Filter pressing mechanism for chemical filter press

Abstract

The invention relates to the technical field of solid-liquid separation, in particular to a filter pressing mechanism for a chemical filter press, which comprises a shell assembly and a pressing assembly, the shell assembly comprises a cylindrical shell, an inner filter screen and an outer filter screen, and the inner filter screen and the outer filter screen are fixed in the cylindrical shell; the downward pressing assembly comprises a lifting frame arranged above the cylindrical shell, an inner filter pressing piece arranged on the lifting frame and an outer filter pressing piece used for carrying out filter pressing on a small amount of mixed liquid in the secondary filter pressing cavity; the bottom sealing assembly is used for sealing the bottom of the inner filter screen and the bottom of the secondary filter pressing cavity during filter pressing and opening the bottom of the inner filter screen and the bottom of the secondary filter pressing cavity during discharging; mixed liquid is shunted according to the sizes of the filter holes of the inner filter screen and the outer filter screen, so that multi-stage filter pressing is performed, the pressure of single-stage screen cylinder filter pressing operation is reduced, the solid-liquid separation efficiency is improved, the inner filter screen and the outer filter screen can be scraped when the filter pressing plate and the filter pressing ring move downwards, solids are prevented from being left on the inner filter screen and the outer filter screen, and the solid-liquid separation efficiency is improved. The filter resistance increase caused by the blockage of the filter holes is reduced as much as possible.

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 seal assembly seals both the inner filter screen and the bottom of the secondary pressure filtration chamber. When the lifting frame moves downward, the inner pressure filtration component and the outer pressure filtration component respectively perform pressure filtration on the liquid mixture inside the inner filter screen and the secondary pressure filtration chamber. When the pressure filtration is completed, the lifting frame continues to move downward to drive the bottom seal assembly to no longer block the bottom of the inner filter screen and the secondary pressure filtration chamber. When the lifting frame moves upward and resets, it drives the bottom seal assembly to seal the bottom of the inner filter screen and the secondary pressure filtration chamber again.

[0008] In a possible implementation manner, the height of the inner filter screen is higher than that of the outer filter screen, and only the upper half of the inner filter screen is provided with filter holes. The diameter of the filter holes of the inner filter screen is larger than that of the outer filter screen.

[0009] In a possible implementation manner, the inner pressure filtration component includes a round tube fixed to the bottom of the lifting frame and sliding through the top of the cylindrical shell, and a pressure filtration plate provided at the bottom of the round tube. The pressure filtration plate is in contact with the inner wall of the inner filter screen.

[0010] In a possible implementation manner, the inner pressure filtration component further includes a blanking auxiliary part. The blanking auxiliary part 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 scraping plate fixed to the bottom of the pressure filtration plate. The rotating shaft penetrates through the center of the round tube and is fixedly connected to the pressure filtration plate. The round tube and the pressure filtration plate are rotatably connected.

[0011] In a possible implementation manner, the outer pressure filtration component includes a pressure filtration ring slidably mounted up and down in the secondary pressure filtration chamber. The inner and outer ring surfaces of the pressure filtration ring are respectively in contact with the outer wall of the inner filter screen and the inner wall of the outer filter screen. A plurality of circumferentially uniformly distributed triangular partition plates are fixedly connected to the lower surface of the pressure filtration ring. At least two fixing rods distributed in a circle are fixedly connected to the upper end surface of the pressure filtration ring. The fixing rods slide through the top of the cylindrical shell and are fixedly connected to the lifting frame.

[0012] In a possible implementation manner, the bottom seal assembly further includes a bamboo hat-shaped cover fixedly installed on the upper surface of the fixed bottom plate with an open top, a guide ring and a blocking ring fixedly installed on the upper surface of the lifting bottom ring and distributed concentrically. The guide ring is located inside the blocking ring, and the gap between them is the same as the wall thickness of the inner filter screen. The bamboo hat-shaped cover and the guide ring jointly block the bottom of the inner filter screen, and the blocking ring blocks the bottom of the secondary pressure filtration 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 penetrates through the fixed bottom plate, and the liquid outlet of the pump body on the liquid inlet pipe is communicated with the open top of the bamboo hat-shaped cover.

