A diaphragm plate and frame filter press system with vacuum reset function

Abstract

The present invention relates to the field of filter pressing technology, specifically a diaphragm plate and frame filter press system with a vacuum reset function; it includes a filter press and a feeding system, an extrusion vacuum system, a cleaning system, a compressed air system, and a discharging system connected to the filter press; the filter press includes a body and filter press plates slidingly connected to the front and rear inner sides of the body; multiple filter press plates are located between two front and rear end plates; adjacent filter press plates are in contact and sealed; the filter press plates are in contact and sealed with the end plates; the end plate at the rear position is fixedly connected to the rear inner wall of the body, and the front side of the end plate at the front position is pressed against the output shaft of the press; the present invention drives the shift block to rotate through a square rod, so that the thicker position on the shift block can be quickly inserted between adjacent shift plates when multiple filter press plates need to be unfolded, so that multiple filter press plates and two end plates can be quickly separated, and the filter cake can be quickly unloaded. Compared with the existing unloading method, the working efficiency of the filter press system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of filter pressing, in particular to a diaphragm plate-frame filter press system with a vacuum reset function. Background Art

[0002] A diaphragm plate and frame filter press is a device used for solid-liquid separation. It consists of alternating rigid and membrane filter plates. The rigid filter plates provide strength, supporting the structure and forming the filter chamber; the membrane filter plates, with their expandable diaphragms, play a vital role in the filtration process. During operation, material enters the filter chamber under pressure, the liquid is discharged through the filter cloth, and solid particles are trapped within the filter chamber to form a filter cake, thus achieving solid-liquid separation. The diaphragm plate and frame filter press utilizes a modular design and features excellent sealing, efficient filtration, simple operation, and strong adaptability. It is widely used in a variety of industries, including the chemical, pharmaceutical, food, environmental protection, mining, metallurgy, ceramics, textile, papermaking, and petroleum industries.

[0003] The material enters the filter chamber of the filter press through the feed pump. The liquid will flow out through the filter cloth, while the solid particles are intercepted in the filter chamber to form a filter cake. As the feed continues, the filter cake gradually thickens, and the resistance of the liquid through the filter cloth increases. However, under the action of the feed pressure, the liquid continues to pass through the filter cloth and discharge, and the solid particles continue to accumulate, initially achieving solid-liquid separation. After the feeding is completed, liquid is added to the diaphragm cavity of the filter press, causing the diaphragm to expand and squeeze the filter cake, further squeezing the water in the filter cake. After filtration, the filter cake needs to be pulled apart one by one by a plate puller to release the filter cake. Since the filter plates need to be pulled apart one by one during unloading, the operation process is cumbersome and time-consuming. Especially for large-scale production or processing of large amounts of materials, this one-by-one unloading method seriously affects overall production efficiency and increases production cycle time. In addition, after the diaphragm of ordinary diaphragm plate and frame filter press is squeezed, the diaphragm automatically resets, which takes a long time and is prone to not recovering in place, affecting the subsequent feed rate and squeezing effect. Summary of the Invention

[0004] In order to make up for the shortcomings of the existing technology, the present invention proposes a diaphragm plate and frame filter press system with a vacuum reset function. The present invention drives the shift block to rotate through a square rod, so that the thicker position on the shift block can be quickly inserted between adjacent shift pieces when multiple filter press plates need to be unfolded, thereby enabling multiple filter press plates and two end plates to be quickly separated, realizing rapid unloading of the filter cake. Compared with the existing unloading method, the working efficiency of the filter press system is improved.

[0005] The technical solution adopted by the present invention to solve its technical problems is: the diaphragm plate and frame filter press system with vacuum reset function described in the present invention comprises a filter press and a feeding system, an extrusion vacuum system, a cleaning system, a compressed air system, and a discharging system connected to the filter press; the filter press comprises a body and a filter press plate slidably connected to the inner side of the body front and back; a plurality of the filter press plates are located between the front and rear end plates; adjacent filter press plates are in contact and sealed; the filter press plates are in contact and sealed with the end plates; the end plate at the rear position is fixedly connected to the rear inner wall of the body, and the front side of the end plate at the front position is pressed against the output shaft of the press; the filter press plate and the upper surface of the end plate are fixedly connected to the paddles; a paddle block is provided between the front and rear adjacent paddles; the front and rear cross-sections of the paddle block are circular; the front and rear thicknesses of the paddle block are varied in the circumferential direction; a square groove is provided through the center of the paddle block front and back; the square grooves on all the paddle blocks pass through and are slidably connected to the square rod; the rear end of the square rod is fixedly connected to the motor output shaft on the rear inner wall of the body.

[0006] Preferably, a filter trough is provided on the rear side of the filter press plate; a filter frame is provided on the inner side of the filter trough; a filter cloth is fixedly connected to the inner side of the filter frame; the filter cloth divides the filter trough into a filter chamber at the rear and a drainage chamber at the front; a drainage pipe is provided downwardly through the drainage chamber; a first feed hole is provided through the front and back of the filter press plate and the end plate at the rear position; the first feed hole is connected to the filter chamber through the second feed hole; a membrane trough is provided on the front side of the filter press plate; an elastic membrane is fixedly connected in the membrane trough; a diaphragm cavity is formed between the elastic membrane and the bottom of the membrane trough; a first liquid inlet hole connected to the diaphragm cavity is provided on the side of the filter press plate; the first liquid inlet hole is rotatably connected to the connecting pipe; the front and rear adjacent connecting pipes are connected by an extension pipe.

[0007] Preferably, the filter frame is slidingly and sealably connected in the filter tank; a push groove is provided at the bottom of the filter tank; a push bar is slidingly and sealably connected in the push groove; the length of the push bar is greater than the depth of the push groove; the bottom of the push groove is connected to the diaphragm cavity through the second liquid inlet hole.

[0008] Preferably, the number of the square rods and motors is at least two; two adjacent shift blocks in the front-to-back direction are staggered in the left-to-right direction of the machine body; and two adjacent shift blocks in the front-to-back direction are connected to different square rods.

[0009] Preferably, the front end plate and the corresponding filter press plate, the adjacent filter press plates, and the rear end plate and the corresponding filter press plate are connected by a second tension spring; the front and rear side walls of the filter press plate are both provided with avoidance grooves; the second tension spring is located in the avoidance groove.

[0010] Preferably, the inner wall of the elastic membrane is connected to the bottom of the membrane groove by an elastic rope; the diameter of the elastic rope decreases as it approaches the center of the elastic membrane.

[0011] Preferably, a tension spring groove is provided at the bottom of the push groove; the bottom of the tension spring groove and the push bar are connected via a first tension spring; and the tension of the first tension spring is less than the tension of the elastic rope.

[0012] Preferably, a shielding groove is provided at the bottom of the filter tank near the second feed hole; a shielding piece is slidably connected in the shielding groove; the shielding piece is fixedly connected to the filter frame; the shielding piece can shield the second feed hole as the filter frame moves.

[0013] Preferably, the feeding system includes a conditioning tank and a feed pump connected to the conditioning tank through a pipeline; the outlet of the feed pump is connected to the first feed hole on the filter press through a pipeline; a feed valve is provided on the outlet pipeline of the feed pump, a tee is connected after the feed valve, and a branch pipe is connected back to the conditioning tank as a return pipe, and a return valve is provided on the return pipe;

[0014] The extrusion vacuum system includes a clean water tank, an extrusion pump, and a vacuum pump; the water inlet of the extrusion pump is connected to the clean water tank through a pipeline, and the water outlet of the extrusion pump is connected to one of the connecting pipes of the filter press; a diaphragm extrusion valve is provided on the extrusion pump pipeline, a tee is connected after the extrusion valve, and the tee branch pipe is connected back to the clean water tank as a return pipe, a diaphragm pressure relief valve is provided on the return pipe, the vacuum pump inlet is connected to the return pipe, a vacuum valve is provided before the inlet, and the vacuum pump outlet pipe is connected to the drain hook;

[0015] The unloading system includes a chain conveyor and a lifting conveyor. The chain conveyor is placed directly below the filter press, and the lifting conveyor is connected to the end of the chain conveyor.

[0016] The cleaning system includes a cleaning pump and a clean water tank. The inlet of the cleaning pump is connected to the clean water tank, and the outlet is connected to the cleaning interface of the filter press. A tee is connected in front of the cleaning interface of the filter press, and a branch pipe is connected to the backwash pipeline. A water blow valve is installed on the branch pipe.

[0017] The compressed air system includes an air compressor, a process air storage tank, an air dryer, and an instrument air storage tank. The inlet of the process air storage tank is connected to the air outlet of the compressor, and the outlet is connected to the air dryer. A tee is connected to the outlet pipe, and a tee is connected in the middle of the branch pipe, which are respectively connected to the backflush interface and air blow interface of the filter press. An air blow diaphragm valve and an air blow valve are installed on the branch pipe.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention drives the shift block to rotate by a square rod, so that the thicker part of the shift block can be quickly inserted between adjacent shift pieces when multiple filter press plates need to be unfolded, thereby enabling multiple filter press plates and two end plates to be quickly separated, realizing rapid discharge of filter cakes. Compared with existing unloading methods, the working efficiency of the filter press system is improved.

[0020] 2. In the present invention, the material in the filter cavity will be squeezed by the filter cloth and the elastic membrane, that is, the front and back sides of the material in the filter cavity are squeezed. Compared with the unilateral squeezing of the material in the filter cavity, the dehydration effect of the material is better; in the filter cake unloading stage, the liquid medium in the push trough increases and pushes the push bar and the filter frame to move. The filter frame will drive the filter cloth away from the bottom of the filter trough and move backward. The volume of the filter cavity becomes smaller, and the filter cake in the filter cavity is moved out under the push of the filter cloth and the filter frame, so that the filter cake can be dropped more smoothly.

[0021] 3. In the present invention, the shift block rotates cyclically, so that the thickness of the adjacent shift pieces inserted by the shift block varies. The tension of the second tension spring is transmitted to the filter press plate and the end plate, so that the adjacent shift pieces are close to each other, so that all the filter press plates and the end portions are close to and contact each other. During the contact process of multiple filter press plates and the end plates, collisions are formed, so that the filter cake in the filter cavity is loosened by the collision. When the filter cavity is opened again, the loosened filter cake can quickly fall from the exposed filter cavity, so that the filter cake after filtration falls off more smoothly.

[0022] 4. In the present invention, the filter frame drives the filter cloth to push the filter cake out of the filter cavity. The elastic force of the elastic rope on the inner side of the elastic membrane decreases as it approaches the center, so the elastic membrane bulges in an arc shape. In this way, when the two filter press plates approach and collide with each other, the elastic membrane with an arc shape bulges more easily to crush the filter cake, making it easier for the filter cake to fall off after being broken. In the process of new material entering the filter cavity, since the residual material in the second feed hole has not been squeezed and compacted by the second diaphragm cavity, the residual material in the second feed hole can be pushed by the new material in the first feed hole to enter the filter cavity smoothly, thereby ensuring the smooth material filtration.

[0023] 5. In the present invention, negative pressure is generated by using a vacuum pump to assist the diaphragm cavity in quickly resetting after squeezing is completed. The resetting time can be shortened to less than 1 minute, thereby improving the continuous operation efficiency of the equipment. The negative pressure resetting drives the elastic membrane to retract through uniform adsorption force, and the elastic membrane is completely reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 It is a schematic diagram of the system of the present invention;

[0026] Figure 2 It is a partial perspective view of the filter press of the present invention;

[0027] Figure 3 It is a three-dimensional diagram of a plurality of filter press plates and two end plates in the present invention;

[0028] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 It is a three-dimensional diagram of a single filter press plate in the present invention;

[0030] Figure 6 It is a three-dimensional diagram of another structure of the connecting pipe and the extension pipe in the present invention;

[0031] Figure 7 yes Figure 5 A three-dimensional image from another angle;

[0032] Figure 8 is a three-dimensional diagram of the shielding groove and the shielding sheet in the present invention;

[0033] Figure 9 It is a cross-sectional view of the combination of two filter press plates in the present invention;

[0034] Figure 10 yes Figure 9 Enlarged view of point B in the middle.

[0035] In the figure: water blowing valve 11, air blowing diaphragm valve 12, air blowing valve 13, chain conveyor 14, lifting conveyor 15, conditioning tank 21, return valve 22, feed valve 23, feed pump 24, clean water tank 31, pressure relief valve 32, vacuum valve 33, vacuum pump 34, extrusion valve 35, extrusion pump 36, cleaning pump 37, air compressor 41, process air storage tank 42, air dryer 43, instrument air storage tank 44, machine body 5, press 51, filter press plate 6, first liquid inlet 60, filter tank 61, filter cavity 61 1. Drainage chamber 612, drainage pipe 613, shielding groove 614, first feed hole 62, second feed hole 63, membrane groove 64, connecting pipe 65, extension tube 651, push groove 66, push bar 661, tension spring groove 662, first tension spring 663, second liquid inlet 67, avoidance groove 68, second tension spring 681, shielding piece 69, end plate 7, paddle 71, paddle block 72, square groove 721, square rod 73, motor 74, filter frame 8, filter cloth 81, elastic membrane 9, diaphragm chamber 91, elastic rope 92. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0037] like Figures 1 to 10 As shown, the present invention includes the following embodiments:

[0038] Example 1: A diaphragm plate-frame filter press system with a vacuum reset function, comprising a filter press and a feeding system, an extrusion vacuum system, a cleaning system, a compressed air system, and a discharge system connected to the filter press; the filter press comprises a body 5 and filter press plates 6 slidably connected to the inner side of the body 5; a plurality of the filter press plates 6 are located between two front and rear end plates 7; adjacent filter press plates 6 are in contact and sealed; the filter press plates 6 are in contact and sealed with the end plates 7; the end plates 7 at the rear position are fixedly connected to the rear inner wall of the body 5, and the end plates 7 at the front position are in contact and sealed with the front inner wall of the body 5; One side is pressed against the output shaft of the press 51; the upper surfaces of the filter press plate 6 and the end plate 7 are fixedly connected to the paddles 71; a paddle block 72 is provided between the front and rear adjacent paddles 71; the front and rear cross-sections of the paddle block 72 are circular; the front and rear thickness of the paddle block 72 is varied in the circumferential direction; a square groove 721 is provided through the center of the paddle block 72; the square grooves 721 on all the paddle blocks 72 pass through and are slidably connected to the square rod 73; the rear end of the square rod 73 is fixedly connected to the output shaft of the motor 74 on the rear inner wall of the body 5.

[0039] The plurality of filter press plates 6 and the end plates 7 on the front and rear sides can slide in the front and rear directions inside the machine body 5. The press 51 is located at the front side of the plurality of filter press plates 6. The shift block 72 is always located between the gaps between two adjacent shift plates 71. The front and rear thicknesses of the shift block 72 are set to vary in the circumferential direction and have two thickness limit points. The position where the thickness of the shift block 72 is the largest is called the first limit point, and the position where the thickness of the shift block 72 is the smallest is called the second limit point. If it is necessary to bring the plurality of filter press plates 6 close to each other for folding, it is necessary to control the motor 74 to drive the square rod 73 to rotate. The square rod 73 will drive the plurality of shift blocks 72 to rotate so that the second limit point of the shift block 72 is located at The minimum distance between adjacent paddles 71 is greater than the second limit point thickness of the paddle block 72, and then the press 51 is pushed to drive the end plate 7 at the front position to move backward. During the backward movement of the end plate 7 at the front position, multiple filter press plates 6 are squeezed to move backward, so that multiple filter press plates 6 and the two end plates 7 on the front and rear sides are pressed tightly against the rear position of the inner side of the machine body 5. After the adjacent filter press plates 6 are pressed, they are in contact and sealed. The filter press plates 6 and the end plates 7 are also in contact and sealed. Then the material is driven into the filter chamber 611 in the filter press. During the filling process of the material in the filter chamber 611, the excess water contained in the material will be squeezed out, thereby achieving preliminary dehydration of the material.

[0040] Then stop feeding, and pump the liquid into the diaphragm cavity 91 in the filter press. The expansion of the diaphragm cavity 91 will squeeze the material in the filter cavity 611, so that the material in the filter cavity 611 is further dehydrated. The material in the filter cavity 611 forms a filter cake after the water is squeezed out. Then, after the diaphragm cavity 91 is controlled to shrink, the output shaft of the press 51 is controlled to shorten, and the extrusion restriction on multiple filter press plates 6 and two end plates 7 is released. Then, the motor 74 is rotated to drive the square rod 73 to rotate. During the rotation of the square rod 73, multiple shift blocks 72 are driven to rotate. During the rotation of the shift block 72, the first limit point is driven to move between adjacent shift plates 71, so that the adjacent shift plates 71 are at the first limit of the shift block 72. When the filter press plates 6 are pushed away from each other, the distance increases and they move away from each other. When the adjacent paddles 71 move away from each other, the filter press plates 6 will slide forward inside the body 5, so that all the filter press plates 6 and the end plates 7 are unfolded, so that the end plates 7 at the rear position are disengaged from the filter press plates 6, the adjacent filter press plates 6 are disengaged, and the end plates 7 at the front position are out of contact with the filter press plates 6, so that the filter cavity 611 is exposed, and the filter plates in the filter cavity 611 fall off after being exposed, so that the filter cake can be quickly discharged. In the process of unfolding multiple filter press plates 6 and end plates 7, the square grooves 721 on the corresponding paddles 71 will slide with the square rods 73, and all the paddles 71 will move forward along the square rods 73;

[0041] After the filter cake is discharged, the motor 74 is turned again to drive the square rod 73 to rotate. The square rod 73 drives the second limit point on the shift block 72 to move between the adjacent shift plates 71, thereby preventing the first limit point on the adjacent shift plates 71 from affecting the folding of the multiple filter press plates 6. Then, the press 51 is pushed to drive the multiple filter press plates 6 and the two end plates 7 to gather and fold backward. The shift block 72 moves backward along the square rod 73. After the press 51 presses the multiple filter press plates 6 and the two end plates 7, the filter chamber 611 is controlled to feed again, and this process is repeated.

[0042] The present invention drives the shift block 72 to rotate by the square rod 73, so that the thicker part on the shift block 72 can be quickly inserted between adjacent shift pieces 71 when multiple filter press plates 6 need to be unfolded, thereby enabling multiple filter press plates 6 and two end plates 7 to be quickly separated, realizing rapid unloading of the filter cake. Compared with the existing unloading method, the working efficiency of the filter press system is improved.

[0043] Embodiment 2: A filter tank 61 is provided on the rear side of the filter press plate 6; a filter frame 8 is provided inside the filter tank 61; a filter cloth 81 is fixedly connected to the inner side of the filter frame 8; the filter cloth 81 divides the filter tank 61 into a rear filter chamber 611 and a front drainage chamber 612; a drainage pipe 613 is provided downwardly through the drainage chamber 612; a first feed hole 62 is provided through the front and back of the filter press plate 6 and the end plate 7 at the rear position; the first feed hole 62 is connected to the filter chamber 611 through the second feed hole 63; a membrane tank 64 is provided on the front side of the filter press plate 6; an elastic membrane 9 is fixedly connected to the membrane tank 64; a diaphragm cavity 91 is formed between the elastic membrane 9 and the bottom of the membrane tank 64; a first liquid inlet hole 60 connected to the diaphragm cavity 91 is provided on the side of the filter press plate 6; the first liquid inlet hole 60 is rotatably connected to the connecting pipe 65; the front and rear adjacent connecting pipes 65 are connected by an extension pipe 651.

[0044] The filter frame 8 is slidingly and sealingly connected in the filter tank 61; a push groove 66 is provided at the bottom of the filter tank 61; a push bar 661 is slidingly and sealingly connected in the push groove 66; the length of the push bar 661 is greater than the depth of the push groove 66; the bottom of the push groove 66 is connected to the diaphragm cavity 91 through the second liquid inlet hole 67.

[0045] After the plurality of filter press plates 6 and the two end plates 7 are folded backward and compressed by the press 51, one of the connecting pipes 65 is connected to the vacuum pump 34. In this way, when one of the connecting pipes 65 forms a negative pressure, all the connecting pipes 65 will form a negative pressure. The liquid medium in the push groove 66 will flow into the diaphragm cavity 91 along the second liquid inlet hole 67. The liquid in the diaphragm cavity 91 will flow away along the first liquid inlet hole 60. The push bar 661 will move close to the bottom of the push groove 66, and the push bar 661 will drive the filter frame 8 along the filter groove 61. When the filter frame 8 moves close to the bottom of the filter tank 61, the filter frame 8 will drive the filter cloth 81 to move close to the bottom of the filter tank 61, so that the second feed hole 63 is connected with the filter cavity 611. In addition, the diaphragm cavity 91 is in a deflated state. Then the first feed hole 62 is controlled to feed the material. The material enters the second feed hole 63 along the first feed hole 62 and finally flows into the filter cavity 611. As the material in the filter cavity 611 increases, the water contained in the material is pressed through the filter cloth 81 into the drainage cavity 612 and finally discharged along the drainage pipe 613 to achieve filtration. The material in the cavity 611 is initially dehydrated, and then the feeding of the first feed hole 62 is stopped, and the liquid is controlled to flow into the connecting pipe 65. The liquid medium will flow along the connecting pipe 65 into the first liquid inlet hole 60, and the liquid medium in the first liquid inlet hole 60 will flow into the diaphragm cavity 91, so that the elastic membrane 9 expands and bulges toward the front side. During the process of the elastic membrane 9 bulging forward, the material in the filter cavity 611 at the front side can be squeezed, and the liquid medium in the diaphragm cavity 91 will flow along the second liquid inlet hole 67 into the push groove 66, and the push groove 6 The liquid medium in 6 will push the push bar 661 away from the push groove 66, and the push bar 661 will drive the filter frame 8 and the filter cloth 81 inside the filter frame 8 to move backward. During the backward movement of the filter cloth 81, the material in the filter cavity 611 will be squeezed. Except for the filter cavity 611 that contacts the end plate 7 at the rearmost side, the material in the other filter cavities 611 will be squeezed by the filter cloth 81 and the elastic membrane 9. In other words, the material in the filter cavity 611 is squeezed on both the front and rear sides. Compared with the unilateral squeezing of the material in the filter cavity 611, the dehydration effect of the material is better.

[0046] After the secondary filtration is completed, the liquid in the push groove 66 and the diaphragm cavity 91 is pumped away, and the multiple filter plates 6 and the two end plates 7 are controlled to separate and move away from each other, so that the filter cavity 611 is exposed. In order to make the filter cake in the filter cavity 611 fall off more thoroughly, the connecting pipe 65 is controlled to enter the liquid medium, and the first liquid inlet hole 60 will inject the liquid medium into the diaphragm cavity 91 and enter the push groove 66 along the second liquid inlet hole 67. When the liquid medium in the push groove 66 increases, it will push the push bar 661 and the filter frame 8 to move, and the filter frame 8 It will drive the filter cloth 81 away from the bottom of the filter tank 61 and move backward, the volume of the filter cavity 611 becomes smaller, and the filter cake in the filter cavity 611 is moved out under the push of the filter cloth 81 and the filter frame 8, so that the filter cake can be dropped more smoothly; after the filter cake is removed, a new round of material filtration is carried out, specifically controlling the multiple filter press plates 6 and the two end plates 7 to be folded together backward, pushing the medium in the groove 66 and the diaphragm cavity 91 to flow away, and then controlling the new material to push the old material remaining in the first feed hole 62 into the filter cavity 611 for filtration again, and repeating this process.

[0047] Example 3: The number of the square rods 73 and the motors 74 is at least two; two adjacent shift blocks 72 in the front-to-back direction are staggered in the left-to-right direction of the machine body 5; two adjacent shift blocks 72 in the front-to-back direction are connected to different square rods 73.

[0048] The front end plate 7 and the corresponding filter press plate 6, the adjacent filter press plates 6, and the rear end plate 7 and the corresponding filter press plate 6 are connected by a second tension spring 681; the front and rear side walls of the filter press plate 6 are both provided with avoidance grooves 68; the second tension spring 681 is located in the avoidance groove 68.

[0049] When the filter press 6 and the two end plates 7 need to be retracted backwards, the second limit point 72 needs to be controlled to move between the adjacent filter plates 71 to meet the requirements of retracting the filter plates 6 and the two end plates 7. When the filter press 6 and the two end plates 7 need to be retracted backwards, the second limit point 72 needs to be controlled to move between the adjacent filter plates 71 to meet the requirements of retracting the filter plates 6 and the two end plates 7. When the filter cake needs to be unloaded, it is only necessary to rotate all the square rods 73 so that all the square rods 73 drive the filter press 72 to rotate cyclically. The filter press 72 will drive the first limit point to enter between the adjacent filter plates 71. The filter press 72 rotates cyclically, so that the thickness of the adjacent filter plates 71 inserted by the filter press 72 changes. When the thickness of the adjacent filter plates 71 inserted by the filter press 72 increases, the adjacent filter plates 71 will move away from each other. The filter plates 6 and the end plates 7 separate and move away from each other. When the thickness of the shift block 72 is smaller when it is stuck in the adjacent shift pieces 71, the tension of the second tension spring 681 is transmitted to the filter press plates 6 and the end plates 7, so that the adjacent shift pieces 71 will move closer to each other, so that all the filter press plates 6 and the end portions will move closer to and contact each other. During the contact process, multiple filter press plates 6 and the end plates 7 form a collision, so that the filter cake in the filter chamber 611 is loosened by the collision, so that when the filter chamber 611 is opened again, the loosened filter cake can quickly fall from the exposed filter chamber 611, making the filter cake after filtration fall off more smoothly; after the filter cake is unloaded, the multiple filter press plates 6 and the two end plates 7 are controlled to move back and fold together, and the second tension spring 681 plays the role of pulling the multiple filter press plates 6 and the end plates 7 closer together, and the second tension spring 681 will enter the avoidance groove 68 for avoidance to ensure the sealing contact effect of the filter press plates 6 and the end plates 7.

[0050] Example 4: The inner wall of the elastic membrane 9 is connected to the bottom of the membrane groove 64 via an elastic rope 92 ; the diameter of the elastic rope 92 decreases as it approaches the center of the elastic membrane 9 .

[0051] A tension spring groove 662 is provided at the bottom of the push groove 66 ; the bottom of the tension spring groove 662 is connected to the push bar 661 via a first tension spring 663 ; the tension of the first tension spring 663 is less than the tension of the elastic rope 92 .

[0052] A blocking groove 614 is provided at the bottom of the filter groove 61 near the second feed hole 63; a blocking piece 69 is slidably connected in the blocking groove 614; the blocking piece 69 is fixedly connected to the filter frame 8; the blocking piece 69 can block the second feed hole 63 as the filter frame 8 moves.

[0053] After the multiple filter press plates 6 and the two end plates 7 are pressed together, the first liquid inlet 60 is controlled to form a negative pressure, and the liquid pressure in the push groove 66 and the diaphragm cavity 91 will gradually decrease. The filter frame 8 will be pulled down by the first tension spring 663 to drive the filter cloth 81 close to the bottom of the filter groove 61, and the filter frame 8 will drive the shielding piece 69 to move away from the opening position of the second feed hole 63. The opening of the second feed hole 63 is a flat groove. After the shielding piece 69 is moved away, the second feed hole 63 is connected to the filter cavity 611, and the liquid in the diaphragm cavity 91 is connected to the filter cavity 61. The liquid medium will also flow along the first liquid inlet 60 as pulled by the elastic rope 92, causing the elastic membrane 9 to shrink. Then, the first and second liquid inlet holes 62 and 63 are controlled to feed. After the material in the filter cavity 611 increases, the excess water in the material flows through the filter cloth 81. Then, the feeding is stopped and the first liquid inlet hole 60 is controlled to flow into the liquid medium. The liquid medium enters the push groove 66 along the diaphragm cavity 91 and the second liquid inlet hole 67. Since the tension of the first tension spring 663 is less than the tension of the elastic rope 92, Therefore, the liquid medium in the push groove 66 pushes the push bar 661 away from the bottom of the push groove 66 before the elastic membrane 9 bulges, and the push bar 661 drives the filter frame 8 and the filter cloth 81 inside the filter frame 8 away from the bottom of the filter groove 61. The filter frame 8 drives the shielding piece 69 to block the second feed hole 63, so that the second feed hole 63 is disconnected from the filter cavity 611, so as to avoid the subsequent secondary squeezing and compaction of the material in the filter cavity 611, which causes the material in the connected second feed hole 63 to be over-pressed, thereby reducing the material jam in the second feed hole 63. The probability of clogging is that as the filter cloth 81 pushes the material in the filter cavity 611 away from the corresponding filter slot 61 and approaches the corresponding elastic membrane 9 on the rear side, the speed of the push bar 661 away from the push slot 66 slows down, and the liquid accumulates in the diaphragm cavity 91, causing the diaphragm cavity 91 to expand. In this way, the elastic membrane 9 expands and squeezes the material in the front filter cavity 611, so that the material is filtered in the space of the filter cavity 611 separated from the second feed hole 63. During the secondary filtration process, the excess liquid in the filter cavity 611 flows through the filter cloth 81;

[0054] The material in the filter chamber 611 forms a filter cake after two filtrations. After the press 51 releases the front end plate 7, the control block 72 is rotated to make the multiple filter press plates 6 and the end plate 7 move away from each other, so that the filter chamber 611 is exposed. The push groove 66 and the diaphragm cavity 91 are controlled to further flow liquid. The filter frame 8 drives the filter cloth 81 to push the filter cake in the filter chamber 611 out. The elastic force of the elastic rope 92 on the inner side of the elastic membrane 9 becomes smaller as it approaches the center. Therefore, the elastic membrane 9 bulges in an arc shape. In this way, when the two filter press plates 6 approach each other and collide, the bulging elastic membrane 9 is more likely to push the filter cake out. After the filter cake is crushed, it is easier to fall off after being broken; after the filter cake is unloaded, the multiple filter press plates 6 and the two end plates 7 are controlled to move back and fold again, and after the liquid in the push groove 66 and the diaphragm cavity 91 flows out, the elastic membrane 9 and the filter frame 8 are reset, and the second feed hole 63 is connected with the filter cavity 611 again. Since the residual material in the second feed hole 63 is not compacted by the squeezing of the diaphragm cavity 91, the residual material in the second feed hole 63 can be pushed by the new material in the first feed hole 62 to enter the filter cavity 611 more smoothly, thereby ensuring the smooth filtration of the material.

