Cutter blade

Abstract

To provide a cutter blade which, especially, prevents deviation in a joint part between a cutter blade base material and a blade part at the time of cutting work, and which prevents damage in the blade part, in a cutter blade of a two-piece structure which can achieve reduction in a maintenance cost.SOLUTION: A cutter blade 10 which is mounted on an attachment X for construction machine mounted at an arm tip of a construction machine such as a power shovel is constituted by including, a cutter blade base material 11 and a blade part 12. The cutter blade base material 11 and the blade part 12 include a bolt hole 13 for joint for mounting the blade part 12 on the cutter blade base material 11 by a bolt. In the bolt hole 13 for joint at the joint part of the cutter blade base material 11 and the blade part 12, a sleeve 14 is disposed across the cutter blade base material 11 and the blade part 12.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a cutter blade attached to a construction machine attachment attached to the tip of an arm of a construction machine such as an excavator.

Background Art

[0002] Conventionally, various construction machine attachments provided with cutter blades (cutting blades) have been disclosed (see, for example, Patent Documents 1 to 3). The crushing cutter disclosed in Patent Document 1 includes a fixed jaw main body forming a fixed jaw side cutting body and a movable jaw main body forming a movable jaw side cutting body, which are provided in an outer casing of the crushing cutter so as to be openable and closable. A fixed jaw side constricted portion is formed along the cutting side surface of the fixed jaw side cutting body on the fixed jaw main body, and a fixed jaw side reinforcing portion is formed at a location outside the opening and closing direction of the fixed jaw side constricted portion. On the movable jaw main body, a movable jaw side constricted portion is formed along the cutting side surface of the movable jaw side cutting body, and a movable jaw side reinforcing portion is formed at a location outside the opening and closing direction of the movable jaw side constricted portion. According to the crushing cutter disclosed in this Patent Document 1, it is described that large steel frames of structures or columns made of reinforced concrete can be crushed and cut.

[0003] The utility pole crusher disclosed in Patent Document 2 includes a fixed jaw body and a movable jaw body provided in an outer casing of the crusher so as to be openable and closable. Flat fixed side crushing plates and movable side crushing plates are provided on the tip sides of the fixed jaw body and the movable jaw body so as to face each other, and the base sides of the fixed jaw body and the movable jaw body are respectively formed as substantially flat fixed side pressing surfaces and movable side pressing surfaces. Fixed side cutting blades and movable side cutting blades project from substantially the center in the width direction of the fixed side pressing surface and the movable side pressing surface, respectively. According to the utility pole crusher disclosed in this Patent Document 2, it is described that the concrete portion of a utility pole made of reinforced concrete can be crushed extremely efficiently, and the steel bars can be cut together extremely well.

[0004] The construction machine grapple device disclosed in Patent Document 3 is a construction machine grapple device having a first claw portion and a second claw portion, wherein the first claw portion and the second claw portion are capable of opening and closing relative to each other, the first claw portion having two first cutter blades arranged in parallel at a predetermined interval, the second claw portion having two second cutter blades arranged in parallel at a predetermined interval, and the first cutter blades and the second cutter blades are arranged to slide in the direction of closing relative to each other and cut when the first claw portion and the second claw portion are closed relative to each other. Patent Document 3 states that the construction machine grapple device disclosed in Patent Document 3 can provide a construction machine grapple device that makes it easy to cut objects such as reinforcing bars and has good work efficiency. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 2891611 [Patent Document 2] Japanese Patent Publication No. 2020-90886 [Patent Document 3] Utility Model Registration No. 3236676 Gazette [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] According to the crushing and cutting machine disclosed in Patent Document 1, it is thought that the cutting work of the material to be cut can be performed efficiently using the cutting blade (cutter blade).

[0007] However, the cutting blades (cutter blades) disclosed in Patent Document 1, etc., require the entire cutting blade (cutter blade) to be replaced when they become worn or damaged, which is very costly.

[0008] In this respect, by making the cutting blade (cutter blade) a two-piece structure consisting of a cutter blade base material and a blade portion, if the blade portion wears out or breaks, only the blade portion needs to be replaced, eliminating the need to replace the cutter blade base material and thus reducing costs. However, there was a problem in that misalignment occurred at the joint between the cutter blade base material and the blade portion during cutting, causing the cutting blade (cutter blade) to break.

[0009] Therefore, in view of the above-mentioned problems, the inventors of this invention have diligently studied and developed a two-piece cutter blade that reduces maintenance costs, and in particular prevents misalignment at the joint between the cutter blade base material and the blade portion during cutting operations, thereby preventing damage to the blade portion. As a result, they have arrived at the present invention. [Means for solving the problem]

[0010] In other words, the present invention relates to a cutter blade to be attached to a construction machine attachment that is mounted on the tip of the arm of a construction machine such as a power shovel, and comprises a cutter blade base material and a blade portion, wherein the cutter blade base material and the blade portion are provided with bolt holes for joining the blade portion to the cutter blade base material with bolts, and a sleeve is disposed within the bolt holes at the joint between the cutter blade base material and the blade portion, extending from the cutter blade base material to the blade portion.

[0011] Furthermore, the cutter blade of the present invention is characterized in that the cutter blade base material is provided with mounting bolt holes for attaching the cutter blade base material to the construction machine attachment. [Effects of the Invention]

[0012] The cutter blade of the present invention is a two-piece cutter blade that reduces maintenance costs, and in particular, it prevents misalignment at the joint between the cutter blade base material and the blade portion during cutting operations, thereby preventing damage to the blade portion.

[0013] Furthermore, in the cutter blade of the present invention, by providing mounting bolt holes in the cutter blade base material for attaching the cutter blade, which is composed of the cutter blade base material and the blade portion, to a construction machinery attachment, it is possible to prepare a cutter blade with the cutter blade base material and blade portion already joined together, thereby improving the efficiency of the attachment work to the construction machinery attachment. Moreover, since the proportion of the blade portion to the entire cutter blade can be reduced, the cost of replacing the blade portion can be significantly reduced. [Brief explanation of the drawing]

[0014] [Figure 1] This is an explanatory diagram showing a cutter blade according to one embodiment of the present invention attached to a construction machine attachment. [Figure 2] (a) is a plan view of the cutter blade shown in Figure 1, (b) is a cross-sectional view of AA in (a), and (c) is a cross-sectional view of BB in (a). [Figure 3] (a) is a plan view of a cutter blade according to another embodiment of the present invention, (b) is a cross-sectional view of the CC in (a) before the blade is mounted, (c) is a cross-sectional view of the CC with the sleeve installed, (d) is a cross-sectional view of the CC with the blade installed, and (e) is a cross-sectional view of the CC with the blade fixed with bolts. [Modes for carrying out the invention]

[0015] The embodiments of the cutter blade of the present invention will be described in detail below with reference to the drawings. Figure 1 is an explanatory diagram showing a cutter blade 10 according to one embodiment of the present invention mounted on a construction machine attachment X, Figure 2(a) is a plan view of the cutter blade 10 of this embodiment, Figure 2(b) is a cross-sectional view AA in Figure 2(a), and Figure 2(c) is a cross-sectional view BB in Figure 2(a). As shown in these figures, the cutter blade 10 of this embodiment is a cutter blade that is mounted on a construction machine attachment X which is attached to the tip of the arm of a construction machine such as a power shovel, and mainly consists of a cutter blade base material 11 and a blade portion 12. The cutter blade base material 11 and the blade portion 12 of the cutter blade 10 of this embodiment have a rectangular shape in which the vertical and horizontal dimensions in their respective plan views are set to the same dimensions. In other words, the cutter blade 10 of this embodiment has a two-piece structure consisting of a cutter blade base material 11 and a blade portion 12.

[0016] Furthermore, the cutter blade base material 11 and the blade portion 12 according to this embodiment have bolt holes 13 formed in the cutter blade base material 11 for joining the blade portion 12 with bolts (not shown). These bolt holes 13 consist of a bolt hole 13a on the cutter blade base material 11 side and a bolt hole 13b on the blade portion 12 side, and these bolt holes 13a and 13b are formed to communicate with each other.

[0017] Furthermore, a sleeve 14 is provided within the joining bolt hole 13 at the joint between the cutter blade base material 11 and the blade portion 12 according to this embodiment, extending across both the cutter blade base material 11 and the blade portion 12.

[0018] More specifically, in the bolt hole 13a on the cutter blade base material 11 side, a notched step 11a is formed on the periphery of the bolt hole 13a on the side facing the blade portion 12, and in the bolt hole 13b on the blade portion 12 side, a notched step 12a is formed on the periphery of the bolt hole 13b on the side facing the cutter blade base material 11. The sleeve 14 is then placed in the space formed by placing the notched step 11a and the notched step 12a opposite each other.

[0019] When attaching the cutter blade 10 of the present embodiment to the construction machine attachment X, when the cutter blade base material 11 and the blade part 12 are overlapped, a sleeve 14 is disposed in a space formed by facing a notch step 11a formed on the periphery of the bolt hole 13a for joining of the cutter blade base material 11 and a notch step 12a formed on the periphery of the bolt hole 13b for joining of the blade part 12. With the sleeve 14 disposed, the blade part 12 is disposed at the attachment position of the cutter blade 10 related to the construction machine attachment X so as to be located on the outside. Then, when a bolt is inserted from the side of the construction machine attachment X (the side opposite to the blade part 12) toward the bolt hole 13a related to the cutter blade base material 11, the tip of the bolt reaches the bolt hole 13b related to the blade part 12 through the inside of the sleeve 14. By screwing this bolt into the bolt hole 13b related to the blade part 12, the cutter blade 10 of the present embodiment is screwed to the construction machine attachment X.

[0020] As described above, since the cutter blade 10 of the present embodiment has a two-piece structure in which only the blade part 12 can be replaced, maintenance costs can be reduced. In addition, since the sleeve 14 is disposed in the bolt hole 13 for joining related to the cutter blade 10, it is possible to prevent displacement at the joint between the cutter blade base material 11 and the blade part 12 during the cutting operation and prevent damage to the blade part 12.

[0021] Next, the cutter blade 20 according to another embodiment of the present invention shown in FIG. 3, similar to the cutter blade 10 according to the above-described embodiment, mainly includes a cutter blade base material 21 having a rectangular shape in plan view and a blade part 22 attached to the cutter blade base material 21, and is a two-piece structure. In particular, a notch part 30 is formed along the longitudinal direction of the cutter blade base material 21 related to the cutter blade 20 of the present embodiment, and the blade part 22 is formed according to the shape of the notch part 30. By joining the blade part 22 to the notch part 30 of the cutter blade base material 21, as shown in FIG. 3(e), a cutter blade 20 having a rectangular cross-sectional shape is obtained.

[0022] In this embodiment, the cutter blade base material 21 and the blade portion 22 have bolt holes 23 formed in the cutter blade base material 21 for joining the blade portion 22 with bolts 24 (see Figure 3(e)). These bolt holes 23 consist of a bolt hole 23a on the cutter blade base material 21 side and a bolt hole 23b on the blade portion 22 side, and these bolt holes 23a and 23b are formed to communicate with each other.

[0023] Furthermore, a sleeve 14 is provided within the joining bolt hole 23 at the joint between the cutter blade base material 21 and the blade portion 22 according to this embodiment, extending across both the cutter blade base material 21 and the blade portion 22.

[0024] More specifically, in the bolt hole 23a on the cutter blade base material 21 side, a notched step 21a is formed on the periphery of the bolt hole 23a on the side facing the blade portion 22, and in the bolt hole 23b on the blade portion 22 side, a notched step 22a is formed on the periphery of the bolt hole 23b on the side facing the cutter blade base material 21. The sleeve 14 is then placed in the space formed by placing the notched step 21a and the notched step 22a opposite each other.

[0025] Herein, the cutter blade base material 21 of the cutter blade 20 of this embodiment is characterized by having mounting bolt holes 25 for attaching the cutter blade 20, which is composed of the cutter blade base material 21 and the blade portion 22, to a construction machine attachment X.Therefore, when attaching the cutter blade 20 of this embodiment to a construction machine attachment X, it is possible to join the cutter blade base material 21 and the blade portion 22 in advance with the sleeve 14 in place.

[0026] Specifically, the sleeve 14 is placed in the notched step 21a of the cutter blade base material 21 shown in Figure 3(b) (Figure 3(c)). Next, the blade portion 22 is positioned so that the notched step 22a formed on the periphery of the joining bolt hole 23b of the blade portion 22 faces the notched step 21a, so that the sleeve 14 is placed within the joining bolt hole 23 at the joint between the cutter blade base material 21 and the blade portion 22, spanning both the cutter blade base material 21 and the blade portion 22 (Figure 3(d)). Then, a bolt 24 is inserted from the joining bolt hole 23a of the cutter blade base material 21 through the sleeve 14 toward the joining bolt hole 23b of the blade portion 22, and this bolt 24 is screwed into the joining bolt hole 23b, thereby joining the cutter blade portion 22 to the cutter blade base material 21, and a cutter blade 20 is obtained in which the sleeve 14 is placed at the joint between the cutter blade base material 21 and the blade portion 22.

[0027] When attaching the cutter blade 20 of this embodiment to the construction machine attachment X, the cutter blade 20 is positioned at the mounting position of the construction machine attachment X such that the blade portion 22 is facing outwards. A bolt is inserted from the construction machine attachment X side (opposite side of the blade portion 22) toward the mounting bolt hole 25 formed in the cutter blade base material 21 related to the cutter blade 20, and this bolt is screwed into the mounting bolt hole 25, thereby screwing the cutter blade 20 of this embodiment onto the construction machine attachment X.

[0028] As described above, the cutter blade 20 of this embodiment also has a two-piece structure in which only the blade portion 22 can be replaced, thus reducing maintenance costs. Furthermore, since the sleeve 14 is disposed within the joining bolt hole 23 related to the cutter blade 20, misalignment at the joint between the cutter blade base material 21 and the blade portion 22 during cutting operations can be prevented, thereby preventing damage to the blade portion 22.

[0029] Furthermore, in this embodiment, the cutter blade 20 is provided with mounting bolt holes 25 in the cutter blade base material 21 for attaching the cutter blade 20 to the construction machine attachment X. Therefore, a cutter blade 20 with the blade portion 22 already attached to the cutter blade base material 21 can be prepared in advance, improving the efficiency of the attachment work to the construction machine attachment X. Moreover, since the proportion of the blade portion 22 to the entire cutter blade 20 can be reduced, the replacement cost of the blade portion 22 can be significantly reduced.

[0030] Although embodiments of the cutter blade of the present invention have been described in detail above, these embodiments should not be interpreted as substantially limiting the technical idea of ​​the present invention. For example, although the cutter blades 10 and 20 according to the embodiments of the present invention are rectangular in plan view, the plan view shape of the cutter blade of the present invention is not limited to a rectangular shape, and may be, for example, an inverted V shape or a curved shape, depending on the shape of the attachment for construction machinery. The present invention can be implemented with appropriate improvements, modifications, or additions by those skilled in the art, without departing from its essence, through their ingenuity and creativity. [Explanation of Symbols]

[0031] 10, 20: Cutter blades 11, 21: Cutter blade base material 11a, 12a, 21a, 22a: Notched step 12, 22: Blade part 13, 23: Bolt holes for joining 13a, 23a: Bolt holes for joining the cutter blade base material. 13b, 23b: Bolt holes for joining the blade section. 14: Sleeves 24: Bolt 25: Mounting bolt holes 30: Notch

Claims

1. A cutter blade that is attached to a construction machine attachment that is mounted on the end of the arm of a construction machine such as an excavator, cutter blade base material, The blade and, It consists of, The cutter blade base material and the blade portion are each provided with bolt holes for attaching the blade portion to the cutter blade base material with bolts. A notched step is formed around the periphery of the joining bolt hole on the cutter blade base material side. Other notched steps are formed around the periphery of the joining bolt hole on the blade side. By aligning the first notched step with the other notched step, a space is formed within the joining bolt hole at the joint between the cutter blade base material and the blade portion. A cutter blade characterized in that a sleeve is disposed within the aforementioned space.

2. The cutter blade according to claim 1, characterized in that the cutter blade base material is provided with mounting bolt holes for attaching the cutter blade base material to the construction machine attachment.

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