A calender device capable of improving paper smoothness

Abstract

The application discloses a calendering device capable of improving paper smoothness, and particularly relates to the field of paper calendering, which comprises a calendering box body, a guide roller arranged at one end of the calendering box body close to a feeding port, a first humidity detection roller and a second humidity detection roller arranged in the calendering box body, a tension detection roller arranged on one side of the second detection roller in the calendering box body, an adjusting roller arranged on one side of the tension detection roller, a main pressing roller and an auxiliary pressing roller arranged on one side of the adjusting roller in the calendering box body, a first humidifying nozzle installed on the upper end of one side of the first humidity detection roller in the calendering box body, and a second humidifying nozzle installed on one side of the second humidity detection roller in the calendering box body. The application can perform humidifying treatment on paper before calendering, so that the dryness of the paper is kept at 70-80%, and large internal fiber stress is not generated during calendering, which improves the paper smoothness and reduces the paper surface groove marks and rewinding paper breakage.

Description

Technical Field

[0001] This invention relates to the field of paper calendering technology, specifically to a calendering device that can improve the smoothness of paper. Background Technology

[0002] In the paper manufacturing process, calendering is usually required for paper. Calenders on papermaking production lines serve two main purposes: first, finishing, improving the smoothness, gloss, and density of the paper web, or improving smoothness and gloss while maintaining bulk; second, correcting the thickness of the paper web or maintaining uniform density. During papermaking, calendering is often necessary to improve the surface properties of the paper (such as smoothness and gloss) and to reduce transverse thickness fluctuations. Calendering involves applying pressure to the paper, causing deformation in its thickness direction. When the pressure is removed, some of the deformation is restored, while the rest is permanently retained. Calendering not only directly determines the appearance quality of the paper (such as smoothness and gloss) but also indirectly affects its printability, writing performance, and other functional characteristics. High-quality calendering allows for better ink absorption in subsequent printing processes.

[0003] Existing calenders are mainly divided into two types: hard calenders and soft calenders. Hard calenders are more commonly used in various paper mills. Their hot rolls are cold-cast rolls, and steam or hot water is introduced into the shaft to regulate the temperature of the roll surface. Hard rolls are characterized by high hardness, smooth surface, good thermal conductivity, and low thermal deformation. Soft calenders transfer heat and mechanical energy to the paper web and utilize surface shear and compression. The pulp components flow gently, resulting in a very fine and smooth surface on the paper surface in contact with the metal hot rolls. Soft calenders typically consist of a pressure zone composed of a hot hard roll and a flexible roll. As the paper web passes through the pressure zone, the density increases evenly across the entire width. Due to the wider pressure zone, the paper web stays in the pressure zone for a longer time, and the increased energy consumption is converted into heat and transferred to the paper web, softening the fibers on the paper web surface, making it easier to calender and increasing smoothness.

[0004] For example, a calendering device for improving paper smoothness disclosed in Chinese Patent Publication No. CN 207973942 U, through precise control of the temperature of the upper soft roller and the linear pressure of the lower steel roller, greatly improves the smoothness and stability of the prepared paper surface.

[0005] However, existing paper calendering devices mainly adjust the smoothness of paper on the calender by using calendering hard rolls and controllable medium-high rolls. But since the paper dryness is 90-95% at this time, the calender's ability to improve smoothness is limited. If the calender is used to apply strong calendering to improve paper smoothness, it will cause large internal stress in the paper. After rewinding in the rewinder, the internal stress is released, resulting in grooves on the paper roll surface and paper breakage during rewinding. Summary of the Invention

[0006] The purpose of this invention is to provide a calendering device that can improve the smoothness of paper, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A calendering device for improving paper smoothness includes a calendering box, a feed inlet on one side of the calendering box, a guide roller at one end of the calendering box near the feed inlet, a first humidity detection roller and a second humidity detection roller inside the calendering box, a tension detection roller on one side of the second humidity detection roller inside the calendering box, an adjusting roller on one side of the tension detection roller, a main pressure roller and a secondary pressure roller on one side of the adjusting roller inside the calendering box, a first humidifying nozzle mounted on the upper end of one side of the first humidity detection roller inside the calendering box, and a second humidifying nozzle mounted on the upper end of one side of the second humidity detection roller inside the calendering box.

