Operational assembly for a drying section of a fibrous web machine and its sealing profile

Abstract

The invention relates to a sealing profile (12) of a runnability assembly (10), which sealing profile comprises a sealing part (22) and a locking part (24), wherein the locking part (24) comprises a flange (26), a locking shoulder (28) connected to the flange (26), and a positioning arm (30) connected to the locking shoulder (28). The locking shoulder (28) extends in the width direction of the sealing profile (12) only for 5-20 %, preferably for 10-15 % of the length of the locking part (24) in order to reduce the load of the sealing profile (12); and the thickness of the sealing part (22) is thinner than the flange (26) in the perpendicular direction with respect to the longitudinal direction and the width direction of the sealing profile (12). The invention also relates to a runnability assembly (10) for a drying part of a fiber web machine.

Description

Technical Field

[0001] This invention relates to a sealing profile for a running component, the sealing profile being adapted to be fastened to a sealing bracket associated with the running component; the sealing bracket includes a locking recess with a continuous shape lock in the fiber web width direction of the sealing bracket; the locking recess includes a locking lip for locking the sealing profile and a positioning groove for positioning the sealing profile; the sealing profile includes a sealing portion for sealing the running component and a locking portion for fastening the sealing profile to the locking recess associated with the sealing bracket of the running component; wherein the locking portion is a continuation of the sealing portion and is adapted to be mounted in the locking recess of the sealing bracket, wherein the locking portion includes:

[0002] -Flange, used to support the sealing profile between the locking lips of the sealing bracket;

[0003] - A locking shoulder, fastened to the flange, so that the sealing profile is shaped and locked in the locking recess along the width direction of the sealing profile; the locking shoulder is thicker than the flange; and

[0004] - A positioning arm, connected to a locking shoulder, is used to position the sealing profile in a positioning slot within the operational component.

[0005] The present invention also relates to an operational component for the drying section of a fiber web machine.

[0006] According to the invention, the sealing profile and the operating component are designed to generate negative pressure on the fabric / web in the drying section of the fiber web machine to hold the fiber web on the opposing surfaces of the fabric. The sealing profile, preferably made of a material softer than the web, seals the movable web relative to the operating component so that the seal does not abrade the web. Therefore, the sealing profile must be replaced periodically to ensure the proper functioning of the operating component. Background Technology

[0007] Publication DE102015207284A1, known from the prior art, describes a sealing profile for an operational component adapted to be fastened to a sealing bracket adapted along the width direction of a fiber webening machine, in a locking groove of the sealing bracket. The sealing profile includes a sealing portion retained outside the sealing bracket and a subsequent locking portion extending therefrom, adapted along the width direction of the fiber webening machine in a locking recess of the sealing bracket. The amount of material used for this sealing profile is a significant factor in terms of manufacturing cost. In publication DE102015207284A1, the shape of the sealing profile is not optimized in terms of material cost. Furthermore, manufacturing the sealing profile typically requires material processing, which is an additional work stage and can result in material surplus. Summary of the Invention

[0008] The object of this invention is to provide a sealing profile for a running component and a running component, wherein the sealing profile is a prior art sealing profile and is more advantageous in manufacturing than the running profile. A further object of this invention is to find a material from which the sealing profile can be made without material excess during processing.

[0009] The invention is characterized in that, in order to reduce the load on the sealing profile, the locking shoulder of the sealing profile extends only 5-20%, preferably 10-15%, of the length of the locking portion in the width direction of the sealing profile, and the thickness of the sealing portion in the direction perpendicular to both the longitudinal and width directions is thinner than the thickness of the flange. Therefore, the amount of material required to manufacture the sealing profile can be reduced by more than 30% by weight, advantageously even by 50% by weight, which significantly saves costs. Surprisingly, it has also been found that a thinner sealing portion also results in greater pressure loss, thus producing a better seal against the mesh.

[0010] A further feature of this invention is the use of polyetheretherketone (PEEK) to manufacture the sealing profile, which is directly injected into the mold of the sealing profile. Therefore, there is no material surplus during the manufacture of the sealing profile, and no processing stage that would increase costs is required, or at least the costs of material surplus and processing stages are significantly lower than those of prior art solutions. Furthermore, PEEK has the advantage of being an environmentally friendly, food-grade material. Attached Figure Description

[0011] The invention will now be described in more detail with reference to the accompanying drawings, but the invention is not limited to the applications described below, wherein:

[0012] Figure 1 The schematic diagram shows the operating components, their sealing profiles, and the drying cylinder along the width-density direction of the fiber web machine.

[0013] Figure 2 A side view shows the operational component and its sealing profile according to the invention.

[0014] Figure 3 The sealing profile, imaged separately using axonometric projection, is shown separately.

[0015] Figure 4 The cross-section of the sealing profile is shown, cut along the width direction of the sealing profile. Detailed Implementation

[0016] like Figure 1 As shown, the operational assembly 10 according to the invention is arranged on the drying cylinder 40, whereby the operational assembly 10 uses negative pressure to hold the fiber web 46 on the web 44 at the point where the fiber web 46 detaches from the surface of the drying roller 40, and the fiber web continues to travel toward the drying cylinder 42 supported by the movable web 44. The operational assembly may include one or more sealing points 43, at which pressure regions relative to the drying cylinder 40 are defined by means of sealing profiles 12 or by means of the operational assembly 10 and the web 44.

[0017] Figure 2 A cross-section of a traverse assembly 10 for a related component according to the invention is shown. According to the prior art, to seal a pressure region, the traverse assembly 10 includes a sealing bracket 14 fastened to a housing 11 of the traverse assembly. Various sealing profiles 12 according to the invention are fastened to locking recesses 16 formed on the sealing bracket 14. Each locking recess 16 includes a locking lip 18 defining a gap in the locking recess 16 that opens from the traverse assembly 10 in the width direction through which the sealing profile 12 extends. Furthermore, in the locking recess 16, a positioning groove 20 is formed at the rear portion to position the sealing profile 12 correctly on the sealing bracket 14. The structure of the sealing bracket 14 can be similar to structures known in the prior art.

[0018] Reference Figure 3 and Figure 4 According to the prior art, the sealing profile 12 includes a main component of a sealing portion 22 and a fastening locking portion 24 extending from the sealing portion, the locking portion 24 according to... Figure 2 It is adapted to the locking recess 16 of the sealing bracket 14 along the longitudinal direction of the sealing bracket 14. The sealing part 22 remains outside the locking recess 16, and as Figure 1The sealing component 10 is shown relative to the mesh 44. More precisely, the tip 38 of the seal is arranged very close to or in temporary contact with the mesh 44. The mesh is advantageously made of a material harder than the sealing profile, so that possible contact will not damage the mesh, but rather only the sealing profile in contact will be worn. The mesh can be made, for example, of polyphenylene sulfide (PPS) or a suitable material.

[0019] according to Figure 4 The locking portion 24 of the sealing profile 12 includes a flange 26, which is based on Figure 2 It is a portion between the sealing profile 12 and the locking lips 18 of the sealing bracket 14, and its thickness substantially corresponds to the latch formed between the locking lips 18. Therefore, the sealing profile 12 will be supported by the locking lip 18.

[0020] like Figure 4 As shown, when the tip 38 of the sealing portion 22 is further away from the flange 26 in the locking portion 24, a locking shoulder 28 is fastened on the flange 26, which protrudes from the flange 26 in the vertical direction with respect to the width and longitudinal direction of the sealing profile 12. In other words, the sealing profile 12 is thicker at the height of the locking shoulder 28 than at the flange 26 of the locking portion 24. Preferably, the thickness of the sealing profile 12 at the height of the locking shoulder 28 is twice that of the flange 26. The function of the locking shoulder 28 is to prevent the sealing profile 12 from moving towards the mesh from the locking recess 16 of the sealing bracket 14 in the width direction of the sealing profile 12.

