WO2001015798A1 - Methode de commande d'un dispositif de granulation par voie seche et unite de commande - Google Patents

Methode de commande d'un dispositif de granulation par voie seche et unite de commande Download PDF

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Publication number
WO2001015798A1
WO2001015798A1 PCT/JP2000/005303 JP0005303W WO0115798A1 WO 2001015798 A1 WO2001015798 A1 WO 2001015798A1 JP 0005303 W JP0005303 W JP 0005303W WO 0115798 A1 WO0115798 A1 WO 0115798A1
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WO
WIPO (PCT)
Prior art keywords
load
compression
dry granulation
granulation apparatus
upper limit
Prior art date
Application number
PCT/JP2000/005303
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English (en)
Japanese (ja)
Inventor
Akira Iwasaki
Hiroshi Okada
Shigemi Isobe
Original Assignee
Freund Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Freund Industrial Co., Ltd. filed Critical Freund Industrial Co., Ltd.
Publication of WO2001015798A1 publication Critical patent/WO2001015798A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/22—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by pressing in moulds or between rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/08—Making granules by agglomerating smaller particles

Definitions

  • a granular material to be processed is supplied between a pair of compression rollers.
  • both compression rollers receive a force to push them apart from the supplied granular material as a reaction of the compression load during compression molding.
  • a hydraulic mechanism is provided on one of the compression rollers to press the compression roller to prevent its escape.
  • the product quality of a dry granulator depends on the compressive load applied to the powder by the rollers. For this reason, dry granulators usually simulate the pressing force of a roller as a compressive load applied to the granules for convenience, and use this as a guide for forming products.
  • the product quality is affected not only by the roller pressing force, but also by the supply amount of the granular material and the roller rotation speed. Therefore, for example, Japanese Patent Application Laid-Open Nos. Hei 1-20771 / 27, Japanese Patent Laid-Open Nos. 5-293333 / 1972, Japanese Patent Laid-Open Nos. No.
  • 6 648 discloses that the number of rotations of a screw or a compression roller is feedback-controlled using the distance between rollers and the load of a screw feeder for supplying powder and granular material, and the quality of the product is reduced.
  • Various methods for improving the definition have been proposed.
  • the value of the molded product thickness t is measured by a sensor that detects the roller interval.
  • the rotational speed r of the screw feeder is feedback-controlled by the molded product thickness t.
  • control of the roller pressing force P based on the molded product discharge density D and control of the screw feeder rotation speed r based on the molded product thickness t are combined to improve product quality.
  • the gap between the rollers is controlled based on the supply material temperature, the processing amount, the particle size, the processing elapsed time, and the roller temperature.
  • the feed material temperature is measured by a temperature measurement filter
  • the processing amount is measured by a processing amount measuring device
  • the particle size is measured by a grinding degree measuring device.
  • the material that is repeatedly processed is controlled so that the gap becomes smaller as time passes.
  • the temperature of the roller is adjusted by supplying a temperature adjusting liquid to the cavity inside the roller, and the temperature is adjusted by a thermostat. And the control device adjusts the gap based on each detected value, Stabilizes product quality.
  • the number of rotations of the screw feeder and the compression roller is controlled by the distance between the rollers, but the compression load applied to the powder is measured directly.
  • the apparatus is controlled using the roller distance, the molded product thickness, the screw load, the processing amount, etc., which are relatively easily measured. I have.
  • the distance between rollers and the like merely indicate indirectly the compressive load applied to the granular material. Therefore, control based on these values cannot be said to accurately reflect the state of the granular material, and a control form that more accurately grasps the state of the granular material has been desired. Disclosure of the invention
  • An object of the present invention is to provide a method for controlling a dry granulation apparatus capable of accurately grasping the compressive load by directly measuring the compressive load applied to the granular material and thereby stabilizing product quality. Is to do.
  • a method for controlling a dry granulation apparatus includes a pair of side-by-side compression rollers, and supplies a powder material between the compression rollers to form a compression molded product.
  • a method for controlling a granulating apparatus comprising: measuring a distortion generated in a compression roller supporting portion that supports the compression roller; and, based on the distortion value, a supply amount of the granular material or rotation of the compression roller. It is characterized in that one or both of the numbers are controlled.
  • a compressive load applied to the granular material is calculated from the distortion value, and either or both of the supply amount of the granular material and the number of rotations of the compression orifice may be controlled.
  • one or both of the supply amount of the powder and / or the rotation speed of the compression roller may be feedback-controlled so that the distortion value is constant.
  • a compressive load applied to the granular material is calculated from the strain value, a reference load is set in advance for the compressive load, and a supply amount of the granular material is increased until the compressive load reaches the reference load.
  • the compression load reaches the reference load
  • the supply amount of the granular material at that time is calculated to maintain the supply amount, or the rotation speed of the compression roller at that time is calculated. Alternatively, the rotation speed may be maintained.
  • a first upper limit load and a first lower limit load are set in advance for the compressive load, and when the compressive load reaches the first upper limit load or the first lower limit load, thereafter, the compressive load is set to a predetermined value.
  • a second upper limit load larger than the first upper limit load and a second lower limit load smaller than the first lower limit load are set in advance for the compressive load, and the compressive load is set to the second upper limit load or the second lower limit load.
  • the powder or granules may be supplied between the compression rollers by a screw feeder, and the supply amount of the powder or granules may be controlled by adjusting the rotation speed of the screw feeder.
  • a control device for a dry granulation apparatus includes a pair of compression rollers arranged side by side, and supplies a granule between the compression rollers to form a compression molded product thereof.
  • a distortion detecting means for measuring distortion generated in a compression roller supporting portion for supporting the compression roller; and a compressive load applied to the granular material based on a distortion value detected by the distortion detection means.
  • a compression load control means for controlling one or both of the supply amount of the granular material and the number of rotations of the compression roller based on the calculated compression load. It is characterized by: In this case, one or both of the supply amount of the powder and / or the rotation speed of the compression roller may be feedback-controlled by the compression load control means so that the distortion value is constant.
  • storage means for storing a reference load preset for the compression load is further provided, and the compression load control means increases the supply amount of the granular material until the compression load reaches the reference load.
  • the compression load control means increases the supply amount of the granular material until the compression load reaches the reference load.
  • the supply amount of the granular material at that time is calculated to maintain the supply amount, or the rotation speed of the compression roller at that time is calculated and The rotation speed may be maintained.
  • a first upper limit load and a first lower limit load preset for the compressive load are further stored in the storage means, and the compressive load is controlled by the compressive load control means to be the first upper limit load or the first lower limit load.
  • the rate at which the compression load exceeds the first upper limit load or falls below the first lower limit load within a predetermined monitoring time thereafter is calculated, and the rate is set in advance.
  • the threshold value is exceeded, the supply amount of the granular material may be changed, or the rotation speed of the compression roller may be changed.
  • the storage means further stores a second upper limit load larger than the first upper limit load and a second lower limit load smaller than the first lower limit load for the compression load, and the compression load is When the compression load reaches the second upper limit load or the second lower limit load, the control unit may stop supply of the powder or granules or stop rotation of the compression roller. .
  • the supply amount of the granular material is controlled by supplying the granular material between the compression rollers by a screw feeder, and adjusting the rotation speed of the screw feeder by the compression load control means. You may do it.
  • FIG. 1 is an explanatory view showing an example of a dry granulation apparatus to which a control method according to an embodiment of the present invention is applied, wherein (a) is a front view and (b) is a side view.
  • FIGS. 2A and 2B are explanatory diagrams showing a configuration inside a powder processing chamber of the dry granulation apparatus of FIG. 1, wherein FIG. 2A is a front view and FIG. 2B is a side view.
