WO2004028791A1

WO2004028791A1 - Rotary-type powder-compressing and -forming apparatus

Info

Publication number: WO2004028791A1
Application number: PCT/JP2003/012185
Authority: WO
Inventors: Keiji Shimada; Yoshitsugu Oneda
Original assignee: Kikusui Seisakusho Ltd.
Priority date: 2002-09-27
Filing date: 2003-09-24
Publication date: 2004-04-08
Also published as: JP2004114135A; AU2003266589A1; JP3756863B2

Abstract

With a rotary-type powder-compressing and -forming apparatus, when the production quantity of formed products is reduced, labor is saved both in removing unnecessary upper hammers, lower hammers, and mortars, and in installing no-hole mortars. In the apparatus, a rotary table is provided in a frame so as to be horizontally rotatable through a vertical shaft. Mortars are arranged at predetermined intervals on the rotary table, and, above and below each mortar, an upper hammer and lower hammer are held so as to be slidable in a vertical direction. When the upper hammer and lower hammer are passed between an upper roller and lower roller with the tips of the hammers inserted in the mortar, powder filled in the mortar is compressed and formed. The apparatus has fixed position-holding means for holding the tip of a lower hammer, corresponding to an upper hammer whose tip is limited to be inserted into a mortar, so that the lower hammer tip end is substantially in the same plane as the upper face of the rotary table.

Description

Specification

Technical field of rotary powder compression molding machine

TECHNICAL FIELD The present invention relates to a rotary powder compression molding machine for compressing powder to form tablets, foods, electronic components, and the like. Background art

Conventionally, in this type of powder compression molding machine, a plurality of dies to be filled with powder to be compressed are arranged in a circumferential direction at a predetermined pitch, and an upper punch and an upper punch which are slidably held up and down on each of the dies. By passing the lower punch through the upper opening and the lower roll, the tips of the upper punch and the lower punch are simultaneously operated so as to approach each other, and the powder filled in the mill is removed. Usually, for example, in the case of producing tablets, tablets of the same type are produced by the same rotary powder compression molding machine (for example, see Patent Document 1).

Patent Document 1

Japanese Patent Application Laid-Open No. 2000-1 — 3 5 3 5 9 7

In recent years, depending on the type of tablets to be manufactured, thinning operation has been performed to reduce the production volume due to the market shrinking in recent years. In such a thinning operation, unlike the case of the normal operation, the number of the upper punches, the lower punches, and the dies that perform the compression operation is reduced. Specifically, for example, if the production volume is 1 When setting to Z3, remove the unnecessary upper and lower punches to reduce the number to 1 Z3, and remove the dies corresponding to the removed upper and lower punches. At the place where the mortar was attached, a non-porous mortar with the upper surface flush with the upper surface of the turntable is attached. Non-perforated mortars are used to prevent powder from scattering into the machine through the mortar if the normal mortar is left attached.

However, reducing production in this way would result in unnecessary removal of upper punches, lower punches and dies, and installation of non-porous dies. is there. For this reason, it takes a long time to start production, and when removing the mortar, it is necessary to clean the powder remaining around the mortar. If the upper and lower punches to be removed and the non-perforated mortar to be removed are incorrectly positioned, each punch may cause a failure in the non-perforated mortar without a mortar. . Disclosure of the invention

An object of the present invention is to solve such a problem.

That is, in the rotary powder compression molding machine of the present invention, a rotating disk is horizontally and rotatably disposed in a frame via a vertical shaft, and a plurality of dies are mounted on the rotating disk at a predetermined pitch. The upper punch and the lower punch are held above and below each mill so that they can slide up and down, and the upper punch and the lower punch with the tip of the punch inserted into the mill are connected to the upper roll and the lower roll. Filling in the mortar by passing through In a rotary-type powder compression molding machine that compresses molded powder, the lower punch corresponding to the upper punch that restricts the insertion of the punch tip into the die, and the tip of the lower punch is almost flush with the upper surface of the turntable. In such a configuration, the upper punch is limited in that the tip of the punch is inserted into the die. Therefore, even when the tip of the lower punch corresponding to the upper punch is substantially flush with the upper surface of the turntable, the tip of the upper punch does not collide with the tip of the lower punch. Therefore, there is no need to remove the mortar or remove the lower punch.

