Powder compression molding machine

Abstract

The damper allows for the proper recovery of molded products compressed by a rotary powder compression molding machine without causing damage. [Solution] In a rotary powder compression molding machine, the damper 16 for scraping the molded product P and guiding it to the molded product chute 19 is configured to include a base body 171 that extends from the base end closer to the molded product chute 19 so that the tip end moves away from the molded product chute 19 and intersects with the rotational trajectory of the die hole 4 of the table 31, and a scooping body 172 that is supported by the base body 17 and has an inclined surface 1721 that is inclined with respect to the upper surface of the table 31 and is inserted from below into the molded product P that is pushed out from the die hole 4 of the table 31 by the lower punch.

Description

Technical Field

[0001] The present invention relates to a rotary powder compression molding machine that compresses powder to form tablets, foods, and the like.

Background Art

[0002] A large number of mortise holes are provided on the outer periphery of the table of a rotating disk, and upper and lower punches are slidably held above and below each mortise hole, respectively. The table and the punches are both rotated horizontally, and when the mortise hole passes directly below the feed chute, powder is filled into the mortise hole. Then, when the pair of upper and lower punches passes between the upper and lower rolls, the powder in the mortise hole is compression molded (or tabletted). A rotary powder compression molding machine is known.

[0003] The shape of the molded product conforms to the mold, that is, the shape of the tip of the upper and lower punches and the inner periphery of the mortar. By using a dedicated mold, it is also possible to produce a spherical molded product (see, for example, Patent Document 1 below). Examples of spherical molded products include spherical tablets of pharmaceuticals, toiletries such as insect repellents and deodorants, and candies and ramune confectionery.

[0004] In a rotary powder compression molding machine, in order to take out the compression molded product, the upper punch is lifted and withdrawn outside the mortise hole and retracted from the table, and the lower punch is raised to push up the molded product from the mortise hole. Then, the molded product is scraped off by a damper (or scraper) installed at a predetermined position and guided to a molded product chute.

[0005] However, in the case of a spherical molded product, the recess (cup) on the tip surface of the tip of the lower punch may be deep (if the tip of the lower punch protrudes beyond the upper surface of the table, the tip may collide with the damper. Therefore, it is difficult to completely expose the entire molded product on the table), and if the molded product is simply scraped off by the damper, there is a possibility that the molded product may be chipped, cracked, or disintegrated.

[0006] One possible solution is to have a double-layered lower punch, consisting of a hollow outer punch with a axial hole and a central punch (inner punch) inserted through that axial hole (see, for example, Non-Patent Document 1 and Patent Document 2 below), which moves independently of the outer punch, to push the molded product out of the die hole and expose it on the table. However, this would make the structure of the lower punch itself, as well as the structure of the guide rails that move the outer and central punches up and down individually, extremely complex. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2012-148321 [Patent Document 2] Japanese Patent Publication No. 2017-159304 [Non-patent literature]

[0008] [Non-Patent Document 1] Powder Technology Society of Japan, Formulation and Particle Design Division (ed.), "Compression Molding Technology of Powders," 1st edition, Nikkan Kogyo Shimbun, June 30, 1998, pp. 303-304. [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention aims to enable the proper recovery of molded products by a damper in a rotary powder compression molding machine without causing damage to the compressed products. [Means for solving the problem]

[0010] The present invention provides a rotary powder compression molding machine in which a die hole is provided that penetrates the table of a rotary disk, and an upper punch and a lower punch are slidably held above and below each die hole, and when the rotary disk is rotated horizontally and the die hole passes under the feed shoe, powder is filled into the die hole from the feed shoe, and when the pair of upper and lower punches pass between the upper roll and the lower roll, the powder filled in the die hole is compressed and molded to produce a molded product. The damper for scraping the molded product and guiding it to the molded product chute comprises a base body that extends from the base end closer to the molded product chute so that the tip end moves away from the molded product chute and intersects with the rotational trajectory of the die hole on the table, and a scooping body supported by the base body and having an inclined surface that is inclined with respect to the upper surface of the table, which is inserted from below into the molded product as it is pushed out of the die hole on the table by the lower punch. Here, "powder" refers to an aggregate of minute particles, and is a concept that encompasses both aggregates of granular materials such as granules and aggregates of powders smaller than granules. A mixture of multiple types of powders is also considered a powder.

