A coating machine and an air floatation roller assembly thereof

Abstract

The application provides a coating machine and an air float roller assembly thereof. The air float roller comprises a roller body and a fan blade. The roller body has a peripheral wall, and the peripheral wall is provided with an air outlet extending along the axial direction of the roller body. The interior of the roller body is provided with a cavity extending along the axial direction, and the air outlet is communicated with the cavity. The fan blade is arranged at the air outlet and is distributed along the axial direction of the roller body. The fan blade is provided with a groove extending along the axial direction of the roller body, and the opening of the groove faces the inner side of the cavity. The air float roller assembly comprises a plurality of air float rollers. The coating machine comprises the air float roller. The coating machine and the air float roller assembly thereof can spray large and uniform airflow, so that the pole piece is stably suspended on the air float roller, the integrity of the coating on the pole piece is protected, the quality and the yield of the pole piece are improved, and the performance of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery, in particular to a coating machine and a gas bearing roller assembly thereof. BACKGROUND

[0002] In the technical field of lithium battery, the pole piece is coated by aluminum foil or copper foil. In the double-sided coating process, the aluminum foil or copper foil on one side has been coated with slurry, so the general roller cannot be used for support to prevent the slurry on the pole piece from contacting the roller body and affecting the quality of the pole piece coating.

[0003] In the related art, the gas bearing roller sprays gas to achieve the required suspension support of the pole piece. Generally, an external air blower is used to supply air. The air flow enters the gas bearing roller from the axial end of the gas bearing roller. The air pressure in the middle of the gas bearing roller is high and the air flow speed is fast, while the air pressure at the end is low and the air flow speed is slow. The turbulent air flow flowing out easily causes uneven stress on the pole piece in suspension, or an external air blower is used to supply air, and the air flow enters from the bottom of the gas bearing roller. However, the sprayed air flow is also uneven, the air pressure is low, and the air flow is small, which affects the coating quality of the pole piece and the stability of the suspension. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a gas bearing roller which can balance the uneven air pressure and spray uniform and large flow air flow to make the pole piece more stably suspended.

[0005] The present application also provides a gas bearing roller assembly having the above-mentioned gas bearing roller.

[0006] The present application also provides a coating machine having the above-mentioned gas bearing roller.

[0007] According to the first aspect of the present application, the gas bearing roller comprises,

[0008] a roller body having a peripheral wall, the peripheral wall being provided with an air outlet extending along the axial direction of the roller body, the roller body being provided with a cavity extending along the axial direction, the air outlet being in communication with the cavity;

[0009] a fan blade provided at the air outlet, the fan blade being arranged along the axial direction of the roller body, the fan blade having a groove extending along the axial direction of the roller body, the opening of the groove facing the inner side of the cavity.

[0010] According to some embodiments of the present application, the number of fan blades is multiple, and the multiple fan blades are arranged at the air outlet in a spaced manner perpendicular to the axial direction of the gas bearing roller.

[0011] According to some embodiments of the present application, the fan blade comprises a wing-shaped member and an L-shaped baffle, the wing-shaped member being connected to one side of the L-shaped baffle to form the groove;

[0012] The airfoil has a first curved surface close to the groove and a second curved surface away from the groove, the first curved surface is concave to one side of the groove, and the second curved surface is convex to the other side of the groove.

[0013] According to some embodiments of the present application, the curvature of the first curved surface is greater than the curvature of the second curved surface.

[0014] According to some embodiments of the present application, the side of the airfoil away from the groove is connected to the face of the L-shaped baffle, the side includes a flat face connected to the arc face at one end and connected to the second curved surface at the other end.

[0015] According to some embodiments of the present application, the end of the roller body in the axial direction is provided with a butterfly adjustment member connected to the fan blade, and rotating the butterfly adjustment member can rotate the fan blade in a direction perpendicular to the axial direction of the roller body.

[0016] According to some embodiments of the present application, the inside of the roller body is provided with a flow uniformizing plate, the flow uniformizing plate and the side of the roller body close to the air outlet form a first cavity, and the flow uniformizing plate is provided with a plurality of openings spaced along the axial direction of the roller body, and the airflow can enter the first cavity through the plurality of openings.

[0017] According to some embodiments of the present application, the air floating roller is provided with an air inlet close to the peripheral wall of the second cavity, the number of air inlets is multiple, and the multiple air inlets are sequentially and spaced along the axial direction of the air floating roller.

[0018] The flow uniformizing plate and the side of the roller body away from the first cavity form a second cavity, the second cavity is provided with a cross-flow fan inside, the cross-flow fan is distributed along the axial direction of the roller body, and the cross-flow fan can suck the airflow from the multiple air inlets and flow out through the air outlet.

[0019] The combination air floating roller according to the second aspect of the embodiments of the present application comprises a plurality of air floating rollers according to the first aspect of the embodiments of the present application, and the multiple air floating rollers are sequentially and spaced in a direction perpendicular to the axial direction of the air floating roller.

[0020] The coating machine according to the third aspect of the embodiments of the present application comprises a plurality of air floating rollers according to the first aspect of the embodiments of the present application.

[0021] The air floating roller according to the embodiments of the present application has at least the following beneficial effects:

[0022] The air outlet of the roller body of the air floating roller is provided with a fan blade, and the opening of the groove on the fan blade faces the cavity. Before the airflow in the cavity flows out of the air outlet, it will first flow through the groove of the fan blade. The negative pressure area is formed due to the obstruction of the groove to the airflow, the airflow flows to both sides along the axial direction of the roller body at the groove, and accumulates, the airflow flow tends to be uniform, and the air pressure gradually increases. Due to the wall attachment characteristics of the fluid itself, the large-flow airflow gradually flows out of the air outlet along the surface of the groove and the fan blade. The pole piece is stably suspended on the air floating roller. The integrity of the coating on the pole piece can be protected, the quality and yield of the pole piece can be improved, and the performance of the battery can be improved.

[0023] Additional aspects and advantages of the present application will be set forth in part in the following description, will become apparent from the following description, or will be learned through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings and examples, wherein:

[0025] Figure 1 A schematic view of an air floating roller and a pole piece according to an embodiment of the present application;

[0026] Figure 2 A schematic view of an air floating roller according to an embodiment of the present application;

[0027] Figure 3 A schematic view of an air floating roller according to an embodiment of the present application; Figure 2 A partial enlarged view of position A of the air floating roller shown in the figure;

[0028] Figure 4 An axial sectional view of an air floating roller according to an embodiment of the present application;

[0029] Figure 5 A partial enlarged view of position B of the air floating roller shown in the figure; Figure 4 A partial enlarged view of position B of the air floating roller shown in the figure;

[0030] Figure 6 A schematic view of a fan blade according to an embodiment of the present application;

[0031] Figure 7 A schematic view of an air floating roller assembly and a pole piece according to an embodiment of the present application.

[0032] Reference signs:

[0033] Air floating roller 1000;

[0034] Roller body 100; peripheral wall 110; air outlet 111; air inlet 112; cavity 120; first cavity 121; second cavity 122; flow uniformizing plate 130; opening 131; cross-flow fan 140; motor 150;

[0035] Blade 200; groove 210; airfoil 220; first curved surface 221; second curved surface 222; transition surface 223; side surface 224; circular-arc surface 225; flat surface 226; L-shaped baffle 230; butterfly adjusting member 240;

[0036] Pole piece 300. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like component have the same or similar designations. The embodiments described below are presented by way of example only and are not intended to limit the present application as the present application can be implemented in any number of variations.

[0038] In the description of the present application, if the orientation description, such as up, down, front, back, left, right, and the like, is referred to, the orientation or positional relationship shown in the drawings is based on the orientation or positional relationship, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0039] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, and the like are understood as not including the number, above, below, and the like are understood as including the number. If the first, second, and the like are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0040] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0041] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] In the technical field of lithium battery, the pole piece is coated by aluminum foil or copper foil, in the double-sided coating process, the aluminum foil or copper foil coated on one side has slurry, so the general roller cannot be used for support, and the slurry on the pole piece cannot be in contact with the roller body to affect the quality of the coating of the pole piece.

[0043] In the related art, the required suspension support of the pole piece is realized by air floating roller air jet, and the air supply is usually realized by external air blower, the air flow enters the air floating roller from the axial end, the air pressure in the middle is high, the air flow speed is fast, the end air pressure is low, the air flow speed is slow, and the outflowing turbulent air flow is easy to cause uneven force of the pole piece suspension, or the air supply is realized by external air blower, the air flow enters from the bottom of the air floating roller, but the jet air flow is also uneven, the air pressure is low, the air volume is small, and the coating quality of the pole piece and the stability of the pole piece suspension are affected.

[0044] Reference Figures 1 to 6 The present application provides an air floating roller 1000 including a roller body 100 and a fan blade 200. The roller body 100 has a peripheral wall 110 surrounding the outer periphery thereof, and the peripheral wall 110 is provided with an air outlet 111 extending in the axial direction of the roller body 100. The roller body 100 is internally provided with a cavity 120 extending in the axial direction, and the air outlet 111 is in communication with the cavity 120, so that the air flow can flow out of the cavity 120 through the air outlet 111. The fan blade 200 is arranged at the air outlet 111 and extends in the axial direction of the roller body 100. The fan blade 200 is provided with a groove 210 extending in the axial direction of the roller body 100, and the opening of the groove 210 faces the inner side of the cavity 120.

[0045] In some embodiments of the present application, the roller body 100 can be a cylinder or a semi-cylinder with a flat plane. The specific shape of the roller body 100 can be determined according to the actual situation, and the shape of the roller body 100 should not be a limitation of the present application. In the cylinder, the axial direction refers to the direction along the center axis of the cylinder. In the semi-cylinder, the axial direction refers to the direction along the center axis of the circular arc surface 225. It should be noted that the roller body 100 can also be a solid body of other shapes, in which case the axial direction refers to the direction along the largest dimension of the roller body 100. The axial direction should also not be a limitation of the present application.

[0046] It can be understood that the groove 210 provided on the fan blade 200 can be placed on one side of the fan blade 200, that is, the fan blade 200 is provided with only one groove 210, or can be provided on both sides of the fan blade 200, that is, the fan blade 200 is provided with two grooves 210. The skilled person in the relevant field of the present application can determine according to the actual situation, but the opening of the groove 210 needs to face the cavity 120. It should be noted that the depth of the groove 210 should be set in a suitable range. If the depth of the groove 210 is too shallow, the air pressure cannot be effectively accumulated, and if the depth of the groove 210 is too deep, the airflow cannot smoothly flow out of the groove 210. At the same time, the size of the groove 210 can be reasonably selected according to the size of the fan blade 200. It should be noted that the specific shape of the fan blade 200 can be determined according to the actual situation, but the regions and the junctions through which the airflow passes on the fan blade 200 should be smoothly transitioned to enable the airflow to smoothly flow along the predetermined trajectory.

[0047] With reference to Figures 1 to 6 In some embodiments, the fan blade 200 is provided at the air outlet 111 of the roller body 100 in the air floating roller 1000, and the opening of the groove 210 on the fan blade 200 faces the cavity 120. The airflow in the cavity 120 flows through the groove 210 of the fan blade 200 before flowing out of the air outlet 111. Due to the obstruction of the groove 210 to the airflow, a negative pressure area is formed, the airflow flows to both sides along the axial direction of the roller body 100 at the groove 210 and accumulates, the airflow flow tends to be uniform, and the air pressure gradually increases. Due to the wall attachment characteristics of the fluid itself, the airflow with large flow rate gradually flows out of the air outlet 111 along the surface of the groove 210 and the fan blade 200. The pole piece 300 is stably suspended above the air floating roller 1000. The integrity of the coating on the pole piece 300 is protected, the quality and yield of the pole piece 300 are improved, and the performance of the battery is improved.

[0048] It should be noted that the wall attachment effect is also known as the Coanda effect or the Coandǎ effect, which refers to the tendency of a fluid (water flow or air flow) to deviate from its original flow direction and flow along the surface of a convex object. When there is surface friction between the fluid and the surface of the object through which the fluid flows (which can also be said to be the viscosity of the fluid), as long as the curvature is not large, the fluid will flow along the surface of the object.

[0049] In some embodiments, the number of fan blades 200 can be set to multiple, and multiple fan blades 200 can be arranged at the air outlet 111 in a direction perpendicular to the axial direction of the air floating roller 1000, and adjacent two fan blades 200 are spaced apart by a certain distance. It can be understood that the multiple fan blades 200 can be in the same plane. It should be noted that the spacing between each fan blade 200 can be uniform. The arrangement of multiple fan blades 200 can make the gas flow out along the wall surface of the multiple fan blades 200, which can make the airflow ejected by the air floating roller 1000 more uniform and the coverage of the airflow wider. Thus, the air floating roller 1000 can exert a more stable suspension support effect.

[0050] It can be understood that when multiple wind blades 200 are selected to be arranged, the grooves 210 of the wind blades 200 can be arranged on one side of the wind blades 200, and the position relationship of each groove 210 with the wind blade 200 needs to be consistent. If the grooves 210 are arranged on both sides of the wind blade 200, the grooves 210 of adjacent wind blades 200 will be in opposite positions. At this time, the airflow flowing out of the grooves 210 will collide, and the flow direction of the airflow will become disordered, and the flow rate of the airflow accelerated by the grooves 210 will also decrease, thereby causing the uniformity of the airflow out of the air floating roller 1000 to become poor, the airflow flow rate to decrease, and the target function to be unable to be achieved.

[0051] With reference to Figure 4 , Figure 5 and Figure 6 , in some embodiments, the wind blade 200 includes an airfoil 220 and an L-shaped baffle 230, and the airfoil 220 is connected to one side of the L-shaped baffle 230 to jointly form the groove 210. The airfoil 220 has a first curved surface 221 close to the groove 210 and a second curved surface 222 away from the groove 210, and the first curved surface 221 is connected to the second curved surface 222 through a transition surface 223. The first curved surface 221 is concave toward one side of the groove 210, and the second curved surface 222 is convex toward one side of the groove 210. It can be understood that the L-shaped baffle 230 can be composed of a vertical baffle and a horizontal baffle, and the included angle between the vertical baffle and the horizontal baffle can be 90 degrees or greater than 90 degrees. The two ends of the horizontal baffle can be respectively connected to one end of the vertical baffle and one end of the airfoil 220. The arrangement of the curved surface can make the airflow smoothly adhere to the wind blade 200 to flow, and better play the wall attachment characteristics of the airflow. When multiple wind blades 200 are selected to be arranged, the vertical baffle can isolate the airflow on both sides thereof to ensure the consistency of the airflow direction. It should be noted that the wall surface through which the airflow flows on the L-shaped baffle 230 can be arranged as a plane or a curved surface, as long as it does not affect the normal flow of the airflow.

[0052] With reference to Figure 4 , Figure 5 and Figure 6 , in some embodiments, the curvature of the first curved surface 221 on the airfoil 220 is greater than the curvature of the second curved surface 222. That is, the cross-sectional area of the airfoil 220 of the wind blade 200 along the axial direction of the roller body 100 presents a shape in which the end portion is small and the middle portion is large. This can make the airflow accumulated in the groove 210 flow more smoothly along the wall surface of the airfoil 220. The outflowing airflow is more uniform. It should be noted that the curvature of a curve is the turning rate of the tangent direction angle of a point on the curve with respect to the arc length, which is defined by differentiation, and indicates the degree to which the curve deviates from a straight line. The greater the curvature, the greater the bending degree of the curve.

[0053] With reference to Figure 4 , Figure 5 and Figure 6In some embodiments, the side surface 224 of the airfoil 220, which is away from the connection of the L-shaped baffle 230, is a circular arc surface 225, and the side surface 224 further comprises a flat surface 226, one end of the flat surface 226 is connected to the circular arc surface 225 and the other end of the flat surface 226 is connected to the second curved surface 222. It can be understood that the side surface 224 further comprises the second curved surface 222. The flat surface 226 and the circular arc can make the air flow more smoothly, and can also ensure the consistency and uniformity of the air flow.

