A winding press roller

Abstract

This utility model discloses a winding pressure roller, comprising: an outer roller, an elastic layer covering the outer circumferential surface of the outer roller, and a left and right shaft head of the pressure roller, which are coaxially assembled inside the outer roller. The left shaft head includes a left first section and a left second section arranged along its axial direction, and the right shaft head includes a right first section and a right second section arranged along its axial direction. The outer circumferences of the left first section and the right first section are respectively connected to the inner wall of the outer roller; gaps are formed between the outer circumferences of the left second section and the right second section and the inner wall of the outer roller. When the left and right shaft heads are assembled inside the outer roller, a certain gap is left between their opposing inner end faces. This utility model's winding pressure roller, through its split shaft head and key gap design, effectively avoids the direct impact of shaft head deformation on the outer roller, ensuring uniform pressure transmission, thereby improving winding quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of film winding technology, and more specifically, to a winding pressure roller. Background Technology

[0002] The winding pressure roller is a key component ensuring the flatness of the material during winding. In the winding process of thin materials such as diaphragms, pressure rollers are typically added to avoid uneven air gaps between the films. The surface structure of the pressure roller is usually a soft, elastic layer. Appropriate pressure is generally applied to the bearing seats on both sides of the roller head via a cylinder. The pressure roller presses the film against the surface of the winding roller, ensuring a tight fit between the film layers. This prevents uneven air gaps from causing bulging and wrinkles in the roll, effectively improving the stability and quality of the winding process.

[0003] Currently, existing pressure roller devices have different structures. One type has a uniformly thick elastic layer on the roller surface, with shaft ends on both sides of the roller, applying pressure by means of bearing positions on both sides of the roller. The disadvantage of this structure is that when pressure is applied to the bearing positions on both sides, for rollers with a large length-to-diameter ratio, the roller is similar to a simply supported beam structure, which is prone to large bending deformation in the middle, resulting in a significant non-uniform pressure distribution along the axial direction. Due to the limitations of the material's bending deformation characteristics, the middle region of the roller body experiences a pressure attenuation zone due to insufficient effective pressure, preventing effective air venting and the formation of a dense roll material in this area. Another type of pressure roller device has an inconsistent thickness of the elastic layer on the roller surface, with the thickness of the elastic layer decreasing sequentially from the middle to both ends. The shaft ends are also on both sides of the roller, and pressure is also applied to the bearing positions on both sides of the roller. While this solution aims to compensate for pressure by varying the thickness of the elastic layer, it requires consideration of numerous factors, such as material properties, working load pressure, and roller dimensions. These factors all influence the thickness of the elastic layer, and only by effectively controlling the thickness of the elastic layer can the effects of effectively expelling surface air and ensuring winding stability be achieved. Therefore, this solution is difficult to implement. In the aforementioned existing technology, the pressure rollers, with their shafts located on both sides of the roller and typically being a single unit, are prone to overall bending deformation under pressure. This results in uneven pressure distribution along the roller's axial direction, particularly in the central region of the roller, where pressure is lower. This prevents the film from adhering tightly to the winding roller, easily forming uneven air layers between the films. Ultimately, this leads to quality problems such as bulging and wrinkles in the entire roll of film after winding.

[0004] Therefore, how to provide a winding roller that can effectively solve the problem of uneven pressure along the axial direction and avoid bulging and wrinkling of the film after winding has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to provide a winding pressure roller that can effectively solve the problem of uneven pressure along the axial direction of the pressure roller and avoid problems such as bulging and wrinkling of the film after winding.

[0006] This utility model provides a winding pressure roller, including an outer roller, an elastic layer covering the outer peripheral surface of the outer roller, and a left and right shaft head of the pressure roller, which are coaxially assembled inside the outer roller. The left shaft head includes a left first section and a left second section arranged along its axial direction, and the right shaft head includes a right first section and a right second section arranged along its axial direction. The outer peripheries of the left first section and the right first section are respectively connected to the inner wall of the outer roller. The outer peripheries of the left second section and the right second section are respectively connected to the inner wall of the outer roller. A gap is formed between the outer peripheries of the left second section and the inner wall of the outer roller.

[0007] Optionally, the outer periphery of the left first segment and the outer periphery of the right first segment are respectively connected to the inner wall of the outer roller by an interference fit.

[0008] Optionally, a left transition segment is formed between the first left segment and the second left segment, and the outer diameter of the left transition segment gradually decreases along the direction from the first left segment to the second left segment; a right transition segment is formed between the first right segment and the second right segment, and the outer diameter of the right transition segment gradually decreases along the direction from the first right segment to the second right segment.

[0009] Optionally, the free ends of the left and right shafts of the pressure roller extend outwards to both ends of the outer roller.

[0010] Optionally, when the left and right shaft ends of the pressure roller are assembled inside the outer roller, a certain gap is left between their respective inner end faces.

[0011] Optionally, the elastic layer is a rubber layer, which is fixedly wrapped around the outer peripheral surface of the outer roller.

[0012] Based on the technical content disclosed in this utility model, the following beneficial effects are achieved:

[0013] The winding pressure roller provided by this utility model solves the problem of uneven axial pressure in existing technologies by employing separate left and right shaft heads, coaxially assembled inside the outer roller. Specific gaps are provided between the outer periphery of the second left section of the left shaft head and the outer periphery of the second right section of the right shaft head and the inner wall of the outer roller. Firstly, the separate left and right shaft head design, compared to the traditional one-piece long shaft, improves the bending deformation mode when pressure is applied at both ends, making it less prone to significant overall bending that affects the entire roller length. Secondly, and more importantly, the gaps between the left and right second sections and the inner wall of the outer roller act as deformation isolation; this means that even if the left or right shaft head itself undergoes slight bending under stress, this gap ensures that such bending deformation is not directly transmitted to the outer roller, preventing shaft head deformation from interfering with the shape of the outer roller. Therefore, the outer roller can more effectively resist deformation during operation, maintaining its cylindricity and straightness, and thus applying more uniform and stable linear pressure to the film material through its outer elastic layer. This uniform pressure distribution can force and effectively expel air between the films, significantly improving quality problems such as bulging and wrinkles that easily occur after film winding, and improving product qualification rate and final product quality.

[0014] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0016] Figure 1 This is a schematic diagram of the structure of a winding pressure roller according to the present invention;

[0017] Figure 2 This is a schematic diagram of the force on the surface of a winding pressure roller according to the present invention.

[0018] Explanation of reference numerals in the attached diagram: 1. Elastic layer; 2. Outer roller; 3. Left shaft head of the pressure roller; 31. Bearing position of the left shaft head of the pressure roller; 32. First section on the left; 33. Second section on the left; 34. Left transition section; 4. Right shaft head of the pressure roller; 41. Bearing position of the right shaft head of the pressure roller; 42. First section on the right; 43. Second section on the right; 44. Right transition section. Detailed Implementation

[0019] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0020] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0021] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0022] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0024] Please see Figure 1 The present invention provides a winding pressure roller, comprising an elastic layer 1, an outer roller 2, a left shaft head 3 and a right shaft head 4.

[0025] The elastic layer 1 is entirely covered on the outer peripheral surface of the outer roller 2. In a preferred embodiment, the elastic layer 1 is a rubber layer, which is permanently bonded to the outer roller 2 using existing common processes to ensure the stability and durability of both under high load operation.

