Vacuum sizing is decompression alarm device for case

The utility model discloses a vacuum sizing is decompression alarm device for case, including installing electric contact pressure gauge, alarm and the admission valve on the sizing case of vacuum, still include the vacuum pump of being connected with vacuum sizing case, be provided with an upper limit stationary contact, a lower limit stationary contact and a movable contact in the electric contact pressure gauge, upper and lower limit stationary contact links to each other with the alarm through respective wire. The utility model discloses an alarm that installs electric contact pressure gauge additional and be connected with electric contact pressure gauge on the sizing case of vacuum, the vacuum pressure and the suggestion of reporting to the police in the sizing case of ability real -time detection vacuum, the production of having stopped to lead to the fact the less than normal or phenomenon bigger than normal of tubular product external diameter because of the vacuum decompression has improved product