Paperboard water coating device

Abstract

The invention relates to the technical field of paperboard processing devices, and particularly discloses a paperboard water coating device which comprises a water coating mechanism, a paper pressing mechanism, a water squeezing mechanism and a water storage mechanism. The water coating mechanism achieves water adsorption and transfer through rotation of a water coating roller with the surface coated with a hydrophilic material; the paper pressing mechanism can adjust the wrapping angle of the paper and the water coating roller so as to optimize the contact path. The water squeezing mechanism adopts a water squeezing rod with adjustable pressure to control the water content of the hydrophilic material; the water storage mechanism maintains a constant soaking environment through water level control. Through the synergistic effect of rotary adsorption of the hydrophilic material, pressure regulation and control of the wringing rod and adjustable wrap angle contact, water efficiently and uniformly permeates paper fibers, the problems of non-uniform water distribution, serious resource waste and response delay of a traditional spraying mode are solved, and the flatness, the structural strength and the production energy efficiency of a paperboard are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paperboard processing device, in particular to a paperboard water coating device. BACKGROUND

[0002] With the development of high-speed and diversification of paperboard production, various types of paper are prone to uneven moisture distribution due to environmental factors, which directly leads to quality problems such as poor adhesion and warping of finished paperboard. The continuous improvement of market requirements for paperboard flatness and strength makes accurate control of paper moisture content a key link in the production process.

[0003] The current industry generally uses humidification technology to improve paper moisture content, for example, a corrugated paper humidification device disclosed in Chinese patent publication No. CN106480782A sprays clean water through a water spray port, sprays gas in the atomizing nozzle, the gas acts on the clean water to become mist, and the atomizing nozzle sprays the mist onto the corrugated paper on the rotating shaft. The corrugated paper receives the action of the mist, avoids being too dry, and facilitates later operation of the corrugated paper. This method relies on the free diffusion of gas-liquid mixture, and the motion trajectory and deposition amount of water in the air are difficult to accurately control.

[0004] The existing water spraying technology has the following significant defects: water mist is easily deviated from the target area due to environmental air flow interference, causing a large amount of water resource waste and equipment pollution; water content only relies on gravity to naturally penetrate the paper, which has low absorption efficiency and poor uniformity, and cannot meet the real-time demand of water content response of high-speed production line. SUMMARY

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide a paperboard water coating device to solve the above-mentioned problems.

[0006] A paperboard water coating device, comprising:

[0007] A water coating mechanism, comprising a water coating roller, a hydrophilic material coated on the surface of the water coating roller, and a driving device for driving the water coating roller to rotate;

[0008] A paper pressing mechanism for adjusting the wrapping angle of the paperboard and the water coating roller;

[0009] A water squeezing mechanism, comprising a water squeezing rod that can be pressure-adjusted to press the water coating roller, for squeezing and controlling the water content of the hydrophilic material;

[0010] A water storage mechanism, comprising a water storage tray, the lower end of the water coating roller is immersed in the water storage tray, and the water coating roller rotates to absorb the water in the water storage tray.

[0011] Specifically, the paperboard water coating device further comprises a rack, and the water coating mechanism, the paper pressing mechanism, the water squeezing mechanism and the water storage mechanism are all arranged on the rack.

[0012] Specifically, the paper pressing mechanism comprises a fixed roller, a tension arm, a paper wrapping roller and a first cylinder;

[0013] The machine frame is provided with two fixed rollers, which are arranged on the upper and lower sides of the water coating roller.

[0014] The body of the first cylinder is hinged to the machine frame, and the telescopic end of the first cylinder is hinged to the tension arm.

[0015] One end of the tension arm is hinged to the machine frame, and the other end is connected to the paper wrapping roller.

[0016] The paperboard passes through the upper fixed roller, the paper wrapping roller, the water coating roller and the lower fixed roller in sequence.

[0017] Specifically, the tension arm is hinged to the machine frame through a first bearing, and the paper wrapping roller is hinged to the tension arm through a second bearing.

[0018] The machine frame is further provided with a mechanical limiting block for limiting the swing angle of the tension arm.

[0019] Specifically, the driving device comprises a first motor fixed on the machine frame, a small pulley connected to the output shaft of the first motor, a tension sleeve connected to one end of the water coating roller, a large pulley sleeved on the tension sleeve, and a synchronous belt connecting the large pulley and the small pulley.

[0020] Specifically, one end of the water coating roller is rotatably arranged on the machine frame through a third bearing, and the other end of the water coating roller is rotatably arranged on the machine frame through a fixed seat.

[0021] Specifically, the water squeezing mechanism further comprises a rotating arm module for controlling the contact or separation of the water squeezing rod and the water coating roller, the rotating arm module comprises a second cylinder arranged on the machine frame, a rotating arm connected to the telescopic end of the second cylinder, a rotating shaft connected to the rotating end of the rotating arm, a support bearing fixed on the machine frame and sleeved on the rotating shaft, and a base beam connected to one end of the rotating shaft, the water squeezing rod is driven by the base beam to realize the contact or separation with the water coating roller.

[0022] Specifically, the water squeezing mechanism further comprises a pressure adjusting module for controlling the pressure of the water squeezing rod on the water coating roller, the pressure adjusting module comprises a sliding rail fixed on the base beam, a sliding block in sliding cooperation with the sliding rail, and a pressure air bag arranged between the sliding rail and the sliding block, and the water squeezing rod is arranged at one end of the sliding block away from the base beam.

[0023] Specifically, the water squeezing mechanism further comprises a third motor, and the third motor is drivingly connected with the water squeezing rod through a universal joint.

[0024] The surface of the squeeze bar has a plurality of checkered patterns.

[0025] Specifically, the water storage mechanism further comprises a water inlet pipe connected to the side wall of the water storage disc, an inlet electromagnetic valve arranged on the water inlet pipe, a water outlet pipe connected to the bottom of the water storage disc, an outlet electromagnetic valve arranged on the water outlet pipe, and a liquid level sensor arranged in the water storage disc.

[0026] The beneficial effects of the present application are:

[0027] The paperboard water coating device of the present application comprises a water coating mechanism, a paper pressing mechanism, a water squeezing mechanism, and a water storage mechanism: the water coating mechanism realizes water adsorption and transmission through the rotation of a water coating roller with a hydrophilic material on the surface; the paper pressing mechanism can adjust the wrapping angle of the paper and the water coating roller to optimize the contact path; the water squeezing mechanism controls the water content of the hydrophilic material by adjusting the pressure of the water squeezing rod; and the water storage mechanism maintains a constant soaking environment through water level control. Through the synergistic effect of rotating adsorption of the hydrophilic material, pressure regulation of the water squeezing rod, and adjustable angle contact, the present application realizes efficient and uniform water penetration into paper fibers, solves the problems of uneven water distribution, serious resource waste, and slow response caused by traditional spraying methods, and significantly improves the flatness, structural strength, and production efficiency of paperboard. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a front view of the paperboard water coating device of the present application;

[0029] Figure 2 It is Figure 1 a sectional view along line A-A;

[0030] Figure 3 It is a perspective view of the paperboard water coating device of the present application;

[0031] Figure 4 It is Figure 3 an enlarged view of part A;

[0032] Figure 5 It is a left view of the water coating mechanism and the paper pressing mechanism of the present application;

[0033] Figure 6 It is a perspective view of the water coating mechanism and the water storage mechanism of the present application;

[0034] Figure 7 It is a perspective view of the water squeezing mechanism of the present application;

[0035] Figure 8 It is a left view of the water squeezing mechanism of the present application;

[0036] Figure 9 It is a perspective view of the water storage mechanism of the present application;

[0037] Figure 10A front view of the water storage mechanism of the present application.

[0038] The reference signs are: water coating mechanism 10, water coating roller 11, hydrophilic material 12, driving device 13, paper pressing mechanism 20, paperboard 51, water squeezing mechanism 30, water squeezing rod 31, water storage mechanism 40, water storage disc 41, rack 50, fixed roller 21, tension arm 22, paper wrapping roller 23, first cylinder 24, first bearing 25, second bearing 26, mechanical limiting block 27, first motor 131, small pulley 132, tension sleeve 133, large pulley 134, synchronous belt 135, third bearing 14, fixed seat 15, rotating arm module 32, second cylinder 321, rotating arm 322, rotating shaft 323, supporting bearing 324, base beam 325, pressure adjusting module 33, sliding rail 331, sliding block 332, pressure air bag 333, third motor 34, universal coupling 35, water inlet pipe 42, inlet electromagnetic valve 43, water outlet pipe 44, outlet electromagnetic valve 45, liquid level sensor 46. DETAILED DESCRIPTION

[0039] The present application provides a paperboard water coating device, in order to make the purpose, technical scheme and effect of the present application more clear and definite, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0040] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0041] Please refer to Figures 1 to 10 The paperboard water coating device of the embodiment comprises:

[0042] The water coating mechanism 10 comprises a water coating roller 11, a hydrophilic material 12 coated on the surface of the water coating roller 11, and a driving device 13 for driving the water coating roller 11 to rotate;

[0043] The paper pressing mechanism 20 is used to adjust the wrapping angle of the paperboard 51 and the water coating roller 11;

[0044] The water squeezing mechanism 30 comprises a water squeezing rod 31 which can be pressure-adjusted to press the water coating roller 11, and is used to squeeze and control the water content of the hydrophilic material 12;

[0045] The water storage mechanism 40 comprises a water storage disc 41, the lower end of the water coating roller 11 is immersed in the water storage disc 41, and the water coating roller 11 drives the hydrophilic material 12 to rotate and absorb the moisture in the water storage disc 41.

[0046] The water application operation of the paperboard water application device of the embodiment is as follows: the paperboard 51 is first adjusted by the paper pressing mechanism 20 to the wrapping angle with the water application roller 11 to ensure that the paperboard 51 can be stably wrapped on the hydrophilic material 12 of the water application roller 11; the water application roller 11 is driven to rotate by the driving device 13, the lower end of which is immersed in the water storage disc 41 of the water storage mechanism 40 to drive the hydrophilic material 12 to absorb water; the water squeezing rod 31 of the water squeezing mechanism 30 can be pressure-adjusted to press the water application roller 11, so that the water content of the hydrophilic material 12 can be controlled according to production requirements; the hydrophilic material 12 that has absorbed water uniformly transfers water to the surface of the paperboard 51 during rotation.

[0047] The application realizes the stability and efficiency of water transfer, the water application roller 11 in the rolling application mode makes the water distribution of the paperboard 51 more uniform at each position, greatly reduces waste, and improves flatness; at the same time, the heat storage capacity of the paperboard 51 is enhanced, the energy consumption and the amount of glue are reduced, and finally the overall paperboard quality is improved.

[0048] Please refer to Figures 1 to 3 The paperboard water application device of the embodiment further comprises a rack 50, and the water application mechanism 10, the paper pressing mechanism 20, the water squeezing mechanism 30 and the water storage mechanism 40 are all arranged on the rack 50, and the rack 50 comprises two vertical plates arranged on the left and right, and the water application mechanism 10, the paper pressing mechanism 20, the water squeezing mechanism 30 and the water storage mechanism 40 are integrated on the rack 50, so that the structure is more compact.

[0049] Please refer to Figure 4 and Figure 5 The paper pressing mechanism 20 of the embodiment comprises a fixed roller 21, a tension arm 22, a paper wrapping roller 23 and a first cylinder 24; the rack 50 is rotatably provided with two fixed rollers 21, and the two fixed rollers 21 are arranged on the upper and lower sides of the water application roller 11; the body of the first cylinder 24 is hinged to the rack 50, and the extension end of the first cylinder 24 is hinged to the tension arm 22; one end of the tension arm 22 is hinged to the rack 50, and the other end is connected to the paper wrapping roller 23; the paperboard 51 passes through the upper fixed roller 21, the paper wrapping roller 23, the water application roller 11 and the lower fixed roller 21 in sequence.

[0050] When threading the paper, the first cylinder 24 is in the extended state, which is convenient for the operator to guide the paperboard 51 to pass through the upper fixed roller 21, the paper wrapping roller 23, the water application roller 11 and the lower fixed roller 21 in sequence; after starting work, the corresponding air pressure can be input to the first cylinder 24 according to the parameters of paperboards 51 of different specifications, the first cylinder 24 is retracted to drive the tension arm 22 to rotate around the hinge point of the rack 50, the rotation of the tension arm 22 drives the paper wrapping roller 23 to swing synchronously, so that the paperboard 51 forms an adjustable wrapping angle on the surface of the water application roller 11, realizing directional transfer of water from the hydrophilic material 12 to the paperboard 51; at the same time, real-time adjustment of the wrapping angle can ensure that paperboards 51 of different specifications can stably receive water transfer from the hydrophilic material 12.

[0051] The paper pressing mechanism 20 of the embodiment controls the wrapping angle by controlling the air pressure of the first cylinder 24, can adapt to the water demand of paperboard 51 of different specifications, and improves the stability of water transfer.

[0052] Further, the hydrophilic material 12 can be a composite non-woven fabric, polyurethane sponge or polyvinyl alcohol hydrogel, etc. with hydrophilic material.

[0053] Further, the tension arm 22 is hinged to the rack 50 through the first bearing 25, and the paper wrapping roller 23 is hinged to the tension arm 22 through the second bearing 26; when the control system inputs the air pressure to the first cylinder 24 according to the parameters of the paperboard 51, the first cylinder 24 is driven to contract and rotate the tension arm 22 around the first bearing 25, and the tension arm 22 drives the paper wrapping roller 23 to displace synchronously, so that the paperboard 51 forms a dynamically adjustable wrapping angle on the surface of the water coating roller 11.

[0054] The paper wrapping roller 23 of the embodiment realizes non-relative speed rotation with the tension arm 22 through the second bearing 26, that is, the speed difference between the paper 51 and the roller body of the paper wrapping roller 23 is eliminated, and the risk of paperboard 51 wrinkling is significantly reduced.

[0055] Further, the rack 50 is also provided with a mechanical limiting block 27 for limiting the swinging angle of the tension arm 22. By rigidly restricting the maximum swinging angle of the tension arm 22, the overloading of the first cylinder 24 is effectively prevented, and the operation safety of the paper pressing mechanism 20 is ensured.

[0056] Please refer to Figure 6 , the driving device 13 includes a first motor 131 fixed on the rack 50, a small pulley 132 connected to the output shaft of the first motor 131, a tension sleeve 133 connected to one end of the water coating roller 11, a large pulley 134 sleeved on the tension sleeve 133, and a synchronous belt 135 connecting the large pulley 134 and the small pulley 132. After the first motor 131 is started, the small pulley 132 is driven to rotate, the large pulley 134 is driven to rotate synchronously through the synchronous belt 135, and the tension sleeve 133 maintains the constant tension of the synchronous belt 135; the large pulley 134 drives the water coating roller 11 to rotate, and drives the hydrophilic material 12 on the surface of the water coating roller 11 to continuously absorb the moisture in the water storage tray 41; the contact surface between the hydrophilic material 12 and the paperboard 51 forms a speed difference, and the moisture is uniformly penetrated into the fibers of the paperboard 51 in the relative motion.

[0057] The synchronous belt 135 transmission ensures the stable speed of the water coating roller 11, and the continuous controllable water absorption and release process of the hydrophilic material 12; the speed difference design realizes efficient transfer of moisture in motion, significantly improves the uniformity of water absorption of the paperboard 51, reduces the waste of water resources, and at the same time enhances the structural strength and thermal stability of the paperboard.

[0058] Further, one end of the water coating roller 11 is rotatably arranged on the frame 50 through a third bearing 14, and the other end of the water coating roller 11 is rotatably arranged on the frame 50 through a fixed seat 15. This double support design significantly improves the stability and coaxiality of the rotation of the water coating roller 11, reduces vibration friction and wear, prolongs the service life of the water coating roller 11, and at the same time ensures the smooth operation of the hydrophilic material 12 when absorbing moisture from the water storage tray 41, thereby enhancing the uniformity of the water coating of the paperboard 51 and the overall reliability of the device.

[0059] Please refer to Figure 7 and Figure 8 The water squeezing mechanism 30 of the embodiment further comprises a rotating arm module 32 for controlling the contact or separation of the water squeezing rod 31 with the water coating roller 11, the rotating arm module 32 comprising a second air cylinder 321 arranged on the frame 50, a rotating arm 322 connected to the telescopic end of the second air cylinder 321, a rotating shaft 323 connected to the rotating end of the rotating arm 322, a support bearing 324 fixed to the frame 50 and sleeved on the rotating shaft 323, and a base beam 325 connected to one end of the rotating shaft 323, the water squeezing rod 31 being driven by the base beam 325 to realize its contact or separation with the water coating roller 11.

[0060] The action of the rotating arm module 32 is as follows: when the water squeezing mechanism 30 is in a non-working state, the second air cylinder 321 is retracted to drive the rotating arm 322 to rotate around the support bearing 324 as the axis, and the base beam 325 is lifted to separate the water squeezing rod 31 from the water coating roller 11, at which time the maintenance and replacement of the water squeezing rod 31 can be carried out; when switched to a working state, the second air cylinder 321 is extended to push the rotating arm 322 to rotate in the opposite direction, and the base beam 325 is simultaneously pressed down to accurately position the water squeezing rod 31 with the water coating roller 11, and the water squeezing rod 31 is pressed to the hydrophilic material 12 to realize the directional transfer of moisture.

