Roller structure of PE coating machine

Abstract

The invention relates to the technical field of coating machine rollers, in particular to a PE coating machine roller structure which comprises a coating roller and further comprises a heating cylinder, a heating sealing plate assembly, a partition plate, a third electromagnetic valve, a backflow sealing plate assembly and a liquid guiding assembly. A heating cavity and a backflow cavity which are located on the two sides of the partition plate are formed in the heating cylinder, the third electromagnetic valve is installed in the center of the partition plate, and the two heating sealing plate assemblies are symmetrically installed in the heating cavity relative to the third electromagnetic valve and are both in sliding fit with the partition plate and the heating cylinder. According to the invention, the heat exchange liquid introduction pressure is adjusted according to the coating width of the PE film, the distance between the heating sealing plate assemblies is adaptively changed, and the heat dissipation area of the coating roller is reduced, so that the problems of energy waste and poor coating quality of the PE film caused by temperature difference on the surface of the coating roller when the widths of the coated PE films are different are solved.

Description

Technical Field

[0001] The invention relates to the technical field of coating machine rollers, in particular to a PE coating machine roller structure. Background Art

[0002] A PE coater is a machine specifically designed to apply polyethylene (PE) protective film to various substrates. It is widely used in industries such as packaging, electronics, optics, hardware, building materials, furniture, and automotive, providing surface protection for products and preventing damage during manufacturing, transportation, and use. The coating process involves the PE film passing over a coating roller, which evenly coats the substrate surface. The roller is typically made of high-quality rubber to ensure a uniform and detailed coating.

[0003] The melting point of PE is above 100℃. When molten PE comes into contact with a low-temperature coating roller, if the temperature difference between the coating roller and PE is too large, the PE film formed by coating will become brittle. Therefore, when producing PE film coating, the temperature of the PE coating roller needs to be controlled between 50℃ and 80℃.

[0004] When the width of the coated PE film is narrow, the width of the PE coating roller that is not in contact with the PE raw material is large. At this time, the heat dissipation area on the surface of the PE coating roller is large, resulting in energy waste; and when the width of the coated PE film is wide, the heat dissipation at the end of the coating roller is much higher than that in the middle position, resulting in a large temperature difference on the surface of the coating roller, resulting in poor quality of the processed PE film.

[0005] Therefore, a PE coating machine roller structure is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a PE coating machine roller structure, which solves the problems of energy waste when the width of the coated PE film is different and poor PE film coating quality due to temperature difference on the surface of the coating roller by adjusting the heat exchange fluid supply pressure according to the coating width of the PE film, adaptively changing the spacing of the heating sealing plate components, and reducing the heat dissipation area of ​​the coating roller. The structure has the effect of reducing the heat dissipation area of ​​the coating roller according to the coating width of the PE film when heating the coating roller, thereby reducing energy waste and reducing the temperature difference on the surface of the coating roller, thereby ensuring the coating quality of the PE film.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A PE coating machine roller structure includes a coating roller, a heating cylinder, a heating sealing plate assembly, a partition, a third solenoid valve, a reflux sealing plate assembly and a liquid guide assembly. The heating cylinder is in rolling contact with the inner circumference of the coating roller, and the partition is fitted on the inner circumference of the heating cylinder. The heating cylinder is provided with a heating chamber and a reflux chamber on both sides of the partition. The third solenoid valve is installed at the center of the partition. The two heating sealing plate assemblies are symmetrically installed in the heating chamber about the third solenoid valve, and the two heating sealing plate assemblies are in sliding contact with the partition and the heating cylinder. The two reflux sealing plate assemblies are symmetrically installed in the reflux chamber about the third solenoid valve, and the two reflux sealing plate assemblies are slidably fitted with the partition and the heating cylinder, the four liquid guide assemblies all pass through the end of the heating cylinder, the heating sealing plate assembly and the reflux sealing plate assembly are connected to the liquid guide assembly, when the heat exchange liquid pressure in the heating chamber and the reflux chamber is constant, the heating sealing plate assembly and the reflux sealing plate assembly slide along the inner circumference of the partition and the heating cylinder to the set position, and the spacing between the heating sealing plate assemblies and the spacing between the reflux sealing plate assemblies are positively correlated with the heat exchange liquid pressure.

[0009] As mentioned above, when the heating temperature of the heat exchange liquid is constant, the inlet pressure of the heat exchange liquid is adjusted and changed according to the coating width of the PE film. Since the flow cross-sectional area of ​​the heat exchange chamber and the reflux chamber is constant, the heat exchange liquid flow rate per unit time changes accordingly, thereby causing the volume of the heating chamber and the reflux chamber to change accordingly, while the heat exchange liquid discharge efficiency is fixed. Therefore, the pressure inside the heating chamber changes until the heating sealing plate assembly is displaced, until the pressure inside the heating chamber is consistent with the initial pressure, thereby causing the distance between the two heating sealing plate assemblies to change accordingly, so that the heat of the heat exchange liquid is concentrated at the length value and the PE film. In the heating chamber with equal coating width values, the heat utilization rate is high, which can greatly reduce energy waste; in addition, the heat exchange fluid enters the heating chamber from both sides of the heating chamber, thereby reducing energy waste during the heat exchange fluid transmission process, further improving energy utilization, and fully reducing the temperature difference within the coating width range of the coating roller, fully ensuring the coating quality of the PE film; in addition, when the PE film coating width is large, the heat dissipation part of the coating roller is the contact part with the heating chamber, so the heat dissipation area is also greatly reduced, so that energy waste can be effectively reduced when coating PE films of different widths.

[0010] Preferably, the inner circumference of the coating roller is structured with a columnar groove, and a copper heat exchange cylinder is fitted in the columnar groove, and the inner circumference of the copper heat exchange cylinder is rollingly fitted with the outer circumference of the heating cylinder.

[0011] As described above, under the action of the copper heat exchange cylinder, the heat exchange effect of the heat exchange fluid passing through the heating cylinder and the coating roller can be effectively improved. In addition, the friction resistance between the heating cylinder and the coating roller can be effectively reduced, ensuring that the coating roller rotates smoothly on the outer periphery of the heating cylinder.

[0012] Preferably, the heating sealing plate assembly includes an insulation plate, a first solenoid valve and a first sealing strip. The insulation plate slides between the inner side of the partition and the inner periphery of the heating cylinder. The first solenoid valve is installed on the insulation plate, and the first sealing strip is installed on the outer periphery of the insulation plate.

[0013] As described above, the heat insulation board is fitted with the partition board and the inner circumference of the heating cylinder through the first sealing strip, which not only effectively ensures the sealing of the heating chamber, but also allows the length of the heating chamber to change accordingly with the spacing between the heat insulation boards.

[0014] Preferably, the reflux sealing plate assembly includes a side baffle, a second solenoid valve and a second sealing strip. The side baffle is slidably installed between the outer side of the partition and the inner periphery of the heating cylinder. The second solenoid valve is installed on the side wall of the side baffle, and the second sealing strip is installed on the outer periphery of the side baffle.

[0015] As described above, the identical design of the side baffles and the heat insulation plates enables the distance between the side baffles to be adaptively changed, thereby adapting to changes in the inlet pressure of the heat exchange fluid.

[0016] Preferably, the liquid guide assembly includes an elliptical tube, a delivery tube and a corrugated telescopic tube, the end of the elliptical tube extends to the inner side of the heating cylinder, the delivery tube is connected to the end of the elliptical tube, the corrugated telescopic tube is connected to the end of the delivery tube, and the end of the corrugated telescopic tube is in contact with the side wall of the insulation board or the side baffle, and the first solenoid valve and the second solenoid valve are both located on the inner side of the end of the corrugated telescopic tube.

[0017] As described above, the length of the bellows can be adaptively expanded and contracted according to the position change of the heat insulation plate and the side baffle, thereby ensuring that the heat exchange fluid can smoothly flow into the heating chamber and smoothly flow out of the reflux chamber.

[0018] Preferably, a conical seat is installed on the inner circumference of the coating roller, and protective tubes located outside the elliptical tube are installed at both ends of the heating cylinder, and the protective tubes are located inside the conical seat.

[0019] As described above, under the action of the conical seat and the protective tube, the power input is connected to the conical seat with a larger diameter, and the end of the elliptical tube passes through the end of the protective tube and is not affected by the rotation of the coating roller.

[0020] Preferably, the partition is configured as a hollow structure, and the end portion of the partition is configured as an arc.

[0021] As described above, the hollow structure of the partition significantly reduces the amount of heat lost to the return chamber by heat conduction after the heat exchange fluid enters the heating chamber, thereby further improving energy utilization.

[0022] Preferably, a first arc strip and a second arc strip with opposite rotation directions are fitted between the inner periphery of the partition and the inner periphery of the heating cylinder, and the first arc strip and the second arc strip are symmetrically arranged with respect to the third solenoid valve.

[0023] As described above, under the action of the first arc strip and the second arc strip, the heat exchange fluid flowing into the heat exchange chamber from the end of the corrugated expansion tube can flow smoothly to the center of the heating chamber, and can be guided to enter the reflux chamber from the position of the third solenoid valve.

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

[0025] 1. When the width of the PE film to be coated is different, the present invention does not need to change the heating temperature of the heat exchange liquid. It only needs to change the pumping pressure of the heat exchange liquid accordingly. The pressure change of the heat exchange liquid entering the heating chamber can be used to adaptively adjust the width of the heating chamber, and the circulation position of the heat exchange liquid can be fully overlapped with the coating position of the PE film. The heat exchange position between the heat exchange liquid and the coating roller is concentrated at the contact point between the PE film and the coating roller, which greatly improves the energy utilization rate and effectively reduces the surface temperature difference of the coating roller when coating PE films of different widths, effectively ensuring the coating quality of the PE film.

[0026] 2. Through the setting of the heating sealing plate assembly and the heating chamber, the heat exchange liquid enters the heating chamber from both ends of the heating chamber. By reducing the flow stroke of the heat exchange liquid, the temperature change range of the heat exchange liquid after entering the heating chamber can be narrowed, thereby making the temperature of the coating roller within the PE film coating width range tend to be consistent, thereby effectively ensuring the coating quality of the PE film.

[0027] 3. The copper heat exchange cylinder can effectively improve the heat exchange effect of the heat exchange fluid passing through the heating cylinder and the coating roller. In addition, it can effectively reduce the friction resistance between the heating cylinder and the coating roller, ensuring that the coating roller rotates smoothly on the outer periphery of the heating cylinder. Combined with the hollow structure of the partition, it can reduce the heat loss of the heat exchange fluid after entering the heating chamber, further improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0030] Figure 3 Schematic diagram of the cross-sectional structure of the coating roller of the present invention;

[0031] Figure 4 Schematic diagram of the cross-sectional structure of the heating tube of the present invention;

[0032] Figure 5 Schematic diagram of the partition structure of the present invention;

[0033] Figure 6 Schematic diagram of the structure of the liquid guide assembly of the present invention;

[0034] Figure 7 This is a schematic structural diagram of the heating sealing plate assembly of the present invention;

[0035] Figure 8 It is a schematic structural diagram of the reflux sealing plate assembly of the present invention.

[0036] In the figure: 1. Coating roller; 11. Copper heat exchange cylinder; 2. Heating cylinder; 21. Heating chamber; 22. Reflux chamber; 3. Heating sealing plate assembly; 31. Heat insulation plate; 32. First solenoid valve; 33. First sealing strip; 4. Partition; 41. First arc strip; 42. Second arc strip; 5. Third solenoid valve; 6. Reflux sealing plate assembly; 61. Side baffle; 62. Second solenoid valve; 63. Second sealing strip; 7. Conical seat; 8. Protective tube; 9. Liquid guide assembly; 91. Elliptical tube; 92. Delivery pipe; 93. Corrugated expansion pipe. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figures 1 to 8 The present invention provides a PE coating machine roller structure, and the technical solution is as follows:

[0039] Reference Figure 1 、 Figure 2 and Figure 4, a PE coating machine roller structure, including a coating roller 1, also including a heating cylinder 2, a heating sealing plate assembly 3, a partition 4, a third solenoid valve 5, a reflux sealing plate assembly 6 and a liquid guide assembly 9. The heating cylinder 2 is in rolling contact with the inner circumference of the coating roller 1, and the coating roller 1 is made of rubber material. The partition 4 is fitted on the inner circumference of the heating cylinder 2, and the two ends of the partition 4 are fixed to the inner end of the heating cylinder 2. The interior of the heating cylinder 2 is provided with a heating chamber 21 and a reflux chamber 22 located on both sides of the partition 4. The third solenoid valve 5 is installed at the center of the partition 4. After the heat exchange liquid enters the heating chamber 21 from both ends, it fully exchanges heat with the coating roller 1 and then enters the reflux chamber 22 through the third solenoid valve 5. The two heating sealing plate assemblies 3 are symmetrically installed in the heating chamber 21 with respect to the third solenoid valve 5, and the two heating sealing plate assemblies 3 are slidably fitted with the partition 4 and the heating cylinder 2. The two reflux sealing plate assemblies 6 are symmetrically installed in the reflux chamber 22 with respect to the third solenoid valve 5, and the two reflux sealing plates The components 6 are all slidingly fitted with the partition 4 and the heating tube 2, and the four liquid guiding components 9 all pass through the end of the heating tube 2. The heating sealing plate component 3 and the reflux sealing plate component 6 are all connected to the liquid guiding component 9, and each heating sealing plate component 3 and the reflux sealing plate component 6 are connected to a single liquid guiding component 9. The spacing value of the two heating sealing plate components 3 is equal to the length value of the heating chamber 21. When the heat exchange liquid pressure in the heating chamber 21 and the reflux chamber 22 is constant, the heating sealing plate component 3 and the reflux sealing plate component 6 slide along the partition 4 and the inner periphery of the heating tube 2 to the set position. When the heating temperature of the heat exchange liquid remains unchanged and the PE film coating width changes, the pumping pressure of the heat exchange liquid in the liquid guiding component 9 connected to the heating sealing plate component 3 is adjusted accordingly. When the pumping pressure changes, the heating sealing plate component 3 is automatically expanded, so that the length value of the heating chamber 21 is equal to the PE film coating width, and the spacing of the heating sealing plate components 3 and the spacing of the reflux sealing plate components 6 are positively correlated with the heat exchange liquid pressure.

[0040] Reference Figure 3 As an embodiment of the present invention, specifically, the inner circumference of the coating roller 1 is constructed with a columnar groove, and a copper heat exchange cylinder 11 is fitted in the columnar groove. The inner circumference of the copper heat exchange cylinder 11 is rollingly fitted with the outer circumference of the heating cylinder 2. The diameter of the columnar groove is equal to the diameter of the outer circumference of the heating cylinder 2. The heating cylinder 2 exchanges heat with the coating roller 1 through the copper heat exchange cylinder 11, effectively improving the heat exchange effect of the heat exchange fluid passing through the heating cylinder 2 and the coating roller 1, and reducing the friction resistance between the heating cylinder 2 and the coating roller 1.

[0041] Reference Figure 4 and Figure 7As an embodiment of the present invention, specifically, the heating sealing plate assembly 3 includes an insulation plate 31, a first solenoid valve 32 and a first sealing strip 33. The insulation plate 31 is slidably fitted between the inner side of the partition 4 and the inner periphery of the heating cylinder 2. The first solenoid valve 32 is installed on the insulation plate 31, and the first sealing strip 33 is installed on the outer periphery of the insulation plate 31. The insulation plate 31 is fitted with the partition 4 and the inner periphery of the heating cylinder 2 through the first sealing strip 33 to ensure the sealing of the heating chamber 21. At the same time, the insulation plate 31 can slide horizontally in the heating cylinder 2, thereby changing the volume of the heating chamber 21. When the pump-out pressure increases, the distance between the two insulation plates 31 becomes larger, so that the length of the heating chamber 21 is equal to the width of the PE film coating. Otherwise, the distance between the insulation plates 31 becomes smaller.

[0042] Reference Figure 2 and Figure 8 As an embodiment of the present invention, specifically, the reflux sealing plate assembly 6 includes a side baffle 61, a second solenoid valve 62 and a second sealing strip 63. The side baffle 61 is slidably installed between the outer side of the partition 4 and the inner periphery of the heating tube 2. The second solenoid valve 62 is installed on the side wall of the side baffle 61. The second sealing strip 63 is installed on the outer periphery of the side baffle 61. When the pumping pressure changes, the volume of the reflux chamber 22 also changes, so the length value of the reflux chamber 22 also changes adaptively.

[0043] Reference Figure 4 and Figure 6 As an embodiment of the present invention, specifically, the liquid guide component 9 includes an elliptical tube 91, a delivery tube 92 and a bellows telescopic tube 93. The end of the elliptical tube 91 extends to the inner side of the heating tube 2, the delivery tube 92 is connected to the end of the elliptical tube 91, and the bellows telescopic tube 93 is connected to the end of the delivery tube 92. The end of the bellows telescopic tube 93 is in contact with the side wall of the insulation board 31 or the side baffle 61. The pumped heat exchange liquid enters the heating chamber 21 through the bellows telescopic tube 93 connected to the insulation board 31. The heat exchange liquid after heat exchange flows out through the bellows telescopic tube 93 connected to the side baffle 61. The first solenoid valve 32 and the second solenoid valve 62 are both located on the inner side of the end of the bellows telescopic tube 93.

[0044] Reference Figure 1 and Figure 2 As an embodiment of the present invention, specifically, a conical seat 7 is installed on the inner circumference of the coating roller 1, and protective tubes 8 located on the outside of the elliptical tube 91 are installed at both ends of the heating tube 2, and the protective tubes 8 are located on the inside of the conical seat 7. The power input is connected to the conical seat 7, so that the coating roller 1 maintains relative rotation with the heating tube 2 through the copper heat exchange tube 11.

[0045] Reference Figure 5As an embodiment of the present invention, specifically, the partition 4 is set to a hollow structure, and the heat lost to the reflux chamber 22 through heat conduction is greatly reduced, and the end of the partition 4 is constructed into an arc shape. The first arc strip 41 and the second arc strip 42 with opposite rotation directions are fitted between the inner periphery of the partition 4 and the inner periphery of the heating tube 2, and the first arc strip 41 and the second arc strip 42 are symmetrically arranged about the third solenoid valve 5. The first arc strip 41 and the second arc strip 42 can reduce the dead angle of the heat exchange liquid in the heating chamber 21 and guide the heat exchange liquid into the reflux chamber 22 from the position of the third solenoid valve 5.

[0046] Working principle: The power input device drives the coating roller 1 to rotate through the conical seat 7. When the PE film coating width changes, the pumping pressure of the heat exchange liquid is adjusted accordingly without changing the heating temperature of the heat exchange liquid (only the speed of the booster pump needs to be changed accordingly). When the heat exchange liquid pumping pressure changes, the heat exchange liquid enters the heating chamber 21 through the corresponding liquid guide component 9 and the heating sealing plate component 3. The heat exchange liquid pumping pressure reacts on the insulation plate 31, so that the distance between the two insulation plates 31 changes adaptively until the length of the heating chamber 21 is equal to the PE film coating width. This can not only effectively reduce the heat dissipation area of ​​the coating roller 1 and reduce energy loss, but also concentrate heat to maintain the contact part between the coating roller 1 and the PE raw material, thereby improving energy utilization. In combination with the introduction of heat exchange liquid into the heating chamber 21 from both ends, the temperature difference of the coating part of the coating roller 1 can be effectively reduced.

[0047] Specifically, the heat exchange fluid is acted upon by a booster pump with adjustable pumping pressure. The pumping pressure of the booster pump is positively correlated with the speed of its driving motor. The corresponding pumping pressure value is calculated according to the coating width of the PE film, and the speed value of the driving motor is calculated. Subsequently, the driving motor is controlled at an appropriate speed by the speed regulator, so that the booster pump continuously pumps the heat exchange fluid at a constant pressure. Under the action of the booster pump, the heat exchange fluid passes through the elliptical tube 91, the delivery pipe 92 and the corrugated delivery pipe 92 on both sides of the heating chamber 21 in turn, and then enters the heating chamber 21 through the first solenoid valve 32. The first curved bar 41 and the second curved bar 42 guide the heat exchange fluid to flow to the third solenoid valve 5. When the pumping pressure is increased, after the heat exchange fluid fills the heating chamber 21, the pumping pressure of the heat exchange fluid reacts on the heat insulation plate 31. , causing the two insulation boards 31 to move simultaneously, thereby increasing the length of the heating chamber 21 until the length of the heating chamber 21 is consistent with the width of the PE film coating; when it is necessary to reduce the pump pressure, close the first solenoid valve 32 and open the second solenoid valve 62 and the third solenoid valve 5, use a vacuum pump to connect the elliptical tubes 91 on both sides of the reflux chamber 22, and use the vacuum pump to extract the air in the reflux chamber 22 and the heating chamber 21, so that the pressure in the heating chamber 21 is reduced. When the pressure is reduced, the two insulation boards 31 move horizontally along the partition 4 and the inner periphery of the heating cylinder 2 at the same time until the distance between the insulation boards 31 is reduced. When the heat exchange fluid of the corresponding pressure is subsequently introduced into the heating chamber 21, the heat exchange fluid pump pressure reacts on the insulation boards 31, and the insulation boards 31 are adjusted to the appropriate spacing position again;

[0048] The heat exchange fluid entering the heating chamber 21 exchanges heat with the coating roller 1 through the heating cylinder 2 and the copper heat exchange cylinder 11. The heating portion of the coating roller 1 is located in front of the contact portion between the coating roller 1 and the PE raw material. When the coating roller 1 is heated, it contacts the PE raw material, thereby ensuring that the temperature of the contact portion between the PE raw material and the coating roller 1 remains within a relatively small range.

[0049] The heat exchange fluid after heat exchange flows into the reflux chamber 22 through the third solenoid valve 5 , and passes through the side baffle 61 , the bellows expansion pipe 93 , the delivery pipe 92 and the elliptical pipe 91 in sequence before flowing out of the heating cylinder 2 .

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A PE coating machine roller structure, comprising a coating roller (1), characterized in that: It also includes a heating cylinder (2), a heating sealing plate assembly (3), a partition (4), a third solenoid valve (5), a reflux sealing plate assembly (6) and a liquid guide assembly (9), wherein the heating cylinder (2) is in rolling contact with the inner periphery of the coating roller (1), the partition (4) is fitted on the inner periphery of the heating cylinder (2), the heating cylinder (2) is provided with a heating chamber (21) and a reflux chamber (22) located on both sides of the partition (4), the third solenoid valve (5) is installed at the center of the partition (4), the two heating sealing plate assemblies (3) are symmetrically installed in the heating chamber (21) with respect to the third solenoid valve (5), and the two heating sealing plate assemblies (3) are both in sliding contact with the partition (4) and the heating cylinder (2), and the two The reflux sealing plate assembly (6) is symmetrically installed in the reflux chamber (22) with respect to the third solenoid valve (5), and the two reflux sealing plate assemblies (6) are slidably fitted with the partition (4) and the heating tube (2), the four liquid guide assemblies (9) are all passed through the end of the heating tube (2), the heating sealing plate assembly (3) and the reflux sealing plate assembly (6) are both connected to the liquid guide assembly (9), and when the heat exchange liquid pressure in the heating chamber (21) and the reflux chamber (22) is constant, the heating sealing plate assembly (3) and the reflux sealing plate assembly (6) slide along the inner periphery of the partition (4) and the heating tube (2) to a set position, and the spacing of the heating sealing plate assembly (3) and the spacing of the reflux sealing plate assembly (6) are both positively correlated with the heat exchange liquid pressure.

2. The roller structure of a PE coating machine according to claim 1, characterized in that: The inner periphery of the coating roller (1) is structured with a columnar groove, and a copper heat exchange cylinder (11) is fitted in the columnar groove. The inner periphery of the copper heat exchange cylinder (11) is rolling-fitted with the outer periphery of the heating cylinder (2).

3. The roller structure of a PE coating machine according to claim 2, characterized in that: The heating sealing plate assembly (3) comprises a heat insulation plate (31), a first solenoid valve (32) and a first sealing strip (33); the heat insulation plate (31) is slidably fitted between the inner side of the partition (4) and the inner periphery of the heating cylinder (2); the first solenoid valve (32) is mounted on the heat insulation plate (31); and the first sealing strip (33) is mounted on the outer periphery of the heat insulation plate (31).

4. The roller structure of a PE coating machine according to claim 3, characterized in that: The reflux sealing plate assembly (6) comprises a side baffle (61), a second solenoid valve (62) and a second sealing strip (63); the side baffle (61) is slidably mounted between the outer side of the partition (4) and the inner periphery of the heating cylinder (2); the second solenoid valve (62) is mounted on the side wall of the side baffle (61); and the second sealing strip (63) is mounted on the outer periphery of the side baffle (61).

5. The roller structure of a PE coating machine according to claim 4, characterized in that: The liquid guide assembly (9) comprises an elliptical tube (91), a delivery tube (92) and a bellows telescopic tube (93); the end of the elliptical tube (91) extends to the inner side of the heating cylinder (2); the delivery tube (92) is connected to the end of the elliptical tube (91); the bellows telescopic tube (93) is connected to the end of the delivery tube (92); and the end of the bellows telescopic tube (93) is in contact with the side wall of the heat insulation board (31) or the side baffle (61).

6. The roller structure of a PE coating machine according to claim 5, characterized in that: A conical seat (7) is installed on the inner periphery of the coating roller (1), and protective tubes (8) located outside the elliptical tube (91) are installed at both ends of the heating cylinder (2), and the protective tubes (8) are located inside the conical seat (7).

7. The roller structure of a PE coating machine according to claim 1, characterized in that: The partition (4) is configured as a hollow structure, and the end of the partition (4) is configured as an arc.

8. The roller structure of a PE coating machine according to claim 7, characterized in that: A first arc strip (41) and a second arc strip (42) with opposite rotation directions are fitted between the inner periphery of the partition (4) and the inner periphery of the heating cylinder (2), and the first arc strip (41) and the second arc strip (42) are symmetrically arranged with respect to the third solenoid valve (5).

9. The roller structure of a PE coating machine according to claim 5, characterized in that: The first solenoid valve (32) and the second solenoid valve (62) are both located inside the end of the bellows expansion tube (93).

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