JP4624859B2 - Powder lubricant injection device and 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 that compresses a powder material to produce a compression molded product such as a tablet, and a part intended for a powder lubricant provided in this molding machine The present invention relates to a powder lubricant injection device to be supplied to a machine.

  To suppress tableting troubles such as sticking and capping that occur in the process of molding tablets etc. with a rotary tablet press, and to improve moldability and disintegration of molded tablets etc., Powder lubricants such as magnesium stearate powder are used. An external lubrication system is known for supplying this powder lubricant to a target site of a rotary tableting machine (see, for example, Patent Documents 1 and 2).

  In Patent Document 1, a powder lubricant is sprayed from a lubricant spray nozzle by air pressure before a tablet is compressed and molded by an upper punch and a lower punch, and the lower end surface and the lower punch of the upper punch are injected. The technique of spraying on the upper end surface of is described.

  Further, in Patent Document 1, a negative pressure or a positive pressure air pulsation generated by the air pulsation wave generator is installed in a spraying chamber installed on a rotating disk, to which a lubricant sprayer and an air pulsation wave generator are connected. By spraying powder lubricant from the lubricant sprayer by supplying air in a state where the wave is constantly acting through the waveguide, the lubricant is diffused throughout the spray chamber, and the spray chamber Technology to discharge excess powder lubricant in the spray chamber to the outside with an air pulsation wave generator or blower while adhering the lubricant to the tip of the upper and lower punches and the inner surface of the die. Is described.

In Patent Document 2, the tip of an upward nozzle that injects the powder lubricant onto the upper arm, the lower armpit, and the mortar hole are placed in a box in which the powder lubricant is continuously sprayed. And a tip of a downward nozzle that injects the powder lubricant to the air curtain, and an air curtain that prevents the powder lubricant that has been ejected from these nozzles from being scattered upward is provided by an air flow supply mechanism. A technique is described in which dust powder formed in the vicinity of the lower end surface of the upper bowl and sucked into the powder dust suction mechanism from the dust suction pipe connected to the box is described.
Japanese Patent No.2681601 (paragraphs 0002, 0004, 0010-0018, FIG. 1 to FIG. 7) Japanese Patent No. 3415558 (paragraphs 0023-0041, FIGS. 1-9)

  In the technique described in FIG. 7 of Patent Document 1, since the area to which the powder lubricant is sprayed is not partitioned, the powder lubricant sprayed from the lubricant spray nozzle is scattered in a large amount around. Easy to be wasted. Moreover, in the technique described in FIG. 1 to FIG. 6 of Patent Document 1, a spraying chamber is provided, but the upper end thereof is opened to allow insertion / removal of the lower end portion of the upper collar, so that the powder is passed through this opening. A large amount of lubricant is scattered around and is likely to be wasted. In particular, in these techniques, when the powder lubricant is continuously sprayed, the sprayed powder lubricant is unnecessarily scattered by spraying between adjacent ridges attached to the rotating disk. End up.

  Furthermore, the air pulsation wave generator of Patent Document 1 cannot be installed near the scattering chamber on the rotating disk, and the air pulsation wave generated by the air pulsation wave generator is scattered through a waveguide connecting them. Leading to the room. As the length of the waveguide increases, the air pulsation wave attenuates and the diffusion performance of the lubricant in the spraying chamber becomes insufficient. For this reason, the reliability of attaching the powder lubricant to the tip surfaces of the upper and lower punches and the inner surface of the mortar is reduced.

  Moreover, since the number of air pulsations needs to be increased as the rotational speed and the number of reels increase, for example, in a rotary tableting machine that rotates at a high speed with a large number of rods, air must be pulsated at least 1000 times per minute Don't be. However, an air pulsation wave generator that generates air pulsation waves at a high speed and a lubricant sprayer that sprays a powder lubricant at high speed are not provided at present, and the current technology Production is considered difficult. Therefore, the technique of patent document 1 is applicable only to a low-speed rotary tableting machine, and cannot be applied to a high-speed tableting machine.

  Further, the technique of Patent Document 2 that prevents the powder lubricant from being scattered using an air curtain requires an air flow supply mechanism for forming the air curtain, and the air flow that forms the air curtain A high capacity is required for the powder dust suction mechanism that sucks together with the excess powder lubricant. For this reason, since the technique of patent document 2 must be large-scale in terms of equipment, it is not realistic.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a powder lubricant injection device having a simple structure that can reliably supply lubricant powder to a target portion while suppressing wasteful scattering, and rotary powder compression molding provided with the injection device. Is to provide a machine.

  In order to solve the above-mentioned problems, a powder lubricant injection device according to the present invention includes a cylinder having an injection hole and a peripheral surface disposed in the cylinder and in contact with or close to the inner peripheral surface of the cylinder. An injection member that has an opening and a spray opening that opens and closes at the injection hole and a peripheral wall portion that is continuous with the hole in the circumferential direction of the cylinder, and sprays the powder lubricant from the spray hole through the injection hole. And a drive unit that rotates one of the injection member and the cylinder, and a lubricant supply device that supplies a powder lubricant to the injection member by air conveyance.

  In the present invention, the spray port can be opened and closed at the injection hole and the peripheral wall portion continuous in the circumferential direction of the cylinder with respect to the hole by the relative rotation of the cylinder and the injection member in accordance with the operation of the drive unit. For this reason, the powder lubricant supplied to the injection member by air conveyance by the lubricant supply device is sprayed outside the cylinder through the injection hole when the spray opening is opened, and this spray is closed at the peripheral wall portion. When it stops. Therefore, the powder lubricant can be adhered to the target site only by the necessary time by intermittent spraying of the powder lubricant.

  In a preferred form of the powder lubricant spraying device of the present invention, the spray holes are opened at two positions 180 degrees apart from the cylinder, and the spray ports are opened at two positions above and below the spray member 180 degrees. is doing.

  In this preferred invention, each time the drive unit rotates one of the injection member and the cylinder by 180 degrees, the powder lubricant is sprayed simultaneously above and below the cylinder with the injection hole and the spray port facing each other. Therefore, it is suitable for attaching the powder lubricant to the upper and lower punches and the die of the rotary powder compression molding machine at the same time.

  In order to solve the above-mentioned problems, the rotary powder compression molding machine of the present invention uses a powder material supplied to the inside of a mortar attached to the rotating disk, and an upper and lower iron attached to the rotating disk. And a rotary powder compression molding apparatus that repeats a series of operations by discharging the compression molding product pushed out of the die by the lower punch to the outside of the rotating disk, by rotating the rotating disk, The powder lubricant according to claim 1 or 2, wherein a powder lubricant is sprayed into the tip surface of the upper punch, the tip surface of the lower punch, and the die before supplying the powder material to the inside of the die. An injection device, and a synchronous control means for synchronizing the spraying operation of the powder lubricant injection device with the rotational speed of the rotating disk.

  In the present invention, the spray port can be opened and closed at the injection hole and the peripheral wall portion continuous in the circumferential direction of the cylinder with respect to the hole by the relative rotation of the cylinder and the injection member in accordance with the operation of the drive unit. For this reason, the powder lubricant supplied to the injection member by air conveyance by the lubricant supply device is sprayed outside the cylinder through the injection hole when the spray opening is opened, and this spray is closed at the peripheral wall portion. When it stops. In addition, since the spraying operation is synchronized with the rotation speed of the rotating disk by the synchronization control means, the upper arm, the lower arm and the die rotated together with the rotating disk appropriately receive the spray from the powder lubricant injection device. The powder lubricant can be sprayed from the injection holes in time when moved into position. Therefore, by such intermittent spraying, the powder lubricant can be adhered to the upper punch, the lower punch, and the hole of the mortar only when necessary.

According to the present invention, the spraying port of the injection member is closed by the cylinder except during the spraying of the powder lubricant by the relative rotation of the cylinder having the injection hole and the injection member disposed inside the air curtain. For example, a structure for generating air pulsation waves is not necessary. For example, powder to a target part such as a tip surface of an upper arm, a tip surface of a lower arm, or a mortar hole provided in a rotary powder compression molding apparatus. It is possible to provide a powder lubricant injection device having a simple configuration that can reliably supply the lubricant while suppressing wasteful scattering of the powder lubricant. Rotating type equipped with a powder lubricant injection device with a simple configuration that can reliably supply the powder lubricant to the tip of the lower armpit and the mortar while suppressing unnecessary scattering of the powder lubricant A powder compression molding machine can be provided.

