JPH062559B2 - Crane winch mounting device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a winch mounting device for a crane.

2. Description of the Related Art As shown in FIG. 6, in a T-shaped crane in which a boom b is horizontally attached to an upper part of a vertical column a, a winch c is installed on the base end side upper surface of the boom b, and the winch c The winch rope d wound around the sheave i is wound around the sheave i on the hook h side through the sheave f attached to the frame e provided on the upper portion of the support column a and the sheave g provided on the tip side of the boom b.

This is done by increasing the distance between the winch c and the sheave f.
This is for preventing the fleet angle α of the winch c shown in the figure, that is, the angle formed by the plane Y perpendicular to the winch rotation axis X and the winch rope d from exceeding the upper limit defined by the law of the crane.

Problems to be Solved by the Invention The boom b becomes longer because the distance from the support a to the mounting position of the winch c is longer, and the sheave f is installed above the support a, so that the total height of the crane is increased. Not suitable for cranes that are too high and have a height limit when working.

Means and Actions for Solving the Problems A slide sheave and a winch are provided on the upper and lower portions on the opposite side to the hook in the boom of a crane which is T-shaped by a support and a boom, and a winch rope is a winch through the slide sheave. The height of the slide sheave and winch can be reduced by lowering the overall height.

Embodiment FIG. 4 is an overall front view of a mobile crane, and FIG. 5 is a plan view in which the crane is omitted. A working machine frame 3 is rotatably mounted on a vehicle body 1 through a turning mechanism 2. Crane 4 is attached to 3.

The crane 4 is provided with a support column 5 and a boom 6. The support column 5 is a multi-stage telescopic support column in which a plurality of support columns are telescopically inserted into a first support column 7 having a rectangular hollow section, and the boom 6 has a rectangular section. The second and third booms 11 and 12 are telescopically inserted into the hollow first boom 10 by a cylinder (not shown) and the boom top sheave 13 and the hook sheave 14 attached to the tip of the third boom 12. Sheave 16 with winch rope 15 wound around it attached to second boom 11
And a multi-stage telescopic boom wound around a winch 18 attached to the lower base end of the first boom 10 through a slide sheave 17 provided on the upper base end of the first boom 10, and a hook 19 is provided on the hook sheave 14. At the same time, the first and second brackets 20 and 21 are fixed to the first boom 10, and the shaft support pin 23 extends between the first bracket 20 and the bracket 22 fixed to the tip of the final support of the support 5.
And the fixing pin 24 is detachably fitted over the second bracket 21 and the bracket 22, and the fixing pin 24 is pulled out so that the boom 6 is attached to the support column 5 around the pivot pin 23. On the other hand, the T-shaped crane is constructed so that it can rotate in the vertical direction between the horizontal posture and the vertical posture.

Outrigger devices 28 are attached to the four corners of the vehicle body 1, and a wheel arm 36 supporting a wheel 35 is attached to a rear portion of the vehicle body 1 so as to be vertically rotatable. 7, a pair of right and left front links 48, a rear link 45, and a hoisting cylinder 44 are pivotally connected to each other. When the piston rod 44a is expanded and contracted, the support column 5 extends between a standing posture shown by a solid line and a lying posture shown by a virtual line. The lower part of the column 5 and the working machine frame 3 are connected by a connecting mechanism 53.

1, 2 and 3 are front views of the base end portion of the boom 6,
It is a side view and a bottom view, and both side plate 6 of the 1st boom 10 is shown.
Reference numerals 0 and 60 project rearward, and a lower surface plate 61 is fixed between lower end surfaces thereof. The winch 18 is fixed to the lower surface plate 61 with a bolt 63 through a mounting seat 62, and both side surface plates 60, A support shaft 64 is horizontally fixed between the 60, and the slide sheave 17 is attached to the support shaft 64 so as to be movable left and right, and the winch rope 15 is provided.
Through the slide sheave 17 and the cutout portion 61a of the lower surface plate 61.
It is wound around the drum 65 of the winch 18.

Reference numeral 66 is a rope retainer, which is attached between both side plates 60, 60 via a mounting plate 67.

Reference numeral 68 is a telescopic cylinder, and its piston rod 69 is connected to the lower surface plate 61 by a bracket 70 and a pin 71.

Effect of the Invention The distance from the slide sheave 17 to the winch 18 can be increased to make the fleet angle of the winch smaller so as not to exceed the upper limit of the crane regulations, and the height above the boom 6 can be reduced because nothing protrudes above it. It can also be applied to work sites with height restrictions.

Further, since the winch 18 is attached to the side opposite to the hook 19, the winch 18 serves as a counter weight, and the suspended load stability is improved.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a front view of a base end portion of a boom, FIG. 2 is a side view, FIG. 3 is a plan view, and FIG. Fig. 5 is an overall front view, Fig. 5 is a plan view without a crane, Fig. 6 is a front view of a conventional example, and Fig. 7 is an explanatory view of a fleet angle. 5 is a pillar, 6 is a boom, 15 is a winch rope, 17 is a slide sheave, 18 is a winch, and 19 is a hook.

Claims (1)

[Claims] 1. A T-shaped crane in which a boom 6 is attached to an upper portion of a column 5, and a hook 19 in the boom 6 is provided.
A slide sheave 17 is attached to the upper part on the opposite side, and a winch 18 is attached to the lower part on the base end side, and a winch rope 15 is wound around the winch 18 via the slide sheave 17 and a winch attachment device for a crane. .