Pre-mixer of vertical impregnator for chemi-mechanical pulp

Abstract

The utility model discloses a premixer of a vertical impregnator for chemimechanical pulp, which comprises a stirring device and a driving component arranged above the stirring device, the stirring device comprises a stirring barrel and a stirring component extending into the stirring barrel, and the stirring component is driven by the driving component to stir materials; a plurality of feeding holes are formed in the side wall of the stirring barrel and are distributed along the radial direction and the axial direction of the stirring barrel. According to the mixer, the plurality of feeding holes are uniformly formed in the side wall of the stirring barrel along the radial direction and the axial direction, and materials can synchronously enter the stirring barrel from multiple directions and different heights, so that medicines are uniformly distributed in the stirring barrel, and the stirring efficiency and uniformity are improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical mechanical pulp production equipment, and in particular to a pre-mixer for a vertical impregnator of chemical mechanical pulp. Background Technology

[0002] In the chemimechanical pulping process, in the vertical impregnator of the wood chip impregnation section, wood chips are mixed with various chemicals by a spiral. In order to better mix the wood chips with each chemical, the vertical impregnator has corresponding chemical inlets spaced along the axial direction for each chemical. However, even after the vertical impregnator is stirred by its own spiral, uneven chemical dispersion and local chemical aggregation still occur, making it difficult for the wood chips to achieve the desired mixing effect.

[0003] To address the issues of uneven drug dispersion and localized drug aggregation in vertical impregnators, there is an urgent need for a pre-mixer capable of rapidly and uniformly mixing multiple chemicals within a short time to ensure the effective impregnation of wood chips and chemicals in the vertical impregnator. However, traditional mixers often lack consideration in their feeding design, typically equipped with only one or a few feed inlets in a single location. This makes it easy for different types and batches of chemicals to aggregate and accumulate when entering the mixing tank due to the limited feed inlets, failing to achieve uniform initial distribution. This prolongs the time required for the materials to reach an ideal mixing state, resulting in unstable mixing quality.

[0004] Traditional mixers also lack effective flow-disrupting structures. During the mixing process, the fluid tends to form a relatively fixed circulation pattern, resulting in slow-flowing areas within the mixing tank and affecting the mixing effect. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a pre-mixer for a vertical impregnation machine for chemical pulp.

[0006] The technical solution of this utility model is as follows: it includes a stirring device and a driving component disposed above the stirring device. The stirring device includes a stirring tank and a stirring component extending into the stirring tank. The stirring component stirs the material under the drive of the driving component. Multiple feed ports are provided on the side wall of the stirring tank, and the multiple feed ports are distributed along the radial and axial directions of the stirring tank.

[0007] Furthermore, several flow-disrupting plates are evenly distributed inside the mixing tank, and the length and width of the flow-disrupting plates extend along the axial and radial directions of the mixing tank, respectively.

[0008] Furthermore: the stirring assembly includes a rotating shaft rotatably connected to the stirring tank, and the bottom of the rotating shaft is provided with an anti-sway device, which is a polytetrafluoroethylene anti-sway sleeve.

[0009] Furthermore, the top of the rotating shaft is connected to the output end of the drive assembly and rotates stably under the support of the bearing housing.

[0010] Furthermore: the bearing seat is mounted on the top of the mixing tank via a mounting frame, and a sealing component is provided at the connection between the top of the mixing tank and the rotating shaft to isolate the material inside the mixing tank from the external environment.

[0011] Furthermore: the sealing assembly includes a skeleton oil seal, and a packing is also wrapped around the outer periphery of the skeleton oil seal. The packing is installed through the packing cavity and axial compression is achieved through the packing gland.

[0012] Furthermore, a water distribution ring is provided between multiple packing groups along the axial direction. The water distribution ring is connected to an external water pipe and distributes the water delivered by the water pipe evenly to various parts of the packing.

[0013] Furthermore: the rotating shaft is rotatably connected to the bearing housing via a bearing, a locking nut is provided above the bearing, and a bearing cover is provided above the bearing housing. The locking nut and the bearing cover are respectively used to prevent the inner ring and outer ring of the bearing from moving axially along the rotating shaft.

[0014] Furthermore, the bottom of the mixing tank is provided with several feed inlets.

[0015] Furthermore, the upper part of the mixing tank is provided with a discharge port, from which the mixed material is pumped into the vertical impregnator.

[0016] The beneficial technical effects of this utility model are as follows: By uniformly opening multiple feed ports along the radial and axial directions on the side wall of the mixing tank, the medicine can enter the mixing tank simultaneously from multiple directions and different heights. Whether it is powdered additives, liquid chemical agents or fiber raw materials, they can be evenly dispersed the moment they enter the mixing tank, improving the mixing efficiency and quality of the medicine. The design of the baffle plate can change the flow direction and velocity distribution of the fluid in the mixing tank, so that the fluid forms a complex turbulent state, thereby making the mixing more uniform and thorough and enhancing the mixing effect. Moreover, the separate design of the sealing component from the bearing seat and bearing not only improves the isolation effect between the medicine in the mixing tank and the external environment, but also facilitates the subsequent individual inspection, maintenance and replacement of each component, reducing maintenance costs and difficulties. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a utility model Figure 1 The diagram shows a cross-sectional view of section AA.

[0019] Figure 3This is a schematic diagram of the specific structure of the stirring device and mounting frame of this utility model;

[0020] Figure 4 This is a utility model Figure 3 Enlarged schematic diagram of a local structure;

[0021] The components are as follows: 10. Stirring device; 11. Stirring tank; 12. Rotating shaft; 13. Stirring blades; 14. Mounting cover plate; 20. Mounting frame; 21. Support plate; 22. Support rod; 30. Drive assembly; 40. Coupling; 50. Bearing seat; 60. Locking nut; 70. Bearing gland; 80. Sealing assembly; 81. Skeleton oil seal; 82. Packing; 83. Packing cavity; 84. Water distribution ring; 90. Baffle plate; 100. Anti-sway device; 110. Feed inlet. Detailed Implementation

[0022] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] like Figure 1 and Figure 3 As shown, the present invention discloses a pre-mixer for a vertical impregnator for chemical pulping, comprising a stirring device 10 and a drive assembly 30 mounted above the stirring device 10 via a mounting frame 20. The drive assembly 30 includes a drive motor and a reducer mounted on the motor shaft. The stirring device 10 includes a stirring tank 11 and a rotating shaft 12 passing through and rotatably connected to the stirring tank 11. One end of the rotating shaft 12 is connected to the output end of the reducer via a coupling 40, and the other end of the rotating shaft 12 extends to the bottom of the stirring tank 11. A plurality of stirring components are spaced apart on the outer peripheral wall of the rotating shaft 12 located inside the stirring tank 11. Each stirring component includes a plurality of stirring blades 13 evenly distributed along the outer periphery of the rotating shaft 12.

[0024] In this embodiment, the stirring blade 13 is keyed to the rotating shaft 12.

[0025] Specifically, the top of the mixing tank 11 is provided with a mounting cover plate 14, and the mounting frame 20 is located at the top middle position of the mounting cover plate 14. It includes a support plate 21 for mounting the reducer. The support plate 21 and the mounting cover plate 14 are connected by a support rod 22. The reducer and the coupling 40 are respectively installed on the top and bottom of the support plate 21. A bearing seat 50 is fixedly installed below the coupling 40. The rotating shaft 12 is rotatably connected to the bearing seat 50 through a bearing and rotates stably under the support of the bearing seat 50.

[0026] In this embodiment, the bearing housing 50 is fixedly connected to the support rod 22, a locking nut 60 is provided above the bearing, and a bearing cover 70 is provided above the bearing housing 50. The locking nut 60 and the bearing cover 70 are respectively used to prevent the inner ring and outer ring of the bearing from moving axially along the rotating shaft 12.

[0027] Furthermore, such as Figure 4 The connection between the mounting cover plate 14 and the rotating shaft 12 is provided with a sealing assembly 80 independent of the bearing housing and bearing, which isolates the material inside the mixing tank 11 from the external environment to a certain extent, reduces the erosion and contamination of the bearing housing 50 and bearing by the material, and protects the performance and life of the bearing housing 50 and bearing. In this embodiment, the sealing assembly 80 includes a skeleton oil seal 81, and a packing 82 is also wrapped around the outer periphery of the skeleton oil seal 81. The packing 82 is installed through the packing cavity 83 and is axially compressed by the packing gland, so that the packing 82 is evenly stressed in the circumferential direction, ensuring that the packing 82 is tightly fitted with the rotating shaft 12 and the skeleton oil seal 81 respectively.

[0028] Furthermore, a water distribution ring 84 is provided between multiple packing rings 82 along the axial direction. The water distribution ring 84 can evenly distribute the water transported by the water pipe to various parts of the packing ring 82 to play a lubricating role and prevent the rotating shaft 12 from being damaged by friction with the packing ring 82 during high-speed rotation, thus affecting the service life of the rotating shaft 12 and the packing ring 82.

[0029] In this structure, by installing the bearing housing 50 and the skeleton oil seal 81 on the rotating shaft 12 at intervals, in addition to better sealing the material in the mixing tank 11, it is also convenient to inspect, repair and replace the skeleton oil seal 81, packing 82 and bearings separately, reducing maintenance costs and difficulty. Moreover, when installing and disassembling the bearings and related components, there is no need to directly contact and damage the structure of the mixing tank 11, making the operation more convenient and quick.

