Diaphragm plate-and-frame filter press system with vacuum reset function

Abstract

The invention relates to the technical field of filter pressing, in particular to a diaphragm plate-and-frame filter press system with a vacuum reset function. Comprising a filter press as well as a feeding system, an extrusion vacuum system, a cleaning system, a compressed air system and a discharging system which are connected with the filter press, the filter press comprises a machine body and a filter pressing plate which is connected with the inner side of the machine body in a front-back sliding manner; the plurality of filter pressing plates are positioned between the front end plate and the rear end plate; the adjacent filter pressing plates are contacted and sealed; the filter pressing plate is in contact sealing with the end plate; the rear end plate is fixedly connected with the rear inner wall of the machine body, and the front side of the front end plate abuts against an output shaft of the press. The stirring block is driven by the square rod to rotate, so that the thicker position on the stirring block is quickly inserted between the adjacent stirring pieces under the condition that the plurality of filter pressing plates need to be unfolded, the plurality of filter pressing plates and the two end plates can be quickly separated, a filter cake can be quickly discharged, and compared with an existing discharging mode, the discharging efficiency is greatly improved. And the working efficiency of the filter press system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure filtration, and more specifically, to a diaphragm plate and frame pressure filter system with a vacuum reset function. Background Art

[0002] A diaphragm plate and frame pressure filter is a device for solid-liquid separation, which is composed of rigid filter plates and diaphragm filter plates arranged alternately. The rigid filter plates have a certain strength and are used to support the entire structure and form a filter chamber; the diaphragm filter plates are equipped with expandable diaphragms, which play an important role in the pressure filtration process. During operation, the material enters the filter chamber under pressure, the liquid passes through the filter cloth and is discharged, and the solid particles are intercepted in the filter chamber to form a filter cake, thereby achieving solid-liquid separation. The diaphragm plate and frame pressure filter adopts a modular design and has the characteristics of good sealing, high-efficiency filtration, simple operation, and strong adaptability, and is widely used in many industries such as chemical industry, pharmacy, food, environmental protection, mining, metallurgy, ceramics, textile, papermaking, and petroleum.

[0003] The material enters the filter chamber in the pressure filter through a feed pump. The liquid will pass through the filter cloth and flow out, while the solid particles are intercepted in the filter chamber to form a filter cake. As the feeding progresses, the filter cake gradually thickens, and the resistance of the liquid passing through the filter cloth increases. However, under the action of the feeding pressure, the liquid continues to pass through the filter cloth and is discharged, and the solid particles continue to accumulate, initially achieving solid-liquid separation. After the feeding is completed, liquid is introduced into the diaphragm cavity in the pressure filter to make the diaphragm expand and squeeze the filter cake, further squeezing out the moisture in the filter cake; after pressure filtration, it is necessary to use a plate pulling device to pull open the filter cake one by one to realize the discharging of the filter cake; since the filter plates need to be pulled open one by one during discharging, the operation process is cumbersome and time-consuming. Especially for large-scale production or the situation of processing a large amount of materials, this one-by-one discharging method seriously affects the overall production efficiency and increases the production cycle; in addition, after the diaphragm of a common diaphragm plate and frame pressure filter is squeezed, the diaphragm automatically resets, which takes a long time and is prone to the situation of incomplete recovery, which will affect the subsequent feeding volume and pressing effect. Summary of the Invention

[0004] In order to make up for the deficiencies of the prior art, the present invention proposes a diaphragm plate and frame pressure filter system with a vacuum reset function. The present invention drives a dial to rotate through a square rod, so that the thicker position on the dial quickly inserts between adjacent tabs when multiple filter plates need to be unfolded, so that multiple filter plates and two end plates can be quickly separated, realizing the rapid discharge of the filter cake. Compared with the existing discharging method, the working efficiency of the pressure filter system is improved.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: A diaphragm plate and frame filter press system with a vacuum reset function described in the present invention 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 machine body and filter plates slidably connected to the inner side of the machine body before and after; a plurality of the filter plates are located between two end plates at the front and rear; adjacent filter plates are in contact and sealed; the filter plates are in contact and sealed with the end plates; the end plate at the rear position is fixedly connected to the inner wall at the rear of the machine body, and the front side of the end plate at the front position abuts against the output shaft of the press; the upper surfaces of the filter plates and the end plates are fixedly connected with paddles; there are sliders between the adjacent paddles before and after; the front and rear cross-sections of the slider are circular; the front and rear thicknesses of the slider are variably arranged in the circumferential direction; a square groove is penetrated through the center of the slider before and after; the square grooves on all the sliders pass through and are slidably connected with a square rod; the rear end of the square rod is fixedly connected to the output shaft of the motor on the inner wall at the rear of the machine body.

[0006] Preferably, a filter groove is provided at the rear side of the filter plate; a filter frame is provided inside the filter groove; a filter cloth is fixedly connected inside the filter frame; the filter cloth divides the filter groove into a rear filter chamber and a front drainage chamber; a drain pipe is penetrated downward through the drainage chamber; the filter plate and the end plate at the rear position are penetrated through before and after with a first feed hole; the first feed hole is communicated with the filter chamber through a second feed hole; a membrane groove is provided at the front side of the filter plate; an elastic membrane is fixedly connected inside the membrane groove; a diaphragm chamber is formed between the elastic membrane and the bottom of the membrane groove; a first liquid inlet hole communicated with the diaphragm chamber is provided on the side surface of the filter plate; the first liquid inlet hole is rotatably connected with a communicating pipe; the communicating pipes adjacent before and after are communicated through an extension pipe.

[0007] Preferably, the filter frame is slidably and sealingly connected inside the filter groove; a push groove is provided at the bottom of the filter groove; a push bar is slidably and sealingly connected inside 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 communicated with the diaphragm chamber through a second liquid inlet hole.

[0008] Preferably, the number of the square rods and the motors is at least two; the adjacent two sliders in the front and rear directions are staggered in the left and right directions of the machine body; the adjacent two sliders in the front and rear directions are connected to different square rods.

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

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

[0011] Preferably, a tension spring groove is provided at the bottom of the pushing groove; the bottom of the tension spring groove is connected to the pushing bar by a first tension spring; the pulling force of the first tension spring is less than the pulling force of the elastic cord.

[0012] Preferably, a shielding groove is provided at the bottom of the filter groove near the second feeding 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 feeding hole as the filter frame moves.

[0013] Preferably, the feeding system includes a conditioning tank and a feeding pump connected to the conditioning tank through a pipeline; the outlet of the feeding pump is connected to the first feeding hole on the filter press through a pipeline; a feeding valve is provided on the outlet pipeline of the feeding pump, and a tee is connected after the feeding valve. The branch pipe is used as a return pipe and connected back to the conditioning tank, and a return valve is provided on the return pipe; The extrusion vacuum system includes a water tank, an extrusion pump, and a vacuum pump; the water inlet of the extrusion pump is connected to the 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 pipeline of the extrusion pump, and a tee is connected after the extrusion valve. The branch pipe of the tee is used as a return water pipe and connected back to the water tank, and a diaphragm pressure relief valve is provided on the return water pipe. The inlet of the vacuum pump is connected to the return water pipe, and a vacuum pumping valve is provided before the inlet. The outlet pipe of the vacuum pump is connected into the drainage hook; The discharging 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 water tank. The inlet of the cleaning pump is connected to the water tank, and the outlet is connected to the cleaning interface of the filter press. A tee is connected before the cleaning interface of the filter press, and the branch pipe is connected to the backwashing pipeline, and a water blowing valve is provided on the branch pipe; The compressed air system includes an air compressor, a process gas storage tank, an air dryer, and an instrument gas storage tank. The inlet of the process gas storage tank is connected to the 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 backwashing interface and the air blowing interface of the filter press, and an air blowing diaphragm valve and an air blowing valve are provided on the branch pipe.

[0014] The beneficial effects of the present invention are as follows: 1. In the present invention, the square rod drives the dial to rotate, so that the thicker position on the dial quickly inserts between adjacent dial pieces when multiple filter plates need to be unfolded, so that multiple filter plates and two end plates can be quickly separated, realizing the rapid discharge of the filter cake. Compared with the existing discharging method, the working efficiency of the filter press system is improved. <X

[0015] 2. In the present invention, the materials in the filter chamber are all squeezed by the filter cloth and the elastic membrane, that is to say, the materials in the filter chamber are squeezed on both the front and back sides. Compared with the single-sided squeezing of the materials in the filter chamber, the dehydration effect of the materials is better; in the filter cake discharging stage, after the liquid medium in the pushing groove increases, it will push the push bar and the filter frame to move. The filter frame will drive the filter cloth to move away from the bottom of the filter groove and move backward. The volume of the filter chamber becomes smaller, and the filter cake in the filter chamber is pushed out by the filter cloth and the filter frame, making the filter cake fall more smoothly.

[0016] 3. In the present invention, the dial block rotates cyclically, so that the thickness of the dial block stuck into the adjacent dial pieces changes. The tension of the second tension spring is transmitted to the filter pressing plate and the end plate, making the adjacent dial pieces approach each other, so that all the filter pressing plates and the ends will approach and contact each other. During the contact process of multiple filter pressing plates and end plates, impacts are formed, so that the filter cake in the filter chamber is loosened under the impact. When the filter chamber is opened again, the loosened filter cake can quickly fall from the exposed filter chamber, making the falling of the filter cake after filter pressing more smooth.

[0017] 4. In the present invention, the filter frame drives the filter cloth to push out the filter cake in the filter chamber. The elastic force of the elastic cord inside the elastic membrane becomes smaller closer to the center, so the elastic membrane bulges in an arc. In this way, during the process of the two filter pressing plates approaching and colliding with each other, the arc-shaped bulging elastic membrane is more likely to break the filter cake, making the filter cake easier to fall off after fragmentation; during the process of new materials entering the filter chamber, since the residual materials in the second feeding hole are not squeezed and compacted by the second diaphragm chamber, the residual materials in the second feeding hole can smoothly enter the filter chamber under the push of the new materials in the first feeding hole, ensuring the smooth progress of material filter pressing.

[0018] 5. In the present invention, a negative pressure is generated by using a vacuum pump to assist the diaphragm chamber to quickly reset after pressing. The reset time can be shortened to within 1 minute, improving the continuous operation efficiency of the equipment; the negative pressure reset drives the elastic membrane to retract through a uniform adsorption force, and the elastic membrane resets completely. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 is a schematic diagram of the system of the present invention; Figure 2 is a partial three-dimensional view of the filter press in the present invention; Figure 3 is a three-dimensional view of multiple filter pressing plates and two end plates in the present invention; Figure 4 is Figure 3 the enlarged view of part A in Figure 5 is a three-dimensional view of a single filter pressing plate in the present invention; Figure 6It is a perspective view of another structure of the connecting pipe and the extension pipe in the present invention; Figure 7 It is Figure 5 a perspective view from another angle; Figure 8 It is a perspective view of the shielding groove and the shielding piece in the present invention; Figure 9 It is a cross-sectional view of two filter pressing plates combined in the present invention; Figure 10 It is Figure 9 an enlarged view of part B in

[0021] In the figure: water blowing valve 11, air blowing diaphragm valve 12, air blowing valve 13, chain plate 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 pumping valve 33, vacuum pump 34, extrusion valve 35, extrusion pump 36, cleaning pump 37, air compressor 41, process gas storage tank 42, air dryer 43, instrument gas storage tank 44, machine body 5, press 51, filter pressing plate 6, first liquid inlet hole 60, filter tank 61, filter cavity 611, drainage cavity 612, drain pipe 613, shielding groove 614, first feed hole 62, second feed hole 63, membrane tank 64, connecting pipe 65, extension pipe 651, pushing groove 66, pushing bar 661, tension spring groove 662, first tension spring 663, second liquid inlet hole 67, avoiding groove 68, second tension spring 681, shielding piece 69, end plate 7, dial 71, dial block 72, square groove 721, square rod 73, motor 74, filter frame 8, filter cloth 81, elastic membrane 9, diaphragm cavity 91, elastic cord 92. Detailed implementation manners

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0023] As Figures 1 to 10 shown, the present invention includes the following embodiments: Embodiment 1: A diaphragm plate and frame filter press system with a vacuum reset function, including 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 5 and filter plates 6 slidably connected to the inner side of the body 5 in the front and rear directions; a plurality of the filter plates 6 are located between two end plates 7 at the front and rear; adjacent filter plates 6 are in contact and sealed; the filter plates 6 are in contact and sealed with the end plates 7; the end plate 7 at the rear position is fixedly connected to the inner rear wall of the body 5, and the front side of the end plate 7 at the front position abuts against the output shaft of the press 51; the upper surfaces of the filter plates 6 and the end plates 7 are fixedly connected with paddles 71; there are blocks 72 between adjacent paddles 71 in the front and rear; the front and rear cross-sections of the block 72 are circular; the front and rear thicknesses of the block 72 are variably arranged in the circumferential direction; a square groove 721 runs through the front and rear of the center of the block 72; the square grooves 721 on all the blocks 72 pass through and are slidably connected to a square rod 73; the rear end of the square rod 73 is fixedly connected to the output shaft of a motor 74 on the inner rear wall of the body 5.

[0024] A plurality of filter plates 6 and the front and rear end plates 7 can slide in the front and rear directions inside the body 5. The press 51 is located on the front side of the plurality of filter plates 6. The block 72 is always located between the gaps of two adjacent paddles 71. The front and rear thicknesses of the block 72 are variably arranged in the circumferential direction and have two thickness limit points. The position where the thickness of the block 72 is the largest is called the first limit point, and the position where the thickness of the block 72 is the smallest is called the second limit point. If it is necessary to fold a plurality of filter plates 6 close to each other, it is necessary to control the motor 74 to drive the square rod 73 to rotate. The square rod 73 will drive a plurality of blocks 72 to rotate, so that the second limit point of the block 72 is located between adjacent paddles 71. The minimum distance between adjacent paddles 71 is greater than the thickness of the second limit point of the block 72. Subsequently, push the press 51 to drive the front end plate 7 to move backward. During the backward movement of the front end plate 7, it will squeeze a plurality of filter plates 6 to move backward. In this way, a plurality of filter plates 6 and the two end plates 7 on the front and rear sides are pressed against the inner rear position of the body 5. After the adjacent filter plates 6 are pressed, they are in contact and sealed, and the filter plates 6 are also in contact and sealed with the end plates 7. Subsequently, the material is injected 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, realizing the preliminary dehydration of the material. Subsequently, stop feeding, pump the liquid into the diaphragm cavity 91 in the filter press. The expansion of the diaphragm cavity 91 will squeeze the materials in the filter cavity 611, enabling further dehydration of the materials in the filter cavity 611. After the water in the materials in the filter cavity 611 is squeezed out, filter cakes are formed. Then, after controlling the diaphragm cavity 91 to deflate, control the output shaft of the press 51 to shorten, releasing the extrusion restriction on the multiple filter plates 6 and the two end plates 7. Subsequently, rotate the motor 74 to drive the square rod 73 to rotate. During the rotation of the square rod 73, it will drive the multiple sliders 72 to rotate. During the rotation of the sliders 72, it will drive the first limit point to move between adjacent slats 71. In this way, the distance between adjacent slats 71 increases and they move away from each other under the push of the first limit point of the slider 72. During the process of adjacent slats 71 moving away from each other, they will drive the filter plates 6 to slide forward inside the machine body 5, causing all the filter plates 6 and the end plates 7 to unfold, such that the end plate 7 at the rear position is separated from the contact with the filter plate 6, adjacent filter plates 6 are separated from the contact, and the end plate 7 at the front position is separated from the contact with the filter plate 6. In this way, the filter cavity 611 is exposed, and the filter plates in the filter cavity 611 fall off after being exposed, realizing the rapid discharging of the filter cakes. During the process of the multiple filter plates 6 and the end plates 7 unfolding, the square grooves 721 on the corresponding slats 71 will slide with the square rod 73, and all the slats 71 will move forward along the square rod 73; After the filter cakes are discharged, rotate the motor 74 again to drive the square rod 73 to rotate. The square rod 73 will drive the second limit point on the slider 72 to turn between adjacent slats 71, thus preventing the first limit point located on the adjacent slats 71 from affecting the folding of the multiple filter plates 6. Subsequently, push the press 51 to drive the multiple filter plates 6 and the two end plates 7 to gather and fold backward. The slider 72 will move backward along the square rod 73. After the press 51 compresses the multiple filter plates 6 and the two end plates 7, control the feeding of the filter cavity 611 again, and so on; In the present invention, the square rod 73 drives the slider 72 to rotate, enabling the thicker position on the slider 72 to quickly insert between adjacent slats 71 when the multiple filter plates 6 need to unfold. As a result, the multiple filter plates 6 and the two end plates 7 can be quickly separated, realizing the rapid discharging of the filter cakes. Compared with the existing discharging methods, the working efficiency of the filter press system is improved.

[0025] Embodiment 2: A filter tank 61 is provided at the rear side of the filter press plate 6; a filter frame 8 is arranged inside the filter tank 61; a filter cloth 81 is fixedly connected inside 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 drain pipe 613 is vertically and penetratingly arranged in the drainage chamber 612; a first feed hole 62 is penetratingly arranged through the filter press plate 6 and the end plate 7 at the rear position; the first feed hole 62 is communicated with the filter chamber 611 through a second feed hole 63; a membrane tank 64 is arranged at the front side of the filter press plate 6; an elastic membrane 9 is fixedly connected in the membrane tank 64; a diaphragm chamber 91 is formed between the elastic membrane 9 and the bottom of the membrane tank 64; a first liquid inlet hole 60 communicated with the diaphragm chamber 91 is arranged on the side surface of the filter press plate 6; the first liquid inlet hole 60 is rotatably connected with a communicating pipe 65; the communicating pipes 65 adjacent to each other front and back are communicated through an extension pipe 651.

