A filter press mechanism for a chemical filter press

Abstract

The present invention relates to the technical field of solid-liquid separation, specifically a filter press mechanism for a chemical filter press, comprising a shell assembly and a down-press assembly, the shell assembly comprising a cylindrical shell, an inner filter screen and an outer filter screen fixed inside the cylindrical shell, the down-press assembly comprising a lifting frame arranged above the cylindrical shell, an inner filter element arranged on the lifting frame, and an outer filter element for filter pressing a small amount of mixed liquid in a secondary filter press chamber; the invention also comprises a bottom sealing assembly which closes the bottom of the inner filter screen and the secondary filter press chamber during filter pressing and opens the bottom of the inner filter screen and the secondary filter press chamber during discharge; the present invention diverts the mixed liquid by the filter pore size of the inner filter screen and the outer filter screen to perform multi-stage filter pressing, reduces the pressure of the single-stage mesh cylinder filter pressing operation, improves the efficiency of solid-liquid separation, and scrapes the inner filter screen and the outer filter screen when the filter press plate and the filter press ring move downward, avoids solid residue on the inner filter screen and the outer filter screen, and minimizes the increase in filtration resistance caused by the blockage of the filter pores.

Description

Technical Field

[0001] The invention relates to the technical field of solid-liquid separation, in particular to a filter press mechanism for a chemical filter press. Background Art

[0002] A filter press is a mechanical device that applies a certain pressure to a mixed liquid to cause the liquid to seep out. It is a commonly used solid-liquid separation equipment and is widely used in chemical, pharmaceutical, metallurgical, dye, food, brewing, ceramics, and environmental protection industries.

[0003] When a traditional filter press is working, the mixed liquid is finally pressed into a filter cake under the squeezing effect of the extrusion force and the filtering effect of the filter cloth. The filtrate in the independent filter pressing space cannot be diverted, which leads to a higher filtering pressure on the filter cloth. In addition, after the filter cake is compacted, it adheres to the filter cloth and is generally discharged under the action of gravity. When necessary, it will be assisted by a vibration motor. However, this will cause residual solids on the filter cloth, and then the filter pores will be blocked, resulting in increased filtration resistance. It is often necessary to clean and unclog the filter cloth before use, which indirectly leads to a decrease in the filtration efficiency of the filter press. Summary of the Invention

[0004] The invention provides a filter pressing mechanism for a chemical filter press, which solves the problems in the related art that filtrate cannot be diverted and filter cake residues clog filter cloths during filtration in the filter press.

[0005] The present invention provides a filter press mechanism for a chemical filter press, comprising a shell assembly and a bottom sealing assembly arranged inside the shell assembly, the shell assembly comprising a cylindrical shell, a conical discharge hopper fixed to the bottom of the cylindrical shell, and an inner filter screen and an outer filter screen fixed inside the cylindrical shell, the bottom of the outer filter screen being fixedly connected to the inner wall of the cylindrical shell via a connecting ring to form a liquid storage cavity, the liquid in the liquid storage cavity being pumped out by a liquid pump fixed to the cylindrical shell; the annular space between the inner filter screen and the outer filter screen forming a secondary filter pressure cavity, the shell assembly further comprising a liquid inlet pipe for conveying a mixed liquid into the interior of the inner filter screen.

[0006] The filter press mechanism also includes a down-pressing assembly, which includes a lifting frame arranged above the cylindrical shell, an internal filter element arranged on the lifting frame, and an external filter element for filtering a small amount of mixed liquid in the secondary filter chamber; the bottom sealing assembly includes a fixed bottom plate located at the lower end of the cylindrical shell and a lifting bottom ring that slides up and down on the outside of the fixed bottom plate, and the outer diameter of the lifting bottom ring is smaller than the inner diameter of the cylindrical shell.

[0007] Initially, the bottom sealing assembly seals the bottom of the inner filter screen and the secondary filter pressure chamber. When the lifting frame moves downward, the inner filter element and the outer filter element filter the mixed liquid inside the inner filter screen and the secondary filter pressure chamber respectively. When the filtration is completed, the lifting frame continues to move downward to drive the bottom sealing assembly to no longer block the inner filter screen and the bottom of the secondary filter pressure chamber. When the lifting frame moves up and resets, it drives the bottom sealing assembly to seal the bottom of the inner filter screen and the secondary filter pressure chamber again.

[0008] In a possible implementation, the height of the inner filter is higher than that of the outer filter, and filter holes are only provided in the upper half of the inner filter, and the filter hole diameter of the inner filter is larger than that of the outer filter.

