The working principle, application and characteristics of the cutting machine
The cutting energy of the cutting machine has been developed from a single flame energy cutting to the current multi-energy cutting method; the CNC cutting machine control system has been developed from the simple function, complex programming and input methods, and the degree of automation to a perfect function. Intelligent, graphical, and networked control; drive systems from stepper drives, analog servo drives to today's all-digital servo drives. The laser cutting machine is the fastest, the cutting precision is the highest, and the cutting thickness is generally small. The plasma cutting machine also cuts quickly, and the cutting surface has a certain slope. The flame cutter is designed for carbon steel with a large thickness. First, the working principle of the cutting machine The cable is normal, the protection and grounding is good, the protection device is safe and effective, the saw blade is selected to meet the requirements, and the installation is correct. After starting, it should be operated at no load, check and confirm that the saw blade is running in the correct direction, the lifting mechanism is flexible, and there is no abnormality or abnormal noise during operation. The operator should press the workpiece tightly with both hands and feed evenly. When pushing the cutter, do not use excessive force. Do not wear gloves when handling. The thickness of the cut shall be in accordance with the factory regulations and shall not be cut thick. When the workpiece is sent 300mm away from the saw blade or when cutting small pieces, it should be fed with special tools, and should not be directly pushed by hand. When the workpiece has impact, jump and abnormal sound, stop the inspection immediately, and then continue the operation after troubleshooting. It is strictly forbidden to inspect and repair all parts during operation. Debris on the saw table and in the kerf of the component shall be removed in time by special tools and shall not be picked up or wiped by hand. After the operation, the body should be cleaned, the saw blade should be dried, the remaining water in the water tank should be drained, the cable should be taken back, and stored in a dry and ventilated place. For cutting of mild steel, stainless steel, aluminum and other non-ferrous metals Second, the application of cutting machine Special-purpose CNC cutting equipment, contact and non-contact non-metal special CNC cutting equipment will also have a large space for development, and the entire CNC cutting machine market will continue to expand. Improve the production efficiency and cutting quality of CNC cutting machine, reduce the production and use cost, improve the automation level and system stability of the whole machine, and improve the system function to become the direction of its technology development. It is suitable for cutting the cylindrical orthogonal, oblique, eccentric and other phase-in-line holes, square holes and elliptical holes on various pipes, and can cut the phase line intersecting it at the end of the pipe. This type of equipment is widely used in the production of metal structural parts, power equipment, boiler industry, petroleum, chemical and other industrial sectors. Third, the characteristics of the cutting machine Under the premise of satisfying the cutting precision, we can talk about the speed. Because the cutting platform is short, it is difficult to judge whether it reaches the highest speed with the eyes. We can use the software simulation function of the servo drive of the cutting machine to check whether the motor speed is reached. highest. When testing the cutting speed, there is no need to cut the speed to increase the acceleration and deceleration. Each axis can be tested separately or simultaneously. Do not equip the I/0 signal and the mechanical sensor. The unnecessary switches and indicators should be as small as possible. Once a certain device on the machine fails, it will affect the use of the cutting machine. There are also fewer lines for easy troubleshooting and replacement of components, and it is best to debug the status of each I/O signal on the screen. Maintenance costs are an important factor that must be considered when purchasing a machine.
In hip joint replacement surgery, can be broadly divided into two kinds,cemented artificial hip and cementless artificial hip, due to the selection of different materials, the price is also very different.
Total cementless hip system indications
1.The main purpose of total hip replacement is to relieve hip pain,and the second is to improve hip function. The main indication for total hip arthroplasty is hip pain caused by hip lesion over 60 years old,which can not be used for other operations but only for head and neck resection.
2.Replacement surgery may be considered in patients over 45 years of age with subluxation of the hip,traumatic arthritis, pain, or loss of function.Due to the insufficient depth of the acetabulum,the upper margin of the acetabulum is inclined, which affects the stability of the acetabulum cup,and the acetabulum should be deepened or covered.
3.Indications of the need for replacement include hip pain due to loosening of the prosthesis,stem fracture,prosthesis dislocation, manual reduction failure,central dislocation caused by acetabulum wear caused by prosthesis and pain.
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Generally , the cemented type is suitable for osteoporosis, poor bone conditions, 65 to 70 years of age and older patients. The use of bone cement for artificial hip joints allows for early mobility, which is also suitable for older patients. In addition, elderly patients are generally less active, artificial joint wear is also light, replacement of an artificial joint can be, generally need less revision. The price of bone cement type artificial joint is low.
Cementless type is also known as biological fixation type, suitable for young and middle-aged patients with good bone conditions, such artificial joints have micropores or biological coating materials on the surface, bone can grow into it to achieve the role of fixing artificial joints, so it is often called biological fixation type. Cementless artificial hip joints allow their bones to slowly grow together with the artificial joint to achieve a fixed role.