CN114453110A

CN114453110A - Running-in assembly, grinding mill and material grinding method

Info

Publication number: CN114453110A
Application number: CN202210226616.5A
Authority: CN
Inventors: 陈晓霖; 赖冬平
Original assignee: Guangdong Retop Led Display Co ltd
Current assignee: Zhuhai Xinrun Intelligent Home Appliances Co ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-05-10

Abstract

The invention discloses a running-in component, a grinder and a material grinding method. The running-in component comprises a first running-in part, a second running-in part and a transmission part. The first running-in part is annular and is provided with a feeding port. , discharge port, a running-in channel is formed between the feeding port and the discharge port; the second running-in piece is arranged in the running-in channel of the first running-in piece, and is coaxial with the first running-in piece; the first running-in piece A first running-in part is provided on the second running-in part, and the first running-in part is corresponding to the second running-in part; the transmission part is also annular, and a material feed hole is formed inside the transmission part. It is fixedly connected with the second running-in piece in the circumferential direction, and the material feed port communicates with the feed port. The invention can conveniently replace the running-in components, facilitate cleaning, and is more conducive to realizing modular processing.

Description

Running-in assembly, grinding mill and material grinding method

Technical Field

The invention belongs to the field of food or medicine processing, and particularly relates to a running-in component, a grinding mill and a material grinding method.

Background

Grinding assemblies, grinders, and the like are commonly used in food or pharmaceutical processing, such as the currently used bean mills, coffee mills, and the like.

The existing grinding mills are all designed into an integrated structure, namely, the running-in component is arranged in the running-in machine, and for a common user, the condition that the user takes out the running-in component is basically not considered or is less considered. The existing structural design is mainly caused by the following reasons:

1. the designer believes that the running-in assembly, which is the core of the grinding mill, is of a removable construction, which can result in inconvenient installation and possible installation errors after removal, which can affect use.

2. The structural design of the existing running-in assembly ensures that the power of the driving mechanism is reliably transmitted to the running-in assembly, and the detachable structural design can not be conveniently realized.

The existing structural design also has very obvious defects, on one hand, the internal part of the grinding mill is not easy to clean, and the use is inconvenient; on the other hand, the modularized design and processing of the product are not facilitated, and the control of the production cost is not facilitated.

Disclosure of Invention

The invention aims to provide a running-in component, a grinding mill and a material grinding method.

The invention provides a running-in component, which comprises a first running-in component, a second running-in component and a transmission component,

the first grinding part is annular, a feed inlet and a discharge outlet are arranged on the first grinding part, and a grinding channel is formed between the feed inlet and the discharge outlet;

the second running-in part is arranged in the running-in channel of the first running-in part and is coaxial with the first running-in part;

the first running-in part is provided with a first running-in part, the second running-in part is provided with a second running-in part, and the first running-in part corresponds to the second running-in part;

the driving medium is also annular, and its inside forms logical material mouth, this driving medium with second running-in spare circumference fixed connection, should lead to the material mouth with the feed inlet communicates with each other.

In one embodiment, the transmission piece further comprises an outer fixing ring, the outer fixing ring is annular, an outer fixing portion is formed on the circumferential outer side of the outer fixing ring, the first grinding piece is fixedly installed in the outer fixing ring, a first through hole is formed in the middle of the outer fixing ring, a second through hole is formed in the middle of the transmission piece, and the transmission piece and the second grinding piece are fixedly connected after the connecting piece penetrates through the first through hole and the second through hole.

In one embodiment, the outer fixing ring comprises an outer ring body and an inner ring body, the inner ring body is arranged in the outer ring body, a plurality of connecting ribs are arranged between the inner ring body and the inner ring body along the circumferential direction, a material passing hole is formed between two adjacent connecting ribs, and the material passing hole is communicated with the material outlet; the first running-in piece is arranged in the outer ring body, and the first through hole is arranged on the inner ring body.

In one embodiment, a powder sweeping ring is arranged between the inner ring body and the second running-in piece, and powder sweeping blades are arranged on the powder sweeping ring.

In one embodiment, the outer fixing ring comprises a main fixing ring and a fixing ring, a corresponding buckling part is arranged between the fixing ring and the main fixing ring, the fixing ring is inserted into the inner wall of the main fixing ring, and the upper end of the fixing ring is provided with a flanging which sleeves the upper edge of the main fixing ring; the outer ring body and the inner ring body are arranged on the main fixing ring.

In one embodiment, the device further comprises an adjusting component, wherein the adjusting component is connected with the outer fixing ring, and the distance between the first grinding element and the second grinding element is adjusted through the adjusting component.

In one embodiment, the adjusting assembly comprises a rotating ring and an adjusting ring, corresponding adjusting threads are arranged between the outer fixing ring and the adjusting ring, the rotating ring is in limit connection with the adjusting ring in the circumferential direction, and the adjusting assembly presses the first grinding element.

In one embodiment, the transmission piece at least comprises a cylindrical part and an expansion part which expands relative to the circumference of the cylindrical part, a surrounding edge is arranged on the outer edge of the expansion part, the expansion part is received below the outer fixing ring and is communicated with the discharge hole, the surrounding edge part is positioned on the periphery of the expansion part and extends upwards, and transmission teeth are arranged on the back side of the expansion part.

The invention also provides a grinding mill, which comprises a main machine body and the running-in assembly, wherein a clamping part for placing the running-in assembly is arranged on the main machine body, a driving mechanism and a driving piece connected with an output shaft of the driving mechanism are arranged in the main machine body, and the driving piece extends to the clamping part and is matched with the transmission part.

The invention also provides a method for grinding a material, comprising the steps of,

the transmission piece drives the second running-in piece to rotate;

the material enters from a feed inlet of the first grinding part and is ground by the first grinding part and the second grinding part in the grinding channel;

discharging the ground material through a discharge hole of the first grinding part;

the materials discharged from the discharge port are discharged from the second discharge port of the transmission member.

The technical scheme provided by the invention has the following advantages and effects:

the grinding assembly comprises a first grinding part, a second grinding part and a transmission part, wherein the first grinding part is annular, a feed port and a discharge port are formed in the upper part of the first grinding part, the transmission part is fixedly connected with the second grinding part, the second grinding part is driven to rotate by the transmission part, materials are ground in a grinding channel between the feed port and the discharge port, the transmission part is also annular, a feed port is formed in the transmission part, and the ground materials directly enter the feed port and are discharged through the feed port; adopt this structure, on the one hand, can conveniently transmit drive power to the running-in position of running-in subassembly, on the other hand, this driving medium adopts annular structure, can reserve the passageway for the material, avoids the influence of driving medium to material passageway.

After the grinding assembly is adopted, the grinding assembly is made into a relatively independent structure under the conditions of reliable power transmission and material conveying channels, can be conveniently detached from a main machine, or can be matched with different main machines for use, so that the grinding mill can be conveniently cleaned, and modular processing design is convenient to carry out.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles and effects of the invention.

Unless otherwise specified or defined, the same reference numerals in different figures refer to the same or similar features, and different reference numerals may be used for the same or similar features.

FIG. 1 is a schematic external view of the grinding mill in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the grinding mill in an embodiment of the present invention;

FIG. 3 is an exploded view of the grinder of the present embodiment;

FIG. 4 is a side view of the run-in assembly in an embodiment of the present invention;

FIG. 5 is a cross-sectional view of the run-in assembly in an embodiment of the present invention;

FIG. 6 is an exploded view of the running-in assembly in a first orientation in accordance with an embodiment of the present invention;

FIG. 7 is an exploded view of the running-in assembly in a second orientation in accordance with an embodiment of the present invention;

FIG. 8 is a top view of the outer retainer ring in accordance with an embodiment of the present invention;

FIG. 9 is a side cross-sectional view of the outer retainer ring in accordance with an embodiment of the present invention;

FIG. 10 is a perspective view of the transmission member in an embodiment of the present invention;

description of reference numerals:

10. a running-in component 111, a first running-in component 1111, a feed inlet 1112, a discharge outlet 1113, a first running-in part 112, a second running-in component 1121, a second running-in part 113, an outer grinding wheel frame 1131 and a handle,

12. a transmission piece 121, an expansion part 122, a surrounding edge part 123, a cylindrical part 124, a transmission tooth 125, a second through hole 126, a connecting strip 127, a material through hole 128, an inner positioning ring,

