Rotary drum vacuum press dewatering machine

Abstract

The present invention relates to a rotary drum vacuum pressing and dewatering machine, which comprises a frame, a vacuum rotary drum arranged on the frame, a feeding device arranged on the side of the vacuum rotary drum, upper and lower filter cloths, a driving device, and several vacuum pressing rollers; wherein, one vacuum pressing roller is tangent to the vacuum rotary drum, and the remaining vacuum pressing rollers are sequentially arranged behind the vacuum rotary drum; one end of the upper filter cloth winds around the vacuum rotary drum through the feeding device, then winds around several vacuum pressing rollers, goes upward through a discharging roller I and is connected with the other end thereof to form a closed loop; one end of the lower filter cloth bypasses several vacuum pressing rollers at the tangent position of the vacuum pressing roller and the vacuum rotary drum, goes downward through a discharging roller II and is connected with the other end thereof to form a closed loop; an extrusion and filtration sandwich layer is formed at the overlapping part of the upper and lower filter cloths with the vacuum rotary drum and several vacuum pressing rollers. The beneficial effects of the present invention are that under the dual action of shear force and vacuum, the moisture of the filter cloth can be better removed; the overall volume of the equipment is small, and excessive torque is not required, greatly reducing the energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum filtration, and particularly relates to a rotary drum vacuum pressing dewatering machine. Background Art

[0002] The traditional filter press is a belt filter press (see the appendix Figure 1 ). It is divided into a vacuum zone and a pressing zone. After the material is fed through the feed port 1, it undergoes vacuum filtration through the filter disk type 2 to form a filter cake, and then enters the pressing zone 3. After being pressed by multiple rollers, the filter cake is finally discharged through the discharge end 4. This equipment requires a large occupied space in the vacuum filtration area, and the rear pressing area simply relies on the shearing force of the rollers to remove moisture, resulting in poor filtration effect, high cost, and high energy consumption.

[0003] In the Chinese patent literature, the utility model with the name of "a vacuum filter with a filter pressing function" and the publication number of CN203678133U discloses a filtration system, including a vacuum drum, a first filter cloth, and a second filter cloth. One end of the first filter cloth bypasses the vacuum drum and multiple first guide rollers and is connected to its other end to form a closed ring. One end of the second filter cloth bypasses the vacuum drum and multiple second guide rollers and is connected to its other end to also form a closed ring. The part of the second filter cloth in contact with the vacuum drum covers the first filter cloth to form a filtration sandwich. The first filter cloth and the second filter cloth move in the same direction, and the first filter cloth and the second filter cloth are separated at the top of the vacuum drum. After separation, the first filter cloth is provided with a horizontal section as a material conveying section. The feeding system of the above technical solution conveys the material to the filter cloth through gravity sedimentation; in addition, the filter pressing of this solution mainly performs dehydration through vacuum and filter pressing; it has certain requirements for the volume of the vacuum drum; therefore, it has a large space and requires more torque, resulting in high energy consumption. Summary of the Invention

[0004] In view of the above-mentioned defects existing in the prior art, the present invention provides a rotary drum vacuum pressing dewatering machine, aiming to better remove the moisture on the filter cloth under the dual action of shearing force and vacuum; the overall volume of the equipment is small, without the need for excessive torque, and greatly reduces the energy consumption.

[0005] A rotary drum vacuum pressing dewatering machine of the present invention includes a frame, a vacuum drum arranged on the frame, a feeding device, upper and lower filter cloths, and a driving device on the side of the vacuum drum; it is characterized in that: it further includes several vacuum pressing rollers, wherein, one vacuum pressing roller is tangent to the vacuum drum, and the remaining vacuum pressing rollers are sequentially arranged behind the vacuum drum;

[0006] One end of the upper filter cloth winds around the vacuum drum through the feeding device, then winds around several vacuum pressing rollers, goes upward through the discharging roller I, and is connected to its other end to form a closed loop; one end of the lower filter cloth bypasses several vacuum pressing rollers at the tangent point of the vacuum pressing roller and the vacuum drum, goes downward through the discharging roller II, and is connected to its other end to form a closed loop.

