WO2016070488A1

WO2016070488A1 - On-line monitoring sonar apparatus for solid waste in sewage pipeline

Info

Publication number: WO2016070488A1
Application number: PCT/CN2015/000440
Authority: WO
Inventors: 童峰; 郭子成; 林建光
Original assignee: 环创(厦门）科技股份有限公司
Priority date: 2014-11-04
Filing date: 2015-06-23
Publication date: 2016-05-12
Also published as: CN105629243A

Abstract

An on-line monitoring sonar apparatus for a solid waste in a sewage pipeline (7), including a transmitting circuit (1), a transmitting transducer (2), a receiving transducer (3), a sound signal receiving circuit (4), an analogue-to-digital conversion module (5) and a master control module (6). By means of sound signal transmitting and receiving, signal envelope extraction and heterogeneous characteristic extraction, existence information and dimension information of the solid waste in sewage are obtained, and a result is output. The apparatus can effectively realize on-line sonar monitoring of the solid waste in the sewage pipeline (7); by means of simple and convenient sound signal continuous wave heterogeneity detection and by utilizing wide directivity, extraction of the existence information and dimension information of the solid waste in a narrow, closed and water-level changing pipeline is realized, thereby avoiding various defects of traditional visible light, electromagnetic wave and ultrasonic wave detection methods in such a usage environment; a system is convenient to be installed, used and maintained, and is low in cost; and the apparatus can be conveniently combined with a sewage smashing grille so as to form an automatic monitoring and smashing processing system for the solid waste in the sewage.

Description

On-line monitoring sonar device for solid waste in sewage pipe

Technical field

The invention belongs to the technical field of sewage pipeline monitoring, and in particular relates to an on-line monitoring sonar device for solid waste in a sewage pipe.

Background technique

At present, with the increasing impact of various types of extreme weather on the society, it is important to ensure the smooth drainage of sewage pipes. In particular, all kinds of solid waste such as cardboard, billboards, plates and trees in urban sewage seriously affect the drainage efficiency of the pumping station. It is important to set up the crushing grid at the pumping station to timely break the solid waste in the sewage pipe to ensure the smooth drainage. . However, there is currently no special device for on-line monitoring of fixed garbage in sewage pipes. Pump stations often rely on timed work and manual control to start the crushing grid, which is inefficient and cannot adapt to the sewage drainage caused by solid waste in emergencies. Blocked. The Chinese patent No. 201320053443.8 discloses a utility model patent entitled “A municipal sewage treatment system”, and the Chinese patent No. 201410136363.8 discloses an invention patent entitled “a multifunctional tracking and sampling linkage system”. Although the literature provides some technical solutions for urban sewage treatment and monitoring, it does not propose feasible technical solutions to the above problems.

Develop an on-line monitoring sonar device for on-line monitoring of solid waste in sewage pipes, and start the crushing operation by online detection of large-sized solid waste in the sewage to control the crushing grid, and improve the rapid and efficient treatment of the crushing grid of the pumping station. The ability to block all types of sewage has become an objective necessity. However, considering that the sewage in the sewage pipe is mixed with a large amount of liquid, fixed particles such as sediment, impurities, dirt, etc., the acoustic impedance is not uniform, which seriously affects the transmission of traditional light, electromagnetic waves and ultrasonic signals in the sewage; The water level of the sewer pipe in the drainage state shows a large change (the water level in the dry season is extremely low, and the flood period is full), and the various types of detection signals emitted and received in the pipe can not be kept above or below the sewage level. Due to the difference in the transmission characteristics of air and liquid, the reflection caused by the change of the liquid level between the transmitting and receiving probes will seriously affect the normal reception of light, electromagnetic waves, ultrasonic waves and other detection signals; on the other hand, due to the need to detect the approximate size of solid waste in the sewage to evaluate Whether to start the pulverizing equipment, it is extremely difficult to form a sharp directional beam in a narrow and severely reflective sewage pipe to perform acoustic signal detection with a certain spatial resolution. Therefore, it is impossible to directly detect solid waste in sewage pipes by using conventional visible light, electromagnetic wave or ultrasonic signal detecting methods or devices.

