Plate and frame filter press, plate and frame filter press for battery-grade iron phosphate and its filtration process

Abstract

The present invention provides a plate-and-frame filter press, comprising two frames and a plurality of guide rods; a pressure plate movably connected to the guide rods; filter plates movably connected to the guide rods; an input channel is provided through the top of the filter plate body; a filter chamber, a conduction port, and a support chamber are provided on the filter plate body; a support protrusion is provided in the support chamber; an L-shaped discharge channel is provided at the bottom of the support chamber; a discharge pipe communicating with the discharge channel is provided on the side of the filter plate body; a seal for blocking fluid from passing through is provided in the input channel at the X end; a plate-pulling trolley is used to drive the filter plate body to move; leak-proof rings are provided on both sides of each filter plate body; a filter portion is provided between two adjacent filter plate bodies; one end of an auxiliary belt is connected to the bottom of the filter portion, and the other end is connected to the adjacent filter plate body on the X side of the auxiliary belt. The plate-and-frame filter press provided by the present invention provides a new filter press.

Description

Technical Field

[0001] The invention belongs to the technical field of plate and frame filter presses, and relates to a plate and frame filter press, a plate and frame filter press for battery-grade iron phosphate, and a filtration process thereof. Background Art

[0002] Plate and frame filter presses were the first machines used in chemical dehydration. Although they typically operate intermittently, require significant capital investment, and have relatively low filtration capacity, they are still widely used in some small sewage treatment plants due to their advantages, including high filtration force, high filter cake solids content, clear filtrate, high solids recovery rate, and low consumption of conditioning chemicals. Furthermore, they are also used in the production of battery materials, for example, for filtering and washing iron phosphate materials.

[0003] The plates and frames in the currently common plate and frame filter press are arranged alternately. Filter cloth is covered on both sides of the filter plates, and a clamping device is used to press the plates and frames together, forming a filter press chamber between the plates and frames. A small hole is opened in the same position in the middle of the upper ends of the plates and frames, which, after being pressed, form a channel. Fluid pressurized to 0.2-0.4 MPa enters the filter press chamber through this channel. The surface of the filter plates is engraved with grooves, and the lower ends are drilled with channels for filtrate discharge. Under pressure, the filtrate passes through the filter cloth, along the grooves and channels, and out of the filter, allowing water in the fluid to escape. Plate and frame filter presses are not only used in sewage treatment, but also have a wide range of applications in the chemical industry. For example, in the production of battery materials, plate and frame filter presses are also needed to separate water and materials.

[0004] After the filtration is completed, the plates and frames are separated one by one by the plate pulling trolley, and then the filtrate (usually in the form of sludge, that is, it contains a certain amount of water but also has a certain degree of dryness) falls under the action of gravity; but some materials will adhere to the filter cloth. At this time, workers need to use a shovel or other tools to scrape the filtrate off the filter cloth, or there is a lifting mechanism on the plate pulling trolley of some filter presses, which is used to lift and lower the plate, so that the plate can hit the machine body and the filtrate will vibrate off under the action of gravity. Summary of the Invention

[0005] The present invention aims to provide a plate and frame filter press, a plate and frame filter press for battery-grade iron phosphate and a filtration process thereof, aiming to provide a new filter press.

[0006] In order to achieve the above technical effects, the present invention provides a plate and frame filter press, comprising:

[0007] Two frames arranged opposite to each other, with a plurality of guide rods arranged horizontally between the two frames;

[0008] A pressure plate, the pressure plate is movably connected to the guide rod, and a pressure mechanism is horizontally arranged on the frame at the X end, the pressure mechanism is used to drive the pressure plate to reciprocate;

[0009] A plurality of filter plate bodies, each of which is movably connected to the guide rod, an input channel is provided through the top of the filter plate body, a filter chamber is provided on the X side of the filter plate body, the bottom of the input channel is communicated with the top of the filter chamber through a conduction port, a support chamber is provided on the -X side of the filter plate body, the filter chamber and the surrounding areas of the support chamber are all at a set distance from the edge of the filter plate body and the input channel, a support protrusion is provided in the support chamber, an L-shaped discharge channel is provided at the bottom of the support chamber, a discharge pipe communicating with the discharge channel is provided on the side of the filter plate body, and a seal for blocking the passage of fluid is provided in the input channel at the X end;

[0010] A plate pulling trolley, which is used to drive the filter plate body to move;

[0011] An annular leak-proof ring is provided on both sides of each filter plate body. A fluid channel is provided on the frame at the -X end. The fluid channel, the leak-proof ring and the input channel are all interconnected. Adjacent leak-proof rings, the leak-proof ring at the -X end and the frame at the -X end, and the leak-proof ring at the X end and the pressure plate are in contact with each other.

[0012] A filter portion, wherein each of the two adjacent filter plate bodies has a filter portion, the top of the filter portion is connected to the adjacent filter plate body on the -X side of the filter portion, the projections of the filter chamber and the support chamber along the X direction are both located within the projection of the filter portion along the X direction, and both sides and the bottom of the filter portion are sealed and clamped by the filter plate bodies;

[0013] An auxiliary belt, one end of which is connected to the bottom of the filter portion, and the other end is connected to the adjacent filter plate body on the auxiliary belt X side, and the auxiliary belt is used to drive the filter portion to separate from the corresponding filter chamber.

[0014] The present invention is further configured such that an auxiliary rod is horizontally provided at the bottom of the filter portion, and both ends of the auxiliary rod are located outside the filter portion;

[0015] A first connecting seat is provided on the outside of the filter plate body, one end of the auxiliary belt is connected to the part of the auxiliary rod located outside the filter part, and the other end is connected to the first connecting seat. During filtration, the auxiliary rod is located below the filter plate body, and the auxiliary belt is located on the outside of the filter plate body.

[0016] The present invention is further configured such that a second connecting seat is further provided on the side of the filter plate body, the second connecting seat is higher than the first connecting seat, an elastic band is provided on the first connecting seat, one end of the elastic band is connected to the second connecting seat, and the other end is connected to the portion of the auxiliary rod located outside the filter portion, and the elastic band is located on the outside of the filter plate body;

[0017] Also included are:

[0018] A horizontal limit cover, wherein the length direction of the limit cover is parallel to the length direction of the auxiliary rod, the longitudinal section of the limit cover is an arc shape with an opening downward, and the end of the auxiliary rod can be fitted with the inner wall of the limit cover. When the filter plate body on the adjacent X side of the limit cover moves to the maximum distance, the elastic band is in an extended state, and the auxiliary band drives the auxiliary rod to separate from the limit cover. When the auxiliary rod naturally droops, the elastic band is in an original length or relaxed state.

