A filter press for mud water treatment and a filter pressing method thereof

Abstract

The present application relates to the field of filter press, in particular to a kind of filter press for mud water treatment with filter cake easy to remove and its filter pressing method, solve the problem that filter cake is dropped from filter plate by gravity after the filter cake is separated from two filter plates after filter press is used, part of filter cake may be attached to the diaphragm of filter plate, and filter cake is collected by single separation method of filter plate, which is not conducive to the collection of filter cake.A kind of filter press for mud water treatment with filter cake easy to remove and its filter pressing method, including filter press body, the inside of filter press body is slidably installed with filter cake block, multiple filter plates are slidably placed between one end of filter cake block and filter press body, the inside of filter plate is installed with diaphragm, the inside of one side of filter plate is fixed with three-way air valve.The strip-shaped air bag is inflated and protrudes from the surface of diaphragm body, the filter cake separation net embedded on the surface of diaphragm body is separated from diaphragm body, and filter cake is collected.

Description

Technical Field

[0001] This invention relates to the field of filter presses, specifically to a filter press for mud and water treatment that facilitates the removal of filter cake and its filtration method. Background Technology

[0002] A filter press is a mechanical device that uses a special filter medium to apply pressure to a material, causing the liquid to seep out. It is a commonly used solid-liquid separation device. A filter press consists of three core parts: a frame, a pressing mechanism, and a filtering mechanism. The filter press includes a pressure plate and a filter cake conveyor belt. The filtration assembly includes metal filter plates, diaphragms, and filter membranes. Filter presses are widely used in mud and water treatment processes. Mud and water are injected into the metal filter plates that are bonded together. After filtration by the metal filter plates, the mud and water are separated. The separated mud forms a filter cake between two adjacent aluminum plates. After filtration, the two adjacent metal filter plates separate from each other, and the filter cake separates from the two metal filter plates by gravity.

[0003] After the filter press is used, the filter cake falls off the filter press plates by gravity after the two filter plates separate. Some of the filter cake will still adhere to the diaphragm of the filter press plates. Moreover, the filter press plates are separated one by one to collect the filter cake, which is not conducive to the collection of the filter cake. Therefore, it does not meet the existing needs. In response, we propose a filter press and its filtration method for mud water treatment that facilitates the removal of filter cake. Summary of the Invention

[0004] The purpose of this invention is to provide a filter press for mud and water treatment and a filter pressing method that facilitates the removal of filter cake, in order to solve the problems mentioned in the background art, such as the filter cake falling off the filter press plates by gravity after the two filter plates are separated, with some of the filter cake still adhering to the diaphragm of the filter press plates, and the filter press plates using a single separation method to collect the filter cake, which is not conducive to the collection of filter cake.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a filter press for mud and water treatment that facilitates the removal of filter cake, comprising a filter press body, a filter block slidably installed on the inner side of the filter press body, a plurality of filter plates slidably placed between one end of the filter block and the filter press body, a diaphragm installed inside the filter plate, a three-way air valve fixed inside one side of the filter plate, a branch air pipe installed on the outer side of the filter plate and one end of the branch air pipe connected to the three-way air valve, a connecting air pipe fixed to the outer end of the branch air pipe, an air release valve and an air inlet valve fixed to the two ends of the connecting air pipe respectively, an air release pipe fixed to the other end of the air release valve, and an air inlet pipe fixed to the other end of the air inlet valve; The diaphragm includes a diaphragm body, the edges of which are bonded to the inner wall of the filter press plate. Multiple equally spaced strip-shaped air bladders are embedded on the front and rear surfaces of the diaphragm body. A filter cake separation screen is fixed between every two adjacent strip-shaped air bladders. A connecting air bladder is fixed between the tops of every two adjacent strip-shaped air bladders and the two air bladders are connected through the connecting air bladder. A diaphragm air supply pipe is fixed on one side of the diaphragm body and is connected to a three-way air valve. An inflation branch pipe is fixed on the outer side of the top of the strip-shaped air bladder near the three-way air valve, and one end of the inflation branch pipe is connected to the three-way air valve.

[0006] Preferably, filter plate sliding support blocks are detachably installed on the outer surfaces of both sides of the filter plate, and the filter plate slides inside the filter press body by relying on the filter plate sliding support blocks.

[0007] Preferably, a separation block is installed between every two adjacent filter press plates. The separation block includes a fixing block and a separation rod. The fixing block and the separation rod are respectively fixed to the surfaces of two adjacent filter press plates, and the separation rod is inserted into the fixing block.

[0008] Preferably, the end of the separating rod facing the fixing block has a circular hole, and a separating spring is fixed inside the circular hole, with one end of the separating spring fixed to the inner wall of the fixing block.

[0009] Preferably, tension ropes are installed around the separation rod, and both ends of the tension ropes are inserted through and inserted into U-shaped rods. The U-shaped rods at both ends of the tension ropes are fixed to the inner walls of the separation rod and the fixing block, respectively.

[0010] Preferably, a movable screw is fixed to one end of the filter block, and the other end of the movable screw passes through the filter press body and is fitted with an internally threaded sleeve on the outside of this end.

[0011] Preferably, the internally threaded sleeve is rotatably mounted at the end of the filter press body and is driven by the moving lead screw via a thread. A support plate is installed below the internally threaded sleeve and the support plate is fixed to the end of the filter press body.

[0012] Preferably, a transmission gear is fixed to one end of the internally threaded sleeve, and a drive gear is meshed and installed below the transmission gear.

[0013] Preferably, a movable motor is fixed to the upper surface of the support plate, and the output shaft of the movable motor passes through the drive gear and is fixed to the drive gear.

[0014] A filter press method for mud water treatment that facilitates filter cake removal includes the following steps: S1: After the slurry water pressure filtration is completed, first start the air inlet valve and close the air outlet valve. The gas enters the connecting air pipe through the air inlet pipe and the air inlet valve. The gas enters the branch air pipe from the connecting air pipe and continues to be transmitted. The gas enters the diaphragm air supply pipe and the diaphragm body through the three-way air valve. The diaphragm body expands and compresses the filter cake. S2: After the filter cake is squeezed by the expanded diaphragm body for a period of time, the air inlet valve is closed and the air outlet valve is opened. The gas in the diaphragm body is extracted through the separation block, connecting air pipe and branch air pipe, so that the diaphragm body shrinks and resets. S3: After the gas is completely extracted from the diaphragm body, the moving motor is powered on and starts in the forward direction. At the same time, the rotating plate at the bottom of the filter press rotates and opens. The moving motor drives the internal threaded sleeve to rotate through the drive gear and transmission gear. At this time, the internal threaded sleeve will move along the axis of the internal threaded sleeve through the threaded transmission between it and the moving screw. S4: After the moving screw moves, it will drive the filter block to move towards the end of the filter press body and away from the filter plate. After the filter block moves away from the filter plate, the separation spring and tension rope will elastically return to their original state. During the elastic return, the separation spring and tension rope will cause the fixed block to move away from the separation rod. At this time, each pair of adjacent filter plates will separate from each other. After the adjacent filter plates separate, the filter cake located between the two filter plates will fall out of the filter plate. S5: Next, start the air intake valve again and close the air release valve. The air intake pipe will deliver gas into the branch air pipe through the connecting air pipe. At this time, the gas in the branch air pipe will enter the inflation branch pipe through the three-way air valve. The gas in the inflation branch pipe will enter the strip air bag directly connected to the inflation branch pipe. At the same time, the gas will enter all the strip air bags through the connecting air bag between two adjacent strip air bags. S6: After gas is injected into the strip-shaped airbag, it will inflate and expand. The expanded strip-shaped airbag will separate the filter cake separation net embedded on the surface of the diaphragm body from the diaphragm body. At this time, the filter cake separation net will separate the filter cake attached to the diaphragm body from the diaphragm body, accelerate the falling of the filter cake, and better collect the filter cake.

[0015] 1. This invention involves supplying gas to the inflation branch pipe through a branch pipe and a three-way valve after two adjacent filter press plates separate and the gas inside the diaphragm body is discharged. The gas enters the strip-shaped air bladder through the inflation branch pipe and then enters all the strip-shaped air bladders through the connecting air bladders between adjacent strip-shaped air bladders. At this time, the strip-shaped air bladders inflate and protrude from the surface of the diaphragm body. The strip-shaped air bladders then separate the filter cake separation net embedded on the surface of the diaphragm body from the diaphragm body. The separated filter cake separation net will then separate the filter cake attached to the surface of the diaphragm body from the diaphragm body, accelerating the fall of the filter cake and improving the collection of the filter cake.

[0016] 2. This invention, by moving the filter block toward the end of the filter press body and away from the filter plates, allows the separation spring and tension rope to elastically return to their original state. At this time, the separation spring applies a pushing force to the fixed block, and the tension rope applies a pulling force to the end of the fixed block, causing the fixed block to move away from the separation rod. This automatically separates every two adjacent filter plates simultaneously, allowing the filter cake between every two adjacent filter plates to fall off at the same time. This shortens the total separation time of all filter plates on the filter press body and improves the collection efficiency of the filter cake. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal threaded sleeve of the present invention; Figure 3 This is a schematic diagram of the structure of the filter press plate of the present invention; Figure 4 This is a schematic diagram of the structure of the diaphragm of the present invention; Figure 5 This is a schematic diagram of the structure of the filter plate sliding support block of the present invention; Figure 6 This is a schematic diagram of the structure of the separation block of the present invention; Figure 7 This is a schematic diagram of the internal structure of the fixing block of the present invention.

[0018] In the diagram: 1. Filter press body; 2. Filter press block; 3. Moving screw; 4. Moving motor; 5. Filter press plate; 6. Separation block; 601. Fixing block; 602. Separation rod; 603. Tension rope; 604. Separation spring; 605. U-shaped rod; 7. Diaphragm; 701. Diaphragm body; 702. Strip-shaped air bladder; 703. Filter cake separation screen; 704. Connecting air bladder; 705. Inflating branch pipe; 706. Diaphragm air supply pipe; 8. Venting valve; 9. Venting pipe; 10. Inlet valve; 11. Inlet pipe; 12. Filter plate sliding support block; 13. Internal threaded sleeve; 14. Transmission gear; 15. Drive gear; 16. Connecting air pipe; 17. Three-way air valve; 18. Branch air pipe. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The mobile motor (model 130ST-M15025) mentioned in this invention can be obtained from the market or through private customization.

[0021] like Figure 1 and Figure 3As shown, a filter press for mud and water treatment that facilitates the removal of filter cake is disclosed. A filter block 2 is slidably installed on the inner side of the filter press body 1. Multiple filter plates 5 are slidably placed between one end of the filter block 2 and the filter press body 1. A diaphragm 7 is installed inside the filter plate 5. A three-way air valve 17 is fixed inside one side of the filter plate 5. A branch air pipe 18 is installed on the outer side of the filter plate 5, and one end of the branch air pipe 18 is connected to the three-way air valve 17. A connecting air pipe 16 is fixed to the outer end of the branch air pipe 18. An air release valve 8 and an air inlet valve 10 are fixed to the two ends of the connecting air pipe 16, respectively. An air release pipe 9 is fixed to the other end of the air release valve 8, and an air inlet pipe 11 is fixed to the other end of the air inlet valve 10.

