Online dehydration detection device and papermaking vacuum system

Abstract

The invention discloses an online dehydration detection device and a papermaking vacuum system, and relates to the technical field of papermaking equipment, the online dehydration detection device comprises a vacuum box and a detection assembly, the detection assembly is arranged on one side of the vacuum box, and the detection assembly comprises an outer box body, a water inlet, a water outlet, an access hole, an observation window, a differential pressure type liquid level transmitter, a guide plate, a weir plate cylinder and an overflow port; one side of the vacuum box is connected with an outer box body through a pipeline, the upper portion of the outer box body is provided with a water inlet, the lower portion of the outer box body is provided with a water outlet, one side of the outer box body is provided with an access hole, the other side of the outer box body is provided with an observation window, and the outer box body is provided with a differential pressure type liquid level transmitter below the observation window. And a guide plate is connected to one side of the water inlet in the outer box body. When the device is used, the dewatering amount can be accurately and conveniently detected in real time, the dewatering process is controlled, energy conservation and consumption reduction are achieved, the device can be synchronously cleaned during detection, and the air suction amount is automatically adjusted to a certain degree.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking equipment, in particular to an online dehydration detection device and a papermaking vacuum system. Background Art

[0002] In the papermaking process, accurate monitoring of dehydration is crucial to controlling paper quality and production efficiency. Detection devices are usually installed in key locations such as vacuum suction boxes and vacuum pressing rollers to accurately reflect the dehydration status of paper at different stages.

[0003] At present, there are three common online dehydration detection technologies: microwave measurement technology, which has the advantages of non-contact measurement, fast response speed, and high measurement accuracy. Its disadvantages are high cost, certain requirements for installation location and installation space, and it is not suitable for most paper machine vacuum systems; resistive measurement technology, which has the advantages of relatively low cost and easy installation. Its disadvantage is that its measurement accuracy is affected by factors such as paper temperature and impurities; infrared measurement technology, which is suitable for dehydration detection of thinner paper and has better adaptability to temperature changes.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and an online dehydration detection device and a papermaking vacuum system are proposed. Summary of the invention

[0005] The object of the present invention is to provide an online dehydration detection device and a papermaking vacuum system to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an online dehydration detection device, comprising a vacuum box and a detection component, a detection component is arranged on one side of the vacuum box, the detection component comprises an outer box body, a water inlet, a water outlet, an inspection port, an observation window, a differential pressure liquid level transmitter, a guide plate, a weir plate tube and an overflow port, one side of the vacuum box is connected to the outer box body through a pipeline, and a water inlet is arranged on the upper part of the outer box body, a water outlet is arranged on the lower part of the outer box body, an inspection port is arranged on one side of the outer box body, and an observation window is arranged on the other side of the outer box body, a differential pressure liquid level transmitter is arranged on the outer box body below the observation window, and a guide plate is connected to the water inlet side of the outer box body, a weir plate tube is connected to the water outlet side of the outer box body, and an overflow port is opened on the side of the weir plate tube close to the observation window.

[0007] Furthermore, the water inlet is connected to the interior of the vacuum box through a pipeline, the guide plate is obliquely distributed in the outer box body, the overflow port is trapezoidal, and the liquid level height in the outer box body is proportional to the flow rate flowing through the overflow port.

[0008] Furthermore, a cleaning assembly is arranged on the outside of the weir tube, and the cleaning assembly includes a surrounding plate and a mounting groove. A surrounding plate is arranged on the outside of the weir tube, and a mounting groove is opened on the surface of the surrounding plate. There are four mounting grooves equidistantly distributed on the surrounding plate.

[0009] Furthermore, the cleaning component also includes a card cavity, a card slot and a mounting rod, the card cavities are symmetrically opened on both sides of the mounting slot, and a card slot is opened on one side of the card cavity, and the mounting rod is snap-connected in the mounting slot.

[0010] Furthermore, the cleaning assembly also includes a clamping spring, a clamping rod and a clamping block. A clamping spring is connected in the clamping cavity, and one end of the clamping spring is connected to the clamping rod, one side of the clamping rod is connected to the clamping block, and the clamping block is slidably connected to the enclosure through a clamping groove, the clamping rod is elastically connected to the clamping cavity through the clamping spring, and the clamping rod is clamped and slidably connected to the enclosure through the clamping cavity.

[0011] Furthermore, the cleaning assembly also includes a bayonet and a scraper. The bayonet is symmetrically provided on both sides of the mounting rod, and scrapers are connected to both ends of the mounting rod. The connecting rod is connected to the mounting rod through the bayonet, and the scrapers are respectively attached to the inner wall of the outer box body and the outer wall of the weir tube.

[0012] Furthermore, support rods are symmetrically connected to the four corners of the enclosure, and the other end of the support rods is connected to a connecting frame, one side of the connecting frame is connected to a gear rod, and one side of the gear rod is connected to a double-linked wheel.

[0013] Furthermore, feed ports are provided on both sides of the vacuum box, and a partition net is provided between the feed ports, a drain port is provided on the lower side of the vacuum box, and an air extraction port is provided on the rear side of the vacuum box, and a baffle is connected to one side of the air extraction port.

[0014] Furthermore, an exhaust hood is connected to the other side of the exhaust port, and a sealing groove is provided in the middle of the exhaust hood. A sealing plate is slidably engaged in the sealing groove, and a rack is connected to one side of the sealing plate. The rack and the rack rod are both engaged with the double-linked wheels, and the rack and the rack rod are located on the same side of the double-linked wheels.

[0015] Furthermore, the papermaking vacuum system comprises the following steps:

[0016] S1: Send the material into the vacuum box from the feed port, and start the external vacuum pump to dehydrate the material;

[0017] S2: Water gathers in the vacuum box and enters the outer box from the water inlet through the drain port through the pipe;

[0018] S3: Under the guidance of the guide plate, water gathers outside the weir tube and forms a certain liquid level in the outer box, and flows into the inner side of the weir tube through the overflow port and then flows out of the outer box from the outlet;

[0019] S4: The differential pressure level transmitter detects the liquid level and transmits the data to the control room, thereby controlling the production line and regulating the dehydration process.

[0020] The present invention provides an online dehydration detection device and a papermaking vacuum system, which have the following beneficial effects: when in use, the dehydration amount can be accurately and conveniently detected in real time, and the dehydration process can be controlled to achieve energy saving and consumption reduction, and the device can be cleaned synchronously during detection, and the air extraction volume can be automatically adjusted to a certain extent.

[0021] 1. When the present invention is in use, the water removed by vacuum enters the outer box body through the water inlet, and then reaches the bottom of the outer box body under the guidance of the guide plate, and forms a certain liquid level height on the outside of the weir plate tube. Since the trapezoidal overflow port on the weir plate tube is calibrated by flow rate, the liquid level height is proportional to the flow rate flowing through it. The liquid level height is detected by a differential pressure liquid level transmitter and transmitted to the control room, so that the real-time flow data of each vacuum point of the paper machine can be remotely displayed. During the detection process, the situation inside the outer box body can be observed through the observation window to determine whether to clean and maintain the inside of the outer box body from the inspection port. Compared with the traditional detection method, the detection method has a simple structure, low cost, high reliability, and is suitable for all paper machines and paper types. It can detect the dehydration amount of all vacuum points of the paper machine in real time, which is conducive to adjusting the vacuum of each point, accurately controlling the dehydration process, reducing unnecessary vacuum energy consumption, and achieving energy saving and consumption reduction. In summary, when in use, the dehydration amount can be accurately and conveniently detected in real time, and the dehydration process can be controlled to achieve energy saving and consumption reduction.

[0022] 2. During the inspection of the present invention, after the water removed by vacuum accumulates in the outer box, the enclosure will remain floating above the liquid surface due to buoyancy and move in the outer box as the liquid level changes. When the enclosure moves, it can drive the scraper to move synchronously through the mounting rod to scrape and clean the stains adhering to the inner wall of the outer box and the outer wall of the weir tube. When the scraper needs to be maintained and replaced, the inspection port is opened and the card block is slid in the card slot, which can drive the card rod to slide in the card cavity and compress the card spring, thereby pulling the card rod out of the card port. , release the restriction on the mounting rod. At this time, the scraper and the mounting rod can be removed from the enclosure and taken out from the inspection port. During installation, align the mounting rod with the mounting slot and lower it, so that the mounting rod can be pressed into the card cavity through the inclined surface on the clamping rod. After the mounting rod is completely inserted into the mounting slot, the clamping rod can rebound and be inserted into the bayonet under the action of the clamping spring to fix the mounting rod and complete the installation of the scraper. In summary, during use, the inner wall of the outer box body and the outer wall of the weir tube can be cleaned synchronously, and the scraper can be disassembled and replaced conveniently.

[0023] 3. When the present invention is in use, after the material enters the vacuum box from the feed port, the partition net can receive the material, and under the action of the external vacuum pump, the air in the vacuum box is extracted to form a negative pressure, thereby extracting the moisture in the material, and the partition net can prevent the material from falling, and the escaped water can flow into the water inlet from the drain port through the pipe, and as the liquid level in the outer box body changes, the enclosure plate is driven to move, and the connecting frame also moves synchronously with the enclosure plate through the support rod, thereby driving the gear rod to move, and then the double-linked wheel drives the sealing plate to move in the sealing groove through the rack, and the opening area of ​​the vacuum hood is adjusted, so that the air flow rate passing through the vacuum port is adjusted, and the auxiliary operation room is synchronously adjusted to the dehydration amount. In summary, when in use, the air flow rate can be automatically adjusted, thereby assisting in regulating the dehydration amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a half-cut three-dimensional exploded structure of a detection component of an online dehydration detection device of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall cross-sectional three-dimensional structure of an online dehydration detection device of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall cross-sectional front view structure of an online dehydration detection device of the present invention;

[0027] Figure 4 It is a schematic diagram of the overall three-dimensional structure of an online dehydration detection device of the present invention;

[0028] Figure 5 It is a schematic diagram of a half-section top view of the enclosure of an online dehydration detection device of the present invention;

[0029] Figure 6 It is a schematic diagram of the three-dimensional exploded structure of an exhaust hood of an online dehydration detection device of the present invention;

[0030] Figure 7 It is a schematic diagram of a half-sectioned three-dimensional exploded structure of a vacuum box of an online dehydration detection device of the present invention.

[0031] In the figure: 1. vacuum box; 2. detection component; 201. outer box body; 202. water inlet; 203. water outlet; 204. inspection port; 205. observation window; 206. differential pressure level transmitter; 207. guide plate; 208. weir plate tube; 209. overflow port; 3. cleaning component; 301. enclosure; 302. mounting groove; 303. clamping cavity; 304. clamping groove; 305. mounting rod; 306. clamping spring; 307. clamping rod; 308. clamping block; 309. clamping port; 310. scraper; 4. support rod; 5. connecting frame; 6. gear rod; 7. double wheel; 8. feed port; 9. partition net; 10. drain outlet; 11. exhaust port; 12. baffle; 13. exhaust hood; 14. sealing groove; 15. sealing plate; 16. rack. DETAILED DESCRIPTION

