CN107783561A - Level sensor bolt initial position automatic adjustment system - Google Patents
Level sensor bolt initial position automatic adjustment system Download PDFInfo
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- CN107783561A CN107783561A CN201710846835.2A CN201710846835A CN107783561A CN 107783561 A CN107783561 A CN 107783561A CN 201710846835 A CN201710846835 A CN 201710846835A CN 107783561 A CN107783561 A CN 107783561A
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- level sensor
- gas
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Thermal Sciences (AREA)
- Measuring Volume Flow (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses level sensor bolt initial position automatic adjustment system, including source of the gas, filter, oil mist separator, precise pressure-reducing valve, gas pressure regulator, USB to turn 232 interfaces, host computer, sealed gas chamber, USB and turn 485 interfaces one, level sensor, change-over circuit plate, frequency meter, USB turn 485 interfaces two, controllor for step-by-step motor, subdivision driver and stepper motor.The present invention can obviously reduce labor intensity when water level sensor of washing machine bolt initial position determines, adjusted while realizing multiple level sensor bolt initial positions, significantly improve operating efficiency, practicality is good, shows that level sensor bolt initial position adjustment visual result understands on host computer.
Description
Technical field
The present invention relates to level sensor technical field of processing equipment, and in particular to a kind of water level sensor of washing machine bolt
Initial position automatic adjustment system.
Background technology
Level sensor has been obtained for widely using in current washing machine manufacturing field, is responsible for control washing machine
Water level.The accurate control of water level of washing machine plays an important role to washing machine in water saving, energy-conservation and in terms of reducing wash time.
At present in washing machine in wide variety of Resonator water level sensor principle by one reaction water level height can
Become inductance and two electric capacity compositions, form resonance circuit after additional phase inverter, the change of inductance causes the frequency of resonance circuit
Change, to represent the height of water level, and can by washing machine single-chip microcomputer read frequency value and control the dosage of water.
In water level sensor of washing machine production process, it is thus necessary to determine that the initial position of connection magnetic core spring bolt, generally
Way be the air chamber pressure control in level sensor to some setting value when, adjustment connection magnetic core spring bolt, make this
When CLC oscillating circuits frequency of oscillation be a certain fixed frequency.But because the bolt of adjustment connection magnetic core spring can change water level
The size of sensor internal air chamber, the atmospheric pressure value for causing above to have adjusted change, and need again to adjust atmospheric pressure value again
Whole to arrive setting value, change that is bringing therewith and being frequency, there is certain coupling pass between air pressure adjustment and frequency regulation
System, target could be realized after repeatedly debugging repeatedly by causing to generally require so that debugging is highly difficult, takes time and effort, completes
The people that the need of work has wide experience.
The content of the invention
The present invention solves current water level sensor of washing machine bolt initial position and determines difficult, the problems such as efficiency is low.Adopted
Technical scheme is：
Level sensor bolt initial position automatic adjustment system, including source of the gas, filter, oil mist separator, precision subtract
Pressure valve, gas pressure regulator, USB turn 232 interfaces, host computer, sealed gas chamber, USB and turn 485 interfaces one, level sensor, conversion electricity
Road plate, frequency meter, USB turn 485 interfaces two, controllor for step-by-step motor, subdivision driver and stepper motor；Host computer passes through USB
Turn 232 interfaces connection gas pressure regulator, and the actual gas in gas outlet of gas pressure regulator can be read according to the agreement of gas pressure regulator
Pressure value and the gas outlet atmospheric pressure value that gas pressure regulator is set；The compressed air that source of the gas provides is passed through at filter and oil mist separator
It is changed into air that is free from foreign meter, drying after reason, then the air inlet of gas pressure regulator, gas pressure regulator is connected by precise pressure-reducing valve
Gas outlet connection sealed gas chamber, be provided with multiple holes, the air pressure interface of level sensor and opening for sealed gas chamber on sealed gas chamber
Hole is connected, and the circuit interface of level sensor is connected with the input of change-over circuit plate；The frequency output terminal of change-over circuit plate connects
Connect the frequency input of frequency meter；Frequency meter and host computer carry out 485 networkings, and host computer turns 485 interfaces one connection frequency by USB
Rate table, host computer sequential read out the frequency values of frequency meter by the timing of MODBUS agreements；Controllor for step-by-step motor and host computer enter
The networking of row 485, host computer turn 485 interfaces two by USB and connect controllor for step-by-step motor；Controllor for step-by-step motor output connects respectively
Connect the direction signal and pulse signal of subdivision driver；The winding of the output connection stepper motor of subdivision driver；Host computer leads to
Crossing MODBUS agreements, stepper motor rotation direction signal and rotation step number are issued controllor for step-by-step motor, stepping electricity by timing successively
After machine controller receives direction signal and rotates step number, direction signal is exported to subdivision driver in the form of low and high level,
Step number will be rotated to export in the form of pulse number to subdivision driver, control of the subdivision driver in direction signal and pulse signal
Stepper motor processed rotates, and drives bolt to turn to relevant position.
Source of the gas is provided by air accumulator or air compressor machine.
The gas outlet atmospheric pressure value of precise pressure-reducing valve is arranged to the 2 of level sensor bolt initial position adjustment setting atmospheric pressure value
Times.
Level sensor bolt initial position automatic adjustment system, workflow specifically comprise the following steps：
Step 1：Start；
Step 2：The initial work of level sensor bolt initial position automatic adjustment system；
Step 3：Host computer turns 232 interfaces by USB and sets atmospheric pressure value to the gas outlet of gas pressure regulator, generally sets gas
Pressure value is 124mmH2O；
Step 4：Host computer turns 232 interfaces from the actual pressure value of gas pressure regulator reading gas outlet by USB；
Step 5：The setting atmospheric pressure value of gas pressure regulator gas outlet subtracts the actual pressure value of gas pressure regulator gas outlet, obtains
To barometric error eP (k), when barometric error eP (k) is more than threshold value ε 1,4 are gone to step, otherwise, goes to step 6；The threshold value
The spans of ε 1 are in 0.1mmH2O to 3mmH2Between O；
Step 6：Host computer is turned 485 interfaces 1 by USB and sequential read out using MODBUS agreements every time T in frequency meter
Frequency data, the expected frequency being defined under the kT moment air pressure are fr(k) frequency, read from frequency meter is fa(k), frequency
Error e f (k)=fr(k)-fa(k)；
Step 7：If the frequency error ef (k) of whole level sensors in allowed band ε 2, goes to step 11, otherwise,
Go to step 8；The spans of frequency error allowed band ε 2 are between ± 2Hz to ± 20Hz；
Step 8：If adjusting the maximum that number exceedes setting, 11 are gone to step, otherwise, goes to step 9；Complete once from step
Rapid 4 arrive the execution of step 10, i.e., the actual pressure value of gas outlet are read from gas pressure regulator, to controllor for step-by-step motor output side
Corresponding subdivision driver is given to rotation step number signal, is defined as adjustment once, the maximum root of the adjustment number setting
According to needs, span is between 2 to 100；
Step 9：Exceed the level sensor of allowed band to frequency error, using frequency error as input quantity, perform increment
Formula PI control algolithms, when output result is more than 0, direction signal is taken just, when output result is less than or equal to 0, to take direction signal
To be anti-, the absolute value of output result, which rounds up, to be changed into after integer and amplitude limit as rotation step number；The increment type PI controls are calculated
Method expression formula is Δ u (K)=KP[e(k)-e(k-1)]+KiE (k), KPSpan between 1 to 150, KiSpan
Between 0.01 to 10, between the amplitude limit value desirable 100 to 3200 of the increment type PI control algolithms output；
Step 10：Host computer turns 485 interfaces 2 using MODBUS agreements by the direction signal calculated and rotation by USB
Step number is sent to corresponding controllor for step-by-step motor, after controllor for step-by-step motor receives direction signal and rotates step number, by direction
Signal is exported in the form of low and high level to subdivision driver, will be rotated step number and is exported in the form of pulse number to Multi-level microstep
Device, adjustment number add 1, go to step 4；The stepper motor 200 pulses when not segmenting are turned around, the subdivision driver
High-subdividing number elects 32 as；
Step 11：Display adjustment result, if transferred from step 7, show that whole level sensors all adjust success,
If transferred from step 8, level sensor display of the frequency error in allowed band is adjusted successfully, display in addition
Adjustment failure；
Step 12：Terminate.
Beneficial effects of the present invention：The present invention can obviously reduce when water level sensor of washing machine bolt initial position determines
Labor intensity, adjusted while realizing multiple level sensor bolt initial positions, hence it is evident that improve operating efficiency, practicality
It is good, show that level sensor bolt initial position adjustment visual result understands on host computer, while the system can also detect water
Whether level sensor is qualified products, if by step 8, has exceeded certain adjustment number, has all been unable to reach requirement, can be with
It is considered substandard product.
Brief description of the drawings
Fig. 1 is level sensor bolt initial position automatic adjustment system composition frame chart of the present invention；
Fig. 2 is level sensor bolt initial position automatic adjustment system workflow diagram of the present invention.
Embodiment
Technical scheme described in detail below.The embodiment of the present invention is only for explanation concrete structure, the rule of the structure
Mould should not be limited by the examples.
Refering to Fig. 1, level sensor bolt initial position automatic adjustment system, including source of the gas 101, filter 102, mist of oil
Separator 103, precise pressure-reducing valve 104, USB turn 232 interfaces 105, gas pressure regulator 106, host computer 107, sealed gas chamber 108,
USB turns 485 interfaces 1, multiple level sensors 110, multiple change-over circuit plates 111, multiple frequency meters 112, USB and turns 485
Interface 2 113, multiple controllor for step-by-step motor 114, multiple subdivision drivers 115 and multiple stepper motors 116.
Source of the gas 101 is provided by air accumulator or air compressor machine, be changed into drying by filter 102 and oil mist separator 103 successively,
Air free from foreign meter；Air pressure is reduced after precise pressure-reducing valve 104, the outlet atmospheric pressure value of precise pressure-reducing valve 104 is arranged to water
2 times of level sensor bolt initial position adjustment setting atmospheric pressure value, the gas outlet connection gas pressure regulator of precise pressure-reducing valve 104
106 air inlet；Host computer 105 turns 232 interfaces 105 by USB and connects gas pressure regulator 106, and can be according to gas pressure regulator
Agreement read gas pressure regulator gas outlet actual pressure value and set gas pressure regulator gas outlet atmospheric pressure value；
The gas outlet of gas pressure regulator 106 connects sealed gas chamber 108, and multiple holes, level sensor are provided with sealed gas chamber 108
The perforate of air pressure interface and sealed gas chamber 108 on device 110 is connected, circuit interface and change-over circuit on level sensor 110
The input terminal of plate 111 is connected；The frequency input of the frequency output terminal rate of connections table 112 of change-over circuit plate 111；Frequency meter
112 and host computer 107 carry out 485 networkings, host computer 107 pass through USB turn the rate of connections tables 112 of 485 interface 1, host computer
107 sequential read out the frequency data of frequency meter 112 by the timing of MODBUS agreements；
Controllor for step-by-step motor 114 and host computer 107 carry out 485 networkings, and host computer 107 turns 485 interfaces two by USB
Each stepper motor is needed to rotate by 113 connection controllor for step-by-step motor 114, host computer 107 successively by the timing of MODBUS agreements
Direction and step number be sent to each controllor for step-by-step motor 114, the output end connection subdivision driver of controllor for step-by-step motor 114
115 input, controllor for step-by-step motor 114 export the direction signal received in the form of level, the rotation step number that will be received
Exported with pulse number, the winding of the output end connection stepper motor 116 of subdivision driver 115, subdivision driver 115 is in direction
The control stepper motor 116 of signal and pulse signal rotates, and drives level sensor bolt to turn to relevant position.
Referring to Fig. 2, level sensor bolt initial position automatic adjustment system workflow, specifically includes following step
Suddenly：
Step 1：Start；
Step 2：The initial work of level sensor bolt initial position automatic adjustment system；
Step 3：Host computer turns 232 interfaces by USB and sets atmospheric pressure value to the gas outlet of gas pressure regulator, generally sets gas
Pressure value is 124mmH2O；
Step 4：Host computer turns 232 interfaces from the actual pressure value of gas pressure regulator reading gas outlet by USB；
Step 5：The setting atmospheric pressure value of gas pressure regulator gas outlet subtracts the actual pressure value of gas pressure regulator gas outlet, obtains
To barometric error eP (k), when barometric error eP (k) is more than threshold value ε 1,4 are gone to step, otherwise, goes to step 6；The threshold value
The spans of ε 1 are in 0.1mmH2O to 3mmH2Between O；
Step 6：Host computer is turned 485 interfaces 1 by USB and sequential read out using MODBUS agreements every time T in frequency meter
Frequency data, the expected frequency being defined under the kT moment air pressure are fr(k) frequency, read from frequency meter is fa(k), frequency
Error e f (k)=fr(k)-fa(k)；
Step 7：If the frequency error ef (k) of whole level sensors in allowed band ε 2, goes to step 11, otherwise,
Go to step 8；The spans of frequency error allowed band ε 2 are between ± 2Hz to ± 20Hz；
Step 8：If adjusting the maximum that number exceedes setting, 11 are gone to step, otherwise, goes to step 9；Complete once from step
Rapid 4 arrive the execution of step 10, i.e., the actual pressure value of gas outlet are read from gas pressure regulator, to controllor for step-by-step motor output side
Corresponding subdivision driver is given to rotation step number signal, is defined as adjustment once, the maximum root of the adjustment number setting
According to needs, span is between 2 to 100；
Step 9：Exceed the level sensor of allowed band to frequency error, using frequency error as input quantity, perform increment
Formula PI control algolithms, when output result is more than 0, direction signal is taken just, when output result is less than or equal to 0, to take direction signal
To be anti-, the absolute value of output result, which rounds up, to be changed into after integer and amplitude limit as rotation step number；The increment type PI controls are calculated
Method expression formula is Δ u (K)=KP[e(k)-e(k-1)]+KiE (k), KPSpan between 1 to 150, KiSpan
Between 0.01 to 10；Between the amplitude limit value desirable 100 to 3200 of increment type PI control algolithms output；
Step 10：Host computer turns 485 interfaces two using MODBUS agreements by the direction signal calculated and rotation by USB
Step number is sent to corresponding controllor for step-by-step motor, after controllor for step-by-step motor receives direction signal and rotates step number, by direction
Signal is exported in the form of low and high level to subdivision driver, will be rotated step number and is exported in the form of pulse number to Multi-level microstep
Device, adjustment number add 1, go to step 4；Stepper motor 200 pulses when not segmenting are turned around, the high-subdividing number choosing of subdivision driver
For 32；
Step 11：Display adjustment result, if transferred from step 7, show that whole level sensors all adjust success,
If transferred from step 8, level sensor display of the frequency error in allowed band is adjusted successfully, display in addition
Adjustment failure；
Step 12：Terminate.
Claims (4)
1. level sensor bolt initial position automatic adjustment system, it is characterised in that including source of the gas, filter, mist of oil separation
Device, precise pressure-reducing valve, gas pressure regulator, USB turn 232 interfaces, host computer, sealed gas chamber, USB and turn 485 interfaces one, level sensor
Device, change-over circuit plate, frequency meter, USB turn 485 interfaces two, controllor for step-by-step motor, subdivision driver and stepper motor；It is described
Host computer turns 232 interfaces by the USB and connects the gas pressure regulator, and can read air pressure according to the agreement of gas pressure regulator
The gas outlet actual pressure value of controller and the gas outlet atmospheric pressure value that gas pressure regulator is set；The compressed air that the source of the gas provides
Pass through the filter and the oil mist separator successively, then entering for the gas pressure regulator is connected by the precise pressure-reducing valve
Gas port, the gas outlet of the gas pressure regulator connect the sealed gas chamber, multiple holes are provided with the sealed gas chamber；The water level
The air pressure interface of sensor is connected with the hole on the sealed gas chamber, the circuit interface of the level sensor and the conversion electricity
The input of road plate is connected；The frequency output terminal of the change-over circuit plate connects the frequency input of the frequency meter；The frequency
Rate table and the host computer carry out 485 networkings, and the host computer turns 485 interfaces one by the USB and connects the frequency meter, institute
State the frequency values that host computer sequential reads out the frequency meter by the timing of MODBUS agreements；The controllor for step-by-step motor and described
Host computer carries out 485 networkings, and the host computer turns 485 interfaces two by USB and connects the controllor for step-by-step motor；The stepping
Electric machine controller exports the direction signal and pulse signal for connecting the subdivision driver respectively；The output of the subdivision driver
Connect the winding of the stepper motor；The host computer is by MODBUS agreements successively regularly by the stepper motor rotation direction
Signal and rotation step number issue the controllor for step-by-step motor, and the controllor for step-by-step motor receives direction signal and rotates step number
Afterwards, direction signal is exported in the form of low and high level to the subdivision driver, step number will be rotated in the form of pulse number
Export to the subdivision driver, the subdivision driver controls stepper motor to turn in the presence of direction signal and pulse signal
It is dynamic, drive bolt to turn to relevant position.
2. level sensor bolt initial position automatic adjustment system according to claim 1, it is characterised in that the gas
Source is provided by air accumulator or air compressor machine.
3. level sensor bolt initial position automatic adjustment system according to claim 1, it is characterised in that described
The gas outlet atmospheric pressure value of precise pressure-reducing valve is arranged to 2 times of level sensor bolt initial position adjustment setting atmospheric pressure value.