[0021] like Figure 4 As shown, when the locking shoulder 28 is further away from the tip 38 of the sealing portion 22 in the locking portion 24, a positioning arm 30 is securely fastened to the locking shoulder. This positioning arm is advantageously a continuation of the flange 26 corresponding to the flange 26 in terms of thickness. The purpose of the positioning arm 30 is to support the sealing profile 12 on the positioning groove 20 of the locking recess 16, as... Figure 2 As shown, this is to prevent the sealing profile 12 from rotating around the support point formed between the locking lip 18 and the flange 26.

[0022] The sealing portion 22 includes two opposing surfaces 31: a locking shoulder surface 34 and a corresponding surface 36. The locking shoulder surface 34 is located on one side of the locking shoulder 28 of the sealing profile 12, while the corresponding surface 36 is located on the opposite sealing portion 22. Preferably, the locking shoulder 28 is formed only on one side of the sealing profile 12. Accordingly, the amount of material required to manufacture the sealing profile 12 can be reduced without compromising the sealing performance of the sealing profile. This also makes it easier to wind the sealing profile onto rollers for transport. Alternatively, the locking shoulder can also be formed on both sides, but this would increase material consumption if the height of the locking shoulder relative to the flange 26 is not reduced.

[0023] Furthermore, the locking shoulder 28 extends only 5-20%, preferably 10-15%, of the width of the locking portion 24 along the width direction of the sealing profile 12, to save material. This significantly reduces material consumption without compromising the sealing performance of the sealing profile. On the other hand, the short locking shoulder also reduces material usage at the locking portion of the sealing profile, allowing for greater flexibility in the length of the sealing profile along the width direction of the fiber web machine. Therefore, for example, sealing profiles 4-10m long can be transported and stored in rolls with relatively small diameters, and can even include 50m lengths cut to appropriate lengths.

[0024] Regarding this invention, aside from the short locking shoulder, it is important that the thickness of the sealing portion 22 is thinner than that of the flange 26 of the locking portion. This achieves significant material savings and better sealing performance. Preferably, the sealing portion is thinner than the flange along its entire length; however, alternatively, the thickness of the sealing portion can be increased up to 10% of the width of the sealing portion 22 at the end adjacent to the flange. The thickness of the sealing portion can be 35-65% of the flange thickness, preferably 45-55%.

[0025] Preferably, the thickness of the seal is uniform over at least 90% of the seal portion to achieve sufficient material savings. Preferably, the stop surface 36 is continuous over the entire width of the seal portion, wherein an angle is formed between the seal portion 22 and the flange 26, wherein the flange 26 is thicker than the seal portion 22. The length of the region where the thickness of the seal portion increases toward the flange, or the so-called variation zone, can be 0-20 mm, preferably 1-5 mm.

[0026] The sealing profile is installed onto the sealing bracket by inserting the sealing profile from the end of the sealing bracket into the locking recess of the sealing bracket along the longitudinal or width direction of the fiber web machine. During the pushing process, the long sealing profile forms a large friction surface relative to the sealing bracket, making it difficult for the seal to enter. In the sealing profile 12 according to the invention, as... Figure 4 As shown, all the corners 32 formed on the sealing profile 12 are rounded, which greatly reduces the contact area between the sealing profile and the sealing bracket. Furthermore, rounded corners are less prone to breakage compared to acute corners. The rounding radius of the corners used can vary between 0.2 and 5.0 mm, preferably between 0.2 and 2.0 mm. Preferably, the head of the positioning arm 30 is also rounded, for example, with a radius that is 50% of the thickness of the positioning arm.

