A continuous drying equipment for coated paper production

Abstract

This invention relates to the field of drying equipment technology, and in particular to a continuous drying device for coated paper production. The device includes a support frame on which a drying roller, a cooling roller, and a transfer roller are rotatably mounted. The transfer roller is located between the drying roller and the cooling roller. The drying roller is hollow, and an intermediate cylinder is located inside it. A steam pipe and a water extraction pipe are respectively located at both ends of the intermediate cylinder. The intermediate cylinder is coaxially rotatably connected to the drying roller via the steam pipe and the water extraction pipe. The steam pipe is used to introduce steam into the intermediate cylinder, and the water extraction pipe is used to extract condensate accumulated at the bottom of the intermediate cylinder. The continuous drying device for coated paper production provided by this invention can reduce the impact of condensate on the siphon pipe (water extraction pipe), thereby reducing the impact on the drying roller and minimizing the impact on the quality of coated paper production.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and specifically to a continuous drying equipment for the production of coated paper. Background Technology

[0002] During the production process of coated paper, after the PE plastic film is coated, the coated paper needs to be dried to accelerate the curing of the PE plastic film.

[0003] In existing technologies, coated paper can be dried using steam. Specifically, during the processing of coated paper, a steam-injected drying roller is used to transfer the PE plastic film-coated coated paper. During this transfer, the drying roller dries the coated paper. Furthermore, to prevent condensation from accumulating inside the drying roller, existing technologies also incorporate a siphon tube to remove water from the roller, thereby reducing the impact of condensation on the roller's rotation.

[0004] Referring to the existing Chinese patent document CN2667271Y, entitled "Drying Cylinder Siphon Tube Connector," which relates to a fixed condensate drainage device for drying cylinders in the papermaking industry, the background art describes several existing condensate drainage devices capable of extracting condensate from the drying roll. One such device includes a fixed siphon tube connected by a fixed elbow. This siphon tube mainly consists of a vertical siphon tube and a horizontal siphon tube. The vertical siphon tube is used for drainage from the drying roll. When the drying roll using this siphon tube rotates, the condensate ring adhering to the inner wall of the drying roll exerts an unstable hydraulic impact on the head of the vertical siphon tube near the inner wall. Under prolonged hydraulic impact when the condensate ring is damaged, the siphon tube is easily damaged. Simultaneously, prolonged impact can also damage the rotating joint of the drying roll, thus affecting the normal rotation of the drying roll.

[0005] Abnormal rotation of the drying roller may cause the coated paper it conveys to twist or fold, affecting the normal production of coated paper. Summary of the Invention

[0006] This invention provides a continuous drying device for coated paper production, which can reduce the impact of condensate on the siphon pipe (water pumping pipe), thereby reducing the impact on the drying roller and the quality of coated paper production.

[0007] The continuous drying equipment for producing coated paper according to the present invention adopts the following technical solution:

[0008] A continuous drying device for producing coated paper includes a support frame. A drying roller, a cooling roller, and a transfer roller are rotatably mounted on the support frame. The transfer roller is located between the drying roller and the cooling roller. The drying roller is hollow and has an intermediate cylinder inside. A steam pipe and a water extraction pipe are respectively provided at both ends of the intermediate cylinder. The intermediate cylinder is coaxially rotatably connected to the drying roller through the steam pipe and the water extraction pipe. The steam pipe is used to introduce steam into the intermediate cylinder, and the water extraction pipe is used to extract condensate accumulated at the bottom of the intermediate cylinder.

[0009] Furthermore, the intermediate cylinder is provided with a spiral guide plate. When the intermediate cylinder rotates with the drying roller, the spiral guide plate is configured to transport the condensate near the steam pipe to the side near the pumping pipe.

[0010] Furthermore, one end of the water pump extends into the intermediate cylinder near the side of the intermediate cylinder where the water pump is located.

[0011] Furthermore, there is a gap between the outer wall of the intermediate cylinder and the inner wall of the drying roller, and the gap between the intermediate cylinder and the drying roller forms a water film cavity. Air guide holes and flow guide holes are respectively opened at both ends of the intermediate cylinder, and the water film cavity communicates with the air guide holes and the flow guide holes.

[0012] Furthermore, an installation pipe is fixed to the end of the intermediate cylinder away from the steam pipe, and the water pumping pipe is inserted into the installation pipe;

[0013] A stabilizing mechanism is provided between the mounting pipe and the pumping pipe to stabilize the rotation speed of the drying roller. The stabilizing mechanism includes a conical cylinder, a fixed pipe, and a friction block. The conical cylinder is sleeved on the mounting pipe, with its small end facing the drying roller. The fixed pipe includes a straight pipe and a convex ring. The convex ring is sleeved on the straight pipe and integrally formed with it. The straight pipe is sleeved on the pumping pipe. The friction block is movably disposed in the cavity formed by the fixed pipe and the conical cylinder. The friction block is always in contact with the side of the convex ring facing the drying roller by an elastic element.

[0014] Furthermore, the elastic element is a compression spring, which is sleeved on the mounting tube and the straight tube, with its two ends respectively abutting against the end plate on the small end side of the conical cylinder and the friction block.

[0015] Furthermore, the transfer roller is a hollow roller, and air holes are opened on the roller surface. A vacuum pumping device is provided on the support, and the vacuum pumping device is configured to draw negative pressure into the transfer roller through the air holes.

[0016] Furthermore, multiple air holes are provided, and the multiple air holes are evenly distributed on the roller surface of the transfer roller.

[0017] Furthermore, the cooling roller is a hollow roller, and the cooling roller is connected to a cooling pump, which is configured to deliver a cooling medium into the cooling roller.

[0018] Furthermore, the water pumping pipe is a rigid pipe.

[0019] The beneficial effects of this invention are:

[0020] The present invention provides a continuous drying device for producing coated paper. An intermediate cylinder rotatably disposed inside the drying roller is independent of the drying roller. Steam is introduced into the intermediate cylinder through a steam pipe. The intermediate cylinder is heated and can transfer heat to the drying roller to heat the drying roller. When the drying roller rotates, it can dry the coated paper being transported.

[0021] In this invention, because the pumping pipe is directly inserted into the intermediate cylinder, the condensate formed after steam cooling is located inside the intermediate cylinder. Furthermore, since the intermediate cylinder and the drying roller are independent of each other, even if the intermediate cylinder rotates with the drying roller, its rotational speed relative to the drying roller is lower. The lower rotational speed of the condensate in the intermediate cylinder results in a lesser impact force on the pumping pipe compared to the impact force of condensate on the siphon pipe in existing technologies. Moreover, the impact of the condensate ring on the pumping pipe is less likely to affect the normal rotation of the drying roller due to the independence of the intermediate cylinder and the drying roller, thus maintaining a relatively stable rotational speed of the drying roller. Coated paper produced using a drying roller with a stable rotational speed is less prone to twisting, tearing, or folding, resulting in better quality.

[0022] Furthermore, the spiral guide plate installed inside the intermediate cylinder can accelerate the flow of condensate in the intermediate cylinder towards the end of the intermediate cylinder near the drain pipe, thereby allowing the condensate in the intermediate cylinder to accumulate more quickly at the end near the drain pipe. This allows the condensate to be discharged from the intermediate cylinder more quickly through the drain pipe. This not only reduces the impact of condensate on the temperature of the intermediate cylinder, which is beneficial for maintaining the continuous high temperature of the intermediate cylinder, but also quickly reduces the amount of condensate in the intermediate cylinder. This means that even if the condensate rotates with the intermediate cylinder, the impact force that the condensate can generate on the drain pipe will be smaller.

[0023] In addition, the spiral guide plate can keep the temperature of the drying roller relatively stable, which is beneficial for the long-term drying of coated paper. The long-term high temperature in the intermediate drum can also reduce the amount of steam liquefying into condensate. This not only reduces the waste of steam, but also further reduces the amount of condensate generated in the intermediate drum, and further reduces the impact of condensate on the pumping pipe.

[0024] Furthermore, the water film cavity formed by the gap between the drying roller and the intermediate cylinder can connect the intermediate cylinder and the drying roller through the air guide hole and the flow guide hole. Not only can steam flow into the drying roller from the air guide hole and the flow guide hole, but condensate can also flow into the drying roller from the air guide hole and the flow guide hole. The steam flowing into the drying roller can heat the condensate in the drying roller into high-temperature condensate. The high-temperature condensate and steam enter the gap between the drying roller and the intermediate cylinder and can form a water film layer in the gap. Since the specific heat capacity of water is much larger than that of metal, the temperature change of the water film layer will not be too large when steam is continuously introduced. This makes the drying roller more stable and uniform in heating, reducing the difficulty of uniform drying of coated paper due to large temperature differences in different areas of the drying roller when drying coated paper, resulting in better quality coated paper produced.

