CN201482890U - Temperature control device of moving blanks in intermediate frequency diathermic furnace - Google Patents
Temperature control device of moving blanks in intermediate frequency diathermic furnace Download PDFInfo
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- CN201482890U CN201482890U CN2009201925606U CN200920192560U CN201482890U CN 201482890 U CN201482890 U CN 201482890U CN 2009201925606 U CN2009201925606 U CN 2009201925606U CN 200920192560 U CN200920192560 U CN 200920192560U CN 201482890 U CN201482890 U CN 201482890U
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Abstract
The utility model discloses a temperature control device of moving blanks in an intermediate frequency diathermic furnace. The device comprises a temperature control instrument, two thermocouple wires (2), a guide rail and a moving plate (6), wherein the same ends of the two thermocouple wires (2) are connected with a contact of the temperature control instrument and the other ends thereof are mutually welded as a temperature measurement node (4); the guide rail is fixed at the upper part of a furnace chamber (12); the moving plate (6) slides to be matched in the guide rail and the front end of the moving plate (6) is fixed with a baffle plate (7); each thermocouple wire (2) is bent into a horizontal part and vertical parts, the horizontal part is fixed on the moving plate (6) and the vertical part extends downwards; the temperature measurement node (4) is at the lower end of the two vertical parts; and a compressing device is arranged between the temperature measurement node (4) and the moving plate (6). The temperature control device can accurately and continuously measure the temperature value of the same blank at the same position during the whole diathermic process of blanks.
Description
Technical field
The utility model relates to a kind of attemperating unit that forges blank warm in the field, specifically is the attemperating unit of travelling stock in a kind of intermediate frequency diathermic furnace, in other words, is a kind of device that the diathermanous process of travelling stock in the intermediate frequency diathermic furnace is carried out temperature control.
Background technology
The intermediate frequency diathermic furnace is short with its thermal efficiency height, heat time heating time, and the surface of the work oxidation and decarbonization after the heating is few, workpiece distortion is little, controllability good, be easy to realize characteristics such as mechanization and automation, is widely used in the forging field.Because whether the temperature value of the blank that forges and internal and external temperature evenly directly affect the tissue and the mechanical property of forging, so the temperature after diathermanous reaches designing requirement value and blank internal-external temperature difference minimum (being equalizing temperature) with the blank requirement of intermediate frequency diathermic furnace diathermanous (being through heating).
And whether temperature value and the internal and external temperature of blank of blank after diathermanous evenly is by three parameters decisions of diathermanous frequency of the diathermanous power density of the time of staying of blank in body of heater, blank, intermediate frequency diathermic furnace.When the intermediate frequency diathermic furnace was diathermanous, blank was long at residing time in furnace, can cause thickening of its surface oxide layer, even burning, and the obdurability that causes forging the position worsens, thereby shortened forging service life; Blank is too short at residing time in furnace, and then its temperature is low excessively, can't forge and press smoothly, shortens the service life of forging equipment.The diathermanous power density of blank is meant the diathermanous power of the blank of unit are, it is by the decision of the power output of intermediate frequency diathermic furnace, the diathermanous power density of blank then determines the burn-off rate of blank, causes the overheated even fusing of surface of the work if diathermanous power density is crossed conference; If the too small meeting of diathermanous power density makes workpiece long heat time heating time, finally cause production efficiency low.The diathermanous frequency of intermediate frequency diathermic furnace then determines the depth of penetration heating of blank, and diathermanous frequency is too high, can make that heat penetration is shallow, finally causes the internal-external temperature difference of blank excessive; And diathermanous underfrequency though can reduce internal-external temperature difference, can cause that electric current and copper loss that heater coil is total increase, and finally causes electrical efficiency to reduce, and energy consumption increases.And the temperature control of travelling stock in the intermediate frequency diathermic furnace, be exactly by regulating the time of staying of blank in body of heater, the power output of intermediate frequency diathermic furnace, three parameters of diathermanous frequency of intermediate frequency diathermic furnace, make the temperature of the blank after diathermanous reach designing requirement value and equalizing temperature, and then guarantee that the tissue of blank and mechanical property satisfy and forge requirement.
But the attemperating unit of prior art is difficult to the intermediate frequency diathermic furnace is carried out accurately real-time temperature control, and its concrete reason is as follows:
The attemperating unit of prior art comprises contactless and contact.Contactless attemperating unit is by measuring the radiant energy of blank, converse temperature value according to the corresponding relation between heat radiation energy and the temperature, yet during the body of heater heating, producing a large amount of smog and dust in the furnace chamber disturbs the process generation of temperature measuring equipment receiver radiation energy, so contactless attemperating unit thermometric poor effect, the temperature acquisition precision is low, and, more crucial is, be subjected to the restriction of narrow space in the furnace chamber, temperature measuring equipment can't follow up with blank, can only measure the temperature value in furnace chamber porch and exit, so the acquisition range of temperature is little.Contact attemperating unit such as protection tube thermojunction type are meant the protective casing that one deck ceramic material is set outside thermocouple; blank contacts with protection tube; by protection tube the heat transferred thermocouple is carried out thermometric; but because the hysteresis quality on the protection tube life period; so the acquisition precision of temperature is low; and; because narrow space in the furnace chamber; the slit is very little between furnace wall and the blank; so be difficult to thermocouple is located at furnace chamber inside; a thermocouple can only be set in the furnace chamber exit,, can't satisfy the required precision of temperature control equally so the acquisition range of temperature is little.
Because there are various limitations in above-mentioned attemperating unit, also can only be to regulate the time of staying of blank in body of heater, power output and these three parameters of diathermanous frequency of intermediate frequency diathermic furnace according to experience according to the temperature value of furnace chamber exit blank so do the temperature control method of travelling stock in the intermediate frequency diathermic furnace of Equipment Foundations with said apparatus.But the heating of intermediate frequency diathermic furnace is that blank is placed alternating magnetic field, utilize the inner induced-current that produces of blank with blank heating, the blank temperature rising can make the electric conductivity of blank, magnetic property all change, that is to say, influence each other, intercouple between electromagnetic field in the stove and the temperature field.Therefore, when the diathermanous parameter of definite blank, only depend on the temperature value and the experience of furnace chamber exit blank to judge, can't guarantee that the diathermanous temperature value of blank reaches designing requirement and equalizing temperature.Even through the debugging of repeated multiple times, three parameters that draw are also undesirable.
So at present, what people generally adopted is to leave sizable heating surplus to remedy the inaccurate defective that causes of heating parameters, but certainly will cause the waste of the energy like this, and for having the forging that better quality requires, this coarse temperature control can't be satisfied the needs of forging.
The utility model content
The technical problems to be solved in the utility model is, provide a kind of can be in the diathermanous overall process of blank accurately, the attemperating unit of travelling stock in the intermediate frequency diathermic furnace of the temperature value of the same blank same position of continuous measurement.
Technical solution of the present utility model is, the attemperating unit of travelling stock in a kind of intermediate frequency diathermic furnace is provided, it comprises temperature control instrument, two thermocouple wires that constitute by the material conductor of two kinds of heterogeneities, two compensating wires, the intermediate frequency switch board, the PLC control panel, a guide rail and a movable plate, the same end of two thermocouple wires is connected with the contact of temperature control instrument by two compensating wires, the other end of two thermocouple wires is fused into temperature measurement node mutually, described temperature control instrument is electrically connected with the intermediate frequency switch board, described intermediate frequency switch board is electrically connected with the PLC control panel, described guide rail is fixed on the furnace chamber top of intermediate frequency diathermic furnace, described movable plate is slidingly tied in the guide rail, the front end of described movable plate is fixed with a baffle plate, every thermocouple wire is bent into the lateral part and vertically to part, described lateral part is fixed on the movable plate, described vertically to part extension downwards, described temperature measurement node is positioned at two vertically to the lower end of part, is provided with the hold down gag that temperature measurement node can be pressed on the blank upper surface between described temperature measurement node and the movable plate.
The attemperating unit of travelling stock compared with prior art has following remarkable advantage and beneficial effect in the utility model intermediate frequency diathermic furnace:
Because the thermocouple wire and the movable plate of the attemperating unit of travelling stock are fixed in the utility model intermediate frequency diathermic furnace, and the movable plate front end is provided with baffle plate, and be provided with the hold down gag that temperature measurement node can be pressed on the blank upper surface between described temperature measurement node and the movable plate, so with the front end of tested blank and baffle plate pushes against and by hold down gag temperature measurement node is pressed on the blank upper surface after, along with blank moves diathermanous in furnace chamber, push and block plate before the blank meeting of moving, and then drive movable plate and thermocouple wire, make thermocouple wire vertically to the temperature measurement node of part lower end also all the time along with blank moves, and because the compacted device of temperature measurement node is pressed on the blank upper surface, like this, this attemperating unit can be in the diathermanous overall process of blank the temperature value of the same position of the same blank of continuous measurement, realized real-time tracking thermometric to travelling stock; Because temperature measurement node directly contacts with tested blank, attemperating unit of the present utility model has overcome the shortcoming that contactless attemperating unit is subjected to the temperature measurement error of interior smog of furnace chamber and dust interference generation, certainty of measurement height again; Same because temperature measurement node directly contacts with tested blank, the utility model attemperating unit has overcome the shortcoming of protecting the tubular type attemperating unit to have hysteresis quality on the time, so the certainty of measurement height; Also owing to being provided with the hold down gag that temperature measurement node can be pressed on the blank upper surface between described temperature measurement node and the movable plate, so the utility model attemperating unit can be applicable to the blank of different size.
As improvement, described temperature measurement node is hemispherical, and the upper surface shape of the lower surface of described temperature measurement node and blank is coincide, and like this, has increased the contact area of temperature measurement node and blank, has improved the accuracy of measuring; And, the upper surface shape of the lower surface of described temperature measurement node and blank is coincide, make the compacted device of temperature measurement node be pressed on the blank upper surface more firmly, avoided relatively moving of temperature measurement node and blank, guaranteed thermometric, improved accuracy and the stability measured the same position of same blank.
As improving, described guide rail, movable plate, baffle plate, spring all be non-magnet_conductible material as magnetic stainless steel formation not, like this, have avoided above-mentioned parts to generate heat under the induction effect in intermediate frequency magnetic field, have improved the service life of above-mentioned parts again.
The method of utilizing attemperating unit of the present utility model that the diathermanous process of travelling stock in the intermediate frequency diathermic furnace is carried out temperature control, its step is as follows:
A, determine ideal curve,, utilize the Computer Simulation software simulation to go out evenly diathermanous temperature and time curve of optimized blank according to the size and the material of blank, i.e. ideal curve, and with this ideal curve input temperature control instrument;
B, find out the blank of the designing requirement pairing time of temperature value after diathermanous from this curve, this time is exactly the blank optimum value of the time of staying in body of heater;
C, blank is begun the diathermanous moment as the initial moment in body of heater, measure the temperature value of this moment blank by the described temperature measuring equipment of claim 1;
The temperature value of synchronization compares on temperature value that d, temperature control instrument measure previous step in rapid and the ideal curve among the step a, obtains difference;
The difference that e, temperature control instrument obtain previous step in rapid feeds back to the intermediate frequency switch board;
F, intermediate frequency switch board converse suitable magnitude of voltage, current value and frequency values according to the difference of the rapid middle feedback of previous step, and above-mentioned magnitude of voltage, current value and frequency values are applied to the induction coil two ends of intermediate frequency diathermic furnace, make the intermediate frequency diathermic furnace produce new output power value and diathermanous frequency values, new output power value of Chan Shenging and diathermanous frequency values this moment can make the temperature value of blank this moment temperature value on ideal curve approach;
G, write down the power output and the diathermanous frequency of intermediate frequency diathermic furnace this moment with the PLC control panel;
H, after once the thermometric process finishes on the described attemperating unit of claim 1, experience a temperature value acquisition time interval, measure the temperature value of this moment blank again with the described attemperating unit of claim 1;
I, repeating step d～g;
J, repeating step h～i repeatedly leave body of heater until diathermanous the finishing of blank;
K, the power output and the diathermanous frequency of each intermediate frequency diathermic furnace constantly in the diathermanous overall process of blank of PLC control panel record imported computer, draw the match value of the power output and the diathermanous frequency of intermediate frequency diathermic furnace, the optimum value of the power output that above-mentioned two match values are exactly the intermediate frequency diathermic furnace, two parameters of diathermanous frequency of intermediate frequency diathermic furnace by the computer numerical fitting method.
