JP2008238024A - Grain milling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized and light-weight grain milling apparatus suitable for domestic use. <P>SOLUTION: The grain milling apparatus has a lower mill 8 having a lower-side grinding surface 8a which is convex and tapered and has first grooves V<SB>1</SB>in the direction of the outer periphery from the central part and rotation-driven and a fixed upper mill 6 having an upper grinding surface 6d which is concave and tapered and has second grooves V<SB>2</SB>in the direction of the outer periphery from the central part and a through hole 6c for dropping of grains along the central axis. The lower edge of a bearing housing 12 is an oblique open surface 12a joined with the wedged surface 3a of a wedge block 3 so as to adjust the opposition gap between the lower grinding surface 8a and the upper grinding surface 6c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grain milling apparatus for milling grains such as buckwheat, rice, and beans, and more particularly to a grain milling apparatus suitable for home use.

Conventionally, as this kind of milling apparatus, as disclosed in JP-A-2001-137728, a vertical hole provided with a fixed lower die and a rotating upper die, which is eccentric from the rotation center of the upper die. The buckwheat grains are dropped and guided to the tapered rubbed surfaces of the upper and lower mortars and pulverized, and the buckwheat flour tapers along the grooves formed radially outward from the center of the tapered rubbed surfaces. It is sent out to the outer periphery of the rubbing surface.
JP 2001-137728 A (FIGS. 1 and 2)

  In the above milling apparatus, since the upper and lower mills are heavy with a stone mill, it is not necessary to manage the opposing gaps on the tapered rubbing surface, but this increases the weight and size, and is unsuitable as a home milling machine. It has a form.

  Then, in view of the said problem, the subject of this invention is providing the grain milling apparatus suitable for household use which can be reduced in weight and size.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a lower drive surface having a lower crushing surface having a convex shape that is convex upward and having a first groove from the center side toward the outer circumferential direction. A die, a concave taper on the top, a second groove extending from the center side toward the outer periphery, an upper grinding surface facing the lower grinding surface, and a grain dropping hole along the central axis It is characterized by comprising a fixed upper die and opposing gap adjusting means for adjusting the opposing gap between the lower grinding surface and the upper grinding surface by moving the lower die up and down along the central axis.

  For example, when crushing unshelled grains, the particle size is large, so the opposing gap adjustment means is operated, the lower mill is lowered and the opposing gap between the lower grinding surface and the upper grinding surface is set large, then the lower milling When the grain is put into the drop-through hole by rotationally driving the coarse powder, the coarse powder is drawn along the first groove while the grain is drawn into the rotating lower grinding surface and pulverized between the upper grinding surface To the outer periphery. Next, the opposing gap adjusting means is operated, the lower mill is raised to set the opposing gap between the lower pulverized surface and the upper pulverized surface small, and then the coarse powder is dropped into the grain and put into the through hole. Thus, a fine powder can be obtained this time. In addition, it is possible to mill even grains having greatly different particle sizes such as rice grains and bean grains.

  As described above, in the present invention, since the opposed gap adjusting means is provided with the lower mill as the rotary mill, the size and weight of the milling apparatus can be reduced, and the home milling apparatus can be provided. Moreover, since the lower die is a rotary die, the drive transmission mechanism from the electric motor arranged on the lower side of the lower die can be simplified.

  The invention according to claim 2 includes a lower die which is rotationally driven with a lower crushing surface having a first groove from the center side toward the outer peripheral direction in a tapered shape upward, and a concave shape on the upper side. An upper mill fixed in a tapered shape and having a second groove from the center side toward the outer circumferential direction and having an upper grinding surface facing the lower grinding surface and a grain dropping through hole along the central axis, And a damming portion that is fitted on the outer peripheral surface of the lower die and closes the groove on the outer peripheral side of the first groove.

  Since the powder guided from the center side to the outer peripheral side in the first groove on the lower pulverized surface is dammed by the damming portion, the pulverized space sandwiched between the lower pulverized surface and the upper pulverized surface A pressing force is applied to the powder, and the powder does not flow out to the outer peripheral side while being coarse, so that the pulverization performance is improved.

  The invention according to claim 3 includes a lower die which is rotationally driven with a lower crushing surface having a first groove from the center side toward the outer circumferential direction in a tapered shape upward, and a concave shape on the upper side. An upper mill fixed in a tapered shape and having a second groove from the center side toward the outer circumferential direction and having an upper grinding surface facing the lower grinding surface and a grain dropping through hole along the central axis, A pre-grinding body that rotates integrally with the lower millstone at the top of the lower mill, and has oblique external teeth that are steeper than the taper of the lower grinding surface, and is fixed to the upper side of the pre-grinding body A feed roll that pushes down the grains put into the drop-through hole, and that the wall of the drop-through hole is formed with inclined internal teeth spaced apart from the inclined external teeth. Features.

  When the grain is dropped directly onto the lower pulverized surface through the grain dropping hole, it is likely to clog the grain on the center side of the lower pulverized surface, but as described above, forced by the feed roll , And the pre-grinding part of the pre-ground body and the inclined external teeth can prevent clogging of grains and improve the grinding performance.

  It is desirable that the inclination of the inclined internal teeth is steeper than the inclination of the inclined external teeth. The interval between the inclined teeth and the inclined teeth can be gradually narrowed as it goes downward in the axial direction, and the clogging of the grains can be further prevented.

  According to the present invention, since the opposing gap adjusting means is provided with the lower mill as the rotary mill, the size and weight of the milling apparatus can be reduced, and the home milling apparatus can be provided. Moreover, since the lower die is a rotary die, the drive transmission mechanism from the electric motor is simplified on the lower side of the lower die.

  Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is an external perspective view showing a home flour milling apparatus according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a flour milling body of the home milling apparatus, FIG. 3 is an exploded perspective view of the flour milling body, FIG. Is a partially cutaway perspective view of the milling body, FIG. 5 is a perspective view showing a lower mill assembly of the milling body, FIG. 6 is a plan view showing a pre-ground body used in the milling body, and FIG. The perspective view which looked at the upper die from the bottom face side, FIG. 8 is an arrow view which shows the state cut | disconnected by the AA 'line in FIG. 2, FIG. 9 is the state cut | disconnected by the BB' line in FIG. FIG. 10 is a partial sectional view showing an outer peripheral side portion of the lower mortar assembly.

  As shown in FIG. 1 with the lower casing removed, the milling apparatus of this example includes a gear box 2 attached integrally with the electric motor 1 and a wedge block that slides on the box so as to be laterally movable. 3 and a milling body 4 supported on the wedge block. The milling body 4 includes a lower mill assembly 5 and an upper mill 6, and the lower mill assembly 5 includes a base 7, a lower mill 8, a weir rim 9, a pre-grinding body 10, and a feed roll 11.

  The base 7 has an annular wall 7c from the boss portion 7a through the end plate portion 7b and a dust drop opening 7d opened to the annular wall 7c side of the end plate portion 7b, and is fixed to the device fixing portion. A bearing housing 12 that can be displaced in the thrust direction is inserted through the portion 7a. The bearing housing 12 has a shaft portion 13 having a shaft coupling 13 a at the lower end portion, and the lower end of the bearing housing 12 is an inclined surface 12 a that is joined to the wedge surface 3 a of the wedge block 3.

The lower mortar 8 is a metal umbrella shape having a lower crushing surface 8a having a _first convex shape V1 with an upward convex taper shape from the center side toward the outer circumferential direction, and a shaft portion on the central surface 8b. It has a shaft hole 8c through which 13 is inserted and a planting pin P. A weir rim 9 is fitted on the outer peripheral surface of the lower die 8 and is screwed with a set screw 9a. As shown in FIG. 10, the inner peripheral surface 9b of the damming rim 9, it closes the first outer peripheral side of Mizoguchi Q of groove line V _1.

Pre grinding bodies 10 integrally has a plurality of helical teeth-like external teeth G on the lower side of the cylindrical portion 10a, the helical-like external teeth G, as shown in FIG. 8 or FIG. 9, the circumscribed circle C ₁ or in a leading edge step surface S ₂ of the rotating direction of the arcuate surface S ₁ on the border passing through the C ₂ consist edge slope surface S ₃ Metropolitan after anti rotational direction, and the front edge step surface S ₂ and the rear edge slope surface S ₃ An outer longitudinal groove W is formed. The inclination of the inclined tooth G is steeper than the taper of the lower grinding surface 8a. This pre-ground body 10 is inserted into the planting pin P on the central surface 8b of the lower mill 8 and is prevented from rotating. The feed roll 11 has a hollow portion 11a that fits around the cylindrical portion 10a of the front pulverized body 10, a left screw lead screw groove 11b on the outer peripheral surface, and radially outward from the cylindrical portion 10a of the front pulverized body 10. And a notch K that is hooked on the projecting detent pin p. In addition, the pre-grinding body 10, the lower mill 8 and the base 7 are assembled by screwing the fastening bolt 10b into the screw hole 13a of the shaft portion 13 through the inside of the cylindrical portion 10a.

