CN106200543A - A kind of carbon-potential control method of gas carburizing heating furnace - Google Patents
A kind of carbon-potential control method of gas carburizing heating furnace Download PDFInfo
- Publication number
- CN106200543A CN106200543A CN201610687739.3A CN201610687739A CN106200543A CN 106200543 A CN106200543 A CN 106200543A CN 201610687739 A CN201610687739 A CN 201610687739A CN 106200543 A CN106200543 A CN 106200543A
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- China
- Prior art keywords
- propane
- passed
- heating furnace
- speed
- carbon
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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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0623—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the set value given to the control element
-
- 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
- G05B2219/16—Plc to applications
- G05B2219/163—Domotique, domestic, home control, automation, smart, intelligent house
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a kind of carbon-potential control method of gas carburizing heating furnace, it uses the carbon potential in Controlled by Programmable Controller gas carburizing heating furnace, and it comprises the steps: 1) complete the connection of Programmable Logic Controller and heating furnace；2) before making charcoal oxygen probe, propane is passed through speed and samples, and gathers N number of sampled value altogether；3) arithmetic mean of instantaneous value that N number of propane is passed through the sampled value of speed is calculated, this arithmetic mean of instantaneous value is passed through speed control value as the propane in oxygen probe coke combustion: 4) start oxygen probe and make charcoal flow process, in coke combustion, described Programmable Logic Controller controls propane by described current velocity controller and is passed through pipeline and is passed through speed control value by described propane and passes through propane continuously.The present invention ensure that in oxygen probe coke combustion, and the carbon potential in heating furnace keeps the carbon potential in the heating furnace before making charcoal with oxygen probe basically identical, so that the carbon potential in heating furnace keeps stable, improves the carburizing effect of workpiece.
Description
Technical field
The present invention relates to carbon-potential control field, a kind of carbon-potential control method of gas carburizing heating furnace.
Background technology
Gas carburizing heating furnace is the most the most frequently used carburizing heating furnace, and it is passed through heating after being mixed mutually with air by propane
In stove, under the high temperature of 1000～1100 DEG C, propane and air reaction and generate so-called carburizing atmosphere (with CO, H2, N2, for
Main composition, includes trace amounts of CO 2, H2O, CH4), then the workpiece of heating furnace inner tube is carried out by becoming gas, be placed on heating furnace
Interior workpiece completes carburizing in the carburizing atmosphere of high temperature.
In order to ensure the stability of carburization process, need the carbon potential (carbon potential) in heating furnace is effectively measured and
Management.Along with the continuous progress of oxygen probe manufacturing technology, the monitoring of carbon potential atmosphere in recent years controls the most how to use oxygen to visit
Head is as carbon sensor.Oxygen probe is as the crucial sensing element of carbon-potential control technology, with other kinds of carbon sensor, such as dew
Point instrument, carbon dioxide radar stealthy materials and Resistance probe are compared, and have precision height, accuracy rate measurement good, direct, to need not to take gas etc. all
Many advantages.
But, owing to oxygen probe is placed directly within the furnace chamber of gas carburizing heating furnace, it is straight with the carbon potential atmosphere in furnace chamber
Contact, inevitably places oneself in the midst of in all kinds of carburizing reagent.So, the surface of oxygen probe is easy to deposit one layer " white carbon black ",
If cleared up not in time, " white carbon black " is the most thickening, finally makes the certainty of measurement of oxygen probe be gradually lowered even loss of function.Mesh
Before, the method for the most frequently used removal " white carbon black ", it is simply that carry out an oxygen probe at set intervals and make charcoal, with burning-off oxygen probe table
" white carbon black " in face.
In prior art, in oxygen probe coke combustion, typically can disconnect propane pipeline, stop being passed through of propane.Thus, make
Become the carbon potential in heating furnace to reduce, have impact on the carburizing effect of workpiece in heating furnace.It is therefore desirable to develop a kind of new
Carbon-potential control method so that at oxygen probe coke combustion, the carbon potential of the atmosphere in heating furnace can keep stable.
