CN217257029U - Casting device - Google Patents

Abstract

The utility model discloses a casting device, which comprises a conveying mechanism for conveying a substrate film belt, and is characterized by also comprising an opening container for storing coating liquid and a casting roller; a casting roller rotating relative to the open container, at least part of the roller surface of which is positioned below the liquid level of the coating liquid and on which a base film belt to be coated is wound; the base film strip is wound in from one side of the casting roller and is wound out from the other side of the casting roller. The utility model discloses reduce medium film's defect, improved medium film's coating precision.

Description

Casting device

Technical Field

The utility model relates to a curtain coating shaping field, in particular to curtain coating device.

Background

At present, with the rapid development of 5G and intelligent electronic equipment, the demand of multi-layer ceramic resistors, capacitors (MLV, MLCC) and other electronic elements rises, and the heat of products is high. The surface layer of the electronic element needs to form a film layer composed of ceramic materials and the like. The existing production process of the multi-layer ceramic electronic component forms a thin film layer in a tape casting mode. The conventional ceramic slurry is formed on the surface of a multilayer ceramic resistor or the like mainly by a casting method such as doctor blade coating, extrusion coating, and pull-up coating.

For the blade coating method, the corresponding coating equipment needs to meet higher precision requirements because a relatively stable distance needs to be kept between the blade and the substrate film belt (a primary product of a multi-layer ceramic resistor and the like). In addition, the coating equipment requires the slurry to have higher viscosity and lower fluidity, and the higher viscosity is easy to ensure that bubbles generated in the slurry are not easy to discharge, and the bubbles are not easy to filter before forming, so that a filter element is easy to block, the production difficulty of slurry preparation and tape casting is invisibly improved, and the cast ceramic membrane is difficult to keep in a stable thickness interval.

As for the extrusion discharge coating method, in the method, the coating apparatus is provided with extrusion apparatuses at both sides in the thickness direction of the base film tape, respectively. The coating equipment is also suitable for high-viscosity low-fluidity slurry. This type of slurry is easily set on a pressing device to result in low yield.

For the method of dip coating, it is particularly suitable for the casting coating of low viscosity ceramic slurry. In this method, both sides of the width of the base film tape are clamped on respective lifting devices. In the production process, the lifting equipment lifts and pulls the slurry from the bottom of the distributing trough containing the slurry, and the slurry forms a thin film layer on the base film belt by virtue of the good fluidity of the low-viscosity ceramic slurry. Due to the influence of wall friction and the like, the slurry is insufficiently circulated in the distributing chute, so that the thickness of the membrane strip is uneven. And, during the production process, the surface of the base film belt can generate friction on the sealing strip arranged at the outlet of the distributing trough, which can promote the base film belt to generate scratches and be reflected on the medium film, thereby causing the defects of the medium film to be increased and the precision to be reduced.

Disclosure of Invention

The utility model provides a casting device for forming a thin layer with uniform thickness on the surface of a film belt, which solves the technical problems in the prior art.

The utility model discloses a technical scheme who takes for solving the technical problem that exists among the well-known technique is: a casting device comprises a conveying mechanism for conveying a substrate film belt, an opening container for containing coating liquid and a casting roller; a casting roller rotating relative to the open container, at least part of the roller surface of which is positioned below the liquid level of the coating liquid and on which a base film belt to be coated is wound; the base film strip is wound in from one side of the casting roller and is wound out from the other side of the casting roller.

Further, the angle range of the base film strip with the horizontal direction when it is wound out from one side of the casting roll is 45 ° to 90 °.

Further, a casting roll positioning mechanism for horizontally and/or vertically moving the axis of the rotation shaft of the casting roll is also included.

Furthermore, the casting roller position adjusting mechanism comprises a vertical supporting rod and a transverse telescopic rod, one end of the vertical supporting rod is hinged with a fixed pivot positioned above the opening container, and the other end of the vertical supporting rod is hinged with a rotating shaft of the casting roller; one end of the transverse telescopic rod is hinged with a rotating shaft of the casting roller, and the rotating shaft axis of the casting roller circumferentially moves by taking the fixed fulcrum as a circle center when the transverse telescopic rod stretches out and draws back.

Furthermore, the vertical support rod is telescopic, when the vertical support rod is telescopic, the axis of a rotating shaft of the casting roller radially moves by taking the fixed fulcrum as a circle center, and the telescopic range of the vertical support rod is 40 cm-60 cm.

Furthermore, the device also comprises a first fixed frame, a second fixed frame, a transverse sliding rod and a longitudinal sliding rod; the transverse sliding rod is vertically connected with the longitudinal sliding rod; the first fixing frame comprises an outer frame and a telescopic supporting column positioned in the outer frame; the bottom end of the telescopic support column is fixedly connected with the bottom of the outer frame; the top end of the telescopic support column is fixedly connected with the open container; the upper part of the outer frame is rotationally connected with the casting roller; the lower part of the outer frame is fixedly connected with a horizontal chute; the transverse sliding rod is in sliding fit with the horizontal sliding chute; the second fixing frame is fixed relative to the ground and is provided with a vertical sliding chute; the longitudinal sliding rod is in sliding fit with the vertical sliding groove.

Further, the transport mechanism includes a first guide roller and a second guide roller, the second guide roller being located above the first guide roller and, at the same time, being located directly above the casting roller; the first guide roller is positioned on the upstream side of the base film strip wound into the casting roller, the second guide roller is positioned on the downstream side of the base film strip wound out of the casting roller, and the first guide roller and the second guide roller enable the base film strip to be wound at least by one half of the casting roller in the circumferential direction of the casting roller.

Furthermore, a circulating port through which the coating liquid circularly flows is arranged on the opening container; the circulating ports are distributed on two sides of the axis of the casting roller; a circulating pipeline and a circulating pump are arranged between the opposite circulating ports at the two sides.

Furthermore, grooves A communicated with the circulation port are formed in the side wall of the open container along the axial direction of the casting roller, and the grooves A are distributed on two sides of the open container and are symmetrical relative to the axial line of the casting roller; the bottom of the open container is provided with a liquid inlet, and the bottom of the open container is provided with a groove B communicated with the liquid inlet along the axial direction of the casting roller; the width of the groove openings of the groove A and the groove B is 0.5mm-1.5mm, the cross sections of the bottom of the groove A and the groove B are arc-shaped, and the arc radius is 2.5 mm-5 mm.

Further, the open container is provided with an overflow outlet near the opening edge thereof.

The utility model has the advantages and positive effects be: after storing a conventional volume of the coating liquid in the open container, the casting roller can be completely immersed in the coating liquid in at least one third of the height direction for ensuring a sufficient contact time and distance between the base film strip disposed on the surface of the casting roller and the coating liquid. The defects of the dielectric film are reduced, and the coating precision of the dielectric film is improved.

The telescopic support columns are arranged to generate fixed thrust for maintaining constant friction force between the sealing strip and the base film strip, so that the surface of the base film strip is maintained in a flat state in the moving process, and the coating liquid is prevented from flowing into the surface of one side, away from the container, of the base film strip.

The casting device is also provided with a transverse sliding rod and a longitudinal sliding rod which are mutually vertical, and a horizontal sliding chute and a vertical sliding chute which are correspondingly matched with the transverse sliding rod and the longitudinal sliding rod. When the vertical supporting rod is extended or shortened, the vertical supporting rod drives the longitudinal sliding rod to move downwards or upwards along the vertical sliding groove through the transmission shaft and the first fixing frame. When the transverse telescopic rod is extended or shortened, the transverse telescopic rod drives the first fixing frame to move left or right. Because the horizontal sliding rod and the longitudinal sliding rod are mutually in a vertical relation, and the horizontal sliding groove and the vertical sliding groove are also mutually in a vertical relation, the first fixing frame can be kept in a horizontal state under the restraining action of the horizontal sliding rod, the longitudinal sliding rod and the second fixing frame in the change process of the expansion amount of the horizontal telescopic rod. In the adjusting process of the transverse telescopic rod and the conventional working process of the casting device, the liquid level in the open container can be always maintained in a horizontal state, and the phenomenon that the open container rotates to enable the coating liquid in the open container to shake can be avoided. Because the liquid level of the coating liquid is always in a horizontal state, the coating liquid at the position adjacent to the moving-out position of the substrate film strip cannot shake violently to form coating liquid thin layers with different thicknesses at different surface positions of the substrate film strip.

The coating liquid in the open container is kept at the highest position by the circulating system and flows out from the overflow port, so that the liquid level in the open container is free from the risk of fluctuation due to consumption of the coating liquid, thereby being beneficial to maintaining the fixed coating time of the substrate film strip.

