CN215114769U - Liquid flow standard device commutator verification system - Google Patents

Abstract

The utility model provides a liquid flow standard device commutator verification system, which comprises a sensor and a control device connected with the sensor, wherein the control system comprises an AC-DC power supply module, a high-precision timer, a singlechip, a TFT display screen, a relay, functional keys and the like, and the singlechip is connected with the AC-DC power supply module to provide power; the I/0 port of the singlechip is connected with the sensor and is used for detecting the switching time of the sensor signal; the timer is connected with the single chip microcomputer and used for acquiring signal switching time of the sensor, and the display screen is used for displaying time detected by the single chip microcomputer and switching of states of the functional keys; can acquire the switching-over time of commutator through sensor and singlechip, show time in real time through the display screen to whether can detect the symmetry of commutator and meet the requirements, calibrate the commutator, novel commutator, commutator in the use commutator, the commutator can realize convenient, swift examination after the accent is repaiied, reduces the complicated verification process of commutator, has improved flow standard device's work efficiency.

Description

Liquid flow standard device commutator verification system

Technical Field

The utility model relates to a liquid flow calibrating installation technical field, concretely relates to liquid flow calibrating installation commutator verification system.

Background

The liquid flow standard device is a quantity value transmission standard of the liquid flow of the closed pipeline, and can be used for researching test methods such as verification and calibration of various liquid (oil and water) standard device commutators. Classifying according to measuring instruments: the method can be divided into three types of a mass method (weighing method), a volumetric method and a standard meter method, a user can select a certain verification method according to the type, site limitation, economic conditions and the like of a test meter, and can also integrate the verification methods into a whole to build a corresponding standard device; in order to ensure the precision of the liquid flow standard device, the commutator equipment needs to be calibrated frequently, but the existing commutator calibrating method is not convenient and rapid enough, so that the working efficiency of the flow standard device is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the application provides a liquid flow standard device commutator calibration system to solve the technical problem that the commutator calibration in the prior art is not convenient and fast enough.

The utility model provides a liquid flow standard device commutator verification system, which comprises a sensor and a control device connected with the sensor, wherein the control device comprises an AC-DC power supply module, a high-precision timer, a singlechip and a TFT display screen, and the high-precision timer is connected with the AC-DC power supply module in a power supply way; the single chip microcomputer is connected with the sensor and used for detecting the switching time of the sensor signal; the high-precision timer is connected with the single chip microcomputer and used for acquiring the signal reversing time of the sensor, and the TFT display screen is used for displaying the time detected by the single chip microcomputer.

Specifically, when using, install the sensor on liquid flow standard device, trigger the sensor and just begin the timing when control commutator moves, and time stop timing when leaving the sensor, the sensor is with the signal transmission to the singlechip that detects, thereby the singlechip acquires the switching-over time of commutator to signal processing, show the time through the TFT display screen, thereby can detect whether the commutator switching time symmetry meets the requirements, proofread the commutator, novel commutator, the commutator in the use, the convenient, swift examination can be realized to the commutator after the adjustment, reduce the complicated verification process of commutator, the work efficiency of flow standard device has been improved.

Furthermore, the control device further comprises a relay, the input end of the relay is connected with the single chip microcomputer, the output end of the relay is provided with a butt joint, and the butt joint can be electrically connected with an electromagnetic valve of the commutator for the liquid flow standard device through the power supply interface.

Specifically, through setting up the relay, can be through the action of relay control switching-over solenoid valve when using, the switching-over time carries out accurate collection through the high accuracy timer, supplies connecting plug through the relay output to be connected with the solenoid valve of commutator to can control the solenoid valve of commutator through this system, can accomplish the examination work of commutator with this system when the commutator breaks down in the device, thereby make liquid flow standard device can normally work.

