JPH11197891A - Rotary powder compression molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate attaching and detaching of the feeder part and to prevent powder materials inside the powder feeder from sticking to the transmission mechanism that transmits a driving force to stirring blades inside the feeder. SOLUTION: The rotary tablet machine is equipped with a powder feeding device 71 which stirs powder materials with plural stirring blades 76 and which supplies the materials into a mortar 65 of a rotary table 61. The driving motor 101 of the device 71 is arranged on the upper frame 23 above the powder feeder body 75 of the device 71, as well as the transmission mechanism 102 linked with this motor. The transmission mechanism is provided with a driving shaft 107, 108, which corresponds to each of the stirring blades, projecting to the feeder body 75. A driven shaft 83, 84 supporting each stirring blade is projected from the feeder body 75 to the driving shaft correspondingly. The driving shaft and the driven shaft facing oppositely are connected by a retractable shaft connecting means 74 so that the removing of the feeder body 75 is not interfered with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying a powder material from a powder supply device having a plurality of stirring blades into a mortar mounted on a turntable, and compressing the powder material in the mortar to form tablets or the like. The present invention relates to a rotary powder compression molding machine such as a rotary tableting machine for molding.

[0002]

2. Description of the Related Art In a rotary powder compression molding machine, a rotating disk on which a plurality of dies are mounted is rotated by a driving device, and the rotating disk is slidably movable in a vertical direction corresponding to each die. The attached upper punch and lower punch are moved up and down by cam means for these to perform a predetermined compression molding operation. Then, the powder material is supplied into the mortar by a powder feeder commonly called a DP feeder, that is, the powder material is caused to flow while being stirred by the rotation of the stirring blade in the powder feeder, and the powder material is fed into the mortar. An agitated supply type is used. This powder supply apparatus is excellent in that the supply density of the powder material into the mortar can be made constant because the powder material is supplied while flowing.

In this type of powder material supply apparatus, a gear box having a built-in gear transmission mechanism is connected to the upper surface of an upper lid of a powder supply body which is disposed slightly in contact with the upper surface of a die mounting portion of a rotary disk, and a gear is provided. A stirring blade is attached to each of a plurality of drive shafts protruding from the power transmission mechanism into the powder supply body, and an input shaft connected to any gear of the gear transmission mechanism is driven by the power of the drive motor. Have. A powder material supply port communicating with an upper material hopper is provided on one end side of the powder supply device body, and a powder supply port opened to the upper surface of the die mounting portion is provided on the other end side. ing.

[0004] Therefore, in this powder supply device, each of the stirring blades is rotated in the powder supply body as the gear transmission mechanism is driven via the input shaft by the power of the drive motor. The powder material can be caused to flow from the powder supply port side to the powder supply port side while being stirred by the stirring blades. Thus, when the mortar faces the powder supply port with the rotation of the turntable, the powder material can be supplied from the supply port into the mortar hole.

[0005]

In a rotary powder compression molding machine for producing tablets and the like, disassembly and cleaning are performed quite frequently, and each time the powder feeder unit (feeder unit) of the powder feeder is also used as described above. The connection with the drive motor is released, and it is detached. By the way, the weight of the gear box occupies about 30% of the total weight of the feeder portion to be detached and attached, and not only the gear box and the gear transmission mechanism but also the powder feeder body and the stirring blade are usually made of metal. Is formed.

For this reason, since the gear box is integrally connected to the upper lid of the powder feeder as described above, in the powder feeder which needs to be removed together with the box, the weight of the feeder portion is reduced. However, there is a problem that the attachment and detachment work is heavy. Because of the heavy weight of the feeder, the operator can pinch his / her finger between the turntable and the like, slide the hand to drop the feeder, and need a large amount of arm force. There is a high risk of being scratched by hitting, and improvement has been desired.

In view of the above, attempts have been made to reduce the weight of the gear transmission mechanism by using a resin gear or by reducing the thickness of the gear box or the like, but it has not been possible to achieve a significant reduction in weight. Moreover, it has been confirmed that the resin gear has a problem of low durability, and no practical countermeasure has been realized yet.

