JPH04120Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a grab bucket for grabbing and handling bulk materials at construction sites and the like.

[Conventional technology]

A conventional grab bucket of this type is shown in FIG. (Jikko 51-
No. 48168) This grab bucket has a torque shaft 17A,
It was equipped with a 17B. And this torque shaft 17
A center frame 18 with a built-in hydraulic cylinder 19 was placed on top of A and 17B via a split bearing 18a. In this case, the hydraulic cylinder 19 in the frame 18 has its base end swingably connected to a pin 19a at one corner, and the tip of the rod is connected to the torque shaft 17B on the other side of the bucket shell 16B.
A pin 24 is loosely inserted into the tip of a lever 21 that is fixedly connected to the lever 21 . On the other hand, a lever 20 connected to a rod 23 via a pin 22 was fixed to the torque shaft 17A on the side of the bucket shell 16A. Furthermore, the tip of this rod 23 was connected to the middle part of the other side lever 21 by loose insertion of a pin 25. According to the above aspect, the center frame 18
When grasping loose objects while suspending both bucket shells 16A and 16B via the hanging fitting 26 at the upper center, the hydraulic cylinder 19 is expanded and contracted to swing the levers 20 and 21 in a cooperative manner.
The bucket shells 16A, 16B are opened and closed by this.

[The problem that the idea aims to solve]

Due to the above, the conventional grab bucket has the following problems.

Since the center frame 18 containing the hydraulic cylinder 19 is placed on the torque shafts 17A and 17B located at the top of the bucket shells 16A and 16B, the overall center of gravity is located at a high position.
It was easy to fall over and it was difficult to hold it stably.

In addition, since the torque shafts 17A and 17B are attached to each of the bucket shells 16A and 16B, when the hydraulic cylinder 19 is operated, the torque shafts 17A and 17B are
The need to rotate the parts by the same amount made the structure complex, making maintenance difficult and increasing costs.

Furthermore, since two torque shafts are attached to the pair of bucket toshiels 16A and 16B, the points of force of the gripping locus are separated, which reduces gripping efficiency when working on slopes, and also
Since the buckets are hung only at certain points, when the grips are not balanced during opening, the bucket toshields 16A and 16B shake, which impairs work efficiency.

This invention solves the problems of the prior art described above. In other words, the purpose of this invention is to lower the center of gravity to enable stable gripping operations, and the two bucket tosiels have a simple structure due to the loose insertion of one main shaft, resulting in easy maintenance and low cost. To provide a grab bucket which has an arcuate shape to improve gripping efficiency even on an inclined surface, and improves workability by preventing swinging due to suspension on all sides.

[Means to solve the problem]

In order to achieve the above purpose, this invention consists of two
In the grab bucket, which opens and closes individual buckets to grasp and handle bulk materials, bucket arms are installed protruding from both buckets, which are equipped with a drive source chamber and a hydraulic tank chamber in a distributed manner, and at the intersection of these two buckets. One main shaft is loosely inserted, and a trunnion-type hydraulic cylinder is placed at the upper position perpendicular to the main shaft, so that the cylinder part is connected to one bucket arm, and the rod part is connected to the other bucket arm so that they can move together. Moreover, both bucket arms were suspended from the four-way chain of the suspension bracket.

[Effect]

When grabbing and handling loose objects using the grab bucket with the above configuration, both bucket tosses are opened at once. Therefore, when the hydraulic cylinder, which had been extended until then, is compressed, the bucket shell opens around this main shaft. Therefore, by moving the hanging bracket to bring the open bucket shell close to the object to be grabbed, and then closing both bucket shells by extending the hydraulic cylinder again, the desired object to be grabbed can be easily and securely grabbed. . As a result of the above, this grab bucket can open and close the bucket shell by simply operating the hydraulic cylinder and directly expanding and contracting the cylinder without requiring the participation of other members. In addition, the drive source chamber for heavy objects and the hydraulic tank chamber are installed in the lower parts of both bucket shells in a distributed manner, so the center of gravity is lowered and both bucket shells can be gripped and operated in a stable state without falling over during work. It can be carried out. Moreover, when the two bucket shells are used to grasp loose objects, the heavy objects generated by the drive source chamber and the hydraulic tank chamber provided in the bucket shells are added to further strengthen the gripping force due to the joining of the tips of the two shells. Further, in both bucket tossiels, the gripping locus becomes an arc due to the loose insertion of one main shaft into the bucket arms protruding from both sides, so that the gripping operation can be performed efficiently even on an inclined surface. In addition, both bucket shells are hung evenly at multiple points by four-way chains on the hanging bracket side with respect to both bucket arms, so it is possible to reliably prevent the shells from swinging during the gripping operation when opening. can.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in Figs. 1 to 4, this grab bucket is equipped with a drive source chamber 11 and a hydraulic tank chamber 14 at a lower position, and a pair of bucket arms 3A and 3B protruding from the upper part. Bucket shells 1A and 1B, a main shaft 4 loosely inserted at the intersection of both bucket shells, a hydraulic cylinder 5 that opens and closes both bucket shells 1A and 1B, and a suspension with a chain 9 that evenly suspends both bucket shells 1A and 1B. The main part of the bracket 10 is constructed as follows.

First, the pair of bucket shells 1A and 1B are designed so that when they are joined together, the object to be grasped can be grabbed by the tip of the inner lower end of the shell, and the object can be grasped or taken into the inside of both. The vertical joint surface is shaped like a bucket. One of the bucket shells 1A is located on the outside facing the inside of the shell tip (right position in Figures 1 to 3).
A cylindrical drive source chamber 11 whose front and rear sides are closed is installed inside the shell. This drive source chamber 1
As shown in FIG.
and a hydraulic pump 13 are housed in a directly connected manner.

In addition, the other bucket shell 1B has a cylindrical hydraulic tank chamber 14, which is closed at the front and back, in the shell at the outside position facing the inside of the shell tip (the left position in Figures 1 to 3). Equipped. Although not shown, the hydraulic tank chamber 14 and the drive source chamber 11 are connected by a high-pressure rubber hose (not shown) that delivers pressurized oil.

Next, at the center position inside each of the bucket shells 1A and 1B as described above, a pair of bucket arms 3A and 3B are attached at the top of each other using support rods 2A and 2B attached to the tops of both as support rods. The portions are provided in a protruding manner to face each other in such a manner that they form intersecting overlapping surfaces in front and rear views. In this case, one bucket arm 3A
is arranged wide, and the other bucket arm 3B is arranged narrowly. Therefore bucket Toshiel 1
When A and 1B are assembled and opened/closed, they are configured so that they do not come into contact with each other on a plane.

In the above-mentioned aspect, the intersecting parts of the bucket arms 3A and 3B (the parts that become overlapping surfaces in front and rear view) include:
One main shaft 4 is loosely inserted. Due to this loose insertion of the main shaft 4, both the bucket tosiel 1A, 1B are connected to the main shaft 4.
It is constructed so that opening and closing operations can be performed in an arc shape centered on .

Upper position perpendicular to main shaft 4 (bucket tosiel 1
Bucket arms 3A and 3B in the direction in which A and 1B open and close
A trunnion-type hydraulic cylinder 5 is horizontally arranged at a position between the upper parts of the cylinder. The cylinder trunnion 6 provided in the cylinder portion 5a of this hydraulic cylinder 5 is connected to the other bucket arm 3B.
It is loosely inserted into the upper end surface of the Also, the rod part 5b
The rod bracket 7 is approximately V-shaped in plan view.
is attached, and both ends of this bracket 7 are
On the other hand, in contact with the upper end surface of the bucket arm 3A, the rod side pin 8 is loosely inserted into both surfaces so as to be integrally movable.

Further, a bucket tosiel 1A according to the above embodiment,
A hanging bracket 10 with chains 9 of a predetermined length provided on all sides is fixed in the upper part of 1B.
The lower end of each chain 9 is connected to the bucket arms 3A and 3B.
The bucket shells 1A, 1B are evenly suspended by this chain 9, connected to the mid-height edge on each side. A cylinder rod cover 15 is installed on the upper part of the hydraulic cylinder 5 to prevent rainwater from splashing on the main shaft 4, the central band excluding both ends of the hydraulic cylinder 5, the cylinder trunnion 6, the rod side pin 8, etc. It is applied in sections and is assembled into a grab bucket as a whole.

When grabbing and handling loose objects using the grab bucket with the above configuration, both bucket tosses 1A and 1B are opened at once. As shown, the hydraulic cylinder 5 is in the closed state due to extension, so when the hydraulic cylinder 5 is compressed to open it, the rod portion 5b, which was in the extended state just before that, retreats.
The rod side pin 8 attached to the rod bracket 7 also moves in the backward direction (leftward in the figure) around the main shaft 4 with one bucket arm 3A following.
It will move in an arc.

At this time, the trunnion 6 of the cylinder part 5a tries to maintain its stopped state in its original position, but due to the retreat of the rod part 5b, the entire hydraulic cylinder 5 descends from its previous upper position, and the hanging position of the chain 9 also changes. Due to the narrowing, the cylinder trunnion 6 and the rod side pin 8 move in the direction of changing their positions in a crosswise manner at the upper position of the main shaft 4, and both bucket shells 1A and 1B are moved around the main shaft 4 as shown in FIG. It will be in an open state. Therefore, if the hanging bracket 10 is moved to the upper part of the work area at this point, both the open bucket shells 1A and 1B can approach the object to be grabbed (not shown), and after this approach, the hydraulic cylinder 5 is extended again. By doing so, both bucket shells 1A and 1B close around the main shaft 4, and a desired object can be easily and securely grabbed by the tips of the shells.

As a result of the above, this grab bucket can be operated simply by operating the hydraulic cylinder 5 without requiring the participation of other members (for example, the levers 20, 21 and rod 23 in the grab bucket of Utility Model Publication No. 51-48168 shown in Fig. 5). By directly expanding and contracting the cylinder 5, both bucket shells 1A and 1B can be opened and closed easily and reliably.

In addition, since the drive source chamber 11 for heavy objects and the hydraulic tank chamber 14 are installed in a distributed manner in the lower parts of the buckets 1A and 1B, the center of gravity is lowered and the buckets 1A and 1B are prone to tipping over during work. Grasping operations can be performed in a stable state without any problems. Moreover, both buckets Toshiel 1A, 1B
When the shell tips of the buckets are used to grasp loose objects, the heavy objects generated by the drive source chamber 11 and the hydraulic tank chamber 14 installed in the bucket shells 1A and 1B are added to further strengthen the gripping force due to the joining of both shell tips. can do.

Furthermore, both bucket shells 1A and 1B have one main shaft 4 loosely inserted into the intersecting surface of bucket arms 3A and 3B protruding from both sides, and the gripping locus of both shell tips forms an arc, making it efficient even on inclined surfaces. You can perform grasp operations. Both bucket arms 3A and 3B are connected to both bucket arms 3A and 3B.
Since the shells are hung evenly at a plurality of locations by the four-way chain 9 on the side of the hanging bracket 10, it is possible to reliably prevent each shell tip from swinging during the gripping operation when opening.

[Effect of idea]

This idea involves protruding bucket arms from both bucket shells that are equipped with a drive source chamber and a hydraulic tank chamber in a distributed manner, and inserting a main shaft loosely into the intersection of both bucket arms. Trunnion-type hydraulic cylinders are arranged at orthogonal upper positions, the cylinder part is movably connected to one bucket arm, and the rod part is movable to the other bucket arm, and both bucket arms are suspended from the four-way chain of the bracket. It is characterized by being suspended by. Therefore, the overall center of gravity is lower, allowing for stable gripping operations, and the fulcrum for opening and closing operations can be established by simply inserting one main shaft into both bucket tosiels, resulting in easy maintenance and low cost due to the simple structure. In addition to this, the gripping trajectory is also arcuate, making it possible to improve gripping efficiency on sloped surfaces, and hanging with a four-way chain prevents swinging.
This has the effect of improving the workability of cargo handling using a bucket.

[Brief explanation of the drawing]

Figure 1 is a front view of the glove bucket according to this invention in the closed state, Figure 2 is a front view of the glove bucket in the open state, Figure 3 is a plan view of the grab bucket, and Figure 4 is a plan view of the grab bucket bag.
The figures are the same side view, FIG. 5a is a perspective view of a conventional grab bucket bag, and FIG. 5b is a detailed view showing the drive member around the center frame of FIG. 5a. 1A, 1B... Bucket Toshiel, 3A, 3B...
...Bucket arm, 4...Main shaft, 5...Hydraulic cylinder, 5a...Cylinder part, 5b...Rod part, 9
...Chain, 10...Hanging bracket, 11...
...Drive source room, 14...Hydraulic tank room.

Claims (1)

[Scope of utility model registration request] In a grab bucket that opens and closes two bucket shells to grab and handle bulk materials, bucket arms are provided protruding from both bucket shells, which are equipped with a drive source chamber and a hydraulic tank chamber in a distributed manner, and a crossing point between the two bucket arms is provided. A main shaft is loosely inserted into the main shaft, and a trunnion-type hydraulic cylinder is placed at the upper position perpendicular to the main shaft, so that the cylinder part can be moved integrally to one bucket arm, and the rod part can be integrally moved to the other bucket arm. A grab bucket bag that is connected and has both bucket arms suspended by a four-way chain of a hanging bracket.