Filter pressing device for sludge treatment

Abstract

The invention relates to the technical field of plate-and-frame filter pressing devices, in particular to a filter pressing device for sludge treatment. Comprising a machine frame, a pressing unit, a discharging unit and a control system are arranged on the machine frame, a plurality of supporting frames are arranged on the machine frame in a sliding mode, the supporting frames are fixedly connected with filter cloth, through holes for materials to pass through are formed in the middles of the filter cloth, and the supporting frames are provided with flow guide holes which are symmetrically distributed; the supporting frame is fixedly connected with two symmetrically-distributed first supporting plates and two symmetrically-distributed second supporting plates through a plurality of springs, the two first supporting plates are located on the two sides of the supporting frame, and the two second supporting plates are located on the two sides of the supporting frame respectively. The first supporting plate and the second supporting plate are arranged to extrude the adjacent filter cloth, so that the overall deformation rate of the filter cloth is effectively controlled, the good permeability of the filter cloth is maintained, the continuous filtering performance of the filter cloth is improved, and the dehydration uniformity of each area of a filter cake is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of plate and frame filter press technology, and more particularly to a filter press for sludge treatment. Background Technology

[0002] In the field of sludge dewatering, plate and frame filter presses are widely used in the dewatering of sludge from municipal sewage and industrial wastewater due to their simple structure and reliable operation. However, in actual operation, it has been found that as sludge accumulates in the filter chamber, the sludge buildup gradually puts pressure on the filter cloth, causing it to expand and deform locally. This rapid local deformation increases the pore size of the filter cloth, making it easier for sludge particles to penetrate into the filter cloth, clogging the filtrate channels, increasing the resistance to filtrate permeation, and reducing the overall filtration efficiency.

[0003] As sludge is continuously injected, the deformation of the filter cloth increases and becomes uneven. This unevenness leads to inconsistent drainage rates in different areas of the filter cloth, resulting in varying degrees of dewatering of the filter cake in different regions. Ultimately, this leads to increased moisture content in the filter cake, unstable sludge quality, and affects dewatering efficiency and subsequent treatment. Summary of the Invention

[0004] In order to overcome the problems mentioned in the background art, the present invention provides a filter press device for sludge treatment.

[0005] The technical solution is: a filter press device for sludge treatment, including a frame, a pressing unit, a discharge unit and a control system are provided on the frame, a plurality of support frames are slidably arranged on the frame, a filter cloth is fixedly connected to the support frames, a through hole for material to pass through is provided in the middle of the filter cloth, and a symmetrically distributed guide hole is provided in the support frames. The support frame is fixed with two symmetrically distributed first support plates and two symmetrically distributed second support plates by multiple springs. The two first support plates are located on both sides of the support frame, and the two second support plates are located on both sides of the support frame. Both the first support plates and the second support plates are used to compress the adjacent filter cloth.

[0006] Preferably, the through holes on two adjacent filter cloths are staggered, which facilitates the material inside the through holes being squeezed so that the water inside can pass through the adjacent filter cloths.

[0007] Preferably, a fixing sleeve is fixedly connected to the flow guide hole on the support frame, and the fixing sleeve is used to insert into the corresponding flow guide hole on the adjacent support frame.

[0008] Preferably, the support frame is fixedly connected with a plurality of limiting posts, and the support frame is provided with a plurality of limiting holes, the limiting holes being used to limit the corresponding limiting posts.

[0009] Preferably, the filter cloth is provided with protrusions, and the support frame is provided with grooves. The protrusions are used to squeeze adjacent filter cloths into the corresponding grooves.

[0010] Preferably, both the first support plate and the second support plate are fixedly connected with uniformly distributed protrusions, and the protrusions are in contact with the adjacent filter cloth.

[0011] Preferably, both the first support plate and the second support plate are provided with multiple guide grooves, which are used to guide water droplets to flow downwards.

