JPH0710093U - Cutter bit mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a mounting structure for a cutter bit, which has a simple structure and high mounting strength for the cutter bit, and which allows the cutter bit to be easily attached and detached. [Structure] Fitting recess 1 in which a cutter bit 13 is fitted with a cutter bit holding portion 16 of a cutter bit holder 14.
Have 9. The fitting groove 21 formed in the inner wall surface of the fitting recess 19 has a fitting groove 17 of the cutter bit holding portion 16.
The holding spacer 18 fitted to is slidably fitted. Then, the cutter bit 13 is fastened by the through bolt 22 as the inner wall surface of the fitting recess 19 and the wall surface adjacent thereto contact the cutter bit holding portion 16 and the fixing portion 15 of the cutter bit holder 14, respectively.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutter bit attachment structure for detachably attaching a cutter bit to a rotating member of an excavator used when excavating rock or the like.

[0002]

[Prior art and its problems]

 For example, the head portion of an earth auger for excavating rock is equipped with a spiral blade 2 around a shaft 1 and a cutter bit 3 attached to the tip of the spiral blade 2 as shown in FIG. .

Conventionally, the cutter bit 3 is often attached to the spiral blade 2 by welding or the like. However, recently, it has been required that the cutter bit 3 can be easily replaced when the cutter bit 3 is worn or damaged. Therefore, some cutter bits 3 can be detachably attached to the spiral blade 2. Proposed.

However, in the attachment structure of the cutter bit proposed hitherto, the attachment strength of the cutter bit 3 to the spiral blade 2 is insufficient, the wobbling and displacement of the cutter bit 3 after attachment, and the attachment structure of the cutter bit 3 There were problems such as complication, and it was not fully satisfied.

An object of the present invention is to provide a cutter bit mounting structure which has a simple structure and a high mounting strength for the cutter bit, and which allows the cutter bit to be easily attached and detached.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a fixing portion facing an inner surface of a notch formed by notching a tip of a rotary member of an excavator, and the fixing portion prevents the inside of the notch from being formed. A cutter bit holder fixed to the side surface and provided with a cutter bit holding portion protruding from the fixing portion, and a holding spacer fitted into a fitting groove formed in the holding portion of the cutter bit holder. And a fitting recess into which the cutter bit holding portion fits, and a fitting groove into which the holding spacer slides and fits is formed on the inner wall surface of the fitting recess. A cutter bit whose adjacent wall faces each of the cutter bit holding portion and the fixing portion, and a fastening member having a through bolt penetrating the cutter bit and the cutter bit holding portion are provided. It is an feature.

[0007]

[Function and effect of device]

 According to the present invention, the cutter bit has the fitting recess into which the cutter bit holding portion of the cutter bit holder is fitted, and the fitting groove formed on the inner wall surface of the fitting recess is provided with the fitting bit of the cutter bit holding portion. The holding spacer fitted in the fitting groove slides into the fitting, and the inner surface of the fitting recess of the cutter bit and the adjacent wall contact the cutter bit holding part and the fixing part of the cutter bit holder, respectively, and the fastening member. Since it is fastened with, the lateral displacement of the cutter bit can be effectively prevented, the cutter bit can be firmly attached, and the cutter bit can be easily attached to and detached from the cutter bit holder by sliding.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. An embodiment of a cutter bit mounting structure according to the present invention is shown in FIGS.

The spiral blade (rotating member) 11 of the earth auger head has a notch 12 at its tip. A cutter bit holder 14 for holding the cutter bit 13 is fixed to the cutout portion 12.

The cutter bit holder 14 has an L-shaped fixing portion 15 having a size and shape corresponding to the inner side surface of the cutout portion 12 of the earth auger head, and the outer side surface of the fixing portion 15 is provided. The spiral blade 11 is fixed to the cutout portion 12 of the spiral blade 11 by welding the inner surface of the cutout portion 12 of the spiral blade 11.

The cutter bit holder 14 also has a cutter bit holding portion 16 having a quadrangular cross section that projects from one member 15 a of the fixing portion 15 and extends along the other member 15 b. The cutter bit holding portion 16 is integrated with one member 15a and the other member 15b of the fixing portion 15.

As shown in FIGS. 4 and 5, each of the pair of facing surfaces of the cutter bit holding portion 16 has a cross section that extends from the vicinity of the one member 15a of the fixing portion 15 in parallel with the other member 15b. Form two holding spacer fitting grooves 17, 17 each having a rectangular shape.

A holding spacer 18 having a rectangular cross section is fitted in each of the holding spacer fitting grooves 17. Each of the holding spacers 18 has a height greater than the depth of the holding spacer fitting groove 17 into which the holding spacer 18 is fitted, and a part of each of the holding spacers 18 faces the pair of facing surfaces of the cutter bit holding portion 16. Protruding from.

On the other hand, the cutter bit 13 has a substantially U-shape having two legs 13a and 13b, and the cutter bit holder 14 is provided between the two legs 13a and 13b. A fitting concave portion 19 of the cutter bit holding portion 16 is formed. The fitting recess 19 has an inner dimension equal to the outer dimension of the cutter bit holding portion 16, and is fitted in the holding spacer fitting groove 17 of the holding spacer 18 formed in the cutter bit holding portion 16, respectively. The holding spacer fitting groove 21 into which the holding spacers 18 are fitted is formed on the inner wall surfaces of the two leg portions 13a and 13b so as to face each other.

In the cutter bit 13, the holding spacer fitting grooves 21 of the two leg portions 13 a and 13 b are fitted into the holding spacers 18, respectively, and the cutter bit holders 14 are guided by the holding spacers 18. From the tip side of the cutter bit holding part 16 on the side opposite to the one member 15a of the fixing part 15, the cutter bit holding part 16 is slidably fitted to the cutter bit holding part 16 and the cutter bit holding part of the cutter bit holder 14 is attached. 16, abutting against one member 15a and the other member 15b of the fixing portion 15. In this state, the cutter bit 13 is fastened to the cutter bit holding portion 16 by, for example, two penetration bolts 22.

Each of the through bolts 22 passes through a through hole 23 formed in one leg portion 13 a of the cutter bit 13 to a through hole 24 formed in the cutter bit holding portion 16, and another leg portion is formed. 13b, which reaches a bolt hole 25 having a thread groove formed on the inner surface thereof, and is screwed into the thread groove of the bolt hole 25.

With such a configuration, the cutter bit 13 is fitted onto the cutter bit holding portion 16 and, as described above, one of the cutter bit holding portion 16 and the fixing portion 15 of the cutter bit holder 14 is provided. The cutter bit 13 is in contact with the member 15a and the other member 15b, and moreover, the cutter bit 13 is fastened to the cutter bit holding portion 16 by the through bolt 22, so that the cutter bit 13 wobbles or shifts even if it receives a large load. Does not occur. Further, due to the presence of the holding spacer 18, the shearing force acting on the through bolt 22 is significantly reduced, and the breakage of the through bolt 22 can be prevented. Further, the shapes of the cutter bit 13 and the cutter bit holder 14 are relatively simple, and their processing is easy.

In the above embodiment, the holding spacer fitting groove 17 formed in the cutter bit holding portion 16 and the holding spacer fitting groove 21 of the cutter bit 13 are crossed as described with reference to FIGS. 4 and 5. Although the surface has a rectangular shape, the holding spacer fitting groove 17 (and 21) may have a semicircular cross-sectional shape as shown in FIGS. 6 and 7. Further, as shown in FIGS. 8 and 9, the cross-sectional shape may be triangular.

FIGS. 10 and 11 show an embodiment in which the cutter bit mounting structure according to the present invention is applied to a casing cutter bit incorporated in an all-swivel type excavating cutter. In this embodiment, the cutter bit holder 32 of the cutter bit 31 fixed to the rotary member 51 (see FIG. 17) of the excavating cutter of the excavator is such that the fixing portion 33 has a substantially U shape. The cutter bit holding portion 34 of the cutter bit holder 32 is integrally connected to the fixing portion 33. A holding spacer fitting groove 35 into which a holding spacer (not shown) is fitted is formed on each of a pair of opposing surfaces of the cutter bit holding portion 34. These holding spacer fitting grooves 35 define one of the pair of facing surfaces of the cutter bit holding portion 34 in order to define the fitting direction of the cutter bit 31 to the cutter bit holding portion 34 described below. Therefore, the formation position is different.

The cutter bit 31 is disposed on one side of the pair of surfaces of the cutter bit holding portion 34, and the leg portion 36 a that abuts the fixing portion 33 and the pair of surfaces of the cutter bit holding portion 34. It has another leg 36b arranged on the other side and in contact with the fixing portion 33. Retaining spacers on the cutter bit 31 side are provided on the inner wall surfaces of the leg portions 36a and 36b, respectively, corresponding to the retaining spacer fitting grooves 35 of the cutter bit retaining portion 34 into which the retaining spacers are fitted. A fitting groove 37 for use is formed.

