Axial temperature uniformity cantilever high temperature stretching roll

Abstract

The application relates to a cantilever high-temperature stretching roller with uniform axial temperature, and relates to the field of plastic processing equipment, which comprises a roller shaft, a roller body, an inner sealing plate arranged at the inner side end of the roller body and an outer sealing plate arranged at the cantilever end of the roller body, the inner sealing plate is provided with a first vent hole group in a ring array and an equiangular distribution to form an air inlet channel, the outer sealing plate is provided with a second vent hole group in a ring array and a gradually decreasing diameter from the center to the edge to form a backflow channel, a ring-shaped radial reinforcing rib is arranged at the center hole of the outer sealing plate, the opening rates of the inner sealing plate and the outer sealing plate are both 20%-60%, the hole diameter ranges from 5mm to 30mm, and the thickness of the reinforcing rib is 1-1.5 times that of the main body of the outer sealing plate. The application achieves the effect of making the cantilever high-temperature stretching roller have uniform axial temperature.

Description

Technical Field

[0001] This application relates to the field of plastic processing equipment, and in particular to a cantilevered high-temperature stretching roller with uniform axial temperature. Background Technology

[0002] High-temperature stretching heat treatment is a crucial step in the production and post-processing of advanced materials such as polymer films, specialty fibers, and high-performance composites. This process typically takes place in an oven at a specific temperature, where stretching rollers heat, pull, and stretch the material to precisely control its crystallinity, molecular orientation, mechanical properties, and dimensional stability. Among these methods, cantilever stretching rollers, with their fixed-end and free-end structure, offer significant advantages such as convenient material feeding, easy maintenance, and small space occupation, and are widely used in modern industrial production lines.

[0003] Currently, common cantilever rollers typically use a single-end (fixed end) centralized heating method. For example, a rotary joint is set at the fixed end to introduce the heat medium (heat transfer oil, steam or high-temperature hot air). During the process of heat transfer from the fixed end to the free end, there is a significant thermal gradient along the axial direction. The roller itself is a huge heat sink, and its surface continuously dissipates heat to the oven environment through convection and radiation, resulting in the temperature of the free end, which is far from the heating source, being significantly lower than that of the fixed end.

[0004] To address the issue of uneven material heating due to temperature inconsistencies, which negatively impacts product quality, existing solutions include adding an external insulation layer or improving oven temperature gradient compensation. Wrapping the roller surface and ends with a high-performance insulation material prevents heat loss, but this approach only slows down heat loss and doesn't actively replenish heat to the free end. The heat conduction path remains long, and axial thermal resistance persists. For ultra-long and wide rollers, lower free-end temperatures remain inevitable. Adding an oven temperature gradient creates a non-uniform oven environment to compensate for uneven heat dissipation from the stretch roller itself, ultimately providing a uniform temperature field for the material in contact with the roller surface. However, this method involves complex control systems and high costs, requiring multiple temperature control systems and sensors. Design, installation, and debugging are extremely complex, significantly increasing equipment and maintenance costs. Furthermore, these solutions fail to fundamentally solve the problem of uneven heat conduction within the roller and also increase energy consumption. Utility Model Content

[0005] To address the problem of uneven heat conduction within the roller body that existing stretching rollers cannot solve.

[0006] This application provides a cantilevered high-temperature stretching roller with uniform axial temperature, which adopts the following technical solution: A cantilevered high-temperature stretching roller with uniform axial temperature includes a roller shaft, a roller body, an inner sealing plate installed on the inner end of the roller body's oven, and an outer sealing plate installed on the cantilever end of the roller body. The inner sealing plate is provided with a first group of ventilation holes to form an air intake channel for hot air to enter the interior of the roller body; the outer sealing plate is provided with a second group of ventilation holes to form a return channel for hot air to exit the interior of the roller body.