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

  6 indicates a rotary powder compression molding machine (hereinafter abbreviated as molding machine P) that functions as a so-called rotary tableting machine. The molding machine P includes a rotary powder compression molding apparatus 1 (hereinafter abbreviated as a molding apparatus 1), a powder lubricant injection apparatus 2 (hereinafter abbreviated as an injection apparatus 2), and synchronous control means such as synchronous control. The apparatus 3 and the lubricant collection | recovery apparatus 4 (it abbreviates as the collection | recovery apparatus 4 hereafter) are comprised.

  The turntable 5 provided in the molding apparatus 1 is rotated by a driving device (not shown). The turntable 5 has a mortar mounting portion 5a, an upper heel mounting portion 5b facing the upper surface of the mortar mounting portion 5a, and a lower heel mounting portion 5c facing the lower surface of the mortar mounting portion 5a. A large number of mortars 6 are mounted at equal intervals on the mortar mounting portion 5a, positioned on a circle drawn by a radius centered on the rotation center of the rotating disk 5. The mortar 6 functions as a mold body, and has a mortar hole for forming the outer shape of a compression molded product such as a tablet at the center.

  Although not shown, a scraper and a powder feeder are arranged on the mortar mounting portion 5a. The scraper functions as a discharge means for the compression molded product. The powder feeder is provided so that the opened lower surface is closed by the upper surface of the mortar mounting portion 5a. This powder feeder is appropriately replenished with a powder material from a fixed quantity feeder provided in a raw material hopper (not shown), and the powder material in the replenished powder feeder has been fluidized and moved directly below the powder feeder. It is supplied to the mortar of the mortar 6.

  The upper punch guide holes 5b have the same number of upper punch guide holes as the die 6 and the same arrangement as the die 6 are vertically penetrated, and each of these upper punch guide holes functions as an upper punch. A flange 7 is slidably attached in the vertical direction. These upper rods 7 are moved up and down by an upper cam (not shown) as the turntable 5 rotates.

  The lower punch mounting part 5c has the same number of lower punch guide holes as the die 6 and the same arrangement as the die 6 extending in the vertical direction, and each of these lower punch guide holes functions as a lower punch. 8 is attached so as to be slidable in the vertical direction. The tip portions of these lower punches 8 are inserted into the corresponding mortar holes of the mortar 6 to form the bottom of the mortar hole. Each lower rod 8 is moved up and down by various lower rod guide tracks (not shown) as the turntable 5 rotates.

  The upper punch 7 and the lower punch 8 arranged corresponding to the vertical direction are moved in the axial direction so that the tip portions thereof are close to each other at the compression molding position, and the powder material filled in the die 6 is made. Perform compression molding. For this purpose, an upper roll (not shown) that pushes down the upper collar 7 and a lower roll (not shown) that pushes up the lower collar 8 are arranged at the compression molding position.

  The powder feeder with the weighing of the powder material into the die 6 as the lower punch 8 is moved up and down in the lower guide guide orbit when the die 6 passes the lower side of the powder feeder by the rotation of the turntable 5. Filling is completed. Next, after the tip of the upper punch 7 is inserted into the die 6 filled with the powder material, the die 6 is moved to the compression molding position, and the upper roll and the lower roll arranged at this position, The upper punch 7 and the lower punch 8 are moved so as to approach each other, and the powder material in the die 6 is compression molded. After this molding, the upper punch 7 is lifted by the upper cam and pulled out above the die 6 and the lower punch 8 is pushed up by the lower guide guide track, so that a compression molded product such as a tablet is placed on the upper side of the die 6. Extruded. Then, the compression molding product on the lower rod 8 is removed and discharged to the outside of the rotating disk 5 by a scraper that allows the lower rod 8 to pass through the tip. 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 5 continues.

  In FIG. 6, reference numeral 9 indicates a rotational position sensor, and reference numeral 10 indicates an origin position sensor. The rotational position sensor 9 generates a rotational position signal such as a pulse signal for detecting the rotational position of the turntable 5. For example, a pulse generator or a rotary encoder can be used as the rotational position sensor 9. The origin position sensor 10 is a sensor that detects an origin, such as a single notch, provided on the periphery of the turntable 5, for example.

  As shown in FIG. 6, the injection device 2 includes a cylinder 21, an injection member 25, a drive unit 31, and a lubricant supplier 35. As shown in FIGS. 1 to 5, the cylinder 21, the injection member 25, and the drive unit 31 constitute an injection unit 11 that forms a main part of the injection device 2. The injection unit 11 is installed at a position between the molded product take-out position where the scraper is installed and the powder supply position where the powder feeder is installed, that is, at the lubricant spraying position. The lower surface of the case 13 is in slight contact with the mortar mounting portion 5a.

