JP2519875B2 - 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 disposed through a vertical shaft in a frame, and a plurality of mortars are mounted on the rotary disk. Is provided at a predetermined pitch, and the upper and lower punches are held above and below each die so that they can slide up and down, and the upper and lower punches with the tips of the punches inserted into the die are the upper and lower rolls. It is known that the powder filled in the die is compression-molded by guiding the powder to the space and forcibly passing it.

Conventionally, in such a molding machine,
Generally, the support shaft of each of the lower rolls is supported by the frame via a pair of bearings, and the upper and lower rolls are generally mounted on the parts of the support shaft located between the bearings.

[0004]

By the way, in this type of rotary powder compression molding machine, the base end of the punch is repeatedly in strong line contact with the outer peripheral surface of the roll during molding, so that wear of the roll is avoided. I can't. Therefore, it is necessary to remove the roll from the frame of the molding machine and replace it with a new one, but in the above-mentioned conventional one, it is essential to also remove the support shaft supporting this roll when replacing the roll. However, there is a problem in that much labor is required for disassembly and assembly. For example, when exchanging the upper roll, the present situation is to remove the tongue of the upper frame from the apparatus main body and pull out the support shaft supported by the upper frame to replace the upper roll.

If there are bearings on both sides of the roll,
The outer bearing and the frame supporting the bearing make it difficult to visually recognize the roll from the outside, which causes problems in cleaning and inspecting the roll.

In order to facilitate cleaning and inspection of the roll, it is conceivable that the support shaft has a cantilevered support structure. In the case of a cantilevered support shaft, the support shaft itself is rotatably mounted on the frame. It was difficult to install, which made it difficult to install a shock absorber, tableting thickness adjuster or pressure detector.

The purpose of the present application is to eliminate such a problem.

[0008]

The present application takes the following means in order to achieve such an object. That is, in the rotary powder compression molding machine according to claim 1 of the present application, a rotary disk is disposed so as to be horizontally rotatable via a vertical shaft, and a plurality of dies are provided at a predetermined pitch on the rotary disk, and each mortar is provided. The upper and lower punches were held vertically slidably, and the upper and lower punches with the tips of the punches inserted into the die were filled in the die by passing between the upper roll and the lower roll. In a rotary powder compression molding machine adapted to compress powder, a supporting shaft is supported by an upper frame with its open end facing outward, and an eccentric sleeve is rotatably mounted on the supporting shaft. The upper roll is rotatably and detachably mounted on the eccentric sleeve.

Further, in the rotary type powder compression molding machine according to claim 2 of the present application, the rotary disk is disposed so as to be horizontally rotatable via the vertical shaft, and the rotary disk is provided with a plurality of mortars at a predetermined pitch. , The upper and lower punches are held above and below each die so that they can slide up and down, and the upper and lower punches with the tips of the punches inserted into the die are passed between the upper roll and the lower roll In a rotary powder compression molding machine that compresses powder filled in, the lower frame cantilever-supports the support shaft with its open end facing outward, and the support shaft can rotate the eccentric sleeve. The outer roll is rotatably and detachably mounted on the eccentric sleeve.

[0010]

In the invention according to claims 1 and 2 of the present application, since the support shaft is supported by the frame in a cantilever manner and the open end thereof is directed outward, each roll can be easily attached and detached from the outside. It will be possible. That is, when the roll is attached and detached, unlike the case where the support shaft is supported by the bearings at both ends thereof, the support shaft is supported only on one end thereof on the frame side. Therefore, the remaining end of the support shaft can be in an outwardly open state, that is, a state where there is no restraint by the bearing, and the roll keeps the support shaft supported by the frame.
It will be attached and detached from the open end side. Therefore, when replacing a roll that needs to be replaced, it is not necessary to remove the support shaft, which facilitates the replacement work.
It can reduce labor and time.

Further, since the eccentric sleeve is rotatably mounted on the support shaft and the roll is rotatably and detachably mounted on the eccentric sleeve, the eccentric sleeve is substantially rotated with respect to the roll. It becomes a movable rotary shaft, and by utilizing the movement of the eccentric sleeve, it becomes possible to attach a shock absorber, a tableting thickness adjusting device, and a pressure detecting device.

