JPS6212155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swing device for a grab bucket cart of a retractable crane type unloader.

When unloading bulk materials such as ore and coal loaded on a ship using a retractable crane type unloader, the cargo hold is wider than the hatch opening, so the bulk materials loaded below deck are Grabbing work is carried out by bringing the hoisting wire lobe close to the hatch coaming so that the grab bucket can go under the deck as much as possible. However, if the direction of opening and closing of the grab bucket is parallel to the hatch coaming, the limit that can be grasped is approximately 1 of the width of the grab bucket. By about 1/2 in, most of the area below the deck was raked up to the hatch opening with a bulldozer, etc., and grabbed with a grab bucket and brought ashore. In such cases, the working environment inside the hold is poor,
It is desired to shorten bulldozer work time.

The present invention improves the problems of the conventional retractable crane type unloader, and provides a retractable crane type unloader that makes it possible to shorten the work time of a bulldozer inside a ship hold by easily expanding the graspable range of a grab bucket in a ship hold. The purpose of the present invention is to provide a swing device for an unloader's grab bucket.

The grab bucket cart rotation device for a retractable crane type unloader of the present invention is a retractable crane type unloader in which: (a) the sheave shaft of the head sheave block of the bucket cart is provided at an angle of 45° with respect to the opening/closing direction of the bucket cart;

(b) One end is pivoted below the upper end of the lower link of the unloader, a support link is provided in front parallel to the tip link of the unloader, and a horizontal link is pivoted between the tip of the support link and the tip of the tip link. and held it horizontally.

(c) The horizontal link is formed as a rectangular crosspiece frame, and within the horizontal plane, the center portions of a pair of opposing links of a parallelogram link whose four corners are pivotally connected are perpendicular to the retracting direction of the horizontal link. Pivotally connected to the center of a pair of crosspiece frames.

(d) A plurality of wire sheave mounting frames are provided in parallel to the retracting direction of the horizontal link within the parallelogram link, and both ends of each mounting frame are pivotally connected to two opposing sides of the parallelogram link. thing.

(e) A wire sheave mounting shaft is mounted on each of the wire sheave mounting frames in a direction perpendicular to the retracting direction of the horizontal link, and a wire sheave is mounted on the mounting shaft.

(f) The swinging device for the parallelogram link is provided on the horizontal link.

(g) The bucket opening/closing drum and support drum of the unloader are drums with an equalizer device.

It is characterized by the features described in items (a) to (g) above, and by swinging the parallelogram link, the bucket support wire rope and By rotating the opening/closing wire rope, the grab bucket can be rotated 90 degrees. The details will be explained below with reference to embodiment figures.

FIG. 1 is an overall view (side view) of a retractable crane type unloader equipped with the device of the present invention, showing a state in which the unloader is working on a ship. FIG. 2 is a diagram showing a wire rope system for supporting and opening/closing the bucket.

In FIG. 1, S indicates the ship, 1 is the lower link of the retracting motion part of the unloader, 2 is the upper link, and 3 is the tip link, which are the same as the conventional structure. Reference numeral 9 denotes a support link, one end of which is pivotally connected below the upper end of the lower link 1, extends forward approximately parallel to the tip link 3, and connects the other end of the support link 9 with the tip of the tip link 3. The horizontal links 8 are pivotally connected horizontally. With this structure, the horizontal link 8 is always held horizontally regardless of the vertical movement of the retracting portion of the unloader.

FIG. 2 shows the wire rope system of the grab bucket (see FIG. 1), and 31 is an opening/closing drum on which two opening/closing wire ropes 33 are wound. Further, 32 is a support drum around which two support wire ropes 34 are wound, and a total of four wire ropes are used for supporting and opening/closing the bucket. Therefore, four sheaves are required for each wire at the tip of the tip link.

FIG. 3 is a plan view of the grab bucket belt. In the present invention, the sheave axis of the head sheave block 5 of the grab bucket trunk 4 is inclined at 45 degrees with respect to the bucket opening/closing direction as shown in the figure. Therefore, the support rope end 6, the opening/closing rope sheave 7, the opening/closing rope, etc. are arranged at an angle of 45° with respect to the bucket opening/closing direction.

Figures 4 to 6 are enlarged detailed views of the horizontal link portion, with Figure 4 being a plan view thereof, and Figure 5 being a C.
-C arrow view, and Figure 6 is a D-D arrow view (However, in Figures 5 and 6, the sheaves 12, 12', 1 of Figure 4 are
3 and 13' are moved in a straight line).

As shown in each figure, the horizontal link 8 has a pin 1 horizontally attached to the tip of the tip link 3 and the tip of the support link 9.
0 and 11, so that the unloader can always remain horizontal during the retraction movement. The horizontal link 8 is a square crosspiece frame, and on its horizontal plane, the four corners are connected to pins 24a, 24b, 24c, and 24d.
Attached are parallelogram links 20-21-22-23 which are pivotally connected to form a parallelogram. That is, the pins 2 are attached to the center portions of a pair of opposing parallel links 20 and 21 of the parallelogram links to the center portions of a pair of crosspiece frames perpendicular to the retracting direction of the horizontal links 8.
5a and 25b. Another pair of parallelogram links 22 and 23 have their outwardly projecting portions slidably supported on the crosspiece frame.

The parallelogram link 20-21-22-23 usually has four wire sheave mounting frames 14, 1.
4', 15, 15', each end of which is connected to a pin 18, 1
Parallel links 20 and 21 by 8', 19, 19'
The horizontal links 8 are pivotally connected in parallel to each other, and are attached parallel to the retracting direction of the horizontal links 8.

The above wire sheave mounting frame 14, 14', 1
5, 15' each has a wire sheave mounting shaft 1.
6, 16', 17, 17' are attached in a direction perpendicular to the horizontal link drawing direction, and wire sheaves 12, 12' for supporting ropes and wire sheaves 13, 13' for opening and closing ropes are attached thereto.

According to the above structure, the parallelogram link 2
When 0-21-22-23 is swung around the pins 25a and 25b on the horizontal link frame, each wire sheave remains parallel and the pin 25
The two sheaves on each side of the axis connecting a and 25b move in opposite directions, and the positions of the four wire ropes passing through the sheaves rotate. Therefore, the grab bucket suspended by the wire rope is rotated by the swinging of the parallelogram link.

A segment gear 26 is attached under the shaft of the pin 25b (or 25a) and meshes with the pinion 27, and is driven by a motor 28 with a brake and speed reducer provided on the horizontal link. By driving the motor 28, the parallelogram link can swing a total of 90 degrees to the left and right up to a position of 45 degrees. The grab bucket can therefore be rotated through 90°. Limit switch 2 is used to detect the position of rotation and stop it.
9a and 29b.

In the retractable crane type unloader equipped with the grab bucket swing device of the present invention, if the parallel links 20 and 21 are tilted 45 degrees toward the front side of the crane as shown in FIG. 4, as shown in FIG. The opening and closing direction of the grab bucket is parallel to the normal line of the rock wall, and when it is lowered into the hold, it will be in a suspended state as shown by X in the ship S in Figure 1.

In the unloading operation, the grab bucket is first lowered into the hold as described above, and then the segment gear 26 is moved by the motor 28 on the horizontal link.
, until the parallel links 20 and 21 are tilted 45 degrees to the opposite side as shown by the two-dot chain line in FIG.
If you turn it 90 degrees, the grab bucket will also turn 90 degrees, and its opening/closing direction will be perpendicular to the normal line of the rock wall. If you open the grab bucket in this state, the first
As indicated by Y in the main ship S in the figure, the tip of the grab bag can reach areas that are difficult to grab due to the hatch coaming in the hold, expanding the gripping range of the grab bucket. Therefore, it becomes possible to shorten the time it takes to scrape the inside of the ship's hold with a bulltozer.

In addition, in the above-mentioned unloading operation, due to the rotation of the parallelogram links 20-21-22-23, the sheave 30 at the rear of the tip link of the unloader and the wire sheaves 13, 13', 1 in the parallelogram links
4 and 14', there are distance differences between the four wire ropes, but the opening and closing drum 3 of the unloader
1 and the support drum 32, the distance difference can be automatically absorbed.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a retractable crane type unloader equipped with the device of the present invention, Fig. 2 is an explanatory view showing the wire rope system of the grab bucket cart, Fig. 3 is a plan view of the grab bucket cart according to the present invention, and Fig. 4
5 and 6 are enlarged detailed views of the horizontal link portion in the present invention, where FIG. 4 is a plan view, FIG. 5 is a view taken along the line C-C, and FIG. 6 is a view taken along the line D-D. It is. 1: Lower link, 2: Upper link, 3: Tip link, 4: Grab bucket belt, 5: Head sheave block, 6: Support rope end, 7: Opening/closing rope sheave, 8: Horizontal link, 9: Support link, 1
0, 11: Pin, 12, 12': Wire sheave for support rope, 13, 13': Wire sheave for opening/closing rope, 14, 14', 15, 15': Wire sheave mounting frame, 16, 16', 17, 17': Wire sheave mounting shaft, 18, 18', 19, 1
9': Pin, 20, 21, 22, 23: Parallel link, 24a-d: Pin, 25a-b: Pin, 2
6: Segment gear, 27: Pinion, 28:
Motor, 29a-b: Limit switch, 3
0: Tip link rear sheave, 31: Opening/closing drum,
32: Support drum, 33: Opening/closing wire rope, 34: Support wire rope.

Claims (1)

[Scope of Claims] 1. In the retractable crane type unloader, (a) the sheave shaft of the head sheave block of the bucket belt is provided at an angle of 45° with respect to the opening/closing direction of the bucket belt. (b) One end is pivoted below the upper end of the lower link of the unloader, a support link is provided in front parallel to the tip link of the unloader, and a horizontal link is pivoted between the tip of the support link and the tip of the tip link. and held it horizontally. (c) The horizontal link is formed as a rectangular frame, and within the horizontal plane, the center portions of a pair of opposing links of a parallelogram link whose four corners are pivotally connected are perpendicular to the retracting direction of the horizontal link. Pivotally connected to the center of a pair of crosspiece frames. (d) A plurality of wire sheave mounting frames are provided in parallel to the retracting direction of the horizontal link within the parallelogram link, and both ends of each mounting frame are pivotally connected to two opposing sides of the parallelogram link. thing. (e) A wire sheave mounting shaft is mounted on each of the wire sheave mounting frames in a direction perpendicular to the retracting direction of the horizontal link, and a wire sheave is mounted on the mounting shaft. (f) The swinging device for the parallelogram link is provided on the horizontal link. (g) The bucket opening/closing drum and support drum of the unloader are drums with an equalizer device. A grab bucket swing device for a retractable crane type unloader characterized by the features described in items (a) to (g) above.