Feed filter plate for high dryness dewatering

Abstract

This invention belongs to the field of filter press technology, and specifically relates to a feed filter plate for high dryness dewatering. The feed filter plate for high dryness dewatering includes a sealed frame (10), a core plate (20), and a media channel (30). A filter layer is provided on the surface of the core plate (20), comprising a grid (42), a perforated plate (43), a metal mesh (44), and a filter cloth (41). The filter cloth (41) is located on the surface of the metal mesh (44). The edge of the filter cloth (41) is fixed to a filter cloth fixing groove (50) located on the core plate (20). At least two filter cloth fixing grooves (50) are provided, and the space covered by the filter cloth (41) between adjacent filter cloth fixing grooves (50) forms a buffer space (80). This invention, through improvements to the filter layer structure and filter cloth fixing method, makes the feed filter plate less prone to deformation or damage under high pressure, and is suitable for use in high dryness dewatering filter presses.

Description

Technical Field

[0001] This invention belongs to the field of filter press technology, and specifically relates to a feed filter plate for high dryness dewatering. Background Technology

[0002] High-dryness dewatering filter presses are increasingly favored by the market due to their high pressing efficiency. However, they need to operate under high pressure, making the filter plates prone to deformation or damage. How to improve the strength of the filter plates under high-pressure operating conditions is an important research topic.

[0003] To increase filter plate strength, existing technologies generally replace some or all of the non-metallic materials of the filter plate with metal. Chinese patent document CN211635375U discloses a novel filter plate for a filter press, which has a metal filter plate frame that surrounds the filter plate body. A feed inlet is located at the center of the filter plate, and liquid outlet holes are located at the four corners. Filter cloth is applied to the surface of the filter plate body. This solution can improve the filter plate strength to a certain extent. However, under high-pressure operating conditions, leakage is prone to occur due to the gap between the metal filter plate frame and the filter plate body. Chinese patent document CN212854780U discloses a metal filter plate for a hot-drying diaphragm filter press, and Chinese patent document CN 210583852U discloses a combined guide rail structure for a metal plate and frame filter press. Both involve filter plates made entirely of metal. The former has its feed inlet located at the center of the metal filter plate, while the latter has its feed inlet located at the upper edge of the metal filter plate. However, the aforementioned improvements in the existing technology mainly target the main structure of the filter plate, with few improvements to the fixing methods of the filter layer and filter cloth. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a feed filter plate for high dryness dehydration, so that the filter layer of the feed filter plate is not easily damaged under high pressure and can work normally.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] The feed filter plate for high dryness dehydration includes a sealed frame, a core plate, and a media channel. A filter layer is provided on the surface of the core plate. The filter layer includes a filter cloth, the edge of which is fixed to a filter cloth fixing groove on the core plate. A sealing strip is embedded in the filter cloth fixing groove. The sealed frame and the core plate form a pressing chamber. The media channel is located in the sealed frame. The filter layer also includes a grid, a perforated plate, and a metal mesh. The filter cloth is located on the surface of the metal mesh.

[0007] The inventive concept of this invention is to place all media channels within the sealed frame portion, eliminating voids in the core plate to ensure structural strength. Furthermore, the filter layer on the core plate is divided into four layers: from the inside out, a grid, a perforated plate, a metal mesh, and a filter cloth. This design minimizes deformation and damage to both the core plate and the filter layer during operation. Simultaneously, the filter layer's resistance to deformation ensures sufficient channels for the outflow of pressed water between the filter cloth and the grid. In existing technologies, if the filter cloth and core plate adhere tightly under high pressure, it increases the resistance to water outflow, thus affecting pressing efficiency. The filter layer's resistance to deformation under high pressure protects the core plate, making it less prone to deformation, thereby resulting in higher overall structural strength for the filter plate.

[0008] As an improvement, the sealing frame and the core plate are integrally cast from metal materials to enhance the overall structural strength of the feed filter plate.

[0009] As an improvement, the core plate has a thickness of 5-10 mm, the grid has a thickness of 3-6 mm, the perforated plate has a thickness of 1-4 mm, and the metal mesh has a thickness of 1-3 mm. The thickness of the filter layer on one side of the core plate is basically the same as the thickness of the core plate.

[0010] As a further improvement, the pressing chamber is octagonal, with each hypotenuse corresponding to a media channel, which increases the distance between the edge of the pressing chamber and the media channel, thereby reducing the impact of high pressure on the media channel.

[0011] As an improvement, the core plate is provided with a guide portion at the junction with the sealing frame portion, and the filter cloth fixing groove on the core plate is located on the guide portion.

[0012] As a further improvement, at least two filter cloth fixing grooves are provided, and the space covered by the filter cloth between adjacent filter cloth fixing grooves forms a buffer space. The edge of the filter cloth is located outside the filter cloth fixing groove or inside the filter cloth fixing groove.

[0013] Having at least two filter cloth fixing grooves enhances the filter cloth's hold, preventing the edges from being pulled out under high pressure. If the inner groove loosens, the outer groove provides a second line of defense. If the inner groove loosens, mud and water can easily enter the buffer space. Within the buffer space, the inner groove prevents sufficient pressure to force the mud and water out of the outer groove, thus improving the filter cloth's sealing performance. If a third groove is installed, the likelihood of mud and water penetration is even lower.

[0014] As an improvement, the filter cloth fixing groove has two grooves, both located at the edge of the core plate.

[0015] As a further improvement, the edge of the filter cloth is wrapped with a sealing strip located in the outer filter cloth fixing groove and then hidden inside the inner filter cloth fixing groove. If the edge of the filter cloth is not hidden, it tends to be lifted under pressure, facilitating the entry of mud and water into the gap between the filter cloth fixing groove and the filter cloth. In this application, the edge of the filter cloth is wrapped with a sealing strip located in the outer filter cloth fixing groove and then hidden inside the inner filter cloth fixing groove. This not only makes the filter cloth less likely to be lifted, but also ensures that the buffer space is covered by two layers of filter cloth, while other areas are covered by only one layer of filter cloth. This results in relatively lower pressure in the buffer space, reducing the possibility of mud and water in the buffer space further passing through the second filter cloth fixing groove.

[0016] As a further improvement, the edge of the filter cloth is located inside the outermost filter cloth fixing groove to avoid direct contact between the edge of the filter cloth and the high-pressure mud and water.

[0017] As a further improvement, the filter cloth fixing groove is a dovetail groove or a spherical groove.

[0018] In summary, the present invention has the advantages of simple structure and obvious effect. By improving the filter layer structure and filter cloth fixing method, the feed filter plate is not easily deformed or damaged under high pressure environment, making it suitable for use in high dryness dewatering filter press. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention;

[0020] Figure 2 for Figure 1 Sectional view along the middle AA direction;

[0021] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0022] Figure 4 This is a diagram showing the fit between part of the filter layer and the core board;

[0023] Figure 5 This is a schematic diagram of the filter cloth edge fixing method in Example 1;

[0024] Figure 6 This is a schematic diagram of the filter cloth edge fixing method in Example 2;

[0025] Figure 7 This is a schematic diagram of high-pressure slurry flowing from one side of the filter cloth through the filter cloth fixing groove to the other side in the prior art. The dashed line represents the movement path of the high-pressure slurry.

