CN111077842B - Automatic switching control system for alloy electric vibration fault behind converter - Google Patents
Automatic switching control system for alloy electric vibration fault behind converter Download PDFInfo
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- CN111077842B CN111077842B CN201911278104.8A CN201911278104A CN111077842B CN 111077842 B CN111077842 B CN 111077842B CN 201911278104 A CN201911278104 A CN 201911278104A CN 111077842 B CN111077842 B CN 111077842B
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- 239000000956 alloy Substances 0.000 title claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 28
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 230000002045 lasting effect Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 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
- G05B19/058—Safety, monitoring
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/466—Charging device for converters
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- 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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Abstract
The invention belongs to the technical field of metallurgical equipment, and discloses an automatic switching control system for electric vibration faults of converter rear alloy, which comprises: WINCC, PLC, frequency converter, first and second motors, first and second circuit breakers; WINCC is connected with the frequency converter through PLC, and the control panel of the frequency converter is connected with the auxiliary contacts of the first circuit breaker and the second circuit breaker; the power supply end of the frequency converter is connected with the main contacts of the first circuit breaker and the second circuit breaker, the first circuit breaker is connected with the first motor, and the second circuit breaker is connected with the second motor; a fault parameter scheme and a normal parameter scheme are arranged in the frequency converter; when the frequency converter detects the level signal change of the auxiliary contact of the first circuit breaker or the second circuit breaker, the working parameters of the frequency converter are switched from a normal parameter scheme to a fault switching scheme. The frequency converter automatically judges whether the frequency converter has a fault in operation or not, and then controls whether the frequency converter operates or is in a standby state after automatic reset. The system provided by the invention can realize high-timeliness fault switching and maintain the stable work of the electric vibration.
Description
Technical Field
The invention relates to the technical field of metallurgical equipment, in particular to an automatic switching control system for electric vibration faults of alloy behind a converter.
Background
Alloy electric vibration behind the steelmaking converter is key equipment for feeding the steelmaking converter, and two electric vibration motors are uniformly controlled by one frequency converter to synchronously operate. However, when one of the motors fails, an operator is required to manually change the parameters of the frequency converter on site to drive the remaining electric vibration motor to operate, so that the stable performance of the alloy electric vibration is ensured. The failure treatment time is poor, the charging time and the steel-making time are influenced, and the smooth production is restricted.
Disclosure of Invention
The invention provides an automatic switching control system for alloy electric vibration faults behind a converter, which solves the technical problem that in the prior art, the processing timeliness of the alloy electric vibration motor faults is poor.
In order to solve the technical problem, the invention provides an automatic switching control system for the electric vibration fault of alloy after a converter, which comprises: the system comprises a WINCC monitoring system, a PLC programmable controller, a frequency converter, a first circuit breaker, a first motor, a second circuit breaker and a second motor;
the WINCC monitoring system is connected with the PLC, the PLC is connected with the frequency converter, and a control panel of the frequency converter is connected with an auxiliary contact of the first circuit breaker and an auxiliary contact of the second circuit breaker;
the power supply end of the frequency converter is connected with a main contact of the first circuit breaker and a main contact of the second circuit breaker, the first circuit breaker is connected with the first motor, and the second circuit breaker is connected with the second motor;
the frequency converter is provided with a motor fault parameter scheme and a motor normal parameter scheme;
when the frequency converter detects that the level signal of the auxiliary contact of the first circuit breaker or the second circuit breaker changes, the motor control parameter of the frequency converter is switched to a motor fault parameter scheme from a motor normal parameter scheme, meanwhile, the frequency converter sends an auxiliary contact level change signal to the PLC, and the PLC sends a motor fault alarm signal to the WINCC monitoring system.
Further, the input terminal of the control board of the frequency converter is connected with the auxiliary contact of the first circuit breaker and the auxiliary contact of the second circuit breaker;
when the auxiliary contact of the first circuit breaker or the auxiliary contact of the second circuit breaker is disconnected, the motor control parameter scheme in the frequency converter is the motor fault parameter scheme;
when the auxiliary contacts of the first circuit breaker and the second circuit breaker are all closed, the motor control parameter scheme in the frequency converter is the normal parameter scheme of the motor;
the motor normal parameter scheme is rated values of two motors, and the motor fault parameter scheme is rated value of one motor;
when the motor parameter control scheme of the frequency converter is switched from the motor normal parameter scheme to the motor fault parameter scheme, the output of the frequency converter is changed from the original two motor parameters to one motor parameter, so that the operation mode of controlling the two motors is switched to the operation mode of controlling one motor.
Further, the frequency converter is a Siemens 6SE70 frequency converter.
Further, the WINCC monitoring system is a Siemens WINCC monitoring system.
Further, when the frequency converter detects an opening signal of the auxiliary contact of the first circuit breaker or the auxiliary contact of the second circuit breaker, the frequency converter immediately resets the fault with a pulse lasting 0.5 s.
Further, when the frequency converter detects a breaking signal of the auxiliary contact of the first circuit breaker or the auxiliary contact of the second circuit breaker, the frequency converter transmits a fault signal to the PLC;
after the PLC receives the fault signal, on one hand, sends alarm information to the WINCC monitoring system to prompt that the electric vibration motor has a fault, and on the other hand, the PLC detects whether the fault occurs in the operation process of the frequency converter or not, if so, the PLC executes a skip command, after the skip, the PLC automatically starts another normal electric vibration motor to operate at a speed of 50hz, and if not, the PLC does not skip and waits for the start command to avoid the automatic operation of the electric vibration motor when the charging is not needed.
Further, the detecting, by the PLC programmable controller, whether a fault occurs during operation of the frequency converter specifically includes:
a fault exists when the high level of bit 2 goes low and the low level of bit 3 goes high as determined by bits 2 and 3 of the status word 1 of the frequency converter.
Further, a fault interlocking button is arranged in the WINCC monitoring system;
when the automatic reset and automatic operation functions are normally put into use, the fault interlocking button is clicked, and fault interlocking control is put into use;
when the motor is in failure, clicking the failure interlocking button to withdraw from the interlocking to control another automatically-operated motor to stop
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the automatic switching control system for the converter rear alloy electric vibration fault provided by the embodiment of the application sets two groups of motor operation control parameters in a frequency converter: the motor normal parameter scheme and the motor fault parameter scheme respectively correspond to the normal operation of two motors and the fault of one motor, and level signals fed back by auxiliary contacts of the first circuit breaker and the second circuit breaker are used as the basis for switching two groups of parameter schemes of the frequency converter, so that feedback control is realized; furthermore, the switching can be realized in high time efficiency by feeding back signals of the auxiliary contacts of the circuit breaker; further, whether the frequency converter has a fault in the operation process is detected in real time through the PLC, the judgment is carried out through the bit 2 and the bit 3 of the state word 1 of the frequency converter, namely the high level of the bit 2 is changed into the low level, the low level of the bit 3 is changed into the high level, and a pulse edge signal is captured. When a fault occurs in the operation of the frequency converter, automatically resetting for 0.5s, and simultaneously automatically starting another normal electric vibration motor to operate at a speed of 50 hz; if the frequency converter is detected not to be out of order in operation, the starting command is waited, and the automatic operation of the electric vibration motor is avoided when the feeding is not needed. Therefore, the fault processing efficiency is greatly improved, and the production efficiency and the stability are maintained.
Drawings
FIG. 1 is a schematic structural diagram of an automatic switching control system for the electric vibration fault of the alloy after the converter provided by the invention;
FIG. 2 is a schematic control logic flow diagram of an automatic switching control system for the alloy electric vibration fault after the converter provided by the invention;
FIG. 3 is a schematic view of the monitoring operation logic of the automatic switching control system for the alloy electric vibration fault after the converter provided by the invention;
FIG. 4 is a schematic circuit structure diagram of an automatic switching control system for the electric vibration fault of the alloy after the converter provided by the invention;
fig. 5 is a schematic diagram of a connection structure of a control board port of a frequency converter provided by the present invention.
Detailed Description
The embodiment of the application solves the technical problem of poor timeliness of fault treatment of the alloy electric vibration motor in the prior art by providing the automatic switching control system for the alloy electric vibration fault behind the converter.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and examples of the present application may be combined with each other without conflict.
Referring to fig. 1, an automatic switching control system for electric vibration fault of alloy after converter, includes: WINCC monitored control system, PLC programmable controller, converter, first circuit breaker, first motor, second circuit breaker and second motor.
The WINCC monitoring system is connected with the PLC, the PLC is connected with the frequency converter, and a control panel of the frequency converter is connected with auxiliary contacts of the first circuit breaker and the second circuit breaker; the power supply end of the frequency converter is connected with the main contact of the first circuit breaker and the main contact of the second circuit breaker, the first circuit breaker is connected with the first motor, and the second circuit breaker is connected with the second motor.
The frequency converter is provided with a motor fault parameter scheme and a motor normal parameter scheme;
when the frequency converter detects that the level signal of the auxiliary contact of the first circuit breaker or the second circuit breaker changes, the motor control parameter of the frequency converter is switched to a motor fault switching scheme from a motor normal parameter scheme, meanwhile, the frequency converter sends an auxiliary contact level change signal to the PLC, and the PLC sends a motor fault alarm signal to the WINCC monitoring system.
Wherein the frequency converter detects the opening of the auxiliary contacts of the first circuit breaker or the second circuit breaker, the frequency converter immediately resets the fault, and the reset form is a pulse lasting for 0.5 s. Meanwhile, the frequency converter can transmit the fault to the PLC, and after the PLC receives the fault signal, on one hand, the PLC transmits the alarm information to WINCC to prompt that the electric vibration motor has a fault; and on the other hand, the PLC detects whether the fault occurs in the running process of the frequency converter, if so, the PLC executes a jump command, after the jump, the PLC automatically starts the other normal electric vibration motor to run at the speed of 50hz, and if not, the PLC does not jump and waits for the start command, so that the automatic running of the electric vibration motor is avoided when the feeding is not needed.
Wherein, PLC can detect the converter simultaneously and whether break down in the operation process, can gather the running state of converter through PLC and judge, and the high level of 1 bit 2 of converter state word becomes the low level and the low level of 3 bits becomes the high level promptly, catches pulse edge signal.
Furthermore, by adopting the WINCC monitoring system, a fault interlocking button is added on a picture, and when the system is normal, the button is clicked to put in fault interlocking control, so that the automatic resetting and automatic operation functions can be put in, and when the system is in fault, another automatically-operated motor is controlled to stop by clicking the button to withdraw from interlocking.
Specifically, the frequency converter in the embodiment adopts a siemens 6SE70 frequency converter; collecting auxiliary contacts of a first circuit breaker and a second circuit breaker, switching internal parameters of the frequency converter, customizing alarm information, and transmitting the alarm information to the PLC; and transmitting the contact signal to the PLC through DP communication.
The PLC acquires alarm information of the frequency converter through DP communication, transmits the alarm information to the WINCC monitoring system of the upper computer and displays the alarm information on a monitoring picture; and acquiring an auxiliary contact signal transmitted by the frequency converter through DP communication for controlling the high-speed operation of the electric vibration motor by a program.
The first motor and the second motor receive starting and stopping commands, speed control and the like of the frequency converter.
The WINCC monitoring system realizes remote visual monitoring, and an operator receives alarm information sent by the PLC through an operation interface. The WINCC monitoring system is a Siemens WINCC monitoring system.
Referring to fig. 4 and 5, the alloy electric vibration after the furnace adopts a frequency converter to control two electric vibration motors, two auxiliary contacts of two circuit breakers are connected in series and transmitted to an input terminal 5 of a control board of the frequency converter, and the selection of the group of motor parameters in the frequency converter is controlled. The normal operation is that the first group of motor parameters is the sum of rated values of 2 motors, the second group of motor parameters is the rated value of 1 motor in the case of a fault, and then after the internal parameters of the frequency converter are selected in the case of the fault, the original two motor parameters are changed into one motor parameter, so that the operation of one motor can be controlled.
Under normal conditions, because two motors are controlled to operate, if one motor has a fault, the frequency converter can report the fault, and in order to avoid the interval time of resetting in operation, the automatic resetting function under the fault state is set.
Wherein, the frequency converter detects the opening of the auxiliary contact of the first breaker or the second breaker, the frequency converter can immediately reset the fault, and the reset form is a pulse lasting for 0.5 s. Meanwhile, the frequency converter can transmit the fault to the PLC, and after the PLC receives the fault signal, on one hand, the PLC transmits the alarm information to WINCC to prompt that the electric vibration motor has a fault; and on the other hand, the PLC detects whether the fault occurs in the running process of the frequency converter, if so, the PLC executes a jump command, after the jump, the PLC automatically starts the other normal electric vibration motor to run at the speed of 50hz, and if not, the PLC does not jump and waits for the start command, so that the automatic running of the electric vibration motor is avoided when the feeding is not needed.
PLC can detect whether the converter breaks down in the operation process simultaneously, can gather the running state of converter through PLC and judge, and the low level of 1 bit 2 of converter state word becomes the low level and the low level of 3 bits becomes the high level promptly, catches pulse edge signal.
Furthermore, by adopting the WINCC monitoring system, a fault interlocking button is added on a picture, and when the system is normal, the button is clicked to put in fault interlocking control, so that the automatic resetting and automatic operation functions can be put in, and when the system is in fault, another automatically-operated motor is controlled to stop by clicking the button to withdraw from interlocking.
