CN213303043U

CN213303043U - Subway construction safety monitoring system

Info

Publication number: CN213303043U
Application number: CN202022529719.8U
Authority: CN
Inventors: 朱永超; 李正辉; 牛丽薇
Original assignee: Zhengzhou Railway Vocational and Technical College
Current assignee: Zhengzhou Railway Vocational and Technical College
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-05-28
Anticipated expiration: 2030-11-03

Abstract

The utility model discloses a subway construction safety monitoring system, including RFID electronic tags and RFID read-write equipment, RFID read-write equipment includes information reception processing unit and controller, information reception processing unit includes reading signal matching circuit and amplification regulating circuit, signal matching circuit is including the antenna E1 that is used for receiving RFID electronic tags information, antenna E1's output signal sends into amplification regulating circuit after LC series resonance filter and RLC matching network are handled in proper order, external noise interference is effectively eliminated, promote the validity and the transmission efficiency of information reading; the amplifying and adjusting circuit is used for amplifying the output signal of the signal matching circuit, improving the receiving accuracy and integrity of the data signal of the controller, sending the amplified signal into the controller, and sending an early warning signal to a background management center when the data information at the detection part of the controller is abnormal, so that construction emergency deployment is timely made, and the safe subway construction is effectively guaranteed.

Description

Subway construction safety monitoring system

Technical Field

The utility model relates to a construction safety monitoring technical field especially relates to a subway construction safety monitoring system.

Background

Underground railways are increasingly popular with people, subway construction is carried out in more and more cities in China in recent years, and subway lines are increased continuously. However, it should be noted that the subway construction has certain complexity and uncertainty, the demand and technology development of the subway are not harmoniously developed, and there are many problems in the subway construction, so that strict safety monitoring needs to be performed on the construction site. At present, the subway construction mainly realizes the position monitoring of personnel and equipment through RFID equipment, and the identification and the monitoring of the personnel and the equipment are completed through the distributed storage and the point-to-point transmission of the construction site location data. Because the environment in the subway construction tunnel is relatively severe and the airtightness is relatively high, the information reading failure is easily caused by the attenuation of external interference noise and signals, the integrity of subway construction data is seriously influenced, and the safety of construction is not facilitated.

So the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

To the above situation, in order to overcome the defects of the prior art, the present invention aims to provide a safety monitoring system for subway construction.

The technical scheme includes that the safety monitoring system for subway construction comprises an RFID electronic tag and an RFID read-write device, the RFID read-write device comprises an information receiving and processing unit and a controller, the information receiving and processing unit comprises a read signal matching circuit and an amplification regulating circuit, the signal matching circuit comprises an antenna E1 used for receiving information of the RFID electronic tag, an output signal of the antenna E1 is processed by an LC series resonance filter and an RLC matching network in sequence and then is sent into the amplification regulating circuit, and the amplification regulating circuit is used for amplifying the output signal of the signal matching circuit and sending the amplified signal into the controller.

Further, the LC series resonant filter comprises a capacitor C1 and an inductor L1, one end of a capacitor C1 is connected with the signal output end of the antenna E1, the other end of a capacitor C1 is connected with one end of an inductor L1, and the other end of an inductor L1 is connected with the RLC matching network.

Further, the RLC matching network comprises a resistor R1, capacitors C2, C3 and an inductor L2, wherein one ends of the resistor R1 and the capacitor C2 are connected to the other end of the inductor L1, and are connected to one end of the inductor L2 through the capacitor C3, and the other ends of the resistor R1 and the capacitor C2 and the inductor L2 are grounded in parallel.

Further, the amplification regulating circuit comprises an operational amplifier AR1, wherein a non-inverting input end of the operational amplifier AR1 is connected with one end of an inductor L1 and one ends of resistors R2 and R3, the other end of the resistor R2 is connected with a +5V power supply and a collector of a triode VT1, the other end of the resistor R3 is grounded, an inverting input end of the operational amplifier AR1 is grounded through a capacitor C4, an output end of the operational amplifier AR1 is connected with a base of a triode VT1 and a collector of the VT2, and is grounded through a resistor R4 and a capacitor C5 which are connected in parallel, an emitter of the triode VT1 is connected with the controller, and is connected with an emitter and a base of a triode VT2 through resistors R5 and R6 respectively, an emitter of the triode VT2 is grounded through a zener diode DZ1, and a base of the triode VT2 is.