[0032] See also Figures 1 to 7 The present invention provides a technical solution: an online dehydration detection device and a papermaking vacuum system, comprising a vacuum box 1 and a detection component 2, wherein the detection component 2 is arranged on one side of the vacuum box 1, and the detection component 2 comprises an outer box body 201, a water inlet 202, a water outlet 203, an inspection port 204, an observation window 205, a differential pressure liquid level transmitter 206, a guide plate 207, a weir plate tube 208 and an overflow port 209, and one side of the vacuum box 1 is connected to the outer box body 201 through a pipeline, and the upper part of the outer box body 201 is provided with a water inlet 202. A water outlet 203 is provided at the lower part of the outer box body 201, an inspection port 204 is provided on one side of the outer box body 201, and an observation window 205 is provided on the other side of the outer box body 201, a differential pressure liquid level transmitter 206 is provided below the observation window 205 of the outer box body 201, and a guide plate 207 is connected to the water inlet 202 side of the outer box body 201, a weir plate tube 208 is connected to the water outlet 203 side of the outer box body 201, and an overflow port 209 is opened on the side of the weir plate tube 208 close to the observation window 205.

[0033] See also Figures 1 to 4 , the water inlet 202 is connected to the inside of the vacuum box 1 through a pipeline, the guide plate 207 is obliquely distributed in the outer box body 201, the overflow port 209 is trapezoidal, and the liquid level in the outer box body 201 is proportional to the flow rate flowing through the overflow port 209;

[0034] The specific operation is as follows. When in use, the water removed by vacuum enters the outer box 201 from the water inlet 202, and then reaches the bottom of the outer box 201 under the guidance of the guide plate 207, and forms a certain liquid level height outside the weir plate tube 208. Since the trapezoidal overflow port 209 on the weir plate tube 208 is calibrated for flow, the liquid level height is proportional to the flow rate flowing through it. The liquid level height is detected by the differential pressure liquid level transmitter 206 and transmitted to the control room, so that the real-time flow data of each vacuum point of the paper machine can be remotely displayed. During the detection process, the observation window 205 can be used to observe the flow rate of the paper machine. Observe the situation inside the outer box body 201, and determine whether to clean and maintain the inside of the outer box body 201 through the inspection port 204. Compared with the traditional detection method, this detection method has a simple structure, low cost, high reliability, and is suitable for all paper machines and paper types. It can perform real-time dehydration detection on all vacuum points of the paper machine, which is beneficial to adjust the vacuum at each point, accurately control the dehydration process, reduce unnecessary vacuum energy consumption, and achieve energy saving and consumption reduction. In summary, when in use, the dehydration amount can be accurately and conveniently detected in real time, and the dehydration process can be controlled to achieve energy saving and consumption reduction.

[0035] See also Figures 2 to 7A cleaning assembly 3 is arranged outside the weir plate cylinder 208, and the cleaning assembly 3 includes a shroud 301 and a mounting groove 302. A shroud 301 is arranged outside the weir plate cylinder 208, and a mounting groove 302 is opened on the surface of the shroud 301. Four mounting grooves 302 are evenly distributed on the circumference of the shroud 301. The cleaning assembly 3 also includes a clamping cavity 303, a clamping groove 304 and a mounting rod 305. The clamping cavities 303 are symmetrically opened on both sides of the mounting groove 302, and a clamping groove 304 is opened on one side of the clamping cavity 303. The mounting groove 302 is clamped and connected There is a mounting rod 305, and the cleaning component 3 also includes a clamping spring 306, a clamping rod 307 and a clamping block 308. The clamping spring 306 is connected in the clamping cavity 303, and one end of the clamping spring 306 is connected to the clamping rod 307, and one side of the clamping rod 307 is connected to the clamping block 308, and the clamping block 308 is slidably connected to the enclosure 301 through the clamping groove 304, and the clamping rod 307 is elastically connected to the clamping cavity 303 through the clamping spring 306, and the clamping rod 307 is slidably connected to the enclosure 301 through the clamping cavity 303, and the cleaning The component 3 also includes a bayonet 309 and a scraper 310. The bayonet 309 is symmetrically provided on both sides of the mounting rod 305, and the scrapers 310 are connected to both ends of the mounting rod 305. The clamping rod 307 is connected to the mounting rod 305 through the bayonet 309. The scrapers 310 are respectively attached to the inner wall of the outer box body 201 and the outer wall of the weir plate tube 208. The four corners of the enclosure 301 are symmetrically connected to the support rod 4, and the other end of the support rod 4 is connected to the connecting frame 5. One side of the connecting frame 5 is connected to the gear rod 6, and one side of the gear rod 6 is connected to the double-linked wheel 7. The vacuum box 1 has two sides. A feed port 8 is provided on the side, and a partition net 9 is provided between the feed ports 8, a drain port 10 is provided on the lower side of the vacuum box 1, and an air extraction port 11 is provided on the rear side of the vacuum box 1, a baffle 12 is connected to one side of the air extraction port 11, and an air extraction hood 13 is connected to the other side of the air extraction port 11, and a sealing groove 14 is provided in the middle of the air extraction hood 13, a sealing plate 15 is slidably connected in the sealing groove 14, and a rack 16 is connected to one side of the sealing plate 15, the rack 16 and the gear rod 6 are both engaged with the double wheel 7, and the rack 16 and the gear rod 6 are located on the same side of the double wheel 7;

[0036] The specific operation is as follows: during the inspection, after the water removed by vacuum accumulates in the outer box body 201, the enclosure 301 will remain floating above the liquid surface due to buoyancy, and move in the outer box body 201 as the liquid level changes. When the enclosure 301 moves, it can drive the scraper 310 to move synchronously through the mounting rod 305 to scrape and clean the stains adhering to the inner wall of the outer box body 201 and the outer wall of the weir plate tube 208. When the scraper 310 needs to be maintained and replaced, the inspection port 204 is opened, and the block 308 is slid in the slot 304 to drive the clamping rod 305 to move synchronously. 7 slides in the card cavity 303 and compresses the card spring 306, so that the card rod 307 is pulled out from the card hole 309, and the restriction on the installation rod 305 is released. At this time, the scraper 310 and the installation rod 305 can be removed from the enclosure 301 and taken out from the inspection port 204. When installing, the installation rod 305 is aligned with the installation groove 302 and lowered, so that the installation rod 305 can be pressed into the card cavity 303 through the inclined surface on the card rod 307. After the installation rod 305 is completely inserted into the installation groove 302, the card rod 307 can be returned under the action of the card spring 306. The scraper 310 is installed by springing and inserting it into the bayonet 309, fixing the mounting rod 305, and completing the installation of the scraper 310. In summary, when in use, the inner wall of the outer box body 201 and the outer wall of the weir plate tube 208 can be cleaned synchronously, and the scraper 310 can be conveniently disassembled and replaced. When in use, after the material enters the vacuum box 1 from the feed port 8, the partition 9 can receive the material. Under the action of the external vacuum pump, the air in the vacuum box 1 is extracted to form a negative pressure, thereby extracting the moisture in the material, and the partition 9 can prevent the material from falling, and the escaped water can be discharged from the drain port 10. It flows into the water inlet 202 through the pipeline, and as the liquid level in the outer box 201 changes, the enclosure 301 is driven to move, and the connecting frame 5 also moves synchronously with the enclosure 301 through the support rod 4, thereby driving the gear rod 6 to move, and then the double wheel 7 drives the sealing plate 15 to move in the sealing groove 14 through the rack 16, and the opening area of ​​the vacuum hood 13 is adjusted, so that the air flow passing through the vacuum port 11 is adjusted, and the auxiliary operation room is synchronously adjusted The dehydration amount, in summary, when in use, the air flow can be automatically adjusted, thereby assisting in regulating the dehydration amount.

[0037] In summary, when the online dehydration detection device and the papermaking vacuum system are used, the material is first fed into the vacuum box 1 from the feed port 8, and the partition 9 can receive the material. Under the action of the external vacuum pump, the air in the vacuum box 1 is extracted to form a negative pressure, thereby extracting the moisture in the material, and the partition 9 can prevent the material from falling. The extracted water can flow into the water inlet 202 from the drain port 10 through the pipeline. The vacuum-extracted water enters the outer box body 201 from the water inlet 202, and then reaches the bottom of the outer box body 201 under the guidance of the guide plate 207, and forms a certain liquid level height on the outside of the weir plate tube 208. Since the trapezoidal overflow port 209 on the weir plate tube 208 is After flow calibration, the liquid level height is proportional to the flow rate flowing through it. The liquid level height is detected by the differential pressure liquid level transmitter 206 and transmitted to the control room, so that the real-time flow data of each vacuum point of the paper machine can be remotely displayed. During the detection process, the internal situation of the outer box body 201 can be observed through the observation window 205 to determine whether to clean and maintain the inside of the outer box body 201 through the inspection port 204. During the detection, after the vacuum-removed water accumulates in the outer box body 201, the enclosure 301 will remain floating above the liquid surface due to buoyancy, and move in the outer box body 201 with the change of liquid level. When the enclosure 301 moves, it can be installed through the mounting rod 3 05 drives the scraper 310 to move synchronously to scrape and clean the stains adhering to the inner wall of the outer box body 201 and the outer wall of the weir tube 208. When the scraper 310 needs to be maintained and replaced, open the inspection port 204, slide the card block 308 in the card slot 304, and drive the card rod 307 to slide in the card cavity 303 and compress the card spring 306, so that the card rod 307 is pulled out from the card slot 309, and the restriction on the installation rod 305 is released. At this time, the scraper 310 and the installation rod 305 can be removed from the enclosure 301 and taken out from the inspection port 204. When installing, align the installation rod 305 with the installation slot 302 and put it down, so that the installation rod 305 can be The inclined surface on the clamping rod 307 is used to press it into the clamping cavity 303. After the installation rod 305 is completely clamped into the installation groove 302, the clamping rod 307 can rebound under the action of the clamping spring 306 and be inserted into the clamping port 309, thereby fixing the installation rod 305 and completing the installation of the scraper 310. When the enclosure 301 moves, the connecting frame 5 also moves synchronously with the enclosure 301 through the support rod 4, thereby driving the gear rod 6 to move, and then the double-linked wheel 7 drives the sealing plate 15 to move in the sealing groove 14 through the rack 16, thereby adjusting the opening area of ​​the exhaust hood 13, adjusting the air flow through the exhaust port 11, and the auxiliary operation room synchronously adjusts the dehydration amount.

[0038] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. An online dehydration detection device, characterized in that: The vacuum box (1) comprises a vacuum box (1) and a detection component (2), wherein the detection component (2) is arranged on one side of the vacuum box (1), and the detection component (2) comprises an outer box body (201), a water inlet (202), a water outlet (203), an inspection port (204), an observation window (205), a differential pressure liquid level transmitter (206), a guide plate (207), a weir plate cylinder (208) and an overflow port (209), wherein one side of the vacuum box (1) is connected to the outer box body (201) via a pipeline, and the upper part of the outer box body (201) is provided with a water inlet (202), and the lower part of the outer box body (201) is provided with a The outer box (201) has a water outlet (203), an inspection port (204) is provided on one side of the outer box (201), and an observation window (205) is provided on the other side of the outer box (201), a differential pressure liquid level transmitter (206) is provided on the outer box (201) below the observation window (205), and a guide plate (207) is connected to the water inlet (202) side of the outer box (201), a weir plate tube (208) is connected to the water outlet (203) side of the outer box (201), and an overflow port (209) is provided on the side of the weir plate tube (208) close to the observation window (205).

2. An online dehydration detection device according to claim 1, characterized in that: The water inlet (202) is connected to the interior of the vacuum box (1) through a pipeline, the guide plate (207) is obliquely distributed in the outer box body (201), the overflow port (209) is trapezoidal, and the liquid level height in the outer box body (201) is proportional to the flow rate flowing through the overflow port (209).

