CN111398336A - Quenching medium cooling performance's on-line monitoring system - Google Patents
Quenching medium cooling performance's on-line monitoring system Download PDFInfo
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- CN111398336A CN111398336A CN202010123123.XA CN202010123123A CN111398336A CN 111398336 A CN111398336 A CN 111398336A CN 202010123123 A CN202010123123 A CN 202010123123A CN 111398336 A CN111398336 A CN 111398336A
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- cooling performance
- line monitoring
- quenching medium
- induction coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention discloses an on-line monitoring system for cooling performance of a quenching medium, which comprises a measuring sensor arranged in the quenching medium, wherein the measuring sensor consists of an induction coil and a standard probe arranged at the geometric center of the induction coil; the device also comprises an induction heating power supply electrically connected with the induction coil and a control unit connected with the standard probe through a cable, wherein the control unit is simultaneously connected with the induction heating power supply through the cable. The on-line monitoring system can monitor the cooling performance of the quenching medium on the production site in real time.
Description
Technical Field
The invention relates to an on-line monitoring system for cooling performance of a quenching medium, and belongs to the technical field of metal processing oil.
Background
The method for testing the cooling performance of the quenching medium comprises various methods, such as an end quenching test method, a hardness U curve method, a quenching intensity method, a magnetic test method, a hot wire method, a 5-second interval test method, a cooling curve method and the like, wherein the cooling curve method is known as the best method for measuring the cooling performance of the quenching medium in a laboratory, and therefore, the method is most widely applied. The cooling characteristic curve method is the most intuitive and effective test means for reflecting the cooling capacity of the quenching medium, and the cooling characteristic curve method is tested worldwide from the last 60 th century, and aims to form relevant standards.
The cooling curve method generally adopts the method that a probe provided with a thermocouple is heated in a tubular air furnace, then the probe is transferred into a medium to be measured, and the cooling process is recorded. Currently, the most used probes are the nickel alloy central temperature probe in the united states, sweden, uk, the surface temperature silver probe in japan, and the central temperature silver probe in france, in which the nickel alloy probe has been recommended by the international organization for standardization (IFHT) as an international standard, i.e., ISO 9950: 1995 "Industrial queuing oil-determination of gasification engineering-Nickel-alloy probe test method". At present, two national parallel standards ISO9950 (GB/T30823 equivalent transformation ISO9950) and SH/T0220 are adopted, wherein ISO9950 is most widely applied. Most domestic quenching medium production enterprises adopt ISO9950 standard for cooling characteristic test, and part of heat treatment production units are equipped with cooling characteristic testers, which has great promotion effect on the popularization of nickel alloy probe standards.
At present, the cooling curve method is only applied to laboratory detection of the cooling performance of the quenching medium, numerous quenching medium manufacturing enterprises in China have large difference of performance indexes and uneven quality, the quenching medium can generate dynamic change of performance in the using process, the manufacturing enterprises cannot effectively monitor the cooling performance of the quenching medium in time, and finally the quality of products in the equipment manufacturing industry of China and the stability of batches of the products are affected. And a professional manufacturer is entrusted to carry out off-line detection and analysis in a laboratory, so that the feedback timeliness is poor, the maintenance and control of the machining liquid cannot be carried out in time, and the quality of a machined product is influenced.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems in the prior art, the invention provides an on-line monitoring system for the cooling performance of a quenching medium, which can monitor the cooling performance of the quenching medium on a production site in real time.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
an on-line monitoring system for the cooling performance of a quenching medium comprises a measuring sensor arranged in the quenching medium, wherein the measuring sensor consists of an induction coil and a standard probe arranged at the geometric center of the induction coil; the device also comprises an induction heating power supply electrically connected with the induction coil and a control unit connected with the standard probe through a cable, wherein the control unit is simultaneously connected with the induction heating power supply through the cable.
Wherein, the standard probe is a probe specified by GB/T30823 standard or SH/T0220 standard.
The diameter of the cross section of the wire used by the induction coil is 3-8 mm, the inner diameter of the coil is 15-25 mm, the number of turns of the coil is 6-12, and the height of the coil is 80-150 mm.
The induction coil is rolled in a mode that two ends are dense and the middle is sparse, namely, the interval between adjacent turns at two ends of the induction coil is 0.1-0.2 mm, and the interval between adjacent turns in the middle of the induction coil is 3-5 mm.
Wherein, the induction heating power supply is connected with 380V three-phase alternating current.
Wherein the induction heating power supply is provided with a circulating cooling unit.
The control unit comprises a wireless communication module, and is connected with the remote control terminal through the wireless communication module.
