Excavation bucket

Abstract

To improve workability when attaching and detaching teeth to and from an adapter of an excavation bucket.SOLUTION: An excavation bucket 9 includes: a bottom plate 10 which has a concave curved shape and forms a bottom of a soil storage section 13; a left side plate 11 and a right side plate 12 which are provided on both the right and left sides of the bottom plate 10 and form the soil storage section 13 together with the bottom plate 10; a plurality of adapters 21 which are fixed to a cutting edge 17 located on the bottom plate 10 on an opening side of the soil storage section 13; and a plurality of teeth 26 which are detachably attached to the plurality of adapters 21 and protrude from the cutting edge 17 of the bottom plate 10. The adapter 21 is provided with a bolt insertion hole 22D which penetrates in a protruding direction of the tooth 26, and the tooth 26 is provided with a bolt hole 26F which extends in the protruding direction of the tooth 26 and into which a bolt 24 inserted through the bolt insertion hole 22D is fixed.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to an excavation bucket that is equipped on a construction machine such as a hydraulic excavator and is suitably used for excavating earth and sand. [Background technology]

[0002] A hydraulic excavator is configured to include a self-propelled lower traveling body, an upper rotating body that is rotatably mounted on the lower traveling body, and a working device that is provided in front of the upper rotating body so as to be capable of being raised and lowered. The working device of a hydraulic excavator is configured with a boom, an arm, an excavation bucket, etc., and excavates soil and sand by rotating the excavation bucket at the tip of the arm.

[0003] The excavation bucket constituting the working device usually comprises a bottom plate forming the bottom of the soil storage section, left and right side plates which form the soil storage section together with the bottom plate, a number of adapters fixed to the front end of the bottom plate located on the opening side of the soil storage section, and a number of teeth detachably attached to the multiple adapters and protruding from the front end of the bottom plate. During excavation work using a hydraulic excavator, soil is excavated by the left and right side plates and the opening side of the bottom plate while the teeth of the excavation bucket are breaking up the ground, and the soil is stored in the soil storage section.

[0004] Here, the teeth attached to the adapter wear out quickly because they are in direct contact with the excavated material, and therefore need to be replaced more frequently than other components such as the adapter. For this reason, by attaching the teeth to the adapter using a mounting fixture such as a pin, it is possible to replace worn teeth.

[0005] For example, a digging bucket has been proposed in which the teeth are attached to an adapter using a bolt inserted in a direction perpendicular to the protruding direction of the teeth (Patent Document 1).Alternatively, a digging bucket has been proposed in which the teeth are attached to an adapter using a pin inserted in a direction perpendicular to the protruding direction of the teeth, and a retaining bolt is screwed into the axial end of the pin (Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility Model Registration No. 3229296 [Patent Document 2] Utility Model Registration No. 3142580 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in conventional excavation buckets, mounting fixtures such as bolts and pins are inserted and removed from the adapter and teeth in a direction perpendicular to the protruding direction of the teeth. For this reason, when replacing only the tooth located in the center among multiple teeth arranged adjacent to the front end of the bottom plate, for example, the mounting fixture inserted and removed from the tooth to be replaced interferes with the other adjacent teeth (other teeth that do not need to be replaced). For this reason, it is necessary to remove the other teeth that do not need to be replaced from the adapter in advance, and then remove the mounting fixture from the tooth to be replaced and remove the tooth from the adapter, which creates a problem of reduced workability when replacing worn teeth.

[0008] The present invention has been developed in consideration of the problems with the prior art described above, and an object of the present invention is to provide an excavation bucket that improves the ease of attaching and removing teeth from an adapter. [Means for solving the problem]

[0009] The present invention relates to an excavation bucket comprising a bottom plate having a concave curved shape and forming the bottom of a soil storage section, left and right side plates provided on both the left and right sides of the bottom plate and forming the soil storage section together with the bottom plate, a plurality of adapters fixed to the front end of the bottom plate located on the opening side of the soil storage section, and a plurality of teeth removably attached to each of the plurality of adapters and protruding from the front end of the bottom plate, wherein the adapters are provided with fastener insertion holes that penetrate in the protruding direction of the teeth, and the teeth are provided with fastener fixing portions that extend in the protruding direction of the teeth and to which fasteners inserted into the fastener insertion holes are fixed. Effect of the Invention

[0010] According to the present invention, the workability when replacing teeth can be improved. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a left side view showing a hydraulic excavator equipped with an excavation bucket according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing the excavation bucket alone. [Diagram 3] FIG. 4 is a front view of the excavation bucket as viewed from the teeth side. [Figure 4] 4 is a cross-sectional view of the adapter, teeth, etc. as viewed from the direction of arrows IV-IV in FIG. 3. [Diagram 5] FIG. 2 is an exploded perspective view showing the adapter, teeth, bolts, O-rings, etc. [Figure 6] This is an exploded perspective view showing the adapter, teeth, bolts, O-rings, etc. from different angles. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an excavation bucket according to the present invention will be described in detail below with reference to Figs. 1 to 6, taking an excavation bucket equipped on a hydraulic excavator as an example.

[0013] A hydraulic excavator 1, which is a representative example of a construction machine, includes a self-propelled crawler-type lower traveling body 2 and an upper rotating body 3 rotatably mounted on the lower traveling body 2. A working device 8, which will be described later, is provided on the front side of the upper rotating body 3 for performing work such as excavating earth and sand.

[0014] The upper rotating body 3 has a rotating frame 4 that serves as a base. The rotating frame 4 is mounted on the lower traveling body 2 so as to be able to rotate via a rotating device. A support bracket 4A that protrudes forward is provided on the front side of the rotating frame 4, and a swing post 8A of the working device 8 is supported on the support bracket 4A so as to be able to swing left and right. A counterweight 5 is provided on the rear side of the rotating frame 4, and this counterweight 5 maintains the weight balance with the working device 8.

[0015] The cab 6 is mounted on the revolving frame 4, located in front of the counterweight 5. The cab 6 defines the driver's compartment, and a driver's seat, a travel lever / pedal device, an operating lever device, etc. (none of which are shown) are provided inside the cab 6. The exterior cover 7 is mounted on the revolving frame 4, located between the counterweight 5 and the cab 6 and on the right side of the cab 6. The exterior cover 7 houses on-board equipment (none of which are shown) such as the engine, hydraulic pump, and heat exchanger mounted on the revolving frame 4.

[0016] The working device 8 is rotatably provided on the front end side of the revolving frame 4, and performs work such as excavating soil and sand. The working device 8 has a swing post 8A swingably attached to a support bracket 4A of the revolving frame 4, a boom 8B rotatably attached to the swing post 8A, an arm 8C rotatably attached to the tip of the boom 8B, a bucket link 8D rotatably attached to the tip side of the arm 8C, and an excavation bucket 9 (described below) rotatably attached to the tip of the arm 8C and the bucket link 8D.

[0017] The working device 8 also includes a boom cylinder 8E provided between the swing post 8A and the boom 8B, an arm cylinder 8F provided between the boom 8B and the arm 8C, and a bucket cylinder 8G provided between the arm 8C and the bucket link 8D. The boom 8B rotates in response to the expansion and contraction of the boom cylinder 8E, the arm 8C rotates in response to the expansion and contraction of the arm cylinder 8F, and the excavation bucket 9 rotates in response to the expansion and contraction of the bucket cylinder 8G. A swing cylinder (not shown) that swings the swing post 8A in the left-right direction is provided between the revolving frame 4 and the swing post 8A.

[0018] Next, the excavation bucket 9 according to this embodiment will be described.

[0019] The excavation bucket 9 is rotatably attached to the tip of an arm 8C constituting the working device 8. The excavation bucket 9 excavates the ground or the like, scoops up soil and sand, and discharges the scooped up soil and sand to a desired disposal location. As shown in Figures 2 and 3, the excavation bucket 9 is configured to include a bottom plate 10, a left side plate 11, a right side plate 12, an attachment bracket 18, a plurality of adapters 21, and a plurality of teeth 26.

[0020] The bottom plate 10 constitutes the bottom of the excavation bucket 9. The bottom plate 10 is formed into a concave curved shape having a U-shaped cross section as a whole by bending a steel plate material. A left side plate 11 is fixed to the left end of the bottom plate 10, and a right side plate 12 is fixed to the right end of the bottom plate 10. The space surrounded by the bottom plate 10, the left side plate 11, and the right side plate 12 becomes the soil storage section 13 of the excavation bucket 9, and the bottom plate 10 forms the bottom of the soil storage section 13. A cutting edge 17, which will be described later, is provided on the bottom plate 10 on the opening side of the soil storage section 13.

[0021] The left side plate 11 is fixed to the left end of the bottom plate 10. The right side plate 12 is fixed to the right end of the bottom plate 10. The left side plate 11 and the right side plate 12 are formed of steel plate material into a shape corresponding to the concave curved shape of the bottom plate 10, for example, a substantially semicircular flat plate shape. The left side plate 11 and the right side plate 12 are fixed to the left and right ends of the bottom plate 10 by means of welding or the like, facing each other with a certain distance between them in the left and right directions across the bottom plate 10. As a result, the left side plate 11 and the right side plate 12 form the soil storage section 13 of the excavation bucket 9 together with the bottom plate 10.

[0022] The left side edge 14 is fixed integrally to the left side plate 11. The left side edge 14 is formed in a rectangular flat plate shape using a steel plate material that is thicker than the left side plate 11, and is welded to the opening side of the soil storage section 13 of the left side plate 11. As a result, the left side edge 14 constitutes the front end portion of the left side plate 11 that is the opening side of the soil storage section 13. The right side edge 15 is fixed integrally to the right side plate 12. The right side edge 15 is formed in a rectangular flat plate shape using a steel plate material that is thicker than the right side plate 12, and is welded to the opening side of the soil storage section 13 of the right side plate 12. As a result, the right side edge 15 constitutes the front end portion of the right side plate 12 that is the opening side of the soil storage section 13. One longitudinal end of the left side edge 14 and the right side edge 15 is fixed to the left end and right end of the cutting edge 17, respectively, and the other longitudinal end of the left side edge 14 and the right side edge 15 is connected by a cylindrical reinforcing member 16 extending in the left-right direction.

[0023] The cutting edge 17 is located between the left side edge 14 and the right side edge 15 and is integrally provided with the bottom plate 10. The cutting edge 17 constitutes the front end of the bottom plate 10 that is the opening side of the soil storage section 13. The cutting edge 17 is formed in a rectangular flat plate shape using a steel plate material thicker than the bottom plate 10, and is welded to the edge of the opening side of the bottom plate 10 and extends in the left-right direction. Both ends of the cutting edge 17 in the left-right direction are welded to one end of the left side edge 14 and the right side edge 15. A plurality of adapters 21 and a plurality of teeth 26, which will be described later, are arranged at the front end of the cutting edge 17.

[0024] The left and right mounting brackets 18 are fixed to the left-right intermediate portion of the reinforcing member 16 and to the rear surface of the bottom plate 10. The left and right mounting brackets 18 are rotatably pin-connected to the tip of the arm 8C and the bucket link 8D, respectively. As a result, the excavation bucket 9 is connected to the arm 8C and the bucket link 8D, and rotates at the tip of the arm 8C in response to the extension and retraction of the bucket cylinder 8G.

[0025] The left side cutter 19 is detachably attached to one end of the left side edge 14. The right side cutter 20 is detachably attached to one end of the right side edge 15. The left side cutter 19 and the right side cutter 20 are each formed into a polygonal plate shape using steel plate material or the like. The left side cutter 19 protrudes forward from the front end of the left side edge 14 and breaks down the hard ground, etc., before the left side edge 14. The right side cutter 20 protrudes forward from the front end of the right side edge 15 and breaks down the hard ground, etc., before the right side edge 15.

[0026] Next, the multiple adapters 21 and teeth 26 attached to the cutting edge 17 that constitutes the front end of the bottom plate 10 will be described.

[0027] A plurality of adapters 21 (for example, four) are fixed to the front end of the bottom plate 10, i.e., the cutting edge 17, which is the opening side of the soil storage section 13, by means of press fitting or the like. The plurality of adapters 21 are disposed at equal intervals in the left-right direction along the front edge of the cutting edge 17. As shown in Figures 4 to 6, the adapter 21 includes a bottom plate fixing member 22 fixed to the cutting edge 17, which is the front end of the bottom plate 10, and a fitting projection 23 protruding from the front end side of the bottom plate fixing member 22, and is integrally formed by, for example, casting.

[0028] The bottom plate fixing member 22 of the adapter 21 has a U-shaped cross section, and is press-fitted and fixed to the cutting edge 17 with the front edge of the cutting edge 17 sandwiched in the plate thickness direction. The bottom plate fixing member 22 has an inner fixing part 22A arranged on the side of the soil storage section 13 with the cutting edge 17 in between, and an outer fixing part 22B arranged on the outside of the soil storage section 13. A rectangular tooth mounting part 22C is formed on the front end side of the bottom plate fixing member 22, and a rectangular fitting hole bottom 26D of the tooth 26, which will be described later, abuts against the tooth mounting part 22C with a rectangular fitting hole 26C of the tooth 26 inserted therethrough.

[0029] The bolt insertion hole 22D as a fastener insertion hole is provided in the outer fixing portion 22B and the fitting protrusion 23 of the bottom plate fixing member 22. Therefore, the bolt insertion hole 22D is disposed outside the soil storage portion 13 in a state in which the adapter 21 is fixed to the cutting edge 17. The bolt insertion hole 22D penetrates in the direction in which the teeth 26 protrude from the cutting edge 17 (the protruding direction of the teeth 26). A bolt 24 as a fastener is inserted into the bolt insertion hole 22D, and the teeth 26 are detachably attached to the adapter 21 using this bolt 24.

[0030] The pair of bolt protection members 22E are provided on the outer fixing portion 22B of the bottom plate fixing member 22. The bolt protection member 22E is formed of a pair of plates facing each other in the left-right direction at a certain interval, and holds the head 24A of the bolt 24 inserted into the bolt insertion hole 22D from the left-right direction. This prevents rocks and the like from colliding with the head 24A of the bolt 24 during excavation work using the excavation bucket 9, and protects the bolt 24.

[0031] The fitting protrusion 23 of the adapter 21 is provided on the tooth mounting portion 22C of the bottom plate fixing member 22. The fitting protrusion 23 is formed of an elliptical cylinder having an elliptical cross-sectional shape, and protrudes forward from the tooth mounting portion 22C. An elliptical fitting hole 26E of the tooth 26 described below fits into the fitting protrusion 23. A bolt insertion hole 22D that penetrates in the protruding direction of the tooth 26 is formed in the outer fixing portion 22B of the bottom plate fixing member 22 and the fitting protrusion 23.

[0032] Seal groove 23A is formed around the entire outer circumferential surface of fitting projection 23. Seal groove 23A holds an O-ring 25. O-ring 25 provides a seal between the inner circumferential surface of elliptical fitting hole 26E formed in tooth 26 and the outer circumferential surface of fitting projection 23, preventing water, dust, etc. from entering elliptical fitting hole 26E.

[0033] The multiple teeth 26 are detachably attached to each of the multiple adapters 21 using bolts 24. The teeth 26 have a tapered wedge shape with a tip 26B that is thinner than the thickness of a base end 26A (cutting edge 17 side), and are formed by casting, for example. Inside the teeth 26, a rectangular fitting hole 26C, an elliptical fitting hole 26E, a bolt hole 26F, etc. are provided.

[0034] The rectangular fitting hole 26C is provided in the base end 26A of the tooth 26. The rectangular fitting hole 26C is open on the side of the base end 26A of the tooth 26 and is formed as a rectangular bottomed hole corresponding to the tooth mounting portion 22C of the adapter 21 (bottom plate fixing member 22). The rectangular fitting hole 26C fits into the tooth mounting portion 22C of the adapter 21, and the rectangular hole bottom 26D of the rectangular fitting hole 26C abuts against the front end of the tooth mounting portion 22C. This positions the tooth 26 with respect to the adapter 21.

[0035] An elliptical fitting hole 26E serving as a fitting hole is provided on the base end 26A side of the tooth 26. The elliptical fitting hole 26E is open on the side of the rectangular fitting hole 26C of the tooth 26, and is formed as an elliptical bottomed hole corresponding to the fitting protrusion 23 of the adapter 21. The elliptical fitting hole 26E fits into the fitting protrusion 23 of the adapter 21. This prevents the tooth 26 from rotating relative to the adapter 21 while the tooth 26 is attached to the adapter 21.

[0036] A bolt hole (internal thread hole) 26F serving as a fastener fixing portion is formed in an elliptical hole bottom 26G of the elliptical fitting hole 26E. A bolt 24 inserted through a bolt insertion hole 22D of the adapter 21 (outer fixing portion 22B and fitting protrusion 23) is screwed into the bolt hole 26F. That is, with the rectangular fitting hole 26C and the elliptical fitting hole 26E of the tooth 26 fitted into the tooth mounting portion 22C and fitting protrusion 23 of the adapter 21, the bolt 24 inserted through the bolt insertion hole 22D of the adapter 21 is screwed into the bolt hole 26F of the tooth 26, thereby attaching the tooth 26 to the adapter 21.

[0037] 4, bolt hole 26F of tooth 26 is positioned eccentrically in the long axis direction by dimension A from the center of elliptical fitting hole 26E, and bolt insertion hole 22D of adapter 21 is positioned eccentrically in the long axis direction by dimension A from the center of elliptical fitting protrusion 23. Therefore, by aligning bolt hole 26F of tooth 26 with bolt insertion hole 22D of adapter 21, the direction when fitting elliptical fitting hole 26E of tooth 26 into fitting protrusion 23 of adapter 21 can be determined, preventing incorrect assembly of tooth 26.

[0038] The notch 26H is provided on the outer periphery of the base end 26A of the tooth 26 attached to the tooth attachment portion 22C of the adapter 21. The notch 26H is formed as a groove extending from the outer periphery of the base end 26A of the tooth 26 to the rectangular fitting hole 26C, and communicates with the elliptical fitting hole 26E via the rectangular fitting hole 26C. The notch 26H discharges water, fine dust, etc. that has entered the rectangular fitting hole 26C and the elliptical fitting hole 26E of the tooth 26 to the outside of the tooth 26. This prevents the tooth 26 from adhering to the adapter 21 due to dust, etc. that has entered the rectangular fitting hole 26C and the elliptical fitting hole 26E.

[0039] The excavation bucket 9 according to this embodiment has the configuration as described above, and when performing excavation work of earth and sand using the hydraulic excavator 1 equipped with the excavation bucket 9, the teeth 26 are attached to each of the multiple adapters 21 using the bolts 24. Then, the boom 8B, arm 8C, etc. of the working device 8 are rotated so that the teeth 26 of the excavation bucket 9 are directed toward the ground, and the excavation bucket 9 is lowered.

[0040] As a result, the excavation bucket 9 breaks down the ground with the multiple teeth 26, and excavates soil with the left side edge 14, the right side edge 15, and the cutting edge 17. In this state, the excavated soil is scooped up by rotating the excavation bucket 9 and stored in the soil storage section 13. When the soil is stored in the soil storage section 13 of the excavation bucket 9, the hydraulic excavator 1 changes direction to a desired soil discharge location, for example, by rotating the upper rotating body 3. In this state, the soil stored in the soil storage section 13 of the excavation bucket 9 can be discharged to a desired soil discharge location by rotating the boom 8B, the arm 8C, and the excavation bucket 9.

[0041] When the hydraulic excavator 1 is used to excavate earth and sand, the teeth 26 attached to the excavation bucket 9 come into direct contact with the excavated material. For this reason, the teeth 26 wear out quickly and need to be replaced more frequently than other members such as the cutting edge 17 and the adapter 21. Therefore, in this embodiment, the workability when replacing worn teeth 26 with new teeth 26 can be improved, and the replacement work of the teeth 26 will be described below.

[0042] When removing the worn tooth 26 from the adapter 21, a tool such as a wrench is inserted between a pair of bolt protection members 22E provided on the outer fixing portion 22B of the adapter 21, and the head 24A of the bolt 24 is rotated. This causes the bolt 24 to disengage from the bolt hole 26F of the tooth 26, making the tooth 26 removable from the fitting protrusion 23 of the adapter 21. In this manner, with the bolt 24 disengaged from the bolt hole 26F of the tooth 26, the elliptical fitting hole 26E and the rectangular fitting hole 26C of the tooth 26 can be removed from the fitting protrusion 23 and the tooth mounting portion 22C of the bottom plate fixing member 22, allowing the worn tooth 26 to be removed from the adapter 21.