[0011] The damper of the powder compression molding machine according to the present invention scoops up and removes the molded product extruded from the die hole of the table from below. This greatly reduces the possibility of damage to the molded product. Such a configuration is particularly suitable for molding and removing molded products that have a roughly spherical shape.

[0012] In addition, if the portion of the damper base located on the tip side of the scooping body contacts the molded product while it is being pushed out of the die hole of the table by the lower punch and is not yet completely exposed above the top surface of the table, and then the scooping body contacts the molded product, then the molded product that is partially (especially more than half) exposed on the table from the die hole will be slightly displaced by the tip portion of the base, separating it from the die hole and the lower punch, before being scooped up by the scooping body. This can mitigate the instantaneous impact applied to the molded product and eliminate concerns about damage to the molded product.

[0013] If the side edge of the part of the damper base that is closer to the tip than the scooping body is non-linear and bulges out towards the die hole from which the molded product is being pushed out by the lower punch, then even if the molded product flowing toward the damper hits the tip of the damper base, it can be deflected. In other words, the increase in force applied from the damper base to the molded product becomes gradual.

[0014] If the intersection angle of the damper base with respect to the rotational trajectory of the die hole in the table can be variably adjusted, the magnitude of the force applied to the molded product immediately after it contacts the tip of the damper base can be finely adjusted. Furthermore, it is possible to avoid a large shear force acting on a molded product partially exposed on the table, which could cut the product between the die hole in the table and the tip of the damper base. This is effective in preventing damage to the finished molded product.

[0015] If the relative position of the scooping body of the damper with respect to the base can be variably adjusted, the timing of scooping up the molded product flowing toward the damper can be finely adjusted. This is also effective in preventing damage to the molded product. It also contributes to properly guiding the molded product outside the rotational trajectory of the die and lower punch so that the molded product removed from the die hole does not collide with the tip of the lower punch moving upward. [Effects of the Invention]

[0016] According to the present invention, in a rotary powder compression molding machine, the compressed molded product can be properly recovered by a damper without causing damage. [Brief explanation of the drawing]

[0017] [Figure 1] A side cross-sectional view of a rotary powder compression molding machine according to one embodiment of the present invention. [Figure 2] A plan view showing the table and damper of the rotating disc of the molding machine according to the same embodiment. [Figure 3]An exploded view showing the flow of the manufacturing process of the molded product by the molding machine of the same embodiment and the vertical movement of the pestle following the rotation of the turntable. [Figure 4] A plan view showing an enlarged view of the damper and its periphery on the table of the turntable of the molding machine of the same embodiment. [Figure 5] A side view of the damper of the molding machine of the same embodiment. [Figure 6] A perspective view of the damper of the molding machine of the same embodiment. [Figure 7] An exploded perspective view of the damper of the molding machine of the same embodiment. <00,00091>An end view showing the pattern of molding of the spherical molded product in the molding machine of the same embodiment. [Figure 9] An end view showing the pattern of lifting and scraping of the spherical molded product in the molding machine of the same embodiment. [Figure 10] An end view showing the pattern of scraping (particularly, scooping up) of the spherical molded product in the molding machine of the same embodiment.

Mode for Carrying Out the Invention

[0018] 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") A used for manufacturing a molded product P in the present embodiment will be described. As shown in FIG. 1, a vertical shaft 2 serving as a rotating shaft is established inside a frame 1 of the present molding machine A, and a turntable 3 is attached to the upper part of the vertical shaft 2.

[0019] The rotating disc 3 rotates horizontally, i.e., on its own axis, around the axis of the vertical shaft 2. The rotating disc 3 consists of a table (mortar disc) 31, an upper pestle holder 32, and a lower pestle holder 33. As shown in Figures 2 and 4, the table 31 is roughly disc-shaped, and multiple mortar holes 4 are provided on its outer circumference at predetermined intervals along the direction of rotation. Here, the rotating disc 3, including the table 31 and the pestle holder 32, as well as the pestles 5 and 6, rotate counterclockwise in a plan view. The mortar holes 4 penetrate the table 31 vertically. The table 31 may be divided into multiple plates. Alternatively, instead of directly drilling and forming the mortar holes 4 in the table 31 itself, multiple mortar members that are separate from the table 31 and detachable from the table 31 may be attached to the table 31, and each of these mortar members may have mortar holes that penetrate vertically.

[0020] As shown in Figures 1 and 3, an upper pestle 5 and a lower pestle 6 are positioned above and below each die hole 4. The upper pestle 5 and the lower pestle 6 are held by the upper pestle holder 32 and the lower pestle holder 33 so that they can slide individually in the vertical direction relative to the die hole 4. The tip 53 of the upper pestle 5 moves in and out of the die hole 4. The tip 63 of the lower pestle 6 is always inserted into the die hole 4. The upper pestle 5 and the lower pestle 6 rotate horizontally, i.e., revolve around the axis of the vertical shaft 2 together with the turntable 3 and the die holes 4.

[0021] A worm wheel 7 is attached to the lower end 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 driven by a motor 8. The driving force output by the motor 8 is transmitted to the gear shaft 9 by a belt 11, and rotates the turntable 3 and the pestles 5 and 6, which are connected to the vertical shaft 2 via the worm gear 10 and worm wheel 7.

[0022] The powder material for the compression molded product P is fed from a powder supply device (not shown) into a hopper (or buffer tank) 20, and then supplied from the hopper 20 to a filling device, the feed shoe X. The feed shoe X is located on the outer circumference of the rotating table 31, specifically directly above the rotational trajectory of the die cavity 4. As the table 31 rotates together with the turntable 3, the die cavity 4 is displaced relative to the feed shoe X. The feed shoe X fills the die cavity 4, which passes directly below it, with powder. The feed shoe X implemented in the molding machine A is mainly an agitated feed shoe that incorporates rotating agitating blades to agitate the powder while pouring it into the die cavity 4, but an open feed shoe without built-in agitating blades may also be used.

[0023] As shown in Figures 2 and 3, on the orbital path of the pestles 5 and 6 around the axis of the vertical shaft 2, there are upper pre-pressure rolls 12 and 13, and upper main pressure rolls 14 and 15, which are positioned above and below the pestles 5 and 6, flanking them. The upper pre-pressure rolls 12 and 13, and the upper main pressure rolls 14 and 15, bias the upper and lower pestles 5 and 6 toward each other in order to compress the powder filled in the die cavity 4 from above and below with the tip surfaces of the pestle tips 53 and 63.

[0024] The upper pestle 5 and lower pestle 6 each have heads 51 and 61 that are pressed by the rolls 12, 13, 14, and 15, and bodies 52 and 62 that are smaller in diameter than the heads 51 and 61. The upper pestle holder 32 of the rotating disc 3 holds the body 52 of the upper pestle 5 so that it can slide up and down, and the lower pestle holder 33 holds the body 62 of the lower pestle 6 so that it can slide up and down. The tip portions 53 and 63 of the bodies 52 and 62 are even thinner than the rest of the body and have a diameter approximately equal to the inner diameter of the die hole 4, so that they can be inserted into the die hole 4. As the pestles 5 and 6 revolve, the rolls 12, 13, 14, and 15 approach the heads 51 and 61 of the pestles 5 and 6 and make contact with them by riding on top of them. Furthermore, rolls 12, 13, 14, and 15 push the upper pestle 5 downwards and the lower pestle 6 upwards. While rolls 12, 13, 14, and 15 are in contact with the flat surfaces on the pestles 5 and 6, the pestles 5 and 6 continuously apply constant pressure to the powder inside the die cavity 4.

[0025] Downstream from the pressurizing position by the main upper roll 14 and main lower roll 15, along the rotational direction of the turntable 3 and punches 5 and 6, there is a removal position for removing the finished molded product P. As shown in Figures 2 to 4, a damper (or scraper) 16 is fixedly installed at this removal position. The damper 16 will be described in detail later.

[0026] The vertical movement of the upper pestle 5 and lower pestle 6 is caused by cam rails R1, R2, R3, R4, R5, and R6. Rails R1, R2, R3, R4, R5, and R6 extend along the rotational direction of the turntable 3 and the pestles 5 and 6, and engage with the heads 51 and 61 of the pestles 5 and 6, guiding and moving the pestles 5 and 6 up and down.

[0027] As shown in Figure 3, on the rotational trajectory of the head 51 of the upper punch 5, there is an upward rail (upward cam) R1 that lifts the upper punch 5 upstream of the damper 17 and pulls its punch tip 53 out of the die hole 4, and a downward rail (downward cam) R5 that pushes down the upper punch 5 upstream of the rolls 12 and 14 and inserts its punch tip 53 into the die hole 4 in preparation for subsequent powder compression.

[0028] On the rotational trajectory of the head 61 of the lower punch 6, there is a push-up rail R4 that lifts the lower punch 6 upstream of the damper 17 to bring its punch tip 63 to approximately the same height as the top surface of the table 31, a lowering device R2 that pulls down the lower punch 6 upstream of or near the feed shoe X to adjust the volume of the die cavity 4 above the punch tip 63 to a size corresponding to the amount of powder that will be the constituent material of the molded product P, and a volume rail R3 that slightly lifts the lower punch 6 downstream of the feed shoe X to fine-tune the amount of powder that will be filled into the die cavity 4. In the latter half of the volume rail R3, the lower punch 6 is slightly pulled down to prevent the powder in the die cavity 4 from spilling out due to centripetal force or the like after the amount has been adjusted.

[0029] To outline an example of the manufacturing process for molded product P, as shown in Figure 3, first the lower punch 6 descends, and lubricant is sprayed from the spraying device Y onto the inner circumferential surface of the die cavity 4 into which the punch tip 63 of the lower punch 6 is inserted, the upper end surface (cup) of the punch tip 63 of the lower punch 6, and the lower end surface (cup) of the punch tip 53 of the upper punch 5. Next, powder is filled into the die cavity 4 into which the punch tip 63 of the lower punch 6 is inserted from the feed shoe X, and the lower punch 6 rises until the amount of powder in the die cavity 4 reaches the required level, scraping off any powder that overflows from the die cavity 4.

[0030] Subsequently, the upper punch 5 descends, and the pre-pressing upper roll 12 and pre-pressing lower roll 13 press against the head 51 of the upper punch 5 and the head 61 of the lower punch 6, performing pre-compression by compressing the powder in the die cavity 4 with the punch tips 53 and 63 of the punches 5 and 6. Next, the main pressing upper roll 14 and main pressing lower roll 15 press against the head 51 of the upper punch 5 and the head 61 of the lower punch 6, performing main compression by compressing the powder in the die cavity 4 with the punch tips 53 and 63 of the punches 5 and 6.

[0031] Downstream of the main pressure rolls 14 and 15 along the rotation direction of the turntable 3, the tip 63 of the lower punch 6 rises until it is near the upper end of the die cavity 4, that is, at approximately the same height as the upper surface of the table 31, pushing the molded product P inside the die cavity 4 onto the table 31. The molded product P then comes into contact with the damper 16 at the product removal position due to the rotation of the turntable 3, is scraped off, and is guided along the damper 16 towards the molded product chute 19. Finally, the molded product P falls from the chute 19 and is discharged outside the molding machine A.

[0032] Hereafter, additional information will be provided regarding the damper 16 installed at the product removal position of the molding machine A in this embodiment. As shown in Figures 4 to 7, the damper 16 consists of a damper body 17, which includes a base 171 and a scooping body 172, supported by a damper support 18, and the damper support 18 is fixed to a stationary member of the molding machine A other than the rotating disc 3.

[0033] The base 171 of the damper 16 is a rod-shaped member that extends such that its base end (lower part in Figures 2 and 4) faces the molded product chute 19 and its tip end (upper part in Figures 2 and 4) moves away from the molded product chute 19. The base 171 intersects with the rotational trajectory T of the die hole 4 provided in the table 31. The scooping body 172 is provided midway between the tip end portion 1711 and the base end portion 1712 of the base 171.

[0034] At the tip portion 1711 of the base body 171, the side edge (left edge in Figure 4) on the side where the die hole 4 and molded product P approach as the table 31 rotates is slightly bulging and non-linear in a plan view, approaching the die hole 4. As shown in Figure 9, this side edge of the tip portion 1711 facing the molded product P stands almost perpendicular to the upper surface of the table 31, that is, it is an end face that stands almost parallel to the axial direction of the die hole 4 (the vertical direction in which the punches 5 and 6 move).

[0035] In the plan view shown in Figure 4, the side edge of the tip portion 1711 of the base body 171 has a curved surface that bulges outward (to the left in Figure 4) along the radial direction (direction perpendicular to the rotation direction) when viewed from the center of horizontal rotation of the table 31 and the die hole 4, at the point where it first makes contact with the molded product P being pushed upward from the die hole 4. The side edge of the base body 171 on the tip side (the side further from the molded product chute 19) of this point is receded inward (to the right in Figure 4) along the radial direction, and does not come into contact with the molded product P being pushed out from the die hole 4. In addition, the side edge of the base body 171 on the base end side (the side closer to the molded product chute 19) of this point is also receded slightly inward along the radial direction, and is approximately parallel to or close to the rotational trajectory T of the die hole 4. This shape mitigates the impact applied to the molded product P when it comes into contact with the base 171 of the damper 16, thereby reducing the magnitude of the force acting instantaneously on the molded product P.

[0036] In this embodiment, the aim is to manufacture a roughly spherical molded product P using a molding machine A. As shown in Figure 8, the tip surface of the upper punch 5's punch tip 53 is roughly hemispherical with an opening facing downwards, and the tip surface of the lower punch 6's punch tip 63 is roughly hemispherical with an opening facing upwards. Then, the powder filled in the die cavity 4 is surrounded and compressed between the tip surfaces of both punches 5 and 6. However, during compression molding, the punch tip 53 of the upper punch 5 and the punch tip 63 of the lower punch 6 must not collide. Therefore, a side band PS corresponding to the gap between the tip of the upper punch 5's punch tip 53 and the tip of the lower punch 6's punch tip 63 is formed between the upper and lower parts of the molded product P formed in the die cavity 4.

[0037] As shown in Figure 9, even if the lower punch 6 moves upward to push the molded product P out of the die hole 4 at the removal position of the molded product P, the entire molded product P is not exposed above the upper surface of the table 31. The lower part of the molded product P is still contained in the die hole 4 and is below the upper surface of the table 31. In this state, the side end surface of the tip portion 1711 of the base 171 of the damper 16 comes into contact with the side band portion PS of the molded product P as it is transported by the rotation of the table 31. As a result, the molded product P is pushed by the bulge portion 1711 of the base 171 and attempts to be displaced outward along the radial direction of the table 31 from the die hole 4 (to the left in Figure 4, to the right in Figure 9). At the same time, the molded product P is lifted up as if being pulled away from the punch tip 63 of the lower punch 6.

[0038] The scooping body 172 of the damper 16 scoops up the molded product P that has been levitated in this manner. The scooping body 172 has an inclined surface 1721 that is inclined nonparallel to the upper surface of the table 31. As shown in Figures 4, 6, and 7, the side edge of the inclined surface 1721 of the scooping body 172, that is, the outer edge along the radial direction of the table 31 (the left edge in Figure 4), gradually protrudes outward from the tip side (upper in Figure 4) to the base side (lower in Figure 4) of the base body 171 of the damper 16. In other words, in a plan view, the inclined surface 1721 gradually expands outward from the tip side to the base side of the base body 171. Also, as shown in Figures 5 to 7, the inclined surface 1721 gradually becomes higher from the tip side (left in Figure 5) to the base side (right in Figure 5) of the base body 171. Furthermore, as shown in Figures 6, 7, and 10, the slope 1721 gradually increases in height from the outer side of the table 31 (left side in Figure 4, right side in Figure 10) towards the inner side (right side in Figure 4, left side in Figure 10) as it approaches the base 172.

[0039] At the removal position of the molded product P, the molded product P, which has been lifted by contact with the tip portion 1711 of the base 171 of the damper 16, moves toward the scooping body 172 as shown in Figure 4. Then, as shown in Figure 10, it rides onto the inclined surface 1721 of the scooping body 172. As a result, as shown in Figure 4, the molded product P is pushed outward along the radial direction of the table 31 by the inclined surface 1721 of the scooping body 172, and moves away from the trajectory of the rotation T of the die hole 4 and rolls on the table 31.

[0040] However, the molded product P then comes into contact again with the side edge of the portion 1712 of the base body 171 of the damper 16 that is closer to the base end than the scooping body 172, and proceeds along that base end portion 1712 towards the molded product chute 19, falls into the molded product chute 19, and is finally discharged to the outside of the molding machine A.

[0041] As shown by the arrow W in Figure 4, the damper body 17, i.e., the base 171 and the scooping body 172 supported thereby, can adjust the angle of intersection with respect to the rotational trajectory T of the die hole 4. As shown in Figures 6 and 7, the base end of the damper body 171 has multiple through holes 1715 and 1717 that penetrate it vertically. In addition, the damper support 181 that supports the base end of the damper body 171 from below has multiple female screw holes 181 formed therein, corresponding to each of the through holes 1715 and 1717. A stepped bolt 1716 is inserted through one of the through holes 1715 from above, and the male thread of its shaft is screwed into one of the female screw holes 181. The stepped bolt 1716 serves as the axis of rotation for swinging the damper body 17 horizontally relative to the damper support 18. A bolt 1718 with a washer is inserted through the other through hole 1717 from above, and the male thread on its shaft is screwed into the other female threaded hole 181 and tightened. The bolt 1718 serves as a fastener that immovably fixes the damper body 17 to the damper support 18. The orientation of the damper body 17 along the arrow W in Figure 4 is slightly adjusted according to the diameter of the molded product P, that is, the inner diameter of the die hole 4 and the outer diameter of the punch tips 53 and 63 of the punches 5 and 6.

[0042] Furthermore, as indicated by arrow D in Figure 4, the scooping body 172 in the damper body 17 can be adjusted relative to the base body 171 along the direction in which the base body 171 extends. As shown in Figures 6 and 7, an elongated hole 1713 is drilled through the middle portion of the base body 171 from top to bottom. In addition, multiple female screw holes 1722 are formed in the portion of the scooping body 172 other than the inclined surface 1712, and in the portion that abuts the middle portion of the base body 171 from below. Multiple bolts 1714 are inserted through the elongated hole 1713 from above, and the male threads of their shafts are screwed into the female screw holes 1722 to tighten them. The scooping body 172 can be displaced relative to the base body 171 along the direction in which the elongated hole 1713 expands. The multiple bolts 1714 then serve as fasteners to permanently fix the scooping body 172 to the base body 171. The front-to-back position of the scooping body 172 along arrow D in Figure 4 is finely adjusted according to the diameter of the molded product P, i.e., the inner diameter of the die hole 4 and the outer diameters of the pestle tips 53 and 63 of the pestles 5 and 6.

[0043] In this embodiment, a rotary powder compression molding machine A is provided with a die hole 4 that penetrates the table 31 of the rotary disk 3, and an upper punch 5 and a lower punch 6 are slidably held above and below each die hole 4, respectively, and when the rotary disk 3 is rotated horizontally and the die hole 4 passes under the feed shoe X, powder is filled into the die hole 4 from the feed shoe X, and when the pair of upper punches 5 and lower punches 6 pass between the upper rolls 12, 14 and the lower rolls 13, 15, the powder filled into the die hole 4 is compressed and molded to produce a molded product P, wherein the molded product A powder compression molding machine A is configured with a damper 16 for scraping off the molded product P and guiding it to the molded product chute 19, which has a base body 171 that extends from the base end closer to the molded product chute 19 so that the tip end moves away from the molded product chute 19 and intersects with the rotational trajectory T of the die hole 4 of the table 31, and a scooping body 172 that is supported by the base body 171 and has an inclined surface 1712 that is inclined with respect to the upper surface of the table 31, and which is inserted from below into the molded product P that is pushed out from the die hole 4 of the table 31 by the lower punch 6.

[0044] In this embodiment, at the removal position of the molded product P in the molding machine A, the molded product P being pushed out from the die hole 4 of the table 31 is not scraped off by colliding with the base 171 of the damper 16, but is instead scooped up from below by the scooping body 172. According to this embodiment, it is possible to suppress the instantaneous application of a large force to the molded product P and greatly reduce the possibility of damage to the molded product P. Such a configuration is particularly suitable for manufacturing a molded product P having a substantially spherical shape using the molding machine A.

[0045] In this embodiment, the portion 1711 of the base 171 of the damper 16 that is located towards the tip of the scooping body 172 contacts the molded product P while it is being pushed out from the die hole 4 of the table 31 by the lower punch 6 and is not yet completely exposed above the upper surface of the table 31, after which the scooping body 172 contacts the molded product P. As a result, the molded product P that is exposed to a certain extent (especially more than half) on the table 31 from the die hole 4 is brought into contact with the tip portion 1711 of the base 1711, slightly displaced to separate it from the die hole 4 and the lower punch 6, and then scooped up by the scooping body 172. Consequently, the impact instantaneously applied to the molded product P can be mitigated, eliminating concerns about damage to the molded product P.

[0046] If the side edge of the portion 1711 of the base 171 of the damper 16 that is closer to the tip of the scooping body 172 is non-linear and bulges out towards the die hole 4 through which the molded product P is being pushed out by the lower punch 6, then even if the molded product P flowing toward the damper 16 hits the tip portion 1711 of the base 171 of the damper 16, the molded product P can be deflected. In other words, the increase in force applied from the base 171 of the damper 16 to the molded product P becomes gradual.

[0047] If the intersection angle of the base 171 of the damper 16 with respect to the rotational trajectory T of the die hole 4 of the table 31 can be variably adjusted, the magnitude of the force applied to the molded product P immediately after it hits the tip portion 1711 of the base 171 of the damper 16 can be finely adjusted. This is effective in gently lifting the compression-molded product P away from the die hole 4 and the punch tip 63 of the lower punch 6, thereby preventing damage to the molded product P. Furthermore, it is possible to avoid a large shear force acting on the molded product P that is partially exposed on the table 31, which could cut the product P between the die hole 4 of the table 31 and the tip portion 1711 of the base 171 of the damper 16.

[0048] If the relative position of the scooping body 172 of the damper 16 with respect to the base 171 can be variably adjusted, the timing of scooping up the molded product P flowing toward the damper 16 can be finely adjusted. This is also effective in preventing damage to the molded product P. It also contributes to properly guiding the molded product P outside the rotational trajectory T of the die hole 4 and the lower punch 6 so that the molded product P removed from the die hole 4 does not collide with the tip of the upper punch 6.

[0049] It should be noted that the present invention is not limited to the embodiments described in detail above. For example, the shape of the molded product P formed by the molding machine A is not limited to a substantially spherical shape.

[0050] Furthermore, the specific configuration of each part can be modified in various ways without departing from the spirit of the present invention. [Explanation of Symbols]

[0051] A... Rotary powder compression molding machine 3… Rotating disc 31... Table 32, 33...Pinch holding part 4…Mortar hole 5, 6...Pestle 16...Dump 17... Damper body 171...Base 1711... The part located towards the tip of the scooped-up body. 172... Scooped-up body 1721... Slope 18... Damper support 19…Molded product chute P…molded product PS... Side band of molded product X...Filling device (feed shoe) Y... Lubricant spraying device T... Trajectory of rotation of the mortar hole

Claims

1. A rotary powder compression molding machine is provided with die holes that penetrate the table of a rotating disc, and an upper punch and a lower punch are slidably held above and below each die hole, and when the rotating disc is rotated horizontally and the die hole passes under the feed shoe, powder is filled into the die hole from the feed shoe, and when the pair of upper and lower punches pass between the upper roll and the lower roll, the powder filled in the die hole is compressed and molded to produce a molded product. A damper for scraping off the molded product and guiding it to the product chute is provided. A base body that extends from the base end closer to the molded product chute so that the tip end moves away from the molded product chute and intersects with the rotational trajectory of the die hole of the table, A scooping body is supported by the base and has an inclined surface relative to the upper surface of the table, and is inserted from below into the molded product that is pushed out from the die hole of the table by the lower punch. A powder compression molding machine equipped with [a specific feature / feature].

2. The powder compression molding machine according to claim 1, wherein the molded product has a substantially spherical shape.

3. The powder compression molding machine according to claim 1, wherein the portion of the damper base that is closer to the tip than the scooping body contacts the molded product while it is being pushed out from the die hole of the table by the lower punch and is not yet fully exposed above the upper surface of the table, and thereafter the scooping body contacts the molded product.

4. The powder compression molding machine according to claim 3, wherein the side edge of the portion of the damper base that is closer to the tip than the scooping body is bulging out in a non-linear shape so as to approach the die cavity from which the molded product is being extruded by the lower punch.

5. The powder compression molding machine according to claim 1, 2, 3, or 4, wherein the intersection angle of the damper base with respect to the rotational trajectory of the die hole in the table can be variably adjusted.

6. The powder compression molding machine according to claim 1, 2, 3, or 4, wherein the relative position of the damper's scooping body with respect to the base body can be variably adjusted.

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