Belt and roller set for rewinding machine

Abstract

A belt and roller set for a rewinding machine, the belt (230) comprising a main body layer (233) and a coating (234) covering the main body layer (233), the coating comprising an inner side coating (2341) and an outer side coating (2342), the inner side coating (2341) comprising at least two guide ribs (231) extending in the longitudinal direction of the belt (230). The roller set for the rewinding machine comprises a first roller (210) and a second roller (220), the first roller (210) and the second roller (220) are used for supporting a belt (230) for the rewinding machine, the first roller (210) is provided with a first groove (211) used for receiving a guide rib (231) of the belt (230), the second roller (220) is provided with a second groove (221) used for receiving the guide rib (231) of the belt (230), the first groove (211) is wider than the second groove (221), and the first groove (211) and the second groove (221) are communicated with each other. The first groove (211) is also wider than a guide rib (231) of the belt (230).

Description

Technical Field

[0001] The present disclosure relates to the technical field of parts for fiber web machines, and in particular to a belt of a rewinder for a fiber web machine and a roller group matched with the belt. Background Art

[0002] The width of the rewinder belt bed is relatively large, and multiple belts are usually arranged in parallel. Figure 1 As shown, the rewinding machine 100 includes a roller group consisting of a first roller 110 and a second roller 120 and a plurality of belts 130 arranged on the circumference of the first roller 110 and the second roller 120 and supported by them.

[0003] On the one hand, due to the high speed of the belt bed, it is easy for the existing multiple belts to be laterally misaligned during operation, resulting in belt marks. Figure 2-Figure 3 As shown, in order to maintain the belt position in the transverse direction, it is known to arrange the belt and roller group in the following manner: the belt 130 is provided with a guide rib 131 on the inner surface along the longitudinal direction, and the first roller 110 and the second roller 120 are provided with a first groove 111 and a second groove 121 corresponding to the guide rib 131. The width W1 of a single existing belt 130 is 150mm-300mm, and the thickness T1 is 5mm-9mm. A guide rib 131 is provided on the inner side of the single belt 130, and the width W11 of the guide rib 131 is 30-50mm, and the height H1 is 5-10mm. Figure 3 As shown, the first roller 110 and the second roller 120 of the existing roller group are respectively provided with a first groove 111 and a second groove 121, the width of the first groove 111 and the second groove 121 are the same and aligned with each other, the width of the first groove 111, the second groove 121 and the guide rib 131 are also the same, and after the belt 130 is installed on the roller group, the guide rib 131 on the inner side of each belt 130 is inserted into the first groove 111 and the second groove 121.

[0004] However, the above solution has the following technical problems. Since the belt is in continuous contact and friction with the roller grooves (the first groove and the second groove) during use, especially when there is a problem with the roller alignment (for example, the first roller and the second roller are not completely aligned), some edges of the guide ribs are continuously worn and unevenly stressed, resulting in severe wear of the guide ribs on the belt, which in turn affects the service life of the belt. Due to the above problems, the inventors found that the service life of the rewinder belt of the prior art using this structure is only 3-6 months.

[0005] On the other hand, in connection with the processing of the fiber web on the fiber web machine, the first roller 110 and the second roller 120 may have position or shape errors, such as uneven shapes of the rollers or deformation of the rollers due to continuous force. Figure 3As shown, even if this shape error is very small, as the speed of the rewinding machine 100 increases, it has been observed that due to the shape error of the roller, a lateral force 140 is generated on the belt portion in contact with the roller, which lateral force 140 also forces the belt 130 to move in the lateral direction, such as Figure 3 The guide ribs 131 of the belt 130 are shown with twisted running paths 132. This not only leads to the aforementioned problem of guide rib wear, but also leads to premature and excessive wear of the surface of the belt 130 in contact with the fiber web, and in the worst case, wear and affect the fiber web on the belt 130. On the other hand, it leads to grooves or folds between the multiple belts arranged in parallel in the rewinding machine, which in turn causes the fiber web on the belt to produce belt groove marks and thus lead to waste rolls. Utility Model Content

[0006] According to one aspect of the utility model, compared with the prior art, the outer shape of the belt for the rewinder is improved to improve the distribution of stress on the belt, thereby increasing the service life of the belt.

[0007] According to another aspect of the utility model, compared with the prior art, the internal structural strength of the belt for the rewinder is improved to increase the service life.

[0008] According to another aspect of the utility model, compared with the prior art, the shape of the roller set of the rewinding machine is improved to improve the distribution of stress on the belt supported by the roller set, thereby increasing the service life of the belt.

[0009] The utility model provides a belt for a rewinder, wherein the belt comprises a main body layer and a coating covering the main body layer, the coating comprises an inner coating and an outer coating, and the inner coating comprises at least two guide ribs extending along the longitudinal direction of the belt.

[0010] Preferably, the height of the guide rib is 0.5 mm to 5 mm, and the width of the guide rib adjacent to the inner side surface of the belt is 0.5 mm to 7 mm.

[0011] Preferably, the width of the bottom of the groove formed between the two guide ribs is 5 mm-20 mm.

[0012] Preferably, the covering layer includes an inner covering layer and an outer covering layer, the inner covering layer includes the guide rib, and the inner covering layer and the outer covering layer are made of the same or different materials.

[0013] Preferably, the connection between the bottom of the groove and the side wall of the guide rib is a chamfered transition and / or the connection between the two side walls of the guide rib and the top wall forms two sides of the top of the guide rib with a chamfered transition.

[0014] Preferably, an outer surface of the belt is provided with exhaust grooves.

[0015] Preferably, an angle between a virtual extension line of the side wall of the guide rib and a plane where the base layer of the belt excluding the guide rib is located is 75°-130°.

[0016] Preferably, the cross section of the guide rib is wedge-shaped or trapezoidal.

[0017] Preferably, the thickness of the base layer is 3 mm-30 mm.

[0018] Preferably, the coating layer is polyurethane, the main body layer is fabric, and the polyurethane is melted and filled into the fabric from the inner and outer sides of the belt.

[0019] The utility model proposes a roller group for a rewinding machine, which includes a first roller and a second roller for supporting a belt for the rewinding machine, the first roller is provided with a first groove for receiving a guide rib of the belt, the second roller is provided with a second groove for receiving the guide rib of the belt, the first groove is wider than the second groove, and the first groove is also wider than the guide rib of the belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure shows a working schematic diagram of a belt and roller group for a rewinder in a fiber web machine in the prior art.

[0021] Figure 2 A cross-sectional schematic diagram of a belt for a rewinder in the prior art is shown.

[0022] Figure 3 The schematic diagram of the operation of the belt of the prior art rewinding machine running on the roller group is shown.

[0023] Figure 4 A schematic cross-sectional view showing the external shape of a belt for a rewinder according to the utility model.

[0024] Figure 5 Shows Figure 4 The enlarged schematic diagram of the framed area A shows a cross-sectional schematic diagram of the internal structure of the belt for the rewinder according to the utility model.

[0025] Figure 6 The schematic diagram shows the working state of the belt for the rewinding machine according to the utility model running on the roller group according to the utility model.

[0026] Reference numerals list

[0027] W Web

[0028] 300 bottom roller

[0029] 400 center web roll

[0030] 100 rewinding machine

[0031] 110 First Roller

[0032] 111 First Slot

[0033] 120 Second Roller

[0034] 121 Second slot

[0035] 130 belt

[0036] 131 guide rib

[0037] 132 The twisted running path 140 of the guide rib 131 of the belt 130

[0038] W1 width

[0039] W11 Wide

[0040] T1 thickness

[0041] H1 High

[0042] 200 rewinding machine

[0043] 210 First Roller

[0044] 211 First Slot

[0045] 220 Second Roller

[0046] 221 Second slot

[0047] 230 belt

[0048] 231 guide rib

[0049] 2311 side wall

[0050] Virtual extension line of L side wall

[0051] 2312 top wall

[0052] 233 Main layer

[0053] 234 cladding

[0054] 2341 inner cover

[0055] 2342 Outer Covering

[0056] 232 lateral end

[0057] 235 Running path of the guide rib 231 of the belt 230

[0058] R1 radius of groove bottom rounding

[0059] R2 Radius of the top rounding of the guide rib

[0060] α angle

[0061] H2 High

[0062] W2 width

[0063] W3 width

[0064] W4 width

[0065] D-spacing DETAILED DESCRIPTION

[0066] The "longitudinal direction" in the present invention refers to the machine direction when the fiber web machine is running.

