CN102230068A - Driving mechanism of billet heating furnace flue damper and control method thereof - Google Patents
Driving mechanism of billet heating furnace flue damper and control method thereof Download PDFInfo
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- CN102230068A CN102230068A CN 201110126621 CN201110126621A CN102230068A CN 102230068 A CN102230068 A CN 102230068A CN 201110126621 CN201110126621 CN 201110126621 CN 201110126621 A CN201110126621 A CN 201110126621A CN 102230068 A CN102230068 A CN 102230068A
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Abstract
The invention discloses a driving mechanism of a billet heating furnace flue damper. The driving mechanism includes a speed reducer (2), and the output shaft of a motor (1) is in connection with the input shaft of the speed reducer (2), a speed reducer output shaft (3) on the speed reducer (2) is provided with an output shaft rocking bar (4) that is perpendicular to the axis of the speed reducer output shaft (3) and is in fastened connection with the speed reducer output shaft (3). The rotating shaft of the flue damper (9) is equipped with a flue damper rocking bar (7) that is perpendicular to the axis of the rotating shaft of the flue damper and is in fastened connection with the rotating shaft of the flue damper. The speed reducer output shaft (3) is in parallel with the rotating shaft of the flue damper (9), and the flue damper rocking bar (7) is hinged to the output shaft rocking bar (4) through a connection swing rod (6), thus forming a paralleled double-crank mechanism. In addition, the invention also provides a control method of the driving mechanism. With the technical scheme of the method, the flue damper can operate stably and reliably with good actual use effect. Meanwhile, the failure rate is reduced, the work output of workers is also reduced, and the product quality is improved.
Description
Technical field
The invention belongs to the technical field of metallurgical industry production unit, relate to the device control technology of billet heating furnace, more particularly, the present invention relates to a kind of billet heating furnace flue shutter driving mechanism.In addition, the invention still further relates to the control method of this driving mechanism.
Background technology
For billet heating furnace, waste gas and the certain pressure (being generally pressure-fired) of maintenance burner hearth in order to discharge the burner hearth internal combustion are provided with flue shutter (being valve) in flue.Control exhaust smoke level by the opening degree of regulating flue shutter, and then the control furnace pressure.
At present,, generally adopt pneumatic actuator to drive, utilize Valve positioner to realize the opening degree control of valve for the flue shutter of process furnace; Also there is the oil motor of employing to drive, utilizes the surge generator (being encoder) that is installed on the transmission rig to detect the opening degree of valve, and then realize the opening degree closed-loop control of valve through step-down gear.
Flue shutter not only will accurately be controlled furnace pressure, also will guarantee the safe operation of stove under the accidental state.Adopt the pneumatic actuator of Valve positioner control to drive flue shutter, not only can guarantee the accurate control of furnace pressure and the needs of a large amount of combustion emissions, and because Valve positioner and pneumatic actuator are insensitive to the thermal environment around the flue, its serviceability is higher.But when the air failure of pneumatic actuator or automatically controlled signal accident were interrupted, flue shutter can only close or open fully fully, and the state that can not remain on before the accident is motionless.Flue shutter is closed, and a large amount of products of combustion can not in time be discharged, and causes furnace pressure moment to raise fast, and a large amount of high-temperature furnace gas cause damage from ejections such as fire doors to stove district equipment, also easily produce the personnel safety accident; Flue shutter is opened fully, and powerful stack draught descends fire box temperature fast, causes calorific loss.
Adopt oil motor, when step-down gear drives flue shutter and adopt encoder to detect its opening degree, usually oil motor is controlled by a cover hydraulic drive mechanism is installed in its vicinity, this hydraulic drive mechanism contains an automatically controlled signal power magnification plate usually, and the ratio adjusting valve of a band pilot valve or the like.Because the envrionment temperature around the flue shutter is higher, automatically controlled signal power magnification plate in the hydraulic drive mechanism and encoder are difficult to maintain a long-term stability and move reliably, often the problem because of automatically controlled signal power magnification plate causes the process furnace flue shutter to drive, and causes thus that furnace pressure is too high, process furnace is flame-out; In addition, cause flue shutter actual aperture degree to show because of the flue shutter opening degree detects encoder fault sometimes, bring difficulty for thus process furnace safety operation and operation.
Ma Gangda H type steel production line process furnace flue shutter is original, and what adopt is exactly that the mode of oil motor, step-down gear and encoder is controlled, and breaks down often in actual moving process.
In the prior art, flue shutter servo apply hydraulic pressure system, fault takes place frequently, and the frequent jam of flue shutter can not be controlled automatically, needs artificial Field adjustment.Usually four faults take place in the every monthly average of flue shutter, and each fault effects was produced about 15 minutes, 150 tons of meters of output by the hour, and it is 15 * 12 * 150/60=450 ton that this type of fault year influences output.When breaking down, the furnace pressure fluctuation is big, and furnace pressure departs from 5 millimeter water column, and the stove unit consumption rises more than 12%, and only this year wastes energy about 40000 yuan.In addition, the furnace pressure shakiness causes the oxidation of steel billet in the stove, and loss can't be calculated.Flue shutter hydraulic efficiency servo-system maintenance cost height, 1 year is about 30000 yuan.
Summary of the invention
The problem that the present invention at first will solve provides a kind of billet heating furnace flue shutter driving mechanism, its objective is to realize stable, the operation reliably of flue shutter.
To achieve these goals, the technical scheme taked of the present invention is:
Billet heating furnace flue shutter driving mechanism provided by the present invention, described driving mechanism is provided with motor, the rotating shaft of described flue shutter overlaps with the plate body of flue shutter and the center of circle by flue shutter, it is characterized in that: described driving mechanism is established step-down gear, the output shaft of described motor is connected with the input shaft of step-down gear, establishes on the speed reducer output shaft on the described step-down gear and its axis normal and the output shaft rocking bar that is fastenedly connected; Establish in the described flue shutter rotating shaft and its axis normal and the flue shutter rocking bar that is fastenedly connected; Described speed reducer output shaft and flue shutter shaft parallel, described flue shutter rocking bar is articulated and connected by being connected fork with the output shaft rocking bar, constitutes parallel double crank mechanism.
In the both sides of the turning direction of described flue shutter rocking bar, establish flue shutter rocking bar positive stop.
Near described output shaft rocking bar plane of rotation, the flashboard position control is set detects element.
It is the nearly switch of a winding that described flashboard position control detects element.
Described flashboard position control detects element and adopts 11 polarity formulas or mechanical detection switch, detect 11 opening degree positions of flue shutter, be respectively 0% opening degree, 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree and 100% opening degree; Described 0% opening degree is flue shutter contract fully position; Described 100% opening degree is the full open position of flue shutter.
Described 11 polarity formulas or mechanical detection switch are to be provided with on the correspondence position of the quadrant of speed reducer output shaft concentric discs.
In order to realize the purpose identical with technique scheme, the present invention also provides the control method that is applied to above-described billet heating furnace flue shutter driving mechanism, and its technical scheme is:
11 opening degree display fields of flue shutter are set on the furnace operation station, corresponding 0% opening degree of difference, 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree and 100% opening degree, and be the rough opening degree of flue shutter, and 11 rough opening degree position display hurdles are associated with 11 numeric type work outpuies of Controlling System respectively, described 11 numeric type work outpuies are respectively: Q
Yz1, Q
Yz2, Q
Yz3, Q
Yz4, Q
Yz5, Q
Yz6, Q
Yz7, Q
Yz8, Q
Yz9, Q
Yz10And Q
Yz11
When the pairing digital quantity of one of them opening degree display field was output as ' 1 ' state, the expression flue shutter was in the pairing rough opening degree of this display field position;
The actual rough opening degree display control program of this flue shutter is made up of 11 rest-set flip-flops and 11 OR-circuits respectively, 11 rough opening degrees at flue shutter show point, in sequence of control, realize showing memory to its opening degree point with a rest-set flip-flop and 1 OR-circuit respectively with the segmentation that realizes the flue shutter opening degree;
For 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree, adopt the asserts signal of the detector switch signal of flue shutter place opening degree check point, and the detector switch signal of this opening degree left and right sides adjacent apertures degree check point is as the reset signal of the pairing triggering device Q end of this opening degree as the pairing triggering device Q end of this opening degree;
Show that for 0% opening degree point and 100% opening degree show point, adopt the asserts signal of the detector switch signal of opening degree check point separately as the pairing triggering device Q end of its opening degree; Because their adjacent apertures degree check point has only one, so, in sequence of control, both opening degrees show the only detector switch signal of a corresponding adjacent apertures degree check point that resets of the pairing rest-set flip-flop Q end of point, are respectively 10% opening degree detector switch signal and 90% opening degree detector switch signal.
The present invention adopts technique scheme, makes flue shutter stable, reliable, and practical effect is fine, has reduced failure rate, has alleviated operator's labor capacity, has improved quality product.
Description of drawings
Below expressed content of each width of cloth accompanying drawing of this specification sheets and the mark among the figure are made brief description:
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the actual rough opening degree display control program block diagram of flue shutter.
Be labeled as among the figure:
1, motor, 2, step-down gear, 3, speed reducer output shaft, 4, the output shaft rocking bar, 5, the flashboard position control detects element, and 6, connect fork, 7, the flue shutter rocking bar, 8, flue shutter rocking bar positive stop, 9, flue shutter, 10, flue shutter rocking bar joint flange.
Embodiment
Contrast accompanying drawing below, by description to embodiment, to effect and principle of work, the manufacturing process of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and manipulate method etc., be described in further detail, inventive concept of the present invention, technical scheme had more complete, accurate and deep understanding to help those skilled in the art.
Structure of the present invention as Fig. 1 expresses is a kind of billet heating furnace flue shutter driving mechanism, and described driving mechanism is provided with motor 1, and the rotating shaft of described flue shutter 9 overlaps and pass through the center of circle of flue shutter 9 with the plate body of flue shutter 9.
Used motor is squirrel-cage (cage modle) asynchronous motor on this flue shutter driving mechanism, can selected parameter be: rated output 0.75kw, specified speed 1390r/min.
In order to solve the problem that exists at the described present known technology of this specification sheets background technology part and to overcome its defective, realize flue shutter goal of the invention stable, that move reliably, the technical scheme that the present invention takes is:
As shown in Figure 1, billet heating furnace flue shutter driving mechanism provided by the present invention is established step-down gear 2, the output shaft of described motor 1 is connected with the input shaft of step-down gear 2, establishes on the speed reducer output shaft 3 on the described step-down gear 2 and its axis normal and the output shaft rocking bar 4 that is fastenedly connected; Establish in described flue shutter 9 rotating shafts and its axis normal and the flue shutter rocking bar 7 that is fastenedly connected; Described speed reducer output shaft 3 and flue shutter 9 shaft parallels, described flue shutter rocking bar 7 is articulated and connected by being connected fork 6 with output shaft rocking bar 4, constitutes parallel double crank mechanism.
Described step-down gear 2 can be selected cycloidal planetary gear speed reducer for use, and its reduction ratio is i=2537; Described driving mechanism is made up of institutes such as the rotating shaft of the output shaft rocking bar 4 on motor 1, step-down gear 2, speed reducer output shaft 3, speed reducer output shaft joint flange, the speed reducer output shaft 3, the middle connection fork 6 that connects usefulness, flue shutter rocking bar 7, flue shutter rocking bar joint flange 10, flue shutter 9, flue shutters 9.
For the angle of rotation of the angle of rotation that makes flue shutter 9 and speed reducer output shaft 3 synchronous, make speed reducer output shaft joint flange radius add the length of output shaft rocking bar 4, add that with the radius of flue shutter rocking bar joint flange flue shutter rocking bar length has identical size, and the output shaft rocking bar 4 of step-down gear 2 is parallel to each other at grade with flue shutter rocking bar 7, has promptly constituted described parallel double crank mechanism.
The motor 1 of flue shutter driving mechanism is controlled by forward and reverse contactor, and flue shutter 9 was opened when motor 1 was rotated in the forward, and flue shutter 9 is closed during motor 1 reverse rotation.Like this, when flue shutter driving mechanism motor moved under specified speed, the rotating speed of its driving mechanism speed reducer output shaft only was 0.55r/min, under this speed, and the opening degree that furnace operation worker can more accurate ground manual regulation flue shutter 9.
For the flue shutter electric driving mechanism, because on-the-spot drive disk assembly only is a squirrel-cage asynchronous motor and a cycloidal planetary gear speed reducer, like this, drive disk assembly is because of being difficult for the very high serviceability that has influenced by ambient temperature, and when the electrical control system of driving mechanism breaks down or during the inlet wire power failure, because the power supply of the electric motor of electric driving mechanism is interrupted, flue shutter 9 will remain on original position, like this, even under the situation that flue shutter 9 can not be regulated, process furnace still can be in normal working order.
For billet heating furnace, in works better, when furnace pressure is in automatic control mode, process furnace combustion control system will be by the adjustment process furnace the opening degree of flue shutter 9, make furnace pressure reach its set(ting)value, promptly the opening degree of flue shutter 9 is only controlled by furnace pressure closed-loop control unit; When furnace pressure was in manual control mode, furnace pressure was controlled by the opening degree of regulating flue shutter 9 by the furnace operation worker.
Hence one can see that, no matter the process furnace furnace pressure is in automatically or manual control mode, the actual aperture degree detected value of furnace pressure control and adjustment and process furnace flue shutter 9 is irrelevant; In process furnace combustion control system, the actual aperture degree of flue shutter 9 detects the demonstration that only is used for the rough state of flashboard opening degree, so that the operative employee understands the operating mode of process furnace.
In the both sides of the turning direction of described flue shutter rocking bar 7, establish flue shutter rocking bar positive stop 8.
Near described output shaft rocking bar 4 plane of rotations, the flashboard position control is set detects element 5.
It is the nearly switch of a winding that described flashboard position control detects element 5.
In order to overcome above-mentioned two kinds of existing problems of flue shutter driving mechanism, the invention provides a kind of new billet heating furnace flue shutter transmission rig and control method, promptly adopt electric motor to drive flue shutter, and adopt one group of mechanical type impact switch or polarity formula inductive switch to detect the opening degree of flue shutter 9 through step-down gear.
In view of the above, the present invention is difficult for the nearly switch of a winding influenced by ambient temperature with process furnace flue shutter opening degree detecting unit by easy encoder influenced by ambient temperature instead.Ma Gangda H shaped steel billet heating furnace flue shutter electric driving mechanism sketch as shown in Figure 1.
Consider in the process that the process furnace operating mode monitors, less demanding to the display precision of flue shutter 9 actual aperture degree, we can say, as long as flue shutter 9 actual aperture degree detecting units can provide the approximate location of flue shutter 9.
For example: described flashboard position control detects element 5 and adopts 11 polarity formulas or mechanical detection switch, detect 11 opening degree positions of flue shutter 9, be respectively 0% opening degree, 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree and 100% opening degree; Described 0% opening degree is flue shutter 9 contract fully positions; Described 100% opening degree is flue shutter 9 full open positions.
Described 11 polarity formulas or mechanical detection switch are to be provided with on the correspondence position of the quadrant of speed reducer output shaft concentric discs.
In view of only need rotating quadrant, flue shutter 9 flashboard input shaft (flue shutter rotating shaft) when closing to opening operation gets final product; In addition, because the angle of rotation of the body of flue shutter 9 and the angle of rotation of transmission speed reducer output shaft 3 are synchronous, so, needed demonstration is counted (show as above-mentioned 11 opening degrees and count) according to flue shutter actual aperture degree, can on the correspondence position of the quadrant of speed reducer output shaft 3 concentric discs detector switch be set.
In order to realize the purpose identical with technique scheme, the present invention also provides the control method that is applied to above-described billet heating furnace flue shutter driving mechanism, now has 11 opening degrees with flue shutter 9 and shows that point is that example provides the memory flue shutter 9 actual methods of opening degrees roughly.
Its technical scheme is:
11 opening degree display fields of flue shutter 9 are set on the furnace operation station, corresponding 0% opening degree of difference, 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree and 100% opening degree, and be flue shutter 9 rough opening degrees, and 11 rough opening degree position display hurdles are associated with 11 numeric type work outpuies of Controlling System respectively, described 11 numeric type work outpuies are respectively: Q
Yz1, Q
Yz2, Q
Yz3, Q
Yz4, Q
Yz5, Q
Yz6, Q
Yz7, Q
Yz8, Q
Yz9, Q
Yz10And Q
Yz11
When the pairing digital quantity of one of them opening degree display field was output as ' 1 ' state, expression flue shutter 9 was in the pairing rough opening degree of this display field position.
The precision that the rough opening degree of flue shutter shows is relevant with the number that flue shutter actual aperture degree check point is provided with, and the many more precision of actual aperture degree check point are high more.
For the flue shutter 9 with 11 opening degree check points, the maximum deviation that the actual aperture degree of flue shutter 9 shows is not more than 18 °
Mechanical angle.The actual rough opening degree display control program block diagram of flue shutter 9 as shown in Figure 2.
Because detector switch is a discrete distribution, and the actual aperture degree of flue shutter 9 will change along with the change of furnace pressure set(ting)value and actual furnace situation, the actual aperture degree that is flue shutter 9 is not changeless, so, use detector switch to realize that the opening degree of flue shutter 9 shows the memory problems that just must solve flue shutter 9 actual rough opening degrees, the technical scheme of its solution is:
The actual rough opening degree display control program of this flue shutter is made up of 11 rest-set flip-flops and 11 OR-circuits respectively, 11 rough opening degrees at flue shutter show point, in sequence of control, realize showing memory to its opening degree point with a rest-set flip-flop and 1 OR-circuit respectively with the segmentation that realizes the flue shutter opening degree.
As shown in Figure 2,11 rest-set flip-flops of the actual rough opening degree display control program of this flue shutter be respectively YZKX01, YZKX03 ..., YZKX21; 11 OR-circuits be respectively YZKX02, YZKX04 ..., YZKX22.
For example, flue shutter 9 arrives 10% opening degree check point, the 10% opening degree detector switch that is flue shutter 9 sends " pick up " signal, the detector switch of flue shutter 9 other opening degree check points then sends " picking up mistake " signal, like this, the actual rough opening degree display control program of flue shutter 9 will provide flue shutter 9 and be in 10% rough opening degree position (i.e. the pairing rest-set flip-flop Q end of 10% opening degree demonstration point is put ' 1 '), in the moving process that flue shutter 9 is opening or closing, reach its left and right sides adjacent apertures degree check point, i.e. (i.e. the pairing rest-set flip-flop Q end of 10% opening degree demonstration point is put ' 0 ' again) till 0% opening degree or the 20% opening degree check point.
Then adopt a same quadrat method of remembering with 10% opening degree demonstration point to handle for the memory of other opening degree demonstration point of flue shutter, that is:
For 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree, adopt the asserts signal of the detector switch signal of flue shutter 9 place opening degree check points, and the detector switch signal of this opening degree left and right sides adjacent apertures degree check point is as the reset signal of the pairing triggering device Q end of this opening degree as the pairing triggering device Q end of this opening degree;
Show that for 0% opening degree point and 100% opening degree show point, adopt the asserts signal of the detector switch signal of opening degree check point separately as the pairing triggering device Q end of its opening degree.Because their adjacent apertures degree check point has only one, so, in sequence of control, both opening degrees show the only detector switch signal of a corresponding adjacent apertures degree check point that resets of the pairing rest-set flip-flop Q end of point, are respectively 10% opening degree detector switch signal and 90% opening degree detector switch signal.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (8)
1. billet heating furnace flue shutter driving mechanism, described driving mechanism is provided with motor (1), the rotating shaft of described flue shutter (9) overlaps and passes through the center of circle of flue shutter (9) with the plate body of flue shutter (9), it is characterized in that: described driving mechanism is established step-down gear (2), the output shaft of described motor (1) is connected with the input shaft of step-down gear (2), establishes on the speed reducer output shaft (3) on the described step-down gear (2) and its axis normal and the output shaft rocking bar (4) that is fastenedly connected; Establish in described flue shutter (9) rotating shaft and its axis normal and the flue shutter rocking bar (7) that is fastenedly connected; Described speed reducer output shaft (3) and flue shutter (9) shaft parallel, described flue shutter rocking bar (7) is articulated and connected by being connected fork (6) with output shaft rocking bar (4), constitutes parallel double crank mechanism.
2. according to the described billet heating furnace flue shutter of claim 1 driving mechanism, it is characterized in that:, establish flue shutter rocking bar positive stop (8) in the both sides of the turning direction of described flue shutter rocking bar (7).
3. according to the described billet heating furnace flue shutter of claim 1 driving mechanism, it is characterized in that: near described output shaft rocking bar (4) plane of rotation, the flashboard position control is set detects element (5).
4. according to the described billet heating furnace flue shutter of claim 3 driving mechanism, it is characterized in that: it is the nearly switch of a winding that described flashboard position control detects element (5).
5. according to the described billet heating furnace flue shutter of claim 3 driving mechanism, it is characterized in that: described flashboard position control detects element (5) and adopts 11 polarity formulas or mechanical detection switch, detect 11 opening degree positions of flue shutter (9), be respectively 0% opening degree, 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree and 100% opening degree; Described 0% opening degree is flue shutter (9) contract fully position; Described 100% opening degree is the full open position of flue shutter (9).
6. according to the described billet heating furnace flue shutter of claim 5 driving mechanism, it is characterized in that: described 11 polarity formulas or mechanical detection switch are to be provided with on the correspondence position of the quadrant of speed reducer output shaft concentric discs.
7. be applied to the control method of the described billet heating furnace flue shutter of claim 5 driving mechanism, it is characterized in that:
11 opening degree display fields of flue shutter (9) are set on the furnace operation station, respectively corresponding described 0% opening degree, 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree and 100% opening degree, and be the rough opening degree of flue shutter (9), and 11 rough opening degree position display hurdles are associated with 11 numeric type work outpuies of Controlling System respectively, described 11 numeric type work outpuies are respectively: Q
Yz1, Q
Yz2, Q
Yz3, Q
Yz4, Q
Yz5, Q
Yz6, Q
Yz7, Q
Yz8, Q
Yz9, Q
Yz10And Q
Yz11
When the pairing digital quantity of one of them opening degree display field was output as ' 1 ' state, expression flue shutter (9) was in the pairing rough opening degree of this display field position;
The actual rough opening degree display control program of this flue shutter is made up of 11 rest-set flip-flops and 11 OR-circuits respectively; Show points at the rough opening degrees of 11 of flue shutter, in sequence of control, realize memory with a rest-set flip-flop and 1 OR-circuit respectively, with the segmentation demonstration of realization flue shutter opening degree to its opening degree point.
8. according to the described control method of claim 7, it is characterized in that:
For described 10% opening degree, 20% opening degree, 30% opening degree, 40% opening degree, 50% opening degree, 60% opening degree, 70% opening degree, 80% opening degree, 90% opening degree, adopt the asserts signal of the detector switch signal of flue shutter (9) place opening degree check point, and the detector switch signal of this opening degree left and right sides adjacent apertures degree check point is as the reset signal of the pairing triggering device Q end of this opening degree as the pairing triggering device Q end of this opening degree;
Show that for 0% opening degree point and 100% opening degree show point, adopt the asserts signal of the detector switch signal of flue shutter (9) place opening degree check point as the pairing triggering device Q end of this opening degree; Because their adjacent apertures degree check point has only one, so, in sequence of control, both opening degrees show the only detector switch signal of a corresponding adjacent apertures degree check point that resets of the pairing rest-set flip-flop Q end of point, are respectively 10% opening degree detector switch signal and 90% opening degree detector switch signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110126621 CN102230068B (en) | 2011-05-17 | 2011-05-17 | Driving mechanism of billet heating furnace flue damper and control method thereof |
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|---|---|---|---|
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2234020Y (en) * | 1995-08-18 | 1996-08-28 | 北京华燕玻璃工业技术联合开发公司 | Rotary flashboard for controlling internal pressure of glass melting furnace |
| CN2252917Y (en) * | 1996-01-18 | 1997-04-23 | 马鞍山钢铁股份有限公司 | Precision regulating smoke duct valve |
-
2011
- 2011-05-17 CN CN 201110126621 patent/CN102230068B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2234020Y (en) * | 1995-08-18 | 1996-08-28 | 北京华燕玻璃工业技术联合开发公司 | Rotary flashboard for controlling internal pressure of glass melting furnace |
| CN2252917Y (en) * | 1996-01-18 | 1997-04-23 | 马鞍山钢铁股份有限公司 | Precision regulating smoke duct valve |
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