[0027] Traditionally, Teflon (PFTE) has been used to manufacture sealing profiles due to its excellent sliding properties. However, Teflon is also known to be environmentally harmful, and the formation of sealing profiles requires processing, resulting in hazardous waste. According to the present invention, polyetheretherketone (PEEK) or polyetherketone (PEKK) is used as a substitute for Teflon as the raw material for sealing profiles. Both materials are more wear-resistant than Teflon, are bio-based raw materials with high melting points and good sliding properties, and can advantageously allow the sealing profiles to be directly formed into their final shape via nozzle injection molding. This eliminates or at least significantly reduces the need for processing sealing profiles, accelerating and facilitating their production and reducing material loss. Unlike the materials found through testing, many plastics and composites cannot be used as materials for sealing profiles due to their resistance, heat resistance, sliding properties, or price.

[0028] Polyetheretherketone (PEEK) is preferably used as the material for sealing profiles, as its performance is superior to that of PEKK in continuous nozzle injection molding. Furthermore, it has been found that the sliding properties of PEEK are improved at higher temperatures because it is inherently a self-lubricating material.

[0029] The advantage of these materials is that they can be welded together, allowing components of different lengths to be connected into a sealed profile as long as the entire operational component, and further reducing material loss.

[0030] Compared to traditional materials, using PEEK as the sealing profile allows the seal to achieve a thickness thinner than the flange, because the sealing profile made of polyetheretherketone is also very firmly compressed.

[0031] By combining a thin sealing section, a short locking shoulder along the width of the sealing profile, a sealing section thinner than the flange, rounded corners, and a sealing profile injection molded from polyetheretherketone (PEEK), a durable and environmentally friendly sealing profile has been achieved, which can also be used in food-grade fiber webs. Furthermore, due to the lower material requirements, the sealing profile can be manufactured at a low cost, and its ease of installation is due to the choice of materials.

[0032] although Figure 2 The sealing profile 12 is always configured such that the locking shoulder 28 is positioned above in the operating position. However, it is conceivable that at least one sealing profile enters the sealing bracket with the locking shoulder facing downwards at its head, where the distance between the sealing profiles changes for the sealing portion. Therefore, the sealing performance of the operational components can be improved.

[0033] The width of the sealing profile can be 25-50 mm, preferably 30-40 mm, and the length is 95-100% of the width of the fiber webping machine. The thickness of the flange of the sealing profile is 1.5-3.0 mm, preferably 1.8-2.2 mm; the thickness of the locking shoulder is 3-6 mm, preferably 3.5-4.5 mm; and the thickness of the positioning arm preferably corresponds to the thickness of the sealing part. The thickness of the sealing part 22 can be 0.8-1.5 mm, preferably 0.9-1.1 mm. The width of the sealing part can be 15-30 mm, preferably 20-25 mm; the width of the flange is 3-6 mm, preferably 3.5-4.5 mm; the width of the locking shoulder is 1.5-4 mm, preferably 2.0-2.5 mm; and the width of the positioning arm is 6-12 mm, preferably 8-10 mm.

Claims

1. A sealing profile (12) for a running component (10), said sealing profile (12) being adapted to be fastened to a sealing bracket (14) associated with said running component (10); said sealing bracket (14) including a locking recess (16) of continuous shape locking in the fiber web width direction of said sealing bracket (14); said locking recess including a locking lip (18) for locking said sealing profile (12) and a positioning groove for positioning said sealing profile (12). 20); the sealing profile (12) includes a sealing portion (22) for sealing the operational component (10) and a locking portion (24) for fastening the sealing profile (12) to a locking recess (16) of a sealing bracket (14) belonging to the operational component (10); wherein the locking portion (24) is a continuation of the sealing portion (22) and is adapted to be mounted in the locking recess (16) of the sealing bracket (14), wherein the locking portion (24) includes: - Flange (26) for supporting the sealing profile (12) between the locking lips (18) of the sealing bracket (14); - A locking shoulder (28) is fastened to the flange (26) so as to lock the sealing profile (12) in the locking recess (16) in a shape-locking manner along the width direction of the sealing profile (12), the locking shoulder (26) being thicker than the flange (26); as well as - A positioning arm (30), connected to the locking shoulder (28), is used to position the sealing profile (12) on the operating assembly (10) in the positioning groove (20). Its features are, The locking shoulder (28) extends in the width direction of the sealing profile (12) for only 5-20% of the length of the locking part (24) to reduce the load on the sealing profile (12), and the thickness of the sealing part (22) in the longitudinal direction and the vertical direction relative to the width direction of the sealing profile (12) is thinner than the flange (26) of the locking part (24).

2. The sealing profile according to claim 1, characterized in that, The thickness of the sealing part (22) is 35-65% of the thickness of the flange (26).

3. The sealing profile according to claim 1, characterized in that, The thickness of the sealing part (22) is thinner than the flange (26) of the locking part (24) for at least 80% of the width of the sealing part (22).

4. The sealing profile according to claim 1, characterized in that, The thickness of the sealing part (22) is 0.8-1.5 mm.

5. The sealing profile according to any one of claims 1 to 4, wherein, The sealing portion (22) includes two opposing surfaces (31), characterized in that the locking shoulder (28) is formed only on one side of one surface (31) of the sealing profile (12).

6. The sealing profile according to any one of claims 1 to 4, characterized in that, The contact area between the sealing profile (12) for the locking part (24) and the sealing bracket (14) is 1-10% of the total area of ​​the locking part (24) to simplify the installation of the sealing profile (12).

7. The sealing profile according to any one of claims 1 to 4, wherein, The sealing part (22) includes two opposing surfaces (31), characterized in that the locking part (24) includes a locking shoulder surface (34) and a corresponding surface (36), wherein the corresponding surface (36) is continuously located on the same plane as the surface (31) of the sealing part (22) over the entire width of the locking part (24).

8. The sealing profile according to any one of claims 1 to 4, characterized in that, The corner (32) of the locking part (24) is rounded to reduce the contact area between the sealing profile (12) and the sealing bracket (14).

9. The sealing profile according to claim 8, characterized in that, The rounding radius (R) of the corner (32) is 0.2-5.0 mm.

10. The sealing profile according to any one of claims 1 to 4, characterized in that, The sealing profile (12) is made of injection-molded polyetherketone (PEKK).

11. The sealing profile according to any one of claims 1 to 4, characterized in that, The sealing profile (12) is made of injection-molded polyetheretherketone (PEEK).

12. The sealing profile according to any one of claims 1 to 4, characterized in that, The positioning arm (30) is straight and directly connected to the locking shoulder (28).

13. The sealing profile according to claim 1, characterized in that, The locking shoulder (28) extends in the width direction of the sealing profile (12) for a length that is only 10-15% of the length of the locking part (24).

14. The sealing profile according to claim 2, characterized in that, The thickness of the sealing part (22) is 45-55% of the thickness of the flange (26).

15. The sealing profile according to claim 3, characterized in that, The thickness of the sealing part (22) is thinner than the flange (26) of the locking part (24) for at least 90% of the width of the sealing part (22).

16. The sealing profile according to claim 4, characterized in that, The thickness of the sealing part (22) is 0.9-1.1 mm.

17. The sealing profile according to claim 6, characterized in that, The contact area between the sealing profile (12) for the locking part (24) and the sealing bracket (14) is 2-7% of the total area of ​​the locking part (24) to simplify the installation of the sealing profile (12).

18. The sealing profile according to claim 9, characterized in that, The rounding radius (R) of the corner (32) is 0.2-2.0 mm.

19. An operational component (10) for the drying section of a fiber web machine, comprising: - Sealing profile (12) for sealing the operational component (10); - A sealing bracket (14) for supporting the sealing profile (12), the sealing profile being adapted to be fastened to the sealing bracket (14) associated with the operational component (10). Its features are, The sealing profile (12) is the sealing profile (12) according to any one of claims 1-18.

20. The operational component (10) according to claim 19, characterized in that, The operational component (10) includes a plurality of sealing profiles (12), wherein at least a portion of the sealing profiles are adapted to the sealing bracket (14) such that the direction of the locking shoulder (28) of the sequentially arranged sealing profiles (12) is changed by 180° to improve sealing performance.

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