CN113595571B - Circuit signal processing method, pipeline blockage detection signal receiver and pipeline blockage detector - Google Patents
Circuit signal processing method, pipeline blockage detection signal receiver and pipeline blockage detector Download PDFInfo
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- CN113595571B CN113595571B CN202110860655.6A CN202110860655A CN113595571B CN 113595571 B CN113595571 B CN 113595571B CN 202110860655 A CN202110860655 A CN 202110860655A CN 113595571 B CN113595571 B CN 113595571B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Abstract
The invention discloses a circuit signal processing method, a pipeline blockage detection signal receiver and a pipeline blockage detector, wherein the method comprises the following steps: setting a plurality of circuit signal thresholds; increasing or decreasing the circuit signal by a value according to a set circuit signal threshold to obtain a processed circuit signal, and taking the processed circuit signal as a target circuit signal; the signal receiver comprises a signal receiving module, a signal conversion module, a signal processing module, a first response module and a second response module, wherein the signal processing module processes circuit signals according to the method. The invention can help operators to quickly and accurately find the blockage point of the pipeline.
Description
Technical Field
The invention relates to the technical field of pipeline construction supplies, in particular to a circuit signal processing method, a pipeline blockage detection signal receiver and a pipeline blockage detector.
Background
In the household life or the building engineering, the condition that a pre-laid PVC pipeline, an iron pipe or a cement pipeline is blocked by sand ash, waste garbage discharge, stones and the like and cannot be normally used or is blocked along the line often occurs, in the dredging process, the blocked position cannot be accurately found, so that the manpower, material resources, financial resources and time are wasted, once the pipeline is not properly dismantled, certain loss is caused, and even the whole section of the pipeline is abandoned, which is a very troubling and troublesome thing.
In order to solve the problems, an instrument for detecting the blockage of the threading pipe is developed on the market at present. For example, the Chinese patent with the patent number '2014203656709' discloses a pipeline blockage detecting device, which comprises a signal generator and a signal receiver, wherein the signal generator is connected with a signal generator joint through a signal transmission line, and the signal generator joint is connected with a signal generator joint seat on a transmission line receiving and releasing box; the transmission line receiving and releasing box comprises a rotary shell and a transmission line fixing plate, wherein a signal transmission line is wound on the transmission line fixing plate, and two ends of the signal transmission line are respectively connected with the signal generator connector base and the signal transmitting head; the signal receiver comprises a signal receiving inductor, a signal amplification circuit board and a power supply, wherein the signal receiving inductor is connected with the signal amplification circuit board, the signal amplification circuit board is connected with the power supply, and the signal amplification circuit board is connected with a signal output device.
The pipeline blockage measuring device is single in function, and mainly comprises a generator, a signal line, a signal transmitting head and a signal receiver, wherein the generator sends out electromagnetic signals, the electromagnetic signals are transmitted to the signal line and then transmitted to the signal transmitting head, and then the signal receiver receives the electromagnetic signals to find a fault point. At present, the pipeline blockage detection signal receiver judges the strength of a signal mainly through the sound of a loudspeaker arranged on the signal receiver or the number of the signal lamps with limited number, so that the distance between the signal receiver and a fault point is judged, and the fault point is searched. Because the sensitivity of human ears to the sound intensity is not high, and only 5 indicator lamps are provided, the change is not large, even no change exists, so that the position of the blockage point judged by an operator is fuzzy, and the position of the blockage point can not be accurately judged by the operator. The receiving range of the signal receiver needs to be adjusted manually when the detection work (the work of searching for the blockage point) is carried out each time, the operation is complex, and the corresponding receiving signal range cannot be adjusted accurately.
Disclosure of Invention
The present invention provides a circuit signal processing method, a pipeline blockage detection signal receiver and a pipeline blockage detector, so as to overcome the above-mentioned defects in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a method of circuit signal processing, the method comprising the steps of:
1) setting a plurality of circuit signal thresholds;
2) and increasing or decreasing the circuit signal by a value according to the set circuit signal threshold to obtain a processed circuit signal, and taking the processed circuit signal as a target circuit signal.
As a preference, the method comprises the steps of:
1) setting a plurality of circuit signal thresholds, wherein a plurality of circuit signal range values with the same interval size are formed among the circuit signal thresholds;
2) comparing the circuit signal with a plurality of circuit signal range values, if the circuit signal is in the circuit signal range value set in the step 1), obtaining a target circuit signal range value in which the circuit signal falls, and executing the step 3);
3) and subtracting an adjustment value from the circuit signal to obtain a processed circuit signal, and taking the processed circuit signal as a target circuit signal, wherein the adjustment value is a difference value between a circuit signal threshold value at the small end of a target circuit signal range value and a minimum circuit signal threshold value.