3. An online dehydration detection device according to claim 1, characterized in that: A cleaning assembly (3) is arranged on the outside of the weir plate cylinder (208), and the cleaning assembly (3) comprises a surrounding plate (301) and a mounting groove (302). A surrounding plate (301) is arranged on the outside of the weir plate cylinder (208), and a mounting groove (302) is provided on the surface of the surrounding plate (301), and four mounting grooves (302) are equidistantly distributed on the surrounding plate (301).

4. An online dehydration detection device according to claim 3, characterized in that: The cleaning assembly (3) further comprises a card cavity (303), a card slot (304) and a mounting rod (305); the card cavities (303) are symmetrically provided on both sides of the mounting slot (302); a card slot (304) is provided on one side of the card cavity (303); and the mounting rod (305) is snap-connected in the mounting slot (302).

5. An online dehydration detection device according to claim 4, characterized in that: The cleaning assembly (3) further comprises a clamping spring (306), a clamping rod (307) and a clamping block (308); the clamping spring (306) is connected inside the clamping cavity (303), and one end of the clamping spring (306) is connected to the clamping rod (307); one side of the clamping rod (307) is connected to the clamping block (308), and the clamping block (308) is slidably connected to the enclosure (301) via the clamping groove (304); the clamping rod (307) is elastically connected to the clamping cavity (303) via the clamping spring (306), and the clamping rod (307) is clamped and slidably connected to the enclosure (301) via the clamping cavity (303).

6. An online dehydration detection device according to claim 5, characterized in that: The cleaning assembly (3) further comprises a bayonet (309) and a scraper (310); the bayonet (309) is symmetrically provided on both sides of the mounting rod (305); and the scrapers (310) are connected to both ends of the mounting rod (305); the connecting rod (307) is connected to the mounting rod (305) by means of the bayonet (309); and the scrapers (310) are respectively attached to the inner wall of the outer box body (201) and the outer wall of the weir plate cylinder (208).

7. An online dehydration detection device according to claim 3, characterized in that: The four corners of the enclosure (301) are symmetrically connected to support rods (4), and the other end of the support rod (4) is connected to a connecting frame (5), one side of the connecting frame (5) is connected to a gear rod (6), and one side of the gear rod (6) is connected to a double wheel (7).

8. An online dehydration detection device according to claim 7, characterized in that: The vacuum box (1) is provided with feed ports (8) on both sides, and a partition net (9) is provided between the feed ports (8); a drain port (10) is provided on the lower side of the vacuum box (1), and an air suction port (11) is provided on the rear side of the vacuum box (1); and a baffle (12) is connected to one side of the air suction port (11).

9. An online dehydration detection device according to claim 8, characterized in that: The other side of the air extraction port (11) is connected to an air extraction hood (13), and a sealing groove (14) is provided in the middle of the air extraction hood (13). A sealing plate (15) is slidably engaged in the sealing groove (14), and a rack (16) is connected to one side of the sealing plate (15). The rack (16) and the gear rod (6) are both engaged with the double-linked wheel (7), and the rack (16) and the gear rod (6) are located on the same side of the double-linked wheel (7).

10. A papermaking vacuum system, used for an online dehydration detection device according to any one of claims 1 to 9, characterized in that: The method of use includes the following steps: S1: feeding the material from the feed port (8) into the vacuum box (1), and starting the external vacuum pump to dehydrate the material; S2: Water gathers in the vacuum box (1) and enters the outer box body (201) from the water inlet (202) through the drain port (10) and the pipe; S3: under the guidance of the guide plate (207), the water gathers outside the weir tube (208) and forms a certain liquid level in the outer box (201), and flows into the inner side of the weir tube (208) through the overflow port (209) and then flows out of the outer box (201) from the water outlet (203); S4: The differential pressure liquid level transmitter (206) detects the liquid level and transmits the data to the control room, thereby controlling the production line and regulating the dehydration process.

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