CN110161961A - A kind of zinc-plated electric furnace heating control system and method based on PLC - Google Patents
A kind of zinc-plated electric furnace heating control system and method based on PLC Download PDFInfo
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- CN110161961A CN110161961A CN201910514983.3A CN201910514983A CN110161961A CN 110161961 A CN110161961 A CN 110161961A CN 201910514983 A CN201910514983 A CN 201910514983A CN 110161961 A CN110161961 A CN 110161961A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1103—Special, intelligent I-O processor, also plc can only access via processor
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention proposes a kind of zinc-plated electric furnace heating control system based on PLC, including former control subsystem, former control subsystem includes: the first thermocouple, temperature controller, signal adapter, power controller, further include: the second thermocouple, multi-path temperature-control instrument, PLC, intermediate relay, several second thermocouples are connect with multi-path temperature-control instrument, the signal output end of multi-path temperature-control instrument and the signal input part of PLC connect, and the output end of PLC passes through intermediate relay connection signal converter and power controller；Multi-path temperature-control instrument includes at least input terminal all the way and is used to detect zinc liquid temperature in zinc-plated electric furnace, including at least six road input terminals for detecting fire box temperature in zinc-plated electric furnace, the invention also provides a kind of zinc-plated electric furnace method for heating and controlling based on PLC, it avoids because when single zinc liquid temperature detection device breaks down, it cannot achieve overtemperature alarm, improve and resist the ability because chance failure leads to risk.
Description
Technical field
The present invention relates to zinc-plated electric furnace computer heating control fields, more particularly, to a kind of zinc-plated electric heating based on PLC
Stove heating control system and method.
Background technique
Currently, what domestic steel tower galvanizing by dipping industry electric-heating control system generallyd use is that Nanning is converged peace electrical equipment and had
The electric furnace heating control system that digital three-phase thyristor power controller is used based on single-chip microcontroller of limit company.And Nanning
Hui An electrical equipment Co., Ltd is heated based on single-chip microcontroller using the electric furnace of digital three-phase thyristor power controller
Control system actual motion and it is unattended in the case where, Zeng Fasheng heating system detects dedicated compensating wire because of zinc liquid temperature
It loosens short circuit and causes to detect temperature at 370 degrees Celsius, practical zinc liquid temperature has been up to 630 degrees Celsius, and therefore heating system is held
The equipment fault that continuous heating generates a large amount of cadmias and zinc pot service life is made to be badly damaged, and cause larger economic loss.
A large amount of cadmias are generated for heating system continuous heating and the equipment fault that makes zinc pot service life be badly damaged
Reason is researched and analysed, and immediate cause is compensation lead of thermocouple because loosening short circuit caused by high temperature；Essential reason is heating system
Insufficient to there is chance failure evaluation of risk when system design, Redundancy Design is inadequate, i.e. temperature upper limit protection only relies on a set of zinc liquid
Temperature-detecting device control cannot achieve temperature upper limit and alarm in the event of its failure, is unfavorable for improving and resist because of unexpected event
Barrier leads to the ability of risk.
For current common problem, mainly by being artificially monitored, so as to chance failure occurs
When can find the problem in time, lack effective technology means solved.
Summary of the invention
The invention proposes a kind of zinc-plated electric furnace heating control system based on PLC solves because of single zinc liquid
There is the problem that chance failure causes the ability for resisting risk not high in temperature-detecting device.
First aspect present invention provides a kind of zinc-plated electric furnace heating control system based on PLC, including former control
Subsystem, the original control subsystem includes: the first thermocouple, temperature controller, signal adapter, power controller, and described first
The connection of the input terminal of thermocouple and temperature controller, the input terminal of the temperature controller are used to detect zinc liquid temperature in zinc-plated electric furnace,
The output end of the temperature controller is used to control the heating signal of signal adapter output power device, further includes: the second thermoelectricity
Idol, multi-path temperature-control instrument, PLC, intermediate relay, several described second thermocouples are connect with multi-path temperature-control instrument, the multichannel temperature
The signal input part of the signal output end and PLC of controlling instrument connects, the active line of the output end connection intermediate relay of the PLC
Circle, the heating signal output end of two pairs of normally-closed contact input terminal connection signal converters of intermediate relay, intermediate relay two
Power controller is connect in succession to normally-closed contact output end；Wherein it is zinc-plated for detecting to include at least input terminal all the way for multi-path temperature-control instrument
Zinc liquid temperature in electric furnace includes at least six road input terminals for detecting fire box temperature in zinc-plated electric furnace.
With reference to first aspect, in a first possible implementation of that first aspect, the free end of first thermocouple
Pass through compensating wire and multichannel by the free end of the connection of the input terminal of compensating wire and temperature controller and/or second thermocouple
The input terminal of temperature controller connects.
It with reference to first aspect, in a second possible implementation of that first aspect, further include remote terminal, the multichannel
Temperature controller further includes GPRS module, and the GPRS module and the remote terminal communicate to connect.
