Anti-winding stirrer for drum pulper

Abstract

The utility model relates to the technical field of pulping and papermaking, in particular to an anti-winding stirrer for a drum pulper, which comprises a stirring shaft and a blade component arranged at the tail end of the stirring shaft. The outer side of the stirring shaft is sleeved with a slurry pipe, and the lower end of the slurry pipe extends to the position above the blade assembly; the blade assembly is composed of a plurality of spiral stirring blades, and the upper ends of the stirring blades extend upwards in an inclined mode and wrap the outer side of the lower end of the slurry pipe. Impurity clusters are blocked on the outer side by arranging the slurry pipe, and the problem that the impurity clusters are wound on the shaft body along with rotation of the stirring shaft is effectively solved; the circular-truncated-cone-shaped structure of the slurry pipe is matched with the coating film, so that impurity clusters wound on the outer side of the slurry pipe can fall off easily; the inclined extension device at the upper end of the stirring blade can cut off and disperse impurity clusters which fall off downwards and are wound on the slurry pipe; the overall design is reasonable, the structure is compact, and practicability is high.

Description

Technical Field

[0001] This utility model relates to the field of pulp and paper technology, specifically to an anti-winding agitator for a rotary drum pulper. Background Technology

[0002] Rotary drum pulpers, as typical continuous pulpers, are widely used in automated pulping. Rotary drum pulping includes a disintegration section and a pulping section. The drum rotates slowly (usually 10-20 rpm), and waste paper tumbles and falls continuously under the influence of gravity, friction, and the lifting action of the spiral baffles, achieving disintegration through inter-fiber friction and mechanical impact. After disintegration, the waste paper mixed with liquid is discharged into the trough for pulping, which requires agitation. In actual pulping, a top plate is fitted to the upper end of the trough, and the agitator motor is located on the upper part of the top plate. The agitator shaft, connected to the output end of the agitator, extends through the top plate into the trough, where it agitates using blades. However, during agitation inside the trough, impurities such as thread ends, plastic strips, and braided ropes in the waste paper become entangled on the rotating agitator shaft, forming impurity clumps. These clumps increase the rotational load on the agitator, causing the motor power consumption to rise continuously, which not only shortens the motor's lifespan but also hinders production management.

[0003] A published Chinese patent, CN219002659U, discloses an anti-winding impeller for a pulp mixer. It includes an impeller assembly, a blade assembly, and an anti-winding component. The impeller assembly includes an impeller base and a stirring shaft. First, second, third, fourth, fifth, and sixth blades are evenly distributed and extend outwards along the outer circumferential wall of the impeller base. A first protrusion is connected to the first blade at an inclined angle, and the cross-sections of the first, second, and third protrusions are all triangular. However, in this patent, the stirring shaft still directly contacts the fibrous material in the pulp; the first, second, and third protrusions merely guide and push the fibrous material through the pulp, resulting in a poor anti-winding effect. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an anti-winding agitator for a rotary drum pulper. By sleeved a pulp tube outside the agitator shaft, the pulp tube is in a non-rotating state during the agitation process, while the agitator shaft rotates inside the pulp tube. The pulp tube can block impurities on the outside, effectively preventing impurity clumps from contacting the agitator shaft and winding around the shaft body as the agitator shaft rotates, thus improving the anti-winding effect during the agitation process. This solves the problem that the anti-winding effect of the prior art, which uses the method of guiding and pushing fibrous materials in the pulp, is not good.

[0005] To achieve the above and other related objectives, this utility model provides an anti-winding agitator for a rotary drum pulper, comprising an agitator shaft and a blade assembly with the agitator shaft end;

[0006] A slurry pipe is sleeved on the outside of the stirring shaft, and the lower end of the slurry pipe extends above the blade assembly.

[0007] The blade assembly consists of multiple spiral stirring blades, with the upper end of the stirring blades extending upwards and wrapping around the lower end of the slurry tube.

[0008] In one embodiment of this utility model, the slurry pipe is configured as a frustum-shaped structure that is wider at the top and narrower at the bottom.

[0009] In one embodiment of the present invention, the outer surface of the slurry tube is coated with a layer of graphite emulsion lubricating film, and the coating thickness of the graphite emulsion lubricating film is 30-50 mm.

[0010] In one embodiment of the present invention, a rotating connector is provided on the inner side of the lower end of the slurry pipe, and the stirring shaft is rotatably connected to the lower end of the slurry pipe through the rotating connector.

