JP2000129720A - Revolving working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a revolving working machine that the turning radius of the rear end of a revolving super structure is so small that sufficient space can be secured to inspect a selector valve, while providing a good side viewing field from a cab and easily replacing an attachment. SOLUTION: This revolving working machine comprises a base carrier 2 and a revolving super structure 3, and a support frame 30 to which a pin 10 supporting an attachment is freely removably journaled, a cab 8 located on one side of the support frame, an oil tank 17 located on the other side of the support frame, and a selector valve 11 controlling the flow of pressure oil are arranged on the bottom frame 20 of the revolving super structure. The height of the oil tank is lower than the journaled height of the pin throughout the oil tank and the selector valve is provided in a position above the oil tank where it does not cross the extending direction of the pin journaled to the support frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type work machine in which an upper swing body turns with respect to a lower traveling body.

[0002]

2. Description of the Related Art Crane trucks, power shovels, and the like used in construction work sites and the like are well known as revolving work machines in which an upper revolving structure turns with respect to a lower traveling structure. In particular, for narrow work in narrow streets in a city area, a small turning type work machine is used. In such a small turning type small work machine, various types of oil storage tanks such as a cab, an engine, a hydraulic oil tank (oil reservoir) and a fuel tank (fuel tank) are provided in a limited space on a frame of the upper turning body. Components are located.

FIGS. 4 and 5 show a small power shovel, which is an example of a swing type working machine. As shown in FIG. 4, the power shovel includes a lower traveling body 101 as a bogie, an upper revolving body 102 rotatably mounted on the lower traveling body 101, and a detachable detachable front part of the upper revolving body 102. And a front attachment 125 as an attached working device. A machine room 103 covered by a cover 121 is provided at a rear end of the upper swing body 102 on the bottom frame 120. Machine room 1
A counter weight 109 is mounted on the rear side of the counter 03.

[0004] A front attachment 125 is a boom 127 which is attached to the upper swing body 102 so as to be able to undulate.
And an arm 129 rotatably connected to the tip of the boom 127, and a bucket 132 tiltably attached to the tip of the arm 129. The boom 127 is moved up and down by a boom cylinder 128 </ b> A attached to the bottom frame 120 of the swing body 102. The arm 129 is rotated with respect to the boom 127 by an arm cylinder 128B attached to the tip of the boom 127. The bucket 132 is moved by the tilting cylinder 128C attached to the tip of the arm 129.
Tilted against.

FIG. 5 is a plan view of the upper swing body 102 with the cover 121 and the attachment 125 removed. As illustrated, an engine 104, a hydraulic pump 105 driven by the engine 104, and a radiator 106 are housed in the machine room 103.
A support frame 130 is provided at the front center of the bottom frame 120. The support frame 130 includes a pair of opposed plates 130A and 130B erected on the bottom frame 120. These plates 13
0A and 130B, the boom 1 of the attachment 125
A boom foot pin 110 that supports a base end (lower end) of the 27 so as to be able to undulate is supported in a detachable manner.

[0006] On the bottom frame 120, one side of the support frame 130, the operation of the attachment 125, the traveling of the lower traveling body 101, and the upper revolving body 10
Cab (driving operation room) 1 for performing turning operation 2 and the like
08 is installed. Also, the bottom frame 120
Above, a hydraulic oil tank (oil reservoir) 115 is disposed behind the cab 108. further,
The fuel tank (fuel tank) 10 is positioned on the other side of the support frame 130 on the bottom frame 120.
7 are arranged.

In FIG. 5, O is the center of rotation of the upper swing body 102, and this center of rotation O is located between the plates 130A and 130B of the support frame 130. In the vicinity of the turning center O (specifically, behind the turning center O), a turning motor 112 is provided in front of the engine 104. A direction switching valve 111 for controlling a hydraulic actuator is provided between the swing motor 112 and the engine 104.
Is installed.

A plurality of operation levers (not shown) for operating the direction switching valve 111 are provided in the cab 108. When these operating levers are operated, the hydraulic pump 1
The traveling oil of the lower traveling body 101 and the swing motor 1 of the upper
12 and the cylinders 128A to 128C.

[0009]

As described above, in the conventional power shovel shown in FIGS. 4 and 5, behind the turning center O, the turning motor 112, the direction switching valve 111, and the engine 104 are connected. Are sequentially arranged along the longitudinal direction of the upper swing body 102. Therefore, the upper revolving unit 102 protrudes long behind the turning center O, and the rear end turning radius R of the upper revolving unit 102 becomes large, which may hinder the turning operation in a narrow work site. When the direction switching valve 111 is disposed between the engine 104 and the turning motor 112, the direction switching valve 11
It is difficult to secure a space around the directional control valve 111 for the maintenance of the vehicle 1.

In the power shovel shown in FIGS. 4 and 5, the fuel tank 107 is arranged not on the rear side of the upper revolving unit 102 but on the side of the cab 108 so that the rear end turning radius R does not become large. . In addition, as shown in FIG.
10 extends above the height position at which it is pivotally supported, and is closely opposed to the boom foot pin 110. In this way, if the fuel tank 107 extends higher than the position where the boom foot pin 110 is attached to the side of the cab 108, not only does the visibility of the obliquely downward side from the cab 108 deteriorate,
When the attachment 125 is replaced due to a crack in the boom 127 or the like, the boom foot pin 110 cannot be easily pulled out to the side. That is, a space for pulling out the pin 110 by removing the fuel tank 107 from the upper swing body 102 or the like must be secured on the side of the pin 110. This operation is very complicated and involves a great deal of labor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. It is an object of the present invention to reduce a turning radius of a rear end of an upper revolving structure and to provide a sufficient space for inspection and maintenance of a directional control valve. It is an object of the present invention to provide a revolving working machine that can secure the same, has a good lateral view from a cab, and can easily replace an attachment.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an undercarriage and an upper revolving body which is removably mounted on the undercarriage and to which a work attachment is detachably attached. A support frame on which a support pin for supporting the attachment is removably supported, and a cab arranged on one side of the support frame. In a rotary working machine in which an oil storage tank arranged on the other side of the frame and a directional control valve for controlling the flow of pressurized oil are arranged, the height of the oil storage tank is adjusted by supporting pins throughout the oil storage tank. The directional control valve is set lower than the supported height position, and at least the adjustment portion of the directional control valve is located above the oil storage tank and does not cross the extending direction of the support pin supported by the support frame. And it is provided at a position.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a power shovel 1 as a swing-type working machine according to a first embodiment of the present invention. As shown in FIG. 1B, the power shovel 1 includes a lower traveling body 2 as a bogie and an upper revolving body 3 mounted on the lower traveling body 2 so as to be capable of turning. Although not shown, an attachment 125 as a working device as shown in FIG. 4 is detachably attached to a front portion of the upper swing body 3. In this case, a boom cylinder 128 </ b> A (see FIG. 4) that raises and lowers the boom 127 of the attachment 125 is attached to a bracket 40 formed on the bottom frame 20 of the upper swing body 3.

A machine room 4 covered by a cover 21 is provided at a rear end of the upper swing body 3 on the bottom frame 20. On the rear side of the machine room 4, there is a counterweight 9
Is installed.

FIG. 1A is a plan view of the upper swing body 3 with the cover 21 removed. As shown,
In the machine room 4, an engine 5, a hydraulic pump 6 driven by the engine 5, and a radiator 7 are accommodated. A support frame 30 is provided at a central portion on the front side of the bottom frame 20. The support frame 30 includes a pair of opposed plates 30A and 30B erected on the bottom frame 20. These plates 30A, 3
Each of the OBs is provided with a boss portion 45 located on a side of a cab 8 described later. These bosses 45
The boom foot pin 10 for supporting the base end (lower end) of the boom 127 of the attachment 125 so as to be able to undulate.
Are detachably supported.

