US3669176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive system for continuous casting plants
Assignee: Siemens AG
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Filing: 1969-09-18
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Granted: 1972-06-13
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Expires: 1989-09-18
Abstract
Abstract A drive system for drawing a strand-shaped casting out of the mold of a continuous casting plant comprises drive rollers engageable with the strand and mechanically driven by an electrohydraulic stepping motor which is controlled by electrical pulses from a programmable monitor so that the casting is drawn in accordance with a predetermined operating sequence, preferably such that after a given drawing travel the drive rollers remain at rest or are reversely driven in accordance with the cooling and contraction of the previously drawn strand of material, whereafter the drawing and contraction cycle is repeated.
Inventors
- 👤 Heribert Krall
- 👤 Helmut Maag
- 👤 Otto Herrmann
- 👤 Rudolf Posl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:33
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/12; B22D11/128; B22D11/1284
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A drive system for drawing a continuous strand casting out of the mold of a continuous casting plant, comprising drive roller means engageable with the strand casting leaving the mold, a first electrohydraulic stepping motor in mechanical driving connection with said roller means for driving them in response to electrical signal pulses, a second electrohydraulic stepping motor for displacing the mold, and a pulse transmitting monitor electrically connected to said first and second stepping motors for programmed conjoint control of said first and second stepping motors by the same sequences of electrical pulses, said monitor comprising means for generating and supplying said electrohydraulic stepping motors with alternating and mutually time-spaced sequences of electrical signal pulses so as to draw the strand casting in incremental lengths of travel out of the mold and insErting an interval of rest between successive travel periods.
Claim 2
Dependent Claim
141 words
A drive system for drawing a continuous strand casting out of the mold of a continuous casting plant, comprising drive roller means engageable with the strand casting leaving the mold, a first electrohydraulic stepping motor in mechanical driving connection with said roller means for driving them in response to electrical signal pulses, a second electrohydraulic stepping motor for displacing the mold, and a pulse transmitting monitor electrically connected to said first and second stepping motors for programmed conjoint control of said first and second stepping motors by the same sequences of electrical pulses, said monitor comprising means for generating and supplying said electrohydraulic stepping motors with alternating and mutually time-spaced sequences of electrical signal pulses so as to draw the strand casting in incremental lengths of travel out of the mold and insErting an interval of rest between successive travel periods.
Claim 3
Dependent Claim
30 words
A drive system according to claim 1, comprising pulse-frequency dividers interposed between said monitor and said two electrohydraulic motors for maintaining a desired ratio of travel between said two motors.
Claim 4
Dependent Claim
131 words
A drive system for drawing a continuous strand casting out of the mold of a continuous casting plant, comprising drive roller means engageable with the strand casting leaving the mold, an electrohydraulic stepping motor in mechanical driving connection with said roller means for driving them in response to electrical signal pulses, and a pulse transmitting monitor electrically connected to said stepping motor for programmed control of said stepping motor, said monitor comprising means for generating and supplying said electrohydraulic stepping motor with alternating and mutually time-spaced sequences of electrical signal pulses and means for changing each second one of two pulse sequences to motor operation in the reverse direction and means for reducing the number of pulses in the second sequence relative to the number of pulses in the first sequence.
Claim 5
Dependent Claim
131 words
A drive system for drawing a continuous strand casting out of the mold of a continuous casting plant, comprising drive roller means engageable with the strand casting leaving the mold, an electrohydraulic stepping motor in mechanical driving connection with said roller means for driving them in response to electrical signal pulses, and a pulse transmitting monitor electrically connected to said stepping motor for programmed control of said stepping motor, said monitor comprising means for generating and supplying said electrohydraulic stepping motor with alternating and mutually time-spaced sequences of electrical signal pulses and means for changing each second one of two pulse sequences to motor operation in the reverse direction and means for reducing the number of pulses in the second sequence relative to the number of pulses in the first sequence.
Claim 6
Independent Claim
113 words
The method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers, which method comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually time-spaced sequences of electrical pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, including supplying to the electrohydraulic motor a number of sequential electrical pulses for forward rotation and thereafter a smaller number of pulses for reverse rotation so as to compensate for contraction of the strand.
Claim 7
Independent Claim
113 words
The method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers, which method comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually time-spaced sequences of electrical pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, including supplying to the electrohydraulic motor a number of sequential electrical pulses for forward rotation and thereafter a smaller number of pulses for reverse rotation so as to compensate for contraction of the strand.
Claim 8
Independent Claim
103 words
The method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers, which method comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually time-spaced sequences of electric pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, separately displacing the mold by means of another electrohydraulic stepping motor, and conjointly controlling the two motors by the same sequences of electrical pulses.
Claim 9
Independent Claim
103 words
The method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers, which method comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually time-spaced sequences of electric pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, separately displacing the mold by means of another electrohydraulic stepping motor, and conjointly controlling the two motors by the same sequences of electrical pulses.
Claim 10
Independent Claim
117 words
The method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers, which method comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually time-spaced sequences of electric pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, separately displacing the mold by means of another electrohydraulic stepping motor, conjointly controlling the two motors by the same sequences of electrical pulses and applying pulse-frequency division for maintaining a given ratio of travel between the two motors.
Claim 11
Independent Claim
117 words
The method of drawing a continuous strand casting out of the mold of a continuous casting plant with the aid of drive rollers engaging the strand and an electrohydraulic stepping motor mechanically driving the rollers, which method comprises electrically controlling the electrohydraulic stepping motor by discrete and mutually time-spaced sequences of electric pulses so as to draw the strand casting in incremental lengths of travel out of the mold and inserting an interval of rest between successive travel periods, separately displacing the mold by means of another electrohydraulic stepping motor, conjointly controlling the two motors by the same sequences of electrical pulses and applying pulse-frequency division for maintaining a given ratio of travel between the two motors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |