JP2017159304A - Rotary type powder compression molder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elongate the lifetime of a rotary type powder compression molder that manufactures annular molded articles.SOLUTION: A rotary type powder compression molder is configured which comprises: a lower pestle 6 equipped with an outer pestle 60, having a shaft hole 64 of the outer pestle 60, and a center pestle 65 inserted through the shaft hole 64 of the outer pestle 60; a rotary disk 3 equipped with a mortar hole 4, filled with powder and keeping the tip part of the lower pestle 6 inserted through, and a lower pestle holding part 33 holding the trunk 62 of the outer pestle 60 to be slidable vertically; center pestle supports 70, 80, coupled with the center pestle 65, arranged in a space part 621 formed in the trunk 62 of the outer pestle 60 to communicate with the shaft hole 64 and opened outward; and a fall prevention body 90 fixed on the rotary disk 3 to support parts 72, 80, projected outward from the outer periphery of the trunk 62 of the outer pestle 60 in the center pestle supports 70, 80, to be rotatable around the axis.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rotary powder compression molding machine that compresses powder to form pharmaceutical tablets, foods, electronic parts and the like.

  A mortar hole is provided on the table of the rotating table, and upper and lower heels are slidably held above and below each mortar hole, and the mortar hole and heel are both rotated horizontally to 2. Description of the Related Art A rotary powder compression molding machine is known that compresses and molds powder filled in a mortar when a pair passes between an upper roll and a lower roll.

  In a molding machine for producing an annular molded product such as a troche (see, for example, the following patent document), a lower rod is a hollow outer rod having a shaft hole and a central rod inserted through the shaft hole. (Inner). The distal end portion, that is, the upper end portion of the center rod projects upward from the distal end portion, that is, the upper end portion of the outer casing. When a lower punch is inserted into the mortar, an annular space surrounded by the inner peripheral surface of the mortar, the outer peripheral surface of the central punch, and the upper end surface of the outer punch is formed. Fill.

  On the other hand, a concave hole for receiving the upper end portion of the center rod is formed in the upper end portion, that is, the lower end portion of the upper collar. When the upper punch is inserted into the mortar hole filled with the powder, the central punch fits into the concave hole of the upper punch, and the lower end surface of the upper punch closes the annular space in the mortar from above. The upper and lower ridges compress the powder in the mortar hole to form an annular molded product.

  The outer punch of the lower punch is held so as to be slidable up and down by a cylindrical hole holding portion provided in the rotating disk, but the central punch is not displaced relative to the rotating disk and the mortar hole. Fixed. In order to fix the center rod, a long hole-shaped pin insertion hole that extends in the vertical direction and communicates with the shaft hole is formed in the body of the outer rod, and a round hole-like pin that penetrates the center rod in the horizontal direction. Each fitting hole is formed, and the center rod is assembled to the turntable by inserting the set pin from the outside of the turntable into the pin fitting hole via the pin insertion hole and fitting it.

JP 2000-225494 A

  In a conventional molding machine, a set pin for fixing the center rod passes through the body portion of the outer casing, and the outer casing does not rotate about its axis. Therefore, as the outer casing slides up and down, uneven wear occurs where the area is worn intensively between the outer periphery of the outer casing and the inner periphery of the cage holding section of the rotating disk, and the life of these members is shortened and replaced. There was a tendency to increase the frequency.

  An object of the present invention is to extend the life of components of a rotary powder compression molding machine that manufactures an annular molded product.

  In order to solve the above-described problems, in the present invention, an outer casing having a shaft hole, a lower casing provided with a central casing inserted through the axial hole of the outer casing, and the lower casing filled with powder. A mortar hole into which the distal end portion of the outer casing is inserted, a rotary plate provided with a lower punch holding section that slidably holds the barrel section of the outer casing, and a shaft hole formed in the trunk section of the outer casing. A center rod support that is coupled to the central rod and is disposed in a space that is open to the outside, and a portion that protrudes outward from the outer periphery of the body portion of the outer rod in the central rod support The rotary powder compression molding machine comprising the fall prevention body fixed to the rotating disk, which is supported from below so as to be rotatable around the axis of the outer casing.

  If it is such, it will become possible for the outer rod to rotate around the axis within the rod holder of the rotating disk. Therefore, uneven wear does not occur between the outer periphery of the outer cage and the inner circumference of the cage holding portion of the rotating disk, and the life of these members can be extended.

  In addition, if dust enters and bites between the outer casing of the lower casing and the central casing that form a double structure, a great amount of external force acts to move the outer casing up and down. There is a concern that abnormal wear or damage may occur to other members. The outer shell communicates with the shaft hole at a height position where the powder filled in the mortar hole is compressed to form a molded product so as not to enter the lower heel holding portion. If a dust discharge hole that is open to the outside is formed, it is possible to discharge dust that has entered between the outer casing and the central casing to the outside of the casing through the dust discharge hole. The risk of abnormal wear and damage to the parts is reduced.

  The powder is an aggregate of minute individuals, and is a concept including an aggregate of particles such as so-called granules and an aggregate of powder having a shape smaller than the particles.

  ADVANTAGE OF THE INVENTION According to this invention, the life extension of the structural member of the rotary powder compression molding machine which manufactures an annular molded product can be aimed at.

1 is a side sectional view of a rotary powder compression molding machine according to an embodiment of the present invention. The top view of the turntable part in the embodiment. The expanded view which expands and shows the flow of the manufacturing process of a molded article, and the motion of the wrinkles with respect to the action | operation of a turntable in one Embodiment of the rotary powder compression molding machine of this invention. The disassembled perspective view of the lower eyelid, guide key, guide ring, and fall prevention plate in the embodiment. The principal part perspective view which shows the state which assembled the lower arm, guide key, guide ring, and fall prevention plate in the embodiment. The principal part expanded side sectional view which shows the state of the upper eyelid and the lower eyelid at the time of powder filling in the same embodiment. The principal part expanded side sectional view which shows the state of the upper eyelid and the lower eyelid at the time of powder compression in the same embodiment.

  An embodiment of the present invention will be described with reference to the drawings. First, an overall outline of a rotary powder compression molding machine (hereinafter referred to as “molding machine”) of the present embodiment will be described. As shown in FIG. 1, a standing shaft 2 serving as a rotating shaft is established in a frame 1 of the molding machine, and a turntable 3 is attached to the upper portion of the standing shaft 2 via a connection portion 21.

  The turntable 3 rotates horizontally, that is, rotates around the vertical shaft 2. The turntable 3 includes a table (mortar disk) 31, an upper punch holder 32, and a lower punch holder 33. As shown in FIG. 2, the table 31 has a substantially disk shape, and a plurality of mortar holes 4 are provided at predetermined intervals along the rotation direction on the outer periphery thereof. The mortar hole 4 penetrates the table 31 in the vertical direction. The table 31 may be divided into a plurality of plates. The table 31 itself is not directly formed with the mortar hole 4, but a plurality of mortar members which are separate from the table 31 and can be attached to and detached from the table 31 are attached to the table 31. It is good also as a structure which has drilled the mortar hole penetrated to the up-down direction in each.

  An upper punch 5 and a lower punch 6 are arranged above and below each mortar hole 4. The upper heel 5 and the lower heel 6 (the outer heel 60) are held by the upper heel holding portion 32 and the lower heel holding portion 33 so as to be individually slidable in the vertical direction with respect to the mortar hole 4. . The tip 53 of the upper arm 5 enters and exits the mortar hole 4. The tip 63 of the lower punch 6 is always inserted into the mortar hole 4. The upper arm 5 and the lower arm 6 rotate horizontally, that is, revolve around the axis of the upright shaft 2 together with the rotating disk 3 and the mortar hole 4.

  A worm wheel 7 is attached to the lower end side of the vertical shaft 2. A worm gear 10 meshes with the worm wheel 7. The worm gear 10 is fixed to a gear shaft 9 that is driven by a motor 8. The driving force output from the motor 8 is transmitted to the gear shaft 9 by the belt 11 and rotationally drives the vertical shaft 2 and thus the rotating disk 3 and the upper and lower flanges 5 and 6 through the worm gear 10 and the worm wheel 7.

  A powder that is a raw material of a compression-molded product, such as a pharmaceutical tablet, is filled into the mortar hole 4 from the feed shoe X. The types of the feed shoe X include a stirring feed shoe and an open feed shoe, any of which may be adopted. A powder supply device is used to supply the powder to the feed shoe X. Supply of the powder with respect to the powder supply apparatus is performed from the hopper 19. The hopper 19 is detachable from the molding machine.

