JP3027181U - Rotary powder compression molding machine - Google Patents

Abstract

(57) [Abstract] An object of the present invention is to cause unnecessary fine movement of a rotating disk due to backlash in a drive portion of the rotating disk. SOLUTION: In a rotary powder compression molding machine in which powder filled in a mortar 4 held on a rotary disk 3 is compression molded by an upper punch 5 and a lower punch 6, the rotary disk 3 is replaced by a vertical shaft 2. A plurality of bolts 18 are screwed onto a flange 17 formed in a radial direction at an axially intermediate portion of the rotary shaft 3, and a step portion 19 formed near the lower end of the vertical shaft 2 is attached to the outer diameter of the rotary disk 3. A worm wheel 9 having substantially the same outer diameter is fastened by screwing a plurality of bolts 20 in the axial direction of the vertical shaft 2, and a worm 11 having a tooth thickness meshing with the worm wheel 9 is different for each tooth 11a. It is arranged so as to be movable in the rotation axis direction.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention is a rotary powder compression molding in which a main shaft is rotatably arranged in a central portion, a rotary disk is fixed to the main shaft, and the rotary disk is rotated together with a die or a punch by driving the main disk. It is about machines.

[0002]

[Prior art]

 Conventionally, in a rotary powder compression molding machine that compresses and molds powder in a die attached to a rotary disc when the punch passes between the upper and lower rolls, the rotary disc is rotated around the outer periphery of the rotary disc to rotate the rotary disc. Either an external gear is provided to drive it directly, or an internal gear is provided to the inner circumference of the rotating disk to drive it directly. In such a system in which gears are provided directly on the rotating disk and directly driven, there is a risk that powder may enter the external gear or internal gear and interfere with rotation.

Therefore, there is known a structure in which the rotary disk is fixed to the vertical shaft and the rotary disk is rotated by rotating the vertical shaft. In such a rotating vertical shaft, a worm wheel is fixed near the lower end of the vertical shaft, and the worm is meshed with the worm wheel to drive the vertical shaft to rotate.

[0004]

[Problems to be solved by the device]

 By the way, in this type of molding machine, when the upper and lower punches pass between the upper and lower rolls, the pressure applied to the upper and lower rolls changes in relation to the passing state of the upper and lower punches. That is, the pressure gradually increases while the upper and lower punches compress the powder in the die, and the pressure becomes maximum when passing through the shortest gap between the upper and lower rolls. Up to the point when this maximum pressure is reached, a higher driving force is required as the pressure increases, but the combination of the worm and the worm wheel keeps the driving force constant, and therefore a slight rotation occurs when the maximum pressure is applied. The rotation speed of the board decreases. Also, when the maximum pressure is reached, the pressure causes strain in the upper and lower rolls. This strain becomes a reaction force when the upper and lower punches have finished passing through the upper and lower rolls, and a force that pushes the upper and lower punches in the traveling direction. For this reason, the turntable is momentarily pushed with a force equal to or greater than its driving force, and thus the turntable rotates faster than the drive force rotates. Normally, there is a gap in the meshing portion between the worm and the worm wheel, and the reaction force always causes the rotating disk to precede the rotation by the driving force by the gap.

For this reason, since the rotation speed of the vertical shaft is different between the fixed position of the turntable and the fixed position of the worm wheel, the vertical shaft is twisted and distorted. . Since this phenomenon occurs each time the upper and lower punches pass between the upper and lower rolls, the durability of the vertical shaft and the worm and the worm wheel is reduced. In addition, due to backlash in the worm wheel, the turntable may move slightly. When such a slight movement occurs, the fine movement may cause the powder to move in and out of the die, and the packing density of the powder in the die varies depending on the die, so that the hardness decreases depending on the product. It will be. Therefore, when the compression-molded product is taken out from the die, there is a problem that the hardness is insufficient to cause a chip or the taking out becomes difficult. In addition, the mechanical life is shortened by the transmission of fine movements to the support and drive parts of the rotating disk.

The present invention aims to solve such a problem.

[0007]

[Means for Solving the Problems]

 The present invention has taken the following means in order to achieve such an object. That is, in the rotary powder compression molding machine according to the present invention, a rotary disk is horizontally rotatably arranged in a frame through a vertical shaft, and a plurality of mortars are provided on the rotary disk at predetermined pitches. The upper and lower punches are held vertically above and below the die so that the upper and lower punches with the tips of the punches inserted into the die pass between the upper and lower rolls, In a rotary powder compression molding machine that compresses the powder filled in the shaft, the rotary disk is screwed with a plurality of bolts onto a flange formed by extending the radial direction at the intermediate portion of the vertical shaft in the axial direction. Worm wheel having an outer diameter that is approximately the same as the outer diameter of the rotary disk is screwed into the step formed near the lower end of the vertical shaft by tightening multiple bolts in the axial direction of the vertical shaft. The tooth thickness that meshes with the worm wheel is different for each tooth. The worm that characterized that you formed by movably disposed to the rotational axis direction.

With such a structure, since the rotary disk is screwed to the flange formed by extending the vertical shaft in the radial direction by the bolt, the rotary disk itself is radially moved by the tightening force of the bolt. There is no distortion. In addition, tightening with multiple bolts significantly increases the frictional force between the rotary disc and the flange, and the rotary disc can be firmly integrated with the vertical shaft. It is possible to minimize the displacement of the position, so that the key for positioning can be omitted.

Further, since the worm wheel is also screwed by a plurality of bolts like the turntable, the tightening force by the plurality of bolts increases the frictional force, and even if a key for positioning is omitted, the worm wheel can be mounted. The position does not shift. With respect to the worm wheel, the worm has different tooth thicknesses and is arranged so as to be movable in the rotation axis direction, so that the backlash can be adjusted. In other words, in the worm wheel and the worm, the meshing teeth are selected by moving the worm in the rotation axis direction to select the backlash according to the degree of wear of the worm wheel teeth. As a result, it is possible to prevent the fine movement of the rotary disk due to the backlash, and to prevent the filling degree of the powder from varying due to the fine movement, resulting in uneven hardness of the molded product.

[0010]

[Embodiment of device]

 According to the present invention, a rotary disk is screwed to a flange formed by extending in the radial direction of a vertical shaft with a plurality of bolts, and a worm wheel is attached to a step portion formed near the lower end of the vertical shaft by a plurality of bolts. A worm, which is screwed and meshed with the worm wheel, having a different tooth thickness for each tooth, is movably arranged in the rotation axis direction.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of the rotary powder compression molding machine of the present invention.

In this rotary powder compression molding machine, a rotary disk 3 is arranged in a frame 1 so as to be horizontally rotatable via a vertical shaft 2, and a plurality of mortars 4 are provided on the rotary disk 3 at a predetermined pitch. In each case, an upper punch 5 and a lower punch 6 are held above and below each die 4 so as to be vertically slidable. When the tips of the upper punch 5 and the lower punch 6 are inserted into the die 4, when they pass between the upper roll 7 and the lower roll 8, the powder filled in the die 4 can be compressed and molded. An upper roll 7 and a lower roll 8 are respectively arranged above and below the turntable 3 around the vertical shaft 2. The upper punch 5 held on the turntable 3 is guided to the highest position near the position where the powder is filled by the guide rail attached near the upper end of the vertical shaft 2, and at the position where it reaches the upper roll 7, It is designed to be guided to a lower position where it gets under the upper roll 7. Further, the lower punch 6 is moved up and down by a lowering device provided on the lower side of the turntable 3, and after the compression by the lower roll 8 is completed, when the molded product molded by the compression is taken out from the die 4, it reaches the highest position. You will be guided.

The frame 1 is composed of a pedestal, that is, a lower frame 1a and an upper frame 1b. This configuration basically aims to separate the molding section for compression molding from the driving section for driving this molding section. Specifically, a drive motor M is attached inside the lower frame 1a, and a gear chamber 10 for accommodating the worm wheel 9 is formed in the upper portion thereof. The rotation of the drive motor M is transmitted to a worm 11 described later via a V belt 12. On the upper surface of the gear chamber 10, a fixed platen 13 that supports the vertical shaft 2 is placed and fixed. For this reason, the inside of the gear chamber 10 is in a state of being isolated from the upper side of the lower frame 1a on which the rotary disk 3 is arranged, and the invasion of powder or the like to be molded is blocked. A vertical shaft lower bearing 14 is attached to the bottom surface of the gear chamber 10, and the lower end of the vertical shaft 2 is rotatably held. A space for the drive unit is formed in the lower frame 1a.

The vertical shaft 2 is formed to have a diameter as large as possible in order to increase rigidity, and the vertical shaft lower bearing 14 and the upper and lower tapered roller bearings 15 and 16 described above make the frame 1 substantially It is rotatably arranged in the center. A flange 17 is integrally formed at a position near the upper end of an intermediate portion of the vertical shaft 2 which is located above the fixed platen 13, and the flange 17 has a plurality of rotary platen lower parts 3a of the rotary platen 3. The worm wheel 9 is screwed by a bolt 18, and a worm wheel 9 is screwed by a plurality of bolts 20 on a stepped portion 19 formed near the lower end by making the outer diameter different. The step portion 19 is formed so as to face downward in the radial direction of the vertical shaft 2, and a plurality of bolts 20 are attached to the vertical shaft 2 with the boss portion of the worm wheel 9 being in close contact with the step portion 19 from the lower side. The worm wheel 9 is fastened and fixed by being screwed in the axial direction.

The turntable 3 is disposed on the lower side, holds the mortar 4 detachably on the same circumference at a predetermined pitch, and holds the lower punch 6 slidably, and a turntable 3a. It is composed of a turntable upper part 3b which is fixed to the lower part 3a by bolts and slidably holds the upper punch 5 therein. In this embodiment, as described above, the lower part 3a of the turntable is fastened and fixed to the flange 17 of the vertical shaft 2 by a plurality of bolts 18. The bolts 18 are arranged on the same circumference at a predetermined pitch so that the lower surface of the lower part 3a of the rotary disk and the upper surface of the flange 17 are brought into close contact with each other so that the frictional force between the two surfaces is maximized. Has become. In this way, the upper frame 1b in which the rotary disc 3 is housed constitutes the space of the molding part, and since the rotary disc 3 is held above the fixed plate 13 of the lower frame 1a, powder, moisture, etc. The structure is surely separated from the worm wheel 9 and the worm 11 that should not adhere.

The outer diameter of the worm wheel 9 is substantially the same as the outer diameter of the turntable 3, and corresponding to the teeth 11a of the worm 11 to be described later, the left and right tooth surfaces of the worm wheel 9 are different modules, and the lead angle is accurate. Although tooth cutting is performed, the tooth thickness and the width of the tooth groove are the same for all teeth. The worm 11 that meshes with the worm wheel 9 is a cylindrical worm, and, as shown in FIG. 3, is of a type in which the left and right tooth flank modules have a slight difference. Therefore, the lead and lead angle of the tooth surface are slightly different. Therefore, the tooth thickness of the worm 11 changes uniformly by the difference between the leads on the left and right tooth surfaces. The worm 11 having such a configuration is arranged on the bottom surface of the gear chamber 10 at a position where it meshes with the worm wheel 9 so as to be movable in the rotation axis direction. That is, as described above, since the tooth thickness of the worm 11 is changed, the backlash can be adjusted by selecting the tooth 11a that meshes with the worm wheel 9. In this case, since the worm 11 has a cylindrical shape, even if the mounting position of the worm 11 is moved in the axial direction of the worm shaft 21, it does not adversely affect the meshing state, and the worm 11 rotates equally on the left and right tooth surfaces. Therefore, the backlash does not change at any moment of meshing.

As shown in FIG. 2, the worm 11 is formed in a substantially middle portion of the worm shaft 21, and a V pulley 22 on which a V belt 12 is stretched is attached to one end of the worm shaft 21. An adjusting bearing portion 23 capable of moving and adjusting is provided in the vicinity thereof, a movable bearing portion 24 disposed in a movable state with respect to the lower frame 1a is provided in the vicinity of the other end, and a handwheel handle 25 is attached to the other end. Has been. The adjustment shaft receiving portion 23 includes a first bearing 23a that rotatably supports the worm shaft 21, an inner moving screw 23b that supports the first bearing 23a inside, and an inner moving screw 23b that is fixed to the lower frame 1a. An outer moving screw 23c that is screwed to the outside and a lock nut 23d that is screwed to the inner moving screw 23b to prohibit the movement of the outer moving screw 23c. The inner moving screw 23b is movably supported by the lower frame 1a. On the other hand, the movable bearing portion 24, which can move when the worm shaft 21 expands due to heat, includes a flange 24a movably attached to the lower frame 1a and a second bearing 24b fixed to the flange 24a. .

The adjustment of the engagement between the worm 11 and the worm wheel 9, in other words, the position adjustment of the worm 11 is performed by loosening the lock nut 23d so that the inner moving screw 23b can move and rotating the worm wheel 9. It is held in a state where it is not held and the hand-turning handle 25 is operated. That is, when the handwheel 25 is rotated, the worm shaft 21 rotates and the worm 11 is guided by the teeth of the worm wheel 9 to move the meshing position. As described above, the teeth of the worm 11 have a uniform tooth thickness, and the worm wheel 9 has a uniform tooth groove, so that the backlash at the meshing position changes. . This position adjustment may be performed so that backlash is minimized. Then, after moving the worm 11 to a predetermined position, the lock nut 23d is fixed and the adjustment bearing portion 23 is fixed to the lower frame 1a.

In such a structure, since the rotary disk 3 has the rotary disk lower portion 3a screwed to the flange 17 of the vertical shaft 2 by the plurality of bolts 18, it is not necessary to attach a key for positioning. . Further, when the rotary disk 3 is attached to the vertical shaft 2 with the power lock and the tightening bolts like the conventional one, the power lock bulges in one direction depending on the tightened state of the tightening bolts, and the rotary disk 3 is rotated. The center of the vertical shaft may be slightly displaced from the center of the vertical shaft 2. However, in the case of this embodiment, like the power lock, the fixing shaft interposed between the rotary disk 3 and the vertical shaft 2 is used. Since there is no member of, there is no such displacement of the center. Therefore, the upper punch 5, the die 4, and the lower punch 6 are arranged in a straight line without any special position adjustment. Further, since the rotary table lower portion 3a is screwed by the plurality of bolts 18, the frictional force between the rotary disk lower portion 3a and the flange 17 becomes extremely large, and the rotary disk 3 and the vertical shaft 2 are firmly integrated. can do. Similarly, since the worm wheel 9 is also screwed to the vertical shaft 2 with the plurality of bolts 20, it can be firmly and integrally attached to the vertical shaft 2, and a position shift occurs during the mounting. There is no need for a key for positioning.

Further, since the worm wheel 9 and the worm 11 are built in the gear chamber 10 of the lower frame 1a, even if the powder falls from the rotating disc 3 during operation, it is blocked by the fixed plate 13. Therefore, the worm wheel 9 and the worm 11 do not drop and therefore do not attach. Therefore, the worm wheel 9 and the worm 11 are not contaminated by the powder, and stable operation can be continued for a long time. Further, since the position of the worm 11 can be adjusted by rotating the handwheel 25, the backlash can be adjusted very easily even when each tooth changes with the lapse of time, and the worm 11 can always be adjusted to the minimum. Can be kept in the state of backlash. In addition to this, since the worm shaft 21 is supported by the movable bearing portion 24, even if the worm 11 generates heat during operation and the axial length extends, it does not distort. Therefore, even in the operating state, it can be rotated at the meshing position where the backlash is always minimized. Moreover, since the backlash is small, the twist of the vertical shaft 2 is small, and the distortion due to the twist is small, and the durability can be improved.

As described above, since the backlash is minimized, the fine movement of the turntable 3 is suppressed, so that the amount of powder supplied to the die 4 becomes uniform, that is, the powder filling amount becomes uniform. The hardness of the compression molded product can be maintained at a predetermined value or higher. Further, since the hardness is evenly increased, the number of defective molded products is reduced, and the yield can be improved.

The present invention is not limited to the embodiment described above.

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

[0025]

As described in detail above, according to the present invention, since the rotary disk is screwed to the flange formed by extending the radial direction of the vertical shaft with a plurality of bolts, the rotary disk and the flange are not separated from each other. The frictional force of the is greatly increased, and the turntable can be firmly integrated with the vertical shaft. Also, since the bolts are screwed into the flange, the rotating disc itself will not be distorted in the radial direction of the vertical shaft by the tightening force of the bolts, and the deviation of the relative position between each die and each upper and lower punches should be minimized. Therefore, it is possible to omit the key for positioning.

Further, since the worm wheel is also screwed by a plurality of bolts like the turntable, the friction force is increased by the tightening force of the plurality of bolts, and even if the key for positioning is omitted, It is possible to reliably prevent the deviation. Further, with respect to this worm wheel, since the worm has different tooth thicknesses and is arranged so as to be movable in the rotation axis direction, backlash can be adjusted. In such a worm wheel and worm, by selecting the tooth to be meshed by moving the worm in the rotation axis direction, the backlash can be adjusted according to the degree of wear of the tooth of the worm wheel. As a result, it is possible to prevent fine movement of the rotary disk due to backlash, and to prevent the powder filling degree from varying due to the fine movement, resulting in uneven hardness of the molded product.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing the inside of the gear chamber of the embodiment.

FIG. 3 is a vertical cross-sectional view of an engaging portion between a worm and a worm wheel according to the same embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Vertical shaft 3 ... Rotating plate 4 ... Mortar 5 ... Upper punch 6 ... Lower punch 7 ... Upper roll 8 ... Lower roll 9 ... Worm wheel 11 ... Worm 11a ... Tooth 17 ... Flange 18 ... Bolt 19 ... Step section 20 ... Bolt 21 ... Worm shaft

Claims (1)

[Scope of utility model registration request] 1. A rotary disc is horizontally rotatably disposed in a frame via a vertical shaft, a plurality of dies are provided on the rotary disc at a predetermined pitch, and upper and lower punches are provided above and below each mortar. It is held so that it can slide up and down, and the upper and lower punches with the tips of the punches inserted into the die are passed between the upper and lower rolls so that the powder filled in the die is compression molded. In a powder compression molding machine, a rotary disk is screwed by a plurality of bolts to a flange formed by extending in a radial direction at an axially intermediate portion of a vertical shaft,
A worm wheel having an outer diameter approximately the same as the outer diameter of the rotating disk is screwed into the step formed near the lower end of the standing shaft by tightening multiple bolts in the axial direction of the standing shaft. A rotary powder compression molding machine, characterized in that a worm having a meshing tooth thickness for each tooth is arranged so as to be movable in the direction of its rotation axis.