13. the outer fixing ring 131, the main fixing ring 1311, the outer ring body 1312, the inner ring body 1313, the first through hole 1314, the connecting rib 1315, the material passing hole 132, the fixing ring 1321, the flanging 133, the buckling part 14, the powder sweeping ring 141, the powder sweeping blade 151, the rotating ring 152, the adjusting ring 153, the adjusting thread 154 and the adjusting limiting piece,

16. a connecting member 171, a sleeve 172, a spacer 173, a felt,

21. a main body 211, a clamping ring 212, a driving mechanism 213, a driving member 214, a base 2141, a container table 215, a support body 216, a cantilever,

31. container, 41, hopper.

Detailed Description

In order to facilitate an understanding of the invention, specific embodiments thereof will be described in more detail below with reference to the accompanying drawings.

Unless specifically stated or otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the case of a real-world scenario incorporating the technical solution of the present invention, all technical and scientific terms used herein may also have meanings corresponding to the purpose of achieving the technical solution of the present invention.

As used herein, unless otherwise specified or defined, "first" and "second" … are used merely for name differentiation and do not denote any particular quantity or order.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, unless specified or otherwise defined.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.

As used herein, unless otherwise specified or defined, the terms "comprises," "comprising," and "comprising" are used interchangeably to refer to the term "comprising," and are used interchangeably herein.

It is needless to say that technical contents or technical features which are contrary to the object of the present invention or clearly contradicted by the object of the present invention should be excluded.

As shown in fig. 1 to 10, the grinding mill of the present embodiment is used for grinding beans, and includes a main body 21 and a running-in assembly 10, a clamping member for placing the running-in assembly 10 is disposed on the main body 21, the main body 21 includes a base 214, a container table 2141 is disposed on one side of the base 214, a supporting main body 215 is disposed on the other side of the base 214, a cantilever 216 is disposed on the supporting main body 215, a driving mechanism 212 and a driving member 213 connected to an output shaft of the driving mechanism 212 are installed in the cantilever 216, the driving member 213 extends to the clamping member, when in use, the container table 2141 rotates to contain ground materials, and a hopper 41 is disposed above the running-in assembly 10.

The running-in component 10 comprises a first running-in component 111, a second running-in component 112 and a transmission component 12, wherein the first running-in component 111 is annular, a feed port 1111 and a discharge port 1112 are arranged on the first running-in component 111, and a running-in channel is formed between the feed port 1111 and the discharge port 1112; the second grinding part 112 is arranged in the grinding channel of the first grinding part 111 and is coaxial with the first grinding part 111; a first grinding part 1113 is arranged on the first grinding part 111, a second grinding part 1121 is arranged on the second grinding part 112, and the first grinding part 1113 corresponds to the second grinding part 1121; the transmission member 12 is also annular, and a material passing opening 127 is formed in the transmission member 12, the transmission member 12 is fixedly connected with the second grinding member 112 in the circumferential direction, and the material passing opening 127 is communicated with the material feeding opening 1111. When the running-in assembly 10 is mounted to the gripping member and engaged with the drive member.

The running-in component 10 of this embodiment includes a first running-in component 111, a second running-in component 112 and a transmission component 12, wherein the first running-in component 111 is ring-shaped, a feeding port 1111 and a discharging port 1112 are formed at an upper portion of the first running-in component 111, the transmission component 12 is fixedly connected with the second running-in component 112, the transmission component 12 drives the second running-in component 112 to rotate, the material is ground in a running-in channel between the feeding port 1111 and the discharging port 1112, the transmission component 12 is also ring-shaped, a feeding port 127 is formed on the transmission component 12, and the ground material directly enters the feeding port 127 and is discharged through the feeding port 127; adopt this structure, on the one hand, can conveniently transmit drive power to the running-in position of running-in subassembly 10, on the other hand, this driving medium 12 adopts annular structure, can reserve the passageway for the material, avoids driving medium 12 to the influence of material passageway.

After the running-in component 10 is adopted, the running-in component 10 is made into a relatively independent structure under the conditions of reliable power transmission and material conveying channels, can be conveniently detached from a main machine, or can be matched with different main machines for use, so that the grinding mill can be conveniently cleaned, and the modularized processing design is also convenient to carry out.

