JP2002061232A - Piping construction for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify many piping lines for interposing an operation pattern switch valve to a pilot pipe line communicating between a pilot operation valve and an hydraulic switch valve but this is very troublesome because many pipes have to be revised for removing an operation pattern switch valve from a hydraulic backhoe to which one-end operation pattern switch valve has been arranged and also, in the production process at the factory, it is previously required to provide a plurality of kinds of pipes for every cases of arranging the operation pattern switch valves and the cases not arranging them, and this is not desired from the viewpoint of the parts management. SOLUTION: An oil passage intermediation means placed in the middle of the oil passage communicating the pilot operation valve and hydraulic switch valve block is provided, the oil passage intermediation means permits the selective attaching of the first oil passage intermediation means or a second oil passage intermediation means; when the first oil passage intermediation means or the second oil passage intermediation means is installed selectively, the hydraulic piping communicating the first oil passage intermediate means or the second oil passage intermediation means or the hydraulic switch valve block is all made the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pipe applied to a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art FIG. 8 is a hydraulic circuit diagram showing an oil passage switching means using a conventional operation pattern switching valve. In the figure, 1 is a swing motor, 2 is an arm cylinder, 3 is a boom cylinder, 4 is a bucket cylinder, 5 is a left pilot operated valve, 6 is a right pilot operated valve, 7 is a turning hydraulic switching valve, and 8 is an arm hydraulic pressure. A switching valve, 9 is a hydraulic switching valve for boom, 10 is a hydraulic switching valve for bucket, 11 is a hydraulic pump, 12 is an operation pattern switching valve, 13 is a left operating lever for operating a left pilot operating valve, and 14 is a right pilot operating valve. This is the right operation lever for operating.

In the state shown in the figure, the operation pattern switching valve 12 is at the position b. For example, when the left operation lever 13 is operated in the direction A, the pilot pressure derived from the left pilot operation valve 5 changes to the port R5 to port C5. To act on the pilot port of the arm hydraulic switching valve 8 to switch the arm hydraulic switching valve to the low position, thereby causing the arm cylinder 2 to contract.

Next, the operation pattern switching valve 12 is switched to the position c. Then, the port R5 communicates with the port C1, and the pilot pressure acts on the pilot port of the boom hydraulic switching valve 9, and the boom cylinder 3 is contracted.

[0005] For example, in a hydraulic excavator, an actuator operated by operating an operation lever is different depending on a manufacturer, and a desired operation pattern can be obtained by a hydraulic excavator of any manufacturer according to preference and familiarity of the operator. An operation pattern switching valve as shown in FIG.

As the operation pattern switching valve 12, a rotary type as shown in FIG. 9 is generally used. FIG.
In the operation pattern switching valve 12, the inner block 22 is rotated with respect to the casing block 21 by rotating the lever 20, and the oil path between the input and output ports is switched by rearranging the oil paths formed between each other. be able to.

[0007]

However, this type of operation pattern switching valve is not always necessary. Differences in operation patterns for each manufacturer can cause confusion, so in recent years a uniform pattern has been set by international standards,
For example, in Europe, almost all hydraulic excavators adopt this uniform pattern.

For this reason, it is necessary to provide the operation pattern switching valve for a hydraulic excavator that does not need to change the operation pattern, since the operation pattern switching valve has a complicated structure and is expensive. It is desirable to provide this operation pattern switching valve according to the following. However, since the operation pattern switching valve is interposed in the pilot pipe which communicates the pilot operation valve and the hydraulic switching valve, in order to remove the operation pattern switching valve from the hydraulic shovel in which the operation pattern switching valve is provided, Many pipes need to be changed, which is very complicated. Further, in a production process in a factory, it is necessary to prepare a plurality of types of pipes for each of a case where the operation pattern switching valve is provided and a case where the operation pattern switching valve is not provided, which is not preferable from the viewpoint of parts management.

