Liquid level testing equipment suitable for shooting range filling

Abstract

The invention provides liquid level testing equipment suitable for shooting range filling. A signal conditioning module is used for conditioning and filtering voltage signals needing to be collected and transmitting the voltage signals subjected to conditioning and filtering to a signal collecting module; the signal acquisition module is used for acquiring a voltage signal and transmitting the acquired voltage signal to the DSP processing module; the DSP processing module is used for processing the voltage signal and transmitting the processed voltage signal to the network communication module and the serial port communication module; the network communication module is used for realizing a transmission communication function with an upper computer; the serial port communication module is used for realizing a serial port communication function with external equipment; and the network communication module and the serial port communication module are connected with the man-machine interaction panel. The rocket first-stage and second-stage filling liquid level height monitoring function can be completed, simultaneous power supply and data acquisition of different types of multiple capacitive low-temperature liquid level sensors are achieved, the data monitoring efficiency is improved, and the measurement precision is high.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level measurement, and in particular to a liquid level testing device suitable for range filling, and in particular to a liquid level testing device for range filling of a launch vehicle, which is suitable for monitoring and controlling the liquid level height when the launch vehicle is filled on the ground. Background Art

[0002] In many fields, real-time liquid level measurement can accurately reflect the current status information. For example, during the filling and flight of liquid rockets, the liquid level information of the propellant in the tank is a key parameter in the rocket control system. It directly participates in the adjustment of the control system and is one of the key factors that determine the success or failure of the launch. The new generation of launch vehicles widely use non-toxic and pollution-free liquid hydrogen, liquid oxygen, kerosene and other liquid propellants to replace conventional propellants that are highly toxic and dangerous. The liquid level measurement of cryogenic propellants requires high precision during filling, but the propellant level changes quickly, the temperature changes, and the liquid surface shakes.

[0003] At present, there are limited methods for measuring the liquid level of cryogenic propellants in liquid rockets in China. The main means for measuring specific liquid point positions of cryogenic fuels in the aerospace field at home and abroad is the annular capacitive liquid level sensor. The annular capacitive liquid level sensor uses different dielectric constants of different media as the measurement basis. The sensor sensitive capacitor is a multilayer annular capacitor composed of an inner ring and an outer ring. When liquid flows into or out of the multilayer annular capacitor, the dielectric constant changes, thereby causing a change in capacitance. After being converted into a voltage signal by a liquid level converter, the voltage signal is output to the back-end equipment.

[0004] However, there are many types of liquid level transducers involved in filling the tanks, and they need to collect and measure at the same time, and package the output voltage signals and transmit them to the back-end equipment, so that the liquid level information in each tank can be remotely and clearly obtained during filling. The liquid level signal emitted by a single capacitive liquid level sensor and processing circuit has low reliability. If any group of sensors or transducers fails, it will inevitably send out an erroneous liquid level signal. If the data of multiple sensors and transducers in the tank cannot be processed and compared in time, it may cause propellant filling errors and affect the rocket launch.

[0005] Therefore, during the ground propellant filling phase of the launch vehicle, the ground filling equipment is used to collect the liquid level signal in the tank, and the current liquid level height is calculated and transmitted to the measurement system in real time. This is crucial to controlling the amount of propellant in the tank and is of great significance in aviation, aerospace and related fields.

[0006] The patent document with the publication number CN109592082A discloses a device for detecting rocket power filling system signals. In order to solve the problem that there are many meter heads in the filling warehouse of the shooting range, the front and back end data of the filling system cannot be linked in real time, and the commonality between different models is not strong, the patent document provides a universal rocket power filling system signal acquisition device based on RS485, which can realize the purpose of concentrating the front-end warehouse meter heads in one combination and broadcasting and sharing the front and back end data in real time, and can be installed in the power filling system of different models of rockets. However, the patent document still has the defect of low reliability of the liquid level signal emitted by a single capacitive liquid level sensor and processing circuit. Summary of the invention

[0007] In view of the defects in the prior art, an object of the present invention is to provide a liquid level testing device suitable for filling a shooting range.

[0008] According to the present invention, a liquid level testing device suitable for filling a shooting range includes: a human-computer interaction panel and a filling liquid level detection unit; The filling level detection unit includes: a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module and a serial communication module; The signal conditioning module is used to condition and filter the voltage signal to be collected, and transmit the conditioned and filtered voltage signal to the signal collection module; The signal acquisition module is used to acquire the voltage signal and transmit the acquired voltage signal to the DSP processing module; The DSP processing module is used to process the voltage signal and transmit the processed voltage signal to the network communication module and the serial communication module; The network communication module is used to realize the transmission communication function with the host computer; the serial port communication module is used to realize the serial port communication function with the external device; The network communication module and the serial communication module are connected to the human-computer interaction panel; The signal acquisition module includes: a passive switch signal acquisition circuit and an analog voltage signal acquisition circuit; The passive switch signal acquisition circuit is used to acquire passive switch signals, and the analog voltage signal acquisition circuit is used to acquire analog voltage signals; The analog voltage signal acquisition circuit includes: a point-type intermediate voltage signal acquisition circuit, and a continuous triangle wave and linear wave acquisition circuit; The signals collected by the signal collection module include: passive switch signals and analog voltage signals; The signal conditioning module includes: a point-type intermediate voltage signal conditioning module circuit, and a continuous triangle wave and linear wave signal conditioning circuit; The output end of the point-type intermediate voltage signal conditioning module circuit is connected to the input end of the point-type intermediate voltage signal acquisition circuit; The output end of the continuous triangle wave and linear wave signal conditioning circuit is connected to the input end of the continuous triangle wave and linear wave acquisition circuit.

