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Work machine

A technology of operating machinery and operating devices, which is applied in the direction of mechanical equipment, motor vehicles, and mechanically driven excavators/dredgers, etc. It can solve the problems of high flow rate and inability to ensure the position control accuracy of the actuator, and achieve the effect of accelerating the working speed

Active Publication Date: 2022-04-12
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the configuration where the return oil from the actuator is merged into the pump-side flow path, the flow rate supplied from the pump to the actuator is executed by setting the target flow rate of the actuator through mechanical control (or corresponding to the operator's lever operation). In the case of control matching the target flow rate, the flow rate supplied to the actuator is more than the target flow rate, and the position control accuracy of the actuator cannot be ensured.

Method used

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Experimental program
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Effect test

Embodiment 1

[0039] Figure 2A and Figure 2B It is a circuit diagram of the hydraulic drive device in the first embodiment of the present invention.

[0040] (1) Composition

[0041] The hydraulic driving device 400 in the first embodiment includes three main hydraulic pumps driven by an engine (not shown), for example, the first hydraulic pump 1, the second hydraulic pump 2 and the 3 hydraulic pump 3. In addition, a pilot pump 91 driven by the engine is provided, and a hydraulic oil tank 5 that supplies oil to the hydraulic pumps 1 to 3 and the pilot pump 91 is provided.

[0042] The tilt angle of the first hydraulic pump 1 is controlled by a regulator attached to the first hydraulic pump 1 . The regulator of the first hydraulic pump 1 includes a flow rate control command pressure port 1a, a first hydraulic pump self-pressure port 1b, and a second hydraulic pump self-pressure port 1c. The tilt angle of the second hydraulic pump 2 is controlled by a regulator attached to the second h...

Embodiment 2

[0108] Figure 8A and Figure 8B It is a circuit diagram of the hydraulic drive device in the second embodiment of the present invention.

[0109] (1) Composition

[0110] The configuration of the hydraulic drive device 400A in this embodiment is the same as that of the hydraulic drive device 400 ( Figure 2A and Figure 2B ) are substantially the same, but differ in the following respects.

[0111] A hydraulic drive device 400A in this embodiment includes check valves 101 to 109 for preventing backflow from the actuator side to the discharge lines 40, 50, and 60 instead of the auxiliary flow control valves 21 to 29 in the first embodiment.

[0112] The regeneration valve 35 in this embodiment is arranged inside the spool valve of the first arm directional control valve 11 , and the first arm directional control valve 11 is provided with regeneration ports 121 , 122 . The regeneration port 121 is connected to an oil passage 111 branched from the tank line 70 connected to ...

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Abstract

The invention provides a work machine which can ensure the position control precision of an actuator and can accelerate the operation speed of the actuator based on a regeneration function. The controller calculates a regeneration flow rate on the basis of an input amount of an operating lever and a target actuator flow rate, calculates a target actuator supply flow rate by subtracting the regeneration flow rate from the target actuator flow rate, and calculates a target flow rate control valve opening amount on the basis of the target actuator supply flow rate. A target pump flow rate equal to or greater than the sum of the target actuator supply flow rates is calculated, a switching valve is controlled on the basis of the input amount of the operating lever, a flow rate control valve is controlled in accordance with the target flow rate control valve opening amount, and a hydraulic pump is controlled in accordance with the target pump flow rate.

Description

technical field [0001] The present invention relates to working machines such as hydraulic excavators. Background technique [0002] Working machines such as hydraulic excavators have a body including a revolving body and a working device (front device) attached to the revolving body. The working device includes: a boom (front part) connected to the revolving body; Arm (front part); bucket (front part) connected to the front end of the arm; boom cylinder (actuator) that drives the boom; arm cylinder (actuator) that drives the arm; Bucket bucket cylinder (actuator). In such a work machine, when the boom, the arm, or the bucket is operated independently, the tip of the bucket forms an arc-shaped locus. Therefore, for example, in the case of forming a linear dressing surface at the tip of the bucket by pulling the arm, the operator needs to operate the boom, the arm, and the bucket in a complex manner, and the operator is required to have skilled operation skills. . [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F3/28E02F3/36E02F3/38E02F3/40E02F3/42E02F3/43
CPCF15B11/024E02F9/2296E02F9/2292E02F9/2282E02F9/2217E02F9/2235E02F3/437F15B2211/3116F15B2211/7135F15B2211/3058F15B2211/31558F15B2211/41509F15B2211/426F15B2211/428F15B2211/327F15B2211/665F15B2211/6652F15B2211/6654F15B13/0403F15B2211/6346F15B2211/6336F15B2211/455F15B21/087F15B2211/20546F15B2211/3133F15B2211/6309F15B2211/6313F15B2211/7053F15B2211/3144F15B2211/329F15B2211/351F15B2211/20576E02F9/2221E02F9/2004F15B11/042F15B11/08B60Y2200/412E02F9/2228E02F9/2285F15B13/02F15B2211/35F15B2211/40576
Inventor 熊谷贤人井村进也钓贺靖贵千叶孝昭天野裕昭西川真司楢崎昭广杉山玄六山本慎二郎
Owner NIHON KENKI CO LTD