A pulp filtering device

Abstract

The invention discloses a pulp filtering device, comprising a filter cartridge, a liquid inlet pipe and a liquid outlet pipe are respectively installed on the side walls of the filter cartridge, a filter screen is movably installed in the filter cartridge, a sealing ring is fixed on the outside of the filter screen, the sealing ring is in sliding contact with the inner wall of the filter cartridge, a sleeve is fixed at the center of the filter screen, a hydraulic cylinder is installed on the top of the filter cartridge, a rotating motor is installed on the piston end of the hydraulic cylinder, an impeller is respectively installed on the outside of both ends of the sleeve through a bearing, the output end of the rotating motor is connected to the bearing, the impeller is in sliding contact with the surface of the filter screen, and a negative pressure cleaning mechanism matched with the impeller is respectively installed on the top and bottom of the filter cartridge. The invention can improve the deficiencies of the prior art, has a compact structure and high filtering efficiency.

Description

Technical Field

[0001] The invention relates to a papermaking device, in particular to a pulp filtering device. Background Art

[0002] In the papermaking process, the pulp needs to be filtered to remove impurities in the pulp. During the filtering process, impurities will cover the filter screen, causing the filter screen to be blocked, which requires the filter screen to be cleaned. In the prior art, a variety of technical solutions for automatically cleaning the filter screen are disclosed, but the existing cleaning devices are large in size and complex in structure, and need to be improved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a pulp filtering device, which solves the shortcomings of the prior art and has a compact structure and high filtering efficiency.

[0004] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0005] A pulp filtering device comprises a filter cartridge, wherein a liquid inlet pipe and a liquid outlet pipe are respectively installed on the side walls of the filter cartridge, a filter screen is movably installed in the filter cartridge, a sealing ring is fixed on the outside of the filter screen, the sealing ring is in sliding contact with the inner wall of the filter cartridge, a sleeve is fixed at the center of the filter screen, a hydraulic cylinder is installed on the top of the filter cartridge, a rotating motor is installed on the piston end of the hydraulic cylinder, an impeller is respectively installed on the outside of both ends of the sleeve through a bearing, the output end of the rotating motor is connected to the bearing, the impeller is in sliding contact with the surface of the filter screen, and negative pressure cleaning mechanisms matching the impeller are respectively installed on the top and bottom of the filter cartridge.

[0006] Preferably, the impeller includes a base sleeved on the outside of the bearing, a plurality of blades are fixed on the outside of the base, an inclined portion is provided on the side of the bottom edge of the blade facing away from the rotation of the impeller, a groove is provided on the side of the blade facing the rotation of the impeller, a plurality of notches are provided on the bottom edge of the blade, a guide plate is horizontally provided on the inclined portion, through holes corresponding to the notches are provided on the guide plate, the axis of the through hole is coplanar with the center line of the notch, partitions are fixed between adjacent through holes, a horizontal through groove is provided on the top of the partition, and the height of the through groove gradually increases from a position close to the through hole to a position away from the through hole.

[0007] Preferably, the ratio of the diameter of the through hole to the width of the notch is 1:6, and the ratio of the length of the partition to the spacing between adjacent partitions is 2:3.

[0008] Preferably, the negative pressure cleaning mechanism includes an outer cover connected to a negative pressure suction tube, a first receiving groove for receiving the base and a second receiving groove for receiving the blades are arranged inside the outer cover, and jet holes are arranged inside the first receiving groove and the second receiving groove.

[0009] Preferably, a negative pressure suction tube is connected to the outer side of each second receiving groove, the jet holes in the first receiving groove are arranged horizontally, the jet holes in the first receiving groove face the axis of the base, and the jet holes in the second receiving groove face the groove.

[0010] Preferably, the height of the inner cavity of the negative pressure suction tube gradually increases from the inlet to the inside, and the top wall of the inner cavity of the negative pressure suction tube is provided with an arc surface portion.

[0011] The beneficial effects brought about by the above technical solution are: the present invention adopts an active filter pressing method to filter the pulp, and drives the filter screen to move in the filter cartridge through a hydraulic cylinder, thereby filtering the pulp in the filter cartridge. Compared with the traditional method of filtering by the gravity of the pulp, the filtering efficiency is improved. At the same time, the rotary motor drives the impeller to rotate, and the blades clean the impurities attached to the surface of the filter screen in real time. After the impeller moves to the negative pressure cleaning mechanism, the negative pressure cleaning mechanism cleans the impurities on the impeller during the time period when the filtered pulp is discharged and the filtered pulp is injected, and then the hydraulic cylinder drives the filter screen to move in the opposite direction to carry out the next round of pulp filtration. The entire filtering and cleaning process has strong continuity, saves time, and effectively improves the filtering efficiency.

