JP3519635B2 - Construction machinery - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine suitable for use in, for example, dismantling work for dismantling a building or the like, or loading work in which scraps generated by the dismantling work are loaded on a truck or the like.

[0002]

2. Description of the Related Art Generally, as a construction machine suitably used for demolition work of a building, a wheel-type traveling body, and a revolving body provided on the traveling body so as to be revolvable around a position of a center joint, There is known a construction machine including a work device attached to the revolving structure, self-propelled to a work site by a traveling structure, and performing the dismantling work of a building or the like using the work device at the work site.

By the way, in this type of construction machine, since the wheel type traveling body safely travels on public roads and the like until it arrives at the work site, it is necessary to fold the entire working device into a small size during traveling.

Therefore, the base end side is attached to the revolving structure so that the first boom can be raised and lowered, the second boom is attached to the tip end side of the first boom so that it can be raised and lowered, and the tip end of the second boom. Side arm attached so as to be able to raise and lower, a work tool attached to the tip end side of the arm, a first boom cylinder that raises and lowers the first boom, and a second boom that raises and lowers the second boom. A construction machine provided with a working device including a cylinder, an arm cylinder provided between the second boom and the arm, and a work implement cylinder provided between the arm and the work implement has been proposed (for example, , JP-A-6-136779, etc.).

In the construction machine equipped with the above-described work device according to the prior art, the first work boom and the second boom are folded so as to approach each other during traveling, so that the work device as a whole is folded in a small running posture. After arriving at the work site, the construction work such as dismantling the building is performed in a state where the work posture in which the first boom and the second boom are extended is maintained.

[0006]

However, in the above-mentioned prior art, the base end side (bottom side) of the second boom cylinder is used.
Is attached to the rear side of the attachment position of the first boom with respect to the revolving structure, and the tip side (rod side) is attached to the rear side of the attachment position of the second boom with the first boom. When the boom cylinder extends, the first boom and the second boom maintain the traveling posture, and when the second boom cylinder contracts, the first boom and the second boom maintain the working posture. .

For this reason, during dismantling work performed with the first boom and the second boom held in the work posture,
The work reaction force acting on the second boom through the work implement and the arm cannot be received by the reduced second boom cylinder,
It may not be possible to maintain the second boom in a proper work posture.

Further, in order to increase the holding force of the second boom by the second boom cylinder, the mounting position between the tip end side of the second boom cylinder and the second boom is set larger than the mounting position between the first boom and the second boom. If they are separated from each other, when the work device is folded in the traveling posture, the attachment portion between the tip end side of the second boom cylinder and the second boom protrudes rearward from the rear end portion of the revolving structure, and thus the public road, etc. There is a risk that safety may be impaired when traveling on the road.

Further, in the above-mentioned conventional technique, in order to prevent the base end sides of the first boom and the first boom cylinder from interfering with the center joint, the working device is located at the position of the center joint, that is, in the left and right directions of the revolving structure. It is structured so that it can be lifted and lowered at a position that substantially coincides with the center of. For this reason,
When the cab is placed at a position in the revolving structure that does not interfere with the elevation of the working device, the width of the cab in the left and right directions is kept small by the vehicle width restriction, and the habitability is significantly reduced. There is a problem that it will end up.

Further, in the above-mentioned conventional technique, the first boom cylinder is provided between the revolving structure and the second boom, and the second boom cylinder is provided between the first boom and the second boom. . Therefore, when raising and lowering the first boom, it is necessary to extend and contract the first boom cylinder and the second boom cylinder, which makes it difficult for the operator to understand the operation of the work device, and there is a problem that workability is poor.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a construction machine capable of improving workability when performing dismantling work or the like using a work device.

[0012]

In order to solve the above-mentioned problems, the present invention provides a traveling body, a revolving body provided on the traveling body so as to be revolvable around a position of a center joint, and attached to the revolving body. The present invention is applied to a construction machine equipped with the working device.