[0009] In one possible implementation, the inner filter element includes a circular tube fixed to the bottom of the lifting frame and slidingly passing through the top of the cylindrical shell, and a filter press plate arranged at the bottom of the circular tube, wherein the filter press plate contacts the inner wall of the inner filter screen.

[0010] In one possible implementation, the inner filter element also includes a material unloading auxiliary part, which includes a motor fixed on the top of the lifting frame, a rotating shaft fixed on the output end of the motor and a wavy scraper fixed on the bottom of the filter press plate. The rotating shaft passes through the center of the circular tube and is fixedly connected to the filter press plate. The circular tube and the filter press plate are rotatably connected.

[0011] In one possible implementation, the external filter element includes a filter ring that is slidably installed up and down in the secondary filter chamber, the inner and outer ring surfaces of the filter ring are in contact with the outer wall of the inner filter screen and the inner wall of the outer filter screen respectively, the lower surface of the filter ring is fixedly connected to a plurality of circumferentially evenly distributed triangular partitions, and the upper end face of the filter ring is fixedly connected to at least two circumferentially distributed fixing rods, which slide through the top of the cylindrical shell and are fixedly connected to the lifting frame.

[0012] In one possible implementation, the bottom sealing assembly also includes a conical cover fixedly mounted on the upper surface of the fixed bottom plate and with an open top, a guide ring and a sealing ring fixedly mounted on the upper surface of the lifting bottom ring and concentrically distributed, the guide ring is located inside the sealing ring, and the gap between the two is the same as the wall thickness of the inner filter screen, the conical cover and the guide ring jointly seal the bottom of the inner filter screen, and the sealing ring seals the bottom of the secondary filter press chamber.

[0013] The bottom end of the fixed bottom plate is fixedly connected to the inner wall of the conical discharge hopper through a plurality of support rods. The liquid inlet pipe passes through the fixed bottom plate, and the pump body liquid outlet on the liquid inlet pipe is connected to the opening at the top of the bamboo hat-shaped cover.

[0014] In one possible implementation, the inner surface of the guide ring is sloped, and the distance between the inner and outer surfaces of the guide ring gradually increases from top to bottom. The bottom of the guide ring and the bottom of the conical cover are butted together to form a recessed area that gradually sinks from the center to the edge and from the edge to the center.

[0015] In one possible implementation, the filter press mechanism also includes two symmetrically arranged locking members for locking the lifting bottom ring, the locking members including a guide groove provided on the outer wall of the cylindrical shell near the lower end, a guide cover with an open upper end and a closed lower end fixedly installed on the outer wall of the cylindrical shell corresponding to the position of the guide groove, the longitudinal section of the guide cover is an inverted L-shape, a lifting block that slides up and down along the guide groove is fixedly installed at the lower end of the lifting bottom ring, a rectangular groove is provided at the end of the lifting block away from the axis of the lifting bottom ring, and a transverse sliding block that slides laterally is elastically connected in the rectangular groove, during the process of opening the bottom of the inner filter screen and the bottom of the secondary filter press chamber, the transverse sliding block slides along the vertical part of the guide cover, and during the process of sealing the bottom of the inner filter screen and the bottom of the secondary filter press chamber, the transverse sliding block overlaps the horizontal part of the guide cover.

[0016] In one possible implementation, the locking member also includes an unlocking portion for releasing the lock of the transverse block on the lifting block, and the unlocking portion includes a wedge-shaped groove provided on the upper surface of the transverse block, the inclined surface of the wedge-shaped groove faces the center of the lifting bottom ring, and the wedge-shaped groove gradually tilts from top to bottom in a direction away from the axis of the lifting bottom ring. A downward pressure rod is fixedly installed at the position of the guide cover at the top of the lifting frame, and the bottom end of the downward pressure rod is an inclined surface that cooperates with the inclined surface of the wedge-shaped groove. A protrusion is integrally formed with the inner wall of the wedge groove, and the protrusion is located at the top of the inner wall of the wedge groove. A locking groove that plugs and cooperates with the protrusion is provided on the side of the downward pressure rod away from the axis of the lifting bottom ring.

[0017] The above-mentioned one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: 1. The present invention diverts the mixed liquid according to the filter pore size of the inner filter and the outer filter to perform multi-stage filtration, reducing the pressure of the single-stage mesh drum filtration operation, improving the efficiency of solid-liquid separation, and scraping the inner filter and the outer filter when the filter plate and the filter ring move downward to avoid solid residue on the inner filter and the outer filter, thereby minimizing the increase in filtration resistance caused by the blockage of the filter pores.

[0018] 2. During the downward movement of the lifting frame, the filter pressing operation is carried out first. After the filter pressing operation is completed, it can continue to move downward to release the support of the lifting bottom ring through the cooperation of the lower pressure rod and the transverse movement block, so that the downward moving lifting bottom ring drives the guide ring and the sealing ring to no longer block the inner filter screen and the secondary filter pressure cavity, which is convenient for the discharge of the solid product after filtration.

[0019] 3. The special shapes of the guide ring and the conical cover can speed up the discharge of solids. At the same time, the auxiliary operation of the material can disperse the compacted filter cake, making it easier for the solids to fall.

[0020] 4. During the upward movement of the lifting frame, it can not only drive the internal and external pressure filter elements to reset, but also drive the lifting bottom ring to move upward synchronously. When the lifting bottom ring rises to be flush with the fixed bottom plate, the locking piece is used to adaptively lock and fix the lifting bottom ring again, so that the inner filter screen and the secondary pressure filter cavity are re-blocked.

[0021] 5. The inner filter screen of the present invention is inserted into the gap between the guide ring and the sealing ring, and the bottom of the inner filter screen is in contact with the top of the lifting bottom ring so that the mixed liquid in the inner filter screen can only flow to the secondary filter chamber through the filter holes, ensuring that when the mixed liquid in the inner filter screen is filtered, the liquid will not flow out from the bottom of the inner filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] Figure 2 It is a schematic cross-sectional view of the beginning of filter pressing in the present invention.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner filter and the outer filter.

[0025] Figure 4 Schematic diagram of the three-dimensional structure of the filter press plate.

[0026] Figure 5 for Figure 4 Schematic diagram of the enlarged area C in the middle.

[0027] Figure 6 This is a partial structural diagram of the external pressure filter.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the fixed base plate and the conical cover.

[0029] Figure 8 It is a cutaway perspective view of the lifting bottom ring and the guide ring.

[0030] Figure 9 It is a schematic cross-sectional view of the filter press process of the present invention.

[0031] Figure 10 for Figure 1 A magnified schematic diagram of area A in the middle.

[0032] Figure 11 for Figure 9 Schematic diagram of the enlarged area B.

[0033] Figure 12 This is a cross-sectional diagram of the back cover assembly after it is opened.

[0034] Figure: 1 Shell assembly, 2 Down-pressure assembly; 3 Legs; 4 Bottom assembly; 11 Cylindrical shell; 12 Conical discharge hopper; 13 Inner filter screen; 14 Outer filter screen; 15 Connecting ring; 16 Liquid inlet pipe; 17 Liquid pump; 21 Cylinder; 22 Lifting frame; 23 Inner filter element; 231 Round tube; 232 Filter plate; 233 Motor; 234 Rotating shaft; 235 Wave-shaped scraper; 24 Outer filter element; 2 41. Fixed rod; 242. Filter press ring; 243. Triangular partition; 41. Fixed bottom plate; 42. Support rod; 43. Cone-shaped cover; 44. Lifting bottom ring; 45. Locking piece; 451. Guide cover; 452. Guide groove; 453. Lifting block; 454. Rectangular groove; 455. Spring; 456. Transverse block; 457. Wedge groove; 458. Press down rod; 459. Locking groove; 46. Guide ring; 47. Sealing ring. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described below, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] See also Figure 1 、 Figure 2 and Figure 3, a filter press mechanism for a chemical filter press, comprising a shell assembly 1 standing on the ground through legs 3, a bottom sealing assembly 4 arranged inside the shell assembly 1 and a down-pressing assembly 2 slidably arranged on the shell assembly 1; the shell assembly 1 comprises a cylindrical shell 11 with a closed top and an open bottom, a conical discharge hopper 12 fixed to the bottom of the cylindrical shell 11, an inner filter screen 13 and an outer filter screen 14 fixed inside the cylindrical shell 11; the conical discharge hopper 12 is a funnel-shaped structure with a larger top and a smaller bottom, the inner filter screen 13 and the outer filter screen 14 are distributed in concentric circles, and the top ends of the two are fixed to the inner top wall of the cylindrical shell 11, the bottom end of the inner filter screen 13 is lower than the bottom end of the outer filter screen 14, and only the upper half of the inner filter screen 13 is provided with filter holes, and the bottom of the outer filter screen 14 is connected The connecting ring 15 is fixedly connected to the inner wall of the cylindrical shell 11, the inner filter 13 performs primary filtration on the mixed liquid, and the outer filter 14 performs secondary filtration on the mixed liquid. The annular space between the inner filter 13 and the outer filter 14 forms a secondary filter pressure chamber; the annular space between the outer filter 14 and the cylindrical shell 11 forms a liquid storage chamber; a liquid pump 17 is fixedly provided on the outer wall of the cylindrical shell 11 and close to the upper surface of the connecting ring 15, the liquid inlet of the liquid pump 17 is connected to the liquid storage chamber, and the liquid outlet of the liquid pump 17 is connected to the external pipeline, so as to extract the liquid after the filter pressure; the shell assembly 1 also includes a liquid inlet pipe 16 extending from the bottom opening into the interior of the conical discharge hopper 12, and a pump body is provided at the end of the liquid inlet pipe 16, which pumps the mixed liquid to the interior of the inner filter 13.

[0037] During the filtration operation, the bottom sealing assembly 4 seals the bottom of the inner filter 13 and the bottom of the annular space between the inner filter 13 and the outer filter 14. When the filtration is completed, the bottom of the inner filter 13 and the bottom of the annular cavity are opened to allow the chemical product to be discharged.

[0038] It should be noted that the pore diameter of the inner filter 13 is slightly larger than the pore diameter of the outer filter 14, so that part of the mixed liquid can be discharged from the pores of the inner filter 13 into the secondary filter pressure chamber, and the mixed liquid is diverted and filtered, thereby reducing the filtration pressure of the inner filter 13. The inner filter 13 is a dense metal mesh cylinder structure, and the outer filter 14 is composed of a rigid cylindrical frame and a filter cloth fixed on the cylindrical frame.

[0039] It should be noted that the number of outer filters 14 can be increased according to actual filter pressure requirements. The specific method is: several outer filters 14 are fixedly installed on the outside of the inner filter 13 in a concentric circle distribution manner. The outermost outer filter 14 is fixedly connected to the inner wall of the cylindrical shell 11 through the connecting ring 15 to form a liquid storage cavity. The annular space between the outer filter 14 and the inner filter 13 still forms a secondary filter pressure cavity. The third and fourth filter pressure cavities are formed from the inside to the outside of the secondary filter pressure cavity. The filter holes of the inner filter 13 and the filter holes of several outer filters 14 can be selected with appropriate diameters according to actual needs.

[0040] See also Figure 1 and Figure 2 The down-pressing assembly 2 includes a lifting frame 22 which is arranged above the cylindrical shell 11 and slides up and down. Two symmetrically distributed cylinders 21 are fixedly installed on the outer wall of the cylindrical shell 11, and the telescopic ends of the cylinders 21 are fixedly connected to the lifting frame 22. An internal pressure filter 23 is installed at the center of the lifting frame 22. The internal pressure filter 23 includes a circular tube 231 fixed to the bottom of the lifting frame 22 and sliding through the top of the cylindrical shell 11, and a filter plate 232 arranged at the bottom of the circular tube 231. The filter plate 232 contacts the inner wall of the inner filter screen 13. When the cylinder 21 contracts and drives the lifting frame 22 to move downward, the filter plate 232 squeezes the mixed liquid inside the inner filter screen 13.

[0041] See Figure 2 and Figure 5 The inner filter element 23 also includes a material unloading auxiliary part, which includes a motor 233 fixed on the top of the lifting frame 22, a rotating shaft 234 fixed on the output end of the motor 233 and a wavy scraper 235 fixed on the bottom of the filter press plate 232. The rotating shaft 234 passes through the center of the circular tube 231 and is fixedly connected to the filter press plate 232. The circular tube 231 and the filter press plate 232 are rotatably connected. After the mixed liquid is hydraulically filtered into a filter cake, in order to facilitate the discharge of the solid filter cake, the filter cake needs to be dispersed. Specifically, the rotating shaft 234 is driven to rotate by the motor 233, and the wavy scraper 235 is driven to rotate by the filter press plate 232. The wavy scraper 235 cuts and disperses the solid filter cake for discharge.

[0042] See also Figure 2 and Figure 6 The down-pressure assembly 2 also includes an external filter element 24 for filtering a small amount of mixed liquid in the secondary filter press cavity. The external filter element 24 includes a filter ring 242 that is slidably installed in the secondary filter press cavity. The inner and outer annular surfaces of the filter ring 242 are in contact with the outer wall of the inner filter screen 13 and the inner wall of the outer filter screen 14 respectively. The upper end surface of the filter ring 242 is fixedly connected to at least two circumferentially distributed fixing rods 241. The fixing rods 241 slide through the top of the cylindrical shell 11 and are fixedly connected to the lifting frame 22. The lower surface of the filter ring 242 is fixedly connected to a plurality of circumferentially evenly distributed triangular partitions 243.

