JPH1036065A - Power shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power shovel which has a simple structure and is excellent in the overhanging and storage properties of its hook assembly by enabling the hook assembly to be entirely stored, and securing a sufficient clearance between a bucket and the hook assembly. SOLUTION: This power shovel includes a pair of spaced links 24, 24, each of which is connected to the end of a hydraulic cylinder 11a at one end and rotatably connected via a mounting pin 25 to the back of a bucket 2 at the other, and a hook assembly 20 that can be stored between the links, the hook assembly comprising an overhanging element, which can rotate about the mounting pin between a position between the links and an overhanging position in front of the links, and which has a pair of spaced side plate parts just wide enough so that they can be stored between the links, and an articulated assembly main body 59 which has one end rotatably connected to the end of the overhanging element, has a hook 52 at the other end, and can be folded and stored between the side plate parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power shovel having a hook assembly for crane operation.

[0002]

2. Description of the Related Art In civil engineering work, when both excavation work and crane work are performed, two types of construction machines, a power shovel and a crane, are generally used. However, it is very complicated to use two types of construction machines properly, especially in small-scale construction, and there is a lack in rational aspects. Considering that the excavator itself has undulating power, without using a crane machine,
It goes without saying that performing a simple crane operation using a power shovel is beneficial in terms of improving the efficiency of civil engineering work. For this reason, at present, various methods capable of performing a simple crane operation by a power shovel have been devised and put into practical use.

FIGS. 8 to 12 show a conventional example of a power shovel having a hook assembly, which can perform a crane operation by itself. As is well known, the power shovel shown in FIG. 8 includes a bucket 103 rotatably attached to the tip of an arm 100 via a mounting pin 109, and a hydraulic cylinder 101 for tilting the bucket 103. 1
The configuration is such that the tip of the rod 101a of the No. 01 and the bracket 104 of the bucket 103 are connected by a link (hereinafter referred to as a tapping link) 102. A mounting pin (hereinafter, referred to as a bucket pin) 10 for connecting the tapping link 102 and the bracket 104 is provided.
5, a hook assembly 106A having a hook 107 at the lower end is attached.

[0004] The excavator shown in FIG.
Another bracket 110 is provided by welding on the back surface of the bucket 103, and a hook assembly 106B having a hook 107 attached to the lower end of a chain or a wire is connected to the bracket 110.

In the power shovel shown in FIG. 10, a hook assembly 106C is connected to a mounting pin 109 for connecting the bucket 103 and the arm 100, and as shown in FIG.
C can be stored and held on the lower surface side of the arm 100.

A power shovel (Japanese Utility Model Laid-Open No. 2-106050) shown in FIG. 11 connects a hook assembly 106D composed of a multi-jointed link body to a bucket pin 105 so as to be rotatable and tapping. Forming a recess having a bottom surface at the center of the link 102,
During excavation work, the hook assembly 10
6D is folded up and down for storage. Note that the hook assembly 106D in the recess is provided.
Is held by the urging force of a spring (not shown).

A power shovel (Japanese Utility Model Publication No. 7-38308) shown in FIG.
A jib 120 including a support link 21 and a support link 122 is rotatably connected to a bracket 123 fixed to the tapping link 102, so that the support arm 121 protrudes forward and projects, and a hook assembly is attached to the tip of the support arm 121. By connecting 106E,
A certain clearance C is ensured between the bucket 103 and the hook assembly 106E. During excavation work, the hook assembly 106E is detached from the support arm 121, and the support arm 12
1 and the support link 122 are stored as shown by a two-dot chain line in FIG.

[0008]

8 and 9, the hook assemblies 106A and 106B hinder the excavation work using the bucket 103, so that the hook assemblies 106A and 106B are disturbed.
Must be removed, and the attaching and detaching work is troublesome. Further, since the hook assemblies 106A and 106B are in contact with the bucket 103, that is, the clearance between the hook assemblies 106A and 106B and the bucket 103 is not secured, the hook assemblies 106A and 106B are 103 may be damaged by contact.

On the other hand, in the example of FIG. 10, since the hook assembly 106C can be stored when not in use, it is not necessary to attach and detach the hook assembly 106C. However, when the hook assembly 106C is
As shown in FIG. 10B, during the excavation work, there is a possibility that the hook assembly 106C is pressed and damaged by earth and sand, rocks and the like on the bucket 103 during the excavation work. Further, as shown in FIG. 10A, since the crane work is performed in a state where the bucket 103 is turned upside down, it is difficult to hang the bucket 103 near the obstacle wall W.

The drawback of the configuration of FIG. 10 is that the hook assembly 106D
Is almost solved by the configuration of FIG. However, in the configuration of FIG. 11, a clearance cannot be secured between the bucket 103 and the hook assembly 106D. Further, since the hook assembly 106D is folded up and down and housed in the concave portion of the tapping link 102, the entire length of the hook assembly 106D is long, so that when the number of times of folding is increased, the hook assembly 106D is There is a possibility that the projection protrudes significantly above the ping link 102, which may hinder the digging operation. This is because the storage space is limited in the lower direction by the bottom surface of the concave portion. As described above, the method of storing the hook assembly 106D in the recess by folding the hook assembly 106D up and down is based on the space in the width direction (left and right direction) of the recess and the tapping link 1 closed by the bottom surface of the recess.
Since the space below 02 cannot be effectively used as a storage space, there is a problem in terms of storage of the hook assembly 106D.

Further, in the configuration of FIG. 11, the biasing force of the spring is used to hold the housed state of the hook assembly 106D in the recess. However, it is difficult to reliably hold the hook assembly 106D only by the biasing force of the spring, particularly under a severe impact force during excavation work.

On the other hand, in the configuration of FIG. 12, a clearance can be secured between the bucket 103 and the hook assembly 106D, but the hook assembly 106E must be removed during excavation work. In addition, since the support link 122 restricts the rotation of the support arm 121 and sets the extended state of the support arm 121 (jib 120), the structure of the jib 120 is complicated.

In the configuration shown in FIG. 12, the support arm 121 is pivoted about a fulcrum located on the side of the tipping link 102 with respect to the bucket pin 105. There is a limit to increasing. If the length of the support arm 121 is increased to protrude the support arm 121 greatly forward, the bending moment acting on the support arm 121 increases, which is not preferable.

The present invention has been made in view of the above circumstances, and an object of the present invention is to store all of the hook assembly in a position where the hook assembly is not damaged so that the attachment / detachment work of the hook assembly becomes unnecessary. Provided is a power shovel that can secure a sufficient clearance between a bucket and a hook assembly during a crane operation so that a work radius can be sufficiently increased, and that has a simple structure, and is excellent in overhangability and storage of the hook assembly. It is in.

[0015]

In order to solve the above-mentioned problems, a power shovel of the present invention is opposed to a bucket rotatably attached to the tip of an up-and-down arm at a predetermined distance from each other. A pair of links, one end of which is connected to the tip of a hydraulic cylinder that tilts the bucket, and the other end of which is rotatably connected to the back surface of the bucket via a mounting pin, and can be stored between the pair of links. A hook assembly that is rotatable about the mounting pin between a position between the links and a protruding position in front of the link and has a width that can be stored between the links. An overhanging body having a pair of side plate portions spaced apart from each other, one end of which is rotatably connected to a tip of the overhanging body, and a hook at the other end; Consisting of assembly body of folded and retractable articulated structure between.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a power shovel (hydraulic shovel) 1 that performs excavation work using a bucket 12. As shown, the excavator 1
Includes a carriage 4 and a revolving unit 3 rotatably mounted on the upper part of the carriage 4.

A boom 8 that can be raised and lowered by a boom cylinder 7 is attached to the revolving unit 3, and an arm 10 that is rotatable by an arm cylinder 9 is attached to the tip of the boom 8. A bucket 12 (specifically, a first end of a pair of brackets 27, 27 provided on the bucket 12) is provided at the tip of the arm 10 so as to be tiltable by a tilt cylinder (hereinafter, referred to as a bucket cylinder) 11.
Are rotatably mounted via mounting pins 26. The revolving unit 3 is provided with an operation room 2 for operating the work unit 20 including the boom 8, the arm 10, and the bucket 12, running the cart 4, rotating the revolving unit 3, and the like. I have.

The bucket 12 is tilted by operating the link mechanism 30 by expanding and contracting the cylinder rod 11a of the bucket cylinder 11. The link mechanism 30
A pair of first links 2 whose first ends are rotatably mounted to the distal end of the arm 10 via mounting pins 21.
2, 22 and a pair of second links (hereinafter, referred to as tapping links) whose first ends are rotatably attached to the second ends of the pair of brackets 27, 27 of the bucket 12. 24, 24 and the first link 2
The second ends of the rods 2 and 22, the second ends of the tapping links 24 and 24, and the distal end of the cylinder rod 11 a are rotatably connected by mounting pins 23. Details of this connection configuration are shown in FIG. FIG.
FIG. 4 is a sectional view taken along line AA of FIG. 1 (and FIG. 3). As shown in the drawing, boss portions 24a, 24a, which are the second ends of the tapping links 24, 24, are positioned adjacent to both sides of the tip of the cylinder rod 11a, and these portions are sandwiched from both sides. First link 2
With the second ends of the first and second links 22 and 22 positioned, the second ends of the first links 22 and 22 and the tapping links 24 and 2 are located.
The mounting pin 23 penetrates through the boss portions 24a, 24a of the No. 4 and the tip of the cylinder rod 11a.

On the other hand, the first of the tapping links 24, 24
The bosses 24b, 24b, which are the ends of the bosses 24b, 24b, are spaced apart from each other by a predetermined distance by a spacer 29 for maintaining the parallel state of the tapping links 24, 24 so that the bosses 24b, 24b are sandwiched from both sides. In a state where the brackets 27 of the bucket 12 are positioned, the mounting pins (hereinafter, referred to as bucket pins) 25 pass through the brackets 27, 27, the boss portions 24b, 24b, and the spacer 29. That is, the first ends of the tapping links 24, 24 and the second ends of the brackets 27, 27
Is rotatably connected to the end portion by a mounting pin 25,
Further, the spacer 29 is held rotatably by the mounting pin 25.

Between the pair of tapping links 24, a hook assembly 40 for performing a crane operation of lifting a load by a hook 52 is stored in a folded state. FIG. 1 does not show the hook assembly 40 for simplicity.

FIG. 2 shows a state in which the hook assembly 40 is extended from the stepping links 24, 24 and is deployed. As shown in FIG.
0 is a pair of jibs (side plate portions) in the shape of a "ku".
An overhanging body composed of 41 and 41 and a hook assembly main body 59 are provided.

As shown in FIG. 4, each jib 41, 41
The base ends thereof are welded to both ends of the spacer 29 (see FIG. 4), and can be rotated together with the spacer 29 about the bucket pin 25. Also,
Jib 41, 41, these are the tapping link 2
Hook assembly body 5 that can be stored between 4, 24 and
9 are separated from each other by a distance that can be stored between the jib 41, 41.

As shown in FIGS. 2 and 7, each jib 4
A first lock pin 80 to be described later
(See FIG. 4). In addition, a through hole 7 through which a second lock pin 81 (see FIG. 4) to be described later can penetrate is provided on the base end side of each jib 41.
2 are provided. Each tapping link 24,
24, the jib 41, 41 is stored between the tapping links 24, 24, as described later.
In a portion facing the through hole 71 in a state facing the 24,
A through-hole 87 through which the first lock pin 80 can pass is provided.

At the base end of each jib 41, 41, a claw 73 is provided at a position where it comes into contact with a stopper 74 provided on the boss 24b, which is the first end of the tapping link 24. . When the jib 41 is pivoted about the bucket pin 25 to protrude, the claw 73
4, the jib 41 restricts further rotation of the jib 41.

As shown in FIG. 2, the hook assembly main body 59 is a support having a hook 52 at the lower part of a multi-jointed link comprising a plurality of connecting members 42, 44, 48 and a rigid long rod 47. The jib 41 is suspended from the other end of each jib 41 in the deployed state. The first connecting member 42 constituting the hook assembly main body 59 is rotatably connected to the other ends of the gibs 41, 41 via mounting pins 53. Specifically, the first connecting member 42 is connected to each jib 4
It is rotatably held by the mounting pin 53 in a state located between the other ends of the first and the first 41. A pair of parallel brackets 42a, 42a are provided at the lower end of the first connecting member 42, and a second connecting member 44 is rotatably held between the brackets 42a, 42a by the mounting pin 43. Have been. Further, the second connecting member 44 has a pair of fixed members 45, 45 extending at a lower end thereof in a direction perpendicular to the pair of brackets 42a, 42a, and these fixed members 45, 45 are provided. The upper end of the long rod 47 is rotatably held by the mounting pin 46 therebetween. That is, in such a connection state, the mounting pins 4 connecting the first connection member 42 and the second connection member 44 are connected.
3 is connected to the second connecting member 44.
It is perpendicular to the direction of penetration (the direction of attachment) of the attachment pin 46 connecting the rod and the long rod 47. That is, the rotation direction of the second connection member 44 with respect to the first connection member 42 is perpendicular to the rotation direction of the long rod 47 with respect to the second connection member 42. Accordingly, a universal joint that can freely rotate the long rod 47 around two axes perpendicular to each other is formed by this connection state.

A pair of third connecting members 48 and 48 are rotatably connected to the lower end of the long rod 47 by mounting pins 49 so as to sandwich the long rod 47. Each connecting member 48, 48 has a connecting member 4 along with the jib 41, 41 between the tapping links 24, 24, as described later.
8 and 48, and the connecting members 48 and 48 are
A through-hole 50 through which the second lock pin 81 can pass is provided in a portion facing the through-hole 72 in a state of facing the first lock pin 81.

At the lower ends of the third connecting members 48, 48, a pair of brackets 51a, 51a provided on the upper end of a support body 51 having a hook 52 are rotatably mounted via mounting pins 52. Are linked.

Next, the operation of the above configuration will be described.
When the hook assembly 40 is stored between the tapping links 24, 24 from the extended state shown in FIG. 2, for example, the connecting members 42, 44, the long rod 47, the third connecting bodies 48, 48, and the support body 51 Are pivoted about their corresponding mounting pins 46, 49, 52, 53 to fold the hook 52 and its support 51 together with the jib 41,
Position between 41. And in this state, jib 41,
41 is pivoted rearward about the bucket pin 25 to be positioned in the space between the tapping links 24, 24.
This state is shown in FIG. 3 and FIG. FIG. 5 is a sectional view taken along line BB of FIG. 4, and FIG. 6 is a sectional view taken along line CC of FIG.

In this stored state, the jib 41, 41
As shown in FIG. 4, the tapping links 24, 24 are positioned close to and parallel to the tapping links 24, 24.
It is stored in the space between them. The first and second connecting members 42, 44 extend upward from the jib 41, 41, and the long rod 47 is connected to the jib 41, 41.
And extend substantially in parallel. Further, the third connecting members 48, 48
Are hook supports 5 stored between the jib 41
It extends so as to rise upward from 1. That is,
The hook 52 and its support 51 are connected to the connecting members 42 and 4.
The jib 41 is accommodated between the jib 41 and 41 in such a state that the jib 41 and 41 are held by the long rod 47. An assembly 40 is stored between the tapping links 24,24.

Such a stored state corresponds to two lock pins 8
0,81. That is, in the stored state, the tapping links 24, 24 and the jibs 41, 41 face each other, and the through-hole 87 of the tapping links 24, 24 and the through-hole 71 of the jibs 41, 41 face substantially coaxially.
The jib 41, 41 and the third connecting member 48, 48 face each other, and the through hole 72 of the jib 41, 41 and the third connecting member 4
8, 48 are substantially coaxially opposed to the through holes 50. Accordingly, the first lock pin 80 is passed through the through hole 87 and the through hole 71 to fix the jibs 41, 41 to the stepping links 24, 24, and as shown in FIG. The first lock pin 80 is hooked on the first lock pin 80, and the second lock pin 81 is inserted into the through hole 72 and the through hole 50.
Through the third connecting member 4 with respect to the jibs 41, 41.
When the hooks 8 and 48 are fixed, the stored state of the hook assembly 40 between the tapping links 24 and 24 is maintained.

When the hook assembly 40 is extended forward from the stored state and unfolded, the two lock pins 80 and 81 are pulled out and the operation reverse to the above-described storage operation is performed. That is, first, the jibs 41, 41 are turned forward about the bucket pin 25 to protrude.
In this overhang operation, the claw portions 73 of the jib 41, 41 abut against stoppers 74, 74 provided on the boss portions 24 b, 24 b which are the first ends of the tapping links 24, 24, and the bucket pins 25, 41. Jib 4 centered on
The rotation of the hook assemblies 40 is restricted, and the extended state of the hook assembly 40 is set. After such positioning of the jib 41, the connecting members 42, 44 and the long rod 47
And the third connecting members 48, 48 and the support member 51 are pivoted about the corresponding mounting pins 46, 49, 52, 53, and then unfolded, the hook assembly main body 59 becomes the jib 4
The jib 41 hangs down from the other end of the jib 41 in a state where a sufficient clearance is secured between the jib 41 and the bucket 12 by the overhang of the bucket 1, thereby enabling the crane operation by the hook 52.

As described above, in the power shovel 1 of the present embodiment, the hook assembly 40 includes the jib 41 and the hook assembly main body 59, and the jib 41,
The hook assembly main body 59 is projected forward through 41. Therefore, when the hook assembly 40 is extended during the crane operation, the bucket 1
A certain clearance is secured between the hook assembly 2 and the hook assembly main body 59. As a result, the hook assembly main body 59 does not interfere with the bucket 12 and is not damaged during the crane operation, and the hanging operation in the vicinity of the front obstacle wall can be easily performed.

The power shovel 1 of the present embodiment is
Since the jib 41, 41 rotates about the bucket pin 24, the jib 41, 41 can be extended without increasing the length of FIG.
The jib 41 can be made to protrude forward more than the conventional example shown in FIG. Therefore, a sufficient clearance can be secured between the bucket 12 and the hook assembly 40, and the working radius can be made sufficiently large.

In the power shovel 1 of the present embodiment, the boss portions 24b, 24 of the tapping links 24, 24 are provided.
The pawls 73, 73 of the jib 41, 41 abut against stoppers 74, 74 provided on the b, the rotation of the jib 41, 41 about the bucket pin 25 is restricted, and the extended state of the hook assembly 40 is set. Is done. That is, the rotation of the jib 41 is automatically restricted by simply extending the jib 41, 41 without using a lock pin or the like. Therefore, the hook assembly 40 has excellent overhanging properties, and an additional mechanism (for example, the support link 12 shown in FIG.
Since 2) is also unnecessary, the structure of the jib 41 can be simplified.

The power shovel 1 of the present embodiment is
All of the hook assemblies 40 can be stored compactly in a position where the hook assemblies 40 are not easily damaged, that is, between the stepping links 24. That is,
The hook 52 and its support 51 are connected to the connecting members 42, 44,
48 and the long rod 47, and housed between the jib 41, 41. In this housed state, the jib 41,
41 can be pivoted rearward about the bucket pin 25 to be positioned in the space between the tapping links 24,24. Therefore, there is no need to remove the hook assembly 40 during excavation work, and the work efficiency can be improved.

In particular, in the storage method according to the present embodiment, the assembly main body 59 is housed between the pair of jibs 41, 41, and the jibs 41, 41 are separated from each other by the pair of separated tapping links 24, 41.
Since the so-called sandwich method of storing the space between the stepping links 24 is adopted, the space between the tapping links 24 and 24 is effectively used as a storage space, and the hook assembly 40 is used.
Can be stored compactly. That is, according to this storage method, the space between the tapping links 24, 24 can be effectively used in the up, down, left, and right directions by effectively utilizing the space below the tapping links 24, 24. Therefore, the hook assembly 40 can be efficiently stored in a mode that does not hinder the excavation work, as compared with the configuration in FIG. 11 in which the hook assembly is folded up and down and stored in the recess of the tapping link.

The holding state of the hook assembly 40 can be easily maintained by the two lock pins 80 and 81. Such holding by the two lock pins 80 and 81 is more reliable than holding by the biasing force of the spring as shown in FIG.

Further, in the power shovel 1 of the present embodiment, since the hook assembly main body 59 is formed by the rigid rod 47, it is easy to store the hook assembly 59 with less wear than the wire.

In this embodiment, the rod 47 is connected to the jib 41 via a universal joint so that the rod 47 has substantially the same degree of freedom as a flexible wire. Therefore, it is easy to follow the swing of the hook 52 in the front-rear and left-right directions.

In this embodiment, in the hook assembly main body 59, the support body 51 and the rod 47 are connected to the third body.
Are rotatably connected via the connecting members 48, 48. However, even if the support body 51 and the rod 47 are directly connected rotatably without using the third connecting members 48, 48. good.

The gibs 41 may be connected to each other by a connecting member. That is, for example, the cross-section of the overhanging body may be formed in a concave shape by connecting the jibs 41, 41, which are side plate portions, with the bottom plate portion, and the hook assembly main body 59 may be folded and stored in the concave space. .

[0042]

As described above, in the power shovel of the present invention, all of the hook assemblies can be stored in a position where they are not damaged so that the attachment and detachment work of the hook assemblies becomes unnecessary. And a sufficiently large working radius can be secured by securing a sufficient clearance between the hook assembly and the hook assembly.

[Brief description of the drawings]

FIG. 1 is an overall view of a power shovel according to an embodiment of the present invention.

FIG. 2A is an enlarged side view showing a protruding state of a hook assembly, and FIG. 2B is a front view of the hook assembly main body shown in FIG.

FIG. 3 is an enlarged side view showing a stored state of the hook assembly.

FIG. 4 is a sectional view taken along the line AA of FIGS. 1 and 3;

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

FIG. 6 is a sectional view taken along the line CC in FIG. 4;

FIG. 7 is a side view of a jib constituting the hook assembly of FIG. 2;

FIG. 8 is a view showing a first conventional example of a hook assembly attaching mechanism.

FIG. 9 is a view showing a second conventional example of an attachment mechanism of a hook assembly.

FIG. 10 is a view showing a third conventional example of an attachment mechanism of a hook assembly.

FIG. 11 is a diagram showing a fourth conventional example of a hook assembly mounting mechanism.

FIG. 12 is a view showing a fifth conventional example of a hook assembly mounting mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Power shovel 10 ... Arm 12 ... Bucket 11 ... Bucket cylinder 24 ... Tapping link 40 ... Hook assembly 41 ... Jib (extended body) 47 ... Long rod 52 ... Hook 59 ... Hook assembly main body

Claims (2)

[Claims] 1. A bucket rotatably attached to a tip of an arm which can be raised and lowered, and opposed to each other with a predetermined distance therebetween, one end of which is connected to the tip of a hydraulic cylinder for tilting the bucket and the other end thereof. A pair of links that are rotatably connected to the back surface of the bucket via mounting pins, and a hook assembly that can be stored between the pair of links, wherein the hook assembly is located between the links. A projecting body having a pair of side plates that are rotatable about the mounting pin and between the links and that are spaced apart from each other and face each other, and one end of the projecting body. And an assembly body having a multi-joint structure that is rotatably connected to the tip of the overhanging body, has a hook at the other end, and can be folded and stored between the side plates. Power shovel, characterized in that. 2. The overhanging body according to claim 1, wherein the overhanging body has a claw for abutting against a stopper provided on the link to restrict rotation of the overhanging body to the overhanging position. A power shovel according to item 1.