Taking an example of our deliveries of vibration tables, our secondary concrete product factories has been loading — as URC products — boundary blocks and block-type retaining walls, and — as RC products — service and drainage canals, side ditches, tunnel segments, artificial reefs, and other products weighing tens of kilograms to tens of tons. For industrial machinery, we have been loading sand, powder ceramics, resin pellets, carbon, and other materials, promoting penetration in lightly salted Chinese package pickles and pickled radishes, desalting fish eggs, and the like. Our table vibrators have widely been used for testing as well and also been employed as loading testers and vibration testers for transportation.

The vibration table can be set to give the best acceleration and frequency for compacting concrete, thereby compacting concrete products with an equal, neat-surfaced finish. This compactor can greatly improve the working environment, product quality, productivity, and cost in secondary concrete product factories.

The vibration table can be set to circular or vertical linear vibration by selecting a particular type of vibrator and a method for installing it. In general, if you mount an electrical KM vibration motor or an air ball vibrator on the top frame of the table, the result is circular vibration. If you install two vibration motors or one air piston vibrator on the top frame of the table, you can obtain vertical vibration.
Both vibration modes can be used to load concrete while vibrating it. Of the two, vertical vibration is the better suited and does not move molds or allow the eccentricity of loads (workpieces). Circular vibration is suited for agitating and mixing workpieces and allows them to be used according to particular purposes.

Vibration tables basically come in two different shapes. One is a single-surface type where you mount a mold on one table and work on it, and the other is a separate type where you place two tables in parallel and place one mold on that set of two tables. The separate one is suited for long molds and similar applications, and advantageous in that it suffices to have only a small vibration table.

Vibration tables come equipped with motors capable of managing containers of various sizes and workpieces having superimposed loads of tens of grams to tens of tons. Smaller ones are air-operated vibrators to KM vibration motor types of about 30 W, while larger ones (KM series) are with separate tables of the order of 3,000 W to accommodate superimposed loads of up to 5 tons. We have once delivered hydraulic vibration tables for 20 tons of RC segments for the Tokyo Bay Aqua-Line.

The KM vibration motor series used for vibration tables are three-phase induction motors. An inverter can therefore be used to change frequency. Varying it makes it possible to set the frequency to the setting best suited for loading and mixing a particular workpiece, adjusting the frequency to finish the surfaces of a loaded material neatly, and the like, thereby satisfying our customers. Air-operated vibrators are, on the other hand, controlled by air pressure.

The top vibration frame and the bottom stand of the vibration table are generally equipped with springs, rubber damper, or air spring. Exen's air springs excel greatly in damping, resulting in efficient vibration. In addition to damping, air springs are also used as actuators for production lines. This production line functions as follows: in roller transportation lines, mold containers sent on a table are regarded as actuators and lifted with an air spring. The container is then separated from the roller, loaded by vibration, and then the air spring is lowered and the container is returned to the transportation roller and sent. This line is widely used for secondary concrete product lines.

The free weight system of the vibration table is an Exen technology where a KM vibration motor is run forward and in reverse to allow selection of two vibration force levels (a system that achieves vibrations about 60% and 100% of the standard centrifugal force). This system allows workers to do work without changing pendulum settings when there are two superimposed loads, thereby ensuring high convenience. When combined with an inverter, this product can pave the way for an even wider range of operating conditions.

As examples of optional designs that accompany our vibration tables, various operational technologies are available to ensure even higher convenience in our table vibrations, such as when the tables are frequently moved by forklift, when the rubber mold plate on the table top or the table vibrator are to be controlled by radio to protect against noise. Therefore please consult us.