Preferably, in step 2), the circuit signal is increased or decreased by using the circuit signal threshold value and zero set in step 1) as an adjustment value to obtain a processed circuit signal, and the processed circuit signal is used as a target circuit signal.
Preferably, the circuit signal having the minimum circuit signal threshold value is set as the target circuit signal when the processed circuit signal is smaller than the set minimum circuit signal threshold value, the processed circuit signal is set as the target circuit signal when the processed circuit signal is greater than or equal to the set minimum circuit signal threshold value and smaller than the set maximum circuit signal threshold value, and the circuit signal having the maximum circuit signal threshold value is set as the target circuit signal when the processed circuit signal is greater than or equal to the set maximum circuit signal threshold value.
A pipe blockage detection signal receiver, the receiver comprising:
the signal receiving module is used for receiving an electromagnetic signal sent by the pipeline blockage detection signal transmitter and transmitting the electromagnetic signal to the signal conversion module;
the signal conversion module is used for converting the electromagnetic signal into a circuit signal and transmitting the circuit signal to the second signal processing module;
A second signal processing module, configured to process the circuit signal according to the circuit signal processing method of claim 2 or 3, to obtain a second target circuit signal, and transmit the second target circuit signal to a second response module;
and the second response module is used for executing corresponding actions according to the received second target circuit signal.
As a preference, further comprising:
the first response module is used for receiving the circuit signal transmitted by the signal conversion module and executing corresponding action according to the received circuit signal.
Preferably, the first response module includes one or more of a first scroll bar display module, a first digital display module and a first buzzer, the first scroll bar display module is configured to display a scroll bar corresponding to the strength of the circuit signal, the first buzzer is configured to emit a sound corresponding to the strength of the circuit signal when the strength of the circuit signal is stronger, the first digital display module is configured to display a value corresponding to the strength of the circuit signal when the strength of the circuit signal is stronger, and the first digital display module displays the value when the strength of the circuit signal is stronger; the second response module comprises one or two of a second scroll bar display module and a second digital display module, the second scroll bar display module is used for displaying scroll bars corresponding to the signal intensity of a second target circuit, when the signal intensity of the second target circuit is stronger, the scroll bars are longer, the second digital display module is used for displaying numerical values corresponding to the signal intensity of the second target circuit, and when the signal intensity of the second target circuit is stronger, the numerical values displayed by the second digital display module are larger.
A pipeline blockage detector comprises the signal receiver and a pipeline blockage detecting signal transmitter matched with the signal receiver.
An electronic device, comprising: the circuit signal processing method comprises a memory and a processor, wherein the memory and the processor are connected with each other in a communication mode, computer instructions are stored in the memory, and the processor executes the computer instructions so as to process the circuit signal by executing the circuit signal processing method.
A computer-readable storage medium storing computer instructions for causing the computer to process the circuit signal by performing the circuit signal processing method as described above.
The invention has the beneficial effects that: the invention can help operators to quickly and accurately find the blockage point of the pipeline.
Drawings
FIG. 1 is a flow chart of a signal processing method of the circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of a circuit signal processing method according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of functional modules of the signal receiver according to an embodiment of the present invention;
fig. 4 is a circuit diagram of the signal receiving module according to one embodiment of the present invention;
FIG. 5 is a circuit diagram of an electromagnetic signal amplifying circuit according to a first embodiment of the present invention;
FIG. 6 is a circuit diagram of a signal amplifying and converting module according to a first embodiment of the present invention;
FIG. 7 is a circuit diagram of a digital circuit according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of a signal amplification output circuit according to a first embodiment of the present invention;
fig. 9 is a circuit diagram of a signal processing module according to a first embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "connected" should be construed broadly and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art. For example, in the present invention, the signal receiving module may be disposed in a housing together with other functional modules, or may be electrically connected to other functional modules through a longer signal transmission line. Adopt a longer signal transmission line when even with other functional module electricity, to when looking for the pipeline jam point of eminence, user of service just need not ascend a height and go to look for the jam point, can bind the receiver with the help of the bracing piece and look for the jam point. Although the above-mentioned modifications can achieve better application results in practical applications, those skilled in the art can appreciate that the modifications are also within the technical scope of the present invention.
Example one
As shown in fig. 1, a circuit signal processing method according to a first embodiment of the present invention includes the following steps:
step 1: setting a plurality of circuit signal thresholds, wherein a plurality of circuit signal range values with the same interval size are formed among the circuit signal thresholds. Specifically, for example, circuit signal thresholds of 10mV, 20mV, 30mV, and 40mV are set, and these circuit signal thresholds constitute circuit signal range values of 10mV to 20mV, 20mV to 30mV, and 30mV to 40mV, respectively.
Step 2: comparing the size value of the circuit signal with a plurality of circuit signal range values, if the circuit signal is within the circuit signal range value set in the step 1, obtaining a target circuit signal range value in which the circuit signal falls, and executing the step 3, if the circuit signal is smaller than a set minimum circuit signal threshold value, taking the minimum circuit signal threshold value as the target circuit signal. Specifically, for example, if the value of the collected circuit signal is 24mV, and the value is within the circuit signal range set in step 1, step 3 is executed; if the value of the collected circuit signal is 5mV or 45mV, the circuit signal with the value of 10mV or 40mV is used as the target circuit signal.
And step 3: and subtracting an adjustment value from the size value of the circuit signal to obtain a target circuit signal, wherein the adjustment value is the difference between the circuit signal threshold value at the small end of the range value of the target circuit signal and the minimum circuit signal threshold value. Specifically, for example, if the value of the collected circuit signal is 24mV, which is within the circuit signal range value set in step 1, the target circuit signal is 24mV- (20 mV-10 mV) =14mV, that is, the circuit signal with the value of 14mV is used as the target circuit signal.
Example two
As shown in fig. 2, a circuit signal processing method according to the second embodiment of the present invention includes the following steps:
step 1: a number of circuit signal thresholds are set. For example, circuit signal thresholds of 10mV, 20mV, 30mV and 40mV are set.
Step 2: and (2) increasing or decreasing the circuit signal by taking the circuit signal threshold value set in the step (1) and zero as adjustment values to obtain a processed circuit signal, if the processed circuit signal is smaller than the set minimum circuit signal threshold value, taking the circuit signal with the minimum circuit signal threshold value as a target circuit signal, and if the processed circuit signal is larger than or equal to the set minimum circuit signal threshold value, taking the processed circuit signal as the target circuit signal. Specifically, for example, the value of the acquired circuit signal is 24mV, 0mV, 10mV, 20mV, 30mV, and 40mV are set as a plurality of adjustment steps, when the signal adjustment step of the receiver is set to 10mV, 14mV is obtained by subtracting 10mV from the acquired circuit signal 24mV, and the circuit signal with the size of 14mV is used as the target circuit signal if 14mV is greater than 10 mV; when the signal adjustment gear of the receiver is set to 20mV, the acquired circuit signal 24mV is subtracted by 20mV to obtain 4mV as the processed circuit signal, and 4mV is less than 10mV, so that the set minimum circuit signal threshold value of 10mV is used as the target circuit signal.
As shown in fig. 3, the present invention also discloses a pipe blockage detecting signal receiver, which comprises:
the signal receiving module is used for receiving an electromagnetic signal sent by the pipeline blockage detection signal transmitter and transmitting the electromagnetic signal to the signal conversion module;
the signal conversion module is used for converting the electromagnetic signal into a circuit signal and transmitting the circuit signal to the second signal processing module and the first response module;
a second signal processing module, configured to process the circuit signal according to the circuit signal processing method in the first embodiment to obtain a second target circuit signal, and transmit the second target circuit signal to a second response module;
the first response module is used for executing corresponding actions according to the received circuit signals;
and the second response module is used for executing corresponding actions according to the received second target circuit signal.
In this embodiment, the first response module includes one or more of a first scroll bar display module, a first digital display module, and a first buzzer, where the first scroll bar display module is configured to display a scroll bar corresponding to a circuit signal strength, the longer the scroll bar is when the circuit signal strength is stronger, the longer the scroll bar is, the first buzzer is configured to generate a sound corresponding to the circuit signal strength, the stronger the circuit signal strength is, the greater the intensity of the sound is, the first digital display module is configured to display a value corresponding to the circuit signal strength, and the stronger the circuit signal strength is, the greater the value displayed by the first digital display module is; the second response module comprises one or two of a second scroll bar display module and a second digital display module, the second scroll bar display module is used for displaying scroll bars corresponding to the signal intensity of a second target circuit, when the signal intensity of the second target circuit is stronger, the scroll bars are longer, the second digital display module is used for displaying numerical values corresponding to the signal intensity of the second target circuit, and when the signal intensity of the second target circuit is stronger, the numerical values displayed by the second digital display module are larger.
