Excavator walking automatic speed regulating system and excavator

A technology for automatic speed regulation and excavators, which is applied to earth movers/excavators, construction, etc., can solve problems that are difficult to achieve, and achieve the effect of reducing driving requirements

Active Publication Date: 2017-09-19
XCMG EXCAVATOR MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is relatively difficult to achieve in practice

Method used

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  • Excavator walking automatic speed regulating system and excavator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 As shown, an excavator includes a left travel motor 1, a right travel motor, a hydraulic pump for pumping oil to the left and right travel motors, and a travel automatic speed regulation system.

[0021] The walking automatic speed regulation system includes a first valve group 2, a second valve group, a shuttle valve 3, a pressure reducing valve 4 and a hydraulic control reversing valve 5.

[0022] The first valve group 2 includes: a first valve body with an oil port A, an oil port B and an oil port S, and two first one-way overflow valves arranged in the first valve body.

[0023] The second valve group includes: a second valve body with an oil port a, an oil port b and an oil port s, and two second one-way overflow valves arranged in the second valve body. Since the structure of the second valve group is the same as that of the first valve group 2, it is not shown in the drawings.

[0024] The oil inlets of the two first one-way relief valves are r...

Embodiment 2

[0033] The difference from the first embodiment is that in this embodiment, the oil port S and the oil port s are respectively connected to the oil inlet port of the pressure reducing valve 4 through a one-way valve.

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PUM

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Abstract

The invention discloses an excavator walking automatic speed regulating system and an excavator. The excavator walking automatic speed regulating system comprises a first valve bank, a reducing valve and a hydraulic control reversing valve, wherein the first valve bank comprises a first valve body and two first one-way overflow valves arranged in the first valve body; the oil inlets of the two first one-way overflow valves are separately connected with an oil port A and an oil port B, and the oil outlets of the two first one-way overflow valves are connected with an oil port S; the oil port S is connected with the oil inlet of the reducing valve; when hydraulic oil is conveyed from the oil inlets of the first one-way overflow valves to the oil outlets, the first one-way overflow valves have a one-way conduction effect, and otherwise, the first one-way overflow valves have an overflow effect; the oil outlet of the reducing valve is connected with the control oil port of the hydraulic control reversing valve; the oil inlet of the hydraulic control reversing valve receives a speed control hydraulic oil source, and the oil outlet of the hydraulic control reversing valve is connected with the control oil port of a walking motor on one side; and the oil returning port of the hydraulic control reversing valve is connected with an oil tank. The excavator walking automatic speed regulating system and the excavator have the beneficial effects that high and low speed can be switched automatically according to a driving condition, so that self-protection to elements of a walking system is realized.

Description

technical field [0001] The invention belongs to the technical field of excavators, and in particular relates to an automatic speed regulation system for excavator walking and the excavator. Background technique [0002] Large-scale is widely used in open-pit mines, large-scale infrastructure construction and other working conditions. Its working terrain is complex, and large hydraulic excavators often perform transition work, requiring them to adapt to complex road conditions. Generally, excavators use a tensioning system to buffer and protect the chassis structure, but only when the external resistance is relatively large, the chassis buffer mechanism can play a buffering role. Most of the excavator's walking impact is caused by the resistance within the range of its walking traction when walking at high speed, and at this time the chassis tension system cannot play the role of buffer protection. Especially when the excavator is running at high speed, when it encounters a...

Claims

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Application Information

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IPC IPC(8): E02F9/22
CPCE02F9/2221
Inventor 史继江李宗张宏秦家升费树辉胡义王振兴孙本强石立京张飞
Owner XCMG EXCAVATOR MACHINERY
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