Further, in the configuration in which the gear box is connected to the upper surface of the powder supply body, there is a high possibility that the powder agitated in the powder supply body enters the gear box. There is a problem that it takes time to clean the mechanism.

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is that the feeder unit can be easily attached and detached, and the powder material in the powder feeder adheres to the transmission mechanism for transmitting the driving force to the stirring blade in the feeder unit. The object of the present invention is to obtain a rotary-type powder compression molding machine without any.

[0010]

According to the present invention, there is provided a powder supply device for supplying a powder material into a die mounted on a turntable, and the supply device accommodates a plurality of rotationally driven stirring blades. The powder material to be supplied to the powder supply unit is supplied while being stirred by the stirring blades to supply the powder material from the powder supply unit into the die. It is assumed that a rotary powder compression molding machine compresses the powdered material with an upper punch and a lower punch which are moved up and down according to the rotation of the turntable.

According to another aspect of the present invention, there is provided a feeder unit having the powder supply device having the stirring blades and the powder supply unit housing the stirring blades, a drive motor, and a motor. A drive unit having a transmission mechanism interlocked with the drive unit disposed above or below the feeder unit and a plurality of drive shafts protruding from the transmission mechanism corresponding to each of the stirring blades. And a shaft connecting means for individually supporting each of the stirring blades and detachably connecting to a plurality of driven shafts protruding from the powder supply unit.

According to the first aspect of the present invention, the power of the drive unit having the drive motor and the transmission mechanism is individually transmitted from the drive shaft to the driven shaft supporting each of the stirring blades via the shaft connecting means. By rotating each stirring blade, the powder material in the powder supply unit can be stirred. Since the driving unit is separated from the powder supply unit and the feeder unit having the stirring blades therein and disposed above or below the feeder unit, the powder material stirred in the powder supply unit as described above. Does not enter the drive unit and adhere to the transmission mechanism. Further, when disassembling and cleaning the rotary powder compression molding machine, the shaft connecting means is operated to separate the drive shaft and the driven shaft so that the feeder unit can be removed from the turntable. The part can be removed for disassembly and cleaning. In such disassembly cleaning and the like, it is not necessary to remove the drive unit, and only the feeder unit needs to be attached and detached, so that the weight of the detachable feeder unit can be significantly reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view schematically showing a configuration of a main part of a rotary tableting machine for producing tablets as an example of a rotary powder compression molding machine. The fixed main body frame 21 shown in FIG.
2, an upper frame 23 disposed above the upper frame 23, and four (only two of them are shown) frame columns 24 connecting the four corners of the upper and lower frames 22, 23, respectively.

The lower frame 22 has a concave partition 25 protruding from the upper surface inside the lower frame 22, and an output chamber 26 is provided inside the lower partition 22 by the partition 25. The output chamber 26 is open to the upper surface at the center of the lower frame 22. A worm shaft 27 penetrating the output chamber 26 in the horizontal direction is rotatably supported on the partition wall 25 through a bearing (not shown). A worm 28 located in the output chamber 26 is provided at an intermediate portion of the shaft 27. ing.

A non-exciting operation type electromagnetic brake 32 is attached to one end of the worm shaft 27, and the rotation of the worm 28 and the like is braked by the brake 32. A horizontal power transmission shaft 52 is connected to the other end of the worm shaft 27 via a first electromagnetic clutch 51. A power transmission shaft 52 supported by a bearing (not shown) is arranged on the axis of the worm shaft 27, and a flywheel 54 is connected to the other end via a second electromagnetic clutch 53, and
An intermediate portion of the power transmission shaft 52 is provided with, for example, a V-belt wheel 55 as a rotating body for input. To the V-belt wheel 55, rotational power generated by a driving device 56 having a motor is supplied via transmission means such as a V-belt (not shown).
The driving device 56 is built in the lower frame 22. The power transmission from the driving device 56 to the power transmission shaft 52 may use a gear train instead of the belt transmission means.

First and second electromagnetic clutches 51, 5 are provided inside a control panel (not shown) installed outside the main body frame 21.
A clutch control means 57 for controlling the on / off operation of the clutch 3 is provided. The control means 57 disengages the first electromagnetic clutch 51 and engages the second electromagnetic clutch 53 at the start of operation of the tableting machine, and starts the first electromagnetic clutch 51 after the flywheel 54 reaches a predetermined rotation range from the start of operation. Electromagnetic clutch 51
The second electromagnetic clutch 53 is configured to be disengaged when a turntable, which will be described later, reaches a steady rotation range from this point.

Whether the flywheel 54 has reached the predetermined rotation range is determined by the power transmission shaft 52 or the flywheel 5.
By detecting the detection information of the rotation speed detecting means such as a rotary encoder (not shown) provided in the motor 4 by a speed determiner in the clutch control means 57, it is determined whether or not the rotating disk has reached the steady rotation range. The detection information of the rotation speed detecting means such as a rotary encoder attached to the rotating disk side such as the main shaft is determined by a speed determiner in the control panel, and the clutch control means 57 The operation is controlled.

At the center of the lower frame 22, a substantially cylindrical support 33 protruding from the frame 22 is provided.
The lower end is inserted into the output chamber 26 and bolted. Further, on the lower frame 22, various lower punch cam means and lower punch pressure rollers 3 are located around the support body 33.
4 are arranged.

As the lower punch cam means, in addition to the lowering unit 35 shown in FIG. 1, a weight adjusting rail, a transfer rail, a push-up rail, and the like (not shown) are used. The lowering device 35 provided at the powder supply position lowers a lower punch described later. The weight adjustment rail, which is arranged at the weighing position adjacent to the outlet side of the lowering device 35 and whose height position is appropriately changed, changes the height position of the lower punch with respect to the mill described later. Thereby, the filling amount of the powder taken into the mortar, in other words,
Adjust the weight of the molded product to a predetermined value. The delivery rail is located adjacent to the exit side of the heavy rail. The push-up rail is arranged at the position where the molded product is taken out, and raises the lower punch. The lowering device 35 is disposed adjacent to the exit side of the push-up rail. The lower punch pressure roller 34 is rotatably provided at a compression molding position between the delivery rail and the push-up rail. In FIG. 1, reference numeral 36 denotes a pressing force adjusting means for adjusting the height position of the lower punch pressing roller 34, and 37 denotes a cam holder for supporting the lower punch cam means.

A main shaft 38 is disposed in the support body 33 so as to extend through the support body 33 in the axial direction. The main shaft 38 is formed by a bearing 39 provided on the partition wall 25 and a pair of upper and lower bearings 40 provided inside the support body 33. It is rotatably supported. A worm gear 41 housed in the output chamber 26 is attached to the main shaft 38, and the gear 41 is meshed with the worm 28. The worm 28, the worm gear 41, the power transmission shaft 52, and the belt transmission means include a driving device 56
And a main shaft 38, and the first electromagnetic clutch 51 is provided on this transmission path.

Therefore, when the first electromagnetic clutch 51 connects the worm shaft 27 and the power transmission shaft 52, the worm shaft 27 and the worm 28 are rotated by the power of the driving device 56 supplied to the V-belt wheel 55, Since the worm gear 41 is rotated at a reduced speed, the main shaft 38 is rotated together with the gear 41. At this time, the electromagnetic brake 3
2 does not work.

An upper punch pressure roller 44 is mounted on the upper frame 23 at a position corresponding to the lower punch pressure roller 34. An upper cam 42 as a cam means for an upper punch is bolted to the lower surface of the upper frame 23. The planar shape of the upper cam 42 is circular, and has an outer peripheral portion having a cam portion 43 continuous over the entire circumference. The cam portion 43 has an ascending region, a descending region, and the like (not shown).
As shown in FIG. 1, the upper end of the main shaft 38 is inserted into the center of the upper cam 42.
A plurality of bearings 49 for rotatably supporting are provided.

A rotary disk 61 which is rotated together with the main shaft 38 is bolted to the main shaft 38 between the upper and lower frames 22 and 23. The turntable 61 has a die mounting portion 62 at an axially intermediate portion thereof, and an upper punch mounting portion 63 facing the upper surface thereof.
And a lower punch mounting portion 64 facing the lower surface of the die mounting portion 62.
And are provided integrally. Each of these mounting portions 62-6
Each of the reference numerals 4 extends outside the turntable 61 and is provided continuously in the circumferential direction of the turntable 61.

