CN109521823A - A kind of temperature and humidity control system suitable for MMS-2A friction and wear tester - Google Patents
A kind of temperature and humidity control system suitable for MMS-2A friction and wear tester Download PDFInfo
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- CN109521823A CN109521823A CN201910010490.6A CN201910010490A CN109521823A CN 109521823 A CN109521823 A CN 109521823A CN 201910010490 A CN201910010490 A CN 201910010490A CN 109521823 A CN109521823 A CN 109521823A
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- 238000012360 testing method Methods 0.000 claims abstract description 25
- 239000003507 refrigerant Substances 0.000 claims description 18
- 238000009834 vaporization Methods 0.000 claims description 15
- 230000008016 vaporization Effects 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 13
- 230000003321 amplification Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000036632 reaction speed Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000002309 gasification Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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Abstract
The present invention provides a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine, including main casing and temperature and humidity control system, there is particular encapsulated chamber in the main casing, the temperature and humidity control system is connect with the airtight chamber, with the indoor temperature and humidity of control chamber, guarantee test has metastable temperature and humidity environment.The present invention guarantees that its temperature error is no more than 1 DEG C by acquiring the intracorporal temperature and humidity of shell in real time in temperature and humidity collection unit, and humidity error is no more than 0.6%, the going on smoothly of guarantee test, the accuracy of experimental data.Control system architecture is simple, and cost performance is high, and reaction speed is fast, and installation cost is low.Can be by the intracorporal temperature and humidity of display real-time display shell, the accurate variation for grasping temperature and humidity；It alarms in temperature and humidity beyond defined range, the friction and wear behavior of the material under different temperature and humidity is studied in more convenient follow-up test.
Description
Technical field
The present invention relates to MMS-2A friction wear testing machine technical fields, especially a kind of to be suitable for MMS-2A fretting wear
The temperature and humidity control system of testing machine.
Background technique
MMS-2A friction wear testing machine is usually used in the testing machine of research material rolling-sliding contact behavior in scientific research,
In operating platform can be to rolling between simulating wheel and rail, the transformation of power and revolving speed the case where under study it and rub
Abrasional behavior is wiped, corresponding curve is drawn out.
But the external condition of existing friction wear testing machine be it is complicated and changeable, the environment of surrounding be not it is constant not
Become, wherein temperature and humidity can change with the variation in season, when especially being influenced by local special climate, these factor meetings
The very big measurement result for influencing frictional wear experiment.
Currently, although the temperature and humidity control system of friction wear testing machine is able to solve Temperature and Humidity Control problem, but it is warm
The accuracy of humid control is lower, seriously affects the accuracy of experimental result.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of temperature and humidity control suitable for MMS-2A friction wear testing machine
System processed makes carrying out with relatively good for experiment by adjusting the temperature and humidity of the specific enclosure space of frictional wear experiment platform
Good temperature and humidity environment.
The technical solution of the present invention is as follows: a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine, packet
Include main casing and temperature and humidity control system, the chamber with particular encapsulated in the main casing, the Temperature and Humidity Control system
System is connect with the closed chamber, with the indoor temperature and humidity of control chamber, guarantees that experiment has metastable temperature and humidity environment.
Further, the main casing includes upper housing and lower case, and the upper housing connect to be formed with lower case
Airtight chamber, the experiment porch connection of the simulating wheel in the lower case and friction wear testing machine, the upper housing
Edge there is a boss, which connect with lower case and slide block device respectively.
Further, the temperature and humidity control system include temperature and humidity collection unit, A/D converter, single-chip microcontroller and
The airtight chamber of temperature and humidity control system, the main casing connect with temperature and humidity collection unit, the humiture collection list
Member is connect by A/D converter with single-chip microcontroller, and the single-chip microcontroller passes through the airtight chamber of temperature and humidity control system and main casing
Connection, the temperature and humidity control system includes temperature control unit, humidity controlling unit.
Further, the temperature and humidity collection unit includes temperature collection circuit and humidity collection circuit, the temperature
Acquisition Circuit is spent by I/U conversion circuit, impedance inverter circuit, voltage amplification and zero shift circuit composition, and the temperature of use passes
Sensor is the integrated temperature sensor of AD590 type, is had strong anti-interference ability, and is suitable for computer and carries out remote temperature
Degree measurement and control；
The humidity sensor of the humidity collection circuit be TDR-3 type soil moisture sensor, output voltage with
Relative humidity is in a linear relationship, and corresponding output voltage can represent corresponding humidity.
Further, the I/U conversion circuit is made of temperature sensor AD 590, the power supply of 12V, resistance R1, R2,
The power supply of one end of the temperature sensor AD 590 and 12V connect, the other end be in series with the resistance R1 that resistance value is 1k Ω and
The electric current flowed through on swept resistance R2, resistance R1, R2 will be directly proportional with dut temperature, and the both ends resistance R1, R2 will have at this time
The voltage signal of 1mV/K；
The impedance inverter circuit is made of linear amplifier A1 and linear amplifier A2, the temperature sensor
AD590 is also connect with the positive input of linear amplifier A1, and the direction input terminal and output end of the linear amplifier A1 is equal
It is connect with the reverse input end of linear amplifier A2, the positive input of the linear amplifier A2 is grounded through resistance R5, institute
State the output end and voltage amplification and zero shift circuit connection of linear amplifier A2；
The voltage amplification and zero shift circuit is the zeroing circuit being made of linear amplifier A3 and multiple resistance,
The reverse input end of the linear amplifier A3 is connect through resistance R10 with the output end of linear amplifier A2, and described is linear
The positive input of amplifier A3 is grounded through resistance R13, is gone here and there between the reverse input end and output end of the linear amplifier A3
It is associated with resistance R11 and swept resistance R12.
The humidity collection circuit includes humidity sensor TDR-3, comparator C4HC14, selector 74HC4352, line
Property amplifier A4, linear amplifier A5, linear amplifier A6, linear amplifier A7, zero potentiometer RW；
When relative humidity is 0~50%, it is low level, the A0 of selector 74HC4352 that comparator C4HC14, which exports VT,
The output signal U IN of=" 0 ", TDR-3 is exported from the end Y1, flows through linear amplifier A4, is sent out from selection end IN1.
When relative humidity is 50%~100%, it is high level that comparator C4HC14, which exports VT, selector 74HC4352's
A0=" 1 ", signal UIN are exported from the end Y2, by linear amplifier A5, linear amplifier A6, selection port IN2 output.
The closed of main casing is arranged in the soil moisture sensor of the integrated temperature sensor AD590 and TDR-3 type
For acquiring the intracorporal temperature and humidity of closed chamber in cavity, in order to truly acquire the environmental parameter in greenhouse, implement multiple spot number
According to acquisition, and carrying out processing system using the mean filter includes 4 tunnel temperature and 4 road moisture signals.
Further, the model ADC0809, the A/D converter ADC0809 of the A/D converter are that have 8
8 data converters of a data input channel, the quantity of the A/D converter ADC0809 are 2,2 A/D converters
For input terminal respectively with temperature collection circuit, humidity collection circuit connection, the output end of 2 A/D converters is defeated with single-chip microcontroller
Enter end connection.
Further, the temperature control unit includes heating unit and temperature reducing unit, the temperature control unit
Including expansion valve a, evaporator a, condenser a, compressor a, solenoid operated four-way valve a, the solenoid operated four-way valve a by pipeline with it is swollen
Swollen valve a connection, the expansion valve a are connect by pipeline with evaporator a, and the evaporator a passes through pipeline and compressor a
Connection, the compressor a are connect by pipeline with condenser a, and the condenser a is connect by pipeline with expansion valve a, institute
There is refrigerant, the expansion valve a is connect by pipeline with airtight chamber, and expansion valve a has and can reduce in the pipeline stated
The function of air pressure, therefore, when the indoor temperature of closed chamber is higher than predetermined temperature, system in the pipeline between expansion valve a and evaporator a
Cryogen further gasifies, and evaporator a makes the refrigerant evaporation after gasification to cooling down in the airtight chamber of main casing, and
The refrigerant in pipeline between evaporator a and compressor a is constantly in vaporized state and absorbs the indoor heat of closed chamber, makes
Its temperature reduces, and when refrigerant flows into compressor a, the both vapor compression after gasification is made its boiling point be higher than closed chamber by compressor a
Then indoor temperature to make its liquefaction, and makes its refrigerant liquefaction in the case where carrying out into expansion valve a by condenser a
Primary cooling.When needing to heat up in airtight chamber, changes current direction by opening solenoid operated four-way valve a, pass through electromagnetism four
Port valve a changes the flow direction of refrigerant in former temperature-fall period, realizes the heating movement of airtight chamber.
