Sludge slurry filter press

Abstract

The invention discloses a sludge and slurry filter press, which relates to the technical field of sludge treatment and comprises a base and a filter plate, the base comprises a supporting rod, a movable pressing plate and a fixed pressing plate. The filter plate is in sliding connection with the supporting rod, and the filter plate comprises filter cloth, an elastic plate and a slurry conveying pipe; the filter cloth is fixedly connected to the middle part of the filter plate; the elastic plates are fixedly connected to the middle parts of the filter plates, the elastic plates are arranged between the two pieces of filter cloth, the number of the elastic plates is two, an inner cavity is formed between the elastic plates, a drainage chamber is formed between the elastic plates and the filter cloth, and a slurry chamber is formed on the outer side of the filter cloth; the slurry conveying pipe penetrates through the middle part of the filter plate and is used for conveying slurry; a liquid bag is arranged in the inner cavity, the top of the filter plate is fixedly connected with a water pump, and the liquid bag is communicated with the water pump; a drainage hole is formed in the bottom of the drainage chamber; a good dehydration effect can be achieved under the condition of various mud feeding amounts, and mud cakes can smoothly fall off.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment, in particular to a sludge slurry filter press. Background Art

[0002] The filter press is a machine used for sludge dehydration. It is composed of plates and frames arranged alternately, with filter cloths on both sides of the filter plates. The plates and frames are pressed together by a pressing device, forming a filter press chamber between the plates and frames. The surface of the filter plates is engraved with grooves, and the lower end is drilled with channels for the discharge of filtrate. Under pressure, the filtrate is discharged from the filter machine through the filter cloth along the grooves and channels to dehydrate the sludge.

[0003] The Chinese invention patent with patent number CN115367984B discloses a filter press device for sludge treatment. Through the setting of connecting springs, cavities and nozzles, after the filter press work is completed, the hydraulic cylinder retracts. At this time, the movable pressure plate will automatically separate from each filter plate by a certain interval under the rebound action of the connecting spring, which is convenient for the mud cake to fall off. At the same time, the supporting spring will automatically open under its own rebound action, thereby pushing the nozzle out to both sides to push the mud cake, and clean water can be pumped in through the liquid inlet pipe. When the water pressure is less than the threshold value of the one-way pressure valve, the nozzles on both sides are further pushed out to ensure that the mud cake can fall off automatically.

[0004] However, during the actual use of the above scheme, if the sludge slurry feed amount is small and the compression degree of the supporting spring is small, the sludge dehydration effect will be poor. At the same time, the restoring force of the spring may be insufficient, resulting in the mud cake being unable to fall off smoothly and remaining on the filter plate, affecting the subsequent processing efficiency. In addition, long-term and frequent expansion and contraction of the spring may also cause fatigue damage, affecting its rebound performance and service life, and further affecting the stability and reliability of the filter press device. Summary of the invention

[0005] The present application provides a sludge filter press to solve the problem in the prior art that when the sludge feed amount is small, the sludge dehydration effect is poor, the mud cake cannot fall off smoothly, and the subsequent processing efficiency is affected. The application achieves good dehydration effect and smooth falling of the mud cake under various mud feed amounts.

[0006] The present application provides a sludge filter press, comprising a base and a filter plate; The base comprises a support rod, a movable pressure plate and a fixed pressure plate; There are two support rods, which are fixedly connected to the top of the base and arranged horizontally; The fixed pressure plate is fixedly connected to one end of the support rod; The movable pressing plate is slidably connected to the support rod, and the movable pressing plate is connected to the base via a hydraulic telescopic rod; The filter plate is slidably connected to the support rod, the filter plate is arranged between the movable pressure plate and the fixed pressure plate, and the filter plate includes a filter cloth, an elastic plate and a slurry conveying pipe; The filter cloth is fixedly connected to the middle of the filter plate, and two filter cloths are provided. The filter cloths are used to filter out insoluble particles in the mud; The elastic plate is fixedly connected to the middle of the filter plate, the elastic plate is arranged between two filter cloths, two elastic plates are provided, an inner cavity is formed between the elastic plates, a drainage chamber is formed between the elastic plate and the filter cloth, and a mud chamber is formed outside the filter cloth; The slurry delivery pipe runs through the middle of the filter plate, and the slurry delivery pipe is used for slurry delivery; A liquid capsule is provided in the inner cavity, a water pump is fixedly connected to the top of the filter plate, and the liquid capsule is in communication with the water pump; A drainage hole is provided at the bottom of the drainage chamber, and the drainage hole is used for discharging filtrate.

