JP2000143157A - Mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile crane capable of coping with various purposes. SOLUTION: In a crawler crane, a working attachment can be mounted in front of a revolving frame 2, the pin holes 4, 5, 6, 7 capable of replaceably engaging with the working attachment, are formed on a front edge part of the revolving frame 2 and a rear part of this front edge part and an upper part of the revolving frame 2, and the pin holes 9, 10 capable of removably engaging with an outrigger, are formed on a rear edge part of the revolving frame 2. Whereby the crane can cope with various purposes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled crane which can be used for multi-purpose work, and is particularly suitable for a crawler crane.

[0002]

2. Description of the Related Art Crawler cranes, which are a type of self-propelled cranes, have advantages such as excellent stability and good running performance on uneven terrain and soft terrain. For this reason, as a crawler crane, for example, 3
Various special-purpose machines incorporating work attachments such as point type, folding leader, and standard crane are used.

FIG. 9 shows a crawler crane 5 having a hoisting device and a traveling device for lifting a squealing device.
FIG. 1 shows an example of a three-point system incorporating a reader attachment 52 that regulates the driving direction so that the pile can be accurately driven at a predetermined angle. Here, the lower part of the leader 54 having the front outrigger 53 is connected to a base machine 55 which is a crane main body, and the upper part of the leader 54 is supported by two stays 56 connected to the rear left and right of the base machine. . Further, the base machine 55 includes a rear outrigger 57 for supporting the stay 56. In addition, a hydraulic pressure source for operating the reader is provided, and the reader 54 can adjust the inclination angle in the left, right, front and rear directions. further,
With a two-sided reader that can rotate, it is possible to easily switch between excavation and driving operations.

FIG. 10 shows an example in which a folding reader is incorporated. In this case, a lower portion of the reader 58 is connected to a base machine 55 and two upper and lower portions at the front of the base machine. FIG. 11 shows an example in which a standard crane is incorporated. Here, the lower part of the boom 59 is attached to the base machine 55 so as to be swingable in the front-rear direction.

[0005]

In the above-mentioned conventional configuration, since each of them is a dedicated machine, a dedicated design according to the work purpose is provided, and it is not possible to cope with other models. For example,
In the three-point dedicated machine shown in FIG.
Is permanently installed in the base machine 55, and cannot be replaced with another model. In this case, a special counterweight shape is required to prevent interference between the rear outrigger 57 and the counterweight 60 for preventing overturning. Had occurred.

[0006] Further, in the dedicated machine of the folding reader shown in FIG.
Since a large supporting force is required at the mounting positions P1 and P2 of FIG. 8, the span between the mounting positions P1 and P2 becomes large, and the height of the base machine 55 becomes large, so that a reduction in the size of the apparatus cannot be expected. Furthermore, there has been a problem that the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional structure, and provides a self-propelled crane which can be used for a variety of purposes and which can achieve compactness and cost reduction. It is intended to do so.

[0008]

According to a first aspect of the present invention, there is provided a self-propelled crane to which a work attachment can be attached in front of a turning frame.
A self-propelled crane is characterized in that engaging parts are provided on the upper part of the revolving frame near the front end so that the working attachment can be exchangeably engaged.

According to such a configuration, the front end of the revolving frame and the upper portion of the revolving frame near the front end are provided with:
Since the work attachments can be exchangeably engaged with the provided engagement portions, various work attachments can be easily incorporated into the crane body. As a result, it is possible to obtain a self-propelled crane that can be used for various purposes.

In this configuration, when the work attachment is supported by using the engaging portion of the turning frame together with the engaging portion of the turning frame front end (in this case, it is preferable to use an adapter). ), Because the span between the support parts of the work attachment can be large,
There is no need to worry about an increase in the vertical dimension of the revolving frame as in a conventional dedicated machine, and the revolving frame can be reduced in size and the cost can be reduced.

According to a second aspect of the present invention, there is provided a self-propelled crane to which a work attachment can be attached in front of a swivel frame, wherein a work outrigger is detachably engageable with a rear end of the swivel frame. Is provided as a self-propelled crane.

According to this configuration, the working outrigger can be detachably engaged with the engaging portion provided at the rear end of the turning frame, so that the crane body requires the working outrigger. It can only be easily incorporated at times. As a result, it is possible to obtain a self-propelled crane that can be used for various purposes.

The third invention is a combination of the first and second inventions. Therefore, according to the structure of the third invention, a synergistic effect can be obtained.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention.

1 and 2 are a top view and a side view showing a detailed structure of a revolving frame of a crawler crane (hereinafter, simply referred to as a "crawler crane"), which is a kind of a self-propelled crane according to the present embodiment. , FIGS. 3 and 4 are a top view and a side view showing the entire configuration of the crawler crane. Figure 3,
As shown in FIG. 4, the crawler crane 1 is the same as the conventional example in that a work attachment 3 can be attached to the front of the turning frame 2. However, in the present crawler crane 1, as shown in FIGS. 1 and 2, the work attachment 3 can be interchangeably engaged with the front end of the turning frame 2, behind the front end, and above the turning frame 2. It differs from the conventional example in that the respective pin holes (corresponding to the engaging portions) 4, 5, 6, and 7 are provided. Further, the second embodiment differs from the conventional example in that pin holes (corresponding to engagement portions) 9 and 10 are provided at the rear end of the revolving frame 2 so that the work outrigger 8 can be detachably engaged. Hereinafter, examples in which various work attachments are incorporated in the crawler crane 1 will be described.

FIG. 5 shows an example in which a three-point work attachment is incorporated. 3 to 5, in the crawler crane 1, a rigid turning frame 2 is rotatably mounted on a traveling body 12 provided with traveling crawlers 11 on the left and right. A lower part of a three-point reader 13 which is an example of the work attachment 3 is connected to a front end of the turning frame 2. On the rear frame, the main winding drum 14, the auxiliary winding drum 15, and the boom raising / lowering drum 16 are arranged in a row, and wind the respective work ropes.

Here, as shown in FIGS. 1 and 2, the revolving frame 2 has a box structure based on the side left and right vertical plates 2a, thereby having sufficient rigidity. Two pin holes 4 and 5 are provided vertically at the front end of the left and right vertical plate 2a, and a stay 17 extending from the lower portion of the reader 13 is connected by the pin holes 5 among them. Also, two pin holes 6 and 7 are provided side by side at the front of the side left and right vertical plate 2a and above the side left and right vertical plate 2a, and a stay 18 branched from the stay 17 is provided.
Are attached to these pin holes 6 and 7 via an adapter 19. The adapter 19 is formed, for example, in the shape of a triangular plate, and its lower part is engaged with the pin holes 6 and 7 and its upper part is engaged with the stay 18. That is, in the present embodiment, the distance between each of the engagement portions of the stays 17 and 18 with the turning frame 2 can be made as long as possible, so that the span between the pin holes 4 and 5 at the front end of the turning frame 2 can be reduced. Sufficient support force can be obtained even if it is not large. Conversely, the span between the pin holes 4 and 5 at the front end of the revolving frame 2 can be suppressed to reduce the size of the revolving frame 2. The adapter 19 has pin holes 6, 7
It is used only at the time of use.

At the rear of the boom raising / lowering drum 16, that is, at the rear end of the revolving frame 2, a counterweight 20 for preventing overturning is originally mounted in a three-layer structure. An outrigger mounting member 21 as shown in FIGS. 6A to 6C is provided in place of the lower layer. FIG. 3A is a top view,
(B) is a rear view, and (c) is a partial sectional view taken along line II. Two stays 14 extending from the upper portion of the leader 13 are connected to the upper surface of the outrigger mounting member 21, respectively, and the leader 13 is vertically supported by the stays 14. Further, in order to support the stay 14, a working outrigger 8 is attached to the left and right overhanging portions of the outrigger attachment member 21 so as to be able to expand and contract. For this reason, two pin holes 9 and 10 are provided vertically at the rear end of the side left and right vertical plate 2a, and the working outrigger 8 is connected thereto. That is, the side left and right vertical plates 2
The bracket portion 21a of the outrigger mounting member 21 is fitted into the rear end of the bracket a, and the pin holes 9, 10 are engaged with the bracket portion 21a. The work outriggers 8 are attached to the left and right end surfaces of the outrigger attachment member 21, and the stays 14 are attached above the left and right both sides of the outrigger attachment member 21. Further, a counterweight 20 is mounted above the outrigger mounting member 21. In order to compensate for the weight loss of the counterweight due to the outrigger mounting member 21, hunting of iron chips or the like is filled in the outrigger mounting member 21. ing.

On the other hand, the turning frame 2 shown in FIGS.
An engine (not shown) is arranged on a frame extending leftward toward the front of the vehicle, and the engine drives a power plant also composed of a hydraulic pump and the like, which are also not shown, to supply pressure oil to each drum, turning device, and the like. At the same time, a driving force for traveling is also supplied. On the other hand, a driver's cab 22 is provided on a frame that protrudes rightward toward the front of the revolving frame 2, and allows an operator to perform various operations. As described above, the crawler crane 1 can easily cope with a three-point work attachment.

Next, the work attachment is changed from a three-point type to a folding type, for example. In this case, as shown in FIGS. 1, 2 and 7, the lower portion of the reader 22 is supported by the front outrigger 22a. Further, one end of the cylinder 23 is attached to the upper pin hole 4 at the front end of the left and right vertical plate 2 a, and the other end is attached to the stay 25. A stay 24 branched from the lower center of the reader 22 is attached to the lower pin hole 5 at the front end of the left and right vertical plate 2a. In addition, Reader 2
The stay 25 branched from the lower center of the center 2 is attached via the adapter 19 as described above to the pin holes 6 and 7 provided behind the front ends of the left and right vertical plates 2a.
In this case, since the rear outrigger is unnecessary, the upper and lower pin holes 9 and 10 at the rear ends of the side plates 2a are not used. As described above, the crawler crane 1 can easily cope with a folding-leader-type work attachment.

