Brief description: For each batch of screw, “running life” test, “screw operating life” determines the total number of manual nursing beds in manual lifting back and leg operation; (screw running life tester) is provided The front and rear limit position sensor can be used to detect the screw with different length and different stroke; the motor is operated, and the induction switch cooperates to realize the automatic front and rear elongation shortening.

Test standard: The screw operation life test is calculated by 8 hours per day, and can be extended 720 times before and after, and rotated 14400 times. After the test is completed, the screw runs smoothly, the lubrication is no different, and there is no card position.