Drying device for papermaking

Abstract

The utility model relates to a drying device for papermaking in the technical field of papermaking equipment, which comprises a drying box, and a drying component is arranged in the drying box along the direction from a feed port to a discharge port; the drying assembly comprises a plurality of upper drying cylinders and a plurality of lower drying cylinders, the upper drying cylinders and the lower drying cylinders are distributed in an up-down staggered mode, a circle of upper transmission drying belt is arranged on the upper drying cylinders, and a circle of lower transmission drying belt is arranged on the lower drying cylinders. A plurality of air nozzles are arranged at the bottom in the drying box and connected with an air guide pipe, the air guide pipe is connected with an air blower, a plurality of air suction holes are sequentially formed in the top in the drying box in the direction from the feeding port to the discharging port, the air suction holes are connected with an exhaust pipe, and the exhaust pipe is connected with an exhaust fan. The double-sided paper tape drying device is reasonable in structure, capable of performing double-sided drying operation on paper tapes, good in drying effect and high in efficiency; and water vapor generated by drying can be discharged in time, so that adverse effects on the paper are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of papermaking equipment, and in particular relates to a drying device for papermaking. Background Art

[0002] The drying process is the last process of the entire papermaking process. After several processes such as pulping, filtration, pulping, stirring, precipitation, and paper forming, the paper is dried by a drying device. In a general papermaking machine, the drying system adopts a steam drying cylinder. Patent document No. CN106906687B discloses a papermaking drying device, including a drying box, four drying devices are arranged inside the drying box, and the four drying devices all include a heating roller and a heating arc plate. The heating roller is provided with a first cavity inside, a metal pipe is provided inside the first cavity, and the metal pipe is surrounded by magnetic induction coils arranged at equal distances. The heating arc plate is provided with a second cavity inside, and the heating arc plate is provided with evenly distributed vents on one side of the heating arc plate close to the heating roller. A heater is provided on the lower surface of the drying box, and an exhaust transverse pipe is provided on the inner wall of the bottom of the drying box. The heater is connected to the exhaust transverse pipe through an air supply pipe, and an induced draft fan is provided inside the air supply pipe. The exhaust transverse pipe is provided with hot air outlets arranged at equal distances. In the patent, the contact area between the heating roller and the paper is limited, and the heating roller contacts the paper intermittently, resulting in poor drying uniformity and low efficiency. Therefore, a papermaking drying device is needed to solve the above technical problems. Utility Model Content

[0003] In view of the above-mentioned defects existing in the prior art, the utility model provides a drying device for papermaking, including a drying box, one end of the drying box is provided with a feed inlet, and the other end is provided with a discharge port, and a drying component is provided in the drying box along the direction from the feed inlet to the discharge port; the drying component includes a plurality of upper drying cylinders and a plurality of lower drying cylinders, the upper drying cylinders and the lower drying cylinders are staggered and distributed up and down, and the plurality of upper drying cylinders are connected with a drive one, the drive one includes a rotating motor one, and the rotating motor one is connected to one of the upper drying cylinders, and two adjacent upper drying cylinders are connected by a sprocket chain transmission that cooperates with each other, and the plurality of upper drying cylinders are provided with There is a circle of upper transmission drying belt, and the plurality of lower drying cylinders are connected with drive 2, the drive 2 includes rotating motor 2, the rotating motor 2 is connected with one of the lower drying cylinders, and the two adjacent lower drying cylinders are also connected through sprocket chain transmission that cooperate with each other, and a circle of lower transmission drying belt is arranged on the plurality of lower drying cylinders; the paper to be dried passes between the lower transmission drying belt and the upper transmission drying belt, the upper surface of the paper contacts with the upper transmission drying belt, and the lower surface of the paper contacts with the lower transmission drying belt, and the paper is dried by the lower transmission drying belt and the upper transmission drying belt during transmission, and the contact area is large and uniform, thereby improving the drying efficiency and drying effect.

[0004] The bottom of the drying box is provided with a plurality of nozzles in sequence along the direction from the feed inlet to the discharge port, and the plurality of nozzles are connected to an air duct, and the air duct is connected to a blower; the top of the drying box is provided with a plurality of exhaust holes in sequence along the direction from the feed inlet to the discharge port, and the exhaust holes are connected to an exhaust pipe, and the exhaust pipe is connected to an exhaust fan. During the drying process, the nozzles spray air to improve the air flow in the drying box and the drying evaporation efficiency. At the same time, the exhaust pipe extracts the evaporated water vapor in time to avoid the water vapor remaining and condensing in the drying box, thereby avoiding affecting the drying effect.

[0005] Preferably, a water squeezing assembly is provided in the drying box, the water squeezing assembly is arranged near the feed port, the water squeezing assembly comprises a lower rotating roller and an upper rotating roller arranged in parallel with each other, the lower rotating roller is parallel to the upper drying cylinder and the lower drying cylinder, both ends of the lower rotating roller are fixedly connected with a rotating shaft 1, the two rotating shafts 1 are rotatably connected to the inner wall of the drying box through bearings, one of the rotating shafts 1 is connected to a stepping motor after passing through the drying box, a water collecting tank is provided below the lower rotating roller, a water outlet pipe is provided on the water collecting tank, the water outlet pipe extends out of the drying box, both ends of the upper rotating roller are fixedly connected with a rotating shaft 2, the two rotating shafts 2 are rotatably connected to connecting blocks through bearings, and the two connecting blocks are connected to the top wall of the drying box through vertical telescopic rods. The arrangement of the water squeezing assembly can be achieved by the lower rotating roller and the upper rotating roller cooperating with each other, the upper rotating roller presses down to squeeze the passing paper, and the squeezed water flows into the water collecting tank to be processed. This setting can not only reduce the moisture content of paper and improve the efficiency of subsequent drying, but also flatten the paper, improving the flatness of the paper, which is beneficial to further improve the effective contact between the lower transmission drying belt and the upper transmission drying belt and the paper.

[0006] Preferably, the vertical telescopic rod is an electric push rod or a hydraulic rod.

[0007] Preferably, a transition roller is provided between the squeezing assembly and the drying assembly, the transition roller is parallel to the lower rotating roller, both ends of the transition roller are fixedly connected to a rotating shaft three, and the two rotating shafts three are rotatably connected to the inner wall of the drying box through bearings. The transition roller is conducive to the paper entering between the lower transmission drying belt and the upper transmission drying belt more smoothly, and effectively cooperates with the upper drying cylinder or the lower drying cylinder located at the front to improve the drying effect.

[0008] Preferably, the upper transmission drying belt is equipped with a plurality of upper heating rollers, the upper heating rollers and the upper drying cylinder are staggered and arranged vertically, and the upper transmission drying belt passes between the upper heating rollers and the upper drying cylinder. The upper heating rollers can heat and dry the upper transmission drying belt passing through, ensuring that the upper transmission drying belt in contact with the paper carries enough heat, thereby improving its drying effect on the paper. The upper heating roller can be an electric heating roller or a steam heating roller, which is a prior art, and its structure will not be described in detail.

[0009] Preferably, the lower transmission drying belt is equipped with a plurality of lower heating rollers, the lower heating rollers and the lower drying cylinder are staggered and arranged vertically, and the lower transmission drying belt passes between the lower heating rollers and the lower drying cylinder. The lower heating rollers can heat and dry the lower transmission drying belt passing through, ensuring that the lower transmission drying belt in contact with the paper carries enough heat, thereby improving its drying effect on the paper. The lower heating roller can be an electric heating roller or a steam heating roller, which is a prior art, and its structure will not be described in detail.

