CN107414177A - A kind of control method for preventing that flying shear miscut is cut after bar breaking down - Google Patents
A kind of control method for preventing that flying shear miscut is cut after bar breaking down Download PDFInfo
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- CN107414177A CN107414177A CN201710841171.0A CN201710841171A CN107414177A CN 107414177 A CN107414177 A CN 107414177A CN 201710841171 A CN201710841171 A CN 201710841171A CN 107414177 A CN107414177 A CN 107414177A
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- flying shear
- breaking down
- bar
- bar breaking
- instruction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D36/00—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D25/00—Machines or arrangements for shearing stock while the latter is travelling otherwise than in the direction of the cut
- B23D25/02—Flying shearing machines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The invention discloses a kind of control method for preventing that flying shear miscut is cut after bar breaking down, belong to electrical drive control system field.It is more for miscut situation present in prior art, production cost is high, the problem of plant maintenance difficulty, the invention provides a kind of control method for preventing that flying shear miscut is cut after bar breaking down, including flying shear shearing starting impulse instruction control unit after flying shear No starting instruction generation unit after bar breaking down and bar breaking down, the two units control the instruction of flying shear No starting and flying shear shearing starting impulse instruction respectively.After the two units, the miscut of flying shear after bar breaking down can be avoided, this is thus greatly increased and cuts reliability of operation.
Description
Technical field
The present invention relates to electrical drive control system field, flying shear miscut after bar breaking down is prevented more specifically to one kind
The control method cut.
Background technology
Bar generally requires carry out flying shear after going out well, in the prior art often through control milling train muzzle velocity, metal
Detector, sheared with computational length according to fixed length, but because supplied materials length is unstable, easily appearance shearing is abnormal,
Flying shear appears in the knife of miscut one and afterbody in the normal operation of rolling and shears long phenomenon often after breaking down, after Bar Rolling Line breaking down
The problems of flying shear is difficult to solve in existing technology, and failure often occurs repeatedly, and each failure not only results in
Averagely more than 30 minutes stopping production fault times and a rolled piece roll useless, but also can give flying shear and its phase after the Bar Rolling Line breaking down
Equipment belt is closed to damage.It follows that after Bar Rolling Line breaking down the problems of flying shear to production stable and antegrade, production cost with
And cost of equipment maintenance is brought greater impact.
The content of the invention
1. technical problems to be solved
More for miscut situation present in prior art, production cost is high, and the problem of plant maintenance difficulty, the present invention carries
A kind of control method for preventing that flying shear miscut is cut after bar breaking down is supplied, it can eliminate miscut, reduce production cost, bar life
Producing line is safeguarded simple.
2. technical scheme
The purpose of the present invention is achieved through the following technical solutions.
A kind of control method for preventing that flying shear miscut is cut after bar breaking down, step are as follows：
Flying shear miscut cuts flying shear No starting instruction production after control program, including bar breaking down after one kind prevents bar breaking down
Flying shear shearing starting impulse instruction control unit after raw unit and bar breaking down, respectively the instruction of control output flying shear No starting and
Flying shear shearing starting impulse instruction；
When bar breaking down unit end frame and bar intermediate mill head frames have steel, and flying shear does not exist after bar breaking down
During cataclasm state, flying shear No starting instructs after flying shear No starting instruction generation unit sends bar breaking down after bar breaking down,
Flying shear will be unable to restart after bar breaking down, thus avoid the flying shear that miscut situation occurs；
The previous frame of flying shear has steel, the latter frame to be instructed without steel and flying shear without No starting after bar breaking down
In the case of, hot metal detector is examined before the previous frame of flying shear after bar breaking down, flying shear shearing startup arteries and veins after bar breaking down
Rush instruction control unit and send flying shear shearing starting impulse instruction, flying shear starts crop operation
The previous frame of flying shear is without steel, the feelings that the latter frame has steel and flying shear instructs without No starting after bar breaking down
Under condition, hot metal detector inspection is lost before the previous frame of flying shear after bar breaking down, and flying shear shears starting impulse after bar breaking down
Instruction control unit sends flying shear shearing starting impulse instruction, and flying shear starts back-end crop operation after bar breaking down.
