阅读说明：本技术 一种薄膜刮液系统 (Film liquid scraping system ) 是由 郅立鹏 赵吉良 刘晓磊 张天贵 王健 孙启龙 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种薄膜刮液系统,具体涉及一种环状薄片薄膜刮液系统。本发明的薄膜刮液系统包括用于传输薄膜的上传动辊和下传动辊,还包括设于所述上传动辊和下传动辊之间、用于刮除所述薄膜两面液体的两片薄片。本发明的薄膜刮液系统采用环状薄片刮液,避免了刮液辊将刮下的液体重新带回膜面上,刮液效率高,同时还可以将一些固体颗粒物清除,提高了隔膜的外观和品质。(The invention relates to a film liquid scraping system, in particular to an annular thin film liquid scraping system. The film liquid scraping system comprises an upper transmission roller and a lower transmission roller which are used for transmitting a film, and also comprises two sheets which are arranged between the upper transmission roller and the lower transmission roller and used for scraping liquid on two sides of the film. The film liquid scraping system adopts the annular sheet to scrape liquid, avoids the liquid scraped by the liquid scraping roller from being brought back to the film surface again, has high liquid scraping efficiency, can remove some solid particles, and improves the appearance and the quality of the diaphragm.)

1. The utility model provides a liquid system is scraped to film, is including last driving roller and the lower driving roller that is used for transmitting the film, its characterized in that still including locating go up between driving roller and the lower driving roller, be used for striking off two sheets of film two sides liquid.

2. The thin film doctor blade system as claimed in claim 1, wherein said two sheets are joined together as a single, annular sheet.

3. The thin film doctor blade system as claimed in claim 2, wherein said annular sheet is an annular steel strip.

4. The thin film doctor blade system as claimed in claim 2, wherein said annular sheet has a thickness of no more than 0.5 mm.

5. The film wiping system of any one of claims 2 to 4, wherein the edge of the annular sheet that contacts the film is curved.

6. The film wiping system as defined in claim 5, wherein a tension roller is provided at one side end of said annular sheet for tensioning said annular sheet.

7. The film wiping system as defined in claim 6, wherein a driving pulley for circularly transporting the annular sheet is provided at the other side end of the annular sheet.

8. The film wiping system of claim 7, wherein the two side ends of the ring-shaped sheet are provided with a rotating mechanism for adjusting the turning angle of the ring-shaped sheet, and the rotating mechanism is sleeved on the driving pulley and the tensioning pulley.

9. The film doctor blade system as claimed in claim 8, wherein a cleaning sheet for removing residue on said ring-shaped sheet is provided on the rotating mechanism of at least one side of said ring-shaped sheet.

10. The film scraping system of claim 8, wherein the rotating mechanisms at the two sides are respectively connected to a fixed connecting seat, and the fixed connecting seats at the two sides are respectively disposed on two opposite side plates in the liquid tank.

Technical Field

The invention relates to a film liquid scraping system, in particular to an annular thin film liquid scraping system.

Background

In the production process of the wet lithium battery diaphragm, extraction is a very critical and necessary process link, and the white oil in the diaphragm is extracted by using dichloromethane extraction liquid, so that the diaphragm forms a micropore which is through from front to back.

When the diaphragm is extracted and comes out of the extraction liquid and enters subsequent equipment, a large amount of extraction liquid is attached to the surface of the diaphragm, so that the appearance and the quality of the lithium battery diaphragm need to be improved, and the waste of the extraction liquid is reduced. The prior art mainly uses a liquid scraping roller to scrape liquid, and obtains the optimal liquid scraping effect by adjusting the relative position of the liquid scraping roller and the tension of a film.

However, the liquid scraping roller presses the membrane surface to reduce the amount of the extraction liquid on the membrane surface, and the disadvantages are that the liquid scraping roller can adhere to the extraction liquid, and the rotating liquid scraping roller can bring the scraped extraction liquid to the diaphragm again; on the other hand, the diameter of the liquid scraping roller is large, only part of the extracting agent is squeezed out when the film surface is rotationally squeezed, and a large amount of extracting agent is conveyed to the next liquid scraping roller along with the diaphragm along with the rotation of the liquid scraping roller.

