JPH09122990A - Tableting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deposition of raw material powder on the front surface of a partition ring by constituting this partition ring so as to have the front surface of a prescribed width along with the rear surface of an upper pestle holder and to face the rear surface of the upper pestle holder by having a clearance. SOLUTION: The raw powder supplied atop a rotary disk 3 from a supply port successively disposed at the bottom end 2a of a hopper 2 are evenly gathered onto the rotary loci of respective mortars 4 by a feed shoe 11 during the operation of this tableting machine. The raw material powder leveled off evenly by leveling-off ribs 11b soar up slightly but the feed shoe is formed to a tunnel shape covered with the feed shoe 11a at its front surface and, therefore, the casual splashing of the soaring up raw material powder does not arise. The front surface of the cross wall part 15b of the partition ring 15 faces the rear of the upper pestle holder by having the clearance of 0.05 to 0.10 and, therefore, the deposition and drop of the raw material powder do not arise. The amt. of the raw material powder to be packed is increased and the production of the tablets having excessive weights is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tableting machine, and more particularly to a tableting machine capable of preventing tableting of an overweight tablet in advance.

[0002]

2. Description of the Related Art As a tableting machine for compressing raw material powder to form tablets for medicines, quasi-drugs, cosmetics, agricultural chemicals, feeds, foods, etc., a plurality of mortars filled with the raw material powder are concentrically arranged. Conventionally, a rotary disc provided with a plurality of upper punches and lower punches that are rotated together with the rotary disc to compress the raw material powder filled in each of the dies up and down to form tablets is generally used. Known (JP-A 5-318198, JP-A 7-
No. 8540).

In the above tableting machine, it is important to make the amount of the raw material powder filled in each die uniform. For this reason, generally, the raw material powder is accurately measured by a hopper and supplied onto the rotating disc, and the supplied raw material powder is fed onto the rotating disc as an immovable member on the rotary locus of each mill by a feed shoe installed on the rotating disc. In addition, the surplus raw material powder is guided to the inner peripheral side of the rotation locus of each mill and is again uniformly accumulated on the rotation locus of each mill by the feed shoe. Then, by scraping off the raw material powder evenly accumulated on the rotation trajectory of each mortar with a scraping damper in contact with the upper surface of the rotary disk, an equal amount of the raw material powder is filled in each mortar and the feed shoe is used to The upper surface of the turntable is divided into inner and outer parts by a partition plate so that the excess raw material powder guided to the inner circumference side from the rotation path of the mill is not scattered and mixed into each mill side.

[0004]

By the way, the feed shoe of the conventional tableting machine has a structure in which the upper surface is opened. The partition ring has an L-shaped cross section having a vertical wall portion standing on the rotary disc and a lateral wall portion bent from the upper end thereof to the inner peripheral side of the rotary disc, and the upper surface of the horizontal wall portion has the upper punches mentioned above. Is vertically slidably held and faces a lower surface of the upper punch holder facing above the turntable with a large gap.

Therefore, in the tableting machine of the conventional example, during operation, the fine raw material powder soars from the upper surface of the feed shoe and scatters, and a large amount of this powder is deposited on the upper surface of the partition ring and eventually falls on the rotating disk. The phenomenon of doing is seen.

In this case, if the deposited raw material powder falls on the outer peripheral side of the partition ring, it may be mixed with the raw material powder in the die before compression molding and the filling amount of the raw material powder may locally increase. In addition, even if the raw material powder falls to the inner peripheral side of the partition ring, the amount of the raw material powder which is accumulated evenly on the rotation trajectory of each mill by the feed shoe as the surplus raw material powder is locally increased. As a result, the raw material powder filled in the die may be locally increased. In any case, it is expected that the filling amount of the raw material powder will be locally increased and a tablet having an excessive weight will be compressed.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent the situation in which the filling amount of the raw material powder is locally increased and an overweight tablet is compressed. To provide a tablet machine.

[0008]

The tableting machine of the present invention comprises a turntable in which a plurality of mortars filled with raw material powder are concentrically arranged, and the turrets are rotated together with the turntables in the mortars. A plurality of upper and lower pestle for compressing the filled raw material powder up and down to form tablets, and facing the upper surface of the rotating disk as a stationary member,
A feed shoe that uniformly accumulates the raw material powder supplied onto the rotating disk on the rotation locus of each die and guides and discharges the excess raw material powder toward the inner peripheral side from the rotation locus of each die, and a stationary member. As a premise that it is provided with a partition ring that faces the upper surface of the rotary disk and partitions the upper surface of the rotary disk into the inside and outside so that the excess raw material powder discharged from the feed shoe is not scattered to the mortar sides. To do.

Here, the feed shoe has a tunnel shape in which the upper surface is covered to prevent the raw material powder from soaring from the upper surface and scattering during operation of the tableting machine. The partition ring has an upper surface of a predetermined width along the lower surface of the upper punch holder that holds the upper punches slidably in the vertical direction and faces the upper side of the turntable, and the upper surface has the upper punch holder. It is characterized in that the raw material powder is prevented from being deposited in large quantities on the upper surface by facing the lower surface with a predetermined clearance.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. The tableting machine of the present invention, as shown in FIG. 2, has an external appearance provided with a hopper (2) into which a raw material powder is put in an upper part of a housing (1), and a rotating disk (3) is provided in the housing (1). Is installed.

As shown in FIG. 1, the turntable (3) is rotationally driven around the vertical axis in a counterclockwise direction at a constant speed.
A plurality of mortars (4) are concentrically arranged at a predetermined pitch on the turntable (3). Above the turntable (3), as shown in FIG. 3, an upper punch holder (6) holding a plurality of upper punches (5) corresponding to the dies (4) slidably in the vertical direction.
Is facing. A lower punch holder (not shown) holding a plurality of lower punches (7) corresponding to the dies (4) slidably in the vertical direction is located below the turntable (3). The upper punch holder (6) and the lower punch holder are integrally configured to rotate integrally with the turntable (3).

As shown in FIG. 3, at the lower end portion (2a) of the hopper (2), the raw material powder that opens near the rotation locus of each mill (4) on the rotating disk (3) is opened. The supply port (2b) is continuously arranged so that the vertical position can be adjusted.

The mortar (4) has a mortar hole (4
a). On the other hand, the upper punch (5) and the lower punch (7)
Is controlled to move up and down by following a guide rail or cam (not shown). Then, as shown in FIG. 4, in the step of filling the raw material powder, the upper end of the lower punch (7) is fitted into the die hole (4a) so that the hopper (2)
The raw material powder supplied onto the rotating disk (3) from the supply port (2b) connected to the lower end (2a) of the is filled in the die hole (4a). In the subsequent compression molding step of the raw material powder, the lower end of the upper punch (5) is fitted in the die hole (4a) while the upper end of the lower punch (7) is fitted in the die hole (4a), and the lower punch ( 7) and the upper punch (5) are sequentially pressed by the pair of preload rolls (8, 8) and the pair of main pressure rolls (9, 9), so that the raw material powder filled in the die hole (4a) is discharged. Compressed into tablets. Then, the compression-molded tablets have the upper punch (5) retracted upward and the lower punch (7) moved upward so that the upper end thereof faces the rotary disc (3) in the discharging step, whereby the rotary disc (3) ) Is discharged on.

On the other hand, a support base (10), which is an immovable member, is installed below the hopper (2) so as to face the peripheral surface of the rotating disk (3). And this support base (1
The feed shoe (11) and the scraping damper (12) connected to 0) face the upper surface of the turntable (3). The partition ring (15), one end of which is connected to the scraping damper (12) and the other end of which is connected to the support plate (14) which is another immovable member through the tablet take-out damper (13), is also used as the feed. Turntable (3) on the side opposite the shoe (11)
Facing the upper surface of. Incidentally, these feeder (11), leveling damper (12), the tablet extraction damper (13), the bottom of such a partition ring (15), Surido抵
If a synthetic resin with low resistance or hard felt is attached
Have been .

As shown in FIG. 3, the feed shoe (11) is covered with a feed shoe cover (11a) at its upper surface to form a tunnel shape having a circular arc shape in a plan view and straddle the rotation locus of each mill (4). I'm out. The feed shoe (11) has a plurality of equalizing ribs (11b) that are bent in a V shape in plan view and have an arrow shape that points in the rotation direction of the turntable (3). When the leveling ribs (11b) face a predetermined height above the turntable (3), the turntable (3) is connected to the lower end (2a) of the hopper (2) from the supply port (2b). )
The raw material powder supplied to the upper surface of the mortar (4) is evenly accumulated on the rotation trajectory of each mortar (4). The feed shoe (11) has guide ribs (11) near the upper end of the rotary disc (3) at the front end of the rotary disc (3) in the rotation direction.
c), and the guide ribs (11c) guide the surplus raw material powder to the inner peripheral side from the rotation locus of each mill (4).

The scraping damper (12) is arranged near the guide rib (11c) of the feed shoe (11).
This scraping damper (12) slidably crosses the rotation locus of each mortar (4) and comes into sliding contact with the upper surface of the turntable (3),
The raw material powder filled in the die holes (4a) of each die (4) is scraped off at the position of the upper surface of the rotating disk (3). The scraping damper (12) is provided with a pressing plate (16) for pressing down and smoothing the upper surface of the scraped raw material powder.

The partition ring (15) has an arcuate shape in plan view extending along the inner side of the rotation locus of each die (4). This partition ring (15), as shown in FIG.
It has an L-shaped cross section having a vertical wall portion (15a) standing upright on the upper surface of the turntable (3) and a horizontal wall portion (15b) bent from the upper end thereof to the inner peripheral side of the turntable (3). A synthetic resin or hard felt (17) is attached to the lower portion of the vertical wall portion (15a) so as to be in sliding contact with the upper surface of the rotating disk (3). And this partition ring (15)
The guide ribs (11c) of the feed shoes (11) prevent the excess raw material powder guided to the inner peripheral side from the rotation locus of each mill (4) from being dissipated to each mill (4) side. The upper surface is partitioned inside and outside.

Here, the upper surface of the lateral wall portion (15b) of the partition ring (15) faces the lower surface of the upper punch holder (6) with a predetermined clearance (1.0 to 5.0 mm). There is. The thickness of the horizontal wall portion (15b) may be the same as that of the vertical wall portion (15a) or may be thicker than that. The partition ring (15) may have a T-shaped cross section.

Next, the operation of the embodiment constructed as described above will be described. During operation of the tableting machine, the raw material powder supplied from the supply port (2b) connected to the lower end portion (2a) of the hopper (2) to the upper surface of the turntable (3) is fed by the feed shoe (11). It is accumulated evenly on the rotation trajectory of the mortar (4). At this time, the raw material powder evenly leveled by the leveling ribs (11b) is slightly lifted up, but the feed shoe (11) has a tunnel shape whose upper surface is covered with the feed shoe cover (11a). Since it is done, the raw material powder that has risen up does not accidentally scatter.

Further, the lateral wall portion (1) of the partition ring (15)
The upper surface of 5b) faces the lower surface of the upper punch holder (6) with a predetermined clearance (0.05 to 0.10 mm), so that there is room for a large amount of scattered raw material powder to accumulate on the upper surface. Absent. Therefore, a large amount of scattered raw material powder accumulates and falls on the rotating disk (3), and the mortar holes (4a) of each mortar (4)
The filling amount of the raw material powder to be filled therein is not locally increased, and the situation of tableting an overweight tablet is prevented in advance.

In the discharging process shown in FIG. 4, the rotating disk (3)
The tablets discharged above are conveyed to the outer peripheral side of the rotary disk (3) via the tablet take-out damper (13) shown in FIG.
The surplus raw material powder partitioned inside by the partition ring (15) is again introduced into the feed shoe (11) as the rotary disk (3) rotates.

[0022]

As described above, according to the present invention, since the feed shoe has a tunnel shape with its upper surface covered, the raw material powder soars from the upper surface of the feed shoe during operation of the tableting machine. Since the upper surface of the partition ring faces the lower surface of the upper punch holder with a certain clearance, a large amount of raw material powder accumulates on the upper surface and falls onto the turntable. There is no. Therefore,
It is possible to prevent a situation in which the amount of the raw material powder filled locally increases and a tablet with an excessive weight is compressed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a partial cross-section of a main structure of an embodiment of a tableting machine according to the present invention.

FIG. 2 is a front view showing the outer appearance of one embodiment.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a schematic work process diagram showing a work process of one embodiment.

FIG. 5 is a sectional view taken along line VV of FIG. 1;

[Explanation of symbols]

 1: Housing 2: Hopper 2a: Lower end 2b: Supply port 3: Rotating plate 4: Mortar 4a: Mortar 5: Upper punch 6: Upper punch holder 7: Lower punch 8: Preload roll 9: Main pressure roll 10: Support Base 11: Feed shoe 11a: Feed shoe cover 11b: Leveling rib 11c: Guide rib 12: Scraping damper 13: Tablet ejection damper 14: Support plate 15: Partition ring 15a: Vertical wall portion 15b: Horizontal wall portion 16: Presser plate 17: felt

Claims (1)

[Claims] 1. A rotary disc in which a plurality of mortars filled with raw material powders are concentrically arranged, and a tablet obtained by rotating the rotary discs together with the raw powders vertically compressed into tablets. A plurality of upper pestle and lower pestle for forming the, and a raw material powder which is faced to the upper surface of the rotary disc as an immovable member and is uniformly accumulated on the rotary locus of each mortar and the surplus raw material. A feed shoe that guides and discharges the powder toward the inner peripheral side from the rotation trajectory of each mortar, and a surplus raw material powder discharged from the feed shoe that faces the upper surface of the rotating disk as a stationary member and dissipates to the mortar side. In a tableting machine equipped with a partition ring for partitioning the upper surface of the turntable inside and outside, the feed shoe has a tunnel shape with the upper surface covered, and the partition ring slides vertically on the upper punches. Hold it freely and place it on the turntable A tableting machine characterized in that it has an upper surface of a predetermined width along the lower surface of the upper punch holder facing toward one side, and the upper surface faces the lower surface of the upper punch holder with a predetermined clearance.