[0009]

According to the first aspect of the present invention, there is provided an operating means, and a pilot operating valve for operating the operating means to derive a plurality of operating pilot pressures corresponding to the operation of the operating means. A construction machine having a hydraulic switching valve block composed of a plurality of hydraulic switching valves which are respectively switched by a plurality of operating pilot pressures derived from the pilot operating valve, wherein a hydraulic fluid communicating between the pilot operating valve and the hydraulic switching valve block is provided. An oil path intermediation means disposed in the middle of the path, wherein the oil path intermediation means is capable of selectively attaching the first oil path intermediation means or the second oil path intermediation means; Alternatively, when the second oil passage intermediating means is selectively attached, the same hydraulic piping is used for communicating the first oil passage intermediating means or the second oil passage intermediating means with the hydraulic switching valve block.

[0010] According to this, an oil passage mediating means is interposed between the pilot operation valve and the hydraulic switching valve block, and a plurality of types of the oil passage mediating means are prepared and selectively mountable. Since the same hydraulic piping communicates with the intermediary means and the hydraulic switching valve block, the intermediary of the oil path intermediary means having a different function allows the different function by selectively attaching the oil path intermediary means. Can be provided, and necessary functions can be provided only when necessary, so that unnecessary costs are not generated. Further, the use of the same hydraulic piping facilitates parts management in the production process.

Further, according to the second aspect of the invention, the piping port of the first oil passage mediating means and the piping port of the second oil passage mediating means are attached in substantially the same direction. The connection can be made smoothly without changing the layout of the connected hydraulic piping.

According to the third aspect of the present invention, the first oil passage mediating means can change a combination of a pilot pressure deriving port of the pilot operating valve and a pilot pressure introducing port of the hydraulic switching valve. An operation pattern switching valve, wherein the second oil passage intermediary means is a port block in which an oil passage is opened, so that it is mounted only when an expensive operation pattern switching valve having a complicated structure is required, and a similar piping configuration is used. In this case, an inexpensive port block is attached when the operation pattern switching valve is unnecessary, so that the cost can be further minimized while achieving the same hydraulic piping.

According to a fourth aspect of the present invention, a hydraulic pipe connecting the pilot operation valve to the first oil passage intermediary means, and a hydraulic pipe connecting the pilot operation valve to the second oil path intermediation means. Are the same, so that parts management in the production process can be further facilitated.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a hydraulic shovel as one embodiment of a construction machine to which the present invention is applied. In the figure, 50 is a hydraulic excavator, 51 is a lower traveling structure, 52 is an upper revolving structure, 53 is a cab forming a cab, 55 is a work attachment, 56, 57, 58 are booms, arms, Bucket, 59
Is a boom cylinder for raising and lowering the boom 56 with respect to the upper swing body 52;
Is a bucket cylinder that swings the bucket 58 back and forth with respect to the arm 57, and 62 is a traveling motor.

According to this type of hydraulic excavator, the traveling body 62 is moved by the traveling motor 62 of the lower traveling body 51, and the upper revolving body 52 pivots with respect to the lower traveling body by a pivoting motor (not shown). The work attachment 55 is operated by the arm cylinder 60 and the bucket cylinder 61 to perform work such as excavation.

FIG. 2 is a plan view showing a layout on an upper frame constituting the upper swing body 52 of the excavator 50 of FIG. In the figure, 70 is an upper frame (indicated by phantom lines), 71 is a deck portion on which the cab 53 is placed, 72
Is a boom bracket that pivotally supports the boom 56; 73 is a boom cylinder bracket that pivotally supports the boom cylinder 59;
75 is a hydraulic switching valve block, 76 is an operation pattern switching valve as first oil passage mediating means, 77 is an operation pattern switching valve 7
A pilot pipe for communicating an oil passage between the pilot port 6 and the hydraulic switching valve 75 (not shown), a switching lever 78 for switching the operation pattern switching valve 76, and an input port 79 for the operation pattern switching valve.

FIG. 3 is a view showing the cab in the cab 53 of the hydraulic excavator 50 shown in FIG. In the drawing, reference numeral 80 denotes a driver's seat, 81 denotes a control box, 82 denotes a pilot operation valve disposed in the control box, 83 denotes an operation lever, 84 denotes a pilot operation valve for traveling, 85 denotes a traveling lever, and 86 denotes a floor plate.

