JPH11193542A - Construction machinery front device, boom used therefor, and building method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change specifications of a front device corresponding to the contents of work within a short time and to enable the promotion of work efficiency thereof. SOLUTION: An excavation work sub-assembly 14 corresponding to the contents of work is connected to the front end side of a common boom 8 always mounted to a swing-frame 3 of an upper swing body 2 in a changeable manner. By the constitution, the change of specifications of a front device 7 corresponding to the contents of work can be made within a short time, and one hydraulic shovel can be used for different works such as excavation work, dismantlement work, etc. Since a positioning mechanism 22 is provided between the common boom 8 and a joint boom 16 of the excavation work sub-assembly 14, positioning between the common boom 8 and joint boom 16 can be easily made, and work efficiency can be promoted when the common boom 8 is connected to the excavation work sub-assembly 14 with a joint pin 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front apparatus for a construction machine suitably used for excavation work of earth and sand, demolition work of a building, and the like, a boom used therefor, and a method of assembling the same.

[0002]

2. Description of the Related Art In general, a construction machine such as a hydraulic shovel, which is suitably used for excavation work of soil and the like and demolition work of a building, includes an upper revolving structure as a construction machine body rotatably mounted on a lower traveling structure. And a front device provided on the upper swing body.

[0003] The front device includes a boom mounted on the upper swing body so as to be able to move upward and downward, and an arm, a working tool, etc., which is mounted on the distal end side of the boom so as to be able to move upward and downward.
A work implement such as a bucket is used when excavating work such as earth and sand, and a work implement such as a cutter is used when performing dismantling work of a building.

[0004] When a building is dismantled using a hydraulic excavator, it is necessary to perform a dismantling operation using a cutter or the like at a high place of the building, so that it is necessary to increase the length of the entire front device. There is.

[0005] Therefore, when one hydraulic excavator is used also for excavation work of earth and sand, demolition work of a building, and the like,
A method of preparing a front device to be applied during excavation work and a front device having a large length to be used for demolition work, and replacing the two types of front devices with the upper revolving structure according to the work content, and mounting the same. Can be

However, the upper revolving superstructure and the front device are:
Because the base end side of the boom that constitutes the front device is rotatably attached to the boom foot portion of the revolving frame that constitutes the upper revolving structure via a large-diameter connection pin,
The work when exchanging the front apparatus for excavation work and the front apparatus for dismantling work is very complicated. In particular, in the case of a hydraulic shovel equipped with a large cab, the gap between the boom foot portion of the revolving frame and the cab is narrow, so that sufficient working space cannot be secured, and the work of attaching and detaching the connecting pin in this gap is not possible. There is a problem that it is very difficult.

[0007] On the other hand, for example, Japanese Utility Model Laid-Open No. 1-28
Japanese Patent No. 452,452 discloses the use of a boom that can be split in the length direction and one or more relay booms interposed in the middle of the boom to determine the overall length of the front device. There has been proposed a hydraulic excavator that can be adjusted according to the pressure.

[0008]

However, in the above-mentioned hydraulic excavator according to the prior art, when the excavating work is diverted to the dismantling work, for example, the work of attaching the relay boom to the middle part of the boom and the excavation of the extremity of the arm are performed. It is necessary to perform a work of mounting a cutter for dismantling work or the like in place of the work bucket, and there is a problem that a great amount of work time is required for the mounting work.

Further, since the above-mentioned boom and the relay boom are detachably connected via connecting pins, when connecting the boom and the relay boom, the pin insertion hole provided on the boom side and the relay boom side are connected to each other. There is a problem that the work of aligning the provided pin insertion holes with each other is complicated, and the workability when connecting the boom and the relay boom is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and comprises a front device composed of a boom and a working device, and selectively connecting the working device to a tip end of the boom to improve the work content. It is an object of the present invention to provide a front apparatus for a construction machine, a boom used for the front apparatus, and a method of assembling the front apparatus, the specification being capable of performing a specification change in a short time.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is applied to a construction machine front device mounted on a construction machine main body so as to be able to move up and down.

A feature of the means adopted by the invention of claim 1 is that the front device has a boom whose base end side is attached to the construction machine main body so as to be able to move up and down, and a front end side of the boom according to work contents. And a work device selectively connected to the boom and the work device. Positioning means for positioning the front end side of the boom with respect to the work device when connecting the boom and the work device; And a connecting means for connecting the working device to the end of the boom in a state where the working device and the boom are aligned.

[0013] With this configuration, the front device can be assembled according to the work content such as excavation work and demolition work only by selectively connecting the work device to the tip end of the boom attached to the construction machine body. be able to. Further, the working device can be connected to the boom by the connecting device in a state where the working device and the tip end side of the boom are positioned by the positioning device.

According to a second aspect of the present invention, the positioning means includes an engaging projection provided on one end of the boom and one of the working devices and an engaging projection provided on the other member. When the boom and the working device are rotated relative to each other by rotating the boom and the working device in a state in which the engaging protrusion is engaged with the concave groove of the engaging portion, The connecting means is constituted by a contact portion that abuts, and the connecting means includes a pin hole formed in the tip end side of the boom and the working device, and a connecting pin that is inserted into each pin hole and integrally connects the working device to the boom. It consists of.

[0015] With this configuration, the engaging protrusion provided on the distal end side of the boom and one of the working devices can be engaged with the concave groove of the engaging portion provided on the other member side. When the engagement is performed and the boom and the working device are relatively rotated, the abutting portion abuts when the boom and the working device are positioned, and the relative rotation of the two stops. In this state, the working device can be connected to the front end of the boom by inserting the connecting pin into each of the pin holes formed in the front end of the boom and the working device.

According to a third aspect of the present invention, a connecting mechanism for detachably connecting the working device to the boom is provided between the boom and the working device, and the connecting mechanism may be any one of the boom and the working device. A mounting bracket provided on one of the members, a plurality of fixing pins provided on the other member, and fixing claws provided fixed to the mounting bracket and engaged with at least one of the fixing pins. And a movable claw rotatably supported by the mounting bracket and engaged with the other of the fixed pins.

With this configuration, the fixed claw provided on one of the boom and the working device is engaged with one of the plurality of fixed pins provided on the other member. By simply rotating the movable claw to engage the other of the fixing pins, the working device can be connected to the tip end of the boom.

Further, according to the present invention, a plurality of cylinder mounting bosses for selectively mounting the front end side of the boom cylinder are provided on the front end side of the boom, so that the boom cylinder can be extended or contracted at the maximum. In this configuration, the angle of the elevation of the boom is changed.

With this configuration, the boom cylinder can be selectively mounted on any one of the cylinder mounting bosses at the tip end of the boom cylinder. The elevation angle can be changed.

Further, the invention according to claim 5 is characterized in that the working device is provided with a joint boom on the base end side, and the working device is connected to the distal end side of the boom via the joint boom.

With this configuration, the working device can be connected to the distal end of the boom simply by connecting the connecting boom of the working device to the distal end of the boom.

The invention according to claim 6 comprises a box-shaped can-making structure, the base end of which is attached to the construction machine main body so as to be able to move up and down, and the working device is selectively provided at the front end according to the work content. In the boom used for the front device for the construction machine to be connected, a positioning device for performing positioning with the working device and the working device positioned by the positioning device are connected to the tip end side of the can making structure. And connection means for performing the connection.

With this configuration, when the working device is connected to the distal end of the boom attached to the construction machine main body, the working device and the distal end of the boom are positioned by the positioning means provided on the can-making structure. The working device can be connected by the connecting means in a state where the positions are aligned.

According to a seventh aspect of the present invention, there is provided a working device in which a base end is attached to a construction machine main body so as to be able to move up and down, and a working device selectively connected to a tip end of the boom in accordance with work contents. A method for assembling a front device for a construction machine, comprising: a positioning step of positioning a front end side of a boom with respect to a base end side of a working device; And a connecting step of connecting the end side.

By adopting such an assembling method, in the positioning step, the base end side of the working device is aligned with the distal end side of the boom attached to the construction machine main body, and in the connecting step, the distal end side of the boom is positioned. The front device can be assembled according to the work content such as excavation work and demolition work only by connecting the work device and the base end side of the work device.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a front apparatus for a construction machine according to the present invention applied to a hydraulic shovel will be described with reference to FIGS. 1 to 13.
First, FIGS. 1 to 8 show a first embodiment according to the present invention.

1 and 2, reference numeral 1 denotes a crawler-type lower traveling body, and reference numeral 2 denotes an upper revolving body as a construction machine main body which is mounted on the lower traveling body 1 so as to be pivotable. The upper revolving superstructure 2 is provided on the revolving frame 3, a cab 4 provided on the front left side of the revolving frame 3, and on the revolving frame 3 behind the cab 4, and includes a motor, a hydraulic pump, and the like. And a counterweight 6 mounted on the rear end side of the revolving frame 3 at the rear side of the machine room 5.

