JP4601078B2 - Powder removal apparatus and method for compression molded products - Google Patents

Description

  The present invention relates to a powder removal apparatus and method for a compression molded product that removes powder adhering to the surface of a compression molded product such as a tablet formed by compressing powder by blowing compressed air onto the compression molded product. .

  For example, the powder inevitably adheres to the surface of a tablet molded by a tableting machine due to static electricity generated during compression molding of the powder raw material or due to the physical properties of the powder raw material having high adhesion and cohesion. .

  Therefore, conventionally, a technique for removing powder adhering to a compression molded product such as a tablet by spraying compressed air is known (for example, see Patent Documents 1 and 2).

  In the technique of Patent Document 1, a plurality of fluid agitating chambers having an upper tablet inlet opened and closed by an upper shutter and a lower tablet outlet opened and closed by a lower shutter are inserted into the agitating chamber, and the like. By ejecting air from the air ejection tube, the tablets placed in a batch in the flow agitating chamber are given a flow agitating action in which the flow directions in the flow agitating chamber are opposite to each other. The dropped powder is sucked and removed out of the fluidized stirring chamber by an air suction device.

In the technique of Patent Document 2, the granular material with powder introduced from the lower end side of the pressure feed pipe that extends vertically and is vertically arranged is compressed by pressurized air that is caused to flow from the lower end side of the pressure feed pipe by the pressure feeding means. Pressurize upward, depressurize the pressurized air in the decompression chamber provided at the upper end of the pumping tube to separate particles and powder, and install in the decompression chamber so as to intersect the rising pressurized air flow While the powder passing through the separation plate is sucked and collected through a suction tube passing through the central part of the pressure feeding tube, the particles that cannot pass through the separation plate are dropped by their own weight into the take-out port connected to the decompression chamber. To be discharged.
Japanese Patent No. 3426857 (paragraphs 0008-0036, FIGS. 1-6) International Publication No. W02004 / 028711 (page 7, line 6 to page 9, line 50, FIGS. 1-7)

  In the technique of Patent Document 1, not only a long time is required to sufficiently stir the tablet group stored in a batch in the fluid stirring chamber, but only the suspended powder is sucked. And the powder separated by stirring drops not a little, and since it is taken out from the lower tablet discharge port together with the tablet after the stirring process, the reliability of powder removal is low.

  In the technique of Patent Document 2, since the pressurized air is sprayed only once on the powdered particles only when the pressurized air is sprayed to the lower end of the pumping tube, the reliability of the powder removal is low. . Moreover, since the pressurized air is pumped upward in the pumping tube at a flow rate and flow velocity sufficient to raise the particles to the decompression chamber, the particles conveyed thereby collide with the separation plate at a considerable speed. . In addition, there are many cases where other particles collide with the particles temporarily attached to the separation plate from below. Thereby, there is a high possibility that the powder will be cracked or chipped.

  An object of the present invention is to provide a highly reliable powder removing apparatus and method for a compression molded product that removes powder adhering to the surface of the compression molded product while suppressing damage to the compression molded product.

  The powder molding apparatus for a compression molded product according to the present invention has an inlet having one end opened in the longitudinal direction, and the longitudinal direction of the compression molded product moved from the inlet toward the outlet on the other end in the longitudinal direction. A separation pipe installed on its side with an inner surface region that guides up and down in a crossing direction; and a plurality of injection nozzles spaced from each other along the longitudinal direction of the separation pipe Injection means for injecting compressed air from these injection nozzles toward the lowest portion of the inner surface area to form an airflow that flows upward along the inner surface area; and the separation at a position continuous above the inner surface area; And a recovery means that has a powder outlet provided along the tangent line of the inner surface of the pipe and sucks air in the separation pipe through the powder outlet.

  In the present invention, the length of the separation tube can be set in the range of 400 mm to 800 mm, for example, and the separation tube may be curved in a horizontal view instead of a straight tube. In the present invention, the outlet of the separation tube preferably uses, for example, an opening at the other end of the separation cylinder facing the inlet, but instead of closing the other end, an opening is provided in the lower surface near the other end. It is also possible.

  In the present invention, the phrase “separately installing the separation tube” naturally includes the case where the separation tube is installed horizontally, but also includes the following forms. When the injection nozzle is provided perpendicular to the longitudinal direction of the separation tube when viewed in plan, the powder molded product in the separation tube cannot move in the separation tube in the outlet direction only by its own weight, and the powder molded product in the separation tube. Includes a mode in which the outlet is lower than the inlet by being inclined at an angle of, for example, 5 ° or less in the forward downward direction so that it can move toward the inlet side with the energy of the compressed air jetted from the jet nozzle. . Similarly, when the injection nozzle is not orthogonal to the longitudinal direction of the separation tube in a plan view and is inclined in the traveling direction of the powder compression molded product, in other words, provided in an inclined manner on the outlet side, the inlet is It includes an aspect in which the inlet is lower than the outlet by being inclined at an angle less than the inclination angle. In addition, when the injection nozzle is inclined in order to give the moving force in the outlet direction to the compression molded product, the inclination angle is an angle between the center line of the injection nozzle and a line perpendicular to the longitudinal direction of the separation tube ( This angle is referred to as a lead angle in this specification.) And is set within a range of 5 ° to 15 °, preferably 8 ° to 12 °.

  In the present invention, the separation tube can be preferably formed by a cylindrical tube, but at least the lower inner surface of the tube is formed of a curved surface, that is, an arcuate surface made of a part of the circumference of a circle or an ellipse, and the outer surface is formed. It includes tubes that are non-circular. In the present invention, the “inner surface region that guides the ascending / descending of the compression molded product” of the separation tube is the upward direction of the compression molded product that is jetted along the direction intersecting the longitudinal direction of the separation tube by the compressed air ejected from the injection nozzle In addition, it refers to a region where the powder molded product slides under its own weight as the squirting action decreases or disappears temporarily, and this region extends over the entire length in the longitudinal direction of the separation tube. Furthermore, the inner surface region can be suitably formed by the curved surface, but it can also be formed by having a slope in part instead.

  In the present invention, the plurality of injection nozzles can be arranged substantially horizontally by opening their nozzle ends at the lowest part of the inner surface area, in other words, the lowest part of the inner surface of the separation tube. It is preferable to arrange it diagonally downward at a higher position. In this latter case, the injection nozzle is provided so as to inject compressed air obliquely downward toward the lowest part, but its angle, that is, the horizontal line and the center line of the injection nozzle when the separation tube is viewed in the axial direction. (This angle is referred to as a blow-down angle in this specification) is set within a range of 5 ° to 45 °, preferably 20 ° to 30 °. In the present invention, the arrangement pitch of the plurality of injection nozzles along the longitudinal direction of the separation tube can be set in the range of 3 mm to 8 mm, and when the compression molded product is a tablet, it is generally less than its diameter. Is preferably 6 mm or less. In the present invention, the opening at the nozzle end of the spray nozzle is not limited to a round hole, but may be a slit-like long hole extending in the longitudinal direction of the separation tube. And when the opening shape of a nozzle end is a round hole, the opening diameter can be set in the range of 1 mm-3 mm.

  In the present invention, the injection means may continuously inject compressed air from the injection nozzle or may inject intermittently. When intermittent injection is performed, the injection of all the injection nozzles may be performed intermittently at the same time, or a plurality of injection nozzle systems that are provided at predetermined intervals, such as every other nozzle, are sequentially switched to change their injection timing. The intermittent injection may be performed by shifting. In the present invention, the compressed air injected from the injection nozzle of the injection means may be compressed air without dehumidifying indoor air, but compresses dry air that has been dehumidified. It is preferable to use it. In the present invention, it is desirable to set the injection pressure of the injection nozzle so that a compression molded product that is moved upward in the inner surface area along with the injection does not reach the powder outlet located above the inner surface area. .

  In the present invention, when the partition member is provided in the separation tube, the powder outlet of the recovery means can be formed between the side edge of the partition member and the inner surface of the separation tube along the tangent line of the inner surface, When the partition member is not used, the partition member can be formed so as to penetrate the tube wall. In this invention, the collection | recovery means may have another powder exit in the position different from the powder exit provided so that the said tangential direction may be followed. When providing this another powder outlet, in the application to the structure which provided the partition member in the separation pipe, this can be penetrated to a partition member and the said another powder outlet can be provided. In addition, in application to a configuration not using the partition member, the separate powder outlet can be formed through the tube wall of the separation tube, or a suction tube extending in the axial direction of the separation tube can be provided. It is possible to form the additional powder outlet on the wall of the suction pipe by placing it in the center. The size of the powder outlet provided along the tangent line of the inner surface of the separation tube and the size of the other powder outlet are preferably formed in a shape and size that do not allow a compression molded product such as a tablet to pass through. Further, in the present invention, the intake capacity of the recovery means is determined from the inlet and outlet of the separation pipe in accordance with the intake operation of the recovery means so that it does not leak outside through the inlet and outlet of the separation pipe floating in the separation pipe. It is preferable to set so that the outside air is slightly sucked.

  In the present invention, various sensors for monitoring the operating state of the apparatus, for example, an inlet sensor for detecting clogging of a powder compression molding product around the inlet, and an outlet for detecting clogging of the powder compression molding product around the outlet. A sensor, an air volume sensor for detecting the air volume sucked by the collecting means, a pressure sensor for detecting the pressure of the air sucked by the collecting means, and the like may be additionally provided at predetermined portions. At the same time, in order to further improve the separation performance of the powder from the compression molded product, an electrostatic removal device is applied to the separation tube to remove static electricity by applying a high voltage to the powder compression molded product moving in the separation tube. It is preferable. In addition, the powder removing apparatus of the present invention is disposed near a powder compression molding machine such as an existing rotary tableting machine, and used by receiving a powder compression product such as a tablet taken out from the discharge port of this molding machine. In addition, it is also possible to implement as a form incorporated in a powder compression molding machine.

  Further, the powder removal method for a compression molded product of the present invention includes a plurality of injection nozzles provided at intervals along the longitudinal direction of the separation tube installed sideways and inclined toward the outlet side of the separation tube. The compressed air injected from these toward the lowest portion of the inner surface of the separation tube is repeatedly sprayed onto the compression-molded product with powder supplied into the separation tube through the inlet of the separation tube, and compression molding While separating the powder from the product, forming an air flow that flows upward along the inner surface of the separation tube from the lowest position, the compression molded product, along the inner surface of the separation tube against its own weight After being moved by the airflow in a direction intersecting the longitudinal direction, the airflow is moved toward the outlet while repeatedly sliding down toward the lowest part by its own weight, and the airflow is accompanied by sliding down of the compression molded product. By the separation The powder conveyed upward along the inner surface of the separator is passed through a powder outlet provided along the tangent line of the inner surface of the separation tube, and is sucked and collected outside the separation tube together with the air flow. Yes.

  ADVANTAGE OF THE INVENTION According to this invention, the powder removal apparatus and method for compression molded products with high reliability which remove the powder adhering to the compression molded product surface can be provided, suppressing the damage of a compression molded product.

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

  In FIG. 1 and FIG. 2, reference numeral 1 denotes a dust removing device, and this dust removing device 1 includes a separation tube 2, a partition member 11, an injection means 21, and a recovery means 31.

  The separation tube 2 is formed of a hollow cylindrical tube having a circular cross section in a direction perpendicular to the longitudinal direction, and both ends in the longitudinal direction are opened. The separation tube 2 is made of a transparent synthetic resin material such as a transparent acrylic resin so that the inside of the separation tube 2 can be seen through. One end opening in the longitudinal direction of the separation tube 2 has no inlet 2a. As shown in FIG. 1, the closing block 3 is detachably connected to one end of the separation tube 2 by fitting to the inner periphery of the inlet 2 a. A charging passage 3 a communicating with the inlet 2 a is formed inside the charging block 3. The input passage 3 a is opened at the upper end of the input block 3.

  The other end opening in the longitudinal direction of the separation tube 2 forms an outlet 2b. As shown in FIG. 1, the discharge block 4 is detachably connected to the other end of the separation pipe 2 by being fitted to the outer periphery of the outlet 2 b. A discharge passage 4 a communicating with the outlet 2 b is formed inside the discharge block 4. The discharge passage 4 a is opened at the lower end of the discharge block 4 lower than the separation pipe 2.

  For example, the powder removal apparatus 1 can receive the tablets (powder compression molding product D) discharged sequentially from the molding product outlet of a rotary tableting machine (powder compression molding machine) (not shown). It is used with the upper end of the charging block 3 facing directly under the outlet. The dust removing device 1 is installed on a stand (not shown) so that the separation tube 2 is horizontal. The tablet D discharged by its own weight from the discharge passage 4a of the powder removing device 1 is supplied to the next step, for example, a coating device or a tablet packaging device.

  Of the inner peripheral surface of the separation tube 2, for example, a semicircular region facing a molded product passage space, which will be described later, is used as an inner surface region 2c that guides the elevation of the tablet D that is moved from the inlet 2a toward the outlet 2b. ing. In the case of the present embodiment, the inner surface region 2 c is set so as to occupy a region extending over a half circumference of the separation tube 2.

