CN210862274U - Electric furnace temperature detection device based on PLC control - Google Patents
Electric furnace temperature detection device based on PLC control Download PDFInfo
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- CN210862274U CN210862274U CN201920446849.XU CN201920446849U CN210862274U CN 210862274 U CN210862274 U CN 210862274U CN 201920446849 U CN201920446849 U CN 201920446849U CN 210862274 U CN210862274 U CN 210862274U
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Abstract
The utility model relates to an electric stove temperature detection device based on PLC control, which comprises an electric stove, a first power supply, a PLC programmable controller, a second power supply and a thermal resistor, wherein the thermal resistor sends signals to the PLC programmable controller, the PLC programmable controller processes and converts electric signals, produces temperature signals and compares the temperature signals with set temperature range parameters to judge whether the temperature is ultrahigh, the PLC programmable controller controls a relay switch to make corresponding action according to the judgment result, the PLC programmable controller can adjust the judgment standard through inputting parameters, moreover, the range of an independent position can be set, so that hardware does not need to be replaced when the monitoring temperature needs to be adjusted, and only parameters need to be adjusted, so that the temperature monitoring device is more convenient to use, realizes the separation of temperature measurement and temperature judgment, and enables the monitoring to be more accurate.
Description
Technical Field
The utility model belongs to the technical field of the transmission shaft forging technique and specifically relates to an electric stove temperature-detecting device based on PLC control is related to.
Background
In the forging production, the purpose of heating the metal blank before forging is as follows: the plasticity of the metal is improved, the deformation resistance is reduced, namely the forgeability of the metal is increased, so that the metal is easy to flow and form, and the forge piece obtains good structure and mechanical property. The heating method of the metal blank can be divided into two major categories of fuel heating and electric heating according to different heat sources. The electric heating has the advantages of high heating speed, accurate furnace temperature control, good heating quality, less workpiece oxidation, good labor condition and the like, is suitable for being used in mass production, has small influence on the environment, and is more and more widely applied to the production of die forgings. The electric induction heating speed in the electric heating is very high, the less oxidation heating can be realized without protective atmosphere, and the electric heating device is suitable for production lines. According to the heatable blank specification enclosure, the company selects a medium-frequency induction electric heating mode.
In the working process of the medium-frequency induction furnace, three-phase power-frequency alternating current needs to be rectified and then converted into direct current, and then the direct current is converted into adjustable medium-frequency alternating current. When the medium-frequency alternating current passes through an induction coil in a hearth of the electric furnace, an alternating magnetic field is generated, and alternating potential is generated inside a metal blank placed in the alternating magnetic field and forms alternating eddy current. The resistance of the metal blank can cause eddy current heating and magnetic hysteresis loss heating, so that the blank is heated, the temperature is raised, and finally the raw material is heated to the temperature required by the forging process. In the actual working process, the temperature of the current conversion device and the temperature of the induction coil of the electric furnace can be increased, and when the temperature exceeds the specified temperature range, the equipment can not work normally and can be damaged. In order to ensure the normal operation of the electric furnace, cooling water is needed to be used for carrying out cooling treatment on the current conversion device, the induction coil and the like in production. However, in the operation of the circulating water path, scale formation and impurity electrolysis can occur, which causes unsmooth water flow, thereby causing high temperature of equipment, even causing damage of the controllable silicon and bursting of the water pipe, and causing damage of the line. Therefore, it is necessary to install a temperature monitoring system for the electric furnace to monitor the temperature of the relevant portion, and the electric furnace should be turned off once the temperature exceeds a specified range, so as to prevent the electric furnace from being damaged.
The original electric furnace temperature monitoring system mainly uses temperature control switches as temperature measurement and judgment elements, wherein the temperature control switches are used in series, when the temperature of the part where one temperature control switch is located exceeds a safety range, the temperature control switches are disconnected, the whole temperature measurement circuit is powered off, and a relay is enabled to disconnect a main circuit of an electric furnace and give an alarm. Through use, the design is found to have the following problems:
1. each temperature control switch corresponds to a fixed temperature, and the temperature switch must be replaced when the monitored temperature needs to be adjusted, so that the operation is complicated, and the cost is high;
2. the temperature control switch is arranged on a cooling circulating water pipeline of the equipment and replaces the temperature of the monitoring equipment with the monitored water temperature, so that false alarm can occur, and the electric furnace is damaged, for example, when the cooling water switch is not turned on, the electric furnace is high in temperature due to no cooling, but the temperature control switch is judged to be normal due to no water flow;
3. the temperature control switches are arranged in series, and when one switch or a plurality of switches are switched off, the relay can be actuated, so that the electric furnace circuit is switched off. Therefore, when a problem occurs, the specific position with ultrahigh temperature cannot be judged, and the specific position needs to be checked one by one, so that the working difficulty of a maintainer is increased, and the production efficiency is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed against, provide an electric stove temperature-detecting device based on PLC control, the thermal resistance sends the signal to PLC programmable controller, PLC programmable controller handles the conversion to the signal of telecommunication, PLC programmable controller judges and makes corresponding action according to judged result control relay switch, judges separately temperature measurement and temperature, makes the monitoring more accurate.