[0067] Figure 1 The working schematic diagram of the belt and roller group for the rewinder in the fiber web machine is shown. The web W is guided and wound to the central web roll 400 through the bottom roller 300. The belt 130 wrapped around the first roller 110 and the second roller 120 in an endless shape supports and guides the central web roll 400 for winding.

[0068] Figure 2 , Figure 3 The prior art belt 130 is shown installed on the first roller 110 and the second roller 120 of the roller group, and the guide rib 131 on the inner side of each belt 130 is inserted into the first groove 111 of the first roller 110 and the second groove 121 of the second roller 120 which are aligned with each other. Figure 3 It is also shown that due to the shape error of the first roller 110 and / or the second roller 120 (for example, the axial non-uniformity of the roller), a lateral force 140 is generated on the belt portion in contact with the roller, and the lateral force 140 forces the belt 130 to move in the lateral direction. Figure 3 Also shown is a possible twisted travel path 132 of the guide ribs 131 of the belt 130 .

[0069] Figure 4 The schematic cross-sectional view of the external shape of the belt 230 of the rewinding machine 200 according to the utility model is shown. Compared with the rewinding machine belt 130 of the prior art, which has only one wide and high guide rib 131 (for example, 30-50 mm wide and 5-10 mm high) on the inner side surface, the rewinding machine belt 230 of the utility model has multiple (at least two) narrow and short guide ribs 231 extending in the longitudinal direction of the belt 230 on the inner side surface, the height H2 of the guide rib 231 is 0.5 mm-5 mm, and the width W2 of the guide rib 231 adjacent to the inner side surface of the belt 230 is 0.5 mm-7 mm. After installation, the multiple guide ribs 231 are respectively inserted into the first groove 211 and the second groove 221 (such as Figure 6 It should be noted that the rewinding machine rollers (the first roller 210 and the second roller 220) do not necessarily have to be connected to the Figure 6 Same as Figure 6As shown, the groove widths on the two shafts are different (first groove 211 and second groove 221), but in practice they can be arranged in a desired manner, for example, the groove widths on the two roller shafts can be the same. The width of the guide rib and the groove width can also be the same.

[0070] The applicant has studied the mechanical properties and performance of the belt of the utility model under different operating conditions through different tests. When the belt is not subjected to obvious lateral force (such as the mutual force between the belts in the axial direction), it is found through comparative tests that the technical solution of the utility model has good mechanical properties, wear resistance and service life compared with the prior art. Part of the reason is that each belt 130 of the prior art is only provided with a wide and high guide rib 131 to bear the stress borne by the belt 130 during normal operation (such as the pressure caused by the fiber web on the belt and the friction between the belt and the roller). With the belt structure of the utility model, the stress and friction borne by the multiple guide ribs 231 on each belt 230 are greatly reduced, and when vibration and slight deviation occur, due to the joint action of the multiple guide ribs 231, its structure is more stable, making it less likely that the belt itself will deviate, and the uneven force or local stress caused by the deviation is also reduced accordingly. In other words, the above structure has good mechanical properties, thereby greatly extending the service life of the belt.

[0071] The applicant also conducted an experimental study on the belt of the prior art and the present application when the belt is subjected to a relatively obvious lateral force. The test found that the high and wide guide rib 131 of the prior art is subjected to a relatively obvious lateral force, and the contact surface with the roller groove is subjected to a large bending stress and friction force, and the guide rib 131 is usually subjected to local stress. This local stress causes local rapid wear, thereby greatly reducing the service life of the belt. Different from this, the present invention adopts a short and narrow guide rib 231, so that the bending stress on a single guide rib 231 is reduced. At the same time, the percentage of the contact area of ​​a single guide rib 231 with the roller to its total area is also increased, so that when the force is uneven, the force can be better dispersed on the entire guide rib, thereby increasing the service life of the belt 230. Moreover, each belt 230 of the present invention is provided with a plurality of guide ribs 231. Compared with the prior art in which each belt 130 is provided with only one wide guide rib 131, the bending stress of one or more guide ribs 231 subjected to lateral force can also be dispersed to the other guide ribs 231 of the belt 230. In other words, when one or more guide ribs 231 are subjected to lateral force, the bending stress of the guide ribs 231 on the entirety of each belt 230 of the present invention is relatively balanced, which further improves the service life of the belt 230.

[0072] like Figure 4As shown, the width W3 of the belt 230 of the utility model is 100mm-500mm. The thickness T2 of the base layer S (excluding the guide rib 231) of the belt 230 is 3mm-30mm. The width W4 of the groove G formed between the two guide ribs 231 adjacent to the inner side of the belt 230 (the bottom of the groove) is 5mm-20mm. The height H2 of the guide rib 231 is 0.5mm-5mm, and the width W2 of its bottom is 2mm-7mm. The angle α between the virtual extension line L of the side wall 2311 of the guide rib 231 and the plane where the base layer S is located is 75°-130°. The bottom of the groove G and the side wall 2311 of the guide rib 231 can be chamfered. The two sides of the top of the guide rib formed by the connection between the two side walls 2311 of the guide rib 231 and the top wall 2312 can also be chamfered. Compared with non-rounded transition, the rounded transition can further increase the contact area between the belt 230 and the roller, which is conducive to dispersing the stress on the belt 230, which can also increase the service life of the belt 230. Generally, the cross section of the guide rib 231 is wedge-shaped or trapezoidal. The length (not shown) of a single belt 230 of the utility model can be 2000mm-3500mm.

[0073] Figure 5 Shows Figure 4The enlarged schematic diagram of the framed area A in the figure shows a cross-sectional schematic diagram of the internal structure of the belt 230 of the rewinding machine 200 according to the present invention. The belt 230 according to the present invention is a reinforcement layer including polyurethane and fabric. The inner and outer sides of the belt 230 are covered with thermoplastic polyurethane elastomer, and the inner surface also has a plurality of guide ribs 231 made of the same polyurethane material, and the fabric is between the inner and outer sides of the belt 230. The outer surface of the belt 230 may be provided with an exhaust groove (not shown in the figure). The exhaust groove is provided to remove the air between the fiber web and the belt, and also to allow the air wound in the roller to pass through the nip. To avoid the formation of an air pocket between the outer layer of the roller in front of the nip groove and the rest of the roller, the fiber web forms a controlled channel, allowing air to pass through the nip and be discharged from the end of the roller. The fabric is woven with yarn along the travel direction (longitudinal direction) and transverse direction of the belt 230, that is, woven with warp and weft, the warp is the running direction (longitudinal direction), and the weft is the transverse direction. The weaving method can be plain weave or other suitable weaving forms. Polyurethane is melted and filled with fabric from the inner and outer sides of the belt 230, so that a coating 234 is formed on the surface of the inner and outer sides of the belt 230, and the coating has good wear resistance. Since the polyurethane material has good wear resistance, it is used as a surface layer that bears friction (the outer surface bears the friction of the fiber web, and the inner surface bears the friction of the roller), which further improves the service life of the belt 230. The fabric melted and filled with polyurethane from the inner and outer sides of the belt 230 also increases the strength of the belt 230, which also improves the service life of the belt 230. In general, the belt 230 according to the utility model includes a main body layer 233 and a coating 234 covering the inner and outer sides of the main body layer 233. In one embodiment, the coating 234 includes an inner coating 2341 and an outer coating 2342, the inner coating 2341 includes a guide rib 231, and the materials of the inner coating 2341 and the outer coating 2342 are the same or different.

