Heating roller, rolling equipment and drying equipment
By using a reverse-flow heat transfer medium channel structure, the problems of limited heat source location and uneven temperature distribution in traditional heating rollers are solved, achieving uniform heating of the roller surface and stability of the production process, thereby improving product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGYAN NACO INTELLIGENT EQUIP TECH (SHENZHEN) CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-26
AI Technical Summary
Traditional heating rollers suffer from problems such as limited heat source location and uneven temperature distribution during the roller heating process, resulting in large temperature differences on the roller surface, which affects the uniform heating of materials and product quality.
Design a heating roller with a counter-flow heat transfer medium channel structure. The cross-sectional area of the inlet channel is larger than that of the outlet channel. Uniform heating is achieved on the roller surface through the counter-flow heat transfer medium. The flow rate and heat exchange efficiency of the heat transfer medium are improved by utilizing the different areas of the inlet and outlet channels.
It significantly improves the uniformity of roller surface heating, reduces the temperature difference on the roller surface, and enhances the stability of the production process and product quality.
Smart Images
Figure CN224285346U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of heating rollers, and more particularly to a heating roller, a roller pressing device, and a drying device. Background Technology
[0002] In industrial processing of continuous materials such as plastic film, paper, and metal foil, including roll forming and coating drying, roller heating is a crucial step for achieving efficient and stable production. Traditional heated roller technologies mainly employ two methods: electric heating or thermal oil heating. Electric heating achieves temperature rise by embedding electric heating elements within the hollow cavity of the roller, but suffers from limitations in heat source location, uneven temperature distribution, and the heating elements' susceptibility to aging and failure, making it difficult to meet the high-requirement demands of roller surface temperature control and system reliability. In contrast, thermal oil heated rollers, with their large heat capacity and stable heat transfer characteristics, have become the mainstream choice for high-temperature, high-precision processes. This approach typically involves a closed oil passage within the roller body, relying on the circulating flow of high-temperature thermal oil to transfer heat to the roller surface. However, existing oil-heated rollers mostly employ a unidirectional circulation design, where the thermal oil flows in from one end of the roller body, flows axially through to the other end, and then flows back. During this process, the thermal oil releases a large amount of heat energy in the first half of its flow through the roller body, but the oil temperature significantly decreases in the latter half, resulting in a sharp decline in heat exchange capacity. This axial temperature gradient directly leads to obvious regional temperature differences on the roller surface. Especially when producing wide-width or temperature-sensitive materials, the uneven heat distribution between the two ends and the middle section of the roller surface will directly affect the uniformity of material heating, causing quality problems such as poor local curing, thickness fluctuations, or surface defects in the product. Utility Model Content
[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a heating roller, a roller pressing device and a drying device.
[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0005] This application provides:
[0006] A heating roller includes a roller body. An inlet channel and an outlet channel are formed within the roller body along its axial direction. The inlet channel has a first port communicating with the roller body, and the outlet channel has a second port communicating with the outside of the roller body. The first port and the second port are located at the same end of the roller body. The end of the inlet channel opposite to the first port communicates with the end of the outlet channel opposite to the second port. The heat-conducting medium in the inlet channel and the heat-conducting medium in the outlet channel flow in opposite directions. The cross-sectional area of the inlet channel is larger than the area of the outlet channel.
[0007] Furthermore, the roller body has a platform stage, the first port and the second port are located on the end face of the platform stage, a first liquid distribution chamber is provided in the roller body, and the end of the liquid inlet channel opposite to the direction of the first port is connected to the end of the liquid outlet channel opposite to the direction of the second port through the first liquid distribution chamber.
[0008] Furthermore, the liquid inlet channel includes a liquid inlet hole, a second liquid distribution chamber, and a first liquid passage hole. The liquid inlet hole is opened on the stage, the second liquid distribution chamber is opened inside the roller body, the liquid inlet hole is connected to the second liquid distribution chamber, and a plurality of first liquid passage holes are evenly opened on the end face of the second liquid distribution chamber away from the direction of the liquid inlet hole along the axial direction of the roller body. The first liquid passage holes are connected to the first liquid distribution chamber.
[0009] Furthermore, the liquid outlet channel includes a liquid outlet hole, a collecting cavity, and a second liquid passage hole. The liquid outlet hole is opened in the stage, the collecting cavity is opened inside the roller body, the liquid outlet hole communicates with the collecting cavity, and a plurality of second liquid passage holes are evenly opened along the axial direction of the roller body on the inner wall of the collecting cavity opposite to the direction of the liquid outlet hole. The second liquid passage holes communicate with the first liquid distribution cavity, and the second liquid passage holes communicate with the first liquid passage hole through the first liquid distribution cavity.
[0010] Furthermore, the number of the first liquid passages is N, the cross-sectional area of the first liquid passage is S1, the number of the second liquid passages is M, the cross-sectional area of the second liquid passage is S2, and N and M are positive integers, satisfying: S1*N>M*S2.
[0011] Furthermore, the number of the first liquid passages is N, the cross-sectional area of the first liquid passage is S1, the number of the second liquid passages is M, and the cross-sectional area of the second liquid passage is S2, satisfying: S1 = S2, N > M.
[0012] Furthermore, the number of the first liquid passages is N, the cross-sectional area of the first liquid passage is S1, the number of the second liquid passages is M, and the cross-sectional area of the second liquid passage is S2, satisfying: N > M, S1 < S2, and N*S1 > M*S2.
[0013] Furthermore, the distance between the first liquid passage hole and the center of the roller body is R1, and the distance between the liquid outlet hole and the center of the roller body is R2, satisfying: R1=R2.
[0014] This application provides a roller pressing device, which includes at least two heating rollers as described above, with a predetermined spacing between the two heating rollers.
[0015] This application provides a drying apparatus, which includes at least one heating roller as described in any of the claims above, the heating roller having material to be dried on it.
[0016] This application addresses the issue of the first port of the liquid inlet channel and the second port of the liquid outlet channel being located at the same end of the roller body, and makes the cross-sectional area of the liquid inlet channel larger than that of the liquid outlet channel. Combined with the counter-current flow of the heat transfer medium in the liquid inlet channel and the liquid outlet channel, this increases the flow velocity of the heat transfer medium in the liquid outlet channel and improves its heat exchange efficiency. This effectively overcomes the axial temperature difference of the roller body caused by the traditional unidirectional circulation and significantly improves the uniformity of roller surface heating.
[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A schematic diagram of the overall structure of the heating roller of this application is shown;
[0020] Figure 2 A top view of the heating roller structure of this application is shown;
[0021] Figure 3 This application shows Figure 2 Schematic diagram of the sectional view along the central AA direction;
[0022] Figure 4 This application shows Figure 2 Schematic diagram of the BB-direction section;
[0023] Figure 5 This application shows Figure 2 Schematic diagram of cross-section along the CC direction;
[0024] Figure 6 This application shows Figure 2 Schematic diagram of cross-section along the DD direction;
[0025] Figure 7 This application shows Figure 2 Schematic diagram of the EE section;
[0026] Figure 8 This paper shows a schematic diagram of the overall structure of the inlet and outlet channels of this application;
[0027] Figure 9 A cross-sectional schematic diagram of the inlet and outlet channels of this application is shown.
[0028] Explanation of key component symbols:
[0029] 100 - Roller body; 101 - First port; 102 - Second port; 110 - Liquid inlet channel; 111 - Liquid inlet hole; 112 - Second liquid distribution chamber; 113 - First liquid passage hole; 120 - Liquid outlet channel; 121 - Liquid outlet hole; 122 - Collection chamber; 123 - Second liquid passage hole; 130 - First liquid distribution chamber. Detailed Implementation
[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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 application according to the specific circumstances.
[0034] In this application, unless otherwise expressly 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 with the second feature 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.
[0035] This application provides a heating roller, which includes a roller body 100. Specifically, the roller body 100 has an inlet channel 110 and an outlet channel 120 along its axial direction. The inlet channel 110 has a first port 101 communicating with the roller body 100, and the outlet channel 120 has a second port 102 communicating with the outside of the roller body 100. The first port 101 and the second port 102 are located at the same end of the roller body 100. The end of the inlet channel 110 away from the first port 101 is connected to the end of the outlet channel 120 away from the second port 102. The heat-conducting medium in the inlet channel 110 and the heat-conducting medium in the outlet channel 120 flow in opposite directions. The cross-sectional area of the inlet channel 110 is larger than the area of the outlet channel 120.
[0036] Please see Figure 1 , Figure 2 as well as Figure 3 As shown, this application arranges the first inlet port 101 of the liquid inlet channel 110 and the second outlet port 102 of the liquid outlet channel 120 at the same end of the roller body 100, and connects the other ends of the liquid inlet channel 110 and the liquid outlet channel 120, so that the heat-conducting medium from the liquid inlet channel 110 can be returned through the liquid outlet channel 120, and during the return process, the heat-conducting medium will also transfer heat to the roller body 100, thereby improving the heat conversion efficiency.
[0037] Furthermore, since the cross-sectional area of the inlet channel 110 is larger than that of the outlet channel 120, when the liquid flow rate entering the inlet channel 110 remains constant, the flow rate of the heat-conducting medium returning from the outlet channel 120 increases. This improves the heat exchange efficiency of the heat-conducting medium returning from the outlet channel 120, allowing more heat to be transferred to the roller body 100. It should be noted that as the heat-conducting medium in the inlet channel 110 gradually flows towards the inlet of the outlet channel 120, its temperature decreases because it transfers some heat to the roller body 100, resulting in reduced heating capacity. To compensate for this temperature drop during the return flow through the outlet channel 120, the cross-sectional area of the outlet channel 120 is reduced to increase the flow rate of the heat-conducting medium within it. This enhances the heating capacity of the heat-conducting medium as it flows through the outlet channel 120, compensating for the reduced heat exchange efficiency due to temperature drop in the heat transfer mechanism, and achieving uniform heat exchange in all directions of the roller body 100.
[0038] For example, in this embodiment, the heat transfer medium can be selected as heat transfer oil, which will be used as an example in the following description.
[0039] In some specific embodiments, the roller body 100 has a platform stage, the first port 101 and the second port 102 are located on the end face of the platform stage, and a first liquid distribution chamber 130 is provided in the roller body 100. The end of the liquid inlet channel 110 opposite to the direction of the first port 101 is connected to the end of the liquid outlet channel 120 opposite to the direction of the second port 102 through the first liquid distribution chamber 130.
[0040] Please see Figure 3 , Figure 7 , Figure 8 as well as Figure 9 As shown, in order to allow the heat transfer oil from the inlet channel 110 to flow back to the second port 102 through the outlet channel 120, a first liquid distribution chamber 130 is opened inside the end of the roller body 100 opposite to the second port 102. The heat transfer oil from the inlet channel 110 will first flow into the first liquid distribution chamber 130. After the first liquid distribution chamber 130 is filled with heat transfer oil, the heat transfer oil will be diverted to the outlet channel 120. Finally, the heat transfer oil will be discharged through the second port 102, thereby realizing the reverse flow of heat transfer oil.
[0041] In some specific embodiments, the liquid inlet channel 110 includes a liquid inlet hole 111, a second liquid distribution chamber 112, and a first liquid passage hole 113. The liquid inlet hole 111 is opened on the stage, and the second liquid distribution chamber 112 is opened inside the roller body 100. The liquid inlet hole 111 is connected to the second liquid distribution chamber 112. The end face of the second liquid distribution chamber 112 facing away from the direction of the liquid inlet hole 111 is uniformly provided with a plurality of first liquid passage holes 113 along the axial direction of the roller body 100. The first liquid passage holes 113 are connected to the first liquid distribution chamber 113.
[0042] See Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the heat transfer oil first enters the inlet hole 111 through the first port 101, and then enters the second distribution chamber 112. The second distribution chamber 112 divides the heat transfer oil into each of the first liquid passage holes 113. The heat transfer oil flowing into the first liquid passage holes 113 exchanges heat with the roller body 100 through which it flows, thereby raising the temperature at the location of the first liquid passage hole 113 of the roller body 100, thus achieving heating. Finally, the heat transfer oil flows into the first distribution chamber 130, and the first distribution chamber 130 divides the heat transfer oil into each of the second liquid passage holes 123 of the outlet channel 120.
[0043] In some specific embodiments, the liquid outlet channel 120 includes a liquid outlet hole 121, a collecting cavity 122, and a second liquid passage hole 123. The liquid outlet hole 121 is opened on the stage, the collecting cavity 122 is opened inside the roller body 100, the liquid outlet hole 121 is connected to the collecting cavity 122, and a plurality of second liquid passage holes 123 are evenly opened on the inner wall of the collecting cavity 122 away from the direction of the liquid outlet hole 121 along the axial direction of the roller body 100. The second liquid passage holes 123 are connected to the first liquid distribution cavity 130, and the second liquid passage holes 123 are connected to the first liquid passage hole 113 through the first liquid distribution cavity 130.