[0012]

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

FIG. 1 shows a rotary powder compression molding machine 1 according to the present invention.
The overall configuration of 00 is shown.

In this rotary powder compression molding machine 100, a rotary disk 3 is arranged in a frame 1 so as to be horizontally rotatable via a vertical shaft 2, and a plurality of dies 4 are provided on the rotary disk 3 at a predetermined pitch. At the same time, an upper punch 5 and a lower punch 6 are held above and below each die 4 so as to be vertically slidable. Then, with the tips of the upper punch 5 and the lower punch 6 inserted into the die 4, first,
It is passed between an upper roll 81 for pre-compression and a lower roll (not shown), and then an upper roll 82 for main compression.
The powder filled in the mortar 4 can be compression-molded by passing the powder between the lower roll 92 and the lower roll 92. A powder filling mechanism 7 for filling the powder in the mortar 4 is attached from above the rotary disc 3 toward the rotary disc 3.

A vertical shaft 2 supported by a bearing 21 is arranged at substantially the center of the frame 1, and a worm wheel 22 is fixed near the lower end of the vertical shaft 2 and is attached to the worm wheel 22. The rotational driving force of the motor 25 is transmitted via the worm 23 and the belt 24. A turntable 3 which is divided into three functional parts is fixed near the upper end of the vertical shaft 2. 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 3
2, and a mortar portion provided between the upper pestle holding portion 32 and the lower pestle holding portion 31 and provided with a plurality of mortar mounting holes for detachably fitting the mortar 4 on the same circumference. And 33. The upper punch holding part 32 and the lower punch holding part 31 are the upper punch 5
Also, a plurality of punch holding holes for slidably holding the lower punch 6 are provided. In this turntable 3, the lower punch 6
The upper punch 5 and the mortar 4 are provided with punch-holding holes and mortar mounting holes, respectively, so that the centers thereof are located on the same straight line in the vertical direction.

The upper punch 5 held on the turntable 3 is guided to the highest position in the vicinity of the powder filling mechanism 7 by the guide rail 51 attached near the upper end of the upright shaft 2, and is guided to the upper rolls 81 and 82. At the reaching position, the upper rolls 81 and 82 are guided to a lower position where they enter below. Further, the lower punch 6 is moved up and down by the lowering device 61 provided on the lower side of the turntable 3, and after the compression by the lower roll 92 is completed, the molded product formed by the compression is moved to the die 4
You will be guided to the highest position when you take it out from.

An upper roll 81 and a lower roll for pre-compression, and an upper roll 82 and a lower roll 92 for main compression are respectively paired up and down, and are arranged in the horizontal direction in FIG. 3 (upper roll 81, 82 only), as shown in FIG.
Upper and lower rolls 82 and 92 for main compression are, for example, 6
It is arranged with an angle of 7 degrees.

An upper roll 81 for preliminary compression and for main compression,
Reference numeral 82 denotes a shaft eccentric with respect to the shaft center of the support shaft AX, which is fixed to a support shaft AX fixed to the upper frame 11 constituting the upper portion of the frame 1 so that the shaft center is horizontal and protrudes outward. A cylindrical eccentric sleeve ES having an outer peripheral surface centered on the center is used as a pair of bearings, that is, a first bearing RBa.
Further, the eccentric sleeve ES is rotatably mounted via the second bearing RBb, and the upper rolls 81, 82 are rotatably and detachably mounted on the eccentric sleeve ES via the third bearing RBc. That is, the upper rolls 81 and 82 are eccentric sleeves E.
The support shaft AX that is externally mounted via S has a diameter larger than the shaft diameter of the lower roll 92, and has, for example, a length that is approximately twice the thickness of the upper rolls 81 and 82, and is located on the upper frame 11 side. A flange AXb is integrally provided near one end AXa, and a male screw portion AXd is formed at the open end AXc portion which is the other end. Plural mounting holes are formed in the flange AXb in the circumferential direction for inserting the fixing bolts FB. The support shaft AX has its one end AXa fitted to the upper frame 11, and the inward surface of the flange AXb is closely fixed to the upper frame 11, and the male screw portion AXd is supported by the upper frame 11. The cantilever support structure is opened without being subjected to the operation, and only the one end AXa having the flange AXb is supported.

