Papermaking pulp screening device

Abstract

A papermaking pulp screening device relates to the technical field of screening devices and comprises a horizontally arranged barrel shell, a screening net barrel is coaxially and rotatably mounted in the barrel shell, a spiral conveying blade in frictional contact with the inner wall of the screening net barrel is fixedly arranged in the screening net barrel, the top of the barrel shell is fixedly connected with a mounting cavity shell communicated with an inner cavity of the barrel shell, and the top of the mounting cavity shell is fixedly connected with a cleaning cavity shell. A plurality of reverse cleaning nozzles facing the outer wall of the screening net barrel are fixedly connected to the lower end of the cleaning cavity shell in parallel, an electric three-way valve communicated with an inner cavity of the cleaning cavity shell is fixedly connected to the upper end of the cleaning cavity shell, and the other two ports of the electric three-way valve are connected with an air source and a liquid source respectively. According to the slurry screening device, the problems that in the prior art, after impurities in slurry are screened through a slurry screening device, shutdown is needed to guide out the impurities, so that the screening efficiency of the slurry is reduced, and it cannot be guaranteed that the slurry rapidly penetrates through a filtering structure in the screening process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of screening devices, in particular to a papermaking pulp screening device. Background Art

[0002] In the process of papermaking production, in order to improve product quality, the pulp for papermaking needs to be screened. However, in the prior art, after the screening device screens the pulp for papermaking, it is easy for the screen to be blocked and the slag discharge port to be blocked. When the screen is blocked or the slag discharge port is blocked, the screen needs to be disassembled for cleaning, which greatly reduces the production efficiency.

[0003] The prior art discloses a patent with announcement number CN210177269U, which includes a main body with a feed port on the top, a screening assembly installed inside the main body, and a discharge port at the bottom of the main body; the screening assembly consists of a screen, a vibrator and a plurality of vibration springs, has a simple structure, good screening effect and is easy to clean.

[0004] The existing devices including the above patents gradually exposed the shortcomings of the existing technology as they were used, mainly in the following aspects:

[0005] First, after the existing slurry screening device screens the impurities in the slurry, it is necessary to stop the machine to remove the impurities, which not only reduces the screening efficiency of the slurry, but also cannot ensure the efficiency of the slurry penetrating the filter structure during the screening process.

[0006] Second, as the slurry is used, the existing slurry screening device tends to adhere to the filter structure, requiring operators to regularly disassemble and clean it, which increases labor intensity.

[0007] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the defects in the prior art, the utility model provides a papermaking pulp screening device to solve the problem that the pulp screening device in the traditional technology needs to stop the machine to extract the impurities after screening the impurities in the pulp, which not only reduces the screening efficiency of the pulp, but also cannot ensure that the pulp can quickly penetrate the filter structure during the screening process.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] The papermaking pulp screening device comprises a horizontally arranged cylinder shell, a screening net cylinder is coaxially rotatably installed in the cylinder shell, and a spiral conveying blade in frictional contact with the inner wall of the screening net cylinder is fixedly arranged inside the screening net cylinder.

[0011] The top of the cylinder shell is fixedly connected to an installation cavity shell connected to its inner cavity, the top of the installation cavity shell is fixedly connected to a cleaning cavity shell, the lower end of the cleaning cavity shell is fixedly connected in parallel to a plurality of reverse cleaning nozzles facing the outer wall of the screening mesh cylinder, the upper end of the cleaning cavity shell is fixedly connected to an electric three-way valve connected to its inner cavity, and the other two ports of the electric three-way valve are respectively connected to a gas source and a liquid source.

[0012] As an optimized solution, the two ports of the cylinder shell are fixedly connected with an inlet end cover and an outlet end cover respectively, the inlet end cover and the outlet end cover are coaxially provided with mounting holes, an inlet swivel is rotatably mounted on the mounting hole on the inlet end cover, and an outlet swivel is rotatably mounted on the mounting hole on the outlet end cover, and the two ends of the screening mesh cylinder are fixedly connected with the inlet swivel and the outlet swivel respectively.

[0013] As an optimized solution, a gear ring is coaxially fixed to the outer end of the inlet swivel, a driving machine is fixed to the outer wall of the inlet end cover, and the output shaft of the driving machine is meshed with the gear ring through a gear.

[0014] As an optimized solution, a slurry entry guide cylinder is fixedly connected to the outer wall of the inlet end cover through a top connecting frame and a bottom connecting frame, and the outlet end of the slurry entry guide cylinder passes through the inlet swivel and extends into the screening mesh cylinder.

[0015] As an optimized solution, a rectangular mounting hole is axially opened on the top of the cylinder shell, and the mounting cavity shell is a rectangular shell matching the rectangular mounting hole. The lower end of the rectangular shell is opened and fixed in the rectangular mounting hole.

[0016] As an optimized solution, a cleaning plate is fixedly connected to the outer wall of the screening mesh cylinder and is in frictional contact with the inner wall of the cylinder shell.

[0017] As an optimized solution, the cylinder shell is coaxially fixed with a fixing ring at the outer end of the outlet swivel, and one end of the spiral conveying blade is fixed to the inner wall of the fixing ring.

[0018] As an optimized solution, a slag collecting shell is fixedly connected to the outer wall of the outlet end cover below the fixed ring, a liquid return channel connected to the inner cavity of the cylinder shell is opened on the side wall of the slag collecting shell, and a baffle covering the liquid return channel is fixedly connected to the inner wall of the slag collecting shell.

[0019] As an optimized solution, the inner bottom surface of the slag collecting shell is arranged to be inclined downward toward the liquid return channel.

[0020] As an optimized solution, the lower end of the cylinder shell is fixedly connected with a slurry discharge cylinder connected to its inner cavity.

[0021] As an optimized solution, an upper connecting frame and a lower connecting frame connected to the fixing ring are fixedly connected to the outer wall of the outlet end cover.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The slurry is introduced into the guide cylinder by the slurry. During the working process, the driver drives the screening cylinder to rotate slowly. The impurities in the slurry entering the screening cylinder will be blocked inside the screening cylinder, and the filtered slurry will pass through the screening cylinder and enter the bottom of the cylinder shell, and be discharged through the slurry discharge cylinder, so as to screen the impurities in the slurry.

[0024] The inside of the screening net cylinder is fixed with a spiral conveying blade in frictional contact with the inner wall thereof, so that during the rotation of the screening net cylinder, the screened impurities are moved toward the outlet end cover under the scraping and guiding action of the spiral conveying blade, and finally pass through the outlet end cover and fall into the slag collecting shell for collection, thereby realizing the simultaneous screening and exporting of impurities without stopping the machine, and because the impurities are cleaned and discharged in time, the efficiency of the slurry passing through the screening net cylinder can be guaranteed;

[0025] By arranging several reverse cleaning nozzles in parallel on the top of the cylinder shell, it is possible to switch the electric three-way valve to the state connected to the air source under normal screening working state, so that high-pressure air can be blown to the outer wall of the screening cylinder by the reverse cleaning nozzle, so as to blow off the fine particles mixed in the mesh of the screening cylinder, realize automatic cleaning, and ensure the screening efficiency of the slurry by the mesh at the bottom of the screening cylinder;

[0026] When the screening device needs to be thoroughly cleaned after working for a long time, the electric three-way valve is switched to the state connected to the water source, and high-pressure water is sprayed to the outer wall of the screening net cylinder using the reverse cleaning nozzle to backwash the screening net cylinder, thereby improving the cleaning efficiency of the screening net cylinder and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0028] Figure 1 It is a structural schematic diagram of the utility model.

[0029] In the figure: 1-cylinder shell, 2-screening mesh cylinder, 3-inlet end cover, 4-outlet end cover, 5-inlet swivel; 6-outlet swivel; 7-gear ring; 8-driving machine; 9-top connecting frame; 10-bottom connecting frame; 11-slurry entering guide cylinder; 12-cleaning plate; 13-slurry discharging cylinder; 14-spiral conveying blade; 15-fixing ring; 16-upper connecting frame; 17-lower connecting frame; 18-slag collecting shell; 19-liquid return channel; 20-blocking net; 21-mounting chamber shell; 22-cleaning chamber shell; 23-reverse cleaning nozzle; 24-electric three-way valve. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0031] like Figure 1 As shown, the papermaking pulp screening device comprises a horizontally arranged cylinder shell 1, a screening net cylinder 2 is coaxially mounted in the cylinder shell 1, and a spiral conveying blade 14 is fixed inside the screening net cylinder 2 and is in frictional contact with the inner wall thereof.

[0032] The top of the cylinder shell 1 is fixedly connected to an installation chamber shell 21 connected to its inner cavity, the top of the installation chamber shell 21 is fixedly connected to a cleaning chamber shell 22, the lower end of the cleaning chamber shell 22 is fixedly connected in parallel to a plurality of reverse cleaning nozzles 23 facing the outer wall of the screening mesh cylinder 2, the upper end of the cleaning chamber shell 22 is fixedly connected to an electric three-way valve 24 connected to its inner cavity, and the other two ports of the electric three-way valve 24 are respectively connected to a gas source and a liquid source.

[0033] The two ends of the cylinder shell 1 are fixedly connected with an inlet end cover 3 and an outlet end cover 4 respectively. The inlet end cover 3 and the outlet end cover 4 are coaxially provided with mounting holes. An inlet swivel 5 is rotatably mounted on the mounting hole on the inlet end cover 3, and an outlet swivel 6 is rotatably mounted on the mounting hole on the outlet end cover 4. The two ends of the screening mesh cylinder 2 are fixedly connected with the inlet swivel 5 and the outlet swivel 6 respectively.

[0034] A gear ring 7 is coaxially fixed to the outer end of the inlet swivel 5 , and a driving machine 8 is fixed to the outer wall of the inlet end cover 3 . The output shaft of the driving machine 8 is meshed with the gear ring 7 through a gear.

[0035] A slurry inlet guide cylinder 11 is fixedly connected to the outer wall of the inlet end cover 3 via a top connecting frame 9 and a bottom connecting frame 10 . The outlet end of the slurry inlet guide cylinder 11 passes through the inlet swivel 5 and extends into the screening mesh cylinder 2 .

[0036] A rectangular mounting hole is axially provided at the top of the cylinder shell 1. The mounting cavity shell 21 is a rectangular shell matching the rectangular mounting hole. The lower end of the rectangular shell is opened and fixed in the rectangular mounting hole.

[0037] A cleaning plate 12 is fixedly connected to the outer wall of the screening mesh cylinder 2 and is in frictional contact with the inner wall of the cylinder shell 1. The cleaning plate 12 is used to scrape off the slurry adhering to the inner wall of the cylinder shell 1, thereby ensuring the thoroughness of the slurry discharge.

[0038] A fixing ring 15 is coaxially fixedly connected to the cylinder shell 1 at the outer end of the outlet swivel 6 , and one end of the spiral conveying blade 14 is fixedly connected to the inner wall of the fixing ring 15 .

[0039] A slag collecting shell 18 is fixedly connected to the outer wall of the outlet end cover 4 below the fixed ring 15, a liquid return channel 19 connected to the inner cavity of the cylinder shell 1 is opened on the side wall of the slag collecting shell 18, and a retaining net 20 covering the liquid return channel 19 is fixedly connected to the inner wall of the slag collecting shell 18, so as to separate the liquid in the impurities and make the liquid in the impurities flow back to the inside of the cylinder shell 1 through the liquid return channel 19.

[0040] The inner bottom surface of the slag collecting shell 18 is arranged to be inclined downward toward the liquid return channel 19 .

[0041] The lower end of the cylinder shell 1 is fixedly connected with a slurry discharge cylinder 13 which is connected with the inner cavity thereof.

[0042] An upper connecting frame 16 and a lower connecting frame 17 connected to the fixing ring 15 are fixedly connected to the outer wall of the outlet end cover 4 .

[0043] The working principle of this device is:

[0044] The slurry is introduced into the guide cylinder 11 by the slurry. During the working process, the driving machine 8 drives the screening mesh cylinder 2 to rotate slowly. The impurities in the slurry entering the screening mesh cylinder 2 will be blocked inside the screening mesh cylinder 2, and the filtered slurry will pass through the screening mesh cylinder 2 and enter the bottom of the cylinder shell 1, and be discharged through the slurry discharge cylinder 13, so as to screen the impurities in the slurry.

[0045] The inside of the screening mesh drum 2 is fixed with a spiral conveying blade 14 in frictional contact with the inner wall thereof, so that during the rotation of the screening mesh drum 2, the screened impurities are moved toward the outlet end cover 4 under the scraping and guiding action of the spiral conveying blade 14, and finally pass through the outlet end cover 4 and fall into the slag collecting shell 18 for collection, thereby realizing the simultaneous screening and exporting of impurities without stopping the machine, and because the impurities are cleaned and discharged in time, the efficiency of the slurry passing through the screening mesh drum 2 can be guaranteed;

[0046] By arranging a plurality of reverse cleaning nozzles 23 in parallel at the top of the cylinder shell 1, it is realized that under the normal screening working state, the electric three-way valve 24 is switched to the state connected to the air source, and the high-pressure air is blown toward the outer wall of the screening net cylinder 2 by the reverse cleaning nozzle 23, so that the fine particles mixed in the mesh of the screening net cylinder 2 are blown off, and automatic cleaning is realized, thereby ensuring the screening efficiency of the slurry by the mesh of the screening net cylinder 2 rotating to the bottom;