[0014] In a possible implementation manner, the inner ring surface of the guide ring is in a slope shape, and the distance between the inner and outer ring surfaces of the guide ring gradually increases from top to bottom. The bottom of the guide ring and the bottom of the bamboo hat-shaped cover are butted together to form a sunken 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 inner pressure filter element and the outer pressure filter element to reset, but also drive the lifting bottom ring to move upward synchronously. And when the lifting bottom ring rises to be flush with the fixed bottom plate, the locking part 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-sealed.

[0021] 5. In the present invention, the inner filter screen is inserted into the gap between the material guiding ring and the sealing ring, and the bottom of the inner filter screen is in contact with and abuts against the top of the lifting bottom ring, so that the mixed liquid in the inner filter screen can only flow into the secondary pressure filter cavity through the filter holes, ensuring that when the mixed liquid in the inner filter screen is pressure-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 three-dimensional structure schematic diagram of the present invention.

[0023] Figure 2 It is a sectional schematic diagram of the present invention when pressure filtration starts.

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

[0025] Figure 4 It is a three-dimensional structure schematic diagram of the pressure filter plate.

[0026] Figure 5 It is Figure 4 An enlarged schematic diagram of area C in

[0027] Figure 6 It is a partial structure schematic diagram of the outer pressure filter element. [[ID=3**2]]

[0028] Figure 7 It is a three-dimensional structure schematic diagram of the fixed bottom plate and the bamboo hat-shaped cover.

[0029] Figure 8 It is a sectional three-dimensional view of the lifting bottom ring and the material guiding ring.

[0030] Figure 9 It is a sectional schematic diagram of the present invention during the pressure filtration process.

[0031] Figure 10 It is Figure 1 An enlarged schematic diagram of area A in

[0032] Figure 11 It is Figure 9 An enlarged schematic diagram of area B in

[0033] Figure 12 It is a sectional schematic diagram after the bottom sealing assembly is opened.

[0034] In the figure: 1 housing assembly, 2 lower pressing assembly; 3 legs; 4 bottom sealing 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 extraction pump; 21 cylinder; 22 lifting frame; 23 inner pressure filter element; 231 round pipe; 232 filter pressing plate; 233 motor; 234 rotating shaft; 235 wavy scraper; 24 outer pressure filter element; 241 fixed rod; 242 filter pressing ring; 243 triangular partition; 41 fixed bottom plate; 42 support rod; 43 bamboo hat-shaped cover; 44 lifting bottom ring; 45 locking member; 451 guide cover; 452 guide through groove; 453 lifting block; 454 rectangular groove; 455 spring; 456 transverse moving block; 457 wedge-shaped groove; 458 lower pressing rod; 459 locking groove; 46 material guiding ring; 47 sealing ring. Detailed implementation manners

[0035] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation manners disclosed below.

[0036] Please refer to Figure 1 、 Figure 2 and Figure 3, a filter pressing mechanism for a chemical filter press, comprising a housing assembly 1 standing on the ground through legs 3, a bottom sealing assembly 4 arranged inside the housing assembly 1, and a downward pressing assembly 2 slidably arranged up and down on the housing assembly 1; the housing assembly 1 includes 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 in the shape of a funnel with a larger top and a smaller bottom, the inner filter screen 13 and the outer filter screen 14 are concentrically distributed, and the tops of both 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. The bottom of the outer filter screen 14 is fixedly connected to the inner wall of the cylindrical shell 11 through a connecting ring 15. The inner filter screen 13 performs primary filtration on the mixed liquid, and the outer filter screen 14 performs secondary filtration on the mixed liquid. The annular space between the inner filter screen 13 and the outer filter screen 14 forms a secondary filter pressing cavity; the annular space between the outer filter screen 14 and the cylindrical shell 11 forms a liquid storage cavity; on the outer wall of the cylindrical shell 11 and near the upper surface of the connecting ring 15, a liquid extraction pump 17 is fixedly arranged. The liquid inlet of the liquid extraction pump 17 is communicated with the liquid storage cavity, and the liquid outlet of the liquid extraction pump 17 is communicated with an external pipeline to extract the filtered liquid. The housing assembly 1 further includes a liquid inlet pipe 16 extending into the conical discharge hopper 12 from the bottom opening. A pump body is arranged at the end of the liquid inlet pipe 16, and the pump body pumps the mixed liquid into the interior of the inner filter screen 13.

[0037] During the filter pressing operation, the bottom sealing assembly 4 seals both the bottom of the inner filter screen 13 and the bottom of the annular space between the inner filter screen 13 and the outer filter screen 14. When the filter pressing is completed, the bottom of the inner filter screen 13 and the bottom of the annular cavity are both opened to discharge the chemical products.

[0038] It should be noted that the diameter of the filter holes of the inner filter screen 13 is slightly larger than that of the outer filter screen 14, so that part of the mixed liquid can discharge from the filter holes of the inner filter screen 13 into the secondary filter pressing cavity for shunt filter pressing of the mixed liquid, reducing the filter pressure of the inner filter screen 13. The inner filter screen 13 is a dense metal mesh cylinder structure, and the outer filter screen 14 is composed of a rigid cylindrical skeleton and a filter cloth fixed on the cylindrical skeleton.

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

[0040] Please refer to Figure 1 and Figure 2 The pressing component 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 end of the cylinder 21 is fixedly connected to the lifting frame 22. An internal pressure filter element 23 is installed at the center of the lifting frame 22. The internal pressure filter element 23 includes a round tube 231 fixed to the bottom of the lifting frame 22 and sliding through the top of the cylindrical shell 11 and a pressure filter plate 232 arranged at the bottom of the round tube 231. The pressure filter plate 232 contacts the inner wall of the inner filter screen 13. During the process of the cylinder 21 contracting and driving the lifting frame 22 to move down, the pressure filter plate 232 squeezes the mixed liquid inside the inner filter screen 13.

[0041] Refer to Figure 2 and Figure 5 The internal pressure filter element 23 further includes a blanking assisting part. The blanking assisting part includes a motor 233 fixed to the top of the lifting frame 22, a rotating shaft 234 fixed to the output end of the motor 233, and a corrugated scraping plate 235 fixed to the bottom of the pressure filter plate 232. The rotating shaft 234 penetrates through the center of the round tube 231 and is fixedly connected to the pressure filter plate 232. The round tube 231 and the pressure filter plate 232 are rotatably connected. After the mixed liquid is pressure-filtered into a filter cake, in order to facilitate the discharge of the solid filter cake, it is necessary to disperse the filter cake. Specifically, the motor 233 drives the rotating shaft 234 to rotate, and then drives the corrugated scraping plate 235 to rotate through the pressure filter plate 232. The corrugated scraping plate 235 cuts and disperses the solid filter cake for discharge.

[0042] Please refer to Figure 2 and Figure 6 The pressing component 2 further includes an external pressure filter element 24 for pressure-filtering a small amount of mixed liquid in the secondary pressure filtration chamber. The external pressure filter element 24 includes a pressure filter ring 242 slidably installed up and down in the secondary pressure filtration chamber. The inner and outer ring surfaces of the pressure filter ring 242 contact the outer wall of the inner filter screen 13 and the inner wall of the outer filter screen 14 respectively. At least two fixing rods 241 distributed in a circumferential manner are fixedly connected to the upper end surface of the pressure filter ring 242. The fixing rods 241 slide through the top of the cylindrical shell 11 and are fixedly connected to the lifting frame 22. A plurality of circumferentially uniformly distributed triangular partition plates 243 are fixedly connected to the lower surface of the pressure filter ring 242.

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

[0044] It should be noted that when there are at least two outer filter meshes 14, the number of corresponding outer pressure filtration members 24 is the same as the number of outer filter meshes 14.

[0045] Please refer to Figure 2 、 Figure 7 and Figure 8 , the bottom cover assembly 4 includes a fixed bottom plate 41 at the lower end inside the cylindrical shell 11 and a lifting bottom ring 44 slidably sleeved outside the fixed bottom plate 41 up and down. The bottom end of the fixed bottom plate 41 is fixedly connected to the inner wall of the conical discharge hopper 12 through a plurality of support rods 42. The top end 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 penetrates the fixed bottom plate 41, and the pump body liquid outlet on the liquid inlet pipe 16 is communicated with the open 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 end of the lifting bottom ring 44 is fixed with a concentrically distributed guide ring 46 and a sealing ring 47. The guide ring 46 is located inside the sealing ring 47, and the gap between the two is the same as the wall thickness of the inner filter mesh 13. The inner ring surface of the guide ring 46 is sloped, and the distance between the inner and outer ring surfaces of the guide ring 46 gradually increases from top to bottom. When the lifting bottom ring 44 rises to the highest position, the upper surfaces of the lifting bottom ring 44 and the fixed bottom plate 41 are flush. At this time, the inner filter mesh 13 is inserted into the gap between the guide ring 46 and the sealing ring 47, and the bottom of the inner filter mesh 13 contacts the top of the lifting bottom ring 44. The bottom of the guide ring 46 and the bottom of the bamboo hat-shaped cover 43 are butted together to form a sunken area that gradually sinks from the center to the edge and from the edge to the center. When the mixed liquid is pumped by the pump body on the liquid inlet pipe 16 from the top of the bamboo hat-shaped cover 43 into the inner filter mesh 13, it will first flow along the outer wall of the bamboo hat-shaped cover 43 to the sunken area. When the liquid level in the sunken area gradually rises, the liquid level will first submerge the highest parts of the bamboo hat-shaped cover 43 and the guide ring 46 and gradually rise.

[0046] Please refer to 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 at the top of the sealing ring 47 gradually inclines upward from the edge to the center. When the inner filter mesh 13 is inserted into the gap between the guide ring 46 and the sealing ring 47, the top of the sealing ring 47 closes the bottom of the secondary pressure filtration chamber. When the pressure filtration ring 242 moves downward, the liquid will flow from the outer filter mesh 14 to the liquid storage chamber, 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 pressure filtration chamber is small, after the pressure filtration is completed, the residue in the secondary pressure filtration chamber is a semi-solid with poor fluidity, and may also be a compacted solid. When the lifting bottom ring 44 descends, the lifting bottom ring 44 drives the material guiding ring 46 and the plugging ring 47 to descend accordingly. At this time, the connection between the bamboo hat-shaped cover 43 and the material guiding ring 46 is separated, and the plugging ring 47 no longer plugs the secondary pressure filtration chamber. The semi-solid slides down along the slope. The arrangement of several triangular partition plates 243 cuts off the connection between the semi-solids, making it easier for the semi-solids to slide down.

[0048] It should be noted that when there are a tertiary pressure filtration chamber, a quaternary pressure filtration chamber, etc., the plugging ring 47 needs to seal the bottoms of the secondary pressure filtration chamber, the tertiary pressure filtration chamber, and the quaternary pressure filtration chamber.

[0049] Please refer to Figure 2 、 Figure 4 and Figure 5 After the pressure filtration of the mixed liquid inside the inner filter screen 13 is completed, a filter cake will be formed in the concave area. The filter cake is dispersed through the blanking auxiliary part, so that after the material guiding ring 46 moves downward, the dispersed filter cake can slide down along the surfaces of the bamboo hat-shaped cover 43 and the material guiding ring 46, and finally be discharged from the conical discharge hopper 12; A plurality of wavy scrapers 235 are arranged along the radial direction of the pressure filter plate 232, and the length of the wavy scraper 235 near the center of the pressure filter plate 232 is the smallest. The wavy scrapers 235 with different lengths are used to avoid the bamboo hat-shaped cover 43, and the special shape of the wavy scraper 235 increases its cutting range during rotation.

[0050] Please refer to Figure 1 、 Figure 9 、 Figure 10 and Figure 11 The pressure filtration mechanism further includes two symmetrically arranged locking members 45 for locking the lifting bottom ring 44. The locking member 45 includes a guiding through groove 452 opened at the lower end of the outer wall of the cylindrical shell 11. A guiding cover 451 with an upper opening and a lower closing is installed at the position of the outer wall of the cylindrical shell 11 corresponding to the guiding through groove 452. The longitudinal section of the guiding cover 451 is in an inverted L shape, and the vertical part of the guiding cover 451 is fixedly connected to the outer wall of the cylindrical shell 11. A lifting block 453 that slides up and down along the guiding through groove 452 is fixedly installed at the lower end of the lifting bottom ring 44. A rectangular groove 454 is opened at one end of the lifting block 453 away from the axis of the lifting bottom ring 44, and a horizontally sliding cross-moving block 456 is connected in the rectangular groove 454 through a spring 455. The cross-moving block 456 can slide along the vertical part of the guiding cover 451 and can also be lapped on the horizontal part of the guiding cover 451 to lock the positions of the lifting block 453 and the lifting bottom ring 44.

[0051] Please refer to Figure 10 、 Figure 11 and Figure 12, the locking member 45 further includes an unlocking portion for releasing the locking of the lifting block 453 by the transverse movement block 456. The unlocking portion includes a wedge-shaped groove 457 formed on the upper surface of the transverse 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 inclines downward in a direction away from the axis of the lifting bottom ring 44. A pressing rod 458 is fixedly installed at the corresponding position of the top end of the lifting frame 22 with respect to the wedge-shaped groove 457, and the bottom end of the 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, it drives the pressing rod 458 to move downward accordingly. When the inclined surface at the bottom end of the pressing rod 458 abuts against the inclined surface of the wedge-shaped groove 457, it will push the transverse movement block 456 to move into the interior of the rectangular groove 454. At this time, the spring 455 is gradually compressed, and the transverse movement block 456 no longer overlaps with the horizontal portion of the guiding cover 451. When the lifting frame 22 continues to move downward, since the transverse movement 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 pushing action of the pressing rod 458. The bottom of the inner filter screen 13 and the bottom of the secondary pressure filtration chamber are no longer blocked. When the lifting block 453 slides to the lowest position of the guiding through groove 452, the lifting frame 22 stops moving downward.

[0052] When the lifting frame 22 rises, in order to enable the pressing rod 458 to drive the transverse 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 end of the inner wall of the wedge-shaped groove 457. A locking groove 459 is formed on the side of the pressing rod 458 away from the axis of the lifting bottom ring 44 and is in plug-in cooperation with the protrusion. During the downward movement of the pressing rod 458, the inclined surface at the bottom end of the pressing rod 458 pushes the transverse movement block 456 into the rectangular groove 454. The protrusion in the wedge-shaped groove 457 is inserted into the locking groove 459 on the pressing rod 458 during the lateral movement. When the pressing rod 458 rises, the locking groove 459 can drive the protrusion to move upward, thereby driving the transverse movement block 456, the lifting block 453, and the lifting bottom ring 44 to move upward synchronously. When the transverse movement block 456 moves to the horizontal portion of the guiding cover 451, the transverse movement block 456 is pushed out of the rectangular groove 454 by the spring 455 and overlaps with the horizontal portion of the guiding cover 451. Thus, the lifting bottom ring 44 is level with the fixed bottom plate 41 again, and the bottom of the inner filter screen 13 and the bottom of the secondary pressure filtration 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 clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0058] In the description of the present invention, it should also be noted that, unless otherwise clearly specified or limited, the terms "arranged", "connected", "installed" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, an integral connection or a sliding connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0059] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A filter pressing mechanism for a chemical filter press, characterized in that: It includes a housing assembly, which includes a cylindrical shell, a conical discharge hopper fixed at the bottom of the cylindrical shell, 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 through a connecting ring to form a liquid storage cavity, and the liquid in the liquid storage cavity is pumped out by a liquid extraction pump; the annular space between the inner filter screen and the outer filter screen forms a secondary pressure filtration cavity, and the housing assembly further includes a liquid inlet pipe for conveying the mixed liquid into the inner filter screen. The pressure filtration mechanism further includes a downward pressing assembly and a bottom sealing assembly arranged inside the cylindrical shell. The downward pressing assembly includes a lifting frame arranged above the cylindrical shell, an inner pressure filtration member and an outer pressure filtration member arranged on the lifting frame. The bottom sealing assembly includes a fixed bottom plate at the lower end inside the cylindrical shell, and a lifting bottom ring slidably sleeved outside the fixed bottom plate. The outer diameter of the lifting bottom ring is smaller than the inner diameter of the cylindrical shell. Initially, the bottom of both the inner filter screen and the secondary pressure filtration cavity is closed. When the lifting frame moves downward, pressure filtration operation is first performed, and then the bottom sealing assembly is driven to contact and block the inner filter screen and the secondary pressure filtration cavity. When the lifting frame moves upward and resets, the bottom sealing assembly is driven to close the bottom of the inner filter screen and the secondary pressure filtration cavity again.

2. The pressure filtration mechanism for a chemical filter press according to claim 1, wherein: The height of the inner filter screen is higher than that of the outer filter screen, and only the upper half of the inner filter screen is provided with filter holes. The diameter of the filter holes of the inner filter screen is larger than that of the outer filter screen.

3. The filter press mechanism for a chemical filter press according to claim 1, characterized in that: The inner pressure filtration member includes a round tube fixed at the bottom of the lifting frame and slidably penetrating through the top of the cylindrical shell, and a pressure filtration plate arranged at the bottom of the round tube. The pressure filtration plate contacts the inner wall of the inner filter screen.

4. The pressure filtration mechanism for a chemical filter press according to claim 3, characterized in that: The inner pressure filtration member further includes a blanking auxiliary part. The blanking auxiliary part includes a motor fixed at the top of the lifting frame, a rotating shaft fixed at the output end of the motor, and a corrugated scraper fixed at the bottom of the pressure filtration plate. The rotating shaft penetrates through the center of the round tube and is fixedly connected to the pressure filtration plate, and the round tube and the pressure filtration plate are rotatably connected.

5. The pressure filtration mechanism for a chemical filter press according to claim 1, characterized in that: The outer pressure filtration member includes a pressure filtration ring slidably installed up and down in the secondary pressure filtration cavity. The inner and outer ring surfaces of the pressure filtration ring respectively contact the outer wall of the inner filter screen and the inner wall of the outer filter screen. A plurality of circumferentially uniformly distributed triangular partitions are fixedly connected to the lower surface of the pressure filtration ring, and at least two fixing rods distributed in a circle are fixedly connected to the upper end surface of the pressure filtration ring. The fixing rods slide through the top of the cylindrical shell and are fixedly connected to the lifting frame.

6. The pressure filtration mechanism for a chemical filter press according to claim 1, characterized in that: The bottom sealing assembly further includes a bamboo hat-shaped cover with an open top fixedly installed on the upper surface of the fixed bottom plate, a guide ring and a sealing ring fixedly installed on the upper surface of the lifting bottom ring and distributed concentrically. 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 bamboo hat-shaped cover and the guide ring jointly block the bottom of the inner filter screen, and the sealing ring blocks the bottom of the secondary pressure filtration cavity. 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 penetrates through the fixed bottom plate, and the liquid outlet of the pump body on the liquid inlet pipe is communicated with the open top of the bamboo hat-shaped cover.

7. The pressure filtration mechanism for a chemical filter press according to claim 6, characterized in that: The inner ring surface of the guide ring is sloped, and the distance between the inner and outer ring surfaces of the guide ring gradually increases from top to bottom. The bottom of the guide ring and the bottom of the bamboo hat-shaped cover are butted together to form a sunken area that gradually sinks from the center to the edge and from the edge to the center.

8. A pressure filtration mechanism for a chemical filter press according to claim 1, characterized in that: The pressure filtration mechanism further includes two locking members that are symmetrically arranged and used to lock the lifting bottom ring. The locking member includes a guiding through groove opened at the lower end of the outer wall of the cylindrical shell. A guiding cover with an upper opening and a lower closing is fixedly installed on the outer wall of the cylindrical shell corresponding to the guiding through groove. The longitudinal section of the guiding cover is in an inverted L shape. A lifting block that slides up and down along the guiding through groove is fixedly installed at the lower end of the lifting bottom ring. A rectangular groove is opened at one end of the lifting block away from the axis of the lifting bottom ring, and a laterally sliding cross-moving block is elastically connected in the rectangular groove. During the opening process of the bottom of the inner filter screen and the bottom of the secondary pressure filtration chamber, the cross-moving block slides along the vertical part of the guiding cover. During the blocking process of the bottom of the inner filter screen and the bottom of the secondary pressure filtration chamber, the cross-moving block is lapped on the horizontal part of the guiding cover.

9. The pressure filtration mechanism for a chemical filter press according to claim 8, wherein: The locking member further includes an unlocking portion for releasing the locking of the cross-moving block on the lifting block. The unlocking portion includes a wedge-shaped groove opened on the upper surface of the cross-moving block. The inclined surface of the wedge-shaped groove faces the center of the lifting bottom ring, and the wedge-shaped groove gradually inclines towards the side away from the axis of the lifting bottom ring from top to bottom. A pressing rod is fixedly installed at the top of the lifting frame corresponding to the guiding cover, and the bottom end of the pressing rod is an inclined surface that cooperates with the inclined surface of the wedge-shaped groove. A protrusion is integrally formed on the inner wall of the wedge-shaped groove, and the protrusion is located at the top of the inner wall of the wedge-shaped groove. A locking groove that is inserted and matched with the protrusion is opened on the side of the pressing rod away from the axis of the lifting bottom ring.

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