[0011] In one embodiment of the present invention, the upper end of the blade assembly is provided with a circumferentially closed welding member, and the upper ends of multiple stirring blades are simultaneously welded to the welding member.

[0012] In one embodiment of the present invention, there is a gap between the inner side of the upper end of the stirring blade and the slurry tube.

[0013] As described above, the anti-winding agitator for the rotary drum pulper of this invention has the following beneficial effects:

[0014] 1. This invention creates a slurry tube that is sleeved outside the agitator shaft. During the agitation process, the slurry tube is in a non-rotating state, while the agitator shaft rotates inside the slurry tube. The slurry tube can block impurities on the outside, effectively preventing impurity clumps from contacting the agitator shaft and wrapping around the shaft as it rotates. This improves the anti-winding effect during the agitation process, thereby avoiding the high load problem caused by impurity clumps wrapping around the agitator shaft, extending the service life of the motor, and improving production efficiency.

[0015] 2. Since the impurity clumps are blocked by the slurry tube, some of the impurity clumps will wrap around the outside of the slurry tube due to the inertia of stirring. This application sets the slurry tube into a frustum-shaped structure that is wider at the top and narrower at the bottom and coats it with a film. The frustum-shaped slurry tube can achieve a self-cleaning effect by allowing the impurity clumps to wrap around the slurry tube and accumulate to a certain amount, and then slide off downwards under the influence of its own weight and guided by the frustum-shaped structure.

[0016] 3. By extending the upper end of the stirring blade upwards and wrapping it around the lower end of the slurry pipe, the stirring blade can cut off and disperse the impurity clumps wrapped around the outside of the slurry pipe and sliding down during normal rotation and stirring, further improving the self-cleaning effect and stirring effect of the slurry pipe.

[0017] 4. By setting a rotating connector, the rotating connector can provide rotational support for the stirring shaft while sealing the lower end of the slurry pipe, thereby improving the stirring stability of the agitator.

[0018] 5. By setting up welding parts, the welding parts can fix the multiple stirring blades that make up the blade assembly without affecting the normal rotation and stirring of the blade assembly, effectively improving the reliability of cutting off and dispersing impurity clumps at the upper end of the stirring blades, and reducing the possibility of the upper end of the stirring blades being bent and damaged.

[0019] 6. This application uses a slurry tube to block impurity clumps on the outside, effectively solving the problem of impurity clumps getting tangled on the shaft as the stirring shaft rotates; the frustum-shaped structure of the slurry tube, combined with the coating, facilitates the shedding of impurity clumps tangled on the outside of the slurry tube; the inclined extension at the upper end of the stirring blade can cut off and disperse impurity clumps that are tangled on the slurry tube and fall downwards; the overall design is reasonable, the structure is compact, and the practicality is high. Attached Figure Description

[0020] Figure 1 The diagram shown is a three-dimensional structural schematic of the anti-winding agitator for a rotary drum pulper disclosed in this utility model.

[0021] Figure 2 The image shown is a front view of the anti-winding agitator for a rotary drum pulper disclosed in this utility model.

[0022] Figure 3 Displayed as Figure 2 A schematic diagram of the cross-sectional structure along the middle AA.

[0023] Component designation explanation

[0024] 1. Stirring shaft; 2. Blade assembly; 21. Stirring blade; 3. Pulley pipe; 4. Graphite emulsion lubricating film; 5. Rotary connecting part; 6. Welded part. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0026] Please see Figures 1 to 3It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should fall within the scope of the disclosed technical content. Furthermore, terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0027] Please see Figures 1-3 This invention provides an anti-winding agitator for a rotary drum pulper, comprising an agitator shaft 1 and a blade assembly 2 with the end of the agitator shaft 1; a pulp pipe 3 is sleeved on the outside of the agitator shaft, with the lower end of the pulp pipe 3 extending above the blade assembly 2; in actual use, the upper end of the pulp pipe 3 is mounted on a top plate. This invention, by sleeved a section of pulp pipe 3 outside the shaft of the agitator, ensures that the pulp pipe 3 is in a non-rotating state during agitation, while the agitator shaft 1 rotates inside the pulp pipe 3. The pulp pipe 3 effectively blocks impurities from contacting the agitator shaft 1 and preventing impurity clumps from winding around the shaft as the agitator shaft 1 rotates, thus improving the anti-winding effect during agitation. This, in turn, avoids the high load problem caused by impurity clumps winding around the shaft of the agitator, extends the service life of the motor, and helps improve production efficiency.

[0028] The blade assembly 2 is composed of multiple spiral stirring blades 21. The upper end of the stirring blade 21 extends upward and wraps around the lower outer side of the slurry pipe 3. During normal rotation and stirring, the stirring blade 21 can also cut off and disperse the impurity clumps wrapped around the outside of the slurry pipe 3 and slide down through its upper end, further improving the self-cleaning effect and stirring effect of the slurry pipe 3. There is a gap between the inner side of the upper end of the stirring blade 21 and the slurry pipe 3. This gap can ensure that the rotation of the stirring blade 21 and the slurry pipe 3 will not interfere with each other.

[0029] The slurry tube 3 is configured as a frustum-shaped structure that is wider at the top and narrower at the bottom. Since the impurity clumps are blocked by the slurry tube 3, some of the impurity clumps will wrap around the outside of the slurry tube due to the inertia of stirring. This application achieves a self-cleaning effect on the slurry tube 3 by configuring the slurry tube 3 as a frustum-shaped structure. After the impurity clumps wrap around the slurry tube 3 and accumulate to a certain amount, they will slide downwards and fall off under the influence of gravity and guided by the frustum-shaped structure. The outer surface of the slurry tube 3 is coated with a layer of graphite emulsion lubricating film 4, and the coating thickness of the graphite emulsion lubricating film 4 is 30-50 mm. The coating can increase the smoothness of the slurry tube surface, which is conducive to the shedding of impurity clumps.

[0030] The lower end of the slurry pipe 3 is provided with a rotating connector 5. The stirring shaft 1 is rotatably connected to the lower end of the slurry pipe 3 through the rotating connector 5. The rotating connector 5 can provide rotational support for the stirring shaft 1 while sealing the lower end of the slurry pipe 3, thereby improving the stirring stability of the stirrer.

[0031] The upper end of the blade assembly 2 is provided with a circumferentially closed welding member 6, and the upper ends of multiple stirring blades 21 are simultaneously welded to the welding member 6. The welding member 6 can fix the multiple stirring blades 21 constituting the blade assembly 2 without affecting the normal rotation and stirring of the blade assembly 2, effectively improving the reliability of cutting off and dispersing impurity clumps at the upper end of the stirring blades 21, and reducing the possibility of the upper end of the stirring blades 21 being bent and damaged.

[0032] In summary, this application effectively solves the problem of impurity clumps becoming entangled on the shaft of the stirring shaft 1 as it rotates by setting up the slurry tube 3 to block the impurity clumps on the outside. The frustum-shaped structure of the slurry tube 3, combined with the coating, facilitates the shedding of impurity clumps entangled on the outside of the slurry tube 3. The inclined extension at the upper end of the stirring blade 21 can cut off and disperse impurity clumps that fall downwards from the slurry tube 3. The overall design is reasonable, compact, and highly practical. Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0033] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An anti-winding agitator for a rotary drum pulper, comprising an agitator shaft (1) and a blade assembly (2) having the end of the agitator shaft (1); Its features are: The outside of the stirring shaft is fitted with a slurry pipe (3), and the lower end of the slurry pipe (3) extends to the top of the blade assembly (2). The blade assembly (2) consists of multiple spiral stirring blades (21), with the upper end of the stirring blades (21) extending upwards and wrapping around the lower end of the slurry pipe (3).

2. The anti-winding agitator for a rotary drum pulper according to claim 1, characterized in that: The slurry pipe (3) is configured as a frustum-shaped structure that is wider at the top and narrower at the bottom.

3. The anti-winding agitator for a rotary drum pulper according to claim 2, characterized in that: The outer surface of the slurry tube (3) is coated with a layer of graphite emulsion lubricating film (4), and the coating thickness of the graphite emulsion lubricating film (4) is 30-50 mm.

4. The anti-winding agitator for a rotary drum pulper according to claim 2, characterized in that: The lower end of the slurry pipe (3) is provided with a rotating connector (5), and the stirring shaft (1) is rotatably connected to the lower end of the slurry pipe (3) through the rotating connector (5).

5. The anti-winding agitator for a rotary drum pulper according to claim 1, characterized in that: The upper end of the blade assembly (2) is provided with a circumferentially closed weldment (6), and the upper ends of multiple stirring blades (21) are simultaneously welded to the weldment (6).

6. The anti-winding agitator for a rotary drum pulper according to claim 1, characterized in that: There is a gap between the inner side of the upper end of the stirring blade (21) and the slurry pipe (3).

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