Reference numeral 7 denotes a front device provided at the front center of the upper revolving unit 2. The front device 7 has a common boom 8 attached to the front center of the revolving frame 3 so as to be able to move up and down. It comprises a sub-assembly 14 for excavation work described below, which is exchangeably connected to the tip end side of the boom 8.

Here, as shown in FIG. 3, the common boom 8 includes an upper plate 8A, a lower plate 8B, left and right side plates 8C, 8C.
And a base end side thereof is attached to a boom foot provided at the center of the front part of the revolving frame 3 by connecting pins (both not shown). The base end of the common boom 8 is always attached to the upper revolving superstructure 2, and the distal end of the common boom 8 is provided with not only a sub-assembly 14 for digging work but also a below- Work subassembly 31,
It is configured such that different types of working devices such as the disassembling work subassembly 41 and the like can be selectively connected.

Numeral 9 denotes a cylinder mounting boss provided on the distal end side of the common boom 8, and both axial ends of the cylinder mounting boss 9 protrude to the outside from the left and right side plates 8 C constituting the common boom 8. ing. And the boss 9 for mounting the cylinder
The ends of the rods 10A of the boom cylinders 10 (only one is shown) provided on both the left and right sides of the common boom 8 are pin-connected to both ends in the axial direction, and the tube 10B of the boom cylinder 10 is The base end is pin-connected to the turning frame 3. Therefore, the common boom 8 is configured to move up and down with respect to the turning frame 3 by extending and contracting the rod 10A of the boom cylinder 10.

Numeral 11 designates another cylinder mounting boss provided on the common boom 8 in the vicinity of the cylinder mounting boss 9. The cylinder mounting boss 11 is provided with a bracket or the like on the lower surface plate 8 B of the common boom 8. Is fixed through.

Here, each cylinder mounting boss 9, 11
As shown in FIG. 6, for example, is provided on the circumference of a radius R centered on the center 8D of elevation of the common boom 8.
By selectively pin-connecting the distal end of the rod 10A of the boom cylinder 10 to one of the cylinder mounting bosses 9 and 11, the common boom 8 can be raised and lowered when the boom cylinder 10 is fully extended or retracted. By changing the moving angle, for example, the working posture of the front device 7 when the boom cylinder 10 is fully extended is changed between the posture indicated by the solid line and the posture indicated by the two-dot chain line in FIG.

Reference numerals 12 and 12 denote left and right mounting brackets provided on the distal end side of the common boom 8, respectively. The mounting brackets 12 are fixed to the left and right side plates 8C of the common boom 8 by welding or the like. They face each other in the left and right directions.
Each of the mounting brackets 12 is provided with two pin insertion holes 13, 13 which are separated from each other upward and downward. On the outer surface of each mounting bracket 12, a latch plate 23 described later is fixedly located at an intermediate portion between the pin insertion holes 13, 13.

Reference numeral 14 denotes a connecting pin 1 on the tip side of the common boom 8.
5 shows a subassembly for excavation work as a working device detachably connected by 5, 5;
An arm 18 is mounted on the distal end side of the arm 6 so as to be able to move up and down, and is driven by an arm cylinder 17. A bucket 20 is rotatably mounted on the distal end side of the arm 18 and driven by a bucket cylinder 19. ing.

Here, as shown in FIG. 3, the joint boom 16 includes an upper surface plate 16A, a lower surface plate 16B, and left and right side plates 1A.
6C, 16C (only one is shown), a box-shaped can-made structure surrounded by an end plate 16D and the like, and a base end of each of the mounting brackets 12 provided on the tip end of the common boom 8. Two boss cylinders 21 and 21 having pin insertion holes 21A on the inner peripheral side at positions corresponding to the pin insertion holes 13.
Is fixed.

Then, the mounting bracket 1 of the common boom 8
By inserting the connecting pin 15 into each of the pin insertion holes 13 provided in the base 2 and the respective pin insertion holes 21A provided in the connection boom 16, the connection boom 1 of the subassembly 14 for excavation work is provided.
6 is connected to the distal end side of the common boom 8.

Reference numeral 22 is provided between the distal end side of the common boom 8 and the base end side of the joint boom 16, and aligns the pin insertion hole 13 on the common boom 8 side with the pin insertion hole 21A on the joint boom 16 side. 3 to 5, the positioning mechanism 22 includes a latch plate 23, a stopper 24, an engagement pin 25, and the like, which will be described later.

Reference numerals 23, 23 denote latch plates provided on the respective mounting brackets 12 of the common boom 8. Each latch plate 23 is made of a rectangular steel plate, and is located substantially in the middle of the pin insertion holes 13, 13. And is fixed to the outer surface of the mounting bracket 12 by welding or the like. A trapezoidal groove 23A with which the engaging pin 25 is engaged is formed on the projecting end side of the latch plate 23 projecting forward from the mounting bracket 12.

Reference numerals 24, 24 denote stoppers (only one is shown) fixed to the left and right side plates 16C of the joint boom 16 by welding or the like, and a lower end of the stopper 24 has a mounting bracket on the common boom 8 side. An abutment surface 24A is provided to abut against the abutment plate 12A provided on the base 12, and an abutment portion is formed by the abutment plate 12A of the mounting bracket 12 and the abutment surface 24A of the stopper 24.

Reference numerals 25, 25 denote engagement pins (only one is shown) fixed to the upper end side of the stopper 24.
The joint boom 1 is located at a position corresponding to the concave groove 23A of the latch plate 23 provided on each mounting bracket 12 of the common boom 8.
6 protrudes from the left and right side plates 16C.

When the base end of the joint boom 16 is connected to the distal end of the common boom 8, the concave groove 23A of the latch plate 23 provided on the common boom 8 side, as shown in FIG.
By raising the common boom 8 in a state where the engaging pins 25 are engaged with each other, the base end side of the joint boom 16 is slightly rotated with the engaging pin 25 as a fulcrum. Then, as shown in FIG. 4, when the pin insertion hole 13 on the common boom 8 side and the pin insertion hole 21A on the joint boom 16 side are positioned, the abutment surface 24A of the stopper 24 is provided on the common boom 8. Each mounting bracket 12 is configured to be in contact with the corresponding plate 12A.

The front apparatus 7 according to the present embodiment has the above-described configuration. Hereinafter, the operation of connecting the excavation sub-assembly 14 to the distal end side of the common boom 8 will be described.

First, as shown in FIG. 2, the lower traveling body 1 is run while the common boom 8 is held substantially horizontally, and the joint boom 16 of the excavating sub-assembly 14 placed on the ground in a folded state. The base end is inserted between the mounting brackets 12 provided on the distal end of the common boom 8.

At this time, as shown in FIG. 5, with the concave groove 23A of the latch plate 23 provided on the common boom 8 side engaged with each engagement pin 25 provided on the joint boom 16 side, The common boom 8 is slightly lifted by the boom cylinder 10. As a result, the joint boom 16 rotates slightly downward with each engagement pin 25 as a fulcrum, and the pin insertion hole 13 on the common boom 8 side and the pin insertion hole 21A on the joint boom 16 side are aligned concentrically. At this time, the abutment surface 24A of the stopper 24 provided on the joint boom 16 comes into contact with the abutment plate 12A of each mounting bracket 12 provided on the common boom 8, and the rotation of the joint boom 16 stops (positioning step).

Thus, the pin insertion hole 13 on the common boom 8 side and the pin insertion hole 21A on the joint boom 16 side can be easily aligned by the positioning mechanism 22, and in this state, the pin insertion hole 13 on the common boom 8 side is set. And joint boom 16
By inserting the connection pin 15 into the pin insertion hole 21A on the side, the excavation work subassembly 14 can be connected to the tip end side of the common boom 8 (connection step).

Here, when excavating the ground or the like using the excavating sub-assembly 14, the distal end side of the rod 10A of the boom cylinder 10 is pin-connected to the cylinder mounting boss 9, as shown in FIG. For example, when a building is dismantled or the like, as shown in FIG. 6, the distal end side of the rod 10A of the boom cylinder 10 is pin-connected to the cylinder mounting boss 11.

As a result, the undulation angle of the common boom 8 with respect to the ground when the rod 10A is fully extended changes, and the working posture when the subassembly 14 for digging work is erected, the rod 10A is attached to the boss 9 for cylinder mounting. The working posture shown by the two-dot chain line when the pins are connected is changed to the working posture shown by the solid line.

Therefore, when the rod 10A tip is pin-connected to the cylinder mounting boss 11, the bucket 20 is moved to a higher position than when the rod 10A tip is pin-connected to the cylinder mounting boss 9. The bucket 20 can be moved, and the workability when dismantling a building or the like using the bucket 20 can be improved. Conversely, when the rod 10A distal end is pin-connected to the cylinder mounting boss 9 in comparison with the case where the rod 10A distal end is pin-connected to the cylinder mounting boss 11, the bucket 20 is The bucket 20 can be moved to a lower position, and the ground can be deeply excavated using the bucket 20.

Next, FIG. 7 shows a hydraulic excavator of a trench excavation work specification. This hydraulic excavator is provided on the distal end side of the common boom 8 as a working device instead of the excavation sub-assembly 14 shown in FIG. The sub-assembly 31 for guttering work is connected.