The first grinding element 111, the second grinding element 112 and the transmission element 12 are core components of the grinding assembly 10, and in addition, the grinding assembly 10 further includes an outer fixing ring 13, an adjusting assembly, a powder sweeping ring 14, a gasket 171, a gasket 172, a felt 173, and the like.

The outer fixing ring 13 is ring-shaped, an outer fixing portion is formed on the outer circumferential side of the outer fixing ring 13, the first grinding element 111 is fixedly installed in the outer fixing ring 13, a first through hole 1313 is formed in the middle of the outer fixing ring 13, a second through hole 125 is formed in the middle of the transmission element 12, and after a connecting element 16 (in this embodiment, the connecting element 16 is a connecting bolt) passes through the first through hole 1313 and the second through hole 125, the transmission element 12 is fixedly connected with the second grinding element 112. The outer fixing ring 13 comprises a main fixing ring 131 and a fixing ring 132, a corresponding buckling part 133 is arranged between the fixing ring 132 and the main fixing ring 131, the fixing ring 132 is inserted into the inner wall of the main fixing ring 131, a flange 1321 is arranged at the upper end of the fixing ring 132, and the flange 1321 is sleeved on the upper edge of the main fixing ring 131; the outer ring 1311 and the inner ring 1312 are disposed on the main stationary ring 131.

The main fixing ring 131 comprises an outer ring body 1311 and an inner ring body 1312, the inner ring body 1312 is arranged in the outer ring body 1311, a plurality of connecting ribs 1314 are arranged between the inner ring body 1312 and the inner ring body 1312 along the circumferential direction, a material passing hole 1315 is formed between two adjacent connecting ribs 1314, and the material passing hole 1315 is communicated with the material outlet 1112; the first grinding element 111 is disposed inside the outer ring 1311, and the first through hole 1313 is disposed on the inner ring 1312.

The adjusting component is connected with the outer fixing ring 13, and the distance between the first grinding component 111 and the second grinding component 112 is adjusted through the adjusting component, so that the grinding thickness of the material is adjusted, and the specific structure is as follows:

the adjusting assembly comprises a rotating ring 151 and an adjusting ring 152, wherein corresponding adjusting threads 153 are arranged between the outer fixing ring 13 and the adjusting ring 152, the rotating ring 151 is in circumferential limit connection with the adjusting ring 152, when a user operates the rotating ring 151, the rotating ring 151 drives the adjusting ring 152 to rotate circumferentially synchronously, concave-convex teeth are further arranged on the outer side of the rotating ring 151 in the circumferential direction to increase hand feeling, when the adjusting ring 152 rotates, the adjusting threads 153 of the adjusting ring 152 are matched with the adjusting threads 153 on the fixing ring 132, the first grinding part 111 is pressed at different height positions through the adjusting ring 152, and then the distance between the first grinding part 111 and the second grinding part 112 is changed, so that the purpose of adjusting the thickness of materials is achieved. In this embodiment, an outer fixing ring 132 is disposed between the rotating ring 151 and the first grinding element 111, the first grinding element 111 positions the first grinding element 111, and the rotating ring 151 presses the first grinding element 111 through the outer fixing ring 132 and adjusts the first grinding element 111.

The transmission member 12 at least comprises a cylindrical part 123 and an expansion part 121 expanding circumferentially relative to the cylindrical part 123, a peripheral edge is arranged on the outer edge of the expansion part 121, an inner positioning ring 128 is arranged above the cylindrical part 123, the inner positioning ring 128 is positioned close to the center of the expansion part 121, the inner positioning ring 128 can position the second grinding element 112, the inner positioning ring 128 is connected with the expansion part 121 through a plurality of connecting strips 126, a plurality of feed openings 127 are formed between the connecting strips 126, and the second through hole 125 is arranged at the center of the inner positioning ring 128. Each connecting strip 126 is arranged in an inclined sheet shape, when the second grinding part 112 is used for grinding, ground materials can fall in a spiral shape under the action of the inclined sheet-shaped connecting strips 126 when passing through the material through holes, so that fine particles or powdery materials are prevented from being scattered, and flying powder is prevented from being generated for powdery materials, and the collection of subsequent materials is more convenient.

The extension 121 is received under the outer retainer ring 13 and communicates with the outlet 1112, and the skirt portion 122 is located at the periphery of the extension 121 and extends upward to prevent the pulverized bean powder from overflowing from the side. A driving tooth 124 is provided on the back side of the expanded portion 121, and the driving member 213 is a bevel gear, and the driving tooth 124 is engaged with the bevel gear on the driving member 213. In this embodiment, the design of the transmission member 12 is relatively special, on one hand, power transmission under a detachable condition needs to be ensured, and convenient detachment needs to be realized, and after the running-in assembly 10 is quickly installed, the transmission member 12 can be timely matched with the driving member 213 to work; on the other hand, the driving member 12 is also used as a part of the ground material receiving member, and the material falls to the material passing opening 127 of the driving member 12 and is discharged.

The powder sweeping ring 14 is located between the inner ring body 1312 and the second running-in part 112, and powder sweeping blades 141 are arranged on the powder sweeping ring 14. During the grinding process, the material can be cleaned and discharged in time by the powder sweeping blade 141.

Because the transmission member 12 is circumferentially connected with the second running-in member 112, during operation, the transmission member 12, the second running-in member 112 and the first through hole 1313 of the main fixing ring 131, which are fixedly connected with each other, are relatively worn, and in order to ensure the wear resistance of the main fixing ring 131, a gasket 171 is arranged at the first through hole 1313 of the main fixing ring 131, and the gasket 171 is made of a wear-resistant material, so that the main fixing ring 131 does not need to be integrally made of a wear-resistant material, and the manufacturing cost can be effectively reduced.

The assembly of the mill described in this example is as follows:

press-fitting the main fixing ring 131 and the gasket 171 into the first through hole 1313 of the main fixing ring 131 by using a press tool and interference-fitting them with each other, and ensuring that the gasket 171 is coaxial with the main fixing ring 131; then, the fixing ring 132 is aligned with the main fixing ring 131, the buckling parts 133 on the fixing ring are aligned with the buckling parts 133 on the main fixing ring 131, the pressing is carried out by using pressure, the buckling parts 133 on the two sides of the fixing ring 132 are mutually clamped, the turned edge 1321 on the top portion covers the periphery of the top portion of the main fixing ring 131, the two parts are fixed into a whole, the coaxiality of the two parts is ensured, the gasket 171 is clamped into the first through hole 1313 of the main fixing ring 131, and through the step, the main fixing ring 131, the gasket 171 and the fixing ring 132 are assembled into a whole, and the coaxiality of the assembly is ensured through the rigid performance of the material of the main fixing ring 131.

The adjusting ring 152 and the fixing ring 132 are then screwed into the adjusting thread 153 in a circumferential rotation manner through a plurality of turns until they cannot be screwed any more.

Then taking the second grinding element 112, assembling the powder sweeping ring 14 on the shaft of the second grinding element 112, aligning the powder sweeping ring with the gasket 171 already assembled on the main fixing ring 131, and assembling the powder sweeping ring into the bottom of the shaft hole; then, the copper pad 172 is installed on the shaft and shaft end face of the second grinding element 112 exposed outside, and at the same time, the felt 173 is installed in the groove on the top of the transmission element 12 and is pressed to the bottom by hand so that only a small portion of the portion which cannot be pressed in is exposed, the transmission element 12 and the second grinding element 112 are installed on the upper end and the lower end of the main fixing ring 131, respectively, the end face of the copper pad 172 is pressed tightly, the center of the second grinding element 112 is opposite to the second through hole 125 of the transmission element 12, the connection element 16 is taken, the transmission element 12 and the second grinding element 112 are fixed, the adjusting ring 152 is taken, aligned with the exposed circumference of the rotating ring 151 and is pressed and fixed by force, and is integrated with the adjusting ring 152.

The outer grinding wheel frame 113 and the first grinding assembly 111 are aligned and pressed in forcibly, the two parts are clamped and fixed into a whole, and then the handles 1131 are installed in the transverse shaft holes at the two sides of the outer grinding wheel frame 113.

