JP2500196B2 - Rotary powder compression molding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary powder compression molding machine for compressing powder to mold tablets and the like.

[0002]

2. Description of the Related Art As a rotary powder compression molding machine for molding tablets, electronic parts, etc., a rotary disk is horizontally rotatably arranged via a vertical shaft, and a plurality of dies are arranged on the rotary disk at a predetermined pitch. It is known that an upper punch and a lower punch are slidably held above and below each die. Then, the powder compression molding machine of this kind, with the powder punching part for pulling the upper punch out from the die and lowering the lower punch by the lowering device to introduce the powder supplied on the rotating disk into the die by the feed shoe, A powder rail is used to remove the powder that has overflowed from the die due to the lifting of the lower punch to the specified position and the powder that has overflowed from the die, and the upper punch and the lower punch. It is equipped with a compression molding unit that guides the punch between the upper and lower rolls to compress and mold the powder in the die, and a product extraction unit that pulls out the upper punch from the die and raises the lower punch to take out the product in the die. What is common is.

[0003]

By the way, in this type of rotary powder compression molding machine, the height position of the weighing rail is adjusted so that the height position of the weighing rail is adjusted so that products having various thickness dimensions can be molded. It can be changed by.

However, in the case of only this, the sliding amount of powder greatly varies depending on the product, that is, in such a structure, the lower punch is once lowered by a lowering device by a certain height. After that, the product is raised to the position of the quantity rail set to the height corresponding to the product, and at the time of that rise, the powder pushed out of the die is scraped off to leave a predetermined amount of powder in the die. Therefore, when molding a product having a large thickness, the amount of sliding cut becomes small, and conversely, when molding a thin product, the amount of sliding cut becomes large. The scraped powder is collected near the inner circumference of the rotating disk, circulates, and is supplied to the feed shoe again.However, if the scraped amount varies, the piled-up amount of powder in the feed shoe installation part will fluctuate. The density of the powder filled in the die changes. As a result, there is a problem that the weight of the product unexpectedly changes.

In order to cope with such a problem, conventionally, a plurality of types of lowering devices having different lowering amounts are prepared, and the lowering device corresponding to the set height position of the quantity rail is selected and attached. There are a lot of things. However, as the variation in the packing density of the powder is reduced, more kinds of lowering devices are required, and it is troublesome that the lowering device having a large weight has to be replaced every time the setting is changed. .

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

[0007]

The present invention takes the following means in order to achieve such an object.
That is, in the rotary powder compression molding machine according to the present invention, a rotary disk is disposed so as to be horizontally rotatable via a vertical shaft, and a plurality of dies are provided on the rotary disk at a predetermined pitch, and the dies are provided above and below each mortar. The upper pestle and the lower pestle are held so that they can slide up and down, and the lower pestle is lowered by a lowering device to introduce the powder supplied onto the rotating disk into the die by the feed shoe, and the weighing rail. The lower punch is moved up to a predetermined position and the powder sliding section for removing the powder overflowing from the die by the raising of the lower punch and the upper punch are inserted into the die and the upper punch and the lower punch are inserted. It is provided with a compression molding section for guiding between the upper and lower rolls to compress and mold the powder in the die, and a product extraction section for extracting the upper punch from the die and raising the lower punch to take out the product in the die. At least a portion of the reducer is In conjunction with the lifting operation, characterized by being configured so as to lift it.

As a concrete form of the lowering device, there is a lowering device which is attached to a fixed member and a lower half of the lowering device which is attached to an elevating member for holding a quantity rail. it can. In order to prevent the lower punch from falling in such a structure, the lower punch is prevented from falling by lowering the lower half of the lowering device by pivotally attaching one end to the fixing member and abutting the other end to the elevating member. It is better to arrange the bottom rail of.

[0009]

With such a structure, at least a part of the lowering device moves up and down steplessly in conjunction with the position adjusting operation of the quantity rail. Therefore, without changing the lowering device, or Even in the case of replacement, it is possible to significantly reduce the replacement frequency and prevent the sliding amount from fluctuating significantly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rotary powder compression molding machine A according to the present invention.
Shows the overall configuration of. This rotary powder compression molding machine A
In the frame 1, a turntable 3 is horizontally rotatably disposed via a vertical shaft 2, a plurality of dies 4 are provided on the turntable 3 at a predetermined pitch, and upper and lower punches 5 are provided above and below each mortar 4. Also, the lower punch 6 is held so as to be slidable up and down.

More specifically, a vertical shaft 2 supported by a bearing 21 is arranged in the substantially central portion of the frame 1.
A worm wheel 22 is fixed near the lower end of the standing shaft 2, and the worm wheel 22 is attached to the worm wheel 22.
The rotational driving force of the motor 25 is transmitted via the motor 3 and the belt 24. And this standing shaft 2
A turntable 3 which is divided into three functional parts is fixed near the upper end of the. The turntable 3 includes a lower punch holding portion 31 which is provided in a lower portion of the turntable 3 and which holds the lower punch 6 slidably in the vertical direction, and an upper punch which is provided in an upper portion and holds the upper punch 5 slidably in the vertical direction. Holding part 32, upper punch holding part 32 and lower punch holding part 31 thereof
And a mortar portion 33 which is provided between the mortar 4 and the mortar 4 for detachably fitting the mortar 4 and is provided on the same circumference. Upper punch holding part 32 and lower punch holding part 31
Has a plurality of punch holding holes for slidably holding the upper punch 5 and the lower punch 6, respectively. In this turntable 3, the lower punch 6, the upper punch 5, and the die 4 are provided with punch-holding holes and die-mounting holes, respectively, so that the centers of the lower punch 6, the upper punch 5, and the die 4 are located on the same straight line. There is.

As shown in FIGS. 2 and 3, the rotary powder compression molding machine A includes a powder filling section 7, a powder sliding section 8, a compression molding section 9, and a product unloading section 10. Are sequentially provided along the rotation direction of the turntable 3.

The powder filling section 7 is configured such that the lower punch 6 is lowered by the lowering device 71 and the powder P supplied onto the rotating disk 3 is introduced into the die 4 by the feed shoe 72.
The powder P is supplied to the rotating disk 3 by the powder supply mechanism 73. As shown in FIG. 4, the lowering device 71 includes a lowering device front half portion 75 attached to a fixing member 74 and a lowering device rear half portion 77 attached to a lifting / lowering member 76 for holding a quantity rail.
The height of the lift table 76 can be changed by a quantity rail lift mechanism 81 described later. Below the lower part of the lowering unit 77,
A bottom rail 78 for preventing the lower punch from falling is provided. The bottom rail 78 is provided on a rotating arm. One end 78a of the bottom rail 78 is pivotally attached to the bracket 74a of the fixing member 74 and the other end 78 is provided.
b is brought into contact with the bottom surface of the concave groove 77a provided in the lower half portion 77 of the lowering device, and can be rotated up and down as the lower half portion 77 of the lowering device 77 moves up and down.

The powder sliding section 8 raises the lower punch 6 to a predetermined position by the quantity rail 82, and the powder P overflowing from the inside of the die 4 by the raising of the lower punch 6 is slid on the mill 4 by the sliding cutting plates 83 and 84. The quantity rail 82 is attached to the lifting member 76 which is lifted and lowered by the quantity rail lifting mechanism 81. Quantity rail lifting mechanism 81
Is a pair of drive mechanisms 81b that decelerates the rotational power of a motor (not shown) by a worm gear or the like and outputs it from the output shaft 81a, a feed screw 81c provided on the upper end of the output shafts 81a of both drive mechanisms 81b, and It is provided with a nut member 81d that is fixed to the lower surface of the elevating member 76 and is screwed into each of the feed screws 81c, and a fixed holder 81e that encloses these nut members 81d in a vertically slidable manner.
Each of the fixed holders 81e is fixed to the shaft case base 12. Reference numeral 81f is a shaft vertically extending from a required position on the lower surface of the elevating member 76. The shaft 81f is slidably guided by a guide sleeve 13 fixed to the shaft case base 12, so that the elevating member 76 is straightened. So that it can be raised and lowered. The quantity rail 82 includes a quantity rail front half portion 82b having a slight upward slope 82a on the start end side and a quantity rail rear half portion 82d having only a horizontal surface 82c. A quantity parallel rail 85 is interposed between the end of the lower half portion 77 of the lowering device and the start end of the quantity rail 81.

The compression molding part 9 guides the upper punch 5 to the guide rail 14
Down along the descending inclined surface 14a of the
The upper punch lowering safety cam 91 for inserting into the inside and the upper punch 5 and the lower punch 6 with the tips of the punches inserted into the die 4 are restrained from above and below to preliminarily compress the powder P in the die 4. Lower pre-compression rolls 92 and 93, upper punch 5 and lower punch 6 are constrained from above and below to fully compress powder P in die 4, and lower main compression rolls 94 and 95 are provided. It has the same structure as the conventional one.

The product take-out section 10 has a rising slope 14b of a guide rail 14 for raising the upper punch 5 and pulling it out from the die 4,
A push-up roll 101 that urges the lower punch 6 upward to move the product Q in the die 4 upward by a required amount, and a lower punch 6 is guided further upward to push the product Q completely out of the die 4. The push-up rails 102 and 103 and the guide plate 105 that guides the extruded product Q laterally and guides it to the chute 104 have the same configuration as the conventional one.

Next, the operation of this compression molding machine will be described. The lower punch 6 at the stage of passing the product take-out section 10 is held at the highest position. When the lower punch 6 is moved to the powder filling section 7 by the rotation of the turntable 3, the lower punch 6 is first lowered to the middle position by the guiding action of the lowering unit first half portion 75, and is guided by the lowering unit second half portion 77. It is pulled down to a lower position. On the way,
The powder P supplied from the powder supply mechanism 73 onto the rotary disk 3 is uniformly introduced by the powder guiding action of the feed shoe 72. Then, when the lower punch 6 rides on the quantity rail 82, the lower punch 6 is slightly lifted to reach a predetermined height position, and the mortar 4 is filled with the set amount of powder P. By passing through the slide-cutting plates 83 and 84 in this state, the powder P overflowing onto the mortar 4 is cut off and collected near the center of the rotary disk 3. Then, the upper punch 5
And the tip of the punch is inserted into the die 4, and the upper punch 5
And the lower pestle 6 between the upper and lower pre-compression rollers 92 and 93, and
The powder P in the die 4 is compression-molded by passing between the upper and lower main compression rollers 94 and 95. After the molding, the upper punch 5 is first lifted and pulled out from the die 4 in the product take-out portion 10, and then the lower punch 6 is pushed up by the push-up roller 101 and the push-up rails 102 and 103 to produce the product Q in the die 4.
Are extruded onto the turntable 3. And the product Q is
It is guided onto the chute 104 by the guiding action of the guide plate 105 and led out of the compression molding machine A.

As described above, the predetermined product Q can be manufactured by repeatedly and continuously compressing and molding the powder P. However, when the specification of the product Q is changed, the quantity rail lifting mechanism 81 is used. Is operated to change the height of the quantity rail 82. Specifically, when the paired drive mechanisms 81b are operated synchronously, both feed screws 81c rotate at the same speed, and the nut member 81 screwed to these both feed screws 81c.
d goes up and down. Therefore, the elevating member 76 fixed to these nut members 81d moves up and down while maintaining the horizontal state, and the height position of the quantity rail 82 is changed. Moreover, unlike the conventional one, when the elevating member 76 is moved up and down and the height position of the quantity rail 82 is changed, the height position of the lower part of the lowering unit 77 attached to the elevating member 76 is also changed. It will be changed. Therefore, the height position of the lower punch 6 at the stage of passing the end of the lowering device 71 and the lower punch 6 at the stage of reaching the horizontal portion 82c of the quantity rail 82.
The difference from the height position always corresponds to the height difference of the ascending slope 82a of the quantity rail 82, and is always constant. Therefore, even if the height position of the quantity rail 82 is variously changed, the amount of the powder P that has been introduced into the mortar 4 and then pushed back to the outside of the mortar 4 and slid off is always the same. Therefore,
It is possible to maintain a constant sliding amount without changing and using various kinds of lowering devices having different sizes and to effectively suppress variations in product weight and the like.