According to a first aspect of the present invention, in the working device, an intermediate portion in the lengthwise direction is bent in a substantially V shape as a bent portion, and a base end side is located rearward of the center joint. No. 1 attached to the swinging body so that it can be lifted and lowered
A boom, a second boom in which a middle portion in the length direction is bent as a bent portion in a substantially V shape, and a base end side thereof is connected to a tip end side of the first boom so as to be able to lift and lower; And a work implement attached directly to the distal end side of the first boom, and a base end side of which is located forward of the center joint to raise and lower the first boom, and which is attached to a revolving structure and the distal end side of which is the first boom. A first boom cylinder substantially coaxially connected to the mounting position of the first boom and a second boom, and a base end side of which is attached to a concave side of the bent portion of the first boom and a front end side of which is the second side in order to raise and lower the second boom. The second boom cylinder is attached to the concave portion of the bent portion of the boom.

As described above, the first boom and the second boom are formed by bending the first boom and the second boom in a substantially V shape with the middle portion in the lengthwise direction as the bending portion, and the second boom is formed on the concave portion of the bending portion of the first boom. By attaching the base end side of the boom cylinder and attaching the tip side of the second boom cylinder to the concave side of the bent portion of the second boom,
The second boom can be in a work position in which the second boom is extended from the first boom while the second boom cylinder is extended.
Therefore, the work reaction force acting on the second boom through the work implement or the like can be received with sufficient force while the second boom cylinder is extended, and the second boom can be held in an appropriate work posture. it can.

Moreover, by forming the first boom and the second boom in a V shape, a large space is formed between the concave portion of the bending portion of the first boom and the concave portion of the bending portion of the second boom. Therefore, the second boom cylinder having a large cylinder diameter can be accommodated in this space, and workability such as dismantling work can be further improved.

Further, the base end side of the first boom is located rearward of the center joint and attached to the swing body, and the base end side of the first boom cylinder is located forward of the center joint and attached to the swing body. As a result, since the base end side of the first boom and the base end side of the first boom cylinder are separated in the front and rear directions with the center joint interposed therebetween, the first boom and the first boom cylinder may interfere with the center joint. The work device can be smoothly lowered and raised.

Further, since the tip end side of the first boom cylinder is connected substantially coaxially with the mounting position of the first boom and the second boom, the first boom cylinder can directly raise and lower the first boom. it can.

According to a second aspect of the present invention, there is provided a construction comprising a traveling body, a revolving body provided on the traveling body so as to be revolvable around a position of a center joint, and a working device attached to the revolving body. In the machine, the working device is formed by bending the middle part in the longitudinal direction as a bent part in a substantially V shape, and the base end side is located rearward of the center joint and is attached to the revolving structure so that it can be lifted and lowered. A first boom; a second boom in which a middle portion in the lengthwise direction is bent as a bent portion in a substantially V shape and a base end side of which is connected to a tip end side of the first boom so as to be able to lift and lower; 2 An arm provided on the tip side of the boom so as to be able to descend and rise, a work tool attached to the tip side of the arm, and a base end side of which is located in front of the center joint for raising and lowering the first boom. Tip attached to revolving structure Is a first boom cylinder connected substantially coaxially to the mounting positions of the first boom and the second boom, and a base end side of which is mounted on the concave side of the bent portion of the first boom for raising and lowering the second boom. A second boom cylinder whose tip side is attached to the concave side of the bent portion of the second boom;
An arm cylinder provided between the boom and the arm,
It is configured by a working tool cylinder provided between the arm and the working tool.

According to a third aspect of the present invention, the tip end side of the first boom cylinder is configured to be attached to the attachment position of the first boom and the second boom using a common attachment pin.

With this configuration, the tip end side of the first boom cylinder can be attached to the attachment position of the first boom and the second boom using a single attachment pin. According to a fourth aspect of the invention, the work is provided on the front side of the revolving structure.
Install a lifting device at a position that does not interfere with the elevation of the device,
The lifting device is provided with a cab that defines a driver's cab
There is that. This allows the operator in the cab
Is high when the cab is raised by the lifting device.
Dismantling a building while overlooking the work site from a wide range
You can do business. The invention of claim 5 is the work described above.
The tool is a tool for dismantling and / or loading.
It is a pluck device.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A construction machine according to an embodiment of the present invention is applied to a wheel type construction machine used for demolition work of a building as an example, and FIGS. 1 to 9 are referred to. I will explain.

In the figure, 1 is a wheel type traveling body,
The traveling body 1 includes a chassis 2 and front and rear sides of the chassis 2.
.., which are provided at four positions on the left and right and are rotatably driven by hydraulic motors (not shown) for traveling.

Reference numeral 4 denotes an upper revolving structure which is mounted on the traveling structure 1 via a revolving device 5 so as to be revolvable.
A revolving frame 6 and a cab 7 which is disposed on the right side of the front of the revolving frame 6 and which does not interfere with the elevation of a working device 21 described later via a cab lifting device 10 described later, and which defines a driver's cab inside. , A building cover 8 provided behind the cab 7 on the revolving frame 6 and accommodating an engine, a hydraulic pump (neither of which is shown), and the like, and a rear side of the building cover 8 for revolving. The counter weight 9 is generally composed of a counterweight 9 provided at the rear end of the frame 6.

A space portion 8A, which is located on the rear side of the work device 21 and extends in the front and rear directions, is formed in the middle portion of the building cover 8 in the left and right directions. When the working device 21 takes the traveling posture shown in FIG. 1, the working device 21 is housed.

Reference numeral 10 indicates that the cab 7 is moved up on the revolving frame 6,
This is a cab lifting device that lifts and lowers downward. This cab lifting device 10 is provided in a corner portion on the right side of the front part of the revolving frame 6 that does not interfere with the elevation of the working device 21.

That is, the cab lifting device 10 includes at least the first boom cylinders 3 which will be described later and constitute at least the working device 21.
It is arranged on the right side of the first boom cylinder 35 on the right side among the five. Then, as shown in FIGS. 3 and 4, the cab lifting device 10 is located on the front side of the bottom side mounting portion of the first boom cylinder 35, is erected on the revolving frame 6, and extends upward and downward. Left and right pair of guide columns 1
1, 11 and a movable base 12 that supports the cab 7 and that can be moved along the guide column 11 by a fitting portion 12A that slidably fits to the guide column 11, a revolving frame 6, and a movable platform. Three lifting cylinders 13, which are arranged between
13 and so on. In addition, the swivel frame 6
A cylinder housing frame 14 that is located below the moving table 12 and forms a housing space for each lifting cylinder 13 is provided between the revolving frame 6 and the moving table 12 above the moving table 12.

Here, on the upper surface side of the revolving frame 6,
Two front brackets 15, 15 spaced apart in the left and right directions
And one rear bracket 16 located on the rear side of each front bracket 15. In addition, one front bracket 17 and two rear brackets 18, 18 positioned rearward of the front bracket 17 and spaced apart in the left and right directions are provided on the lower surface side of the movable table 12. There is.

Two of the elevating cylinders 13 are pin-connected to the front bracket 15 of the revolving frame 6 on the bottom side and are pin-connected to the rear bracket 18 of the moving base 12 on the rod side. Of the remaining one, the bottom side is pin-connected to the rear bracket 16 of the revolving frame 6 and the rod side is the moving table 12
Is connected to the front bracket 17 by a pin.

Therefore, by expanding and contracting each of the lifting cylinders 13, the movable table 12 moves upward and downward along the guide columns 11, and the cab 7 contacts the upper surface of the cylinder housing frame 14 of the movable table 12. The movable table 12 is moved up and down between the lowered position shown in FIG. 1 and the raised position shown in FIG.

Reference numeral 19 denotes a center joint provided at the center of the turning wheel which constitutes the turning device 5. The center joint 19 is a hydraulic motor for traveling provided on the side of the traveling body 1 for driving the wheel 3 (see FIG. (Not shown) and a hydraulic pump provided in the building cover 8 of the upper swing body 4 are connected. The upper revolving structure 4 is revolving around the position of the center joint 19 by the revolving device 5.

Reference numerals 20 and 20 denote left and right support brackets provided on the revolving frame 6 for supporting the working device 21, and these support brackets 20 face each other with the center joint 19 sandwiched from the left and right directions. And projects above the swivel frame 6.

