JP2007293616A - Screw feeder of powder raw material conveying apparatus and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw feeder free from a defect such as resin crack in a powder raw material conveying apparatus for conveying a powder raw material stored in a storage, and a manufacturing method thereof. <P>SOLUTION: The screw feeder 20 is provided with a screw 22 having a screw blade 22a integrally molded thereon with a thermoplastic resin such as polyoxymethylene along a longitudinal direction on an outer periphery of a rotary axis 21(a metal axis made of aluminum, stainless steel or brass), and the screw having a flange 22b with holes 22c on its one end. The rotary axis 21 is provided with a knurling 21a to rotate the screw 22 in synchronization therewith. One end of the rotary axis 21 is provided with a female screw machined in a direction opposite to the spiral direction of the screw blade 22a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a screw feeder of a powder raw material carry-out device that is provided in a cup-type beverage vending machine or a beverage dispenser and carries out powder raw materials such as sugar and cream stored in a storage section, and a method for manufacturing the same.

  For example, what is shown in FIG. 9 and FIG. 10 is known as this kind of powder raw material carrying-out apparatus. The powder raw material carry-out device 60 includes a storage container 11 that stores powder raw materials such as sugar and cream, a cover 13 that covers the upper end opening of the storage container 11 so as to be rotatable about a shaft 12, and the storage container 11 includes hooks 11a and 11a. A detachably mounted unloading portion 61, a cylindrical supply port 62 formed to project forward at the lower front end of the unloading portion 61, and a bottom of the unloading portion 61, and supply the powder raw material to the supply port A rotatable screw feeder 70 for unloading from 62, a drive motor 18 for rotating the screw feeder 70, a drive pin 19 attached to a drive shaft of the drive motor 18, and the rotation of the drive motor 18 are driven. A rotating claw 73 that is transmitted to the screw feeder 70 via the pin 19 is disposed, and formed above the screw 72 of the screw feeder 70. The second gear 17 meshed with the first gear 16 meshed with the spiral blade 72 a is rotatably provided, and the first gear 16 and the second gear 17 rotate in conjunction with the rotation of the screw feeder 70. (In the direction of the arrow in the figure) to prevent the occurrence of voids in the powder raw material.

In the cup-type beverage vending machine provided with the powder raw material carry-out device 60, when the beverage is pressed by the purchaser and the beverage is selected, the powder raw material carry-out signal is output based on the beverage sales signal, and the drive motor When 18 is rotationally driven, the screw feeder 70 is rotated a predetermined number of times from the drive pin 19 through the rotating claw 73 (counterclockwise direction in the figure), and the powder material between the spiral blades 72a of the screw 72 is left in the figure. Then, a predetermined amount of powder raw material is carried out from the supply port 62 to a mixing bowl (not shown). In the mixing bowl, the powder raw material carried out from the powder raw material carrying-out device 60 and hot water supplied from the hot water tank are stirred and mixed, and the prepared beverage is poured into a cup and delivered to the purchaser (for example, see Patent Document 1). ).
JP 2001-155239 A

  The screw feeder 70 is shown in the side view of FIG. 11 (a), the front view of FIG. 11 (b), and the cross-sectional side view of FIG. As shown in the drawing, a thermoplastic resin is injection-molded on the outer peripheral surface of a rotating shaft (metal shaft) 71 that extends horizontally in the front-rear direction (left-right direction in the figure), and a spiral blade 72a is integrally formed with a screw 72. Has been. The rotary shaft 71 is provided with a knurl 71a so that the rotary shaft 71 and the screw 72 are fixed to rotate synchronously. Furthermore, an external thread 71b threaded in the spiral direction (clockwise direction in the figure) and the reverse direction (counterclockwise direction in the figure) of the spiral blade 72a is provided at one end (right side in the figure) of the rotating shaft 71. It is provided and the rotation claw 73 is screwed.

  When a mold that is manufactured by injection molding of the screw feeder 70 having such a shape is an upper and lower split mold in the drawing, a part of the spiral blade 72a becomes undercut when the screw feeder 70 is released from the molding mold. Cannot be removed from the mold. Therefore, as shown in FIG. 12, the manufacturing method of the screw feeder 70 is such that the opening end surface in which the rotary shaft 71 is inserted into the molding die 80 is closed with a die (not shown), and a thermoplastic resin is formed on the outer peripheral surface of the rotary shaft 71. After forming the screw 72 by injection molding, the mold is opened, and the rotating shaft 71 held by a screw feeder take-out jig (not shown) is rotated (in the counterclockwise direction in the figure), and fixed by the knurled 71a. The screw 72 is forcibly rotated and the screw feeder 70 is taken out from the molding die 80.

  However, this mold release method generates a large resistance between the screw 72, in particular, the surface of the spiral blade 72a and the molding die 80, and a large shear stress is present near the root of the spiral blade 72a of the screw 72 near both ends of the knurled 71a. Is generated and residual molding strain remains. If this molding residual strain changes over time, there is a risk of causing a crack (see FIG. 13) near the root of the spiral blade 72a of the screw 72.

  The present invention has been made in order to solve the above problems, and is a powder raw material carrying-out device for carrying out a powder raw material stored in a storage unit, and a screw feeder that eliminates problems such as resin cracks and a method for manufacturing the screw feeder. The purpose is to provide.

In order to achieve the above object, the screw feeder of the powder raw material carry-out apparatus according to claim 1 of the present invention is integrally formed on the outer peripheral surface of the rotating shaft extending in the horizontal direction along the length direction of the rotating shaft. In a screw feeder of a powder raw material carrying-out device that has a resin cylinder with spiral blades and carries out a powder raw material stored based on rotation of a driving means,
At least one of a hole, a notch, and a protrusion is formed at one end of the resin cylinder with spiral blades.

A screw feeder for a powder raw material carrying-out device according to claim 2 of the present invention is the above-mentioned screw feeder according to claim 1, wherein at least one of a hole, a notch, and a protrusion is formed in a flange provided at one end of the resin cylinder with spiral blades. It is characterized by forming one.
According to a third aspect of the present invention, there is provided a screw feeder manufacturing method comprising: a resin cylinder with a spiral blade integrally molded along a length direction of a metal shaft on an outer peripheral surface of a metal shaft extending in a horizontal direction. A screw feeder of a powder raw material unloading device that unloads the stored powder raw material based on rotation of the driving means,
In the manufacturing method of the screw feeder, in which a thermoplastic resin is injected into a molding die in which the metal shaft is inserted to mold the resin cylinder with spiral blades,
One end of the resin cylinder with spiral blades is provided with connecting means formed of at least one of a hole, a notch, and a projection, and the spiral is formed based on the rotation of the cylindrical rotating means connected through the connecting means. A winged resin cylinder is rotated and released from the molding die.

  A screw feeder manufacturing method according to a fourth aspect of the present invention is the method according to the third aspect, wherein the metal shaft is rotated in synchronism with the rotation of the resin cylinder with spiral blades to release from the molding die. It is characterized by making it.

According to the first aspect of the present invention, since at least one of the hole, the notch, and the protrusion is formed at one end of the resin cylinder with the spiral blade of the screw feeder, the cylindrical rotating means is made of the hole, the notch, and the protrusion. The screw feeder can be taken out from the molding die by connecting to at least one and rotating the resin cylinder with spiral blades.
According to the invention of claim 2, since at least one of the hole, the notch, and the protrusion is formed in the flange provided at one end of the resin cylinder with the spiral blade, the connecting position of the cylindrical rotating means is expanded. And the screw feeder can be easily removed from the molding die.

  According to a third aspect of the present invention, a connecting means formed of at least one of a hole, a notch and a protrusion is provided at one end of the resin cylinder with spiral blades, and the connecting means is connected via the connecting means. Since the resin cylinder with spiral blades is rotated and released from the molding die based on the rotation of the cylinder rotating means, the resin cylinder with spiral blades is rotated along the spiral direction of the spiral blade and molded. When the mold is released from the mold, the rotating shaft rotates in synchronization with the resin cylinder with spiral blades, so that no large shear stress is generated in the resin cylinder with spiral blades, and residual molding strain remains. Therefore, problems such as resin cracking of the resin cylinder with spiral blades due to secular change will not occur.

  According to the invention of claim 4, since the metal shaft is rotated and released from the molding die in synchronization with the rotation of the resin cylinder with the spiral blade, each of the resin cylinder with the spiral blade and the rotation shaft Since the mold is released from the molding die in synchronism with the rotational force, no large shearing stress is generated in the resin cylinder with spiral blades, and no residual molding strain remains. Problems such as resin cracks in the attached resin cylinder are eliminated.

Exemplary embodiments of a screw feeder of a powder raw material carrying-out apparatus and a method for manufacturing the same according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, the same code | symbol is used regarding the same structure as before. Further, the present invention is not limited to the embodiments.
FIG. 1 shows a powder raw material carry-out apparatus equipped with a screw feeder to which the present invention is applied. The powder raw material carry-out device 1 includes a storage container 11 for storing powder raw materials such as sugar and cream, a carry-out unit 14, a rotatable screw feeder 20 for carrying out the powder raw material, provided at the bottom of the carry-out unit 14, A drive motor 18 for rotating the screw feeder 20 is provided.

