JPH0242791Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a roller bit installed in a cutter head at the front of an excavator.

BACKGROUND TECHNOLOGY As shown in FIG. 4, a roller bit 3 installed on a cutter head 2 on the front side of an excavator 1 is conventionally mounted on a cutter shaft 5 supported by a mounting seat 4 via a bearing 6, etc., as shown in FIG. A rotatably fitted ring body 7 is provided, and two cutter disks 8, for example, for excavating rock or the like are fitted onto the outer periphery of the ring body 7 by shrink fit. 9 is a protrusion on the ring body 7 with which the cutter disk 8 engages, and 10 is a spacer that maintains the distance between the two cutter disks 8.

Problems to be Solved by the Invention According to the above-mentioned conventional structure, it was difficult to replace the cutter disk 8 on-site, which was worn out after or during excavation work, because it was shrink-fitted.

This invention solves the above problems, and allows only the cutter disk to be replaced even during on-site work.
A cutter disk that is economical because it can effectively use a ring body and a cutter shaft that have little wear, can sufficiently resist the rolling force that the cutter disk receives, and has a simple shape that allows for easy heat treatment such as quenching. The purpose of the present invention is to provide a roller bit having the following characteristics.

Means for Solving the Problems In order to solve the above problems, the present invention provides a roller bit provided in the cutter head at the front of the excavator, in which a collar is provided on the ring body rotatably supported on the cutter shaft. A notch is provided in the flange along a plane along the axis, an annular groove corresponding to the flange is provided in the fitting hole of the cutter disk that fits externally into the ring body, and the annular groove is provided with a cutout corresponding to the flange. The structure is such that a protrusion corresponding to the notch is provided.

Effect In the above configuration, the groove and the protrusion of the cutter disk are engaged with the flange and the notch of the ring body, respectively, and are externally fixed, thereby counteracting the excavation pressing force and rolling force applied to the cutter disk. The cutter disk can be supported and prevented from rotating, and the shape of the cutter disk can be made into a simple shape that can be easily heat-treated.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. FIG. 1 is a side cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken from FIG. 1, and FIG. 3 is an exploded perspective view of the main parts thereof. In FIGS. 1 to 3, 15 is a cutter shaft supported by a mounting seat 14 of a roller bit 13 provided on a cutter head 12 at the front of the excavator, and a protrusion 15a on which a bearing 16 is locked is formed in the center. Also, cutter shaft 1
A shaft support portion 15b that fits into the bearing 14 of the mounting seat 14 is formed at both ends of the shaft support portion 5. Reference numeral 17 denotes a ring body rotatably fitted onto the cutter shaft 15 via a bearing 16, and has a cutter support portion 17A on its outer peripheral surface, a collar portion 17B protruding in the circumferential direction at the center of the cutter support portion 17A, Collar fitting parts 17C having a smaller outer diameter than the cutter support part 17A are formed at both ends of the cutter support part 17A. In addition, on both sides of the collar portion 17B in the axial direction, there are cutout portions 17D cut out on a plane along the axis at, for example, three locations at predetermined intervals in the circumferential direction so as to circumscribe the outer periphery of the cutter support portion 17A. A collar portion 17 is provided between the notch portions 17D on both sides.
A portion of B is left to form a spacer portion 17E.

Reference numeral 18 denotes a cutter disk having an inclined surface extending from the center of the outer circumference toward both sides in the axial direction, and is connected to the ring body 1.
A fitting hole 18 that fits externally into the cutter support portion 17A of No. 7
a, and an annular flange fitting groove 18b that fits into the flange 17B is provided in a peripheral wall portion corresponding to the flange 17B of this fitting hole 18a, and this flange fitting groove 17b
The inner diameter d is set to be slightly larger than the outer diameter D of the flange 17B so that there is a gap a when they are fitted to facilitate machining and assembly. The flange fitting groove 18b is provided with an engaging protrusion 18d that fits into a notch 17D formed in the flange 17B. Ring body 17
The two cutter disks 18 attached to both sides of the flange 17B have their fitting holes 18a externally fitted into the cutter support portion 17A of the ring body 17 to center the cutter disks 18. 17
The engagement protrusion 18d engages with the notch 17D to prevent the cutter disk 18 from rotating, and the spacer portion 17E of the ring body 17 maintains the distance between the two cutter disks 18. 19
is a cover ring in which two cutter disks 18 are fixed to a ring body 17 via a collar 20 with bolts 21. Further, 22 and 23 are sealing materials, and 24 is a cover.

The roller bit 13 is assembled by fitting the two heat-treated cutter disks 18 onto the cutter shaft 15 from both sides of the ring body 17 which is rotatably fitted on the cutter shaft 15, and engaging the ring body 17 with the notch 17D. 20 through the cover ring 19 and the bolt 21
to fix the cutter shaft 1 to the ring body 17.
5 is fixed to the mounting seat 14.

Effects of the invention As described above, according to the invention, when the cutter disk becomes worn, it is easy to replace only the cutter disk, and the ring body and cutter shaft, which are less worn, can be used effectively, and the cutter disk can be easily replaced. The cutting force and rolling force applied to the cutter disk can be reliably supported and prevented from rotating, and since the cutter disk does not have a complicated shape such as a keyway, heat treatment can be easily performed without causing cracks or cracks. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention;
Fig. 2 is a cross-sectional view of Fig. 1, Fig. 3 is an exploded perspective view of the main part thereof, Fig. 4 is a front view showing the excavator, and Fig. 5 is a partially cutaway side view showing a conventional example. . 12...Cutter head, 13...Roller bit, 14...Mounting seat, 15...Cutter shaft, 17
...Ring body, 17A...Cutter support part, 17
B...Brim part, 17D...Notch part, 17E...
Spacer part, 18... cutter disk, 18a
...Fitting hole, 18b...Flame fitting groove, 18d...
Engagement protrusion.

Claims (1)

[Scope of utility model registration request] In a roller bit installed in a cutter head on the front side of an excavator, a ring body 17 rotatably supported by a cutter shaft is provided with a flange 17B, and a notch 17 is formed by cutting out the flange on a plane along the axis.
D, an annular groove 18b corresponding to the flange 17B is provided in the fitting hole 18a of the cutter disk 18 externally fitted to the ring body 17, and a protrusion 18d corresponding to the notch is provided in the annular groove. A roller bit characterized by the following.