[0019] a first support column and a second support column lower than the first support column, the first support column and the second support column are both horizontally rotatably connected to the two frames, and the first support column and the second support column are provided on both sides of the filter plate body, and the frames are provided with motors for driving the first support column and the second support column to rotate respectively;

[0020] a first limiting protrusion and a second limiting protrusion, wherein the first supporting column is provided with a plurality of pairs of the first limiting protrusions, and the second supporting column is provided with a plurality of pairs of the second limiting protrusions;

[0021] The filter plate body includes an odd filter plate body and an even filter plate body arranged in sequence, the pressure plate abuts against one of the odd filter plates, and a first sliding portion and a second sliding portion are provided on both sides of the odd filter plate body. The lower side of the first sliding portion is movably attached to the first support column, and the lower side of the second sliding portion is movably attached to the second support column. The inner wall of the first sliding portion is provided with a clearance groove for the first limiting protrusion to pass through;

[0022] A third sliding portion is provided on both sides of the filter plate body, the lower side of the third sliding portion is movably attached to the first support column, the first limiting protrusion can limit the third sliding portion or move it to the side of the active track of the third sliding portion, and the second limiting protrusion is used to limit the second sliding portion or move it to the side of the active track of the second sliding portion;

[0023] The outer sides of the first sliding part and the third sliding part are both provided with linkage parts, and the plate pulling trolley drives the odd filter plate body or the even filter plate body to move through the linkage parts.

[0024] The present invention is further configured such that a C-shaped telescopic portion is vertically provided on the lower side of the -X side of the limit cover, the opening of the telescopic portion is facing downward in the X direction, a telescopic body is horizontally provided at the bottom of all the telescopic portions on the same side, a support frame is horizontally provided between the bottoms of the two frames, a driving member is horizontally provided on the support frame, a piston rod of the driving member is connected to the telescopic body, and the driving member is used to drive the telescopic body close to or away from the filtering portion.

[0025] The present invention is further configured such that a stabilizing rod is horizontally arranged on the outer side of the telescopic body, the stabilizing rod movably passes through the support frame, and the outer wall of the portion of the stabilizing rod passing through the support frame is fitted to the support frame, and a guide portion is obliquely arranged on the top of the end of the limit cover away from the driving member, and the bottom of the guide portion is connected to the limit cover.

[0026] The present invention is further configured such that a magnetic body that can be magnetically attracted to the auxiliary rod is horizontally arranged between the bottoms of the two racks, and both ends of the auxiliary rod are respectively located above the two magnetic bodies.

[0027] The present invention is further configured as follows: the plate pulling trolley includes a car body and an adjusting rod horizontally rotatably connected to the car body; a vertical rod perpendicular to the adjusting rod is provided in the middle of the adjusting rod; a receiving slot for the vertical rod to enter is provided on the top of the car body; a motor for driving the adjusting rod to rotate is provided on the car body; the motor can drive the vertical rod to be in a vertical or horizontal state; when the vertical rod is in a horizontal state, the vertical rod and the linkage part are in a misaligned state; when the vertical rod is in a vertical state, the vertical rod can act on the X side or the -X side of any one of the linkage parts;

[0028] A movable column and a driving screw are also horizontally arranged between the two frames. The longitudinal section of the movable column is rectangular. The movable column and the driving screw both pass through the bottom of the vehicle body. The driving screw is threadedly engaged with the vehicle body. The outer wall of the movable column is movably fitted to the vehicle body. A motor for driving the driving screw to rotate is provided on the frame.

[0029] The present invention is further configured such that a clamping groove is provided on the X side of the filter plate body, and a clamping protrusion is provided on the -X side, and the filter portion is clamped between the clamping protrusion and the clamping groove;

[0030] The sides of the pressure plate and the filter plate body are both provided with connecting ears, and the connecting ears are movably sleeved on the guide rod.

[0031] The present invention also provides a plate and frame filter press for battery-grade iron phosphate, comprising a plate and frame filter press as described in any one of the above items.

[0032] The present invention also provides a process for filtration using a plate and frame filter press as described above, characterized in that it comprises the following steps:

[0033] S1, the pressure plate moves under the drive of the pressure mechanism and presses all the filter plates tightly until the fluid channel, the leak-proof ring, and the input channel are sealed and connected, and the adjacent filter plates clamp the filter part to maintain the position of the filter part;

[0034] S2, the liquid to be filtered is transported by the pump into the fluid channel and then into all input channels. The fluid enters the filter chamber through the conduction port and is subjected to the corresponding pressure;

[0035] S3, after being filtered by the filter unit, the liquid enters the support chamber, and the support protrusions support the filter unit, allowing the liquid to flow in the support chamber;

[0036] S4, the fluid flows into the discharge channel and is discharged outward through the discharge pipe;

[0037] S5, after the filtration is completed, a filter cake is formed in the filter part and the filter chamber, the pressure plate moves in the reverse direction, and the filter plate body is loosened;

[0038] S6, the plate pulling trolley drives the filter plate body at the X end to move. During the movement of the filter plate body, the filter part is first attached to the filter plate body where the filter chamber is located under the force of the filter cake. As the plate pulling trolley moves, the auxiliary belt pulls the filter part toward the X side, thereby tearing the filter part off the corresponding filter plate body;

[0039] S7, the filter unit pulls the filter cake out of the filter chamber. At this time, the filter unit is in an inclined state, and the filter cake falls under the action of gravity and the movement of the filter unit;

[0040] S8, after all the filter cakes on the filter parts have fallen off, flush the filter parts or not;

[0041] S9, the pressure plate presses all the filter plates toward the -X end to perform the next filtration.

[0042] Compared with the prior art, the present invention provides a plate and frame filter press. During the filtration process, the pressure plate first moves under the drive of a pressure mechanism (preferably a conventional structure such as an oil cylinder or an electric push rod) and presses all the filter plate bodies until the fluid channels, the leak-proof rings and the input channels are sealed and connected, and the adjacent filter plate bodies clamp the filter parts to maintain the position of the filter parts. When the pressure plate presses the filter plate bodies, not only can the filter parts be clamped to maintain their position and prevent liquid leakage, but the presence of the leak-proof ring on the top also allows the liquid to flow normally in the filter plate body to prevent leakage. According to actual conditions, a groove can be provided at the end of the leak-proof ring, and then a flexible sealing ring can be provided in the groove, so that the leak-proof effect of the leak-proof ring is better.

[0043] After being pumped by the pump, the liquid to be filtered enters the fluid channel and all input channels. The fluid then enters the filter chamber through the conduction port and is subjected to corresponding pressure. After being filtered by the filter unit, the liquid enters the support chamber, and the support protrusions support the filter unit, allowing the liquid to flow within the support chamber. The support protrusions can be either spaced protrusions as shown in the accompanying drawings or vertical strips. If they are strips, the gaps between each adjacent strip form a space for liquid flow, and the bottom of each space has a discharge channel. The fluid flows into the discharge channel and is discharged outward through the discharge pipe.

[0044] After the filtration is completed, a filter cake is formed in the filter part and the filter chamber, and the pressure plate moves in the opposite direction to loosen the filter plate body; the plate pulling trolley drives the filter plate body at the X end to move. During the movement of the filter plate body, the filter part is first attached to the filter plate body where the filter chamber is located under the force of the filter cake. As the plate pulling trolley moves, the auxiliary belt pulls the filter part toward the X side, thereby tearing the filter part off the corresponding filter plate body;

[0045] Since the filter part is porous, the contact area between the filter cake and the filter part is usually larger, so there is better intermolecular force; secondly, the porous structure also allows the filter cake to be stuck on the filter part to a certain extent, so when the filter part is separated from the filter plate body, the filter cake will move with the filter part; after the filter part pulls the filter cake out of the filter chamber, since the filter part is in an inclined state at this time, the filter cake falls under the action of gravity and the movement of the filter part; when the filter cakes on all the filter parts fall off, the filter part is flushed or not (flushing or not can be selected according to the situation of different materials); finally, the pressure plate presses all the filter plates toward the -X end for the next filtration.

[0046] Since the filter cake in this application does not require workers to use tools to shovel the filter cake off the filter part, the filter part can be better protected; secondly, since there is no need to lift and shake the filter plate body by a pulling plate trolley, it not only improves efficiency, but also can better protect the equipment, and the use effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a structural diagram of an embodiment of a plate and frame filter press according to the present invention;

[0048] Figure 2 yes Figure 1 Enlarged view of part A;

[0049] Figure 3 yes Figure 1 Enlarged view of part B;

[0050] Figure 4 yes Figure 1 Enlarged view of part C;

[0051] Figure 5 yes Figure 1 Enlarged view of part D in the middle;

[0052] Figure 6 This is a cross-sectional view of an embodiment of a plate and frame filter press of the present invention. Figure 1 ;

[0053] Figure 7 yes Figure 6 Enlarged view of part E in the middle;

[0054] Figure 8 yes Figure 6 Enlarged view of part F;

[0055] Figure 9 This is a cross-sectional view of an embodiment of a plate and frame filter press of the present invention. Figure 2 ;

[0056] Figure 10 yes Figure 9 Enlarged view of section G;

[0057] Figure 11 This is a schematic diagram of an embodiment of a telescopic portion of a plate and frame filter press according to the present invention;

[0058] Figure 12 It is a cross-sectional view of an embodiment of a first support column portion in a plate and frame filter press of the present invention;

[0059] Figure 13 It is a schematic diagram of an embodiment of the first support column and the second support column in a plate and frame filter press of the present invention;

[0060] Figure 14 yes Figure 13 Enlarged view of section H;

[0061] Figure 15 yes Figure 13 Enlarged view of part I.

[0062] Among them, 1. frame; 2. guide rod; 3. pressure plate; 4. pressure mechanism; 5. input channel; 6. filter chamber; 7. conduction port; 8. support chamber; 9. support protrusion; 10. discharge channel; 11. discharge pipe; 12. seal; 13. fluid channel; 14. filter unit; 15. auxiliary belt; 16. auxiliary rod; 17. first connecting seat; 18. second connecting seat; 19. elastic belt; 20. limit cover; 21. first support column; 22. second support column; 23. , first limiting protrusion; 24, second limiting protrusion; 25, odd filter plate body; 26, even filter plate body; 27, first sliding part; 28, second sliding part; 29, yielding groove; 30, third sliding part; 31, linkage part; 32, telescopic part; 33, telescopic body; 34, supporting frame; 35, driving member; 36, stabilizing rod; 37, magnetic body; 38, vehicle body; 39, adjusting rod; 40, vertical rod; 41, receiving groove; 42, movable column; 43, driving screw; 44, connecting ear. DETAILED DESCRIPTION

[0063] The plate and frame filter press, the plate and frame filter press for battery-grade iron phosphate, and the filtration process thereof proposed in the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0064] A plate and frame filter press, such as Figures 1 to 15 As shown, including:

[0065] Two frames 1 are arranged opposite to each other, and a plurality of guide rods 2 are arranged horizontally between the two frames 1;

[0066] A pressure plate 3, the pressure plate 3 is movably connected to the guide rod 2, and a pressure mechanism 4 is horizontally provided on the frame 1 at the X end, the pressure mechanism 4 is used to drive the pressure plate 3 to reciprocate;

[0067] A plurality of filter plate bodies, each of which is movably connected to the guide rod 2, an input channel 5 is provided through the top of the filter plate body, a filter chamber 6 is provided on the X side of the filter plate body, the bottom of the input channel 5 is communicated with the top of the filter chamber 6 through a conduction port 7, a support chamber 8 is provided on the -X side of the filter plate body, the filter chamber 6 and the surrounding areas of the support chamber 8 are all at a set distance from the edge of the filter plate body and the input channel 5 (wherein "set distance", "set gap" or similar descriptive words indicate that the two objects are in a state of non-direct contact, and the actual gap or distance size can be selected according to actual conditions), a support protrusion 9 is provided in the support chamber 8, an L-shaped discharge channel 10 is provided at the bottom of the support chamber 8, a discharge pipe 11 communicating with the discharge channel 10 is provided on the side of the filter plate body, a seal 12 for blocking the passage of fluid is provided in the input channel 5 at the X end, and the input channel 5 at the end does not need to flow into liquid;

[0068] A plate pulling trolley, which is used to drive the filter plate body to move;

[0069] An annular leak-proof ring (with a small thickness, not shown in the figure) is provided on both sides of each filter plate body. A fluid channel 13 is provided on the frame 1 at the -X end. The fluid channel 13, the leak-proof ring, and the input channel 5 are all connected. Adjacent leak-proof rings, the leak-proof ring at the -X end and the frame 1 at the -X end, and the leak-proof ring at the X end and the pressure plate 3 are in contact with each other.

[0070] A filter portion 14 is provided between each of two adjacent filter plate bodies. The top of the filter portion 14 is connected to the adjacent filter plate body on the -X side of the filter portion 14. The projections of the filter chamber 6 and the support chamber 8 along the X direction are both located within the projection of the filter portion 14 along the X direction. Both sides and the bottom of the filter portion 14 are sealed and clamped by the filter plate bodies.

[0071] An auxiliary belt 15, one end of which is connected to the bottom of the filter portion 14, and the other end is connected to the adjacent filter plate body on the side of the auxiliary belt 15X. The auxiliary belt 15 is used to drive the filter portion 14 to separate from the corresponding filter chamber 6.

[0072] An auxiliary rod 16 is horizontally provided at the bottom of the filter portion 14 , and both ends of the auxiliary rod 16 are located outside the filter portion 14 ;

[0073] A first connecting seat 17 is provided on the outside of the filter plate body. One end of the auxiliary belt 15 is connected to the part of the auxiliary rod 16 located outside the filter part 14, and the other end is connected to the first connecting seat 17. During filtration, the auxiliary rod 16 is located below the filter plate body, and the auxiliary belt 15 is located on the outside of the filter plate body.

[0074] A second connecting seat 18 is further provided on the side of the filter plate body. The second connecting seat 18 is higher than the first connecting seat 17. An elastic band 19 is provided on the first connecting seat 17. One end of the elastic band 19 is connected to the second connecting seat 18, and the other end is connected to the portion of the auxiliary rod 16 located outside the filter portion 14. The elastic band 19 is located on the outside of the filter plate body.

[0075] Also included are:

[0076] A horizontal limit cover 20, the length direction of which is parallel to the length direction of the auxiliary rod 16, the longitudinal section of which is in the shape of an arc with an opening downward, the end of the auxiliary rod 16 can be fitted to the inner wall of the limit cover 20, when the filter plate body on the adjacent X side of the limit cover 20 moves to the maximum distance, the elastic band 19 is in an extended state, and the auxiliary band 15 drives the auxiliary rod 16 to detach from the limit cover 20, when the auxiliary rod 16 naturally droops, the elastic band 19 is in its original length or relaxed state;

[0077] A first support column 21 and a second support column 22 lower than the first support column 21, the first support column 21 and the second support column 22 are both horizontally rotatably connected to the two frames 1, and the first support column 21 and the second support column 22 are provided on both sides of the filter plate body, and the frame 1 is provided with a motor for driving the first support column 21 and the second support column 22 to rotate respectively;

[0078] First limiting protrusions 23 and second limiting protrusions 24. The first support column 21 is provided with a plurality of pairs of the first limiting protrusions 23, and the second support column 22 is provided with a plurality of pairs of the second limiting protrusions 24;

[0079] The filter plate body includes an odd filter plate 25 and an even filter plate 26 arranged in a cross-arranged manner. The pressure plate 3 contacts one of the odd filter plates 25. A first sliding portion 27 and a second sliding portion 28 are provided on both sides of the odd filter plate 25. The lower side of the first sliding portion 27 is movably attached to the first support column 21, and the lower side of the second sliding portion 28 is movably attached to the second support column 22. The inner wall of the first sliding portion 27 is provided with a clearance groove 29 for the first limiting protrusion 23 to pass through.

[0080] A third sliding portion 30 is provided on both sides of the filter plate body 26. The lower side of the third sliding portion 30 is movably attached to the first support column 21. The first limiting protrusion 23 can limit the third sliding portion 30 or move it to the side of the active track of the third sliding portion 30. The second limiting protrusion 24 is used to limit the second sliding portion 28 or move it to the side of the active track of the second sliding portion 28.

[0081] A linkage portion 31 is provided on the outer sides of the first sliding portion 27 and the third sliding portion 30 , and the plate pulling trolley drives the odd filter plate body 25 or the even filter plate body 26 to move via the linkage portion 31 .

[0082] A C-shaped telescopic portion 32 is vertically provided on the lower side of the -X side of the limit cover 20, and the opening of the telescopic portion 32 is facing downward in the X direction. A telescopic body 33 is horizontally provided at the bottom of all the telescopic portions 32 on the same side, and a support frame 34 is horizontally provided between the bottoms of the two frames 1. A driving member 35 is horizontally provided on the support frame 34, and a piston rod of the driving member 35 is connected to the telescopic body 33. The driving member 35 is used to drive the telescopic body 33 to move closer to or away from the filter portion 14.

[0083] A stabilizing rod 36 is horizontally provided on the outer side of the telescopic body 33, and the stabilizing rod 36 is movable through the support frame 34, and the outer wall of the portion of the stabilizing rod 36 passing through the support frame 34 is fitted with the support frame 34. A guide portion is obliquely provided on the top of the end of the limit cover 20 away from the driving member 35, and the bottom of the guide portion is connected to the limit cover 20.

[0084] A magnetic body 37 that can be magnetically attracted to the auxiliary rod 16 is horizontally arranged between the bottoms of the two racks 1, and both ends of the auxiliary rod 16 are respectively located above the two magnetic bodies 37.

[0085] The plate pulling trolley includes a car body 38 and an adjusting rod 39 horizontally rotatably connected to the car body 38. A vertical rod 40 perpendicular to the adjusting rod 39 is provided in the middle of the adjusting rod 39. A receiving groove 41 for the vertical rod 40 to enter is provided on the top of the car body 38. A motor for driving the adjusting rod 39 to rotate is provided on the car body 38. The motor can drive the vertical rod 40 to be in a vertical or horizontal state. When the vertical rod 40 is in a horizontal state, the vertical rod 40 and the linkage part 31 are in a misaligned state. When the vertical rod 40 is in a vertical state, the vertical rod 40 can act on the X side or the -X side of any one of the linkage parts 31.

[0086] A movable column 42 and a driving screw 43 are also horizontally arranged between the two frames 1. The longitudinal section of the movable column 42 is rectangular. The movable column 42 and the driving screw 43 both pass through the bottom of the vehicle body 38. The driving screw 43 is threadedly engaged with the vehicle body 38. The outer wall of the movable column 42 is movably fitted to the vehicle body 38. A motor for driving the driving screw 43 to rotate is provided on the frame 1.

[0087] The filter plate body is provided with a clamping groove on the X side and a clamping protrusion on the -X side. The filter portion 14 is clamped between the clamping protrusion and the clamping groove.

[0088] The sides of the pressure plate 3 and the filter plate body are both provided with connecting ears 44 , and the connecting ears 44 are movably sleeved on the guide rod 2 .

[0089] The present invention also provides a plate-frame filter press for battery-grade iron phosphate, including a plate-frame filter press as described in any of the above items. The plate-frame filter press in this application can be used in a wide range of situations, as long as it is applicable; at the same time, the plate-frame filter press in this application can also be selectively used in the production of battery materials; in the production of battery materials, as long as the material is washed and filtered, a filter press is required. For example, the production of battery-grade iron phosphate uses a plate-frame filter press twice, and its function is to wash and filter the solid phase material in the solution.

[0090] A process for filtration using a plate and frame filter press as described in any one of the above items, comprising the following steps:

[0091] S1, the pressure plate 3 is driven by the pressure mechanism 4 to move and press all the filter plates until the fluid channel 13, the leak-proof ring, and the input channel 5 are sealed and connected, and the adjacent filter plates clamp the filter part 14 to maintain the position of the filter part 14;

[0092] S2, the liquid to be filtered is pumped into the fluid channel 13 and then into all input channels 5. The fluid enters the filter chamber 6 through the conduction port 7 and is subjected to the corresponding pressure;

[0093] S3, after being filtered by the filter portion 14, the liquid enters the support chamber 8, and the support protrusions 9 support the filter portion 14, allowing the liquid to flow in the support chamber 8;

[0094] S4, the fluid flows into the discharge channel 10 and is discharged to the outside through the discharge pipe 11;

[0095] S5, after the filtration is completed, a filter cake is formed in the filter portion 14 and the filter chamber 6, the pressure plate 3 moves in the reverse direction, and the filter plate body is released;

[0096] S6, the plate pulling trolley drives the filter plate body at the X end to move. During the movement of the filter plate body, the filter part 14 is first attached to the filter plate body where the filter chamber 6 is located under the force of the filter cake. As the plate pulling trolley moves, the auxiliary belt 15 pulls the filter part 14 toward the X side, thereby tearing the filter part 14 off the corresponding filter plate body;

[0097] S7, the filter unit 14 pulls the filter cake out of the filter chamber 6. At this time, the filter unit 14 is in an inclined state, and the filter cake falls under the action of gravity and the movement of the filter unit 14.

[0098] S8, after all the filter cakes on the filter parts 14 have fallen off, flush the filter parts 14 or not;

[0099] S9, the pressure plate 3 presses all the filter plates toward the -X end to perform the next filtration.

[0100] In the plate and frame filter press provided by the present invention, during the filtration process, the pressure plate 3 is first driven by the pressure mechanism 4 (preferably a conventional structure such as an oil cylinder or an electric push rod) to move and press all the filter plate bodies until the fluid channel 13, the leak-proof ring, and the input channel 5 are sealed and connected, and the adjacent filter plate bodies clamp the filter part 14 to maintain the position of the filter part 14; wherein, when the pressure plate 3 presses the filter plate body, it can not only clamp the filter part 14 to maintain its position and prevent liquid leakage, but also the presence of the leak-proof ring on the top also allows the liquid to flow normally in the filter plate body to prevent leakage; according to actual conditions, a groove can be provided at the end of the leak-proof ring, and then a flexible sealing ring can be provided in the groove, so that the leak-proof effect of the leak-proof ring is better;

[0101] After being pumped by the pump, the liquid to be filtered enters the fluid channel 13 and then all input channels 5. The fluid then enters the filter chamber 6 through the conduction port 7 and is subjected to the corresponding pressure. After being filtered by the filter portion 14, the liquid enters the support chamber 8. At the same time, the support protrusions 9 support the filter portion 14, allowing the liquid to flow within the support chamber 8. The support protrusions 9 can be either spaced protrusions as shown in the accompanying drawings or vertical strips. If they are strips, the gaps between each adjacent strip form a space for the liquid to flow, and the bottom of each space has a discharge channel 10. The fluid flows into the discharge channel 10 and is discharged outward through the discharge pipe 11.

[0102] After the filtration is completed, a filter cake is formed in the filter portion 14 and the filter chamber 6, and the pressure plate 3 moves in the opposite direction and loosens the filter plate body; the plate pulling trolley drives the filter plate body at the X end to move. During the movement of the filter plate body, the filter portion 14 is first attached to the filter plate body where the filter chamber 6 is located under the force of the filter cake. As the plate pulling trolley moves, the auxiliary belt 15 pulls the filter portion 14 toward the X side, thereby tearing the filter portion 14 off the corresponding filter plate body;

[0103] Since the filter portion 14 is porous, the contact area between the filter cake and the filter portion 14 is usually larger, so there is better intermolecular force; secondly, the porous structure also enables the filter cake to be stuck on the filter portion 14 to a certain extent, so when the filter portion 14 is separated from the filter plate body, the filter cake will move with the filter portion 14; after the filter portion 14 pulls the filter cake out of the filter chamber 6, since the filter portion 14 is in an inclined state at this time, the filter cake falls under the action of gravity and the movement of the filter portion 14; when all the filter cakes on the filter portion 14 fall off, the filter portion 14 is flushed or not (flushing or not can be selected according to the situation of different materials); finally, the pressure plate 3 presses all the filter plate bodies toward the -X end for the next filter press.

[0104] Since the filter cake in this application does not require workers to use tools to shovel the filter cake off the filter part 14, the filter part 14 can be better protected; secondly, since there is no need to lift and shake the filter plate body by a pulling plate trolley, it not only improves efficiency, but also can better protect the equipment, and the use effect is better.

[0105] During the filtration process, both sides and the bottom of the filter portion 14 are located outside the filter plate body. At the same time, the clamping grooves and the clamping protrusions on both sides of the filter plate body can further clamp the filter portion 14, which not only improves the position stability of the filter portion 14 but also prevents leakage. At the same time, all the auxiliary rods 16 are limited by the limit covers 20.

[0106] When the filtration is completed, the pressure plate 3 first returns to the designated position (serving as the end position of the movement of the first odd filter plate 25); then the motor drives the first support column 21 to rotate, and all the third sliding parts 30 are clamped by the first limiting protrusion 23, so that all the even filter plates 26 are now unable to move;

[0107] Then, the external motor driving the screw rod 43 drives the screw rod 43 to rotate, and drives the vehicle body 38 to move to the position of the first filter plate 25 (wherein an optical or distance sensor is provided on the top of the vehicle body 38, which can sense the position of the first linkage part 31). After moving a certain distance to the -X side, the external motor driving the adjustment rod 39 rotates the adjustment rod 39, and rotates the vertical rod 40 to a vertical state.

[0108] The driving screw 43 is then driven by the motor to rotate, moving the vehicle body 38 in the X-direction. Simultaneously, the first filter plate 25 is moved by the vertical rod 40. During this movement, the elastic band 19 (preferably having a large elasticity) first extends and elastically stores energy. During this movement, the auxiliary rod 16 is held in place by the limiting cover 20 at both ends, and the auxiliary band 15 has not yet moved to its maximum extent.

[0109] When the filter plate 25 moves close to the pressure plate 3, the auxiliary belt 15 is straightened and pulls the auxiliary rod 16 forward. The limit cover 20 is open downward, but its curvature is not large. In addition, the inclination of the elastic belt 19 is larger. Therefore, the elastic belt 19 cannot directly pull the auxiliary rod 16 out of the limit cover 20, but the auxiliary belt 15 can pull the auxiliary rod 16 out of the limit cover 20.

[0110] That is, when the filter plate body 25 moves close to the pressure plate 3, the elastic potential energy of the elastic belt 19 is close to the maximum, and at the same time the auxiliary rod 16 is separated from the limit cover 20, so that the auxiliary rod 16 can be subjected to a larger elastic force and move upward quickly. At this time, the filter cake is better separated from the filter part 14 under the action of inertia and falls.

[0111] Since the first sliding portion 27 is provided with a clearance groove 29, the movement of the first sliding portion 27 on the first supporting column 21 is not restricted even if the first supporting column 21 rotates a certain angle. Then, when the filter plate 25 is attached to the pressure plate 3, the motor externally connected to the second supporting rod drives the second supporting rod to move, and clamps the second sliding portion 28 through the second limiting protrusion 24, thereby fixing the position of the filter plate 25.

[0112] When moving the position of the first even filter plate 26, first the vertical rod 40 is moved to the -X side of the linkage portion 31 of the even filter plate 26; then the first support column 21 rotates, and then the first even filter plate 26 is driven to move under the action of the plate pulling trolley; at this time, the position of the second odd filter plate 25 is fixed by the second limiting protrusion 24, so when the first even filter plate 26 moves close to the first odd filter plate 25, the auxiliary belt 15 disengages the second auxiliary rod 16 from the second limiting cover 20, and is able to pull the second filter part 14 upward, thereby separating the second filter cake from the filter part 14, and during the separation process, the positions of the second odd filter plate 25 and all the filter plates located on its -X side are fixed;

[0113] When the first even filter plate 26 is attached to the first odd filter plate 25, the first support column 21 rotates and fixes the positions of all the even filter plates 26; then the second support column 22 rotates to enable the subsequent odd filter plates 25 to move normally, so that the filter cakes on all the filter plates can be cleaned.

[0114] Among them, when the first even filter plate 26 moves to the first odd filter plate 25, under the action of the gravity of the auxiliary rod 16, the filter part 14 can maintain a vertical state (the elastic band 19 and the auxiliary band 15 are also in a relaxed state), that is, the auxiliary rod 16 can not affect the fit between adjacent filter plates; not only that, the magnetic body 37 located below the auxiliary rod 16 can apply a downward force to the auxiliary rod 16, so that the filter part 14 can better maintain a tensioned state; the force applied by the magnetic body 37 is relatively small, and the elastic band 19 can apply a larger upward force to the auxiliary rod 16.

[0115] The height of the first support column 21 is relatively large, so it can better improve the activity stability of the odd filter plate 25 and the even filter plate 26. Secondly, the second sliding portion 28 is also limited and guided by the second support column 22, so the position stability of the odd filter plate 25 can be further improved; not only that, the four corners of the odd filter plate 25 and the even filter plate 26 are slidably connected to the guide column through the connecting ears 44, so the activity stability of the odd filter plate 25 and the even filter plate 26 can be guaranteed.

[0116] In the process of unloading the filter cake, the positions of the telescopic body 33 and the telescopic portion 32 are fixed. Therefore, the auxiliary rod 16 in the middle position will naturally droop to the outside of the telescopic portion 32 after it is released from the limiting cover 20. However, since the longitudinal section of the telescopic portion 32 is C-shaped, even if the auxiliary rod 16 acts on the outside of the telescopic portion 32 and the top of the limiting cover 20, it can normally pass over the telescopic portion 32 and the limiting cover 20, so that the filter plate can normally move in the X direction.

[0117] Among them, the position of the filter plate body at the -X end is fixed and will not be moved by the plate pulling trolley, but it can proceed normally when separating the filter cake.

[0118] When all the filter cakes are unloaded, the driving member 35 (preferably a conventional structure such as a cylinder or an electric push rod) first drives the telescopic body 33 to move outward, and makes the movement trajectory of the limit cover 20 and the auxiliary rod 16 have no intersection; then the pressure plate 3 applies pressure and makes all the filter plate bodies return to their original positions; then the driving member 35 drives the telescopic body 33 to move inward, so that the limit cover 20 can be sleeved on the auxiliary rod 16 at the corresponding position; the magnetic body 37 at this time can also maintain or improve the position stability of the auxiliary rod 16, which facilitates the connection between the limit cover 20 and the auxiliary rod 16; not only that, the guide part at the end of the limit cover 20 can make the auxiliary rod 16 better sleeved into the limit cover 20 and wait for the next use. At the same time, since the first connecting seat 17 and the second connecting seat 18 are both located on the outside of the filter plate body, and the auxiliary belt 15 and the elastic belt 19 are also located on the outside of the filter plate body, during filtering, the auxiliary belt 15 and the elastic belt 19 can be better prevented from getting stuck in the adjacent filter plate body, so that filtration can be carried out stably and efficiently.

[0119] In actual use, if the viscosity of the filter cake is too high, the filter cake will still adhere to the filter part 14 even after the filter part 14 bounces up; at this time, since the filter part 14 is in an inclined state and the filter cake is adhered to the lower side of the filter part 14, the worker only needs to hit the upper side of the filter part 14 with a tool such as a stick. This can effectively prevent the filter part 14 from being broken by a shovel, etc., and the use effect is better.

[0120] If the filter part 14 needs to be cleaned, since the filter part 14 is in an inclined state at this time and the remaining filter cake is on the lower side of the filter part 14, the residue can be better washed down when spraying and flushing from the top; not only that, the conventional filter cloth is attached to the filter plate, so its flushing effect is poor; but the lower side of the filter part 14 in the present application is hollow, so the flushing effect is better when flushing; and in actual flushing, the upper and lower parts can be carried out simultaneously or asynchronously, and there are no excessive restrictions here.

[0121] Among them, the longitudinal section of the limiting cover 20 is an arc shape with an opening downward, and the filter part 14 is made of cloth or other conventional filter materials, so it can undergo a small elastic deformation; so when the auxiliary belt 15 disengages the auxiliary rod 16 from the limiting cover 20, the auxiliary rod 16 will first move downward for a certain distance, and then rise upward at a larger speed; among them, when the filter part 14 undergoes elastic deformation downward, the filter part 14 can move relative to the filter cake to a certain extent. For the subsequent raising and separating of the filter cake by the auxiliary rod 16, the relative movement of the filter cake and the filter part 14 at this time plays a loosening role, which can better facilitate the separation of the filter cake from the filter part 14.

[0122] At the same time, during use, the discharge pipe 11 is relatively long, which not only can discharge water better, but also the discharge pipe 11 is a natural insulator for the auxiliary belt 15 and the elastic belt 19, which can well prevent the adjacent auxiliary belts 15, elastic belts 19 from getting entangled, etc., thereby ensuring normal use.

[0123] It should also be noted that, in the present embodiment, the auxiliary belt 15 functions to pull the auxiliary rod 16 out of the limit cover 20, so that it will be straightened only when the filter plate body is close to the maximum movable distance; however, if the filter portion 14 is torn off from the filter plate body by relying solely on the auxiliary belt 15, the length of the auxiliary belt 15 is preferably smaller, so that when the filter plate body moves to the middle position, the filter portion 14 can be torn off from the filter plate body, and finally the filter portion 14 and the auxiliary belt 15 can be in a V-shape with the opening upward, so that the filter cake can be better removed to this extent.

[0124] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0125] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A plate and frame filter press, characterized in that: include: Two frames (1) are arranged opposite to each other, and a plurality of guide rods (2) are arranged horizontally between the two frames (1); A pressure plate (3), the pressure plate (3) is movably connected to the guide rod (2), and a pressure mechanism (4) is horizontally arranged on the frame (1) at the X end, and the pressure mechanism (4) is used to drive the pressure plate (3) to reciprocate; A plurality of filter plate bodies, each of which is movably connected to the guide rod (2), an input channel (5) is provided through the top of the filter plate body, a filter chamber (6) is provided on the X side of the filter plate body, the bottom of the input channel (5) is communicated with the top of the filter chamber (6) through a conduction port (7), a support chamber (8) is provided on the -X side of the filter plate body, the filter chamber (6) and the support chamber (8) are all at a set distance from the edge of the filter plate body and the input channel (5), a support protrusion (9) is provided in the support chamber (8), an L-shaped discharge channel (10) is provided at the bottom of the support chamber (8), a discharge pipe (11) communicating with the discharge channel (10) is provided on the side of the filter plate body, and a sealing member (12) for blocking the passage of fluid is provided in the input channel (5) at the X end; A plate pulling trolley, which is used to drive the filter plate body to move; An annular leak-proof ring is provided on both sides of each filter plate body. A fluid channel (13) is provided on the frame (1) at the -X end. The fluid channel (13), the leak-proof ring and the input channel (5) are all interconnected. Adjacent leak-proof rings, the leak-proof ring at the -X end and the frame (1) at the -X end, and the leak-proof ring at the X end and the pressure plate (3) are all in a state of conflict. A filter portion (14), wherein each of the two adjacent filter plate bodies has a filter portion (14), the top of the filter portion (14) is connected to the adjacent filter plate body located on the -X side of the filter portion (14), the projections of the filter chamber (6) and the support chamber (8) along the X direction are both located within the projection of the filter portion (14) along the X direction, and both sides and the bottom of the filter portion (14) are sealed and clamped by the filter plate body; an auxiliary belt (15), one end of the auxiliary belt (15) being connected to the bottom of the filter portion (14), and the other end being connected to the adjacent filter plate body on the X side of the auxiliary belt (15), the auxiliary belt (15) being used to drive the filter portion (14) to separate from the corresponding filter chamber (6); An auxiliary rod (16) is horizontally arranged at the bottom of the filter portion (14), and both ends of the auxiliary rod (16) are located outside the filter portion (14); A first connecting seat (17) is provided on the outside of the filter plate body, one end of the auxiliary belt (15) is connected to the portion of the auxiliary rod (16) located outside the filter portion (14), and the other end is connected to the first connecting seat (17). During filtration, the auxiliary rod (16) is located below the filter plate body, and the auxiliary belt (15) is located on the outside of the filter plate body. A second connecting seat (18) is further provided on the side of the filter plate body, the second connecting seat (18) is higher than the first connecting seat (17), an elastic band (19) is provided on the first connecting seat (17), one end of the elastic band (19) is connected to the second connecting seat (18), and the other end is connected to the portion of the auxiliary rod (16) located outside the filter portion (14), and the elastic band (19) is located on the outside of the filter plate body; Also included are: A horizontal limiting cover (20) is provided, wherein the length direction of the limiting cover (20) is parallel to the length direction of the auxiliary rod (16), and the longitudinal section of the limiting cover (20) is in the shape of an arc with an opening facing downward. The end of the auxiliary rod (16) can be fitted to the inner wall of the limiting cover (20). When the filter plate body on the adjacent X side of the limiting cover (20) moves to a maximum distance, the elastic band (19) is in an extended state, and the auxiliary band (15) drives the auxiliary rod (16) to separate from the limiting cover (20). When the auxiliary rod (16) naturally droops, the elastic band (19) is in an original length or relaxed state.

