该测量仪结构简单,仅由下测杆、身套、表夹、弹簧、管端以及带顶杆的芯轴等零件组成。上测杆可以通过平键在身套上移动。下测杆与芯轴固定在一起。另外在自由状态时,受弹簧力的作用,芯轴的下端与管端上端靠近;下测杆在弹簧力的作用下始终压向下限位。测量仪使用前先调节上测杆的位置,然后再按动 The measuring instrument has a simple structure and is composed of the lower measuring rod, the sleeve, the clamp, the spring, the pipe end and the mandrel with ejector rod. The upper rod can be moved by the flat key on the body. The lower rod is fixed with the mandrel. In addition, in the free state, by the spring force, the lower end of the mandrel is close to the upper end of the tube end; the lower measuring rod always presses towards the lower limit under the action of the spring force. Before using the gauge, adjust the position of the upper spindle and then press