[0012] Preferably, the system further includes multiple limiting units, the number of which is twice the number of the support frames, and the limiting units are disposed on adjacent support frames. The limiting unit includes multiple fixing plates, each fixedly connected to an adjacent support frame. Each fixing plate has an inclined surface. The multiple fixing plates are divided into two groups, each group of fixing plates sharing a sliding frame. A tension spring is fixedly connected between the sliding frame and an adjacent support frame. The first support plate and the second support plate are slidably connected to the adjacent sliding frames, and the first support plate and the second support plate are rotatably connected. The two groups of fixing plates are used to limit the adjacent first support plate and the adjacent second support plate, respectively. The elastic coefficient of the spring is greater than the elastic coefficient of the tension spring.

[0013] Preferably, the system further includes multiple extrusion units, the number of which is the same as the number of support frames, and the extrusion units are disposed on adjacent support frames; The extrusion unit includes multiple reciprocating screws, each of which is rotatably mounted on an adjacent support frame. Multiple drive motors are fixedly connected to the support frame, the number of which is the same as the number of reciprocating screws. The output shaft of each drive motor is fixedly connected to an adjacent reciprocating screw. Each reciprocating screw is threaded with a sliding block that is slidably connected to an adjacent support frame. The sliding block is used to extrude adjacent first support plates and adjacent second support plates.

[0014] Preferably, the support frame is fixedly connected to an air guide pipe, the air guide pipe is provided with uniformly distributed jet nozzles, and the air guide pipe is used to guide gas to blow against the adjacent first support plate and the adjacent second support plate.

[0015] Compared with existing technologies, the technical effects achieved by this invention are as follows: By setting a first support plate and a second support plate to apply compression and limiting to adjacent filter cloths, this invention effectively controls the overall deformation rate of the filter cloths. This structural design can suppress the abnormal expansion of the partial pores of the filter cloth, reduce the phenomenon of sludge particles penetrating and clogging the micropores of the filter cloth, thereby maintaining the good permeability of the filter cloth and improving its continuous filtration performance. At the same time, since the deformation of the filter cloth tends to be uniform during operation, the drainage rate is more consistent, significantly improving the dewatering uniformity of each area of ​​the filter cake, reducing the fluctuation of the filter cake moisture content, and improving the stability of the sludge quality. By limiting the first support plate and the second support plate respectively by two fixed plates, the deformation rate of the first support plate and the second support plate is controlled, thereby ensuring that adjacent filter cloths can expand uniformly with the injection of sludge, ensuring the consistency of pressure and drainage rate distribution during dewatering, thereby improving the uniformity of filter cake dewatering and the stability of sludge quality, while extending the service life of the filter cloths. By moving the sliding block, the first support plate and the second support plate are further driven to squeeze the filter plate, further driving out the water in the sludge. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the support frame and fixing sleeve of the present invention; Figure 3 This is a three-dimensional structural diagram of the first support plate and the second support plate of the present invention; Figure 4 This is a cross-sectional view of the support frame and filter cloth of the present invention; Figure 5 This is a cross-sectional view of the first support plate and the second support plate of the present invention; Figure 6 This is a three-dimensional structural diagram of the first support plate and the fixing plate of the present invention; Figure 7 This is a three-dimensional structural diagram of the fixing plate and tension spring of the present invention; Figure 8 This is a three-dimensional structural diagram of the reciprocating lead screw and sliding block of the present invention.

[0017] The labels in the diagram are as follows: 1. Frame, 2. Support frame, 3. Filter cloth, 4. Through hole, 5. Guide hole, 6. Fixing sleeve, 7. Limiting post, 8. Limiting hole, 9. Protrusion, 10. Groove, 11. Spring, 12. First support plate, 13. Second support plate, 14. Protruding post, 15. Guide groove, 16. Fixing plate, 17. Sliding frame, 18. Tension spring, 19. Reciprocating screw, 20. Drive motor, 21. Sliding block, 22. Air guide pipe. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: A filter press device for sludge treatment, referring to... Figures 1-5 As shown, the device includes a frame 1, on which a pressing unit, a unloading unit, and a control system are mounted. A material injection pipe and a drainage pipe are located on the right side of the frame 1. Eight evenly distributed support frames 2 (this number is shown in the attached drawing and can be adjusted according to actual conditions) are slidably mounted on the frame 1. Chambers (as shown in the attached drawing) are located on both the left and right sides of each support frame 2. Figure 1 Taking the central direction as an example, the following descriptions of directions are all appendices. Figure 1 (In the direction of the middle), a filter cloth 3 is fixed to the support frame 2, and the filter cloth 3 covers two chambers on the adjacent support frame 2. The filter cloth 3 is provided with a through hole 4 for sludge material to pass through in the middle. The support frame 2 is provided with two symmetrically distributed guide holes 5, and both guide holes 5 are connected to the lower part of the two chambers on the adjacent support frame 2 to guide water away from the upper chambers of the support frame 2. The support frame 2 is fixed with two symmetrically distributed first support plates 12 and two symmetrically distributed second support plates 13 by multiple springs 11. The two first support plates 12 are located in the two chambers of the support frame 2 respectively, and the two second support plates 13 are located in the two chambers of the support frame 2 respectively. In the two chambers of the support frame 2, the first support plate 12 and the second support plate 13 are used to squeeze the adjacent filter cloth 3, which helps the filter cloth 3 to deform evenly and reduces the phenomenon of sludge particles penetrating and clogging the micropores of the filter cloth 3, thereby maintaining the good permeability of the filter cloth 3. The pressing unit works to squeeze the eight support frames 2 to fit together. Subsequently, sludge material is injected into the injection pipe. The sludge material enters between two adjacent filter cloths 3 through the through hole 4. Under the pressure of the sludge material, the water in the sludge material passes through the filter cloth 3 and enters the chamber of the adjacent support frame 2. Subsequently, the water is discharged through the guide hole 5, completing the sludge pressure filtration treatment.

[0020] Reference Figures 2-4As shown, the through holes 4 on two adjacent filter cloths 3 are staggered, which facilitates the squeezing of sludge material in the through holes 4 so that the water inside can pass through the adjacent filter cloths 3; a fixing sleeve 6 is fixed to the guide hole 5 on the support frame 2, and the fixing sleeve 6 is used to insert into the corresponding guide hole 5 on the adjacent support frame 2; two symmetrical limiting posts 7 are fixed to the left side of the support frame 2, and two symmetrical limiting holes 8 are provided on the right side of the support frame 2. The limiting holes 8 are used to limit the corresponding limiting posts 7. As the two limiting posts 7 are inserted into the two adjacent limiting holes 8, the two fixing sleeves 6 are inserted into the two adjacent guide holes 5, so that the two support frames 2 are aligned and fitted together; three protrusions 9 are provided on the filter cloth 3 (see attached). Figure 4 As shown in the figure, the filter cloth 3 has one protrusion 9 on the left side and two protrusions 9 on the right side. The support frame 2 has three grooves 10 (see attached figure). Figure 4 As shown, the support frame 2 has two grooves 10 on the left side and one groove 10 on the right side. As two adjacent support frames 2 are fitted together, the protrusions 9 squeeze the adjacent filter cloths 3 into the corresponding grooves 10, causing the two adjacent filter cloths 3 to bend and interlock at the joint, thus improving the sealing between the two adjacent filter cloths 3. The first support plate 12 and the second support plate 13 are both fixed with evenly distributed protrusions 14. The filter cloth 3 deforms and fits against the evenly distributed protrusions 14. The protrusions 14 contact the adjacent filter cloths 3. Under the limiting action of the protrusions 14, the deformation area of ​​the filter cloth 3 is controlled, which helps the filter cloth 3 to deform evenly. At the same time, under the support action of the protrusions 14, a gap is formed between the filter cloth 3 and the first support plate 12 and the second support plate 13, which facilitates the water droplets passing through the filter cloth 3 to enter the guide hole 5 and be discharged. The first support plate 12 and the second support plate 13 are both provided with multiple guide grooves 15, which are used to guide the water droplets to flow downward.

