JPS6127907Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vehicle-type crane used for crane work, etc.

In general, a vehicle-type crane is equipped with a swivel base on the vehicle body and a boom that can be raised and lowered on the swivel base. The main hoist hook is used to lift the suspended load. In addition, some of the above cranes have an auxiliary hoisting wire sheave pivotally supported at the tip of the boom head via a bracket, and this sheave is used when lifting a relatively light load using an auxiliary hoisting hook. It serves as a guide for the auxiliary winding wire that suspends this auxiliary winding hook. Furthermore, the sheave is not only used for lifting work using the auxiliary hoisting hook, but also for guiding the auxiliary hoisting wire when the jib boom is extended in the case of cranes with a jib boom stored on the underside of the boom. It is something. That is, in order to extend the jib boom using the auxiliary hoisting wire, first the base end of the jib boom is rotatably pivoted to the tip of the boom, and the end of the auxiliary hoisting wire is let out to the tip side of the shib boom. Then, the auxiliary winding wire is wound through the sheave and the jib boom is rotated forward of the boom head, thereby extending the jib boom.
However, when extending the jib boom in this manner, the sheave was conventionally positioned at the center of the width of the boom like the main hoist hook suspended from the boom head, so the auxiliary hoist wire was wound. When removing the auxiliary winding wire, the auxiliary winding wire came into contact with the main winding wire, causing damage to the auxiliary winding wire. Additionally, in order to eliminate this problem, it may be possible to prevent the auxiliary hoisting wire from coming into contact with the main hoisting hook when the jib boom is extended by deviating the sheave from the width center of the boom in advance. However, if the sheave is deviated from the center of the width of the boom, torsion or bending moment will act on the boom when lifting with the auxiliary hook using this sheave, causing deformation of the boom itself. There is a risk that it may be easy to invite.

This idea was developed based on these circumstances, and its purpose is to prevent damage to the auxiliary winding wire due to contact with the main hoisting hook when the jib boom is extended, and to prevent damage to the auxiliary winding wire suspended from the tip of the boom head. To provide a vehicle-type crane that does not cause deformation such as twisting or bending of a boom during lifting work using a hoisting hook.

That is, this invention is characterized in that the sheave for the auxiliary winding wire is pivotally supported at the tip of the boom head via a bracket, and is configured to be movable in the width direction of the boom, either alone or together with the bracket.

An embodiment of this invention will be described below with reference to FIGS. 1 to 7.

Figure 1 shows a truck crane as a vehicle-type crane, and 1 in the figure shows the body of the truck crane;
2... are wheels of the vehicle body 1, and 3... are outriggers for ensuring the stability of the vehicle body 1 during crane work. Note that 4 is a driver's seat that controls the steering of the vehicle body 1. A swivel base 5 is provided on the vehicle body 1, and the swivel base 5 is configured to be able to rotate with respect to the vehicle body 1. On this swivel base 5 is a pivot 6.
A multi-stage telescoping boom 7 is pivotally supported through the boom 7 so that it can be raised and lowered freely, and the boom 7 is raised and lowered by a raising and lowering cylinder 8 that is a hydraulic cylinder. A boom head 7a is attached to the tip of the boom 7, and a main hoist hook 11 is suspended from the boom head 7a via a main hoist wire 10 guided by main sheaves 9.
A jib boom 12 is stored along the lower surface of the boom 7. This jib boom 12 is configured such that its base end can be detachably and rotatably pivoted and connected to the boom head 7a via pins 13, 13, and when in use, it is extended out in front of the boom head 7a. It is designed to compensate for the boom length of boom 7. Note that 14 and 14 are holding brackets that hold the jib boom 12 when the jib boom 12 is stored, and 15 is a jib sheave that is pivotally supported at the tip of the jib boom 12. Further, 16 is a driver's seat provided on the swivel base 5 for crane work.

A bracket 17 is rotatably attached to the tip of the boom head 7a via pins 18, 18, and a sheave for the auxiliary winding wire, so-called Rooster sheave 1, is attached to the bracket 17.
9 is provided. This Rooster Sheave 19
is rotatably attached to the bracket 17 via the sheave shaft 20, and this Rooster sheave 1
Reference numeral 9 guides the auxiliary winding wire 22 when the jib boom 12 is extended and when the auxiliary winding hook 21 is used for lifting work. Note that the auxiliary winding wire 22 and the main winding wire 10 are fed out and wound up by a winch mechanism (not shown) disposed on the swivel base 5. Further, 23 is a locking bracket that locks the end of the auxiliary winding wire 22 when the jib boom 12 is extended.

In this embodiment, the Rooster sheave 19 is rotatably attached to a sheave receiver 24 that is movable with respect to the sheave shaft 20.
By moving this sheave receiver 24, this Rooster sheave 19 can be moved in the width direction of the boom 7. Further, a positioning member 25 for the Rooster sheave 19 is attached to the sheave receiver 24, and this positioning member 25 is attached to the bracket 17.
By connecting the rooster sheave 19 with the fixing pins 26, 26, the rooster sheave 19 can be positioned and fixed at the width center X of the boom 7 or at a position offset from the width center X by a predetermined amount l, respectively. ing.

The truck crane of this embodiment with such a configuration mainly uses the main hoisting hook 11 to lift a suspended load. By suspending the auxiliary hoisting hook 21 via the auxiliary hoisting wire 22 guided by the rooster sheave 19, as shown in FIG. be. In addition, when performing lifting work in this manner, if the Rooster sheave 19 is positioned at the width center X of the boom 7 as shown in FIG.
Since the line of action of the hanging load can be made to coincide with the width center X, it is possible to prevent the boom 7 itself from being deformed due to twisting, bending, etc. due to the hanging load.

When extending the jib boom 12 using the rooster sheave 19, first extend the rooster sheave 19 by a predetermined amount l from the width center Let's move it. The base end of the jib boom 12 is rotatably supported on the boom head 7a, and the auxiliary winding wire 22 guided by the rooster sheave 19 is connected to the jib boom 12.
The jib sheave 15 leads to the locking bracket 23, and its end is locked to the locking bracket 23. After this, the jib boom 12 is attached to the holding brackets 14, 14 as shown in FIG.
Remove this jib boom 12 from the auxiliary winding wire 2
2 while rotating the boom head 7a to the front side. At this time, the auxiliary winding wire 22 is let out as the jib boom 12 rotates. Then, after changing the end of the auxiliary winding wire 22 from the locking bracket 23 to the tip of the jib boom 12, the jib boom 12 is further rotated while winding the auxiliary winding wire 22. , this jib boom 12 is connected to the boom head 7
It protrudes in front of a. If the jib boom 12 is extended in this manner, the rooster sheave 19 is deviated from the width center Since the auxiliary winding wire 22 is stretched diagonally between the jib sheave 15 and the main winding hook 11, contact between the auxiliary winding wire 22 and the main winding hook 11 can be avoided. Therefore, the auxiliary winding wire 22 is not rubbed by these contacts, and damage to the auxiliary winding wire 22 can be prevented.

Furthermore, when the jib boom 12 is extended, the auxiliary hoist hook 21 is suspended from the jib sheave 15 of the jib boom 12 via the auxiliary hoist wire 22, thereby increasing the lifting height of the suspended load and expanding the working radius. It is possible to achieve this goal.

Note that this invention is not limited to the above embodiment. For example, in this embodiment, the rooster sheave itself is configured to be movable in the width direction of the boom, but as shown in FIGS. 8 and 9, the bracket 30 is attached to the boom head 7a via a link 31. The rooster sheave 19 may be configured to be movable along with the bracket 30 in the width direction of the boom 7. Furthermore, the link structure is not limited to the link 31 described above, and the link 41 shown in FIGS. 10 and 11 may be used.Furthermore, the link structure is not limited to the link structure; The bracket 50 can be slid in the width direction with respect to the boom head 7a, and the bracket 50 is fixed to the boom head 7a with a fixing pin 51.
It may also be possible to make positioning possible. Furthermore, although this embodiment has been described as being applied to a truck crane, it goes without saying that it can also be applied to vehicle-type cranes such as wheel cranes.

As explained above, this invention provides a sheave for the auxiliary winding wire that is pivotally supported at the tip of the boom head via a bracket so that this sheave itself or the entire bracket can be moved in the width direction of the boom, and the sheave for the auxiliary winding wire is Alternatively, the present invention is characterized in that positioning means for fixing the bracket at a moving position is provided. Therefore, when suspending the auxiliary hoisting hook from the sheave via the auxiliary hoisting wire and performing lifting work using this auxiliary hoisting hook, the sheave must be positioned at the center of the width of the boom and fixed at this position. By doing so, you can prevent the boom from deforming due to twisting or bending. In addition, when using the above sheave to extend the jib boom, this sheave is offset from the width center of the boom and fixed in this position to avoid contact between the auxiliary hoist wire and the main hoist hook. This provides excellent effects such as being able to prevent damage to the auxiliary winding wire.

[Brief explanation of the drawing]

Figures 1 to 7 show one embodiment of this invention, with Figure 1 being a side view of the truck crane, Figure 2 being a plan view of the boom head, Figure 3 being a front view of the boom head, and Figure 4 being a supplementary crane. Figure 5 is a side view of the boom head during lifting work using the hoisting hook; Figure 5 is a front view of the boom head during the lifting work described above; Figure 6 is a side view of the boom when the jib boom is extended; Figure 7 is the front view of the boom when the jib boom is extended. It is a diagram. Figures 8 to 13 show other embodiments of this invention,
Figures 8 and 9, Figures 10 and 11,
FIGS. 12 and 13 are plan views showing the mounting structure of the bracket to the boom head, respectively. 1...Vehicle body, 5...Swivel base, 7...Boom, 7
a...Boom head, 10...Main winding wire, 11
...Main hoist hook, 12...Jib boom, 17,3
0, 50... Bracket, 19... Rooster sheave (sheave for auxiliary winding wire), 21... Auxiliary winding hook, 22... Auxiliary winding wire.

Claims (1)

[Scope of utility model registration request] A vehicle body, a swivel base provided on the vehicle body, a multistage telescoping boom pivotably supported on the swivel base, and a main winding wire from a boom head attached to the tip of the boom. The main hoist hook is suspended through the main hoist hook, the jib boom is stored along the lower surface of the boom and is extended in front of the boom head when in use, and the jib boom is pivotally supported at the tip of the boom head via a bracket. In a vehicle type crane equipped with an auxiliary hoisting wire sheave that guides the auxiliary hoisting wire during tensioning and lifting work using the auxiliary hoisting hook, the auxiliary hoisting wire sheave itself or the entire bracket can be moved in the width direction of the boom. A vehicle type crane, further comprising positioning means for fixing the sheave for the auxiliary winding wire or the bracket at a moving position.