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The ordinary lower opening is driven by the crankshaft inside the wall panel box to output the gear to the hand holding, and indirectly transmitted from the hand holding to the lifting foot to swing up and down and drive the frame to move up and down. During the up and down movement, there is a small amount of forward and backward movement. This forward and backward movement causes a small amount of damage to the frame. The most important thing is that all the components of the lower opening are in a water soaked state, which requires high maintenance, is cumbersome to maintain, and is more prone to damage, resulting in high repair costs and labor consumption.

Advantage: The upper opening first solves the transmission problem. The motor synchronous belt is directly transmitted to the upper open box, and the output of the box drives the movement of the integrated frame to achieve the desired effect. Without the transmission inside the wall panel, the load and wear inside the wall panel are greatly reduced, and there is no risk of water entering the wall panel due to the oil seal breaking at the ordinary joint. The internal structure of the upper opening box is simple with oil lubrication, and the failure rate and bottom maintenance and repair are very simple. The frame is changed to a lifting motion on the top and bottom of the host, and the slight left and right swing in the same direction as the frame can cause negligible damage to the frame. Without the wear and tear of holding hands, bushings, pins, and other parts, workers can easily handle it, and maintenance costs can be ignored.