As a special transport vehicle, a refrigerated truck must inspect the matters needing attention before driving to prevent unnecessary troubles during the journey. The following inspections are recommended before each loading of goods. 1. The refrigerated vehicle fuel diesel or gasoline supply must be sufficient to ensure that the engine runs to at least the next checkpoint. Ultrasonic Drilling Rig For Geological Survey Investigation
Sonic drilling is a soil penetration technique that strongly reduces friction on the drill string and drill bit due to liquefaction, inertia effects and temporary reduction of porosity of the soil. The combination makes penetrating for a large range of soils easy for our Sonic rigs and tooling. The penetration rates in most bedrock are faster with this technology also.
At first glance, a SONIC drilling rig looks very much like a conventional air or mud rotary drill rig. The biggest difference is in the drill head, which is slightly larger than a standard rotary head. The head contains the mechanism necessary for rotary motion, as well as an oscillator, which causes a high frequency force to be superimposed on the drill string. The drill bit is physically vibrating up and down in addition to being pushed down and rotated. These three combined forces allow drilling -to proceed rapidly through most geological formations including most types of rock.
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2. The refrigerating car engine oil engine oil level is supplied at the (full) mark, do not overfill with oil (changed once a year).
3. Refrigerant truck coolant Check the coolant level gauge to see if the amount of coolant is correct and the pointer should be within the white range. If the coolant level is in the red range, add coolant to the coolant tank. Usually the coolant is a mixture of ethylene glycol and water (according to the actual situation of the product used in different proportions), and should provide protection to -34 °C without freezing. Note: Do not open the lid of the coolant tank when the coolant is hot.
4. The battery terminal of the refrigerated truck must be firm and not corroded. The electrolyte should be at the full mark.
5. Belt straps must be good and adjusted to the appropriate degree of swell. The 13mm sag across the center between the pulleys .
6. Electrically inspect all electrical connections in the electrical control circuit to ensure they are securely fastened. Wires and terminals should be free from corrosion, cracking or moisture.
7. Structure Visual inspection of the unit for leaks, loose parts or breakages and other damage.
8. The gasket of the gasket unit should be tightly pressed and in good condition.
9. Refrigerated car coil condenser and evaporator coil should be clean and free of dirt.
10. Defrost Drain Check defrost drain hoses and fittings to ensure they are free.
11. The cargo can not block the evaporator outlet and return air inlet when loading the cargo compartment, and maintain the cold circulation of the cargo compartment to ensure that there will be no hot spots in the compartment. 
In overburden, the vibratory action causes the surrounding soil particles to fluidize, thereby allowing effortless penetration. In rock, the drill bit causes fractures at the rock face, creating rock dust and small rock particles, which facilitates advancement of the drill bit. In many instances the drilling and coring of rock and earth can be accomplished without the use of any drilling fluid whatsoever. This is an important requirement for environmental drilling projects. Compressed air, drill mud, or plain water can be utilized to remove the cuttings and speed up the operation further, depending on the application that the machine is used for.
The oscillator is driven by a hydraulic motor and uses out of balance weights to generate high sinusoidal forces that are transmitted to the drill bit. An air spring is also incorporated in order to confine the alternating forces to the drill string. The frequency can be varied to suit operation conditions and is generally between 50 and 160 hertz (cycles per second). As a comparison, ordinary household current in many countries alternates at 60 hertz. This frequency range falls within the lower range of sound vibrations that the human ear is capable of hearing.
While the principle behind the SONIC drill rig appears complicated, the machine is actually very simple to operate. The driller only adds vibratory energy to the normal rotary motion. He simply chooses a frequency that gives him the best drilling rate or best core recovery, as the case may be.