CN114778027A - Water purification complete machine test system based on TTL communication and test method thereof - Google Patents
Water purification complete machine test system based on TTL communication and test method thereof Download PDFInfo
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- CN114778027A CN114778027A CN202210677065.4A CN202210677065A CN114778027A CN 114778027 A CN114778027 A CN 114778027A CN 202210677065 A CN202210677065 A CN 202210677065A CN 114778027 A CN114778027 A CN 114778027A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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Abstract
The invention relates to a water purification complete machine test system based on TTL communication and a test method thereof, wherein the test system comprises an upper computer, a PLC control module, a TTL communication module, a water purifier to be tested and a flow pressure test system, the upper computer and the PLC control module perform data interaction and are used for controlling the sending and receiving of characters, a communication interface of the water purifier to be tested is connected with the upper computer through a data line, the TTL communication module is used for converting a communication protocol between the water purifier to be tested and the upper computer, and the PLC control module controls the flow pressure test system and transmits test data to the upper computer; the detection time of the invention is completely controllable, and the test program can be switched by itself; the abnormity of a certain element in the water purification complete machine can be detected specifically without damaging the pipeline in the water purification complete machine; the test accuracy and efficiency are high.
Description
Technical Field
The invention relates to the technical field of automatic testing, in particular to a water purification complete machine testing system based on TTL communication and a testing method thereof.
Background
In the purifier production test process, need carry out a series of sealed tests to its inside pipeline, in addition, still need test its inside components and parts function, traditional test method is the work of going up electricity according to the inside computer control components and parts of purifier product mostly, carries out outside flow pressure on this basis simultaneously and just comes to judge whether qualified function, and this kind of mode has following several disadvantages more: 1. the detection time is completely controlled by the system, and automatic switching cannot be realized outside; 2. whether specific functions of components are abnormal or not cannot be confirmed; 3. the rate of erroneous judgments is high.
Disclosure of Invention
Based on this, the invention aims to provide a water purification complete machine test system and a test method thereof based on TTL communication, which can test the functions of the water purification complete machine product more quickly and accurately.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a water purifying complete machine testing system based on TTL communication is characterized by comprising an upper computer, a PLC control module, a TTL communication module, a water purifier to be tested and a flow pressure testing system, wherein the flow pressure testing system comprises a front detection module arranged at the front end of a water inlet of the water purifier to be tested and a tail end detection module which is connected in series and arranged at the rear ends of a pure water inlet and a waste water inlet of the water purifier to be tested,
the prepositive detection module comprises a first gas detection passage, a functional detection passage, a gas source filtering module, a gas detection pressure regulating valve, a proportional valve, a gas detection valve, a work detection pressure regulating valve and a first pressure sensor, one end of the first air detection passage is communicated with the water inlet of the water purifier to be detected, the other end of the first air detection passage is externally connected with an air source device, the air source filtering module is arranged at the air supply end of the external air source device, the air detection pressure regulating valve, the proportional valve, the air detection valve and the first pressure sensor are sequentially erected on a first air detection passage between the air source filtering module and the water inlet of the water purifier to be detected, the functional detection passage is connected in parallel to one side of the first gas detection passage, one end of the functional detection passage is communicated with the gas outlet of the gas source filtering module, the other end of the functional detection passage is communicated with the first gas detection passage at the gas inlet end of the first pressure sensor, and the work detection pressure regulating valve and the work detection valve are sequentially erected on the functional detection passage;
the tail end detection module comprises a second gas detection passage, a first gas valve, a second gas valve, a first gas exhaust valve, a second gas exhaust valve, a first flowmeter, a second pressure sensor and a third pressure sensor, one end of the second gas detection passage is communicated with a pure water port of the water purifier to be detected, the other end of the second gas detection passage is communicated with a waste water port of the water purifier to be detected, the second pressure sensor and the third pressure sensor are sequentially arranged on the second gas detection passage on one side of the pure water port and the waste water port, the first gas valve and the second gas valve are sequentially arranged at the middle section position of the second gas detection passage, one side of the second gas detection passage between the first gas valve and the second pressure sensor is externally connected with the first gas exhaust passage, the first gas exhaust valve and the first flowmeter are sequentially arranged on the first gas exhaust passage, one side of the second gas detection passage between the second gas valve and the third pressure sensor is externally connected with the second gas exhaust passage, the second exhaust valve and the second flowmeter are sequentially erected on the second exhaust passage;
the upper computer and the PLC control module are used for data interaction and sending and receiving control words, the communication interface of the water purifier to be tested is connected with the upper computer through a data line, the TTL communication module is used for converting a communication protocol between the water purifier to be tested and the upper computer, and the PLC control module controls the flow pressure testing system and transmits test data to the upper computer.
As a preferred technical scheme, the TTL communication module is a URAT-485 communication module.
A testing method of a water purification complete machine testing system based on TTL communication is characterized by comprising the following steps:
(1) switching a control program of a computer board of the water purifier to be tested into a gas detection test mode;
(2) the upper computer performs data interaction with the water purifier to be detected through the TTL communication module, converts the TTL level signal into an RS485 level signal, sends a self-checking control word to a computer board control program of the water purifier to be detected, runs a self-checking frame corresponding to the self-checking control word according to the self-checking control word, frames response information and sends the response information back to the upper computer, and the upper computer checks whether the function of the water purifier to be detected is lost or not according to the content of the returned frame;
(3) repeating the step (2) until all the self-checking frames corresponding to the self-checking control words are tested and no abnormal function is lost, and ending the gas detection test mode;
(4) the PLC control module controls all control valves of the front detection module and the tail end detection module to be opened, an external air source device charges compressed air into a water purifier to be detected through a first air detection passage, the compressed air is discharged through a pure water port and a waste water port after being charged through a water inlet of the water purifier to be detected, an air detection pressure regulating valve is regulated to 7.5KG in the charging process, a function pressure regulating valve is regulated to 3.5KG, the charging time lasts 30S, a proportional valve slowly boosts to 7.5KG, meanwhile, a booster pump in the water purifier to be detected is opened, an upper computer sends booster pump detection control words to a computer board control program of the water purifier to be detected, the computer board control program of the water purifier to be detected runs detection frames corresponding to the booster pump detection control words, response information is coded into frames and then sent back to the upper computer, and the upper computer judges whether the booster pump function is lost or not according to the content of the returned frames;
(5) the PLC control module controls to close the gas detection valve, stabilize the pressure for 20S, simultaneously close the booster pump of the water purifier to be detected, keep the pressure for 150S after the pressure stabilization is finished, in the process, the first pressure sensor, the second pressure sensor and the third pressure sensor monitor the pressure drop of the current passage section and feed monitoring data back to the upper computer, the upper computer judges whether the air tightness is qualified or not according to the pressure drop of each current passage section and the difference value between the maximum pressure and the minimum pressure, in the process, the upper computer sends heating plate detection control words to a computer board control program of the water purifier to be detected, the computer board control program of the water purifier to be detected runs detection frames corresponding to the heating plate detection control words, response information is coded into frames and then sent back to the upper computer, and the upper computer judges whether the function of the heating plate is lost or not according to the content of the returned frames;
(6) after the airtightness test in the step (5) is finished, the PLC control module controls to open a hot tank water replenishing valve in the water purifier to be tested, the pressure of raw water in the water purifier to be tested can be released to the hot tank, and whether the function of the hot tank water replenishing valve is lost can be judged by monitoring the pressure drop of the current passage section through the first pressure sensor;
(7) and stopping the external air source device from charging compressed air into the water purifier to be detected, and detecting whether the first flow meter and the second flow meter can detect flow data when the pressure drop of the current passage section is less than 0.3PSI through the first pressure sensor, so as to judge whether the function of the normal-temperature water outlet valve in the water purifier to be detected is lost.
As an optimal technical scheme, in the step (2), the self-checking function detection of the water purifier to be detected comprises water pump detection, water cut-off valve detection, switching valve detection and waste water valve detection in the water purifier to be detected.
In the step (5), the air tightness is qualified when the pressure drop of each current passage section is less than 0.6PSI and the difference value between the maximum pressure and the minimum pressure is less than 1.2 PSI.
The invention has the beneficial effects that: the detection time is completely controllable, and the test program can be automatically switched; the abnormity of a certain element in the water purification complete machine can be detected specifically without damaging the pipeline in the water purification complete machine; the test accuracy and efficiency are high.
Drawings
FIG. 1 is a block diagram showing the structure of a water purifier testing system and a testing method based on TTL communication according to the present invention;
fig. 2 is a block diagram schematically illustrating the structure of the flow pressure test system in fig. 1.
In the figure: 10-upper computer, 20-PLC control module, 30-TTL communication module, 40-water purifier to be tested, 50-flow pressure test system, 51-prepositive detection module, 51-1-first air detection passage, 51-2-functional detection passage, 51-3-air source filtering module, 51-4-air detection pressure regulating valve, 51-5-proportional valve, 51-6-air detection valve, 51-7-work detection valve, 51-8-work detection pressure regulating valve, 51-9-first pressure sensor, 52-tail end detection module, 52-1-second air detection passage, 52-2-first air valve, 52-3-second air valve, 52-4-first air exhaust valve, 52-5-second air exhaust valve, 52-6-first flow meter, 52-7-second flow meter, 52-8-second pressure sensor, 52-9-third pressure sensor, 60-air source device, 70-first exhaust passage, 80-second exhaust passage.
Detailed Description
For a better understanding and appreciation of the structural features and advantages achieved by the present invention, reference will be made to the following detailed description of preferred embodiments thereof, in conjunction with the accompanying drawings, in which:
as shown in FIGS. 1-2, a water purifier complete machine testing system based on TTL communication comprises an upper computer 10, a PLC control module 20, a TTL communication module 30, a water purifier 40 to be tested, and a flow pressure testing system 50, wherein the flow pressure testing system 50 comprises a front detection module 51 installed at the front end of a water inlet of the water purifier 40 to be tested, and a tail end detection module 52 installed at the rear ends of a pure water inlet and a waste water inlet of the water purifier 40 to be tested in series,
the prepositive detection module 51 comprises a first air detection passage 51-1, a functional detection passage 51-2, an air source filtering module 51-3, an air detection pressure regulating valve 51-4, a proportional valve 51-5, an air detection valve 51-6, a power detection valve 51-7, a power detection pressure regulating valve 51-8 and a first pressure sensor 51-9, wherein one end of the first air detection passage 51-1 is communicated with a water inlet of the water purifier 40 to be detected, the other end of the first air detection passage is externally connected with an air source device 60, the air source filtering module 51-3 is arranged at an air supply end of the externally connected air source device 60, the air detection pressure regulating valve 51-4, the proportional valve 51-5, the air detection valve 51-6 and the first pressure sensor 51-9 are sequentially arranged on the first air detection passage 51-1 between the air source filtering module 51-3 and the water inlet of the water purifier 40 to be detected, the functional detection passage 51-2 is connected with one side of the first air detection passage 51-1 in parallel, One end of the first pressure sensor 51-9 is communicated with the air outlet of the air source filtering module 51-3, the other end of the first pressure sensor 51-3 is communicated with the first air detection passage 51-1 at the air inlet end, and the work detection pressure regulating valve 51-8 and the work detection valve 51-7 are sequentially erected on the functional detection passage 51-2;
the end detection module 52 comprises a second air detection passage 52-1, a first air valve 52-2, a second air valve 52-3, a first exhaust valve 52-4, a second exhaust valve 52-5, a first flow meter 52-6, a second flow meter 52-7, a second pressure sensor 52-8 and a third pressure sensor 52-9, one end of the second air detection passage 52-1 is communicated with a pure water port of the water purifier 40 to be detected, the other end of the second air detection passage is communicated with a waste water port of the water purifier 40 to be detected, the second pressure sensor 52-8 and the third pressure sensor 52-9 are sequentially arranged on the second air detection passage 52-1 at one side of the pure water port and the waste water port, the first air valve 52-2 and the second air valve 52-3 are sequentially arranged at the middle position of the second air detection passage 52-1, and one side of the second air detection passage 52-1 between the first air valve 52-2 and the second pressure sensor 52-8 is externally connected with the outside The first exhaust passage 70, the first exhaust valve 52-4 and the first flow meter 52-6 are sequentially arranged on the first exhaust passage 70, one side of the second air detection passage 52-1 between the second air valve 52-3 and the third pressure sensor 52-9 is externally connected with the second exhaust passage 80, and the second exhaust valve 52-5 and the second flow meter 52-7 are sequentially arranged on the second exhaust passage 80.
The upper computer 10 and the PLC control module 20 perform data interaction and are used for sending and receiving control words, a communication interface of the water purifier 40 to be tested is connected with the upper computer 10 through a data line, the TTL communication module 30 is used for converting a communication protocol between the water purifier 40 to be tested and the upper computer 10, and the PLC control module 20 controls the flow pressure testing system 50 and transmits test data to the upper computer.
In this embodiment, the TTL communication module is a URAT-485 communication module.
A testing method of a water purification complete machine testing system based on TTL communication comprises the following steps:
(1) switching the control program of the computer board of the water purifier 40 to be tested into a gas detection test mode;
(2) the upper computer 10 performs data interaction with the water purifier 40 to be detected through the TTL communication module 30, converts TTL level signals into RS485 level signals, sends self-checking control words to a computer board control program of the water purifier 40 to be detected, runs self-checking frames corresponding to the self-checking control words according to the self-checking control words, frames response information and sends the response information back to the upper computer 10, and the upper computer 10 checks whether the function of the water purifier 40 to be detected is lost or not according to the content of the returned frames;
(3) repeating the step (2) until all the self-checking frames corresponding to the self-checking control words are tested and no abnormal function is lost, and ending the gas detection test mode;
(4) the PLC control module 20 controls to open all control valves of the front detection module 51 and the tail end detection module 52, the external air source device 60 charges compressed air into the water purifier 40 to be detected through the first air detection passage 51-1, the compressed air is discharged through the purified water port and the waste water port after being charged through the water inlet of the water purifier 40 to be detected, in the process of inflation, the air detection pressure regulating valve 51-4 is regulated to 7.5KG, the functional pressure regulating valve 51-8 is regulated to 3.5KG, and the inflation time lasts 30S, the proportional valve 51-5 is slowly pressurized to 7.5KG, meanwhile, the booster pump in the water purifier to be tested 40 is turned on, the upper computer 10 sends a booster pump detection control word to the computer board control program of the water purifier to be tested 40, the computer board control program of the water purifier to be tested 40 runs a detection frame corresponding to the booster pump detection control word, the response information is coded into frames and then sent back to the upper computer 10, and the upper computer 10 judges whether the function of the booster pump is lost or not according to the content of the returned frames;
(5) the PLC control module 20 controls to close the gas detection valve 51-6, stabilize the pressure for 20S, simultaneously close the booster pump of the water purifier 40 to be detected, continuously maintain the pressure for 150S after the pressure stabilization is finished, during which the first pressure sensor 51-9, the second pressure sensor 52-8 and the third pressure sensor 52-9 each monitor the pressure drop over the current path segment, and the monitoring data is fed back to the upper computer 10, the upper computer 10 judges whether the air tightness is qualified or not according to the pressure drop of each current passage section and the difference value between the maximum pressure and the minimum pressure, in the process, the upper computer 10 sends the heating plate detection control word to the computer board control program of the water purifier 40 to be detected, the computer board control program of the water purifier 40 to be detected runs the detection frame corresponding to the heating plate detection control word, the response information is sent back to the upper computer 10 after being framed, and the upper computer 10 judges whether the heating plate function is lost or not according to the content of the returned frame;
(6) after the airtightness test in the step (5) is completed, the PLC control module 20 controls to open the hot tank water supply valve in the water purifier 40 to be tested, at this time, the pressure of raw water in the water purifier 40 to be tested is released to the hot tank, and whether the function of the hot tank water supply valve is lost or not can be judged by monitoring the pressure drop of the current passage section through the first pressure sensor 51-9;
(7) and stopping the external air source device 60 from charging compressed air into the water purifier 40 to be detected, and detecting whether the first flow meter 52-6 and the second flow meter 52-7 can detect flow data when the pressure drop of the current passage section is less than 0.3PSI through the first pressure sensor 51-9, so as to judge whether the function of the normal-temperature water outlet valve in the water purifier 40 to be detected is lost.
In this embodiment, in step (2), the self-checking function detection of the water purifier to be tested 40 includes water pump inside detection, water valve off detection, switch valve detection, and waste water valve detection of the water purifier to be tested 40.
In this embodiment, in step (5), the air-tightness is qualified when the pressure drop of each current passage section is less than 0.6PSI and the difference between the maximum pressure and the minimum pressure is less than 1.2 PSI.
In this embodiment, before testing, scanning code entry product information, entering successfully presses the start button, and the host computer sends a first string of self-checking control words, can receive the data frame that the machine returned simultaneously, compares the judgement to the machine state. And after the self-checking is finished, testing the air tightness and functions of the product, testing NG, and directly quitting the test. When all the flows are finished, uploading the current test result and the test data, and ending the test;
in a specific test procedure, the control word is defined as follows:
frame header 1A 1 (i.e. first bit of self-check control word indicates frame header)
2 address E1 purifier (i.e. the second bit of the self-checking control word indicates the address of the purifier)
3 frame length 14 (i.e. the third bit of the self-checking control word represents the frame length)
4 Command word B1 (i.e. the fourth bit of the self-test control word represents a command word)
5 air detection step 01 first step (i.e. the fifth bit of the self-checking control word represents the air detection step)
6 load state 1 is marked according to position (namely 01 corresponds to a water inlet electromagnetic valve start control word, 02 corresponds to a water cut-off valve 1 start control word, 03 corresponds to a water cut-off valve 2 start control word, 04 corresponds to a switching valve start control word, 05 corresponds to a normal temperature water outlet valve start control word, 06 corresponds to a hot tank water supply valve start control word, 07 corresponds to a waste water valve start control word)
Bit0:1 (load 1 start-up); 0 (load 1 power-off) water inlet electromagnetic valve
Bit1:1 (load 1 start-up); 0 (load 1 power off) water cut-off valve 1
Bit2:1 (load 1 start-up); 0 (load 1 power off) water cut-off valve 2
Bit3:1 (load 1 start-up); 0 (load 1 power-off) switching valve
Bit4:1 (load 1 start-up); 0 (load 1 power-off) normal temperature water outlet valve
Bit5:1 (load 1 start-up); 0 (load 1 power-off) hot tank water supply valve
Bit6:1 (load 1 start-up); 0 (load 1 power-off) waste water valve
7 load state 2 booster pump with position label (i.e. 01 corresponding to booster pump start control word, 02 corresponding to water pump start control word)
Bit0:1 (load 9 on); 0 (load 9 power-off) booster pump
Bit1:1 (load 10 on); 0 (load 10 power-off) boiling water pump
The detection frame word is defined as follows:
1 header A1 (i.e. the first bit of the self-check frame indicates the header)
2 address D1 purifier (i.e. self-checking frame word second bit represents purifier address)
3 frame length 22 (i.e. the third bit of the self-checking frame word represents the frame length)
4 Command word B1 (i.e. the fourth bit of the self-test frame word represents the command word)
5 Fault code (i.e. self-test frame word fifth bit represents fault code)
6 air detection step 01 first step (i.e. the sixth bit of the self-checking frame word represents the air detection step)
7 load state 1 position marking (i.e. 01 corresponding to booster pump starting self-checking frame character, 02 corresponding to water pump starting self-checking frame character)
According to the above definitions of the control word and the detection frame word, the embodiment of performing self-test by using the water pump in the water purifier 40 to be tested is specifically described as follows:
firstly: when the upper computer 10 sends a self-checking control word of the boiled water pump to the computer board control program of the water purifier 40 to be detected, namely:
A1 E1 14 B1 02 00 02 00 00 00 00 00 00 FF
wherein the 7 th digit 02 corresponds to a water pump starting control word
Secondly, according to the self-checking control word of the boiled water pump, the computer board control program of the water purifier 40 to be tested runs the self-checking frame corresponding to the self-checking control word of the boiled water pump, and sends back the response information to the upper computer 10 after framing, namely: a 1D 116B 1 × 02000200000100000000000000000000 × D
The 7 th digit 02 is a self-checking frame character of the starting state of the water boiling pump at present, which is fed back by the water boiling pump, and the step can judge whether the internal control action of the product is normal, if the 7 th digit is 00, the starting of the water boiling pump is indicated, and the problems of circuits and components exist;
thirdly, if the boiled water pump is not started normally, the upper computer 10 further sends a self-checking control word to further judge whether the boiled water pump power is consistent with the configuration parameters, and therefore whether the boiled water pump function is lost is finally confirmed.
The detection time of the invention is completely controllable, and the test program can be switched by itself; the abnormity of a certain element in the water purifying complete machine can be detected without damaging the pipeline in the water purifying complete machine; the test accuracy and efficiency are high.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A water purifying complete machine testing system based on TTL communication is characterized by comprising an upper computer, a PLC control module, a TTL communication module, a water purifier to be tested and a flow pressure testing system, wherein the flow pressure testing system comprises a front detection module arranged at the front end of a water inlet of the water purifier to be tested and a tail end detection module which is connected in series and arranged at the rear ends of a pure water port and a waste water port of the water purifier to be tested,
the prepositive detection module comprises a first gas detection passage, a functional detection passage, a gas source filtering module, a gas detection pressure regulating valve, a proportional valve, a gas detection valve, a power detection pressure regulating valve and a first pressure sensor, one end of the first air detection passage is communicated with the water inlet of the water purifier to be detected, the other end of the first air detection passage is externally connected with an air source device, the air source filtering module is arranged at the air supply end of the external air source device, the air detection pressure regulating valve, the proportional valve, the air detection valve and the first pressure sensor are sequentially arranged on a first air detection passage between the air source filtering module and the water inlet of the water purifier to be detected, the functional detection gas circuit is connected in parallel to one side of the first gas detection passage, one end of the functional detection gas circuit is communicated with the gas outlet of the gas source filtering module, the other end of the functional detection gas circuit is communicated with the first gas detection passage at the gas inlet end of the first pressure sensor, and the power detection pressure regulating valve and the power detection valve are sequentially erected on the functional detection gas circuit;
the tail end detection module comprises a second air detection passage, a first air valve, a second air valve, a first air exhaust valve, a second air exhaust valve, a first flowmeter, a second pressure sensor and a third pressure sensor, one end of the second air detection passage is communicated with a pure water port of the water purifier to be detected, the other end of the second air detection passage is communicated with a waste water port of the water purifier to be detected, the second pressure sensor and the third pressure sensor are sequentially arranged on the second air detection passage on one side of the pure water port and the waste water port, the first air valve and the second air valve are sequentially arranged at the middle section position of the second air detection passage, one side of the second air detection passage between the first air valve and the second pressure sensor is externally connected with the first air exhaust passage, the first air exhaust valve and the first flowmeter are sequentially arranged on the first air exhaust passage, and one side of the second air detection passage between the second air valve and the third pressure sensor is externally connected with the second air exhaust passage, the second exhaust valve and the second flowmeter are sequentially erected on the second exhaust passage;
the upper computer and the PLC control module are used for data interaction and sending and receiving control words, the communication interface of the water purifier to be tested is connected with the upper computer through a data line, the TTL communication module is used for converting a communication protocol between the water purifier to be tested and the upper computer, and the PLC control module controls the flow pressure testing system and transmits test data to the upper computer.
2. The water purifying complete machine testing system based on TTL communication according to claim 1, wherein: the TTL communication module is a URAT-485 communication module.
3. The testing method of the water purifying complete machine testing system based on TTL communication according to claim 1 or 2, characterized by comprising the following steps:
(1) switching a control program of a computer board of the water purifier to be tested into a gas detection test mode;
(2) the upper computer performs data interaction with the water purifier to be detected through the TTL communication module, converts TTL level signals into RS485 level signals, sends self-checking control words to a computer board control program of the water purifier to be detected, runs self-checking frames corresponding to the self-checking control words according to the self-checking control words, frames response information and sends the response information back to the upper computer, and the upper computer checks whether the functions of the water purifier to be detected are lost or not according to the content of the returned frames;
(3) repeating the step (2) until all the self-checking frames corresponding to the self-checking control words are tested and no functional abnormality is lost, and ending the gas detection test mode;
(4) the PLC control module controls all control valves of the front detection module and the tail end detection module to be opened, an external air source device charges compressed air into a water purifier to be detected through a first air detection passage, the compressed air is discharged through a pure water port and a waste water port after being charged through a water inlet of the water purifier to be detected, an air detection pressure regulating valve is regulated to 7.5KG in the charging process, a function pressure regulating valve is regulated to 3.5KG, the charging time lasts 30S, a proportional valve slowly boosts to 7.5KG, meanwhile, a booster pump in the water purifier to be detected is opened, an upper computer sends booster pump detection control words to a computer board control program of the water purifier to be detected, the computer board control program of the water purifier to be detected runs detection frames corresponding to the booster pump detection control words, response information is coded into frames and then sent back to the upper computer, and the upper computer judges whether the booster pump function is lost or not according to the content of the returned frames;
(5) the PLC control module controls to close the gas detection valve, stabilize the pressure for 20S, simultaneously close the booster pump of the water purifier to be detected, continuously maintain the pressure for 150S after the pressure stabilization is finished, in the process, the first pressure sensor, the second pressure sensor and the third pressure sensor monitor the pressure drop of the current passage section, and feed monitoring data back to the upper computer, the upper computer judges whether the air tightness is qualified or not according to the pressure drop of each current passage section, the difference value between the maximum pressure and the minimum pressure, in the process, the upper computer sends heating disc detection control words to the computer board control program of the water purifier to be detected, the computer board control program of the water purifier to be detected runs detection frames corresponding to the heating disc detection control words, response information is coded and sent back to the upper computer, and the upper computer judges whether the function of the heating disc is lost or not according to the content of the returned frames;
(6) after the airtightness test in the step (5) is finished, the PLC control module controls to open a hot tank water supply valve in the water purifier to be tested, the pressure of raw water in the water purifier to be tested is released to the hot tank, and the pressure drop of the current passage section is monitored by the first pressure sensor to judge whether the function of the hot tank water supply valve is lost;
(7) and stopping the external air source device from charging compressed air into the water purifier to be detected, and detecting whether the first flow meter and the second flow meter can detect flow data when the pressure drop of the current passage section is less than 0.3PSI through the first pressure sensor, so as to judge whether the function of the normal-temperature water outlet valve in the water purifier to be detected is lost.
4. The test method of the water purifying complete machine test system based on TTL communication according to claim 3, wherein the test method comprises the following steps: in the step (2), the self-checking function detection of the water purifier to be detected comprises water pump opening detection, water valve breaking detection, switching valve detection and waste water valve detection in the water purifier to be detected.
5. The test method of the water purifier complete machine test system based on TTL communication of claim 3, which is characterized in that: in the step (5), the air tightness is qualified when the pressure drop of each current passage section is less than 0.6PSI and the difference value between the maximum pressure and the minimum pressure is less than 1.2 PSI.
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| CN105883972A (en) * | 2014-09-26 | 2016-08-24 | 杜也兵 | Self-check method for control part of water purifier |
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| CN114414171A (en) * | 2022-01-24 | 2022-04-29 | 中山市铧禧电子科技有限公司 | Water purifier detection method |
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