CN212498594U - Casting device - Google Patents
Casting device Download PDFInfo
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- CN212498594U CN212498594U CN201922483956.2U CN201922483956U CN212498594U CN 212498594 U CN212498594 U CN 212498594U CN 201922483956 U CN201922483956 U CN 201922483956U CN 212498594 U CN212498594 U CN 212498594U
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Abstract
The utility model discloses a curtain coating device, include: a movable carrier which can continuously move along a preset moving direction; the extruding device is used for extruding the melt onto the moving carrier to form a sheet-shaped melt, is positioned above the moving carrier and is provided with a discharge port which faces the moving carrier and is used for discharging; a gap is formed between the discharge port and the movable carrier, and a flow channel is formed between the melt and the discharge port and the movable carrier; a negative pressure chamber formed between the moving carrier and the extrusion device for sucking air of an upstream area of the flow passage in the preset moving direction from the gap to make the upstream area form a negative pressure; the negative pressure cavity is provided with a negative pressure port communicated to the negative pressure generating device, and an included angle between the axial direction of the negative pressure port and the discharging direction of the discharging port is within +/-15 degrees. The device can avoid the direct suction of the negative pressure port to the upstream area, thereby avoiding the shaking of the flaky melt and further improving the film forming quality of the flaky melt.
Description
Technical Field
The application relates to curtain coating film processingequipment field, concretely relates to curtain coating device.
Background
In the field of lithium battery diaphragm processing, most casting devices adopt a negative pressure air cavity device to improve the film forming quality of the diaphragm. The working principle of the negative pressure air cavity device is as follows: the air in the die head attaching area is extracted through the exhaust fan to form a micro negative pressure area, the melt in the molten state forms a flaky melt under the action of the die head, and the flaky melt is uniformly and closely attached to a cooling roller under the suction of negative pressure when passing through the micro negative pressure area and is finally cooled to form a plastic diaphragm with uniform thickness and ideal physical and chemical properties.
However, in practical application, the film with different thicknesses needs to be produced, when the requirement for the production thickness is thicker, equipment is required to use larger negative pressure to obtain a better attaching effect, but when stronger negative pressure is used, the negative pressure is unstable to cause the shaking of the film to form waves, so that the product quality is seriously influenced.
Meanwhile, according to different production requirements, die heads with different shapes are required to be used. Compared with a single-layer die head, the longest-used three-layer co-extrusion die head has a larger body, and a negative pressure cavity formed by installing a negative pressure air cavity is smaller. In addition, because of the volume requirement of the three-layer die head, the angle between the die body of the negative pressure air cavity arranged below and behind the die head and the horizontal plane is smaller, and after the original negative pressure air cavity is arranged, when the negative pressure rises to a certain degree, the situation that the film shakes to form waves due to unstable negative pressure can be met, so that the performance of the equipment is seriously influenced.
Therefore, the prior art design technology often encounters a contradiction in use, namely, a larger negative pressure is required to achieve better product quality, and the phenomenon that the negative pressure unstable film shakes after the negative pressure reaches a certain larger negative pressure value (the optimal larger negative pressure strength is not achieved yet) is started to occur.
SUMMERY OF THE UTILITY MODEL
The present application aims to provide a casting apparatus to improve film formation quality.
The application provides a casting apparatus, including:
a movable carrier which can continuously move along a preset moving direction;
the extruding device is used for extruding the melt onto the moving carrier to form a sheet-shaped melt, is positioned above the moving carrier and is provided with a discharge port which faces the moving carrier and is used for discharging; a gap is formed between the discharge port and the movable carrier, and a flow channel is formed between the melt and the discharge port and the movable carrier;
a negative pressure chamber formed between the moving carrier and the extrusion device for sucking air of an upstream area of the flow passage in the preset moving direction from the gap to make the upstream area form a negative pressure; the negative pressure cavity is provided with a negative pressure port communicated to the negative pressure generating device, and an included angle between the axial direction of the negative pressure port and the discharging direction of the discharging port is within +/-15 degrees.
Further, the casting apparatus, wherein, further comprising: and the buffer cavity is communicated between the negative pressure cavity and the negative pressure generating device and is used for buffering negative pressure intensity fluctuation in the negative pressure cavity.
