JP5378919B2 - Rotary tablet machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compactly lay out a load cell detecting a tablet hardness regulation mechanism, a buffer mechanism buffering an impact load applied to the hardness regulation mechanism and a tableting load, and a load cell detecting the set elastic force of the buffer mechanism with simple structure. <P>SOLUTION: The rotation type tablet molding machine is provided with: a hardness regulation mechanism 17 regulating the upper and lower positions of a pressure roll 7; a relief moving mechanism 23, when being applied with an impact load from the pressure roll 7, relieving and moving at least a part of the hardness regulation mechanism 17; a buffer mechanism 32 buffering the impact load via the relief moving mechanism 23; a load cell 28 for set elastic force detection pressed against a casing 16 by the set elastic force of the buffer mechanism 32 and detecting the set elastic force of the buffer mechanism 32; and a load cell 26 for tableting load detection provided between the load cell 28 for set elastic force detection and the relief moving mechanism 23 and detecting the tableting load. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rotary tablet molding machine.

  In a rotary tablet molding machine provided with a mortar and pestle provided on a rotating disk and rotating together with the rotating disk, and a pressure roll for displacing the heel in the axial direction, the tablet is adjusted by adjusting the vertical position of the pressure roll. Many of them have a hardness adjusting mechanism for adjusting the hardness. In this type of rotary tablet molding machine, an excessive pressure reaction force is applied to the punch when an excessive powder is filled in the die, which becomes an impact load on the hardness adjusting mechanism via the pressure roll. Therefore, there is a case where a buffer mechanism for buffering the impact load is provided.

  Further, Patent Document 2 describes an example of a load cell mounting structure for detecting a powder compression molding load (tablet load).

JP-A-8-90296 JP 2002-113598 A

  In the rotary tablet molding machine having the shock absorbing mechanism, in addition to the load cell for detecting the tableting load, when it is intended to provide a load cell for detecting the set elastic force of the spring of the shock absorbing mechanism, the mounting structure for both load cells is complicated. There is a problem that it is easy to become.

  The present invention was created in order to solve such problems, and includes a tablet hardness adjustment mechanism, a buffer mechanism for buffering an impact load applied to the hardness adjustment mechanism, a load cell for detecting a tableting load, and a buffer mechanism. An object of the present invention is to provide a rotary tablet molding machine capable of laying out a load cell for detecting a set elastic force in a compact structure with a simple structure.

  In order to solve the above-mentioned problems, the present invention provides a rotary tablet molding machine provided with a mortar and a pestle provided on a rotating disk and rotating together with the rotating disk, and a pressure roll for displacing the heel in the axial direction thereof. A hardness adjusting mechanism that adjusts the vertical position of the pressure roll to adjust the hardness of the tablet; and when receiving an impact load based on an excessive pressure reaction force from the pressure roll, at least the hardness adjusting mechanism A relief moving mechanism that allows part of the relief movement to move, a buffer mechanism that cushions the impact load via the relief movement mechanism, and a set elastic force adjustment mechanism that can change the set elastic force of the buffer mechanism to an arbitrary value And a set elasticity that is pressed against the fixed member by the set elastic force of the buffer mechanism to detect the set elastic force of the buffer mechanism and is movable in conjunction with the escape movement of the escape movement mechanism when receiving the impact load Force detection It is provided between the docel, the set elastic force detection load cell and the escape movement mechanism to detect a tableting load, and is movable in conjunction with the escape movement of the escape movement mechanism when receiving the impact load. A tableting load detection load cell.

  According to this configuration, in the rotary tablet molding machine provided with the hardness adjusting mechanism and the buffer mechanism, the two load cells of the tableting load detection load cell and the set elastic force detection load cell can be laid out in a compact structure with a simple structure. Accordingly, the hardness adjusting mechanism, the buffer mechanism, the tableting load detection load cell, and the set elastic force detection load cell can be intensively incorporated in one housing, thereby improving maintenance efficiency and reducing the size of the rotary tablet molding machine. Can be achieved. In particular, it is possible to easily check the calibration of the tableting load detection load cell and the set elastic force detection load cell performed during maintenance by inserting a master load cell between them.

  Further, according to the present invention, the hardness adjusting mechanism includes a worm gear including a worm and a wheel provided on an output shaft of a drive motor, and a rotation of the wheel, and linear movement by a feed screw action to move the upper and lower sides of the pressure roll. A position adjusting shaft for adjusting a position, and the escape movement mechanism is configured such that an inner peripheral side is screwed to the position adjusting shaft and an outer peripheral side is splined to an inner peripheral wall of the wheel to receive the impact load. And a cylindrical escape member that escapes and moves together with the position adjusting shaft.

  According to this configuration, the hardness adjusting mechanism and the relief moving mechanism can be combined into a simple structure with a small number of parts, and the manufacturing cost and the size of the rotary tablet molding machine can be reduced.

  In the invention, it is preferable that the buffer mechanism includes a compression coil spring, and the set elastic force adjustment mechanism includes an adjustment screw that compresses and adjusts the compression coil spring.

  According to this configuration, the buffer mechanism and the set elastic force adjusting mechanism can be combined into a simple structure with a small number of parts, and the manufacturing cost and size of the rotary tablet molding machine can be reduced.

  According to the present invention, the tablet hardness adjusting mechanism, the shock absorbing mechanism for buffering the impact load applied to the hardness adjusting mechanism, the load cell for detecting the tableting load, and the load cell for detecting the set elastic force of the buffer mechanism can be made compact with a simple structure. Can be laid out. Also, the calibration of each load cell can be easily checked.

It is a sectional side view around the turntable of the rotary tablet molding machine according to the present invention. (A), (b) is sectional explanatory drawing of a pressure roll and a spindle, respectively, and a side view. It is a sectional side view of the principal part of the rotary tableting machine which concerns on this invention. It is A arrow directional view (partial cross section) in FIG.

  In FIG. 1, a rotary tablet molding machine 1 according to the present invention includes a mortar 3, an upper punch 4, a lower punch 5, and an upper punch 4 and a lower punch 5 which are provided on a rotary disc 2 and rotate together with the rotary disc 2. An upper pressure roll 6 that is displaced in the axial direction and a lower pressure roll 7 are provided. The pressure rolls 6 and 7 are attached to the fixed frame 8. The rotating disk 2 is attached to a vertical rotating shaft 9, and a plurality of mortars 3 are provided at equal intervals in the circumferential direction on the rotating disk 2. Is slidably held in the axial direction, that is, up and down. As the turntable 2 rotates, the upper punch 4 and the lower punch 5 are moved up and down toward the die 3 by being pressed by the press rollers 6 and 7 when passing through the press rollers 6 and 7, respectively. The powder filled in the mortar 3 is compressed into tablets.

  As shown in FIG. 2, the pressure roll 7 is rotatably attached to an eccentric portion 10 a formed around the center of the support shaft 10. Symbol X1 indicates the axis of the support shaft 10, that is, the axis of the end portions 10b and 10c, and symbol X2 indicates the axis of the eccentric portion 10a. As shown in FIG. 1, the end portion 10b of the support shaft 10 is supported on the fixed frame 8, and the end portion 10c (FIG. 2) is supported on the bearing stand 11 via the bearing.

  A hexagonal column piece 10d that is coaxial with the end portion 10c protrudes from the end face of the end portion 10c. An eccentric joint 12 having a hexagonal hole fitted to the hexagonal column piece 10d at one end is connected to the hexagonal column piece 10d. The other end of the eccentric joint 12 is formed as a clevis 12a as shown in FIG. 2 (a). As shown in FIGS. 3 and 4, the clevis 12a and a vertical position adjusting shaft 14 that moves up and down. A clevis 14 a formed at the upper end of the crankshaft 14 is connected by a crank arm 13. Thus, by adjusting the position adjustment shaft 14 up and down, the eccentric joint 12 rotates about the axis X1 via the crank arm 13, and the support shaft 10 connected to the eccentric joint 12 by the hexagonal column piece 10d (see FIG. 2) also rotates, and the axis X2 of the eccentric portion 10a (FIG. 2) moves up and down with an arc locus around the axis X1, and the vertical position of the pressure roll 7 is adjusted. That is, in FIG. 1, the amount of the lower punch 5 entering the mortar 3 is adjusted, and the hardness of the tablet is adjusted.

