CN107643416A - A kind of new automatic condensation point tester and its method of testing - Google Patents
A kind of new automatic condensation point tester and its method of testing Download PDFInfo
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Abstract
The present invention provides a kind of new automatic condensation point tester and its method of testing, the new automatic condensation point tester includes testing tube, optical detection device, tilting gearing and temperature control device, optical detection device is arranged in the mouth of pipe of testing tube, to form a relatively closed environment, testing tube is fixed on tilting gearing and is arranged in thermostat；Tilting gearing makes testing tube slowly tilt, while the level change of optical detection device detection testing sample, and when the liquid level for detecting testing sample changes, testing tube stops tilting and recovering plumbness.The present invention coordinates low dip device to detect sample using the principle of reflection of light, can be automatically performed the test of petroleum products questionable points, and cleans and dry testing tube automatically.One-time detection success is ensured during test at the uniform velocity temperature-fall period, the testing time is substantially reduced, improves measuring accuracy.
Description
Technical Field
The invention relates to a low-temperature condensation point testing instrument, in particular to a novel full-automatic condensation point testing instrument and a testing method thereof.
Background
The condensation point is an important quality index of petroleum products, most of the currently used condensation point testing instruments are manual, the condensation point testing of a sample needs a repeated process of heating to 50 +/-1 ℃ and then cooling to an expected condensation point, the manual accuracy is not high, and the efficiency is low.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a novel full-automatic condensation point testing instrument and a testing method thereof, so as to overcome the defects in the prior art.
In order to achieve the aim, the invention provides a novel full-automatic condensation point testing instrument which comprises a testing sample cup, a testing tube, a thermostatic bath, a light detection device, an inclination device, a temperature control system, a control system and a cleaning device, wherein the testing sample cup is arranged in the testing tube; the test tube is connected with the test sample cup through an oil-resistant tube, the oil-resistant tube is provided with a first peristaltic pump, and the first peristaltic pump pumps a sample to be tested in the test sample cup into the test tube; the light detection device is vertically arranged in a pipe orifice of the test pipe, and the test pipe is fixed on the tilting device in a vertical state and is arranged in the constant temperature groove; the control system controls the tilting device to enable the testing tube to tilt slowly, and controls the optical detection device to detect the liquid level change of the sample to be tested, and when the liquid level change of the sample to be tested is detected, the testing tube stops tilting and returns to a vertical state; the temperature control system comprises a compressor, a heater, a temperature controller and a temperature sensor; the temperature sensor senses the temperatures of a sample to be measured and the constant temperature medium and feeds the temperatures back to the control system; the cleaning device comprises a waste liquid bottle, a cleaning bottle, a second peristaltic pump, an electromagnetic valve, an air suction pump and a liquid level sensor; the cleaning bottle is connected with the testing tube through the second peristaltic pump, so that the cleaning liquid is pumped into the testing tube, the amount of the pumped cleaning liquid is controlled by the liquid level sensor, the testing tube is connected with the waste liquid bottle through the electromagnetic valve, and the waste liquid bottle is connected with the air suction pump, so that the tested sample and the cleaning liquid are pumped into the waste liquid bottle.
As a further description of the novel full-automatic freezing point testing apparatus of the present invention, preferably, the light detection device includes a light emitting device, a light receiving device and a lens; the light emitting device faces the surface of the sample to be measured vertically downwards, a lens is arranged on one side of the light emitting device, and the light receiving device is arranged on the upper portion of the lens and faces the surface of the sample to be measured vertically downwards.
As a further description of the novel full-automatic freezing point testing instrument, preferably, the tilting device comprises a stepping motor, a turbine worm, a first gearwheel, a pinion, a second gearwheel and a measuring rack; wherein, be connected with a turbine scroll bar on step motor's the output shaft, turbine scroll bar and first gear wheel meshing are connected, and one side coaxial coupling of first gear wheel has the pinion, and the pinion is connected with second gear wheel meshing, and one side coaxial coupling of second gear wheel has the measuring rack to connect, and the test tube is fixed on the measuring rack to make test tube and optical detection device rotate according to the step of 0.9 degree per step.
As a further description of the novel full-automatic freezing point testing apparatus of the present invention, preferably, the rotation ratio of the turbine worm and the first gearwheel is 62: 1, the ratio of the rotation number of the small gear to the rotation number of the second large gear is 3: 1.
as a further description of the novel full-automatic freezing point testing apparatus of the present invention, preferably, the compressor is a cascade type dual compressor, and when the temperature is higher than-30 ℃, the single compressor refrigeration cooling bath is started, and when the temperature is lower than-30 ℃, the dual compressor refrigeration metal bath is started.
