JP2007185557A - Electric milling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric milling machine capable of obtaining a particle diameter of a milled powder similar to that in a traditional manual stone mill and making a device to a light weight and a small size as well as the stone mill to a light weight and a small size and economical for home by simplifying the whole mechanism. <P>SOLUTION: The electric milling machine 1 is provided with: a first hand mill 3, which keeps an upper stone mill 31 and a lower stone mill 32 having a lower surface and an upper surface adjacent to each other coaxially arranged, the upper stone mill 31 non-rotatably fixed, and the lower stone mill 32 rotatably supported through a deceleration means 43 by a drive source 41; and a second mill 7 for rough milling provided between the upper stone mill 31 and a hopper 2. A rotation rough milling blade of the second mill 7 is driven coaxially to the lower stone mill 32. The second mill is provided with a means for adjusting a clearance between a fixed rough milling blade and the rotation rough milling blade. The means for adjusting the gap between the fixed rough milling blade and the rotation rough milling blade comprises a means for varying a vertical position of the fixed rough milling blade. Further, the first hand mill may be provided with a clearance adjustment mechanism 33 for adjusting a clearance between the upper stone mill 31 and the lower stone mill 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a small electric grinder that can obtain a powder having a desired particle size distribution, and in particular, a coarse grinding mill and two flat cylindrical millstones are stacked on top and bottom, and one millstone is rotated to form a powder. The present invention relates to a two-stage electric grinder combined with a grinding mill.

  Recently, for hobbies and allergy measures based on homemade tastes, there are cases where udon and soba are hand-made and breaded at home, and the powder is also milled at home in search of handmade. There is demand. Therefore, it is desired to provide an electric grinder that can be used easily without requiring much labor at home. In particular, as a countermeasure against allergic diseases where wheat flour and buckwheat flour do not adapt to the body, there are cases where it is desired to produce bread with rice flour, but it is difficult to obtain rice flour suitable for rice bread production, so there is a demand for milling at home. is there.

  Conventionally, in this type of electric grinder for home use, the upper and lower mortars are often made of metal. This is because when a natural stone such as granite is used as the mortar, the material to be pulverized is pulverized and pulverized using the weight of the mortar itself, resulting in a large mortar and a large and complicated drive mechanism. This is because it is not suitable for home use. However, since the taste of powder is better with a natural stone mill than with a metal mill, there is a need for a household electric grinder that can obtain a powder similar to that of a traditional manual mill.

By the way, the reason why delicious powder can be obtained by grinding powder with a stone mill is roughly stated in “Miwa Shigeo, Coin Books 3“ Recommendation of Stone Mill ”, Kuori, published in 1978” as follows.
(1) No powder burning. In modern high-speed mills, the grinding energy is 100 to 10,000 times that of a millstone, and this energy is instantaneously concentrated in the local part of the grain during grinding, and after grinding, It spreads locally and generates extremely high heat instantaneously. This destroys grains and other tissues. There is no such problem with a stone mill.
(2) Confinement crushing. Because it is pulverized while confined in the eye of a stone mill, it does not touch a large amount of high-speed airflow. Therefore, the scent does not fly and the generation of dust is small.
(3) Blending effect. The millstone has the effect of kneading on the millstone surface simultaneously with grinding. This is a state where fine particles are coated around large particles, and it has a great effect on taking advantage of the natural taste.
(4) Ventilation effect. The groove of the mortar surface, especially the groove of the upper mortar, has good air permeability and prevents heat trapped in the mortar surface. Therefore, even if the pulverized surface is continuously pulverized, the temperature does not rise above the body temperature.
(5) Shear grinding effect. Rather than hitting with a stone mortar, pulverization is carried out mainly by the action of peeling off with a truncation force. This has the effect of crushing without damaging the layered structure inherent to the substance.
(6) Stone rough surface effect. Even if the mortar is made of a metal or grindstone that has the same rough surface as that of the stone mortar, it does not produce the same grinding effect. This is because of the fine surface structure of the stone surface, which catches the particles and prevents heat generation due to sliding friction.
(7) Particle size distribution. When pulverized with a stone mill, the particle size is not so uniform. Coarse particles and fine particles are mixed. Mechanical milling has a uniform grain size but monotonous taste. For example, there is a combined effect in which coarse powder has a flavor and fine powder has a stickiness.