In order to solve the technical problem, the utility model discloses a technical scheme is: an electric furnace temperature detection device based on PLC control comprises an electric furnace, a first power supply, a PLC programmable controller, a second power supply and a thermal resistor, wherein the first power supply is 380V alternating current and is electrically connected with the electric furnace through a main loop terminal of a relay switch so as to provide electric energy for the electric furnace; the second power supply is 220V alternating current and is electrically connected with the PLC for supplying electric energy to the PLC; the thermal resistors are respectively installed at different positions of the electric furnace and connected in parallel to be electrically connected with the input terminal of the PLC through a lead correspondingly so as to transmit the detected temperature of the electric furnace to the PLC, and the output terminal of the PLC is electrically connected with the coil terminal of the relay switch through a lead so as to control the action of the relay switch.
As a further improvement of the electric furnace temperature detection device based on PLC control, the electric furnace is an intermediate frequency electric furnace.
As the utility model relates to an electric stove temperature-detecting device's further improvement based on PLC control, the thermal resistance is PT100 thermal resistance.
As the utility model relates to an electric stove temperature-detecting device's further improvement based on PLC control, the thermal resistance sets up 5~ 10.
As the utility model relates to an electric stove temperature-detecting device's further improvement based on PLC control, PLC programmable controller configuration display screen.
Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:
1. the utility model relates to an electric stove temperature-detecting device based on PLC control, the thermal resistance sends the signal to PLC programmable controller, PLC programmable controller handles the conversion to the signal of telecommunication, produce temperature signal and contrast with the temperature range parameter of settlement, judge whether the temperature is super high, PLC programmable controller makes corresponding action according to the result of judgement control relay switch, PLC programmable controller can adjust the judgement standard through input parameter, and can carry out the scope settlement to an individual position, just need not change the hardware when needing to adjust monitoring temperature like this, only need adjust the parameter just, and is more convenient, realize that temperature measurement and temperature judgement are separated, make the monitoring also more accurate;
2. the utility model relates to an electric stove temperature-detecting device based on PLC control, the thermal resistance is directly laid at the position that needs to be measured, and the temperature measurement precision of thermal resistance is higher than the temperature control switch precision that uses in the prior art, so the measuring result of the device is more reliable, simultaneously, PLC programmable controller has fine expansibility, under the condition that interface quantity satisfies, can increase the measuring point to guarantee the measuring effect;
3. the utility model relates to an electric stove temperature-detecting device based on PLC control, PLC programmable controller configuration display screen, the staff can look over the measured temperature of every thermal resistance, according to the actual temperature condition, the staff in order to discover abnormal conditions in advance and handle, can reduce the down time of electric stove, improve production efficiency, when the temperature appears unusually, can know the concrete position that equipment broke down through looking over PLC programmable controller, made things convenient for the overhaul of the equipments work greatly;
4. the utility model relates to an electric stove temperature-detecting device based on PLC control, thermal resistance are parallelly connected, are mutually independent between the thermal resistance promptly, have avoided the mutual interference between the temperature element, have improved the reliability of device.
Drawings
Fig. 1 is a schematic structural view of the temperature monitoring device of the present invention;
FIG. 2 is a schematic diagram of a prior art temperature monitoring device;
the labels in the figure are: 1. the electric stove 2, the first power, 3, PLC programmable controller, 4, the second power, 5, the thermal resistance, 6, relay switch.
Detailed Description
As shown in fig. 1 and 2, an electric furnace temperature detection device based on PLC control includes an electric furnace 1, a first power supply 2, a PLC programmable controller 3, a second power supply 4, and a thermal resistor 5, wherein the first power supply 1 is 380V ac and is electrically connected to the electric furnace 1 through a main loop terminal of a relay switch 6 to provide electric energy to the electric furnace 1; the second power supply 4 is 220V alternating current and is electrically connected with the PLC 3 to provide electric energy for the PLC 3; the thermal resistors 5 are respectively installed at different positions of the electric furnace 1, connected in parallel and correspondingly electrically connected with the input terminal of the PLC programmable controller 3 through a lead wire, so that the detected temperature of the electric furnace 1 is transmitted to the PLC programmable controller 3, and the output terminal of the PLC programmable controller 3 is electrically connected with the coil terminal of the relay switch 6 through a lead wire so as to control the action of the relay switch 6.
When the temperature monitoring device works, the thermal resistor 5 sends a signal to the PLC 3, the PLC 3 processes and converts an electric signal, a temperature signal is produced and compared with a set temperature range parameter, whether the temperature is ultrahigh is judged, the PLC 3 controls the relay switch 6 to perform corresponding action according to a judgment result, the PLC 3 can adjust a judgment standard through inputting the parameter, and can set a range of an independent position, so that hardware does not need to be replaced when the monitoring temperature needs to be adjusted, only the parameter needs to be adjusted, the temperature monitoring device is more convenient, temperature measurement and temperature judgment are separated, and monitoring is more accurate;
the thermal resistor 5 is a thermal resistor with a Pt100 specification, the thermal resistor 5 is directly arranged at a position to be measured, and the temperature measurement precision of the thermal resistor 5 is higher than that of a temperature control switch used in the prior art, so that the measurement result of the device is more reliable, meanwhile, the PLC 3 has good expansibility, under the condition that the number of interfaces is met, the measurement points can be increased to ensure the measurement effect, and 5-10 thermal resistors 5 can be ensured; and the thermal resistors 5 are connected in parallel, namely the thermal resistors 5 are mutually independent, so that mutual interference among temperature measuring elements is avoided, and the reliability of the device is improved.
Wherein PLC programmable controller 3 disposes the display screen, and the measurement temperature of every thermal resistance 5 can be looked over to the staff, and according to the temperature condition of reality, the staff can reduce the down time of electric stove 1 in order discovering the abnormal conditions in advance and handling, improves production efficiency, and when the temperature appears unusually, can know the concrete position that equipment broke down through looking over PLC programmable controller 3, made things convenient for the overhaul of the equipments work greatly.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.
Claims (4)
1. The utility model provides an electric stove temperature-detecting device based on PLC control which characterized in that: the electric furnace comprises an electric furnace (1), a first power supply (2), a PLC (programmable logic controller) (3), a second power supply (4) and a thermal resistor (5), wherein the first power supply (2) is 380V alternating current and is electrically connected with the electric furnace (1) through a main loop terminal of a relay switch (6) so as to provide electric energy for the electric furnace (1); the second power supply (4) is 220V alternating current and is electrically connected with the PLC (3) to provide electric energy for the PLC (3); the plurality of thermal resistors (5) are respectively installed at different positions of the electric furnace (1), are connected in parallel and are correspondingly and electrically connected with an input terminal of the PLC (3) through a lead so as to transmit the detected temperature of the electric furnace (1) to the PLC (3), and an output terminal of the PLC (3) is electrically connected with a coil terminal of the relay switch (6) through a lead so as to control the action of the relay switch (6);
and the PLC (3) is configured with a display screen.
2. The electric furnace temperature detection device based on PLC control according to claim 1, characterized in that: the electric furnace (1) is a medium-frequency electric furnace.
3. The electric furnace temperature detection device based on PLC control according to claim 1, characterized in that: the thermal resistor (5) is a PT100 thermal resistor.
4. The electric furnace temperature detection device based on PLC control according to claim 1, characterized in that: the number of the thermal resistors (5) is 5-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920446849.XU CN210862274U (en) | 2019-04-03 | 2019-04-03 | Electric furnace temperature detection device based on PLC control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920446849.XU CN210862274U (en) | 2019-04-03 | 2019-04-03 | Electric furnace temperature detection device based on PLC control |
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| CN210862274U true CN210862274U (en) | 2020-06-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683061A (en) * | 2020-12-15 | 2021-04-20 | 浙江天能新材料有限公司 | Control method for electric heating of low-temperature carbonization furnace |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683061A (en) * | 2020-12-15 | 2021-04-20 | 浙江天能新材料有限公司 | Control method for electric heating of low-temperature carbonization furnace |
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