CN106311040B - A staggered plate mixer - Google Patents

Abstract

The present invention provides a staggered plate mixer. The mixer includes a mixer body, which rotates with a rotating shaft. The mixer body is provided with a plate, and the long side of the plate is fixed to the mixer. On the inner wall of the main body of the device, the length direction of the copying board is parallel to the rotation axis, and the length of the copying board is less than the length of the section where the copying board is located. The mixer has a simple structure, is used for the mixing of granular materials, has high axial mixing efficiency, takes a short time to reach the axial mixing equilibrium state, and can weaken the influence of the length-diameter ratio of the mixer main body on the mixing speed. It is suitable for efficient mixing of granular materials with different physical properties, filling rates and filling methods.

Description

A staggered plate mixer

technical field

The invention belongs to the technical field of mixing equipment, and in particular relates to a staggered plate mixer.

Background technique

In the chemical industry, about half of the products and three-quarters of the raw materials belong to particulate matter, so the powder engineering for particulate matter has received extensive attention and research, and has been used in pharmaceuticals, ceramics, cement, coal, metallurgy, It is widely used in the fields of food, energy and chemical industry. It is estimated that in the relevant industrial sectors, due to insufficient understanding of the particle flow and mixing mechanism, the reduction of the utilization efficiency of industrial equipment and the waste of energy consumption caused by the problems encountered in the transportation and mixing of granular materials are as high as 40%. , which is far from the requirements of design parameter optimization and energy saving.

At present, drum mixers are widely used in different types of processing processes such as mixing, drying and grinding of particulate matter due to their strong radial mixing ability, easy manufacturing, and easy operation and cleaning. However, the axial mixing capacity of the drum mixer is weak, so a smaller drum length-diameter ratio is usually adopted in its design process, thereby reducing the influence of the axial mixing on the overall mixing. Even so, the axial mixing efficiency still limits the improvement of the overall mixing efficiency of the drum equipment to a large extent, and greatly limits the industrial application of the drum mixing equipment.

CN 102294191 A discloses a mixing device for powder material and granular material, the mixing device comprises a mixing cylinder, a copying plate is installed on the inner wall of the mixing cylinder, and the copying plate is composed of a main copying plate and an auxiliary copying plate , in which the main copy board is a plurality of groups of inner screw belts, one end of each group of inner screw belts is directly installed on the inner wall of the mixing cylinder, and the multiple groups of inner screw belts are evenly distributed. A set of auxiliary copying boards are evenly installed. The auxiliary copying boards are blades arranged opposite to the main copying board. The auxiliary copying boards are installed on the inner wall of the mixing cylinder through the support frame, that is, they are installed in staggered layers with the main copying board, and the height is 0.1. -0.6m range, but the mixing device has a complex structure, and its axial mixing efficiency is low, and it takes a long time to reach an axial mixing equilibrium state; CN 203853034U discloses a rare earth functional fertilizer production mixer, which mixes The machine includes a casing, a main shaft installed in the casing through bearings, and a copying plate installed on the main shaft. The upper end of the casing is provided with a feeding port, and the lower end of the casing is provided with a discharging port. At an angle of 5-10°, the inner end of the copying board is fixedly connected to the main shaft, the outer end of the copying board is fixedly connected with a shovel, the shovel is vertically arranged with the copying board, and the middle section of the copying board is provided with a strip. However, when the mixer is used for mixing granular materials, it is easy to jam, and the mixing effect is not good enough.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a staggered plate mixer in view of the deficiencies in the prior art. The mixer has a simple structure, is used for mixing granular materials, has high axial mixing efficiency, and is required to achieve an axial mixing equilibrium state. The time is short, and the influence of the aspect ratio of the mixer body on the mixing efficiency can be weakened.

For this purpose, the present invention adopts the following technical solutions:

A mixer, the mixer includes a mixer main body, the mixer main body rotates with a rotating shaft, the mixer main body is equipped with a copying plate, the long side of the copying plate is fixed on the inner wall of the mixer main body, the copying plate is The length direction of the board is parallel to the rotation axis, and the length of the copy board is less than the length of the section where the copy board is located.

