve whose space is in hydraulic communication with said hydraulic cylinder; a second hydraulic cylinder serving as a pressure meter and whose piston is linked kinematically with one of the ends of the piston of said control valve; a flexible element connected to the other end of the piston of said control valve and linked kinematically with the piston of said correcting hydraulic cylinder.
Claim 4
Dependent Claim
71 words
A device according to claim 1, wherein the positive feedback circuit is of the electromechanical type and comprises a divider functioning as a setter of the positive feedback coefficient and connected to said pressure meter and to said comparison element, an electromechanical means for converting electrical voltage into motion with negative feedback actuated by said motion, connected to said comparison element and linked with the piston of said correcting hydraulic cylinder.
Claim 5
Dependent Claim
28 words
A device according to claim 1, comprising a channel for controlling the thrust of saId working rolls, said channel stabilizing the thrust with relation to the preset value.
Claim 6
Dependent Claim
29 words
A device according to claim 4, wherein said working roll thrust control channel controls the pressure in hydraulic cylinders installed between each pair of supports of said back-up rolls.
Claim 7
Dependent Claim
21 words
A device according to claim 4, wherein said working roll thrust control channel controls the electrical drive of the pressure screws.
Claim 8
Dependent Claim
82 words
A device according to claim 5, wherein said working roll thrust control channel comprises a working roll thrust setter; a pressure meter for measuring pressure in the hydraulic power cylinder; a control valve hydraulically communicating with the hydraulic cylinder installed between the supports of the back-up rolls; a movable piston of said control valve one end of which is kinematically connected with said pressure meter of the thrust control channel while its other end is connected to said working roll thrust setter.
Claim 9
Dependent Claim
69 words
A device according to claim 5, wherein said working roll thrust control channel comprises a correcting element in the form of a hydraulic cylinder communicating hydraulically with the hydraulic cylinder installed between the supports of said back-up rolls; an electromechanical means for converting electrical voltage into motion, mechanically connected with the piston of said correcting hydraulic cylinder and electrically connected with said pressure meter of said positive feedback channel.
Claim 10
Dependent Claim
146 words
A device according to claim 1, which has a channel for programmed correction of working roll machining inaccuracies, this channel comprising: a memory unit for memorizing the variations of pressure in said hydraulic power cylinder as a function of the turning angle of the working rolls; a unit for measuring the current values of the working roll turning angle; an electromechanical means for converting electrical voltage into motion, connected electrically to said memory unit and to the unit for measuring current values of turning angles; one more correcting hydraulic cylinder hydraulically connected with said hydraulic power cylinder, the piston of the correcting cylinder being coupled with said electromechanical means of the programmed correction channel; a control unit for controlling said memory unit and current value measuring unit which ensures synchronization of the action of said units on said electromechanical conversion means in the programmed correction channel.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |