JPS6111193Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a crane boom hoisting device, and in particular, the crane boom is bent around the pivot point of the base end of the boom when the crane boom is suspended diagonally, or around the cylinder device as a power device for hoisting. The present invention relates to a device configured to prevent stress build-up.

Before explaining the details of the present invention, a cargo handling vehicle equipped with a crane boom according to the present invention will be explained. In Fig. 1, A is a traveling vehicle, and B is a crane device, which is generally called a truck crane.A towing device is attached to the rear of traveling vehicle A, and it can also be used as a towing vehicle. . Crane device B includes a swivel base 1 placed on the frame of traveling vehicle A, a boom 3 whose base end is pivoted to the swivel base 1 with a pivot pin 2, and a boom 3 interposed between the boom 3 and the swivel base 1. A luffing cylinder device 4, a hook 5 suspended from the head of the tip of the boom 3 by a steel cable 6
and a winch device 7 mounted on the swivel base 1 for winding and unwinding the steel cable 6.

This crane device B operates by raising and lowering the boom 3 by extending and contracting the cylinder device 4 for raising and lowering, and by the swivel base 1.
The boom 3 is brought to an arbitrary three-dimensional position by combining the rotation movement of the boom 3 with the rotation of the boom 3, and the cargo is suspended by the hook 5 and the winch device 7
The load is lifted or lowered by driving the

Generally, when a load is lifted by crane device B as described above, the top end of the boom is brought approximately on the vertical line of the load, but sometimes due to a visual error on the part of the crane operator or due to location constraints. Sometimes it is unavoidable to hang the product diagonally. In such a case, as shown in FIG. 2, the horizontal component force f ₁ of the lifting load F acts on the crane boom 3 as a lateral pulling force, and around the pivot pin 2,
Alternatively, bending stress may occur in the undulating cylinder device 4 and damage it.

The present invention aims to eliminate such inconveniences, and its gist is to insert a slide box that can be slid in a telescopic manner between the boom and the base to reduce the lateral pulling force mentioned above. This slide box is used to prevent excessive bending stress from acting on the pivot pin 2 and the undulating cylinder device 4.

The details will be explained below by citing three examples of the best mode.

First embodiment In Fig. 3, 1, 2, 3, and 4 are a swivel base, a pivot pin, a boom, and a lifting cylinder device, as explained in Fig. 1. In this embodiment, a slide box 8
is interposed so as to incorporate the above-mentioned hoisting cylinder device 4. The details are as shown in Fig. 4, and a boom side fixing pin 32 is journalled via a bracket 31 on the underside of the boom 3 at an appropriate position, and a base side fixing pin 12 is journalled by a bracket 11 on the upper surface of the swivel base 1 at an appropriate position.

The undulating cylinder device 4 is rotatably attached to the boom-side fixing pin 32 on the rod 41 side and to the base-side fixing pin 12 on the cylinder 42 side via bosses, respectively. In addition, the rod side boss 43 is connected to the boom side fixing pin 32 using a self-aligning ball bearing 44, so that even if lateral gravitational force is applied to the boom 3, no bending stress is generated in the luffing cylinder 4. There is. Next, the slide box 8 is composed of an inner tube 81 and an outer tube 82 having a rectangular cross section, which can be slid telescopically when inserted into each other. The inner cylinder 81 constituting the slide box 8 is connected to the boom 3 side by passing the boom-side fixing pin 32 through the boss 83 at its tip, and the outer cylinder 32 is connected to the boom 3 side by passing the boom side fixing pin 32 through the boss 83 at its base end. It is connected to the swivel base 1 side through a fixing pin 12. Said boss 8
3 and 84 are designed to slide tightly against the supporting pins 32 and 12, respectively, to the extent that rotation is not hindered.
Furthermore, the sliding contact portion between the inner cylinder 81 and the outer cylinder 82 is designed to be as tight as possible. As a result, the slide box 8 is rotatable along the raising and lowering surface of the boom 3, and cannot be moved in a direction perpendicular to the raising and lowering surface of the boom 3.

With this configuration, when the hoisting cylinder device 4 is expanded or contracted, the slide box 8 also expands or contracts accordingly, so the boom 3 can be freely raised or lowered. On the other hand, if a lateral pulling force is applied to the boom 3 The force is received by the slide box 8, more specifically by the sliding parts of the bosses 83 and 84 at both ends of the slide box 8, and the sliding parts of the inner and outer cylinders 81 and 82, so that the pivot pin 2 and the undulations The bending stress acting on the cylinder device 4 can be suppressed as much as possible.

Second Embodiment The second embodiment shown in FIG. 5 is basically the same as the first embodiment and differs only in the following points. That is, the inner cylinder 81 (boss 83) and outer cylinder 82 (boss 84) of the slide box 8 are directly supported by the boom side fixing pin 32 and the base side fixing pin 12, and the luffing cylinder device 4 are indirectly connected via the bosses 83 and 84. As is clear from the figure, the rod-side boss 43 of the undulating cylinder device 4 is pivotally supported by a bracket 85 provided on the boss 83 of the inner cylinder 81.
Similarly, the cylinder-side boss 45 is also pivotally supported by a bracket 86 provided on the boss 84 of the outer cylinder 82. And around boss 83 or boss 8
By providing a slight looseness to the mounting around the 4, it is possible to effectively prevent bending stress from acting on the undulating cylinder device 4. In this embodiment, the bosses 83 and 84 of the inner and outer cylinders can be integrated into one piece instead of being divided into two parts as in the first embodiment, which is advantageous in terms of rigidity and has a high resistance to lateral pulling force. be.

Third Embodiment In the present invention, it is not necessarily necessary to assemble the slide box 8 and the levitation power device together, and it is also possible to install them separately. FIG. 6 shows one such example, in which the slide box 8 and the undulating cylinder device 4 are
is installed separately.

Since the present invention has the above-described structure, it is possible to prevent the occurrence of bending stress due to diagonal suspension, and to effectively prevent damage to the area around the pivot pin 2 and the undulating cylinder device 4.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a cargo handling vehicle equipped with a crane boom according to the present invention, Fig. 2 is a diagram illustrating the state in which it is hung diagonally, Fig. 3 is an overall view of the first embodiment, and Fig. 4 5 is a detailed view of the main part of the first embodiment, FIG. 5 is a detailed view of the main part of the second embodiment, and FIG. 6 is an overall view of the third embodiment.

Claims (1)

[Claims for Utility Model Registration] In a crane boom hoisting device in which the proximal end of the boom is pivoted to a base and the boom is raised and lowered via a power device, between the boom and the base: In addition, a telescopic slide box that expands and contracts as the boom moves up and down is interposed so that it can rotate freely along the boom's up-and-down movement plane, but cannot move in a direction perpendicular to the boom's up-and-down movement plane. A crane boom hoisting device characterized by: