CN111123821A - Cable drum control device of vacuum refining RH molten steel car - Google Patents
Cable drum control device of vacuum refining RH molten steel car Download PDFInfo
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- CN111123821A CN111123821A CN201911279061.5A CN201911279061A CN111123821A CN 111123821 A CN111123821 A CN 111123821A CN 201911279061 A CN201911279061 A CN 201911279061A CN 111123821 A CN111123821 A CN 111123821A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 238000007670 refining Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 abstract description 18
- 230000007423 decrease Effects 0.000 abstract 1
- 101100190618 Arabidopsis thaliana PLC3 gene Proteins 0.000 description 29
- 101100520231 Caenorhabditis elegans plc-3 gene Proteins 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1179—Safety, on error, fault, block, inhibit output
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Physics & Mathematics (AREA)
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- Automation & Control Theory (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a cable drum control device of a vacuum refining RH molten steel car, which comprises a jacking lower limit sensor and a jacking upper limit sensor which are respectively connected with a Programmable Logic Controller (PLC), wherein a first contactor and a second contactor are arranged between the PLC and a drum motor of a cable drum; the first contactor and the second contactor are connected in parallel; when a signal that the jacking trolley starts to move upwards and a signal that the jacking trolley is at a lower limit position are received, the PLC controls the second contactor to be powered on and closed to enable the cable drum to release the cable; when a signal that the jacking trolley starts to move downwards and a signal that the jacking trolley is located at an upper limit position are received, the PLC controls the first contactor to be powered on and closed to enable the cable drum to roll up the cable. Through foretell device, can avoid the cable to receive the dragging deformation or the cable piles up seriously and is pressed apart in the decline process that rises to prolong the cable life, reduced equipment failure rate.
Description
Technical Field
The application relates to the technical field of metallurgical equipment, in particular to a cable drum control device of a vacuum refining RH molten steel car.
Background
Vacuum refining RH carries out secondary refining on the molten steel under the conditions of vacuum, inert gas or controlled atmosphere so as to carry out deep decarburization, deoxidation and inclusion removal. When the RH molten steel vehicle moves to the lower part of the vacuum groove, the RH molten steel vehicle top is lifted to a preset height by the jacking trolley. The RH molten steel vehicle is driven by electric power, one end of a cable used as transportation electric power is wound on a cable drum, the other end of the cable is fixed under a pit, and the cable drum is installed on one side of the molten steel vehicle. And along with the running of the molten steel car, the drum motor is synchronously operated by a frequency converter for controlling the running motor of the molten steel car to curl the cable and lay down the cable. When the RH molten steel car moves to the position below the vacuum groove, the frequency converter controls the motor of the molten steel car to stop running, and at the moment, the winding drum also stops synchronously, so that the winding drum cannot wind or lay down a cable in the subsequent lifting trolley for lifting the molten steel car, and the following problems are caused: if the reserved cable length is insufficient, the cable is obviously stretched and dragged in the RH molten steel vehicle top lifting process; in order to ensure that the cables are not pulled in the jacking process, longer cables need to be reserved, and the cables are accumulated too much on the ground when the RH molten steel car descends and are easily broken by the RH molten steel car. For a long time, the situation that the cable deforms due to stretching and stress or is broken due to stacking occurs occasionally, so that certain economic loss is caused, and meanwhile, potential safety hazards are brought to field production. Therefore, a method for solving the problem of damage to the cables caused by excessive pulling or accumulation of the cables during the lifting process of the RH molten steel car is needed.
Disclosure of Invention
The invention provides a cable reel control device of a vacuum refining RH molten steel car, which aims to solve or partially solve the technical problem of cable damage caused by over-stretched or accumulated cables of the RH molten steel car in the existing jacking process.
In order to solve the technical problem, the invention provides a cable reel control device of a vacuum refining RH molten steel car, which comprises: a cable drum control device of a vacuum refining RH molten steel car comprises a jacking lower limit sensor and a jacking upper limit sensor, wherein the jacking lower limit sensor is positioned at the lower limit of a jacking trolley running track, the jacking upper limit sensor is positioned at the upper limit of the jacking trolley running track, and the jacking lower limit sensor and the jacking upper limit sensor are respectively connected with a Programmable Logic Controller (PLC); a first contactor and a second contactor are arranged between the PLC and a drum motor of the cable drum; the first contactor and the second contactor are connected in parallel;
when a signal that the jacking trolley starts to move upwards and a signal that the jacking trolley is at a lower limit position, which are sent by a jacking lower limit sensor, are received, the PLC controls the second contactor to be powered on and closed, so that the cable drum releases the cable;
when a signal that the jacking trolley starts to move downwards and a signal that the jacking upper limit sensor sends that the jacking trolley is located at an upper limit are received, the PLC controls the first contactor to be powered on and closed, so that the cable drum can roll up the cable.
Further, the control device also comprises a jacking position sensor arranged on the running track of the RH molten steel vehicle and a frequency converter connected with the PLC, and a third contactor is arranged between the frequency converter and the drum motor, wherein the third contactor is connected with the first contactor and the second contactor in parallel;
when the RH molten steel car travels to a preset jacking position, the jacking position sensor sends a signal of the RH molten steel car at the jacking position to the PLC, and the PLC controls the third contactor to be powered off and disconnected through the frequency converter, so that the drum motor is controlled by the frequency converter to be switched to be controlled by the PLC.
Optionally, the jacking position sensor, the jacking lower limit sensor and the jacking upper limit sensor are non-contact limit switches or contact limit switches.
The invention also provides a control method of the cable reel of the vacuum refining RH molten steel car, which is applied to the cable reel control device of any vacuum refining RH molten steel car in the technical scheme, and the control method comprises the following steps:
when a signal that the jacking trolley starts to move upwards and a signal that the jacking trolley is at a lower limit position, which are sent by a jacking lower limit sensor, are received, the PLC controls the second contactor to be powered on and closed, so that the cable drum releases the cable;
when a signal that the jacking trolley starts to move downwards and a signal that the jacking upper limit sensor sends that the jacking trolley is located at an upper limit are received, the PLC controls the first contactor to be powered on and closed, so that the cable drum can roll up the cable.
Optionally, the first contactor of PLC control gets electric closure to make cable drum curl up the cable, specifically include:
the PLC controls the first contactor to be electrified and closed for 1-1.5 seconds so as to enable the drum motor to rotate positively to roll up the cable.
Optionally, the PLC controls the second contactor to be powered on and closed, so that the cable drum releases the cable, and the method specifically includes:
and the PLC controls the second contactor to be electrified and closed for 1.5-2 seconds so as to enable the drum motor to rotate reversely to release the cable.
Further, the control device also comprises a jacking position sensor arranged on the running track of the RH molten steel vehicle and a frequency converter connected with the PLC, and a third contactor is arranged between the frequency converter and the drum motor, wherein the third contactor is connected with the first contactor and the second contactor in parallel;
receiving the jacking platform truck and beginning the signal of upwards moving to and when the jacking platform truck that spacing sensor sent was in down spacing signal under the jacking, PLC control second contactor had got electric closure, so that before the cable drum released the cable, still included:
when the RH molten steel car travels to a preset jacking position, the jacking position sensor sends a signal of the RH molten steel car at the jacking position to the PLC, and the PLC controls the third contactor to be powered off and disconnected through the frequency converter, so that the drum motor is controlled by the frequency converter to be switched to be controlled by the PLC.
The invention also provides electronic equipment comprising the cable reel control device of any one of the vacuum refining RH molten steel cars in the technical scheme.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention discloses a cable reel control device of a vacuum refining RH molten steel car, which comprises a jacking lower limit sensor, a jacking upper limit sensor and a PLC (programmable logic controller), wherein when the RH molten steel car is in a jacking position for limiting and a jacking trolley starts to run upwards, the PLC controls a second contactor to be electrified and closed, so that a cable reel releases a cable, the stretching and dragging force of the cable is reduced, and the cable is prevented from being deformed excessively due to stress; when the jacking trolley is in an upper limit position and begins to move downwards, the PLC controls the first contactor to be powered on and closed, so that the cable drum can roll up the cable, and the cable is prevented from being broken due to serious cable accumulation. Therefore, by adopting the scheme, the service life of the cable can be prolonged, and the failure rate of equipment is reduced.
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. And in which like reference numerals refer to like parts throughout; in the drawings:
FIG. 1 is a schematic view showing a control apparatus of a drum of a vacuum refining RH molten steel car according to an embodiment of the present invention;
FIG. 2 is a schematic view showing a control apparatus of a drum of a vacuum refining RH molten steel car including a frequency converter and a third contactor according to an embodiment of the present invention
FIG. 3 is a diagram illustrating an RH ladle car drum integral wiring according to an embodiment of the present invention;
FIG. 4 is a schematic view showing a control of an RH molten steel vehicle according to an embodiment of the present invention while traveling;
FIG. 5 is a schematic diagram illustrating the control of an RH molten steel car during jacking according to one embodiment of the present invention;
FIG. 6 is a schematic diagram showing the state of the device after the RH molten steel car is lifted according to one embodiment of the invention;
FIG. 7 is a schematic view showing a state of an apparatus before the roof of RH molten steel is raised according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a method for controlling a cable drum of a vacuum refining RH ladle car according to an embodiment of the present invention;
description of reference numerals:
1. a drum motor; 21. a first contactor; 22. a second contactor; 23. a third contactor; 3. a PLC; 41. a jacking lower limit sensor; 42. a jacking upper limit sensor; 43. a jacking position sensor; and 5, a frequency converter.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
When an RH molten steel truck for transporting molten steel walks on the ground, a motor and a drum motor in the molten steel truck are controlled by the same frequency converter, so that the drum motor can be matched with the walking speed to synchronously rotate in the positive direction to roll up a cable in a cable drum in the walking process of the molten steel truck. The drum motor is controlled by power frequency and is a torque motor, and when the molten steel car travels forwards under the action of a frequency converter and a contactor controlled by the frequency converter, the drum motor rotates forwards to roll up a cable; when the molten steel car travels reversely, the torque generated by dragging the cable drives the winding drum motor to rotate reversely so as to put down the cable. When RH walks to the preset jacking position to wait for the jacking trolley to jack the trolley, at the moment, the frequency converter does not output a walking signal to the motor of the molten steel car any more, and simultaneously, the motor of the winding drum can not rotate continuously, so that the winding drum can not be wound or a cable can not be put down in the jacking process.
Based on the above reasons, the inventor provides, in an alternative embodiment, as shown in fig. 1, a cable drum control device for a vacuum refining RH molten steel car, which includes a jacking lower limit sensor 41 located at a lower limit of a running track of a jacking trolley and a jacking upper limit sensor 42 located at an upper limit of the running track of the jacking trolley, where the jacking lower limit sensor 41 and the jacking upper limit sensor 42 are respectively connected to a programmable logic controller PLC 3; a first contactor 21 and a second contactor 22 are arranged between the PLC3 and the reel motor 1 of the cable reel; wherein the first contactor 21 and the second contactor 22 are connected in parallel;
when a signal that the jacking trolley starts to run upwards and a signal that the jacking trolley is at a lower limit, which are sent by the jacking lower limit sensor 41, are received, the PLC3 controls the second contactor 22 to be powered on and closed, so that the cable drum releases the cable;
when a signal that the jacking trolley starts to run downwards and a signal that the jacking trolley is at an upper limit, which is sent by the jacking upper limit sensor 42, are received, the PLC3 controls the first contactor 21 to be powered on and closed, so that the cable drum winds up the cable.
In general, in order to enable the reel to still rotate forwards or backwards in the lifting process of the RH molten steel car roof so as to roll up or put down the cable, a control logic for controlling the reel motor 1 to rotate forwards or backwards according to the position of the jacking trolley and the movement signal of the RH molten steel car is added in the PLC3 so as to roll up or release the cable by the cable reel, two contactors are additionally arranged, and the reel motor 1 is enabled to rotate forwards or backwards through parallel connecting wires, which specifically comprises the following steps:
the device related in this embodiment specifically includes:
logic programmable controller PLC 3: collecting jacking upper limit and lower limit signals of a jacking trolley; in the jacking process of the RH molten steel car, controlling the first contactor 21 and the second contactor 22 to be powered on or powered off so as to control the forward rotation or the reverse rotation of the winding drum motor 1;
jacking lower limit sensor 41: the jacking trolley is positioned at the lower limit of the jacking trolley track, and when the jacking trolley reaches the lower limit, a signal is transmitted to the PLC3 so that the jacking trolley reaches the lower limit and stops;
jacking upper limit sensor 42: and when the jacking trolley reaches the upper limit, the jacking trolley transmits a signal to the PLC3 so that the jacking trolley reaches the upper limit and stops.
The embodiment discloses a cable reel control device of a vacuum refining RH molten steel car, which comprises a jacking lower limit sensor, a jacking upper limit sensor and a PLC (programmable logic controller), wherein when the RH molten steel car is at a jacking position for limiting and a jacking trolley starts to run upwards, the PLC controls a second contactor to be electrified and closed, so that a cable reel releases a cable, the pulling force of the cable is reduced, and the cable is prevented from being deformed excessively due to stress; when the jacking trolley is in an upper limit position and begins to move downwards, the PLC controls the first contactor to be powered on and closed, so that the cable drum can roll up the cable, and the cable is prevented from being broken due to serious cable accumulation. Therefore, by adopting the scheme, the service life of the cable can be prolonged, and the failure rate of equipment is reduced.
Based on the same inventive concept of the previous embodiment, in another alternative embodiment, as shown in fig. 2, the control device further includes a jacking position sensor 43 mounted on the travel rail of the RH molten steel truck and a frequency converter 5 connected to the PLC3, a third contactor 23 is provided between the frequency converter 5 and the drum motor 1, wherein the third contactor 23 is connected in parallel with the first contactor 21 and the second contactor 22;
when the RH molten steel car travels to the preset jacking position, the jacking position sensor 43 sends a signal that the RH molten steel car is positioned at the jacking position to the PLC3, and the PLC3 controls the third contactor 23 to be powered off and disconnected through the frequency converter 5, so that the drum motor 1 is controlled by the frequency converter 5 to be switched to be controlled by the PLC 3.
The newly added devices or functions in this embodiment specifically include:
PLC 3: when the RH molten steel vehicle travels on the ground, the RH molten steel vehicle communicates with the frequency converter 5 to control the RH molten steel vehicle to travel and synchronously control the operation of the drum motor 1;
jacking position sensor 43: when the RH molten steel car travels to a preset jacking position, transmitting a jacking position limiting signal of the RH molten steel car to the PLC3 so as to stop the travel of the molten steel car;
the frequency converter 5: establishing communication connection with the PLC3, and receiving a control signal of the PLC 3; the frequency converter 5 controls the RH molten steel vehicle to walk on the ground; the frequency converter 5 simultaneously controls the action of the contactor connected with the frequency converter, so that the drum motor 1 is controlled to operate;
Specifically, in order to realize that the PLC3 controls the forward rotation and the reverse rotation of the drum motor 1 in the ascending process of the jacking trolley, a system control structure is newly built, as specifically shown in fig. 3 to 5. The process of controlling the cable drum in this embodiment is mainly as follows:
when the RH molten steel car walks on the ground, the third contactor 23(KM) controlled by the frequency converter 5 is powered on and closed, and the first contactor 21(KM1) and the second contactor 22(KM2) controlled by the PLC3 are powered off and disconnected;
when the RH molten steel car is positioned at the jacking position limit and the PLC3 collects a jacking trolley ascending command signal from the RH smelting control system, the PLC3 controls the second contactor 22(KM2) to be powered on and switched off, the KM and the KM1 are powered off and switched off, and the drum motor 1 rotates reversely after the second contactor 22 is switched on to release the cable; when the cable is lifted to the upper limit of the jacking equipment, the jacking equipment stops lifting, and the state of the cable on the cable drum is the state of no stress of the cable after jacking shown in the attached figure 6;
after finishing RH refining, the jacking trolley is about to descend at the upper limit position, at the moment, after the PLC3 collects a jacking descending command signal, the PLC3 controls the first contactor 21(KM1) to be powered on and closed, the KM and the KM2 are powered off and disconnected, and after the KM1 is closed, the drum motor 1 rotates forward, so that the drum runs forward to roll up a cable; jacking equipment continues to descend, and when descending to jacking lower limit, jacking equipment descends and stops. At the moment, the cable reel is in a cable state before jacking as shown in the attached figure 7, so that the cable is prevented from being excessively accumulated on the ground in the process, and the cable is broken by an RH molten steel vehicle.
When the RH molten steel car is limited at the jacking position and the PLC3 receives a signal for controlling the RH molten steel car to walk on the ground, the KM1 is disconnected, the KM is closed, and the drum motor 1 is controlled by the frequency converter 5 again.
In order to avoid the short-circuit accident of the power supply caused by the simultaneous closing of the contactors, reliable interlocking should be adopted in the circuit, for example, a control method of the motor with double interlocking of the button and the contactor, which runs in the positive direction and the negative direction, can be used.
Generally speaking, steel plants are equipped with two sets of RH refining furnaces, the loss of the towing cables and the failure rate of equipment are reduced by implementing the scheme, the adverse effect on production is avoided, and the cost can be saved by more than 5 ten thousand yuan per year.
Alternatively, the jacking position sensor 43, the jacking lower limit sensor 41 and the jacking upper limit sensor 42 may use a contact-type limit switch, such as a mechanical tooth-striking limit switch, or a non-contact-type limit switch (sensor), such as an inductive limit switch or an optical limit switch.
Based on the same inventive concept of the foregoing embodiments, in some alternative embodiments, as shown in fig. 8, there is provided a method for controlling a cable reel of a vacuum refining RH molten steel car, which is applied to a cable reel control device of a vacuum refining RH molten steel car in any one of the foregoing embodiments, and specifically includes:
s81: when a signal that the jacking trolley starts to run upwards and a signal that the jacking trolley is at a lower limit, which are sent by the jacking lower limit sensor 41, are received, the PLC3 controls the second contactor 22 to be powered on and closed, so that the cable drum releases the cable;
s82: when a signal that the jacking trolley starts to run downwards and a signal that the jacking trolley is at an upper limit, which is sent by the jacking upper limit sensor 42, are received, the PLC3 controls the first contactor 21 to be powered on and closed, so that the cable drum winds up the cable.
In the process of jacking the RH molten steel car, the reel motor 1 does not need to continuously release or roll up the cable in the whole jacking or descending process in consideration of the existing cable length allowance. Based on the same inventive concept of the previous embodiment, in other alternative embodiments, the PLC3 controls the first contactor 21 to be electrically closed, so as to wind the cable from the cable reel, specifically including: the PLC3 controls the first contactor 21 to be electrically closed for 1 second to 1.5 seconds to rotate the drum motor 1 in the forward direction to wind up the cable.
After the operation of the preset time, the cable can be rolled up by 1-2 meters, the problem that the cable is accumulated on the ground and is likely to be broken in the descending process of the jacking trolley can be avoided, and the energy can be saved.
Based on the same inventive concept of the previous embodiment, in other alternative embodiments, the PLC3 controls the second contactor 22 to be electrically closed so as to enable the cable drum to release the cable, specifically including: the PLC3 controls the second contactor 22 to be electrically closed for 1.5-2 seconds to reverse the rotation of the drum motor 1 to release the cable.
After the operation of the preset time, the cable can be laid down for 1-2 m, so that the problem that the cable is stretched, dragged and deformed in the ascending process of the jacking trolley can be avoided, and the energy can be saved.
Based on the same inventive concept of the previous embodiment, in other alternative embodiments, the control device further includes a jacking position sensor 43 mounted on the travel rail of the RH molten steel vehicle and a frequency converter 5 connected with the PLC3, a third contactor 23 is arranged between the frequency converter 5 and the drum motor 1, wherein the third contactor 23 is connected in parallel with the first contactor 21 and the second contactor 22;
at S81: when receiving the signal that jacking platform truck began upwards to move to and jacking platform truck that spacing sensor 41 sent down in the jacking is in down spacing signal, PLC3 control second contactor 22 gets the electricity closed to before making the cable drum release the cable, still include:
s80: when the RH molten steel car travels to the preset jacking position, the jacking position sensor 43 sends a signal that the RH molten steel car is positioned at the jacking position to the PLC3, and the PLC3 controls the third contactor 23 to be powered off and disconnected through the frequency converter 5, so that the drum motor 1 is controlled by the frequency converter 5 to be switched to be controlled by the PLC 3.
Based on the same inventive concept of the previous embodiment, in other alternative embodiments, an electronic device is provided, which comprises the cable reel control device of the vacuum refining RH ladle car of any one of the previous embodiments.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention discloses a cable reel control device of a vacuum refining RH molten steel car, which comprises a jacking lower limit sensor, a jacking upper limit sensor and a PLC (programmable logic controller), wherein when the RH molten steel car is in a jacking position for limiting and a jacking trolley starts to run upwards, the PLC controls a second contactor to be electrified and closed, so that a cable reel releases a cable, the stretching and dragging force of the cable is reduced, and the cable is prevented from being deformed excessively due to stress; when the jacking trolley is in an upper limit position and begins to move downwards, the PLC controls the first contactor to be powered on and closed, so that the cable drum can roll up the cable, and the cable is prevented from being broken due to serious cable accumulation. Therefore, by adopting the scheme, the service life of the cable can be prolonged, and the failure rate of equipment is reduced.