  • FIG. 3 is a plan view of the dry granulation apparatus of FIG.
  • FIG. 4 is an explanatory diagram showing a configuration of a granular material conveying means in the dry granulation apparatus of FIG.
  • FIG. 5 is an explanatory view showing the configuration of a sealing member in the dry granulation apparatus of FIG. 1, (a) is a plan view, (b) is a front view, and (c) is a bottom view.
  • FIG. 6 is an explanatory diagram showing a configuration of a compression roller mechanism in the dry granulation apparatus of FIG. You.
  • FIG. 7 is an explanatory diagram showing a configuration of a side seal in the dry granulation apparatus of FIG. 1.
  • FIG. 8 is an explanatory diagram showing a system configuration for implementing a control method according to the present invention.
  • FIG. 9 is a control block diagram of the indicating / controller and the sequencer.
  • FIG. 10 is an explanatory diagram showing the configuration of the lifting mechanism in the dry granulation apparatus of FIG.
  • FIG. 11 is a flowchart showing a control procedure of the screw and the compression roller during the powder compression molding.
  • FIG. 13 is a flowchart showing a control procedure of the screw and the compression roller during the compression molding of the granular material.
  • FIG. 14 is a time chart showing a control mode according to the control method of the present invention.
  • FIG. 1 is an explanatory view showing an example of a dry granulation apparatus to which a control method according to an embodiment of the present invention is applied, wherein (a) is a front view and (b) is a side view.
  • FIGS. 2A and 2B are explanatory views showing the configuration of the inside of the powdery granule processing chamber of the dry granulation apparatus shown in FIG. 1, wherein FIG. 2A is a front view and FIG.
  • FIG. 3 is a plan view of the dry granulation apparatus of FIG.
  • the dry granulation apparatus shown in Fig. 1 includes a housing body 1 installed on a floor surface G, and an eight housing body 1 is provided with a powder processing chamber for actually processing the powder through a partition wall 2. 70 and a drive room 4 in which a control operation panel and motors are installed.
  • FIG. 4 is an explanatory view showing the structure of the granular material transport means 17.
  • the granular material transport means 17 is provided with a charging hopper 19 for receiving and storing the supplied granular material, and a charging hopper 1. Vertical feed connected to the bottom of 9 And a powder and granular material pumping means 20.
  • the granular material pumping means 20 is composed of a screw feeder (hereinafter abbreviated as a screw) 23 and a transport pipe 69.
  • the screw 23 is connected to a drive shaft of a motor 21 installed on an upper portion of the housing body 1 via a worm gear mechanism 22.
  • the transfer pipe 69 is provided with a degassing barrel 24, a degassing jacket 25 for covering the degassing barrel 24, and a degassing jacket 25 connected to vacuum suction means (not shown).
  • the mouth is composed of 26.
  • the transfer pipe 69 does not necessarily have to have a structure having the degassing function as described above.
  • the charging hopper 19 is a funnel-shaped container having a handle 27 attached to an outer peripheral surface thereof, and a screw 23 is vertically inserted along a central axis thereof.
  • a scraper 28 attached to a screw 23 is provided inside the charging hopper 19 so as to be slidable and rotatable along the funnel-shaped inner peripheral surface 19a.
  • a short pipe portion 29 is formed at the lower end of the input hopper 19 where the diameter is reduced, and a joining flange 29 a is provided on the outer periphery of the short pipe portion 29.
  • a flange 31 fitted with the annular packing 30 is welded to the upper surface of the charging hopper 19.
  • a degassing barrel 24 formed to the same diameter as the lower portion of the short pipe portion 29 is joined.
  • the degassing barrel 24 is formed of a member that can pass air but cannot pass powders, for example, a porous material such as sintered metal or ceramic.
  • the degassing barrel 24 has a flange portion 24a formed on the outer periphery thereof.
