JP6602153B2 - Powder compression molding equipment - Google Patents

Description

  The present invention relates to a powder compression molding apparatus.

  Powder that has a rotary disc with a mortar and upper and lower punches. The upper and lower punches move up and down in response to the rotation of the rotator and compress the powder material in the mortar to mold tablets. Body compression molding devices are known. When the powder compression molding apparatus is operated continuously, the operation of each member constituting the powder compression molding apparatus is caused by the operation of the drive motor or the worm speed reducer that converts the rotation of the drive motor into the rotation of the rotating disk. The temperature rises.

  In particular, when the temperatures of the mortar, the upper punch and the lower punch rise to the vicinity of the melting point of the charged powder material, so-called sticking occurs in which the powder material adheres to the surfaces of the mortar, the upper punch and the lower punch. Further, due to the temperature rise, the mortar, the upper punch and the lower punch, which are mainly made of a metal material, are thermally expanded, which affects the shape and weight of the molded product. Sticking and thermal expansion of each member are major problems that impair the quality of the molded product.

  Therefore, in the powder compression molding apparatus described in Patent Document 1, a heat exchanger is provided to cool each member, and the entire interior of the apparatus is cooled.

Japanese Utility Model Publication No. 6-23696

  However, in the powder compression molding apparatus of Patent Document 1, since the heat exchanger is disposed in the lower housing that is isolated from the upper housing in which the rotating disk and the upper and lower irons are disposed, It is inefficient to cool the panels.

  Incidentally, in the powder compression molding apparatus, there is a problem caused by the powder material floating inside the apparatus as a problem other than sticking and thermal expansion of each member. That is, the powder material to be compressed floats inside the apparatus and enters and stays in necessary gaps between the members such as the inner peripheral surface of the die and the outer peripheral surface of the lower punch. Unnecessary powder material staying in the gaps aggregates when left untreated and becomes a frictional force that prevents the upper and lower eyelids from moving up and down, that is, a resistance force, which causes the quality of the molded product to become unstable.

  An object of this invention is to provide the powder compression molding apparatus which cools a rotary disk etc. efficiently and prevents the bad influence by the powder material which floats.

  According to an aspect of the present invention, a rotating disk including a plurality of mortars arranged on concentric circles, a plurality of upper eyelets provided on the rotating disk and disposed above each of the mortars, and the rotation A plurality of lower punches provided on a plate and arranged below each of the mortars, and the upper and lower punches move up and down in accordance with the rotation of the rotary plate, whereby powder in the die A powder compression molding apparatus for compressing and molding a body material, wherein the airflow generator generates an airflow in a radial direction in the rotation of the rotating disk, which is an airflow with respect to the plurality of upper eyelids or the plurality of lower eyelids. A powder compression molding apparatus is further provided.

  According to another aspect of the present invention, there is provided a powder compression molding apparatus, wherein the airflow generator generates at least the airflow with respect to the upper eyelid.

  According to another aspect of the present invention, there is provided a powder compression molding apparatus, wherein the air flow generator generates the air flow with respect to the lower eyelid.

  According to another aspect of the present invention, there is provided a powder compression molding apparatus, wherein the airflow in the radial direction with respect to the upper eyelid is outward, and the airflow in the radial direction with respect to the lower eyelid is inward. Is done.

  According to another aspect of the present invention, there is provided a powder compression molding apparatus, wherein a wind speed of the airflow in the radial direction with respect to the upper heel is smaller than a wind speed of the airflow in the radial direction with respect to the lower heel. .

  According to another aspect of the present invention, there is provided a powder compression molding apparatus, wherein the airflow is also directed to the rotating disk.

  According to the aspect of the present invention, there is provided a common effect of providing a powder compression molding apparatus that efficiently cools a rotating disk or the like and prevents an adverse effect due to a floating powder material.

1 is a schematic cross-sectional view showing an entire powder compression molding apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged schematic cross-sectional view showing a main part of the powder compression molding apparatus of FIG. 1. FIG. 3 is an enlarged schematic cross-sectional view showing a main part of the powder compression molding apparatus of FIG. 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are marked with common reference numerals throughout the drawings. FIG. 1 is a schematic cross-sectional view showing an entire powder compression molding apparatus 1 according to an embodiment of the present invention, and FIG. 2 is an enlarged schematic cross-sectional view showing a main part of the powder compression molding apparatus 1 of FIG. .

  The entire powder compression molding apparatus 1 is protected from the surrounding environment by a housing 2. The housing 2 has a lower housing 3 and an upper housing 4, and the internal space of the lower housing 3 and the internal space of the upper housing 4 are isolated from each other.

  Inside the lower housing 3, a fan 5 that releases heat in the lower housing 3 to the outside, a drive motor 6, a worm speed reducer 7 that cooperates with the drive motor 6, and a rotation connected to the worm speed reducer 7 And a shaft 8. The rotating shaft 8 extends upward toward the inside of the upper housing 4 while being supported by the bearing 9. That is, the rotation shaft 8 can rotate around a rotation axis parallel to the vertical axis. The worm speed reducer 7 converts the rotation of the drive motor 6 into the rotation of the rotary shaft 8.

  In the upper housing 4, there are a rotating disk 10 connected to the rotating shaft 8 and rotating integrally, a mortar 11 provided on the rotating disk 10, an upper punch 12 disposed above the mortar 11, and a mortar. 11 and a lower barb 13 disposed below the bar 11. Specifically, the turntable 10 includes a die table 14, an upper rotor 15, and a lower rotor 16. The die table 14, the upper rotor 15, and the lower rotor 16 are integrally coupled by fastening means such as screwing.

  The die table 14 is an annular disc and is disposed between the upper rotor 15 and the lower rotor 16. The die table 14 is provided with a plurality of through holes arranged at equal intervals on a concentric circle, and a die 11 having a cylindrical inner surface shape is arranged in each through hole. That is, the die table 14 includes a plurality of dies 11 arranged on concentric circles.

  The upper rotor 15 has an upper flange portion 17 spaced from the die table 14 in the rotation axis direction, and the lower rotor 16 has a lower flange portion 18 spaced from the die table 14 in the rotation axis direction. The upper flange portion 17 and the lower flange portion 18 are provided with through holes at positions corresponding to the plurality of mortars 11 arranged on the die table 14. In each of the through holes of the upper flange portion 17 of the upper rotor 15, the upper flange 12 is arranged so as to be movable up and down, and in each of the through holes of the lower flange portion 18 of the lower rotor 16, the lower flange 13 is vertically moved. It is arranged to be movable. Thereby, each of the set of the corresponding mortar 11, the upper punch 12, and the lower punch 13 is arranged in the same straight line.

  The upper flange 12 is longer than the thickness of the upper flange portion 17, and the lower flange 13 is formed longer than the thickness of the lower flange portion 18. A concave surface corresponding to the shape of the product to be molded is formed on the front end surface of the upper punch 12 inserted into the mortar 11, and is molded on the front end surface of the lower punch 13 inserted into the mortar 11. Concave surfaces are formed according to the shape of the product. A flange-shaped upper collar head portion 12a is formed at the rear end of the upper flange 12 protruding above the upper flange portion 17, and a flange-shaped flange is formed at the rear end of the lower flange 13 protruding below the lower flange portion 18. A lower arm head part 13a is formed.

  The upper eyelid head portion 12 a of the upper eyelid 12 is guided to move up and down by an upper eyelid guide 19 disposed above the rotating disk 10. The lower eyelid head portion 13a of the lower eyelid 13 is guided to move up and down by the lower eyelid guide 20 disposed below the rotating disk. The upper eyelid guide 19 and the lower eyelid guide 20 are supported by a support member (not shown) and are blocked from the rotational movement of the turntable 10.

  At the position where the powder material is compression-molded, an upper pressure roll 21 is disposed above the turntable 10 so as to come into contact with the upper head 12a of the upper collar 12 and press the upper collar 12 downward. Below 10, a lower pressure roller 22 is disposed that contacts the lower arm 13 a of the lower arm 13 and presses the lower arm 13 upward.

