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Nawy

A kind of excavator, variable technology, applied in the direction of earth mover/shovel, mechanically driven excavator/dredger, construction, etc., can solve the problems of poor response of variable throttle valve and unstable action of stick , to achieve the effect of stable movement

Active Publication Date: 2016-09-28
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the responsiveness of the variable throttle valve is poor, when the arm is dropped by its own weight, the opening area may frequently increase or decrease (swing) and the arm operation may become unstable.

Method used

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Examples

Experimental program
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Embodiment Construction

[0025] figure 1 It is a side view showing a shovel as a construction machine to which the present invention is applied. A revolving upper body 3 is mounted on an undercarriage 1 of the shovel via a slewing mechanism 2 . A boom 4 is attached to the upper revolving body 3 . An arm 5 is attached to the tip of the boom 4 , and a bucket 6 is attached to the tip of the arm 5 . Boom 4 , arm 5 , and bucket 6 as operating elements constitute a digging attachment as an example of attachments, and are hydraulically driven by boom cylinder 7 , arm cylinder 8 , and bucket cylinder 9 , respectively. A cab 10 is provided on the upper revolving structure 3 , and a power source such as an engine 11 and a controller 30 are mounted thereon.

[0026] The controller 30 is a control device that is a main control unit that performs driving control of the shovel. In this embodiment, the controller 30 is constituted by a computing processing device including a CPU (Central Processing Unit) and an ...

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PUM

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Abstract

The invention provides a nawy which can realize operation stabilization of an operation element when the operation element operates through self weight. The nawy is provided with a bucket rod (8), a regeneration relieving valve (75), and a unified bleed-off valve (56L). The bucket rod (8) is provided with a bottom side oil cavity which expands when a bucket rod (5) falls down through self weight, and a rod side oil cavity which contracts. The regeneration relieving valve (75) adjusts flow of operating oil from the rod side oil cavity to an operating oil tank (T). The unified bleed-off valve (56L) adjusts flow of operating oil towards the bottom side oil cavity.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2015-047662 filed on March 10, 2015. The entire contents of this Japanese application are incorporated herein by reference. [0002] The present invention relates to a shovel equipped with a variable throttle valve that restricts the flow rate of working oil flowing from a contraction side oil chamber of a hydraulic cylinder to a working oil tank when an operating element is dropped by its own weight. Background technique [0003] There is known a shovel equipped with a variable throttle valve that restricts the flow rate of operating oil flowing from the rod side oil chamber of the arm cylinder to the operating oil tank when the arm is closed by dropping the arm by its own weight. (Refer to Patent Document 1). [0004] In this shovel, when the arm is dropped and closed by its own weight, the opening area of ​​the variable throttle valve is reduced so that the falling speed doe...

Claims

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Application Information

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IPC IPC(8): E02F3/42E02F9/22
CPCE02F3/42E02F9/2203
Inventor 松崎英祐石山宽塚根浩一郎川岛宏治
Owner SUMITOMO HEAVY IND LTD