[0025] Moreover, the steam first enters the intermediate cylinder and then enters the drying roller through the guide holes and air guide holes. Compared with the existing technology that directly introduces steam into the drying roller, the steam can cause less impact on the drying roller, which helps the drying roller rotate stably. Furthermore, the water film layer formed in the gap between the drying roller and the intermediate cylinder can also re-enter the intermediate cylinder through the guide holes and air guide holes, which can keep the condensate in the drying roller within a stable range. Stable condensate in the drying roller also helps the drying roller rotate stably.

[0026] Furthermore, the stabilizing mechanism can limit the rotation speed of the intermediate cylinder. When there is less condensate in the intermediate cylinder, the drying roller drives the intermediate cylinder to rotate at a higher speed through the water film layer. At the same time, the centrifugal force on the friction block in the stabilizing mechanism is greater, which makes the friction block contact the convex ring on the fixed tube more tightly, thereby reducing the rotation speed of the intermediate cylinder and increasing the adhesion between the drying roller and the intermediate cylinder, thus reducing the rotation speed of the drying roller. When there is more condensate in the intermediate cylinder, the rotation speed of the intermediate cylinder driven by the drying roller through the water film layer is smaller, the centrifugal force on the friction block in the stabilizing mechanism is smaller, and the contact between the friction block and the convex ring on the fixed tube is not tight, which has less impact on the rotation speed of the intermediate cylinder. At this time, the adhesion between the drying roller and the intermediate cylinder is larger, and the adhesion can reduce the rotation speed of the drying roller. Thus, regardless of the amount of condensate in the intermediate cylinder, the rotation speed of the drying roller is always kept within a suitable range, the rotation speed is relatively stable, and there will be no large changes, resulting in better quality coated paper. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a continuous drying equipment for producing coated paper, provided in an embodiment of the present invention;

[0029] Figure 2 This is a front view of a continuous drying device for producing coated paper, provided in an embodiment of the present invention.

[0030] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure along the AA direction;

[0031] Figure 4 for Figure 3 A magnified structural diagram of part B in the middle section;

[0032] Figure 5 for Figure 3 A magnified structural diagram of section C;

[0033] Figure 6 This is a top view of a continuous drying equipment for producing coated paper, provided in an embodiment of the present invention.

[0034] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure along the DD direction;

[0035] Figure 8 This is a side view of a continuous drying device for producing coated paper, provided in an embodiment of the present invention.

[0036] Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure along the EE direction;

[0037] Figure 10 for Figure 9 A magnified structural diagram of section F in the middle.

[0038] In the diagram: 100, drying roller; 101, coated paper; 200, cooling roller; 300, transfer roller; 310, air hole; 400, intermediate cylinder; 401, air guide hole; 402, flow guide hole; 410, steam pipe; 420, water pumping pipe; 421, reinforcing sleeve; 430, spiral guide plate; 500, water film cavity; 440, mounting pipe; 600, stabilizing mechanism; 610, conical cylinder; 620, cylinder cover; 630, fixing pipe; 640, friction block; 650, limiting plate; 631, convex ring; 632, straight pipe; 633, compression spring. Detailed Implementation

[0039] 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.

[0040] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0041] like Figures 1 to 5 As shown, a continuous drying device for coated paper production includes a support frame, on which a drying roller 100, a cooling roller 200, and a transfer roller 300 are rotatably mounted. The drying roller 100 receives the processed coated paper 101, which still contains moisture. The transfer roller 300 is located between the drying roller 100 and the cooling roller 200, and receives the coated paper 101 conveyed from the drying roller 100. The coated paper 101 received by the transfer roller 300 is dried under the drying action of the drying roller 100. The cooling roller 200 receives the coated paper 101 conveyed from the transfer roller 300. The cooling roller 200 cools the heated coated paper 101 during conveying, so that the plastic film (or composite film) of the coated paper 101 bonds more tightly to the paper sheet.

[0042] The drying roller 100 is hollow, and an intermediate cylinder 400 is provided inside the drying roller 100. The intermediate cylinder 400 is a hollow cylinder, and a steam pipe 410 and a water suction pipe 420 are respectively provided at both ends of the intermediate cylinder 400. A reinforcing sleeve 421 can be fitted onto the water suction pipe 420, and the reinforcing sleeve 421 is fixedly connected to the water suction pipe 420. The intermediate cylinder 400 is rotatably mounted inside the drying roller 100 through the steam pipe 410 and the water suction pipe 420 (reinforcing sleeve 421). The intermediate cylinder 400, the steam pipe 410, and the reinforcing sleeve 421 are all coaxially arranged with the drying roller 100.

[0043] Specifically, the end shaft of the drying roller 100 can be a hollow shaft coaxially arranged with the drying roller 100, and the rotating shafts at both ends of the intermediate cylinder 400 can be hollow shafts coaxially arranged with the intermediate cylinder 400. The intermediate cylinder 400 is located inside the drying roller 100, with one end of its hollow shaft inserted into the other end of the drying roller 100, and the other end of its hollow shaft inserted into the other end of the drying roller 100. There is no direct, fixed connection between the intermediate cylinder 400 and the drying roller 100 within the drying roller 100. When the drying roller 100 rotates, the intermediate cylinder 400 can be rotated through the part of the drying roller 100 in contact with the intermediate cylinder 400, and the direction of rotation of the intermediate cylinder 400 is the same as the direction of rotation of the drying roller 100.

[0044] The steam pipe 410 can be a hollow shaft fixed to the end of the intermediate cylinder 400, used to introduce steam into the intermediate cylinder 400. Alternatively, if the end shaft of the intermediate cylinder 400 is too short to be inserted into the end shaft of the drying roller 100, the steam pipe 410 can be inserted into the end shaft of the drying roller 100 and rotatably connected to it. The end of the steam pipe 410 away from the intermediate cylinder 400 extends from the corresponding drying roller 100 shaft and can be connected to a steam supply device located outside the invention. The connection between the output end of the external steam supply device and the steam pipe 410 is a rotatable connection. This rotatable connection between the output end of the external steam supply device and the steam pipe 410 prevents the external steam supply device from being affected by the rotation of the intermediate cylinder 400, thus preventing the external steam supply device from tipping over. The external steam supply device can be a boiler, with its steam output end rotatably connected to the steam pipe 410 via a sealed bearing.

[0045] The water suction pipe 420 is a rigid pipe. It passes through the rotating shaft at the end of the intermediate cylinder 400 furthest from the steam pipe 410, and is rotatably connected to this shaft. Similarly, if the rotating shaft at the end of the intermediate cylinder 400 is too short to be inserted into the end roller shaft of the drying roller 100, the water suction pipe 420 can be directly inserted into the end roller shaft of the drying roller 100 and rotatably connected to it. One end of the water suction pipe 420 extending into the intermediate cylinder 400 is near the bottom of the cylinder. The end of the water suction pipe 420 furthest from the intermediate cylinder 400 can be connected to a water pump, which can be a water pump. The water pump can use the water suction pipe 420 to remove the condensate accumulated at the bottom of the intermediate cylinder 400.

[0046] When the intermediate cylinder 400 rotates, the external steam supply equipment and water pumping mechanism at both ends of the intermediate cylinder 400 do not rotate with the rotation of the intermediate cylinder 400.

[0047] The operating principle of this invention is as follows:

[0048] First, the coated paper 101 to be dried is drawn out from the previous processing step, goes around the top of the drying roller 100 and is drawn down, then goes around the lower roller surface of the transfer roller 300 and is drawn up, and then goes around the upper roller surface of the cooling roller 200 to the winding process or other processing steps of the coated paper 101.

[0049] While the coated paper 101 is conveyed on each roller, steam is introduced into the steam pipe 410 through an external steam supply device. The steam heats the wall of the intermediate cylinder 400, which in turn heats the drying roller 100. The heated drying roller 100 heats the coated paper 101, thus drying it. Afterward, the coated paper 101 is conveyed to the subsequent process of this invention via the transfer roller 300 and the cooling roller 200.

[0050] When the coated paper 101 passes through the transfer roller 300, the transfer roller 300 holds the coated paper 101 taut, thereby keeping the coated paper 101 taut. When the coated paper 101 passes through the cooling roller 200, the cooling roller 200 cools the coated paper 101, making the coated paper 101 more suitable for storage.

[0051] After the coated paper 101 is conveyed on the present invention for a period of time, the water vapor introduced into the intermediate cylinder 400 will gradually condense into small water droplets due to heat loss, and then flow to the bottom of the intermediate cylinder 400. When a certain amount of condensate accumulates at the bottom of the intermediate cylinder 400, the condensate accumulated in the intermediate cylinder 400 is pumped out of the intermediate cylinder 400 through the water pumping pipe 420, thereby maintaining the high temperature of the intermediate cylinder 400.

[0052] Since the water pumping pipe 420 is directly installed inside the intermediate cylinder 400, and the intermediate cylinder 400 is relatively independent from the drying roller 100, even if the condensate in the intermediate cylinder 400 impacts the water pumping pipe 420, it has virtually no effect on the rotation speed of the drying roller 100. Therefore, the rotation speed of the drying roller 100 will remain relatively stable, which makes it less likely that the coated paper 101 will be twisted or bent due to abnormal rotation speed of the drying roller 100 when the drying roller 100 is conveying the coated paper 101, thus enabling the production of coated paper 101 with better quality.

[0053] Furthermore, even if the intermediate cylinder 400 rotates with the drying roller 100, the rotational speed of the intermediate cylinder 400 relative to the drying roller 100 is lower. The impact force exerted by the condensate ring on the suction pipe 420 due to its lower rotational speed is less than the impact force exerted by the condensate ring on the siphon pipe in the prior art. The lower impact force has less impact on the rotation of the drying roller 100, which is beneficial for maintaining the stable rotational speed of the drying roller 100 and for producing high-quality coated paper 101.

[0054] In some embodiments, a spiral guide plate 430 is provided inside the intermediate cylinder 400. When the intermediate cylinder 400 rotates with the drying roller 100, the spiral guide plate 430 is used to transport the condensate near the steam pipe 410 to the side near the pumping pipe 420.

[0055] The spiral guide plate 430 can be a spiral ring similar to a spiral blade structure. The spiral guide plate 430 is defined such that when the intermediate cylinder 400 rotates, the steam introduced into the intermediate cylinder 400 from the steam pipe 410 can flow away from the steam pipe 410 after condensation under the guidance of the spiral guide plate 430, that is, flow towards the end closer to the water pumping pipe 420.

[0056] While setting the spiral guide plate 430, the end of the water pump 420 that extends into the intermediate cylinder 400 is adjusted to be close to the side end face of the intermediate cylinder 400 where the water pump 420 is connected, and this end is also close to the bottom end of the intermediate cylinder 400.

[0057] In this embodiment, the spiral guide plate 430 disposed inside the intermediate cylinder 400 is more conducive to the flow of condensate in the intermediate cylinder 400 toward the direction of the suction pipe 420, thereby making the water level at the end of the intermediate cylinder 400 near the suction pipe 420 higher, making it easier for the suction pipe 420 to draw in condensate, and thus reducing the condensate in the intermediate cylinder 400 in a timely manner. This not only helps to maintain the high temperature of the intermediate cylinder 400 and the high temperature of the drying roller 100, which is convenient for drying the coated paper 101, but also quickly reduces the condensate in the intermediate cylinder 400, so that even if the condensate rotates with the intermediate cylinder 400, the impact force of the condensate on the suction pipe 420 will be smaller.

[0058] Moreover, the spiral guide plate 430 can keep the intermediate cylinder 400 at a high temperature for a long time, which can reduce the amount of condensate generated in the intermediate cylinder 400 and further reduce the impact of condensate on the pumping pipe 420.

[0059] Furthermore, such as Figures 3 to 7 As shown, there is a gap between the outer wall of the intermediate cylinder 400 and the inner wall of the drying roller 100, and the gap between the intermediate cylinder 400 and the drying roller 100 forms a water film cavity 500. Air guide holes 401 and flow guide holes 402 are respectively opened at both ends of the intermediate cylinder 400, and the water film cavity 500 is connected to the air guide holes 401 and flow guide holes 402.

[0060] Specifically, the air guide hole 401 is opened on one end face of the intermediate cylinder 400 connected to the steam pipe 410, and the flow guide hole 402 is opened on one end face of the intermediate cylinder 400 connected to the water pumping pipe 420.

[0061] The water film layer is mainly composed of condensate. This condensate includes water condensed from the steam entering the drying roller 100 through the guide holes 402 and the air guide holes 401, as well as condensate that may flow out from the guide holes 402 and the air guide holes 401 when the intermediate cylinder 400 rotates. The steam flowing to the drying roller 100 can heat the condensate inside the drying roller 100 into high-temperature condensate. The high-temperature condensate enters the gap between the drying roller 100 and the intermediate cylinder 400, forming a water film layer in the gap. Since the specific heat capacity of water is much larger than that of metal, the temperature of the water film layer will not change much when steam is continuously introduced. Moreover, when the drying roller 100 rotates, it can drive the high-temperature condensate to rotate as well, thereby achieving full coverage of the inner roller surface of the drying roller 100 by the high-temperature condensate, making the inner roller surface of the drying roller 100 more evenly heated. When the drying roller 100 is drying the coated paper 101, the large temperature difference between different areas of the drying roller 100 makes it difficult to dry the coated paper 101 more evenly, thus resulting in better quality coated paper 101 produced.

[0062] In addition, since the condensate level is higher on the side near the water pipe 420, more condensate flows out from the guide hole 402 than from the air guide hole 401. This results in a higher condensate level on the side of the drying roller 100 near the guide hole 402. The condensate with a higher level can flow through the water film cavity 500 to the side with a lower level, which allows the condensate between the drying roller 100 and the intermediate cylinder 400 to be constantly replaced. This prevents the condensate from being in the water film cavity 500 for a long time, which would cause the condensate near the steam to have a high temperature and the condensate far away from the steam to have a low temperature. This is beneficial for the uniform distribution of heat in the water film cavity 500.

[0063] Meanwhile, in this embodiment, the steam is first introduced into the intermediate cylinder 400. As the steam enters the drying roller 100 through the guide hole 402 and the air guide hole 401, the impact of the steam gradually decreases. Compared with the prior art, which directly introduces steam into the drying roller 100, the steam in this invention can cause less impact on the drying roller 100, which helps the drying roller 100 to rotate stably. Furthermore, the water film layer formed in the gap between the drying roller 100 and the intermediate cylinder 400 can also re-enter the intermediate cylinder 400 through the guide hole 402 and the air guide hole 401, which can keep the condensate in the drying roller 100 within a relatively stable range. The stability of the condensate in the drying roller 100 also helps the drying roller 100 to rotate stably.

[0064] In some embodiments, such as Figures 3 to 5 , Figures 8 to 10 As shown, an installation pipe 440 is fixed to the end of the intermediate cylinder 400 away from the steam pipe 410, and a water suction pipe 420 is inserted into the installation pipe 440. In this embodiment, the installation pipe 440 is coaxially arranged with the intermediate cylinder 400, and the installation pipe 440 is equivalent to the rotating shaft of the intermediate cylinder 400. The installation pipe 440 is inserted into the end roller shaft of the drying roller 100 and is rotatably connected to the end roller shaft of the drying roller 100. The water suction pipe 420 is inserted into the installation pipe 440 and is rotatably connected to the installation pipe 440.

[0065] A stabilizing mechanism 600 is provided between the mounting pipe 440 and the water pumping pipe 420 to stabilize the rotation speed of the drying roller 100. The stabilizing mechanism 600 includes a conical cylinder 610, a fixed pipe 630, and a friction block 640. The conical cylinder 610 is sleeved on the mounting pipe 440, with its small end facing the drying roller 100. The fixed pipe 630 includes a straight pipe 632 and a convex ring 631. The convex ring 631 is sleeved on the straight pipe 632 and integrally formed with it. The straight pipe 632 is sleeved on the portion of the water pumping pipe 420 that extends out of the mounting pipe 440. A limiting plate 650 is provided inside the conical cylinder 610. The friction block 640 is movably disposed in the cavity formed by the limiting plate 650, the fixed pipe 630, and the conical cylinder 610. The friction block 640 is always in contact with the side of the convex ring 631 facing the drying roller 100 by an elastic element.

[0066] Specifically, the stabilizing mechanism 600 is only located at the end of the intermediate cylinder 400 where the water pumping pipe 420 is located. The conical cylinder 610 is a frustoconical cylinder body, and the conical cylinder 610 is sleeved on the outer wall of the mounting pipe 440 at the corresponding end of the drying roller 100. The small end of the conical cylinder 610 is fixed to the mounting pipe 440 by bolts. The straight pipe 632 of the fixing pipe 630 is sleeved on the end of the water pumping pipe 420 that extends out of the corresponding mounting pipe 440, and is fixedly connected to the water pumping pipe 420 by bolts. A cylinder cover 620 is installed at the large end of the conical cylinder 610. The cylinder cover 620 is a circular ring plate, and the cylinder cover 620 is sleeved on the fixing pipe 630 and fixedly connected to the conical cylinder 610 by bolts. One end of the straight pipe 632 of the fixing pipe 630 passes through the inner ring hole of the cylinder cover 620 and extends into the conical cylinder 610. The convex ring 631 of the fixing pipe 630 is located inside the conical cylinder 610.

[0067] Multiple limiting plates 650 are provided on the inner wall of the conical cylinder 610, with each pair of limiting plates 650 corresponding to a friction block 640. The friction block 640 is movably disposed within the cavity formed by the two limiting plates 650, part of the conical cylinder 610, and part of the fixed tube 630 (including a straight tube 632 and a convex ring 631). The two sides of the friction block 640 are in contact with the limiting plates 650 on both sides. The length direction of the limiting plates 650 is parallel to the axial direction of the conical cylinder 610, thereby restricting the movement of the friction block 640 within the cavity in a direction parallel to the axial direction of the conical cylinder 610. An elastic element, which can be a compression spring 633, is provided between the friction block 640 and the end face of the small end of the conical cylinder 610, with both ends of the compression spring 633 abutting against the end face of the friction block 640 and the small end of the conical cylinder 610. Under the action of the compression spring 633, the side of the friction block 640 away from the small end of the conical cylinder 610 always abuts against the side of the convex ring 631 facing the drying roller 100.

[0068] When the conical cylinder 610 rotates with the intermediate cylinder 400, the friction block 640, which is movably disposed inside the conical cylinder 610, will be pressed against the inner wall of the conical cylinder 610 by centrifugal force, and under the action of centrifugal force, it can also move away from the drying roller 100. The faster the intermediate cylinder 400 rotates, the greater the centrifugal force on the friction block 640, and the greater the contact force between the friction block 640 and the convex ring 631 of the fixed tube 630. This reduces the rotational speed of the intermediate cylinder 400, and the reduced rotational speed increases the adhesive force between the intermediate cylinder 400 and the drying roller 100, further reducing the rotational speed of the drying roller 100. Conversely, the slower the intermediate cylinder 400 rotates, the smaller or even nonexistent the centrifugal force on the friction block 640. In this case, the contact force between the friction block 640 and the convex ring 631 remains essentially unchanged, and the influence of the friction block 640 on the intermediate cylinder 400 is relatively small. Since the rotational speed of the intermediate cylinder 400 is already relatively low, the adhesive force between the intermediate cylinder 400 and the drying roller 100 will be larger, and the rotational speed of the drying roller 100 will also decrease. This ensures that regardless of the rotational speed within the intermediate cylinder 400, the rotational speed of the drying roller 100 remains within a suitable range, resulting in relatively stable rotational speed.

[0069] The drying roller 100 with a stable rotation speed is less likely to cause the coated paper 101 to twist or tear during the drying process, which is conducive to producing high-quality coated paper 101.

[0070] In some embodiments, such as Figure 6 and Figure 7 As shown, the transfer roller 300 is a hollow roller, and multiple air holes 310 are opened on the roller surface of the transfer roller 300, which are evenly distributed on the roller surface of the transfer roller 300. A vacuuming device is provided on the support, which is configured to draw a negative pressure into the transfer roller 300 through the air holes 310.

[0071] Specifically, the transfer roller 300 can be mounted on the bracket via a bearing mounting seat. In this embodiment, the transfer roller 300 is located below the drying roller 100. The bracket is equipped with a transfer motor capable of driving the transfer roller 300 to rotate. The transfer motor can be a servo motor. The coated paper 101 extends from the drying roller 100 downwards, around the bottom roller surface of the transfer roller 300, and finally around the cooling roller 200 to reach the subsequent process.

[0072] In this embodiment, the vacuuming device can be a blower, and the exhaust port of the vacuuming device can be an elongated port parallel to the length direction of the transfer roller 300. The vacuuming device is mounted on a bracket, and the exhaust port of the vacuuming device faces the upper roller surface of the transfer roller 300.

[0073] When the transfer motor drives the transfer roller 300 to rotate, the vacuum equipment is activated. When the coated paper 101 passes over the lower roller surface of the transfer roller 300, due to the continuous suction of the vacuum equipment, the transfer roller 300 gradually presents a negative pressure state. When the transfer roller 300 transfers the coated paper 101, the coated paper 101 can stick tightly to the transfer roller 300, which can make the plastic film or composite film coated on the paper adhere more tightly to the paper, making the waterproof performance of the coated paper 101 better and the quality better.

[0074] Furthermore, the cooling roller 200 is a hollow roller, with a cooling pump connected to one end and a cooling tower connected to the other end. The cooling pump is used to deliver a cooling medium into the cooling roller 200. The coated paper 101, which has been transferred by the transfer roller 300, can bypass the cooling roller 200. The cooling medium inside the cooling roller 200 can reduce the temperature of the cooling roller 200, and the cooling roller 200 can reduce the temperature of the coated paper 101, preventing the coated paper 101 from absorbing moisture from the air due to its high temperature, and preventing deformation caused by the coated paper 101 absorbing moisture.

[0075] During the cooling process of the dried coated paper 101, the cooling roller 200 is cooled by a cooling pump that can introduce cooling medium into the cooling roller 200. A water pump is installed at the end of the cooling roller 200 away from the cooling pump. One end of the water pump extends into the cooling roller 200 and can perform suction on the cooling roller 200. The other end of the water pump is connected to a cooling tower. The cooling medium sucked by the water pump can be transported to the cooling tower. After a series of heat exchange operations in the cooling tower, the cooling tower can provide cooling medium to the cooling pump, thereby achieving continuous cooling of the cooling roller 200.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 continuous drying device for producing coated paper, characterized in that, The device includes a support frame on which a drying roller (100), a cooling roller (200), and a transfer roller (300) are rotatably mounted, with the transfer roller (300) located between the drying roller (100) and the cooling roller (200). The drying roller (100) is hollow and has an intermediate cylinder (400) inside. The intermediate cylinder (400) has a steam pipe (410) and a water pumping pipe (420) at both ends. The intermediate cylinder (400) is coaxially rotatably connected to the drying roller (100) through the steam pipe (410) and the water pumping pipe (420). The intermediate cylinder (400) has a spiral guide plate (430) inside. The spiral guide plate (430) is configured to transport the condensate near the steam pipe (410) to the side near the water pumping pipe (420) when the intermediate cylinder (400) rotates with the drying roller (100). An installation pipe (440) is fixed to one end of the intermediate cylinder (400) away from the steam pipe (410). The water suction pipe (420) is inserted into the installation pipe (440). A stabilizing mechanism (600) capable of stabilizing the rotation speed of the drying roller (100) is provided between the installation pipe (440) and the water suction pipe (420). The stabilizing mechanism (600) includes a conical cylinder (610), a fixed pipe (630), and a friction block (640). The conical cylinder (610) is sleeved on the installation pipe (440). The small end of the conical cylinder (610) Facing the drying roller (100), the fixed tube (630) includes a straight tube (632) and a convex ring (631). The convex ring (631) is sleeved on the straight tube (632) and integrally formed with the straight tube (632). The straight tube (632) is sleeved on the water pumping pipe (420). The friction block (640) is movably disposed in the cavity formed by the fixed tube (630) and the conical cylinder (610). The friction block (640) is always in contact with the side of the convex ring (631) facing the drying roller (100) by an elastic element. The steam pipe (410) is used to introduce steam into the intermediate cylinder (400), and the water suction pipe (420) is used to suction the condensate accumulated at the bottom of the intermediate cylinder (400).

2. The continuous drying equipment for coated paper production according to claim 1, characterized in that: The end of the water pump (420) that extends into the intermediate cylinder (400) is near the side end of the intermediate cylinder (400) where the water pump (420) is located.

3. The continuous drying equipment for coated paper production according to claim 1, characterized in that: There is a gap between the outer wall of the intermediate cylinder (400) and the inner wall of the drying roller (100). The gap between the intermediate cylinder (400) and the drying roller (100) forms a water film cavity. Air guide holes (401) and flow guide holes (402) are respectively opened at both ends of the intermediate cylinder (400). The water film cavity communicates with the air guide holes (401) and the flow guide holes (402).

4. The continuous drying equipment for coated paper production according to claim 1, characterized in that: The elastic element is a compression spring (633), which is sleeved on the mounting tube (440) and the straight tube (632). The two ends of the compression spring (633) respectively abut against the end plate on the small end side of the conical cylinder (610) and the friction block (640).

5. The continuous drying equipment for coated paper production according to claim 1, characterized in that: The transfer roller (300) is a hollow roller, and air holes (310) are provided on the roller surface of the transfer roller (300). A vacuum pumping device is provided on the bracket, and the vacuum pumping device is configured to draw negative pressure into the transfer roller (300) through the air holes (310).

6. The continuous drying equipment for coated paper production according to claim 5, characterized in that: The air holes (310) are provided in multiple ways, and the multiple air holes (310) are evenly distributed on the roller surface of the transfer roller (300).

7. The continuous drying equipment for coated paper production according to claim 1, characterized in that: The cooling roller (200) is a hollow roller, and the cooling roller (200) is connected to a cooling pump, which is configured to deliver a cooling medium into the cooling roller (200).

8. The continuous drying equipment for coated paper production according to claim 1, characterized in that: The pumping pipe (420) is a rigid pipe.

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