Pre-dehydrator with double moving ring filter bodies

Abstract

According to the pre-dehydrator of the double-moving-ring filter body, the pre-dehydrator is arranged behind a flocculation mixing tank, and the head end of the pre-dehydrator is in butt joint with the flocculation mixing tank; the pre-dehydrator comprises a filtrate tank and a filter cavity arranged above the filtrate tank; the filtering cavity is inclined downwards from the head end to the tail end; the filtering cavity comprises one or more sections of filtering units; each section of filter unit comprises a filter element; the filtering section is formed by alternately stacking two groups of movable rings with different motion trails. By means of the design of the double movable rings, leaked mud on the periphery of the outer portion of the filtering cavity can be cleared away in time, the structural design is simple and compact, materials do not need to be pushed forward through a spiral shaft, energy consumption is effectively reduced, and the effect of saving energy and electricity is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of solid-liquid separation equipment, and specifically refers to a pre-dehydrator of a double-moving ring filter body. Background Art

[0002] The dewatering treatment for sludge generally includes: a flocculation process, in which a flocculant is used to flocculate the sludge; and a dewatering process, in which the flocculated sludge is dewatered by a dewatering machine.

[0003] The sludge and flocculant are initially mixed in the flocculation mixing tank and then enter from the bottom of the tank. The stirring blades installed in the flocculation mixing tank further mix the sludge and flocculant. When the sludge reaches the high position of the flocculation mixing tank, it forms stable flocs under the action of the flocculant and flows into the laminated spiral dewatering machine from the mud outlet on the top of the flocculation mixing tank wall by gravity for dewatering. The flocculation mixing tank is the front equipment of the laminated spiral dewatering machine. Generally, one flocculation mixing tank is connected to one or more spiral dewatering machines.

[0004] The method in which the flocculants in the flocculation mixing tank directly flow into the stacked spiral dewatering machine for dewatering has the following disadvantages: 1. There is a spiral shaft in the filter chamber of the dewatering machine, and the filter chamber is tilted upward or arranged in parallel. The material is mainly pushed by the spiral shaft. Because of the existence of the spiral shaft, the space inside the filter chamber is occupied, making the effective filtration space and even the filtration gap smaller. Secondly, the spiral shaft has low pushing efficiency and even transportation uncertainty for materials with high fluidity and low concentration. In addition, the existence of the spiral shaft will also break up the flocs, resulting in more mud leakage. 2. The filter chamber of the traditional dewatering machine basically adopts the form of stacked fixed rings and movable rings, and the serial holes of the ring plates are set outside the cavity, which easily leads to the retention and accumulation of leaked mud around the cavity, and the movable ring cannot cut into the mud layer to shear the sludge, resulting in limited filtering and dewatering effects.

[0005] In addition, the flocculation mixing tank and the dewatering machine in the prior art are connected by a retractable mud inlet pipe. The use of this mud inlet pipe has the following disadvantages: 1. The flocculated sludge flows directly to the dewatering machine, which brings great water filtering pressure to the dewatering machine body. Due to the limited water filtering efficiency, the processing volume is small and the water content is high. 2. The retractable mud inlet pipe is prone to leakage, collapse and even blockage. 3. If the dewatering machine body cannot filter the water in time, it is necessary to select a dewatering machine with a larger processing capacity, which leads to an increase in investment costs. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a pre-dehydrator of a double-moving ring filter body, which is connected after a flocculation mixing tank to pre-dehydrate flocculates.

[0007] The present invention is achieved in that:

[0008] A pre-dehydrator for a double-moving ring filter, the pre-dehydrator is arranged after a flocculation mixing tank, and its head end is butted against the flocculation mixing tank;

[0009] The pre-dehydrator comprises: a filtrate tank and a filter cavity arranged above the filtrate tank; the filter cavity is arranged to be inclined downward from the head end to the tail end;

[0010] The filter chamber includes one or more filter units;

[0011] Each section of the filtering unit includes: support plates on both sides and a filtering section in the middle, the filtering section includes two groups of movable rings with different motion trajectories stacked alternately, and each adjacent two different groups of movable rings produce staggered motion with relative displacement to keep the filter seam unobstructed and achieve effective solid-liquid separation; the movable rings of each group are provided with two or more serial connection holes; the movable rings of each group are connected into a movable body through a serial connection rod set in the serial connection hole;

[0012] Each group of the movable rings in each filtering section has two or more groups of the guide plates;

[0013] The two movable bodies drive the guide plates through a driving device to realize the interlaced movement of the two groups of movable rings to produce relative displacement;

[0014] Two adjacent movable rings in one group are separated by a gasket sleeved on the series connecting rod, and the thickness of the movable rings in the other group is smaller than the thickness of the gasket, so as to form a filtering gap.

