A screening device for screening pulp slurry

Abstract

This utility model discloses a screening device for screening pulp, including a screening barrel. A screening screen for screening the pulp is installed in the middle of the screening barrel. A cleaning component for cleaning impurities on the surface of the screening screen is installed on the upper part of the screening screen. The cleaning component includes a stepper motor mounted on the upper part of the screening barrel. A rotating shaft is installed at the output end of the stepper motor to drive several sets of brush blocks to rotate. The output ends of the brush blocks are all attached to the upper surface of the screening screen. An air supply pipe for conveying airflow is installed on the upper part of the screening screen. Several nozzles for spraying airflow onto the surface of the screening screen are installed at the output end of the air supply pipe. Through the coordinated operation of all parts of the cleaning component, impurities trapped on the surface of the screening screen can be quickly cleaned, effectively preventing screen clogging. Compared with manual cleaning of the screening screen, this method has higher cleaning efficiency and can ensure the working efficiency of the entire screening device.

Description

Technical Field

[0001] This utility model relates to the technical field of pulp screening devices, specifically a screening device for screening pulp. Background Technology

[0002] Pulp screening equipment is used in the papermaking industry to screen and classify pulp, separating fibers and impurities of different sizes. It mainly consists of screen plates or screens, vibration systems, material distribution systems, cleaning systems, and control units. It uses gravity, vibration, or centrifugation to allow qualified fibers in the pulp to pass through the screen holes, while impurities are retained. Common types include self-washing vibrating frame screens with self-cleaning functions for coarse pulp screening, and energy-saving and efficient medium-consistency screens suitable for medium-consistency pulp screening.

[0003] Existing pulp screening equipment struggles to quickly remove residual impurities from the screen. The long-term accumulation of these impurities leads to screen blockage, affecting subsequent screening efficiency. Manual cleaning requires machine shutdown, which ultimately reduces the overall screening efficiency of the equipment.

[0004] According to the authorization announcement number CN 221545124 U, a waste paper pulp screening device is disclosed, including a shell, a fixing block and a fixing frame are fixedly installed on the top of the shell, and a drive motor is fixedly installed on the fixing frame. A first feed hole is opened on the top of the shell, and a stirring mechanism is fixedly installed on the inner wall of the top of the shell. A screening box is slidably installed on the inner wall of the shell, and two sliding plates and two screening plates are slidably installed on the inner wall of the screening box. The two sides of the two screening plates are respectively fixedly installed on the two sliding plates, and multiple return springs are fixedly installed on one of the sliding plates.

[0005] The aforementioned patents confirm that existing pulp screening devices struggle to quickly remove residual impurities from the screen, affecting subsequent screening results. Manual cleaning requires machine downtime, leading to a decrease in screening efficiency over time. Therefore, a new pulp screening device is needed. Utility Model Content

[0006] The purpose of this invention is to provide a screening device for screening pulp, which uses a rotating brush block in conjunction with a nozzle that sprays air to clean the surface of the screening screen, thereby solving the technical problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A screening device for screening pulp includes a screening barrel, a screening screen for screening the pulp is installed in the middle of the screening barrel, and a cleaning component for cleaning impurities on the surface of the screening screen is installed on the upper part of the screening screen.

[0009] The cleaning assembly includes a stepper motor mounted on the upper part of the screening barrel. The output end of the stepper motor is equipped with a rotating shaft that drives several sets of brush blocks to rotate. The output ends of the several sets of brush blocks are all attached to the upper surface of the screening screen. An air supply pipe for conveying airflow is installed on the upper part of the screening screen. Several sets of nozzles for spraying airflow onto the surface of the screening screen are installed at the output end of the air supply pipe.

[0010] Preferably, the top of the screening barrel is equipped with a closed cover, and an air pump that delivers airflow into the air supply pipe is installed on the upper surface of the closed cover. The stepper motor is installed on the upper part of the closed cover.

[0011] Preferably, a collection block for collecting impurities is installed through the side wall of the screening barrel corresponding to the screening mesh, a discharge pipe for conveying impurities is installed on the side of the collection block, and a first valve for controlling the discharge of impurities is installed in the middle of the discharge pipe.

[0012] Preferably, the outlet end of the discharge pipe is equipped with a collection box for storing impurities, and the collection box is located on the side of the screening barrel.

[0013] Preferably, a support frame is installed inside the screening barrel, the screening screen is installed in the middle of the support frame, and a vibration damping ring is installed between the screening screen and the support frame.

[0014] Preferably, a vibration motor that drives the screening screen to vibrate is installed on the side wall of the screening barrel, and a vibration damping buffer pad is installed between the vibration motor and the screening barrel.

