CN110907437B - Device and method for measuring condensation-preventing coating effect of stainless steel water tank - Google Patents
Device and method for measuring condensation-preventing coating effect of stainless steel water tank Download PDFInfo
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- CN110907437B CN110907437B CN201811082929.8A CN201811082929A CN110907437B CN 110907437 B CN110907437 B CN 110907437B CN 201811082929 A CN201811082929 A CN 201811082929A CN 110907437 B CN110907437 B CN 110907437B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 157
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 98
- 239000010935 stainless steel Substances 0.000 title claims abstract description 98
- 238000000576 coating method Methods 0.000 title claims abstract description 78
- 239000011248 coating agent Substances 0.000 title claims abstract description 76
- 230000000694 effects Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 10
- 238000012360 testing method Methods 0.000 claims abstract description 111
- 238000009833 condensation Methods 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 230000005494 condensation Effects 0.000 claims abstract description 22
- 238000005286 illumination Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 8
- 230000002209 hydrophobic effect Effects 0.000 claims description 7
- 239000005457 ice water Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims 1
- 230000001678 irradiating effect Effects 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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Abstract
The utility model provides a device of survey stainless steel water tank anti-condensation coating effect which characterized in that: comprises a stainless steel water tank fixedly arranged in a constant temperature and humidity cavity; the liquid receiving device is arranged at the bottom of the water tank, and a liquid dropping port is formed in the bottom of the liquid receiving device; the condensation sensing device is positioned below the liquid receiving device, a test paper which can change color when meeting water is arranged in the condensation sensing device, a light-emitting device which can irradiate on the test paper is arranged on one side of the test paper, and a sensing device which can sense the color change of the test paper is arranged on the other side of the test paper; and the photoelectric detection circuit is used for recording the illumination intensity signal of the light-emitting device detected by the sensing device after being reflected on the test paper and the time for changing the illumination intensity signal. The invention has the advantages that: compared with the existing electronic balance device, the electronic balance device has stronger anti-interference capability and more accurate test results.
Description
Technical Field
The invention relates to stainless steel water tank equipment, in particular to a device for measuring the anti-condensation coating effect of a stainless steel water tank and a method for testing the anti-condensation coating effect.
Background
The anti-condensation coating of the water tank is an inorganic coating at the bottom of the stainless steel water tank, so that the generation of condensed water and the absorption of the condensed water can be effectively reduced, the possibility that water drops fall down is reduced, and the cabinet body is prevented from getting moldy due to damp.
The anti-condensation properties of the coating refer to the ability to reduce condensation of water vapor on the surface of the coating into droplets and prevent dripping. For anti-condensation coatings, especially sink coatings, one important parameter is the initial dew point, i.e. the time at which the first droplet of condensation water on the surface of the coating is dropped. The existing device for testing the anti-condensation effect of the coating generally adopts the following structure: the temperature and humidity control bin is used for regulating and controlling the temperature and humidity conditions of a testing environment, the circulating water bath is used for regulating and controlling the temperature inside a coating carrier, the coating dewing cone, the dewing collector and the electronic day are horizontally placed in the temperature and humidity control bin, the dewing collector is placed on the electronic balance, the electronic balance is connected through a data line, and the circulating water bath is connected with the coating dewing cone through a connecting pipeline. However, the above-described test apparatus has the following problems:
1. the existing coating dewing cone is formed by coating a pattern to be measured on the cone, and two connecting holes are formed right above the cone and are connected with a circulating water bath. Because the plane right above the cone body is not protected by a coating, the upper surface of the stainless steel can generate a large amount of condensation due to the temperature difference between the inside and the outside, and the experimental result can be greatly influenced if the condensation is excessively dropped; when the cone is used, the performance of the heat insulation part can be tested only, and the real situation of the stainless steel water tank can not be simulated.
2. When the anti-condensation effect of the water tank coating is measured by using the electronic balance device, a small amount of dropping phenomenon can occur to the coating due to the rugged water tank, so that the accurate measurement of the initial dew point is affected.
3. The fixation and anti-shake of the vertebral body is not controlled by the specific means involved, which will affect the stability of each measurement.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a device for measuring the anti-condensation coating effect of the stainless steel water tank, which can effectively improve the accuracy of experimental results.
The invention aims to provide a testing method for realizing the anti-condensation coating effect of the stainless steel water tank by adopting the testing device, which has strong anti-interference capability and high accuracy of testing results.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a device of survey stainless steel water tank anti-condensation coating effect which characterized in that: the device comprises
The stainless steel water tank is fixedly arranged in a constant temperature and humidity cavity, and an anti-condensation coating is coated in the water tank;
the liquid receiving device is arranged at the bottom of the stainless steel water tank, and a liquid dropping port is formed in the bottom of the liquid receiving device;
the condensation sensing device is positioned below the liquid receiving device, a test paper which can change color when meeting water is arranged in the condensation sensing device, a light-emitting device which can irradiate on the test paper is arranged on one side of the test paper, and a sensing device which can sense the color change of the test paper is arranged on the other side of the test paper;
and the photoelectric detection circuit is used for recording the illumination intensity signal of the light-emitting device detected by the sensing device after being reflected on the test paper and the time for changing the illumination intensity signal.
Preferably, the light emitting device is an LED single color lamp. Further, the LED single-color lamp is preferably an LED blue lamp or an LED red lamp.
In order to better reflect the change of the illumination intensity of the LED blue light lamp or the red light lamp irradiated on the test paper and improve the detection sensitivity, the test paper is preferably cobalt chloride test paper.
Preferably, the sensing device can be simply a photoresistor, and the photoresistor and the LED light source are matched to form a photoelectric detection assembly.
The photoelectric detection circuit can be implemented by adopting various functional circuits in the prior art, and preferably, the photoelectric detection circuit can comprise the following functional modules:
a light emitting circuit capable of emitting light of a fixed intensity;
the sensing circuit can detect the light intensity emitted from the light-emitting circuit and reflected back by the test paper;
the power supply circuit is used for supplying power to the light-emitting circuit and the induction circuit;
the input end of the signal amplifying circuit is connected with the output end of the sensing circuit, and the signal amplifying circuit detects the output signal of the sensing circuit and amplifies the output signal;
the input end of the signal processing circuit is connected with the output end of the signal amplifying circuit, and the signal processing circuit judges whether water exists on the test paper according to the light intensity signal amplified by the signal amplifying circuit; the signal processing circuit also comprises a control end connected to the power supply circuit, and the control end sends out a signal and enables the power supply circuit to be powered off when judging that the test paper has water;
the timing device is connected with the output end of the signal processing circuit and can display the time from no water to water.
The timing device is a nixie tube which can be manually controlled to start and reset.
In order to facilitate the clamping and fixing of the water tank, preferably, the stainless steel water tank is fixed in the constant temperature and humidity cavity by an automatic clamping system, and the automatic clamping system comprises
The compressing device comprises a clamping jaw and is used for clamping the edge of the stainless steel water tank;
the transmission device is connected with the pressing device and used for driving the clamping jaw of the pressing device to open and close;
and the driving device is connected with the transmission device and used for driving the transmission device to act.
Preferably, the pressing device comprises at least two clamping jaws which are arranged along the radial direction of the notch of the stainless steel water tank in a relative manner, each clamping jaw comprises a fixed clamping portion and a movable clamping portion which can be matched with each other for use, the fixed clamping portions are fixedly arranged on the top end of the constant temperature and humidity chamber, the movable clamping portions are positioned above the fixed clamping portions, and the movable clamping portions are further provided with swinging arms which are hinged to a stand column, and the stand column is fixedly arranged on the top end of the constant temperature and humidity chamber.
Preferably, polyurethane cushion blocks are respectively arranged on the fixed clamping part and the movable clamping part. The polyurethane cushion block has elasticity, has a clamping function on water tanks with different flange edge thicknesses, prevents water drops from dripping due to shaking of the water tanks, and improves the accuracy of experimental results.
In order to further improve the stability of the clamping of the water tank and ensure uniform stress, the clamping jaw is preferably four and is crisscross arranged around the edge of the stainless steel water tank.