While the preferred embodiments of the present application 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 alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (8)
1. A cable drum control device of a vacuum refining RH molten steel car is characterized by comprising a jacking lower limit sensor positioned at the lower limit of a jacking trolley running track and a jacking upper limit sensor positioned at the upper limit of the jacking trolley running track, wherein the jacking lower limit sensor and the jacking upper limit sensor are respectively connected with a Programmable Logic Controller (PLC); a first contactor and a second contactor are arranged between the PLC and a drum motor of the cable drum; wherein the first contactor and the second contactor are connected in parallel;
when a signal that the jacking trolley starts to move upwards and a signal that the jacking trolley is at a lower limit position, which are sent by the jacking lower limit sensor, are received, the PLC controls the second contactor to be powered on and closed, so that the cable drum releases a cable;
when a signal that the jacking trolley starts to move downwards is received and the jacking upper limit sensor sends a signal that the jacking trolley is located at an upper limit position, the PLC controls the first contactor to be powered on and closed, so that the cable drum can roll up the cable.
2. The control device of claim 1, further comprising a lift-up position sensor mounted on the RH molten steel vehicle traveling rail and a frequency converter connected to the PLC, wherein a third contactor is provided between the frequency converter and the drum motor, and the third contactor is connected in parallel to the first contactor and the second contactor;
when the RH molten steel car travels to a preset jacking position, the jacking position sensor sends a signal that the RH molten steel car is positioned at the jacking position to the PLC, and the PLC controls the third contactor to be powered off and disconnected through the frequency converter, so that the drum motor is controlled by the frequency converter to be switched to be controlled by the PLC.
3. The control device according to claim 2, wherein the jacking position sensor, the jacking lower limit sensor and the jacking upper limit sensor are non-contact limit switches or contact limit switches.
4. A control method of a cable reel of a vacuum refining RH molten steel car, which is applied to the control device of the cable reel of the vacuum refining RH molten steel car as claimed in any one of claims 1 to 3, and is characterized in that the method comprises the following steps:
when a signal that the jacking trolley starts to move upwards and a signal that the jacking trolley is at a lower limit position, which are sent by the jacking lower limit sensor, are received, the PLC controls the second contactor to be powered on and closed, so that the cable drum releases a cable;
when a signal that the jacking trolley starts to move downwards is received and the jacking upper limit sensor sends a signal that the jacking trolley is located at an upper limit position, the PLC controls the first contactor to be powered on and closed, so that the cable drum can roll up the cable.
5. The control method according to claim 4, wherein the PLC controls the first contactor to be electrically closed so as to enable the cable reel to reel up the cable, and the control method specifically comprises the following steps:
and the PLC controls the first contactor to be electrified and closed for 1-1.5 seconds so as to enable the drum motor to rotate positively to wind up the cable.
6. The control method according to claim 4, wherein the PLC controls the second contactor to be electrically closed so as to enable the cable reel to release the cable, and the method specifically comprises the following steps:
and the PLC controls the second contactor to be electrified and closed for 1.5-2 seconds so as to enable the drum motor to rotate reversely to release the cable.
7. The control method according to claim 4, wherein the control device further comprises a jacking position sensor mounted on the RH molten steel vehicle traveling rail and a frequency converter connected with the PLC, and a third contactor is arranged between the frequency converter and the drum motor, wherein the third contactor is connected with the first contactor and the second contactor in parallel;
when a signal that the jacking trolley starts to move upwards is received and the jacking trolley sent by the jacking lower limit sensor is in a lower limit signal, the PLC controls the second contactor to be powered on and closed, so that before the cable drum releases the cable, the method further comprises the following steps:
when the RH molten steel car travels to a preset jacking position, the jacking position sensor sends a signal that the RH molten steel car is positioned at the jacking position to the PLC, and the PLC controls the third contactor to be powered off and disconnected through the frequency converter, so that the drum motor is controlled by the frequency converter to be switched to be controlled by the PLC.
8. An electronic apparatus comprising the cable reel control device for a vacuum refining RH ladle car as defined in any one of claims 1 to 3.
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| CN201911279061.5A CN111123821B (en) | 2019-12-13 | 2019-12-13 | Cable reel control device of vacuum refining RH molten steel car |
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| CN201911279061.5A CN111123821B (en) | 2019-12-13 | 2019-12-13 | Cable reel control device of vacuum refining RH molten steel car |
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|---|---|
| CN111123821B (en) | 2023-05-12 |
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