[0015] Preferably, a number of stirring blades for stirring pulp are installed in the middle of the rotating shaft, and a guide block for guiding the flow of pulp is installed inside the screening tank. The guide block is located between the stirring blades and the air supply pipe.

[0016] Preferably, a feed pipe is installed through the middle of the closed cover, and a discharge pipe for discharging filtered pulp is installed through the bottom of the screening barrel. A second valve for controlling the flow of pulp is installed in the middle of the discharge pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] When cleaning the screen surface is required, the cleaning assembly is activated. A stepper motor drives the rotating shaft, which in turn drives the brush blocks to rotate, scrubbing the screen surface. Simultaneously, an air supply pipe delivers external airflow to the nozzles, which spray the airflow onto the screen. This airflow, working in conjunction with the rotating brush blocks, quickly removes impurities from the screen surface. Through the coordinated operation of all parts of the cleaning assembly, impurities trapped on the screen surface can be rapidly removed, effectively preventing screen clogging. Compared to manual cleaning of the screen, this method is more efficient and ensures the overall working efficiency of the screening device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the screening barrel of this utility model;

[0021] Figure 3 This is a schematic diagram of the nozzle mounting structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the installation structure of the screening mesh of this utility model;

[0023] Figure 5 This is a schematic diagram of the installation structure of the vibration damping ring of this utility model.

[0024] In the diagram: 1. Screening tank; 101. Sealing cover; 2. Support frame; 3. Screening mesh; 4. Vibration damping ring; 5. Cleaning assembly; 51. Stepper motor; 52. Rotating shaft; 53. Brush block; 54. Air pump; 55. Air supply pipe; 56. Nozzle; 6. Collection block; 7. Waste discharge pipe; 8. First valve; 9. Collection box; 10. Vibration motor; 11. Buffer pad; 12. Stirring blade; 13. Guide block; 14. Feed pipe; 15. Discharge pipe; 16. Second valve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides: a screening device for screening pulp, such as... Figures 1-5 As shown, the system includes a screening tank 1, with a screening screen 3 installed in the middle for screening pulp, and a cleaning assembly 5 installed on the upper part of the screening screen 3 to remove impurities from its surface. The screening tank 1 provides a closed space for pulp screening, and the screening screen 3 inside is horizontally installed in the middle, separating coarse and fine particles in the pulp through the mesh size. The cleaning assembly 5 is used to remove impurities trapped on the surface of the screening screen 3, preventing screen clogging and ensuring screening efficiency.

[0027] The cleaning component 5 includes a stepper motor 51 mounted on the upper part of the screening drum 1. A rotating shaft 52 is installed at the output end of the stepper motor 51, driving several sets of brush blocks 53 to rotate. The output ends of the brush blocks 53 are all attached to the upper surface of the screening screen 3. An air supply pipe 55 is installed on the upper part of the screening screen 3, and several nozzles 56 are installed at the output end of the air supply pipe 55 to spray air onto the surface of the screening screen 3. The stepper motor 51 is mounted on the upper part of the closed cover 101 and drives the rotating shaft 52 to rotate, providing rotational power to the brush blocks 53. The rotating shaft 52 is installed through the middle of the closed cover 101 to transmit the rotational motion of the stepper motor 51 to the brush blocks 53, mechanically brushing the screen surface to remove trapped impurities. The brush blocks 53 are made of corrosion-resistant nylon bristles, suitable for acidic pulp environments. The air supply pipe 55 is installed on the upper part of the screening screen 3 and connected to an air pump 54 to deliver compressed air to the nozzles 56. Nozzles 56 are evenly distributed along the air supply pipe 55, directing airflow towards the surface of the screening screen 3. The airflow impacts the auxiliary brush block 53, removing impurities. After the stepper motor 51 starts, the rotating shaft 52 drives the brush block 53 to rotate, causing the bristles to rub against the surface of the screening screen 3, loosening the trapped impurities. Simultaneously, the air pump 54 compresses air and delivers it to the nozzles 56 through the air supply pipe 55. The high-speed airflow is then sprayed onto the surface of the screening screen 3, blowing the loosened impurities towards the collection block 6, achieving efficient cleaning.

[0028] The stepper motor 51 can be a motor with a rated torque of 1.5 N·m, a speed of 100 rpm, and an operating voltage of 24V. This model's torque is sufficient to drive the rotating shaft 52 and the brush block 53. The 100 rpm speed allows the brush block to clean the surface of the screening screen 3 at a moderate speed, avoiding excessively high speeds that would cause premature brush wear or excessively low speeds that would affect cleaning efficiency. The 24V voltage is compatible with commonly used industrial power supplies, ensuring stable equipment operation.

[0029] Preferably, a sealing cover 101 is installed on the top of the screening barrel 1. An air pump 54, which delivers airflow to the air delivery pipe 55, is installed on the upper surface of the sealing cover 101. A stepper motor 51 is installed on the upper part of the sealing cover 101. The sealing cover 101 is installed on the top of the screening barrel 1 to seal the screening space and prevent pulp from overflowing to the outside before screening. The air pump 54 provides compressed airflow to the air delivery pipe 55 to ensure the jet pressure of the nozzle 56. The stepper motor 51 is fixed to the upper part of the sealing cover 101 and connected to the rotating shaft 52 to achieve power transmission while ensuring sealing.

[0030] The air pump 54 can be a pump with a displacement of 100L / min, a rated pressure of 0.5MPa, and a power of 0.75kW. The displacement of 100L / min and the pressure of 0.5MPa can provide a sufficiently powerful airflow to the nozzle 56 through the air supply pipe 55, ensuring that the airflow can effectively blow off impurities from the surface of the screening screen; the power of 0.75kW balances energy consumption and air source stability, making it suitable for continuous operation scenarios.

[0031] Preferably, a collection block 6 for collecting impurities is installed through the side wall of the screening barrel 1, corresponding to the screening mesh 3. A discharge pipe 7 for conveying impurities is installed on the side of the collection block 6, and a first valve 8 for controlling the discharge of impurities is installed in the middle of the discharge pipe 7. The collection block 6 is installed in the position corresponding to the screening mesh 3, and its internal channel communicates with the surface of the screening mesh 3 to collect the cleaned impurities. The discharge pipe 7 is connected to the side of the collection block 6 and conveys the impurities to the external collection box 9. The first valve 8 is installed in the middle of the discharge pipe 7 and controls the discharge of impurities by opening and closing it. After the brush block 53 and the nozzle 56 clean the impurities to the collection block 6, the first valve 8 is opened, and the impurities fall into the collection box 9 through the discharge pipe 7 under the action of airflow. When the first valve 8 is closed, the screening barrel 1 remains sealed and the screening operation continues.

[0032] Furthermore, a collection box 9 for storing impurities is installed at the output end of the discharge pipe 7, and the collection box 9 is located on the side of the screening barrel 1. The collection box 9 is located on the side of the screening barrel 1 to facilitate the collection and cleaning of impurities. When the first valve 8 is opened, the impurities cleaned from the surface of the screening screen 3 enter the discharge pipe 7 through the collection block 6 and are discharged into the collection box 9 under the action of airflow; after the first valve 8 is closed, the collection box 9 can temporarily store impurities to prevent impurities from accumulating in the pipe.

[0033] Furthermore, a support frame 2 is installed inside the screening barrel 1, and the screening screen 3 is installed in the middle of the support frame 2. A vibration damping ring 4 is installed between the screening screen 3 and the support frame 2. The support frame 2 supports the screening screen 3, ensuring that the screening screen 3 remains stable during operation. The vibration damping ring 4, installed between the screening screen 3 and the support frame 2, absorbs the energy generated by the vibration of the screening screen 3, reduces the transmission of vibration to the support frame 2 and the screening barrel 1, and ensures the stability of the entire device.

[0034] It is worth noting that a vibrating motor 10, which drives the screening screen 3 to vibrate, is installed on the side wall of the screening drum 1. A vibration damping buffer pad 11 is installed between the vibrating motor 10 and the screening drum 1. The vibrating motor 10 is used to drive the screening screen 3 to vibrate, thereby improving the screening efficiency of the pulp. The buffer pad 11, installed between the vibrating motor 10 and the screening drum 1, can reduce the transmission of vibration from the vibrating motor 10 to the screening drum 1, reduce noise, and protect the entire equipment structure.

[0035] The vibrating motor 10 is a motor with a rated power of 0.75kW, a vibration frequency of 50Hz, and an excitation force of 10kN. The 0.75kW power drives the screening screen 3 to generate stable vibration. The 50Hz frequency is consistent with the industrial power grid frequency, which can reduce the risk of resonance. The 10kN excitation force enables the screening screen to obtain a suitable amplitude, promotes the pulp to pass through the screen holes quickly, and avoids excessive vibration that could damage the equipment.

[0036] Specifically, several sets of stirring blades 12 for stirring the pulp are installed in the middle of the rotating shaft 52, and a guide block 13 for guiding the flow of pulp is installed inside the screening tank 1. The guide block 13 is located between the stirring blades 12 and the air supply pipe 55. The stirring blades 12 are installed in the middle of the rotating shaft 52 and stir the pulp as the shaft 52 rotates, promoting uniform flow of the pulp. The guide block 13 is installed inside the screening tank 1, located between the stirring blades 12 and the air supply pipe 55, and its curved structure is used to guide the pulp to the screening screen 3. When the stepper motor 51 drives the rotating shaft 52 to rotate, the stirring blades 12 stir the pulp. The pulp flows to the guide block 13 under the push of the stirring blades 12, and the curved surface of the guide block 13 guides the pulp evenly to the surface of the screening screen 3, so that the pulp passes through the screen holes more evenly and improves the screening quality.

[0037] More specifically, a feed pipe 14 is installed through the middle of the closed cover 101, and a discharge pipe 15 for discharging filtered pulp is installed through the bottom of the screening tank 1. A second valve 16 for controlling the flow of pulp is installed in the middle of the discharge pipe 15. The feed pipe 14 is used to introduce the pulp to be screened into the screening tank 1. The discharge pipe 15 is used to discharge the qualified pulp after filtration through the screening screen 3. The second valve 16 controls the discharge flow rate and stops the filtered pulp.

[0038] The first valve 8 and the second valve 16 can be valves with a nominal diameter of DN50 and a nominal pressure of 1.6MPa. The DN50 diameter matches the diameter of the impurity discharge pipe 7 and the discharge pipe 15, facilitating the smooth flow of impurities and pulp; the 1.6MPa pressure rating can withstand the airflow pressure and liquid pressure inside the screening tank 1.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screening device for screening pulp, characterized in that: Includes a screening barrel (1), a screening screen (3) for screening pulp is installed in the middle of the screening barrel (1), and a cleaning component (5) for cleaning impurities on the surface of the screening screen (3) is installed on the upper part of the screening screen (3). The cleaning component (5) includes a stepper motor (51) installed on the upper part of the screening barrel (1). The output end of the stepper motor (51) is equipped with a rotating shaft (52) that drives several sets of brush blocks (53) to rotate. The output ends of the several sets of brush blocks (53) are all attached to the upper surface of the screening screen (3). An air supply pipe (55) for conveying airflow is installed on the upper part of the screening screen (3). The output end of the air supply pipe (55) is equipped with several sets of nozzles (56) that spray airflow onto the surface of the screening screen (3).

2. The screening device for screening pulp as described in claim 1, characterized in that: The top of the screening barrel (1) is equipped with a sealing cover (101), and the upper surface of the sealing cover (101) is equipped with an air pump (54) that delivers airflow into the air supply pipe (55). The stepper motor (51) is installed on the upper part of the sealing cover (101).

3. The screening device for screening pulp as described in claim 2, characterized in that: The side wall of the screening barrel (1) is connected to the screening screen (3) and a collection block (6) for collecting impurities is installed through it. The side of the collection block (6) is equipped with a discharge pipe (7) for conveying impurities. The middle of the discharge pipe (7) is equipped with a first valve (8) for controlling the discharge of impurities.

4. The screening device for screening pulp as described in claim 3, characterized in that: The discharge pipe (7) is equipped with a collection box (9) for storing impurities at its output end, and the collection box (9) is located on the side of the screening barrel (1).

5. The screening device for screening pulp as described in claim 1, characterized in that: The screening barrel (1) is equipped with a support frame (2), the screening mesh (3) is installed in the middle of the support frame (2), and a vibration damping ring (4) is installed between the screening mesh (3) and the support frame (2).

6. The screening device for screening pulp as described in claim 1, characterized in that: The side wall of the screening barrel (1) is equipped with a vibration motor (10) that drives the screening screen (3) to vibrate, and a vibration damping buffer pad (11) is installed between the vibration motor (10) and the screening barrel (1).

7. The screening device for screening pulp according to claim 1, characterized in that: The rotating shaft (52) is equipped with several sets of stirring blades (12) for stirring the pulp. The screening tank (1) is equipped with a guide block (13) for guiding the flow of pulp. The guide block (13) is located between the stirring blades (12) and the air supply pipe (55).

8. The screening device for screening pulp according to claim 2, characterized in that: A feed pipe (14) is installed through the middle of the closed cover (101), and a discharge pipe (15) for discharging filtered pulp is installed through the bottom of the screening barrel (1). A second valve (16) for controlling the flow of pulp is installed in the middle of the discharge pipe (15).

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