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Accessory flow control device and method for negative flow control excavator 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: 2019-12-27
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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  • Accessory flow control device and method for negative flow control excavator and excavator

Examples

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Effect test

Embodiment 1

[0029] like 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 2-3...

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 invention provides an accessory flow control device, method and system for a negative flow control excavator. The flow control device at least includes a main pump, a hydraulic operated directional valve, a throttle valve, a second shuttle valve, a pilot pump and an accessory rotating device, the accessory rotating device at least includes a rotary pilot valve and a first shuttle valve, the main pump at least includes a main pump first Pi port, a first oil port of the pilot pump is connected with one end of the throttle valve, and the other end of the throttle valve is connected with a first port of the hydraulic operated directional valve; the hydraulic operated directional valve further at least includes a second port and a third port, and the second port is connected with the rotarypilot valve through the first shuttle valve; and the third port is connected with the main pump first Pi port through the second shuttle valve, it is ensured that the pressure of the main pump firstPi port is always maintained at the pilot pressure, and thus the main pump always works at a minimum displacement. Accessory rotation operation can be automatically identified, it is ensured that themain pump works at the minimum displacement, the reliability of a motor is ensured, and control of other action operation for the main pump flow cannot be affected.

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 Applications(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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