On-line moisture detection device of drying machine

Abstract

The invention belongs to the technical field of moisture detection, and particularly relates to an online moisture detection device for a drying machine, which comprises a dew-point instrument, and the dew-point instrument comprises a detection cover body; an air inlet groove is formed in the detection cover body in a penetrating mode, a filtering assembly is installed between the air inlet groove and the dew point chamber, the filtering assembly comprises a filtering plate, a cover, a scraping strip, a filtering plate and a synchronous plate, and the filtering plate is made of a polytetrafluoroethylene material. When gas to be detected enters the gas inlet groove, the gas pushes the synchronous plate to move, the synchronous plate drives the connecting rod to slide along the limiting head, in the process, the cover moves along the filter plate, and at the moment, the gas to be detected enters the dew point chamber through the filter plate; the moisture in the detected gas can enter the dew point chamber together with the gas through the filter plate, so that the loss of the moisture in the gas is greatly reduced, and the influence on the accuracy of the dew point meter caused by moisture condensation lag due to absorption of the moisture in the gas is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of moisture detection, and in particular relates to an online moisture detection device for a dryer. Background Art

[0002] The moisture detection device of the dryer is an important device for real-time monitoring and controlling the moisture content of materials during the drying process. The moisture detection device mainly includes a dew point sensor, a pressure reducing valve and a flow meter. During the operation of the dryer, the dew point temperature of the gas is often detected by a dew point sensor, thereby indirectly measuring the humidity in the gas.

[0003] The dew point sensor uses a thermoelectric cooler (Peltier element) to cool the dew layer sensor, so that the water vapor in the gas condenses on the dew layer sensor to produce dew or frost. At the same time, the signal collected by the receiver is passed through the automatic control circuit to make the dew or frost on the dew layer sensor and the water vapor in the gas in a state of equilibrium. Then the temperature of the dew layer sensor, that is, the temperature of the dew or frost layer, is accurately measured with a thermometer to obtain the dew point temperature of the gas, and thus indirectly measure the humidity in the gas. The dew layer sensor includes components such as mirrors and light-emitting tubes, receiving tubes or surface acoustic wave devices.

[0004] Mirror contamination is one of the common problems in the operation of dew point sensors. It is mainly because the pollutants in the measured gas are particles that are insoluble in water (such as dust, etc.), which will increase the background scattering level of the mirror and cause zero drift of the photoelectric dew point meter. The more common solution is to use a filter device: before the measured gas enters the dew point chamber, use an appropriate filter device to remove solid particles and impurities, but the common filter device mainly uses filter cotton to filter solid particles and impurities from the air. At the same time, the filter cotton will absorb moisture in the air, causing the dew point sensor to condense and increase the measurement offset; there is also a situation of mirror contamination, that is, the measured gas contains water-soluble substances (such as soluble salts), these substances will condense on the mirror surface in advance, resulting in a positive deviation in the measurement result, that is, the Raoult effect; because common filter devices are difficult to effectively filter water-soluble substances, it is often necessary to manually clean the mirror surface. Manual cleaning of the mirror surface has the problem of scratching the lens, and the cleaning process is too cumbersome. Summary of the invention

[0005] The purpose of the present invention is to provide an online moisture detection device for a dryer in view of the deficiencies of the prior art, so as to solve the technical problems in the prior art.

[0006] The object of the present invention can be achieved by the following technical scheme: an online moisture detection device for a dryer, comprising an installation box and a pressure reducing valve, a dew point meter and a flow meter installed therein in sequence, and the pressure reducing valve, the dew point meter and the flow meter are connected by a pipeline; The dew point meter comprises a detection cover body and a detection upper cover and a heat sink respectively mounted on the top and the tail thereof, a cooling plate, a heat conducting structure and a thermometer are respectively mounted on the heat sink, a sealing ring is sleeved on the cooling plate, the heat conducting structure and the thermometer, the sealing ring is connected to the mirror, the thermometer and the cooling plate are connected to the control adapter plate, and a photoelectric detection device is mounted on the detection cover body; An air inlet groove is formed through the detection cover body, the air inlet groove is connected with the dew point chamber, a filter assembly is installed between the air inlet groove and the dew point chamber, the filter assembly includes a filter plate and a cover, a scraper strip on the cover is attached to the filter plate, a synchronization plate is installed on the filter plate, and the synchronization plate is located in the air inlet groove, and the filter plate is made of polytetrafluoroethylene material; A cleaning assembly is installed on the synchronous plate, and the cleaning assembly includes a push plate, a connecting rod is installed on the push plate, the connecting rod passes through the synchronous plate, the connecting rod is connected to the limit head, a pressure rod is rotatably installed on the limit head, a rotating shaft is rotatably installed inside the partition table, a pressure cylinder is fixedly installed on the rotating shaft, the pressure rod and the pressure cylinder are slidably matched, a double-port constant-pressure nozzle is installed on the pressure cylinder, and the double-port constant-pressure nozzle faces the mirror.

[0007] As a further optimization or improvement of this solution, guide bars and limit bars are installed in the air inlet groove, the synchronization plate and the guide bar are slidably matched, reinforcement rods are installed between the filter plates, a guide sleeve is installed on the cover, the guide sleeve fits the reinforcement rod, a partition table is installed in the detection cover body, and an ash collecting trough is opened on the partition table.

[0008] As a further optimization or improvement of the present scheme, a baffle plate is installed inside the pressurizing cylinder, which divides the pressurizing cylinder into a hot gas chamber and a liquid storage chamber. A double-headed piston is installed on the pressurizing rod, and the double-headed piston slides in the liquid storage chamber and the hot gas chamber respectively. A heating wire is installed on the side wall of the hot gas chamber, and a liquid filling port is installed on the liquid storage chamber.

[0009] As a further optimization or improvement of the present solution, a telescopic head is installed on the connecting rod, a slot is provided inside the limiting head, and the telescopic head is engaged with the slot.

[0010] As a further optimization or improvement of this solution, a return spring is installed between the push plate and the synchronization plate.

[0011] As a further optimization or improvement of this solution, the refrigeration plate and the thermometer are connected to the control adapter plate through an electrical needle, and a heat sink tail cover is installed at the bottom of the heat sink, and the heat sink tail cover seals the control adapter plate inside the heat sink.

[0012] As a further optimization or improvement of the present solution, an air inlet and an air outlet are installed on the installation box, and the air inlet and the air outlet are respectively connected to a pressure reducing valve and a flow meter through pipelines.

[0013] Beneficial effects of the present invention: (1) When the measured gas in the present invention enters the air inlet slot, the measured gas pushes the synchronous plate to move, and the synchronous plate drives the connecting rod to slide along the limit head while moving. During this process, the cover on the synchronous plate moves synchronously with the synchronous plate, so that the cover moves along the filter plate. At this time, the measured gas enters the dew point chamber through the filter plate. Since the polytetrafluoroethylene material on the filter plate has a strong water-repellent property, the moisture in the measured gas can enter the dew point chamber together with the gas through the filter plate, which greatly reduces the loss of moisture in the gas and avoids the absorption of moisture in the gas to cause condensation lag, thereby affecting the accuracy of the dew point meter.

[0014] (2) When the measured gas in the present invention enters the air inlet groove, the measured gas first pushes the push plate and the connecting rod to move. When the connecting rod moves, it drives the pressure rod to push into the pressure cylinder. At the same time, the pressure cylinder drives the rotating shaft to rotate. During the process of the pressure rod pushing into the inside of the pressure cylinder, the pressure rod compresses the gas inside the liquid storage chamber and the hot air chamber through the double-headed piston. As the gas inside the liquid storage chamber and the hot air chamber increases, the alcohol filled in the liquid storage chamber is first sprayed onto the mirror surface through the double-mouth constant pressure nozzle, and then the heated gas inside the hot air chamber is blown out through the double-mouth constant pressure nozzle. The gas accelerates the volatilization of the alcohol on the mirror surface, thereby cleaning the water-soluble substances on the mirror surface.

[0015] Specifically, when the connecting rod drives the pressure rod to push into the pressure cylinder, the pressure cylinder will drive the rotating shaft to rotate. At the same time, alcohol will be evenly sprayed on the mirror surface through the double-mouth constant pressure nozzle to improve the dissolution efficiency of alcohol on water-soluble substances. In the process of cleaning water-soluble substances on the mirror surface, the cover is in the state of blocking the filter plate, and the measured gas cannot enter the dew point chamber to affect the cleaning of water-soluble substances.

[0016] (3) When the present invention is in use, if the pressure of the measured gas fluctuates slightly, the pressure reducing valve can help to avoid pressure fluctuations entering the dew point chamber to a certain extent, and to avoid the influence of pressure fluctuations on the measurement accuracy of the dew point meter to a certain extent; if the pressure of the measured gas fluctuates greatly, such as the pressure of the measured gas increases greatly, the gas entering the air inlet slot will first further push the push plate and the synchronous plate to move synchronously, and the cover will move synchronously with the synchronous plate. In this process, the opening amplitude of the dew point chamber increases, and the unit amount of the measured gas entering the dew point chamber increases accordingly, which effectively balances the pressure of the measured gas inside the dew point chamber and greatly reduces the influence of pressure fluctuations on the measurement accuracy of the dew point meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is an exploded diagram of the overall structure of the dew point meter.

[0020] Figure 3 This is the front view of the overall structure of the dew point meter.

[0021] Figure 4 Schematic diagram of the internal structure of the dew point meter.

[0022] Figure 5 Schematic diagram of the internal structure of the detection cover.

[0023] Figure 6 Schematic diagram of the installation location of the filtering component and the cleaning component.

[0024] Figure 7 for Figure 6 A magnified view of the structure of part A.

[0025] Figure 8 Schematic diagram of the cover and filter plate structure.

[0026] Fig. 9 This is a schematic diagram of the bottom structure.

[0027] Fig.10 This is a schematic diagram of the overall structure of the cleaning component.

[0028] Fig.11 Schematic diagram of the connection between the connecting rod and the limit head.

[0029] The following are marked in the figure: 1. Installation box; 2. Dew point meter; 201. Detection cover; 202. Photoelectric detection device; 203. Detection cover; 204. Sealing ring; 205. Mirror; 206. Heat conduction structure; 207. Thermometer; 208. Refrigeration plate; 209. Heat sink; 210. Heat sink tail cover; 211. Air inlet slot; 212. Control adapter plate; 213. Electrical needle; 214. Dew point chamber; 215. Divider; 216. Ash collecting slot; 3. Filter assembly; 301. Reinforcement rod; 302. Filter plate; 303. Cover; 304. Guide sleeve ; 305, scraper strip; 306, synchronization plate; 307, limit strip; 308, guide strip; 4, cleaning assembly; 401, push plate; 402, reset spring; 403, connecting rod; 404, limit head; 405, pressure rod; 406, pressure cylinder; 407, rotating shaft; 408, double-port constant pressure nozzle; 409, double-headed piston; 410, liquid storage chamber; 411, hot air chamber; 412, baffle plate; 413, liquid filling port; 414, heating wire; 415, slot; 416, telescopic head; 5, pressure reducing valve; 6, flow meter; 7, air inlet; 8, air outlet. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 11 , an online moisture detection device for a dryer, comprising an installation box 1 and a pressure reducing valve 5, a dew point meter 2 and a flow meter 6 sequentially installed inside the installation box, and the pressure reducing valve 5, the dew point meter 2 and the flow meter 6 are connected by a pipeline; The dew point meter 2 comprises a detection cover 203 and a detection upper cover 201 and a heat sink 209 respectively mounted on the top and the tail thereof, a cooling plate 208, a heat conducting structure 206 and a thermometer 207 are respectively mounted on the heat sink 209, a sealing ring 204 is sleeved on the cooling plate 208, the heat conducting structure 206 and the thermometer 207, the sealing ring 204 is connected to the mirror 205, the thermometer 207 and the cooling plate 208 are connected to the control adapter plate 212, and a photoelectric detection device 202 is mounted on the detection cover 203; An air inlet groove 211 is formed through the detection cover 203, and the air inlet groove 211 is connected to the dew point chamber 214. A filter assembly 3 is installed between the air inlet groove 211 and the dew point chamber 214. The filter assembly 3 includes a filter plate 302 and a cover 303. A scraper strip 305 on the cover 303 fits the filter plate 302. A synchronization plate 306 is installed on the filter plate 302, and the synchronization plate 306 is located in the air inlet groove 211. The filter plate 302 is made of polytetrafluoroethylene material. The cleaning assembly 4 is installed on the synchronous plate 306, and the cleaning assembly 4 includes a push plate 401. A connecting rod 403 is installed on the push plate 401, and the connecting rod 403 penetrates the synchronous plate 306. The connecting rod 403 is connected to the limit head 404. A pressure rod 405 is rotatably installed on the limit head 404. A rotating shaft 407 is rotatably installed inside the partition table 215. A pressure cylinder 406 is fixedly installed on the rotating shaft 407. The pressure rod 405 is slidably matched with the pressure cylinder 406. A double-port constant-pressure nozzle 408 is installed on the pressure cylinder 406, and the double-port constant-pressure nozzle 408 faces the mirror 205.

[0032] Specifically, a baffle plate 412 is installed inside the pressurizing cylinder 406, and the baffle plate 412 divides the pressurizing cylinder 406 into a hot air chamber 411 and a liquid storage chamber 410. A double-headed piston 409 is installed on the pressurizing rod 405, and the double-headed piston 409 slides in the liquid storage chamber 410 and the hot air chamber 411 respectively. A heating wire 414 is installed on the side wall of the hot air chamber 411, and a liquid filling port 413 is installed on the liquid storage chamber 410.

[0033] Specifically, the connecting rod 403 is provided with a telescopic head 416 , and a slot 415 is provided inside the limiting head 404 , and the telescopic head 416 is engaged with the slot 415 .

[0034] Specifically, a return spring 402 is installed between the push plate 401 and the synchronization plate 306 .

[0035] It should be noted that, in the initial state, that is, before the measured gas enters the dew point meter 2, Figure 7 and Figure 8 As shown, the cover 303 is located above the filter plate 302 and overlaps with the filter plate 302. The cover 303 blocks the filter plate 302, and the measured gas cannot enter the dew point chamber 214. The barrier plate 412 is made of thermal insulation material to prevent the heat of the hot gas cavity 411 from being transferred to the inside of the liquid storage cavity 410, causing the alcohol in the liquid storage cavity 410 to volatilize.

[0036] It should be noted that the filter material of the filter plate 302 is polytetrafluoroethylene, which has a very low surface tension, only half of that of water, and an angle of 102 degrees with water, so it has a strong water repellency. When the measured gas passes through the filter plate 302, the filter plate 302 filters the water-insoluble particles in the gas. Since the filter plate 302 has a strong water repellency, the moisture in the gas can pass through the filter plate 302 and enter the dew point chamber 214 together with the gas, greatly reducing the loss of moisture in the gas, avoiding the absorption of moisture in the gas to cause condensation lag, and thus affecting the accuracy of the dew point meter 2.

