CN203933356U - Centreless intermediate frequency furnace and supervisory circuit - Google Patents

Centreless intermediate frequency furnace and supervisory circuit Download PDF

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Publication number
CN203933356U
CN203933356U CN201420289244.1U CN201420289244U CN203933356U CN 203933356 U CN203933356 U CN 203933356U CN 201420289244 U CN201420289244 U CN 201420289244U CN 203933356 U CN203933356 U CN 203933356U
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circuit
signal
supervisory
centreless
plc control
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CN201420289244.1U
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沈小弟
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Shanghai Zhaoli electric furnace equipment Co.,Ltd.
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SHANGHAI ZHAOLI ELECTRICAL MANUFACTURING Co Ltd
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Abstract

The utility model provides a kind of centreless intermediate frequency furnace and supervisory circuit, described supervisory circuit comprises a rectification circuit, one for being converted to voltage signal the signal processing circuit of switch controlling signal, one signal emission interface and a PLC control circuit, described rectification circuit is electrically connected on a silicon controlled voltage output end, described rectification circuit is electrically connected on described signal processing circuit, the switch controlling signal of described signal processing circuit output transfers to described PLC control circuit by signal emission interface, described PLC control circuit is electrically connected on a switching circuit and for receiving key control signal, described switching circuit is located in the power supply circuits of described induction furnace and for making described power supply circuits form loop when the closure.Described centreless intermediate frequency furnace comprises some controllable silicons and some and controllable silicon above-mentioned supervisory circuit one to one.The application can show silicon controlled operation intuitively, detects quickly and efficiently silicon controlled fault, shuts down in time the personal safety with protection equipment and operating personnel.

