An In-depth Analysis Of The Structural Drawings Of The Air Shaft

The working principle of an expanded core shaft relies on two key factors: gas flow and pressure control.
1) The flow of gas is achieved by controlling the size and position of the inlet and outlet ports. By changing the degree of opening and closing of the inlet and outlet ports, the flow and velocity of the gas can be controlled. The air inlet is usually located at one end of the inflatable shaft, while the air outlet is located at the other end. This design effectively maintains the direction of gas flow and ensures that the gas does not flow backwards.
2) Pressure control is the key to the work of the inflatable shaft. By changing the degree of opening and closing of the inlet and outlet ports, the resistance to the gas flow can be adjusted, and the pressure inside the cylinder can be controlled. When the air inlet is opened, the gas can flow into the cavity of the cylinder, the pressure inside the cylinder. When the gas outlet is opened, the gas can flow out of the cavity of the cylinder, reducing the pressure inside the cylinder.

The basic structure of the air expanable shaft consists of:
At the heart of the pneumatic expanded shaft is its unique inflation and deflation mechanism. In the structural drawings, we can clearly see that it is composed of key components such as shafts, airbags, air valves, key strips and locking devices. When air is inflated into the airbag through the nozzle, the airbag expands and pushes the key strip outwards to expand tightly and locks the outer paper tube or material roll; On the contrary, after deflation, the airbag shrinks and the key strip retracts to achieve rapid discharge.

Design routine demand analysis: generally consider three aspects: bearing capacity and rigidity, operation convenience, economy and applicability:
Bearing capacity and rigidity: The design of the inflatable shaft needs to fully consider its load-bearing weight and rigidity requirements, and the selected materials, the size of the shaft diameter and the design structure of the shaft diameter are important factors affecting the load-bearing capacity. By selecting high-hardness steel and determining the size of the shaft diameter according to customer needs, it ensures that it is not deformed or damaged when carrying heavy objects. At the same time, reasonable structural design, such as the design of the shaft diameter with a large middle and small ends, as well as the chamfering treatment of the shaft end and journal, can help to improve rigidity and reduce stress concentration.
Ease of operation: The design of the inflatable shaft pursues easy and fast operation. Through a simple inflation and deflation operation, the paper core or material roll can be quickly locked and released, which greatly improves the production efficiency. In addition, each part on the inflatable shaft should have a fixed specification for easy interchange and repair. At the same time, its wide ring width design ensures smooth rotation and low friction, thus simplifying the process of loading and unloading.
Economy and applicability: The inflatable shaft needs to have a wide range of applicability, and can be suitable for different thicknesses, widths, and lengths of paper tubes or material rolls. At the same time, it should be designed with cost-effectiveness in mind, reducing costs by optimizing material use, reducing processing volume, etc.

Through drawing design, we focus on optimizing the problems that are prone to occur during the use of inflatable shafts:
1) Air leakage: Air leakage is one of the common faults in the use of inflatable shafts, which directly affects the normal operation of the equipment. In response to this problem, it is necessary to regularly check the tightness of seals, air valves, hoses and other components, and replace damaged parts in time. At the same time, high-quality sealing materials and advanced sealing technologies, such as mechanical gluing or electron beam gluing technology, are used to improve sealing performance.
2) Uneven loading: In the winding process, if the material thickness is uneven or the machine tension control is unstable, it may lead to uneven load of the inflatable bearing and affect the winding quality. At this time, the natural fragment can be used to run the inflatable shaft, and the fragile nature of the metal shell under extremely high stress deformation can be used to form the optimal distribution of fragment size and speed, so as to solve the problem of uneven loading.
3) Inconvenient disassembly and assembly: The convenience of disassembly and assembly of the inflatable shaft directly affects the production efficiency and equipment maintenance cost. Therefore, the optimization of the disassembly and assembly process needs to be fully considered in the design, such as the use of modular design, standardized parts, etc., so as to make the disassembly and assembly process more convenient and fast.
4) The accumulation of gas leads to the phenomenon that the mechanical bearing temporarily fails or cannot work normally: the gap between the designed bearings is too large or too small, so that the gas is easy to enter or accumulate in the bearing, which causes the inflatable shaft to work normally, so in the design drawings, it is necessary to pay attention to the rationality of the bearing structure and bearing clearance design, and avoid the bearing being too large or too small.

Inflatable shafts, including slatted inflatable shafts, keyed inflatable shafts, and multi-balloon inflatable shafts, have a wide range of applications in several industries. Each of these three inflatable shafts has its own characteristics, but they are frequently used in industries such as lithium battery separators, copper foils, optical films, textiles, printing, papermaking, and packaging. It is easy to operate, simply inflating the valve on the inflatable shaft and easily holding against external components such as round paper tubes. When it is necessary to unload, it can be easily taken out by simply pressing the parts on the air noveil, which greatly reduces the labor intensity compared with the traditional mechanical loading and unloading method.

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(Over 20 years experience in air shaft production )