[0021] The specific working principle is as follows: First, connect the existing sludge pump to the injection pipe on the frame 1, and connect the drain pipe to the external pipeline. Then, start the clamping unit through the control system. The clamping unit works to make the eight support frames 2 gradually fit together. During this process, the limiting post 7 is inserted into the adjacent limiting hole 8, and the fixing sleeve 6 is inserted into the adjacent guide hole 5. Finally, the guide holes 5 on the eight support frames 2 form a cylindrical pipe connected to the drain pipe. Then, start the sludge pump to pump the sludge into the injection pipe. The sludge is injected into the space between two adjacent filter cloths 3 through the injection pipe. Then, guided by the through hole 4, the sludge material fills the space between the filter cloths 3.

[0022] During the sludge injection process, the water in the sludge passes through the filter cloth 3 and enters the cavity of the support frame 2 through the filter cloth 3, and then is discharged from the drain pipe through the guide hole 5. As the sludge is continuously injected, the sludge will compress and deform the filter cloth 3. The deformed filter cloth 3 fits the protrusion 14. At the same time, under the limiting action of the first support plate 12 and the second support plate 13, the filter cloth 3 undergoes slow and uniform deformation. During this process, the first support plate 12 and the second support plate 13 are pressed and move, compressing the spring 11. At this time, under the elastic action of the spring 11, the protrusion 14 on the first support plate 12 and the protrusion 14 on the second support plate 13 pass through the filter cloth 3 to feed the sludge material. The sludge is squeezed to allow water in the sludge to pass through the filter cloth 3 and adhere to the surfaces of the first support plate 12 and the second support plate 13. At the same time, water droplets gather in the guide channel 15 and flow downwards, accelerating the dewatering of the sludge material. After injecting a specified amount of sludge, the sludge pump is stopped. After controlling the water for a period of time, the control system controls the pressing unit to reset. Then, the unloading unit is started to control the eight support frames 2 to gradually separate. As the support frames 2 separate, under the action of the spring 11, the first support plate 12 and the second support plate 13 move in opposite directions. The first support plate 12 and the second support plate 13 will push the filter cloth 3, accelerating the detachment of the sludge filter cake between two adjacent filter cloths 3.

[0023] Example 2: Based on Example 1, referring to... Figure 4 , Figure 6 and Figure 7 As shown, it also includes sixteen sets of limiting units, which are disposed in adjacent chambers on adjacent support frames 2; each limiting unit includes four fixing plates 16, which are divided into two symmetrical groups, and all four fixing plates 16 are fixed to adjacent support frames 2. The fixing plates 16 are provided with inclined surfaces, and two adjacent fixing plates 16 are slidably provided with sliding frames 17. The sliding frames 17 are provided with sliding grooves, and four evenly distributed tension springs 18 are fixed between the sliding frames 17 and the adjacent support frames 2. The first support plate 12 and the second support plate 13 are respectively connected to the adjacent support frames 2. The adjacent sliding frame 17 slides in the groove, and the first support plate 12 and the second support plate 13 are rotatably connected. The two sets of fixed plates 16 are used to restrict the adjacent first support plate 12 and the adjacent second support plate 13 respectively. The elastic coefficient of the spring 11 is greater than that of the tension spring 18, which facilitates the movement of the first support plate 12 and the second support plate 13 through the inclined surface of the adjacent fixed plate 16. The elastic coefficient of the upper tension spring 18 is greater than that of the lower tension spring 18. As the sludge is injected, the first support plate 12 swings first, and the second support plate 13 swings later.

[0024] The working process of this embodiment follows that of Embodiment 1, and is described in detail as follows: During the process of sludge injection between the two filter cloths 3, the sludge accumulates in the middle of the two filter cloths 3. The accumulated sludge compresses and deforms the filter cloths 3. The deformation of the filter cloths 3 first compresses the upper part of the first support plate 12 and the lower part of the second support plate 13, causing them to swing into the chamber. Since the elastic coefficient of the upper tension spring 18 is greater than that of the lower tension spring 18, and the elastic coefficient of the spring 11 is greater than that of the tension spring 18, the first support plate 12 continues to swing, pulling the lower sliding frame 17 upward. The movement of the lower sliding frame 17 stretches the adjacent tension spring 18. During this process, the movement of the lower sliding frame 17 causes relative movement with the adjacent fixed plate 16. The fixed plate 16 gradually releases its restriction on the adjacent first support plate 12. After the lower fixed plate 16 releases its restriction on the first support plate 12, the lower part of the first support plate 12 retracts into the chamber. The first support plate 12 moves in a vertical state, allowing the sludge material to fill the lower part of the two filter cloths 3.

[0025] After the sludge material fills the lower part of the two filter cloths 3, the sludge continues to squeeze the two second support plates 13 and continue to swing. The swing of the second support plates 13 will drive the adjacent sliding frame 17 and the upper fixed plate 16 to move relative to each other until the upper part of the second support plates 13 also swings into the chamber, so that the sludge material fills the space between the two filter cloths 3. The above operation is repeated to separate the water in the sludge material. During this process, the degree of swing of the first support plate 12 and the second support plate 13 is controlled to ensure that the sludge material fills the gap between the two filter cloths 3 evenly, ensuring the amount of sludge processed by this device in a single operation, thereby indirectly improving the sludge treatment efficiency.

[0026] After the sludge is dewatered, the above-mentioned operation of separating the eight support frames 2 is repeated to detach the sludge filter cake. At the same time, under the elastic force of the spring 11, the first support plate 12 and the second support plate 13 are reset. Simultaneously, the first support plate 12 and the second support plate 13 press the inclined surface of the adjacent fixed plate 16, causing the first support plate 12 and the second support plate 13 to tilt and swing. During the tilting and swinging process, the first support plate 12 and the second support plate 13 pull the adjacent sliding frame 17 to move until the first support plate 12 and the second support plate 13 return to their initial state.

[0027] Example 3: Based on Example 2, referring to... Figure 4 , Figure 5 and Figure 8As shown, it also includes eight extrusion units, which are set on adjacent support frames 2. Each extrusion unit includes two reciprocating screws 19 symmetrically arranged front and rear. Both reciprocating screws 19 are rotatably arranged on adjacent support frames 2. Two drive motors 20 symmetrically arranged front and rear are fixed to the support frames 2. The output shafts of the drive motors 20 are fixedly connected to the upper ends of the adjacent reciprocating screws 19. The reciprocating screws 19 are threaded with sliding blocks 21. The support frames 2 are provided with two vertical slots. The sliding blocks 21 slide in the vertical slots on the adjacent support frames 2. The sliding blocks 21 are used to extrude adjacent first support plates 12 and adjacent second support plates 13. The support frames 2 are fixed with air guide pipes 22. The air guide pipes 22 are provided with evenly distributed jet nozzles. The jet nozzles on the air guide pipes 22 are located in the chambers of adjacent support frames 2. The air guide pipes 22 are used to guide gas to blow onto the adjacent first support plates 12 and adjacent second support plates 13.

[0028] The working process of this embodiment follows that of embodiment 2, and is described in detail as follows: After the sludge fills the space between the two filter cloths 3, the control system controls the two drive motors 20 to work. At the same time, an external air pump injects gas into the air pipe 22. The drive motors 20 work to make the adjacent reciprocating screws 19 rotate. The rotation of the reciprocating screws 19 drives the sliding block 21 to move from top to bottom. The sliding block 21 moves and squeezes the adjacent first support plate 12 and the adjacent second support plate 13, so that the first support plate 12 and the second support plate 13 further squeeze the filter cloth 3, accelerate the passage of water in the sludge material through the filter cloth 3, and ensure the uniformity of filter cake dewatering and the stability of sludge quality.

[0029] During the gas injection process into the air guide pipe 22, gas is ejected from the jet nozzle on the air guide pipe 22. The ejected gas flows from top to bottom in the cavity of the support frame 2. The flowing gas blows against the surface of the first support plate 12 and the surface of the second support plate 13, driving the water through the filter cloth 3 downward and accelerating the water out of the guide hole 5. At the same time, the gas injection increases the pressure in the cavity. The high pressure further squeezes the filter cloth 3 to shrink, accelerating the discharge of water from the sludge between the two filter cloths 3.

