CN219488688U - Scraper machine fault monitoring system - Google Patents
Scraper machine fault monitoring system Download PDFInfo
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- CN219488688U CN219488688U CN202320262622.6U CN202320262622U CN219488688U CN 219488688 U CN219488688 U CN 219488688U CN 202320262622 U CN202320262622 U CN 202320262622U CN 219488688 U CN219488688 U CN 219488688U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The utility model relates to the technical field of fault monitoring, and provides a scraper machine fault monitoring system which comprises a control unit, a wireless communication unit and an eddy current displacement monitoring circuit, wherein the eddy current displacement monitoring circuit is connected with the control unit, the control unit is connected with a monitoring terminal by means of the wireless communication unit, the eddy current displacement monitoring circuit comprises a triode Q1, a field effect tube Q2, a diode D1, a capacitor C1 and an inductor L1, the base electrode of the triode Q1 is connected with the control unit, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with the grid electrode of the field effect tube Q2, the source electrode of the field effect tube Q2 is connected with a 15V power supply, the drain electrode of the field effect tube Q2 is connected with the anode of the diode D1, the cathode of the diode D1 is grounded by the capacitor C1, the cathode of the diode D1 is grounded by the inductor L1, and the cathode of the diode D1 is connected with the control unit. Through the technical scheme, the problem that the traditional eddy current monitoring technology in the prior art is not fast enough in monitoring speed is solved.
Description
Technical Field
The utility model relates to the technical field of fault monitoring, in particular to a scraper machine fault monitoring system.
Background
The scraper is mainly applied to the coal face and can timely transport and separate raw coal, gangue and the like cut by the coal cutter. The device has the advantages of flexible assembly, large conveying capacity, high conveying efficiency, higher safety and important effect on the production of coal mines. But the frequency of faults of the scraper machine in the use process is higher, so that the online monitoring of the faults of the scraper machine is of great significance. If the tail and the head of the scraper machine are not pressed stably, the tail and the head of the scraper machine are tilted away from faults, an eddy current monitoring technology can be adopted for monitoring the tail and the head of the scraper machine, and the displacement conditions of the tail and the head of the scraper machine are monitored by utilizing the displacement monitoring principle, so that the tail and the head of the scraper machine are tilted away from the ground faults. However, the traditional eddy current monitoring technology has the problem that the monitoring speed is not fast enough, along with the continuous progress of technology, the requirements of people on the quality of materials and products are continuously improved, and the problem existing in the traditional eddy current monitoring technology makes the eddy current monitoring result incapable of meeting the demands of people.
Disclosure of Invention
The utility model provides a scraper machine fault monitoring system, which solves the problem that the traditional eddy current monitoring technology in the prior art is not fast enough in monitoring speed.
The technical scheme of the utility model is as follows:
the scraper machine fault monitoring system comprises a control unit, a wireless communication unit and an eddy current displacement monitoring circuit, wherein the eddy current displacement monitoring circuit is connected with the control unit, the control unit is connected with a monitoring terminal by means of the wireless communication unit, the eddy current displacement monitoring circuit comprises a resistor R19, a resistor R1, a resistor R2, a triode Q1, a field effect tube Q2, a resistor R3, a diode D1, a capacitor C1 and an inductor L1,
the base of the triode Q1 is connected with the control unit through the resistor R19, the emitter of the triode Q1 is grounded, the collector of the triode Q1 is connected with the grid of the field effect tube Q2 through the resistor R1, the source of the field effect tube Q2 is connected with a 15V power supply, the source of the field effect tube Q2 is connected with the grid of the field effect tube Q2, the drain of the field effect tube Q2 is connected with the anode of the diode D1 through the resistor R3, the cathode of the diode D1 is grounded through the capacitor C1, the cathode of the diode D1 is grounded through the inductor L1, and the cathode of the diode D1 is connected with the control unit.
