Title:
PRESSURE GAS LEAK INSPECTION DEVICE OF MOLDED CONTAINER AND BLOW MOLDING MACHINE
Document Type and Number:
Japanese Patent JP2699160
Kind Code:
B2
Abstract:
PURPOSE: To set the pressure gas injected into a molded container so as not to generate trouble in leak inspection even if main pressure changes by providing a pressure gas leak inspection circuit wherein pressure gas is set to the state supplied to the molded container in parallel to a pressure gas injection circuit having an opening and closing valve through a fine flow rate differential pressure sensor equipped with an orifice.
CONSTITUTION: A fine flow rate differential pressure sensor 11 equipped with an orifice is provided in parallel to a solenoid valve 2 and one end of a water column manometer 12 wherein water is put in a U-shaped tube is connected to the pressure air supply side thereof. When the solenoid valve 2 is closed by a timer relay 5 after a definite time is elapsed, in such a case that there is no pinhole in a bottle 3, the water column manometer 12 connected to the fine flow rate differential pressure sensor 11 is not operated. When the bottle 3 has a pinhole and compressed air is leaked, compressed air passes through the fine flow rate differential pressure sensor 11 to flow in the bottle 3 because the pressure in the bottle 3 is reduced. The water column manometer 12 connected to the fine flow rate differential pressure sensor 11 is operated by the flow of the compressed air.
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Inventors:
Keizo Seno
Application Number:
JP17958395A
Publication Date:
January 19, 1998
Filing Date:
June 23, 1995
Export Citation:
Assignee:
Tokogyo Co., Ltd.
International Classes:
G01L7/18; B29C49/80; G01M3/32; G01N7/00; B29L22/00; (IPC1-7): B29C49/80; G01L7/18; G01M3/32; G01N7/00
Domestic Patent References:
| JP62275731A | ||||
| JP3278936A | ||||
| JP5423589A |
Attorney, Agent or Firm:
Tadashi Sano