Here, as shown in FIG. 2, the imaginary line in the front and rear directions passing through the center of the center joint 19 is taken as AA, and the front and rear directions passing through the left and right centers of the respective support brackets 20. When the virtual line is B-B, the support bracket 20 is arranged at a position where the virtual line B-B is offset to the left by the distance L from the virtual line A-A.

Reference numeral 21 denotes a working device mounted on the support bracket 20 so as to be able to move up and down. The working device 21 includes a first boom 22, a second boom 24, an arm 30, a grapple device 33, and a first boom cylinder 35 which will be described later. , Second boom cylinder 36, arm cylinder 37, work implement cylinder 3
It is composed of 8 etc.

The working device 21 is supported by the above-mentioned support bracket 20, so that the imaginary line AA passing through the center of the center joint 19, that is, the upper swing body 4.
It is arranged at a position offset to the left side (one side in the left and right directions) from the center in the left and right directions. Therefore, the cab 7 disposed on the right side (left side, the other side in the right direction) of the imaginary line AA passing through the center of the center joint 19 is left and right by the amount by which the working device 21 is offset to the left side. The width in the direction can be increased, and the interior of the cab can be expanded to enhance habitability.

Reference numeral 22 denotes a first boom whose base end side is attached to the support bracket 20 so as to be able to move up and down.
2 is formed by a rectangular tubular body having a rectangular cross section having an upper surface portion, a lower surface portion, and left and right side surface portions, and an intermediate portion in the longitudinal direction is bent into a substantially V shape as a bent portion.

Here, a foot portion 22A is provided on the base end side of the first boom 22, and the foot portion 22A is pin-connected to a portion of each support bracket 20 located rearward of the center joint 19. ing. Further, as shown in FIG. 5, a bifurcated bracket 22B is provided on the tip end side of the first boom 22, and the second boom 24 can be raised and lowered by a mounting pin 27 described later on the bracket 22B. Installed. Further, on the lower surface of the first boom 22, on the side of the recess 22C corresponding to the bent portion, the second
A bracket 23 for the boom cylinder 36 is provided.

Reference numeral 24 is a second boom which is attached to the tip end side of the first boom 22 so as to be able to move upward and downward.
Is formed by a rectangular tubular body having a rectangular cross section having an upper surface portion, a lower surface portion, and left and right side surface portions, and an intermediate portion in the lengthwise direction is bent into a substantially V shape as a bent portion.

Then, as shown in FIG. 5, the second boom 2
A cylindrical boss portion 24A is provided on the base end side of 4, and the boss portion 24A is pin-connected to the bracket 22B of the first boom 22 by a mounting pin 27. Also, the second
A recess 24B corresponding to the bent portion of the lower surface of the boom 24
The bracket 25 for the second boom cylinder 36 is provided on the side, and the bracket 26 for the arm cylinder 37 is provided on the side of the convex portion 24C corresponding to the bent portion of the upper surface of the second boom 24. .

27 is a bracket 22B of the first boom 22
As shown in FIG. 5, the mounting pin 27 is a mounting pin for attaching the boss portion 24A of the second boom 24 to the bracket 22B of the first boom 22 and the boss portion 2 of the second boom 24.
4A is inserted.

Here, both ends of the mounting pin 27 become projecting ends 27A, 27A which project leftward and rightward from the bracket 22B of the first boom 22, and each projecting end 27A of the first boom cylinder 35 will be described later. The rod side mounting eye 35B and the cylindrical collar 28 are axially inserted. The collar 28 is fixed to the projecting end 27A by a bolt 29 that is inserted through the mounting pin 27 in the radial direction, and prevents the mounting pin 27 from being pulled out in the axial direction.

Reference numeral 30 denotes an arm attached to the tip end side of the second boom 24 so as to be able to move up and down. The arm 30 is formed by a rectangular tubular body having a rectangular cross section having an upper surface portion, a lower surface portion, and left and right side surface portions. Has been done. A bracket 31 is provided at the base end of the arm 30.
Is pin-connected to the tip side of the second boom 24. Further, the arm cylinder 3 is provided on the upper surface of the arm 30 on the base end side.
Brackets 32 for 7 and work implement cylinders 38 are provided.

Reference numeral 33 indicates a link mechanism 3 on the tip side of the arm 30.
The grapple device 33 is a work tool attached via 4 and includes a claw member 33A that opens and closes between a closed position indicated by a solid line and an open position indicated by a two-dot chain line in FIG. The claw member 33A is used to perform a dismantling operation for dismantling a building, a loading operation for gripping scraps generated by the dismantling operation, and loading the scraps on a transportation truck or the like.

Reference numerals 35 and 35 are two first boom cylinders for raising and lowering the first boom 22, and a bottom side mounting eye 35A is provided on the base end side of each first boom cylinder 35.
The bottom-side mounting eye 35A is provided on the center joint 19 of the support bracket 20 provided on the swivel frame 6.
It is pin-coupled to the site located on the front side.

A rod-side mounting eye 35B is provided on the tip side of each first boom cylinder 35, and this rod-side mounting eye 35B is mounted on the projecting end 27A of the mounting pin 27. That is, the tip end side (rod side mounting eye 35B) of the first boom cylinder 35 uses the common mounting pin 27 at the mounting position of the first boom 22 (bracket 22B) and the second boom 24 (boss portion 24A). It is configured to be mounted coaxially.

Then, for example, when the traveling body 1 is traveling, as shown in FIG. 1, the first boom cylinder 35 is extended to maintain the traveling posture in which the first boom 22 is tilted to the counterweight 9 side and is disassembled. When doing work,
As shown in FIG. 6, by contracting the first boom cylinder 35, the first boom 22 is configured to maintain the standing work posture.

Reference numeral 36 denotes a single second boom cylinder provided between the first boom 22 and the second boom 24, and the second boom cylinder 36 is for raising and lowering the second boom 24. Here, a bottom side mounting eye 36A is provided on the base end side of the second boom cylinder 36, and the bottom side mounting eye 36A is the concave portion 22 of the bent portion of the first boom 22.
It is pin-connected to the bracket 23 provided on the C side. A rod-side mounting eye 36B is provided on the tip side of the second boom cylinder 36.
Is pin-coupled to a bracket 25 provided on the concave portion 24B side of the bent portion of the second boom 24.

Then, for example, when the traveling body 1 travels, as shown in FIG. 1, the second boom cylinder 36 is contracted to maintain the traveling posture in which the second boom 24 is folded to the first boom 22 side. However, when performing dismantling work,
As shown in FIG. 6, the second boom cylinder 36 is extended to maintain the extended work posture of the second boom 24.

Reference numeral 37 is an arm cylinder provided between the second boom 24 and the arm 30.
The base end side (bottom side) of 7 is pin-connected to the bracket 26 provided on the second boom 24, and the tip end side (rod side) is
It is pin-connected to a bracket 32 provided on the arm 30. The arm cylinder 37 expands and contracts, so that the arm 30 is elevated and lowered on the tip side of the second boom 24.

Reference numeral 38 denotes a working tool cylinder provided between the arm 30 and the grapple device 33. A base end side (bottom side) of the working tool cylinder 38 is pin-connected to a bracket 32 provided on the arm 30. The tip side (rod side) is pin-connected to a link mechanism 34 that connects the arm 30 and the grapple device 33. Then, by expanding and contracting the work implement cylinder 38, the grapple device 33 is elevated and lowered on the tip side of the arm 30 via the link mechanism 34.

The construction machine according to the present embodiment has the above-mentioned structure, and its operation will be described below.

First, when self-propelled to the dismantling work site, the first boom cylinder 35 is extended and the first boom 2 is moved.
2 to the counterweight 9 side, the second boom cylinder 36 is contracted to fold the second boom 24 to the first boom 22 side, the arm cylinder 37 extends the arm 30 forward, and the work implement cylinder 38 extends. By folding the grapple device 33 toward the arm 30 side, the working device 21 is held in the traveling posture shown in FIG.

Further, by contracting each elevating cylinder 13 of the cab elevating device 10, the wheel 3 is rotated while the cab 7 is held in the lowered position so that the traveling body 1 travels to the dismantling work site. Run on its own.

