The roller rig is the main perforating device for open pit mines, especially large open pit mines. In order to maintain the better drilling state of the roller rig in different rock layers, the slewing mechanism of the rig is required to perform stepless speed regulation according to the nature of the rock formation. The lifting/traveling mechanism of the rig also requires stepless speed regulation. At present, the slewing mechanism and the lifting/traveling mechanism of the roller rig are generally DC motor drives. There are three main types of speed control devices: (1) The roller rigs using thyristor DC speed control devices are: YZ-55, YZ-35 and YZ-12; (2) KY- using high-power magnetic amplifier speed control device Type 250 roller rig and 45R type wheel rig imported from the United States; (3) Type 60R roller rig imported from the United States using DC genset speed control device.
The application of variable frequency speed control technology on the roller rig is not only for energy saving, but more importantly, it is to improve the production efficiency of the rig and reduce the maintenance workload. The motor of the slewing mechanism is installed at the top of the drill pipe, and the working conditions are extremely bad. The DC motor used in the past is often damaged, the maintenance workload is large, and the normal operation and efficiency of the roller rig are affected. Therefore, the use of a rugged AC squirrel-cage motor instead of a DC motor, and the use of a frequency converter to replace the DC converter, has become the development direction of the electric drive of the roller rig. The difficulty in applying the variable frequency speed control technology on the roller rig is that the rig's turning mechanism and the like have high performance requirements for the speed regulating device, because the drilling rig may be stuck during the drilling work due to different geological conditions of the rock formation, so that the slewing The mechanism is blocked, which requires the mechanical characteristic curve of the governor to have the characteristics of the excavator, and has the function of immediate reversal and immediate restart and drilling; the roller rig has large vibration and high anti-vibration requirements for the speed control equipment. The application of variable frequency speed regulation in the roller rig is firstly applied by the US company BE on the 55R roller rig. The frequency conversion speed regulation of the roller rigs in mines in China is still under development and testing, and has not been promoted and applied.
HDPE Winding Structure Pipe
The performance characteristics of the HDPE winding structure wall tube are as follows:
1. The hot state of winding forming welding joint quality is high.
The flat material belt and U-shaped material belt extruded from the mouth die of the extruder in the melting state are evenly wound on the heated roller die according to the predetermined position, which ensures the quality of the fusion joint of the structure wall tube. In particular, in the structural design, the melt joint of the flat material belt is covered by a polyethylene-coated supporting tube, which improves the overall resistance to the external pressure of the product.
2. Good connection quality.
The pipe connection with excellent installation performance adopts the
embedded electric fuse in the socket with the same material socket welding
connection technology. It can achieve zero leakage, ensuring the same life span of the pipeline system and the safety of operation. At the same time, because the product under the condition of the same application as other tubes light weight, and is easy to transport, construction is convenient and quick, and can reduce the construction cost, in the range of applications, without a concrete cushion layer and concrete jaasiel groove can directly apply the tube after qualified, basically, stay do under excavation, side tube, while backfilling, simplifies the construction procedures, shortening the time limit for a project. During the project acceptance, the closed-air test is used instead of the closed-water test, which not only speeds up the acceptance but also saves the complicated work and a lot of test costs in the closed-water test
3. Good flexibility
High-density polyethylene winding structural wall pipe has macro flexibility, and the micro pipe section has strong rigidity and overall resistance to external pressure.
when used under heavy load road surfaces, it can ensure the safety of traffic. Due tothe flexibility of the pipe, it can also reduce the damage loss of the pipe to the minimum in the event of an earthquake, uneven surface settlement, and other geological activities. These characteristics improve the seismic mitigation ability of public facilities.
4. HDPE can be recycled, The main raw material of winding structure wall pipe
is green environmental protection products, such as high-density polypropylene, which doesn`t have any toxicity. There is no dye in the production process. The used pipeline can be 100% recycled. It is a green product of environmental protection.
5. Corrosion resistance, aging resistance, and service life span can be up to 50
years.
High-density polyethylene has the ability to resist chemical corrosion and
erosion. Therefore, when the winding structure wall pipe is conveying corrosive fluid or laying in corrosive soil, it does not need anti-corrosion treatment, and its performance is much better than other pipes. The product in the design process, chooses a reasonable product structure form, to ensure the service life span of the plastic pipe is more than 50 years, and no maintenance is needed in the life span.
6. Tube inner wall roughness, large water transfer around the structure of the
wall tube. Product inner wall roughness N is about 0.010, so the transmission of fluid has lower friction, compared to other products such as cement pipe with a similar diameter the water transfer is greatly improved. Therefore, the smaller HDPE tube can replace the larger cement pipes. In application, under the same conditions, using a wall pipe winding structure can have better reliability compared to the traditional pipe material. The comprehensive benefit is obvious, especially in the narrow construction site, high building density, underground pipeline, complicated traffic busy roads, and acid soil.
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