Liquid coating machine for back coating process and method for preparing special film by using liquid coating machine

Abstract

The invention belongs to the technical field of film back coating processes, and particularly relates to a liquid coating machine for a back coating process and a method for preparing a special film through the liquid coating machine. The liquid coating machine comprises a main machine box, a liquid storage box is fixedly installed at the rear end of the top of the main machine box, the liquid storage box is connected with a quantitative feeding coating roller through a feeding pipe, and the quantitative feeding coating roller comprises a feeding cavity; the feeding cavity is a tubular component composed of two layers of materials, the inner layer of the feeding cavity is tightly wrapped with a screw, the output end of the liquid supply pump motor penetrates through the feeding cavity to be connected with one end of the screw, and the screw is driven by the liquid supply pump motor to achieve rotary feeding. And the screw rod is in close contact with the inner layer of the feeding cavity to form a dynamic sealing structure, then the infiltration liquid is quantitatively conveyed to the spiral space by the liquid supply pump motor according to the rotating speed, and the conveying amount of the infiltration liquid is accurately controlled by controlling the rotating speed of the liquid supply pump motor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of film back-coating process, and particularly relates to a coating liquid machine for back-coating process and a method for preparing special film by using the same. BACKGROUND

[0002] In the preparation of special fiber film materials, some processes need to immerse or apply a formula immersion liquid to the already formed film material in order to promote the subsequent process. In the immersion process, the penetration degree of the immersion liquid into the film material and the uniformity of surface adhesion, especially the uniformity of the front and back surfaces of the material, are the key technologies of this process. Moreover, the mechanical properties of the film material immersed completely in the immersion liquid are poor, or the film material cannot be completely immersed, or the material needs to strictly control the amount of immersion, so a back-coating process is specially added after the front coating to increase the penetration degree of the back surface of the film material and reduce the difference between the front and back surfaces.

[0003] On the traditional back-coating coating equipment, a micro-concave roller or a porous sponge rubber roller is used to quantitatively apply the immersion liquid to the back surface of the film material. However, there are the following problems: the micro-concave roller is a cylindrical rod with continuous and equidistant millimeter-level grooves processed to form a micro-concave structure. The depth and spacing of these grooves are relatively small, and the amount of immersion liquid that can be carried is quite limited. Especially, the micro-concave roller is below the surface to be processed, and the immersion liquid will remain in the groove due to the influence of gravity. During the entire coating process, only the residual immersion liquid in the groove is in contact with the surface to be processed, and the amount of coating mainly depends on the adsorption performance of the surface to be processed or the wettability of the immersion liquid. The uniformity of the coating formed on the surface to be processed depends on the liquid dynamic dispersion ability of the immersion liquid on the surface to be processed and the spacing of the micro-concave grooves. Especially for film materials with poor adsorption capacity or immersion liquids with poor wettability, the micro-concave roller is difficult to achieve the back-coating process, and the uniformity of the limited coating is also affected by the processing precision of the micro-concave grooves. Especially for slow back-coating, a groove-like stripe texture is often formed. The porous sponge rubber roller has a large number of random multi-directional voids, which is better than the micro-concave roller in terms of coating uniformity. However, it also has the problem of insufficient coating amount. Especially when the surface to be processed cannot withstand pressure, a large amount of immersion liquid will remain in the porous sponge rubber roller and cannot be absorbed or replaced. For high-viscosity or quick-drying immersion liquids or gel immersion liquids, the internal replacement is difficult, which can easily cause the internal concentration of the porous sponge rubber roller to rise, and in severe cases, the internal hardness of the porous sponge rubber roller will increase, resulting in a decrease in the absorption capacity of the porous sponge rubber roller, and in severe cases, the roller body will be scrapped. SUMMARY

[0004] The present application provides a coating liquid machine for back coating process and a method for preparing special membranes using the same to solve the problems of uneven back coating and insufficient coating liquid of the immersion liquid in the back coating process of the special fiber membrane.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A coating liquid machine for back coating process, comprising a main machine box, two groups of cantilever pressure roller mechanisms are fixedly installed on the front end of the upper surface of the main machine box, each group of the cantilever pressure roller mechanisms is provided with three cantilever pressure roller components, the three cantilever pressure roller components are arranged in sequence on the main machine box, auxiliary supporting roller mechanisms are fixedly installed on the two side walls of the main machine box, a liquid storage tank is fixedly installed at the rear end of the top of the main machine box, the liquid storage tank is connected with a quantitative feeding coating roller through a feeding pipe, a circulating liquid receiving mechanism is arranged at the lower end of the quantitative feeding coating roller; the quantitative feeding coating roller comprises a feeding cavity, the feeding cavity is a tubular component composed of double-layer materials, a through hole is formed in the cavity wall of the feeding cavity close to the cantilever pressure roller mechanism, the feeding cavity passes through the main machine box and is connected with the liquid storage tank through the feeding pipe, a liquid supply pump motor is fixedly installed on the rear side wall outside the main machine box, a screw is tightly wrapped in the inner layer of the feeding cavity, the output end of the liquid supply pump motor is connected with one end of the screw through the feeding cavity, and the screw is driven to rotate for feeding by the liquid supply pump motor, a microporous shell layer is arranged on the outer layer of the feeding cavity, the gap between the microporous shell layer and the feeding cavity is L, and L≤0.25mm, a pair of bearings are arranged between the microporous shell layer and the feeding cavity, bearing end covers are arranged at the outer ends of the two bearings, the bearing end covers and the side wall of the microporous shell layer are connected by fastening screws, a first sealing ring is arranged between the bearing end covers and the microporous shell layer, ceramic rubber composite sealing rings are arranged at the inner ends of the two bearings, and the lower part of the microporous shell layer is immersed in the circulating liquid receiving mechanism.

[0007] Further, the cantilever pressure roller component comprises a pressure roller motor, the housing of the pressure roller motor is fixedly installed on the upper surface of the main machine box, a lift is fixedly installed at the lower end of the pressure roller motor through the main machine box, a first lock is arranged on the lift, feed-in pressure rollers, positive pressure rollers and discharge pressure rollers are sequentially installed at the lower ends of the three lifts from left to right, the contact area between the microporous shell layer and the material is controlled by adjusting the contact included angle between the pressure roller motor and the lower end microporous shell layer, a plurality of first pressure sensors are fixedly installed on the positive pressure rollers, the plurality of first pressure sensors are wirelessly connected with the first lock of the positive pressure rollers, when the pressure value reaches the preset value, the first lock locks the lift corresponding to the positive pressure roller, so that the positive pressure roller contacts with the microporous shell layer.

[0008] Further, the auxiliary roller mechanism comprises a driving motor and a horizontal telescopic member, the housing of the driving motor is fixedly installed on the rear side wall outside the main box, the output shaft of the driving motor is fixedly connected with a first pulley through the rear side wall of the main box, the housing of the horizontal telescopic member is fixedly installed on the side wall of the main box, a second locker is fixedly installed on the horizontal telescopic member, the horizontal telescopic member passes through the side wall of the main box and is hingedly connected with a rubber roller at one end close to the microporous shell layer, the rubber roller is in contact with the lower part of the side edge of the microporous shell layer, and the lower part of the rubber roller is immersed in the circulating liquid receiving mechanism, a sliding groove is formed in the main box, one end of the rubber roller shaft is slidably connected in the sliding groove, a second pulley is fixedly installed on the other end of the rubber roller shaft extending into the main box, the first pulley and the second pulley are connected through a synchronous belt to realize transmission, a plurality of sliding grooves are formed in the side wall of the main box, the shafts of the second pulleys are correspondingly arranged in the sliding grooves, a transition wheel is arranged on the synchronous belt, the support of the transition wheel is fixedly installed on the inner wall of the main box, a tension pulley is arranged between the transition wheel and the second pulley, the frame of the tension pulley is fixedly installed on the inner wall of the main box, a spring is arranged in the frame of the tension pulley, and the tension of the spring is adjusted by the tension of the synchronous belt.

[0009] Further, the circulating liquid receiving mechanism comprises a liquid receiving tray, a liquid inlet is arranged at one end of the lower surface of the liquid receiving tray, the liquid inlet is connected with one end of a liquid inlet pipeline, the other end of the liquid inlet pipeline is fixedly connected with a water inlet of a circulating liquid tank, a water outlet of the circulating liquid tank is connected with one end of a backflow pipeline, the other end of the backflow pipeline is fixedly connected with a liquid outlet at the other end of the liquid receiving tray, a circulating pump is installed between the water outlet and the backflow pipeline, the circulating pump regulates the flow of the infiltrating liquid flowing into the liquid receiving tray, and the lower part of the microporous shell layer is immersed in the liquid receiving tray together with the lower part of the rubber roller.

[0010] Further, a plurality of second pressure sensors are fixedly installed at the position where the rubber roller is in contact with the microporous shell layer, the second pressure sensors are used for monitoring the pressure between the rubber roller and the microporous shell layer, and the second pressure sensors are wirelessly connected with the second locker.

[0011] Further, the microporous shell layer is a stainless steel pipe polished inside and outside, a plurality of micro-pipes are arranged on the microporous shell layer and are uniformly distributed in a circle with the microporous shell layer as the center, and a circular arc spherical groove is arranged at the outer end of the micro-pipe.

[0012] Further, a liquid supply valve is arranged on the liquid supply pipeline, and the liquid supply valve regulates the flow of the infiltrating liquid flowing into the quantitative liquid supply coating roller.

[0013] Further, the ceramic rubber composite sealing ring comprises two tooth-shaped ceramics, and elastic rubber is arranged between the two tooth-shaped ceramics, the elastic rubber provides supporting force through deformation, and ensures that the two tooth-shaped ceramics can tightly fit the micro-porous shell layer and the feeding cavity.

