JP3052283U - Rotary powder compression molding machine - Google Patents

Abstract

(57) [Summary] [Problem] Powder stays at a powder outlet portion of a stirring feed shoe, and powder leaks into a frame from a lower side of a powder pressing plate. A rotating disk (3) is rotatably disposed in a frame (1) via a vertical shaft (2), and a rotating die (4) having a die hole is provided on the rotating disk (3). Pestle 6
Is held slidably up and down, and the upper punch 5 and the lower punch 6 are passed between the upper roll and the lower roll in a state where the tip of the punch is inserted into the die hole. In the apparatus in which the powder filled in the mortar is compression-molded, a stirring feed shoe 9 rotates in opposite directions to agitate the powder on the turntable 3, and a pair of stirring blades 91. A housing 92 for accommodating the stirring blades 91, wherein the housing 92 has an inclined surface 96 a inclined upward with respect to the moving direction of the powder due to the rotation of the turntable 3 at the end side of the passage path of the mill 4 passing below the housing 92. The tip of the stirring blade 91 passes through the upper edge of the inclined surface 96a.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a rotary powder compression molding machine for compressing powder to form a tablet or the like, and more particularly to a rotary powder compression molding machine capable of improving a substantial amount of powder used. .

[0002]

[Prior art]

 Conventionally, such a rotary powder compression molding machine has been known in which a powder called a stirring feed shoe is stirred on a rotating disk and supplied to the mortar in order to uniformly supply the powder to the mortar. Have been. The stirring feed shoe accommodates stirring blades rotating in opposite directions in a housing, and supplies the powder to each mill passing below the stirring blades while stirring the powder in the housing. This is to ensure even filling. For this purpose, the stirring blade is mounted in the housing so as to rotate while floating from the turntable. In addition, a seal member is provided on the bottom of the housing so as to prevent the powder in the housing from scattering to the outside.

[0003]

[Problems to be solved by the invention]

 By the way, a powder pressing plate is attached to the bottom surface of the housing at the terminal end of the housing where the die has passed under the housing in accordance with the path of the die in order to ensure powder filling. This powder pressing plate has its bottom surface flush with the bottom surface of the housing, and is mounted so that no gap is formed between the rotating plate and the housing. For this reason, no seal member is provided in the portion of the powder pressing plate.

In such a structure, the excess powder not filled in the mortar is stirred again by the stirring blades and filled in the mortar. However, due to the thickness of the powder pressing plate, the powder pressing is suppressed. Excess powder may stay at the edge of the plate. This is because the movement of the powder is hindered by the thickness of the powder pressing plate. On the other hand, the rotating disk is theoretically installed so as to rotate in a single horizontal plane. However, due to operations such as compression of the powder, there is a case where a minute surface deviation actually occurs. When such a run-out occurs, a slight gap is created between the powder presser plate and the turntable, and the powder remaining at the powder presser plate leaks out of the gap. There is. For this reason, the powder wasted and production efficiency was reduced. In addition, useless powder was present inside the molding machine due to the leaked powder, which necessitated cleaning, and maintenance and management became complicated.

[0005] The present invention aims to solve such a problem.

[0006]

[Means for Solving the Problems]

 The present invention takes the following measures to achieve such an object. That is, in the rotary powder compression molding machine according to the present invention, the stirring feed shoe is provided with an inclined surface that is inclined upward with respect to the moving direction of the powder due to the rotation of the turntable at the end side of the passage path of the mill. The tip of the stirring blade passes through the upper edge of the inclined surface.

[0007]

[Embodiment of the invention]

 According to the present invention, a rotating disk is rotatably arranged in a frame via a vertical shaft, and a die having a die hole is provided on the rotating disk, and an upper punch and a lower punch can be slid vertically above and below the die. By holding the punch and inserting the tip of the punch into the die hole, the upper punch and the lower punch are passed between the upper roll and the lower roll, so that the powder is stirred into the die hole by the stirring feed shoe. In a rotary powder compression molding machine designed to compact the powder, a stirring feed shoe rotates in opposite directions to agitate the powder on a turntable, and a pair of stirring blades. A housing for accommodating the housing, the housing having an inclined surface that is inclined upward with respect to the moving direction of the powder by the rotation of the turntable at the end side of the passage path of the die passing below the housing. The upper edge of A rotary powder compression molding machine, wherein a distal end portion of the 拌羽 roots to pass through.

With this configuration, the powder conveyed to the terminal side of the passage of the mortar by the rotation of the turntable is conveyed to the vicinity of the tip of the rotating stirring blade guided by the inclined surface. . Therefore, it does not go under the inclined surface, that is, under the housing. The powder conveyed in this manner is again stirred by the stirring blades, and does not stay at or near the inclined surface. Therefore, the efficiency of filling the powder into the mortar is improved. In addition, even if there is a gap between the rotating disk and the runout, the amount of powder leaking to the outside is drastically reduced, so that the effective utilization rate of the powder is increased and the cleaning operation can be simplified, Maintenance work becomes easier.

In order to simplify the maintenance work, it is preferable that the inclined surface is detachably provided. By making the inclined surface detachable in this way, it is possible to restore the expected performance by replacing only the inclined surface during maintenance. Examples of the housing include a housing body that houses the stirring blades, and a bottom plate member attached to the bottom of the housing body, the bottom plate member having an inclined surface. In the housing having such a configuration, it is desirable that the inclined surface is provided on an auxiliary plate that is detachably fixed flush with the bottom surface of the bottom plate member. It is preferable that the auxiliary plate is biased by an elastic member in the direction of the bottom surface of the bottom plate member so that the auxiliary plate can flexibly cope with a run-out of the turntable.

The above-mentioned auxiliary plate is desirably made of a synthetic resin from the viewpoints of friction resistance, durability, non-adhesion performance of powder, and the like. Further, the bottom plate member may be configured to be detachably fixed to the housing body.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In this rotary powder compression molding machine, a rotating 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 provided on the rotating disk 3 at a predetermined pitch. An upper punch 5 and a lower punch 6 are vertically slidably held above and below the mortar 4. With the respective tips of the upper punch 5 and the lower punch 6 inserted into the dies 4, a preload upper roll 81, a preload lower roll 82, and a main pressure upper roll, which form a main pressure roll pair, which form a pair of preload rolls. When the powder is passed between the main roll and the lower roll (not shown) in this order, the upper roll and the lower roll form the vertical shaft 2 so that the powder filled in the die 4 can be compression-molded. It is arranged at the vertical position of the turntable 3 as a center. A powder feeding mechanism 7 for supplying powder into the mill 4 is attached to the turntable 3 from above the turntable 3. A stirring feed shoe 9 is attached to a lower end of the powder feeding mechanism 7.

An upright shaft 2 supported by a bearing 21 is disposed substantially at the center of the frame 1, and a worm wheel 22 is fixed near the lower end of the upright shaft 2. The rotational driving force of the motor 25 is transmitted through the worm 23 and the belt 24. In the vicinity of the upper end of the upright shaft 2, a turntable 3 divided into three functional parts is fixed.

The turntable 3 is provided at a lower portion thereof and holds a lower punch 6 so as to be slidable up and down, and is provided at an upper portion and holds the upper punch 5 so as to be slidable up and down. A plurality of die mounting holes are provided on the same circumference, and are provided between the upper punch holding portion 31 and the upper punch holding portion 31 and the lower punch holding portion 32 so that the die 4 can be removably fitted. It is composed of a plurality of mortar portions 33 provided. The upper punch holding portion 31 and the lower punch holding portion 32 are each provided with a plurality of punch holding holes for slidably holding the upper punch 5 and the lower punch 6. In the rotating disk 3, the lower punch 6, the upper punch 5, and the die 4 are formed with respective punch holding holes and die mounting holes so as to be positioned in the vertical direction, that is, the centers thereof are on the same straight line. I have.

The upper punch 5 held on the turntable 3 is guided to the highest position in the vicinity of the powder feeding mechanism 7 by a running rail 11 mounted near the upper end of the upright shaft 2, and is guided to the upper roll. At the reaching position, it is guided to a lower position where it goes under the roll. The lower punch 6 is moved up and down by a lowering device 61 provided on the lower side of the turntable 3. After the compression by the main rolling roll is completed, the lower punch 6 is moved to the highest position when removing the molded product from the die 4. You will be guided to.

The preload upper roll 81 and the preload lower roll 82 of the preload roll pair have their centers located on the same line in the vertical direction, and the upper punch 5 and the lower punch 6 apply a predetermined pressure to the powder in the die 4. Are arranged at a predetermined distance between the circumferential surfaces facing each other in the vertical direction. Similarly, the main pressure upper roll and the main pressure lower roll of the main pressure roll pair are arranged at predetermined positions.

The agitating feed shoe 9 includes a pair of agitating blades 91 that rotate in opposite directions to agitate the powder on the turntable 3, and a housing 92 that accommodates the agitating blades 91. The stirring blade 91 has a structure in which, for example, twelve blades 91b of the same length extend radially from the central mounting flange 91a. Each of the blades 91b has a stirring surface 91c that is inclined upward in the rotation direction. Therefore, the left and right stirring blades 91 are symmetrical. These stirring blades 91 are driven by a plurality of gears 91d and rotate in opposite directions to form a housing body 93 constituting a housing 92 and a bottom plate member 94 attached to the lower surface of the housing body 93. It is accommodated in the formed bottom space. The stirring blades 91 are arranged at a substantially central portion in the longitudinal direction of the stirring feed shoe 9 so that the tips thereof overlap so that they do not collide with each other when rotated. Each of the stirring blades 91 is attached to the housing 92 in a state where the stirring blades 91 float above the bottom plate 94a of a bottom plate member 94 of the housing 92, that is, with a gap between the lower surface of the stirring blade 91 and the upper surface of the bottom plate 94a.

The housing 92 is assembled by fixing a bottom plate member 94 to the bottom of the housing main body 93 so as to be attachable and detachable with bolts. The bolt penetrates the housing body 93 from the upper side of the housing body 93 to reach the bottom plate member 94, and its tip does not project from the lower surface of the bottom plate member 94. The housing main body 93 has a first housing portion 93a for housing the driving gear 91d in an upper half portion, and a second housing portion 93b for housing the stirring blade 91 in a lower half portion. The housing main body 93 is provided with a powder injection opening 93c on the upper surface avoiding the first storage portion 93a so that the second storage portion 93b communicates with the powder injection mechanism 7. The second accommodating portion 93b has an inner diameter larger than the outer diameter of the stirring blade 91.

On the other hand, the bottom plate member 94 has a flat plate shape, and the bottom plate 94a closes most of the lower opening of the second storage portion 93b. The bottom plate 94a is provided with an arc-shaped groove 94b in a portion that becomes a passage of the mill 4 when the stirring feed shoe 9 is mounted at a predetermined mounting position. A rib 94c having a height of about 1/2 of the depth of the groove 94b is provided on the starting end side of the groove 94b to improve the filling property of the powder. A sealing member 95 made of synthetic resin is provided on the lower surface of the bottom plate 94a so as to surround the groove 94b. Further, a powder holding plate 96 serving as an auxiliary plate for rubbing the powder conveyed by the rotation of the turntable 3 is provided at the terminal end side of the groove 94b, that is, at the terminal end 94d on the side where the powder exits the stirring feed shoe 9. However, it is detachably attached with bolts. As described above, if the powder pressing plate 96 is formed separately from the bottom plate member 94 and is configured to be detachable, it can be easily replaced when the powder pressing plate 96 is worn out, so that the expected performance is always obtained. Can be secured.

The powder pressing plate 96 is made of the same synthetic resin as the sealing member 94, and is mounted with its lower surface flush with the lower surface of the bottom plate member 94. In the mounted state, the powder pressing plate 96 faces the starting end of the groove 94b. The inclined surface 96a is provided. That is, the inclined surface 96a is inclined upward with respect to the direction of powder movement due to the rotation of the rotary plate 3, and the upper edge thereof is at the same height as the upper surface of the bottom plate 94a of the bottom plate member 94.

In such a configuration, the stirring feed shoe 9 is fixed so that the groove 94 b coincides with the path along which the mill 4 moves. When the rotary powder compression molding apparatus is operated, the stirring blade 91 of the stirring feed shoe 9 rotates, and the powder supplied from the powder input mechanism 7 is stirred. With the powder stored on the upper surface of the bottom plate 94a of the bottom plate member 94, the powder is guided toward the center in the longitudinal direction of the groove 94b by the rotation of the stirring blades 91 rotating in opposite directions. In the groove 94b, the mill 4 is moved by the rotation of the turntable 3, and the powder is uniformly filled in each mill 4. In this case, since the stirring blades 91 are floating above the upper surface of the bottom plate 94a, the blades 91b are located on the mortar 4 to hold down the powder. An uneven filling state due to the position of the blade 91b, which indicates that the powder does not enter the mortar 4, does not occur. Therefore, the filling performance of the powder can be improved.

The powder swells on the mortar 4 by an amount corresponding to a gap from the inner upper surface of the bottom plate member 94 to the lower surface of the stirring blade 91, and moves to the terminal end 94 d of the groove 94 b with the rotation of the turntable 3. Moving. The powder that has moved to the end portion 94d side collides with the powder pressing plate 96, is guided by the inclined surface 96a, and moves to the upper surface of the bottom plate 94a of the bottom plate member 94. That is, when the powder moves to the terminal end portion 94d of the groove 94b, the powder is pushed by the powder on the turntable 3 and thus can move upward along the inclined surface 96a. The moved powder is pushed back to the groove 94b side by the stirring blade 91 located on the right side, so that it is stirred again and filled in the mortar 4.

Therefore, even if the powder collides with the powder pressing plate 96, the powder does not stay at the position of the powder pressing plate 96, that is, at the terminal end 94 d of the groove 94 b. For this reason, even if the rotating disk 3 is run-out and a gap is formed between the lower surface of the powder pressing plate 96 and the rotating disk 3, the amount of powder entering the gap is extremely small, and the mounting clearance of the stirring feed shoe 9 is clear. Only the amount of powder that leaks out leaks. Thus, the amount of wasted powder can be reduced as much as possible. Further, since the amount of the leaking powder becomes small, the powder scattered in the frame 1 is almost eliminated, and the time required for cleaning can be reduced.

The present invention is not limited to the embodiment described above. For example, as shown in FIG. 8, the bottom plate member 194 may have only a thickness for improving the filling property of the powder, and may have a frame shape without a bottom plate or a substantially annular shape. In this case, the inclined surface 196a is formed in an arc shape at the edge of the powder pressing plate 196, and corresponds to the predetermined position of the bottom plate member 194, that is, the position corresponding to the terminal end portion 94d in the above-described embodiment that crosses the locus through which the mill 4 passes. It should just be attached to and detached from. In the case of this example, the width of the powder pressing plate 196 is larger than the width of the passage of the mill 4, so that the surface of the turntable 3 can be widely covered.

The powder pressing plate 296 having the inclined surface 296a is urged by an elastic member 297 such as a coil spring, for example, to the lower surface of the bottom plate member 294 having the bottom plate 294a, that is, downward, similarly to the above embodiment. May be used. In this case, as shown in FIGS. 9 and 10, the elastic member 297 is provided with a hole formed in a downward direction at a portion corresponding to the powder pressing plate 296 of the housing body 293, and the base 296b of the powder pressing plate 296 is formed. In this case, an upward hole is formed at the corresponding position, and the elastic member 297 is inserted into both of the holes, so that the elastic member 297 is attached so as to be sandwiched between the powder pressing plate 296 and the housing body 293. . In this example, two elastic members 297 are used, but may be one, or two or more.

As described above, by pressing the powder pressing plate 296 downward, even if a gap is generated due to the runout of the rotating disk 3, the gap can be reduced to a minimum. Therefore, the amount of powder leaking from the terminal side can be further reduced, and the waste of powder can be almost eliminated, and the scattering into the frame 1 can be reduced, thereby facilitating maintenance. be able to.

In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention. The inclined surface itself may be provided on the bottom plate member. In this case, the inclined surface may be set at an inner position just before the mill has passed through the stirring feed shoe, and may be provided so as to be inclined upward in the rotating direction of the turntable.

[0027]

[Effect of the invention]

 As described above, according to the present invention, the powder conveyed to the end side of the passage of the mortar by the rotation of the rotating disk is conveyed to the vicinity of the tip of the rotating stirring blade guided by the inclined surface. It can be prevented from getting under the inclined surface, that is, under the housing. Therefore, the conveyed powder is again stirred by the stirring blades and does not stay on the inclined surface or in the vicinity thereof, so that the use efficiency of the powder can be improved and the efficiency of filling the powder into the mill can be improved. Can be improved. In addition, even if a gap occurs between the rotating disk and the surface running, the amount of powder leaking to the outside is drastically reduced, so that the effective utilization rate of the powder is increased, and the cleaning work can be simplified, and the maintenance work can be simplified. Can be facilitated.

If the inclined surface is provided detachably, maintenance can be simplified by making the inclined surface detachable, and at the time of maintenance, the expected performance is restored by replacing only the inclined surface. can do. If the housing comprises a housing body for accommodating the stirring blade and a bottom plate member attached to the bottom of the housing body, and if the bottom plate member has an inclined surface, the inclined surface is formed separately from the housing body. Since it can be processed, production can be facilitated. In addition, if the inclined surface is provided on an auxiliary plate that is detachably fixed flush with the bottom surface of the bottom plate member, maintenance can be simplified and desired performance can always be maintained. Further, if the auxiliary plate is urged by the elastic member in the direction of the bottom surface of the bottom plate member, it can flexibly cope with the runout of the turntable. If such an auxiliary plate is made of a synthetic resin, friction resistance, durability, non-adhesion performance of powder, and the like can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an entire configuration of an embodiment of the present invention.

FIG. 2 is a partially omitted plan view showing, on an enlarged scale, an attached state of the stirring feed shoe of the embodiment.

FIG. 3 is a plan view of the housing of the embodiment.

FIG. 4 is a plan view of a bottom plate member in a state where the stirring blades of the embodiment are arranged.

FIG. 5 is a sectional view of the stirring blade of the embodiment.

FIG. 6 is a sectional view taken along the line AA in FIG. 3;

FIG. 7 is an enlarged cross-sectional view of a main part showing a mounted state of the powder pressing plate of the embodiment.

FIG. 8 is a view corresponding to FIG. 4 of another embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a main part showing another mounting structure of the powder pressing plate of the present invention.

FIG. 10 is a plan view of a bottom plate member to which the powder pressing plate shown in FIG. 9 is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Standing shaft 3 ... Rotating disk 4 ... Die 5 ... Upper punch 6 ... Lower punch 9 ... Stirring feed shoe 91 ... Stirring blade 92 ... Housing 96a ... Inclined surface

Claims (7)

[Utility model registration claims] 1. A rotary disk is rotatably disposed in a frame via a vertical shaft, and a rotary die is provided with a die having a die hole, and an upper punch and a lower punch can be vertically slid above and below the die. The powder filled into the die hole is stirred by the agitating feed shoe by passing the upper punch and the lower punch between the upper roll and the lower roll with the punch tip inserted into the die hole. In a rotary powder compression molding machine, a stirring feed shoe rotates in opposite directions to agitate the powder on a rotating disk, and a housing for accommodating the stirring blades. The housing has an inclined surface that is inclined upward with respect to the moving direction of the powder due to the rotation of the turntable at the end side of the passage path of the die passing below the housing, and the vicinity of the inclined surface is stirred. wing A rotary powder compression molding machine characterized in that the tip of the root passes therethrough. 2. The rotary powder compression molding machine according to claim 1, wherein the inclined surface is detachably provided. 3. The housing according to claim 1, wherein the housing comprises a housing body accommodating the stirring blades, and a bottom plate member attached to the bottom of the housing body, the bottom plate member having an inclined surface. Or the rotary powder compression molding machine according to 2. 4. The rotary powder compression molding machine according to claim 3, wherein the inclined surface is provided on an auxiliary plate which is detachably fixed flush with the lower surface of the bottom plate member. 5. The rotary powder compression molding machine according to claim 4, wherein the auxiliary plate is urged by an elastic member toward a bottom surface of the bottom plate member. 6. The rotary powder compression molding machine according to claim 4, wherein the auxiliary plate is made of a synthetic resin. 7. The rotary powder compression molding machine according to claim 3, wherein the bottom plate member is detachably fixed to the housing body.