阅读说明：本技术 磨式研磨机 (Grinding type grinder ) 是由 尹壬奎 于 2018-01-03 设计创作，主要内容包括：本发明的磨式研磨机,包括：研磨组装体,由上部研磨部和下部研磨部形成,上部研磨部形成为下表面形成有向上侧凹陷的容纳槽的盖形状,在容纳槽内表面具备具有凹凸的第一研磨面,下部研磨部形成为与上部研磨部的第一研磨面对应的形状,且具备插入容纳槽内的凹凸的第二研磨面；上部本体,在上部本体上固定上部研磨部,且上部本体上具备投料口,以能够向投料孔内投入研磨对象；以及下部本体,在下部本体上固定下部研磨部,且下部本体能够旋转地支撑上部本体。(The present invention provides a grinder, comprising: a polishing assembly formed of an upper polishing part and a lower polishing part, wherein the upper polishing part is formed in a cover shape having a receiving groove recessed to an upper side formed on a lower surface thereof, a first polishing surface having irregularities is formed on an inner surface of the receiving groove, and the lower polishing part is formed in a shape corresponding to the first polishing surface of the upper polishing part and has a second polishing surface having irregularities inserted into the receiving groove; an upper body to which an upper polishing section is fixed, the upper body having a feed port through which a polishing target can be fed into the feed hole; and a lower body to which the lower polishing part is fixed and which rotatably supports the upper body.)

1. A grinder, comprising: a polishing assembly including an upper polishing part formed in a cover shape having a receiving groove recessed upward on a lower surface thereof, and a lower polishing part formed in a first polishing surface having a concave and convex inner surface thereof, the first polishing surface having a circular upper surface portion and a peripheral portion extending downward from an edge curve of the upper surface portion, the upper polishing part having a feed hole through which an object to be polished is fed, the lower polishing part having a shape corresponding to the first polishing surface of the upper polishing part and a concave and convex second polishing surface inserted into the receiving groove; an upper body to which the upper polishing unit is fixed, the upper body having a feed port through which a polishing target can be fed into the feed hole; and a lower body to which the lower polishing part is fixed and which rotatably supports the upper body.

2. The grinder of claim 1, wherein an upper surface portion of the lower grinding part is formed with a gradient in which a periphery of a central portion is low and gradually rises toward an outer side.

3. The grinder of claim 1, wherein the irregularities are formed on the first and second grinding surfaces by a grinding projection formed by a plurality of grinding projections projecting between a groove portion and the groove portion, a plurality of second grooves in the form of concentric circles having different radii are formed on an upper surface portion of the second grinding surface, and a projection piece is included on the first grinding surface, the projection piece extending in an elongated projection into the second groove at a position corresponding to the second groove of the second grinding surface, so that the upper grinding portion conveys the ground material while rotating along the second groove of the second grinding surface.

4. The grinder of claim 1, wherein an outer flange extending outward is provided at a lower end edge of the lower grinding part, an upper surface of the outer flange is concavely formed to be able to receive the ground material, and a discharge hole is formed to discharge the ground material toward a lower portion, and a sweeping protrusion for guiding the ground material remaining on the outer flange to the discharge hole is formed at a lower surface of the upper grinding part corresponding to an upper surface of the outer flange of the lower grinding part.

5. The grinder of claim 1, comprising: a connecting shaft member inserted through the cavity from the upper surface of the upper body, extending through the center of the upper polishing section, and having a lower end fixed to the lower polishing section; and a compression spring provided in the upper body to elastically support the upper polishing section and to press the upper polishing section, thereby providing a surface pressure between the first polishing surface and the second polishing surface to polish the object to be polished.

6. The grinder of claim 5, wherein a shaft portion is formed on the upper body, the shaft portion being formed with a cavity in which the connecting shaft member extends, a spring installation groove for installing the compression spring along the cavity being formed in the shaft portion, the compression spring being pressed by an upper end of the connecting shaft member and pressurized downward in the spring installation groove, the pressurized force of the compression spring being transmitted to an upper surface of the upper grinding portion.

7. The grinder of claim 6, wherein the upper grinding part is disposed at a setting groove portion formed toward a lower surface of the upper body, an upper surface of the upper grinding part is supported by the setting groove portion, and the pressing force of the compression spring transmitted through the shaft portion is transmitted to the upper grinding part through the setting groove portion.

8. The grinder of claim 6, wherein the connecting shaft member is fastened to the lower grinding part with a fastening depth adjustable, and an adjustment knob is provided at an upper end of the connecting shaft member, and the elastic force applied to the upper grinding part by the compression spring provided in the spring installation groove is adjusted by changing the fastening depth of the connecting shaft member to the lower grinding part by rotating the adjustment knob.

9. The grinder of claim 8, wherein a nut groove is formed at a lower central portion extending toward a lower portion of the lower grinding part, a nut-shaped member is inserted and fixed into the nut groove, and the connecting shaft member is fastened to the nut-shaped member.

Technical Field

The present invention relates to a grinder, and more particularly, to a grinder for grinding and grinding grains such as wheat, red beans, soybeans, and mung beans, coffee, tea leaves, and the like.

Background

For grinding grains such as wheat, red beans, soybeans, mung beans, coffee, tea leaves, etc., a grinder is generally used. As the most conventional form of the grinder, there is known a korean conventional grinder, in which two stones, i.e., an upper stone block and a lower stone block, which are circular and vertically matched, are abutted against each other, and after grains or the like are pushed in from a feed opening, the grains are ground while rotating the upper stone block.

When the dog-house of limit through last stone drops into cereal limit and rotates last stone, cereal is ground at the part of two stone opposition butts between last stone and the lower stone, and the outside is pushed out by the cereal of grinding through the rotatory power of last stone, and the cereal of grinding that is pushed out can the landing place in the basin of stone mill.

It is known that, in the stone mill, the grinding object is ground by the weight of the upper stone and the frictional force of the grinding surface between the upper stone and the lower stone, and the inherent taste of the grinding object can be maintained well without destroying the nutrients of grains as compared with the blade grinding method.

However, such stone mills are constructed of stone materials and thus are very heavy, having the disadvantage of being difficult to handle and use. In addition, the ground grains are stuck to the outer surface of the lower stone block when sliding off, and the lower stone block is not easy to clean due to its very heavy weight, and particularly has the defect that the opposite abutting part between the upper stone block and the lower stone block is not easy to clean.

Disclosure of Invention

Problems to be solved by the invention

The invention aims to provide a grinding type grinder which is lighter than a known stone grinder formed by stone, is convenient to operate and use, can effectively grind a grinding object, is easy to clean and can keep sanitation and cleanness.

The invention aims to provide a grinding type grinder which can effectively perform wet grinding for grinding a water-containing grinding object and dry grinding for grinding the dried grinding object.

Means for solving the problems

The grinding mill of an embodiment of the present invention comprises: a polishing assembly including an upper polishing portion formed in a cover shape having a receiving groove recessed upward on a lower surface thereof, the receiving groove having a first polishing surface with projections and recesses on an inner surface thereof, and a lower polishing portion formed in a shape corresponding to the first polishing surface of the upper polishing portion and having a second polishing surface with projections and recesses inserted into the receiving groove; an upper body to which the upper polishing unit is fixed, the upper body having a feed port through which a polishing target can be fed into the feed hole; and a lower body to which the lower polishing part is fixed and which rotatably supports the upper body.

The first polishing surface is formed to have a circular upper surface portion and a peripheral portion extending downward from the edge curve of the upper surface portion, and is formed in a shape corresponding to the first polishing surface, and irregularities are formed on the first polishing surface and the second polishing surface, so that a polishing space is formed between the first polishing surface and the second polishing surface. Here, the upper surface portion of the second polishing surface of the lower polishing section has a gradient which is lower in the periphery of the central portion and gradually increases toward the outside.

According to an embodiment of the invention, comprising: a connecting shaft member inserted through the cavity from the upper surface of the upper body, extending through the center of the upper polishing section, and having a lower end fixed to the lower polishing section; and a compression spring provided in the upper body to elastically support the upper polishing section and to press the upper polishing section, thereby providing a surface pressure for polishing an object to be polished between the first polishing surface and the second polishing surface, wherein a shaft portion is formed in the upper body, a cavity into which the connecting shaft member extends is formed in the shaft portion, a spring installation groove for installing the compression spring along the cavity is formed in the shaft portion, the compression spring is pressed by an upper end of the connecting shaft member and pressed downward in the spring installation groove, and a pressing force of the compression spring is transmitted to an upper surface of the upper polishing section.

According to an embodiment of the present invention, the connecting shaft member is fastened to the lower polishing section with a fastening depth adjustable, and an adjustment knob is provided at an upper end of the connecting shaft member, and the fastening depth of the connecting shaft member to the lower polishing section is changed by rotating the adjustment knob, thereby adjusting an elastic force applied to the upper polishing section by the compression spring provided in the spring installation groove.

According to the present invention, the first polishing surface and the second polishing surface are formed with irregularities by a polishing pad portion formed by a plurality of polishing pads protruding between a groove portion and the groove portion, the second polishing surface is formed with a plurality of first grooves extending spirally from a center portion toward an outer side, the second polishing surface is formed with a plurality of concentric second grooves having different radii in an upper surface portion thereof, the second grooves are formed to intersect with the first grooves, a protruding piece extending and protruding into the second groove is provided at a position of the first polishing surface corresponding to the second grooves of the second polishing surface, and the protruding piece conveys a polished article while rotating along the second grooves of the second polishing surface when the upper polishing portion rotates.

According to an embodiment of the present invention, an outer flange extending outward is provided at a lower end edge of the lower polishing section, an upper surface of the outer flange is concavely formed to be able to receive polishing objects, and a discharge hole is formed to discharge the polishing objects to a lower portion, and a sweeping protrusion for guiding the polishing objects remaining on the outer flange to the discharge hole is formed at a lower surface of the upper polishing section corresponding to an upper surface of the outer flange of the lower polishing section.

ADVANTAGEOUS EFFECTS OF INVENTION

The grinder of the present invention constructed as described above is lightweight and convenient to operate and use, compared to a known stone grinder formed of stone. Further, since the grinding is performed by crushing the object to be ground while pressing the working surface in the grinding space between the upper grinding part and the lower grinding part, as in the case of the known stone grinder, it has an effect of maintaining the original taste of the object to be ground while minimizing the destruction of nutrients, as in the case of the known stone grinder.

According to the polishing machine of the present invention, since the surface pressure of the polishing surface can be adjusted according to the size and type of the object to be polished, the object to be polished can be more efficiently pulverized.

According to the present invention, the upper body and the lower body can be assembled and separated from each other by the tightness of the connecting shaft member, and thus, there is an advantage in that the assembling property is excellent and the separation for cleaning and washing is easily performed. Since the abrasive grains can be easily removed for cleaning or washing after use, even if one abrasive grinder is used to grind various objects to be ground, the residual abrasive grains can be prevented from being mixed with new abrasive grains, and the abrasive grains can be kept from remaining inside by cleaning or/and washing, thereby providing an advantage of sanitary use.

According to the invention, the pull-out type storage barrel is arranged, so that the grinding objects can be easily stored.

According to the present invention, the upper polishing section and the lower polishing section can be formed by molding a ceramic material, so that molding is easy and can be made small, and sanitary use can be achieved by the antibacterial effect of the material.

According to the present invention, compared with the existing stone mill made of stone, the stone mill is lighter in weight, and therefore, is easy to handle and carry.

Drawings

Fig. 1 is a perspective view showing an external form of a grinder according to an embodiment of the present invention.

Fig. 2 and 3 are sectional views of a grinder according to an embodiment of the present invention.

Fig. 4 to 8 are views showing an upper polishing section of a grinder according to an embodiment of the present invention, fig. 4 and 5 are perspective views of the upper polishing section as viewed from above and below, respectively, and fig. 6 to 8 are a plan view, a bottom view, and a side view of the upper polishing section, respectively.

Fig. 9 to 13 are views showing a lower polishing section of a grinder according to an embodiment of the present invention, fig. 9 and 10 are perspective views of the lower polishing section as viewed from above and below, respectively, and fig. 11 to 13 are a plan view, a bottom view, and a side view of the lower polishing section, respectively.

Detailed Description

Hereinafter, a grinder according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 to 3, the grinder of the present invention includes an upper body 100, a grinding assembly 200, and a lower body 300.

The upper surface 110 of the upper body 100 is provided with an open feed opening 120. The feed port 120 is a path through which the polishing target is fed. A handle 130 for rotating the upper body 100 is provided at one side of the upper body 100.

The upper body 100 is formed with a groove 140, and an upper polishing portion 220 constituting an upper portion of the polishing assembly 200 is provided inside the groove 140. The upper polishing portion 220 is disposed and fixed inside the installation groove 140. The upper surface of the upper polishing unit 220 is supported by the groove 140.