The conventional method of three parameters that draw through the debugging of repeated multiple times with respect to the temperature value that only depends on furnace chamber exit blank and experience, because the utility model attemperating unit has been arranged, so can adopt the temperature control method of travelling stock in the above intermediate frequency diathermic furnace, and this method is only through once regulating, just can accurately obtain the time of staying of blank in body of heater, these three parameters of the power output of intermediate frequency diathermic furnace and diathermanous frequency, make the temperature of the blank after diathermanous reach designing requirement value and equalizing temperature, and then guarantee that the tissue of blank and mechanical property satisfy the forging requirement, so quicker, more accurate; With respect to the conventional method that leaves sizable heating surplus, be that the temperature control method energy consumption waste of Equipment Foundations is little, control accuracy is high, diathermanous blank more meets the forging requirement with the utility model attemperating unit.
Description of drawings
Fig. 1 is the partial elevational sectional structure schematic diagram of the attemperating unit of travelling stock in the utility model intermediate frequency diathermic furnace.
Fig. 2 is the local structure for amplifying schematic diagram of Fig. 1.
Fig. 3 is the side-looking structural representation of the attemperating unit of travelling stock in the utility model intermediate frequency diathermic furnace.
Fig. 4 is the local structure for amplifying schematic diagram of Fig. 2.
Fig. 5 is to be the curve of the actual diathermanous temperature and time of evenly diathermanous temperature and time curve of optimized blank in the temperature control method of travelling stock in the intermediate frequency diathermic furnace of Equipment Foundations and blank with the utility model attemperating unit.
Fig. 6 is to be schematic diagram when in the temperature control method of travelling stock in the intermediate frequency diathermic furnace of Equipment Foundations the diathermanous frequency of intermediate frequency diathermic furnace being carried out match with the utility model attemperating unit.
Fig. 7 is to be schematic diagram when in the temperature control method of travelling stock in the intermediate frequency diathermic furnace of Equipment Foundations the power output of intermediate frequency diathermic furnace being carried out match with the utility model attemperating unit.
Shown in the figure 1, temperature control instrument, 2, thermocouple wire, 3, compensating wire, 4, temperature measurement node, 5, guide rail, 6, movable plate, 7, baffle plate, 8, ceramic gasket I, 9, ceramic gasket II, 10, stage clip, 11, blank, 12, furnace chamber.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the attemperating unit of travelling stock in the utility model intermediate frequency diathermic furnace, it comprises thermocouple wire that temperature control instrument 1, two be made of the material conductor of two kinds of heterogeneities 2, two compensating wires 3, intermediate frequency switch board (indicating among the figure), PLC control panel (indicating among the figure), a guide rail 5 and movable plates 6.The same end of two thermocouple wires 2 is connected with the contact of temperature control instrument 1 by two compensating wires 3, promptly an end of a thermocouple wire 2 is connected with a contact of temperature control instrument 1 by a compensating wire 3, and the same end of another root thermocouple wire 2 is connected with another contact of temperature control instrument 1 by another root compensating wire 3.The other end of two thermocouple wires 2 is fused into temperature measurement node 4 mutually.Described temperature control instrument 1 is electrically connected with the intermediate frequency switch board, and described intermediate frequency switch board is electrically connected with the PLC control panel.Described temperature control instrument 1 is commercially available intelligent temperature control instrument, and its model is XMTA-808, is provided with integrated amplifier in the temperature control instrument 1 of this model, energy video data and comparing data; Described intermediate frequency switch board is commercially available, and its model is GW-J, and the intermediate frequency switch board of this model contains analog circuit, can send instruction according to the information of receiving and regulate and control some parameter; Described PLC control panel is commercially available, and its model is Siemens S7-200.