FIG. 4 is a view showing the operation pattern switching valve 76. In the figure, reference numeral 91 denotes a support bracket, and 92 denotes an output port.

FIG. 5 shows a state in which the port block 95 as the second intermediate means is attached in place of the operation pattern switching valve 76 as the first oil path intermediate means. FIG. 4 is a plan view showing a layout on an upper frame 70 that constitutes the first embodiment. 6 is a diagram showing a port block. In the drawing, reference numeral 96 denotes an input port, 97 denotes an output port, 98 denotes a pressure sensor, and 99 denotes a bracket. FIG. 7 is a diagram of FIG. 6 viewed from the direction B.

The configuration and operation of an embodiment of the present invention will be described with reference to FIGS.

First, a configuration in the case where the operation pattern switching valve 76 is required will be described with reference to FIGS. In the present embodiment, the boom cylinder 59 and the arm cylinder 6
0, a hydraulic switching valve block including hydraulic switching valves for the bucket cylinder 61, the traveling motor 62, and a swing motor (not shown) is mounted on the right side on the upper frame 70, and the cab 53 in the cab 53 on the left deck 71. An operation pattern switching valve 76 is suspended by a bracket 91 on a floor plate 86 in the cab.

A plurality of output ports of the pilot operation valve 82 and a plurality of input ports 79 of the operation pattern switching valve 76 are respectively connected by a pilot pipe (not shown). Further, a plurality of output ports 92 of the operation pattern switching valve are provided.
Are respectively connected to the plurality of pilot ports of the hydraulic switching valve block 75. As a result, when the operation lever 83 is operated, a pilot pressure acts on the pilot port of the hydraulic switching valve which is communicated, and a desired hydraulic actuator such as the boom cylinder 59, the arm cylinder 60, the bucket cylinder 61, and the traveling motor 62 is operated. be able to. Here, the operation pattern switching valve 76 is switched to the switching lever 78.
When the oil path is switched by operating the
It is possible to change the hydraulic actuator that operates in response to the operation of (1). These have the same configuration as the conventional operation pattern switching valve and hydraulic circuit shown in FIGS. 8 and 9.

As shown in FIG. 4, most of the plurality of output ports 92 of the operation pattern switching valve 76 are set so as to face the direction A, and the hydraulic switching valve block 75 is smoothly moved.
The pilot pipe 77 can be led out toward.

Next, a configuration in a case where the operation pattern switching valve 76 is not required will be described. A description will be given based on FIGS. When the operation pattern switching valve 76 is not required, the bracket 91 in FIG. 4 is not attached to the floor plate 86, but a bracket 99 is attached instead. The port block 95 is fixed to the bracket 99. The port block 95 has an oil passage formed such that the input port 96 and the output port 97 communicate with each other on a one-to-one basis. The port block 95 is also provided with a port for mounting a pressure sensor 98, so that a necessary pilot pressure can be detected as required. The input port 96 is connected to the pilot operation valve 82, and the output port 97 is connected to the hydraulic switching valve block 75.

Here, the port block 95 is suspended by a bracket 99 so that the output port 97 is directed in the direction A similarly to the output port 92 of the operation pattern switching valve 76. By directing the operation pattern switching valve 76 and the output port of the port block 95 in the same direction in this way, it is not necessary to change the routing of the pilot pipe 77, so that the pipe length and the fixing of the pilot pipe 77 on the upper frame 70 are eliminated. There is no need to change the position, and therefore the same pilot pipe 77 can be used.

The pilot pipe connecting the pilot control valve 82 to the input port 79 of the operation pattern switching valve 76 and the pilot pipe connecting the pilot control valve 82 to the input port 96 of the port block 95 are also the same. Thereby, common use of piping can be further promoted, and parts management in the production process can be facilitated.

According to this embodiment, the operation pattern switching valve 76 and the port block 95 are suspended from the floor plate 86. However, the operation pattern switching valve 76 and the port block 95 are fixed on the upper frame 70. It may be.

