Manual chain hoist is a mechanical device that is used to lift various heavy loads, equipment and various items. It consists of 2 chains, while if you pull on one, then the other lifts the load. The force generated at the moment increases the rate of rise by thirty times.
How does manual hoist strength increase?
The mechanism of action is quite simple. Hand chain hoist works on the principle of converting light effort, which is applied to the drive chain, into the incredible force by which weights are lifted.
What does a manual hoist consist of?
The design includes:
- drive wheel;
- drive chain;
- gear gears;
- drive shaft;
- load chain;
- load chain wheel.
The chain hoist itself is suspended directly above the load that needs to be lifted using a special hook. The chain is attached directly to the load. If you pull the drive chain, the wheel rotates the drive shaft, which drives the gears. At the same time, it is possible to lift the load from the other end of the mechanism.
How do gears concentrate the force that enters the chain wheel?
The drive chain is attached to the drive wheel in special segments, the number of which is 7. The moment we tighten the chain, it rotates it. The wheel is screwed tightly to the friction plate attached to the ratchet. At that moment, when the whole three-component system rotates, the latch enters directly into the teeth of the ratchet, while not allowing the wheel to rotate in the opposite direction under the influence of the weight of the load.
Also, considering how the manual chain hoist works, it is worth noting that the drive wheel is attached to the drive shaft. Turning the first part drives the second.
On the opposite end of the shaft there is a gear small gear with five teeth. If it rotates, then the force that is transmitted through the drive wheel by the drive chain increases many times. Therefore, it increases in the ratio of seven to five.
A small gear wheel drives two other large gear wheels at the same time. So, the driving force of the small gear is proportionally distributed by another 2. Thus, only five teeth drive thirty-two at once. Behind each of the large wheels there is another small wheel with 4 teeth, it increases the power of the system in the ratio of eighteen to four. The final structural element is another large gear with nineteen teeth, concentrating all the power on the links of the lifting chain, attached to the drive wheel. Thus, the force that a manual chain hoist (3 tons including) can increase thirty times.
This is an incredibly simple mechanism consisting of several gears and two chains. Hand chain hoist (1t it rises easily) increases strength due to the transformation of light effort, which is accessible to many people.