Further, the utility model further comprises a rectifying and amplifying circuit, wherein the rectifying and amplifying circuit comprises a resistor R4, a resistor R5, an operational amplifier U2, a diode D3, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier U3, the first end of the resistor R4 is connected with the cathode of the diode D1, the second end of the resistor R4 is connected with the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is grounded, the output end of the operational amplifier U2 is connected with the anode of the diode D2, the anode of the diode D2 is connected with the inverting input end of the operational amplifier U2, the output end of the operational amplifier U2 is connected with the cathode of the diode D3, the anode of the diode D3 is connected with the inverting input end of the operational amplifier U2 through the resistor R6, the inverting input end of the operational amplifier U3 is connected with the inverting input end of the operational amplifier U3 through the resistor R7, and the inverting input end of the operational amplifier U3 is connected with the control unit.
Further, the utility model also comprises a buffer circuit, wherein the buffer circuit comprises an operational amplifier U1, the non-inverting input end of the operational amplifier U1 is connected with the cathode of the diode D1, the output end of the operational amplifier U1 is connected with the inverting input end of the operational amplifier U1, and the output end of the operational amplifier U1 is connected with the first end of the resistor R4.
Further, the utility model also comprises a protection circuit, wherein the protection circuit comprises a resistor R23, a triode Q4, an optocoupler U8, a resistor R20, a resistor R22, a triode Q5 and a relay K1, wherein the base electrode of the triode Q4 is connected with the control unit through the resistor R23, the emitting electrode of the triode Q4 is grounded, the collecting electrode of the triode Q4 is connected with the first input end of the optocoupler U8, the second input end of the optocoupler U8 is connected with a 5V power supply, the first output end of the optocoupler U8 is connected with a 12V power supply through the resistor R20, the second output end of the optocoupler U8 is connected with the base electrode of the triode Q5 through the resistor R22, the emitting electrode of the triode Q5 is grounded, the collecting electrode of the triode Q5 is connected with the first input end of the relay K1, the second input end of the relay K1 is connected with the 12V power supply, the public end of the relay K1 is connected with the normally-off end of the relay K1, and the second output end of the relay K1 is connected with the external power supply.
Further, the vibration monitoring circuit comprises a vibration sensor U7, a resistor R11, a resistor R9, an operational amplifier U4, a resistor R13, a resistor R10, an operational amplifier U5, a resistor R12 and a rheostat RP1, wherein the inverting input end of the operational amplifier U4 is connected with the vibration sensor U7 through the resistor R11, the non-inverting input end of the operational amplifier U4 is grounded through the resistor R9, the output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U4 through the resistor R13, the output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U5 through the resistor R10, the non-inverting input end of the operational amplifier U5 is grounded through the resistor R12, the output end of the operational amplifier U5 is connected with the inverting input end of the operational amplifier U5 through the rheostat RP1, and the output end of the operational amplifier U5 is connected with the control unit.
Further, the vibration monitoring circuit in the utility model further comprises a resistor R14, a capacitor C3, a capacitor C4, a resistor R15, an operational amplifier U6, a resistor R17, a resistor R16 and a resistor R18, wherein a first end of the resistor R14 is connected with an output end of the operational amplifier U5, a second end of the resistor R14 is grounded through the capacitor C3, a second end of the resistor R14 is connected with an in-phase input end of the operational amplifier U6 through the capacitor C4, an in-phase input end of the operational amplifier U6 is grounded through the resistor R15, an inverting input end of the operational amplifier U6 is grounded through the resistor R16, an output end of the operational amplifier U6 is connected with an inverting input end of the operational amplifier U6 through the resistor R17, and an output end of the operational amplifier U6 is connected with the control unit.
The working principle and the beneficial effects of the utility model are as follows:
according to the utility model, whether the tail and the head of the scraper machine have tilting faults or not is monitored through the eddy current displacement monitoring circuit, namely, when the displacement of the tail and the head of the scraper machine exceeds a set value, the eddy current displacement monitoring circuit outputs an electric signal to the control unit, and the control unit sends the signal to the monitoring terminal through the wireless communication unit, so that a worker can conveniently and timely maintain the scraper machine.
Specifically, the working principle of the eddy current displacement monitoring circuit is as follows: during monitoring, the control unit outputs a PWM control signal to the base electrode of the triode Q1, when the PWM control signal is at a low level, the triode Q1 is cut off, the collector electrode of the triode Q1 is at a high level, and the field effect transistor Q2 is cut off; when the PWM control signal is at a high level, the triode Q1 is conducted, at the moment, the collector electrode of the triode Q1 is at a low level, the field effect transistor Q2 is conducted, the 12V power supply is respectively added to two ends of the capacitor C1 and the inductor L1 after passing through the field effect transistor Q2, the resistor R3 and the diode D1, and at the moment, the capacitor C1 and the inductor L1 start energy storage. When the PWM control signal is changed into low level again, the triode Q1 and the field effect tube Q2 are cut off, at the moment, the capacitor C1 and the inductor L1 form a free resonant circuit to perform mutual conversion of magnetic field energy and electric energy, a tested conductor senses a magnetic field, and at the moment, excitation response signals at two ends of the inductor L1 are in a damping oscillation state. When the distance between the tested conductor and the inductor L1 is longer, the induction magnetic field of the tested conductor is smaller, so that the reaction signal applied to the inductor L1 is smaller, and finally the signal is sent to the control unit, and the control unit can judge the displacement of the machine head and the machine tail of the scraper according to the reaction signal applied to the inductor L1.
Because the driving capability of the PWM control signal output by the control unit is limited, the initial energy cannot be directly provided for the resonant circuit formed by the capacitor C1 and the inductor L1, the 15V PWM control signal is added to the resonant circuit through the field effect transistor Q2, so that the initial energy is provided for the resonant circuit in a pulse form.
The utility model will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a circuit diagram of an eddy current displacement monitoring circuit in accordance with the present utility model;
FIG. 2 is a circuit diagram of a rectifying and amplifying circuit according to the present utility model;
FIG. 3 is a circuit diagram of a buffer circuit according to the present utility model;
FIG. 4 is a circuit diagram of the protection circuit of the present utility model;
FIG. 5 is a circuit diagram of a vibration monitoring circuit according to the present utility model;
fig. 6 is a circuit diagram of a filter circuit according to the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, this embodiment provides a scraper fault monitoring system, including a control unit, a wireless communication unit and an eddy current displacement monitoring circuit, the control unit is connected to the monitor terminal with the help of the wireless communication unit, the eddy current displacement monitoring circuit includes resistance R19, resistance R1, resistance R2, triode Q1, field effect transistor Q2, resistance R3, diode D1, electric capacity C1 and inductance L1, triode Q1's base passes through resistance R19 and connects the control unit, triode Q1's projecting pole ground, triode Q1's collecting electrode passes through resistance R1 and connects field effect transistor Q2's grid, field effect transistor Q2's source is connected 15V power, field effect transistor Q2's source is connected to field effect transistor Q2's grid, field effect transistor Q2's drain passes through resistance R3 and connects diode D1's positive pole, diode D1's negative pole passes through electric capacity C1 ground, diode D1's negative pole passes through inductance L1 ground, diode D1's cathode connects the control unit.
The tail and the head of the scraper (scraper conveyor) are easy to turn over, mainly because the tail and the head of the scraper are not stably pressed. Since the tail and head of the scraper conveyor are of welded parts and are not affected by the corresponding loading forces during operation of the scraper conveyor. In order to avoid the phenomenon that the tilting fault affects the coal mining progress, in the embodiment, whether the tilting fault exists in the tail and the head of the scraper machine or not is monitored through the eddy current displacement monitoring circuit, namely, when the displacement of the tail and the head of the scraper machine exceeds a set value, the eddy current displacement monitoring circuit outputs an electric signal to the control unit, and the control unit sends the signal to the monitoring terminal through the wireless communication unit, so that a worker can conveniently and timely maintain the scraper machine.
Because the machine head and the machine tail of the scraper machine are mainly tilted away from the ground, the electric vortex sensor is used as a displacement sensor, meanwhile, the electric vortex sensor is arranged at the machine head and the machine tail of the scraper machine, the metal shells of the machine head and the machine tail of the scraper machine are used as conductors to be tested, in the embodiment, the capacitor C1 and the inductor L1 form the electric vortex sensor, the inductor L1 is a hollow cylindrical coil, and the capacitor C1 and the inductor L1 are connected in parallel to form a free resonant circuit. When an excitation signal is input, a power supply provides energy for the capacitor C1 and the inductor L1, and the capacitor C1 and the inductor L1 store energy; when the excitation signal is turned off, the capacitor C1 and the inductor L1 form a free resonant circuit to perform mutual conversion of magnetic field energy and electric energy, and the excitation response signals at the two ends of the inductor L1 are in a damping oscillation state under the action of the induction magnetic field of the tested conductor. When the distance between the measured conductor and the inductor L1 is different, the magnitude of the induced magnetic field is different, the magnitude of the reaction to the inductor L1 is different, and the attenuation speeds of excitation response signals at two ends of the inductor L1 are different. Therefore, the magnitude of the displacement can be obtained by extracting the magnitude of the excitation response signal.
Specifically, the working principle of the eddy current displacement monitoring circuit is as follows: during monitoring, the control unit outputs a PWM control signal to the base electrode of the triode Q1, when the PWM control signal is at a low level, the triode Q1 is cut off, and the collector electrode of the triode Q1 is at a high level, so that the field effect transistor Q2 is cut off; when the PWM control signal is at a high level, the base electrode of the triode Q1 is at a high level, the triode Q1 is conducted, the collector electrode of the triode Q1 is at a low level, the field effect transistor Q2 is conducted, the 12V power supply is respectively added to the two ends of the capacitor C1 and the inductor L1 after passing through the field effect transistor Q2, the resistor R3 and the diode D1, and at the moment, the capacitor C1 and the inductor L1 start energy storage. When the PWM control signal is changed into low level again, the triode Q1 and the field effect tube Q2 are cut off, at the moment, the capacitor C1 and the inductor L1 form a free resonant circuit to perform mutual conversion of magnetic field energy and electric energy, a tested conductor senses a magnetic field, and at the moment, excitation response signals at two ends of the inductor L1 are in a damping oscillation state. When the distance between the tested conductor and the inductor L1 is longer, the induction magnetic field of the tested conductor is smaller, so that the reaction signal applied to the inductor L1 is smaller, and finally the signal is sent to the control unit, and the control unit can judge the displacement of the machine head and the machine tail of the scraper according to the reaction signal applied to the inductor L1.
Because the driving capability of the PWM control signal output by the control unit is limited, the initial energy cannot be directly provided for the resonant circuit formed by the capacitor C1 and the inductor L1, in this embodiment, the 15V PWM control signal is added to the resonant circuit through the field effect transistor Q2, so that the initial energy is provided for the resonant circuit in a pulse form, and in this embodiment, the pulse signal acts on the free resonant circuit, so that the initial energy can be provided for the free resonant circuit rapidly, thereby improving the monitoring speed of displacement.
As shown in fig. 2, the embodiment further includes a rectifying and amplifying circuit, where the rectifying and amplifying circuit includes a resistor R4, a resistor R5, an operational amplifier U2, a diode D3, a resistor R6, a resistor R7, a resistor R8, and an operational amplifier U3, the first end of the resistor R4 is connected to the cathode of the diode D1, the second end of the resistor R4 is connected to the inverting input end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is grounded, the output end of the operational amplifier U2 is connected to the anode of the diode D2, the anode of the diode D2 is connected to the inverting input end of the operational amplifier U2, the anode of the diode D3 is connected to the inverting input end of the operational amplifier U3 through the resistor R5, the inverting input end of the operational amplifier U3 is connected to the first end of the resistor R4 through the resistor R7, the non-inverting input end of the operational amplifier U3 is grounded, and the output end of the operational amplifier U3 is connected to the inverting input end of the operational amplifier U3 through the resistor R8.
In this embodiment, since the signal obtained by the eddy current monitoring process is a continuous alternating analog signal, which cannot be directly identified by the control unit, in this embodiment, a rectifying and amplifying circuit is added between the cathode of the diode D1 and the control unit, so as to convert the ac voltage into the dc fluctuating voltage, and at the same time amplify the voltage signal converted into the dc fluctuating voltage and send the amplified voltage signal to the control unit.
