Paper machine and its vacuum roll

Abstract

This application provides a paper machine and its vacuum roll. The vacuum roll includes a roll core, a roll shell, and a spraying device. Both the roll core and the spraying device are located within the roll shell. The roll core rotates relative to the roll shell. A sealing strip extending axially along the roll core is provided on the roll core. When the roll core and roll shell rotate relative to each other, the sealing strip rubs against the inner wall of the roll shell. The spraying device is positioned corresponding to the friction point between the sealing strip and the inner wall of the roll shell, and is used to spray water to lubricate the friction point. The vacuum roll of the paper machine provided in this application, by designing a spraying device, can achieve lubrication of the sealing strip, solving the problem of abnormal paper breakage caused by vacuum roll wear, while simultaneously extending the service life of the vacuum roll and reducing maintenance costs.

Description

Technical Field

[0001] This application relates to the technical field of papermaking equipment, specifically to a paper machine and its vacuum roll. Background Technology

[0002] In high-speed white cardboard machines, the vacuum zone inside the vacuum roll core of the wire pressing section contacts the outer roll shell via an intermediate graphite sealing strip, ensuring rotation without vacuum leakage. However, due to the high speed of the roll shell and the friction between the sealing strip and the inner wall, during periods of paper breakage or when there is no pulp on the roll surface before restarting, the sealing strip cannot draw water from the pulp to lubricate it, leading to dry friction damage, vacuum failure, and abnormal operation. Furthermore, this rapid wear and tear increases the frequency of equipment maintenance and wastes on spare parts and repair costs. Utility Model Content

[0003] The first aspect of this application provides a vacuum roll for a paper machine. The vacuum roll includes a roll core, a roll shell, and a spraying device. The roll core and the spraying device are both disposed inside the roll shell. The roll core rotates relative to the roll shell. A sealing strip is provided on the roll core and extends along the axial direction of the vacuum roll. When the roll core and the roll shell rotate relative to each other, the sealing strip comes into frictional contact with the inner wall of the roll shell. The spraying device is disposed corresponding to the friction position between the sealing strip and the inner wall of the roll shell and is used to spray water to lubricate the friction position.

[0004] In some optional embodiments, the spraying device includes a spray pipe and a plurality of nozzles arranged at intervals along the length of the spray pipe, the spray pipe extending parallel to the axial direction of the vacuum roller.

[0005] In some alternative embodiments, the spray pipe is fixedly connected to the roller core.

[0006] In some alternative embodiments, the spray device further includes a connecting pipe, one end of which is connected to the spray pipe and the other end of which is connected to an external water supply device, and a pressure gauge is provided on the connecting pipe.

[0007] In some alternative embodiments, the connecting pipe is connected to the middle of the spray pipe; the connecting pipe is provided with a control valve.

[0008] In some alternative embodiments, the nozzle is a full-width fan-shaped spray nozzle.

[0009] In some alternative embodiments, the nozzle orifice diameter of the spray head is 1.0 mm to 1.4 mm, and the spray width is 300 mm to 350 mm.

[0010] In some optional embodiments, the spray point of the nozzle is 20-40 cm in front of the sealing strip, for pre-wetting the inner wall of the roller shell that comes into contact with the sealing strip.

[0011] In some alternative embodiments, the spray pipe is a DN25 stainless steel round pipe.

[0012] Secondly, embodiments of this application provide a paper machine, which includes the vacuum roll described in the above embodiments.

[0013] The vacuum roller of the paper machine provided in this application embodiment can achieve lubrication of the sealing strip by designing a spray device, which can solve the problem of abnormal paper breakage caused by vacuum roller wear, while extending the service life of the vacuum roller and reducing maintenance costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the vacuum roller of the paper machine of this application;

[0016] Figure 2 yes Figure 1 A schematic cross-sectional view of the vacuum roller along line AA in the embodiment;

[0017] Figure 3 This is a schematic diagram of the structure of an embodiment of the spraying device of this application;

[0018] Figure 4 yes Figure 3 Enlarged schematic diagram of the local structure at point B;

[0019] Figure 5 yes Figure 3 A magnified schematic diagram of the local structure at point C. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0021] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of an embodiment of the vacuum roller of the paper machine of this application. Figure 2 yes Figure 1 A cross-sectional view of the vacuum roller along line AA in this embodiment; the vacuum roller in this embodiment includes a roller core 100, a roller shell 200, and a spraying device 300.

[0024] Specifically, the roller core 100 and the spraying device 300 are both located inside the roller shell 200. The roller core 100 and the roller shell 200 rotate relative to each other. The roller core 100 is provided with a sealing strip 400 extending along the axial direction of the vacuum roller. When the roller core 100 and the roller shell 200 rotate relative to each other, the sealing strip 400 comes into frictional contact with the inner wall 201 of the roller shell 200. The spraying device 300 is set at the friction position between the sealing strip 400 and the inner wall 201 of the roller shell, and is used to spray water to lubricate the friction position.

[0025] Optionally, please refer to the following as well. Figure 3 and Figure 4 , Figure 3This is a schematic diagram of the structure of an embodiment of the spraying device of this application. Figure 4 yes Figure 3 The enlarged schematic diagram of a partial structure at point B shows that the spraying device 300 in this embodiment includes a spray pipe 310 and a plurality of nozzles 320 arranged at intervals along the length of the spray pipe 310. The spray pipe 310 extends parallel to the axial direction of the vacuum roller. The spray pipe 310 can be a DN25 stainless steel round pipe.

[0026] Optionally, the nozzle 320 in this embodiment is a full-width fan-shaped spray nozzle, meaning the sprayed water is in a fan shape, increasing the spray area. The nozzle orifice diameter of the nozzle 320 is 1.0mm to 1.4mm, and the spray width (the contact width between the water mist fan shape and the inner wall 201 of the roller shell or the sealing strip 400) is 300mm to 350mm.

[0027] Please continue reading. Figure 2 , Figure 2 The arrow on the middle roller shell 200 indicates the rolling direction. In this embodiment, the spray point of the nozzle 320 is 20-40cm in front of the sealing strip 400, which is used to pre-wet the inner wall 201 of the roller shell 200 that is in contact with the sealing strip 400.

[0028] In a specific embodiment, the fan-shaped nozzle is a device for accurately spraying water onto the sealing strip in a precise and targeted manner. The nozzle orifice diameter is 1.2mm, the spray width is 320mm, and the spray point is 32mm in front of the sealing strip (too far in front will cause the water to scatter and have no effect, too close will lack impact and will not be able to effectively penetrate the gap between the sealing strip and the roller shell). The flow rate is about 20L / min (too much water will easily accumulate at the sealing strip position, flow into the vacuum holes on the roller shell surface, and cause water splashing, resulting in slurry bubbles and slurry splashing problems. Too little water will not form the conditions for water film formation). The water pressure is controlled at about 3.0 bar to ensure that the sealing strip is always effectively lubricated by lubricating water, while also ensuring that the lubricating water does not drip excessively, causing abnormal moisture on the paper surface. The inner wall of the roller shell is pre-wetted, and the water at the wet position has a certain initial kinetic energy driven by the roller shell. When it comes into contact with the sealing strip, it rushes towards the gap between the sealing strip and the roller shell, forming a water film. This isolates the sealing strip from direct contact and friction between the sealing strip and the inner wall of the roller shell, achieving the purpose of water film lubrication and reducing wear on the graphite sealing strip.

[0029] The spray pipe 310 is fixedly connected to the roller core 100. Optionally, the spray device 300 also includes a connecting pipe 330, one end of which is connected to the spray pipe 310, specifically to the middle of the spray pipe 310, and the other end of which is connected to an external water supply device (not shown in the figure). The external water supply device may include a water tank and a water pump, etc.

[0030] Please refer to the following: Figure 3 and Figure 5 , Figure 5 yes Figure 3 The enlarged schematic diagram of the partial structure at point C shows that the connecting pipe 330 is equipped with a pressure gauge 340 and a control valve 350. The pressure gauge 340 is used to detect the water pressure in the connecting pipe 330 (the water pressure is controlled at about 3.0 bar), and the control valve 350 can be a manual valve.

[0031] The vacuum roller of the paper machine provided in this application embodiment can achieve lubrication of the sealing strip by designing a spray device, which can solve the problem of abnormal paper breakage caused by vacuum roller wear, while extending the service life of the vacuum roller and reducing maintenance costs.

[0032] In addition, this application embodiment also provides a paper machine, which includes the vacuum roller described in the above embodiments. Of course, the paper machine may also include other structures, which will not be described in detail here within the understanding of those skilled in the art.

[0033] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A vacuum roll of a paper machine, characterized in that The vacuum roller includes a roller core, a roller shell, and a spraying device. The roller core and the spraying device are both located inside the roller shell. The roller core rotates relative to the roller shell. The roller core is provided with a sealing strip extending along the axial direction of the vacuum roller. When the roller core and the roller shell rotate relative to each other, the sealing strip comes into frictional contact with the inner wall of the roller shell. The spraying device is provided at the friction position between the sealing strip and the inner wall of the roller shell and is used to spray water to lubricate the friction position.

2. The vacuum roll according to claim 1, characterized in that The spraying device includes a spray pipe and a plurality of nozzles arranged at intervals along the length of the spray pipe, wherein the spray pipe extends parallel to the axial direction of the vacuum roller.

3. The vacuum roll according to claim 2, characterized in that The spray pipe is fixedly connected to the roller core.

4. The vacuum roll of claim 2, wherein, The spraying device also includes a connecting pipe, one end of which is connected to the spraying pipe and the other end is connected to an external water supply device. A pressure gauge is installed on the connecting pipe.

5. The vacuum roll according to claim 4, characterized in that The connecting pipe is connected to the middle of the spray pipe; a control valve is provided on the connecting pipe.

6. The vacuum roller according to claim 2, characterized in that, The nozzle is a full-width fan-shaped spray nozzle.

7. The vacuum roller according to claim 6, characterized in that, The nozzle orifice diameter of the spray head is 1.0 mm to 1.4 mm, and the spray width is 300 mm to 350 mm.

8. The vacuum roller according to claim 7, characterized in that, The nozzle's spray point is 20-40cm in front of the sealing strip, used to pre-wet the inner wall of the roller shell that comes into contact with the sealing strip.

9. The vacuum roller according to claim 2, characterized in that, The spray pipe is a DN25 stainless steel round pipe.

10. A paper machine, characterized in that, The paper machine includes the vacuum roll as described in any one of claims 1-9.

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