[0012] The entire filtering device of the present invention is installed in the filter cartridge and on the surface of the filter cartridge. The equipment occupies a small area and has a compact structure. The groove on the blade is used to store impurities cleaned from the filter screen surface. When the blade moves relative to the filter screen, the water flows to the inclined surface through the notch. Under the flow restriction of the guide plate, turbulence is formed in the inclined surface area, thereby disturbing and flushing the impurities that are not cleaned by the blade and remain on the filter screen surface, and preventing the impurities from being repeatedly pressed on the filter screen surface to form a covering layer due to not being cleaned in time. The partition is used to increase the relative flow velocity in the notch area. The purpose of opening the through hole is to form an upward flow trend at the top of the inclined surface. At the same time, the through groove can accelerate the flow velocity of the fluid in the area below the inclined surface, thereby improving the cleaning effect. The negative pressure cleaning mechanism uses negative pressure suction to clean the collected impurities. The notch at the bottom guides the airflow ejected from the jet hole, reduces the turbulence formed by the airflow at the groove, and thus improves the suction efficiency of the negative pressure suction tube for impurities. By optimizing the inner cavity structure of the negative pressure suction tube, the suction effect of impurities can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of a specific implementation mode of the present invention.

[0014] Figure 2 It is a structural diagram of a blade in a specific embodiment of the present invention.

[0015] Figure 3 It is a partial enlarged view of the negative pressure cleaning mechanism located at the top of the filter cartridge in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0016] Reference Figure 1-3 A specific embodiment of the present invention includes a filter cartridge 1, the side walls of the filter cartridge 1 are respectively provided with a liquid inlet pipe 2 and a liquid outlet pipe 3, a filter screen 4 is movably provided in the filter cartridge 1, a sealing ring 5 is fixed on the outside of the filter screen 4, the sealing ring 5 is in sliding contact with the inner wall of the filter cartridge 1, a sleeve 6 is fixed at the center of the filter screen 4, a hydraulic cylinder 7 is provided on the top of the filter cartridge 1, a rotating motor 8 is provided on the piston end of the hydraulic cylinder 7, an impeller 10 is respectively provided on the outside of both ends of the sleeve 6 through a bearing 9, the output end of the rotating motor 8 is connected to the bearing 9, the impeller 10 is in sliding contact with the surface of the filter screen 4, and a negative pressure cleaning mechanism 11 matching the impeller 10 is respectively provided on the top and bottom of the filter cartridge 1.

[0017] When in use, the pulp to be filtered is injected into the filter cartridge 1 through the liquid inlet pipe 2, and then the hydraulic cylinder 7 is started to drive the filter screen 4 to move to the other end (before use, the filter screen 4 is at the top or bottom of the filter cartridge 1). At the same time, the rotating motor 8 is started to drive the impeller 10 to rotate to collect impurities on the surface of the filter screen 4. When the filter screen 4 moves to the other end, the filtering process is completed, the filtered pulp is discharged through the liquid outlet pipe 3, and then the pulp to be filtered is injected into the filter cartridge 1 again through the liquid inlet pipe 2. In this process, the negative pressure cleaning mechanism 11 is started to absorb the impurities cleaned by the impeller 10. The absorption process and the liquid discharge and injection operation are carried out simultaneously, and do not take up separate time. The entire filtering process can be carried out continuously, realizing continuous operation without stopping for a long time.

[0018] The impeller 10 includes a base 12 sleeved on the outer side of the bearing 9, a plurality of blades 13 are fixed on the outer side of the base 12, a sloped portion 14 is provided on the side of the bottom edge of the blade 13 facing away from the rotation of the impeller 10, a groove 15 is provided on the side of the blade 13 facing the rotation of the impeller 10, a plurality of notches 16 are provided on the bottom edge of the blade 13, a guide plate 17 is horizontally provided on the sloped portion 14, a through hole 18 corresponding to the notch 16 is provided on the guide plate 17, the axis of the through hole 18 is coplanar with the center line of the notch 16, a partition 19 is fixed between adjacent through holes 18, a horizontal through groove 20 is provided on the top of the partition 19, and the height of the through groove 20 gradually increases from the position close to the through hole 18 to the position away from the through hole 18. The ratio of the diameter of the through hole 18 to the width of the notch 16 is 1:6, and the ratio of the length of the partition 19 to the spacing between adjacent partitions 19 is 2:3. The impurities cleaned by the blades 13 gradually gather in the grooves 15, and the slurry forms turbulence between the inclined portion 14 and the filter screen 4 under the guiding action of the notch 16 and the guide plate 17, flushing the impurities remaining on the filter screen to prevent excessive adhesion of impurities on the filter screen 4, thereby improving the cleaning efficiency.

[0019] The negative pressure cleaning mechanism 11 includes an outer cover 21, which is connected to a negative pressure suction pipe 22. A first receiving groove 23 for receiving the base 12 and a second receiving groove 24 for receiving the blade 13 are provided in the outer cover 21, and an air jet hole 25 is provided inside the first receiving groove 23 and the second receiving groove 24. A negative pressure suction pipe 22 is connected to the outside of each second receiving groove 24, and the air jet hole 25 in the first receiving groove 23 is arranged horizontally, and the air jet hole 25 in the first receiving groove 23 faces the axis of the base 12, and the air jet hole 25 in the second receiving groove 24 faces the groove 15. The height of the inner cavity of the negative pressure suction pipe 22 gradually increases from the inlet to the inside, and the top wall of the inner cavity of the negative pressure suction pipe 22 is provided with an arc surface 26. The negative pressure cleaning mechanism 11 uses the negative pressure suction pipe 22 to absorb the collected impurities. By optimizing the shape of the internal air flow channel of the negative pressure suction pipe 22, the resistance of the impurities in the negative pressure suction pipe 22 can be reduced. The air jet hole 25 is used to assist the negative pressure suction pipe 22 in cleaning the impurities.

[0020] The blades 13 designed in the present invention can not only efficiently clean the impurities on the surface of the filter 4. Since the present invention uses a negative pressure airflow suction method to absorb impurities, and uses airflow to purge the impurities in the groove 15 in order to improve the suction efficiency, the airflow is easy to generate turbulence after reaching the groove 15, resulting in impurities not being easily absorbed by the negative pressure suction tube 22. The blades 13 of the present invention use the notch 16 at the bottom to guide the airflow, thereby reducing the turbulence formed by the airflow at the groove. At the same time, since the second receiving grooves 24 are relatively isolated from each other, the airflow will not generate too much turbulence on the side of the inclined portion 14, nor will it have a significant impact on the adjacent blades 13.

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pulp filtering device, characterized in that: The filter cartridge (1) comprises a filter cartridge (1), wherein the side walls of the filter cartridge (1) are respectively provided with a liquid inlet pipe (2) and a liquid outlet pipe (3), a filter screen (4) is movably provided inside the filter cartridge (1), a sealing ring (5) is fixed outside the filter screen (4), the sealing ring (5) is in sliding contact with the inner wall of the filter cartridge (1), a sleeve (6) is fixed at the center of the filter screen (4), a hydraulic cylinder (7) is provided at the top of the filter cartridge (1), a rotating motor (8) is provided at the piston end of the hydraulic cylinder (7), an impeller (10) is provided at the outer sides of both ends of the sleeve (6) via bearings (9), the output end of the rotating motor (8) is connected to the bearings (9), the impeller (10) is in sliding contact with the surface of the filter screen (4), and negative pressure cleaning mechanisms (11) matching the impeller (10) are respectively provided at the top and bottom of the filter cartridge (1); The impeller (10) comprises a base (12) sleeved on the outer side of the bearing (9), a plurality of blades (13) are fixed on the outer side of the base (12), a sloped portion (14) is provided on the side of the bottom edge of the blade (13) facing away from the rotation of the impeller (10), a groove (15) is provided on the side of the blade (13) facing the rotation of the impeller (10), a plurality of notches (16) are provided on the bottom edge of the blade (13), a guide plate (17) is horizontally provided on the sloped portion (14), a through hole (18) corresponding to the notch (16) is provided on the guide plate (17), the axis of the through hole (18) is coplanar with the center line of the notch (16), a partition plate (19) is fixed between adjacent through holes (18), a horizontal through groove (20) is provided on the top of the partition plate (19), and the height of the through groove (20) gradually increases from a position close to the through hole (18) to a position away from the through hole (18); The negative pressure cleaning mechanism (11) comprises an outer cover (21), the outer cover (21) is connected to a negative pressure suction pipe (22), a first receiving groove (23) for receiving a base (12) and a second receiving groove (24) for receiving a blade (13) are arranged in the outer cover (21), and jet holes (25) are arranged inside the first receiving groove (23) and the second receiving groove (24); the outer side of each second receiving groove (24) is connected to a negative pressure suction pipe (22), the jet holes (25) in the first receiving groove (23) are arranged horizontally, the jet holes (25) in the first receiving groove (23) face the axis of the base (12), and the jet holes (25) in the second receiving groove (24) face the groove (15).

2. The pulp filtering device according to claim 1, characterized in that: The ratio of the diameter of the through hole (18) to the width of the notch (16) is 1:6, and the ratio of the length of the partition (19) to the spacing between adjacent partitions (19) is 2:

3.

3. The pulp filtering device according to claim 2, characterized in that: The height of the inner cavity of the negative pressure suction tube (22) gradually increases from the inlet toward the inside, and the top wall of the inner cavity of the negative pressure suction tube (22) is provided with a curved surface portion (26).

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