Self-made and Application of Single Machine Air Diaphragm

The single-sided machines in the domestic and international cardboard production lines are mainly controlled by pneumatically controlled corrugating rollers. The pressure between the rollers of XDV-1030 single-sided machine is achieved by the action of four cylinders distributed on the upper corrugating roller and the pressure roller. The pressure is adjusted according to the actual needs through the control valve and meter on the control panel.
1. The action of the air diaphragm cylinder is achieved by the compressed air through the air diaphragm in the cylinder. The air diaphragm is referred to as the airbag. It is a diaphragm type widely used in hydraulic and pneumatic devices and can convert the uniform pressure transmitted from the compressed air into The thrust acting continuously on the cylinder connecting rod is used to adjust or maintain the gap between the corrugating roller and the pressure roller so that the production can be performed normally and continuously.
The airbag is a cylindrical cylinder with a slightly rounded bottom with a diameter of 178 mm. The upper end of the seal is open at the lower end and is 130 mm high. The wall thickness of one side is approximately 0.75 mm. A layer of rubber is applied to the inside and outside, and a layer of rubber is sandwiched between them. With good folding and sealing properties, it can deliver 6-12kg/cm2 pressure. If there is a slight leak during use, it will affect the quality of the product or directly interrupt single-sided machine production. Therefore, the airbag is a very important and vulnerable part.
Second, trial preparation technology research balloon requirements:
(1) Keep airtight throughout the entire journey;
(2) Ability to withstand a certain pressure, temperature and lubricating oil;
(3) should have good folding and long life;
(4) Relatively reasonable price.
Airbag material requirements:
(1) Under a given pressure, the rubber should have sufficient strength, elasticity, impact resistance and wear resistance. No material fatigue during dynamic loading;
(2) Good rubber processing performance, good fluidity, convenient vulcanization conditions, and easy adhesion to woven fabrics;
(3) At the maximum working temperature, the rubber is neither soft nor hardened, nor is it fractured due to climatic conditions. Mold requirements: Due to the limited number of air bags, the mold must be simple and practical. Taking into account the convenience of mold manufacturing, reducing the operating strength and process needs and other factors, it is specially designed as an upper, middle, and lower three-segment fitting type. In order to ensure that the rubber coating layer does not leak, the initial unilateral wall thickness is 1.5mm.
Third, the test phase 1. Rubber to determine two kinds: anti-aging and flame-resistant, suitable for contact with air in the use of neoprene and oil resistance, suitable for compressed air nitrile rubber.
2. Use batches of different grades of rubber and braids of different thicknesses such as cord fabrics and nylon fabrics for comparative tests.
3. Explore the basic process flow.
4. Lessons learned:
Cloth lessons:
(1) airbags do not clamp cloth can not be used normally;
(2) The cloth can't sculpt narrow strips of sticky rubber, otherwise the cross overlap is thick and hard, which directly affects the effect; at the same time, the narrower the cloth is, the more seams are, and it is easy to produce leaks and increase the processing difficulty;
(3) The cloth is integrated as much as possible. At present, the two-piece connection is to be sewn together with small stitches before the adhesive is attached. Note the flatness of the seam.
Mold defects:
(1) The intersection between the upper and middle molds is the use of the folds, and about half of the leaks are distributed within the left and right seams within 6mm, so the joints must be moved downwards;
(2) The seal groove is shallow, and the cover plate is easily removed, resulting in uncontrolled parking; two 0.7mm seal wires are meaningless in practical use and can be considered simplified;
(3) The size of the bottom mold plastic tank is not large enough;
(4) The centering of the mold should be simple and reliable, so as to prevent the micro-movement of the micro-size during vulcanization setting, which will cause the wall thickness to be significantly uneven. The thin part is often the place where the exchange occurs;
(5) The mold transition radius is too small, resulting in a thicker airbag fillet, higher hardness, and easily damaged or cracked during folding.
In addition, the wall thickness of the airbag should be less than 1.5mm, and the glue hardness should be 30-35 degrees Shaw.
Fourth, the official use 1. Rework the mold due to the first set of mold problems, can not be modified to meet the requirements. After processing a set of molds, the transition radius is changed from R10mm to R20mm, and the overflow rubber groove is expanded to R1.5mm. The sealing groove is changed to be more convenient and practical. The upper middle mold joint is moved down by 25mm and the wall thickness of the airbag is set to 1.3mm. .
2. Practical statistics Imported spare parts were all used up in 1992 but no original records. It is estimated that 3 to 5 will be updated each year, and the number of repairs will not be less than 5 times per year. The self-made parts were never repaired due to low cost (80 yuan each), and were changed from bad to bad. From the initial period of more than 50 to 15 each year after 1997, the quality of the parts was obviously improved and basically achieved the desired purpose. .