Title:
SLUICE OPENING/CLOSING APPARATUS AND METHOD FOR MANUFACTURING RACK BAR THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/171351
Kind Code:
A1
Abstract:
Provided are a sluice opening/closing apparatus and a method for manufacturing a rack bar of the sluice opening/closing apparatus, the method comprising the steps of: manufacturing a pair of flat steel bars (31) having a plurality of grooves that are symmetrical to each other and aligned in a line; and manufacturing a plurality of round bars (32), further comprising the steps: of hot-working the pair of flat steel bars (31) by putting the pair of flat steel bars (31) into oil and heating same, so that the size of each groove of the pair of flat steel bars (31) and the size of each round bar (32) have an interference fit tolerance therebetween and the pair of flat steel bars (31) can be equally heated up to the inside thereof; and/or cold-working the plurality of round bars (32) by cooling the plurality of round bars (32) in a cooling atmosphere formed by the evaporation of liquefied gas, so that the plurality of round bars (32) can be equally heated up to the inside thereof, and further comprising a step of coupling the plurality of round bars (32) between the pair of flat steel bars (31) by restoring same to room temperature in a state in which both ends of each round bar (32) are fitted with a clearance between the two facing grooves (A) of the pair of flat steel bars (31).
Inventors:
CHANG JUNG SOO (KR)
KIM BO OK (KR)
KIM BO OK (KR)
Application Number:
PCT/KR2019/016175
Publication Date:
August 27, 2020
Filing Date:
November 22, 2019
Export Citation:
Assignee:
DAEDO ENTEC CO LTD (KR)
CHANG JUNG SOO (KR)
CHANG JUNG SOO (KR)
International Classes:
B23P11/02; B66F1/06; E02B7/36; F16B4/00
Foreign References:
| KR20070020194A | 2007-02-20 | |||
| KR101012475B1 | 2011-02-08 | |||
| KR20060007230A | 2006-01-24 | |||
| CN101407306A | 2009-04-15 | |||
| JPH07224417A | 1995-08-22 | |||
| KR101975005B1 | 2019-05-03 |
Attorney, Agent or Firm:
SEONG, Nak Hoon (KR)
Download PDF: