JP4509751B2 - Rotary powder compression molding machine - Google Patents

Description

  The present invention relates to a rotary powder compression molding machine such as a rotary tableting machine for producing tablets, for example, and more particularly to a rotary powder compression molding machine having an improved mortar mounting structure with respect to a mortar mounting portion of a rotating disk.

Conventionally, in order to attach a die to a die mounting portion of a rotating disk, a stepped hole is provided through the die attaching portion. Then, the mortar fitted in the stepped hole is prevented from coming down downward by the step of the stepped hole. A technique is known in which a die is fixed to a die attachment portion by engaging with a formed annular engagement groove (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2003-311493 (paragraphs 0019-0022, FIGS. 1 and 3)

  Since processing of the depth to the level difference of the stepped hole formed in the mortar mounting portion with high accuracy requires a very advanced technique, the processing tolerance of the depth is relatively large. Thereby, in the configuration in which the mortar is fitted and fixed in the stepped hole of the mortar mounting portion as in Patent Document 1, there is a high possibility that the height position of the mortar varies due to the processing tolerance of the depth.

  In the rotary powder compression molding machine, the filling depth of the powder material supplied into the die from the powder supplier is set by the height of the tip of the lower arm relative to the die attached to the die attachment part of the rotary disc . For this reason, the variation in the height position of the die adversely affects the accuracy of the filling depth, in other words, the weight accuracy of the compression molded product. Therefore, the mortar mounting structure described in Patent Document 1 in which the height position of the mortar is likely to vary due to the processing of the stepped hole is disadvantageous when trying to increase the weight accuracy of the compression molded product. This becomes more apparent as the compression molded product to be molded becomes smaller.

  Moreover, since there is a slight fitting gap between the stepped hole of the mortar mounting part and the outer periphery of the mortar fitted in this, the powder material that has entered the stepped hole through this gap is It collects in the corner around the step. For this reason, when cleaning the inside of a stepped hole after shaping | molding, it is not easy to remove reliably the powder material collected in the corner part of a stepped hole.

  An object of the present invention is to provide a rotary powder compression molding machine capable of improving the weight accuracy and reliably removing the powder material from the die fitting hole.

  In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that the mortar fitting hole of the mortar mounting portion of the rotating disk is formed as a straight through hole having a constant diameter and fitted into the mortar fitting hole. A retaining member for supporting the mortar from below is detachably attached to the lower surface of the mortar mounting portion, and the retaining member and a mortar retaining member detachably attached to the mortar mounting portion are provided in the mortar fitting hole. The fitted mortar is fixed to the mortar mounting portion.

  In the present invention, a straight through hole having a constant diameter indicates that it is not a stepped hole or a bent hole, and the diameter of the through hole is the diameter of the through hole when the through hole is a round hole. In the case where the through hole is a square hole, the diameter of a circle inscribed in each surface of the square hole is indicated. In the present invention, the retaining member refers to a member that is attached to the lower surface of the mortar mounting portion in order to prevent the mortar in the mortar fitting hole from falling off. The retaining member may be an annular plate integrally formed in the rotation direction of the rotating disk or a block shape, or a plate divided into a plurality and continuously arranged in an annular shape in the rotation direction of the rotating disk. But you can. In the present invention, the mortar fixing member refers to a member that is attached to the mortar mounting portion in order to prevent the mortar in the mortar fitting hole from coming off upward. For example, the mortar is pressed in the radial direction. Mortar bolts or mortar plates that press the mortar from above. In the case of a mortar plate, it may be an annular plate that is integrally continuous in the rotating direction of the rotating disk, or a plate that is divided into a plurality of pieces and arranged continuously in an annular shape in the rotating direction of the rotating disk.

  In the first aspect of the invention, the retaining member attached to the lower surface of the die attachment part is used as a step, and the die in the die fitting hole is supported and positioned from below the die, and the die is attached. The mortar can be fixed to the mortar mounting part by the mortar fixing member attached to the part. For this reason, the machining tolerance of the die fitting hole causes variation in the height position of the die as the die fitting hole can be made into a straight through hole with a constant diameter without processing the stepped hole. And the height position of the die can be accurately defined with reference to the retaining member. Furthermore, the mortar fitting hole formed of a straight through hole having a constant diameter has no step where the powder material is accumulated, and the retaining member and the mortar retaining member can be removed from the mortar mounting portion and cleaned.