[0043] When the lifting frame 22 descends and drives the inner filter element 23 to filter the mixed liquid in the inner filter screen 13, the outer filter element 24 also descends to filter the small amount of mixed liquid in the secondary filter pressure chamber. The liquid flows from the filter holes on the inner filter screen 13 to the secondary filter pressure chamber, and then flows from the filter holes on the outer filter screen 14 to the liquid storage chamber. Most of the solids remain in the inner filter screen 13, and a small amount of solids remain in the secondary filter pressure chamber. After the bottom sealing component 4 opens the bottom of the inner filter screen 13 and the bottom of the secondary filter pressure chamber, it can be discharged.

[0044] It should be noted that when there are at least two external filter screens 14 , the number of the corresponding external pressure filter elements 24 is the same as the number of the external filter screens 14 .

[0045] See also Figure 2 、 Figure 7 and Figure 8 The bottom sealing assembly 4 includes a fixed bottom plate 41 at the lower end of the cylindrical shell 11 and a lifting bottom ring 44 that is slidably sleeved on the outside of the fixed bottom plate 41. The bottom end of the fixed bottom plate 41 is fixedly connected to the inner wall of the conical discharge hopper 12 through a number of support rods 42. The top of the fixed bottom plate 41 is fixedly installed with a bamboo hat-shaped cover 43 with an open top. The liquid inlet pipe 16 passes through the fixed bottom plate 41, and the pump body outlet on the liquid inlet pipe 16 is connected to the opening at the top of the bamboo hat-shaped cover 43. The outer diameter of the lifting bottom ring 44 is smaller than the inner diameter of the cylindrical shell 11. The top of the lifting bottom ring 44 is fixed with a concentrically distributed guide ring 46 and a blocking ring 47, wherein the guide ring 46 is located inside the blocking ring 47, and the gap between the two is the same as the wall thickness of the inner filter 13. The inner ring surface of the guide ring 46 is The bottom of the inner filter screen 13 is in contact with the top of the lifting bottom ring 44, and the bottom of the guide ring 46 and the bottom of the conical cover 43 are connected together to form a concave area that gradually sinks from the center to the edge and from the edge to the center. When the mixed liquid is pumped from the top of the conical cover 43 to the inside of the inner filter screen 13 by the pump body on the liquid inlet pipe 16, it will first flow along the outer wall of the conical cover 43 to the concave area. When the liquid level in the concave area gradually rises, the liquid level will first submerge the highest point of the conical cover 43 and the guide ring 46 and gradually rise.

[0046] See also Figure 2 and Figure 8 The sealing ring 47 is higher than the guide ring 46. The sealing ring 47 is an annular shell with a sloped top. The slope of the top of the sealing ring 47 gradually tilts upward from the edge to the center. When the inner filter 13 is inserted into the gap between the guide ring 46 and the sealing ring 47, the top of the sealing ring 47 seals the bottom of the secondary filter press cavity. When the filter press ring 242 moves downward, the liquid will flow from the outer filter 14 to the liquid storage cavity, and the remaining solids or semi-solids will remain on the top of the sealing ring 47.

[0047] It should be noted that, since the amount of solids in the mixed liquid in the secondary filter press chamber is small, after the filtration is completed, the residue in the secondary filter press chamber is a semi-solid with poor fluidity, and of course it may also be a compacted solid. When the lifting bottom ring 44 descends, the lifting bottom ring 44 drives the guide ring 46 and the sealing ring 47 to descend accordingly. At this time, the connection between the conical cover 43 and the guide ring 46 is separated, and the sealing ring 47 no longer blocks the secondary filter press chamber. The semi-solid slides down along the slope. The setting of several triangular partitions 243 cuts off the connection between the semi-solids, making it easier for the semi-solids to slide.

[0048] It should be noted that when there are three-stage filter press cavities, four-stage filter press cavities, etc., the blocking ring 47 needs to seal the bottoms of the two-stage filter press cavities, the three-stage filter press cavities, and the four-stage filter press cavities.

[0049] See also Figure 2 、 Figure 4 and Figure 5 After the filtration is completed, the mixed liquid inside the inner filter screen 13 will form a filter cake in the recessed area, and the filter cake will be dispersed by the auxiliary material discharge part, so that after the guide ring 46 moves downward, the dispersed filter cake can slide down along the surface of the conical cover 43 and the guide ring 46, and finally be discharged from the conical discharge hopper 12; the wavy scraper 235 is arranged in plurality along the radial direction of the filter press plate 232, and the wavy scraper 235 near the center of the filter press plate 232 has the smallest length. The wavy scrapers 235 of different lengths are used to avoid the conical cover 43, and the special shape of the wavy scraper 235 increases its cutting range during rotation.

[0050] See also Figure 1 、 Figure 9 、 Figure 10 and Figure 11 The filter press mechanism also includes two symmetrically arranged locking members 45 for locking the lifting bottom ring 44. The locking member 45 includes a guide groove 452 opened on the outer wall of the cylindrical shell 11 near the lower end. A guide cover 451 with an open upper end and a closed lower end is installed on the outer wall of the cylindrical shell 11 corresponding to the guide groove 452. The longitudinal section of the guide cover 451 is an inverted L-shaped, and the vertical part of the guide cover 451 is fixedly connected to the outer wall of the cylindrical shell 11. The lower end of the lifting bottom ring 44 is fixedly installed with a lifting block 453 that slides up and down along the guide groove 452. The lifting block 453 is provided with a rectangular groove 454 at one end away from the axis of the lifting bottom ring 44, and a transverse sliding block 456 is connected to the rectangular groove 454 by a spring 455. The transverse sliding block 456 can slide along the vertical part of the guide cover 451, and can also overlap the horizontal part of the guide cover 451 to lock the position of the lifting block 453 and the lifting bottom ring 44.

[0051] See also Figure 10 、 Figure 11 and Figure 12The locking member 45 also includes an unlocking portion for releasing the lock of the lifting block 453 by the lateral movement block 456. The unlocking portion includes a wedge-shaped groove 457 formed on the upper surface of the lateral movement block 456. The inclined surface of the wedge-shaped groove 457 faces the center of the lifting bottom ring 44, and the wedge-shaped groove 457 gradually tilts from top to bottom in a direction away from the axis of the lifting bottom ring 44. A downward pressing rod 458 is fixedly installed at the top of the lifting frame 22 at the position corresponding to the wedge-shaped groove 457, and the bottom end of the downward pressing rod 458 is an inclined surface that cooperates with the inclined surface of the wedge-shaped groove 457. When the lifting frame 22 moves downward, the downward pressing rod 458 is driven to move downward accordingly. When the inclined surface contacts the inclined surface of the wedge-shaped groove 457, it pushes the transverse block 456 to move toward the inside of the rectangular groove 454. At this time, the spring 455 is gradually compressed, and the transverse block 456 is no longer overlapped with the horizontal part of the guide cover 451. When the lifting frame 22 continues to move downward, since the transverse block 456 no longer locks the position of the lifting block 453, the lifting bottom ring 44 and the lifting block 453 will move downward under the action of gravity and the push of the lower pressure rod 458. The bottom of the inner filter 13 and the bottom of the secondary filter pressure chamber are no longer blocked. When the lifting block 453 slides to the lowest point of the guide groove 452, the lifting frame 22 no longer moves downward.

[0052] When the lifting frame 22 rises, in order to enable the lower pressure rod 458 to drive the lateral movement block 456, the lifting block 453 and the lifting bottom ring 44 to move upward together, a protrusion is integrally formed on the inner wall of the wedge-shaped groove 457. The protrusion is located at the top of the inner wall of the wedge-shaped groove 457. A locking groove 459 that is plugged into and cooperates with the protrusion is opened on the side of the lower pressure rod 458 away from the axis of the lifting bottom ring 44. During the downward movement of the lower pressure rod 458, the inclined surface at the bottom end of the lower pressure rod 458 pushes the lateral movement block 456 into the rectangular groove 454. During the lateral movement of the protrusion in the wedge-shaped groove 457 The locking groove 459 is inserted into the lower pressure rod 458. When the lower pressure rod 458 rises, the locking groove 459 can drive the protrusion to move upward, and then drive the transverse block 456, the lifting block 453 and the lifting bottom ring 44 to move upward synchronously. When the transverse block 456 moves to the horizontal part of the guide cover 451, the transverse block 456 is pushed out of the rectangular groove 454 by the spring 455 and overlaps the horizontal part of the guide cover 451. At this point, the lifting bottom ring 44 is flush with the fixed bottom plate 41 again, and the bottom of the inner filter screen 13 and the bottom of the secondary filter pressure chamber are blocked again.