The side walls of the opposite sides of the open container are provided with circulation ports, and the circulation pumps are communicated with the circulation ports on the different side walls to circularly flow, so that the generation of precipitates is effectively avoided. Ensuring that the coating liquid adjacent to the substrate film strip has better flow speed.

Drawings

FIG. 1 is a schematic view of a casting apparatus according to the present invention.

Fig. 2 is a schematic view of the relative position of the casting roll and the open container in fig. 1.

Fig. 3 is a schematic view of the structure of an open container.

In the figure: 1. a second guide roller; 2. a vertical support bar; 3. a base film tape; 4. a first guide roller; 5. a transverse telescopic rod; 6. a third guide roller; 7. a tension roller; 8. a transverse sliding bar; 9. a longitudinal slide bar; 10. a vertical chute; 11. a second fixing frame; 12. a circulation line; 13. a circulation pump; 14. a liquid adding pump; 15. a liquid feeding pipeline; 16. a horizontal chute; 17. a telescopic support column; 18. an outer frame; 19. an open container; 20. a casting roll; 21. a coating liquid storage barrel; 22. an overflow outlet; 23. a circulation port; 24. a liquid inlet; 25. coating liquid; 26. a sealing strip. H. The height of the vertical support bar.

Detailed Description

For further understanding of the contents, features and effects of the present invention, the following embodiments will be described in detail in conjunction with the accompanying drawings:

referring to fig. 1 to 3, a casting apparatus includes a conveying mechanism for conveying a base film belt 3, and further includes an open container 19 for containing a coating liquid 25 and a casting roller 20; a casting roller 20 rotating relative to the open container 19 with at least a part of the roller surface below the liquid level of the coating liquid 25, on which the base film tape 3 to be coated is wound; the base film tape 3 is wound in from one side of the casting roller 20 and is wound out from the other side of the casting roller 20. After storing a conventional volume of the coating liquid in the open container, the casting roller may be capable of being completely immersed in the coating liquid in at least one third of its height direction for ensuring sufficient contact time and distance between the base film strip disposed on the surface of the casting roller and the coating liquid.

Preferably, the angle range from the horizontal direction when the base film tape 3 is wound out from the casting roll 20 side may be 45 ° to 90 °. The coating liquid 25 is applied to the left side surface of the base film tape 3 when the base film tape 3 is wound out from the side of the casting roller 20 in fig. 1. The base film strip 3 is clamped at 45-90 degrees with the horizontal line on the right side.

Preferably, a casting roll 20 positioning mechanism for moving the axis of the rotation shaft of the casting roll 20 horizontally and/or vertically may be further included.

Preferably, the casting roll 20 positioning mechanism can comprise a vertical supporting rod 2 and a transverse telescopic rod 5, one end of the vertical supporting rod 2 is hinged with a fixed pivot positioned above the opening container 19, and the other end is hinged with a rotating shaft of the casting roll 20; one end of the transverse telescopic rod 5 is hinged with the rotating shaft of the casting roller 20, and the rotating shaft axis of the casting roller 20 circumferentially moves by taking a fixed fulcrum as a circle center when the transverse telescopic rod stretches.

Preferably, the vertical support rod 2 is telescopic, the height H of the vertical support rod is adjustable, the axis of the rotating shaft of the casting roller 20 radially moves by taking the fixed fulcrum as a circle center when the vertical support rod is telescopic, and the telescopic range of the vertical support rod 2 can be 40 cm-60 cm.

Preferably, the device also comprises a first fixed frame, a second fixed frame 11, a transverse sliding rod 8 and a longitudinal sliding rod 9; the transverse sliding rod 8 is vertically connected with the longitudinal sliding rod 9; the first mount may include an outer frame 18 and telescoping support posts 17 located within the outer frame 18; the bottom end of the telescopic supporting column 17 is fixedly connected with the bottom of the outer frame 18; the top end of the telescopic supporting column 17 is fixedly connected with the open container 19; the upper part of the outer frame 18 is rotatably connected to the casting roll 20; the lower part of the outer frame 18 is fixedly connected with a horizontal chute 16; the transverse sliding rod 8 can be in sliding fit with the horizontal sliding chute 16; the second fixed frame 11 is fixed relative to the ground and can be provided with a vertical sliding chute 10; the longitudinal slide 9 is slidably engaged with the vertical slide groove 10. One end of the transverse telescopic rod 5 is hinged with the rotating shaft of the casting roller 20, and the other end of the transverse telescopic rod 5 is hinged with the middle part of the second fixing frame 11. The first fixing frame can be provided with a bearing seat for installing the rotating shaft of the casting roller 20; the first mount may be suspended by a vertical support bar 2.

The conveying mechanism can comprise a driving roller, a guide roller, a tension roller 7, a driven roller and the like; the rotating shafts of the driving roller, the guide roller, the tension roller 7 and the driven roller can be fixedly arranged on the equipment. Preferably, the transport mechanism may include a first guide roller 4 and a second guide roller 1, and the second guide roller 1 may be located above the first guide roller 4 and, at the same time, may be located directly above the casting roller 20; the first guide roller 4 may be located on an upstream side of the winding of the base film strip 3 into the casting roller 20, the second guide roller 1 may be located on a downstream side of the winding of the base film strip 3 out of the casting roller 20, and the first guide roller 4 and the second guide roller 1 may cause the base film strip 3 to wind at least half of the casting roller 20 in a circumferential direction of the casting roller 20.

Preferably, the open container 19 may be provided with a circulation port 23 through which the coating liquid 25 circularly flows; the circulation ports 23 may be distributed on both sides of the axis of the casting roll 20; a circulation pipeline 12 and a circulation pump 13 can be arranged between the circulation ports 23 which are opposite to each other on the two sides.

Preferably, grooves A communicated with the circulating port 23 can be formed on the side wall of the open container 19 along the axial direction of the casting roll 20, and the grooves A can be distributed on two sides of the open container 19 and are symmetrical relative to the axial line of the casting roll 20; the bottom of the open container 19 can be provided with a liquid inlet 24, and the bottom of the open container 19 can be provided with a groove B communicated with the liquid inlet 24 along the axial direction of the casting roller 20; the width of the groove openings of the groove A and the groove B can be 0.5mm-1.5mm, the cross sections of the bottoms of the groove A and the groove B can be arc-shaped, and the arc radius can be 2.5 mm-5 mm.

Preferably, the open container 19 may be open near its open edge with an overflow outlet 22.

The telescopic structures of the vertical support rod 2, the transverse telescopic rod 5 and the telescopic support column 17 can adopt a pneumatic telescopic rod, a hydraulic telescopic rod and an electric telescopic rod in the prior art.

The working principle of the present invention is further explained by a preferred embodiment of the present invention as follows:

what has been described herein is merely a preferred embodiment in accordance with the present invention, and those skilled in the art will appreciate that other ways of implementing the present invention on the basis of the preferred embodiment will also fall within the scope of the present invention. In the following detailed description, directional terms, such as "upper", "lower", "inner", "outer", "longitudinal", "lateral", and the like, are used with reference to the orientation depicted in the accompanying drawings. Components of embodiments of the present invention can be positioned in a number of different orientations, and the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 shows an overall structure of a casting apparatus of the present invention. As shown in FIG. 1, the casting apparatus is composed of an open container 19, a casting roller 20, a conveying mechanism, a positioning mechanism of the casting roller 20, a coating liquid reservoir 21 connected to the open container 19 through a liquid supply line 15, and the like.

Referring to fig. 2 and 3, a schematic cross-sectional view and a perspective view of the open container 19 are shown, respectively. The open container 19, i.e., a distribution chute, for storing the coating liquid 25 has an opening at its upper end. According to one embodiment of fig. 1-3, the open container 19 is generally semi-cylindrical in shape. The open container 19 is provided with end caps at both axial ends. The upper surface of the end cap has a circular arc configuration adapted to the outer profile shape of the casting roll 20, and is formed with a groove or projection or the like adapted to fit the weather strip 26.

Instead of a semi-cylindrical shape as shown in fig. 1-3, the open container 19 may have other shapes, for example two thirds, three quarters etc. of a circular shape in cross-section. In addition, the cross-section of the open vessel 19 may also be formed in other arcuate configurations.

Referring to fig. 1 and 2, a casting roll 20 is rotatably fixed to a drive shaft thereof and is disposed at an opening of an opening container 19. The rotational sealing between the casting roll 20 and the open container 19 is achieved by the above-mentioned sealing tape 26. After storing the coating liquid 25 of a regular capacity in the open container 19, the casting roller 20 can be completely immersed in the coating liquid 25 in at least one third of the height direction for securing a sufficient contact time and distance between the base film band 3 disposed on the surface of the casting roller 20 and the coating liquid 25.

Preferably, in the mounted state, the axis of the casting roll 20 and the axis of the semicylindrical casting roll 20 are located in a vertical plane. Referring to fig. 2, 3, the left and right sides of the portion of the casting roller 20 immersed in the coating liquid 25 are equally spaced from the inner wall surface of the open vessel 19 at the corresponding positions. The casting roll 20 will be in an environment of the coating liquid 25 in a good flow state due to the distance from the wall surface of the open container 19, which will be advantageous for uniformly bonding the coating liquid 25 to each position of the base film tape 3 wound around the casting roll 20.

In order to ensure a good flow velocity of the coating liquid 25 adjacent to the base film strip 3, the spacing between the casting roll 20 (or the base film strip 3 on the casting roll 20) and the inner wall surface of the open container 19 is preferably any distance in the range of 50 to 150mm, for example, 60mm, 80mm, 120mm, or the like.

Alternatively, the diameter of the casting roller 20 is approximately one-half, one-third, etc. of the inner diameter of the open container 19.

In the embodiment of fig. 1, the movement of the base film tape 3 is realized by a conveying mechanism. The conveying mechanism includes a plurality of guide rollers including a driving roller, a first guide roller 4, a second guide roller 1, a third guide roller 6, a tension roller 7, and the like, which are located at positions upstream and downstream of the casting roller 20, respectively, in the moving direction of the base film belt 3, and a driving mechanism that drives the driving roller. The drive mechanism may be a conventional motor or may consist of a motor and optionally a conveyor belt, toothed rollers, etc. The first guide roller 4, the second guide roller 1, the third guide roller 6, the tension roller 7 and the like are arranged in such a way that the driving mechanism can be arranged on only a part of the guide rollers, and in this case, the guide rollers without the driving mechanism are used as driven devices for guiding.

Referring to fig. 1, in a preferred embodiment, on the conveyance path of the base film tape 3, the conveyance mechanism includes a first guide roller 4 at a position upstream of the casting roller 20, and a second guide roller 1 at a position downstream of the casting roller 20. The first guide roller 4, the casting roller 20, and the second guide roller 1 are arranged in this order along the conveyance path of the base film tape 3. The first guide roller 4 and the second guide roller 1 are configured such that the base film band 3 wraps around the casting roller 20 by at least half in the circumferential direction of the casting roller 20. For example, referring to fig. 1, the first guide roller 4, the second guide roller 1 may be arranged such that their guide surfaces for guiding the base film tape 3 are located radially inside the casting roller 20, as viewed in the axial direction of the casting roller 20.

Preferably, the second guide roller 1 is arranged above the first guide roller 4, and more preferably, the first guide roller 4, the second guide roller 1 are arranged directly above the casting roller 20. After the base film web 3 is guided by the second guide roll, the base film web 3 is moved substantially horizontally to a further downstream position for the next processing step.

According to the present invention, the speed of the substrate film tape 3 when passing through the coating liquid 25 is not higher than 2m/min, for example, 1.8m/min, 1.5m/min, or the like, by appropriately adjusting the conveying mechanism.

In order to adjust the coating effect of the base film band 3, the casting roller 20 (rotational axis of the casting roller 20) may be adjusted in position by the casting roller 20 positioning mechanism. The casting roll 20 positioning mechanism comprises at least two transverse telescopic rods 5 hinged with the transmission shaft of the casting roll 20. The transverse telescopic rods 5 can be arranged at different axial positions of the drive shaft, preferably the transverse telescopic rods 5 are arranged at both axial ends of the drive shaft. The transverse telescopic rod 5 may be fixed with one end hinged to the rotation shaft of the casting roll 20 by a conventional bearing fit.

In the embodiment of fig. 1, a vertically arranged vertical support bar 2 and a horizontally arranged transverse telescopic bar 5. The vertical support rod 2 is a telescopic rod; the top end of the vertical support bar 2 of fig. 1 is set flush with the second guide roller 1. Different positions of the casting roller 20 in the vertical direction and the horizontal direction can be adjusted by adjusting different telescopic lengths of the vertical supporting rod 2 and the transverse telescopic rod 5, and then the conveying angle and the conveying distance of the base film strip 3 after being moved out of the casting roller 20 are adjusted. It can be understood that the arrangement mode of the transverse telescopic rod 5 can be also adjusted adaptively on the basis of meeting the requirement of adjusting the position of the casting roller 20.

Since the base film tape 3 is just removed from the casting roll 20, the coating liquid 25 on the base film tape 3 is not completely solidified. Under the action of gravity, the coating liquid 25 will uniformly flow down along the surface of the base film strip 3, thereby forming a smooth and relatively uniform thin layer of the coating liquid 25 on the base film strip 3.