  • FIG. 4 shows a configuration in which the end portions of the short tube portion 29 and the degassing barrel 24 are joined to each other, they may be connected to each other to improve the adhesion between them.
  • Joint flanges 32, 33 are welded to the upper and lower sides of the degassing jacket 25.
  • the joining flange 32 of the short pipe part 29 is joined to the upper joining flange 32 with the flange part 24 a of the deaeration barrel 24 interposed therebetween, and both are fixed by the clamp 34. Is done.
  • the degassing jacket 25 is integrally and coaxially fixed to the lower portion of the charging hopper 19 with the degassing barrel 24 accommodated therein.
  • the degassing jacket 25 has a jacket structure that surrounds the degassing barrel 24 from the outside with an appropriate space between the degassing barrel 24 and the degassing jacket 25 and the degassing barrel 24.
  • a deaeration chamber 35 is formed.
  • a deaeration port 26 is provided in communication with the deaeration chamber 35, and is connected to a vacuum pump (not shown).
  • the joining flange 33 at the lower part of the degassing jacket 25 is formed in a quadrilateral shape, and the sealing member 36 is joined to the lower part.
  • the joining flange 33 is provided with a through hole 33 a for a long screw, and by tightening a long screw (not shown) into the through hole 33 a, the sealing member 36 and the compression roller mechanism 18 are tightened. Are linked.
  • FIGS. 5A and 5B are explanatory views showing the configuration of the sealing member 36.
  • FIG. 5A is a plan view
  • FIG. 5B is a front view
  • FIG. 5C is a bottom view.
  • the sealing member 36 is formed in a quadrilateral shape, and the convex portion 36 a inserted and joined to the joining flange 33 of the degassing jacket 25, and the degassing barrel 24 And a through hole 36b having the same diameter as that of the through hole 36b are integrally formed.
  • a dovetail groove 36c formed so that a side seal 37 attached to a compression roller mechanism 18 described later can be inserted, and a compression roller 3c.
  • a relief part 36 d is provided to avoid interference with 8 a and 38 b. Further, the sealing member 36 is provided with a through hole 36 e for a long screw penetrated from the degassing jacket 25, and furthermore, grips 36 f are fixedly provided on both sides of the outer shape. I have.
  • FIG. 6 is an explanatory diagram showing the configuration of the compression roller mechanism 18.
  • the compression roller mechanism 18 has a pair of compression rollers 38 a and 38 b keyed to the compression roller support shafts 39 a and 39 b, whereby the powder material conveying means 17 is provided. It is configured to compression-mold the granular material supplied from.
  • the compression roller mechanism 18 has a front side frame block (hereinafter, referred to as a frame) formed with the above-mentioned through holes 33a and 36e and having screw holes 40 into which long screws are screwed.
  • a frame front side frame block
  • (Abbreviated) 41 and rear side frame block (hereinafter abbreviated as frame) 42 are provided.
  • the frame 41 and the frame 42 are juxtaposed in parallel with the movable wall 46 attached to the partition 2, and the compression rollers 38a and 38b are arranged between them in a state where they are combined with each other.
  • bearings 43 a to 43 d are attached to the frame 41 and the frame 42 by bearing retainers 44 a to 44 d.
  • the reduced roller support shafts 39a and 39b are supported by these bearings 43a to 43d, and the above-mentioned frames 41 and 42, bearings 43a to 43d, and bearing holders are provided.
  • a compression roller support portion for supporting the compression roller support shafts 39a and 39b is formed by 44a to 44d. Further, an evening rod 45 is provided between the frame 41 and the frame 42 to maintain a distance between the two frame blocks.
  • Constant-speed gears 47a and 47b are attached to the pair of compression roller support shafts 39a and 39b, respectively, and the compression roller support shaft 39b has a compression roller driving motor 4a. 8 are connected via a coupling 49.
  • the compression roller driving motor 48 rotates, the compression roller 38b rotates clockwise and the compression roller 38a rotates counterclockwise at a constant speed.