  As shown in FIGS. 2 and 3, a preload upper roll 12 that is paired up and down with the upper and lower flanges 5 and 6 sandwiched between the upper and lower flanges 5 and 6 on the revolving track around the vertical shaft 2. And a pre-rolling roll 13, a main-pressing roll 14, and a main-pressing roll 15. The pre-loading roll 12 and the pre-loading roll 13, and the main-pressing roll 14 and the main-pressing roll 15 are arranged so as to compress the powder filled in the mortar hole 4 from above and below with the tip surfaces of the tips 53 and 63. The two cages 5 and 6 are urged in a direction in which they approach each other.

  The upper collar 5 and the lower collar 6 have head parts 51 and 61 pressed by the rolls 12, 13, 14, and 15, respectively, and body parts 52 and 62 having a smaller diameter than the head parts 51 and 61. The upper heel holding portion 32 of the turntable 3 holds the body portion 52 of the upper heel 5 so as to be slidable up and down, and the lower heel holding portion 33 holds the body portion 62 of the lower heel 6 so as to be slidable up and down. To do. The distal end portions 53 and 63 of the trunk portions 52 and 62 are thinner than other portions so as to be inserted into the mortar hole 4 and have a diameter substantially equal to the inner diameter of the mortar hole 4. Due to the revolution of the upper and lower saddles 5 and 6, the rolls 12, 13, 14 and 15 approach the heads 51 and 61 of the upper and lower saddles 5 and 6 and come into contact with the heads 51 and 61. Furthermore, the rolls 12, 13, 14, and 15 push the upper collar 5 downward and push the lower collar 6 upward. During the period when the rolls 12, 13, 14, 15 are in contact with the flat surfaces on the upper and lower ridges 5, 6, the upper and lower ridges 5, 6 continue to apply a certain pressure to the powder in the mortar 4.

  A product discharge unit 16 is configured at a position advanced from the pressurization position by the main roll 14 and the main roll 15 along the rotation direction of the rotary plate 3 and the upper and lower ribs 5 and 6. In the product discharge section 16, the lower punch 6 is raised until the upper end surface of the tip 63 of the lower punch 6 becomes substantially the same height as the upper end of the die hole 4, that is, the upper surface of the table 31, and the molded product in the die hole 4 is removed. Extrude from mortar 4 The product discharge unit 16 includes a damper 17 that guides the molded product pushed out from the mortar hole 4. The molded product pushed out from the mortar 4 comes into contact with the damper 17 by the rotation of the turntable 3, and moves along the damper 17 toward the molded product collection position 18.

  Hereinafter, the structure of the lower collar 6 of the molding machine of this embodiment will be described in detail. The molding machine of this embodiment is used for manufacturing an annular molded product such as a troche. As shown in FIGS. 4 to 7, the lower rod 6 includes a hollow cylindrical outer rod 60 having a shaft hole 64 penetrating in the vertical direction, and a center rod 65 inserted through the shaft hole 64. . The distal end portion, that is, the upper end portion of the center rod 65 projects upward from the distal end portion, that is, the upper end portion 63 of the outer collar 60. When a lower punch is inserted into the mortar hole 4, an annular space surrounded by the inner peripheral surface of the mortar hole 4, the outer peripheral surface of the central punch 65, and the upper end surface of the outer punch 60 is formed. Fill the powder to become.

  The outer rod 60 of the lower rod 6 is held so as to be slidable in the vertical direction by a cylindrical hole-shaped lower rod holding portion 33 provided in the rotating disk 3. On the other hand, the center rod 65 is fixed so as not to be displaced up and down relatively with respect to the turntable 3 and the mortar hole 4. The center rod 65 may have a convex portion 652 on the outer peripheral surface of the lower end thereof.

  A mounting structure for mounting the central rod 65 on the rotating disk 3 in a state where the vertical movement of the central rod 65 is prohibited is a guide key 70 fixed to the base end portion, that is, the lower end portion of the central rod 65, and the guide key 70 is engaged and integrated. The guide ring 80 and the fall prevention plate 90 that supports the guide ring 80 from below are the components.

  The guide key 70 extends in the width direction and has a block-like base 71 whose width dimension is substantially equal to the outer diameter of the body 62 of the outer casing 60, and an engagement piece projecting outward from both side surfaces of the base 71. 72. Both outer side surfaces of the base portion 71 form a partial cylindrical surface shape that is substantially the same shape as the outer peripheral surface of the body portion 62 of the outer casing 60. A shaft hole 73 penetrating in the vertical direction is formed in the central shaft portion of the base 71. In addition, female screw holes 74 that open to both side surfaces of the base portion 71 and communicate with the shaft hole 73 are provided on both left and right sides of the base portion 71. The engagement piece 72 extends from the vicinity of the lower end of the base 71 to both the left and right sides. Both outer side surfaces of the left and right engagement pieces 72 have a partial cylindrical surface shape that is substantially the same shape as the outer peripheral surface of the guide ring 80.

  The guide ring 80 has an annular shape whose inner diameter is substantially equal to the outer diameter of the body portion 62 of the outer casing 60 and whose outer diameter is substantially equal to the outer method of the engaging pieces 72 on the left and right sides of the guide key 70. Two notches 81 that engage with the engaging pieces 72 of the guide key 70 are provided at two positions on the upper surface of the guide ring 80 that are opposed to the left and right. When each engagement piece 72 of the guide key 70 is engaged with each notch 81 of the guide ring 80, the upper surface of the engagement piece 72 received in the notch 81 is substantially flush with the upper surface of the guide ring 80, and The outer surface of the engagement piece 72 is substantially flush with the outer peripheral surface of the guide ring 80.

  The fall prevention plate 90 is a thin plate body having a horseshoe shape in plan view with a center portion cut away. The inner dimension of the notched inner space portion 91 is larger than the outer diameter of the body portion 62 of the outer collar 60, but smaller than the outer diameter of the guide ring 80.

  A slot-like space 621 that extends in the vertical direction while penetrating through the body 62 in the horizontal direction is formed in the lower half of the body 62 of the outer casing 60. The space portion 621 passes through the shaft center of the body portion 62 and communicates with the shaft hole 64.

  In assembling the lower rod 6 into the turntable 3, first, the outer rod 60 is passed through the guide ring 80 in advance, and the guide key 70 is inserted into the space 621, the shaft hole 64 of the outer rod 60, and the guide key 70. The shaft hole 73 is inserted from the side of the body portion 62 so as to overlap with each other in plan view.

  Next, the center rod 65 is inserted into the shaft holes 64 and 73 of the outer rod 60 and the guide key 70, and the concave groove 651 existing on the outer peripheral surface of the lower end portion of the center rod 65 is formed at the height of the female screw hole 74 in the guide key 70. To match. In addition, by using the center rod 65 having the convex portion 652 formed on the outer peripheral surface of the lower end portion, the groove 651 and the female screw are simply inserted through the shaft rod 64 and 73 of the outer rod 60 and the guide key 70. The height with the hole 74 can be easily adjusted.

  A screw 75 for fixing the guide key 70 is screwed into the female screw hole 74 from both the left and right sides of the guide key 70 and tightened. As a result, the opposing ends of the paired screws 75 are tightly fitted into the concave groove 651, and the guide key 70 is fixed to the lower end of the center rod 65 disposed in the outer rod 60.

  Subsequently, the engagement piece 72 of the guide key 70 is engaged with the notch 81 of the guide ring 80 from above. Further, the fall prevention plate 90 is inserted below the guide ring 80 so that the body portion 62 of the outer casing 60 is housed in the inner space 91 of the fall prevention plate 90. Then, the body portion 62 of the outer rod 60 including the center rod 65 and the guide key 70 is inserted into the lower rod holding portion 33 of the turntable 3. The guide key 70 is disposed in the hole of the lower collar holder 33 that holds the body 62 of the lower collar 6, but the guide ring 80 is disposed below the lower end of the hole of the lower collar holder 33.

  Thereafter, the upper surface of the fall prevention plate 90 is brought into contact with the downward surface of the turntable 3, and the end portion 92 facing the inner side of the fall prevention plate 90 is supported by the shelf 34 provided in advance on the turntable 3. . In this state, a screw 94 is inserted into a screw insertion hole 93 formed at the outer end of the fall prevention plate 90, and the fall prevention plate 90 is fixed to the turntable 3 with the screw 94.

  Finally, a lid 611 and an O-ring 612 are attached to close the opening of the shaft hole 64 reaching the lower end of the outer casing 60, that is, the head 61.

  The guide key 70 and the guide ring 80 are integrally coupled to the center rod 65. The center rod 65, the guide key 70, and the guide ring 80 are placed on the upper surface of the fall prevention plate 90 fixed to the turntable 3, and supported by the fall prevention plate 90 from below. Not only that, the center rod 65, the guide key 70, and the guide ring 80 are allowed to rotate around their axial centers, that is, around the vertical axis, together with the outer rod 60. When the outer casing 60 rotates about the axis within the lower casing holding portion 33, the lower surface of the guide ring 80 that rotates with the outer casing 60 slides against the upper surface of the fall prevention plate 90.

  Further, since the space portion 621 of the trunk portion 62 extends in the vertical direction, and the outer diameter of the trunk portion 62 is smaller than the inner dimension of the inner space portion 91 of the fall prevention plate 90, the outer casing 60 is provided with the guide key 70. The guide ring 80 and the fall prevention plate 90 can slide up and down without interference.

  In the present embodiment, the guide key 70 and the guide ring 80 function as a center rod support that is coupled to the center rod 65. Further, the fall prevention plate 90 is viewed from below so that the engagement piece 72 and the guide ring 80 projecting outward from the outer periphery of the body portion 62 of the outer casing 60 can be rotated about the axis of the outer casing 60. Functions as a supporting fall prevention body.

  As shown in FIGS. 4, 6, and 7, the outer peripheral surface of the lower end portion of the center rod 65 has a convex portion 652 projecting outward compared to the outer peripheral surface of other portions of the central rod 65. Is provided. When the center rod 65 is inserted into the shaft holes 64 and 73 from below, the convex portion 652 engages with the downward surface of the base portion 71 of the guide key 70, so that the height position of the center rod 65 with respect to the turntable 3 is increased. It is fixed.

  Due to incomplete mounting of the screw 75 for fixing the center rod 65 and the guide key 70, or due to vibration or the like during tableting, the screw 75 is loosened, so that the upper end of the center rod 65 is separated from the upper surface of the table 31. If it protrudes, since the turntable 3 rotates, a great external force is applied, which may cause abnormal wear and damage to the lower iron 6 and other members. If the convex portion 652 is formed at the lower end of the central shaft 65, the central rod 65 is more securely fixed via the central rod supports 70, 80, and the height of the central rod 65 is properly positioned. The upper end of the upper surface of the table 31 can be prevented from projecting upward. As a result, the possibility of abnormal wear and damage to the lower arm 6 and other members is reduced.

  A dust discharge hole 622 that opens to the outer peripheral surface of the barrel portion 62 and communicates with the shaft hole 64 is formed in the upper half of the barrel portion 62 of the outer casing 60 and above the space portion 621. The dust discharge hole 622 is for molding a molded product (that is, in a range necessary for filling the powder into the mortar hole 4, compressing the powder, and discharging the finished molded product onto the table 31). When the outer rod 60 moves up and down, the outer rod 60 is provided at a height position that does not enter the hole of the rod holder 33. That is, during the molding operation of the molded product, the dust discharge hole 622 is always exposed to the outside of the heel holding portion 33. 6 shows the state of the upper eyelid 5 and the lower eyelid 6 at the time of powder filling, and FIG. 7 shows the state of the upper eyelid 5 and the lower eyelid 6 at the time of powder compression. The dust discharge hole 622 is useful for discharging the dust out of the outer casing 60 when powder or other dust enters the gap between the shaft hole 64 of the outer casing 60 and the central casing 65.

  On the other hand, a concave hole 531 that accepts an upper end portion of the center rod 65 is formed in the tip portion, that is, the lower end portion 53 of the upper rod 5. When the upper punch 5 is inserted into the mortar hole 4 filled with powder, the upper end portion of the central punch 65 is fitted into the concave hole 531, and the lower end surface of the upper punch 5 passes through the annular space in the mortar hole 4. Block from above. The upper and lower ridges 5 and 6 compress the powder in the mortar hole 4 to form an annular molded product.

  Further, a lateral hole 521 that opens to the outer peripheral surface of the body portion 52 and communicates with the recessed hole 531 is formed in a portion near the lower end of the body portion 52 of the upper collar 5. The horizontal hole 521 functions to release air trapped in the recessed hole 531 to the outside of the upper flange 5 when the upper end portion of the central flange 65 enters the recessed hole 531.

  In the present embodiment, an outer rod 60 having a shaft hole 64, a lower rod 6 having a central rod 65 inserted through the shaft hole 64 of the outer rod 60, and the lower rod 6 filled with powder. A rotary plate 3 having a lower hole 4 in which the distal end portion of the outer rim 4 is inserted, and a lower heel holding portion 33 slidably holding the barrel 62 of the outer heel 60 slidably up and down; 62, a central rod support 70, 80 coupled to the central rod 65, which is disposed in a space portion 621 which is formed in 62 and communicates with the shaft hole 64 and opens outward, and the central rod support 70, 80. The parts 72 and 80 projecting outward from the outer periphery of the body portion 62 of the outer casing 60 are fixed to the rotating disk 3 so as to be supported from below so as to be rotatable around the axis of the outer casing 60. A rotary powder compression molding machine having a fall prevention body 90 was constructed.

