Heating roller

Abstract

The invention discloses a heating roller, and belongs to the technical field of rollers, the heating roller comprises a liquid separation assembly, one end of the liquid separation assembly is rotatably connected with a rotary joint, one end, far away from the rotary joint, of the liquid separation assembly is connected with the heating roller, the heating roller is provided with a plurality of groups of U-shaped loops, and each group of U-shaped loops is provided with a liquid inlet and a liquid outlet; heat exchange is carried out in the process that a heating medium flows into the liquid outlet from the liquid inlet and flows out of the liquid outlet, so that the U-shaped loop forms a high-temperature section and a low-temperature section, the liquid inlet and the liquid outlet are both communicated with the liquid separation assembly and are both located on the side, close to the liquid separation assembly, of the U-shaped loop, and the high-temperature section and the low-temperature section are arranged on the surface of the heating roller in a staggered mode; therefore, the surface temperature of the heating roller is uniform. The high-temperature sections and the low-temperature sections of the U-shaped loop grooves are arranged on the shaft core in a staggered mode, so that it is guaranteed that the surface temperature of the whole heating roller is uniform, and the problem that the product quality is affected by the roller surface temperature difference is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of rollers, and in particular relates to a heating roller. Background Art

[0002] Roller heating equipment is a commonly used industrial heating equipment. The heating roller can heat the material, improve the performance of the material, and prevent the material from sticking or solidifying. Its basic principle is to heat the material passing through the roller through the heating roller installed on it. Common types of heating rollers include electric heating rollers, gas heating rollers and liquid heating rollers. In the printing and papermaking industries, gas heating rollers will produce condensed water, which will make the temperature control unstable, not only affecting the uniformity of the roller surface temperature, but also causing the roller to deform due to the temperature difference between the condensed water and the roller surface; liquid heating rollers include water circulation heating rollers and oil circulation heating rollers. When choosing which heating method to use, it is necessary to understand the basic process conditions when the heating roller is used, such as: the products produced and their main physical and chemical properties; the commonly used roller surface temperature and temperature accuracy; from the perspective of roller surface temperature, if the required temperature is very low (≤100℃), any heating method can be selected; if the temperature is between 100~160℃, water heating rollers cannot be selected, but steam heating, thermal oil heating, electric heating and electromagnetic induction heating can be used. If the roller surface temperature is greater than 160°C, steam heating is usually not selected. If the roller surface temperature exceeds 250°C, oil heating is rarely used due to the performance of heat transfer oil. At this time, liquid heating is abandoned and electric heating or electromagnetic heating is selected.

[0003] When using liquids to meet high temperature requirements within the heating range, oil is generally used as the heating medium. For safety reasons, the structure must have good sealing properties, and a higher safety factor is required for the inlet and outlet of the heating roller.

[0004] In the existing technology, the oil-heated roller is of single-circuit type, with high temperature at the liquid inlet. As the liquid flows along the circuit, the temperature gradually decreases, making the roller surface temperature uneven. The product is greatly affected by the temperature, resulting in a lower product qualification rate.

[0005] Therefore, it is urgent to design a heating roller to solve the problem of uneven roller surface temperature of the single-loop liquid heating roller mentioned above. Summary of the invention

[0006] In order to solve the technical problem of uneven roller surface temperature of a single-loop liquid heating roller mentioned in the background technology, a heating roller is provided to solve the above problem.

[0007] To achieve the above purpose, the specific technical solution of the heating roller of the present invention is as follows: A heating roller comprises a liquid separation component, one end of the liquid separation component is rotatably connected to a rotary joint, and the end of the liquid separation component away from the rotary joint is connected to the heating roller, a plurality of groups of U-shaped loops are arranged on the heating roller, each group of U-shaped loops is provided with a liquid inlet and a liquid outlet, and a heating medium is heat exchanged during the process of flowing from the liquid inlet to the liquid outlet, so that the U-shaped loop forms a high-temperature section and a low-temperature section, the liquid inlet and the liquid outlet are both located on a side of the U-shaped loop close to the liquid separation component, and the high-temperature section and the low-temperature section are alternately arranged on the surface of the heating roller to make the surface temperature of the heating roller uniform; The heating medium flows into the liquid inlet through the rotary joint and the liquid separation component in sequence, and flows out from the liquid outlet through the liquid separation component and the rotary joint.

[0008] Furthermore, a plurality of groups of U-shaped loop grooves are provided on the shaft core of the heating roller, and the liquid inlet and the liquid outlet are both provided on one side of the U-shaped loop groove close to the liquid separation component.

[0009] Furthermore, a liquid inlet pipeline and a liquid outlet pipeline are provided on the liquid separation component, one end of the liquid inlet pipeline is connected to the liquid inlet end of the rotary joint, the end of the liquid inlet pipeline away from the rotary joint is connected to the liquid inlet, one end of the liquid outlet pipeline is connected to the liquid outlet end of the rotary joint, and the end of the liquid outlet pipeline away from the rotary joint is connected to the liquid outlet. When the liquid separation component rotates with the heating roller, the liquid inlet pipeline and the liquid outlet pipeline are always connected to the rotary joint.

[0010] Furthermore, the liquid separation component includes a liquid separation tube and a liquid separation joint, the liquid separation tube is fixedly connected to the liquid separation joint, the liquid separation joint is provided with a first communication port and a second communication port, and the liquid separation tube is provided with a first pipeline and a second pipeline; The first communication port is sealed and connected to the liquid inlet, one end of the first communication port away from the liquid inlet is connected to the first pipeline, and one end of the first pipeline away from the first communication port is connected to the liquid inlet end of the rotary joint, thereby forming a liquid inlet pipeline on the liquid separation component; The second connecting port is sealed and connected to the liquid outlet, one end of the second connecting port away from the liquid outlet is connected to the second pipe, and one end of the second pipe away from the second connecting port is connected to the liquid outlet end of the rotary joint, thereby forming a liquid outlet pipeline on the liquid separation component.

[0011] Furthermore, a flange is circumferentially arranged on the outer wall of the liquid dispensing tube, and the flange is connected to the flange of the heating roller.

[0012] Furthermore, the shaft core of the heating roller is provided with a first-level groove and a second-level groove in sequence, the liquid outlet is provided on the peripheral side of the first-level groove, and the liquid inlet is provided on the peripheral side of the second-level groove; A first boss is provided on the liquid separation joint, and the shape of the first boss matches the shape of the first-level groove. The second connecting port is located on the peripheral side of the first boss and is matched and connected with the liquid outlet. The first connecting port is located on the bottom surface of the first boss away from the liquid separation tube. After the first boss is sealed and connected to the first-level groove, the first boss and the second-level groove jointly form a liquid separation cavity, and the heating medium flows into the liquid inlet after liquid separation through the liquid separation cavity.

[0013] Furthermore, the liquid separation cavity is a circular cavity, and the liquid inlets are evenly distributed on the side of the second-stage groove in the circumferential direction.

[0014] Furthermore, it also includes a transmission device, which is arranged on the same side of the heating roller where the liquid separation component is installed, and provides power for the heating roller and the liquid separation component to rotate relative to the rotary joint.

[0015] Furthermore, it also includes a transmission device, which is arranged on the same side of the heating roller where the liquid separation component is installed. The transmission device provides power for the heating roller and the liquid separation component to rotate relative to the rotary joint. A bearing is provided on the liquid separation component, the inner ring of the bearing is fixedly connected to the liquid separation component, and the outer ring of the bearing is fixedly connected to the structural plate of the roller heating device.

[0016] Furthermore, the liquid inlet pipeline is located in the liquid outlet pipeline, the transmission device is located between the bearing and the rotary joint, and an insulation cavity is provided on the liquid separation component, which is wrapped around the outside of the liquid outlet pipeline to isolate the transmission device and the bearing from the liquid outlet pipeline through the insulation cavity.

[0017] The heating roller of the present invention has the following advantages: the high temperature section and the low temperature section of the U-shaped loop are arranged alternately on the shaft core, and the liquid inlet and the liquid outlet are located on the same side, so as to ensure that the surface temperature of the entire heating roller is uniform, and solve the problem that the temperature difference of the roller surface affects the product quality; The transmission device and the rotary joint are set on the same side to improve safety performance. Because the transmission device runs at high speed, the rotary joint will generate high temperature. Therefore, if they are set on the same side, the other side can be used as a safe operation side, which can give operators more operating space. The temperature of the rotary joint of the transmission device is higher during continuous operation, so placing them on the same side can also make the operation safer; A heat-insulating cavity is provided to prevent the bearing and transmission device from overheating and affecting their service life; A plurality of sets of U-shaped loop grooves are directly opened on the shaft core of the heating roller, which can improve the airtightness of the overall pipeline circulation and further improve the safety performance of the heating roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the heating roller of the present invention.

[0019] Figure 2 It is a partial cross-sectional view of the heating roller of the present invention.

[0020] Figure 3 It is a schematic diagram of the shaft core structure of the present invention.

[0021] Figure 4 It is a schematic diagram of the enlarged structure of part A of the present invention.

[0022] Explanation of the markings in the figure: 1. Liquid separation component; 101. Liquid inlet pipeline; 102. Liquid outlet pipeline; 1011. Liquid separation chamber; 100. Liquid separation pipe; 1001. First pipeline; 1002. Second pipeline; 200. Liquid separation joint; 2001. First connecting port; 2002. Second connecting port; 2003. First boss; 2. Rotary joint; 201. Liquid inlet terminal; 202. Liquid outlet terminal; 3. Heating roller; 301. Shaft core; 3011. First-level groove; 3012. Second-level groove; 4. U-shaped loop groove; 401. High-temperature section; 402. Low-temperature section; 403. Liquid inlet; 404. Liquid outlet; 5. Bearing; 6. Transmission device; 7. Flange; 8. Insulation chamber; 9. Structural plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0025] Please refer to the attached Figure 1 To Attachment Figure 4 The heated roller of the present invention is described.

[0026] The existing liquid heating roller 3 is a single-loop type, and the temperature of the liquid inlet 403 is high. As the liquid flows along the loop, the temperature gradually decreases, making the roller surface temperature uneven. The product is greatly affected by the temperature, resulting in a lower product qualification rate.

[0027] Therefore, the present invention provides a heating roller 3, such as Figure 1-Figure 4As shown, it includes a liquid separation component 1, one end of the liquid separation component 1 is rotatably connected to the rotary joint 2, and the end of the liquid separation component 1 away from the rotary joint 2 is connected to the heating roller 3. The heating roller 3 is provided with a plurality of groups of U-shaped loops, each group of U-shaped loops is provided with a liquid inlet 403 and a liquid outlet 404. The heating medium flows from the liquid inlet 403 to the liquid outlet 404 to perform heat exchange, so that the U-shaped loop forms a high temperature section 401 and a low temperature section 402, that is, as the heating medium flows, the temperature of the heating medium gradually increases in the U-shaped loop. The temperature of the heating roller 3 is lowered, thereby generating a high temperature section 401 and a low temperature section 402. The principle is that the heat of the heating medium is transferred to the roller by heat exchange. The liquid inlet 403 and the liquid outlet 404 are both located on the side of the U-shaped loop close to the liquid separation component 1. The high temperature section 401 and the low temperature section 402 are arranged alternately on the surface of the heating roller 3 to make the surface temperature of the heating roller 3 uniform; the heating medium flows into the liquid inlet 403 through the rotary joint 2 and the liquid separation component 1 in turn, and flows out from the liquid outlet 404 through the liquid separation component 1 and the rotary joint 2.

[0028] Preferably, a plurality of groups of U-shaped loop grooves 4 are provided on the shaft core 301 of the heating roller 3, and a liquid inlet 403 and a liquid outlet 404 are both provided on a side of the U-shaped loop groove 4 close to the liquid separation component 1. Specifically, one end of the liquid separation component 1 is rotatably connected to the rotary joint 2, and one end of the liquid separation component 1 away from the rotary joint 2 is fixedly connected to the shaft core 301 of the heating roller 3. A plurality of groups of U-shaped loop grooves 4 are provided in the shaft core 301, and each group of U-shaped loop grooves 4 is provided with a liquid inlet 403 and a liquid outlet 404. The heating medium performs heat exchange in the process of flowing from the liquid inlet 403 to the liquid outlet 404, so that the U-shaped loop groove 4 forms a high-temperature section 401 and a low-temperature section 402. The liquid inlet 403 and the liquid outlet 404 are both connected to the liquid separation component 1, and the liquid inlet 403 and the liquid outlet 404 are both located on the same side close to the liquid separation component 1. The high-temperature section 401 and the low-temperature section 402 are staggered on the shaft core 301 to make the surface temperature of the heating roller 3 uniform, and make the U-shaped loop more sealed, which is convenient for processing and molding.

