JP2016098088A - Powder supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder supply device which achieves good quantitative capability of a powder supply amount, enables easy adjustment of the supply amount, is manufactured at low costs, and handles powders having a wide variety of physical properties.SOLUTION: A powder supply device 1 comprises: a hopper 2 having a powder inlet port 21 and a powder discharge port 22 oriented to the lower side; a cylindrical powder conduit 3 which is erected below the powder discharge port 22 so as to rotate in a circumferential direction and has an inner hole; an extrusion body 4 which is provided so as not to contact with a lower end part of the powder conduit 3; and a driving device which rotates the powder conduit 3. A center axis H of the inner hole of the powder conduit 3 is offset from a center axis C of the powder conduit 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an apparatus for continuously and quantitatively supplying powder, and more particularly to a powder supply apparatus that improves the quantitativeness of discharged powder.

  Today, in various industrial fields such as chemicals, chemicals, plastics, electronics, food, ceramics, machinery, and metals, powders are handled when commercializing or processing various raw materials. When handling such powders, it is necessary to supply a wide variety of powders depending on the purpose as the necessary equipment or equipment in the major production technology processes such as dispersion, quantitative supply, molding, and inter-process transport. An apparatus has been proposed and put into practical use. The powder supply device has good quantification of supply amount (quantitativeness), easy adjustment of supply amount (controllability), easy operation and maintenance (management and operability), and handling possible New powders are required to have a wide range of physical properties (general versatility), low production costs and low power consumption (economical).

  As shown in FIG. 4, the inventor previously described a hopper 101 that is fixed to a wall body 105 with a support rod and can introduce powder 103, and a lower end portion of the hopper 101. The conical body 102 mounted on the movable plate 104 in a non-contact state, and the rotational clamp that is fixed to the wall body 105 and is sandwiched from the thickness direction of the movable plate 104, and the movable plate 104 is movably supported in the horizontal direction. Body 106, powder outflow hole 107 provided in movable plate 104 in the outer peripheral area of cone 102, funnel-shaped powder outflow pipe 108 for guiding the powder flowing out from powder outflow hole 107 downward, and rotation A motor 109 capable of rotating the body 110a, rotating bodies 110a and 110b having rotating shafts provided at both ends of the movable plate 104, the rotating bodies 110a and 110b and the movable plate 104, respectively. Fixing shaft 111a for connecting, has developed a powder supplying device provided with 111b (see Patent Document 1).

  That is, in this powder supply apparatus, the movable plate 104 is connected to the motor 109 via the rotating bodies 110a and 110b, and is rotated by a parallel crank mechanism, whereby the center of the cone located at the outlet of the hopper 101 is obtained. The axis C ′ performs a revolving circular motion around the hopper center axis H ′, changes the gap between the surface of the cone 102 and the inner wall of the hopper 101, scrapes the powder 103 in the hopper 101, and passes through the powder outflow hole 107. A fixed amount of powder 103 was discharged and supplied to the powder outflow pipe 108.

  In the powder supply apparatus configured as described above, the powder 103 can be continuously and reliably discharged from the powder outflow pipe 108 while having a relatively simple structure.

Japanese Patent No. 4649246

However, the apparatus described in Patent Document 1 has the following problems.
(1) Since a parallel crank mechanism is constructed by assembling a large number of various machine parts, the circular motion of revolution is perfectly round due to the assembly error of various machine parts and the inevitably inherent clearance of machine parts. It was difficult to draw and there was an error in the motion accuracy of the cone. Accordingly, for example, powders that require high accuracy in the supply amount per unit time, such as pharmaceuticals and highly functional materials, have insufficient accuracy in quantitativeness.
(2) When adjusting the distance (eccentric distance) between the hopper center axis H ′ and the cone center axis C ′, not only the movable plate 104 is moved, but also the center axes of the fixed shaft 111a and the rotating body 110a. Adjustment of the axial distance and the axial distance between the fixed shaft 111b and the central axis of the rotating body 110b is also necessary, and the adjustment procedure is complicated. That is, it is complicated to adjust the gap according to the physical properties of the powder 103.
(3) Since the cone 102 rotates with the apex of the cone 102 inserted in the lower part of the hopper 101, the powder 103 receives a centrifugal force as the cone 102 rotates and presses against the lower inner wall of the hopper 101. As a result, the powder 103 adhered to the wall surface was bound, and an arching phenomenon occurred and the lower part of the hopper 101 was easily blocked. In particular, powder having a high binding force and moisture content and poor fluidity frequently causes arching 112 in the hopper 101. Therefore, the arching 112 is crushed with a stick or the like through a hand each time, or is collapsed by vibration. A vibration device was provided outside the hopper.

