A pulp mixing tank

Abstract

The utility model discloses a kind of pulp mixing tanks, which realizes the strong mixing of tank body central region and the automatic cleaning of tank wall pulp in the mixing stage, and the pulp solution is quickly pushed out by discharging blade in the discharging stage. Including including tank body, cover on the upper end of tank body, and the raw material outlet being located at the bottom of tank body, further including first stirring mechanism and second stirring mechanism: first stirring mechanism includes first drive source and the central stirring shaft driven by it and arranged along tank body axis;Second stirring mechanism includes second drive source and the sleeve shaft driven by it and sleeved outside the central stirring shaft, the lower part of the sleeve shaft is connected with cantilever stirring assembly extending along the radial direction of tank body;The lower end of the central stirring shaft passes through the cantilever stirring assembly, and is supported by a fixed support mounted in the bottom of tank body.

Description

Technical Field

[0001] This utility model belongs to the technical field of pulp preparation equipment. Specifically, it is a pulp mixing tank. Background Technology

[0002] In the papermaking industry, preparing pulp from plant fibers or recycled waste paper is a crucial initial step. This process requires thoroughly mixing the fiber raw materials with water and additives in a mixing tank to form a homogeneous suspension. The quality of this mixing directly determines the quality of the final product.

[0003] Traditional pulp mixing tanks typically employ a single mixing shaft structure, with the central shaft driving the blades for agitation. However, this single-shaft mixing method has significant limitations: First, the unidirectional mixing flow field makes it difficult to form effective axial circulation within the tank, resulting in uneven fiber dispersion and agglomeration. Second, the numerous dead zones in the mixing process cause slurry to adhere to the tank's side walls and bottom, forming scale, which not only reduces heat transfer efficiency and mixing uniformity but also wastes raw materials. Finally, incomplete discharge from the tank bottom necessitates manual cleaning of residual slurry, affecting production efficiency and batch stability.

[0004] Therefore, there is an urgent need for an integrated pulp mixing device that can achieve efficient mixing, automatic cleaning of tank walls, and promote thorough discharge. Summary of the Invention

[0005] This invention addresses the shortcomings of existing pulp mixing tanks and proposes a new type of pulp mixing tank to solve the aforementioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A pulp mixing tank includes a tank body, a cover fitted to the upper end of the tank body, and a raw material outlet located at the bottom of the tank body. It also includes a first mixing mechanism and a second mixing mechanism: the first mixing mechanism includes a first drive source and a central mixing shaft driven by the first drive source and arranged along the axis of the tank body; the second mixing mechanism includes a second drive source and a sleeve shaft driven by the second drive source and sleeved outside the central mixing shaft. The lower part of the sleeve shaft is connected to a cantilever mixing assembly extending radially along the tank body; the lower end of the central mixing shaft passes through the cantilever mixing assembly and is rotatably supported by a fixed support installed at the bottom of the tank body.

[0007] Furthermore, the cantilever stirring assembly includes a fixed sleeve fixedly connected to the lower end of the sleeve shaft, at least one upper support arm extending outward from the fixed sleeve, a vertical arm connected to the outer end of the upper support arm, and a lower support arm connected to the lower end of the vertical arm; the inner end of the lower support arm is provided with a guide sleeve through which the central stirring shaft passes.

[0008] Furthermore, a first stirring blade is provided on the central stirring shaft, and a second stirring blade is provided on the vertical arm; the rotation direction of the first stirring blade is opposite to that of the second stirring blade, so as to form an axial circulating flow field in the tank.

[0009] Furthermore, the first stirring blade has a right-handed structure to generate an upward axial flow; the second stirring blade has a left-handed structure to generate a downward axial flow.

[0010] Furthermore, a wall scraping element is also installed on the vertical arm, and the outermost radial end of the wall scraping element is in elastic contact with the inner wall of the tank.

[0011] Furthermore, the wall scraping element includes a mounting portion fixed to the vertical arm and a scraping portion made of an elastic material.

[0012] Furthermore, the central stirring shaft includes an upper shaft and a lower shaft connected by a coupling, with the lower shaft passing through the guide sleeve and the fixed support in sequence.

