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 used as a jacking member. The normal screw jack supports the weight by the thread self-locking function, and the framework is simple, but the transmission efficiency is certainly low and the come back stroke is sluggish. The thread of the self-propelled screw jack has no self-locking action and has a brake. When the brake is certainly released, the weight can be quickly lowered alone and the return time can be shortened, but the structure of the jack is usually complicated. The screw jack can support heavy objects for a long period, and the maximum lifting capacity has reached 100 tons, which is widely used. After the horizontal screw is definitely mounted on the low part, the weight can be traversed at a little distance.

Principle useful:

The mechanical jack is one of the types of manual lifting tools. Its Conveyor Chains compact structure makes reasonable use of the rocking of the rocker to rotate the pinion. It really is operated by a set of conical gears to operate a vehicle the screw to rotate and force the lifting sleeve to ensure that the pounds rises or decline.

Instructions:

1. Before use, it is necessary to check if the jack is normal, whether the parts are flexible, put lubricating oil, and properly estimate the fat of the large object. Make use of a jack of appropriate tonnage and prevent 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 very best weight.

3. Insert the handle into the rocker hole, move the handle along, and the fat will rise. When the reddish colored warning line appears on the lifting sleeve, the handle ought to be stopped immediately. If you need to lower one’s teeth in the opposite direction, the fat will begin to fall.

Precautions:

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

2. The friction surface between the lifting sleeve and the casing must be oiled at any time. Other oil filling holes should be lubricated regularly.

3. In order to consider the protection used, avoid overloading, work with illness, it is not appropriate to use multiple units in order to avoid danger.