The screw jack, also referred to as the mechanical jack, is driven by a manpower through a screw pair, and a screw or nut sleeve is used as a jacking member. The normal screw jack supports the weight by the thread self-locking function, and the structure is simple, but the transmission effectiveness is definitely low and the come back stroke is slow. The thread of the self-propelled screw jack does not have any self-locking action and has a brake. When the brake can be released, the weight could be quickly lowered by itself and the return time can be shortened, however the framework of the jack is certainly complicated. The screw jack can support heavy objects for a long time, and the utmost lifting capacity has already reached 100 tons, which is widely used. Following the Conveyor Chain horizontal screw is certainly mounted on the low part, the weight could be traversed at a small distance.

Principle useful:

The mechanical jack is among the types of manual lifting tools. Its compact framework makes reasonable utilization of the rocking of the rocker to rotate the pinion. It is operated by a pair of conical gears to drive the screw to rotate and force the lifting sleeve so that the weight rises or decline.

Instructions:

1. Before use, it is necessary to check if the jack is regular, whether the parts are flexible, increase lubricating oil, and correctly estimate the weight of the large object. Use a jack of appropriate tonnage and steer clear of overloading.

2. Adjust the method of supporting the teeth on the rocker. First of all, turn the rocker straight in the clockwise direction by hand to help make the lifting sleeve quickly ascend the top weight.

3. Insert the handle into the rocker hole, move the deal with along, and the weight will rise. When the reddish colored warning line shows up on the lifting sleeve, the handle ought to be stopped instantly. If you need to lower one’s teeth in the opposite direction, the pounds will start to fall.

Precautions:

1. Often keep the surface of the machine clean, verify the internal structure frequently, make the pinion in the rocker versatile and dependable, and lift the lifting sleeve openly.

2. The friction surface between the lifting sleeve and the housing must be oiled anytime. Other essential oil filling holes ought to be lubricated regularly.

3. In order to consider the security in use, avoid overloading, use illness, it isn’t appropriate to make use of multiple units in order to avoid danger.