CN106311040B - Staggered shoveling plate type mixer - Google Patents
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- CN106311040B CN106311040B CN201510349360.7A CN201510349360A CN106311040B CN 106311040 B CN106311040 B CN 106311040B CN 201510349360 A CN201510349360 A CN 201510349360A CN 106311040 B CN106311040 B CN 106311040B
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Abstract
The invention provides a staggered shovelling plate type mixer which comprises a mixer main body, wherein the mixer main body rotates along with a rotating shaft, a shovelling plate is installed on the mixer main body, the long edge of the shovelling plate is fixed on the inner wall of the mixer main body, the length direction of the shovelling plate is parallel to the rotating shaft, and the length of the shovelling plate is smaller than that of the cross section where the shovelling plate is located. The blender simple structure for the mixture of granule material, axial mixing efficiency is high, and it is short to reach the required time of axial mixing equilibrium state, and can weaken the influence degree that mixing speed is compared to the major diameter of blender main part, and applicable high-efficient the mixing in the granule material of different rerum natura, filling rate and filling mode.
Description
Technical Field
The invention belongs to the technical field of mixing equipment, and particularly relates to a staggered shoveling plate type mixer.
Background
In the chemical industry, about half of products and three quarters of raw materials belong to granular substances, so that powder engineering for the granular substances obtains wide attention and research, and the powder engineering has common application in the fields of pharmacy, ceramics, cement, coal, metallurgy, food, energy, chemical industry and the like. It is estimated that in the relevant industrial sector, due to the insufficient understanding of the particle flow and mixing mechanisms, the reduction of the utilization efficiency of the industrial plant and the waste of energy consumption due to the problems encountered in the transport and mixing of the particulate material is as high as 40%, which is far from the requirements of optimization of design parameters and saving of energy.
At present, the drum mixer is widely applied to different types of processing processes of mixing, drying, grinding and the like of particulate matters due to the characteristics of strong radial mixing capability, convenience in production and manufacture, easiness in operation and cleaning and the like. However, the axial mixing capability of a roller mixer is relatively weak, and therefore, a smaller roller length-to-diameter ratio is generally used in its design process, thereby reducing the influence of axial mixing on the overall mixing. Even so, the axial mixing efficiency still limits the promotion of the whole mixing efficiency of the roller device to a great extent, and greatly limits the industrial application of the roller device.
CN 102294191 a discloses a mixing device for powder material and granular material, which comprises a mixing cylinder, wherein a shoveling plate is mounted on the inner wall of the mixing cylinder, the shoveling plate is composed of a main shoveling plate and an auxiliary shoveling plate, wherein the main shoveling plate is a plurality of groups of inner helical belts, one end of each group of inner helical belt is directly mounted on the inner wall of the mixing cylinder, the plurality groups of inner helical belts are uniformly distributed, a group of auxiliary shoveling plates are uniformly mounted between mounting gaps of each two groups of main shoveling plates, the auxiliary shoveling plates are blades arranged in reverse to the main shoveling plates, the auxiliary shoveling plates are mounted on the inner wall of the mixing cylinder through a support frame, namely, the auxiliary shoveling plates are mounted in staggered layers with the main shoveling plates, the height is in the range of 0.1-0.6m, but the mixing device has a complex structure and low axial mixing efficiency, and the time required for reaching an axial mixing balanced state is long; CN 203853034U discloses fertile production of tombarthite function is with mixing machine, this mixes machine includes the casing, installs main shaft in the casing through the bearing, installs the flight on the main shaft, the upper end of casing is equipped with the feed inlet, and the lower extreme of casing is equipped with the discharge gate, the flight is 5-10 contained angles with the main shaft, and the inner fixed connection of flight is on the main shaft, and the outer end fixed connection of flight has the spiller, the spiller sets up with the flight is perpendicular, the middle section of flight is equipped with the strip small opening, but, this mixes when being used for the mixture of granule material, blocks the material easily to it is still not good enough to mix the effect.
Disclosure of Invention
The invention aims to provide a staggered shoveling plate type mixer aiming at the defects in the prior art, which is simple in structure, high in axial mixing efficiency and short in time required for reaching an axial mixing balance state, is used for mixing granular materials, and can weaken the influence degree of the length-width ratio of a mixer main body on the mixing efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a mixer, the mixer includes the mixer main part, the mixer main part rotates along with the pivot, the shovelling plate is installed to the mixer main part, the long limit of shovelling plate is fixed in on the inner wall of mixer main part, and the length direction of shovelling plate is parallel with the pivot, and the length of shovelling plate is less than the length of the cross-section that the shovelling plate belongs to.
The number of the shoveling plates is an even number larger than zero.
Preferably, the number of the shoveling plates is 2-10.
Preferably, the number of the shoveling plates is 4 or 6.
The projections of the long edges of the shoveling plates on the rotating shaft are not completely overlapped.
Preferably, the shovelling plates are distributed at equal intervals.
The ratio of the length of the shoveling plate to the length of the cross section where the shoveling plate is located is 0.6-0.9.
Preferably, the lengths of the shoveling plates are the same.
The ratio of the width of the shoveling plate to the width of the cross section where the shoveling plate is located is 0.1-0.5.
Preferably, the width of each flight is the same.
The shoveling plate is vertically arranged on the inner wall of the mixer main body.
The mixer is a conical mixer, a roller mixer, a double-cone mixer, a V-shaped mixer or a square cone mixer.
Preferably, the mixer is a drum mixer.
Preferably, the length to diameter ratio of the drum in the drum mixer is 0.1 to 4.0.
The mixer further comprises a feeding device and a power device, the feeding device is connected with the mixer main body, and the power device is connected with the rotating shaft.
The power device is a motor.
Preferably, the feeding device is a hopper.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the particle mixer provided by the invention, the length of the shoveling plates arranged on the inner wall of the mixer main body is smaller than that of the section of the mixer main body where the shoveling plates are arranged, and the shoveling plates are arranged on the inner wall of the mixer main body in a staggered manner, so that the excellent radial mixing capacity of an original roller can be maintained, the axial mixing efficiency of the mixer is greatly improved, the mixing efficiency respectively reaches 16 times and 5 times of that of a roller mixer without shoveling plates and a roller mixer with full shoveling plates, and the time required for achieving an axial mixing balance state is short;
2. the particle mixer provided by the invention has a simple structure, and can weaken the influence degree of the length-width ratio of the mixer main body on the mixing efficiency;
3. the particle mixer provided by the invention is suitable for efficiently mixing particle materials with different physical properties, filling rates (less than 60%) and filling modes.
Drawings
FIG. 1 is a schematic view of the structure of a drum of a staggered shovelling plate type drum mixer provided in example 1;
wherein, 1, a roller; 2, the left end surface of the roller; 3, the right end surface of the roller; 4, a first shoveling plate on the left side; 5, a second shoveling plate on the left side; 6, a first shoveling plate on the right side; 7, a second shoveling plate on the right side.
FIG. 2 is a schematic diagram of the mechanism of intensive mixing of particulate materials by the staggered shovelling plate type roller mixer provided in example 1;
FIG. 3 is a graph showing the mixing effect of the mixing of the particles at different mixing times in the drum mixer provided in examples 1, 8 and 9;
FIG. 4 is a graph of the effect of the ratio of the major diameter of the drum on the mixing speed of the particulate material;
FIG. 5 is a graph showing the effect of the arrangement of the shovelling plates on the mixing speed of the particles in the drum;
FIG. 6 is a graph showing the effect of the number of shovelling plates installed in the drum on the mixing speed of the pellets.
Detailed Description
The invention provides a mixer which comprises a mixer main body, wherein the mixer main body rotates along with a rotating shaft, a shoveling plate is installed on the mixer main body, the long edge of the shoveling plate is fixed on the inner wall of the mixer main body, the length direction of the shoveling plate is parallel to the rotating shaft, and the length of the shoveling plate is smaller than that of the cross section where the shoveling plate is located.
The number of the shoveling plates is an even number larger than zero.
Preferably, the number of the shoveling plates is 2-10, such as 2, 4, 6, 8 or 10.
Preferably, the number of the shoveling plates is 4 or 6.
The increase of the number of the shovelling plates can promote the radial throwing effect on the particles to a certain extent, but the excessive shovelling plates can reduce the distance between the shovelling plates and cause the particles to be blocked between the shovelling plates, thereby reducing the mixing efficiency of the particles.
In the mixer provided by the invention, the projections of the long sides of the shoveling plates on the rotating shaft are not completely overlapped.
Preferably, the shovelling plates are distributed at equal intervals.
The ratio of the length of the shoveling plate to the length of the cross section is 0.6-0.9, such as 0.65, 0.7, 0.75, 0.8 or 0.85.
The shovelling plates in the mixer can be shovelling plates with the same length or shovelling plates with different lengths.
Preferably, the lengths of the shoveling plates are the same.
The shovelling plate promotes the axial flow guiding effect of the particles along the shovelling plate to a certain extent, and the length of the shovelling plate influences the distribution of the axial tail end of the shovelling plate in the mixer main body, so that the positions of the particles which carry out axial convection motion along the shovelling plate are greatly influenced, and the axial circulation motion of the particles among the shovelling plates is influenced.
The ratio of the width of the shoveling plate to the width of the cross section is 0.1-0.5, such as 0.1, 0.2, 0.3, 0.4 or 0.5.
The shovelling plates in the mixer can be shovelling plates with the same width or shovelling plates with different widths.
Preferably, the width of each flight is the same.
The radial throwing effect of the sheet is increasingly remarkable as the width of the sheet is increased, thereby promoting radial mixing and axial mixing of particles to a certain extent. However, when the width of the flight is relatively close to, or even equal to, half the radial length of the mixer body, some jamming of the pellets between the flights in the drum is likely to occur, which in turn will reduce the axial mixing performance of the pellets.
The shoveling plate is vertically arranged on the inner wall of the mixer main body. The shoveling plate is an upright shoveling plate.
The mixer is a conical mixer, a roller 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 to 1.5.
When the length-diameter ratio of the roller in the roller mixer is 0.1-4.0, the mixer has the best mixing efficiency on the particle materials, the axial mixing performance of the particles is gradually reduced along with the increase of the length-diameter ratio of the roller, but the mixing performance is still higher than that of a conventional non-shoveling plate roller or a full-shoveling plate roller (the shoveling plate length is equal to the length of the roller).
The design of the shoveling plate has very important potential industrial application value due to the fact that the long roller is widely applied in the industry.
The mixer provided by the invention can weaken the influence degree of the length-diameter ratio of the roller on the mixing efficiency of the roller to a certain extent, and provides a design scheme with higher feasibility for the improvement of the particle mixing efficiency in the roller equipment and the further popularization of the application range of the particle mixing efficiency.
The inner walls of the shovelling plate and the mixer main body are provided with smooth or rough surfaces.
The mixer further comprises a feeding device and a power device, the feeding device is connected with the mixer main body, and the power device is connected with the rotating shaft.
The power device is a motor.
Preferably, the feeding device is a hopper.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example 1
Fig. 1 is a schematic view of the structure of a drum 1 in a staggered flight drum mixer. Wherein L, D and R are the length, diameter and half of the roller 1 respectivelyDiameter, LbAnd WbThe length and the width of the shovelling plate are respectively, and omega is the rotating speed of the roller 1. Shoveling plates are axially arranged on the inner wall of the roller 1 along the roller 1, the long edges of the shoveling plates are fixed on the inner wall of the roller 1, the shoveling plates can rotate along with the roller 1, the number of the shoveling plates is 4, and the first shoveling plate 4 on the left side and the second shoveling plate 5 on the left side are both close to the left end face 2 of the roller; the first shoveling plate 6 and the second shoveling plate 7 on the right side are both close to the right end face 3 of the roller, the lengths and the widths of the 4 shoveling plates are the same and are distributed at equal intervals, and the axial direction is along the length L of the roller 1. The length-diameter ratio L/D of the roller 1 is 0.1-4.0, and the length L of the shoveling platebThe ratio L of the length L of the roller 1bThe L is 0.6-0.9, and the width W of the shoveling platebRatio W to radius R of the roller 1bthe/R is 0.1-0.5.
Example 2
A drum mixer has the same structure as the staggered shovelling plate type drum mixer in embodiment 1, and the only difference is that 4 shovelling plates are all installed on the inner wall close to the left end surface 2 of the drum, and the projections of the long edges of the 4 shovelling plates on the rotating shaft of the drum are completely overlapped.
Example 3
The structure of the drum mixer is the same as that of the staggered shovelling plate type drum mixer in embodiment 1, and the only difference is that 4 shovelling plates are all arranged in the middle of a drum, and the projections of the long edges of the 4 shovelling plates on the rotating shaft of the drum are completely overlapped.
Example 4
The structure of the drum mixer is the same as that of the staggered shovelling plate type drum mixer in embodiment 1, and the only difference is that the number of shovelling plates is 2, and the shovelling plates are respectively arranged on the inner wall of the drum close to the left end surface 2 and the right end surface 3 of the drum.
Example 5
The structure of the drum mixer is the same as that of the staggered shovelling plate type drum mixer in embodiment 1, and the only difference is that the number of shovelling plates is 6, wherein 3 shovelling plates are arranged on the inner wall of the drum close to the left end surface 2 of the drum, 3 shovelling plates are arranged on the inner wall of the drum close to the right end surface 3 of the drum, and the distances between the 6 shovelling plates are the same.
Example 6
The structure of the drum mixer is the same as that of the staggered shovelling plate type drum mixer in embodiment 1, and the only difference is that the number of shovelling plates is 8, wherein 4 shovelling plates are arranged on the inner wall of the drum close to the left end surface 2 of the drum, 4 shovelling plates are arranged on the inner wall of the drum close to the right end surface 3 of the drum, and the distances between the 8 shovelling plates are the same.
Example 7
The structure of the drum mixer is the same as that of the staggered shovelling plate type drum mixer in embodiment 1, and the only difference is that the number of the shovelling plates is 10, wherein 5 shovelling plates are arranged on the inner wall of the drum close to the left end surface 2 of the drum, 5 shovelling plates are arranged on the inner wall of the drum close to the right end surface 3 of the drum, and the intervals of the 10 shovelling plates are the same.
Example 8
A beater-free drum mixer, the drum mixer having the same structure as the staggered beater-type drum mixer of embodiment 1, except that: the roller does not contain a shoveling plate.
Example 9
A full-shovelling-plate roller mixer is the same in structure as the staggered shovelling-plate roller mixer in the embodiment 1, and is different in that: the length of the shovelling plate is the same as that of the roller.
And (3) testing the mixing performance:
the mixing quality index employed in the present invention is characterized by the relative standard deviation of the particle concentration in the mixing zone and the results are compared to current conventional drum mixers. The sampling method is a "number grid" method (Chemical Engineering Science 58(2003)401-415), the mixed region is divided into a finite number of grids with the same size, and the concentration of particles in the grids is analyzed accordingly (the number of particles in the grids needs to be greater than a certain value, which is selected as 50). The standard deviation sigma is calculated as (AICHE Journal 48(2002)50-58)
Wherein C is the true concentration of a component, CiIs the concentration of a certain component in the ith sample, and N is the number of samples.
