JPH0512369Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a power shovel that can also be used as a crane.

(Prior art) Conventional power shovels and cranes are usually configured as dedicated machines for each.In order for these to function as both a power shovel and a crane, for example, a Some cranes can be used for crane work by removing the bucket from the end of the arm and suspending a hook or hook block in place of the bucket.

In addition, the specification and drawings originally attached to the patent application No. 148268/1983 (see Japanese Patent Application Laid-open No. 7427/1983), which was filed before this application, also include It is installed so that it can swing up and down,
A second boom is connected to the tip of the roughly letter-shaped first boom so as to be able to swing up and down, and a bucket is attached to the tip of the second boom so as to be able to swing freely. A pair of hydraulic cylinders connecting the side surfaces of the first boom and the rear end side of the second boom are provided on both sides of the upper part of the boom, and a pair of hydraulic cylinders is provided at the center of the upper part of the first boom between the pair of hydraulic cylinders. This document describes an excavator with a crane provided with a crane mechanism that extends and contracts in the length direction of the first boom.

Furthermore, in the specification and drawings originally attached to the application for Japanese Patent Application No. 110326/1983 (see Japanese Patent Application Laid-open No. 268432/1983), which was filed before this application, there are The first boom, which is swingable up and down and has a roughly letter shape, has a second boom at its tip.
A boom is rotatably provided, and a bucket is swingably connected to the tip of the second boom, and the first
This document describes an excavator with a crane in which a telescopic crane mechanism is provided in the length direction of the upper side surface of the boom that is bent into a dogleg shape.

(Problems to be solved by the invention) However, as mentioned above, in the case of conventional power shovels configured as special machines for excavating soil, etc. using a bucket, although the function of excavating soil, etc. can be expected to be sufficient, it is usually In the case of this type of power shovel, especially a small power shovel used on narrow roads, etc., in addition to the original excavation work, heavy objects such as manholes, water pipes, gas pipes, etc. to be buried in the excavation area are In order to lift heavy objects such as manholes, water pipes, gas pipes, etc. that have been previously buried in the same area, first remove the bucket from the end of the arm of the power shovel, and then It is necessary to attach a hanging device such as a hook or a hook block to the bucket for suspending objects such as manholes and water pipes, and then switch to a crane.Also, after cargo handling work, the above-mentioned hanging device must be removed and the bucket must be reinstalled. There was a problem in that it was difficult to put it on and put it back on the power shovel, and this replacement was time-consuming and troublesome.

However, the above-mentioned Japanese Patent Application No. 148268/1983 and Japanese Patent Application No.
The specification and drawings of No. 61-110326 describe an excavator with a crane that has both a crane function and an excavation function like a power shovel,
Therefore, the configuration of the crane-equipped excavator itself has been disclosed.

However, in the case of these crane-equipped excavators, the cover part that houses the crane mechanism that has an extendable boom has no direct relationship with the second boom (the arm corresponds to this in the present invention). As can be understood from the fact that the second boom is provided separately from the second boom on the top or side of the dogleg-shaped first boom, the second boom and the crane mechanism are connected to each other. Since they are installed as separate parts in different positions, the structure of this part becomes more complex and the volume of these parts becomes larger. I was afraid that I could not answer fully.

This invention was developed in view of the problems in the conventional examples, and also the problems of making it as compact as possible, which have not yet been solved by the inventions described in the specifications or drawings of the above-mentioned two patent applications. This design was developed with a focus on the power shovel's boom, and inside the cylindrical arm that is pivoted to the boom of the power shovel, a cargo handling means is provided at the end and an extendable inner cylinder is installed. By storing the inner cylinder in the arm when not in use, and placing the cargo handling means outside the rotation path of the bucket,
By placing the bucket and the inner cylinder with cargo handling means in alternate positions without removing either from the cylindrical arm, their respective functions can be performed alternately. It is an object of the present invention to provide a power shovel which can be used both as a crane and which has a simplified and compact structure for mounting parts such as an inner cylinder, and has excellent operability.

(Means for solving the problem) In order to solve the problems of the conventional example as described above, this invention has a cylindrical arm that is attached to the end of a boom that is movable on the swivel platform of the vehicle. Can be mounted on the shaft,
An arm cylinder is provided between the cylindrical arm and the arm, a bucket is rotatably attached to an end of the cylindrical arm, and the bucket cylinder is provided between the bucket and the cylindrical arm. provided, and
An inner cylinder having a cargo handling means at the end thereof is attached to the inside of the cylindrical arm so as to be able to extend and contract beyond the rotation locus of the bucket bag and to be able to be stored within the rotation locus of the bucket bag.

(Function) Since this device has the above-mentioned configuration,
When this power shovel that can be used as a crane is used as a power shovel, after storing the inner cylinder with a cargo handling means at the end inside the cylindrical arm, the bucket can be rotated by the bucket cylinder and by the arm cylinder. When performing excavation work by single or combined operation of swinging the arm and raising and lowering the boom, etc., and when used as a crane, the bucket can be extended and retracted into the cylindrical arm using a bucket cylinder. After the inner cylinder is moved out of the locus of expansion and contraction provided in the inner cylinder, the end of the inner cylinder is moved by the raising and lowering of the boom and/or the swinging of the cylindrical arm and the expansion and contraction of the inner cylinder beyond the rotational locus of the bucket. Crane work is carried out using the cargo handling means installed in the bucket, and when storing the crane/power shovel after the crane work and power shovel work are completed, the inner cylinder is placed inside the cylindrical arm inside the rotation locus of the bucket. After being stored, the bucket is rotated to the lower side of the end of the cylindrical arm by a bucket cylinder to make it compact.

(Example) Hereinafter, an example of the crane-cum-power shovel according to this invention will be described with reference to the drawings.

(First Embodiment) Figures 1 to 3 show a first embodiment of this invention, in which 1 is a vehicle, 2 is a vehicle running equipment,
3 is a swivel base, 4 is a driver's cab, 5 is a boom, 6 is a boom cylinder, 7 is an arm cylinder, 8 is a boom 5
The arm 8 has a cylindrical shape and has a shaft 10 attached to the end thereof via a bracket 9. 12 is arm 8
The side plates 13 are provided on both sides of the end of the side plate 12.
A pair of links 15 and 17 have one end attached to the bucket 13 and the side plate 12 with shafts 16 and 18, and the other end is attached to the end of the piston rod of the bucket cylinder 20 with a shaft 19, and 22 is the link mentioned above. A first inner cylinder provided in the arm 8, the inner cylinder 22 is a first inner cylinder provided in the arm 8.
A first inner cylinder, 2, which is expanded and contracted by an expansion and contraction means such as a hydraulic cylinder or a winch (not shown) provided therein;
Reference numeral 4 denotes a second inner cylinder provided inside the first inner cylinder 22, and the second inner cylinder 24 is expanded and contracted by the same expansion and contraction means as the first inner cylinder 22. 25 is a cover provided at the end of the second inner cylinder 24 and closes the opening of the end of the arm 8 (left side in FIG. 2) when the second inner cylinder 24 is contracted, 26 is a bracket, 27 is a hook, and 28 is a hanging bag. .

(Operation of the first embodiment) First, in order to use the crane-cum-power shovel of the first embodiment as a power shovel, the first inner cylinder 22 and the second inner cylinder are 24 is contracted and housed inside the cylindrical arm 8, and the end opening of the cylindrical arm 8 is closed by the cover 25 at the end of the second inner cylinder 24, resulting in the state shown in FIG.

After that, the boom 5 is rotated by the swivel base 3, the boom 5 is raised and lowered by the boom cylinder 6, the arm 8 is swung by the arm cylinder 7, and the bucket cylinder 20 rotates the bucket 13 around the shaft 14 via the links 15 and 17. Bucket 1 due to movement etc.
3, it performs soil excavation work similar to a normal power shovel.

Next, when using this crane power shovel as a crane, first move the bucket 13 located at the power shovel position indicated by the dotted line 13A in FIG. 2 by contracting the piston rod (not shown) of the bucket cylinder 20. 3, and ensure that state.

Thereafter, by directly or indirectly hooking the hanging bag 28 to the hook 27 hanging down from the end of the approximately L-shaped bracket 26 provided on the cover 25 at the end of the second inner cylinder 24, It performs cargo handling work similar to a normal crane.

At this time, the bent portion of the approximately L-shaped bracket 26 provided on the cover 25 at the end of the second inner tube 24 is slightly spaced downward from the lower end of the second inner tube 24 and protrudes toward the base side of the second inner tube 24 (the right side in FIG. 1). Therefore, when the second inner tube 24 and the first inner tube 22 are contracted into the cylindrical arm 8,
The upper side of the bent portion of the bracket 26 is smoothly retracted to the lower side of the end of the cylindrical arm 8 (see FIG. 2).

Note that the hook 27 may be attached directly to the outer side of the cover at the end of the second inner cylinder 24, but in this case, the hook 27 and The end of the second inner cylinder where the hook 27 is provided protrudes from the end of the cylindrical arm 8 to the left (see FIG. 2), so for example, the end of the cylindrical arm 8 the second
As shown in the figure, the bucket 13, which is attached to the shaft 14 at the top of the end side plate 12 of the cylindrical arm 8 that protrudes toward the upper left side, can be configured to have a shape that slopes downward to the right, so as to prevent the bucket 13 from rotating around the same shaft 14. It must be installed in a position where it will not be protected.

Further, as shown in FIGS. 1 to 3, the hook 27 is attached to the cover 25 and the bracket 26, which is approximately L-shaped, is located on the base side (as shown in the figure) from the end of the second inner cylinder 24. If the hook 27 is supported on the end projecting to the right side, the possibility of collision of soil, etc., scattered by the operation of the bucket 13 during power shovel work with the hook 27 is reduced accordingly.

Note that the first inner cylinder 22 provided in this cylindrical arm 8
may be omitted, and only the second inner cylinder 24 may be provided on the cylindrical arm 8, or conversely, the first inner cylinder 22 may be made into two stages, and the inner cylinder provided inside the cylindrical arm 8 may be A three-stage structure may be used, but in either case, the end of the L-shaped bracket 26 is spaced slightly downward from the outer periphery of the end of the inner cylinder 22 or the cylindrical arm 8 when the inner cylinder 22 is in the contracted state. configured to do so.

(Second Embodiment) Next, a second embodiment of the crane-cum-power shovel of this invention will be described with reference to FIGS. 4 and 5. Note that the first
The same names and symbols are used for parts common to the embodiments.

In this second embodiment, the boom 5 is raised and lowered by the boom cylinder 6, the cylindrical arm 8 swings and the bucket 13 is rotated by the arm cylinder 7 and the bucket cylinder 20, a hydraulic cylinder (not shown) inside the cylindrical arm 8, etc. This embodiment is similar to the first embodiment in that the first inner cylinder 22 and the second inner cylinder 24 are expanded and contracted with respect to the cylindrical arm 8 by the expansion and contraction means.

In this second embodiment, a winch assembly 31 is provided at the base of the cylindrical arm 8 (on the right side in FIG. 4), and a top sheave assembly 33 is provided at the cover 25 at the end of the second inner cylinder 24. Sheave assembly 3 through sheave 34 of sheave assembly 33
5 is suspended by a rope 32, the rope 32 is hoisted and lowered by a winch assembly 31, and cargo handling work is performed by a hook 37.

