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A bulldozer and its blade tilting control system

A technology for control systems and bulldozers, applied to earth movers/shovels, mechanical equipment, fluid pressure actuators, etc., can solve problems such as large torque, inability to expand and contract, fatigue fracture, etc.

Active Publication Date: 2015-08-12
SHANTUI CONSTR MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the shovel is lifted or lowered to the limit position, since the lifting cylinder has reached the limit stroke, it cannot be stretched. If the tilting operation is performed at this time, a large torque will be generated at the hinge of the lifting cylinder, which will cause the front machine The cover is deformed, and even fatigue fractures and other problems occur

Method used

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  • A bulldozer and its blade tilting control system
  • A bulldozer and its blade tilting control system
  • A bulldozer and its blade tilting control system

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Embodiment Construction

[0031] The core of the present invention is to provide a control system for tilting the blade of the bulldozer, which can avoid tilting operations when the lifting cylinder moves to the limit position, thereby avoiding excessive torque at the hinge of the lifting cylinder.

[0032] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Please refer to figure 1 , figure 1 It is a schematic diagram of the principle of the control system provided by the present invention in a specific implementation manner.

[0034] In a specific embodiment, the control system for bulldozer blade inclination of the present invention includes an oil tank 9, a hydraulic valve 6 and two lifting cylinders 1 arranged in parallel, and the oil inlet and the oil outlet of the hydraulic valve 6 are respectively co...

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Abstract

The invention provides a bulldozer and a shovel blade inclination control system of the bulldozer. The control system can avoid overlarge toque produced when lifting oil cylinders are located at the extremity position and a shovel blade inclines. The control system comprises an oil tank and two parallel lifting oil cylinders. The control system further comprises an oil controlled valve. An oil inlet and an oil outlet of the oil controlled valve are communicated with a rear cavity oil opening of the lifting oil cylinders and the oil tank respectively. When oil pressure of a rear cavity of the lifting oil cylinders reaches an index value, the oil controlled valve is located at the communication position. When the oil pressure of the rear cavity of the lifting oil cylinders is lower than the index value, the oil controlled valve is located at the disconnection position. When the oil pressure of the rear cavity of the lifting oil cylinders reaches the index value, the oil controlled valve communicates the rear cavity oil opening of the lifting oil cylinders with the oil tank, at the moment, the lifting oil cylinders stop moving and do not reach the extremity stroke, therefore, when the shovel blade inclines, the two lifting oil cylinders can freely contract, the overlarge torque is not produced at the hinged position of the two lifting oil cylinders, and the problems such as deformation of a front hood are also not generated.

Description

technical field [0001] The invention relates to the technical field of bulldozers, in particular to a control system for tilting blades of bulldozers. The invention also relates to a bulldozer with the above-mentioned control system. Background technique [0002] In the prior art, the hydraulic control system of the bulldozer mainly includes two lifting cylinders and one tilting cylinder. The lifting cylinder is mainly used to lift the blade, and the tilting cylinder is used to tilt the blade left and right. [0003] One end of the lifting cylinder is hinged on the blade, and the other end is hinged on the front hood of the bulldozer. When lifting the blade, the hydraulic oil is controlled to enter the oil from the front and rear chambers of the lifting cylinder respectively to complete the lifting of the blade. One end of the tilt cylinder is hinged on the blade, the other end is hinged on the push rod, and the left and right tilt of the blade is realized by pushing the pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F3/85F15B11/16
Inventor 徐刚孟凡旺石慧敏韩继斌栾兴伟季广科张一鹤薛子萱姜燕燕郝建领
Owner SHANTUI CONSTR MASCH CO LTD
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