CN212807171U - Flow detection system of grouting machine - Google Patents
Flow detection system of grouting machine Download PDFInfo
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- CN212807171U CN212807171U CN202022150868.3U CN202022150868U CN212807171U CN 212807171 U CN212807171 U CN 212807171U CN 202022150868 U CN202022150868 U CN 202022150868U CN 212807171 U CN212807171 U CN 212807171U
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Abstract
The utility model provides a slip casting machine flow detection system, through setting up first low pass filter and second low pass filter, can filter the high frequency signal in the flow signal on electrode A and electrode B respectively, extract the flow signal from the environmental noise, reduced environmental noise and electromagnetic flowmeter self noise, improved the SNR; by arranging the first bootstrap follower and the second bootstrap follower, flow signals on the electrode A and the electrode B can be effectively obtained, equipotential shielding is realized, and external electromagnetic interference and electrostatic interference are effectively shielded; by arranging the instrument amplifier, common-mode noise can be effectively inhibited; and a band-pass filter is arranged to carry out filtering amplification and rectification adjustment processing on the flow signal amplified by the instrument amplifier, so that the signal-to-noise ratio of the flow signal is effectively improved.
Description
Technical Field
The utility model relates to an intelligence slip casting machine technical field especially relates to a slip casting machine flow detection system.
Background
At present, many domestic engineering projects are applied to grouting technology, such as: the method comprises the steps of construction of a goaf grouting station, grouting for roadway reinforcement, grouting reinforcement of urban underground rail transit, grouting for preventing spontaneous combustion of coal gangue, grouting of a submarine tunnel and the like. When the grouting machine works, some key parameters need to be acquired, such as actual grouting pressure, actual grouting amount, oil temperature of a hydraulic system, pressure of the hydraulic system and the like. The working process of the whole grouting system is monitored by collecting relevant information, and relevant parameters which possibly prevent the normal work of the system are processed. Among them, a capacitive electromagnetic flowmeter is often used to monitor the actual grouting amount. Because the signal detection of the capacitance type electromagnetic flowmeter is realized in an electrode capacitance coupling mode, characteristic signals are weak and difficult to detect, various noises exist in the construction operation environment of the grouting machine in practical application, the construction of the grouting machine can introduce the noises, the flow signals are difficult to detect due to the existence of the noises, and the flow measurement results are influenced to a certain degree. Therefore, in order to solve the above problem, the utility model provides a slip casting machine flow detection system can reduce noise interference, improves flow signal's SNR, realizes flow signal's high accuracy and acquires the purpose.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a slip casting machine flow detection system can reduce noise interference, improves flow signal's SNR, realizes flow signal's high accuracy and acquires the purpose.
The technical scheme of the utility model is realized like this: the utility model provides a flow detection system of a grouting machine, which comprises an electromagnetic flowmeter, a controller and a signal conditioning circuit, wherein the electromagnetic flowmeter comprises an electrode A and an electrode B, and the signal conditioning circuit comprises a first low-pass filter, a second low-pass filter, a first bootstrap follower, a second bootstrap follower and an instrument amplifier;
the input end of the first low-pass filter is electrically connected with the electrode A, and the output end of the first low-pass filter is electrically connected with the first input end of the instrument amplifier through the first bootstrap follower;
the input end of the second low-pass filter is electrically connected with the electrode B, and the output end of the second low-pass filter is electrically connected with the second input end of the instrument amplifier through a second bootstrap follower;
the output end of the instrument amplifier is electrically connected with the analog input end of the controller.
On the basis of the technical scheme, preferably, the electrode A and the electrode B are both electrically connected with the electromagnetic flowmeter through coaxial cable shielding wires.
Further preferably, the electrode a and the electrode B each include an electrode signal input terminal and an electrode shielding terminal;
the electrode signal input end of the electrode A is electrically connected with the input end of the first low-pass filter through a central copper wire of a coaxial cable shielding wire;
and the electrode signal input end of the electrode B is electrically connected with the input end of the second low-pass filter through a central copper wire of the coaxial cable shielding wire.
Further preferably, the first low-pass filter comprises a resistor R17, a resistor R18, a capacitor C8 and an operational amplifier AD 8656;
the electrode signal input end of the electrode A is electrically connected with the non-inverting input end of the operational amplifier AD8656 through the resistor R17, one end of the resistor R18 is electrically connected with the electrode input end of the electrode A, one end of the capacitor C8 is electrically connected with the non-inverting input end of the operational amplifier AD8656, the other end of the resistor R18 and the other end of the capacitor C8 are both grounded, the inverting input end of the operational amplifier AD8656 is electrically connected with the output end thereof, and the output end of the operational amplifier AD8656 is electrically connected with the first input end of the instrumentation amplifier through the first bootstrap follower.
Further preferably, the first bootstrap follower includes a bootstrap circuit and a voltage follower;
the output end of the first low-pass filter is electrically connected with the first input end of the instrumentation amplifier and the input end of the voltage follower through the bootstrap circuit respectively, and the output end of the voltage follower is electrically connected with the shielding end of the electrode A through the outer shielding layer of the coaxial cable.
Further preferably, the bootstrap circuit includes: a resistor R1, a resistor R2, a capacitor C1 and an operational amplifier OPA 2130;
the output end of the first low-pass filter is electrically connected with one end of a resistor R1 and a pin 3 of an operational amplifier OPA2130 respectively, the other end of a resistor R1 is electrically connected with one end of a resistor R2 and one end of a capacitor C1 respectively, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is electrically connected with a pin 2 and a pin 1 of the operational amplifier OPA2130 respectively, and the pin 1 of the operational amplifier OPA2130 is electrically connected with a first input end of an instrumentation amplifier and an input end of a voltage follower respectively.
On the basis of the above technical solution, preferably, the apparatus further comprises a band-pass filter;
the band pass filter is connected in series in the line between the output of the instrumentation amplifier and the analog input of the controller.
On the basis of the above technical solution, preferably, the first low-pass filter and the second low-pass filter have the same structure, the first bootstrap follower and the second bootstrap follower have the same structure, and the first low-pass filter, the second low-pass filter, the first bootstrap follower and the second bootstrap follower are symmetrically arranged.
The utility model discloses a slip casting machine flow detection system has following beneficial effect for prior art:
(1) the first low-pass filter and the second low-pass filter are arranged, so that high-frequency signals in the flow signals on the electrode A and the electrode B can be filtered respectively, the flow signals are extracted from environmental noise, the environmental noise and the noise of the electromagnetic flowmeter are reduced, and the signal-to-noise ratio is improved;
(2) by arranging the first bootstrap follower and the second bootstrap follower, flow signals on the electrode A and the electrode B can be effectively obtained, equipotential shielding is realized, and external electromagnetic interference and electrostatic interference are effectively shielded;
(3) by arranging the instrument amplifier, common-mode noise can be effectively inhibited;
(4) and a band-pass filter is arranged to carry out filtering amplification and rectification adjustment processing on the flow signal amplified by the instrument amplifier, so that the signal-to-noise ratio of the flow signal is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a flow detection system of a grouting machine of the present invention;
fig. 2 is a circuit diagram of a first low-pass filter and a first bootstrap follower in the flow detection system of the grouting machine of the present invention;
fig. 3 is a circuit diagram of an instrument amplifier in the flow detection system of the grouting machine of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a flow detection system of grouting machine, it includes electromagnetic flowmeter, signal conditioning circuit and controller.
An electromagnetic flowmeter, which adopts a capacitance type electromagnetic flowmeter and comprises two excitation coils, two electrodes and a steel pipe as shown in figure 1; the steel pipe and pipeline intercommunication, two excitation coils set up on the steel pipe lateral wall along steel pipe radial direction relatively, and two electrodes run through the steel pipe respectively, and excitation coil circular excitation forms the magnetic field in the steel pipe, through the electrode and by on the capacitive action between the fluid couples the induced electromotive force to the detection polar plate, the flow signal in the pipeline can be learnt to the signal of telecommunication of detection electrode, above-mentioned structure belongs to prior art, and this embodiment does not relate to the improvement to electromagnetic flowmeter mechanical structure. In this embodiment, the two electrodes are respectively marked as an electrode a and an electrode B, the electrode a and the electrode B are both electrically connected with the electromagnetic flowmeter through a coaxial cable shielding wire, and the electrode a and the electrode B both include an electrode signal input end and an electrode shielding end.
The signal conditioning circuit reduces environmental noise and self noise of the electromagnetic flowmeter, improves the acquisition rate of flow signals, accurately acquires electric signals on the electrode A and the electrode B, and conditions the electric signals. In this embodiment, the signal conditioning circuit includes a first low-pass filter, a second low-pass filter, a first bootstrap follower, a second bootstrap follower, an instrumentation amplifier, and a band-pass filter.
The first low-pass filter filters high-frequency noise on the electrode A, extracts flow signals from environmental noise, reduces the environmental noise and the noise of the electromagnetic flowmeter, and improves the signal-to-noise ratio. In this embodiment, an electrode signal input end of the electrode a is electrically connected to an input end of the first low-pass filter through a central copper wire of the coaxial cable shielding wire, and an output end of the first low-pass filter is electrically connected to a first input end of the instrumentation amplifier through the first bootstrap follower. Preferably, as shown in fig. 2, the first low-pass filter includes a resistor R17, a resistor R18, a capacitor C8, and an operational amplifier AD 8656; specifically, an electrode signal input end of the electrode a is electrically connected with a non-inverting input end of the operational amplifier AD8656 through the resistor R17, one end of the resistor R18 is electrically connected with the electrode input end of the electrode a, one end of the capacitor C8 is electrically connected with the non-inverting input end of the operational amplifier AD8656, the other end of the resistor R18 and the other end of the capacitor C8 are both grounded, an inverting input end of the operational amplifier AD8656 is electrically connected with an output end thereof, and an output end of the operational amplifier AD8656 is electrically connected with a first input end of the instrumentation amplifier through the first bootstrap follower. The resistor R17, the resistor R18 and the capacitor C8 form an RC filter for filtering high-frequency signals in flow signals; the operational amplifier AD8656 constitutes a voltage follower for increasing the input impedance. A _ input represents the flow signal of electrode A.
And the first bootstrap follower is used for accurately extracting the flow signal output by the first low-pass filter. In this embodiment, the first bootstrap follower includes a bootstrap circuit and a voltage follower.
The bootstrap circuit detects the flow signal effectively. In this embodiment, an input end of the bootstrap circuit is electrically connected to an output end of the first low-pass filter, and an output end of the self-checking circuit is electrically connected to a first input end of the instrumentation amplifier and an input end of the voltage follower, respectively. Preferably, as shown in fig. 2, the bootstrap circuit includes: a resistor R1, a resistor R2, a capacitor C1 and an operational amplifier OPA 2130; specifically, the output end of the first low-pass filter is electrically connected to one end of a resistor R1 and a pin 3 of the operational amplifier OPA2130, the other end of the resistor R1 is electrically connected to one end of a resistor R2 and one end of a capacitor C1, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is electrically connected to a pin 2 and a pin 1 of the operational amplifier OPA2130, and the pin 1 of the operational amplifier OPA2130 is electrically connected to the first input end of the instrumentation amplifier and the input end of the voltage follower.
The voltage follower effectively shields external electromagnetic interference and electrostatic interference and realizes equipotential shielding. In this embodiment, the output end of the voltage follower is electrically connected to the shielding end of the electrode a through the outer shielding layer of the coaxial cable. In this embodiment, the voltage follower may adopt a circuit configuration as shown in fig. 2, where a _ shield represents an output of the voltage follower.
The second low-pass filter filters high-frequency noise on the electrode A, extracts flow signals from environmental noise, reduces the environmental noise and the noise of the electromagnetic flowmeter, and improves the signal-to-noise ratio. The electrode signal input end of the electrode B is electrically connected with the input end of the second low-pass filter through a central copper wire of the coaxial cable shielding wire, and the output end of the second low-pass filter is electrically connected with the second input end of the instrument amplifier through the second bootstrap follower. In order to ensure that the noises of the left and right electrode signal detection circuits are consistent, in the embodiment, the first low-pass filter and the second low-pass filter have the same structure, and when the circuits are arranged, the first low-pass filter and the second low-pass filter are symmetrically arranged, so that the interference caused by the difference between the circuit structures is reduced as much as possible, and the measurement accuracy of the whole system is influenced.
And the second bootstrap follower is used for accurately extracting the flow signal output by the second low-pass filter. In this embodiment, the first bootstrap follower and the second bootstrap follower have the same structure, and in the layout, the first bootstrap follower and the second bootstrap follower minimize interference caused by differences between circuit structures, thereby affecting the measurement accuracy of the entire system. The structure of the second bootstrap follower will not be described in detail herein.
The instrument amplifier effectively suppresses common mode noise. In this embodiment, the instrumentation amplifier may be implemented by using the prior art, and preferably, a circuit structure of the instrumentation amplifier may be a circuit as shown in fig. 3, where a _ Signal is a flow Signal output by the first bootstrap follower, B _ Signal is a flow Signal output by the second bootstrap follower, and output is an output of the instrumentation amplifier and is also an input of the band pass filter.
And the band-pass filter is used for carrying out filtering amplification and rectification adjustment processing on the flow signal amplified by the instrument amplifier, so that the signal-to-noise ratio of the flow signal is effectively improved. Can be implemented by using the prior art, and will not be described in detail herein.
The working principle of the embodiment is as follows: a flow signal on an electrode A of the electromagnetic flowmeter is filtered by a first low-pass filter to remove high-frequency noise and is extracted by a first bootstrap follower, the first bootstrap follower sends the extracted flow signal to a first input end of an instrument amplifier, and meanwhile, the flow signal is sent to a voltage follower in the first bootstrap follower for eliminating an external interference signal;
the flow signal on the electrode B of the electromagnetic flowmeter passes through the second low-pass filter to filter high-frequency noise, and is extracted by the second bootstrap follower, the second bootstrap follower sends the flow signal who extracts to the second input of instrumentation amplifier, simultaneously with the voltage follower that this flow signal sent in the second bootstrap follower be used for eliminating external interference signal, the instrumentation amplifier is with flow signal on the electrode A and the flow signal on the electrode B do the difference and amplify and handle, the signal after the amplification carries out the analog input of outputting to the controller after band-pass filter carries out the plastic, because the controller carries out digital signal processing, obtain flow information.
The beneficial effect of this embodiment does: the first low-pass filter and the second low-pass filter are arranged, so that high-frequency signals in the flow signals on the electrode A and the electrode B can be filtered respectively, the flow signals are extracted from environmental noise, the environmental noise and the noise of the electromagnetic flowmeter are reduced, and the signal-to-noise ratio is improved;
by arranging the first bootstrap follower and the second bootstrap follower, flow signals on the electrode A and the electrode B can be effectively obtained, equipotential shielding is realized, and external electromagnetic interference and electrostatic interference are effectively shielded;
by arranging the instrument amplifier, common-mode noise can be effectively inhibited;
and a band-pass filter is arranged to carry out filtering amplification and rectification adjustment processing on the flow signal amplified by the instrument amplifier, so that the signal-to-noise ratio of the flow signal is effectively improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a slip casting machine flow detecting system, its includes electromagnetic flowmeter, controller and signal conditioning circuit, electromagnetic flowmeter includes electrode A and electrode B, its characterized in that: the signal conditioning circuit comprises a first low-pass filter, a second low-pass filter, a first bootstrap follower, a second bootstrap follower and an instrument amplifier;
the input end of the first low-pass filter is electrically connected with the electrode A, and the output end of the first low-pass filter is electrically connected with the first input end of the instrument amplifier through a first bootstrap follower;
the input end of the second low-pass filter is electrically connected with the electrode B, and the output end of the second low-pass filter is electrically connected with the second input end of the instrument amplifier through a second bootstrap follower;
the output end of the instrument amplifier is electrically connected with the analog input end of the controller.
2. A grouting machine flow detection system as claimed in claim 1, characterized in that: and the electrode A and the electrode B are both electrically connected with the electromagnetic flowmeter through coaxial cable shielding wires.
3. A grouting machine flow detection system as claimed in claim 2, characterized in that: the electrode A and the electrode B both comprise an electrode signal input end and an electrode shielding end;
the electrode signal input end of the electrode A is electrically connected with the input end of the first low-pass filter through a central copper wire of a coaxial cable shielding wire;
and the electrode signal input end of the electrode B is electrically connected with the input end of the second low-pass filter through a central copper wire of the coaxial cable shielding wire.
4. A grouting machine flow detection system as claimed in claim 3, characterized in that: the first low-pass filter comprises a resistor R17, a resistor R18, a capacitor C8 and an operational amplifier AD 8656;
the electrode signal input end of the electrode A is electrically connected with the in-phase input end of the operational amplifier AD8656 through the resistor R17, one end of the resistor R18 is electrically connected with the electrode input end of the electrode A, one end of the capacitor C8 is electrically connected with the in-phase input end of the operational amplifier AD8656, the other end of the resistor R18 and the other end of the capacitor C8 are both grounded, the inverting input end of the operational amplifier AD8656 is electrically connected with the output end of the operational amplifier AD8656, and the output end of the operational amplifier AD8656 is electrically connected with the first input end of the instrumentation amplifier through the first bootstrap follower.
5. A grouting machine flow detection system as claimed in claim 3, characterized in that: the first bootstrap follower comprises a bootstrap circuit and a voltage follower;
the output end of the first low-pass filter is electrically connected with the first input end of the instrumentation amplifier and the input end of the voltage follower through the bootstrap circuit respectively, and the output end of the voltage follower is electrically connected with the shielding end of the electrode A through the outer shielding layer of the coaxial cable.
6. A grouting machine flow detection system as claimed in claim 5, characterized in that: the bootstrap circuit includes: a resistor R1, a resistor R2, a capacitor C1 and an operational amplifier OPA 2130;
the output end of the first low-pass filter is electrically connected with one end of a resistor R1 and a pin 3 of an operational amplifier OPA2130 respectively, the other end of a resistor R1 is electrically connected with one end of a resistor R2 and one end of a capacitor C1 respectively, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is electrically connected with a pin 2 and a pin 1 of the operational amplifier OPA2130 respectively, and the pin 1 of the operational amplifier OPA2130 is electrically connected with a first input end of an instrumentation amplifier and an input end of a voltage follower respectively.
7. A grouting machine flow detection system as claimed in claim 1, characterized in that: also includes a band-pass filter;
the band-pass filter is connected in series in a line between the output of the instrumentation amplifier and the analog input of the controller.
8. A grouting machine flow detection system as claimed in claim 1, characterized in that: the first low-pass filter and the second low-pass filter have the same structure, the first bootstrap follower and the second bootstrap follower have the same structure, and the first low-pass filter, the second low-pass filter, the first bootstrap follower and the second bootstrap follower are symmetrically arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022150868.3U CN212807171U (en) | 2020-09-27 | 2020-09-27 | Flow detection system of grouting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022150868.3U CN212807171U (en) | 2020-09-27 | 2020-09-27 | Flow detection system of grouting machine |
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| Publication Number | Publication Date |
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| CN212807171U true CN212807171U (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022150868.3U Active CN212807171U (en) | 2020-09-27 | 2020-09-27 | Flow detection system of grouting machine |
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| CN (1) | CN212807171U (en) |
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- 2020-09-27 CN CN202022150868.3U patent/CN212807171U/en active Active
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