It is widely used in the construction of the projects e. G. Prospecting, railway, road, port, bridge, water conservancy and hydropower, well, industrial and civil construction, geological exploration, especially used in mining wireline diamond core drilling and inclined hole wireline core drilling, etc.
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The mast (derrick) type is generally classified as A type, K type, tower type and mast type etc.
A type mast, its leg section is rectangular or triangle shape, with better loading capacity and stability,connected with pins between sections, installed at low level and erected or lowered down integrally by drawworks and A-frame.
K type mast, namely front opening mast, its transverse section is a shape truss structure, its both sides are composed of several pieces or segments, its back is rigid frame or pole system of truss, connected with pins or bolts between segments and members, may be installed at low level and erected or lowered down integrally by drawworks or hydraulic cylinder, has the advantages of convenient installation and teardown, excellent rigidity.
Now a lot of car maintenance and tire repair shop for the sake of recruiting customers are saying that as long as I come to the shop to replace the car tires, we do four wheel alignment and balance for everyone free of charge. This is a typical bright spot, but as a vehicle owner we will not consider what the shopkeepers have recommended for us, nor have we thought of the need for doing so.
It is necessary for me to make four-wheel alignment and balancing when we finish the next change of automobile tires.
In fact, whether or not we change new tires, as long as we disassemble the car tires, we need to make a dynamic balance. Because when the tire is reinstalled on the hub, the average force will not be 100%. If we do not make a balancing act then it is very likely that with the increase in the time we are driving cars, tire wear will even cause damage to the parts of the car that are dithering. So, as long as we disassemble the car tires as much as possible to make the next move. Because in this way we can reduce the abnormal wear of the car tires, thereby increasing the life of the car tires.
If we change the new tires, we recommend doing a four-wheel alignment. Although four-wheel alignment is not a must, it is necessary to make a four-wheel alignment if the front wheel of our car has uneven tire wear. If the wear is even and the car does not run away, then the four wheel alignment can never be done. If it is evenly worn, it proves that the tire is in a normal and very good position. In fact, the four-wheel alignment is mainly to make our car go straight and in order to even wear our tires. Therefore, if the tire wears out uniformly, there is no need to do four-wheel alignment.