[0010] Preferably, the upper transmission drying belt and the lower transmission drying belt are canvas belts. The canvas belt is mainly used to press the paper and ensure that the paper is in reliable contact with the upper drying cylinder and the lower drying cylinder when the paper passes through the upper drying cylinder and the lower drying cylinder, so that the heat energy is effectively transferred to the paper and the moisture of the paper evaporates quickly.

[0011] Preferably, the upper drying cylinder and the lower drying cylinder are both provided with a heating chamber, and the upper drying cylinder and the lower drying cylinder are respectively provided with a medium inlet and a medium outlet at both ends. The medium inlet and the medium outlet are respectively connected to the corresponding medium inlet pipe or medium outlet pipe through a rotary joint, and steam is continuously introduced into the upper drying cylinder and the lower drying cylinder for heating to improve the drying effect.

[0012] The utility model also includes other components that enable a papermaking drying device to be used normally, such as a stepper motor control component, a blower control component, an electric push rod control component, a hydraulic rod control component, an exhaust fan control component, and a control component (such as an air pump) for controlling the continuous circulation of the heating medium in the upper drying cylinder and the lower drying cylinder, which are all conventional technical means in the field. In addition, the devices or components not limited in the utility model, such as electric push rods, hydraulic rods, glue spray heads, drying cylinders, tension springs, etc., all adopt conventional technical means and conventional equipment in the field.

[0013] The beneficial effects of the utility model are as follows: the structure is reasonable, and the double-sided drying operation can be performed on the paper tape. During the drying process, the contact area between the paper and the canvas tape is large and uniform, which improves the drying effect and efficiency; the water vapor generated by the drying can be discharged in time without causing adverse effects on the paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic structural diagram of a papermaking drying device in Example 1 of the utility model;

[0016] Figure 2 This is a schematic structural diagram of a papermaking drying device in Example 2 of the utility model.

[0017] In the figure: 1. drying box; 2. feeding port; 3. lower rotating roller; 4. water collecting box; 5. upper rotating roller; 6. connecting block; 7. vertical telescopic rod; 8. paper; 9. transition roller; 10. lower drying cylinder; 11. lower transmission drying belt; 12. air guide pipe; 13. nozzle; 14. upper transmission drying belt; 15. upper drying cylinder; 16. exhaust hole; 17. exhaust pipe; 18. upper heating roller; 19. lower heating roller. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.

[0019] Example 1

[0020] like Figure 1 As shown, the utility model provides a drying device for papermaking, including a drying box 1, one end of the drying box 1 is provided with a feed port 2, and the other end is provided with a discharge port, and a drying component is provided in the drying box 1 along the direction from the feed port 2 to the discharge port; the drying component includes a plurality of upper drying cylinders 15 and a plurality of lower drying cylinders 10, and the upper drying cylinders 15 and the lower drying cylinders 10 are staggered and distributed up and down, and the plurality of upper drying cylinders are connected with a drive 1, and the drive 1 includes a rotating motor 1, and the rotating motor 1 is connected to one of the upper drying cylinders, and the adjacent two upper drying cylinders are connected by a sprocket chain transmission that cooperates with each other, and the plurality of upper drying cylinders 15 are provided with a circle of upper transmission drying Belt 14, multiple lower drying cylinders are connected with drive 2, and the drive 2 includes rotating motor 2, and the rotating motor 2 is connected to one of the lower drying cylinders. Two adjacent lower drying cylinders are also connected through sprocket chain transmissions that cooperate with each other. Multiple lower drying cylinders 10 are provided with a circle of lower transmission drying belt 11; the paper 8 to be dried passes between the lower transmission drying belt 11 and the upper transmission drying belt 14, the upper surface of the paper 8 contacts the upper transmission drying belt 14, and the lower surface of the paper 8 contacts the lower transmission drying belt 11. The paper 8 is dried by the lower transmission drying belt 11 and the upper transmission drying belt 14 during transmission, and the contact area is large and uniform, thereby improving the drying efficiency and drying effect.

[0021] The bottom of the drying box 1 is provided with a plurality of nozzles 13 in sequence along the direction from the feed inlet 2 to the discharge port, and the plurality of nozzles 13 are connected to an air duct 12, and the air duct 12 is connected to a blower; the top of the drying box 1 is provided with a plurality of exhaust holes 16 in sequence along the direction from the feed inlet 2 to the discharge port, and the exhaust holes 16 are connected to an exhaust pipe 17, and the exhaust pipe 17 is connected to an exhaust fan. During the drying process, the nozzles 13 spray air to improve the air flow in the drying box 1 and the drying evaporation efficiency. At the same time, the exhaust pipe 17 extracts the evaporated water vapor in time to avoid the water vapor remaining in the drying box 1 and condensing, thereby avoiding affecting the drying effect.

[0022] The drying box 1 is provided with a squeezing assembly, which is arranged near the feed port 2. The squeezing assembly includes a lower rotating roller 3 and an upper rotating roller 5 arranged in parallel with each other. The lower rotating roller 3 is parallel to the upper drying cylinder 15 and the lower drying cylinder 10. Both ends of the lower rotating roller 3 are fixedly connected with a rotating shaft 1. The two rotating shafts 1 are rotatably connected to the inner wall of the drying box 1 through bearings. One of the rotating shafts 1 is connected to a stepping motor after passing through the drying box. A water collecting tank is provided below the lower rotating roller 3. The water collecting tank is provided with a water outlet pipe, and the water outlet pipe extends out of the drying box 1. Both ends of the upper rotating roller 5 are fixedly connected with a rotating shaft 2. The two rotating shafts 2 are rotatably connected to connecting blocks 6 through bearings, and the two connecting blocks 6 are connected to the top wall of the drying box through vertical telescopic rods 7. The squeezing assembly can be arranged by the lower rotating roller 3 and the upper rotating roller 5 cooperating with each other. The upper rotating roller 5 presses down to squeeze the passing paper 8, and the squeezed water flows into the water collecting tank 4 to be processed. This arrangement can not only reduce the moisture content of the paper 8 and improve the efficiency of subsequent drying, but also flatten the paper 8, thereby improving the flatness of the paper 8, which is beneficial to further improve the effective contact between the lower transmission drying belt 11 and the upper transmission drying belt 14 and the paper 8.

[0023] The vertical telescopic rod 7 is an electric push rod or a hydraulic rod.

[0024] A transition roller 9 is provided between the squeezing assembly and the drying assembly, the transition roller 9 is parallel to the lower rotating roller 3, both ends of the transition roller 9 are fixedly connected with a rotating shaft 3, and the two rotating shafts 3 are rotatably connected to the inner wall of the drying box 1 through bearings. The transition roller 9 is conducive to the paper 8 entering between the lower transmission drying belt 11 and the upper transmission drying belt 14 more smoothly, and effectively cooperates with the upper drying cylinder 15 or the lower drying cylinder 10 located at the front to improve the drying effect.

[0025] The upper transmission drying belt 14 and the lower transmission drying belt 11 are both canvas belts. The canvas belts are mainly used to press the paper 8 and ensure that the paper 8 is in reliable contact with the upper drying cylinder 15 and the lower drying cylinder 10 when the paper 8 passes through the upper drying cylinder 15 and the lower drying cylinder 10, so that heat energy is effectively transferred to the paper 8, so that the water of the paper 8 evaporates quickly.

[0026] The upper drying cylinder 15 and the lower drying cylinder 10 are both provided with a heating chamber, and the upper drying cylinder 15 and the lower drying cylinder 10 are respectively provided with a medium inlet and a medium outlet at both ends. The medium inlet and the medium outlet are respectively connected to the corresponding medium inlet pipe or medium outlet pipe through a rotary joint, and steam is continuously introduced into the upper drying cylinder 15 and the lower drying cylinder 10 for heating to improve the drying effect.

[0027] Working principle: The paper to be dried enters the drying box from the feed port, and is squeezed by the upper and lower rollers to reduce the water content of the paper. After squeezing, the dryness of the paper is only 50%, and then enters between the lower transmission drying belt and the upper transmission drying belt under the transition of the transition roller. The upper surface of the paper contacts the upper transmission drying belt, and the lower surface of the paper contacts the lower transmission drying belt. The paper is dried by the lower transmission drying belt and the upper transmission drying belt during transmission, and the dryness reaches 92%. In the above process, the contact area between the lower transmission drying belt, the upper transmission drying belt and the paper is large and uniform, and when the paper passes through the upper and lower drying cylinders, it is ensured that it is in reliable contact with the upper and lower drying cylinders, so that the heat energy is effectively transferred to the paper, so that the water content of the paper evaporates quickly, improving the drying efficiency and drying effect.

[0028] Example 2

[0029] like Figure 2 As shown, the utility model provides a drying device for papermaking, including a drying box 1, one end of the drying box 1 is provided with a feed port 2, and the other end is provided with a discharge port, and a drying component is provided in the drying box 1 along the direction from the feed port 2 to the discharge port; the drying component includes a plurality of upper drying cylinders 15 and a plurality of lower drying cylinders 10, and the upper drying cylinders 15 and the lower drying cylinders 10 are staggered and distributed up and down, and the plurality of upper drying cylinders are connected with a drive 1, and the drive 1 includes a rotating motor 1, and the rotating motor 1 is connected to one of the upper drying cylinders, and the adjacent two upper drying cylinders are connected by a sprocket chain transmission that cooperates with each other, and the plurality of upper drying cylinders 15 are provided with a circle of upper transmission drying Belt 14, multiple lower drying cylinders are connected with drive 2, and the drive 2 includes rotating motor 2, and the rotating motor 2 is connected to one of the lower drying cylinders. Two adjacent lower drying cylinders are also connected through sprocket chain transmissions that cooperate with each other. Multiple lower drying cylinders 10 are provided with a circle of lower transmission drying belt 11; the paper 8 to be dried passes between the lower transmission drying belt 11 and the upper transmission drying belt 14, the upper surface of the paper 8 contacts the upper transmission drying belt 14, and the lower surface of the paper 8 contacts the lower transmission drying belt 11. The paper 8 is dried by the lower transmission drying belt 11 and the upper transmission drying belt 14 during transmission, and the contact area is large and uniform, thereby improving the drying efficiency and drying effect.

[0030] The bottom of the drying box 1 is provided with a plurality of nozzles 13 in sequence along the direction from the feed inlet 2 to the discharge port, and the plurality of nozzles 13 are connected to an air duct 12, and the air duct 12 is connected to a blower; the top of the drying box 1 is provided with a plurality of exhaust holes 16 in sequence along the direction from the feed inlet 2 to the discharge port, and the exhaust holes 16 are connected to an exhaust pipe 17, and the exhaust pipe 17 is connected to an exhaust fan. During the drying process, the nozzles 13 spray air to improve the air flow in the drying box 1 and the drying evaporation efficiency. At the same time, the exhaust pipe 17 extracts the evaporated water vapor in time to avoid the water vapor remaining in the drying box 1 and condensing, thereby avoiding affecting the drying effect.