[0007] The upper and lower filter cloths form an extrusion filtration sandwich layer at the overlapping part with the vacuum drum and several vacuum pressing rollers, and the separation part of the upper and lower filter cloths through the discharging roller is the discharging port.

[0008] The upper and lower filter cloths move synchronously, the overall movement directions are opposite, and they move in the same direction in the extrusion filtration sandwich layer.

[0009] Further, the upper filter cloth winds around 5 / 6 - 11 / 12 of the circumference of the vacuum drum, and the lower filter cloth winds around 3 / 4 - 1 / 6 of the circumference of the vacuum drum.

[0010] Further, a vacuum pipeline is arranged inside the vacuum pressing roller, and a vacuum adsorption port connected to the vacuum pipeline is arranged on the surface of the vacuum pressing roller; grooves are engraved on the surface of the vacuum pressing roller, and the grooves are connected to the vacuum adsorption port to form a vacuum area on the surface of the vacuum pressing roller.

[0011] Further, the vacuum pressing roller is at least composed of one pressing roller; the surface of the vacuum pressing roller is wrapped with filter cloth, and several vacuum pressing rollers are arranged in a staggered manner in sequence to form a zigzag structure.

[0012] Further, the feeding device includes a feeding hopper and an arc-shaped hopper. The arc-shaped hopper is sleeved on the vacuum drum and cooperates with the vacuum drum and the upper filter cloth to form a filter cake from the slurry.

[0013] Further, it further includes a scraping device arranged on the frame. The scraping device includes a scraping plate and a scraping fixing frame for fixing the scraping plate on the frame; the scraping plate is arranged at the discharging roller and contacts the filter cloth on the discharging roller to clean the filter cloth.

[0014] Further, it further includes a cleaning device. The cleaning device includes a cleaning spray head arranged on the frame and a water receiving tray located below the cleaning spray head; the cleaning device is arranged after the discharging port.

[0015] Further, it further includes tensioning devices respectively arranged at the upper and lower filter cloths. The tensioning device includes a tensioning cylinder, a tensioning rod with one end connected to the tensioning cylinder, and a tensioning wheel arranged on the side opposite to the tensioning cylinder on the tensioning rod; the other end of the tensioning rod is hinged on the frame.

[0016] Further, it further includes a liquid discharge tank. The vacuum pipeline of the vacuum pressing roller is connected to the liquid discharge tank. After the extracted waste liquid is stored in the liquid discharge tank, it is discharged through the liquid discharge tank.

[0017] Further, the vacuum pipeline of the vacuum press roll near the discharge port is connected to the high-pressure air tank, and high-pressure air is blown onto the upper and lower filter cloths through the vacuum suction ports.

[0018] The beneficial effects of the present invention are as follows: high degree of automation, capable of continuously completing functions such as feeding, suction filtration, pressing, and filter cloth regeneration, with extremely high production efficiency; integrating a ceramic filter press and a plate filter press, maximizing water removal; reasonable structure, low equipment failure rate, and convenient maintenance; small volume, low cost, low energy consumption, and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the prior art;

[0020] Figure 2 is a schematic overall structural diagram of an embodiment of the present invention;

[0021] Figure 3 is a schematic side structural diagram of an embodiment of the present invention;

[0022] Figure 4 is a schematic simplified structural diagram of an embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of the vacuum press roll of an embodiment of the present invention;

[0024] Figure 6 is a schematic cross-sectional view of the vacuum press roll of an embodiment of the present invention.

[0025] Among them, the above-mentioned drawings include the following reference numerals: 1, frame; 2, vacuum drum; 3, vacuum press roll; 4, upper filter cloth; 5, lower filter cloth; 61, feeding hopper; 62, arc-shaped hopper; 71, discharge roll I; 72, discharge roll II; 81, upper filter cloth cleaning spray head; 82, upper filter cloth water receiving tray; 83, lower filter cloth cleaning spray head; 91, tensioning cylinder; 92, tensioning wheel; 93, tensioning rod; 31, vacuum suction port; 32, vacuum pipeline; 33, groove; 10, redirecting roll; 11, deviation rectifying roll; 12, scraping plate; 13, liquid discharge tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the object and technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments.

[0027] As Figure 1-3 shown, a drum vacuum press dewatering machine includes a frame 1, a vacuum drum 2 arranged on the frame, a feeding device arranged on the side of the vacuum drum 2, upper and lower filter cloths 4 and 5, a driving device, and several vacuum press rolls 3; among them, one vacuum press roll 3 is tangent to the vacuum drum 2, and the remaining vacuum press rolls are sequentially arranged behind the vacuum drum 2.

[0028] One end of the upper filter cloth 4 is wound around the vacuum drum 2 through the feeding device, then passes around several vacuum pressing rollers 3, goes upward through the discharging roller I71, and is connected to its other end to form a closed loop; one end of the lower filter cloth 5 passes around several vacuum pressing rollers 3 at the tangent point of the vacuum pressing roller 3 and the vacuum drum 2, goes downward through the discharging roller II72, and is connected to its other end to form a closed loop.

[0029] The upper and lower filter cloths 4 and 5 form an extrusion filtration sandwich layer at the overlapping part with the vacuum drum 2 and several vacuum pressing rollers 3, and the separation part of the upper and lower filter cloths by the discharging roller is the discharging port; the upper and lower filter cloths move synchronously, the overall movement directions are opposite, and they move in the same direction in the extrusion filtration sandwich layer.

[0030] The upper filter cloth 4 is wound on 5 / 6 - 11 / 12 of the circumference of the vacuum drum 2, and the lower filter cloth 5 is wound on 3 / 4 - 1 / 6 of the circumference of the vacuum drum 2.

[0031] The driving device drives the upper and lower filter cloths to run synchronously. The slurry enters the slurry area of the vacuum drum through the feeding device, and solid-liquid separation is achieved under the vacuum action of the vacuum drum. Driven by the upper filter cloth, the filter cake formed after the preliminary dehydration of the slurry enters the wrapping area of the upper and lower filter cloths. The moisture in the filter cake is removed to the maximum extent through the repeated pressing of several groups of vacuum pressing rollers. The dehydrated filter cake continues to run under the driving device with the upper and lower filter cloths, and the filter cake is discharged by the discharging device (not shown in the figure) at the discharging roller.

[0032] Optionally, a vacuum pipeline 32 is provided inside the vacuum pressing roller 3, and a vacuum adsorption port 31 connected to the vacuum pipeline 32 is provided on the surface of the vacuum pressing roller 3; grooves 33 are engraved on the surface of the vacuum pressing roller 3, and the grooves are connected to the vacuum adsorption port to form a vacuum area on the surface of the vacuum pressing roller. In this embodiment, while retaining the shearing force of the pressing roller, the function of vacuum pumping is added inside the pressing roller. Through the dual action of the shearing force and the vacuum pumping force of the vacuum pressing roller, the moisture in the filter cake and the moisture extruded into the filter cloth are better removed; in addition, the filtrate generated by extrusion is directly pumped away by the vacuum pipeline 32, no waste liquid is formed, and environmental pollution is reduced. Grooves are engraved on the surface of the vacuum drum, and the grooves are communicated with the vacuum pipeline through the vacuum adsorption port to form a fixed vacuum area on the surface of the drum, realizing continuous vacuum pumping in a fixed area.

[0033] Optionally, the vacuum pipeline of the vacuum pressing roller 3 near the discharging port is connected to a high-pressure air tank, and high-pressure air is blown onto the upper and lower filter cloths through the vacuum adsorption port. As another embodiment of the present invention, in order to better clean the materials on the upper and lower filter cloths, high-pressure air can be connected to the last group of vacuum pressing rollers. The vacuum pressing roller with high-pressure air is set according to the moisture condition of the materials. The materials attached to the upper and lower filter cloths are blown off by blowing high-pressure air onto the upper and lower filter cloths.

[0034] Optionally, the vacuum press roll 3 is composed of at least one press roll; the surface of the vacuum press roll is wrapped with filter cloth, and several vacuum press rolls are arranged in a staggered manner in sequence to form several zigzag structures. In this embodiment, the surface of the vacuum drum is wrapped with filter cloth, and the filter cake is directly adsorbed on the filter cloth by the rotation of the vacuum drum 2; the pressing part of the vacuum press roll 3 is composed of several rolls, and the number of press rolls can be expanded according to the requirements of specific processes or material characteristics to improve water absorption. Several vacuum press rolls 3 form several smooth zigzag structures for the upper and lower filter cloths 4 and 5, so that the filter cake is repeatedly pressed by the vacuum press rolls under the wrapping of the upper and lower filter cloths.

[0035] Optionally, the feeding device includes a feeding hopper 61 and an arc-shaped hopper 62. The arc-shaped hopper 62 is sleeved on the vacuum drum 2 and is used in cooperation with the vacuum drum 2 and the upper filter cloth 4 to form a filter cake from the slurry. As another embodiment of the present invention, one end of the upper filter cloth winds around the vacuum drum through the feeding device, then winds around several vacuum press rolls, goes upward through the discharging roll I and is connected to its other end to form a closed loop; one end of the lower filter cloth passes through the end of the arc-shaped hopper, bypasses several vacuum press rolls after passing through the tangent point between the vacuum press roll and the vacuum drum, goes downward through the discharging roll II and is connected to its other end to form a closed loop; in this embodiment, the upper and lower filter cloths meet outside the arc-shaped hopper, are pressed by the vacuum press roll and then discharged through the discharging roll. Among them, the radian of the arc-shaped hopper is greater than 180 degrees and less than 270 degrees.

[0036] Optionally, it further includes a scraping device arranged on the frame. The scraping device includes a scraping plate 12 and a scraping fixing frame for fixing the scraping plate 12 on the frame; the scraping plate is arranged at the discharging rolls 71 and 72 and contacts the filter cloth on the discharging rolls to clean the filter cloth.

[0037] Optionally, it further includes a cleaning device. The cleaning device includes an upper filter cloth cleaning nozzle 81 arranged on the frame for cleaning the upper filter cloth and an upper filter cloth water receiving tray 82 located below the upper filter cloth cleaning nozzle; and a lower filter cloth cleaning nozzle 83 for cleaning the lower filter cloth and a lower filter cloth water receiving tray (not shown in the figure) located below the lower filter cloth cleaning nozzle; the cleaning device is arranged after the discharging port.

[0038] Optionally, it further includes tensioning devices respectively arranged at the upper and lower filter cloths. The tensioning device includes a tensioning cylinder 91, a tensioning rod 93 with one end connected to the tensioning cylinder, and a tensioning wheel 92 arranged on the tensioning rod on the opposite side of the tensioning cylinder; the other end of the tensioning rod is hinged on the frame.

[0039] Optionally, it further includes a liquid discharge tank. The vacuum pipeline 32 of the vacuum press roll 3 is connected to the liquid discharge tank 13. After the extracted waste liquid is stored in the liquid discharge tank, it is discharged through the liquid discharge tank.

[0040] Optionally, another embodiment of the present invention further includes a redirecting roller 10 disposed at the ends of the upper and lower filter cloths for changing the movement direction of the filter cloth; and an alignment roller 11 for correcting the offset of the upper and lower filter cloths.

[0041] The working process of this equipment is as follows: When the equipment runs, the driving device drives the upper and lower filter cloths to run synchronously. The slurry enters the vacuum drum slurry pool from the feeding hopper, and solid-liquid separation is achieved under the action of vacuum. Driven by the upper filter cloth, the formed filter cake enters several groups of vacuum pressing rollers and is repeatedly pressed under the wrapping of the upper and lower filter cloths. The squeezed water is instantly pumped away, and the filtrate is pumped from inside the roller through a pipeline to the drainage tank and then automatically discharged; the dewatered filter cake continues to run synchronously with the upper and lower filter cloths, and the filter cake is discharged by the discharging device at the discharging roller. After the filter cloth after discharging the filter cake is cleaned by the cleaning device, it is regenerated, and then enters the feeding hopper again after passing through the alignment device and the tensioning device, entering the next filtration cycle.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any equivalent modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of the patent of the present invention.