  Because of this effect, powder ground with a stone mill is respected and its flavor is loved.

  By the way, what was disclosed by the following patent document 1 is known as a conventional flour mill. As shown in FIG. 6, this grinding machine 100 has an upper mortar 105 and a lower mortar 106, whose lower surface and upper surface are in frictional contact with each other, arranged coaxially, and are relatively rotated to pulverize grains and the like. It is. The upper die 105 is fixed so as not to rotate, and the lower die 106 is rotated by a motor 108 via a gear 109 of a drive mechanism 107. Further, the upper die 105 and the lower die 106 are provided with flat portions 105a and 106a formed substantially flat and tapered portions 105b and 106b formed on the peripheral edges of the flat portions 105a and 106a on the opposing surfaces, respectively. Grooves are formed only in the flat portions 105a and 106a of the lower die 106. When the upper mill 105 and the lower mill 106 are relatively rotated, the grinder 100 receives a shearing force from the grooves formed in the flat portions 105 a and 106 a of the upper mill 105 and the lower mill 106. , Roughly crushed. Then, the pulverized product is centrifuged, and the centrifuged pulverized product is finely pulverized by the taper portions 105b and 106b at the periphery of the die. Such a mortar becomes larger in the case of pulverizing grains and the like, and therefore, the lower mortar cannot be thinned, and a strong rotating member that supports the mortar is required, making the milling apparatus lightweight and small. Therefore, there is a problem that the apparatus is large and expensive and is unsuitable for home use.

Another type of milling machine disclosed in Patent Document 2 below is also known. As shown in FIG. 7, the mill 120 is provided with a fixed crusher 126 on the upper side and a rotary crusher 127 on the lower side under the hopper 121, and the middle plate 125c is separated on the machine plate 125a. It is arranged along the shaft 125d, a bearing cylinder member 128 is vertically provided on the middle base plate 125c, a slide cylinder 128a is fitted in the bearing cylinder member 128 so as to be slidable up and down, and a main shaft 129 is mounted on the slide cylinder 128a by a bearing 128b. And a rotary crusher 127 is detachably attached to the main shaft 129 via an attaching / detaching mechanism 130, and the fixed crusher 126 is placed between the opposing surfaces above the rotary crusher 127. H is formed and attached to the bearing cylinder member 128. The rotary crusher 127 is rotated by a main shaft 129 that rotates via a gear of the drive unit 133 by a rotation motor 137 provided under the machine base plate 125a. However, this milling machine 120 has a problem that the shape of the stationary crusher 126 is a special shape, the attachment / detachment mechanism is complicated, the device is expensive, and is unsuitable for home use. .
JP 2000-24529 A (FIG. 3, paragraphs [0007] and [0008]) JP 2000-70741 A (FIG. 6, paragraphs [0010], [0011], [0015])

  FIG. 8 is a graph obtained by examining the particle size distribution of upper fresh flour, which is a commercial rice flour manufactured by a specialized processor. According to this, the powder of each particle size is distributed as a fine powder of 83 mesh or more. In order to obtain such fine powder in a grinder, it is conceivable to increase the diameter of the mill and increase the area of the mill. However, enlarging the die causes an increase in size and cost of the apparatus, and there is a problem that it is not suitable for home use, regardless of business use. In addition, as another method, it is conceivable to stack a plurality of mortars with a small diameter in several stages, and several stages of powdering. However, if multiple stages are used, the apparatus becomes larger and complicated, which is inconvenient and expensive. .

  The present inventor has conducted various studies to solve the problems of the conventional grinding machine as described above, and as a result, a coarse grinding mill and a grinding mill composed of an upper millstone and a lower millstone are separated into two stages. By providing a structure and adjusting the particle size of the coarse mill, the milled powder has the same particle size as the traditional manual mill, improving the taste of the powder, and electric milling The present inventors have found that the weight and size of the machine can be reduced, and have completed the present invention.

  That is, the present invention intends to provide a lightweight and small household electric grinder in which the particle size of the milled powder is the same as that of a conventional manual millstone.

  In addition, the present invention aims to provide an economical electric mill for household use by reducing the size and weight of the stone mill and simplifying the overall mechanism.