In FIG. 7, reference numeral 31 denotes a sub-groove work sub-assembly fixed to the distal end side of the common boom 8 by the connecting pins 15, 15. The sub-groove work sub-assembly 31 is an upper boom 32 as a joint boom. When,
A lower boom 34, which is mounted on the distal end of the upper boom 32 so as to swing left and right, and is driven by an offset cylinder 33, and an arm connected body, which is mounted on the distal end of the lower boom 34 so as to swing left and right. 35, an arm 37 mounted on the distal end side of the arm connector 35 so as to be able to move up and down and driven by an arm cylinder 36, and a bucket mounted rotatably on the distal end side of the arm 37 and driven by a bucket cylinder 38 39 is roughly constituted.

Then, on the base end side of the upper boom 32,
Joint boom 1 of subassembly 14 for excavation work described above
Similarly to 6, a pin insertion hole (not shown) through which the connecting pin 15 is inserted is formed at a position corresponding to each pin insertion hole 13 of the common boom 8. On the base end side of the upper boom 32, a stopper 24, an engagement pin 25, and the like that constitute the positioning mechanism 22 together with a latch plate 23 provided on the distal end side of the common boom 8 are provided.

Therefore, when performing the trenching work, the trenching work subassembly 31 is connected to the distal end side of the common boom 8 by the connecting pins 15, similarly to the above-described drilling work subassembly 14. The excavator can be quickly changed to a specification suitable for guttering work. In addition, the work of connecting the common boom 8 and the sub-groove work subassembly 31 by the connection pin 15 can be performed in a short time by the positioning mechanism 22.

Next, FIG. 8 shows a hydraulic excavator of a dismantling work specification. This excavator is dismantled as a working device on the tip end side of the common boom 8 instead of the excavating work subassembly 14 shown in FIG. The work subassembly 41 is connected.

In FIG. 8, reference numeral 41 denotes a disassembly work subassembly connected to the distal end side of the common boom 8 by connecting pins 15, 15. The disassembly work subassembly 41 includes a joint boom 42 and a joint boom 42. An intermediate arm 44 mounted on the distal end of the intermediate arm 44 and driven by an intermediate arm cylinder 43; an arm 46 mounted on the distal end of the intermediate arm 44 and driven by an arm cylinder 45; A cutter 48 as a working tool, which is rotatably attached to the distal end side of the working tool 46 and is driven by a working tool cylinder 47, is roughly constituted.

At the base end side of the joint boom 42, the joint boom 16 of the above-described subassembly 14 for excavation work is provided.
Similarly to the above, a pin insertion hole (not shown) through which the connecting pin 15 is inserted is formed at a position corresponding to each pin insertion hole 13 of the common boom 8. In addition, a stopper 24 and an engaging pin 25 that constitute the positioning mechanism 22 together with a latch plate 23 provided on the distal end side of the common boom 8 are provided on the base end side of the joint boom 42.

Therefore, when the building is dismantled, similar to the excavation subassembly 14 described above,
By connecting the dismantling subassembly 41 to the distal end side of the common boom 8 by the connecting pins 15, 15, the hydraulic shovel can be quickly changed to a specification adapted to the dismantling work. In addition, the work of connecting the common boom 8 and the dismantling work subassembly 41 with the connecting pins 15 can be performed in a short time by the positioning mechanism 22.

Further, of the cylinder mounting bosses 9 and 11 provided on the common boom 8, the cylinder mounting boss 11
When the rod 10A distal end side of the boom cylinder 10 is pin-connected, the cutter 48 is higher when the rod 10A is fully extended than when the rod 10A distal end side is pin-connected to the cylinder mounting boss 9. It can be moved to a position, and dismantling work can be performed at a high position.

Thus, according to the present embodiment, the sub-assembly 14 for excavation work, the sub-assembly 31 for guttering work, and the sub-assembly for demolition work are provided on the distal end side of the common boom 8 always attached to the upper swing body 2. By selectively connecting the sub-assemblies 41 and the like corresponding to the work content, one hydraulic excavator can be used also for excavation work of earth and sand, excavation work of trenches, demolition work of buildings, and the like. .

FIGS. 9 to 12 show a second embodiment of the present invention. This embodiment is characterized in that a connecting mechanism 51 described later is provided between the common boom and the working device. And Note that, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals,
The description is omitted.

In the drawing, reference numeral 51 denotes a connecting mechanism provided between the common boom 8 and the joint boom 16 of the subassembly 14 for excavation work. The connecting mechanism 51 is provided on the distal end side of the common boom 8. Each mounting bracket 12, each fixing pin 53 described later, a fixing claw 54, and a moving claw 55 are configured.

Reference numerals 52, 52 denote left and right mounting brackets provided on the base end side of the connecting boom 16, respectively. The mounting brackets 52 are fixed to the left and right side plates 16C of the connecting boom 16 by welding or the like. , Left and right. Two fixing pins 53 are fixed between the mounting brackets 52 so as to be separated upward and downward.

Reference numeral 54 denotes the mounting bracket 1 on the common boom 8 side.
2 are fixed by connecting pins 15 and 15 and protrude toward the joint boom 16 side. On the protruding end side of the fixed claw 54, an arc groove 54A having a semicircular cross-sectional shape is opened downward. It is formed as follows. The arc groove 54 </ b> A of the fixing claw 54 is configured to engage with the lower fixing pin 53 of the fixing pins 53 provided on the joint boom 16 side.

Reference numeral 55 denotes a mounting bracket 1 on the common boom 8 side.
Reference numeral 2 denotes a moving claw provided so as to protrude toward the joint boom 16 side. The moving claw 55 is pivotally supported by the mounting bracket 12 by the connecting pin 15 and is rotatable around the connecting pin 15. ing. Here, an arc-shaped groove 55 </ b> A having a semicircular cross-sectional shape is formed on the protruding end side of the movable claw 55.
Are formed so as to open upward. Then, by driving a screw mechanism (not shown) provided between the movable claw 55 and the fixed claw 54, the movable claw 55 is moved between an engagement position indicated by a solid line and a disengagement position indicated by a two-dot chain line in FIG. When it moves to the engaging position, the arc groove 55A is engaged with the upper fixing pin 53 of the fixing pins 53 provided on the joint boom 16 side.

The present embodiment has the connecting mechanism 51 as described above.
When the base end of the joining boom 16 is connected to the distal end of the moving claw, first, while the moving claw 55 is held at the detached position shown by the two-dot chain line, as shown in FIG. 55 is inserted between the respective mounting brackets 52 on the joint boom 16 side.

After the arc groove 54A of the fixed claw 54 is engaged with the lower fixed pin 53, the fixed claw 54 and the movable claw 5
By driving the screw mechanism provided between the movable claw 5 and the movable claw 55 to move the movable claw 55 from the disengaged position to the engagement position, the arc groove 55A of the movable claw 55 is engaged with the upper fixed pin 53.

Thus, according to the present embodiment, the arc groove 54A of the fixed claw 54 and the arc groove 55A of the movable claw 55 are
By engaging with the fixing pins 53 provided on the joint boom 16 side, the joint boom 16 of the excavation work subassembly 14 can be easily connected to the distal end side of the common boom 8 using the connecting mechanism 51. Therefore, the pin insertion hole provided in the common boom 8 and the pin insertion hole provided in the joint boom 16 are aligned with each other, as compared with a case where the common boom 8 and the joint boom 16 are connected by using a connecting pin, for example. Such a complicated operation can be eliminated, and the workability when connecting the joint boom 16 to the common boom 8 can be greatly improved.

In the first embodiment described above, when the excavating work sub-assembly 14 is connected to the distal end side of the common boom 8, as shown in FIG. Although the example in which the sub-assembly 14 is placed in a folded state is described as an example, as shown in FIG. 13, the sub-assembly 14 for excavation work may be supported by using a posture holding device 61 described later.

Here, the posture holding device 61 is provided with a mounting table 62 on which the subassembly 14 for excavation work is mounted, and two mounting units 61 which stand on the mounting table 62 and sandwich the joining boom 16 from the left and right directions. (Only one is shown) and a cross beam 65 provided between the columns 63 via a bracket 64 and supporting the joint boom 16 from below. When supporting the excavating sub-assembly 14 as shown in the figure, the posture holding device 61 moves the height position of the pin insertion hole 21A provided on the base end side of the joint boom 16 to a distance from the bottom surface of the mounting table 62. The configuration is such that the posture of the joint boom 16 is maintained so as to be A.

Therefore, by supporting the excavation work sub-assembly 14 by using the above-described posture holding device 61,
When attaching the distal end side of the common boom 8 to the joint boom 16 of the subassembly 14 for excavation work, the joint boom 1
The workability when the excavation work sub-assembly 14 is connected to the distal end side of the common boom 8 can be improved without inadvertently shaking the 6 and the like.

In the first embodiment described above, the case where the latch plate 23 constituting the positioning mechanism 22 is provided on the common boom 8 side, and the stopper 24 and the engaging pin 25 are provided on the joint boom 16 side However, the present invention is not limited to this. For example, a configuration in which the latch plate 23 is provided on the joint boom 16 side and the stopper 24 and the engagement pin 25 are provided on the common boom 8 side may be adopted.

In the above-described second embodiment, the fixing claw 54 and the moving claw 55 of the connecting mechanism 51 are provided on the mounting bracket 12 on the common boom 8 side.
Although the example in which the fixing pins 53 with which are engaged are provided on the mounting bracket 52 on the joint boom 16 side has been described as an example, the present invention is not limited to this. For example, the fixing claws 54 and the moving claws 55
May be provided on the joint boom 16 side, and the fixing pins 53 may be provided on the common boom 8 side.

Further, in each of the above-described embodiments, the crawler-type hydraulic excavator has been described as an example of a construction machine. However, the present invention is not limited to this, and for example, a hydraulic excavator of a wheel type, The present invention can be applied to other construction machines such as cranes.

[0073]

As described in detail above, according to the first aspect of the present invention, the boom mounted on the construction machine main body so as to be able to move up and down is selectively connected to the tip end side of the boom according to the work content. A front device is constituted by the working device to be installed, and a positioning means for positioning the front end side of the boom with respect to the working device between the boom and the working device; and the aligned working device and the tip of the boom. Since the connecting means for connecting the side and the side is provided, only by selectively connecting the working device to the tip side of the boom attached to the construction machine main body, excavation work,
It is possible to assemble a front device according to work contents such as dismantling work. Further, since the position of the working device and the distal end side of the boom can be adjusted by the positioning means, the workability when the working device is connected to the boom by the connecting means can be improved.

According to the second aspect of the present invention, the engaging protrusion provided on one end of the boom and one of the working devices is connected to the engaging portion provided on the other member. By engaging with the concave groove, the boom and the working device are relatively rotated, and when both are positioned, the abutting portion abuts and the relative rotation of both is stopped. The pin holes formed in the side and the working device can be easily aligned in a short time, and the workability when connecting the boom and the working device using the connecting pin can be improved.

Further, according to the third aspect of the present invention, the fixed claw provided on one of the boom and the working device is engaged with one of the plurality of fixed pins provided on the other member. In this state, the movable claw is engaged with the other of the fixing pins, so that the working device can be easily connected to the distal end side of the boom without using a connecting pin or the like that involves a complicated positioning operation.

According to the fourth aspect of the present invention, a plurality of cylinder mounting bosses for selectively mounting the front end of the boom cylinder are provided on the front end of the boom. Since the boom raising / lowering angle at the time of reduction is changed, for example, at the time of dismantling work of a building or the like, the tip side of the working device can be moved to a higher position.
The tip side of the working device can be moved deeper into the ground.

Further, according to the fifth aspect of the present invention, the working device is provided with a connecting boom on the base end side, and the working device is configured to be connected to the distal end side of the boom via the connecting boom. The working device can be connected only by connecting the connecting boom of the working device to the working device.

According to the invention of claim 6, when the working device is connected to the tip end of the boom attached to the construction machine main body, the work is performed by the positioning means provided at the tip end of the can-making structure. In a state where the device and the front end side of the boom are aligned, it is possible to connect the front end side of the boom by the connecting means.

Further, according to the method of assembling the front apparatus for construction equipment according to the seventh aspect of the present invention, in the alignment step, the base end side of the working apparatus is aligned with the distal end side of the boom attached to the construction equipment body. Then, in the connection process, just connect the boom distal end and the working device proximal end,
It is possible to assemble a front device according to work contents such as excavation work and demolition work.

[Brief description of the drawings]

FIG. 1 is an external view showing a first embodiment of the present invention applied to a hydraulic shovel.

2 is an external view showing a state where a subassembly for excavation work is removed from a common boom of the work apparatus in FIG. 1;

FIG. 3 is an exploded perspective view showing, on an enlarged scale, a common boom, a joint boom, a positioning mechanism, and the like in FIG. 1;

FIG. 4 is an enlarged view of a main part showing a common boom, a joint boom, a positioning mechanism and the like in FIG. 1 in an enlarged manner.

FIG. 5 is an enlarged view of a main part showing a state where the pin insertion hole of the common boom and the pin insertion hole of the joint boom are aligned by the alignment mechanism.

FIG. 6 is an external view of a hydraulic excavator showing a state in which the elevation angle of the common boom changes according to the position of a cylinder mounting boss.

FIG. 7 is an external view showing a hydraulic shovel having a sub-assembly for guttering work attached to a common boom tip side.

FIG. 8 is an external view showing a hydraulic excavator having a sub-assembly for dismantling work attached to a distal end side of a common boom.

FIG. 9 is an external view showing a second embodiment of the present invention applied to a hydraulic shovel.

FIG. 10 is an exploded perspective view showing a common boom, a joint boom, a coupling mechanism, and the like in FIG. 9 in an enlarged manner.

FIG. 11 is an enlarged view of a main part of a partially broken part showing a common boom, a joint boom, a coupling mechanism, and the like in FIG. 9;

FIG. 12 is an enlarged view of a partially broken main part showing a state where the common boom and the joint boom are connected by a connecting mechanism.

FIG. 13 is an external view showing a modification of the connecting operation showing a state in which the excavating operation sub-assembly is connected to the common boom using the posture holding device.

[Explanation of symbols]

 2 Upper revolving superstructure (construction machine main body) 7 Front device 8 Common boom (boom) 9, 11 Cylinder mounting boss 10 Boom cylinder 12 Mounting bracket 12A Abutment plate (contact portion) 13, 21A Pin insertion hole (connection means) 14 Excavation work subassembly (working device) 15 Connecting pin (connecting means) 16 Joint boom 22 Positioning mechanism (Positioning means) 23 Latch plate (Latch part) 24 Stopper (Abutment part) 25 Engagement pin (Length) Sub-assembly for side ditching work (working device) 32 Upper boom (joint boom) 41 Subassembly for dismantling work (working device) 42 Joint boom 51 Connecting mechanism 53 Fixing pin 54 Fixing claw 55 Moving claw

Claims (7)

[Claims] 1. A front apparatus for a construction machine mounted on a construction machine main body so as to be capable of raising and lowering, wherein the front apparatus has a base end which is mounted on the construction machine main body so as to be capable of raising and lowering and a boom. A working device that is selectively connected to the distal end of the boom, and between the boom and the working device, the distal end of the boom is positioned relative to the working device when both are connected. For a construction machine, comprising: a positioning means for adjusting; and a connecting means for connecting the working device to a tip end of the boom in a state where the working device and the boom are positioned by the positioning means. Front equipment. 2. The positioning device according to claim 1, wherein said positioning means engages with an engaging projection provided on one end of said boom and one of the working devices and an engaging projection provided on the other member. The boom and the working device are relatively rotated while the engaging projection is engaged with the concave groove of the engaging portion, and the engaging portion comes into contact with the engaging portion when the both are positioned. And a connecting portion, wherein the connecting means integrally connects the working device to the boom through the pin holes formed in the distal end side of the boom and the working device, and inserted into each of the pin holes. 2. The front device for a construction machine according to claim 1, comprising a connecting pin. 3. A construction machine front device mounted on a construction machine main body so as to be capable of elevating movement, wherein the front device has a boom whose base end side is mounted on the construction machine main body so as to be capable of elevating movement and a work content. A working device selectively connected to the tip side of the boom, and a connection mechanism for detachably connecting the working device to the boom is provided between the boom and the working device; The connecting mechanism is provided with a mounting bracket provided on one of the boom and the working device, a plurality of fixing pins provided on the other member, and fixedly provided on the mounting bracket. A fixed claw that is engaged with at least one of the fixed pins, and a movable claw that is rotatably supported by the mounting bracket and that is engaged with the other fixed pin of the fixed pins. A front device for a construction machine, wherein the front device is constituted. 4. A plurality of cylinder mounting bosses for selectively mounting a front end of a boom cylinder is provided on a front end side of the boom, and the boom is raised and lowered when the boom cylinder is fully extended or contracted. 4. The front apparatus for a construction machine according to claim 1, wherein the angle is changed. 5. The working device according to claim 1, further comprising a joint boom on a base end side, wherein the working device is connected to a distal end side of the boom via the joint boom. Equipment for construction machinery. 6. A construction machine front comprising a box-shaped can-making structure, a base end of which is attached to the construction machine main body so as to be able to move up and down, and a tip end to which a working device is selectively connected in accordance with work contents. In the boom used in the device, a positioning means for performing positioning with the working device, and a connecting device for connecting the working device positioned by the positioning device, to a tip side of the can-making structure. A boom for use in a front device for construction machinery, comprising a connecting means. 7. A construction machine front comprising: a boom having a base end mounted on a construction machine main body so as to be capable of raising and lowering; and a working device selectively connected to a tip end of the boom in accordance with work content. A method of assembling a device, comprising: a positioning step of positioning a distal end side of the boom with respect to a proximal end side of the working device; and A method for assembling a front device for a construction machine, comprising a connecting step of connecting.