  The upper rod 12 and the lower rod 13 are relatively moved along the upper rod guide 19 and the lower rod guide 20 by the rotation of the turntable 10, and are guided so as to move in the vertical direction. When the rotating upper punch 12 and the lower punch 13 come close to the position where the powder material is compression molded, the front end of the lower punch 13 is inserted into the die 11 from below to form the bottom, and the supplied powder Hold the material. Next, the front end portion of the upper punch 12 is inserted into the mortar 11 from above, and the upper punch 12 and the lower punch 13 are pressed by the upper pressure roll 21 and the lower pressure roller 22, respectively, and compression molding of the powder material is performed. Is done.

  An annular cover member 23 that covers the upper part of the rotating disk 10 is attached to the inner side in the radial direction of the annular upper guide 19, and the cover member 23 is blocked from the rotational movement of the rotating shaft 8 by the bearing 24. Yes. Since a recess is formed on the upper surface of the upper rotor 15 of the turntable 10, a space 25 is defined by the upper surface of the upper rotor 15 and the lower surface of the cover member 23. A vent hole 26 communicating with the space 25 is formed in the cover member 23.

  A first vent pipe 27 is connected to the vent hole 26 of the cover member 23 so that air can be supplied into the space 25 or sucked from the space 25. In addition, a second vent pipe 28 is disposed in the vicinity of the outside of the lower flange portion 18 of the turntable 10 so that air can be supplied. As shown in FIG. 1, the first vent pipe 27 and the second vent pipe 28 are connected to one third vent pipe 29, and the third vent pipe 29 is connected to the air flow generator 30. . The powder material is supplied from a hopper 31 provided on the upper portion of the housing 2.

  In this embodiment, the airflow generator 30 generates a cold airflow that is lower in temperature than the temperature in the housing 2 of the powder compression molding apparatus 1, and the first vent pipe 27 and the second vent pipe via the third vent pipe 29. A cold airflow (e.g., about 18 degrees) is released from 28. In addition, you may comprise the 1st ventilation pipe 27 and the 2nd ventilation pipe 28 so that it may be respectively connected to two airflow generators so that an airflow and temperature can be controlled independently.

  The cold air flow discharged from the first vent pipe 27 is supplied into the space 25 and blown against the turntable 10. The cold airflow blown to the turntable 10 turns its direction while cooling the turntable 10, particularly the upper rotor 15, and blows out radially outward (arrow A). Thereby, the cold airflow sequentially cools the upper rod 12, particularly the portion of the upper rod 12 protruding upward from the upper flange portion 17 of the upper rotor 15 in accordance with the rotation of the rotating disk 10. When the portion of the upper collar 12 protruding upward from the upper flange portion 17 is cooled, the entire upper collar 12 is also cooled by heat conduction. When the turntable 10 is cooled, the die 11 is also cooled by heat conduction.

  A part of the cold airflow that abuts on the upper flange 12 protruding upward from the upper flange portion 17 moves down the gap between the outer peripheral surface of the upper flange 12 and the inner peripheral surface of the through hole of the upper flange portion 17. The unnecessary powder material that stays in the gap is wiped out.

  The cold air flow discharged from the second vent pipe 28 blows through radially inward with respect to the rotation of the turntable 10 (arrow B). Thereby, the cold airflow sequentially cools the lower rod 13, particularly the portion of the lower rod 13 protruding downward from the lower flange portion 18 of the lower rotor 16 according to the rotation of the rotating disk 10, and further, the rotating disk 10, In particular, the lower rotor 16 is cooled. When the portion of the lower rod 13 protruding downward from the lower flange portion 18 is cooled, the entire lower rod 13 is also cooled by heat conduction. When the turntable 10 is cooled, the die 11 is also cooled by heat conduction.

  A part of the cold airflow contacting the lower flange 13 protruding downward from the lower flange portion 18 moves up the gap between the outer peripheral surface of the lower flange 13 and the inner peripheral surface of the through hole of the lower flange portion 18. The unnecessary powder material that stays in the gap is wiped out.

  Furthermore, the second vent pipe 28 may be arranged at a position where the cold airflow blows upward at the timing when the front end portion of the lower punch 13 is inserted into the mortar 11 from below to form the bottom. That is, the cold airflow discharged from the second ventilation pipe 28 arranged so as to meet this timing is between the outer peripheral surface of the lower collar 13 and the inner peripheral surface of the through hole of the lower flange portion 18 as described above. After blowing upward through this gap, it further rises and blows upward through the gap between the outer peripheral surface of the lower punch 13 and the inner peripheral surface of the die 11. Thereby, unnecessary powder material staying in the gap between the outer peripheral surface of the lower punch 13 and the inner peripheral surface of the die 11 can be wiped out.

  Furthermore, as described above, the cold air flowing through the gap plays a role of a seal, and also has an effect of preventing entry into the gap. Note that the powder material staying in the gap and swept away is collected by a dust collector (not shown).

  According to the embodiment of the present invention, it is possible to efficiently cool the turntable 10, the mortar 11, the upper punch 12, the lower punch 13, and the like, and to prevent adverse effects due to the floating powder material. That is, since the cold airflow is directly blown from above and below to the turntable 10, the upper rod 12 and the lower rod 13, each member is efficiently cooled, and sticking and thermal expansion of each member are prevented. Is done. Moreover, since the stagnation of unnecessary powder material entering the gap is wiped out by the cold airflow from above and below, it is possible to prevent the generation of a resistance force that hinders the vertical movement of the upper rod 12 or the lower rod 13. .

  According to the above-described embodiment, the airflow generator 30 generates a cold airflow, but may generate a room temperature airflow or a warm airflow higher than the room temperature when the melting point of the powder material is high. That is, the airflow generator 30 may be configured to generate an airflow having a predetermined temperature. Even if it is an air flow at room temperature or a warm air flow higher than room temperature, the powder material in the gap can be wiped out, and the effect of preventing the generation of resistance is achieved.

  According to the embodiment described above, a radially outward air flow with respect to the upper rod 12 and a radially inward air flow with respect to the lower rod 13 are generated, but the air flow generator 30 is configured to be sucked, You may make it produce | generate the air flow inside radial direction with respect to the collar 12, and the air flow outside radial direction with respect to the lower collar 13. On the other hand, the configuration of the airflow generator 30 is not changed, and the first vent pipe 27 is arranged in the vicinity of the outside of the upper flange portion 17 of the turntable 10, and the second vent pipe 28 is arranged immediately below the lower rotor 16. A radially inner airflow with respect to the upper eyelid 12 may be generated, and an radially outward airflow with respect to the lower eyelid 13 may be generated.

  The first vent pipe 27 and the second vent pipe 28 are arranged in the same direction so as to generate an air flow in the same direction in the radial direction on the upper collar 12 and the lower collar 13, that is, an outward or inward air stream. Also good. Furthermore, with respect to the above-described embodiment or the modification described here, the direction of the air flow, the temperature of the air flow, and the like can be arbitrarily set by using the air flow generators 30 independent of the first vent tube 27 and the second vent tube 28, respectively. You may combine. Any of these modifications is preferably configured such that the airflow is directed to the turntable 10.

  It is preferable that the wind speed of the radial airflow with respect to the upper rod 12 is smaller than the wind speed of the radial airflow with respect to the lower rod 13. This is because the lower punch 13 is in a position inserted into the mortar 11 earlier than the upper punch 12, so the air flow in the first ventilation pipe 27 is between the upper flange 12 and the upper flange portion 17. The air flow in the second ventilation pipe 28 should be wiped off the gap between the lower rod 13 and the lower flange portion 18 and the gap between the lower rod 13 and the die 11, whereas the gap should be cleared. is there. Further, since the powder material wiped out from the gap between the upper punch 12 and the upper flange portion 17 may enter the gap between the lower punch 13 and the die 11, it is possible to wipe it out. It is.

  Depending on the nature of the powder material, only one of the first vent pipe 27 and the second vent pipe 28 is arranged to generate only the airflow for the upper collar 12 or only the airflow for the lower collar 13. You may make it do.

  Table 1 shows the results of experiments conducted to verify the cooling effect according to the embodiment of the present invention. The apparatus used for the experiment was a powder compression molding apparatus (turret exchange rotary press “MZ400”) (hereinafter referred to as “MZ400”) manufactured by Mori Machinery Co., Ltd., and the powder compression molding apparatus was used for 8 hours. The powder material was continuously compression-molded over the period. Table 1 shows the temperature that rises after 8 hours for each measurement site when the cold air flow is supplied and when it is not supplied, that is, for each presence or absence of the cold air flow, as compared with before the operation of the apparatus. In particular, the difference in temperature rise between the upper eyelid head part, the die table and the lower eyelid head part was remarkable, and a cooling effect was recognized.

