A calendering roll for a biodegradable film

Abstract

This utility model discloses a calendering roller for a biodegradable membrane, comprising: an outer cylinder, which is a hollow structure, including a cylindrical first cylinder body and first end plates disposed at both ends of the first cylinder body; a central shaft, which is a solid structure, coaxially arranged with the outer cylinder and welded to the first end plates; an inner support assembly, disposed between the central shaft and the outer cylinder, including at least two annular stiffeners and multiple connecting sleeves, the number of connecting sleeves being one more than the number of annular stiffeners, the multiple connecting sleeves being axially distributed along the central shaft and coaxially arranged with the central shaft; the annular stiffeners are disposed between two adjacent connecting sleeves, the inner and outer rings of the annular stiffeners being welded to the central shaft and the outer cylinder respectively, and the ends of the connecting sleeves being welded to the sides of the annular stiffeners; the end faces of the two connecting sleeves located at both ends are provided with second end plates, the second end plates being welded to the central shaft. This design maintains the lightweight design of the roller while significantly improving its overall rigidity.

Description

Technical Field

[0001] This utility model relates to the technical field of biodegradable membrane production equipment, and in particular to a calendering roller for a biodegradable membrane. Background Technology

[0002] With environmental awareness growing stronger, biodegradable films, as an ideal alternative to traditional plastic films, have been widely used in packaging, agriculture, and medical fields. In their production, calendering is one of the key steps in film formation. This process uses the synergistic action of multiple sets of rollers to roll molten biodegradable material into a film of a certain thickness and width.

[0003] In the calendering process, the dimensional parameters of the pressure roller are closely related to the width of the biodegradable film. To meet market demand for wide-width biodegradable films (e.g., approximately 3 meters wide), the length of the pressure roller must match the film width, i.e., the roller length is approximately 3 meters. However, this dimensional requirement presents a significant challenge to the design of the pressure roller: if the pressure roller is designed as a solid structure, its overall weight will increase significantly, placing extremely high demands on the load-bearing capacity of the production equipment and making it difficult to rotate the roller, hindering stable and efficient film pressing. If a hollow structure is used to reduce weight, its large volume results in insufficient overall rigidity, making it susceptible to deformation during calendering due to material pressure and its own weight, leading to uneven thickness of the pressed biodegradable film and severely affecting film quality. Utility Model Content

[0004] In view of this, the present invention proposes a calendering roller for a biodegradable membrane, with the aim of reducing the weight of the calendering roller while ensuring its sufficient structural stability.

[0005] The solution provided by this utility model includes:

[0006] A calendering roller for a biodegradable film, comprising:

[0007] The outer cylinder is a hollow structure, comprising a cylindrical first cylinder and first end plates disposed at both ends of the first cylinder;

[0008] The central shaft is a solid structure, and is coaxially arranged with the outer cylinder, and is welded to the first end plate;

[0009] An inner support assembly, disposed between the central shaft and the outer cylinder, includes at least two annular stiffening plates and multiple connecting sleeves. The number of connecting sleeves is one more than the number of annular stiffening plates. The multiple connecting sleeves are axially distributed on the central shaft and coaxially arranged with the central shaft. The annular stiffening plates are disposed between two adjacent connecting sleeves. The inner and outer rings of the annular stiffening plates are welded to the central shaft and the outer cylinder, respectively. The ends of the connecting sleeves are welded to the sides of the annular stiffening plates. The end faces of the two connecting sleeves located at both ends are provided with second end plates, which are welded to the central shaft.

[0010] As a further optional solution, the annular stiffener, the first end plate, and the second end plate are arranged in parallel and are all perpendicular to the central axis.

[0011] As a further optional solution, both ends of the central shaft extend at least partially beyond the outer cylinder, and the portion of the central shaft extending beyond the outer cylinder is provided with a shoulder.

[0012] As a further optional solution, the outer periphery of the connecting sleeve is also provided with a plurality of support portions that are equidistantly spaced along the circumference;

[0013] The support portion includes a connecting plate and a supporting arc plate, both of which are arranged along the length of the connecting sleeve. The connecting plate is arranged radially along the connecting sleeve, with its inner edge fixedly connected to the outer periphery of the connecting sleeve and its outer edge fixedly connected to the inner side of the supporting arc plate. The outer side of the supporting arc plate matches the contour of the inner wall of the outer cylinder, so that the outer side of the supporting arc plate fits against the inner wall of the outer cylinder.

