JP2000234348A - Construction machine with boom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent hydraulic pipes from being exposed on the side face of a boom even when a control valve is arranged in the front of the rotation center of the boom. SOLUTION: A right frame 38b is connected to the right side of a main frame 38a rotatably connected with a front attachment 31 having a boom 31B. A control valve 54 is arranged on the side front section of the boom 31B of the right frame 38b. Boom side pipes LBA, LBK connecting arm/bucket hydraulic cylinders 3AC, 31KC and the control valve 54 are arranged behind the boom 31B. One end of a first main body side pipe LHA1 is connected to the other ends of the boom side pipes LBA, LBK, and the other end is connected to a connecting block CA located at the vehicle rear of the boom 31B on the main frame 38a. One end of a second main body side pipe LHA2 is connected to the connecting block CA, and the other end is connected to the control valve 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine having a boom in which a control valve is disposed at a front portion on a side of a boom on one of right and left frames of a main frame.

[0002]

2. Description of the Related Art Conventionally, there has been known a hydraulic shovel in which a main frame to which a front attachment is rotatably connected and left and right frames disposed on the left and right sides of the main frame are upper revolving frames. BACKGROUND ART A front attachment of a hydraulic shovel often includes a boom driven by a boom cylinder, an arm driven by an arm cylinder, and a bucket driven by a bucket cylinder.
These hydraulic cylinders are driven and controlled by controlling the flow of pressure oil from a hydraulic pump with a control valve.

[0003]

In recent years, there has been a case where a control valve is disposed at a front portion of one of the left and right frames on the side of the boom due to a demand for miniaturization of a hydraulic shovel. Usually, as piping of two hydraulic cylinders used for the arm and bucket,
Four pipes are juxtaposed and fixed on the back (top) of the boom,
The front end is connected to each hydraulic cylinder by a rubber hose, while the rear end is connected to a relay connection block provided on the side surface of the boom, and the connection block and the control valve are connected by piping such as a rubber hose. Therefore, in addition to the possibility that the piping is exposed on the side surface of the boom to cause breakage, the appearance is impaired.

An object of the present invention is to provide a construction machine having a boom in which hydraulic piping is not exposed on the side of the boom.

[0005]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIGS. (1) The first aspect of the present invention provides a main frame 38a to which a front attachment 31 having a boom 31B is rotatably connected, left and right frames 38b and c disposed on the left and right of the main frame 38a, and a hydraulic pump 52. And a control valve 54 for controlling the flow of pressure oil from the controller to supply pressure oil to the front attachment actuators 31AC and 31KC.
A pipe connecting the AC, 31KC and the control valve 54 extends to the back of the boom 31B and has one end connected to the front attachment actuators 31AC, 31KC and the other end connected to the control valve 54, respectively. LB
Applies to construction machines having at least K. And
The following configuration is employed to achieve the above object.
That is, the control valve 54 is disposed at one of the boom side front portions of the left and right frames 38b and 38c, and the boom side pipe LB
In connecting the other ends of A and LBK to the control valve 54,
The other ends of the main body side pipes LHA1, LHK2 and LHK1, with one end connected to the other end of the boom side pipes LBA, LBK,
It is routed on the main frame 38a to relay points CA and CK located behind the boom 31B on the vehicle, and then connected to the control valve 54. (2) The invention according to claim 2 is the construction machine according to claim 1, wherein the main body side pipes LHA1 and 2 (LHK1, 2) are formed as a single rubber hose, and the intermediate portion of the rubber hose is provided at the relay point CN (FIG. 8). Is fixed. (3) The construction machine according to the first aspect, wherein the main body-side pipe is constituted by first and second main body-side pipes, and connection portions CA and CK are provided at a relay point. One ends of the side pipes LHA1 and LHK1 are connected to the boom side pipes LBA and LBA.
The other end of BK and the other end are connected to connecting portions CA and CK, respectively, and the second main body side pipes LHA2 and LH
One end of K2 is connected to the connection portions CA and CK, and the other end is connected to the control valve 54, respectively. (4) The boom hydraulic cylinder 31B
A main frame 38a to which a front attachment 31 including a boom 31B driven by C, an arm 31A driven by an arm hydraulic cylinder 31AC, and a work implement 31K driven by a work implement hydraulic actuator 31KC is connected. Left and right frames 38b and 38c disposed on the left and right of the frame 38a;
Boom hydraulic cylinder 3 by controlling the flow of pressure oil from
Control valve 5 for supplying pressure oil to 1BC, arm hydraulic cylinder 31AC and work implement hydraulic actuator 31KC
The pipe connecting the hydraulic cylinder 31AC for the arm and the hydraulic actuator 31KC for the working tool to the control valve 54 is extended to the back of the boom 31B, and one end is connected to each of the hydraulic cylinder 31AC and the hydraulic actuator 31KC. The present invention is applied to a construction machine having at least four boom-side pipes LBA and LBK each having the other end connected to the control valve 54. The above object is achieved by employing the following configuration. That is, the left and right frames 38
A control valve 54 is disposed at one of the boom side front portions b and c, and the boom side pipes LBA and LBA of the arm hydraulic cylinder 31AC and the work implement hydraulic actuator 31KC are provided.
At the other end of the BK, four first main body side pipes LHA1, LHK
1 and the other ends of the four first main body side pipes LHA1 and LHK1 are connected to the main frame 38.
a to the connecting portions CA and CK provided at the vehicle rear position of the boom 31B, and the second main body side pipe LHA
2, one end of LHK2 is connected to the connection portions CA and CK, and the other end is connected to the control valve 54, and the arm hydraulic cylinder 31AC
And four second main body side pipes LHA2 and LHK2 corresponding to the work implement hydraulic actuator 31KC are provided between one of the main frame 38a and the left and right frames 38b and c where the control valve 54 is installed. It extends in the vehicle front-back direction along with the direction.

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a wheel shovel to which the present invention is applied, FIG. 2 is a front view, and FIG. 3 is a top view. As shown in the figure, the wheel shovel includes a lower traveling body 10 and a lower traveling body 10 via a turning device 20.
And an upper revolving body 30 rotatably connected to the upper part of the upper part.

As shown in FIGS. 1 and 2, the lower traveling body 10 includes a traveling hydraulic motor 61 and a hydraulic motor 61.
And a tire 65 that rotates through a propeller shaft 63 and an axle 64 (FIG. 2) that are driven to rotate by the output of the transmission 62 to drive a wheel-type hydraulic shovel.

The upper swing body 30 has a swing body frame 38 including a main frame 38a, a right frame 38b, and a left frame 38c. The revolving body frame 38 is provided with a work front attachment 31, a driving room 32 provided with a traveling operation member, a front attachment operation member, and the like, and an equipment room 33 covered with a cover 33K. The work front attachment 31
Boom 31 driven by boom hydraulic cylinder 31BC
B, an arm 31A driven by an arm hydraulic cylinder 31AC, and a bucket 31K driven by a bucket hydraulic cylinder 31KC. Each hydraulic cylinder is driven by controlling the flow of pressure oil from the hydraulic pump 52 by a control valve 54 described later.

As shown in FIG. 3, the equipment room 33 includes an engine 51 and a hydraulic pump 52 driven by the engine 51.
A radiator 53a for cooling engine cooling water, an oil cooler 53b for cooling hydraulic oil, and a hydraulic pump 5
A control valve 54 and the like for controlling the flow of the pressure oil from the fuel cell 2 are provided. The hydraulic pump 52 and the control valve 54 are connected by a delivery pipe (not shown) and a return pipe. Control valve 54
Is arranged on the side of the boom 31B in front of the right frame 38b, as shown in FIGS. That is, the control valve 54 is disposed on the right frame 38b on the vehicle front side with respect to the center of rotation of the boom 31B. The same applies to the case of disposing in the left frame 38c.

The control valve 54 is provided on the upper surface of a bracket 55 attached to the right frame 38b, and has at least a boom spool, an arm spool, and a bucket spool. A turning spool or running spool is also provided. Then, each spool of the control valve 54 is operated according to the operation of the operation member in the driver's seat, and the corresponding hydraulic cylinder and hydraulic motor are driven.

As shown in FIG. 1, a rubber hose GHK is connected to the bucket hydraulic cylinder 31KC, and the rubber hose GHK is connected to a boom-side pipe LBK disposed on the back of the boom 31B. A rubber hose GHA is connected to the arm hydraulic cylinder 31AC, and the rubber hose GHA is connected to a boom-side pipe LBA provided on the back surface of the boom 31B. Boom side piping LB
K and LBA are shown by solid lines in FIG.

In this embodiment, a case where a normal attachment 31 for excavation is mounted will be described.
A gutter attachment can also be used, and the boom-side piping LBT shown by a broken line in FIG. 3 is a piping for an offset cylinder used for the gutter attachment.

3 to 7, one end of each of four boom-side pipes LBK and LBA is connected to the control valve 54 by a main-body-side pipe. The main body side pipe is composed of first and second main body side pipes, respectively. That is, one end of the first main body side pipe LHK1 is connected to the other end of the bucket boom pipe LBK. The other end of the first main body side pipe LHK1 is connected to a connection block CK provided at a position behind the boom 31B on the main frame 38a. The connection block CK is fixed to the main frame 38a by a fixture. One end of the second main body side pipe LHK2 is connected to the connection block CK, and the other end is connected to the control valve 54. One end of a first main body side pipe LHA1 is connected to the other end of the arm boom pipe LBA. The other end of the first main body side pipe LHA1 is connected to the boom 3 on the main frame 38a.
1B is connected to a connection block CA provided at the rear position of the vehicle. The connection block CA is fixed to the main frame 38a by a fixture. Second body side piping LHA
One end of 2 is connected to the connection block CA, and the other end is connected to the control valve 54. In this embodiment, the first main body side pipes LHA1 and LHK1 are rubber hose pipes, and the second main body side pipes LHA2 and LHK2 are metal pipes.

As described above, even if the control valve 54 is provided at the front of the right frame 38b on the boom side due to a demand for space saving, the hydraulic cylinder 31AC,
The pipe connecting the 31KC and the control valve 54 is not exposed to the side surface of the boom, and there is no possibility that the pipe is damaged by stones or earth and sand from the side of the vehicle. Also, the appearance is improved.

As shown in FIG. 6, two second
Of the main body side pipe LHA2 and two second main body side pipes LHK2 for the bucket are provided in the gap between the main frame 38a and the right frame 38b in the vehicle front-rear direction.
And extend vertically along the side wall of the slab. Thus, when the control valve 54 is provided in the right frame 38b on the front side of the boom, the piping can be routed in a space-saving manner.

In FIGS. 4 to 7, the first and second main body side pipes LHT1 and LHT2 shown by two-dot chain lines are shown.
Can be routed in the same manner as described above. That is, one end of the two boom-side pipes LBT is connected to the control valve 5 by the first and second main-body-side pipes LHT1 and LHT2 for the gutter.
4 is connected. At the other end of the gutter boom pipe LBT,
One end of the first main body side pipe LHT1 is connected. The other end of the first main body side pipe LHT1 is connected to a connection block CT provided at a position behind the boom 31B on the main frame 38a. The connection block CT is fixed to the main frame 38a by a fixture. One end of the second main body side pipe LHT2 is connected to the connection block CT, and the other end is connected to the control valve 54. The first and second main body side pipes LHT1 and LHT2 are both rubber hose pipes.

In the above embodiment, the rubber pipe and the metal pipe are mixed in the main body side pipe, but the first and second pipes are used.
May be two rubber hoses. In this case, the other end of the first main body-side rubber hose having one end connected to the boom-side pipe is connected to the same connection block as in the first embodiment, and one end of the second main body-side rubber hose is connected to this connection block. And the other end is connected to the control valve 54.

As shown in FIGS. 8 and 9, the first and second main body side pipes for the gutter are connected to one rubber hose G.
It may be HT. In this case, one end is connected to the boom side pipe LB.
The other end of the main body-side rubber hose GHT connected to T is routed to a relay point CN at the rear of the vehicle, and this relay point CN
Clamp the middle point of the rubber hose with. Similarly, the arm main body side pipe and the bucket main body side pipe can be made of one rubber hose.

In addition to the conventional excavation attachment and gutter attachment shown in FIG. 1, attachments (work implements) such as a crusher and a breaker are mounted, and the excavator is driven by a work implement hydraulic actuator. The present invention can also be applied to the present invention.