  • the side seal 37 is made of, for example, a Teflon material, and a convex portion 37 a that slidably fits into the dovetail groove 36 c of the sealing member 36 is provided on the upper portion thereof. It is formed. Further, the lower portion is a tapered portion 37b corresponding to the shape of the granular material introduction compression portion 50.
  • the side seal 37 is provided between the frame 41 and the compression rollers 38a and 38b and between the frame 42 and the compression rollers 38a and 38b, in a range of about 0.1 to 0.3 ran. With a gap of 72.
  • the granular material enters between both side surfaces of the compression rollers 38 a and 38 b and the side seal 37, and a sealing layer of the granular material is formed to seal the granular material introduction compression section 50.
  • a sealing layer of the granular material is formed to seal the granular material introduction compression section 50.
  • the size of the gap 72 is exaggerated for easy understanding of the relationship between the side seal 37 and the compression rollers 38a, 38b.
  • the granular material itself forms a closed layer using the side seal 37 to seal the granular material introduction / compression section 50.
  • the powder / particle introduction compression section 50 is surrounded by the force side seal 37, the pair of compression rollers 38a and 38b, and the lower surface of the sealing member 36, the powder / particle pressing means 20 It is possible to obtain a robust pressure-resistant structure that can withstand the pressure generated when the pressure-feeded powder is sent out between the compression rollers 38a and 38b.
  • the compression rollers 38a and 38b are separated by a reaction force from the powder to prevent the compression force of the powder from being reduced.
  • 38a and 38b are pressed by a hydraulic cylinder or the like.
  • the compression rollers 38a and 38b are fixedly installed at a fixed center distance without using an actuator such as a hydraulic cylinder. .
  • Such a configuration makes it possible to greatly simplify the compression roller mechanism 18 as compared with the conventional device and prevent dirt from a hydraulic device or the like, but if no measures are taken, the compression of the powder or granules is not possible.
  • the rollers 38a and 38b may be separated from each other, and a sufficient compressive load may not be obtained. That is, when the granules are supplied to the granule introduction / compression section 50 and compression molding is performed between the compression rollers 38a and 38b, the powder is applied to the compression rollers 38a and 38b. The reaction force of compressing the granules is applied. For this reason, the compression rollers 38a and 38b receive a force in a direction away from each other, and an unnecessarily large gap is formed between the two, so that the compression load of the granular material is reduced.
  • the strain sensor 51 a commercially available, for example, adhesive metal strain gauge is used.
  • This metal strain sensor is made of a foil made of a copper alloy such as nickel copper or copper constantan, and can detect a change in strain as a change in resistance value.
  • the position where the strain sensor 51 is attached is determined by specifying the location where the most strain occurs by the actual load test as a result of the structural analysis of the device. For example, experimentally, a constant compressive load is first applied to an actual device, and the strain value at that time is read by an indicator of a strain sensor. This is achieved by converting the relationship between the compressive load and the strain value into a graph, and reading the coefficient for calculating the compressive load from the strain value from a graph.
  • FIG. 8 is an explanatory diagram showing a system configuration for implementing the control method according to the present invention.
  • the control load including the strain sensor 51, the indicator / controller 81, and the sequencer 82 calculates the compressive load applied to the granules, and based on the calculated load, the screw 23, The number of rotations of the compression rollers 38a and 38b is feedback-controlled.
  • the distortion of the frame 42 detected by the distortion sensor 51 is first sent to the indicating-controller 81.
  • Indication ⁇ Controller 81 calculates the compressive load applied to the granular material from the sent strain value, and compares the compressive load with various preset values. The result of this comparison is sent to the sequencer 82, and the optimal operation mode such as the screw 23 is determined according to a predetermined control flow set by the operation panel 83. Then, a control signal for the screws 23 and the like is output from the sequencer 82 to control the rotation speed of the screws 23 and the like.