The staggered shovelling plate type roller mixer described in example 1 is used for mixing particulate materials, and the distribution state of particles in the roller at different times is shown in fig. 2. Wherein a, b and c represent the distribution of particles with increasing mixing time. Only a portion of the flight is shown in the figure for clarity of describing the particle motion characteristics. As can be seen from fig. 2, the staggered shoveling plate type roller mixer not only can promote the radial scattering effect of particles, but also can introduce a strong axial flow guiding effect of the particles; furthermore, there is a degree of particle circulation flow at the end faces of the drum. The axial flow guiding function can remarkably promote the axial convection mixing of the particles, so that the overall mixing performance of the particles is effectively improved, and the factor has very important significance for improving the mixing performance of the particles in the roller.
The drum mixers described in example 1, example 8 and example 9 were used for mixing of particulate materials, and the mixing effect at the same mixing time is shown in fig. 3. Wherein, A is a cylinder without shoveling plates, B is a staggered shoveling plate type cylinder, and C is a full shoveling plate type cylinder. As can be seen from the mixing effect in the graph B, as time goes on, the two kinds of particles initially and respectively located in the left and right regions of the drum gradually move in the axial direction, and the mixing degree of the two kinds of particles is increased continuously; the mixing effect of the A and the C on the particles is lower than that of the B, which shows that different arrangement modes of the shoveling plates have great influence on the mixing effect of the particles, and compared with the conventional no-shoveling plate roller and the conventional full-shoveling plate roller, the staggered shoveling plate roller mixer can promote the mixing of the particles more quickly.
The drum mixers described in examples 1, 8 and 9 were used for mixing particulate materials, and the effect of the ratio of the length to the diameter of the drum on the mixing speed of the particulate materials was examined, and the results are shown in fig. 4. As can be seen from the figure, the axial mixing increasing capacity of the staggered shovelling plate type roller mixer shows a certain descending trend along with the increase of the length-diameter ratio of the roller. However, the mixing speed of the staggered blade drum mixer for particulate material is all different and greater than that of the non-blade drum mixer and the full blade drum mixer under several different drum aspect ratios (1, 1.5, 2 and 3). The influence of the length-diameter ratio of the roller on the mixing speed can be weakened by the staggered shovelling plate type roller mixer.
The mixing speed of the particulate material using the drum mixer described in examples 1 to 3 and the drum mixers described in examples 8 and 9 is shown in fig. 5. The relative standard deviation of the particle system varies with the number of revolutions of the drum in the initial side-to-side fill mode of the particles in the drum. In this filling mode, the axial mixing effect that limits the mixing performance of the drum is further amplified and becomes a major limiting factor. As can be seen from fig. 5, compared to the conventional flaskless drum mixer and the full-flaskless drum mixer, the staggered-flaskless drum mixer can significantly improve the axial mixing performance of the particles in the drum, and the mixing efficiency thereof reaches 16 times and 5 times of that of the flaskless drum mixer and the full-flaskless drum mixer, respectively. In addition, the mixing speeds of the drum mixers of examples 1 to 3 are all higher than the mixing speeds of the no-shovelling-plate drum mixer and the full-shovelling-plate drum mixer, which shows that the length of the shovelling plate is reduced, and the improvement of the particle mixing efficiency is facilitated; in addition, the mixing speed of the staggered shovelling plate type roller mixer in the embodiment 1 is higher than that of the roller mixers in the embodiments 2 and 3, which shows that the arrangement mode of the shovelling plates has a great influence on the mixing performance of the particles in the roller, and the staggered shovelling plates are relatively superior in improving the mixing performance of the particles.
The mixing speed of the staggered shovelling plate type roller mixer described in example 1 and examples 4 to 7 for the particulate material at different revolutions is shown in fig. 6. The mixing speed is based on the time evolution curve of the initial left and right particle filling modes and the relative standard deviation. As can be seen from FIG. 6, when the number of the shoveling plates is small (e.g., 2), the mixing performance of the particles in the drum is increased as the number of the shoveling plates is increased. However, the pitch of the shovelling plates decreases as the number of shovelling plates increases, and an excessive number of shovelling plates will cause clogging of particles between the shovelling plates, thereby decreasing the mixing efficiency. As can be seen from the figure, the optimum number of shovelling plates is between 4 and 6.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (9)
1. A staggered shovelling plate type mixer comprises a mixer main body, wherein the mixer main body rotates along with a rotating shaft, and a shovelling plate is installed on the mixer main body;
the ratio of the length of the shoveling plate to the length of the cross section where the shoveling plate is located is 0.6-0.9;
the ratio of the width of the shoveling plate to the width of the cross section of the shoveling plate is 0.1-0.5;
the mixer is a roller mixer;
the length-diameter ratio of the roller is 1-1.5;
the number of the shoveling plates is an even number greater than zero;
the projections of the long edges of the shoveling plates on the rotating shaft are not completely overlapped;
the shoveling plate is vertically arranged on the inner wall of the mixer main body;
the shoveling plates are arranged on the inner wall of the mixer main body in a staggered manner;
the shoveling plates on the left side are close to the left end face of the roller;
the shoveling plates on the right side are all close to the right end face of the roller.
2. The mixer of claim 1, wherein the number of shoveling plates is 2-10.
3. The mixer of claim 1, wherein the number of shovels is 4 or 6.
4. The mixer of claim 1, wherein the shovelling plates are equally spaced.
5. The mixer of claim 1, wherein the shoveling plates are the same length.
6. The mixer of claim 1, wherein the width of each flight is the same.
7. The mixer of claim 1 further comprising a charging device coupled to the mixer body and a motive device coupled to the shaft.
8. A mixer according to claim 7, wherein the motive device is an electric motor.
9. The mixer of claim 7, wherein the feeding device is a hopper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510349360.7A CN106311040B (en) | 2015-06-23 | 2015-06-23 | Staggered shoveling plate type mixer |
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| CN201510349360.7A CN106311040B (en) | 2015-06-23 | 2015-06-23 | Staggered shoveling plate type mixer |
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| CN106311040B true CN106311040B (en) | 2022-07-01 |
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| CN201350401Y (en) * | 2009-01-19 | 2009-11-25 | 山东兄弟科技股份有限公司 | Batch mixer |
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| CN202199301U (en) * | 2011-07-21 | 2012-04-25 | 合肥科德电力表面技术有限公司 | Powder mixer |
| CN203556328U (en) * | 2013-09-27 | 2014-04-23 | 安徽省林锦记食品工业有限公司 | Tilting efficient material mixing device |
| CN203710956U (en) * | 2014-01-06 | 2014-07-16 | 大连海洋大学 | Horizontal-type drum mixer |
| CN203899593U (en) * | 2014-04-30 | 2014-10-29 | 浙江鼎龙化工有限公司 | Stainless steel reaction still |
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2015
- 2015-06-23 CN CN201510349360.7A patent/CN106311040B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2346471A2 (en) * | 2008-10-08 | 2011-07-27 | Sanyasi R. Kalidindi | Method for alternately sifting and blending powders in the same operation |
| CN201350401Y (en) * | 2009-01-19 | 2009-11-25 | 山东兄弟科技股份有限公司 | Batch mixer |
| CN202169152U (en) * | 2011-07-11 | 2012-03-21 | 攀枝花泓兵钒镍有限责任公司 | Mixer roller for laterite nickel ore |
| CN202199301U (en) * | 2011-07-21 | 2012-04-25 | 合肥科德电力表面技术有限公司 | Powder mixer |
| CN203556328U (en) * | 2013-09-27 | 2014-04-23 | 安徽省林锦记食品工业有限公司 | Tilting efficient material mixing device |
| CN203710956U (en) * | 2014-01-06 | 2014-07-16 | 大连海洋大学 | Horizontal-type drum mixer |
| CN203899593U (en) * | 2014-04-30 | 2014-10-29 | 浙江鼎龙化工有限公司 | Stainless steel reaction still |
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