[0055] Example 5: The feeding system includes a conditioning tank 21 and a feed pump 24 connected to the conditioning tank 21 through a pipeline; the outlet of the feed pump 24 is connected to the first feed hole 62 on the filter press through a pipeline; a feed valve 23 is provided on the outlet pipeline of the feed pump 24, and a tee is connected after the feed valve 23. A branch pipe is connected back to the conditioning tank 21 as a return pipe, and a return valve 22 is provided on the return pipe;

[0056] The extrusion vacuum system includes a clean water tank 31, an extrusion pump 36, and a vacuum pump 34; the water inlet of the extrusion pump 36 is connected to the clean water tank 31 via a pipeline, and the water outlet of the extrusion pump 36 is connected to one of the connecting pipes 65 of the filter press; a diaphragm extrusion valve 35 is provided on the pipeline of the extrusion pump 36, and a tee is connected after the extrusion valve 35. The tee branch pipe is connected back to the clean water tank 31 as a return pipe, and a diaphragm pressure relief valve 32 is provided on the return pipe. The inlet of the vacuum pump 34 is connected to the return pipe, and a vacuum valve 33 is provided before the inlet. The outlet pipe of the vacuum pump 34 is connected to the drain hook;

[0057] The unloading system includes a chain conveyor 14 and a lifting conveyor 15. The chain conveyor 14 is placed directly below the filter press, and the lifting conveyor 15 is connected to the end of the chain conveyor 14.

[0058] The cleaning system includes a cleaning pump 37 and a clean water tank 31. The inlet of the cleaning pump 37 is connected to the clean water tank 31, and the outlet is connected to the cleaning interface of the filter press (not shown in the figure). A tee is connected before the cleaning interface of the filter press, and a branch pipe is connected to the backwash pipeline. A water blow valve 11 is provided on the branch pipe.

[0059] The compressed air system includes an air compressor 41, a process air storage tank 42, an air dryer 43, and an instrument air storage tank 44. The inlet of the process air storage tank 42 is connected to the air outlet of the compressor, and the outlet is connected to the air dryer 43. A tee is connected to the outlet pipe, and a tee is connected in the middle of the branch pipe, which are respectively connected to the backflush interface and the air blow interface of the filter press. An air blow diaphragm valve 12 and an air blow valve 13 are provided on the branch pipe.

[0060] The material is added to the conditioning tank 21 and stirred and conditioned. After the material is ready to be fed, the feed valve 23 and the feed pump 24 are opened at the same time to pump the material into the first feed hole 62 in the filter press. The feed pump 24 stops automatically after reaching the set time, and the feed valve 23 is closed at the same time; then the extrusion pump 36 and the diaphragm extrusion valve 35 are started to pump clean water into the diaphragm cavity 91 for extrusion dehydration. After the filter cake is unloaded, the diaphragm pressure relief valve 32 is opened to naturally discharge the clean water in the diaphragm cavity 91 back to the clean water tank 31, and then the air blowing diaphragm valve 1 is opened. 2. Blow dry the residual moisture in the pipeline; then start the vacuum pump 34 to drain the residual moisture in the diaphragm cavity 91, so that the elastic membrane 9 is completely reset to start a new material filtration, and the chain conveyor 14 and the lifting conveyor 15 transport the material cake to the designated position; this embodiment uses the vacuum pump 34 to generate negative pressure, which assists the diaphragm cavity 91 to quickly reset after the pressing is completed. The reset time can be shortened to less than 1 minute, thereby improving the continuous operation efficiency of the equipment; the negative pressure reset drives the elastic membrane 9 to retract through uniform adsorption force, and the elastic membrane 9 is completely reset.

[0061] Example 6: The end of the connecting pipe 65 rotates and connects the two first rotating parts; the extension pipe 651 is composed of two hinged pipes that are hinged and connected, one of which is connected to the first rotating part of the connecting pipe at the adjacent front position, and the other hinged pipe is connected to the first rotating part of the connecting pipe at the adjacent rear position (such as Figure 6 ).

