Light water-cooling roller body with air self-exhausting function and cooling method

Abstract

The invention provides a light water-cooling roller body with an air self-exhausting function and a cooling method, the light water-cooling roller body comprises an inner roller and an outer roller, the inner roller and the outer roller are hollow cylinders, the outer roller is coaxially arranged on the outer side of the inner roller in a sleeving mode, and an upper roller cover and a lower roller cover are arranged on the two sides of the outer roller respectively; the outer roller comprises a water inlet channel, a water outlet channel and an extension pipe, the water inlet channel and the water outlet channel which are not communicated are formed in the left side and the right side of the radial center of the inner roller respectively, the water inlet channel coaxially sleeves the center of the inner side shaft of the upper roller cover, and the water outlet channel coaxially sleeves the center of the inner side shaft of the lower roller cover. A roller body water-cooling cavity is formed between the inner roller and the outer roller, pore plates are arranged on the two sides of the roller body water-cooling cavity and the inner roller, water through holes are formed in the pore plates, a buffer cavity is formed between the outer roller and the pore plates, the buffer cavity is communicated with the roller body water-cooling cavity through the water through holes, and the water inlet channel and the water outlet channel are communicated with the buffer cavity through extension pipes. And the extension pipe extends to the top of the buffer cavity. On the basis of a traditional water-cooling roller body, the extension pipe, the roller body water-cooling cavity, the concentric hollow inner roller embedded in the roller body water-cooling cavity and other structures are added, the functions of light weight and automatic air exhaust of the cooling roller body are achieved, the roller body rotates more smoothly, and the cooling effect is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of mechanical equipment, and more specifically, to a lightweight water-cooled roller body with a self-air exhausting function. Background Art

[0002] A roller is a cylindrical part. According to different uses, rollers can be divided into driving rollers and driven rollers or power rollers and non-power rollers, and sometimes they can also be used as sealing components; according to different roller structures, they can be divided into cylindrical rollers and conical rollers, etc.; according to different surface treatment requirements, the types of rollers include galvanized rollers, chrome-plated rollers, nickel-plated rollers, painted rollers, rubber-coated rollers, Teflon-sprayed rollers, polished rollers, mirror rollers, etc.; according to functional uses, rollers can be classified into heating rollers, cooling rollers, supporting rollers, conveying guide rollers, etc.

[0003] In some scenarios, it is necessary to introduce cooling water into the roller to reduce the surface temperature of the roller, so as to achieve the purpose of reducing the temperature of the conveyed object, or reducing the bonding rate of thermosetting materials on the surface.

[0004] The inventor of the present invention found that: most of the traditional rollers with water-cooling cavities are of a completely hollow internal structure, with a relatively heavy mass. Sometimes, the water-cooling pipes are likely to bring in gas, resulting in gas distribution in the water-cooling cavity inside the roller. The increase in gas causes the water body to shake inside the roller body, and the overall mass distribution is uneven, resulting in poor dynamic balance during the rotation of the roller; sometimes, due to the relatively long roller body of the roller, the mass is large after being filled with cooling water, and obvious shaking will also occur during rotation.

[0005] As Figure 1 shown, Figure 1 it is a common water-cooled roller structure. The water cavity inside the roller body is an integral structure, with a relatively large mass after being filled with water. And after air enters the roller body along with the water pipe, due to the action of gravity, it will always exist above the water, and the interface between air and water is high, making it difficult to exhaust the air, resulting in uneven mass distribution during the rotation of the entire roller body and relatively large shaking. Summary of the Invention

[0006] To overcome the deficiencies of the above-mentioned prior art, the present invention improves the structure of the roller, and provides a lightweight water-cooled roller body with a self-air exhausting function and a cooling method, realizing the lightweight of the roller body and the self-air exhausting function.

[0007] A lightweight water-cooled roller body with a self-air exhausting function includes an inner roller and an outer roller. Both the inner roller and the outer roller are hollow cylinders. The outer roller is coaxially sleeved outside the inner roller, and an upper cover and a lower cover are respectively arranged on both sides of the outer roller.

[0008] The outer roller includes a water inlet channel, a water outlet channel, and an extension pipe. Non-penetrating water inlet and outlet channels are respectively provided on the left and right sides along the radial center of the inner roller. The water inlet channel is coaxially sleeved at the inner shaft center of the upper cylinder cover, and the water outlet channel is coaxially sleeved at the inner shaft center of the lower cylinder cover. A roller body water cooling cavity is formed between the inner roller and the outer roller. Orifice plates are provided on both sides of the roller body water cooling cavity and the inner roller, and water passing holes are provided on the orifice plates. A buffer cavity is formed between the outer roller and the orifice plate. The buffer cavity is communicated with the roller body water cooling cavity through the water passing holes. Both the water inlet channel and the water outlet channel are communicated with the buffer cavity through the extension pipe, and the extension pipe extends to the top of the buffer cavity.