  Also, in the present invention, by using a two-stage structure of a coarse grinding mill and a grinding mill composed of an upper millstone and a lower millstone, the milled powder has the same particle size as that of a conventional manual millstone. It intends to provide an electric grinder for home use.

  In the present invention, the electric grinding machine according to the first aspect of the present invention is such that an upper mill and a lower mill whose bottom surface and top surface are in contact with each other are arranged coaxially, and the upper mill is fixed so as not to rotate. The lower mill includes a first grinding mill that is rotatably supported by a drive source via a speed reduction means, and a second milling mill provided between the upper mill and the hopper, In the electric grinder that drives the rotary coarse grinder blade of the second die coaxially with the lower stone die, the second die comprises means for adjusting the interval between the fixed coarse grinder blade and the rotary coarse grinder blade. It is characterized by.

  The invention according to claim 2 is the electric grinder according to claim 1, wherein the means for adjusting the interval between the fixed coarse grinder blade and the rotary coarse grinder blade is a vertical position of the rotary coarse grinder blade. It is characterized by comprising means for varying.

  The invention according to claim 3 is the electric grinding machine according to claim 1 or 2, wherein the first grinding mill includes means for adjusting a distance between the upper millstone and the lower millstone. And

  According to invention of Claim 1, it has the 1st grinding mill, the 2nd mill for rough grinding provided between the 1st grinding mill, and the hopper, and the rotary coarse grinding blade of the 2nd mill In this two-stage electric grinder that drives the first grinding mill coaxially with the lower milling mill, the second milling mill adjusts the distance between the fixed coarse grinding cutter and the rotating coarse grinding cutter. By adjusting the grain size of the coarse grinding, the fineness of the milling by the first grinding mill can be adjusted, just as the grain size of the flour is moderately distributed and milled with an old-fashioned manual mill A savory powder can be obtained. In addition, compared with the case where the first grinding mill is enlarged, the processing of the stone mill is simple and inexpensive, and the electric mill can be reduced in size and weight, so that an economical mill for home use is obtained. be able to.

  According to the second aspect of the present invention, the means for adjusting the distance between the fixed coarse grinder blade and the rotary coarse grinder blade comprises means for changing the vertical position of the rotary coarse grinder blade. A powder having a desired particle size distribution can be obtained.

  According to the invention of claim 3, in the electric grinding machine according to claim 1 or 2, since the first grinding mill is provided with means for adjusting the distance between the upper millstone and the lower millstone, Since the particle size distribution and the like can be adjusted by a combination of the adjustment of the interval between the fixed coarse grinding blade and the rotary coarse grinding blade of the second mortar, a savory and similar powder to an old-fashioned manual stone mill can be obtained. In addition, it is possible to obtain a good degree of grinding by setting an appropriate particle size distribution suitable for the type of grain.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies an electric grinder for embodying the technical idea of the present invention, and is not intended to specify the present invention. Other embodiments within the scope are equally applicable.

  FIG. 1 is a front sectional view showing a configuration of a main part of an electric grinder according to an embodiment of the present invention. The grinding machine 1 is roughly divided into a hopper part 2, a coarse grinding mill part 7, a grinding mill part 3, a driving part 4, a discharge part 5 and a machine base part 6, and details of the machine base part 6 are not shown. Each component is formed by attaching a leg frame to a substrate in a cylindrical body 62 formed on the machine base.

  The hopper 2 has a funnel-shaped introduction cylinder 21 formed in the upper part of the electric grinder 1, and an upper opening 21 a of the introduction cylinder 21 serves as an inlet for an object to be crushed. 22 can also be attached. When the material to be crushed is charged, the material is fed from the introduction port 21b in the central portion to the grinding mill portion 3 in the lower portion thereof through the coarse grinding die portion 7.

  The grinding mill portion 3 has an upper mill 31 and a lower mill 32 that are in contact with each other on the lower surface and the upper mill. The upper mill 31 is fixed in a non-rotatable manner, and the lower mill 32 is a main shaft 30 a in the bearing 30. It is attached to a joint 30d connected to, and is rotatably supported. The upper stone mortar 31 and the lower stone mortar 32 are formed of natural stone such as granite, for example, and have a disk shape, and have a diameter of 10 to 20 cm and a thickness of about 20 mm. In addition, when the diameter is about 10 to 20 cm, if the diameter is less than 10 cm, the residence time of the object to be pulverized in the die cannot be sufficiently ground and the desired particle size cannot be obtained. Because. Moreover, if it exceeds 20 cm, the weight of the lower stone mill becomes too heavy, and a large drive source is required to rotate the mill, and the apparatus becomes large, making it unsuitable for home use.

