CN114111984B - Dynamic weighing device for loader - Google Patents
Dynamic weighing device for loader Download PDFInfo
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- CN114111984B CN114111984B CN202111352701.8A CN202111352701A CN114111984B CN 114111984 B CN114111984 B CN 114111984B CN 202111352701 A CN202111352701 A CN 202111352701A CN 114111984 B CN114111984 B CN 114111984B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/021—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles having electrical weight-sensitive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/028—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles combined with shock-absorbing devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention relates to a dynamic weighing device for a loader, wherein an adjustable notch filter circuit receives a pressure signal of a movable arm hydraulic cylinder of the loader, which is detected by a pressure sensor, and detects the oil pressure temperature by a thermistor, then the pressure signal is input into an adjustable notch filter to carry out notch filtering and amplitude limiting on a vibration frequency signal, the vibration frequency signal is output to a signal compensation circuit, the signal is multiplied by a pressure sensor working frequency waveform generated by a waveform generator, the pressure sensor working frequency signal is extracted, then the temperature drift compensation and the gain compensation are carried out by a second differential amplifier, finally the pressure signal is isolated and then is input into a CPU central controller, the problem of inaccurate measurement caused by the influence of temperature and vibration noise is solved, the vibration frequency amplitude detection circuit detects a vibration signal when the loader works by a vibration sensor, one path of the vibration signal is converted into voltage by a frequency-voltage converter and is input into the adjustable notch filter after the vibration frequency is adjusted, and the other path of the vibration signal is input into a second differential amplifier after the vibration peak value is obtained by an amplitude detection circuit.
Description
Technical Field
The invention relates to the technical field of loaders, in particular to a dynamic weighing device for a loader.
Background
The existing loader weighing system principle is that the linear proportional relation between the working pressure value of a movable arm oil cylinder hydraulic system and the weight of the shoveled materials is utilized, an electric signal is transmitted to a CPU central controller by a weight data acquisition unit (pressure sensor), and the weight of the materials is obtained through calculation and dynamic.
Because the pressure sensor is arranged on the oil inlet or return oil path of the movable arm oil cylinder, the working pressure value signal detected by the pressure sensor is extremely easy to be influenced by temperature, and is measured in the dynamic operation of the loader, and is easy to be influenced by vibration noise of the loader, so that the weight of the obtained material is not accurate enough.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention aims to provide a dynamic weighing device for a loader, which effectively solves the problem that the weight of the obtained material is not accurate enough due to the influence of temperature and vibration noise in the prior art.
The technical scheme includes that the adjustable notch filter circuit comprises an adjustable notch filter circuit, a signal compensation circuit and a vibration frequency amplitude detection circuit, wherein the adjustable notch filter circuit adopts a first differential amplifier to receive a pressure signal of a movable arm hydraulic cylinder of a loader, which is detected by a pressure sensor, and a thermistor to detect oil pressure temperature, then the pressure signal enters the adjustable notch filter to carry out notch filtering on a vibration frequency signal, and finally the pressure signal is output after being limited by a double diode;
the signal compensation circuit receives the signal after the amplitude limiting of the double diodes, and the signal enters a multiplier to be multiplied by the working frequency waveform of the pressure sensor generated by the waveform generator, the working frequency signal of the pressure sensor is extracted, then the temperature drift compensation and the gain compensation are carried out through a second differential amplifier, and finally the signal enters a Central Processing Unit (CPU) after being isolated;
the vibration frequency amplitude detection circuit adopts a vibration sensor to detect vibration signals when the loader works, after the vibration signals are subjected to tunable frequency, one path of the vibration signals is converted into voltage through a frequency-voltage converter, the voltage is added to an adjustable notch filter, the frequency of the notch filter is adjusted, the other path of the vibration signals is subjected to amplitude detection circuit to obtain vibration peak values, and the vibration peak values are added to a second differential amplifier, so that the gain of the second differential amplifier is adjusted.