Summary of the invention

In order to solve the above problems, the present invention provides an on-line monitoring sonar device which is simple and convenient and can monitor solid waste in a sewage pipe channel online.

The above object of the present invention is achieved by the following technical solutions:

An on-line monitoring sonar device for solid waste in a sewage pipe, comprising a transmitting circuit, a transmitting transducer, a receiving transducer, An acoustic signal receiving circuit, an analog-to-digital conversion module and a main control module; the transmitting circuit generates a transmitting signal and is connected to the transmitting transducer; the transmitting transducer is installed at the bottom of the sewage pipe to emit an acoustic signal; and the receiving transducer is installed At the top of the sewage pipe, receiving an acoustic signal emitted by the transmitting transducer; the receiving circuit is connected to the receiving transducer, and the acoustic signal received by the receiving transducer is preamplified, gain controlled, bandpass filtered, and packaged. The network detection processing is transmitted to the analog-to-digital conversion module, and the analog-to-digital conversion module converts the signal processed by the receiving circuit into a digital signal; the main control module connects the analog-to-digital conversion module through the data line, and the digital signal generated by the analog-to-digital conversion module Feature extraction is performed to obtain the presence and absence of solid waste in the sewage and the size information, and the output result.

The transmitting transducer and the receiving transducer are selected from a waterproof T/R40-16 transducer with a center frequency of 40 kHz, a directivity angle of 60 degrees, and a waterproof package.

The receiving circuit is composed of a preamplifier circuit composed of a front chip NJM2100, a gain control circuit composed of an AD603 chip, a 40 kHz band pass filter circuit composed of a MAX274 chip, an envelope detection circuit composed of a NE5532 chip, and an interface circuit of the S3C2440 microprocessor. composition.

The main control module includes an ARM9S3C2440 microprocessor, and the transmitting circuit is controlled by the main control module ARM9S3C2440 microprocessor to control the 4046 oscillating circuit to output a 40 kHz continuous signal.

After adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. The sonar online monitoring of the fixed garbage in the sewage pipe can be effectively realized; 2. The simple and convenient acoustic signal continuous wave non-uniformity detection utilizes the wide pointing Sexual and symmetrical characteristics enable the existence of solid waste and the extraction of dimensional information in narrow, closed, water level changing pipes, avoiding the defects of traditional visible light, electromagnetic wave and ultrasonic detection methods in this environment; The system is easy to install, use and maintain, and has low cost. It is easy to combine with sewage crushing grid to form an automatic monitoring and pulverizing treatment system for solid waste in sewage.

DRAWINGS

Figure 1 is a schematic diagram of the system of the present invention;

2 is an acoustic signal transmitting circuit and a circuit diagram connected to the main control module;

3 is a circuit diagram showing a connection between an acoustic signal receiving circuit and a main control module;

Figure 4 is a schematic diagram showing the waveform of the continuous signal envelope of the solid waste passing through the detection system and the received acoustic signal in the sewage pipe. 4(a) is the received signal envelope diagram; FIG. 4(b) is the schematic diagram of the ultrasonic transmitting and receiving sensor arrangement and online monitoring of the passage of solid waste; and FIG. 4(c) is the 40kHz continuous sine wave used by the transmitting circuit. Signal waveform diagram.

Main symbol description

1, the transmitting circuit

2, the launch transducer

3, receiving transducer

4, acoustic signal receiving circuit

5, analog to digital conversion module

6, the main control module

7. Sewage pipe.

detailed description

The invention will be further described below in conjunction with the drawings and specific embodiments.

Embodiment: An on-line monitoring sonar device for solid waste in a sewage pipe, as shown in FIG. 1, comprising a transmitting circuit 1, a transmitting transducer 2, a receiving transducer 3, an acoustic signal receiving circuit 4, and an analog to digital conversion Module 5 and main control module 6. The transmitting circuit 1 generates a transmitting signal and is connected to the transmitting transducer 2. The transmitting transducer 2 is mounted at the bottom of the sewer pipe 7 to emit an acoustic signal. The receiving transducer 3 is mounted on the top of the sewer pipe 7 and receives an acoustic signal emitted by the transmitting transducer 2. The receiving circuit 4 is connected to the receiving transducer 3, and the acoustic signal received by the receiving transducer 3 is transmitted to the analog-to-digital conversion module 5 via preamplification, gain control, band pass filtering and envelope detection processing, and analog to digital conversion The module 5 converts the signal processed by the receiving circuit 4 into a digital signal. The main control module 6 is connected to the analog-to-digital conversion module 5 through the data line, and performs feature extraction on the digital signal generated by the analog-to-digital conversion module 5 to obtain the presence or absence and size information of the solid waste in the sewage, and output the result. The transmitting transducer 2 and the receiving transducer 3 are selected from a waterproof T/R40-16 transducer having a center frequency of 40 kHz and a directivity angle of 60 degrees, and a waterproof package. The receiving circuit 4 is composed of a preamplifier circuit composed of a front chip NJM2100, a gain control circuit composed of an AD603 chip, a 40 kHz band pass filter circuit composed of a MAX274 chip, an envelope detection circuit composed of a NE5532 chip, and an interface circuit of an S3C2440 microprocessor. (As shown in Figure 3). The main control module 6 includes an ARM9S3C2440 microprocessor, and the transmitting circuit is controlled by the main control module ARM9S3C2440 microprocessor to control the 4046 oscillating circuit to output a 40 kHz continuous signal.

The transmitting transducer 2 installed at the bottom of the sewer pipe 7 emits a continuous sinusoidal acoustic signal having a center frequency of 40 k Hz to realize the dimensional information monitoring of the solid waste by utilizing the non-uniform characteristics of the continuous wave signal. The receiving acoustic signal sensor 3 mounted on the top of the pipe receives the acoustic signal. The 4046 oscillator circuit is controlled by the main control module ARM9S3C2440 microprocessor to output a 40 kHz continuous signal. After the main control module 6 starts the acoustic signal transmission, the voltage-controlled oscillation circuit composed of the 4046 chip shown in FIG. 2 is outputted by the GPB10 port of the S3C2440 to enable the 4046 chip to output a continuous oscillation signal with a center frequency of 40k Hz to promote the transmission transduction. The TS transmits a 40 kHz continuous signal. The acoustic signal received by the acoustic signal receiving circuit 4 is amplified by the preamplifier circuit, gain control, band pass filtering, and envelope detection, and then input into the 8-channel analog-to-digital conversion chip MAX118, and the S3C2440 microprocessor is controlled by the IO port GPB2, 3, 4 The input channel terminals A6 and A7 of the MAX118 control the read/write ports WR and RD of the MAX118 through the timer output pins TOUT0 and TOUT1 to perform analog-to-digital conversion of the sampling frequency of 20ksps, and the received signal envelopes are performed through the data lines DATA0 to DATA7. The 8-bit analog-to-digital conversion result is transmitted to the main control module S3C2440 microprocessor. The non-uniformity detection process of the received acoustic signal is processed by digital signal, and is processed by the ARM9S3C2440 microprocessor as the main control module. The analog-to-digital converted acoustic reception signal envelope is characterized by non-uniformity in the S3C2440 microprocessor. Parameter extraction, judgment, alarm output.

The process of detecting the non-uniformity characteristic of the received continuous sine wave signal envelope to obtain the solid waste information in the sewage is described in detail below with reference to FIG. 4: the transmitting transducer 2 is installed at the bottom of the sewage pipe 7 to emit a 40 kHz continuous sine wave. The signal (as shown in Fig. 4(c)), the receiving transducer 3 is installed at the bottom of the sewage pipe 7 to receive and extract the signal. Since the transmitting and receiving transducers have a wide transmitting and receiving directivity beam (the waterproof type T/R40 transmitting and receiving transducers used in this embodiment has a directional beam angle of 60 degrees, as shown in FIG. 4(b). The dotted line is shown symmetrically and distributed symmetrically around the sensor centerline. The amplitude of the signal envelope received by the receiving transducer 3 actually reflects the acoustic signal transmission characteristics in the directional beamwidth region, when the pipe is flowing through the sewage. When the solid waste is contained, the solid waste is transmitted through the transmitting transducer 2, and receives the central axis of the transducer 3 (as indicated by a chain line in FIG. 4(b)), and the transmitting transducer 2 emits and is received and transduced. The signal directional beam received by the device 3 undergoes a series of time symmetry effects such as unoccluded, partially occluded, totally occluded, partially occluded, and unoccluded, which are reflected on the extracted received signal envelope. A non-uniform feature resembling an inverted trapezoid as shown in Fig. 4(a). Then, after the envelope is converted into the main control module by analog-to-digital conversion, the digital signal processing algorithm is only needed to perform parameter detection on the concaveness k and the concave width w of the inverted trapezoidal non-uniformity portion in the received signal envelope of the receiving transducer 3. Information on the availability and size of solid waste in wastewater can be obtained. The depression degree k and the depression width w are respectively defined as (as shown in FIG. 4( a )): w = the signal amplitude is lower than the end time t of the set threshold v 2 - the signal amplitude is lower than the starting time t1 of the set threshold v; k = the minimum signal amplitude between time t1 and t2; the threshold value v is set according to the situation of on-site sewage, pumping station crushing equipment, etc.

The digital signal processing detection algorithms of the above parameters can all adopt algorithms commonly used in the art. After detecting and extracting the non-uniformity characteristics of the envelope of the received signal, the degree of sag k reflects the phenomenon of sound propagation caused by solid non-uniformity such as solid waste in the sewage, and the width w of the recess reflects the size information of the solid waste. The larger the solid waste, the larger the corresponding w parameter. Since the embodiment adopts continuous wave emission, continuous wave detection and feature extraction, the envelope non-uniformity feature is used to detect the size of the solid waste in the sewage with high precision, and real-time and on-line monitoring can be realized. The amplitude variation of the received signal caused by the change of the sewage level between the transmitting transducer 2 and the receiving transducer 3 is automatically controlled by the gain control chip AD603 in the receiving circuit according to the voltage output by the main control module. The specific implementation process is as follows: The main control processor receives and determines the current average signal amplitude, and controls the gain of the AD603 chip by outputting an appropriate control voltage from the digital analog output (DAC) port AINT2 pin of the main control module of the embodiment according to the current signal average amplitude (see FIG. 3). As shown, the amplitude of the received signal can be adjusted to an appropriate range, without being affected by changes in the level of the sewage in the pipe (in the case of full overflow, the system can also be used when the transmitting and receiving transducers are immersed in the sewage). normal work).

After the main control module S3C2440 performs the non-uniformity parameter of the envelope waveform, the sagging degree k and the recess width w are detected, the alarm threshold can be set. Once the non-uniformity parameter exceeds the alarm threshold, the alarm signal can be output, and the sewage pump station is activated. The pulverizing equipment processes the solid waste in time to avoid the serious consequences of clogging. Due to continuous wave transmission and connection Receiving and processing can realize online and real-time processing of solid waste in sewage.

The main steps of on-line monitoring of sonar in solid waste in sewage pipes can be summarized as: acoustic signal transmission, reception, signal envelope extraction, non-uniform feature extraction, and judgment output steps. The specific idea is to use a transmitting transducer 2 installed at the bottom of the sewage pipe 7 to emit a continuous sine wave, and the receiving transducer 3 installed at the top of the sewage pipe can obtain an acoustic signal transmitted from the bottom to the top, in the signal receiving circuit. The gain control is used to maintain the amplitude is basically the same. After the signal is amplified, filtered, and enveloped, the amplitude variation and the symmetry variation characteristic parameters of the signal envelope are extracted in the main control module, according to the extracted non-uniformity characteristic parameters. The judgment of solid waste information in sewage is carried out to realize on-line monitoring.

