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Title:
A PUMPING UNIT WITH A CURVED AND FOLDED WALKING BEAM
Document Type and Number:
WIPO Patent Application WO/2004/001185
Kind Code:
A1
Abstract:
The invention discloses a pumping unit with a curved and folded beam, comprising a base (1), a motor (2), a transmission mechanism (4), a crank-link assembly (5), a balance weight for the crank (10), a frame (9), a cable hanger assembly (11), a horse head (12), a bearing assembly for the frame (14), a walking beam assembly (13) and a bearing assembly (8) on the trail end of the walling beam. The trail end of the walking beam is curved and folded downward for a distance. The bearing assembly (13) on the trail end of the walling beam is provided on the upper surface of the trail end of the walking beam (13) and the balance weight (6) for the walking beam (13) on the lower surface of the trail end of the walking beam. Since the balance weight (6) is lowered for a distance, the output torque of the crank and therefore the power consumption is reduced during operation.

Inventors:
ZHANG ZHIPING (CN)
GUO ZHAOYONG (CN)
ZHANG GUANGSHUN (CA)
Application Number:
PCT/CN2003/000405
Publication Date:
December 31, 2003
Filing Date:
May 29, 2003
Export Citation:
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Assignee:
ZHANG ZHIPING (CN)
GUO ZHAOYONG (CN)
ZHANG GUANGSHUN (CA)
International Classes:
E21B43/12; F04B47/02; (IPC1-7): E21B43/00; F04B47/02
Foreign References:
CN1083942C2002-05-01
CN2349379Y1999-11-17
CN1302953A2001-07-11
CN2206360Y1995-08-30
CN2289075Y1998-08-26
Attorney, Agent or Firm:
Unitalen, Attorneys Law AT. (Xueqiang Rm.30703, 7th Floor Scitech Place, No. 22 Jian Guo Men Wai Ave, Chaoyang District Beijing 4, CN)
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