A filter plate for dehydration by changing volume

Abstract

The utility model belongs to the technical field of vertical filter presses, and specifically discloses a filter plate that utilizes volume change for dehydration, and the filter plate mainly includes a filtrate guide plate, a filter plate support plate, a movable filter frame, and a fixed filter frame. A plurality of guide grooves are provided on the filtrate guide plate, and the guide grooves are mutually conductive; a feed inlet is provided on one side of the filter plate support plate, a fixed filter frame is provided on the outside of the movable filter frame, and a gap is left between the movable filter frame and the fixed filter frame, and spring holes are provided at the relative positions of the movable filter frame and the fixed filter frame, and a compression spring arranged in a vertical direction is provided in the spring hole. The filter plate of the utility model optimizes and improves the internal structure of the filter plate, that is, by arranging the fixed filter frame on the outside of the movable filter frame, and arranging compression springs in the movable filter frame and the fixed filter frame, and utilizing the extrusion force provided by the hydraulic oil cylinder to compress the volume of the filter cake in the feed cavity to reduce the liquid content in the filter cake, so as to meet the requirements of the production process.

Description

Technical Field

[0001] The utility model relates to the technical field of vertical filter presses, in particular to a filter plate which utilizes volume change to carry out dehydration. Background Art

[0002] The filter plate is a key component of the vertical filter press for reducing the liquid content in the filter cake. Currently, there are two main measures to reduce the liquid content in the filter cake: one is to deliver high-pressure water or compressed air to the filter plate extrusion cavity, and squeeze the filter cake by squeezing the rubber diaphragm to achieve the purpose of squeezing out the liquid in the filter cake; the other is to use compressed gas for air drying, and input the compressed gas into the feed cavity through a pipeline, so that the compressed gas blows out the liquid in the filter cake, thereby achieving the purpose of reducing the liquid content in the filter cake.

[0003] However, in current production practice, the dehydration effect of the filter cake is often proportional to the extrusion force and the air drying pressure. Therefore, when dealing with slurry that is difficult to dehydrate, the equipment needs to provide a larger extrusion force and air drying pressure to effectively compress the volume of the filter cake and allow the liquid in the filter cake to escape. In order to achieve a larger extrusion force, the requirements for the equipment will become more stringent, the cost will continue to increase, the economic efficiency will continue to decline, and the mechanical properties of the rubber diaphragm cannot meet the use conditions of a larger "extrusion force".

[0004] Therefore, the utility model proposes a filter plate which utilizes volume change to perform dehydration. Utility Model Content

[0005] The utility model aims to provide a filter plate which utilizes volume change to carry out dehydration, the filter plate can effectively reduce the liquid content in the filter cake and can meet the use condition of a larger extrusion force.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A filter plate for dehydration by changing volume, comprising a filter plate;

[0008] A filtrate guide plate is arranged on the top of the filter plate, a plurality of guide grooves are opened on the filtrate guide plate, a filtrate nozzle is arranged on one side of the filtrate guide plate, and the filtrate nozzle is connected with the guide groove;

[0009] A filter plate support plate is arranged below the filtrate guide plate, a feed inlet is arranged on one side of the filter plate support plate, and a feed nozzle is arranged on the feed inlet;

[0010] A movable filter frame is arranged below the filter plate support plate, a fixed filter frame is arranged outside the movable filter frame, and a gap is left between the movable filter frame and the fixed filter frame;

[0011] Spring holes are provided at relative positions of the movable filter frame and the fixed filter frame, and compression springs arranged in a vertical direction are provided in the spring holes;

[0012] A material feeding cavity is formed inside the movable filter frame, and a first filter cloth is arranged below the material feeding cavity.

[0013] Preferably, a groove is provided on the outer side wall of the dynamic filter frame, and a dynamic sealing ring is arranged in the groove.

[0014] Preferably, the filter plate is further provided with a second filter cloth;

[0015] The fixed filter frame is connected to one end of the second filter cloth through a filter cloth pressing plate, and the movable filter frame is connected to the other end of the second filter cloth through a filter cloth pressing strip;

[0016] The back side of the second filter cloth and the area enclosed by the moving filter frame and the fixed filter frame form a clear liquid cavity.

[0017] Preferably, the outer side wall of the movable filter frame is provided with a boss, the inner side wall of the fixed filter frame is provided with a recess matched with the boss, and the boss is assembled and connected with the recess.

[0018] Preferably, an upper sealing ring is provided between the filter plate support plate and the movable filter frame.

[0019] Preferably, a lower sealing ring is provided at the bottom of the fixed filter frame.

[0020] Preferably, the horizontal length of the first filter cloth is greater than the horizontal length of the feeding cavity.

[0021] Preferably, the gap between the movable filter frame and the fixed filter frame is 2 mm.

[0022] Preferably, the filtrate guide plate and the filter plate support plate are connected by bolts, and the filter plate support plate and the movable filter frame are connected by bolts.

[0023] Preferably, the plurality of guide grooves are interconnected.

[0024] The beneficial effects of the utility model are as follows:

[0025] The utility model proposes a filter plate which utilizes volume change for dehydration, and optimizes and improves the internal structure of the filter plate, that is, by arranging a fixed filter frame on the outside of a movable filter frame, and arranging compression springs in the movable filter frame and the fixed filter frame, and utilizing the extrusion force provided by an external hydraulic oil cylinder, a relative displacement is generated between the movable filter frame and the fixed filter frame to compress the volume of a feed cavity, thereby further compressing the volume of the filter cake in the feed cavity to dehydrate it, so as to reduce the liquid content in the filter cake, thereby meeting the requirements of the production process; an upper sealing ring, a lower sealing ring and a dynamic sealing ring are arranged to ensure that the filtrate and the slurry will not overflow from the gap, provide good sealing performance, and ensure the smooth progress of the dehydration process; at the same time, a second filter cloth is added to isolate solid debris outside the clear liquid cavity, so as to ensure that the dynamic sealing ring is not damaged, and ensure a good sealing effect.

[0026] Compared with the solution of using rubber diaphragm extrusion, the extrusion force required to compress the volume of the filter cake in the utility model is directly generated by the hydraulic cylinder. The hydraulic cylinder can usually generate a large extrusion force, which will cause the filter cake to be compressed to a greater extent, and has a better dehydration effect on the treatment of "difficult-to-dehydrate materials"; in addition, the dehydration effect is more obvious when treating "high-temperature difficult-to-dehydrate materials". The utility model does not use a rubber diaphragm for extruding the filter cake, which completely avoids the disadvantage of the rubber diaphragm that it is not resistant to high temperatures. The filter plate of the utility model can effectively compress the filter cake even under high-temperature working conditions, thereby achieving an ideal dehydration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the front view of the utility model;

[0028] Figure 2 for Figure 1 A magnified image of point A;

[0029] Figure 3 It is a side view of the utility model;

[0030] Figure 4 It is a schematic diagram of the assembly of the utility model;

[0031] Figure 5 for Figure 4 The enlarged view of point B;

[0032] Among them, 1-filtrate guide plate, 11-guide groove, 12-filtrate nozzle;

[0033] 2-filter plate support plate, 21-feeding port, 22-feeding nozzle;

[0034] 3-moving filter frame, 31-upper sealing ring, 32-filter cloth pressure strip, 33-moving sealing ring;

[0035] 4-fixed filter frame, 41-lower sealing ring, 42-filter cloth pressing plate;

[0036] 5-feeding cavity;

[0037] 61-first filter cloth, 62-second filter cloth;

[0038] 7-clear liquid chamber; 8-compression spring. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Combination Figures 1 to 5 As shown, the utility model proposes a filter plate for dehydration by changing the volume, and the filter plate mainly comprises structural components such as a filtrate guide plate 1, a filter plate support plate 2, a moving filter frame 3 and a fixed filter frame 4, which are arranged in sequence from top to bottom. The filter plate can achieve the purpose of reducing the liquid content in the filter cake by changing the volume of the feed cavity.

[0042] like Figure 1 As shown, a filtrate guide plate 1 is arranged on the top of the filter plate, and a plurality of guide grooves 11 are opened on the filtrate guide plate 1, wherein the plurality of guide grooves 11 are interconnected, which can effectively improve the discharge speed of the filtrate. If a certain guide groove 11 is blocked, the other guide grooves 11 are still connected, which will not affect the filtrate discharge effect, thereby ensuring the smooth progress of the dehydration process.

[0043] Combination Figure 3 and Figure 4 As shown, a filtrate nozzle 12 is provided on one side of the filtrate guide plate 1 , and the filtrate nozzle 12 is connected to the guide groove 11 , and the filtrate separated from the slurry can be discharged from the filter plate through the filtrate nozzle 12 .