  • FIG. 9 is a control block diagram of the indicating / controller 81 and the sequencer 82.
  • the compressive load calculating means 91 first calculates the compressive load applied to the granular material based on the strain value.
  • the value is sent to the compressive load comparing means 92, and is compared with a predetermined threshold value stored in ROM 94.
  • the compression load data is stored in RAM 95 every moment. Then, the compression load data and the result of the comparison between the compression load and the threshold value are sent to the compression load control means 93 of the sequencer 82.
  • members 84 and 85 control the screw drive motor 86 and the compression roller drive motor 87.
  • the rotation speeds of the screw 23 and the compression rollers 38 a and 38 b are controlled to values determined based on the strain sensor 51. That is, in the dry granulation apparatus, the compressive load applied to the granular material is directly detected by the strain sensor 51, and the screw 23 and the compression rollers 38a, 38b are optimally controlled based on the detected value. Therefore, it is possible to stably form the powder and granules under the optimum processing conditions, and to stabilize the quality of the molded product.
  • FIG. 10 is an explanatory diagram showing the configuration of the elevating mechanism 56.
  • the motor base 57 is fixed to the movable wall 46 as shown in FIG. 2 (b).
  • the movable wall 46 has a loading hopper 19, a deaeration jacket 25, and a sealing roller 36 to which a sealing member 36 is physically connected.
  • the mechanism 16 is fixed. Therefore, as the motor base 57 moves up and down, the compression roller mechanism 18 and the like move up and down in the powder processing chamber 70 integrally.
  • the lifting mechanism 56 for raising and lowering the motor base 57 includes guides 58, 58 fixed on both inner surfaces of the housing body 1, a hydraulic cylinder 59, and a hydraulic cylinder 59.
  • the slider 60 is configured to move up and down on a guide 58 by a cylinder 59. Therefore, when the hydraulic cylinder 59 is actuated, the motor base 57 moves up and down, and the compression roller mechanism 18 and the loading hopper 19 installed on the movable wall 46 move up and down in the powder processing chamber 70. Will do.
  • FIG. 2 (b) shows the state of the loading hopper 19 ascending and descending, and the loading hopper 19 can move between the position indicated by the solid line and the dashed line. .
  • the distance between the end of the screw 23 and the compression rollers 38a, 38b can be appropriately changed. Therefore, for example, in the case of powder particles that are agglomerated by the supply force of the screw 23 before the compression rollers 38a and 38b, a large distance between the two should be taken to prevent the aggregation. Can be done. Conventionally, to prevent this agglomeration, the length of the screw 23 has been changed by changing the length of the screw 23. Had been replaced. However, in the dry granulation apparatus according to the present invention, the screw 23 is fixed and the charging hopper 19 is movable, so that a single screw can be applied to a wide range of powders and granules. The number of types can be reduced.
  • the cleaning device 73 includes a cleaning nozzle 61, which is disposed at appropriate intervals on the inner circumferential surface of the charging hopper 19 and injects a cleaning liquid toward the inner surface of the charging hopper 19, A cleaning nozzle 62 disposed at an appropriate position on the inner wall surface of the body processing chamber 70.
  • the cleaning nozzle 62 is attached to a cleaning pipe 63 extending vertically in the granular material processing chamber 70.
  • the cleaning pipe 63 and the cleaning nozzle 61 are shown in the figure. Not connected to the cleaning solution supply pump.
  • a drain pipe 64 for discharging the processing liquid after the cleaning is provided at the bottom of the powder processing chamber 70.
  • a seal member 65 is attached to the edge of the opening 2a opened in the partition wall 2 for installing the compression roller mechanism 18 and the compression roller driving motor 48.
  • a door 66 that can be opened and closed with respect to the eight housing body 1 is provided in the front part of the granular material processing chamber 70, and the door 66 holds the inside of the granular material processing chamber 70.
  • Transparent windows 67 are fitted so that they can be seen from the outside.