[0061] The embodiment drives the rotating arm 322 through the second air cylinder 321 to realize the rapid contact and separation of the water squeezing rod 31, greatly improving the maintenance efficiency of the device; the rigid transmission of the base beam 325 ensures the positioning accuracy of the water squeezing rod 31 with the water coating roller 11, guarantees the stability of the water content control of the hydrophilic material 12, and finally significantly improves the water coating uniformity and production continuity of the paperboard 51.

[0062] Further, the water squeezing mechanism 30 further comprises a pressure adjusting module 33 for controlling the pressure of the water squeezing rod 31 on the water coating roller 11, the pressure adjusting module 33 comprising a sliding rail 331 fixed to the base beam 325, a sliding block 332 in sliding cooperation with the sliding rail 331, and a pressure air bag 333 arranged between the sliding rail 331 and the sliding block 332, the water squeezing rod 31 being arranged at the end of the sliding block 332 away from the base beam 325.

[0063] The pressure regulating module 33 works as follows: when the water squeezing rod 31 is positioned to the water coating roller 11 through the base beam 325, different pressure gas is injected into the pressure air bag 333, the pressure air bag 333 expands and deforms to push the sliding block 332 to linearly displace along the sliding rail 331, thereby driving the water squeezing rod 31 to press the hydrophilic material 12 at an adjustable pressure; the change of the gas pressure is converted into the change of the pressing force in real time, so as to realize the dynamic regulation and control of the water content of the hydrophilic material 12.

[0064] The gas pressure driving mechanism of the pressure air bag 333 in the embodiment enables the water squeezing rod 31 to quickly adjust the pressure, so as to adapt to the water content requirements of different paperboards 51; the rigid guide structure of the sliding rail 331 and the sliding block 332 ensures that the pressing force is vertically applied to the water coating roller 11, thereby completely eliminating the material wear or uneven water caused by pressure bias, and significantly improving the water coating consistency and device durability of the paperboard 51.

[0065] Further, the water squeezing mechanism 30 further comprises a third motor 34, the third motor 34 is in driving connection with the water squeezing rod 31 through a universal coupling 35; the water squeezing rod 31 has a plurality of divided patterns on the surface. When the water squeezing mechanism 30 is started, the third motor 34 drives the water squeezing rod 31 to rotate through the universal coupling 35, and the divided patterns on the surface of the water squeezing rod 31 accurately divide the water in the hydrophilic material 12 into uniform small grids; this dynamic division mechanism greatly improves the uniformity of water distribution, so that the paperboard 51 can efficiently and uniformly absorb water, and significantly enhances the water coating uniformity and overall quality stability.

[0066] Please refer to Figure 9 and Figure 10 The water storage mechanism 40 further comprises a water inlet pipe 42 connected to the side wall of the water storage disc 41, an inlet electromagnetic valve 43 arranged on the water inlet pipe 42, a water outlet pipe 44 connected to the bottom of the water storage disc 41, an outlet electromagnetic valve 45 arranged on the water outlet pipe 44, and a liquid level sensor 46 arranged in the water storage disc 41. In the initial state, the inlet electromagnetic valve 43 is opened to make water flow through the water inlet pipe 42 and be injected into the water storage disc 41, and the water level is monitored in real time by the liquid level sensor 46; when the water level reaches a preset threshold, the liquid level sensor 46 triggers a signal to close the inlet electromagnetic valve 43 and synchronously open the outlet electromagnetic valve 45, so that the excess water flows back to the external water pool through the water outlet pipe 44, thereby forming a dynamic water level control.

[0067] The preferred embodiments of the application are specifically described above, but the application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the application.

Claims

1. A paperboard water coating device characterized by, The application relates to a paperboard water coating device. The paperboard water coating device comprises a water coating mechanism (10), a paperboard pressing mechanism (20), a water squeezing mechanism (30) and a water storage mechanism (40). The water coating mechanism (10) comprises a water coating roller (11), a hydrophilic material (12) coated on the surface of the water coating roller (11), and a driving device (13) for driving the water coating roller (11) to rotate. The paperboard pressing mechanism (20) is used for adjusting the wrapping angle of the paperboard (51) and the water coating roller (11). The water squeezing mechanism (30) comprises a water squeezing rod (31) which can be pressed to adjust the pressure and press the water coating roller (11), and is used for squeezing and controlling the water content of the hydrophilic material (12).

2. A paperboard water coating device according to claim 1, characterized in that The water storage mechanism (40) comprises a water storage tray (41), and the lower end of the water coating roller (11) is soaked in the water storage tray (41); the water coating roller (11) drives the hydrophilic material (12) to rotate and adsorb the moisture in the water storage tray (41).

3. A paperboard water coating device according to claim 2, characterized in that The paperboard water coating device further comprises a rack (50), and the water coating mechanism (10), the paperboard pressing mechanism (20), the water squeezing mechanism (30) and the water storage mechanism (40) are arranged on the rack (50). The paperboard pressing mechanism (20) comprises a fixed roller (21), a tension arm (22), a paper wrapping roller (23) and a first air cylinder (24). The rack (50) is provided with two fixed rollers (21) which are arranged on the upper and lower sides of the water coating roller (11). The body of the first air cylinder (24) is hinged to the rack (50), and the telescopic end of the first air cylinder (24) is hinged to the tension arm (22). One end of the tension arm (22) is hinged to the rack (50), and the other end is connected to the paper wrapping roller (23).

4. A paperboard water coating device according to claim 3, characterized in that The paperboard (51) passes through the upper fixed roller (21), the paper wrapping roller (23), the water coating roller (11) and the lower fixed roller (21) in sequence. The tension arm (22) is hinged to the rack (50) through a first bearing (25), and the paper wrapping roller (23) is hinged to the tension arm (22) through a second bearing (26).

5. A paperboard water coating device according to claim 2, characterized in that The rack (50) is further provided with a mechanical limiting block (27) for limiting the swing angle of the tension arm (22).

6. A paperboard water coating device according to claim 2, characterized in that The driving device (13) comprises a first motor (131) fixed on the rack (50), a small pulley (132) connected to the output shaft of the first motor (131), a tension sleeve (133) connected to one end of the water coating roller (11), a large pulley (134) sleeved on the tension sleeve (133), and a synchronous belt (135) connecting the large pulley (134) and the small pulley (132). One end of the water coating roller (11) is rotatably arranged on the rack (50) through a third bearing (14), and the other end of the water coating roller (11) is rotatably arranged on the rack (50) through a fixed seat (15).

7. A paperboard water coating device as defined in claim 2, wherein, The squeezing mechanism (30) further comprises a rotating arm module (32) for controlling the contact or separation of the squeezing rod (31) and the water coating roller (11), the rotating arm module (32) comprising a second cylinder (321) arranged on the frame (50), a rotating arm (322) connected to the telescopic end of the second cylinder (321), a rotating shaft (323) connected to the rotating end of the rotating arm (322), a support bearing (324) fixed to the frame (50) and sleeved on the rotating shaft (323), and a base beam (325) connected to one end of the rotating shaft (323), the squeezing rod (31) being driven by the base beam (325) to realize the contact or separation with the water coating roller (11).

8. A paperboard water coating device according to claim 7, characterized in that The squeezing mechanism (30) further comprises a pressure adjusting module (33) for controlling the pressure of the squeezing rod (31) on the water coating roller (11), the pressure adjusting module (33) comprising a sliding rail (331) fixed to the base beam (325), a sliding block (332) in sliding cooperation with the sliding rail (331), and a pressure air bag (333) arranged between the sliding rail (331) and the sliding block (332), the squeezing rod (31) being arranged at one end of the sliding block (332) away from the base beam (325).

9. A paperboard water coating device as defined in claim 1, wherein, The squeezing mechanism (30) further comprises a third motor (34) in driving connection with the squeezing rod (31) through a universal coupling (35). The surface of the squeezing rod (31) has a plurality of lattice patterns.

10. A paperboard water coating device as defined in claim 1, wherein, The water storage mechanism (40) further comprises a water inlet pipe (42) connected to the side wall of the water storage disc (41), an inlet electromagnetic valve (43) arranged on the water inlet pipe (42), a water outlet pipe (44) connected to the bottom of the water storage disc (41), an outlet electromagnetic valve (45) arranged on the water outlet pipe (44), and a liquid level sensor (46) arranged in the water storage disc (41).

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