[0014] As a further alternative, the supports on two adjacent connecting sleeves are axially offset.

[0015] As a further optional solution, the connecting sleeve is also provided with an inner support plate, which corresponds one-to-one with the connecting plate. One end of the inner support plate is welded to the inner wall of the connecting sleeve, and the other end is welded to the central shaft.

[0016] Compared with the prior art, the calendering roller of the biodegradable film of this application has at least the following advantages:

[0017] The hollow outer cylinder effectively reduces its size and weight, avoiding the problems of excessive equipment load and difficulty in rotation caused by a solid structure. Meanwhile, the solid central shaft serves as the core support unit, forming a rigid skeleton with the internal support components, significantly improving the hollow outer cylinder's resistance to deformation. Annular stiffeners are directly welded between the central shaft and the outer cylinder, forming multiple annular reinforcing rings that effectively disperse the radial pressure generated during calendering. The connecting sleeves, through an axially spaced distribution design, ensure the overall continuity of the internal support components while strengthening the connection with the central shaft. Through the synergistic effect of the outer cylinder, central shaft, and internal support components, the lightweight design of the rollers (compared to solid rollers) is maintained while its overall rigidity is significantly improved. This ensures that the rollers are less prone to deformation when calendering wide-width biodegradable films, promoting uniform thickness of the extruded biodegradable film and improving film quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a calendering roller for a biodegradable membrane according to an embodiment of the present invention;

[0019] Figure 2 This is an exploded schematic diagram of the calendering roller of a biodegradable membrane according to an embodiment of this utility model;

[0020] Figure 3 This is an exploded view of the inner support component and the central shaft in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram showing the axial positional distribution of the support portions on two adjacent connecting sleeves in an embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of the abutting fit between the support portion on the connecting sleeve and the outer cylinder in an embodiment of this utility model;

[0023] Figure 6 This is a cross-sectional schematic diagram of a calendering roller for a biodegradable membrane according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the connecting sleeve in another embodiment of the present invention;

[0025] In the diagram: 1. Outer cylinder; 11. First cylinder body; 12. First end plate;

[0026] 2. Central shaft; 21. Shoulder;

[0027] 4. Internal support assembly; 41. Annular stiffening plate; 42. Connecting sleeve; 42a. Intermediate connecting sleeve; 42b. End connecting sleeve; 421. Support part; 4211. Connecting plate; 4212. Support arc plate; 422. Second end plate; 423. Internal support plate. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] refer to Figure 1-6 An exemplary embodiment shows a calendering roller for a biodegradable film, including an outer cylinder 1, a central shaft 2, and an inner support assembly 4;

[0033] The outer cylinder 1 is a hollow structure, comprising a cylindrical first cylinder 11 and first end plates 12 disposed at both ends of the first cylinder 11; the central shaft 2 is a solid structure, coaxially arranged with the outer cylinder 1, and welded to the first end plates 12; the inner support assembly 4 is disposed between the central shaft 2 and the outer cylinder 1, comprising at least two annular stiffening plates 41 and multiple connecting sleeves 42, wherein the number of connecting sleeves 42 is one more than the number of annular stiffening plates 41, and the multiple connecting sleeves 42 are axially distributed on the central shaft 2 and coaxially arranged with the central shaft 2; the annular stiffening plates 41 are disposed between two adjacent connecting sleeves 42, and the inner and outer rings of the annular stiffening plates 41 are respectively welded to the central shaft 2 and the outer cylinder 1, and the ends of the connecting sleeves 42 are welded to the sides of the annular stiffening plates 41; the end faces of the two connecting sleeves 42 located at both ends are provided with second end plates 422, and the second end plates 422 are welded to the central shaft 2.

[0034] For ease of description, such as Figure 3 As shown, the connecting sleeves 42 located at both ends are called end connecting sleeves 42b, while the connecting sleeves 42 not located at the ends are called intermediate connecting sleeves 42a. There is at least one intermediate connecting sleeve 42a, and both ends of it are open. The end connecting sleeve 42b has a second end plate 422 at one end and is open at the other end.

[0035] Specifically, the hollow structure of the outer cylinder 1 effectively reduces its volume and weight, avoiding the problems of excessive equipment load and difficulty in rotation caused by a solid structure. Meanwhile, the solid structure of the central shaft 2 serves as the core support unit, forming a rigid frame with the inner support assembly 4, significantly improving the deformation resistance of the hollow outer cylinder 1. The annular stiffening plate 41 is directly welded between the central shaft 2 and the outer cylinder 1, forming multiple annular reinforcing hoops that effectively disperse the radial pressure generated during calendering. The connecting sleeve 42, through its axially spaced distribution design, ensures both the overall continuity of the inner support assembly 4 and strengthens the connection with the central shaft 2. Through the synergistic effect of the outer cylinder 1, the central shaft 2, and the inner support assembly 4, the lightweight design of the roller is maintained while its overall rigidity is significantly improved. This ensures that the roller is less prone to deformation when calendering wide-width biodegradable films, which is beneficial for producing biodegradable films with uniform thickness and improving film quality.

[0036] In this embodiment, the appendix is ​​attached. Figure 2 , Figure 3 and Figure 6The structure shown includes two annular stiffening plates 41 and three connecting sleeves 42. In other embodiments, it may also include three annular stiffening plates 41 and four connecting sleeves 42, or four annular stiffening plates 41 and five connecting sleeves 42, and so on. Predictably, the more annular stiffening plates 41 and connecting sleeves 42 there are, the higher the structural stability, but the weight also increases accordingly. Preferably, the number of annular stiffening plates 41 is designed to be 2-5, which provides a better balance between structural stability and weight.

[0037] In the above scheme, the annular rib plate 41, the first end plate 12, and the second end plate 422 are arranged in parallel and are all perpendicular to the central axis 2. The planar structural layout of the annular rib plate 41, the second end plate 422, and the second end plate 422 perpendicular to the central axis 2 ensures the dynamic balance stability of the calendering roller during high-speed rotation. The rotating mass distribution formed by the annular rib plate 41, the second end plate 422, and the second end plate 422 is axisymmetric, which avoids vibration noise caused by mass eccentricity.

[0038] In the above scheme, both ends of the central shaft 2 extend at least partially beyond the outer cylinder 1, and the portion of the central shaft 2 extending beyond the outer cylinder 1 is provided with a shoulder 21. During installation, the shoulder 21 can be used for bearing positioning, facilitating the transmission installation of the central shaft 2.

[0039] In some embodiments, such as Figure 2-5 As shown, the outer periphery of the connecting sleeve 42 is also provided with a plurality of support portions 421 equidistantly spaced along the circumference; the support portion 421 includes a connecting plate 4211 and a support arc plate 4212. The connecting plate 4211 and the support arc plate 4212 are both arranged along the length of the connecting sleeve 42. The connecting plate 4211 is arranged radially along the connecting sleeve 42. The inner edge of the connecting plate 4211 is fixedly connected to the outer periphery of the connecting sleeve 42, and its outer edge is fixedly connected to the inner side of the support arc plate 4212. The outer side of the support arc plate 4212 matches the contour of the inner wall of the outer cylinder 1 so that the outer side of the support arc plate 4212 fits against the inner wall of the outer cylinder 1.

[0040] Multiple support parts 421 are arranged at equal intervals along the circumference of the connecting sleeve 42, and are fixedly connected to the connecting sleeve 42 via connecting plates 4211. They also abut against the inner wall of the outer cylinder 1 with the aid of supporting arc plates 4212, forming a multi-point support structure from the connecting sleeve 42 to the outer cylinder 1. This spaced arrangement ensures effective support for the outer cylinder 1 while avoiding excessive weight gain due to overly dense structures, achieving a balance between lightweight design and structural stability. Simultaneously, it makes the force transmission between the connecting sleeve 42 and the outer cylinder 1 more direct and uniform, avoiding localized stress concentration. When the outer cylinder 1 is subjected to external forces, the force can be transmitted more evenly to the internal structure (internal support assembly 4 and central shaft 2), effectively distributing the pressure borne by the outer cylinder 1 and improving its resistance to deformation.

[0041] Preferably, the support portions 421 on two adjacent connecting sleeves 42 are staggered in the axial direction. This staggered arrangement results in a more dispersed and uniform distribution of support points for the support portions 421 within the axial range of the calendering roll. This avoids the overlapping and concentration of support portions 421 in the axial position, thereby ensuring that the inner wall of the outer cylinder 1 receives effective support from the support portions 421 at different axial positions, further improving the overall uniformity of support for the outer cylinder 1.

[0042] Preferably, to further strengthen the structural connection between the connecting sleeve 42 and the central shaft 2, such as... Figure 7 As shown, the connecting sleeve 42 is further provided with an inner support plate 423, which corresponds one-to-one with the connecting plate 4211. One end of the inner support plate 423 is welded to the inner wall of the connecting sleeve 42, and the other end is welded to the central shaft 2. In this way, the structural stability of the connecting sleeve 42 and the central shaft 2 can be improved.

[0043] In summary, this application provides a calendering roller for biodegradable films. The outer cylinder employs a hollow structure, effectively reducing its volume and weight, and avoiding the excessive equipment load and rotation difficulties caused by a solid structure. Simultaneously, the central shaft uses a solid structure as the core support unit, forming a rigid skeleton with the inner support assembly, significantly improving the deformation resistance of the hollow outer cylinder. Annular reinforcing plates are directly welded between the central shaft and the outer cylinder, forming multiple annular reinforcing hoops, effectively dispersing the radial pressure generated during calendering. The connecting sleeve, through its axially spaced distribution design, ensures both the overall continuity of the inner support assembly and strengthens the connection with the central shaft. Through the synergistic effect of the outer cylinder, central shaft, and inner support assembly, the roller's lightweight design is maintained while its overall rigidity is significantly improved. This ensures that the roller is less prone to deformation when calendering wide-width biodegradable films, which is beneficial for producing biodegradable films with uniform thickness and improving film quality.

[0044] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A calender roll for biodegradable films, characterized in that include: The outer cylinder is a hollow structure, comprising a cylindrical first cylinder and first end plates disposed at both ends of the first cylinder; The central shaft is a solid structure, and is coaxially arranged with the outer cylinder, and is welded to the first end plate; An inner support assembly, disposed between the central shaft and the outer cylinder, includes at least two annular stiffening plates and multiple connecting sleeves. The number of connecting sleeves is one more than the number of annular stiffening plates. The multiple connecting sleeves are axially distributed on the central shaft and coaxially arranged with the central shaft. The annular stiffening plates are disposed between two adjacent connecting sleeves. The inner and outer rings of the annular stiffening plates are welded to the central shaft and the outer cylinder, respectively. The ends of the connecting sleeves are welded to the sides of the annular stiffening plates. The end faces of the two connecting sleeves located at both ends are provided with second end plates, which are welded to the central shaft.

2. The calendering roller for the biodegradable membrane according to claim 1, characterized in that: The annular stiffener, the first end plate, and the second end plate are arranged in parallel and are all perpendicular to the central axis.

3. The calendering roller for the biodegradable membrane according to claim 1, characterized in that: Both ends of the central shaft extend at least partially beyond the outer cylinder, and the portion of the central shaft extending beyond the outer cylinder is provided with a shoulder.

4. The calendering roller for the biodegradable membrane according to claim 1, characterized in that: The outer periphery of the connecting sleeve is also provided with multiple support parts that are equidistantly spaced along the circumference. The support portion includes a connecting plate and a supporting arc plate, both of which are arranged along the length of the connecting sleeve. The connecting plate is arranged radially along the connecting sleeve, with its inner edge fixedly connected to the outer periphery of the connecting sleeve and its outer edge fixedly connected to the inner side of the supporting arc plate. The outer side of the supporting arc plate matches the contour of the inner wall of the outer cylinder, so that the outer side of the supporting arc plate fits against the inner wall of the outer cylinder.

5. The calendering roller for the biodegradable membrane according to claim 4, characterized in that: The supports on two adjacent connecting sleeves are axially offset.

6. The calendering roller for the biodegradable membrane according to claim 4, characterized in that: The connecting sleeve is also provided with an inner support plate, which corresponds one-to-one with the connecting plate. One end of the inner support plate is welded to the inner wall of the connecting sleeve, and the other end is welded to the central shaft.

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