[0037] When cleaning the water-soluble substances on the mirror surface 205, the measured gas enters the dew point meter 2 through the air inlet groove 211, and the measured gas is adjusted to a slow flow state through the pressure reducing valve 5. Since the cover 303 blocks the filter plate 302, see Figure 7 The measured gas entering the air inlet groove 211 first pushes the push plate 401 and the connecting rod 403 to move. At this time, the return spring 402 is compressed. The connecting rod 403 moves and drives the pressurizing rod 405 to push into the pressurizing cylinder 406. At the same time, the pressurizing cylinder 406 drives the rotating shaft 407 to rotate. Fig.10As shown, during the process of the pressurizing rod 405 pushing the pressurizing cylinder 406, the pressurizing rod 405 compresses the gas inside the liquid storage chamber 410 and the hot air chamber 411 through the double-headed piston 409. As the gas inside the liquid storage chamber 410 and the hot air chamber 411 increases, the alcohol added inside the liquid storage chamber 410 is first sprayed on the mirror surface 205 through the double-mouth constant pressure nozzle 408, and then the gas heated inside the hot air chamber 411 is blown out through the double-mouth constant pressure nozzle 408. The gas accelerates the volatilization of the alcohol on the mirror surface 205, thereby cleaning the water-soluble substances on the mirror surface 205. During the process of the connecting rod 403 driving the pressurizing rod 405 to push the pressurizing cylinder 406, the pressurizing cylinder 406 will drive the rotating shaft 407 to rotate. At the same time, the alcohol will be evenly sprayed on the mirror surface 205 through the double-mouth constant pressure nozzle 408, thereby improving the dissolution efficiency of the alcohol on the water-soluble substances. During the process of cleaning the water-soluble substances on the mirror surface 205 , the cover 303 is in a state of blocking the filter plate 302 , and the measured gas cannot enter the dew point chamber 214 to affect the cleaning of the water-soluble substances.

[0038] If the pressure of the measured gas fluctuates slightly, the pressure reducing valve 5 can help to avoid pressure fluctuations entering the dew point chamber 214 to a certain extent, and to avoid the influence of pressure fluctuations on the measurement accuracy of the dew point meter 2 to a certain extent; if the pressure of the measured gas fluctuates greatly, such as the pressure of the measured gas increases greatly, the gas entering the air inlet groove 211 will first further push the push plate 401 and the synchronous plate 306 to move synchronously, and the cover 303 moves synchronously with the synchronous plate 306. In this process, the opening amplitude of the dew point chamber 214 increases, and the unit amount of the measured gas entering the dew point chamber 214 increases, which effectively balances the pressure of the measured gas inside the dew point chamber 214 and greatly reduces the influence of pressure fluctuations on the measurement accuracy of the dew point meter 2; if the pressure of the measured gas decreases greatly, the same applies.

[0039] See also Figure 7 A guide bar 308 and a limit bar 307 are installed in the air inlet groove 211, and the synchronous plate 306 is slidably matched with the guide bar 308. A reinforcing rod 301 is installed between the filter plates 302, and a guide sleeve 304 is installed on the cover 303. The guide sleeve 304 fits the reinforcing rod 301. A partition table 215 is installed in the detection cover body 203, and an ash collecting groove 216 is opened on the partition table 215.

[0040] It should be noted that a spring is installed between the synchronization plate 306 and the limit bar 307 to ensure that the synchronization plate 306 can be reset when the dew point meter 2 is closed and the measured gas stops supplying to the inside of the air inlet groove 211. The reinforcing rod 301 plays the role of reinforcing the filter plate 302 and improving the strength of the filter plate 302. The connecting head of the reinforcing rod 301 and the filter plate 302 is a columnar setting, and a collection groove is provided inside. When the synchronization plate 306 is reset, the guide sleeve 304 and the scraper strip 305 on the cover 303 can push the debris particles on the reinforcing rod 301 and the filter plate 302 into the collection groove and collect them.

[0041] See also Figure 4 The cooling plate 208 and the thermometer 207 are connected to the control adapter plate 212 through the electrical needle 213 , and a heat dissipation tail cover 210 is installed at the bottom of the heat dissipation seat 209 , and the heat dissipation tail cover 210 seals the control adapter plate 212 inside the heat dissipation seat 209 .

[0042] Specifically, the installation box 1 is provided with an air inlet 7 and an air outlet 8 , and the air inlet 7 and the air outlet 8 are respectively connected to the pressure reducing valve 5 and the flow meter 6 through pipelines.

[0043] It should be noted that when the present invention is used, the air inlet 7 is connected to the measured gas, and the gas passes through the pressure reducing valve 5, the dew point meter 2 and the flow meter 6 respectively, and then the gas is discharged from the air outlet 8. When the measured gas enters the dew point meter 2 through the air inlet groove 211, the measured gas is adjusted to a slow flow state through the pressure reducing valve 5, and the water-soluble substances on the mirror surface 205 are cleaned by the cleaning component 4; after the water-soluble substances are cleaned, the measured gas is adjusted to a normal flow state through the pressure reducing valve 5, so that the measured gas passes through the dew point chamber 214 normally.

[0044] The above-mentioned pressure reducing valve 5, dew point meter 2 and flow meter 6 are all prior art, and the working principles of the pressure reducing valve 5, dew point meter 2 and flow meter 6 will not be described in detail in the present invention.

[0045] The implementation principle of the present invention is as follows: when in use, the air inlet 7 is connected to the measured gas, and the gas passes through the pressure reducing valve 5, the dew point meter 2 and the flow meter 6 respectively, and then the gas is discharged from the air outlet 8. When the measured gas enters the dew point meter 2 through the air inlet groove 211, the measured gas is adjusted to a slow flow state through the pressure reducing valve 5, and the filter plate 302 is blocked by the cover 303, see Figure 7 The measured gas entering the air inlet groove 211 first pushes the push plate 401 and the connecting rod 403 to move. At this time, the return spring 402 is compressed. The connecting rod 403 moves and drives the pressurizing rod 405 to push into the pressurizing cylinder 406. At the same time, the pressurizing cylinder 406 drives the rotating shaft 407 to rotate. Fig.10As shown, during the process of the pressurizing rod 405 pushing the pressurizing cylinder 406, the pressurizing rod 405 compresses the gas inside the liquid storage chamber 410 and the hot air chamber 411 through the double-headed piston 409. As the gas inside the liquid storage chamber 410 and the hot air chamber 411 increases, the alcohol added inside the liquid storage chamber 410 is first sprayed on the mirror surface 205 through the double-mouth constant pressure nozzle 408, and then the gas heated inside the hot air chamber 411 is blown out through the double-mouth constant pressure nozzle 408. The gas accelerates the volatilization of the alcohol on the mirror surface 205, thereby cleaning the water-soluble substances on the mirror surface 205. During the process of the connecting rod 403 driving the pressurizing rod 405 to push the pressurizing cylinder 406, the pressurizing cylinder 406 will drive the rotating shaft 407 to rotate. At the same time, the alcohol will be evenly sprayed on the mirror surface 205 through the double-mouth constant pressure nozzle 408, thereby improving the dissolution efficiency of the alcohol on the water-soluble substances.

[0046] The measured gas is adjusted to a normal flow state through the pressure reducing valve 5. At this time, the measured gas pushes the push plate 401 and the synchronous plate 306 to move at the same time, and the telescopic head 416 on the connecting rod 403 is separated from the card slot 415 inside the limit head 404. The synchronous plate 306 moves while driving the connecting rod 403 to slide along the limit head 404. In this process, the cover 303 on the synchronous plate 306 moves synchronously with the synchronous plate 306, so that the cover 303 moves along the filter plate 302. At this time, the measured gas passes through the filter plate 302 and enters the dew point chamber 214. Since the polytetrafluoroethylene material on the filter plate 302 has a strong water-repellent property, the moisture in the measured gas can pass through the filter plate 302 together with the gas and enter the dew point chamber 214, which greatly reduces the loss of moisture in the gas and avoids the absorption of moisture in the gas to cause condensation lag, thereby affecting the accuracy of the dew point meter 2. When the cover 303 moves along the filter plate 302, the guide sleeve 304 and the scraper strip 305 on the cover 303 scrape off the debris particles on the reinforcing rod 301 and the filter plate 302 respectively. As the cover 303 moves, the debris particles scraped off by the guide sleeve 304 and the scraper strip 305 enter the ash collecting groove 216 for collection.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An online moisture detection device for a dryer, characterized in that: It comprises an installation box (1) and a pressure reducing valve (5), a dew point meter (2) and a flow meter (6) which are sequentially installed inside the installation box, and the pressure reducing valve (5), the dew point meter (2) and the flow meter (6) are connected by a pipeline; The dew point meter (2) comprises a detection cover (203) and a detection upper cover (201) and a heat sink (209) respectively mounted on the top and the rear of the detection cover; a cooling plate (208), a heat conducting structure (206) and a thermometer (207) are respectively mounted on the heat sink (209); a sealing ring (204) is sleeved on the cooling plate (208), the heat conducting structure (206) and the thermometer (207); the sealing ring (204) is connected to the mirror surface (205); the thermometer (207) and the cooling plate (208) are connected to the control adapter plate (212); and a photoelectric detection device (202) is mounted on the detection cover (203); An air inlet groove (211) is formed through the detection cover body (203), the air inlet groove (211) is in communication with the dew point chamber (214), a filter assembly (3) is installed between the air inlet groove (211) and the dew point chamber (214), the filter assembly (3) comprises a filter plate (302) and a cover (303), a scraper strip (305) on the cover (303) is attached to the filter plate (302), a synchronization plate (306) is installed on the filter plate (302), and the synchronization plate (306) is located in the air inlet groove (211), and the filter plate (302) is made of polytetrafluoroethylene material; A cleaning assembly (4) is installed on the synchronous plate (306), and the cleaning assembly (4) includes a push plate (401). A connecting rod (403) is installed on the push plate (401), and the connecting rod (403) passes through the synchronous plate (306). The connecting rod (403) is connected to a limit head (404), and a pressure rod (405) is rotatably installed on the limit head (404). A rotating shaft (407) is rotatably installed inside the partition table (215), and a pressure cylinder (406) is fixedly installed on the rotating shaft (407). The pressure rod (405) and the pressure cylinder (406) are slidably matched, and a double-port constant-pressure nozzle (408) is installed on the pressure cylinder (406), and the double-port constant-pressure nozzle (408) faces the mirror surface (205).

2. The on-line moisture detection device for a dryer according to claim 1, characterized in that: A guide bar (308) and a limit bar (307) are installed in the air inlet groove (211), the synchronous plate (306) and the guide bar (308) are slidably matched, a reinforcing rod (301) is installed between the filter plates (302), a guide sleeve (304) is installed on the cover (303), the guide sleeve (304) is in contact with the reinforcing rod (301), a partition table (215) is installed in the detection cover body (203), and an ash collecting groove (216) is provided on the partition table (215).

3. The on-line moisture detection device for a dryer according to claim 1, characterized in that: A baffle plate (412) is installed inside the pressurizing cylinder (406), and the baffle plate (412) divides the pressurizing cylinder (406) into a hot air chamber (411) and a liquid storage chamber (410). A double-headed piston (409) is installed on the pressurizing rod (405), and the double-headed piston (409) is respectively located in the liquid storage chamber (410) and the hot air chamber (411) for sliding. A heating wire (414) is installed on the side wall of the hot air chamber (411), and a liquid filling port (413) is installed on the liquid storage chamber (410).

4. The on-line moisture detection device for a dryer according to claim 1, characterized in that: The connecting rod (403) is provided with a telescopic head (416), a slot (415) is provided inside the limiting head (404), and the telescopic head (416) is engaged with the slot (415).

5. The on-line moisture detection device for a dryer according to claim 1, characterized in that: A return spring (402) is installed between the push plate (401) and the synchronizing plate (306).

6. The on-line moisture detection device for a dryer according to claim 1, characterized in that: The cooling plate (208) and the thermometer (207) are connected to the control adapter plate (212) via an electrical pin (213); a heat dissipation tail cover (210) is installed at the bottom of the heat dissipation seat (209); and the heat dissipation tail cover (210) seals the control adapter plate (212) inside the heat dissipation seat (209).

7. The on-line moisture detection device for a dryer according to claim 1, characterized in that: An air inlet (7) and an air outlet (8) are installed on the installation box (1), and the air inlet (7) and the air outlet (8) are respectively connected to a pressure reducing valve (5) and a flow meter (6) through pipelines.

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