Summary of the invention
The present invention is directed to above-mentioned technical problem, it is provided that a kind of carbon-potential control method of gas carburizing heating furnace, it is at oxygen
Probe gathers the propane of several time points and is passed through speed before making charcoal, and the sampled data that these propane are passed through speed is carried out
Arithmetic mean is passed through speed control value to set the propane in oxygen probe coke combustion, in oxygen probe coke combustion, as long as with
This propane is passed through speed control value and is passed through speed by propane, i.e. can guarantee that the carbon potential of the atmosphere in heating furnace keeps stable, its
Concrete technical scheme is as follows:
A kind of carbon-potential control method of gas carburizing heating furnace, it uses Controlled by Programmable Controller gas carburizing heating furnace
In carbon potential, it comprises the steps: 1) complete the connection of Programmable Logic Controller and heating furnace: the data acquisition of Programmable Logic Controller
The current meter that collection end is passed through on pipeline with the propane being arranged on heating furnace is connected, the output control terminal of Programmable Logic Controller and propane
The current velocity controller being passed through pipeline connects；2) before making charcoal oxygen probe, propane is passed through speed and samples: open able to programme
Controller, is passed through speed continuously and carries out n times sampling with predetermined sampling time interval to propane；Meanwhile, Programmable Logic Controller
Unit records also preserves above-mentioned N number of propane and is passed through the sampled value of speed, is designated as C (1), C (2) ... C (N)；3) arithmetic is passed through
Averagely it is passed through speed control value with the propane in acquirement oxygen probe coke combustion: the computing unit of Programmable Logic Controller reads storage
N number of propane in unit is passed through the sampled value of speed and calculates the arithmetic mean of instantaneous value that N number of propane is passed through the sampled value of speed, will
This arithmetic mean of instantaneous value is passed through speed control value as the propane in oxygen probe coke combustion；4) start oxygen probe coke combustion and control
Carbon potential in heating furnace processed: in coke combustion, described Programmable Logic Controller controls propane by described current velocity controller and is passed through
Pipeline is by described step 3) the described propane that generates is passed through speed control value and is passed through propane continuously in heating furnace.
Further, the value of described N is 40, and described sampling time interval is 30 seconds.
Further, described Programmable Logic Controller is Siemens S7-300 PLC.
Compared with prior art, the method have technical effect that: it ensure that in oxygen probe coke combustion, heating furnace
Interior carbon potential keeps the carbon potential in the heating furnace before making charcoal with oxygen probe basically identical, so that the carbon potential in heating furnace keeps
Stable, improve the carburizing effect of workpiece.
Detailed description of the invention
Above the present invention has been carried out the most detailed description with certain particularity.Ordinary skill in art
Personnel are it should be understood that what description in embodiment was merely exemplary, before without departing from true spirit and scope of the present invention
Put that making is changed all should belong to protection scope of the present invention.Scope of the present invention is by described power
That profit claim is defined rather than limited by the foregoing description in embodiment.
The carbon potential computational methods that below describing the present invention provides calculate in net belt type gas carburizing heater control system
One specific embodiment of carbon potential.
Embodiment 1
The Programmable Logic Controller that the present embodiment uses is Siemens S7-300 PLC, and this PLC includes memory element and calculating
Unit.
The concrete calculating process of the present embodiment is as follows:
Step 1, complete the connection of Programmable Logic Controller and heating furnace:
The current meter that the data acquisition end of Programmable Logic Controller is passed through on pipeline with the propane being arranged on heating furnace is connected, can
The output control terminal of programmable controller is passed through the current velocity controller of pipeline and is connected with propane
Step 2, oxygen probe is made charcoal before propane be passed through speed and sample:
Open Programmable Logic Controller, propane is passed through speed sampling 20 minutes continuously with the sampling time intervals of 30 seconds, altogether
Get 40 sampled values；Meanwhile, the unit records of Programmable Logic Controller preserve above-mentioned 40 propane and be passed through speed
Sampled value, is designated as C (1), C (2) ... C (40)；
Step 3, it is passed through speed control value by arithmetic average obtaining the propane in oxygen probe coke combustion:
40 propane that the computing unit of Programmable Logic Controller reads in memory element are passed through the sampled value of speed and calculate
Go out the arithmetic mean of instantaneous value that 40 propane are passed through the sampled value of speed, using this arithmetic mean of instantaneous value as third in oxygen probe coke combustion
Alkane is passed through speed control value；
Step 4, startup oxygen probe coke combustion also control the carbon potential in heating furnace:
In coke combustion, described Programmable Logic Controller controls propane by described current velocity controller and is passed through pipeline by described
Step 3) propane that sets is passed through speed control value and is passed through propane continuously in heating furnace.
The present invention ensure that in oxygen probe coke combustion, and the carbon potential in heating furnace keeps the heating before making charcoal with oxygen probe
Carbon potential in stove is basically identical, so that the carbon potential in heating furnace keeps stable, improves the carburizing effect of workpiece.
Above the present invention has been carried out the most detailed description with certain particularity.Ordinary skill in art
Personnel are it should be understood that what description in embodiment was merely exemplary, before without departing from true spirit and scope of the present invention
Put that making is changed all should belong to protection scope of the present invention.Scope of the present invention is by described power
That profit claim is defined rather than limited by the foregoing description in embodiment.
