JPS6141797Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grab bucket for a dredger or the like, and particularly relates to a guide roller for an opening/closing rope of a grab bucket.

Generally, a dredger uses a grab bucket to dredge earth and sand at the bottom of a water body, and the grab bucket hangs from a jib and expands to scoop up the earth and sand and unload it onto a sand carrier. Such a grab bucket includes a lifting rope suspended from a dredger on the water and an opening/closing rope for expanding the grab. The lifting rope suspends the upper frame of the grab bucket and supports the entire grab bucket so that it can be raised or lowered, but the opening/closing rope is wound around multiple sheaves that are rotatably supported on the upper and lower frames respectively. It has a structure that can be rotated and moved. On the other hand, a grab bucket cart is composed of an upper frame, a lower frame, a shell, and a rod that connects these together, and each part is movable via the shaft. The center lines of the lower frame and the center line of the lower frame do not necessarily coincide, and the operation is not always symmetrical. In such a case, the opening/closing rope moves against the wall separating the sheaves, which causes the rope to wear out and shorten its lifespan, which is a major problem. For this reason, the opening/closing rope had to be replaced in a short period of time, which was extremely uneconomical.

Therefore, in view of the above circumstances, the present invention prevents the opening/closing rope from touching the bulkhead that divides the sheaves of the upper frame during operation, thereby preventing the opening/closing rope from wearing out and making it economical and usable for a long period of time. The present invention provides a grab bucket cart equipped with a guide roller for an opening/closing rope.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In the figure, 1 is an upper frame, 2 is a lower frame, 3 is a rod, and 4 is a shell, each of which is movable via a pivot point 5. The upper frame 1 is engaged with a lifting rope 6 that suspends the entire grab bucket, and is attached to a jib (not shown) of a dredger.
suspended in the On the other hand, the opening/closing rope 7 hangs down from the jib of the dredger, passes approximately at the center of the upper frame 1, and is wound around a sheave housed inside the lower frame 2. Two opening/closing ropes 7 are used as a pair, each of which is wound around a sheave 8 provided on the lower frame 2 and the upper frame 1, and each pair is fixed to the upper frame 1 or the lower frame 2. As shown in FIG. 2, sheaves 8 are rotatably supported on the upper frame 1 symmetrically about partition walls 9, 9 in the center thereof. on the other hand,
The lower frame 2 also rotatably accommodates the same number of sheaves as the sheave 8 or two more sheaves. Each other end of the opening/closing rope 7 extends from the jib to the dredger so that it can be loosened or pulled independently, respectively.
It is operable. Therefore, when the opening/closing rope 7 is loosened, the shell 4 falls due to its own weight and the weight of the lower frame 2, and the shaft support 50 descends, rotating around the shaft support 5 with the rod 3, and the shell 4 expands. (See the phantom line diagram in Figure 1). Also, on the contrary,
When the opening/closing rope 7 is pulled, the pivot support 50 rises and the shell 4 closes (see the solid line diagram in FIG. 1).
In this way, since the opening/closing rope 7 moves up and down from the upper frame 1, guide rollers 10 and 11 for guiding the opening/closing rope 7 are attached to the upper and lower surfaces of the upper frame 1, respectively.

The guide roller 10 is attached to the upper surface of the upper frame 1 and guides the opening/closing rope 7, and has a structure as shown in FIGS. 4A and 4B. That is,
A pair of rollers 12 are placed between a pair of brackets 14 so as to be rotatable at a constant interval, and below the rollers 12 two sheaves 13 are attached to their shafts 13a.
The roller shaft 12a is supported by a bracket 14 so as to be orthogonal to each other. The bracket 14 is detachably attached to the top plate 15 of the upper frame 1 via a shaft 14a. Therefore, roller 12 and sheave 1
3 are perpendicular to each other, so the opening/closing rope 7 is held between the sheaves 13 and the rollers 12 limit the swinging of the opening/closing rope 7. Note that a through gap for the opening/closing rope 7 is formed in the upper surface plate 15.

On the other hand, the guide roller 11 has a pair of rollers 18 between a pair of brackets 17 fixed to the bottom plate 16 of the upper frame 1, as shown in FIGS. 5A and 5B.
is rotatably supported. A pair of rollers 18
As with the rollers 12, a constant interval, that is, a gap larger than the diameter of the opening/closing rope 7 is provided. Note that the guide roller 11 is long enough to allow swinging of the opening/closing rope 7, and does not have a sheave. roller 12,
18, as shown in FIG. 6, has a drum 22 in which a bearing 20 and an oil seal 21 are interposed on the roller shaft 19, and a stopper 23 for the roller shaft 19, and extends from one end of the roller shaft 19 in the axial direction. A lubrication hole 24 is bored and open between the drum 22 and the roller shaft 19. Grease oil or the like is injected into the lubrication hole 24 to lubricate the rotation of the drum 22.

Therefore, by providing the guide rollers 10 and 11 of the opening/closing rope 7 on the upper and lower surfaces of the upper frame, each opening/closing rope 7 can be attached to the roller 1.
Since the sheave 13 and the sheave 13 can be moved up and down while rolling, the opening/closing rope 7 can be guided and driven without colliding with the partition wall 9.

According to the present invention described above, guide rollers are provided on the upper and lower surfaces of the upper frame to prevent the opening/closing rope from colliding with the bulkhead of the sheave storage section of the upper frame, so that the center lines between the upper frame and the lower frame are misaligned. Even in such an operating position, the opening/closing rope is prevented from colliding with the bulkhead and being worn out, thereby increasing its lifespan, which is economical. Furthermore, the structure of the present invention is simple and simple, easy to manufacture, and inexpensive, and can also be used with existing grab buckets. Since the opening/closing rope moves smoothly between the upper frame and the lower frame while being guided, no excessive force is applied to the upper frame or the lower frame, and there is no risk of damaging them.

[Brief explanation of drawings]

The drawings show an embodiment of the dredging grab bucket according to the present invention, and FIG. 1 is a front view thereof, FIG. 2 is an enlarged front view of the upper frame, FIG. 3 is an enlarged side view of the upper frame, and FIG. A is a front view of the upper guide roller, FIG. 4B is a side view thereof, FIG. 5A is a front view of the lower guide roller, and FIG. 5B is a side view thereof.
FIG. 6 is a longitudinal sectional view of the main part of the roller. 1... Upper frame, 2... Lower frame, 4
... Ciel, 6 ... Lifting rope, 7 ... Opening/closing rope, 8 ... Sheave, 9 ... Bulkhead, 10, 11 ...
Guide rollers, 12, 18...Rollers, 16...
Bottom plate, 17...Bracket, 19...Shaft, 20
...Bearing, 21...Oil seal, 22...
...Drum, 23...Stopper, 24...Lubrication hole.

Claims (1)

[Scope of utility model registration request] An appropriate number of sheaves are rotatably supported on the upper frame and the lower frame, and an opening/closing rope is wound around the sheaves so that the grab can be freely expanded,
In a dredging grab bucket in which an upper frame is suspended by a lifting rope, a guide roller consisting of a pair of rollers and a pair of sheaves positioned orthogonally below the pair of rollers is protruded on the upper surface of the upper frame. In addition, by protruding a guide roller consisting of a pair of rollers on the lower surface of the upper frame, the opening/closing rope is rotatably sandwiched and guided by the guide rollers on the upper and lower surfaces of the upper frame. A grab bucket for dredging, characterized in that the opening/closing rope does not collide with the bulkhead of the sheave storage section of the upper frame.