JPH0726073Y2 - Rotary powder compression molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotary powder compression molding machine for compressing a powder material in a die of a rotary disk through an upper punch and a lower punch to mold tablets and the like. The present invention relates to an improvement in sliding structure of a punch.

[Prior Art] The pestle (upper pestle and lower pestle) of the rotary powder compression molding machine has a punch guide formed on the punch guide collar for the upper punch and the punch guide collar for the lower punch, which are integrally provided on the turntable. It is provided so as to pass through the hole and move up and down while sliding along the guide hole. The thickness of each punch guide collar is when the diameter of the punch is d (2-2.5)
Those of d or more are common. The punch guide hole is formed continuously over the entire thickness of the punch guide collar.

[Problems to be solved by the invention] As described above, in the related art, since the punch slides in the punch guide hole that is continuous over the entire thickness of the punch guide collar, the sliding area of the punch is large and the sliding portion of the punch is large. The resistance is naturally great. By the way, despite various dust-proof measures being applied to the sliding part of the punch,
It is difficult to make the reliability perfect, and the lubricating oil to the sliding portion may be insufficient.

Therefore, if dust invades the sliding part or if oil runs out, the sliding resistance of the pestle will increase further, and if it rises, the abrasion of the pestle and the pestle guide track will be promoted, further leading to galling and seizure. . Further, in the conventional punch sliding structure in which the punch guiding flange has the thickness as described above, there is also a problem that the weight of the turntable is large.

An object of the present invention is to obtain a rotary powder compression molding machine capable of reducing sliding resistance of a punch and reducing the weight of a rotary disk.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a rotary powder in which a punch guide collar provided on a rotary disk is provided with a number of punches slidably passing through the punch guide holes of the collar. In the compression molding machine, an annular groove that is open to the peripheral surface of the punch guide collar and is continuous in the circumferential direction and has a depth that reaches the inside of the moving path of the punch is provided in the punch guide collar. Upper and lower punch support parts forming the punch guide collars are formed on both upper and lower sides of the punch, and the punch guide holes are provided in the punch support parts so as to face each other, and the punches are respectively provided in the punch guide holes of the upper and lower punch support parts. It is provided slidably through, and
A dustproof cover for closing the opening of the annular groove is provided.

[Operation] According to the present invention, the punch guide collar of the rotary disc is provided with the annular groove having a depth reaching the inner side of the moving path of the punch. Therefore, the weight of the rotary disc can be reduced corresponding to the volume of the groove. Further, since the annular groove is provided, the sliding resistance of the punch does not correspond to the width of the groove, and the sliding resistance of the punch is supported by the upper and lower punch supports located on the upper and lower sides of the annular groove. Only the sliding resistance in the punch guide hole of the section can be used. Therefore, the sliding resistance of the pestle becomes smaller, and the external force that tries to incline the pestle can be supported by the upper and lower pestle support portions regardless of such a reduction in the sliding resistance. Is not compromised. Moreover, the dustproof cover prevents dust from entering the annular groove from the outside, and reduces the increase in sliding resistance between the punch guide hole and the punch due to the dust.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 denotes an upper frame which is arranged and fixed above a fixed lower frame (not shown) included in the main body frame, and the four corners of both frames are connected to each other through columns (not shown). The support cylinder 2 is attached to the upper surface of the lower frame, and various lower punch drive members that are located around the cylinder 2 and that move the lower punch 3 up and down are disposed. In FIG. 1, only the lower punch lowering track 4 is shown as the lower punch driving member.

The support cylinder 2 rotatably supports the drive shaft 6 through a pair of upper and lower bearings (only the upper bearing is shown in the figure) 5 provided inside the support cylinder 2 so as to be spaced apart from each other. The lower end of the drive shaft 6 is connected to the output end of a rotary drive device (not shown). A track base 8 having a disk shape in a plan view is attached to the upper end of the drive shaft 6 via a bearing 7 so as to be rotatable in the circumferential direction. The track base 8 has a downwardly projecting portion 9 of the upper frame 1.
Is rotatably supported by a bearing 10. Therefore, the upper end of the drive shaft 6 is steady by the track base 8.

An upper punch guide track 11 having a ring shape in plan view is connected to a peripheral portion of the track base 8 by a large number of bolts 12 (only one is shown) 12. An upward convex portion 13 is provided on the upper surface of the track base 8, and the convex portion 13 is provided with a slight gap between a pair of stoppers 14 (only one is shown) protruding laterally from the outer surface of the downward convex portion 9. It has entered. The track base 8 is constantly urged toward the rear side in the rotation direction of the drive shaft 6 by the force of a spring (not shown). Therefore, with this spring force, the track base 8
Is normally held stationary, and the spring force is applied to the spring force only when a force for forcibly rotating the upper punch guide track 11 acts due to an excessive increase in the frictional force between the upper punch guide track 11 and the upper punch 15. On the contrary, the upper punch guide track 11 is rotated together with the track base 8 in the range of the gap. The rotational displacement at this time is appropriately detected and used to ensure the safety of the rotary tabletting machine.

A turntable 21 that is rotated together with the drive shaft 6 is supported on an upper portion of the drive shaft 6 protruding from the support cylinder 2. The turntable 21 is formed by connecting an upper rotary body 21a and a lower rotary body 21b with a large number of bolts 22 (only one is shown). The inner peripheral portion of the upper rotating body 21a is a collar portion 6a of the drive shaft 6.
Is mounted via a ring-shaped seat 36, and the turntable 21 is passed through an upper rotor 21a and a plurality of bolts 23 (only one is shown) screwed into the collar 6a. Connected to the drive shaft 6. In FIG. 1, reference numeral 24 is a ring plate having an upright portion on its inner circumference, and 25 is an oil seal.

The upper rotary body 21a is provided with a punch guide collar 26 for guiding the up and down movement of the upper punch 15. In the lower rotary body 21b,
A punch guide collar 27 for guiding the lifting and lowering of the lower punch 3 is provided, and a die mounting collar 28 is provided between the collar 27 and the punch guide collar 26.

The upper punch guide collar 26 has an annular groove 29 which is open to the peripheral surface and is continuous in the circumferential direction. The annular groove 29 is formed to have a depth reaching the inner side of the movement trajectory of the lower punch 3 and the upper punch 15. The drive shaft 6 side from the line segment AA in FIG. 1 shows the inside of the movement locus. Therefore, the punch guide collar 26
Is the upper and lower punch support parts 26a, 26 located on both upper and lower sides of the annular groove 29.
It is formed by b. In this embodiment, the lower punch support 2
6b is formed longer than the upper punch support portion 26a.

These upper and lower punch support portions 26a, 26b have punch guide holes 3 facing each other.
0 is provided. Of course, a large number of punch guide holes 30 are provided on the same circle drawn around the drive shaft 6 at predetermined intervals corresponding to the number of the upper punches 15. The upper punch 15 is slidably penetrated through the punch guide holes 30 facing each other vertically. Incidentally, reference numeral 31 in FIG. 1 denotes a bellows-shaped upper punch dustproof cap which is attached to the lower portion of the upper punch 15 and which is expandable and contractible.

The structure of the punch guide collar 27 is substantially the same as that of the upper punch guide collar 26.
That is, the punch guide collar 27 is provided with an annular groove 32 having a depth that reaches the inner side of the movement locus while opening on the peripheral surface thereof, so that the upper and lower punch support portions 27a located on both upper and lower sides of the annular groove 32, The punch support portions 27a and 27b are provided with punch guide holes 33 facing each other. In addition, in the punch guide portion 27, the upper punch support portion
27a is provided with a powder receiving portion 34 which is lowered one step from the upper surface thereof and integrally extends outward and which has a rising edge at the peripheral edge of the tip end portion. A large number of punch guide holes 33 are provided at predetermined intervals corresponding to the number of lower punches 3. The lower punch 3 is slidably penetrated through the punch guide holes 33 which are vertically opposed to each other.

As described above, the punch guide collars 26, 27 of the turntable 21 are attached to the upper and lower punches 15,3.
Since the annular grooves 29, 32 having a depth reaching the inside of the movement locus of the rotary disk are provided, the weight of the turntable 21 can be reduced correspondingly to the volumes of these grooves 29, 32, and therefore the rotary drive device for rotating the drive shaft 6 For the drive motor used for, a motor with a small capacity can be adopted.

Moreover, by providing the annular grooves 29, 32, the upper and lower punches 1
For 5, 3, the width of the annular grooves 29, 32 (between the punch support portions 26a, 26b,
And the distance between 27a and 27b), the sliding resistance of the upper and lower punches 15 and 3 is reduced to the upper and lower punch support portions 26a, 26b and 27a located above and below the annular grooves 15 and 3, respectively. , 27b punch guide hole 30,
Only the sliding resistance at 33 can be used.

Therefore, the sliding resistance of the upper and lower punches 15 and 3 can be reduced. Therefore, the sliding resistance of the upper and lower punches 15 and 3 does not increase so much even if dust invades the sliding part or oil runs out, so wear between the upper and lower punches 15 and 3 and their guideways, etc. It also reduces the risk of galling and burning.

Despite the reduction of the sliding resistance as described above, the external force for tilting the upper and lower punches 15 and 3 at the time of passing the pressure roll at the compression position is the upper and lower punch support portions 26a separated from each other. Since it can be supported by 26b, 27a, 27b, the support function required for the punch guide collars 26, 27 is not impaired.

The same number of dies 35 as the number of punches are attached to the mortar attachment brim 28 at predetermined intervals. The punch tip of the lower punch 3 is inserted into the die 35 to form the bottom of the die hole,
The punch tip of the upper punch 15 is inserted into and removed from the die hole from above, and the powder material is compression-molded in the die 35 by the vertical movement of the upper and lower punches 15, 3.

In FIG. 1, reference numeral 41 denotes an enclosing plate which surrounds the periphery of the die mounting collar 28 and is supported by a fixing member 42, which guides the powder moving on the collar 28 to the powder receiving portion 34, Also the powder receiving part
The powder that moves on the lower punch guide collar 27 is also stored in the 34.

Reference numeral 43 in FIG. 1 denotes a dustproof cover provided over the punch support portion 26b and the upper frame 1. This cover 43
Closes the open portion of the annular groove 29, and
The member in the height range between 26b and the upper frame 1 is covered. The cover 43 has a circular shape and is attached by hooking a hooking portion 43a provided on the inner surface of the cover 43 on the upper surface of the upper punch guide track 11. In order to further enhance the dustproof effect if necessary, air is continuously supplied to the inside of the cover 43 so as to slightly increase the air pressure with respect to the pressure on the outside thereof.

A lubricating pad 44, which is impregnated with lubricating oil, is mounted in the annular groove 29 at least at one location on the inner surface of the cover 43. The pad 44 contacts the peripheral surface of the upper punch 15 to supply lubricating oil, and the lubricating pad 44 is covered.
Lubricating oil is appropriately replenished through a lubricator 45 that penetrates through 43.

Reference numeral 46 in FIG. 1 is also a dustproof cover, which is attached to the fixing member 42 by closing the opening of the annular groove 32 of the punch guide collar 27. The fixing member 42 is also provided with at least one lubricating pad 47 for supplying lubricating oil to the lower punch 3 and a lubricator 48 for supplying lubricating oil to the lubricating pad 47.

As described above, the covers 43 and 46 block the open portions of the annular grooves 29 and 32, respectively, so that dust enters from the annular grooves 29 and 32 to the pestle sliding portion and slides the upper and lower pestle 15 and 3. It is possible to prevent an increase in resistance. Further, the covers 43 and 46 provided by closing the opening portions of the annular grooves 29 and 32 are not only dustproof, but also the lubricating pads 44 and 47 for the punches 3 and 15 have the same features as those of the punches 3 and 15 as described above. It is advantageous because it can be used as a support for parts for maintaining smooth sliding.

The present invention is not limited to the above embodiment. For example, the cover 43 may be detachably attached between the upper and lower punch support portions 26a, 26b, and the open portion of the annular groove 29 may be closed.
Similarly, the cover 46 may be detachably attached between the upper and lower punch support portions 27a and 27b to close the open portion of the annular groove 32.
In this case, in order to lubricate the upper and lower punches 15 and 3, it is sufficient to provide the covers 43 and 46 with a dedicated lubricating pad and lubricator for each punch.

[Effects of the Invention] In the rotary powder compression molding machine of the present invention described above, an annular groove is provided in the punch guide collar of the rotary disk, and the punch guide holes of the upper and lower punch support portions located on both the upper and lower sides of the annular groove. In addition, since the punch is slidably pierced and the opening portion of the annular groove is closed by the dustproof cover, the sliding resistance of the punch and the increase in the sliding resistance of the punch due to dust can be reduced, and The turntable can be made lighter.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an essential part of a rotary tableting machine according to an embodiment of the present invention. 3 ... Lower pestle, 15 ... Upper pestle, 21 ... Rotating plate, 26, 27 ... Punch guide collar, 2
6a, 26b, 27a, 27b ... punch support part, 29, 32 ... annular groove, 30, 33 ... punch guide hole, 43, 46 ... cover.

Claims (1)

[Scope of utility model registration request] 1. A rotary powder compression molding machine in which a punch guide collar provided on a rotary disk is provided with a plurality of punches slidably penetrating the punch guide holes of the collar, and the punch guide collar is opened to the peripheral surface of the punch guide collar. An annular groove that is continuous in the circumferential direction with the punch guide collar and has a depth that reaches the inside of the movement path of the punch is provided in the punch guide collar, and upper and lower punch support portions that form the punch guide collar on the upper and lower sides of the annular groove. And the punch guide holes are provided in these punch support portions so as to face each other, the punch guide holes are provided in the punch guide holes of the upper and lower punch support portions, respectively, and the punch guide holes are slidably provided. A rotary powder compression molding machine characterized by being provided with a dustproof cover that closes the opening.