Patent Publication Number: US-4929346-A

Title: Vibratory separtor screen assembly

Description:
BACKGROUND OF THE INVENTION 
     There are many types vibro separators from single-stage onedirection vibrating type to multi-stage 3-dimensional vibrating type. 
     However, according to the information available, the inventor has found that all the current vibro separators have the following deficiencies in common: 
     1. Easily to deform with depression at the center part of the screen. 
     2. Ball-tapping separators are even fast-damaging. 
     3. Difficult for screen replacement. For example, the Japanese-made separators use quite a number of bolts and nuts to fasten the screen edge with a tension ring to an internal flange in the spacing frame. You have to disassemble and reassemble all the bolts and nuts during replacing which takes extra labor and time. As for the American-made separators, they fasten the screen to the screen frame by spot welding with a tension ring. Whenever you want to replace, you must change the screen and the frame together, resulting in additional cost. 
     4. Poor tapping efficiency. The tapping balls are always moved to concentrate on the outside surrounding area by the centrifugal force due to vibrating. 
     5. Difficult for ball &amp;ray assembling and disassembling. There are a number of long bolts to be used to fasten the ball tray edge through the screen frame and lower spacing frame. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is the schematic drawings of embodiment for a multi-stage 3-dimensional vibro separator used for this invention. 
     FIG. 2 is to show the method of fastening the coarse screen to the screen frame. 
     FIG. 3 is the structure drawing to show the final assembly of the major parts used for this invention. 
     FIGS. 4 and 5 are showing the screen fasten structures of conventional Japanese-made and U.S.-made separator respectively for reference. 
     FIG. 6 is the schematic drawing of the new designed ball tray assembly. 
    
    
     SPECIFIC DESCRIPTION OF THE DRAWINGS 
     As shown in FIG. 1, The major parts of this invention and the parts related to fasten the major parts are as follows: 
     (1) Screen frame. 
     (2) Coarse screen (2-16 mesh). 
     (3) Round bar tension ring. 
     (4) Holes. 
     (5) Studs. 
     (6) Main screen (fine mesh). 
     (7) Ball tray. 
     (8) Tapping balls. 
     (9) Spacing frame. 
     (10)&#34;V&#34; clamp ring. 
     (11)&#34;V&#34; clamp ring fastening bolts. 
     As shown in FIG. 2 is as follows: 
     (1) Screen frame, &#34;L&#34; cross section; 
     (1-1) The wall (Vertical part) of the screen frame; 
     (1-2) The flange (Horizontal part) of the screen frame; 
     (1-3) The half-rounded groove on the flange near by the wall of the frame; 
     (1-4) The thread holes in the groove (1-3) for studs (5); 
     (1-5) The inner shoulder cutting space at the bottom of the screen frame; 
     (2) Coarse screen; 
     (3) Rounded-bar tension ring; 
     (4) Holes in the ring; 
     (5) Studs; 
     In this figure, we can see that the outside surrounding part of the coarse screen (2) will be pressed down around the outside edge of the wall (1-1) into the groove (1-3) by the rounded bar tension ring and be fastened by the studs (5) through the hole (4) into the thread holes (1-4). Then the whole coarse screen and frame assembly has being completed. 
     With this designation, the top surface of the coarse screen is kept in a flat manner (the tension ring is not on the top of the frame). So that the main screen can be directly laid on the coarse screen and can be fully supported by it. 
     As shown in FIG. 3, the main screen (6) will be directly laid on the top surface of the coarse screen (2) with the outside edge pressed and folded downward by the flange of upper spacing frame (9) and secured between a rubber cushion ring (12) and the flange of the screen frame (1-2) which will be combined together with the flange of lower spacing frame by the &#34;V&#34; clamp ring (10) and tighten up with two fastening bolts (11). 
     When the main screen (6) is to be replaced, just loosen the &#34;V&#34; clamp ring (10) and remove the upper spacing frame (9) and the rubber cushion ring (112). The replacement work can be easily completed within a few minute. 
     FIG. 4 is to show the screen fasten structure of a Japanese-made separator for reference which uses many bolts and nuts to secure the screen resulting in much more labor and time for replacement. 
     FIG. 5 is the conventional US.-made separator which uses spot welding to secure the screen resulting in additional cost for replacement. 
     Judging from the shortcomings of the Japanese-made and U.S.-made separators, the advantages of the present invention should be apparently recognized. 
     As shown in FIG. 6, is as follows: 
     (1) Screen frame 
     (1-5) The inner shoulder cutting space at the bottom of the screen frame. 
     (7) Ball tray 
     (8) Tapping balls 
     (8-1) Plastic barrier rings 
     (9) Lower spacing frame. 
     In this FIG. 6. We can see the new designed plastic barrier rings (8-1) are employed for the purpose to confine the tapping balls (8) into groups. The height of the ring wall is designed to limit the balls (8) just can not jumping out from the ring (8-1). And the rings (8-1) can move freely on the ball tray (17) with the balls (8) enclosed. The number of rings (8-1) to be used is decided so as almost to full fill the whole area of ball tray (7) but not cloged their moving. The tapping operation will be even distributed all around the under surface of coarse screen (2). The outside edge of ball tray (7) is to be put on the flange of lower spacing frame and to be held in position by the inner shoulder cutting space at the bottom of screen frame. There are no bolts needed.