  In the invention of claim 2, the thickness of the mortar mounting portion and the thickness of the mortar are the same, and the mortar retaining member is screwed from the peripheral surface of the mortar mounting portion and is engaged with the engaging groove on the outer periphery of the mortar. It is characterized by the fact that it is a matching mortar bolt.

  In the present invention, the fact that the thickness of the mortar mounting portion and the mortar is the same means that a slight variation due to the tolerance of the respective thickness dimensions is allowed and is not limited to being completely the same. The mortar bolt is screwed along a straight line connecting the center of the mortar and the center of the rotating disk, and the bolt tip engages with the engagement groove of the mortar. The screw side surface may be screwed between adjacent mortars so that the side surfaces of the bolts engage with the respective engaging grooves of the adjacent mortars.

  The invention of claim 2 is preferable in that it is not necessary to form a step for receiving a mortar fixing member for pressing the mortar from above, and an existing mortar can be used.

  According to the first and second aspects of the present invention, since the machining tolerance of the mortar fitting hole does not cause variation in the height position of the mortar, the weight accuracy can be improved, and further, the step where the powder material is accumulated is the mortar fitting. Rotating powder compression that can remove powder material reliably from the die fitting hole because the die attachment part can be cleaned with the retaining member and the die fixing member removed from the die attachment part, as well as in the hole. A molding machine can be provided.

  A first embodiment of the present invention will be described with reference to FIGS.

  Reference numeral 1 in FIG. 1 denotes a rotary powder compression molding machine (hereinafter abbreviated as a molding machine). A turntable 2 provided in the molding machine 1 is connected to a drive shaft 3 that is rotated by a drive device (not shown). Note that reference numerals 4 and 5 in FIG. 1 denote bearings that support the drive shaft 3. Each of the rotary tables 2 has an outer shape of a circular shape in plan view, and has an upper iron mounting portion 2a, a lower iron mounting portion 2b, and a mortar mounting portion 2c that are connected by overlapping the central portion thereof in the vertical direction. Yes. The turntable 2 of the present embodiment is a three-part type, but a two-part type in which the mortar attachment part 2c is integrally formed with the upper eyelid attachment part 2a or the lower eyelid attachment part 2b, or the upper eyelid attachment part 2a, the lower eyelid It is also possible to use a rotating disk in which the mounting portion 2b and the mortar mounting portion 2c are integrally formed.

  The mortar mounting portion 2c is located on a circle drawn by a radius centered on the center line of the drive shaft 3, and has at least one mortar fitting hole 6 at intervals, preferably at equal intervals. (See FIG. 2). These mortar fitting holes 6 are formed as straight through holes having a constant diameter, with the upper end opened to the upper surface of the mortar mounting portion 2c and the lower end opened to the lower surface of the mortar mounting portion 2c. Furthermore, mortar fixing holes 7 corresponding to the respective mortar fitting holes 6 are formed in the mortar mounting portion 2c. These mortar stop holes 7 are located on a straight line passing through the center of the rotary disk 2 and the center of the mortar fitting hole 6 and extend along this straight line. One end of the mortar stop hole 7 is open to the mortar fitting hole 6 and the other end is open to the outer peripheral surface of the mortar mounting portion 2c. Each mortar stop hole 7 has an internal thread portion on its inner peripheral surface.

  For example, the retaining member 8 divided into a plurality of parts is detachably attached to the lower surface of the mortar attaching part 2c using detachable bolts 9 and 10 (see FIGS. 3 and 4). In a state where all the retaining members 8 are attached to the mortar mounting portion 2c, these retaining members 8 are continuously arranged in an annular shape.

  As shown in FIG. 2, each retaining member 8 is formed of, for example, an arc-shaped flat plate. These retaining members 8 are preferably made of the same type of metal material as the mortar mounting portion 2c, but are not limited to this and have sufficient strength to prevent the mortar 14 from falling off as described below. It can be made of a metal material different from the mortar mounting portion 2c, and depending on the selection, a low-cost metal material or the like can be used. Moreover, each retaining member 8 has a width shorter than the radial width of the mortar mounting portion 2c, thereby further reducing the material cost.

  The retaining member 8 has a through hole 8 a adapted to the arrangement of the mortar fitting hole 6. The size of these through holes 8 a is smaller than the diameter of the mortar fitting hole 6. The through hole 8a is provided for passing a lower rod 25 described later. Further, the retaining member 8 has a plurality of bolt through grooves 8b that open to the edge of the shorter arc length, and a plurality of bolt through holes 8c on the edge side of the longer arc length. Have. The bolt through holes 8c are formed in parallel to each other. The bolt 9 is threaded through the bolt passage groove 8b and screwed into the screw hole 12 (see FIGS. 2 and 3) of the mortar mounting portion 2c, and the bolt 10 is threaded through the bolt passage hole 8c and screw hole 13 (see FIG. 2 and FIG. 3), the retaining member 8 is attached to the lower surface of the mortar attaching portion 2c.

  In this case, first, bolts 9 are incompletely screwed into all the screw holes 12, respectively, and the retaining member 8 is placed along the lower surface of the mortar mounting portion 2c, as shown by the arrow in FIG. By inserting the bolt through groove 8b into the corresponding bolt 9, the retaining member 8 can be temporarily held on the lower surface of the mortar mounting portion 2c. In this state, the position of the retaining member 8 is finely adjusted so that the bolt through hole 8c is just opposite to the screw hole 13, and then the bolt 10 passed through the bolt through hole 8c is sufficiently in the screw hole 13. While being screwed, the bolt 9 is sufficiently screwed. For this reason, the attachment of the retaining member 8 to the lower surface of the mortar attachment portion 2c can be simplified. It is also possible to provide a bolt through hole instead of the bolt through groove 8b. Further, each retaining member 8 can be detached from the lower surface of the mortar mounting portion 2c by a procedure reverse to the above procedure.

  FIG. 4 shows a state in which the retaining member 8 is attached to the lower surface of the mortar attaching portion 2c. In this state, the through hole 8 a is disposed concentrically with the mortar fitting hole 6. Moreover, due to the difference in diameter between the through hole 8 a and the mortar fitting hole 6, the hole edge portion of the through hole 8 a is arranged to form a step with respect to the mortar fitting hole 6. In other words, the lower end opening of the mortar fitting hole 6 is substantially narrowed by the retaining member 8 rather than the hole portion above it.

  In a state where the mortar mounting portion 2 c is attached to the retaining member 8, a mortar 14 is fitted into each of the mortar fitting holes 6 from above, and the lower surface of each mortar 14 is in contact with the retaining member 8. It is supported. These mortars 14 function as mold bodies, and have a mortar hole for forming the outer shape of the molded product at the center. The thickness of the mortar 14 is the same as that of the mortar mounting portion 2c. The upper and lower surfaces of the mortar mounting portion 2c and the upper and lower surfaces of the mortar 14 are both subjected to surface polishing so as to have a predetermined surface accuracy, and the thicknesses of the mortar mounting portion 2c and the mortar 14 are set. . An engagement groove 14 a made of an annular groove is formed on the outer peripheral surface of the mortar 14.

  In each of the mortar retaining holes 7, a mortar retaining bolt 15 that functions as a mortar retaining member is screwed in from the outer side of the mortar mounting portion 2a toward the center of the turntable 2. By this screwing, the steel ball 15a (see FIG. 4) attached to the tip of the mortar fixing bolt 15 is fitted into and engaged with the engaging groove 14a of the mortar 14, thereby fixing the mortar 14 to the mortar mounting portion 2c. Has been. 4 indicates a square hole into which a tool is inserted to rotate the mortar bolt 15, and the mortar bolt 15 can be attached to and detached from the mortar hole 7 by the rotation operation.

  As shown in FIG. 1, upper heel guide holes 21 are provided in the upper heel attachment portion 2 a so as to penetrate in the vertical direction in the same number as the mortar 14 and in the same arrangement as the mortar 14. In each of these upper rod guide holes 21, an upper rod 22 functioning as an upper punch is slidably attached in the vertical direction. These upper rods 22 are moved up and down as they are moved along the cam portion 23a provided on the outer peripheral portion of the upper cam 23 shown in FIG. The upper cam 23 is attached to the fixed upper frame 1a of the molding machine 1 and supports the bearing 4 at the center thereof.

  The lower armature attaching portion 2b is provided with lower armature guide holes 24 having the same number as the mortar 14 and the same arrangement as the mortar 14 so as to penetrate in the vertical direction. In each of these lower guide guide holes 24, a lower guide 25 that functions as a lower punch is attached so as to be slidable in the vertical direction. The tip portions of these lower punches 25 are inserted into the corresponding mortar holes of the mortar 14 to form the bottom of the mortar hole. Each lower rod 25 is moved up and down by the rotation of the turntable 2 as it moves along various lower rod guide tracks, such as a push-up track 26, a lowering device, a weight track, a delivery track, and the like.

  The upper punch 22 and the lower punch 25 arranged corresponding to the vertical direction are moved in the axial direction so that the tip portions thereof approach each other at the compression molding position, and the powder material filled in the die 14 is moved. Compression molding is performed. For this purpose, an upper roll 27 and a lower roll 28 are arranged at the compression molding position. The upper roll 27 is supported by the upper frame 1a, and the lower roll 28 is supported by a roll holder 29 fixed to a fixed lower frame (not shown).

  A powder feeder 30 shown in FIG. 1 is disposed at the powder supply position on the mortar mounting portion 2c, and a scraper (not shown) is disposed at the molded product removal position.

  When the rotating disk 2 is rotated by the molding machine 1 having the above-described configuration, the lower die 25 is pulled down by a lowering device (not shown) at the powder supply position, and the die already positioned directly below the powder supply device 30. 14, the powder material in the powder feeder 30 is sucked. Next, at the weight adjustment position, the filling depth of the powder material into the mortar 14 is determined as the lower arm 25 passes through a weight trajectory (not shown), and the mortar 14 is detached from the powder feeder 30 in this state. The filling of the powder material with respect to is completed.

  The tip of the upper punch 22 is inserted into the die 14 filled with the powder material at a position where the lower punch 25 is guided to a delivery track (not shown), and then the die 14 is moved to the compression molding position. Here, the upper roll 27 and the lower roll 28 move the upper punch 22 and the lower punch 25 so as to approach each other, and the powder material in the die 14 is compression-molded.

  After this molding, the upper punch 22 is lifted by the upper cam 23 and pulled out above the die 14, and the lower punch 25 is pushed up by a push-up track 26 (not shown) at the molded product take-out position. A compression-molded product is extruded. In this extruded state, the compression molded product on the heel is removed and discharged out of the rotating disk 2 by the scraper. Thereafter, the tip of the lower punch 25 is pulled down by the lowering device so as to sink under the powder feeder 30, and the powder material in the powder feeder 30 is sucked into the die 14.

  One molding cycle is completed by the series of operations described above, and thereafter the same cycle is repeated as the rotation of the turntable 2 continues.

  In the molding machine 1 that repeats the molding cycle, as described above, the retaining member 8 attached to the lower surface of the die attaching portion 2c is used as a step, and the die 14 in the die fitting hole 6 is placed under the die 14. In this state, the mortar fixing bolt 15 is screwed into the mortar mounting portion 2c to fix the mortar 14 to the mortar mounting portion 2c.

  Thereby, the mortar fitting hole 6 can be a straight through-hole having a constant diameter without being processed into a stepped hole. Accordingly, the processing tolerance of the die fitting hole 6 does not cause variations in the height of the die, so that the height position of the die 14 can be accurately defined with the retaining member 8 as a reference. For this reason, since the variation in the height of the upper surface of each die 14 can be suppressed with high accuracy, the filling depth of the die fitting hole 6 is set to the aforementioned filling depth set by the height of the tip of the lower punch 25 with respect to the die 14. Processing tolerances are not affected. Therefore, even if the weight of the compression molded product is small, it is advantageous in increasing the weight accuracy.

  In addition, when the mortar fitting hole 6 is machined in the mortar mounting portion 2c, since it is sufficient to make a straight hole with a constant diameter, the workability is good and the machining cost can be reduced.

  When the powder material remaining on the turntable 2 or the like is cleaned and removed after the molding machine 1 is used, the mortar fixing bolt 15, the mortar 14 and the retaining member 8 are removed, and these are separated separately. In addition, the upper and lower surfaces of the die attachment portion 2c and the die fitting hole 6 can be cleaned. In particular, in cleaning the mortar mounting portion 2c, since there is no step in which the powder material is accumulated in the mortar fitting hole 6 formed of a straight through hole, the mortar fitting hole 6 can be easily cleaned. The lower surface of the mortar mounting portion 2c exposed by removing the retaining member 8 can be easily cleaned. For this reason, the remaining powder material can be reliably removed.

  In addition, in the present embodiment, the mortar 14 is fixed to the mortar mounting portion 2c by the retaining member 8 and the mortar fixing bolt 15, so that the mortar mounting portion 2c can have the same thickness as the mortar 14, and the mortar 14 is placed on the upper side. It is not necessary to form a step for receiving a mortar holding member that is pressed and fixed, and this is preferable in that an existing mortar 14 can be used.

