CN112029941B - Cold air valve closing valve control circuit and hot blast stove control system - Google Patents
Cold air valve closing valve control circuit and hot blast stove control system Download PDFInfo
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- CN112029941B CN112029941B CN202010810366.0A CN202010810366A CN112029941B CN 112029941 B CN112029941 B CN 112029941B CN 202010810366 A CN202010810366 A CN 202010810366A CN 112029941 B CN112029941 B CN 112029941B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
- C21B9/12—Hot-blast valves or slides for blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
Abstract
The invention relates to the technical field of automatic control, in particular to a cold air valve closing valve control circuit and a hot air furnace control system, which comprise a plurality of closing valve control branches which are connected in parallel and then are powered by a power supply; each valve closing control branch comprises a selection intermediate relay, an interlocking control sub-circuit and a valve closing output intermediate relay, and the valve closing output intermediate relay is used for controlling a closing coil of a hydraulic valve table electromagnetic directional valve of a cold air valve; a first control loop and a second control loop are formed in a valve closing control branch circuit by connecting a contact group of a selected intermediate relay in series with a valve closing output intermediate relay and connecting an interlocking control sub-circuit into the contact group of the selected intermediate relay; under the control of an air supply starting command, the second control loop is conducted, the first control loop is disconnected, and an interlocking control function corresponding to the interlocking control sub-circuit is started; under the control of the damping-down ending command, the first control loop is conducted, the second control loop is disconnected, and the interlocking control function corresponding to the interlocking control sub-circuit is closed.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a cold air valve closing valve control circuit and a hot air furnace control system.
Background
In the process of controlling a plurality of cold air valves of the hot air furnace, two control methods exist. The first control method is purely manual control without linkage, and the control method causes huge potential safety hazards to production and equipment safety. The second control method is interlock control in which the interlock input cannot be controlled, that is, the lock-up cannot be performed as long as the interlock control is input. However, although the second control method can solve the safety hazard, all the air cooling valves of the hot blast stove cannot be closed due to the input of the interlocking control.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a cold air valve closing valve control circuit and a hot blast stove control system that overcome or at least partially solve the above problems.
According to a first aspect of the invention, the invention provides a cold air valve closing valve control circuit, which comprises a power supply and a plurality of closing valve control branches, wherein the plurality of closing valve control branches are connected in parallel and then are powered by the power supply;
each valve closing control branch comprises a selection intermediate relay, an interlocking control sub-circuit and a valve closing output intermediate relay, and the valve closing output intermediate relay is used for controlling a closing coil of a hydraulic valve table electromagnetic directional valve of a cold air valve;
forming a first control loop and a second control loop in the closing valve control branch by connecting the contact group of the selective intermediate relay and the closing valve output intermediate relay in series and connecting the interlock control sub-circuit into the contact group of the selective intermediate relay; in the first control loop, part of the contacts of the selection intermediate relay are connected with the valve-closing output intermediate relay in series, and in the second control loop, part of the contacts of the selection intermediate relay, the interlock control sub-circuit and the valve-closing output intermediate relay are connected with each other in series;
under the control of an air supply starting command, the coil of the selection intermediate relay is electrified, so that the second control loop is controlled to be connected and the first control loop is controlled to be disconnected through the contact group of the selection intermediate relay, and an interlocking control function corresponding to the interlocking control sub-circuit is started; and under the control of a damping-down ending command, the coil of the selected intermediate relay loses power, the first control circuit is controlled to be connected and the second control circuit is controlled to be disconnected through the contact group of the selected intermediate relay, and the interlocking control function corresponding to the interlocking control sub-circuit is closed.
Preferably, each off valve control branch further comprises a mode conversion switch, a remote off valve control contact and a local off valve control contact;
the remote closing valve control contact and the local closing valve control contact are connected in parallel and then are connected in series with the mode conversion switch to form a mode conversion circuit structure;
the mode switching circuit structure is connected in series in the valve closing control branch.
Preferably, the selective intermediate relay comprises a first movable contact, a second movable contact, a first fixed contact and a second fixed contact corresponding to the first movable contact, and a third fixed contact and a fourth fixed contact corresponding to the second movable contact;
one end of the first stationary contact and one end of the third stationary contact are short-sealed, and the interlocking control sub-circuit is connected between one end of the second stationary contact and one end of the fourth stationary contact in series;
under the condition that the coil of the selective intermediate relay is electrified, the movable end of the first movable contact is connected with the other end of the second fixed contact, and the movable end of the second movable contact is connected with the other end of the fourth fixed contact;
and under the condition that the coil of the selection intermediate relay is powered off, the movable end of the first movable contact is connected with the other end of the first fixed contact, and the movable end of the second movable contact is connected with the other end of the third fixed contact.
Preferably, each off-valve control branch further comprises a selection control contact, and the selection control contact is connected with the coil of the selection intermediate relay in series and then is connected to the power supply;
wherein the coil of the select intermediate relay is energized when the select control contact is energized, and the coil of the select intermediate relay is de-energized when the select control contact is de-energized.
Preferably, the interlock control sub-circuit comprises contacts of a plurality of target interlock relays connected in parallel, and the target interlock relays are interlock relays used for controlling other cold air valves except the cold air valve corresponding to the interlock control sub-circuit.
Preferably, each of the switching valve control branches further comprises a cold air valve opening-to-position signal contact;
the cold air valve in-place signal contact is connected with a coil of the interlocking relay in series and then is connected to the power supply;
and under the condition that the cold air valve is opened to the proper position and the signal contact is electrified, the coil of the interlocking relay is electrified, and under the condition that the cold air valve is opened to the proper position and the signal contact is not electrified, the coil of the interlocking relay is not electrified.
Preferably, when a first cold air valve, a second cold air valve, a third cold air valve and a fourth cold air valve exist, the cold air valve closing valve control circuit comprises a first closing valve control branch corresponding to the first cold air valve, a second closing valve control branch corresponding to the second cold air valve, a third closing valve control branch corresponding to the third cold air valve and a fourth closing valve control branch corresponding to the fourth cold air valve;
the first valve closing control branch comprises a first mode change-over switch, a first remote valve closing control contact, a first local valve closing control contact, a first selection intermediate relay, a first linkage control sub-circuit and a first valve closing output intermediate relay; the first remote closing valve control contact and the first local closing valve control contact are connected in parallel and then are connected in series with the first mode conversion switch to form a first mode conversion circuit structure; one end of the first mode switching circuit structure is connected with the power supply, the other end of the first mode switching circuit structure is connected with one end of the first closing valve output intermediate relay in series through a contact group of the first selection intermediate relay, the first linkage control sub-circuit is connected into the contact group of the first selection intermediate relay, and the other end of the first closing valve output intermediate relay is connected with the power supply; the first interlock control sub-circuit comprises a second interlock relay corresponding to the second cold air valve, a third interlock relay corresponding to the third cold air valve and a fourth interlock relay corresponding to the fourth cold air valve, and three interlock relays in the first interlock control sub-circuit are connected in parallel;
the second closing valve control branch comprises a second mode change-over switch, a second remote closing valve control contact, a second local closing valve control contact, a second selection intermediate relay, a second interlock control sub-circuit and a second closing valve output intermediate relay; the second remote closing valve control contact and the second local closing valve control contact are connected in parallel and then are connected in series with the second mode conversion switch to form a second mode conversion circuit structure; one end of the second mode conversion circuit structure is connected with the power supply, the other end of the second mode conversion circuit structure is connected with one end of the second closing valve output intermediate relay in series through a contact group of the second selection intermediate relay, the second interlocking control sub-circuit is connected into the contact group of the second selection intermediate relay, and the other end of the second closing valve output intermediate relay is connected with the power supply; the second interlocking control sub-circuit comprises a first interlocking relay corresponding to the first cold air valve, a third interlocking relay corresponding to the third cold air valve and a fourth interlocking relay corresponding to the fourth cold air valve, and three interlocking relays in the second interlocking control sub-circuit are connected in parallel;
the third closing valve control branch comprises a third mode change-over switch, a third remote closing valve control contact, a third local closing valve control contact, a third selection intermediate relay, a third linkage control sub-circuit and a third closing valve output intermediate relay; the third remote closing valve control contact and the third local closing valve control contact are connected in parallel and then are connected in series with the third mode conversion switch to form a third mode conversion circuit structure; one end of the third mode conversion circuit structure is connected with the power supply, the other end of the third mode conversion circuit structure is connected with one end of the third closing valve output intermediate relay in series through a contact group of the third selection intermediate relay, the third interlocking control sub-circuit is connected into the contact group of the third selection intermediate relay, and the other end of the third closing valve output intermediate relay is connected with the power supply; the third interlocking control sub-circuit comprises a first interlocking relay corresponding to the first cold air valve, a second interlocking relay corresponding to the second cold air valve and a fourth interlocking relay corresponding to the fourth cold air valve, and three interlocking relays in the third interlocking control sub-circuit are connected in parallel;
the fourth closing valve control branch comprises a fourth mode change-over switch, a fourth remote closing valve control contact, a fourth local closing valve control contact, a fourth selection intermediate relay, a fourth linkage control sub-circuit and a fourth closing valve output intermediate relay; the fourth remote closing valve control contact and the fourth local closing valve control contact are connected in parallel and then are connected in series with the fourth mode conversion switch to form a fourth mode conversion circuit structure; one end of the fourth mode conversion circuit structure is connected with the power supply, the other end of the fourth mode conversion circuit structure is connected with one end of the fourth closing valve output intermediate relay in series through a contact group of the fourth selection intermediate relay, the fourth interlocking control sub-circuit is connected into the contact group of the fourth selection intermediate relay, and the other end of the fourth closing valve output intermediate relay is connected with the power supply; the fourth interlocking control sub-circuit comprises a first interlocking relay corresponding to the first cold air valve, a second interlocking relay corresponding to the second cold air valve and a third interlocking relay corresponding to the third cold air valve, and three interlocking relays in the fourth interlocking control sub-circuit are connected in parallel.