The upper die 6 includes an umbrella-shaped portion 6a and a multi-step tapered central tube portion 6b extending upward from the central portion thereof. The bottom surface of the umbrella-shaped portion 6a is an upper grinding surface 6d having a concave taper shape and having a _second groove V2 from the center side toward the outer circumferential direction, and covers the upper grinding surface 8a of the lower die 8. ing. The outer peripheral side of the umbrella-shaped portion 6 a is prevented from rotating by a rotation-preventing pin 7 e of the annular wall 7 c of the base 7. The hollow of the central pipe portion 6b is a grain drop through hole 6c. Helical shaped internal teeth g away opposite the helical shape external teeth G is formed in a portion to contact the second center side of the groove line V ₂ of the hole wall of the drop lump hole 6c. As shown in FIG. 8 or FIG. 9, the inclined internal teeth g have a stepped surface S ₂ ′ and a gradient surface S in the rotational direction at the circular arc surface S ₁ ′ passing through the inscribed circle C ₁ ′ or C ₂ ′. ₃ ′, and the step surface S ₂ ′ and the gradient surface S ₃ form an inner longitudinal groove W ′. The inclination of the inclined internal teeth g is steeper than the inclination of the inclined external teeth G.

  Here, the wedge surface 3a of the wedge block 3 and the inclined surface 12a of the lower die assembly 5 constitute an opposing gap adjusting mechanism. When the wedge block 3 is operated and moved laterally, the bearing housing 12 moves up and down. The lower die assembly 5 is also followed. For this reason, the opposing gap between the lower grinding surface 8a of the lower mill 8 and the upper grinding surface 6d of the upper mill 6 can be adjusted. In addition, since the load of the lower mill assembly 5 is received not by the shaft portion 12 but by the wedge surface 3a of the wedge block 3, the area ratio of the lower grinding surface 8a can be improved by reducing the diameter of the shaft portion 12.

For example, when crushing buckwheat peel, the particle size is large, so after operating the wedge block 3 and lowering the lower mill assembly 5 to set the opposing gap between the lower grinding surface 8a and the upper grinding surface 6d large, When the lower mill 8 is rotationally driven and the seeds are put into the grain dropping through-holes 6c, the seeds are drawn into the rotating lower grinding surface 8c and are crushed between the upper grinding surface 6d and coarse powder. There is fed to the outer peripheral direction along the first groove line V _1. Next, after raising the lower mill 8 and setting the facing gap between the lower grinding surface 8a and the upper grinding surface 6d to be small, the coarse powder is dropped into the grain hole 6c, and this time, Fine powder can be obtained. Moreover, since the opposing gap can be adjusted even for rice grains and bean grains having different particle sizes, fine powder can be produced.

  Thus, in this example, since the opposing gap adjusting means is provided using the lower mill 8 as a rotary mill, the milling apparatus can be reduced in size and weight, and a home milling apparatus can be provided. Moreover, since the lower mill 8 is a rotary mill, the drive transmission mechanism from the electric motor 1 arrange | positioned under the lower mill 8 can be simplified.

Further in this example, since the first blocking rim 9 closing the outer circumferential side of Mizoguchi Q of groove line V ₁ are fitted on the outer circumferential surface of the lower die 8 is attached, as shown in FIG. 10, the The powder M guided from the center side to the outer periphery side in the groove V _{1 of 1} is dammed by the dam 9 and temporarily stagnated, so that it is sandwiched between the lower pulverized surface 8a and the upper pulverized surface 6d. A pressing force is applied to the pulverized space, so that the powder does not flow out to the outer peripheral side while being coarse, and the pulverization performance is improved. In particular, since the grain to be boosted at the leading edge step surface S ₂ of the helical teeth-like external teeth G is hit the step surface S ₂ of the helical teeth like the teeth g, a large effect of crushing the grains.