[0031] The drying box 1 is provided with a squeezing assembly, which is arranged near the feed port 2. The squeezing assembly includes a lower rotating roller 3 and an upper rotating roller 5 arranged in parallel with each other. The lower rotating roller 3 is parallel to the upper drying cylinder 15 and the lower drying cylinder 10. Both ends of the lower rotating roller 3 are fixedly connected with a rotating shaft 1. The two rotating shafts 1 are rotatably connected to the inner wall of the drying box 1 through bearings. One of the rotating shafts 1 is connected to a stepping motor after passing through the drying box. A water collecting tank is provided below the lower rotating roller 3. The water collecting tank is provided with a water outlet pipe, and the water outlet pipe extends out of the drying box 1. Both ends of the upper rotating roller 5 are fixedly connected with a rotating shaft 2. The two rotating shafts 2 are rotatably connected to connecting blocks 6 through bearings, and the two connecting blocks 6 are connected to the top wall of the drying box through vertical telescopic rods 7. The squeezing assembly can be arranged by the lower rotating roller 3 and the upper rotating roller 5 cooperating with each other. The upper rotating roller 5 presses down to squeeze the passing paper 8, and the squeezed water flows into the water collecting tank 4 to be processed. This arrangement can not only reduce the moisture content of the paper 8 and improve the efficiency of subsequent drying, but also flatten the paper 8, thereby improving the flatness of the paper 8, which is beneficial to further improve the effective contact between the lower transmission drying belt 11 and the upper transmission drying belt 14 and the paper 8.

[0032] The vertical telescopic rod 7 is an electric push rod or a hydraulic rod.

[0033] A transition roller 9 is provided between the squeezing assembly and the drying assembly, the transition roller 9 is parallel to the lower rotating roller 3, both ends of the transition roller 9 are fixedly connected with a rotating shaft 3, and the two rotating shafts 3 are rotatably connected to the inner wall of the drying box 1 through bearings. The transition roller 9 is conducive to the paper 8 entering between the lower transmission drying belt 11 and the upper transmission drying belt 14 more smoothly, and effectively cooperates with the upper drying cylinder 15 or the lower drying cylinder 10 located at the front to improve the drying effect.

[0034] The upper transmission drying belt 14 is equipped with a plurality of upper heating rollers 18, which are arranged alternately with the upper drying cylinder 15, and the upper transmission drying belt 14 passes between the upper heating rollers 18 and the upper drying cylinder 15. The upper heating rollers 18 can heat and dry the passing upper transmission drying belt 14, ensuring that the upper transmission drying belt in contact with the paper 8 carries enough heat, thereby improving its drying effect on the paper 8. The upper heating rollers 18 can be electric heating rollers or steam heating rollers, which are prior art, and their structure will not be described in detail.

[0035] The lower transmission drying belt 11 is matched with a plurality of lower heating rollers 19, and the lower heating rollers 19 and the lower drying cylinder 10 are arranged in an interlaced manner, and the lower transmission drying belt 11 passes between the lower heating rollers 19 and the lower drying cylinder 10. The lower heating rollers 19 can heat and dry the lower transmission drying belt 11 passing through, ensuring that the lower transmission drying belt in contact with the paper 8 carries enough heat, thereby improving its drying effect on the paper 8. The lower heating rollers 19 can be electric heating rollers or steam heating rollers, which are prior art, and their structure will not be described in detail.

[0036] The upper transmission drying belt 14 and the lower transmission drying belt 11 are both canvas belts. The canvas belts are mainly used to press the paper 8 and ensure that the paper 8 is in reliable contact with the upper drying cylinder 15 and the lower drying cylinder 10 when the paper 8 passes through the upper drying cylinder 15 and the lower drying cylinder 10, so that heat energy is effectively transferred to the paper 8, so that the water of the paper 8 evaporates quickly.

[0037] The upper drying cylinder 15 and the lower drying cylinder 10 are both provided with a heating chamber, and the upper drying cylinder 15 and the lower drying cylinder 10 are respectively provided with a medium inlet and a medium outlet at both ends. The medium inlet and the medium outlet are respectively connected to the corresponding medium inlet pipe or medium outlet pipe through a rotary joint, and steam is continuously introduced into the upper drying cylinder 15 and the lower drying cylinder 10 for heating to improve the drying effect.