With reference to first aspect, in first aspect in the third possible implementation, the signal of the multi-path temperature-control instrument is defeated
Further include 7 road multi-path temperature-control instrument temperature upper limit alarm switches at least in parallel between outlet and the signal input part of the PLC, uses
It is more than set temperature upper limit value alarm in detecting zinc-plated electric heating in-furnace temperature；And 7 road multi-path temperature-control instrument at least in parallel
Lower limit starts switch, starting heating when for detecting zinc-plated electric heating in-furnace temperature lower than set temperature lower limit value.
Further, the signal input part of the PLC further includes reset switch, and the reset switch is for working as computer heating control
System temperature upper limit alarm stops after heating or when certain temperature upper limit alarm signal exception individually alarm all the way, after confirming failure
Realize that zinc-plated electric furnace reheats by reset switch.
Second aspect of the present invention provides a kind of zinc-plated electric furnace method for heating and controlling based on PLC, and the method is
It is realized based on the zinc-plated electric furnace heating control system described in first aspect present invention based on PLC, comprising:
PLC is powered on, and at least seven counter general reset (clearing) in PLC；
At least seven counters in PLC carry out effective input signal of alarming per temperature upper limit all the way of multi-path temperature-control instrument
Corresponding counts, and sum at least seven counters；
When PLC is more than or equal to 3 to the numerical value that at least seven counters are summed, PLC output relay is connected, intermediate
Relay obtains electric, the heating signal of the power controller of shutoff signal converter output.
In conjunction with second aspect, in second aspect in the first possible implementation, further includes:
After PLC is powered on, and at least seven data register general reset (clearing) in PLC；
At least seven data registers in PLC start effective input signal per lowest temperature all the way to multi-path temperature-control instrument
Respective stored is carried out, and is summed at least seven data registers；
When PLC is more than or equal to 4 to the numerical value that at least seven data registers are summed, PLC output relay is disconnected,
Intermediate relay power loss resets, and connects the heating signal of the power controller of signal adapter output.
Further, the zinc-plated electric furnace method for heating and controlling based on PLC further include:
When PLC is more than or equal to 4 to the numerical value that at least seven data registers are summed, PLC is all counted to internal
Device and total data register carry out general reset (clearing) respectively.
In conjunction with second aspect, in second of second aspect possible implementation, when the PLC output relay is connected
It is correspondingly connected with the first internal relay of PLC, the PLC output relay is correspondingly connected with the second internal relay of PLC when disconnecting.
The technical solution adopted by the present invention includes following technical effect:
1, the invention avoids because the control of single zinc liquid temperature detection device in the event of its failure, cannot achieve temperature
The case where upper limit alarm, and controlled by PLC, control is more comprehensively various, improves resistance because chance failure causes
The ability of risk.
2, present invention utilizes the measurements of six tunnel fire box temperatures, form fire box temperature and measure the inspection complementary with zinc liquid temperature measurement
Examining system, many-sided multi-angle are monitored zinc-plated electric furnace heating control system.
3, the present invention can may be implemented to add zinc-plated electric furnace by the communication connection of GPRS module and remote terminal
The long-range monitoring and control of thermal control system, realize no worker monitor, have saved human cost.
4, the present invention is by setting reset switch, after temperature control system temperature upper limit, which is alarmed, stops heating or when certain is warm all the way
When degree upper limit alarm abnormal signal is individually alarmed, realize that zinc-plated electric furnace reheats by reset switch after confirmation failure,
It avoids and is reheated in such a way that PLC is re-powered, to simplify workflow.
5, when PLC is more than or equal to 3 to the numerical value that at least seven counters are summed, PLC output relay is connected, in
Between relay obtain it is electric, shutoff signal converter output power controller heating signal；When PLC is at least seven data registers
The numerical value that device is summed is disconnected more than or equal to 4, PLC output relay, and intermediate relay power loss resets, and connects signal adapter
The heating signal of the power controller of output；In at least seven tunnels multichannel simultaneously break down probability it is smaller, greatly solve because
Lead to not the case where realizing temperature upper limit alarm for Redundancy Design deficiency, improves resistance because chance failure leads to risk
Ability.
6, it is correspondingly connected with the first internal relay of PLC when heretofore described PLC output relay is connected, the PLC is defeated
It is correspondingly connected with the second internal relay of PLC when relay disconnects out, i.e. temperature upper limit upper limit alarm relay is opened with lowest temperature
Motor type relay independently works, and avoids temperature upper limit upper limit alarm and lowest temperature from starting and shares a relay, causes temperature
It spends upper limit upper limit alarm and lowest temperature starting work is chaotic.
General description and following detailed description more than it should be understood that be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
Illustrate the embodiment of the present invention or technical solution in the prior art to become apparent from, it below will be to embodiment or existing
Attached drawing needed in technical description is briefly described, it is clear that, for those of ordinary skills,
Under the premise of not making the creative labor, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of embodiment one in the present invention program；
The wiring schematic diagram that Fig. 2 is PLC in embodiment one in the present invention program；
Fig. 3 is connection schematic diagram between one signal adapter of embodiment and different capacity controller in the present invention program；
Fig. 4 is the control process schematic diagram of the former control subsystem of embodiment one in the present invention program；
Fig. 5 is two structural schematic diagram of embodiment in the present invention program；
Fig. 6 is three method flow schematic diagram of embodiment in the present invention program；
Fig. 7 is example IV method flow schematic diagram in the present invention program；
Fig. 8 is five method flow schematic diagram of embodiment in the present invention program.
Specific embodiment
In order to clarify the technical characteristics of the invention, below by specific embodiment, and its attached drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
Embodiment one
For convenience of description, the embodiment of the present invention is by taking seven tunnels as an example, i.e., multi-path temperature-control instrument is including input terminal all the way for detecting
Zinc liquid temperature in zinc-plated electric furnace, including six road input terminals are for detecting fire box temperature, i.e., the second heat in zinc-plated electric furnace
Galvanic couple quantity is seven, and multi-path temperature-control instrument selects the multi-path temperature-control instrument of at least seven paths；As shown in Figure 1, the present invention provides
A kind of zinc-plated electric furnace heating control system based on PLC, former control subsystem 11 include: the first thermocouple 111, temperature controller
112, signal adapter 113, power controller 114, the first thermocouple 111 are connect with the input terminal of temperature controller 112, temperature controller
112 input terminal is for detecting zinc liquid temperature in zinc-plated electric furnace, and the output end of temperature controller 112 is for controlling signal adapter
The heating signal of 113 output power devices 114, power controller 114 are also wrapped for heating to zinc-plated electric furnace
It includes: the second thermocouple 14, multi-path temperature-control instrument 15, PLC16, intermediate relay 17, seven the second thermocouples 14 and multi-path temperature-control instrument
15 connections, the signal output end of multi-path temperature-control instrument 15 and the signal input part of PLC16 connect, and the output end of PLC16 connects intermediate
The actuating coil of relay 17, the heating letter of two pairs of normally-closed contact input terminal connection signal converters 113 of intermediate relay 17
Number output end, 17 two pairs of normally-closed contact output ends of intermediate relay connect power controller 114 in succession；Wherein multi-path temperature-control instrument 15 wraps
It includes input terminal all the way and is used to detect zinc liquid temperature in zinc-plated electric furnace, including six road input terminals for examining in zinc-plated electric furnace
Survey fire box temperature.
The free end of second thermocouple 14 is connect by compensating wire with the input terminal of multi-path temperature-control instrument 15.In needle of the present invention
Second thermocouple 14 uses WRNK-331 type flexible armoring thermocouple, and length is customized to 4000mm, diameter: 6mm, the second thermocouple
14 length reach free end junction that 4 meters ensure compensating wire and the second thermocouple 14 far from zinc pot heating zone, so that second
The temperature of 14 free end of thermocouple and compensating wire junction is no more than 100 DEG C, to effectively prevent the second thermocouple 14 and mend
Repay failure of the connection of conducting wire because loosening short circuit caused by high temperature；First thermocouple, 111 free end can also by compensating wire with
The input terminal of temperature controller 112 connects, and temperature controller refers to single channel temperature controller in the present invention, and the first thermocouple 111 also uses in the present invention
WRNK-331 type flexible armoring thermocouple, length are customized to 4000mm, diameter: 6mm, and 111 length of the first thermocouple reaches 4 meters really
The free end junction of compensating wire and the first thermocouple 111 is protected far from zinc pot heating zone, so that 111 free end of the first thermocouple
Be no more than 100 DEG C with the temperature of compensating wire junction, thus effectively prevent the connection of the first thermocouple 111 and compensating wire because
High temperature causes to loosen the failure of short circuit.
Armoured thermocouple has many advantages, such as that flexible, high pressure resistant, thermal response time is short and sturdy and durable, and main feature is exactly
Temperature-measuring range is wide, and performance is more stable, while structure is simple, and dynamic response is good, more can teletransmission 4-20mA electric signal, convenient for from
Dynamic control and centralized control.
Since the material of armoured thermocouple is generally all relatively valuable (when especially with noble metal), and temperature measuring point is to instrument
Distance it is all far, in order to save armored thermocouple material, reduce cost, generally use compensating wire the cold of armoured thermocouple
End (free end) extends in the more stable control room of temperature, is connected on temperature controller instrument terminals.Using armouring thermoelectricity
It must be noted that model matches when even compensating wire, polarity is unable to wrong, and the temperature of compensating wire and armoured thermocouple connecting pin is not
It can exceed that 100 DEG C.
Armoured thermocouple is capable of measuring high temperature, and performance is stablized, it is accurate and reliable, structure is simple, it is easy to maintain, convenient for the remote of signal
Pass and realize multiple spot handover measurement.
It can be according to the actual situation horizontal cuboid in conjunction with electric furnace, for detecting furnace in technical solution of the present invention
Be specifically when six the second thermocouples of tunnel 14 connection of bore temperature: six the second thermocouples of tunnel 14 are adsorbed on inside electric furnace outside zinc pot
Side, and insulated heat measure is set.By six the second thermocouples of tunnel 14 at the 1/2 of zinc-plated electric furnace zinc pot outer lateral side height
Around 6 the second thermocouples of tunnel 14 of setting, wherein the second thermocouple of two-way 14 is set to two sides in left and right on the outside of electric furnace zinc pot
Face (area is smaller), in addition four tunnels are symmetrically disposed on former and later two sides (area is larger) on the outside of electric furnace zinc pot, i.e. front side
Two-way is arranged in face, and two-way is arranged in the symmetrically the same position in trailing flank；It can also be in zinc-plated electric furnace zinc pot outer lateral side height
1/4 on be arranged the second thermocouple of two-way 14, wherein being set to the 1/4 of zinc-plated electric furnace zinc pot outer lateral side height all the way
In addition the right side (or left side) at place is set to the front side at the 1/4 of zinc-plated electric furnace zinc pot outer lateral side height all the way
Face (or trailing flank)；The second thermocouple of two-way 14 is set at the 2/4 of zinc-plated electric furnace zinc pot outer lateral side height, wherein one
Road is set to the right side (or left side) at the 2/4 of zinc-plated electric furnace zinc pot outer lateral side height, is in addition set to all the way
Leading flank (or trailing flank) at the 2/4 of zinc-plated electric furnace zinc pot outer lateral side height；Side on the outside of zinc-plated electric furnace zinc pot
The second thermocouple of two-way 14 is set at the 3/4 of face height, wherein it is high to be set to zinc-plated electric furnace zinc pot outer lateral side all the way
Right side (or left side) at the 3/4 of degree, is in addition set to all the way at the 3/4 of zinc-plated electric furnace zinc pot outer lateral side height
Leading flank (or trailing flank)；Fire box temperature can be more comprehensively measured in this way, avoided single height or single position from being arranged and made
It is detected at fire box temperature not comprehensive enough.
As shown in Fig. 2 and upper table, also wrapped between the signal output end of multi-path temperature-control instrument 15 and the signal input part of PLC16
Include seven road multi-path temperature-control instrument lowest temperatures of seven road multi-path temperature-control instrument temperature upper limit (overtemperature) alarm switches and parallel connection in parallel
It starts switch.That is first via multi-path temperature-control instrument temperature upper limit alarm switch S11, the alarm of the second road multi-path temperature-control instrument temperature upper limit are opened
Close S21, third road multi-path temperature-control instrument temperature upper limit alarm switch S31, the 4th road multi-path temperature-control instrument temperature upper limit alarm switch
S41, the 5th road multi-path temperature-control instrument temperature upper limit alarm switch S51, the 6th road multi-path temperature-control instrument temperature upper limit alarm switch S61,
7th road multi-path temperature-control instrument temperature upper limit alarm switch S71；First via multi-path temperature-control instrument lowest temperature starts switch S12, and second
Road multi-path temperature-control instrument lowest temperature starts switch S22, and third road multi-path temperature-control instrument lowest temperature starts switch S32, and the 4th tunnel is more
Road temperature controller lowest temperature starts switch S42, and the 5th road multi-path temperature-control instrument lowest temperature starts switch S52, the 6th tunnel multichannel temperature
Control instrument lowest temperature starts switch S62, and the 7th road multi-path temperature-control instrument lowest temperature starts switch S72；The wherein embodiment of the present invention
Middle multi-path temperature-control instrument uses the SH700 type multi-path temperature-control instrument of the pavilion Shen Hua science and technology, and the connection of seven the second thermocouples of tunnel, 14 input terminal is more
Road temperature controller 15 can be respectively seen as seven single channel temperature controllers, and multi-path temperature-control instrument 15 is double relay output (temperature upper limit report
Alert relay and lowest temperature starting relay work independently): all the way for detecting zinc-plated electric furnace in multi-path temperature-control instrument 15
The temperature upper limit alarm settings temperature value of interior zinc liquid temperature can be 450 DEG C, and it can be 425 DEG C that lowest temperature, which starts setting value,
It can also according to circumstances be adjusted.Six tunnels are used to detect the temperature of zinc-plated electric furnace internal furnace temperature in multi-path temperature-control instrument 15
Upper limit alarm set temperature value can be 615 DEG C, lowest temperature start setting value can be 530 DEG C, can also according to circumstances into
Row adjustment.
The signal input part of PLC16 further includes reset switch SB, and reset switch SB is separately set in PLC input terminal, is used for
After heating control system temperature upper limit alarms stopping heating or when certain temperature upper limit alarm signal exception individually alarm all the way,
It realizes that zinc-plated electric furnace reheats by reset switch SB after confirmation failure, avoids the side re-powered by PLC16
Formula reheats, and simplifies workflow.