[0007] Furthermore, the elastic plate further comprises an inner half membrane and an outer half membrane, the inner half membrane is fixedly connected to one side of the elastic plate, the inner half membrane is arranged in the inner cavity, the inner half membrane is fixedly connected to the liquid capsule, and the inner half membrane is made of a flexible material; The outer half membrane is fixedly connected to the other side of the elastic plate, the outer half membrane is arranged in the drainage chamber, the positions of the two ends of the outer half membrane are the same as the two ends of the inner half membrane, and the outer half membrane is made of flexible material.

[0008] Furthermore, the inner half membranes are provided in plurality, and the number of the outer half membranes is the same as that of the inner half membranes.

[0009] Furthermore, the elastic plate is also provided with a through hole, and the through hole is only provided in the portion of the elastic plate between the inner half membrane and the outer half membrane, and the space between the inner half membrane and the outer half membrane is filled with liquid, and the through hole is used for the liquid to pass through.

[0010] Furthermore, the liquid capsule also includes an upper capsule and a lower capsule, the upper capsule is connected to the water pump, the lower capsule is arranged at the bottom of the upper capsule, and a plurality of the lower capsules are provided.

[0011] Furthermore, the liquid capsule also includes a valve, and a plurality of the valves are provided. The valves are arranged between the upper capsule and the lower capsule and between adjacent lower capsules, and the valves are used to control the water channel switch.

[0012] Furthermore, the elastic plate also includes a telescopic portion, the telescopic portion is fixedly connected to one side of the elastic plate, the telescopic portion is arranged in the drainage chamber, and the telescopic portion is arranged between a plurality of outer half membranes.

[0013] Furthermore, the telescopic part is used to telescopically support or lower the filter cloth. When the telescopic part is contracted, the thickness relative to the elastic plate is half of the normal thickness of the outer half membrane. When the telescopic part is extended, the thickness relative to the elastic plate is twice the thickness of the outer half membrane when it is fully expanded.

[0014] Furthermore, the telescopic part also includes an electromagnet and a permanent magnet. The electromagnet is fixedly connected to the inside of the elastic plate. The electromagnet and the middle of the telescopic part are at the same height. The permanent magnet is arranged inside the telescopic part, and the magnetic pole of the permanent magnet points to the electromagnet.

[0015] Furthermore, the magnetic pole of the electromagnet points to the permanent magnet, and the electromagnet is used to receive different electrical signals and change the strength and direction of the magnetic field.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages: Firstly, by arranging a liquid bag in the inner cavity of the elastic plate, the amount of liquid in the liquid bag is increased and the elastic plate is squeezed toward the filter cloth, the sludge is squeezed and dehydrated and the mud cake falls off. This effectively solves the problem that the prior art relies on spring elasticity, and when the sludge feed amount is small, the sludge dehydration effect is poor, the mud cake cannot fall off smoothly, and the subsequent processing efficiency is affected. This achieves a better dehydration effect under various mud feed amounts and the mud cake can fall off smoothly.

[0017] Secondly, a connected inner half membrane and outer half membrane are provided on the surface of the elastic plate. The inner half membrane is squeezed by the liquid bag, and the outer half membrane swells to squeeze the filter cloth, thereby generating greater pressure on the filter cloth. In addition, by setting up multiple groups of inner half membranes and outer half membranes, the pressure difference at different places of the filter cloth is reduced, thereby achieving a better dehydration effect.

