JP2005305390A - Hammer knife for crushing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently crush a woody system chip material, to enhance wearing-resistance of a blade tip, to suitably confirm inversion and exchange timing by visual recognition and to be economically used. <P>SOLUTION: Mounting holes 2 for mounting to a rotation plate rotated by a main rotation shaft in a crushing chamber are formed at two positions becoming vertically symmetry and V grooves 6 are provided on blade tip surfaces 3 at both upper and lower ends. Further, a display groove 7 for making the limit of abrasion visually recognizable is formed on a surface 4 left from the mounting hole 2 with a predetermined distance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hammer knife suitable for a pulverizing apparatus for pulverizing a wood chip material.

2. Description of the Related Art Conventionally, as a device for pulverizing wood or the like, there is a pulverizing device provided in a pulverizing chamber with a rotor rotated by a main rotating shaft, a hammer attached to the rotor, and a fixed blade facing the hammer (see Patent Document 1). ).
However, the hammer used for crushing wood with a conventional crushing apparatus has a flat cutting edge and a large impact area that impacts the crushing wood, so that the impact force is dispersed. Moreover, in the heat treatment, the portion of the blade edge is difficult to harden to the inside.

Some hammers have a plurality of cutting edges at symmetrical positions, and when one of the cutting edges is worn, the hammer is reversed and the other cutting edge is used. In such a hammer, since the necessity of reversal / replacement is determined by measuring the wear amount of the blade edge, the reversal time may be delayed and exceed the wear limit. If it is reversed after exceeding the wear limit, the support portion of the mounting hole is too small. If the support portion further wears during operation, the support portion may be damaged and the hammer may fall off. Therefore, the hammer exceeding the wear limit cannot be used in reverse, and the life of the hammer is shortened, which is uneconomical.
Japanese Patent Application Laid-Open No. 09-065508

  The present invention solves the above-mentioned problem in the hammer of the crushing apparatus, can efficiently crush the wood chip material, improve the wear resistance of the cutting edge, and can properly confirm the reversal and replacement time visually. An object of the present invention is to provide a hammer knife for a grinding device that can be used economically.

In the hammer knife of the present invention, in order to solve the above-described problems, mounting holes for mounting on a rotating plate that is rotated by a main rotating shaft in the crushing chamber are formed at two vertically symmetrical positions, and V is formed on the edge surfaces of both upper and lower ends. A groove is provided.
This hammer knife has V-grooves on the cutting edge surfaces at the upper and lower ends, so the impact area that gives impact to the wood chip material to be crushed is small, the impact force per unit area is large, and it can be crushed efficiently. Can do. Further, in the heat treatment, the edge portion is hardened deeply to the inside, so that the wear resistance is improved.

In addition, by forming a display groove on the surface that is separated from the mounting hole by a predetermined distance so that the wear limit can be visually recognized, it is possible to determine whether the hammer knife needs to be reversed or replaced simply by observing the wear state of the blade edge. Can be confirmed.
Therefore, there is no possibility of reversing the hammer knife in a state where the wear limit is exceeded, the hammer knife can be used effectively for a long period of time, and operation costs can be reduced.

  The hammer knife of the pulverizing apparatus of the present invention can efficiently pulverize the wood chip material, and can improve the wear resistance of the cutting edge. In addition, the inversion and replacement time can be appropriately confirmed by visual observation, and can be used economically.

FIG. 1 is a perspective view of a hammer knife of a crushing apparatus showing an embodiment of the present invention, and FIG. 2 is a configuration diagram of the crushing apparatus using the hammer knife.
In the pulverizing apparatus of FIG. 2, the pulverizing chamber 11 has a cylindrical shape, and a pulverizing rotating body 12 is provided therein. The crushing rotary body 12 fixes a disk-shaped rotating plate 15 and a rotating plate 16 having a plurality of radial arms 16a to the main rotating shaft 13 at predetermined intervals in the axial direction. The hammer knife 1 is rotatably mounted on the hammer knife mounting shaft 18.

The main rotating shaft 13 extends from the grinding chamber 1 to the outside and is supported by a bearing (not shown). Power is transmitted from an electric motor (not shown) to be rotated.
A fixed blade 19 is fixed to the inner surface of the crushing chamber 11 so as to face the tip of the hammer knife 1. A discharge screen 14 is provided in the lower part of the crushing chamber 11. In the upper part of the crushing chamber 11, an input port 17 is provided for supplying a wood chip material to be crushed.