[0009] Preferably, the liquid level testing device further comprises: a power supply module; The power supply module is used to supply power to the signal conditioning module, the signal acquisition module, the DSP processing module, the network communication module and the serial communication module.

[0010] Preferably, a differential operational amplifier circuit is provided between the signal conditioning module and the signal acquisition module; The voltage signal output by the signal conditioning module is input to the signal acquisition module after being differentially processed by the differential operational amplifier circuit.

[0011] Preferably, the DSP processing module includes: a digital signal processor and a processor peripheral circuit; The digital signal processor and the peripheral circuits of the processor are used to realize the following functions: digital signal processing, power-on and power-off control, indicator light control, data collection packaging, remote control / local control switching; The model of the digital signal processor is TMS320F28335.

[0012] Preferably, the network communication module comprises: a network communication circuit 1 and a network communication circuit 2; The network communication circuit 1 is a master network port, and the network communication circuit 2 is a slave network port. When the master network port fails, it can be directly switched to the slave network port.

[0013] Preferably, the power supply module comprises: three independent AC / DC power supply modules; The three AC / DC power modules respectively supply power to the device itself and two groups of output interfaces. The output voltages of the two AC / DC power modules supplying power to the two groups of output interfaces can be adjusted, and the adjustment range of the output voltage is 27V~32V.

[0014] Preferably, the differential operational amplifier circuit comprises: an operational amplifier, a gain amplifier, a capacitor and a resistor; The model of the operational amplifier is OPA188AID, and the model of the gain amplifier is AD628AR.

[0015] Preferably, the point-type intermediate voltage signal acquisition circuit adopts 12V signal excitation, which is isolated by a photoelectric isolator and then input to the IO for acquisition; The point-type intermediate voltage signal acquisition circuit adopts a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix, and performs acquisition in steps; The continuous triangular wave and linear wave acquisition circuit adopts a precision 24-bit analog-to-digital converter with 20-bit effective resolution and a sampling accuracy of 0.001V; The model of the 16-bit 8-channel synchronous sampling chip is AD7606, the model of the COMS switch is DG408DY+, and the model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

[0016] Preferably, the network communication module adopts a W5300 module, which supports TCP protocol and UDP protocol; The network communication module adopts full-duplex working mode and can automatically correct the signal polarity; The network communication module has a 16KB memory inside for data sending / receiving buffer, which can meet the transmission rate adaptation, and the transmission rate can reach 100Mbps; The serial communication module includes: a serial communication chip and a digital isolation chip; The signal output by the DSP processing module is converted by the serial communication chip and then output by the digital isolation chip; The model of the serial communication chip is MAX490E, and the model of the digital isolation chip is ADuM1201ARZ.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts a differential circuit for pre-stage signal conditioning to realize accurate and undisturbed collection of various voltage signals. A multi-channel AD sampling chip plus a COMS switch are used to collect multi-channel voltage signals. When there are many types of converters involved in filling in the tank and simultaneous collection and measurement are required, it is ensured that multi-channel signals are collected simultaneously.

[0018] 2. The present invention adopts network transmission, which can remotely and clearly obtain the liquid level information in each tank in real time, can realize the power on and off of the liquid level converter in real time, and realize the debugging, analysis and display of various filling signals.

[0019] 3. The present invention simultaneously collects signals from point-type and continuous converters, and after transmission through a remote network, can realize the measurement of liquid level heights of multiple tanks and the full range, with a measurement error of less than ±2mm and high accuracy, and is suitable for filling various types of tank ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is a schematic diagram of the system framework of the liquid level testing equipment suitable for filling in a shooting range of the present invention; Figure 2 and Figure 3 is a circuit structure diagram of a signal conditioning circuit; Figure 4 It is a circuit structure schematic diagram of a passive contact signal acquisition circuit; Figure 5 It is a circuit structure schematic diagram of a point-type intermediate voltage signal acquisition circuit; Figure 6 It is a circuit structure diagram of a continuous triangle wave continuous wave sampling circuit; Figure 7 It is a circuit structure diagram of the DSP processing module; Figure 7.1 for Figure 7 A partial enlarged schematic diagram of the upper part of FIG. Figure 7.2 for Figure 7 A partial enlarged schematic diagram of the lower half of FIG. Figure 8 It is a schematic diagram of the circuit structure of the network communication module; Fig. 9 It is a circuit structure diagram of the serial communication module; Fig.10 Schematic diagram of the structure of the external shell of the liquid level test equipment Figure 1 ; Figure 10.1 for Fig.10 A partial enlarged schematic diagram of part A in FIG. Figure 10.2 for Fig.10 A partial enlarged schematic diagram of part B in FIG. Figure 10.3 for Fig.10 A partial enlarged schematic diagram of the C portion in FIG. Fig.11 Schematic diagram of the structure of the external shell of the liquid level test equipment Figure 2 ; Fig.12 Schematic diagram of the structure of the external shell of the liquid level test equipment Figure 3 ; Fig.13 Schematic diagram of the structure of the external shell of the liquid level test equipment Figure 4 . DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0022] Embodiment 1: like Figure 1-Figure 13 As shown, this embodiment provides a liquid level testing device suitable for filling a shooting range, including: a human-computer interaction panel and a filling liquid level detection unit; the filling liquid level detection unit includes: a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module and a serial communication module; the signal conditioning module is used to condition and filter the voltage signal to be collected, and transmit the conditioned and filtered voltage signal to the signal acquisition module; the signal acquisition module is used to collect the voltage signal and transmit the collected voltage signal to the DSP processing module; the DSP processing module is used to process the voltage signal and transmit the processed voltage signal to the network communication module and the serial communication module; the network communication module is used to realize the transmission communication function with the host computer; the serial communication module is used to realize the serial communication function with the external device; the network communication module and the serial communication module are connected to the human-computer interaction panel.