[0022] like Figure 4 As shown, the diaphragm 7 includes a diaphragm body 701, the edges of which are bonded to the inner wall of the filter press plate 5. Multiple equally spaced strip-shaped air bladders 702 are embedded on both the front and rear surfaces of the diaphragm body 701. A filter cake separation screen 703 is fixed between every two adjacent strip-shaped air bladders 702. A connecting air bladder 704 is fixed between the top ends of every two adjacent strip-shaped air bladders 702, and the two air bladders are connected by the connecting air bladder 704. A diaphragm air supply pipe 706 is fixed to one side of the diaphragm body 701 and is connected to a three-way air valve 17. An inflation branch pipe 705 is fixed to the outer side of the top end of the strip-shaped air bladders 702 near the three-way air valve 17, and one end of the inflation branch pipe 705 is connected to the three-way air valve. 17 is connected, and gas is delivered to the inflation branch pipe 705 through the branch pipe 18 and the three-way valve 17. The gas enters the strip-shaped air bladder 702 through the inflation branch pipe 705. The gas will enter all the strip-shaped air bladders 702 through the connecting air bladder 704 between adjacent strip-shaped air bladders 702. At this time, the strip-shaped air bladder 702 will inflate and protrude from the surface of the diaphragm body 701. Then, the strip-shaped air bladder 702 will separate the filter cake separation net 703 embedded on the surface of the diaphragm body 701 from the diaphragm body 701. The separated filter cake separation net 703 will separate the filter cake attached to the surface of the diaphragm body 701 from the diaphragm body 701, accelerate the falling of the filter cake, and better collect the filter cake.

[0023] like Figure 1 , Figures 5 to 7 As shown, filter plate sliding support blocks 12 are detachably installed on the outer surfaces of both sides of the filter plate 5, and the filter plate 5 slides inside the filter press body 1 by relying on the filter plate sliding support blocks 12.

[0024] A separation block 6 is installed between every two adjacent filter press plates 5. The separation block 6 includes a fixing block 601 and a separation rod 602. The fixing block 601 and the separation rod 602 are respectively fixed to the surfaces of the two adjacent filter press plates 5. The separation rod 602 is inserted into the fixing block 601. The end of the separation rod 602 facing the fixing block 601 has a round hole. A separation spring 604 is fixed inside the round hole. One end of the separation spring 604 is fixed to the inner wall of the fixing block 601. Tension ropes 603 are installed around the separation rod 602. Both ends of the tension ropes 603 are inserted through and inserted into the U-shaped rod 605. The U-shaped rods 605 at both ends of the tension rope 603 are fixed to the inner walls of the separating rod 602 and the fixing block 601, respectively. After the filter block 2 moves toward the end of the filter press body 1 and away from the filter plate 5, the separating spring 604 and the tension rope 603 elastically return to their original state. At this time, the separating spring 604 will apply a pushing force to the fixing block 601, and the tension rope 603 will apply a pulling force to the end of the fixing block 601, so that the fixing block 601 moves away from the separating rod 602, automatically separating each pair of adjacent filter plates 5 at the same time, so that the filter cake between each pair of adjacent filter plates 5 falls off at the same time.

[0025] like Figure 1 and Figure 2 As shown, a movable screw 3 is fixed to one end of the filter press block 2. The other end of the movable screw 3 passes through the filter press body 1, and an internally threaded sleeve 13 is fitted on the outside of this end. The internally threaded sleeve 13 is rotatably installed at the end of the filter press body 1 and is driven by the movable screw 3 through a thread. A support plate is installed below the internally threaded sleeve 13 and is fixed to the end of the filter press body 1. A transmission gear 14 is fixed to one end of the internally threaded sleeve 13. A drive gear 15 is meshed below the transmission gear 14. A movable motor 4 is fixed to the upper surface of the support plate. The output shaft of the movable motor 4 passes through the drive gear 15 and is fixed to the drive gear 15. The movable motor 4 drives the drive gear 15 and the transmission gear 14 to rotate, so that the internally threaded sleeve 13 drives the movable screw 3 to move along its axial direction through the thread, thereby changing the position of the filter press block 2.

[0026] Working principle: After the slurry is filtered, the slurry supply is stopped. Then, the air inlet valve 10 is opened and the air outlet valve 8 is closed. Gas enters the connecting air pipe 16 and the branch air pipe 18 through the air inlet pipe 11. After entering the branch air pipe 18, the gas enters the diaphragm body 701 through the three-way air valve 17 and the diaphragm air supply pipe 706, causing the diaphragm body 701 to expand. After expansion, the diaphragm body 701 cooperates with the adjacent diaphragm bodies 701 to squeeze the filter cake again, squeezing out excess water from the filter cake. Then, the air inlet valve 10 is closed and the air outlet valve 8 is opened. The gas located in the diaphragm body 701 is extracted through the connecting air pipe 16 and the branch air pipe 18, allowing the diaphragm body 701 to return to its original shape. Next, the moving motor 4 is connected to the power supply and starts in the forward direction. At the same time, the rotating part at the bottom of the filter press body 1... When the plate rotates and opens, the moving motor 4 drives the internal threaded sleeve 13 to rotate through the drive gear 15 and the transmission gear 14. At this time, the internal threaded sleeve 13 will move along the axis of the moving screw 3 through the threaded transmission between the internal threaded sleeve 13 and the moving screw 3. After the moving screw 3 moves, it will drive the filter block 2 to move towards the end of the filter press body 1 and away from the filter plate 5. After the filter block 2 moves away from the filter plate 5, the separation spring 604 and the tension rope 603 will elastically recover. During the elastic recovery, the separation spring 604 and the tension rope 603 will cause the fixed block 601 to move away from the separation rod 602. At this time, each pair of adjacent filter plates 5 will separate from each other. After the adjacent filter plates 5 separate, the filter cake located between the two filter plates 5 will fall from the filter plate 5. When the filter cake falls between the filter plates 5, the air inlet valve 10 is opened and the air outlet valve 8 is closed. At this time, the gas will enter the inflation branch pipe 705 through the air inlet pipe 11, the connecting air pipe 16, the branch air pipe 18, and the three-way air valve 17. The gas entering the inflation branch pipe 705 will enter the strip-shaped air bladder 702 directly connected to the inflation branch pipe 705. At the same time, the gas will enter all the strip-shaped air bladders 702 through the connecting air bladder 704 between two adjacent strip-shaped air bladders 702. After the gas is injected, the strip-shaped air bladders 702 will inflate and expand. The expanded strip-shaped air bladders 702 will separate the filter cake separation net 703 embedded on the surface of the diaphragm body 701 from the diaphragm body 701. At this time, the filter cake separation net 703 will separate the filter cake attached to the diaphragm body 701 from the diaphragm body 701, accelerate the falling of the filter cake, and better collect the filter cake.

[0027] A filter press method for mud water treatment that facilitates filter cake removal includes the following steps: S1: After the slurry water pressure filtration is completed, first start the air inlet valve 10 and close the air outlet valve 8. Then the gas enters the connecting air pipe 16 through the air inlet pipe 11 and the air inlet valve 10. The gas enters the branch air pipe 18 from the connecting air pipe 16 and continues to be transmitted. The gas enters the diaphragm air supply pipe 706 and the diaphragm body 701 through the three-way air valve 17. The diaphragm body 701 expands to compress the filter cake. S2: After the filter cake is squeezed by the expanded diaphragm body 701 for a period of time, the inlet valve 10 is closed and the outlet valve 8 is started. The gas in the diaphragm body 701 is extracted through the separator 6, the connecting air pipe 16 and the branch air pipe 18, so that the diaphragm body 701 contracts and resets. S3: After the gas is completely extracted from the diaphragm body 701, the moving motor 4 is powered on and starts in the forward direction. At the same time, the rotating plate at the bottom of the filter press body 1 rotates and opens. The moving motor 4 drives the internal threaded sleeve 13 to rotate through the drive gear 15 and the transmission gear 14. At this time, the internal threaded sleeve 13 will move along the axial direction of the internal threaded sleeve 13 through the threaded transmission between it and the moving screw 3. S4: After the moving screw 3 moves, it will drive the filter block 2 to move towards the end of the filter press body 1 and away from the filter plate 5. After the filter block 2 moves away from the filter plate 5, the separation spring 604 and the tension rope 603 will elastically recover. During the elastic recovery, the separation spring 604 and the tension rope 603 will cause the fixed block 601 to move away from the separation rod 602. At this time, each pair of adjacent filter plates 5 will separate from each other. After the adjacent filter plates 5 separate, the filter cake located between the two filter plates 5 will fall from the filter plate 5. S5: Next, start the air intake valve 10 again and close the air release valve 8. The air intake pipe 11 delivers gas into the branch pipe 18 through the connecting pipe 16. At this time, the gas entering the branch pipe 18 enters the inflation branch pipe 705 through the three-way valve 17. The gas entering the inflation branch pipe 705 will enter the strip air bag 702 directly connected to the inflation branch pipe 705. At the same time, the gas will enter all the strip air bags 702 through the connecting air bag 704 between two adjacent strip air bags 702. S6: After gas is injected into the strip-shaped airbag 702, it will inflate and expand. The expanded strip-shaped airbag 702 will separate the filter cake separation net 703 embedded on the surface of the diaphragm body 701 from the diaphragm body 701. At this time, the filter cake separation net 703 will separate the filter cake attached to the diaphragm body 701 from the diaphragm body 701, accelerate the falling of the filter cake, and better collect the filter cake.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A filter press for mud and water treatment that facilitates the removal of filter cake, comprising a filter press body (1), a filter block (2) slidably mounted on the inner side of the filter press body (1), and a plurality of filter plates (5) slidably placed between one end of the filter block (2) and the filter press body (1), characterized in that: A separation block (6) is installed between each pair of adjacent filter plates (5). The separation block (6) includes a fixing block (601) and a separation rod (602). The fixing block (601) and the separation rod (602) are respectively fixed to the surfaces of two adjacent filter plates (5). The separation rod (602) is inserted into the inside of the fixing block (601). The end of the separation rod (602) facing the fixing block (601) is provided with a round hole. A separation spring (604) is fixed inside the round hole. One end of the separation spring (604) is fixed to the inner wall of the fixing block (601). Tension ropes (603) are installed around the separation rod (602). 3) Both ends of the cable are inserted through and connected to the U-shaped rod (605). The U-shaped rods (605) at both ends of the tension rope (603) are fixed to the inner wall of the separating rod (602) and the fixing block (601), respectively. After the filter block (2) moves to the end of the filter press body (1) and away from the filter plate (5), the separating spring (604) and the tension rope (603) elastically recover. The separating spring (604) applies a pushing force to the fixing block (601), and the tension rope (603) applies a pulling force to the end of the fixing block (601), so that the fixing block (601) moves away from the separating rod (602), thereby automatically separating every two adjacent filter plates at the same time. The filter press plate (5) is equipped with a diaphragm (7) inside. A three-way air valve (17) is fixed inside one side of the filter press plate (5). A branch air pipe (18) is installed on the outside of the filter press plate (5) and one end of the branch air pipe (18) is connected to the three-way air valve (17). A connecting air pipe (16) is fixed at the outer end of the branch air pipe (18). A vent valve (8) and an inlet valve (10) are fixed at both ends of the connecting air pipe (16). A vent pipe (9) is fixed at the other end of the vent valve (8). An inlet pipe (11) is fixed at the other end of the inlet valve (10). The diaphragm (7) includes a diaphragm body (701), the edge of which is bonded to the inner wall of the filter press (5). Multiple equally spaced strip-shaped air bags (702) are embedded on the front and rear surfaces of the diaphragm body (701). A filter cake separation net (703) is fixed between each two adjacent strip-shaped air bags (702). A connecting air bag (704) is fixed between the tops of each two adjacent strip-shaped air bags (702) and they are connected through the connecting air bag (704). A diaphragm air supply pipe (706) is fixed on one side of the diaphragm body (701) and is connected to a three-way air valve (17). An inflation branch pipe (705) is fixed on the outer side of the top of the strip-shaped air bag (702) near the three-way air valve (17). One end of the inflation branch pipe (705) is connected to the three-way air valve (17).

2. A filter press for sludge water treatment that facilitates filter cake removal according to claim 1, characterized in that: The filter plate (5) has a filter plate sliding support block (12) that can be detachably installed on both outer surfaces. The filter plate (5) slides inside the filter press body (1) by relying on the filter plate sliding support block (12).

3. A filter press for sludge water treatment that facilitates filter cake removal according to claim 1, characterized in that: One end of the filter block (2) is fixed with a movable screw (3), and the other end of the movable screw (3) passes through the filter press body (1) and is fitted with an internal threaded sleeve (13) on the outside of this end.

4. A filter press for sludge water treatment that facilitates filter cake removal according to claim 3, characterized in that: The internal threaded sleeve (13) is rotatably installed at the end of the filter press body (1) and is driven by the moving screw (3) through a thread. A support plate is installed below the internal threaded sleeve (13) and the support plate is fixed at the end of the filter press body (1).

5. A filter press for sludge water treatment that facilitates filter cake removal according to claim 4, characterized in that: One end of the internal threaded sleeve (13) is fixed with a transmission gear (14), and a drive gear (15) is meshed below the transmission gear (14).

6. A filter press for sludge water treatment with easy cake removal according to claim 5, characterized in that: A movable motor (4) is fixed on the upper surface of the support plate. The output shaft of the movable motor (4) passes through the drive gear (15) and is fixed to the drive gear (15).

7. A filtration method for a filter press for sludge water treatment, based on a filter press as described in claim 6, characterized in that: The pressure filtration method includes the following steps: S1: After the slurry water pressure filtration is completed, first start the air inlet valve (10) and close the air outlet valve (8). At this time, the gas enters the connecting air pipe (16) through the air inlet pipe (11) and the air inlet valve (10). The gas enters the branch air pipe (18) from the connecting air pipe (16) and continues to be transmitted. The gas enters the diaphragm air supply pipe (706) and the diaphragm body (701) through the three-way air valve (17). The diaphragm body (701) expands to compress the filter cake. S2: After the filter cake is squeezed by the expanded diaphragm body (701) for a period of time, the air inlet valve (10) is closed and the air outlet valve (8) is started. The gas in the diaphragm body (701) is extracted through the separator (6), the connecting air pipe (16) and the branch air pipe (18), so that the diaphragm body (701) shrinks and resets. S3: After the gas is completely extracted from the diaphragm body (701), the moving motor (4) is powered on and starts in the forward direction. At the same time, the rotating plate at the bottom of the filter press body (1) rotates and opens. The moving motor (4) drives the internal threaded sleeve (13) to rotate through the drive gear (15) and the transmission gear (14). At this time, the internal threaded sleeve (13) will move along the axis of the internal threaded sleeve (13) through the thread transmission between it and the moving screw (3). S4: After the moving screw (3) moves, it will drive the filter block (2) to move towards the end of the filter press body (1) and away from the filter plate (5). After the filter block (2) moves away from the filter plate (5), the separation spring (604) and the tension rope (603) will elastically recover. During the elastic recovery, the separation spring (604) and the tension rope (603) will cause the fixed block (601) to move away from the separation rod (602). At this time, each pair of adjacent filter plates (5) will separate from each other. After the adjacent filter plates (5) separate, the filter cake located between the two filter plates (5) will fall from the filter plate (5). S5: Next, start the air intake valve (10) again and close the air release valve (8). The air intake pipe (11) delivers gas into the branch pipe (18) through the connecting pipe (16). At this time, the gas in the branch pipe (18) enters the inflation branch pipe (705) through the three-way valve (17). The gas entering the inflation branch pipe (705) will enter the strip air bag (702) directly connected to the inflation branch pipe (705). At the same time, the gas will enter all the strip air bags (702) through the connecting air bag (704) between two adjacent strip air bags (702). S6: After gas is injected into the strip-shaped airbag (702), it will inflate and expand. The expanded strip-shaped airbag (702) will separate the filter cake separation net (703) embedded on the surface of the diaphragm body (701) from the diaphragm body (701). At this time, the filter cake separation net (703) will separate the filter cake attached to the diaphragm body (701) from the diaphragm body (701), accelerate the falling of the filter cake, and better collect the filter cake.

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