[0043] Here, in the excavation bucket 9, the bolt insertion hole 22D formed in the bottom plate fixing member 22 of the adapter 21 and the bolt hole 26F of the tooth 26 extend in the protruding direction of the tooth 26 (the direction in which the tooth 26 protrudes from the cutting edge 17). Therefore, the bolt 24 can be removed in the protruding direction of the tooth 26. Therefore, unlike the conventional technology, when the attachment tool for attaching the tooth to the adapter is removed in a direction perpendicular to the protruding direction of the tooth (left and right direction), there is no problem that the attachment tool interferes with other adjacent teeth (other teeth that do not need to be replaced), and there is no need to remove the other adjacent teeth from the adapter in advance. As a result, in this embodiment, it is possible to eliminate the need for a complicated task of removing the tooth 26 that does not need to be replaced from the adapter 21, and only the worn tooth 26 can be quickly removed from the adapter 21. Furthermore, because the teeth 26 are attached to and detached from the adapter 21 using the bolts 24, it is possible to eliminate the need for the complicated task of striking a pin with a hammer or the like when replacing the teeth, as compared to a structure in which the teeth are attached to the adapter using, for example, a pin.

[0044] Furthermore, the bolt insertion hole 22D through which the bolt 24 is inserted is formed in the outer fixing portion 22B of the bottom plate fixing member 22 that is disposed outside the soil storage portion 13 across the cutting edge 17, and in the fitting projection 23. Therefore, when removing the bolt 24 from the bolt hole 26F of the tooth 26, the worker can secure a large working space outside the soil storage portion 13 of the excavation bucket 9. As a result, the workability when removing the worn tooth 26 from the adapter 21 can be further improved.

[0045] After removing the worn tooth 26 from the adapter 21, a new tooth 26 is attached to the adapter 21. That is, with the O-ring 25 attached to the seal groove 23A of the fitting projection 23, the bolt hole 26F of the tooth 26 is aligned with the bolt insertion hole 22D of the adapter 21, and the elliptical fitting hole 26E of the tooth 26 is fitted into the fitting projection 23 of the adapter 21. Furthermore, the rectangular fitting hole 26C of the tooth 26 is fitted into the tooth mounting portion 22C of the bottom plate fixing member 22, and the rectangular hole bottom 26D of the tooth 26 is abutted against the front end of the tooth mounting portion 22C.

[0046] In this case, bolt hole 26F of tooth 26 is offset by dimension A in the long axis direction from the center of elliptical fitting hole 26E, and bolt insertion hole 22D of adapter 21 is offset by dimension A in the long axis direction from the center of elliptical fitting protrusion 23 (see FIG. 4). Therefore, by aligning bolt hole 26F of tooth 26 with bolt insertion hole 22D of adapter 21, the direction when fitting elliptical fitting hole 26E of tooth 26 into fitting protrusion 23 of adapter 21 can be determined, preventing incorrect assembly of tooth 26. Furthermore, by fitting elliptical fitting hole 26E of tooth 26 into fitting protrusion 23 of adapter 21, tooth 26 can be prevented from rotating relative to adapter 21, and tooth 26 can be maintained in the correct position.

[0047] After fitting the elliptical fitting hole 26E and the rectangular fitting hole 26C of the new tooth 26 with the fitting protrusion 23 and the tooth mounting portion 22C of the bottom plate fixing member 22, the bolt 24 is inserted into the bolt insertion hole 22D of the bottom plate fixing member 22 and the bolt 24 is screwed into the bolt hole 26F of the tooth 26. In this way, the new tooth 26 can be attached to the adapter 21 in place of the worn tooth 26.

[0048] Even when a new tooth 26 is attached to the adapter 21 using the bolt 24, the bolt 24 advances in the protruding direction of the tooth 26 and is screwed into the bolt hole 26F of the tooth 26. Therefore, the tooth 26 can be quickly attached to the adapter 21 using the bolt 24 without the bolt 24 coming into contact with another adjacent tooth 26. In addition, the head 24A of the bolt 24 is covered in a state where it is sandwiched from the left and right by a pair of bolt protection members 22E provided on the outer fixing portion 22B of the bottom plate fixing member 22. As a result, the bolt protection members 22E prevent rocks and the like from colliding with the head 24A of the bolt 24 during excavation work using the excavation bucket 9, and the bolt 24 can be protected.

[0049] Furthermore, an O-ring 25 is attached to seal groove 23A formed on the outer circumferential surface of fitting projection 23, and O-ring 25 seals between the inner circumferential surface of elliptical fitting hole 26E of tooth 26 and the outer circumferential surface of fitting projection 23. This prevents water, dust, etc. from entering elliptical fitting hole 26E by O-ring 25, thereby preventing rusting of bolt 24, etc. Also, a notch 26H is provided on the outer circumferential edge of base end 26A of tooth 26 attached to tooth attachment portion 22C of adapter 21, and notch 26H communicates with elliptical fitting hole 26E via rectangular fitting hole 26C. This allows water, fine dust, etc. that has entered the rectangular fitting hole 26C and the elliptical fitting hole 26E of the tooth 26 to be discharged to the outside of the tooth 26 through the cutout portion 26H, preventing the tooth 26 from becoming stuck to the adapter 21 due to dust, etc. that has entered the rectangular fitting hole 26C and the elliptical fitting hole 26E.

[0050] Thus, the excavation bucket 9 in the embodiment comprises a bottom plate 10 having a concave curved shape and forming the bottom of the soil storage section 13, a left side plate 11 and a right side plate 12 provided on both the left and right sides of the bottom plate 10 and forming the soil storage section 13 together with the bottom plate 10, a plurality of adapters 21 fixed to a cutting edge 17 located on the opening side of the soil storage section 13 of the bottom plate 10, and a plurality of teeth 26 removably attached to the plurality of adapters 21 and protruding from the cutting edge 17 of the bottom plate 10, the adapter 21 being provided with a bolt insertion hole (fastener insertion hole) 22D that penetrates in the protruding direction of the tooth 26, and the tooth 26 being provided with a bolt hole (fastener fixing portion) 26F that extends in the protruding direction of the tooth 26 and into which a bolt (fastener) 24 inserted into the bolt insertion hole 22D is fixed.

[0051] With this configuration, the tooth 26 can be attached to the adapter 21 by threading the bolt 24 inserted through the bolt insertion hole 22D of the adapter 21 into the bolt hole 26F of the tooth 26. In this case, the bolt 24 is inserted and removed from the tooth 26 and the adapter 21 in the direction in which the tooth 26 protrudes. As a result, for example, when replacing one tooth 26 out of multiple teeth 26, only the tooth 26 to be replaced can be removed and attached to the adapter 21 without removing the other adjacent teeth 26 from the adapter 21. As a result, the workability when replacing the tooth 26 can be improved.

[0052] In the embodiment, the bolt insertion holes 22D are disposed outside the soil storage portion 13 with the adapter 21 fixed to the cutting edge 17 of the bottom plate 10. With this configuration, a large working space can be secured outside the soil storage portion 13 of the excavation bucket 9 when attaching and detaching the teeth 26 to and from the adapter 21. As a result, the workability when attaching and detaching the teeth 26 to and from the adapter 21 can be further improved.

[0053] In the embodiment, tooth 26 is provided with a bottomed elliptical fitting hole 26E with bolt hole 26F formed in elliptical hole bottom 26G, and adapter 21 is provided with fitting protrusion 23 with bolt insertion hole 22D formed therein that fits into elliptical fitting hole 26E of tooth 26. With this configuration, tooth 26 can be attached to adapter 21 in a non-rotatable state, and tooth 26 can be maintained in the appropriate position.

[0054] In the embodiment, bolt hole 26F is formed at a position eccentric to the center of elliptical fitting hole 26E, and bolt insertion hole 22D is formed at a position eccentric to the center of fitting protrusion 23. With this configuration, by aligning bolt hole 26F of tooth 26 with bolt insertion hole 22D of adapter 21, the direction when elliptical fitting hole 26E of tooth 26 is fitted into fitting protrusion 23 of adapter 21 can be determined, and incorrect assembly of tooth 26 can be prevented.

[0055] In this embodiment, a seal groove 23A that holds an O-ring 25 that prevents water from entering elliptical fitting hole 26E is provided on the outer circumferential surface of fitting projection 23. With this configuration, when tooth 26 is attached to adapter 21, O-ring 25 prevents water, dust, etc. from entering elliptical fitting hole 26E of tooth 26, thereby preventing rusting of bolt 24, etc.

[0056] In this embodiment, elliptical fitting hole 26E of tooth 26 and fitting projection 23 of adapter 21 have elliptical cross-sectional shapes that allow them to fit together. With this configuration, tooth 26 can be prevented from rotating relative to adapter 21 while attached to fitting projection 23, and the position of tooth 26 relative to adapter 21 can be properly maintained.

[0057] In this embodiment, the outer periphery of the portion of tooth 26 that is attached to adapter 21 is provided with cutout 26H that communicates with elliptical fitting hole 26E. This configuration allows water, fine dust, etc. that has entered square fitting hole 26C and elliptical fitting hole 26E of tooth 26 to be discharged to the outside of tooth 26 through cutout 26H. As a result, tooth 26 can be prevented from adhering to adapter 21 due to dust, etc. that has entered square fitting hole 26C and elliptical fitting hole 26E.

[0058] In the embodiment, the fastener is a bolt 24, and the adapter 21 is provided with a bolt protection member 22E that protects the head 24A of the bolt 24 inserted into the bolt insertion hole 22D. According to this configuration, during excavation work using the excavation bucket 9, the bolt protection member 22E prevents rocks and the like from colliding with the head 24A of the bolt 24, thereby protecting the bolt 24.

[0059] In the embodiment, the fitting protrusion 23 of the adapter 21 is formed by an elliptical cylinder having an elliptical cross-sectional shape, and the elliptical fitting hole 26E of the tooth 26 is formed as an elliptical bottomed hole corresponding to the fitting protrusion 23. However, the present invention is not limited to this, and the fitting protrusion of the adapter may be formed by a cylinder having a circular cross-sectional shape, and the fitting hole of the tooth may be formed as a circular fitting hole. Also, the fitting protrusion of the adapter may be formed by a prismatic body having a polygonal cross-sectional shape such as a rectangle, and the fitting hole of the tooth may be formed as a polygonal fitting hole. [Explanation of symbols]

[0060] 9. Excavation Bucket 10 Bottom plate 11 Left side plate 12 Right side plate 13 Soil storage section 17 Cutting edge (front end) 21 Adapter 22 Bottom plate fixing member 22B Outside fixed part 22D Bolt insertion hole (fastener insertion hole) 22E Bolt protection material 23 Fitting protrusion 23A Seal groove 24 Bolts (fasteners) 24A Head 25 O-ring 26 Tooth 26E Oval fitting hole (fitting hole) 26F Bolt hole (fastener fixing part) 26G oval hole bottom (hole bottom) 26H Notch

Claims

1. An excavation bucket comprising a bottom plate having a concave curved shape and forming a bottom of a soil storage section, left and right side plates provided on both the left and right sides of the bottom plate and forming the soil storage section together with the bottom plate, a plurality of adapters fixed to a front end portion of the bottom plate located on the opening side of the soil storage section, and a plurality of teeth detachably attached to each of the plurality of adapters and protruding from the front end portion of the bottom plate, The adapter is provided with a fastener insertion hole penetrating in a protruding direction of the tooth, An excavation bucket characterized in that the teeth are provided with fastener fixing portions extending in the protruding direction of the teeth and to which fasteners inserted into the fastener insertion holes are fixed.

2. The excavation bucket according to claim 1 , wherein the fastener insertion hole is disposed outside the soil storage portion when the adapter is fixed to the front end portion of the bottom plate.

3. The tooth is provided with a bottomed fitting hole in which the fastener fixing portion is formed at the bottom of the hole, The excavation bucket according to claim 1 , wherein the adapter is provided with a fitting protrusion which fits into the fitting hole of the tooth and has the fastener insertion hole formed therein.

4. The fastener fixing portion is formed at a position eccentric from the center of the fitting hole, The excavation bucket according to claim 3 , wherein the fastener insertion hole is formed at a position eccentric to the center of the fitting projection.

5. 4. The excavation bucket according to claim 3, wherein a seal groove for holding an O-ring for preventing water from entering the fitting hole is provided on an outer circumferential surface of the fitting projection.

6. 4. The excavation bucket according to claim 3, wherein the fitting holes of the teeth and the fitting projections of the adapter have elliptical cross-sectional shapes that allow them to fit together.

7. 4. The excavation bucket according to claim 3, wherein a notch communicating with the fitting hole is provided on an outer periphery of the tooth at a portion attached to the adapter.

8. the fastener is a bolt; The excavation bucket according to claim 1 , wherein the adapter is provided with a bolt protection member that protects a head of the bolt inserted into the fastener insertion hole.

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