TW202108058A - Grinding device capable of rapidly removing electrostatic charges and improving powder spreading and remaining issues caused by electric charge accumulation - Google Patents

Abstract

A grinding device suitable for grinding an object to be grinded is disclosed. The grinding device comprises a shaft unit; a grinder unit that is fitted on the shaft unit and is driven by the shaft unit for grinding the object to be grinded; and, a supporting unit for supporting the shaft unit and the grinder unit. The supporting unit is mainly made of conductive composition and coupled with the grinder unit by injection molding. Because the supporting unit is made of conductive composition for electric conduction, it can improve the electric charge accumulation condition and the powder spreading and remaining issues caused by electric charge accumulation.

Description

Grinding device

The present invention relates to a food processor, in particular to a grinding device suitable for grinding an object to be ground such as coffee beans.

The general grinder is suitable for grinding coffee beans into coffee powder. The grinder usually includes a supporting unit made of non-conductive plastic, a rotating shaft unit passing through the supporting unit, and a rotating shaft unit that is clamped on the supporting unit and can be driven by the rotating shaft unit for grinding coffee beans The sharpening unit.

When the knife sharpening unit is driven by the rotating shaft unit, it can grind coffee beans into coffee powder. However, in the process of being ground into powder, coffee beans will constantly rub against the grinding unit, resulting in a large amount of electric charge accumulated on the surface of the supporting unit and the coffee powder, causing the coffee powder to easily adhere to the surface of the coffee powder under the action of static electricity The supporting unit remains in the grinder, resulting in insufficient output of the coffee powder ground by the grinder, or a phenomenon of flying powder due to electrostatic repulsion. In addition, the coffee powder remaining in the grinder last time is deteriorated and mixed with the newly ground coffee powder, which will also affect the flavor of the brewed coffee.

Therefore, the purpose of the present invention is to provide a grinding device that can at least overcome the disadvantages of the prior art.

Therefore, the grinding device of the present invention is suitable for grinding an object to be ground, and includes a rotating shaft unit, a sharpening unit that passes through the rotating shaft unit and can be driven by the rotating shaft unit to grind the object, and a supporting device. The rotating shaft unit and the supporting unit of the sharpening unit are mainly made of conductive composition and combined with the sharpening unit by injection molding.

The effect of the present invention is that the support unit is made of a conductive composition that can conduct electricity, and the sharpening unit is combined with the support unit by embedding injection molding, so that the components are tightly combined without gaps, creating an environment without electrical impedance. Therefore, the static charge generated during the grinding process can be quickly discharged from the grinding chamber by the support unit and the sharpening unit, so as to improve the problems of fly powder and residual powder caused by the accumulation of electric charges.

1 and 2, an embodiment of the grinding device 10 of the present invention is suitable for grinding an object to be ground (for example, coffee beans) into a ground material (for example, coffee powder). The grinding device 10 is suitable for being installed in a mounting housing 101 of a grinder, and can be driven by a driving device (not shown in the figure) of the grinder. Since the structure and the assembling relationship of the mounting housing 101 and the driving device are not the focus of this case, and are common knowledge, it will not be repeated here.

Referring to Figures 2 and 3, the grinding device 10 includes a rotating shaft unit 1 that can be driven by the driving device 1, a sharpening unit 2 that is sheathed on the rotating shaft unit 1, and a sharpening unit 2 mainly made of a conductive composition and supporting the The shaft unit 1 and the supporting unit 3 of the sharpening unit 2.

The rotating shaft unit 1 includes a self-rotating shaft 11 made of metal and extending up and down along an axis L, and a top sleeve 12 that is tapered and sleeved on the top of the self-rotating shaft 11 and adapted to be inserted into the driving device.

The self-rotating shaft 11 includes a cylindrical top shaft portion 111 spaced up and down along the axis L for the top sleeve 12 to pass through, a bottom shaft portion 112 with a smaller radial width, and an integrally connected to the top shaft portion 111. A shaft portion 113 is connected between the shaft portion 111 and the bottom shaft portion 112.

The sharpening unit 2 is made of metal, and includes a set of inner grinding blades 21 that are provided on the connecting shaft portion 113 of the rotation shaft 11 and can be driven to rotate by the rotation shaft 11, and surround the inner grinding blades 21 at intervals. And the outer grinding knife 22 that can cooperate with the inner grinding knife 21 to grind the object to be ground, and a ring sleeve 23 that wraps around the outer grinding knife 22.

The inner grinding knife 21 is generally frusto-conical and has an inner surface 211 facing the outer grinding knife 22.

The outer grinding knife 22 has an outer knife surface 221 facing the inner grinding knife 21 and defining a grinding space 24 together with the inner knife surface 211, and an outer knife surface 221 extending radially outward from the top edge of the outer knife surface 221 The ring-shaped connecting surface 222.

Before starting to describe the support unit 3, readers should understand that the aforementioned "support unit 3 is mainly made of conductive composition" means that most of the elements of the support unit 3 are made of conductive composition, but some of the elements are made of conductive composition. Made of metal. However, in other embodiments of the present invention, each element of the support unit 3 can also be made entirely of the conductive composition, or each element of the support unit 3 can also be mainly made of the conductive composition, That is, the main material of each element of the supporting unit 3 is the conductive composition, but it can contain other possible additives.

The supporting unit 3 includes a top bearing 31 piercing through the top shaft portion 111 of the autorotating shaft 11, a bottom bearing 32 piercing through the bottom shaft portion 112 of the autorotating shaft 11, and a bottom bearing 32 piercing through the bottom shaft 112 of the autorotating shaft 11. 11 of the connecting shaft portion 113 and connected to the knife holder 33 of the internal grinding knife 21, a positioning ring 34 that passes through the connecting shaft portion 113 and is located below the knife holder 33, and a holder that passes through the shaft unit 1 The bottom shaft portion 112 extends to surround the base 35 of the outer grinding knife 22, a top seat 36 that passes through the top shaft portion 111 of the shaft unit 1 and is connected to the outer grinding knife 22 and surrounds the base 35, and A wire 37 electrically connected to the top base 36.

Both the top bearing 31 and the bottom bearing 32 are made of metal. The top bearing 31 is located between the top shaft portion 111 and the top seat 36, and the bottom bearing 32 is located between the bottom shaft portion 112 and the base 35, and can cooperate with the top bearing 31 for the rotation shaft 11 to be relative to the The base 35 and the top seat 36 rotate on their own.

The knife holder 33 is made of a conductive composition, is tightly sleeved on the connecting shaft portion 113 of the self-rotating shaft 11, and is combined with the internal grinding knife 21 by injection molding, and cannot be opposed to the internal grinding knife. 21 is detached and closely attached to the inner grinding knife 21.

The tool holder 33 includes a disk body portion 331 and a cylindrical body portion 332 that is hollow columnar and passes through the connecting shaft portion 113 of the rotating shaft 11 and is connected to the disk body portion 331 in the same body.

The conductive composition includes a plastic component, and a conductive component doped in the plastic component. Based on the total weight of the conductive composition being 100% by weight, the plastic component is 70% by weight, and the conductive component is 30% by weight.

The plastic component can be selected from but not limited to nylon (Nylon) plastic, polypropylene (PP), polycarbonate (PC), polystyrene (PS), acrylonitrile-styrene Acrylonitrile-styrene copolymer (SAN), acrylonitrile butadiene styrene (ABS), high density polyethylene (HDPE), polyoxymethylene , POM for short), Polybutylene terephthalate (PBT for short), and at least one of the group consisting of the foregoing materials. The conductive component can be selected from metal, conductive carbon fiber, graphite, conductive nano At least one of the group consisting of carbon tubes, conductive polymers, and the foregoing materials. Based on the total weight of the conductive composition being 100 wt%, the plastic component can also be 65 wt% to 90 wt%, and the conductive component can also be 10 wt% to 35 wt%. In other variations of this embodiment, the conductive composition is a conductive polymer.

The positioning ring 34 is made of metal, sleeved on the connecting shaft portion 113 of the rotating shaft 11, and located between the tool holder 33 and the bottom bearing 32 and above the bottom bearing 32 at intervals. The positioning ring 34 is used to support the knife holder 33 to prevent the knife holder 33 from sliding down along the connecting shaft portion 113.