More specifically, the eccentric sleeve ES is rotatably mounted on the support shaft AX via the first bearing RBa and the second bearing RBb of the upper rolls 81 and 82. One side surface of the first bearing RBa has a flange AX.
It is attached so as to be in close contact with b and the other side thereof in close contact with the first sleeve Sa and the eccentric sleeve ES. The second bearing RBb has a nut NTa whose one side is closely attached to the first sleeve Sa and the eccentric sleeve ES, and the other side is screwed to the male screw portion AXd.
It is pressed and attached by. Upper roll 81,
82 is mounted on the eccentric sleeve ES via the third bearing RBc. The third bearing RBc is held by the second roll Sb fixed to the outer surface of the upper roll 81, 82 by the bolt B and the upper roll 81, 82. Further, the rotating arm AM for transmitting an abnormal load applied to the upper roll 82 to the shock absorber 40 described later is a nut N.
It is held between Tb and the third bearing RBc, and the key KY
It is fixed to the outer circumference of the eccentric sleeve ES in a state where the rotation is prohibited by. Note that W is an inspection window that can be opened and closed.

The shock absorber 40 is attached to each of the upper rolls 81 and 82 via the rotating arm AM as shown in FIG. The shock absorber 40 is inserted into a through hole 41 provided at the free end of the rotating arm AM to convert the rotation of the rotating arm AM into an advancing / retreating operation and can be moved up and down. An advancing / retreating shaft 43 held at the movement limit position, and a collar portion 44 fixed to the outer periphery of the advancing / retreating shaft 43 at a substantially central position in the axial direction,
The forward / backward movement shaft 43 is supported by a screw portion 45 formed on the outer circumference of the forward / backward movement shaft 43 above the flange portion 44, and a spring receiver 46 having an upper end supported by the flange portion 44 and a lower end fixed to the upper frame 11. A spring 42 that is wound around the spring 42 and constantly urges the advancing / retreating shaft 43 upward in the axial center; The handle 49 is integrally formed on the upper end of the support member 48 and is capable of moving the advancing / retreating shaft 43 in the vertical direction by rotating the support member 48.

The lower roll 92 for main compression is provided with the support shaft 9
3 is rotatably externally fitted to an eccentric portion 96 which is eccentric in the counter-rotational direction of the turntable 3 in the horizontal direction from the axis of the support shaft 93 located between the bearings. Supported on the bottom of the frame 1. Further, with the same mounting structure as the lower roll 92 for main compression, the lower roll for preliminary compression is arranged directly below the upper roll 81 for preliminary compression.

In such a structure, when an abnormal load is applied to the upper roll 82 for main compression by impact during tableting, the eccentric sleeve ES of the support shaft AX is rotatably fitted to the exterior. The upper roll 82 for main compression also rotates about the axis of the eccentric sleeve ES by this impact, and the eccentric sleeve ES also rotates together with this. As a result, the rotating arm AM attached to the eccentric sleeve ES
The free end of the shaft rotates downward, the collar portion 44 is pushed downward, and the advancing / retreating shaft 43 is urged downward against the urging force of the spring 42. By compressing the spring 42, the upper end of which is supported by the collar portion 44 and the lower end of which is supported by the spring receiver 46, an abnormal impact generated during tableting is buffered. In this way, after absorbing the abnormal impact, the advancing / retreating shaft 43 is urged by the upward urging force of the axial center of the spring 42 and returns to the predetermined movement limit position. AM also returns to a predetermined position. In the shock absorber 40, the forward / backward shaft 43 can be moved in the vertical direction by rotating the handle 49 manually or by a motor or the like. Therefore,
The stop position of the collar portion 44 can be finely adjusted, and the setting of the abnormal compressive force for buffering can be precisely adjusted.