  • a vibration isolator 68 is interposed between the housing body 1 and the floor surface G to support the dry granulator with vibration isolation.
  • the raw material powder is vacuum-transported from the powder storage tank 5 to the input hopper 19 via the hose 71.
  • the granular material sent to the supply hopper 8 is a granular material having a high specific volume and a high bulk density.
  • the annular packing 30 at the top thereof is in contact with and close to the back surface of the top plate of the housing body 1.
  • the supply of the granular material to the charging hopper 19 is performed by lowering the charging hopper 19, and thereafter, the charging hopper 19 is raised to keep the charging hopper 19 sealed. Therefore, the granular material supplied into the charging hopper 19 is stored in the charging hopper 19 without scattering or leaking out of the charging hopper 19.
  • the loading hopper 19 is moved downward by a lifting mechanism 56 so that the top of the loading hopper 19 is separated from the position where it contacts the back surface of the housing body 1. Since it is mounted so that it can be moved up and down, it is also possible to lower the charging hopper 19 and manually input different types of powders and the like from the gap provided above it.
  • the granules in the charging hopper 19 are sent to the compression roller mechanism 18 via the granule conveying means 17. That is, the powder is sent downward from the charging hopper 19 by the screw 23 of the powder pressing means 20. At this time, the scraper 28 also rotates with the rotation of the screw 23, and the granular material in the charging hopper 19 is sent to the lower conveying pipe 69 by its own weight and the rotation of the screw 23.
  • the transfer pipe 69 communicates with the short pipe section 29 of the input hopper 19, and the powder is sent into the degassing barrel 24 of the transfer pipe 69 via the short pipe section 29.
  • the degassing barrel 24 of the transfer pipe 69 communicates with the short pipe section 29 of the input hopper 19, and the powder is sent into the degassing barrel 24 of the transfer pipe 69 via the short pipe section 29.
  • Reference numeral 24 denotes a member formed of a gas-permeable member, around which a degassing jacket 25 connected to a vacuum pump (not shown) is provided.
  • a sealing member 36 and a compression roller mechanism 18 are provided below the sealing member 36. Therefore, the powder in the degassing barrel 24 is pumped by the screw 23 under negative pressure in a state where the flow is temporarily stored and squeezed by the sealing member 36 and the compression roller mechanism 18. become. For this reason, the granular material is compressed in the degassing barrel 24, and the air inside is degassed. Then, the air contained in the granular material passes through the deaeration chamber 35 through the fine holes of the deaeration barrel 24 and is forcibly evacuated from the deaeration port 26 of the deaeration jacket 25.
  • the granular material pumped by the granular material pumping means 20 is supplied to a granular material introduction / compression section 50 formed between the compression rollers 38a and 38b.
  • the compression rollers 38a and 38b rotate inward so as to join each other, and the powder is sandwiched between them and sent out to be compressed at a high density.
  • the side seal 37 of the compression roller mechanism 18 is slightly slid in the dovetail groove 36 c of the sealing member 36 by the compressive load of the granular material by the granular material feeding means 20. 38a, 38b on both sides and side seals
  • a gap 72 of about 0.1 to 0.3 ⁇ is formed between 37.
  • the granular material enters the gap 72 of about 0.1 to 0.3 mm, and the granular material itself bridges between both side surfaces of the compression rollers 38 a and 38 b and the side seal 37.
  • the compression rollers 38a, 38b and the side seals 37 do not come into contact with each other, abrasion powder of the side seals 37 or the compression rollers 38a, 38b does not enter the powder. Further, neither heat due to friction is generated in both the compression rollers 38a, 38b and the side seal 37, so that the product quality can be stabilized.
  • the compression rollers 38a and 38b When the compression rollers 38a and 38b receive a reaction force due to the compressive load of the granular material, the force is transmitted via the compression roller support shafts 39a and 39b and the bearings 43a to 43d. Is transmitted to the frames 41 and 42, and the force causes the frame 42 to be distorted.
