JPH0743438U - Mobile crane - Google Patents

Abstract

(57) [Summary] [Purpose] The wire ropes for hooks do not intersect when the boom is raised and lowered, and the vertical movement of the hooks is facilitated. [Structure] Boom 4 is mounted on swivel base 3 mounted on top of vehicle body 2.
Is installed so that it can be undulated. A winch 8 including a drive unit and a drum for operating the wire rope 10 for the hook 11 is attached to the end of the boom 4. Therefore, even if the boom 4 is turned up and down, the wire ropes 10 on which the hooks 11 are suspended do not cross each other. Therefore, the vertical movement operation of the hook 11 can be smoothly performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mobile crane for hoisting and moving a load, and particularly to a mobile crane having a winch for suspending a load attached to a tip of a boom which can be raised and lowered by 180 degrees.

[0002]

[Prior art]

 As shown in FIG. 3, conventionally, when the boom 22 is moved rearward or forward from a crane vehicle 21 or the like, the boom is horizontally swung by a swivel base 23 or a narrow place. In the field where there are obstacles around the boom 27, the boom 22 is raised and lowered 180 degrees in the vertical direction indicated by the arrow on the swivel 23 to move the suspended load 27.

[0003]

[Problems to be solved by the device]

 However, since the winch 25 for the hook 24 is attached to the upper surface of the boom 22 in the conventional mobile crane or the like, when the boom 22 is vertically undulated and moved, the wire rope 26 that suspends the hook 24 causes the boom 24 to move. 22 may intersect in the vicinity of the tip of the hook 22 and interfere with the vertical movement operation of the hook 24 thereafter. An object of the present invention is to provide a crane vehicle that can smoothly perform vertical movement operations without the wire ropes intermingling even when the boom is vertically undulated and turned.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a crane vehicle in which a boom is mounted on a swivel mounted on a vehicle body so as to be capable of vertically elevating 180 degrees, and a winch for hook operation is attached to a tip of the boom. It is characterized by

[0005]

[Action]

 Rotate the boom up and down from the front or in the opposite direction. The tip of the boom gradually rises on the swivel base to a vertical position, and then oscillates in the opposite direction. At the same time, the hook hanging on the winch at the tip of the boom also moves. Even if the boom is raised and lowered in this way, the winch for the hook is attached to the tip of the boom, so that the wire rope for the hook does not intersect and the hook moves. Therefore, the subsequent vertical movement operation of the hook can be smoothly performed.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, a mobile crane 1 has a swivel base 3 mounted on the upper part of a vehicle body 2 so as to be horizontally rotatable by 360 degrees, and an expandable boom 4 is mounted on the swivel base 3. A hoisting means 5 is provided between the swivel 3 and the boom 4, and the hoisting means 5 is composed of a motor M and a gear 7 meshing with a gear 6 of the motor M. Further, as the undulating means 5, a mechanism such as a rack, a pinion or the like can be adopted in addition to this embodiment.

A winch 8 for winding a wire rope 10 with a hook 11 suspended is attached to the tip of the boom 4. The winch 8 is composed of a drum 9 for winding the wire rope 10 and a drive unit 12 for driving the drum 9. The drive unit 12 is an electric motor or a hydraulic motor.

Next, the operation of this embodiment will be described. When the boom 4 is moved from the front to the rear or from the rear to the front at the work site, the swivel base 3 is normally rotated to move the boom 4. However, when the work site is narrow or there is an obstacle around the work site and the boom 4 cannot be turned, the boom 4 must be undulated in the vertical direction indicated by the arrow A in FIG. 1 to move the suspended load 13. Not.

In this case, the motor M of the hoisting means 5 is actuated, the gear 6 and the gear 7 of the motor M are rotated, and the boom 4 is hoisted and rotated in the arrow direction shown in FIG. The undulating rotation of the boom 4 is possible up to 180 degrees as shown by the chain line. The boom 4 gradually rises at its tip on the swivel base 3, passes through the vertical state, and then moves in the opposite direction.

At the same time, the hook 11 suspended by the winch 8 at the tip of the boom 4 also moves in the opposite direction. At this time, since the winch 8 for operating the wire rope 10 is attached to the tip of the boom 4, the wire rope 10 can move the hook 11 without crossing. Therefore, the vertical movement operation of the hook 11 after the movement can be smoothly performed. As described above, according to the present embodiment, even when the work site is narrow and the swivel base cannot be swung, the boom 4 is vertically swung up and down to smoothly move the suspended load 13. You can

[0011]

[Effect of device]

 Since the present invention is configured as described above, the wire ropes do not intersect even when the boom is raised and lowered in the vertical direction, and the vertical movement operation of the hook can be performed smoothly. Therefore, even in a narrow space or a work site with obstacles around it, the lifting work can be carried out smoothly and safely, and the work efficiency is improved.

[Brief description of drawings]

FIG. 1 is a side view of this embodiment.

FIG. 2 is a plan view of this embodiment.

FIG. 3 is a side view of a conventional example.

[Explanation of symbols]

 1,21 Crane vehicle 2 Vehicle body 3,23 Swiveling base 4,22 Boom 5 Raising / lowering means 6,7 Gear 8 Winch 9,24 Hook 10 Wire rope 11 Drum 12 Drive part 13,27 Suspended load

Claims (1)

[Scope of utility model registration request] 1. A mobile crane mounted on a vehicle body so that a boom can be lifted 180 degrees in a vertical direction. A mobile crane equipped with a winch for operating a hook at a tip of the boom.