Bi-directional extrusion filtration device, filter press and its filter pressing method

Abstract

The present invention relates to the technical field of sludge pressure filtration, specifically a two-way extrusion filtration device, a filter press and its pressure filtration method, including: at least two groups of filter press frame plates, the inside of the filter press frame plates is a hollow structure and there is an opening on one side and a pressure filtration surface on the other side; a pressure filtration member, slidably arranged on the filter press frame plates, when the pressure filtration member moves towards the outside of the filter press frame plates, it can cooperate with the pressure filtration surfaces on the adjacent filter press frame plates for pressure filtration; a screw propelling member, arranged in the middle of the pressure filtration member, and there are bumps formed on one side of the screw propelling member; a rotating assembly, connecting the screw propelling member and the filter press frame plates, the screw assembly can drive the screw propelling member to rotate when the pressure filtration member cooperates with the pressure filtration surfaces; a scraper, arranged inside the filter press frame plates and attached to the inner side of the pressure filtration surface; a two-way guiding assembly, connecting the scraper and the pressure filtration member, the two-way guiding assembly can make the scraper move along the length direction of the pressure filtration surface when the pressure filtration member moves to a predetermined position, reducing the size of the pressure filtration bag after pressure filtration.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge pressure filtration, and specifically to a bidirectional extrusion filtration device, a filter press and a pressure filtration method thereof. Background Art

[0002] With the acceleration of the urbanization process and the rapid development of population growth, the discharge of domestic sewage and industrial wastewater is increasing, and sludge treatment has become an important task for environmental protection.

[0003] A sludge filter press is a mechanical device widely used in the dehydration treatment of industrial sludge. It realizes filtration by applying mechanical force on one side, and is mainly used for the solid-liquid separation of sludge. The sludge filter press can convert sludge containing pollutants such as organic matter, microorganisms, and bacteria into stable, odorless, and easily storable and transportable solid substances, so as to reduce the emission of harmful substances and protect the environment.

[0004] During pressure filtration, the sludge is stored in a filter bag. Through the extrusion of the filter press, the water in the sludge is separated from the sludge. In this process, the filter bag can be pressed into a cake-like structure. And in order to ensure the dehydration rate of the sludge, the area of this cake-like structure is relatively large, resulting in a large space occupied by a single filter bag during storage and transportation, causing problems such as difficult storage and inconvenient transportation. Summary of the Invention

[0005] The purpose of the present invention is to provide a bidirectional extrusion filtration device, a filter press and a pressure filtration method thereof to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A bidirectional extrusion filtration device, comprising:

[0008] At least two groups of filter press frame plates, the interior of the filter press frame plates is a hollow structure, and one side is provided with an opening, and the other side is provided with a filter pressing surface;

[0009] A filter pressing member, slidably arranged on the filter press frame plate, and when the filter pressing member moves towards the outside of the filter press frame plate, it can cooperate with the filter pressing surface on the adjacent filter press frame plate to perform pressure filtration;

[0010] A screw propelling member, arranged in the middle of the filter pressing member, and a convex point is formed on one side of the screw propelling member;

[0011] A rotating assembly, connecting the screw propelling member and the filter press frame plate, and the screw assembly can drive the screw propelling member to rotate when the filter pressing member cooperates with the filter pressing surface;

[0012] A scraper, arranged inside the filter press frame plate and fitting with the inner side of the filter pressing surface;

[0013] A two-way guiding component is connected to the scraper and the pressure filtering component. When the pressure filtering component moves to a predetermined position, the two-way guiding component can make the scraper move along the length direction of the pressure filtering surface.

[0014] As a further solution of the present invention: a circular through hole is formed in the middle of the pressure filtering component, and an annular groove is provided on the inner wall of the circular through hole. An annular protrusion provided on the screw propelling component is rotationally sleeved with the annular groove.

[0015] As a still further solution of the present invention: the rotating component includes a transverse shaft installed in the pressure filtering frame plate and a sleeve shaft coaxially connected to the screw propelling component. The sleeve shaft is slidably sleeved with the transverse shaft;

[0016] A guiding groove is formed on the side wall of the sleeve shaft, and a convex shaft installed on the side part of the transverse shaft can slide in the guiding groove.

[0017] As a still further solution of the present invention: the guiding groove includes a first straight groove and a second straight groove arranged along the axial direction of the sleeve shaft. The first straight groove and the second straight groove are arranged in a staggered manner and are connected through a spiral groove.

[0018] As a still further solution of the present invention: the two-way guiding component includes a vertical rod installed in the pressure filtering frame plate. A counterweight block is slidably installed on the vertical rod. The counterweight block is connected to the scraper, and a connecting rod is provided on the counterweight block;

[0019] The two-way guiding component further includes a follower plate connected to the pressure filtering component. A driving groove surface is formed on the follower plate. A pulley rotatably installed at one end of the connecting rod away from the counterweight block can roll in the driving groove surface.

[0020] As a still further solution of the present invention: the driving groove surface includes a triangular concave area provided on the follower plate, and an inclined surface is provided on one side of the triangular concave area;

[0021] The driving groove surface further includes an extension groove and a horizontal groove provided on the follower plate. The extension groove and the horizontal groove are coaxial, and the inclined surface extends to the connection part of the extension groove and the horizontal groove;

[0022] One end of the horizontal groove is communicated with the triangular concave area, and a support member is rotatably installed at the other end. One end of the support member away from the horizontal groove abuts against the inclined surface.

[0023] A filter press includes the two-way extrusion and filtration device as described above, and further includes:

[0024] A base, on which two groups of support plates are symmetrically arranged. A horizontal rod is installed between the two groups of support plates, and the filter press frame plate is connected to the horizontal rod through a connecting piece;

[0025] A hydraulic cylinder, connecting one of the support plates and the filter press frame plate;

[0026] A filter plate, connected to the horizontal rod;

[0027] An equidistant support structure, connecting the filter plate and the filter press frame plate. When the filter press frame plates move closer to each other, the equidistant support structure can make the distance change amount between adjacent two filter press frame plates the same;

[0028] As a further scheme of the present invention: the equidistant support structure includes a lifting rod parallel to the horizontal rod. A sliding connection part is formed at the end of the lifting rod, and the sliding connection part is slidably arranged in a chute formed on the support plate;

[0029] The equidistant support structure further includes a sliding sleeve slidably installed on the lifting rod. Two connecting rods are symmetrically and rotatably installed on the sliding sleeve, and the connecting rods connect adjacent two filter press frame plates or the filter press frame plate and the filter plate.

[0030] A filter pressing method of the filter press as described above, including the following steps:

[0031] Step 1: Place the filter press bag filled with sludge between adjacent two filter press frame plates and between the filter press frame plate and the filter plate, and align the bag mouth of the filter press bag with the screw propeller;

[0032] Step 2: Control the hydraulic cylinder to act. The hydraulic cylinder will drive the filter press frame plate far from the filter plate to move towards the filter plate, and under the drive of the equidistant support structure, make the filter plate and the filter press frame plate, and the filter press frame plates approach each other equidistantly until the filter press bag is squeezed, so that the sludge can be evenly distributed in the filter press bag;

[0033] Step 3: Control the filter pressing part to move, so that the filter pressing part further moves towards the filter press bag;

[0034] Step 4: When the filter pressing part moves, the rotating assembly can drive the screw propeller to rotate, so that the bag mouth of the filter press bag rotates, tighten the filter press bag, reduce the spreading area of the filter press bag, and then the filter pressing part further moves to squeeze the filter press bag;

[0035] Step 5: After the filter pressing part moves to a predetermined position, the bidirectional guiding assembly can drive the scraper to move from top to bottom to scrape off the water droplets adhering to the inner side of the filter pressing surface;

[0036] Step 6: Reverse control the hydraulic cylinder and the filter pressing part to act, and remove the filter press bag that has completed filter pressing.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] By providing a filter pressing member, a screw propelling member and a rotating assembly, when the filter pressing member acts to press the filter pressing bag, the screw propelling member sequentially performs a linear motion, a spiral motion and a linear motion, and when the screw propelling member performs a spiral motion, the mouth of the filter pressing bag is tightened, improving the sealing performance at the mouth of the filter pressing bag, preventing the mouth of the filter pressing bag from being opened during the filter pressing process, and since the mouth of the filter pressing bag is tightened, the side of the filter pressing bag facing the filter pressing member can be rotationally tightened. At this time, the actual loading area of the filter pressing bag will decrease, and the area when the filter pressing bag is squeezed into a cake shape will decrease. On the one hand, this can make the stress more concentrated when the filter pressing member cooperates with the filter pressing surface, improving the filter pressing effect. On the other hand, it can make the cake-shaped structure after filter pressing smaller, thus facilitating subsequent storage and transportation;

[0039] By providing a scraper and a two-way guiding assembly, after the filter pressing member finishes the filter pressing action, under the action of the gravity of the counterweight, the counterweight can drive the pulley to move from the end of the horizontal groove to the triangular depression area, and at the same time, the counterweight drives the scraper to move from top to bottom to scrape off the moisture adhering to the periphery of the holes on the inner side of the filter pressing surface, preventing the filter pressing bag from deforming and resetting to re-absorb the moisture around the holes on the inner side of the filter pressing surface when the two filter pressing frame plates move away from each other to unload the filter pressing bag, improving the filter pressing effect, and the pulley can be reset in cooperation with the inclined surface and the support member, so as to ensure that when the filter pressing member performs the filter pressing action next time, the scraper can repeat the above actions;

[0040] By providing an equidistant support structure, during filter pressing, the same gap can be maintained between the filter pressing frame plates and between the filter pressing frame plates and the filter pressing plates, ensuring that during the filter pressing process, the relative positions between the filter pressing frame plates and between the filter pressing frame plates and the filter pressing plates will not change, making the filter pressing effect more consistent and preventing the gap between the filter pressing frame plates and between the filter pressing frame plates and the filter pressing plates from changing, resulting in insufficient filter pressing of a certain filter pressing bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of an embodiment of a filter press.

[0042] Figure 2 It is a schematic structural diagram of the equidistant support structure in an embodiment of a filter press.

[0043] Figure 3 It is a schematic structural diagram of one side of a filter pressing frame plate in an embodiment of a two-way extrusion filtering device.

[0044] Figure 4 It is a schematic structural diagram of the other side of a filter pressing frame plate in an embodiment of a two-way extrusion filtering device.

[0045] Figure 5 It is an exploded view of the structure of the pressure filter frame plate in an embodiment of a bi-directional extrusion filtration device.

[0046] Figure 6 It is an exploded view of the structure of the pressure filter frame plate from another angle in an embodiment of a bi-directional extrusion filtration device.

[0047] Figure 7 It is an exploded view of the structure of the rotating assembly in an embodiment of a bi-directional extrusion filtration device.

[0048] Figure 8 It is a sectional view of the pressure filter frame plate in an embodiment of a bi-directional extrusion filtration device.

[0049] Figure 9 It is a schematic structural view of the follower plate in an embodiment of a bi-directional extrusion filtration device.

[0050] In the figure: 1, base; 2, chute; 3, hydraulic cylinder; 4, horizontal rod; 5, connecting piece; 6, pressure filter frame plate; 601, pressure filtration surface; 7, pressure filter plate; 8, lifting rod; 801, sliding connection part; 9, sliding sleeve; 10, connecting rod; 11, pressure filtration part; 1101, annular groove; 12, electric telescopic rod; 13, screw propulsion part; 1301, annular protrusion; 14, sleeve shaft; 1401, first straight groove; 1402, spiral groove; 1403, second straight groove; 15, horizontal shaft; 1501, convex shaft; 16, vertical rod; 17, counterweight; 18, scraper; 19, connecting rod; 20, pulley; 21, follower plate; 2101, extension groove; 2102, horizontal groove; 2103, inclined surface; 22, support piece. Specific embodiments

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0052] In addition, an element in the present invention is referred to as being "fixed to" or "disposed on" another element, which can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0053] Please refer to Figures 3 to 9, in the embodiment of the present invention, the bi-directional extrusion and filtration device includes: at least two groups of filter press frame plates 6, a filter pressing member 11, a screw propelling member 13, a rotating assembly, a scraper 18, and a bi-directional guiding assembly. When the filter pressing member 11 acts to press the filter pressing bag, the screw propelling member 13 sequentially performs a linear motion, a spiral motion, and a linear motion. When the screw propelling member 13 performs a spiral motion, the bag mouth of the filter pressing bag is tightened, improving the sealing performance at the bag mouth of the filter pressing bag, avoiding the bag mouth of the filter pressing bag from being opened during the filtration process. And because the bag mouth of the filter pressing bag is tightened, the side of the filter pressing bag facing the filter pressing member 11 can be rotationally tightened. At this time, the actual loading area of the filter pressing bag will decrease, and the area of the filter pressing bag when it is extruded into a cake shape will decrease. On the one hand, this can make the stress more concentrated when the filter pressing member 11 cooperates with the filter pressing surface 601, improving the filtration effect. On the other hand, it can make the cake-shaped structure after filtration smaller, thus facilitating subsequent storage and transportation.