In the figure, O is the center of rotation of the upper swing body 3, and this center of rotation O is the plate 30 of the support frame 30.
A and 30B. In the vicinity of the turning center O (specifically, behind the turning center O), a turning motor 12 is provided in front of the engine 5. On one side of the support frame 30, on the bottom frame 20,
A cab (driving operation room) 8 for operating the attachment 125, traveling the lower traveling body 2, turning the upper revolving body 3, and the like is provided. A hydraulic oil tank (oil reservoir) 15 is disposed on the bottom frame 20 behind the cab 8.

On the other side of the support frame 30, an L-shaped fuel tank (fuel tank) 17 is disposed on the bottom frame 20. The fuel tank 17 extends around the boom foot pin 10 located on the side of the cab 8. Further, the fuel tank 17 extends widely forward and laterally of the boom foot pin 10 close to the boom foot pin 10 in order to secure a sufficient capacity (that is, the front face of the fuel tank 17 is 10, and a part 39 thereof is dropped into the bottom frame 20.
The height of the fuel tank 17 is set lower than the mounting position of the boom foot pin 10 over the entire fuel tank 17. That is, the upper surface of the fuel tank 17 is lower than the height position at which the boom foot pin 10 is pivotally supported over the entire fuel tank 17.

Above the fuel tank 17, a direction switching valve 11 for controlling a hydraulic actuator is provided. In this case, the directional control valve 11 is installed on the mount member 60 erected on the bottom frame 20 and at a position where the side pull-out operation of the boom foot pin 10 at the time of replacing the attachment is not hindered (the position of the support frame 30). (A position that does not cross the direction in which the support pin 10 that is pivotally supported extends). A space of a predetermined size is provided below the mount member 60, and this space is used as a space for bending the piping.

A plurality of operation levers (not shown) for operating the direction switching valve 11 are provided in the cab 8. When these operating levers are operated, the hydraulic pump 6
Pressure oil is supplied to and discharged from the traveling motor of the lower traveling body 2, the slewing motor 12 of the upper slewing body 3 and the cylinders 128 </ b> A to 128 </ b> C via the direction switching valve 11 (see FIG. 4). In FIG. 1A, reference numeral 51 denotes an air cleaner.

As described above, in the power shovel 1 of the present embodiment, since the direction switching valve 11 is not disposed between the turning motor 12 and the engine 5, the engine 5 must be arranged closer to the turning motor 12. Can be. Therefore, since the upper swing body 3 does not need to protrude long behind the swing center O, the rear end swing radius R of the upper swing body 3 becomes smaller than before, and the swing work in a narrow work site becomes easy, and Efficiency is improved.

Further, in the power shovel 1 of the present embodiment, since the directional control valve 11 is installed above the fuel tank 17, the entire circumference of the directional control valve 11 is opened, so that the maintainability of the directional control valve 11 is improved. improves.

Further, in the power shovel 1 of the present embodiment, the fuel tank 17 extends around the boom foot pin 10 located on the side of the cab 8, and the entire fuel tank 17 extends from the position where the boom foot pin 10 is mounted. Is also low. Accordingly, the field of view from the cab 8 obliquely below the side is improved. The capacity that is reduced by lowering the height of the fuel tank 17 is such that the fuel tank 17 is extended close to the boom foot pin 10 and widely extends forward and laterally of the boom foot pin 10.
Since the fuel tank 17 is covered by dropping a part 39 of the fuel tank 17 into the bottom frame 20, the capacity of the fuel tank 17 can be secured to be equal to or larger than that of the conventional case.

In the power shovel 1 of the present embodiment, not only is the fuel tank 17 entirely lower than the mounting height of the boom foot pin 10 but also the direction switching valve 11 located above the fuel tank 17. Are also arranged at positions not facing the boom foot pin 10. Therefore, when replacing the attachment 125,
Even if the boom foot pin 10 is pulled out to the side, the boom foot pin 10 does not interfere with the fuel tank 17 and the direction switching valve 11. Therefore, the attachment 125
Can be easily exchanged.

In this embodiment, the directional control valve 1
Although the mount member 60 is located below 1 and the fuel tank 17 does not extend, the fuel tank 17 may extend to below the direction switching valve 11. That is, the direction switching valve 11 may be installed so as to overlap the fuel tank 17. In this case, the directional control valve 11
Since the space below the fuel tank 17 can be effectively used as a space for installing the fuel tank 17, a large capacity of the fuel tank 17 can be secured. Further, in the present embodiment, the entire directional control valve 11 is located above the fuel tank 17, but at least the adjusting portion of the directional control valve 11 is
7 may be located above. Further, in the present embodiment, the fuel tank 17 has been described as an example of the oil storage tank disposed on the side of the cab 8.
May be arranged on the side of the cab 8 in a similar manner.

FIG. 2 shows a second embodiment of the present invention. In the present embodiment, the fuel tank 17 is formed integrally with the bottom frame 20, and the entire fuel tank 17 is dropped into the bottom frame 20. That is, a part of the bottom frame 20 is formed as the fuel tank 17. The other configuration is the same as that of the first embodiment. Therefore, according to the present embodiment, the height of the fuel tank 17 can be reduced to improve the visibility obliquely below the cab 8 from the side, and the capacity of the fuel tank 17 can be further secured. Can also.

FIG. 3 shows a third embodiment of the present invention. In the present embodiment, the fuel tank 17 has a plurality of (two in this embodiment) tank sections 17A,
17B. Each tank part 17A, 17B
Are connected to each other by a connecting pipe 70 and are arranged in an L-shape. The other configuration is the same as that of the first embodiment.

As described above, a plurality of tank portions 1 having a simple shape are used.
If the fuel tanks 17A and 17B are arranged in a predetermined arrangement while being connected by the connecting pipe 70, the fuel tank 17 having a complicated shape can be easily manufactured, and the empty space on the bottom frame 20 can be reduced by the space for installing the fuel tank 17. As a result, the degree of freedom in installing components on the bottom frame 20 is increased.

It is needless to say that the present invention can be applied not only to a power shovel but also to other revolving working machines such as a crane truck.

[0030]

As described above, according to the all-turn type working machine of the present invention, the turning radius of the rear end of the upper turning body can be reduced, and a sufficient space for inspection and maintenance of the directional control valve can be secured. At the same time, the side view from the cab is good, and the attachment can be easily replaced.

[Brief description of the drawings]

FIG. 1A is a plan view of a power shovel according to a first embodiment of the present invention, and FIG. 1B is a side view of the power shovel of FIG.

FIG. 2 is a side view of a power shovel according to a second embodiment of the present invention.

FIG. 3A is a plan view of a power shovel according to a third embodiment of the present invention, and FIG. 3B is a side view of the power shovel of FIG.

FIG. 4 is a side view of a conventional power shovel.

FIG. 5 is a plan view of a conventional power shovel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Revolving work machine 2 ... Lower traveling body 3 ... Upper revolving body 8 ... Cab 10 ... Support pin 17 ... Fuel tank (oil storage tank) 20 ... Bottom frame 30 ... Support frame

Claims (1)

[Claims] An upper revolving body, comprising: a lower traveling body; and an upper revolving body which is pivotably mounted on the lower traveling body and to which a work attachment is removably attached, on a bottom frame forming a bottom of the upper revolving body. A support frame on which support pins for supporting the attachment are detachably supported, a cab arranged on one side of the support frame, an oil storage tank arranged on the other side of the support frame, and In the turning type work machine in which the directional control valve for controlling the flow is disposed, the height of the oil storage tank is set lower than the height position where the support pin is pivotally supported over the entire oil storage tank. Is a swing type working machine, characterized in that at least the adjustment portion is located above the oil storage tank and is provided at a position not to cross the extending direction of the support pin supported by the support frame.