[0015] Furthermore, the driving device comprises: a motor, a gear transmission mechanism, and two or more active rods;

[0016] The motor is connected to the two or more active rods through the gear transmission mechanism to make them move at the same speed and in the same direction, and each active rod is connected to the guide plate through an eccentric device sleeved thereon;

[0017] Each group of the guide plates drives one group of the movable rings to move along the same motion trajectory;

[0018] Each of the guide plates in the same group has an annular hole matching the movable ring structure in the same group, and is provided with an eccentric device with the same eccentric direction and eccentric distance connected to the active rod; the eccentric devices provided on the guide plates in different groups have different eccentric directions and eccentric distances;

[0019] The entire filter cavity shares one set of the driving device;

[0020] The two support plates on both sides of each filtering segment are fixed into a frame structure by a plurality of support rods arranged around the periphery of the filtering segment;

[0021] Each of the support plates has a bearing through which the two or more active rods that allow reciprocating circular motion pass, and has an annular hole that matches the shape and position of the movable ring;

[0022] Each of the support plates is fixedly arranged on the filtrate tank.

[0023] Furthermore, the eccentric devices are all arranged at the upper end of the guide plate.

[0024] Furthermore, the serial connection hole on each movable ring in the same group of movable rings is located on the inner side of the ring piece of the movable ring to avoid mud leakage and retention on the periphery of the ring piece.

[0025] Furthermore, the gear transmission mechanism is arranged in a gear box, and the motor is arranged on a side of the gear box close to the filter cavity.

[0026] Furthermore, a gate valve for controlling the flow rate is arranged at the end of the pre-dehydrator, and the gate opening and closing of the gate valve is designed from top to bottom.

[0027] Furthermore, the bottom of the filtrate tank is connected to a filtrate guide pipe serving as a support.

[0028] Furthermore, the end of the pre-dehydrator is connected to the inlet of a laminated spiral dehydrator body.

[0029] The advantages of the present invention are:

[0030] 1. Its structural design is simple and compact, and it does not need to use a screw shaft to push the material forward, which effectively reduces energy consumption and achieves energy-saving and power-saving effects;

[0031] 2. The material can be transported naturally and smoothly under the action of gravity, and the interference caused by the stirring of the spiral shaft is completely avoided during the transportation process, making the filtrate cleaner and clearer;

[0032] 3. The filter cavity is lower than the liquid level in the flocculation mixing tank, and the filter cavity is filled with sludge. The all-round filter gaps can be fully utilized, and the filtrate effect is better.

[0033] 4. The design of double movable rings can timely clean the leaked mud around the outside of the filter cavity, and can always keep the filter seam in a transparent and clean state without the help of a spray device. Moreover, since the relative displacement between the double movable rings is uniform and large in all directions, it can ensure a large and stable output of the filtrate.

[0034] 5. The multi-section filter unit design adopts segmented serial rod connection, which can reduce the load of the serial rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0036] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0037] Figure 2 It is a schematic diagram of the explosion structure of the filter cavity in the present invention.

[0038] Figure 3 It is a schematic structural diagram of the movable ring of group A in the present invention.

[0039] Figure 4 It is a schematic structural diagram of the movable ring of group B in the present invention.

[0040] Figure 5 It is a schematic structural diagram of the guide plate group A in the present invention.

[0041] Figure 6 It is a schematic structural diagram of the guide plate group B in the present invention.

[0042] Figure 7 It is a left side view of the filter cavity in the present invention.

[0043] Figure 8 It is a schematic structural diagram of the second embodiment of the present invention. DETAILED DESCRIPTION

[0044] like Figure 1 As shown, a pre-dehydrator 100 of a double-moving ring filter body is arranged after a flocculation mixing tank 200, and its head end is connected to the flocculation mixing tank 200.

