JPH0752150Y2 - Jib tip sheave device of multi-purpose crane - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a jib tip sheave device for a multi-purpose crane that performs hook work, grab work, container lifting work, and other various crane work using four wire ropes. It is a thing.

[Prior Art] With a double-link type crane that performs various crane operations using four wire ropes, grab and hook operations are performed by two-point suspension, but the container suspension is a long container. In addition, since the stored luggage may be eccentric, it is suspended at four points.

In the case of converting work between two-point suspension and four-point suspension, conventionally, the wire rope is manually removed from the sheave for four-point suspension or incorporated into the sheave, or as shown in FIG. 7 and FIG. As shown, the inner wire ropes c and d of the four wire ropes b, c, d, and e that suspend the hook a are attached to the hydraulic cylinder i at the end of a jib h including a top jib f and an auxiliary link g.
The spreader m for the container is suspended at four points so that the spreader m for the container is circumvented by the rotary sheaves k and l at the tip of the arm j that is rotatably attached.

[Problems to be solved by the invention] However, the wire rope detoured by the rotating sheaves k and l
Since loads similar to those of the other wire ropes b and e are also applied to c and d, the hydraulic cylinder i is compressible, and there is concern about securing the position due to oil leaks, etc. It had to be pinned to h.

In the case of fixing the position of the rotary sheaves k and l, the worker should move the fixing hole of the rotated rotary sheaves k and l and the fixing hole on the jib h side up to a height of 25 to 35 m. After confirming the above, a large weight pin is inserted with a hydraulic cylinder, etc., so complete remote operation is not possible and there is a risk of work at high places, especially because the top jib f and the auxiliary link g have weak rigidity. It took 5 to 10 minutes to align and insert the pins, which took time and effort.

[Means for Solving Problems] An object of the present invention is to solve the above problems and to enable switching between two-point suspension and four-point suspension by remote control safely in a short time. With a parallelogram link between the main jib and the tip of the horizontal guide rod that are parallel to each other, the horizontal beam is pivotally supported so that the horizontal state can be maintained at all times.
Four sheaves are attached to the tip of the main jib on the same axis, and a moving sheave block having two sheaves at substantially the same intervals as the two inner sheaves can be horizontally moved along the horizontal beam. Thus, the present invention relates to a jib tip sheave device of a multi-purpose crane, characterized in that a drive device capable of horizontally moving the moving block is provided between the horizontal beam and the moving sheave block.

[Operation] For example, when the moving sheave block is moved from the standby position to the container suspension position along the horizontal beam by a driving device such as a screw rod, the wire rope hung on the sheave inside the tip of the main jib moves. It is detoured by the sheave to form four suspension points.

By returning the moving sheave block to its original standby position,
There are two hanging points.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the present invention, in which a horizontal beam 3 having a U-shaped cross section is mounted on both sides of a parallel top jib 2 of a double-link type crane 1 via a bracket 4 and a top jib tip pin. 5, the horizontal beam 3 is pivotally supported at a substantially central portion in the longitudinal direction, and sheaves 6, 7 are rotatably attached to both outer sides of the bracket 4 by the top jib tip pins 5 via bearings. The sheave 7 serves as an opening and closing rope sheave during grab work, and the sheave 6 similarly serves as a supporting rope sheave.

A bracket 8 is provided at the tip of the horizontal beam 3 so as to face upward, and a tip of a horizontal guide rod 9 arranged substantially parallel to the top jib 2 is pivotally attached to the tip of the bracket 8 by a pin 10. Also, by arranging a pin (not shown) that pivotally supports the rear end of the horizontal guide rod and the pins 5 and 10 at the tip at the apex position of the parallelogram to form a parallelogram link, the jib 11 can be leveled during the undulating motion. The horizontality of the beam 3 is maintained, and the horizontal beam 3 is fixed in parallel by the beams 12, 13 and 14 at both ends and the upper center.

The traveling bodies 18 are attached so that the lower rail portions 15 of the respective horizontal beams 3 are sandwiched between the rollers 16 and 17 from above and below, and the traveling bodies 18 are connected by beams 19, and a shaft is provided below the beams 19.
A beam 20 is pierced in the longitudinal direction of the beam 19 so as to be rotatably supported by a bearing, and sheaves 21 are attached to both ends of the shaft 20 with a width substantially the same as that of the sheave 7 to form a moving sheave block 22.

A screw rod 23 is arranged so as to penetrate the beams 12 and 13 at the both ends and the beam 19 of the movable sheave block 22 at substantially central portions in the longitudinal direction, and one beam 12 side of the screw rod 23 is rotatably thrust. Fix the worm 24 and worm wheel on the other beam 13 side protruding end.
A screw driving motor 27 capable of rotating in the normal and reverse directions is connected via a speed reducer 26 such as 25. A screw nut 28 is fixed to the beam 19 penetrating portion of the screw rod 23 so that the moving sheave block 22 can be moved back and forth along the horizontal beam 3 when the screw rod 23 is normally and reversely rotated by the motor 27. In the drawing, 29 is a horizontal guide roller which is built in both ends of the beam 19 and whose rolling surface is in contact with the side end surface of the rail portion 15 of the horizontal beam 3, 30 is a reinforcing member, 31 is for opening and closing the grab. Rope, 32 is a glove support rope.

With the above configuration, when the grab bucket work and the hook work are performed, the screw rod 23 is rotated in one direction by the screw driving motor 27 via the speed reducer 26. Since the tip of the screw rod 23 is thrust-supported, the screw nut 28 screwed in the middle of the screw rod 23 moves to the tip side. Since the screw nut 28 is fixed to the beam 19 of the moving sheave block 22, the rollers 16 and 17 are provided above and below both ends of the beam 19.
And the horizontal guide rollers 29 move the rails 15 of the horizontal beams 3 on both sides to the standby position A side.

At this time, the four ropes 32, 31 are wound and unwound side by side in the same vertical plane, and the grab bucket work and the hook work are performed with two-point support.

When switching to the container hanging work, the screw drive motor 27 is rotated in the reverse direction and the screw rod 23 is rotated in the reverse direction while the grab bucket or hook is replaced with the container spreader 33. The sheave 21 begins to move to the side B, the sheave 21 detours the glove opening / closing rope 31 passing through the sheave 7 to the container working position B side, and the suspension point becomes four points.

When the container 34 is attached to the container spreader 33 and the ropes 31 and 32 are wound up and unwound, and the jib 11 is lifted and lowered to carry the container, the moving sheave block 22
The load applied to the sheave 21 is supported by the horizontal beam 3 via the shaft 20, the beam 19, the screw nut 28, the screw rod 23, and the beam 12. Especially screw nut 28
Since the screw rod 23 is strong against the load in the thrust direction, the suspended point does not move and the suspended load does not tilt.

The jib tip sheave device of the multi-purpose crane according to the present invention is not limited to the above-mentioned embodiment, but a horizontal guide rod 9 is disposed below the top jib 2 as shown in FIG. The standby position A and the container working position B may be reversed, and a chain and a chain block may be used in place of the screw rod and the screw nut within the scope of the present invention. Of course, various changes can be made.

[Advantages of the Invention] As described above, according to the jib tip sheave device of the multi-purpose crane of the present invention, the movable sheave block is provided to the horizontal beam at the tip of the jib so that it can be moved by the drive device. Since the inner two wire rope hanging points are moved, the two-point hanging points and the four-point hanging points can be automatically switched alternately by remote control, which eliminates the need for manpower and speeds up the switching work. Be safe,
Moreover, since the load of the moving sheave block is supported by the horizontal beam, the driving device is not moved by the load of the moving sheave block, so that the operation of inserting the pin for fixing the position of the moving sheave block can be eliminated. In addition, since a direct drive device is provided between the horizontal beam and the moving sheave block, various excellent effects such as quick response can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the device of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the line III-III in FIG. FIG. 7 is a view as seen in the direction of arrows IV-IV in FIG. 1, FIG. 5 is an overall explanatory view of the device shown in FIG. 1, FIG. 6 is an explanatory view of another embodiment of the device of the present invention, and FIG. 8 and 9 are explanatory views of a conventional example, FIG. 7 is an explanatory view of a hook work state, and FIG. 8 is an explanatory view of a container hanging work state. 2 is a top jib, 3 is a horizontal beam, 6 and 7 are sheaves, 9 is a horizontal guide rod, 15 is a rail part, 16 and 17 are rollers, 18
Is a traveling body, 19 is a beam, 20 is a shaft, 21 is a sheave, 22 is a moving sheave block, 23 is a screw rod, 26 is a reducer,
27 is a screw driving motor, and 28 is a screw nut.

Claims (1)

[Scope of utility model registration request] 1. A parallelogram link is formed between the main jib and a tip of a horizontal guide rod which are parallel to each other, and a horizontal beam is pivotally supported so that a horizontal state can be maintained at all times, and four sheaves are coaxially provided at the tip of the main jib. A moving sheave block mounted on a line and provided with two sheaves at substantially the same intervals as the inner two of the sheaves is mounted so as to be horizontally movable along the horizontal beam. A jib tip sheave device for a multi-purpose crane, characterized in that a drive device capable of horizontally moving a moving block is provided between them.