[0029] Specifically, the circulation direction of the heating medium is as follows: Figure 2As shown, the heating medium enters the multiple groups of U-shaped loop grooves 4 opened on the shaft core 301 from the rotary joint 2 through the liquid separation component 1. Each group of U-shaped loop grooves 4 has a liquid inlet 403 and a liquid outlet 404, and the liquid inlet 403 and the liquid outlet 404 are located on the same side of the shaft core 301. The heating medium completes a small cycle in each group of U-shaped loop grooves 4. The entire shaft core 301 has multiple groups of circulation loops. In each group of loops, the temperature of the liquid inlet 403 is high. As the heating medium flows along the U-shaped loop grooves 4, the liquid inlet 403 is at a high temperature. The temperature of the heating medium gradually decreases, and the temperature of the heating medium reaches the lowest at the liquid outlet 404. However, the positions of the liquid inlet 403 and the liquid outlet 404 of all circuits are on the same side, and the liquid inlet 403 and the liquid outlet 404 are arranged adjacent to each other, so that the high temperature of the liquid inlet 403 and the low temperature of the liquid outlet 404 can be neutralized by heat exchange, and the high temperature section 401 and the low temperature section 402 are arranged alternately on the shaft core 301, so as to ensure that the surface temperature of the entire heating roller 3 is uniform. Among them, in order to enhance the heating effect of the heating roller 3, the heating medium is set to oil. At the same time, it can be understood that the heating medium can also be selected from other liquids according to actual conditions, which is not limited here.

[0030] In another specific embodiment, a plurality of U-shaped pipe loops may be arranged between the outer wall of the heating roller 3 and the shaft core 301 of the heating roller 3, the liquid inlet 403 and the liquid outlet 404 of the U-shaped pipe loop are both connected to the liquid separation component 1, and the liquid inlet position and the liquid outlet 404 position are both located on the side of the U-shaped pipe loop close to the liquid separation component 1.

[0031] Preferably, a liquid inlet pipeline 101 and a liquid outlet pipeline 102 are provided on the liquid separation component 1, one end of the liquid inlet pipeline 101 is connected to the liquid inlet terminal 201 of the rotary joint 2, the end of the liquid inlet pipeline 101 away from the rotary joint 2 is connected to the liquid inlet port 403, one end of the liquid outlet pipeline 102 is connected to the liquid outlet terminal 202 of the rotary joint 2, and the end of the liquid outlet pipeline 102 away from the rotary joint 2 is connected to the liquid outlet port 404. When the liquid separation component 1 rotates with the heating roller 3, the liquid inlet pipeline 101 and the liquid outlet pipeline 102 are always connected to the rotary joint 2. Specifically, the heating medium flows in from the liquid inlet end 201 of the rotary joint 2, flows into the liquid inlet 403 of the U-shaped loop through the liquid inlet pipeline 101, and is guided by the U-shaped loop to flow to the liquid outlet 404. The heating medium flows into the liquid outlet pipeline 102 through the liquid outlet 404, and finally flows out from the liquid outlet end 202 of the rotary joint 2, completing the overall liquid loop circulation.

[0032] As a preferred example, Figure 2As shown, the liquid separation component 1 includes a liquid separation tube 100 and a liquid separation joint 200, the liquid separation tube 100 is fixedly connected to the liquid separation joint 200, the liquid separation joint 200 is provided with a first communication port 2001 and a second communication port 2002, and the liquid separation tube 100 is provided with a first pipeline 1001 and a second pipeline 1002; the first communication port 2001 is sealed and connected to the liquid inlet 403, and the end of the first communication port 2001 away from the liquid inlet 403 is connected to the first pipeline 1001, and the first pipeline 100 1 is connected to the liquid inlet end 201 of the rotary joint 2 at one end away from the first communication port 2001, thereby forming the liquid inlet pipeline 101 on the liquid separation component 1; the second communication port 2002 is sealed and connected to the liquid outlet 404, the second communication port 2002 is connected to the second pipe 1002 at one end away from the liquid outlet 404, and the second pipe 1002 is connected to the liquid outlet end 202 of the rotary joint 2 at one end away from the second communication port 2002, thereby forming the liquid outlet pipeline 102 on the liquid separation component 1. Specifically, the heating medium flows through the first pipe 1001 and the first communication port 2001 of the liquid inlet pipeline 101 in sequence and then enters the U-shaped loop groove 4. After flowing out of the U-shaped loop groove 4, the heating medium flows through the second communication port 2002 and the second pipe 1002 of the liquid outlet pipeline 102 in sequence and then flows out from the liquid outlet end 202 of the rotary joint 2.

[0033] Preferably, a flange 7 is circumferentially provided on the outer wall of the liquid dispensing tube 100, and the flange 7 is flange-connected to the heating roller 3, thereby ensuring the sealing of the heating medium and the convenience of repair and maintenance.

[0034] As a preferred example, Figure 4As shown, the shaft core 301 of the heating roller 3 is provided with a first-level groove 3011 and a second-level groove 3012 in sequence, the liquid outlet 404 is provided on the peripheral side of the first-level groove 3011, and the liquid inlet 403 is provided on the peripheral side of the second-level groove 3012; a first boss 2003 is provided on the liquid separation joint 200, and the shape of the first boss 2003 matches the shape of the first-level groove 3011, the second connecting port 2002 is located on the peripheral side of the first boss 2003, and is matched and connected with the liquid outlet 404, the first connecting port 2001 is located on the bottom surface of the first boss 2003 away from the liquid separation tube 100, after the first boss 2003 is sealed and connected with the first-level groove 3011, the first boss 2003 and the second-level groove 3012 jointly form a liquid separation chamber 1011, and the heating medium flows into the liquid inlet 403 after liquid separation through the liquid separation chamber 1011. Specifically, the heating medium enters the U-shaped loop groove 4 through the liquid separation chamber 1011, and the sealing connection between the first boss 2003 and the first-level groove 3011 ensures the tightness of the flow of the heating medium in the pipeline and avoids the leakage of the heating medium at the liquid outlet 404 into the second-level groove 3012, thereby avoiding the cross-flow of the heating medium. The shape of the first boss 2003 matches the shape of the first-level groove 3011, thereby achieving guiding fixation during installation, making it convenient for personnel to connect the liquid separation component 1 with the heating roller 3 through the flange 7.

[0035] Preferably, the liquid separation chamber 1011 is a circular cavity, and the liquid inlet 403 is evenly distributed on the side of the second-level groove 3012. Specifically, the liquid separation chamber 1011 is a circular cavity to reduce the resistance difference of the heating medium in the liquid separation chamber 1011. At the same time, it can be understood that the shape of the liquid separation chamber 1011 can also be set to other symmetrical or evenly distributed structures to ensure that the liquid flowing out of each liquid inlet 403 is relatively uniform, and the liquid outlet 404 is evenly distributed on the side of the second-level groove 3012, that is, evenly distributed on the side of the liquid separation chamber 1011, thereby further ensuring that the heating medium can flow out evenly from each liquid inlet 403.

[0036] Preferably, the heating roller 3 further includes a transmission device 6, which is arranged on the same side of the heating roller 3 as the liquid separation component 1, and provides power for the heating roller 3 and the liquid separation component 1 to rotate relative to the rotary joint 2. Specifically, arranging the transmission device 6 and the rotary joint 2 on the same side can provide a larger space on the operating side. At the same time, the transmission device 6 rotates at a high speed during continuous operation, which is prone to safety accidents. In addition, the temperature of the rotary joint 2 is also high due to the inflow and outflow of the heating medium at the rotary joint 2, and personnel are easily scalded. Therefore, placing them on the same side increases the safety of personnel operation.

[0037] like Figure 2As shown, a bearing 5 is provided on the dispensing tube 100, the inner ring of the bearing 5 is fixedly connected to the dispensing tube 100, and the outer ring of the bearing 5 is fixedly connected to the structural plate 9 of the roller heating device, so that the heating roller 3 cooperates with the heating roller 3 rotating rod at one end away from the dispensing component 1 and is rotatably connected to the structural plate 9 of the roller heating device, so that the heating roller 3 rotates relative to the roller heating device.

[0038] Preferably, the liquid inlet pipeline 101 is located in the liquid outlet pipeline 102, the transmission device 6 is located between the bearing 5 and the rotary joint 2, and the liquid separation component 1 is provided with an insulation cavity 8, which is wrapped around the outside of the liquid outlet pipeline 102 to isolate the transmission device 6 and the bearing 5 from the liquid outlet pipeline 102 through the insulation cavity 8. Figure 2 As shown, in a specific embodiment, it can be configured as follows: a bearing 5 is arranged on the dispensing tube 100, the inner ring of the bearing 5 is fixedly connected to the dispensing tube 100, the outer ring of the bearing 5 is fixedly connected to the structural plate 9 of the roller heating device, and the transmission device 6 is located between the bearing 5 and the rotary joint 2; the dispensing tube 100 includes, from the inside to the outside, an inner tube, an outer tube and a sleeve, the inner tube is used as the specific structure of the first pipeline 1001, and forms a liquid inlet pipeline 101 located on the dispensing tube 100; the outer tube is sleeved on the inner tube, and a gap is left between the outer tube and the inner tube as the specific structure of the second pipeline 1002, and forms a liquid outlet pipeline 102 located on the dispensing tube 100; the sleeve is sleeved on the outer tube, and a closed gap is left between the sleeve and the outer tube, thereby forming a heat-insulating cavity 8, and the outer side wall of the outer tube is fixedly connected with the bearing 5 and the transmission device 6. Specifically, the liquid inlet pipeline 101 for transporting high-temperature heating medium is wrapped by the liquid outlet pipeline 102 for returning low-temperature heating medium, forming a first layer of thermal insulation protection between the bearing 5 and the transmission device 6 and the high-temperature liquid inlet pipeline 101. The liquid outlet pipeline 102 is wrapped by the insulation cavity 8, and the insulation cavity 8 forms a gas insulation protection layer, which becomes the second layer of thermal insulation protection between the bearing 5 and the transmission device 6 and the high-temperature liquid inlet pipeline 101, thereby further ensuring that the temperature of the bearing 5 and the transmission device 6 will not be too high, avoiding overheating of the liquid separation component 1, thereby reducing the service life of the bearing 5 and the transmission device 6 installed on the liquid separation component 1.

[0039] The present invention arranges the high temperature section 401 and the low temperature section 402 of the U-shaped loop alternately on the shaft core 301, thereby ensuring that the surface temperature of the entire heating roller 3 is uniform, solving the problem that the roller surface temperature difference affects the product quality, and arranging the transmission device 6 and the rotary joint 2 on the same side can give the operator a larger operating space. The transmission device 6 has a high speed during continuous operation, which is prone to safety accidents. In addition, due to the inflow and outflow of the heating medium at the rotary joint 2, the temperature of the rotary joint 2 is also high, and people are easily scalded. Therefore, placing them on the same side increases the safety of personnel operation.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A heating roller, characterized in that: It includes a liquid separation component, one end of the liquid separation component is rotatably connected to the rotary joint, and the end of the liquid separation component away from the rotary joint is connected to the heating roller. The heating roller is provided with multiple groups of U-shaped loops, each group of U-shaped loops is provided with a liquid inlet and a liquid outlet, and the heating medium is heat exchanged during the process of flowing from the liquid inlet to the liquid outlet, so that the U-shaped loop forms a high-temperature section and a low-temperature section, the liquid inlet and the liquid outlet are both located on the side of the U-shaped loop close to the liquid separation component, and the high-temperature section and the low-temperature section are staggered on the surface of the heating roller to make the surface temperature of the heating roller uniform; The heating medium flows into the liquid inlet through the rotary joint and the liquid separation component in sequence, and flows out from the liquid outlet through the liquid separation component and the rotary joint.