[0044] Combination Figure 1As shown, a filter plate support plate 2 is arranged below the filtrate guide plate 1, and the filter plate support plate 2 can enhance the rigidity of the filter plate. A feed inlet 21 is provided on one side of the filter plate support plate 2, and a feed nozzle 22 is arranged on the feed inlet 21. External slurry is input into the filter plate through the feed nozzle 22 and the feed inlet 21 for dehydration and filtration.

[0045] Combination Figure 1 and Figure 3 As shown, a movable filter frame 3 is arranged below the filter plate support plate 2, and the movable filter frame 3 is fixedly connected to the filter plate support plate 2 by bolts. The movable filter frame 3 is annular in structure as a whole, and the middle opening area forms a feed cavity 5, and the external slurry enters the feed cavity 5 through the feed port 21. A first filter cloth 61 is arranged below the feed cavity 5, and the horizontal length of the first filter cloth 61 is greater than the horizontal length of the feed cavity 5, which can prevent the slurry and filtrate from overflowing, and ensure the smooth progress of the slurry dehydration process.

[0046] Combination Figure 2 As shown, an upper sealing ring 31 is provided between the filter plate support plate 2 and the moving filter frame 3. The upper sealing ring 31 can prevent the slurry from overflowing from the gap between the filter plate support plate 2 and the moving filter frame 3, thereby ensuring a good sealing effect.

[0047] Combination Figure 1 and Figure 3 As shown, a fixed filter frame 4 is arranged outside the moving filter frame 3, and a gap of 2 mm is left between the moving filter frame 3 and the fixed filter frame 4, which can ensure flexible reciprocating movement between the moving filter frame 3 and the fixed filter frame 4, and can avoid the increase of friction between the moving filter frame 3 and the fixed filter frame 4 due to close fit, thereby causing damage to the moving filter frame 3 and the fixed filter frame 4. A groove is provided on the outer wall of the moving filter frame 3, and a dynamic sealing ring 33 is provided in the groove, and the dynamic sealing ring 33 is arranged between the moving filter frame 3 and the fixed filter frame 4. The dynamic sealing ring 33 can effectively prevent the slurry from overflowing from the 2 mm gap between the moving filter frame 3 and the fixed filter frame 4, and ensure a good sealing effect.

[0048] Combination Figure 2 As shown, a second filter cloth 62 is also provided in the filter plate. The fixed filter frame 4 is connected to one end of the second filter cloth 62 through the filter cloth pressing plate 42, and the movable filter frame 3 is connected to the other end of the second filter cloth 62 through the filter cloth pressure strip 32. The back side of the second filter cloth 62 and the area surrounded by the movable filter frame 3 and the fixed filter frame 4 form a clear liquid cavity 7.

[0049] During the feeding process, a small amount of liquid will pass through the second filter cloth 62 and enter the clear liquid chamber 7. Since the second filter cloth 62 has a high filtering accuracy, under normal circumstances, only liquid enters the clear liquid chamber 7, and there is only a very small amount of solid matter in it. The main purpose of setting the second filter cloth 62 is to prevent solid foreign matter from adhering to the inner surface of the fixed filter frame 4, so that when the moving filter frame 3 and the fixed filter frame 4 move relative to each other, the dynamic seal ring 33 will not be worn, and the dynamic seal ring 33 will not be damaged, so as to ensure that the slurry will not overflow from the gap between the moving filter frame 3 and the fixed filter frame 4.

[0050] Combination Figure 1 and Figure 2 As shown, spring holes are provided at relative positions of the movable filter frame 3 and the fixed filter frame 4, and compression springs 8 arranged in a vertical direction are provided in the spring holes. Since the compression springs 8 are in a compressed state when the filter plate is assembled, in order to ensure that the movable filter frame 3 and the fixed filter frame 4 can still be reliably assembled together under the elastic force of the compression springs 8, the outer side wall of the movable filter frame 3 is provided with a boss, and the inner side wall of the fixed filter frame 4 is provided with a concave platform adapted to the boss, and the movable filter frame 3 and the fixed filter frame 4 can be assembled through the embedded connection of the boss and the concave platform.

[0051] Combination Figure 2 As shown, a lower sealing ring 41 is provided at the bottom of the fixed filter frame 4, and the lower sealing ring 41 is installed in the groove of the fixed filter frame 4 to prevent slurry, filtrate, etc. from overflowing from the joint surface between the fixed filter frame 4 and the filtrate guide plate 1 when feeding.

[0052] Combination Figures 1 to 5 As shown, the filtrate guide plate 1 and the filter plate support plate 2 are connected by bolts, and the filter plate support plate 2 and the movable filter frame 3 are connected by bolts, and the three form a rigid overall structure, which can improve the stability during the dehydration process.

[0053] The working principle and dehydration process of the filter plate of the utility model are as follows:

[0054] First of all, it should be explained that the filter plate claimed in the embodiment of the utility model mainly includes Figures 1 to 5 The various components shown in the figure are not limited to the aforementioned components in order to achieve better performance of the filter plate. In this embodiment, two filter plates (upper filter plate, lower filter plate) and the first filter cloth 61 are used for explanation. Figure 4 , Figure 5As shown, the upper filter plate and the lower filter plate are placed in parallel, and the first filter cloth 61 is placed between the upper filter plate and the lower filter plate. The upper and lower filter plates are compressed by a tightening device, so that the lower sealing ring 41 reaches a suitable compression amount, which can prevent the slurry and filtrate from overflowing. Among them, the tightening device includes but is not limited to a hydraulic cylinder. The compression spring 8 is in a pre-compression state. At this time, the pre-compression force of the compression spring 8 can ensure that the lower sealing ring 41 reaches a suitable sealing force to prevent the slurry and filtrate from overflowing.

[0055] The slurry delivered by the external feed pump is input into the feed chamber 5 through the feed nozzle 22 via the feed port 21. The solid matter in the slurry is retained by the first filter cloth 61 on its upper surface. At the same time, the liquid in the slurry passes through the first filter cloth 61 into the guide groove 11, and finally flows into the filtrate nozzle 12 and is discharged into the external container.

[0056] During the feeding process, a small amount of liquid will pass through the second filter cloth 62 and enter the clear liquid chamber 7. The second filter cloth 62 has a very high filtering accuracy. Under normal circumstances, only liquid enters the clear liquid chamber 7, and there is only a very small amount of solid matter in it. As the aforementioned feeding time continues, a filter cake is gradually formed on the upper surface of the first filter cloth 61. When the thickness or weight of the filter cake reaches the requirement, the feeding process is stopped; at this time, the liquid content in the filter cake is relatively high and does not meet the process requirements.

[0057] In order to make the liquid content in the filter cake meet the production process requirements, the external hydraulic cylinder needs to increase the output force. The cylinder thrust finally acts on the filter plate, and the filtrate guide plate 1, the filter plate support plate 2, and the movable filter frame 3 will move downward at the same time. A relative displacement will occur between the movable filter frame 3 and the fixed filter frame 4. During the downward movement, the volume of the filter cake in the feed cavity 5 will be continuously compressed, and the liquid in the filter cake will be squeezed out.

[0058] While squeezing the filter cake, the compression spring 8 will also be continuously compressed, and the elastic force of the compression spring 8 will be transmitted to the fixed filter frame 4, thereby increasing the sealing force of the lower sealing ring 41, and preventing the slurry and filtrate from overflowing from the joint surface of the fixed filter frame 4 and the filtrate guide plate 1 due to insufficient sealing force of the lower sealing ring 10 when the volume of the filter cake is compressed.

[0059] When the liquid content in the filter cake meets the process requirements, the thrust of the hydraulic cylinder is released, the upper filter plate is separated from the lower filter plate, and a suitable gap is left between the two to unload the filter cake. When the thrust of the hydraulic cylinder is released, the relative position between the fixed filter frame 4 and the movable filter frame 5 will return to the initial state under the thrust of the compression spring 8.

[0060] In the embodiment of the utility model, during the above-mentioned compression of the filter cake, the filter cake will be compressed too densely and stick to the inner wall of the feed chamber 5. Usually, the filter cake cannot fall freely from the feed chamber 5 of the upper filter plate. In order to make the filter cake fall smoothly, a certain amount of compressed air pulse airflow needs to be sent from the feed nozzle 22 to blow the filter cake out of the feed chamber 5. The filter cake discharged from the feed chamber 5 will fall on the first filter cloth 61, and the filter cake will be transported to the silo through the filter cloth transmission device (not shown in the utility model).

[0061] Combination Figures 1 to 5 As shown, the utility model proposes a filter plate that uses volume change for dehydration. The filter plate is improved by optimizing its internal structure, that is, by setting the fixed filter frame 4 outside the moving filter frame 3, and setting a compression spring 8 in the moving filter frame 3 and the fixed filter frame 4, and using the extrusion force provided by the external hydraulic cylinder, a relative displacement is generated between the moving filter frame 3 and the fixed filter frame 4 to compress the volume of the feed chamber 5, thereby further compressing the volume of the filter cake in the feed chamber 5 to dehydrate it, so as to reduce the liquid content in the filter cake, thereby meeting the requirements of the production process. By setting the upper sealing ring 31, the lower sealing ring 41 and the dynamic sealing ring 33, it is ensured that the filtrate and the slurry will not overflow from the gap, providing good sealing performance, and ensuring the smooth progress of the dehydration process. At the same time, by adding a second filter cloth 62, the solid debris is isolated outside the clear liquid chamber 7 to ensure that the dynamic sealing ring 33 is not damaged, thereby ensuring a good sealing effect.

[0062] At the same time, compared with the solution of using rubber diaphragm extrusion, the extrusion force required to compress the volume of the filter cake in the utility model is directly generated by the hydraulic cylinder. The hydraulic cylinder can usually generate a large extrusion force, which will cause the filter cake to be compressed to a greater extent, and has a better dehydration effect on the treatment of "difficult-to-dehydrate materials"; in addition, the dehydration effect is more obvious when treating "high-temperature difficult-to-dehydrate materials". The utility model does not use a rubber diaphragm for extruding the filter cake, which completely avoids the disadvantage of the rubber diaphragm not being resistant to high temperatures. The filter plate of the utility model can effectively compress the filter cake even under high-temperature working conditions, and can achieve an ideal dehydration effect.

[0063] Of course, the above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model and should be protected by the utility model.

Claims

1. A filter plate for dehydration by changing volume, characterized in that: Including filter plate; A filtrate guide plate is arranged on the top of the filter plate, a plurality of guide grooves are opened on the filtrate guide plate, a filtrate nozzle is arranged on one side of the filtrate guide plate, and the filtrate nozzle is connected with the guide groove; A filter plate support plate is arranged below the filtrate guide plate, a feed inlet is arranged on one side of the filter plate support plate, and a feed nozzle is arranged on the feed inlet; A movable filter frame is arranged below the filter plate support plate, a fixed filter frame is arranged outside the movable filter frame, and a gap is left between the movable filter frame and the fixed filter frame; Spring holes are provided at relative positions of the movable filter frame and the fixed filter frame, and compression springs arranged in a vertical direction are provided in the spring holes; A material feeding cavity is formed inside the movable filter frame, and a first filter cloth is arranged below the material feeding cavity.

2. A filter plate for dehydration by changing volume according to claim 1, characterized in that: A groove is provided on the outer side wall of the dynamic filter frame, and a dynamic sealing ring is arranged in the groove.

3. A filter plate for dehydration by changing volume according to claim 2, characterized in that: The filter plate is also provided with a second filter cloth; The fixed filter frame is connected to one end of the second filter cloth through a filter cloth pressing plate, and the movable filter frame is connected to the other end of the second filter cloth through a filter cloth pressing strip; The back side of the second filter cloth and the area enclosed by the moving filter frame and the fixed filter frame form a clear liquid cavity.

4. A filter plate for dehydration by changing volume according to claim 1, characterized in that: The outer side wall of the movable filter frame is provided with a boss, and the inner side wall of the fixed filter frame is provided with a recess matched with the boss, and the boss is assembled and connected with the recess.

5. The filter plate for dehydration by changing volume according to claim 1, characterized in that: An upper sealing ring is arranged between the filter plate supporting plate and the moving filter frame.

6. The filter plate for dehydration by changing volume according to claim 1, characterized in that: A lower sealing ring is arranged at the bottom of the fixed filter frame.

7. The filter plate for dehydration by changing volume according to claim 1, characterized in that: The horizontal length of the first filter cloth is greater than the horizontal length of the feeding cavity.

8. The filter plate for dehydration by changing volume according to claim 1, characterized in that: The gap between the moving filter frame and the fixed filter frame is 2 mm.

9. The filter plate for dehydration by changing volume according to claim 1, characterized in that: The filtrate guide plate and the filter plate support plate are connected by bolts, and the filter plate support plate and the moving filter frame are connected by bolts.

10. The filter plate for dehydration by changing volume according to claim 1, characterized in that: The plurality of guide grooves are interconnected.

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