After arriving at the dismantling work site,
By extending each lifting cylinder 13 of the cab lifting device 10, the cab 7 is moved from the lowered position to the raised position. Further, by contracting the first boom cylinder 35 to erect the first boom 22, and extending the second boom cylinder 36 to extend the second boom 24 upward, the working device 21 is moved to the position shown in FIG. Change to the work posture shown.

In this way, after the first boom 22 and the second boom 24 are in the working posture, the arm cylinder 37 raises and lowers the arm 30, and the work tool cylinder 38 raises and lowers the grapple device 33, while the grapple device 33 is raised and lowered. The claw member 33A of 33 is opened and closed. In this way
The grapple device 33 performs a demolition work of a building and a loading work of loading scraps generated by the demolition work on a truck for transportation or the like.

Here, according to the construction machine of the present embodiment, the first boom 22 is self-propelled to the dismantling work site.
The second boom cylinder 36 can be housed between the concave portion 22C of the first boom 22 and the concave portion 24B of the second boom 24 in a state where the second boom 24 and the second boom 24 are held in the folded traveling posture. Therefore, the entire working device 21 can be folded in a small size, and the safety when traveling on a public road can be improved.

On the other hand, when the building is dismantled, the second boom 24 is supplied with pressure oil when the second boom cylinder 36 extends, that is, in the bottom side oil chamber of the second boom cylinder 36. Sometimes it takes a working posture. For this reason, as compared with the case where the second boom cylinder is contracted, that is, when the working posture is set when the pressure oil is supplied to the rod-side oil chamber of the second boom cylinder, as in the related art, for example, the grapple It is possible to reliably hold the second boom 24 in the work posture against the reaction reaction force acting on the second boom 24 via the device 33, the arm 30, etc., and improve workability such as dismantling work. it can.

Moreover, the first boom 22 and the second boom 24
Are formed in a substantially V shape with the middle portion in the length direction being a bent portion, so that the concave portion 22 of the bent portion of the first boom 22 is formed.
Since a large space can be formed between C and the concave portion 24B of the bent portion of the second boom 24, the second boom cylinder 36 having a large cylinder diameter can be accommodated in this space. Therefore, during the dismantling work, the grapple device 33
The work reaction force acting on the second boom 24 through the above can be received by the second boom cylinder 36 having a large cylinder diameter, and the workability can be further improved.

The base end side (foot portion 22A) of the first boom 22 is located rearward of the center joint 19 and is attached to the support bracket 20.
Since the base end side (bottom side attachment eye 36A) of 5 is attached to the support bracket 20 by being located in front of the center joint 19, the first boom 22 and the first boom cylinder 35 may interfere with the center joint 19. Therefore, the working device 21 can be smoothly shifted from the running posture to the working posture.

Moreover, the working device 21 is arranged so as to be offset to the left side of the virtual line AA passing through the center of the center joint 19, and the cab 7 is placed on the right side of the virtual line AA passing through the center of the center joint 19. By disposing the working device 21 on the left side, the width of the cab 7 in the left and right directions can be increased by an amount that is offset to the left side. This allows
The driver's cab defined by the cab 7 can be expanded, and habitability can be enhanced.

The tip side of the first boom cylinder 35 (rod side mounting eye 35B) is mounted by a mounting pin 27 at the mounting position of the first boom 22 (bracket 22B) and the second boom 24 (boss portion 24A). Therefore, as compared with a configuration in which the tip end side of the first boom cylinder is mounted at a position different from the mounting position of the first boom in the second boom, for example, as in the prior art, the first boom cylinder 35 It is easy for the operator to understand the operation of the first boom 22 when expanding and contracting, and it is possible to improve workability during dismantling work.

Further, during the dismantling work, the cab 7 can be held in the raised position by the cab lifting device 10, so that the operator inside the cab 7 can use the grapple device 33 while looking over the work site from a high position. It is possible to perform the dismantling work of the existing building or the loading work of loading the scrap generated by the dismantling work onto the truck for transportation or the like, and the workability thereof can be improved.

In the above-described embodiment, the case where the grapple device 33 is used as the work tool has been described as an example.
The present invention is not limited to this, and a breaker 41 for crushing a building or the like may be used as a work tool as in a modification shown in FIG. 7, for example, and another modification shown in FIG. 8, for example. As in the example, the lifting magnet 51 for adsorbing the reinforcing bars, the iron scraps, and the like to be loaded on the transportation truck or the like may be used as the working tool.