Description

Centreless intermediate frequency furnace and supervisory circuit
Technical field
The utility model relates to a kind of centreless intermediate frequency furnace and supervisory circuit.
Background technology
At present, controllable silicon has been widely used in the fields such as controlled rectification, AC speed regulating, DC chopped-wave, noncontacting switch and frequency conversion.It is an important component part of various thyristor installations that trigger impulse produces link, and equipment can produce the assurance that trigger impulse is normal work by designing requirement.
Yet, take induction furnace actual motion as example, due to reasons such as component wear, trigger impulse Loss happens occasionally, and this will bring harmful effect.Simultaneously along with high-power intermediate frequency power supply is constantly promoted, silicon controlled capacity (voltage, electric current) is also continuing to increase, in hot its fault of lower detection whether for like this large electric current and voltage value, the detection of determine under state in heat also becomes particularly difficult, do not have the corresponding instrument can be.There is a controllable silicon fault and do not detect and shut down in rectifier bridge or the inverter bridge when equipment simultaneously, must be by fault spread.Not only improve the damage cost of producing, and may affect operating personnel's personal safety.
Utility model content
The technical problems to be solved in the utility model is cannot detect shutdown in order to overcome induction furnace controllable silicon fault when working in prior art; induction furnace poor reliability, the low defect of fail safe; a kind of Light-Emitting Diode, signal processing circuit, signal emission interface and PLC control circuit set up is provided; can detect quickly and efficiently silicon controlled fault, safe and reliable centreless intermediate frequency furnace and supervisory circuit.
The utility model is to solve above-mentioned technical problem by following technical proposals: a kind of silicon controlled supervisory circuit, for induction furnace, its feature is, described supervisory circuit comprises that a rectification circuit, is for being converted to voltage signal signal processing circuit, a signal emission interface and a PLC (programmable logic controller (PLC)) control circuit of switch controlling signal
Described rectification circuit is electrically connected on a silicon controlled voltage output end, described rectification circuit is electrically connected on described signal processing circuit, the switch controlling signal of described signal processing circuit output transfers to described PLC control circuit by signal emission interface, described PLC control circuit is electrically connected on a switching circuit and for receiving key control signal, and described switching circuit is located in the power supply circuits of described induction furnace and for making described power supply circuits form loop when the closure.
Rectification circuit of the present utility model is connected in silicon controlled voltage output end, for gathering voltage signal.Signal processing circuit is converted to switch controlling signal by voltage signal, and described signal processing circuit can be multivibrator, but protection range of the present utility model is not limited only to this.Described signal processing circuit transforms the switch controlling signal generating and transfers to PLC control circuit by signal emission interface.
When controllable silicon is normally worked, described signal processing circuit can obtain normal voltage signal, signal processing circuit obtains making the switch controlling signal of switching circuit closure then by signal emission interface, to transfer to PLC control circuit after voltage signal is processed, PLC control circuit receiving key control signal, power supply circuits form current supply circuit, and induction furnace is normally worked.
When controllable silicon overvoltage or overcurrent puncture after conducting; signal processing circuit cannot be obtained voltage signal; the voltage signal that signal processing circuit is zero by numerical value obtains the switch controlling signal that switching circuit is disconnected after processing; then by signal emission interface, transfer to PLC control circuit; after PLC control circuit receiving key control signal; control switch circuit disconnects, and described induction furnace is shut down.
And, controllable silicon of monitor circuit monitors of the application, for comprising that a plurality of silicon controlled induction furnaces can comprise a plurality of supervisory circuits, wherein a plurality of supervisory circuits can share a PLC control circuit.
The utility model can accurately monitor silicon controlled fault in induction furnace and occur, and after a controllable silicon damages, power supply circuits can directly be stopped power supply, and avoid fault spread.
Preferably, described induction furnace is centreless intermediate frequency furnace.
Preferably, described supervisory circuit comprises the light-emitting diode group that a resistance and one is comprised of the light-emitting diode of two forward and reverse parallel connections, and described resistance and described light-emitting diode group are series between described controllable silicon and rectification circuit.
Utilize light-emitting diode, operating personnel can directly learn by light-emitting diode whether controllable silicon normally works at induction furnace, intuitive and convenient under running status.
Preferably, described signal emission interface is optical fiber emission interface.
Preferably, described signal processing circuit is NE555 (8 pin time-base integrated circuit) multivibrator.
Preferably, described supervisory circuit is located in the rectification, inversion pulse expansion plate of described centreless intermediate frequency furnace.
Circuits for triggering on rectification, inversion pulse expansion plate have Trigger Function, and supervisory circuit is located on described rectification, inversion pulse expansion plate and can be played cost-saving and space-saving effect.
The utility model also provides a kind of centreless intermediate frequency furnace, and its feature is, described centreless intermediate frequency furnace comprises some controllable silicons and some and controllable silicon supervisory circuit as above one to one.
Preferably, the PLC control circuit of whole described supervisory circuits is same PLC control circuit.That is, the public PLC control circuit of supervisory circuit.
Meeting on the basis of this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains each preferred embodiments of the utility model.
Positive progressive effect of the present utility model is: the application has structurally set up the Light-Emitting Diode that can show intuitively silicon controlled operation, and whether user can clearly observe controllable silicon and normally work.And the application added signal processing circuit, signal emission interface and PLC control circuit, can realize and detect quickly and efficiently silicon controlled fault, and shut down the personal safety with protection equipment and operating personnel in time.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the centreless intermediate frequency furnace of the utility model embodiment.
Fig. 2 is the structural representation of the supervisory circuit of the utility model embodiment.
Embodiment
Lift a preferred embodiment below, and carry out by reference to the accompanying drawings the clearer the utility model that intactly illustrates.
Embodiment
The present embodiment provides a kind of centreless intermediate frequency furnace 1, and described centreless intermediate frequency furnace 1 comprises supervisory circuit 13 and the rectification one to one of 12,6 of 6 controllable silicons and controllable silicon 12, inversion pulse expansion plate 11.
The key technical indexes of described controllable silicon 12 is as follows:
1, silicon controlled rectifier voltage/V:4000;
2, controllable silicon electric current/A:2500;
3, gate voltage/V:15;
Referring to Fig. 1, Fig. 2, each supervisory circuit 13 comprises a rectification circuit 16, a NE555 multivibrator, an optical fiber emission interface 18, a resistance 14, a light-emitting diode group 15 and a PLC control circuit 19.
Wherein, the PLC control circuit 19 of 6 supervisory circuits 13 is public, and the PLC control circuit 19 of 6 supervisory circuits 13 is same PLC control circuit 19.NE555 multivibrator 17 is a kind of preferred implementations of signal processing circuit.
Rectification circuit 16 is electrically connected on the voltage output end of a controllable silicon 12, thereby obtains the voltage signal of controllable silicon 12.
Described rectification circuit 16 is electrically connected on described NE555 multivibrator 17, voltage signal transfers to NE555 multivibrator after rectification circuit 16 rectifications, multivibrator is for voltage signal is converted to switch controlling signal, and the switch controlling signal of described NE555 multivibrator 17 outputs transfers to described PLC control circuit 19 by optical fiber emission interface 18.
Described PLC control circuit 19 is electrically connected on a switching circuit 22 and for receiving key control signal, and described switching circuit 22 is located in the power supply circuits 21 of described centreless intermediate frequency furnace 1 and for making described power supply circuits 21 form loops when the closure.That is to say that described PLC control circuit 19 controls described switching circuit 22 according to switch controlling signal, thereby the power supply circuits 21 of centreless intermediate frequency furnace 1 are disconnected or closed control.
Described light-emitting diode group 15 is comprised of the light-emitting diode of two forward and reverse parallel connections, and described resistance 14 and described light-emitting diode group 15 are series between described controllable silicon 12 and rectification circuit 16.Utilize light-emitting diode, operating personnel can directly learn by light-emitting diode whether controllable silicon 12 normally works at induction furnace, intuitive and convenient under running status.
Described supervisory circuit 13 is located in the rectification, inversion pulse expansion plate 11 of described centreless intermediate frequency furnace.Supervisory circuit 13 is located on described rectification, inversion pulse expansion plate 11 and can be played cost-saving and space-saving effect.
The course of work of the centreless intermediate frequency furnace of the present embodiment is:
When controllable silicon, press trigger impulse order normally and close in short-term, be connected in the resistance 14 of silicon controlled voltage output end by after the voltage signal step-down current limliting on controllable silicon 12, drive light-emitting diode, to show that controllable silicon 12 normally works.Voltage signal generates switch controlling signal and is used for being transferred to PLC control circuit after NE555 multivibrator 17.When controllable silicon is normally worked, NE555 multivibrator obtains making the switch controlling signal of switching circuit closure then by signal emission interface, to transfer to PLC control circuit after voltage signal is processed, PLC control circuit receiving key control signal, make power supply circuits form loop, for giving the power supply of centreless intermediate frequency furnace.
When controllable silicon overvoltage or overcurrent puncture after conducting, described NE555 multivibrator cannot collect voltage signal, the voltage signal that NE555 multivibrator is zero by numerical value obtains the switch controlling signal that switching circuit is disconnected after processing, switch controlling signal is for representing controllable silicon operation irregularity, and PLC control circuit can be using no signal input as the switch controlling signal that represents controllable silicon operation irregularity here.PLC control circuit disconnects according to switch controlling signal control switch circuit, makes power supply circuits cannot form loop, for centreless intermediate frequency furnace is shut down.
The centreless intermediate frequency furnace design of the present embodiment is simple and easy, cost-saving and circuit board space, and stoppage protection in time, the colleague that accident can further not expanded has guaranteed operating personnel's personal safety.
Although more than described embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection range of the present utility model is limited by appended claims.Those skilled in the art is not deviating under the prerequisite of principle of the present utility model and essence, can make various changes or modifications to these execution modes, but these changes and modification all fall into protection range of the present utility model.

Claims (8)

1. a silicon controlled supervisory circuit, for induction furnace, is characterized in that, described supervisory circuit comprises that a rectification circuit, is for voltage signal being converted to signal processing circuit, a signal emission interface and a PLC control circuit of switch controlling signal,
Described rectification circuit is electrically connected on a silicon controlled voltage output end, described rectification circuit is electrically connected on described signal processing circuit, the switch controlling signal of described signal processing circuit output transfers to described PLC control circuit by signal emission interface, described PLC control circuit is electrically connected on a switching circuit and for receiving key control signal, and described switching circuit is located in the power supply circuits of described induction furnace and for making described power supply circuits form loop when the closure.
2. supervisory circuit as claimed in claim 1, is characterized in that, described induction furnace is centreless intermediate frequency furnace.
3. supervisory circuit as claimed in claim 1, it is characterized in that, described supervisory circuit comprises the light-emitting diode group that a resistance and one is comprised of the light-emitting diode of two forward and reverse parallel connections, and described resistance and described light-emitting diode group are series between described controllable silicon and rectification circuit.
4. supervisory circuit as claimed in claim 1, is characterized in that, described signal emission interface is optical fiber emission interface.
5. supervisory circuit as claimed in claim 1, is characterized in that, described signal processing circuit is NE555 multivibrator.
6. supervisory circuit as claimed in claim 2, is characterized in that, described supervisory circuit is located in the rectification, inversion pulse expansion plate of described centreless intermediate frequency furnace.
7. a centreless intermediate frequency furnace, is characterized in that, described centreless intermediate frequency furnace comprises some controllable silicons and the some and controllable silicon supervisory circuit as described in any one in claim 1-6 one to one.
8. centreless intermediate frequency furnace as claimed in claim 7, is characterized in that, the PLC control circuit of whole described supervisory circuits is same PLC control circuit.
CN201420289244.1U 2014-05-30 2014-05-30 Centreless intermediate frequency furnace and supervisory circuit Active CN203933356U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420289244.1U CN203933356U (en) 2014-05-30 2014-05-30 Centreless intermediate frequency furnace and supervisory circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420289244.1U CN203933356U (en) 2014-05-30 2014-05-30 Centreless intermediate frequency furnace and supervisory circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106992499A (en) * 2016-03-22 2017-07-28 上海兆力电器制造有限公司 Controllable silicon for intermediate frequency furnace detects protection device and intermediate frequency furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106992499A (en) * 2016-03-22 2017-07-28 上海兆力电器制造有限公司 Controllable silicon for intermediate frequency furnace detects protection device and intermediate frequency furnace
CN106992499B (en) * 2016-03-22 2019-07-26 上海兆力电器制造有限公司 Silicon-controlled detection protective device and intermediate frequency furnace for intermediate frequency furnace

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Address after: 201607 No. 555, Zhongmin Road, Maogang Town, Songjiang District, Shanghai

Patentee after: Shanghai Zhaoli electric furnace equipment Co.,Ltd.

Address before: 201607 No. 555, Zhongmin Road, Maogang Town, Songjiang District, Shanghai

Patentee before: SHANGHAI ZHAOLI ELECTRICAL APPLIANCES MANUFACTURING Co.,Ltd.