1. Field of the Invention
This invention provides an air amplifier for use as an apparatus and in a method for filling a flask of a molding machine, whereby sand particles originally falling into the flask only by gravity are now accelerated upon exiting amplifier nozzles. The accelerated sand particles are directed or slung (as in sand slinger) toward a pattern plate and flask mounted within a molding machine.
2. Discussion of Related Art
Some conventional molding machines use gravity feed systems to fill a cope flask and a drag flask with sand. During the fill procedure, green sand is loaded into a measuring hopper. The hopper is then opened and the sand falls by gravity into and fills a space defined by the flask and a pattern plate.
In other conventional molding machines, sand is pneumatically blown into a void/space defined by a flask and a pattern plate. In some, if not all, pneumatically blown fill processes, a seal is formed between the flask and the device that feeds the pneumatically blown sand. Flasks used with a pneumatically blown filling device require a vented structure, such as one or more screens or vents, so that air can discharge from the flask without carrying the sand outside of the flask. The seals and also the vented flasks require undesirable maintenance, for example to keep the vents open and properly operating. Machines of this closed fill design also do not provide the flexibility or access that is desired in the production of many castings, such as, for example, the use of chaplets, ram up cores, exothermic risers, etc.
It is one object of this invention to provide an apparatus for filling a cope flask and/or a drag flask of a molding machine by using nozzles to accelerate and direct sand particles into a void formed by a flask structure.
It is another object of this invention to provide a method for filling the cope flask and/or the drag flask in a timely manner, to achieve better time and motion efficiency of the molding machine.
The above and other objects of this invention are accomplished with a distribution apparatus mounted upstream with respect to a flask to be filled. The distribution apparatus has a plurality of nozzles, such as, for example, air amplifier nozzles, that can receive sand, for example gravity fed sand, and distribute the sand into the different nozzles. The nozzles can be arranged in any suitable pattern or array, depending upon the intended use or the type of pattern mounted within the corresponding flask.
Each nozzle can have a pressurized fluid, such as air, flowing through a passageway of the nozzle. The pressurized fluid passes through openings within the nozzle and increases the velocity of fluid flowing through the nozzle. In one embodiment, the nozzles include a pressurized fluid inlet, a Coanda profile, and/or a mixed fluid outlet.
As the sand falls by gravity from a hopper, the sand enters an inlet of each nozzle. The pressurized fluid flowing through the nozzle draws the sand into and through the passageway of the nozzle and accelerates the sand as it travels through the passageway of the nozzle. The sand discharges through an outlet of the nozzle and is directed toward a void formed by the flask.
Any nozzle can be adjustably mounted with respect to the mold or the flask, so that the flow of accelerated sand can be directed or aimed into the void of the flask. For example, any one or more of the nozzles can be aimed at or near a pattern mounted within the void of the flask.
The accelerated sand particles can provide denser compaction and/or more uniform compaction of the sand about the pattern, and can desirably reduce or eliminate, for example, the need for conventional hand ramming to achieve the desired mold quality.
A computer, controller or other calculating device can be programmed and used to achieve different flow parameters of the sand through the nozzle, and also to change the position of each nozzle with respect to the flask.
Upstream of the nozzles, funnels or funnel inlets can be used to distribute the gravity fed sand into corresponding nozzles. Each funnel or funnel inlet can have a shape of a truncated cone, for example that converges in a direction toward the corresponding nozzle. The funnels or funnel inlets can be positioned next to each other to reduce or eliminate horizontal surfaces that would otherwise catch or collect sand and interfere with distribution and/or flow of the sand.
The above and other features and objects of this invention are better understood from the following detailed description taken in view of the drawings, wherein:
Molding machine 20 of this invention can be used in connection with molding technology, including molds that use green sand. U.S. Pat. No. 6,622,772, the entire disclosure of which is incorporated into this specification by reference, describes background technology that could be applied to this invention.
Particles 21 may comprise green sand normally used with molding machines, or any other suitable sand or other particulate substance that can be used in molding machine 20.
As shown in
In certain embodiments of this invention, distributor 39, which receives and discharges particles 21, comprises nozzles 40 and/or structural elements directly or indirectly connected or attached to nozzles 40. As shown in
Pressurized fluid 25 can comprise any suitable gas or liquid used to carry particles 21. For example, pressurized fluid 25 can be pressurized air or any other pressurized gas.
Pressurized fluid 25, such as shown in
The acceleration and thus the increased velocity of particles 21 can provide better or denser compaction and/or more uniform compaction of particles 21 about, at or near pattern 36 or 37.
In certain embodiments according to this invention, each nozzle 40 is attached to plate 50.
A downstream end portion of nozzle 40 can be attached to plate 55. Downstream end 43 can be mounted within bore 56 of plate 55, such as shown in
One common space 58 can be used to provide pressurized fluid 25 to each nozzle 40. In other embodiments according to this invention, space 58 can be divided into two or more separate portions, such as by using one or more baffle structures or any other suitable valving arrangement. Manifold 60, such as shown in
Controller 70 can be programmed or otherwise used to determine at least one flow parameter at which pressurized fluid 25 is delivered to each of nozzles 40. Controller 70 can emit a signal to a control device, such as a control valve shown in
As shown in
One or more nozzles 40 can be adjustably mounted with respect to mold 30, including cope flask 31 and/or drag flask 33. For example, nozzle 40 can have a gimbal mount adjustably positionable with respect to cope flask 31 and/or drag flask 33, that provides rotational movement about one or more of three different axes. A gimbal mount can be used to position or aim nozzle 40, for example at or near pattern 36 or 37 positioned within void 32 or 34.
In certain embodiments according to this invention, in addition to or in lieu of the gimbal mount, at least one nozzle 40 can be moveably mounted or positionable with respect to cope flask 31 and/or drag flask 33. For example, nozzle 40 can be manually and/or automatically, such as through a programmed robotic control, moved in any one or more of three dimensions. Each nozzle 40 can be moved and/or repositioned by using any suitable programmed controller and a positioning device.
As shown in
Nozzle 40 can also be referred to as an accelerator or an acceleration device. In some embodiments of this invention, each nozzle 40 is an independent structure. In other embodiments of this invention, two or more nozzles 40 are combined to form one structure or housing. For example, two or more nozzles 40 can be formed as bores or passageways 48 through a single or integrated structural element.
Downstream end 43 of distributor 39 and/or a downstream surface of plate 55 can be spaced at a distance from an upstream surface of mold 30, including cope flask 31 or drag flask 33. The distance can be sized to form an opening or a gap that sufficiently allows pressurized fluid 25 to escape from within void 32 or 34, such as when particles 21 are discharged from nozzle 40.
In one embodiment according to this invention, a method for transferring particles 21 into void 32 or 34 includes passing particles 21 through two or more nozzles 40, each mounted with respect to molding machine 20, mold 30 and/or cope flask 31 or drag flask 33. Pressurized fluid 25 is drawn into or passes through each nozzle 40 and thus accelerates particles 21 within or through passageways 48 of nozzles 40. Particles 21 are then discharged through outlet 44 of each nozzle 40, and into void 32 or 34, at or near pattern 36 or 37. Any flow parameter through nozzle 40 and/or any position of nozzle 40 can be varied, for each particular use or even as a function of time, and can be controlled manually and/or automatically, to accomplish any desired continuous or intermittent transfer of particles 21 into void 32 or 34.
In certain embodiments of this invention, pressurized fluid 25 establishes or creates a Coanda effect where a fluid stream follows or attaches to an inner surface of nozzle 40. For example, as shown in
While in the foregoing specification this invention has been described in relation to certain preferred embodiments thereof, and many details have been set forth for purpose of illustration, it will be apparent to those skilled in the art that the invention is susceptible to additional embodiments and that certain of the details described herein can be varied considerably without departing from the basic principles of the invention.
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Number | Date | Country | |
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20080023171 A1 | Jan 2008 | US |