Specifically, the working principle of the rectifying and amplifying circuit is as follows: the resistor R4, the resistor R5, the operational amplifier U2, the diode D2 and the diode D3 form a half-wave rectifying circuit, and the resistor R6, the resistor R7, the resistor R8 and the operational amplifier U3 form an inverting addition circuit. When the signal input by the first end of the resistor R4 is in a positive half cycle, the diode D2 is cut off, the diode D3 is conducted, the operational amplifier U2 outputs a negative voltage signal, the operational amplifier U2 forms an inverting amplifying circuit, the anode of the diode D3 is a negative voltage signal, and the amplitude of the negative voltage signal is larger than that of the voltage signal of the first end of the resistor R4, so that the operational amplifier outputs a positive voltage signal; when the signal input at the first end of the resistor R4 is in the negative half cycle, the diode D2 is turned on, the diode D3 is turned off, the anode level of the diode D3 is 0, at this time, the input signal at the first end of the resistor R4 is added to the inverting input end of the op-amp U3 after passing through the resistor R7, at this time, the op-amp U3 forms an inverting amplifier, so that the op-amp U3 outputs a positive voltage signal.
In this embodiment, the full-wave rectifying circuit formed by the op-amp can not only play the same role as the bridge rectifying circuit, but also ensure the linearity and precision of rectification, and can also play the role of amplifying the voltage signal, and finally send the rectified and amplified signal to the control unit.
The voltage stabilizing tube U9 plays a role in protection and prevents the voltage entering the control unit from being too high.
As shown in fig. 3, the embodiment further includes a buffer circuit, where the buffer circuit includes an operational amplifier U1, the non-inverting input end of the operational amplifier U1 is connected to the cathode of the diode D1, the output end of the operational amplifier U1 is connected to the inverting input end of the operational amplifier U1, and the output end of the operational amplifier U1 is connected to the first end of the resistor R4.
In this embodiment, after the electric signal induced by the inductor L1 is processed by the rectifying and amplifying circuit, the resonant circuit at this time becomes a load circuit, the equivalent impedance of the load circuit can reduce the quality factor of the eddy current sensor, and the quality factor of the eddy current sensor will seriously affect the accuracy of displacement monitoring after being reduced, and the common solution is that the load circuit adopts a high impedance input circuit. Therefore, in order to avoid a significant reduction in the quality factor of the eddy current sensor, in this embodiment, a buffer circuit is added between the cathode of the diode D1 and the rectifying and amplifying circuit, and the operational amplifier U1 forms the buffer circuit for improving the input impedance of the rectifying and amplifying circuit.
As shown in fig. 4, the embodiment further includes a protection circuit, where the protection circuit includes a resistor R23, a triode Q4, an optocoupler U8, a resistor R20, a resistor R22, a triode Q5, and a relay K1, where the base of the triode Q4 is connected to the control unit through the resistor R23, the emitter of the triode Q4 is grounded, the collector of the triode Q4 is connected to the first input end of the optocoupler U8, the second input end of the optocoupler U8 is connected to a 5V power supply, the first output end of the optocoupler U8 is connected to a 12V power supply through the resistor R20, the second output end of the optocoupler U8 is connected to the base of the triode Q5 through the resistor R22, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected to the first input end of the relay K1, the second input end of the relay K1 is connected to a 12V power supply, the public end of the relay K1 is connected to the normally-closed end of the relay K1, and the external power supply is connected to the relay K1.
In this embodiment, in order to ensure safe operation of the scraper, when the displacement amount generated by the head and tail of the scraper exceeds a set value, the control unit sends an instruction to the protection circuit to disconnect the external power supply from the scraper, thereby avoiding causing a safety accident.
Specifically, the working principle of the protection circuit is as follows: when the displacement quantity generated by the machine head and the machine tail of the scraper exceeds a set value, the control unit outputs a high-level signal to the base electrode of the triode Q4, the triode Q4 is conducted, the optocoupler U8 is also conducted, the base electrode of the triode Q5 is a high-level signal, the triode Q5 is conducted, the relay K1 is electrified and sucked, the normally closed end of the relay K1 is disconnected, the scraper is disconnected from an external power supply, and the scraper stops working.
Meanwhile, the control unit sends a fault signal to the monitoring terminal. When the normally closed end of the relay K1 is disconnected, the public end of the relay K1 is connected with the normally open end of the relay K1, and at the moment, the light emitting diode LED1 emits an alarm light signal to warn the staff on site that the scraper machine fails.
As shown in fig. 5, the vibration monitoring circuit further includes a vibration sensor U7, a resistor R11, a resistor R9, an operational amplifier U4, a resistor R13, a resistor R10, an operational amplifier U5, a resistor R12 and a resistor RP1, the inverting input end of the operational amplifier U4 is connected to the vibration sensor U7 through the resistor R11, the non-inverting input end of the operational amplifier U4 is grounded through the resistor R9, the output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U4 through the resistor R13, the output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U5 through the resistor R10, the non-inverting input end of the operational amplifier U5 is grounded through the resistor R12, the output end of the operational amplifier U5 is connected to the inverting input end of the operational amplifier U5 through the resistor RP1, and the output end of the operational amplifier U5 is connected to the control unit.
In the working process of the scraper machine, equipment vibrates greatly, and when faults such as chain breakage and the like occur, parameters such as vibration frequency and the like are obviously changed, so that vibration signals can be monitored and analyzed by arranging vibration monitoring devices at a plurality of positions of the equipment, and the running state of the equipment is known.
In this embodiment, set up 3 vibration monitoring circuit, the circuit structure of 3 vibration monitoring circuit is the same, and the circuit theory of operation of arbitrary way is: the vibration sensor U7 is used for monitoring the vibration condition of the scraper machine and converting a vibration signal into an electric signal to be sent to the inverting input end of the operational amplifier U4, and the electric signal output by the vibration sensor U7 is weak and can not be directly identified by the control unit, so that the operational amplifier U4 forms an amplifying circuit, the electric signal output by the vibration sensor U7 is amplified and then sent to the inverting input end of the operational amplifier U5, and the operational amplifier U5 forms a second-stage amplifying circuit. Because the electric signal output by the vibration sensor U7 is weak, a large amount of noise interference is introduced by amplifying the weak signal to be large enough through the amplifying circuit, so that the vibration monitoring precision is influenced.
As shown in fig. 6, the vibration monitoring circuit in this embodiment further includes a resistor R14, a capacitor C3, a capacitor C4, a resistor R15, an operational amplifier U6, a resistor R17, a resistor R16, and a resistor R18, where a first end of the resistor R14 is connected to an output end of the operational amplifier U5, a second end of the resistor R14 is grounded through the capacitor C3, a second end of the resistor R14 is connected to an in-phase input end of the operational amplifier U6 through the capacitor C4, an in-phase input end of the operational amplifier U6 is grounded through the resistor R15, an inverting input end of the operational amplifier U6 is grounded through the resistor R16, an output end of the operational amplifier U6 is connected to an inverting input end of the operational amplifier U6 through the resistor R17, and an output end of the operational amplifier U6 is connected to the control unit.
In this embodiment, when monitoring the vibration condition of the scraper, the vibration sensor U7 may introduce vibration interference generated when other devices work, if the interference signal is amplified and sent to the control unit, the control unit may malfunction, so in order to accurately monitor the vibration condition of the scraper, a filter circuit is added in this embodiment, for filtering out which interference vibration signals. The resistor R14, the capacitor C3, the capacitor C4, the resistor R15, the operational amplifier U6, the resistor R17, the resistor R16 and the resistor R18 form a band-pass filter circuit, wherein the resistor R14 and the capacitor C3 form a low-pass filter circuit for filtering high-frequency clutter signals in the signals; the capacitor C4, the resistor R15, the operational amplifier U6, the resistor R17, the resistor R16 and the resistor R18 form a high-pass filter circuit for filtering noise signals in the signals. And finally, sending the filtered electric signals to a control unit.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (6)
1. The scraper machine fault monitoring system is characterized by comprising a control unit, a wireless communication unit and an eddy current displacement monitoring circuit, wherein the eddy current displacement monitoring circuit is connected with the control unit, the control unit is connected with a monitoring terminal by means of the wireless communication unit, the eddy current displacement monitoring circuit comprises a resistor R19, a resistor R1, a resistor R2, a triode Q1, a field effect tube Q2, a resistor R3, a diode D1, a capacitor C1 and an inductor L1,
the base of the triode Q1 is connected with the control unit through the resistor R19, the emitter of the triode Q1 is grounded, the collector of the triode Q1 is connected with the grid of the field effect tube Q2 through the resistor R1, the source of the field effect tube Q2 is connected with a 15V power supply, the source of the field effect tube Q2 is connected with the grid of the field effect tube Q2, the drain of the field effect tube Q2 is connected with the anode of the diode D1 through the resistor R3, the cathode of the diode D1 is grounded through the capacitor C1, the cathode of the diode D1 is grounded through the inductor L1, and the cathode of the diode D1 is connected with the control unit.
2. The scraper fault monitoring system according to claim 1, further comprising a rectifying and amplifying circuit, wherein the rectifying and amplifying circuit comprises a resistor R4, a resistor R5, an operational amplifier U2, a diode D3, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier U3, a first end of the resistor R4 is connected with a cathode of the diode D1, a second end of the resistor R4 is connected with an inverting input end of the operational amplifier U2, a non-inverting input end of the operational amplifier U2 is grounded, an output end of the operational amplifier U2 is connected with an anode of the diode D2, an anode of the diode D2 is connected with an inverting input end of the operational amplifier U2, an anode of the diode D3 is connected with an inverting input end of the operational amplifier U2 through the resistor R5, an anode of the diode D3 is connected with an inverting input end of the operational amplifier U3 through the resistor R6, an output end of the operational amplifier U3 is connected with an inverting input end of the resistor R3, and an output end of the operational amplifier U3 is connected with an inverting input end of the resistor R3.
3. The scraper fault monitoring system according to claim 2, further comprising a buffer circuit, wherein the buffer circuit comprises an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is connected to a cathode of the diode D1, an output terminal of the operational amplifier U1 is connected to an inverting input terminal of the operational amplifier U1, and an output terminal of the operational amplifier U1 is connected to a first terminal of the resistor R4.
4. The scraper fault monitoring system according to claim 1, further comprising a protection circuit, wherein the protection circuit comprises a resistor R23, a triode Q4, an optocoupler U8, a resistor R20, a resistor R22, a triode Q5 and a relay K1, wherein the base of the triode Q4 is connected with the control unit through the resistor R23, the emitter of the triode Q4 is grounded, the collector of the triode Q4 is connected with the first input end of the optocoupler U8, the second input end of the optocoupler U8 is connected with a 5V power supply, the first output end of the optocoupler U8 is connected with a 12V power supply through the resistor R20, the second output end of the optocoupler U8 is connected with the base of the triode Q5 through the resistor R22, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected with the first input end of the relay K1, the second input end of the relay K1 is connected with a 12V power supply, the first output end of the relay K1 is connected with the normally-closed terminal of the scraper, and the external scraper is connected with the external power supply.
5. The scraper fault monitoring system according to claim 1, further comprising a vibration monitoring circuit, wherein the vibration monitoring circuit comprises a vibration sensor U7, a resistor R11, a resistor R9, an operational amplifier U4, a resistor R13, a resistor R10, an operational amplifier U5, a resistor R12 and a varistor RP1, wherein an inverting input end of the operational amplifier U4 is connected with the vibration sensor U7 through the resistor R11, a non-inverting input end of the operational amplifier U4 is grounded through the resistor R9, an output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U4 through the resistor R13, an output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U5 through the resistor R10, a non-inverting input end of the operational amplifier U5 is grounded through the resistor R12, an output end of the operational amplifier U5 is connected with the inverting input end of the operational amplifier U5 through the varistor RP1, and an output end of the operational amplifier U5 is connected with the control unit.
6. The scraper fault monitoring system according to claim 5, wherein the vibration monitoring circuit further comprises a resistor R14, a capacitor C3, a capacitor C4, a resistor R15, an operational amplifier U6, a resistor R17, a resistor R16 and a resistor R18, a first end of the resistor R14 is connected to an output end of the operational amplifier U5, a second end of the resistor R14 is grounded through the capacitor C3, a second end of the resistor R14 is connected to an in-phase input end of the operational amplifier U6 through the capacitor C4, an in-phase input end of the operational amplifier U6 is grounded through the resistor R15, an inverting input end of the operational amplifier U6 is grounded through the resistor R16, an output end of the operational amplifier U6 is connected to an inverting input end of the operational amplifier U6 through the resistor R17, and an output end of the operational amplifier U6 is connected to the control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320262622.6U CN219488688U (en) | 2023-02-14 | 2023-02-14 | Scraper machine fault monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320262622.6U CN219488688U (en) | 2023-02-14 | 2023-02-14 | Scraper machine fault monitoring system |
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| CN219488688U true CN219488688U (en) | 2023-08-08 |
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