JPS6212658U

JPS6212658U -

Info

Publication number: JPS6212658U
Application number: JP1985100439U
Authority: JP
Priority date: 1985-07-03
Filing date: 1985-07-03
Publication date: 1987-01-26

Description

[Brief explanation of the drawing]

第１図および第２図は本考案の掘削機の油圧回
路の一実施例を示す説明図で、第１図はアームシ
リンダを駆動する油圧回路の要部を示す回路図、
第２図はバケツトシリンダを駆動する油圧回路の
要部を示す回路図、第３図は掘削機の一例として
挙げたローデイングシヨベルの側面図、第４図お
よび第５図はそれぞれ第３図に示すローデイング
シヨベルの回路図で、第４図はアームシリンダを
駆動する油圧回路の要部を示す回路図、第５図は
バケツトシリンダを駆動する油圧回路の要部を示
す回路図、第６図は掘削姿勢を示すローデイング
シヨベルの側面図、第７図はバケツトダンプ姿勢
を示すローデイングシヨベルの側面図である。３……アーム、４……バケツト、６……アーム
シリンダ、７……バケツトシリンダ、８，１９…
…油圧ポンプ、１１ａ，１１ｂ，１１ｃ，１１ｄ
……主管路、１２ａ，１２ｂ，２１ａ，２１ｂ，
２５ａ，２５ｂ……管路、１３……第１の切換弁
、１４，２２……パイロツト管路、１５……ペダ
ル（操作部）、１６，２３……油圧シリンダ、１
７……第２の切換弁、２０……手動絞り弁。 1 and 2 are explanatory diagrams showing one embodiment of the hydraulic circuit of the excavator of the present invention, and FIG. 1 is a circuit diagram showing the main parts of the hydraulic circuit that drives the arm cylinder,
Fig. 2 is a circuit diagram showing the main parts of the hydraulic circuit that drives the bucket cylinder, Fig. 3 is a side view of a loading shovel taken as an example of an excavator, and Figs. These are the circuit diagrams of the loading shovel shown in the figure. Figure 4 is a circuit diagram showing the main parts of the hydraulic circuit that drives the arm cylinder, and Figure 5 is a circuit diagram showing the main parts of the hydraulic circuit that drives the bucket cylinder. , FIG. 6 is a side view of the loading shovel showing the digging position, and FIG. 7 is a side view of the loading shovel showing the bucket dumping position. 3... Arm, 4... Bucket, 6... Arm cylinder, 7... Bucket cylinder, 8, 19...
...Hydraulic pump, 11a, 11b, 11c, 11d
...Main pipeline, 12a, 12b, 21a, 21b,
25a, 25b... Pipe line, 13... First switching valve, 14, 22... Pilot pipe line, 15... Pedal (operation unit), 16, 23... Hydraulic cylinder, 1
7...Second switching valve, 20...Manual throttle valve.

Claims

[Scope of Claim for Utility Model Registration] 1. In a hydraulic circuit provided in an excavator in which a front attachment moves between an excavation position and a bucket dumping position, and having an arm cylinder and a bucket cylinder, the front attachment When the arm cylinder moves from the bucket dumping position to the excavation position, a first switch is configured to connect both the bottom side and the rod side of the arm cylinder, and to connect both the bottom side and the rod side with the tank. A hydraulic circuit for an excavator, comprising a switching valve, a second switching valve that is switched to extend the bucket cylinder, and an operating section that switches the first switching valve and the second switching valve. 2. The hydraulic circuit for an excavator according to claim 1, wherein the operating portion is a pedal that simultaneously switches the first switching valve and the second switching valve.