In order to better adapt to the constant temperature and humidity chamber, as the optimization, the transmission device is a bracket arranged outside the constant temperature and humidity chamber, the cross section of the main body part of the bracket is U-shaped, the U-shaped structure just wraps the outline of the constant temperature and humidity chamber, and the two ends of the U-shape of the bracket are respectively hinged with the tail ends of the swing arms of the clamping jaws.
In order to increase the strength of the transmission, the brackets are preferably provided with reinforcing ribs at the U-shaped folds.
Preferably, the driving device comprises a guide rail and a motor, correspondingly, the bottom of the bracket is also provided with a base capable of sliding along the guide rail, and an output shaft of the motor is connected with the base.
In order to ensure that the water drops can be completely dripped into the liquid receiving device, preferably, the liquid receiving device is a stainless steel basin body, an opening of the stainless steel basin body is larger than the bottom, and the inner surface of the stainless steel basin body is coated with a hydrophobic coating.
Preferably, the hydrophobic coating is a polytetrafluoroethylene coating. The hydrophobic coating allows the first drip to flow into the condensation sensor device quickly without adhering to the walls of the liquid receiving device.
Preferably, the distance between the liquid receiving device and the bottom of the stainless steel water tank is 10-30 cm. The distance between the liquid receiving device and the bottom of the stainless steel water tank is too small, the liquid receiving device can be affected by the temperature of the water tank to reduce the temperature, and dew can be formed on the surface of the liquid receiving device to affect the result; the distance between the liquid receiving device and the bottom of the stainless steel water tank is too large, and the dripping time of water drops is too long, so that a certain measurement error is caused.
Preferably, the drip opening aperture of the liquid receiving device is 1-2 cm. The aperture of the liquid drop port is too small, water drops form capillary effect, and cannot flow into the detection test paper; the test paper area that the aperture is too big, probably drip becomes big, and photoelectric detection system detects the facula and needs to become big, influences the result accuracy.
Preferably, a welding seal is arranged between the lower part of the liquid receiving device and the upper opening end of the condensation induction device.
In order to further improve the detection accuracy, preferably, a dehumidifier is further disposed in the condensation sensing device.
The technical scheme adopted by the invention for solving the other technical problem is as follows: the method for testing the anti-condensation coating effect of the stainless steel water tank is characterized by comprising the following steps of:
(1) Pouring an ice-water mixture into the stainless steel water tank, and controlling the temperature in the stainless steel water tank to be near the melting point of ice;
(2) Starting a light-emitting circuit under the dry state of the test paper, and recording a light intensity signal output by a signal amplifying circuit; repeating the steps for a plurality of times, taking an average value, and recording as the light intensity reference illumination P1 when the test paper is anhydrous;
(3) Starting a light-emitting circuit under the condition that the test paper is in a water state, and recording a light intensity signal output by a signal amplifying circuit; repeating the steps for a plurality of times and taking an average value, and recording as the light intensity reference illumination P2 when the test paper is water;
(4) Obtaining a light intensity reference illuminance intermediate value P' = (P1+P2)/2 of the test paper from no water to water state change;
(5) Starting a timing device, keeping the photoelectric detection circuit on, detecting a light intensity signal output by the signal amplification circuit and transmitting the light intensity signal to the signal processing circuit when water is left and drops onto the test paper, judging whether the test paper is water or not by the signal processing circuit according to a light intensity reference illuminance intermediate value P ', and if the current light intensity illuminance is less than P', the test paper is anhydrous, and circulating the step; if the current light intensity and illuminance are greater than or equal to P', the test paper has water, the timing device stops timing, and the timing device displays the time from the test paper no water to the test paper having water.
In order to prevent overflow and cause detection interference, preferably, the liquid level of the ice-water mixture in the stainless steel water tank is lower than the highest point of the anti-condensation coating in the water tank.
In order to improve the accuracy of the reference illuminance, preferably, the range of N in the steps (2) and (3) is N.gtoreq.20.
Preferably, the timing device can be manually controlled to be turned on and reset so as to facilitate flexible control.
Compared with the prior art, the invention has the advantages that:
1. the coating at the bottom of the water tank can drop in a small amount due to friction or caking, the traditional electronic balance device cannot distinguish the condition that coating particles drop and water drops drop, and the testing device of the application can only detect the condition that water drops, test paper capable of immediately changing color when meeting water is used, and whether water drops exist or not is judged by detecting the change of the color of the test paper through a photoelectric detection circuit.
2. The water tank is directly used as a coating test carrier, the real environment is better simulated, a quantitative ice-water mixture is added into the water tank, the constant temperature is realized, the temperature difference between the inner surface and the outer surface of the stainless steel with the coating can be realized, the anti-condensation performance brought by the heat insulation performance of the coating and the water absorption and hanging performance can be directly tested without other auxiliary equipment, and the obtained result has more practical reference significance.
3. The automatic clamping system is adopted to realize automatic clamping of the water tank, the polyurethane elastic clamping blocks adopted by the pressing device have clamping functions on the water tanks with different flange edge thicknesses, and water drops can be effectively prevented from being dropped due to shaking of the water tanks, so that the accuracy of experimental results is improved.
Drawings
FIG. 1 is a schematic diagram of a device for measuring the anti-condensation coating effect of a stainless steel water tank according to an embodiment of the invention.
FIG. 2 is an enlarged schematic view of the liquid receiving and detecting mechanism of the measuring apparatus shown in FIG. 1.
Fig. 3 is a top view of the measuring device shown in fig. 1.
Fig. 4 is a functional block diagram of a photodetection circuit according to an embodiment of the present invention.
FIG. 5 is a flow chart of a method for measuring the anti-condensation coating effect of a stainless steel trough according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1 to 4, the embodiment discloses a device for measuring the anti-condensation coating effect of a stainless steel water tank 1, which comprises the stainless steel water tank 1, an automatic clamping system, a liquid receiving device 6, a condensation sensing device 7 and a photoelectric detection circuit;
the stainless steel water tank 1 is fixedly arranged in the constant temperature and humidity chamber 2 through an automatic clamping system, and an anti-condensation coating 11 is coated in the stainless steel water tank 1;
in order to facilitate clamping and fixing of the stainless steel water tank 1, various automatic clamping systems in the prior art can be adopted to realize the compression of the flange edge of the stainless steel water tank 1, preferably, the automatic clamping system of the embodiment comprises a compression device, a transmission device and a driving device, wherein the compression device comprises at least two clamping jaws 31 which are arranged along the radial opposite direction of the notch of the stainless steel water tank 1 and are used for clamping the edge of the stainless steel water tank 1; in order to further improve the clamping stability of the stainless steel water tank 1 and ensure uniform stress, the clamping jaw 31 of the embodiment is four and is crisscrossed and arranged around the edge of the stainless steel water tank 1; each clamping jaw 31 comprises a fixed clamping part 311 and a movable clamping part 312 which can be matched with each other for use, the fixed clamping part 311 is fixedly arranged on the top end of the constant temperature and humidity chamber 2, the movable clamping part 312 is positioned above the fixed clamping part 311, the movable clamping part 312 is also provided with a swing arm 313, the swing arm 313 is hinged on a stand column 32, and the stand column 32 is fixedly arranged on the top end of the constant temperature and humidity chamber 2; the fixed clamping part 311 and the movable clamping part 312 are respectively provided with polyurethane cushion blocks, the polyurethane cushion blocks are elastic, the stainless steel water tanks 1 with different flange edge thicknesses are provided with clamping functions, water drops are prevented from dripping due to shaking of the stainless steel water tanks 1, and the accuracy of experimental results is improved.
The transmission device is connected with the pressing device and is used for driving the clamping jaw 31 of the pressing device to open and close; in order to be better convenient to install and realize the adaptation with the constant temperature and humidity chamber 2, the transmission device is a bracket 4 arranged outside the constant temperature and humidity chamber 2, the cross section of the main body part of the bracket 4 is U-shaped, the U-shaped structure just wraps the outer contour of the constant temperature and humidity chamber 2, and the two ends of the U-shape of the bracket 4 are respectively hinged with the tail ends of swing arms 313 of the clamping jaws 31; the bracket 4 of this embodiment has two cross-shaped structures, see the top view of fig. 3; in order to increase the strength of the transmission, the brackets 4 are also provided with reinforcing ribs 41 at each U-shaped bend.