Further, in the above-mentioned embodiment, the arm 30 is attached to the tip end side of the second boom 24 so as to be able to move up and down.
A working tool (grapple device 3 is provided on the tip side of the arm 30.
Although the case where 3) is attached is taken as an example, the present invention is not limited to this. For example, as in another modified example shown in FIG. The boom 24 may be directly attached to the tip side.

[0064]

As described in detail above, according to the first and second aspects of the invention, the first boom and the second boom are formed by bending the first boom and the second boom in a substantially V shape with the middle portion in the longitudinal direction as the bent portion. And first
Since the base end side of the second boom cylinder is attached to the concave side of the bent portion of the boom and the tip end side of the second boom cylinder is attached to the concave side of the bent portion of the second boom, the second boom cylinder is In the extended state, the second boom can be in the work posture in which it is extended from the first boom. Therefore, the work reaction force acting on the second boom through the work implement or the like can be received with sufficient force while the second boom cylinder is extended, and the second boom can be held in an appropriate work posture. it can.

Further, by forming the first boom and the second boom in a substantially V shape, a large space is formed between the concave portion of the bent portion of the first boom and the concave portion of the bent portion of the second boom. Therefore, the second boom cylinder having a large cylinder diameter can be accommodated in this space, and workability such as dismantling work can be further improved.

Moreover, when the first boom and the second boom are in the traveling posture in which the first boom and the second boom are folded, the second boom cylinder is housed between the concave portion of the bent portion of the first boom and the concave portion of the bent portion of the second boom. By suppressing the vehicle height during traveling, it is possible to ensure safety when traveling on a public road, for example.

Further, the base end side of the first boom is located rearward of the center joint and attached to the swing body, and the base end side of the first boom cylinder is located forward of the center joint and attached to the swing body. With this configuration, the base end side of the first boom and the base end side of the first boom cylinder are separated from each other in the front and rear directions with the center joint interposed therebetween, and the first boom and the first boom cylinder are separated from each other by the center joint. The working device can be smoothly lowered and lowered without interfering with the. For this reason, it is not necessary to provide the work device substantially at the center of the revolving structure in the left and right directions, and the work device can be arranged so as to be offset from the center of the revolving structure in the left and right directions. Only by increasing the width of the cab in the left and right directions, it is possible to enhance the habitability in the cab.

Further, since the tip end side of the first boom cylinder is connected to the mounting position of the first boom and the second boom substantially coaxially, the first boom cylinder directly raises and lowers the first boom. be able to. Therefore, for example, the operation of the first boom is easier for the operator to understand than the structure in which the first boom is lifted and lowered by the first boom cylinder and the second boom cylinder, and the dismantling work or the like is performed using the work device. The workability at the time can be improved.

Further, according to the invention of claim 3, since the tip end side of the first boom cylinder is configured to be mounted at the mounting position of the first boom and the second boom using the common mounting pin, the first boom cylinder is mounted. Set the tip side of the boom cylinder to the first boom and the second boom.
Since it can be attached to the boom at the attachment position using a single attachment pin, the configuration can be simplified and the number of parts can be reduced. According to the invention of claim 4, the revolving structure
The lifting device at a position where it does not interfere with the elevation of the working device.
And the lifting device is provided with a cab that defines the cab.
Because of the configuration, the operator in the cab can
Therefore, with the cab raised, the work
Performing demolition work of buildings, etc.
You can According to the invention of claim 5, the work implement is
Graps for dismantling and / or loading
It may be a device.

[Brief description of drawings]

FIG. 1 is a front view showing a wheel-type construction machine according to an embodiment of the present invention.

FIG. 2 is a plan view showing the construction machine in FIG. 1 with a part of a working device omitted.

FIG. 3 is an enlarged front view showing a first boom, a second boom, a cab lifting device, etc. in FIG. 1 in an enlarged manner.

FIG. 4 is a left side view of the cab and the cab elevating device in an enlarged manner as seen from the direction of arrows IV-IV in FIG. 3.

