Pressure head assembly for sensor

The utility model discloses a pressure head assembly for a sensor. The pressure head assembly comprises an upper pressure head, a flexible limiting sleeve, a steel ball and a lower pressure head, the upper pressing head is of a rod-shaped structure and is provided with three sections, namely an upper threaded section, a first upper cylinder and a second upper cylinder in sequence in the axis direction, the second upper cylinder is located at the end of the upper pressing head, and an upper annular groove is formed between the first upper cylinder and the second upper cylinder; the second upper cylindrical end face is provided with an upper spherical inner cavity. The lower pressing head and the upper pressing head are identical in structure. The axes of the upper pressing head and the lower pressing head coincide, the upper spherical inner cavity and the lower spherical inner cavity are opposite and arranged in a spaced mode, and the steel ball is arranged between the upper spherical inner cavity and the lowe