JP6676012B2 - Attachment with bucket and fork - Google Patents

Description

  The present invention relates to an attachment to be used by attaching to a power shovel in construction work and civil engineering work.Specifically, a bucket for use in excavation of the ground or demolition of a building, and for grasping materials, wood, etc. And an attachment having a fork.

  Attachments to be attached to power shovels for construction work and civil engineering work have conventionally been put into practical use, and a suitable attachment is selected according to the content of the work, and the attachment is used as a power shovel arm. Attach to and carry out construction. For example, a box-shaped attachment called a bucket (for example, Patent Literature 1) is used to perform excavation work and earth unloading work. In addition, when carrying a transport operation while grasping a material, wood, or the like, a claw-shaped attachment called a fork (for example, Patent Document 2) is used.

  After carrying out excavation and unloading work using these attachments, when carrying out the work of transporting materials and timber, first attach the bucket to the arm at the construction site, then perform the work. Attachment replacement work that removes and attaches a fork occurs. Since all of these attachments are heavy, the replacement operation takes a long time and various safety measures need to be taken. As a result, problems such as an extension of the construction period, a decrease in work efficiency, and an increase in construction cost occur.

  Then, in order to solve the problem of the conventional attachment as disclosed in Patent Documents 1 and 2, an attachment including a bucket and a fork (for example, Patent Documents 3, 4, and 5) has been developed.

  The attachments disclosed in Patent Literatures 3 to 5 use a bucket when performing excavation work and unloading work on the ground, and use a fork and a bucket when performing a transport work by grasping materials, wood, and the like. Can be used and grabbed. Therefore, it is not necessary to replace the attachment when carrying out the work of transporting materials and timber after performing the above-mentioned excavation work and unearthing work, so that the construction period is shortened, the work efficiency is improved, and the construction cost is reduced. Can be reduced.

  However, the attachments disclosed in Patent Literatures 3 to 5 have a configuration in which a bucket is driven by a single cylinder disposed on an arm of a power shovel, and a fork is operated following the bucket. In other words, when the bucket is operated to perform the excavation work and the unloading work of the ground, the fork and the bucket always inevitably open and close at the same time, although the fork does not need to be operated. Repeating such unnecessary operations by the fork causes problems such as (a) an increase in the load applied to the cylinder and (b) breakage of a pin serving as a rotating shaft of the fork, and as a result, Causes mechanical failures (eg damage to cylinders and forks, malfunctions, etc.).

JP 2003-306955 A JP-A-10-140853 No. JP-A-7-331688 No. JP 2004-210493 A JP 2013-133699 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an attachment which can solve the problems of the conventional technology, shorten the construction period, improve the working efficiency, reduce the construction cost, and have excellent durability.

  In order to solve the above-mentioned problems, the present inventor has studied a technique of improving an attachment provided with a bucket and a fork and individually driving the bucket and the fork. In other words, use an attachment with a bucket and fork to shorten the construction period, improve work efficiency, and reduce construction costs, and operate the fork only when necessary by driving the bucket and fork individually. Let it. As a result, a failure due to unnecessary operation can be prevented.

The present invention has been made based on such findings.
That is, the present invention relates to an attachment used by attaching to a power shovel,
A first support pin for rotatably supporting a distal end portion of an extendable rod of a first cylinder and one end of a first link disposed on an arm of the power shovel;
A second support pin for rotatably supporting the bucket on the arm;
A second link rotatably connected at one end to the first connection pin of the bucket and rotatably connected at the other end to the first support pin;
A third support pin for rotatably supporting the other end of the first link and the arm;
A fork rotatably connected to the second support pin;
A second connecting pin for rotatably supporting a fork at a tip end of a telescopic rod of a second cylinder disposed on the arm;
A bracket fixed at one end to the second support pin, fixed to the third support pin, and further rotatably disposed at the other end with a rear end of the second cylinder;
Have a,
In that the bracket is a attachment Ru provided to extend the insertion hole for inserting and fixing the third support pins in the longitudinal direction of the arm.

  ADVANTAGE OF THE INVENTION According to this invention, in the operation | work using a power shovel, it is possible to shorten the construction period, improve the work efficiency, reduce the construction cost by lowering the frequency of replacement of the attachment, and improve the durability of the attachment. It has a remarkable effect.

It is a side view which shows the example of the attachment of this invention typically. It is a side view which shows the example of the attachment for reference typically. It is a top view which shows typically the example of the bracket in FIG.

  FIG. 1 is a side view schematically showing an example of the attachment of the present invention. As shown in FIG. 1, the attachment of the present invention includes a first cylinder 3 for driving a bucket 2 of a power shovel and a second cylinder 11 for driving a fork 10. Therefore, the bucket 2 and the fork 10 can be individually driven.

First, a mechanism for driving the bucket 2 using the first cylinder 3 will be described.
The distal end of a telescopic rod 3 a of a first cylinder 3 provided on the arm 1 is connected to one end of a first link 5 via a first support pin 4. The other end of the first link 5 is connected to the arm 1 via a third support pin 9. Therefore, the first link 5 rotates about the third support pin 9 as the rod 3a expands and contracts. When the first link 5 rotates, the second link 7 connected to the first support pin 4 moves the first connection pin 6 in the longitudinal direction of the arm 1.

  The bucket 2 is disposed on the arm 1 via the second support pin 8, and rotates around the second support pin 8 as the first connection pin 6 moves. That is, the bucket 2 rotates about the second support pin 8 by extending and contracting the rod 3 a of the first cylinder 3.

Next, a mechanism for driving the fork 10 using the second cylinder 11 will be described.
One end of a bracket 12 for holding the second cylinder 11 is fixed to the second support pin 8. The bracket 12 is also fixed to the third support pins 9. Therefore, the bracket 12 is fixed at a predetermined position without rotating.

  The other end of the bracket 12 is provided with a second cylinder 11. The distal end of the extendable rod 11 a of the second cylinder 11 is connected to the fork 10 via the second connection pin 13. Thus, the fork 10 rotates about the second support pin 8 as the rod 11a expands and contracts.

  As described above, the bucket 2 and the fork 10 can be individually driven by operating the first cylinder 3 and the second cylinder 11, respectively. Therefore, when the ground excavation work or the earth unloading work is performed, the work can be performed by driving only the bucket 2 with the fork 10 held in the standby posture as shown in FIG. As a result, unnecessary movement of the fork 10 can be avoided, so that it is possible to prevent a mechanical failure from occurring during work, and as a result, excellent durability can be obtained.

  Then, when carrying out the work of transporting the material and the wood after the excavation work and the unearthing work, the bucket 2 and the fork 10 can be driven together to carry out the work. That is, since it is not necessary to replace the attachment, it is possible to shorten the construction period, improve the work efficiency, and reduce the construction cost.

Although FIG. 1 shows an example in which the second cylinder 11 is provided on the bracket 12, a projection 14 is provided on the arm 1 as shown in FIG. 2 as a reference example, and the second cylinder 11 is attached to the projection 14. In this case , the arm 1 needs to be modified in order to provide the projection 14.

On the other hand, the attachment shown in FIG. 1 fixes the bracket 12 using the second support pin 8 and the third support pin 9 which are commonly attached to various types of excavators, so that the arm 1 is not modified. It has the advantage of being usable. In addition, attachment and removal of the bracket 12 can be easily performed. Further, since the distance between the second support pin 8 and the third support pin 9 differs depending on the type of the excavator, as shown in FIG. 3, an insertion hole 16 for inserting and fixing the third support pin 9 is provided on the arm. extend in the first longitudinal direction (a so-called elongated hole) Ru provided. By doing so, one bracket 12 can be attached to any of a plurality of excavators used at a work site, and versatility is greatly improved.

The attachment shown in Figure 1 and mounted on the power shovel (body weight 12 ton), 2 pieces of Shirida (both pump pressure 35 MPa, piston diameter 95 mm, the piston surface area 7088Mm ^2, cylinder thrust 245 kN) by telescopic rods, bucket And an experiment to drive the fork.

  In the experiment, first, as Inventive Example 1, the rod of the first cylinder was extended and contracted 50 times while the fork was held in the standby posture as shown in FIG. 1, and only the bucket was driven. Next, as Inventive Example 2, the rod of the first cylinder and the rod of the second cylinder were simultaneously extended and contracted 50 times to drive the bucket and the fork.

  In each of Inventive Example 1 and Inventive Example 2, it was possible to drive smoothly without any trouble. After the experiment of Invention Example 1 was completed and the experiment of Invention Example 2 was completed, inspection of each member constituting the attachment revealed no damage or deformation.

1 arm 2 bucket 3 1st cylinder
3a Rod 4 First support pin 5 First link 6 First connection pin 7 Second link 8 Second support pin 9 Third support pin
10 forks
11 Second cylinder
11a rod
12 Bracket
13 2nd connecting pin
14 protrusion
15 Insertion hole for 2nd support pin
16 Third support pin insertion hole
17 Hole for arranging the second cylinder

Claims (1)

Attachment to be used by attaching to a power shovel,
A first support pin for rotatably supporting a distal end portion of an extendable rod of a first cylinder and one end of a first link disposed on an arm of the power shovel;
A second support pin for rotatably supporting the bucket on the arm;
A second link rotatably connected at one end to a first connection pin of the bucket and rotatably connected at the other end to the first support pin;
A third support pin for rotatably supporting the other end of the first link and the arm;
A fork rotatably connected to the second support pin, a second connecting pin for rotatably supporting the fork at a distal end of a telescopic rod of a second cylinder disposed on the arm,
A bracket having one end fixed to the second support pin and also fixed to the third support pin, and a rear end of the second cylinder rotatably disposed at the other end;
Have a,
To the bracket, the third insertion hole for fixing the support pin insert and provided to extend in the longitudinal direction of the arm attachment characterized by Rukoto.

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