CN211240130U

CN211240130U - Overtemperature alarm and automatic electric heater RL temperature control circuit of plastic pipe hot melter

Info

Publication number: CN211240130U
Application number: CN201922193910.7U
Authority: CN
Inventors: 来宣传
Original assignee: Hangzhou Shenmao Industrial Co ltd
Current assignee: Hangzhou Shenmao Industrial Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-08-11
Anticipated expiration: 2029-12-10

Abstract

The utility model discloses a belong to hot melt ware temperature control circuit technical field, specifically be plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit, including inductance L1, resistance R1-R21, electric capacity C1-C3, operational amplifier A1-A4, photoelectric coupler 3083, buzzer Speaker, diode D1-D7, triode Q1-Q4, Relay Relay, temperature sensor M, electric heater RL and silicon controlled rectifier Q5, this technique adopts Relay polyphone in the silicon controlled rectifier return circuit after secondary protection and introduction operational amplifier A4, diode D2 makes the Relay disconnection can not automatic recovery, effectual protection burns out electric heater RL because of the overtemperature that the silicon controlled rectifier false triggering arouses like this, the mesh of protection has been reached.

Description

Overtemperature alarm and automatic electric heater RL temperature control circuit of plastic pipe hot melter

Technical Field

The utility model relates to a hot melt ware temperature control circuit technical field specifically is plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit.

Background

Along with the popularization and application of domestic plastic pipelines, the application of a plastic pipeline hot melting technology is more and more extensive, and the most applied hot melting device temperature control in the current market adopts a liquid swelling type mechanical contact temperature control, and the temperature control has the defects of large control temperature difference, short contact service life and the like. The other type is that the electronic circuit and the bidirectional thyristor are adopted to replace the expansion type temperature control of the liquid to control the temperature of the hot melt device, the temperature difference is reduced, the service life is greatly prolonged, but the domestic power grid is seriously polluted. The thyristor is easy to trigger by mistake, and the heating plate of the hot melt device is easy to burn out due to overhigh long-term electrifying temperature.

SUMMERY OF THE UTILITY MODEL

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the above and/or other problems that exist in the prior art thermal melter temperature control circuits.

Therefore, the utility model aims at providing a plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit can reduce the condition emergence that the silicon controlled rectifier triggered by mistake, prevents that the too high condition that causes the hot melt ware hot plate to burn out of long-term circular telegram temperature from taking place.

For solving the technical problem, according to the utility model discloses an aspect, the utility model provides a following technical scheme:

the plastic pipe hot-melting device overtemperature alarm and automatic electric heater RL temperature control circuit comprises an inductor L1, resistors R1-R21, capacitors C1-C3, an operational amplifier A1-A4, a photoelectric coupler 3083, a buzzer, diodes D1-D7, triodes Q1-Q4, a Relay Relay, a temperature sensor M, an electric heater RL and a silicon controlled rectifier Q5, wherein the input end of the inductor L1 is connected with a mains supply of 220v, the output end of the inductor L1 is connected with a resistor R19 and a capacitor C1 in series, the output end of the capacitor C1 is connected to a rectifying and filtering circuit, the rectifying and filtering circuit is formed by connecting diodes D1-D1 in parallel, the rectifying and filtering circuit is connected with a voltage stabilizing circuit through a resistor R1, the voltage stabilizing circuit is formed by a resistor R1, a cold end of the resistor R1, a thermocouple The capacitor C3 filters the voltage A which is in direct proportion to the temperature, the resistors R10-R12 form a temperature set value circuit B and an overtemperature set value circuit C, and the operational amplifier A2 is connected with a controllable silicon Q5 through a resistor R14, a triode Q1 and a photoelectric coupler 3083.

As a preferred scheme of plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit, wherein: the buzzer Speaker and the heating circuit are composed of a triode Q2-Q3, a resistor R15, a resistor R16, an operational amplifier A1, an operational amplifier A4 and diodes D2-D3.

As a preferred scheme of plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit, wherein: the third pin of the triode Q4 in the voltage stabilizing circuit is connected between the resistor R21 and the resistor R20.

As a preferred scheme of plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit, wherein: one end of the electric heater is connected with a 220v power supply, the other end of the electric heater is connected with a controllable silicon Q5, and the on-off of the controllable silicon Q5 is determined by a triode Q1-Q3, an operational amplifier A1, a diode D2, an operational amplifier A4 and a photoelectric coupler 3083.

Compared with the prior art: the most applied hot melt device in the current market adopts liquid expansion type mechanical contact temperature control, and the temperature control has the defects of large control temperature difference, short contact service life and the like. The other type is that the electronic circuit and the bidirectional thyristor are adopted to replace the expansion type temperature control of the liquid to control the temperature of the hot melt device, the temperature difference is reduced, the service life is greatly prolonged, but the domestic power grid is seriously polluted. The technology adopts the relay to be connected in series in the controlled silicon loop for secondary protection and introduces the operational amplifier A4 and the diode D2 as a positive feedback circuit to ensure that the relay cannot automatically recover after being disconnected, thereby effectively protecting the over-temperature caused by the false triggering of the controlled silicon from burning out the electric heater RL and achieving the purpose of protection.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor. Wherein:

fig. 1 is a schematic structural view of the overtemperature alarm and automatic electric heater RL temperature control circuit of the plastic pipe hot melting device of the present invention.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways than those specifically described herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, for convenience of explanation, the sectional view showing the device structure will not be enlarged partially according to the general scale, and the schematic drawings are only examples, and should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

The utility model provides a plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit, please refer to fig. 1, including inductance L1, resistance R1-R21, electric capacity C1-C3, operational amplifier A1-A4, photocoupler 3083, bee calling organ Speaker, diode D1-D7, triode Q1-Q4, Relay Relay, temperature sensor M, electric heater RL and silicon controlled rectifier Q5, 220v commercial power is connected to inductance L1 input, inductance L1's output series connection resistance R19 and electric capacity C1, electric capacity C1 output connection is on the rectification filter circuit, the rectification filter circuit comprises diode D4-D7 parallelly connected, the rectification filter circuit passes through resistance R18 and is connected with voltage stabilizing circuit, voltage stabilizing circuit comprises resistance R21 and resistance R20 and triode Q20, temperature sensor M adopts K type to gather temperature control thermocouple R20-D20 and the cold junction compensation diode 20D 20 A3 is used for amplifying small signal, and is filtered by a resistor R9 and a capacitor C3 to obtain a voltage A which is in direct proportion to temperature, the resistors R10-R12 form a temperature set value circuit B and an overtemperature set value circuit C, and the operational amplifier A2 is connected with a controllable silicon Q5 through a resistor R14, a triode Q1 and a photoelectric coupler 3083.

Referring to fig. 1 again, the buzzer Speaker and the heating circuit are composed of a transistor Q2-Q3, a resistor R15, a resistor R16, an operational amplifier a1, an operational amplifier a4, and a diode D2-D3.

Referring again to FIG. 1, the third pin of the transistor Q4 of the voltage regulator circuit is connected between the resistor R21 and the resistor R20.

Referring to fig. 1 again, one end of the electric heater is connected to a 220v power supply, the other end of the electric heater is connected to a thyristor Q5, and the on/off of the thyristor Q5 is determined by a transistor Q1-Q3, an operational amplifier a1, a diode D2, an operational amplifier a4 and a photoelectric coupler 3083.

In the specific use process:

case 1: when the voltage of point A is less than B, 7 pins output a high-level triode Q1 to turn on a photoelectric coupler 3083 to trigger a silicon controlled transistor Q5 to turn on an electric heater for heating, and 14 pins output a low-level triode Q2 to turn off a buzzer to sound. A 14 pin is inverted to a rear 1 pin through an operational amplifier A1 to output a high-level triode Q3 to conduct a Relay pull-in electric heater RL for electrifying and heating;

case 2: when the voltage at the point B is more than A and less than C, the 7-pin output low-level triode Q1 is cut off, the photoelectric coupler 3083 does not trigger the controlled silicon Q5, the electric heater RL does not heat, and the output states of the operational amplifier A4 and the operational amplifier A1 are unchanged;

case 3: when a power grid interference silicon controlled rectifier Q5 exists, the Relay Relay is pulled-in silicon controlled rectifier Q5 to be triggered and conducted by mistake, so that the electric heater RL continuously heats the potential at the point A to rise, when the potential at the point A is larger than the potential at the point C, the operational amplifier A4 reversely outputs a high level, under the action of positive feedback of a diode D2, a pin 14 of the operational amplifier A4 always outputs a high level triode Q2 to conduct a buzzer for long ringing, a pin 14 outputs a low level through a pin 1 of the operational amplifier A1, the triode Q3 is cut off, the Relay Relay is disconnected, and the Relay is connected in a silicon controlled rectifier heating loop in series to enable the power failure of the electric heater RL to achieve an over-temperature power-off state, so that the heating plate is protected.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the disclosed embodiments of the present invention can be used in any combination with each other, and the non-exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. Plastics tubular product hot melt ware overtemperature alarm and automatic electric heater RL temperature control circuit, its characterized in that: the temperature-sensing constant-temperature constant-current power supply comprises an inductor L1, resistors R1-R21, capacitors C1-C3, an operational amplifier A1-A4, a photoelectric coupler 3083, a buzzer, diodes D1-D7, triodes Q1-Q4, a Relay Relay, a temperature sensor M, an electric heater RL and a silicon controlled rectifier Q5, wherein the input end of the inductor L1 is connected with 220v commercial power, the output end of the inductor L1 is connected with a resistor R1 and a capacitor C1 in series, the output end of the capacitor C1 is connected to a rectification filter circuit, the rectification filter circuit is formed by connecting diodes D1-D1 in parallel, the rectification filter circuit is connected with a voltage stabilizing circuit through a resistor R1, the voltage stabilizing circuit is formed by a resistor R1, a resistor R1 and a triode Q1, the temperature sensor M adopts a K-type thermocouple to collect temperature control, the temperature is compensated by the resistor R1-R1 and the diode D1, the cold end of the operational amplifier is integrated with the temperature of the cold end of the operational amplifier A1 and the, the resistors R10-R12 form a temperature set value circuit B and an overtemperature set value circuit C, and the operational amplifier A2 is connected with the controllable silicon Q5 through the resistor R14, the triode Q1 and the photoelectric coupler 3083.

2. The plastic pipe hot melt device overtemperature alarm and automatic electric heater RL temperature control circuit of claim 1, which is characterized in that: the buzzer Speaker and the heating circuit are composed of a triode Q2-Q3, a resistor R15, a resistor R16, an operational amplifier A1, an operational amplifier A4 and diodes D2-D3.

3. The plastic pipe hot melt device overtemperature alarm and automatic electric heater RL temperature control circuit of claim 1, which is characterized in that: the third pin of the triode Q4 in the voltage stabilizing circuit is connected between the resistor R21 and the resistor R20.

4. The plastic pipe hot melt device overtemperature alarm and automatic electric heater RL temperature control circuit of claim 1, which is characterized in that: one end of the electric heater is connected with a 220v power supply, the other end of the electric heater is connected with a controllable silicon Q5, and the on-off of the controllable silicon Q5 is determined by a triode Q1-Q3, an operational amplifier A1, a diode D2, an operational amplifier A4 and a photoelectric coupler 3083.