[0026] The filter frame 8 is slidably and sealingly connected in the filter tank 61; a push groove 66 is arranged at the bottom of the filter tank 61; a push bar 661 is slidably 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 communicated with the diaphragm chamber 91 through a second liquid inlet hole 67.

[0027] After multiple filter pressing plates 6 and two end plates 7 are folded backward and pressed by a press 51, when one of the connecting pipes 65 is connected to a vacuum pump 34, creating a negative pressure in one of the connecting pipes 65, all of the connecting pipes 65 will form a negative pressure. The liquid medium in the pushing 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 pushing bar 661 will move closer to the bottom of the pushing groove 66. The pushing bar 661 will drive the filter frame 8 to move closer to the bottom of the filter groove 61 along the filter groove 61. The filter frame 8 will drive the filter cloth 81 to move closer to the bottom of the filter groove 61, causing the second feeding hole 63 to communicate with the filter cavity 611. Additionally, the diaphragm cavity 91 will be in a shriveled state. Subsequently, the first feeding hole 62 is controlled to feed. The material enters the second feeding hole 63 along the first feeding hole 62 and finally flows into the filter cavity 611. As the material in the filter cavity 611 increases, the moisture contained in the material is pressed through the filter cloth 81 and enters the drainage cavity 612, and finally is discharged along the drain pipe 613, achieving preliminary dehydration of the material in the filter cavity 611. Subsequently, the feeding of the first feeding hole 62 is stopped, and the connecting pipe 65 is controlled to feed liquid. The liquid medium will enter the first liquid inlet hole 60 along the connecting pipe 65. The liquid medium in the first liquid inlet hole 60 will enter the diaphragm cavity 91, causing the elastic membrane 9 to expand and bulge forward. During the forward bulging of the elastic membrane 9, it can squeeze the material in the filter cavity 611 at the front side position. The liquid medium in the diaphragm cavity 91 will enter the pushing groove 66 along the second liquid inlet hole 67. The liquid medium in the pushing groove 66 will push the pushing bar 661 away from the pushing groove 66. The pushing 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 cloths 81, they will squeeze the material in the filter cavity 611. Except for the filter cavity 611 in contact with the end plate 7 at the rearmost side, the material in other filter cavities 611 will be squeezed by the filter cloth 81 and the elastic membrane 9. That is to say, 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; After the secondary pressure filtration is completed, after controlling the liquid in the push groove 66 and the diaphragm cavity 91 to be pumped away, control the multiple filter plates 6 and the two end plates 7 to separate from 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 completely, control the connecting pipe 65 to introduce a liquid medium. 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. After the liquid medium in the push groove 66 increases, it will push the push bar 661 and the filter frame 8 to move. The filter frame 8 will drive the filter cloth 81 to move away from the bottom of the filter groove 61 and move backward. The volume of the filter cavity 611 becomes smaller, and the filter cake in the filter cavity 611 is pushed out by the filter cloth 81 and the filter frame 8, making the filter cake fall off more smoothly; after the filter cake is discharged, a new round of material pressure filtration is carried out. Specifically, control the multiple filter plates 6 and the two end plates 7 to fold backward together. After the medium in the push groove 66 and the diaphragm cavity 91 flows away, then control the new material to push the old material remaining in the first feed hole 62 into the filter cavity 611 for re-pressure filtration, and so on.

[0028] Embodiment 3: The number of the square rods 73 and the motors 74 is at least two; two adjacent dial blocks 72 in the front-back direction are arranged offset in the left-right direction of the machine body 5; two adjacent dial blocks 72 in the front-back direction are connected to different square rods 73.

[0029] The end plate 7 at the front position and the corresponding filter plate 6, between adjacent filter plates 6, and the end plate 7 at the rear position and the corresponding filter plate 6 are connected by a second tension spring 681; avoiding grooves 68 are provided on the front and rear side walls of the filter plate 6; the second tension spring 681 is located in the avoiding groove 68.

[0030] By staggering the adjacent shifting blocks 72 in the front-back direction in the left-right direction of the machine body 5, the upper limit of the thickness of the shifting blocks 72 in the front-back direction is increased, so that the adjacent paddles 71 are pushed apart further at the first limit point of the shifting blocks 72. When it is necessary to control a plurality of filter plates 6 and two end plates 7 to be folded backward together, it is necessary to control the rotation of the shifting blocks 72 to drive the second limit point to move between the adjacent paddles 71 to meet the folding requirements of the plurality of filter plates 6 and the two end plates 7. When cake discharging is required, only rotate all the square rods 73, so that all the square rods 73 drive the shifting blocks 72 to rotate in a cycle. The shifting blocks 72 will drive the first limit point to enter between the adjacent paddles 71. The shifting blocks 72 rotate in a cycle, so that the thickness of the shifting blocks 72 stuck between the adjacent paddles 71 changes. When the thickness of the shifting blocks 72 stuck between the adjacent paddles 71 increases, the adjacent paddles 71 will move away from each other, so that all the filter plates 6 and the end plates 7 are separated and move away from each other. When the thickness of the shifting blocks 72 stuck between the adjacent paddles 71 decreases, the pulling force of the second tension spring 681 will be transmitted to the filter plates 6 and the end plates 7, so that the adjacent paddles 71 will move closer to each other, so that all the filter plates 6 and the end parts will move closer to each other and contact. During the contact process of the plurality of filter plates 6 and the end plates 7, impacts are formed, so that the filter cake in the filter chamber 611 is loosened under the impact. When the filter chamber 611 is opened again, the loosened filter cake can quickly fall from the exposed filter chamber 611, so that the discharged filter cake after pressure filtration falls off more smoothly; after the discharge of the filter cake is completed, control the plurality of filter plates 6 and the two end plates 7 to be folded backward together. The second tension spring 681 plays a role in pulling and approaching the plurality of filter plates 6 and the end plates 7. The second tension spring 681 will enter the avoidance groove 68 for avoidance to ensure the sealing contact effect of the filter plates 6 and the end plates 7.

[0031] Embodiment 4: The inner wall of the elastic membrane 9 and the bottom of the membrane groove 64 are connected by an elastic cord 92; the diameter of the elastic cord 92 decreases as it approaches the center of the elastic membrane 9.

[0032] A tension spring groove 662 is arranged at the bottom of the pushing groove 66; the bottom of the tension spring groove 662 and the pushing bar 661 are connected by a first tension spring 663; the pulling force of the first tension spring 663 is less than the pulling force of the elastic cord 92.

[0033] A shielding groove 614 is arranged at the bottom of the filter groove 61 near the position of the second feed hole 63; a shielding piece 69 is slidably connected in the shielding groove 614; the shielding piece 69 is fixedly connected to the filter frame 8; the shielding piece 69 can shield the second feed hole 63 as the filter frame 8 moves.

[0034] After multiple filter pressing plates 6 and two end plates 7 are pressed together, control the first liquid inlet hole 60 to form a negative pressure. The liquid pressure in the push groove 66 and the diaphragm cavity 91 will gradually decrease. The filter frame 8 will drive the filter cloth 81 to approach the bottom of the filter groove 61 under the pull of the first tension spring 663. The filter frame 8 will drive the shielding piece 69 to move away from the opening position of the second feeding hole 63. The opening of the second feeding hole 63 is in the shape of a flat groove. After the shielding piece 69 moves away, the second feeding hole 63 communicates with the filter cavity 611. The liquid in the diaphragm cavity 91 will also flow away along the first liquid inlet hole 60 under the pull of the elastic cord 92, causing the elastic membrane 9 to deflate. Subsequently, control the first feeding hole 62 and the second feeding hole 63 to feed materials. After the materials in the filter cavity 611 increase, the excess water in the materials will flow away through the filter cloth 81. Then stop feeding, control the first liquid inlet hole 60 to flow in a liquid medium. The liquid medium enters the push groove 66 along the diaphragm cavity 91 and the second liquid inlet hole 67. Since the pulling force of the first tension spring 663 is less than the pulling force of the elastic cord 92, the liquid medium in the push groove 66 will push the push bar 661 away from the bottom of the push groove 66 before the elastic membrane 9 bulges. The push bar 661 will drive 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 will drive the shielding piece 69 to block the second feeding hole 63, disconnecting the second feeding hole 63 from the filter cavity 611, so as to prevent the materials in the subsequent filter cavity 611 from being secondarily squeezed and compacted, causing the materials in the connected second feeding hole 63 to be overly compacted and reducing the probability of material jamming in the second feeding hole 63. As the filter cloth 81 pushes the materials in the filter cavity 611 away from the corresponding filter groove 61 and approaches the contact with the elastic membrane 9 on the rear side, the speed at which the push bar 661 moves away from the push groove 66 slows down. 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 materials in the front filter cavity 611, causing the materials to be pressure-filtered in the space of the filter cavity 611 that is separated from the second feeding hole 63. During the secondary pressure filtration process of the materials in the filter cavity 611, the excess liquid flows away through the filter cloth 81; The material in the filter chamber 611 forms a filter cake after two - stage pressure filtration. After the press 51 releases the front - end plate 7, the control block 72 is rotated to make the multiple filter plates 6 and the end plate 7 move away from each other, exposing the filter chamber 611. The control is such that the push groove 66 and the diaphragm chamber 91 are further filled with liquid. The filter frame 8 drives the filter cloth 81 to push out the filter cake in the filter chamber 611. The elastic force of the elastic ropes 92 inside the elastic membrane 9 is smaller closer to the center, so the elastic membrane 9 bulges in an arc. Thus, during the process of the two filter plates 6 approaching and colliding with each other, the arcuately - bulging elastic membrane 9 is more likely to break the filter cake, making it easier for the filter cake to fall off after fragmentation. After the filter cake is unloaded, the multiple filter plates 6 and the two end plates 7 are controlled to move backward and fold again. After the liquid in the push groove 66 and the diaphragm chamber 91 flows out, the elastic membrane 9 and the filter frame 8 are reset, and the second feed hole 63 is connected to the filter chamber 611 again. Since the residual material in the second feed hole 63 is not compacted by the extrusion of the diaphragm chamber 91, the residual material in the second feed hole 63 can enter the filter chamber 611 more smoothly under the push of the new material in the first feed hole 62, ensuring the smooth progress of material pressure filtration.

