JP2018051420A - Hammer for crushing device and crushing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a hammer for a crushing device hard to fall off, while preventing the occurrence of metal contamination.SOLUTION: A hammer body 18 constituted of ceramics is provided in a hammer for a crushing device fixed to a crushing rotor provided in a crushing chamber of the crushing device for crushing a processed product, and a metallic burying nut having a slipping-out preventive projection is buried in this hammer body 18. A nut insertion hole 18a for inserting the burying nut is formed on a bottom surface of the hammer body 18, and the slipping-out preventive projection can be inserted into this nut insertion hole 18a, and a slipping-out preventive recessed part 18c is provided for preventing slipping-out of the slipping-out preventive projection when rotating the burying nut.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a crusher hammer fixed to a crushing rotor provided in a crushing chamber of a crusher for crushing an object to be processed, and a crusher provided with the same.

  2. Description of the Related Art Conventionally, a pulverizer that pulverizes an object to be processed using a pulverizer hammer fixed to a pulverizing rotor that rotates at high speed is known. Since the hammer for a pulverizer collides violently with an object to be processed, it is usually composed of an iron or stainless steel member.

  However, if the wear powder of the crusher hammer generated during the crushing operation mixes with the product after crushing, it can be used to manufacture products that dislike the contamination of metal foreign matter (hereinafter referred to as metal contamination) such as battery materials and electronic materials. Is not suitable.

  Therefore, in recent years, there has been a need to construct a hammer for a pulverizer with a ceramic that does not generate metal contamination. However, ceramic has a weak point that it has high hardness but is susceptible to brittle fracture, and is difficult to fix to a pulverization rotor. There is a problem.

  For example, in Patent Document 1, a crushing block is formed by bonding and integrating a ceramic impact member to a metal base member. The crushing block is fixed to the crushing rotor by bolts from the upper surface of the crushing device hammer, and it is necessary to cover the top surface of the bolt head with a cap made of superalloy.

Japanese Patent No. 2721487

  However, in the hammer for a pulverizer of Patent Document 1, the cap may fall off due to a crushing impact or the like. When the cap falls off, the bolt head is exposed, and a problem of contamination of metal contamination occurs.

  Therefore, there is a method of fixing the metal nut to the bottom of the crusher hammer and fixing it with a metal bolt from the back side. However, if the adhesion between the nut and the ceramic member is not sufficient, the ceramic member will fall off. There is a problem of doing.

  This invention is made | formed in view of this point, The place made into the objective is to make the hammer for grinding | pulverizers into the thing which can prevent generation | occurrence | production of a metal contamination, and is hard to drop out.

  In order to achieve the above object, according to the present invention, a metal nut having a retaining projection is embedded in a ceramic hammer body.

Specifically, in the first invention, in a hammer for a grinding device fixed to a grinding rotor provided in a grinding chamber of a grinding device for grinding a workpiece,
A hammer body made of ceramic,
A metal embedded nut embedded in the hammer body and having a retaining protrusion;
A nut insertion hole formed on the bottom surface of the hammer body and into which the embedded nut is inserted;
The nut insertion hole is provided with a retaining recess for allowing the retaining projection to be inserted and retaining the retaining projection when the embedded nut is rotated.

  According to the above configuration, after the metal nut is inserted into the bottom of the hammer body so that the metal nut's retaining protrusion is inserted into the nut insertion hole of the hammer body, the metal nut is rotated to prevent it from coming off. The metal nut is prevented from coming off by being fitted into the recess. For this reason, even if the crushing rotor is rotated and an impact is applied to the crusher hammer, the hammer body is unlikely to come off.

In the second invention, in the first invention,
A positioning hole for positioning with the grinding rotor is formed on the bottom surface of the hammer body.

  According to the above configuration, by inserting a positioning pin or the like into the positioning hole, positioning when fixing the crusher hammer to the crushing rotor is facilitated, and the crusher hammer is difficult to rotate with respect to the crushing rotor. Become.

In the third invention, in the first invention,
On the bottom surface of the hammer body, a bulging portion for positioning with the grinding rotor is formed,
The nut insertion hole is provided in the bulging portion.

  According to said structure, the positioning when fixing the hammer for grinding | pulverization apparatus to a grinding | pulverization rotor becomes easy by inserting the bulging part for positioning in the hole of a grinding | pulverization rotor. Further, by providing the nut insertion hole in the bulging portion, the contact area between the nut outer periphery and the hammer body can be increased, and the coupling strength can be easily increased.

A pulverizing apparatus according to a fourth aspect of the invention has the hammer for a pulverizing apparatus according to any one of the first to third aspects,
An outer casing;
An inner casing that forms a space that is at least partially partitioned from the outer casing;
An input port for inputting an object to be communicated with the inner casing;
A disc-shaped grinding rotor provided in a grinding chamber below the inner casing, and a grinding liner provided on the outer periphery of the grinding rotor;
An air flow inlet communicating with the grinding chamber;
A blow-up passage that is formed between the inner casing and the outer casing and that allows a workpiece to be crushed and blown up in the crushing chamber to pass therethrough;
The crushing rotor is formed with a bolt insertion hole for inserting a bolt fastened to the embedded nut.

  According to said structure, the to-be-processed object grind | pulverized is prevented as a product, preventing generation | occurrence | production of a metal contamination by the hammer for grinding | pulverization apparatuses with which the metal nut secured reliably was embedded.

In the fifth invention, in the fourth invention,
The rotation direction in which the retaining protrusion is rotated toward the retaining recess side is opposite to the rotation direction of the grinding rotor.

  According to the above configuration, the hammer main body does not rotate in the removal direction with respect to the embedded nut to which the bolt is fastened by the reaction when the grinding rotor rotates and the workpiece collides with the grinding machine hammer.

In the sixth invention, in the fourth or fifth invention,
The outer periphery of the grinding rotor is covered with a ceramic member,
In the pulverization liner, at least the surface facing the pulverizer hammer is made of ceramic.

  According to said structure, generation | occurrence | production of a metal contamination is reliably prevented by also comprising the part which to-be-processed objects other than the hammer for crushers collide with a ceramic.

  As described above, according to the present invention, the retaining protrusion of the metal embedded nut is fitted into the retaining recess that is locked to the ceramic hammer body. Can prevent the occurrence of metal contamination and make it difficult to fall off.

FIG. 5 is an enlarged sectional view taken along line II in FIG. 4. It is a figure showing the outline of the crushing system containing the crushing device concerning the embodiment of the present invention. It is sectional drawing which shows a grinding | pulverization apparatus. It is a top view which shows a grinding | pulverization rotor and a liner for grinding | pulverization. It is a top view which shows a hammer main body. It is a bottom view which shows a hammer main body. It is the VII-VII sectional view taken on the line of FIG. It is a top view which shows an embedding nut. It is a side view which shows an embedding nut. It is a side view which shows an embedding nut. It is a top view which expands and shows the hammer for grinding machines concerning the modification of an embodiment, and its circumference. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is a bottom view which shows the hammer main body which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

-Configuration of grinding system-
FIG. 2 shows an outline of a pulverization system 10 including a pulverization apparatus 1 including a pulverization apparatus hammer 20 according to an embodiment of the present invention. The pulverization system 10 includes a feeder 2 that supplies raw materials to the pulverization apparatus 1. ing. The raw material as the object to be processed supplied from the supply machine 2 is configured to be supplied to the input port 11a of the crushing apparatus 1 through the supply rotary valve 3. On the other hand, the object to be processed pulverized by the pulverizing apparatus 1 is conveyed to the bag filter 4 together with the air flow by the exhaust fan 6. The airflow and the pulverized product are separated in the bag filter 4 so that the bag filter rotary valve 5 can be operated and taken out. An exhaust fan 6 is connected to the downstream side of the bag filter 4 so that the air in the crushing system 10 is discharged into the atmosphere. A drive unit 7 is provided below the pulverizer 1.