The polishing assembly 200 includes an upper polishing portion 220 and a lower polishing portion 230.

The upper polishing unit 220 is fixed to the upper body 100 and is provided to rotate with the upper body 100. The lower polishing unit 230 is coupled to the lower body 300 and does not rotate together with the lower body 300 when the upper body 100 rotates.

The lower body 300 is positioned at a lower portion of the upper body 100, rotatably supporting the upper body 100. The lower polishing part 230 is fixedly supported on the upper surface of the lower body 300.

A receiving tub 500 is detachably provided in the lower body 300, and the receiving tub 500 receives the polishing material polished by the polishing assembly 200.

The upper body 100 includes a shaft portion 210 at the center thereof, the connecting shaft member 400 penetrates the shaft portion 210 in the longitudinal direction, and the shaft portion 210 is formed with a cavity 211 along the longitudinal direction, that is, the longitudinal direction of the connecting shaft member 400 so that the connecting shaft member 400 can penetrate therethrough.

The coupling shaft member 400 is provided to penetrate through the cavity 211 formed in the shaft portion 210. The coupling shaft member 400 is provided along the cavity 211 formed in the shaft portion 210 from the upper surface 100 of the upper body 100, penetrates through the center of the upper polishing portion 220, extends downward, and has a lower end fastened and fixed to the lower polishing portion 230. Therefore, a cavity 211, which is an insertion path of the coupling shaft member 400, is formed to penetrate the shaft portion 210 and the center portion of the upper polishing portion 220, and extends to the center portion of the lower polishing portion 230.

The upper end of the connecting shaft member 400 is provided with an adjustment knob 420, which enables the rotation adjustment of the connecting shaft member 400. The adjustment handle 420 is located on the upper surface 110 of the upper body 100 and is formed to be rotatable by a user's hand.

The connection shaft member 400 is provided to elastically press the upper polishing portion 220 toward the lower polishing portion 230. As shown in fig. 2 and 3, the spring installation groove 212 is formed along a path through which the connection shaft member 400 passes, i.e., the cavity 211 formed at the shaft portion 210. The spring installation groove 212 is formed with an inner diameter larger than that of the cavity 211, thereby forming a stepped portion 212a capable of supporting the lower end of the compression spring 410 with the lower end. A compression spring 410 is provided inside the spring installation groove 212. The compression spring 410 is disposed between the stepped portion 212a constituting the lower end of the spring installation groove 212 and the adjustment knob 420. Therefore, when the connecting shaft member 400 is adjusted in the vertical direction by rotating the adjustment knob 420, the elastic force applied to the upper polishing portion 220 by the compression spring 410 can be adjusted.

Since the connection shaft member 400 is elastically supported by the compression spring 410 when it is provided to penetrate, the elastic force acting on the connection shaft member 400 is transmitted to the provision groove portion 140 that supports the upper surface of the upper polishing portion 220 by the shaft portion 210, and the upper polishing portion 220 is pressurized by the provision groove portion 140. By the provision of the groove part 140 supporting the upper surface of the upper polishing part 220, the pressing force of the compression spring 410 is transmitted to the upper polishing part 220, and thus the pressing force can be uniformly applied to the upper polishing part 220.

According to an embodiment of the present invention, the upper body 100 and the lower body 300 are manufactured by injection molding of a plastic material.

Fig. 4 to 8 show an upper grinding part of the grinder of the present invention, and fig. 9 to 13 show a lower grinding part of the grinder of the present invention.

Referring to fig. 1 to 13, the polishing assembly 200 includes an upper polishing unit 220 and a lower polishing unit 230 that perform a polishing operation of a polishing object.

The upper grinding part 220 and the lower grinding part 230 are advantageously made by injection moulding of a ceramic material. The ceramic material is lighter and harder than stone of known stone grinding materials. In addition, the antibacterial material has the advantage of realizing sanitary use through the antibacterial effect of the material. However, the polishing assembly 200 is not limited to a ceramic material, and a plastic material having high hardness may be used. In recent years, plastic materials having high hardness have been developed due to the development of plastic-related material technology, and the upper polishing portion 220 and the lower polishing portion 230 can be manufactured by injection molding of plastic materials as needed.

According to the present invention, the upper polishing portion 220 and the lower polishing portion 230 can be manufactured by injection molding, and thus, the manufacturing is easy.

According to the present invention, the upper polishing unit 220 is formed in a shape similar to a cap shape recessed toward the lower portion, thereby increasing the area of the polishing surface and realizing light weight production.