With such a construction, the upper rolls 81 and 82 are slidable by inserting the upper rolls 81 and 82 from the open end AXc side into the support shaft AX attached to the upper frame 11. Since the upper rolls 81 and 82 can be supported by, the work of attaching and detaching the upper rolls 81 and 82 is facilitated, and the assembly and replacement steps can be shortened. Further, on the open end AXc side of the support shaft AX facing the inspection window W, a nut N having an outer diameter smaller than the bearing outer diameter is provided.
Since there are only T, the eccentric sleeve ES, the rotating arm AM, and the first and second sleeves Sa and Sb, there is nothing that blocks the view from the inspection window W side to the upper rolls 81 and 82 side. The rolls 81 and 82 can be seen very well, and the visual inspection accuracy can be improved.

The present invention is not limited to the embodiment described above. For example, although the shock absorber 40 is connected to the rotary arm AM in the above embodiment, a pressure detector for converting the pressure of the punch into an electric signal may be provided with a load cell or the like.

In the above embodiment, the upper rolls 81, 82 for pre-compression and for main compression have been described with the attachment structure using the support shaft AX having one end open. It may be applied to the mounting structure of the lower roll 92 for main compression. In the case of the lower roll 92, its height is adjusted in order to adjust the compression force. Therefore, the height adjusting mechanism is connected to the rotating arm AM fixed to the eccentric sleeve ES, and the height of the free end of the rotating arm AM is increased. The eccentric sleeve ES may be rotated by adjusting the height of the lower roll 92 so that the mounting height of the lower roll 92 can be precisely adjusted.

The configuration of each part is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0027]

As described in detail above, the inventions according to claims 1 and 2 of the present invention respectively include the support shaft of the roll,
The frame has a cantilever structure with its open end facing outward, so the state of the roll attached to the spindle can be clearly seen from the outside, and moreover, the roll can be attached without removing the spindle from the frame. The removal work can be performed, the roll inspection and replacement work can be facilitated, and the labor and the work time can be reduced at the same time. Furthermore, since an eccentric sleeve whose axis is eccentric with respect to the axis of the support shaft is provided, an arm is fixed to the sleeve, and a shock absorber, a tableting thickness adjusting device, and a pressure detecting device are provided via the arm. It becomes possible to attach a shock absorber, a tableting thickness adjusting device, and a pressure detecting device without using a large-scale device.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a rotary powder compression molding machine showing an embodiment of the present invention.

FIG. 2 is a front sectional view showing an enlarged main part of the embodiment.

3 is an end view of the same embodiment taken along the line AA in FIG. 2. FIG.

FIG. 4 is a side sectional view showing the main part in an enlarged manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Vertical shaft 3 ... Rotating plate 4 ... Mortar 5 ... Upper punch 6 ... Lower punch 11 ... Upper frame 81, 82 ... Upper roll 92 ... Lower roll 100 ... Rotary powder compression molding machine AX ... Spindle AXc ... Open end ES ... Eccentric sleeve

Claims (2)

(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. Rotating powder compression that holds the powder as much as possible and compresses the powder filled in the die by passing the upper and lower punches with the tips inserted into the die between the upper roll and the lower roll. In a molding machine, a support shaft is supported by an upper frame with its open end facing outward, and an eccentric sleeve is rotatably mounted on the support shaft, and the upper roll can be rotated by the eccentric sleeve. A rotary powder compression molding machine characterized by being externally and detachably mounted. 2. 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 an upper pestle and a lower pestle are vertically slid above and below each mortar. Rotating powder compression that holds the powder as much as possible and compresses the powder filled in the die by passing the upper and lower punches with the tips inserted into the die between the upper roll and the lower roll. In a molding machine, a lower frame is supported by a supporting shaft with its open end facing outward, and an eccentric sleeve is rotatably mounted on the supporting shaft, and the lower roll can be rotated by the eccentric sleeve. A rotary powder compression molding machine characterized by being externally and detachably mounted.