Food grade fluorine rubber O-ring classification application

Food grade fluorine rubber O-ring classification application

Food grade fluorine rubber O-ring is often used in hydraulic or cylinder, what is the cylinder special rubber O-ring cylinder is a kind of performance component used in the pneumatic system, according to the different use of the premise, its structure, shape also has a variety of situations. O-ring is a mechanical gasket in the shape of a ring, which is a ring elastomer with a circular cross-section and is generally fixed in a groove, and will be compressed by two or more components during assembly, thus producing a sealed interface. How many kinds of classification methods are commonly used:

1. According to the structural characteristics of the cylinder, choose rubber O-rings: piston cylinder rubber O-rings, film cylinder rubber O-rings, telescopic cylinder rubber O-rings. Silica gel sealing ring has an open porous structure, can absorb many substances, is a good desiccant, adsorbent and catalyst carrier. The adsorption of silica gel is mainly physical adsorption, which can be regenerated and used repeatedly. Adding acid to the alkali metal silicate (such as sodium silicate) solution to acidify it, and then adding a certain amount of electrolyte to stir, that is, to generate silicic acid gel; Or adding acid or ammonium salt to a concentrated sodium silicate solution can also produce silicic acid gel.

1. Choose rubber O-rings according to the direction of compressed air on the piston end face: single-acting cylinder: the activity of the cylinder in only one direction is pneumatic transmission, the return of the piston depends on the spring force or its own weight and the rest of the external force, double-acting cylinder: the back and forth activity of the double-acting cylinder depends on compressed air to achieve

3. Choose rubber O-rings according to the device situation of the cylinder

(1) Fixed cylinder: the cylinder device is fixed on the body, with ear seat type, flange type and flange type

(2) Shaft pin cylinder: cylinder body curling around a fixed shaft can be used for a certain Angle of swing

(3) Rotary cylinder: the cylinder is fixed on the machine tool spindle and can be rotated at high speed with the machine tool spindle. This type of cylinder is often used in the pneumatic chuck on the machine tool to realize the active loading of the workpiece

(4) Embedded cylinder: the cylinder is made in the fixture body

4. Choose rubber O-rings according to the function of the cylinder

(1) Individual cylinders: including single acting and double acting cylinders, often used for occasions without special requests

(2) Buffer cylinder: one or both ends of the cylinder are equipped with a buffer device to avoid and reduce the impact of the piston to the end of the cylinder head

(3) gas-liquid damping cylinder: the cylinder and the hydraulic cylinder are connected in series, which can control the activity speed of the cylinder piston and make its speed absolutely firm

(4) Swing cylinder: used to request the cylinder blade shaft to rotate around the axis at a certain Angle, such as fixture rotation, valve opening and closing

(5) Impact cylinder: It is a high-energy cylinder with a piston rod high-speed activity to form an impact force, which can be used for stamping, cutting, etc

(6) Stepping cylinder: It is a cylinder that makes the piston rod extend out of different corresponding positions according to different holding signals

When using rubber O-rings for imported cylinders, we must pay attention to its pressure characteristics, that is, the change of pressure in the cylinder. O-ring is a mechanical gasket in the shape of a ring, which is a ring elastomer with a circular cross-section and is generally fixed in a groove, and will be compressed by two or more components during assembly, thus producing a sealed interface. The cylinder is usually divided into an intake chamber and an exhaust chamber by the piston. When compressed air is injected into the intake chamber, the exhaust chamber is in an exhaust state. When the force formed by the pressure difference between the two chambers just overcomes the various resistance loads, the piston begins to move. When there is no load, the pressure required for this initial activity is only 0.02~0.05MPa. In the process of cylinder activity, the pressure of the intake chamber gradually increases to the air source, and the exhaust chamber gradually decreases the pressure. The gas pressure in the inlet and exhaust chamber changes at any time, and its change curve is usually called the pressure characteristic curve of the cylinder.