Filtration device

Abstract

The present invention provides a filtering device, wherein a soft filter screen is loosely wrapped around a rotating surface of a belt transmission mechanism formed by a belt strip, and the belt strip is arranged at intervals along the length direction of a driving roller and a driven roller. In the above scheme, a section of the filter screen is placed in a filter pool containing a solution so that one side of the filter screen faces the water flow direction, and then the filter screen is driven by a belt to rotate so as to remove the filter screen where a certain amount of broken leather fibers have accumulated from the solution, thereby facilitating further cleaning of the filter screen. At the same time, due to the loose wrapping of the filter screen, the filter screen made of gauze will not be subjected to excessive tensile force, and its mesh can maintain the original contour shape instead of the slit holes after stretching.

Description

Technical Field

[0001] The invention relates to the field of rice paper manufacturing, in particular to a filtering device for an aqueous solution for manufacturing rice paper. Background Art

[0002] In the process of making rice paper, the sandalwood pulp needs to be boiled, then bleached, and then washed. The calcium hypochlorite solution after washing contains a large amount of broken skin or fiber. If the washing liquid is directly dumped, it will pollute the environment and cause waste of broken skin or fiber. Therefore, it is necessary to separate the broken skin in the calcium hypochlorite solution and reuse the collected broken skin or fiber to achieve the purpose of reducing costs. If the traditional direct filtration method is used, the broken skin or fiber is easy to accumulate on the filter screen, causing the filter screen to be blocked, and it is difficult to directly collect the broken skin or fiber on the filter screen.

[0003] Chinese patent CN102861475A in the prior art discloses a belt filter, which comprises a filter cloth sleeved on a conveyor belt and moving synchronously with the conveyor belt, one end of which is a filtering section in contact with the solution, the other end is a draining section, and a washing section is between the two sections. However, in the step of separating the broken skin in the calcium hypochlorite solution in the rice paper manufacturing process, gauze is usually required to be used as a filter screen for filtering. The structural strength of the gauze itself is relatively low. If it is tightly sleeved on the conveyor belt, the gauze is very likely to be torn due to a slight deviation or vibration of the conveyor belt. At the same time, if the gauze is tightly sleeved on the belt, the tension of the gauze itself is very likely to cause the gauze to stretch, and the small holes on the gauze are easily deformed, elongated and narrowed, affecting the filtering work. Summary of the invention

[0004] The purpose of the invention is to provide a filtering device to prevent the gauze filter screen set on the belt from being torn.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a filtering device, a soft filter mesh is loosely wrapped around the rotating surface of a belt transmission mechanism composed of belt strips, and the belt strips are arranged at intervals along the length direction of the driving roller and the driven roller.

[0006] In the above scheme, a section of the filter screen is placed in a filter pool containing a solution so that one side of the filter screen faces the direction of the water flow, and then the filter screen is driven by a belt to rotate so as to remove the filter screen where a certain amount of broken leather fibers have accumulated from the solution, so as to facilitate further cleaning of the filter screen. At the same time, due to the loose surrounding of the filter screen, the filter screen made of gauze will not be subjected to excessive tensile force, and its mesh holes can maintain the original contour shape instead of the slit holes after stretching. At the same time, the loose arrangement can effectively prevent the gauze from being flattened, and can maintain certain wrinkles, forming grooves at the wrinkles or increasing friction, so as to prevent the broken leather fibers attached to the gauze from falling off the gauze early, and ensure that as many broken leather fibers as possible are taken out of the solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the three-dimensional installation position of the present invention;

[0008] Figure 2 It is a schematic diagram of the installation position of the present invention;

[0009] Figure 3 It is a schematic diagram of the structure of the present invention;

[0010] Figure 4 It is a schematic diagram of the belt strip structure;

[0011] Figure 5 yes Figure 4 A partial enlarged view of . DETAILED DESCRIPTION

[0012] A filtering device, a soft filter net 10 is loosely wrapped around the rotating surface of a belt transmission mechanism 20 composed of a belt strip 21, and the belt strip 21 is arranged at intervals along the length direction of a driving roller 22 and a driven roller 23.

[0013] In the above scheme, a section of the filter screen 10 is placed in the filter pool 1 containing the solution so that one side of the filter screen 10 faces the direction of the water flow, and then the filter screen 10 is driven by a belt to rotate so as to take out the filter screen 10 where a certain amount of broken skin fibers have accumulated from the solution, so as to facilitate further cleaning of the filter screen 10. At the same time, due to the loose surrounding of the filter screen 10, the filter screen 10 made of gauze will not be subjected to excessive tensile force, and its mesh can maintain the original contour shape instead of the slit hole after stretching. At the same time, during actual use, the linear speed of the filter screen 10 and the belt strip 21 are different. Once the belt strip 21 is stuck, vibrated, or deviated, the slippage and loose margin of the filter screen 10 can be used to eliminate the influence, so as to prevent the fluctuation of the belt strip 21 from causing a large pulling force on the filter screen 10 and causing the tearing of the filter screen 10. At the same time, the belt strips 21 arranged at intervals also facilitate the solution to pass through the intervals between the belt strips 21 after passing through the filter screen 10, so as to avoid the strict belt surface from hindering the flow of the solution. At the same time, the loose arrangement can effectively prevent the gauze from being flattened and can maintain certain wrinkles, forming grooves or increasing friction at the wrinkles, thereby preventing the broken skin fibers attached to the gauze from falling off the gauze prematurely and ensuring that as many broken skin fibers as possible are taken out of the solution.

[0014] The driving roller 22 and the driven roller 23 are arranged at an angle to the horizontal plane.

[0015] That is, the filter device is arranged obliquely. In actual use, the lower section of the filter device is inserted into the filter tank 1 as a filter section, and the filter screen 10 facing the water flow direction moves from bottom to top to take out the broken skin fibers in the solution.

[0016] The outer belt surface of the belt strip 21 is toothed or corrugated.

[0017] In this way, the belt strip 21 and the filter screen 10 are in linear contact, which can prevent the belt surface of the belt strip 21 from being attached to the filter screen 10, and the filter screen 10 at the belt strip 21 can still allow the solution to pass through and play its filtering role. At the same time, the gauze between adjacent teeth will form a net bag structure due to gravity and loose arrangement. The net bag structure can accommodate more broken leather fibers, prevent the broken leather fibers attached to the gauze from falling off the gauze early, and ensure that as many broken leather fibers as possible are taken out of the solution.

[0018] The filter 10 is provided with baffles 30 on both sides. The baffles 30 are slat-shaped and the overall surface of the baffles is parallel to the mesh surface of the filter 10. The length direction of the slats of the baffles 30 is consistent with the conveying direction of the filter 10, and the spacing between the two baffles 30 is smaller than the width of the filter 10.

[0019] The baffle plate 30 in the above scheme can be set on the side wall of the filter pool 1, with the upper end of the baffle plate 30 exposed to the liquid surface and the lower end reaching the bottom of the pool, and the baffle plate 30 needs to be set on the upstream surface of the filter screen 10, so that the water flow can only flow between the two baffle plates 30 to reach the filter screen 10. Due to the spacing between the two baffle plates 30, the water flow will directly rush to the filter screen 10 instead of passing through the two sides of the filter screen 10, so as to maximize the passage of all water through the filter screen 10 to achieve a better filtering effect.

[0020] A debris separation unit 40 is provided at the back area of ​​the filter screen 10 above the liquid surface.

[0021] The movement of the filter 10 brings the broken leather fibers in the solution to above the liquid surface. Since the adhesion between the broken leather fibers and the filter 10 is relatively strong, a separation unit 40 is required to separate the broken leather fibers from the filter 10. At the same time, the separation unit 40 arranged in the back area of ​​the filter 10 is not easy to flush the broken leather fibers back into the solution.

[0022] The belt strip 21 is composed of parallelogram-shaped unit segments 211 stacked end to end, with step teeth formed between adjacent unit segments 211, and the step surface 212 facing the movement direction of the belt strip 21. The plane where all the tooth top lines 213 of the upper belt strip 21 are located fits with the inner surface of the filter screen 10, making it easier for the screen to capture fibers.

[0023] In the above scheme, the belt strip 21 can be directly cast from a mold, or it can be formed by connecting a number of unit sections 211. The connection method of the unit sections 211 can be a side overlap connection or an end overlap connection. The angle between the step surface 212 and the filter screen 10 is the largest, so that the friction force at the tooth top line 213 is large, which can easily drive the filter screen 10 to move. The filter screen 10 also forms a line contact only at the tooth top line 213, avoiding excessive fitting.

[0024] The separation unit 40 includes nozzles for spraying clean water or air flow onto the filter screen 10 . The nozzles are evenly spaced along the roller core direction of the driving roller 22 and form a water curtain or air curtain covering the width direction of the filter screen 10 .

[0025] In the above scheme, the broken skin fibers adhering to the filter screen 10 are washed off by air flow or water flow, and then the broken skin fibers are collected for further processing. The setting of the water curtain or air curtain ensures that it can effectively wash every position of the filter screen 10 to prevent leakage.