2. A plate and frame filter press according to claim 1, characterized in that: Also included are: a first support column (21) and a second support column (22) lower than the first support column (21), the first support column (21) and the second support column (22) are both horizontally rotatably connected to the two frames (1), and both sides of the filter plate body are provided with the first support column (21) and the second support column (22), and the frame (1) is provided with a motor for driving the first support column (21) and the second support column (22) to rotate respectively; a first limiting protrusion (23) and a second limiting protrusion (24), wherein the first supporting column (21) is provided with a plurality of pairs of the first limiting protrusions (23), and the second supporting column (22) is provided with a plurality of pairs of the second limiting protrusions (24); The filter plate body comprises an odd filter plate body (25) and an even filter plate body (26) arranged in a cross-arranged sequence, the pressure plate (3) abuts against one of the odd filter plate bodies (25), a first sliding portion (27) and a second sliding portion (28) are provided on both sides of the odd filter plate body (25), the lower side of the first sliding portion (27) is movably fitted to the first support column (21), and the lower side of the second sliding portion (28) is movably fitted to the second support column (22), and the inner wall of the first sliding portion (27) is provided with a clearance groove (29) for the first limiting protrusion (23) to pass through; A third sliding portion (30) is provided on both sides of the filter plate body (26); the lower side of the third sliding portion (30) is movably attached to the first support column (21); the first limiting protrusion (23) can limit the third sliding portion (30) or move it to the side of the active track of the third sliding portion (30); and the second limiting protrusion (24) is used to limit the second sliding portion (28) or move it to the side of the active track of the second sliding portion (28); The outer sides of the first sliding part (27) and the third sliding part (30) are both provided with linkage parts (31), and the plate pulling trolley drives the odd filter plate body (25) or the even filter plate body (26) to move through the linkage parts (31).

3. A plate and frame filter press according to claim 2, characterized in that: A C-shaped telescopic portion (32) is vertically arranged on the lower side of the -X side of the limiting cover (20), the opening of the telescopic portion (32) faces downward in the X direction, and a telescopic body (33) is horizontally arranged at the bottom of all the telescopic portions (32) on the same side. A support frame (34) is horizontally arranged between the bottoms of the two frames (1), and a driving member (35) is horizontally arranged on the support frame (34). The piston rod of the driving member (35) is connected to the telescopic body (33), and the driving member (35) is used to drive the telescopic body (33) to approach or move away from the filter portion (14).

4. A plate and frame filter press according to claim 3, characterized in that: A stabilizing rod (36) is horizontally arranged on the outer side of the telescopic body (33), and the stabilizing rod (36) is movable through the support frame (34), and the outer wall of the portion of the stabilizing rod (36) passing through the support frame (34) is attached to the support frame (34), and a guide portion is inclined at the top of one end of the limiting cover (20) away from the driving member (35), and the bottom of the guide portion is connected to the limiting cover (20).

5. The plate and frame filter press according to claim 4, characterized in that: A magnetic body (37) that can be magnetically attracted to the auxiliary rod (16) is also horizontally arranged between the bottoms of the two frames (1), and both ends of the auxiliary rod (16) are respectively located above the two magnetic bodies (37).

6. The plate and frame filter press according to claim 2, characterized in that: The pull plate trolley includes a car body (38) and an adjusting rod (39) connected to the car body (38) for horizontal rotation. A vertical rod (40) perpendicular to the adjusting rod (39) is provided in the middle of the adjusting rod (39). A receiving groove (41) for the vertical rod (40) to enter is provided on the top of the car body (38). A motor for driving the adjusting rod (39) to rotate is provided on the car body (38). The motor can drive the vertical rod (40) to be in a vertical or horizontal state. When the vertical rod (40) is in a horizontal state, the vertical rod (40) and the linkage part (31) are in a dislocated state. When the vertical rod (40) is in a vertical state, the vertical rod (40) can act on the X side or the -X side of any linkage part (31). A movable column (42) and a driving screw (43) are also horizontally arranged between the two frames (1). The longitudinal section of the movable column (42) is rectangular. The movable column (42) and the driving screw (43) both pass through the bottom of the vehicle body (38). The driving screw (43) is threadedly engaged with the vehicle body (38). The outer wall of the movable column (42) is movably fitted to the vehicle body (38). A motor for driving the driving screw (43) to rotate is arranged on the frame (1).

7. The plate and frame filter press according to claim 1, characterized in that: The filter plate body is provided with a clamping groove on the X side and a clamping protrusion on the -X side, and the filter portion (14) is clamped between the clamping protrusion and the clamping groove; The pressure plate (3) and the side of the filter plate body are both provided with connecting ears (44), and the connecting ears (44) are movably sleeved on the guide rod (2).

8. A plate and frame filter press for battery-grade iron phosphate, characterized in that: It comprises a plate and frame filter press as described in any one of claims 1 to 7.

9. A process for filtration using a plate and frame filter press according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, the pressure plate (3) moves under the drive of the pressure mechanism (4) and presses all the filter plates until the fluid channel (13), the leak-proof ring, and the input channel (5) are sealed and connected, and the adjacent filter plates clamp the filter part (14) to maintain the position of the filter part (14); S2, the liquid to be filtered is transported by the pump into the fluid channel (13), and then into all the input channels (5). The fluid enters the filter chamber (6) through the conduction port (7) and is subjected to the corresponding pressure; S3, after being filtered by the filter portion (14), the liquid enters the support chamber (8), and at the same time, the support protrusion (9) supports the filter portion (14), so that the liquid can flow in the support chamber (8); S4, the fluid flows into the discharge channel (10) and is discharged to the outside through the discharge pipe (11); S5, after the filtration is completed, a filter cake is formed in the filter portion (14) and the filter chamber (6), the pressure plate (3) moves in the reverse direction, and the filter plate body is loosened; S6, the plate pulling trolley drives the filter plate body at the X end to move. During the movement of the filter plate body, the filter part (14) is first attached to the filter plate body where the filter chamber (6) is located under the force of the filter cake. As the plate pulling trolley moves, the auxiliary belt (15) pulls the filter part (14) toward the X side, thereby tearing the filter part (14) off the corresponding filter plate body; S7, the filter unit (14) pulls the filter cake out of the filter chamber (6), at which time the filter unit (14) is in an inclined state, and the filter cake falls under the action of gravity and the movement of the filter unit (14); S8, after all the filter cakes on the filter parts (14) have fallen off, flushing the filter parts (14) or not; S9, the pressure plate (3) presses all the filter plates toward the -X end to perform the next filtration.

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