The storage container 11 is formed in a box shape with a thermoplastic resin, and is detachably attached to the upper side of the carry-out portion 14 with hooks 11a, 11a, and the upper end opening is inclined forward and downward, and a shaft provided at the rear end 12, the cover 13 is rotatably attached, and the powder raw material is charged with the cover 13 opened.
A cylindrical supply port 15 protruding forward is provided at the lower front end portion of the carry-out portion 14, and a screw having a screw 22 formed integrally with a spiral blade 22 a at the bottom of the carry-out portion 14 communicating with the supply port 15. A feeder 20 is disposed, and a rotating claw 23 is attached to one end thereof.

  A drive motor 18 that rotationally drives the screw feeder 20 is disposed behind the bottom of the carry-out portion 14, a drive pin 19 is attached to the drive shaft of the drive motor 18, and the drive motor 18 rotates (counterclockwise direction in the figure). When driven and the screw feeder 20 is rotated from the drive pin 19 through the rotating claw 23 (counterclockwise direction in the figure), the powder raw material between the spiral blades 22a of the screw 22 is sent leftward in the figure. It is carried out from the supply port 15.

  A first gear 16 is rotatably provided above the screw feeder 20 so as to mesh with the spiral blade 22a, and a second gear 17 is meshed with the first gear 16 and rotatably provided on the upper front side thereof. . In the storage container 11 and the unloading part 14, when the screw feeder 20 rotates and the powder raw material unloading operation is performed, the powder raw material moves downward, and a phenomenon occurs in which the powder raw material has a cavity during the movement process. However, when the first gear 16 and the second gear 17 are rotated in conjunction with the rotation of the screw feeder 20, the powder raw material is agitated and stably moved downward, so that a cavity is generated and the powder raw material is carried out. Is prevented from becoming impossible.

  2 shows the screw feeder 20, FIG. 2 (a) is a side view, FIG. 2 (b) is a front view, and FIG. 2 (c) is a cross-sectional view of the AA portion of FIG. It is a side view. As shown in the figure, the screw feeder 20 is made of polyoxygen along the longitudinal direction on the outer peripheral surface of a rotary shaft (a metal shaft such as aluminum, stainless steel, brass) 21 extending horizontally in the front-rear direction (left-right direction in the figure). It has a screw (resin cylinder with spiral blades) 22 in which a spiral blade 22a is integrally molded with a thermoplastic resin such as methylene, and a flange 22b (connecting means) provided with a hole 22c is formed at one end thereof. . The rotary shaft 21 is provided with a knurl 21a so that the screw 22 rotates synchronously. Further, one end (right side in the figure) of the rotary shaft 21 is provided with a screw 21b for being threaded in the spiral direction (clockwise direction in the figure) and the reverse direction (counterclockwise direction in the figure) of the spiral blade 22a. Then, the rotating claw 23 is screwed to the female screw 21b (see FIG. 3).

FIG. 4 shows a sectional side view of the mold 50 for molding the screw feeder 20. After the rotary shaft 21 is inserted into the mold 50, the opening end face is closed with a mold (not shown), and the rotary shaft 21. A screw 22 is formed by injection molding a thermoplastic resin such as polyoxymethylene on the outer peripheral surface.
In FIG. 5, the rotary shaft 21 is inserted into the molding die 50, and a thermoplastic resin such as polyoxymethylene is formed on the outer peripheral surface thereof to form the screw 22, and then the screw feeder 20 is taken out from the molding die 50. A screw rotating jig (cylindrical rotating means) 51 is shown, and the screw rotating jig 51 is provided with a protrusion 51b to be inserted into the hole 22c of the flange 22b.

  Then, as shown in FIG. 6, the opening end surface in which the rotating shaft 21 is inserted into the molding die 50 is closed with a die (not shown), and a thermoplastic resin such as polyoxymethylene is injection-molded on the outer peripheral surface of the rotating shaft 21. Then, after the screw 22 is formed, the mold is opened, the protrusion 51b is inserted into the hole 22c of the flange 22b, and the screw rotating jig 51 is rotated (counterclockwise direction in the figure). Rotate along the spiral direction and release from the molding die 50, and the rotating shaft 21 fixed by the knurling 21 a also rotates at the same time, and the screw feeder 20 is taken out from the molding die 50.

  In this way, the hole 22c is formed in the flange 22b provided at one end of the screw 22, and the protrusion 51b of the screw rotating jig 51 is fitted into the hole 22c so that the screw 22 is rotated and released from the molding die 50. Then, the screw 22 rotates along the spiral direction of the spiral blade 22 a and is released from the molding die 50, and accordingly, the rotary shaft 21 rotates in synchronization with the screw 22. No stress is generated, no molding residual strain remains, and problems such as resin cracking of the screw 22 due to secular change do not occur.

  Further, the rotating shaft 21 may be rotated in synchronism with the rotation of the screw 22 to release from the molding die 50. In this way, when a rotational force synchronized with each of the screw 22 and the rotary shaft 21 is applied to release the mold from the molding die 50, a large shear stress is not generated in the screw 22, and a molding residual strain remains. This eliminates the occurrence of problems such as resin cracking of the screw 22 due to secular change.

  FIG. 7 shows an example in which a notch 32c is provided in the flange 32b of the screw feeder 30, FIG. 7 (a) is a side view, FIG. 7 (b) is a front view, and FIG. 7 (c) is FIG. It is the cross-sectional side view which looked at the AA part in the arrow direction. As shown in the figure, the screw feeder 30 has a screw 32 in which a spiral blade 32a is integrally molded with a thermoplastic resin such as polyoxymethylene on the outer peripheral surface of the rotating shaft 21, and a notch 32c is formed at one end thereof. The flange 32b provided with is formed. Thus, even if the notch 32c is provided in the flange 32b and the screw 32 is rotated by the screw rotating jig and released from the molding die, the shearing stress is not generated in the screw 32, and the molding residue remains. Strain does not remain, and it is possible to eliminate the occurrence of problems such as resin cracking of the screw 32 due to aging.

  FIG. 8 shows an example in which a protrusion 42c is provided on the flange 42b of the screw feeder 40, FIG. 8 (a) is a side view, FIG. 8 (b) is a front view, and FIG. 8 (c) is A in FIG. It is the cross-sectional side view which looked at -A part in the arrow direction. As shown in the figure, the screw feeder 40 has a screw 42 in which a spiral blade 42a is integrally molded with a thermoplastic resin such as polyoxymethylene on the outer peripheral surface of the rotating shaft 21, and a projection 42c is formed at one end thereof. The provided flange 42b is formed. Thus, even if the protrusion 42c is provided on the flange 42b and the screw 42 is rotated with a screw rotating jig and released from the molding die, the shear stress is not generated on the screw 42, and the molding residual strain is not generated. And the occurrence of problems such as resin cracking of the screw 42 due to secular change can be eliminated.

It is a cross-sectional side view which shows the powder raw material carrying-out apparatus provided with the screw feeder which is embodiment of this invention. It is a figure which shows the screw feeder which is embodiment of this invention. It is a figure which shows the screw feeder shown in FIG. It is a cross-sectional side view which shows the screw feeder molding die which is embodiment of this invention. It is a figure which shows the rotation jig of the screw feeder shown in FIG. It is a cross-sectional side view which shows mold release of the screw feeder which is embodiment of this invention from a shaping | molding die. It is a figure which shows the screw feeder which is embodiment of this invention. It is a figure which shows the screw feeder which is embodiment of this invention. It is the external view which showed the conventional powder raw material carrying-out apparatus. FIG. 10 is a cross-sectional side view showing the powder raw material carry-out device shown in FIG. 9. It is a figure which shows the screw feeder shown in FIG. It is a cross-sectional side view which shows mold release of the screw feeder shown in FIG. It is a figure which shows the conventional screw feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder raw material unloading apparatus 11 Storage container 14 Unloading part 15 Supply port 18 Drive motor 20 Screw feeder 21 Rotating shaft 22 Screw 22a Spiral blade 22b Flange 22c Hole 32c Notch 42c Protrusion 50 Molding die 51 Screw rotation jig

Claims (4)

It has a resin cylinder with spiral blades integrally formed along the length direction of the rotating shaft on the outer peripheral surface of the rotating shaft extending in the horizontal direction, and carries out the stored powder raw material based on the rotation of the driving means In the screw feeder of the powder raw material carry-out device to
A screw feeder for a powder raw material carry-out device, wherein at least one of a hole, a notch, and a protrusion is formed at one end of the resin cylinder with spiral blades.   The screw feeder of the powder raw material carrying-out apparatus according to claim 1, wherein at least one of a hole, a notch, and a protrusion is formed in a flange provided at one end of the resin cylinder with spiral blades. It has a resin cylinder with spiral blades molded integrally along the length direction of the metal shaft on the outer peripheral surface of the metal shaft extending in the horizontal direction, and carries out the stored powder raw material based on the rotation of the drive means A screw feeder for a powder raw material carrying device
In the manufacturing method of the screw feeder, in which a thermoplastic resin is injected into a molding die in which the metal shaft is inserted to mold the resin cylinder with spiral blades,
One end of the resin cylinder with spiral blades is provided with connecting means formed of at least one of a hole, a notch, and a protrusion, and the spiral is formed based on the rotation of the cylindrical rotating means connected through the connecting means. A method of manufacturing a screw feeder, characterized in that a resin cylinder with blades is rotated and released from the molding die.   4. The method of manufacturing a screw feeder according to claim 3, wherein the metal shaft is rotated in synchronism with the rotation of the resin cylinder with spiral blades to release from the molding die.

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