  The lower surface of the upper stone mill 31 and the upper surface of the lower stone mill 32 are engraved with streaks made of unevenness for grinding and grinding grains. The streak extends from the inside to the outside of each section of the board divided into a plurality of sections, and the lower stone 32 is inclined rearward in the rotational direction to form a plurality of concave grooves and convex portions. In FIG. 31, a plurality of concave grooves and convex portions are formed symmetrically with the lower stone mill 32 so that the direction of the grooves intersects. The lower stone mortar 32 is pivotally supported by a rotation motor 41 via a speed reduction means 43 of the drive unit 4. In this type of grinder, the upper surface of the lower mill is normally formed as a conical surface protruding upward, and the lower surface of the upper mill is formed in an inverted conical shape that is recessed toward the center to match it. However, in this embodiment, since each of the contact surfaces of the upper stone mill 31 and the lower stone mill 32 is configured as a horizontal plane, it is easy to process the stone mill, and an inexpensive and economical electric grinder is provided. Obtainable.

  The gap G between the contact surfaces of the upper stone mill 31 and the lower stone mill 32 is changed by the gap adjusting mechanism 33 so that the contact pressure can be appropriately adjusted according to the type of the object to be crushed and the particle size distribution of the milled powder can be controlled. It has become. The upper stone mill 31 on the fixed side is fixed so as not to move by inserting the claw 35 provided on the upper support base 34 fixed to the machine body 62 and the hopper portion 2 into the hole 36 on the upper surface, and is firmly held. The lower-side stone mill 32 on the rotating side is placed in a pan-like lower support base 38 that can be moved up and down so that the lever 37 of the distance adjusting mechanism 33 can be moved toward and away from the upper-side stone mill 31 on the fixed side. It is accommodated and placed on and held by elastic support means 39 attached to the bottom of the lower support base 38.

  The elastic support means 39 is provided at a plurality of locations of the lower support base 38 so as to support the lower surface of the lower stone mortar 32, and applies an upward pressure elastically. The elastic support means 39 wraps, for example, a compression coil spring 39a and a ball 39b made of metal or ceramic that is rotatably supported by a metal plate 39e placed on the compression coil spring 39a in a cylindrical body 39c. The part is exposed from the cylindrical body 39c. Since the elastic support means 39 needs to support at least three points in order to support the lower stone mill 32 without distortion, it supports the lower stone mill 32 at least at three locations. In this way, the lower stone mortar 32 is supported so that the pressure contact force of the compression coil spring 39a is applied via the rotating ball 39b of the elastic support means 39, so that its rotation is not hindered.

  Further, the elastic support means 39 may have a vertically movable means 39d in order to vary the pressure in the vertical direction. The movable means 39d may be, for example, a stator having a screw groove that is screwed into a screw thread provided on the outer surface of the cylindrical body 39c, or a ring-shaped ring that can move up and down and supports a plurality of elastic support means 39. A single plate may be used. If the elastic support means 39 has a movable means 39d for changing the pressure in the vertical direction and the contact pressure of the elastic support means 39 can be changed, a more appropriate contact pressure suitable for the type of grain is set. As a result, a good degree of grinding can be obtained. Moreover, the grinding mill part 3 can adjust the pulverized state by a grinding mill by providing the means which adjusts the space | interval between an upper millstone and a lower millstone.

  As described above, the lower millstone 32 has a plurality of elastic support means 39 for urging the lower millstone 32 in the direction of the upper millstone 31, so that it is forcibly pressed against the upper millstone 31 with an appropriate pressure while rotating. The pressing force is dispersed by the plurality of elastic support means 39, and a uniform and tight pressing force can be applied to the lower surface of the lower stone mortar 32. Further, since the upper stone mill 31 is supported by these elastic support means 39 so as to be in contact with the lower stone mill 32 to which a uniform pressure contact force is applied, powder milled to a desired particle size is obtained. Further, since the lower millstone 32 is forcibly pressed against the upper millstone 31, it is possible to apply a weight more than the weight of the upper millstone 31, so the weight of the upper and lower mills can be reduced and the weight can be reduced. The electric grinder 1 can be reduced in size and weight.

  The machine base unit 6 constitutes a basic part of the grinding machine 1 and incorporates a power switch and a control part (not shown), and a part thereof supports the rotation motor 41 of the drive unit 4. The rotation motor 41 is mounted with the rotation shaft 42 facing upward, protrudes upward, and is engaged with the speed reduction means 43. The machine base 6 is provided with a timer.

  The rotation motor 41 of the drive unit 4 rotates the lower stone mill 32 via the speed reduction means 43. As shown in FIG. 1, the speed reduction means 43 includes a speed reduction mechanism including three stages of gears 43 a to 43 c, and the speed reduction mechanism is mounted between the chassis 45 a and 45 b supported by the support column 44. A drive gear 46 is attached to the rotation shaft 42 of the rotation motor 41 attached to the lower surface of the chassis 45a. An intermediate gear 47b is attached between the chassis 45a and 45b by the intermediate shaft 47, a driven gear 43a is attached to the lower end of the main shaft 30a, and the initial gear 43c is driven by the drive gear 46 of the rotation motor 41 as shown in FIG. Then, the main shaft 30a is rotated at a reduced speed through the intermediate gear 43b and the driven gear 43a, and the lower stone mill 32 is rotated.

  The discharge part 5 is for discharging the pulverized material such as cereal powder pulverized by the grinding mill part 3, and forms a powder discharge port facing the gap G of the grinding mill part 3. The lower support base 38 is provided with a take-out port 51 near the discharge port, and a powder basket 52 is detachably disposed in the take-out port 51.

  In each of the above-described configurations, the speed reduction mechanism 43 is provided on the drive unit 4 of the machine base 6, the grinding mill part 3 is provided on the speed reduction mechanism 43, and the coarse grinding mill 7 and the hopper part 2 are provided on the grinding mill part 3. Are assembled to form the electric grinder 1. Then, when grains such as rice to be crushed are put into the hopper 2, the grains are coarsely ground by the coarse grinding die 7 from the inlet 21 b in the lower central portion of the hopper introduction cylinder 21, and then the grinding mortar. It falls on the part 3 and is crushed and ground by the grinding mill part 3 to become powder, collected by a brush (not shown) attached to the lower stone mill 32, and discharged from the discharge part 5. An object to be crushed such as cereal powder passes through a take-out port 51 of the discharge portion 5 and is stored in a powder basket 52 that is detachably disposed in the take-out port 51.

  The mechanism of the grinding part of the coarse grinding mill 7 provided on the upper part of the grinding mill part 3 has a structure similar to a mill for grinding coffee beans. Specifically, a hopper receiving cylinder 72 is provided below the introduction cylinder 21 of the hopper, the hopper receiving cylinder 72 is connected to the introduction cylinder 21 to form an introduction path 73, and a fixed coarse grinding blade 74 is provided on the inner peripheral surface thereof. Yes. In the center of the hopper barrel 72 provided with the fixed coarse grinding blade 74, the main shaft 30a of the grinding mill part 3 connected to the rotary shaft 42 of the motor 41 for rotation via the speed reduction means 43, and the second shaft 30b. A rotating rough grinding blade 75 is provided which is fixed to the third shaft 30c connected to each other and interlocks with the rotation of the main shaft 30a. Reference numeral 30 denotes a bearing for the main shaft 30a. The rotary coarse grinding blade 75 can be moved up and down by adjusting the position of the rotary coarse grinding blade 75 by adjusting a distance adjusting device 76 that is a means for changing the vertical position of the rotary coarse grinding blade 75. ing. The clearance between the fixed coarse grinder blade 74 and the rotary coarse grinder blade 75 can be adjusted by slightly moving the rotary coarse grinder blade 75 up and down by fine adjustment of an interval adjusting device 76 attached to the rotary coarse grinder blade 75. This will discharge powders of different particle sizes. By adjusting the particle size of the primary pulverization by the coarse grinding die 7, the particle size distribution of the powder obtained in the grinding die 3 can be adjusted.