[0007] By adopting the above technical solution, during the high-temperature stretching process of materials such as polymer films and special fibers, hot air can enter the inside of the roller body through the first group of ventilation holes on the inner sealing plate and then be discharged through the second group of ventilation holes on the outer sealing plate. This achieves forced convection of high-temperature air inside the roller, solving the problem of axial temperature difference caused by rapid heat dissipation due to the cantilever shaft extending outside the oven in traditional cantilever rollers. It avoids uneven roller surface temperature and prevents defects such as thickness fluctuations, surface stripes, or even breakage caused by inconsistent thermal shrinkage of materials, significantly improving the axial temperature uniformity of the roller surface. At the same time, compared with traditional rollers that rely solely on external wall conduction for heating, this structure improves thermal energy utilization, accelerates thermal response speed, and reduces energy consumption.

[0008] Preferably, the first ventilation hole group is arranged in a ring array on the inner sealing plate, and the first ventilation hole group adopts an equiangular distribution design.

[0009] By adopting the above technical solution, a thermal circulation channel structure is designed on the end plate of the roller. The first group of ventilation holes is distributed in a ring array at equal angles on the outer end plate, which realizes forced convection of high temperature air inside the roller. This can significantly improve the axial temperature uniformity of the roller surface, avoid defects such as thickness fluctuations, surface stripes or even cracks caused by inconsistent material shrinkage due to heat, improve thermal energy utilization, accelerate thermal response speed and reduce energy consumption.

[0010] Preferably, the opening ratio of the inner sealing plate is 20%-60%, and the hole diameter ranges from 5-30mm.

[0011] By adopting the above technical solution, the opening rate of the inner sealing plate is 20%-60% and the aperture range is 5-30mm. This ensures that hot air can enter the inside of the roller smoothly, while avoiding the impact of excessively large or small openings on the amount of hot air entering and the convection effect, thereby further improving the axial temperature uniformity of the roller surface.

[0012] Preferably, the second group of ventilation holes is arranged in a ring array on the outer sealing plate, and the diameter of the second group of ventilation holes gradually decreases from the center of the outer sealing plate to the edge.

[0013] By adopting the above technical solution, the second ventilation hole group is arranged in a ring array on the outer sealing plate with the diameter gradually decreasing from the center to the edge of the outer sealing plate. This can achieve forced convection of high-temperature air inside the roller, further improve the axial temperature uniformity of the roller surface, reduce defects such as thickness fluctuation, surface stripes or even cracks caused by uneven roller surface temperature, and improve thermal energy utilization.

[0014] Preferably, the central hole diameter of the outer sealing plate accounts for 20%-60% of the diameter of the outer sealing plate, and the diameter range of the second ventilation hole group opened on the outer sealing plate is 5-30mm.

[0015] By adopting the above technical solution, the proportion of the central hole diameter of the outer sealing plate to the diameter of the outer sealing plate is set at 20%-60%, and the hole diameter range of the second ventilation hole group opened on the outer sealing plate is 5-30mm. This can optimize the return flow channel for hot air exhaust in the roller body, promote forced convection of high-temperature air inside the roller, improve the axial temperature uniformity of the roller surface, reduce defects such as thickness fluctuation, surface stripes or even cracks caused by uneven roller surface temperature, and at the same time improve thermal energy utilization and reduce thermal response time and energy consumption.

[0016] Preferably, the outer sealing plate has annular radial reinforcing ribs at the center hole.

[0017] By adopting the above technical solution, annular radial reinforcing ribs are set at the center hole of the outer sealing plate, which can realize forced convection of high-temperature air inside the roller, improve the axial temperature uniformity of the roller surface, and at the same time strengthen the structural strength of the outer sealing plate.

[0018] Preferably, the thickness of the reinforcing rib is 1-1.5 times that of the outer sealing plate body.

[0019] By adopting the above technical solution, it is ensured that the support strength of the outer sealing plate is no less than that of the original un-perforated outer sealing plate when the hole is opened.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a first ventilation hole group and a second ventilation hole group to form a hot air intake and return channel, forced convection of high-temperature air inside the roller is realized, solving the axial temperature difference problem and improving the axial temperature uniformity of the roller surface; 2. Improve the axial temperature uniformity of the roller surface to avoid inconsistent material shrinkage due to heat and prevent defects such as thickness fluctuations, surface streaks, or even cracks. 3. It enables forced convection of high-temperature air inside the roller, improving thermal energy utilization, accelerating thermal response speed, and reducing energy consumption. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the overall structure of the cantilevered high-temperature stretching roller with uniform axial temperature in the embodiments of this application. Figure 2 This is a schematic diagram of the inner sealing plate of the cantilevered high-temperature stretching roller with uniform axial temperature in the embodiments of this application; Figure 3 This is a schematic diagram of the outer sealing plate of the cantilevered high-temperature stretching roller with uniform axial temperature in the embodiments of this application.