[0023] The liquid level testing equipment also includes: a power supply module; the power supply module is used to supply power to the signal conditioning module, the signal acquisition module, the DSP processing module, the network communication module and the serial communication module.

[0024] The power supply module includes: three independent AC / DC power modules; the three AC / DC power modules respectively supply power to the device itself and two groups of output interfaces, and the output voltage of the two AC / DC power modules supplying power to the two groups of output interfaces can be adjusted, and the adjustment range of the output voltage is 27V~32V.

[0025] A differential operational amplifier circuit is provided between the signal conditioning module and the signal acquisition module; the voltage signal output by the signal conditioning module is differentially processed by the differential operational amplifier circuit and then input to the signal acquisition module. The differential operational amplifier circuit includes: an operational amplifier, a gain amplifier, a capacitor and a resistor; the operational amplifier model is OPA188AID, and the gain amplifier model is AD628AR.

[0026] The signal conditioning module includes: a point-type intermediate voltage signal conditioning module circuit, and a continuous triangle wave and linear wave signal conditioning circuit.

[0027] Point-type intermediate voltage signal conditioning module circuit, such as Figure 2As shown, it includes: an operational amplifier, a resistor R199, a capacitor C356, a resistor R192, a resistor R195, a capacitor C351, a resistor R197, a resistor R198, a chip U75, a diode D67, a capacitor C559, a capacitor C562, a capacitor C563, a resistor R422, and a resistor R423. The model of the chip U75 is AD628ARZ-R7.

[0028] The VI_IN signal is outputted through one end of the resistor R423, and the other end of the resistor R423 is respectively connected to one end of the capacitor C562, one end of the capacitor C563, the cathode of the diode D67 and the +IN connection end of the chip U75. The anode of the diode D67 is grounded. The other end of the capacitor C563 is grounded.

[0029] One end of the resistor R422 is grounded, and the other end of the resistor R422 is respectively connected to one end of the capacitor C559, the other end of the capacitor C562 and the -IN connection terminal of the chip U75.

[0030] The FILT connection terminal of the chip U75 is connected to one end of the capacitor C351, and the other end of the capacitor C351 is grounded. The OUT connection terminal of the chip U75 is respectively connected to one end of the resistor R197 and one end of the resistor R195, and the other end of the resistor R197 is respectively connected to the RG connection terminal of the chip U75 and one end of the resistor R198, and the other end of the resistor R198 is grounded.

[0031] The other end of the resistor R195 is connected to one end of the resistor R192 and the non-inverting input end of the operational amplifier, and the inverting input end of the operational amplifier is connected to one end of the resistor R199 and one end of the capacitor C356. The other end of the resistor R199 is connected to the other end of the capacitor C356 and the output end of the operational amplifier, and the output end of the operational amplifier outputs the VI signal.

[0032] After the VI_IN signal passes through the filter circuit and the gain amplifier AD628AR, it is input to the operational amplifier OPA188AID, and then through the follower amplifier circuit, it finally outputs VI and is input to Figure 5 In the voltage acquisition circuit shown, Figure 5 The voltage acquisition circuit uses a 16-bit 8-channel synchronous sampling chip AD7606 and a CMOS switch to form a switching matrix DG408DY+ for step-by-step acquisition.

[0033] Continuous triangle wave and linear wave signal conditioning circuits, such as Figure 3As shown, it includes: an operational amplifier, a resistor R428, a capacitor C673, a resistor R432, a resistor R522, a capacitor C674, a resistor R523, a resistor R524, a resistor R525, a capacitor C668, a capacitor C669, a capacitor C670, a diode D118, a diode D120, a diode D119 and a diode D121.

[0034] The triangular wave signal VI_SJB is input through the non-inverting input terminal of the operational amplifier, the inverting input terminal of the operational amplifier is respectively connected to one end of the resistor R428 and one end of the capacitor C673, and the input terminal of the operational amplifier is respectively connected to the other end of the resistor R428, the other end of the capacitor C673, one end of the resistor R432 and one end of the resistor R522. The other end of the resistor R432 inputs the VI_SJB signal.

