Roll changing hollow shaft and high-speed paper machine

Abstract

The utility model discloses a roll changing hollow shaft and a high-speed paper machine. The roll changing hollow shaft comprises a hollow shaft body, the hollow shaft body is sequentially provided with a first connecting part, a middle part and a second connecting part along the axial direction of the hollow shaft body; the periphery of the middle part is sequentially covered with a rubber layer and a Teflon adhesive layer from inside to outside; the outer diameter of the Teflon pasting layer is larger than the diameter of the first connecting part. The outer diameter of the Teflon pasting layer is larger than the diameter of the second connecting part. The utility model can fill up the defects in the later period of the service life of the hollow shaft, achieve continuous on-machine use, and do not affect normal production.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed paper machines, in particular to an empty roll-changing shaft and a high-speed paper machine. Background Art

[0002] In the reeling section of a papermaking workshop, glue is sprayed onto a hollow shaft during the reeling process. The existing hollow shafts are made of rubber. Due to prolonged compression and uneven stress, these materials can develop cracks and holes. Defects in the hollow shaft's center can easily lead to roll-changing failures. The high surface roughness of the hollow shafts also makes glue cleaning difficult and increases employee workload.

[0003] Nowadays, high-speed paper machines use water-jet machines to change rolls in the middle. The thickness in the middle is high, which makes it easy for cracks and holes to appear due to squeezing. When defects occur, the only solution is to send the paper to the manufacturer for maintenance, re-gluing or partial repair (partial repair has a short service life). In addition, the cost of re-gluing is extremely high, and sending the paper to the factory for maintenance takes a long time.

[0004] How to solve one of the above problems is one of the important issues to be solved urgently in this field. Utility Model Content

[0005] The utility model aims to provide a reel-changing hollow shaft to solve the deficiencies in the prior art and to extend the service life of the hollow shaft.

[0006] The utility model provides a hollow shaft for reel replacement, which comprises a hollow shaft body;

[0007] The hollow shaft body is provided with a first connecting portion, a middle portion and a second connecting portion in sequence along the axial direction thereof;

[0008] The outer periphery of the middle portion is sequentially covered with a rubber layer and a Teflon layer from the inside to the outside;

[0009] The outer diameter of the Teflon layer is greater than the diameter of the first connecting portion; the outer diameter of the Teflon layer is greater than the diameter of the second connecting portion.

[0010] As for the reel-changing empty shaft as described above, optionally, the Teflon layer is adhered to the outer periphery of the middle portion by gluing.

[0011] As described above, for the reel-changing empty shaft, optionally, the thickness of the Teflon layer is between 0.1 and 0.2 mm.

[0012] As described above, for the reel-changing hollow shaft, optionally, the diameter of the middle portion of the hollow shaft body is smaller than the diameter of the first connecting portion, and the diameter of the middle portion of the hollow shaft body is smaller than the diameter of the second connecting portion.

[0013] As for the reel-changing hollow shaft as described above, optionally, the outer diameter of the rubber layer is not less than the diameter of the first connecting portion, and the outer diameter of the rubber layer is not less than the diameter of the second connecting portion.

[0014] As for the empty shaft for reel replacement as described above, optionally, the diameter of the first connecting portion is equal to the diameter of the second connecting portion.

[0015] The utility model provides a high-speed paper machine, which comprises any one of the above-mentioned empty roll-changing shafts.

[0016] Compared to existing technologies, this invention utilizes a Teflon coating on the outer periphery of the rubber layer to address the defects of the hollow shaft at the end of its service life, enabling continued use without affecting normal production. This extends the service life of the hollow shaft compared to using the rubber layer directly. The Teflon coating is easily replaceable, reducing the possibility of roll change failures and reducing cleaning workload for employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 It is a schematic structural diagram of the cross section of the present invention.

[0019] Description of reference numerals:

[0020] 1-Hollow shaft body;

[0021] 11 - first connecting part, 12 - middle part, 13 - second connecting part;

[0022] 121 - rubber layer, 122 - Teflon layer. DETAILED DESCRIPTION

[0023] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In order to solve the problems raised in the background technology, the present invention provides the following solutions.

[0025] Example 1

[0026] Please refer to Figure 1 and Figure 2 This embodiment provides a hollow shaft for reel replacement, which includes a hollow shaft body 1. In specific implementation, the hollow shaft body 1 has the same structure as the hollow shaft in the prior art.

[0027] The hollow shaft body 1 is provided with a first connecting portion 11, a middle portion 12, and a second connecting portion 13 along its axial direction. In practice, the first and second connecting portions 11 and 13 are located at opposite ends of the middle portion 12 and are used to connect to other components. The connection method is the same as in the prior art and will not be further described here.

[0028] The main improvement of this utility model lies in the outer periphery of the central portion 12 being covered sequentially from the inside out with a rubber layer 121 and a Teflon coating 122. In practice, the rubber layer 121 of the central portion 12 can be similar to the prior art. In the prior art, the outer periphery of the rubber layer 121 is free of other components. After prolonged extrusion, uneven stress can cause defects such as cracks and holes in the rubber layer 121. Defects in the rubber layer 121 can lead to roll change failures. Furthermore, the rough surface of the hollow shaft makes glue cleaning difficult and increases employee labor. If defects in the rubber layer 121 develop, applying the Teflon coating 122 can fill these defects at the end of the hollow shaft's service life, ensuring continued use without disrupting normal production. The Teflon adhesive is easily replaceable, reducing the likelihood of roll change failures and the labor required for cleaning. Alternatively, the Teflon coating 122 can be applied to the outer periphery of the rubber layer 121 from the outset of manufacturing. In this way, the service life can be extended, roll change failure can be effectively avoided, maintenance costs can be reduced, and the labor intensity of employees can be reduced.

[0029] In practice, the outer diameter of the Teflon layer 122 is larger than the diameter of the first connecting portion 11; the outer diameter of the Teflon layer 122 is also larger than the diameter of the second connecting portion 13. This makes it suitable for high-speed paper machines and facilitates mid-roll changes. Applying the Teflon layer 122 eliminates surface defects in the rubber layer 121, eliminating the need for factory maintenance, re-wrapping, or partial repairs (which have a short service life). This avoids the high cost of re-wrapping and the time-consuming and time-consuming process of returning the rubber layer to the factory for maintenance.

[0030] In a specific implementation, the Teflon layer 122 is adhered to the periphery of the middle portion 12 by gluing. In the implementation process, the Teflon layer 122 can be a Teflon tape, or a layer of Teflon material fixed to the periphery of the rubber layer 121 by gluing. Of course, in some implementations, the Teflon material can also be directly sprayed on the surface of the rubber layer 121 to form a Teflon material layer.

[0031] In a specific implementation, the thickness of the Teflon layer 122 is between 0.1 and 0.2 mm. Preferably, the thickness of the Teflon layer 122 can be 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, or 0.2 mm, etc. Among them, the thickness of the Teflon layer 122 is preferably 0.13 mm to 0.15 mm.

[0032] In a specific implementation, the diameter of the middle portion 12 of the hollow shaft body 1 is smaller than the diameter of the first connecting portion 11, and the diameter of the middle portion 12 of the hollow shaft body 1 is smaller than the diameter of the second connecting portion 13. Preferably, in one implementation, the diameter of the first connecting portion 11 is equal to the diameter of the second connecting portion 13. This can limit the axial position of the rubber layer, preventing the rubber layer 121 from sliding or misaligning in the axial direction.

[0033] The outer diameter of the rubber layer 121 is not less than the diameter of the first connecting portion 11, and the outer diameter of the rubber layer 121 is not less than the diameter of the second connecting portion 13. In this way, the entire structure can be adapted to adjust a paper machine.

[0034] Example 2

[0035] This embodiment is a specific application of the first embodiment, and the similarities are not repeated here, and only the differences are described below.

[0036] This embodiment provides a high-speed paper machine including the roll-changing hollow shaft described in Example 1. By adding a Teflon coating to the outer circumference of the hollow shaft, roll-changing failures can be effectively resolved, maintenance costs can be reduced, employee labor intensity can be reduced, and the service life of the hollow shaft can be extended.

[0037] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. An empty shaft for reel replacement, characterized by: It comprises a hollow shaft body (1); The hollow shaft body (1) is provided with a first connecting portion (11), a middle portion (12) and a second connecting portion (13) in sequence along the upper axis direction thereof; The outer periphery of the middle portion (12) is sequentially covered with a rubber layer (121) and a Teflon layer (122) from the inside to the outside; The outer diameter of the Teflon layer (122) is greater than the diameter of the first connecting portion (11); the outer diameter of the Teflon layer (122) is greater than the diameter of the second connecting portion (13).

2. The empty shaft for reel replacement according to claim 1, characterized in that: The Teflon layer (122) is adhered to the outer periphery of the middle portion (12) by gluing.

3. The empty shaft for reel replacement according to claim 2, characterized in that: The thickness of the Teflon layer (122) is between 0.1 and 0.2 mm.

4. The empty shaft for reel replacement according to claim 3, characterized in that: The diameter of the middle portion (12) of the hollow shaft body (1) is smaller than the diameter of the first connecting portion (11), and the diameter of the middle portion (12) of the hollow shaft body (1) is smaller than the diameter of the second connecting portion (13).

5. The empty shaft for reel replacement according to claim 4, characterized in that: The outer diameter of the rubber layer (121) is not less than the diameter of the first connecting portion (11), and the outer diameter of the rubber layer (121) is not less than the diameter of the second connecting portion (13).

6. The empty shaft for reel replacement according to claim 5, characterized in that: The diameter of the first connecting portion (11) is equal to the diameter of the second connecting portion (13).

7. A high-speed paper machine, characterized in that: The invention comprises the empty roll-changing shaft as described in any one of claims 1 to 6.

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