  An experiment was conducted on the effect of suppressing sticking by using MZ400 having a cooling effect as shown in Table 1. The powder material used was a tableting powder for antipyretic analgesics containing ibuprofen (melting point: about 60 to 65 degrees). The surface of the upper and lower eyelids was visually observed every hour from the start of compression molding to confirm the presence or absence of sticking. As a result of the experiment, when there was a cold air flow, sticking was not confirmed even during continuous operation for 10 hours. On the other hand, in the absence of a cold airflow, the initial symptoms of sticking were confirmed on 5 of 45 out of 45 after 5 hours. Therefore, the sticking suppression effect of cold airflow was recognized.

  Next, 10 hours of continuous operation for 8 hours was performed using MZ400, and the number of times that the apparatus stopped abnormally during that time was counted. The MZ 400 stops its operation as abnormal when a predetermined or more resistance force that inhibits the vertical movement of the upper rod and the lower rod is applied. The resistance force is measured by pressure sensors provided on the upper and lower eyelids, respectively. The powder material used is a powder for tableting for common cold containing ibuprofen (melting point: about 60 to 65 degrees). The results of the experiment are shown in Table 2.

  According to Table 2, the stop rate when there was no cold air flow was 80%, while the stop rate when there was a cold air flow was greatly improved to 20%. The breakdown of the stop rate of 80% when there was no cold airflow was 45% for the upper eyelid abnormality, 45% for the lower eyelid abnormality, and 10% for the others. The breakdown of the stopping rate of 20% with cold air flow was 0% for upper eyelid abnormalities, 70% for lower eyelid abnormalities, and 30% for others. Since the upper heel abnormality was 0%, it was found that the improvement effect by the cold air flow from the first vent pipe was particularly large, that is, the cold air flow radially outward wiped out the powder material. It was.

  Subsequently, the same experiment was conducted using another powder material. The powder material used is a tableting powder for a complex vitamin preparation (melting point: about 65 to 70 degrees). The results of the experiment are shown in Table 3.

  According to Table 3, the stopping rate when there was no cold airflow was 100%, while the stopping rate when there was a cold airflow was significantly improved to 0%. The breakdown of the stop rate of 100% in the case of no cold airflow was 30% for the upper eyelid abnormality, 60% for the lower eyelid abnormality, and 10% for the others.

  According to the MZ400 described above, a particularly advantageous effect is obtained in compression molding of a powder material having a melting point of 60 degrees or more.

DESCRIPTION OF SYMBOLS 1 Powder compression molding apparatus 8 Rotating shaft 10 Rotating disk 11 Die 12 Upper iron 13 Lower iron 14 Die table 15 Upper rotor 16 Lower rotor 17 Upper flange part 18 Lower flange part 19 Upper iron guide 20 Lower iron guide 23 Cover member 24 Bearing 25 space 26 vent hole 27 first vent pipe 28 second vent pipe 30 air flow generator

Claims (2)

A rotating disk provided with a plurality of mortars arranged concentrically, a plurality of upper jaws provided on the rotating disk and arranged above each of the mortars, and each of the mortars provided on the rotating disk And a plurality of lower punches arranged below the upper plate, and the upper punch and the lower punch move up and down in accordance with the rotation of the rotating disk, thereby compressing and molding the powder material in the die A body compression molding apparatus,
An airflow generator for generating airflow in a radial direction in rotation of the rotating disk, the airflow for the plurality of upper eyelids or the plurality of lower eyelids ,
The air flow generator generates at least the air flow for the upper arm;
The air flow generator generates the air flow for the lower arm;
The airflow in the radial direction with respect to the upper eyelid is an outward direction, and the airflow in the radial direction with respect to the lower eyelid is an inward direction,
A powder compression molding apparatus , wherein a wind speed of the airflow in the radial direction with respect to the upper heel is smaller than a wind speed of the airflow in the radial direction with respect to the lower heel . The powder compression molding apparatus according to claim 1 , wherein the airflow is also directed to the rotating disk.

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