In addition, after retracting the first and second inner cylinders 22 and 24 into the cylindrical arm 20 and hooking the hook 37 of the hook assembly 35 onto the bracket 9 provided on the lower side of the cylindrical arm 8, the winch assembly is removed. After tensioning the wire 32 by 31, the boom cylinder 2
This is different from the first embodiment in that the power shovel operation is performed by rotating the bucket by looking at the links 15 and 17 and raising and lowering the cylindrical arm and boom 5 by the arm cylinder 7 and boom cylinder 6. It is almost the same as the example.

In addition, in FIGS. 3 and 4, 36 is a sheave of the hook-up seam 35.

(Effects of the invention) Since this invention has the above-mentioned configuration and functions, the following effects can be obtained.

(1) When the inner cylinder, which is inserted inside the cylindrical arm and has a cargo handling means at the end, is stored on the base side of the bucket, which is pivoted on the end of the cylindrical arm, the boom By performing the same functions as a normal power shovel, such as the undulation of the cylindrical arm, the swinging of the cylindrical arm, and the rotation of the bucket, the bucket can be rotated around the pivot point at the end of the cylindrical arm. By expanding and contracting the inner cylinder in a state where the inner cylinder is retracted out of the expansion/contraction locus, the cargo handling means at the end of the inner cylinder can perform cargo handling operations similar to those of a normal crane.

(2) Regardless of whether the power shovel or the crane is in working condition, the inner cylinder with cargo handling means or bucket can perform its respective functions by holding them in the required position without removing them from the cylindrical arm; Easy switching operation between power shovel and crane from one side to the other.
The switching operation can be performed quickly, and especially in a narrow place, the switching operation can be performed effortlessly and easily.

(3) A cylindrical arm that is pivoted to a boom that rises and falls on the swivel platform of the vehicle is provided with an extendable inner cylinder that is equipped with cargo handling means at the end, and when not in use, the bucket can be placed inside the cylindrical arm. This is because the inner cylinder is retracted out of the expansion and contraction path of the cylinder, and the inner cylinder is retracted into the cylindrical arm inside the rotation path of the bucket when the cargo handling device attached to the end is not in use. In addition to being able to easily operate the power shovel as a crane, when used as a power shovel, the inner cylinder is housed within the cylindrical arm, and the cargo handling means attached to the end of the inner cylinder is attached to the end of the cylindrical arm. The power shovel is retracted toward the base, making the whole compact, and there is nothing exposed outside the outer cylindrical arm of the cargo handling means, making it suitable for use in narrow places such as road ditch excavation where small turning operations are required. work efficiency is significantly improved.

(4) Since the inner cylinder with the cargo handling means is provided so that it can be stored in the cylindrical arm, it can be inserted into the cylindrical arm immediately by centering the cylindrical arm in the length direction with respect to the length direction of the boom. The inner cylinder, and by extension the crane section constituted by the inner cylinder, is immediately aligned in the longitudinal direction of the boom, and side plates are made to protrude obliquely outward and upward from both ends of the cylindrical arm. By rotatably pivoting the base of the bucket to the upper part of both side plates, it becomes easy to center the bucket and the cylindrical arm.
Assembling and manufacturing this crane-cum-power shovel becomes much easier.

(5) side plates protrude diagonally outward and upward from both ends of the cylindrical arm, the base of the bucket is rotatably attached to the tops of the side plates, and the base of the bucket is rotatably attached to the top of the side plates; The other ends of the pair of links whose ends are each pivoted to the side plate are pivoted to one end of a bucket cylinder, and the other end of the bucket cylinder is pivoted to the cylindrical arm.
Since the pivot point of the bucket to the cylindrical arm is located at a higher position than the cylindrical arm body, there is no fear that the inner cylinder accommodated in the cylindrical arm will be prevented from expanding or contracting.

(6) In addition, the degree of freedom in selecting the pivot point between the bucket and the side plate and the pivot point between the side plate and both links is increased,
Furthermore, the bucket is provided so that it projects diagonally outward and upward from the end of the cylindrical arm due to the short expansion and contraction stroke of the bucket cylinder.
The degree of freedom in designing the structure that allows for large rotation around the shaft attachment parts at the top of both side plates is increased, and the bucket cylinder does not need to be placed particularly close to the ground surface.
The bucket can be used for sufficient power shovel work, and the design of the bucket can be simplified since the causes of damage to the bucket cylinder due to contact with the ground surface are reduced.

(7) At the end of the innermost inner cylinder of the inner cylinder provided retractably on the cylindrical arm, the inner cylinder is slightly spaced downward from the end of the innermost inner cylinder, and the end thereof is the inner cylinder of the cylindrical arm. If a bracket is provided that protrudes toward the base side and a cargo handling means is provided at the end of the bracket, the bracket and cargo handling means provided at the end of the inner cylinder will collide with the end of the cylindrical arm when the inner cylinder contracts. In addition, the bracket and cargo handling means do not prevent the bucket from being used for shoveling, and when the end of the cylindrical arm of the bucket is rotated downward after the power shovel is finished, , the bracket, the cargo handling means, etc. are substantially stored in the bucket, and therefore, the crane-cum-power shovel can be made more compact when stored.

(8) Since a cover that closes the end opening of the cylindrical arm is provided at the end of the innermost inner cylinder that can be stored inside the cylindrical arm, during power shovel operation using this crane-cum-power shovel, By contracting the inner cylinder to the inside of the cylindrical arm, the opening at the end of the cylindrical arm is closed by the cover provided at the end of the innermost inner cylinder. Even if dirt or muddy water is scattered, there is no fear that it will enter the inside of the cylindrical arm through the end opening.

[Brief explanation of the drawing]

The drawings show an embodiment of the crane-cum-power shovel according to this invention. Figure 1 is a side view of the first embodiment in a crane state, and Figure 2 is a power shovel state with its inner cylinder contracted. Fig. 3 is an enlarged side view of the main part of the object in a crane state by rotating the bucket upwards, and Fig. 4 is an enlarged side view of the main part of the second embodiment of this invention in a crane state. FIG. 5 is an enlarged side view of the main parts of the second embodiment in a power shovel state. 1...Vehicle, 3...Swivel base, 5...Boom, 6
...Boom cylinder, 7...Arm cylinder, 8
... Cylindrical arm, 9 ... Bracket, 10,1
4, 16, 18, 19... shaft, 12, 26... bracket, 13... bucket, 15, 17... link, 20... bucket cylinder, 22... first
Inner cylinder, 24...Second inner cylinder, 25...Cover, 27
...Futsuku, 35...Futsuku Atsushi.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical arm is pivotably attached to the end of a boom that is movably provided on a swivel platform of a vehicle, and between the cylindrical arm and the boom. An arm cylinder is provided, a bucket is rotatably attached to the end of the cylindrical arm, a bucket cylinder is provided between the bucket and the cylindrical arm, and the bucket is provided inside the cylindrical arm. A power shovel that can also be used as a crane, characterized in that an inner cylinder having a cargo handling means at the end thereof is installed so as to be able to extend and contract beyond the rotation locus of the bucket and to be able to be stored within the rotation locus of the bucket. (2) side plates protrude diagonally outward and upward from both ends of the cylindrical arm, and the base of the bucket is rotatably attached to the tops of the side plates; The other ends of the pair of links whose ends are each pivoted to the side plate are pivoted to one end of a bucket cylinder, and the other end of the bucket cylinder is pivoted to the cylindrical arm. The crane-cum-power shovel according to claim (1). (3) A cover is provided at the end of the innermost inner cylinder extendably provided on the cylindrical arm to close the end opening of the cylindrical arm when the innermost inner cylinder is in the most contracted state. A crane-cum-power shovel according to claim 1 of the utility model registration claim, characterized in that: