Full-automatic filter press with drum discharging

Abstract

A new type of filter press with filter plate rotating around a square drum for discharge and uninterrupted continuous operation. A driving drum 301 drives two conveying chains 302 to rotate; each of the latter comprises rigid large links 302A and small links 302B; each large link is used for mounting a lower filter cloth 319, and the small link is used for adapting to the "chamfer" of the drum. Each lower filter cloth is clamped by a plurality of bolts 320, two lower filter cloth pressing plates 321 and two lower filter cloth frames 323, and is connected to the large link through a pin shaft 322. When the filter cake is rotated to below the center line of the drum with the square drum, the filter cake only needs to use gravity to overcome the adhesion with the lower filter cloth to easily fall off. With the action of the auxiliary discharge scraper mechanism, the probability of complete and clean filter cake falling off can basically reach 100%. Individual filter cakes that do not fall off will not fall into and / or be stuck between the sealing surfaces of the filter plates due to not being relatively displaced with the filter cloth, will not affect the sealing of the filter chamber in the next working cycle, and will not cause the "running pulp" of the feed or stop.

Description

Technical Field

[0001] This invention relates to a fully automatic filter press that utilizes roller discharge. Background Technology

[0002] Traditional filter presses typically have filter plates that are vertically suspended, while the pressing cylinders are arranged in two ways: one is horizontal to "tighten" the filter plates, and the other is vertical to "grip" the filter plates.

[0003] The first method, which uses a hydraulic cylinder to "tighten" the filter plate, is shown in the attached image. Figure 1 As shown, the main hydraulic cylinder 101 is horizontally mounted on the frame 102, and the movable pressure plate 103 and filter plate 104 are suspended on the frame by their own rollers. When the filter plate 104 needs to be pressed, the piston rod of the hydraulic cylinder extends and "presses" against the center of the movable pressure plate 103 to press the filter plate 104 tightly, forming a sealed filter chamber; the second method of using a hydraulic cylinder to "grip" the filter plate is shown in the attached figure. Figure 2 As shown, the main oil cylinder 201 is vertically mounted, and the movable plate 206 and filter plate 205 are suspended on the frame 203 by their own rollers. When the piston rod of the main oil cylinder extends, the triangular plate 202 rotates around its fixed axis, driving the connecting rod 204 to pull the movable plate 206 to move horizontally. The movable plate 206 "hugs" the filter plate 205 to form a sealed filter chamber.

[0004] In the traditional arrangement of vertically suspended filter plates, the filter cake automatically falls off during unloading by gravity, overcoming the adhesive shear force between the filter cake and the filter cloth that is suspended longitudinally. However, when processing highly viscous materials, the weight of the filter cake is insufficient to overcome the adhesive shear force, resulting in incomplete filter cake detachment to varying degrees. This often requires machine shutdown and manual cleaning of the filter cake, affecting the continuity of work and production efficiency.

[0005] Furthermore, since the filter cake falls from the filter cloth, which is suspended longitudinally, under gravity, and the opening interval of the filter plates is limited by the longitudinal dimensions of the filter press when the filter chamber opens to discharge material, the filter cake can easily fall and / or get stuck between the sealing surfaces of the filter plates. If this happens and is not detected and removed in time, it will lead to incomplete sealing of the filter chamber in the next working cycle, causing "slurry leakage" during feeding. This not only pollutes the working environment but also quickly punctures the filter cloth, seriously affecting production. Therefore, to avoid this failure, it is necessary to manually check whether the filter cake is stuck between the filter plates and clean it. Summary of the Invention

[0006] According to one aspect of the present invention, a fully automatic filter press utilizing drum discharge is provided, characterized by comprising:

[0007] frame,

[0008] Mounted on the rack:

[0009] Vertical hydraulic cylinder

[0010] Regular polygonal drive roller,

[0011] A driven roller with a regular polygonal shape.

[0012] Two conveyor chains are wound around the driving and driven rollers.

[0013] The chain drive mechanism is used to drive the drive roller to rotate.

[0014] Lower filter plate body,

[0015] The upper filter plate is fixed to the piston rod of the vertical hydraulic cylinder.

[0016] Each of the two conveyor chains includes multiple rigid large links and multiple small links. Each large link is used to install the lower filter cloth, and the small links are used to accommodate the corresponding chamfers of the regular polygonal drive roller and driven roller.

[0017] Each piece of filter cloth is clamped by multiple sets of bolts, two filter cloth pressure plates, and two filter cloth frames, and is connected to the corresponding large links of two conveyor chains via conveyor chain pins.

[0018] The filtrate discharge pipe and feed pipe are welded to the upper filter plate body.

[0019] The filter plate diaphragm has densely packed protrusions. The gaps between these protrusions form the filtrate flow channel of the upper filter plate. The filtrate flow channel collects the filtrate into the filtrate discharge pipe for discharge outside the machine.

[0020] The filter plate diaphragm is fixed to the upper filter plate body by a diaphragm fixing plate.

[0021] A diaphragm plate is fixed to the upper filter plate body through a filter plate diaphragm, and has multiple through holes for discharging filtrate into the upper discharge pipe.

[0022] The filter cloth is fixed to the diaphragm fixing plate.

[0023] The lower filter plate liner is fixed to the lower filter plate body. The surface of the lower filter plate liner is covered with lower filter cloth support bosses and filtrate discharge grooves, and has multiple filtrate water drainage holes.

[0024] The lower filter plate has a long drainage groove to collect the filtrate flowing out of the drainage holes in the lower filter plate liner.

[0025] The filtrate discharge pipe is welded below the drain hole of the lower filter plate and is used to discharge the filtrate outside the filter press. Attached image description:

[0026] Figure 1 This is a structural diagram of a traditional filter press where the filter plates are "tightened" by a hydraulic cylinder.

[0027] Figure 2 This is a structural diagram of a traditional filter press where the filter plates are "gripped" by hydraulic cylinders.

[0028] Figure 3A This is a front view of a fully automatic filter press with drum discharge according to an embodiment of the present invention, in the closed state of the filter chamber;

[0029] Figure 3B yes Figure 3A Left view of an embodiment;

[0030] Figure 3C This is a front view of a fully automatic filter press utilizing drum discharge in the unloading state, according to an embodiment of the present invention;

[0031] Figure 3D yes Figure 3A The first enlarged view shows the detailed structure of the filter chamber of the filter press;

[0032] Figure 3E yes Figure 3A The second enlarged view shows the detailed structure of the connection between the filter cloth and the conveyor chain at the bottom of the filter press;

[0033] Figure 3F yes Figure 3A The third enlarged view shows the detailed structure of the lower filter plate of the filter press;

[0034] Figure 3G yes Figure 3B The enlarged view shows the detailed structure of the filter plate diaphragm and the upper drain pipe;

[0035] Figure 3H This is a cross-sectional view of the lower filter plate liner according to an embodiment of the present invention;

[0036] Figure 3I This is a partially enlarged cross-sectional view of the lower filter plate liner according to an embodiment of the present invention, showing the detailed structure of the filter cloth support boss, drainage groove, and drainage hole;

[0037] Figure 3J These are front and top views of a lower filter plate body according to an embodiment of the present invention;

[0038] Figure 3K This is a partial enlarged view of the front and top views of the lower filter plate body according to an embodiment of the present invention, showing the detailed structure of the long drainage groove and drainage holes on the lower filter plate body. Detailed Implementation

[0039] In response to the shortcomings of the traditional filter press, the inventors have proposed a novel filter press solution that allows the filter plates to rotate around a square drum for unloading and can operate continuously without interruption.

[0040] A filter press according to an embodiment of the present invention, such as Figures 3A-3K As shown, 301 is the drive roller, which drives the two conveyor chains 302 to rotate. Each of the two conveyor chains 302 includes a rigid large link 302A and a small link 302B. Each rigid large link 302A is used to install the lower filter cloth 319, and the small link 302B is used to accommodate the four "bevels" of the square roller.

[0041] like Figure 3B and 3E As shown, each lower filter cloth 319 is clamped by multiple sets of bolts 320, two lower filter cloth pressure plates 321 and two lower filter cloth frames 323, and connected to the large chain link 302A of the two conveyor chains through the conveyor chain pin 322.