According to a second aspect of the present invention, there is provided a control system for a hot blast stove, comprising a plurality of cold blast valves and a cold blast valve closing valve control circuit as described in the first aspect.
The cold air valve closing valve control circuit comprises a power supply and a plurality of closing valve control branches, wherein the plurality of closing valve control branches are connected in parallel and then are powered by the power supply. Each valve closing control branch comprises a selection intermediate relay, an interlocking control sub-circuit and a valve closing output intermediate relay, and the valve closing output intermediate relay is used for being connected with a cold air valve. A first control loop and a second control loop are formed in a valve closing control branch circuit by connecting a contact group of a selected intermediate relay in series with a valve closing output intermediate relay and connecting an interlocking control sub-circuit into the contact group of the selected intermediate relay; in the first control circuit, part of the contacts of the selection intermediate relay is connected in series with the close valve output intermediate relay, and in the second control circuit, part of the contacts of the selection intermediate relay, the interlock control sub-circuit and the close valve output intermediate relay are connected in series. Under the control of an air supply starting command, a coil of the intermediate relay is selected to be electrified, so that the contact group of the intermediate relay is selected to control the second control circuit to be conducted and the first control circuit to be disconnected, and an interlocking control function corresponding to the interlocking control sub-circuit is started; and under the control of a damping-down ending command, the coil of the intermediate relay is selected to lose power, the contact group of the intermediate relay is selected to control the first control loop to be switched on and the second control loop to be switched off, and the interlocking control function corresponding to the interlocking control sub-circuit is switched off. According to the invention, through the circuit structure, the switching of the interlocking control function between opening and closing is realized by switching the first control loop and the second control loop, so that not only can the interlocking of a plurality of cold air valves be realized, but also all the cold air valves can be closed simultaneously.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a circuit diagram of the relationship between a plurality of off valve control branches in an embodiment of the present invention.
Fig. 2 is a circuit diagram showing the relationship among the select intermediate relay, the interlock control sub-circuit, and the off-valve output intermediate relay in the embodiment of the present invention.
Fig. 3 is a circuit diagram showing the relationship between the selection control contact and the selection of the coil of the intermediate relay in the embodiment of the present invention.
Fig. 4 shows a circuit diagram of an interlock control sub-circuit in the embodiment of the present invention.
Fig. 5 is a circuit diagram showing the relationship between the cold air valve open to the position signal contact and the coil of the interlock relay in the embodiment of the present invention.
Fig. 6 is a circuit diagram showing the relationship between the mode changeover switch, the remote off valve control contact and the local off valve control contact in an embodiment of the present invention.
Fig. 7 shows a circuit diagram of a cold air valve closing circuit when a first cold air valve, a second cold air valve, a third cold air valve and a fourth cold air valve are present in an embodiment of the invention.
Fig. 8 shows a circuit diagram of the first interlock control sub-circuit in the embodiment of the present invention.
Fig. 9 shows a circuit diagram of a second interlock control sub-circuit in the embodiment of the present invention.
Fig. 10 shows a circuit diagram of a third interlock control sub-circuit in the embodiment of the present invention.
Fig. 11 shows a circuit diagram of a fourth interlock control sub-circuit in the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The first embodiment of the invention provides a cold air valve closing valve control circuit, which is used for closing a cold air valve of a hot air furnace, and is suitable for closing a plurality of cold air valves. The circuit is explained in detail below.
As shown in fig. 1, the cold air valve closing valve control circuit according to the embodiment of the present invention includes a power supply and a plurality of closing valve control branches, and the plurality of closing valve control branches are connected in parallel and then powered by the power supply. The power supply is direct current, and specifically, 24V direct current can be selected. The quantity of the valve-closing control branches is determined by the quantity of the cold air valves, and the cold air valves are the same. For example, if there are four cold air valves to be controlled, the cold air valve closing valve control circuit includes four closing valve control branches, and the four closing valve control branches are connected in parallel.
Further, the operating principle of each off valve control branch is the same, and the circuit structure of one off valve control branch is taken as an example and described in detail below.
As shown in fig. 2, the Close valve control branch includes a Select intermediate relay (i.e., K _ Select), an interlock control sub-circuit, and a Close valve output intermediate relay (i.e., Q _ Close). And the valve closing output intermediate relay is used for controlling a closing coil of a hydraulic valve table electromagnetic reversing valve of the cold air valve. And after the valve closing output intermediate relay is electrified, the corresponding cold air valve is closed.
In an embodiment of the present invention, a first control loop and a second control loop are formed in the closed valve control branch by connecting the contact set (i.e., C) of the select intermediate relay in series with the closed valve output intermediate relay, and connecting the interlock control sub-circuit into the contact set of the select intermediate relay. In the first control loop, part of the contacts of the selection intermediate relay is connected in series with the valve-closing output intermediate relay. In the second control loop, part of the contacts of the selective intermediate relay, the interlock control sub-circuit and the valve closing output intermediate relay are connected in series.
The structure of the selective intermediate relay will be described in detail below.
As shown in fig. 2, the selective intermediate relay includes a first movable contact (i.e., contact 9), a second movable contact (i.e., contact 10), a first fixed contact (i.e., contact 1) and a second fixed contact (i.e., contact 5) corresponding to the first movable contact, a third fixed contact (i.e., contact 2) and a fourth fixed contact (i.e., contact 6) corresponding to the second movable contact. One end of the first stationary contact and one end of the third stationary contact are short-sealed (i.e. contact 1 and contact 2 are short-sealed), and a series interlock control sub-circuit (i.e. a series interlock control sub-circuit between contact 5 and contact 6) is arranged between one end of the second stationary contact and one end of the fourth stationary contact. Thus, the first control loop includes contact 9, contact 1, contact 2, and contact 10, and the second control loop includes contact 9, contact 5, contact 6, and contact 10.
Further, when an air supply starting command exists, the requirement for opening the interlocking control function of the cold air valve is indicated. Therefore, under the control of the air supply starting command, the coil of the selected intermediate relay is electrified, the contact group of the selected intermediate relay controls the second control circuit to be conducted and the first control circuit to be disconnected, and the interlocking control function corresponding to the interlocking control sub-circuit is started.
When the command of ending the damping-down exists, the requirement of closing the interlocking control function of the cold air valve is indicated. Therefore, under the control of the command of ending the damping down, the coil of the selected intermediate relay loses power, and the contact group of the selected intermediate relay controls the first control circuit to be conducted and the second control circuit to be disconnected, so that the interlocking control function corresponding to the interlocking control sub-circuit is closed.
Specifically, in the case where the coil of the intermediate relay is selected to be energized, the moving end of the first moving contact is connected to the other end of the second stationary contact (i.e., contact 5), and the moving end of the second moving contact is connected to the other end of the fourth stationary contact (i.e., contact 6). Thus, the second control loop is conducted, the first control loop is disconnected, and the interlock control sub-circuit is connected into the circuit. In the case of the coil of the selected intermediate relay losing power, the moving end of the first moving contact is connected with the other end of the first fixed contact (i.e. contact 1), and the moving end of the second moving contact is connected with the other end of the third fixed contact (i.e. contact 2). Therefore, the first control loop is conducted, the second control loop is disconnected, and the interlocking control sub-circuit is not connected into the circuit.
It should be noted that, the interlocking control function means that a plurality of cold air valves are interlocked to ensure that at least one cold air valve is in an open state. Under the condition that the interlocking control function is started, at least one cold air valve is in an open state in all cold air valves. Under the condition that the interlocking control function is closed, all cold air valves can be closed, namely all cold air valves can be closed.
According to the invention, through the circuit structure, the switching of the interlocking control function between opening and closing is realized by switching the first control loop and the second control loop, so that not only can the interlocking of a plurality of cold air valves be realized, but also all the cold air valves can be closed simultaneously.
In order to control the power-on and power-off condition of the contact of the selected intermediate relay, in the embodiment of the invention, each off-valve control branch further comprises a selected control contact (DCS _ Select). As shown in fig. 3, the selection control contact is connected in series with the coil of the selection intermediate relay and then connected to the power supply. Wherein, when the selection control contact is electrified, the coil of the intermediate relay is electrified, and when the selection control contact is electrified, the coil of the intermediate relay is electrified. The contact of the intermediate relay is controlled to be powered on or powered off by selecting the power on or power off of the coil of the intermediate relay. Further, under the control of an air supply starting command, a control contact is selected to be closed, and then a coil of the intermediate relay is selected to be electrified; and under the control of a damping-down ending command, selecting the control contact to be disconnected, and further selecting the coil of the intermediate relay to lose power.
As shown in fig. 4, the interlock control sub-circuit includes contacts of a plurality of target interlock relays connected in parallel, and the target interlock relays are interlock relays (i.e., K) for controlling other cold air valves except for the cold air valve corresponding to the interlock control sub-circuit itself. For example, if the currently targeted interlock control sub-circuit is a first interlock control sub-circuit, the first interlock control sub-circuit corresponds to the first cold air valve, the cold air valve closing valve control circuit further includes a second interlock control sub-circuit and a third interlock control sub-circuit, the second interlock control sub-circuit corresponds to the second cold air valve, and the third interlock control sub-circuit corresponds to the third cold air valve, then, the first interlock control sub-circuit includes a contact of the second interlock relay corresponding to the second cold air valve and a contact of the third interlock relay corresponding to the third cold air valve, and the two contacts are connected in parallel.
In order to control the power-on and power-off condition of the contacts of the interlock relay, in the embodiment of the invention, each switching valve control branch further comprises a cold air valve opening-to-position signal contact (i.e. Open _ Lmite). As shown in fig. 5, the cold air valve is opened to the right, and the signal contact is connected in series with the coil of the interlock relay and then connected to the power supply. The coil of the interlocking relay is electrified under the condition that the cold air valve is in place and the signal contact is electrified, and the coil of the interlocking relay is electrified under the condition that the cold air valve is in place and the signal contact is not electrified. The power on or power off of the coil of the interlocking relay is controlled, so that the power on or power off of the contact of the interlocking relay is controlled. For the cold air valve in-place signal contact, after the cold air valve is in place, the corresponding cold air valve in-place signal contact is triggered to be closed, and then the coil of the corresponding interlocking relay is electrified.
Further, the system is used for realizing multiple local and remote control modes and free switching under different control modes. In an embodiment of the present invention, as shown in fig. 6, each off valve control branch further includes a mode conversion switch (i.e., S), a remote off valve control contact (i.e., DCS _ Close), and a Local off valve control contact (i.e., Local _ Close). The remote closing valve control contact and the local closing valve control contact are connected in parallel and then connected in series with the mode conversion switch to form a mode conversion circuit structure, and the mode conversion circuit structure is connected in series in the closing valve control branch.
Specifically, the mode changeover switch includes a remote switch and a local switch interlocked with each other, the local switch being open when the remote switch is closed, and the remote switch being open when the local switch is closed. The remote switch is connected in series with the remote switch valve control contact to form a first series circuit structure, the local switch is connected in series with the local switch valve control contact to form a second series circuit structure, and the first series circuit structure and the second series circuit structure are connected in parallel. After the remote switch is closed, the closing valve control branch can be conducted by controlling the remote closing valve control contact to be electrified, and similarly, after the local switch is closed, the closing valve control branch can be conducted by controlling the local closing valve control contact to be electrified.
The cold air valve closing valve control circuit will be described in detail below by taking the example of the presence of four cold air valves.
When there are first cold-blast valve, second cold-blast valve, third cold-blast valve and fourth cold-blast valve, cold-blast valve closes valve control circuit and includes the first valve control branch road that closes that corresponds with first cold-blast valve, the second valve control branch road that corresponds with the second cold-blast valve, the third valve control branch road that corresponds with the third cold-blast valve and the fourth valve control branch road that corresponds with the fourth cold-blast valve.
The first off valve control branch includes a first mode conversion switch S1, a first remote off valve control contact DCS _ Close1, a first Local off valve control contact Local _ Close1, a first Select intermediate relay K _ Select1, a first interlock control sub-circuit, and a first off valve output intermediate relay Q _ Close 1. The first remote closing valve control contact DCS _ Close1 and the first Local closing valve control contact Local _ Close1 are connected in parallel and then connected in series with the first mode conversion switch S1 to form a first mode conversion circuit structure, one end of the first mode conversion circuit structure is connected with a power supply, the other end of the first mode conversion circuit structure is connected in series with one end of the first closing valve output intermediate relay Q _ Close1 through a contact group of the first selection intermediate relay K _ Select1, the first locking control sub-circuit is connected into the contact group of the first selection intermediate relay K _ Select1, and the other end of the first closing valve output intermediate relay Q _ Close1 is connected with the power supply. As shown in fig. 8, the first interlock control sub-circuit includes a second interlock relay K2 corresponding to the second cold air valve, a third interlock relay K3 corresponding to the third cold air valve, and a fourth interlock relay K4 corresponding to the fourth cold air valve, and three interlock relays in the first interlock control sub-circuit are connected in parallel.
The second Close valve control branch includes a second mode conversion switch S2, a second remote Close valve control contact DCS _ Close2, a second Local Close valve control contact Local _ Close2, a second Select intermediate relay K _ Select2, a second interlock control sub-circuit, and a second Close valve output intermediate relay Q _ Close 2. The second remote closing valve control contact DCS _ Close2 and the second Local closing valve control contact Local _ Close2 are connected in parallel and then connected in series with the second mode conversion switch S2 to form a second mode conversion circuit structure, one end of the second mode conversion circuit structure is connected with a power supply, the other end of the second mode conversion circuit structure is connected in series with one end of the second closing valve output intermediate relay Q _ Close2 through a contact group of the second selection intermediate relay K _ Select2, the second interlocking control sub-circuit is connected into the contact group of the second selection intermediate relay K _ Select2, and the other end of the second closing valve output intermediate relay Q _ Close2 is connected with the power supply. As shown in fig. 9, the second interlock control sub-circuit includes a first interlock relay K1 corresponding to the first cold air valve, a third interlock relay K3 corresponding to the third cold air valve, and a fourth interlock relay K4 corresponding to the fourth cold air valve, and three interlock relays in the second interlock control sub-circuit are connected in parallel.
