Heating roller

Abstract

The invention discloses a heating roller belonging to the technical field of rollers, which comprises a heating roller, and is characterized in that the heating roller is provided with at least one group of heating holes and at least one group of heat conduction holes along the axial direction, heating pipes are arranged in the heating holes in a penetrating manner, heat conduction media are arranged in the heat conduction holes, the heat conduction media are sealed in the heat conduction holes, and the heat conduction holes are communicated with the heating pipes. The heating pipes operate to heat the heating holes in the circumferential direction and conduct heat to one sides of the heat conduction holes, the heat conduction media exchange heat with the high-temperature areas and the low-temperature areas in the axial direction and the circumferential direction of the heat conduction holes, and uniform heating in the axial direction and the circumferential direction of the heating rollers is achieved. The heating pipe heats the heating hole in the axial direction and the circumferential direction, the heat-conducting medium absorbs heat of the high-temperature area in the circumferential direction of the heat-conducting hole and exchanges heat with the low-temperature area in the circumferential direction and the axial direction of the heat-conducting hole, uniform heat is conducted on the heating roller in the circumferential direction and the axial direction, and the axial temperature and the circumferential temperature of the heating roller are more uniform.

Description

Technical Field

[0001] This invention relates to the field of roller technology, and more specifically to a heating roller. Background Technology

[0002] Roller heating equipment is a commonly used industrial heating device. Heating rollers can heat materials, improve their properties, and prevent them from sticking or solidifying. Its basic principle is to heat the material passing through the rollers using heating rollers mounted on them. Common types of heating rollers include electric heating rollers, gas heating rollers, and liquid heating rollers.

[0003] Chinese invention patent publication number "CN119756017A" discloses a heating roller, including a liquid distribution assembly. One end of the liquid distribution assembly is rotatably connected to a rotary joint, and the end of the liquid distribution assembly away from the rotary joint is connected to the heating roller. The heating roller is provided with multiple sets of U-shaped loops, each set of U-shaped loops is provided with an inlet and an outlet. The heat transfer medium flows from the inlet to the outlet and undergoes heat exchange, so that the U-shaped loop forms a high-temperature section and a low-temperature section. The inlet and outlet are both connected to the liquid distribution assembly and are located on the side of the U-shaped loop closer to the liquid distribution assembly. The high-temperature section and the low-temperature section are arranged alternately on the surface of the heating roller to make the surface temperature of the heating roller uniform.

[0004] However, the liquid separation assembly heats the roller through a U-shaped circuit. During the flow of the high-temperature liquid, the liquid will first exchange heat with the inlet, and the heat will gradually be transferred from the inlet to the outlet during the liquid flow. That is, the temperature of the inlet and outlet of the roller is always significantly different during the heating process. The roller is heated unevenly, and liquid at the same temperature needs to be continuously introduced to keep the outer surface temperature of the roller stable. The surface temperature of the roller fluctuates greatly. Summary of the Invention

[0005] The purpose of this invention is to provide a heating roller with uniform circumferential and axial temperature changes that is suitable for a wide temperature range.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a heating roller, comprising a heating roller, characterized in that: the heating roller has at least one set of heating holes and at least one set of heat conduction holes along the axial direction, a heating tube is inserted into the heating hole, a heat conduction medium is provided in the heat conduction hole, the heat conduction medium is sealed in the heat conduction hole, the heating tube operates in the heating hole to heat the roller body axially and circumferentially, and the heat conduction medium exchanges heat with the higher temperature region and the lower temperature region of the heat conduction hole in the axial and circumferential directions, thereby achieving uniform heating of the heating roller in both the axial and circumferential directions.

[0007] By adopting the above technical solution: the heat-conducting medium is liquid or solid at room temperature. Heating holes are circumferentially distributed on the heating roller. When the heating tube is activated, one heating tube heats the heating roller body axially and circumferentially within one heating hole. A group of heating tubes heats the entire heating roller body axially and circumferentially. During the heating process, heat is conducted from the center of the heating hole to the surrounding area. The temperature between two adjacent heating holes is lower than the outer periphery temperature of the heating roller body. The heat-conducting medium within the heating hole absorbs heat from the higher-temperature area around the heating hole, reducing the heating rate on that side and conducting heat to the lower-temperature area, maintaining a uniform temperature on the outer periphery of the heating roller body. Simultaneously, the heat-conducting medium vaporizes during the heating process. Because the vaporized area within the heating hole is larger than the non-vaporized area, and the area with a stronger degree of vaporization is larger than the area without vaporization, the heat-conducting medium is more efficient in heating the roller body. In areas with lower vaporization, the pressure is higher, meaning there are pressure fluctuations in the axial and circumferential directions within the heat-conducting holes. The vaporized heat-conducting medium flows rapidly along the axial direction of the heat-conducting holes under pressure, thereby exchanging heat between the higher and lower temperature areas. This achieves rapid and uniform heating of the heating roller body in both the axial and axial directions, improving the speed and consistency of temperature changes on the outer periphery during the heating process. Furthermore, the vaporized heat-conducting medium pressurizes the sealed heat-conducting holes, increasing the boiling point of the heat-conducting medium. Due to pressure changes within the heat-conducting holes, the partially vaporized heat-conducting medium undergoes a two-phase circulation change of vaporization and liquefaction within the holes. In other words, during the heating process, the heat-conducting holes always maintain both liquid and gaseous heat-conducting medium. In addition, both the heating holes and the heat-conducting holes are distributed on the heating roller body, allowing the heating tubes to quickly transfer heat to the heating roller body, reducing heat loss and improving heat transfer efficiency.

[0008] The heating roller described above can be further configured such that heating holes and heat-conducting holes are circumferentially spaced and alternately arranged, the heat-conducting holes are open at one end and closed at the other end, a first sealing block is provided at the open end of the heat-conducting hole, the first sealing block is welded to seal the heat-conducting port to form a medium cavity, and the heat-conducting medium is sealed in the medium cavity.

[0009] By adopting the above technical solution—that is, alternating arrangement of heating holes and heat conduction holes, i.e., any heating hole is located between two adjacent heat conduction holes, and any heat conduction hole is located between two adjacent heating holes—the heat conduction medium in the heat conduction holes can simultaneously absorb the heat conducted by the heating holes on both sides, causing the heat conduction medium to heat up and vaporize rapidly, improving the axial and circumferential heating efficiency of the heating roller. At the same time, the heat conduction medium is poured into the medium cavity, and a vacuum is drawn into the medium cavity during sealing. Under low pressure, the boiling point of the heat conduction medium is lower, allowing the heat conduction medium to boil and vaporize at a lower temperature. Furthermore, when the heat conduction medium vaporizes, the vaporized heat conduction medium pressurizes the medium cavity, thereby increasing the boiling point of the heat conduction medium and causing the vaporized heat conduction medium to re-liquefy. This achieves the simultaneous vaporization and liquefaction process of the heat conduction medium in the medium cavity, enabling the heat conduction medium to transfer heat to the heating roller more quickly.

[0010] The aforementioned heating roller can be further configured such that: a heat-conducting hole extends through the heating roller along the axial direction, and a first sealing block and a second sealing block are respectively provided at the openings at both ends of the heat-conducting hole. The first sealing block and the second sealing block seal the two ends of the heat-conducting hole to form a medium cavity, and the heat-conducting medium is poured into the medium cavity. The first sealing block and the second sealing block are fixedly connected to the heating roller.

[0011] By adopting the above technical solution, the heat-conducting hole is open at both ends, which allows the heating roller to directly open the heat-conducting hole during the opening process, reducing the processing difficulty of the heating hole and the heat-conducting hole. At the same time, when pouring the heat-conducting medium, the first sealing block or the second sealing block is first inserted into one end opening of the heat-conducting hole and welded and fixed. Then the heat-conducting medium is poured into the heat-conducting hole. Subsequently, the second sealing block or the first sealing block is inserted into the other end opening of the heat-conducting hole and welded. This allows for rapid pouring of the heat-conducting medium.

[0012] The heating roller described above can be further configured such that heating holes and heat-conducting holes are distributed on different circumferences of the heating roller, the heat-conducting holes are open at one end and closed at the other end, a first sealing block is provided at the open end of the heat-conducting hole, the first sealing block is welded to seal the heat-conducting port to form a medium cavity, and the heat-conducting medium is sealed in the medium cavity.

[0013] By adopting the above technical solution: the heating roller uses the heat from its outer circumference to heat the material. The heating holes are distributed circumferentially on the inner ring of the heating roller, while the heat conduction holes are distributed circumferentially on the outer ring of the heating roller. When the heating roller is started, it transfers heat to the heat conduction holes on the outer ring. The heat conduction medium absorbs the heat from the side of the heat conduction hole near the heating hole and conducts the heat to the lower temperature area inside the heat conduction hole. At the same time, as the temperature inside the medium cavity rises, the heat conduction medium vaporizes. The vaporized heat conduction medium exchanges heat with the lower temperature areas circumferentially and axially of the heat conduction holes, realizing the rapid transfer of heat along the axial and circumferential directions of the heating roller, and achieving uniform heating of the outer circumferential surface of the heating roller.

[0014] The aforementioned heating roller can be further configured such that: a shaft hole is provided in the middle of the heating roller, a connecting shaft is provided in the shaft hole, and a roller shaft head is provided at least one end of the heating roller. The roller shaft head is linked with the output end of the drive motor to drive the heating roller to rotate circumferentially around the connecting shaft.

[0015] By adopting the above technical solution: the roller shaft head is welded or bolted to the heating roller, the connecting shaft is welded to the roller shaft head, the heating tubes extend out of the roller shaft head at both ends, and the end face of the roller shaft head is further reinforced to improve the load capacity of the medium cavity. At the same time, by setting a drive gear shaft or a rotating bearing on the roller shaft head, the roller shaft head is linked with the drive motor through the drive gear shaft, or rotates with the equipment through the rotating bearing, so that the heating roller can rotate stably around the central axis of the connecting shaft.

[0016] The aforementioned heating roller can be further configured such that: the heating tube is an electric heating tube, and a conductive slip ring is provided at the end of the connecting shaft, with the heating tube and the conductive slip ring being electrically connected.

[0017] By adopting the above technical solution, the heating tube uses an electric heating tube and transmits power through a conductive slip ring, enabling the rotating heating roller to continuously receive stable electrical energy. This ensures the continuous and stable operation of the heating tube during the rotation of the roller, thereby ensuring the uniformity and controllability of the surface temperature of the heating roller. The conductive slip ring avoids the problem of traditional wire entanglement, improving the safety and reliability of the heating roller operation. At the same time, it simplifies the overall structure, making maintenance and installation easier, and further enhancing the practicality and working efficiency of the heating roller.

[0018] The beneficial effects of this invention are as follows: First, heating holes and heat conduction holes are opened axially on the heating roller, and the heating tube is inserted into the heating hole. The heat conduction medium is sealed in the heat conduction hole. Compared with the traditional method of heating roller through a U-shaped pipe to introduce high-temperature heat conduction medium, the heat conduction medium is sealed in the medium cavity of the heat conduction hole. The heating tube directly heats the roller body and directly conducts heat to the roller body. This can reduce heat loss during the heating process and improve the heating efficiency of the heating tube to the heating roller. At the same time, during the heating process, the heat conduction medium distributed circumferentially in the heat conduction holes on the roller body can exchange heat between the high temperature area and the low temperature area of ​​the roller body in the axial and circumferential directions. This achieves heat exchange between the high temperature area and the low temperature area of ​​the roller body and keeps the axial and circumferential temperature of the heating roller body uniform.

[0019] Secondly, the heat-conducting medium is sealed inside the heat-conducting hole. During the heating process, the heat-conducting medium inside the heat-conducting hole will vaporize. Since the vaporized heat-conducting medium has a higher fluidity than the heat-conducting medium under normal conditions, and the pressure in different parts of the heat-conducting hole fluctuates, the vaporized heat-conducting medium can flow rapidly along the axial direction of the heat-conducting hole under the pressure inside the heat-conducting hole. This further facilitates rapid heat exchange between the higher and lower temperature areas, improves the heat exchange efficiency of the heat-conducting medium, and achieves rapid and uniform heating of the heating roller body in both the circumferential and axial directions. The axial and circumferential temperatures of the heating roller body are more uniform.

[0020] Third, before sealing, some of the internal gas is extracted from the heat-conducting holes, resulting in a lower gas pressure inside the medium cavity. The boiling point of the heat-conducting medium is lower under low pressure, allowing it to vaporize at a lower temperature. At the same time, the vaporized heat-conducting medium pressurizes the medium cavity, raising its boiling point. The partially vaporized heat-conducting medium re-liquefies under pressure, achieving a two-phase change of vaporization and liquefaction within the medium cavity. In other words, the medium cavity always contains heat-conducting medium in both states during the heating process, enabling the heating roller to achieve rapid and uniform heating at both lower and higher temperatures, thus improving the applicability of the heating roller.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the heating roller according to Embodiment 1 of the present invention; Figure 3 This is a cross-sectional schematic diagram of the heating roller according to Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the heating roller according to Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the heating roller according to Embodiment 3 of the present invention; Figure 6 This is a cross-sectional schematic diagram of the heating roller according to Embodiment 3 of the present invention; Figure 7 This is a cross-sectional schematic diagram of the heating roller according to Embodiment 4 of the present invention; Figure 8 This is a schematic diagram of the heating roller according to Embodiment 5 of the present invention; Figure 9 This is a cross-sectional schematic diagram of the heating roller according to Embodiment 5 of the present invention; Label annotations: heating roller 1, shaft hole 11, heating hole 12, heat conduction hole 13, first sealing block 131, second sealing block 132, medium cavity 133, connecting shaft 2, roller shaft head 21, heating tube 3, heat conduction medium 4, conductive slip ring 5. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: A heating roller, such as Figures 1 to 3 As shown, it includes a heating roller 1, with a shaft hole 11 in the middle of the heating roller 1. A connecting shaft 2 is provided in the shaft hole 11. The heating roller 1 is linked with the connecting shaft 2. The two ends of the connecting shaft 2 are protruding from the heating roller 1. Roller shaft heads 21 are provided at both ends of the heating roller. The heating roller 1 has a set of heating holes 12 and a set of heat conduction holes 13 along the axial direction. The heating holes 12 and heat conduction holes 13 are circumferentially spaced and alternately arranged. A heating tube 3 is inserted in the heating hole 12. A heat conduction medium 4 is filled in the heat conduction hole 13. The heat conduction medium 4 is sealed in the heat conduction hole 13. The heating tube 3 heats the heating roller 1 and conducts the heat to the heat conduction medium 4 to heat the heating roller 1 circumferentially.

[0025] The heat conduction hole 13 is open at one end and closed at the other end. A first sealing block 131 is provided at the opening of the heat conduction hole 13. The first sealing block 131 closes the heat conduction hole 13 to form a medium cavity 133. The heat conduction medium 4 is poured into the medium cavity 133. The first sealing block 131 closes the opening of the heat conduction hole and is fixedly connected to the heating roller 1.

[0026] Heating tube 3 is an electric heating tube, and a conductive slip ring 5 is provided at the end of the connecting shaft 2. Heating tube 3 is electrically connected to conductive slip ring 5.

[0027] The working principle of this embodiment is as follows: A shaft hole 11 is opened in the middle of the heating roller 1 along the axial direction, and a set of heating holes 12 and a set of heat conduction holes 13 are alternately opened along the axial direction around the shaft hole 11. The heating holes 12 pass through the heating roller 1 and are open at both ends. The heat conduction holes 13 are open at one end and closed at the other end. Then, the heating tube 3 is inserted into the heating hole 12, and the heat conduction medium 4 is poured into the heat conduction hole 13.

[0028] After the filling is completed, the first sealing block 131 is inserted into the opening of the heat conduction hole 13 and the heat conduction hole 13 is sealed by welding, and the heat conduction medium 4 is sealed in the medium cavity 133.

[0029] Then, the connecting shaft 2 is inserted into the shaft hole 11, and the roller shaft head 21 is welded and fixed to the end of the heating roller. The conductive slip ring 5 is inserted on the connecting shaft 2.

[0030] Finally, connect the rotor end electrical connection wire of the conductive slip ring 5 to the heating tube 3, and connect the stator end electrical connection wire of the conductive slip ring 5 to the power supply to power the heating tube 3.

[0031] When heating the heating roller, the heating tube 3 operates in the heating hole 12 to heat the roller body of the heating roller 1 in the axial and circumferential directions. The heat conduction medium 4 in the heat conduction hole 13 absorbs the heat from the higher temperature areas in the axial and circumferential directions of the heating roller 1 and conducts the heat to the lower temperature areas in the axial and circumferential directions of the heating roller 1, thereby exchanging heat between the higher and lower temperature areas in the axial and circumferential directions of the heating roller 1 and achieving uniform heating of the heating roller 1 in both the axial and circumferential directions.

[0032] Meanwhile, the heat-conducting medium 4 in the medium cavity 133 partially vaporizes during the heating process. Under the pressure in the medium cavity 133, the vaporized heat-conducting medium 4 flows axially along the heat-conducting hole 13, rapidly exchanging heat between the high-temperature and low-temperature areas in the axial and circumferential directions of the heating roller 1, thereby rapidly homogenizing the heat-conducting hole 13 in the axial and circumferential directions and maintaining the uniformity of the outer circumferential surface temperature of the heating roller 1 during the heating process.

[0033] Furthermore, the vaporized heat transfer medium 4 pressurizes the medium cavity 133, increasing the boiling point of the heat transfer medium 4. The partially vaporized heat transfer medium 4 re-liquefies under pressure. Due to the partial liquefaction of the heat transfer medium 4, the pressure inside the medium cavity 133 decreases, and the partial vaporization of the heat transfer medium 4 fills the medium cavity 133. That is, the heat transfer medium 4 circulates in the medium cavity 133, undergoing a two-phase change of vaporization and liquefaction.

[0034] Example 2: The difference between Example 2 and Example 1 is that, as Figure 4 As shown, the heat conduction hole 13 extends axially through the heating roller 1 and is open at both ends. A first sealing block 131 and a second sealing block 132 are respectively provided at the two ends of the heat conduction hole 13. The first sealing block 131 and the second sealing block 132 seal the two ends of the heat conduction hole 13 to form a medium cavity 133. The heat conduction medium 4 is poured into the medium cavity 133. The first sealing block 131 and the second sealing block 132 are fixedly connected to the heating roller 1.

[0035] The working principle of this embodiment is as follows: A shaft hole 11 is opened in the middle of the heating roller 1 along the axial direction, and a set of heating holes 12 and a set of heat-conducting holes 13 are alternately opened in the axial direction around the shaft hole 11. The heating holes 12 pass through the heating roller 1 and are open at both ends. The heat-conducting holes 13 pass through the heating roller 1 and are open at both ends. Then, the heating tube 3 is inserted into the heating hole 12, and the first sealing block 131 is inserted into one end opening of the heat-conducting hole 13 and welded to seal the end of the heat-conducting hole 13. Then, the heat-conducting medium 4 is poured into the heat-conducting hole 13.

[0036] After the filling is completed, the second sealing block 132 is inserted into the other end opening of the heat conduction hole 13 to seal the heat conduction hole 13, and the heat conduction medium 4 is sealed in the medium cavity 133.

[0037] Then, the connecting shaft 2 is inserted into the shaft hole 11, and the roller shaft head 21 is welded and fixed to the end of the heating roller. The conductive slip ring 5 is inserted on the connecting shaft 2.

[0038] Finally, connect the rotor end electrical connection wire of the conductive slip ring 5 to the heating tube 3, and connect the stator end electrical connection wire of the conductive slip ring 5 to the power supply to power the heating tube 3.

[0039] When heating the heating roller, the heating tube 3 operates in the heating hole 12 to heat the roller body of the heating roller 1 in the axial and circumferential directions. The heat conduction medium 4 in the heat conduction hole 13 absorbs the heat from the higher temperature areas in the axial and circumferential directions of the heating roller 1 and conducts the heat to the lower temperature areas in the axial and circumferential directions of the heating roller 1, thereby exchanging heat between the higher and lower temperature areas in the axial and circumferential directions of the heating roller 1 and achieving uniform heating of the heating roller 1 in both the axial and circumferential directions.

[0040] Meanwhile, the heat-conducting medium 4 in the medium cavity 133 partially vaporizes during the heating process. Under the pressure in the medium cavity 133, the vaporized heat-conducting medium 4 flows axially along the heat-conducting hole 13, rapidly exchanging heat between the high-temperature and low-temperature areas in the axial and circumferential directions of the heating roller 1, thereby rapidly homogenizing the heat-conducting hole 13 in the axial and circumferential directions and maintaining the uniformity of the outer circumferential surface temperature of the heating roller 1 during the heating process.

[0041] Furthermore, the vaporized heat transfer medium 4 pressurizes the medium cavity 133, increasing the boiling point of the heat transfer medium 4. The partially vaporized heat transfer medium 4 re-liquefies under pressure. Due to the partial liquefaction of the heat transfer medium 4, the pressure inside the medium cavity 133 decreases, and the partial vaporization of the heat transfer medium 4 fills the medium cavity 133. That is, the heat transfer medium 4 circulates in the medium cavity 133, undergoing a two-phase change of vaporization and liquefaction.

[0042] Example 3: The difference between Example 3 and Example 1 is that, as Figure 5 , Figure 6 As shown, both the heating holes 12 and the heat conduction holes 13 include two sets. The first set of heating holes 12 and the first set of heat conduction holes 13 are circumferentially spaced and alternately arranged. The second set of heating holes 12 and the second set of heat conduction holes 13 are circumferentially spaced and alternately arranged. The first set of heating holes 12 and the second set of heat conduction holes 13 are radially aligned. The first set of heat conduction holes 13 and the second set of heating holes 12 are radially aligned. The heating tube 3 and the heat conduction medium 4 are alternately and staggeredly arranged in the two sets of heating holes 12 and the two sets of heat conduction holes 13 respectively.

[0043] The working principle of this embodiment is as follows: A shaft hole 11 is opened in the middle of the heating roller 1 along the axial direction, and a first set of heating holes 12 and a first set of heat conduction holes 13 are alternately opened in the circumference of the shaft hole 11. A second set of heating holes 12 and a second set of heat conduction holes 13 are alternately opened in the circumference between the first set of heating holes 12 and the first set of heat conduction holes 13 and the outer circumference of the heating roller 1. The two sets of heating holes 12 pass through both ends of the heating roller 1 and are open. The two sets of heat conduction holes 13 are open at one end and closed at the other end. Then, the two sets of heating tubes 3 are respectively inserted into the two sets of heating holes 12, and heat conduction medium 4 is poured into the two sets of heat conduction holes 13.

[0044] After the filling is completed, the first sealing block 131 is inserted into the end opening of the heat conduction hole 13 and the heat conduction hole 13 is sealed by welding, and the heat conduction medium 4 is sealed in the medium cavity 133.

[0045] Then, the connecting shaft 2 is inserted into the shaft hole 11, and the roller shaft head 21 is welded and fixed to the end of the heating roller. The conductive slip ring 5 is inserted on the connecting shaft 2.

[0046] Finally, connect the rotor end electrical connection wire of the conductive slip ring 5 to the two sets of heating tubes 3, and connect the stator end electrical connection wire of the conductive slip ring 5 to the power supply to power the two sets of heating tubes 3.

[0047] When heating the heating roller, two sets of heating tubes 3 operate in two sets of heating holes 12 to heat the roller body of the heating roller 1 in the axial and circumferential directions. The heat conduction medium 4 in the two sets of heat conduction holes 13 absorbs the heat from the higher temperature areas in the axial and circumferential directions of the heating roller 1 and conducts the heat to the lower temperature areas in the axial and circumferential directions of the heating roller 1, thereby exchanging heat between the higher and lower temperature areas in the axial and circumferential directions of the heating roller 1 and achieving uniform heating of the heating roller 1 in both the axial and circumferential directions.

[0048] Meanwhile, the heat-conducting medium 4 in the medium cavity 133 partially vaporizes during the heating process. Under the pressure in the medium cavity 133, the vaporized heat-conducting medium 4 flows axially along the heat-conducting hole 13, rapidly exchanging heat between the high-temperature and low-temperature areas in the axial and circumferential directions of the heating roller 1, thereby rapidly homogenizing the heat-conducting hole 13 in the axial and circumferential directions and maintaining the uniformity of the outer circumferential surface temperature of the heating roller 1 during the heating process.

[0049] Furthermore, the vaporized heat transfer medium 4 pressurizes the medium cavity 133, increasing the boiling point of the heat transfer medium 4. The partially vaporized heat transfer medium 4 re-liquefies under pressure. Due to the partial liquefaction of the heat transfer medium 4, the pressure inside the medium cavity 133 decreases, and the partial vaporization of the heat transfer medium 4 fills the medium cavity 133. That is, the heat transfer medium 4 circulates in the medium cavity 133, undergoing a two-phase change of vaporization and liquefaction.

[0050] Example 4: The difference between Example 4 and Example 3 is that, as Figure 7 As shown, the heat conduction hole 13 extends axially through the heating roller 1 and is open at both ends. A first sealing block 131 and a second sealing block 132 are respectively provided at the two ends of the heat conduction hole 13. The first sealing block 131 and the second sealing block 132 seal the two ends of the heat conduction hole 13 to form a medium cavity 133. The heat conduction medium 4 is poured into the medium cavity 133. The first sealing block 131 and the second sealing block 132 are fixedly connected to the heating roller 1.

[0051] The working principle of this embodiment is as follows: A shaft hole 11 is opened axially in the middle of the heating roller 1, and a first set of heating holes 12 and a first set of heat-conducting holes 13 are alternately opened circumferentially in the shaft hole 11. A second set of heating holes 12 and a second set of heat-conducting holes 13 are alternately opened circumferentially between the first set of heating holes 12 and the first set of heat-conducting holes 13 and the outer periphery of the heating roller 1. The heating holes 12 penetrate the heating roller 1 and are open at both ends, and the heat-conducting holes 13 penetrate the heating roller 1 and are open at both ends. Then, two sets of heating tubes 3 are inserted into the two sets of heating holes 12, and a first sealing block 131 is inserted into one end opening of the two sets of heat-conducting holes 13 and welded to seal the end of the heat-conducting holes 13. Then, heat-conducting medium 4 is poured into the two sets of heat-conducting holes 13.

[0052] After the filling is completed, the second sealing block 132 is inserted into the other end opening of the two sets of heat conduction holes 13 to seal the heat conduction holes 13, and the heat conduction medium 4 is sealed in the medium cavity 133.

[0053] Then, the connecting shaft 2 is inserted into the shaft hole 11, and the roller shaft head 21 is welded and fixed to the end of the heating roller. The conductive slip ring 5 is inserted on the connecting shaft 2.

[0054] Finally, connect the rotor end electrical connection wire of the conductive slip ring 5 to the two sets of heating tubes 3, and connect the stator end electrical connection wire of the conductive slip ring 5 to the power supply to power the two sets of heating tubes 3.

[0055] When heating the heating roller, two sets of heating tubes 3 operate in two sets of heating holes 12 to heat the roller body of the heating roller 1 in the axial and circumferential directions. The heat conduction medium 4 in the two sets of heat conduction holes 13 absorbs the heat from the higher temperature areas in the axial and circumferential directions of the heating roller 1 and conducts the heat to the lower temperature areas in the axial and circumferential directions of the heating roller 1, thereby exchanging heat between the higher and lower temperature areas in the axial and circumferential directions of the heating roller 1 and achieving uniform heating of the heating roller 1 in both the axial and circumferential directions.

[0056] Meanwhile, the heat-conducting medium 4 in the medium cavity 133 partially vaporizes during the heating process. Under the pressure in the medium cavity 133, the vaporized heat-conducting medium 4 flows axially along the heat-conducting hole 13, rapidly exchanging heat between the high-temperature and low-temperature areas in the axial and circumferential directions of the heating roller 1, thereby rapidly homogenizing the heat-conducting hole 13 in the axial and circumferential directions and maintaining the uniformity of the outer circumferential surface temperature of the heating roller 1 during the heating process.

[0057] Furthermore, the vaporized heat transfer medium 4 pressurizes the medium cavity 133, increasing the boiling point of the heat transfer medium 4. The partially vaporized heat transfer medium 4 re-liquefies under pressure. Due to the partial liquefaction of the heat transfer medium 4, the pressure inside the medium cavity 133 decreases, and the partial vaporization of the heat transfer medium 4 fills the medium cavity 133. That is, the heat transfer medium 4 circulates in the medium cavity 133, undergoing a two-phase change of vaporization and liquefaction.

[0058] Example 5: The difference between Example 5 and Example 1 is that, as Figure 8 , Figure 9 As shown, heating holes 12 are circumferentially distributed in the inner ring of the heating roller 1, heat conduction holes 13 are circumferentially distributed in the outer ring of the heating roller 1, heating tube 3 passes through the heating holes 12, and heat conduction medium 4 is poured into the heat conduction holes 13 and sealed in the medium cavity 133 by the first sealing member 131.

[0059] The working principle of this embodiment is as follows: A shaft hole 11 is axially opened through the middle of the heating roller 1, and a set of heating holes 12 and a set of heat-conducting holes 13 are axially opened around the shaft hole 11. The heating holes 12 are distributed in the inner ring of the heating roller 1 near the shaft hole 11, and the heat-conducting holes 13 are distributed in the outer ring of the heating roller 1 near the outer circumference. The heating holes 12 are open at both ends through the heating roller 1, and the heat-conducting holes 13 are open at one end and closed at the other end. Then, the heating tube 3 is inserted into the heating hole 12, and the heat-conducting medium 4 is poured into the heat-conducting hole 13.

[0060] After the filling is completed, the first sealing block 131 is inserted into the opening of the heat conduction hole 13 and the heat conduction hole 13 is sealed by welding, and the heat conduction medium 4 is sealed in the medium cavity 133.

[0061] Then, the connecting shaft 2 is inserted into the shaft hole 11, and the roller shaft head 21 is welded and fixed to the end of the heating roller. The conductive slip ring 5 is inserted on the connecting shaft 2.

[0062] Finally, connect the rotor end electrical connection wire of the conductive slip ring 5 to the heating tube 3, and connect the stator end electrical connection wire of the conductive slip ring 5 to the power supply to power the heating tube 3.

[0063] When heating the heating roller, two sets of heating tubes 3 operate in two sets of heating holes 12 to heat the roller body of the heating roller 1 in the axial and circumferential directions. The heat conduction medium 4 in the two sets of heat conduction holes 13 absorbs the heat from the higher temperature areas in the axial and circumferential directions of the heating roller 1 and conducts the heat to the lower temperature areas in the axial and circumferential directions of the heating roller 1, thereby exchanging heat between the higher and lower temperature areas in the axial and circumferential directions of the heating roller 1 and achieving uniform heating of the heating roller 1 in both the axial and circumferential directions.

[0064] Meanwhile, the heat-conducting medium 4 in the medium cavity 133 partially vaporizes during the heating process. Under the pressure in the medium cavity 133, the vaporized heat-conducting medium 4 flows axially along the heat-conducting hole 13, rapidly exchanging heat between the high-temperature and low-temperature areas in the axial and circumferential directions of the heating roller 1, thereby rapidly homogenizing the heat-conducting hole 13 in the axial and circumferential directions and maintaining the uniformity of the outer circumferential surface temperature of the heating roller 1 during the heating process.

[0065] Furthermore, the vaporized heat transfer medium 4 pressurizes the medium cavity 133, increasing the boiling point of the heat transfer medium 4. The partially vaporized heat transfer medium 4 re-liquefies under pressure. Due to the partial liquefaction of the heat transfer medium 4, the pressure inside the medium cavity 133 decreases, and the partial vaporization of the heat transfer medium 4 fills the medium cavity 133. That is, the heat transfer medium 4 circulates in the medium cavity 133, undergoing a two-phase change of vaporization and liquefaction.

[0066] It should be noted that the heating holes 12 and heat conduction holes 13 in this application are not limited to two sets. Multiple sets can be set according to the thickness of the heating roller 1. The number of heating holes 12 and heat conduction holes 13 in each set can be set according to the thickness of the heating roller 1 as needed to ensure uniform heating of the heating roller 1 in the axial and circumferential directions.

[0067] In addition, in order to ensure the fluidity and uniformity of the heat-conducting medium 4 within the heat-conducting hole 13, a capillary mesh can be provided axially in the heat-conducting hole 13 so that the heat-conducting medium 4 can flow axially along the heat-conducting hole 13 through capillary action.

[0068] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A heating roller, comprising a heating roller, characterized in that: The heating roller has at least one set of heating holes and at least one set of heat conduction holes along its axial direction. A heating tube is inserted into the heating hole, and a heat conduction medium is placed inside the heat conduction hole. The heat conduction medium is sealed inside the heat conduction hole. The heating tube operates inside the heating hole to heat the roller body axially and circumferentially. The heat conduction medium exchanges heat with the higher temperature region and the lower temperature region in the axial and circumferential directions of the heat conduction hole, thereby achieving uniform heating of the heating roller axially and circumferentially.

2. A heating roller according to claim 1, characterized in that: The heating holes and heat-conducting holes are circumferentially spaced and alternately arranged. The heat-conducting holes are open at one end and closed at the other end. A first sealing block is provided at the open end of the heat-conducting hole. The first sealing block is welded to seal the heat-conducting port to form a medium cavity. The heat-conducting medium is sealed in the medium cavity.

3. A heating roller according to claim 2, characterized in that: The heat-conducting hole extends axially through the heating roller. A first sealing block and a second sealing block are respectively provided at the openings at both ends of the heat-conducting hole. The first sealing block and the second sealing block seal the two ends of the heat-conducting hole to form a medium cavity. The heat-conducting medium is poured into the medium cavity. The first sealing block and the second sealing block are fixedly connected to the heating roller.

4. A heating roller according to claim 1, characterized in that: The heating holes and heat-conducting holes are distributed on different circumferences of the heating roller. The heat-conducting holes are open at one end and closed at the other end. A first sealing block is provided at the open end of the heat-conducting hole. The first sealing block is welded to seal the heat-conducting port to form a medium cavity. The heat-conducting medium is sealed in the medium cavity.

5. A heating roller according to any one of claims 1 to 4, characterized in that: The heating roller has a shaft hole in the middle, and a connecting shaft is provided in the shaft hole. At least one end of the heating roller has a roller shaft head. The heating roller is fixedly connected to the connecting shaft through the roller shaft head. The roller shaft head is linked to the output end of the drive motor, which drives the heating roller to rotate circumferentially around the axis of the connecting shaft.

6. A heating roller according to claim 5, characterized in that: The heating element is an electric heating element, and a conductive slip ring is provided at the end of the connecting shaft. The heating element is electrically connected to the conductive slip ring.

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