[0054] With reference to Figure 1 , Figure 2 and Figure 3 In some embodiments, the roller body 100 is provided with a butterfly adjusting piece 240 at the end in the axial direction, and the butterfly adjusting piece 240 is connected to the fan blade 200. Rotating the butterfly adjusting piece 240 can rotate the fan blade 200 in a direction perpendicular to the axial direction of the roller body 100. That is, the installation angle of the fan blade 200 can be adjusted according to actual needs. The structure of the butterfly adjusting piece 240 facilitates the relevant operation of the technician. It can be understood that the adjusting piece can also be of other shapes, and the butterfly adjusting piece 240 should not be regarded as a limitation of the present application. At the same time, the butterfly adjusting piece 240 can also be arranged at other positions according to actual conditions, as long as it is convenient to adjust the angle of the fan blade 200.

[0055] In some embodiments, the roller body 100 is provided with a flow equalizing plate 130 inside, that is, the flow equalizing plate 130 can separate the cavity 120 of the roller body 100 into two cavities, the flow equalizing plate 130 and the side of the roller body 100 close to the air outlet 111 form a first cavity 121, and the air outlet 111 is in communication with the first cavity 121. The flow equalizing plate 130 is provided with a plurality of openings 131 spaced apart along the axial direction of the roller body 100, and the airflow can uniformly enter the first cavity 121 through the plurality of openings 131.

[0056] It can be understood that the opening 131 can be a circular hole, and a large aperture of 5mm-20mm can be used. The large aperture can make the airflow pass through the flow equalizing plate 130 more smoothly, reducing the loss of pressure. The plurality of openings 131 can be uniformly spaced, so that the turbulent airflow becomes more uniform after passing through the flow equalizing plate 130. Thus, the airflow becomes more uniform after passing through the fan blade 200 from the air outlet 111. The more stable suspension support of the pole piece 300 is achieved.

[0057] In some embodiments, the flow-equalizing plate 130 forms a second cavity 122 with the side of the roller body 100 facing away from the first cavity 121, and a cross-flow fan 140 is arranged inside the second cavity 122 along the axial direction of the roller body 100. The air-floatation roller 1000 is provided with air outlets 111 near the peripheral wall 110 of the second cavity 122, and the air outlets 111 are arranged in multiple numbers and are arranged in sequence along the axial direction of the air-floatation roller 1000. The end of the roller body 100 is connected with a motor 150, and the motor 150 provides kinetic energy to rotate the cross-flow fan 140 to generate uniform airflow from the second cavity 122 to the first cavity 121. It should be noted that an external fan can also be arranged to provide airflow to the second cavity 122 through the air inlet. The arrangement position of the fan should not be regarded as a limitation of the present application.

[0058] It can be understood that the multiple air outlets 111 can be arranged at uniform intervals, or arranged in groups, and the intervals between adjacent air outlets 111 in each group are equal. Meanwhile, the multiple groups are arranged at uniform intervals with a larger interval. Since the cross-flow fan inhales air from the outside of the air-floatation roller 1000, the interval between adjacent air outlets 111 can block foreign matters larger than the aperture from entering the second cavity 122, thereby preventing damage to the cross-flow fan 140.

[0059] It can be understood that, in order to better inhale air by the cross-flow fan, the roller body 100 arranged at the side of the cross-flow fan can be arranged as a semi-cylindrical body, which can increase the air inlet area of the air-floatation roller 1000 and obtain large-flow airflow.

[0060] The present application also provides an air-floatation roller assembly. Referring to Figure 7 , the air-floatation roller assembly comprises multiple air-floatation rollers 1000 as described in the above embodiments, and the multiple air-floatation rollers 1000 are arranged in sequence along the direction perpendicular to the axial direction of the air-floatation roller 1000. Since the air-floatation roller assembly adopts the air-floatation roller 1000 of the above embodiments, at least the beneficial effects brought by the technical solutions of the above embodiments are achieved, which will not be repeated here. It can be understood that the intervals between adjacent air-floatation rollers 1000 can be uniform intervals or non-uniform intervals, which is determined according to actual conditions. Meanwhile, the air-floatation roller assembly can also suspend and support larger-volume and larger-number pole pieces to improve the production efficiency.