[0008] Furthermore, both the first and second humidity detection rollers are driven by servo motors. A rotary joint is provided on the output shaft between the servo motor and the first and second humidity detection rollers. Multiple humidity detection probes are evenly embedded in the inner sidewalls of the first and second humidity detection rollers. A lead wire cavity is opened in the middle of the interior of the first and second humidity detection rollers. A conductive bus is provided inside the lead wire cavity. The conductive bus is electrically connected to the multiple humidity detection probes. One end of the conductive bus passes through the conductive bus and is connected to an external power supply.

[0009] Furthermore, both the first and second humidifying nozzles are fixedly mounted on the spray plate. Each of the two spray plates has an infusion pipe at its upper end. The ends of the two infusion pipes away from the spray plate are connected to the output port of a three-way valve. The input end of the three-way valve is connected to the output end of a water pump. One end of the water pump is connected to a storage tank, which is fixedly mounted on the upper end of the calendering box.

[0010] Furthermore, multiple first and second humidifying nozzles are evenly spaced at the bottom of the spray plate, and a solenoid valve is provided at the output port of each first and second humidifying nozzle.

[0011] Furthermore, a collection trough is provided on the bottom side wall inside the calendering box. The collection trough is inclined, and a drain outlet is provided at the inclined end of the collection trough. One end of the drain outlet is connected to a liquid collection tank. The liquid collection tank is provided with a liquid inlet channel, and a filter screen is provided inside the liquid inlet channel.

[0012] Furthermore, a circulating water pump is installed inside the collection tank. The output port of the circulating water pump is connected to a water inlet disc. A rotating shaft is rotatably installed in the middle of the water inlet disc. Several sealing plates are evenly spaced on the outer wall of the rotating shaft. The side wall of the sealing plate is slidably disposed with the inner side wall of the water inlet disc, and the outer side wall of the sealing plate is covered with a sealing rubber ring. A first connecting rod is rotatably installed at the outer end of the rotating shaft, and a second connecting rod is rotatably installed at the upper end of the first connecting rod.

[0013] Furthermore, the second connecting rod is slidably mounted on the sleeve, a cleaning rod is fixedly mounted on the upper end of the second connecting rod, a cleaning brush is fixedly mounted on the cleaning rod, one end of the cleaning brush is in contact with the filter screen, and a slag collection drawer is provided at the bottom end of the liquid inlet channel.

[0014] Furthermore, a pressure sensor is embedded in the upper end of the tension detection roller, and both ends of the adjustment roller are rotatably mounted on the support frame. A rotating shaft is fixedly mounted at one end of the support frame, and a gear is connected to one end of the rotating shaft. A toothed plate is meshed at one end of the gear, and one end of the toothed plate is fixedly mounted at the telescopic end of the telescopic cylinder.

[0015] Furthermore, a support plate is fixedly installed on the support frame of the tension detection roller, the gear is rotatably mounted on the support plate, and the rotating shaft is rotatably connected to the support plate.

[0016] Furthermore, a control panel is fixedly installed on the outer wall of the calendering box. The control panel is electrically connected to the humidity detection probe, three-way valve, solenoid valve, circulating water pump, pressure sensor and telescopic cylinder.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, by incorporating a humidity detection roller, a humidifying nozzle, and a humidity sensor, can humidify paper before calendering, maintaining its dryness at 70-80%. This prevents excessive internal fiber stress during calendering, improving paper smoothness and reducing surface grooves and rewinding breaks. Furthermore, the invention features two sets of humidifying nozzles and humidity detection rollers, enabling both coarse and fine humidification to ensure optimal humidification. The liquid generated during humidification is recycled, preventing water waste. The water recycling process also includes automatic cleaning of the filter and collection of filter residue, resulting in high automation and reduced labor costs. This invention, by incorporating a tension detection roller and an adjusting roller, can detect the tension of paper before calendering, preventing wrinkles caused by loose paper during calendering. A telescopic cylinder drives a toothed plate to move, causing the toothed plate to rotate a gear, which in turn rotates a support frame. The rotation angle of the support frame can be controlled according to actual needs, allowing the adjusting roller to provide appropriate tension to the paper, thus adjusting the paper tension and preventing wrinkles during calendering. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the calendering box of the present invention; Figure 3 This is a cross-sectional view of the first humidity detection roller of the present invention; Figure 4 This is a schematic diagram of the internal structure of the liquid collection tank of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is a cross-sectional view of the water inlet disc of the present invention. Figure 7 This is a schematic diagram of the installation structure of the adjusting roller of the present invention.

[0019] In the diagram: 1. Calendering box; 2. Feed inlet; 3. Guide roller; 4. First humidity detection roller; 5. Second humidity detection roller; 6. Tension detection roller; 7. Adjusting roller; 8. Main pressure roller; 9. Secondary pressure roller; 10. First humidifying nozzle; 11. Second humidifying nozzle; 12. Humidity detection probe; 13. Lead wire cavity; 14. Conductive bus; 15. Drive motor; 16. Rotary joint; 17. Spray plate; 18. Infusion pipe; 19. Three-way valve; 20. Water pump; 1. Storage tank; 22. Collection trough; 23. Liquid collection tank; 24. Liquid inlet channel; 25. Circulating water pump; 26. Water inlet disc; 27. Rotating shaft; 28. Sealing plate; 29. ​​First connecting rod; 30. Second connecting rod; 31. Sleeve; 32. Cleaning rod; 33. Filter screen; 34. Cleaning brush; 35. Slag collection drawer; 36. Support frame; 37. Rotating shaft; 38. Gear; 39. Gear plate; 40. Telescopic cylinder; 41. Support plate; 42. Control panel. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0021] Please see Figures 1-6 This invention provides a calendering device that can improve the smoothness of paper, the technical solution of which is as follows: A calendering device for improving paper smoothness includes a calendering box 1, a feed inlet 2 on one side of the calendering box 1, a guide roller 3 near the feed inlet 2 inside the calendering box 1, a first humidity detection roller 4 and a second humidity detection roller 5 inside the calendering box 1, a tension detection roller 6 on one side of the second detection roller 5 inside the calendering box 1, an adjusting roller 7 on one side of the tension detection roller 6, a main pressure roller 8 and a secondary pressure roller 9 on one side of the adjusting roller 7 inside the calendering box 1, a first humidifying nozzle 10 installed at the upper end of one side of the first humidity detection roller 4 inside the calendering box 1, and a second humidifying nozzle 11 installed at the upper end of one side of the second humidity detection roller 5 inside the calendering box 1.

[0022] In a preferred embodiment, both the first humidity detection roller 4 and the second humidity detection roller 5 are driven by a servo motor 15. A rotary joint 16 is provided on the output shaft between the servo motor 15 and the first humidity detection roller 4 and the second humidity detection roller 5. Multiple humidity detection probes 12 are evenly embedded in the inner sidewalls of the first humidity detection roller 4 and the second humidity detection roller 5. A lead wire cavity 13 is opened in the middle of the interior of the first humidity detection roller 4 and the second humidity detection roller 5. A conductive bus 14 is provided inside the lead wire cavity 13. The conductive bus 14 is electrically connected to the multiple humidity detection probes 12. One end of the conductive bus 14 passes through the conductive bus 14 and is connected to an external power supply. Connecting the conductive bus 14 to the external power supply using the rotary joint 16 can prevent the wires from getting tangled when the humidity detection roller rotates, and can ensure the normal operation of the humidity detection probes 12.

[0023] In a preferred embodiment, the first humidifying nozzle 10 and the second humidifying nozzle 11 are both fixedly mounted on the spray plate 17. Each of the two spray plates 17 has an infusion pipe 18 at its upper end. The end of each infusion pipe 18 away from the spray plate 17 is connected to the output port of a three-way valve 19. The input end of the three-way valve 19 is connected to the output end of a water pump 20. One end of the water pump 20 is connected to a storage tank 21, which is fixedly mounted on the upper end of the calendering box 1. Multiple first humidifying nozzles 10 and second humidifying nozzles 11 are evenly spaced at the bottom of the spray plate 17. Each first humidifying nozzle 10 and second humidifying nozzle 11... Each output port is equipped with a solenoid valve. In practical use, the humidity sensor on the first humidity detection roller 4 first detects the paper humidity. If the paper humidity is low, the spray volume of the first humidifying nozzle 10 is increased. After the first humidifying nozzle 10 performs preliminary humidification on the paper, it passes through the second humidity detection roller 5. The second humidity detection roller 5 detects the paper humidity again. If the paper humidity meets the calendering requirements, the second humidifying nozzle 11 is turned off. If the second humidity detection roller 5 detects that the paper humidity is low, the spray volume of the second humidifying nozzle 11 is adjusted according to the paper humidity detected by the second humidity detection roller 5, which can ensure that the paper dryness is maintained at 70-80% during calendering. In a preferred embodiment, a collection groove 22 is provided on the bottom side wall inside the calendering box 1. The collection groove 22 is inclined, and a drain outlet is provided at the inclined end of the collection groove 22. One end of the drain outlet is connected to a liquid collection tank 23. A liquid inlet channel 24 is provided inside the liquid inlet channel 24, and a filter screen 33 is provided inside the liquid inlet channel 24. A circulating water pump 25 is provided inside the liquid collection tank 23. The output port of the circulating water pump 25 is connected to a water inlet disc 26. A rotating shaft 27 is rotatably arranged at the middle position inside the water inlet disc 26. The outer side wall of the rotating shaft 27 is spaced apart. A plurality of sealing plates 28 are evenly arranged. The sidewalls of the sealing plates 28 are slidably disposed with the inner sidewalls of the water inlet disc 26, and the outer sidewalls of the sealing plates 28 are covered with sealing rubber rings. A first connecting rod 29 is rotatably disposed at the outer end of the rotating shaft 27. A second connecting rod 30 is rotatably disposed at the upper end of the first connecting rod 29. The second connecting rod 30 is slidably disposed on the sleeve 31. A cleaning rod 32 is fixedly disposed at the upper end of the second connecting rod 30. A cleaning brush 34 is fixedly disposed on the cleaning rod 32. One end of the cleaning brush 34 is in contact with the filter screen 33. A slag collection drawer 35 is disposed at the bottom end of the liquid inlet channel 24. In practical use, the liquid generated when the first humidifying nozzle 10 and the second humidifying nozzle 11 spray the paper falls into the collection tank 22, and then enters the liquid inlet channel 24 inside the liquid collection tank 23 along the collection tank 22, realizing the recycling of water resources. During the recycling process, the filter screen 33 can filter impurity particles to prevent impurity particles from being sprayed on the paper during recycling. The liquid collected in the liquid collection tank 23 is circulated regularly so that the water resources can be recycled. When the water resources are recycled, the cleaning rod 32 can be moved back and forth to realize the automatic cleaning of the filter screen 33, which can prevent the filter screen 33 from being blocked and affecting normal use.

[0024] The working principle of this invention is as follows: In use, the paper unwound by the unwinding mechanism is introduced into the calendering box 1 through the feed inlet 2. Under the action of the guide roller 3, the paper sequentially passes through the first humidity detection roller 4, the second humidity detection roller 5, the tension detection roller 6, and the adjusting roller 7. Then, the main pressure roller 8 and the auxiliary pressure roller 9 calender the paper. After calendering, the paper passes through the discharge port on the calendering box 1 and is wound up by the winding mechanism. When the paper passes through the first humidity detection roller 4, the humidity detection probe 12 on the outer surface of the first humidity detection roller 4 detects the humidity of the paper and transmits the detection data to the control panel 42. The control panel 42 controls the three-way valve 19 and the solenoid valves at each of the first humidifying nozzles 10 to open based on the data detected by the humidity detection probe 12. In specific use, each Each humidifying nozzle corresponds to a humidity detection probe. The spray volume of the corresponding humidifying nozzle is determined based on the detection data of each humidity detection probe 12, thereby enabling regional humidification treatment according to the humidity of different parts of the paper. When the paper passes through the first humidifying nozzle 10 and then passes through the second humidity detection roller 5, the humidity detection probe 12 on the outer surface of the second humidity detection roller 5 detects the humidity of the paper again. If the paper humidity meets the requirements for calendering, the second humidifying nozzle 11 does not need to continue humidifying the paper. If the paper humidity does not meet the requirements for calendering, the control panel 42 controls the spray volume of each second humidifying nozzle 11 according to the detection structure of the humidity detection probe 12 on the outer surface of the second humidity detection roller 5, thereby ensuring that the dryness of the paper is maintained at 70-80%. Water generated during the humidification of paper by the first humidifying nozzle 10 and the second humidifying nozzle 11 falls into the collection tank 22. The collection tank 22 is inclined, allowing the liquid to enter the liquid collection tank 23. As the liquid enters the liquid collection tank 23, it passes through the liquid inlet channel 24. The filter screen 33 in the liquid inlet channel 24 filters the liquid, achieving water resource recovery. After prolonged collection, the liquid collection tank 23 accumulates a large amount of water, requiring circulation back to the storage tank 21 for reuse. At this time, the circulating water pump 25 is turned on, pumping the liquid from the liquid collection tank 23 to the water inlet disc 26. As the liquid flows, the rotating shaft 27 in the water inlet disc 26 rotates until the liquid flows into the circulating water pipe through the outlet. The liquid then enters the storage tank 21 through the circulating water pipe for continued use. When the rotating shaft 27 rotates, it can drive the second connecting rod 30 to move through the first connecting rod 29. One end of the rotating shaft 27 passes through the water inlet disc 26, and a sealed bearing is provided at the connection between the rotating shaft 27 and the water inlet disc 26 to ensure the sealing effect at the rotating shaft 27 and prevent liquid from leaking out from the rotating shaft 27. Since the second connecting rod 30 is slidably connected to the sleeve 31, the second connecting rod 30 can only move in the vertical direction, thereby causing the second connecting rod 30 to drive the cleaning brush 34 to move in the vertical direction. When the cleaning brush 34 moves, it can clean the filter screen 33 to prevent the filter screen 33 from becoming clogged, and the impurities or flocculent matter that are cleaned off fall into the slag collection drawer 35. Example

[0025] Please see Figure 1 and Figure 7 The circulating water pump 25 pumps the liquid from the collection tank 23 to the inlet disc 37. As the liquid flows, the rotating shaft 38 in the inlet disc 37 rotates until the liquid flows into the circulating water pipe 42 through the outlet, and then into the heating furnace 20 for continued use. The rotation of the rotating shaft 38 drives the second connecting rod 44 to move via the first connecting rod 40. One end of the rotating shaft 38 passes through the inlet disc 37, and a sealed bearing is provided at the connection between the rotating shaft 38 and the inlet disc 37 to ensure a sealing effect and prevent liquid leakage. Because the second connecting rod 44 is slidably connected to the collection tank 23 and the recovery tank 12, the second connecting rod... The rod 44 can only move vertically, thereby causing the second connecting rod 44 to drive the cleaning brush 41 to move vertically. When the cleaning brush 41 moves, it can clean the first filter screen 14 to prevent the first filter screen 14 from becoming clogged. The cleaned impurities or flocculent matter fall into the dust collection drawer 28. A pressure sensor is embedded in the upper end of the tension detection roller 6. The two ends of the adjusting roller 7 are rotatably mounted on the support frame 36. A rotating shaft 37 is fixedly mounted on one end of the support frame 36. A gear 38 is connected to one end of the rotating shaft 37. A toothed plate 39 is meshed on one end of the gear 38. One end of the toothed plate 39 is fixedly mounted on the telescopic end of the telescopic cylinder 40. A support plate 41 is fixedly installed on the frame of the tension detection roller 6. The gear 38 is rotatably mounted on the support plate 41, and the rotating shaft 37 is rotatably connected to the support plate 41. A control panel 42 is fixedly installed on the outer wall of the calender box 1. The control panel 42 is electrically connected to the humidity detection probe 12, the three-way valve 19, the solenoid valve, the circulating water pump 25, the pressure sensor, and the telescopic cylinder 40.

[0026] The working principle of this invention is as follows: After the paper humidity is adjusted, it first passes through the tension detection roller 6. The pressure sensor on the tension detection roller 6 can detect the tension of the paper. The pressure sensor transmits the detection result to the control panel 42. The control panel 42 controls the operation of the telescopic cylinder 40. The telescopic cylinder 40 pushes the toothed plate 39 to move in the vertical direction. In specific use, a limiting protrusion can be fixedly set on one side of the toothed plate 39, and a limiting groove for the movement of the limiting protrusion can be opened on the frame of the tension detection roller 6 to ensure the stability of the toothed plate 39. When the toothed plate 39 moves in the vertical direction, it can cause the gear 38 to rotate. When the gear 38 rotates, it can drive the support frame 36 and the adjusting roller 7 to rotate, so that the adjusting roller 37 can provide different degrees of support for the paper, realize the adjustment of the paper tension, and prevent the paper from wrinkling during the calendering process.

[0027] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A calendering device capable of improving paper smoothness, comprising a calendering box (1), wherein a feed inlet (2) is provided on one side of the calendering box (1), characterized in that: Inside the calendering box (1), there is a guide roller (3) at one end near the feed inlet (2). Inside the calendering box (1), there is a first humidity detection roller (4) and a second humidity detection roller (5). Inside the calendering box (1), there is a tension detection roller (6) located on one side of the second detection roller (5). On one side of the tension detection roller (6), there is an adjustment roller (7). Inside the calendering box (1), there is a main pressure roller (8) and a secondary pressure roller (9) located on one side of the adjustment roller (7). Inside the calendering box (1), there is a first humidifying nozzle (10) installed at the upper end of one side of the first humidity detection roller (4). Inside the calendering box (1), there is a second humidifying nozzle (11) installed at the upper end of one side of the second humidity detection roller (5).

2. The calendering device for improving paper smoothness according to claim 1, characterized in that: Both the first humidity detection roller (4) and the second humidity detection roller (5) are driven by a servo motor (15). A rotary joint (16) is provided on the output shaft between the servo motor (15) and the first humidity detection roller (4) and the second humidity detection roller (5). Multiple humidity detection probes (12) are evenly embedded in the inner sidewalls of the first humidity detection roller (4) and the second humidity detection roller (5). A lead wire cavity (13) is opened in the middle of the interior of the first humidity detection roller (4) and the second humidity detection roller (5). A conductive bus (14) is provided inside the lead wire cavity (13). The conductive bus (14) is electrically connected to the multiple humidity detection probes (12). One end of the conductive bus (14) passes through the conductive bus (14) and is connected to an external power supply.

3. A calendering device for improving paper smoothness according to claim 2, characterized in that: The first humidifying nozzle (10) and the second humidifying nozzle (11) are both fixedly mounted on the spray plate (17). The upper ends of the two spray plates (17) are provided with infusion pipes (18). The ends of the two infusion pipes (18) away from the spray plate (17) are connected to the output port of the three-way valve (19). The input end of the three-way valve (19) is connected to the output end of the water pump (20). One end of the water pump (20) is connected to the storage tank (21). The storage tank (21) is fixedly mounted on the upper end of the calendering box (1).

4. A calendering device for improving paper smoothness according to claim 3, characterized in that: The first humidifying nozzle (10) and the second humidifying nozzle (11) at the bottom of the spray plate (17) are each evenly spaced and a solenoid valve is provided at the output port of each first humidifying nozzle (10) and the second humidifying nozzle (11).

5. A calendering device for improving paper smoothness according to claim 1, characterized in that: The calender box (1) has a collection trough (22) on the bottom side wall inside. The collection trough (22) is inclined and has a drain outlet at the inclined end. One end of the drain outlet is connected to a liquid collection tank (23). The liquid collection tank (23) has a liquid inlet channel (24) inside and a filter screen (33) inside the liquid inlet channel (24).

6. A calendering apparatus for improving paper smoothness according to claim 5, characterized in that: The liquid collection tank (23) is equipped with a circulating water pump (25). The output port of the circulating water pump (25) is connected to a water inlet disc (26). A rotating shaft (27) is rotatably arranged in the middle of the water inlet disc (26). Several sealing plates (28) are evenly spaced on the outer side wall of the rotating shaft (27). The side wall of the sealing plate (28) is slidably arranged with the inner side wall of the water inlet disc (26). The outer side wall of the sealing plate (28) is covered with a sealing rubber ring. A first connecting rod (29) is rotatably arranged at the outer end of the rotating shaft (27). A second connecting rod (30) is rotatably arranged at the upper end of the first connecting rod (29).

7. A calendering apparatus for improving paper smoothness according to claim 6, characterized in that: The second connecting rod (30) is slidably mounted on the sleeve (31). A cleaning rod (32) is fixedly mounted on the upper end of the second connecting rod (30). A cleaning brush (34) is fixedly mounted on the cleaning rod (32). One end of the cleaning brush (34) is in contact with the filter screen (33). A slag collection drawer (35) is provided at the bottom end of the liquid inlet channel (24).

8. A calendering apparatus for improving paper smoothness according to claim 6, characterized in that: A pressure sensor is embedded in the upper end of the tension detection roller (6), and the two ends of the adjustment roller (7) are rotatably mounted on the support frame (36). A rotating shaft (37) is fixedly mounted on one end of the support frame (36), and a gear (38) is connected to one end of the rotating shaft (37). A toothed plate (39) is meshed on one end of the gear (38), and one end of the toothed plate (39) is fixedly mounted on the telescopic end of the telescopic cylinder (40).

9. A calendering apparatus for improving paper smoothness according to claim 8, characterized in that: A support plate (41) is fixedly installed on the frame of the tension detection roller (6), the gear (38) is rotatably mounted on the support plate (41), and the rotating shaft (37) is rotatably connected to the support plate (41).

10. A calendering apparatus for improving paper smoothness according to claim 8, characterized in that: A control panel (42) is fixedly installed on the outer wall of the calender box (1). The control panel (42) is electrically connected to the humidity detection probe (12), the three-way valve (19), the solenoid valve, the circulating water pump (25), the pressure sensor and the telescopic cylinder (40).

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