Coating equipment for front and back surfaces of cloth

Abstract

The utility model discloses cloth front and back surface coating equipment, which is used for simultaneously depositing and coating the front and back surfaces of cloth, and comprises a coating device, a power supply, a pre-tightening device and a traction device, the coating device comprises two PECVD (Plasma Enhanced Chemical Vapor Deposition) mechanisms which are symmetrically arranged up and down, and a deposition cavity for depositing and coating the cloth is formed between the two PECVD mechanisms; the deposition cavity is provided with a through hole for cloth to pass through; the power supply is electrically connected with the two PECVD mechanisms correspondingly and is used for ionizing process gas; the pre-tightening device is arranged in front of the coating device and is used for providing pre-tightening force for the transmission of the cloth in the whole deposition coating process; the traction device is arranged behind the coating device and provides traction power for transmission of the cloth in the whole deposition coating process. Through the matching of the components, stable and uniform coating layers can be simultaneously formed on the front surface and the back surface of the cloth, so that the cloth of which the front surface and the back surface are coated is formed.

Description

Technical Field

[0001] The utility model relates to a loom system made of special cloth, in particular to a cloth front and back surface coating device used for coating the cloth. Background Art

[0002] With the rapid development of technology in all walks of life, engineers have also put forward more refined requirements and indicators for the expected effects of the products to be developed. At the same time, when seeking technological breakthroughs, engineers also pay more attention to cross-domain and team collaboration. Traditional fabrics used for decoration, warmth, and shielding have also been given more functions in today's rapid technological development, making these traditional fabrics glow with a different brilliance. For example, fabrics with conductive functions, fabrics with anti-electromagnetic radiation, fabrics with laser protection functions, and reflective fabrics, etc., these fabrics with special functions have a common feature, that is, the surface of the fabric is sprayed with a special coating corresponding to the special function, so that the fabric has special functions. The existing coating formed by spraying, on the one hand, has poor adhesion, cannot withstand the folding of the fabric, and is easy to crack and fall off, resulting in the loss of special functions; on the other hand, the coating thickness is uneven, resulting in large functional differences, and can only be used for basic daily use, and cannot be used in industries and products with certain requirements for function and stability. In addition, many new materials such as silicon, tin oxide, diamond-like coating (DLC), silicon nitride, titanium nitride and other new materials cannot be formed on the fabric by spraying, which limits the development of specialized functions of the fabric.

[0003] Therefore, there is an urgent need to provide a cloth front and back coating device that can simultaneously form a stable and uniform coating layer on the front and back surfaces of the cloth. Utility Model Content

[0004] The utility model aims to provide a cloth front and back coating device, which can form a stable and uniform coating layer on the front and back surfaces of the cloth at the same time.

[0005] To achieve the above-mentioned purpose, the utility model provides a cloth front and back coating device, which is used to deposit coating on the front and back of the cloth at the same time, and comprises:

[0006] A coating device for simultaneously performing plasma deposition coating on both sides of a fabric, the coating device comprising two PECVD mechanisms symmetrically arranged in an upper and lower manner, the PECVD mechanism comprising a gas distribution box, an electrode member and a support frame, the gas distribution box being a hollow structure, the hollow structure forming a gas source cavity, the gas distribution box being provided with an air inlet passage connected to the gas source cavity for introducing process gas, the bottom of the gas distribution box being a conductive structure, the bottom of the gas distribution box being penetrated by a plurality of through holes; the support frame being an insulating structure, the support frame being connected to the bottom of the gas distribution box; the electrode member being a grid structure, the electrode member being connected in the support frame, the bottom of the gas distribution box being connected by a The support frame and the electrode member are arranged in parallel and face to face with each other at a certain distance. The bottom of the gas distribution box is insulated from the electrode member by the support frame. The distance between the bottom of the gas distribution box and the electrode member forms an ionization glow zone for ionization of process gas. The gas source chamber is connected with the ionization glow zone through the through hole. The support frames of the two PECVD mechanisms are connected to form a connecting member. The two support frames are connected to each other so that there is a certain gap between the two electrode members. The gap forms a deposition chamber. The ionization glow zone is connected with the deposition chamber through a grid structure. The connecting member is facing the deposition chamber and penetrates through the deposition chamber to provide a through hole for the cloth to pass through the deposition chamber.

[0007] The connecting piece is provided with an air extraction hole for connecting with an external air extraction device, and the air extraction hole is connected with the deposition chamber;

[0008] A power source, wherein the bottom of the gas distribution box and the electrode member are electrically connected to two poles of the power source respectively;

[0009] A pre-tightening device, the pre-tightening device comprises a first conveying member and a pre-tightening roller group, the first conveying member has a first conveying surface facing the through-hole and used for carrying the flat cloth, the pre-tightening roller group comprises an upper pre-tightening roller and a lower pre-tightening roller both of which are rotatably arranged, the upper pre-tightening roller is arranged directly above the lower pre-tightening roller and the two are arranged tangentially, the upper pre-tightening roller and / or the lower pre-tightening roller have a first elastic structural layer of a certain thickness on the surface; the end of the first conveying surface is butted against the tangent point of the upper pre-tightening roller and the lower pre-tightening roller;

[0010] A traction device, the traction device comprises a second conveying member and a transmission roller group, the second conveying member has a second conveying surface facing the through hole and used for carrying the flat cloth, the transmission roller group comprises an active roller, a driving assembly and a driven roller, the driving assembly is connected to the active roller and drives the active roller to rotate, the driven roller is arranged to rotate and is tangent to the active roller, the driven roller is arranged directly above the active roller, the active roller and / or the driven roller have a second elastic structural layer of a certain thickness on the surface; the starting end of the second conveying surface butts against the tangent point of the active roller and the driven roller;

[0011] The first conveying surface, the tangent point of the upper pre-tightening roller and the lower pre-tightening roller, the through-port, the tangent point of the active roller and the driven roller, and the second conveying surface are located on the same straight line.

[0012] Compared with the prior art, the present invention needs to perform a material threading operation on the cloth before implementation. The starting end of the cloth is flatly laid from the first conveying surface of the first conveying member through the upper pre-tightening roller and the lower pre-tightening roller of the pre-tightening device, and then horizontally penetrates through the opening of the connecting member of the coating device. After passing through the opening, it passes through the active roller and the driven roller of the traction device and is flatly carried on the second conveying surface of the second conveying member; although the upper pre-tightening roller and the lower pre-tightening roller of the present invention are arranged tangently, since the surface of the upper pre-tightening roller and / or the lower pre-tightening roller has a first structural layer with a certain thickness and elasticity, the cloth can be passed between the upper pre-tightening roller and the lower pre-tightening roller by squeezing the first structural layer; similarly, the active roller and the driven roller of the present invention are tangent, but the surface of the active roller and / or the driven roller has a second structural layer with a certain thickness and elasticity. Since the present invention adopts a PECVD mechanism for precipitation coating to form a coating layer, the cloth can be passed between the active roller and the driven roller by squeezing the second structural layer. Therefore, the thickness of the coating layer is at the nanometer level, which will not affect the overall thickness of the fabric, so the coated fabric can squeeze the second structural layer and pass through the active roller and the driven roller. After completing the above-mentioned threading operation, the coating device and the traction device are started, so that plasma is generated in the deposition chamber of the coating device, so that the driving component drives the active roller to rotate; specifically, the rotation of the active roller causes the fabric to continuously pass through the deposition chamber through friction and the cooperation of the driven roller; at the same time, the fabric in the deposition chamber is uniformly deposited on the front and back surfaces under the action of plasma to form a coating layer; therefore, the coating layer is deposited on both the front and back surfaces of the fabric conveyed from the second conveying surface. In the entire coating process, the utility model uses the upper pre-tightening roller and the lower pre-tightening roller of the pre-tightening device to clamp and convey the fabric, so that when the traction device is pulling the fabric, the fabric is always clamped by the pre-tightening device for transmission, so that the fabric is in a tight state during the entire deposition coating process, ensuring the uniform speed of the fabric during the deposition coating process, and thus ensuring the uniformity of the coating layer on the fabric. The utility model uses two symmetrically arranged PECVD mechanisms to deposit coatings on the front and back sides of the fabric at the same time, which not only ensures the stability of the coating layer adhesion, but also further ensures the uniformity and consistency of the coating layers on the front and back sides, thereby effectively ensuring the functional stability and consistency of the double-sided coated fabric produced by the utility model. The physical and chemical properties of the coated fabric maintain the original mechanical properties while also adding special functions corresponding to the coating layer material. Therefore, the double-sided coated fabric produced by the front and back coating equipment of the utility model can achieve the expected effect, and the physical and chemical properties add new functions on the basis of maintaining the original mechanical properties, and the added new functions are the functions corresponding to the coating layer material.

[0013] Preferably, in the cloth front and back coating device of the present invention, a plug hole is provided on the support frame corresponding to the grid structure of the electrode member, and the electrode member is detachably inserted into the plug hole.

[0014] Preferably, in the fabric front and back coating device of the present invention, the electrode member includes a conductive strip and an electrode strip, the electrode strips are equidistantly and parallelly connected to the conductive strips, the electrode strips are equidistantly arranged to form the grid structure, and the free ends of the electrode strips are detachably inserted into the sockets.

[0015] Preferably, in the cloth front and back surface coating device of the present invention, the first conveying member is a roller structure arranged side by side.

[0016] Preferably, in the cloth front and back surface coating device of the present invention, the second conveying member is a roller structure arranged side by side.

[0017] Preferably, in the cloth front and back surface coating equipment of the present invention, the first conveying surface, the tangent point of the upper pre-tensioning roller and the lower pre-tensioning roller, the through-port, the tangent point of the active roller and the driven roller, and the second conveying surface are located on the same horizontal straight line. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the structure of the front and back surface coating equipment of the cloth.

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the coating device of the utility model along the cloth transmission direction.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the coating device of the utility model along a vertical line of the cloth transmission direction.

[0021] Figure 4 It is a structural schematic diagram of the PECVD mechanism of the utility model.

[0022] Figure 5 yes Figure 4 Schematic diagram of the decomposition structure.

[0023] Figure 6 It is a schematic diagram of an equivalent structure formed by an ionized glow zone and a deposition cavity in the coating device of the utility model. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present application in conjunction with specific implementation examples and the accompanying drawings, and the technical solutions of the utility model are explained. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are explained to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below. Now, embodiments of the utility model are described with reference to the accompanying drawings, and similar component numbers in the accompanying drawings represent similar components.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] like Figure 1 As shown, the fabric front and back coating device 100 of the present invention is used to deposit coating on the front and back of the fabric simultaneously, so that the physical and chemical properties of the fabric are enhanced with new functions while maintaining the original mechanical properties. The enhanced new functions are the functions corresponding to the film layer materials.

[0027] like Figure 1 - Figure 6As shown, the front and back surface coating equipment 1 of the fabric of the present invention comprises a coating device 11 for simultaneously performing plasma deposition coating on both sides of the fabric, and the coating device 11 comprises two PECVD mechanisms 12 symmetrically arranged up and down. The PECVD mechanism 12 of the present invention comprises a gas distribution box 13, an electrode member 14 and a support frame 15. The gas distribution box 13 of the present invention is a hollow structure, and the hollow structure of the gas distribution box 13 forms a gas source chamber 16. The gas distribution box 13 of the present invention is provided with an air inlet channel 17 connected to the gas source chamber 16 for the passage of process gas; the process gas is provided from the outside. Specifically, according to the required function, those skilled in the art can select a process gas corresponding to the required function from the existing process gases without any creative labor, and use it as the process gas for PECVD deposition coating. The bottom 131 of the gas distribution box 13 of the utility model is a conductive structure, and a plurality of through holes 132 are formed through the bottom 131 of the gas distribution box 13. Since the through holes 132 are formed through the bottom 131 of the gas distribution box 13, the through holes 132 are connected to the gas source chamber 16. The support frame 15 of the utility model is an insulating structure, and the support frame 15 is fixedly connected to the bottom 131 of the gas distribution box 13. The electrode member 14 of the utility model is a grid structure, and the electrode member 14 is connected to the support frame 15. The bottom 131 of the gas distribution box 13 of the utility model is arranged parallel to the electrode member 14 at a certain distance from the support frame 15. Since the support frame 15 is an insulating structure and the electrode member 14 is arranged in the support frame 15, the bottom 131 of the gas distribution box 13 of the utility model is insulated from the electrode member 14 by the support frame 15. The distance between the bottom 131 of the gas distribution box 13 of the utility model and the electrode member 14 forms an ionized glow zone 2 for ionizing the process gas. The gas source chamber 16 of the utility model is connected to the ionized glow zone 2 via the through hole 132 on the bottom 131 of the gas distribution box 13. The support frames 15 of the two PECVD mechanisms 12 of the utility model are butt-jointed to form a connector 3; specifically, the connector 3 forms an integrated structure by butt-jointing and fixing the two support frames 15. The two support frames 15 are butt-jointed to form a certain gap between the electrode members 14 of the two PECVD mechanisms 12, and the gap forms a deposition chamber 4 for the cloth 100 to pass through and perform PECVD deposition coating. The ionization glow zone 2 of the utility model is connected with the deposition chamber 4 through the grid structure of the electrode member 14. The well-known grid structure has a gap 14a, so the ionization glow zone 2 of the utility model is connected with the deposition chamber 4 through the gap 14a of the grid structure 14 of the electrode member 14; the connecting member 3 is provided with a through hole 31 for the cloth 100 to pass through the deposition chamber 4 horizontally. The connecting member 3 of the utility model is provided with an exhaust hole 32 for communicating with an external exhaust device, and the exhaust hole 32 is connected with the deposition chamber 4.The utility model further comprises a power source 5 for ionizing the process gas, and the bottom 131 of the gas distribution box 13 and the electrode member 14 are electrically connected to the two poles of the power source 5 respectively. Figure 6 An embodiment is provided in which each PECVD mechanism 12 independently corresponds to a power source 5 ; in the present invention, two PECVD mechanisms 12 may also share a power source 5 .

[0028] like Figure 1 As shown, the present invention further includes a pre-tensioning device 6 for providing pre-tensioning force for the transmission of the cloth 100 during the entire deposition coating process. The pre-tensioning device 6 of the present invention includes a first conveying member 61 and a pre-tensioning roller group 62. The first conveying member 61 has a first conveying surface 611 facing the through-hole 31 and used to carry the flat cloth. The pre-tensioning roller group 62 of the present invention includes an upper pre-tensioning roller 621 and a lower pre-tensioning roller 622, both of which are arranged to rotate. Specifically, the pre-tensioning roller group 62 of the present invention is preferably provided with two groups of upper pre-tensioning rollers 621 and lower pre-tensioning rollers 622 that are independent of each other. The upper pre-tensioning roller 621 in the same group is arranged directly above the lower pre-tensioning roller 622 and the two are arranged tangentially. The outer surface of the upper pre-tensioning roller 621 and / or the lower pre-tensioning roller 622 of the present invention has a first structural layer 623 with a certain thickness and elasticity; preferably, the upper pre-tensioning roller 621 and the lower pre-tensioning roller 622 of the present invention both have the first structural layer 623. The end of the first conveying surface 611 of the first conveying member 61 of the present invention is butted against the tangent point between the upper pre-tightening roller 621 and the lower pre-tightening roller 622 .