During specific design, a designer designs a suitable circuit signal range value according to a specific second response module, wherein the circuit signal range value formed by two minimum circuit signal thresholds ensures that the second response module has the maximum sensing sensitivity, so that when a second target circuit signal changes within the circuit signal range value, the second response module can give out the maximum changed signal response, thereby facilitating judgment of a user on one hand and improving the precision of the receiver on the other hand.
In a preferred embodiment, the first response module adopts a combination of a first buzzer and a first scroll bar display module, and the second response module adopts a second scroll bar display module. The user uses the pipeline blockage detection signal receiver to search a pipeline blockage point, when the receiver is far away from the blockage point, the signal is weak, the circuit signal received by the receiver is smaller than the set minimum circuit signal threshold, and the minimum circuit signal threshold is used as a second target circuit signal. The design can verify whether the second response module works normally on one hand, and can also make a psychological positive contribution to users on the other hand. When a user operates the receiver to gradually approach the blockage point, the circuit signal received by the receiver is continuously enhanced, the sound emitted by the first buzzer is gradually increased, the longer the scroll bar of the first scroll bar display module is, the more intuitive feeling that the signal is gradually enhanced is brought to people, the second scroll bar display module is under the action of the second signal processing module, the scroll bar is gradually lengthened, then is shortest, and then is gradually lengthened, when the sound of the first buzzer is very large, and the scroll bar of the first scroll bar is already long, the second scroll bar display module is observed, when the receiver approaches the pipeline blockage point, the position of the receiver is slightly adjusted, the length of the second scroll bar is seen to fluctuate, and the position of the receiver corresponding to the fluctuating balance point is found, namely the position of the pipeline blockage point.
Further, in this embodiment, the receiver further includes a first signal processing module, configured to process the circuit signal and transmit a first target circuit signal obtained by the processing to the first responding module, where the processing of the circuit signal by the first signal processing module includes: and if the circuit signal is greater than the maximum first target circuit signal threshold value, the maximum first target circuit signal threshold value is taken as a first target circuit signal and is transmitted to the first response module. The purpose of the above arrangement is: for example, when the receiver is far away from the pipe blockage point, the signal received by the receiver is very weak, and a minimum first target circuit signal threshold value is set to be convenient for checking whether the first response module of the receiver works normally or not based on the purpose of the second signal processing module. When the receiver is closer to the pipeline blockage point, the received circuit signal is stronger. On one hand, the excessive sound gives people a feeling of noise, which can cause discomfort of the human body, on the other hand, when the intensity of the sound exceeds a certain limit, the sensitivity of the human ear to the sound is weakened, and in addition, the first response module and the second response module are arranged to form a comparison, so that the superiority of the product of the invention relative to a common receiver can be more intuitively and obviously highlighted.
As shown IN fig. 4-9, the present invention further discloses a specific circuit implementation manner of the pipeline blockage detecting signal receiver according to the first embodiment, wherein the signal receiving module IN fig. 4 senses an electromagnetic signal sent by a signal transmitter of the pipeline blockage detecting device, and transmits the electromagnetic signal to the IUD-IN terminal IN the electromagnetic signal amplifying circuit IN fig. 5 through the pin 3, the amplified electromagnetic signal is connected to the pin 6 of the digital potentiometer IN fig. 7 through the IUD-OUT terminal IN the electromagnetic signal amplifying circuit, the pin 5 of the digital potentiometer is connected to the AUDIO IN terminal IN the signal amplifying and outputting circuit IN fig. 8 and the AUDIO IN terminal IN the signal amplifying and converting circuit IN fig. 6, the SIG-ADC terminal IN the signal amplifying and converting circuit IN fig. 6 is connected to the pin 11 of the signal processing module IN fig. 9, that is, the electromagnetic signal converted into the digital signal is compared with a circuit signal set IN the signal processing module, the No. 3 and No. 4 pins of the digital potentiometer are respectively connected with the No. 21 and No. 22 pins of the signal processing module in fig. 9, and are used for controlling the size of the signal output to the signal amplification output circuit according to the result of the comparison operation.
The invention also discloses a pipeline blockage detector, which comprises the signal receiver and a pipeline blockage detection signal transmitter matched with the signal receiver.
The invention also discloses an electronic device, comprising: the circuit signal processing method comprises a memory and a processor, wherein the memory and the processor are mutually connected in a communication mode, computer instructions are stored in the memory, and the processor executes the computer instructions so as to process the circuit signals by executing the circuit signal processing method.
The invention also discloses a computer readable storage medium, which stores computer instructions for causing the computer to execute the circuit signal processing method to process the circuit signal.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A pipe blockage detection signal receiver, said receiver comprising:
the signal receiving module is used for receiving an electromagnetic signal sent by the pipeline blockage detection signal transmitter and transmitting the electromagnetic signal to the signal conversion module;
the signal conversion module is used for converting the electromagnetic signal into a circuit signal and transmitting the circuit signal to the second signal processing module;
a second signal processing module, configured to process the circuit signal according to the first circuit signal processing method or the second circuit signal processing method as follows to obtain a second target circuit signal, and transmit the second target circuit signal to a second response module, where:
the first circuit signal processing method includes the steps of:
1) setting a plurality of circuit signal thresholds, wherein a plurality of circuit signal range values with the same interval size are formed among the circuit signal thresholds;
2) comparing the circuit signal with a plurality of circuit signal range values, if the circuit signal is within the circuit signal range value set in the step 1), obtaining a target circuit signal range value in which the circuit signal falls, and executing the step 3);
3) Subtracting an adjustment value from the circuit signal to obtain a processed circuit signal, and using the processed circuit signal as a target circuit signal, wherein the adjustment value is a difference value between a circuit signal threshold value at a small end of a target circuit signal range value and a minimum circuit signal threshold value,
the second circuit signal processing method includes the steps of:
1) setting a plurality of circuit signal thresholds;
2) taking the circuit signal threshold value and zero set in the step 1) as adjustment values to increase or decrease the circuit signal to obtain a processed circuit signal, and taking the processed circuit signal as a target circuit signal;
and the second response module is used for executing corresponding actions according to the received second target circuit signal.
2. The signal receiver of claim 1, further comprising:
the first response module is used for receiving the circuit signal transmitted by the signal conversion module and executing corresponding action according to the received circuit signal.
3. The signal receiver of claim 2, wherein the first response module comprises one or more of a first scroll bar display module, a first digital display module, and a first buzzer, the first scroll bar display module is configured to display a scroll bar corresponding to the circuit signal strength, the longer the scroll bar is when the circuit signal strength is stronger, the longer the scroll bar is, the first buzzer is configured to emit a sound corresponding to the circuit signal strength, the stronger the circuit signal strength is, the stronger the sound is, the first digital display module is configured to display a value corresponding to the circuit signal strength, and the stronger the circuit signal strength is, the larger the value is displayed by the first digital display module; the second response module comprises one or two of a second scroll bar display module and a second digital display module, the second scroll bar display module is used for displaying scroll bars corresponding to the signal strength of a second target circuit, when the signal strength of the second target circuit is stronger, the scroll bars are longer, the second digital display module is used for displaying numerical values corresponding to the signal strength of the second target circuit, and when the signal strength of the second target circuit is stronger, the numerical values displayed by the second digital display module are larger.
4. A pipe blockage detector, comprising a signal receiver as claimed in any one of claims 1 to 3, and further comprising a pipe blockage detection signal transmitter for use with the signal receiver.
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| JP3543556B2 (en) * | 1997-08-28 | 2004-07-14 | 松下電器産業株式会社 | Digital sync separator |
| JP2003318818A (en) * | 2002-04-23 | 2003-11-07 | Nec Corp | Cellular telephone system and transmission power control method therefor |
| CN101076053B (en) * | 2007-06-21 | 2010-10-06 | 吴壬华 | Method and circuit for multi-channel photoelectric isolated voltage |
| CN204042453U (en) * | 2014-07-02 | 2014-12-24 | 安徽创奇监测设备有限公司 | Block apparatus surveyed by a kind of pipeline |
| CN107105562B (en) * | 2017-06-28 | 2019-11-05 | 上海传英信息技术有限公司 | System and method based on cell voltage control flash lamp output electric current |
| CN110057462A (en) * | 2019-05-29 | 2019-07-26 | 苏州英威腾电力电子有限公司 | A kind of temperature sensing circuit |
| CN212622997U (en) * | 2020-06-06 | 2021-02-26 | 廊坊市东润电子科技有限公司 | Pipeline blockage measuring signal transmitter and pipeline blockage measuring device |
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