1. Principle:
Round holes are regularly distributed on the surface of the gas expansion shaft, and the outer platen is fixed on the inner platen by screws and support columns. When there is no compressed air, the internal spring force will press the inner pressing plate on the surface of the air bag, and the key strip is flush with the surface of the shaft. At this time, install the paper tube or other tubes, and then inject compressed air into the axial air bag to expand the air bag, jack up the inner pressing plate in the tube, and fix the paper tube or other tubes. With the rotation of the air expansion shaft, the film, sheet, fiber, etc. can be wound on the paper On a pipe or other pipe.
characteristic:
1.1 wide range of applications: as an independent design part, the air expansion shaft ranges from 1 inch to 12 inches, and the length, size and ends of the shaft head are determined by the actual needs of customers. This air expansion shaft can be applied to the equipment such as striped printing, rewinding, coating, laminating, bag making, papermaking and other related central coiling machines.
1.2. Economical and efficient: the shaft is designed for practical work and can be applied to all kinds of coiled pipes
1.3. Long service time and simple maintenance: Although the air expansion shaft is a mechanical accessory, it has every part in its own structure
All parts have fixed specifications. The surface of the parts is generally treated by oxidation / chromium plating / nickel plating to increase the surface wear resistance and reduce the friction. The parts can be used interchangeably to make the maintenance convenient.
1.4 single accessory: the air expansion shaft is a single accessory of the winding and unwinding machine, and each part in its structure has a fixed gauge
Grid size, can be decomposed and combined, so that easy maintenance, durable surface
1.5 large bearing capacity: the air expansion shaft can be designed according to the actual model, using high-quality materials to increase the bearing capacity. Aluminum alloy material can be used for light weight, and steel material can be used for bearing more than 1 ton.
1.6. Short operation time: it only takes 2 seconds to separate and place the coiled tube, and it is easy to place the coiled tube
All machines and equipment used for winding and unwinding can be used for air expansion shaft.
1.7. The expansion of the strip expansion shaft is the whole piece of outer pressing plate. The fulcrum is evenly distributed and the force is balanced. It is suitable for machinery with high winding precision or articles with light winding
2. Common specifications:

3. Structure description:
2.1 strip material: aluminum alloy, 4 pieces / 6 pieces, natural color / Brown oxidation treatment can be selected according to the use requirements.
2.2 the material of shaft body is divided into carbon steel, aluminum alloy, carbon fiber, etc., and it is selected according to the bearing requirements.
2.3 shaft head structure at both ends: customized processing according to different equipment needs, common flange, optical shaft, key shaft, square head, triangle head, cone head, internal tooth head, etc.
2.4 types of gas filling nozzle: it is divided into two kinds of structure: sharp bell mouth, G1 / 4, G1 / 8 and G1 / 16 specifications for each size, and ordinary type and extended type for each length.
2.5 distribution of the number of filling nozzles: single nozzle / multiple nozzles can be selected, which are distributed in the outer circle of shaft / outer circle of shaft head / end face of shaft head.

4. Explosion view: