JP3276098B2 - Weight mounting structure for mobile construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching weights to a crawler type lower traveling body in a mobile construction machine such as a crane or a bucket-based excavator using a crane as a base machine.

[0002]

2. Description of the Related Art FIG. 7A is a side view of a movable crane showing a conventional weight mounting structure in a crane.
(B) is a front view of the crane, in which a boom is omitted. The crane has an upper revolving unit 3 installed on a crawler-type lower traveling unit 1 via a revolving device 2, and a boom 4 is attached to the upper revolving unit 3. The wire rope 7 hanging from the top of the boom 4 is wound up by the hoisting winch 6 mounted on the upper swing body 3 and wound up and pulled out by the hoisting winch 6 mounted on the upper swing body 3. The load suspended by the rope 7 is wound up and down.

[0003] In such a mobile crane, the limited load that can be lifted by the crane is, as shown by a dotted line in Fig. 8, the weight of the main body composed of the lower traveling unit 1, the turning device 2 and the upper turning unit 3, and the boom. 4 (working radius). In such a crane, for example, in order to cope with temporary special work or seasonal work by increasing the load that can be lifted, a weight 9 is further added on a counter weight 8 mounted on the rear part of the upper swing body 3, A weight 11 is attached to the front and rear of a track frame 10 on which the device 2 is mounted, and a weight 13 is attached to an outer surface of a side frame 12 constituting the lower traveling unit 1. The solid line in FIG. 8 shows the curve of the limit load that can be lifted with respect to the working radius increased by adding the weights 9, 11, and 13.

As shown in FIGS. 7A and 7B, a conventional weight 13 is attached to the side frame 12 by attaching a weight 13 integrally formed to a bracket 14 provided on an outer surface of the side frame 12. This is performed by connecting and mounting the mounting portions 15 provided on the base 13.

[0005]

On the outer surface of the side frame 12 on which the weight 13 is to be mounted, beams 10a provided on both sides of the track frame 10 are slidably provided for widening the lower traveling body 1. A guide tube 16 to be fitted is provided on the outer surface of the side frame 12 so as to protrude outward, and a pipe tube 17 and the like are provided so as to protrude from the outer surface of the side frame 12. Conventionally, a weight 13 attached to the side frame 12 has an integral weight 1 outside the guide cylinder 16 and the pipe cylinder 17.
3, the weight 13 protrudes outward from the shoe (track link) 1a, the width of the entire machine increases, and the weight 13 hits other machinery at the work site during movement. Machines may be damaged. Further, when the weight 13 protrudes outward from the shoe 1a, a work space required for the work is widened, so that the weight 13 cannot be attached at a narrow site, so that the crane cannot be operated at the maximum capacity.

If the outward projection width of the weight 13 is reduced, the heavy weight 13 cannot be attached to the side frame 12, and the weight 9 or the like added on the counter weight 8 is accordingly reduced. Must be increased, and as a result, the strength of the frame of the upper swing body 3 must also be increased.
There was a problem that weight was increased. Also, as a result,
Since the center of gravity of the crane is raised, there is a problem that the stability is reduced and the inertia force at the time of turning is increased, so that the crane is easily shifted from a target turning stop position.

Further, since the weights 13 are integrally attached to the left and right side frames 12, there is a problem that the weight limit attached to the side frames 12 cannot finely adjust the limit load.

The present invention has been made in view of the above-mentioned problems of the prior art,
Weights can be attached to the side frame without increasing the width of the machine as much or at all, and the weight of the weight attached to the side frame can be increased, thereby reducing the weight added to the upper structure. It is an object of the present invention to provide a weight mounting structure in a mobile construction machine.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a mobile construction machine having a crawler-type lower traveling body, and to a mobile construction machine having a crawler-type lower traveling body. between the projecting portion outwardly of the outer surface of the side frame is provided with a weight mounting bracket, front
On the weight mounting bracket above the weight
Attach the weight mounting bracket to the corresponding location.
And a recess for receiving the weight.
A locking portion for locking to the mounting bracket is provided.
When the rope is lifted on the outer surface of the
The provided hanging portion side frame facing surface facing downward, before
Contact the lower outer surface of the weight on the side frame
A rod to be fixed and a bracket to insert the rod
The weight is suspended by connecting a rope to the suspension
And the locking portion of the weight is
Lower the rope by locking it to the weight mounting bracket
The lower part of the lock by its own weight.
And the weight mounting bracket is
The rod is accommodated in the upper part and the upper part is fixed.
The lower outer surface is in contact with the rod
And the lower portion is fixed while being prevented from moving .

[0010]

According to the present invention, the weights are dispersed and attached between the projecting portions on the outer surface of the side frame,
The space between the outer surface of the side frame and the outer end of the shoe can be effectively used as a space for mounting the weight, reducing or eliminating the outward projection of the weight, and adding weight to the upper revolving unit. Can be reduced.

[0011]

1 is a plan view of an undercarriage showing an embodiment of the present invention, and FIG. 2 is a side view thereof. Reference numeral 20 denotes a weight added to the side frame 12 according to the present invention. The weight 20 includes a guide cylinder 16 that slidably fits an end of the track frame 10, a pipe cylinder 17, and a drive wheel 21. Adjuster 24 and rib 25 for adjusting the position of driving device 22 and driven wheel 23 to prevent loosening of shoe 1a.
For example, they are dispersedly arranged between portions protruding from the outer surface 12a of the side frame 12 (the outer surface of the vertical plate 12b).

FIG. 3 is a side view showing the mounting structure of the weight 20 of this embodiment, FIG. 4 is a front view thereof, FIG. 5 is a rear view of the weight 20 of this embodiment, and FIG. Each side frame 12 has two weights.
At each time, a pair of weight mounting brackets 26 having locking recesses 26a (see FIG. 6) is fixed to the upper portion of the outer surface 12a of the outer vertical plate 12b by welding or the like.
A bracket 28 having a hole into which a rod 35 for preventing the coming off is inserted is fixed by welding or the like to the lower part of the bracket.

On the other hand, the weight 20 is a block having a rectangular thick plate shape, and a concave portion 20a is provided in the upper corner of the weight 20 on both sides of the side frame 12 side.
A rod 30 constituting a locking portion for locking in the concave portion 26a of the bracket 26 is implanted into the weight 20 at one end thereof, and the other end is supported by the support piece 31 (the base end of the support piece 31 is connected to the weight 20). (Fixed by the pin 32).

At the center of the outer surface of the weight 20, a recess 2 is provided.
0b, and a rope 3 such as a crane is provided in the recess 20b.
3, the shackle 34 constituting a suspension portion for lifting the weight 20 by two
One small weight 20 is provided.

As shown in FIG. 6, these weights 20 are attached by means of hanging a hook attached to a rope 33 of another small crane to another shackle connected to a shackle 34 or a rope 33 or the like. The rod 30 of the weight 20 and the bracket 2
6, the weight 20 pivots downward around the rod 30 by its own weight by lowering the rope 33, and as shown in FIG. 12 lower edge 12c
, And in this state, the rod 35 is inserted into the brackets 28 on both sides of the weight 20 to contact the lower outer surface of the weight 20 to prevent the weight 20 from moving outward, thereby fixing the weight 20. . The removal of the weight 20 is performed in the reverse procedure.

As described above, the outer surface 1 of the side frame 12 is
Since the weights 20 are dispersedly mounted between the protrusions 2a, the space between the outer surface 12a of the side frame 12 and the outer end of the shoe 1a can be effectively used as a space for mounting the weights. The weight 20 can be accommodated within the width of the shoe 1a without projecting the weight 20 outward from the shoe 1a as shown in the embodiment. Therefore, the weight 20 can be attached to the side frame 12 without significantly increasing the width of the entire machine or without increasing it at all, so that the weight 20 does not collide with other machines. Further, if the weight 20 does not protrude from the shoe 1a as in the present embodiment, it is not necessary to remove the weight 20 even when transported by the trailer, and the disassembling time and setup time involved in transporting the crane can be reduced.

In addition, since the space which was not used for attaching the weight in the past is used for attaching the weight 20, the additional weight of the weight to the side frame 12 can be increased as compared with the related art. The additional weight 9 on the counter weight 8 can be reduced. As a result, the strength of the frame of the upper swing body 3 does not need to be increased, and the upper swing body 3 does not become large and heavy. In addition, since the center of gravity of the crane is lowered, the stability is improved, and the inertia force at the time of turning is reduced, the shift of the stop position in the turning operation is eliminated, and the turning operation is stabilized and facilitated. In addition, by selecting and attaching the number and type of the weights 20 according to the weight of the suspended load of the crane, the work can be performed in an optimally mounted state with the additional weights without excessively increasing the additional weights. In addition, weight 2
The mounting of the "0" can be easily performed by a small crane which is smaller than the conventional one.

In this embodiment, the weight 20
The locking portion (rod 30) of the bracket 26 with the concave portion 26a of the bracket 26.
To the weight 20 using its own weight.
By simply lowering the weight, the weight 20 rotates by its own weight and is attached to the side frame 12 and can be removed by the reverse operation, so that the weight 20 can be easily and stably attached and detached.

The present invention is applicable not only to cranes but also to other mobile construction machines that perform work by adding an additional weight to the main body, such as an excavator that performs an excavation work by attaching a clamshell bucket with a wire rope hanging from a boom. Can be used.

[0020]

According to the first aspect of the present invention, the weight is distributed and mounted between the projecting portions of the outer surface of the side frame, so that the weight can be mounted without increasing the width of the entire machine so much. It is possible to prevent the occurrence of an accident in which the additional weight collides with other machinery on the site and is damaged. In addition, since the weight can be attached without significantly increasing the width of the entire machine, the work space required for work can be small, so the work can be done by attaching the weight to the side frame even in a narrow site, and the crane can be operated at the maximum capacity. Can work.

Further, since the space on the outer surface of the side frame, which has not been conventionally used, can be effectively used for mounting the weight, it is possible to increase the weight of the weight mounted on the side frame. Can be reduced, and the size and weight of the upper swing body can be prevented. In addition, along with this, the turning operation is stabilized, and the turning operation is facilitated.

In addition, since the additional weight of the additional weight can be selected finely, the work can be performed with the additional weight optimally mounted for the hanging load without mounting an unnecessarily large weight. Further, the attachment of the weight to the side frame can be easily performed by a small-sized crane that is smaller than the conventional one.

[0023]

Further, the engaging portion of the weight is engaged to the bracket, by unloading a hanging rope weight is pivoted by its own weight, and the rod against the outer surface of the weight
The weight is fixed to the side frame with the weight fixed, and the weight can be removed by the reverse operation, so that the weight can be easily and stably attached and detached.

[Brief description of the drawings]

FIG. 1 is a plan view of an undercarriage showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a side view showing a weight mounting structure of the embodiment.

FIG. 4 is a front view of the weight according to the embodiment.

FIG. 5 is a rear view of the weight according to the embodiment.

FIG. 6 is an explanatory diagram of a weight attaching operation of the present embodiment.

FIG. 7A is a side view of a mobile crane showing a conventional weight mounting structure of the crane, and FIG. 7B is a front view showing the crane without a boom.

FIG. 8 is a correlation diagram between a working radius and a hanging load for explaining an increase in a hanging load due to the addition of a weight to the crane body.

[Explanation of symbols]

1: Lower traveling body, 1a: shoe, 10: track frame, 10a: beam, 12: side frame, 16: guide cylinder, 17: pipe cylinder, 20: weight, 26: bracket, 26a: recess, 28: Bracket, 30: rod (locking part), 34: shackle (hanging part), 35:
rod

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66C 23/74 B66C 23/76

Claims (1)

(57) [Claims] 1. Mobile construction with crawler-type undercarriage
In the machine, outer surfaces of left and right side frames constituting the lower traveling body
Between the outward projections of theWeight mounting bracket
Provided, The weight mounting bracket above the weight
Attach the weight mounting bracket to the location corresponding to
A recess that can be accommodated, and the weight is provided in the recess.
A locking portion for locking to the mounting bracket is provided,
Weight when suspended by a rope on the outer surface of the weight
The side frame facing surface is provided with a hanging portion facing downward, Abutting against the lower outer surface of the weight against the side frame
And a bracket for inserting the rod.
Ke The weight is hung by connecting a rope to the hanging portion,
Connect the locking portion of the weight to the weight of the side frame.
Lower the rope by locking it to the bracket for mounting the light
As a result, it turns downward around the locking portion by its own weight.
Move the weight mounting bracket to the recess
The upper part is stored and fixed, and the rod is
And the lower outer surface is in contact with the rod and
Movement is prevented and the lower part is fixed Transfer characterized by that
Weight mounting structure for dynamic construction machinery.