JP2010104966A - Screen of grinding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding device which has versatility of being able to grind materials of fatty property or materials having a lot of carbohydrate smoothly without an increase in the size of the device, without an increase in the number of processes and without complicating the structure. <P>SOLUTION: The screen of the grinding device puts the powder ground inside a housing having the inner periphery face of circular shape on a swirl flow and discharges it to outside. At least at one point in the peripheral direction of the housing, an opening is provided, and also, a plurality of blades are stretched in parallel in the axis direction of the housing. Also, the blades are projected at the inner periphery face side of the housing. If the ground powder is the size which can pass through the space between the blades at which a part of the screen is projected, it is discharged to the outside of the housing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pulverizing apparatus, and more particularly, to a screen used in a pulverizing apparatus for pulverizing solid materials (hereinafter referred to as solid materials) such as various foods, medical drugs, herbal medicines, chemical products, and samples. Is.

  As this kind of pulverizer, it has been widely practiced to pulverize solid materials such as foods, medical drugs, herbal medicines, chemical products, and feeds into powders.

  In these pulverization processes, the particle shape and particle size distribution of the powder are finished to a constant level.For example, in the food industry and the Chinese medicine industry, the dissolution rate of poorly soluble substances can be accelerated and the absorption rate in the body can be improved. , Improving the content uniformity when mixing chemicals and ingredients.

  Moreover, when mixing each powder, the powder with a large particle size is isolate | separated, and it is in the prescribed powder particle size range, and workability | operativity and food texture are improved.

  By the way, as for the classification process in the pulverizer, generally, there are many systems that use dry classification of internal wind, and screen type, centrifugal classification type, and gap classification type are used.

  Here, as a typical pulverization method, there is a method in which the particle size distribution range of the powder is set by using screen eyes in a particle size distribution in a pin mill, a hammer mill, or the like. Is widely used because it has a simple shape and configuration and uses a highly versatile mesh.

  On the other hand, as a sieving machine alone, a particle size of 20 μm to several mm and coarse powder cutting can be reliably performed. This sieve type uses a net-striking ball or scraper to prevent clogging, or gives vibrations to make the screen easier by applying vibration in the horizontal and vertical directions to make the powder more efficient. Can be shaken.

  However, a method using a mesh for classification in a pulverizer is worth using as it is, but a material having a fat characteristic or a material having a lot of carbohydrates adheres in the machine and cannot be pulverized.

As a method for solving the above-mentioned problem, for example, it is necessary to cope with an increase in the size of the entire apparatus, an increase and complexity of the process, and a dedicated machine. Such a configuration is not preferable because it causes an increase in equipment cost, an increase in product manufacturing time, an increase in machine manufacturing cost, and the like.
JP-A-8-112540

  Therefore, in the present invention, a pulverizing apparatus having versatility capable of smoothly pulverizing a fat material or a material having a large amount of sugar without increasing the size of the apparatus, increasing the number of steps, and complicating the structure. It is an object to provide a screen.

(Invention of Claim 1)
The present invention relates to a screen for a pulverizing apparatus for discharging powder pulverized in a housing having a circular inner peripheral surface onto a swirl flow to the outside, wherein the housing is provided with an opening at least at one position in the circumferential direction of the housing. A plurality of blades are stretched in parallel in the axial direction of the blade, and the blades are projected to the inner peripheral surface side of the housing. If it is large enough to pass through, it will be discharged out of the housing.
(Invention of Claim 2)
The screen of the pulverizing apparatus according to the present invention relates to the invention described in claim 1 above, and the protruding amount of the blade into the housing is 0.5 mm to 1 mm.

  In this type of screen classifier, the peripheral speed of rotation of the pin and the hammer is 100 m / sec or higher in the high speed region, and high speed air current is generated from the subsonic speed region and discharged to the discharge portion. At this time, since the pulverized powder depends on the swirl flow together with the air, a flow in the rotational direction occurs, and the state of the discharge portion is intricately entangled with the powder and air current layers to find the vicinity of the outlet It has become.

  In addition, a crusher and a surface reformer used at a peripheral speed of about 20 m / sec have a weak swirl flow and low pressure, so that the powder slides on the screen surface and discharge efficiency is low.

  Since the screen of the conventional form forms a mesh shape, the opening ratio of the mesh does not exceed 50%, an airflow film of a swirl flow layer is generated on the mesh, and the powder discharging ability is low. It was.

   According to the first aspect of the invention, the flow of the swirling flow is controlled and forcedly discharged by the protruding part of the screen plate in which the formation of the airflow layer and the film becomes thin. Such an effect is greatest when the amount of protrusion of the blade into the housing is 0.5 mm to 1 mm.

(Invention of Claim 3)
The screen of the pulverizing apparatus according to the present invention relates to the invention according to claim 1 or 2, wherein an angle of attack of 10 ° to 30 ° is provided on the projected blade.

 In the above-described inventions according to claims 1 and 2, if the "further blade is provided with an angle of 10 ° to 30 ° on the projecting blade", a further effect is produced.

  That is, according to the third aspect of the present invention, the swirl flow generated with the rotation is separated from the space in the housing into the discharge portion direction and the rotation direction at the moment of leaving the pulverization region, and flows in the discharge portion direction. Powder finer than the screen surface is discharged from the screen. However, the flow rate and pressure of the swirling flow are different depending on the irregularities on the surface, and the discharge rate is not significantly changed from the conventional formation on the flat surface, and the discharge efficiency is also lowered. By providing the protruding blade with an angle of 10 ° to 30 °, the discharge efficiency is further improved.

(Invention of Claim 4)
The screen of the pulverizing apparatus according to the present invention relates to the invention according to any one of claims 1 to 3, wherein a screen having a blade protrusion and an angle of attack is formed.

  According to the present invention, in the invention according to any one of the first to third aspects described above, a screen having an angle facing the protrusion of the blade is formed.

  According to the present invention, the screen is guided to the arrangement position in a slightly larger size and a 360 ° circumferential size depending on the size of the discharge portion in the circumferential direction of the screen. Further, in order to make these more effective, the discharging effect can be increased by shifting the center position of the housing. Accordingly, for example, if the particle size of a screen of 5 mm or less with a narrow blade interval is the target, a 360 ° screen is used for material characteristics that enable clogging prevention and continuous operation. A coarse powder of 5 mm or more and a material that easily adheres in terms of material characteristics can be used as a half-moon screen.

  According to the present invention, it is possible to provide a versatile material capable of smoothly crushing a fat material or a material having a large amount of sugar without increasing the size of the apparatus, increasing the number of processes, and complicating the configuration. .

Embodiments will be described in detail below as the best mode for carrying out the screen of the pulverizing apparatus according to the present invention.
(Embodiment)
FIG. 1 is a front view of the pulverizing apparatus F, FIG. 2 is a partial side sectional view of the pulverizing apparatus F, and FIG. 3 is a front view of a state in which the front lid is opened.
(Overall configuration of this crusher F)
As shown in FIGS. 1 to 3, the pulverizing apparatus F of this embodiment inputs solid materials (hereinafter simply referred to as solid materials) such as various foods, medical drugs, Chinese medicines, chemical products, and samples to be pulverized. Hopper 90, a screw conveyor 91 that moves the solid material put into the hopper 90 to the chute 92, a housing 1 that receives the solid material dropped from the chute 92, and a pulverization provided in the housing 1 Parts 94 and 95 (reference numeral 95 mainly functions as a cutter), an electric motor 96 that rotates the crushing parts 94 and 95 so that the solid material can be crushed, and the screen 3 provided on the lower side of the housing 1. And a pedestal portion 97 that supports the entire crushing device F, and a cart portion 98 that allows the device to move smoothly. In addition, what is shown with the code | symbol 99 is an operation panel.
(Regarding the configuration of the main part of the grinding device F)
"Hopper 90"
As shown in FIG. 1, the hopper 90 is provided so that the solid material is converged and dropped into the screw conveyor 91 by folding in a form gradually narrowing downward, that is, taking an inverted triangular shape in front view. .
"Screw conveyor 91"
As shown in FIG. 2, the screw conveyor 91 has a truss portion 91a having a substantially V-shaped cross section with an open upper end, a helical screw 91b provided in the truss portion 91a, and the screw 91b. The motor 91c is driven, and the solid material is moved by the spiral motion of the screw 91b and is moved to the chute 92 side.
"Shoot 92"
As shown in FIG. 1 and FIG. 2, the chute 92 is provided so that the tip end portion of the screw conveyor 91 protrudes forward and is inserted in the middle of the housing 1.

When the solid material is introduced into the housing 1 through the chute 92, if the chute 92 serving as an input portion is disposed at the upper side instead of the center of the housing 1 as viewed from the front, the solid material becomes the pulverized portion. It can be evenly fed to the inside. This makes it possible to expect an increase in the amount of pulverization, and at the same time, the dispersion of the particle size and the life of the pulverized portion are lengthened.
"Housing 1"
As shown in FIGS. 1 to 3, the housing 1 includes a housing body 10 having a circular inner peripheral surface, a lid portion 11 attached to the housing body 10 via a hinge 12, and the lid portion 11 being closed. It is comprised from the lock part 13 maintained in a state.
“Crushing mechanism 2 constituting grinding parts 94, 95”
As shown in FIG. 2 and FIG. 3, the crushing mechanism 2 connects a pair of ring bodies 20 and 20 arranged at intervals in the front and rear directions with a plurality of rod bodies 21 at equal angular intervals, thereby providing one solid structure. 23 is formed.