  As shown in FIG. 5 (A), the partition member 11 is formed by a rectangular flat partition plate 12 and semicircular end plates 13 attached to the upper surfaces of both longitudinal ends of the partition plate 12, respectively. Yes. The partition plate 12 has substantially the same length as the separation tube 2, and the width orthogonal to the longitudinal direction of the partition plate 12 is equal to the inner diameter of the separation tube 2.

  The partition member 11 is disposed in the separation tube 2 so as to be detachable from one end opening in the longitudinal direction. In this case, the partition plate 12 of the partition member 11 is provided not diagonally but obliquely and through the center of the separation tube 2, and the inclination angle of the partition plate 12 is, for example, 30 ° with respect to the horizontal plane. . As shown in FIGS. 1 and 2, the inside of the separation tube 2 is partitioned into a molded product movement space A and a suction space B by the partition plate 12.

  The molded product movement space A is partitioned by the downward side surface of the partition plate 12 and the lower inner peripheral surface of the separation tube 2 facing the partition plate 12, that is, the inner surface region 2c. Therefore, the molded product movement space A facing the inner surface region 2 c is formed so as to extend substantially the entire length of the separation tube 2 in the longitudinal direction. One end of the molded product movement space A opened is communicated with the input passage 3a through the inlet 2a, and the other opened end of the molded product movement space A is communicated with the discharge passage 4a through the outlet 2b. Yes.

  The suction space B is provided above the molded product movement space A. That is, the suction space B is defined by the upward side surface of the partition plate 12 and the upper inner peripheral surface of the separation tube 2 facing the partition plate 12, and is formed so as to extend substantially the entire length in the longitudinal direction of the separation tube 2. Both ends in the longitudinal direction of the suction space B are closed by end plates 13.

  The upper suction space B partitioned by the partition member 11 and the lower molded product movement space A are communicated by the first powder outlet 15 and the second powder outlet 18. The first powder outlet 15 and the second powder outlet 18 form a part of the recovery means 31 described later.

  As shown in FIG. 2, the first powder outlet 15 is formed by a side edge of the partition plate 12 positioned so as to block an upward airflow F described later, specifically, an upward side edge and an inner surface of the separation tube 2. It is formed in between and is provided along the tangent to this inner surface. For this purpose, as shown in FIG. 5 (A), on the upward side edge of the partition plate 12, there are a concave groove 16 opened on the side edge and both side surfaces of the partition plate 12, and a convex portion 17 adjacent thereto. Since they are alternately formed along the longitudinal direction of the partition plate 12, the upward side edges are formed in an uneven shape.

  The first powder outlet 15 is formed by placing the partition member 11 in the separation tube 2 by bringing the tip of the convex portion 17 into contact with the inner surface of the separation tube 2. Accordingly, the first powder outlets 15 are provided at intervals in the longitudinal direction of the separation tube 2. The width of the concave groove 16 in plan view is set to 2 mm, for example, and the width of the convex portion 17 is set to 3 mm, for example. The depth of the concave groove 16, in other words, the protruding length of the convex portion 17 is, for example, 2 mm.

  As shown in FIG. 5 (B), the surface of each convex portion 17 facing the molded product movement space A is formed as an oblique surface that gradually reduces the thickness of the side edge of the partition plate 12, such as a tapered surface 17a. As a result, the inner surface of the separation tube 2 and the lower surface of each convex portion 17 do not form a corner portion that blocks an upward air flow F, which will be described later, substantially perpendicularly thereto. Therefore, it is preferable in that the powder that reaches the tapered surface 17a of the convex portion 17 does not stay with the upward air flow, and can smoothly pass through the adjacent concave grooves 16. Further, as shown in FIG. 5 (B), the tapered surface 17a extends beyond the inner surface of the concave groove 16 below the partition plate 12 so as to attract the airflow passing upward through the concave groove 16. Reached to the side.

  Note that the first powder outlet 15 may be formed by a slit that is provided at least at both ends in the longitudinal direction of the side edge of the partition plate 12 and extends continuously in the longitudinal direction of the partition plate 12 between the projections. it can. In this case, the number of slits may be one or more.

  As shown in FIGS. 1 and 2, the second powder outlet 18 is provided in the partition plate 12. The 2nd powder outlet 18 consists of many small diameter through-holes as FIG. 5 (A) shows. These second powder outlets 18 are provided close to the inlet 2a side of the separation tube 2 as shown in FIG. Here, the inlet 2a side indicates a region extending from 1/3 to 1/2 in the longitudinal direction of the partition plate 12 from the inlet 2a toward the outlet 2b. The second powder outlet 18 is provided with a plurality of slits arranged in the longitudinal direction of the partition plate 12 or in the width direction perpendicular thereto, or in the oblique direction with respect to the longitudinal direction, instead of a large number of small-diameter through holes. May be.

  The injection means 21 includes a plurality of injection nozzles and a control unit 30 that controls the injection operation of compressed air therefrom.

  For each injection nozzle, a plurality of nozzle systems, for example, a plurality of injection nozzles 22 forming a first nozzle system, and a plurality of injection nozzles 23 forming a second nozzle system are used. These injection nozzles 22 and 23 inject compressed air toward the lowest part 2d of the inner surface region 2c of the separation tube 2 and are provided at intervals over the entire length of the separation tube 2 in the longitudinal direction. The lowest part 2d of the inner surface region 2c indicates the vicinity where the perpendicular passing through the center of the separation tube 2 and the inner surface region 2c intersect.

  The specific arrangement of the injection nozzles 22 and 23 will be described in more detail. As shown in FIG. 3, a nozzle block 24 having the same length as the entire length of the separation tube 2 is disposed on the lower outer surface of the separation tube 2. The nozzle block 24 is provided only on one side with a vertical line passing through the center of the separation tube 2 as a boundary. The separation tube 2 can be brought into contact with and separated from the nozzle block 24. For this purpose, the separation tube 2 is detachably connected to the base 25 by a clamp 26 that is manually engaged and disengaged between the connection block 6 attached to a plurality of locations of the separation tube 2 and the base 25 that supports the nozzle block 24. The separation tube 2 and the nozzle block 24 are kept in contact by the connection.

  As shown in FIG. 4, a plurality of injection nozzles 22 are provided at a predetermined interval P1, for example, 12 mm pitch, across the nozzle block 24 and the tube wall of the separation tube 2. The nozzle tips of these injection nozzles 22 are opened to the inner surface of the separation tube 2 so as to be directed to the lowest part 2d of the inner surface region 2c, and the opening diameter thereof is, for example, 2 mm. Similarly, a plurality of injection nozzles 23 are provided at a predetermined interval P1, for example, 12 mm pitch, across the nozzle block 24 and the tube wall of the separation tube 2. The nozzle tips of the injection nozzles 23 are also opened to the inner surface of the separation tube 2 so as to be directed to the lowest part 2d of the inner surface region 2c, and the opening diameter thereof is, for example, 2 mm. Since the injection nozzles 22 of the first nozzle system and the injection nozzles 23 of the second nozzle system are parallel to each other and alternately arranged, the adjacent injection nozzles 22, 23 have a mutual interval P2. It is provided as a 6 mm pitch.