  As shown in FIG. 3, the position adjusting shaft 14 penetrates the horizontal plate-like main body frame 15 up and down, and the lower end thereof faces the inside of a vertical cylindrical casing 16 fixed to the lower surface of the main body frame 15. . A hardness adjustment mechanism 17 that adjusts the vertical position of the pressure roll 7 to adjust the hardness of the tablet receives the rotation of the worm gear 21 including the worm 19 and the wheel 20 provided on the output shaft of the drive motor 18 and the rotation of the wheel 20. And the position adjusting shaft 14 that adjusts the vertical position of the pressure roll 7 by moving linearly by a feed screw action.

  The wheel 20 is provided coaxially below the position adjustment shaft 14 in the housing 16 and meshes with the worm 19 through a notch portion of the housing 16. The wheel 20 has a ring shape, and its inner peripheral wall 20a is splined to the outer peripheral side of the cylindrical relief member 22. A female screw is formed on the inner peripheral side of the escape member 22 and is screwed with a male screw formed on the outer periphery of the position adjusting shaft 14. When the output shaft of the drive motor 18 rotates forward and backward, the wheel 20 and the escape member 22 splined to the inner peripheral wall 20a of the wheel 20 rotate integrally, and the position adjustment shaft 14 screwed to the escape member 22 is fed to the feed screw. Moves up and down by action. The escape member 22 functions as a part of the hardness adjusting mechanism 17 and also functions as an escape movement mechanism 23 that moves away when receiving an impact load based on an excessive pressure reaction force from the pressure roll 7.

  The inner diameter of the housing 16 is formed as a large-diameter portion 16a, a small-diameter portion 16b, and a medium-diameter portion 16c in this order from above, and the outer periphery around the upper portion of the escape member 22 is the through-hole of the main body frame 15 and the large diameter of the housing 16 It is supported by a ring-shaped support member 24 provided over the portion 16a. Further, the wheel 20 is positioned in the vertical direction by the upper surface abutting on the lower end of the support member 24 and the lower surface abutting on the first step surface 16d formed by the step between the large diameter portion 16a and the small diameter portion 16b. Is done.

  The lower end of the escape member 22 is in contact with the disk-shaped first plate 25, and the lower surface of the first plate 25 is in contact with the tableting load detection load cell 26. These first plate 25 and tableting load detection load cell 26 slide in the small diameter portion 16b. A disk-shaped second plate 27 is slidably provided on the medium diameter portion 16c and is in contact with a second step surface 16e formed by a step between the small diameter portion 16b and the medium diameter portion 16c. Yes. A set elastic force detection load cell 28 is fixed to the lower surface of the second plate 27. In some cases, the set elastic force detection load cell 28 may be simply applied without being fixed to the second plate 27. A coil spring receiving seat 29 slidable in the medium diameter portion 16c is applied to the lower portion of the set elastic force detection load cell 28. Similarly, the coil spring receiving seat 29 slides in the medium diameter portion 16c. A compression coil spring 31 is provided between the possible coil spring push seats 30. The compression coil spring 31 constitutes a buffer mechanism 32 for buffering an impact load based on an excessive pressure reaction force from the pressure roll 7 via the escape movement mechanism 23 (escape member 22).

  A nut 33 is fixed to the lower end of the housing 16, and an adjustment screw 34 for compressing and adjusting the compression coil spring 31 is screwed into the nut 33. The upper end of the adjustment screw 34 passes through the through hole of the housing 16 and comes into contact with the lower surface of the coil spring pushing seat 30. A hexagon head 34a for attaching a tool is formed at the lower end of the adjustment screw 34 located outside the housing 16. The adjusting screw 34 constitutes a set elastic force adjusting mechanism 35 that can change the set elastic force of the buffer mechanism 32 to an arbitrary value.

  Hereinafter, the operation of the present invention will be described. First, the coil spring pushing seat 30 is moved by the adjusting screw 34, and the compression coil spring 31 is compressed and adjusted so as to have a desired set elastic force. Of course, the set elastic force of the compression coil spring 31 is set as a value larger than the normal tableting load. Therefore, the set elastic force detection load cell 28 is biased toward the tableting load detection load cell 26 by the elastic force of the compression coil spring 31 via the coil spring receiving seat 29, and is It will be in the state fixed with respect to the housing | casing 16 by being pressed on the 2 level | step difference surface 16e. Thereby, the set elastic force detection load cell 28 detects the set elastic force of the compression coil spring 31.

  On the other hand, in the tableting load detection load cell 26, the adjacent second plate 27 is positioned by being pressed against the second step surface 16e, so that the set elastic force of the compression coil spring 31 does not act. Therefore, only the tableting load from above acts on the tableting load detection load cell 26, and the tableting load detection load cell 26 detects only the tableting load transmitted from the pressure roll 7.

  For example, when excessive powder is filled in the die 3 (FIG. 1), an excessive pressure reaction force is applied to the pressure roll 7 via the lower punch 5 (FIG. 1), and the set elasticity of the compression coil spring 31. When acting on the hardness adjusting mechanism 17 as an impact load larger than the force, the position adjusting shaft 14 and the relief member 22 screwed into the position adjusting shaft 14 and splined to the inner peripheral wall 20a of the wheel 20 are downward. As a result, the transmission of the impact load to the worm gear 21 and the drive motor 18 is prevented. Then, the first plate 25, the tableting load detection load cell 26, the second plate 27, the set elastic force detection load cell 28, and the coil spring seat 29 move downward while being pushed and interlocked by the escape member 22. Thus, the impact load is buffered by the compression coil spring 31.

  As described above, the hardness adjustment mechanism 17 for adjusting the hardness of the tablet by adjusting the vertical position of the pressure roll 7 and the impact load based on the excessive pressure reaction force from the pressure roll 7 An escape movement mechanism 23 that enables at least a part of the adjustment mechanism 17 to escape, a buffer mechanism 32 that buffers the impact load via the escape movement mechanism 23, and a set elastic force of the buffer mechanism 32 to an arbitrary value. The set elastic force adjusting mechanism 35 that can be changed to the above and the set elastic force of the buffer mechanism 32 are pressed against the fixing member (housing 16) to detect the set elastic force of the buffer mechanism 32, and escape when receiving the impact load. A set elastic force detection load cell 28 that can move in conjunction with the escape movement of the moving mechanism 23, and is provided between the set elastic force detection load cell 28 and the escape movement mechanism 23 to detect a tableting load, and Impact load If it is configured to include a tableting load detection load cell 26 that can move in conjunction with the escape movement of the escape movement mechanism 23 when it is received, the rotary tablet molding machine 1 provided with the hardness adjustment mechanism 17 and the buffer mechanism 32. The load cell 26 for detecting the tableting load and the load cell 28 for detecting the set elastic force can be compactly laid out with a simple structure. Accordingly, the hardness adjusting mechanism 17, the buffer mechanism 32, the tableting load detection load cell 26 and the set elastic force detection load cell 28 can be intensively incorporated in the single casing 16, thereby improving the efficiency and rotation of the maintenance. The size of the tablet-type tablet forming machine 1 can be reduced.

  In particular, according to the present invention, the calibration of each of the tableting load detection load cell 26 and the set elastic force detection load cell 28 performed at the time of maintenance or the like is checked, and only the master load cell is inserted between them. Easy to do. That is, a master load cell is inserted between the two, and an appropriate tableting load larger than the elastic force is applied in a state where the elastic force of the compression coil spring 31 is loosened to move the three together. At that time, if the detection values of the tableting load detection load cell 26 and the set elastic force detection load cell 28 are the same as the detection values of the master load cell, it is normal, and if they are deviated, calibration is appropriately performed. In this way, the calibration of both the tableting load detection load cell 26 and the set elastic force detection load cell 28 can be simultaneously checked by a single operation, so that maintenance efficiency is improved.

  Further, the hardness adjusting mechanism 17 receives the rotation of the worm gear 21 including the worm 19 and the wheel 20 provided on the output shaft of the driving motor 18 and the wheel 20, and moves linearly by the feed screw action to move the pressure roll 7 up and down. The escape movement mechanism 23 has an inner peripheral side screwed to the position adjustment shaft 14 and an outer peripheral side spline-coupled to the inner peripheral wall 20a of the wheel 20 to adjust the impact load. When the rotary tablet molding machine 1 is configured to include a cylindrical relief member 22 that moves with the position adjusting shaft 14 when received, the hardness adjusting mechanism 17 and the escape moving mechanism 23 have a simple structure with a small number of parts. The manufacturing cost of the rotary tablet molding machine 1 can be reduced and the size can be reduced.

  Further, if the buffer mechanism 32 is constituted by a compression coil spring 31 and the set elastic force adjusting mechanism 35 is provided with an adjusting screw 34 for compressing and adjusting the compression coil spring 31, the buffer mechanism 32 and the set elastic force adjusting mechanism 35 are provided. A simple structure with a small number of parts can be combined, and the manufacturing cost and size of the rotary tablet machine 1 can be reduced.

  The preferred embodiment of the present invention has been described above. In the embodiment, the case where the present invention is applied to the lower pressure roll 7 has been described, but the present invention can also be applied to the upper pressure roll 6. In addition, the present invention is not limited to that described in the drawings, and can be appropriately changed in design without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Rotating tablet molding machine 2 Rotating disc 3 Dice 4 Upper punch 5 Lower punch 6,7 Pressure roll 14 Position adjustment shaft 16 Housing (fixing member)
17 Hardness adjustment mechanism 19 Worm 20 Wheel 21 Worm gear 22 Escape member 23 Escape movement mechanism 26 Load cell for detecting tableting load 28 Load cell for setting elastic force detection 31 Compression coil spring 32 Buffer mechanism 34 Adjustment screw 35 Set elastic force adjustment mechanism

Claims (3)

In a rotary tablet molding machine provided with a mortar and a pestle provided on a rotating disk and rotating together with the rotating disk, and a pressure roll for displacing the heel in the axial direction thereof,
A hardness adjusting mechanism for adjusting the hardness of the tablet by adjusting the vertical position of the pressure roll;
When receiving an impact load based on an excessive pressure reaction force from the pressure roll, an escape movement mechanism that enables escape movement of at least a part of the hardness adjustment mechanism;
A buffer mechanism for buffering the impact load via the escape movement mechanism;
A set elastic force adjusting mechanism capable of changing the set elastic force of the buffer mechanism to an arbitrary value;
A set elastic force detection that is pressed against a fixed member by the set elastic force of the buffer mechanism to detect the set elastic force of the buffer mechanism and is movable in conjunction with the escape movement of the escape movement mechanism when receiving the impact load. Load cell,
A tableting load provided between the set elastic force detection load cell and the escape movement mechanism to detect a tableting load and move in conjunction with the escape movement of the escape movement mechanism when receiving the impact load. A load cell for detection;
A rotary tablet molding machine comprising: The hardness adjusting mechanism includes a worm gear including a worm and a wheel provided on an output shaft of a drive motor, and a position adjustment for adjusting a vertical position of the pressure roll by receiving a rotation of the wheel and linearly moving by a feed screw action. And a shaft,
The escape movement mechanism is a cylindrical relief member whose inner peripheral side is screwed to the position adjusting shaft and whose outer peripheral side is spline-coupled to the inner peripheral wall of the wheel, and moves with the position adjusting shaft when subjected to the impact load. The rotary tablet molding machine according to claim 1, comprising: The buffer mechanism is composed of a compression coil spring,
The rotary tablet molding machine according to claim 1, wherein the set elastic force adjusting mechanism includes an adjusting screw that compresses and adjusts the compression coil spring.

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