A filtering device and method for diatomaceous earth

Abstract

The present application provides a filtering device and method for diatomite, belonging to the technical field of diatomite processing, comprising a liquid storage seat, a rotary drum, filter holes, filter cloth, a rotating source, a negative pressure pipeline and a scraper; an exhaust pipe which is arranged inside the negative pressure pipeline and is fixedly connected to an external exhaust pump, and the exhaust end of the exhaust pipe is arranged toward the direction of the scraper; a plurality of top support plates which are radially slidably connected inside the rotary drum and are distributed in a circumferential array, each of which is provided with a plurality of top support rings which correspond one to one with the filter holes, a plurality of guide rods which correspond one to one with the top support plates are arranged inside the rotary drum, and a knocking block is sleeved on the outside of each guide rod; the present application can reduce the probability that the diatomite is difficult to be effectively scraped off due to the depression of the filter cloth.

Description

Technical Field

[0001] The present application relates to the technical field of diatomite processing, and in particular to a filtering device and method for diatomite. Background Art

[0002] Diatomaceous earth is a natural mineral material, which is formed by the sedimentation of the remains of diatom plants. Its main components are silicon oxide, aluminum oxide and calcium oxide. Diatomaceous earth has the characteristics of strong hygroscopicity, good adsorption and high temperature resistance, so diatomaceous earth is often used as a filter material in water treatment or air purification processes. When using diatomaceous earth for water treatment, diatomaceous earth should be put into the liquid to be treated first, and the adsorption of diatomaceous earth is used to adsorb the free impurities in the liquid, and then the diatomaceous earth is filtered out from the liquid to obtain the purified liquid.

[0003] Referring to the Chinese patent document with authorization announcement number CN111085046B and announcement date June 29, 2021, entitled A Vacuum Drum Diatomaceous Earth Dry Separation Filtration Device, the device includes a frame, a discharge trough, a driving mechanism, a drum, a vacuum pump and a scraper. During its actual working process, the negative pressure air generated by the vacuum pump sucks the liquid in the discharge trough through the drum, and the diatomaceous earth in the liquid will adhere to the drum, thereby realizing vacuum drum negative pressure filtration, thereby effectively separating the diatomaceous earth and liquid, and finally scraping off the filtered diatomaceous earth through the scraper.

[0004] Referring to the above technical solution, for the vacuum drum negative pressure filtration method, during the filtration process of the drum, the liquid will first penetrate the filter cloth covering the outside of the drum, and then enter the lower-level pipeline through the filter holes evenly opened on the drum. However, due to the negative pressure effect, the filter cloth on the drum may form depressions at the filter holes of the drum. In this case, the diatomaceous earth filtered out of the filter cloth is more likely to gather in the depressions and block the filter holes, and it is difficult for the scraper to scrape off the diatomaceous earth that has fallen into the filter holes along with the filter cloth when working, which in turn affects the efficiency of subsequent filtration work. Summary of the invention

[0005] In view of this, the present application provides a filtering device and method for diatomaceous earth, which are mainly used to solve the problem that diatomaceous earth is difficult to be effectively scraped off due to the depression of the filter cloth.

[0006] In order to solve the above technical problems, the present application provides a filtering device and method for diatomaceous earth.

[0007] In the first aspect, the present application provides a filtering device for diatomaceous earth, comprising a liquid storage seat, a rotating drum, filter holes, filter cloth, a rotating source, a negative pressure pipe and a scraper; an exhaust pipe is arranged inside the negative pressure pipe and is fixedly connected to an external exhaust pump, and the exhaust end of the exhaust pipe is arranged in the direction of the scraper; a plurality of top support plates are radially slidably connected to the inside of the rotating drum and distributed in a circumferential array, each top support plate is provided with a plurality of top support rings corresponding to the filter holes one by one, a plurality of guide rods corresponding to the top support plates one by one are arranged inside the rotating drum, and a knocking block is sleeved on the outside of each guide rod.

[0008] By adopting the above technical solution, the positive pressure airflow generated by the exhaust pipe and the supporting effect of the supporting ring are used to restore the depressed part of the filter cloth, so that the scraper can effectively scrape off the diatomaceous earth on the filter cloth to avoid affecting the efficiency of subsequent filtering work.

[0009] Optionally, the guide rods are arranged at an angle, and the distal end of the guide rod based on the central axis of the drum passes through the middle of the top support plate and is connected to the inner arc wall of the drum, and the proximal end of the guide rod is reversely biased and connected to the chamber partition of the drum based on the rotation direction of the drum.

[0010] By adopting the above technical solution, the movement of the knocking block away from the central axis of the drum along the guide rod will be carried out before the top support plate moves from a position horizontal to the central axis of the drum to a position facing the scraper plate, so that the collision impact between the knocking block and the top support plate occurs in advance, thereby shaking off the diatomaceous earth on the filter cloth.

[0011] Optionally, the top support rings are all conical rings, and the large diameter opening of the top support ring is located in a direction away from the negative pressure pipe.

[0012] By adopting the above technical solution and utilizing the expanding design of the top support ring as a conical ring, the positive pressure airflow will diffuse in the circumferential direction of the top support ring when passing through the top support ring and inflate the filter cloth with a larger area, so that the filter cloth can be separated from the drum with a larger amplitude under the action of the positive pressure airflow, which is beneficial to the subsequent filtering work.

[0013] Optionally, the scraper is slidably connected to the liquid storage seat via a tension spring, and the scraper is tilted from top to bottom in a direction away from the rotating drum.

[0014] By adopting the above technical solution, with the cooperation of the tension spring, the scraper can slide adaptively on the liquid storage seat according to the thickness of the filter cloth, so it is suitable for scraping filter cloths of different thicknesses.

[0015] Optionally, the side wall of the scraper is detachably connected to a limiting wheel capable of abutting against the rotating drum via bolts, and the through holes on the scraper where the bolts are located are strip holes.

[0016] By adopting the above technical solution, personnel can detachably connect the limiting wheel to the side wall of the scraper disc by bolts according to actual usage requirements, thereby limiting the adaptive sliding range of the scraper disc to prevent the scraper disc from being too close to the filter cloth under the action of the tension spring and scratching the filter cloth.

[0017] In a second aspect, the present application provides a filtering method for diatomaceous earth, which is applied to a filtering device for diatomaceous earth described in the first aspect, and the filtering method comprises:

[0018] S1, firstly, putting diatomaceous earth into the liquid to be treated prepared in advance in the liquid storage seat, and waiting for the diatomaceous earth to absorb the impurities in the liquid to be treated;

[0019] S2, the rotation source drives the drum to rotate at a low speed, and at the same time, through the cooperation of the external negative pressure pump and the negative pressure pipeline, the liquid to be treated inside the liquid storage seat is sucked in and the filtering work is completed with the help of the filter cloth and the filter holes;

[0020] S3, during the rotation of the drum, the diatomaceous earth attached to the outer surface of the filter cloth is scraped off by the scraper.

[0021] By adopting the above technical solution, diatomaceous earth is used to adsorb free impurities in the liquid to be treated, and then the liquid to be treated is attracted toward the center of the drum by the cooperation of the negative pressure pipeline and the external negative pressure pump, so that the liquid to be treated passes through the filter cloth, the filter holes and the inner cavity of the drum in turn and is finally discharged from the negative pressure pipeline, thereby completing the filtration of the liquid to be treated.

[0022] Optionally, in S2, when the top support plate is submerged in the liquid to be treated in the liquid storage seat as the drum rotates, the knocking block will be pressed on the top support plate along the guide rod due to its own gravity. At this time, the top support plate will be maintained at a position away from the central axis of the drum due to the superposition of its own gravity and the pressure of the knocking block, so that the top support ring passes through the filter hole and continuously supports the filter cloth. At this time, there will be a certain gap between the filter cloth and the outer surface of the drum due to the action of the top support ring, so that the liquid to be treated can pass through the filter cloth over a large area to complete the filtration.

[0023] By adopting the above technical solution, the liquid to be treated can pass through the filter cloth over a large area, so that the liquid to be treated can not only pass through the filter cloth from the position facing the filter hole when the filter cloth is in contact with the drum, thereby improving the effective filtering capacity of the filter cloth to a certain extent.

[0024] Optionally, in S3, before the scraping work of the scraper is carried out, and the top support plate moves from a position horizontal to the central axis of the drum to a position opposite to the scraper plate as the drum rotates, a positive pressure airflow is generated in the direction of the scraper plate through the cooperation of an external exhaust pump and an exhaust pipe, and the collision impact force of the knocking block and the positive pressure airflow are utilized to move the top support plate in a direction away from the central axis of the drum, so that the top support ring generates a certain amount of vibration due to the collision impact of the knocking block while passing through the filter hole to support the filter cloth, and at the same time, the scraping work of the scraper plate is assisted by the cooperation of the positive pressure airflow.

[0025] By adopting the above technical solution, the top support plate will vibrate to a certain extent due to the collision and impact of the knocking block, so that the diatomaceous earth on the filter cloth is shaken off, reducing the burden of scraping work.

[0026] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0027] 1. During the scraping process of the scraper, the sunken part of the filter cloth is restored by positive pressure inflation and top support, so that the diatomaceous earth that is sunken along with the filter cloth and blocked inside the filter hole can be pushed out, reducing the probability that the diatomaceous earth is difficult to be effectively scraped off due to the depression of the filter cloth.

[0028] 2. When the sunken part of the filter cloth is restored, the impact generated by the knocking block and the top support plate is used to make the filter cloth vibrate, causing the diatomaceous earth on the filter cloth to be shaken off, thereby reducing the burden of scraping work.

[0029] 3. During the filtration process, a certain gap is created between the filter cloth and the outer surface of the drum, so that the liquid to be treated can pass through the filter cloth over a large area, reducing the probability that the liquid to be treated is difficult to quickly pass through the filter cloth due to the fit between the filter cloth and the drum, thereby increasing the effective filtration capacity of the filter cloth to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a filtration device for diatomaceous earth in the present application;

[0031] Figure 2 This is a schematic diagram of the structure of the drum and scraper for this application;

[0032] Figure 3 For this application Figure 2 A partial enlarged view of the middle area A;

[0033] Figure 4 This is a schematic diagram of the structure of the top support plate of this application;

[0034] Figure 5 A cross-sectional view of the drum of this application;

[0035] Figure 6 For this application Figure 1A partial enlarged view of the middle area B;

[0036] Figure 7 For this application Figure 2 A partial enlarged view of area C in the middle.

[0037] Explanation of the accompanying drawings: 1. liquid storage seat; 11. rotating drum; 12. filter hole; 13. filter cloth; 14. rotation source; 15. negative pressure pipeline; 16. scraper; 2. exhaust pipe; 3. top support plate; 31. top support ring; 32. guide rod; 33. knocking block; 4. tension spring; 5. bolt; 6. limit wheel. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 7 , the technical scheme of the embodiment of the present application is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0039] In a first aspect, the present application provides a filtering device for diatomaceous earth, which adopts the following technical solution:

[0040] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present embodiment provides a filtering device for diatomaceous earth, comprising a liquid storage seat 1 and a rotating drum 11 rotatably connected thereto, wherein the inner cavity of the rotating drum 11 is equally divided by a plurality of array-distributed dividing partitions, filter holes 12 are evenly provided on the rotating drum 11, a filter cloth 13 is provided on the outer surface of the rotating drum 11, a rotating source 14 for driving the rotating drum 11 to rotate is provided on the liquid storage seat 1, a negative pressure pipe 15 fixedly connected to an external negative pressure pump is rotatably connected to the inside of the rotating drum 11, and suction ports evenly provided on the negative pressure pipe 15 are connected to the inner cavity of the rotating drum 11, and a scraper 16 is provided on the liquid storage seat 1.

[0041] An exhaust pipe 2 that can be fixedly connected to an external exhaust pump is arranged inside the negative pressure pipeline 15, and the exhaust end of the exhaust pipe 2 is arranged in the direction of the scraper 16. A plurality of top support plates 3 distributed in a circumferential array are radially slidably connected inside the rotating drum 11, and each top support plate 3 is provided with a plurality of top support rings 31 corresponding to the filter holes 12 one by one. A plurality of guide rods 32 corresponding to the top support plates 3 one by one are arranged inside the rotating drum 11, and a knocking block 33 is sleeved on the outside of each guide rod 32.

[0042] When carrying out the filtering work, diatomaceous earth is first put into the liquid to be treated inside the liquid storage seat 1. After the diatomaceous earth absorbs the free impurities in the liquid to be treated, the negative pressure pipe 15, with the cooperation of the external negative pressure pump, attracts the liquid to be treated toward the center of the drum 11, so that the liquid to be treated passes through the filter cloth 13, the filter hole 12 and the inner cavity of the drum 11 in turn and is finally discharged from the negative pressure pipe 15.