[0074] Figure 6 As a further improvement of the present invention, a schematic diagram of the belt 230 of the rewinding machine 200 according to the present invention running on the first roller 210 and the second roller 220 of the roller group with different groove widths is shown. It should be noted that the belt of the present invention can be used not only for Figure 6 The roller set shown can also be used for other roller sets, as long as the roller set is provided with corresponding roller grooves to accommodate the guide ribs 231. It is not required that the width of the roller grooves must be the same as the guide ribs, nor that the widths of the roller grooves on the two rollers must be the same or different. Figure 6As shown, it is a further improvement of the present application, the first groove 211 on the first roller 210 is wider than the second groove 221 on the second roller 220, and the first groove 211 of the first roller 210 is also wider than the guide rib 231 of the belt 230. In the case that the shape of the first roller 210 and / or the second roller 220 is defective (for example, an uneven roller surface) and a lateral force 140 acting on the belt 230 is generated, the belt 230 can be slightly displaced in the lateral direction (such as the first groove 211) of the first roller 210 on the basis of multiple guide ribs 231 dispersing the force and reducing wear. Figure 6 The above slight displacement avoids excessive squeezing of the guide ribs and the roller contact surface, reduces the axial stress of the guide ribs to a certain extent, thereby preventing the guide ribs and the inner surface of the belt 230 from wearing prematurely, and also preventing damage to the fiber web carried by the belt 230.

[0075] Through tests, it is found that the service life of the belt is significantly improved by using the rewinder belt and / or roller assembly of the utility model. Under normal mechanical wear conditions, if the friction coefficient of the fiber web is less than 0.5, the expected service life of the rewinder belt exceeds 12 months, and if the friction coefficient of the fiber web is 0.5 or greater, the corresponding service life is 9 months. By using the rewinder belt and roller assembly of the utility model, the waste rolls caused by the belt groove marks (longitudinal direction) of the fiber web roll caused by the rewinder belt grooves are also reduced by more than 60%.

Claims

1. A belt (230) for a rewinding machine, characterized in that: The belt (230) includes a main body layer (233) and a covering layer (234) covering the main body layer (233). The coating comprises an inner coating (2341) and an outer coating (2342), The inner cover (2341) includes at least two guide ribs (231) extending in the longitudinal direction of the belt (230).

2. The belt (230) for a rewinding machine according to claim 1, characterized in that: The height (H2) of the guide rib (231) is 0.5 mm to 5 mm, and the width (W2) of the guide rib (231) adjacent to the inner side surface of the belt (230) is 0.5 mm to 7 mm.

3. The belt (230) for a rewinding machine according to claim 1, characterized in that: The width (W4) of the bottom of the groove (G) formed between the two guide ribs (231) is 5 mm to 20 mm.

4. The belt (230) for a rewinding machine according to claim 3, characterized in that: The connection between the bottom of the groove (G) and the side wall (2311) of the guide rib (231) is a chamfered transition and / or the connection between the two side walls (2311) of the guide rib (231) and the top wall (2312) forms a chamfered transition on both sides of the top of the guide rib.

5. The belt (230) for a rewinding machine according to claim 1, characterized in that: The outer surface of the belt (230) is provided with an exhaust groove.

6. The belt (230) for a rewinding machine according to claim 1, characterized in that: The angle (α) between the virtual extension line (L) of the side wall (2311) of the guide rib (231) and the plane where the base layer (S) of the belt (230) excluding the guide rib (231) is located is 75°-130°.

7. The belt (230) for a rewinding machine according to claim 1, characterized in that: The cross section of the guide rib (231) is wedge-shaped or trapezoidal.

8. The belt (230) for a rewinder as claimed in claim 6, characterized in that: The thickness (T2) of the base layer (S) is 3 mm to 30 mm.

9. The belt (230) for a rewinder according to any one of claims 1 to 8, characterized in that: The inner covering layer (2341) and the outer covering layer (2342) are polyurethane, the main body layer (233) is fabric, and the polyurethane is melted and filled into the fabric from the inner and outer sides of the belt (230).

10. A roller set for a rewinding machine, characterized in that: The invention comprises a first roller (210) and a second roller (220) for supporting a rewinding belt (230) according to any one of claims 1 to 9, wherein the first roller (210) is provided with a first groove (211) for receiving a guide rib (231) of the belt (230), and the second roller (220) is provided with a second groove (221) for receiving the guide rib (231) of the belt (230), and the first groove (211) is wider than the second groove (221), and the first groove (211) is also wider than the guide rib (231) of the belt (230).

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