In the above we have analyzed the hydraulic valve cylindrical spool structure, the radial imbalance force acting on the spool causes the spool to become stuck, called "hydraulic clamping." With the continuous development of drilling production, the use conditions of drilling rigs have become more and more diversified, and various types of drilling rigs have appeared accordingly. Factors affecting the type and composition of drilling rigs include drilling method, drilling depth, borehole size and drilling tool size, and drilling area conditions (such as electricity or fuel, transportation, and meteorological conditions). Oil Drilling Rigs,Mine Drilling Rigs,Water Well Drilling Rigs,Exploration Drilling Rigs Rugao Yaou Import & Export Trade Co., Ltd , https://www.ntyaoumachinery.com
The "hydraulic clamping" in the hydraulic system is the result of the radial imbalance of the spool due to the geometry error of the spool motion pair and the change in the coaxiality.
2, the danger of hydraulic clamping
A slight hydraulic clamping increases the frictional resistance when the spool moves, which can cause the control of the system components to lag behind and cause the hydraulic equipment to malfunction.
1 When the hydraulic clamping resistance is greater than the movement force of the spool, the spool will be hydraulically stuck and cannot move.
2 If the movement of the hydraulic spool is driven by electromagnetic force, the AC solenoid is easily damaged if the spool is hydraulically stuck.
3 Hydraulic clamping will accelerate the wear of the spool and reduce the service life of the components.
3, the elimination of hydraulic clamping
1 should improve the cleanliness of hydraulic oil and reduce the ingress of particulate pollutants.
2 The probability of the valve core and the valve hole mating surface. To ensure the accuracy of the valve core and valve hole.
3 When assembling and installing the slide valve, the tightening torque is guaranteed and it should be evenly tightened.
4 Guarantee the proper temperature in the use of hydraulic oil to prevent the valve core from being deformed by thermal expansion.
5 For the valve core with the pressure equalization groove on the surface, pay attention to the smooth flow of the pressure equalization groove.
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1. According to drilling method
(1) Impact drilling rigs, such as wire rope impact drilling rigs (drilling rigs), vibration drilling rigs, etc.
(2) Rotary drilling rigs, such as those used in rotary drilling.
(3) Downhole power drilling tools, such as rotary drilling tools, turbo drilling tools, screw drilling tools, electric drilling tools, etc.
2. Divided by drilling depth
(1) Ultra-deep well drilling rig. It adopts a drilling rig with a diameter of 114 mm drill pipe, a nominal drilling depth range of more than 7000 meters, and a maximum hook load of more than 4,500 kN.
(2) Deep well drilling rig. The drill rod is 114 mm in diameter, the nominal drilling depth is 4000-7000 meters or more, and the maximum hook load is 2250-4500 kN or more.
(3) Drilling rigs for medium and deep wells. It adopts a drilling rig with a diameter of 114 mm drill pipe, a nominal drilling depth range of 1500-4000 meters or more, and a maximum hook load of 900-2250 kN or more.
Three, according to power equipment
(1) Diesel Engine-driven drilling rigs, which use diesel engines as power through mechanical transmission or hydraulic transmission.
(2) AC driven drilling rig, suitable for use in oil fields with industrial power grids.
(3) The drilling rig is driven by direct current, and the working unit is driven by a direct current motor.
Fourth, according to the driving mode
(1) Drive alone. Each working machine is driven by generators of different sizes, which are mostly used for electric drive. The transmission is simple and easy to install, but the power utilization rate is low and the total equipment mass is large.
(2) Unified drive. The three working units of drawworks, drilling pump and turntable are driven by the same power unit. Most drilling rigs use this scheme. The unified drive can also include only one drilling pump, and the other drilling pump is driven separately. The unified drive drilling rig has high power utilization and can be adjusted mutually when the engine fails, but the transmission is complicated, installation and adjustment are troublesome, and the transmission efficiency is low.
(3) Group drive. The combination of power is between individual drive and unified drive. There are two options for three working machines. The power utilization rate of this kind of drilling rig is higher than that of a single drive, and the transmission ratio is simple to drive in a unified manner. Two sets of working machines can also be installed on different heights and scattered sites.