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Rotary air roller vibrator
| Details |
Inventors: Wadensten, Theodore S.;
Assignee:
Primary Examiner: Simone; Timothy F.
Assistant Examiner:
Attorney, Agent or Firm: Roberts; Ralph R.
A rotary air roller vibrator is depicted in which a housing has a cylindrical bore closed by two inner end plates which form a chamber. An axial shaft is fixed between these end plates and has a longitudinally disposed slot within which is slideably mounted a vane having a plurality of formed side-opening slots that are opened when the vane is lifted under the influence of pressurized air. A cylindrical rotor having an inner diameter greater than the diameter of the shaft is also sized so that the outer diameter is carried on two races pressed into place at the ends of the housing. These races are sized to prevent the rotor from striking the shaft. Each of these end plates has outer exhaust apertures arrayed in a three-quarter circle pattern and in secured position these apertures are aligned. End covers are provided, with one cover providing a cavity for receiving air from the chamber and redirecting this air through the apertures in the plates to a space outside of the moving rotor to provide an air cushion tending to lift the rotor and induce spinning. Pressurized air forces the vane against the rotor and escapes diagonally from the slots to impinge on the rotor to induce spinning and moving the rotor against the races. The escaping air flows through exhaust holes and a conductor in the shaft and into the cavity in the end cover and returns over the outside of the rotating rotor to and through apertures in a front end plate and through exhaust holes in the second cover. The motion of the rotor is continuous and produces vibration forces due to the off-center motion of the rotor. |
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DETAILED DESCRIPTION This invention may be summarized, at least in part, with reference to its objects.
It is an object of this invention to provide, and it does provide, a rotary high-frequency vibrator with drastically reduced noise and wear of components.
It is a further object of this invention to provide, and it does provide, a rotary high-frequency vibrator particularly adapted for use in the concrete precast and prestressed industry and is sufficiently silent to meet acceptable OSHA noise level limits.
It is a still further object of this invention to provide, and it does provide, a novel and improved vibrator which is pneumatically actuated at selected high speeds.
This vibrator requires no special valves and is simple in construction and has no striking of the rotor against the fixed shaft by providing a pair of race members that are sized so as to prevent contact of the rotor with the shaft.
It is a still further object of this invention to provide, and it does provide, an improved pneumatic driven vibrator which is easy to fabricate and, if necessary, to repair.
This vibrator is quite efficient in operation in that it saves pressurized air and is a single-stage vibrator with only two moving parts and for construction requires no special tools or dies.
This vibrator is contemplated to be compact in its design and is rugged for heavy-duty applications such as shaking a railroad car to speed unloading, move stubborn materials from bins, and is ideal for all concrete which is to be precast or prestressed.
This vibratory action assists in settling concrete into forms and these vibrations make such strong and dense and void-free of air.
The concrete industry in particular has for many years, due to OSHA, tried to procure a vibration unit that produces acceptable noise levels.
The acceptable level of noise for those workplaces exposed for periods up to eight hours is 85 dB (dB readings taken at one meter on A-scale) and the vibrator of this invention produces such acceptable levels.
The vibrator of this invention has high-frequency (9,000 to 12,000) vibrations per minute, and with high force of 5,000 to 8,000 pounds of force or impact
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