[0062] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 2 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0063] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A diaphragm plate and frame filter press system with a vacuum reset function, comprising a filter press and a feeding system, a squeeze vacuum system, a cleaning system, a compressed air system, and a discharge system connected to the filter press; characterized in that: The filter press comprises a body and filter press plates connected in a front and rear sliding manner inside the body; a plurality of filter press plates are located between the front and rear end plates; adjacent filter press plates are in contact and sealed; the filter press plates are in contact and sealed with the end plates; the end plate at the rear position is fixedly connected to the rear inner wall of the body, and the front side of the end plate at the front position is pressed against the output shaft of the press; the filter press plates and the upper surfaces of the end plates are fixedly connected with paddles; a paddle block is provided between the front and rear adjacent paddles; the front and rear cross-sections of the paddle block are circular; the front and rear thicknesses of the paddle block are varied in the circumferential direction; a square groove is provided through the center of the paddle block; the square grooves on all the paddle blocks pass through and are slidably connected to a square rod; the rear end of the square rod is fixedly connected to the motor output shaft on the rear inner wall of the body; Two adjacent shifting blocks in the front-to-back direction are staggered in the left-to-right direction of the machine body; and two adjacent shifting blocks in the front-to-back direction are connected to different square rods; The front end plate and the corresponding filter press plate, the adjacent filter press plates, and the rear end plate and the corresponding filter press plate are connected by a second tension spring; the front and rear side walls of the filter press plate are both provided with avoidance grooves; the second tension spring is located in the avoidance grooves.

2. The diaphragm plate and frame filter press system with vacuum reset function according to claim 1, characterized in that: A filter tank is provided at the rear side of the filter press plate; a filter frame is provided inside the filter tank; a filter cloth is fixedly connected to the inner side of the filter frame; the filter cloth divides the filter tank into a filter chamber at the rear and a drainage chamber at the front; a drainage pipe is provided downwardly through the drainage chamber; a first feed hole is provided through the front and back of the filter press plate and the end plate at the rear position; the first feed hole is connected to the filter chamber through the second feed hole; a membrane tank is provided at the front side of the filter press plate; an elastic membrane is fixedly connected in the membrane tank; a diaphragm cavity is formed between the elastic membrane and the bottom of the membrane tank; a first liquid inlet hole connected to the diaphragm cavity is provided on the side of the filter press plate; the first liquid inlet hole is rotatably connected to the connecting pipe; the front and rear adjacent connecting pipes are connected by an extension pipe.

3. The diaphragm plate and frame filter press system with vacuum reset function according to claim 2, characterized in that: The filter frame is slidingly and sealably connected in the filter tank; a push groove is provided at the bottom of the filter tank; a push strip is slidingly and sealably connected in the push groove; the length of the push strip is greater than the depth of the push groove; the bottom of the push groove is connected to the diaphragm cavity through the second liquid inlet hole.

4. The diaphragm plate and frame filter press system with vacuum reset function according to claim 3, characterized in that: The inner wall of the elastic membrane is connected to the bottom of the membrane groove via an elastic rope; the diameter of the elastic rope decreases as it approaches the center of the elastic membrane.

5. The diaphragm plate and frame filter press system with vacuum reset function according to claim 4, characterized in that: A tension spring groove is provided at the bottom of the push groove; the bottom of the tension spring groove and the push bar are connected via a first tension spring; the tension of the first tension spring is less than the tension of the elastic rope.

6. The diaphragm plate and frame filter press system with vacuum reset function according to claim 5, characterized in that: A shielding groove is provided at the bottom of the filter tank near the second feed hole; a shielding piece is slidably connected in the shielding groove; the shielding piece is fixedly connected to the filter frame; the shielding piece can shield the second feed hole as the filter frame moves.

7. The diaphragm plate and frame filter press system with vacuum reset function according to claim 1, characterized in that: The feed system includes a conditioning tank and a feed pump connected to the conditioning tank through a pipeline; the outlet of the feed pump is connected to the first feed hole on the filter press through a pipeline; a feed valve is provided on the outlet pipeline of the feed pump, a tee is connected after the feed valve, and a branch pipe is connected back to the conditioning tank as a return pipe, and a return valve is provided on the return pipe; The extrusion vacuum system includes a clean water tank, an extrusion pump, and a vacuum pump; the water inlet of the extrusion pump is connected to the clean water tank through a pipeline, and the water outlet of the extrusion pump is connected to one of the connecting pipes of the filter press; a diaphragm extrusion valve is provided on the extrusion pump pipeline, a tee is connected after the extrusion valve, and the tee branch pipe is connected back to the clean water tank as a return pipe, a diaphragm pressure relief valve is provided on the return pipe, the vacuum pump inlet is connected to the return pipe, a vacuum valve is provided before the inlet, and the vacuum pump outlet pipe is connected to the drain hook; The unloading system includes a chain conveyor and a lifting conveyor. The chain conveyor is placed directly below the filter press, and the lifting conveyor is connected to the end of the chain conveyor. The cleaning system includes a cleaning pump and a clean water tank. The inlet of the cleaning pump is connected to the clean water tank, and the outlet is connected to the cleaning interface of the filter press. A tee is connected in front of the cleaning interface of the filter press, and a branch pipe is connected to the backwash pipeline. A water blow valve is installed on the branch pipe. The compressed air system includes an air compressor, a process air storage tank, an air dryer and an instrument air storage tank. The inlet of the process air storage tank is connected to the air outlet of the compressor, and the outlet is connected to the air dryer. A tee is connected to the outlet pipe, and a tee is connected in the middle of the branch pipe, which are respectively connected to the backflush interface and air blow interface of the filter press. An air blow diaphragm valve and an air blow valve are installed on the branch pipe.

Images