Next, the work attachment is replaced with, for example, one for a standard crane. In this case, as shown in FIGS. 1, 2 and 8, only the boom 26 is attached to the upper pin hole 4 at the front end of the left and right side vertical plate 2a. Therefore, in this case, the other pin holes 5, 6, 7, 9, 10 are not used. As described above, the crawler crane 1 can easily respond to the work attachment for the standard crane. Also,
As described above, it goes without saying that other various work attachments can be easily handled.

As described above, the front end of the revolving frame 2
Behind this front end, pin holes 4,
According to 5, 6, and 7, various work attachments can be easily incorporated into a base machine that is a crane body. Further, since the work outrigger 8 can be removably engaged with the pin holes 9 and 10 provided at the rear end of the turning frame 2, the work outrigger can be easily incorporated into the base machine only when necessary. be able to. As a result, a crawler crane that can be used for various purposes can be obtained.

In the above-described embodiment, the engaging portions of the revolving frame 2 with the various work attachments 3 are all pin holes for connecting pins. For example, a bolt hole may be used. In the above embodiment, the crawler crane is exemplified as the self-propelled crane, but it is needless to say that the present invention can be applied to other self-propelled cranes, for example, a wheel crane.

[0024]

As described above, according to the present invention,
Work attachments can be interchangeably engaged with the front end of the revolving frame and holes provided at the rear of the front end, so that various work attachments can be easily incorporated into the crane body. Further, since the working outrigger can be engaged with the hole provided at the rear end of the turning frame, the working outrigger can be easily incorporated into the crane body. As a result, a crawler crane that can be used for various purposes can be obtained. In addition, since it is possible to easily cope with a case where the span between the support portions of the work attachment is large, the size of the revolving frame can be reduced, which leads to cost reduction.

[Brief description of the drawings]

FIG. 1 is a top view showing a detailed structure of a turning frame of a crawler crane according to an embodiment of the present invention.

FIG. 2 is a side view showing a detailed structure of a turning frame of the crawler crane according to the embodiment of the present invention.

FIG. 3 is a top view showing the entire configuration of the crawler crane according to the embodiment of the present invention.

FIG. 4 is a side view showing the entire configuration of the crawler crane according to the embodiment of the present invention.

FIG. 5 is an overall configuration diagram showing an example in which a three-point work attachment is incorporated.

FIG. 6 is a detailed structural view of a working outrigger attachment member.

FIG. 7 is an overall configuration diagram showing an example in which a folding lead type work attachment is incorporated.

FIG. 8 is an overall configuration diagram showing an example in which a standard crane type work attachment is incorporated.

FIG. 9 is an overall configuration diagram showing an example in which a conventional three-point work attachment is incorporated.

FIG. 10 is an overall configuration diagram showing an example incorporating a conventional folding lead type work attachment.

FIG. 11 is an overall configuration diagram showing an example in which a conventional standard crane type work attachment is incorporated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crawler crane (a kind of self-propelled crane) 2 Revolving frame 3 Work attachment 4,5,6,7,9,10 Pin hole (corresponding to engagement part) 8 Work outrigger

Claims (5)

[Claims] 1. A self-propelled crane to which a work attachment can be attached in front of a turning frame, wherein a work attachment is freely replaceable between a front end of the turning frame and an upper portion of the turning frame near the front end. A self-propelled crane characterized in that it is provided with engageable engagement portions. 2. A self-propelled crane to which a work attachment can be attached in front of a turning frame, wherein an engaging portion capable of detachably engaging a working outrigger is provided at a rear end of the turning frame. A self-propelled crane characterized by the following. 3. A self-propelled crane to which a work attachment can be attached in front of a turning frame, wherein a work attachment is freely replaceable on a front end of the turning frame and an upper portion of the turning frame near the front end. A self-propelled crane characterized by comprising engaging portions that can be engaged with each other, and an engaging portion that is detachably engageable with a working outrigger is provided at a rear end of the turning frame. 4. An upper part near the front end of the revolving frame, wherein two holes are juxtaposed, and an adapter is provided in which the lower part can be engaged with the two holes and the upper part can be engaged with the work attachment. Item 5. A self-propelled crane according to item 1 or 3. 5. A part or all of engaging portions provided at a front end portion of the turning frame, an upper portion of the turning frame near the front end portion, and a rear end portion of the turning frame are holes for pin connection. Item 5. The self-propelled crane according to any one of Items 1 to 4.