[0014] A coating liquid machine for back coating process and a method for preparing a special film using the same,

[0015] Step one: clean the liquid storage tank, liquid receiving tray and connecting pipeline to ensure that there is no residual impurity; check whether the micro-porous shell surface micro-pipe is unobstructed, without blockage or damage; calibrate the parallelism of the rubber supporting roller, the positive pressure roller, the feeding pressure roller and the discharging pressure roller to ensure that the roller surface spacing error is less than or equal to 0.1mm; prepare the immersion liquid according to the characteristics of the special film material, and inject it into the liquid storage tank; at the same time, add solvent in the circulating liquid tank for system preheating and circulation;

[0016] Step two: manually open the liquid supply valve, the immersion liquid in the liquid storage tank fills the liquid supply pump motor through the pipeline, then open the circulating pump, the low concentration or concentration up to standard immersion liquid in the circulating liquid tank fills the liquid receiving tray, and the liquid circulation is realized through the liquid inlet and liquid outlet of the liquid receiving tray; start the liquid supply pump motor at a slow speed, let the immersion liquid fill the screw and discharge the air in the quantitative feeding coating roller, and the rotating speed of the liquid supply pump motor is set to 50-100r / min;

[0017] Step three: simultaneously open the driving motor to drive the rotation of the first pulley, the second pulley and the rubber supporting roller, and operate the horizontal telescopic member to move the rubber supporting roller shaft in the sliding groove to contact the micro-porous shell layer, and the second pressure sensor detects the pressure value between the auxiliary supporting roller and the micro-porous shell layer, the pressure value is set to 0.1-0.3MPa, when the pressure value reaches the preset value, the second locker locks the auxiliary supporting roller, in this process, the immersion liquid is continuously delivered to the micro-pipe through the through hole, and the immersion liquid forms countless liquid drops above the micro-pipe to form an immersion area;

[0018] Step four: finally control the pressure roller motor drive adjustment three elevators, adjust the height of the feed pressure roller, positive pressure roller and discharge pressure roller, so that the material passes through at the same time, then start the corresponding pressure roller motor and elevator of the positive pressure roller, the positive pressure roller is in contact with the lower end of the microporous shell layer, and the pressure value between the positive pressure roller and the microporous shell layer is detected by a pressure sensor, the pressure value is set to 0.2-0.5MPa, when the preset value is reached, the elevator is locked by the first locker, then the height of the feed pressure roller and the discharge pressure roller is adjusted by the elevator, so that the feed pressure roller and the discharge pressure roller contact the material and continue to descend, the linear speed of the feed pressure roller, the positive pressure roller and the discharge pressure roller is consistent, and the error is controlled within ±0.5m / min, so that the material and the microporous shell layer form an included angle, the included angle is 30°-60°, the first locker locks the feed pressure roller and the discharge pressure roller, and finally the rotation speed of the liquid supply pump motor is adjusted, at this time the rotation speed of the liquid supply pump motor is set to 100-500r / min, so that it realizes continuous operation after reaching the back coating amount of 10-100g / m².

[0019] Step five: first, stop the liquid supply pump motor and stop supplying liquid; after the residual infiltration liquid on the microporous shell layer is consumed, stop the drive mechanism of the rubber backup roller and each pressure roller in turn; finally, close the circulating pump and the liquid supply valve. Flush the liquid storage tank, connecting pipeline and microporous shell layer with solvent to remove residual infiltration liquid; check whether the microtubes are blocked, and if necessary, use high-pressure gas to blow and dredge.

[0020] Further, the deformation rate of the rubber backup roller is set to 1%-5%, and the liquid flow in the liquid receiving tray is 5-10L / min.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. The feeding cavity of the present application is composed of double-layer materials, and the screw is in close contact with the inner layer of the feeding cavity to form a dynamic sealing structure. The liquid supply pump motor delivers the infiltration liquid to the spiral space according to the rotation speed, and the rotation speed of the liquid supply pump motor is controlled to accurately control the delivery amount of the infiltration liquid.

[0023] 2. The infiltration liquid in the present application continuously flows out through the through hole of the feeding cavity and passes through the continuously rotating microporous shell layer. A plurality of microtubes are arranged on the microporous shell layer, and the plurality of microtubes are uniformly distributed in a circle. The flow pressure of the infiltration liquid formed by the outlet of the microtube can effectively force the infiltration liquid to fill the through hole and overflow uniformly. The outer end of the microtube is provided with a circular arc spherical groove, which can effectively reduce the hydrophilic contact angle of the overflowed infiltration liquid droplets, so that the infiltration liquid droplets on the outside of the microporous shell layer are quickly connected into a sheet to form a uniform infiltration area, the amount of the material back and the infiltration liquid is increased, the liquid coating amount is increased, the phenomenon of local point-like high concentration after the material contacts is avoided, and the uniformity of the material back coating is improved.

[0024] 3. The feed pressure roller, positive pressure roller and discharge pressure roller in the present invention ensure the contact strength between the material and the quantitative feeding coating roller. By adjusting the height of the feed pressure roller and the discharge pressure roller, the contact angle and contact area between the material and the quantitative feeding coating roller can be adjusted, thereby quantitatively controlling the coating amount of the wetting liquid.

[0025] 4. The present invention drives the No. 1 pulley, the No. 2 pulley and the auxiliary roller to rotate through a driving motor, and then the auxiliary roller drives the microporous shell and the material inside the microporous shell to rotate at the same speed. The internal transmission adopts a synchronous belt, and the structure is simple and easy to implement.

[0026] 5. The lower part of the microporous shell layer and the lower part of the auxiliary roller of the present invention are immersed in the liquid receiving tray. The low-concentration or equal-concentration infiltration liquid in the liquid receiving tray has a cleaning effect on the microporous shell layer and the auxiliary roller, which is especially practical for the infiltration liquid with an adhesive effect. The circulating liquid receiving mechanism can receive the remaining infiltration liquid on the microporous shell layer and the auxiliary roller and reuse it through a circulating pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 is a side view of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the cantilever pressure roller component and the quantitative feeding coating roller of the present invention;

[0030] Figure 4 This is a schematic structural diagram of the quantitative feeding coating roller of the present invention;

[0031] Figure 5 Schematic diagram of the structure of the microporous shell layer of the present invention;

[0032] Figure 6 Schematic diagram of the structure of the microporous shell and the feeding cavity of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the rubber roller transmission of the present invention;

[0034] In the figure, the main box 1, cantilever pressure roller mechanism 2, cantilever pressure roller component 3, auxiliary roller mechanism 4, liquid storage tank 5, feed pipe 6, quantitative feed coating roller 7, circulating liquid receiving mechanism 8, feed cavity 9, through hole 10, liquid supply pump motor 11, screw 12, microporous shell layer 13, bearing 14, bearing end cover 15, No. 1 sealing ring 16, ceramic rubber composite sealing ring 17, pressure roller motor 18, elevator 19, No. 1 locker 20, feed pressure roller 21, positive pressure roller 22, discharge pressure roller 23, No. 1 pressure sensor 24, drive motor 25, horizontal telescopic component 26, No. 1 pulley 27, No. 2 locker 28, rubber roller 29, No. 2 pulley 30, synchronous belt 31, chute 32, transition wheel 33, tension wheel 34, liquid receiving tray 35, liquid inlet 36, liquid inlet pipeline 37, circulating liquid tank 38, water inlet 39, water outlet 40, return pipeline 41, liquid outlet 42, circulating pump 43, No. 2 pressure sensor 44, micro tube 45, circular arc spherical recess 46, liquid supply valve 47, toothed ceramic 48, elastic rubber 49. DETAILED DESCRIPTION

[0035] In order to further illustrate the technical scheme of the present application, the present application will be further described below through examples.

[0036] Example 1

[0037] As Figure 1 With Figure 2As shown, a back coating process with a coating liquid machine, including the main box 1, the front end of the upper surface of the main box 1 is fixedly installed with two groups of cantilever pressure roller mechanism 2, each group of cantilever pressure roller mechanism 2 is provided with three cantilever pressure roller components 3, three cantilever pressure roller components 3 are arranged in sequence on the main box 1, the cantilever pressure roller component 3 includes a pressure roller motor 18, the shell of the pressure roller motor 18 is fixedly installed on the upper surface of the main box 1, the lower end of the pressure roller motor 18 is fixedly installed with a lift 19 through the main box 1, a locking device 20 is arranged on the lift 19, the lower end of the three lifts 19 is sequentially installed into the feed roller 21, the positive roller 22 and the discharge roller 23 from left to right, the pressure roller motor 18 respectively adjusts the lift 19 in turn to adjust the contact angle size between the feed roller 21, the positive roller 22 and the discharge roller 23 and the lower end of the microporous shell layer 13 to control the contact area between the microporous shell layer 13 and the material, a plurality of first pressure sensors 24 are fixedly installed on the positive roller 22, a plurality of first pressure sensors 24 are wirelessly connected with the first locking device 20 of the positive roller 22, when the pressure value reaches the preset value, the first locking device 20 locks the corresponding lift 19 of the positive roller 22, so that the positive roller 22 contacts with the microporous shell layer 13, the auxiliary supporting roller mechanism 4 is fixedly installed on the both side walls of the main box 1, the liquid storage tank 5 is fixedly installed on the rear end of the top of the main box 1, the liquid storage tank 5 is connected with the quantitative feeding coating roller 7 through the feeding pipe 6, the feeding pipe 6 is provided with a liquid supply valve 47, the liquid supply valve 47 controls the flow of the infiltration liquid flowing into the quantitative feeding coating roller 7, the lower end of the quantitative feeding coating roller 7 is provided with a circulating liquid receiving mechanism 8, the circulating liquid receiving mechanism 8 includes a liquid receiving tray 35, an inlet 36 is arranged at one end of the lower surface of the liquid receiving tray 35, the inlet 36 is connected with one end of the liquid inlet pipeline 37, the other end of the liquid inlet pipeline 37 is fixedly connected with the water inlet 39 of the circulating liquid tank 38, the water outlet 40 of the circulating liquid tank 38 is connected with one end of the backflow pipeline 41, the other end of the backflow pipeline 41 is fixedly connected with the liquid outlet 42 of the other end of the liquid receiving tray 35, the circulating pump 43 is installed between the water outlet 40 and the backflow pipeline 41, the circulating pump 43 controls the flow of the infiltration liquid flowing into the liquid receiving tray 35, the lower part of the microporous shell layer 13 and the lower part of the rubber supporting roller 29 are immersed in the liquid receiving tray 35.

[0038] As Figure 4 With Figure 6As shown, the quantitative feeding coating roller 7 comprises a feeding cavity 9 which is a tubular member composed of double layers of materials, and the feeding cavity 9 is provided with a through hole 10 on the cavity wall close to the cantilever pressure roller mechanism 2, and the feeding cavity 9 is connected with the liquid storage tank 5 through the feeding pipe 6 passing through the main machine box 1, and a liquid supply pump motor 11 is fixedly installed on the rear side wall outside the main machine box 1, and the inner layer of the feeding cavity 9 is tightly wrapped with a screw rod 12, and the output end of the liquid supply pump motor 11 is connected with one end of the screw rod 12 through the feeding cavity 9, and the screw rod 12 is driven to rotate for feeding by the liquid supply pump motor 11, and the outer layer of the feeding cavity 9 is provided with a microporous shell layer 13, and the gap therebetween is L, and L≤0.25mm, and a pair of bearings 14 are arranged between the microporous shell layer 13 and the feeding cavity 9, and the outer ends of the two bearings 14 are provided with bearing end covers 15, and the bearing end covers 15 and the side wall of the microporous shell layer 13 are connected by fastening screws, and a first sealing ring 16 is arranged between the bearing end cover 15 and the microporous shell layer 13, and ceramic rubber composite sealing rings 17 are respectively arranged at the inner ends of the two bearings 14, and the lower part of the microporous shell layer 13 is immersed in the circulating liquid receiving mechanism 8.

[0039] As Figure 1 , Figure 2 , Figure 3 With Figure 7 As shown, the auxiliary supporting roller mechanism 4 comprises a driving motor 25 and a horizontal telescopic member 26, the housing of the driving motor 25 is fixedly installed on the rear side wall outside the main machine box 1, the output shaft of the driving motor 25 is fixedly connected with a first belt pulley 27 through the rear side wall of the main machine box 1, the housing of the horizontal telescopic member 26 is fixedly installed with the side wall of the main machine box 1, a second locking device 28 is fixedly installed on the horizontal telescopic member 26, the horizontal telescopic member 26 passes through the side wall of the main machine box 1, and a rubber supporting roller 29 is hingedly connected at one end close to the microporous shell layer 13, the rubber supporting roller 29 is in contact with the lower part of the side edge of the microporous shell layer 13, and the lower part of the rubber supporting roller 29 is immersed in the circulating liquid receiving mechanism 8, a sliding groove is formed on the main machine box 1, one end of the shaft of the rubber supporting roller 29 is slidingly connected in the sliding groove, a second belt pulley 30 is fixedly installed on the other end of the shaft of the rubber supporting roller 29 which extends into the main machine box 1, the first belt pulley 27 and the second belt pulley 30 are connected by a synchronous belt 31 to achieve transmission, a group of sliding grooves 32 are formed on the side wall of the main machine box 1, the shafts of the second belt pulleys 30 are respectively corresponding to the sliding grooves 32, a transition wheel 33 is arranged on the synchronous belt 31, the support of the transition wheel 33 is fixedly installed on the inner wall of the main machine box 1, a tension wheel 34 is arranged between the transition wheel 33 and the second belt pulley 30, the frame of the tension wheel 34 is fixedly installed on the inner wall of the main machine box 1, a spring is arranged in the frame of the tension wheel 34, and the tension of the spring of the tension wheel 34 is adjusted by the tension of the synchronous belt 31.

[0040] AsFigure 3 As shown, a plurality of second pressure sensors 44 are fixedly installed at the contact position between the rubber backup roll 29 and the microporous shell layer 13, for monitoring the pressure between the rubber backup roll 29 and the microporous shell layer 13, and the plurality of second pressure sensors 44 are wirelessly connected to the second locker 28.

[0041] As shown in the figure, Figure 5 As shown, the microporous shell layer 13 is an internally and externally polished stainless steel pipe, and a plurality of microtubes 45 are arranged on the microporous shell layer 13 and uniformly distributed in a circle with the microporous shell layer 13 as the center, and a circular arc spherical groove 46 is arranged at the outer end of the microtube 45.

[0042] As shown in the figure, Figure 6 As shown, the ceramic rubber composite sealing ring 17 includes two tooth-shaped ceramics 48, and an elastic rubber 49 is arranged between the two tooth-shaped ceramics 48, which provides support force through deformation to ensure that the two tooth-shaped ceramics can tightly fit the microporous shell layer 13 and the feed cavity 9.

[0043] A coating liquid machine for back coating process and a method for preparing a special film using the same,

[0044] Step one: clean the liquid storage tank 5, the liquid receiving tray 35 and the connecting pipeline to ensure that there is no residual impurity; check whether the microtubes 45 on the surface of the microporous shell layer 13 are unobstructed, without blockage or damage; calibrate the parallelism of the rubber backup roll 29, the positive pressure roll 22, the feed pressure roll 21 and the discharge pressure roll 23 to ensure that the distance error between the roll surfaces is ≤0.1mm; prepare the immersion liquid according to the characteristics of the special film material, and inject it into the liquid storage tank 5; at the same time, add a solvent in the circulating liquid tank 38 for system preheating and circulation;

[0045] Step two: manually open the liquid supply valve 47, and the immersion liquid in the liquid storage tank 5 fills the liquid supply pump motor 11 through the pipeline, then open the circulating pump 43, and the low-concentration or concentration-standard immersion liquid in the circulating liquid tank 38 fills the liquid receiving tray 35, and the liquid circulation is realized through the liquid inlet 36 and the liquid outlet 42 of the liquid receiving tray 35, and the liquid flow in the liquid receiving tray 35 is 5-10L / min; start the liquid supply pump motor 11 at a slow speed, so that the immersion liquid fills the screw 12 and discharges the air in the interior of the quantitative feed coating roll 7, and the rotating speed of the liquid supply pump motor 11 is set to 50-100r / min;

[0046] Step three: simultaneously open the drive motor 25 to drive the rotation of the first pulley 27, the second pulley 30 and the rubber roller 29, the deformation rate of the rubber roller 29 is set to 1%-5%, and the horizontal telescopic member 26 is operated to move the rubber roller shaft in the sliding groove to contact the microporous shell layer 13, and the second pressure sensor 44 detects the pressure value between the auxiliary roller and the microporous shell layer 13, the pressure value is set to 0.1-0.3MPa, when the pressure value reaches the preset value, the second locker 28 locks the auxiliary roller, in this process, the infiltration liquid is continuously delivered to the microporous shell layer 13 through the through hole 10, and the infiltration liquid forms countless liquid drops above the microporous shell layer 13 to form an infiltration area;

[0047] Step four: finally control the pressure roller motor 18 to drive the adjustment of the three elevators 19 to adjust the height of the feeding pressure roller 21, the positive pressure roller 22 and the discharge pressure roller 23, so that the material passes through at the same time, then the corresponding pressure roller motor 18 and the elevator 19 of the positive pressure roller 22 are started, the positive pressure roller 22 is in contact with the lower end microporous shell layer 13, and the pressure value between the positive pressure roller 22 and the microporous shell layer 13 is detected by the first pressure sensor 24, the pressure value is set to 0.2-0.5MPa, when the preset value is reached, the first locker 20 locks the elevator 19, then the height of the feeding pressure roller 21 and the discharge pressure roller 23 is adjusted by the elevator 19, so that the feeding pressure roller 21 and the discharge pressure roller 23 contact the material and continue to descend, the linear speed of the feeding pressure roller 21, the positive pressure roller 22 and the discharge pressure roller 23 is consistent, and the error is controlled within ±0.5m / min, so that the material forms an included angle with the microporous shell layer 13, the included angle range is 30°-60°, the first locker 20 locks the feeding pressure roller 21 and the discharge pressure roller 23, and finally the rotation speed of the liquid supply pump motor 11 is adjusted, at this time the rotation speed of the liquid supply pump motor 11 is set to 100-500r / min, so that it realizes continuous operation after reaching the back coating amount of 10-100g / m²;

[0048] Step five: first, stop the liquid supply pump motor 11 to stop supplying liquid; after the residual infiltration liquid on the microporous shell layer 13 is consumed, the drive mechanism of the rubber roller 29 and each pressure roller is stopped in turn; finally, the circulating pump 43 and the liquid supply valve 47 are closed, and the storage tank 5, the connecting pipeline and the microporous shell layer 13 are flushed with solvent to remove the residual infiltration liquid; check whether the microporous shell layer 13 is blocked, if necessary, use high-pressure gas to blow and dredge.

[0049] Example 2

[0050] The pressure roller motor 18 is replaced by a hand wheel screw structure, and the horizontal telescopic member 26 is replaced by a hand wheel screw structure.

[0051] Example 3

[0052] The elevator 19 is replaced by a pneumatic elevator, and the horizontal telescopic member 26 is replaced by a motor-driven or steam-driven propulsion.

[0053] The foregoing merely illustrates the principles of the application and applies only to the particular cases described and illustrated herein. It will be apparent to those skilled in the art that the application can be practiced with modifications, and that the scope and spirit of the application can be gauged by the contents of the claims and their equivalents.

[0054] Furthermore, it should be understood that although the description above relates to embodiments, not every embodiment contains only one independent technical solution, and the description is only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A liquid coating machine for back coating process, characterized by: The invention comprises a main box (1), wherein two groups of cantilever pressing roller mechanisms (2) are fixedly installed at the front end of the upper surface of the main box (1), each group of the cantilever pressing roller mechanisms (2) is provided with three cantilever pressing roller components (3), and the three cantilever pressing roller components (3) are arranged in sequence on the main box (1), and auxiliary supporting roller mechanisms (4) are fixedly installed on both side walls of the main box (1), and a liquid storage tank (5) is fixedly installed at the rear end of the top of the main box (1), and the liquid storage tank (5) is connected to a quantitative feeding coating roller (7) through a feeding pipe (6), and a circulating liquid receiving mechanism (8) is provided at the lower end of the quantitative feeding coating roller (7); The quantitative feeding coating roller (7) includes a feeding cavity (9), which is a tubular component composed of a double-layer material. A through hole (10) is opened on the cavity wall of the feeding cavity (9) near the cantilever pressure roller mechanism (2). The feeding cavity (9) passes through the main box (1) and is connected to the liquid storage tank (5) through the feeding pipe (6). A liquid supply pump motor (11) is fixedly installed on the rear side wall outside the main box (1). The inner layer of the feeding cavity (9) is slidably connected to a screw (12). The output end of the liquid supply pump motor (11) passes through the feeding cavity (9) and is connected to one end of the screw (12), and the screw (12) is driven by the liquid supply pump motor (11) to realize rotation feeding. The outer layer of the feeding cavity (9) is provided with a microporous shell (13), and the gap between them is L, L≤0.25mm. A pair of bearings (14) are provided between the microporous shell (13) and the feeding cavity (9), and the outer ends of the two bearings (14) are provided with bearing end covers (15). The bearing end covers (15) and the side walls of the microporous shell (13) are connected by fastening screws. A No. 1 sealing ring (16) is provided between the bearing end cover (15) and the microporous shell (13), and the inner ends of the two bearings (14) are respectively provided with ceramic rubber composite sealing rings (17). The lower part of the microporous shell (13) is immersed in the circulating liquid receiving mechanism (8).

2. A back coating liquid coating machine according to claim 1, characterized in that: The cantilever pressure roller component (3) includes a pressure roller motor (18), the housing of the pressure roller motor (18) is fixedly mounted on the upper surface of the main box (1), the lower end of the pressure roller motor (18) passes through the main box (1) and is fixedly mounted with an elevator (19), the elevator (19) is provided with a No. 1 locker (20), the lower ends of the three elevators (19) are sequentially mounted with a feed pressure roller (21), a positive pressure roller (22) and a discharge pressure roller (23) from left to right, and the pressure roller motor (18) drives and adjusts the elevator (19) to adjust the feed pressure roller. (21), the contact angle between the positive pressure roller (22) and the discharge pressure roller (23) and the lower end microporous shell (13) is used to control the contact area between the microporous shell (13) and the material, and a plurality of No. 1 pressure sensors (24) are fixedly installed on the positive pressure roller (22), and the plurality of No. 1 pressure sensors (24) are wirelessly connected to the No. 1 locker (20) of the positive pressure roller (22). When the pressure value reaches a preset value, the No. 1 locker (20) locks the elevator (19) corresponding to the positive pressure roller (22), so that the positive pressure roller (22) contacts the microporous shell (13).

3. The back coating process coating machine according to claim 1, characterized in that: The auxiliary roller mechanism (4) includes a driving motor (25) and a horizontal telescopic member (26), the housing of the driving motor (25) is fixedly mounted on the rear side wall outside the main box (1), the output shaft of the driving motor (25) passes through the rear side wall of the main box (1) and is fixedly connected to the first pulley (27), the housing of the horizontal telescopic member (26) is fixedly mounted on the side wall of the main box (1), a second locker (28) is fixedly mounted on the horizontal telescopic member (26), the horizontal telescopic member (26) passes through the side wall of the main box (1), and is hinged with a rubber roller (29) at one end close to the microporous shell (13), the rubber roller (29) contacts the lower side of the microporous shell (13), and the lower part of the rubber roller (29) is immersed in the circulating liquid receiving mechanism (8), and a sliding groove is provided on the main box (1), and the sliding groove is slidably connected to the rubber roller One end of the (29) shaft, the other end of the rubber roller (29) shaft extending into the main box (1) is fixedly installed with a second pulley (30), the first pulley (27) and the second pulley (30) are connected by a synchronous belt (31) to realize transmission, a group of slide grooves (32) are opened on the side wall of the main box (1), the shafts of the second pulley (30) correspond to the slide grooves (32) one by one, a transition wheel (33) is provided on the synchronous belt (31), the bracket of the transition wheel (33) is fixedly installed on the inner wall of the main box (1), a tensioning wheel (34) is provided between the transition wheel (33) and the second pulley (30), the frame of the tensioning wheel (34) is fixedly installed on the inner wall of the main box (1), a spring is provided in the frame of the tensioning wheel (34), and the tensioning wheel (34) adjusts the tension of its own spring by the tension of the synchronous belt (31).

4. A back coating liquid coating machine according to claim 1, characterized in that: The circulating liquid receiving mechanism (8) includes a liquid receiving tray (35), a liquid inlet (36) is provided at one end of the lower surface of the liquid receiving tray (35), the liquid inlet (36) is connected to one end of a liquid inlet pipe (37), the other end of the liquid inlet pipe (37) is fixedly connected to a water inlet (39) of a circulating liquid water tank (38), a water outlet (40) of the circulating liquid water tank (38) is connected to one end of a return pipe (41), the other end of the return pipe (41) is fixedly connected to a liquid outlet (42) at the other end of the liquid receiving tray (35), a circulating pump (43) is installed between the water outlet (40) and the return pipe (41), the circulating pump (43) regulates the flow rate of the infiltration liquid flowing into the liquid receiving tray (35), and the lower part of the microporous shell (13) and the lower part of the rubber roller (29) are immersed in the liquid receiving tray (35).

5. The back coating liquid coating machine according to claim 3, characterized in that: A plurality of No. 2 pressure sensors (44) are fixedly installed at the contact position between the rubber roller (29) and the microporous shell (13) for monitoring the pressure between the rubber roller (29) and the microporous shell (13). The plurality of No. 2 pressure sensors (44) are wirelessly connected to the No. 2 locker (28).

6. The back coating liquid coating machine according to claim 1, characterized in that: The microporous shell (13) is a stainless steel tube with polished inner and outer surfaces. A plurality of microtubes (45) are provided on the microporous shell (13). The plurality of microtubes (45) are evenly distributed around the circumference with the microporous shell (13) as the center. Arc spherical grooves (46) are provided at the outer ends of the microtubes (45).

7. The back coating liquid coating machine according to claim 1, characterized in that: The feed pipe (6) is provided with a liquid supply valve (47), and the liquid supply valve (47) regulates the flow rate of the impregnation liquid flowing into the quantitative feeding coating roller (7).

8. The back coating process coating machine according to claim 1, characterized in that: The ceramic-rubber composite sealing ring (17) comprises two tooth-shaped ceramics (48), with an elastic rubber (49) disposed between the two tooth-shaped ceramics (48). The elastic rubber (49) provides a supporting force by deformation, thereby ensuring that the two tooth-shaped ceramics can closely fit the microporous shell (13) and the feed cavity (9).

9. A back coating liquid coating machine and a method for preparing a special film using the same according to any one of claims 2 to 8, characterized in that: Step 1: Clean the liquid storage tank (5), the liquid receiving tray (35) and the connecting pipelines to ensure that there are no residual impurities; Check whether the microtubes (45) on the surface of the microporous shell (13) are unobstructed and free of blockage or damage; calibrate the parallelism of the rubber roller (29), the positive pressure roller (22), the feed pressure roller (21) and the discharge pressure roller (23) to ensure that the roller surface spacing error is ≤0.1mm; prepare the impregnation liquid: according to the characteristics of the special membrane material, prepare the impregnation liquid and inject it into the liquid storage tank (5); at the same time, add solvent to the circulating liquid tank (38) for system preheating and circulation; Step 2: manually open the liquid supply valve (47), and the infiltration liquid in the liquid storage tank (5) fills the liquid supply pump motor (11) through the pipeline, and then open the circulation pump (43), and the low-concentration or concentration-standard infiltration liquid in the circulating liquid tank (38) fills the liquid receiving tray (35), and realizes liquid circulation through the liquid inlet (36) and the liquid outlet (42) of the liquid receiving tray (35); slowly start the liquid supply pump motor (11), let the infiltration liquid fill the screw (12) and discharge the air inside the quantitative feeding coating roller (7); Step 3: Turn on the driving motor (25) at the same time to drive the rotation of the No. 1 pulley (27), the No. 2 pulley (30) and the rubber roller (29), and operate the horizontal telescopic member (26) to move the rubber roller shaft in the sliding groove to contact the microporous shell (13), and at the same time, the No. 2 pressure sensor (44) detects the pressure value between the auxiliary roller and the microporous shell (13), and the pressure value is set to 0.1-0.3 MPa. When the pressure value reaches the preset value, the No. 2 locker (28) locks the auxiliary roller. During this process, the infiltration liquid is continuously transported to the microtube (45) through the through hole (10), and the infiltration liquid forms countless droplets above the microtube (45) to form an infiltration area; Step 4: Finally, the pressure roller motor (18) is controlled to drive and adjust the three elevators (19), and the height of the feed pressure roller (21), the positive pressure roller (22) and the discharge pressure roller (23) is adjusted so that the materials pass through at the same time. Then, the pressure roller motor (18) and the elevator (19) corresponding to the positive pressure roller (22) are started, and the positive pressure roller (22) is brought into contact with the lower microporous shell (13). The pressure value between the positive pressure roller (22) and the microporous shell (13) is detected by the No. 1 pressure sensor (24). The pressure value is set to 0.2-0.5 MPa. When the preset value is reached, the No. 1 locker (20) locks the elevator (19), and then the feed pressure roller (21) and the discharge pressure roller are adjusted by the elevator (19). The height of the roller (23) is such that the feed roller (21) and the discharge roller (23) contact the material and continue to descend. The linear speeds of the feed roller (21), the positive pressure roller (22) and the discharge roller (23) are consistent, and the error is controlled within ±0.5m / min, so that the material and the microporous shell (13) form a wrap angle, and the wrap angle range is 30°-60°. The No. 1 locker (20) locks the feed roller (21) and the discharge roller (23), and finally adjusts the speed of the liquid supply pump motor (11). At this time, the speed of the liquid supply pump motor (11) is set to 100-500r / min, so that it can achieve continuous operation after reaching a back coating amount of 10-100g / m²; Step 5: First, turn off the liquid supply pump motor (11) to stop the liquid supply; after the residual infiltration liquid on the microporous shell (13) is exhausted, stop the driving mechanism of the rubber roller (29) and each pressure roller in turn; finally, turn off the circulation pump (43) and the liquid supply valve (47), flush the liquid storage tank (5), the connecting pipeline and the microporous shell (13) with solvent to remove the residual infiltration liquid; check whether the microtube (45) is blocked, and blow it out with high-pressure air if necessary.

10. The back coating process coating machine and the method for preparing a special film using the same according to claim 9, characterized in that: The deformation rate of the rubber roller (29) is set to 1%-5%, and the liquid flow rate in the liquid receiving tray (35) is 5-10 L / min.

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