According to the viscosity of the coating liquid 25, the thickness of a thin layer of the coating liquid 25 to be formed on the base film strip 3 and the like, the transverse telescopic rod 5 is positioned to enable the base film strip 3 to be moved out of the casting roller 20, wherein the included angle between the moving-out direction and the horizontal direction ranges from 45 degrees to 90 degrees, and the transverse telescopic rod 5 is positioned to enable the vertical moving distance H after the base film strip 3 is moved out of the casting roller 20 to range from 40cm to 60cm, namely the distance H of the base film strip 3 between the casting roller 20 and the second guide roller 1 is 40cm to 60 cm. For example, in one embodiment, the angle θ between the moving-out direction of the base film strip 3 and the horizontal direction is 60 °, and the vertical moving distance after the base film strip 3 is moved out from the casting roll 20 is 48 cm. In another embodiment, the angle between the moving-out direction of the base film strip 3 and the horizontal direction is 72 °, and the vertical moving distance after the base film strip 3 is moved out from the casting roll 20 is 45 cm.

The above-described moving distance and moving direction of the base film tape 3 downstream of the casting roller 20 are particularly suitable for a scene of applying a coating liquid 25 such as a ceramic slurry of low viscosity. In particular, the coating liquid 25 is preferably a water-based ceramic slurry that is environmentally friendly and low in cost.

The casting apparatus includes a telescopic support column 17 for supporting the open container 19, the telescopic support column 17 being configured to be capable of adjusting a vertical position of the open container 19 so as to closely abut the bead 26 on the open container 19 against an outer surface of the casting roll 20. More specifically, the seal bars 26 are attached to the base film tape 3 at both ends in the axial direction of the casting roller 20, thereby preventing the base film tape 3 from being attached to the surface of the casting roller 20 without contacting the coating liquid 25.

The lower end of the telescopic supporting column 17 may be directly fixed to a support frame provided on the ground, a wall surface, or other fixed objects, and more preferably, the telescopic supporting column 17 is supported by a first fixing frame described below.

Referring to fig. 1, a first frame-type mount is assembled from any of a plurality of vertical and lateral support bars and/or support plates rotatably mounted to the drive shaft of the casting roll 20 by bearing assemblies. One end of the telescopic support column 17 may be fixed to the bottom of the first fixing frame as shown in fig. 1, and the other end abuts on the open container 19 to push the open container 19 toward the casting roll 20. Further, on the premise that the purpose of pushing the open vessel 19 toward the casting roller 20 portion is achieved, part or all of the one ends of the telescopic support columns 17 may be further fixed to the side portion (not shown) of the first fixing frame, which may be arranged as necessary.

According to the above supporting manner that the first fixing frame is suspended and fixed on the transmission shaft, the first fixing frame can move synchronously with the casting roll 20 without being driven by other driving mechanisms under the condition that the extension amount of the transverse telescopic rod 5 is randomly adjusted in the up-down direction and the left-right direction. The telescopic support column 17 fixed to the first holder is also moved synchronously with it, so that the open vessel 19 is pressed against the casting roll 20 at any time.

According to some embodiments of the present invention, the telescopic support column 17 may be provided with a fixed thrust for maintaining a constant frictional force of the sealing strip 26 and the base film tape 3, so that the surface of the base film tape 3 maintains a flat state in the process of movement, and the coating liquid 25 is prevented from flowing into one side surface of the base film tape 3 deviating from the container. Specifically, the coating liquid 25 in the open container 19 is held at the highest position by the charging pump 14 and flows out from the overflow port 22 (described later), so that there is no risk of the liquid level in the open container 19 fluctuating due to consumption of the coating liquid 25, thereby facilitating maintenance of a fixed coating time of the base film tape 3. In the case where the liquid level of the open container 19 does not change, the total weight of the open container 19 containing the coating liquid 25 does not change, and the telescopic support columns 17 provided with a fixed thrust force can therefore ensure that the frictional force between the seal bar 26 and the base film tape 3 is maintained in a stable state.

Further referring to fig. 1, the casting apparatus further includes a second holder 11 located at a side of the first holder. The first fixed frame is provided with a horizontal chute 16 extending horizontally. The second holder 11 has a vertical sliding groove 10 extending vertically.