Also, since the tip of the lower punch is almost flush with the upper surface of the turntable, the powder to be compressed does not enter the die. Furthermore, since it is not necessary to remove the mortar, there is no need to clean the powder accompanying the removal of the mortar.

Therefore, when adjusting the production volume, the upper punch, the lower punch, and the mortar are not removed from the turntable at the upper and lower punches where the compression operation is stopped, and the production volume is reduced. It becomes possible to do. In addition, since such removal work is not required, it is possible to shorten the time required for the change work when switching the production amount. In addition, since the tip of the upper punch is restricted from being inserted into the die, it is possible to prevent the upper punch from contacting the lower punch and causing a failure.

Specifically, the fixed position holding means is rotatably attached to the lower punch cylinder attached to the turntable and the lower end of the lower punch. It is preferable to use a lower punch switching member which engages with the lower punch cylinder to make the punch tip of the lower punch substantially flush with the upper surface of the turntable.

To make it easier to switch between the normal use of the lower punch and the state where the tip of the lower punch is kept flush with the upper surface of the turntable, the lower punch cylinder should be placed near the lower end of the inner surface. It is desirable that the lower punch switching member has an inner groove that engages with the punch switching member, and that the lower punch switching member has a flange at its upper end that engages with the inner groove of the lower punch cylinder. New

In order to reliably switch between normal operation and thinning operation, the lower punch is provided with a rod body that is mounted inside the lower punch switching member at the mounting position and whose tip can protrude and retract. It is preferable that the member has a through hole into which the tip of a rod protruding when the member is not engaged with the inner groove of the lower punch cylinder is inserted. By inserting the rod into the through hole by protruding and retracting the tip of the rod, the lower punch switching member is reliably prevented from engaging with the lower punch cylinder during normal operation. It becomes possible to do.

In order to limit the penetration of the tip of the upper punch into the die, the upper punch has a punch main body and a punch having a punch tip that is detachably attached to the punch main body and inserted into the die. It is preferable that the tip of the lower punch be detached when the lower punch is held flush with the upper surface of the turntable.

In order to produce a large number of varieties in small quantities, it is preferable to attach a plurality of dies having different inner diameters and a plurality of upper punches and lower punches having punches corresponding to the inner diameter of the mortar. Such a structure If this is the case, the mortar to be used is set according to the variety, the upper punch and the lower punch are installed in accordance with the mortar, and the mortar to be used is easily switched, so that the variety can be easily changed. Small-scale production can be realized. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is an exploded view for explaining the operation of the upper punch and the lower punch of the embodiment.

FIG. 3 is an exploded perspective view of the upper punch of the embodiment. FIG. 4 is an exploded perspective view of the lower punch of the embodiment. FIG. 5 is an enlarged sectional view of a main part when normal operation of the embodiment is performed.

FIG. 6 is a cross-sectional view taken along the line BB in FIG.

FIG. 7 is an enlarged sectional view of a main part showing a preparatory work for a thinning operation according to the embodiment.

FIG. 8 is an enlarged cross-sectional view of a main part when a thinning operation is performed in the same embodiment.

FIG. 9 is a sectional view taken along the line AA in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. You.

FIG. 1 shows the overall configuration of a rotary powder compression molding machine according to the present invention. In this rotary powder compression molding machine, a rotary disk 3 is disposed in a frame 1 via a vertical shaft 2 so as to be horizontally rotatable, and a plurality of dies 4 are mounted on the rotary disk 3 at predetermined pitches. The upper punch 5 and the lower punch 6 are held above and below each die 4 so as to be slidable up and down. When the tip of each of the upper punch 5 and the lower punch 6 is inserted into the mill 4 and is passed between the upper roll 71 and the lower roll 72, the powder filled in the mill 4 is removed. The upper roll 71 and the lower opening 72 are arranged at the upper and lower positions of the turntable 3 around the vertical shaft 2 so that they can be compressed. Note that the description of the specific configuration such as the powder supply mechanism and the mechanism for removing the compressed molded article can be made by applying widely known configurations in the relevant field. I omit it in the form.

Around the turntable 3, there are provided an upper punch guide rail mechanism 8 for raising and lowering the upper punch 5 and a lower punch guide rail mechanism 9 for raising and lowering the lower punch (see FIG. The upper punch guide rail mechanism 8 has an upper punch lowering cam 8 1 for inserting the tip of the upper punch 5 into the dies 4, and an upper punch when removing the molded product from the dies 4. Includes an upper punch rising cam 82 for extracting the tip of the punch 5 from the die 4. In addition, the lower punch guide rail mechanism 9 has a lowering device 91 for lowering the lower punch 6 when filling the powder into the die 4, and a lower punch for adjusting the amount of the filled powder. Amount to raise to the specified position Rail 9 2 Etc. are included. The lowering device 91 has an opening 91a on the upper surface through which the lower punch 6 passes, and the edges of the opening 91a protrude in a direction approaching each other. Therefore, the cam portion 63b of the switching cam 63 described later has a guide portion 9lb that comes into sliding contact during normal operation.

More specifically, an upright shaft 2 supported by bearings 21 is provided substantially at the center of the frame 1, and a lower end of the upright shaft 2 is provided. A worm wheel 22 is fixed in the vicinity, and the rotational driving force of the motor 25 is transmitted to the worm wheel 22 via the worm 23 and the belt 24. It has become. In the vicinity of the upper end of the vertical shaft 2, a turntable 3 divided into three functional parts is fixed.

The turntable 3 is provided on a lower portion thereof and holds a lower punch 6 slidably up and down, and a turntable 3 is provided on an upper portion and holds an upper punch 5 slidably. It comprises a punch holding portion 32 and a die portion 33 provided between the upper punch holding portion 32 and the lower punch holding portion 31 to which the die 4 is removably fitted. The upper punch holder 32 and the lower punch holder 31 are provided with a plurality of punch holding holes 32a and 31a, respectively, which hold the upper punch 5 and the lower punch 6 so as to be slidable. A lower punch cylinder 35 for holding the lower punch 6 at a predetermined height is attached to the punch holding hole 31 a of the lower punch holding portion 31. The mortar 33 is provided with a plurality of mortar holding holes 33 a for detachably holding the mortar 4. The mortar 4 is composed of a mortar body 41 attached to the mortar holding hole 33a, and a wear-resistant sleeve 42 closely fitted on the inner periphery of the mortar body 41. It is. That is, in the rotating disk 3, the lower punch 6, the upper punch 5, and the mill 4 are positioned so that their centers are located on the same straight line.

On the other hand, at the predetermined rotation position of the turntable 3, the upper end of the upper punch 5 having the punch inserted into the die 4 and the lower end of the lower punch 6 having the punch inserted into the die 4 are added while passing over time. An upper roll 7 1 and a lower roll 7 2 are mounted on the shaft at the position where the upper punch 7 and the lower roll 7 2 are mounted. The powder filled into the mortar 4 is pressed and compression-molded.

The upper punch 5 is, as shown in FIG. 3, an upper punch main body 51 and an upper punch tip 52 detachably attached to one end, that is, a lower end of the upper punch main body 51. And guide rollers 53 that roll along the upper punch guide rail mechanism 8.

The upper punch body 51 is held by the upper punch holding portion 32 so as to be vertically movable, and a plurality of upper punch tips 52 having different outer diameters of the punch tip are selectively attached to the lower end thereof. It is something that can be done. At the tip of the upper punch body 51, a plurality of inclined ridges 51a are formed at three places at a distance of 120 ° in the circumferential direction, and between the inclined ridges 51a. Is formed on a flat surface instead of a curved surface. That is, each inclined ridge 51a is a fan-shaped circumferential part having a central angle of about 60 ° with respect to the center of the upper punch body 51. Therefore, the plane portion between the inclined ridges 51a is also formed by removing a curved surface in an angle range of about 60 °.

The upper punch tip 52 is fixed by a cap member 52a and a cap member 52a that are detachably attached to the tip of the upper punch body 51 by a screw action. And a punch tip member 52b. The cap member 52 a is provided with three inclined grooves 52 corresponding to the inclined ridges 51 a of the upper punch body 51 at three places on its inner peripheral wall so as to be screwed to the upper punch body 51. aa is formed. Then, in order to carry out multi-product production, a plurality of punch tip members 52b having different punch tip outer diameters are prepared. Thus, for example, even when manufacturing molded products of different types of outer diameters, the upper punch body 51 can be used in common, and various molded products can be produced simply by exchanging the punch tip member 52b. It can be compression molded. In addition, the compression molding is paused to perform high-mix low-volume production.If the punch tip member 5 2 b of the punch 5 is removed, the powder may adhere to the tip of the punch tip body 51. The cap member 52a is attached to the punch body 51 with the punch tip plug member 54 to be prevented inserted into the cap member 52a, and the punch tip plug member 54 is used. It closes the opening through which the punch tip member 52b of the cap member 52a penetrates.

As shown in FIG. 4, the lower punch 6 includes a lower punch body 61 and a lower punch tip 62 detachably attached to one end, that is, an upper end of the lower punch body 61. At the lower end of lower punch body 6 1 It comprises a switching cam 63 serving as a lower punch switching member constituting a fixed position holding means rotatably mounted, and a lower punch head 64 mounted below the switching cam 63.

The lower punch body 61 has a key member 61a on its side for stopping the rotation, and a lower end for mounting the switching cam 63 is thinner than the other parts. A step of 6 lb is formed at the boundary. The switching cam 63 engages with the stepped portion 61b, and when the switching force 63 is not moved up and down, the lower punch body 61 stops at a predetermined position. . The switching cam 63 has a positioning set pin 61 c for positioning the switching cam 63 in a portion surrounded by the switching cam 63. The positioning set bin 61c is provided in the lower punch body 61, and one of the openings is built into a mounting through hole 61h which is closed by a hexagonal hole set screw 61e. The spring 61d is urged by the spring 61d toward the outer side, that is, the switching cam 63, so that it can be protruded and retracted. The other opening of the mounting through-hole 61h, that is, the opening where the positioning set pin 61c protrudes and retracts, the lower punch body 61 is rotated by the key member 61a. Because it is regulated, it always faces the outside of the turntable 3.

The lower punch tip 62 is, similarly to the upper punch 6, a cap member 62a with a female screw cut inside and a punch fixed by the cap member 62a. It consists of a tip member 62b and a cap. The cap member 6 2a may be the same as that of the upper punch 5. The switching cam 63 has a mounting body 63a and a mounting body 63a. And a cam portion 63b provided at a lower end portion of the camshaft. The mounting body 63 a has a flange 63 aa protruding outward on the outer periphery of the upper end thereof, and a through hole 63 ab at the lower end of which the tip of the positioning set pin 61 c is inserted. And. The flange portion 63 aa is formed on the outer peripheral portion of the mounting body portion 63 a facing away from the outside. The cam portion 63b is integrally formed at the lower end of the mounting trunk portion 63a so as to protrude in the same direction as the flange portion 63aa.

Since the lower punch 6 is prevented from rotating by the key member 61a, the lower punch head 64 is used when the lower punch 6 is guided by the lower punch rail guide mechanism 9 or when the upper and lower rolls 71 are used. It is attached to the lower punch body 61 with a hexagon screw hole set screw 64a so that it rotates by sliding when passing between, 72. The hexagonal screw hole stop screw 6 4 a is attached to the taper part 6 1 m provided at the lower end of the lower punch body 61, and thereby the lower punch head 64 is connected. It is mounted so that it does not fall off rotatably. The set screw 64a with hexagonal screw holes is used as a set of two to prevent loosening.