Through the technical scheme, the beneficial effects of the utility model are that:

1. the antenna E1 is used for reading RFID electronic tags on constructors or construction equipment, converting the RFID electronic tags into electric signals and outputting the electric signals to the LC series resonance filter for signal filtering, so that external noise interference is effectively eliminated, and the effectiveness of information reading is improved;

2. the filtered signals are sent to an RLC matching network for impedance matching, the RLC impedance network composed of resistors, inductors and capacitors performs characteristic impedance matching on the signals, noise interference is reduced, error reading is avoided, and therefore signal transmission efficiency is improved;

3. the amplification regulating circuit utilizes an emitter follower principle to greatly improve the signal amplification efficiency, the triode VT2 plays a role of a regulating tube in the VT1 amplification process, the stable output of the triode VT1 amplified signal is ensured, the signal output waveform is effectively improved, and the accuracy and the integrity of the data signal receiving of the controller are improved.

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.

The utility model provides a subway construction safety monitoring system, including RFID electronic tags and RFID read-write equipment, RFID read-write equipment includes information receiving processing unit and controller, information receiving processing unit includes reading signal matching circuit and amplification regulating circuit, signal matching circuit includes antenna E1 that is used for receiving RFID electronic tags information, antenna E1's output signal sends into the amplification regulating circuit after LC series resonance filter and RLC matching network processing in proper order, the amplification regulating circuit is used for amplifying the output signal of signal matching circuit to send the signal after amplifying into the controller.

Further, the LC series resonant filter comprises a capacitor C1 and an inductor L1, one end of the capacitor C1 is connected with the signal output end of the antenna E1, the other end of the capacitor C1 is connected with one end of the inductor L1, and the other end of the inductor L1 is connected with the RLC matching network. When the antenna E1 reads the feedback information of the RFID electronic tag, the feedback information is firstly sent to the LC series resonance filter for signal filtering, so that the external noise interference is effectively eliminated, and the effectiveness of information reading is improved.

The filtered signals are sent to an RLC matching network for impedance matching, the RLC matching network comprises a resistor R1, capacitors C2, C3 and an inductor L2, one ends of the resistor R1 and the capacitor C2 are connected with the other end of the inductor L1 and connected with one end of the inductor L2 through the capacitor C3, and the resistor R1 and the other ends of the capacitor C2 and the inductor L2 are grounded in parallel. The RLC impedance network composed of the resistor, the inductor and the capacitor performs characteristic impedance matching on signals, reduces noise interference, avoids error reading and improves signal transmission efficiency.

The output signal of the signal matching circuit is sent to an amplification regulating circuit for amplification, the amplification regulating circuit comprises an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 is connected with one end of an inductor L1 and one end of resistors R2 and R3, the other end of a resistor R2 is connected with a +5V power supply and the collector of a triode VT1, the other end of a resistor R3 is grounded, the inverting input end of the operational amplifier AR1 is grounded through a capacitor C4, the output end of the operational amplifier AR1 is connected with the base of a triode VT1 and the collector of VT2 and is grounded through a resistor R4 and a capacitor C5 which are connected in parallel, the emitter of the triode VT1 is connected with a controller and is connected with the emitter and the base of a triode VT2 through resistors R5 and R6 respectively, the emitter of the triode VT2 is grounded through a zener diode DZ1, and the base of the triode.