Further, the casting device, wherein, the negative pressure chamber includes the cover body, the cover body sets up between removal carrier and the extrusion device to enclose with extrusion device and removal carrier and synthesize the negative pressure chamber, the negative pressure mouth is seted up on the cover body.
Further, the casting device is characterized in that a negative pressure pipe is connected to the negative pressure port, one end of the negative pressure pipe is connected with the negative pressure port, and the other end of the negative pressure pipe is connected with the buffer cavity; the axial direction of the negative pressure pipe is coincided with the axial direction of the negative pressure port.
Further, the casting device is provided with a plurality of negative pressure ports, and each negative pressure port is connected with the negative pressure pipe; the casting apparatus further includes: and one end of the connecting pipe is connected with the other end of the negative pressure pipe, and the other end of the connecting pipe is connected with the buffer cavity.
Further, the casting device, wherein the connection pipe is a high temperature resistant flexible connection pipe.
Further, the casting apparatus, wherein the casing includes: the connecting plate comprises a first side plate, a second side plate, a connecting plate and two end plates; the first side plate is connected to the extrusion device, one end of the second side plate is in contact with the movable carrier, the connecting plate is connected between the first side plate and the second side plate, the two end plates are respectively positioned at two ends of the first side plate and the second side plate, and the negative pressure port is formed in the connecting plate; the first side plate, the second side plate, the connecting plate, the two end plates, the extruding device and the movable carrier are enclosed to form the negative pressure cavity.
Further, the casting device, wherein the movable carrier includes a carrying roller, the carrying roller can rotate continuously around its own axis along a preset rotation direction, and the preset movement direction is the preset rotation direction.
Further, the casting apparatus, wherein the carrier roller is a cooling roller.
Further, the casting device, wherein the discharge port is a slit-type discharge port.
The utility model has the advantages that:
the application provides a casting device, including: a movable carrier which can continuously move along a preset moving direction; the extruding device is used for extruding the melt onto the moving carrier to form a sheet-shaped melt, is positioned above the moving carrier and is provided with a discharge port which faces the moving carrier and is used for discharging; a gap is formed between the discharge port and the movable carrier, and a flow channel is formed between the melt and the discharge port and the movable carrier; a negative pressure chamber formed between the moving carrier and the extrusion device for sucking air of an upstream area of the flow passage in the preset moving direction from the gap to make the upstream area form a negative pressure; the negative pressure cavity is provided with a negative pressure port communicated to the negative pressure generating device, and an included angle between the axial direction of the negative pressure port and the discharging direction of the discharging port is within +/-15 degrees. The included angle between the axial direction of the negative pressure port and the discharging direction of the discharging port is set within the range of +/-15 degrees, the flowing direction of gas is changed, the upstream area is prevented from being directly sucked by the negative pressure port, the flaky melt is prevented from shaking, and the film forming quality of the flaky melt is improved.
Drawings
FIG. 1 is a schematic view of a structure of a casting apparatus provided herein;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an isometric view of the buffer chamber, negative pressure chamber, and moving carrier provided herein after installation.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.
The application provides a curtain coating device, specifically is an equipment for making the film product, and more specifically, this curtain coating device is used for making lithium cell diaphragm. And extruding the melt onto a movable carrier through an extruding device to form a flaky melt, and performing subsequent cooling and other processes on the flaky melt to obtain the lithium battery diaphragm.
In the following embodiments, the melt is a lithium battery diaphragm raw material in a molten state, and the sheet-shaped melt is a form of the lithium battery diaphragm raw material in the molten state, which is extruded by an extrusion device and then attached to a moving carrier.
Referring to fig. 1 and 2, the casting apparatus provided in the present embodiment mainly includes: the carrier 10, the extrusion device 20 and the underpressure chamber 30 are moved.
The moving carrier 10 may be continuously moved in a preset moving direction.
The extruding device 20 is located above the moving carrier 10, and is used for extruding the melt F onto the moving carrier 10, and the moving carrier 10 is used for carrying the melt F extruded by the extruding device 20, and enabling the melt F to form the sheet-shaped melt M on the moving carrier 10.
Specifically, the extruding device 20 has a discharge port 21 facing the moving carrier 10 for discharging, and the melt F is extruded onto the moving carrier 10 through the discharge port 21 by the extruding device 20, so as to form a sheet-shaped melt M on the moving carrier 10, wherein the sheet-shaped melt M is attached to the surface of the moving carrier 10.
A gap C is provided between the discharge port 21 and the moving carrier 10 so that the melt F forms a flow channel R between the discharge port 21 and the moving carrier 10. In other words, the runner R is attached to the moving carrier 10 in the discharging direction to form the sheet melt M.
It is understood that, in order to form the sheet-shaped melt M, the discharge port 21 is a slit-type discharge port, and the melt F passes through the slit-type discharge port to form the sheet-shaped melt M and is attached to the moving carrier 10. Of course, the slit type discharge ports have the same slit width to ensure the uniformity of the thickness of the sheet melt M. When the thickness of the flaky melt M needs to be changed, the slit width of the slit-type discharge port only needs to be adjusted adaptively.
A negative pressure chamber 30 is formed between the moving carrier 10 and the extruding device 20, the negative pressure chamber 30 is used for sucking air in an upstream area U (an area shown by a dotted line frame in fig. 2) of the flow channel R in the preset moving direction of the moving carrier 10 from the gap C so as to enable the upstream area U to form negative pressure, and the sheet-shaped melt M is tightly attached to the moving carrier 10 under the action of the negative pressure, so that the film forming quality is improved.
The negative pressure cavity 30 is provided with a negative pressure port 31 communicated with a negative pressure generating device, the negative pressure generating device works and sucks the negative pressure cavity 30 through the negative pressure port 31, so that negative pressure is generated in the negative pressure cavity 30, the negative pressure sucks the upstream area U through the gap C to suck air in the upstream area U, and the upstream area U generates negative pressure to generate a pulling force on the flaky melt M, so that the flaky melt M is ensured to be tightly attached to the movable carrier 10.
Of course, the air in the upstream region U is pumped away so that other impurities in the air do not enter the region, thereby preventing the other impurities from falling onto the sheet melt M, and thus, further improving the product quality.
In this embodiment, the above-mentioned suction force is formed by the negative pressure generating device sucking the air in the upstream region U through the negative pressure port 31, the negative pressure chamber 30, and the clearance C, and if the negative pressure port 31 and the clearance C are substantially on the same horizontal plane, the negative pressure port 31 directly sucks the clearance C, and the sheet melt M is likely to shake to affect the film forming quality. Therefore, the included angle alpha between the axial direction of the negative pressure port 31 arranged on the negative pressure cavity 30 and the discharging direction of the discharging port 21 is set within the range of +/-15 degrees, so that the flowing direction of the gas is changed, the negative pressure port 31 is prevented from directly sucking the upstream area U through the clearance C, the flaky melt M is prevented from shaking, and the film forming quality of the flaky melt M is improved.
In some embodiments, when a thicker sheet melt M is to be produced, a greater pulling force is required to attract the sheet melt M. Thus, the negative pressure port 31 with the included angle α between the axial direction and the discharging direction of the discharging port 21 set within the range of ± 15 ° can avoid the film forming quality from being affected by the larger shaking of the sheet melt M caused by the direct alignment of the excessive pulling force to the gap C.
Of course, in other embodiments, a baffle or a porous baffle may be disposed in the cover 32 near the negative pressure port 31 to change the flow direction of the gas to avoid the direct pulling effect.
In a preferred embodiment, the angle α is preferably 0 °, i.e., the axial direction of the negative pressure port 31 is parallel to the discharge direction of the discharge port 21.
In this application, the melt F is a lithium battery diaphragm raw material in a molten state, and the flow channel R is a lithium battery diaphragm raw material of the sheet-shaped melt M on the discharge port 21 and the movable carrier 10 of the melt F extruded from the extruding device 20. Lithium battery diaphragm usually forms three layer construction's slice fuse-element M by three kinds of lithium battery diaphragm raw materials complex, and is corresponding, according to the required raw materials kind of lithium battery diaphragm, aforementioned extrusion device 20 is three-layer coextrusion die head, and three-layer coextrusion die head has three runner chambeies that communicate to the die lip (promptly, discharge gate 21), and three kinds of different lithium battery diaphragm raw materials assemble discharge gate 21 through three runner chambeies to form three-layer composite structure's slice fuse-element M (lithium battery diaphragm) after discharge gate 21 discharges.