After the first grinding element 111 and the outer grinding wheel frame 113 are assembled into a whole, the first grinding element is aligned with the adjusting ring 152 and screwed in forcibly, the transmission piece 12 at the bottom is rotated forcibly, and the adjusting ring 152 is finely adjusted in the rotating process, so that when the second grinding element 112 and the first grinding element 111 rotate mutually, the internal teeth and the teeth are mutually contacted and meshed, and the second grinding element and the teeth are matched and cannot rotate and then stop; the adjustment ring 152 is then retracted back through an angle of 3 to 6 degrees to allow the second grinding element 112 to engage the first grinding element 111 with minimal clearance to avoid contact.

Once positioned, the adjustment stop tab 154 is snapped into the adjustment ring 152 to ensure that the entire helical angle is rotationally moved within the set degree range, at which point the running-in assembly 10 is fully assembled.

In use, the running-in assembly 10 is mounted on the clamping ring 211 of the main body 21, and the transmission member 12 is engaged with the driving member 213 to grind the material under the action of the driving mechanism 212.

The above embodiments are provided to illustrate, reproduce and deduce the technical solutions of the present invention, and to fully describe the technical solutions, the objects and the effects of the present invention, so as to make the public more thoroughly and comprehensively understand the disclosure of the present invention, and not to limit the protection scope of the present invention.

The above examples are not intended to be exhaustive of the invention and there may be many other embodiments not listed. Any alterations and modifications without departing from the spirit of the invention are within the scope of the invention.

Claims

1. The running-in component is characterized by comprising a first running-in component, a second running-in component and a transmission component,

2. The running-in assembly according to claim 1, further comprising an outer fixing ring, wherein the outer fixing ring is annular, an outer fixing portion is formed at a circumferential outer side of the outer fixing ring, the first running-in member is fixedly installed in the outer fixing ring, a first through hole is formed in a middle portion of the outer fixing ring, a second through hole is formed in a middle portion of the driving member, and the driving member is fixedly connected with the second running-in member after the connecting member passes through the first through hole and the second through hole.

3. The running-in assembly according to claim 2, wherein the outer fixing ring comprises an outer ring body and an inner ring body, the inner ring body is arranged in the outer ring body, a plurality of connecting ribs are arranged between the inner ring body and the inner ring body along the circumferential direction, and a material passing hole is formed between two adjacent connecting ribs and is communicated with the material outlet; the first running-in piece is arranged in the outer ring body, and the first through hole is arranged on the inner ring body.

4. The running-in assembly of claim 3, wherein a sweeping powder ring is arranged between the inner ring body and the second running-in member, and a sweeping powder blade is arranged on the sweeping powder ring.

5. The running-in assembly according to any one of claims 2 to 4, wherein the outer fixing ring comprises a main fixing ring and a fixing ring, a corresponding buckling part is arranged between the fixing ring and the main fixing ring, the fixing ring is inserted into the inner wall of the main fixing ring, and the upper end of the fixing ring is provided with a flange which is sleeved on the upper edge of the main fixing ring; the outer ring body and the inner ring body are arranged on the main fixing ring.

6. The running-in assembly of any one of claims 2 to 4, further comprising an adjustment assembly, wherein the adjustment assembly is connected with the outer retainer ring and is used for adjusting the distance between the first running-in piece and the second running-in piece.

7. The running-in assembly of claim 6, wherein the adjusting assembly comprises a rotating ring and an adjusting ring, corresponding adjusting threads are arranged between the outer fixing ring and the adjusting ring, the rotating ring is in limit connection with the adjusting ring in the circumferential direction, and the adjusting assembly presses the first grinding element.

8. A running-in assembly according to any one of claims 1 to 4, wherein the transmission member comprises at least a cylindrical portion and an extension portion extending circumferentially relative to the cylindrical portion, a peripheral edge is provided on an outer edge of the extension portion, the extension portion is received under the outer retainer ring and communicates with the discharge port, the peripheral edge portion is located on a periphery of the extension portion and extends upward, and a transmission tooth is provided on a back side of the extension portion.

9. Grinding mill comprising a main body and a running-in assembly according to any one of the preceding claims 1 to 8, a gripping member being provided on the main body for receiving the running-in assembly, a drive mechanism being provided in the main body, and a drive member being connected to an output shaft of the drive mechanism, the drive member extending to the gripping member and cooperating with the drive member.

10. A method for grinding material, characterized in that it comprises the steps of,

the transmission piece drives the second running-in piece to rotate;