Types of Vibration Table

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The vibration table is usually used for the vibration of cement concrete, prefabricated parts, etc., to reduce the air and gaps in the material, and make the parts more solid and beautiful.

There are several types of vibration tables, each designed for a specific application. Here are some of the most common types:

1. Two-dimensional vibration table

Two-dimensional vibration table is a kind of vibration table that can generate vibration in two directions, usually horizontal and vertical. It is currently widely used in industries such as concrete molds, cement prefabricated parts, civil air defense doors, and ton bag packaging.

2. Three-dimensional vibration table

The three-dimensional vibration table adopts a combination of rubber springs and 4-8 vibration motors, which can generate vibrations in three directions, usually vertical, horizontal and rotational, and is mainly used for molding resin sand and lost foam. The vibration motor drives the body Vibration fully compacts the sand and fills the mold.

In addition to the above two types of vibration tables, there are also specific vibration tables designed for industries:

1. Vibration table for casting

Used in the foundry industry to remove air bubbles and improve the flow characteristics of cast materials such as concrete, plaster or resins. A vibration table for casting usually consists of a platform mounted on a base with adjustable amplitude and frequency controls. The vibration table produces controlled vibrations as the casting material is poured onto the platform, helping to remove air bubbles and improve the flow properties of the material. This ensures that the casting material fills all voids and cavities in the mold and produces a high quality casting.

2. Vibration table for concrete

Vibration table is commonly used in the concrete industry to improve the compactness and consolidation of concrete, help to remove air bubbles, and improve the overall strength and durability of concrete. Concrete vibration tables usually consist of a platform mounted on a base with adjustable amplitude and frequency controls.

When fresh concrete is poured onto the platform, the vibration table produces controlled vibrations that help remove air pockets and improve concrete compaction. This ensures that the concrete fills all voids and cavities in the mold and produces a high quality, dense concrete product.

3. Laboratory vibration table

is a vibration teble designed for scientific research and testing applications. It is commonly used in a variety of fields, including materials science, mechanical engineering, and civil engineering.

In general, the choice of vibration table depends on the specific application and the type of vibration that needs to be generated. By choosing the right type of vibration table, manufacturers can simulate the effects of vibration on their products and structures and identify any design flaws or weaknesses.

Vibrating tables are found in many industrial processes, especially where powders and granulated dry materials are being handled.

They are also useful for removing entrapped air from liquids in casting applications, ensuring a uniform and complete void-free filling of the mould.

The vibration is made possible by special motors that have a weight mounted eccentrically, to throw the torque off balance. The centrifugal force from this &#;eccentric rotating mass&#; (ERM) translates the rotary motion into an up-and-down / side-to-side oscillation. A &#;3-D&#; multidirectional vibration or unidirectional vibration can be produced to suit the application, depending on the number and configuration of motors installed.

Vibrating tables are used in many packaging, testing and casting processes, whilst vibrating motors can be designed and built into other machines that require sections such as conveyors, hoppers, beds or tanks to vibrate.

Examples of vibration in different applications

Concrete product manufacture

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The proper compaction of concrete is essential in controlling the uniform quality, density and strength of pre-cast concrete items such as pavers, posts, lintels, and beams. Vibrating the mould during the pour eliminates voids and air pockets, producing a solid and compact component with predictable strength.

Resin and plaster castings

Air bubbles can form in casting resins and plasters, either from the physical mixing stage or from off-gassing during product cure. Working on a vibrating table helps release these bubbles early on, preventing problems with aesthetics and performance in the finished article.

Metal foundry casting

Vibration tables can speed up and improve the process of making iron castings from foundry, or &#;green&#; sand. By compacting the loose sand into every gap, the accuracy and finish of the subsequent casting is better.

Filling or emptying packaging or containers

Vibration speeds up the moving of bulk material from one vessel to another, and reduces wastage. Shaking out the material prevents clumping and bridging, enabling rapid, uninterrupted and complete emptying. Vibrating the packaging as it is filled, densifies and settles the material, allowing for full container loads which reduces transport, packaging material and storage costs (typically up to 20%-25%) when compared to non-settled filling.

Fatigue Testing

Accelerated aging and fatigue testing means a prototype can be tested against a standard or existing product to see how it reacts to multiple shocks and strain. It enables iterative engineering improvements by identifying weaknesses in structures.

Frequency, displacement, velocity and acceleration

The frequency and amplitude can be varied by the RPM (speed of motor) and the mass and distance from the shaft of the eccentric weight. Displacement and acceleration are largely down to motor size choice.

The vibration force can be calculated as shown in the formulas below:

Frequency (f) = RPM/60
Force = mass of the weight x weight&#;s distance from centre of shaft x f2

Basically, in simple terms this means the heavier the weight, the further off-balance it is, and the faster it spins&#;the greater the vibration.

Summary

Understanding and controlling vibration is important to many industrial machinery applications. Whilst unintentional vibration can cause (or signal) issues with rotary equipment, vibratory power can be harnessed to help move and process many challenging materials.

Vibration tables are workbenches for performing tasks that benefit from a powerful and controlled vibrating action. By engineering the characteristics of the vibrating motor, the table vibration can be matched so suit the application&#;s requirements.

Find out if a new vibration table, or an upgrade to your existing table&#;s vibrating motor configuration could revolutionise your workflow and output. Provide an overview by clicking here free of charge and we&#;ll give you access to our vibrating table solutions finder.