[0045] like Figures 2 to 7 As shown, the pre-dehydrator 100 comprises: a filtrate tank 1 and a filter cavity 2 arranged above the filtrate tank 1; the filter cavity 2 is arranged to be inclined downward from the head end to the tail end;

[0046] The filter cavity 2 in this embodiment has only one filter unit. In practice, the filter cavity 2 can be configured as a plurality of filter units as required.

[0047] Each filter unit includes two support plates 21 on both sides and a filter section 22 in the middle. Each filter section 22 includes two groups of movable rings with different motion trajectories, A ring group and B ring group, which are stacked alternately. Each adjacent two A rings and B rings produce a staggered motion with relative displacement to keep the filter seam unobstructed and achieve effective solid-liquid separation. (To avoid confusion in the drawing, Figure 1Only a small section of the ring is shown. )

[0048] like Figure 2 and Figure 3 As shown, the A ring piece and the B ring piece are square, the A ring piece is provided with a series connection hole A1 and a series connection hole A2 at the upper right and lower left ends of the diagonal of the square ring piece facing inward, the B ring piece is provided with a series connection hole B1 and a series connection hole B2 at the upper left and lower right ends of the diagonal of the square ring piece facing inward, the series connection hole A1 of the A ring piece group is sleeved with a series connection rod A11, and the series connection hole A2 is sleeved with a series connection rod A21 to connect all the A ring piece groups in series into one movable body, and the series connection hole B1 of the B ring piece group is sleeved with a series connection rod B11, and the series connection hole B21 is sleeved with a series connection rod B2 to connect all the B ring piece groups in series into another movable body;

[0049] Each group of movable rings in each filter section has a group of three guide plates (group A guide plates A4 and group B guide plates B4);

[0050] The two movable bodies drive the guide plates through a driving device to realize the staggered movement of the A ring plate group and the B ring plate group to produce relative displacement;

[0051] Two adjacent A ring sheets are separated by a gasket B31 sleeved on the serial rod B11 and a gasket B32 sleeved on the serial rod B21. The thickness of the A ring sheet is smaller than that of the gaskets B31 and B32, forming a filtering gap.

[0052] The serial connection hole is arranged on the inner side of the ring piece of the movable ring to avoid the retention of leakage mud on the outer side of the ring piece. During the filtering process, the retention of leakage mud will cause the filtration cavity to be blocked. If the serial connection hole is arranged on the outer side of the ring piece, a certain degree of retention is inevitable. In the present invention, the serial connection hole is arranged on the inner side of the ring piece. On the one hand, it can avoid the accumulation of leakage mud outside the filtration cavity. On the other hand, it can also flush out the internal leakage mud by means of the inclined setting of the filtration cavity, ensuring that the inside of the filtration cavity remains clean.

[0053] The driving device comprises: a motor 3, a gear transmission mechanism 4, and two active rods 5;

[0054] The motor 3 is connected to two active rods 5 through a gear transmission mechanism 4 to make them move at the same speed and in the same direction. Each active rod 5 is connected to the guide plate A4 of group A and the guide plate B4 of group B through an eccentric device 6 sleeved thereon;

[0055] In the filter section of this embodiment, the A ring sheet group has three guide sheets A4, and the B ring sheet group has three guide sheets B4. The three guide sheets A4 drive the A ring sheet group to move in the same motion track, and the three guide sheets B4 drive the B ring sheet group to move in the same motion track.

[0056] Below the guide plate A4 is a ring plate with the same structure as the movable ring of group A, and two eccentric devices 6 with the same eccentric direction and eccentric distance are arranged above it and connected to the active rod 5. Below the guide plate B4 is a ring plate with the same structure as the movable ring of group B, and two eccentric devices 6 with the same eccentric direction and eccentric distance are arranged side by side above it and connected to the active rod 5; the eccentric directions and eccentric distances of the eccentric devices 6 arranged on the guide plates A4 and B4 are different, so that the two groups of movable rings produce different motion trajectories. The eccentric device 6 in this embodiment is arranged above the filter cavity. If it is arranged below, the eccentric device 6 is easily affected by the filtrate, causing corrosion or failure, and it is inconvenient to observe, operate and repair. The gear transmission mechanism 4 will also be at risk of being affected by the filtrate, and it will increase the difficulty of installation and sealing.

[0057] The entire filter cavity shares a set of driving devices; in specific practice, the number of active rods 5 can be more than two, and the number of eccentric devices 6 above each guide plate can also be more than two accordingly.

[0058] The two support plates 21 on both sides of the filter section are fixedly connected by a plurality of support rods 7 arranged around the periphery of the filter section; the upper end of each support plate 21 has a bearing 8 through which two active rods 5 that allow reciprocating circular motion pass, and the lower end has an annular hole that matches the shape of the movable ring. This reciprocating circular motion method has a long interaction distance between the ring pieces, which can make the filtrate smooth.

[0059] Each support plate 21 is fixedly disposed on the filtrate tank 1 .

[0060] The gear transmission mechanism 4 is arranged in a gear box 41, and the motor 3 is arranged on the side of the gear box 41 close to the filter cavity, which can effectively utilize the space and shorten the overall length of the filter cavity. The gear box 41 is arranged at the rear end of the filter cavity and acts as a support plate 21. The upper end thereof has a bearing 8 through which two active rods 5 that allow reciprocating circular motion pass, and the lower end has an annular hole that matches the shape of the movable ring.

[0061] A gate valve 9 for controlling the flow rate is arranged at the end of the pre-dehydration machine 100. The gate opening and closing of the gate valve 9 is designed from top to bottom. The gate valve 9 is designed to be able to flexibly adjust the processing volume and moisture content of the pre-dehydration.

[0062] The bottom of the filtrate tank 1 is connected to a filtrate guide tube 10 as a support. This design can not only support the filtrate tank and the filter cavity thereon, but also serve as a filtrate guide tube, which is quite clever and practical.

[0063] During operation, the floccules formed in the flocculation mixing tank 200 enter the inclined filter cavity through the opening at the head end of the filter cavity of the pre-dehydrator 100. Under the action of gravity, the floccules and the water flow forward, and the two sets of movable rings continue to move relative to each other, so that most of the water is smoothly discharged from the filter seam to the filtrate tank 1, and then discharged through the guide pipe 10. Even if there is a small amount of leaked mud, the uninterrupted movement of the movable ring can move the leaked mud to one side until it finally falls, thereby always maintaining the cleanliness and transparency of the filter seam. After being processed by the pre-dehydrator 100, the moisture content of the material is significantly reduced, achieving the effect of pre-dehydration. A gate valve 9 that opens and closes from top to bottom is set at the end of the pre-dehydrator 100. By reasonably adjusting its opening and closing state, the water content and processing volume of the treated material can be stably and accurately controlled, so that it can achieve a more ideal pre-dehydration effect.

[0064] The structural design of the present invention is simple and compact, and does not require the use of a screw shaft to propel the material forward, which effectively reduces energy consumption and achieves energy-saving and power-saving effects. The material can be transported naturally and smoothly under the action of gravity, and the interference caused by the stirring of the screw shaft is completely avoided during the transportation process, making the filtrate cleaner and clearer; the design of the double movable ring can clean the leaked mud around the outside of the filter cavity in time, and the filter seam can always be kept in a transparent and clean state without the help of a spray device. Moreover, since the all-round relative displacement between the double movable rings is uniform and large in amplitude, it can ensure a large flow rate and stable output of the filtrate.

