See information
Look carefully to see if you have a complete set of random documentation. When purchasing value is high or when importing agricultural machinery, the dealer should also be required to present the inspection report and import declaration procedures and product quality inspection form of the agricultural machinery inspection department.
Look at the appearance
Carefully observe the appearance of agricultural machinery products. Mainly from the vertical and horizontal two angles to observe whether the whole machine is deformed, the appearance of the whole machine is not lack of paint, serious scratches, bubbling and so on. The metal material must be coated with anti-rust paint as the primer, and the machine cover and sheet metal parts should be smooth and smooth.
Look at the assembly
Check the machine assembly in detail. Check whether the parts and parts of the agricultural machinery are intact and correct, and whether the specifications are installed. All the rotating, transmission and operating devices of the machine are flexible and have no stuck. Have a reliable safety device. Where mechanical damage is likely to occur to the user's personal safety, safety protection devices should be provided. There must be a permanent warning sign at the location of the accident.
Retry machine
It is necessary to carry out the start-up test when purchasing the machine. Understand whether the performance is good, whether the engine is running smoothly, whether the combustion condition and engine sound are normal, whether the direction, brakes, throttle, etc. are sensitive and reliable. The high-speed agricultural machinery (granulator, pulverizer) should pay special attention to the balance of the machine drum. Machines with pressure vessels (motorized sprayers, etc.) should be tested to see if their pump pressure can reach the specified value, whether the safety valve is functioning, and whether the piping and joints are leaking.
Orthopedic external fixation system
The screw orthopedic is inserted into the bone near the fracture, and the fracture is fixed with an external fixator assembled by a chuck and a nail rod.
Indications
open fracture, nonunion, closed fracture with extensive soft tissue injury, fracture with multiple trauma, osteotomy and correction.
The use of orthopaedic external fixators is currently a superior fracture fixation technique, filling the gap between cast and internal fixation. At the same time, orthopedic external fixator has the characteristics of simple fixation method, stable, reliable and effective, and does not limit the joint movement, can be early ambulation advantages. It can reduce the time for the operator and is more friendly to the user. The external fixator was used together with the bone traction needle. In terms of the classification of orthopedic external fixators, it is mainly divided into four types: orthofix type external fixation, ilizarov type external fixation, ao synthes type external fixation,combined external fixator and common external fixators.
The external fixators in orthopaedics was used for reduction (shortening and overlapping displacement were corrected first, then lateral and angular displacement were corrected, and finally rotational and separation displacement were corrected; If closed reduction is difficult, open reduction can be considered, but the separation of soft tissue and peeling of periosteum should be minimized.
The selection of the insertion site.According to the anatomical characteristics of the soft tissue at the insertion plane, the important nerves, vessels and tendons should be avoided; The ideal entry point is the part of the bone close to the subcutaneous, in a word, generally choose the skin and bone between the muscle soft tissue is the weakest point into the needle. The installation shall facilitate observation and control of soft tissue damage, and permit any surgery that may be required, such as repair and reconstruction, dressing change, skin grafting, or bone grafting." According to the location of the bone, different diameters of the threaded needle were selected. Removal was performed after completion of late treatment.
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