  Here, as shown in FIGS. 2 and 3, a crushing portion 94 is rotatably attached to the rod body 21, and a crushing portion 95 is integrally provided on the ring body 20.

  In addition, as shown in FIG. 3, the crushing portion 94 is a rigid member with a zigzag attached to a rectangular plate material that is asymmetrical in the longitudinal direction and is rotatably attached to the rod body. It has become so.

  Further, as shown in FIG. 3, the crushing part 95 is provided with a knife edge part 95a in the rotation direction.

As shown in FIG. 2, the three-dimensional structure 23 has an electric motor 96 attached to the back surface of the housing 1, and a rotating shaft 96 a to which the crushing mechanism 2 is attached so as to rotate integrally with the rotating shaft. .
"Screen 3"
As shown in FIGS. 2 to 5, the screen 3 has an opening 30 at one place which is a lower portion in the circumferential direction of the housing 1 and is arranged in parallel so that a plurality of blades 31 are spanned in the axial direction of the housing 1. Do it. Here, the blade 31 (31 ') is provided so as to protrude on the inner peripheral surface side of the housing 1 (the protruding portion is indicated by reference numeral 32), and the pulverized powder is adjacent to a part of the screen protruding. If the powder is of a size that can pass between the matching blades 31, 31, it can be discharged.

The projecting amount of the blade 31 into the housing 1 is about 0.5 to 1 mm (preferable range), and the projecting blade is provided with an angle of 10 ° to 30 °.
(A) By the way, the conventional screen is a component that is configured only for classification, but the content of this time is limited to the classification only, and the range of use is limited, and it was necessary to change the powder including various types of pulverization. . Therefore, in addition to this classification effect, pulverization is incorporated. As a result, although it is made fine by the pulverization rotor, some beards and large powder particles are inevitably generated.

Therefore, by making a protrusion on the outer surface of the screen, it becomes possible to shear the whiskers and partially large particles, but if the protrusion is too large, it will be worn or in the lower part of the protrusion of the gap with the rotating rotor. Since it is too large, adhesion and welding occur rather than the effect. For this reason, as a result of preparing and trying various materials, it was found that the amount of protrusion from the outer surface of the housing 1 is in a preferable range of about 0.5 to 1 mm.
(B) Further, it has been found that the angular influence varies. It is common to attach the screen wedge to the center, but it has been found that it is more effective to have an angle in order to improve the shearing and grinding force as much as possible. That is, the inclination angle protruding toward the outer peripheral surface of the housing 1 is 10 ° to 30 ° with respect to the tangential direction of the outer peripheral surface of the housing 1.
(C) Further, although one or two protrusions may be provided, the correspondence of materials that are difficult to pulverize, such as fibers that are difficult to pulverize or materials that are rich in oil and lipid, varies depending on the size of the screen eyes. For example, every other piece is best for powders of 150 μm or less, and in terms of quantity and heat, and when clogging is taken into consideration, it is necessary to combine every other part or part of it. It becomes.
(D) The effects of (a) to (c) The first effect is the effect of adding pulverization to the classification effect, and the discharge efficiency is conventionally passed through this eye at the screen eye portion. Generally, the size to be passed is not about 80%.

  In addition, there is a defect that particles having a length smaller than the size of the eye called vertical pulling pass. However, since the longitudinally drawn particle shape is difficult to pass due to the protrusion, a so-called classification effect that the bottom of the particle size distribution shape becomes narrow can be exhibited.

Furthermore, the exhaust efficiency also has the effect of making whiskers and coarse particles finer, and also has the effect of making clogging difficult. It was also verified that the efficiency was improved less.
(E) A specific configuration of the screen 3 employed in the following embodiments is shown.

  The screen 3 of the present invention can be used as a classification device such as a hammer mill, a pin mill and a crusher / surface reformer. Conventionally, a punching screen or a metal thread is simply twisted in a plate to form a mesh, which is utilized from the size of the mesh. However, the discharge efficiency is poor with respect to the material having the material characteristics because of the relation that the flow of the airflow is resisted and the thick air film is formed on the screen. For example, in the case of a raw material such as brown sugar, the punching eye is used with a coarse eye close to 10 mm, and a coarse powder is formed. At the same time, since the discharge efficiency is poor, the discharged powder tends to agglomerate secondary.

  The screen 3 can have an opening ratio exceeding 50% because the angle of attack b and the blade 31 shown in FIGS. 4 to 6 are only in the axial direction. Further, the screen 3 protrudes to make the angle of attack b effective. At the same time, there is no membrane structure due to the air current, and the swirling flow can be easily discharged. This angle of attack can be varied depending on the material properties, desired particle size and adhesion properties. Depending on the material, the method of protrusion c can be selected to form protrusions at intervals or to protrude from the holder f. However, in the case of 10 mm or more, it is preferable that each protrusion is c.

The configuration of the screen 3 fixes the blade 31 with an angle. The length of the blade 31 is longer than the discharge part, and is configured through a holder f extending from the inner end of the grinding part housing to the end not in the axial direction.
When this length is longer than 150 mm, a plurality of replenishment supports may be provided at one or two places in the middle or the like. Furthermore, when the screen is used with a diameter of 5 mm or less, a half-moon-shaped screen or the entire circumference of 360 ° is used. Especially for screens around the circumference, it is possible to deal with materials that are difficult to continuously operate due to the tendency of powder clogging and material characteristics, thus eliminating the need for cleaning.

  The thickness and opening length g of the inner blade 31 of this screen configuration is preferably at least 2 mm to 3 mm, with the thickness being increased in consideration of wear resistance with respect to a material having a large crushing force due to material characteristics. The opening length g is preferably between 3 mm and 5 mm when the gap 30 is 5 mm or less. It is used in the range of 10 ° to 30 ° in terms of angle of attack, but in the case of 10 °, it corresponds to the material that is partially sheared in addition to the classification effect on the powder with uneven pulverization, etc. In the case of 30 °, the adhesion It is suitable for dealing with certain materials and has little resistance to discharge. An angle of attack of 20 ° can be used if intermediate characteristics are seen.

  The cross-sectional shape of the blade 31 or (31 ') is not limited to a plate shape, but may be a triangular shape or a circular shape.

1. Size and shape of the screen 3 It is cylindrical, and the size is a diameter φ270 × length 212 (unit: mm)
2. Opening form of screen 3
A None B Grid screen Aperture 1mm width
C Projection screen 1 mm wide opening (the amount of projection from the outer surface of the housing 1 is about 0.5 to 1 mm)
3. About the change of the material The material consists of 50% wheat flour and 50% powdered fats and oils. A Particle size distribution of the material-The size distribution of the original flour is
D50 = 106.94
Top = 590 μm
B Grinder size 1mm with powder-grid screen crushed and crushed
D50 = 77.96
Top = 297 μm
C Crushing and pulverizing material-gap size by protruding screen 1mm
D50 = 19.27
Top = 210 μm
As is clear from the above A (FIG. 7), B (FIG. 8), and C (FIG. 9), comparing the powder of B with the powder of C, 77.96 → 19. 27, Top (large value) is also reduced from 297 μm to 210 μm.
4). Others A material composed of 50% wheat flour and 50% powdered fats and oils. By making this powder fine, the mixing time and mixing average density greatly contribute to the average of time and taste. Since it was impossible in the past, the mixing time was long and two steps were required.
5). Conclusion From the above, according to the pulverization apparatus having the screen as described above, a material having a fat characteristic or a material having a large amount of sugar without increasing the size of the screen, increasing the number of steps, and complicating the configuration. It is clear that can be crushed smoothly and has versatility.

The front view of the grinding | pulverization apparatus of this invention Example. The partial cross-sectional view of the said grinding | pulverization apparatus. The front view of the state which opened the front cover of the said crushing apparatus. The figure which looked at the screen from the outside. AA sectional view of the screen. The expanded sectional view of the said screen. Particle size distribution of the material-data showing the size distribution of the original powder. Data obtained from a powder-grid screen obtained by crushing and pulverizing a material (particle size distribution chart, etc.). Data obtained by powder-projection screen obtained by crushing and pulverizing the raw material (particle size distribution chart, etc.).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 10 Housing main body 11 Cover part 12 Hinge 13 Lock part 2 Crushing mechanism 20 Ring body 21 Rod body 22 Three-dimensional structure 3 Screen 30 Crevice 31 (31 ') Blade 32 Protrusion part 90 Hopper 91 Screw conveyor 92 Chute 94 Crushing part 95 Grinding part 96 Electric motor 97 Pedestal part 98 Dolly part 99 Operation panel b Angle of attack c Projection f Folder g Opening length

Claims (4)

A screen of a pulverizing apparatus for discharging powder pulverized in a circular housing on an inner peripheral surface to the outside in a swirling flow, wherein an opening is provided in at least one position in the circumferential direction of the housing and in the axial direction of the housing A plurality of blades are stretched in parallel, and the blades are projected to the inner peripheral surface side of the housing, so that the pulverized powder can pass between the blades from which part of the screen projects. By the way, the screen of the crusher characterized by being discharged out of the housing. 2. The screen of the pulverizing apparatus according to claim 1, wherein the protruding amount of the blade into the housing is 0.5 mm to 1 mm. The screen of the pulverizing apparatus according to claim 1 or 2, wherein the projecting blade is provided with an angle of attack of 10 ° to 30 °. 4. The screen of the pulverizing apparatus according to claim 1, wherein a screen having a protrusion angle of the blade and an angle of attack is formed.

Images