The casting device is further provided with a fixing bar in a T-shaped configuration, specifically, the fixing bar is composed of a transverse slide bar 8 and a longitudinal slide bar 9 which are perpendicular to each other. Wherein the transverse slide 8 is slidably fixed to the horizontal runner 16 and the longitudinal slide 9 is movably fixed to the vertical runner 10. In some embodiments, one or both of the horizontal sliding groove 16 and the horizontal sliding rod 8 are provided with rolling rollers, and the horizontal sliding groove 16 and the horizontal sliding rod 8 are tightly attached in the vertical direction through the rolling rollers. In other embodiments, balls are fixed on the surfaces facing each other on one or both of the horizontal sliding groove 16 and the lateral sliding bar 8. Similar to the fit relationship between the horizontal runner 16 and the transverse slide 8, the vertical runner 10 and the longitudinal slide 9 may also be slidably fitted by the above-described form.

Referring to the direction of fig. 1, when the vertical support rod 2 extends or shortens, the vertical support rod 2 drives the longitudinal slide rod 9 of the fixed rod to move down or up along the vertical sliding groove 10 through the transmission shaft and the first fixed frame. When the transverse telescopic rod 5 extends or shortens, the transverse telescopic rod 5 drives the first fixing frame to move left or right. Because the transverse slide bar 8 and the longitudinal slide bar 9 of the fixing bar are in a vertical relationship with each other, and the horizontal sliding groove 16 and the vertical sliding groove 10 are also in a vertical relationship with each other, the first fixing frame can be kept in a horizontal state under the restraining action of the fixing bar and the second fixing frame 11 in the process of changing the expansion and contraction amount of the transverse telescopic bar 5. The liquid level in the open container 19 can thus be maintained in a horizontal state at all times during the adjustment process of the lateral expansion link 5 and the normal operation of the casting device, which can avoid the occurrence of a rotation of the open container 19 and a shaking of the coating liquid 25 in the open container 19. It can be understood that since the liquid level of coating liquid 25 is always in a horizontal state, coating liquid 25 at a position adjacent to the position where base film strip 3 is moved out does not shake so sharply that a thin layer of coating liquid 25 with different thicknesses is formed at different surface positions of base film strip 3.

Above the casting roll 20 may be disposed a cold light source for a worker to observe in real time the forming process of the coating liquid 25 on the surface of the base film band 3. The cold light source may be disposed at a position flush with or above the second guide roller 1.

The present invention also provides a structure and a method for ensuring that the concentration of the coating liquid 25 in each place in the open container 19 is kept uniform. In particular, referring to fig. 1-3, the open vessel 19 comprises a liquid inlet 24 at the bottom and circulation ports 23 on different side walls. The open vessel 19 includes a circulation port 23 and a circulation pump 13, wherein the circulation port 23 is formed on the side wall on the opposite side of the open vessel 19, and the circulation pump 13 communicates with the circulation port 23 on the different side wall. After the circulating pump 13 is started, the coating liquid 25 in the open container 19 circularly flows in the open container 19 under the driving action of the circulating pump 13, and the generation of precipitation is effectively avoided.

The circulation ports 23 on opposite sides may be provided at the same height position of the open vessel 19. Further, the circulation port 23 may be provided at an intermediate position of the open container 19 in the vertical direction. The circulation port 23 is oriented toward the central axial position of the open vessel 19. This form of liquid inlet 24 and circulation port 23 etc. will facilitate the circulation of the coating liquid 25 in the open container 19 at a relatively uniform flow rate.

The circulation port 23 and the liquid inlet 24 are set to be narrow slits having a width in the range of 0.5mm to 1.5 mm. In one embodiment, the wall of the open container 19 has a tubular cavity formed therein extending along its length. The tubular cavity is provided with the above-mentioned elongated slit. Optionally, the inner diameter of the tubular cavity is set in the range of 5mm-10 mm.

In the embodiment of fig. 1-3, the circulation openings 23 are provided in only two, in some not shown embodiments the circulation openings 23 may also be provided in a larger number, and the circulation openings 23 are preferably provided in pairs on opposite sides of the open container 19.

The circulation pump 13 for causing the coating liquid 25 to flow is preferably a peristaltic pump. In addition to the peristaltic pump being provided in the circulation line 12 connecting the respective circulation ports 23, as shown in fig. 1, the charge pump 14 may be provided in the charge line 15 connecting the coating liquid reservoir 21 and the open container 19, and the charge pump 14 may be a peristaltic pump. In the working process, the peristaltic pump is not in direct contact with the slurry, the coating liquid 25 does not have the risk of leakage, and the pump body is not in direct contact with the coating liquid 25, so that the conditions that the coating liquid 25 is polluted and the slurry corrodes the pump body can be avoided.