A plurality of dies 65 are mounted on the mortar mounting portion 62 by the main shaft 3.
It is mounted on the same circle drawn around 8,
These dies 65 are provided at predetermined intervals on the same circle. A plurality of upper punch holder holes 66 penetrating the upper punch mounting portion 63 are provided corresponding to the dies 65, respectively. Each upper punch holder hole 66 has an upper punch 67
Are provided so as to be freely slidable in the vertical direction, and their punch tips are inserted into and removed from the die 65 from above. A plurality of lower punch holder holes 68 penetrating the lower punch mounting portion 64 are provided corresponding to the dies 65, respectively. A lower punch 69 penetrates through each lower punch holder hole 68 so as to be slidable in the vertical direction, and the tip of the punch is held in a state of being inserted into the die 65.

Next, the powder supply device 71 will be described with reference to FIGS. The supply device 71 includes a feeder unit 72 shown in FIGS. 2 and 3, a driving unit 73 shown in FIG. 3, and a shaft connecting unit 74 shown in FIG. The feeder unit 72 includes a powder supply unit 75 and a plurality of, for example, two stirring blades 7 housed in the container 75.
6 are formed.

That is, a flat feeder mounting base 77 is disposed adjacent to the outside of the die mounting portion 62 over the powder supply position and the weighing position. The mounting base 77 is supported by a height adjusting shaft 78 from below, and is provided such that the upper surface thereof is flush with the upper surface of the die mounting portion 62. The mounting base 77 and the die mounting portion 62
The powder feeder body 75 disposed over the upper surface of the feeder is detachably attached to a feeder attachment base 77. In order to enable this attachment / detachment, a U-shaped groove 79 formed in an attachment projection at both ends in the longitudinal direction of the powder supply body 75 is provided.
Hand-turnable mounting screws 80 screwed into the feeder mounting base 77 are passed through. The body 75 is positioned and fixed at a predetermined position by tightening the screws 80, and the body 7 is loosened by tightening.
5 can be removed radially outward of the turntable 61. A turntable-side portion 75b of a powder feeder body 75 disposed between the die mounting portion 62 and the upper punch mounting portion 63
Is formed so as not to hit the upper punch 67.

The powder supply unit 75 has a plurality of stirring chambers 81 and 82 corresponding to the respective stirring blades 76 and communicating with each other. In the center of the stirring chambers 81 and 82 lined up along the rotation direction of the rotary disk 61, driven shafts 83 and 84 penetrating the upper lid 75a of the powder supply body 75 are arranged, respectively. Each of the driven shafts 83 and 84 penetrates vertically through a bearing bracket 85 attached to the upper surface of the upper lid 75a, and is rotatably supported by a plurality of bearings 86. The driven shafts 83 and 84 are parallel to each other, and their upper ends project toward a drive shaft described later. The dual bearing bracket 85 is formed integrally with a flat bracket base 87 fixed to the upper surface of the upper lid 75a with screws (not shown).
A dust-proof seal 93 is provided between the powder supply unit 5 and the powder supply unit 75 to prevent the powder in the container 75 from entering the bearing bracket 85.

At the lower ends of the driven shafts 83 and 84, a stirring chamber 8 is provided.
Stirring blades 76 housed individually at 1 and 82 are connected. The stirring blades 76 have a plurality of stirring blades radially protruding from a blade base fixed to the driven shaft 83 or 84. Then, as shown in FIG. 3, the positions of the tip ends of the stirring blades of both stirring blades 76 are different from each other, and the stirring blades of both stirring blades 76 are both stirred as shown in FIG. 2. The communication portions of the chambers 81 and 82 are rotated in a staggered manner.