[0065] like Figure 8As shown, in another embodiment, the tail end of the pre-dehydrator 100 is connected to a dehydrator 300 with a filter chamber tilted upward, which has significant advantages: first, since the moisture content of the material passing through the pre-dehydrator 100 has been reduced, it is easier to be pushed forward in the dehydrator 300, and the extrusion effect will be more ideal, and the space where the original retractable mud inlet pipe is located can be cleverly utilized for efficient filtration, which greatly enhances the water filtration effect and provides strong support for subsequent further dehydration processes, which not only significantly increases the processing capacity, but also can effectively reduce the moisture content of the material; secondly, it completely eliminates a series of problems caused by leakage, collapse and blockage of the mud inlet pipe, ensuring the stable and smooth operation of the entire pre-dehydration process, greatly improving production efficiency and equipment reliability, reducing maintenance costs and downtime risks, and providing a more reliable and efficient solution for related production operations. Thirdly, the entire pre-dehydrator 100 is located below the liquid level of the dehydrator 300 and is tilted toward the end. This unique design allows more solids to settle and gather at the bottom of the filter cavity and slide along the tilt direction of the filter cavity, ensuring that the filter seam at the bottom of the filter cavity is permeable, while the upper part has less solid content and better permeability, and can fully utilize the filter seam at the top of the filter cavity to filter water. Therefore, the filter seam of the filter cavity can be fully utilized, thereby maximizing the filtering efficiency.

[0066] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A pre-dehydrator with double moving ring filter, characterized in that: The pre-dehydrator is arranged after the flocculation mixing tank, and its head end is butted with the flocculation mixing tank; The pre-dehydrator comprises: a filtrate tank and a filter cavity arranged above the filtrate tank; the filter cavity is arranged to be inclined downward from the head end to the tail end; The filter chamber includes one or more filter units; Each section of the filtering unit includes: support plates on both sides and a filtering section in the middle, the filtering section includes two groups of movable rings with different motion trajectories stacked alternately, and each adjacent two different groups of movable rings produce staggered motion with relative displacement to keep the filter seam unobstructed and achieve effective solid-liquid separation; the movable rings of each group are provided with two or more serial connection holes; the movable rings of each group are connected into a movable body through a serial connection rod set in the serial connection hole; Each group of the movable rings in each filtering section has two or more groups of the guide plates; The two movable bodies drive the guide plates through a driving device to realize the interlaced movement of the two groups of movable rings to produce relative displacement; Two adjacent movable rings in one group are separated by a gasket sleeved on the series connecting rod, and the thickness of the movable rings in the other group is smaller than the thickness of the gasket, so as to form a filtering gap.

2. A pre-dehydrator with double moving ring filter as claimed in claim 1, characterized in that: The driving device comprises: a motor, a gear transmission mechanism, and two or more active rods; The motor is connected to the two or more active rods through the gear transmission mechanism to make them move at the same speed and in the same direction, and each active rod is connected to the guide plate through an eccentric device sleeved thereon; Each group of the guide plates drives one group of the movable rings to move along the same motion trajectory; Each of the guide plates in the same group has an annular hole matching the movable ring structure in the same group, and is provided with an eccentric device with the same eccentric direction and eccentric distance connected to the active rod; the eccentric devices provided on the guide plates in different groups have different eccentric directions and eccentric distances; The entire filter cavity shares one set of the driving device; The two support plates on both sides of each filtering segment are fixed into a frame structure by a plurality of support rods arranged around the periphery of the filtering segment; Each of the support plates has a bearing through which the two or more active rods that allow reciprocating circular motion pass, and has an annular hole that matches the shape and position of the movable ring; Each of the support plates is fixedly arranged on the filtrate tank.

3. A pre-dehydrator with double moving ring filter as claimed in claim 2, characterized in that: The eccentric devices are all arranged at the upper end of the guide plate.

4. A pre-dehydrator with double moving ring filter as claimed in claim 2, characterized in that: The serial connection hole on each movable ring in the same group of movable rings is located on the inner side of the ring piece of the movable ring to prevent mud leakage from being retained on the periphery of the ring piece.

5. A pre-dehydrator with double moving ring filter as claimed in claim 2, characterized in that: The gear transmission mechanism is arranged in a gear box, and the motor is arranged on a side of the gear box close to the filter cavity.

6. A pre-dehydrator with double moving ring filter as claimed in claim 1, characterized in that: A gate valve for controlling the flow rate is arranged at the end of the pre-dehydrator, and the gate opening and closing of the gate valve is designed from top to bottom.

7. A pre-dehydrator with double moving ring filter as claimed in claim 1, characterized in that: The bottom of the filtrate tank is connected to a filtrate guide pipe serving as a support.

8. A pre-dehydrator with double moving ring filter as claimed in claim 1, characterized in that: The end of the pre-dehydrator is connected to the inlet of a laminated spiral dehydrator body.

Images