PLC16 uses Mitsubishi PLC in the embodiment of the present invention, and concrete model FX3U-48MR/ES-A can also use it
The PLC of his model；Signal adapter model SIC1000 can also use the signal adapter of other models；Power controller
Specially thyristor power controller, specially KTY3S series digital three-phase thyristor power controller can also use it
His power controller, the present invention is herein with no restrictions.
As shown in Figure 3-4, it is connected between different capacity controller 114 using twisted pair or shielding line, interface uses RS485
Communication interface communicates the RTU communication mode of the MODBUS communications protocol for standard；Many motors control device is connect by RS485 communication
Mouth connects, and 485 signal wire A1, B1 that SIC1000 signal adapter 113 exports are connected；Signal adapter 113 is output to function
The heating signal of rate controller 114 is connected, and each power controller 114 distributes defeated automatically according to IP address setting in heating signal
Period out realizes online power distribution and zinc pot heating.SIC1000 signal adapter 113 is output to 485 signal wire A1, B1
It disconnects；The heating signal for the power controller 114 that signal adapter 113 exports disconnects, and each power controller 114 is according to heating
The IP address setting automatic distribution output period, realizes that zinc pot stops heating in signal, wherein IP address be producer in systems
It to the address that more power controllers 114 are set, and is that producer sets in systems according to the IP address distribution output period
Alright.
The working principle of former control subsystem 11: the first thermocouple 111 is for detecting zinc liquid temperature, the first thermocouple 111
Free end connect with the input terminal of temperature controller 112 by compensating wire, temperature controller 112 ought detect zinc liquid temperature temperature upper limit
When, power controller 114 is controlled by the heating signal that heating signal converter 113 exports and stops heating；Temperature controller 112 is when inspection
When measuring zinc liquid temperature and reaching lowest temperature, passes through the heating signal that heating signal converter 113 exports and control power controller
114 begin to warm up；Specific control mode are as follows: temperature controller 112 according to set temperature temperature upper limit alarming value and temperature upper limit value,
Any given input detection temperature, is compared, according to practical feelings with set temperature upper limit alarm value and temperature upper limit value
Condition can choose the triggering modes such as phase/zero cross fired, Power Regulation triggering, open loop phase-shifting trigger, and be touched according to triggering mode
Hair control, the heating signal control power controller 114 that control signal adapter 113 exports are heated or stop heating；And
And can according to the actual situation in the feedback of temperature carry out the adjusting of set temperature upper limit alarm value and temperature upper limit value, temperature control
The mode of 112 Trig control signal converter 113 of instrument either in temperature controller 112 single-chip microcontroller connect by relay or
Person disconnects, can also by mutually communicating to the configuration software at the end PC, cooperation progress is corresponding to be controlled with single-chip microcontroller in temperature controller 112
Make the transmission of order.
It is wherein used to control 113 output power device 114 of signal adapter in temperature controller 112 in the embodiment of the present invention
The control terminal of heating signal is located at before 113 output end of signal adapter, and the control output end of PLC16 is located at signal adapter
After 113 output end, thus when former control subsystem 11 occur chance failure can not and when alarm, in the embodiment of the present invention
Other seven tunnels can be normally carried out temperature upper limit alarm, avoid because single for detecting zinc liquid temperature and fire box temperature
Detection, which is broken down, leads to not alarm condition, improves the ability because chance failure leads to risk of resisting, and can benefit
Fire box temperature, which is formed, with six tunnel fire box temperature measurements measures the detection system complementary with zinc liquid temperature measurement, many-sided multi-angle
Zinc-plated electric furnace heating control system is monitored.
Embodiment two
As shown in figure 5, the embodiment of the present invention is what is different from the first embodiment is that based on the zinc-plated of PLC in the embodiment of the present invention
Electric furnace heating control system further includes remote terminal 18, and multi-path temperature-control instrument 15 further includes GPRS module 151, GPRS module
151 communicate to connect with remote terminal 18.Remote terminal 18 can be Internet of Things cloud platform, to realize through the intelligence such as mobile phone eventually
The IE remote real-time monitor and control function to temperature control system are held, no worker monitor is realized, has saved human cost.
Embodiment three
As shown in fig. 6, the embodiment of the invention also provides a kind of zinc-plated electric furnace method for heating and controlling based on PLC,
Include:
S1, PLC are powered on, and at least seven counter general reset (clearing) in PLC；
At least seven counters in S2, PLC are to multi-path temperature-control instrument per the effective input signal of the alarm of temperature upper limit all the way
Corresponding counts are carried out, and are summed at least seven counters；
S3, when PLC is more than or equal to 3 to the numerical value that at least seven counters are summed, PLC output relay is connected,
Intermediate relay obtains electric, the heating signal of the power controller of shutoff signal converter output.
When PLC is powered on, M8002 be inceptive impulse special auxiliary relay, M8002 only bring into operation in PLC first
A scan period is electricly interior, remaining time powers off, i.e. the normal opened contact of initialization pulse special auxiliary relay M8002 only exists
Connection when PLC brings into operation, within first scan period (i.e. to seven counter general resets of C1, C2, C3, C4, C5, C6, C7
All reset), so that heating control system is set to the state of a control of former control subsystem.
Meanwhile contact shape special auxiliary relay M8000 is operation monitoring special auxiliary relay, when PLC is run
M8000 obtains electric, M8000 power loss when PLC stops, and M8000 operation monitoring normal opened contact is closed when PLC is run, runs for PLC
When process monitoring.
X001, X002, X003, X004, X005, X006, X007 are respectively first via multi-path temperature-control instrument in multi-path temperature-control instrument
Temperature upper limit alarm switch S11, the second road multi-path temperature-control instrument temperature upper limit alarm switch S21, third road multi-path temperature-control instrument temperature
Upper limit alarm switch S31, the 4th road multi-path temperature-control instrument temperature upper limit alarm switch S41, the 5th road multi-path temperature-control instrument temperature upper limit
Alarm switch S51, the 6th road multi-path temperature-control instrument temperature upper limit alarm switch S61, the alarm of the 7th road multi-path temperature-control instrument temperature upper limit
The soft element input address of switch S71, to prevent system malfunction, per when temperature upper limit alarm input signal is for 10 seconds all the way
System is confirmed as the effective input signal of temperature upper limit alarm, and corresponding counter counts 1；When at least 3 road temperature upper limit alarm signals
When number being kept for 10 seconds or more simultaneously simultaneously or not, the value of C1, C2, C3, C4, C5, C6, C7 counter summation is more than or equal to 3,
PLC confirms that zinc liquid temperature and fire box temperature temperature upper limit, PLC the first internal relay M0 movement, normal opened contact are closed, thus
Output relay Y0 is connected, intermediate relay KA energized action, keeps two pairs of normally-closed contacts for being connected to intermediate relay KA (a pair of normal
Closed contact is a switch) the output of SIC1000 signal adapter 485 signal wire A1, B1 cutting, shutoff signal converter is defeated
The heating signal of power controller out, the wholly off heating of power controller.
Example IV
As shown in fig. 7, the embodiment of the present invention, unlike example IV, the zinc-plated electric furnace based on PLC heats control
Method processed further include:
After S4, PLC are powered on, and to seven data register general resets (clearing) in PLC；
Every lowest temperature all the way of seven data register pair multi-path temperature-control instrument in S5, PLC starts effective input signal
Respective stored is carried out, and is summed at least seven data registers；
S6, when PLC is more than or equal to 4 to the numerical value that seven data registers are summed, PLC output relay is disconnected,
Intermediate relay power loss resets, and connects the heating signal of the power controller of signal adapter output.
When PLC is powered on, M8002 be inceptive impulse special auxiliary relay, M8002 only bring into operation in PLC first
A scan period is electricly interior, remaining time powers off, i.e. the normal opened contact of initialization pulse special auxiliary relay M8002 only exists
Connection when PLC brings into operation, within first scan period (i.e. to D1, D2, D3, D4, D5, D6, D7 data register general reset
It all resets).
Meanwhile contact shape special auxiliary relay M8000 is operation monitoring special auxiliary relay, when PLC is run
M8000 obtains electric, M8000 power loss when PLC stops, and M8000 operation monitoring normal opened contact is closed when PLC is run, runs for PLC
When process monitoring.
X011, X012, X013, X014, X015, X016, X017 are respectively first via multi-path temperature-control instrument in multi-path temperature-control instrument
Lowest temperature starts switch S12, the second road multi-path temperature-control instrument lowest temperature starts switch S22, third road multi-path temperature-control instrument temperature
Lower limit starts switch S32, the 4th road multi-path temperature-control instrument lowest temperature starts switch S42, the 5th road multi-path temperature-control instrument lowest temperature
Start switch S52, the 6th road multi-path temperature-control instrument lowest temperature starts switch S62, the starting of the 7th road multi-path temperature-control instrument lowest temperature
The soft element input address of switch S72, to prevent system malfunction, per when temperature upper limit alarm input signal is for 5 seconds all the way
System is confirmed as lowest temperature and starts effective input signal, corresponding deposit number 1；When at least 4 road lowest temperature enabling signals
When being kept for 5 seconds or more simultaneously simultaneously or not, the value of D1, D2, D3, D4, D5, D6, D7 data register summation is more than or equal to 4,
PLC confirms that zinc liquid temperature and fire box temperature at least 4 points start setting value, the second internal relay of PLC lower than lowest temperature
M1 movement, normal opened contact closure, so that output relay Y0 be made to disconnect, intermediate relay KA power loss resets, and makes to be connected to centre
The SIC1000 signal adapter of two pairs of normally-closed contacts of relay KA is output to 485 signal wire A1, B1 connection；Signal is connected to turn
The heating signal of the power controller of parallel operation output, each power controller is according to the automatic distribution of IP address setting in heating signal
The period is exported, realizes online power distribution and zinc pot heating.Wherein IP address is producer in systems to more power controls
The address that device is set, and be that producer sets in systems according to the IP address distribution output period.
