CN212567717U

CN212567717U - Intelligent temperature sensor device with RS485 output

Info

Publication number: CN212567717U
Application number: CN202021634368.0U
Authority: CN
Inventors: 潘胤飞
Original assignee: Suzhou Banshan Intelligent Technology Co Ltd
Current assignee: Suzhou Banshan Intelligent Technology Co Ltd
Priority date: 2020-08-08
Filing date: 2020-08-08
Publication date: 2021-02-19
Anticipated expiration: 2030-08-08

Abstract

The intelligent temperature sensor device with RS485 output comprises a voltage-stabilized power supply, a thermistor, a singlechip module, a GPRS module, a detection circuit and a prompt circuit; two thermistors are provided; the stabilized voltage supply, the detection circuit, the singlechip module, the GPRS module and the prompt circuit are arranged in the element box; and is electrically connected with the thermistor. This novel application can be with data transfer to the distal end through wireless mobile network to the temperature data of on-the-spot collection, the user of arbitrary position can be through the temperature data of two thermistor collections of audio-visual grasp such as cell-phone oscillogram, and compare, when the temperature data of two thermistor collections equal when being close, represent normal work, when the temperature data difference is big, the user can obtain visual suggestion and has the thermistor problem to appear, and detection circuitry can also be at the on-the-spot output alarm signal of data difference when big, the user can in time detect thermistor and change the thermistor of damage, production facility can normally work has been guaranteed.

Description

Intelligent temperature sensor device with RS485 output

Technical Field

The utility model relates to a temperature sensor technical field, especially an intelligent temperature sensor device of taking RS485 output.

Background

Thermistor-based temperature sensors are often used in areas where accurate temperature sensing is required due to their high sensitivity to sensing temperature. The existing thermistor is used for temperature measurement, and one thermistor is adopted for measuring the temperature on site. In practical application, after thermistor performance drops or even damages, as long as the performance of thermistor is not detected actively (for example, the resistance meter is adopted for detection), the user generally can not know that the thermistor has a problem (the user watches the temperature based on the display screen connected with the thermistor and the like, and as long as the temperature number is not very large, the user generally can not know that the thermistor has a problem), and the influence can be brought to the normal work of the production equipment based on the detection temperature control (for example, the abnormal working temperature of the production equipment is higher than a certain value, but the operator watches the temperature data collected by the thermistor after the problem appears, and the display temperature is normal, so the erroneous judgment can be caused, and the damage of the production equipment and the product is possibly caused by overhigh temperature).

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects that the temperature of the field is measured by adopting one thermistor, when the performance of the thermistor is reduced or even damaged, as long as a user does not actively detect the performance of the thermistor, the user cannot know that the thermistor has problems and can bring influence on the normal work of production equipment based on temperature control, the utility model provides a temperature acquisition probe which adopts two thermistors, and under the action of a singlechip, a GPRS module and the like in application, the temperature data acquired in the field can be transmitted to a far end through a wireless mobile network, so that a powerful technical support is provided for the user at any position to intuitively master the temperature data acquired by the two thermistors through a mobile phone oscillogram and the like under the support of the prior mature technology and compare the data, when the temperature data acquired by the two thermistors are equal and close, the representative work is normal, when the temperature data difference is big, the user can obtain the visual suggestion and have had the thermistor problem, and detection circuitry can also be at the on-the-spot output alarm signal of data difference when big, and the user can in time detect the thermistor and change the thermistor that damages, has guaranteed the intelligent temperature sensor device of taking RS485 output that production facility can normally work based on detecting temperature control.