[0035] The other end of the resistor R522 is respectively connected to one end of the capacitor C674, one end of the resistor R524 and one end of the resistor R523.

[0036] The other end of the capacitor C674 inputs the VI_SJB signal and is respectively connected to the other end of the resistor R524 and one end of the resistor R525.

[0037] The other end of the resistor R523 is respectively connected to one end of the capacitor C668, one end of the capacitor C669, the anode of the diode D118 and the cathode of the diode D119. The other end of the capacitor C668 is grounded, the cathode of the diode D118 is connected to an external voltage, and the anode of the diode D119 is grounded.

[0038] The other end of the resistor R525 is respectively connected to the other end of the capacitor C669, one end of the capacitor C670, the cathode of the diode D120 and the anode of the diode D121. The other end of the capacitor C670 is grounded, the anode of the diode D120 is grounded, and the cathode of the diode D121 is connected to an external voltage.

[0039] The input triangle wave signal VI_SJB is conditioned by the differential operational amplifier circuit and then output VI_SJB_A to the acquisition circuit. Figure 6 As shown, a precision 24-bit analog-to-digital converter is used, with a 20-bit effective resolution and a sampling accuracy of 0.001V; the model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

[0040] The signal acquisition module includes: a passive switch signal acquisition circuit and an analog voltage signal acquisition circuit; the passive switch signal acquisition circuit is used to acquire the passive switch signal, and the analog voltage signal acquisition circuit is used to acquire the analog voltage signal.

[0041] Passive switch signal acquisition circuit, such as Figure 4As shown, it includes: chip U95, resistor R252, diode D77, capacitor C406, resistor R254, resistor R258, diode D79, capacitor C410, resistor R265, resistor R266, diode D80, capacitor C411, resistor R267, resistor R272, diode D82, capacitor C418 and resistor R275. The model of chip U95 is PS2801-4-A.

[0042] The D1+ connection terminal of chip U95 is respectively connected to one end of resistor R252 and the cathode of diode D77, the other end of resistor R252 is respectively connected to one end of capacitor C406 and one end of resistor R254, the anode of diode D77 is respectively connected to the D1- connection terminal of chip U95, the other end of capacitor C406 and the other end of resistor R254, and serves as the input terminal of IN_YJZ1 signal.

[0043] The D2+ connection end of chip U95 is respectively connected to one end of resistor R258 and the cathode of diode D79, the other end of resistor R258 is respectively connected to one end of capacitor C410 and one end of resistor R265, the anode of diode D79 is respectively connected to the D2- connection end of chip U95, the other end of capacitor C410 and the other end of resistor R265, and serves as the input end of IN_YJZ2 signal.

[0044] The D3+ connection terminal of chip U95 is respectively connected to one end of resistor R266 and the cathode of diode D80, the other end of resistor R266 is respectively connected to one end of capacitor C411 and one end of resistor R267, the anode of diode D80 is respectively connected to the D3- connection terminal of chip U95, the other end of capacitor C411 and the other end of resistor R267, and serves as the input terminal of IN_YJZ3 signal.

[0045] The D4+ connection terminal of chip U95 is respectively connected to one end of resistor R272 and the cathode of diode D82, the other end of resistor R272 is respectively connected to one end of capacitor C418 and one end of resistor R275, the anode of diode D82 is respectively connected to the D4- connection terminal of chip U95, the other end of capacitor C418 and the other end of resistor R275, and serves as the input terminal of IN_YJZ4 signal.

[0046] Passive switch signal acquisition circuit, such as Figure 4 As shown, the chip U103, a resistor R276, a resistor R278, a diode D84, a capacitor C422 and a resistor R282 are also included. The model of the chip U103 is PS2801-1.

[0047] The T+ connection terminal of the chip U103 is connected to one end of the resistor R276, and the T- connection terminal of the chip U103 is grounded.

[0048] The D+ connection end of chip U103 is respectively connected to one end of resistor R278 and the cathode of diode D84, and the D- connection end of chip U103 is respectively connected to the anode of diode D84, the other end of capacitor C422 and the other end of resistor R282, and serves as the input end of IN_YJZ5 signal.

[0049] IN_YJZ1~ IN_YJZ5 are point switch signals. After being excited by 12V signal, they are converted by isolation optocoupler PS2801 and input into DSP IO acquisition.

[0050] The signals collected by the signal acquisition module include: passive switch signals and analog voltage signals. The analog voltage signal acquisition circuit includes: point-type intermediate voltage signal acquisition circuit, and continuous triangle wave and linear wave acquisition circuit; the point-type intermediate voltage signal acquisition circuit uses 12V signal excitation, which is isolated by a photoelectric isolator and input to IO for acquisition; the point-type intermediate voltage signal acquisition circuit uses a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix for step-by-step acquisition; the continuous triangle wave and linear wave acquisition circuit uses a precision 24-bit analog-to-digital converter with 20-bit effective resolution and a sampling accuracy of 0.001V; the model of the 16-bit 8-channel synchronous sampling chip is AD7606, the model of the COMS switch is DG408DY+, and the model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

[0051] The DSP processing module includes: a digital signal processor and processor peripheral circuits; the digital signal processor and processor peripheral circuits are used to realize the following functions: digital signal processing, power-on and off control, indicator light control, collected data packaging, remote control / local control switching; the model of the digital signal processor is TMS320F28335.