[0030] Furthermore, several flow-disrupting plates 90 are evenly distributed inside the mixing tank 11. The length and width of the flow-disrupting plates 90 extend along the axial and radial directions of the rotation shaft 12, respectively. Specifically, the flow-disrupting plates 90 are welded to the inner peripheral wall of the mixing tank 11. When the rotation shaft 12 drives the stirring blades 13 to rotate, the flow-disrupting plates 90 can change the flow direction and velocity distribution of the fluid inside the mixing tank 11, causing the fluid to form a complex turbulent state, thereby making the mixing more uniform and thorough, and enhancing the mixing effect.

[0031] Furthermore, the rotating shaft 12 is arranged vertically. To prevent the rotating shaft 12 from swinging up and down during high-speed rotation, an anti-sway device 100 is provided at the bottom of the rotating shaft 12. In this embodiment, the anti-sway device 100 is a polytetrafluoroethylene (PTFE) anti-sway sleeve. In addition to having good chemical stability, the PTFE anti-sway sleeve also has advantages such as good wear resistance, good self-lubrication, good flexibility and sealing performance, and convenient installation.

[0032] Furthermore, the mixing tank 11 has multiple feed inlets 110 on its body. These feed inlets 110 can be located on the side walls and bottom of the mixing tank 11. The design of multiple feed inlets 110 on the side walls allows materials of different types or states to enter the mixing tank 11 from multiple locations, avoiding material concentration and accumulation. Especially for materials with high viscosity or poor flowability, feeding from multiple layered feed inlets 110 allows the material to be more evenly distributed within the mixing tank 11, improving mixing uniformity. The feed inlet design at the bottom allows the material to tumble upwards from the bottom, while the side wall feeding allows the material to generate shear and convection in the horizontal direction. Combined with the material flow propelled by the mixing blades 13, this creates a more complex flow pattern, reducing dead zones and making the mixing more uniform. The discharge port can be located at the top of the mixing tank 11. After the material is mixed, it is pumped into a vertical impregnator.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pre-mixer for a vertical impregnator for chemimechanical pulp, comprising a stirring device (10) and a drive assembly (30) disposed above the stirring device (10), wherein the stirring device (10) comprises a stirring tank (11) and a stirring assembly extending into the stirring tank (11), the stirring assembly stirring the material under the drive of the drive assembly (30); characterized in that: The mixing tank (11) has multiple feed inlets (110) on its side wall, and the multiple feed inlets (110) are distributed along the radial and axial directions of the mixing tank (11).

2. The pre-mixer for a vertical impregnating chemimechanical slurry according to claim 1, characterized in that: The mixing tank (11) is uniformly distributed with several turbulence-disrupting plates (90), the length and width of which extend along the axial and radial directions of the mixing tank (11), respectively.

3. The pre-mixer for a vertical impregnating chemimechanical slurry according to claim 1, characterized in that: The stirring assembly includes a rotating shaft (12) rotatably connected to the stirring tank (11), and the bottom of the rotating shaft (12) is provided with an anti-sway device (100), which is a polytetrafluoroethylene anti-sway sleeve.

4. The pre-mixer for a vertical impregnating chemimechanical slurry according to claim 3, characterized in that: The top of the rotating shaft (12) is connected to the output end of the drive assembly (30) and rotates stably under the support of the bearing seat (50).

5. A pre-mixer for a vertical impregnating chemimechanical slurry according to claim 4, characterized in that: The bearing seat (50) is mounted above the mixing tank (11) via the mounting frame (20). The top of the mixing tank (11) is connected to the rotating shaft (12) and a sealing component (80) is provided to isolate the material inside the mixing tank (11) from the external environment.

6. A pre-mixer for a vertical impregnating chemimechanical pulper according to claim 5, characterized in that: The sealing assembly (80) includes a skeleton oil seal (81), and a packing (82) is also wrapped around the outer periphery of the skeleton oil seal (81). The packing (82) is installed through the packing cavity (83) and axial compression is achieved through the packing gland.

7. A pre-mixer for a vertical impregnating chemimechanical pulper according to claim 6, characterized in that: A water distribution ring (84) is provided between multiple packings (82) along the axial direction. The water distribution ring (84) is connected to an external water pipe and distributes the water delivered by the water pipe evenly to various parts of the packings (82).

8. A pre-mixer for a vertical impregnating chemimechanical slurry according to claim 5, characterized in that: The rotating shaft (12) is rotatably connected to the bearing housing (50) via a bearing. A locking nut (60) is provided above the bearing, and a bearing cover (70) is provided above the bearing housing (50). The locking nut (60) and the bearing cover (70) are respectively used to prevent the inner ring and outer ring of the bearing from moving axially along the rotating shaft (12).

9. A pre-mixer for a vertical impregnating chemimechanical pulper according to claim 1, characterized in that: The bottom of the mixing tank (11) is provided with several feed inlets (110).

10. A pre-mixer for a vertical impregnating chemimechanical slurry according to claim 1, characterized in that: The mixing tank (11) has a discharge port at the top, from which the mixed material is pumped into the vertical impregnator.

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