[0026] In the diagram: 10, sealing frame; 20, core plate; 21, guide section; 22, grid cavity; 23, perforated plate cavity; 24, metal mesh cavity; 30, media channel; 41, filter cloth; 42, grid; 43, perforated plate; 44, metal mesh; 50, filter cloth fixing groove; 60, sealing strip; 70, pressing chamber; 80, buffer space. Detailed Implementation

[0027] Example 1

[0028] like Figure 1 As shown, the feed filter plate for high dryness dehydration of the present invention consists mainly of a sealed frame portion 10 and a core plate 20 integrally cast from metal. The sealed frame portion 10 is square, with a media channel 30 at each of the four corners. The media channel 30 includes a feed inlet and a water outlet. A filter layer is provided on the surface of the core plate 20, and the two sides of the sealed frame portion 10 and the core plate 20 form a pressing chamber 70. In use, a diaphragm is located outside the pressing chamber 70. Pressurizing the diaphragm can squeeze the material inside the pressing chamber 70, and the water in the material is discharged from the water outlet after passing through the filter layer. The pressing chamber 70 is octagonal, and each hypotenuse of the octagon corresponds to a media channel 30.

[0029] The core board 20 has a thickness of 5-10mm, and a guide portion 21 is provided at the junction of the core board 20 and the sealing frame portion 10. For example... Figure 2-3 As shown, the guide section 21 has a grid cavity 22, a perforated plate cavity 23, and a metal mesh cavity 24 arranged from the inside out. Correspondingly, the filter layer includes, from the inside out: a grid 42, a perforated plate 43, a metal mesh 44, and a filter cloth 41. The grid cavity 22 is used to house the grid 42. The shape of the grid cavity 22 corresponds to the shape of the pressing chamber 70. The grids 42 are arranged in parallel within the grid cavity 22. The thickness of the grid 42 is 3-6 mm. The grid 42 improves the overall strength of the core plate 20 and also guides the pressed water. The perforated plate cavity 23 is used to house the perforated plate 43. The area of ​​the perforated plate cavity 23 is larger than the area of ​​the grid cavity 22. The thickness of the perforated plate 43 is 1-4 mm. The perforated plate 43 provides planar support for the filter cloth 41, preventing the filter cloth 41 from sticking to the grid 42 under high pressure, thus increasing the resistance to the pressed water flow. It also reduces the tensile force exerted by the filter cloth 41 on the filter cloth fixing groove 50 during operation. The metal mesh cavity 24 is used to house the metal mesh 44, which is 1-3 mm thick. The gaps between the metal meshes 44 are smaller than the aperture of the perforated plate 43. The metal mesh 44 serves as a buffer area between the perforated plate 43 and the filter cloth 41, and also helps to enhance the compressive strength of the filter cloth 41. Since the filter cloth 41 is generally about 1 mm thick, the filter cloth 41 located on the surface of the metal mesh 44 is also located within the metal mesh cavity 24. The structure of the grid 42, the perforated plate 43, the metal mesh 44, and their relationship with the core plate 20 are as follows: Figure 4 As shown.

[0030] like Figure 1 , Figure 5 As shown, the core plate 20 has two filter cloth fixing grooves 50 on the guide part 21. The cross-section of the filter cloth fixing groove 50 can be a dovetail groove or a spherical groove. The filter cloth fixing groove 50 is inlaid with a sealing strip 60 for fixing the edge of the filter cloth 41.

[0031] Figure 7 In the existing technology, the filter cloth 41 and the filter cloth fixing groove 50 are connected in such a way that, under high pressure, mud and water flow from one side of the filter cloth 41 through the filter cloth fixing groove 50 to the other side. This design changes the filter cloth fixing groove 50 to two loops, thus creating a buffer space 80 between adjacent filter cloth fixing grooves 50 covered by the filter cloth 41. The edge of the filter cloth 41 is located either outside or inside the filter cloth fixing groove 50. Preferably, it is located inside the filter cloth fixing groove 50.

[0032] like Figure 5 As shown, after the edge of the filter cloth 41 is wrapped with the sealing strip 60 located in the outer filter cloth fixing groove 50, it is hidden inside the inner filter cloth fixing groove 50. The method for fixing the filter cloth 41 is as follows:

[0033] 1. Lay the filter cloth 41 on the metal mesh 44 and cover all the filter cloth fixing grooves 50;

[0034] 2. Use sealing strip 60 to embed the filter cloth fixing groove 50 of the outer channel, and fix the filter cloth 41 in the filter cloth fixing groove 50 of the outer channel;

[0035] 3. Fold the edge of the filter cloth 41 so that the edge of the filter cloth 41 is above the filter cloth fixing groove 50 in the inner channel;

[0036] 4. Use sealing strip 60 to embed the filter cloth fixing groove 50 of the inner channel, and seal the edge of filter cloth 41 within the filter cloth fixing groove 50 of the inner channel.

[0037] Example 2

[0038] like Figure 6 As shown, the difference between Example 2 and Example 1 is that the edge of the filter cloth 41 is located inside the outer filter cloth fixing groove 50. The method for fixing the filter cloth 41 is as follows:

[0039] 1. Lay the filter cloth 41 on the metal mesh 44 and cover all the filter cloth fixing grooves 50;

[0040] 2. Use sealing strip 60 to embed the filter cloth fixing groove 50 in the inner channel, and fix the filter cloth 41 in the filter cloth fixing groove 50 in the inner channel.

[0041] 3. Position the edge of the filter cloth 41 above the outer filter cloth fixing groove 50;

[0042] 4. Use sealing strip 60 to embed the filter cloth fixing groove 50 of the outer channel, and seal the edge of filter cloth 41 within the filter cloth fixing groove 50 of the outer channel.

Claims

1. A feed filter plate for high dryness dewatering, comprising a sealing frame portion (10), a core plate (20), and a media channel (30), wherein a filter layer is provided on the surface of the core plate (20), the filter layer comprising a filter cloth (41), the edge of the filter cloth (41) being fixed to a filter cloth fixing groove (50) located on the core plate (20), a sealing strip (60) being embedded in the filter cloth fixing groove (50), and the sealing frame portion (10) and the core plate (20) forming a pressing chamber (70), characterized in that: The media channel (30) is located in the sealing frame part (10); the filter layer also includes a grid (42), a perforated plate (43), and a metal mesh (44), with the filter cloth (41) located on the surface of the metal mesh (44); the filter cloth fixing groove (50) is provided in at least two places, and the space covered by the filter cloth (41) between adjacent filter cloth fixing grooves (50) forms a buffer space (80), which is used to accommodate mud and water entering from the loose filter cloth fixing groove (50), and the edge of the filter cloth (41) is located inside the filter cloth fixing groove (50).

2. The feed filter plate for high dryness dewatering as described in claim 1, characterized in that: The sealing frame (10) and the core plate (20) are integrally cast from metal materials.

3. The feed filter plate for high dryness dewatering as described in claim 1, characterized in that: The core plate (20) has a thickness of 5-10 mm, the grid (42) has a thickness of 3-6 mm, the perforated plate (43) has a thickness of 1-4 mm, and the metal mesh (44) has a thickness of 1-3 mm.

4. The feed filter plate for high dryness dewatering as described in claim 1, characterized in that: The pressing chamber (70) is octagonal, and each hypotenuse in the octagon corresponds to a medium channel (30).

5. The feed filter plate for high dryness dewatering as described in claim 1, characterized in that: The core plate (20) has a guide portion (21) at the junction with the sealing frame portion (10), and the filter cloth fixing groove (50) on the core plate (20) is located on the guide portion (21).

6. The feed filter plate for high dryness dewatering as described in claim 1, characterized in that: The filter cloth fixing groove (50) consists of two grooves, both located at the edge of the core plate (20).

7. The feed filter plate for high dryness dewatering as described in claim 6, characterized in that: After the edge of the filter cloth (41) is wrapped with a sealing strip (60) located in the outer filter cloth fixing groove (50), it is hidden inside the inner filter cloth fixing groove (50).

8. The feed filter plate for high dryness dewatering as described in claim 6, characterized in that: The edge of the filter cloth (41) is located inside the outermost filter cloth fixing groove (50).

9. The feed filter plate for high dryness dewatering as described in claim 1, characterized in that: The filter cloth fixing groove (50) is a dovetail groove or a spherical groove.

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