2. The heating roller according to claim 1, characterized in that: A plurality of groups of U-shaped loop grooves are arranged on the shaft core of the heating roller, and the liquid inlet and the liquid outlet are both arranged on one side of the U-shaped loop groove close to the liquid separation component.

3. The heating roller according to claim 1 or 2, characterized in that: The liquid separation component is provided with a liquid inlet pipeline and a liquid outlet pipeline, one end of the liquid inlet pipeline is connected with the liquid inlet end of the rotary joint, the end of the liquid inlet pipeline away from the rotary joint is connected with the liquid inlet, one end of the liquid outlet pipeline is connected with the liquid outlet end of the rotary joint, and the end of the liquid outlet pipeline away from the rotary joint is connected with the liquid outlet. When the liquid separation component rotates with the heating roller, the liquid inlet pipeline and the liquid outlet pipeline are always connected with the rotary joint.

4. The heating roller according to claim 3, characterized in that: The liquid dispensing assembly comprises a liquid dispensing tube and a liquid dispensing joint, wherein the liquid dispensing tube is fixedly connected to the liquid dispensing joint, the liquid dispensing joint is provided with a first communication port and a second communication port, and the liquid dispensing tube is provided with a first pipeline and a second pipeline; The first communication port is sealed and connected to the liquid inlet, one end of the first communication port away from the liquid inlet is connected to the first pipeline, and one end of the first pipeline away from the first communication port is connected to the liquid inlet end of the rotary joint, thereby forming a liquid inlet pipeline on the liquid separation component; The second connecting port is sealed and connected to the liquid outlet, one end of the second connecting port away from the liquid outlet is connected to the second pipe, and one end of the second pipe away from the second connecting port is connected to the liquid outlet end of the rotary joint, thereby forming a liquid outlet pipeline on the liquid separation component.

5. The heating roller according to claim 4, characterized in that: A flange is circumferentially arranged on the outer wall of the liquid dispensing tube, and the flange is connected to the flange of the heating roller.

6. The heating roller according to claim 4, characterized in that: The shaft core of the heating roller is provided with a first-level groove and a second-level groove in sequence, the liquid outlet is provided on the peripheral side of the first-level groove, and the liquid inlet is provided on the peripheral side of the second-level groove; A first boss is provided on the liquid separation joint, and the shape of the first boss matches the shape of the first-level groove. The second connecting port is located on the peripheral side of the first boss and is matched and connected with the liquid outlet. The first connecting port is located on the bottom surface of the first boss away from the liquid separation tube. After the first boss is sealed and connected to the first-level groove, the first boss and the second-level groove jointly form a liquid separation cavity, and the heating medium flows into the liquid inlet after liquid separation through the liquid separation cavity.

7. The heating roller according to claim 6, characterized in that: The liquid separation cavity is a circular cavity, and the liquid inlets are evenly distributed on the side of the second-stage groove in the circumferential direction.

8. The heating roller according to claim 1, characterized in that: It also includes a transmission device, which is arranged on the same side of the heating roller where the liquid separation component is installed, and provides power for the heating roller and the liquid separation component to rotate relative to the rotary joint.

9. The heating roller according to claim 3, characterized in that: It also includes a transmission device, which is arranged on the same side of the heating roller where the liquid separation component is installed. The transmission device provides power for the heating roller and the liquid separation component to rotate relative to the rotary joint. A bearing is provided on the liquid separation component, the inner ring of the bearing is fixedly connected to the liquid separation component, and the outer ring of the bearing is fixedly connected to the structural plate of the roller heating equipment.

10. The heating roller according to claim 9, characterized in that: The liquid inlet pipeline is located in the liquid outlet pipeline, the transmission device is located between the bearing and the rotary joint, and the liquid separation component is provided with an insulation cavity, which is wrapped around the outside of the liquid outlet pipeline to isolate the transmission device and the bearing from the liquid outlet pipeline through the insulation cavity.

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