For the cutter bit 31 and the cutter bit holding portion 34, bolt holes 38 and 39 for fastening and fixing the cutter bit 31 to the cutter bit holding portion 34 by using through bolts (not shown) and screw grooves on the inner surface. To form a bolt hole (not shown).

Even in the case of the configuration described above, the U-shaped fixing portion 33 and the cutter bit holding portion 34 of the cutter bit holder 32 are in a state of abutting the surface of the cutter bit 31 facing them and making a surface contact. Further, since it is fastened with a through bolt (not shown), the cutter bit 31 does not wobble or shift even when subjected to a large load, and the shearing force acting on the through bolt due to the presence of the holding spacer is also provided. Since it is reduced, it is possible to prevent the breakage of the bolt and the like, and it is possible to obtain the same effects as those described with reference to FIGS.

In the embodiment of FIGS. 10 and 11, as shown in FIGS. 12 to 15, the facing surfaces 41 and 42 of the cutter bit 31 and the fixing portion 33 of the cutter bit holder 32 are inclined, You may make it what is called a dovetail groove structure. With such a configuration, the fastening force of the through bolt and the restraining force of the cutter bit holder 32 due to the dovetail groove structure with respect to the cutter bit 31 against the stress from the side surface of the cutter bit 31 during excavation increase, and the cutter bit during excavation It is possible to make the structure sufficiently strong even with respect to the response from the side surface of 31.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a cutter bit mounting structure according to the present invention.

2 is a perspective view of the cutter bit holder of the embodiment of FIG. 1. FIG.

3 is a perspective view of the cutter bit of the embodiment of FIG. 1. FIG.

4 is a plan view of the cutter bit holder of the embodiment of FIG. 1. FIG.

5 is a side view of the cutter bit holder of the embodiment of FIG. 1. FIG.

FIG. 6 is a plan view of a cutter bit holder according to a modified example of the embodiment shown in FIG.

FIG. 7 is a side view of the cutter bit holder of FIG.

FIG. 8 is a plan view of a cutter bit holder according to a modified example of the embodiment shown in FIG.

9 is a side view of the cutter bit holder of FIG. 8. FIG.

FIG. 10 is a perspective view of a cutter bit according to another embodiment of the cutter bit mounting structure of the present invention.

11 is a perspective view of a cutter bit holder to which the cutter bit of FIG. 10 is attached.

FIG. 12 is a perspective view of a modified example of the cutter bit of FIG.

FIG. 13 is a side view of the cutter bit of FIG.

FIG. 14 is a plan view of a cutter bit holder to which the cutter bit of FIG. 12 is attached.

FIG. 15 is a side view of the cutter bit holder of FIG.

FIG. 16 is an explanatory diagram of a head portion of an earth auger.

FIG. 17 is a perspective view of a rotating member of a full swing type excavating cutter.

[Explanation of symbols]

 11 spiral blade 12 notch portion 13 cutter bit 13a leg portion 13b leg portion 14 cutter bit holder 15 fixed portion 16 cutter bit holding portion 17 holding spacer fitting groove 18 holding spacer 19 fitting groove 21 holding spacer fitting groove 22 Through bolt 23 Through bolt 24 Through bolt 25 Bolt hole 31 Cutter bit 32 Cutter bit holder 33 Fixing part 34 Cutter bit holding part 35 Holding spacer fitting groove 36a Leg part 36b Leg part 37 Holding spacer fitting groove 38 Bolt hole 41 Opposing surface 42 Opposing surface

Claims (1)

[Scope of utility model registration request] 1. An excavator having a fixing portion facing an inner side surface of a cutout portion formed by cutting out a tip of a rotary member of the excavator and being fixed to the inner side surface of the cutout portion by the fixing portion, A cutter bit holder provided with a cutter bit holding portion protruding from the fixing portion, a holding spacer fitted into a fitting groove formed in the holding portion of the cutter bit holder, and the cutter bit holding portion There is a fitting recess for fitting, and a fitting groove into which the holding spacer is slid fit is formed on the inner wall surface of the fitting recess, and the inner wall surface and the wall surface adjacent thereto are the cutter bit holding portion and A cutter bit, comprising: a cutter bit that comes into contact with each of the fixing portions; and a fastening member that has a through bolt that penetrates the cutter bit and the cutter bit holding portion. Mounting structure.