[0061] The present application also provides a coating machine. Since the coating machine comprises the air-floatation roller 1000 as described in the above embodiments, at least the beneficial effects brought by the technical solutions of the above embodiments are achieved, which will not be repeated here.

[0062] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. An air floatation roller characterized by, The application relates to a gas suspension roller. The roller body has a peripheral wall, an air outlet is arranged on the peripheral wall and extends along the axial direction of the roller body, and a cavity extending along the axial direction is arranged in the roller body, and the air outlet communicates with the cavity. A fan blade is arranged at the air outlet and extends along the axial direction of the roller body, the fan blade has a groove extending along the axial direction of the roller body, and the opening of the groove faces the inner side of the cavity. The airflow in the cavity flows through the groove of the fan blade before flowing out of the air outlet. The airflow is hindered by the groove to form a negative pressure area, the airflow flows to both sides along the axial direction of the roller body at the groove and accumulates, the airflow flow tends to be uniform, the air pressure gradually increases, and the airflow with large flow rate gradually flows out of the air outlet along the surface of the groove and the fan blade due to the wall attachment characteristics of the airflow itself. The pole piece is stably suspended on the gas suspension roller. The number of the fan blades is multiple, the multiple fan blades are arranged at the air outlet in a vertical direction of the axial direction of the gas suspension roller, and the multiple fan blades are in the same plane. The fan blade comprises an airfoil and an L-shaped baffle, the airfoil is connected to one side of the L-shaped baffle to form the groove, the L-shaped baffle is composed of a vertical baffle and a horizontal baffle, the two ends of the horizontal baffle are connected to one end of the vertical baffle and one end of the airfoil respectively, and the vertical baffle can isolate the airflow on both sides to ensure the consistency of the airflow direction.

2. The air floatation roller according to claim 1, characterized by The airfoil has a first curved surface close to the groove and a second curved surface away from the groove, the first curved surface is concave to one side of the groove, and the second curved surface is convex to one side of the groove.

3. The air floatation roller according to claim 1, wherein The curvature of the first curved surface is greater than that of the second curved surface.

4. The air floatation roller according to claim 3, characterized in that, The side surface of the airfoil away from the groove and connected to the L-shaped baffle is a circular arc surface, the side surface comprises a flat surface, one end of the flat surface is connected to the circular arc surface, and the other end of the flat surface is connected to the second curved surface. The end of the roller body along the axial direction is provided with a butterfly-shaped adjusting piece connected to the fan blade, and rotating the butterfly-shaped adjusting piece can rotate the fan blade in a direction perpendicular to the axial direction of the roller body.

5. An air float roller assembly characterized by, The inside of the roller body is provided with a flow uniformizing plate, the flow uniformizing plate and the side of the roller body close to the air outlet form a first cavity, the flow uniformizing plate is provided with multiple openings along the axial direction of the roller body, and the airflow can enter the first cavity through the multiple openings.

6. A coater characterized by comprising: The flow uniformizing plate and the side of the roller body away from the first cavity form a second cavity, the second cavity is provided with a cross-flow fan, the cross-flow fan is arranged along the axial direction of the roller body, and the cross-flow fan can generate airflow flowing from the second cavity to the first cavity. The peripheral wall of the gas suspension roller close to the second cavity is provided with multiple air inlets, and the multiple air inlets are sequentially and spacedly arranged along the axial direction of the gas suspension roller. The application further relates to multiple gas suspension rollers as claimed in any one of claims 1 to 4, and the multiple gas suspension rollers are sequentially and spacedly arranged in a direction perpendicular to the axial direction of the gas suspension roller. The application further relates to the gas suspension roller as claimed in any one of claims 1 to 4.

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