Shearing defoaming stirrer for isoprene rubber production

Abstract

The utility model discloses a shearing defoaming stirrer for isoprene rubber production. The shearing defoaming stirrer comprises a tank body and a stirring assembly, wherein a feeding hole and an air outlet are formed in the upper part of the tank body, and a discharging hole is formed in the lower part of the tank body; the stirring assembly comprises a motor unit, a stirring main shaft, a shearing blade, a spiral stirring blade and an inner barrel; a plurality of shearing blades are arranged on the stirring main shaft, and the shearing blades are arranged at different heights; a spiral stirring blade is arranged on the stirring main shaft; an inner cylinder is arranged on the outer sides of the shearing blades and the spiral stirring blades and is fixed on the inner wall of the tank body through a connecting plate. According to the defoaming tank, defoaming is carried out through shearing force generated by mechanical stirring, a multi-layer shearing defoaming scheme is adopted, the defoaming tank has the advantage of high defoaming efficiency, meanwhile, circulation can be formed in the defoaming tank through the arrangement of the spiral stirring blades and the inner cylinder, and the influence of a foam dead zone is reduced. Furthermore, a filter plate is arranged on the top layer of the defoaming tank, so that foam on the top can be filtered and separated.

Description

Technical Field

[0001] This utility model relates to the field of isoprene rubber production technology, specifically a shear defoaming mixer for isoprene rubber production. Background Technology

[0002] Isoprene rubber (full name cis-1,4-polyisoprene rubber) is a general-purpose synthetic rubber synthesized from isoprene monomer through solution polymerization. Its molecular structure is highly similar to natural rubber, earning it the nickname "synthetic natural rubber." This material possesses excellent elasticity, abrasion resistance, cold resistance, and chemical stability, and is widely used in tires, hoses, and seals. The production process mainly includes polymerization reaction, removal of catalyst residues, dehydration and drying, and molding and packaging. In isoprene rubber production, defoaming is a crucial step in ensuring product quality. If bubbles generated during the polymerization reaction and the flow of intermediate products on the production line are not eliminated in time, they will affect product quality, such as impacting the stability of the drying process, leading to porosity defects in the finished product, and reducing the mechanical strength and density of the rubber.

[0003] Currently, the mainstream defoaming methods include two categories: chemical defoaming and mechanical defoaming. Chemical defoaming reduces the surface tension of the system by adding silicone / ether-based defoamers. However, these exogenous substances are prone to side reactions with rubber molecules, and the residual defoamers can also affect the final product. Traditional stirring devices (such as rake-type and brush-type defoamers) have problems such as low defoaming efficiency and the formation of foam dead zones near the container. Summary of the Invention

[0004] The purpose of this invention is to provide a shear defoaming agitator for isoprene rubber production, in order to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides a shear defoaming agitator for isoprene rubber production, comprising a tank and a mixing assembly; the tank is a rotary cavity structure with a feed inlet and an air outlet at the top and a discharge outlet at the bottom; the mixing assembly includes a motor unit, a mixing shaft, shear blades, spiral mixing blades, and an inner cylinder; the motor unit is located at the top of the tank, and the top of the mixing shaft extends out of the tank and is connected to the motor unit; a plurality of shear blades are arranged on the mixing shaft at different heights; spiral mixing blades are arranged on the mixing shaft; an inner cylinder is arranged outside the shear blades and spiral mixing blades, and the inner cylinder is fixed to the inner wall of the tank by a connecting plate.

[0006] Furthermore, there are two shear blades, respectively located at the bottom and middle of the tank. Each shear blade is disc-shaped with upward and downward shearing wings along its edge, arranged alternately.

[0007] Furthermore, spiral stirring blades are provided in the area between the two shear blades and in the upper area of ​​the middle shear blade, and the spiral stirring blades of the two sections rotate in the same direction.

[0008] Furthermore, the inner cylinder is coaxial with the stirring main shaft, the bottom height of the inner cylinder is higher than the height of the bottom shear blades, and the top height is level with or lower than the top of the upper spiral stirring blades.

[0009] Furthermore, multiple openings are provided on the inner cylinder sidewall at the height of the central shear blade, and filter screens are installed at the openings.

[0010] Furthermore, a number of needle plate units are arranged vertically in the area between the inner cylinder and the tank body; each needle plate unit includes a needle plate and a connecting rod. The needle plate is arranged vertically and fixed to the inner wall of the tank body by the connecting rod. There are gaps between the two sides of the needle plate and the inner wall of the tank body and the outer wall of the inner cylinder. Evenly arranged spikes are provided on both sides of the needle plate.

[0011] Furthermore, a filter plate is provided in the upper part of the inner cavity of the tank. The filter plate includes a bottom plate, a liquid outlet filter plate, and a guide plate. The filter plate is a partially annular plate with a central angle in the range of 60-120 degrees. The outer side is fixed to the inner wall of the tank. The filter plate is arranged at an angle of 10-20 degrees in the horizontal direction. A liquid outlet filter plate is provided on the side of the filter plate with higher height. A guide plate is connected to the end of the liquid outlet filter plate near the axis of the tank. The guide plate is a curved plate, which bends towards the liquid outlet filter plate as it moves away from the axis of the tank. A gap is provided between the other end of the guide plate and the inner wall of the tank. The bottom of the guide plate is fixed to the bottom plate. Micropores are provided on the bottom plate in the area between the liquid outlet filter plate, the guide plate, and the liquid outlet filter plate for filtering and eliminating foam.

[0012] This invention proposes a shear defoaming agitator for isoprene rubber production. It utilizes the shear force generated by mechanical agitation to defoam, employing a multi-layer shear defoaming scheme, resulting in high defoaming efficiency. Furthermore, the spiral agitator blades and inner cylinder create a circulating flow within the defoaming tank, reducing the impact of dead zones. Additionally, a filter plate is installed at the top of the defoaming tank to filter and separate the foam at the top. Attached Figure Description

[0013] Figure 1 This is a cross-sectional schematic diagram of the overall design of this utility model.

[0014] Figure 2 This is a cross-sectional schematic diagram of the tank area of ​​this utility model.

[0015] Figure 3 This is a schematic diagram of the stirring assembly of this utility model.

[0016] Figure 4 This is a partial cross-sectional view of the filter plate area of ​​this utility model. Detailed Implementation

[0017] 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.

[0018] As attached Figure 1-4 As shown, the shear defoaming agitator for isoprene rubber production according to this utility model includes a tank 1 and an agitation assembly 2.

[0019] The tank body 1 has a rotating cavity structure, with a feed inlet 11 and an air outlet 12 at the top, and a discharge outlet 13 at the bottom. To facilitate complete material discharge, the bottom of the tank body 1 is truncated cone-shaped.

[0020] The stirring assembly 2 includes a motor unit 21, a stirring main shaft 22, shearing blades 23, spiral stirring blades 24, and an inner cylinder 25.

[0021] The motor unit 21 is located at the top of the tank 1 and includes a motor and a coupling. The relevant product is a commercially available product, and its specific structure is not protected by this application. The top of the stirring shaft 22 extends out of the tank and is connected to the motor unit 21, and rotates under its drive.

[0022] A plurality of shear blades 23 are provided on the stirring main shaft 22. The shear blades 23 are arranged at different heights. In the attached figure, two shear blades 23 are provided, respectively located at the bottom and middle regions of the tank body 1. The shear blades 23 are disc-shaped, with upward and downward shearing wings 231 on the edges, which are arranged alternately.

[0023] Spiral stirring blades 24 are provided in the area between the two shear blades 23 and in the upper area of ​​the middle shear blade 23, and the spiral stirring blades of the two sections rotate in the same direction.

[0024] An inner cylinder 25 is provided on the outside of the shear blade 23 and the spiral stirring blade 24. The inner cylinder 25 is fixed to the inner wall of the tank body 1 by a connecting plate 252. The inner cylinder 25 is coaxial with the stirring main shaft 22. The bottom height of the inner cylinder 25 is higher than the height of the bottom shear blade 23, and the top height is level with or lower than the top of the upper spiral stirring blade 24.

[0025] The inner cylinder 25 may be provided with uniformly arranged micropores. In the embodiment shown in the figure, a plurality of windows 251 are provided on the side wall of the inner cylinder 25 at the height of the middle shear blade 23, and a filter screen 252 is provided at the window.

[0026] Furthermore, a plurality of vertically arranged needle plate units 3 are provided in the area between the inner cylinder 25 and the tank body 1. Each needle plate unit 3 includes a needle plate 31 and a connecting rod 32. The needle plate 31 is arranged vertically and fixed to the inner wall of the tank body 1 by the connecting rod. There are gaps between the needle plate 31 and the inner wall of the tank body 1 and the outer wall of the inner cylinder 25 on both sides. Evenly arranged spikes 33 are provided on both sides (in the width direction) of the needle plate 31, which can defoam the liquid flowing between the inner cylinder 25 and the tank body 1, and at the same time form turbulence to reduce the dead zone near the inner cylinder and the side wall of the tank body.

