JP2881757B2 - Bottom dump type loader bucket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom dump type loader bucket which is provided in a construction machine such as a hydraulic shovel and is preferably used for excavating and transporting earth and sand.

[0002]

2. Description of the Related Art Generally, a large-sized hydraulic shovel for excavating and transporting earth and sand is usually provided with a bottom dump type loader bucket comprising a rear bucket and a front bucket which can be opened and closed with respect to the rear bucket. Is installed.

FIG. 3 to FIG. 9 show a bottom dump type loader bucket of a hydraulic shovel of this type according to the prior art.

[0004] In the drawings, reference numeral 1 denotes a support bracket integrally formed on an upper revolving structure (not shown) of a hydraulic shovel, and 2 denotes a front as a working device provided on the support bracket 1 so as to be able to move up and down. Reference numeral 3 denotes a part of the front 2, which is a boom pin-connected to the support bracket 1, and a connecting bracket 4 is fixed to a tip end of the boom 3. Reference numeral 5 denotes an arm pin-connected to the tip end of the boom 3 via the connection bracket 4.

[0005] Reference numeral 6 denotes a bottom dump type loader bucket which is pin-connected to the tip end of the arm 5 and accommodates earth and sand therein. As shown in FIG.
It comprises a rear bucket 7, a front bucket 8, and open / close cylinders 9, 9 (only one is shown) disposed in the rear bucket 7.

Reference numeral 10 denotes a boom cylinder connected between the support bracket 1 and the connection bracket 4, and 11 denotes a boom 3
Arm cylinder pin-connected between
Reference numeral 2 denotes a level cylinder pin-connected between the boom 3 and the arm 5, and reference numeral 13 denotes a bucket cylinder pin-connected to the connection bracket 4 and the arm mounting bracket 14 of the rear bucket 7.

Here, the conventional loader bucket 6 will be described with reference to FIGS.

The rear bucket 7 constitutes a rear plate of the loader bucket 6, and a mounting bracket 14 is fixed to the rear surface 7A side of the rear bucket 7 by means such as welding. A front bucket 8 is provided on the front face 7B side of the rear bucket 7 so as to be openable and closable. Here, as shown in FIG. 5, the front bucket 8 includes a pair of left and right side plates 8.
A, 8A and the bottom plate 8B form a substantially U-shape, and a plurality of claws 8C, 8C,... Are provided on the front edge side. The front bucket 8 is configured such that the end face of each side plate 8A abuts on and separates from the front surface 7B of the rear bucket 7, and each side plate 8A and the bottom plate 8B remove soil and the like during excavation between the front surface 7B of the rear bucket 7 and each other. It is designed to accommodate. A spill guard 7 made of a substantially trapezoidal plate is provided at the upper end of the rear bucket 7.
C is projected, and the spill guard 7C prevents scooped earth and the like from dropping to the rear surface 7A side of the rear bucket 7.

Reference numerals 15 and 15 denote a pair of cylinder housing portions provided on both the left and right sides of the rear bucket 7 and housing the opening and closing cylinders 9 and 9, respectively.
As shown by a dotted line in FIG. 4, a tube-side boss portion 9A of each opening / closing cylinder 9 is pin-connected to the lower end of the arm 5, and each rod-side boss portion 9B is connected to each arm portion 20 to be described later as shown in FIG.
Is pin-connected to the tip side of the.

Reference numerals 16, 16,... Denote a pair of left and right mounting brackets provided on the front surface 7B side of the rear bucket 7 and located above each cylinder accommodating portion 15. Each of the mounting brackets 16 is a front bucket. 8 are rotatably supported via hinge pins 21 described later.

Reference numerals 17 and 17 denote left and right mounting brackets 1 respectively.
6 and 16 show left and right openings formed on the front surface 7B side of the rear bucket 7, and each of the openings 17 is located on the upper front side of each cylinder accommodating portion 15, It is formed between each mounting bracket 16 and an upper cover 19 described later.