The driving device is connected with the transmission device and is used for driving the transmission device to act. The driving device of this embodiment includes a guide rail 51 and a motor 52, in order to improve the control accuracy, the motor 52 is preferably a stepping motor 52, correspondingly, the bottom of the bracket 4 also has a base 42 capable of sliding along the guide rail 51, and an output shaft of the motor 52 is connected with the base 42.
Thus, when the motor 52 is started, the output shaft of the motor 52 drives the base 42 of the bracket 4 to move forward along the guide rail 51, so as to push the entire U-shaped bracket 4 to move upward, and the tail end of the bracket 4 drives the swing arm 313 of the clamping jaw 31 hinged with the bracket to move, so as to drive the movable clamping part 312 and the fixed clamping part 311 of the clamping jaw 31 to be tightly pressed; the direction driving motor 52 rotates, so that the movable grip portion 312 of the grip jaw 31 can be separated from the fixed grip portion 311.
The liquid receiving device 6 of this embodiment is arranged at the bottom of the stainless steel water tank 1, in order to ensure that water drops can be completely dripped into the liquid receiving device 6, the liquid receiving device 6 is a stainless steel basin body, the opening of the stainless steel basin body is larger than the bottom, and the inner surface of the stainless steel basin body is coated with a polytetrafluoroethylene hydrophobic coating, and the hydrophobic coating can enable the first dripped water to rapidly flow into the condensation sensing device 7 without being adhered to the wall of the liquid receiving device 6.
A proper distance is reserved between the liquid receiving device 6 and the bottom of the stainless steel water tank 1, when the distance between the liquid receiving device 6 and the stainless steel water tank 1 is too small, the liquid receiving device 6 can be affected by the temperature of the stainless steel water tank 1 to cool, condensation can be formed on the surface of the liquid receiving device 6, and the result is affected; when the distance between the two is too large, the water drops fall too long, so that a certain measurement error is caused. Therefore, in this embodiment, the distance between the liquid receiving means 6 and the bottom of the stainless steel water tank 1 is preferably set to 10 to 30cm.
A liquid drop port 61 is formed in the bottom of the liquid receiving device 6, the aperture of the liquid drop port 61 is too small, and water drops form capillary effect and cannot flow into the detection test paper 71; the area of the test paper 71, which may drop, becomes large due to the excessively large aperture, and the detection light spot of the photoelectric detection system needs to be large, which affects the accuracy of the result, and the embodiment preferably sets the aperture of the liquid drop port 61 to 1-2 cm.
The condensation induction device 7 is positioned below the liquid receiving device 6, and the upper opening end of the condensation induction device 7 is sealed with the lower part of the liquid receiving device 6 through welding. The condensation sensing device 7 is internally provided with a test paper 71 which can change color when meeting water, one side of the test paper 71 is provided with a light-emitting device 72 which can irradiate on the test paper 71, and the other side of the test paper 71 is provided with a sensing device 73 which can sense the color change of the test paper 71; in order to further improve the detection accuracy, a dehumidifier 74 is further provided in the condensation sensor 7.
Wherein the light emitting device 72 is an LED monochromatic light, and the LED monochromatic light is preferably an LED blue light or an LED red light; in order to better reflect the change of illumination intensity of the LED blue light lamp or the LED red light lamp irradiated on the test paper 71, the detection sensitivity is improved, and the test paper 71 is correspondingly cobalt chloride test paper. Here, the reference intensity of illumination in the anhydrous and watery state of the test paper is closely related to the color of the LED lamp (i.e., wavelength of light) and the type of test paper (different types of color change), wherein the color of the LED lamp is also selected according to the different color-changing test papers. The sensing device 73 may simply be a photoresistor, which cooperates with the LED light source to form a photodetection assembly.
