Rod-spring structured clamping and loosening device for downhole belt replacement apparatus and operating method thereof

A rod-spring structured clamping and loosening device for a downhole belt replacement apparatus, wherein two sides of a crawler-type belt replacement apparatus are each provided with two sets of the rod-spring structured clamping and loosening device,

• the two sets of the rod-spring structured clamping and loosening device each comprise an upper cylinder fixed seat and a lower cylinder fixed seat, wherein a first end of the upper cylinder fixed seat is connected to an upper crawler belt via a pin shaft, and a first end of the lower cylinder fixed seat is connected to a lower crawler belt via another pin shaft;
• a second end of the upper cylinder fixed seat is connected to a second set of pull rods via a first set of nuts and a second end of the lower cylinder fixed seat is connected to a first set of pull rods via a second set of nuts;
• the first set of the pull rods and the second set of the pull rods each pass through a first transition plate, a second transition plate, and a third transition plate;
• a first chuck is mounted on a side of the first transition plate facing the upper cylinder fixed seat, a second chuck is mounted on a side of the third transition plate facing the lower cylinder fixed seat, the first set of the pull rods are fixed by a third set of nuts at the first chuck, and the second set of the pull rods are fixed by a fourth set of nuts at the second chuck;
• a disc spring is mounted between the first transition plate and the second transition plate, and a jack is mounted between the second transition plate and the third transition plate;
• a first set of spacer sleeves are mounted on the second set of the pull rods between the second end of the upper cylinder fixed seat and the first chuck, and a second set of spacer sleeves are mounted on the first set of the pull rods between the second end of the lower cylinder fixed seat and the second chuck.