In the prior art, partial improvement is made aiming at the defects, one of the problems is solved no matter the position of the liquid scraping roller is adjusted to increase the tension of a diaphragm, or an extracting agent adhered to the liquid scraping roller in the rotating process is removed at any time, the problem cannot be solved fundamentally, and the liquid scraping effect is not ideal.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a film liquid scraping system, which adopts an annular sheet to scrape liquid, avoids the phenomenon that a liquid scraping roller brings scraped liquid back to a film surface again, has high liquid scraping efficiency, can remove some solid particles, and improves the appearance and the quality of a diaphragm.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a liquid system is scraped to film, is including last driving roller and the lower driving roller that is used for transmitting the film, still including locating between last driving roller and the lower driving roller, be used for scraping two sheets of film two sides liquid. The upper transmission roller is arranged above the liquid level, and the lower transmission roller is arranged below the liquid level. The two sheets scrape the liquid from the film from both sides of the film. For the subsequent process of lithium battery diaphragm extraction, the film is the lithium battery diaphragm, the liquid level refers to the extraction liquid level in the extraction tank, and the liquid is extraction liquid.

Further, the two sheets are connected together and form an integral annular sheet, and the film passes through the middle of the annular sheet. When the annular sheet inclines, the two width surfaces of the annular sheet scrape liquid from the two surfaces of the film respectively.

Preferably, the annular sheet is an annular steel belt. The annular sheets described below may be the above-described annular steel strips.

More preferably, the annular sheet has a thickness of not more than 0.5 mm.

Further preferably, the edge of the annular sheet in contact with the film is curved. The edge of the annular sheet is very thin, so that liquid on the flat film surface can be very easily and completely scraped off when the annular sheet is attached to the film surface, and the film cannot be damaged when liquid is scraped due to the arc-shaped edge, smooth transition and no acute angle.

Meanwhile, the liquid scraped from the membrane surface directly flows into the liquid tank from the annular sheet and cannot be brought back to the annular sheet again.

Furthermore, a tensioning wheel for tensioning the annular sheet is arranged at one side end of the annular sheet. And the tension of the annular sheet is adjusted to an ideal state by adjusting the tension wheel so as to ensure the straightness of the edge of the annular sheet and the rigidity of the annular sheet in the liquid scraping process.

And a driving belt wheel for circularly conveying the annular sheets is arranged at the other side end of the annular sheets.

And rotating mechanisms for adjusting the turnover angle of the annular sheet are arranged at two side ends of the annular sheet and are sleeved on the driving belt wheel and the tensioning wheel. The rotating mechanism adjusts the edge of the annular sheet to contact and separate from the film through overturning, and adjusts the contact pressure with the film.

Further, the rotating mechanism comprises a driving end rotating seat and a driven end rotating seat which are respectively sleeved on the driving belt wheel and the tensioning wheel.

And a cleaning sheet for removing residual stains on the annular sheet is arranged on the rotating mechanism at least at one side end of the annular sheet. The annular sheet scrapes off not only dichloromethane extractant but also dust particles attached to the surface of the film, and residue formed by the dichloromethane extractant and the dust particles is accumulated at the edge of the scraper for a long time to scratch the film surface. The driving belt wheel and the tension wheel are matched to enable the annular sheet to be circularly conveyed and to form relative motion with the cleaning sheet, so that the residual stains are scraped.

The rotating mechanisms at the two side ends are respectively connected with fixed connecting seats, and the fixed connecting seats at the two side ends are respectively arranged on two opposite side plates in the liquid tank, namely on two opposite side plates in the extraction tank.

Compared with the prior art, the invention has the following advantages:

(1) the annular slice is adopted for scraping liquid, so that the situation that the scraped liquid is brought back to the film surface by the liquid scraping roller in the prior art is avoided, the slice scraping efficiency is higher, and meanwhile, the film surface cannot be damaged due to the arc design of the edge of the slice.

(2) The annular sheet can be turned over at an angle and tensioned, so that the contact pressure with the film can be adjusted, and the straightness and the rigidity of the sheet are ensured; meanwhile, the circular transmission of the annular sheet and the design of the cleaning sheet can effectively remove residual stains on the sheet.

Drawings

FIG. 1 is a schematic partial side view of an annular sheet wiping system in accordance with example 1 of the present invention;

FIG. 2 is a partial perspective view of an annular sheet wiping system according to example 1 of the present invention;

fig. 3 is an overall schematic view of an annular sheet wiping system according to embodiment 1 of the present invention.

Description of reference numerals: 1-an extraction tank, 2-a lower driving roller, 3-a diaphragm, 4-an annular steel belt, 5-an upper driving roller, 6-a fixed connecting seat, 7-a driven end rotating seat, 8-a tensioning wheel, 9-a driving end rotating seat, 10-a driving belt wheel and 11-a cleaning sheet.

Detailed Description

The technical solutions of the present invention will be described in further detail below by way of examples with reference to the accompanying drawings, but they should not be construed as limiting the scope of the present invention.

Example 1

A film liquid scraping system, the film in this embodiment is a lithium battery diaphragm, as shown in fig. 1 and fig. 2, includes an upper driving roller 5 and a lower driving roller 2 for conveying the diaphragm 3, and further includes an annular steel belt 4 disposed between the upper driving roller 5 and the lower driving roller 2 for scraping extraction liquid on both sides of the diaphragm 3. The upper driving roller 5 is arranged above the liquid level, and the lower driving roller 2 is arranged below the liquid level. The diaphragm 3 passes through the middle of the annular steel strip 4. When the annular steel belt 4 is inclined, both width surfaces of the annular steel belt 4 scrape the liquid from both surfaces of the diaphragm 3, respectively.

In a preferred embodiment, the thickness of the annular steel strip 4 does not exceed 0.5 mm.

In a further preferred embodiment, the edge of the annular steel strip 4 in contact with the membrane 3 is curved. The edge of the annular steel belt 4 is very thin, liquid on the flat film surface can be very easily scraped completely when the film surface is attached, and the diaphragm 3 cannot be damaged when the liquid is scraped due to the arc-shaped edge, smooth transition and no acute angle.

Meanwhile, the liquid scraped from the membrane surface directly flows into the extraction tank from the annular steel strip 4 and cannot be brought back to the annular steel strip 4 again.

As shown in fig. 3, a tension wheel 8 for tensioning the annular steel belt 4 is provided at one end of the annular steel belt 4. The tension of the annular steel belt 4 is adjusted to an ideal state by adjusting the tension pulley 8 so as to ensure the straightness of the edge of the annular steel belt 4 and the rigidity of the annular steel belt 4 in the liquid scraping process.

The other side end of the annular steel belt 4 is provided with a driving pulley 10 for circularly conveying the annular steel belt 4.

And rotating mechanisms for adjusting the turning angle of the annular steel belt 4 are arranged at two side ends of the annular steel belt 4, and are sleeved on the driving belt wheel 10 and the tensioning wheel 8. The rotating mechanism adjusts the edge of the annular steel strip 4 to contact and separate from the diaphragm 3 through overturning, and adjusts the contact pressure with the diaphragm 3.

The rotating mechanism comprises a driving end rotating seat 9 and a driven end rotating seat 7 which are respectively sleeved on the driving belt wheel 10 and the tensioning wheel 8.

The driving end rotating seat 9 is provided with a cleaning sheet 11 for removing residual stains on the annular steel belt 4. The annular steel belt 4 scrapes off not only the dichloromethane extractant but also some dust particles attached to the surface of the membrane from the membrane 3, and residue formed by the dichloromethane extractant and the dust particles is accumulated at the edge of the scraper for a long time to scratch the membrane surface. The driving pulley 10 and the tension pulley 8 are matched to enable the annular steel belt 4 to circularly convey and form relative movement with the cleaning sheet 11, so that the residual stains are scraped.

The driving end rotating seat 9 and the driven end rotating seat 7 are respectively connected with a fixed connecting seat 6, and the fixed connecting seats 6 at the two side ends are respectively arranged on two opposite side plates in the extraction tank.

While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.