CN116036970A - A vertical double-shaft self-cleaning mixing equipment - Google Patents

Abstract

The invention discloses vertical double-shaft self-cleaning stirring equipment which comprises a stirring tank, wherein a first stirring shaft and a second stirring shaft are rotationally connected in the tank body of the stirring tank, the first stirring shaft is in transmission connection with a first driving motor arranged at the top of the stirring tank, the second stirring shaft is in transmission connection with a second driving motor arranged at the bottom of the stirring tank, the first stirring shaft is provided with a stirring paddle set along the axial direction of the first stirring shaft, the second stirring shaft is provided with a frame type paddle set along the axial direction of the second stirring shaft, and the stirring paddle set and the frame type paddle set are mutually staggered and rotated in the stirring tank, so that the stirring tank has excellent mixing, heat transfer, shearing performance and self-cleaning performance and can be suitable for a stirring and mixing process of a high-viscosity system.

Description

A vertical double-shaft self-cleaning mixing equipment

technical field

The invention relates to the technical field of stirring equipment, in particular to a vertical double-shaft self-cleaning stirring equipment.

Background technique

Polymerization is the process of converting low-molecular-weight monomers into high-molecular-weight polymers, usually including bulk polymerization, solution polymerization, emulsion polymerization, and suspension polymerization. The polymer species exported from the polymerization reactor usually has some small molecule volatile substances remaining, and these remaining small molecule volatile substances usually need to be removed to a certain extent. This process is called polymer devolatilization. For condensation polymerization systems, such as polyester, etc., small molecular substances need to be removed from the polymerization system in time, so that the molecular weight of the polymer can be increased, and high molecular weight and high-performance polymer materials can be obtained. The preparation and devolatilization of polymer materials often involve complex rheological properties such as viscosity, high viscosity, and viscoelasticity. The viscosity of the system gradually increases with the progress of the process. These factors seriously restrict the flow, mixing, heat transfer, mass transfer and polymerization process of the system to proceed smoothly.

Frame-type, anchor-type and ribbon-type impellers are often used in high-viscosity polymerization reactor systems, in which the flow patterns in frame-type and anchor-type agitated tanks are mainly horizontal circular flow, so the overall mixing efficiency is low. There are relatively strong axial flow and radial flow, and its mixing efficiency is better than that of frame and anchor impellers. However, when the viscosity of the polymer system is too high, due to the Weissenberg effect, "rod climbing" or "shaft wrapping" will occur. phenomenon, which seriously restricts the heat transfer, mass transfer and reaction process of the system. Most of the existing mixing equipment adopts a single-shaft stirring system, which has poor self-cleaning ability and unsatisfactory shear performance, which also restricts the heat transfer effect of the system. .

Contents of the invention

(1) Technical problems to be solved

In order to overcome the shortcomings of the existing technology, a vertical double-shaft self-cleaning mixing equipment is proposed, which can be applied to the stirring and mixing process of high-viscosity systems, and has excellent mixing, heat transfer, shear performance, and self-cleaning performance.

(2) Technical solution

The present invention is achieved through the following technical solutions: the present invention proposes a vertical double-shaft self-cleaning stirring equipment, including a stirring tank, the inside of the stirring tank body is rotatably connected with a first stirring shaft and a second stirring shaft, and the first stirring shaft A stirring shaft is connected to the first drive motor on the top of the stirring tank, the second stirring shaft is connected to the second driving motor on the bottom of the stirring tank, and the first stirring shaft is provided with stirring paddles along its axial direction. The second stirring shaft is provided with a frame paddle set along its axial direction, and the stirring paddle set and the frame paddle set alternately rotate in the stirring tank.

Further, the stirring paddle set includes several stirring blades arrayed axially along the first stirring shaft.

Further, the number of the stirring blades is 2-8 and the cross-sectional shape thereof includes but not limited to circle and polygon.

Further, the number of the stirring blades gradually increases along the axial direction of the first stirring shaft.

Further, the frame-type paddle set includes a peripheral frame and a plurality of frame-type paddles arranged radially along the second stirring axis inside.

Further, the number of frame-type paddles is 2-6, and their cross-sectional shapes include but not limited to circles and polygons.

Further, the interior of the first stirring shaft, the second stirring shaft, the stirring paddle group, and the frame paddle group is a hollow structure, and the hollow structure is filled with a cooling or heating medium that enhances heat transfer.

Further, the stirring tank is also provided with a jacket, and a deflector plate for enhancing heat exchange is arranged inside the jacket.

(3) Beneficial effects

Compared with the prior art, the present invention has the following beneficial effects:

A kind of vertical double-shaft self-cleaning mixing equipment mentioned in the present invention can be applied to the stirring and mixing process of high-viscosity system. The interlaced rotation of the group and the frame paddle group stirs in the stirring tank, which can scrape and clean each other while rotating, and has excellent mixing and shearing performance. In addition, the two stirring shafts, the stirring paddle group, and the frame paddle group It is a hollow structure and its interior is filled with cooling or heating medium. The stirring tank is also equipped with a jacket, and a deflector plate for enhancing heat exchange is arranged in the jacket, which can make it have excellent heat transfer effect.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic structural view of the first stirring shaft in Fig. 1 .

Fig. 3 is a schematic structural diagram of the second stirring shaft in Fig. 1 .

1-stirring tank; 2-first stirring shaft; 3-second stirring shaft; 4-first driving motor; 5-second driving motor; 21-stirring paddle; 31-frame paddle.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

A kind of vertical two-axis self-cleaning mixing equipment as shown in Figure 1-Figure 3, comprises mixing tank 1, and the upper and lower ends of tank body of mixing tank 1 are respectively provided with first driving motor 4, second driving motor 5, the first The output end of a driving motor 4 is connected to the first stirring shaft 2 through a coupling, the output end of the second driving motor 5 is connected to the second stirring shaft 3 through a coupling, and the first stirring shaft 2 is connected to the second stirring shaft. The shaft 3 is located at the center of the tank body of the stirring tank 1 and rotates in the tank body. The first stirring shaft 2 is a long axis, the second stirring shaft 3 is a short shaft, and the first stirring shaft 2 is provided with stirring shafts at intervals along its axial direction. Paddle group, the second stirring shaft 3 is provided with a frame-type paddle group along its axial direction, the stirring paddle group and the frame-type paddle group can alternately rotate with each other, and the stirring paddle group includes a number of stirring paddles arrayed axially on the first stirring shaft 2 The blade 21, the frame paddle group includes a peripheral frame, and the frame paddle 31 is arranged inside the frame. The frame paddle 31 is arrayed axially along the second stirring shaft 3, and the stirring paddle 21 and the frame paddle 31 are There is a gap, so the stirring paddle 21 can rotate in the frame of the frame-type paddle 31, and through the interlaced rotation of the stirring paddle 21 and the frame-type paddle 31, they scrape and clean each other, so that self-cleaning can be realized The relative movement between the stirring paddle 21 and the frame paddle 31 can be controlled by adjusting the first driving motor 4 and the second driving motor 5 .

The number of stirring blades 21 is 2-8 and its cross-sectional shape includes but not limited to circular and polygonal. The blades that can be used for the blades can also be inclined blades. Shapes include but are not limited to circles and polygons. Scrapers can also be arranged on the outside of the frame paddle to improve its self-cleaning ability. The frames of the stirring paddles 21 and the frame paddles 31 are arranged alternately. The quantity gradually increases along the axial direction of the first stirring shaft 2, and the distance between the stirring blades 21 and the inner wall of the stirring tank 1 is 2-10mm. In addition, the first stirring shaft 2, the second stirring shaft 3, the stirring blades 21 1. The inside of the frame-type paddle 31 is a hollow structure filled with a cooling or heating medium that enhances heat transfer, and a jacket is also provided in the stirring tank 1, and a deflector plate that enhances heat transfer is arranged in the jacket, which can Make the stirring equipment have excellent heat transfer performance.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Under the premise of not departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention shall fall within the scope of protection of the present invention, and the technical content claimed in the present invention has been fully described in the claims.

Claims (8)

1. a kind of vertical biaxial self-cleaning stirring equipment, it is characterized in that: comprise stirring tank (1), described stirring tank (1) groove body interior rotation is connected with the first stirring shaft (2), the second stirring shaft ( 3), the first stirring shaft (2) is connected to the first drive motor (4) on the top of the stirring tank (1), and the second stirring shaft (3) is connected to the first driving motor (4) on the bottom of the stirring tank (1). Two driving motors (5) are connected by transmission, the first stirring shaft (2) is provided with a paddle group along its axial direction, and the second stirring shaft (3) is provided with a frame paddle group along its axial direction , the stirring paddle group and the frame paddle group alternately rotate in the stirring tank (1). 2. A kind of vertical double-shaft self-cleaning stirring equipment according to claim 1, characterized in that: the stirring blade group includes several stirring blades (21) arranged axially along the first stirring shaft (2) . 3. A kind of vertical double-shaft self-cleaning stirring equipment according to claim 2, characterized in that: the number of the stirring blades (21) is 2-8 and its cross-sectional shape includes but not limited to circular, polygon. 4. A vertical double-shaft self-cleaning stirring device according to claim 3, characterized in that: the number of the stirring blades (21) gradually increases along the axial direction of the first stirring shaft (2). 5. A vertical double-shaft self-cleaning stirring device according to claim 1, characterized in that: the frame-type paddle group includes a peripheral frame and a number of frame-type paddles arranged axially along the second stirring shaft (3). Paddle (31). 6. A vertical double-shaft self-cleaning mixing device according to claim 5, characterized in that: the number of frame-type paddles (31) is 2-6 and its cross-sectional shape includes but not limited to circular , Polygon. 7. A vertical double-shaft self-cleaning stirring device according to claim 1, characterized in that: the first stirring shaft (2), the second stirring shaft (3), the stirring paddle group, and the frame paddle group The inside is a hollow structure filled with a cooling or heating medium that enhances heat transfer. 8. A vertical double-shaft self-cleaning stirring device according to claim 1, characterized in that: the stirring tank (1) is also provided with a jacket, and the jacket is provided with a flow guide for enhancing heat exchange plate.

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