  In order to supply air simultaneously to the injection nozzles 22 of the first nozzle system, the nozzle block 24 is provided with a first air supply passage 27 extending in the longitudinal direction thereof, and this first air supply passage. A plurality of first communication passages 27a are provided for individually connecting the injection nozzles 27 and the respective injection nozzles 22. Similarly, in order to supply air simultaneously to the injection nozzles 23 of the second nozzle system, the nozzle block 24 is provided with a second air supply passage 28 extending in the longitudinal direction thereof. A plurality of second communication passages 28a for individually connecting the air supply passage 28 and the respective injection nozzles 23 are provided. 2 to 4, reference numeral 29 denotes a sealing plug that closes the end of the injection nozzle 22 opposite to the nozzle tip.

  Each injection nozzle 22, 23 has an advance angle α of, for example, 10 ° when viewed in plan as shown in FIG. 4 in order to move the tablet D to the outlet 2 b side by compressed air injected from them. It is provided and inclined toward the outlet 2b. Further, each of the injection nozzles 22 and 23 ejects compressed air obliquely downward with respect to the lowest part of the inner surface region 2c, for example, 25 ° when the separation tube 2 is viewed in the axial direction as shown in FIG. Is inclined with an angle β. In order to obtain the spray angle β, each of the spray nozzles 22 and 23 is disposed obliquely downward at a position higher than the lowest part of the inner surface region 2c.

  Although not shown, the control unit 30 includes various air supply control devices such as a dehumidification processing unit, a compressed air generator, a solenoid valve, and a controller. The dehumidification processing unit takes in indoor air and dehumidifies it into dehumidified air, and this air is compressed by a compressed air generator such as a compressor. The solenoid valve is provided corresponding to each nozzle system individually, and the dehumidified air compressed when they are opened is supplied through a supply pipe (not shown) through the first supply passage 27 and the second supply passage 28. Are supplied simultaneously, selectively or alternately. The controller controls the operation of the various air supply control devices in accordance with an operation command instructed by an operation unit including a touch panel (not shown) provided in the control unit, for example, and injects compressed air with various injection patterns. Can be ejected from the nozzles 22 and 23.

  Various injection patterns are obtained by supplying air to the first air supply passage 27 and the second air supply passage 28 simultaneously, selectively, or alternately. In the case of the present embodiment, intermittent injection is fundamental, and the first and second nozzle systems are shifted from the first injection pattern in which the first and second nozzle systems perform intermittent injection simultaneously and the injection timing is shifted. A second injection pattern for alternately performing intermittent injection is set. These ejection patterns are selected by an instruction from the operation unit. Furthermore, the controller arbitrarily sets the injection time (electromagnetic valve ON time), the injection pause time (electromagnetic valve OFF time), the injection pressure, etc. according to the instruction from the operation unit according to the size, shape, processing amount, etc. of the tablet D. Can be set.

  The collection means 31 includes the first powder outlet 15 and the second powder outlet 18, and a suction dust collector 32 (see FIGS. 1 and 2) communicated with the suction space B. The separation tube 2 is provided with an exhaust port 33 through which air sucked into the dust collector 32 flows out. As a preferred example, the exhaust port 33 is provided at a position facing the second powder outlet 18 as shown in FIG. The total intake flow rate of the dust collector 32 is set to 2.5 to 5.0 times, for example, 3 times the total injection flow rate of the compressed air by the injection means 21. The dust collector 32 performs an intake operation continuously during operation of the dust removing device 1.

  The principle of removing the powder adhering to the tablet D using the powder removing device 1 having the above configuration will be described.

  When the dust removing device 1 is operated, the compressed air dehumidified at the same time is supplied to the first nozzle system and the second nozzle system, for example, under the control of the control unit 30 of the injection unit 21, and the recovery unit 31 dust collectors 32 are operated. The air supply is intermittently performed. Thereby, the compressed air is injected obliquely downward from the plurality of first injection nozzles 22 toward the lowest part of the inner surface of the separation tube 2, that is, the lowest part 2d of the inner surface region 2c facing the molded product moving space A. Further, the compressed air is also injected obliquely downward from the plurality of second injection nozzles 23 toward the lowest part 2d of the inner surface region 2c.

  The compressed air thus sprayed forms an air flow F that flows upward from the lowest portion 2d to the inner surface region 2c. Since this upward air flow F hits the partition member 11 provided to obstruct the flow, it does not swirl along the inner surface of the separation cylinder 2. For this reason, most of the upward airflow F flows into the suction space B from the molded product moving space A through the first powder outlet 15 continuous above the inner surface region 2c. On the other hand, since the air in the suction space B is sucked by the suction force of the dust collector 32, the upward airflow F is easily sucked into the first powder outlet 15. At the same time, the air in the molded product moving space A other than the upward air flow F is sucked into the suction space B through the second powder outlet 18 by the suction negative pressure in the suction space B.

  In this state, the tablet D that has been tableted is supplied to the input block 3 one after another. These tablets D are introduced from the charging passage 3a through the inlet 2a into the molded article moving space A and reach the injection area of the injection nozzles 22 and 23 located closest to the inlet 2a. Air is sprayed directly onto tablet D. For this reason, the powder adhering to the surface of the tablet D is separated from the tablet D by being blown away, and the tablet D is raised along the inner surface region 2c of the separation tube 2 by the upward air flow F. At this time, since the air is sprayed at the advance angle α, the tablet D moves upward on the inner surface region 2c while proceeding obliquely toward the outlet 2b corresponding to the advance angle α.

  In addition, in the case of the present embodiment, the tablet D is not raised beyond the height position of the horizontal line passing through the center of the separation tube 2 at the maximum, due to the balance between the weight of the tablet D and the injection pressure. In other words, the injection pressure is set so as not to reach the height position of the first powder outlet 15. Therefore, the rising tablet D does not collide with the first powder outlet 15 and is not sucked and held as it is.

  Most of the powder E blown off during the injection period as described above is carried on the upward air flow F at a speed higher than that of the tablet D. On the other hand, the upward moving speed of the tablet D, which is much heavier than the separated powder, along the inner surface region 2c is much slower than that of the powder E riding on the upward air flow F. The tablets D that are moved as described above by direct injection of air may be moved while rolling, or the tablets D may collide lightly. For this reason, when a slight burr | flash has generate | occur | produced in the tablet D, this burr | flash is removed and the removed burr | flash is carried on the said upward airflow F. FIG.

