Conveyors: fluid current – Pulsing fluid current
Patent
1995-01-03
1997-01-14
Pike, Andrew C.
Conveyors: fluid current
Pulsing fluid current
406 93, 406151, 15404, 37320, B65G 5366
Patent
active
055932525
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
Our invention relates to a method of and a device for suction transporting. More particularly, it relates to a transporting method and device which use a suction force for transporting solid and liquid particles by a carrying agent.
BACKGROUND ART
Suction transporting methods and devices are known in the art. In known methods and devices air and water from the environment are normally used as carrying agents. One example of this is a dry-wet vacuum cleaner in which air is used as a carrying agent for transporting solid and liquid particles. Another example is a suction dredge which uses water as a carrying agent for transporting solid particles. A known transporting method and device usually utilizes a source of suction, for example a fan driven by an electric motor, and a transporting line formed as a hollow elongated body. A suction nozzle can be attached to the front end of the transporting line and adapted to take in the carrying agent with the material to be transported. The efficiency of the transportation is determined here primarily by a magnitude of a suction force which is developed at the surface from which the material is taken in by the suction nozzle. The strongest suction force in a particular suction method and device is obtained when the edge of the suction nozzle has a good contact with the surface. However, due to a strong suction force developed by such a nozzle, it sticks to the surface and as a result it becomes very difficult and sometimes impossible to move the nozzle along the surface.
Various means are used to reduce sticking and to achieve better mobility of a suction nozzle. For example, special cuts are made in the edges of the nozzle, or the nozzle is kept elevated above the surface. When the cutting or elevating of the suction nozzle is not desirable, an adjustable slot with a valve body is made in the wall of the transporting line as disclosed, for example, in the U.S. Pat. No. 3,048,876. The above means increases the mobility of the suction nozzle, but at the same time, permanently reduces the suction force at the surface where the material is being taken, and therefore permanently decreases the efficiency of the suction transporting.
SUMMARY OF THE INVENTION
In accordance with the present invention, we provide a method of and a device for suction transporting, in which sticking of a suction nozzle to a surface is eliminated and as a result the efficiency of transporting is increased. Simultaneously, an agitating effect is created on the surface wherein the material to be transported is accumulated.
In order to achieve these objects, in our new suction transporting method a material to be transported is received in a transporting line through an inlet and discharged from it through an outlet under the action of suction created by suction means connected to the transporting line, a suction force of the suction produced in the transporting line is modulated by a passage which communicates the interior of the transporting line with atmosphere, an adjusting element which adjusts an initial area and shape of a minimal cross section of the passage, and a valve with a valve body displaced by a drive and periodically changing the initial area and shape of the minimal cross section of the passage.
These objects are also achieved by our suction transporting device which has a transporting line connected to suction means and transporting the material from its inlet to its outlet by suction, means for modulating the suction force in the transporting line and including a passage communicating the interior of the transporting line with atmosphere, an adjusting element which adjusts an initial area and shape of a minimal cross section of the passage, and a valve having a valve member which is displaced by a drive and periodically changes the initial area and shape of the minimal cross section of the passage.
When the method is performed and the device is designed in accordance with our invention, the above mentioned advantages are obtained.
BRIEF DESCRIPTION OF DR
REFERENCES:
patent: 1508521 (1924-09-01), Kreuser
patent: 3263615 (1966-08-01), Hofer
patent: 5201877 (1993-04-01), Relin et al.
Milstein Anatole
Relin Arkadi
Pike Andrew C.
Zborovsky I.
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