Ram cylinder control system for wheel type excavator

A control system, piston-type technology, applied in the direction of mechanically driven excavators/dredgers, earth movers/shovels, fluid pressure actuation system components, etc., can solve the trouble of locking or loosening piston cylinders Inconvenience and other issues

Active Publication Date: 2005-07-13
DOOSAN INFRACORE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, this conventional piston cylinder control system has a shortcoming in that the operator manually operates the piston cylinder lock switch according to the working or traveling state of the excavator so as to lock or release the piston cylinder according to the operator's wishes. inconvenient

Method used

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  • Ram cylinder control system for wheel type excavator
  • Ram cylinder control system for wheel type excavator
  • Ram cylinder control system for wheel type excavator

Examples

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Embodiment Construction

[0022] Preferred embodiments of the present invention are described below with reference to the accompanying drawings.

[0023] Referring first to FIG. 2 , it shows a diagram of the hydraulic transmission system of the piston cylinder control system of the wheel excavator according to the present invention. As shown in the figure, the piston cylinder control system of a wheel excavator includes a main hydraulic pump that provides hydraulic oil to various hydraulic actuators such as the mobile motor 1, an auxiliary hydraulic pump 20 that provides auxiliary pressure to the control valve, and an auxiliary hydraulic pump 20 that supplies hydraulic oil to various hydraulic actuators such as the mobile motor 1. A brake device 5 on the vehicle axle 4 supplies an auxiliary pump 30 of hydraulic pressure.

[0024] Hydraulic oil from the main hydraulic pump 10 is supplied to the travel motor 1 controlled by a plurality of control valves 12b, 12c including the travel control valve 12a, an...

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PUM

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Abstract

A piston cylinder control system for a wheeled hydraulic excavator, comprising: an auxiliary hydraulic pump; an auxiliary opening check valve locking the piston cylinder; a piston cylinder control valve adapted to respond to a valve control signal from an original The position is switched to the operating position to allow the hydraulic oil from the auxiliary hydraulic pump to open the check valve so that the hydraulic oil can be discharged from the piston cylinder; the brake pressure sensor is used to detect the hydraulic oil pressure supplied to the brake device; the joystick position detection controller for detecting the position of the joystick to generate one of a forward position signal, a rearward position signal and a neutral signal; and a controller, if a forward position signal or a rearward position signal is received and if the brake pressure If it is not greater than the set pressure, the controller applies the valve control signal to the piston cylinder control valve, if it receives a neutral signal and if the brake pressure exceeds the set pressure, the controller cuts off the application to the piston cylinder control valve valve control signal.

Description

technical field [0001] The present invention relates to a system for controlling a piston cylinder placed between a wheel axle and an upper bracket in a wheeled hydraulic excavator, and more particularly to a piston cylinder for a wheeled excavator that automatically locks or releases the piston cylinder according to the operating mode of the excavator. Cylinder control system. Background technique [0002] As is well known, a wheeled hydraulic excavator includes a piston cylinder placed between the wheel shaft and the upper bracket to attenuate the impact caused by the swing of the upper bracket with a large weight when the excavator travels, and also includes a The operating mode locks or loosens the control system of the piston cylinder. The piston cylinder control system is designed so that it releases the piston cylinder when the excavator travels, thereby avoiding the swing of the upper rotating body when the excavator encounters an irregular road surface during trave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F3/43E02F9/20E02F9/22F15B11/20F15B21/08
CPCE02F9/2207E02F9/2217E02F9/226E02F9/2292E02F9/2296E02F9/20
Inventor 李东在
Owner DOOSAN INFRACORE CO LTD
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