The beneficial effects of the invention are as follows: a first differential amplifier is adopted to receive a pressure signal of a movable arm hydraulic cylinder of the loader, which is detected by a pressure sensor, and to receive an oil pressure temperature signal, then the pressure signal is subjected to notch filtering and double-diode amplitude limiting by an adjustable notch filter, and then the pressure signal enters a multiplier to be multiplied by a pressure sensor working frequency waveform generated by a waveform generator so as to extract a pressure sensor working frequency signal from a noise signal, then the pressure signal is subjected to temperature drift compensation and gain compensation by a second differential amplifier, and finally the pressure signal enters a CPU central controller after being isolated by a photoelectric coupler U1, so that the problem that the weight of a obtained material is not accurate enough due to the influence of temperature and vibration noise is solved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying fig. 1. The following embodiments are described in detail with reference to the drawings.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The first embodiment is a dynamic weighing device for a loader, comprising an adjustable notch filter circuit, a signal compensation circuit and a vibration frequency amplitude detection circuit, wherein the adjustable notch filter circuit adopts a first differential amplifier to receive a pressure signal of a movable arm hydraulic cylinder of the loader, which is detected by a pressure sensor, and receives a thermistor to detect an oil pressure temperature signal, and then enters the adjustable notch filter through a capacitor C4 to carry out notch filtering on a vibration frequency signal, the pressure signal is allowed to pass through, wherein the frequency of the notch filtering is controlled by grid voltages applied to field effect transistors T1 and T2, and finally the frequency is output after being limited by a double diode formed by diodes D1 and D2;
the signal compensation circuit receives the signal after the amplitude limiting of the double diodes, the signal enters a multiplier and is multiplied by the working frequency waveform of the pressure sensor generated by the waveform generator, so that the working frequency signal of the pressure sensor is extracted from the noise signal, then the temperature drift compensation and the gain compensation are carried out through a second differential amplifier, finally the signal is isolated through a photoelectric coupler U1 and then enters a CPU central controller, the problem that the weight of materials is inaccurate due to the influence of temperature and vibration noise is solved, specifically, the temperature drift compensation converts the temperature of a movable arm hydraulic cylinder of the detected loader into a resistance value according to the relation of the piezoresistive coefficient of the pressure sensor and the temperature in the same direction, the amplifier converts the temperature of the movable arm hydraulic cylinder into a proportional voltage, the voltage signal is fed into an inverting input end of an operational amplifier AR5 after being followed by a triode Q1, so that the temperature drift problem of the pressure sensor is eliminated through the temperature compensation, the gain compensation is controlled by the grid voltage fed into a field effect tube T3, the grid voltage is high when the amplitude of the vibration signal is large, the resistance value between the field effect tube T3 is small, the leakage source is further reduced, the resistance value after the amplitude of the differential amplifier is parallel connected with a resistor R12 is reduced, the amplitude of the signal is prevented from being submerged, and the amplitude of the amplified differential amplifier is increased;
the vibration frequency amplitude detection circuit adopts a vibration sensor to detect vibration signals when the loader works, the vibration frequency detected by the vibration sensor is tuned by a variable frequency tuning network, a diode D3 outputs low voltage (zero or close to zero) when in harmonic frequency, a triode Q3 is conducted, a triode Q2 is conducted, one path of the vibration signals in harmonic frequency enters a frequency-voltage converter to be converted into voltage in direct proportion to input frequency, the voltage is added to grids of field effect transistors T1 and T2, the notch filtering frequency of an adjustable notch filter is regulated, the other path of the vibration signals is obtained through an amplitude detection circuit, the peak value of the vibration signals is added to the grid of a field effect transistor T3 in a second differential amplifier, the gain of the second differential amplifier is regulated, when in non-harmonic frequency, positive or negative high voltage is output, the positive or negative high voltage is reversely added to the cathode of a variable capacitance diode DC1 through a resistor R25 and an electrolytic capacitor C11, and the tuning frequency of the tuning network is regulated, so that the frequency of the tuning network is regulated to be in harmonic with the frequency of the vibration signals.
In a second embodiment, on the basis of the first embodiment, the adjustable notch filter is configured to control the notch filtering of the vibration frequency signal by using a resistor R1, a resistor R2, a capacitor C1-capacitor C3, and a differential amplifier formed by an operational amplifier AR1 to receive a pressure signal of a movable arm hydraulic cylinder of a loader detected by a pressure sensor and to receive a thermal resistor to detect an oil pressure temperature signal, then the oil pressure signal enters into operational amplifiers AR3 and AR4 via a capacitor C4, a resistor R5-resistor R11, a capacitor C5 and C6, and a field effect transistor T1 and T2, the pressure signal is allowed to pass through an adjustable notch filter formed by the notch filter, wherein the frequency of the notch filter is controlled by a gate voltage applied to the field effect transistor T1 and T2, and is finally output after limiting by a bipolar transistor formed by a diode D1 and D2, the differential amplifier comprises a resistor R1 and a resistor R2, one end of the resistor R1 and one end of the resistor R2 are respectively connected with an output signal positive electrode and a negative electrode of the oil pressure sensor, the other end of the resistor R1 is respectively connected with one end of the capacitor C1, one end of the capacitor C2 is connected with one end of the capacitor C2, one end of the capacitor C2 is connected with the other end of the capacitor C2, one end of the capacitor C2 is connected with the other end of the capacitor C2, one end of the resistor C2 is connected with the other end of the resistor R3 is connected with the resistor R3, one end is connected with the other end of the resistor is connected with the resistor R3, one end is connected with the resistor is 8, one end is connected with the other end is 3, and the other end is connected with the other end is 3, the output end of the operational amplifier AR3 is respectively connected with the other end of the resistor R10, one end of the resistor R11 and one end of the capacitor C6, the other end of the resistor R11 is connected with the drain electrode of the field effect tube T2, the other end of the capacitor C6 is respectively connected with the source electrode of the field effect tube T1, the source electrode of the field effect tube T2, the cathode of the diode D1 and the anode of the diode D2, the cathode of the diode D2 is connected with the power supply +5V, and the anode of the diode D1 is connected with the ground.
In a third embodiment, based on the first embodiment, the signal compensation circuit receives the signal after clipping by the dual diodes, and enters the multiplier to be multiplied by the working frequency waveform (which may be a response frequency waveform or a natural frequency waveform, and may be generated by vibration of an oscillator) of the pressure sensor generated by the waveform generator, which is not described in detail in the prior art, so as to extract the working frequency signal of the pressure sensor from the noise signal, then the voltage signal is subjected to temperature drift compensation and gain compensation by a second differential amplifier composed of a resistor R12-resistor R14 and an operational amplifier AR5, and finally enters the CPU central controller after being isolated by a photo coupler U1, thereby solving the problem that the weight of the obtained material is not accurate enough, specifically, the temperature drift compensation converts the temperature of the hydraulic cylinder of the detected loader into a resistance value by using a thermistor RT1 according to the relation between the piezoresistive coefficient of the pressure sensor and the temperature equidirectional change, and the voltage signal is applied to the multiplier by an amplifier AR6, a resistor R16-resistor R18, an amplifier of the resistor R19 is converted into a proportional voltage, the voltage signal is applied to the operational amplifier AR5 through an inverting amplifier R1, and then the voltage signal is applied to the multiplier 2 after being applied to the voltage amplifier 2, the voltage signal is amplified by the inverting amplifier 2, the voltage is applied to the multiplier 2, the voltage is applied to the voltage amplifier 2 is applied to the multiplier 2, and the amplitude of the voltage signal is reduced by the voltage amplifier 2 is increased by the pin 2, and the voltage amplifier 2 is increased by the voltage amplifier 2, and the voltage amplifier 2 is reduced by the voltage amplifier 2, the amplitude is increased by the voltage multiplier is reduced by the voltage 2, and the voltage amplifier 2 is reduced by the voltage multiplier is increased by the voltage 2, and the amplitude is reduced, and the amplitude of the voltage is reduced, and the amplitude of the voltage is reduced by the voltage is reduced, and the amplitude is compared to the amplitude is reduced, and is compared to the amplitude is compared to the voltage, the other end of the resistor R12 is respectively connected with the source electrode of the field effect transistor T3, one end of the resistor R13 and the in-phase input end of the operational amplifier AR5, the opposite-phase input end of the operational amplifier AR5 is respectively connected with the emitter electrode of the triode Q1, one end of the grounding resistor R14 and one end of the grounding resistor R29, the in-phase input end of the operational amplifier AR5 is respectively connected with the ground through the resistor R14, the output end of the operational amplifier AR5 is respectively connected with the other end of the resistor R13, the positive electrode of the grounding electrolytic capacitor C8 and one end of the inductor L1, the other end of the inductor L1 is connected with the pin 2 of the photoelectric coupler U1, the pin 1 of the photoelectric coupler U1 is connected with the power supply +5V through the resistor R15, the pin 3 of the photoelectric coupler U1 is connected with the CPU central controller, the opposite-phase input end of the operational amplifier AR6 is connected with the ground through the resistor R18, the input end of the operational amplifier AR6 is respectively connected with one end of the resistor R20 and one end of the resistor R16, the other end of the resistor R20 is respectively connected with the other end of the resistor R20, the other end of the resistor R20 is respectively connected with the other end of the resistor R16, the other end of the resistor R16 is respectively connected with the other end of the resistor R21 and one end of the resistor R23, the other end of the resistor R1 is respectively connected with the other end of the resistor R1 is connected with the resistor R24, the other end of the resistor R1 is connected with the other end of the resistor R1 and one end of the resistor R1 is connected with the resistor R1, the other end of the resistor is connected with the resistor R1 and one end of the resistor is connected with the other end of the resistor is connected with the resistor and one end of the resistor and one end is connected with the other end and the resistor and 3 is connected with the other end and 3 is respectively and 3 and is connected with the 3 and is respectively and is connected.