Claims

1. A drum vacuum pressing and dewatering machine, comprising a frame (1), a vacuum drum (2) arranged on the frame, a feeding device arranged on the side of the vacuum drum, upper and lower filter cloths (4, 5) and a driving device; characterized in that: It further includes several vacuum press rolls (3), wherein one vacuum press roll (3) is tangent to the vacuum drum (2), and the remaining vacuum press rolls are sequentially arranged behind the vacuum drum; One end of the upper filter cloth (4) winds around the vacuum drum through the feeding device, then winds around several vacuum press rolls, goes upward through the discharging roll I (71) and is connected to its other end to form a closed loop; one end of the lower filter cloth (5) bypasses several vacuum press rolls at the tangent position of the vacuum press roll and the vacuum drum, goes downward through the discharging roll II (72) and is connected to its other end to form a closed loop; The upper and lower filter cloths form an extrusion filtration sandwich layer at the overlapping part with the vacuum drum and several vacuum press rolls, and the separation part of the upper and lower filter cloths by the discharging roll is the discharging port; The upper and lower filter cloths move synchronously, the overall movement directions are opposite, and they move in the same direction in the extrusion filtration sandwich layer; The upper filter cloth (4) winds around 5 / 6 - 11 / 12 of the circumference of the vacuum drum (2), and the lower filter cloth (5) winds around 3 / 4 - 1 / 6 of the circumference of the vacuum drum (2); The vacuum press roll (3) is at least composed of one press roll; the surface of the vacuum press roll is wrapped with filter cloth, and several vacuum press rolls are sequentially arranged in a staggered manner to form a zigzag structure; The feeding device includes a feeding hopper (61) and an arc-shaped hopper (62), the arc-shaped hopper is sleeved on the vacuum drum, and cooperates with the vacuum drum and the upper filter cloth to form a filter cake from the slurry.

2. The drum vacuum pressing and dewatering machine according to claim 1, wherein The inside of the vacuum press roll (3) is provided with a vacuum pipeline (32), and the surface of the vacuum press roll is provided with a vacuum adsorption port (31) connected to the vacuum pipeline; the surface of the vacuum press roll is engraved with grooves (33), and the grooves connect the vacuum adsorption ports to form a vacuum area on the surface of the vacuum press roll.

3. The drum vacuum pressing and dewatering machine according to claim 1, wherein It further includes a scraping device arranged on the frame, and the scraping device includes a scraping plate (10) and a scraping fixing frame for fixing the scraping plate on the frame; the scraping plate is arranged at the discharging roll and contacts the filter cloth on the discharging roll to clean the filter cloth.

4. The drum vacuum pressing and dewatering machine according to claim 1, wherein It further includes a cleaning device, and the cleaning device includes a cleaning spray head arranged on the frame and a water receiving tray located below the cleaning spray head; the cleaning device is arranged after the discharging port.

5. The drum vacuum pressing and dewatering machine according to claim 1, characterized in that, It further includes tensioning devices respectively arranged at the upper and lower filter cloths, and the tensioning devices include tensioning cylinders (91), tensioning rods (93) with one end connected to the tensioning cylinders, and tensioning wheels (92) arranged on the tensioning rods on the opposite side of the tensioning cylinders; the other end of the tensioning rod is hinged on the frame.

6. The drum hollow pressing and dewatering machine according to claim 2, characterized in that, It further includes a liquid discharge tank, and the vacuum pipeline of the vacuum press roll is connected to the liquid discharge tank (13), and after the extracted waste liquid is stored in the liquid discharge tank, it is discharged through the liquid discharge tank.

7. The drum-type hollow pressing and dewatering machine according to claim 2, characterized in that, The vacuum pipeline of the vacuum press roll near the discharging port is connected to a high-pressure air tank, and high-pressure air is blown to the upper and lower filter cloths through the vacuum adsorption ports.

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