According to the relative bearing and lifting method of spreader and lifting object, the lifting method can be roughly divided into the following 7 kinds
(1) hoisting method of the manufacturer of the tensioner for fixing the bearing of the spreader and the force on the spreader
There are several fixed tools:
(l) the appliance passes through the center of gravity of the object.When the spinner is lifting the object, the spinner and the center of gravity of the object are on a plumb line, as shown in figure a below, then the process of reuse with the object is smooth, and the force on the spinner is equal to and slightly larger than the weight of the object (due to the influence of dynamic load).
(2) "recumbent, sling hanging in the center of the" end, in the process of hoist and lifting objects in contact with the ground at one end and because of its micro friction and make the sling in violation of the vertical, the hook lift force is greater than the weight in half, then sling force is smaller, fast to stand straight, sling stress sensitivity, to completely out of the ground, sling force is slightly greater than the weight, as shown in the above b.
(3) the lifting object is lying on its back, and the lifting object is hoisted at the longitudinal center of a point above the center of gravity of the lifting object. As shown in the figure C above, the stress of the lifting object is much more than half of the weight of the lifting object in the process of hoisting, and its stress depends on the distance between the lifting point and the center of gravity of the lifting object.The smaller the distance is, the larger the spreader's force will be, and vice versa.Then the force on the spreader becomes smaller, and when the spreader is about to stand upright, the stress on the spreader is more sensitive. When the spreader is completely lifted off the ground, the stress on the spreader is slightly larger than the weight of the spreader.Tensioner manufacturer's lifting method and lifting force
(4) the spreader is placed on a side surface above the center of gravity of the spreader, as shown in the figure d above. The stress of the spreader in the hoisting process of the tensioner manufacturer is similar to (3), but the slant of the spreader is slightly increased, so the stress is slightly larger.When the object is tilted off the ground, the object is balanced when its inclination reaches the point where the object's center of gravity is coincident with the object's center of gravity on a plumb line.In order to reach the lifting object straight, another force is applied to the lifting object.
(5) the hanging object is lying on its back. The lifting tool is hung at one end of the hanging object and the other end of the hanging object is connected to the fixed place.The force of the spreader is much more than half of the weight of the spreader, and it changes with the direction of the spreader. The higher the spreader is, the closer it is to the top of the dumpling, the smaller the spreader's force will be.Other, method of this kind of condole installs when condole content just holds one's head high, thrust to dumpling joint level, follow gradually condole upright this thrust is gradually small.
(2) bearing movement of the spreader
There are several kinds of azimuth movement of hoisting spreader:
(1) the lifting object is lying on its back, and the lifting device is suspended at the center of one end of the lifting object, as shown in the figure f above. When the lifting object is just lifted, the stress of the lifting device is half of the weight of the lifting object. After the lifting object is gradually straightened, the lifting device also moves with it.This method can ensure that the lifting object is always stable in the process of lifting, and the stress of the spreader is better than the method of fixing the spreader.When the object is upright and lifted, the force of the spreader is slightly greater than the weight of the object.
(2) double turn method pulls one of hang, be like figure g shows, hang a thing to lie down, hang a thing to stand obslant on hang a thing upper part, hang a thing and hang a thing to make dumpling contact point for turn a shaft, generally hang a height to should be greater than 1/3 of hang a thing length, hang a height to be some bigger pull hang a force to reduce.In pulling hang process, hang content and hang implement relative azimuth changeover, hold to must contain Angle, it is center gyrate with dumpling connection shaft only, when hang content is pulled use certain viewpoint, hang rope ground anchor and hang a point to become a straight line, criterion hang tool ends hang outfit function, by hang rope is continued force pulls hang content plank rise straightening.
(3) double rotation method of pulling the second, the difference between this method and the above mentioned method is that the lifting object and the lifting device do not share a dumpling with the turning point, and the lifting device's turning point moves a distance to the direction of the lifting point. This method can appropriately reduce the height of the lifting device and reduce the stress of the lifting device.