[0028]

According to the present invention, oil path mediating means is interposed between the pilot control valve and the hydraulic switching valve block, and a plurality of types of oil path mediating means are prepared and selectively mountable. Since the same hydraulic piping communicates the oil passage intermediating means and the hydraulic switching valve block, the oil passage intermediating means having different functions is interposed, so that the oil path intermediating means can be selectively mounted. Since different functions can be provided and necessary functions can be provided only when necessary, unnecessary costs are not generated. Furthermore, by making the hydraulic piping the same,
Parts management in the production process becomes easier.

Further, according to the second aspect of the present invention, the piping port of the first oil passage mediating means and the piping port of the second oil passage mediating means are attached in substantially the same direction. The connection can be made smoothly without changing the layout of the connected hydraulic piping.

Further, according to the third aspect of the present invention, an expensive operation pattern switching valve having a complicated structure is mounted only when necessary, and an inexpensive port block is connected to the operation pattern switching valve while using the same piping configuration. Is mounted when unnecessary, so that the cost can be further minimized while achieving the same hydraulic piping.

According to a fourth aspect of the present invention, a hydraulic pipe for communicating the pilot operation valve with the first oil passage intermediating means, and a hydraulic pipe for communicating the pilot operation valve with the second oil passage intermediary means are provided. Are the same, so that parts management in the production process can be further facilitated.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel as an embodiment of a construction machine to which the present invention is applied.

FIG. 2 is a plan view showing a layout on an upper frame constituting an upper revolving structure of the excavator 50 of FIG.

FIG. 3 is a view showing a cab in a cab of the hydraulic shovel of FIG. 1;

FIG. 4 is a view showing the operation pattern switching valve of FIG. 2;

5 is a view showing a state in which a port block as a second intermediary means is mounted in place of the operation pattern switching valve as the first oil path intermediary means, on an upper frame constituting the upper revolving structure of the hydraulic shovel of FIG. 1; It is a top view showing a layout.

FIG. 6 is a diagram showing a port block.

FIG. 7 is a view of FIG. 6 viewed from a direction B.

FIG. 8 is a hydraulic circuit diagram showing an oil passage switching means using an operation pattern switching valve according to a conventional technique.

FIG. 9 is a view showing an operation pattern switching valve.

[Explanation of symbols]

 12, 76 Operation pattern switching valve 75 Hydraulic switching valve block 82 Pilot operation valve 95 Port block

Claims (4)

[Claims] An operating means, a pilot operating valve for deriving a plurality of operating pilot pressures corresponding to an operation of the operating means by operating the operating means, and a plurality of operating pilot pressures derived from the pilot operating valve A hydraulic switching valve block comprising a plurality of hydraulic switching valves, each of which is switched by a hydraulic switching valve block, the hydraulic switching valve block having an oil passage mediating means disposed in the middle of an oil passage communicating the pilot operation valve and the hydraulic switching valve block. The oil passage intermediation means can selectively attach the first oil passage intermediation means or the second oil passage intermediation means, and selectively attaches the first oil passage intermediation means or the second oil passage intermediation means. A piping structure for a construction machine, wherein the first hydraulic passage intermediate means or the second hydraulic passage intermediate means and the hydraulic switching valve block have the same hydraulic piping. 2. A piping port of the first oil passage mediating means,
The piping port of the second oil passage mediating means is attached in substantially the same direction.
A piping structure for a construction machine according to the above. 3. The operation pattern switching valve which is capable of changing a combination of a pilot pressure deriving port of the pilot operation valve and a pilot pressure introduction port of the hydraulic pressure switching valve. 3. The piping structure for a construction machine according to claim 1, wherein the second oil passage mediating means is a port block in which the oil passage is opened. 4. 4. A hydraulic pipe communicating the pilot operation valve and the first oil passage intermediation means, and a hydraulic pipe communicating the pilot operation valve and the second oil passage intermediation means are identical. The piping structure of a construction machine according to any one of claims 1 to 3, wherein