Further, the humidity controlling unit includes Dehumidifying element and humidification unit, and the Dehumidifying element includes
Expansion valve b, solenoid operated four-way valve b, evaporator b, reheater, compressor b, condenser b, the expansion valve b pass through pipeline and electricity
The b connection of magnetic four-way valve, the solenoid operated four-way valve b connects by pipeline with evaporator b, the evaporator b pass through pipeline and
Reheater connection, the reheater are connect by pipeline with compressor b, and the compressor b passes through pipeline and condenser b
Connection, the condenser b are connect with expansion valve b by pipeline, are placed with refrigerant in the pipeline, are existed by refrigerant
Evaporation endothermic in evaporator b reduces the indoor temperature of closed chamber, so that the indoor part Water vapor condensation of closed chamber exists
Evaporator surface makes the humidity relative reduction in air, so that the indoor air of closed chamber is become dry cold air, and by again
Hot device etc. it is wet heating so that relative humidity decline.
Further, the humidification unit includes water source storeroom, hothouse, vaporization chamber, jet pipe, the water source storage
Hiding room is used to store the vapor water source of humidification, and the water source storeroom is connected by bend pipe with vaporization chamber, the steaming
Hair interior is provided with baffle plate, and the vaporization chamber is connected to hothouse, and the hothouse is connect by pipeline with jet pipe, institute
Regulating valve is provided on the pipeline stated, vapour source enters vaporization chamber by bend pipe, can slow down the flowing of vapour source by bend pipe
Speed increases the movement of saturated vapor, when vapour source enters vaporization chamber by bend pipe, by baffle plate by the cold of the steam of saturation
Condensate is separated, and isolated steam enters hothouse, is entered in the airtight chamber of shell finally by jet pipe, realizes closed chamber
The humidification of room acts.
Further, the system further includes display, alarm, the display and alarm with
The output end of AT89C51 single-chip microcontroller connects, and judges to need to adjust by experiment temperature and humidity shown by display how many warm and humid
Degree, is written required temperature and humidity by keyboard input after feedback, is input to list by an other paths
In piece machine, display input terminal is connected with the output end of single-chip microcontroller at this time.When the experiment intracorporal temperature and humidity of shell is more than single-chip microcontroller institute
When the temperature humidity range pre-seted, alarm can be output to from single-chip microcontroller to trigger alarm, to people to prompt.
Further, the single-chip microcontroller uses AT89C51 single-chip microcontroller, and the 1-8 pin of the AT89C51 single-chip microcontroller is
It is connect with A/D converter；
The 39-32 pin of the AT89C51 single-chip microcontroller is connect with display；
The 20-22 pin of the AT89C51 single-chip microcontroller is connect with alarm；
The 23-25 pin of the AT89C51 single-chip microcontroller is connect with temperature control unit；
The 26-27 pin of the AT89C51 single-chip microcontroller is connect with humidity controlling unit.
The invention has the benefit that
1, the present invention is by acquiring the intracorporal temperature and humidity of shell in temperature and humidity collection unit in real time, protects its error no more than 1 DEG C,
Guarantee the accuracy of experimental data.
2, the present invention accurately controls the intracorporal temperature and humidity of shell by warm temperature and humidity control system, guarantees going on smoothly for experiment
And the accuracy of experimental data.
3, Control system architecture of the invention is simple, and cost performance is high, and reaction speed is fast, and installation cost is low.
4, the present invention can be by the intracorporal temperature and humidity of display real-time display shell, the accurate variation for grasping temperature and humidity；In temperature
For humidity beyond alarming in the range of regulation, more convenient subsequent experimental observes fretting wear under different temperature and humidity
Change degree.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
The structural schematic diagram of Fig. 2 AT89C51 system of the present invention；
Fig. 3 is the schematic diagram of temperature collection circuit of the present invention；
Fig. 4 is the schematic diagram of humidity collection circuit of the present invention；
Fig. 5 is the structural schematic diagram of temperature control unit of the present invention；
Fig. 6 is the structural schematic diagram of Dehumidifying element of the present invention；
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
As shown in Figure 1, a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine, including main casing with
Temperature and humidity control system, the main casing include upper housing and lower case, the upper housing connect with lower case to be formed it is close
Closed chamber room, the experiment porch connection of the simulating wheel in the lower case and friction wear testing machine, the upper housing
Edge has a boss, which connect with lower case and slide block device respectively.With particular encapsulated in the main casing
Chamber, the temperature and humidity control system are connect with the airtight chamber, with the indoor temperature and humidity of control chamber, guarantee that experiment has phase
To stable temperature and humidity environment.
The temperature and humidity control system includes temperature and humidity collection unit, A/D converter, single-chip microcontroller and temperature and humidity control
The airtight chamber of system processed, the main casing connect with temperature and humidity collection unit, and the temperature and humidity collection unit passes through A/D
Converter is connect with single-chip microcontroller, and the single-chip microcontroller is connected by the airtight chamber of temperature and humidity control system and main casing, described
Temperature and humidity control system include temperature control unit, humidity controlling unit.
The temperature and humidity collection unit includes temperature collection circuit and humidity collection circuit, the temperature collection circuit
By I/U conversion circuit, impedance inverter circuit, voltage amplification and zero shift circuit composition, as shown in figure 3, the I/U turns
Circuit is changed to be made of temperature sensor AD 590, the power supply of 12V, resistance R1, R2, one end of the temperature sensor AD 590 with
The power supply of 12V connects, and the other end is in series with the resistance R1 that resistance value is 1k Ω, the electric current flowed through on resistance R1 will with dut temperature at
Direct ratio, the both ends resistance R1 will have the voltage signal of 1mV/K at this time；AD590 is integrated temperature sensor, is had stronger anti-dry
Ability is disturbed, is suitable for computer and carries out remote temperature measurement and control,
The impedance inverter circuit is made of linear amplifier A1 and linear amplifier A2, the temperature sensor
AD590 is also connect with the positive input of linear amplifier A1, and the direction input terminal and output end of the linear amplifier A1 is equal
It is connect with the reverse input end of linear amplifier A2, the positive input of the linear amplifier A2 is grounded through resistance R5, institute
State the output end and voltage amplification and zero shift circuit connection of linear amplifier A2；
The voltage amplification and zero shift circuit is the zeroing circuit being made of linear amplifier A3 and multiple resistance,
The reverse input end of the linear amplifier A3 is connect through resistance R10 with the output end of linear amplifier A2, and described is linear
The positive input of amplifier A3 is grounded through resistance R13, is gone here and there between the reverse input end and output end of the linear amplifier A3
It is associated with resistance R11 and swept resistance R12.
As shown in figure 4, the humidity collection circuit includes humidity sensor TDR-3, comparator C4HC14, selector
74HC4352, linear amplifier A4, linear amplifier A5, linear amplifier A6, linear amplifier A7, zero potentiometer RW；
When relative humidity is 0~50%, it is low level, the A0 of selector 74HC4352 that comparator C4HC14, which exports VT,
The output signal U IN of=" 0 ", TDR-3 is exported from the end Y1, flows through linear amplifier A4, is sent out from selection end IN1.
When relative humidity is 50%~100%, it is high level that comparator C4HC14, which exports VT, selector 74HC4352's
A0=" 1 ", signal UIN are exported from the end Y2, by linear amplifier A5, linear amplifier A6, selection port IN2 output.TDR-3
For soil moisture sensor, output voltage is in a linear relationship with relative humidity, and corresponding output voltage can represent accordingly
Humidity.
The closed of main casing is arranged in the soil moisture sensor of the integrated temperature sensor AD590 and TDR-3 type
For acquiring the intracorporal temperature and humidity of closed chamber in cavity, in order to truly acquire the environmental parameter in greenhouse, implement multiple spot number
According to acquisition, and carrying out processing system using the mean filter includes 4 tunnel temperature and 4 road moisture signals.
The model ADC0809, the A/D converter ADC0809 of the A/D converter are that have 8 data inputs
8 data converters in channel, the quantity of the A/D converter ADC0809 are 2, the input terminal difference of 2 A/D converters
With temperature collection circuit, humidity collection circuit connection, the output end of 2 A/D converters is connect with the input terminal of single-chip microcontroller.
As shown in figure 5, the temperature control unit includes heating unit and temperature reducing unit, the temperature control unit
Including expansion valve a, evaporator a, condenser a, compressor a, solenoid operated four-way valve a, the solenoid operated four-way valve a by pipeline with it is swollen
Swollen valve a connection, the expansion valve a are connect by pipeline with evaporator a, and the evaporator a is connected by pipeline and compressor a
It connects, the compressor a is connect by pipeline with condenser a, and the condenser a is connect by pipeline with expansion valve a, institute
There is refrigerant, the expansion valve a is connect by pipeline with airtight chamber, and expansion valve a has and can reduce in the pipeline stated
The function of air pressure, therefore, when the indoor temperature of closed chamber is higher than predetermined temperature, system in the pipeline between expansion valve a and evaporator a
Cryogen further gasifies, and evaporator a makes the refrigerant evaporation after gasification to cooling down in the airtight chamber of main casing, and
The refrigerant in pipeline between evaporator a and compressor a is constantly in vaporized state and absorbs the indoor heat of closed chamber, makes
Its temperature reduces, and when refrigerant flows into compressor a, the both vapor compression after gasification is made its boiling point be higher than closed chamber by compressor a
Then indoor temperature to make its liquefaction, and makes its refrigerant liquefaction in the case where carrying out into expansion valve a by condenser a
Primary cooling.When needing to heat up in airtight chamber, changes current direction by opening solenoid operated four-way valve a, pass through electromagnetism four
Port valve a changes the flow direction of refrigerant in former temperature-fall period, realizes the heating movement of airtight chamber.
As shown in fig. 6, the humidity controlling unit includes Dehumidifying element and humidification unit, the Dehumidifying element includes
Expansion valve b, solenoid operated four-way valve b, evaporator b, reheater, compressor b, condenser b, the expansion valve b pass through pipeline and electricity
The b connection of magnetic four-way valve, the solenoid operated four-way valve b connects by pipeline with evaporator b, the evaporator b pass through pipeline and
Reheater connection, the reheater are connect by pipeline with compressor b, and the compressor b is connected by pipeline and condenser b
It connects, the condenser b is connect by pipeline with expansion valve b, is placed with refrigerant in the pipeline, is being steamed by refrigerant
Evaporation endothermic in device b is sent out, reduces the indoor temperature of closed chamber, so that the indoor part Water vapor condensation of closed chamber is steaming
Device surface is sent out, the humidity relative reduction in air is made, so that the indoor air of closed chamber is become dry cold air, and pass through reheating
Device etc. it is wet heating so that relative humidity decline.
The humidification unit includes water source storeroom, hothouse, vaporization chamber, jet pipe, and the water source storeroom is used for
The vapor water source of humidification is stored, the water source storeroom is connected with vaporization chamber by bend pipe, is set in the vaporization chamber
It is equipped with baffle plate, the vaporization chamber is connected to hothouse, and the hothouse is connect by pipeline with jet pipe, the pipeline
On be provided with regulating valve, vapour source enters vaporization chamber by bend pipe, the flowing velocity of vapour source can be slowed down by bend pipe, increase
The movement of saturated vapor, when vapour source enters vaporization chamber by bend pipe, by baffle plate by the condensed moisture of the steam of saturation from
Out, isolated steam enters hothouse, enters in the airtight chamber of shell finally by jet pipe, realizes the humidification of airtight chamber
Movement.
The system further includes display, alarm, the display and alarm with AT89C51 single-chip microcontroller
Output end connection, judges to need how many temperature and humidity adjusted by experiment temperature and humidity shown by display, leads to after feedback
Keyboard input is crossed required temperature and humidity is written, is input in single-chip microcontroller by an other paths, is shown at this time
Device input terminal is connected with the output end of single-chip microcontroller.When the experiment intracorporal temperature and humidity of shell is more than the temperature and humidity model that single-chip microcontroller is pre-seted
When enclosing, alarm can be output to from single-chip microcontroller to trigger alarm, to people to prompt.
The single-chip microcontroller uses AT89C51 single-chip microcontroller, and the 1-8 pin of the AT89C51 single-chip microcontroller is to convert with A/D
Device connection；
The 39-32 pin of the AT89C51 single-chip microcontroller is connect with display；
The 20-22 pin of the AT89C51 single-chip microcontroller is connect with alarm；
The 23-25 pin of the AT89C51 single-chip microcontroller is connect with temperature control unit；
The 26-27 pin of the AT89C51 single-chip microcontroller is connect with humidity controlling unit.
The above embodiments and description only illustrate the principle of the present invention and most preferred embodiment, is not departing from this
Under the premise of spirit and range, various changes and improvements may be made to the invention, these changes and improvements both fall within requirement and protect
In the scope of the invention of shield.
Claims (10)
1. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine, it is characterised in that: including main casing, with
And the temperature and humidity control system being connect with the airtight chamber of main casing, it is carried out with the temperature and humidity of the particular encapsulated chamber to main casing
Corresponding adjustment, makes experiment have relatively good temperature and humidity environment；
The temperature and humidity control system includes temperature and humidity collection unit, A/D converter, single-chip microcontroller and Temperature and Humidity Control system
System, the airtight chamber of the main casing connect with temperature and humidity collection unit, and the temperature and humidity collection unit is converted by A/D
Device is connect with single-chip microcontroller, and the single-chip microcontroller is connected by the airtight chamber of temperature and humidity control system and main casing, the temperature
Humidity control system includes temperature control unit, humidity controlling unit.
2. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 1, special
Sign is: the main casing includes upper housing and lower case, and the upper housing connect to form airtight chamber with lower case.
3. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 1, special
Sign is: the temperature and humidity collection unit includes temperature collection circuit and humidity collection circuit；
The temperature sensor that the temperature collection circuit uses for the integrated temperature sensor of AD590 type, adopt by the humidity
Collector uses humidity sensor for the soil moisture sensor of TDR-3 type, the integrated temperature sensor AD590 and TDR-
The soil moisture sensor of 3 types is arranged in the airtight cavity of main casing for acquiring the intracorporal temperature and humidity of closed chamber, and
And the soil moisture sensor of integrated temperature sensor AD590 and TDR-3 type is respectively provided with 4 tunnel signal acquisitions.
4. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 1, special
Sign is: the quantity of the model ADC0809, the A/D converter ADC0809 of the A/D converter are 2, and 2 A/D turn
The input terminal of parallel operation is respectively with temperature collection circuit, humidity collection circuit connection, and the output end of 2 A/D converters is and monolithic
The input terminal of machine connects.
5. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 1, special
Sign is: the temperature control unit includes heating unit and temperature reducing unit, the temperature control unit include expansion valve
A, evaporator a, condenser a, compressor a, solenoid operated four-way valve a, the solenoid operated four-way valve a are connect by pipeline with expansion valve a,
The expansion valve a is connect by pipeline with evaporator a, and the evaporator a is connect by pipeline with compressor a, described
Compressor a is connect by pipeline with condenser a, and the condenser a is connect by pipeline with expansion valve a, in the pipeline
It is placed with refrigerant, the expansion valve a is connected to by pipeline with airtight chamber, wherein the flowing of refrigerant in temperature-fall period
Direction is opposite with temperature-rise period.
6. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 1, special
Sign is: the humidity controlling unit includes Dehumidifying element and humidification unit, and the Dehumidifying element includes expansion valve b, electricity
Magnetic four-way valve b, evaporator b, reheater, compressor b, condenser b, the expansion valve b are connected by pipeline and solenoid operated four-way valve b
It connecing, the solenoid operated four-way valve b is connect by pipeline with evaporator b, and the evaporator b is connect by pipeline with reheater,
The reheater is connect by pipeline with compressor b, and the compressor b is connect by pipeline with condenser b, and described is cold
Condenser b is connect by pipeline with expansion valve b；
The humidification unit includes water source storeroom, hothouse, vaporization chamber, jet pipe, and the water source storeroom is for storing
The vapor water source of humidification, the water source storeroom are connected with vaporization chamber by bend pipe, are provided in the vaporization chamber
Baffle plate, the vaporization chamber are connected to hothouse, and the hothouse is connect by pipeline with jet pipe, are set on the pipeline
It is equipped with regulating valve.
7. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 3, special
Sign is: the temperature collection circuit is by I/U conversion circuit, impedance inverter circuit, voltage amplification and zero shift circuit group
At the I/U conversion circuit is made of temperature sensor AD 590, the power supply of 12V, resistance R1, R2, the temperature sensing
One end of device AD590 and the power supply of 12V connect, and the other end is in series with the resistance R1 and swept resistance R2 that resistance value is 1k Ω, resistance
The electric current flowed through on R1, R2 will be directly proportional with dut temperature, and the both ends resistance R1, R2 will have the voltage signal of 1mv/K at this time；
The impedance inverter circuit is made of linear amplifier A1 and linear amplifier A2, the temperature sensor AD 590
It is also connect with the positive input of linear amplifier A1, the direction input terminal of the linear amplifier A1 and output end are and linearly
The reverse input end of amplifier A2 connects, and the positive input of the linear amplifier A2 is grounded through resistance R5, described linear
The output end and voltage amplification and zero shift circuit connection of amplifier A2；
The voltage amplification and zero shift circuit is the zeroing circuit being made of linear amplifier A3 and multiple resistance, described
The reverse input end of linear amplifier A3 connect through resistance R10 with the output end of linear amplifier A2, the Linear Amplifer
The positive input of device A3 is grounded through resistance R13, is in series between the reverse input end and output end of the linear amplifier A3
Resistance R11 and swept resistance R12.
8. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 3, special
Sign is: the humidity collection circuit includes humidity sensor TDR-3, comparator C4HC14, selector 74HC4352, linear
Amplifier A4, linear amplifier A5, linear amplifier A6, linear amplifier A7, zero potentiometer RW；
When relative humidity be 0~50% when, comparator C4HC14 export VT be low level, the A0=" 0 " of selector 74HC4352,
The output signal U IN of TDR-3 is exported from the end Y1, flows through linear amplifier A4, is sent out from selection end IN1.
When relative humidity is 50%~100%, it is high level, the A0=of selector 74HC4352 that comparator C4HC14, which exports VT,
" 1 ", signal UIN are exported from the end Y2, by linear amplifier A5, linear amplifier A6, selection port IN2 output.
9. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 8, special
Sign is: the system further includes display, alarm, the display and alarm with AT89C51 single-chip microcontroller
Output end connection.
10. a kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine according to claim 9, special
Sign is: the single-chip microcontroller uses AT89C51 single-chip microcontroller, and the 1-8 pin of the AT89C51 single-chip microcontroller is to convert with A/D
Device connection；
The 39-32 pin of the AT89C51 single-chip microcontroller is connect with display；
The 20-22 pin of the AT89C51 single-chip microcontroller is connect with alarm；
The 23-25 pin of the AT89C51 single-chip microcontroller is connect with temperature control unit；
The 26-27 pin of the AT89C51 single-chip microcontroller is connect with humidity controlling unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910010490.6A CN109521823A (en) | 2019-01-07 | 2019-01-07 | A kind of temperature and humidity control system suitable for MMS-2A friction and wear tester |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910010490.6A CN109521823A (en) | 2019-01-07 | 2019-01-07 | A kind of temperature and humidity control system suitable for MMS-2A friction and wear tester |
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| CN109521823A true CN109521823A (en) | 2019-03-26 |
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| CN201910010490.6A Pending CN109521823A (en) | 2019-01-07 | 2019-01-07 | A kind of temperature and humidity control system suitable for MMS-2A friction and wear tester |
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Citations (4)
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|---|---|---|---|---|
| CN103245580A (en) * | 2013-04-02 | 2013-08-14 | 南京航空航天大学 | Environment test device for idler wheel abrasion tester |
| CN106742559A (en) * | 2016-12-21 | 2017-05-31 | 南京航空航天大学 | A kind of low temperature friction wear testing machine double-layer heat insulation body structure |
| CN206339258U (en) * | 2016-11-11 | 2017-07-18 | 广东科学技术职业学院 | Laboratory safety-protection system based on Zigbee |
| CN209388202U (en) * | 2019-01-07 | 2019-09-13 | 五邑大学 | A kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine |
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2019
- 2019-01-07 CN CN201910010490.6A patent/CN109521823A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245580A (en) * | 2013-04-02 | 2013-08-14 | 南京航空航天大学 | Environment test device for idler wheel abrasion tester |
| CN206339258U (en) * | 2016-11-11 | 2017-07-18 | 广东科学技术职业学院 | Laboratory safety-protection system based on Zigbee |
| CN106742559A (en) * | 2016-12-21 | 2017-05-31 | 南京航空航天大学 | A kind of low temperature friction wear testing machine double-layer heat insulation body structure |
| CN209388202U (en) * | 2019-01-07 | 2019-09-13 | 五邑大学 | A kind of temperature and humidity control system suitable for MMS-2A friction wear testing machine |
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