  As described above, the driving gear 46 is attached to the rotating shaft 42 of the rotating motor 41 attached to the lower surface of the chassis 45a, and the initial gear 43c is interlocked with this. An intermediate gear 43b is attached to an intermediate shaft 47 provided between the chassis 45a and the chassis 45b, a driven gear 43a is attached to the lower end portion of the main shaft 30a, and a necessary reduction is performed by the rotation motor 41 via the gears 43a to 43c. And the main shaft 30a is rotated.

  The third shaft 30c, which is the shaft of the rotary coarse grinding blade 75, is connected to the second shaft 30b protruding in the concave portion of the upper stone mill 31 of the grinding mill portion 3 so as to rotate. The rotary coarse grinding blade 75 is fastened and fixed to the third shaft 30c with a nut of the interval adjusting device 76, and the coarse grinding die 7 is disassembled and removed by removing the nut. Further, since the grinding mill part 3 can also separate the main shaft 30a and the second shaft 30b, after removing the coarse grinding mill 7, the grinding mill part 3 is unfixed, and the upper mill mill 31 and the lower mill mill are removed. 32 can be disassembled and removed. As described above, the coarse grinding mill part 7 and the grinding mill part 3 are made into blocks, so that they can be easily removed and can be easily disassembled for cleaning and maintenance.

  The results of milling with such an electric mill are shown in the graphs of Tables 1 to 2 and FIGS. 3 to 4 below. Table 1 and FIG. 3 show the results of milling with the coarse grinding die 7, and the powder having a particle size of 83 mesh or less accounts for 91.4%. When this is further milled once by the grinding mill part 3, as shown in Table 2 and FIG. 4, the powder having a particle size of 83 mesh or less is 30.4%, and the powder having a particle size of 83 mesh or more and 235 mesh or less is 69.4. %, Powder having a particle size of 83 mesh or more mixed with various particle sizes is obtained.

次に、粗挽き用臼７による製粉において、固定粗挽き刃７４と回転粗挽き刃７５との間隙を０．５ｍｍ、０．７５ｍｍ及び１．０ｍｍの３系列に変えて製粉し、これをさらに挽き臼部３で製粉した結果を表３及び図５に示す。

Next, in the milling with the coarse grinding die 7, the gap between the fixed coarse grinding blade 74 and the rotary coarse grinding blade 75 is changed to three series of 0.5 mm, 0.75 mm, and 1.0 mm, and this is further performed. The results of milling with the grinding mill part 3 are shown in Table 3 and FIG.

この結果を見ると、次のような傾向が見られる。
１） 系列１（０．５ｍｍ）：隙間が狭いと、８３メッシュ以上で各粒度のパーセンテージは、他系列に比較し量が大きく（１０％前後）、分布が均される傾向がある。
２） 系列２（０．７５ｍｍ）：隙間が中程度であると、８３メッシュ以上においても中程度となり、２００メッシュ以上では系列１を抑えてトップとなる。ばらつきが大きい。
３） 系列３（１．０ｍｍ）：隙間が大きいと、８３メッシュ以下が７６．１％と圧倒的な量である。他系列に比べ８３メッシュ以上では最も少なく、粒度分布は下限集中型である。
４）図５の系列１、２、３は、図８の粒度分布と比較すると、全体としては８３メッシュ以下が多いものの、粗挽き用臼の間隔を狭くすると市販の粉に近付く。挽き臼部の圧力を調整すればさらに微細粉が増加することになる。

Looking at the results, the following trends can be seen.
1) Series 1 (0.5 mm): When the gap is narrow, the percentage of each particle size is 83 mesh or larger, and the amount is larger (around 10%) than other series, and the distribution tends to be leveled.
2) Series 2 (0.75 mm): When the gap is medium, it becomes medium even at 83 mesh or more, and when it is 200 mesh or more, the series 1 is suppressed and becomes the top. Variation is large.
3) Series 3 (1.0 mm): When the gap is large, 83 mesh or less is an overwhelming amount of 76.1%. Compared to other series, the smallest is 83 mesh or more, and the particle size distribution is the lower limit concentration type.
4) Compared with the particle size distribution in FIG. 8, the series 1, 2, and 3 in FIG. 5 generally have 83 mesh or less as a whole, but approach the commercial powder when the interval between the coarse grinding dies is narrowed. If the pressure of the grinding mill part is adjusted, the fine powder further increases.

