CN210178421U

CN210178421U - Intelligent tunnel construction safety early warning system

Info

Publication number: CN210178421U
Application number: CN201920791748.6U
Authority: CN
Inventors: Zimin Bai; 白子民
Original assignee: China Construction Seventh Engineering Division Corp Ltd
Current assignee: China Construction Seventh Engineering Division Corp Ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-03-24
Anticipated expiration: 2029-05-29

Abstract

The utility model discloses an intelligent tunnel construction safety early warning system, including on-the-spot detecting system, signal processing circuit, on-the-spot detecting system detects the direct early warning of information after signal processing circuit handles; the problem that the tunnel construction environment information is not easy to analyze and process in time when the information is abnormal is effectively solved. The utility model discloses the sensor gets into cophase proportion amplifier circuit after converting the tunnel construction environment air concentration information that detects into 0-5V voltage signal through the converter and enlargies, enlarge back signal through the comparator that stagnates late, the voltage 3.5V that corresponds with the 98 of air concentration 0.05 |, output stable high-low level, drive audible-visual warning after optoelectronic isolation, wherein the voltage change rate control that the magnification was calculated by the integrator, make in the air carbon monoxide concentration change when fast, the early warning is quicker, in order to avoid integrator frequent work, set up the voltage change rate for just being higher than 0.7V, reset circuit resets, the integrator calculates the voltage change rate once more.

Description

Intelligent tunnel construction safety early warning system

Technical Field

The utility model relates to a tunnel construction technical field, especially intelligent tunnel construction safety precaution system.

Background

The prior art discloses a safety early warning system for tunnel construction with application number 201621264393.8, tunnel construction environment information detected by a sensor and a detection device in a field detection system is transmitted to a data acquisition system, the data acquisition system is transmitted to an information early warning analysis system for analysis through a data transmission system, analysis results are respectively transmitted to a central control platform to control the data acquisition system to be opened and closed and the early warning device to be opened and closed, potential safety hazards which possibly exist can be analyzed and early warned in time, and the safety of tunnel construction is improved.

However, data received by the information early warning analysis system has a certain time delay, and data acquisition at the same time point usually adopts a first-come first-processing mode, so that once the tunnel construction environment information is abnormal, the data is not easy to be analyzed and processed in time.

Therefore, the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art existence, the utility model aims at providing an intelligence tunnel construction safety precaution system, when the effectual tunnel construction environmental information that has solved appears unusually, the difficult problem of being in time analyzed, handled.

The technical scheme for solving the problem is that the detection information of the field detection system is processed by a signal processing circuit and then is subjected to direct early warning, so that the tunnel construction environment information is immediately analyzed when the abnormal trend appears and is immediately processed when the abnormal trend appears, and the safety of tunnel construction is further improved;

the signal processing circuit comprises a resistor R1, one end of a resistor R1 is connected with a signal output by the sensor, the other end of a resistor R1 is respectively connected with one end of a grounded capacitor C1 and one end of a resistor R2, the other end of a resistor R2 is respectively connected with one end of a resistor R4 and the inverting input end of an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 is connected with the ground through a resistor R3, the output end of the operational amplifier AR1 is respectively connected with the other end of a resistor R4, one end of a resistor R5 and the negative electrode of a voltage stabilizing tube Z1, the other end of a resistor R5 is respectively connected with the drain electrode of a MOS tube T1, the source electrode of the MOS tube T1 is respectively connected with the non-inverting input end of the operational amplifier AR2 and one end of a resistor R6, the output end of the operational amplifier AR2 is respectively connected with the other end of the resistor R6 and the inverting input end of the operational amplifier AR3, an emitter of the triode Q1, the other end of the resistor R8, a collector of the triode Q1, a VCC terminal of the operational amplifier AR3, and the other end of the resistor R9 are all connected with +5V, a base of the triode Q1 is respectively connected with an output terminal of the operational amplifier AR3, one end of the resistor R9, and a pin 1 of the photocoupler U1, a pin 2 of the photocoupler U1 is connected with ground through a resistor R10, a pin 4 of the photocoupler U1 is connected with +24V, a pin 3 of the photocoupler U1 is respectively connected with one end of the resistor R11 and one end of the resistor R22, the other end of the resistor R22 is connected with a base of the triode Q3, one end of the resistor R11 and an emitter of the triode Q3 are connected with GND 3, a collector of the triode Q3 is respectively connected with a cathode of the alarm LS 3, a cathode of the red indicator LED 3, an anode of the alarm 3 and a cathode of the red indicator LED 3 are respectively connected with the power supply 3+, the power supply is connected to an alarm through a grounding resistor R11, the positive electrode of a voltage regulator Z1 is respectively connected with one end of a resistor R14 and one end of a resistor R15, the other end of the resistor R15 is respectively connected with the inverting input end of an operational amplifier AR4, one end of a resistor R17 and one end of a capacitor C4, the output end of an operational amplifier AR4 is respectively connected with the other end of a resistor R17, the other end of a capacitor C4 and one end of a resistor R18, the non-inverting input end of the operational amplifier AR4 is connected with the ground through a resistor R16, the other end of the resistor R18 is respectively connected with the positive electrode of a diode D4, one end of a resistor R4, the negative electrode of the diode D4, the non-inverting input end of the operational amplifier AR4, the inverting input end of the operational amplifier AR4 is respectively connected with one end of the grounding resistor R4 and one end of the resistor R4, the output end of the operational amplifier AR4 is respectively connected with the other end of the resistor R4, one, One end of the resistor R13, the other end of the resistor R13 are connected with the base electrode of the triode Q2, and the collector electrode of the triode Q2 is respectively connected with the other end of the resistor R14 and one end of the grounding capacitor C3.

The sensor of the utility model converts the detected air concentration information of the tunnel construction environment into a 0-5V voltage signal through the converter, then the signal enters the in-phase proportion amplifying circuit for amplification, the amplified signal passes through the hysteresis comparator, compared with the voltage 3.5V corresponding to 98% which exceeds 1.05% air allowable concentration (30 mg/m 3+30mg/m 3 x 0.05%), outputs stable high and low levels, is photoelectrically isolated by a photoelectric coupler U1 and drives acousto-optic alarm, wherein the amplification factor is controlled by the voltage change rate of 5S calculated by the integrator, so that the early warning is quicker when the concentration of carbon monoxide in the air changes quickly, in order to avoid frequent operation of the integrator, when the voltage change rate is set to be positive and is 0.7V higher than the conducting voltage of the triode Q2, the triode Q2 is conducted, the reset circuit formed by the resistor R14 and the capacitor C3 is reset, and the integrator calculates the voltage change rate again.

Drawings

Fig. 1 is a schematic diagram of the signal processing circuit according to the present invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages 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.

The intelligent tunnel construction safety early warning system comprises an on-site detection system and a data acquisition system, tunnel construction environment information detected by a sensor and a detection device in the on-site detection system is connected with the data acquisition system through a CAN bus, and the detection information of the on-site detection system is directly early warned after being processed by a signal processing circuit, so that the tunnel construction environment information is immediately analyzed when abnormal trend occurs and immediately processed when abnormal, and the tunnel construction safety is further improved.

In the second embodiment, based on the first embodiment, the signal processing circuit details the working principle of the signal processing circuit by taking the air concentration information of the tunnel construction environment detected by the sensor and the detection device in the field detection system as an example, the carbon monoxide sensor converts the air concentration information of the tunnel construction environment detected by the carbon monoxide sensor into a proportional 4-20mA current signal, the proportional 4-20mA current signal is filtered by an RC filter circuit composed of a resistor R1 and a capacitor C1, the proportional 4 mA current signal is converted into a 0-5V voltage signal by the current-voltage converter composed of an operational amplifier AR1 and a resistor R2-a resistor R4, and then one path of the proportional 0-5V voltage signal is amplified by an in-phase proportional amplifying circuit composed of an operational amplifier AR2, a resistor R5, a resistor R7 and a MOS transistor T1, wherein when the amplification factor of the other path of the proportional 80V corresponding to the air concentration of 3.3V, breakdown of a voltage regulator tube Z1, calculating a 5S internal voltage change rate by a voltage signal entering an integrator consisting of an operational amplifier AR4, a resistor R15-a resistor R17 and a capacitor C4, turning on a diode D1 when the voltage change rate is positive, amplifying the voltage change rate by an amplifying circuit consisting of an operational amplifier AR5 and a resistor R19-a resistor R21, adding the amplified voltage change rate to the grid electrode of an MOS tube T1, changing the resistance between the drain and the source of the MOS tube T1, and further changing the amplification factor, wherein in order to avoid frequent work of the integrator, the voltage change rate is positive, and when the voltage change rate is higher than the conducting voltage of a triode Q2 by 0.7V, the triode Q2 is turned on, a reset circuit consisting of a resistor R14 and a capacitor C3 is reset, the integrator calculates the voltage change rate again, the amplified signal is compared with a hysteresis comparator consisting of an operational amplifier AR3, a triode Q1, a resistor R8, a resistor R9 and a potentiometer RP1, and the comparator compares the amplified signal with a voltage of ^ 05V of more than 1.05 permitted air concentration (30 mg/m/3 +3 mg/m) and corresponding, the high level is photoelectrically isolated by a photocoupler U1 and then drives a triode Q3 to be conducted, an alarm LS1 gives an alarm, a red lamp LED1 flickers, the high level comprises a resistor R1, one end of the resistor R1 is connected with a signal output by a sensor, the other end of the resistor R1 is respectively connected with one end of a grounded capacitor C1 and one end of a resistor R2, the other end of the resistor R2 is respectively connected with one end of a resistor R4 and the inverting input end of an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 is connected with the ground through the resistor R3, the output end of the operational amplifier AR1 is respectively connected with the other end of the resistor R4, one end of the resistor R5 and the negative electrode of a voltage regulator tube Z1, the other end of the resistor R5 is respectively connected with the drain electrode of an MOS tube T1, the source electrode of the MOS tube T1 is respectively connected with the non-inverting input end of the operational, One end of a resistor R6, an output end of an operational amplifier AR2 is respectively connected with the other end of a resistor R6 and an inverting input end of an operational amplifier AR3, a non-inverting input end of an operational amplifier AR3 is respectively connected with one end of a resistor R8, an upper end and an adjustable end of a potentiometer RP1 and an emitter of a triode Q1, the other end of the resistor R8, a collector of a triode Q1, a VCC end of the operational amplifier AR3 and the other end of a resistor R9 are respectively connected with a power supply +5V, a base of a triode Q1 is respectively connected with an output end of an operational amplifier AR3, one end of a resistor R9 and a pin 1 of a photocoupler U1, a pin 2 of a photocoupler U1 is connected with the ground through a resistor R10, a pin 4 of the photocoupler U1 is connected with the power supply +24V, a pin 3 of the photocoupler U1 is respectively connected with one end of a resistor R1 and one end of a resistor R1, the other end of the resistor R1 is connected with, the collector of the triode Q3 is respectively connected with the cathode of an alarm LS1 and the cathode of a red indicator LED1, the anode of the alarm LS1 and the anode of the red indicator LED1 are respectively connected with +24V through a resistor R24 and a resistor R23, and are connected with the alarm after passing through a grounding resistor R11, the anode of a voltage regulator Z1 is respectively connected with one end of a resistor R14 and one end of a resistor R15, the other end of the resistor R15 is respectively connected with the inverting input end of an operational amplifier AR4, one end of a resistor R17 and one end of a capacitor C4, the output end of the operational amplifier AR4 is respectively connected with the other end of the resistor R4, the other end of the capacitor C4 and one end of a resistor R4, the non-inverting input end of the operational amplifier AR4 is connected with the ground through the resistor R4, the other end of the resistor R4 is respectively connected with the anode of a diode D4, one end of the resistor R4, the cathode of the diode D4 is connected with the non-inverting input end of the, One end of a resistor R20, an output end of an operational amplifier AR5 are respectively connected with the other end of a resistor R20, one end of a grounding resistor R21 and a grid electrode of an MOS transistor T1, the other end of a resistor R12 is respectively connected with one end of a grounding capacitor C2 and one end of a resistor R13, the other end of the resistor R13 is connected with a base electrode of a triode Q2, and a collector electrode of the triode Q2 is respectively connected with the other end of a resistor R14 and one end of a grounding capacitor C3.