[0013] Furthermore, the lower shaft is provided with a spiral pusher blade located directly above the raw material outlet at its end.

[0014] Furthermore, the second drive source is fixed to the upper surface of the cover by a bracket.

[0015] Furthermore, the end edge of the first stirring blade is formed with a cutting edge for dispersing fiber clusters.

[0016] Compared with the prior art, this utility model has the following advantages.

[0017] This invention utilizes a dual-stirring system operating in synergy. The first stirring mechanism (central shaft) and the second stirring mechanism (sleeve shaft and cantilever assembly) work together to create an upward flow field from the powerful stirring of the central first stirring blade, while the circumferential blades (second stirring blades) create a downward flow field. The combination of these two systems forms a circulating flow field, ensuring thorough mixing of the slurry. Simultaneously, the central blades, with their cutting edges, effectively cut high-fiber slurry while stirring. During the discharge stage, the discharge blades rapidly propel the slurry out, improving discharge efficiency and preventing slurry residue. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0019] Figure 1 This is a schematic diagram of the overall structure of a pulp mixing tank.

[0020] Figure 2 This is a schematic diagram of the first and second stirring mechanisms of a pulp mixing tank.

[0021] Figure 3 This is a schematic diagram of a scraping element for a pulp mixing tank.

[0022] Figure 4 and Figure 5 for Figure 1 A magnified view of a portion of the image.

[0023] In the diagram, 1. Tank body; 2. Cover; 3. Raw material inlet; 4. Raw material outlet; 5. Fixed support; 6. Base; 7. First stirring mechanism; 8. Second stirring mechanism; 9. Bracket; 701. First drive source; 702. Central stirring shaft; 703. Coupling (or connecting flange); 704. Lower shaft section; 705. First stirring blade; 706. Spiral pushing blade; 707. Blade edge; 801. Second drive source; 802. Sleeve shaft; 803. Sleeve shaft fixing sleeve; 804. Upper support arm; 805. Vertical arm; 806. Scraper element; 807. Second stirring blade; 808. Lower support arm; 809. Guide sleeve; 80601. Mounting part (positioning plate); 80602. Scraping part. Detailed Implementation

[0024] To make the objectives, technical solutions, and beneficial effects of the embodiments of this utility model clearer, the present utility model will be described clearly and completely below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, the pulp mixing tank of this embodiment includes a tank body 1, a cover 2, a first mixing mechanism, a second mixing mechanism, and a base 6. The cover 2 is provided with a raw material inlet 3, and the bottom of the tank body 1 is provided with a raw material outlet 4.

[0026] The first stirring mechanism 7 includes a first stirring motor, which serves as a first drive source 701, and its output end is connected to a central stirring shaft 702. A right-handed first stirring blade 705 is fixed on the central stirring shaft, and its end is provided with a cutting edge 707 for dispersing fiber clumps. The lower end of the central stirring shaft 702 is connected to the lower shaft 704 via a coupling 703 (or a connecting flange).

[0027] The second stirring mechanism 8 includes a second stirring motor, which serves as a second drive source 801 and is fixed to the cover 2 via a bracket 9. The output shaft of the second drive source is fixedly connected to a sleeve shaft 802, which is coaxially sleeved around the central stirring shaft 702. Furthermore, the bracket 9 is a U-shaped bracket.

[0028] Specifically, the second stirring motor is connected to a sleeve shaft 802, which is coaxially sleeved around the central stirring shaft 702. The lower end of the sleeve shaft 802 is connected to a cantilever stirring assembly. In this embodiment, the assembly specifically includes a sleeve shaft fixing sleeve 803 fixed to the sleeve shaft 802, an upper support arm 804, a vertical arm 805, and a lower support arm 808 connected thereto. The inner end of the lower support arm 808 is provided with a guide sleeve 809, through which the lower section 704 of the central stirring shaft 702 passes.