[0009] Preferably, the inner roller is a hollow structure and does not fill any substances inside, and the length of the roller body water cooling cavity is the same as that of the inner roller.

[0010] Preferably, the number of the water passing holes is several and the openings are small, and they are evenly distributed along the circumferential side of the inner roller. The water passing holes and the roller body water cooling cavity are horizontally distributed on the left and right.

[0011] Preferably, the water inlet channel is communicated with the outside through a water inlet, and the water outlet channel is communicated with the outside through a water outlet.

[0012] Preferably, the water inlet channel is provided with a plurality of first through holes, and the number of the first through holes is several and they are sequentially annularly distributed along the circumferential side of the water inlet channel from left to right.

[0013] Preferably, the water outlet channel is provided with a plurality of second through holes, and the number of the second through holes is several and they are sequentially annularly distributed along the circumferential side of the water outlet channel from left to right.

[0014] Preferably, the extension pipe includes a water inlet extension pipe and a water outlet extension pipe. The number of the water inlet extension pipes is the same as the number of the first through holes and the positions correspond one by one. The water inlet extension pipe is connected to the water inlet channel through the first through hole, and the water inlet extension pipe and the water inlet pipe are vertically distributed at 90 degrees.

[0015] Preferably, the number of the water outlet extension pipes is the same as the number of the second through holes and the positions correspond one by one. The water outlet extension pipe and the water outlet channel are vertically connected at 90 degrees.

[0016] Preferably, the buffer cavity is divided into a water inlet buffer cavity and a water outlet buffer cavity. The water inlet buffer cavity is located on the left side of the inner roller and is connected to the water inlet channel through the water inlet extension pipe. The water outlet buffer cavity is located on the right side of the inner roller, and the water outlet buffer cavity is connected to the water outlet channel through the water outlet extension pipe.

[0017] Preferably, the water outlet end of the water inlet extension pipe is close to the top of the water inlet buffer cavity, the water inlet end of the water outlet extension pipe is close to the top of the water outlet buffer cavity, and both the water inlet end of the water outlet extension pipe and the water outlet end of the water inlet extension pipe are horizontally distributed with the water passing holes.

[0018] To achieve the above object, the present invention provides the following technical solutions:

[0019] A cooling method, based on a lightweight water-cooled roll body with self-air-exhausting function described in any one of the above, includes the following steps:

[0020] (1) External cooling water enters the water inlet channel from the water inlet, and flows into the water inlet buffer cavity through a number of first through holes and the water inlet extension pipe;

[0021] (2) The cooling water accumulates in the water inlet buffer cavity. After accumulating to a certain extent, it will enter the roll body water-cooling cavity along the water through holes to cool the roll body;

[0022] (3) The cooling water enters the water outlet buffer cavity through the roll body water-cooling cavity, and a certain amount of water will accumulate in the water outlet buffer cavity for a period of time. After the cooling water in the water outlet buffer cavity accumulates to a certain extent, it can flow into the water outlet channel through the water outlet extension pipe and the second through hole;

[0023] (4) The cooling liquid in the water outlet channel flows from the water outlet to the outside.

[0024] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0025] 1. On the basis of the traditional cold roll body, the present invention adds an extension pipe, a roll body water-cooling cavity and an internally nested concentric inner roll cylinder. Since the density of air is smaller than that of water, air will be distributed above the water. Air and cooling water are distributed one above the other in the buffer cavity. Coupled with the fact that the end of the extension pipe extends to the top of the buffer cavity, this enables air to enter the extension pipe first and be discharged from the extension pipe first, and then the cold water is discharged. In this process, air is discharged from the inside of the roll body to the greatest extent, effectively alleviating the problem of uneven distribution of the rotating mass of the roll body. At the same time, due to the increased distribution ratio of the cooling water, the cooling effect has also been significantly improved.

[0026] 2. The cooling water enters the water inlet buffer cavity from the water inlet channel and the water inlet extension pipe, and enters the roll body water-cooling cavity through the water through holes. Since there is an orifice plate between the buffer cavity and the roll body water-cooling cavity and the water through holes on the orifice plate have a small opening, on the one hand, the water inlet can be buffered by the orifice plate, the flow rate can be slowed down, and the impact on the rotating roll body can be reduced. On the other hand, since a circular tube is nested inside the roll body water-cooling cavity, on the premise of meeting the water-cooling requirements, the mass of water is reduced as much as possible, making the roll body lighter and the rotation more stable.

[0027] The advantages of the additional aspects of the present invention will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0028] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments and descriptions thereof of the invention are used to explain the invention and do not unduly limit the invention.

[0029] Figure 1 It is a schematic diagram of a common water-cooled roller structure.

[0030] Figure 2 It is a schematic diagram of the lightweight roller body structure of the present invention.

[0031] Figure 3 It is a schematic diagram of the detailed structure of the lightweight roller body of the present invention.

[0032] Figure 4 It is a schematic diagram of the positional relationship between the water passing holes and the inner roller body of the present invention.

[0033] Figure 5 It is a schematic diagram of the air exhaust effect of the lightweight roller body of the present invention.

[0034] In the figure: 1, inner roller; 2, outer roller; 3, upper cylinder cover; 4, lower cylinder cover; 5, water inlet channel; 6, water outlet channel; 7, extension pipe; 8, buffer cavity; 9, roller body water cooling cavity; 10, orifice plate; 11, water passing hole; 12, water inlet; 13, water outlet; 14, first through hole; 15, second through hole; 16, water inlet extension pipe; 17, water outlet extension pipe; 18, water inlet buffer cavity; 19, water outlet buffer cavity. Detailed Description of the Invention

[0035] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs; it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention.

[0036] Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0037] Embodiment 1

[0038] As Figure 2 — Figure 4 shown, a lightweight water-cooled roller body with a self-air exhausting function includes an inner roller 1 and an outer roller 2. Both the inner roller 1 and the outer roller 2 are hollow cylinders. The outer roller is coaxially sleeved outside the inner roller, and an upper cylinder cover 3 and a lower cylinder cover 4 are respectively arranged on both sides of the outer roller.

[0039] The outer roller includes a water inlet channel 5, a water outlet channel 6 and an extension pipe 7. Non-penetrating water inlet channel 5 and water outlet channel 6 are respectively arranged on the left and right sides along the radial center of the inner roller. The water inlet channel 5 is coaxially sleeved at the inner shaft center of the upper cylinder cover 3, and the water outlet channel 6 is coaxially sleeved at the inner shaft center of the lower cylinder cover. Orifice plates 10 are arranged on both sides between the roller body water cooling cavity and the inner roller. Water passing holes 11 are arranged on the orifice plates. A buffer cavity 8 is formed between the outer roller and the orifice plate. A roller body water cooling cavity 9 is formed between the inner roller 1 and the outer roller 2. The buffer cavity is communicated with the roller body water cooling cavity through the water passing holes 11. Both the water inlet channel and the water outlet channel are communicated with the buffer cavity 8 through the extension pipe, and the extension pipe extends to the top of the buffer cavity.

[0040] Specifically, as Figure 3 and Figure 4 shown, the length of the roller body water cooling cavity 9 is the same as that of the inner roller 1. The inner part of the inner roller is a hollow structure and does not fill any substances. The cross-sectional area of the inner roller is much larger than that of the outer roller. In this way, the space between the inner roller and the outer roller, such as the roller body water cooling cavity and the buffer cavity, can naturally reduce the volume of the liquid that can be accommodated. Coupled with the hollow setting inside the inner roller, this can reduce the mass of the water in the water-cooled roller as much as possible on the premise of meeting the water-cooling requirements, making the roller body lighter and the rotation more stable.

[0041] In order to better separate and seal the inner roller and the outer roller reasonably and ensure that they do not communicate with each other, orifice plates are arranged at both ends of the inner roller 1 in this embodiment. The positions of the orifice plates are vertically opposite and connected with the orifice plates between the buffer cavity 8 and the roller body water cooling cavity 9. In this way, the inner roller is sealed by the two orifice plates 10 on the left and right. There are no through holes in the part of the orifice plate 10 facing the inner roller. In this way, a closed space can be formed for the inner roller through the orifice plate. Since the outer roller is coaxially sleeved outside the inner roller, the sealing performance between the inner roller and the outer roller can be guaranteed, so as to ensure that the cooling water in the outer roller will not enter the inner part of the inner roller.

[0042] To ensure that the cooling water entering the buffer chamber does not immediately enter the roll body water cooling chamber (let the cooling water accumulate first), in this embodiment, the water through holes 11 are arranged at the position directly opposite to the roll body water cooling chamber 9 on the orifice plate 10. The number of water through holes 11 is several and they are evenly distributed along the circumferential side of the inner roll. The opening sizes of the inlets and outlets of the water through holes are not very large, but they can meet the cooling water flow between the buffer chamber and the roll body water cooling chamber. In this embodiment, the number of water inlet holes is preferably set to 8. The water through holes and the roll body water cooling chamber are horizontally distributed left and right. In this embodiment, due to the orifice plate being provided in the structure, and the water through holes being provided only at the position directly opposite to the roll body water cooling chamber, the water through holes are arranged close to the middle position of the roll body water cooling chamber. Only when the water in the buffer chamber accumulates to a certain extent will it reach the height position of the water through holes. Relying on the orifice plate, the cooling water entering the buffer chamber can get a good buffering opportunity, and the flow rate of the water entering the roll body water cooling chamber can be reduced through the small-diameter water through holes. The impact of the low-flow water body on the rotating roll body will naturally be reduced, and the service life of the lightweight water-cooled roll body can also be improved.

[0043] As Figure 3 shown, the outer roll is connected to the external water source supply through the water inlet channel 5 and the water outlet channel 6 respectively. Specifically, the water inlet channel and the water outlet channel are symmetrically distributed left and right with respect to the inner roll. The water inlet channel is located on the left side of the inner roll and is connected to the outside through the water inlet 12. The external cooling water can enter the internal space of the outer roll through the water inlet 12. The water outlet channel is located on the right side of the inner roll and is connected to the outside through the water outlet 13. The air and water inside the lightweight roll body can be discharged in sequence through the water outlet channel and the water outlet.

[0044] To enable the water in the water inlet channel and the water outlet channel to smoothly enter the buffer chamber, in this embodiment, the water inlet channel is provided with a plurality of first through holes 14. The number of the first through holes is several, and they are sequentially annularly distributed along the circumferential side of the water inlet channel from left to right. In this way, the external cooling water obtained from the water inlet can enter the buffer chamber as much as possible under the guiding action of the plurality of first through holes, effectively avoiding the deposition of the cooling water in the water inlet channel and accelerating the speed of transporting the cooling water; the situation of the through holes on the water outlet channel is similar to that of the water inlet channel. The water outlet channel is provided with a plurality of second through holes 15. The number of the second through holes is several, and they are sequentially annularly distributed along the circumferential side of the water outlet channel from left to right. In this way, the cooling water can also quickly enter the water outlet through holes through the plurality of second through holes, and the rates of the cooling water entering and exiting the channels on the left and right sides are equal, realizing the balance of the cooling water inflow and outflow.

[0045] To achieve the connection between the water inlet channel and the water outlet channel and the buffer chamber respectively, the extension pipe 7 in this embodiment includes a water inlet extension pipe 16 and a water outlet extension pipe 17. The number of water inlet extension pipes is the same as the number of the first through holes and their positions correspond one by one. The water inlet extension pipe 16 is connected to the water inlet channel through the first through hole 14. The water inlet extension pipe and the water inlet pipe are vertically distributed at a 90-degree angle. The setting of the 90-degree vertical angle can increase the self-air discharge effect of the roller body. The number of water outlet extension pipes 17 is the same as the number of the second through holes and their positions correspond one by one. The water outlet extension pipe is connected to the water outlet channel through the second through hole 15. The water outlet extension pipe and the water outlet channel 6 are vertically distributed at a 90-degree angle.

[0046] As Figure 3 As shown in the figure, in this embodiment, both the water inlet channel and the water outlet channel are connected to the buffer chamber through the extension pipe, and the extension pipe extends to the bottom of the buffer chamber; specifically, the buffer chamber 8 in this embodiment includes a water inlet buffer chamber 18 and a water outlet buffer chamber 19. The water inlet buffer chamber 18 is located on the left side of the inner roller, and it is connected to the water inlet channel through the water inlet extension pipe. The water outlet buffer chamber 19 is located on the right side of the inner roller. The water outlet buffer chamber is connected to the water outlet channel through the water outlet extension pipe. The water inlet end of the water outlet extension pipe and the water outlet end of the water inlet extension pipe are horizontally distributed with the water through holes. This can make the water entering the water outlet buffer chamber from the water cooling chamber of the roller body also accumulate in the water outlet buffer chamber, slowing down the impact effect of the cooling water on the roller barrel.

[0047] The water outlet end of the water inlet extension pipe is close to the top of the water inlet buffer chamber, and the water inlet end of the water outlet extension pipe is close to the top of the water outlet buffer chamber. The water inlet end of the water outlet extension pipe and the water outlet end of the water inlet extension pipe are horizontally distributed with the water through holes. Since both the water inlet buffer chamber and the water outlet buffer chamber itself have a certain storage space, the water entering the water inlet buffer chamber from the water inlet extension pipe will first accumulate in the water inlet buffer chamber. Similarly, the water entering the water outlet buffer chamber from the water cooling chamber of the roller body will also accumulate in the water outlet buffer chamber. Since the density of air is smaller than that of water, the air and water in the buffer chamber will show a distribution form with air on the upper side and water on the lower side accumulating in the buffer chamber. In addition, the water inlet end of the water outlet extension pipe is close to the end of the water outlet buffer chamber. This will make the air in the water outlet buffer chamber enter the water outlet extension pipe first, and then the water flows into it; the air enters the extension pipe first and is discharged from the extension pipe first, and then the cold water is discharged. In this process, the air is discharged from the inside of the roller body to the greatest extent, effectively alleviating the problem of uneven distribution of the rotating mass of the roller body. At the same time, due to the increase in the distribution ratio of the cooling water, the cooling effect has also been significantly improved.

[0048] As Figure 5As shown, during the entire cooling process of this embodiment, the cooling water from the outside enters the water inlet channel through the water inlet, and enters the water inlet buffer cavity through a number of first through holes and the water inlet extension pipe. After the cooling water in the buffer cavity accumulates to a certain extent, that is, when the cooling water reaches the position of the water through holes on the orifice plate, the cooling water will enter the roll body water cooling cavity through the water through holes on the orifice plate, and then the cooling water will then enter the water outlet buffer cavity.

[0049] Specifically, since the water inlet buffer cavity and the water outlet buffer cavity are arranged between the water inlet / outlet channels and the inner roller, they have a certain volume. Therefore, both the water inlet buffer cavity and the water outlet buffer cavity can accommodate a certain volume of cooling water. When the cooling water enters the water inlet buffer cavity through the water inlet extension pipe, the cooling water will first accumulate in the water inlet buffer cavity. Since the density of air is smaller than that of water, this makes the air and the cooling water present an up-and-down position relationship in the water inlet buffer cavity, that is, the air is on top and the water is at the bottom. And the air and the cooling water also enter the roll body water cooling cavity through the orifice plate in the above-mentioned up-and-down distribution. The cooling water then enters the water outlet buffer cavity from the roll body water cooling cavity. Since the water inlet end of the water outlet extension pipe is distributed near the top of the water outlet buffer cavity, and the density of air is small, the cooling water will also accumulate in the water outlet buffer cavity at the beginning, and the air floats on the upper side of the water outlet buffer cavity, that is, above the water. At this time, the air will first enter the water outlet extension pipe and be discharged in the water outlet extension pipe, and then the cold water will be discharged. In this process, the air is discharged from the inside of the roll to the greatest extent, so that the cooling water and the air are perfectly separated, effectively alleviating the problem of uneven distribution of the rotating mass of the roll. At the same time, due to the increase in the distribution ratio of the cooling water, the cooling effect has also been significantly improved.

[0050] Embodiment 2

[0051] The purpose of this embodiment is to provide a lightweight water-cooled roll body with a self-exhaust air function and a cooling method. To achieve the above purpose, one or more embodiments of the present invention provide the following technical solutions:

[0052] (1), The external cooling water enters the water inlet channel through the water inlet, and flows into the water inlet buffer cavity through a number of first through holes and the water inlet extension pipe;

[0053] (2), The cooling water will accumulate in the water inlet buffer cavity, and when it accumulates to a certain extent, it will enter the roll body water cooling cavity along the water through holes to cool the roll body;

[0054] (3) The cooling water enters the water outlet buffer cavity through the roll body water cooling cavity, and a certain amount of water will accumulate in the water outlet buffer cavity for a period of time. When the amount of cooling water in the water outlet buffer cavity accumulates to a certain extent, it can flow into the water outlet channel through the water outlet extension pipe and the second through holes;

[0055] (4) The cooling liquid in the water outlet channel flows from the water outlet to the outside.

[0056] Although the specific implementation manners of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A lightweight water-cooled roller body with self-air exhausting function, characterized in that, It includes an inner roller and an outer roller. Both the inner roller and the outer roller are hollow cylinders. The outer roller is coaxially sleeved outside the inner roller, and an upper cylinder cover and a lower cylinder cover are respectively arranged on both sides of the outer roller. The outer roller includes a water inlet channel, a water outlet channel and an extension pipe. An unpenetrated water inlet channel and a water outlet channel are respectively opened on the left and right sides along the radial center of the inner roller. The water inlet channel is coaxially sleeved at the shaft center inside the upper cylinder cover, and the water outlet channel is coaxially sleeved at the shaft center inside the lower cylinder cover. A roller body water cooling cavity is formed between the inner roller and the outer roller. Orifice plates are arranged on both sides of the inner roller and the roller body water cooling cavity. Water passing holes are arranged on the orifice plates. A buffer cavity is formed between the outer roller and the orifice plate. The buffer cavity is communicated with the roller body water cooling cavity through the water passing holes. Both the water inlet channel and the water outlet channel are communicated with the buffer cavity through the extension pipe. The extension pipe extends to the top of the buffer cavity.

2. The lightweight water-cooled roll body with self-air exhausting function according to claim 1, characterized in that, The inner roller is a hollow structure and does not fill any substances inside. The length of the roller body water cooling cavity is the same as that of the inner roller.

3. The lightweight water-cooled roller body with self-air exhausting function according to claim 1, characterized in that, The number of the water passing holes is several and the openings are small. They are evenly distributed along the circumferential side of the inner roller. The water passing holes and the roller body water cooling cavity are horizontally distributed on the left and right.

4. A lightweight water-cooled roller body with self-air exhausting function according to claim 1, characterized in that, The water inlet channel is communicated with the outside through a water inlet, and the water outlet channel is communicated with the outside through a water outlet.

5. The lightweight water-cooled roller body with self-air exhausting function according to claim 1, characterized in that The water inlet channel is provided with a number of first through holes, and the number of the first through holes is several. They are sequentially annularly distributed along the circumferential side of the water inlet channel from left to right.

6. A lightweight water-cooled roller body with self-air exhausting function according to claim 1, characterized in that, The water outlet channel is provided with a number of second through holes, and the number of the second through holes is several. They are sequentially annularly distributed along the circumferential side of the water outlet channel from left to right.

7. The lightweight water-cooled roll body with self-air exhausting function according to claim 1, characterized in that, The extension pipe includes a water inlet extension pipe and a water outlet extension pipe. The number of the water inlet extension pipes is the same as that of the first through holes and the positions correspond one by one. The water inlet extension pipe is connected with the water inlet channel through the first through hole. The water inlet extension pipe and the water inlet pipeline are vertically distributed at 90 degrees.

8. A lightweight water-cooled roller body with a self-exhaust air function as described in claim 7, characterized in that, The number of the water outlet extension pipes is the same as that of the second through holes and the positions correspond one by one. The water outlet extension pipe and the water outlet channel are vertically connected at 90 degrees.

9. The lightweight water-cooled roller body with self-air exhausting function according to claim 1, characterized in that, The buffer cavity is divided into a water inlet buffer cavity and a water outlet buffer cavity. The water inlet buffer cavity is located on the left side of the inner roller and is connected with the water inlet channel through the water inlet extension pipe. The water outlet buffer cavity is located on the right side of the inner roller. The water outlet buffer cavity is connected with the water outlet channel through the water outlet extension pipe. The water outlet end of the water inlet extension pipe is close to the top of the water inlet buffer cavity. The water inlet end of the water outlet extension pipe is close to the top of the water outlet buffer cavity. The water inlet end of the water outlet extension pipe and the water outlet end of the water inlet extension pipe are horizontally distributed with the water passing holes.

10. A cooling method, based on a lightweight water-cooled roll body with an automatic air exhaust function according to any one of claims 1-9, characterized in that, It includes the following steps: (1). The external cooling water enters the water inlet channel from the water inlet, and flows into the water inlet buffer cavity through a number of first through holes and the water inlet extension pipe. (2). The cooling water will accumulate in the water inlet buffer cavity. After accumulating to a certain extent, it will enter the roller body water cooling cavity along the water passing holes to cool the roller body. (3). The cooling water enters the water outlet buffer cavity through the roller body water cooling cavity, and a certain amount of water will accumulate in the water outlet buffer cavity for a period of time. After the cooling water volume in the water outlet buffer cavity accumulates to a certain extent, it can flow into the water outlet channel through the water outlet extension pipe and the second through holes. (4). The cooling liquid in the water outlet channel flows to the outside from the water outlet.

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