Referring to fig. 2 and fig. 3, in this embodiment, the automatic switching control system for the alloy electric vibration fault after the converter performs, and specifically includes the following steps:
step S1: establishing communication, establishing a hardware system platform, establishing communication among the PLC, the WINCC and the frequency converter, connecting auxiliary contacts of the circuit breaker in parallel, and inputting signals to a control board of the frequency converter;
step S2: setting parameters of the frequency converter, and starting, stopping and operating the frequency converter;
and step S3: setting parameters of a frequency converter, and setting an automatic reset function when one motor fails;
and step S4: setting parameters of a frequency converter, and setting parameters of communication between the PLC and the frequency converter;
step S5: writing a program, acquiring alarm information when one motor of the frequency converter fails, prompting that the electric vibration motor has one failure, and transmitting the failure to WINCC;
step S6: a button is added on a winc picture, and when the winc picture is normal, the button is clicked to put in fault interlocking control, so that the automatic reset and automatic operation functions can be put in when one motor fails, and when the motor fails, the button needs to be clicked to withdraw from interlocking to control the other automatically-operated motor to stop;
step S7: programming a program, detecting whether a fault occurs in the running process of the frequency converter, judging through a bit 2 and a bit 3 of a state word 1 of the frequency converter, namely changing the high level of the bit 2 into the low level and changing the low level of the bit 3 into the high level, and capturing a pulse edge signal;
step S8: writing a program, detecting that the fault is in operation in the step S7, executing a jump command by the PLC, and automatically starting another normal electric vibration motor to operate at a speed of 50hz after jumping;
step S9: writing a program, and if the step S7 detects that the material is not the target material, not skipping, waiting for a starting command, and avoiding the automatic operation of the electric vibration motor when the material is not required to be added;
step S10: and (5) programming a program, and stopping the normally running motor by withdrawing the interlocking control through the winc picture fault interlocking button motor after the jump is detected in the step S8.
The scheme provided by the embodiment can solve the problem that the furnace cannot be discharged due to one failed motor, prompt that one electric vibration motor fails in time and process in time; the abnormal motor is automatically judged, the normal motor is automatically switched in, manual operation is not needed, and the automatic control degree is improved.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the automatic switching control system of alloy electric vibration trouble behind converter that provides in the embodiment of this application, through setting up two sets of motor operation control parameters in the converter: the motor normal parameter scheme and the motor fault parameter scheme respectively correspond to the normal operation of two motors and the fault of one motor, and level signals fed back by auxiliary contacts of the first circuit breaker and the second circuit breaker are used as the basis for switching two groups of parameter schemes of the frequency converter, so that feedback control is realized; furthermore, the switching can be realized in a high-efficiency manner by feeding back signals of the auxiliary contacts of the circuit breaker; more importantly, whether the frequency converter has a fault in the running process is detected in real time through the PLC, the fault is judged through the bit 2 and the bit 3 of the status word 1 of the frequency converter, namely the high level of the bit 2 is changed into the low level, the low level of the bit 3 is changed into the high level, and a pulse edge signal is captured. When a fault occurs in the operation of the frequency converter, automatically resetting for 0.5s, and simultaneously automatically starting another normal electric vibration motor to operate at a speed of 50 hz; if the frequency converter is detected not to break down in operation, the starting command is waited, and the automatic operation of the electric vibration motor is avoided when feeding is not needed. Therefore, the fault processing efficiency is greatly improved, and the production efficiency and the stability are maintained.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. The utility model provides an automatic switch-over control system of alloy electric vibration trouble behind converter stove which characterized in that includes: the system comprises a WINCC monitoring system, a PLC programmable controller, a frequency converter, a first circuit breaker, a first motor, a second circuit breaker and a second motor;
the WINCC monitoring system is connected with the PLC, the PLC is connected with the frequency converter, and a control panel of the frequency converter is connected with an auxiliary contact of the first circuit breaker and an auxiliary contact of the second circuit breaker;
the power supply end of the frequency converter is connected with a main contact of the first circuit breaker and a main contact of the second circuit breaker, the first circuit breaker is connected with the first motor, and the second circuit breaker is connected with the second motor;
the frequency converter is provided with a motor fault parameter scheme and a motor normal parameter scheme;
when the frequency converter detects that the level signal of the auxiliary contact of the first circuit breaker or the second circuit breaker changes, the motor control parameter of the frequency converter is switched to a motor fault parameter scheme from a motor normal parameter scheme, meanwhile, the frequency converter sends an auxiliary contact level change signal to the PLC, and the PLC sends a motor fault alarm signal to the WINCC monitoring system.
2. The automatic switching control system for the electric vibration fault of the converter rear alloy according to claim 1, characterized in that: the input terminal of the control panel of the frequency converter is connected with the auxiliary contact of the first circuit breaker and the auxiliary contact of the second circuit breaker;
when the auxiliary contact of the first circuit breaker or the auxiliary contact of the second circuit breaker is disconnected, the motor control parameter scheme in the frequency converter is the motor fault parameter scheme;
when the auxiliary contacts of the first circuit breaker and the second circuit breaker are all closed, the motor control parameter scheme in the frequency converter is the normal parameter scheme of the motor;
the motor fault parameter scheme is a rated value of one motor;
when the motor parameter control scheme of the frequency converter is switched from the motor normal parameter scheme to the motor fault parameter scheme, the output of the frequency converter is changed from the original two motor parameters to one motor parameter, so that the operation mode of controlling the two motors is switched to the operation mode of controlling one motor.
3. The automatic switching control system for the electric vibration fault of the alloy behind the converter according to claim 1, characterized in that: the frequency converter is a Siemens 6SE70 frequency converter.
4. The automatic switching control system for the electric vibration fault of the alloy behind the converter according to claim 3, characterized in that: the WINCC monitoring system is a Siemens WINCC monitoring system.
5. The automatic switching control system for the alloy electric vibration fault behind the converter according to claim 1, characterized in that when the frequency converter detects the opening signal of the auxiliary contact of the first circuit breaker or the auxiliary contact of the second circuit breaker, the frequency converter immediately resets the fault with a pulse lasting 0.5 s.
6. The automatic switching control system for the electric vibration fault of the alloy behind the converter according to claim 5, wherein when the frequency converter detects an opening signal of the auxiliary contact of the first circuit breaker or the auxiliary contact of the second circuit breaker, the frequency converter transmits a fault signal to the PLC;
after the PLC receives the fault signal, on one hand, sends alarm information to the WINCC monitoring system to prompt that the electric vibration motor has a fault, and on the other hand, the PLC detects whether the fault occurs in the operation process of the frequency converter or not, if so, the PLC executes a skip command, after the skip, the PLC automatically starts another normal electric vibration motor to operate at the speed of 50hz, and if not, the PLC does not skip and waits for the start command to avoid the automatic operation of the electric vibration motor when the charging is not needed.
7. The system for automatically switching the electric vibration fault of the alloy behind the converter according to claim 6, wherein the PLC is used for detecting whether the fault occurs in the operation process of the frequency converter, and specifically comprises the following steps:
a fault exists when the high level of bit 2 goes low and the low level of bit 3 goes high as determined by bits 2 and 3 of the status word 1 of the frequency converter.
8. The automatic switching control system for the electric vibration fault of the alloy behind the converter furnace of claim 7, wherein a fault interlocking button is arranged in the WINCC monitoring system;
when the system is normal, clicking the fault interlocking button to put in fault interlocking control so as to put in automatic reset and automatic operation functions;
and when the motor fails, clicking the failure interlocking button to withdraw the interlocking to control another automatically-operated motor to stop.
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| CN201911278104.8A CN111077842B (en) | 2019-12-12 | 2019-12-12 | Automatic switching control system for alloy electric vibration fault behind converter |
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| CN112158561B (en) * | 2020-09-29 | 2022-04-01 | 国能(泉州)热电有限公司 | System and method for determining fault point of coal feeder |
| CN113189416B (en) * | 2021-04-07 | 2022-12-13 | 首钢京唐钢铁联合有限责任公司 | Method, device, system, equipment and medium for detecting high-temperature fault of frequency converter |
| CN114012583B (en) * | 2021-10-19 | 2022-11-08 | 江苏集萃华科智能装备科技有限公司 | Safe operation control method, device and system for metal grinding and polishing production line |
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| CN202334410U (en) * | 2011-11-15 | 2012-07-11 | 河南立昌科技发展有限公司 | Frequency conversion control system |
| CN202978789U (en) * | 2012-11-28 | 2013-06-05 | 中国石化集团四川维尼纶厂 | Frequency conversion speed regulation system wiring device |
| CN204310713U (en) * | 2014-10-13 | 2015-05-06 | 南京梅山冶金发展有限公司 | Bridge crane frequency conversion protection system |
| CN207124572U (en) * | 2017-08-08 | 2018-03-20 | 武汉科贝科技股份有限公司 | A kind of bi-motor automatic switching control circuit |
| CN207543015U (en) * | 2017-09-05 | 2018-06-26 | 江苏省冶金设计院有限公司 | Two desalination water pumps share frequency conversion switching control device |
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