The screw jack, also known as the mechanical jack, is driven by a manpower through a screw pair, and a screw or nut sleeve is Gear rack utilized as a jacking member. The ordinary screw jack supports the weight by the thread self-locking function, and the structure is simple, however the transmission efficiency is normally low and the return stroke is sluggish. The thread of the self-propelled screw jack has no self-locking action and is equipped with a brake. When the brake is certainly released, the weight can be quickly lowered alone and the return period can be shortened, but the structure of the jack can be 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. After the horizontal screw is usually mounted on the low part, the weight can be traversed at a little distance.

Principle of use:

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

Instructions:

1. Before use, it’s important to check if the jack is regular, whether the parts are flexible, increase lubricating oil, and correctly estimate the fat of the heavy object. Use a jack of suitable tonnage and steer clear of overloading.

2. Adjust the technique of supporting the teeth on the rocker. Firstly, turn the rocker directly in the clockwise path by hand to make the lifting sleeve quickly ascend the top weight.

3. Insert the handle in to the rocker hole, move the handle up and down, and the fat will rise. When the reddish warning line shows up on the lifting sleeve, the handle ought to be stopped instantly. If you want to lower the teeth in the opposite direction, the excess weight will start to fall.

Precautions:

1. Usually keep the surface of the machine clean, examine the internal structure frequently, make the pinion in the rocker versatile and dependable, and lift the lifting sleeve freely.

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. To be able to consider the protection used, avoid overloading, use illness, it is not appropriate to use multiple units in order to avoid danger.