BACKGROUND OF THE INVENTION Generally, a conventional powder feed valve is constructed to selectively exhaust power supplied via an inlet 1 1 through a first exhaust 13 or a second exhaust 14 by means of a rotary valve 12, as shown in Fig.).

The conventional powder feed valve, however, does not have a supply line penetrating the inlet ! 2 and the first and second exhausts 13 and 14 through which power can be smoothly feed. Thus, there is a problem that powder is always stacked in a given reaion of the supply line. As such, as the power is continuously remained in a given region, a aven amount of power could not be feed through this powder feed valve. Therefore, there is a problem that a desired product could not be made.

Also, in the conventional powder feed valve, as the power is remained in a rotary valve 12 for selectin the feed direction, the rotary valve I does not exactly select the feed direction of the powder. As such. if the rotary valve 12 does not select the exact feed direction either the first exhaust

13 or the second exhaust 14 could not be completely sealed. Thus, as the power will be exhausted via both the two first and second exhausts 13 and 14, there occurs a problem that a desired amount of material is not exactly supplied for manufacturing a product.

Meanwhile, for the purpose of smooth feed of the powder, there has been made an attempt to manufacture a powder feed valve of a large quantity in which the dimension of the valve is great. However, this only increases the size of the apparatus but still has the above-mentioned problems.

SUMMARY OF THE INVENTION The present invention is contrived to solve the above problems and an object of the present invention is to provide a powder feed valve capable of facilitating the feeding of power and improving an internal seal propertv, by selectively feeding the power supplied via an inlet to slide it along a connection tube formed in the same direction to a feed direction.

In order to accomplish the above object, a powder feed sliding valve according to the present invention comprises a body to one side of which is connected an inlet flange for introducing power and the other side of which is connected a plurality of exit flanges for exhausting powder; a sliding block mounted within the body and having a connection tube that can be connected to the inlet flange, the sliding block selecting one of the exit flanges while sliding right and left; and a cylinder for feeding the sliding block right and left.

Also, there is formed gaskets for preventing leakage of power, which are mounted at a connecting portion of the body to which the inlet flange and the plurality of exit flanges are connected, respectively.

Further, there is formed a slant portion slanted from the inside to the outside around the internal bottom gasket and is formed a plurality of air exhaust slots within the gasket along its length direction so that loading of the body onto the gasket is facilitated.

In addition, there is formed a guide home for facilitating support and movement of the sliding block at the bottom center of the body and is a guide projection sliding along the guide home at the bottom of the sliding block.

BRIEF DESCRIPTION OF THE DRAWINGS The aforementioned aspects and other features of the present invention will be explained in the following description, taken in conjunction with the accompanying drawings, wherein: Fig. 1 is a schematic diagram for illustrating an internal shape of a conventional powder feed valve, Fig. 2 is a developed view of a powder feed sliding valve according to a first embodiment of the present invention, Fig. 3 is a schematic view of the powder feed sliding valve according to the present invention shown in Fig. 2, Fig. 4 is a cross-sectional view taken along lines A-A'of the powder feed sliding valve according to the present invention shown in Fig. 3,

Fig. 5 is a schematic view of a circular gasket in the powder feed sliding valve according to the present invention shown in Fig. 2, Fig. 6 is a cross-sectional view taken along lines B-B'of the circular gasket shown in Fig. 5.

Fig. 7 is a schematic view for explaining the state in which an inlet of the powder feed sliding valve shown in Fig. 2 is sealed, Fig. 8 is a schematic view for explaining the state in which an exhaust of the powder feed sliding valve shown in Fig. 2 is sealed, Fig. 9 is a cross-sectional view for explaining an operational relationship of the powder feed sliding valve according to a second embodiment of the present invention shown, and Fig. 10 is a schematic view for explaining the state in which an exhaust of the powder feed sliding valve shown in Fig. 9 is sealed.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail by way of a preferred embodiment with reference to accompanying drawings, in which like reference numerals are used to identify the same or similar parts.

<First embodiment> Fig. 2 to Fig. 8 are drawings for explaining a powder feed sliding valve according to a first embodiment of the present invention.

First, as shown in Fig. 2 and Fig. 3, the powder feed sliding valve according to the present invention includes a body 20 both sides and an upper portion of which are open. A guide home 2 I is formed in the lower middle of

the body 20. Also, inlet holes 22 connected to an inlet flange 31 for functioning as an inlet are formed at one side of the body 20. At this time, the inlet holes 22 are formed, in the body 20, to have a straight-line cylindrical line feed line and the inlet flange 31 connected to the inlet hole 22 is also formed to have has a straight-line cylindrical line feed line. In other words, as shown in Fig. 7, a cross-sectional of the inlet hole 22 is formed in a circular shape.

Also, as shown in Fig. 7, around the inlet hole 22 is machined so that a circular gasket 32 for functioning to seal can be inserted. Then, insertion hole (not shown) into which a rectangular gasket 33 for functioning to seal can be inserted are formed on both sides of the inlet hole 22.

Then, as shown in Fig. 2, first and second exhaust holes 23 and 24, to which first and second exit flanges 34 and 35 functioning as an exhaust are connected respectively, are formed at another side of the body 20. At this time, the first and second exhaust holes 23 and 24 are separated by a given distance and are respectively formed in the body 20 so that they can have a circular feed line having a given curvature. Also, the first and second exit flanges 34 and 35 connected to the first and second exhaust holes 23 and 24 are formed to have a circular feed line having a given curvature. That is, as shown Fig. 8, the cross-sectional view of the first and second exhaust holes 23 and 24 is formed in an elliptical shape.

Also, around the first and second exhaust holes 23 and 24 are machined so that the first and second elliptical gaskets 36 and 37 for functioning to seal can be inserted respectively. Then, inserting homes 39, into which the rectangu) ar gasket 38 for functioning to seal can be inserted.

are receptively formed in outer sides of the first and second exhaust holes 23 and 24.

Meanwhile, as shown in Fig. 5 and Fig. 6, a portion T slanted from the inside to the outside at a given angle of inclination is formed around an internal lower portion of the gasket 32 and the first and second elliptical gaskets 36and 37 and a plurality of air exhaust slots S are formed along the length direction in its internal portion. The reason the slant portion T and the air exhaust slot S are formed in the inside of the gaskets 32,36 and 37 is that air remained within the gaskets are exhausted toward the outside when the gaskets 32,36 and 37 are mounted, so that the gaskets 32, 36 and 37 can be smoothly inserted.

Then, depressions and prominences having a given depth are formed on the circular gasket 32 and the first and second elliptical gaskets 36 and 37 in order to improve sealing up. Also, depressions and prominences having a given depth are formed in front of the rectangular gaskets 33 and 38 in order to improve sealing up.

Also, as shown in Fig. 2, a sliding block 40 is formed within the body 20 coupled mentioned above. The sliding block 40 is formed by combining rectangular pins, within which a first pipe 41 and a second pipe 42 having a given curvature are coupled so that they can pass through the outside.

At this time, the first and second pipes 41 and 42 have a curvature for allowing power supplied through the inlet flange 31 can be smoothly supplied to the first and second outlet flanges 34 and 35.

As shown in Fig. 4, one side of the first and second pipes 41 and 42, that is, a portion c ! ose ! y adhered to die iniet hole 22 is coupled to the

sliding block 40 so that the one side can be completely matched to the circular inlet hole 22 to thus form a circular cross-section. On the other hand. the other side of the first and second pipes 41 and 42, that is, a portion closely adhered to the first and second exhaust holes 23 and 24 is coupled to the sliding block 40 so that the other side be completely matched to the first and second exhaust holes 23 and 24 to thus form an elliptical cross-section.

Then, a guide projection (not shown) that slides along the guide home 21 of the body 20 is formed at the bottom of the sliding block 40. Also, a fastener 44 tightened with a cylinder 55 is formed on the sliding block 40.

Meanwhile, closers 51 and 52 are coupled at both sides of the body 20 by means of bolts, etc and a cover 53 is coupled on the body 20 by means of bolts, etc. At this time, the cover 53 has a hole 54 for allowing the fastener 44 of the sliding block 40 to protrude toward outside.

Also, the cover 53 is coupled to a cylinder 55 coupled to the fastener 4 of the sliding block 40, for sliding the sliding block 40.

An operating relationship of the power feed sliding valve constructed above will be below explained in detail.

As can be seen from Fig. 2 to Fig. 4, the powder is feed to the second exit flange 35 via the inlet flange 31 and the second pipe 42. At this time, the power is completely sealed by means of the circular gasket 32. the rectangular gaskets 33 and 38, and the second elliptical gasket 37. If it is desired to change the direction of the power being feed, the cylinder 55 is driven to slide the sliding block 40. Thus, the second pipe 42 to connect the inlet flange 31 and the second exit flange 35 no longer forms a penetration line. Instead, the first pipe 41 connects the inlet flange 3) and the first exit

flange 34. As a result, the power is completely sealed by means of the circular gasket 32, the rectangular gaskets 33 and 38, and the first elliptical gasket 36.

By repeatedly performing the above procedures, the direction of the powder is selected to determine the feed direction of the power.

<Second embodiment> The powder feed sliding valve according to a second embodiment of the present invention is same to that of the first embodiment except for the shape of the pipe positioned within the sliding block and the shape of the exit flange connected to the pipe are different. Therefore, for simplicity, a explanation for similar or same numeral will be omitted.

Figs. 9 and 10 are drawings for explaining a powder feed sliding valve according to a second embodiment of the present invention shown.

First, as can be seen from Fig. 9, first and second exhaust holes 23a and 24a to which first and second exit flanges 34a and 35a selving as an exhaust are respectively connected are formed at one side of the body 20a.

At this time, the first and second exhaust holes 23a and 24a are separated by a given distance. The second exhaust hole 24a is formed in the body 20a so that it can have a straight-line cylindrical feed line. Also, the second exit flange 35a connected to the second exhaust hole 24a is formed to have a straight-line cylindrical feed line. That is, the cross-section of the second exhaust hole 24a is formed in a circular shape. The first exhaust hole 23a is formed in the body 20a so that it can have a cylindrical feed line having a curvature. Also. the first exit flange 34a connected to the first exhaust hole

23a is formed to have a cylindrical feed line having a curvature. That is, the cross-section of the first exhaust hole 23a is formed in an elliptical shape.

Then, around the first and second exhaust holes 23a and 24a is machined so that each of the elliptical gasket 36a and the circular gasket 37a for functioning to seal up can be inserted.

Also, as shown in Fig. 9. a straight-line second pipe 42a and a first pile 4 la both of which have a given curvature are coupled to the outside within the sliding block 40a. At this time, the first pipe 41 a has a curvature through which the power supplied via the inlet flange 31 can be smoothly supplied to the exit flange 34a.

Then, as shown in Figs. 9 and 10, one side of the first and second pipes 41 a and 42a, that is, a side closely adhered to the second exhaust hole 24a is coupled to the sliding block 40a to have a circular cross-section through which the circular first exhaust hole 24a can be completely matched. On the other hand, a portion closely adhered to the first exhaust hole 23a is coupled to the sliding block 40a to have a elliptical cross-section through which the circular first exhaust hole 24a can be completely matched.

As mentioned above, according to the present invention, the feed direction of power supplied from an inlet is selected by means of two sliding pipes formed in the same feed direction. Therefore, the present invention facilitates feed of the power.

Also, according to the present invention. an internal sealing up is good by means of a gasket having different shapes at respective positions.

Therefore, the present invention can exhaust an exact amount of power throughan exhaust.

The present invention has been described with reference to a particular embodiment in connection with a particular application. Those having ordinary skill in the art and access to the teachings of the present invention will recognize additional modifications and applications within the scope thereof.

It is therefore intended by the appended claims to cover any and all such applications, modifications, and embodiments within the scope of the present invention.