  According to the present embodiment, the outer collar 60 can be rotated around the axis within the collar holder 33 of the rotating disk 3, so that the outer periphery of the outer casing 60 and the collar holder 33 of the rotating disk 3 can be rotated. Uneven wear does not occur between the inner periphery and the life of these members can be extended to reduce the replacement frequency.

  Further, in the conventional molding machine, when attaching the lower punch, there are three holes, namely, a pin insertion hole and a pin fitting hole provided in the lower punch and the central punch, and a pin insertion hole provided in the lower punch holding member, respectively. Had to be placed so as to overlap, and a set pin had to be inserted and screwed. Compared with such a conventional molding machine, in the present embodiment, the work of assembling the lower iron 6 and attaching it to the molding machine can be performed very easily.

  In the present embodiment, the outer rod 60 having the shaft hole 64 and the lower rod 6 provided with the center rod 65 inserted into the shaft hole 64 of the outer rod 60, and the lower rod 6 filled with powder and the lower rod A rotary powder comprising a mortar hole 4 into which the tip of the heel 6 is inserted, and a rotating disk 3 provided with a heel holding portion 33 for slidably holding the body portion 62 of the outer heel 60 up and down. In the compression molding machine, at the height position where the powder in the outer hole 60 is compressed to compress the powder filled in the mortar hole 4 to form a molded product, and does not enter the heel holding portion 33. The rotary powder compression molding machine is characterized in that a dust discharge hole 622 communicating with the shaft hole 64 and opened outward is formed.

  According to the present embodiment, dust that has entered between the outer rod 60 and the center rod 65 of the lower rod 6 can be discharged out of the lower rod 6 through the dust discharge hole 622. Therefore, the malfunction of the outer casing 60 due to the dust being caught between the outer casing 60 and the central casing 65 is avoided, and the possibility of abnormal wear and damage of the lower casing 6 and other members is reduced.

  The present invention is not limited to the embodiment described in detail above. The specific configuration of each part can be variously modified without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 3 ... Rotary disk 33 ... Lower iron holding part 4 ... Mortar hole 6 ... Lower iron 60 ... Outer iron 62 ... Body part 621 ... Space part 622 ... Dust discharge hole 65 ... Central iron 70, 80 ... Central iron support (guide key) Guide ring)
72, 80: portions projecting outward from the outer periphery of the outer shell body (engagement piece, guide ring)
90 ... Fall prevention body (fall prevention plate)

Claims (6)

An outer rod having a shaft hole, and a lower rod having a central rod inserted through the shaft hole of the outer rod,
A rotator having a mortar hole into which powder is filled and a tip portion of the lower punch is inserted, and a lower punch holding portion that slidably holds the barrel portion of the outer punch, and
A center rod support body coupled to the central rod, which is formed in a body portion of the outer rod and is disposed in a space portion that communicates with the shaft hole and opens outward.
A drop that is fixed to the rotating disk and supports a portion of the center rod support that protrudes outward from the outer periphery of the outer shell body so as to be rotatable about the axis of the outer rod. A rotary powder compression molding machine comprising a prevention body. The outer shell communicates with the shaft hole at a height position where the powder filled in the mortar hole is compressed to form a molded product so as not to enter the lower heel holding portion. The rotary powder compression molding machine according to claim 1, wherein a dust discharge hole opened outward is formed. The rotary powder compression molding machine according to claim 1 or 2, wherein the central rod is fixedly inserted through a shaft hole of the central rod support. An outer casing having a shaft hole, whose body is slidably held up and down by a lower casing holding section of the rotary powder compression molding machine,
A central rod inserted through the shaft hole of the outer rod,
It is formed in the outer casing body and is disposed in a space that communicates with the shaft hole and opens outward. The outer casing is coupled to the central casing and protrudes outward from the outer periphery of the outer casing body. A lower punch that is rotatable about an axis within a lower punch holding portion of a rotary powder compression molding machine. In the outer casing, a height position where the powder filled in the mortar hole of the rotary powder compression molding machine is compressed so as not to enter the cage holding part of the molding machine when moving up and down to form a molded product. The lower shell of claim 4, wherein a dust discharge hole communicating with the shaft hole and opened outward is formed. 6. The lower eyelid according to claim 4 or 5, wherein the center rod is inserted and fixed in a shaft hole of the center rod support.

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