Product Description Mutifunction Drilling Machine,Multi Purpose Drilling Rig,Multi Function Drilling Machine,Multipurpose Drilling Rig JIANGSU XI TEC ENVIRONMENTAL&DRILLING EQUIPMENT COMPANY CO.LTD , https://www.sjxitecdrilling.com
The water and air dual purpose series drilling rig is a multifunctional drilling rig that integrates water and air drills. This is the first one in China. The drilling rig adopts an AMT manual automatic transmission. Sensitive and convenient switching between positive and negative. Compared with hydraulic transmission, the power consumption is reduced by 35%, making it more efficient and energy-saving. The drilling rig has a fast speed and can be used in conjunction with a Mud Pump to solve the problem of difficult drilling with a soil gas down-hole hammer. The boring machine has high torque and can slide up and down. Deep hole drilling can be used for hard rock layers, gravel layers, and pebble layers below deep wells. Drill with a down-hole hammer. This drilling rig can be professionally engaged in drilling, monitoring wells, geothermal air conditioning drilling, diamond bit wired coring drilling, and engineering geological survey operations.
The main characteristics of the drilling rig:
1. The drilling rig is equipped with a hydraulic drill tower, hydraulic support legs, and a winch, and the power head can slide up and down. Hard rock can be used for DTH hammer drilling.
2. The drilling rig adopts a long stroke dual speed mechanism and mechanical power head, with a power head stroke of 3400mm, which is used to improve drilling efficiency and reduce the occurrence of blockage and burning accidents.
3. The drilling rig adopts dual oil pumps for oil supply. When feeding, a single pump is used, and when lifting the drill pipe, a dual pump combination is used; Low power loss and short auxiliary time.
4. The drilling rig has reserved some functional interfaces in the hydraulic system, which can be expanded according to the process requirements of different users.
Coaxial cable temperature characteristics
We know that coaxial cable is composed of inner conductor, outer conductor, insulation medium and sheath. The outer conductor has two basic functions: the first is the effect of the return conductor and the second is the shielding effect. Insulating media (ie, physical foaming) and jackets all play a role of insulation, protection, and shielding. When the temperature changes, it is not a decisive factor for the loss of the entire cable. The inner conductor is an important part of the signal transmission, so the cable signal attenuation is mainly caused by the loss of the inner conductor resistance.
Copper is the main material of the inner conductor, and there are mainly two kinds of foamed copper wire and copper clad aluminum wire. In our CATV system, we mainly use the material of foamed copper wire. This material can easily locate the inner conductor at the center of the insulation medium, making the inner and outer conductors truly “coaxial†and improve the transmission characteristics of the cable. However, copper has inherent metal (material) characteristics, which also led to it as the culprit in cable signal attenuation.
First, the attenuation in the coaxial cable is related to the resistance (ie, the inner conductor). The resistance of a conductor is a property of the conductor itself, and its size depends on the material, length, and cross-sectional area of ​​the conductor. In addition, the temperature has a great influence on the resistance of the conductor. For most conductors, the higher the temperature, the greater the resistance; for a few conductors, the temperature rises and the resistance is smaller. Copper belongs to the former, and when the temperature rises, the resistance increases; when it decreases, the resistance decreases. Therefore, according to the laws of physics (metal properties), we can think that the inner conductor (copper) of a coaxial cable also conforms to, or follows this rule, that the temperature is high, the impedance is large, the level is reduced, the temperature is low, and the impedance is small. The level increases. The temperature change has a great influence on the copper conductor (coaxial cable), which is also a metal (physical) characteristic of copper, and there is no way to solve it, but we can choose to compensate with an active device with a temperature compensation function. To reduce the impact of temperature changes on the cable, improve the user's viewing results.
As stated, no one system can withstand such strong level fluctuations and changes. If the signal level rises or falls by about 6 to 10 dB, the user's demand cannot be satisfied if a better method cannot be used to compensate. Therefore, for long-distance trunk lines, we must try to change its original design and rationalize it (such as changing to fiber-to-the-building). However, as the temperature changes, the impact on cable levels is a difficult technical problem for cable systems. Therefore, the effective use of temperature compensation amplifiers is the best and most practical method of existing CATV systems.