[0029] like Figure 1 As shown, the utility model also includes a traction device 7 for providing traction force for the transmission of the cloth 100 during the whole deposition coating process. The traction device 7 of the utility model includes a second conveying member 71 and a transmission roller group 72. The second conveying member 71 has a second conveying surface 711 facing the through hole 31 and used to carry the flat cloth. The transmission roller group 72 of the utility model includes an active roller 721, a driving component and a driven roller 722. The driving component is connected to the active roller 721 and drives the active roller to rotate 721; specifically, the driving component adopts the existing belt type, chain type or gear type drive structure. The driven roller 722 of the utility model is set to rotate and is tangent to the active roller 721. The driven roller 722 of the utility model is arranged directly above the active roller 721. The surface of the active roller 721 and / or the driven roller 722 of the utility model has a second structural layer 723 with a certain thickness and elasticity. The starting end of the second conveying surface 711 of the present invention butts against the tangent point between the active roller 721 and the driven roller 722 ; preferably, the surfaces of the active roller 721 and the driven roller 722 of the present invention both have a second structural layer 723 .

[0030] like Figure 1As shown, the first conveying surface 611, the tangent point of the upper preload roller 621 and the lower preload roller 622, the through hole 31, the tangent point of the active roller 721 and the driven roller 722, and the second conveying surface 711 of the utility model are located on the same straight line. Figure 1 - Figure 6 As shown, before the implementation of the utility model, the cloth 100 needs to be threaded, and the starting end of the cloth 100 is flatly laid from the first conveying surface 611 of the first conveying member 61 through the position A between the upper pre-tightening roller 621 and the lower pre-tightening roller 622 of the pre-tightening device 6, and then horizontally penetrates through the opening 31 of the connecting member 3 of the coating device 11, and then passes through the position B between the active roller 721 and the driven roller 722 of the traction device 7 after passing through the opening 31 and is carried on the second conveying surface 711 of the second conveying member 71 in a flat manner; although the upper pre-tightening roller 621 and the lower pre-tightening roller 622 of the utility model are tangent to each other, However, since the upper pre-tension roller 621 and the lower pre-tension roller 622 have a first elastic structure layer 623 of a certain thickness on their surfaces, the cloth 100 can pass through the position A between the upper pre-tension roller 621 and the lower pre-tension roller 622 by squeezing the first structure layer 623; similarly, the active roller 721 of the utility model is tangent to the driven roller 722, but the active roller 721 and the driven roller 722 have a second elastic structure layer 723 of a certain thickness on their surfaces, so the cloth 100 can pass through the position B between the active roller 721 and the driven roller 722 by squeezing the second structure layer 723. Since the utility model adopts the PECVD mechanism 12 to perform precipitation coating to form the coating layer, the thickness of the coating layer is at the nanometer level and will not affect the overall thickness of the cloth 100, so the coated cloth 100 can also pass through the active roller 721 and the driven roller 722 by squeezing the second structure layer 723. After the above-mentioned threading operation is completed, the coating device 11 and the traction device 7 are started, so that plasma is generated in the deposition chamber 4 of the coating device 11, so that the driving component drives the active roller 721 to rotate; specifically, the rotation of the active roller 721 causes the cloth 100 to move along the Figure 1 and Figure 2The direction of the arrow V shown in the figure continuously passes through the deposition chamber 4; at the same time, the cloth 100 in the deposition chamber 4 is uniformly deposited on the front and back surfaces under the action of plasma to form a coating layer; therefore, the coating layer 200 is deposited on the front and back surfaces of the cloth 100 conveyed from the second conveying surface 711. In the whole coating process, the upper pre-tightening roller 621 and the lower pre-tightening roller 622 of the pre-tightening device 6 are used to clamp and convey the cloth 100, so that when the traction device 7 is pulling the cloth 100, the cloth 100 is always in the clamping of the pre-tightening device 6 for transmission, so that the cloth 100 is in a tight state during the whole deposition coating process, ensuring the uniform speed of the cloth 100 during the deposition coating process, and thus ensuring the uniformity of the coating layer 200 on the cloth 100. The present invention uses two symmetrically arranged PECVD mechanisms 12 to deposit and coat the front and back sides of the fabric 100 at the same time, which not only ensures the stability of the coating layer 200 adhesion, but also further ensures the uniformity and consistency of the coating layer 200 on the front and back sides, thereby effectively ensuring the functional stability and consistency of the double-sided coated fabric 100 produced by the present invention. The physical and chemical properties of the coated fabric 100 maintain the original mechanical properties while also adding special functions corresponding to the coating layer 200 material. Therefore, the double-sided coated fabric 100 produced by the fabric front and back coating equipment of the present invention can achieve the expected effect, and the physical and chemical properties add new functions on the basis of maintaining the original mechanical properties, and the added new functions are the functions corresponding to the coating layer 200 material.

[0031] like Figure 2 - Figure 5 As shown, specifically, a socket 151 is provided on the support frame 15 of the utility model corresponding to the grid structure of the electrode member 14, and the electrode member 14 is detachably inserted into the socket 151. The cooperation between the two is achieved by providing the socket 151 for inserting the grid structure of the electrode member 14 on the support frame 15, so that the electrode member 14 can be detachably installed in the support frame 15, and the installation efficiency and the convenience of maintenance and repair are also improved, and the practicality is strong. More specifically, the electrode member 14 of the utility model includes a conductive strip 141 and an electrode strip 142, and the electrode strips 142 are connected to the conductive strip 141 at equal intervals and in parallel, and the equal intervals between the electrode strips 142 form the grid structure, and the free end of the electrode strip 142 is detachably inserted into the socket 151 of the support frame 15. Furthermore, in order to facilitate the operation of inserting the electrode bar 142 into the socket 151, the conductive strip 141 protrudes outwardly with a graspable bump 143, and by grasping the bump 143, the grid structure electrode bar 142 can be quickly and conveniently inserted into the socket 151 or pulled out from the socket 151.

[0032] like Figure 1 As shown, specifically, the first conveying member 61 of the utility model is a roller structure arranged side by side. The second conveying member 71 of the utility model is a roller structure arranged side by side. The first conveying member 61 and the second conveying member 71 using the roller structure can more stably transport the cloth; further, the roller structure and size used by the first conveying member 61 and the second conveying member 71 are exactly the same.

[0033] like Figure 1 As shown, in order to better transport and deposit coating on the cloth 100, the first conveying surface 611 of the utility model, the tangent point between the upper pre-tensioning roller 621 and the lower pre-tensioning roller 622, the through opening 31, the tangent point between the active roller 721 and the driven roller 722 and the second conveying surface 711 are located on the same horizontal straight line.

[0034] The working principle of PECVD (i.e., plasma enhanced chemical vapor deposition) involved in the present invention is well known to those skilled in the art and will not be described in detail herein.

[0035] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model. Any figure mark in the claims should not be regarded as limiting the claims involved. At the same time, what is disclosed above is only the preferred embodiment of the utility model, and of course it cannot be used to limit the scope of rights of the utility model. Therefore, equivalent changes made according to the scope of the patent application of the utility model are still within the scope covered by the utility model.

Claims

1. A fabric front and back coating device, used for depositing coating on the front and back of fabric simultaneously, characterized in that: include: A coating device for simultaneously performing plasma deposition coating on both sides of a fabric, the coating device comprising two PECVD mechanisms symmetrically arranged in an upper and lower manner, the PECVD mechanism comprising a gas distribution box, an electrode member and a support frame, the gas distribution box being a hollow structure, the hollow structure forming a gas source cavity, the gas distribution box being provided with an air inlet passage connected to the gas source cavity for introducing process gas, the bottom of the gas distribution box being a conductive structure, the bottom of the gas distribution box being penetrated by a plurality of through holes; the support frame being an insulating structure, the support frame being connected to the bottom of the gas distribution box; the electrode member being a grid structure, the electrode member being connected in the support frame, the bottom of the gas distribution box being connected by a The support frame and the electrode member are arranged in parallel and face to face with each other at a certain distance. The bottom of the gas distribution box is insulated from the electrode member by the support frame. The distance between the bottom of the gas distribution box and the electrode member forms an ionization glow zone for ionization of process gas. The gas source chamber is connected with the ionization glow zone through the through hole. The support frames of the two PECVD mechanisms are connected to form a connecting member. The two support frames are connected to each other so that there is a certain gap between the two electrode members. The gap forms a deposition chamber. The ionization glow zone is connected with the deposition chamber through a grid structure. The connecting member is facing the deposition chamber and penetrates through the deposition chamber to provide a through hole for the cloth to pass through the deposition chamber. The connecting piece is provided with an air extraction hole for connecting with an external air extraction device, and the air extraction hole is connected with the deposition chamber; A power source, wherein the bottom of the gas distribution box and the electrode member are electrically connected to two poles of the power source respectively; A pre-tightening device, the pre-tightening device comprises a first conveying member and a pre-tightening roller group, the first conveying member has a first conveying surface facing the through-hole and used for carrying the flat cloth, the pre-tightening roller group comprises an upper pre-tightening roller and a lower pre-tightening roller both of which are rotatably arranged, the upper pre-tightening roller is arranged directly above the lower pre-tightening roller and the two are arranged tangentially, the upper pre-tightening roller and / or the lower pre-tightening roller have a first elastic structural layer of a certain thickness on the surface; the end of the first conveying surface is butted against the tangent point of the upper pre-tightening roller and the lower pre-tightening roller; A traction device, the traction device comprises a second conveying member and a transmission roller group, the second conveying member has a second conveying surface facing the through hole and used for carrying the flat cloth, the transmission roller group comprises an active roller, a driving assembly and a driven roller, the driving assembly is connected to the active roller and drives the active roller to rotate, the driven roller is arranged to rotate and is tangent to the active roller, the driven roller is arranged directly above the active roller, the active roller and / or the driven roller have a second elastic structural layer of a certain thickness on the surface; the starting end of the second conveying surface butts against the tangent point of the active roller and the driven roller; The first conveying surface, the tangent point of the upper pre-tightening roller and the lower pre-tightening roller, the through-port, the tangent point of the active roller and the driven roller, and the second conveying surface are located on the same straight line.

2. The cloth front and back coating device according to claim 1, characterized in that: The support frame is provided with an insertion hole corresponding to the grid structure of the electrode member, and the electrode member is detachably inserted into the insertion hole.

3. The cloth front and back coating device as claimed in claim 2, characterized in that: The electrode member includes a conductive strip and an electrode strip, wherein the electrode strips are connected to the conductive strip in parallel and at equal intervals, and the electrode strips are arranged at equal intervals to form the grid structure, and the free ends of the electrode strips are detachably inserted into the jacks.

4. The cloth front and back coating device as claimed in claim 1, characterized in that: The first conveying member is a roller structure arranged side by side.

5. The cloth front and back coating device as claimed in claim 1, characterized in that: The second conveying member is a roller structure arranged side by side.

6. The cloth front and back coating device as claimed in claim 1, characterized in that: The first conveying surface, the tangent point between the upper pre-tightening roller and the lower pre-tightening roller, the through opening, the tangent point between the active roller and the driven roller, and the second conveying surface are located on the same horizontal straight line.

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