[0029] The inner side of the vertical arm 805 is equipped with a left-handed second stirring blade 807. The first stirring blade 705 and the second stirring blade 807 (i.e., the circumferential blades) rotate in opposite directions, forming a strong vertical circulating flow field inside the tank. The first stirring blade is located in the central area, and the second stirring blade is located in the circumferential area. A wall scraping element 806 is also installed on the vertical arm 805. The wall scraping element 806 can be a scraper, specifically composed of a mounting part 80601 (positioning plate) fixed to the vertical arm and a scraping part 80602 (such as a rubber head) that elastically contacts the tank wall. The lowermost end of the central stirring shaft 702 is rotatably supported by a fixed support 5 fixed to the bottom of the tank, greatly enhancing stability. A spiral pushing blade 706, also called a discharge blade, is installed at the end of the lower shaft 704. It is located directly above the raw material outlet 4 to prevent discharge blockage. The discharge blade rotates counterclockwise at the bottom of the tank, generating an axial downward thrust that quickly pushes the slurry out, significantly improving discharge efficiency.

[0030] It should be noted that the first aspect, the wall-scraping element 806 installed on the vertical arm 805 to clean the slurry adhering to the tank wall, is a general term encompassing all components capable of performing the wall-scraping function. In this embodiment, it specifically includes a positioning plate (as mounting part 80601) fixed to the vertical arm 805 by bolts, and a rubber head (as scraping part 80602) installed at the end of the positioning plate by means of a slot or adhesive. The rubber head is made of elastic material, and its outermost radial end maintains elastic contact with the inner wall of the tank 1, which can effectively scrape off the adhering material while avoiding rigid impact damage to the tank wall.

[0031] Second, the lower end of the central stirring shaft 702 (i.e., the end of the lower shaft 704) passes downward through the guide sleeve 809 and the fixed support 5 in sequence. In this embodiment, the fixed support 5 is installed at the bottom of the tank body 1, and is equipped with rolling bearings or sliding bearings inside, which are used to provide rotational support and axial limit for the end of the central stirring shaft 702, thereby enhancing the operational stability and rigidity of the central long shaft system and avoiding shaking during high-speed stirring.

[0032] Furthermore, a spiral pushing blade 706 is fixedly installed at the very end of the central stirring shaft 702 (i.e., the end of the lower shaft 704). This spiral pushing blade 706 is located directly above and coaxially arranged with the raw material outlet 4. When discharging, its rotation can play a positive pushing role, preventing fibrous materials from clogging at the outlet and ensuring smooth discharge.

[0033] Third, a cutting edge 707 is provided on one side of the end of the first stirring blade 705. This cutting edge structure helps to cut and break up fiber clumps in the pulp during high-speed rotation, thereby improving homogenization.

[0034] IV. The first drive source 701 is located above the second drive source 801. The first drive source adopts a first stirring motor 701, and the second drive source 801 adopts a second stirring motor 801. The first stirring motor 701 is set directly above the second stirring motor 801 by a bracket. This layout is compact, makes full use of vertical space, and has a direct transmission path.

[0035] Work process: S1. Close the raw material outlet 4 and put water, pulp fiber and additives into the tank 1 through the raw material inlet 3.

[0036] S2. Start the first drive source 701 and the second drive source 801. The first drive source 701 drives the central stirring shaft 702, the lower shaft 704, and the first stirring blade 705 and the spiral pushing blade 706 on it to rotate clockwise at high speed (viewed from the top of the tank). The right-hand rotating first stirring blade 705 pushes the pulp upward, and its front cutting edge 707 generates a strong stirring and cutting effect on the pulp fiber clumps, realizing powerful crushing and mixing in the core area.

[0037] Simultaneously, the second drive source 801 drives the sleeve shaft 802, causing the annular frame composed of the fixed sleeve 803, upper support arm 804, vertical arm 805, lower support arm 808, and guide sleeve 809 to rotate counterclockwise (viewed from the top of the tank). The scraping element 806 fixed on the vertical arm 805 rotates accordingly, and its scraping part 80602 scrapes off the pulp adhering to the inner wall of the tank body 1 and pushes it back to the main mixing zone. At the same time, the left-hand rotating second stirring blade 807 generates a downward thrust when rotating counterclockwise, causing the pulp to move from top to bottom. As a result, the upward flow caused by the first stirring blade 705 and the downward flow caused by the second stirring blade 807 form a strong vertical circulating flow field in the tank body, which makes the pulp fully and uniformly mixed in both the radial and axial directions, greatly improving the mixing efficiency and uniformity.