[0027] As attached Figure 1 , 4 As shown, a filter plate 4 is provided in the upper part of the inner cavity of the tank. The filter plate 4 includes a bottom plate 41, an outlet filter plate 42, and a guide plate 43. The filter plate 41 is a partially annular plate with a central angle in the range of 60-120 degrees, and its outer side is fixed to the inner wall of the tank. The filter plate 41 is arranged at an angle of 10-20 degrees in the horizontal direction, and the angle of inclination should not be too large. An outlet filter plate 42 is provided on the side of the filter plate 41 with a higher height. A guide plate 43 is connected to the end of the outlet filter plate 42 near the axis of the tank. The guide plate 43 is a curved plate, which bends towards the outlet filter plate 42 as it moves away from the axis of the tank. Its other end has a gap with the inner wall of the tank. The bottom of the guide plate 43 is fixed to the bottom plate 41.

[0028] Micropores (not shown in the attached drawings) are provided on the bottom plate 41 in the area between the liquid outlet filter plate 42, the guide plate 43 and the liquid outlet filter plate 42, for filtering and eliminating foam.

[0029] During use, the liquid level inside the tank is slightly lower than or level with the bottom of the filter plate 4. When the stirring shaft 22 drives the shearing blades 23 and the spiral stirring blades 24, the shearing blades 23 will shear the liquid, removing air bubbles by crushing it. Under the action of the spiral stirring blades 24, the liquid can be driven to move upward or downward in the inner cylinder, thereby achieving circulation of the liquid between the inner cylinder, the tank body, and the inner cylinder. Under the action of the shearing blades 23 and the spiral stirring blades 24, the liquid will form a swirling flow, and the liquid level will rise, allowing the liquid to enter the upper part of the filter plate, thereby achieving defoaming of the filter plate. The guide plate 43 guides the liquid flow and also prevents foam from flowing out. An external suction device can also be added to the upper air outlet 12 to form a certain negative pressure, which is conducive to the elimination of foam.

[0030] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A shear defoaming agitator for isoprene rubber production, comprising a tank and a mixing assembly; characterized in that, The tank is a rotary cavity structure with a feed inlet and an air outlet at the top and a discharge outlet at the bottom. The stirring assembly includes a motor unit, a stirring shaft, shear blades, spiral stirring blades, and an inner cylinder. The motor unit is located at the top of the tank, and the top of the stirring shaft extends out of the tank and connects to the motor unit. Several shear blades are arranged on the stirring shaft at different heights. Spiral stirring blades are arranged on the stirring shaft. An inner cylinder is arranged outside the shear blades and spiral stirring blades, and the inner cylinder is fixed to the inner wall of the tank by a connecting plate.

2. The shear defoaming agitator for isoprene rubber production according to claim 1, characterized in that, There are two shear blades, which are respectively located at the bottom and middle of the tank. The shear blades are disc-shaped with upward and downward shearing wings on the edges, and the upward and downward shearing wings are arranged alternately.

3. The shear defoaming agitator for isoprene rubber production according to claim 2, characterized in that, Spiral stirring blades are provided in the area between the two shear blades and in the upper area of ​​the middle shear blade, and the spiral stirring blades of the two sections rotate in the same direction.

4. The shear defoaming agitator for isoprene rubber production according to claim 3, characterized in that, The inner cylinder is coaxial with the stirring main shaft. The bottom of the inner cylinder is higher than the height of the bottom shear blades, and the top is level with or lower than the top of the upper spiral stirring blades.

5. The shear defoaming agitator for isoprene rubber production according to claim 4, characterized in that, Multiple openings are provided on the inner cylinder sidewall at the height of the central shear blade, and filter screens are installed at the openings.

6. The shear defoaming agitator for isoprene rubber production according to claim 4, characterized in that, A number of needle plate units are arranged vertically in the area between the inner cylinder and the tank body; each needle plate unit includes a needle plate and a connecting rod. The needle plate is arranged vertically and fixed to the inner wall of the tank body by the connecting rod. There are gaps between the two sides of the needle plate and the inner wall of the tank body and the outer wall of the inner cylinder. Evenly arranged spikes are provided on both sides of the needle plate.

7. The shear defoaming agitator for isoprene rubber production according to claim 4, characterized in that, A filter plate is installed in the upper part of the inner cavity of the tank. The filter plate includes a bottom plate, a liquid outlet filter plate, and a guide plate. The filter plate is a partially annular plate with a central angle ranging from 60 to 120 degrees. The outer side is fixed to the inner wall of the tank. The filter plate is arranged at an angle of 10 to 20 degrees in the horizontal direction. The liquid outlet filter plate is installed on the side of the filter plate with higher height. A guide plate is connected to the end of the liquid outlet filter plate near the axis of the tank. The guide plate is a curved plate, which bends towards the liquid outlet filter plate as it moves away from the axis of the tank. The other end of the guide plate has a gap with the inner wall of the tank. The bottom of the guide plate is fixed to the bottom plate. Micropores are provided on the bottom plate in the area between the liquid outlet filter plate, the guide plate, and the liquid outlet filter plate for filtering and eliminating foam.

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