[0022] Reference numerals: 1. Roller shaft; 2. Roller body; 3. Inner sealing plate; 31. First ventilation hole group; 4. Outer sealing plate; 41. Ventilation hole group; 5. Reinforcing rib. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail.

[0024] This application discloses a cantilevered high-temperature stretching roller with uniform axial temperature.

[0025] Reference Figure 1 The cantilevered high-temperature stretching roller with uniform axial temperature provided in this application includes a roller shaft 1, a roller body 2, an inner sealing plate 3, and an outer sealing plate 4. The inner sealing plate 3 is installed on the inner end of the roller body 2 in the oven, and the outer sealing plate 4 is installed on the cantilever end of the roller body 2. The inner sealing plate 3 has a first ventilation hole group 31, which forms an air intake channel for hot air to enter the roller body 2. The outer sealing plate 4 has a second ventilation hole group 41, which forms a return channel for hot air to exit the roller body 2. This achieves forced convection of high-temperature air inside the roller, significantly improving the uniformity of axial temperature on the roller surface. By allowing high-temperature hot air to enter the roller through the air intake channel and then exiting through the return channel, a thermal cycle is formed, which can effectively improve the problem of uneven heat conduction inside the roller body.

[0026] Reference Figure 2The first ventilation hole group 31 is arranged in a ring array on the inner sealing plate 3, and is designed with equal angle distribution, so that hot air can enter the interior of the roller body 2 evenly, ensuring that the amount of hot air entering from all directions is relatively balanced. In one feasible way, the first ventilation hole group 31 can also adopt a spiral distribution of ventilation holes, which can also achieve the uniform entry of hot air to a certain extent. The opening ratio of the first ventilation hole group 31 on the inner sealing plate 3 is 20%-60%, and the hole diameter ranges from 5-30mm, to ensure that there is enough flow of hot air into the interior of the roller, while not causing excessive heat loss. If the opening ratio is too small, the amount of hot air entering will be insufficient, which is not conducive to heat circulation; if the opening ratio is too large, it may lead to excessive heat loss. It is easy to see that the opening ratio and hole diameter can be adjusted appropriately according to different heat requirements and roller size. The inner sealing plate 3 is fixed to the inner end of the roller body 2 oven by welding or bolt connection, ensuring the airtightness of the connection and preventing hot air leakage.

[0027] Reference Figure 2 The annular array of equal-angle distribution of the first ventilation hole group 31 allows hot air to enter the roller body 2 evenly from multiple directions, avoiding the situation of too much or too little hot air in some places, thus ensuring the uniformity of hot air distribution inside the roller. The uniform distribution of hot air helps to improve the uniformity of axial temperature on the roller surface and reduce axial temperature difference.

[0028] Reference Figure 3 The second ventilation hole group 41 is arranged in a ring array on the outer sealing plate 4, and the diameter of the second ventilation hole group 41 gradually decreases from the center to the edge of the outer sealing plate 4. This can better guide hot air out of the roller and make the hot air discharge process more orderly. The central hole diameter of the outer sealing plate 4 accounts for 20%-60% of the diameter of the outer sealing plate 4, and the hole diameter range of the second ventilation hole group 41 on the outer sealing plate 4 is 5-30mm. The central hole serves as the main return channel. The proportion of the central hole diameter and the hole diameter of the second ventilation hole group 41 can ensure that hot air is discharged smoothly from the roller, while maintaining the thermal balance inside the roller. The proportion of the central hole diameter and the hole diameter of the second ventilation hole group 41 can be adjusted according to the actual situation. The outer sealing plate 4 has a ring-shaped radial reinforcing rib 5 at the central hole, and the thickness of the reinforcing rib 5 is 1-1.5 times that of the main body of the outer sealing plate 4. The reinforcing rib 5 can enhance the structural strength of the outer sealing plate 4 and prevent the outer sealing plate 4 from deforming under high temperature and pressure. At the same time, the ring-shaped radial shape of the reinforcing rib 5 also minimizes the impact on airflow. It is easy to imagine that other shapes of reinforcing ribs 5 can also be used, such as cross-shaped reinforcing ribs 5, grid-distributed reinforcing ribs 5, etc. The outer sealing plate 4 is fixed to the cantilever end of the roller body 2 by welding or bolting to ensure the stability of the connection.

[0029] Reference Figure 3The annular array design of the second ventilation hole group 41 with a gradually changing diameter, combined with the setting of the reinforcing ribs 5, allows hot air to be discharged from the inside of the roller in an orderly manner. At the same time, the reinforcing ribs 5 enhance the structural strength of the outer sealing plate 4, ensuring the stability of the entire thermal circulation system. The orderly discharge of hot air and the stable structure help to further improve the uniformity of the axial temperature of the roller surface.

[0030] This application does not limit the shape of components such as the first ventilation hole group 31, the second ventilation hole group 41, and the roller body 2.

[0031] The implementation principle of this embodiment is as follows: When the roller is working, the hot air generated by internal heating rises in temperature and forms an upward airflow that flows towards the cantilever end. The central hole, as the main return channel, undertakes the main function of hot air discharge, guiding most of the hot air to be discharged quickly. The second ventilation hole group 41 adopts a ring array with a gradually changing diameter, so that the remaining hot air is evenly dispersed along the roller axis and flows out in an orderly manner according to the gradient, avoiding temperature deviation caused by local airflow concentration. The ring-shaped radial reinforcing ribs 5 on the outer sealing plate 4, on the one hand, strengthen the sealing plate's resistance to deformation through thickening structure, resisting structural damage caused by high temperature and pressure, and on the other hand, their radial distribution minimizes the obstruction of airflow, ensuring the continuity and smoothness of hot air flow. The setting of the central hole diameter ratio and the hole diameter of the second ventilation hole group 41 not only ensures the efficiency of hot air discharge and prevents heat accumulation inside the roller, but also maintains the thermal balance state inside the roller, so that the temperature difference at various positions along the roller surface is effectively reduced, thereby achieving the technical effect of uniform axial temperature of the cantilever high temperature stretching roller.

[0032] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cantilevered high-temperature stretching roller with uniform axial temperature, characterized in that: It includes a roller shaft (1), a roller body (2), an inner sealing plate (3) installed on the inner end of the roller body (2) oven, and an outer sealing plate (4) installed on the cantilever end of the roller body (2). The inner sealing plate (3) is provided with a first ventilation hole group (31) to form an air intake channel for hot air to enter the interior of the roller body (2). The outer sealing plate (4) is provided with a second ventilation hole group (41) to form a return channel for hot air to be discharged from the inside of the roller body (2).

2. The cantilevered high-temperature stretching roller with uniform axial temperature according to claim 1, characterized in that: The first ventilation hole group (31) is arranged in a ring array on the inner sealing plate (3), and the first ventilation hole group (31) adopts an equiangular distribution design.

3. The cantilevered high-temperature stretching roller with uniform axial temperature according to claim 1, characterized in that: The opening ratio of the inner sealing plate (3) is 20%-60%, and the hole diameter range is 5-30mm.

4. The cantilevered high-temperature stretching roller with uniform axial temperature according to claim 1, characterized in that: The second ventilation hole group (41) is arranged in a ring array on the outer sealing plate (4), and the diameter of the second ventilation hole group (41) gradually decreases from the center of the outer sealing plate (4) to the edge.

5. The cantilevered high-temperature stretching roller with uniform axial temperature according to claim 1, characterized in that: The central hole diameter of the outer sealing plate (4) is 20%-60% of the diameter of the outer sealing plate (4), and the diameter range of the second ventilation hole group (41) opened on the outer sealing plate (4) is 5-30mm.

6. The cantilevered high-temperature stretching roller with uniform axial temperature according to claim 1, characterized in that: The outer sealing plate (4) is provided with annular radial reinforcing ribs (5) at the center hole.

7. A cantilevered high-temperature stretching roller with uniform axial temperature according to claim 6, characterized in that: The thickness of the reinforcing rib (5) is 1-1.5 times that of the outer sealing plate (4) body.

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