CN113291999A - Blast furnace winch control system with automatically switched encoders and switching method thereof - Google Patents

Blast furnace winch control system with automatically switched encoders and switching method thereof Download PDF

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Publication number
CN113291999A
CN113291999A CN202110750449.XA CN202110750449A CN113291999A CN 113291999 A CN113291999 A CN 113291999A CN 202110750449 A CN202110750449 A CN 202110750449A CN 113291999 A CN113291999 A CN 113291999A
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China
Prior art keywords
frequency converter
encoder
electrically connected
switching
control system
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Pending
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CN202110750449.XA
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Chinese (zh)
Inventor
朱国青
郎兵
祁文慧
张培贤
李成宗
岳岚霞
曲栋
杨显鹏
许存生
宋吉彬
王艳灵
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Qinghai Xigang Automation Information Technology Co ltd
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Qinghai Xigang Automation Information Technology Co ltd
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Priority to CN202110750449.XA priority Critical patent/CN113291999A/en
Publication of CN113291999A publication Critical patent/CN113291999A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/42—Control devices non-automatic
    • B66D1/46—Control devices non-automatic electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/48—Control devices automatic
    • B66D1/485—Control devices automatic electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/54—Safety gear
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Feedback Control In General (AREA)

Abstract

The invention discloses a blast furnace winch control system with an automatic encoder switching function and a switching method thereof, wherein the system comprises a winch control system and a switching control system; the winch control system comprises: the system comprises a first motor, a first encoder, a second motor, a first frequency converter, a second frequency converter, a third frequency converter and winch control equipment; the switching control system comprises: the device comprises a touch screen, a switching controller and a relay group; the touch screen is connected with the switching controller; the switching controller is electrically connected with each relay control coil in the relay group; the system improves the stability and reliability of the control system of the blast furnace winch, greatly reduces the failure rate caused by the encoder, facilitates quick confirmation and maintenance of failure points, and reduces the operation and maintenance time cost of enterprises.

Description

Blast furnace winch control system with automatically switched encoders and switching method thereof
Technical Field
The invention relates to the technical field of winch control, in particular to a blast furnace winch control system with an automatic encoder switching function and a switching method thereof.
Background
The blast furnace feeding mode mainly comprises the steps of hoisting trolley feeding and conveying belt feeding. The main working process of the hoisting trolley feeding equipment comprises the steps that various raw materials are placed into a centralized hopper through batching below a groove, after a skip car arrives at a material pit, a door of the centralized hopper is automatically opened, the raw materials are placed into the skip car, a gate of the centralized hopper is closed in place, the skip car is started, the skip car is accelerated, decelerated at a constant speed and reaches the top of the furnace to stop, then a rear wheel of the trolley is lifted by utilizing a discharging curved rail and automatically inclined to a certain angle for discharging, and the trolley returns after discharging. In the working process, 2 material trucks are loaded alternately, and when the material truck filled with the furnace burden moves upwards, the material truck moves downwards; the hoisting trolley feeding equipment is compact in structure and small in occupied area, and automatic and semi-automatic control is realized when the feeding capacity can be guaranteed and met. In the prior art, the transmission control mode of the hoisting trolley is that two asynchronous motors are adopted to simultaneously control the forward and reverse rotation of one hoisting machine to be directly started. The two asynchronous motors are cooperatively controlled by two frequency converters (a master and a slave) and related winch control equipment to complete feeding, and the frequency converters are communicated through optical fibers. Wherein the rotating speed of the motor is fed back to the frequency converter through the encoder. The system has complex circuit and complicated switching process of the reverse machine, if the encoder fails, the feeding of the winch motor cannot be continuously controlled, and meanwhile, the system is not convenient for the inspection and maintenance of maintenance personnel.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a blast furnace winch control system with an automatically switched encoder and a switching method thereof.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a blast furnace winch control system with an automatically switched encoder comprises a winch control system and a switching control system; the winch control system comprises: the system comprises a first motor, a first encoder, a second motor, a first frequency converter, a second frequency converter, a third frequency converter and winch control equipment; the first encoder is arranged on the first motor, and the second encoder is arranged on the second motor; the first frequency converter and the second frequency converter are electrically connected with the first motor through a contactor KM1 and a contactor KM2 respectively; the second frequency converter and the third frequency converter are electrically connected with the second motor through a contactor KM3 and a contactor KM4 respectively; the control ends of the contactors KM1, KM2, KM3 and KM4 are connected with a winch control device;
the switching control system comprises: the device comprises a touch screen, a switching controller and a relay group; the touch screen is connected with the switching controller; the switching controller is electrically connected with each relay control coil in the relay group; the contact of each relay of the relay group is respectively and electrically connected with the first frequency converter, the second frequency converter, the third frequency converter, the first encoder and the second encoder; the state of each relay in the relay group is controlled through the switching controller, the output ends of the first encoder and the second encoder are respectively switched to two of the first frequency converter, the second frequency converter and the third frequency converter, or the output end of the first encoder is switched to two of the first frequency converter, the second frequency converter and the third frequency converter, or the output end of the second encoder is switched to two of the first frequency converter, the second frequency converter and the third frequency converter.
And the output end switching controller of the first encoder and the second encoder is electrically connected.
The control ends of the contactors KM1, KM2, KM3 and KM4 are respectively connected with relays KA11, KA12, KA13 and KA14 in parallel; the relays KA11, KA12, KA13 and KA14 are electrically connected with the switching controller;
the switching controller is connected with a switching switch with three states of automatic or manual operation or non-selection and an indicator light for lighting when the second frequency converter is a host;
preferably, the relay set comprises KA1, KA2, KA3, KA4, KA5, KA6, KA7, KA8, KA9 and KA 10; the encoder I is electrically connected with the frequency converter I through the normally closed contacts of KA1, KA2 and KA 3; the second encoder is electrically connected with the third frequency converter 7 through normally closed contacts of KA5, KA6 and KA 7; normally open contacts of KA1, KA2 and KA3 are electrically connected with normally open contacts of KA5, KA6 and KA7 respectively; normally open contacts of KA1, KA2, KA5 and KA6 are electrically connected with the second frequency converter; the normally open contacts of KA3 and KA7 are electrically connected with the normally open contacts of KA4 and KA8 respectively; the normally closed contact of KA4 is electrically connected with the normally closed contact of KA 8; the KA4 and KA8 normally open contacts are electrically connected with KA9 and KA10 respectively; the normally open contact of the KA9 is electrically connected with the normally open contact of the KA10 and the second frequency converter; the normally closed contact of the KA9 is electrically connected with the third frequency converter; the normally closed contact of the KA10 is electrically connected with the first frequency converter.
Preferably, the output of the switching controller is connected with the input end of the winch control device through a switching signal.
Preferably, the switching controller comprises a master PLC and a slave PLC; one output end of the master PLC is electrically connected with one input end of the slave PLC; the signal input into the switching controller is simultaneously connected with the input ends of the master PLC and the slave PLC, and the signal output from the switching controller is simultaneously connected with the output ends of the master PLC and the slave PLC.