Described guide rail 5 is fixed on furnace chamber 12 tops of intermediate frequency diathermic furnace, and described movable plate 6 is slidingly tied in the guide rail 5, and the front end of described movable plate 6 is fixed with a baffle plate 7.Every thermocouple wire 2 is bent into the lateral part and vertically to part.Described lateral part is fixed on the movable plate 6, be that described movable plate 6 is hollow structure, described two thermocouple wires 2 are wrapped with the glass wool cloth of one deck high-temperature insulation thermal insulation, and the lateral part of every thermocouple wire 2 is filled with fire clay between the glass wool cloth of the hollow bulb of movable plate 6 and lateral part and movable plate 6.Described vertically to part extension downwards.Described temperature measurement node 4 is positioned at two, and described temperature measurement node 4 is hemispherical vertically to the lower end of part, the upper surface shape of the lower surface of described temperature measurement node 4 and blank 11 coincide (not drawing among the figure).Be provided with the hold down gag that temperature measurement node 4 can be pressed on blank 11 upper surfaces between described temperature measurement node 4 and the movable plate 6, the top that is described temperature measurement node 4 is fixed with ceramic washer I 8, the vertical top to part of described thermocouple wire 2 is provided with the ceramic washer II9 that fixes with movable plate 6, be provided with stage clip 10 between described ceramic washer I 8 and the ceramic washer II9, described thermocouple wire 2 vertically run through ceramic washer II 9, stage clip 10 and ceramic washer I 8 from top to bottom successively to part.All to be non-magnet_conductible material constitute as magnetic stainless steel not for described guide rail 5, movable plate 6, baffle plate 7, stage clip 10.
As Fig. 5, Fig. 6, shown in Figure 7, the method for utilizing attemperating unit of the present utility model that the diathermanous process of travelling stock in the intermediate frequency diathermic furnace is carried out temperature control, its step is as follows:
A, determine ideal curve,, utilize Computer Simulation software such as Ansys simulation software to simulate optimized blank 11 even diathermanous temperature and time curves according to the size and the material of blank 11, i.e. ideal curve, and with this ideal curve input temperature control instrument 1; If in the diathermanous process of blank the blank temperature value over time with this curves, the blank satisfied temperature homogenising after then diathermanous;
B, find out the blank 11 of the designing requirement pairing time of temperature value after diathermanous from this curve, this time is exactly blank 11 optimum value of the time of staying in body of heater;
C, blank 11 is begun the diathermanous moment as the initial moment in body of heater, measure the temperature value of this moment blank 11 by the described temperature measuring equipment of claim 1;
The temperature value of synchronization compares on temperature value that d, temperature control instrument 1 measure previous step in rapid and the ideal curve among the step a, obtains difference;
The difference that e, temperature control instrument 1 obtain previous step in rapid feeds back to the intermediate frequency switch board;
F, intermediate frequency switch board converse suitable magnitude of voltage, current value and frequency values according to the difference of the rapid middle feedback of previous step, and above-mentioned magnitude of voltage, current value and frequency values are applied to the induction coil two ends of intermediate frequency diathermic furnace, make the intermediate frequency diathermic furnace produce new output power value and diathermanous frequency values, new output power value of Chan Shenging and diathermanous frequency values this moment can make the temperature value of blank 11 this moment temperature value on ideal curve approach;
G, write down the power output and the diathermanous frequency of intermediate frequency diathermic furnace this moment with the PLC control panel;
H, after once the thermometric process finishes on the described attemperating unit of claim 1, experience a temperature value acquisition time at interval, measure the temperature value of this moment blank 11 again with the described attemperating unit of claim 1, the process institute interlude of twice collecting temperature before and after the described temperature acquisition time interval is meant, it is set on temperature control instrument 1 as required by people, as 0.01s;
I, repeating step d～g;
J, repeating step h～i repeatedly leave body of heater until blank 11 diathermanous finishing;
K, the power output and the diathermanous frequency of each intermediate frequency diathermic furnace constantly in the blank 11 diathermanous overall processes of PLC control panel record imported computer, draw the match value of the power output and the diathermanous frequency of intermediate frequency diathermic furnace, the optimum value of the power output that above-mentioned two match values are exactly the intermediate frequency diathermic furnace, two parameters of diathermanous frequency of body of heater by computer numerical fitting method such as linear fitting.
