Diaphragm double-sided coating machine

Abstract

The application discloses a diaphragm double-sided coating machine which comprises a first unwinding assembly, a first preheating assembly, a first coating assembly, a first oven assembly, a second coating assembly, a second oven assembly, a flaw detection assembly and a winding assembly; the first unwinding assembly, the first coating assembly and the second coating assembly are arranged on a first horizontal plane, and the first unwinding assembly is arranged between the first coating assembly and the second coating assembly; the first oven assembly is provided with an arc-shaped first oven channel; the second oven assembly is provided with an arc-shaped second oven channel; the winding assembly is arranged on the first horizontal plane, and the technical effects are as follows: the first oven assembly and the second oven assembly are stacked in the height direction, so that the diaphragm coated on both sides is dried respectively; meanwhile, the first unwinding assembly and the second unwinding assembly are arranged at the bottom of the first oven assembly, so that the length direction space is not occupied, compact design is realized, and the floor space is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery separator manufacturing, and particularly relates to a separator double-sided coating machine. BACKGROUND

[0002] Coating is an important process in the production process of lithium ion battery separators, and the process is to uniformly and continuously or discontinuously coat the prepared slurry on the substrate. At present, the structure of the separator double-sided coating machine is complex, and the production line occupies a large space, especially in the length direction, which puts higher requirements on the floor area of the factory building, and is not conducive to realizing compact double-sided layout.

[0003] In addition, the drying tunnel of the coating machine is usually in a horizontal state, and the separator is subjected to a large tension during drying, and the separator is easily stretched, and the hot air sweeping of the drying tunnel is uneven, so that defects are easily generated on the surface of the separator.

[0004] Therefore, it is necessary to develop a separator double-sided coating machine to overcome the above-mentioned defects. SUMMARY

[0005] To solve the above technical problems, the purpose of the present application is to disclose a separator double-sided coating machine, through the first drying assembly and the second drying assembly stacked in the height direction, the double-sided coated separator is dried respectively, and at the same time, the first unwinding assembly and the second unwinding assembly are arranged at the bottom of the first drying assembly, so that the space in the length direction is not occupied, and compact design is realized, and the floor area is greatly reduced.

[0006] To achieve the above-mentioned purpose of the application, the present application provides a separator double-sided coating machine, which comprises a first unwinding assembly, a first preheating assembly, a first coating assembly, a first drying assembly, a second coating assembly, a second drying assembly, a defect detection assembly and a winding assembly.

[0007] The first unwinding assembly, the first coating assembly and the second coating assembly are arranged on a first horizontal plane, and the first unwinding assembly is arranged between the first coating assembly and the second coating assembly.

[0008] The first drying assembly is arranged on a second horizontal plane above the first horizontal plane.

[0009] The second drying assembly is arranged on a third horizontal plane above the second horizontal plane.

[0010] The winding assembly is arranged on the first horizontal plane.

[0011] The diaphragm sequentially passes through the first unwinding assembly, the first preheating assembly, the first coating assembly, the first oven assembly, the second coating assembly, the second oven assembly, the flaw detection assembly and the winding assembly.

[0012] Preferably, the first unwinding traction assembly, the second unwinding traction assembly and the winding traction assembly are further included.

[0013] The first unwinding traction assembly is arranged between the first preheating assembly and the first coating assembly.

[0014] The second unwinding traction assembly is arranged between the first oven assembly and the second coating assembly.

[0015] The diaphragm enters the winding assembly after leaving the winding traction assembly.

[0016] Preferably, the first suction roller, the second suction roller and the third suction roller are further included.

[0017] The first suction roller is arranged between the first coating assembly and the first oven assembly.

[0018] The second suction roller is arranged between the second coating assembly and the second oven assembly.

[0019] The third suction roller is arranged between the second oven assembly and the winding traction assembly.

[0020] Preferably, the first deviation correction assembly and the second deviation correction assembly are further included.

[0021] The first deviation correction assembly is arranged at the diaphragm exit end of the first oven assembly.

[0022] The second deviation correction assembly is arranged at the diaphragm exit end of the second oven assembly.

[0023] Preferably, the diaphragm thickness detection assembly is further included, and the diaphragm thickness detection assembly is arranged at the diaphragm entry end of the flaw detection assembly.

[0024] Preferably, the second unwinding assembly and the second preheating assembly are further included, and the diaphragm sequentially passes through the second unwinding assembly and the second preheating assembly before entering the second coating assembly.

[0025] Preferably, the first oven assembly includes five groups of first oven channels, and the second oven assembly includes five groups of second oven channels.

[0026] Preferably, the first oven channel and the second oven channel have the same structure.

[0027] The first oven channel includes an oven cavity, a plurality of guide rollers arranged in an arc surface in the oven cavity and an air duct assembly in an inverted boat shape structure.

[0028] The air duct assembly comprises a hot air inlet, a first wedge-shaped cavity, a second wedge-shaped cavity, a plurality of air outlet assemblies and an air return outlet, the first wedge-shaped cavity and the second wedge-shaped cavity are communicated, and the plurality of air outlet assemblies face the guide rollers.

[0029] Preferably, the air outlet assembly comprises a shell and a first inlet at the top of the shell, the inside of the shell is provided with a mesh cavity, the top of the mesh cavity is provided with a second inlet, and the bottom of the mesh cavity is provided with a plurality of small holes.

[0030] The outer wall of the mesh cavity and the inner wall of the shell are bent to form symmetrically arranged first and second slits, and the air outlet directions of the first and second slits both face the small holes.

[0031] Preferably, the oven cavity is provided with a diaphragm inlet and a diaphragm outlet, and a negative pressure suction port is arranged beside each of the diaphragm inlet and the diaphragm outlet.

[0032] Compared with the prior art, the technical effects of the present application are as follows:

[0033] (1) The first oven assembly and the second oven assembly are stacked in the height direction, so that the diaphragm after double-sided coating is dried separately, and the first unwinding assembly and the second unwinding assembly are both arranged at the bottom of the first oven assembly, without occupying the space in the length direction, so that compact design is realized and the floor area is greatly reduced.

[0034] (2) The first unwinding assembly is arranged between the first coating assembly and the second coating assembly, and the first unwinding assembly fully utilizes the space at the bottom of the first oven assembly, without occupying the space in the length direction, so that compact design is realized and the floor area is greatly reduced.

[0035] (3) The first oven and the second oven are both in an arch shape, on the one hand, the arch-shaped air duct can increase the effective drying length of the diaphragm in a limited space, saving space, and on the other hand, the first oven and the second oven are relatively long in length, and through the arch-shaped arrangement, the wrap angle of the diaphragm when contacting the guide roller can be increased, so that the diaphragm receives more support and the tension of the diaphragm is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0037] Figure 1It is the main view structure schematic diagram of the diaphragm double-sided coating machine of the present application.

[0038] Figure 2 It is the main view structure schematic diagram of the diaphragm double-sided coating machine of the present application.

[0039] Figure 3 It is the three-dimensional structure schematic diagram of the oven channel of the present application.

[0040] Figure 4 It is the three-dimensional structure schematic diagram of the air duct assembly of the present application.

[0041] Figure 5 It is the three-dimensional structure schematic diagram of the air outlet assembly of the present application.

[0042] Figure 6 It is the main view structure schematic diagram of the air outlet assembly of the present application.

[0043] Figure 7 It is the three-dimensional structure schematic diagram of the mesh cavity of the present application.

[0044] Figure 8 It is the structure schematic diagram of the diaphragm inlet and diaphragm outlet of the present application.

[0045] In the formula, 1, first unwinding assembly; 2, first preheating assembly; 3, first coating assembly; 4, first oven assembly; 41, first oven channel; 411, oven cavity; 412, guide roller; 413, air duct assembly; 4131, hot air inlet; 4132, first wedge cavity; 4133, second wedge cavity; 4134, air outlet assembly; 4135, return air outlet; 5, second coating assembly; 6, second oven assembly; 62, second oven channel; 7, defect detection assembly; 8, winding assembly; 9, first unwinding traction assembly; 10, second unwinding traction assembly; 11, winding traction assembly; 12, first suction roller; 13, second suction roller; 14, third suction roller; 15, first deviation correction assembly; 16, second deviation correction assembly; 17, thickness detection assembly; 18, second unwinding assembly; 19, second preheating assembly; 20, shell; 201, first inlet; 202, mesh cavity; 2021, second inlet; 2022, small hole; 203, first slit; 204, second slit; 21, diaphragm inlet; 22, diaphragm outlet; 23, negative pressure suction port. DETAILED DESCRIPTION