As a further description of the novel full-automatic condensation point testing instrument, preferably, the thermostatic bath is a stainless metal bath, and the distance between the inner wall of the stainless metal bath and the testing tube is 3 mm.
In order to achieve another object of the present invention, the present invention further provides a testing method of the novel full-automatic freezing point testing apparatus, the testing method comprising the following steps:
step 1): firstly, putting 15ml of a sample to be tested into a test sample cup, starting a test key during testing, and pumping the sample to be tested into a test tube from the test sample cup through a first peristaltic pump;
step 2): the control system controls the temperature controller to start the heater to heat and preheat the sample to be measured, and when the temperature of the sample to be measured reaches 50 +/-1 ℃, the heating is stopped; the control system controls the temperature controller to start the compressor to refrigerate the sample to be measured, and simultaneously controls the heater to perform pulse heating to ensure that the deviation between the temperature of the sample to be measured and the temperature of the cold bath is 9 +/-1 ℃ in the cooling process;
step 3): when the temperature of the sample to be detected reaches 10 ℃ before the expected condensation point, the control system starts the tilting device to slowly tilt the test tube, and simultaneously the control system starts the optical detection device to detect the liquid level change;
step 4): in the process of inclining the test tube, the temperature of the sample to be tested is reduced by 2 ℃, the optical detection device carries out detection once, and once the liquid level of the sample to be tested is detected to move, the inclination device stops inclining immediately and enables the test tube to be in a vertical state; or,
step 5): in the process that the test tube is inclined, the optical detection device does not detect the liquid level change of the sample to be tested, when the test tube and the horizontal plane form an included angle of 45 degrees, the test tube is kept in the state for 5S, the liquid level of the sample to be tested is not changed, and the temperature of the sample to be tested is the condensation point of the sample;
step 6): after the test is finished, when the test tube is restored to the vertical state, the control system automatically controls the temperature controller to start the heater to heat the tested sample, when the tested sample is heated to 50 +/-1 ℃, the electromagnetic valve and the air pump are opened, and the sample is pumped into the waste liquid bottle;
step 7): opening a second peristaltic pump, pumping the cleaning liquid in the cleaning bottle into the test tube, cleaning the test tube, stopping for a plurality of seconds, opening the electromagnetic valve and the air pump again, pumping the waste liquid into the waste liquid bottle, repeating the steps for 2-3 times, and cleaning the test tube;
step 8): and opening the electromagnetic valve and the air pump to vacuumize the test tube, wherein air flow enters from the air hole on the outer wall of the test tube and is pumped out from the bottom of the test tube, and repeating the steps for 3 to 5 times to completely dry the test tube.
The invention uses the light reflection principle to match with the micro-tilting device to detect the sample, and can automatically complete the testing of the condensation point of the petroleum product. During testing, only 15ml of sample to be tested is placed into the test sample cup, test parameters are set, the instrument automatically samples, preheats and tests, and the test tube is automatically cleaned and dried after the test is completed. The advanced liquid level detection technology can be used for detecting the tiny change of the liquid level, and the detection is ensured to be successful at one time in the uniform-speed cooling process during the test, so that the test time is greatly shortened, and the test precision is improved.
Drawings
FIG. 1 is a schematic structural diagram of the novel full-automatic freezing point tester of the present invention;
FIG. 2 is a schematic diagram of a photodetector device according to the present invention;
FIG. 3 is a schematic view of the construction of the tilting device of the present invention;
fig. 4 is a gas circuit connection diagram of the cleaning device of the present invention.
Detailed Description
To further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solutions of the present invention and are not to limit the present invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of the novel full-automatic freezing point testing apparatus of the present invention; the novel full-automatic condensation point testing instrument comprises a testing sample cup 1, a testing tube 2, a thermostatic bath 3, a light detection device 4, an inclination device 5, a temperature control system 6, a control system 7 and a cleaning device 8; the test tube 2 is connected with the test sample cup 1 through an oil-resistant tube, a first peristaltic pump 11 is arranged on the oil-resistant tube, and the first peristaltic pump 11 pumps a sample to be tested in the test sample cup 1 into the test tube 2; the light detection device 4 is vertically arranged in a pipe orifice of the test pipe 2, the test pipe 2 is fixed on the tilting device 5 in a vertical state and is arranged in the constant temperature bath 3, the constant temperature bath 3 is a stainless cylinder metal bath, and the interval distance between the inner wall of the stainless cylinder metal bath and the test pipe 2 is 3 mm; the control system 7 controls the tilting device 5 to slowly tilt the testing tube 2 and controls the light detection device 4 to detect the liquid level change of the sample to be tested, and when the liquid level change of the sample to be tested is detected, the testing tube 2 stops tilting and returns to the vertical state.
The temperature control system 6 comprises a compressor 61, a heater 62, a temperature controller 63 and a temperature sensor 64; the air is used as a constant temperature medium in the constant temperature tank 3, the control system 7 controls the temperature controller 63 to start the heater 62 or the compressor 61 to heat or refrigerate the constant temperature medium, and the temperature sensor 64 senses the temperature of the sample to be measured and the constant temperature medium and feeds the temperature back to the control system 7.
The control system 7 comprises a power supply, a main control board, a liquid crystal display, keys and a printer, the whole machine realizes the coordination work of all parts under the control of a high-speed kernel CYGNAL, and because the CYGNAL has extremely high running speed, the time-sharing running of two groups of stepping motors does not influence each other, the accuracy of a detection result is ensured.
Referring to fig. 4, fig. 4 is a gas circuit connection diagram of the cleaning device of the present invention; the cleaning device 8 comprises a waste liquid bottle 81, a cleaning bottle 82, a second peristaltic pump 83, an electromagnetic valve 84, an air suction pump 85 and a liquid level sensor 86; the cleaning bottle 82 is connected with the test tube 2 through the second peristaltic pump 83, so as to pump the cleaning liquid into the test tube, and the amount of the pumped cleaning liquid is controlled by the liquid level sensor 86, the test tube 2 is connected with the waste liquid bottle 81 through the electromagnetic valve 84, and the waste liquid bottle 81 is connected with the air pump 85, so as to pump the tested sample and the cleaning liquid into the waste liquid bottle. The invention utilizes the peristaltic pump to form a closed loop system by matching with the electromagnetic valve, ensures the whole automation of the working process, comprises automatic sample feeding, preheating, testing, cleaning and drying, and can be independently executed or set at one time, and the instruments are sequentially executed.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a photodetection device according to the present invention; preferably, the light detection means 4 comprises light emitting means 41, light receiving means 42 and a lens 43; wherein, the light emitting device 41 faces the surface of the sample to be measured vertically downwards, a lens 43 is arranged at one side of the light emitting device 41, and the light receiving device 42 is arranged at the upper part of the lens 43 and faces the surface of the sample to be measured vertically downwards. The light detection device 4 of the invention is carried out by utilizing the reflection principle of light, a beam of light vertically irradiates the surface of a sample, when the sample in the test tube 2 is driven by the tilting device 5 to tilt, if the sample is solidified, the light reflected by the liquid level is the same as the light flux reflected in the vertical state, if the sample is not solidified, an acute angle is formed between the liquid level of the sample and the inner wall of the test tube 2 due to the action of gravity, the light reflected to the light receiving device 42 by the liquid level is greatly reduced, and the change condition of the liquid level to be detected is judged according to the intensity of the recovered light brightness so as to achieve the purpose of detecting the condensation point; wherein, the test tube 2 and the light detection device 4 form a relatively closed environment to prevent the interference of external light, the light source can provide 660 +/-10 nm light, the emitted light is reflected by the liquid level of the sample, the light receiving device 42 is arranged at the upper part of the lens 43 to detect the light reflected by the sample, and the light reflected by the liquid level can be received to the maximum extent by adjusting the distance between the light receiving device 42 and the lens 43.
Referring to fig. 3, fig. 3 is a schematic structural view of a tilting device according to the present invention; preferably, the tilting device 5 comprises a stepping motor 51, a turbine worm 52, a first gearwheel 53, a pinion 54, a second gearwheel 55 and a measuring rack 56; wherein, be connected with a turbine worm 52 on step motor 51's the output shaft, turbine worm 52 is connected with the meshing of first gear wheel 53, one side coaxial coupling of first gear wheel 53 has pinion 54, pinion 54 is connected with the meshing of second gear wheel 55, one side coaxial coupling of second gear wheel 55 has measuring rack 56 to connect, test tube 2 is fixed on measuring rack 56, at the in-process of testing, step motor 51 drives turbine worm 52, turbine worm 52 drives first gear wheel 53, pinion 54 and second gear wheel 55, second gear wheel 55 drives measuring rack 56 and carries out work, this in-process, step motor 51 is synchronous with turbine worm 52, turbine worm 52 is 62 with the number of turns ratio of first gear wheel 53: 1, the ratio of the rotation numbers of the small gear 54 and the second large gear 55 is 3: 1, 62 rings are changeed to the turbine scroll bar promptly, and the gear wheel can change 1 ring, and first big gear wheel rotates 3 rings, and 1 ring can be changeed to the second gear, through the multiple reduction of turbine scroll bar and gear to make test tube 2 and light detection device 4 rotate according to the step of every step 0.9 degree. The invention adopts the micro-tilt technology to slowly tilt in the testing process, and the detection is carried out while tilting, once the liquid level of the sample is detected to move, the tilting is stopped immediately, and the vertical state is recovered, without heating the testing tube 2 after tilting for many times. The advanced liquid level detection technology can detect the tiny change of the liquid level by matching with the automatic tilting device, thereby ensuring the test accuracy and meeting the requirements of repeatability of 2 ℃ and parallelism of 4 ℃.
Preferably, the compressor 61 adopts a cascade double compressor and is matched with the heater 62 to realize the purpose of uniform temperature reduction, and the gradient deviation between the temperature of the sample to be tested and the temperature of the cold bath is ensured to be 9 +/-1 ℃ in the test process; when the temperature is higher than minus 30 ℃, the single-stage compressor refrigeration cold bath is started, and when the temperature is lower than minus 30 ℃, the double-compressor refrigeration metal bath is started. When the double compressors are started, the lowest temperature can reach minus 80 ℃, pulse heating is carried out through the pulse control heater 62 to balance redundant cold energy, the grading refrigeration technology can ensure that the cooling speed is uniform and stable, one-time detection success is ensured in the uniform cooling process, the testing time is greatly shortened, and the efficiency is improved.
The invention also provides a testing method of the novel full-automatic condensation point testing instrument, which comprises the following steps:
1) step: sample preparation: before testing, 15ml of sample to be tested is put into the test sample cup 1; when in test, only the test key needs to be started, and a sample to be tested can be pumped into the test tube 2 from the test sample cup 1 through the first peristaltic pump 11, so that the test method is simple and convenient.
Step 2) of: heating the sample: when the test key is started, the control system 7 controls the temperature controller 63 to start the heater 62 to heat the constant temperature medium in the constant temperature bath 3, and then the sample to be tested is heated and preheated. The temperature sensor 64 monitors the temperature value of the sample to be measured in real time and feeds the temperature value back to the control system 7, and when the temperature of the sample to be measured reaches 50 +/-1 ℃, the heater 62 stops continuously heating; the control system 7 controls the temperature controller 63 to start the compressor 61 to refrigerate the sample to be measured, and simultaneously, the control system 7 controls the heater 62 to perform pulse heating to ensure that the deviation between the temperature of the sample to be measured and the temperature of the cold bath is 9 +/-1 ℃ in the cooling process, so that the uniform and stable cooling speed is realized.
Step 3) of: starting sample condensation point detection: the temperature sensor 64 monitors the temperature value of the sample to be detected in real time and feeds the temperature value back to the control system 7, when the temperature of the sample to be detected reaches 10 ℃ before the expected condensation point, the control system 7 starts the tilting device 5 to slowly tilt the testing tube 2, and meanwhile, the control system 7 starts the light detection device 4 to detect the liquid level change.
Step 4), the following steps: detecting the sample while inclining: the temperature sensor 64 monitors the temperature value of the sample to be detected in real time and feeds the temperature value back to the control system 7, the light detection device 4 carries out detection once when the temperature of the sample to be detected is reduced by 2 ℃ in the inclination process of the test tube 2, and once the liquid level of the sample to be detected is detected to move, the inclination device 5 stops inclining immediately and enables the test tube 2 to recover the vertical state; or,
step 5): the testing tube 2 is continuously cooled by 2 ℃ in the process of inclination, and is inclined for detection again, and the process is repeated, the light detection device 4 does not detect the liquid level change of the sample to be detected, so that the testing tube 2 is kept in the state for 5S when the testing tube 2 forms an included angle of 45 degrees with the horizontal plane, the liquid level of the sample to be detected is not changed, and the temperature of the sample to be detected is the condensation point of the sample. After the test is finished, the control system 7 can store the test data and print out the result.
6) step: discharging sample waste liquid: after the test is finished, when the test tube 2 is recovered to the vertical state, the control system 7 automatically controls the temperature controller 63 to start the heater 62 to heat the tested sample, and when the tested sample is heated to 50 +/-1 ℃, the electromagnetic valve 84 and the air suction pump 85 are opened, and the sample is sucked into the waste liquid bottle 81.
7) step: cleaning the test tube: and opening the second peristaltic pump 83, pumping the cleaning solution in the cleaning bottle 82 into the test tube 2, cleaning the test tube 2, controlling the amount of the liquid inlet amount by using the liquid level sensor 86, stopping the liquid inlet when the liquid level in the test tube 2 rises to the liquid level sensor 86, stopping the liquid inlet for a plurality of seconds, opening the electromagnetic valve 84 and the air pump 85 again, pumping the waste liquid into the waste liquid bottle 81, repeating the steps for 2-3 times, and cleaning the test tube 2 or attaching only a small amount of the cleaning solution left in the test tube 2 to the tube wall of the test tube 2.
8) step: drying the test tube: the electromagnetic valve 84 and the air pump 85 are opened to vacuumize the test tube 2, air flow enters from the air hole on the outer wall of the test tube 2 and is pumped out from the bottom of the test tube 2, the heated air flow can easily take away residual cleaning liquid attached to the side face and the bottom of the tube wall in the circulation process, the air flow stops buffering for a period of time after being vacuumized for a period of time, the process is repeated for 3 to 5 times, the test tube can be completely dried by the jeer, and the next test can be prepared after the process is finished.
It should be noted that the above summary and the detailed description are intended to demonstrate the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the scope of the present invention. Various modifications, equivalent substitutions, or improvements may be made by those skilled in the art within the spirit and principles of the invention. The scope of the invention is to be determined by the appended claims.
Claims (7)
1. A novel full-automatic condensation point testing instrument is characterized by comprising a testing sample cup (1), a testing tube (2), a thermostatic bath (3), a light detection device (4), an inclination device (5), a temperature control system (6), a control system (7) and a cleaning device (8); wherein,
the test tube (2) is connected with the test sample cup (1) through an oil-resistant tube, a first peristaltic pump (11) is arranged on the oil-resistant tube, and the first peristaltic pump (11) pumps a sample to be tested in the test sample cup (1) into the test tube (2);
the light detection device (4) is vertically arranged in the pipe orifice of the test pipe (2), and the test pipe (2) is fixed on the tilting device (5) in a vertical state and is arranged in the constant temperature groove (3); the control system (7) controls the tilting device (5) to slowly tilt the test tube (2) and controls the light detection device (4) to detect the liquid level change of the sample to be detected, and when the liquid level change of the sample to be detected is detected, the test tube (2) stops tilting and returns to the vertical state;
the temperature control system (6) comprises a compressor (61), a heater (62), a temperature controller (63) and a temperature sensor (64); the air is used as a constant temperature medium in the constant temperature tank (3), the control system (7) controls the temperature controller (63) to start the heater (62) or the compressor (61) to heat or refrigerate the constant temperature medium, and the temperature sensor (64) senses the temperature of the sample to be measured and the constant temperature medium and feeds the temperature back to the control system (7);
the cleaning device (8) comprises a waste liquid bottle (81), a cleaning bottle (82), a second peristaltic pump (83), an electromagnetic valve (84), an air pump (85) and a liquid level sensor (86); the cleaning bottle (82) is connected with the testing tube (2) through the second peristaltic pump (83) so as to pump cleaning liquid into the testing tube, the amount of the pumped cleaning liquid is controlled by the liquid level sensor (86), the testing tube (2) is connected with the waste liquid bottle (81) through the electromagnetic valve (84), and the waste liquid bottle (81) is connected with the air suction pump (85) so as to pump tested samples and the cleaning liquid into the waste liquid bottle.
2. The new fully automatic freezing point testing instrument according to claim 1, wherein the light detection device (4) comprises a light emitting device (41), a light receiving device (42) and a lens (43); the light emitting device (41) faces the surface of the sample to be measured vertically downwards, a lens (43) is arranged on one side of the light emitting device (41), and the light receiving device (42) is arranged on the upper portion of the lens (43) and faces the surface of the sample to be measured vertically downwards.
3. The new type of automatic freezing point testing instrument according to claim 1, wherein the tilting device (5) comprises a stepping motor (51), a turbine worm (52), a first gearwheel (53), a pinion (54), a second gearwheel (55) and a measuring rack (56); wherein, be connected with a turbine scroll bar (52) on the output shaft of step motor (51), turbine scroll bar (52) and first gear wheel (53) meshing are connected, one side coaxial coupling of first gear wheel (53) has pinion (54), pinion (54) and second gear wheel (55) meshing are connected, one side coaxial coupling of second gear wheel (55) has measuring rack (56) to connect, test tube (2) are fixed on measuring rack (56) to make test tube (2) and light detection device (4) rotate according to the step of 0.9 degree per step.
4. The new full-automatic condensation point testing instrument according to claim 3, characterized in that the ratio of the number of revolutions of the turbine worm (52) to the first gearwheel (53) is 62: 1, the ratio of the number of turns of the small gear (54) to the number of turns of the second large gear (55) is 3: 1.
5. the new type of fully automatic freezing point tester as claimed in claim 1, wherein the compressor (61) is a cascade type double compressor, and the single compressor refrigeration cooling bath is turned on when the temperature is higher than-30 ℃, and the double compressor refrigeration metal bath is turned on when the temperature is lower than-30 ℃.
6. The novel full-automatic condensation point testing instrument according to claim 1, characterized in that the thermostatic bath (3) is a stainless cylinder metal bath, and the inner wall of the stainless cylinder metal bath is 3mm away from the testing tube (2).
7. A method for testing a novel full-automatic freezing point testing instrument according to any one of claims 1 to 6, wherein the method comprises the following steps:
step 1): firstly, putting 15ml of a sample to be tested into a test sample cup (1), starting a test key during testing, and pumping the sample to be tested into a test tube (2) from the test sample cup (1) through a first peristaltic pump (11);
step 2): the control system (7) controls the temperature controller (63) to start the heater (62) to heat and preheat the sample to be measured, and when the temperature of the sample to be measured reaches 50 +/-1 ℃, the heating is stopped; the control system (7) controls the temperature controller (63) to start the compressor (61) to refrigerate the sample to be measured, and simultaneously, the control system (7) controls the heater (62) to perform pulse heating to ensure that the deviation between the temperature of the sample to be measured and the temperature of the cold bath is 9 +/-1 ℃ in the cooling process;
step 3): when the temperature of the sample to be detected reaches 10 ℃ before the expected condensation point, the control system (7) starts the tilting device (5) to slowly tilt the test tube (2), and simultaneously the control system (7) starts the light detection device (4) to detect the liquid level change;
step 4): in the process of inclining the test tube (2), the temperature of the sample to be tested is reduced by 2 ℃ every time, the light detection device (4) carries out detection once, and once the liquid level of the sample to be tested is detected to move, the inclining device (5) stops inclining immediately and enables the test tube (2) to be recovered to be in a vertical state; or,
step 5): in the process that the test tube (2) is inclined, the light detection device (4) does not detect the liquid level change of the sample to be detected, when the test tube (2) forms an included angle of 45 degrees with the horizontal plane, the test tube (2) is kept in the state for 5S, the liquid level of the sample to be detected is not changed, and the temperature of the sample to be detected is the condensation point of the sample;
step 6): after the test is finished, when the test tube (2) is recovered to a vertical state, the control system (7) automatically controls the temperature controller (63) to start the heater (62) to heat the tested sample, when the tested sample is heated to 50 +/-1 ℃, the electromagnetic valve (84) and the air suction pump (85) are opened, and the sample is sucked into the waste liquid bottle (81);
step 7): opening a second peristaltic pump (83), pumping the cleaning liquid in the cleaning bottle (82) into the test tube (2), cleaning the test tube (2), stopping for a plurality of seconds, opening the electromagnetic valve (84) and the air suction pump (85) again, pumping the waste liquid into the waste liquid bottle (81), repeating the steps for 2-3 times, and cleaning the test tube (2);
step 8): and opening the electromagnetic valve (84) and the air pump (85) to vacuumize the test tube (2), wherein air flow enters from the air hole on the outer wall of the test tube (2) and is pumped out from the bottom of the test tube (2), and repeating the steps for 3 to 5 times to completely dry the test tube.
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