The photoelectric detection circuit is used for recording the illumination intensity signal of the light emitting device 72 detected by the sensing device 73 after being reflected on the test paper 71 and the time when the illumination intensity signal changes. The photoelectric detection circuit can be implemented by adopting various functional circuits in the prior art, and the photoelectric detection circuit can preferably comprise the following functional modules:
a light emitting circuit A capable of emitting light of a fixed intensity;
the sensing circuit B is capable of detecting the light intensity emitted from the light emitting circuit a and reflected back through the test paper 71;
a power supply circuit F for supplying power to the light-emitting circuit A and the sensing circuit B;
the input end of the signal amplifying circuit C is connected with the output end of the sensing circuit B, and the signal amplifying circuit C detects the output signal of the sensing circuit B and amplifies the output signal;
the input end of the signal processing circuit D is connected with the output end of the signal amplifying circuit C, and the signal processing circuit D judges whether water exists on the test paper 71 according to the light intensity signal amplified by the signal amplifying circuit C; the signal processing circuit D further includes a control terminal connected to the power supply circuit F, and when the test paper 71 is judged to have water, the control terminal sends out a signal and causes the power supply circuit F to be powered off;
the timing device E comprises four nixie tubes which can be manually controlled to start and reset, wherein two nixie tubes represent hours, two nixie tubes represent minutes, and the timing device is connected with the output end of the signal processing circuit D and can display the time of the test paper from no water to water.
The specific circuits of the above functional modules of the photodetection circuit are in the prior art, and may be implemented by using a known circuit structure, which is not described herein.
As shown in fig. 5, a flowchart of a testing method implemented by the device for testing the anti-condensation coating effect of the stainless steel water tank 1 according to the present embodiment is shown, where the testing method includes the following steps:
(1) In order to achieve the constant temperature effect, a traditional circulating water bath mode can be adopted, but auxiliary equipment is needed, and the operation is complex; in the embodiment, the ice-water mixture 12 is preferably poured into the stainless steel water tank 1, the operation is simpler and more convenient, and the temperature in the stainless steel water tank 1 is controlled to be near the melting point of ice; in order to prevent overflow and cause detection interference, the liquid level of the ice-water mixture 12 in the stainless steel water tank 1 is lower than the highest point of the anti-condensation coating in the stainless steel water tank 1.
(2) Starting the light-emitting circuit in a dry state of the test paper, and recording a light intensity signal output by the detection signal amplifying circuit; repeating the steps for N times and taking an average value, wherein in order to improve the accuracy of the reference illuminance, the range of N is preferably not less than 20, and the reference illuminance P1 is recorded as the light intensity when the test paper is anhydrous.
(3) Starting a light-emitting circuit under the condition that the test paper is in a water state, and recording a light intensity signal output by a detection signal amplifying circuit; repeating the steps for N times and taking an average value, wherein in order to improve the accuracy of the reference illuminance, the range of N is preferably not less than 20, and the reference illuminance P2 is recorded as the light intensity when the test paper is water.
(4) Taking the fact that the test result is not necessarily just on the P1 or P2 numerical point, obtaining a light intensity reference illuminance intermediate value P '= (P1+P2)/2 of the test paper from water free state to water state change, and taking the intermediate value P' as a judgment standard;
(5) Starting a timing device, keeping the photoelectric detection circuit on, and controlling the starting and resetting of the timing device in a manual mode so as to facilitate flexible control; when water is left and drops onto the test paper, detecting a light intensity signal output by the signal amplifying circuit and transmitting the light intensity signal to the signal processing circuit, judging whether the current test paper has water or not by the signal processing circuit according to a light intensity reference illuminance intermediate value P ', and if the current light intensity illuminance is smaller than P', approaching to a water-free state, considering that the test paper is water-free, and circulating the step; if the current light intensity and illuminance are greater than or equal to P', the test paper is more similar to a water state, the test paper is considered to be water, the timing device stops timing, and the timing device displays the time T from the time when the test paper is not water to the time when the test paper is water. The time T is the initial dew point, namely the time when the first condensed water drops on the surface of the coating.
In the embodiment, the stainless steel water tank 1 product with the coating is directly used as a test carrier, the actual environment is simulated, and the comprehensive anti-condensation effect of the heat insulation performance and the water absorption and water hanging capacity of the coating is tested. The clamping of the stainless steel water tank 1 is realized through an automatic clamping system, and water falling caused by shaking is prevented. The test paper capable of immediately changing color when meeting water is adopted, and the change of the color of the test paper is detected through the photoelectric detection circuit to judge whether water drops, so that signal false alarm caused by dropping of coating particles can be avoided, and the test paper has stronger anti-interference capability and more accurate test results than the existing electronic balance device.
Claims (24)
1. The utility model provides a device of survey stainless steel water tank anti-condensation coating effect which characterized in that: the device comprises
The stainless steel water tank (1) is fixedly arranged in the constant temperature and humidity chamber (2), and an anti-condensation coating is coated in the stainless steel water tank (1);
the liquid receiving device (6) is arranged at the bottom of the stainless steel water tank (1), and a liquid dropping port (61) is formed at the bottom of the liquid receiving device (6);
the condensation sensing device (7) is positioned below the liquid receiving device (6), a test paper (71) capable of changing color when meeting water is arranged in the condensation sensing device (7), a light-emitting device (72) capable of irradiating the test paper (71) is arranged on one side of the test paper (71), and a sensing device (73) capable of sensing the color change of the test paper (71) is arranged on the other side of the test paper (71);
and the photoelectric detection circuit is used for recording the illumination intensity signal after the light of the light-emitting device (72) is reflected on the test paper (71) and the time for changing the illumination intensity signal, which are detected by the sensing device (73).
2. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the light emitting device (72) is an LED single-color lamp.
3. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 2, wherein: the LED single-color lamp is an LED blue lamp or an LED red lamp.
4. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 3, wherein: the test paper (71) is cobalt chloride test paper.
5. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the sensing device (73) is a photoresistor.
6. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the photoelectric detection circuit comprises
A light-emitting circuit (A) capable of emitting light of a fixed intensity;
the sensing circuit (B) can detect the light intensity emitted from the light-emitting circuit (A) and reflected back through the test paper (71);
a power supply circuit (F) for supplying power to the light-emitting circuit (A) and the induction circuit (B);
a detection signal amplifying circuit (C), the input end of which is connected with the output end of the sensing circuit (B), the detection signal amplifying circuit (C) detects the output signal of the sensing circuit (B) and amplifies the output signal;
the input end of the signal processing circuit (D) is connected with the output end of the detection signal amplifying circuit (C), and the signal processing circuit (D) judges whether water exists on the test paper (71) according to the light intensity signal amplified by the detection signal amplifying circuit (C); the signal processing circuit (D) further comprises a control end connected to the power supply circuit (F), and when the test paper (71) is judged to be water, the control end sends out a signal and enables the power supply circuit (F) to be powered off;
and a timer (E) connected to the output end of the signal processing circuit (D) for displaying the time elapsed from the absence of water to the presence of water of the test paper (71).
7. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 6, wherein: the timing device is a nixie tube which can be manually controlled to start and reset.
8. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the stainless steel water tank (1) is fixed in the constant temperature and humidity chamber (2) by an automatic clamping system, and the automatic clamping system comprises
The compressing device comprises a clamping jaw (31) for clamping the edge of the stainless steel water tank (1);
the transmission device is connected with the pressing device and is used for driving clamping jaws (31) of the pressing device to open and close;
and the driving device is connected with the transmission device and used for driving the transmission device to act.
9. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 8, wherein: the compacting device comprises at least two clamping jaws (31) which are arranged along the radial opposite direction of the notch of the stainless steel water tank (1), each clamping jaw (31) comprises a fixed clamping part (311) and a movable clamping part (312) which can be mutually matched for use, the fixed clamping parts (311) are fixedly arranged on the top end of the constant temperature and humidity chamber (2), the movable clamping parts (312) are positioned above the fixed clamping parts (311), the movable clamping parts (312) are further provided with swinging arms (313), the swinging arms (313) are hinged to a stand column (32), and the stand column (32) is fixedly arranged on the top end of the constant temperature and humidity chamber (2).
10. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 9, wherein: polyurethane cushion blocks are respectively arranged on the fixed clamping part (311) and the movable clamping part (312).
11. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 9, wherein: the clamping jaws (31) are four and are arranged around the edge of the stainless steel water tank (1) in a cross shape.
12. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 9, wherein: the transmission device is a bracket (4) arranged outside the constant temperature and humidity chamber (2), the cross section of the main body part of the bracket (4) is U-shaped, and the two ends of the U-shape of the bracket (4) are respectively hinged with the tail ends of swing arms (313) of the clamping jaws (31).
13. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 12, wherein: the support (4) is respectively provided with a reinforcing rib (41) at the U-shaped bending position.
14. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 12, wherein: the driving device comprises a guide rail (51) and a motor (52), correspondingly, the bottom of the bracket (4) is also provided with a base (42) which can slide along the guide rail (51), and an output shaft of the motor (52) is connected with the base (42).
15. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the liquid receiving device (6) is a stainless steel basin body, an opening of the stainless steel basin body is larger than the bottom, and the inner surface of the stainless steel basin body is coated with a hydrophobic coating.
16. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 15, wherein: the hydrophobic coating is a polytetrafluoroethylene coating.
17. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the distance between the liquid receiving device (6) and the bottom of the stainless steel water tank (1) is 10-30 cm.
18. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the aperture of a liquid dropping port (61) of the liquid receiving device (6) is 1-2 cm.
19. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: the lower part of the liquid receiving device (6) is welded and sealed with the upper opening end of the condensation induction device (7).
20. The apparatus for measuring the effect of a condensation-preventing coating of a stainless steel trough according to claim 1, wherein: a dehumidifier (74) is also arranged in the condensation sensing device (7).
21. A method for testing the effect of a condensation-proof coating of a stainless steel water tank, which adopts the device as set forth in claim 6, characterized in that the method for testing the effect of the condensation-proof coating of the stainless steel water tank (1) comprises the following steps:
(1) Pouring an ice-water mixture (12) into the stainless steel water tank (1), and controlling the temperature in the stainless steel water tank (1) to be near the melting point of ice;
(2) Starting a light-emitting circuit under the dry state of the test paper, and recording a light intensity signal output by the detection signal amplifying circuit; repeating the step N times and taking an average value, and recording as the light intensity reference illumination P1 when the test paper is anhydrous;
(3) Starting a light-emitting circuit under the condition that the test paper is in a water state, and recording a light intensity signal output by a detection signal amplifying circuit; repeating the step N times and taking an average value, and recording as the light intensity reference illumination P2 when the test paper is water;
(4) Obtaining a light intensity reference illuminance intermediate value P' = (P1+P2)/2 of the test paper from no water to water state change;
(5) Starting a timing device, keeping the photoelectric detection circuit on, detecting a light intensity signal output by the signal amplification circuit and transmitting the light intensity signal to the signal processing circuit when water is left and drops onto the test paper, judging whether the test paper is water or not by the signal processing circuit according to a light intensity reference illuminance intermediate value P ', and if the current light intensity illuminance is less than P', the test paper is anhydrous, and circulating the step; if the current light intensity and illuminance are greater than or equal to P', the test paper has water, the timing device stops timing, and the timing device displays the time from the test paper no water to the test paper having water.
22. The method for testing the anti-condensation coating effect of a stainless steel trough according to claim 21, wherein: the liquid level of the ice-water mixture (12) in the stainless steel water tank (1) is lower than the highest point of the anti-condensation coating in the stainless steel water tank (1).
23. The method for testing the anti-condensation coating effect of a stainless steel trough according to claim 21, wherein: and (3) in the steps (2) and (3), the range of N is more than or equal to 20.
24. The method for testing the anti-condensation coating effect of a stainless steel trough according to claim 21, wherein: the timing device is started and reset through manual control.
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| CN201811082929.8A CN110907437B (en) | 2018-09-17 | 2018-09-17 | Device and method for measuring condensation-preventing coating effect of stainless steel water tank |
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