JP2003176543A - Bucket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bucket used for a hydraulic shovel or the like and provided with damping structure. <P>SOLUTION: A bottom plate or a side face plate constituting the bucket is formed in sandwich structure with rubber, a synthetic resin or a damping alloy held in the middle. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic excavator, a tractor shovel, etc., and a bucket attached to a tip of a work attachment of a work vehicle.

[0002]

2. Description of the Related Art Generally, a bucket is mounted on a tip of a work attachment of a construction machine such as a hydraulic shovel or a work vehicle so that the bucket can be lifted and lowered for excavation work. As the buckets to be mounted, standard buckets with claws, large buckets for sand without claws, reinforced buckets for rocks, etc. are used depending on the application such as the type of load and the type of excavation work. The shape of the bucket body can be roughly classified into a shape including a bottom plate and both side plates and a shape including only the bottom plate.

Generally, buckets are used in excavation work, etc., but in addition to the original excavation work, the bucket is used to repeatedly make shocking collisions against hard soil, rocks, concrete or the like. It is used to destroy hard soil, rocks, concrete, etc. In addition, hard soil, rock, concrete, or the like may be shaken violently in a bucket to facilitate loading of those on a dump truck or the like. for that reason,
When the bucket impacts hard soil, rock, concrete, etc., or when these things are loaded into the bucket, or when the bucket is shaken violently after loading, the hard sand is the bottom plate of the bucket. , The side plate is struck, and a violent impact sound is generated. Also,
The impact sound causes noise by repeating resonance in the bucket body.

Conventionally, as a method of reducing noise in a construction machine, a method of attaching a vibration damping member made of a viscoelastic body such as rubber or resin to a base material of a vibrating section is known. Also,
Japanese Unexamined Patent Publication No. 2000-219168, which is related to the applicant of the present application, proposes a noise reduction device used for a construction machine. This device employs a configuration in which plates are laminated on a part or the whole of the vibration generating unit and discretely coupled at a predetermined coupling interval. When the noise generating part vibrates by discretely coupling the laminated plate to the noise generating part, a minute positional deviation or a gap occurs between the vibrating part and the laminated plates and between the laminated plates. Since these minute positional deviations and gaps are generated one after another while constantly changing, friction and collision between the plates are repeated. Therefore, the vibration energy generated in the noise generating portion is converted into heat energy due to the friction and collision, and is consumed. Therefore, it is possible to reduce the vibration generated in the noise generating section and reduce the noise.

[0005]

However, in the conventional noise reduction method, it is necessary to make the thickness of the vibration damping member 2 to 3 times or more that of the base material of the vibrating portion in order to produce an effective vibration damping effect. . Therefore, in order to avoid interference with other members, it is necessary to secure a gap of a predetermined size in the place where the vibration damping member is attached, which causes a problem of increasing the size of the device. Further, when it is used in a construction machine used outdoors, there is a problem that the applied part is not exposed to sunlight, wind and rain, and has no durability against vibration, impact and abrasion due to rocks, earth and sand, etc.

The above-mentioned noise reduction device disclosed in Japanese Unexamined Patent Publication No. 2000-219168 solves the problems associated with these conventional noise reduction methods. However, there is a problem in adopting the noise reduction device according to the publication as a bucket. It was As described above, the bucket is also used severely such as colliding with hard rock or the like to destroy the rock. The bottom plate or the side plate of the bucket has a structure capable of withstanding such shocks even if the front and back surfaces are always exposed to a severe shock due to such a severe use. Therefore, even if the laminated plates described in the above-mentioned publication are joined in a state of being exposed to the bottom plate or the side plate of the bucket, there is a problem that the laminated plates are peeled off due to an impact although the noise is reduced. The present invention is to provide a bucket that can reduce the noise generated from the bucket body even when used in a harsh environment.

[0007]

The above object can be effectively achieved by the inventions according to the claims of the present application having the following matters. That is, the invention according to claim 1 is a bucket attached to the tip of a work attachment of a construction machine or a work vehicle.
Alternatively, the bucket is characterized in that at least one of both side plates is a damping plate.

According to the present invention, since the bottom plate and / or both side plates constituting the bucket body are composed of damping plates, the damping material damps the impact sound even if the bucket collides with rocks or the like. Since noise can be reduced, it is possible to improve the working environment in which the bucket is used.

The invention according to claim 2 is, in addition to the features of claim 1, a bucket in which the damping plate is provided with flaky graphite cast iron or spheroidal graphite cast iron. In this invention, the bucket body is manufactured by using flake graphite cast iron or spheroidal graphite cast iron that is a damping metal, and the impact sound generated from the bucket body by the flake graphite cast iron or spheroidal graphite cast iron that is a damping metal, etc. The vibration of can be dampened.

According to the invention of claim 3, in addition to the matters of claim 1, at least one of rubber, synthetic resin, damping alloy or laminated plate as a damping material is provided between the strength steel members on the front and back sides of the damping plate. It is in a bucket that limits items that are sandwich structures that sandwich one. In this invention, the bucket body is configured by using the damping plates in which the damping material is sandwiched between the strength steel plates, and the damping materials are prevented from directly contacting rocks by the strength steel plates on both the front and back surfaces. Because of the peeling, even if the strong steel plates on both the front and back surfaces are collided with rocks or the like, the vibration damping material is not separated or worn, and vibrations such as impact noise generated by the collision can be attenuated. Therefore, the work environment can be improved by effectively utilizing the function of the damping material.

According to the invention of claim 4, in addition to the matters of claim 3, the damping material is a bucket in which the matters arranged only in a portion which is not affected by welding during manufacturing of the bucket body are limited. In the present invention, when manufacturing the bucket body using the damping plate sandwiching the damping material between the strength steel plates in a sandwich form, the damping material does not appear at the welding location, so that it is the same as normal welding work. The bucket body can be manufactured by performing a welding operation on the. In order to prevent the damping material from being exposed to the welded area, surround the damping material with a surrounding member and weld the surrounding member and the strength steel plates on both front and back sides together to form the bottom plate and side plate. You can

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. Figure 1
Shows a hydraulic excavator to which the bucket according to the present embodiment is applied, and a bucket for performing excavation work and the like is arranged on the upper swing body 1 of the hydraulic excavator so that the bucket can be raised and lowered.

The hydraulic excavator comprises a boom 2 which is pin-connected to an upper revolving superstructure 1 arranged on a traveling body, an arm 3 which is pin-connected to the tip of the boom 2, and a pin which is attached to the tip side of the arm 3. The bucket 4 and the like are connected to each other. A boom cylinder 5, an arm cylinder 6, and a bucket cylinder 7 are connected between the upper swing body 1 and the boom 2, between the boom 2 and the arm 3, and between the arm 3 and the bucket 4, respectively, via pin coupling portions. The rotation of each member is performed by the operation of each cylinder.

FIG. 2 shows a sectional view of the bottom plate or the side plate of the bucket, and FIG. 3 shows a sectional shape of the damping plate used for the bottom plate and the side plate. The bottom plate 8 or the side plate 9 has a structure in which 12 damping materials such as rubber, synthetic resin, damping alloy are sandwiched in a sandwich shape between the plate materials 10 on both front and back sides made of high strength steel. There is. Around the vibration damping material 12, a surrounding member 1 made of steel or the like that can block and reinforce the influence of welding.
1 is provided.

The surrounding member 11 and the plate members 10, 1 on both front and back surfaces
0 is integrally fixed by welding or the like. As shown in FIG. 4, the surrounding member 11 may be formed in a lattice shape, and a damping member may be filled between the lattices. At that time, as shown in FIG. 3, by making the height of the wall 16 forming the inner grid smaller than the wall thickness of the peripheral edge portion of the surrounding member, the damping material can be made the upper and lower surfaces and front and back surfaces of the inner grid It can also be inserted between the plate materials constituting the. Further, it may be formed in a rib shape instead of the grid shape as shown in FIG. Also in this case, by making the height of the rib 17 lower than the height of the peripheral edge portion, the vibration damping member can be inserted between the plate materials forming the upper and lower surfaces and the front and back surfaces of the rib 17.

The bucket 4 having the bottom plate 8 and the side plates 9, 9 has a side plate 9, 9 having a curved arc shape at a part of an outer peripheral edge of the bottom plate 8 formed in a curved arc shape in a side view. It is manufactured by welding after joining and. Also bucket 4
The base plate 13 and the claws 15 are welded to the peripheral edge of the opening of the base plate, and the joint between the bottom plate 8 and the side plates 9, 9 has a cross section of approximately L.
The strength of the bucket is increased by welding the character-shaped reinforcing plate 14. The bottom plate 8 may be formed of a single plate or may be formed by welding a plurality of plate materials. When a plurality of plate materials are welded to form the bottom plate, at least one plate material of the plurality of plate materials can be the damping plate of the present invention.

No surrounding member is provided at the joint between the bottom plate and the side plate, and even if the bottom plate and the side plate are welded to each other so that the damping material is not exposed to the outside by the reinforcing plate 14 at the joint portion. Good. As the vibration damping member, a laminated plate may be discretely connected to the back surface of the front plate or / and the front plate side of the back plate to be used at predetermined intervals. At this time, the laminated plate as the damping material needs to be sandwiched between the strength steel plates on the front and back sides in a sandwich form.

The damping plate of the present invention may be used as at least one plate material of the bottom plate and the side plate. If it is used as both the bottom plate and the side plate, the vibration noise of the bucket is
It can be reduced considerably.

As the vibration damping member, a member such as rubber, synthetic resin, flake graphite cast iron, spheroidal graphite cast iron, alloy or the like which can convert vibration energy into heat energy can be used. Further, the bucket can be manufactured as a bucket made of flake graphite cast iron or spheroidal graphite cast iron which is a damping alloy. At this time, the bucket is made of flake graphite cast iron, spheroidal graphite cast iron alone, or the same flake graphite cast iron, or an alloy of spheroidal graphite cast iron and another metal, and does not necessarily have a sandwich structure.

[Brief description of drawings]

FIG. 1 is a perspective view of a hydraulic excavator.

FIG. 2 is a schematic diagram of a bucket.

[Fig. 3] Sandwich structure.

FIG. 4 is a modification of the surrounding member.

FIG. 5 is another modification of the surrounding member.

[Explanation of symbols]

1 Upper revolving structure 2 boom Three arms 4 buckets 5 boom cylinder 6 arm cylinder 7 bucket cylinders 8 bottom plate 9 Side plate 10 Front and back plate materials 11 Surrounding member 12 damping material 13 Base plate 14 Reinforcement plate 15 nails 16 lattice wall 17 ribs 18 running bodies

Claims (4)

[Claims] 1. A bucket mounted on a tip of a work attachment of a construction machine or a work vehicle, wherein at least one of at least one bottom plate and / or both side plates constituting the bucket body is a damping plate. Bucket to do. 2. The bucket according to claim 1, wherein the damping plate comprises flake graphite cast iron or spheroidal graphite cast iron. 3. The vibration damping plate has a sandwich structure in which at least one of rubber, a synthetic resin, a damping alloy, or a laminated plate as a damping material is sandwiched between high-strength steel materials on both front and back surfaces. The bucket according to Item 1. 4. The bucket according to claim 3, wherein the damping material is provided only in a portion that is not affected by welding during manufacturing of the bucket body.