[0026] like Figure 1As shown, the left shaft head 3 and the right shaft head 4 of the pressure roller are coaxially assembled inside the outer roller 2. Specifically, the left shaft head 3 includes a left first section 32 and a left second section 33 arranged along its axial direction, and a left shaft head bearing seat 31 located at its outer end. The right shaft head 4 includes a right first section 42 and a right second section 43 arranged along its axial direction, and a right shaft head bearing seat 41 located at its outer end. The left first section 32 is the part of the left shaft head 3 that actually fits into the inner wall of the outer roller 2, and its outer periphery fits into the inner wall of the outer roller 2; similarly, the right first section 42 is the part of the right shaft head 4 that actually fits into the inner wall of the outer roller 2, and its outer periphery fits into the inner wall of the outer roller 2. In a preferred embodiment, the connection between the left first section 32 and the right first section 42 and the inner wall of the outer roller can be achieved by an interference fit, ensuring a stable connection and precise coaxiality between each shaft head and the outer roller. The outer diameter of the left second segment 33 is designed to be smaller than the corresponding inner diameter of the outer roller 2, creating a certain gap between the outer periphery of the left second segment 33 and the inner wall of the outer roller 2. Similarly, the outer diameter of the right second segment 43 is designed to be smaller than the corresponding inner diameter of the outer roller 2, creating a certain gap between the outer periphery of the right second segment 43 and the inner wall of the outer roller 2. A left transition segment 34 is formed between the left first segment 32 and the left second segment 33, and the outer diameter of the left transition segment 34 gradually decreases along the direction from the left first segment 32 to the left second segment 33. A right transition segment 44 is formed between the right first segment 42 and the right second segment 43, and the outer diameter of the right transition segment 44 gradually decreases along the direction from the right first segment 42 to the right second segment 43, to avoid stress concentration.

[0027] The left shaft head bearing position 31 and the right shaft head bearing position 41 of the pressure roller extend outward from both ends of the outer roller 2, respectively. The left shaft head bearing position 31 and the right shaft head bearing position 41 of the pressure roller are used to install bearings and receive external pressure.

[0028] In addition, from the appendix Figure 1 It can also be seen that when the left shaft head 3 and the right shaft head 4 of the pressure roller are assembled inside the outer roller 2, there is a certain gap between their opposing inner end faces (i.e., the end faces closer to the center line of the outer roller). This gap ensures that the two shaft heads will not interfere with each other when subjected to force or thermal expansion and contraction, and may also provide some space for the deflection deformation of the entire roller body.

[0029] This invention solves the problems of pressure transmission and deformation isolation by designing the traditional integral pressure roller shaft as separate left and right shaft heads 3 and 4, which are then built into the outer roller cylinder 2. When external pressure is applied to the bearing positions 31 and 41 of the left and right shaft heads, the pressure is mainly transmitted to the outer roller cylinder 2 through their respective left first section 32 and right first section 42. Because the left and right shaft heads 3 and 4 are separate, this structure avoids the significant overall bending that easily occurs when the traditional integral long shaft is subjected to force at both ends. More importantly, the gaps reserved between the outer periphery of the left second section 33 and the right second section 43 and the inner wall of the outer roller cylinder 2 play a crucial role in deformation isolation. Even if the left shaft head 3 or the right shaft head 4 of the pressure roller itself undergoes slight bending deformation due to force (especially at the bearing positions 31 and 41 of the left and right shaft heads), due to the existence of this gap, these deformations will not be directly transmitted to the outer roller 2, or in other words, the bent part of the shaft head will not "bump" or "press" against the inner wall of the outer roller 2. In this way, the outer roller 2 itself can better maintain its ideal cylindrical shape and straightness, thereby applying more uniform pressure to the outerly wound film through its outer elastic layer 1. The gaps formed between the left second section 33 and the right second section 43 and the inner wall of the outer roller respectively ensure that there is no direct supporting force or bearing force between the outer periphery of the left second section 33 and the right second section 43 and the inner wall of the outer roller, thereby allowing the outer roller 2 to undergo slight elastic deformation as a whole to adapt to the winding state when subjected to pressure transmitted from the left first section 32 and the right first section 42, and isolating the direct influence of possible bending deformation of the shaft head on the geometry of the outer roller 2.

[0030] Combination Figure 2 In actual operation, an external power unit (e.g., a cylinder, not shown in the figure) applies pressure F1 to the bearing positions of the left shaft head bearing 31 and the right shaft head bearing 41 of the pressure roller. Since the left shaft head 3 and the right shaft head 4 of the pressure roller are separate structures and symmetrically assembled inside the outer roller 2, and usually adopt a symmetrical synchronous pressure application structure, the pressure F1 acts on the left and right shaft heads respectively.