[0035] 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. After the feed valve 23, a tee is connected. The branch pipe serves as a return pipe and is connected back to the conditioning tank 21, and a return valve 22 is provided on the return pipe; The extrusion - vacuum system includes a water tank 31, an extrusion pump 36, and a vacuum pump 34; the water inlet of the extrusion pump 36 is connected to the water tank 31 through 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. After the extrusion valve 35, a tee is connected. The branch pipe of the tee serves as a return pipe and is connected back to the water tank 31, 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 - extraction valve 33 is provided before the inlet. The outlet pipe of the vacuum pump 34 is connected to the drain hook; The discharging system includes a chain - plate conveyor 14 and a lifting conveyor 15. The chain - plate conveyor 14 is placed directly below the filter press, and the lifting conveyor 15 is connected to the end of the chain - plate conveyor 14; The cleaning system includes a cleaning pump 37 and a water tank 31. The inlet of the cleaning pump 37 is connected to the water tank 31, and the outlet is connected to the cleaning interface of the filter press (not shown in the figure). Before the cleaning interface of the filter press, a tee is connected, and the branch pipe is connected to the back - blowing pipeline, and a water - blowing valve 11 is provided on the branch pipe; The compressed air system includes an air compressor 41, a process gas storage tank 42, an air dryer 43, and an instrument gas storage tank 44. The inlet of the process gas storage tank 42 is connected to the outlet of the compressor, and the outlet is connected to the air dryer 43. A tee is connected to the outlet pipe, and another tee is connected in the middle of the branch pipe, which are respectively connected to the backwash 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.

[0036] The material is added to the conditioning tank 21 for stirring and conditioning. After feeding, the feeding valve 23 and the feeding pump 24 are opened simultaneously to pump the material into the first feeding hole 62 in the filter press. After the feeding pump 24 reaches the set time, it automatically stops, and the feeding valve 23 is closed at the same time. Then, the extrusion pump 36 and the diaphragm extrusion valve 35 are started to pump clear water into the diaphragm cavity 91 for extrusion dehydration. After the filter cake is discharged, the diaphragm pressure relief valve 32 is opened to naturally discharge the clear water in the diaphragm cavity 91 back to the clear water tank 31. Then, the air blow diaphragm valve 12 is opened to dry the residual moisture in the pipeline. Then, the vacuum pump 34 is started to drain the residual moisture in the diaphragm cavity 91 completely, so that the elastic membrane 9 is completely reset to start a new material filtration. The chain conveyor 14 and the lifting conveyor 15 transport the filter cake to the designated position. In this embodiment, the vacuum pump 34 is used to generate negative pressure to assist the diaphragm cavity 91 to quickly reset after pressing. The reset time can be shortened to less than 1 minute, 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.