4. level sensor bolt initial position automatic adjustment system according to claim 1, workflow specifically include
Following steps：
Step 1：Start；
Step 2：The initial work of level sensor bolt initial position automatic adjustment system；
Step 3：Host computer turns 232 interfaces by USB and sets atmospheric pressure value to the gas outlet of gas pressure regulator, generally sets atmospheric pressure value
For 124mmH2O；
Step 4：Host computer turns 232 interfaces from the actual pressure value of gas pressure regulator reading gas outlet by USB；
Step 5：The setting atmospheric pressure value of gas pressure regulator gas outlet subtracts the actual pressure value of gas pressure regulator gas outlet, obtains gas
Poor eP (k) is held up, when barometric error eP (k) is more than threshold value ε 1,4 is gone to step, otherwise, goes to step 6；The threshold value ε 1 takes
It is worth scope in 0.1mmH2O to 3mmH2Between O；
Step 6：Host computer turns 485 interfaces one by USB and sequential reads out frequency in frequency meter every time T using MODBUS agreements
Data, the expected frequency being defined under the kT moment air pressure are fr(k) frequency, read from frequency meter is fa(k), frequency error
Ef (k)=fr(k)-fa(k)；
Step 7：If the frequency error ef (k) of whole level sensors in allowed band ε 2, goes to step 11, otherwise, turn step
Rapid 8；The spans of frequency error allowed band ε 2 are between ± 2Hz to ± 20Hz；
Step 8：If adjusting the maximum that number exceedes setting, 11 are gone to step, otherwise, goes to step 9；Complete once from step 4
To the execution of step 10, i.e. the actual pressure value from gas pressure regulator reading gas outlet, to controllor for step-by-step motor outbound course
Corresponding subdivision driver to be given with step number signal is rotated, is defined as adjustment once, the maximum of adjustment number setting is as needed,
Span is between 2 to 100；
Step 9：Exceed the level sensor of allowed band to frequency error, using frequency error as input quantity, perform increment type PI
Control algolithm, when output result is more than 0, take direction signal as just, when output result is less than or equal to 0, take direction signal be it is anti-,
The absolute value of output result, which rounds up, to be changed into after integer and amplitude limit as rotation step number；The increment type PI control algolithms expression
Formula is Δ u (K)=KP[e(k)-e(k-1)]+KiE (k), KPSpan between 1 to 150, KiSpan 0.01
To between 10, between the amplitude limit value desirable 100 to 3200 of the increment type PI control algolithms output；
Step 10：Host computer by the direction signal calculated and rotates step number by USB turns of 485 interfaces 2 using MODBUS agreements
Corresponding controllor for step-by-step motor is sent to, after controllor for step-by-step motor receives direction signal and rotates step number, by direction signal
Exported in the form of low and high level to subdivision driver, step number will be rotated and exported in the form of pulse number to subdivision driver,
Adjustment number adds 1, goes to step 4；The stepper motor 200 pulses when not segmenting are turned around, the subdivision driver it is thin
Fraction elects 32 as；
Step 11：Display adjustment result, if transferred from step 7, show that whole level sensors all adjust success, if
Transfer, level sensor display of the frequency error in allowed band is adjusted successfully, display adjustment in addition from step 8
Failure；
Step 12：Terminate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710846835.2A CN107783561B (en) | 2017-09-19 | 2017-09-19 | Automatic adjusting system for initial position of water level sensor bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710846835.2A CN107783561B (en) | 2017-09-19 | 2017-09-19 | Automatic adjusting system for initial position of water level sensor bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107783561A true CN107783561A (en) | 2018-03-09 |
| CN107783561B CN107783561B (en) | 2020-07-28 |
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ID=61438007
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710846835.2A Active CN107783561B (en) | 2017-09-19 | 2017-09-19 | Automatic adjusting system for initial position of water level sensor bolt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093824A (en) * | 2021-04-06 | 2021-07-09 | 嘉兴学院 | High-precision air pressure controller applied to adjustment of initial position of water level sensor bolt |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093824A (en) * | 2021-04-06 | 2021-07-09 | 嘉兴学院 | High-precision air pressure controller applied to adjustment of initial position of water level sensor bolt |
| CN113093824B (en) * | 2021-04-06 | 2022-10-04 | 嘉兴南湖学院 | High-precision air pressure controller applied to adjustment of initial position of water level sensor bolt |
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| Publication number | Publication date |
|---|---|
| CN107783561B (en) | 2020-07-28 |
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