AVENTICS cylinder 424B03749 in stock

Brand

AVENTICS/Germany

Action Method

Other

Application Areas

Chemical, Petroleum, Mining, Road/Rail/Shipbuilding, Comprehensive

AVENTICS Cylinders

Structure

A cylinder consists of a cylinder barrel, end caps, piston, piston rod, and seals, etc. Its internal structure is shown in the diagram:

Cylinder Schematic Diagram

1) Cylinder Barrel

The inner diameter of the cylinder barrel represents the magnitude of the cylinder's output force. For the piston to slide smoothly back and forth within the cylinder barrel, the surface roughness of the inner surface of the cylinder barrel should reach Ra 0.8μm.

SMC and CM2 cylinders use a combination sealing ring on the piston to achieve bidirectional sealing. The piston and piston rod are riveted together, without nuts.

2) End Cap

The end cap has inlet and outlet ports, and some also have a buffer mechanism inside the end cap. The rod-side end cap is equipped with a sealing ring and a dustproof ring to prevent air leakage from the piston rod and to prevent external dust from entering the cylinder. A guide sleeve is also provided on the rod-side end cap to improve the cylinder's guiding accuracy, withstand a small amount of lateral load on the piston rod, reduce the downward bending of the piston rod during extension, and extend the cylinder's service life. The guide sleeve is typically made of sintered oil-impregnated alloy or forward-inclined copper casting. End caps were previously commonly made of malleable cast iron; to reduce weight and prevent rust, aluminum alloy die-casting is now commonly used, and brass is sometimes used in miniature cylinders.

3) Piston

The piston is the pressure-bearing component in the cylinder. A piston sealing ring is provided to prevent air leakage between the left and right chambers of the piston. Wear rings on the piston improve the cylinder's guiding performance, reduce wear on the piston sealing ring, and reduce frictional resistance. Wear rings are often made of polyurethane, polytetrafluoroethylene, or fabric-reinforced synthetic resin. The width of the piston is determined by the size of the sealing ring and the necessary length of the sliding portion. A short sliding section can easily cause premature wear and jamming. Pistons are commonly made of aluminum alloy and cast iron; small cylinders may use brass pistons.

4) Piston Rod

The piston rod is the most important load-bearing part in the cylinder. It is usually made of high-carbon steel with a hard chrome plating, or stainless steel, to prevent corrosion and improve the wear resistance of the seals.

5) Seals

The seals on rotating or reciprocating parts are called dynamic seals, while the seals on stationary parts are called static seals.

The main methods of connecting the cylinder barrel and end cap are: integral type, riveted type, threaded connection type, flange type, and tie rod type.

6) During cylinder operation, the piston is lubricated by oil mist in the compressed air. A small number of cylinders are lubrication-free. AVENTICS Cylinders

Folding

Problem

Cylinders are

cast. After leaving the factory, cylinders

undergo aging treatment to

eliminate the internal stresses generated during the casting process. If the aging time is short,

the finished cylinder will

deform during subsequent operation.

The cylinder experiences complex stresses during operation. Besides the

pressure difference between the inside and outside of the cylinder and

the weight of the components inside,

it also bears

the reaction force of steam flowing out of the stationary vanes on the stationary parts, and the forces exerted on the cylinder by various connecting pipes under hot and cold conditions. Under the interaction of these forces, the cylinder is prone to plastic deformation, leading to leakage.

Rapid load increases or decreases on the cylinder, especially rapid starts, stops, and changes in operating conditions, large temperature changes, improper cylinder warm-up methods, and premature opening of the insulation layer during shutdown maintenance, all generate significant thermal stress and thermal deformation in the cylinder and flanges.

Stress is generated in the cylinder during machining or after welding repair, but this stress is not eliminated through tempering. This results in significant residual stress in the cylinder, leading to deformation during operation.

During installation or maintenance, improper maintenance processes and techniques can cause inappropriate expansion clearances in the inner cylinder, cylinder diaphragms, diaphragm sleeves, and steam seal sleeves, or inappropriate expansion clearances in the lug pressure plates. This generates significant expansion forces after operation, causing cylinder deformation.

Poor quality, excessive impurities, or incorrect type of cylinder sealant can also cause problems. Hard impurity particles in the sealant can prevent a tight seal.