[0031] The force F2 (generated by F1) is uniformly transmitted to the outer roller 2 through the mating surfaces of the left first section 32 of the left shaft head 3 and the right first section 42 of the right shaft head 4 with the outer roller 2. Since there are gaps between the left second section 33 and the right second section 43 and the inner wall of the outer roller, the outer roller 2 can undergo slight elastic deformation when it is mainly subjected to pressure from the first section. At the same time, the possible bending deformation of the shaft head will not interfere with the outer roller due to contact with the inner wall, so that the elastic layer 1 on the outer periphery of the outer roller 2 can be pressed more evenly on the winding material.

[0032] When the outer roller 2 is subjected to force as a whole, the force it receives is further transmitted to the elastic layer 1 on its outer peripheral surface, ensuring that the outer roller 2 generates a uniform circumferential compressive load on the elastic layer 1.

[0033] As can be seen, this pressure transmission method of the present invention combines the internally integrated shaft head, segmented fit, deformation isolation provided by key gaps, and the elastic deformation capability of the outer roller itself. This allows a uniformly distributed force field F3 to be formed along the axial cross-section of the elastic layer 1 in the area where the elastic layer 1 contacts the film being wound. This uniform force field F3 can effectively expel air between the films, ensuring tight adhesion between the film layers, thereby preventing problems such as bulging and wrinkling during winding and improving winding quality.

[0034] The above-described embodiments of this utility model, through innovative design of the connection method between the pressure roller shaft head and the outer roller, particularly the structure in which the shaft head is split and internally placed within the outer roller with segmented fit, and the gaps set between the second left segment 33 and the second right segment 43 of the outer roller and the shaft head, ensure that these areas are not directly supported by force and isolate the transmission of shaft head deformation. This effectively solves the problem of uneven axial pressure of the pressure roller in the prior art, and improves the film winding quality. Its structure is relatively simple, easy to manufacture and assemble, and has high practical value.

[0035] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A winding pressure roller, characterized in that, include: The outer roller (2), the elastic layer (1) covering the outer peripheral surface of the outer roller (2), and the left shaft head (3) and the right shaft head (4) of the pressure roller are coaxially assembled inside the outer roller (2); the left shaft head (3) of the pressure roller includes a left first section (32) and a left second section (33) arranged along its axial direction, and the right shaft head (4) of the pressure roller includes a right first section (42) and a right second section (43) arranged along its axial direction; the outer periphery of the left first section (32) and the outer periphery of the right first section (42) are respectively connected to the inner wall of the outer roller (2); the outer periphery of the left second section (33) and the outer periphery of the right second section (43) are respectively connected to the inner wall of the outer roller (2). A gap is formed between the outer periphery of the left second section (33) and the outer periphery of the right second section (43) and the inner wall of the outer roller (2).

2. The winding pressure roller according to claim 1, characterized in that: The outer periphery of the left first segment (32) and the outer periphery of the right first segment (42) are respectively connected to the inner wall of the outer roller (2) by an interference fit.

3. The winding pressure roller according to claim 1 or 2, characterized in that: A left transition segment (34) is formed between the left first segment (32) and the left second segment (33), and the outer diameter of the left transition segment (34) gradually decreases along the direction from the left first segment (32) to the left second segment (33); a right transition segment (44) is formed between the right first segment (42) and the right second segment (43), and the outer diameter of the right transition segment (44) gradually decreases along the direction from the right first segment (42) to the right second segment (43).

4. The winding pressure roller according to claim 1, characterized in that: The free end (31) of the left shaft head (3) of the pressure roller and the free end (41) of the right shaft head (4) of the pressure roller extend outward from both ends of the outer roller (2).

5. The winding pressure roller according to claim 1, characterized in that: When the left shaft head (3) and the right shaft head (4) of the pressure roller are assembled inside the outer roller (2), there is a certain gap between their opposite inner end faces.

6. The winding pressure roller according to claim 1, characterized in that: The elastic layer (1) is a rubber layer, which is fixedly wrapped around the outer peripheral surface of the outer roller (2).

Images