  In the electric grinding machine of the present invention, the material to be crushed by the coarse grinding blades 74 and 75 is guided to the grinding mill part 3 by the introduction path 73 and dropped into the hole in the central part of the upper stone mill 31. Then, it is ground by the upper stone mill 31 and the lower stone mill 32 and milled into a fine particle size powder. When this two-stage pulverization is applied to the production of rice flour, it is pulverized to a powder having a particle size of approximately 83 mesh or less by the coarse grinding mill part 7, and the powder having a particle size of 83 mesh to 235 mesh is obtained by the grinding mill. Since it is possible to mill so as to occupy 65% or more, it is possible to obtain a preferred flavor for the powder by changing the particle size distribution of the powder. In this way, the particle size distribution of the powder obtained by changing the gap between the fixed coarse grinder blade 74 and the rotating coarse grinder blade 75 can be changed. A powder having a desired particle size distribution in which various particle sizes are appropriately mixed can be provided.

  As described above, the object to be crushed by the coarse grinding mill 7 is guided to the grinding mill section 3 and ground by the upper mill mill 31 and the lower mill mill 32 to be pulverized into a fine particle size powder. When this two-stage pulverization is applied, the size of the lower mortar 32 and the upper mortar 31 can be smaller to obtain a powder having the same particle size distribution as compared with the one-stage milling. Can be. In addition, the weight of the upper and lower mortars can be reduced, the weight can be reduced, and a compact and lightweight electric grinder can be provided.

  Regardless of the embodiments described above, the present invention can be used for milling of not only rice but also grains such as wheat, soybeans, corn, dried mushrooms, boiled, eggshell, dried shrimp, tea leaves, Chinese herbal medicine raw materials and the like.

  In addition, the present invention is not limited to the above-described embodiment, and the structure and form of the hopper portion, the coarse grinding die portion, the grinding die portion, the drive portion, the discharge portion, and the machine base portion can be appropriately changed. .

FIG. 1 is a front sectional view showing a configuration of an electric grinder according to an embodiment of the present invention. FIG. 2 is an explanatory view of the speed reduction means in the embodiment of FIG. FIG. 3 is a graph showing the particle size distribution of the powder ground by the coarse grinding die according to the example. FIG. 4 is a graph showing the particle size distribution according to one example of the powder obtained by grinding the powder of FIG. 3 with a grinding mill. FIG. 5 is a graph showing the particle size distribution when the gap of the coarse grinding die is changed. FIG. 6 is a longitudinal sectional view showing a main part of an example of a conventional grinder. FIG. 7 is a longitudinal sectional view showing a main part of another example of a conventional grinder. FIG. 8 is a graph showing the particle size distribution of commercially available top fresh powder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grinding machine 2 Hopper part 3 Grinding mill part 4 Drive part 5 Discharge part 6 Machine base part 7 Coarse grinding mill 21 Introducing cylinder 21a Upper opening 21b Inlet 22 Cover member 30 Bearing 30a Main shaft 30b Second shaft 30c Third Shaft 31d joint 31 upper millstone 32 lower millstone 33 spacing adjustment mechanism 34 upper support base 38 lower support base 39 elastic support means 39a compression coil spring 39b metal ball 39c cylinder 39d movable means 41 motor for rotation 42 rotation shaft 43 speed reduction means 45a 45b Chassis 74 Fixed coarse grinding blade 75 Rotating coarse grinding blade 76 Spacing adjustment device

Claims (3)

  An upper mill and a lower mill whose bottom surface and upper surface are in frictional contact with each other are arranged coaxially, the upper mill is fixed so as not to rotate, and the lower mill is supported rotatably by a drive source via a speed reduction unit. A first grinding mill and a second grinding mill provided between the upper mill and the hopper, and the rotary milling blade of the second mill is driven coaxially with the lower mill. In the electric grinding machine, the second mortar includes means for adjusting a distance between the fixed coarse grinding blade and the rotary coarse grinding blade.   2. The electric powder according to claim 1, wherein the means for adjusting the interval between the fixed coarse grinding blade and the rotary coarse grinding blade comprises means for changing a vertical position of the rotary coarse grinding blade. Sawing machine.   The electric grinding machine according to claim 1 or 2, wherein the first grinding mill includes means for adjusting a distance between the upper millstone and the lower millstone.

Images