[0037] Example 6: The end of the connecting pipe 65 rotates and communicates with two first rotating parts; the lengthening pipe 651 is composed of two hinged pipes hinged and communicated. One of the hinged pipes communicates with the inside of the first rotating part on the connecting pipe at the adjacent front position, and the other hinged pipe communicates with the inside of the first rotating part on the connecting pipe at the adjacent rear position (as Figure 6 )

[0038] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the attached Figure 2 shown orientation or positional relationship, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0039] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed 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, an extrusion vacuum system, a cleaning system, a compressed air system and a discharging system connected to the filter press; characterized in that: The filter press includes a machine body and filter plates that are slidably connected to the inner side of the machine body in the front and rear directions; a plurality of the filter plates are located between two end plates in the front and rear; adjacent filter plates are in contact and sealed; the filter 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 machine body, and the front side of the end plate at the front position abuts against the output shaft of the press; the upper surfaces of the filter plates and the end plates are fixedly connected with paddles; there is a block between adjacent paddles in the front and rear; the front and rear cross-sections of the block are circular; the front and rear thicknesses of the block are variably arranged in the circumferential direction; a square groove is penetrated through the center of the block in the front and rear directions; the square grooves on all the blocks pass through and are slidably connected to a square rod; the rear end of the square rod is fixedly connected to the output shaft of the motor on the rear inner wall of the machine body.

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

3. The diaphragm plate and frame filter press system with a vacuum reset function according to claim 2, characterized in that: The filter frame is slidably and sealedly connected inside the filter groove; a push groove is provided at the bottom of the filter groove; a push bar is slidably and sealedly connected inside 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 communicated with the diaphragm chamber through a second liquid inlet hole.

4. The diaphragm plate and frame filter press system with a vacuum reset function according to claim 2, characterized in that: Adjacent two blocks in the front and rear directions are staggeredly arranged in the left and right directions of the machine body; adjacent two blocks in the front and rear directions are connected to different square rods.

5. The diaphragm plate and frame filter press system with vacuum reset function according to claim 4, wherein: The front end plate and the corresponding filter plate, adjacent filter plates, and the rear end plate and the corresponding filter plate are connected by a second tension spring; avoidance grooves are provided on the front and rear side walls of the filter plate; the second tension spring is located in the avoidance groove.

6. The diaphragm plate and frame filter press system with a vacuum reset function according to claim 3, wherein: The inner wall of the elastic membrane and the bottom of the membrane groove are connected by an elastic cord; the diameter of the elastic cord decreases as it approaches the center of the elastic membrane.

7. The diaphragm plate and frame filter press system with a vacuum reset function according to claim 6, wherein: 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 by a first tension spring; the tension of the first tension spring is less than the tension of the elastic cord.

8. The diaphragm plate and frame filter press system with vacuum reset function according to claim 7, wherein: A shielding groove is provided at the position of the bottom of the filter groove near the second feed hole; a shielding piece is slidably connected inside the shielding groove; the shielding piece is fixedly connected with the filter frame; the shielding piece can shield the second feed hole as the filter frame moves.

9. The diaphragm plate and frame filter press system with a vacuum reset function as described in claim 1, wherein: The feeding system includes a conditioning tank and a feed pump communicated with 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, and a tee is connected behind the feed valve, and a branch pipe is used as a return pipe to connect back to the conditioning tank, and a return valve is provided on the return pipe; The extrusion vacuum system includes a clear water tank, an extrusion pump, and a vacuum pump; the water inlet of the extrusion pump is connected to the clear 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, and a tee is connected after the extrusion valve. The branch pipe of the tee is used as a return water pipe and is connected back to the clear water tank. A diaphragm pressure relief valve is provided on the return water pipe. The inlet of the vacuum pump is connected to the return water pipe, and a vacuum extraction valve is provided before the inlet. The outlet pipe of the vacuum pump is connected into the drainage hook; The discharging 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 clear water tank. The inlet of the cleaning pump is connected to the clear water tank, and the outlet is connected to the cleaning interface of the filter press. A tee is connected before the cleaning interface of the filter press, and the branch pipe is connected to the backwashing pipeline. A water blowing valve is provided on the branch pipe; The compressed air system includes an air compressor, a process gas storage tank, an air dryer, and an instrument gas storage tank. The inlet of the process gas storage tank is connected to the outlet of the compressor, and the outlet is connected to the air dryer. A tee is connected to the outlet pipe, and another tee is connected in the middle of the branch pipe, which are respectively connected to the backwashing interface and the air blowing interface of the filter press. An air blowing diaphragm valve and an air blowing valve are provided on the branch pipe.

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