In the working process of the amplification regulating circuit, the resistors R2 and R3 are connected in series to divide the +5V power supply voltage, so that bias current is applied to the output signal of the signal matching circuit, and the static working stable point in the signal amplification process is effectively improved. Then the operational amplifier AR1 amplifies the biased signal in phase, and sends the output signal of the operational amplifier AR1 to the regulator formed by the transistors VT1 and VT2 for amplification and regulation in order to avoid the misadjustment of the weak signal formed by signal attenuation during the amplification process. The triode VT1 forms an emitter follower at the output end of the operational amplifier AR1, thereby greatly improving the signal amplification efficiency, the triode VT2 plays the role of a regulating tube in the amplification process of the VT1, the output signal of the triode VT1 is sampled by shunting of the resistors R6 and R7, and the sampled signal is sent to the triode VT1 for amplification, and as the voltage stabilizing diode DZ1 plays the reference role on the potential of the emitter of the triode VT2, the waveform of the output signal of the collector of the VT2 is well improved, and the stable output of the amplified signal of the triode VT1 is ensured. Meanwhile, the resistor R4 and the capacitor C5 form RC filtering to play a role in filtering and stabilizing the base potential of the triode VT1, so that the working stability of the triode VT1 is further ensured, and the signal output waveform is effectively improved.

The utility model discloses in concrete use, antenna E1 among the RFID read-write equipment is used for reading the RFID electronic tags on constructor or the construction equipment to convert the signal of telecommunication output to LC series resonance filter and carry out signal filtering, effectively eliminate external noise interference, promote the validity that information read. The filtered signals are sent to an RLC matching network for impedance matching, the RLC impedance network composed of resistors, inductors and capacitors performs characteristic impedance matching on the signals, noise interference is reduced, error reading is avoided, and therefore signal transmission efficiency is improved. The output signal of the signal matching circuit is sent to the amplification regulating circuit for amplification, wherein the triode VT1 forms an emitter follower at the output end of the operational amplifier AR1, so that the signal amplification efficiency is greatly improved, the triode VT2 plays a role of a regulating tube in the amplification process of VT1, the stable output of the amplified signal of the triode VT1 is ensured, and the signal output waveform is effectively improved. And the output signal of the amplifying and adjusting circuit is sent to a controller for analysis and processing, so that subway construction data information is obtained. When data information at the detection position of the controller is abnormal, an early warning signal is sent to a background management center at once, so that construction emergency deployment is made in time, and subway construction safety is effectively guaranteed.

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

1. The utility model provides a subway construction safety monitoring system, includes RFID electronic tags and RFID read-write equipment, its characterized in that: the RFID read-write equipment comprises an information receiving and processing unit and a controller, wherein the information receiving and processing unit comprises a read signal matching circuit and an amplification regulating circuit, the signal matching circuit comprises an antenna E1 used for receiving RFID electronic tag information, an output signal of the antenna E1 is processed by an LC series resonance filter and an RLC matching network in sequence and then sent into the amplification regulating circuit, and the amplification regulating circuit is used for amplifying an output signal of the signal matching circuit and sending the amplified signal into the controller.

2. A subway construction safety monitoring system as claimed in claim 1, wherein: the LC series resonance filter comprises a capacitor C1 and an inductor L1, one end of the capacitor C1 is connected with the signal output end of the antenna E1, the other end of the capacitor C1 is connected with one end of the inductor L1, and the other end of the inductor L1 is connected with the RLC matching network.

3. A subway construction safety monitoring system as claimed in claim 2, wherein: the RLC matching network comprises a resistor R1, capacitors C2, C3 and an inductor L2, one ends of the resistor R1 and the capacitor C2 are connected with the other end of the inductor L1, one end of the inductor L2 is connected through the capacitor C3, and the other ends of the resistor R1 and the capacitor C2 and the other end of the inductor L2 are grounded in parallel.

4. A subway construction safety monitoring system as claimed in claim 1 or 3, wherein: the amplifying and adjusting circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with one end of an inductor L1 and one ends of resistors R2 and R3, the other end of the resistor R2 is connected with a +5V power supply and the collector of a triode VT1, the other end of the resistor R3 is grounded, the inverting input end of the operational amplifier AR1 is grounded through a capacitor C4, the output end of the operational amplifier AR1 is connected with the base of a triode VT1 and the collector of the VT2, and is grounded through a resistor R4 and a capacitor C5 which are connected in parallel, the emitter of the triode VT1 is connected with the controller, and is respectively connected with the emitter and the base of a triode VT2 through resistors R5 and R6, the emitter of the triode VT2 is grounded through a zener diode DZ1, and the base of the triode VT.