In the fourth embodiment, based on the first embodiment, the vibration frequency amplitude detection circuit detects the vibration signal of the loader by using a vibration sensor, tunes the vibration frequency detected by the vibration sensor by using a tuning network with variable frequency composed of an inductance L2, a capacitor C9 and a varactor DC1 connected in series, outputs a low voltage (zero or close to zero) when tuning the vibration frequency detected by the vibration sensor, the triode Q3 is turned on, the triode Q2 is turned on, one path of the vibration signal of the harmonic frequency enters a frequency voltage converter composed of a resistor R26, a resistor R27, a capacitor C12-capacitor C15, a voltage stabilizing tube Z1, a chip U1 with a model LTC1013 and an operational amplifier AR7 to be converted into a voltage proportional to the input frequency, the voltage is added to the gates of the field effect transistors T1 and T2, the notch filter frequency of the tunable notch filter is adjusted, the other path of the vibration signal is obtained by using an amplitude detection circuit composed of the operational amplifier AR8, the diode D4 and the capacitor C16, the method comprises adding to the grid of a field effect transistor T3 in a second differential amplifier, regulating the gain of the second differential amplifier, when not in harmonic frequency, outputting positive or negative high voltage, adding to the negative pole of a varactor DC1 via a resistor R25 and an electrolytic capacitor C11 reversely, regulating tuning frequency of a tuning network to harmonic frequency of vibration signal, including a capacitor C17, connecting one end of the capacitor C17 with vibration sensor output signal, connecting the other end of the capacitor C17 with one end of an inductor L2, one end of a capacitor C9, the positive pole of a diode D3, connecting the other end of the capacitor C9 with the negative pole of the varactor DC1, connecting the other end of the inductor L2 with the positive pole of the varactor DC1 to ground, connecting the negative pole of the diode D3 with one end of a grounding capacitor C10, the base of a triode Q4, the negative pole of a voltage stabilizing tube Z2, connecting the positive pole of the voltage stabilizing tube Z2 with one end of a resistor R25, the other end of the resistor R25 is respectively connected with the cathode of the grounding electrolytic capacitor C11 and the cathode of the varactor DC1, the emitter of the triode Q3 is connected with the power supply +0.3V, the collector of the triode Q3 is connected with the base of the triode Q2, the collector of the triode Q2 is connected with the other end of the capacitor C17, the emitter of the triode Q2 is respectively connected with one end of the capacitor C12 and the in-phase input end of the operational amplifier AR8, the other end of the capacitor C12 is connected with the pin 16 of the chip U3, the pin 12 of the chip U3 is connected with one end of the grounding capacitor C13, the pin 13 of the chip U3 is respectively connected with one end of the resistor R26, the positive electrode of the voltage regulator Z1 and one end of the capacitor C14, the other end of the resistor R26 is connected with +5V, the cathode of the voltage regulator Z1 and the other end of the capacitor C14 are connected with the ground, the pin 14 of the chip U3 is respectively connected with one end of the resistor R27 and one end of the capacitor C15 and the inverting input end of the operational amplifier AR7, the in-phase input end of the operational amplifier AR7 is connected with the ground, the output end of the operational amplifier AR7 is respectively connected with the other end of the resistor R27, the other end of the capacitor C15, the gate of the transistor C1, the gate of the transistor T1 and the output end of the output diode 4 is connected with the gate 4 of the diode 4 is connected with the gate 4, and the output diode 4 is connected with the output end of the output diode of the output electrode of the output diode.
When the invention is particularly used, the adjustable notch filter circuit adopts the first differential amplifier to receive the pressure signal of the movable arm hydraulic cylinder of the loader detected by the pressure sensor and receives the oil pressure temperature signal detected by the thermistor, then the notch filter is carried out on the vibration frequency signal by the adjustable notch filter, the pressure signal is allowed to pass, wherein the frequency of the notch filter is controlled by the grid voltage added to the field effect transistors T1 and T2, finally the frequency is limited by the double diodes consisting of the diodes D1 and D2 and then is output to the multiplier in the signal compensation circuit, the multiplier is multiplied by the working frequency waveform of the pressure sensor generated by the waveform generator to extract the working frequency signal of the pressure sensor from the noise signal, then the temperature drift compensation and the gain compensation are carried out by the second differential amplifier, finally the temperature drift compensation and the vibration noise influence are solved by the CPU central controller after the isolation of the photoelectric coupler U1, the problem of inaccurate weight of materials is caused, wherein the control of the frequency and gain compensation of notch filtering is controlled by the output of a vibration frequency amplitude detection circuit, a vibration sensor is specifically adopted to detect a vibration signal when the loader works, the vibration frequency detected by the vibration sensor is tuned by a tuning network with variable frequency, a diode D3 outputs low voltage during harmonic frequency, a triode Q3 is conducted, a triode Q2 is conducted, one path of the vibration signal of harmonic frequency enters a frequency-voltage converter to be converted into voltage in proportion to the input frequency, the voltage is added to the grids of field effect transistors T1 and T2, the frequency of notch filtering of the adjustable notch filter is regulated, the other path of the vibration signal is obtained through an amplitude detection circuit, the peak value of the vibration signal is added to the grid of the field effect transistor T3 in a second differential amplifier, the gain of the second differential amplifier is regulated, and positive or negative high voltage is output during non-harmonic frequency, the tuning frequency of the tuning network is adjusted to be harmonic with the frequency of the vibration signal by reversely adding the resistor R25 and the electrolytic capacitor C11 to the cathode of the varactor diode DC 1.
Claims (4)
1. The dynamic weighing device for the loader comprises an adjustable notch filter circuit, a signal compensation circuit and a vibration frequency amplitude detection circuit, and is characterized in that the adjustable notch filter circuit adopts a first differential amplifier to receive a movable arm hydraulic cylinder pressure signal of the loader, which is detected by a pressure sensor, and a thermistor to detect oil pressure temperature, then the movable arm hydraulic cylinder pressure signal and the thermistor enter the adjustable notch filter to carry out notch filtering on a vibration frequency signal, and the pressure signal is allowed to pass through and finally is output after being limited by a double diode;
the signal compensation circuit receives the signal after the amplitude limiting of the double diodes, and the signal enters a multiplier to be multiplied by the working frequency waveform of the pressure sensor generated by the waveform generator, the working frequency signal of the pressure sensor is extracted, then the temperature drift compensation and the gain compensation are carried out through a second differential amplifier, and finally the signal enters a Central Processing Unit (CPU) after being isolated;
the vibration frequency amplitude detection circuit adopts a vibration sensor to detect vibration signals when the loader works, after the vibration signals are subjected to tunable frequency, one path of the vibration signals is converted into voltage through a frequency-voltage converter, the voltage is added to an adjustable notch filter, the frequency of the notch filter is adjusted, the other path of the vibration signals is subjected to amplitude detection circuit to obtain vibration peak values, and the vibration peak values are added to a second differential amplifier, so that the gain of the second differential amplifier is adjusted.
2. The dynamic weighing device for a loader according to claim 1, wherein the adjustable notch filter circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 and one end of the resistor R2 are respectively connected with an anode and a cathode of an output signal of the oil pressure sensor, the other end of the resistor R1 is respectively connected with one end of a grounding capacitor C1, one end of the capacitor C2 and an in-phase input end of the operational amplifier AR1, the other end of the resistor R2 is respectively connected with one end of a grounding capacitor C3, the other end of the capacitor C2 and an inverting input end of the operational amplifier AR1, the output end of the operational amplifier AR1 is connected with one end of a capacitor C4, the other end of the capacitor C4 is respectively connected with an in-phase input end of a grounding resistor R6 and one end of a resistor R5, the inverting input end of the operational amplifier AR2 is respectively connected with one end of a grounding resistor R7 and one end of a resistor R8, the output end of the operational amplifier AR1 is respectively connected with the other end of the resistor C8 and one end of the capacitor C5, the other end of the resistor C5 is connected with one end of the resistor R9, the other end of the resistor R9 is respectively connected with one end of the ground capacitor C3, the other end of the drain effect transistor T1, the other end of the resistor C2 is connected with the drain effect R3, the other end of the resistor C2 is connected with the diode is connected with the other end of the resistor C3 and the diode is connected with the other end of the resistor 2, the positive end is connected with the resistor is connected with the positive end of the resistor 2, the resistor is connected with the resistor is 2.
3. The dynamic weighing device for a loader according to claim 2, wherein the signal compensation circuit comprises a multiplier U2 and an operational amplifier AR6, a pin 1 of the multiplier U2 is connected to a cathode of a diode D1, a pin 2 of the multiplier U2 is connected to a waveform generator, a pin 3 of the multiplier U2 is connected to one end of a resistor R12 and a drain of a field effect transistor T3, a source of the field effect transistor T3, one end of the resistor R13 and an in-phase input terminal of the operational amplifier AR5 are connected to a source of the resistor R28, an in-phase input terminal of the operational amplifier AR5 is connected to an emitter of a triode Q1, one end of a grounding resistor R14 and one end of a grounding resistor R29, an in-phase input terminal of the operational amplifier AR5 is connected to ground through a resistor R14, an output terminal of the operational amplifier AR5 is connected to the other end of the resistor R13 and the other end of the grounding resistor C8, one end of the inductor L1 is connected to a pin 2 of a photo coupler U1, a pin 1 is connected to a power supply +5v through a resistor R28, a pin 4 of the photo coupler U1 is connected to a pin 4 is connected to a resistor R10V 1, a collector of the other end of the resistor R16 is connected to an input terminal of the resistor R16, an output terminal of the resistor R16 is connected to an input terminal of the resistor R1, an input terminal of the resistor R16 is connected to an output terminal of the resistor R16, and one end of the resistor is connected to the other end of the resistor R1 is connected to the resistor R16, and one end of the resistor is connected to the other end of the resistor is connected to the resistor 3, the noninverting input end of the operational amplifier AR4 is connected with one end of a grounding resistor R22, the output end of the operational amplifier AR4 is respectively connected with the other end of a resistor R21 and one end of a resistor R24, and the other end of the resistor R24 is connected with the inverting input end of the operational amplifier AR 1.
4. The dynamic weighing apparatus for a loader according to any one of claims 2 and 3, wherein the vibration amplitude detection circuit comprises a capacitor C17, one end of the capacitor C17 is connected to the output signal of the vibration sensor, the other end of the capacitor C17 is connected to one end of an inductor L2, one end of a capacitor C9, the anode of a diode D3, the other end of the capacitor C9 is connected to the cathode of a varactor DC1, the other end of the inductor L2 and the anode of the varactor DC1 are connected to ground, the cathode of the diode D3 is connected to one end of a grounding capacitor C10, the base of a triode Q4, the cathode of a voltage regulator Z2, the anode of the voltage regulator Z2 is connected to one end of a resistor R25, the other end of the resistor R25 is connected to the cathode of the grounding capacitor C11, the cathode of the varactor DC1, the emitter of the triode Q3 is connected to a power source +0.3v, the collector of the triode Q3 is connected to the base of the triode Q2, the collector of the triode Q2 is connected with the other end of the capacitor C17, the emitter of the triode Q2 is respectively connected with one end of the capacitor C12 and the in-phase input end of the operational amplifier AR8, the other end of the capacitor C12 is connected with the pin 16 of the chip U3, the pin 12 of the chip U3 is connected with one end of the grounding capacitor C13, the pin 13 of the chip U3 is respectively connected with one end of the resistor R26, the positive electrode of the voltage stabilizing tube Z1 and one end of the capacitor C14, the other end of the resistor R26 is connected with the power supply +5V, the negative electrode of the voltage stabilizing tube Z1 and the other end of the capacitor C14 are connected with the ground, the pin 14 of the chip U3 is respectively connected with one end of the resistor R27, one end of the capacitor C15 and the opposite-phase input end of the operational amplifier AR7, the in-phase input end of the operational amplifier AR7 is connected with the ground, the output end of the operational amplifier AR7 is respectively connected with the other end of the resistor R27, the other end of the capacitor C15, the grid of the field effect tube T1 and the grid of the field effect tube T2, the opposite-phase input end of the operational amplifier AR8 is respectively connected with the negative electrode of the diode D4, one end of the grounding capacitor C16 and the grid electrode of the field effect transistor T3, and the output end of the operational amplifier AR8 is connected with the anode of the diode D4.
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| CN202111352701.8A CN114111984B (en) | 2021-11-16 | 2021-11-16 | Dynamic weighing device for loader |
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| CN114111984B true CN114111984B (en) | 2023-09-26 |
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