Powder material supply device

Abstract

The present invention provides a powder material supply device, wherein a powder and/or granular material supplied to an inner cylinder 4 is pushed outward through a gap G by rotation of a rotary blade 8 and discharged from an outlet 18 , the outlet 18 being arranged to satisfy the relation of L 1 ≧G×(1/tan X°) (wherein X° is an angle of response of the powder and/or granular material), with the shortest distance from the outer end of outlet 18 to a point directly below the inner circumference of the inner cylinder 4 on the bottom plate 2 a being L 1 (mm), and the dimension of the gap being G (mm). With such a powder material supply device, a fixed amount of powder and/or granular material mixing two or more kinds of powder and/or granular material can be supplied while suppressing a fluctuation in the content ratio.

1 . A powder material supply device comprising: 
 an external cylinder having a lower end covered with a bottom plate;    a rotary blade rotatably provided along the upper surface of the bottom plate; and    an inner cylinder having a cylindrical shape supported in the external cylinder in such a manner that the axis thereof is substantially consistent with the rotation center of the rotary blade and a gap is formed from the bottom plate;    an outlet being formed in the bottom plate between the external cylinder and the inner cylinder;    the powder material supply device being structured so that a powder and/or granular material supplied to the inner cylinder is pushed outside through the gap by rotation of the rotary blade and then discharged from the outlet;    the outlet being arranged so as to meet the formula below when the shortest distance from the outer end of the outlet to a point directly below the inner circumference of the inner cylinder on the bottom plate is defined as L 1  (mm), and the dimension of the gap is defined as G (mm);    the powder material supply device further comprising a conical guiding part disposed in the center of the inner cylinder on the bottom plate;    the ratio of the diameter of the bottom surface of the guiding part to the inside diameter of the inner cylinder being 0.18 to 0.45; and    a periphery portion of the guiding part extending outwardly so that the powder and/or granular material can be placed between the bottom surface of the guiding part and the bottom plate of the external cylinder;        L 1≧ G ×(1/tan  X °) 
   wherein X° is an angle of repose of the powder and/or granular material.    
     
     
         2 . A powder material supply device comprising: 
 an external cylinder having a lower end covered with a bottom plate;    a rotary blade rotatably provided along the upper surface of the bottom plate; and    an inner cylinder having a cylindrical shape supported in the external cylinder in such a manner that the axis thereof is substantially consistent with the rotation center of the rotary blade and a gap is formed from the bottom plate;    an outlet being formed in the bottom plate between the external cylinder and the inner cylinder;    the powder material supply device being structured so that a powder and/or granular material supplied to the inner cylinder is pushed outside through the gap by rotation of the rotary blade and then discharged from the outlet;    the outlet being arranged so that the shortest distance from the outer end of the outlet to a point directly below the inner circumference of the inner cylinder on the bottom plate is greater than the gap;    the powder material supply device further comprising a conical guiding part disposed in the center of the inner cylinder on the bottom plate;    the ratio of the diameter of the bottom surface of the guiding part to the inside diameter of the inner cylinder being 0.18 to 0.45; and    a periphery portion of the guiding part extending outwardly in such a manner that the powder and/or granular material lies between the bottom surface of the guiding part and the bottom plate of the external cylinder.    
     
     
         3 . The powder material supply device according to  claim 1  or  2 , wherein the gap is formed substantially uniformly along the entire circumference of the inner cylinder.  
     
     
         4 . The powder material supply device according to  claim 1  or  2 , which further comprises a cylindrical feeding can with a bottom that holds the powder and/or granular material, and that is invertedly and removably attached to the top end of the inner cylinder, wherein the feeding can has an inside diameter substantially the same as the inside diameter of the inner cylinder.  
     
     
         5 . The powder material supply device according to  claim 1  or  2 , wherein the gradient angle of the conic surface of the guiding part relative to the bottom plate is 20 to 80°.  
     
     
         6 . The powder material supply device according to  claim 1  or  2 , wherein the gap is 5 to 100 mm.  
     
     
         7 . The powder material supply device according to  claim 1  or  2 , wherein the inner cylinder has a reduced diameter in the outlet side of the lower end portion.  
     
     
         8 . A powder material supply device comprising: 
 an external cylinder having a lower end covered with a bottom plate;    a rotary blade rotatably provided along the upper surface of the bottom plate; and    an inner cylinder having a cylindrical shape supported in the external cylinder in such a manner that the axis thereof is substantially consistent with the rotation center of the rotary blade and a gap is formed from the bottom plate;    an outlet being formed in the bottom plate between the external cylinder and the inner cylinder;    the powder material supply device being structured so that the powder and granular material supplied to the inner cylinder is pushed outside through the gap by rotation of the rotary blade and then discharged from the outlet; and    the outlet being arranged so as to meet the formula below when the shortest distance from the outer end of the outlet to a point directly below the inner circumference of the inner cylinder on the bottom plate is defined as L 1  (mm), and the dimension of the gap is defined as G (mm);    the powder material supply device further comprising a cylindrical feeding can with a bottom that holds a powder and/or granular material, and that is invertedly and removably attached to the top end of the inner cylinder; and    the feeding can having an inside diameter substantially the same as the inside diameter of the inner cylinder;        L 1≧ G ×(1/tan  X °) 
   wherein X° is the angle of repose of the powder and/or granular material.    
     
     
         9 . A powder material supply device comprising: 
 an external cylinder having a lower end covered with a bottom plate;    a rotary blade rotatably provided along the upper surface of the bottom plate; and    an inner cylinder having a cylindrical shape supported in the external cylinder in such a manner that the axis thereof is substantially consistent with the rotation center of the rotary blade and a gap is formed from the bottom plate;    an outlet being formed in the bottom plate between the external cylinder and the inner cylinder;    the powder material supply device being structured so that a powder and/or granular material supplied to the inner cylinder is pushed outside through the gap by rotation of the rotary blade and then discharged from the outlet;    the outlet being arranged so that the shortest distance from the outer end of the outlet to a point directly below the inner circumference of the inner cylinder on the bottom plate is greater than the gap;    the powder material supply device further comprising a cylindrical feeding can with a bottom that holds the powder and/or granular material, and that is invertedly and removably attached to the top end of the inner cylinder; and    the feeding can having an inside diameter substantially the same as the inside diameter of the inner cylinder.    
     
     
         10 . The powder material supply device according to  claim 8  or  9 , wherein the feeding can is connected to the inner cylinder  4  via a slide damper, and the slide damper comprising a casing having an opening portion that slidably holds a partition plate.