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Rotary hydraulic system, control method of rotary hydraulic system and excavator

A hydraulic system and control valve technology, which is applied in the field of hydraulic systems, can solve problems such as increased wear of the rotary motor, adverse effects on the service life of the rotary motor, and slow rotation of the whole machine, so as to reduce wear, avoid long-term high-pressure conditions, and prolong service life. The effect of longevity

Active Publication Date: 2022-05-10
LIUZHOU LIUGONG EXCAVATORS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the excavator is turning on a half slope, unlike on a level ground, if the bucket load is heavy or the turning radius is large, the turning moment required by the upper mechanism will also increase due to the influence of the gravitational potential energy brought by the tilt angle of the body. Large, when the excavator turns from a low place to a high place, the insufficient turning torque may cause the whole machine to turn slowly or even fail to turn, which cannot meet the needs of normal operations. There are also related technologies that simply increase the turnaround to meet the needs of half-slope turning. The working pressure of the motor, which will keep the rotary motor in a high-pressure state for a long time, aggravate the internal wear of the rotary motor, and have an adverse effect on the service life of the rotary motor

Method used

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  • Rotary hydraulic system, control method of rotary hydraulic system and excavator
  • Rotary hydraulic system, control method of rotary hydraulic system and excavator
  • Rotary hydraulic system, control method of rotary hydraulic system and excavator

Examples

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Effect test

Embodiment 1

[0050] Such as figure 1 As shown, this embodiment provides a rotary hydraulic system, which includes an oil pump 1 , a rotary motor 2 , a first relief valve 3 and a controller 5 . Wherein, the input end of the oil pump 1 is connected with the fuel tank 13; the rotary motor 2 is used to drive the vehicle body to rotate, the output end of the oil pump 1 is connected to the rotary motor 2 through the first pipeline 6, and the first overflow valve 3 is connected to the first pipeline 6 and The oil tank 13 ; the controller 5 is connected with the first relief valve 3 and is used to control the relief pressure of the first relief valve 3 . In the slewing hydraulic system provided in this embodiment, the controller 5 can adjust the oil pressure of the first pipeline 6 by controlling the relief pressure of the first relief valve 3 , thereby realizing the adjustment of the driving oil pressure of the slewing motor 2 . When the vehicle is on a half-slope turning operation and turns fro...

Embodiment 2

[0064] Such as figure 2 As shown, this embodiment provides a control method for a rotary hydraulic system, which is applicable to the rotary hydraulic system in Embodiment 1. The control method for the rotary hydraulic system includes the following steps:

[0065] S1: Determine whether the vehicle is in the half-slope heavy-duty operation condition.

[0066] S2: If the vehicle is in a half-slope heavy-duty working condition, the controller 5 controls the first relief valve 3 to work at the first relief pressure.

[0067] S3: If the vehicle is not in the half-slope heavy-duty working condition, the controller 5 controls the first overflow valve 3 to work at the second overflow pressure, and the first overflow pressure is greater than the second overflow pressure.

[0068] If the controller 5 determines that the vehicle is in the half-slope heavy-duty working condition, and the vehicle body rotation requires a relatively large torque, the controller 5 can control the relief pr...

Embodiment 3

[0083] This embodiment provides an excavator, including the slewing hydraulic system in Embodiment 1, and the excavator can have corresponding beneficial effects of the slewing hydraulic system. When the excavator is working on a half-slope with heavy loads, the rotary motor 2 can provide a large torque to ensure the normal rotation of the excavator. Therefore, the rotary motor 2 can provide a small torque, which can avoid wear and life reduction caused by the rotary motor 2 being in a high-voltage state for a long time.

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Abstract

The invention relates to the technical field of hydraulic systems, and specifically discloses a rotary hydraulic system, a control method of the rotary hydraulic system and an excavator. The rotary hydraulic system includes an oil pump, a rotary motor, a first overflow valve and a controller. The pipeline is connected to the oil tank and the rotary motor, the first relief valve is connected to the first pipeline and the oil tank, and the controller is connected to the first relief valve and used to control the relief pressure of the first relief valve. When the vehicle is on a half slope and turns from a low place to a high place, the controller controls the first overflow valve to have a larger overflow pressure, the first pipeline will maintain a higher oil pressure, and the swing motor can output a larger torque to meet the vehicle’s demand for turning torque at this time; when the vehicle is working on level ground, the controller controls the first relief valve to have a smaller relief pressure, the first pipeline maintains a lower oil pressure, and the turning The motor outputs a small torque, which prevents the rotary motor from being in a high-pressure state for a long time, reduces the wear and tear of the rotary motor, and prolongs the service life.

Description

technical field [0001] The invention relates to the technical field of hydraulic systems, in particular to a rotary hydraulic system, a control method for the rotary hydraulic system and an excavator. Background technique [0002] There are many types of construction machinery with rotary operation capability, among which excavators are the most typical. Excavators are known as the king of construction machinery. They can use multi-mechanism compound actions to work under various complex working conditions. Among them, the slewing ability is one of the most important performances of excavators. The size of its slewing torque will directly affect the The overall operating efficiency. [0003] The excavator is composed of a lower traveling mechanism and an upper body slewing and installed on the lower traveling mechanism, and the slewing of the upper body is driven by a slewing motor. When the excavator is working on flat ground, the rotation of the upper body does not cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/22
CPCE02F9/2264
Inventor 王茄任李文新刘建毕金敏董必成
Owner LIUZHOU LIUGONG EXCAVATORS