液压管路内存在一定高度液位，高度按30米，需考虑其对活塞杆产生的推力，

There is a certain liquid level in the hydraulic pipeline, and the height is 30 meters. It is necessary to consider the thrust generated by it on the piston rod. There is a spring in the rod cavity to prevent it from being squeezed out by back pressure. At the same time, the spring mechanism should ensure that it can be squeezed and contracted under a small hydraulic pressure, without affecting the normal working thrust of the piston rod, and when the locking mechanism is unlocked, it will not produce excessive resistance.

There is a certain level of liquid in the hydraulic pipeline, with a height of 30 meters. It is necessary to consider the thrust generated by it on the piston rod, and a spring is installed in the rod chamber to prevent it from being squeezed out by back pressure. At the same time, the spring mechanism should ensure compression and contraction under small hydraulic pressure, without affecting the normal working thrust of the piston rod, and without generating excessive resistance when the locking mechanism is unlocked.

There is a certain height of liquid level in the hydraulic pipeline, and the height is 30 meters. It is necessary to consider its thrust on the piston rod, and there is a spring in the rod cavity to prevent it from being squeezed out by back pressure. At the same time, the spring mechanism should ensure that it is squeezed and shrunk under small hydraulic pressure, which will not affect the normal working thrust of the piston rod, and will not produce excessive resistance when the locking mechanism is unlocked.