Reference numerals 18 denote punched holes (only one is shown) formed on the front surface 7B side of the rear bucket 7 so as to form a part of each of the openings 17, and each punched hole 18 has a substantially rectangular shape. The inside of each cylinder housing 15 is communicated with the outside. Here, the tip side of each arm 20 of the front bucket 8 is inserted into each punching hole 18, and the tip side of each arm 20 is inserted into the rod-side boss portion of each opening / closing cylinder 9 in each cylinder accommodating section 15. Pin 9B. Also, when each arm 20 is swung up and down by the opening / closing cylinder 9, the upper edge 1
8A, a gap is secured between the lower edge portion 18B and the arm portion 20.

Reference numerals 19, 19 denote left and right mounting brackets 1, respectively.
The left and right upper covers 19 are fixedly provided between the mounting brackets 16 and 16 by means of welding or the like. ,
The upper side of each opening 17 is constituted.

Reference numerals 20 and 20 denote a pair of left and right arms extending upward from each side plate 8A of the front bucket 8, and a pin is inserted into the tip end of each arm 20 as shown in FIG. A boss portion 20B having a hole 20A formed therein and a forked bracket portion 20C integrally formed on the tip side of the boss portion 20B are provided. Then, as shown in FIG. 8, the distal end side of each of the arms 20 is connected to the bracket 20C by the rear bucket 7.
The bracket portion 20C is pin-connected to the rod-side boss portion 9B of the opening / closing cylinder 9 while being inserted into each cylinder accommodating portion 15 through the opening portion 17 (punched hole 18). A pin is rotatably connected between the mounting brackets 16 via the hinge pins 21.

As a result, the front bucket 8 is connected to the rear bucket 7 via each arm 20 so as to be openable and closable, and when each opening and closing cylinder 9 is expanded and contracted, each arm 20 swings about each hinge pin 21. By moving (rotating), the front bucket 8 opens and closes with respect to the rear bucket 7.

Reference numerals 22 and 22 denote left and right mounting brackets 1 respectively.
6 shows left and right upper elastic covers provided on each upper cover 19 between the upper covers 6. Each of the upper elastic covers 22 is formed as a plate-like rubber made of an elastic resin material such as rubber. Is partially covered from above. Here, each upper elastic cover 22 has its base end fixed to the inner side surface at the lower end of each upper cover 19 via a bolt 23 and a pressing plate 24, and its distal end is a free end extending downward. ing. Then, each upper elastic cover 22
The front end side elastically slides on the upper surface side of the boss portion 20B of each arm portion 20, thereby closing a gap formed between each arm portion 20 and the opening portion 17, and from the upper edge portion 18A side of the punched hole 18. Dust and the like are prevented from entering each cylinder housing 15.

Reference numerals 25, 25 denote left and right lower elastic covers provided between the mounting brackets 16 and on the lower edge portion 18B side of the punched holes 18, respectively.
5 is also formed as a plate-like rubber like each upper elastic cover 22, and the base end side is fixed to the lower edge portion 18 </ b> B side of the punched hole 18 via a bolt 26. The distal end side of each lower elastic cover 25 is a free side that extends upward, and partially closes the gap between the lower edge portion 18B of the punched hole 18 and each arm portion 20. Dust and the like are prevented from entering the storage portion 15.

In the prior art constructed as described above, the bottom dump type loader bucket 6 is used to excavate earth and sand, etc.
In the case of discharging, first, each opening / closing cylinder 9 is extended to keep the front bucket 8 closed with respect to the rear bucket 7. While the boom 3 and the arm 5 are raised and lowered by the boom cylinder 10 and the arm cylinder 11, the loader bucket 6 is swung by the bucket cylinder 13 on the distal end side of the arm 5, and the soil and the like are scooped into the loader bucket 6. Thereafter, when the loader bucket 6 is moved to a place for discharging earth and sand, the front bucket 8 is rotated and opened in the direction of arrow A with respect to the rear bucket 7 by reducing the size of each opening / closing cylinder 9. Discharge the sediment, etc., stored in the outside.

In this way, when soil and the like are stored in the loader bucket 6 and the stored soil and the like are discharged to the outside, the scattered soil and the like are stored in the cylinder through the respective openings 17 of the rear bucket 7. Attempts to penetrate into the part 15. However, the gap formed above each arm 20 of the front bucket 8 in the opening 17 is closed by each upper elastic cover 22 as shown in FIG. 8, and the gap formed below the arm 20 is Since each cylinder housing 1 is closed by the lower elastic cover 25 during excavation work,
5 can be prevented from invading earth and sand.

[0020]

However, according to the above-mentioned prior art, the arm 20 is opened and closed when the front bucket 8 is opened and closed.
The upper elastic cover 22 slidingly contacting the upper surface side of the boss portion 20B is formed as a plate-like rubber made of an elastic resin material such as rubber. For example, as shown in FIG. However, when the upper elastic cover 22 collides with the upper elastic cover 22, there is a problem that the upper elastic cover 22 is damaged or damaged at an early stage, and durability and life are reduced.

When the upper elastic cover 22 is broken or damaged, a gap is formed between the arm 20 of the front bucket 8 and the opening 17, so that earth and sand enter the cylinder housing 15. However, there is a problem that a rod or the like of the opening / closing cylinder 9 is damaged early and a stable operation of each opening / closing cylinder 9 is impaired.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can surely prevent earth and sand from entering into each cylinder accommodating portion through each opening of the rear bucket, and can prevent the An object of the present invention is to provide a bottom dump type loader bucket that can improve reliability by compensating stable operation of a cylinder over a long period of time.

[0023]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pair of cylinder housings on both left and right sides, and an opening is formed on the upper front side of each cylinder housing. To the rear bucket via a pair of arms provided on the upper ends of the left and right side plates, and to the open / close state of the rear bucket. A front bucket inserted into an upper part of each cylinder housing part, and an upper end side disposed in each cylinder housing part of the rear bucket to open and close the front bucket with respect to the rear bucket. The present invention is applied to a bottom dump type loader bucket composed of a pair of opening / closing cylinders rotatably connected to the bottom.

A feature of the structure adopted by the first aspect of the present invention is that the rear bucket partially covers each of the openings with the front end of each of the arms of the front bucket,
An elastic cover for preventing dust from entering into each of the cylinder housings through each of the openings, and a guard plate made of a rigid material for protecting the elastic cover from the outside are provided.

Further, as in the invention described in claim 2,
Each opening of the rear bucket is located on the upper front side of each cylinder accommodating portion, and a pair of left and right mounting brackets provided on the rear bucket, and each of the mounting brackets on the upper side of each mounting bracket It is formed between the upper cover and the upper cover fixedly provided therebetween, and each of the mounting brackets is configured to rotatably connect the tip end side of each arm of the front bucket via a hinge pin. desirable.

Further, as in the third aspect of the present invention,
The elastic cover is formed of a plate-like rubber that is located between the mounting brackets, a base end side of which is fixed to the inner surface of the cover, and a distal end side of which is a free end and slidably contacts the upper surface of each arm of the front bucket. The guard plate may be formed of a metal plate having a base end fixed to an outer surface of the upper cover and a distal end extending toward a free end of the plate-like rubber so as to partially cover the plate-like rubber. it can.

[0027]

According to the above construction, according to the first aspect of the present invention, the rear bucket partially covers each opening between the front bucket and each arm tip end side. An elastic cover that prevents dust from entering the cylinder housing and a guard plate made of a rigid material to protect the elastic cover from the outside are provided, so the elastic cover accommodates earth and sand in the loader bucket. In addition, when discharging from the loader bucket to the outside, soil and the like can be reliably prevented from entering the cylinder storage portion through the opening, and the guard plate is stored and discharged in the loader bucket. It is possible to reliably prevent the elastic cover from being damaged or worn due to the collision or contact of rocks or the like contained in the elastic cover.

According to the second aspect of the present invention, each opening of the rear bucket is located on the upper front side of each cylinder accommodating portion and is provided with a pair of left and right mounting brackets provided on the rear bucket. It is formed on the upper side of each mounting bracket and between the upper cover fixedly provided between the mounting brackets, and each mounting bracket can pivot the front end side of each arm of the front bucket via a hinge pin. The elastic cover can prevent earth and sand from entering from the space between the upper cover and the upper surface of the arm of the front bucket through the opening. The elastic cover can be protected from rocks and the like contained in earth and sand that fall into the loader bucket due to work or the like, and damage to the elastic cover can be reliably prevented.

According to the third aspect of the present invention, the elastic cover is located between the mounting brackets, the base end is fixed to the inner surface of the cover, and the distal end is a free end, so that each arm of the front bucket is free. The guard plate is formed by a plate-like rubber that is in sliding contact with the upper surface, and the guard plate is fixed to the outer side surface of the upper cover, and the guard plate faces the free end of the plate-like rubber so that the distal end portion partially covers the plate-like rubber. The free end side of the rubber plate is always in sliding contact with the upper surface of each arm that rotates with the opening and closing operation of the front bucket, and rocks and the like enter through the opening. Can be prevented. Further, since the plate-like rubber which is easily damaged and worn is protected by the metal plate, it can be prevented from being damaged and damaged by intense direct impact of rocks such as excavation work.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A loader bucket according to an embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the prior art shown in FIGS. 3 to 9 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes a guard plate formed of a rigid material such as metal in a plate shape.
The base end is integrally fixed to the outer surface of the upper cover 19 by welding or the like, and the front end is configured as a metal plate extending toward the free end of the elastic cover 22. And
The guard plate 31 has the same width as the upper cover 19,
By partially covering the elastic cover 22 from above,
The elastic cover 22 is protected from the rock G or the like. The guard plate 31 prevents rocks G and the like contained in the soil and the like from colliding with and damaging the upper elastic cover 22 when the loader bucket 6 performs excavation work on the earth and sand.

The bottom dump type loader bucket according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, an upper elastic cover 22 that covers the opening 17 from above is provided on the inner side surface of the upper cover 19 that is located on the front surface 7B side of the rear bucket 7 and fixed between the mounting brackets 16. In addition to providing the upper elastic cover 22 of the upper cover 19 from the outside and protecting the upper elastic cover 22 from the rock G or the like, the following operation and effect can be obtained.

That is, the opening and closing cylinder 9 is driven to
When the front bucket 8 is opened and closed with respect to the rear bucket 7 by rotating the front bucket 8 around the hinge pin 21, the upper elastic cover 2
The sliding contact of 2 prevents earth and sand and the like from entering the cylinder housing portion 15 from between the upper cover 19 and the arm portion 20 through the opening 17 (the punched hole 18). When the rock G or the like scatters during the excavation work, the rock G or the like collides with the guard plate 31 as shown in the figure and does not collide with the upper elastic cover 22. Cover 22 with rock G
Thus, the dust intrusion prevention function of the upper elastic cover 22 can be maintained for a long time.

Thus, according to the present embodiment, the upper cover 1
By providing the guard plate 31 on the upper surface 9, the upper elastic cover 22 can be surely protected, and the upper elastic cover 22 can be reliably prevented from being worn and damaged early by the collision of the rock G or the like, and the elastic cover 22 can be prevented. Can greatly improve the durability and life of the device, and can improve workability during maintenance.

[0036]

As described in detail above, according to the first aspect of the present invention, a guard plate made of a rigid material is provided to protect the elastic cover from the outside. The elastic cover can be reliably protected,
The life and durability of the elastic cover can be improved. The elastic cover can prevent earth and sand from entering the cylinder housing portion, thereby extending the life of the opening / closing cylinder, and compensating the stable operation of the opening / closing cylinder for a long period of time. Performance can be greatly improved.

According to the second aspect of the present invention,
An opening formed by a pair of left and right mounting brackets and an upper cover fixed between the mounting brackets so as to cover the upper side of the mounting bracket is connected to the front end of each arm of the front bucket via a hinge pin. The guard plate effectively prevents rocks and the like generated during excavation work from colliding with the elastic cover, and soil and the like can be prevented from passing through the opening of the rear bucket. Intrusion into the cylinder housing can be prevented for a long time.