[0042] According to one embodiment, each lower filter cloth frame 323 includes multiple steel pipes 323A and a long strip steel plate 323B, with each steel pipe 323A welded to the long strip steel plate 323B at a certain distance.

[0043] The number of lower filter cloths 319 is the same as the number of large chain links 302A of the conveyor chain. In one embodiment, the calculation method is: number of lower filter cloths = number of filter plate groups + 8. Figure 3A In the embodiment shown, there are 2 sets of filter plates (one set of filter plates at the top and one set at the bottom are called a set of filter plates), and there are 10 pieces of filter cloth at the bottom. Figure 3A The filter press shown is an embodiment with two sets of filter plates and two sets of hydraulic cylinders (one set of hydraulic cylinders for each set of filter plates, and generally two cylinders per set). Embodiments with any number of filter plates and their associated hydraulic cylinders can also be used as needed.

[0044] The frame, designated 303, is used to mount the vertical hydraulic cylinder 304, the driving roller 301, the driven roller 308, the chain power mechanism 312, the auxiliary unloading scraper mechanism 332, and the lower filter plate body 307.

[0045] 311 is the filtrate water discharge pipe; 309 is the feed pipe, which is welded to the upper filter plate 310; the upper filter plate 310 is fixed to the piston rod 305 of the oil cylinder.

[0046] like Figure 3D As shown, reference numeral 313 is a filter plate diaphragm with densely packed frustoconical protrusions 325. The gaps between these frustoconical protrusions form flow channels for the filtrate water on the upper filter plate, which collects and discharges into the upper discharge pipe 311. The filter plate diaphragm 313 is fixed to the upper filter plate body 310 by a first countersunk screw 315A and a diaphragm fixing plate 314. Reference numeral 333 is the filter cake formed in the closed filter chamber.

[0047] like Figure 3GAs shown, 326 is a diaphragm plate with multiple through holes 324 for discharging filtrate water into the upper discharge pipe 311. It is fixed to the upper filter plate body 310 with a third countersunk screw 315C through the filter plate diaphragm 313.

[0048] like Figure 3D As shown, 316 is the upper filter cloth, which is fixed to the diaphragm fixing plate 314 with screw 317; 307 is the lower filter plate body, and 318 is the lower filter plate liner, which is fixed to the lower filter plate body 307 by the second countersunk screw 315B.

[0049] like Figure 3F As shown, the surface of the lower filter plate liner 318 is covered with elongated lower filter cloth support bosses 328 and filtrate water drainage grooves 329, and has multiple filtrate water drainage holes 330 along its width centerline; the lower filter plate body 307 has a long drainage groove 331 at its width centerline, which can collect the filtrate water flowing out from the drainage holes 330 of the lower filter plate liner 318 to the lower filter plate drainage hole 327. Reference numeral 306 is a filtrate water discharge pipe, welded below the lower filter plate drainage hole 327, which discharges the filtrate water to the outside of the filter press;

[0050] like Figure 3C As shown, reference numeral 333 indicates the filter cake during the unloading process. The working process of the filter press with a square unloading roller according to the present invention is as follows: Figure 3A With the piston rod 305 of the hydraulic cylinder extended, the upper filter plate is pressed against the lower filter cloth 319 and the lower filter plate liner 318 by the filter plate diaphragm 314 and the upper filter cloth 316, forming a closed filter chamber. Then, pressure filtration is performed, with the filtrate discharged through the upper filtrate discharge pipe 311 and the lower filtrate discharge pipe 306. The material after filtrate removal forms a filter cake 333 in the closed filter chamber. After pressure filtration is completed, as... Figure 3C As shown, the piston rod 305 of the hydraulic cylinder retracts, thereby opening the filter chamber. The chain power mechanism 312 starts, and the conveyor chain 302 carries the lower filter cloth 319 and the filter cake 333 along... Figure 3A The material is unloaded by rotating clockwise. (Note) Figure 3A and Figure 3C The driving roller 301 and the driven roller 308 are at different rotation angles. If the unloading (filter cake) is incomplete, the undischarged material will be scraped off by the auxiliary unloading scraper mechanism 332.

[0051] The distance traveled by the conveyor chain in each working cycle is matched with the number of filter plate groups, that is: chain travel distance = number of filter plate groups × (filter plate width + filter plate spacing). Figure 3B yes Figure 3A Left view, Figure 3A The width of the filter plates and the number of filter plate groups are displayed. Figure 3B The length of the filter plate and the number of cylinders in each group of cylinders are displayed.

[0052] Advantages and benefits of the present invention

[0053] As can be seen from the above description, the advantages and beneficial effects of the present invention include:

[0054] 1) When the filter cake rotates with the square drum to below the drum's center line, it easily detaches using only gravity to overcome the adhesive force with the lower filter cloth. This is completely different from the traditional filter press where the filter cake needs to overcome adhesive shear force to detach, as the filter plates are arranged vertically. Combined with the scraping action of the auxiliary discharge scraper mechanism, the probability of the filter cake detaching completely is practically 100%. Similarly, the probability of the filter cake sticking to the upper filter cloth is negligible. More specifically, the force perpendicular to the filter cloth and filter cake is the adhesive force, the magnitude of which is mainly determined by the material's viscosity; the force parallel to the filter cloth and filter cake is the adhesive shear force. In traditional filter presses, the filter cake needs to overcome this shear force to detach downwards from the vertically installed filter cloth. This shear force is greater than the material's adhesive force, making unloading from the longitudinally suspended filter cloth relatively difficult. In addition, as the filter cloth and filter cake rotate around the driven roller of the regular polygon, the gravitational component of the filter cake gradually increases with rotation (reaching its maximum value when the plane of the filter cloth / filter cake is horizontal and downward), which also increases the probability of the filter cake detaching from the filter cloth.

[0055] 2) In particular, even if there are still exceptions where small pieces of filter cake fail to detach and stick to the upper or lower filter cloth, since there is no relative displacement between the filter cake and the filter cloth, the undetached parts of the filter cake will remain in the internal position of the filter chamber during subsequent filter press cycles and will not fall into and / or get stuck between the filter plate sealing surfaces. Therefore, it will not affect the filter chamber sealing of the next working cycle, and will not cause the feed "slurry leakage" to cause equipment shutdown.

[0056] 3) Thus, the new filter press according to the present invention completely overcomes the shortcomings of traditional filter presses, such as incomplete unloading and frequent need to stop the machine to clean the filter cake manually. It is a filter press that can reliably achieve automatic continuous operation.

[0057] The novel filter press according to the present invention can be widely used in dewatering operations of various materials. In addition to the advantage of continuous automatic operation, it also has the advantages of intuitive inspection of the filter cloth and convenient and quick replacement and cleaning of the filter cloth.

Claims

1. A fully automatic filter press utilizing drum discharge, characterized in that... include: Rack (303), Mounted on rack (303): Vertical hydraulic cylinder (304), The driving roller (301) is a regular polygon. A driven roller (308) of a regular polygonal shape. Two conveyor chains (302) are wound around the drive roller (301) and the driven roller (308). Chain drive mechanism (312) is used to drive the drive roller (301) to rotate. Lower filter plate body (307), The upper filter plate (310) is fixed on the piston rod (305) of the vertical oil cylinder. Each of the two conveyor chains (302) includes multiple rigid large chain links (302A) and multiple small chain links (302B). Each large chain link (302A) is used to install the lower filter cloth (319), and each small chain link (302B) is used to accommodate the corresponding chamfers of the regular polygonal driving roller and driven roller. Each lower filter cloth (319) is clamped by multiple sets of bolts (320), two lower filter cloth pressure plates (321), and two lower filter cloth frames (323), and is connected to the corresponding large chain link (302A) of the two conveyor chains by the conveyor chain pin (322). The upper filter plate body (310) has a filtrate discharge pipe (311) and a feed pipe (309) welded to it. The filter plate diaphragm (313) has densely distributed protrusions. The gaps between these protrusions form the filtrate flow channel of the upper filter plate. The filtrate flow channel collects the filtrate into the filtrate discharge pipe (311) for discharge outside the machine. The filter plate diaphragm (313) is fixed to the upper filter plate body (310) by a diaphragm fixing plate (314). A diaphragm plate (326) is fixed to the upper filter plate body (310) through a filter plate diaphragm (313), and has multiple through holes (324) on it for discharging filtrate into the filtrate discharge pipe (311). The upper filter cloth (316) is fixed on the diaphragm fixing plate (314). The lower filter plate liner (318) is fixed to the lower filter plate body (307). The surface of the lower filter plate liner (318) is covered with lower filter cloth support bosses (328) and filtrate discharge grooves (329), and has multiple filtrate water drainage holes (330). The lower filter plate body (307) has a long drainage groove (331) for collecting the filtrate flowing out from the drainage holes (330) of the lower filter plate liner (318). A filtrate discharge pipe (306), welded below the drain hole (327) of the lower filter plate, is used to discharge the filtrate outside the filter press. Both the driving roller (301) and the driven roller (308) are regular quadrilaterals. The distance traveled by the conveyor chain in each working cycle is matched with the number of filter plate groups, that is: chain travel distance = number of filter plate groups × (filter plate width + filter plate spacing).

2. The fully automatic filter press with drum discharge according to claim 1, characterized in that: Number of filter cloths = Number of filter plate groups + 8.

3. The fully automatic filter press with drum discharge according to claim 1, characterized in that: Each lower filter cloth frame (323) includes multiple steel pipes (323A) and a long strip steel plate (323B), with each steel pipe (323A) welded to the long strip steel plate (323B) at a certain distance.

4. The fully automatic filter press according to claim 1, characterized in that: The boss (325) is a frustum-shaped boss.

5. The fully automatic filter press with drum discharge as described in claim 1, characterized in that: The filter plate diaphragm (313) is fixed to the upper filter plate body (310) by the first countersunk screw (315A) and the diaphragm fixing plate (314). The diaphragm plate (326) is fixed to the upper filter plate body (310) with a third countersunk screw (315C) across the filter plate diaphragm (313). The upper filter cloth (316) is fixed to the diaphragm fixing plate (314) with screws 317. The lower filter plate liner (318) is fixed to the lower filter plate body (307) by a second countersunk screw (315B). The lower filter cloth support boss (328) of the lower filter plate liner is long and narrow. Multiple filtrate drain holes (330) are provided on the center line of the width of the lower filter plate liner. The long drainage groove (331) of the lower filter plate body (307) is set at its width centerline. The filtrate flowing out from the drain hole (330) of the lower filter plate liner (318) is collected into the long drain trough (331) of the lower filter plate body, and then flows from the drain hole (327) of the lower filter plate body to the filtrate discharge pipe (306). A filtrate discharge pipe (306) is welded below the drain hole (327) of the lower filter plate for discharging filtrate outside the filter press.

6. The fully automatic filter press with drum discharge as described in claim 1, characterized in that... Further includes: Auxiliary unloading scraper mechanism (332).

7. A fully automatic solid-liquid separation method based on a fully automatic filter press according to any one of claims 1 to 6, characterized in that... include: A1) By extending the piston rod (305), the upper filter plate is pressed against the lower filter cloth (319) and the lower filter plate liner (318) by the filter plate diaphragm (314) and the upper filter cloth (316), forming a closed filter chamber. A2) The material is pumped into the closed filter chamber through the feed pipe (309) by a feed pump for pressurized filtration, and the filtrate is discharged through the upper filtrate discharge pipe (311) and the lower filtrate discharge pipe (306), forming a filter cake (333) in the filter chamber. A3) After the pressure filtration is completed, retract the piston rod (305) to open the filter chamber. A4) Start the chain power mechanism (312) to make the conveyor chain (302) rotate with the lower filter cloth (319) and filter cake (333) for unloading.

8. The fully automated solid-liquid separation method according to claim 7, characterized in that... Further includes: The material that has not fallen off is scraped off using the auxiliary unloading scraper mechanism (332).

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