The number of the copy boards is an even number greater than zero.

Preferably, the number of the copying boards is 2-10.

Preferably, the number of the copying boards is 4 or 6.

The projections of the long sides of each copy board on the rotating shaft are not completely coincident.

Preferably, the copying plates are distributed at equal intervals.

The ratio of the length of the copy board to the length of the section where it is located is 0.6-0.9.

Preferably, the lengths of each copy board are the same.

The ratio of the width of the copy board to the width of the section where it is located is 0.1-0.5.

Preferably, the width of each copy board is the same.

The copying plate is vertically installed on the inner wall of the mixer main body.

The mixer is a cone mixer, a drum mixer, a double cone mixer, a V-shaped mixer or a square cone mixer.

Preferably, the mixer is a drum mixer.

Preferably, the aspect ratio of the drum in the drum mixer is 0.1-4.0.

The mixer further comprises a feeding device and a power device, the feeding device is connected with the main body of the mixer, and the power device is connected with the rotating shaft.

The power device is a motor.

Preferably, the feeding device is a funnel.

Compared with the prior art, the beneficial effects of the present invention are:

1, the particle mixer provided by the invention, the length of the copy plate installed on the inner wall of the mixer main body is less than the length of the cross section of the mixer main body where the copy plate is located, and the copy plate is staggered and installed on the inner wall of the mixer main body, It can greatly improve the axial mixing efficiency of the mixer while retaining the excellent radial mixing capacity of the original drum. And it takes a short time to reach the axial mixing equilibrium state;

2. The particle mixer provided by the present invention has a simple structure and can reduce the influence of the length-width ratio of the mixer main body on the mixing efficiency;

3. The particle mixer provided by the present invention is suitable for efficient mixing of granular materials with different physical properties, filling rates (less than 60%) and filling methods.

Description of drawings

Fig. 1 is the structural representation of the drum of the interleaved plate type drum mixer provided in Example 1;

Among them, 1, the drum; 2, the left end face of the drum; 3, the right end face of the drum; 4, the first copying board on the left; 5, the second copying board on the left; 6, the first copying board on the right; 7, the first copying board on the right Second copy board.

Fig. 2 is the schematic diagram of the mixing mechanism of the staggered plate-type drum mixer provided in Example 1 to granular materials;

Fig. 3 is the mixing effect diagram of the particles at different mixing moments when the drum mixer provided in Example 1, Example 8 and Example 9 is used for the mixing of granular materials;

Fig. 4 is a graph showing the influence of the aspect ratio of the drum on the mixing speed of the granular material;

Fig. 5 is the influence curve diagram of the arrangement mode of the copying plate on the mixing speed of the particles in the drum;

Figure 6 is a graph showing the effect of the number of plates installed in the drum on the mixing speed of particles.

Detailed ways

The invention provides a mixer, the mixer includes a mixer main body, the mixer main body rotates with a rotating shaft, a copying plate is installed on the mixer main body, and the long side of the copying plate is fixed on the mixer main body. On the inner wall, the length direction of the copy board is parallel to the rotation axis, and the length of the copy board is less than the length of the section where the copy board is located.

The number of the copy boards is an even number greater than zero.

Preferably, the number of the copying boards is 2-10, such as 2, 4, 6, 8 or 10, etc.

Preferably, the number of the copying boards is 4 or 6.

The increase of the number of copying boards can promote its radial throwing effect on the particles to a certain extent, but too many copying boards will cause the reduction of the spacing between the copying boards, which will lead to the blockage of particles between the copying boards, thereby reducing the mixing of particles. efficiency.

As a preferred technical solution, in the mixer provided by the present invention, the projections of the long sides of each copying plate on the rotating shaft are not completely coincident.

Preferably, the copying plates are distributed at equal intervals.

The ratio of the length of the copy board to the length of the section where it is located is 0.6-0.9, such as 0.65, 0.7, 0.75, 0.8 or 0.85.

Each copying board in the mixer can be a copying board of the same length or a copying board of different lengths.

Preferably, the lengths of each copy board are the same.

The copying board promotes the axial flow of particles along the copying board to a certain extent, and the length of the copying board affects the distribution of the axial end of the copying board in the main body of the mixer, so that the axial convection movement along the copying board is carried out. The position of the particles has a greater impact, and affects the axial circulatory movement of the particles between the copying plates.

The ratio of the width of the copy board to the width of the section where it is located is 0.1-0.5, such as 0.1, 0.2, 0.3, 0.4 or 0.5.

Each copying board in the mixer can be a copying board of the same width or a copying board of different widths.

Preferably, the width of each copy board is the same.

As the width of the copy board increases, the radial throwing effect of the copy board becomes more and more significant, thereby promoting the radial mixing and axial mixing of particles to a certain extent. However, when the plate width is close to or even equal to half of the radial length of the mixer body, some of the particles are likely to have some kind of clogging between the plates in the drum, which in turn will reduce the axial mixing performance of the particles.

The copying plate is vertically installed on the inner wall of the mixer main body. The copy board is an upright copy board.

The mixer is a cone mixer, a drum mixer, a double cone mixer, a V-shaped mixer or a square cone mixer.

Preferably, the mixer is a drum mixer.

Preferably, the aspect ratio of the drum in the drum mixer is 0.1-4.0, such as 0.2, 0.5, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, 2.5, 3.0, 3.2, 3.5 or 3.8, etc.

Preferably, the aspect ratio of the drum is 1-1.5.

When the aspect ratio of the roller in the roller mixer is 0.1-4.0, the mixer has the best mixing efficiency for granular materials. With the increase of the aspect ratio of the roller, the axial mixing performance of the particles will gradually decrease. In terms of blending performance, it is still higher than the conventional no-sheet or full-sheet rolls (sheet length equals to roll length).

In view of the wide application of long drums in the industry, the design of the copy board has very important potential industrial application value.

The mixer provided by the invention can reduce the influence of the length-diameter ratio of the drum on its mixing efficiency to a certain extent, and provides a highly feasible method for improving the mixing efficiency of particles in the drum equipment and further promoting its application range. Design.

The inner walls of the copying plate and the mixer body have smooth or rough surfaces.

The mixer further comprises a feeding device and a power device, the feeding device is connected with the main body of the mixer, and the power device is connected with the rotating shaft.

The power device is a motor.

Preferably, the feeding device is a funnel.

The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

Example 1

FIG. 1 is a schematic structural diagram of a drum 1 in a staggered plate-type drum mixer. Wherein, L, D and R are the length, diameter and radius of the drum 1 respectively, L _b and W _b are the length and width of the copy board respectively, and ω is the rotational speed of the drum 1 . A copy board is installed on the inner wall of the drum 1 along the axial direction of the drum 1, the long side of the copy board is fixed on the inner wall of the drum 1, the copy board can rotate with the drum 1, the number of copy boards is 4, and the number of the copy board is 4. A copying board 4 and the second copying board 5 on the left are all close to the left end face 2 of the drum; are the same and are distributed at equal intervals, and the axial direction is the direction along the length L of the drum 1 . The length-diameter ratio L/D of the described drum 1 is 0.1-4.0, the ratio L _b /L of the length L _b of the copying board to the length L of the drum 1 is 0.6-0.9, and the width W _b of the copying board is the same as that of the drum. The ratio W _b /R of the radius R of 1 is 0.1-0.5.

Example 2

A drum mixer, the structure of the drum mixer is the same as that of the staggered plate-copying drum mixer described in Example 1, the only difference is that the four copying plates are installed on the inner wall near the left end face 2 of the drum , and the projections of the long sides of the four copying boards on the rotating shaft of the drum are completely coincident.

Example 3

A drum mixer, the structure of the drum mixer is the same as that of the staggered plate-copying drum mixer described in Example 1, the only difference is that four copying plates are installed in the middle of the drum, and four The projection of the long side of the copy board on the drum shaft is completely coincident.

Example 4

A staggered plate-copying type drum mixer, the structure of the drum mixer is the same as that of the staggered plate-copying type drum mixer described in Example 1, the only difference is that the number of copying plates is 2, which are installed separately On the inner wall of the drum near the left end face 2 of the drum and the right end face 3 of the drum.

Example 5

A staggered plate-copying drum mixer, the structure of the drum mixer is the same as that of the staggered plate-copying drum mixer described in Example 1, the only difference is that the number of copying plates is 6, wherein, 3 copying boards are installed on the inner wall of the drum near the left end face 2 of the drum, 3 copying boards are installed on the inner wall of the drum near the right end surface 3 of the drum, and the spacing of the 6 copying boards is the same.

Example 6

A staggered plate-copying drum mixer, the structure of the drum mixer is the same as the structure of the staggered plate-copying drum mixer described in Example 1, the only difference is that the number of copying plates is 8, wherein, 4 copying boards are installed on the inner wall of the drum near the left end face 2 of the drum, 4 copying boards are installed on the inner wall of the drum near the right end surface 3 of the drum, and the distance between the 8 copying boards is the same.

Example 7

A staggered plate-copying type drum mixer, the structure of the drum mixer is the same as that of the staggered plate-copying type drum mixer described in Example 1, the only difference is that the number of the copying plates is 10, Among them, 5 copying boards are installed on the inner wall of the drum close to the left end face 2 of the drum, 5 copying boards are installed on the inner wall of the drum near the right end surface 3 of the drum, and the spacing of the 10 copying boards is the same.

Example 8

A plateless drum mixer, the structure of the drum mixer is the same as that of the interleaved plate-copying drum mixer described in Example 1, the difference is that the drum does not contain a copying plate.

Example 9

A full plate-copying drum mixer, the structure of the drum mixer is the same as that of the staggered plate-copying drum mixer described in Example 1, the difference is that the length of the plate is the same as the length of the drum.

Hybrid performance test:

The mixing quality index used in the present invention is characterized by the relative standard deviation of the particle concentration in the mixing zone, and the results obtained are compared with current conventional drum mixers. The sampling method is the "number grid" method (Chemical EngineeringScience 58 (2003) 401-415), which divides the mixed area into a limited number of grids with the same size, and analyzes the particle concentration in the grid accordingly (the number of particles in the grid needs to be greater than a certain number of grids). value, which is selected as 50 in this paper). The standard deviation σ is calculated as (AICHE Journal 48(2002) 50-58)

Among them, C is the actual concentration of a certain component, C _i is the concentration of a certain component in the ith sample, and N is the number of samples.

The interleaved plate-type drum mixer described in Example 1 was used for the mixing of granular materials, and the particle distribution states in the drum at different times were shown in FIG. 2 . Among them, a, b and c represent the particle distribution state with gradually increasing mixing time. In order to describe the particle motion characteristics more clearly, only part of the copy plate is shown in the figure. It can be seen from Figure 2 that the staggered plate-type drum mixer can not only promote the radial throwing effect of particles, but also introduce a strong axial guiding effect of particles; in addition, there is a certain degree of particle circulating flow at the end face of the drum. Since the axial convection can significantly promote the axial convective mixing of the particles, resulting in an effective improvement of the overall mixing performance of the particles, this factor is of great significance for improving the mixing performance of the particles in the drum.

The drum mixers described in Example 1, Example 8 and Example 9 were used for the mixing of granular materials, and the mixing effect at the same mixing time was shown in FIG. 3 . Among them, A is a non-sheet copying drum, B is a staggered sheet-copying type drum, and C is a full-sheet copying drum. It can be seen from the mixing effect of B in the figure that with the extension of time, the two kinds of particles initially located in the left and right regions of the drum gradually move in the axial direction, and the mixing degree of the two continues to increase; The mixing effect of the particles is lower than that of B, indicating that the different arrangement of the plate has a great influence on the mixing effect of the particles. Compared with the conventional non-plate roller and full plate roller, the staggered plate-type drum mixer can promote faster Mixing of particles.

The drum mixers described in Example 1, Example 8 and Example 9 were used for the mixing of granular materials, and the effect of the aspect ratio of the drum on the mixing speed of the granular materials was studied. The results are shown in Figure 4. It can be seen from the figure that the axial mixing capacity of the staggered plate-type drum mixer shows a certain downward trend with the increase of the length-diameter ratio of the drum. However, under the conditions of several different drum length-diameter ratios (1, 1.5, 2 and 3), the mixing speed of the staggered plate-type drum mixer for granular materials is greater than that of the non-platen drum mixer and the full-copy plate to varying degrees. Roller mixer. It is indicated that the staggered plate-type drum mixer can reduce the influence of the length-diameter ratio of the drum on the mixing speed.

The tumbler mixers described in Examples 1-3 and the tumbler mixers described in Examples 8 and 9 were used to mix the granular materials, and the mixing speeds were shown in FIG. 5 . The relative standard deviation of the particle system changes with the number of rotations of the drum under the initial left-right filling mode of the particles in the drum. In this filling method, the axial mixing effect that restricts the mixing performance of the drum will be further amplified and become the main limiting factor. As can be seen from Figure 5, compared with the conventional non-platen drum mixer and full platen drum mixer, the staggered platen type drum mixer can significantly improve the axial mixing performance of the particles in the drum, and its mixing efficiency reaches 16 times and 5 times of the non-plate roller mixer and the full plate roller mixer. And, the mixing speed of the drum mixer of embodiment 1-3 is all greater than the mixing speed of the drum mixer without plate copying and the drum mixer of full plate copying, indicating that the length of the plate copying is reduced, which is conducive to the improvement of particle mixing efficiency; , the mixing speed of the staggered plate-copying drum mixer described in Example 1 is greater than the mixing speed of the drum mixers described in Example 2 and Example 3, indicating that the arrangement of the copying plate has a significant impact on the mixing performance of the particles in the drum. Influence, the staggered copy board is relatively superior in improving the particle mixing performance.

Figure 6 shows the mixing speeds of the interleaved plate-type drum mixers described in Example 1 and Examples 4-7 for granular materials at different revolutions. The mixing speed is based on the time evolution curve of the initial left and right particle packing pattern and relative standard deviation. It can be seen from Figure 6 that when the number of copying boards is small (eg 2), as the number of copying boards increases, the mixing performance of the particles in the drum also increases. However, the spacing of the copying boards decreases with the increase of the number of copying boards, and an excessive number of copying boards will lead to blockage of particles between the copying boards, thereby reducing the mixing efficiency. It can be seen from this figure that the optimal number of copies is between 4-6.

The applicant declares that the above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should Changes or substitutions that can be easily conceived within the technical scope all fall within the protection scope and disclosure scope of the present invention.

Claims (9)

1. a staggered copying plate type mixer, the mixer comprises a mixer main body, the mixer main body rotates with a rotating shaft, and the mixer main body is equipped with a copying plate, it is characterized in that, the long side of the copying plate is fixed On the inner wall of the main body of the mixer, the length direction of the copy board is parallel to the rotation axis, and the length of the copy board is less than the length of the section where the copy board is located; The ratio of the length of the copy board to the length of the section where the copy board is located is 0.6-0.9; The ratio of the width of the copy board to the width of the section where the copy board is located is 0.1-0.5; The mixer is a drum mixer; The aspect ratio of the drum is 1-1.5; The number of the copy boards is an even number greater than zero; The projections of the long sides of each copy board on the rotating shaft are not completely coincident; The copying plate is vertically installed on the inner wall of the mixer main body; The copying plate is staggered and installed on the inner wall of the mixer main body; The copying boards on the left side are all close to the left end face of the drum; The copying boards on the right side are all close to the right end face of the drum. 2 . The mixer according to claim 1 , wherein the number of the copying plates is 2-10. 3 . 3 . The mixer according to claim 1 , wherein the number of the copying plates is 4 or 6. 4 . 4 . The mixer according to claim 1 , wherein the copying plates are distributed at equal intervals. 5 . 5 . The mixer according to claim 1 , wherein the lengths of each copying plate are the same. 6 . 6. The mixer according to claim 1, wherein the width of each copying plate is the same. 7 . The mixer according to claim 1 , wherein the mixer further comprises a feeding device and a power device, the feeding device is connected to the mixer main body, and the power device is connected to the rotating shaft. 8 . 8. The mixer of claim 7, wherein the power device is an electric motor. 9. The mixer according to claim 7, wherein the feeding device is a funnel.

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