The utility model discloses when using, the carbon monoxide sensor turns into the tunnel construction environment air concentration information that detects into proportional 4-20mA current signal, after RC filter circuit filters, get into operational amplifier AR1, the current-voltage converter that resistance R2-resistance R4 are constituteed is converted into 0-5V voltage signal, later get into operational amplifier AR2 all the way, resistance R5-resistance R7, the cophase proportion amplifier circuit that MOS pipe T1 is constituteed is enlargied, wherein the magnification is by another way when exceeding the voltage 3.3V that 80 that air tolerance (30 mg/m ^3+30mg/m ^3 x 0.05 ^) corresponds, stabilivolt Z1 punctures, voltage signal gets into operational amplifier AR4, resistance R15-resistance R17, the integrator that electric capacity C4 constitutes calculates the internal voltage change rate, for diode D1 is switched on in right time, the voltage change rate is amplified by an amplifying circuit consisting of an operational amplifier AR5 and a resistor R19-a resistor R21 and then is added to the grid of an MOS tube T1, the resistance between the drain and the source of the MOS tube T1 is changed, and further the amplification factor is changed, so that when the concentration of carbon monoxide in the air changes rapidly, the early warning is quicker, and the purpose of inverse time limit is achieved, wherein in order to avoid the frequent work of an integrator, the voltage change rate is set to be positive, and when the voltage change rate is higher than the conducting voltage of a triode Q2 by 0.7V, a triode Q2 is conducted, a reset circuit consisting of a resistor R14 and a capacitor C3 is reset, the integrator calculates the voltage change rate again, an amplified signal is compared with the voltage 3.5V corresponding to 98V which exceeds 1.05 allowed air concentration (30 mg/m 3+30mg/m 3 x 0.05) through a comparator consisting of an operational amplifier AR3, a triode Q1, a resistor R8, a resistor R9 and a potentiometer RP1, and hysteresis is carried out, and the phenomenon of unstable output high and low levels caused by tiny 0.1V fluctuation near the comparison voltage of 3.5V is eliminated, the stable high and low levels are output, the high levels are photoelectrically isolated by a photoelectric coupler U1 and then drive a triode Q3 to be conducted, an alarm LS1 alarms, and a red light LED1 flickers.

Claims

1. The intelligent tunnel construction safety early warning system comprises a field detection system and a signal processing circuit, and is characterized in that detection information of the field detection system is processed by the signal processing circuit and then is subjected to direct early warning, so that the tunnel construction environment information is immediately analyzed when an abnormal trend appears and is immediately processed when the abnormal trend appears, and the tunnel construction safety is further improved;