The third off valve control branch includes a third mode conversion switch S3, a third remote off valve control contact DCS _ Close3, a third Local off valve control contact Local _ Close3, a third Select intermediate relay K _ Select3, a third interlock control sub-circuit, and a third off valve output intermediate relay Q _ Close 3. The third remote closing valve control contact DCS _ Close3 and the third Local closing valve control contact Local _ Close3 are connected in parallel and then connected in series with the third mode conversion switch S3 to form a third mode conversion circuit structure, one end of the third mode conversion circuit structure is connected with a power supply, the other end of the third mode conversion circuit structure is connected in series with one end of the third closing valve output intermediate relay Q _ Close3 through a contact group of the third selection intermediate relay K _ Select3, the third interlocking control sub-circuit is connected into the contact group of the third selection intermediate relay K _ Select3, and the other end of the third closing valve output intermediate relay Q _ Close3 is connected with the power supply. As shown in fig. 10, the third interlock control sub-circuit includes a first interlock relay K1 corresponding to the first cold air valve, a second interlock relay K2 corresponding to the second cold air valve, and a fourth interlock relay K4 corresponding to the fourth cold air valve, and three interlock relays in the third interlock control sub-circuit are connected in parallel.
The fourth Close valve control branch includes a fourth mode conversion switch S4, a fourth remote Close valve control contact DCS _ Close4, a fourth Local Close valve control contact Local _ Close4, a fourth Select intermediate relay K _ Select4, a fourth interlock control sub-circuit, and a fourth Close valve output intermediate relay Q _ Close 4. The fourth remote closing valve control contact DCS _ Close4 and the fourth Local closing valve control contact Local _ Close4 are connected in parallel and then connected in series with the fourth mode conversion switch S4 to form a fourth mode conversion circuit structure, one end of the fourth mode conversion circuit structure is connected with a power supply, the other end of the fourth mode conversion circuit structure is connected in series with one end of the fourth closing valve output intermediate relay Q _ Close4 through a contact group of the fourth selection intermediate relay K _ Select4, the fourth interlocking control sub-circuit is connected into the contact group of the fourth selection intermediate relay K _ Select4, and the other end of the fourth closing valve output intermediate relay Q _ Close4 is connected with the power supply. As shown in fig. 11, the fourth interlock control sub-circuit includes a first interlock relay K1 corresponding to the first cold air valve, a second interlock relay K2 corresponding to the second cold air valve, and a third interlock relay K3 corresponding to the third cold air valve, and three interlock relays in the fourth interlock control sub-circuit are connected in parallel.
The working principle is explained below by taking the first valve-closing control branch as an example, and the rest valve-closing control branches can be realized by referring to the flow, which is not described in detail in the embodiments of the present invention.
For the interlock control sub-circuit, any interlock relay is triggered, the coil of the interlock relay is electrified, the rest three cold air valve closing valve control loops are switched on, but the cold air valve closing valve control loop corresponding to the interlock relay is not switched on. Under the interlocking condition, at most, three cold air valves can be closed continuously, and at least one cold air valve is kept to be not closed.
And the blowing start command controls the DCS _ select1 contact to be closed, the K _ select1 coil is electrified, the contact 9 in the K _ select1 is communicated with the contact 5, the contact 10 is communicated with the contact 6, and the interlocking control function is put into operation. And the on-off condition in the first interlock control sub-circuit depends on the state of Open _ Limit 1-4.
When the first cold air valve is opened to a proper position, the Open _ Limit1 is switched on, the coil of the K1 is electrified, all contacts of the K1 are attracted, namely all contacts of the K1 in the images 8-11 are attracted, at the moment, the K _ Select2-5 and the K _ Select2-6 are conducted, the K _ Select3-5 and the K _ Select3-6 are conducted, and the K _ Select4-5 and the K _ Select4-6 are conducted. Therefore, at this time, the second cold air valve, the third cold air valve and the fourth cold air valve only need to give out corresponding valve closing commands (namely DCS _ Close1 or Local _ Close1) in the corresponding control mode (corresponding to remote or Local) selected by S1, and the valve closing process of the corresponding valves can be realized. The working process of other cold air valves can be realized by referring to the process, and the embodiment of the invention is not described again.
In addition to the automatic control method using the air blow start command and the stop command, the relay contact may be controlled to be electrically disconnected manually.
Based on the same inventive concept, a second embodiment of the present invention further provides a hot blast stove control system, which includes a plurality of cold blast valves and the cold blast valve closing valve control circuit described in the first embodiment. Since the first embodiment has been described in detail with respect to the cold air valve-closing valve control circuit, no further description is given here.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A cold air valve closing valve control circuit is characterized by comprising a power supply and a plurality of closing valve control branches, wherein the plurality of closing valve control branches are connected in parallel and then powered by the power supply;
each valve closing control branch comprises a selection intermediate relay, an interlocking control sub-circuit and a valve closing output intermediate relay, and the valve closing output intermediate relay is used for controlling a closing coil of a hydraulic valve table electromagnetic directional valve of a cold air valve; each closing valve control branch also comprises a mode conversion switch, a remote closing valve control contact and a local closing valve control contact; the remote closing valve control contact and the local closing valve control contact are connected in parallel and then are connected in series with the mode conversion switch to form a mode conversion circuit structure; the mode conversion circuit structure is connected in series in the valve closing control branch;
forming a first control loop and a second control loop in the closing valve control branch by connecting the contact group of the selective intermediate relay and the closing valve output intermediate relay in series and connecting the interlock control sub-circuit into the contact group of the selective intermediate relay; in the first control loop, part of the contacts of the selection intermediate relay are connected with the valve-closing output intermediate relay in series, and in the second control loop, part of the contacts of the selection intermediate relay, the interlock control sub-circuit and the valve-closing output intermediate relay are connected with each other in series;
under the control of an air supply starting command, the coil of the selection intermediate relay is electrified, so that the second control loop is controlled to be connected and the first control loop is controlled to be disconnected through the contact group of the selection intermediate relay, and an interlocking control function corresponding to the interlocking control sub-circuit is started; and under the control of a damping-down ending command, the coil of the selected intermediate relay loses power, the first control circuit is controlled to be connected and the second control circuit is controlled to be disconnected through the contact group of the selected intermediate relay, and the interlocking control function corresponding to the interlocking control sub-circuit is closed.
2. The cold air valve closing valve control circuit according to claim 1, wherein said selective intermediate relay comprises a first movable contact, a second movable contact, a first stationary contact and a second stationary contact corresponding to said first movable contact, a third stationary contact and a fourth stationary contact corresponding to said second movable contact;
one end of the first stationary contact and one end of the third stationary contact are short-sealed, and the interlocking control sub-circuit is connected between one end of the second stationary contact and one end of the fourth stationary contact in series;
under the condition that the coil of the selective intermediate relay is electrified, the movable end of the first movable contact is connected with the other end of the second fixed contact, and the movable end of the second movable contact is connected with the other end of the fourth fixed contact;
and under the condition that the coil of the selection intermediate relay is powered off, the movable end of the first movable contact is connected with the other end of the first fixed contact, and the movable end of the second movable contact is connected with the other end of the third fixed contact.
3. The cooling valve closing valve control circuit according to claim 1, wherein each closing valve control branch further comprises a selection control contact, and the selection control contact is connected with a coil of the selection intermediate relay in series and then is connected to the power supply;
wherein the coil of the select intermediate relay is energized when the select control contact is energized, and the coil of the select intermediate relay is de-energized when the select control contact is de-energized.
4. The cold air valve closing valve control circuit according to claim 1, wherein the interlock control sub-circuit comprises contacts of a plurality of target interlock relays connected in parallel, and the target interlock relays are interlock relays for controlling other cold air valves except the cold air valve corresponding to the interlock control sub-circuit itself.
5. The cooling valve closing valve control circuit according to claim 4, wherein each closing valve control branch further comprises a cooling valve opening-to-position signal contact;
the cold air valve in-place signal contact is connected with a coil of the interlocking relay in series and then is connected to the power supply;
and under the condition that the cold air valve is opened to the proper position and the signal contact is electrified, the coil of the interlocking relay is electrified, and under the condition that the cold air valve is opened to the proper position and the signal contact is not electrified, the coil of the interlocking relay is not electrified.
6. The cooling air valve closing valve control circuit according to claim 1, wherein when there is a first cooling air valve, a second cooling air valve, a third cooling air valve and a fourth cooling air valve, the cooling air valve closing valve control circuit comprises a first closing valve control branch corresponding to the first cooling air valve, a second closing valve control branch corresponding to the second cooling air valve, a third closing valve control branch corresponding to the third cooling air valve and a fourth closing valve control branch corresponding to the fourth cooling air valve;
the first valve closing control branch comprises a first mode change-over switch, a first remote valve closing control contact, a first local valve closing control contact, a first selection intermediate relay, a first linkage control sub-circuit and a first valve closing output intermediate relay; the first remote closing valve control contact and the first local closing valve control contact are connected in parallel and then are connected in series with the first mode conversion switch to form a first mode conversion circuit structure; one end of the first mode switching circuit structure is connected with the power supply, the other end of the first mode switching circuit structure is connected with one end of the first closing valve output intermediate relay in series through a contact group of the first selection intermediate relay, the first linkage control sub-circuit is connected into the contact group of the first selection intermediate relay, and the other end of the first closing valve output intermediate relay is connected with the power supply; the first interlock control sub-circuit comprises a second interlock relay corresponding to the second cold air valve, a third interlock relay corresponding to the third cold air valve and a fourth interlock relay corresponding to the fourth cold air valve, and three interlock relays in the first interlock control sub-circuit are connected in parallel;
the second closing valve control branch comprises a second mode change-over switch, a second remote closing valve control contact, a second local closing valve control contact, a second selection intermediate relay, a second interlock control sub-circuit and a second closing valve output intermediate relay; the second remote closing valve control contact and the second local closing valve control contact are connected in parallel and then are connected in series with the second mode conversion switch to form a second mode conversion circuit structure; one end of the second mode conversion circuit structure is connected with the power supply, the other end of the second mode conversion circuit structure is connected with one end of the second closing valve output intermediate relay in series through a contact group of the second selection intermediate relay, the second interlocking control sub-circuit is connected into the contact group of the second selection intermediate relay, and the other end of the second closing valve output intermediate relay is connected with the power supply; the second interlocking control sub-circuit comprises a first interlocking relay corresponding to the first cold air valve, a third interlocking relay corresponding to the third cold air valve and a fourth interlocking relay corresponding to the fourth cold air valve, and three interlocking relays in the second interlocking control sub-circuit are connected in parallel;
the third closing valve control branch comprises a third mode change-over switch, a third remote closing valve control contact, a third local closing valve control contact, a third selection intermediate relay, a third linkage control sub-circuit and a third closing valve output intermediate relay; the third remote closing valve control contact and the third local closing valve control contact are connected in parallel and then are connected in series with the third mode conversion switch to form a third mode conversion circuit structure; one end of the third mode conversion circuit structure is connected with the power supply, the other end of the third mode conversion circuit structure is connected with one end of the third closing valve output intermediate relay in series through a contact group of the third selection intermediate relay, the third interlocking control sub-circuit is connected into the contact group of the third selection intermediate relay, and the other end of the third closing valve output intermediate relay is connected with the power supply; the third interlocking control sub-circuit comprises a first interlocking relay corresponding to the first cold air valve, a second interlocking relay corresponding to the second cold air valve and a fourth interlocking relay corresponding to the fourth cold air valve, and three interlocking relays in the third interlocking control sub-circuit are connected in parallel;
the fourth closing valve control branch comprises a fourth mode change-over switch, a fourth remote closing valve control contact, a fourth local closing valve control contact, a fourth selection intermediate relay, a fourth linkage control sub-circuit and a fourth closing valve output intermediate relay; the fourth remote closing valve control contact and the fourth local closing valve control contact are connected in parallel and then are connected in series with the fourth mode conversion switch to form a fourth mode conversion circuit structure; one end of the fourth mode conversion circuit structure is connected with the power supply, the other end of the fourth mode conversion circuit structure is connected with one end of the fourth closing valve output intermediate relay in series through a contact group of the fourth selection intermediate relay, the fourth interlocking control sub-circuit is connected into the contact group of the fourth selection intermediate relay, and the other end of the fourth closing valve output intermediate relay is connected with the power supply; the fourth interlocking control sub-circuit comprises a first interlocking relay corresponding to the first cold air valve, a second interlocking relay corresponding to the second cold air valve and a third interlocking relay corresponding to the third cold air valve, and three interlocking relays in the fourth interlocking control sub-circuit are connected in parallel.
7. A hot blast stove control system, characterized by comprising a plurality of cold blast valves and a cold blast valve closing valve control circuit according to any one of claims 1 to 6.
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| CN202010810366.0A CN112029941B (en) | 2020-08-13 | 2020-08-13 | Cold air valve closing valve control circuit and hot blast stove control system |
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| CN202010810366.0A CN112029941B (en) | 2020-08-13 | 2020-08-13 | Cold air valve closing valve control circuit and hot blast stove control system |
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| CN112029941B true CN112029941B (en) | 2021-12-10 |
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| GB1139747A (en) * | 1966-01-05 | 1969-01-15 | Kinney Eng Inc S P | Automatic stove selection system for blast furnaces |
| CN102816884A (en) * | 2012-08-10 | 2012-12-12 | 北京首钢自动化信息技术有限公司 | Hot-blast stove cold air stop-valve close valve interlocking and unlocking methods |
| CN104694684A (en) * | 2015-02-28 | 2015-06-10 | 北京首钢自动化信息技术有限公司 | Blast furnace oxygen-rich rapid cut-off valve control system and method |
| CN109375566A (en) * | 2018-10-18 | 2019-02-22 | 鞍钢集团工程技术有限公司 | A kind of control method of hot-blast stove equalizer valve and purge valve |
| CN209672543U (en) * | 2018-12-19 | 2019-11-22 | 中国汽车工业工程有限公司 | A kind of air-valve and blower chain control module |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1139747A (en) * | 1966-01-05 | 1969-01-15 | Kinney Eng Inc S P | Automatic stove selection system for blast furnaces |
| CN102816884A (en) * | 2012-08-10 | 2012-12-12 | 北京首钢自动化信息技术有限公司 | Hot-blast stove cold air stop-valve close valve interlocking and unlocking methods |
| CN104694684A (en) * | 2015-02-28 | 2015-06-10 | 北京首钢自动化信息技术有限公司 | Blast furnace oxygen-rich rapid cut-off valve control system and method |
| CN109375566A (en) * | 2018-10-18 | 2019-02-22 | 鞍钢集团工程技术有限公司 | A kind of control method of hot-blast stove equalizer valve and purge valve |
| CN209672543U (en) * | 2018-12-19 | 2019-11-22 | 中国汽车工业工程有限公司 | A kind of air-valve and blower chain control module |
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