A mechanical vibrator is a device designed to generate rapid oscillations using an eccentric rotor. They are used for a wide variety of purposes, and can be both large machines (such as hoppers used in handling aggregates or vibrators used to consolidate freshly poured concrete), or small components of other devices (such as those used in smartphones, pagers or video game controls to produce a buzzing sound). The vibration is usually generated by an electric motor to which a mass is placed off-center with respect to its axis of rotation.
Vibrators as components
When smartphones and pagers vibrate, the alert buzz is generated by a small component built inside them. Many older, non-electronic doorbells and buzzers contain a component that vibrates in order to produce a sound. Tattoo machines and some types of electric engraving tools contain a mechanism that vibrates a needle or cutting tool. Aircraft stick shakers use a vibration mechanism connected to the pilots' control controls to provide a tactile warning of an impending aerodynamic loss of lift. Eccentric rotating mass (ERM) vibrators work by rotating a weight deliberately off-center.[1] Linear resonant actuators (LRA) work by repeatedly moving a weight from one side of the actuator to the other, using a coil that acts as an electromagnet.[2] The small vibration motors used in many electronic devices are shaped like a coin and are usually of the ERM type.[3][4].
Industrial vibrators
Vibrators are used in many different industrial applications, and can act as components of other machines or as machines in their own right.
Vibratory feeding hoppers are widely used in the food, pharmaceutical and chemical industries to move and place into predetermined positions bulk materials or small component parts. The application of vibration working in conjunction with the force of gravity allows materials to be moved more effectively than other methods in certain industrial processes. Vibration is also used to position small components so that they can be mechanically clamped by automated equipment, forming part of assembly systems carried out by complex machines.
Vibrating screens are used to separate mixed bulk materials into particles of different sizes. For example, sand, gravel, river rocks and crushed rock, and other granular construction materials are often separated by size using vibrating screens.
Industrial vibrators
Introduction
A mechanical vibrator is a device designed to generate rapid oscillations using an eccentric rotor. They are used for a wide variety of purposes, and can be both large machines (such as hoppers used in handling aggregates or vibrators used to consolidate freshly poured concrete), or small components of other devices (such as those used in smartphones, pagers or video game controls to produce a buzzing sound). The vibration is usually generated by an electric motor to which a mass is placed off-center with respect to its axis of rotation.
Vibrators as components
When smartphones and pagers vibrate, the alert buzz is generated by a small component built inside them. Many older, non-electronic doorbells and buzzers contain a component that vibrates in order to produce a sound. Tattoo machines and some types of electric engraving tools contain a mechanism that vibrates a needle or cutting tool. Aircraft stick shakers use a vibration mechanism connected to the pilots' control controls to provide a tactile warning of an impending aerodynamic loss of lift. Eccentric rotating mass (ERM) vibrators work by rotating a weight deliberately off-center.[1] Linear resonant actuators (LRA) work by repeatedly moving a weight from one side of the actuator to the other, using a coil that acts as an electromagnet.[2] The small vibration motors used in many electronic devices are shaped like a coin and are usually of the ERM type.[3][4].
Industrial vibrators
Vibrators are used in many different industrial applications, and can act as components of other machines or as machines in their own right.
Vibratory feeding hoppers are widely used in the food, pharmaceutical and chemical industries to move and place into predetermined positions bulk materials or small component parts. The application of vibration working in conjunction with the force of gravity allows materials to be moved more effectively than other methods in certain industrial processes. Vibration is also used to position small components so that they can be mechanically clamped by automated equipment, forming part of assembly systems carried out by complex machines.
Vibratory compactors are used for soil compaction, especially in road, railway and building foundations.
Concrete vibrators consolidate the newly poured material so that trapped air and excess water are released, ensuring that it sits firmly and without gaps inside the formwork. Improper consolidation of concrete can cause product defects, compromise concrete strength, and produce surface imperfections such as holes and honeycombing. A concrete vibrator is a steel cylinder about the size of a baseball bat handle, with a hose or electrical cord attached to one end. The head of the vibrator is immersed in the wet concrete.[5].
External concrete vibrators are fixed, by means of a support or clamp system, to the concrete forms. There are a wide variety of external concrete vibrators available and some vibrator manufacturers have bracket or clamp systems designed to fit all major brands of concrete formwork. They are available with hydraulic, pneumatic or electric power.
Shaking tables are sometimes used to test products to determine or demonstrate their ability to withstand vibrations. Tests of this type are commonly performed in the automotive, aerospace and defense industries. These machines are capable of producing three different types of vibration types: sine sweep, random vibration and shock "Shock (physics)"). In these three applications, the part under test will typically be instrumented with one or more accelerometers to measure the response of the component to the effect of vibration. A sinusoidal swept vibration profile typically starts vibrating at a low frequency and increases frequency at a set rate (measured in Hertz). The vibrational amplitude measured in gs can also increase or decrease. A sinusoidal sweep makes it possible to determine the resonance frequencies in the part under test. A random vibration profile will excite different frequencies of a spectrum at different times.[6] Important calculations are made to ensure that all frequencies are excited within an acceptable tolerance band. A series of random vibration tests can last from 30 seconds to several hours. Its purpose is to synthesize the effect of, for example, a car driving over rough terrain or a rocket taking off. A synthesized shock pulse is a short-duration high-power vibration calculated as a sum of many half-sine waves covering a range of frequencies. Its purpose is to simulate the effects of an impact or explosion. A shock pulse test usually lasts less than a second. Shaking tables can also be used in the packaging process in material handling industries to shake or settle a container so it can hold more product.
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Vibrating screens are used to separate mixed bulk materials into particles of different sizes. For example, sand, gravel, river rocks and crushed rock, and other granular construction materials are often separated by size using vibrating screens.
Vibratory compactors are used for soil compaction, especially in road, railway and building foundations.
Concrete vibrators consolidate the newly poured material so that trapped air and excess water are released, ensuring that it sits firmly and without gaps inside the formwork. Improper consolidation of concrete can cause product defects, compromise concrete strength, and produce surface imperfections such as holes and honeycombing. A concrete vibrator is a steel cylinder about the size of a baseball bat handle, with a hose or electrical cord attached to one end. The head of the vibrator is immersed in the wet concrete.[5].
External concrete vibrators are fixed, by means of a support or clamp system, to the concrete forms. There are a wide variety of external concrete vibrators available and some vibrator manufacturers have bracket or clamp systems designed to fit all major brands of concrete formwork. They are available with hydraulic, pneumatic or electric power.
Shaking tables are sometimes used to test products to determine or demonstrate their ability to withstand vibrations. Tests of this type are commonly performed in the automotive, aerospace and defense industries. These machines are capable of producing three different types of vibration types: sine sweep, random vibration and shock "Shock (physics)"). In these three applications, the part under test will typically be instrumented with one or more accelerometers to measure the response of the component to the effect of vibration. A sinusoidal swept vibration profile typically starts vibrating at a low frequency and increases frequency at a set rate (measured in Hertz). The vibrational amplitude measured in gs can also increase or decrease. A sinusoidal sweep makes it possible to determine the resonance frequencies in the part under test. A random vibration profile will excite different frequencies of a spectrum at different times.[6] Important calculations are made to ensure that all frequencies are excited within an acceptable tolerance band. A series of random vibration tests can last from 30 seconds to several hours. Its purpose is to synthesize the effect of, for example, a car driving over rough terrain or a rocket taking off. A synthesized shock pulse is a short-duration high-power vibration calculated as a sum of many half-sine waves covering a range of frequencies. Its purpose is to simulate the effects of an impact or explosion. A shock pulse test usually lasts less than a second. Shaking tables can also be used in the packaging process in material handling industries to shake or settle a container so it can hold more product.
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