According to the third aspect of the present invention, the guard plate is fixed to the outer surface of the upper cover on the base end side, and is free of the plate-like rubber so that the distal end side partially covers the plate-like rubber. Since it is constituted by a metal plate extending toward the end, the tip end side of the plate-like rubber is elastically brought into sliding contact with the upper surface of the arm portion of the front bucket, so that intrusion of earth and sand can be more effectively prevented. The metal plate can prevent the rubber-like rubber from being worn or damaged early by the collision of the rock, and the life and durability of the rubber-like rubber can be greatly improved. As a result, it is possible to compensate for a stable operation over a long period of time without damaging the rods and the like of the opening / closing cylinder disposed in the cylinder accommodating portion, and to greatly improve the reliability of the loader bucket.

[Brief description of the drawings]

FIG. 1 is an enlarged longitudinal sectional view of a loader bucket according to the present invention.

FIG. 2 is an enlarged sectional view of a main part in FIG. 1 showing a guard plate and the like attached to an upper cover.

FIG. 3 is an external view showing a working device of a hydraulic shovel including a loader bucket according to a conventional technique.

FIG. 4 is an enlarged view of a loader bucket and the like shown in FIG. 3;

FIG. 5 is an external view of the front bucket shown in FIG.

FIG. 6 is a partially enlarged view showing an arm portion of the front bucket.

FIG. 7 is a front view showing a loader bucket.

FIG. 8 is an enlarged sectional view in the direction of arrows VIII-VIII in FIG. 7, showing an upper cover and the like of the loader bucket.

FIG. 9 is an enlarged view of a main part in FIG. 7, showing an elastic cover and the like provided on the upper front surface of the rear bucket.

[Explanation of symbols]

 Reference Signs List 6 loader bucket 7 rear bucket 8 front bucket 9 opening / closing cylinder 15 cylinder accommodating portion 16 mounting bracket 17 opening 19 upper cover 20 arm portion 21 hinge pin 22 upper elastic cover 23 bolt 24 push plate 31 guard plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 3/407

Claims (3)

(57) [Claims] 1. A rear bucket having a pair of cylinder housing portions provided on both left and right sides, an opening formed on an upper front side of each of the cylinder housing portions, and a rear bucket provided on an upper end side of the left and right side plates. A front bucket which is openably and closably attached to the rear bucket through a pair of arms, and a front end of each arm is inserted into an upper part of each cylinder accommodating portion through each opening of the rear bucket; A bottom comprising a pair of opening / closing cylinders disposed in each cylinder accommodating portion of the bucket and having an upper end rotatably connected to an end of each arm of the front bucket to open and close the front bucket with respect to the rear bucket. In the dump loader bucket, the rear bucket partially covers each of the openings between the front bucket and each of the arm tip ends, and each of the cylinder housing portions is provided through each of the openings. A bottom dump type loader bucket, comprising: an elastic cover for preventing dust from entering the inside; and a guard plate formed of a rigid material to protect the elastic cover from the outside. 2. A pair of left and right mounting brackets provided on the rear bucket, which are located on the upper front side of each of the cylinder housings, and each opening of the rear bucket, and an upper side of each of the mounting brackets. Formed between the mounting brackets and an upper cover fixedly provided between the mounting brackets, and each of the front end arms of the front bucket is rotatably connected to each of the mounting brackets via hinge pins. The bottom dump type loader bucket according to claim 1. 3. The elastic cover is located between the mounting brackets and has a base end fixed to an inner side surface of the upper cover, and a distal end side being a free end and slidingly contacting the upper surface side of each arm of the front bucket. The guard plate is formed of a plate-like rubber, and the guard plate is fixed to the outer surface of the upper cover at the base end side and extends toward the free end side of the plate-like rubber so that the distal end side partially covers the plate-like rubber. 3. The bottom dump type loader bucket according to claim 1, wherein the bottom dump type loader bucket is constituted by a metal plate.