[0038] Working principle: The paper to be dried enters the drying box from the feed port, and is squeezed by the upper and lower rollers to reduce the water content of the paper. After squeezing, the dryness of the paper is only 50%, and then enters between the lower transmission drying belt and the upper transmission drying belt under the transition of the transition roller. The upper surface of the paper contacts the upper transmission drying belt, and the lower surface of the paper contacts the lower transmission drying belt. The paper is dried by the lower transmission drying belt and the upper transmission drying belt during transmission, and the dryness reaches 92%. In the above process, the contact area between the lower transmission drying belt, the upper transmission drying belt and the paper is large and uniform, and when the paper passes through the upper and lower drying cylinders, it is ensured that it is in reliable contact with the upper and lower drying cylinders, so that the heat energy is effectively transferred to the paper, so that the water content of the paper evaporates quickly, improving the drying efficiency and drying effect.

[0039] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A drying device for papermaking, comprising a drying box, wherein one end of the drying box is provided with a feed inlet, the other end is provided with a discharge outlet, and a drying assembly is provided in the drying box along the direction from the feed inlet to the discharge outlet; characterized in that: The drying assembly comprises a plurality of upper drying cylinders and a plurality of lower drying cylinders, wherein the upper drying cylinders and the lower drying cylinders are staggered and arranged vertically, a circle of upper transmission drying belts are arranged on the plurality of upper drying cylinders, and a circle of lower transmission drying belts are arranged on the plurality of lower drying cylinders; A plurality of nozzles are sequentially arranged at the bottom of the drying box along the direction from the feed inlet to the discharge port, the plurality of nozzles are connected to an air duct, and the air duct is connected to a blower; a plurality of exhaust holes are sequentially arranged at the top of the drying box along the direction from the feed inlet to the discharge port, the exhaust holes are connected to an exhaust pipe, and the exhaust pipe is connected to an exhaust fan.

2. A papermaking drying device according to claim 1, characterized in that: A water squeezing assembly is provided in the drying box, and the water squeezing assembly is arranged near the feed port. The water squeezing assembly includes a lower rotating roller and an upper rotating roller arranged parallel to each other, and the lower rotating roller is parallel to the upper drying cylinder and the lower drying cylinder. Both ends of the lower rotating roller are fixedly connected with a rotating shaft 1, and the two rotating shafts 1 are rotatably connected to the inner wall of the drying box through bearings. One of the rotating shafts 1 passes through the drying box and is connected to a stepper motor. A water collecting trough is provided below the lower rotating roller, and a water outlet pipe is provided on the water collecting trough, and the water outlet pipe extends out of the drying box. Both ends of the upper rotating roller are fixedly connected with a rotating shaft 2, and the two rotating shafts 2 are rotatably connected to connecting blocks through bearings, and the two connecting blocks are respectively connected to the top wall of the drying box through vertical telescopic rods.

3. A papermaking drying device according to claim 2, characterized in that: The vertical telescopic rod is an electric push rod or a hydraulic rod.

4. A papermaking drying device according to claim 2, characterized in that: A transition roller is provided between the water squeezing assembly and the drying assembly. The transition roller is parallel to the lower rotating roller. Both ends of the transition roller are fixedly connected with a rotating shaft three. The two rotating shafts three are rotatably connected to the inner wall of the drying box through bearings.

5. A papermaking drying device according to claim 1, characterized in that: The upper transmission drying belt is matched with a plurality of upper heating rollers, the upper heating rollers and the upper drying cylinders are staggered and arranged vertically, and the upper transmission drying belt passes between the upper heating rollers and the upper drying cylinders.

6. A papermaking drying device according to claim 1, characterized in that: The lower transmission drying belt is matched with a plurality of lower heating rollers, the lower heating rollers and the lower drying cylinders are staggered and distributed up and down, and the lower transmission drying belt passes between the lower heating rollers and the lower drying cylinders.

7. A papermaking drying device according to claim 1, characterized in that: The upper transmission drying belt and the lower transmission drying belt are both canvas belts.

8. A papermaking drying device according to claim 1, characterized in that: The upper drying cylinder and the lower drying cylinder are both provided with a heating cavity, and the two ends of the upper drying cylinder and the lower drying cylinder are respectively provided with a medium inlet and a medium outlet.

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