[0046] The present application will be described in detail below in conjunction with the embodiments shown in the drawings, but it should be noted that these embodiments are not a limitation on the present application, and equivalent transformations or substitutions of function, method, or structure made by those of ordinary skill in the art based on these embodiments are within the scope of protection of the present application.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. Embodiment 1

[0048] Refer Figures 1 to 8 As shown, this embodiment discloses a specific implementation of a diaphragm double-sided coater (hereinafter referred to as "coater").

[0049] The diaphragm double-sided coater, refer Figures 1 to 8 As shown, it includes a first unwinding assembly 1, a first preheating assembly 2, a first coating assembly 3, a first oven assembly 4, a second coating assembly 5, a second oven assembly 6, a defect detection assembly 7 and a winding assembly 8; the first unwinding assembly 1, the first coating assembly 2 and the second coating assembly 5 are arranged on a first horizontal plane, and the first unwinding assembly 1 is arranged between the first coating assembly 2 and the second coating assembly 5; the first baking channel 41 of the first oven assembly 4 is arched, the first oven assembly 4 is arranged on a second horizontal plane, and the second horizontal plane is above the first horizontal plane; the second baking channel 61 of the second oven assembly 6 is arched, the second oven assembly 6 is arranged on a third horizontal plane, and the third horizontal plane is above the second horizontal plane; the winding assembly 8 is arranged on the first horizontal plane; the diaphragm passes through the first unwinding assembly 1, the first preheating assembly 2, the first coating assembly 3, the first oven assembly 4, the second coating assembly 5, the second oven assembly 6, the defect detection assembly 7 and the winding assembly 8 in sequence. <00001​Specifically, in order to reduce the floor space occupied by the coating machine, increase the layout of the coating machine in the height direction, and reduce the layout of the coating machine in the length direction, specifically, from the ground or the supporting surface, the first level, the second level and the third level are set, wherein the first unwinding assembly 1, the first preheating assembly 2, the first coating assembly 3, the second coating assembly 5, the flaw detection assembly 7 and the winding assembly 8 are arranged on the first level, and the first unwinding assembly 1 and the first preheating assembly 2 are both arranged below the first oven assembly 4, without occupying the space of the coating machine in the length direction, the first oven assembly 4 and the second oven assembly 6 are stacked in the height direction, and the first unwinding assembly 1 and the first preheating assembly 2 are arranged by using the space at the bottom of the first oven assembly 4, so that the floor space occupied by the coating machine in the length direction is greatly reduced, the height space is fully utilized, and the land area is saved.

[0051] Referring to Figure 1 and Figure 2 , the coating machine further comprises a first unwinding traction assembly 9, a second unwinding traction assembly 10 and a winding traction assembly 11; the first unwinding traction assembly 9 is arranged between the first preheating assembly 2 and the first coating assembly 3; the second unwinding traction assembly 10 is arranged between the first oven assembly 4 and the second coating assembly 5; the diaphragm enters the winding assembly 8 after leaving the winding traction assembly 11, the first preheating assembly 2 is designed in a slip structure, so that the friction force acting on the diaphragm is minimized, and the diaphragm is prevented from being stretched and deformed during the preheating process, the diaphragm after preheating is pulled to the first coating assembly 3 by the first unwinding traction assembly 9, the diaphragm passing through the first oven assembly 4 is pulled to the second coating assembly 5 by the second unwinding traction assembly 10, and the diaphragm of the second oven assembly 6 is pulled to the winding assembly 8 by the winding traction assembly 11.

[0052] Referring to Figure 1 and Figure 2 , the diaphragm coating needs to be controlled at a low tension because the substrate used has a large elongation, and the deformation amount of the substrate needs to be reduced in tension interruption or control, and the vacuum suction roller can realize diaphragm tension interruption, therefore, the coating machine further comprises a first suction roller 12, a second suction roller 13 and a third suction roller 14; the first suction roller 12 is arranged between the first coating assembly 3 and the first oven assembly 4; the second suction roller 13 is arranged between the second coating assembly 5 and the second oven assembly 6; and the third suction roller 14 is arranged between the second oven assembly 6 and the winding traction assembly 11. Specifically, the first suction roller 12, the second suction roller 13 and the third suction roller 14 are used to interrupt the tension of the diaphragm before entering the first oven assembly 4, before entering the second oven assembly 6 and before entering the winding assembly 8 respectively, and to control the tension at a low level.

[0053] Referring to Figure 1 and Figure 2, in order to ensure that the membrane winding both ends flush, the coating machine also includes a first deviation correction assembly 15 and a second deviation correction assembly 16; the first deviation correction assembly 15 is provided at the membrane leaving end of the first oven assembly 4; the second deviation correction assembly 16 is provided at the membrane leaving end of the second oven assembly 6, that is, after the first drying and the second drying, the deviation is corrected respectively, in order to prepare for the winding of both ends flush.

[0054] Referring to Figure 1 and Figure 2 , in order to ensure that the membrane winding process and timely detection of the thickness fluctuation of the membrane, the coating machine also includes a membrane thickness detection assembly 17, and the membrane thickness detection assembly 17 is arranged at the membrane entering end of the defect detection assembly 7.

[0055] It needs to be further explained that the running line of the membrane is as follows: after the membrane is unwound by the first unwinding assembly 1, it passes through the first preheating assembly 2, the first unwinding traction assembly 9, the first coating assembly 3, the first suction roller 12, the first oven assembly 4, the first deviation correction assembly 15, the second unwinding traction assembly 10, the second coating assembly 5, the second suction roller 13, the second oven assembly 6, the second deviation correction assembly 16, the third suction roller 14, the membrane thickness detection assembly 17, the defect detection assembly 7, the winding traction assembly 11 and the winding assembly 8 in sequence, and the double-sided coating and winding are completed. Embodiment 2

[0056] Referring to Figure 2 , on the basis of embodiment 1, the second unwinding assembly 18 and the second preheating assembly 19 are further included at the bottom of the first oven assembly 4, the membrane enters the second coating assembly 5 after passing through the second unwinding assembly 18 and the second preheating assembly 19 in sequence, and then passes through the second suction roller 13, the second oven assembly 6, the second deviation correction assembly 16, the third suction roller 14, the membrane thickness detection assembly 17, the defect detection assembly 7, the winding traction assembly 11 and the winding assembly 8, and the single-sided coating and winding are completed.

[0057] The second unwinding assembly 18 of embodiment 2 can realize the single-sided coating of the membrane, can adapt to more coating requirements of the membrane product, and the positions of the second unwinding assembly 18 and the second preheating assembly 19 are placed at the bottom of the first oven assembly 4, without expanding the overall area of the coating machine, and the compactness is high. Embodiment 3

[0058] On the basis of embodiment 1 or embodiment 2, referring to Figures 3 to 7In order to reduce the surface defects of the diaphragm in the drying process, the first oven assembly 4 comprises five groups of first drying channels 41, and the second oven assembly 6 comprises five groups of second drying channels 61, the five groups of first drying channels 41 form an arch-shaped drying channel, and the five groups of second drying channels 61 form an arch-shaped drying channel, which can increase the length of the diaphragm drying channel and increase the support of the diaphragm through the arch-shaped design in a limited space, and reduce the tension of the diaphragm.

[0059] It should be further pointed out that the first drying channel 41 and the second drying channel 61 are the same structure, but according to the arrangement of the arch, the inclination angles of each first drying channel 41 and the second drying channel 61 are different; taking the first drying channel 41 as an example for description, referring to Figures 3 to 7 , the first drying channel 41 comprises an oven cavity 411 and a plurality of guide rollers 412 arranged in an arc surface and a wind channel assembly 413 in the form of an inverted boat structure in the oven cavity 411; the wind channel assembly 413 comprises a hot air inlet 4131, a first wedge-shaped cavity 4132, a second wedge-shaped cavity 4133, a plurality of air outlet assemblies 4134 and a return air outlet 4135, the first wedge-shaped cavity 4132 and the second wedge-shaped cavity 4133 are communicated, the plurality of air outlet assemblies 4134 face the guide rollers, and the air outlet assemblies 4134 are uniformly arranged at the bottom of the wind channel assembly 413.

[0060] The diaphragm passes through the oven cavity 411 along the plurality of guide rollers 412 arranged in an arc surface, and in this process, the diaphragm is dried by the hot air of the air outlet assembly 4134, in order to ensure that the air outlet speed of each air outlet assembly 4134 remains basically the same, after the hot air enters the wind channel assembly 413 from the hot air inlet 4131, the hot air is distributed to both sides through the first wedge-shaped cavity 4132 and the second wedge-shaped cavity 4133, because the space of the first wedge-shaped cavity 4132 and the second wedge-shaped cavity 4133 gradually decreases along the flow direction of the hot air, the wind speed at the hot air inlet does not gradually decrease along the flow direction of the hot air, but remains basically the same along with the gradually decreasing space of the first wedge-shaped cavity 4132 and the second wedge-shaped cavity 4133, so that the air outlet of the air outlet assembly 4134 is uniform, and the drying process of the diaphragm is uniform, and surface defects are not easy to occur.

[0061] To further ensure that the wind blowing to the diaphragm is uniform, a plurality of air outlet assemblies 4134 are arranged along the bottom of the air duct assembly 413, wherein the number of air outlet assemblies 4134 at the bottom of the first wedge-shaped cavity 4132 is greater than the number of air outlet assemblies 4134 at the bottom of the second wedge-shaped cavity 4133; on the basis of preliminary uniformization of the wind through the wedge-shaped cavity, the uniformization structure of the air outlet assembly 4134 is also indispensable, and the specific technical solutions are as follows: the air outlet assembly 4134 comprises a shell 20 and a first inlet 201 at the top of the shell 20, a mesh cavity 202 is arranged in the shell 20, a second inlet 2021 is arranged at the top of the mesh cavity 202, a plurality of small holes 2022 are arranged at the bottom of the mesh cavity 202, and after the hot air enters the shell 20 from the first inlet 201, a part of the hot air enters the mesh cavity 202 from the second inlet 2021 and then blows to the diaphragm through the plurality of small holes 2022, and the small holes 2022 play a role in uniformizing the wind; the outer wall of the mesh cavity 202 and the inner wall of the shell 20 are bent to form symmetrically arranged first and second slits 203 and 204, and the air outlet directions of the first and second slits 203 and 204 both face the small holes 2022; after the hot air of the air outlet assembly 4134 enters the shell 20 from the first inlet 201, a part of the hot air enters the mesh cavity 202 from the second inlet 2021 and is blown out through the plurality of small holes 2022; another part of the hot air is blown out through the first and second slits 203 and 204, and the air directions of the hot air blown out through the first and second slits 203 and 204 are perpendicular to the air direction of the hot air blown out through the small holes 2022, so that the hot air blown out through the small holes 2022 is swept by the hot air blown out through the first and second slits 203 and 204 and then blown to the diaphragm in a more uniform manner and with a changed air direction, thereby realizing multi-level uniformization of the wind, making the drying process of the diaphragm uniform, and preventing surface defects from being easily generated.

[0062] In summary, in example 3, the first pass of uniformization of the wind is realized by the inverted boat-shaped air duct assembly 413, the second pass of uniformization of the wind is realized by the distribution of the air volume among the mesh cavity 202, the first slit 203 and the second slit 204, and the third pass of uniformization of the wind is realized by the collision of the air directions of the hot air blown out through the small holes 2022, the first slit 203 and the second slit 204 of the mesh cavity 202, so that the air outlet assemblies 4134 at all positions of the air duct assembly 413 can blow to the diaphragm uniformly, the drying process of the diaphragm is uniform, and surface defects are not easily generated.

[0063] Referring to Figure 8 , in order to minimize the entry of external wind into the oven cavity 411 from the diaphragm inlet 21 or the diaphragm outlet 22, the oven cavity 411 is provided with a diaphragm inlet 21 and a diaphragm outlet 22, and a negative pressure suction port 23 is arranged beside each of the diaphragm inlet 21 and the diaphragm outlet 22, so as to draw away the gas near the diaphragm inlet 21 or the diaphragm outlet 22 through the negative pressure suction port 23 and reduce the entry of external wind into the oven cavity 411 from the diaphragm inlet 21 or the diaphragm outlet 22.

[0064] The diaphragm double-sided coating machine disclosed in this embodiment has the same technical solutions as those in Embodiment 1 or Embodiment 2, and details are described in Embodiment 1 or Embodiment 2, which are not described herein again.

Claims

1. A diaphragm double-sided coater characterized by comprising: It includes a first unwinding assembly, a first preheating assembly, a first coating assembly, a first drying oven assembly, a second coating assembly, a second drying oven assembly, a defect detection assembly, and a rewinding assembly; The first unwinding assembly, the first coating assembly, and the second coating assembly are disposed on a first horizontal plane, with the first unwinding assembly disposed between the first coating assembly and the second coating assembly; The first drying tunnel of the first oven assembly is arched, and the first oven assembly is disposed on a second horizontal plane, which is above the first horizontal plane; The second drying tunnel of the second oven assembly is arched, and the second oven assembly is located on a third horizontal plane, which is above the second horizontal plane; The winding assembly is disposed on the first horizontal plane; The diaphragm passes sequentially through the first unwinding assembly, the first preheating assembly, the first coating assembly, the first drying oven assembly, the second coating assembly, the second drying oven assembly, the defect detection assembly, and the rewinding assembly; The first oven assembly includes five sets of first drying tunnels, and the second oven assembly includes five sets of second drying tunnels; The first drying tunnel and the second drying tunnel have the same structure; The first drying tunnel includes an oven cavity and several guide rollers arranged in an arc shape and an air duct assembly with an inverted boat shape within the oven cavity. The air duct assembly includes a hot air inlet, a first wedge-shaped cavity, a second wedge-shaped cavity, a plurality of air outlet components, and a return air outlet. The first wedge-shaped cavity and the second wedge-shaped cavity are connected, and the plurality of air outlet components face the guide roller. The air outlet assembly includes a housing and a first inlet at the top of the housing. A mesh cavity is provided inside the housing, a second inlet is provided at the top of the mesh cavity, and several small holes are provided at the bottom of the mesh cavity. The outer wall of the mesh cavity and the inner wall of the shell are bent to form a first slit and a second slit arranged symmetrically, and the air outlet direction of the first slit and the second slit is facing the small hole.

2. The diaphragm double-sided coating machine as described in claim 1, characterized in that, It also includes a first unwinding traction assembly, a second unwinding traction assembly, and a winding traction assembly; The first unwinding traction assembly is disposed between the first preheating assembly and the first coating assembly; The second unwinding traction assembly is disposed between the first drying oven assembly and the second coating assembly; After the diaphragm leaves the winding traction assembly, it enters the winding assembly.

3. The diaphragm double-sided coating machine as described in claim 2, characterized in that, It also includes a first adsorption roller, a second adsorption roller, and a third adsorption roller; The first adsorption roller is disposed between the first coating assembly and the first drying oven assembly; The second adsorption roller is disposed between the second coating assembly and the second drying oven assembly; The third adsorption roller is disposed between the second drying oven assembly and the winding traction assembly.

4. The diaphragm double-sided coating machine as described in claim 3, characterized in that, It also includes a first correction component and a second correction component; The first correction component is disposed at the diaphragm exit end of the first oven assembly; The second correction component is disposed at the diaphragm exit end of the second oven component.

5. The diaphragm double-sided coating machine as described in claim 4, characterized in that, It also includes a diaphragm thickness detection component, which is disposed at the diaphragm inlet end of the defect detection component.

6. The diaphragm double-sided coating machine as described in any one of claims 1-5, characterized in that, It also includes a second unwinding assembly and a second preheating assembly, and the diaphragm enters the second coating assembly after passing through the second unwinding assembly and the second preheating assembly.

7. The diaphragm double-sided coating machine as described in claim 1, characterized in that, The oven cavity is provided with a diaphragm inlet and a diaphragm outlet, and a negative pressure suction port is provided next to both the diaphragm inlet and the diaphragm outlet.

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