[0030] It should be noted that the above preferred embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A filter press device for sludge treatment, characterized in that, It includes a frame (1), on which a pressing unit, a unloading unit and a control system are provided. Multiple support frames (2) are slidably provided on the frame (1). Filter cloth (3) is fixedly connected to the support frame (2). Through holes (4) for material to pass through are provided in the middle of the filter cloth (3). Guide holes (5) are symmetrically distributed in the support frame (2). The support frame (2) is fixed with two symmetrically distributed first support plates (12) and two symmetrically distributed second support plates (13) by multiple springs (11). The two first support plates (12) are located on both sides of the support frame (2), and the two second support plates (13) are located on both sides of the support frame (2). Both the first support plates (12) and the second support plates (13) are used to squeeze the adjacent filter cloth (3).

2. The filter press device for sludge treatment according to claim 1, characterized in that, The through holes (4) on two adjacent filter cloths (3) are staggered, which makes it easier for the material in the through holes (4) to be squeezed so that the water inside can pass through the adjacent filter cloths (3).

3. The filter press device for sludge treatment according to claim 1, characterized in that, A fixing sleeve (6) is fixedly connected to the flow guide hole (5) on the support frame (2), and the fixing sleeve (6) is used to insert into the corresponding flow guide hole (5) on the adjacent support frame (2).

4. A filter press device for sludge treatment according to claim 1, characterized in that, The support frame (2) is fixed with a plurality of limiting posts (7), and the support frame (2) is provided with a plurality of limiting holes (8), which are used to limit the corresponding limiting posts (7).

5. A filter press device for sludge treatment according to claim 1, characterized in that, The filter cloth (3) is provided with protrusions (9), and the support frame (2) is provided with grooves (10). The protrusions (9) are used to squeeze the adjacent filter cloths (3) into the corresponding grooves (10).

6. A filter press device for sludge treatment according to claim 1, characterized in that, Both the first support plate (12) and the second support plate (13) are fixed with uniformly distributed protrusions (14), and the protrusions (14) are in contact with the adjacent filter cloth (3).

7. A filter press device for sludge treatment according to claim 1, characterized in that, Both the first support plate (12) and the second support plate (13) are provided with multiple guide grooves (15), which are used to guide water droplets to flow downward.

8. A filter press device for sludge treatment according to claim 1, characterized in that, It also includes multiple limiting units, the number of which is twice the number of the support frames (2), and the limiting units are disposed on adjacent support frames (2); The limiting unit includes multiple fixing plates (16), each of which is fixed to an adjacent support frame (2). Each fixing plate (16) has an inclined surface. The multiple fixing plates (16) are divided into two groups, each of which has a sliding frame (17) slidably connected to the adjacent support frame (2). A tension spring (18) is fixed between the sliding frame (17) and the adjacent support frame (2). The first support plate (12) and the second support plate (13) are slidably connected to the adjacent sliding frame (17), and the first support plate (12) and the second support plate (13) are rotatably connected. The two groups of fixing plates (16) are used to limit the adjacent first support plate (12) and the adjacent second support plate (13). The elastic coefficient of the spring (11) is greater than that of the tension spring (18).

9. A filter press device for sludge treatment according to claim 8, characterized in that, It also includes multiple extrusion units, the number of which is the same as the number of support frames (2), and the extrusion units are disposed on adjacent support frames (2); The extrusion unit includes multiple reciprocating screws (19), each of which is rotatably mounted on an adjacent support frame (2). The support frame (2) is fixedly connected to multiple drive motors (20), the number of which is the same as the number of reciprocating screws (19). The output shaft of each drive motor (20) is fixedly connected to an adjacent reciprocating screw (19). Each reciprocating screw (19) is threaded with a sliding block (21) that is slidably connected to an adjacent support frame (2). The sliding block (21) is used to extrude the adjacent first support plate (12) and the adjacent second support plate (13).

10. A filter press device for sludge treatment according to claim 9, characterized in that, The support frame (2) is fixedly connected to an air guide pipe (22), which is provided with uniformly distributed jet nozzles. The air guide pipe (22) is used to guide gas to blow against the adjacent first support plate (12) and the adjacent second support plate (13).

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