  FIG. 5 shows a second embodiment of the present invention. Since 2nd Embodiment is the same as 1st Embodiment except the matter demonstrated below, it attaches | subjects the same code | symbol as 1st Embodiment about the same matter, and abbreviate | omits description.

  In the second embodiment, the thickness of the mortar 14 is larger than the thickness of the mortar mounting portion 2c, and each of the upper end portion 14b and the lower end portion 14c has a smaller diameter than the trunk portion 14d therebetween. The thickness of the trunk portion 14d is the same as the thickness of the mortar mounting portion 2c.

  For example, a mortar plate 16 is detachably disposed as a mortar member on the upper surface of the mortar mounting portion 2c. This mortar stop plate 16 has the same configuration as that of the retaining member 8 and is arranged in an annular shape or in a split type, and has one or more through holes 16a. The mortar retaining plate 16 is provided on the upper surface of the mortar mounting portion 2c while fitting the upper end portion 14b of the mortar 14 into the through hole 16a and covering the upper surface of the barrel portion 14d. The thickness of the mortar stop plate 16 is the same as the height of the upper end portion 14b. The retaining member 8 is provided on the lower surface of the mortar mounting portion 2c while fitting the lower end portion 14c of the mortar 14 into the through hole 8a and covering the lower surface of the barrel portion 14d. The thickness of the retaining member 8 may be the same as or different from the height of the upper end portion 14b.

  In the mortar mounting portion 2c, fixing holes 17 and 18 are formed to penetrate around the mortar fitting hole 6, and bolts 19 are passed through these holes. That is, the bolt 19 passes through the retaining member 8 and the fixing hole 17 or 18 upward, and is screwed into a screw hole 16b formed on the back surface of the mortar retaining plate 16, respectively. As a result, the barrel portion 14d of the mortar 14 is sandwiched between the mortar retaining plate 16 and the retaining member 8, and the mortar 14 fitted in the mortar fitting hole 6 is fixed to the mortar mounting portion 2c. Note that there is no engagement groove on the outer periphery of the mortar 14 and the mortar retaining bolt used in the first embodiment is omitted. Except for the matters described above, the second embodiment is the same as the first embodiment.

  Also in the second embodiment, the mortar fitting hole 6 is not a stepped hole, but is formed by a straight through hole with no change in diameter. The problem can be solved. Moreover, in the second embodiment, since the mortar stop plate 16 covers the upper surface of the mortar mounting portion 2c, the mortar mounting plate 16 is used as a replacement part subjected to surface effect processing such as quenching. It is also preferable in that the durability of the die can be improved and the surface effect treatment of the mortar mounting portion 2c can be omitted. In the second embodiment, the lower end portion 14c of the mortar 14 may be omitted.

Sectional drawing which shows the surroundings of the rotary disk of the rotary powder compression molding machine which concerns on 1st Embodiment of this invention. The top view which decomposes | disassembles and shows the relationship between the mortar mounting part of the rotary disk of the powder compression molding machine of FIG. 1, and a retaining member. Sectional drawing which decomposes | disassembles and shows the relationship between the mortar mounting part of the turntable of the powder compression molding machine of FIG. Sectional drawing which shows the part to which the die | dye of the powder compression molding machine of FIG. 1 was attached. Sectional drawing which shows the part to which the die | dye of the powder compression molding machine which concerns on 2nd Embodiment of this invention was attached.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Molding machine (rotary type powder compression molding machine), 2 ... Rotating disk, 2c ... Die mounting part, 6 ... Die fitting hole, 7 ... Die fixing hole, 8 ... Retaining member, 8a ... Retaining member Hole, 9, 10 ... bolt, 14 ... mortar, 14a ... mortar engagement groove, 14b ... upper end of mortar, 14d ... mortar body, 15 ... mortar bolt (mortar member), 16 ... mortar plate (Mortar member), 16a ... through hole of mortar plate, 19 ... bolt

Claims (2)

  A mortar fitting hole of the mortar mounting portion of the rotating disk is formed by a straight through hole having a constant diameter, and a retaining member for supporting the mortar fitted in the mortar fitting hole from below is provided in the mortar mounting portion. The mortar attached to the mortar fitting portion is fixed to the mortar mounting portion with the retaining member and the mortar retaining member detachably attached to the mortar mounting portion. A rotary powder compression molding machine.   The mortar mounting part has the same thickness as the mortar, and the mortar fixing member is screwed from the peripheral surface of the mortar mounting part to engage with the engaging groove on the outer periphery of the mortar. The rotary powder compression molding machine according to claim 1.

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