[0052] The network communication module includes: network communication circuit 1 and network communication circuit 2; network communication circuit 1 is the main network port, and network communication circuit 2 is the slave network port. When the main network port fails, it can directly switch to the slave network port. The network communication module uses the W5300 module, which supports TCP protocol and UDP protocol; the network communication module adopts full-duplex working mode and can automatically correct the signal polarity; the network communication module has a 16KB memory inside for data sending / receiving cache, which can meet the transmission rate adaptation, and the transmission rate can reach 100Mbps; the serial communication module includes: a serial communication chip and a digital isolation chip; the signal output by the DSP processing module is converted by the serial communication chip and output through the digital isolation chip; the model of the serial communication chip is MAX490E, and the model of the digital isolation chip is ADuM1201ARZ.

[0053] The signal conditioning circuit, signal acquisition circuit and communication circuit of this embodiment are different from the existing circuits. The signal circuit of this embodiment adopts a differential circuit acquisition method to avoid excessive errors caused by signal interference and improve the acquisition accuracy. The acquisition accuracy of the equipment in this embodiment can reach 1mV.

[0054] In this embodiment, the communication module has two parts, one is a serial communication module, and the other is a network communication module. Both modules have dual backups. The network module and the serial communication module can perform hot backup during use. When a problem occurs in one path, the other path will automatically connect to maintain communication.

[0055] The equipment described in this embodiment can be used for refueling at the target range through remote control. The existing equipment requires operators to operate on-site. When the equipment in this embodiment is refueled at the target range, the operator can perform expedition control at a site hundreds of meters away from the launch site, and can realize equipment self-test, power switch control, signal acquisition and display and other operations to ensure personnel safety.

[0056] The liquid level testing device suitable for range filling also includes an external housing.

[0057] like Fig.10 As shown, the external shell is provided with a first-level R box point power-on interface, a first-level Y box point power-on interface, a first-level Y box continuous power-on interface, a second-level R box point power-on interface, and a second-level Y box point power-on interface.

[0058] like Fig.10 As shown, the external shell is also provided with a triangular wave interface, a linear wave interface, a primary R box point interface, a secondary R box point interface, a primary Y box point interface, a secondary Y box point interface, and a primary Y box continuous interface.

[0059] like Figure 10.2 As shown, a voltage regulating module is also provided on the external shell, and the voltage regulating module includes: a first-level R box point voltage interface, a first-level Y box point voltage interface, a first-level Y box continuous voltage interface, a second-level R box point voltage interface, and a second-level Y box point voltage interface.

[0060] like Figure 10.3 As shown, the external housing is also provided with local control and remote control knobs, a power switch, and a local control power interface.

[0061] A measurement interface module is also provided on the external shell, and the measurement interface module includes: a first-level R box point measurement interface, a first-level Y box point measurement interface, a first-level Y box continuous side face interface, a second-level R box point measurement interface, and a second-level Y box point measurement interface.

[0062] like Figure 10.1As shown, the external shell is also provided with indicator lights and analog switches of the first-level R box, the first-level Y box, the second-level R box and the second-level Y box. The first-level R box is provided with indicator lights Ⅰ to Ⅳ and analog switches, the first-level Y box is provided with indicator lights Ⅰ to Ⅴ and analog switches, the second-level R box is provided with indicator lights Ⅰ to Ⅳ and analog switches, and the second-level Y box is provided with indicator lights Ⅰ to Ⅴ and analog switches.

[0063] like Fig.12 As shown, the external housing is also provided with a continuous signal self-test connection terminal, which is marked with 0, I, II, III, IV, and 0. The external housing is also provided with a primary Y continuous interface marked with X1, a primary Y point interface marked with X2, a primary R point interface marked with X3, a secondary Y point interface marked with X4, a secondary R point interface marked with X5, an interface marked with X6, an interface marked with X7, an interface marked with X8, and an interface marked with X9.

[0064] like Fig.12 As shown, the external shell is also provided with a first-level Y continuous knob, a first-level Y point knob, a first-level R point knob, a second-level Y point knob, and a second-level R point knob.

[0065] like Fig.12 As shown, the external shell is also provided with a ground connection terminal, an AC / 220V connection terminal and a buzzer.

[0066] Embodiment 2: Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0067] This embodiment provides a liquid level testing device suitable for range filling, which can improve the convenience and accuracy of cryogenic propellant liquid level signal measurement, and is particularly suitable for simultaneous measurement of multiple tanks and multiple liquid level signals during range filling.

[0068] The present embodiment provides a liquid level testing device suitable for filling a shooting range, including a hardware circuit and a human-computer interaction panel, etc. The hardware circuit includes at least a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module and a serial communication module.