  As shown in FIG. 3, the pulverizing apparatus 1 has a cylindrical outer casing 1a, and a cylindrical inner casing 1b having a smaller diameter is coaxially fixed therein. A crushing chamber 11 is also coaxially coupled below the inner casing 1b. For example, in the tangential direction of the crushing chamber 11, two air flow inlets 11b are formed symmetrically with respect to the central axis. In addition, the airflow inlet 11b may be one place and does not necessarily need to be formed in the tangential direction.

  As shown in FIG. 1, a crushing rotor 12 rotates in the lower part of the crushing chamber 11. The crushing rotor 12 is provided integrally with a top portion 14 a of a rotating shaft 14 driven by a drive unit 7 provided below the crushing chamber 11. Although not shown in detail, the rotating shaft 14 of the grinding rotor 12 is rotated by the power of the grinding motor 13 (shown only in FIG. 2). The disc part 12a of the crushing rotor 12 is fixed to the top part 14a by metal mounting bolts 14b. Further, as shown in FIG. 4, for example, a cylindrical crushing liner 17 is fixed to the inner peripheral surface of the crushing chamber 11. On the other hand, a plurality of crusher hammers 20 are attached to the outer periphery of the crushing rotor 12 so that the tip is close to the crushing liner 17.

  Further, as shown in FIGS. 2 and 3, an object to be processed from the blowing passage 1 c is swirled on the upper portion of the inner casing 1 b, and the object to be processed that does not reach a predetermined particle size is dropped to thereby form the inner casing 1 b. A classifying unit 16 that plays a role of refluxing inside is disposed. The classification unit 16 can adjust the particle size to be classified according to the number of rotations of the classification rotor 16b by the electric motor 16a. The charging port 11a is formed inside a cylindrical body that is inserted so as to have an appropriate charging angle with respect to the outer casing 1a, and communicates with the inner casing 1b through the outer casing 1a. On the other hand, from the center of the lower end of the classifying unit 16, a discharge pipe 11c that forms a discharge port for discharging the object to be processed extends downward, then bends and extends sideways through the inner casing 1b and the outer casing 1a. .

  The airflow from the airflow inlet 11b passes through a predetermined passage toward the crushing chamber 11, and blows up the airflow passage 1c formed between the outer casing 1a and the inner casing 1b that separates the inside of the object to be processed while flying up. The air is conveyed to the upper classifying unit 16 through the air, and the object to be processed having a predetermined particle size is discharged out of the apparatus through the discharge pipe 11c. On the other hand, those that do not reach the predetermined particle size fall into the inner casing 1 b and are crushed again in the crushing chamber 11.

  As shown in FIGS. 1 and 4, the crusher hammer 20 includes a hammer body 18 made of ceramic such as alumina. As shown in FIGS. 5 to 7, the hammer body 18 has a trapezoidal shape in a plan view, for example, and a pair of retaining projections 19 a are provided on the bottom side thereof, as shown in FIGS. 8A to 8C. A metal embedding nut 19 is fitted. The embedded nut 19 has a pair of retaining projections 19a facing each other, and a female screw 19b is processed at the center. The number of the retaining protrusions 19a may be one or three or more, but two or more protrusions 19a have a higher retaining effect.

  Moreover, the shape of the hammer 20 for a pulverizer is not limited to a trapezoidal shape in plan view, and may be a pentagonal cross section. Although the ceramic which comprises the hammer main body 18 is not specifically limited, For example, it consists of silicon nitride or zirconia. Silicon nitride is desirable in terms of wear resistance and cost effectiveness. A nut insertion hole 18a having a circular cross section is formed on the bottom surface of the hammer body 18 and into which the embedded nut 19 is inserted.