A recessed receiving groove 224 is formed at a lower portion of the upper polishing portion 220, and an inner surface of the receiving groove 224 is formed to have a circular upper surface portion and a peripheral portion curvedly connected to extend downward from an edge of the circular upper surface portion. The accommodation groove 224 is formed such that the diameter of the upper surface portion is larger than the height of the peripheral portion, and has a cover shape expanding outward.

The receiving groove 224 has an inner surface formed with a concave-convex shape to form a first polishing surface 221 and to receive an upper portion of the lower polishing portion 230, i.e., a second polishing surface 231.

A cavity 211 through which the connection shaft member 400 passes is formed at the center of the upper polishing unit 220, and a feed hole 222 communicating with the feed port 120 of the upper body 100 is formed at the upper surface of the periphery of the cavity 211.

Along the rotation path of the feed hole 222 of the upper polishing unit 220, a feed space 223 is formed in the housing groove 224 so as to be recessed upward. The charging space part 223 does not form a polishing surface corresponding to the upper surface of the lower polishing part 230 in a state where the upper polishing part 220 and the lower polishing part 230 are assembled with each other, and forms a relatively wide partitioned space. The charging space 223 is a space for guiding the polishing target charged through the charging hole 222 to the space between the first polishing surface 221 and the second polishing surface 231 so that the polishing target can be charged into the polishing assembly 200.

The feeding space 223 is formed along the rotational path of the feeding hole 222 toward at least one side of the feeding hole 222, and is formed to the rear side of the rotational direction of the feeding hole 222 in accordance with the set rotational path of the upper polishing unit 220. When the upper polishing unit 220 rotates in the direction opposite to the direction in which the charge space portion 223 extends, the polishing object is likely to enter the direction of the first polishing surface 221 and the second polishing surface 231 while being trapped in the charge space portion 223.

The lower polishing unit 230 includes an upper portion corresponding to the receiving groove 224 of the upper polishing unit 220, and a second polishing surface 231 corresponding to the first polishing surface 221 of the upper polishing unit 220 is formed by forming a concave-convex portion on the upper portion of the lower polishing unit 230. The upper surface of the lower polishing portion 230 forms a polishing surface to be inserted into the housing groove 224, and thus has a shape corresponding to the housing groove 224. Therefore, the upper surface portion is formed in a circular shape having the lower polishing portion 230, and the peripheral portion is formed to extend downward from the edge curve connection of the upper surface portion formed in a circular shape.

The first polishing surface 221 and the second polishing surface 231 are formed with irregularities capable of polishing an object to be polished, and polish the object to be polished by cooperation with each other.

A shaft groove portion 225, which is a cylindrical groove having a diameter larger than that of the cavity 211, is formed on the central lower surface of the upper polishing portion 220. A support shaft 232 into which the shaft groove portion 225 is rotatably inserted is formed at the center of the upper surface of the lower polishing portion 230 corresponding to the shaft groove portion 225. The support shaft 232 is inserted into the shaft groove portion 225, whereby the upper polishing portion 220 and the lower polishing portion 230 are assembled with each other, so that the upper polishing portion 220 can be more stably rotatably supported with respect to the lower polishing portion 230.

A groove 233 is formed on the lower surface of the lower polishing part 230. The concave groove 233 is formed recessed around the center portion of the lower polishing section 230, and the concave groove 233 of the lower polishing section 230 can reduce the weight of the lower polishing section 230, thereby functioning to make the polishing machine of the present invention lighter.

A shaft fixing portion to which the lower end of the connection shaft member 400 is fixed is formed at the center portion of the lower polishing portion 230. A lower center portion 234 of the lower polishing portion 230 extends downward corresponding to the height of the lower surface of the lower polishing portion 230 and forms a nut groove 235, and the nut groove 235 is connected to the cavity 211 formed at the center of the support shaft 232. A shaft fixing portion into which the nut-shaped member 236 shown in fig. 10 is inserted to be fastened and fixed to the lower end of the shaft member 400 is formed in the nut groove 235. Since the snap-in portion is formed on the peripheral surface of the nut-shaped member 236 and the nut groove 235 has a shape corresponding to the nut-shaped member 236, the nut-shaped member 236 can be fixed while being prevented from rotating in the nut groove 235.