Claims (6)
1. the attemperating unit of travelling stock in the intermediate frequency diathermic furnace, it comprises temperature control instrument (1), two thermocouple wires (2) that constitute by the material conductor of two kinds of heterogeneities, two compensating wires (3), intermediate frequency switch board and PLC control panel, the same end of two thermocouple wires (2) is connected with the contact of temperature control instrument (1) by two compensating wires (3), the other end of two thermocouple wires (2) is fused into temperature measurement node (4) mutually, described temperature control instrument (1) is electrically connected with the intermediate frequency switch board, described intermediate frequency switch board is electrically connected with the PLC control panel, it is characterized in that: it also comprises a guide rail (5) and a movable plate (6), described guide rail (5) is fixed on furnace chamber (12) top of intermediate frequency diathermic furnace, described movable plate (6) is slidingly tied in the guide rail (5), the front end of described movable plate (6) is fixed with a baffle plate (7), every thermocouple wire (2) is bent into the lateral part and vertically to part, described lateral part is fixed on the movable plate (6), described vertically to part extension downwards, described temperature measurement node (4) is positioned at two vertically to the lower end of part, is provided with the hold down gag that temperature measurement node (4) can be pressed on blank (11) upper surface between described temperature measurement node (4) and the movable plate (6).
2. the attemperating unit of travelling stock in the intermediate frequency diathermic furnace according to claim 1, it is characterized in that: described hold down gag is meant, the top of described temperature measurement node (4) is fixed with ceramic washer I (8), vertically being provided with and the fixing ceramic washer II (9) of movable plate (6) of described thermocouple wire (2) to the top of part, be provided with stage clip (10) between described ceramic washer I (8) and the ceramic washer II (9), described thermocouple wire (2) vertically run through ceramic washer II (9), stage clip (10) and ceramic washer I (8) from top to bottom successively to part.
3. the attemperating unit of travelling stock in the intermediate frequency diathermic furnace according to claim 1 is characterized in that: described temperature measurement node (4) is for hemispherical, and the upper surface shape of the lower surface of described temperature measurement node (4) and blank (11) is coincide.
4. the attemperating unit of travelling stock in the intermediate frequency diathermic furnace according to claim 1, it is characterized in that: described lateral part is fixed on the movable plate (6) and is meant, described movable plate (6) is a hollow structure, described two thermocouple wires (2) are wrapped with the glass wool cloth of one deck high-temperature insulation thermal insulation, and the lateral part of every thermocouple wire (2) is positioned between the glass wool cloth of the hollow bulb of movable plate (6) and lateral part and the movable plate (6) and is filled with fire clay.
5. according to the attemperating unit of travelling stock in any one described intermediate frequency diathermic furnace in the claim 1～4, it is characterized in that: described guide rail (5), movable plate (6), baffle plate (7), stage clip (10) all are that non-magnet_conductible material constitutes.
6. the attemperating unit of travelling stock in the intermediate frequency diathermic furnace according to claim 5 is characterized in that: described non-magnet_conductible material is magnetic stainless steel not.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009201925606U CN201482890U (en) | 2009-08-26 | 2009-08-26 | Temperature control device of moving blanks in intermediate frequency diathermic furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201925606U CN201482890U (en) | 2009-08-26 | 2009-08-26 | Temperature control device of moving blanks in intermediate frequency diathermic furnace |
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| CN201482890U true CN201482890U (en) | 2010-05-26 |
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| CN2009201925606U Expired - Fee Related CN201482890U (en) | 2009-08-26 | 2009-08-26 | Temperature control device of moving blanks in intermediate frequency diathermic furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648251B (en) * | 2009-08-26 | 2011-07-20 | 浙江大学宁波理工学院 | Temperature control device and temperature control method of movable blank inside intermediate-frequency diathermanous furnace |
| CN103488212A (en) * | 2012-06-14 | 2014-01-01 | 北京理工大学 | Micro-droplet temperature varying experimental device |
| CN105091585A (en) * | 2015-01-21 | 2015-11-25 | 湖北文理学院 | Medium-frequency power supply furnace provided with thermodetector |
-
2009
- 2009-08-26 CN CN2009201925606U patent/CN201482890U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648251B (en) * | 2009-08-26 | 2011-07-20 | 浙江大学宁波理工学院 | Temperature control device and temperature control method of movable blank inside intermediate-frequency diathermanous furnace |
| CN103488212A (en) * | 2012-06-14 | 2014-01-01 | 北京理工大学 | Micro-droplet temperature varying experimental device |
| CN105091585A (en) * | 2015-01-21 | 2015-11-25 | 湖北文理学院 | Medium-frequency power supply furnace provided with thermodetector |
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| GR01 | Patent grant | ||
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Granted publication date: 20100526 Termination date: 20120826 |