[0026] The spraying point of the first nozzle 41 is located in front of the apex of the filter screen 10 , and the overall spraying direction of the first nozzle 41 is downward.

[0027] In the above scheme, the top of the filter screen 10 refers to the top line of the reversing section at the top of the filter screen 10, and the front refers to the front of the moving direction of the filter screen 10, so that the water flow or air flow sprayed by the first nozzle 41 can wash down the broken leather fibers on the filter screen 10 that pass through the top, and at the same time, in order to prevent the washed solids from returning to the filter pool 1 by crossing the top again, it is set to spray the water flow or air flow downward. At the same time, the water flow or air flow of the first nozzle 41 falls on the reversing section of the filter screen 10, where the filter screen 10 is relatively tight, which is convenient for the first nozzle 41 to use a larger water pressure or air pressure for spraying.

[0028] The second nozzle 42 is located inside the filter 10 , and the spraying direction of the second nozzle 42 is toward the inside of the rear filter.

[0029] One or both of the first nozzle 41 and the second nozzle 42 can be set according to the actual separation difficulty. Since the broken skin fibers are too small and distributed on the outside of the filter 10, the nozzle that directly sprays to the outside of the filter 10 is likely to press the broken skin fibers into the gaps of the filter 10, causing the filter 10 to be blocked and affecting the filtration efficiency. Therefore, the second nozzle 42 is set on the inside of the filter 10, and water or air flow is sprayed from the inside to the outside to flush out the blocked or difficult to separate broken skin fibers.

[0030] A rectangular material guide tray 50 for guiding materials obliquely downward is provided below the separation unit 40 , the upper end of the material guide tray 50 is arranged adjacent to the filter screen 10 , a material receiving and draining bucket 60 is provided at the lower end of the material guide tray 50 , and upward material blocking flanges 51 are provided on both sides of the material guide tray 50 .

[0031] In the above scheme, the broken skin fibers separated by the separation unit 40 will fall on the material guide tray 50, and then enter the material receiving and draining bucket 60 along the material guide tray 50. The function of the material retaining flange 51 is to prevent the broken skin fibers from escaping from both sides of the material guide tray 50, so that they can only enter the material receiving and draining bucket 60 from the lower end. Since the separated broken skin fibers are relatively moist, and the broken skin fibers separated by washing with clean water have a large amount of water, a draining bucket is required to further separate the water.

Claims

1. A filtering device, characterized in that: A soft filter screen (10) is loosely wrapped around a rotating surface of a belt transmission mechanism (20) formed by a belt strip (21), and the belt strip (21) is arranged at intervals along the length direction of a driving roller (22) and a driven roller (23); The surfaces where the driving roller (22) and the driven roller (23) are located are arranged at an angle to the horizontal plane; The outer belt surface of the belt strip (21) is toothed or corrugated; A debris separation unit (40) is provided in the back area above the liquid surface of the filter screen (10); The belt strip (21) is composed of parallelogram-shaped unit sections (211) stacked end to end, with step teeth formed between adjacent unit sections (211), and the step surface (212) faces the movement direction of the belt strip (21) at that location. The plane where all the tooth top lines (213) of the upper belt strip (21) are located fits with the inner surface of the filter screen (10) at that location, so that the screen surface can capture fibers.

2. The filtering device according to claim 1, characterized in that: Shielding plates (30) are arranged on both sides of the filter screen (10); the shielding plates (30) are in the shape of slats and the plate surface is parallel to the mesh surface of the filter screen (10); the length direction of the slats of the shielding plates (30) is consistent with the conveying direction of the filter screen (10); and the spacing between the two shielding plates (30) is smaller than the width of the filter screen (10).

3. The filtering device according to claim 1, characterized in that: The separation unit (40) comprises nozzles for spraying clean water or air flow onto the filter screen (10), the nozzles being evenly spaced along the roller core direction of the driving roller (22) and forming a water curtain or an air curtain covering the width direction of the filter screen (10).

4. The filtering device according to claim 3, characterized in that: The spraying point of the first nozzle (41) is located in front of the apex of the filter screen (10), and the overall spraying direction of the first nozzle (41) is downward.

5. The filtering device according to claim 3, characterized in that: The second nozzle (42) is located on the inner side of the filter screen (10), and the spraying direction of the second nozzle (42) is toward the inner side of the rear filter screen.

6. The filtering device according to claim 1, characterized in that: A rectangular material guide tray (50) for guiding material obliquely downward is provided below the separation unit (40); the upper end of the material guide tray (50) is arranged adjacent to the filter screen (10); a material receiving and draining bucket (60) is provided at the lower end of the material guide tray (50); and upward material blocking flanges (51) are provided on both sides of the material guide tray (50).

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