  The present invention has been made in view of the above-mentioned problems, and the quantitative amount of the powder supply amount is good, the adjustment of the supply amount is easy and can be manufactured at low cost, and the powder having a wide range of physical properties can be handled. An object of the present invention is to provide a powder supply device that can be used.

  For this reason, the powder supply apparatus of the present invention has a hopper having a powder inlet and a powder outlet directed downward, and is erected so as to be rotatable in the circumferential direction below the powder outlet and has an inner hole. A powder supply apparatus comprising: a cylindrical powder conduit; an extruded body provided in a non-contact state with respect to the lower end of the powder conduit; and a drive device for rotating the powder conduit. The first feature is that the central axis of the inner hole is eccentric with respect to the central axis of the powder conduit.

  The second feature is that the inner diameter of the powder conduit gradually increases in the downward direction, and the extruded body is composed of a flange portion and a conical portion protruding from the upper surface of the flange portion. The third feature is that a groove is formed on the outer periphery of the conical portion on the upper surface of the collar portion.

  Furthermore, a fourth feature is that the extruded body includes a moving mechanism that allows the extruded body to move horizontally and vertically with respect to the lower end of the powder conduit.

The present invention has the following excellent effects.
(1) By transmitting the rotational force of the driving device to the powder conduit with a structure having a small number of mechanical parts and rotating it, the powder conduit can perform a stable rotational motion. That is, since the powder conduit rotates with a certain amount of eccentricity with respect to the extruded body, the powder quantitative accuracy is improved (quantitative property). Also, it can be manufactured at low cost (management / operability, economy).
(2) Since the inner hole has a shape in which the diameter is gradually increased, the vertical component of the reaction force from the inner hole surface received by the powder can be directed downward to suppress the occurrence of arching.
(3) Since the groove is provided on the upper surface of the collar part, the powder can be stored in the upper surface of the collar part and the powder can be deposited in the powder conduit located above. (4) Since the extruded body can be moved in the horizontal and vertical directions, the gap between the extruded body and the powder conduit can be easily adjusted according to the physical properties of the powder and the supply amount (controllability, general-purpose sex).

It is a perspective view which shows the powder supply apparatus which concerns on this invention. It is a section perspective view showing the powder supply device concerning the present invention. It is a section perspective view showing a powder conduit and a cone concerning the present invention. It is a longitudinal cross-sectional view which shows a prior art.

  A main configuration of the powder supply apparatus 1 according to the present invention is illustrated in FIGS. 1 to 3. The powder supply apparatus 1 is erected with a hopper 2 having a powder input port 21 and a powder discharge port 22 directed downward, and is rotatably provided below the powder discharge port 22 in the circumferential direction. It has a cylindrical powder conduit 3, an extrudate 4 provided in a non-contact state at the lower end of the powder conduit 3, and a drive device that rotates the powder conduit 3. The drive device includes a drive motor 5 having a rotation shaft 51, a pulley 61 b disposed in the powder conduit 3, and a timing belt 62 stretched between the pulleys 61 a disposed on the rotation shaft 51. Yes.

  The hopper 2 is a cylindrical container having a diameter gradually reduced downward from its trunk, and has a powder inlet 21 at the upper part and a powder outlet 22 projecting downward at the lower part. The temporarily stored powder is discharged downward from the powder discharge port 22. The hopper 2 is charged with powders such as medicines and highly functional materials. The powder discharge port 22 is formed with a flange port, and a fixing tube 23 is connected to the flange port. The fixing tube 23 has a cylindrical shape, and flange ports of different sizes are formed at the inlet / outlet of the tube, and one flange port is connected to the powder discharge port 22 with a bolt or the like, and the other flange port is The hopper 2 is connected to a hopper fixing base 91 placed on the base 9 with bolts or the like, and plays a role of fixing the hopper 2 to the hopper fixing base 91.

  Note that the shape of the hopper 2 is not limited to a shape that is reduced in diameter downward from the body portion, such as a simple square shape or a simple cylindrical shape, and various shapes can be applied. Alternatively, the hopper 2 and the fixing tube 23 may be integrally formed. Furthermore, the shape of the powder inlet 21 may be, for example, a polygonal or circular inlet, and is not limited to the illustrated shape.

  As shown in FIG. 2, a powder conduit 3 is provided inside the fixing tube 23 (below the powder discharge port 22). As shown in FIG. 3, the powder conduit 3 is a cylindrical body, and has an inner hole 31 that gradually increases in diameter downward. The cross section (vertical cross section in the axial direction) of the inner hole 31 at the lower end of the powder conduit 3 is circular. Bearing parts 33a and 33b such as bearings are disposed on the upper and lower outer circumferences of the powder conduit 3, and are supported by the hopper fixing base 91 or the base 9 so as to be rotatable in the circumferential direction via the bearing parts 33a and 33b. Yes. A pulley 61 b is disposed on the middle periphery of the powder conduit 3. A timing belt 62 is stretched between the pulley 61b and the pulley 61a disposed on the rotation shaft 51 of the drive motor 5, and the rotational force of the drive motor 5 is transmitted to the powder conduit 3. It can rotate in the circumferential direction around the central axis C.

  As shown in FIG. 3, the extruded body 4 is formed by integrally forming a flange portion 41 and a conical portion 42 protruding to the upper surface of the flange portion 41. As shown in FIG. 2, the extruded body 4 is provided in a non-contact state immediately below the powder conduit 3, and is fixed to a movable plate 71 described later via an outer cylinder cover 73. The central axis of the conical portion 42 is arranged to be on the extension of the central axis C of the powder conduit 3. A concave strip 411 is formed on the outer periphery of the conical portion 42, and the collar portion 41 temporarily receives the powder flowing down from the powder conduit 3 and deposits the powder in the inner hole 31 of the powder conduit 3. By rotating the powder conduit 3, the powder accumulated at the tip of the conical portion 42 is pushed out while being pushed out and discharged to the powder receiving portion 74.

As shown in FIG. 3, the inner hole central axis H is provided at a position of a distance R with respect to the powder conduit central axis C. That is, since the powder conduit 3 rotates in the circumferential direction around the powder conduit central axis C, the inner hole central axis H is decentered by a distance R from the powder conduit central axis C, and around the powder conduit central axis C. A rotating motion will be performed. Since the central axis of the conical portion 42 is an extension of the powder conduit central axis C, the inner hole central axis H rotates with a distance R eccentric to the central axis of the conical portion 42. By this rotational movement, the gap between the inclined surface of the conical portion 42 and the inner peripheral edge 32 of the inner hole 31 on the extruded body 4 side changes. At the position (gap t) where the gap is minimized, the powder deposited on the powder conduit 3 is discharged to the powder receiving portion 74 so as to be pushed out.
Thus, the inner hole 31 of the powder conduit 3 always rotates with a constant eccentric distance R with respect to the conical portion 42. The position at which the distance between the inclined surface of the conical portion 42 and the circumferential edge 32 on the extruded portion 4 side of the inner hole 31 is kept moving as the circular hole 31 rotates, so that the powder is continuously and quantitatively measured. Supply is possible.

  The inner hole 31 of the powder conduit 3 is provided in a shape in which the diameter gradually increases in the powder falling direction (from the upper part to the lower part), and arching that occurs when the powder accumulates in the inner hole 31. It is possible to prevent the blocking phenomenon such as. Usually, in order to make the powder flow smooth, like the hopper 2, the inside has a shape gradually reduced in diameter from the upper part toward the lower part. However, when the inner hole 31 has a shape gradually reduced in diameter from the upper part toward the lower part, the centrifugal force acts on the powder deposited in the inner hole 31 by rotating the powder conduit 3 in the circumferential direction. The vertical component of the reaction force from the surface of the inner hole 31 acting on the powder is upward with respect to the centrifugal force of the powder, and arching is easily formed. Therefore, by gradually increasing the diameter of the inner hole 31, the vertical component of the reaction force from the surface of the inner hole 31 can be directed downward to suppress the occurrence of arching, and from the powder conduit 3. The powder discharging effect can be enhanced.

  As shown in FIG. 2, the moving mechanism 7 mainly includes a movable plate 71 and a plate operating unit 72. An opening 711 is formed in the movable plate 71, and an outer cylinder 73 is fixed to the upper surface of the periphery of the opening 711 with a bolt or the like, and the extruded body 4 is inserted into the outer cylinder 73 via a support piece 731. Is fixed. In addition, a funnel-shaped powder receiving portion 74 is fixed to the lower peripheral surface side of the opening 711, and the powder discharged by the extruded body 4 falls inside the powder receiving portion 74 and is discharged to the outside. . The movable plate 71 is provided at the lower part of the base 9 so as to be slidable in the illustrated XYZ axial directions (horizontal and vertical directions). The movable plate 71 is connected to the base 9 using a known mechanism such as a rack and pinion mechanism, a crank mechanism, or a feed screw mechanism, and can be slid in each axial direction by operating the plate operating unit 72. It is said that.

  Next, the operation of the powder supply apparatus 1 configured as described above will be described with reference to FIGS.

  First, powder is charged from the powder inlet 21. Then, the charged powder falls to the flange 41 of the extruded body 4. As shown by a two-dot chain line in FIG. 3, the dropped powder accumulates in a divergent shape from the inner peripheral edge 32, forms a substantially conical shape, and remains on the flange 41, and then the powder conduit 3 will be deposited.

  Here, the drive motor 5 is rotated, and the powder conduit 3 is caused to rotate around the central axis C. Then, the accumulated powder is broken down by the tip of the conical part 42 and falls to the collar part 41, and the amount of deposition changes. The increased amount of powder is pushed out from the collar 41 and falls from the collar 41. That is, the gap between the inclined surface of the conical portion 42 and the inner peripheral edge 32 of the inner hole 31 on the extruded body 4 side is reduced, so that the accumulated powder is pushed out by the tip of the conical portion 42 and pushed out. Then, it is discharged to the powder receiver 74. The discharged powder passes through the powder receiving portion 74, is discharged to the outside, and is supplied to the subsequent process.

  In addition, when the powder to be charged is changed to change the particle size or fluidity of the powder, or when it is necessary to change the supply amount to be supplied to the subsequent process, the movable plate 71 is slid to be extruded. The position of the body 4 can be accommodated by adjusting the separation distance with respect to the lower end of the powder conduit 3. Since the extrudate 4 is fixed to the movable plate 71 via the outer cylinder 73, the extrudate 4 slides by sliding the movable plate 71, and the inclined surface of the conical portion 42 of the extrudate 4 The gap between the inner hole 31 and the inner peripheral edge 32 on the extruded body 4 side is adjusted. Therefore, the minimum gap t can be adjusted in accordance with the physical properties of the powder and the supply amount, and the supply amount of the powder can be adjusted by changing the rotation speed of the powder conduit 3.

DESCRIPTION OF SYMBOLS 1 Powder supply apparatus 2 Hopper 21 Powder injection port 22 Powder discharge port 23 Fixing pipe | tube 3 Powder conduit | pipe 31 Inner hole 32 Inner peripheral edge 33 Bearing part 4 Extrusion body 41 ridge part 411 Concave part 42 Conical part 5 Drive motor 51 Rotating shaft 61 Pulley 62 Timing belt 7 Moving mechanism 71 Movable plate 711 Opening part 72 Plate operation part 73 Outer cylinder 731 Support piece 74 Powder receiving part 9 Base 91 Hopper fixing base 101 Hopper 102 Cone body 103 Powder 104 Movable plate DESCRIPTION OF SYMBOLS 105 Wall body 106 Rotation clamping body 107 Powder outflow hole 108 Powder outflow pipe 109 Motor 110 Rotating body 111 Fixed shaft 112 Arching C Powder conduit center axis H Inner hole center axis t Cavity C 'Cone body center axis H' Hopper center axis

Claims (4)

  A hopper having a powder input port and a powder discharge port directed downward, a cylindrical powder conduit standing in a circumferential direction below the powder discharge port and having an inner hole, and a powder conduit A powder supply device comprising an extrudate provided in a non-contact state with respect to the lower end of the powder and a drive device for rotating the powder conduit, wherein the central axis of the inner diameter of the powder conduit is A powder supply apparatus characterized by being eccentric with respect to a central axis. 2. The powder supply apparatus according to claim 1, wherein an inner hole of the powder conduit gradually increases in diameter downward. The extruded body is composed of a flange portion and a conical portion protruding from the upper surface of the flange portion, and a recess is formed on the outer periphery of the cone portion on the upper surface of the flange portion. Powder supply equipment. The powder according to any one of claims 1 to 3, further comprising a moving mechanism that allows the extrudate to move while being separated horizontally and vertically with respect to a lower end portion of the powder conduit. Feeding device.

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