The control unit is located in an industrial field and provided with a display screen, the display screen can display monitored related data of the quenching medium in real time, the control unit can further comprise an alarm module such as a loudspeaker, and when the control unit monitors that the cooling performance of the quenching medium cannot meet the use requirement through a measuring sensor, the control unit can timely give an alarm to an operator in the industrial field so as to replace the quenching medium.
The invention relates to an on-line monitoring system for cooling performance of a quenching medium, which has the working principle that a whole measuring sensor is arranged in a quenching tank containing the quenching medium in an industrial field, a control unit controls an induction power supply to start heating, and through a specific induction coil structure, the surface temperature of a standard probe exceeds L eidenfrost temperature of the medium to be measured at the instant when the induction heating power supply is switched on (the input power of the induction heating power supply is larger than 8KW at this moment), a stable steam film is formed on the surface of the standard probe (the steam film conducts heat slowly, and the heat conduction rate does not have a heating rate block, so that the standard probe can be integrally heated to 850 ℃ under the existence of the steam film), and finally when the overall temperature of the standard probe in the quenching medium reaches 850 ℃ (a workpiece generally contacts the quenching medium from 850 ℃ in the quenching process to start quenching), the control unit controls the induction heating power supply to stop heating, the quenching medium cools and reduces the temperature of the standard probe, the control unit acquires the real-time temperature of the standard probe, calculates the cooling performance of the quenching medium by combining time parameters.
Has the advantages that: the system adopts an electromagnetic induction immersion heating mode for heating, solves the problem that the existing quenching medium cooling characteristic test cannot be detected on line, and the measuring sensor of the system is directly placed in the quenching tank containing the quenching medium, so that the cooling performance of the quenching medium in a production field can be monitored in real time, thereby assisting field operators to effectively operate and maintain the quenching medium and further improving the quality stability of a quenching product.
Drawings
FIG. 1 is a system schematic diagram of an on-line monitoring system for quenching medium cooling performance according to the present invention;
fig. 2 is a schematic structural diagram of the induction coil.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the specific embodiment.
As shown in fig. 1-2, the system for on-line monitoring of quenching medium cooling performance of the invention comprises a measurement sensor 1 placed in a quenching medium 6, wherein the measurement sensor 1 is composed of an induction coil 2 and a standard probe 3 placed at the geometric center of the induction coil 2, that is, the standard probe 3 and the induction coil 2 are fixed together to form the measurement sensor 1, which is immersed in the medium 6 to be measured, and the measurement sensor 1 is directly placed in a quenching tank 7 containing the quenching medium 6 in an industrial field for on-line monitoring; the on-line monitoring system for the cooling performance of the quenching medium also comprises an induction heating power supply 4 electrically connected with the induction coil 2 and a control unit 5 connected with the standard probe 3 through a cable, wherein the control unit 5 is simultaneously connected with the induction heating power supply 4 through the cable; wherein, the standard probe 3 used by the invention is a nickel alloy probe specified by GB/T30823 standard.
The induction coil 2 used in the on-line monitoring system has the advantages that the number of electric wire turns at two ends of the induction coil 2 is very dense (namely the vertical distance between the adjacent electric wires at the two ends of the coil is 0.1-0.2 mm), the number of electric wire turns at the middle part of the coil is sparse (namely the vertical distance between the adjacent electric wires at the middle part of the coil is 3-5 mm), the induction coil 2 is bound in a way that the upper part and the lower part of the coil are compensated, so that the two ends of the standard probe 3 have larger specific surface power, the problem of uneven heating temperature caused by high cooling speed at the two ends is compensated, the induction coil 2 requires that the section diameter A of the electric wire is 3-8 mm, the inner diameter B of the coil (a circle enclosed by the electric wire) is 15-25 mm, the number of turns of the coil is 6-12, and the height C of the coil is 80-150 mm, so as to ensure the uniformity of the temperature, The more complete and thus more uniform the temperature throughout the heating, the more accurate the measurement results are due to the thermocouple reaction within the standard probe, i.e. the temperature of the whole standard probe (rather than the local temperature at the thermocouple).
The induction heating power supply 4 of the invention is connected with 380V three-phase alternating current, the effective output power is more than 8Kw, high-frequency oscillation current can be output, and the working frequency range is 30KHz-100 KHz. The specific surface power of the surface of the standard probe 3 can be ensured by the induction heating power supply 4, the output oscillation power of the induction heating power supply 4 is greater than 20Kw, and the effective output power is greater than 8 Kw. Meanwhile, the induction heating power supply 4 is provided with a circulating cooling unit 9, and the circulating cooling unit 9 cools the induction heating power supply 4 by adopting double-channel water cooling or oil cooling to prevent the IGBT driver and the related devices in the induction heating power supply from being damaged by overheating. The size of the oscillation current output by the induction heating power supply 4 can be adjusted by the induction heating power supply 4 through the control unit 5, so that the heating speed is adjusted, the proper heating current output is selected according to the difference of the heat exchange capacity of the quenching medium, the starting and the stopping of the induction heating power supply 4 can be triggered and controlled according to an event, and the monitoring on the quenching medium can be started at any time according to the requirement. The monitoring can be carried out at fixed time or period, and trigger events such as quenching transfer, furnace door opening and the like can be set according to the technological process. The data acquisition module in the control unit 5 records the heating and cooling processes of the standard probe 3, and the cooling performance of the quenching medium is obtained by calculating key characteristic indexes such as the steam film forming temperature, the upper characteristic temperature, the lower characteristic temperature, the maximum cooling speed and the like of the output quenching medium.
The control unit 5 is positioned on an industrial field and comprises a wireless communication module, the control unit 5 is connected with a remote control terminal through the wireless communication module, the control unit is further provided with a display screen 8, the display screen 8 can display relevant monitored data of the quenching medium in real time, the control unit 5 can further comprise an alarm module such as a loudspeaker, and when the control unit 5 monitors that the cooling performance of the quenching medium cannot meet the use requirement through the measuring sensor 1, the alarm module gives an alarm to an operator on the industrial field in time so as to replace the quenching medium.
The on-line monitoring system of the invention adopts an electromagnetic induction mode to provide high specific surface power, and a standard probe 3 is used for heating and cooling in a liquid immersion mode, thereby realizing on-line monitoring of the cooling performance of the quenching medium.
Claims (9)
1. An on-line monitoring system of quenching medium cooling performance is characterized in that: the device comprises a measuring sensor arranged in a quenching medium, wherein the measuring sensor consists of an induction coil and a standard probe arranged at the geometric center of the induction coil; the device also comprises an induction heating power supply electrically connected with the induction coil and a control unit connected with the standard probe through a cable, wherein the control unit is simultaneously connected with the induction heating power supply through the cable.
2. The system for on-line monitoring of quench media cooling performance of claim 1, wherein: the standard probe is a probe specified by GB/T30823 standard or SH/T0220 standard.
3. The system for on-line monitoring of quench media cooling performance of claim 1, wherein: the diameter of the cross section of the wire used by the induction coil is 3-8 mm, the inner diameter of the coil is 15-25 mm, the number of turns of the coil is 6-12, and the height of the coil is 80-150 mm.
4. The system for on-line monitoring of quench media cooling performance of claim 3, wherein: the induction coil is made by rolling in a mode that two ends are dense and the middle is sparse.
5. The system for on-line monitoring of quench media cooling performance of claim 4, wherein: the interval between adjacent turns at two ends of the induction coil is 0.1-0.2 mm, and the interval between adjacent turns in the middle of the induction coil is 3-5 mm.
6. The system for on-line monitoring of quench media cooling performance of claim 1, wherein: the induction heating power supply is connected with 380V three-phase alternating current.
7. The system for on-line monitoring of quench media cooling performance of claim 1, wherein: the induction heating power supply is provided with a circulating cooling unit.
8. The system for on-line monitoring of quench media cooling performance of claim 1, wherein: the control unit comprises a wireless communication module and is connected with the remote control terminal through the wireless communication module.
9. The system for on-line monitoring of quench media cooling performance of claim 1, wherein: the control unit also comprises an alarm module and a display module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010123123.XA CN111398336B (en) | 2020-02-27 | 2020-02-27 | Quenching medium cooling performance's on-line monitoring system |
| PCT/CN2020/081332 WO2021168960A1 (en) | 2020-02-27 | 2020-03-26 | Online monitoring system for cooling performance of quenching medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010123123.XA CN111398336B (en) | 2020-02-27 | 2020-02-27 | Quenching medium cooling performance's on-line monitoring system |
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| CN111398336A true CN111398336A (en) | 2020-07-10 |
| CN111398336B CN111398336B (en) | 2021-07-09 |
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| CN202010123123.XA Active CN111398336B (en) | 2020-02-27 | 2020-02-27 | Quenching medium cooling performance's on-line monitoring system |
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| CN (1) | CN111398336B (en) |
| WO (1) | WO2021168960A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354680A (en) * | 2021-12-08 | 2022-04-15 | 东风汽车集团股份有限公司 | PAG quenching medium cooling performance analysis method |
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| CN111398336B (en) | 2021-07-09 |
| WO2021168960A1 (en) | 2021-09-02 |
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