  The injection unit 11 includes a unit case having a main body case 12 assembled from a plurality of case members and a dust suction case 13 connected thereto. The injection unit 11 is attached to a fixing member (not shown) via an attachment member 14 such as a screw that passes through an attachment seat 12 a that projects from both side surfaces of the main body case 12. By this attachment, the tip side portion of the dust suction case 13 intersects with the rotational locus of the die 6 and is disposed on the die attachment portion 5a. The fixing member is disposed in the vicinity of the mortar mounting portion 5a. As shown in FIG. 3, the main body case 12 includes a rotating sleeve 16 that is rotatably supported by the bearing 15.

  As shown in FIG. 2, the dust suction case 13 has a lower surface opened and an exposure hole 17 (see FIG. 1) on the upper wall. A support hole 13 b is provided in the end wall 13 a of the dust collection case 13 that is away from the main body case 12. A sealing material 18 (not shown in FIG. 2 is omitted) is attached to the dust-absorbing case 13 along the edge of the lower surface opening. The sealing material 18 is slightly in contact with the upper surface of the die attaching portion 5b by attaching the injection unit 11 to a fixing member (not shown) via the attaching member 14.

  The cylinder 21 has a large-diameter cylindrical portion 21b and a small-diameter cylindrical portion 21c at the intermediate position in the longitudinal direction with the stepped portion 21a as a boundary. The cylinder 21 has the small-diameter cylindrical portion 21c penetrated through the rotating sleeve 16 and is integrated with the rotating sleeve 16 by a nut 19 that is screwed into the small-diameter cylindrical portion 21c and sandwiches the rotating sleeve 16 between the stepped portion 21a. It is connected so as to rotate. The large-diameter cylindrical portion 21b is accommodated in the dust-absorbing case 13, and the opened tip is close to the end wall 13a with a narrow intake gap g1 provided between the end-wall 13a. Further, as shown in FIG. 2, the upper portion of the large-diameter cylindrical portion 21 b is disposed so as to close the exposure hole 17 and is exposed to the outside of the dust suction case 13 so as to be seen from above.

  As shown in FIGS. 3 and 7, one or more, for example, a plurality of injection holes 22 are opened in the large-diameter cylindrical portion 21 b. These injection holes 22 are provided at equal intervals in the circumferential direction of the large-diameter cylindrical portion 21b. In the case of this embodiment, the two injection holes 22 are opened at two positions separated by 180 degrees of the large-diameter cylindrical portion 21b. ing. These injection holes 22 are provided on the distal end side of the large-diameter cylindrical portion 21 b so as to face the exposure hole 17 by the rotation of the cylinder 21, so that the tip surface of the upper punch 7 and the die are rotated by the rotation of the cylinder 21. 6 is located on the rotational trajectory of the mortar 6 so as to face the mortar surface of the mortar 6 and the tip surface of the lower heel 8. In FIG. 7, reference numeral 24 indicates a peripheral wall portion that is continuous with the injection hole 22 in the circumferential direction of the cylinder 21. The peripheral wall portion 24 is used as a shutter portion that closes a spout described later with the rotation of the cylinder 21. As shown in FIGS. 3 and 4, a plurality of dust suction holes 23 are opened at intervals in the circumferential direction at a portion of the large-diameter cylindrical portion 21 b on the small-diameter cylindrical portion 21 c side.

  As shown in FIG. 3 and the like, the injection member 25 is formed by screwing an inlet pipe 27 into one end portion of a conduit 26 and screwing an injection head 28 into the other end portion of the conduit 26. The injection member 25 penetrates the inside of the cylinder 21 in the axial direction, its inlet pipe 27 is supported by the case member 12 b of the main body case 12, and the injection head 28 is supported by the support hole 13 b of the dust suction case 13.

  The diameter of the end of the inlet tube 27 inserted into the rotating sleeve 16 is slightly smaller than the inner diameter of the rotating sleeve 16. The ejection head 28 has a circular large-diameter portion 28a disposed in the large-diameter cylindrical portion 21b, and the diameter of the large-diameter portion 28a is slightly smaller than the inner diameter of the large-diameter cylindrical portion 21b. A gap g2 is formed. Therefore, the gap G formed between the cylinder 21 and the injection member 25 communicates with the intake gap g1 via the gap g2. Further, the gap G communicates with the dust suction hole 23.

  The ejection head 28 is provided with a T-shaped passage 29. The passage 29 is formed by a central passage portion extending in the axial direction of the ejection head 28 and a plurality of, for example, two spray ports 29a provided radially around the passage portion. The central passage portion communicates with the conduit 26. The two spray ports 29a are provided at two upper and lower positions separated by 180 degrees, communicate straightly in the vertical direction, and are opened at the upper end portion of the outer peripheral surface and the lower end portion of the outer peripheral surface of the large-diameter portion 28a, respectively. . These spray ports 29 a can face the injection hole 22 of the rotated cylinder 21 and the peripheral wall portion 24 between the adjacent injection holes 22. Therefore, the spray port 29 a is opened and closed by the injection holes 22 and the peripheral wall portions 24 that are alternately positioned along the circumferential direction of the rotating cylinder 21.

  The drive unit 31 is attached to the main body case 12. The drive unit 31 includes a drive motor 32 and a transmission mechanism 33.

  The drive motor 32 can be an electric motor, preferably a servo motor. When a servo motor is used, control such as forward rotation, reverse rotation, and rotation stop at a predetermined angle is possible. A motor shaft 32 a of the drive motor 32 is connected to the rotary sleeve 16 via a transmission mechanism 33. The transmission mechanism 33 incorporated in the main body case 12 includes, for example, a gear transmission mechanism, and is connected to the large gear 33a connected to the motor shaft 32a and the rotary sleeve 16 via a rotation prevention key 34 as illustrated in FIG. The large gear 33a and the small gear 33b are meshed with each other. Since the rotary sleeve 16 is rotated by the operation of the drive unit 31, the cylinder 21 integrated with the rotary sleeve 16 can be rotated simultaneously.

  A lubricant supply device 35 shown in FIG. 6 is disposed outside the molding apparatus 1. The lubricant supply device 35 sprays a powder lubricant supplied from a hopper storing a powder lubricant such as magnesium stearate powder with air and adjusts the powder lubricant to a predetermined concentration to the injection member 25 by air conveyance. Supply continuously. For this purpose, the supply end 35a of the lubricant supplier 35 is connected to the inlet pipe 27 via a connection block 37 as shown in FIG.

  The dust-absorbing case 13 also functions as a lubricant recovery device, and the inside thereof communicates with the gap G through a dust-absorbing hole 23. Further, the dust suction case 13 has a dust suction port 13c. The dust suction port 13 c is provided along the upper outer periphery of the large-diameter cylindrical portion 21 b of the cylinder 21. The tip of the upper lid 7 that passes through a predetermined height position that does not interfere with the dust suction case 13 at the lubricant spray position is opposed to the dust suction port 13c.

  The collection device 4 shown in FIG. 6 is disposed outside the molding device 1. The recovery device 4 includes a recovery tank 42 in which a filter 41 is built, and a blower 43 connected to an outlet 42 a of the recovery tank 42. An inlet 42 b of the recovery tank 42 is communicated with the inside of the dust suction case 13 via a recovery pipe 44. Reference numeral 45 in FIG. 6 indicates a differential pressure gauge that detects a differential pressure between the internal pressure of the recovery tank 42 and the pressure on the outlet 42a side with the filter 41 as a boundary. A differential pressure greater than a predetermined level is detected. At times, the operation of the lubricant supplier 35 or the molding apparatus 1 is stopped via a control unit (not shown).

  Output signals of the rotational position sensor 9 and the origin position sensor 10 are input to the synchronization control device 3. The synchronization control device 3 can know the rotational position of the rotating disk 5 by counting the output pulse signal of the rotational position sensor 9 from the time when the output signal of the origin position sensor 10 is input thereto. Thus, the synchronous control device 3 can know whether or not the upper punch 7, the mortar 6 and the lower punch 8 paired in the vertical direction have reached the lubricant spraying position indicated by the middle position in FIG. Along with this, the synchronization control device 3 controls the drive of the drive motor 32 of the drive unit 31 in accordance with the rotational speed and the number of rods of the turntable 5, so that the upper punch 7, die 6 and lower When the rod 8 is moved to reach the lubricant spraying position shown in the middle position in FIG. 7, the pair of injection holes 22 are synchronized so that the pair of injection holes 22 face in the vertical direction at the same timing. The rotation is controlled.

  When the molding device 1 of the molding machine P having the above configuration is operated and the compression molding operation described above is performed, the injection device 2, the synchronous control device 3, and the recovery device 4 are also operated. By the operation of the injection device 2, a powder lubricant of a predetermined concentration is supplied from the lubricant supply device 35 by air conveyance to the fixed injection member 25, and this powder lubricant fills the passage 29 in the injection head 28. . At the same time, as the drive motor 32 of the drive unit 31 is driven, the cylinder 21 is rotated via the transmission mechanism 33. Therefore, each time the cylinder 21 rotates 180 degrees, the one injection hole 22 is directed upward. At the same time as this spraying port 29a is opened, the other spray hole 22 is opened facing this downward spraying port 29a. When the spray port 29a is opened, the powder lubricant in the spray member 25 is sprayed from the spray port 29a by its own air pressure and sprayed upward or downward through the facing spray hole 22. .

  In this case, as described above, the servo motor drive motor 32 is controlled by the synchronous control device 3 in synchronism with the rotation speed of the rotating disk 5, and the upper punch 7, the die 6 and the lower pair that are paired in the vertical direction are controlled. When the rod 8 reaches the lubricant spray position shown in the middle position in FIG. 7, the rotation of the cylinder 21 is controlled in synchronization so that the pair of injection holes 22 face the vertical direction at the same time. . For this reason, the powder lubricant sprayed through the upwardly directed injection hole 22 is sprayed onto the tip surface of the upper punch 7 and at the same time, the powder lubricant sprayed through the downwardly directed spray hole 22. The agent is sprayed on the mortar of the mortar 6 and the tip of the lower heel 8.

  As described above, when the upper punch 7, the die 6 and the lower punch 8 to which the powder lubricant is attached are displaced from the lubricant spray position and come off, the peripheral wall portion 24 of the cylinder 21 that continues to rotate is turned upward. Since the spray ports 29a are immediately opposed to the spray ports 29a and the downward spray ports 29a, the spraying of the powder lubricant is stopped.

  This spray stop is performed by the upper punch 7, the mortar 6 and the lower punch 8 (in FIG. 7, the rotary disc 5 is a pair) in the vertical direction that is the next lubricant supply target adjacent to the upstream side of the rotary disc 5 in the rotational direction. For example, if it is rotated in the right direction, the upper arm 7, the mortar 6 and the lower arm 8 on the left side are the next lubricant supply objects)) until the lubricant spray position is reached. The Then, when the upper jaw 7, the die 6 and the lower jaw 8 that are paired in the vertical direction as the next lubricant supply target reach the lubricant spraying position, the spraying port 29 a is opened again at a timing corresponding to that. Spraying is performed synchronously.

  As described above, although the powder lubricant is continuously supplied from the lubricant supply device 35 to the injection member 25 by air conveyance, the lubricant supply target is paired in the vertical direction. When the punch 7, the mortar 6 and the lower punch 8 reach the lubricant spray position, that is, the upper and lower spray ports 29a are intermittently opened, and the powder lubricant is sprayed simultaneously in the vertical direction. By such intermittent pinpoint spraying, it is possible to spray the powder lubricant onto the upper punch 7, the mortar 6 and the lower punch 8 that have reached the lubricant spray position, and to adhere the powder lubricant reliably.

  The period from the pinpoint spray of the powder lubricant until the upper lubricant 7, the die 6 and the lower arm 8 that are paired in the vertical direction as the next lubricant supply target reaches the lubricant spray position. Since the upper and lower spray ports 29a are closed and the spraying is stopped, it is possible to prevent the powder lubricant from being sprayed and scattered around during this period.

  However, a part of the powder lubricant sprayed upward is slightly scattered through the gap g2 into the inside of the cylinder 21 and also scattered around the tip of the upper collar 7. Similarly, a part of the powder lubricant sprayed downward is slightly scattered inside the cylinder 21 through the gap g2 and also scattered between the lower part of the cylinder 21 and the mortar mounting portion 5a.

  In this case, the collection device 4 is operated as described above, and the internal space of the dust suction case 13 and the gap G communicating with this space through the dust suction holes 23 are under negative pressure. As a result, a suction airflow is formed in the cylinder 21 from the air gap g1 through the gap g2 into the air gap G and then through the air suction hole 23 and into the dust suction case 13. For this reason, the powder lubricant is prevented from scattering outside the dust suction case 13 through the gap g2.

  Further, when the dust suction hole 23 faces downward due to the rotation of the cylinder 21, the dust suction hole 23 is formed between the upper surface of the mortar mounting portion 5 a facing the region partitioned by the sealing material 18 and the outer peripheral surface of the lower portion of the cylinder 21. Are sucked into the cylinder 21. As a result, the powder lubricant scattered in the region partitioned by the sealing material 18 is also prevented from scattering to the outside of the dust absorbing case 13.

  Further, as the inside of the dust suction case 13 becomes negative pressure, the dust suction port 13 c sucks air near the upper outer peripheral surface of the cylinder 21. Thereby, the powder lubricant scattered around the tip portion of the upper rod 7 can be sucked into the dust suction case 13. The powder lubricant sucked into the dust suction case 13 through each of the above paths is sucked into the recovery tank 42 through the recovery pipe 44, separated from the air by the filter 41, and recovered in the recovery tank 42. The

  As described above, since the powder lubricant that is slightly scattered with the intermittent pinpoint spray described above can be efficiently collected, it is possible to prevent the rotating disk 5 and the like from being soiled by the scattered powder lubricant.

  In addition, as described above, since the outside air is sucked into the gap G from the intake gap g1 through the gap g2, the outside air suction from the injection hole 22 can be suppressed. For this reason, there is no possibility that spraying of the powder lubricant passing through the injection hole 22 due to dust absorption will be hindered, and pinpoint spraying can be performed reliably.

  The injection device 2 configured as described above rotates the cylinder 21 by the drive unit 31 while continuously conveying the powder lubricant to the injection member 25 having the spray port 29a by the lubricant supplier 35 as described above. By doing so, the spray port 29a is opened and closed by the cylindrical injection hole 22 and the peripheral wall part 24, and the powder lubricant is sprayed to the target part by intermittent pinpoint spray.

  Thereby, a predetermined area is divided to prevent the scattering of excess powder lubricant, or an air curtain or the like, or a pulsation wave generator for diffusing the powder lubricant supplied to the inside in the predetermined area Therefore, the facility is simple and easy to implement.

  Further, since the outer cylinder 21 is rotated with respect to the fixed injection member 25, the rotation of the cylinder 21 is easily increased by increasing the rotation of the drive motor 32 when performing pinpoint spraying. Can be For this reason, even if it is the shaping | molding apparatus 1 with which the turntable 5 rotates at high speed, a powder lubricant is sprayed on the upper punch 7, the mortar 6 and the lower punch 8 which were moved to the lubricant spray position. Can be attached.

  In addition, a servo motor is used as the drive motor 32, and the drive of the drive motor 32 is controlled by the synchronization control device 3, so that the pinpoint spray is synchronized with the rotational speed of the rotating disk 5. In this case, even if the rotational speed of the rotating disk 5 is different for each molding apparatus 1 in which the injection device 2 is installed, the rotational speed of the cylinder 21 (rotating at a predetermined speed) and the rotational mode (at a constant speed). The pinpoint spraying operation can be synchronized with the rotation speed of the rotating disk 5 by controlling the rotation of the rotating disk 5 or the intermittent rotation. Therefore, it is easy to adjust the spray timing suitable for the rotation speed and the number of powers of the turntable 5, and an appropriate pinpoint spray can be realized.

  8 and 9 show a second embodiment of the present invention. Since this embodiment is the same as the first embodiment except for the items described below, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In 2nd Embodiment, the outer peripheral surface of the large diameter part 28a of the injection head 28 and the inner peripheral surface of the large diameter cylinder part 21b of the cylinder 21 in which this large diameter part 28a was accommodated are made to contact. For this reason, there is no gap between them, and the cylinder 21 is rotated while sliding with respect to the outer peripheral surface of the large diameter portion 28a. In this case, seal rings such as an O-ring made of a sealing material having excellent lubricity are provided on the outer peripheral surface of the large-diameter portion 28a so as to be positioned on both sides of the spray port 29a with respect to the axial direction of the ejection head 28. Alternatively, the inner peripheral surface of the cylinder 21 that is rotated may be slid.

  By adopting this configuration, the amount of powder lubricant sprayed from the spray port 29a can be further reduced. Also in the second embodiment, the cylinder 21 is rotated by the driving unit while continuously conveying the powder lubricant from the lubricant supplier to the injection member 25 having the spraying port 29a by the driving unit. Since the spray hole 29a is opened and closed by the injection hole 22 and the peripheral wall portion 24, and the powder lubricant is sprayed to the target portion by intermittent pinpoint spraying, the problem of the present invention can be solved.

  The present invention is not limited to the above embodiments. For example, intermittent pinpoint injection may be performed by fixing the cylinder 21 and rotating the injection member 25 by the drive unit. In this case, the cylinder 21 may be provided with an upward injection hole 22 and a downward injection hole 22, and the injection member 25 may be provided with one or more spray ports. In addition, when there is one injection port, it can be suitably implemented as a powder lubricant injection device installed in a low-speed rotary powder compression molding machine. Moreover, when there is one injection port, it is preferable in that there is no variation in the spray amount of the powder lubricant.

  Further, the opening shape of the injection hole 22 and the spraying hole 29a may be the same or different, and the upper punch 7, the mortar 6 and the lower punch that are paired in the vertical direction as the lubricant supply target. According to the shape of 8, it can be changed as appropriate, for example, a slit shape or a plurality of small holes provided in a predetermined region.

The perspective view which shows the injection unit of the powder lubricant supply apparatus which concerns on 1st Embodiment of this invention. The perspective view shown in the state which reversed the injection unit of FIG. 1 up and down. Sectional drawing which shows the injection unit of FIG. Sectional drawing which follows the F4-F4 line | wire in FIG. Sectional drawing which follows the F5-F5 line | wire in FIG. FIG. 2 is a schematic cross-sectional view showing a part of a rotary powder compression molding machine provided with the powder lubricant supply device of FIG. 1. Sectional drawing of the rotary-type powder compression molding machine which passes along the F7-F7 line | wire in FIG. Sectional drawing which shows a part of powder lubricant supply apparatus which concerns on 2nd Embodiment of this invention. Sectional drawing of the rotary-type powder compression molding machine which passes along F9-F9 line | wire in FIG.

Explanation of symbols

P ... Rotary powder compression molding machine, 1 ... Rotary powder compression molding apparatus, 2 ... Powder lubricant injection apparatus, 3 ... Synchronous control apparatus (synchronous control means), 4 ... Lubricant recovery apparatus, 5 ... Rotary plate 5 ... A mortar mounting part, 6 ... A mortar, 7 ... Upper punch, 8 ... Lower punch, 9 ... Rotation position sensor, 10 ... Origin position sensor, 11 ... Injection unit, 12 ... Body case, 13 ... Dust absorption case, 13a ... Dust inlet, 16 ... rotating sleeve, 17 ... exposure hole, 21 ... cylinder, 22 ... injection hole, 23 ... dust inlet, 24 ... peripheral wall part, 25 ... injection member, 28 ... injection head, 28a ... large diameter part, 29 ... Passage, 29a ... spray port, g2 ... gap, 31 ... driving unit, 32 ... drive motor, 33 ... transmission mechanism, 35 ... lubricant feeder

Claims (3)

A cylinder with injection holes;
A spray that is disposed in the cylinder and that opens and closes at the peripheral surface that contacts or is close to the inner peripheral surface of the cylinder and is opened and closed at the injection hole and a peripheral wall portion that is continuous with the hole in the circumferential direction of the cylinder. An injection member that has a mouth and sprays the powder lubricant from the spray hole through the injection hole;
A drive unit for rotating one of the injection member and the cylinder;
A lubricant supplier for supplying a powder lubricant to the spray member by air conveyance;
A powder lubricant injection device comprising:   2. The powder lubricant injection device according to claim 1, wherein the injection holes are opened at two positions 180 degrees apart of the cylinder, and the spray ports are opened at two upper and lower positions separated by 180 degrees of the injection member. A compression molding product in which the powder material supplied to the inside of the die attached to the rotating disk is compression-molded by bringing the upper and lower eyelids attached to the rotating disk close to each other and is pushed out of the die by the lower eyelid. A rotary powder compression molding apparatus that repeats a series of operations of discharging the outside of the rotating disk by the rotation of the rotating disk;
The powder lubricant according to claim 1 or 2, wherein a powder lubricant is sprayed into the tip surface of the upper punch, the tip surface of the lower punch, and the die before supplying the powder material to the inside of the die. An agent injection device;
Synchronous control means for synchronizing the spraying operation of the powder lubricant injection device with the rotational speed of the rotating disk,
A rotary powder compression molding machine.

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