[0047] When the screening device needs to be thoroughly cleaned after working for a long time, the electric three-way valve 24 is switched to a state connected to the water source, and high-pressure water is sprayed to the outer wall of the screening net cylinder 2 by the reverse cleaning nozzle 23 to achieve backwashing of the screening net cylinder 2, thereby improving the cleaning efficiency of the screening net cylinder 2 and reducing labor intensity. After cleaning, the electric three-way valve 24 can be switched to a state connected to the air source to achieve drying.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A papermaking pulp screening device, characterized in that: It comprises a horizontally arranged cylinder shell (1), a screening net cylinder (2) being coaxially rotatably mounted in the cylinder shell (1), and a spiral conveying blade (14) being fixedly arranged inside the screening net cylinder (2) in frictional contact with the inner wall thereof. The top of the cylinder shell (1) is fixedly connected to a mounting chamber shell (21) connected to its inner cavity, the top of the mounting chamber shell (21) is fixedly connected to a cleaning chamber shell (22), the lower end of the cleaning chamber shell (22) is fixedly connected in parallel to a plurality of reverse cleaning nozzles (23) directed toward the outer wall of the screening mesh cylinder (2), the upper end of the cleaning chamber shell (22) is fixedly connected to an electric three-way valve (24) connected to its inner cavity, and the other two ports of the electric three-way valve (24) are respectively connected to a gas source and a liquid source.

2. The papermaking pulp screening device according to claim 1, characterized in that: An inlet end cover (3) and an outlet end cover (4) are fixedly connected to the two ends of the cylinder shell (1) respectively. The inlet end cover (3) and the outlet end cover (4) are coaxially provided with mounting holes. An inlet swivel (5) is rotatably mounted on the mounting hole on the inlet end cover (3), and an outlet swivel (6) is rotatably mounted on the mounting hole on the outlet end cover (4). The two ends of the screening net cylinder (2) are fixedly connected to the inlet swivel (5) and the outlet swivel (6) respectively.

3. The papermaking pulp screening device according to claim 2, characterized in that: A gear ring (7) is coaxially fixedly connected to the outer end of the inlet swivel (5), a driving machine (8) is fixedly connected to the outer wall of the inlet end cover (3), and an output shaft of the driving machine (8) is meshed with the gear ring (7) via a gear.

4. The papermaking pulp screening device according to claim 3, characterized in that: A slurry inlet guide cylinder (11) is fixedly connected to the outer wall of the inlet end cover (3) via a top connecting frame (9) and a bottom connecting frame (10). The outlet end of the slurry inlet guide cylinder (11) passes through the inlet swivel (5) and extends into the screening mesh cylinder (2).

5. The papermaking pulp screening device according to claim 4, characterized in that: A rectangular mounting hole is provided at the top of the cylinder shell (1) along the axial direction, and the mounting cavity shell (21) is a rectangular shell body matching the rectangular mounting hole. The lower end of the rectangular shell body is open and fixedly connected to the rectangular mounting hole.

6. The papermaking pulp screening device according to claim 5, characterized in that: A cleaning plate (12) is fixedly connected to the outer wall of the screening mesh cylinder (2) and is in frictional contact with the inner wall of the cylinder shell (1).

7. The papermaking pulp screening device according to claim 6, characterized in that: A fixing ring (15) is coaxially fixedly connected to the cylinder shell (1) at the outer end of the outlet swivel ring (6), and one end of the spiral conveying blade (14) is fixedly connected to the inner wall of the fixing ring (15).

8. The papermaking pulp screening device according to claim 7, characterized in that: A slag collecting shell (18) is fixedly connected to the outer wall of the outlet end cover (4) below the fixing ring (15); a liquid return channel (19) communicating with the inner cavity of the cylinder shell (1) is provided on the side wall of the slag collecting shell (18); and a retaining net (20) covering the liquid return channel (19) is fixedly connected to the inner wall of the slag collecting shell (18).

9. The papermaking pulp screening device according to claim 8, characterized in that: The inner bottom surface of the slag collecting shell (18) is arranged to be inclined downward toward the liquid return channel (19).

10. The papermaking pulp screening device according to claim 9, characterized in that: The lower end of the cylinder shell (1) is fixedly connected to a slurry discharge cylinder (13) communicating with the inner cavity thereof.

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