JPH0637087Y2 - Piping equipment for work tools of hydraulic excavators - Google Patents

Description

TECHNICAL FIELD The present invention relates to a piping device for a work tool mounted along a front attachment of a hydraulic excavator.

2. Description of the Related Art FIG. 5 is a side view of a hydraulic excavator. In the figure,
1 is a front attachment mounted on the front part of the hydraulic excavator, 2 is a boom of the front attachment 1,
3 is an arm, 4 is a bucket, 5 is a large flow pipe specially arranged for use by mounting a special work machine such as a crusher (not shown), 6 is an upstream side of the large flow pipe 5. It is a stop valve attached to. FIG. 6 is a perspective view showing the front attachment 8 to which the tilt bucket 7 is attached. 9 is a large flow pipe, 10 is a two-way select valve mounted on the upstream side of the large flow pipe 9, and 11 is a large flow pipe 9.
An oil pipe on the tip side, 12 is a blind plug at the tip of the oil pipe 11, 13 is a tilting bucket 7 tilting cylinder, and 14 is an oil pipe provided for the bucket tilting cylinder 13. FIG. 7 is a diagram showing the vicinity of the two-way select valve 10 as viewed from A of FIG. Since the hydraulic actuator attached to the front attachment 8 performs forward and reverse operations, its operating circuit pipes are arranged substantially symmetrically. Therefore, the description of the piping device will be given for the piping on one side. In FIG. 7, a is a proximal end side of the arm 3, b is a distal end side, 15 is a connecting block, and X and Y are flow path direction marks displayed on the select valve 10.

The prior art plumbing system is then extended with respect to FIG. In order to operate the bucket 4 mounted on the front end of the front attachment 1, standard hydraulic oil supply pipes (not shown) are installed in the front attachment 1 for various hydraulic actuators, and a special work machine such as a crusher is installed. A special large flow pipe 5 is arranged along the front attachment 1 for mounting and use. An upstream side of the large flow rate pipe 5 is connected to a control switching valve (not shown), and a stop valve 6 is provided on the downstream side.
Therefore, the stop valve 6 is closed when a special work tool such as a crusher is not attached.

When the tilting bucket 7 or the like is attached to the front end of the front attachment 8 as shown in FIGS. 6 and 7, a two-way select valve 10 is provided instead of the stop valve 6 in FIG. For example, when the bucket tilting cylinder 13 is operated without using a crusher, the select valve 10 is manually switched to the X position and a bucket tilting control switching valve (not shown) of the hydraulic excavator is operated. . In this case, a blind plug 12 is attached to the oil pipe 11 on the tip side of the large flow pipe 9.

Problems to be Solved by the Invention As work uses of hydraulic excavators are diversified, it becomes necessary to additionally install a hydraulic actuator for a special work machine equipped on a front attachment. As shown in FIG. 5, when only the large flow rate pipe 5 is specially arranged, the stop valve 6 is provided on the downstream side of the large flow rate pipe 5.
However, when it is necessary to provide two additional hydraulic actuators, a two-way select valve 10 is attached instead of the stop valve 6 as shown in FIGS. 6 and 7, for example. When two or more additional hydraulic actuators were installed, the multi-directional select valve was replaced. Therefore, the select valve used before the replacement is unnecessary, which is uneconomical, and the manufacturing cost of the select valve is expensive.

It is an object of the present invention to solve the above problems and provide an inexpensive piping device that does not use a select valve.

Means for solving the problems a. Connect a swivel joint member having multiple outlet ports to the downstream side port of the stop valve installed downstream of the large flow rate pipe. Moreover, oil pipes with blind plugs are attached to the plurality of outlet ports, respectively.

Action a. Since the swivel joint member having a plurality of outlet ports is connected to the downstream side port of the stop valve, the stop valve originally equipped only for the large flow pipe can be used as it is.

B. Since the oil pipes with blind plugs are attached to the multiple outlet ports of the swivel joint member respectively, the hydraulic actuator can be operated by connecting the hydraulic actuator and one of the oil pipes in accordance with the mounting of the additional hydraulic actuator. You can

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a piping device according to the present invention. In the figure, the same reference numerals are given to those using the same constituent elements as those in the prior art. 8'is a front attachment, 16 is a swivel joint, 17 is an oil pipe with a blind plug, and 18 is a blind plug of the oil pipe 17. FIG. 2 is a front view seen from B of FIG. FIG. 3 is a partially cutaway side view of the swing joint member 16 as viewed from C in FIG. Reference numeral 19 is an outer body of the swivel joint member 16, 20 is an inner tubular body, 21 is an inlet port of the swivel joint member 16, and 22, 23, 24 are outlet ports, respectively. Figure 4 shows
It is the figure seen from D of FIG.

Next, the configuration of the piping device according to the present invention will be described with reference to FIGS.
The figure will be described. In the downstream port (not shown) of the stop valve 6 installed on the downstream side of the large flow rate pipe 5,
The inlet port 21 side of the swivel joint member 16 having a plurality of outlet ports 22 ,. And, the oil pipes with blind plugs 11, 14, and
17 was installed and configured.

Next, the function and function of the piping device according to the present invention will be described. Since the swivel joint member 16 having a plurality of outlet ports 22 ,,, 24 is connected to the downstream side port of the stop valve 6, the stop valve 6 originally equipped only for the large flow pipe 5 is installed. Can be used as is.
In addition, multiple outlet ports 2 of swivel joint member 16
Oil pipes 11, 14 and 17 with blind plugs are attached to 2, to 24 respectively, so by connecting the hydraulic actuator and any of the above oil pipes 11, 14 and 17 in response to the installation of an additional hydraulic actuator. The hydraulic actuator can be operated.

Effect of the Invention As the work use of hydraulic excavators is diversified, it is necessary to additionally install a hydraulic actuator for a special work machine equipped on the front attachment. For example, when providing two additional hydraulic actuators, a two-way select valve was attached downstream of the large flow rate pipe. When two or more additional hydraulic actuators were installed, the multi-directional select valve was replaced. Therefore, the select valve used before the replacement is unnecessary, which is uneconomical and the manufacturing cost of the select valve is high.

However, in the piping device according to the present invention, a swivel joint member having a plurality of outlet ports is connected to the downstream side port of the stop valve already installed on the downstream side of the large flow rate pipe, and the plurality of outlet ports are connected to the downstream side port. Each was constructed by installing an oil pipe with a blind plug. Thus, the hydraulic actuator can be operated by connecting the hydraulic actuator to one of the blind plug-equipped oil pipes corresponding to the mounting of the additional hydraulic actuator.

Therefore, in the piping device according to the present invention, it is not necessary to install an expensive select valve, and the piping operation corresponding to the additional hydraulic actuator is facilitated, and the piping cost for the work tool of the hydraulic excavator can be reduced. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a piping device according to the present invention, and FIG.
1 is a front view seen from FIG. 1B, FIG. 3 is a partially cutaway side view of the swivel joint member seen from FIG. 1C, and FIG. 4 is a view seen from D of FIG. 5 is a side view of the hydraulic excavator, FIG. 6 is a perspective view showing a prior art front attachment having a tilting bucket attached thereto, and FIG. 7 is A in FIG.
It is a figure which shows the two-way select valve vicinity seen more. 1,8,8 '…… Front attachment 5,9 …… Pipe for large flow 6 …… Stop valve 10 …… Select valve 11,14,17 …… Oil pipe 12,18 …… Blind plug 16 …… Swivel joint member 22,23,24 …… Exit port

Claims (1)

[Scope of utility model registration request] 1. A hydraulic fluid supply pipe is provided for various hydraulic actuators for work tools mounted on the front end of the front attachment, and another large flow pipe is arranged along the front attachment. In a piping device in which the upstream side of the flow rate pipe is connected to a control switching valve, and a stop valve is provided on the downstream side of the large flow rate pipe,
A piping device for a work tool of a hydraulic excavator, characterized in that a swivel joint member having a plurality of outlet ports is connected to a downstream side port of the stop valve, and a blind plug is attached to each of the plurality of outlet ports. .