Further, described milling train has steel signal to judge by driving motor reality output moment of torsion, as two frame masters
Driving motor reality output moment of torsion is more than setting moment of torsion, then judges there is steel in frame.
Further, it is described to set moment of torsion as 15% Rated motor moment of torsion.
Further, flying shear No starting instruction generation unit includes after bar breaking down, including functional block FFWC01~
FFWC6, FFWC01, FFWC02 are respectively two NCM functional blocks, and FFWC01 X1 inputs connect bar blooming mill group end frame
Motor actual torque signal, X2 inputs connection motor setting torque signal, FFWC02 X1 inputs connect milling train in bar
The first gantry motor actual torque of group, X2 inputs connection bar intermediate mill head gantry motor setting moments of torsion, two NCM functional blocks
Output end QU connects AND functional blocks FFWC06 two input ports respectively, FFWC01 output ends QU also with flying shear after bar breaking down
The input port connection of the AND functional blocks FFWC12 in starting impulse instruction control unit is sheared, FFWC02 output ends QU is also
It is connected with an input port of the AND functional blocks FFWC10 in flying shear shearing starting impulse instruction control unit after bar breaking down,
FFWC01 output ends QL and FFWC10 input port connection, FFWC02 output ends QL and FFWC12 an input port connect
Connect, two inputs of OR functional blocks FFWC03 connect the automatic cataclasm instruction of flying shear and flying shear cataclasm instruction manually, output end respectively
RSR functional blocks FFWC04 S ends input port is connected, FFWC04 R ends input port connects the cataclasm halt instruction of flying shear, and FFWC04 is defeated
Go out after signal is handled by NOT functional blocks FFWC05 to be sent into FFWC06 1 input port, FFWC06 another input port
Input high level signal, FFWC06 four input signals export flying shear No starting command signal after being handled by FFWC06.
Further, after bar breaking down flying shear shearing starting impulse instruction control unit include functional block FFWC07~
Thermometal before flying shear frame after FFWC14, PDF functional block FFWC07 connect bar breaking down with PDE functional blocks FFWC11 I ports
Detector signal, T-port Connection Time signal, FFWC07 outputs after NOT functional blocks FFWC08 processing by entering FFWC10's
One input port, FFWC11 output pass through NOT functions into a FFWC12 input port, flying shear No starting command signal
A FFWC10 input port and a FFWC12 input port, FFWC10 and FFWC12 output letters are sent into after block FFWC09 processing
Number it is respectively fed to OR functional blocks FFWC13, FFWC13 delivery outlet and is sent into front and rear along after set-up function block FFWC14, FFWC14 passes through
QP output flying shear shearing starting impulse instructions.
3. beneficial effect
Compared to prior art, the advantage of the invention is that：
(1) this programme has steel signal by detection, judges that corresponding steel enter situation, passes through logic control, effectively control
The shearing step that system expense subtracts, after this prevents the control method that flying shear miscut is cut after bar breaking down from coming into operation, is thoroughly avoided
Flying shear miscut one knife and the problem of long afterbody shearing in the normal operation of rolling, practical effect is fine；
(2) this programme combination flying shear control system, by entirety PLC carry out information transfer, effective detection motor model,
Judge the entrance of steel, prevent in the extreme circumstances, when generation if any steam, outside detector can not effectively detect steel
The entrance of material；Prevent that the position that steel reach can not be judged, control shearing opportunity, avoid miscut.
Brief description of the drawings
Fig. 1 is the overall system architecture schematic diagram of the present invention；
Fig. 2 is the control program flow chart of invention.
Embodiment
With reference to Figure of description and specific embodiment, the present invention is described in detail.
