JP2516881Y2 - Mobile crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mobile crane.

(Prior Art) Conventionally, in this type of mobile crane, as shown in FIG. 5, a swivel base 2 is disposed on a vehicle 1 so as to be freely rotatable, and a base end portion of the swivel base 2 is pivotally supported. The boom 3 is arranged. The telescopic boom 3 includes a base boom 4, a first intermediate boom 5,
It is composed of a second intermediate boom 6 and a front boom 7, and the base boom 4 has a first middle boom 5, the first middle boom 5 has a second middle boom 6, and the second middle boom 6 has a front boom 7. It can be freely inserted and inserted, and an appropriate expansion and contraction drive means is arranged between each boom (although not shown, a hydraulic cylinder etc. is arranged).
However, it can be driven to expand and contract. A hydraulic cylinder 8 is arranged between the base boom 4 and the swivel base 2, and the telescopic boom 3 can be moved up and down by driving the hydraulic cylinder 8. A main winch 10 around which a main wire rope 9 is wound and a sub winch 12 around which a sub wire rope 11 is wound are attached to the swivel base 2. Main wire rope 9 from the main winch 10
Is the sheave 13 attached to the base end of the base boom 4 and the sheave 14 projecting upward from the upper side surface of the front end portion of the front boom 7, and the lower surface of the telescopic boom 3 is attached to the front end portion of the front boom 7. A plurality of sheaves 15, 15 protruding from the bottom
..And multiple sheaves 17,17, arranged on hook block 16
······················· s between the ends of the booms 7 or the hook blocks 16 at appropriate positions. The number of times the main wire rope 9 is laid between the sheave 15 and the sheave 17 arranged on the hook block 16 is naturally determined by the boom length of the telescopic boom 3 and the load suspended on the telescopic boom 3, and the content of the crane work. The operator can change the number of times of wrapping around. The sub wire rope 11 extended from the sub winch 12 is used when using a jib that is replenished from the tip of the telescopic boom 3. That is, as shown in FIG. 6, the jib 18 is composed of a plurality of lattice parts and is formed by connecting these lattice parts. The base end portion of the jib 18 is pivotally supported by the tip boom 7 of the telescopic boom 3 and the telescopic boom is formed. It is added from the tip of 3. Mast 19 on tip boom 7
The base end portion of is also pivotally supported, and the tip end portion of the mast 19 and the tip end portion of the jib 18 are connected by a tension rope 20. Further, a tension rope 22 which is connected to an equalizer sheave 21 is connected to the end portion of the mast 19 and is arranged. The main wire rope 9 fed from the main winch 10 is attached to the equalizer sheave 21. It is hung around. Therefore, the jib 18 is supported by the tension ropes 20 and 22 and the main wire rope 9, and the main winch 10
The jib 18 can be driven up and down by hoisting and lowering. The sub wire rope 11 extended from the sub winch 12 includes a sheave 23 arranged in the middle of the mast 19 and a tip sheave arranged at the tip of the jib 18.
After 24, the tip end is locked to the sub hook 25. When the jib 18 configured as described above is used, a suspended load is hung on the sub-hook 25 for crane work, and it is used particularly when a lifting height and a working radius are required.

(Problems of Prior Art) However, the mobile crane configured as described above has the following problems. That is, with the mobile crane in the state as shown in FIG. 5, the sheaves 15, 15, ... Arranged on the tip boom 7 of the telescopic boom 3 and the sheaves 17, 17 ,. When changing the number of times the main wire rope 9 is hung between
Since the diameter of the main wire rope 9 is comparatively large, it is heavy, and the main wire rope 9 is attached to each sheave 15,15, ..., 1.
It was difficult for the operator to manually perform the work along 7, 17, ....

The purpose of the present invention is to solve the above problems.

(Means for Solving Problems) A mobile crane according to the present invention comprises a swivel rotatably arranged on a vehicle, a telescopic boom whose base end is pivotally supported by the swivel, and a slewing boom. A mobile crane equipped with a winch attached to a table and wound with a wire rope, and a hook block hung up so that it can be hoisted and unwound from a sheave arranged at the tip of the telescopic boom by the wire rope unwound from the winch. In particular, a plurality of sheaves arranged at the tip of the telescopic boom are arranged so as to project downward from the lower side surface of the telescopic boom, and a plurality of sheaves are also arranged on the hook block. In the structure in which the number of hooks of the wire rope between the telescopic booms can be changed, Inches are arranged, and the tip end of the small-diameter rope extended from the small winch and the tip end of the wire rope extended from the winch are configured to be engageable with and disengageable from each other.

(Operation) With the mobile crane of the present invention having the above-described structure, when changing the number of wire ropes between the end of the telescopic boom and each sheave of the hook block, the small diameter rope extended from the small winch is extended and contracted. After multiplying the required number of sheaves between the sheaves between the boom tip and the hook block, the tip of the small diameter rope and the tip of the wire rope are locked. Then, the wire rope can be hung around the tip portion of the telescopic boom and the hook block with a desired number of hooks by winding the wire rope from the winch and winding the small diameter rope with the small winch. After that, unlock the tip of the small-diameter rope and the tip of the wire rope and lock the tip of the wire rope at the tip of the telescopic boom or at a suitable position on the hook block. Finish the work of changing the number of wire ropes. In this way, when changing the number of wire ropes between the tip of the telescopic boom and the hook block,
A small-diameter rope extended from a small winch may be hung between each sheave between the tip of the telescopic boom and the hook block. Since it is not necessary to hang it around, it is possible to easily handle the wire rope changing work.

(Embodiment) An embodiment of the mobile crane of the present invention will be described below with reference to FIGS. 1 to 4. In describing the mobile crane of the present invention, a case where the present invention is applied to a conventional mobile crane will be described below. Therefore, reference numerals 1 to 25 described in the prior art as shown in FIGS.
In the following description, the same reference numerals will be used to describe the same, and description of these reference numerals will be omitted. In FIG. 1, 26 is a small winch in which a small diameter rope 27 is wound around its drum, and is attached to the lower surface of the base boom 4 via a bracket 28 to which the rod end of the hydraulic cylinder 8 is attached. As shown in FIG. 2, the small winch 26 is attached to the right side of the lower side surface of the base boom 4 in a front view as deviated. The small winch 26 is equipped with a hydraulic motor and decelerator, and is hydraulically driven to provide a small diameter rope 27.
It is designed to rotate the wound drum. A relief valve is used in the oil passage on the winding side of the hydraulic motor of the small winch 26. This is because when the small diameter rope 27 is wound up by the small winch 26, the relief valve does not apply a driving pressure higher than a predetermined value, and the small winch 26 makes it impossible to wind it with a torque higher than a predetermined value. It is a thing. As shown in FIG. 3, the tip portion of the small-diameter rope 27 fed from the small winch 26 is eye-processed to prevent the tip from being compressed. Reference numeral 29 denotes a joint, one end of which is fixedly attached to the tip of the main wire rope 9 and the other end is notched in a concave shape, and the tip portion of the small diameter rope 27 that is eye-processed is inserted into this concave portion, By tightening the bolt 30 from one side of the joint 29, the tip end of the main wire rope 9 and the tip end of the small diameter rope 27 are engaged as shown in FIG. 3, and the engagement is released by reversing the above. It is possible. Reference numerals 31 and 32 denote locking portions that are attached to the tip portion of the front boom 7 and the hook block 16 and lock the tip portion of the main wire rope 9.

The mobile crane of the present invention constructed as described above operates as follows. That is, the telescopic boom 3
When the number of hooks of the main wire rope 9 between the sheaves 15, 15, ... arranged on the tip boom 7 and the sheaves 17, 17, ... of the hook block 16 is changed, the main wire rope 9 is fed out from the small winch 26. The small-diameter rope 27 is arranged between the sheaves 15, 15, ..., Which are arranged on the tip boom 7 of the telescopic boom 3 and the sheaves 17, 17 ,. After wrapping around 27, the tip of the small diameter rope 27 and the tip of the main wire rope 9 are locked as shown in FIG. Then, the small winch 26 is driven so that the small diameter rope 27 is drawn in, and the main wire rope 9 is drawn out from the main winch 10 and the main wire rope 9
The small-diameter rope 27 is wound up by the small winch 26 by the amount unrolled. In this way, the main wire rope 9 is provided between the sheaves between the end portion of the telescopic boom 3 and the hook block 16.
Multiply by the desired number of multiplications. After that, the front end of the main wire rope 9 is released from the engagement between the tip end of the small diameter rope 27 and the main wire rope 9, and the front end of the main wire rope 9 is attached to the engagement portion 31 or the hook block 16 provided at the tip end of the front boom 7. By engaging with the engaging portion 32, the work of changing the number of hooks of the main wire rope 9 between the end portion of the telescopic boom 3 and the hook block 16 is completed. When changing the number of main wire ropes 9 between the tip of the telescopic boom 3 and the hook block 16 in this way, the small winch 26 is extended between the sheaves between the tip of the telescopic boom 3 and the hook block 16. It is sufficient to hang a small-diameter rope 27 around the main wire rope 9 directly and connect it to the tip of the telescopic boom 3 and the hook block as in the conventional case.
Since it is not necessary to hang it between the sheaves among the 16 sheaves, it is possible to easily handle the work of changing the main wire rope 9. The small winch 26 is attached to the lower side surface of the base boom 4 via the bracket 28 as shown in FIG. The small diameter rope 27 is prevented from coming into contact with the lower end side surface portion of the base boom 4 when the small diameter rope 27 is hung around. Further, regardless of the number of main wire ropes 9 hung between the end portion of the telescopic boom 3 and the hook block 16, the end portion of the main wire rope 9 is located on the right side as shown in FIG. Since it is locked to 32, the mounting position of the small winch 26 is also shifted and mounted to the right side when viewed from the front as shown in FIG. This is a small winch with a narrow drum width.
Even if it is 26, it is possible to wind the small diameter rope 27 without deviating.

In the above embodiment, the case where the small winch 26 is used when changing the number of times the main wire rope 9 is hung up has been described, but when the jib 18 is used, the small winch 26 is extended from the sub winch 12 to the tip sheave 24 of the jib 18. The small winch 26 can be used also when the sub wire rope 11 is hung. That is, as shown in FIG.
Sheave 15 with a small diameter rope 27 fed from a small winch 26
After passing through the top, fold back at the tip sheave 24, auxiliary rope
It is locked to the tip of the sub wire rope 11 via 33.
The small-diameter rope 27 and the auxiliary rope 33, and the auxiliary rope 33 and the tip of the sub-wire rope 11 may be locked as shown in FIG. 3, respectively. And drive the small winch 26 so that the small diameter rope 27 is drawn in,
Pull out the sub wire rope 11 from the sub winch 12,
The small-diameter rope 27 is wound up by the small winch 26 by the amount of the sub-wire rope 11 fed from the sub-winch 12. When the tip of the sub wire rope 11 has passed the tip sheave 24, the sub wire rope 11 is paid out from the sub winch 12 and the driving of the small winch 26 is stopped, and the tip of the small diameter rope 27 and the auxiliary rope 33 are locked, The work is completed by unlocking the auxiliary rope 33 and the sub wire rope 11 and attaching the sub hook 25 to the tip of the sub wire rope 11. To stop using the jib 18, reverse the above procedure. Also in this case, the tip end of the sub wire rope 11 having a relatively large rope diameter does not have to be transported from the swivel base 2 to the tip of the jib 18, only the relatively light small diameter rope 27 needs to be transported. Can be simplified. If the length of the jib 18 is short, the auxiliary rope 33
Need not be used.

(Effect of the Invention) Since the present invention is configured and operates as described above, it is possible to easily handle the wire rope changing work, which is a great effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are explanatory views for explaining a mobile crane of the present invention, FIG. 4 is an explanatory view for explaining an example of development of the mobile crane of the present invention, and FIG. Drawing and Drawing 6 are explanatory views explaining the conventional mobile crane. 1: vehicle, 2: swivel, 3: telescopic boom, 9: wire rope, 1
0: winch, 15: sheave, 17: sheave, 26: small winch, 27: small diameter rope

Claims (1)

(57) [Scope of utility model registration request] Claims: 1. A swivel rotatably arranged on a vehicle, a telescopic boom whose base end is pivotally supported by the swivel and which can be raised and lowered, a winch attached to the swivel and wound with a wire rope, and A mobile crane equipped with a hook block that can be hoisted and hoisted down from a sheave arranged at the tip of a telescopic boom by the wire rope paid out from this winch, and is particularly arranged at the tip of the telescopic boom. A plurality of sheaves are arranged so as to project downward from the lower side of the telescopic boom, and a plurality of sheaves are also arranged on the hook block, so that the number of wire ropes between the tip of the telescopic boom and the hook block can be changed. In the configured one, a small winch wound with a small diameter rope is arranged on the lower side of the base end side of the telescopic boom, and is extended from this small winch. Mobile crane, characterized in that the mutually detachably constituting the distal portion of the wire rope unwound from the tip and winch small diameter ropes.