In the above embodiment, the triple-layer co-extrusion die head is arranged obliquely, and the included angle β between the axial direction of the negative pressure port 31 and the horizontal plane is the oblique angle of the triple-layer co-extrusion die head, and the included angle β is usually within the range of 55 ° ± 15 °.
In this embodiment, the movable carrier 10 is a carrying roller that can rotate continuously around its own rotation axis along a preset rotation direction, as shown in fig. 1, and the arc arrow indicates that the preset rotation direction of the carrying roller is counterclockwise. The roll surface of the carrier roll is used for carrying the melt F extruded from the discharge port 21 of the extruding device 20, so that the melt F forms a sheet-shaped melt M on the roll surface of the carrier roll.
In one embodiment, the carrier roller is a cooling roller, and the sheet-shaped melt M can be directly cooled, so that the sheet-shaped melt M has a supporting property to form a lithium battery separator. Specifically, the cooling roller cools the sheet-like melt M by water cooling.
Of course, in other embodiments, cooling rollers may also be provided in the output direction of the carrier roller to cool the sheet-like melt M.
In this embodiment, unstable fluctuation can appear in the in-process that increases in the negative pressure chamber 30, can make the flaky fuse-element produce the fluctuation and influence the film quality equally, for this fluctuation of buffering, the casting device that this application provided still includes: and the buffer cavity 40 is communicated between the negative pressure cavity 30 and the negative pressure generating device, when negative pressure fluctuation occurs in the negative pressure cavity 30, airflow in the buffer cavity 40 and the negative pressure cavity 30 realizes bidirectional flow, and transient pressure increase or decrease occurring in the negative pressure cavity 30 can be rapidly balanced by the negative pressure in the buffer cavity 40. Thereby buffering the negative pressure fluctuation in the negative pressure chamber 30.
The negative pressure chamber 30 comprises a cover 32, the cover 32 is arranged between the movable carrier 10 and the extrusion device 20, so that the cover 32, the extrusion device 20 and the movable carrier 10 enclose the negative pressure chamber 30, and the negative pressure port 31 is arranged on the cover 32.
With continued reference to fig. 1, a negative pressure pipe 50 is connected to the negative pressure port 31, and one end of the negative pressure pipe 50 is connected to the negative pressure port 31 and the other end is connected to the buffer chamber 40. The axial direction of one end of the negative pressure pipe 50 coincides with the axial direction of the negative pressure port 31.
In the present application, a plurality of the negative pressure ports 31 are provided, and the negative pressure tube 50 is connected to each negative pressure port 31. The casting apparatus provided by the present application further includes: and a plurality of connection pipes 60, each connection pipe 60 being a high temperature resistant flexible connection pipe, one end of each connection pipe 60 being connected to the other end of the negative pressure pipe 50, and the other end being connected to the buffer chamber 40.
Referring to fig. 3, the aforementioned housing 32 includes: a first side plate 321, a second side plate 322, a connecting plate 323 and two end plates 324. The first side plate 321 is connected to the side of the extruding device 20, one end of the second side plate 322 is in contact with the movable carrier 10, the connecting plate 323 is connected between the first side plate 321 and the second side plate 322, and the two end plates 324 are respectively located at two ends of the first side plate 321 and the second side plate 322, so that the first side plate 321, the second side plate 322, the connecting plate 323, the two end plates 324, the extruding device 20, and the movable carrier 10 enclose the negative pressure cavity 30. The aforementioned negative pressure port 31 is opened in the connecting plate 323.
In some embodiments, when the negative pressure in the negative pressure chamber 30 fluctuates unstably, the larger the volume of the negative pressure chamber 30, the less disturbance the fluctuation causes. Based on this, as shown in fig. 1, the position of the negative pressure port 31 may be translated to the upper right, or the parts of the side of the extrusion device 20 facing the negative pressure chamber 30 may be made small to reduce the space area occupied by the extrusion device 20, or any one of the two end plates 324 of the cover 32 may be moved to increase the internal volume of the negative pressure chamber 30.
