Abstract:
Disclosed are a projector comprising an impeller rotated at high speed by a high-speed rotation driving device and a cover for covering the outer peripheral part of the impeller and having a projection material suction port and a projection material discharge port; and a blasting machine. In the projector, the entire of the impeller or the portion of the impeller with which the projection material is collided is formed of a high wear resistant rubber. It is possible to prevent the impeller and the projection material from damage, and to improve the durability of the projector. Furthermore, projection materials having high grinding property or those having fine particles and low specific gravity may also be used for the projector. Since the weight of the projector is light, it can be rotated directly by a motor at high speed and can be used under such conditions as ultra low temperature, ordinary temperature, high moisture, etc.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    The present invention relates to a projector to be used for a shot blast machine, and a shot blast machine which deburrs and treats surface of molded goods and removes crud attached to surface of workpieces. 
         [0002]    The conventional shot blast machine uses the projector with the impeller which is made of metal material. This brings a drawback that the projectile damages itself when it strikes the impeller. Another drawback is that projectile with high grindability cannot be used, since it damages the impeller. A still further drawback is that the impeller being used is made of metal material and heavy, requiring a large motor to drive it, high cost and the impeller being hard to rotate at high speed. 
         [0003]    Patent Document 1: Japanese published unexamined application H3-234470 
       SUMMARY OF THE INVENTION 
       [0004]    In view of the conventional drawbacks as described above, it is an object of the present invention to provide a projector and a shot blast machine which do not cause any damage to and can increase the durability of the impeller and the projectile. 
         [0005]    It is another object of the present invention to provide a projector and a shot blast machine which can use the projectile with high grindability or of small particle size or low specific gravity. 
         [0006]    It is still another object of the present invention to provide a projector and a shot blast machine which can be used at any condition including extreme cold, normal temperature, wet condition and the like. 
         [0007]    The above and further objects and novel features of the present invention will more fully appear from the following detailed description when the same is read in connection with the accompanying drawings. 
         [0008]    It is to be understood that these are for purpose of illustration only and are not intended to be a definition of the limits of the invention. 
         [0009]    In order to achieve the above mentioned purpose, in the present invention, the projector is comprised of an impeller which is high-speed rotated by a high-speed rotating driving device and a cover which covers a periphery of the impeller, wherein the cover has a projectile suction port and a projectile exhaust port therein, and further wherein an entire impeller or a portion of the impeller where projectile strikes is formed of high abrasion-resistant rubber. 
         [0010]    According to another aspect of the invention, a shot blast machine which is equipped with the projector is comprised of an impeller which is high-speed rotated by the high-speed rotating driving device and the cover which covers the periphery of the impeller and has the projectile suction port and the projectile exhaust port therein, wherein the entire impeller or a portion of the impeller where the projectile strikes is formed of high abrasion-resistant rubber. 
         [0011]    As is clear from the above-mentioned explanations, the present invention as hereinabove defined provides the effects enumerated below. 
         [0012]    For the shot blast machine with the impeller, since the shot blast machine uses the impeller which is formed of the high abrasion-resistant rubber, it can prevent the damage of the projectile when it is blasted and strikes the impeller. Therefore, it can improve the durability of the projectile, and it is possible to manufacture it at a relatively low cost. 
         [0013]    (2) As described in above (1), it can reduce the noise which is produced when the projectile strikes the impeller. 
         [0014]    (3) As described in above (1), when the projectile with high grindability is used, it can be used without the damage of the impeller. 
         [0015]    Therefore, widely different kinds of the projectile are used and for widely different kinds of workpiece. 
         [0016]    (4) As described in above (1), since the weight of the impeller can be reduced, it is possible to rotate the impeller at high speed. Therefore, the projectile can be blasted out efficiently, and the projectile of small size and high specific gravity can be used. 
         [0017]    (5) According to another aspect of the invention having the same effect as the above (1) to (4), the impeller can be directly rotation-driven by a small high speed motor. Thus, size reduction and low cost manufacturing can be achieved. 
         [0018]    (6) According to another aspect of the invention having the same effect as the above (1) to (5), durability of the projectile can be further improved and the projector can be further noise-reduced. 
         [0019]    (7) According to yet another aspect of the invention having the same effect as the above (1) to (5), deformation of the impeller body under temperature change can be suppressed by the supporting plate, the disc flange, and the plurality of spacing members. 
         [0020]    (8) According to yet another aspect of the invention having the same effect as the above (1) to (4), the projector with the impeller blasts out the liquid with the projectile widely, and it deburrs molded goods, treats the surface of molded goods and removes crud attached to the surface of workpieces. 
         [0021]    (9) As described in above (8), since the projectile-mixed liquid can be supplied into the projector with the impeller by the pump, the structure is simple, and transporting of the projectile-mixed liquid is smooth. 
         [0022]    (10) As described in above (8), since the projectile-mixed liquid can be supplied into the projector with the impeller by the pump and can be blasted out to the workpiece by the projector so as to remove flash from the molded goods (workpiece), it is not necessary to accelerate the speed and increase pressure for the carrying of the projectile-mixed liquid to the projector, the structure is simple and the projectile-mixed liquid is transported reliably. 
         [0023]    (11) According to another aspect of the invention having the same effect as the above (1) to (5), the projector has a simple structure and is easy to manufacture. In addition, since the slurry pump is used, it can supply the liquid with the durable projectile in efficiency. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]      FIG. 1  is a front view showing a first embodiment of the present invention; 
           [0025]      FIG. 2  is a side view showing the first embodiment of the present invention; 
           [0026]      FIG. 3  is a cross-sectional view taken along a line of  3 - 3  in  FIG. 1 ; 
           [0027]      FIG. 4   FIG. 4  is a vertical cross-sectional view of a projector showing the first embodiment of the present invention; 
           [0028]      FIG. 5  is a cross-sectional view taken along a line of  5 - 5  in  FIG. 4 ; 
           [0029]      FIG. 6  is an explanation view of a nozzle showing the first embodiment of the present invention; 
           [0030]      FIG. 7  an explanation view of an operation showing the first embodiment of the present invention; 
           [0031]      FIG. 8  is a schematic view showing a second embodiment of the present invention; 
           [0032]      FIG. 9  is an explanation view of an operation showing the second embodiment of the present invention; 
           [0033]      FIG. 10  is front view showing a third embodiment of the present invention; 
           [0034]      FIG. 11  is a cross-sectional view taken along a line of  11 - 11  in  FIG. 11 ; 
           [0035]      FIG. 12  is an explanation view of an operation showing the third embodiment of the present invention; 
           [0036]      FIG. 13  is a schematic explanation view showing a fourth embodiment of the present invention; 
           [0037]      FIG. 14  is an explanation view of an operation showing the fourth embodiment of the present invention; 
           [0038]      FIG. 15  is a front view showing a fifth embodiment of the present invention; 
           [0039]      FIG. 16  is a cross-sectional view taken along a line of  16 - 16  in  FIG. 15 ; 
           [0040]      FIG. 17  is a cross-sectional view showing a sixth embodiment of the present invention; 
           [0041]      FIG. 18  is a partial fracture cross-sectional view showing a projector; 
           [0042]      FIG. 19  is a cross-sectional view taken along a line of  19 - 19  in  FIG. 18 ; 
           [0043]      FIG. 20  is a plan view showing a projector of the sixth embodiment of the present invention; 
           [0044]      FIG. 21  is a front view showing an impeller of the sixth embodiment of the present invention; 
           [0045]      FIG. 22  is a side view showing an impeller of the sixth embodiment of the present invention; 
           [0046]      FIG. 23  is a cross-sectional view taken along a line of  23 - 23  in  FIG. 22 ; 
           [0047]      FIG. 24  is a front view showing a seventh embodiment of the present invention; 
           [0048]      FIG. 25  is cross-sectional view taken along a line of  25 - 25  in  FIG. 24 ; and 
           [0049]      FIG. 26  a plan view showing the seventh embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0050]    Preferred embodiments of the present invention will now be described in detail below referring to the accompanying drawings. 
         [0051]      FIGS. 1 to 7  illustrate a first embodiment of the present invention wherein reference numeral  1  is a shot blast machine which deburrs molded goods, treats the surface of molded goods and removes crud attached to the surface of the workpieces. The shot blast machine  1  is comprised of a housing  2 ; a table  4  in the form of a perforated plate or a mesh, as a support for a workpiece  3 , installed into an upper portion of the housing  2 ; an openable door  5  attached to the housing  2  enabling placing the workpiece  3  onto and removing the workpiece  3  from the table  4 ; a separator  7  with a vibrating screen below the table  4  in the housing  2  and communicating with the table  4  through the hopper  6 ; a liquid tank  8  provided with liquid such as water, cleaning liquid or the like separated out by the separator  7  therein, a projectile tank  9  provided the projectile therein, a small particle tank  10  having small particles therein, and a large particle tank  11  provided large particles therein; a mixing tank  13  having a mixer  12  which mixes the liquid from the liquid tank  8  and projectile from the projectile tank  9 ; a projector  15  having an impeller  14  made of a high abrasion-resistant rubber, installing in the upper portion of the housing  2  capable of blasting out the projectile-mixed liquid to the table  4 ; a supplying channel  18  interposed a slurry pump  17  therebetween, the pump  17  sucks the projectile-mixed liquid in the mixing tank  13  and introduces in a nozzle  16  positioned into the projector  15 , a pump  19  which showers the liquid of the liquid tank  8  to the workpiece  3  supported by the table  4 ; and a shower device  21  having a shower nozzle  20 . 
         [0052]    The projector  15  further includes a wheel cover  23  having an opening  22  provided at the lower portion thereof and forming a nozzle-insertion hole  24  at a wall surface  23   a  of a side of suction and inserting fixedly the nozzle  16 ; the impeller  14  attached into the wheel cover  23  rotatably, being made of high abrasion-resistant rubber; and a high-speed motor  25  attached to the wheel cover  23 , capable of making the impeller  14  to drive at a high speed. 
         [0053]    In addition, the impeller  14  further includes one side plate  27  attached to a drive shaft  26  of the high-speed motor  25 , forming in the shape of a disc; a plurality of blades  28  fixed to a part except for a center portion of the side plate  27  in a radial pattern; and other side plate  30  fixed so as to cover the blades  28 , having a nozzle-insertion hole  29  formed at a part corresponding to the nozzle-insertion hole  24  of the wheel cover  23 . 
         [0054]    The above-constructed shot blast machine  1  uses water as a liquid when it removes the weld flashes of the molded goods. In addition, it uses washing water when it removes the cruds attached at the surface of the workpiece. 
         [0055]    When it is performed to blast, the projector  15 , pump  19 , slurry pump  17  and separator  7  are driven after the workpiece  3  is put on the table  4 . Thereby the projectile-mixed liquid of the mixing tank  13  is blasted from the nozzle  16  after it passes through the supplying channel  18  by the slurry pump  17 . The blasted liquid including the projectile is blasted to the workpiece  3  on the table  4  by the impeller  14 , which rotates at a high speed, of the projector  15 . 
         [0056]    In this way, since the projectile of the blasted liquid strikes the rotating impeller  14  with the high abrasion-resistant rubber, it can prevent the damage which would occur in the case of the conventional metallic impeller, and the blasting from the impeller  14  can be carried out as in the case of the conventional metallic impeller. 
         [0057]    The projectile-mixed liquid blasted out by the projector  15  is supplied to the separator  7  with the removed objects from the workpiece through the hopper  6 , and is sorted out as the large particle, projectile, small particle and liquid, and are introduced into the large particle tank  11 , projectile tank  9 , small particle tank  10  and liquid tank  8  respectively. The liquid supplied into the liquid tank  8  is supplied into the shower nozzle  20  by the mixing tank  13  and pump  19  of the shower device  21 , and it is showered to the workpiece  3  on the table  4 . 
         [0058]    In this way, the projectile-mixed liquid and liquid which is showered are circulated and used for blasting. 
         [0059]    Explained next are other embodiments of the present invention as illustrated in  FIGS. 8 to 28 . In explaining these other embodiments of the present invention, the same component parts as those in the first preferred embodiment of the present invention are given the same numerals in order to avoid overlapping explanations. 
         [0060]    A second embodiment of the present invention is shown in  FIGS. 8 and 9  and is distinguished from the first embodiment by the fact that a high abrasion-resistant rubber sheet  39  is fixed to an inner wall surface of the wheel cover  23  by adhering, coating and the like in order to blast the projectile-mixed liquid to the workpiece  3  on the table from the side and upper portion of the housing  2 ; and the projector  15  is replaced from two projectors  15 A,  15 A which adhered or coated a high abrasion-resistant rubber  41  on a surface of an impeller body  40  made of metal. 
         [0061]    A shot blast machine  1 A in this way according to the third embodiment has similar advantages to that according to the first embodiment. 
         [0062]    A third embodiment of the present invention is shown in  FIGS. 10 to 12  and is distinguished from the first embodiment by the fact that a belt conveyor  31  as a supporting device is used, forming in the shape of a L-letter, capable of holding the workpiece  3  and agitating it. A shot blast machine  1 B with the belt conveyor  31  according to the third embodiment has similar advantages to that according to the first embodiment. 
         [0063]    In addition, reference numerals  32 ,  33 ,  34  are revolving shafts which are arranged at the housing  2  so as to form in the shape of a L-letter, reference numeral  35  is belt which is laid on the revolving shaft  32 ,  33  and  34  so as to be formed in the shape of L-letter, having a plurality of through holes  36 ; reference numerals  37 ,  37  are guide rollers which are attached to the housing  2 , pressing the both edges of the belt  35  positioned between the revolving shafts  32  and  34 ; and reference numerals  38  is a reversible motor attached to the housing  2 , making the revolving shaft  33  to rotate in the forward and backward directions. 
         [0064]    A fourth embodiment of the present invention is shown in  FIGS. 13 and 14  and is distinguished from the first embodiment by the fact that the liquid and projectile which are selected by the separator  7  are stored automatically by own weight into the mixing tank  13  with the mixer  12 , and the liquid which overflows from the mixing tank  13  is supplied into the shower device  21 . 
         [0065]    A shot blast machine  1 C in this way according to the fourth embodiment has similar advantages to that according to the first embodiment. 
         [0066]    A fifth embodiment of the present invention is shown in  FIGS. 15 and 16  and is distinguished from the first embodiment by the fact that the projectile which are selected by the separator  7  is stored into a projectile tank  42 , and the projectile is sucked from the projectile tank  42  by a suction hose  43  and is supplied into the projector  15 . 
         [0067]    A shot blast machine  1 D in this way according to the fifth embodiment may be composed. 
         [0068]    A sixth embodiment of the present invention is shown in  FIGS. 17 to 23  and is distinguished from the first preferred embodiment of the present invention by the fact that the impeller  14 A is comprised of: an impeller body  40  comprising a discoid side panel  27  of which central portion a projectile suction port  44  is formed, a plurality of blades  28  which are and integrally formed in a radial pattern between the projectile suction port  44  on inner surface and the periphery of the side plate  27 , and other side plate  30  integrally formed with the plurality of blades  28 , a disk flange fitting hole  45  being formed in central portion thereof; a metallic supporting plate  46  attached in such manner that it contacts with lateral surface of the one side plate  27  of the impeller body  40 ; a disc flange  47  which is attached to the drive shaft  26  of the high-speed motor  25  in such manner that it contacts with lateral surface of the other side plate  30  of the impeller body  40 ; and a plurality of metallic spacing members  49  which are attached at predetermined distance through a plurality of shaft holes  48 ,  48  formed in the one side plate  27  and the other side plate  30  in such manner that distance between the periphery of the disc flange  47  and the supporting plate  46  is kept constant. 
         [0069]    A shot blast machine  1 E constructed by using a projector  15 B and a wheel cover  23 A in this way according to the sixth embodiment has similar advantages to that according to the first preferred embodiment of the present invention. In embodiments of the present invention, high abrasion-resistant rubber  51 ,  51 ,  52  are disposed on inner wall surfaces, which are also outer periphery of the both sides of a cover body  50 , the high abrasion-resistant rubber  51 ,  51  are fixed to the cover body  50  by a plurality of countersunk screws  53  and nuts  54 . However, the present invention is not limited to this application. It may also be applicable to use a high abrasion-resistant rubber which is integrally formed in such manner that it fits inside the inner wall surface of the cover body  50 . 
         [0070]    A seventh embodiment of the present invention is shown in  FIGS. 24 to 26  and is distinguished from the sixth embodiment of the present invention by the fact that it comprises: a hopper-shaped bulkhead  57  which divides the housing  2  in such manner that the upper portion serves as a blast-processing chamber  55  while the lower portion does as a projectile-processing chamber  56 ; a deburring parts holder  61  which is comprised of a motor  58  which is mounted on the housing  2  inside the blast-processing chamber  56  so as to allow the motor  58  to support and rotate the deburring parts, and a bucket  60  which is formed of a perforated plate having a plurality of through holes  59  being formed therein which allow the projectile to pass through them; a projectile container  62  which reserves the projectile being separated by the separator  7  in stalled in the projectile-processing chamber  56 ; a suction hose  63  installed in such manner that the projectile reserved in the projectile container  62  can be sucked to the impeller  14 A by high-speed rotation of the impeller  14 A in the projector  15 B; a refrigerant supplier  66  having a refrigerant pipe  65  which is equipped with a solenoid valve therein, the refrigerant supplier  66  supplies refrigerant such as liquefied inert gas including liquefied nitrogen and liquefied carbon dioxide to the blast-processing chamber  55 ; and 
         [0071]    an exhaust pipe  68  which is installed on top of the blast-processing chamber  55  and has a damper therein. 
         [0072]    A shot blast machine  1 F in this way according to the seventh embodiment has similar advantages to that according to the first preferred embodiment of the present invention. 
         [0073]    The present invention allows using projectiles other than those mentioned in the embodiments of the present invention for any type of shot blast machine as long as it blasts out such a projectile by an impeller. 
         [0074]    The present invention is applicable in the industry of manufacturing the shot blast machine.