When PLC is more than or equal to 3 to the numerical value that at least seven counters are summed, PLC output relay is connected, intermediate
Relay obtains electric, the heating signal of the power controller of shutoff signal converter output；When PLC is at least seven data registers
The numerical value summed is disconnected more than or equal to 4, PLC output relay, and intermediate relay power loss resets, and it is defeated to connect signal adapter
The heating signal of power controller out；In at least seven tunnels multichannel simultaneously break down probability it is smaller, greatly solve because
Redundancy Design deficiency leads to not the case where realizing temperature upper limit alarm, improves and resists the energy because chance failure leads to risk
Power.
In order to more preferably illustrate multichannel while the probability to break down at least 7 tunnels, the embodiment of the present invention is occurred general with failure
It is illustrated for rate.For example, there is 100 lamps, the model specification of lamp is all identical, and 3 (replacing after bad) were gone bad in 2 years, according to
General modeling pattern, according to Poisson distribution, can calculate the probability that a lamp breaks down in N days of continuous use isWherein, e=2.71828 ...；If there is n lamps, m (replacing after bad) were gone bad in T days, then this lamp exists
The probability to break down in N days of continuous use isX lamps are now provided, there are Y generations events interior on the same day
The probability of barrier isIn conjunction with concrete condition of the present invention, i.e. X=7, Y=
3,4,5,6,7, m=n=1, T=730*24, bringing into can obtain, as Y=3, P 1.8589 × 10^ of ≈ (- 13), and by Y=4,5,6,
7 successively bring into, therefore deduce that the magnitude of the probability to break down simultaneously at least 3 roads in seven tunnel 1 Tian Nei for 10^ (-
13) probability, to break down compared to single channel greatly reduces, and greatly solves because Redundancy Design deficiency leads to not realize temperature
The case where spending upper limit alarm improves and resists the ability because chance failure leads to risk.
PLC output relay Y0 is correspondingly connected with the first internal relay of PLC M0, PLC output relay Y0 disconnection when connecting
When be correspondingly connected with PLC the second internal relay M1, i.e. temperature upper limit upper limit alarm relay M0 and lowest temperature starting relay
M1 independently works, and avoids temperature upper limit upper limit alarm and lowest temperature from starting and shares a relay, causes temperature upper limit
Upper limit alarm and lowest temperature starting work are chaotic.
Embodiment five
As shown in figure 8, in the embodiment of the present invention unlike embodiment five, the zinc-plated electric furnace based on PLC
Method for heating and controlling further include:
When the numerical value that PLC sums to seven data registers is more than or equal to 4, PLC to internal seven counters with
And seven data registers carry out general reset (clearing).
Although embodiment is in technical solution of the present invention to include that two-way is used for zinc liquid temperature detection, six tunnels for fire box temperature
For detection, but the present invention is not intended to limit and detects specific number, such as this hair for zinc liquid temperature detection, for fire box temperature
Bright may include the detection of two-way above zinc liquid temperature and the fire box temperature detection of six tunnel above and below, can be according to practical feelings
Condition adjusts accordingly.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (9)
1. a kind of zinc-plated electric furnace heating control system based on PLC, including former control subsystem, the original control subsystem
It include: the first thermocouple, temperature controller, signal adapter, power controller, the input terminal company of first thermocouple and temperature controller
It connects, the input terminal of the temperature controller is for detecting zinc liquid temperature in zinc-plated electric furnace, and the output end of the temperature controller is for controlling
The heating signal of signal adapter output power device processed, characterized in that further include: the second thermocouple, multi-path temperature-control instrument,
PLC, intermediate relay, several described second thermocouples are connect with multi-path temperature-control instrument, the signal output of the multi-path temperature-control instrument
End is connect with the signal input part of PLC, the actuating coil of the output end connection intermediate relay of the PLC, intermediate relay
The heating signal output end of two pairs of normally-closed contact input terminal connection signal converters, intermediate relay two is to normally-closed contact output end
Power controller is connect in succession；Wherein multi-path temperature-control instrument includes at least input terminal all the way and is used to detect zinc liquid temperature in zinc-plated electric furnace
Degree includes at least six road input terminals for detecting fire box temperature in zinc-plated electric furnace.
2. the zinc-plated electric furnace heating control system based on PLC according to claim 1, characterized in that first heat
The free end of galvanic couple is connected by the input terminal of compensating wire and temperature controller and/or the free end of second thermocouple passes through benefit
Conducting wire is repaid to connect with the input terminal of multi-path temperature-control instrument.
3. the zinc-plated electric furnace heating control system based on PLC according to claim 1, characterized in that further include long-range
Terminal, the multi-path temperature-control instrument further includes GPRS module, and the GPRS module and the remote terminal communicate to connect.
4. the zinc-plated electric furnace heating control system according to claim 1 to 3 based on PLC, characterized in that institute
Stating further includes 7 road multi-path temperature-controls at least in parallel between the signal output end of multi-path temperature-control instrument and the signal input part of the PLC
Instrument temperature upper limit alarm switch, for detecting zinc-plated electric heating in-furnace temperature more than set temperature upper limit value alarm；And extremely
The multi-path temperature-control instrument lower limit of few 7 tunnels parallel connection starts switch, for detecting zinc-plated electric heating in-furnace temperature lower than set temperature lower limit
Start heating when value.
5. the zinc-plated electric furnace heating control system according to claim 4 based on PLC, characterized in that the PLC's
Signal input part further includes reset switch, and the reset switch is used for after heating control system temperature upper limit alarms stopping heating
Or when certain temperature upper limit alarm signal exception individually alarm all the way, zinc-plated electric heating is realized by reset switch after confirmation failure
Furnace reheats.
6. a kind of zinc-plated electric furnace method for heating and controlling based on PLC, characterized in that the method is based on claim 1-
What 5 any zinc-plated electric furnace heating control systems based on PLC were realized, comprising:
PLC is powered on, and at least seven counter general reset in PLC；
At least seven counters in PLC carry out effective input signal of alarming per temperature upper limit all the way of multi-path temperature-control instrument corresponding
It counts, and sums at least seven counters；
When PLC is more than or equal to 3 to the numerical value that at least seven counters are summed, PLC output relay is connected, intermediate relay
Device obtains electric, the heating signal of the power controller of shutoff signal converter output.
7. the zinc-plated electric furnace method for heating and controlling according to claim 6 based on PLC, characterized in that further include:
After PLC is powered on, and at least seven data register general reset in PLC；
At least seven data registers in PLC carry out accordingly multi-path temperature-control instrument per the effective input signal of cold-starting all the way
Storage, and sum at least seven data registers；
When PLC is more than or equal to 4 to the numerical value that at least seven data registers are summed, PLC output relay is disconnected, intermediate
Relay electric-loss resets, and connects the heating signal of the power controller of signal adapter output.
8. the zinc-plated electric furnace method for heating and controlling according to claim 7 based on PLC, characterized in that further include:
When the numerical value that PLC sums at least seven data registers is more than or equal to 4, PLC to internal whole counters with
And total data register carries out general reset respectively.
9. the zinc-plated electric furnace method for heating and controlling according to claim 7 based on PLC, characterized in that the PLC is defeated
The first internal relay of PLC is correspondingly connected with when relay is connected out, and the PLC output relay is correspondingly connected with PLC the when disconnecting
Two internal relays.
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| CN201910514983.3A CN110161961B (en) | 2019-06-14 | 2019-06-14 | PLC-based galvanized electric heating furnace heating control system and method |
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| CN201910514983.3A CN110161961B (en) | 2019-06-14 | 2019-06-14 | PLC-based galvanized electric heating furnace heating control system and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002660A (en) * | 2010-09-17 | 2011-04-06 | 华南理工大学 | Zinc liquid storage tank for hot galvanizing production line and method for storing zinc liquid by using same |
| WO2013025117A1 (en) * | 2011-08-15 | 2013-02-21 | Grabchinsky Aleksandr Vladimirovich | Automatic control panel (acp) |
| CN206162167U (en) * | 2016-11-15 | 2017-05-10 | 天津友发钢管集团股份有限公司 | Gas stove automated control system |
| CN207391530U (en) * | 2017-08-09 | 2018-05-22 | 桐乡市桐德电力配件有限公司 | A kind of hot galvanizing furnace control system |
| CN207663246U (en) * | 2017-12-11 | 2018-07-27 | 鞍钢股份有限公司 | A kind of aluminum-zinc alloy unit furnace area incudes temperature remote control apparatus |
-
2019
- 2019-06-14 CN CN201910514983.3A patent/CN110161961B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002660A (en) * | 2010-09-17 | 2011-04-06 | 华南理工大学 | Zinc liquid storage tank for hot galvanizing production line and method for storing zinc liquid by using same |
| WO2013025117A1 (en) * | 2011-08-15 | 2013-02-21 | Grabchinsky Aleksandr Vladimirovich | Automatic control panel (acp) |
| CN206162167U (en) * | 2016-11-15 | 2017-05-10 | 天津友发钢管集团股份有限公司 | Gas stove automated control system |
| CN207391530U (en) * | 2017-08-09 | 2018-05-22 | 桐乡市桐德电力配件有限公司 | A kind of hot galvanizing furnace control system |
| CN207663246U (en) * | 2017-12-11 | 2018-07-27 | 鞍钢股份有限公司 | A kind of aluminum-zinc alloy unit furnace area incudes temperature remote control apparatus |
Non-Patent Citations (2)
| Title |
|---|
| 刘莹等: "PLC在钢管热镀锌生成线中的应用", 《自动化技术与应用》 * |
| 赵闯: "S7-400PLC在热镀锌生产线控制系统的应用", 《集成电路应用》 * |
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