The upper lid 75 a is located at one end in the longitudinal direction of the powder supply unit 75, that is, at the end located at the rear side in the rotation direction of the rotary disk 61, and both powders facing the stirring chamber 81. A material supply port 88, a powder reservoir 89 near the supply port 88, and a powder level sensor 90 are mounted respectively. A powder supply chute 91 is connected to the powder material supply port 88, and the upper end of the chute 91 is connected to the upper frame 22.
Is connected to an outlet of a raw material hopper (not shown) provided above the hopper. The powder reservoir 89 is a short cylinder whose upper end face is closed by a fine mesh with a mesh. The powder reservoir 89 reduces the powder level fluctuation in the powder feeder body 75 at the time of dropping the powder supply chute 91 and replenishing the powder material to be supplied. It is provided in order to. An outlet mechanism provided at the outlet of the raw material hopper is controlled based on the height position of the powder surface in the powder feeder body 75 detected by the powder surface sensor 90, so that an appropriate amount of powder is supplied appropriately. The height position of the powder surface is kept constant.

The other end in the longitudinal direction of the powder feeder body 75, that is, the turntable-side portion 75b located on the rear side in the direction of rotation of the turntable 61, supplies powder to the upper surface of the die mounting portion 62. The mouth 92 is open. The powder supply port 92 is provided on the rotation locus of the mill 65, and the supply port 9
2, powder material can be supplied from the powder supply body 75 to the mortise 65.

The driving section 73 is separated from the feeder section 72 and is disposed above the feeder section 72, for example, in the upper frame 23. As shown in FIG. 3, the driving unit 73 has a driving motor 101 installed on the bottom wall 23 a of the upper frame 23 and a transmission mechanism 102 interlocked with the motor 101. The transmission mechanism 102 employs, for example, a gear train. The gear train includes a driving small gear 103 fixed to an output shaft of a driving motor 101, a large-diameter output gear 104 meshed with the gear 103,
An odd number of transmission intermediate gears 105 meshed with and interlocked with the gear 104 and a large output gear 106 meshed with the final transmission intermediate gear.

The large-diameter output gears 104 and 106 correspond to the other gears 1.
The number of teeth is larger than that of the teeth 03 and 105, and they are rotated in the same direction with the same number of teeth. The output shafts 104 and 106 correspond to the driven shafts 83 and 84, respectively, and correspond to the drive shafts 107 and 10 respectively.
8 are attached. Both the drive shafts 107 and 108, which are driven to rotate in the same direction in synchronization with each other,
3a, it protrudes toward the powder supply body 75 side. The drive motor 101 and the transmission mechanism 102 other than the drive shafts 107 and 108 are all arranged inside the upper frame 23, and the frame 23 is used as a case.

The shaft connecting means 74 is provided over the driven shaft 84 and the driving shaft 108 which are arranged corresponding to each other in the vertical direction, and similarly, the driven shaft 83 and the driving shaft 1 are provided.
07. These connecting means 74
As shown in FIG. 4, the connection pins 111 fixed to the upper ends (tips) of the driven shafts 83 and 84 in a direction perpendicular to the axis, and the lower ends (tips) of the drive shafts 107 and 108. A connection pin 112 penetrated and fixed in a direction perpendicular to the axis (FIG. 3
), And a shaft coupling 113.

The shaft coupling 113 has a lower first coupling shaft 114 made of a stepped shaft and a second coupling shaft 115 made of a pipe.
And is formed from The lower end of the large diameter portion of the first joint shaft 114 has a fitting hole 116 detachably fitted to the upper end of the driven shaft 83 or 84, and is connected to the connecting pin 111 by being connected to the hole 116. A notch groove 117 to be fitted is formed. A connection pin 118 protruding from the side surface is fixed to the upper end of the small diameter portion of the first joint shaft 114. A notch groove 119 is formed at the upper end of the second shaft coupling 115 so as to be detachably fitted to the connection pin 112. Further, an L-shaped pin passage groove 120 is formed in the second shaft coupling 115. The second joint shaft 115 is slidably fitted to the small-diameter portion, and a connection pin 118 is movably inserted into the pin passage groove 120 and is combined with the first joint shaft 114.

Therefore, the shaft coupling 113 is
By arranging the connection pins 18 so as to be inserted into the horizontal portions of the pin passage grooves 120, the connection posture having the entire length extended as shown in FIG. 4A can be maintained, and the connection pins 118 can be connected to the pin passage grooves 120. By arranging it so as to be inserted at the upper end of the vertical portion, it is possible to maintain the connection release posture in which the overall length is reduced as shown in FIG.

The shaft coupling 113 has a notch groove 117 at the lower end thereof connected to the connection pin 111 of the driven shaft 83 or 84.
And the notch groove 119 at the upper end is fitted to the connection pin 112 of the drive shaft 107 or 108,
The driven shaft 83 and the driving shaft 107 corresponding to the upper and lower sides or the driven shaft 84 and the driving shaft 108 are connected to each other. Moreover,
By reducing the length of these shaft couplings 113 as shown in FIG. 4B, the driven shaft 83 or 84 and the first connection shaft 114 are separated from each other, in other words, detached from the feeder unit 72. While disconnecting the two shafts,
In this disconnected state, the feeder unit is arranged (for example, removed) at a retreat position which does not hinder removal of the feeder unit.

The connection between the two shafts 83, 84 and 107, 108 by the shaft connecting means 74 as described above is shown in FIG.
, The notch groove 119 is inserted into the drive shaft 107 or 108.
After the first joint shaft 114 is pulled down and the shaft joint 113 is extended, the notched groove 117 is fitted to the connection pin 111 of the driven shaft 83 or 84, and This is performed by rotating the joint shaft 114 and inserting the connection pin 118 into the deep end of the horizontal portion of the pin passing groove 120. The disconnection of the two shafts by the connecting means 74 is the reverse of the procedure of the connection, that is, the first joint shaft 114 is rotated in the state of FIG. 120 from the back end of the horizontal part to the lower end of the vertical part, and then the first joint shaft 1
14, the fitting between the notch groove 117 and the connection pin 111 is released, and then the entire shaft joint 113 shortened by the above procedure is pulled down and the notch groove 11 is removed.
9 and the connection pin 112 are disengaged, and the shaft coupling 11
3 is removed from between the two shafts.

The rotary tableting machine has a scraper (not shown) provided in contact with the upper surface of the die mounting portion 62. Although not shown, a guide for lowering the upper punch is provided on the upper frame 23 or the upper cam 42 as necessary, and the upper punch 67 is forcibly moved at a predetermined position by sliding the upper punch 67 on the guide. It is made to descend to.

The operation of the rotary tableting machine having the above configuration is as follows.
The operation is started by operating the driving device 56. At this time, the driving device 56 is operated in a state in which the clutch control means 57 sets only the second electromagnetic clutch 53 to “ON”.
Then, the second electromagnetic clutch 53 connects the flywheel 54 to the power transmission shaft 52 on the input side of the first electromagnetic clutch 51 in the transmission path, and the first electromagnetic clutch 51 is in the “disengaged” state. The rotation of the power transmission shaft 52 interlocked with the driving device 56 is not transmitted to the turntable 61, but the rotation of the power transmission shaft 52 is transmitted to the flywheel 54 via the second electromagnetic clutch 53.

From the start of the operation, the flywheel 5
When 4 reaches the predetermined rotation range, the clutch control means 57 puts the first electromagnetic clutch 51 into the "on" state. As a result, the power of the driving device 56 is supplied from the power transmission shaft 52 to the worm shaft 27 via the first electromagnetic clutch 51, so that the worm 28 and the worm gear 4
The power of the driving device 56 is transmitted to the main shaft 38 and the rotating disk 61 integrally connected thereto through the first mesh.

At this time, the second electromagnetic clutch 53 is still in the "on" state, and the flywheel 54 and the power transmission shaft 5
2, the flywheel 54 rotates via the second electromagnetic clutch 53, the power transmission shaft 52, the first electromagnetic clutch 51, the worm shaft 27, and the worm 28 and the worm gear 41. It is provided to the main shaft 38 of the board 61.

After the rotation of the turntable 61 has thus started, when the turntable 61 reaches the steady rotation range, the clutch control means 57 puts the second electromagnetic clutch 53 into the "disengaged" state. As a result, the flywheel 54 is removed from the load on the driving device 56, and from this point onward, the driving device 56
The rotating disk 61 is steadily rotated at a low driving torque.

Since the drive motor 101 of the powder material supply device 71 is operated at the same time as the above-mentioned operation start-up, the two drive shafts 107 and 108 are synchronized and the same via the large-diameter output gears 104 and 106 of the transmission mechanism 102. Accordingly, the driven shafts 83 and 84 of the feeder unit 72 are synchronously rotated at the same speed in the same direction via the shaft connecting means 74. Therefore, the powder material in the powder feeder body 75 is stirred by the stirring blades 76 rotated together with the driven shafts 83 and 84.
The powder is flowed toward the powder supply port 92 while being stirred.

Therefore, the tablet is manufactured by the rotating disk 61 reaching the steady rotation region and being rotated by the start-up of the above operation. That is, when the mortar 65 is carried to the powder supply position, the powder in the powder supply device 70 is sucked into the mortise 65 from the powder supply port 92 as the lower punch 69 is lowered by the lowering device 35. Subsequently, as the lower punch 69 conveyed to the weighing position is raised by the weight adjustment rail, excess powder in the mortar 65 is discharged into the powder feeder 70 and returned, and a predetermined amount of powder is left in the mortar 65. It is. Next, after the above weighing, the mortar 65 is carried to the compression molding position.
The lower punch 69 is moved in a direction approaching each other by the upper and lower punch pressing rollers 44 and 34 to compress and mold the powder material in the die 65. After that, since the mortar 65 is carried to the pushed-up position, first, the upper punch 67 is raised by the ascending region of the cam portion 43 of the upper cam 42 and is extracted out of the mortar 65. Next, as the lower punch 69 is raised by the push-up rail, the molded product (tablet) in the die 65 is extruded onto the die 65. Finally, when the die 65 is carried to the take-out position, the extruded molded product hits the scraper, is separated from the lower punch 69, and is taken out of the turntable 61.

As described above, one molding cycle is completed each time the mill 65 is rotated by the turntable 61 once. Hereinafter, this molding cycle is repeated, and tablets are manufactured one after another.

By the way, in the stirring type powder supply device 71 provided in the rotary tableting machine having the above-described structure, the driving unit 73 for rotating the stirring blades 76 in the feeder unit 72 is separated from the feeder unit 72 and separated. Since it is arranged in the upper frame 23 above the feeder section 72, as described above, the powder material stirred by the stirring blades 76 in the powder feeder body 75 enters the driving section 73 and the transmission mechanism 102
There is no danger of sticking to each of the gears 103-106. Therefore, it is not necessary to clean the transmission mechanism 102 and remove the adhering powder therefrom, so that the maintenance of the tableting machine can be facilitated. In addition, since the transmission mechanism 102 is covered by the upper frame 23, a gear case conventionally required to accommodate the transmission mechanism 102 can be omitted.

The feeder 72 of the powder supply device 71
When disassembling and cleaning the, first remove it as shown in FIG.
4 (B) to the shaft connecting means 74 by the above-described procedure.
By operating the drive shafts 107 and 108 and the driven shafts 83 and 84
Is disconnected, and the shaft coupling 113 of the shaft connecting means 74 is removed so that the feeder portion 72 can be removed from the die mounting portion 62 of the turntable 61. Then, after loosening the mounting screw 80, the feeder mounting base 77
The feeder portion 72 is pulled out along the upper surface of the turntable 61 in the radial direction outside. Thus, the feeder portion 72 can be removed and the disassembly and cleaning can be performed.

In the disassembly cleaning and the like, there is no need to remove the entire powder supply device 71, and only the feeder unit 72 needs to be attached and detached while the drive unit 73 remains in the upper frame 23. Feeder section 7 detached and attached in this way
Since the drive unit 73 is not included in the unit 2, the weight of the feeder unit 72 to be detached can be significantly reduced, and the work of attaching and detaching the feeder unit 72 can be performed easily and in a short time. As a result, it is possible to reduce the possibility that the operator pinches a finger between the turntable 61 and the like, slides the hand and drops the finger, and hits the area with the momentum at the time of attachment / detachment to cause damage. Can be reduced.

The present invention is not limited to the first embodiment. For example, the driven shaft 83 or 84 of the shaft connecting means 74 used in the first embodiment and the first joint shaft 114 of the shaft joint 113 may be integrally formed. However, the configuration as in the first embodiment can shorten the length of the driven shaft 83 or 84, so that the driven shafts 83 and 84 may be erroneously bent when the feeder unit 72 is attached or detached. And the shaft connection means 74 can be easily attached and detached.

The shaft connecting means 74 separates the driven shaft from the drive shaft by detaching the shaft connecting means 74 as in the first embodiment, and does not hinder the removal of the feeder portion 72 in this separated state. Not only what is evacuated,
For example, by moving the driven shaft and the drive shaft in the axial direction along the driven shaft or the drive shaft, the driven shaft and the drive shaft are separated from each other. May be evacuated so as not to hinder the operation. In this case, the connection of the shaft connecting means to the driven shaft and the drive shaft can be performed by detachable screws.

Further, in the first embodiment, the drive unit 73 is provided above the feeder unit 72, but may be provided below the lower frame 22 or the like instead. However, the arrangement as in the first embodiment is excellent in that the dead space of the upper frame 23 can be effectively used.

Further, as described above, since the feeder section 72 does not have the drive section 73, the bracket base 87 in the first embodiment can be replaced with the upper wall 75a as shown by a two-dot chain line in FIG. And a communication port provided in the upper wall 75a so that the inner space (lower space) communicates with the inside of the powder supply body 75. In this case as well, the problem of the present invention can be solved, and the volume for accommodating the powder material can be increased by the amount of the lower space. In this case, the powder material supplied from the powder supply unit 75 to the mill 65 is suitable for a rotary tableting machine of a design specification that consumes a large amount of the powder material. This is excellent in that the height can be reduced from being largely fluctuated by the powder material supplied from the powder supply port 88. Further, the present invention is not limited to the rotary tablet press, but can be applied to other rotary powder compression molding machines in general.

[0053]

The present invention is embodied in the form described in detail above and has the following effects. Since the drive unit having the drive motor and the transmission mechanism is separated from the powder supply unit and the feeder unit having the stirring blades therein and arranged above or below this feeder unit, the powder supply operation to the mill is performed. If the powder material in the powder supply unit does not adhere to the transmission mechanism of the drive unit that transmits the driving force to the stirring blades in the feeder unit, it is not necessary to remove the drive unit for disassembly cleaning etc. Since it is good, the weight of the feeder unit to be detached can be significantly reduced, and therefore, the feeder unit can be easily attached and detached.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a rotary tableting machine according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a configuration around a feeder portion of the rotary tableting machine according to the first embodiment.

FIG. 3 is a longitudinal sectional view showing the configuration of the powder supply device of the rotary tablet press according to the first embodiment, taken along line ZZ in FIG. 2;

FIG. 4A is a perspective view showing a configuration of a shaft connecting unit of the powder supply device shown in FIG. 3 in a connected state. FIG. 4B is a perspective view illustrating a configuration of a shaft connecting unit of the powder supply device illustrated in FIG. 3 in a disconnected state.

[Explanation of symbols]

 Reference numeral 61: rotary disk, 62: die mounting part, 65: die, 67: upper punch, 69: lower punch 71: powder supply device, 72: feeder part, 73: drive unit, 74: shaft connecting means 75: powder supply device Body, 76: stirring blade, 83, 84: driven shaft, 101: drive motor, 102: transmission mechanism, 107, 108: drive shaft, 111, 112, 118: connection pin, 113: shaft coupling, 114, 115: coupling Shaft, 116: fitting hole, 117, 119: cutout groove, 120: pin passage groove.

Claims (1)

[Claims] 1. A powder supply device for supplying a powder material into a die mounted on a turntable, the supply device comprising:
A powder material to be supplied to a powder supply device body containing a plurality of rotationally driven stirring blades, while the powder material supplied thereto is agitated by the stirring blades, and the powder material is supplied from the powder supply device body into the die. In a rotary powder compression molding machine for compressing and molding a powder material taken into the dies by an upper punch and a lower punch that is moved up and down according to the rotation of a turntable, the powder supply device includes: A feeder unit having a blade and the powder supply unit housing the blades, a drive unit having a drive motor and a transmission mechanism interlocked with the motor, and arranged at a distance above or below the feeder unit; A plurality of drive shafts protruding from the transmission mechanism corresponding to each of the stirring blades and a plurality of driven shafts protruding from the powder supply body while individually supporting the stirring blades are separated. Connect as possible And a shaft connecting means connected to the rotary powder compression molding machine.