The utility model provides a technical scheme that its technical problem adopted is:

the intelligent temperature sensor device with RS485 output comprises a voltage-stabilized power supply, a thermistor, a singlechip module and a GPRS module, and is characterized by also comprising a detection circuit and a prompt circuit; the number of the thermistors is two; the stabilized voltage supply, the detection circuit, the singlechip module, the GPRS module and the prompt circuit are arranged in an element box; the positive electrode of the power output end of the stabilized voltage power supply is electrically connected with one ends of the two thermistors, and the two ends of the power output of the stabilized voltage power supply are respectively and electrically connected with the two ends of the singlechip module, the GPRS module and the two ends of the input end of the power panel of the detection circuit; the other ends of the two thermistors are respectively and electrically connected with the two analog voltage signal input ends of the singlechip module and the two signal input ends of the detection circuit; the signal output end of the single chip microcomputer module is electrically connected with the signal input end of the GPRS module through the RS485 data line, and the power output end of the detection circuit is electrically connected with the power input end of the prompt circuit.

Further, the stabilized voltage supply is an alternating current to direct current switching power supply module.

Further, the thermistor is a negative temperature coefficient thermistor.

Further, the model of the main control chip of the single chip microcomputer module is STC12C5A60S 2.

Furthermore, the detection circuit comprises an operational amplifier of a model LM324, a resistor, an adjustable resistor and diodes, wherein the operational amplifier, the resistor, the adjustable resistor and the diodes are connected through circuit board wiring, one end of the resistor is connected with a pin 4 at the positive power input end of the operational amplifier, the other end of the resistor is connected with a pin 3 at the first same-direction input end, a pin 5 at the first same-direction input end and one end of the adjustable resistor of the operational amplifier, a pin 11 at the negative power input end of the operational amplifier is connected with the other end of the adjustable resistor, and two

pins

1 and 7 at the output end of the operational amplifier are.

Furthermore, the prompting circuit comprises resistors, light emitting diodes and a buzzer, one ends of the two resistors are respectively connected with the anodes of the two light emitting diodes, and the cathodes of the two light emitting diodes are connected with the power supply input end of the cathode of the buzzer.

The utility model has the advantages that: this novel two thermistors that adopt are close to respectively, install the temperature detection point position at production facility as the probe of temperature acquisition. In application, the two thermistors are influenced by heat and can respectively output an analog voltage signal to enter the single chip microcomputer module, the single chip microcomputer module transmits the analog voltage signal to the GPRS module through an RS485 data line for processing, the GPRS module can convert temperature data acquired on site into a digital signal and transmit the data to a far end through a wireless mobile network, a user at any position can visually master the temperature data acquired by the two thermistors through the display of a mobile phone oscillogram under the support of the existing mature technology and compare the temperature data, when the temperature data acquired by the two thermistors are equal and close, the user can normally work, and when the data difference is large, the user can visually prompt that the thermistors have problems. In this is novel, detection circuitry can also be at the on-the-spot output alarm signal of data difference when big, and the user can in time detect thermistor and change the thermistor that damages, has guaranteed that production facility based on detect temperature control can normally work. Based on the foregoing, the utility model discloses good application prospect has.

Drawings

The invention will be further explained with reference to the drawings and examples.

Fig. 1 is a circuit diagram of the present invention.

Fig. 2 is a block diagram illustration of the present invention.

Fig. 3 is a schematic structural diagram of the present invention.

Detailed Description

As shown in fig. 1, 2 and 3, the intelligent temperature sensor device with RS485 output includes a regulated power supply 1, a thermistor 2, a single chip microcomputer module 3, a GPRS module 4, a detection circuit 5 and a prompt circuit 6; the two thermistors 2 are respectively close to temperature detection points arranged on production equipment; the stabilized voltage supply 1, the detection circuit 5, the singlechip module 3, the GPRS module 4 and the prompt circuit 6 are arranged on a circuit board in the element box 7.

Referring to fig. 1, a regulated power supply a is a finished product of a 220V/12V/50W ac-to-12V dc switching power supply module, and has two

power input terminals

1 and 2 pins and two

power output terminals

3 and 4 pins. The thermistors T1, T2 are negative temperature coefficient thermistors of type NTC 103D. The model of the main control chip of the singlechip module A1 is STC12C5A60S 2. The GPRS module A2 is ZLAN8100 in model, and an RS485 data input port is arranged on a GPRS module finished product A2. The detection circuit comprises an operational amplifier A3 of a model LM324, a resistor R1, an adjustable resistor RP, diodes VD1 and VD2, wherein the operational amplifier A3, the resistor R1, the adjustable resistor RP, the diodes VD1 and VD2 are connected through circuit board wiring, one end of the resistor R1 is connected with a pin 4 at the positive power supply input end of an operational amplifier A3, the other end of the resistor R1 is connected with a pin 3 at the first path same-direction input end, a pin 5 at the second path same-direction input end and one end of the adjustable resistor RP, a pin 11 at the negative power supply input end of the operational amplifier A3 is connected with the other end of the adjustable resistor RP, and two

output ends

1 and 7 of the operational amplifier. The prompting circuit comprises resistors R3 and R4, light emitting diodes VL1 and VL2 (light emitting surfaces are positioned outside 2 holes at the front end of the element box) and a beeper B, one ends of the two resistors R3 and R4 are respectively connected with anodes of two light emitting diodes VL1 and VL2, and cathodes of the two light emitting diodes VL1 and VL2 are connected with a negative power supply input end of the beeper B.

As shown in FIG. 1,

pins

1 and 2 of a power input end of a regulated power supply A and two poles of an alternating current 220V power supply are respectively connected through leads. The 3 feet of the positive power output end of the voltage-stabilized power supply A are connected with one ends of two thermistors T1 and T2 through leads. The power output two

ends

3 and 4 pins of the voltage-stabilized power supply A, the power board input two

ends

3 and 4 pins (VCC and GND) of the singlechip module A1, the power board input two

ends

1 and 2 pins (VCC and GND) of the GPRS module A2, and the

pins

4 and 11 of the operational amplifier A3 at the power input two ends of the detection circuit are respectively connected through leads. The other ends of the two thermistors T1 and T2 are respectively connected with the

pins

1 and 2 of the two analog voltage signal input ends of the singlechip module A1 and the pins 2 of the first path of reverse input end and the pins 6 of the second path of reverse input end of the operational amplifier A3 of the two signal input ends of the detection circuit through leads. And the signal output end of the singlechip module A1 is connected with the signal input end of the GPRS module A2 through an RS485 data line. The negative electrodes of diodes VD1 and VD2 at the power output end of the detection circuit are connected with the positive power input end of a buzzer B at the power input end of the prompting circuit through a lead. The anodes of the diodes VD1 and VD2 are respectively connected with the other ends of the two resistors R3 and R4 of the prompting circuit through leads. The 4 feet of the negative power supply output end of the voltage-stabilized power supply A are connected with the negative power supply input ends of the annunciator B, the light-emitting diodes VL1 and VL2 through leads.

As shown in fig. 1, 2 and 3, after a 220V ac power supply enters a power supply input end of a regulated power supply a, a stable 12V power supply is output by

pins

3 and 4 of the regulated power supply a under the action of an internal circuit of the regulated power supply a and enters one ends of two thermistors T1 and T2 and power supply input ends of a single chip microcomputer module a1, a GPRS module a2 and a detection circuit, so that the circuits, the thermistors T1 and T2 are in a power-on working state. This is novel to adopt two thermistors T1, T2 as the probe of temperature acquisition, and two thermistors T1, T2 are close to the temperature detection point position of installing at production facility respectively. In application, the two thermistors T1 and T2 are influenced by heat and can respectively output analog voltage signals to enter a signal input end 1 and a signal input end 2 of the singlechip module A1; the higher the temperature is, the lower the resistance values of the two thermistors T1 and T2 are, and the higher the voltage of signals of

pins

1 and 2 of a 12V power supply which enter the singlechip module A1 after being subjected to voltage reduction and current limitation by the two thermistors T1 and T2 is; the lower the temperature is, the higher the resistance values of the two thermistors T1 and T2 are, and the lower the voltage of signals of

pins

1 and 2 entering the singlechip module A1 after the 12V power supply is subjected to voltage reduction and current limitation by the two thermistors T1 and T2 is. Under the action of an internal circuit, the singlechip module A1 converts an input analog voltage signal into a digital signal and inputs the digital signal into a signal input end of a GPRS module A2 through an RS485 data line, and under the action of an internal circuit of a GPRS module finished product A2, the GPRS module finished product A2 transmits the input digital signal out through a wireless mobile network; the user of any position is under the support of the existing mature technology (analog signal voltage is converted into digital signals through the singlechip module, and digital signals are transmitted through the GPRS module, the remote user receives data through the mobile phone APP, and the APP oscillogram display is the mature technology in the existing data transmission field), the user is connected with the GPRS module finished product A2, the APP is displayed by combining the mobile phone preinstalled with the existing oscillogram, and the APP converts the dynamically changed digital signals into oscillogram display (two groups of oscillograms respectively represent that two thermistors T1 and T2 are heated at different temperatures, and the signal voltage input to the singlechip module A1 under different resistors). Therefore, a user can visually master the temperature data collected by the two thermistors T1 and T2 through the display of the mobile phone oscillogram, and the comparison is carried out, when the temperature data collected by the two thermistors T1 and T2 are equal and close, the work is normal (the wave crests of the two oscillograms are close to be consistent), and when the data difference is large (the wave crests of the two oscillograms are not consistent), the user can visually indicate that the thermistor (T1 or T2) has a problem. The user can in time detect thermistor and change the thermistor that damages, has guaranteed that production facility based on detect temperature control can normally work.

In the detection circuit and the prompt circuit shown in fig. 1, 2, and 3, after the detection circuit is powered to operate, the potentials of the first equidirectional input pin 3 and the second equidirectional input pin 5 of the operational amplifier a3 are divided by the adjustable resistor RP and the resistor R1, and are set to be a certain voltage (for example, slightly lower than 6V, which can be specifically adjusted as required). When the two thermistors T1 and T2 are normal and are influenced by the field temperature under a certain resistance, a 12V direct-current power supply respectively reduces the voltage and limits the current through the thermistors T1 and T2 (simultaneously enters the

pins

1 and 2 of the singlechip module A1), and also respectively outputs the current to the pin 2 at the first reverse input end of the operational amplifier A3 and the pin 6 at the second reverse input end of the operational amplifier A3, when the potential is certain (such as 6V), the voltage of the pin 3 at the first non-inverting input end of the operational amplifier A2 is lower than the voltage of the pin 2 at the first reverse input end, meanwhile, the voltage of the pin 5 at the non-inverting input end of the second path of the operational amplifier A3 is lower than the voltage of the pin 6 at the inverting input end of the second path, so that under the circuit action in the operational amplifier A3, the pin 1 at the output end and the pin 7 at the output end of the operational amplifier A3 both output low levels to enter the anodes (cut off) of the diodes VD1 and VD2, and the subsequent light emitting diodes VL1 and VL2 and the buzzer B cannot work electrically. When one of the two thermistors T1 and T2 is abnormal due to a fault (the probability of two thermistors being in fault at the same time is very low, the resistance becomes large when the fault occurs), the potential of the pin 2 at the first inverting input end of the operational amplifier A3 or the potential of the pin 6 at the second inverting input end of the operational amplifier A3 is lower than a certain level (for example, lower than 6V), at the moment, the voltage of the pin 2 at the first inverting input end of the operational amplifier A3 is lower than the voltage of the pin 3 at the first non-inverting input end, or the voltage of the pin 6 at the second inverting input end of the operational amplifier A3 is lower than the voltage of the pin 5 at the second non-inverting input end, then under the action of an internal circuit of the operational amplifier A3, the pin 1 or the pin 7 at the output end of the operational amplifier A3 outputs a high level to enter the anode of the diode 1 or VD2 and simultaneously enter the other ends of the resistors R3 and R4, and when the power at the anode of the diode VD1 or VD 96, VL2 positive pole), the two light emitting diodes VL1 and VL2 will be respectively electrified and lighted, which prompts the user that one thermistor has a fault and is replaced in time (the light emitting surfaces of the two light emitting diodes VL1 and VL2 are positioned outside the front two openings of the element box, and the light emitting colors of the two light emitting diodes VL1 and VL2 are not consistent and respectively represent one thermistor). When one of the two thermistors is damaged, no matter the anode of the diode VD1 or VD2 is electrified, the high point equally enters the anode power supply input end of the buzzer B through the unidirectional conduction of the diode VD1 or VD2, the buzzer B can give out a loud prompt sound to prompt a user, the thermistor is damaged, and the on-site user can know the condition in time through the acousto-optic prompt. The user can in time detect thermistor and change the thermistor that damages, has guaranteed that production facility based on detect temperature control can normally work. In the utility model, the technical staff need set and adjust the resistance of the adjustable resistor RP according to the different field temperatures that need to be controlled, for example, the temperature that needs to be controlled on the field is 45 ℃, the voltage of the 12V power supply is 4V after the thermistor T1, T2 step-down current-limiting, then the partial pressure that just needs to adjust adjustable resistor RP, resistance R1 is slightly less than 4V, during the adjustment, the anodal pen-shape metre of voltmeter contacts adjustable resistor RP one end, between the other end of resistance R1, the negative pole contacts the negative pole power supply of constant voltage power supply, then slowly adjust the resistance of adjustable resistor RP, when adjusting to slightly less than 4V, adjustable resistor RP just adjusts required resistance. After once adjustment, no adjustment is needed as long as the control temperature is not changed. In fig. 2, the diodes VD1, VD2 are model numbers 1N 4007; the resistances of the resistors R1, R3 and R4 are respectively 10K, 1.8K and 1.8K; the model of the adjustable resistor RP is 20K (the model is adjusted to 10K); light emitting diodes VL1, VL2 are red and green light emitting diodes, respectively; the buzzer B is an active continuous sound high decibel alarm finished product with the model BJ-1.

The basic principles and essential features of the invention and the advantages of the invention have been shown and described above, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but rather can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The intelligent temperature sensor device with RS485 output comprises a voltage-stabilized power supply, a thermistor, a singlechip module and a GPRS module, and is characterized by also comprising a detection circuit and a prompt circuit; the number of the thermistors is two; the stabilized voltage supply, the detection circuit, the singlechip module, the GPRS module and the prompt circuit are arranged in an element box; the positive electrode of the power output end of the stabilized voltage power supply is electrically connected with one ends of the two thermistors, and the two ends of the power output of the stabilized voltage power supply are respectively and electrically connected with the two ends of the singlechip module, the GPRS module and the two ends of the input end of the power panel of the detection circuit; the other ends of the two thermistors are respectively and electrically connected with the two analog voltage signal input ends of the singlechip module and the two signal input ends of the detection circuit; the signal output end of the single chip microcomputer module is electrically connected with the signal input end of the GPRS module through the RS485 data line, and the power output end of the detection circuit is electrically connected with the power input end of the prompt circuit.

2. The device of claim 1, wherein the regulated power supply is an ac-to-dc switching power supply module.

3. The device as claimed in claim 1, wherein the thermistor is a negative temperature coefficient thermistor.

4. The device as claimed in claim 1, wherein the model of the main control chip of the single chip module is STC12C5a60S 2.

5. The device of claim 1, wherein the detection circuit comprises an operational amplifier of type LM324, a resistor, an adjustable resistor, and a diode, which are connected by wiring on a circuit board, one end of the resistor is connected to the positive power input terminal 4 of the operational amplifier, the other end of the resistor is connected to the first input terminal 3, the first input terminal 5, and one end of the adjustable resistor, the negative power input terminal 11 of the operational amplifier is connected to the other end of the adjustable resistor, and the two output terminals 1 and 7 of the operational amplifier are connected to the positive electrodes of the two diodes, respectively.

6. An intelligent temperature sensor with RS485 output according to claim 1, wherein the prompting circuit comprises resistors, LEDs and a buzzer, one end of each of the two resistors is connected with the positive electrodes of the two LEDs, and the negative electrodes of the two LEDs are connected with the negative power input end of the buzzer.