[0054] Specifically as follows: The inside of the filter press frame plate 6 is a hollow structure, and one side is provided with an opening, and the other side is provided with a filter pressing surface 601;

[0055] The filter pressing member 11 is slidably arranged in the filter press frame plate 6 and is connected to an electric telescopic rod 12 arranged in the filter press frame plate 6. When the filter pressing member 11 moves towards the outside of the filter press frame plate 6, it can cooperate with the filter pressing surface 601 on the adjacent filter press frame plate 6 to perform filtration.

[0056] During use, one of the filter press frame plates 6 can drive the connected filter pressing member 11 to move towards the filter pressing surface 601 on the adjacent filter press frame plate 6, and pre-extrude the filter pressing bag filled with sludge placed between the two filter press frame plates 6. During the pre-extrusion process, the filter pressing member 11 cooperates with the filter pressing surface 601, which can make the sludge in the filter pressing bag evenly distributed in the filter pressing bag and can initially filter the water in the sludge. Subsequently, after the filter press frame plate 6 is in place, the electric telescopic rod 12 will act and drive the filter pressing member 11 to move further towards the filter pressing surface 601 relative to the filter press frame plate 6. At this time, the filter pressing member 11 can further cooperate with the filter pressing surface 601 to perform a filtration action with a greater extrusion degree.

[0057] Please refer to Figures 5 to 7 , the screw propelling member 13 is arranged in the middle of the filter pressing member 11, and a convex point is formed on one side of the screw propelling member 13. Specifically, a circular through hole is formed in the middle of the filter pressing member 11, and an annular groove 1101 is arranged on the inner wall of the circular through hole. The annular protrusion 1301 arranged on the screw propelling member 13 is rotationally sleeved with the annular groove 1101;

[0058] The rotating assembly is connected to the spiral propulsion member 13 and the filter press frame plate 6, and the spiral assembly can drive the spiral propulsion member 13 to rotate when the filter press member 11 cooperates with the filter press surface 601;

[0059] The rotating assembly includes a transverse shaft 15 installed in the filter press frame 6 and a sleeve shaft 14 coaxially connected to the spiral propulsion member 13, and the sleeve shaft 14 is slidably fitted with the transverse shaft 15;

[0060] A guide groove is formed on the side wall of the sleeve shaft 14, and the convex shaft 1501 installed on the side of the horizontal axis 15 can slide in the guide groove. The guide groove includes a No. 1 straight groove 1401 and a No. 2 straight groove 1403 arranged along the axial direction of the sleeve shaft 14. The No. 1 straight groove 1401 and the No. 2 straight groove 1403 are staggered and connected through the spiral groove 1402.

[0061] When in use, the filter bag is placed between two filter press frame plates 6, and the bag opening of the filter bag is directed toward the spiral propeller 13. When the filter press frame plates 6 move into place, the filter press 11 will be further moved toward the filter bag under the drive of the electric telescopic rod 12. During this process, the sleeve shaft 14 moves relative to the horizontal axis 15, and the convex shaft 1501 moves relative to the guide groove. Specifically, when the convex shaft 1501 moves in the No. 1 straight groove 1401, the sleeve shaft 14 does not have a rotating state, and the spiral propeller 13 can follow the filter press 11 to move toward the filter bag. At this time, the convex point on the spiral propeller 13 can be embedded in the filter bag, and when the convex shaft 1501 moves in the spiral groove 1402 , the sleeve shaft 14 will drive the spiral propeller 13 to rotate, and drive the bag mouth of the filter bag to make a circular motion through the convex point. At this time, the bag mouth of the filter bag will be further tightened, which improves the sealing performance at the bag mouth of the filter bag, and avoids the bag mouth of the filter bag being stretched open during the filtration process. Moreover, due to the tightening of the bag mouth of the filter bag, the side of the filter bag facing the filter element 11 can be rotated and tightened. At this time, the actual containing area of ​​the filter bag will decrease, and the area of ​​the filter bag when it is squeezed into a cake shape will decrease. In this way, on the one hand, the stress when the filter element 11 and the filter surface 601 cooperate with each other can be more concentrated, thereby improving the filtration effect. On the other hand, the cake-like structure after filtration can be made smaller, thereby facilitating subsequent storage and transportation.

[0062] Among them, when the convex shaft 1501 moves to the second straight groove 1403, the sleeve shaft 14 will stop and only follow the filter element 11 to move toward the filter bag, so that the remaining filtration action can be performed, while avoiding the filter bag being tightened too much, causing deformation and cracking of the filter bag during the filtration process, thereby improving the stability of the filter bag during the filtration process.

[0063] Through the above-mentioned arrangement, when the filter element 11 moves to filter the filter bag, the spiral propeller 13 performs linear motion, spiral motion and linear motion in sequence, and when the spiral propeller 13 performs spiral motion, the bag mouth of the filter bag is tightened, thereby improving the sealing performance at the bag mouth of the filter bag and preventing the bag mouth of the filter bag from being stretched open during the filtration process. Moreover, since the bag mouth of the filter bag is tightened, the side of the filter bag facing the filter element 11 can be rotated and tightened. At this time, the actual containing area of ​​the filter bag will decrease, and the area of ​​the filter bag when it is squeezed into a cake shape will decrease. In this way, on the one hand, the stress when the filter element 11 and the filter surface 601 cooperate with each other can be more concentrated, thereby improving the filtration effect. On the other hand, the cake-like structure after filtration can be made smaller, thereby facilitating subsequent storage and transportation.

[0064] See also Figure 5 Figure 6 , Figure 8 , Figure 9 The scraper 18 is arranged in the filter press frame plate 6 and is attached to the inner side of the filter press surface 601. Specifically, a plurality of short and thin holes are formed on the filter press surface 601, which are used to allow water to flow away from the holes during filter press to achieve water separation;

[0065] The bidirectional guide assembly connects the scraper 18 and the filter press 11 , and the bidirectional guide assembly can move the scraper 18 along the length direction of the filter press surface 601 when the filter press 11 moves to a predetermined position.

[0066] The bidirectional guide assembly includes a vertical rod 16 installed in the filter press frame 6, a counterweight block 17 is slidably installed on the vertical rod 16, the counterweight block 17 is connected to the scraper 18, and a connecting rod 19 is arranged on the counterweight block 17;

[0067] The bidirectional guide assembly further includes a follower plate 21 connected to the filter press 11, and a driving groove surface is formed on the follower plate 21, and a pulley 20 rotatably mounted on the end of the connecting rod 19 away from the counterweight block 17 can roll in the driving groove surface;

[0068] The driving groove surface includes a triangular recessed area provided on the follower plate 21, and an inclined surface 2103 is provided on one side of the triangular recessed area;

[0069] The driving groove surface further includes an extension groove 2101 and a horizontal groove 2102 provided on the follower plate 21, wherein the extension groove 2101 is coaxial with the horizontal groove 2102, and the inclined surface 2103 extends to the connection between the extension groove 2101 and the horizontal groove 2102;

[0070] One end of the horizontal groove 2102 communicates with the triangular recessed area, and a support member 22 is rotatably installed at the other end. The end of the support member 22 away from the horizontal groove 2102 abuts against the inclined surface 2103.

[0071] In the initial state, the pulley 20 is at the end of the extension groove 2101 away from the horizontal groove 2102. At this time, the counterweight 17 is at the high point of the stroke. As the filter pressing member 11 performs the filter pressing operation, the filter pressing member 11 will drive the follower plate 21 to move away from the filter pressing surface 601. At this time, the follower plate 21 will move relative to the pulley 20, and the pulley 20 will move along the extension groove 2101 through the support member 22 into the horizontal groove 2102. And when the filter pressing member 11 performs the filter pressing action, the water in the filter pressing bag will enter the inside of the filter pressing surface 601 through the holes on the filter pressing surface 601, and then flow out of the filter pressing frame plate 6 along the inside of the filter pressing surface 601. When the filter pressing member 11 finishes the filter pressing action, when the pulley 20 just moves to the end of the horizontal groove 2102, at this time, under the action of the counterweight 17, the scraper 18 will move downward from top to bottom along the length direction of the vertical rod 16 to scrape off the water adhering to the periphery of the holes on the inside of the filter pressing surface 601, so as to prevent the filter pressing bag from resetting and deforming to reabsorb the water around the holes on the inside of the filter pressing surface 601 when the two filter pressing frame plates 6 move away from each other to unload the filter pressing bag, and improve the filter pressing effect.

[0072] It should be noted that when the electric telescopic rod 12 drives the filter pressing member 11 to move towards the inside of the filter pressing frame plate 6, the follower plate 21 will also move accordingly. At this time, the pulley 20 will move along the length direction of the inclined surface 2103, and the pulley 20 can drive the counterweight 17 and the scraper 18 to move upward through the connecting rod 19. When the pulley 20 moves to the end of the inclined surface 2103, the pulley 20 can abut against the support member 22 and drive the support member 22 to deflect. At the same time, when the pulley 20 further moves, it can move into the extension groove 2101. At this time, the gravity of the support member 22 automatically resets, and then when the filter pressing member 11 performs the filter pressing action next time, the scraper 18 can repeat the above actions to ensure that when unloading the filter pressing bag, the scraper 18 can perform a water scraping action on the inside of the filter pressing surface 601 once.

[0073] Through the above settings, after the pressure filtration member 11 completes the pressure filtration action, under the action of the gravity of the counterweight 17, the counterweight 17 can drive the pulley 20 to move from the end of the horizontal groove 2102 to the triangular recessed area. At the same time, the counterweight 17 drives the scraper 18 to move from top to bottom to scrape off the moisture adhering to the periphery of the holes on the inner side of the pressure filtration surface 601, so as to prevent the pressure filtration bag from resetting and deforming to re-absorb the moisture around the holes on the inner side of the pressure filtration surface 601 when the two pressure filtration frame plates 6 move away from each other to unload the pressure filtration bag, improving the pressure filtration effect. And the pulley 20 can be reset in cooperation with the inclined surface 2103 and the support member 22, so as to ensure that when the pressure filtration member 11 performs the pressure filtration action next time, the scraper 18 can repeat the above actions.

[0074] Please refer to Figures 1 to 2 , as an embodiment of the present invention, a filter press is further proposed, including the bidirectional extrusion filtration device described above, and further including: a base 1, a hydraulic cylinder 3, a filter plate 7, and an equidistant support structure.

[0075] Two groups of support plates are symmetrically arranged on the base 1, and a horizontal rod 4 is installed between the two groups of support plates. The pressure filtration frame plate 6 is connected to the horizontal rod 4 through a connecting member 5;

[0076] The hydraulic cylinder 3 is connected to one of the support plates and the pressure filtration frame plate 6;

[0077] The filter plate 7 is connected to the horizontal rod 4;

[0078] The equidistant support structure connects the filter plate 7 and the pressure filtration frame plate 6. The equidistant support structure can make the distance change amount between adjacent two pressure filtration frame plates 6 the same when the pressure filtration frame plates 6 move closer to each other;

[0079] The equidistant support structure includes a lifting rod 8 parallel to the horizontal rod 4. A sliding connection portion 801 is formed at the end of the lifting rod 8, and the sliding connection portion 801 is slidably arranged in a chute 2 formed on the support plate;

[0080] The equidistant support structure further includes a sliding sleeve 9 slidably installed on the lifting rod 8. Two connecting rods 10 are symmetrically and rotatably installed on the sliding sleeve 9, and the connecting rods 10 connect adjacent two pressure filtration frame plates 6 or the pressure filtration frame plate 6 and the filter plate 7.

[0081] During use, the hydraulic cylinder 3 operates to push the filter press frame plate 6 away from the filter plate 7 towards the filter plate 7. Since two adjacent filter press frame plates 6 are connected by a connecting rod 10 and a sliding sleeve 9, when the filter press frame plate 6 moves, the connecting rod 10 can act on the sliding sleeve 9 to make the lifting rod 8 move downward along the length direction of the chute 2. And because the filter plate 7 is in a fixed state, the filter press frame plates 6 can move closer to each other at the same speed, that is, the gaps between two adjacent filter press frame plates 6 and between the filter press frame plate 6 and the filter plate 7 can remain the same as the filter press frame plate 6 moves. Thus, when the filter press frame plate 6 moves, the filter bags placed between the filter press frame plates 6 and between the filter press frame plate 6 and the filter plate 7 can be squeezed with the same extrusion force. And when the filter press member 11 operates, the filter press frame plates 6 are mechanically locked, so that when the filter press member 11 operates, the filter bags can be squeezed again by the same extruder, thereby improving the consistency of the filter press effect and preventing a certain filter bag from not being fully filtered due to the change of the gap between the filter press frame plates 6 and between the filter press frame plate 6 and the filter plate 7.

[0082] Through the above settings, during the filter press process, the gaps between the filter press frame plates 6 and between the filter press frame plate 6 and the filter plate 7 can be maintained the same, ensuring that the relative positions between the filter press frame plates 6 and between the filter press frame plate 6 and the filter plate 7 do not change during the filter press process, making the filter press effect more consistent and preventing a certain filter bag from not being fully filtered due to the change of the gap between the filter press frame plates 6 and between the filter press frame plate 6 and the filter plate 7.

[0083] A filter press method for the filter press includes the following steps:

[0084] Step 1: Place the filter bag filled with sludge between two adjacent filter press frame plates 6 and between the filter press frame plate 6 and the filter plate 7, and align the bag mouth of the filter bag with the screw propeller 13.

[0085] Step 2: Control the hydraulic cylinder 3 to operate. The hydraulic cylinder 3 will drive the filter press frame plate 6 away from the filter plate 7 towards the filter plate 7, and under the drive of the equidistant support structure, make the filter plate 7 and the filter press frame plate 6, and the filter press frame plates 6 move closer to each other equidistantly until the filter bag is squeezed, so that the sludge can be evenly distributed in the filter bag.

[0086] Step 3: Control the filter press member 11 to move, so that the filter press member 11 moves further towards the filter bag.

[0087] Step 4: When the filter pressing member 11 moves, the rotating assembly can drive the screw propelling member 13 to rotate, so that the opening of the filter pressing bag rotates, tightening the filter pressing bag, reducing the spreading area of the filter pressing bag, and then the filter pressing member 11 further moves to squeeze the filter pressing bag;

[0088] Step 5: After the filter pressing member 11 moves to a predetermined position, the bidirectional guiding assembly can drive the scraper 18 to move from top to bottom to scrape off the water droplets adhering to the inner side of the filter pressing surface 601;

[0089] Step 6: Reverse-control the hydraulic cylinder 3 and the filter pressing member 11 to act and remove the filter pressing bag that has completed the filtering.

[0090] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0091] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Bidirectional extrusion filtration device, characterized in that: include: At least two groups of filter press frame plates (6), wherein the interior of the filter press frame plates (6) is a hollow structure with an opening provided on one side and a filter press surface (601) provided on the other side; A filter press element (11) is slidably disposed on the filter press frame plate (6), and when the filter press element (11) moves toward the outside of the filter press frame plate (6), it can cooperate with the filter press surface (601) on the adjacent filter press frame plate (6) to perform filter pressing; A spiral propulsion member (13) is arranged in the middle of the filter press (11), and a convex point is formed on one side of the spiral propulsion member (13); a rotating assembly, connecting the spiral propulsion member (13) and the filter press frame plate (6), wherein the rotating assembly can drive the spiral propulsion member (13) to rotate when the filter press member (11) cooperates with the filter press surface (601); A scraper (18) is arranged inside the filter press frame plate (6) and is in contact with the inner side of the filter press surface (601); a bidirectional guiding assembly, connecting the scraper (18) and the filter press (11), the bidirectional guiding assembly being capable of causing the scraper (18) to move along the length direction of the filter press surface (601) when the filter press (11) moves to a predetermined position; The rotating assembly comprises a transverse shaft (15) installed in the filter press frame plate (6) and a sleeve shaft (14) coaxially connected to the spiral propulsion member (13), wherein the sleeve shaft (14) is slidably fitted with the transverse shaft (15); A guide groove is formed on the side wall of the sleeve shaft (14), and a convex shaft (1501) mounted on the side of the transverse shaft (15) is able to slide in the guide groove.

2. The bidirectional extrusion filtration device according to claim 1, characterized in that: A circular through hole is formed in the middle of the filter press (11), an annular groove (1101) is provided on the inner wall of the circular through hole, and an annular protrusion (1301) provided on the spiral propulsion member (13) is rotatably fitted into the annular groove (1101).

3. The bidirectional extrusion filtration device according to claim 1, characterized in that: The guide groove comprises a first straight groove (1401) and a second straight groove (1403) arranged along the axial direction of the sleeve shaft (14); the first straight groove (1401) and the second straight groove (1403) are arranged in an offset manner and are connected via the spiral groove (1402).

4. The bidirectional extrusion filtration device according to claim 1, characterized in that: The bidirectional guide assembly comprises a vertical rod (16) installed in the filter press frame plate (6), a counterweight block (17) is slidably mounted on the vertical rod (16), the counterweight block (17) is connected to the scraper (18), and a connecting rod (19) is arranged on the counterweight block (17); The bidirectional guide assembly further comprises a follower plate (21) connected to the filter press (11), wherein a driving groove surface is formed on the follower plate (21), and a pulley (20) rotatably mounted on an end of the connecting rod (19) away from the counterweight (17) is capable of rolling in the driving groove surface.

5. The bidirectional extrusion filtration device according to claim 4, characterized in that: The driving groove surface comprises a triangular recessed area provided on the follower plate (21), and an inclined surface (2103) is provided on one side of the triangular recessed area; The driving groove surface further comprises an extension groove (2101) and a horizontal groove (2102) arranged on the follower plate (21), the extension groove (2101) and the horizontal groove (2102) being coaxial, and the inclined surface (2103) extending to the connection between the extension groove (2101) and the horizontal groove (2102); One end of the horizontal groove (2102) is connected to the triangular recessed area, and the other end is rotatably mounted with a support member (22), and one end of the support member (22) away from the horizontal groove (2102) is in contact with the inclined surface (2103).

6. A filter press, characterized in that: The bidirectional extrusion filter device according to claim 1 further comprises: A base (1), wherein two groups of support plates are symmetrically arranged on the base (1), a transverse rod (4) is installed between the two groups of support plates, and the filter press frame plate (6) is connected to the transverse rod (4) via a connecting piece (5); A hydraulic cylinder (3) connected to one of the support plates and the filter press frame plate (6); A filter press plate (7) connected to the transverse rod (4); An equidistant support structure connects the filter press plate (7) and the filter press frame plate (6), and the equidistant support structure can make the distance change between two adjacent filter press frame plates (6) the same when the filter press frame plates (6) move toward each other.

7. The filter press according to claim 6, characterized in that The equidistant support structure comprises a lifting rod (8) parallel to the transverse rod (4), the end of the lifting rod (8) being formed with a sliding connection portion (801), and the sliding connection portion (801) being slidably arranged in a sliding groove (2) formed on the support plate; The equidistant support structure further comprises a sliding sleeve (9) slidably mounted on the lifting rod (8), and two connecting rods (10) are symmetrically mounted on the sliding sleeve (9) for rotation, wherein the connecting rods (10) connect two adjacent filter press frame plates (6) or the filter press frame plate (6) and the filter press plate (7).

8. A filtration method using a filter press as claimed in claim 6, characterized in that: The following steps are involved: Step 1: placing a filter press bag filled with sludge between two adjacent filter press frame plates (6) and between the filter press frame plate (6) and the filter press plate (7), and aligning the bag opening of the filter press bag with the spiral propulsion member (13); Step 2: Controlling the hydraulic cylinder (3) to move, the hydraulic cylinder (3) will drive the filter press frame plate (6) away from the filter press plate (7) to move toward the filter press plate (7), and under the drive of the equidistant support structure, the filter press plate (7) and the filter press frame plate (6), and the filter press frame plates (6) and the filter press frame plates (6) move towards each other at an equidistant distance, until the filter press bag is squeezed, so that the sludge can be evenly distributed in the filter press bag; Step 3: Controlling the movement of the filter press element (11) so that the filter press element (11) moves further toward the filter press bag; Step 4: When the filter press element (11) moves, the rotating assembly can drive the spiral propulsion element (13) to rotate, thereby rotating the bag opening of the filter press bag, tightening the filter press bag, reducing the spreading area of ​​the filter press bag, and then the filter press element (11) moves further to squeeze the filter press bag; Step 5: After the filter press element (11) moves to a predetermined position, the bidirectional guide assembly can drive the scraper (18) to move from top to bottom to scrape away water droplets adhering to the inner side of the filter press surface (601); Step 6: Reversely control the hydraulic cylinder (3) and the filter press element (11) to move, and remove the filter bag that has completed the filtration.

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