JPS5898529A - Lock bucket of power shovel - Google Patents

Abstract

PURPOSE:To increase a bend rigidity of a bucket and to smoothen an inner wall, by a method wherein an excavating front edge of a bottom plate of a bucket is formed in an angular shape with a plate, excavating blades are attached to the center and both sides, and a reinforcing plate is welded to the bottom plate at the outside of the bucket. CONSTITUTION:An approximately hexagonal plate 1a is secured to an excavating front edge of a bottom plate 1, bending in a circular arc, of a lock bucket for excavating frozen earth, the excavating edge of the bucket is formed in an angular shape M, and excavating blades 5 and 6 are attached to the top part of the angular shape M and connections to both side plates 2. Additionally, reinforcing plates 1c and 1d for reinforcing the center part and both sides of the bent bottom plate 1 and a reinforcing plate 1e for reinforcing an angular part where the bottom plate 1 is connected to the two side plates 2 are fastened together.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lock packet for use with a power shovel for excavating frozen soil or the like.

Conventionally, such a lock packet consists of a curved bottom plate having inclined plate parts at the front and rear of an arcuate curved plate part, and each side of which is closed by a side wall plate. It is common practice to fix two digging claws and a large central digging claw whose toes protrude from these, and to fix a solid reinforcing beam with a large cross-sectional area in the center of the packet by running it longitudinally along the curved bottom plate. shall be. For this reason, not only does the reinforcing beam reduce the packet capacity, but also the mud sticks to the bottom of the kerato, further reducing the packet capacity, resulting in a significant reduction in the amount of frozen soil excavated per one excavation operation.
Excavation efficiency was reduced. In order to eliminate this drawback, if a reinforcing beam with a large cross-sectional area is fixed to the outside of the packet,
Excavation resistance increases significantly, making it difficult to use with a regular power shovel.

The present invention deals with this problem by forming the front edge of the front inclined plate portion into a chevron shape, and providing excavation claws at the top and both bottoms of the chevron, respectively, and the rear surface of each of the excavation claws being an excavation piece. are fixed and protruded in parallel so as to be positioned on substantially the same plane that guides them into the packet, so as to form a reinforcing frame that transmits the bending moment due to the excavation load to the excavation claw on the top side of the chevron to the rear packet support part. The present invention is characterized in that a thick plate portion is provided on the curved bottom plate and side wall plate near the packet opening, and reinforcing strips are welded to the curved bottom plate so that the shearing force due to the excavation load can be distributed and transmitted to the packet supporting portion.

An embodiment of the present invention will be described below with reference to the drawings.

1 has inclined plate parts (
A curved bottom plate with a smooth inner surface is provided with (b) and (c), and side wall plates 2 with a smooth inner surface are welded to both sides of the bottom plate, respectively.

The front half of the front inclined plate part (b) is formed into a substantially hexagonal thick plate part 1a with a front edge formed in a chevron M, and the rear inclined plate part (/ is formed into a substantially thick plate part 1b). , a thick plate portion 2a forming the upper part of the side wall plate 2 between the front and rear thick plate portions 1a and Ib.
are fixedly connected together, and a reinforcing frame is formed by the thick plate portion.

Excavation pawl attachments 3 and 4 are welded to the top and bottom of the chevron M of the thick plate portion 1a, respectively, and excavation pawls 5 and 6 are replaceably attached to the excavation pawl attachments 6.4, respectively. The digging claws 5 and 6 form a small acute angle (preferably 10 to 15 degrees) with the thick plate portion 1a and project parallel to the thick plate portion to the outside of the packet,
Since the front edge of the thick plate portion 1a forms a chevron M, the tip of the central excavating claw 5 on the top side of the chevron protrudes more than the both digging claws 6 on the bottom side of the chevron, and the rear surface of both digging claws 5, 6 5a.

6a is located substantially on the same plane that guides the cuttings into the packet.

Further, near the front ends of the thick plate portions 2a on both sides, excavation pawl attachments 7 slightly forwardly inclined are symmetrically welded, and an excavation pawl 8 is attached to the excavation pawl attachments 7 in a replaceable manner. The excavating pawl 8 forms a rifle angle with the thick plate portion 2a and protrudes outward from the packet, but the outer surface 8a of the excavating pawl 8 is preferably substantially parallel to the side wall plate 2. It is preferable that the front edge of the thick plate portion 1a and the side lines of the thick plate portion 2a before and after the excavating claw 8 be sharpened into blade shapes as shown in the figure.

The rear packet support part is constructed by welding upper and lower beam-like reinforcing members 9゜10, which are welded between the extensions of the side wall plates 2゜2 on both sides, to the outer surface of the curved bottom plate 1, and connecting the beam-like reinforcing materials and the outer surface of the curved bottom plate. The mounting brackets 1.1.11 on both sides welded to the respective connecting pin holes 11& to the tip of the arm 12 of the power shovel,
A connecting bottle hole 11b for the packet rotation link 16 is provided. On the outer surface of the curved bottom plate 1, reinforcing strips 1c, 1d, and 1e that do not protrude outward from the outer surfaces of the thick plate portions 1a and 2a are arranged symmetrically along the curved bottom plate 1 from the thick plate portion 1a to the packet support portion. Welded on the outside. Note that 14 is a reinforcing bracket welded to the rear corner of the packet.

In the figure, reference numeral 15 indicates a swivel base of the power shovel that is rotatably mounted on the crawler traveling device 16, and 17 indicates a boom that is pivoted 18 on the swivel base 15 and is lifted up and down by the boom cylinder 9. The packet 22 of the present invention is pivoted 26 at the tip of the arm 12 which is pivoted 20 at the tip of the arm cylinder 21 and rotated by the arm cylinder 21.
packet cylinder 25 via link 24 cooperating with 6
The rotation of the packet 22 is the same as before.

When excavating hard ground G such as frozen ground, by rotating the power shovel arm at the tip of the poom pivot shaft 18 or the arm pivot shaft 20 as a unit around the pivot shaft 18 or the arm pivot shaft 20. , the excavation claw 5°6.8 is attached to the ground G or G'
4 and 6. In this case, when the leading central digging claw 5 bites into the ground, the rear surface 5a
Since the subsequent digging claws 6 on both sides bite into the cracks in the ground that are widened by the raking action of the excavated soil mass, and the excavation claws 8 on both sides cut both ends of the excavated soil mass, the excavated pieces are smoothly inserted into the packet 22. be guided by.

In the present invention, when the central excavating pawl 5 digs into the ground G in advance, the bending moment due to the excavation load applied to the central excavating pawl is mainly transmitted to the packet support portion (9, 10°) through the reinforcing frame (1a2a, 1b). 11), and the shearing force acting on the front thick plate portion 1a is mainly transmitted to the reinforcing strip 1c.
, 1d, and 1e are distributed to the packet support portion through the thin plate portion of the curved bottom plate 1, and together with the increasing bending rigidity of the thin plate component of the packet, It has the advantage that it can sufficiently withstand brittle fracture in the conventional rock packet, and there is no risk that the packet capacity will be substantially reduced due to reinforcement beams with a large cross-sectional area, and there is no risk that the packet excavation resistance will increase significantly. .

In the illustrated embodiment, the thick plate portion and reinforcing strips forming the reinforcing frame are made to protrude outside the packet to smooth the inner wall of the packet and prevent mud from adhering to the inner wall of the packet as much as possible. This is to reduce the frictional resistance between the outer surface of the packet and the frozen soil.

[Brief explanation of the drawing]

Fig. 1 is a side view, Fig. 2 is a plan view, Fig. 3 is a view taken in the direction of arrow A in Fig. 1, Fig. 4 is a longitudinal side view during excavation, Fig. 5
The figures are a sectional view taken along the line BB in FIG. 4, and FIG. 6 is a side view showing the excavation state. 1... Curved bottom plate, 1a, 1b... Thick plate portion, 1c. 1d, 1e... Reinforcement strip, 2... Side wall plate, 2a...
Thick plate part, 5, 6...Drilling claw, (9, 10, 11)
...Packet support part. -tLIL 10 47 +611]

Claims (3)

[Claims] (1) In a power shovel packet in which both sides of a curved bottom plate are closed with side wall plates, the front edge of the front inclined plate part is formed into a chevron shape, and the front edge of the front inclined plate part is formed into a chevron shape. Excavation pawls are fixed to the top of the chevron and the bottoms of both sides thereof, protruding parallel to each other so that the rear surfaces of the respective digging pawls are located on substantially the same plane that guides the excavated pieces into the packet, and the digging pawls on the top side of the chevron are fixed. In order to form a reinforcing frame that transmits the bending moment caused by the excavation load to the rear packet support part, a thick plate part is provided on the curved bottom plate and side wall plate near the packet opening, and the shear force due to the excavation load is A lock packet for a power shovel characterized by reinforcing strips welded to a curved bottom plate to enable distributed transmission to the packet support portion. (2) A lock packet for a shovel according to claim (1), wherein a thick plate portion forming a reinforcing frame and reinforcing strips are made to protrude outside the packet so as to smooth the inner wall of the packet. (3) A lock packet 0 for a work shovel according to claim 1 or 2, wherein the thick plate portion at the front end of the curved bottom plate has a substantially hexagonal shape.