Embodiment 1
As shown in figure 1, flying shear control system includes, milling train control PLC (AC450), flying shear shearing location control plate
(DSDP140), flying shear transmission interface and logic control panel (APC), flying shear DC Transmission control device (DCV700), flying shear direct current
Drive motor, the DC Transmission motor parameter of the present embodiment be, rated power 335KW, specified armature voltage 600V, specified
850 revs/min of rotating speed in addition to flying shear motor speed detection encoder, flying shear reductor, flying shear cut disk and flying shear blade up and down
Detect encoder in position.Flying shear shearing location control plate and technology controlling and process plate are inserted in the machine of milling train control PLC after the bar breaking down
In case, it is connected by backboard with milling train control PLC, to realize the transmission of data and signal between the two, and passes through two
Rigid line is driven interface with flying shear and logic control panel is connected, the flying shear motor speed that output flying shear shearing location control plate provides
A reference value is spent, flying shear DC Transmission control device will control the actual speed of flying shear motor according to the electromotor velocity a reference value
Degree.Flying shear milling train control PLC is connected by fieldbus AF100 with flying shear DC Transmission control device after the bar breaking down,
To obtain the information such as the actual speed of flying shear drive motor, actual current and actual torque.In process of production, before flying shear
Breaking down unit end frame its export bar rolling speed (i.e. speed of the rolled piece through flying shear), the manual cut command of flying shear and flying shear
Cataclasm order etc. is sent to flying shear shearing location control plate by milling train control PLC, and the enabling signal of flying shear crop and back-end crop is (i.e.
Hot metal detector HMD6 signals before the frame of breaking down unit end) then it is conveyed directly to flying shear shearing location control plate.Flying shear motor
Velocity measuring encoder, flying shear motor signal is detected, and transmit information to flying shear DC Transmission control device, flying shear blade
Encoder is detected in position, detects flying shear reductor signal, and transmits signals to flying shear shearing location control plate.
Also include process data collection and analytical equipment, milling train control PLC information enters process data collection and analysis fills
Put and stored and analyzed.PLC information and data is effectively collected, completes the optimization to flying shear program.
The problems of the Bar Rolling Line flying shear entirely due to caused by existing control program existing defects, so, in order to
The generation of the Bar Rolling Line flying shear above mentioned problem is prevented, we are designed in milling train control PLC in the upper level control system of flying shear
A kind of control method for preventing that flying shear miscut is cut after bar breaking down, under its control program structure chart shown in Fig. 2.
This prevents after bar breaking down that flying shear miscut cuts control program and is made up of two units, i.e. functional block FFWC01~
FFWC06 forms flying shear No starting instruction generation unit after bar breaking down；FFWC07~FFWC14 forms flying shear after bar breaking down
Shear starting impulse instruction control unit.
In fig. 2, wherein FFWC01, FFWC02 are NCM functional blocks, and FFWC03, FFWC13 are OR functional blocks, and FFWC04 is
RSR functional blocks, FFWC05, FFWC08, FFWC09 are NOT functional blocks, and FFWC06, FFWC10, FFWC12 are AND functional blocks；
FFWC07 is PDF functional blocks, and FFWC11 is PDE functional blocks, and for FFWC14 to be front and rear along set-up function block, NCM is " numeric ratio compared with "
Functional block, as X1 ＞ X2, QU is ' 1 ', and as X1=X2, QE is ' 1 ', and as X1 ＜ X2, QL is ' 1 '；RSR is " reset terminal R
Preferential rest-set flip-flop " functional block, when it is ' 0 ' that S, which is ' 1 ', R, Q is that ' 1 ', QN is ' 0 ', and when it is ' 1 ' that S, which is ' 1 ', R, Q is
' 0 ', QN are ' 1 ', and when it is ' 0 ' that S, which is ' 0 ', R, Q and QN keep ortho states, and when it is ' 1 ' that S, which is ' 0 ', R, Q is that ' 0 ' QN is ' 1 '；
PDE is " forward position delay " functional block；PDF is " rear along delay " functional block；OR is OR-gate；AND is AND gate；NOT is " non-"
Door.ETE is " front and rear along setting " functional block, and when input I becomes ' 1 ' by ' 0 ', it is 1 cycle period that QP ends, which only export length,
Direct impulse, QP ends remain ' 0 ' state under remaining state.When input I becomes ' 0 ' by ' 1 ', QN ends only export length and are
The direct impulse of 1 cycle period, QN ends remain ' 0 ' state under remaining state；
Flying shear No starting instruction generation unit includes after bar breaking down, including functional block FFWC01~FFWC6,
FFWC01, FFWC02 are respectively two NCM functional blocks, and FFWC01 X1 inputs connection bar blooming mill group end gantry motor is real
Border torque signal, X2 inputs connect 15% signal of Rated motor moment of torsion, and 15% ratio herein is to enter according to the actual requirements
Row setting, different ratios, FFWC02 X1 inputs connection bar intermediate mill head frames can be adjusted in the state of different
Motor actual torque, the 15% of X2 inputs connection bar intermediate mill head gantry motor nominal torques, two NCM functional blocks are defeated
Go out to hold QU to connect AND functional blocks FFWC06 two input ports respectively, FFWC01 output ends QU is also cut with flying shear after bar breaking down
Cut the AND functional blocks FFWC12 in starting impulse instruction control unit an input port connection, FFWC02 output ends QU also with
The input port connection of AND functional blocks FFWC10 after bar breaking down in flying shear shearing starting impulse instruction control unit,
FFWC01 output ends QL and FFWC10 input port connection, FFWC02 output ends QL and FFWC12 an input port connect
Connect, two inputs of OR functional blocks FFWC03 connect the automatic cataclasm instruction of flying shear and flying shear cataclasm instruction manually, output end respectively
RSR functional blocks FFWC04 S ends input port is connected, FFWC04 R ends input port connects the cataclasm halt instruction of flying shear, and FFWC04 is defeated
Go out after signal is handled by NOT functional blocks FFWC05 to be sent into FFWC06 1 input port, FFWC06 another input port
Input high level signal, FFWC06 four input signals export flying shear No starting command signal after being handled by FFWC06.
Flying shear shearing starting impulse instruction control unit includes functional block FFWC07~FFWC14, PDF work(after bar breaking down
Hot metal detector before the previous frame of flying shear after energy block FFWC07 connects bar breaking down with PDE functional blocks FFWC11 I ports
Signal, T-port Connection Time signal, FFWC07 outputs pass through defeated into one of FFWC10 after NOT functional blocks FFWC08 processing
Entrance, FFWC11 output pass through NOT functional blocks into a FFWC12 input port, flying shear No starting command signal
A FFWC10 input port and a FFWC12 input port, FFWC10 and FFWC12 output signals are sent into after FFWC09 processing
It is respectively fed to before and after OR functional blocks FFWC13, FFWC13 delivery outlet are sent into along after set-up function block FFWC14, FFWC14 passes through QP
Export flying shear shearing starting impulse instruction.
In real work, generation unit is instructed for flying shear No starting after bar breaking down, when bar breaking down unit end
Frame (abbreviation flying shear frame) and bar intermediate mill head frames have steel, and (i.e. two frame main driving motor reality output moments of torsion are equal
More than 15% Rated motor moment of torsion), as have a steel signal, and after bar breaking down flying shear not in cataclasm state (i.e. control list
Functional block FFWC05 output ends Q is ' 1 ' state in member) when, functional block FFWC06 output ends Q is ' 1 ' in the control unit, so,
The control unit sends the instruction of flying shear No starting, and flying shear does not start, the situation of miscut will not occur, thus flying shear is located all the time
Released in dead ship condition until the flying shear No starting instructs.
Starting impulse instruction control unit, the previous frame of flying shear after bar breaking down are sheared for flying shear after bar breaking down
Have in the case that steel, the latter frame instruct without steel and flying shear without No starting, the previous frame of flying shear after bar breaking down
When preceding hot metal detector HMD6 examines (i.e. HMD6 output states are changed into ' 1 ' from ' 0 ') and continues more than 1 second, the control unit
Middle functional block FFWC12 and FFWC13 output ends Q will become ' 1 ', so, functional block FFWC14 output ends in the control unit by ' 0 '
QP will produce ' 1 ' pulse of a cycle period, flying shear is started crop operation.
And the previous frame of flying shear has steel without steel, the latter frame after bar breaking down and flying shear instructs without No starting
In the case of, (i.e. HMD6 output states are by ' 1 ' for hot metal detector HMD6 inspections mistake before the previous frame of flying shear after bar breaking down
It is changed into ' 0 ') and when continuing more than 1 second, functional block FFWC10 and FFWC13 output end Q will become ' 1 ' by ' 0 ' in the control unit,
So, functional block FFWC14 output ends QP will produce ' 1 ' pulse of a cycle period in the control unit, thus open flying shear
Dynamic back-end crop operation.It follows that in the case of having steel in frame before and after flying shear, flying shear shears starting impulse after the bar breaking down
Instruction control unit can avoid miscut of the flying shear in the normal operation of rolling from cutting by forbidding flying shear enabled instruction.
This programme the problems of for Bar Rolling Line flying shear, can in the case of steel based on having in frame before and after flying shear
Avoid flying shear miscut from cutting by forbidding flying shear enabled instruction, have devised a kind of control for preventing that flying shear miscut is cut after bar breaking down
Processing procedure sequence, after this prevents the control method that flying shear miscut is cut after bar breaking down from coming into operation, thoroughly avoid the flying shear and exist
The knife of miscut one and afterbody shear the problem of long in the normal operation of rolling, and practical effect is fine.
Schematically the invention and embodiments thereof are described above, this describe it is no restricted, not
In the case of the spirit or essential characteristics of the present invention, the present invention can be realized in other specific forms.Institute in accompanying drawing
What is shown is also one of embodiment of the invention, and actual structure is not limited thereto, any attached in claim
Icon note should not limit involved claim.So if one of ordinary skill in the art is enlightened by it, do not departing from
In the case of this creation objective, the frame mode similar to the technical scheme and embodiment are designed without creativeness, all should
Belong to the protection domain of this patent.In addition, the word of " comprising " one is not excluded for other elements or step, "one" word before element
It is not excluded for including " multiple " element.The multiple element stated in claim to a product can also by an element by software or
Person hardware is realized.The first, the second grade word is used for representing title, and is not offered as any specific order.
Claims (5)
1. a kind of control method for preventing that flying shear miscut is cut after bar breaking down, step are as follows：
Flying shear miscut cuts flying shear No starting instruction generation list after control program, including bar breaking down after one kind prevents bar breaking down
Flying shear shearing starting impulse instruction control unit after member and bar breaking down, controls the instruction of flying shear No starting and flying shear shearing respectively
Starting impulse instructs；
When bar breaking down unit end frame and bar intermediate mill head frames have a steel, and after bar breaking down flying shear not cataclasm
During state, flying shear No starting instructs after flying shear No starting instruction generation unit sends bar breaking down after bar breaking down, bar
Flying shear will be unable to restart after breaking down；
The previous frame of flying shear has steel, the latter frame without flying shear after steel and bar breaking down without No starting after bar breaking down
In the case of instruction, hot metal detector is examined before the previous frame of flying shear after bar breaking down, and flying shear is sheared after bar breaking down
Starting impulse instruction control unit sends flying shear shearing starting impulse instruction, and flying shear starts crop operation after bar breaking down；
The previous frame of flying shear is without steel, the situation that the latter frame has steel and flying shear instructs without No starting after bar breaking down
Under, hot metal detector inspection is lost before the previous frame of flying shear after bar breaking down, and flying shear shearing starting impulse refers to after bar breaking down
Control unit is made to send flying shear shearing starting impulse instruction, flying shear starts back-end crop operation after bar breaking down.
2. a kind of control method for preventing that flying shear miscut is cut after bar breaking down according to claim 1, step are as follows：It is described
Milling train have steel signal by mill drive motor reality output moment of torsion judge, when frame main driving motor reality output moment of torsion is big
In setting moment of torsion, then judge there is steel in frame.
3. a kind of control method for preventing that flying shear miscut is cut after bar breaking down according to claim 2, step are as follows：It is described
Set moment of torsion as 15% Rated motor moment of torsion.
A kind of 4. control method for preventing that flying shear miscut is cut after bar breaking down according to claim 1, it is characterised in that：Rod
Flying shear No starting instruction generation unit is respectively two including functional block FFWC01~FFWC6, FFWC01, FFWC02 after material breaking down
Individual NCM functional blocks, FFWC01 X1 inputs connection bar blooming mill group end gantry motor actual torque signal, X2 inputs connect
Connect motor setting torque signal, FFWC02 X1 inputs connection bar intermediate mill head gantry motor actual torques, X2 inputs
End connection bar intermediate mill head gantry motor setting moments of torsion, two NCM functional block output ends QU connect AND functional blocks respectively
FFWC06 two input ports, FFWC01 output ends QU are also sheared in starting impulse instruction control unit with flying shear after bar breaking down
AND functional blocks FFWC12 an input port connection, FFWC02 output ends QU also with after bar breaking down flying shear shearing start arteries and veins
The AND functional blocks FFWC10 rushed in instruction control unit input port connection, the one of FFWC01 output ends QL and FFWC10
Individual input port connection, FFWC02 output ends QL and FFWC12 input port connection, two inputs of OR functional blocks FFWC03
The automatic cataclasm instruction of flying shear and flying shear cataclasm instruction manually, output end connection RSR functional blocks FFWC04 S ends input are connected respectively
Mouthful, the FFWC04 R ends input port connection cataclasm halt instruction of flying shear, FFWC04 output signals are entered by NOT functional blocks FFWC05
Feeding FFWC06 1 input port after row processing, FFWC06 another input port input high level signal, four of FFWC06
Input signal exports flying shear No starting command signal after being handled by FFWC06.
A kind of 5. control system for preventing that flying shear miscut is cut after bar breaking down according to claim 1, it is characterised in that：Rod
Flying shear shearing starting impulse instruction control unit includes functional block FFWC07~FFWC14, PDF functional block FFWC07 after material breaking down
Hot metal detector signal before flying shear frame after connecting bar breaking down with PDE functional blocks FFWC11 I ports, when T-port connects
Between signal, FFWC07 output by NOT functional blocks FFWC08 processing after enter FFWC10 an input port, FFWC11 output
Into a FFWC12 input port, flying shear No starting command signal is sent into after being handled by NOT functional blocks FFWC09
A FFWC10 input port and a FFWC12 input port, FFWC10 and FFWC12 output signals are respectively fed to OR functional blocks
FFWC13, FFWC13 delivery outlet are sent into front and rear along after set-up function block FFWC14, and FFWC14, which passes through QP and exports flying shear shearing, to be started
Pulse command.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710841171.0A CN107414177B (en) | 2017-09-18 | 2017-09-18 | It is a kind of to prevent the control method that flying shear miscut is cut after bar breaking down |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710841171.0A CN107414177B (en) | 2017-09-18 | 2017-09-18 | It is a kind of to prevent the control method that flying shear miscut is cut after bar breaking down |
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| CN107414177B CN107414177B (en) | 2019-11-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421179A (en) * | 2020-03-30 | 2020-07-17 | 马鞍山钢铁股份有限公司 | Rod cold shearing fixed-length shearing control system |
| CN111681227A (en) * | 2020-06-09 | 2020-09-18 | 中冶赛迪重庆信息技术有限公司 | Method and system for judging abnormality of flying shear machine, electronic device and medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421179A (en) * | 2020-03-30 | 2020-07-17 | 马鞍山钢铁股份有限公司 | Rod cold shearing fixed-length shearing control system |
| CN111421179B (en) * | 2020-03-30 | 2021-04-09 | 马鞍山钢铁股份有限公司 | Rod cold shearing fixed-length shearing control system |
| CN111681227A (en) * | 2020-06-09 | 2020-09-18 | 中冶赛迪重庆信息技术有限公司 | Method and system for judging abnormality of flying shear machine, electronic device and medium |
| CN111681227B (en) * | 2020-06-09 | 2023-03-14 | 中冶赛迪信息技术(重庆)有限公司 | Method and system for judging abnormality of flying shear machine, electronic device and medium |
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| Publication number | Publication date |
|---|---|
| CN107414177B (en) | 2019-11-08 |
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