The hammer knife 1 is a rectangular plate that is long in the vertical direction when viewed from the front, and the mounting holes 2 for mounting on the hammer knife mounting shafts 18 of the rotary plates 15 and 16 are formed at two locations so as to be vertically symmetrical. ing. V-grooves 6 are provided in parallel with the surface 4 on the edge surfaces 3 at the upper and lower ends of the hammer knife 1.
In addition, on the front surface 4 and the back surface 5, a display groove 7 is provided in an annular shape concentric with the mounting hole 2 so as to be visually separated from the mounting hole 2 by a predetermined distance.

When the wood chip material is pulverized by this pulverizer, the electric motor is activated to rotate the main rotating shaft 13 and the rotary plates 15 and 16, and the wood chip material is introduced into the pulverization chamber 11 from the inlet 17. At this time, the hammer knife 1 is rotated radially by centrifugal force.
The wood chip material is hit and pulverized by the cutting edge surface 3 and the side surface 8 of the rotating hammer knife 1, is blown toward the inner surface of the crushing chamber 11, collides with the fixed blade 19, and is further pulverized to become a pulverized product. The pulverized material passes through the discharge screen 14 and is discharged downward.

Since the hammer knife 1 is provided with the V-grooves 6 on the blade tip surfaces 3 at both the upper and lower ends, the impact area that gives an impact to the wood chip material is small, the impact force per unit area is large, and the hammer knife 1 is efficiently pulverized. Further, since the V-groove 6 is provided on the blade edge surface 3, the heat treatment effect is good and the inside is hardened deeply, so that the wear resistance is improved.
The hammer knife 1 has two mounting holes 2 at the top and bottom, and can be mounted upside down. Further, since the display groove 7 that allows the wear limit to be visually recognized is formed on the front surface 4 and the back surface 5, it is possible to determine whether the hammer knife 1 needs to be reversed or replaced simply by visually observing the wear state of the cutting edge surface 3. Can be confirmed.
Therefore, the hammer knife 1 can be safely reversed and used without leaving the required support portion and exceeding the wear limit, and the operation cost can be reduced by effectively using the hammer knife 1 for a long period of time.

3, 4, and 5 are perspective views of a hammer knife of a crushing apparatus showing another embodiment of the present invention.
The hammer knife 1 of the crusher of FIG. 3 is provided with an arc-shaped display groove 7 on the front surface 4 and the back surface 5 on the side of the blade edge surface 3 from the mounting hole 2. Other configurations are the same as those in FIG. 1, and the same effects can be obtained.
The hammer knife 1 of FIGS. 4 and 5 is provided with a V-groove 9 also on the side surface 8 of the hammer knife 1 of FIGS. 1 and 3. These hammer knives 1 also improve the effect of pulverization by the side surface 8.

It is a perspective view of the hammer knife of the crusher which shows one embodiment of the present invention. It is a block diagram of the grinding | pulverization apparatus using a hammer knife. It is a perspective view of the hammer knife of the crusher which shows other embodiment of this invention. It is a perspective view of the hammer knife of the crusher which shows other embodiment of this invention. It is a perspective view of the hammer knife of the crusher which shows other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hammer knife 2 Mounting hole 3 Cutting edge surface 4 Front surface 5 Back surface 6 V groove 7 Display groove 8 Side surface 9 V groove 11 Grinding chamber 12 Grinding rotary body 13 Main rotating shaft 14 Discharge screen 15 Rotary plate 16 Rotary plate 16a Arm 17 Input port 18 Hammer knife mounting shaft 19 Fixed blade

Claims (2)

  A hammer knife for a pulverizing apparatus in which mounting holes for mounting on a rotating plate rotated by a main rotating shaft in a pulverizing chamber are formed at two vertically symmetrical positions, and V-grooves are provided on the upper and lower end blade surfaces.   2. The hammer knife of a crushing apparatus according to claim 1, wherein a display groove is formed on the surface so as to be visually recognized from the wear limit at a predetermined distance from the mounting hole.

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