[0069] The power supply module is used to supply power to various parts of the device; it includes three independent AC / DC power supply modules, which respectively supply power to the device itself and two sets of output interfaces. The two power supply modules supplying power to the output interfaces are adjustable power supplies that can meet the output range of 27V~32V.

[0070] The signal conditioning module is used to condition and filter the voltage signal to be collected; the voltage signal is differentially processed by the differential operational amplifier circuit and then input to the signal collection module.

[0071] The analog voltage signal acquisition circuit includes: a point-type intermediate voltage signal acquisition circuit, and a continuous triangle wave and linear wave acquisition circuit; a point-type intermediate voltage conditioning module circuit, such as Figure 2 After the VI_IN signal passes through the filter circuit and the gain amplifier AD628AR, it is input to the operational amplifier OPA188AID, and then through the follower amplifier circuit, the final output VI is input to Figure 5 In the voltage acquisition circuit shown, Figure 5 The voltage acquisition circuit uses a 16-bit 8-channel synchronous sampling chip AD7606 and a CMOS switch to form a switching matrix DG408DY+ for step-by-step acquisition.

[0072] Continuous triangle wave and linear wave signal conditioning circuits such as Figure 3 As shown in the figure, the input triangle wave signal VI_SJB is conditioned by the differential operational amplifier circuit and then output VI_SJB_A to the acquisition circuit. Figure 6 As shown, a precision 24-bit analog-to-digital converter is used, with a 20-bit effective resolution and a sampling accuracy of 0.001V; the model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

[0073] The signal conditioning module is used to condition and filter the voltage signal to be collected; the voltage signal is differentially processed by the differential operational amplifier circuit and then input to the signal collection module.

[0074] The differential operational amplifier circuit of the continuous liquid level converter signal conditioning module adopts high-precision and low-power operational amplifier OPA188AID, variable gain amplifiers AD8421AR, AD628AR, precision capacitors, and precision resistors.

[0075] The positive and negative ends of the continuous liquid level converter signal pass through an RC filtering circuit composed of precision capacitors and resistors, and then pass through an amplification circuit composed of a variable gain amplifier AD8421AR. When the voltage difference between the in-phase input and the inverting input of the variable gain amplifier AD8421AR becomes larger, the voltages at both ends tend to be equal. When the voltage at the inverting input becomes higher, the output changes to a negative direction, and then passes through a high-precision operational amplifier OPA188AID for inversion and input into the signal acquisition module.

[0076] The point self-test signal and power supply voltage signal conditioning module is composed of an operational amplifier OPA188AID and a differential amplifier AD628. The point self-test signal and voltage signal pass through a clamping circuit composed of a resistor and a voltage regulator, and then pass through an amplification circuit composed of a variable gain amplifier AD628AR. When the voltage difference between the in-phase input terminal and the inverting input terminal of the variable gain amplifier AD628AR becomes larger, the voltages at both ends tend to be equal. When the voltage at the inverting input terminal becomes higher, the output changes to a negative direction, and then passes through a high-precision operational amplifier OPA188AID for reverse operation and input into the acquisition module.

[0077] The signal acquisition module is used to collect signals, and the collected signals include passive switch signals and analog voltage signals. The point-type passive signal acquisition circuit uses 12V signal excitation, which is isolated by a photoelectric isolator and then input to the IO for acquisition; the analog voltage signal is divided into point-type intermediate voltage signal acquisition and continuous triangular wave and linear wave voltage acquisition. The point-type intermediate voltage signal acquisition circuit uses a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix for step-by-step acquisition; the continuous triangular wave and linear wave acquisition circuit uses a precision 24-bit analog-to-digital converter with a 20-bit effective resolution, which can ensure that the sampling accuracy reaches 0.001V.

[0078] The point-type intermediate voltage signal acquisition circuit includes a 16-bit 8-channel synchronous sampling chip AD7606, a COMS switch DG408DY+, and a precise 24-bit analog-to-digital converter ADS1220IPWR in the continuous triangle wave and linear wave acquisition circuit.

[0079] The DSP processing module includes a digital signal processor and its peripheral circuits, which are used to complete functions such as digital signal processing, power-on and off control, indicator light control, data collection and packaging, remote control / local control switching, etc. The digital signal processor is TMS320F28335.

[0080] The network communication module is used for transmission communication functions with the upper computer software; it includes network communication circuit 1 and network communication circuit 2, network communication circuit 1 is the main network port, and network communication circuit 2 is the slave network port. When the main network port fails, it can directly switch to the slave network port.

[0081] The network communication circuit adopts W5300 module, supports TCP, UDP protocols; adopts full-duplex working mode, can automatically correct signal polarity; has 16KB internal memory for data sending / receiving cache, can meet the transmission rate adaptation, and the transmission rate can reach 100Mbps.

[0082] The serial port communication module is used for serial port communication with external devices; The serial communication module includes the serial communication chip MAX490E and the digital isolation chip ADuM1201ARZ. The signal output by the DSP is converted by the serial communication chip and then output by the digital isolation chip to ensure that the signals do not interfere with each other.

[0083] The human-machine interaction panel includes five power supply control switches, an output adjustable knob, seven digital displays, point signal indicators and analog switches, a remote control switching knob, an interface for connecting to the converter, a network communication interface, a serial communication interface, etc.