Furthermore, the power supply circuit of the AC-DC power supply module comprises an AC-DC power supply conversion module, a power plug connected with the input end of the AC-DC power supply conversion module, and a fuse arranged between the AC-DC power supply conversion modules; the AC-DC power conversion module comprises two groups of voltage output ends, wherein the voltage between two output terminals of one group of voltage output ends of the two groups of voltage output ends is DC5V, and the voltage between two output terminals of the other group of voltage output ends is DC 24V.

Furthermore, two capacitors are connected in parallel between two voltage output terminals of the two voltage output ends, and one of the capacitors is an electrolytic capacitor.

Further, the sensor comprises an NPN type proximity switch, a U type photoelectric switch and an EE-SV photoelectric sensor.

Furthermore, the type of the single chip microcomputer is STC12C5A60S 2.

Furthermore, the butt joint arranged at the output end of the relay is an aviation plug. The aviation plug can be conveniently and quickly disassembled and assembled, and is long in service life and strong in anti-interference capacity.

The utility model provides a pair of liquid flow standard device commutator verification system has following beneficial effect:

1. through setting up the sensor on liquid flow standard device, the push rod setting in the face of the commutator, can trigger the sensor when the push rod carries out the switching action at the promotion commutator and begin, and trigger the sensor once more when the push rod return, the signal transmission to singlechip that the sensor will detect, thereby the singlechip acquires the switching time that the push rod promoted the commutator to signal processing, show time through the display screen, thereby can detect whether the switching-over time of commutator is correct, proofread the commutator, novel commutator, the commutator in the use, the commutator can realize convenient, swift examination after the adjustment, reduce the complicated verification process of commutator, the work efficiency of flow standard device has been improved.

2. Through setting up the relay, can be regularly through the timer according to the switching-over time of switching-over valve when using, supply the connecting plug to be connected with the solenoid valve of commutator through the relay output to can control the solenoid valve of commutator through this system, thereby can control the solenoid valve through this system and work when the timing function trouble of commutator, thereby make liquid flow standard device can normally work.

3. The aviation plug can be conveniently and quickly disassembled and assembled in a mode of adopting the aviation plug, and is long in service life and strong in anti-interference capacity.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a liquid flow rate standard device.

Fig. 2 is the utility model provides a structural schematic diagram of a liquid flow calibrating installation commutator verification system.

Fig. 3 is the utility model provides a structural schematic diagram of controlling means in liquid flow calibrating installation commutator verification system.

Fig. 4 is a schematic diagram of a power supply circuit of a power supply module in a liquid flow calibrating device commutator calibrating system provided by the present invention.

Fig. 5 is a schematic diagram of a photosensor.

Fig. 6 is a schematic diagram of a proximity switch.

Fig. 7 is a schematic diagram of the reversing control of the relay in the commutator for the liquid flow standard device provided by the present invention.

Fig. 8 is a control schematic diagram of a key in a liquid flow calibration apparatus commutator calibration system provided by the utility model.

Fig. 9 is a control schematic diagram of an indicator lamp in the liquid flow calibrating apparatus commutator calibrating system provided by the utility model.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The utility model provides a liquid flow standard device commutator verification system refers to fig. 1-fig. 9, and this system includes sensor 1 and the controlling means 2 who is connected with the sensor, controlling means 2 includes AC-DC power module 21, high accuracy timer 22, singlechip 23 and TFT display screen 24, high accuracy timer 22 with AC-DC power module power supply is connected; the single chip microcomputer 23 is connected with the sensor 1 and used for detecting the switching time of the signal of the sensor 1; the high-precision timer 22 is connected with the single chip microcomputer 23 and used for acquiring signal switching time of the sensor, and the TFT display screen 24 is used for displaying time detected by the single chip microcomputer 23.

Specifically, referring to fig. 1, the structure diagram of the liquid flow standard device is shown, which includes a commutator 3, a workload device 32, a bottom valve 33, a bypass 34, and a push rod 31, wherein when in use, the sensor 1 is arranged close to the push rod, and the sensor can be arranged on the liquid flow standard device to face the push rod of the commutator, when the push rod pushes the commutator to perform a commutation action, the sensor 1 can be triggered, and when the push rod returns to the original position, the sensor transmits a detected signal to a single chip, the single chip processes the signal to obtain a switching time when the push rod pushes the commutator, the time is displayed through a TFT display screen, so as to detect whether the commutation time of the commutator is correct, and calibrate the commutator, the novel commutator, the commutator in use, and the commutator after adjustment and repair can be conveniently and quickly calibrated, the complicated verification process of the commutator is reduced, and the working efficiency of the flow standard device is improved.

The timer is a 16-bit high-precision time counter, timing is reliable and accurate, and the display screen 24 is a TFT color screen.

Further, the sensor 1 comprises an NPN type proximity switch, a U type photoelectric switch and an EE-SV3 photoelectric sensor.

When the sensors use a U-shaped photoelectric switch and an EE-SV3 photoelectric sensor, the sensors are arranged on two sides of the push rod, the sensing ends of the sensors are opposite to the push rod, the sensing ends of the sensors cannot be shielded by the push rod when the push rod is at a normal position, the sensing ends of the sensors are shielded when the commutator starts to act, signals are triggered and high-level signal states are output when the sensors are shielded, the timer is interrupted to be opened and starts a timing function when the system detects a level rising edge, the low-level signal state is triggered when the sensors are not shielded, the timer is interrupted to be closed when the level falling edge is detected, the timing and counting function is stopped, the acquired time is the period time between the rising edge and the falling edge, and the processing is to ensure the accuracy of the time.

Referring to fig. 5, which is a schematic diagram of an EE-SV3 photoelectric sensor, a device U9 is a photoelectric sensor, a photo transistor does not receive an optical signal when a sensor sensing portion is shielded, no voltage exists between "Uc" and "Ue" of the photo transistor, the transistor is in an open circuit state, an emitter potential is 0V since an emitter of the photo transistor is connected to a resistor to ground, Q10 is a PNP type transistor which operates in a switching state, the transistor has three operating regions, respectively, an off region, an amplifying region, and a saturation region, and operates in the off region and the saturation region in the present circuit, so that the Q10 transistor is turned on when a base voltage "Ub" is 0V, which corresponds to a switch closure, "Uc = Ue ≈ 0V", and a diode of a 521_2D photocoupler emits light, and a terminal voltage of the transistor "Ue" of the photocoupler at this time is 5V, thereby turning on the Q4 transistor, the Q4 transistor operates in a similar manner to the Q10 transistor, so that the P25 terminal voltage is approximately 0V when Q4 is on.

When the sensor is not shielded, the phototriode receives an optical signal, the 'Uc = Ue ≈ 5V' of the phototriode, the phototriode is in a short-circuit state, so that the emitter potential is 5V, the Q10 triode works in a cut-off region, a light emitting diode of the TLP521_2D phototriode cannot emit light, the emitter of the optocoupler receiving triode is grounded with a resistor, the 'Ue' terminal voltage of the optocoupler receiving triode is 0V, the Q4 triode is cut off, and the P25 terminal voltage is 5V. The conversion of high and low output levels is realized when the sensor is shielded or not shielded, and the time value can be accurately calculated by simultaneously acquiring the edge signal state during conversion by the CPU

Calculating the value of the resistance (R25):

calculating the value of R25 according to the ohm's law formula:

u = I R results in R = U/I

R25= (withstand voltage of 5V-EESV3 light emitting diode)/maximum current flowing through diode terminal = (5V-2.8V)/10 mA =0.22K

Analysis of switch state

The triode is not exactly the same in action as the mechanical contact switch, but it has some functional features that the mechanical switch does not. The base voltage of the NPN type triode can control the working region of the triode, when the input voltage is low level, no current flows through the collector due to no current in the base, no current flows through the collector and the load resistor, which is equivalent to the disconnection of the switch, and the triode works in the cut-off region at the moment. When the input voltage is at high level, the base electrode has current flowing through, so that the collector electrode has larger amplified current flowing through, therefore the load loop is conducted, and the transistor works in the saturation region at the moment, which is equivalent to the closing of the switch. The forward bias voltage of the base electrode and the emitting electrode of the triode is about 0.7V, and the input voltage must be lower than 0.7V to ensure that the base electrode current of the triode is zero when the triode works in a cut-off region. In order to accurately place the transistor in the cut-off region, the input voltage is often lower than 0.3V. Of course, the closer the input voltage is to zero, the more the transistor is in the cut-off region. To pass current through the load resistor, the collector and emitter of the transistor must be shorted, as in the closed state of the mechanical switch. In order to achieve the above purpose, the input voltage must reach a high level enough to enable the triode to work in a saturation working region, and under the condition that the triode is in a saturation state, the collector current is quite large, so that the whole power voltage is almost applied to a load resistor, and at the moment, the Uce voltage is close to 0V, so that the collector and the emitter of the triode are almost in a short-circuit state.

The setting principle of the proximity switch is the same as the design principle of the photoelectric switch, the switching process of the action of the push rod is detected through the proximity switch, then the signal is transmitted to the single chip microcomputer, refer to fig. 6, which is a schematic diagram of the proximity switch, when the proximity switch triggers the signal, the negative pole of the optical coupling light emitting diode is 0V, the light emitting diode works, when the triode of the photoelectric coupler receives the light signal, the port P24 is a low level signal, otherwise, when the sensor does not have the trigger signal, the light emitting diode does not work, the triode can not receive the light signal and is in a cut-off state, and the port P24 is a high level, thereby realizing the high-low level switching function of the circuit when the sensor triggers and does not trigger. The P24 port is connected with the external interrupt port of the CPU, thus realizing the system requirement of quick response.

Further, the control device 2 further comprises a relay 25, an input end of the relay is connected with the single chip microcomputer 23, an output end of the relay is provided with a butt joint 28, and the relay can be electrically connected with an electromagnetic valve of a commutator for a liquid flow standard device through the power supply interface.

Specifically, through setting up the relay, can be regularly through the timer according to the switching-over time of switching-over valve when using, supply the connecting plug through the relay output and be connected with the solenoid valve of commutator to can control the solenoid valve of commutator through this system, thereby can control the solenoid valve through this system and work when the timing function trouble of commutator, thereby make liquid flow standard device can normally work.

Referring to fig. 7, which is a working schematic diagram of a switching valve for controlling a commutator by controlling the relay to work by a single chip microcomputer, P26 and P27 are output interfaces controlled by the single chip microcomputer, when P26 is at a low level, a diode of a TLP521_2C photocoupler emits light, when a receiving triode receives a light signal, an emitter voltage is at a high level, so that a Q1 triode is turned on to control a relay coil to be energized and to act, when a P26 end is at a high level, the TLP521_2C photocoupler is not conducted, a Q1 triode is turned off, the relay coil is not energized, and therefore, the relay does not act. The control principle of the P27 port is the same as that of the P26 port.

Further, referring to fig. 4, as a circuit diagram of a power supply module, a power supply circuit of the power supply module 21 includes an AC-DC power conversion module, a power plug connected to an input terminal of the AC-DC power conversion module, and a fuse disposed between the AC-DC power conversion modules; the AC-DC power supply conversion module comprises two groups of voltage output ends, the voltage between two output terminals of one group of voltage output ends of the two groups of voltage output ends is 5V, the voltage between two output terminals of the other group of voltage output ends is 24V, two capacitors are arranged in parallel between the two voltage output terminals of the two groups of voltage output ends, and one capacitor is an electrolytic capacitor.

The P10 is a power line plug 27, FUSE is a system FUSE, when the system has over-current or over-voltage, the FUSE is opened first to protect other devices of the system, AC-DC is a power conversion module, the input is AC220V voltage and is converted into voltage which is output as DC24V and DC5V, and capacitors such as C8, C9, C10 and C11 play the role of output filtering in the circuit. The output of DC5V is directly connected to the power supply pin port of the single chip computer, and DC24V is used for supplying power to other peripheral components such as a sensor.

Further, a key 26 and an indicator light (not shown) are provided on the control device 2, various sensor types can be switched by the key, and states of switching in, switching out, key switching and the like are displayed by the display screen 24, and a control schematic diagram of the key and the indicator light is shown with reference to fig. 8 and 9; p32, P33, P34 and P35 are output ports of the singlechip, when a key is pressed down, a low level signal is provided to a port of the singlechip, and the level of the port is in a high level state at ordinary times.

When the P13, P14 and P15 ends of the single chip microcomputer output low level, the D3, D4 and D5 indicator lights are turned on, and otherwise, the indicator lights are turned off.

The R38, R39 and R40 are used as current-limiting resistors, because the D3, D4 and D5 light-emitting diodes are light-emitting components driven by current, the rated current is 10mA, if the current added to the light-emitting diodes is far greater than the rated current value under the condition of not adding the current-limiting resistors, the phenomenon can cause breakdown damage of the light-emitting diodes, the current-limiting resistors are added for sharing part of the current value, so that the current value added to the light-emitting diodes is controlled within 10mA to prevent damage, the withstand voltage value of the light-emitting diodes is 1V, and the total voltage is 5V, so that the calculated value of the resistors can be obtained: r = (5V-1V)/10mA =400 Ω.

Further, as a specific implementation manner, the model of the single chip microcomputer 23 is.

Further, the butt joint 28 arranged at the output end of the relay is an aviation plug. The aviation plug can be conveniently and quickly disassembled and assembled in a mode of adopting the aviation plug, and is long in service life and strong in anti-interference capacity.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (7)

1. The liquid flow standard device commutator verification system is characterized by comprising a sensor (1) and a control device (2) connected with the sensor, wherein the control device (2) comprises an AC-DC power supply module (21), a high-precision timer (22), a single chip microcomputer (23) and a TFT display screen (24), and the high-precision timer (22) is in power supply connection with the AC-DC power supply module; the single chip microcomputer (23) is connected with the sensor (1) and is used for detecting the switching time of signals of the sensor (1); the high-precision timer (22) is connected with the single chip microcomputer (23) and used for acquiring the signal switching time of the sensor, and the TFT display screen (24) is used for displaying the time detected by the single chip microcomputer (23).

2. The system for calibrating the commutator of the liquid flow standard device according to claim 1, wherein the control device (2) further comprises a relay (25), an input end of the relay is connected with the single chip microcomputer (23), an output end of the relay is provided with a butt joint, and the butt joint can be electrically connected with the electromagnetic valve of the commutator for the liquid flow standard device.

3. The system for calibrating a commutator of a liquid flow standard device according to claim 1, wherein the power supply circuit of the AC-DC power supply module (21) comprises an AC-DC power conversion module, a power plug connected with the input end of the AC-DC power conversion module, and a fuse arranged between the AC-DC power conversion module; the AC-DC power supply conversion module comprises two groups of voltage output ends, wherein the voltage between two output terminals of one group of voltage output ends of the two groups of voltage output ends is 5V, and the voltage between two output terminals of the other group of voltage output ends is 24V.

4. The system for calibrating a commutator of a liquid flow calibrating device according to claim 3, wherein two capacitors are connected in parallel between two voltage output terminals of the two voltage output terminals, and one of the capacitors is an electrolytic capacitor.

5. A liquid flow calibrating device commutator verification system according to claim 2, characterized in that the sensor (1) comprises an NPN-type proximity switch, a U-type photoelectric switch, an EE-SV3 photoelectric sensor.

6. The system for calibrating a diverter of a liquid flow standard device according to claim 1, wherein the single chip microcomputer (23) is of the type: STC12C5a60S 2.

7. The system for calibrating a diverter of a liquid flow calibration device according to claim 5, wherein the butt joint provided at the output of said relay is an aircraft plug.

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