  In this example, the pre-grinding body 10 that rotates integrally with the lower mill 8 at the top of the lower mill 8 and has the inclined external teeth G that are steeper than the taper of the lower grinding surface 8a, Since the feed roll 11 fixed to the upper side of the pulverized body 10 is provided, clogging is hardly caused on the center side of the lower pulverized surface 8a, and the pulverization performance is improved. In addition, since the interval between the inclined internal teeth g and the inclined external teeth G becomes gradually narrower as it goes downward in the axial direction, clogging of the grains can be further prevented.

It is an external appearance perspective view which shows the domestic milling apparatus which concerns on the Example of this invention. It is a longitudinal cross-sectional view which shows the milling main body of the flour mill for home use. It is a disassembled perspective view of the flour-making body. It is a partially cutaway perspective view of the milling body. It is a perspective view which shows the lower mortar assembly of the said flour main body. It is a top view which shows the pre-grinding body used for the lower mortar assembly. It is the perspective view which looked at the upper mill of the flour main body from the bottom face side. It is an arrow line view which shows the state cut | disconnected by the AA 'line | wire in FIG. It is an arrow line view which shows the state cut | disconnected by the BB 'line | wire in FIG. It is a fragmentary sectional view showing the perimeter side portion of the lower mill assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric motor 2 ... Gear box 3 ... Wedge block 3a ... Wedge surface 4 ... Milling main body 5 ... Lower mill assembly 5
6 ... Upper mill 6a ... Umbrella-shaped part 6b ... Central pipe part 6c ... Grain drop through-hole 6d ... Upper grinding surface 7 ... Base 7a ... Boss part 7b ... End plate part 7c ... Annular wall 7d ... Powder dropping port 7e, p ... detent pin 8 ... lower mill 8a ... lower grinding surface 8b ... center surface 8c ... shaft hole 9 ... weir rim 9a ... set screw 9b ... inner peripheral surface 10 ... pre-grinding body 10a ... cylinder 10b ... tightening Bolt 11 ... Feed roll 11a ... Hollow part 11b ... Lead screw groove 12 ... Bearing housing 12a ... Slope port surface 13 ... Shaft part 13a ... Shaft coupling 13b ... Screw hole G ... Inclined external teeth g ... Inclined internal teeth C _1, C 2 _... circumscribed circle _C 1 ', _{C 2'} ... inscribed circle K ... cutout M ... powder P ... planting pins Q ... Mizoguchi _{S 1, S} 1 '... arcuate surface _{S 2} ... leading step surface S 3 _... trailing slope surface _{S 2} '... step surface _{S 3'} ... inclined face _{V 1} ... first groove line _{V 2} ... second groove line W ... outer longitudinal groove '... Uchitatemizo

Claims (4)

A lower mill having a lower grinding surface having a first groove extending from the center side toward the outer peripheral direction from the center side to the outer circumferential direction, and a lower die rotated rotationally from the center side toward the outer circumferential direction. An upper mill having a second groove toward the upper grinding surface facing the lower grinding surface and a grain dropping through hole along the central axis, and fixing the lower mill to the central axis A grain milling apparatus, comprising: an opposing gap adjusting means that moves up and down along the line to adjust an opposing gap between the lower pulverized surface and the upper pulverized surface. A lower mill having a lower grinding surface having a first groove extending from the center side toward the outer peripheral direction from the center side to the outer circumferential direction, and a lower die rotated rotationally from the center side toward the outer circumferential direction. An upper mill face having a second groove and facing the lower grinding face and an upper mill face fixed with a grain dropping through hole along the central axis, and an outer peripheral face of the lower mill face A grain milling apparatus comprising a damming portion that is externally fitted to close a groove opening on the outer peripheral side of the first groove. A lower mill having a lower grinding surface having a first groove extending from the center side toward the outer peripheral direction from the center side to the outer circumferential direction, and a lower die rotated rotationally from the center side toward the outer circumferential direction. An upper mill having a second groove toward the upper grinding surface facing the lower grinding surface and a grain dropping through hole along the central axis, and at the top of the lower mill A pre-grinding body that rotates integrally with a lower mill and has oblique external teeth that are steeply inclined than the taper of the lower grinding surface, and the drop-through hole fixed to the upper side of the pre-grinding body A feed roll that pushes down the grains to be fed into the hole, and a wall of the drop-through hole is formed with inclined internal teeth spaced apart and opposed to the inclined external teeth. Grain milling equipment. 4. The grain milling apparatus according to claim 3, wherein the inclination of the inclined internal teeth is steeper than the inclination of the inclined external teeth.

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