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Safety device for hydraulic working machine

A technology for working machines and safety devices, which is applied in the directions of fluid pressure actuation device, fluid pressure actuation system safety, and mechanical equipment, etc., can solve problems such as cost increase, and achieve the effect of saving quantity and reducing cost.

Active Publication Date: 2010-01-06
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the device described in the aforementioned Patent Document 1, since each pilot pressure acting on the control valve is detected by a pressure sensor, a plurality of sensors are required, resulting in an increase in cost.

Method used

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  • Safety device for hydraulic working machine
  • Safety device for hydraulic working machine
  • Safety device for hydraulic working machine

Examples

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Embodiment Construction

[0023] Below, refer to Figure 1 to Figure 10 Embodiments of the safety device for a hydraulic working machine according to the present invention will be described.

[0024] figure 1 It is an external side view of a crusher as an example of a hydraulic working machine to which the safety device according to this embodiment is applied. The crusher is based on a hydraulic excavator, and has: a traveling body 1, a rotating body 2 rotatably provided on the traveling body 1, and a boom rotatably provided on the rotating body 2. 3. An arm 4 rotatably provided at the front end of the boom, and a crusher attachment 5 rotatably provided at the front end of the arm. A scraper 6 is installed as an option on the running body 1 . In addition, in the hydraulic excavator of the standard specification, a bucket is attached instead of the attachment 5 .

[0025] The boom 3 is rotatably supported by the arm cylinder 11 in the vertical direction, the arm 4 is rotatably supported by the arm c...

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PUM

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Abstract

A safety device for a hydraulic working machine having control valves (22-24)for controlling flows of pressurized oil from a hydraulic pressure source (21) to hydraulic actuators (15-17), electric lever devices (51-53) for outputting operation signals (v51-v53) according to lever operation, electromagnetic proportional valves (25-30) for outputting control pressures for controlling the control valves (22-24), a pressure calculation section (50) for calculating control pressures (P25-P30) according to the operation signals (v51-v53), a control section (50) for controlling the electromagnetic proportional valves (25-30) so that control pressures outputted from the electromagnetic proportional valves (25-30) are the calculated control pressures (P25-P30), high-pressure selection circuits (41-44) for selecting a high-pressure side pressure of the control pressures outputted from the electromagnetic proportional valves (25-30), pressure detectors (45, 46) for detecting the control pressure selected by the high-pressure selection circuits (41-44), an abnormality determination section (50) for determining an abnormality of the electromagnetic proportional valves (25-30) based on the control pressure detected by the pressure detectors (45, 46) and on the control pressure calculated by the pressure calculation section, and prohibition devices (47, 48) for prohibiting control operation of the control valves (22-24) when it is determined that there is an abnormality in the electromagnetic proportional valves (25-30).

Description

technical field [0001] The invention relates to safety devices for hydraulic working machines operated by electric control levers. Background technique [0002] Conventionally, there is known a device that drives an electromagnetic proportional valve according to the operation amount of an electric control lever, and applies a pilot pressure generated by driving the electromagnetic proportional valve to a control valve to drive a hydraulic actuator (for example, refer to Patent Document 1). In the device described in this patent document 1, the pilot pressure acting on the control valve is detected by the pressure sensor, and the control pressure corresponding to the operation amount of the electric control lever is calculated, and the pressure detection value is compared with the control pressure to determine the electromagnetic proportionality. Abnormality of the valve. When it is judged that the electromagnetic proportional valve is abnormal, the driving of the hydraulic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B20/00E02F9/24E02F9/20F15B11/08F15B11/16
CPCE02F9/2285E02F9/226F15B20/002F15B20/008F15B19/005F15B2211/327F15B2211/329F15B2211/355F15B2211/36F15B2211/50518F15B2211/50536F15B2211/50554F15B2211/55F15B2211/575F15B2211/6316F15B2211/6346F15B2211/6355F15B2211/67F15B2211/855F15B2211/857F15B2211/8636F15B2211/87F15B20/00E02F9/24E02F9/20F15B11/08
Inventor 佐竹英敏小高克明后藤勇树长岛祐二一村和弘
Owner NIHON KENKI CO LTD
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