Preferably, the switching method of the blast furnace winch control system with the automatic switching of the encoder is completed through the operation of a touch screen and a switch; the touch screen is provided with a main interface and a control display interface;
the method comprises the following steps:
firstly, controlling a change-over switch according to the switching state of a second frequency converter in the current winch control system;
the switch has the following states:
automatic: the system automatically determines whether the frequency converter is a host or a slave or a standby according to the states of the relays KA11, KA12, KA13 and KA 14;
manual operation: the second is that the current state down-converter is directly selected by manpower;
selecting no; the second current state down converter is not put into use and is standby;
the touch screen displays the state of the change-over switch and the information whether the second state frequency converter is the host on the main interface according to the current state;
and secondly, clicking a main interface of the touch screen to enter a control display interface, and displaying the switching states of the current encoder and the current frequency converter and the state of the main PLC on the control display interface in a schematic diagram and character mode.
Preferably, the control display interface is provided with a 'PLC interface' button and a 'help' button, the 'PLC interface' button is clicked to enter the PLC interface, and the PLC interface displays the states of the current input and output interfaces of the master PLC and the slave PLC as well as the functions of the input and output interfaces and the position information of the connected devices;
and clicking a help button to enter a truth table interface, and displaying the relationship between the state of each relay in the relay group and the switching of the control encoder.
Compared with the prior art, the invention has the following beneficial effects:
the system improves the stability and reliability of the control system of the blast furnace winch, greatly reduces the failure rate caused by the encoder, facilitates quick confirmation and maintenance of failure points, reduces the operation and maintenance time cost of enterprises, is convenient to operate and maintain, lightens the work of maintainers, and obtains good economic benefits.
Drawings
FIG. 1 is a block diagram of a control system of a blast furnace hoist with an automatically switched encoder according to the present invention;
FIG. 2 is a circuit diagram of a switching system in a blast furnace hoist control system with an encoder automatically switched according to the present invention;
FIG. 3 is a main interface of a blast furnace winch control system with automatically switched encoders and a switching method thereof according to the present invention;
FIG. 4 is a control display interface of the switching method of the automatic switching encoder control system of the blast furnace hoist according to the present invention;
FIG. 5 is a PLC interface of a blast furnace hoist control system with automatically switched encoders and a switching method thereof according to the present invention;
FIG. 6 is a truth table interface of the switching method of the control system of the blast furnace hoist with the automatic switching of the encoder according to the present invention;
in the figure: the system comprises a touch screen 1, a switching controller 2, a master PLC201, a slave PLC202, a selector switch 203, an indicator lamp 204, a winch control system 3, a relay group 4, a first motor 301, a first encoder 302, a second encoder 303, a second motor 304, a first frequency converter 305, a second frequency converter 306, a third frequency converter 307, winch control equipment 308, a master interface 5, a control display interface 6, a PLC interface 7 and a truth table interface 8.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described as follows:
as shown in fig. 1-2, in one embodiment of the present invention, an encoder automatic switching blast furnace hoist control system comprises a hoist control system 3 and a switching control system; the hoist control system 3 includes: the system comprises a first motor 301, a first encoder 302, a second encoder 303, a second motor 304, a first frequency converter 305, a second frequency converter 306, a third frequency converter 307 and a winch control device 308; the first encoder 302 is installed on the first motor 301, and the second encoder 303 is installed on the second motor 304; the first frequency converter 305 and the second frequency converter 306 are electrically connected with the first motor 301 through a contactor KM1 and a contactor KM2 respectively; the second frequency converter 306 and the third frequency converter 307 are electrically connected with the second motor 304 through a contactor KM3 and a contactor KM4 respectively; the control ends of the contactors KM1, KM2, KM3 and KM4 are connected with the winch control equipment 308; the winch control equipment 308 completes switching of the first frequency converter 305, the second frequency converter 306 and the third frequency converter 307 through contactors KM1, KM2, KM3 and KM4, wherein the first frequency converter 305 is used as a master to control only the first motor 301, the second frequency converter 306 can be used as a master or a slave, and can control the first motor 301 or the second motor 304, and the third frequency converter 307 is used as a slave to control only the second motor 304, so that the second frequency converter 306 is reserved;
the switching control system comprises: the system comprises a touch screen 1, a switching controller 2 and a relay group 4; the touch screen 1 is connected with the switching controller 2; the switching controller 2 is electrically connected with each relay control coil in the relay group 4; the contact of each relay of the relay group 4 is respectively and electrically connected with a first frequency converter 305, a second frequency converter 306, a third frequency converter 307, a first encoder 302 and a second encoder 303; the state of each relay in the relay group 4 is controlled by the switching controller 2, the output ends of the first encoder 302 and the second encoder 303 are respectively switched to two frequency converters of the first frequency converter 305, the second frequency converter 306 and the third frequency converter 307, or the output end of the first encoder 302 is switched to two frequency converters of the first frequency converter 305, the second frequency converter 306 and the third frequency converter 307, or the output end of the second encoder 303 is switched to two frequency converters of the first frequency converter 305, the second frequency converter 306 and the third frequency converter 307; therefore, the switching of the two encoders on the three frequency converters is realized, and the switching of the machine switching and the maintenance are convenient;
the output end switching controller 2 of the first encoder 302 and the second encoder 303 is electrically connected, and whether the output ends of the first encoder 302 and the second encoder 303 are in failure can be judged through the switching controller 2.
The control ends of the contactors KM1, KM2, KM3 and KM4 are respectively connected with relays KA11, KA12, KA13 and KA14 in parallel; the relays KA11, KA12, KA13 and KA14 are electrically connected with the switching controller 2; the switching states of the first frequency converter 305, the second frequency converter 306 and the third frequency converter 307 at present are obtained by acquiring the states of the relays KA11, KA12, KA13 and KA14 through the switching controller 2.
The switching controller 2 is connected with a switch 203 with three states of automatic or manual or non-selection and an indicator lamp 204 which is used for lighting when the second frequency converter 306 is a host;
automatic: the system automatically determines whether the second frequency converter 306 is a master machine, a slave machine or a standby machine according to the states of the relays KA11, KA12, KA13 and KA 14;
manual operation: the second down converter 306 in the current state is manually and directly selected as a host;
selecting no; the second frequency converter 306 is not put into use at present and is standby;
specifically, the relay set 4 comprises KA1, KA2, KA3, KA4, KA5, KA6, KA7, KA8, KA9 and KA 10; the encoder I302 is electrically connected with the frequency converter I305 through normally closed contacts of KA1, KA2 and KA 3; the second encoder 303 is electrically connected with the third frequency converter 307 through normally closed contacts of KA5, KA6 and KA 7; normally open contacts of KA1, KA2 and KA3 are electrically connected with normally open contacts of KA5, KA6 and KA7 respectively; normally open contacts of KA1, KA2, KA5 and KA6 are electrically connected with the second frequency converter 306; the normally open contacts of KA3 and KA7 are electrically connected with the normally open contacts of KA4 and KA8 respectively; the normally closed contact of KA4 is electrically connected with the normally closed contact of KA 8; the KA4 and KA8 normally open contacts are electrically connected with KA9 and KA10 respectively; the normally open contact of the KA9 is electrically connected with the normally open contact of the KA10 and the second frequency converter 306; the normally closed contact of the KA9 is electrically connected with the third frequency converter 307; the normally closed contact of the KA10 is electrically connected with the first frequency converter 305.
The truth table for controlling the encoder switching in the above connection is shown in table 1 below, wherein Z11: frequency converter one 305; z12, a second frequency converter 306; z13, a frequency converter III 307; ON indicates the relay is closed;
table 1 truth table of relay group
Figure BDA0003145995950000081
In a specific embodiment of the present invention, the output of the switching controller 2 is connected to the input of the winch control device 308 via a switching signal; when the change-over switch 203 is in the automatic state, an initial control signal is given to the winch control device 308, the second frequency converter 306 is used as a main machine, and the first frequency converter 305 is switched off for standby.
In one embodiment of the present invention, the switching controller 2 comprises a master PLC201 and a slave PLC 202; one output end of the master PLC201 is electrically connected with one input end of the slave PLC 202; used for judging whether the main PLC201 normally operates; the signal inputted to the switching controller 2 is simultaneously connected to the input terminals of the master PLC201 and the slave PLC202, and the signal outputted from the switching controller 2 is simultaneously connected to the output terminals of the master PLC201 and the slave PLC 202.
As shown in fig. 3 to 6, a switching method of a blast furnace hoist control system with an automatically switched encoder includes:
the operation is completed through the touch screen 1 and the change-over switch 203;
the touch screen 1 is provided with a main interface 5 and a control display interface 6;
firstly, controlling a change-over switch 203 according to the switching state of a second frequency converter 306 in the current winch control system 3;
the switch has the following states:
automatic: the system automatically determines whether the second frequency converter 306 is a master machine, a slave machine or a standby machine according to the states of the relays KA11, KA12, KA13 and KA 14;
manual operation: the second current state frequency converter 306 is manually and directly selected as a host;
selecting no; the second current-shaped down converter 306 is not put into use and is standby;
the touch screen 1 displays the state of the change-over switch 203 and information whether the state frequency converter II 306 is the host on the main interface according to the current state;
secondly, clicking a main interface 5 of the touch screen 1 to enter a control display interface 6, and displaying the switching state of the current encoder and the current frequency converter and the state of the main PLC on the control display interface 6 in a schematic diagram and character mode; and a visual control state is provided for a user, and the fault confirmation, maintenance and overhaul of the encoder are facilitated.
Specifically, a 'PLC interface' button and a 'help' button are arranged on the control display interface 6, the 'PLC interface' button is clicked to enter the PLC interface 7, the PLC interface 7 displays the current input/output interface states of the master PLC201 and the slave PLC202, and the functions of the input/output interfaces and the position information of the connected devices, so that an operator can quickly locate and repair a fault;
clicking a help button, entering a truth table interface 8, and displaying the relationship between the state of each relay in the relay group and the switching of the control encoder (as shown in table 1); the operator can understand and troubleshoot conveniently.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention by equivalent replacement or change according to the technical solution and the modified concept of the present invention within the technical scope of the present invention.

Claims (6)

1. A blast furnace winch control system with an automatically switched encoder comprises a winch control system and a switching control system; the winch control system comprises: the system comprises a first motor, a first encoder, a second motor, a first frequency converter, a second frequency converter, a third frequency converter and winch control equipment; the first encoder is arranged on the first motor, and the second encoder is arranged on the second motor; the first frequency converter and the second frequency converter are electrically connected with the first motor through a contactor KM1 and a contactor KM2 respectively; the second frequency converter and the third frequency converter are electrically connected with the second motor through a contactor KM3 and a contactor KM4 respectively; the control ends of the contactors KM1, KM2, KM3 and KM4 are connected with a winch control device;
the switching control system comprises: the device comprises a touch screen, a switching controller and a relay group; the touch screen is connected with the switching controller; the switching controller is electrically connected with each relay control coil in the relay group; the contact of each relay of the relay group is respectively and electrically connected with the first frequency converter, the second frequency converter, the third frequency converter, the first encoder and the second encoder; the state of each relay in the relay group is controlled through the switching controller, the output ends of the first encoder and the second encoder are respectively switched to two of the first frequency converter, the second frequency converter and the third frequency converter, or the output end of the first encoder is switched to two of the first frequency converter, the second frequency converter and the third frequency converter, or the output end of the second encoder is switched to two of the first frequency converter, the second frequency converter and the third frequency converter.
The output end switching controller of the first encoder and the output end switching controller of the second encoder are electrically connected;
the control ends of the contactors KM1, KM2, KM3 and KM4 are respectively connected with relays KA11, KA12, KA13 and KA14 in parallel; the relays KA11, KA12, KA13 and KA14 are electrically connected with the switching controller;
the switching controller is connected with a switch with three states of automatic or manual operation or non-selection and an indicator light which is used for lighting when the second frequency converter is a host.
2. The blast furnace winch control system with the automatically switched encoder according to claim 1, wherein: the switching controller comprises a master PLC and a slave PLC; one output end of the master PLC is electrically connected with one input end of the slave PLC; the signal input into the switching controller is simultaneously connected with the input ends of the master PLC and the slave PLC, and the signal output from the switching controller is simultaneously connected with the output ends of the master PLC and the slave PLC.
3. The control system of the blast furnace winch with the automatically switched encoder according to claim 2, wherein: the relay group comprises KA1, KA2, KA3, KA4, KA5, KA6, KA7, KA8, KA9 and KA 10; the encoder I is electrically connected with the frequency converter I through the normally closed contacts of KA1, KA2 and KA 3; the second encoder is electrically connected with the third frequency converter 7 through normally closed contacts of KA5, KA6 and KA 7; normally open contacts of KA1, KA2 and KA3 are electrically connected with normally open contacts of KA5, KA6 and KA7 respectively; normally open contacts of KA1, KA2, KA5 and KA6 are electrically connected with the second frequency converter; the normally open contacts of KA3 and KA7 are electrically connected with the normally open contacts of KA4 and KA8 respectively; the normally closed contact of KA4 is electrically connected with the normally closed contact of KA 8; the KA4 and KA8 normally open contacts are electrically connected with KA9 and KA10 respectively; the normally open contact of the KA9 is electrically connected with the normally open contact of the KA10 and the second frequency converter; the normally closed contact of the KA9 is electrically connected with the third frequency converter; the normally closed contact of the KA10 is electrically connected with the first frequency converter.
4. The control system of the blast furnace winch with the automatically switched encoder according to claim 2, wherein: and one path of switching signal output by the switching controller is connected with the input end of the winch control equipment.
5. The switching method of the blast furnace winch control system with the automatically switched encoder according to claim 3 or 4, which is completed through the operation of a touch screen and a switch; the touch screen is provided with a main interface and a control display interface; the method is characterized in that:
the method comprises the following steps:
firstly, controlling a change-over switch according to the switching state of a second frequency converter in the current winch control system;
the switch has the following states:
automatic: the system automatically determines whether the frequency converter is a host or a slave or a standby according to the states of the relays KA11, KA12, KA13 and KA 14;
manual operation: the second is that the current state down-converter is directly selected by manpower;
selecting no; the second current state down converter is not put into use and is standby;
the touch screen displays the state of the change-over switch and the information whether the second state frequency converter is the host on the main interface according to the current state;
and secondly, clicking a main interface of the touch screen to enter a control display interface, and displaying the switching states of the current encoder and the current frequency converter and the state of the main PLC on the control display interface in a schematic diagram and character mode.
6. The switching method of the control system of the blast furnace winch with the automatically switched encoder according to claim 5, wherein the control system comprises: the control display interface is provided with a PLC interface button and a help button, the PLC interface button is clicked to enter the PLC interface, and the PLC interface displays the current input and output interface states of the master PLC and the slave PLC as well as the functions of the input and output interfaces and the position information of connected devices;
and clicking a help button to enter a truth table interface, and displaying the relationship between the state of each relay in the relay group and the switching of the control encoder.
CN202110750449.XA 2021-07-02 2021-07-02 Blast furnace winch control system with automatically switched encoders and switching method thereof Pending CN113291999A (en)

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CN202110750449.XA CN113291999A (en) 2021-07-02 2021-07-02 Blast furnace winch control system with automatically switched encoders and switching method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110750449.XA CN113291999A (en) 2021-07-02 2021-07-02 Blast furnace winch control system with automatically switched encoders and switching method thereof

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