Insufficient tightening of cylinder bolts or substandard bolt material can also lead to issues. The tightness of the cylinder mating surfaces depends primarily on the bolt tightening. Thermal stress and high temperatures generated during unit start-up, shutdown, or load adjustments can cause bolt stress relaxation. If the stress is insufficient, the bolt preload will gradually decrease. If the cylinder bolts are of poor quality, they will elongate under thermal stress and cylinder expansion forces during prolonged operation, leading to plastic deformation or fracture. This results in insufficient tightening force and cylinder leakage.

Incorrect cylinder bolt tightening sequence can also cause problems. Generally, cylinder bolts are tightened simultaneously from the center outwards, starting from the point of greatest sag or deformation. This shifts the clearance from the point of greatest deformation towards the free ends of the cylinder, gradually eliminating the gap. If tightened from the sides towards the center, the clearance concentrates in the middle, forming an arc-shaped gap at the cylinder mating surface, causing steam leakage.

AVENTICS (Rotary Cylinder)

Ambient Temperature: Minimum/Maximum +5°C / +60°C

Minimum/Maximum Medium Temperature: +5°C / +60°C

Medium: Compressed Air

Particle Size: Max. 5 μm

Oil Content in Compressed Air: 0 mg/m³ - 1 mg/m³

Theoretical Torque: 6 bar

Materials:

Outer Shell: Aluminum, Anodized

Cover Plate: Aluminum, Anodized, Blackened

Base Plate: Aluminum, Anodized, Blackened

Sealing: Acrylic Resin

Shaft Steel: Quenched

Rotating Flange Steel: Quenched The pressure dew point must be at least 15°C below the ambient and medium temperatures, and the maximum permissible temperature is 3°C.

■ The oil content of the compressed air must remain constant throughout its service life.

■ Only oils approved by Bosch AVENTICS may be used; see the "Technical Information" section.

■ This product is a component of the EasyHandling system.

AVENTICS Rexroth Rotary Cylinders

Maximum Permissible Axial Bearing Load [N] 170 280 330 490 620

Maximum Permissible Radial Bearing Load [N] 170 300 360 580 780

Maximum Permissible Moment of Inertia [kgcm²] 0.08 0.25 0.7 1.6 3.2

Repeatability [°] 0.2 0.2 0.2 0.2 0.2

Theoretical Torque [Nm] 0.17 0.33 0.95 1.7 3

Dimensions RCM-25

Maximum Permissible Axial Bearing Load [N] 1160

Maximum Permissible Radial Bearing Load [N] 1480

Maximum Permissible Moment of Inertia [kgcm²] 6.3

Repeatability [°] 0.2

Theoretical Torque [Nm] 6.5 0822391607 0822392000 0822393000 0822394000 0822395000 0822395003 0822396000 0822397000 0822398004 0822406001 0822406900 0822411200 0822421101 0822422101 0822423101 0822424101 0822425101 0822424101 0822430201 0822431201 0822432201 0822434201 0822491001 0822492000 0822493000 0822494000 0822495000 0822495001 0822497000 0822930201 0822931204 0822932204 0822933204 0822934204 0822934201 0822955001 0822955005 0822957001 0822958001 0822959001 0830100300 0830100371 1820148009 1820209000 1820210041 1820220013 1820222013 1820311011 1820363007 1820415010 1820415106 1820455012 1820455056

AVENTICS Rexroth Rotary Cylinders

Our company mainly deals in European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, AVENTICS Rexroth, HYDAC, PILZ relays, FESTO, and IFM. Door sensors: E+H (Germany), HEIDENHAIN (Germany), P+F (Germany), SICK (Germany), TURCK (Germany), HIRSCHMANN (Germany) industrial switches; Hengstler (Germany), MURR (Germany), SCHMERSAL (Germany), SAMSON (Germany), EPRO (Germany, Emerson's subsidiary); MOOG (USA), ASCO (USA) solenoid valves, MAC (USA) solenoid valves, NUMATICS (USA), PARKER (USA), VICKERS (USA), ROSS (USA); Norgren (UK); OMAL (Italy), ATOS (Italy), CAMOZZI (Italy), UNIVER (Italy), Camozzi (Italy)