JPS6231504Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a cutter bit for a rock excavation cutter device, and its purpose is to improve the durability of a so-called clamp-type cutter bit in which the cutter bit is replaceable in a holder. The gist of this is that a holder is fixed to the auger head in the direction of rotation of the auger head and tilted downward at a required angle, and a cutter bit is replaceably connected to the holder. The holder and cutter bit have a substantially square-shaped joint surface, and at least two adjacent parts of the joint surface
A key groove is formed in the center of one surface and a key is formed in the opposite surface of the other surface, and the holder and cutter bit are exchanged with bolts so that there are multiple holders and cutter bits in the width direction and longitudinal direction of the joint surface of both. The structure of the cutter bit for rock excavation cutter equipment is characterized in that the cutter bit can be connected and integrated, and the holder is made of a material having higher strength than the material of the cutter bit.

Embodiments of the present invention will be described in detail below with reference to the drawings. Figures 1 to 3 show an embodiment of the present invention, and in the figures, A is a holder, and the holder is oriented downward at a required angle α to an auger head C, which will be described later, in the direction of rotation of the auger head. It is firmly fixed in an inclined state by means such as welding.
Reference numeral B designates a cutter bit which is joined to the holder A in such a manner that the holder extends in the direction of inclination thereof, and the cutter teeth 1 are fixed to the tip portion thereof by brazing or other methods. The joint surface between the holder A and the cutter bit B has a substantially square shape when viewed from the side, and in this embodiment, at least two adjacent surfaces 2, 2' and 3, 3' of the joint surface are Keys 4 and 5 are formed in the center of the surface on the holder A side, and key grooves 4' and 5' are formed in the relative center of the surface on the cutter bit B side. Also, 6, 6... in the figure indicates cutter bit B for holder A.
Bolts 7, 7...
8 and 8' are bolt insertion holes formed in the holder A and the cutter bit B, respectively, and each bolt insertion hole is opened in a direction substantially along the direction of movement of the cutter bit.
Although this embodiment shows the case where four bolts 6 are used, three bolts 6 may be used as long as they are arranged in a plurality of bolts in the width direction and longitudinal direction of the joint surface.

Further, in order to prevent damage to the holder A side, a material with higher strength than the material of the cutter bit B is used as the material of the holder A.

Since the present invention has the above configuration, the fourth
As shown in the figure, excavation of rocks, etc. is carried out with the base of the holder A in the cutter bit of the present invention firmly fixed to the tip of the spiral blade 9 in the auger head C by welding or other means. In the cutter bit, there is a problem with the strength of the joint between the holder and the cutter bit, and as a result, the bolt that connects and integrates the joint is broken before the cutter teeth are damaged, and the holder side is also damaged. However, there was a problem in that the holder itself had to be re-welded, which made it useless as a clamp type.
On the other hand, in the present invention, the joint surfaces of the holder A and the cutter bit B are made into a substantially square shape, and the bolts 6 are further joined together by keying over at least two adjacent surfaces of the joint surfaces. By arranging a plurality of bolts in the width direction and longitudinal direction of the surface, it is possible to prevent the generation of shearing force that causes breakage of the bolts 6, and also to prevent the holder from being damaged even if an overload is applied to the cutter bit. In order to protect A, holder B is made of a material that is stronger than the material used for Katsutabit.

As explained in detail above, the present invention has the effect of improving the overall durability of the cutter bit while taking advantage of the advantages of the clamp type cutter bit.

[Brief explanation of drawings]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a front view, FIG. 3 is an exploded perspective view, and FIG. 4 is an explanatory view showing the state of use. In the figure, A: holder, B: cutter bit,
C: Auger head, 4, 5: Key, 4', 5': Keyway, 6: Bolt.

Claims (1)

[Scope of utility model registration request] It consists of a holder that is fixed to the auger head in a state where it is tilted downward at a required angle in the direction of rotation of the auger head, and a cutter bit that is replaceably joined to the holder.
The joint surface of the same holder and cutter bit is
A key groove is formed in the center of one surface and a key is formed in the opposite surface of the other surface over at least two adjacent surfaces of the joint, and the holder and cutter bit are connected to the width of the joint surface. A cutter bit for a rock excavation cutter device, characterized in that a plurality of cutter bits are connected and integrated so as to be replaceable in the direction and longitudinal direction, and the holder is made of a material with higher strength than the material of the cutter bit. .