JPS6231505Y2 - - 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. A recess formed by an upper flange and a lower flange is formed at the joint on the cutter bit side,
A tongue-like protrusion that engages in the recess and a support wall that engages one side of the upper flange and the lower flange are formed on the joint portion on the holder side, and the tips of the upper flange and the lower flange, In addition, an engaging protrusion is provided on the inner bottom of the recess, and a notch is formed on the holder side opposite to the engaging protrusion to engage with the protrusion, and a plurality of protrusions are provided between the upper flange, the tongue-shaped protrusion, and the lower flange. A cutter bit for a rock excavation cutter device is characterized in that the cutter bit is replaceably connected and integrated with a bolt, 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 cutter teeth 1 are fixed to the tip thereof by brazing or other methods. 2 is a recess formed in the joint on the cutter bit B side, 3
and 3' are an upper flange and a lower flange forming the recess 1, and 4 is a tongue-shaped protrusion formed at the joint on the holder A side, which engages with the recess 2 on the cutter bit B side. Reference numeral 5 denotes a support wall formed at the holder A side joint portion, and is provided so as to abut and engage substantially along one side of the upper flange 3 and lower flange 3'. 6, 6', 6'' are engagement protrusions protruding from the tips of the upper flange 3 and lower flange 3' and the inner bottom of the recess 2;
7′, 7″ are cutout portions into which the engaging protrusion engages; 8;
8... is a bolt that connects and integrates the cutter bit B with the holder A in a replaceable manner, and a plurality of bolt insertion holes 9' and 9'' are provided in the lower flange 3' and the tongue-shaped protrusion 4, respectively. , the upper flange 3 is provided with a screw hole 9.

Note that it is desirable that a plurality of bolts 8 be provided in the vertical direction and the width direction.

In addition, 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, the spiral blade 10 in the auger head C
Rocks, etc., are excavated with the base of the holder A in the present cutter bit firmly fixed to the tip of the cutter bit by welding or other means, but in the conventional so-called clamp-type cutter bit, the holder and the cutter bit are not connected to each other. There was a problem with the strength of the parts, and as a result, not only would the bolts that connect and integrate the joint parts break before the cutter teeth were damaged, but the holder side would also be damaged, and the holder itself would have to be re-welded. However, there was a problem that the meaning of using a clamp type was lost. On the other hand, in the present invention, the upper flange 3 on the cutter bit B side is especially attached to the joint on the holder A side.
and a support wall that engages with one side of the lower flange 3', and engagement protrusions 6, 6', 6'' are provided at the tips of the upper flange 3 and the lower flange 3' and at the inner bottom of the recess, respectively. A notch 7 that engages with each of these protrusions on the holder A side facing this,
7' and 7'', respectively, in order to prevent the generation of shearing force that causes breakage of the bolt 8, and to protect the holder A even if an overload is applied to the cutter bit. 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 the drawing]

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, 2: Recess, 3: Upper flange, 3': Lower flange, 4: Tongue-shaped protrusion, 5: Support wall, 6, 6', 6'': Engagement protrusion, 7, 7',
7″: Notch, 8: 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.
A recess formed by an upper flange and a lower flange is formed at the joint on the cutter bit side, and a tongue-like protrusion that engages in the recess is formed at the joint on the holder side, and one side of the upper and lower flanges. A supporting wall is formed to engage with each other, and engagement protrusions are provided protrudingly on the tips of the upper flange and the lower flange and on the inner bottom of the recess, and the holder side facing these is engaged with these. In addition to forming a notch, the upper flange, tongue-shaped protrusion, and lower flange are connected and integrated in a replaceable manner using multiple bolts, and the material of the holder is made of a material with higher strength than the material of cutter bit. A cutter bit for rock excavation cutter equipment, characterized by: