JPH0729093U - Excavator drilling head structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention not only enables complete excavation of the entire excavation surface by one revolution of the excavation shaft, but also effectively prevents wear of the bit side edge due to excavation. The present invention provides an excavating head structure for an excavator. [Structure] Each bit 3a mounted on one mounting plate 2a constituting the excavating head is attached to the other mounting plate.
Alternately with respect to the bit 3b attached to the switch 2b,
Moreover, the rotation loci are different from each other so that the side edges of the bits slightly overlap each other. The bits 3a and 3b attached to the respective attachment plates 2a and 2b
Not only is it possible to completely excavate a predetermined excavation surface by one rotation of the excavation shaft 5 while cooperating with each other,
It is possible to effectively prevent wear of the side edges of the bits 3a and 3b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an excavating head structure of an excavator used for civil engineering work and construction work.

[0002]

[Prior art]

 Conventionally, as a drilling head of this type of excavator, a required number of mounting plates are radially mounted on a mounting shaft that can be mounted at the lower end of the drilling shaft, and each mounting plate is mounted on the mounting plate. It is known that a required number of bits are attached at constant pitches with the same rotation locus. The excavating head is attached to the lower end of the excavating shaft that constitutes the excavator, and the excavating operation is performed by the bit while rotating the excavating shaft in a predetermined direction.

[0003]

[Problems to be solved by the device]

 By the way, in the conventional excavating head configured as described above, since the bits mounted at a fixed pitch on each mounting plate rotate with the same rotation locus, it is inevitable that the gap between the bits is not excavated. Not only is reliable excavation difficult, but the side edges of each bit are easily damaged by wear.

The present invention solves all the problems in the past, and not only complete excavation of the entire excavation surface with one revolution of the excavation shaft, but also effective wear of the bit side edge due to excavation. It aims to provide a convenient excavator head structure that can be prevented.

[0005]

[Means for Solving the Problems]

 That is, according to the present invention, a required number of mounting plates 2a and 2b are radially mounted on the mounting shaft 1 which can be mounted on the lower end of the excavating shaft 5, and the mounting plates 2a and 2b are required to be mounted on the mounting plates 1a and 2b. In the excavating head structure of the excavator in which a certain number of bits 3a and 3b are mounted at a predetermined pitch, each bit 3a mounted on the one mounting plate 2a is mounted on the other mounting plate 2b. The bit 3b and the bit 3b are attached to each other with different rotation loci so that the bit side edges are slightly overlapped with each other.

[0006]

[Action]

 While the bits 3a and 3b attached to the respective attachment plates 2a and 2b cooperate with each other, one rotation of the excavation shaft 5 can completely excavate a predetermined excavation surface.

[0007]

【Example】

 An embodiment of the present invention shown in the drawings will be described below. Reference numeral 1 denotes a short-shaped mounting shaft that can be freely attached to a lower end portion of an excavating shaft 5 to be described later, and 2a and 2b are horizontally mounted on an outer peripheral wall of the mounting shaft 1 and have a pair of both sides having a required length. The mounting plates 3a and 3b are the required number of bits respectively mounted on the mounting plates 2a and 2b, and each bit 3a mounted on one mounting plate 2a is the other mounting plate. They are attached to the bit 3b attached to the belt 2b in a staggered manner and with different rotation loci so that the side edges of the bit slightly overlap each other. Reference numeral 4 is a pilot bit attached to the lower end of the attachment shaft 1. In addition, 5 is a rotatable excavating shaft that constitutes an excavator, and 6 is a stirring blade that is attached to the lower part of the excavating shaft 5 in a multistage manner.

Next, the operation of the embodiment configured as described above will be described. First, as shown in FIG. 3, the mounting shaft 1 is attached to the lower end of the excavation shaft 5, and then the excavation shaft 5 is rotated in a predetermined direction. Then, the respective bits 3a and 3b attached to the attachment plates 2a and 2b start excavation while rotating around the excavation shaft 5 in respective predetermined rotational loci. At this time, the respective bits 3a mounted on the one mounting plate 2a rotate in a staggered manner with respect to the bits 3b mounted on the other mounting plate 2b, and the bit side edges are slightly overlapped. Since they are attached with different trajectories, as shown in FIG. 4, it is possible to excavate the gap between each bit 3a on one side while complementing each other by cooperating with each bit 3b on the other side. A complete revolution of the excavation surface can be completed with one revolution of the shaft 5. Further, since the bits 3a and 3b can be completely excavated without forming unexcavated portions as in the conventional example, abrasion at the side edges thereof can be effectively prevented. Similarly, the required excavation work may be performed while the excavation shaft 5 is fully excavated by one revolution of the excavation shaft 5 by cooperating the bits 3a and 3b.

In the above embodiment, the bits 3a and 3b are arranged on the left and right through the pair of mounting plates 2a and 2b on both sides, but the invention is not limited to this. The excavator 5 may be arranged radially through the mounting plate, and the excavation shaft 5 to be mounted is not limited to the above-mentioned embodiment, and other known excavators are constituted. It can also be applied to excavation axes.

[0010]

[Effect of device]

 Since the present invention is configured as described above, the predetermined excavation surface is completely completed by one rotation of the excavation shaft 5 while cooperating the bits 3a and 3b attached to the respective attachment plates 2a and 2b. As compared with the conventional example, it is possible to excavate more reliably, and it is possible to effectively prevent abrasion of the side edges of the bits 3a and 3b.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view showing a state in which the excavator shaft 5 is mounted.

FIG. 4 is a plan view showing an excavated state of the respective bits 3a and 3b.

[Explanation of symbols]

 1 Mounting Axis 2a ・ 2b Mounting Plate 3a ・ 3b Bit 5 Excavation Axis

Claims (1)

[Scope of utility model registration request] 1. A required number of attachment plates 2a and 2b are radially attached to an attachment shaft 1 which is freely attachable to a lower end of an excavation shaft 5, and the required number is provided to each of the attachment plates 2a and 2b. In an excavating head structure of an excavator in which bits 3a and 3b are attached at a predetermined pitch, each bit 3a attached to the one attachment plate 2a is attached to the other attachment plate 2b. An excavating head structure for an excavator, characterized in that the excavating heads are attached to each other in a staggered manner with respect to 3b and with different rotational trajectories so that the bit side edges slightly overlap each other.