5 is an enlarged cross-sectional view showing a mounting portion of the first boom, the second boom, and the first boom cylinder, as viewed in the direction of the arrow VV in FIG.

FIG. 6 is a front view showing the construction machine in a state where the work device is in a work posture.

FIG. 7 is a front view similar to FIG. 6 showing a modified example of the construction machine provided with a breaker as a work tool.

FIG. 8 is a front view similar to FIG. 6 showing another modification of the construction machine provided with a lifting magnet as a work tool.

FIG. 9 is a front view similar to FIG. 6 showing another modified example of the construction machine in which the work implement is attached to the tip side of the second boom.

[Explanation of symbols]

1 running body 4 Upper revolving structure 19 center joint 21 Working device 22 First boom 22A foot part (base end side) 22B bracket (tip side) 22C recess 24 second boom 24A Boss (base end side) 24B recess 27 mounting pins 33 Grapple device (work implement) 35 First Boom Cylinder 35A Bottom side mounting eye (base end side) 35B Rod side mounting eye (tip side) 36 Second boom cylinder 36A Bottom side mounting eye (base end side) 36B Rod side mounting eye (tip side) 41 Breaker (work implement) 51 Lifting magnet (work implement)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shown 47-30372 (JP, U) Shown 63-156239 (JP, U) Shown Flat 3-25638 (JP, U) Shown 61- 202559 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B66C 23/68

Claims (5)

(57) [Claims] 1. A construction machine comprising a traveling body, a revolving body provided on the traveling body so as to be rotatable about a position of a center joint, and a work device attached to the revolving body, the work comprising: In the device, a first portion is formed by bending a middle portion in a length direction as a bent portion into a substantially V shape, a base end side of which is located rearward of the center joint, and which is attached to the revolving structure so as to be able to move upward and downward. A boom, and a second boom in which a middle portion in the longitudinal direction is bent as a bent portion in a substantially V shape, and a base end side of the boom is connected to a tip end side of the first boom so as to be able to lift and lower.
A work implement attached directly to the tip end side of the second boom or via an arm, and attached to the revolving structure with a base end side of which is located in front of the center joint for raising and lowering the first boom. A first boom cylinder whose front end side is connected to the mounting position of the first boom and the second boom substantially coaxially, and a base end side concave portion of the bent portion of the first boom for raising and lowering the second boom. And a tip end side of the second boom is attached to the recessed side of the bent portion of the second boom. 2. A construction machine comprising: a traveling body; a revolving body provided on the traveling body so as to be rotatable about a position of a center joint; and a working device attached to the revolving body. In the device, a first portion is formed by bending a middle portion in a length direction as a bent portion into a substantially V shape, a base end side of which is located rearward of the center joint, and which is attached to the revolving structure so as to be able to move upward and downward. A boom, and a second boom in which a middle portion in the longitudinal direction is bent as a bent portion in a substantially V shape, and a base end side of the boom is connected to a tip end side of the first boom so as to be able to lift and lower.
An arm provided on the distal end side of the second boom so as to be able to lift and lower, a work tool attached to the distal end side of the arm, and a base end side that is forward of the center joint in order to lift and lower the first boom. A first boom cylinder that is attached to the revolving structure and is connected to the attachment position of the first boom and the second boom at substantially the same position as the first boom cylinder;
A second boom cylinder, the base end side of which is attached to the recess side of the bent portion of the first boom, and the tip end side of which is attached to the recess side of the bent portion of the second boom for raising and lowering the boom; and the second boom and arm. A construction machine comprising an arm cylinder provided between the arm and the work tool cylinder provided between the arm and the work tool. 3. The construction machine according to claim 1, wherein the tip end side of the first boom cylinder is configured to be attached to the attachment position of the first boom and the second boom using a common attachment pin. 4. A depression of the working device on the front side of the revolving structure.
A lifting device is installed at a position where it does not interfere with the elevation,
The device shall not be equipped with a cab that defines the cab.
The construction machine according to claim 1, 2, or 3. 5. The work tool is a dismantling work and / or a stacking work.
It is a grapple device for performing a plugging operation.
The construction machine according to 2, 3, or 4.