[0043] At the same time, the rotating source 14 drives the drum 11 to rotate at a low speed, so that the top support plate 3 is submerged in the liquid to be treated in the liquid storage seat 1 as the drum 11 rotates. At this time, the knocking block 33 will be pressed on the top support plate 3 along the guide rod 32 due to its own gravity, and the top support plate 3 will be maintained at a position away from the central axis of the drum 11 due to the superposition of its own gravity and the pressure of the knocking block 33, so that the top support ring 31 passes through the filter hole 12 and continues to support the filter cloth 13. At this time, there will be a certain gap between the filter cloth 13 and the outer surface of the drum 11 due to the action of the top support ring 31, so that the liquid to be treated can pass through the filter cloth 13 over a large area, so as to prevent the liquid to be treated from only being able to pass through the filter cloth 13 from the position opposite to the filter hole 12 when the filter cloth 13 is in contact with the drum 11, thereby improving the effective filtration amount of the filter cloth 13 to a certain extent.

[0044] As the drum 11 continues to rotate, when the top support plate 3 reaches the highest point, the top support plate 3 will move toward a position close to the central axis of the drum 11 due to its own gravity; and when the top support plate 3 moves from a position horizontal to the central axis of the drum 11 to a position directly facing the scraper 16, the top support plate 3 and the knocking block 33 will move again in a direction away from the central axis of the drum 11 due to gravity, until the top support ring 31 passes through the filter hole 12 to prop up the filter cloth 13, and at the same time, the exhaust pipe 2 generates a positive pressure airflow in the direction of the scraper 16 through the cooperation of the external exhaust pump, so that the concave part of the filter cloth 13 is restored, so that the scraper 16 can scrape off the diatomaceous earth on the filter cloth 13. In addition, the top support plate 3 will also generate a certain amount of shaking due to the collision impact of the knocking block 33, so that the diatomaceous earth on the filter cloth 13 is shaken off, reducing the burden of scraping work.

[0045] Reference Figure 4 and Figure 5 The guide rods 32 are all inclined, and the distal end of the guide rod 32 based on the central axis of the drum 11 passes through the middle of the top support plate 3 and is connected to the inner arc wall of the drum 11, and the proximal end of the guide rod 32 is reversely biased and connected to the chamber partition of the drum 11 based on the rotation direction of the drum 11.

[0046] As the drum 11 continues to rotate, when the knocking block 33 slides along the guide rod 32 and collides with the top support plate 3, due to the inclined setting of the guide rod 32, the movement of the knocking block 33 along the guide rod 32 away from the central axis of the drum 11 will be carried out before the top support plate 3 moves from a position horizontal to the central axis of the drum 11 to a position facing the scraper plate 16, thereby causing the collision between the knocking block 33 and the top support plate 3 to occur in advance, so that the diatomaceous earth on the filter cloth 13 has sufficient time to be shaken off.

[0047] Reference Figure 3 , Figure 4 and Figure 5 The top support rings 31 are all conical rings, and the large-diameter openings of the top support rings 31 are located in a direction away from the negative pressure pipe 15 .

[0048] By utilizing the expansion design of the top support ring 31 as a conical ring, the positive pressure airflow will diffuse in the circumferential direction of the top support ring 31 when passing through the top support ring 31 and inflate the filter cloth 13 with a larger area, so that the filter cloth 13 is separated from the drum 11 with a larger amplitude under the action of the positive pressure airflow, which is beneficial to the subsequent filtering work.

[0049] Reference Figure 1 and Figure 6 The scraper 16 is slidably connected to the liquid storage seat 1 through the tension spring 4, and the scraper 16 is tilted from top to bottom in a direction away from the drum 11.

[0050] With the cooperation of the tension spring 4, the scraper 16 can slide adaptively on the liquid storage seat 1 according to the thickness of the filter cloth 13, so as to be suitable for scraping filter cloths 13 of different thicknesses. After the scraper 16 scrapes the diatomaceous earth on the filter cloth 13, the inclined design of the scraper 16 can make the diatomaceous earth fall automatically into the recovery container prepared in advance under the scraper 16, thereby reducing the collection burden of personnel.

[0051] Reference Figure 2 and Figure 7 The side wall of the scraper 16 is detachably connected to a limiting wheel 6 capable of abutting against the rotating drum 11 through a bolt 5, and the through hole on the scraper 16 where the bolt 5 is located is a strip hole.

[0052] According to actual use requirements, personnel can detachably connect the limiting wheel 6 to the side wall of the scraper 16 through the bolt 5, thereby limiting the adaptive sliding range of the scraper 16 to prevent the scraper 16 from being too close to the filter cloth 13 under the action of the tension spring 4 and scratching the filter cloth 13.

[0053] The implementation principle of a filtration device for diatomaceous earth in the embodiment of the present application is:

[0054] When carrying out the filtering work, diatomaceous earth is first put into the liquid to be treated inside the liquid storage seat 1. After the diatomaceous earth absorbs the free impurities in the liquid to be treated, the negative pressure pipe 15, with the cooperation of the external negative pressure pump, attracts the liquid to be treated toward the center of the drum 11, so that the liquid to be treated passes through the filter cloth 13, the filter hole 12 and the inner cavity of the drum 11 in turn and is finally discharged from the negative pressure pipe 15.

[0055] At the same time, the rotating source 14 drives the drum 11 to rotate at a low speed, so that the top support plate 3 is submerged in the liquid to be treated in the liquid storage seat 1 as the drum 11 rotates. At this time, the knocking block 33 will be pressed on the top support plate 3 along the guide rod 32 due to its own gravity, and the top support plate 3 will be maintained at a position away from the central axis of the drum 11 due to the superposition of its own gravity and the pressure of the knocking block 33, so that the top support ring 31 passes through the filter hole 12 and continues to support the filter cloth 13. At this time, there will be a certain gap between the filter cloth 13 and the outer surface of the drum 11 due to the action of the top support ring 31, so that the liquid to be treated can pass through the filter cloth 13 over a large area, so as to prevent the liquid to be treated from only being able to pass through the filter cloth 13 from the position opposite to the filter hole 12 when the filter cloth 13 is in contact with the drum 11, thereby improving the effective filtration amount of the filter cloth 13 to a certain extent.

[0056] As the drum 11 continues to rotate, when the top support plate 3 reaches the highest point, the top support plate 3 will move toward a position close to the central axis of the drum 11 due to its own gravity; and when the top support plate 3 moves from a position horizontal to the central axis of the drum 11 to a position directly facing the scraper 16, the top support plate 3 and the knocking block 33 will move again in a direction away from the central axis of the drum 11 due to gravity, until the top support ring 31 passes through the filter hole 12 to prop up the filter cloth 13, and at the same time, the exhaust pipe 2 generates a positive pressure airflow in the direction of the scraper 16 through the cooperation of the external exhaust pump, so that the concave part of the filter cloth 13 is restored, so that the scraper 16 can scrape off the diatomaceous earth on the filter cloth 13. In addition, the top support plate 3 will also generate a certain amount of shaking due to the collision impact of the knocking block 33, so that the diatomaceous earth on the filter cloth 13 is shaken off, reducing the burden of scraping work.

[0057] In a second aspect, the present application provides a filtering method for diatomaceous earth, which is applied to a filtering device for diatomaceous earth in the first aspect, and the filtering method comprises:

[0058] S1, firstly, putting diatomaceous earth into the liquid to be treated prepared in advance in the liquid storage seat 1, and waiting for the diatomaceous earth to absorb the impurities in the liquid to be treated;

[0059] S2, the rotating source 14 drives the drum 11 to rotate at a low speed, and at the same time, through the cooperation of the external negative pressure pump and the negative pressure pipe 15, the liquid to be treated inside the liquid storage seat 1 is sucked in and the filtering work is completed with the help of the filter cloth 13 and the filter hole 12;

[0060] S3, during the rotation of the drum 11, the diatomaceous earth attached to the outer surface of the filter cloth 13 is scraped off by the scraper 16.

[0061] In S2, when the top support plate 3 is submerged in the liquid to be treated in the liquid storage seat 1 as the drum 11 rotates, the knocking block 33 will be pressed on the top support plate 3 along the guide rod 32 due to its own gravity. At this time, the top support plate 3 will be maintained at a position away from the central axis of the drum 11 due to the superposition of its own gravity and the pressure of the knocking block 33, so that the top support ring 31 passes through the filter hole 12 and continues to support the filter cloth 13. At this time, there will be a certain gap between the filter cloth 13 and the outer surface of the drum 11 due to the action of the top support ring 31, so that the liquid to be treated can pass through the filter cloth 13 over a large area to complete the filtration.

[0062] In S3, before the scraping work of the scraper 16 is carried out, and the top support plate 3 moves from a position horizontal to the central axis of the drum 11 to a position opposite to the scraper 16 as the drum 11 rotates, a positive pressure airflow is generated in the direction of the scraper 16 through the cooperation of the external exhaust pump and the exhaust pipe 2, and the collision impact force of the knocking block 33 and the positive pressure airflow are used to move the top support plate 3 in a direction away from the central axis of the drum 11, so that the top support ring 31 generates a certain amount of vibration due to the collision impact of the knocking block 33 while passing through the filter hole 12 to support the filter cloth 13, and at the same time, the scraping work of the scraper 16 is assisted by the cooperation of the positive pressure airflow.

[0063] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A filtration device for diatomaceous earth, comprising a liquid storage seat (1), a rotating drum (11), filter holes (12), a filter cloth (13), a rotating source (14), a negative pressure pipeline (15) and a scraper (16), characterized in that: Also includes: An exhaust pipe (2) is arranged to penetrate the interior of the negative pressure pipeline (15) and is fixedly connected to an external exhaust pump, and the exhaust end of the exhaust pipe (2) is arranged in the direction of the scraper (16); A plurality of top support plates (3) are radially slidably connected inside the rotary drum (11) and are distributed in a circumferential array, each of the top support plates (3) is provided with a plurality of top support rings (31) corresponding one-to-one to the filter holes (12), a plurality of guide rods (32) corresponding one-to-one to the top support plates (3) are provided inside the rotary drum (11), and a knocking block (33) is sleeved on the outside of each guide rod (32); The guide rods (32) are all arranged obliquely, and the distal end of the guide rods (32) based on the central axis of the drum (11) passes through the middle of the top support plate (3) and is connected to the inner arc wall of the drum (11), and the proximal end of the guide rods (32) is connected to the chamber partition of the drum (11) in a reverse biased manner based on the rotation direction of the drum (11); The top support ring (31) is a conical ring, and the large-diameter opening of the top support ring (31) is located in a direction away from the negative pressure pipe (15); The scraper (16) is slidably connected to the liquid storage seat (1) via a tension spring (4), and the scraper (16) is arranged to be inclined from top to bottom in a direction away from the rotating drum (11).

2. A filtration device for diatomaceous earth according to claim 1, characterized in that: The side wall of the scraper (16) is detachably connected to a limiting wheel (6) capable of abutting against the rotating drum (11) via bolts (5), and the through-holes on the scraper (16) where the bolts (5) are located are strip-shaped holes.

3. A filtering method for diatomaceous earth, applied to the filtering device for diatomaceous earth according to claim 1, the filtering method comprising: S1, firstly, putting diatomaceous earth into the liquid to be treated which is prepared in advance in the liquid storage seat (1), and waiting for the diatomaceous earth to absorb the impurities in the liquid to be treated; S2, the rotating source (14) drives the rotating drum (11) to rotate at a low speed, and at the same time, through the cooperation of the external negative pressure pump and the negative pressure pipeline (15), the liquid to be treated inside the liquid storage seat (1) is sucked in and the filtering work is completed with the help of the filter cloth (13) and the filter hole (12); S3, during the rotation of the drum (11), the diatomaceous earth attached to the outer surface of the filter cloth (13) is scraped off by the scraper (16).

4. A filtration method for diatomaceous earth according to claim 3, characterized in that: In S2, when the top support plate (3) is submerged in the liquid to be treated in the liquid storage seat (1) as the drum (11) rotates, the knocking block (33) is pressed against the top support plate (3) along the guide rod (32) due to its own weight. At this time, the top support plate (3) is kept at a position away from the central axis of the drum (11) due to the superposition of its own weight and the pressure of the knocking block (33), so that the top support ring (31) passes through the filter hole (12) and continuously supports the filter cloth (13). At this time, a certain gap exists between the filter cloth (13) and the outer surface of the drum (11) due to the action of the top support ring (31), so that the liquid to be treated can pass through the filter cloth (13) over a large area to complete the filtration.

5. A filtration method for diatomaceous earth according to claim 3, characterized in that: In the above S3, before the scraping work of the scraper (16) is carried out, and the top support plate (3) moves from a position horizontal to the central axis of the drum (11) to a position directly opposite to the scraper (16) as the drum (11) rotates, a positive pressure airflow is generated in the direction of the scraper (16) by the cooperation of the external exhaust pump and the exhaust pipe (2), and the top support plate (3) is moved in a direction away from the central axis of the drum (11) by the collision impact force of the knocking block (33) and the positive pressure airflow, so that the top support ring (31) generates a certain vibration due to the collision impact of the knocking block (33) while passing through the filter hole (12) to support the filter cloth (13), and at the same time, the scraping work of the scraper (16) is assisted by the cooperation of the positive pressure airflow.

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