Claims (3)
1. a carbon-potential control method for gas carburizing heating furnace, it uses in Controlled by Programmable Controller gas carburizing heating furnace
Carbon potential, it is characterised in that it comprises the steps:
1) connection of Programmable Logic Controller and heating furnace is completed:
The current meter that the data acquisition end of Programmable Logic Controller is passed through on pipeline with the propane being arranged on heating furnace is connected, able to programme
The output control terminal of controller is passed through the current velocity controller of pipeline and is connected with propane；
2) before making charcoal oxygen probe, propane is passed through speed and samples:
Open Programmable Logic Controller, continuously propane is passed through with predetermined sampling time interval speed and carries out n times sampling；Meanwhile,
The unit records of Programmable Logic Controller also preserves above-mentioned N number of propane and is passed through the sampled value of speed, is designated as C (1), C (2) ... C
(N)；
3) it is passed through speed control value by arithmetic average obtaining the propane in oxygen probe coke combustion:
N number of propane that the computing unit of Programmable Logic Controller reads in memory element is passed through the sampled value of speed and calculates N number of
Propane is passed through the arithmetic mean of instantaneous value of the sampled value of speed, is passed through as the propane in oxygen probe coke combustion by this arithmetic mean of instantaneous value
Speed control value；
4) start oxygen probe coke combustion and control the carbon potential in heating furnace:
In coke combustion, described Programmable Logic Controller controls propane by described current velocity controller and is passed through pipeline by described step
3) the described propane generated is passed through speed control value and is passed through propane continuously in heating furnace.
2. the carbon-potential control method of gas carburizing heating furnace as claimed in claim 1, its feature is being: the value of described N is
40, described sampling time interval is 30 seconds.
3. the carbon-potential control method of gas carburizing heating furnace as claimed in claim 1, its feature is being: described programmable control
Device processed is Siemens S7-300 PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610687739.3A CN106200543A (en) | 2016-08-17 | 2016-08-17 | A kind of carbon-potential control method of gas carburizing heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610687739.3A CN106200543A (en) | 2016-08-17 | 2016-08-17 | A kind of carbon-potential control method of gas carburizing heating furnace |
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| CN106200543A true CN106200543A (en) | 2016-12-07 |
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| CN201610687739.3A Pending CN106200543A (en) | 2016-08-17 | 2016-08-17 | A kind of carbon-potential control method of gas carburizing heating furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794789A (en) * | 2019-11-18 | 2020-02-14 | 江麓机电集团有限公司 | Infiltration acceleration control system based on direct generation type atmosphere carburization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1560317A (en) * | 2004-02-17 | 2005-01-05 | 上海宝华威热处理设备有限公司 | Dynamic control system for low-pressure carburating heat treament furnace |
| CN102146507A (en) * | 2010-11-12 | 2011-08-10 | 苏州工业园区姑苏科技有限公司 | Carbon potential control system for thermal process equipment |
| CN106119767A (en) * | 2016-07-26 | 2016-11-16 | 江苏丰东热技术股份有限公司 | The method that carbon potential is stable is maintained when a kind of oxygen probe is made charcoal |
-
2016
- 2016-08-17 CN CN201610687739.3A patent/CN106200543A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1560317A (en) * | 2004-02-17 | 2005-01-05 | 上海宝华威热处理设备有限公司 | Dynamic control system for low-pressure carburating heat treament furnace |
| CN102146507A (en) * | 2010-11-12 | 2011-08-10 | 苏州工业园区姑苏科技有限公司 | Carbon potential control system for thermal process equipment |
| CN106119767A (en) * | 2016-07-26 | 2016-11-16 | 江苏丰东热技术股份有限公司 | The method that carbon potential is stable is maintained when a kind of oxygen probe is made charcoal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794789A (en) * | 2019-11-18 | 2020-02-14 | 江麓机电集团有限公司 | Infiltration acceleration control system based on direct generation type atmosphere carburization |
| CN110794789B (en) * | 2019-11-18 | 2022-07-22 | 江麓机电集团有限公司 | Infiltration acceleration control system based on direct generation type atmosphere carburization |
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| CB02 | Change of applicant information |
Address after: 224100 No. 333 Nanxiang Road, Yancheng City economic and Technological Development Zone, Dafeng District, Jiangsu Applicant after: Jiangsu Fengdong Thermal Technology Co., Ltd. Address before: 224199 No. 333 Nanxiang Road, Yancheng City economic and Technological Development Zone, Jiangsu Applicant before: Jiangsu Fengdong Thermal Technology Co., Ltd. |
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Application publication date: 20161207 |
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| RJ01 | Rejection of invention patent application after publication |