[0038] S3. After stirring is complete, stop the second drive source 801. The first drive source 701 switches to counterclockwise rotation. At this time, the right-hand rotating first stirring blade 705 and the spiral pushing blade 706 generate a downward thrust, causing the slurry to gather at the bottom of the tank. Open the raw material outlet 4, and the slurry is quickly and thoroughly discharged from the raw material outlet 4 under the rotational push of the spiral pushing blade 706, effectively avoiding residue at the bottom of the tank. The wall scraping element 806 consists of an installation part 80601 and a scraping part 80602. The scraping part is made of wear-resistant flexible material, has good elasticity, and can form a stable fit with the tank wall. The wall scraping element is fixed to the vertical arm 805 with screws, and can periodically scrape off the slurry adhering to the tank wall during rotation to prevent solid agglomeration.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "preferred embodiment," "detailed description," or "preferred embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Therefore, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of this utility model.

Claims

1. A pulp mixing tank, comprising a tank body (1), a cover (2) fitted to the upper end of the tank body (1), and a raw material outlet (4) disposed at the bottom of the tank body (1), characterized in that, It also includes a first stirring mechanism and a second stirring mechanism: The first stirring mechanism includes a first driving source (701) and a central stirring shaft (702) driven by the first driving source and arranged along the axis of the tank. The second stirring mechanism includes a second drive source (801) and a sleeve shaft (802) driven by the second drive source and sleeved outside the central stirring shaft (702). The lower part of the sleeve shaft (802) is connected to a cantilever stirring assembly extending radially along the tank body. The lower end of the central stirring shaft (702) passes through the cantilever stirring assembly and is rotatably supported by a fixed support (5) installed at the bottom of the tank (1).

2. The pulp mixing tank according to claim 1, characterized in that, The cantilever stirring assembly includes a fixed sleeve (803) fixedly connected to the lower end of the sleeve shaft (802), at least one upper arm (804) extending outward from the fixed sleeve (803), a vertical arm (805) connected to the outer end of the upper arm (804), and a lower arm (808) connected to the lower end of the vertical arm (805); the inner end of the lower arm (808) is provided with a guide sleeve (809) through which the central stirring shaft (702) passes.

3. The pulp mixing tank according to claim 2, characterized in that, The central stirring shaft (702) is provided with a first stirring blade (705), and the vertical arm (805) is provided with a second stirring blade (807); the rotation direction of the first stirring blade (705) is opposite to that of the second stirring blade (807) so as to form an axial circulating flow field in the tank.

4. The pulp mixing tank according to claim 3, characterized in that, The first stirring blade (705) has a right-handed structure and is used to generate an upward axial flow; the second stirring blade (807) has a left-handed structure and is used to generate a downward axial flow.

5. The pulp mixing tank according to claim 2, characterized in that, The vertical arm (805) is also equipped with a wall scraping element (806), the outermost radial end of which is in elastic contact with the inner wall of the tank (1).

6. The pulp mixing tank according to claim 5, characterized in that, The wall scraping element (806) includes a mounting part (80601) fixed to the vertical arm (805) and a scraping part (80602) made of elastic material.

7. The pulp mixing tank according to claim 2, characterized in that, The central stirring shaft (702) includes an upper shaft and a lower shaft (704) connected by a coupling (703), and the lower shaft (704) passes through the guide sleeve (809) and the fixed support (5) in sequence.

8. The pulp mixing tank according to claim 7, characterized in that, The lower shaft (704) is provided with a spiral pusher blade (706) located directly above the raw material outlet (4) at its end.

9. The pulp mixing tank according to claim 1, characterized in that, The second drive source (801) is fixed to the upper surface of the cover (2) by a bracket (9).

10. The pulp mixing tank according to claim 3, characterized in that, The first stirring blade (705) has a cutting edge (707) at its end edge for dispersing fiber clusters.

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