Double-propping head incubator for low-temperature CTOD (Crack Tip Opening Displacement) tests

The invention discloses a double-propping head incubator for low-temperature CTOD (Crack Tip Opening Displacement) tests. The double-propping head incubator comprises a rotational low-temperature tank, a buckling failure propping head, a breaking propping head, a liquid discharge micro ball valve, limiting screws and a test machine connecting plate, wherein the rotational low-temperature tank is a tank body of which the upper end is opened; the buckling failure propping head and the breaking propping head are arranged inside the rotational low-temperature tank; the liquid discharge micro ball valve is mounted on a side wall of the rotational low-temperature tank; two sides of the rotational low-temperature tank are positioned by using the limiting screws; the test machine connecting plate is arranged at the bottom of the rotational low-temperature tank. Therefore, when low-temperature CTOD tests are implemented, rapid and accurate positioning of a double-point pressing head and two single-point propping heads