[0044] Please continue reading. Figure 3 , Figure 4 , Figure 5 as well as Figure 6 As shown, after the heat transfer oil from each of the first liquid passages 113 enters the first liquid distribution chamber 130, it will be diverted to each of the second liquid passages 123. During the flow of the heat transfer oil in the second liquid passages 123, it heats the roller body 100 located at the flow point, causing the temperature of the roller body 100 to rise. The heat transfer oil flowing through the second liquid passages 123 enters the collecting chamber 122 and is collected. Then, the collected heat transfer oil flows through the liquid outlet 121 and is finally discharged from the second port 102, thereby realizing the heating of the roller body 100 by the heat transfer oil.
[0045] Please continue reading. Figure 3 As shown, the inlet hole 111 and the outlet hole 121 are coaxially arranged. Specifically, the inlet hole 111 has a cylindrical cross-section, and the outlet hole 121 is annular.
[0046] In some specific embodiments, in order to make the total area of the first liquid passage 113 greater than the total area of the second liquid passage 123, so that the flow velocity of the heat transfer oil through the second liquid passage 123 is greater than the flow velocity in the first liquid passage 113, the number of the first liquid passage 113 can be limited to N, the cross-sectional area of the first liquid passage 113 is S1, the number of the second liquid passage 123 is M, the cross-sectional area of the second liquid passage 123 is S2, N and M are positive integers, satisfying: S1*N>M*S2.
[0047] It is understandable that S1*N in the above is the sum of the cross-sectional areas of each of the first liquid passages 113, and M*S2 is the sum of the cross-sectional areas of each of the second liquid passages 123, so that the sum of the cross-sectional areas of the first liquid passages 113 is greater than the sum of the cross-sectional areas of the second liquid passages 123, and so that the flow rate of the heat transfer oil in the second liquid passages 123 is greater than the flow rate in the first liquid passages 113.
[0048] Furthermore, the number of first liquid passage holes 113 is N, the cross-sectional area of the first liquid passage hole 113 is S1, the number of second liquid passage holes 123 is M, and the cross-sectional area of the second liquid passage hole 123 is S2, satisfying: S1=S2, N>M.
[0049] It is understandable that since the cross-sectional areas of the first liquid passage 113 and the second liquid passage 123 are equal, making the number of first liquid passage 113 greater than the number of second liquid passage 123 will make the sum of the cross-sectional areas of all first liquid passage 113 greater than the sum of the cross-sectional areas of all second liquid passage 123, so that the flow rate of heat transfer oil in the second liquid passage 123 is greater than the flow rate in the first liquid passage 113.
[0050] Furthermore, the number of first liquid passage holes 113 is N, the cross-sectional area of the first liquid passage hole 113 is S1, the number of second liquid passage holes 123 is M, and the cross-sectional area of the second liquid passage hole 123 is S2, satisfying: N>M, S1<S2, and N*S1>M*S2.
[0051] It is understandable that, in order to ensure the return area of the heat transfer oil passing through the second liquid passage 123, the cross-sectional area of the second liquid passage 123 must be larger than the cross-sectional area of the first liquid passage 113. Furthermore, in order to ensure that the flow velocity of the heat transfer oil passing through the second liquid passage 123 is greater than the flow velocity passing through the first liquid passage 113, that is, to ensure that the total cross-sectional area of the multiple first liquid passages 113 is greater than the total cross-sectional area of the multiple second liquid passages 123, the number of first liquid passages 113 needs to be greater than the number of second liquid passages 123.
[0052] In this embodiment, please refer to Figure 4 , Figure 5 , Figure 6 as well as Figure 7As shown, the first liquid passage 113 and the second liquid passage 123 have the same cross-sectional area. The number of first liquid passages 113 is greater than the number of second liquid passages 123. In the circumferential direction, the first liquid passages 113 are arranged between two adjacent second liquid passages 123. It should be noted that the area of the first liquid passages 113 and the second liquid passages 123, as well as the number of the first liquid passages 113 and the second liquid passages 123, are not specifically limited here. The appropriate number and area can be selected according to actual needs.
[0053] Furthermore, in order to accurately control the temperature of the roller 100, at least one temperature sensor can be installed on the roller 100 to monitor the temperature change of the roller 100 in real time. The temperature change can be used to change parameters such as the temperature or flow rate of the heat transfer oil entering the roller 100. The specific installation location of the temperature sensor is not limited here.
[0054] In this embodiment, the distance between the first liquid passage hole 113 and the axis of the roller body 100 is R1, and the distance between the liquid outlet hole 121 and the axis of the roller body 100 is R2, satisfying: R1=R2.
[0055] In this embodiment, since the roller body 100 has cavities such as the second liquid distribution cavity 112, the collection cavity 122, the first liquid passage hole 113, the second liquid passage hole 123, and the first liquid distribution cavity 130, it can be processed in a separate manner during processing. After each cavity is processed, it is fixedly connected. In practice, other processing methods can be used, and no specific method is limited here.
[0056] This application provides a roller pressing device, which includes at least two heating rollers, with a preset distance between the two heating rollers. The material is heated and extruded by the interaction of the material between the two heating rollers.
[0057] This application embodiment also provides a drying device, which includes at least one heating roller as described above. The heating roller is provided with material to be dried, that is, the material is wound on the heating roller, and the heating roller transfers heat to the rolled material, thereby heating and drying the rolled material that has passed through the heating roller.
[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0059] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A heating roller, characterized in that, include: A roller body (100) has an inlet channel (110) and an outlet channel (120) opened in its axial direction. The inlet channel (110) has a first port (101) communicating with the roller body (100), and the outlet channel (120) has a second port (102) communicating with the outside of the roller body (100). The first port (101) and the second port (102) are located at the same end of the roller body (100). The end of the inlet channel (110) away from the first port (101) is connected to the end of the outlet channel (120) away from the second port (102). The heat-conducting medium in the inlet channel (110) and the heat-conducting medium in the outlet channel (120) flow in opposite directions. The cross-sectional area of the inlet channel (110) is larger than the area of the outlet channel (120).
2. The heating roller according to claim 1, characterized in that, The roller body (100) has a platform stage, and the first port (101) and the second port (102) are located on the end face of the platform stage. A first liquid distribution chamber (130) is provided in the roller body (100). The end of the liquid inlet channel (110) facing away from the first port (101) is connected to the end of the liquid outlet channel (120) facing away from the second port (102) through the first liquid distribution chamber (130).
3. The heating roller according to claim 2, characterized in that, The liquid inlet channel (110) includes a liquid inlet hole (111), a second liquid distribution chamber (112), and a first liquid passage hole (113). The liquid inlet hole (111) is opened on the stage, and the second liquid distribution chamber (112) is opened inside the roller body (100). The liquid inlet hole (111) is connected to the second liquid distribution chamber (112). The end face of the second liquid distribution chamber (112) facing away from the liquid inlet hole (111) is uniformly provided with a plurality of first liquid passage holes (113) along the axial direction of the roller body (100). The first liquid passage holes (113) are connected to the first liquid distribution chamber (130).
4. The heating roller according to claim 3, characterized in that, The liquid outlet channel (120) includes a liquid outlet hole (121), a collecting cavity (122), and a second liquid passage hole (123). The liquid outlet hole (121) is opened on the stage, and the collecting cavity (122) is opened inside the roller body (100). The liquid outlet hole (121) is connected to the collecting cavity (122). A plurality of second liquid passage holes (123) are evenly opened on the inner wall of the collecting cavity (122) away from the direction of the liquid outlet hole (121) along the axial direction of the roller body (100). The second liquid passage holes (123) are connected to the first liquid distribution cavity (130), and the second liquid passage holes (123) are connected to the first liquid passage hole (113) through the first liquid distribution cavity (130).
5. The heating roller according to claim 4, characterized in that, The number of the first liquid passage (113) is N, the cross-sectional area of the first liquid passage (113) is S1, the number of the second liquid passage (123) is M, the cross-sectional area of the second liquid passage (123) is S2, N and M are positive integers, satisfying: S1*N>M*S2.
6. The heating roller according to claim 4, characterized in that, The number of the first liquid passage (113) is N, the cross-sectional area of the first liquid passage (113) is S1, the number of the second liquid passage (123) is M, and the cross-sectional area of the second liquid passage (123) is S2, satisfying: S1=S2, N>M.
7. The heating roller according to claim 4, characterized in that, The number of the first liquid passage (113) is N, the cross-sectional area of the first liquid passage (113) is S1, the number of the second liquid passage (123) is M, and the cross-sectional area of the second liquid passage (123) is S2, satisfying: N>M, S1<S2, and N*S1>M*S2.
8. The heating roller according to claim 4, characterized in that, The distance between the first liquid passage (113) and the axis of the roller body (100) is R1, and the distance between the liquid outlet (121) and the axis of the roller body (100) is R2, satisfying: R1=R2.
9. A roller pressing device, characterized in that, include: At least two heating rollers according to any one of claims 1 to 8, wherein a predetermined spacing is formed between the two heating rollers.
10. A drying device, characterized in that, include: At least one heating roller according to any one of claims 1 to 8, wherein the heating roller has material to be dried.