[0053] Working process: Initially, the transverse block 456 is overlapped on the horizontal part of the guide cover 451, the lifting bottom ring 44 is flush with the upper surface of the fixed bottom plate 41, the bottom of the inner filter 13 and the bottom of the secondary filter pressure chamber are blocked, and the pump body on the liquid inlet pipe 16 pumps the mixed liquid into the interior of the inner filter 13. Then the cylinder 21 contracts and drives the lifting frame 22 to descend. The filter plate 232 squeezes the mixed liquid inside the inner filter 13, and the filter ring 242 also descends to filter the small amount of mixed liquid in the secondary filter pressure chamber. When the filtration is completed, the motor 233 drives the rotating shaft 234 to rotate, and then the filter plate 232 drives the wavy scraper 235 to rotate, and the wavy scraper 235 cuts and disperses the solid filter cake.

[0054] After that, the lifting frame 22 continues to move downward, and the inclined surface of the bottom end of the lower pressure rod 458 begins to contact the inclined surface of the wedge groove 457 and begins to push the transverse block 456 to move toward the inside of the rectangular groove 454. The protrusion in the wedge groove 457 is inserted into the locking groove 459 on the lower pressure rod 458 during the transverse movement. When the transverse block 456 is no longer overlapped on the horizontal part of the guide cover 451, the position of the lifting block 453 and the lifting bottom ring 44 is unlocked, and the lifting bottom ring 44 and the lifting block 453 will move downward under the action of gravity and the push of the lower pressure rod 458. The bottom of the inner filter screen 13 and the bottom of the secondary filter chamber are no longer blocked, and the dispersed solids are discharged from the conical discharge hopper 12 through the channel opened between the conical cover 43 and the guide ring 46, while the semi-solids with poor fluidity slide down along the slope at the top of the blocking ring 47 and finally flow to the conical discharge hopper 12 from the intermittent flow between the lifting bottom ring 44 and the cylindrical shell 11 and are discharged.

[0055] As the distance the lifting frame 22 moves downward gradually increases, the degree to which the bottom of the inner filter 13 and the bottom of the secondary filter pressure chamber are opened also increases. When the cylinder 21 extends and drives the lifting frame 22 to move upward, the lower pressure rod 458 rises accordingly, and the locking groove 459 can drive the protrusion to move upward, thereby driving the transverse block 456, the lifting block 453 and the lifting bottom ring 44 to move upward synchronously. When the transverse block 456 moves to the horizontal part of the guide cover 451, the transverse block 456 is pushed out of the rectangular groove 454 by the spring 455 and overlaps the horizontal part of the guide cover 451. At this point, the lifting bottom ring 44 is flush with the fixed bottom plate 41 again, and the bottom of the inner filter 13 and the bottom of the secondary filter pressure chamber are blocked again.

[0056] The pump body on the liquid inlet pipe 16 pumps the mixed liquid into the inner filter screen 13 again, and the pump body outlet is blocked by solids due to pressure filtration and will reopen under the impact of the high-pressure mixed liquid.

[0057] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0058] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they can refer to fixed or detachable connections, integral or sliding connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0059] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filter press mechanism for a chemical filter press, characterized by: The housing assembly includes a cylindrical shell, a conical discharge hopper fixed to the bottom of the cylindrical shell, and an inner filter screen and an outer filter screen fixed inside the cylindrical shell. The bottom of the outer filter screen is fixedly connected to the inner wall of the cylindrical shell by a connecting ring to form a liquid storage cavity. The liquid in the liquid storage cavity is pumped out by a liquid pump; the annular space between the inner filter screen and the outer filter screen forms a secondary pressure filter chamber. The housing assembly also includes a liquid inlet pipe for conveying the mixed liquid into the inner filter screen. The filter press mechanism also includes a pressing assembly and a bottom sealing assembly arranged inside the cylindrical shell. The pressing assembly includes a lifting frame arranged above the cylindrical shell, an inner pressure filter element and an outer pressure filter element arranged on the lifting frame. The bottom sealing assembly includes a fixed bottom plate located at the lower end of the cylindrical shell, and a lifting bottom ring slidably sleeved on the outside of the fixed bottom plate, wherein the outer diameter of the lifting bottom ring is smaller than the inner diameter of the cylindrical shell; Initially, the bottom of the inner filter screen and the secondary filter pressure chamber are both closed. When the lifting frame moves downward, the filter pressing operation is performed first, and then the bottom sealing assembly is driven to contact and seal the inner filter screen and the secondary filter pressure chamber. When the lifting frame moves upward and resets, the bottom sealing assembly is driven to seal the inner filter screen and the bottom of the secondary filter pressure chamber again. The inner filter element comprises a circular tube fixed to the bottom of the lifting frame and slidingly passing through the top of the cylindrical shell, and a filter press plate arranged at the bottom of the circular tube, the filter press plate being in contact with the inner wall of the inner filter screen; The inner filter element further includes a material discharge auxiliary part, which includes a motor fixed to the top of the lifting frame, a rotating shaft fixed to the output end of the motor, and a wavy scraper fixed to the bottom of the filter press plate. The rotating shaft passes through the center of the circular tube and is fixedly connected to the filter press plate. The circular tube and the filter press plate are rotatably connected. The bottom sealing assembly also includes a conical cover fixedly mounted on the upper surface of the fixed bottom plate and having an open top, a guide ring and a blocking ring fixedly mounted on the upper surface of the lifting bottom ring and concentrically distributed, the guide ring being located inside the blocking ring, and the gap between the guide ring and the blocking ring being the same as the wall thickness of the inner filter screen, the conical cover and the guide ring jointly blocking the bottom of the inner filter screen, and the blocking ring blocking the bottom of the secondary filter pressure chamber; The bottom end of the fixed bottom plate is fixedly connected to the inner wall of the conical discharge hopper through a plurality of support rods, the liquid inlet pipe passes through the fixed bottom plate, and the pump body liquid outlet on the liquid inlet pipe is connected to the opening at the top of the bamboo hat-shaped cover; The inner surface of the guide ring is sloped, and the distance between the inner and outer surfaces of the guide ring gradually increases from top to bottom. The bottom of the guide ring and the bottom of the conical cover are butted together to form a concave area that gradually sinks from the center to the edge and from the edge to the center.

2. The filter press mechanism for a chemical filter press according to claim 1, characterized in that: The height of the inner filter screen is higher than that of the outer filter screen, and the inner filter screen has filter holes only on the upper half thereof, and the filter hole diameter of the inner filter screen is larger than the filter hole diameter of the outer filter screen.

3. The filter press mechanism for a chemical filter press according to claim 1, characterized in that: The external filter element includes a filter ring that is slidably installed up and down in the secondary filter chamber. The inner and outer ring surfaces of the filter ring are in contact with the outer wall of the inner filter screen and the inner wall of the outer filter screen respectively. The lower surface of the filter ring is fixedly connected to a plurality of triangular partitions that are evenly distributed circumferentially. The upper end surface of the filter ring is fixedly connected to at least two circumferentially distributed fixing rods, which slide through the top of the cylindrical shell and are fixedly connected to the lifting frame.

4. The filter press mechanism for a chemical filter press according to claim 1, characterized in that: The filter press mechanism also includes two symmetrically arranged locking members for locking the lifting bottom ring, the locking members including a guide groove provided on the outer wall of the cylindrical shell near the lower end, a guide cover with an open upper end and a closed lower end fixedly installed on the outer wall of the cylindrical shell corresponding to the position of the guide groove, the longitudinal section of the guide cover is an inverted L-shape, a lifting block sliding up and down along the guide groove is fixedly installed on the lower end of the lifting bottom ring, a rectangular groove is provided on the end of the lifting block away from the axis of the lifting bottom ring, and a transverse sliding block sliding laterally is elastically connected in the rectangular groove, when the bottom of the inner filter screen and the bottom of the secondary filter press chamber are opened, the transverse sliding block slides along the vertical part of the guide cover, and when the bottom of the inner filter screen and the bottom of the secondary filter press chamber are blocked, the transverse sliding block overlaps the horizontal part of the guide cover.

5. The filter press mechanism for a chemical filter press according to claim 4, characterized in that: The locking member also includes an unlocking portion for releasing the lock of the transverse block on the lifting block, and the unlocking portion includes a wedge-shaped groove provided on the upper surface of the transverse block, the inclined surface of the wedge-shaped groove faces the center of the lifting bottom ring, and the wedge-shaped groove gradually inclines from top to bottom in a direction away from the axis of the lifting bottom ring. A downward pressure rod is fixedly installed at the position of the guide cover at the top of the lifting frame, and the bottom end of the downward pressure rod is an inclined surface that cooperates with the inclined surface of the wedge-shaped groove. A protrusion is integrally formed with the inner wall of the wedge groove, and the protrusion is located at the top of the inner wall of the wedge groove. A locking groove that plugs and cooperates with the protrusion is provided on the side of the downward pressure rod away from the axis of the lifting bottom ring.

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