CN109899342B - Hydraulic safety early warning system - Google Patents
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Abstract
The invention provides a hydraulic safety early warning system, which belongs to the technical field of electronic circuits and comprises a pressure relief valve arranged on a hydraulic pipeline, wherein a pressure relief sensor is arranged on a valve clack of the pressure relief valve.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a hydraulic safety early warning system.
Background
In the hydraulic system, when the pressure of equipment or a pipeline exceeds a specified safety value, for example, the reversing of the actuating element and the closing of a valve enable flowing liquid to generate an instantaneous pressure peak value due to the insensitivity of inertia and the reaction action of certain hydraulic elements, the peak value can exceed several times of working pressure, at the moment, the pressure of a hydraulic pipeline needs to be relieved, a common method is that a pressure relief valve is arranged on the hydraulic pipeline, an existing pressure relief valve overpressure automatic monitoring and early warning device senses a pressure relief touch signal by using a pressure relief sensor and sends the pressure relief touch signal to a microprocessor, and finally the microprocessor controls an alarm. However, in the actual use process, because hydraulic impact phenomenon often occurs in a hydraulic pipeline, the abrupt change of the liquid flow speed causes vibration of a hydraulic system, high-frequency clutter interference such as noise is generated, and signal environment noise generated by power interference of an electronic control module can bring great interference to detection signals of a pressure relief sensor, so that stability of signal transmission is influenced, even false early warning is caused, and reliability of the automatic monitoring and early warning device for overpressure of a pressure relief valve is influenced.
To above-mentioned circumstances, this patent provides a hydraulic pressure safety precaution system, including setting up the relief valve on the hydraulic pressure pipeline, set up pressure release sensor on the valve clack of relief valve, pressure release sensor connects early warning signal processing module, early warning signal processing module is including pressure release signal filter circuit, double-circuit amplification regulation circuit and the early warning circuit that connect gradually, improves signal amplification efficiency, effectively suppresses signal environmental noise.
Disclosure of Invention
The invention provides a hydraulic safety early warning system, which adopts an electronic early warning circuit to carry out safety early warning on hydraulic safety by sequentially connecting a pressure relief signal filter circuit, a double-path amplification regulating circuit and an early warning circuit, and improves early warning efficiency.
The invention provides a hydraulic safety early warning system, which comprises a pressure relief valve arranged on a hydraulic pipeline, wherein a pressure relief sensor is arranged on a valve clack of the pressure relief valve, the pressure relief sensor is connected with an early warning signal processing module, and the early warning signal processing module comprises a pressure relief signal filtering circuit, a double-path amplifying and regulating circuit and an early warning circuit which are sequentially connected; the filter circuit comprises a capacitor C1, an inductor L1, a capacitor C2, a capacitor C3 and a resistor R2, wherein one end of the capacitor C1 is connected with a signal output end of the pressure relief sensor, the inductor L1 and the capacitor C2 are connected in parallel to form a parallel resonance loop, a fixed resonance frequency exists, when the frequency of an alternating current signal added at two ends of the parallel resonance loop is the same as the resonance frequency, the maximum impedance is presented, one end of the parallel connection of the inductor L1 and the capacitor C2 is connected with the other end of the capacitor C1, the other end of the parallel connection of the inductor L1 and the capacitor C2 is connected with one ends of the capacitor C3 and the resistor R2, and the other ends of the capacitor C3 and the resistor R2 are respectively grounded.
The double-circuit amplification regulating circuit comprises an operational amplifier AR1 and an operational amplifier AR2, wherein the filter circuit is respectively connected with the operational amplifier AR1 and the operational amplifier AR2, the inverting input end 1 of the operational amplifier AR1 is connected with one end of a resistor R5 and a pin 1 of a rheostat RP1, the output end 3 of the operational amplifier AR1 is connected with the other end of the resistor R5 and is connected with the inverting input end 2 of the operational amplifier AR3 through a resistor R7, the inverting input end 1 of the operational amplifier AR2 is connected with one end of a resistor R6 and the pin 2 of the rheostat RP1, the output end 3 of the operational amplifier AR2 is connected with the other end of the resistor R6 and is connected with the inverting input end 1 of the operational amplifier AR3 through a resistor R8, the inverting input end 2 of the operational amplifier AR3 is further grounded through a resistor R9, the pin 3 of the rheostat RP1 is connected with the inverting input end 2 of the operational amplifier AR4, and the output end 3 of the operational amplifier AR4 is connected with the output end of the operational amplifier AR4 through a capacitor C5 and is connected with the output end of the filter diode VD 1.
The early warning circuit comprises a diode VD2 and a diode VD3, wherein the anode of the diode VD2 is connected with the cathode of the diode VD3, the output end 3 of the operational amplifier AR3 and the cathode of the voltage stabilizing tube DZ2, the cathode of the diode VD2 is connected with a +5V power supply, the anode of the diode VD3 is grounded, and the anode of the voltage stabilizing tube DZ2 is connected with a wireless early warning module through a resistor R10 and is connected with an acousto-optic early warning module through a resistor R11.
Further, the filter circuit further includes a resistor R1, where the resistor R1 is connected in series with the capacitor C1, and is mainly used to absorb peak voltage, reduce interference, and provide a signal with high signal-to-noise ratio for the next stage.
Further, the two-way amplifying and adjusting circuit further comprises a capacitor C4 and a voltage stabilizing tube DZ1 which are connected in parallel, one end of the capacitor C4 and the voltage stabilizing tube DZ1 which are connected in parallel is connected with a pin 3 of the rheostat RP1, the other end of the capacitor C4 and the voltage stabilizing tube DZ1 which are connected in parallel is grounded, the voltage stabilizing tube DZ1 provides a stable direct current voltage, and after the capacitor C4 is connected in parallel, the filtering and the coupling through a power supply can be achieved.
Further, the circuit further comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with the output end of the filter circuit, the other end of the resistor R3 is connected with the non-inverting input end 2 of the operational amplifier AR1, one end of the resistor R4 is connected with the output end of the filter circuit, and the other end of the resistor R4 is connected with the non-inverting input end 2 of the operational amplifier AR 2.
Further, the wireless early warning module comprises a triode VT1, a base electrode of the triode VT1 is connected with a resistor R10, a collector electrode of the triode VT1 is sequentially connected with a +12V power supply and one end of a capacitor C6, the other end of the capacitor C6 is grounded, an emitter electrode of the triode VT1 is connected with a wireless signal emitter E1, and the types of the wireless signal emitters on the market are more at present, such as a DMX512 wireless signal emitter, a WiFi wireless signal emitter, a mobile phone card wireless signal emitter and the like.
Further, the acousto-optic early warning module comprises a bidirectional thyristor Q1, a control electrode of the bidirectional thyristor Q1 is connected with a resistor R11, one end of a main electrode of the bidirectional thyristor Q1 is connected with a +12V power supply, the other end of the main electrode of the bidirectional thyristor Q1 is connected with one end of a resistor R12 and one end of a resistor R13, the other end of the resistor R12 is grounded through an indicator light LED1, the other end of the resistor R13 is grounded through a buzzer LS1, and the type commonly used by the buzzer comprises an electromagnetic patch type buzzer, and the following types are most commonly used because of the characteristics of being ultra-small and thin: 5002. 5003, 7525, 8503, 0927, 0945 and 1370.
The invention provides a hydraulic safety early warning system, which comprises a pressure relief valve arranged on a hydraulic pipeline, wherein a pressure relief sensor is arranged on a valve clack of the pressure relief valve, the pressure relief sensor is connected with an early warning signal processing module, the early warning signal processing module comprises a pressure relief signal filtering circuit, a double-path amplifying regulating circuit and an early warning circuit which are sequentially connected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the system components of the present invention.
Fig. 2 is a schematic circuit configuration of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
As shown in fig. 1-2, the invention provides a hydraulic safety early warning system, which comprises a pressure relief valve arranged on a hydraulic pipeline, wherein a pressure relief sensor is arranged on a valve clack of the pressure relief valve, the pressure relief sensor is connected with an early warning signal processing module, and the early warning signal processing module comprises a pressure relief signal filtering circuit, a double-path amplifying and regulating circuit and an early warning circuit which are sequentially connected.
The output signal of the pressure relief sensor is sent into a pressure relief signal filter circuit to be subjected to filtering treatment, the pressure relief signal filter circuit comprises a capacitor C1, an inductor L1, a capacitor C2, a capacitor C3 and a resistor R2, one end of the capacitor C1 is connected with the signal output end of the pressure relief sensor, the other end of the capacitor C1 is connected with the capacitor C2, one end of the inductor L1 and the input end of a double-circuit amplification regulating circuit, the inductor L1 and the capacitor C2 are connected in parallel to form a parallel resonance circuit, a fixed resonance frequency is formed, the maximum impedance is presented when the frequency of alternating current signals at two ends of the parallel resonance circuit is the same as the resonance frequency, one end of the parallel connection of the inductor L1 and the capacitor C2 is connected with the other end of the capacitor C1, the other end of the parallel connection of the inductor L1 and the capacitor C2 is connected with one end of the resistor R2, the other end of the capacitor C3 and the other end of the resistor R2 are respectively grounded, and the output signal of the pressure relief sensor is sent into a filter formed by the capacitors C2, C3, the inductor L1 and the resistor R2 after being coupled with the capacitor C1, the filter is processed, and the filter is formed by the capacitor C2, the filter signal is high in accuracy and the interference frequency is improved in the process.
The output signals of the pressure release signal filter circuit are sent into a double-way amplification regulating circuit for amplification in two ways, one way is input into the in-phase input end 2 of the operational amplifier AR1 through a resistor R3, the other way is input into the in-phase input end 2 of the operational amplifier AR2 through a resistor R4, the output signals of the pressure release signal filter circuit are simultaneously amplified by the operational amplifier AR1 and AR2, the signal amplification efficiency is improved, the amplified signals are sent into the two input ends of the operational amplifier AR3 to further form differential mode input amplification, the signal environmental noise is inhibited, meanwhile, part of the output signals of the operational amplifier AR1 and AR2 are fed back through the operational amplifier AR4, the stability in the signal amplification process is greatly improved, the inverting input end 1 of the operational amplifier AR1 is connected with one end of a resistor R5 and the pin 1 of a rheostat RP1, the output end 3 of the operational amplifier AR1 is connected with the other end of the resistor R5, the in-phase input end 2 of the operational amplifier AR3 is connected with the resistor R7, the inverting input end 1 of the operational amplifier AR2 is connected with one end of a resistor R6 and a pin 2 of a rheostat RP1, the output end 3 of the operational amplifier AR2 is connected with the other end of the resistor R6 and is connected with the inverting input end 1 of the operational amplifier AR3 through a resistor R8, the non-inverting input end 2 of the operational amplifier AR3 is grounded through a resistor R9, the pin 3 of the rheostat RP1 is connected with the non-inverting input end 2 of an operational amplifier AR4, one end of a capacitor C4 and a cathode of a voltage stabilizing tube DZ1, the other end of the capacitor C4 is connected with an anode of the voltage stabilizing tube DZ1 in parallel, the output end 3 of the operational amplifier AR4 is connected with the inverting input end 1 of the operational amplifier AR4 through a capacitor C5 and is connected with the output end of a voltage releasing signal filter circuit through a diode VD1, wherein the feedback effect of the operational amplifier AR4 can be changed by adjusting the resistance of the rheostat RP1, the output signal range of the voltage releasing sensor with different types in the actual use process is convenient to adjust, the capacitor C4 and the voltage stabilizing tube DZ1 play a role in stabilizing signals at the input end of the operational amplifier AR4, and the capacitor C5 plays a role in compensating signals, so that the stability of the signals in the amplifying process is effectively guaranteed.
The early warning circuit comprises diodes VD2 and VD3, wherein the anode of the diode VD2 is connected with the output end of an operational amplifier AR3 and the cathode of a voltage stabilizing tube DZ2, the cathode of the diode VD2 is connected with a +5V power supply, the anode of the diode VD3 is grounded, the anode of the voltage stabilizing tube DZ2 is connected with a wireless early warning module through a resistor R10 and is connected with an acousto-optic early warning module through a resistor R11, the phenomenon of hydraulic impact frequently occurs in a hydraulic pipeline, the abrupt change of the liquid flow speed causes vibration of a hydraulic system and generates noise, when the pressure relief sensor detects abnormal high pressure, the voltage of an output signal is overlarge after the amplification of a double-circuit amplification regulating circuit, damage is caused to a later-stage circuit, a +5V power supply, the voltage stabilizing circuit is formed by the diodes VD2 and VD3, the output signal of the operational amplifier AR3 is clamped in the range of 0-5V, the electronic components of the later-stage circuit are effectively protected, and the voltage stabilizing tube DZ2 drives the later-stage signal to work as a control signal.
The early warning circuit comprises a diode VD2 and a diode VD3, wherein the anode of the diode VD2 is connected with the cathode of the diode VD3, the output end 3 of the operational amplifier AR3 and the cathode of the voltage stabilizing tube DZ2, the cathode of the diode VD2 is connected with a +5V power supply, the anode of the diode VD3 is grounded, and the anode of the voltage stabilizing tube DZ2 is connected with a wireless early warning module through a resistor R10 and is connected with an acousto-optic early warning module through a resistor R11.
The filter circuit further comprises a resistor R1, wherein the resistor R1 is connected with the capacitor C1 in series, and the filter circuit is mainly used for absorbing peak voltage, reducing interference and providing a signal with high signal-to-noise ratio for the next stage.
The double-circuit amplification regulating circuit further comprises a capacitor C4 and a voltage stabilizing tube DZ1 which are connected in parallel, one end of the capacitor C4 connected in parallel with the voltage stabilizing tube DZ1 is connected with a pin 3 of the rheostat RP1, the other end of the capacitor C4 connected in parallel with the voltage stabilizing tube DZ1 is grounded, the voltage stabilizing tube DZ1 provides a stable direct-current voltage, and after the capacitor C4 is connected in parallel, the filtering and the coupling through a power supply can be achieved.
The filter circuit further comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with the output end of the filter circuit, the other end of the resistor R3 is connected with the in-phase input end 2 of the operational amplifier AR1, one end of the resistor R4 is connected with the output end of the filter circuit, and the other end of the resistor R4 is connected with the in-phase input end 2 of the operational amplifier AR 2.
The wireless early warning module comprises a triode VT1, wherein a base electrode of the triode VT1 is connected with a resistor R10, a collector electrode of the triode VT1 is sequentially connected with a +12V power supply and one end of a capacitor C6, the other end of the capacitor C6 is grounded, and an emitter electrode of the triode VT1 is connected with a wireless signal emitter E1.
The acousto-optic early warning module comprises a bidirectional thyristor Q1, wherein a control electrode of the bidirectional thyristor Q1 is connected with a resistor R11, one end of a main electrode of the bidirectional thyristor Q1 is connected with a +12V power supply, the other end of the main electrode of the bidirectional thyristor Q1 is connected with a resistor R12 and one end of a resistor R13, the other end of the resistor R12 is grounded through an indicator light LED1, and the other end of the resistor R13 is grounded through a buzzer LS 1.
When the pressure of the hydraulic pipeline exceeds a specified safety range value, the valve clack of the pressure relief valve is jacked to an opening height, then the valve is automatically opened to relieve pressure, at the moment, the pressure relief sensor detects pressure mutation and converts the pressure mutation into an electric signal to be output, the signal is processed by the pressure relief signal filtering circuit and the double-way amplifying and adjusting circuit and has good accuracy and stability, and then the signal is output to the base electrode of the triode VT1 and the control electrode of the bidirectional thyristor Q1 after being clamped and stabilized in the early warning circuit, so that the triode VT1 and the bidirectional thyristor Q1 are simultaneously conducted, and a wireless signal transmitter E1 in the wireless early warning module remotely transmits an early warning signal to a terminal early warning server to remind a background worker to make early warning treatment; in the working process of the acousto-optic early warning module, the indicating lamp LED1 and the buzzer LS1 are electrified to send out an acousto-optic warning signal, so that on-site overhauling personnel are reminded of timely overhauling the hydraulic pipeline.
In summary, the following beneficial effects may be at least achieved by the embodiments of the present invention:
1. the circuit design of the invention is ingenious, the selected electronic components are small and exquisite and economical and easy to realize, the output signals of the pressure relief signal filter circuit are sent into the double-channel amplification regulating circuit for amplification in two ways, the operational amplifiers AR1 and AR2 amplify the output signals of the pressure relief signal filter circuit at the same time, the signal amplification efficiency is improved, the amplified signals are sent into the two input ends of the operational amplifier AR3 to further form differential mode input amplification, the signal environmental noise is effectively inhibited, a part of the output signals of the operational amplifiers AR1 and AR2 are fed back through the operational amplifier AR4, and the stability in the signal amplification process is greatly improved.
2. The output signal of the pressure relief sensor is sent into a pressure relief signal filter circuit for filtering treatment, and the high-frequency interference of the signal in the transmission process is reduced by utilizing the low frequency of the high frequency resistance of the capacitor and the high frequency of the low frequency resistance of the inductor, so that the accuracy of the signal is improved.
3. The resistance value of the rheostat RP1 is adjusted to change the feedback effect of the operational amplifier AR4, and when the output signal ranges of the pressure relief sensors with different models are different in the actual use process, the adjustment is convenient, and the operation is simple.
4. And the early warning circuit utilizes the voltage stabilizing effect and the clamping effect to clamp and output the output signal after the amplification of the double-circuit amplification regulating circuit, so that the damage to the rear-stage circuit when the pressure relief sensor detects abnormal high pressure is avoided, and the electronic components of the rear-stage circuit are effectively protected.
5. The early warning circuit adopts a wireless early warning module and an acousto-optic early warning module to form double early warning, and a wireless signal transmitter E1 in the wireless early warning module remotely transmits an early warning signal to a terminal early warning server to remind a background worker to perform early warning treatment; in the working process of the acousto-optic early warning module, the indicating lamp LED1 and the buzzer LS1 are electrified to send out an acousto-optic warning signal, so that on-site overhauling personnel are reminded of timely overhauling a hydraulic pipeline, and the early warning effect is more effective and reliable.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (4)
1. The hydraulic safety early warning system comprises a pressure relief valve arranged on a hydraulic pipeline, wherein a pressure relief sensor is arranged on a valve clack of the pressure relief valve, and the hydraulic safety early warning system is characterized in that the pressure relief sensor is connected with an early warning signal processing module, and the early warning signal processing module comprises a pressure relief signal filtering circuit, a double-path amplifying and adjusting circuit and an early warning circuit which are sequentially connected; wherein,
the filter circuit comprises a capacitor C1, an inductor L1, a capacitor C2, a capacitor C3 and a resistor R2, wherein one end of the capacitor C1 is connected with a signal output end of the pressure relief sensor, the inductor L1 and the capacitor C2 are connected in parallel, one end of the inductor L1 and the capacitor C2 which are connected in parallel is connected with the other end of the capacitor C1, the other end of the inductor L1 and the capacitor C2 which are connected in parallel is connected with one end of the capacitor C3 and one end of the resistor R2, and the other ends of the capacitor C3 and the resistor R2 are respectively grounded;
the double-path amplification regulating circuit comprises an operational amplifier AR1 and an operational amplifier AR2, wherein the filter circuit is respectively connected with the operational amplifier AR1 and the non-inverting input end 2 of the operational amplifier AR2, the non-inverting input end 1 of the operational amplifier AR1 is connected with one end of a resistor R5 and a pin 1 of a rheostat RP1, the output end 3 of the operational amplifier AR1 is connected with the other end of the resistor R5 and is connected with the non-inverting input end 2 of the operational amplifier AR3 through a resistor R7, the non-inverting input end 1 of the operational amplifier AR2 is connected with one end of a resistor R6 and the pin 2 of the rheostat RP1, the output end 3 of the operational amplifier AR2 is connected with the other end of the resistor R6 and is connected with the non-inverting input end 1 of the operational amplifier AR3 through a resistor R8, the non-inverting input end 2 of the operational amplifier AR3 is also grounded through a resistor R9, the pin 3 of the rheostat RP1 is connected with the non-inverting input end 2 of the operational amplifier AR4, and the output end 3 of the operational amplifier AR4 is connected with the output end of the filter diode VD1 through a capacitor C5;
the early warning circuit comprises a diode VD2 and a diode VD3, wherein the anode of the diode VD2 and the cathode of the diode VD3 are connected with the output end 3 of the operational amplifier AR3 and the cathode of the voltage stabilizing tube DZ2, the cathode of the diode VD2 is connected with a +5V power supply, the anode of the diode VD3 is grounded, and the anode of the voltage stabilizing tube DZ2 is connected with a wireless early warning module through a resistor R10 and is connected with an acousto-optic early warning module through a resistor R11;
the wireless early warning module comprises a triode VT1, wherein a base electrode of the triode VT1 is connected with a resistor R10, a collector electrode of the triode VT1 is sequentially connected with a +12V power supply and one end of a capacitor C6, the other end of the capacitor C6 is grounded, an emitter electrode of the triode VT1 is connected with a wireless signal emitter E1, and the model of the wireless signal emitter is DMX512;
the acousto-optic early warning module comprises a bidirectional thyristor Q1, wherein a control electrode of the bidirectional thyristor Q1 is connected with a resistor R11, one end of a main electrode of the bidirectional thyristor Q1 is connected with a +12V power supply, the other end of the main electrode of the bidirectional thyristor Q1 is connected with a resistor R12 and one end of a resistor R13, the other end of the resistor R12 is grounded through an indicator light LED1, and the other end of the resistor R13 is grounded through a buzzer LS 1.
2. The hydraulic safety warning system according to claim 1, wherein the filter circuit further comprises a resistor R1, the resistor R1 being connected in series with the capacitor C1.
3. The hydraulic safety warning system according to claim 2, wherein the two-way amplification adjusting circuit further comprises a capacitor C4 and a regulator tube DZ1 connected in parallel, one end of the capacitor C4 and the regulator tube DZ1 connected in parallel is connected to the pin 3 of the varistor RP1, and the other end of the capacitor C4 and the regulator tube DZ1 connected in parallel is grounded.
4. The hydraulic safety warning system according to claim 3, further comprising a resistor R3 and a resistor R4, wherein one end of the resistor R3 is connected to the output end of the filter circuit, the other end of the resistor R3 is connected to the in-phase input end 2 of the operational amplifier AR1, one end of the resistor R4 is connected to the output end of the filter circuit, and the other end of the resistor R4 is connected to the in-phase input end 2 of the operational amplifier AR 2.
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