The acoustic signal transmitting and receiving steps respectively use the transmitting transducer 2 fixed at the bottom and the top position of the sewage pipe 7, and the receiving transducer 3 emits an acoustic signal and receives it; the signal envelope extraction step receives the acoustic signal and performs preamplification, Gain control, band-pass filtering, and envelope extraction; the non-uniform feature extraction step extracts the characteristics of the solid waste passing through the sewage in the envelope after analog-to-digital conversion of the signal envelope, and obtains the presence and size of the solid waste. The size information; the judgment output step is judged according to the extracted non-uniform feature, and the judgment result is output for subsequent processing. Aiming at the complicated situation of sewage impurities, narrow space and liquid level change in sewage pipe 7, the conventional methods and devices using pulse signal detection are difficult to detect the existence and size of solid waste. The size of the solid waste is detected by the azimuth symmetry of the wide directional beam of the universal transmitting and receiving transducers, and the simple and convenient continuous wave non-uniform feature detecting means is used to obtain the presence and size information of the solid waste in the sewage. Therefore, the use of complex, high-cost array technology to form a sharp detection beam is avoided; at the same time, the gain control in the receiving circuit 4 avoids the variation of the received signal amplitude caused by the change of the sewage level between the transmitting and receiving transducers. Impact.

The largest feature of the on-line monitoring sonar device for solid waste in the sewage pipe disclosed in the present invention is that the continuous wave non-uniformity detection of the acoustic signal is used to realize the narrow, closed and water level change in the sewage pipe channel by means of a simple and convenient acoustic beam non-uniformity detection. The existence of solid waste and the extraction of dimensional information avoid various defects of the conventional visible light, electromagnetic wave, ultrasonic and other detection methods in the use environment. At the same time, the system is easy to install, use and maintain, and has low cost. It is easy to combine with sewage crushing grid to form an automatic monitoring and pulverizing treatment system for solid waste in sewage.

The above is only the preferred embodiment of the present invention, and is not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still The technical solutions described are modified, or some of the technical features are equivalently replaced. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

An on-line monitoring sonar device for solid waste in a sewage pipe channel, comprising: a transmitting circuit, a transmitting transducer, a receiving transducer, an acoustic signal receiving circuit, an analog-to-digital conversion module and a main control module; The circuit generates a transmit signal and is coupled to the transmit transducer; the transmit transducer is mounted at the bottom of the sewer pipe to emit an acoustic signal; the receive transducer is mounted at the top of the sewer pipe to receive a signal from the transmit transducer; The receiving circuit is connected to the receiving transducer, and the acoustic signal received by the receiving transducer is transmitted to the analog-to-digital conversion module through preamplification, gain control, band pass filtering and envelope detection processing, and the analog to digital conversion module receives the received signal. The signal processed by the circuit is converted into a digital signal; the main control module is connected to the analog-to-digital conversion module through the data line, and the digital signal generated by the analog-to-digital conversion module is extracted to obtain the presence or absence and size information of the solid waste in the sewage, and the output result is obtained. .
The on-line monitoring sonar device for solid waste in a sewage pipe according to claim 1, wherein the transmitting transducer and the receiving transducer are selected from a waterproof T/R40-16 transducer, and a center frequency thereof. It is 40kHz, with a directional angle of 60 degrees and is waterproof.
The on-line monitoring sonar device for solid waste in a sewage pipe according to claim 1, wherein the receiving circuit comprises a preamplifier circuit composed of a front chip NJM2100, a gain control circuit composed of an AD603 chip, and a MAX274 chip. The 40kHz band pass filter circuit, the envelope detection circuit composed of NE5532 chip and the interface circuit of S3C2440 microprocessor are composed.
The on-line monitoring sonar device for solid waste in a sewage pipe according to claim 1, wherein the main control module comprises an ARM9 S3C2440 microprocessor, and the transmitting circuit is controlled by the main control module ARM9 S3C2440 microprocessor to 4046 oscillation. The circuit outputs a 40 kHz continuous signal.