  The nut insertion hole 18a has an insertion portion 18b extending radially from the nut insertion hole 18a so that the retaining protrusion 19a can be inserted, and when the embedded nut 19 is rotated, for example, 25 ° A retaining recess 18c having a predetermined thickness is formed on the bottom surface side so as to prevent the retaining projection 19a from being detached. In the present embodiment, a pair of retaining recesses 18c are provided at positions facing the nut insertion holes 18a. If there are three or more retaining projections 19a, three or more retaining recesses 18c may be provided accordingly.

  A positioning hole 18d for positioning the grinding rotor 12 is formed on the bottom surface of the hammer body 18 at a position spaced from the nut insertion hole 18a. The positioning hole 18d has a circular cross section in accordance with a cylindrical or round bar positioning pin (not shown), but may have any cross sectional shape that matches the cross sectional shape of the positioning pin.

  Further, for example, eight bolt insertion holes 12b (shown in FIG. 1) for inserting the fixing bolts 22 to be fastened to the embedded nut 19 are formed in the grinding rotor 12 at equal intervals. The number of bolt insertion holes 12b is provided in accordance with the number of crusher hammers 20, but the number is not limited.

  Further, the rotational direction in which the retaining protrusion 19 a is rotated toward the retaining recess 18 c is opposite to the rotational direction of the grinding rotor 12. By doing so, the hammer main body 18 does not rotate in the removal direction with respect to the embedded nut 19 due to the reaction when the grinding rotor 12 rotates and the workpiece collides with the grinding machine hammer 20.

  Further, the outer periphery of the grinding rotor 12 is covered with a cover member 21 made of a ceramic member. Specifically, the cover member 21 includes a circular cover-shaped center cover 21a that covers the heads such as metal mounting bolts 14b and screws 14c exposed to the disk portion 12a of the crushing rotor 12, and a crushing device hammer 20. And a ring-shaped cover 21b having a central cylindrical portion covering the portion. A through-hole 21c through which the fixing bolt 22 is inserted is formed in the ring-shaped cover 21b. The cover member 21 is bonded to the grinding rotor 12 with an adhesive, for example. The adhesive is required to have a heat resistance of about 100 ° C. in consideration of heat generation during pulverization. Note that an adhesive having a heat resistance of about 250 ° C. can also be applied to a pulverizing apparatus that performs dry pulverization while heating. In this manner, the portion where the object to be processed other than the hammer 20 for the crusher collides is also made of ceramic, so that the occurrence of metal contamination can be reliably prevented.

  In this embodiment, the crushing liner 17 is made of ceramic such as silicon nitride, but at least only the surface facing the crushing device hammer 20 may be made of ceramic. Since the crushing liner 17 itself does not rotate, it is not necessary to fix the crushing liner 17 to the outer casing 1a or the like with the fixing bolt 22 or the like.

  In the present embodiment, the embedded nut 19 is fitted into the bottom surface of the hammer body 18 so that the retaining protrusion 19a of the embedded nut 19 is inserted into the nut insertion hole 18a of the hammer body 18, and then the embedded nut 19 is inserted. And the embedded nut 19 is prevented from coming off by being fitted into the retaining recess 18c. For this reason, even if the crushing rotor 12 is rotated and an impact is applied to the crusher hammer 20, the hammer body 18 is unlikely to come off.

  Moreover, in this embodiment, the to-be-processed object grind | pulverized can be taken out as a product, preventing generation | occurrence | production of a metal contamination with the hammer 20 for grinders by which the embedding nut 19 reliably prevented from detaching was embedded.

  In this embodiment, the positioning hole 18d is used to facilitate positioning when the crushing device hammer 20 is fixed to the crushing rotor 12, and the crushing device hammer 20 is difficult to rotate with respect to the crushing rotor 12. Become.

  Therefore, according to the hammer 20 for a pulverizer according to this embodiment, the hammer 20 for a pulverizer can prevent the occurrence of metal contamination and can be made difficult to fall off.

-Modification-
9 to 11 show modifications of the embodiment of the present invention, which are different from the embodiment in that the positioning structure is different. In the following modifications, the same portions as those in FIGS. 1 to 8C are denoted by the same reference numerals, and detailed description thereof is omitted.

  That is, a bulging portion 118d for positioning with the grinding rotor 112 is formed on the bottom surface of the hammer main body 118 of this modification, and the nut insertion hole 18a is provided in the bulging portion 118d.

  Further, in this modification, the positioning bulge portion 118d is fitted into the positioning hole 112c of the crushing rotor 112, thereby facilitating positioning when the crushing device hammer 20 is fixed to the crushing rotor 112. Further, since the nut insertion hole 18a is provided in the bulging portion 118d, by increasing the height of the embedded nut 19, the contact area between the outer periphery and the hammer body 18 is increased, and the coupling strength is easily increased. .

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Crusher
1a External casing
1b Inner casing
1c passage
2 feeder
3 Rotary valve for supply
4 Bug filters
5 Rotary valve for bag filter
6 Exhaust fan
7 Drive unit
10 Grinding system
11 Crushing chamber
11a inlet
11b Airflow inlet
11c discharge pipe
12 Grinding rotor
12a Disc part
12b Bolt insertion hole
13 Electric motor for grinding
14 Rotating shaft
14a top
14b Mounting bolt
14c screw
16 class division
16a electric motor
16b Classification rotor
17 Grinding liner
18 Hammer body
18a Nut insertion hole
18b Insertion part
18c Recess for positioning
18d Positioning hole
19 Embedded nut
Projection for 19a
19b Female thread
20 Hammer for crusher
21 Cover member
21a Center cover
21b Ring-shaped cover
21c Through hole
22 fixing bolt 112 crushing rotor 112c positioning hole 118d bulge

Claims (6)

In a hammer for a crusher fixed to a crushing rotor provided in a crushing chamber of a crusher for crushing an object to be processed,
A hammer body made of ceramic,
A metal embedded nut embedded in the hammer body and having a retaining protrusion;
A nut insertion hole formed on the bottom surface of the hammer body and into which the embedded nut is inserted;
A retaining recess formed in the nut insertion hole, allowing the retaining protrusion to be inserted, and retaining the retaining protrusion when the embedded nut is rotated; A hammer for a pulverizing apparatus. The hammer for a crusher according to claim 1,
A hammer for a grinding apparatus, wherein a positioning hole for positioning with the grinding rotor is formed on a bottom surface of the hammer body. The hammer for a crusher according to claim 1,
On the bottom surface of the hammer body, a bulging portion for positioning with the grinding rotor is formed,
The hammer for a pulverizer, wherein the nut insertion hole is provided in the bulging portion. A crushing device comprising the crusher hammer according to any one of claims 1 to 3,
An outer casing;
An inner casing that forms a space that is at least partially partitioned from the outer casing;
An input port for inputting an object to be communicated with the inner casing;
A disc-shaped grinding rotor provided in a grinding chamber below the inner casing, and a grinding liner provided on the outer periphery of the grinding rotor;
An air flow inlet communicating with the grinding chamber;
A blow-up passage that is formed between the inner casing and the outer casing and that allows a workpiece to be crushed and blown up in the crushing chamber to pass therethrough;
A pulverizing apparatus, wherein the pulverizing rotor has a bolt insertion hole through which a bolt to be fastened to the embedded nut is inserted. The crusher according to claim 4, wherein
A pulverizing apparatus, wherein a rotation direction for rotating the retaining protrusion toward the retaining recess side is opposite to a rotation direction of the pulverizing rotor. In the crushing device according to claim 4 or 5,
The outer periphery of the grinding rotor is covered with a ceramic member,
The pulverizing liner is characterized in that at least a surface facing the pulverizing device hammer is made of ceramic.

Images