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Sensors are a means of providing feedback to a control system, so that the operating parameters of an application can be continually adjusted for optimal results. Pneumatic cylinder sensors can be used to measure various parameters. Their typical function in pneumatics is to detect the position of a pneumatic cylinder during its operation by means of proximity switches.

What Is A Pneumatic Cylinder Sensor?

The phrase “pneumatic cylinder sensors” usually refers to position sensors, which are important in applications where the piston’s linear position is critical. Position feedback is provided by sensors mounted on the cylinder. It’s passed to the control system so that it can make necessary operational adjustments. Sensor proximity switches can be of an inductive mechanical type, but more common is a magnetic proximity switch and position transmitter connected to a control system.

WHAT ARE PNEUMATIC SENSORS USED FOR?

The sensors deliver electrical signals via a transmitter, reporting the piston’s position to a control system. The feedback provided by position sensors offers an additional layer of security, ensuring that the piston is ideally placed to drive crucial applications.

Types Of Pneumatic Sensors

Pneumatic cylinders also use other sensors, including those measuring airflow and pressure, but we’re focusing on position sensors. Of these, magnetic proximity sensors are probably the most common type. They’re mounted onto the cylinder body, where they can detect the magnetic field generated by the piston’s integral magnet. They indicate its proximity by relaying an ON or OFF signal to the control system.

The sensors can be mounted in various positions on the cylinder body to detect extension and retraction of the piston. They can also be mounted at one or more specific positions for more precise sensory input. The type of sensor you choose and the way they’re mounted will depend on whether you have a round or a rectangular (profile) cylinder body.

(from Internet)

CONGLATULATION!

The "Internal Pilot Guide of the Precision Pressure Reducing Valve" standard  which was lead drafted by our company has been approved by the Zhejiang Product Quality Association as the "Quality Criterion" for  the zhejiang manufacturing  groups' standard, the Code Number is T/ZZB 1619-2020, which will be implemented from July 30, 2020.

Tubing type

Tubing and hose may seem to be the same, but tubes are designated by their external diameter so as to be compatible with push-to-connect fittings. Hose is designated by its internal diameter, and usually comes with rigid, swivel or quick-disconnect fittings that are attached at both ends. Pipes are entirely rigid, constructed from a single solid material and usually defined by their internal diameter dimension.

Tubes are relatively rigid vessels generally made from one solid material, typically some kind of thermoplastic, which can also be internally reinforced for higher strength:

• Nylon is light, tough and dimensionally stable, with low water absorption and high resistance to flexural fatigue.

• Polyurethane is flexible, strong, resistant to abrasion and kinks and can also withstand contact with oils and fuels.

• Polyethylene and high density polyethylene (HDPE) are widely resistant to solvents and chemicals, and relatively cheap with good flexibility.

• Polypropylene withstands UV radiation, is resistant to chemical attack and can be formulated for use in food-contact applications.

• PVC and CPVC (chlorinated polyvinyl chloride) is light and usually more flexible than polyethylene or nylon, with a good resistance to chemicals, and can sustain repeated sterilisation. It is also usually transparent, enabling visual confirmation of flow.

Hoses are completely flexible vessels constructed from a variety of the same thermoplastic materials. An inner tube is reinforced with one or more layers of spiral-wound or braided fibres, with a protective outer cover. Hose is generally more expensive than tubing but is more rugged and durable, as it is often used for manual tools and gets dragged across abrasive surfaces.

 

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Post time:        Apr-02-2022

Working environment

The design of pneumatic fittings should allow the free flow of required air or gas without any opportunity for significant drops in pressure. Pipes and hoses should be configured as simply as possible, so that no energy is lost in the air’s passage through the system. Always use straight runs wherever possible, and only use elbows and Ts if absolutely necessary.

When choosing your pneumatic fittings, there are some key environmental factors that must also be taken into account.

OPERATING TEMPERATURE

The operating temperature specified by the manufacturer defines the range of temperatures or the operational temperature ratings within which the particular fitting is designed to work. This is measured in degrees Celsius (°C) or degrees Fahrenheit (°F), and the fitting may well fail if it is made to operate above or below this specified range. It must be borne in mind that the ambient temperature of the inlet air to the compression unit will affect the compressed air output.

As air heats up or rises the pressure drops, so industrial automation equipment should generally only be used in a controlled temperature environment. In general terms, every 5º F of temperature reduction produces a 1% improvement in efficiency and power conservation, but both high ambient air temperature and low intake pressures will significantly affect performance. It’s also a fact that an increase in operating temperature will cause a reduction in the operating pressure of polyurethane and nylon tubing.

CONTAMINANTS

The most common air contaminants are water, oil and particulates, such as dirt, rust and metal shavings. Such contaminants in the air intake are commonly removed by the filtration system, usually comprising a filter-regulator-lubricator unit (FRL). The lubricant also acts as a coolant in some types of compressor, but there is sometimes a danger of the heated lubricant getting back into the inlet air and causing contamination there. Additional contaminants in the form of bacteria or microorganisms can also be critical in some types of application, such as pharmaceuticals or food.

PHYSICAL SPACE

It seems simple, but it is essential to ensure that there is sufficient space around the installation to allow the best configured construction, as well as access for maintenance and repairs. It should be large enough to allow pipework to run naturally, and to permit a free flow of ambient air so the space doesn’t overheat externally. The equipment also needs to be stable with no possibility of vibration.

Advantages of pneumatic components:  

1. Pneumatic device is simple in structure, light and easy to install and maintain.  The medium is air, which is not easy to burn compared with the hydraulic medium, so it is safe to use.  

2, the working medium is inexhaustible air, air itself does not cost money.  Exhaust treatment is simple, no pollution to the environment, low cost.  

3. It is very easy to adjust the output force and the working speed.  The speed of the cylinder is generally less than 1M/S, which is faster than the speed of the hydraulic and electrical modes.  

4, high reliability, long service life.  The service life of effective action of electrical components is about one million times, and the life of the general solenoid valve is more than 30 million times, some good quality valves more than 200 million times.  

5, air compressibility can store energy, to achieve centralized air supply.  The energy can be released in a short time to obtain a high speed response in intermittent motion.  It can be buffered.  Strong adaptability to impact load and overload.  Under certain conditions, the pneumatic device can be self-sustaining.  

6, full pneumatic control is with fireproof, explosion-proof, moisture-proof ability.  Compared with hydraulic mode, pneumatic mode can be used in high temperature occasions.  

7, because the air flow loss is small, compressed air can be centralized supply, long-distance transportation.

Disadvantages of pneumatic components  

1, because the air has compressibility, the speed of the cylinder is subject to changes in load.  This defect can be overcome by gas-liquid linkage.  

2. When the cylinder is moving at low speed, the low speed stability of the cylinder is not as good as that of the hydraulic cylinder due to the large proportion of friction in the thrust.  

3, although in many applications, the output force of the cylinder can meet the work requirements, but its output force is smaller than the hydraulic cylinder.  

DIFFERENT TYPES OF FITTINGS

Fittings come in all shapes and sizes, and can be connected in a variety of ways. Shaped fittings ensure the effective design of a pneumatic system, with various unions and adaptors to reduce or increase the pipe diameter, or provide a neat continuity across fittings.

The most common types of connection are:

Compression

Compression fittings rely on compressive force to connect, and need no soldering to install. There are several ways to compress the fitting and most need no tools, but rely on a ferrule, ring or metal gasket to make the seal. Some types require a nut to be tightened, while others have a sharpened ferrule which bites the tube when compressed.

Threaded

Threaded fittings have screw threads on the outer (male) or inner (female) surfaces, so that they can match other threaded fittings. Straight threads are the simplest, but tapered threads provide a better seal.

Push-In

Push-in Fittings allow the tube to be secured by pushing it through a collet or grab ring and can be released simply by pushing a release collar.

Push-on (barbed)

The tube is pushed as far as it can go over a barbed end on the fitting, and secured by tightening a nut onto the combined assembly.

T-shaped

A T-shaped intersection connects three flow sections, allowing flow to be split apart or combined. Cross-shaped fittings do the same for four flow sections.

Elbow

Elbow fittings change the flow direction at various angles without the risk of tube kinking. The most common elbow angles are 45° and 90°, but elbows also exist in 22.5°.

Reducer

Reducer fittings connect two or more conduits of differing sizes.

 

 

 

From Internet

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Post time:        Apr-02-2022

One of the important parts of the pneumatic components is the cylinder. In order to ensure the normal use of the cylinder and avoid unnecessary situations, for the use of the pneumatic components and cylinder, let’s check the right way to use cylinder. When using the cylinder, the air quality requirements are very high. Clean, dry compressed air should be used. The air should not contain organic solvents, synthetic oils, salts, corrosive gases, etc., in order to avoid bottle and valve failure.