  Most of the separated powder E is conveyed by the upward airflow F and is sucked into the suction space B through the first powder outlet 15. In this case, the first powder outlet 15 is provided along the tangent line of the inner surface of the separation tube 2, and the moving direction of the upward air flow F and the suction direction with respect to the first powder outlet 15 are substantially the same, Since the air flow F does not swirl along the inner surface of the separation cylinder 2 as described above, the upward air flow F including the separated powder E can be smoothly transferred to the suction space B without requiring excessive suction force. Can be inhaled.

  Also, the powder E that has floated in the molded product moving space A without riding on the upward air flow F among the powder separated by the direct spraying passes into the suction space B through the plurality of second powder outlets 18. Sucked.

  The powder E, burrs and the like separated from the tablet D and reaching the suction space B as described above are further sucked into the dust collector 32 and separated and collected by the dust collector 32.

  Thereafter, the jet of compressed air from the jet nozzles 22 and 23 is stopped, and the upward air flow F disappears. As a result, as described above, the tablet D moved obliquely upward toward the outlet 2b along the inner surface region 2c according to the advance angle α slides along the inner surface region 2c of the separation tube 2 by its own weight. It falls and reaches the injection area of the compressed air injected from the other injection nozzles 22 and 23 adjacent to the outlet 2b side with respect to the injection nozzle.

  Next, since the compressed air is again ejected from the ejection nozzles 22 and 23 to form the upward air flow F, the powder separation by the direct spraying onto the tablet D and the separated powder E are performed as described above. The contained air is recovered.

  Since such an operation is repeatedly performed by intermittent injection by the injection nozzles 22 and 23, the tablet D reaches the outlet 2b of the separation tube 2 while drawing a zigzag locus when the powder removing device 1 is viewed in plan. , And discharged from the discharge passage 4a of the discharge block 4 to the outside.

  In the above powder removal, the number of sprays directly onto the compressed air against the tablet D can be increased according to the number of spray nozzles, so that the powder adhering to the surface of the tablet D can be removed with high reliability. In this case, even if the surface of the tablet D has a dent such as a stamp and powder adheres to it, there are many opportunities to spray the compressed air into the dent by repeatedly spraying the compressed air. Since it is secured once, it can be reliably removed. In addition, in this embodiment, since there is a period of suspension of injection, most of the tablets D are returned to the lowest part 2d during this period, and as a result, compressed air can be sprayed from a very short distance. Reliability is further improved. Further, unlike the batch type described in Patent Document 1, the above powder removing operation is performed continuously, so that the processing efficiency is high, and the tablet is bitten by the open / close lid like the batch type. There is no fear.

  And since the injection nozzles 22 and 23 of the dust removing device 1 are provided at positions where the compressed air is injected obliquely downward from the position higher than the lowest part 2d of the inner surface region 2c of the separation tube 2 to the lowest part 2d. There are the following advantages.

  In other words, the tablet D sliding down the semicircular inner surface region 2c may move to the side of the injection nozzles 22 and 23 beyond the lowest part as the injection is stopped. In this case, the injection nozzles 22 and 23 It does not move beyond that to the rear (right direction in FIG. 2). In addition, in this embodiment, since the downward side edge of the partition plate 12 is in contact with the inner surface of the separation pipe 2 in the vicinity of the upper side of the injection nozzles 22 and 23, the injection nozzles 22 and 23 are provided even in the presence of the partition plate 12. The movement of the tablet D exceeding is prevented. For this reason, since the tablet D always exists in the injection direction of the injection nozzles 22 and 23 regardless of the elevation along the inner surface region 2c, the compressed air can be reliably sprayed onto the tablet D. On the other hand, in the configuration in which the nozzle opening is positioned at the lowest part 2d of the semicircular inner surface region 2c and the injection nozzles 22 and 23 are arranged along the tangent line of the lowest part 2d, as described above, the injection nozzle Since the compressed air cannot be sprayed until the tablet D that has reached the back beyond 22 and 23 is pushed by another tablet and returns to the spraying area, the performance of powder removal at this point is not preferable. .

  Furthermore, since the lower surface of the convex part 17 which makes the 1st powder exit 15 through which the isolate | separated powder | flour passes is the taper surface 17a, the powder E which is going to pass the 1st powder exit 15 of the convex part 17 The bottom surface does not stop and stay, and the recovery efficiency of the separated powder E is high.

  In addition, as described above, the compressed air injected from the injection nozzles 22 and 23 of the powder removing device 1 that performs powder removal needs to be moved while floating the tablet D against its own weight at the pressure and flow rate. However, the pressure and the air flow rate may be such that the tablet D can be moved upward along the inner surface region 2c of the molded product movement space A. For this reason, even if the tablets D collide with each other when they are moved, it is possible to surely prevent the tablets D from being damaged such as cracks or chips due to their small collision energies.

  In the present invention, the spray pressure of the spray nozzles 22 and 23 can be set so that the tablet D moved along the inner surface region 2c hits the partition plate 12 lightly. Even in this case, since it is not necessary to give the tablet D transfer energy enough to float the tablet D, even if the tablet D hits the partition plate 12, the collision energy is small, and the tablet D is damaged such as cracks and chips. It does not occur. In addition, when the tablet D is burred by such setting of the injection pressure, that is, the tablet D can be lightly hit the partition plate 12 to such an extent that the tablet D is not broken or chipped, this burr is generated. Can be effectively removed with a light collision of the tablet D on the partition plate 12.

  Moreover, since the dust removing device 1 is configured to intermittently inject compressed air, the amount of air to be used is smaller than in the case of continuous injection. Therefore, the energy consumption required for operating the powder removing device 1 can be suppressed. In the present embodiment, the injection nozzles 22 of the first nozzle system and the injection nozzles 23 of the second nozzle system are not intermittently injected at the same time as described above, but the injection timing is shifted. It can also be made. In this case, in addition to obtaining the above-described effects, the amount of air to be used is further reduced, which is preferable in that the energy consumption can be further suppressed.

  In the above-described powder removing operation, the amount of the powder E sprayed into the molded article moving space A with the direct injection of compressed air onto the tablet D is the inlet 2a of the separation tube 2 to which the compressed tablet D is supplied. There are far more on the side than on the exit 2b side. Correspondingly, the powder E spouted as described above through the second powder outlet 18 provided on the inlet 2a side is quickly sucked and collected from the side where it is spouted. In particular, it can be prevented from leaking outside through the charging block 3.

  Furthermore, since the second powder outlet 18 is provided only on the inlet 2a side, the powder E that has been blown up and floated somewhat on the outlet 2b side can be sucked into the second powder outlet 18 side. Thereby, it is possible to prevent the suspended powder E from leaking to the outside through the outlet 2b. On the other hand, when the second powder outlet 18 is provided in the whole area of the partition plate 12, the molded product is moved on the inlet 2a side by suction at the second powder outlet 18 located on the outlet 2b side. As a part of the large amount of powder E sprayed into the space A is sucked toward the outlet 2b, there is a possibility that the powder E leaks to the outside through the outlet 2b.

  In addition, since the molded product moving space A and the suction space B are communicated not only with the first powder outlet 15 but also with the second powder outlet 18, suction concentrates on the first powder outlet 15, It is possible to prevent the tablet D from colliding with the vicinity of the first powder outlet 15 and to prevent the tablet D from being sucked to the first powder outlet 15.

  Further, since the total intake air amount in the collecting means 31 that is continuously operated during powdering is made three times the total air supply (injection) amount of the injection means 21, this air is injected every time compressed air is injected. The powder E thus separated can be prevented from leaking to the outside of the powder removing device 1 even though the powder expands rapidly.

  Further, the input block 3, the separation tube 2, the discharge block 4, the partition member 11, the nozzle block 24, and the like with which the tablet D can come in contact are all stationary members, and a powder removing unit (the whole) comprising these members. 1 is not provided with a structure in which a movable member and a stationary member are combined in a path through which the tablet D passes. Therefore, unlike the case where the movable member and the stationary member are provided, the tablet D is not sandwiched between these members, and the tablet D is not held by the movable member and rubbed against the stationary member. The powder can be removed without causing damage to the tablet D due to the above.

  In addition, since there is no movable member in the dust removing unit, a driving device for driving the movable member is unnecessary, the configuration around the separation tube 2 is simple, and it can be manufactured at low cost. Furthermore, since the separation pipe 2 is a round pipe, cost reduction can be promoted in that the processing for making the separation pipe 2 irregular is unnecessary. In addition, the drive device that drives the movable member may cause malfunction when powder enters, but since it does not have such a device, there is no risk of failure over a long period of time and reliable dust removal. Operation can be guaranteed.

  Furthermore, the components of the input block 3, the separation tube 2, the discharge block 4, the partition member 11, and the nozzle block 24, which constitute a powder removing unit having a simple configuration as described above, are detachable from each other. For this reason, the powder removing unit can be easily disassembled and assembled, and all the parts can be cleaned accordingly.

  6 to 10 show other different embodiments of the present invention. Although these embodiments will be described below, configurations having the same configurations or functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  In the second embodiment of the present invention shown in FIG. 6, instead of the partition member used in the first embodiment, a holder 41 and a suction pipe 45 are used, and the first pipe wall is formed on the upper pipe wall of the separation pipe 2. A powder outlet 15 is provided.

  The first powder outlets 15 penetrate the upper tube wall along the tangential direction of the inner surface of the upper tube wall of the separation tube 2 and are provided at intervals along the longitudinal direction of the separation tube 2. Yes. The holder 41 has an introduction edge 42, and the introduction edge 42 is fixed to the separation tube 2 by making contact with the inner surface of the upper tube wall of the separation tube 2. The holder 41 extends over substantially the entire length of the separation tube 2 in the longitudinal direction.

  The introduction edge portion 42 has a structure in which concave grooves and convex portions are alternately continued like the upward side edge of the partition plate described in the first embodiment, and the concave groove of the introduction edge portion 42 is the first powder. It is in direct communication with the outlet 15. An exhaust port 33 projecting from the outer periphery of the upper tube wall of the separation tube 2 is in direct communication with the first powder outlet 15. Therefore, the upward airflow F formed along the inner surface region 2c by the compressed air being injected from the injection nozzle passes through the first powder outlet 15 from the concave groove of the introduction edge portion 42 and from the exhaust outlet 33. It is sucked by the dust collector 32.

  The holder 41 protrudes toward the center of the separation tube 2, and a suction tube 45 is supported at the protruding end. As a result, the suction tube 45 is disposed at the center of the separation tube 2 so as to extend in the longitudinal direction of the separation tube 2, and at least one end thereof is detachably supported by an input block or a discharge block not shown in FIG. 6. ing. The suction tube 45 has a circular cross section in a direction perpendicular to the longitudinal direction, and the second powder outlets 18 are radially opened on the tube wall. These second powder outlets 18 are provided at intervals in the longitudinal direction of the suction pipe 45, but are preferably provided only on the inlet side of the separation pipe 2. The suction pipe 45 communicates with the dust collector 32 through a pipe (not shown) and is sucked at the same time as the exhaust port 33. Therefore, in the second embodiment, the internal space of the suction tube 45 corresponds to the suction space B, and the entire internal space of the separation tube 2 corresponds to the molded product movement space A.

  Except for the matters described above, the second embodiment is the same as the first embodiment, including the configuration not shown in FIG. And also in this 2nd Embodiment, the same powder removal function as already demonstrated in 1st Embodiment is exhibited, and the subject of this invention can be solved.

  In 3rd Embodiment of this invention shown in FIG. 7, while providing the 1st powder outlet 15 and the 2nd powder outlet 18 in the upper pipe wall of the separation pipe 2, the partition used in 1st Embodiment. Instead of the member, a cover 51 is used.

  The first powder outlet 15 extends along the tangential direction of the inner surface of the tube wall to the upper tube wall of the separation tube 2 located on the opposite side of the nozzle block 24 with a vertical line passing through the center of the separation tube 2 as a boundary. It penetrates the upper tube wall and is provided at intervals along the longitudinal direction of the separation tube 2. The second powder outlet 18 is provided at a position different from the first powder outlet 15 in the upper tube wall of the separation tube 2. These second powder outlets 18 are preferably provided only on the inlet side of the separation tube 2.

  The cover 51 covers the first powder outlet 15 and the second powder outlet 18 and is detachably covered on the outer surface of the upper tube wall of the separation pipe 2. The cover 51 extends over the entire length of the separation tube 2, and both ends in the longitudinal direction are closed. A suction space B is formed between the cover 51 and the outer surface area of the upper tube wall of the separation tube 2 covered by the cover 51, and an exhaust port 33 is provided in the cover 51. Therefore, in the third embodiment, the entire internal space of the separation tube 2 is a molded product movement space A.

  A windshield member 52 is attached to the inner surface of the separation cylinder 2 so as to be continuous with the first powder outlet 15. The windshield member 52 extends over the entire length in the longitudinal direction of the separation tube 2. By this windshield member 2, the upward airflow F formed with the injection of compressed air from the injection nozzles 22 and 23 (the injection nozzle 22 is not shown in FIG. 7) swirls along the inner surface of the separation cylinder 2. This is prevented, and the first powder outlet 15 can be reliably passed.

  Except for the matters described above, the configuration is the same as that of the first embodiment, including the configuration not shown in FIG. And also in this 3rd Embodiment, the same powder removal function as already demonstrated in 1st Embodiment is exhibited, and the subject of this invention can be solved.

  In the fourth embodiment of the present invention shown in FIG. 8, the nozzle blocks 24 are symmetrically installed on both sides with respect to the vertical line passing through the center of the separation pipe 2, and the first air supply of each nozzle block 24. The passage 27 and the second air supply passage 28 communicate with the control unit 30. According to the above configuration, the partition plate 12 of the partition member is disposed substantially horizontally on the upper portion of the separation tube 2. Further, the first powder outlets 15 are respectively provided between both side edges of the partition plate 12 and the inner surface of the upper tube wall of the separation tube 2 along the tangential direction of the inner surface.

  Except for the matters described above, the second embodiment is the same as the first embodiment including the configuration not shown in FIG. And also in this 4th Embodiment, the same powder removal function as already demonstrated in 1st Embodiment is exhibited, and the subject of this invention can be solved.

  Moreover, in the fourth embodiment, compressed air is sprayed from both sides simultaneously or alternately on the boundary of the vertical line passing through the center of the separation tube 2 with respect to the tablet D put into the separation tube 2. Since it is possible to prevent a blind spot from being difficult to blow air on the surface, it is possible to further improve the reliability of dust removal. In addition, when injecting compressed air from both sides alternately, the powder removal operation | movement already demonstrated in 1st Embodiment is performed alternately. Further, when the compressed air is injected simultaneously from both sides, the air currents collide with each other and a large part of the separated powder is blown up, so that the powder is collected mainly by suction from the second powder outlet 18. The configuration in which the nozzle blocks 24 are provided on both sides of the vertical line passing through the center of the separation tube 2 as in the fourth embodiment can also be applied to the third embodiment shown in FIG.

  In the fifth embodiment of the present invention shown in FIG. 9 and FIG. 10, the separation cylinder 2 has one or more, for example, a plurality, for example, two as shown in FIG. Baffles 35a and 35b are provided.

  The baffles 35a and 35b are made of, for example, a semicircular plate as shown in FIG. These baffles 35a and 35b are fixed to, for example, the lower surface of the partition plate 12 of the partition member 11 by adhesion or the like, and the molded product moving space A along the direction intersecting the longitudinal direction of the separation cylinder 2, preferably in the orthogonal direction. Is provided. The baffle 35a upstream from the baffle 35b is disposed closer to the downstream side than the plurality of second powder outlets 18. A baffle 35 b downstream of the baffle 35 a is disposed at the outlet 2 b of the separation cylinder 2. In addition, the baffle should just be arrange | positioned at the exit 2b side site | part of the separation cylinder 2 at least.

  The arcuate edges of the baffles 35a and 35b are opposed to the inner surface region 2c of the separation cylinder 2, and a gap 2g that allows the movement of the tablet (compression molded product) D is formed between them. These baffles 35a and 35b can be formed of a hard material, but are preferably formed of a flexible material, preferably natural rubber or silicon rubber. Making the baffles 35a, 35b from a flexible material can prevent the tablet D from being bitten between the baffles 35a and 35b and the baffle 35a when the tablets reach the gap 2g as a group. , 35b is excellent in that the tablet D can pass through while being prevented from being bitten by flexible deformation, and further, it is possible to prevent cracking and chipping of the tablet D colliding with the baffles 35a, 35b.

  Except for the matters described above, the configuration is the same as that of the first embodiment, including configurations not shown in FIGS. 9 and 10. And also in this 5th Embodiment, the same dust removal function as already demonstrated in 1st Embodiment is exhibited, and the subject of this invention can be solved.

  Moreover, in the fifth embodiment, the flow resistance against the air flowing toward the outlet 2b in the molded article moving space A by the operation of the injection means is given by the baffles 35a and 35b provided in the separation cylinder 2 and injected. It is possible to suppress the passage through the separation cylinder 2 quickly without receiving the resistance that air imposes. In other words, the movement speed of the tablet D from the inlet 2a to the outlet 2b of the separation cylinder 2 can be reduced by the turbulence of air formed mainly in the vicinity of the upstream side of the baffles 35a and 35b. Some tablets may be temporarily moved to the inlet 2a side.

  For this reason, when there is much quantity of the tablet A thrown into the inlet 2a, the time for which compressed air is sprayed on these tablets D can be increased. Further, for example, when the amount of the tablet A put into the inlet 2a is small, such as immediately after the start of the operation of the tableting machine and just before the end of the conveyance, the compressed air injected to the small amount of the tablet Although the tablet conveying force is relatively increased as compared with a case where a large amount of tablets are introduced, it is possible to suppress the tablet D from passing through the separation cylinder 2 quickly by the turbulence of the air. Thus, as the tablet residence time in the separation cylinder 2 is secured, the time for the compressed air to be sprayed on a small amount of the tablet D is secured, and the powder adhering to the tablet D is directly sprayed. It can be separated sufficiently.

  Further, in the present embodiment, the baffle 35a is provided near the downstream side of the second powder outlet 18 in the longitudinal intermediate portion of the separation cylinder 2, so that the baffle 35a is often provided on the inlet 2a side of the separation cylinder 2 in the molded product movement space A. The baffle 35a can prevent the suspended powder E from moving easily toward the outlet 2b of the separation cylinder 2. Accordingly, the suspended powder E can be easily sucked into the suction space B through the second powder outlet 18, so that the powder E can be prevented from leaking from the outlet 2 b of the separation cylinder 2.

  The addition of the baffle employed in the fifth embodiment can be applied to the second and third embodiments as well as the fourth embodiment.

  In application to the second embodiment, the baffle is disc-shaped with a notch that escapes the holder 41, and the baffle is separated by fitting a fitting hole formed in the center of the baffle into the suction pipe 45. What is necessary is just to arrange | position in the pipe | tube 2. At the same time, the upper peripheral surface of the baffle may be brought into contact with the upper inner surface of the separation tube 2, and the lower peripheral surface of the baffle may be opposed to the inner surface region 2c of the branch tube 2 to form a gap 2g therebetween.

  Further, in the application to the third embodiment, the baffle is formed in a disc shape having a notch that escapes the windshield member 52 by fitting a fitting hole formed in the central portion of the baffle into the suction pipe 45. What is necessary is just to arrange | position in the separation tube 2. At the same time, the upper peripheral surface of the baffle may be brought into contact with the upper inner surface of the separation tube 2, and the lower peripheral surface of the baffle may be opposed to the inner surface region 2c of the branch tube 2 to form a gap 2g therebetween.

  The present invention is not limited to the above embodiments. For example, the compressed air may be continuously injected from the injection nozzle. In this case, the tablet D is guided to the inner surface region 2c and moved obliquely upward by an upward airflow formed corresponding to the spraying direction of a certain spray nozzle, but when reaching the inner surface region 2c at a certain height. The tablet D starts to slide along the inner surface region 2c because its own weight is superior to the tablet conveying force of the airflow. In the middle of sliding, the tablet D rides on the upward air flow of the injection nozzle adjacent to the outlet 2b side with respect to the certain injection nozzle, is again guided to the inner surface region 2c, and is moved obliquely upward. And since such operation | movement is repeated, the powder adhering to the tablet D surface can be taken.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal side view schematically showing a powder removal unit of a powder removal apparatus according to a first embodiment of the present invention. Sectional drawing which shows schematically the powder removal apparatus which concerns on 1st Embodiment along the F2-F2 line in FIG. Sectional drawing which shows the structure around the separation pipe of the powder removal unit of FIG. FIG. 4 is a cross-sectional view taken along line F4-F4 in FIG. 3 and partially cut away. (A) is a perspective view which shows the partition member of the powder removal unit of FIG. (B) is an expanded sectional view which follows the F5B-F5B line | wire in FIG. 5 (A). Sectional drawing which shows schematically the dust removal apparatus which concerns on 2nd Embodiment of this invention. Sectional drawing which shows schematically the powder removal apparatus which concerns on 3rd Embodiment of this invention. Sectional drawing which shows schematically the powder removal apparatus which concerns on 4th Embodiment of this invention. The vertical side view which shows schematically the powder removal unit of the powder removal apparatus which concerns on 5th Embodiment of this invention. Sectional drawing which shows schematically the powder removal apparatus which concerns on 5th Embodiment along F10-F10 line | wire in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Powder removal apparatus, 2 ... Separation pipe, 2a ... Separation pipe inlet, 2b ... Separation pipe outlet, 2c ... Separation pipe inner surface area, 2d ... Minimum part of inner surface area, 2g ... Gap, 11 ... Partition member, DESCRIPTION OF SYMBOLS 12 ... Partition plate of a partition member, 13 ... End plate of a partition member, A ... Molding product movement space, B ... Suction space, D ... Tablet (compression molding product), 15 ... First powder outlet, 18 ... Second Powder outlet, 21 ... injection means, 22 ... first injection nozzle, 23 ... second injection nozzle, α ... advance angle of injection nozzle, β ... discharge angle of injection nozzle, 31 ... collection means, 32 ... dust collector, 35 ... Baffle, F ... Airflow, T ... Tablet (powder compression molding product)

Claims (9)

It has an inlet with an opening at one end in the longitudinal direction, and has an inner surface region that guides the elevation of the compression molded product that is moved from the inlet toward the outlet at the other end in the longitudinal direction in the direction intersecting the longitudinal direction. And a separation tube installed on its side;
A plurality of injection nozzles provided at intervals in the separation tube along the longitudinal direction of the separation tube, and compressed air is injected from the injection nozzles toward the lowest portion of the inner surface region to the inner surface region. Jetting means for forming an airflow that flows upward along;
A recovery means that has a powder outlet provided along a tangent line of the inner surface of the separation tube at a position continuous above the inner surface region, and sucks air in the separation tube through the powder outlet;
A powder removing device for a compression molded product. It has an inlet with an opening at one end in the longitudinal direction, and has an inner surface region that guides the elevation of the compression molded product that is moved from the inlet toward the outlet at the other end in the longitudinal direction in the direction intersecting the longitudinal direction. And a separation tube installed on its side;
A partition member provided in the separation tube, wherein the separation tube is partitioned into a molded article moving space extending in the longitudinal direction facing the inner surface region, and a suction space extending in the longitudinal direction without facing the inner surface region; ;
It has a plurality of injection nozzles that are opened in the space for moving the molded product and are provided at intervals in the separation tube along the longitudinal direction of the separation tube, and from these injection nozzles to the lowest portion of the inner surface region Injection means for injecting compressed air toward the inside to form an airflow that flows upward along the inner surface region;
The powder outlet is provided between the inner surface of the separation tube continuous above the inner surface region and the side edge of the partition member so as to communicate the both spaces and along the tangent line of the inner surface. Recovery means for sucking air in the suction space through the outlet;
A powder removing device for a compression molded product. 2. The powder injection port is provided on one side of a vertical line passing through the center of the separation tube, and the powder outlet of the collecting unit is provided on the opposite side of the vertical line from the injection unit. Or the powder removal apparatus for compression molding products of 2.   4. The powder molding apparatus for a compression molded product according to any one of claims 1 to 3, wherein the spray nozzle is disposed at a position higher than a lowest portion of the inner surface region.   5. The powder molding apparatus for a compression molded product according to claim 1, wherein the injection nozzle is inclined so as to move the compression molded product to the outlet side by the airflow. 6. .   The powder injection device for a compression molded product according to any one of claims 1 to 5, wherein the injection means intermittently injects compressed air from the injection nozzle.   The said suction means has another powder outlet provided in the position different from the said powder outlet facing the molded article movement space in the said separation tube to which the said compression molded article is moved. To 6. The powder removing device for a compression molded product according to any one of items 1 to 6.   The baffle is provided at least on the outlet side of the separation tube, and a gap allowing movement of the compression molding product is formed between the baffle and the inner surface region. The powder removal apparatus for compression molded products according to one item. A plurality of spray nozzles provided at intervals and along the longitudinal direction of the separating pipe installed in a horizontal direction and inclined toward the outlet side of the separating pipe are directed toward the lowest portion of the inner surface of the separating pipe. The compressed air injected through the inlet of the separation pipe is repeatedly sprayed onto the compression-molded product with powder supplied into the separation tube, and the powder is separated from the compression-molded product while Forming an airflow that flows upward along the inner surface of the separation tube;
While repeatedly moving the compression molded product by the air flow in the direction crossing the longitudinal direction along the inner surface of the separation tube against its own weight, it is slid down in the direction of the lowest part by its own weight. Move towards the exit,
This air flow passes through the powder outlet provided along the tangent line of the inner surface of the separation tube through the powder conveyed upward along the inner surface of the separation tube by the air flow as the compression molded product slides down. A powder removal method for a compression molded product, wherein the powder is sucked out of the separation tube and collected.

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