The base 35 is made of the same material as the tool holder 33, and includes an injection-molded bottom ring portion 351 coupled to the outer peripheral surface of the bottom bearing 32, and three branches upward and radially from the bottom ring portion 351 A bottom connecting rod portion 352 extending outward, and a bottom ring frame portion 353 of the outer grinding knife 22 that are integrally connected to the top peripheral edge of the bottom connecting rod portion 352 and looped around the outer grinding knife 22.

The top seat 36 is made of the same material as the tool seat 33, and includes a top sleeve ring portion 361 that is injection-molded and joined to the outer peripheral surface of the top bearing 31, and three branches descend from the top sleeve ring portion 361. A top connecting rod portion 362 extending radially outward, and a top connecting rod portion 363 that is integrally connected to the bottom peripheral edge of the top connecting rod portion 362 and looped around the bottom ring frame portion 353 of the base 35. The top seat 36 and the base 35 cooperate to support the rotating shaft unit 1 through the top bearing 31 and the bottom bearing 32, so that the rotating shaft unit 1 is driven without shaking when rotating around the axis L as the axis, that is to say, it can Keep the axis stable.

2 to 4, the production method of the parts of the grinding device 10 is described as follows: First, the tool holder 33 is formed by injection molding, and the tool holder 33 is combined with the internal grinding knife 21 during the cooling and molding process. At the same time, it cannot be detached from the inner grinding knife 21 and tightly coupled to the inner grinding knife 21, and then cooperates with the inner grinding knife 21 to form an inner knife group 41 as shown in FIG. 4; The top seat 36 is formed by injection molding, and the top seat 36 is closely combined with the outer peripheral surface of the top bearing 31 and the connecting surface 222 of the outer grinding knife 22, and is closely connected with the top bearing 31 and the outer grinding knife 22 Cooperate to form an outer cutter set 42 as shown in FIG. 4; finally, the base 35 is formed by injection molding, and the base 35 is tightly combined with the outer peripheral surface of the bottom bearing 32, and is connected to the bottom bearing 32. Cooperate to form a support group 43 as shown in FIG. 4.

The method of assembling the grinding device 10 is: first sleeve the inner knife set 41 tightly on the connecting shaft portion 113; then sleeve the positioning ring 34 on the connecting shaft portion 113; and then the outer knife set 42 is sleeved on the top shaft portion 111, and the outer knife set 42 is supported by a spring 13, and then the support set 43 is sleeved on the bottom shaft portion 112, and the base 35 is clamped to the outer grinding knife 22 and The top seats 36; finally, the top sleeve 12 is sleeved on the top shaft portion 111.

When the grinding device 10 is in use, the driving device drives the rotating shaft unit 1, so that the inner grinding knife 21 is driven to rotate, and then the inner knife surface 211 rotates relative to the outer knife surface 221, and the grinding The object to be ground in the space 24 is ground into powder, and falls into a powder storage box 102 located below the grinding device 10.

Because in this embodiment, in addition to the shaft unit 1 is made of metal, the knife holder 33, the base 35, and the top seat 36 of the support unit 3 are also made of conductive components, and they are tightly molded by injection molding. Combined with the inner grinding knife 21, the bottom bearing 32 and the outer grinding knife 22 made of metal, there is no gap in the joint, so the resistance value is extremely small. Therefore, the charge generated in the process of grinding the object to be ground into a grinding object can be dispersed to improve the problem of fly powder and residual powder caused by the accumulation of electric charge.

In this embodiment, since the wire 37 is also provided, this embodiment can also pass through the base 35, the bottom bearing 32, the knife holder 33, the internal grinding knife 21, the rotating shaft unit 1, the top bearing 31 Together with the outer grinding knife 22, it passes through the top seat 36 and the wire 37 in order to discharge the charge to the outside, which can more effectively improve the problem of flying powder generated by the charge accumulation in the grinding device 10 and the grinding object. , And reduce the situation that the abrasive is attached to the polishing device 10 due to the charge.

To sum up, the grinding device 10 of the present invention utilizes the design of the supporting unit 3 to disperse the charge generated during the grinding process, and improve the problem of flying powder caused by the charge of the grinding object and the attachment to the grinding device 10. Furthermore, reducing the residual amount of the grinding material and increasing the powder output can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

10: Grinding device 101: Install the shell 102: Toner storage box 1: Rotating shaft unit 11: Rotation axis 111: Top shaft 112: bottom shaft 113: connecting shaft 12: Top cover 13: Spring 2: Sharpening unit 21: Internal grinding knife 211: Inner Knife Face 22: External grinding knife 221: Outer Blade 222: Connection surface 23: ring sleeve 24: Grinding space 3: Support unit 31: Top bearing 32: bottom bearing 33: knife holder 331: Disc Body 332: Cylinder 34: positioning ring 35: base 351: Bottom Ring 352: bottom connecting rod 353: bottom ring frame 36: Top seat 361: Top ring part 362: Top connecting rod 363: Bottom Ring 37: Wire 41: inner knife group 42: Outer knife set 43: Support group L: axis

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view illustrating an embodiment of the grinding device of the present invention installed in a housing of a grinder and assembled in a driving device; Figure 2 is a three-dimensional exploded view illustrating the embodiment, and in the figure, for ease of understanding, the forcibly separated parts are originally tightly joined by injection molding; Figure 3 is a cross-sectional view illustrating the embodiment; and Fig. 4 is a cross-sectional view illustrating the assembly method of the embodiment.

1: Rotating shaft unit

11: Rotation axis

111: Top shaft

112: bottom shaft

113: connecting shaft

12: Top cover

2: Sharpening unit

21: Internal grinding knife

211: Inner Knife Face

22: External grinding knife

221: Outer Blade

222: Connection surface

23: ring sleeve

3: Support unit

31: Top bearing

32: bottom bearing

35: base

352: bottom connecting rod

353: bottom ring frame

36: Top seat

361: Top ring part

362: Top connecting rod

363: Bottom Ring

37: Wire

L: axis

Claims (8)

A grinding device is suitable for grinding an object to be grinded, and comprises: a rotating shaft unit, a sharpening unit that passes through the rotating shaft unit and can be driven by the rotating shaft unit to grind the object to be grinded, and a supporting shaft unit With the support unit of the knife sharpening unit, the support unit is mainly made of conductive composition and combined with the knife sharpening unit by injection molding. The grinding device according to claim 1, wherein the rotating shaft unit includes a top shaft portion and a bottom shaft portion opposite to each other, and a connecting shaft portion connected between the top shaft portion and the bottom shaft portion, and the grinding The knife unit includes an inner grinding knife that is sleeved on the connecting shaft and can be driven to rotate, and an outer grinding knife that surrounds the inner grinding knife and can cooperate with the inner grinding knife to grind the object to be ground. The support The unit includes a top seat and a base that are made of a conductive composition and are sheathed outside the top shaft portion and the bottom shaft portion to cooperate to support the rotating shaft unit, and the top seat is injection-molded and combined with the outer grinding knife And support the external grinding knife. The grinding device according to claim 2, wherein the support unit further includes a top bearing and a bottom bearing that can conduct electricity and respectively pass through the top shaft portion and the bottom shaft portion, and the top bearing is located on the top shaft portion Between the top seat, the bottom bearing is located between the bottom shaft portion and the base, the top seat is also combined with the top bearing by injection molding, and the base is combined with the bottom bearing by injection molding. The grinding device according to claim 2, wherein the supporting unit further includes a knife holder that is sleeved on the connecting shaft portion and located between the connecting shaft portion and the inner grinding knife, and the knife holder is ejected from the conductive composition Formedly combined with the internal grinding knife. The polishing device according to any one of claims 1 to 4, wherein the conductive composition comprises a plastic component and a conductive component, and the plastic component is selected from the group consisting of nylon plastic, polypropylene, polycarbonate, and polycarbonate. Styrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-benzenediene copolymer, high-density polyethylene, polyoxymethylene, polybutylene terephthalate, and among the groups composed of the foregoing materials At least one, the conductive component is at least one selected from the group consisting of metals, conductive carbon fibers, graphite, conductive carbon nanotubes, conductive polymers, and the foregoing materials. The polishing device according to claim 5, wherein, based on the total weight of the conductive composition being 100 wt%, the plastic component is 65 wt% to 90 wt%, and the conductive component is 10 wt% to 35 wt%. The polishing device according to any one of claims 1 to 4, wherein the conductive composition is a conductive polymer. The polishing device according to claim 2, wherein the supporting unit further includes a wire electrically connected to the top seat.

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