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Hydraulic circuits for construction machinery

A hydraulic circuit and construction machinery technology, applied in the field of hydraulic circuits, can solve problems such as inability to return fluid inflow, and achieve the effect of increasing pressure and high pressure

Active Publication Date: 2017-03-29
NABLESCO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, even if the regeneration circuit is communicated with another control system using a logic valve at the time of regeneration, when the pressure of the fluid flowing through the other control system is high, the return fluid cannot sufficiently flow into the other control system.

Method used

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  • Hydraulic circuits for construction machinery
  • Hydraulic circuits for construction machinery
  • Hydraulic circuits for construction machinery

Examples

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Effect test

no. 1 Embodiment approach

[0021] The circuit structure of the hydraulic circuit

[0022] refer to figure 1 , the hydraulic circuit 100 of the hydraulic excavator according to the first embodiment of the present invention will be described. The hydraulic circuit 100 is a hydraulic circuit including a plurality of switching valves 5 , 6 arranged in series in an unload passage 21 connected to the hydraulic pump 1 .

[0023] Here, the hydraulic excavator (not shown) is equipped with the following accessories: boom 12, which is attached to the front part of the main body frame of the hydraulic excavator; arm, which is attached to the top end of the boom 12; It is mounted on the top end of the arm. For a generally known structure of a hydraulic excavator, Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-120604 ) can be referred to as needed.

[0024] Here, the boom 12 is operated by the two boom cylinders 3 and 4 . The boom cylinders 3 and 4 are arranged on both sides of the boom 12 in ...

no. 2 Embodiment approach

[0062] refer to Figure 6 The hydraulic circuit 105 of the second embodiment will be described.

[0063] First, compared to figure 1 In the hydraulic circuit 100 shown, the structures of the rod-side passage 23 and the head-side passage 24 of the hydraulic circuit 105 of this embodiment are the same as figure 1 The hydraulic circuit 100 shown is slightly different. In this embodiment, the rod-side passage 23 extending from the reversing valve 6 for the automatic arm is first connected to the rod-side chamber 4 b of the second boom cylinder 4 , and then extends from the rod-side chamber 4 b to connect to the first boom cylinder 3 . The rod side chamber 3b is connected. That is, the rod side chamber 3 b and the rod side chamber 4 b are connected in series on the rod side passage 23 .

[0064] The same applies to the head-side passage 24 . The head-side passage 24 extending from the switching valve 6 for the robot first connects to the head-side chamber 4 a of the second b...

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Abstract

The invention aims to provide a hydraulic circuit for construction machines comprising a circuit structure capable of increasing the pressure of regenerated hydraulic oil. Movable arm hydraulic cylinders (3, 4) and a movable arm (12) are arranged in a parallel. When the movable arm used for supplying hydraulic oil to rod side chambers (3b, 4b) of the movable arm hydraulic cylinders (3, 4) descends, a head side chamber (4a) of the second movable arm hydraulic cylinder (4) is connected to a container channel (26). When the movable arm descends, a stop valve (7) is switched to a cutoff position (7b) for preventing the hydraulic oil from moving from a head side chamber (3a) of the first movable arm hydraulic cylinder (3) to the head side chamber (4a) of the second movable arm hydraulic cylinder (4), and a regeneration valve (8) is switched to a communication position (8a) allowing the hydraulic oil to flow to a regeneration channel (25). The circuit structure of the hydralic circuit (100) is configured to fulfill the movements.

Description

technical field [0001] The invention relates to a hydraulic circuit for engineering machinery such as a hydraulic excavator. Background technique [0002] As a hydraulic circuit for a construction machine having a circuit structure using regenerative hydraulic oil (regenerative hydraulic oil) generated from one actuator (cylinder), there is a hydraulic circuit described in Patent Document 1, for example. The fluid pressure circuit described in Patent Document 1 includes a regeneration circuit through which return fluid flowing out of one chamber of the boom cylinder flows to the other chamber of the boom cylinder. In addition, this fluid pressure circuit has a valve called a logic valve for extending the regeneration function of the regeneration circuit to other control systems. This logic valve can communicate the above-mentioned regeneration circuit with other control systems during regeneration. Thereby, the regenerative fluid generated from one actuator (cylinder) can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/024F15B11/00
CPCE02F9/22E02F9/2267F15B11/16F15B2011/0246E02F9/2225E02F9/2282
Inventor 岩崎仁
Owner NABLESCO CORP