The shaft fixing portion may be formed in other manners, for example, a nut-shaped member is inserted from the upper portion of the support shaft 223 to the cavity 211, so that the lower end of the connection shaft member 400 can be fixed. However, from the viewpoint of the pressing stability of the lower polishing portion 230 and the stability of the pressure applied during polishing, the lower center portion 234 of the lower polishing portion 230 is supported by the installation surface portion 310 by being formed at the height of the lower surface of the lower polishing portion 230, and the nut groove 235 is formed on the lower side of the lower center portion 234, which is more advantageous in the structure of fastening the nut member 236. The lower central portion 234 extending toward the lower surface of the lower polishing portion 230 prevents the upper surface of the lower polishing portion 230 from sagging downward during injection molding.

The object to be ground and the object to be ground flow between the first grinding surface 221 and the second grinding surface 231 and compression and grinding of the object to be ground are realized. The first polishing surface 221 and the second polishing surface 231 form a partitioned space between the two polishing surfaces suitable for polishing of a polishing object. The length of the support shaft 232 is formed to be slightly longer than the depth of the shaft groove portion 225 in order to form the partitioned space.

The space for polishing between the first and second polishing objects 221 and 231 can be adjusted by the connecting shaft member 400. The lower end of the connecting shaft member 400 is fastened and fixed to the lower polishing unit 230, and the upper polishing unit 220 is supported in the downward direction by the force of the compression spring 410 provided in the spring installation groove 212. Accordingly, as the adjustment knob 214 is gripped and the connection shaft member 400 is rotated, the fastening depth of the connection shaft member 400 to the lower polishing unit 230 is adjusted, and the degree of compression of the compression spring 410 provided in the spring installation groove 212 is changed, thereby adjusting the pressing force of the upper polishing unit 220 to be pressed downward.

Since the upper polishing unit 220 is not fixed to the lower polishing unit 230 but is pressed downward by elasticity, when a large-particle polishing object is thrown in, polishing is performed in a state where a space for polishing is large, and when a relatively small-particle polishing object is thrown in, polishing is performed in a state where a space for polishing is narrow. However, when the elastic force applied by the compression spring 410 is small, the range in which the upper polishing section 220 can flow upward when the polishing object is put into the inside becomes larger than when the elastic force is large. That is, the surface pressure applied to the polishing surface can be adjusted by adjusting the size of the polishing space by the compression spring 410.

The irregularities of the first polishing surface 221 of the upper polishing portion 220 and the second polishing surface 231 of the lower polishing portion 230 are formed by polishing a combination of the protrusions 240 and the grooves 250.

As shown in fig. 9 and 11, a plurality of first grooves 251 are formed in the second polishing surface 231 of the lower polishing portion 230 in a spiral shape in the outward direction from the support shaft 232. The first grooves 251 extend in a spiral form from the second abrasive surface 231 toward the peripheral portion through the upper surface portion. The upper surface portion of the first groove 251 intersects the second groove 252 and is continuous along the peripheral portion.

The groove intervals of the first grooves 251 of the second polishing surface 231 are alternately repeated in a circumferentially wide and narrow manner, and the spiral angle increases toward the outer edge of the second polishing surface 231, that is, toward the outer peripheral portion. The polishing performance is improved as the spiral angle of the first groove 251 is increased toward the outer edge of the second polishing surface 231. The first groove 251 formed in the second polishing surface 231 is formed to extend in a direction corresponding to the rotation direction of the upper polishing portion 220.

A plurality of concentric circle-shaped second grooves 252 having different diameters are formed in the upper surface portion of the second polishing surface 231 to form the support shaft 232 as a concentric circle center. Thereby, the first groove 251 and the second groove 252 intersect at the upper surface portion of the second abrasive surface 231.

The width of the second groove 252 formed near the support shaft 232 is formed to be relatively wider than another second groove 252 formed at the outer side. The second groove 252 serves as a rotation passage for the protruding piece 241 formed on the first polishing surface 221 of the upper polishing portion 220. That is, the projecting pieces 241 of the upper polishing portion 220, which will be described later, extend to function as scooping up the polishing material inside the second grooves 252 while rotating along the second grooves 252 of the second polishing surface 231.

A plurality of polishing protrusions are formed between the plurality of grooves 250 on the second polishing surface 231, thereby constituting polishing protrusions 240.

The grinding projections 240 are a collection of grinding projections formed between the plurality of groove portions 250 in a form extending in a spiral form from the support shaft 232 toward the outer side edge along the first groove 251.

The upper surface portion of the second polishing surface 231 of the lower polishing portion 230 may have a substantially planar configuration. However, as in the embodiment of the present invention, it may be more advantageous to form in a groove shape state having an inclination that is low at the center side forming the support shaft 232 side and gradually rises toward the outside. As the upper surface portion is formed in a groove state having an inclination, moisture from the grinding object can be held at the upper surface portion of the recess at the time of grinding. The recessed upper surface portion of the second polishing surface 231 allows moisture from the polishing material to remain without being directly discharged to the outside when polishing a wet-type polishing object having moisture, and provides a sufficient wet environment, thereby achieving polishing in a state in which the polishing material and the moisture are mixed. This causes the water to act as a lubricant on the object to be polished, thereby improving the polishing performance.

As shown in fig. 5 and 7, irregularities formed by the polishing protrusions 240 and the grooves 250 are formed on the remaining surface of the first polishing surface 22 of the upper polishing section 220, excluding the shaft grooves 225 and the charge space 223. That is, the polishing protrusion is formed between the groove portions by forming the groove portions by a first groove portion extending in a spiral direction from the central portion where the shaft groove portion 225 is formed in a circular portion and an outer peripheral portion and a plurality of second groove portions having different radii and having the central portion as a concentric center.

According to the present invention, the first abrasive surface 221 further comprises a projecting piece 241 projecting in a manner to extend into the second groove 252 of the second abrasive surface 231. That is, the projecting pieces 241 are formed to be longer than the other polishing projections of the first polishing surface 221, and extend into the second grooves 252 so as to be positioned between the polishing projections of the second polishing surface 231. The projecting piece 241 functions to scoop out the polishing material accumulated in the second groove 252 from the second groove 252 while moving along the second groove 252 of the second polishing groove 231 during polishing and to convey the polishing material to the peripheral portion. Thus, the abrasive does not get stuck or stagnated in the groove of the second abrasive 231, but is guided to the outside by the influence of the centrifugal force. Further, stagnation of the polishing material which may occur in the case where the upper surface portion of the second polishing surface has a concave inclination is eliminated, and the polishing efficiency is improved even in the wet polishing.

The protruding pieces 241 are formed at positions corresponding to the second grooves of the second polishing surface 231 and extend into the second grooves. Therefore, the distance of the projecting portion 241 is different from that of the polishing protrusion formed on the upper surface portion of the first polishing surface 221 with respect to the center portion where the shaft groove portion is formed. In addition, the polishing protrusions are formed to be longer than the remaining polishing protrusions formed on the first polishing surface 221. Each of the convex pieces 241 may be formed inclined toward the edge of the first abrasive surface 221 at an angle corresponding to the spiral angle.

Referring again to fig. 2 and 3, the upper body 100 and the upper abrasive part 220 are integrally coupled to each other by coupling means. The upper body 100 is rotatably disposed along the outer rail 320 of the lower body 300.

The outer guide rail part 320 is formed at the upper outer side of the lower body 300 so that the guide protrusion 150 formed at the upper body 100 can slide along the outer guide rail part 320, and thus the upper body 100 fixed with the upper polishing part 220 can be easily rotated on the lower body 300. In contrast, a guide protrusion may be formed at the lower body 300, and an outer guide rail portion may be formed at the upper body 100.

The coupling means may be a clamping member that can clamp and fix the upper body 100 and the upper polishing portion 220, but may be implemented by a fastening member such as a screw that can firmly and integrally fix the upper body and the upper polishing portion without separation.

As shown in fig. 4 to 12, according to the present invention, an outer flange 260 extending outward is provided at the edge of the upper polishing portion 220.

A coupling hole 261 is formed in the outer flange 260, and a corresponding coupling hole is formed in a corresponding surface of the upper body 100 corresponding to the coupling hole 261, so that fastening is performed using a fastening member as an intermediate medium.

The lower end edge of the lower polishing portion 230 is provided with an outer flange 270 extending outward. A coupling hole 271 is formed at the outer flange 270, and a corresponding coupling hole 272 corresponding to the coupling hole 271 is formed at the installation surface portion 310 formed at the upper surface of the lower body 300, so that the lower polishing portion 230 is fixed to the upper surface of the lower body 300 by a fastening member.

According to the present invention, the discharge hole 274 capable of discharging the polishing material toward the lower portion is formed through the outer flange 270 of the lower polishing unit 230, and the polishing material is discharged to the storage tub 500 disposed at the lower portion thereof through the discharge hole 274. It is preferable that the discharge holes 274 are formed in plurality at intervals along the outer periphery of the outer flange 270 of the lower polishing portion 230.

The abrasive discharged through the discharge hole 274 is moved to the receiving tub 500 through the communication hole 311 formed at the setting surface portion 310 of the lower body 300.

The upper surface of the outer flange 270 of the lower polishing portion 230 is concavely formed. I.e., the outboard edge of the outboard flange 270 is higher than the inboard edge thereof. Thus, a space for temporarily storing and moving the polishing article is formed between the lower surface of the upper polishing unit 220 and the upper surface of the outer flange 270 of the lower polishing unit 230. Accordingly, the polishing objects moved to the upper surface of the outer flange 270 of the lower polishing unit 230 may be moved to the receiving tub 500 through the discharge hole 274 without leaking to the outside.

When the lower surface of the upper polishing portion 220 corresponding to the upper surface of the outer flange 270 of the lower polishing portion 230, that is, the upper polishing portion 230 includes the outer flange 260, a sweeping (sweeping) protrusion 263 is formed on the lower surface of the upper polishing portion 220 which is the bottom surface of the outer flange 260.

The sweeping protrusions 263 function to push the polishing objects moving to the recessed upper surface of the outer flange 270 of the lower polishing part 230 to move to the discharge hole 274 when the upper polishing part 220 rotates. Therefore, the polishing objects moved to the upper surface of the outer flange 270 of the lower polishing section 230 can be quickly discharged from the discharge holes 274.

As described above, the connection shaft member 400 is inserted through the upper body 100, extends along the central portions of the upper polishing portion 220 and the lower polishing portion 230, penetrates the upper polishing portion 220 to rotatably support the upper polishing portion 220, and is fixed to the lower polishing portion 230.

The connection shaft member 400 presses the upper polishing section 220 by the compression spring 410, and thus, a sufficient surface pressure can be formed even if the upper polishing section 220 is formed to be light, and thus, the polishing target can be polished between the upper polishing section 220 and the lower polishing section 230. In addition, since the upper polishing unit 220 is elastically supported by the compression spring 410, the size of the space between the first polishing surface 221 and the second polishing surface 231 and the applied pressure are changed according to the polishing degree of the polishing object, and the polishing is gradually performed from a large particle state to a small particle state. Further, by adjusting the adjustment of the handle 420, the amount of compression of the compression spring 410 is changed, and the applied pressure is changed, so that the final polishing particle size of the polishing object, that is, the size of the polishing object can be adjusted.

Further, since the adjustment knob 420 connected to the upper end of the shaft member 400 is exposed to the outside of the upper body 100, the user can easily adjust the size of the polishing object.

On the other hand, when the connecting shaft member 400 is separated after polishing of the polishing object is completed, the upper polishing portion 220 is separated from the lower polishing portion 230 fixed to the lower body 300 in a state of being fixed to the upper body 210.

Thus, the first polishing surface 221 and the second polishing surface 231 of the upper polishing section 220 and the lower polishing section 230 on which the polishing material remains can be cleaned and washed easily. That is, since the upper polishing unit 220 and the lower polishing unit 230 can be coupled to and separated from each other by the coupling shaft member 400, the assembling property is excellent and the cleaning is easy. In addition, the user may separate the upper and lower polishing parts 220 and 230 from the upper and lower bodies 100 and 300 to perform washing and cleaning, as needed.

According to the present invention, the suction plate 330 may be provided on the bottom surface of the lower body 300. Since the grinder of the present invention can be formed in a light weight as compared with a conventional grinder made of stone, when the lower body 300 is not firmly fixed, the lower body 300 can move when the upper body 100 is rotated. However, in the case where the suction plate 330 is provided on the bottom surface of the lower body 300, when the user uses the grinder, the upper body 100 can be rotated in a state where the lower body 300 is fixed by the suction plate 330 without pressing and fixing the lower body 300. The use of the mill-type grinder without shaking can be realized, and thus the convenience of use is improved.

While the preferred embodiments of the present invention have been described above, it should be understood that the present invention is not limited to the description of one embodiment, and various modifications and implementations that can be implemented by those skilled in the art to which the present invention pertains without departing from the scope of the claims of the present invention also fall within the scope of the present invention.