Title:
DAMPING SYSTEM FOR MOVABLE ARM OF LOADING MACHINE, AND OPERATION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2022/161068
Kind Code:
A1
Abstract:
A damping system for a movable arm of a loading machinery, and an operation machine. The damping system comprises a multi-way valve (1), a movable arm oil cylinder (2), a movable arm damping valve (3) and a damping lock (4). The multi-way valve (1) comprises a movable arm valve element and a bucket valve element, wherein a first movable arm oil port (B2) of the movable arm valve element is in communication with a rod cavity of the movable arm oil cylinder (2); a second movable arm oil port (A2) of the movable arm valve element is in communication with a rodless cavity of the movable arm oil cylinder (2); the rod cavity of the movable arm oil cylinder (2) is in communication with the movable arm damping valve (3); and the rodless cavity of the movable arm oil cylinder (2) is in communication with the movable arm damping valve (3) by means of the damping lock (4). A switching oil port (K) of the damping lock (4) is in communication with an unloading position (b1) of the bucket valve element. In the damping system for a movable arm of a loading machine, the damping lock (4), which contains a damping communication station and a damping cutting-off station, is additionally arranged, the damping lock (4) is controlled by means of pilot pressure of the unloading station (b1), so that when the pressure of the switching oil port (K) of the damping lock (4) reaches a preset pressure, the damping lock (4) is switched from the damping communication station to the damping cutting-off station, and the problem of the height of a bucket being greatly reduced due to the bucket unloading materials and pressing the movable arm mechanism downward is effectively solved.
Inventors:
MA LICHUN (CN)
LIU ZIDA (CN)
JIANG WEIAN (CN)
LIU ZIDA (CN)
JIANG WEIAN (CN)
Application Number:
PCT/CN2021/141660
Publication Date:
August 04, 2022
Filing Date:
December 27, 2021
Export Citation:
Assignee:
SHANGHAI SANY HEAVY MACHINERY CO LTD (CN)
International Classes:
E02F3/28; E02F3/38
Foreign References:
| CN112942456A | 2021-06-11 | |||
| CN112031064A | 2020-12-04 | |||
| JPH08277548A | 1996-10-22 | |||
| CN203808126U | 2014-09-03 | |||
| CN110847279A | 2020-02-28 | |||
| CN2736315Y | 2005-10-26 | |||
| CN102720232A | 2012-10-10 | |||
| KR20080058930A | 2008-06-26 | |||
| CN110894731A | 2020-03-20 | |||
| CN104278703A | 2015-01-14 |
Other References:
See also references of EP 4219838A4
Attorney, Agent or Firm:
CN-KNOWHOW INTELLECTUAL PROPERTY AGENT LIMITED (CN)
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