With continued reference to fig. 1 and 3, in a preferred embodiment, the open container 19 includes an overflow outlet 22 adjacent the edge of the opening. The overflow port 22 is connected with the coating liquid storage barrel 21 through the liquid feeding pipeline 15. The overflow outlet 22 may alternatively be located at any distance within 5-20cm from the edge of the opening.

The above-mentioned embodiments are only used for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, the scope of the present invention should not be limited by the present embodiments, that is, all the equivalent changes or modifications made by the spirit of the present invention should still fall within the scope of the present invention.

Claims (10)

1. A casting device comprises a conveying mechanism for conveying a substrate film belt, and is characterized by further comprising an opening container for containing coating liquid and a casting roller; a casting roller rotating relative to the open container, at least part of the roller surface of which is positioned below the liquid level of the coating liquid and on which a base film belt to be coated is wound; the base film strip is wound in from one side of the casting roller and is wound out from the other side of the casting roller.

2. Casting apparatus according to claim 1, wherein an angle with a horizontal direction when the base film tape is wound out from the casting roll side is in a range of 45 ° to 90 °.

3. The casting apparatus according to claim 1, further comprising a casting roll positioning mechanism which moves a rotation shaft axis of the casting roll horizontally and/or vertically.

4. Casting apparatus as in claim 3, wherein the casting roll positioning mechanism comprises a vertical support rod and a transverse telescopic rod, one end of the vertical support rod being hinged to a fixed fulcrum above the open vessel and the other end being hinged to a rotating shaft of the casting roll; one end of the transverse telescopic rod is hinged with a rotating shaft of the casting roller, and the rotating shaft axis of the casting roller circumferentially moves by taking the fixed fulcrum as a circle center when the transverse telescopic rod stretches.

5. Casting apparatus as defined in claim 4, wherein the vertical support rod is telescopic, and when it is telescopic, the axis of the rotation shaft of the casting roll is radially moved around the fixed fulcrum, and the telescopic range of the vertical support rod is 40cm to 60 cm.

6. The casting apparatus of claim 4, further comprising a first mount, a second mount, a transverse slide, and a longitudinal slide; the transverse sliding rod is vertically connected with the longitudinal sliding rod; the first fixing frame comprises an outer frame and a telescopic supporting column positioned in the outer frame; the bottom end of the telescopic support column is fixedly connected with the bottom of the outer frame; the top end of the telescopic support column is fixedly connected with the open container; the upper part of the outer frame is rotationally connected with the casting roller; the lower part of the outer frame is fixedly connected with a horizontal chute; the transverse sliding rod is in sliding fit with the horizontal sliding chute; the second fixed frame is fixed relative to the ground and is provided with a vertical chute; the longitudinal sliding rod is in sliding fit with the vertical sliding groove.

7. Casting apparatus according to claim 1, wherein the transport mechanism includes a first guide roller and a second guide roller, the second guide roller being located above the first guide roller and simultaneously directly above the casting roller; the first guide roller is positioned on the upstream side of the base film strip wound into the casting roller, the second guide roller is positioned on the downstream side of the base film strip wound out of the casting roller, and the first guide roller and the second guide roller enable the base film strip to be wound at least by one half of the casting roller in the circumferential direction of the casting roller.

8. A casting apparatus according to claim 1, wherein the open container is provided with a circulation port through which the coating liquid circulates; the circulating ports are distributed on two sides of the axis of the casting roller; a circulating pipeline and a circulating pump are arranged between the opposite circulating ports on the two sides.

9. Casting apparatus according to claim 8, wherein a groove a communicating with the circulation port is formed on a side wall of the open container in an axial direction of the casting roll, the groove a being distributed on both sides of the open container and being symmetrical with respect to an axial line of the casting roll; a feed inlet is formed in the bottom of the open container, and a groove B communicated with the feed inlet is formed in the bottom of the open container along the axial direction of the casting roller; the width of the groove openings of the groove A and the groove B is 0.5mm-1.5mm, the cross sections of the bottom of the groove A and the groove B are arc-shaped, and the arc radius is 2.5 mm-5 mm.

10. Casting apparatus according to claim 1, wherein the open container is open with an overflow outlet near its open edge.

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