[0021]

(1) As described in detail above, according to the present invention, when the control valve is provided at the front of the boom side of either the left or right frame, the boom extending from the back of the boom is provided. When connecting the side piping and the control valve, the main body side piping was once drawn to the vehicle rear side of the boom and then connected to the control valve, so the connection piping was not exposed on the side of the boom, and the piping was damaged. Is prevented, and the appearance of the boom is improved. (2) Since the four second main body side pipes are vertically arranged and routed as in claim 4, the boom side pipes and the control valve are connected even to a more space-saving vehicle body. The main body side piping can be once routed to the rear of the vehicle.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel type hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a top view showing details of the main body side piping of FIG. 1;

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a left side view of FIG. 4;

FIG. 7 is a rear view of FIG. 4;

FIG. 8 is a top view showing another example of the main body side piping in detail.

FIG. 9 is a right side view of FIG.

[Explanation of symbols]

10: Lower traveling structure 30: Upper revolving structure 31: Front attachment boom 31
B: Boom 31A: Arm 31K: Bucket 31BC, 31AC, 31KC: Hydraulic cylinder 38: Revolving frame 38a:
Main frames 38b, 38c: left and right frames 5
4: Control valve LBA, LBK, LBT: Boom side piping LHA1, LHK1, LHT1: First body side piping LHA2, LHK2, LHT2: Second body side piping CA, CK, CT: Connection block

Claims (4)

[Claims] 1. A main frame to which a front attachment having a boom is rotatably connected, a left and right frame disposed on the left and right sides of the main frame, and a flow of hydraulic oil from a hydraulic pump is controlled to control the front attachment. A control valve for supplying pressure oil to the actuator, a pipe connecting the front attachment actuator and the control valve extends to the back of the boom, and has one end connected to the front attachment actuator. In a construction machine having at least a boom-side pipe connected to the control valve at an end, the control valve is disposed at a boom-side front portion of one of the left and right frames, and the other end of the boom-side pipe is At the time of connection to the control valve, the other end of the main body side pipe having one end connected to the other end of the boom side pipe , Construction machine having a boom, characterized in that connected to the control valve from the lead to the relay point located rearwardly of said boom on said main frame. 2. A construction machine according to claim 1, wherein said main body side pipe is a single rubber hose, and an intermediate portion of said rubber hose is fixed at said relay point. 3. The construction machine according to claim 1, wherein the main body side pipe is composed of first and second main body side pipes, a connection portion is provided at the relay point, and one end of the first main body side pipe is provided. The other end of the boom-side pipe and the other end are connected to the connection part, respectively, and one end of the second main body-side pipe is connected to the connection part, and the other end is connected to the control valve. A construction machine having a boom. 4. A boom driven by a boom hydraulic cylinder, an arm driven by an arm hydraulic cylinder,
And a main frame to which a front attachment made of a working tool driven by a working tool hydraulic actuator is connected, left and right frames disposed on the left and right sides of the main frame, and controlling the flow of hydraulic oil from a hydraulic pump. A control valve for supplying hydraulic oil to the boom hydraulic cylinder, the arm hydraulic cylinder, and the working tool hydraulic actuator; and a pipeline connecting the arm hydraulic cylinder and the working tool hydraulic actuator to the control valve, A construction machine extending at the back of the boom and having at least four boom-side pipes, one end of which is connected to each of the hydraulic cylinder and the hydraulic actuator, and the other end of which is connected to the control valve. The control valve is disposed at a front portion on one side of the boom, and the arm hydraulic cylinder and One ends of four first main body side pipes are connected to the other ends of the four boom side pipes connected to the hydraulic actuator for work implement, respectively, and the four first main body side pipes are connected. The other ends of the pipes are respectively connected to connection portions provided on the main frame at a position rearward of the vehicle on the boom. One end of each of the four second body-side pipes is connected to the connection portion, and the other end is connected to the connection portion. Four second main body side pipes respectively connected to the control valve and corresponding to the arm hydraulic cylinder and the work implement hydraulic actuator are provided on the left and right frames where the main frame and the control valve are installed. A construction machine having a boom, which extends in the vehicle front-rear direction along any one of the gaps and vertically.