CN211451817U - Tunnel type resistance furnace temperature control device - Google Patents
Tunnel type resistance furnace temperature control device Download PDFInfo
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- CN211451817U CN211451817U CN202020017232.9U CN202020017232U CN211451817U CN 211451817 U CN211451817 U CN 211451817U CN 202020017232 U CN202020017232 U CN 202020017232U CN 211451817 U CN211451817 U CN 211451817U
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Abstract
The utility model discloses a tunnel resistance furnace temperature control device, which comprises a controller, heating element and detecting element, detecting element includes the temperature sensor who is used for detecting furnace temperature, heating element includes resistance heating rod and power regulator, the controller changes the operating power of resistance heating rod through control function regulator, temperature sensor's detection signal loops through frequency-selecting noise reduction circuit and stable amplifier circuit processing, improve detection signal's precision and amplification stability effectively, the detection signal after the processing is sent into the controller after analog-to-digital conversion, the controller carries out corresponding regulation to power regulator according to the comparison difference value of the digital quantity of AD converter output and its inside temperature control setting value, thereby in time compensate the regulation when the temperature in the furnace does not reach the setting temperature within the stipulated time, make the material heat treatment process form real-time accurate monitoring link, the production quality of the tunnel resistance furnace for high-temperature firing of the ceramic material is improved.
Description
Technical Field
The utility model relates to a tunnel resistance furnace technical field especially relates to a tunnel resistance furnace temperature control device.
Background
The tunnel resistance furnace is an important device for producing microwave dielectric ceramic powder and plays a role in high-temperature sintering. The existing tunnel type resistance furnace generally comprises a tunnel type hearth, a furnace body of a heat preservation furnace wall, a resistance heating rod arranged in the hearth and a controller. In the ceramic material firing process, the temperature and time of material heat treatment need to be accurately controlled by a tunnel type resistance furnace, but at present, the heating temperature and time are controlled only by a system preset program when a resistance heating rod works specifically, a real-time and accurate monitoring link is not formed, and once the program or the heating rod breaks down, the normal operation of the firing process cannot be ensured, and the production quality of the microwave dielectric ceramic powder is influenced.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, in order to overcome the defects of the prior art, an object of the present invention is to provide a temperature control device for a tunnel resistance furnace.
The technical scheme for solving the problem is as follows: a temperature control device for a tunnel type resistance furnace comprises a controller, a heating element and a detection unit, wherein the detection unit comprises a temperature sensor for detecting the temperature of a hearth, detection signals of the temperature sensor are sequentially processed by a frequency-selecting noise reduction circuit and a stabilizing amplification circuit and then sent to an A/D converter, and the A/D converter sends the processed detection signals to the controller for comparison after analog-to-digital conversion; the heating element comprises a resistance heating rod and a power regulator, and the controller changes the working power of the resistance heating rod through controlling the function regulator.
Furthermore, the frequency-selecting noise-reducing circuit comprises a MOS tube Q1, the gate of the MOS tube Q1 is connected with the signal output end of the temperature sensor and one end of a capacitor C1 through a resistor R1, the other end of the capacitor C1 is grounded, the source of the MOS tube Q1 is grounded through a resistor R2, the drain of the MOS tube Q1 is connected with one end of an inductor L1 and a resistor R3 and the anode of a diode D1, the other end of the inductor L1 is connected with a +5V power supply, the other end of the resistor R3 is connected with one end of a capacitor C2, and the cathode of the diode D1 and the other end of the capacitor C2 are grounded through a capacitor C3 and a resistor R4 which are connected.
Further, the stabilizing amplifying circuit comprises an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to a cathode of a diode D1, an inverting input terminal of the operational amplifier AR1 is connected to one end of a resistor R5 and a capacitor C4, an output terminal of the operational amplifier AR1 is connected to the other end of the capacitor C4, one end of a resistor R6 and a collector of a triode VT1, the other end of the resistor R6 and a base of a triode VT1 are grounded through a zener diode DZ1, and an emitter of a triode VT1 is connected to the other end of a resistor R5 and an input terminal of the a/D converter and is grounded through a capacitor C5.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model adopts the temperature sensor to detect the temperature in the hearth in real time, the processed detection signal is sent into the controller after the analog-to-digital conversion, and the temperature in the hearth can not reach the set temperature in the specified time and then is compensated and adjusted in time, so that the material heat treatment process forms a real-time and accurate monitoring link, and the production quality of the tunnel type resistance furnace for high-temperature firing of ceramic materials is improved;
2. the frequency-selecting noise-reducing circuit well eliminates temperature noise by using an MOS tube and eliminates external clutter by using an LC frequency-selecting principle, so that the accuracy of temperature detection is improved;
3. the stable amplifying circuit utilizes the triode voltage stabilization principle to stabilize the output signal of the operational amplifier AR1, guarantees the stability after the detection signal is amplified, and carries out feedback adjustment on the signal after the triode voltage stabilization, effectively eliminates the signal offset voltage, and guarantees the signal amplification precision.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A temperature control device for a tunnel type resistance furnace comprises a controller, a heating element and a detection unit, wherein the detection unit comprises a temperature sensor J1 used for detecting the temperature of a hearth, detection signals of the temperature sensor J1 are sent into an A/D converter after being processed by a frequency-selecting noise reduction circuit and a stabilizing amplification circuit in sequence, and the A/D converter sends the processed detection signals into the controller for comparison after being subjected to analog-to-digital conversion. The heating element comprises a resistance heating rod and a power regulator, and the controller changes the working power of the resistance heating rod by controlling the function regulator.
During the ceramic material firing process, the temperature sensor J1 detects the temperature in the hearth in real time and converts the temperature into an electric signal to be output. Since high temperature causes noise interference to the detection signal, the output signal of the temperature sensor J1 is processed by a frequency-selective noise reduction circuit.
The frequency-selecting noise-reducing circuit comprises a MOS tube Q1, the grid of the MOS tube Q1 is connected with the signal output end of a temperature sensor J1 and one end of a capacitor C1 through a resistor R1, the other end of the capacitor C1 is grounded, the source of the MOS tube Q1 is grounded through a resistor R2, the drain of the MOS tube Q1 is connected with an inductor L1, one end of the resistor R3 and the anode of a diode D1, the other end of the inductor L1 is connected with a +5V power supply, the other end of the resistor R3 is connected with one end of a capacitor C2, and the cathode of the diode D1 and the other end of the capacitor C2 are grounded through a capacitor C3 and a resistor R686.
The output signal of the temperature sensor J1 is firstly filtered by the capacitor C1 and then sent into the MOS tube Q1 for amplification, and the MOS tube has good temperature characteristic, so that the temperature noise of the detection signal amplified by the MOS tube Q1 can be well eliminated. In addition, in the process of amplifying and outputting the MOS transistor Q1, the inductor L1 and the capacitor C2 form parallel resonance, external noise can be well eliminated by utilizing the LC frequency selection principle, for example, a large amount of electromagnetic interference generated by the resistance heating rod after being electrified influences the transmission of detection signals, and the electromagnetic interference can be effectively eliminated by LC frequency selection.
The LC filtered signal is stabilized by a capacitor C3 and then sent to a stabilizing amplifying circuit for signal amplification. The stable amplifying circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with the cathode of a diode D1, the inverting input end of the operational amplifier AR1 is connected with one end of a resistor R5 and a capacitor C4, the output end of the operational amplifier AR1 is connected with the other end of the capacitor C4, one end of the resistor R6 and the collector of a triode VT1, the other end of the resistor R6 and the base of the triode VT1 are grounded through a voltage stabilizing diode DZ1, and the emitter of the triode VT1 is connected with the other end of the resistor R5 and the input end of the A/D converter and is grounded through a capacitor C5.
In the amplification process of the operational amplifier AR1, the capacitor C4 plays a role in signal compensation, and ensures that the detection signal can be continuously and stably transmitted, the resistor R6, the triode VT1 and the voltage stabilizing diode DZ1 utilize the triode voltage stabilizing principle to stabilize the output signal of the operational amplifier AR1, and ensure the stability of the amplified detection signal, and the signal after voltage stabilization of the triode is fed back to the inverting input end of the operational amplifier AR1 through the resistor R5 to be adjusted, so that the signal offset voltage is effectively eliminated, the signal amplification precision is ensured, and finally the signal is filtered by the capacitor C5 and then is fed into the A/D converter to be subjected to analog-to-digital conversion.
The utility model discloses when specifically using, temperature sensor J1 real-time detection furnace's temperature, and loop through the frequency selection with its detected signal and fall the circuit of making an uproar and stabilize amplifier circuit and handle, improve detected signal's precision and enlarge the stability effectively, the detected signal after the processing is sent into in the controller after analog-to-digital conversion, the controller carries out corresponding regulation to the power conditioner according to the digital quantity of AD converter output and the comparative difference value of its inside control by temperature change setting value, thereby in time compensate the regulation when furnace's temperature does not reach the settlement temperature in the regulation time, make material heat treatment process form real-time accurate monitoring link, improve the production quality that tunnel resistance furnace fired ceramic material high temperature.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (3)
1. The utility model provides a tunnel resistance furnace temperature control device, includes controller, heating element and detecting element, its characterized in that: the detection unit comprises a temperature sensor for detecting the temperature of the hearth, detection signals of the temperature sensor are sequentially processed by a frequency-selecting noise reduction circuit and a stabilizing amplification circuit and then sent to an A/D converter, and the A/D converter sends the processed detection signals to a controller for comparison after analog-to-digital conversion; the heating element comprises a resistance heating rod and a power regulator, and the controller changes the working power of the resistance heating rod through controlling the function regulator.
2. The temperature control device of the tunnel resistance furnace according to claim 1, characterized in that: the frequency-selecting noise-reducing circuit comprises a MOS tube Q1, the grid of the MOS tube Q1 is connected with the signal output end of the temperature sensor and one end of a capacitor C1 through a resistor R1, the other end of the capacitor C1 is grounded, the source of the MOS tube Q1 is grounded through a resistor R2, the drain of the MOS tube Q1 is connected with one end of an inductor L1 and a resistor R3 and the anode of a diode D1, the other end of the inductor L1 is connected with a +5V power supply, the other end of the resistor R3 is connected with one end of a capacitor C2, and the cathode of the diode D1 and the other end of the capacitor C2 are grounded through a capacitor C3 and a resistor R4 which.
3. The temperature control device of the tunnel resistance furnace according to claim 2, characterized in that: the stable amplifying circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with the cathode of a diode D1, the inverting input end of the operational amplifier AR1 is connected with one end of a resistor R5 and a capacitor C4, the output end of the operational amplifier AR1 is connected with the other end of the capacitor C4, one end of the resistor R6 and the collector of a triode VT1, the other end of the resistor R6 and the base of the triode VT1 are grounded through a voltage stabilizing diode DZ1, and the emitter of the triode VT1 is connected with the other end of the resistor R5 and the input end of the A/D converter and is grounded through a capacitor C5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020017232.9U CN211451817U (en) | 2020-01-06 | 2020-01-06 | Tunnel type resistance furnace temperature control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020017232.9U CN211451817U (en) | 2020-01-06 | 2020-01-06 | Tunnel type resistance furnace temperature control device |
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| Publication Number | Publication Date |
|---|---|
| CN211451817U true CN211451817U (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020017232.9U Active CN211451817U (en) | 2020-01-06 | 2020-01-06 | Tunnel type resistance furnace temperature control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211451817U (en) |
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2020
- 2020-01-06 CN CN202020017232.9U patent/CN211451817U/en active Active
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Inventor after: Shi Gengming Inventor before: Shi Gengming |