초록 ▼

Leak test equipment which includes a master side pneumatic system and a work side pneumatic system executes a leakage test sequence basically including pressurizing, balancing and detecting steps under control of a microcomputer. A nonvolatile read/write memory has prestored therein an equivalent in

Leak test equipment which includes a master side pneumatic system and a work side pneumatic system executes a leakage test sequence basically including pressurizing, balancing and detecting steps under control of a microcomputer. A nonvolatile read/write memory has prestored therein an equivalent inner volume of the work side pneumatic system corresponding to each type of work being tested for leakage. In a leak test, a leakage DL=VEㆍDDE read out of the nonvolatile read/write memory. The calculated leakage is compared with an allowable value of leakage, thereby deciding whether the work is acceptable or not.

대표청구항 ▼

Leak test equipment provided with a check function, comprising: (a) means for charging compressed air of a test pressure into a master side pneumatic system having a reference tank connected thereto and a work side pneumatic system having a work connected thereto; (b) differential pressure sensing m

Leak test equipment provided with a check function, comprising: (a) means for charging compressed air of a test pressure into a master side pneumatic system having a reference tank connected thereto and a work side pneumatic system having a work connected thereto; (b) differential pressure sensing means for measuring the pressure difference between the master side pneumatic system and the work side pneumatic system; (c) volume changing means connected to the work side pneumatic system, for changing its inner volume by a known amount; (d) equivalent inner volume calculating means for calculating an equivalent inner volume of the work side pneumatic system on the basis of the pressure difference between the work side pneumatic system and the master side pneumatic system, resulting from the volumetric change by the volume changing means and measured by the differential pressure sensing means, the volumetric change, and the test pressure; (e) a nonvolatile RAM for storing the equivalent inner volume calculated for each type of work; (f) check means whereby a new equivalent inner volume computed by the equivalent inner volume calculating means and the corresponding old equivalent inner volume stored in the nonvolatile RAM are compared with each other and it is decided whether an error therebetween is within a predetermined value or not; (g) leakage calculating means for calculating the leakage from the work on the basis of the corresponding equivalent inner volume read out of the nonvolatile RAM and the pressure difference measured by the differential pressure sensor; (h) means for deciding whether the leakage calculated by the leakage calculating means is within an allowable leakage range; and (i) indicating means for indicating a decision of the deciding means.