[0084] The present embodiment provides a liquid level testing device suitable for range filling, including a human-computer interaction panel and a filling level detection unit. Among them, the hardware circuit of the filling level monitoring unit includes at least a power supply module, a signal conditioning module, an AD acquisition module, a DSP processing module, a network communication module and a serial communication module. The range filling level testing equipment of the present embodiment can complete the function of monitoring the height of the first and second stage filling levels of rockets, realize simultaneous power supply and data collection for different types and multiple capacitive cryogenic liquid level sensors, improve data monitoring efficiency, and has high measurement accuracy. It can be remotely controlled, and at the same time meets the requirements of scalability, integration and portability of the test equipment.

[0085] Embodiment 3: Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0086] like Figure 1 As shown, this embodiment provides a liquid level testing device suitable for filling a shooting range, including a filling liquid level monitoring unit hardware circuit and a human-computer interaction panel, etc. The hardware circuit includes at least a power supply module, a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module and a serial port communication module.

[0087] The power supply module is used to power various parts of the device; it contains three independent AC / DC power supply modules, namely AC / DC1, AC / DC2, and AC / DC3. AC / DC1 powers the device itself, AC / DC2 and AC / DC3 respectively power two sets of output interfaces, and AC / DC2 and AC / DC3 are adjustable power supplies that can meet the output range of 27V~32V.

[0088] Figure 1As shown in the figure, the point self-test signal and power supply voltage signal conditioning module is composed of an operational amplifier OPA188AID and a differential amplifier AD628. The point self-test signal and voltage signal pass through a clamping circuit composed of a resistor and a voltage regulator, and then pass through an amplification circuit composed of a variable gain amplifier AD628AR. When the voltage difference between the in-phase input and the inverting input of the variable gain amplifier AD628AR becomes larger, the voltages at both ends will tend to be equal. When the voltage at the reverse input becomes higher, the output will change to a negative direction, and then pass through a high-precision operational amplifier OPA188AID for inversion and input into the acquisition module.

[0089] Figure 2 As shown, the positive and negative ends of the continuous liquid level converter signal pass through the RC filtering circuit composed of precision capacitors and resistors, and then pass through the amplification circuit composed of the variable gain amplifier AD8421AR. When the voltage difference between the in-phase input and the inverting input of the variable gain amplifier AD8421AR becomes larger, the voltages at both ends will tend to be equal. When the voltage at the reverse input becomes higher, the output will change to the negative direction, and then pass through the high-precision operational amplifier OPA188AID for inversion and input into the signal acquisition module.

[0090] The signal acquisition module of the filling level monitoring unit is used to collect signals, including passive switch signals and analog voltage signals. Point-type passive signal acquisition circuit, such as Figure 4 As shown, 12V signal excitation is used, which is isolated by a photoelectric isolator and then input to the IO for acquisition; the analog voltage signal is divided into point-type intermediate voltage signal acquisition and continuous triangle wave and linear wave voltage acquisition.

[0091] Among them, the point-type intermediate voltage signal acquisition circuit uses a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix, and performs acquisition in steps, such as Figure 5 As shown; continuous triangle wave and linear wave acquisition circuit, such as Figure 6 As shown, a precision 24-bit analog-to-digital converter with 20-bit effective resolution is used to ensure that the sampling accuracy reaches 0.001V. The point-type intermediate voltage signal acquisition circuit includes a 16-bit 8-channel synchronous sampling chip AD7606, a COMS switch is DG408DY+, and a precision 24-bit analog-to-digital converter ADS1220IPWR in the continuous triangle wave and linear wave acquisition circuit.

[0092] The core of the filling level monitoring unit is the DSP processing module. The digital signal processor uses TMS320F28335, with a main frequency of 150M and a 16-channel 12-bit analog-to-digital conversion module. The DSP processing module circuit, such as Figure 7As shown. The power supply voltages on the DSP processing module are 5V, 3.3V and 1.9V, and a dedicated chip TPS767D301PWP is used to power the DSP control module circuit. The main functions of the DSP processing module include signal acquisition, IO control, network communication, serial communication, CAN communication, data calculation and other functions.

[0093] The filling level monitoring unit also includes a network communication module for transmission and communication functions with the host computer software, such as Figure 8 As shown, it includes network communication circuit 1 and network communication circuit 2. Network communication circuit 1 is the main network port, and network communication circuit 2 is the slave network port. When the main network port fails, it can directly switch to the slave network port. The network communication circuit adopts W5300 module, supports TCP, UDP protocol; adopts full-duplex working mode, can automatically correct signal polarity; there is 16KB memory inside for data sending / receiving cache, which can meet the transmission rate adaptation, and the transmission rate can reach 100Mbps.

[0094] The filling level monitoring unit includes a serial communication module for serial communication with external devices, such as Fig. 9 As shown in the figure, the serial communication module includes the serial communication chip MAX490E and the digital isolation chip ADuM1201ARZ. The signal output by the DSP is converted by the serial communication chip and then output by the digital isolation chip to ensure that the signals do not interfere with each other.

[0095] like Fig.10 The human-machine interaction panel shown includes five power supply control switches, an output adjustable knob, seven digital displays, point signal indicators and analog switches, a remote control switching knob, an interface for connecting to the converter, a network communication interface, a serial communication interface, etc.

[0096] The present invention can complete the function of monitoring the height of the first and second stage filling liquid levels of a rocket, realize the simultaneous power supply and data collection of multiple capacitive low-temperature liquid level sensors of different types, improve the data monitoring efficiency, and have high measurement accuracy.

[0097] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A liquid level testing device suitable for filling a shooting range, characterized in that: include: Human-machine interaction panel and filling level detection unit; The filling level detection unit includes: a signal conditioning module, a signal acquisition module, a DSP processing module, a network communication module and a serial communication module; The signal conditioning module is used to condition and filter the voltage signal to be collected, and transmit the conditioned and filtered voltage signal to the signal collection module; The signal acquisition module is used to acquire the voltage signal and transmit the acquired voltage signal to the DSP processing module; The DSP processing module is used to process the voltage signal and transmit the processed voltage signal to the network communication module and the serial communication module; The network communication module is used to realize the transmission communication function with the host computer; the serial port communication module is used to realize the serial port communication function with the external device; The network communication module and the serial communication module are connected to the human-computer interaction panel; The signal acquisition module includes: a passive switch signal acquisition circuit and an analog voltage signal acquisition circuit; The passive switch signal acquisition circuit is used to acquire passive switch signals, and the analog voltage signal acquisition circuit is used to acquire analog voltage signals; The analog voltage signal acquisition circuit includes: a point-type intermediate voltage signal acquisition circuit, and a continuous triangle wave and linear wave acquisition circuit; The signals collected by the signal collection module include: passive switch signals and analog voltage signals; The signal conditioning module includes: a point-type intermediate voltage signal conditioning module circuit, and a continuous triangle wave and linear wave signal conditioning circuit; The output end of the point-type intermediate voltage signal conditioning module circuit is connected to the input end of the point-type intermediate voltage signal acquisition circuit; The output end of the continuous triangle wave and linear wave signal conditioning circuit is connected to the input end of the continuous triangle wave and linear wave acquisition circuit.

2. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The liquid level testing device also includes: a power supply module; The power supply module is used to supply power to the signal conditioning module, the signal acquisition module, the DSP processing module, the network communication module and the serial communication module.

3. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: A differential operational amplifier circuit is provided between the signal conditioning module and the signal acquisition module; The voltage signal output by the signal conditioning module is differentially processed by the differential operational amplifier circuit and then input to the signal acquisition module.

4. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The DSP processing module includes: a digital signal processor and a processor peripheral circuit; The digital signal processor and the peripheral circuits of the processor are used to realize the following functions: digital signal processing, power-on and power-off control, indicator light control, data collection packaging, remote control / local control switching; The model of the digital signal processor is TMS320F28335.

5. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The network communication module includes: network communication circuit 1 and network communication circuit 2; The network communication circuit 1 is a master network port, and the network communication circuit 2 is a slave network port. When the master network port fails, it can be directly switched to the slave network port.

6. The liquid level testing device suitable for filling a shooting range according to claim 2, characterized in that: The power supply module includes: three independent AC / DC power supply modules; The three AC / DC power modules respectively supply power to the device itself and two groups of output interfaces. The output voltages of the two AC / DC power modules supplying power to the two groups of output interfaces can be adjusted, and the adjustment range of the output voltage is 27V~32V.

7. The liquid level testing device suitable for filling a shooting range according to claim 3, characterized in that: The differential operational amplifier circuit comprises: an operational amplifier, a gain amplifier, a capacitor and a resistor; The model of the operational amplifier is OPA188AID, and the model of the gain amplifier is AD628AR.

8. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The point-type intermediate voltage signal acquisition circuit adopts 12V signal excitation, which is isolated by a photoelectric isolator and then input to the IO for acquisition; The point-type intermediate voltage signal acquisition circuit adopts a 16-bit 8-channel synchronous sampling chip and a COMS switch to form a switching matrix, and performs acquisition in steps; The continuous triangular wave and linear wave acquisition circuit adopts a precision 24-bit analog-to-digital converter with 20-bit effective resolution and a sampling accuracy of 0.001V; The model of the 16-bit 8-channel synchronous sampling chip is AD7606, the model of the COMS switch is DG408DY+, and the model of the precision 24-bit analog-to-digital converter is ADS1220IPWR.

9. The liquid level testing device suitable for filling a shooting range according to claim 1, characterized in that: The network communication module adopts W5300 module, which supports TCP protocol and UDP protocol; The network communication module adopts full-duplex working mode and can automatically correct the signal polarity; The network communication module has a 16KB memory inside for data sending / receiving buffer, which can meet the transmission rate adaptation, and the transmission rate can reach 100Mbps; The serial communication module includes: a serial communication chip and a digital isolation chip; The signal output by the DSP processing module is converted by the serial communication chip and then output by the digital isolation chip; The model of the serial communication chip is MAX490E, and the model of the digital isolation chip is ADuM1201ARZ.

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