By the way, in this embodiment, the amount of sliding can be accurately kept constant only when the height position of the weighing rail 82 is changed within the range of the drop of the lower half 75 of the lowering device. However, even if the adjustment is further performed, a large error does not occur. If it is desired to eliminate this error as well, only in the case of making such an extreme specification change, it is sufficient to replace the first half of the lowering unit with a different head.
Incidentally, FIG. 4 shows the case where the quantity rail 82 is set to the lowest position, and FIG. 5 shows the highest position where the sliding amount can be maintained constant without replacing the lower part 75 of the lowering device. It shows a state in which the quantity rail 82 has been raised. Then, a shows the punch tip locus of the lower punch 4 when set to the position of FIG. 4, and b shows the punch tip locus of the lower punch when set to the position of FIG.

In this embodiment, the lower rail 6 is also provided in the lower half portion 77 of the lowering device 6 which moves up and down.
Can be prevented from falling. Moreover,
Since the bottom rail 78 tilts as the lower portion of the lowering device 77 moves up and down, the bottom rail 78 does not interfere with the raising and lowering operations of the lower portion of the lowering device 77 and the lower punch guiding operation.

The present invention is not limited to the above-described embodiment, and for example, the entire lowering device may be moved up and down corresponding to the quantity rail.

In addition, various modifications can be made without departing from the spirit of the present invention.

[0024]

Since the present invention has the structure described above, the sliding amount can be maintained substantially constant even if the height position of the quantity rail is changed without replacing the lowering device.
Therefore, from thick products to thin products,
It is possible to provide a rotary powder compression molding machine capable of manufacturing various specifications without time-consuming and quality deterioration.

[Brief description of drawings]

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

FIG. 2 is a schematic plan view showing the top of a turntable of the embodiment.

FIG. 3 is a front cross-sectional view showing a developed rotary disc of the embodiment.

FIG. 4 is a front cross-sectional view showing an enlarged main part of the embodiment.

FIG. 5 is an operation explanatory view of the same embodiment.

[Explanation of symbols]

 2 ... Vertical shaft 3 ... Rotating plate 4 ... Mill 5 ... Upper punch 6 ... Lower punch 7 ... Powder filling part 8 ... Powder scraping part 9 ... Compression molding part 10 ... Product ejection part 71 ... Dropper 72 ... Feed shoe 74 ... Fixed member 75 ... Lower part of lowering device 76 ... Elevating member 77 ... Lower part of lowering device 81 ... Quantity rail lifting mechanism 82 ... Quantity rail 83 ... Sliding plate 84 ... Sliding plate 91 ... Precompression roll 92 ... Precompression roll 93 ... Main compression roll 94 ... Main compression roll

Claims (3)

(57) [Claims] 1. A rotary disk is horizontally rotatably arranged via a vertical shaft, and a plurality of dies are provided on the rotary disk at a predetermined pitch, and upper and lower punches are vertically slid above and below each mortar. It is a rotary compression molding machine that can be held as much as possible.The lower punch is lowered by a lowering device and the powder supplied on the rotating disc is introduced into the die by a feed shoe. When the punch is raised to a predetermined position and the lower punch is raised, the powder sliding section that removes the powder overflowing from the die from the die and the upper punch are inserted into the die and the upper punch and the lower punch are raised. , Which comprises a compression molding section for guiding between the lower rolls to compress and mold the powder in the die and a product extraction section for extracting the upper punch from the die and raising the lower punch to take out the product in the die , At least a part of the lowering device, lifting and lowering of the quantity rail Rotary compression molding machine, characterized by being configured so as to ascend and descend in conjunction with the. 2. The lowering device comprises a lowering part of the lowering device attached to a fixed member and a second half of the lowering device attached to an elevating member for holding a quantity rail. Rotary powder compression molding machine. 3. A bottom rod for preventing lower punch drop, wherein one end is pivotally attached to the fixing member and the other end is brought into contact with the elevating member below the lower half of the lowering device. Claim 2
The rotary powder compression molding machine described.