A negative flow control excavator attachment flow control device, method and excavator

A flow control device and flow control technology, applied in the direction of earth mover/shovel, construction, etc., can solve the problems of unstable operation, fast speed, excessive rotation flow of attachments, etc., and achieve the effect of ensuring reliability

Active Publication Date: 2022-04-15
QINGDAO LOVOL EXCAVATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present disclosure provides a negative flow control excavator attachment flow control device, method and excavator, which solves the problem of unstable operation caused by excessive rotation flow and too fast speed of the attachment. The pump only provides the minimum flow for the rotation of the attachment, which achieves the purpose of flow control

Method used

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  • A negative flow control excavator attachment flow control device, method and excavator
  • A negative flow control excavator attachment flow control device, method and excavator

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Effect test

Embodiment 1

[0029] Such as figure 1 As shown, it is a simplified schematic diagram of an existing negative flow control excavator equipped with attachments, the main valve part has been greatly deleted, and only the part useful to this patent is retained.

[0030] Principle of attachment clamping oil cylinder: operate clamping pilot valve 3, input pilot pressure oil from port 1 of clamping pilot valve 3 to drive the XBO port of the first spool 2-3 of the main valve, and replace the first spool 2-3 of the main valve direction, the main pressure oil passes through the main pump A2 port, passes through the first check valve 2-1 and the second check valve 2-2 in the main valve, passes through the first spool 2-3 of the main valve to the oil port AO, and then Clamp the B port of the oil cylinder 7 through AO, push the oil cylinder to clamp, return the oil through the A port, pass through BO, and then return to the oil tank through the first spool 2-3 of the main valve, because the first spool ...

Embodiment 2

[0041] Embodiment 2 of the present disclosure provides a negative flow control excavator attachment flow control method, using the negative flow control excavator attachment flow control device described in Embodiment 1;

[0042] (1) Working method of attachment clamping oil cylinder: operate clamping pilot valve 3, input pilot pressure oil from port 1 of clamping pilot valve 3 to drive the XBO port of the first spool 2-3 of the main valve, and the first spool of the main valve 2-3 reversing, the main pressure oil passes through the A2 port of the main pump, passes through the first check valve 2-1 and the second check valve 2-2 in the main valve, and reaches the oil through the first spool 2-3 of the main valve. Port AO, and then through AO, enter the oil into the B port of the clamping cylinder 7, push the oil cylinder to clamp, return the oil through the A port, pass through the BO, and then return to the fuel tank through the first spool 2-3 of the main valve, because the f...

Embodiment 3

[0045] Embodiment 3 of the present disclosure provides a negative flow control excavator attachment flow control system, including the negative flow control excavator attachment flow control device described in Embodiment 1 of the present disclosure.

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Abstract

The present disclosure provides a negative flow control excavator attachment flow control device, method and system, which at least include a main pump, a hydraulically controlled reversing valve, a throttle valve, a second shuttle valve, a pilot pump and an attachment rotation device. The attachment rotating device at least includes a rotary pilot valve and a first shuttle valve; the main pump at least includes a first Pi port of the main pump, the first oil port of the pilot pump is connected to one end of the throttle valve, and the throttle valve The other end of the valve is connected to the first port of the hydraulically controlled reversing valve; the hydraulically controlled reversing valve further includes at least a second port and a third port, the second port is connected to the rotary pilot valve through the first shuttle valve; The third port is connected to the first Pi port of the main pump through the second shuttle valve to ensure that the pressure of the first Pi port of the main pump is always maintained at the pilot pressure, so that the main pump always works at the minimum displacement; it can automatically identify the rotation of the attachment operation, to ensure that the main pump is working at the minimum displacement, to ensure the reliability of the motor, and will not affect the flow control of the main pump by other actions.

Description

technical field [0001] The present disclosure relates to the technical field of excavator attachment control, in particular to a flow control device and method for negative flow control excavator attachments and an excavator. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] At present, standard excavators are equipped with buckets. According to the requirements of working conditions, they are equipped with attachments. They have two actions, clamping materials and rotating. The clamping uses the cylinder as the actuator, which requires a large flow to ensure the speed, and the rotation is driven by the motor, which requires a small flow to ensure smooth and controllable performance. [0004] The inventors of the present disclosure found that, for the control of attachment rotation, in the existing control mode, the main pump supplies the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/20E02F9/22
CPCE02F9/20E02F9/22
Inventor 陈凯陈维雄胡月平袁玉荣张永江丁坚持赵龙
Owner QINGDAO LOVOL EXCAVATOR
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