Discharge auxiliary device of plate-and-frame filter press

Abstract

The application relates to the technical field of plate-and-frame filter presses, in particular to a discharging auxiliary device of a plate-and-frame filter press, which comprises first filter plates and second filter plates, filter chambers are arranged on the front and back surfaces of the first filter plates and the second filter plates, liquid holes are arranged near the four corners of the first filter plates and the second filter plates, a material port is arranged through the center of the filter chambers, contraction grooves are arranged on the inner walls of the filter chambers near the two sides, driving grooves are arranged on the inner walls of the contraction grooves, an ejection mechanism is arranged in the driving grooves and the contraction grooves, air pipes are fixedly arranged through the two sides of the first filter plates and the second filter plates, the ejection mechanism can make the filter cloth in the filter chambers move, the filter cloth is bulged outward, the filter cloth is reversely deformed, the filter cake on the filter cloth is more easily separated from the filter cloth when the first filter plates and the second filter plates are separated, the filter cake is prevented from being adsorbed on the filter cloth, and the discharging efficiency and quality are improved.

Description

Technical Field

[0001] This invention relates to the field of plate and frame filter press technology, specifically to a discharge auxiliary device for a plate and frame filter press. Background Technology

[0002] Plate and frame filter presses are widely used solid-liquid separation equipment in industries such as chemical, pharmaceutical, food, and environmental protection. Their working principle is to use a hydraulic system to push the filter plates to fit tightly together to form a filter chamber. The suspension containing solid particles is introduced into the filter chamber. Under pressure, the liquid passes through the filter cloth and is discharged, while the solid particles are trapped in the filter chamber to form a filter cake, thereby achieving solid-liquid separation.

[0003] In traditional plate and frame filter press operation, after the suspension is filtered, the filter plates are pulled apart one by one by a trolley to allow the filter cake to detach from the filter cloth. However, in actual operation, the filter cake is difficult to detach from the filter cloth for the following reasons: First, during filtration, solid particles form a dense filter cake layer on the surface of the filter cloth, resulting in physical adsorption between the filter cake and the filter cloth. Second, the liquid in the suspension forms a liquid film on the surface of the filter cloth, which enhances the adhesion between the filter cake and the filter cloth. Third, during filtration, the filter cloth is deformed to a certain extent under pressure, tightly adhering to the filter cake, further increasing the difficulty of detaching the filter cake. These factors result in a strong adsorption force between the filter cake and the filter cloth, making it difficult for the filter cake to detach smoothly. This leaves a significant amount of filter cake remaining on the filter cloth surface, which not only reduces the feeding efficiency and increases production time costs, but also affects the normal operation of subsequent filtration processes, reducing filtration efficiency and product quality. Therefore, we propose a discharge auxiliary device for plate and frame filter presses. Summary of the Invention

[0004] The purpose of this invention is to provide a discharge auxiliary device for a plate and frame filter press to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a discharge auxiliary device for a plate and frame filter press, comprising a first filter plate and a second filter plate, wherein filter chambers are provided on the front and back sides of the first and second filter plates, and liquid holes are provided near the four corners of the first and second filter plates. A material outlet is provided through the center of each filter chamber. A shrinkage groove is provided near both sides of the inner wall of the filter chamber, and a drive groove is provided on the inner wall of the shrinkage groove. An ejection mechanism is provided in the drive groove and the shrinkage groove. A vent pipe is fixedly passed through both sides of the first and second filter plates, and the vent pipe extends into the drive groove. A piston box one and a piston box two are movably sleeved on the outer wall of the vent pipe on the same side of the first and second filter plates, respectively. A connecting mechanism is provided between the piston box one and the piston box two.

[0006] Preferably, the ejection mechanism includes a piston cylinder, a top box one, and a top box two. The top box two is fixedly installed on the front of the top box one. The piston cylinder is fixedly installed on the inner wall of the drive groove. The vent pipe is connected to the piston cylinder. A connecting rod is movably inserted through both the bottom and top ends of the piston cylinder. A piston plate one is fixedly installed at one end of the connecting rod. The piston plate one is slidably connected to the inner wall of the piston cylinder. A hinge seat one is fixedly installed at the other end of the connecting rod. Two hinge seats two are fixedly installed on the back of the top box one. A hinge plate is hinged between the hinge seats one and the two hinge seats two at the other ends of the two connecting rods. A spring one is fixedly installed between the bottom end of the piston plate one and the bottom end of the inner wall of the piston cylinder. The spring one surrounds the outer wall of the connecting rod. A piston plate two is fixedly installed at the other end of the vent pipe. The piston plate two is slidably connected to the inner wall of the piston box one. The vent pipe is connected to the vent hole opened on the piston plate two. By setting the spring one, the piston plate one can be reset and moved under the reset force of the spring one when the piston plate one is not under force.

[0007] Preferably, a sealing frame plate is fixedly installed on the back of the top box, and a sealing groove is provided on the inner wall of the shrinkage groove. The sealing frame plate is inserted into the sealing groove, and a sealing ring is fixedly installed on the inner wall of the sealing groove. The sealing ring is tightly fitted to the back of the sealing frame plate. By setting the sealing frame plate, the sealing groove, and the sealing ring, the sealing performance between the top box and the shrinkage groove can be increased.

[0008] Preferably, limiting grooves are provided on both sides of the drive groove, the limiting grooves are opened inside the first filter plate, and a blowing mechanism is provided between the limiting grooves and the top box one and the top box two.

[0009] Preferably, the blowing mechanism includes a limiting plate one and a piston plate three. The limiting plate one is slidably connected to the inner wall of the limiting groove. A limiting sleeve plate is fixedly installed on the front of the limiting plate one. The limiting sleeve plate movably passes through the inner wall of the limiting groove and the back of the top box one. A limiting plate two is slidably connected to the inner wall of the limiting sleeve plate. A connecting plate is fixedly installed on the front of the limiting plate two. The connecting plate movably passes through the front of the limiting sleeve plate. The piston plate three is slidably connected to the inner wall of the top box one. The connecting plate is fixedly installed on the back of the piston plate three. An air jet pipe is fixedly passed through the front of the piston plate three. The air jet pipe movably passes through the front of the top box one and the back of the top box two. An air jet hole is opened on the front of the top box two. By setting the air jet hole, the gas ejected from the air jet pipe can be ejected onto the filter cloth through the air jet hole.

[0010] Preferably, the connecting mechanism includes a first fixing plate, a second fixing plate, and a U-shaped clamping plate. The first fixing plate and the second fixing plate are respectively fixedly installed on the outer walls of the first piston box and the second piston box. Each of the first fixing plate and the second fixing plate has a first clamping groove on its opposite side. The U-shaped clamping plate is clamped in the first clamping groove. Each of the outer walls of the first piston box and the second piston box is slidably connected to a clamping frame. The outer wall of the U-shaped clamping plate has a second clamping groove. The clamping frame is clamped in the second clamping groove. By setting the U-shaped clamping plate, the U-shaped clamping plate can be clamped into the first clamping groove, thereby limiting and fixing the first fixing plate and the second fixing plate. By setting the clamping frame, the clamping frame can be inserted into the second clamping groove, thereby limiting and fixing the U-shaped clamping plate.

[0011] Preferably, a limiting slider is fixedly installed on one side of the card frame, and limiting grooves are formed on the outer walls of both piston box one and piston box two. The limiting slider is slidably connected to the limiting groove, and a limiting rod is fixedly installed on the inner wall of the limiting groove. The limiting rod movably passes through the limiting slider, and a spring two is surrounded on the outer wall of the limiting rod. The spring two is fixedly installed between the front of the limiting slider and the inner wall of the limiting groove. By setting the limiting rod, the limiting rod can limit the limiting slider and the spring two, ensuring the stability of the limiting slider when sliding and the spring two when compressed.

[0012] Preferably, a fastening bolt is threaded into the threaded hole on the card frame, and positioning grooves are provided on the outer walls of both piston box one and piston box two. The fastening bolt is inserted into the positioning groove. By setting the fastening bolt, the fastening bolt can be inserted into the positioning groove, thereby limiting and fixing the card frame and improving the stability of the card frame in use.

[0013] Preferably, a sealing frame groove 2 is provided at the opposite ends of piston box 1 and piston box 2. A sealing frame plate 2 and a sealing ring 2 are fixedly installed at the opposite ends of piston box 2 and piston box 1. The sealing frame plate 2 is inserted into the sealing frame groove 2, and the sealing ring 2 is tightly fitted to one end of piston box 1. By setting the sealing frame plate 2, the sealing frame groove 2, and the sealing ring 2, the sealing performance between piston box 1 and piston box 2 can be improved.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up the ejection mechanism, the filter cloth in the filter chamber can be pushed by the top box, causing the filter cloth to bulge outward and deform in the opposite direction. This makes it easier for the filter cake on the filter cloth to detach from the filter cloth when the first filter plate and the second filter plate are separated, thus avoiding the filter cake adhering to the filter cloth and improving the feeding efficiency and quality.

[0015] 2. By setting up a blowing mechanism, the top box can generate an outward airflow on the filter cloth while pushing it outward. This airflow can further act on the filter cake on the filter cloth, creating gaps in the filter cake and making it easier for the filter cake to detach from the filter cloth. This reduces the residue of the filter cake on the filter cloth and further improves the feeding quality.

[0016] 3. By setting up a connecting mechanism, it is easy to disassemble piston box one and piston box two, thereby enabling maintenance operations on the first filter plate and the second filter plate, reducing maintenance difficulty, and ensuring the normal use of the first filter plate and the second filter plate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the top of the first filter plate of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram of section A in the middle; Figure 4 For the present invention Figure 2 Enlarged structural diagram of section B; Figure 5 For the present invention Figure 2 Enlarged structural diagram of section C; Figure 6 This is a schematic diagram of the top cross-section of the back structure of the top box of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of section D in the middle; Figure 8 This is a schematic cross-sectional view of the first filter plate of the present invention. Figure 9 For the present invention Figure 8 Enlarged structural diagram of section E in the middle; Figure 10 For the present invention Figure 8 Enlarged structural diagram of section F in the middle; Figure 11 This is a schematic diagram of the front cross-sectional structure of the card frame of the present invention; Figure 12 For the present invention Figure 11 Enlarged structural diagram of the middle G section.

[0018] The components represented by each number in the attached diagram are listed below: 1. First filter plate; 2. Second filter plate; 3. Filter chamber; 4. Feed inlet; 5. Liquid hole; 6. Drive groove; 7. Piston cylinder; 8. Vent pipe; 9. Piston plate one; 10. Connecting rod; 11. Spring one; 12. Hinge seat one; 13. Hinge plate; 14. Hinge seat two; 15. Top box one; 16. Top box two; 17. Shrinkage groove; 18. Sealing frame plate one; 19. Sealing ring one; 20. Sealing frame groove one; 21. Limiting groove; 22. Limiting plate one; 23. Limiting sleeve 24. Limiting plate two; 25. Connecting plate; 26. Piston plate two; 27. Jet pipe; 28. Jet hole; 29. ​​Piston plate three; 30. Piston box one; 31. Piston box two; 32. Sealing ring two; 33. Sealing frame plate two; 34. Sealing frame groove two; 35. Fixing plate one; 36. Fixing plate two; 37. Slot one; 38. U-shaped clamping plate; 39. Clamping frame; 40. Slot two; 41. Limiting slider; 42. Limiting slide groove; 43. Limiting rod; 44. Spring two; 45. Fastening bolt; 46. Positioning groove. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a technical solution: such as Figures 1-12 The discharge auxiliary device of a plate and frame filter press shown includes a first filter plate 1 and a second filter plate 2. Filter chambers 3 are provided on the front and back of the first filter plate 1 and the second filter plate 2, and liquid holes 5 are provided near the four corners of the first filter plate 1 and the second filter plate 2. A material port 4 is provided through the center of the filter chamber 3. Shrinkage grooves 17 are provided on the inner wall of the filter chamber 3 near the two sides. Drive grooves 6 are provided on the inner wall of the shrinkage grooves 17. An ejection mechanism is provided in the drive grooves 6 and the shrinkage grooves 17. Air pipes 8 are fixedly passed through both sides of the first filter plate 1 and the second filter plate 2 and extend into the drive grooves 6. Piston boxes 1 and 2 are movably sleeved on the outer wall of the air pipes 8 on the same side of the first filter plate 1 and the second filter plate 2, respectively. A connecting mechanism is provided between the piston boxes 1 and 2.

[0021] The ejection mechanism includes a piston cylinder 7, a first ejector box 15, and a second ejector box 16. The second ejector box 16 is fixedly installed on the front of the first ejector box 15. The piston cylinder 7 is fixedly installed on the inner wall of the drive groove 6. A vent pipe 8 is connected to the piston cylinder 7. A connecting rod 10 is movably inserted through both the bottom and top ends of the piston cylinder 7. A piston plate 9 is fixedly installed at one end of the connecting rod 10 and is slidably connected to the inner wall of the piston cylinder 7. A hinge seat 12 is fixedly installed at the other end of the connecting rod 10. The back of the first ejector box 15 is fixedly installed with... There are two hinge seats 14. The hinge seats 12 on the other end of the two connecting rods 10 are hinged to the two hinge seats 14 with hinge plates 13. A spring 11 is fixedly installed between the bottom end of the piston plate 9 and the bottom end of the inner wall of the piston cylinder 7. The spring 11 surrounds the outer wall of the connecting rod 10. A piston plate 26 is fixedly installed at the other end of the vent pipe 8. The piston plate 26 is slidably connected to the inner wall of the piston box 30, and the vent pipe 8 is connected to the vent hole opened on the piston plate 26. By setting a spring 11, the piston plate 9 can be reset and moved when the piston plate 9 is not under the reset force of the spring 11. Support plates are installed between the piston plate 9 and the connecting rod 10, and between the piston plate 26 and the vent pipe 8. The two support plates are the same as the piston plate 9 and the piston plate 26 respectively, and are used to support the piston plate 9 and the piston plate 26 to prevent them from deforming when pulled.

[0022] A sealing frame plate 18 is fixedly installed on the back of the top box 15. A sealing frame groove 20 is opened on the inner wall of the shrinkage groove 17. The sealing frame plate 18 is inserted into the sealing frame groove 20. A sealing ring 19 is fixedly installed on the inner wall of the sealing frame groove 20. The sealing ring 19 is tightly fitted to the back of the sealing frame plate 18. By setting a sealing frame plate 18, a sealing frame groove 20, and a sealing ring 19, the sealing frame plate 18, the sealing frame groove 20, and the sealing ring 19 can increase the sealing performance between the top box 15 and the shrinkage groove 17.

[0023] Limiting grooves 21 are provided on both sides of the drive groove 6. The limiting grooves 21 are opened inside the first filter plate 1. A blowing mechanism is provided between the limiting grooves 21 and the top box 15 and the top box 2 16.

[0024] The blowing mechanism includes a limiting plate 22 and a piston plate 29. The limiting plate 22 is slidably connected to the inner wall of the limiting groove 21. A limiting sleeve 23 is fixedly installed on the front of the limiting plate 22. The limiting sleeve 23 movably passes through the inner wall of the limiting groove 21 and the back of the top box 15. A limiting plate 24 is slidably connected to the inner wall of the limiting sleeve 23. A connecting plate 25 is fixedly installed on the front of the limiting plate 24. The connecting plate 25 movably passes through the front of the limiting sleeve 23. The piston plate 29 is slidably connected to the inner wall of the top box 15. The connecting plate 25 is fixedly installed on the back of the piston plate 29. An air jet pipe 27 is fixedly passed through the front of the piston plate 29. The air jet pipe 27 movably passes through the front of the top box 15 and the back of the top box 26. An air jet hole 28 is opened on the front of the top box 26. Among them, by setting the jet hole 28, the gas ejected from the jet pipe 27 can be ejected onto the filter cloth through the jet hole 28. A support plate is also installed between the piston plate 29 and the connecting plate 25, which also supports the piston plate 29, prevents the piston plate 29 from deforming, and ensures the normal use effect of the piston plate 29.

[0025] The number of jet pipes 27 can be determined according to the specifications of piston plate 29 to ensure the uniformity of air output from jet holes 28 in top box 2 16.

[0026] The connecting mechanism includes a first fixing plate 35, a second fixing plate 36, and a U-shaped clamping plate 38. The first fixing plate 35 and the second fixing plate 36 are respectively fixedly installed on the outer walls of the first piston box 30 and the second piston box 31. The first fixing plate 35 and the second fixing plate 36 are provided with a first clamping groove 37 on opposite sides. The U-shaped clamping plate 38 is clamped in the first clamping groove 37. The outer walls of the first piston box 30 and the second piston box 31 are slidably connected with a clamping frame 39. The outer wall of the U-shaped clamping plate 38 is provided with a second clamping groove 40. The clamping frame 39 is clamped in the second clamping groove 40. By setting the U-shaped clamping plate 38, the U-shaped clamping plate 38 can be clamped into the first clamping groove 37, thereby limiting and fixing the first fixing plate 35 and the second fixing plate 36. Specifically, by setting the card frame 39, the card frame 39 can be inserted into the card slot 40, thereby limiting and fixing the U-shaped card plate 38.

[0027] A limiting slider 41 is fixedly installed on one side of the card frame 39. Limiting grooves 42 are opened on the outer walls of piston box 1 30 and piston box 2 31. The limiting slider 41 is slidably connected to the limiting groove 42. A limiting rod 43 is fixedly installed on the inner wall of the limiting groove 42. The limiting rod 43 moves through the limiting slider 41. A spring 2 44 is surrounded on the outer wall of the limiting rod 43. The spring 2 44 is fixedly installed between the front of the limiting slider 41 and the inner wall of the limiting groove 42. By setting a limiting rod 43, the limiting rod 43 can limit the limiting slider 41 and the second spring 44, ensuring the stability of the limiting slider 41 when sliding and the second spring 44 when compressed.

[0028] A fastening bolt 45 is threaded into the threaded hole on the card frame 39. Positioning grooves 46 are provided on the outer walls of piston box 1 30 and piston box 2 31, and the fastening bolt 45 is inserted into the positioning grooves 46. By setting fastening bolts 45, which can be inserted into positioning grooves 46, the clamping frame 39 can be limited and fixed, thereby improving the stability of the clamping frame 39 in use.

[0029] A sealing frame groove 24 is provided at the opposite ends of piston box 1 30 and piston box 2 31. A sealing frame plate 233 and a sealing ring 22 are fixedly installed at the opposite ends of piston box 2 31 and piston box 1 30. The sealing frame plate 233 is inserted into the sealing frame groove 24, and the sealing ring 232 is tightly fitted to one end of piston box 1 30. By setting up a second sealing frame plate 33, a second sealing frame groove 34, and a second sealing ring 32, the connection between the second sealing frame plate 33, the first piston box 30, and the second piston box 31 can be effectively sealed through the second sealing frame plate 33, the second sealing frame groove 34, and the second sealing ring 32. The vent pipe 8 is located at one end of the piston cylinder 7 between the two piston plates 9 inside the piston cylinder 7. A sealed space has been formed between the two piston plates 9, so an effective negative pressure can be formed in the piston cylinder 7.

[0030] Working principle: In use, filter cloths are first installed in the filter chambers 3 of the first filter plate 1 and the second filter plate 2. Then, the hydraulic pushing system on the filter press makes the first filter plate 1 and the second filter plate 2 fit tightly together. Next, the wastewater suspension is introduced through the feed inlet 4, filling the filter chamber 3. After filtration by the filter cloths, a filter cake of residue forms between the filter cloths of the first filter plate 1 and the second filter plate 2. After the suspension filtration is complete, the first filter plate 1 and the second filter plate 2 are pulled apart one by one by the pulling trolley on the filter press. During the separation of filter plate 1 and filter plate 2, filter plate 1 and filter plate 2 respectively drive piston plates 26 in piston box 30 and piston box 31 to move in opposite directions through their respective air pipes 8. When the two filter plates separate, the two air pipes 8 will move away from each other. At this time, the two air pipes 8 will pull the piston plates 26 connected to them away from each other. Even if piston box 30 and piston box 31 follow one of the air pipes 8 first, in the end, piston box 30 and piston box 31 will also be on one of the piston plates 26. Pulled by 6, the other piston plate 26 draws air from piston box 30 and piston box 31, thus completing the intake work. This reduces the air pressure between the two piston plates 26. At this time, piston box 30 and piston box 31 draw air from piston cylinder 7 through the vent holes and vent pipe 8 in piston plate 26. This causes the air pressure near the center of piston cylinder 7 to decrease, causing the two piston plates 9 in piston cylinder 7 to move closer to each other. Piston plate 9 moves the hinge seat 12 towards piston cylinder 7 via connecting rod 10. The hinge seat 12 drives the hinge plate 13 to rotate, causing the hinge plate 13 to slowly move closer to the straightened state. The hinge plate 13 drives the top box 15 to move out of the shrinkage groove 17 through the hinge seat 2 14, causing the top box 15 to drive the top box 2 16 to move out of the shrinkage groove 17. The top box 2 16 pushes the filter cloth in the filter chamber 3, causing the filter cloth to bulge outward and produce reverse deformation. This makes it easier for the filter cake on the filter cloth to detach from the filter cloth when the first filter plate 1 and the second filter plate 2 are separated, avoiding the filter cake from adhering to the filter cloth and improving the feeding efficiency and quality.When the top box 15 moves outward from the shrinkage groove 17, it drives the piston plate 26 to move. The piston plate 26 drives the connecting plate 25 to move outward from the limiting sleeve 23. The connecting plate 25 drives the limiting plate 24 to slide within the limiting sleeve 23. When the limiting plate 24 moves to contact the front end of the limiting sleeve 23, it pulls the limiting sleeve 23 outward from the limiting groove 21. The limiting sleeve 23 drives the limiting plate 22 to slide within the limiting groove 21. When the limiting plate 22 moves to contact the front end of the limiting groove 21... At this time, the connecting plate 25 will pull the piston plate 26 towards the rear of the top box 15 under the reaction force, causing the piston plate 26 to compress the air in the top box 15. The compressed air is then blown into the top box 16 through the jet pipe 27 and finally ejected through the jet hole 28. This causes the top box 16 to push the filter cloth outward while generating an outward airflow on the filter cloth. This airflow can further act on the filter cake on the filter cloth, creating gaps in the filter cake and making it easier for the filter cake to detach from the filter cloth. This reduces filter cake residue on the filter cloth, further improving the feeding quality. When personnel need to disassemble and maintain the first and second filter cakes, they can directly pull the retaining frame 39 on piston box 1 30 and piston box 2 31. This causes the retaining frame 39 to drive the limiting slider 41 to compress the spring 2 44, disengaging the retaining frame 39 from the retaining groove 2 40. This removes the retaining frame 39 from limiting the U-shaped retaining plate 38, allowing it to disengage from the retaining groove 1 37 and stop restricting the fixing plate 1 35 and fixing plate 2 38. The piston box 30 is positioned between points 36 and 31. Pulling either the first filter plate 1 or the second filter plate 2 at this point will disengage the piston box 30 and piston box 31, thus completing the disassembly of the first filter plate 1 and the second filter plate 2. This structure facilitates the disassembly of the piston box 30 and piston box 31, making maintenance of the first filter plate 1 and the second filter plate 2 easier, significantly reducing maintenance difficulty, improving work efficiency, and ensuring the normal use of the first filter plate 1 and the second filter plate 2.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A discharge auxiliary device for a plate and frame filter press, comprising a first filter plate (1) and a second filter plate (2), wherein filter chambers (3) are provided on the front and back sides of both the first filter plate (1) and the second filter plate (2), and liquid holes (5) are provided near the four corners of both the first filter plate (1) and the second filter plate (2), and a feed inlet (4) is provided through the center of each filter chamber (3), characterized in that: The filter chamber (3) has a shrinkage groove (17) on its inner wall near both sides. The shrinkage groove (17) has a drive groove (6) on its inner wall. The drive groove (6) and the shrinkage groove (17) are provided with an ejection mechanism. The first filter plate (1) and the second filter plate (2) are both fixedly connected by a ventilation pipe (8), and the ventilation pipe (8) extends into the drive groove (6). The outer wall of the ventilation pipe (8) on the same side of the first filter plate (1) and the second filter plate (2) is respectively movably fitted with a piston box one (30) and a piston box two (31). A connecting mechanism is provided between the piston box one (30) and the piston box two (31). The ejection mechanism includes a piston cylinder (7), a first top box (15), and a second top box (16). The second top box (16) is fixedly installed on the front of the first top box (15). The piston cylinder (7) is fixedly installed on the inner wall of the drive groove (6). The vent pipe (8) is connected to the piston cylinder (7). A connecting rod (10) is movably inserted through both the bottom and top ends of the piston cylinder (7). A piston plate (9) is fixedly installed at one end of the connecting rod (10). The piston plate (9) is slidably connected to the inner wall of the piston cylinder (7). A hinge seat (12) is fixedly installed at the other end of the connecting rod (10). The back of the first top box (15) is... Two hinge seats (14) are fixedly installed on the surface. Hinges (12) on the other end of the two connecting rods (10) are hinged to the two hinge seats (14) with hinge plates (13). A spring (11) is fixedly installed between the bottom end of the piston plate (9) and the bottom end of the inner wall of the piston cylinder (7). The spring (11) surrounds the outer wall of the connecting rod (10). A piston plate (29) is fixedly installed at the other end of the vent pipe (8). The piston plate (29) is slidably connected to the inner wall of the piston box (30), and the vent pipe (8) is connected to the vent hole opened on the piston plate (29). When the two filter plates separate, the two vent pipes (8) will move away from each other, and the two vent pipes (8) will pull the piston plate three (29) connected to them away from each other, so that the air pressure between the two piston plates three (29) decreases. The piston box one (30) and piston box two (31) draw air from the piston cylinder (7) through the vent hole in the piston plate three (29) and the vent pipe (8), so that the air pressure near the center of the piston cylinder (7) decreases, so that the two piston plates one (9) in the piston cylinder (7) move closer to each other.

2. The discharge auxiliary device for a plate and frame filter press according to claim 1, characterized in that: A sealing frame plate (18) is fixedly installed on the back of the top box (15). A sealing frame groove (20) is opened on the inner wall of the shrinkage groove (17). The sealing frame plate (18) is inserted into the sealing frame groove (20). A sealing ring (19) is fixedly installed on the inner wall of the sealing frame groove (20). The sealing ring (19) is tightly fitted to the back of the sealing frame plate (18).

3. The discharge auxiliary device for a plate and frame filter press according to claim 1, characterized in that: Limiting grooves (21) are provided on both sides of the drive groove (6). The limiting grooves (21) are opened inside the first filter plate (1). A blowing mechanism is provided between the limiting grooves (21) and the top box one (15) and the top box two (16).

4. The discharge auxiliary device for a plate and frame filter press according to claim 3, characterized in that: The blowing mechanism includes a limiting plate one (22) and a piston plate two (26). The limiting plate one (22) is slidably connected to the inner wall of the limiting groove (21). A limiting sleeve plate (23) is fixedly installed on the front of the limiting plate one (22). The limiting sleeve plate (23) movably passes through the inner wall of the limiting groove (21) and the back of the top box one (15). A limiting plate two (24) is slidably connected to the inner wall of the limiting sleeve plate (23). A connecting plate is fixedly installed on the front of the limiting plate two (24). (25) The connecting plate (25) is movably connected through the front of the limiting sleeve plate (23). The piston plate two (26) is slidably connected to the inner wall of the top box one (15). The connecting plate (25) is fixedly installed on the back of the piston plate two (26). The front of the piston plate two (26) is fixedly connected with the jet pipe (27). The jet pipe (27) is movably connected through the front of the top box one (15) and the back of the top box two (16). The front of the top box two (16) is provided with a jet hole (28).

5. The discharge auxiliary device for a plate and frame filter press according to claim 1, characterized in that: The connecting mechanism includes a first fixing plate (35), a second fixing plate (36), and a U-shaped clamping plate (38). The first fixing plate (35) and the second fixing plate (36) are respectively fixedly installed on the outer walls of the first piston box (30) and the second piston box (31). The first fixing plate (35) and the second fixing plate (36) are provided with a first clamping groove (37) on opposite sides. The U-shaped clamping plate (38) is clamped in the first clamping groove (37). The outer walls of the first piston box (30) and the second piston box (31) are slidably connected with a clamping frame (39). The outer wall of the U-shaped clamping plate (38) is provided with a second clamping groove (40). The clamping frame (39) is clamped in the second clamping groove (40).

6. The discharge auxiliary device for a plate and frame filter press according to claim 5, characterized in that: A limiting slider (41) is fixedly installed on one side of the card frame (39). Limiting grooves (42) are opened on the outer walls of piston box one (30) and piston box two (31). The limiting slider (41) is slidably connected to the limiting groove (42). A limiting rod (43) is fixedly installed on the inner wall of the limiting groove (42). The limiting rod (43) moves through the limiting slider (41). A spring two (44) surrounds the outer wall of the limiting rod (43). The spring two (44) is fixedly installed between the front of the limiting slider (41) and the inner wall of the limiting groove (42).

7. The discharge auxiliary device for a plate and frame filter press according to claim 6, characterized in that: The threaded hole on the card frame (39) is threaded with a fastening bolt (45). The outer walls of the piston box one (30) and piston box two (31) are provided with positioning grooves (46), and the fastening bolt (45) is inserted into the positioning groove (46).

8. The discharge auxiliary device for a plate and frame filter press according to claim 1, characterized in that: The piston box 1 (30) and piston box 2 (31) are provided with a sealing frame groove 2 (34) at opposite ends. The piston box 2 (31) and piston box 1 (30) are fixedly installed with a sealing frame plate 2 (33) and a sealing ring 2 (32). The sealing frame plate 2 (33) is inserted into the sealing frame groove 2 (34), and the sealing ring 2 (32) is tightly fitted to one end of the piston box 1 (30).

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