In conclusion, the casting device that this application provided, through the contained angle that sets for between the axial direction of negative pressure mouth and the ejection of compact direction of discharge gate at the within range of 15, and change gaseous flow direction, avoid the negative pressure mouth directly to drag the upper reaches region, avoid the slice fuse-element to appear the shake, and improve the film forming quality of slice fuse-element.
The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. It will be apparent to those skilled in the art from this disclosure that many more simple derivations or substitutions can be made without departing from the inventive concepts herein.
Claims (10)
1. A casting apparatus, characterized by comprising:
a movable carrier which can continuously move along a preset moving direction;
the extruding device is used for extruding the melt onto the moving carrier to form a sheet-shaped melt, is positioned above the moving carrier and is provided with a discharge port which faces the moving carrier and is used for discharging; a gap is formed between the discharge port and the movable carrier, and a flow channel is formed between the melt and the discharge port and the movable carrier;
a negative pressure chamber formed between the moving carrier and the extrusion device for sucking air of an upstream area of the flow passage in the preset moving direction from the gap to make the upstream area form a negative pressure; the negative pressure cavity is provided with a negative pressure port communicated to the negative pressure generating device, and an included angle between the axial direction of the negative pressure port and the discharging direction of the discharging port is within +/-15 degrees.
2. The casting apparatus of claim 1, further comprising: and the buffer cavity is communicated between the negative pressure cavity and the negative pressure generating device and is used for buffering negative pressure intensity fluctuation in the negative pressure cavity.
3. The casting apparatus of claim 2, wherein the negative pressure chamber comprises a hood disposed between the moving carrier and the extrusion apparatus to enclose the negative pressure chamber with the extrusion apparatus and the moving carrier, the negative pressure port opening on the hood.
4. The casting apparatus of claim 3, wherein a negative pressure tube is connected to the negative pressure port, one end of the negative pressure tube being connected to the negative pressure port, the other end being connected to the buffer chamber; the axial direction of the negative pressure pipe is coincided with the axial direction of the negative pressure port.
5. Casting apparatus according to claim 4, wherein said negative pressure port is provided in plurality, and said negative pressure pipe is connected to each of said negative pressure ports; the casting apparatus further includes: and one end of the connecting pipe is connected with the other end of the negative pressure pipe, and the other end of the connecting pipe is connected with the buffer cavity.
6. Casting apparatus according to claim 5, wherein said connection tube is a high temperature resistant flexible connection tube.
7. The casting apparatus of claim 3, wherein the shroud comprises: the connecting plate comprises a first side plate, a second side plate, a connecting plate and two end plates; the first side plate is connected to the extrusion device, one end of the second side plate is in contact with the movable carrier, the connecting plate is connected between the first side plate and the second side plate, the two end plates are respectively positioned at two ends of the first side plate and the second side plate, and the negative pressure port is formed in the connecting plate; the first side plate, the second side plate, the connecting plate, the two end plates, the extruding device and the movable carrier are enclosed to form the negative pressure cavity.
8. Casting apparatus according to claim 1, wherein said moving support comprises a carrier roller continuously rotatable about its own axis in a preset rotation direction, said preset movement direction being said preset rotation direction.
9. The casting apparatus of claim 8, wherein the carrier roll is a chill roll.
10. The casting apparatus of claim 1, wherein the outlet is a slit-type outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922483956.2U CN212498594U (en) | 2019-12-30 | 2019-12-30 | Casting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922483956.2U CN212498594U (en) | 2019-12-30 | 2019-12-30 | Casting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212498594U true CN212498594U (en) | 2021-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922483956.2U Active CN212498594U (en) | 2019-12-30 | 2019-12-30 | Casting device |
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| CN (1) | CN212498594U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113635532A (en) * | 2021-08-09 | 2021-11-12 | 界首市天鸿新材料股份有限公司 | PP/PE/PP three-layer co-extrusion lithium battery power diaphragm casting device |
-
2019
- 2019-12-30 CN CN201922483956.2U patent/CN212498594U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113635532A (en) * | 2021-08-09 | 2021-11-12 | 界首市天鸿新材料股份有限公司 | PP/PE/PP three-layer co-extrusion lithium battery power diaphragm casting device |
| CN113635532B (en) * | 2021-08-09 | 2023-07-28 | 界首市天鸿新材料股份有限公司 | PP/PE/PP three-layer co-extrusion lithium battery power diaphragm casting device |
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