JPH0428954Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a removable cutter tooth for a cutter head for rotary excavation such as an excavator for a pile driver or a boring machine.

[Prior art] As shown in Fig. 3, the conventional cutter head is
Bit unit d consisting of a plurality of cutter teeth c is arranged in two rows on flight b of cutter body a.

Each cutter tooth c is welded to the flight b or is detachably attached to the flight b using a bolt e as shown in FIG.

[Problems to be solved by the invention] However, when the cutter teeth c are fixed by welding, the replacement work of the cutter teeth c becomes troublesome, and the installation accuracy tends to deteriorate because the cutter teeth c are fixed by welding again after being removed.

Furthermore, when fixing with bolts e, since the bolts e are exposed, the excavation resistance with the excavated ground is large, shearing force is applied to the bolts e, and the bolts e are likely to break.

[Means for Solving the Problems] The present invention was made with the purpose of solving the above-mentioned problems and making it possible to easily and reliably attach and detach the cutter teeth. A support hole extending in the cutter tooth mounting direction is formed in the shank, a rear end of the cutter tooth is inserted into the support hole, and the shank extends in the cutter tooth mounting direction on the rear end surface of the rear end. This invention relates to a removable cutter tooth characterized in that the cutter tooth is removably fixed to a shank by screwing a penetrating bolt therethrough.

[Function] Since the cutter teeth inserted into the support holes of the shank fixed to the cutter body are fixed by bolts extending in the direction in which the cutter teeth are installed on the rear end side, no digging resistance is applied to the bolts, and there is no risk of bolt breakage. The cutter teeth are removably fixed.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

Figures 1 and 2 are an embodiment of the present invention,
A plurality of shank 3 are fixed to the flight 2 of the cutter head 1 by welding so that two bite units are formed. Each shank 3 has a support hole 5 formed in the direction in which the cutter tooth 4 is attached, and the opening of the support hole 5 has a large diameter so that the rear end of the head 6 of the cutter tooth 4 can be fitted therein. Further, a through hole 7 is formed at the rear end of the shank 3 in the direction in which the cutter tooth 4 is attached.

The cutter tooth 4 consists of a head portion 6 having a carbide tip 8 fixed to its tip, and a support arm portion 9 that can be inserted into the support hole 5.
A female thread 10 is provided on the rear end surface so that a bolt 11 passing through the through hole 7 of the shank 3 can be screwed and fixed.

With the above configuration, cutter tooth 4
If the carbide tip 8 of the cutter tooth 4 is damaged or worn out, remove the fixing bolt 11 screwed onto the support arm 9 of the cutter tooth 4 and remove the deteriorated cutter tooth 4.
is pulled out from the support hole 5, the support arm part 9 of the new or polished cutter tooth 4 is inserted into the support hole 5 of the shank 3, and the bolt 11 passes through the through hole 7 of the shank 3 from the outside of the shank 3.
When screwed into the female thread, the cutter tooth 4
is fixed so as to be drawn into the support hole 5.

This allows rotary excavation.

Note that the removable cutter tooth of the present invention is not limited to the above-mentioned embodiments, and that the support arm portion and the support hole may be tapered.
Of course, various modifications may be made without departing from the spirit of the present invention, such as the head of the fixing bolt may be buried within the shank.

[Effects of the Invention] As described above, the removable cutter tooth of the present invention can provide various excellent effects as described below.

() Since the bolt for fixing the cutter tooth is positioned on the rear end side in the digging direction so as to extend in the direction in which the cutter tooth is attached, it is safe because the bolt is not subjected to shearing force due to digging resistance.

() Cutter teeth can be easily replaced on site, streamlining work.

() If the carbide tip becomes unusable due to damage or wear, only the cutter teeth need to be replaced, making it economical.

() Since the cutter teeth can be easily replaced, the optimum cutter teeth can be equipped according to the soil quality of the ground to be excavated, which expands the range of excavation work and improves excavation efficiency.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the removable cutter tooth of the present invention, Fig. 2 is a view taken in the - direction arrow of Fig. 1, Fig. 3 is an explanatory diagram showing an example of a conventional cutter head, and Fig. 4 is an explanatory diagram of an embodiment of the removable cutter tooth of the present invention. It is an explanatory view showing an example of a conventional cutter tooth attachment mode. 1 is a cutter head, 2 is a flight, 3 is a shank, 4 is a cutter tooth, 5 is a support hole, 7 is a through hole, 9 is a support arm portion, and 11 is a bolt.

Claims (1)

[Scope of utility model registration request] A shank is fixed to the flight of the cutter body, a support hole is formed in the shank that extends in the direction in which the cutter tooth is attached, and the rear end of the cutter tooth is inserted into the support hole, and the cutter tooth is attached to the rear end surface of the rear end. By screwing a bolt extending in the mounting direction and penetrating the shank,
A removable cutter tooth characterized in that the cutter tooth is removably fixed to a shank.