The lower punch 6 having the above-described configuration is held by a lower punch cylinder 35 attached to the lower punch holding portion 31 so as to be able to move up and down during normal operation, and is also lowered during thinning operation. The punch cylinder 35 holds the predetermined position, that is, the tip of the lower punch 6 at a position flush with the upper surface of the turntable 3. The lower punch cylinder 35 constituting the positioning and holding means has a mounting flange 35a at the lower end, and has an inner peripheral wall near the upper end thereof. Dust seal DS is installed to prevent powder intrusion. Also, the flange 63 a of the switching cam 63 is engaged with the inner groove 35 ba and the inner groove 35 ba at the position inside the mounting flange 35 a. An inner groove portion 35b consisting of a guide groove 35bb is formed. The inner groove 35 ba has substantially the same inner height as the thickness of the flange 63 b, and the guide groove 35 bb has a width that the flange 63 b can pass through. Further, a key groove 35 d with which the key member 61 a slides is provided inside the lower punch cylinder 35.

In this embodiment, a temperature control mechanism for controlling the temperature around the turntable 3, particularly around the mill 4, is provided. This temperature control mechanism is provided in the thickness of the turntable 3 and communicates with the distribution path A, the medium path B and the collecting path C, and the distribution path A provided in the vertical shaft 2 and communicates with the distribution path A. And a discharge path E communicating with the collecting path C. The connecting member 10 is connected to the introduction path D and the discharge path E to allow the temperature control medium to flow. You. The distribution path A and the collecting path C are formed in an annular shape around the axis of the turntable 3. The medium passage B is formed between the dies 4 and communicates the distribution path A and the collection path C. The medium, for example, the cooling water supplied to the introduction path D via the connection member 10 Flows into the distribution path A, flows into the medium passage B, and cools the dies 4. Thereafter, the cooling water flows into the collecting path C, and is discharged from the connecting member 10 to the outside through the discharging path E. In such a configuration, in a normal operation, that is, when the same tablet is pressed in all the dies 3, as shown in FIGS. 5 and 6, as shown in FIGS. The flange 6 3 aa is not engaged with the inner groove 35 ba of the lower punch cylinder 35, that is, the flange 63 aa is not engaged with the lower punch cylinder 35. Cut. In this state, the flange 63 aa is located in the guide groove 35 bb. Accordingly, since the lower punch 6 is not held by the lower punch cylinder 35, the lower punch 6 is guided or urged by the lower punch guide rail mechanism 9 and the lower roll 72 to move up and down. It is. When the lower punch 6 moves up and down, the key member 6 1a slides in the key groove 35d, so that the lower punch main body 6 1 and the lower punch tip 6 2 are centered on the center axis of the lower punch 6. Although the lower punch 6 does not rotate, the lower punch 6 does not twist because the lower punch head 64 rotates. In addition, since the tip of the positioning pin 61 c of the lower punch body 61 protrudes and is inserted into the through hole 63 ab provided in the switching cam 63, the switching force is changed. The rotation of the motor 63 is restricted. In this state, the cam portion 63b of the switching cam 63 comes in sliding contact with the guide portion 9lb of the lowering device 91, and the lower punch 6 moves to the lowest position for filling the powder into the die 4. It will be guided.

Next, when performing the thinning operation, as shown in FIGS. 7 to 9, loosen the cap member 52 a of the upper punch 5 for stopping the powder compression molding, and loosen the punch tip member 52. When the b is removed, the flange 6 3 a of the switching cam 6 3 is engaged with the inner groove 35 ba of the lower punch cylinder 35, and the lower punch 6 is moved so that the tip of the lower punch 6 is on the upper surface of the rotary plate 3. When Hold it flush. To remove the punch tip member 52b, first, as shown in Fig. 7, guide the desired upper punch 5 to the punch set position SET (indicated by an arrow in Fig. 2). Move the punch set member 83 of the rail mechanism 8 in the punch mechanism toward the center of the turntable 3 and lower the guide roller 53 of the upper punch 5 from the punch set member 83. By this operation, the upper punch 5 is lowered by the thickness of the punch set member 83, and the cap member 52a of the upper punch 5 is exposed below the upper punch holding portion 32. It becomes. In this state, when the cap member 52 a is rotated 60 ° counterclockwise, the inclined ridge 51 a of the upper punch body 51 and the inclined groove 52 of the cap member 52 a are rotated. The mating with aa is released, and the cap member 52a is ready to be removed from the upper punch body 51. Then, the punch member 52b is taken out of the cap member 52a, and the punch plug member 54 is put in the cap member 52a instead. Attach the clip member 52a to the upper punch body 51. To attach the cap member 52 a, the inclined groove 52 aa is positioned below the flat portion formed between the inclined ridges 51 a of the upper punch body 51, and the cap member 52 a is attached. Overlay the tip of the upper punch body 5 1. After that, when the cap member 52a is rotated clockwise by 60 °, the inclined groove 52aa is screwed with the inclined ridge 51a, and the cap member 52a is rotated. Attached to upper punch body 51. Then, the upper punch 5 is pulled up, the punch set member 83 is moved to the lower side of the guide roller 53, and is fixed with the port BL.

Next, to hold the lower punch 6 in the above-described state, Insert the rod into the through-hole 63 ab of the switching cam 63 by inserting the positioning pin 61 c inserted into the through-hole 63 ab of the switching cam 63. Push into the lower punch body 6 1. Then, while the tip of the positioning set pin 61c is pulled into the lower punch body 61 from the through hole 63ab, rotate the switching cam 63 approximately 90 °. Then, the flange 63 aa is engaged with the lower punch cylinder 35 specifically, the inner groove 35 ba. Thereby, the switching cam 63 is held by the lower punch cylinder 35 and the lower punch The punch tip of No. 6 is flush with the top of the turntable 3. In the state where the switching cam 63 is rotated in this manner, since the cam portion 63b of the switching cam 63 is positioned in the longitudinal direction of the lowering device 91, the cam portion 63b becomes lower than the lowering device 91. It does not come in contact with the guide section 9 1b of FIG. That is, the switching cam 63 is in a state in which it can escape upward from the opening 91 a of the lowering device 91. When the thinning operation is started, the lower punch 6 is guided by the lower punch 6 as shown by the imaginary line in FIG. 2 because the switching cam 63 is engaged with the lower punch cylinder 35. The rail mechanism 9 moves while maintaining the same height regardless of the configuration of the head portion 64 of the lower punch 6.

Therefore, when the operation is started, each of the upper punch 5 and the lower punch 6 passes between the upper roll 71 and the lower roll 72, but the upper punch 5 which has stopped the compression molding has the punch tip member 52. Since the punch is removed, the tip of the punch is restricted from reaching the mortar 4. In addition, since the lower punch 6 whose compression molding has been suspended has its tip held flush with the upper surface of the rotary disc 3 as described above, The powder to be compressed is not filled into the mortar 4. In this way, removing the punch tip of the upper punch 5 and rotating the switching cam 63 to make the mill 4 substantially non-porous with the lower punch 6 are performed. Thus, it is possible to set the upper punch 5, the lower punch 6, and the mill 4 that suspend the compression of the powder by the thinning operation by a simple operation requiring no skill. Therefore, the work time required for switching between the normal operation and the thinning operation can be reduced. Further, since the mortar 4 is not removed, it is not necessary to clean the powder before the thinning operation.

When performing such a thinning operation, for example, the upper punch 5, the lower punch 6, and the mill 4, which suspend the powder compression, are moved to the upper punch 5, the lower punch 6, and the mill 4 where the powder is compressed. By setting a combination of different dimensions, in other words, a combination for molding a type of molded product, the upper punch 5 and lower punch 6 can be set by one rotary powder compression molding machine. By switching, a large variety can be produced in small quantities. That is, when three kinds of products are produced, a combination of three kinds of upper punches 5, lower punches 6, and dies 4 is set. For example, the first combination of upper punch, lower punch and die is a small tablet, the second combination is a smaller tablet of a larger diameter, and the third combination is a larger tablet. In the case where tablets are produced by the first combination, respectively, the tablets are produced in the above-described manner so that the production by the second and third combinations is stopped. And lower punch 6 are set. In the above embodiment, the tip of the punch was changed independently for both the upper punch 5 and the lower punch 6. By replacing the punch tip member 52b of the upper punch tip 52 and the punch tip member 62b of the lower punch tip 62, it can be easily changed to a different type. Will be able to do so.

In this way, by selecting and operating one of the above-described first combination, second combination, and third combination, the same rotary powder can be obtained. In the compression molding machine, different types of compression molded products, ie, tablets, can be produced without removing the upper punch 5, the lower punch 6, and the mill 4 each time. Therefore, by setting the number of combinations to be greater than the number described above, it is possible to easily produce a large number of products in small quantities.

Note that the present invention is not limited to the above embodiment.

In addition, the specific configuration of each unit is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. Industrial applicability

According to the invention set forth in claim 1, as described in detail above, when adjusting the production amount, it is restricted that the tip of the upper punch is inserted into the die. Since the punch tip of the lower punch corresponding to the upper punch is held almost flush with the upper surface of the turntable, the upper punch, lower punch and mill are rotated at the upper punch and lower punch where the compression operation is stopped. It is possible to reduce the production volume without removing it. Also, the work for such removal This eliminates the need for an operation, which can reduce the time required for changing the production volume. In addition, since the insertion of the tip of the upper punch into the die is restricted, it is possible to prevent the upper punch from contacting the lower punch and causing a failure. Furthermore, since the tip of the lower punch is almost flush with the upper surface of the turntable, the powder to be compressed is not affected even when the mortar is mounted on the turntable. It can be prevented from getting inside.

Claims

The scope of the claims

1. In the frame, a rotating disk is arranged via a vertical shaft so as to be able to rotate horizontally, and a plurality of dies are provided on the rotating disk with predetermined pitches. The upper and lower punches are held up and down so as to be slidable up and down, and the upper and lower punches with the tip of the punch inserted into the mill pass between the upper and lower rolls. In a rotary powder compression molding machine that compresses the filled powder,

The lower punch corresponding to the upper punch, which has limited insertion of the punch tip into the die, is provided with a fixed position holding means for holding the punch tip substantially flush with the upper surface of the turntable. Rotary powder compression molding machine.

2. The fixed position holding means is rotatably mounted on the lower punch and attached to the lower end of the lower punch, and is engaged with the lower punch. 2. The rotary powder compression molding machine according to claim 1, further comprising a lower punch switching member that makes the lower punch substantially flush with the upper surface of the turntable.

3. The lower punch cylinder has an inner groove near the lower end of the inner surface with which the lower punch switching member engages, and the lower punch switching member engages the inner groove of the lower punch cylinder at the upper end thereof. 3. The rotary powder compression molding machine according to claim 2, wherein the rotary powder compression molding machine has a flange portion.

4. The lower punch has a rod that is mounted inside the lower punch switching member at the mounting position and can be protruded and retracted, and the lower punch switching member is not in contact with the inner groove of the lower punch cylinder. Protruding when engaged 4. The rotary powder compression molding machine according to claim 2, wherein the machine has a through hole into which a tip of the ejected rod is inserted.

5. The upper punch consists of a punch body and a punch tip body that has a punch tip that is removably attached to the punch body and inserted into the die, and the lower punch rotates the punch tip. The punch according to claim 1, 2, 3 or 4, wherein the tip of the punch is removed when the punch is held flush with the upper surface of the board. Powder compression molding machine.

6. A plurality of dies having different inner diameters, and a plurality of upper punches and lower punches having punch tips corresponding to the inner diameters of the mortars are attached. Item 3. A rotary powder compression molding machine according to Item 3, Item 4, or Item 5.