[0018] Thirdly, by dividing the liquid capsule into an upper capsule and multiple lower capsules, and connecting them through valves, when the liquid is injected, the mud cake can be squeezed layer by layer from top to bottom, so that the water in the mud cake gathers at the bottom and is discharged together. In addition, the water channels of each layer of capsules can be disconnected so that the liquid pressure of each layer is the same, avoiding uneven squeezing force on the mud cake, which limits the dehydration effect of the mud cake.

[0019] Fourthly, by adding a telescopic part between the outer half membranes, after the outer half membrane squeezes the filter cloth, the telescopic part extends out to support the filter cloth and divide the drainage chamber into multiple layers. Then the liquid bag contracts and pulls back the outer half membrane, and the filter cloth is restricted by the telescopic part, and negative pressure is generated between the outer half membrane and the filter cloth, thereby performing secondary pumping of water to the mud cake. At the same time, the liquid bag has a multi-layer structure, and water in the mud cake can be extracted from top to bottom in sequence. The multi-layer drainage chambers separated by the telescopic part cannot be completely separated, and then when extracting the corresponding water of the lower layer, the extracted water accumulated in the upper layer can be pumped into the lower layer, and finally gathered to the drainage hole for discharge, thereby realizing secondary pumping of water to the mud cake and enhancing the dehydration effect of the mud cake.

[0020] Fifthly, the telescopic part is driven by the magnetic force between the electromagnet and the permanent magnet, and then after the mud cake is filtered, the magnetic pole of the electromagnet is changed intermittently, so that the telescopic part continuously strikes the filter cloth, and then under the action of inertia, the mud cake is completely removed from the filter cloth, thereby improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a sludge filter press of the present invention; Figure 2 A cross-sectional view of a filter plate of a sludge filter press according to the present invention Figure 1 ; Figure 3 A cross-sectional view of a filter plate of a sludge filter press according to the present invention Figure 2 ; Figure 4 A cross-sectional view of an elastic plate of a sludge filter press in a non-working state according to the present invention Figure 1 ; Figure 5 A cross-sectional view of an elastic plate of a sludge filter press during the sludge extrusion working stage of the present invention Figure 1 ; Figure 6 A cross-sectional view of an elastic plate of a sludge filter press during the liquid capsule extrusion working stage of the present invention Figure 1 ; Figure 7 A cross-sectional view of a filter plate of a sludge filter press according to the present invention Figure 3 ; Figure 8 A cross-sectional view of a liquid capsule of a sludge filter press according to the present invention; Fig. 9 A cross-sectional view of an elastic plate of a sludge filter press in a non-working state according to the present invention Figure 2 ; Fig.10 A cross-sectional view of an elastic plate of a sludge filter press during the liquid capsule extrusion working stage of the present invention Figure 2 ; Fig.11 It is a cross-sectional view of an elastic plate of a telescopic part of a sludge filter press of the present invention in a working stage of lifting up the filter cloth; Fig.12 It is a cross-sectional view of an elastic plate of a sludge filter press in the secondary pumping working stage of the present invention; Fig.13 A cross-sectional view of the telescopic part of a sludge filter press according to the present invention Figure 1 ; Fig.14 A cross-sectional view of the telescopic part of a sludge filter press according to the present invention Figure 2 .

[0022] In the figure: 100, base; 110, support rod; 120, movable pressure plate; 130, fixed pressure plate; 200, filter plate; 210, filter cloth; 220, elastic plate; 221, inner half membrane; 222, outer half membrane; 223, through hole; 224, telescopic part; 2241, electromagnet; 2242, permanent magnet; 230, slurry pipe; 240, inner cavity; 250, drainage chamber; 260, mud chamber; 270, liquid capsule; 271, upper capsule; 272, lower capsule; 273, valve; 280, water pump; 290, drainage hole. DETAILED DESCRIPTION

[0023] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0024] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] Embodiment 1: Figure 1-Figure 2 As shown, the present application provides a sludge filter press including a base 100 and a filter plate 200; The base 100 includes a support rod 110, a movable pressure plate 120 and a fixed pressure plate 130; There are two support rods 110, and the support rods 110 are fixedly connected to the top of the base 100, and the support rods 110 are arranged horizontally; The fixed pressure plate 130 is fixedly connected to one end of the support rod 110; The movable pressing plate 120 is slidably connected to the support rod 110, and the movable pressing plate 120 is connected to the base 100 via a hydraulic telescopic rod; The filter plate 200 is slidably connected to the support rod 110, and the filter plate 200 is disposed between the movable pressure plate 120 and the fixed pressure plate 130. The filter plate 200 includes a filter cloth 210, an elastic plate 220, and a slurry conveying pipe 230. The filter cloth 210 is fixedly connected to the middle of the filter plate 200. Two filter cloths 210 are provided. The filter cloths 210 are used to filter out insoluble particles in the mud. The elastic plate 220 is fixedly connected to the middle of the filter plate 200, and the elastic plate 220 is arranged between two filter cloths 210. There are two elastic plates 220, and an inner cavity 240 is formed between the elastic plates 220, a drainage chamber 250 is formed between the elastic plate 220 and the filter cloth 210, and a mud chamber 260 is formed outside the filter cloth 210; The slurry delivery pipe 230 passes through the middle of the filter plate 200, and the slurry delivery pipe 230 is used for slurry delivery; A liquid capsule 270 is disposed in the inner cavity 240 , a water pump 280 is fixedly connected to the top of the filter plate 200 , and the liquid capsule 270 is in communication with the water pump 280 ; A drainage hole 290 is provided at the bottom of the drainage chamber 250, and the drainage hole 290 is used for discharging filtrate.

[0027] When a sludge filter press according to an embodiment of the present application is actually operated, the steps are as follows: The movable pressure plate 120 presses all the filter plates 200 toward the fixed pressure plate 130, and a mud chamber 260 is formed between the filter plates. The mud enters the mud chamber 260 through the slurry pipe 230, and the water in the mud enters the drainage chamber 250 through the filter cloth 210, enters the drainage hole 290 under gravity and is then discharged. The mud squeezes the filter cloth 210 and then squeezes the elastic plate 220 to deform inward. After the mud input is completed, the liquid capsule 270 is pressurized by the water pump 280, and the liquid capsule 270 squeezes the elastic plate 220. The elastic plate 220 is compressed and deformed to squeeze the mud. The water inside the mud is squeezed and further discharged through the filter cloth 210 to form a mud cake. After the filtration is completed, the elastic plate 220 is squeezed by the liquid capsule 270, and the elastic plate 220 applies a lateral force to the mud cake to make it fall off.

[0028] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: By setting a liquid bag 270 in the inner cavity 240 of the elastic plate 220, the liquid volume in the liquid bag 270 is increased and the elastic plate 220 is squeezed toward the filter cloth 210, so as to achieve the extrusion dehydration of the mud and the falling off of the mud cake. This effectively solves the problem that the prior art relies on spring elasticity, and when the sludge feed amount is small, the sludge dehydration effect is poor, the mud cake cannot be smoothly fallen off, and the subsequent processing efficiency is affected. It is achieved that under various mud feed amounts, a better dehydration effect is achieved and the mud cake can be smoothly fallen off.

[0029] Embodiment 2: When the elastic plate 220 in the above embodiment is deformed under pressure, its deformation degree is limited, and the deformation in the middle is larger while the deformation at both ends is smaller, resulting in limited dehydration effect of the mud cake; the embodiment of the present application is optimized to a certain extent on the basis of the above embodiment.

[0030] like Figure 3-Figure 6 As shown, the elastic plate 220 further includes an inner half membrane 221 and an outer half membrane 222, the inner half membrane 221 is fixedly connected to one side of the elastic plate 220, the inner half membrane 221 is disposed in the inner cavity 240, the inner half membrane 221 is fixedly connected to the liquid capsule 270, and the inner half membrane 221 is made of a flexible material; The outer half membrane 222 is fixedly connected to the other side of the elastic plate 220 . The outer half membrane 222 is arranged in the drainage chamber 250 . The positions of the two ends of the outer half membrane 222 and the two ends of the inner half membrane 221 are the same. The outer half membrane 222 is made of flexible material.

[0031] Furthermore, the inner half membrane 221 is provided in plurality, and the number of the outer half membrane 222 is the same as that of the inner half membrane 221 .

[0032] Furthermore, the elastic plate 220 is also provided with a through hole 223, which is only provided in the portion of the elastic plate 220 between the inner half membrane 221 and the outer half membrane 222. The inner half membrane 221 and the outer half membrane 222 are filled with liquid, and the through hole 223 is used for the liquid to pass through.

[0033] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: The surface of the elastic plate 220 is provided with an inner half membrane 221 and an outer half membrane 222 which are connected. The inner half membrane 221 is squeezed by the liquid bag 270, and the outer half membrane 222 swells and squeezes the filter cloth 210, thereby generating greater pressure on the filter cloth 210. In addition, by providing multiple groups of inner half membranes 221 and outer half membranes 222, the pressure difference at different parts of the filter cloth 210 is reduced, thereby achieving a better dehydration effect.

[0034] Embodiment 3: The pressure of the liquid capsule 270 on the inner half membrane 221 in the above embodiment comes from the liquid pressure. The filtration effect of liquid is better than that of gas, and it can perform more stringent filtration under different conditions. The liquid pressure increases with the increase of depth, resulting in that the pressure of the side wall of the liquid capsule 270 on the inner half membrane 221 is not uniform. Moreover, considering that when liquid is injected into the liquid capsule 270, the liquid will first gather at the bottom of the liquid capsule 270, resulting in the bottom of the mud cake being squeezed first, and the squeezing force at the bottom is always greater than that at the top, so that the water in the mud cake accumulates at the top of the mud cake, restricting the dehydration effect. The embodiment of the present application is optimized on the basis of the above embodiment.

[0035] like Figure 7-Figure 8As shown, the liquid capsule 270 further includes an upper capsule 271 and a lower capsule 272 . The upper capsule 271 is connected to the water pump 280 . The lower capsule 272 is disposed at the bottom of the upper capsule 271 . A plurality of lower capsules 272 are provided.

[0036] Furthermore, the liquid capsule 270 further includes a valve 273 , and a plurality of valves 273 are provided. The valves 273 are arranged between the upper capsule 271 and the lower capsule 272 and between adjacent lower capsules 272 . The valves 273 are used to control the water circuit switch.

[0037] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: By dividing the liquid capsule 270 into an upper capsule 271 and multiple lower capsules 272, and connecting them through valves 273, when liquid is injected, the mud cake can be squeezed layer by layer from top to bottom, so that the water in the mud cake gathers at the bottom and is discharged together. In addition, the water channels of each layer of capsules can be disconnected so that the liquid pressure of each layer is the same, avoiding uneven squeezing force on the mud cake, which will limit the dehydration effect of the mud cake.

[0038] Embodiment 4: After the elastic plate 220 in the above embodiment squeezes and dehydrates the mud cake, water will still exist in the gap between the outer half membranes 222, resulting in part of the water being absorbed back into the mud cake when the elastic plate 220 withdraws the pressure and no longer squeezes the mud cake; the embodiment of the present application is optimized based on the above embodiment.

[0039] like Figure 9-12 As shown, the elastic plate 220 further includes a telescopic portion 224 , which is fixedly connected to one side of the elastic plate 220 , is disposed in the drainage chamber 250 , and is disposed between a plurality of outer half membranes 222 .

[0040] Furthermore, the telescopic portion 224 is used to telescopically support or lower the filter cloth 210. When the telescopic portion 224 is contracted, the thickness relative to the elastic plate 220 is half of the normal thickness of the outer half membrane 222. When the telescopic portion 224 is extended, the thickness relative to the elastic plate 220 is twice the thickness of the outer half membrane 222 when it is fully expanded.

[0041] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: By adding a telescopic portion 224 between the outer half membrane 222, after the outer half membrane 222 squeezes the filter cloth 210, the telescopic portion 224 extends out to support the filter cloth 210, and the drainage chamber 250 is divided into multiple layers. Then the liquid capsule 270 contracts and pulls back to the outer half membrane 222, and the filter cloth 210 is restricted by the telescopic portion 224. A negative pressure is generated between the outer half membrane 222 and the filter cloth 210, thereby performing secondary water pumping on the mud cake. At the same time, the liquid capsule 270 has a multi-layer structure, and water in the mud cake can be extracted from top to bottom in sequence. The multi-layer drainage chambers 250 separated by the telescopic portion 224 cannot be completely separated, and then when extracting the corresponding water of the lower layer, the extracted water accumulated in the upper layer can be pumped into the lower layer, and finally gathered to the drainage hole 290 for discharge, thereby realizing secondary water pumping on the mud cake and enhancing the dehydration effect on the mud cake.

[0042] Embodiment 5: The telescopic portion 224 in the above embodiment has fully propped up the filter cloth 210, so that after the filter pressing is completed, it is difficult to directly push the mud cake to make it fall off; the embodiment of the present application is optimized to a certain extent on the basis of the above embodiment.

[0043] like Fig.14 As shown, the telescopic part 224 also includes an electromagnet 2241 and a permanent magnet 2242. The electromagnet 2241 is fixedly connected to the inside of the elastic plate 220. The electromagnet 2241 and the middle of the telescopic part 224 are at the same height. The permanent magnet 2242 is arranged inside the telescopic part 224, and the magnetic pole of the permanent magnet 2242 points to the electromagnet 2241.

[0044] Furthermore, the magnetic pole of the electromagnet 2241 points to the permanent magnet 2242, and the electromagnet 2241 is used to receive different electrical signals and change the strength and direction of the magnetic field.

[0045] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages: The telescopic part 224 is driven by the magnetic force between the electromagnet 2241 and the permanent magnet. After the mud cake is filtered, the magnetic pole of the electromagnet 2241 is changed intermittently, so that the telescopic part 224 continuously strikes the filter cloth 210, and the mud cake is completely removed from the filter cloth 210 under the action of inertia, thereby improving the processing efficiency.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sludge filter press, characterized in that: It comprises a base (100) and a filter plate (200); The base (100) comprises a support rod (110), a movable pressure plate (120) and a fixed pressure plate (130); Two support rods (110) are provided, and the support rods (110) are fixedly connected to the top of the base (100), and the support rods (110) are arranged horizontally; The fixed pressure plate (130) is fixedly connected to one end of the support rod (110); The movable pressing plate (120) is slidably connected to the support rod (110), and the movable pressing plate (120) is connected to the base (100) via a hydraulic telescopic rod; The filter plate (200) is slidably connected to the support rod (110); the filter plate (200) is disposed between the movable pressure plate (120) and the fixed pressure plate (130); the filter plate (200) comprises a filter cloth (210), an elastic plate (220) and a slurry conveying pipe (230); The filter cloth (210) is fixedly connected to the middle of the filter plate (200), two filter cloths (210) are provided, and the filter cloths (210) are used to filter out insoluble particles in the mud; The elastic plate (220) is fixedly connected to the middle of the filter plate (200), the elastic plate (220) is arranged between two filter cloths (210), two elastic plates (220) are provided, an inner cavity (240) is formed between the elastic plates (220), a drainage chamber (250) is formed between the elastic plate (220) and the filter cloth (210), and a mud chamber (260) is formed outside the filter cloth (210); The slurry delivery pipe (230) passes through the middle of the filter plate (200), and the slurry delivery pipe (230) is used for slurry delivery; A liquid capsule (270) is provided in the inner cavity (240), a water pump (280) is fixedly connected to the top of the filter plate (200), and the liquid capsule (270) is in communication with the water pump (280); The bottom of the drainage chamber (250) is provided with a drainage hole (290), and the drainage hole (290) is used for draining filtrate.

2. A sludge filter press according to claim 1, characterized in that: The elastic plate (220) further comprises an inner half membrane (221) and an outer half membrane (222), wherein the inner half membrane (221) is fixedly connected to one side of the elastic plate (220), the inner half membrane (221) is disposed in the inner cavity (240), the inner half membrane (221) is fixedly connected to the liquid capsule (270), and the inner half membrane (221) is made of a flexible material; The outer half membrane (222) is fixedly connected to the other side of the elastic plate (220), the outer half membrane (222) is arranged in the drainage chamber (250), the two ends of the outer half membrane (222) are in the same position as the two ends of the inner half membrane (221), and the outer half membrane (222) is made of a flexible material.

3. A sludge filter press according to claim 2, characterized in that: The inner half membrane (221) is provided in plurality, and the number of the outer half membrane (222) is the same as that of the inner half membrane (221).

4. A sludge filter press as claimed in claim 3, characterized in that: The elastic plate (220) is further provided with a through hole (223), and the through hole (223) is only provided in the portion of the elastic plate (220) between the inner half membrane (221) and the outer half membrane (222). The space between the inner half membrane (221) and the outer half membrane (222) is filled with liquid, and the through hole (223) is used for the liquid to pass through.

5. A sludge filter press as claimed in claim 4, characterized in that: The liquid capsule (270) further comprises an upper capsule (271) and a lower capsule (272); the upper capsule (271) is in communication with a water pump (280); the lower capsule (272) is arranged at the bottom of the upper capsule (271); and a plurality of lower capsules (272) are provided.

6. A sludge filter press as claimed in claim 5, characterized in that: The liquid capsule (270) further comprises a valve (273), a plurality of valves (273) are provided, and the valves (273) are provided between the upper capsule (271) and the lower capsule (272) and between adjacent lower capsules (272), and the valves (273) are used to control the switch of the water channel.

7. A sludge filter press according to claim 6, characterized in that: The elastic plate (220) further comprises a telescopic portion (224), the telescopic portion (224) being fixedly connected to one side of the elastic plate (220), the telescopic portion (224) being arranged in the drainage chamber (250), and the telescopic portion (224) being arranged between a plurality of outer half membranes (222).

8. A sludge filter press according to claim 7, characterized in that: The telescopic portion (224) is used to telescopically support or lower the filter cloth (210); when the telescopic portion (224) is contracted, the thickness relative to the elastic plate (220) is half the normal thickness of the outer half membrane (222); when the telescopic portion (224) is extended, the thickness relative to the elastic plate (220) is twice the thickness of the outer half membrane (222) when it is fully expanded.

9. A sludge filter press according to claim 8, characterized in that: The telescopic portion (224) further comprises an electromagnet (2241) and a permanent magnet (2242); the electromagnet (2241) is fixedly connected to the inside of the elastic plate (220); the electromagnet (2241) and the middle of the telescopic portion (224) are at the same height; the permanent magnet (2242) is arranged inside the telescopic portion (224); and the magnetic pole of the permanent magnet (2242) points to the electromagnet (2241).

10. A sludge filter press according to claim 9, characterized in that: The magnetic pole of the electromagnet (2241) points to the permanent magnet (2242), and the electromagnet (2241) is used to receive different electrical signals to change the intensity and direction of the magnetic field.

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