  • the strain sensor 51 is attached to the frame 42 to detect the compression load applied to the granular material, and the screw 23 or the compression roller 38 a is determined according to the value. , 3 8b are feedback controlled.
  • FIGS. 11 to 13 are flowcharts showing control procedures of the screw 23 and the compression rollers 38a and 38b during the powder compaction molding
  • FIG. 14 is a flowchart showing a control mode according to the control method of the present invention. It is a time chart shown. In the granulating apparatus of the present embodiment, these controls are executed by the indicating / controller 81 and the sequencer 82.
  • the number of rotations of the screw 23 and the compression rollers 38a and 38b is set in steps S1 and S2.
  • This rotation speed is set as a reference rotation speed from the operation panel 83, and the compression load control means 93 takes in the value when the device is started up and issues a control signal to the members 84, 85.
  • step S3 predetermined values such as a reference load value and a first upper limit load Hj value described later are set in the indicating / controller 81. These values are set from the input unit 98 of the controller 81, but the data is stored in advance in the ROM 94, and the values are stored based on the instruction from the input unit 98. It may be selected and set.
  • predetermined values such as a reference load value and a first upper limit load Hj value described later are set in the indicating / controller 81.
  • step S3 After the various values are set in steps S: to S3, the process proceeds to step S4, where the compression rollers 38a, 38b are driven, and then, in step S5, the screw 23 is driven. Then, the process proceeds to step S6, where feedback control based on the detection value of the strain sensor 51 is started.
  • step S7 the output of the strain sensor 51 is read by the compression load calculating means 91. Then go to step S8, The compression load calculating means 91 calculates the compression load applied to the granular material from the read strain value.
  • the ROM 94 stores a table indicating the relationship between the distortion value and the compression load. This table is composed of data obtained in advance through experiments and the like, and the compression load calculation means 91 calculates the compression load from this table with interpolation calculation.
  • the compression load is calculated, the value is displayed on the display section 97, and the process proceeds to step S9.
  • step S9 it is determined whether or not the granulation process has been completed. If the process has not been completed, the process proceeds to step S10. Then, in step S10, it is determined whether the compression load calculated by the compression load comparison means 92 is within the reference load range.
  • the reference load is set from the input unit 98 as a load area having a predetermined width as shown in FIG.
  • the reference load may be stored in advance in the ROM 94, and an instruction from the input unit 98 or automatic selection and setting may be made.
  • the upper and lower limits of the reference load are set so that a product of desired quality is formed when the compression load is within the range. Ie, the first upper load H 1 as the upper limit value, also, the first lower limit load L j is set as the lower limit value.
  • the outside reference load range in order to determine the contamination and materials termination or the like, a second upper limit load of H 2 higher than the first upper limit load H i, is lower than the first lower limit load L i the second lower load L 2 value is set.
  • step S10 when the granulation process is started, the compressive load applied to the granular material gradually increases.
  • the compression load becomes substantially the center value of the reference load range.
  • the process returns from step S10 to step S9, and control is performed to maintain the rotation speed. Therefore, when the compressive load changes within the reference load range as shown in the diagram X in FIG. 14, the granulation process proceeds while repeating steps S9 and S10. Thereafter, when the granulation process is completed, the process proceeds to the flow of FIG. 12, and the feedback control is stopped in step SI1.
  • step S12 the screw 23 force is applied.
  • step S13 the compression rollers 38a and 38b are stopped, and the routine exits.
  • the compression load fluctuates due to the change in own weight due to the increase and decrease of the raw material due to the reduction of the raw material and the introduction of new raw material into the input hopper 19. If the value falls outside the reference range, the flow of FIG. 13 proceeds. That is, in step S14, it is first determined whether the compression load has reached the first lower limit load 1 ⁇ . For example, as shown by the part in the diagram ⁇ in FIG. when below the Ru compared with the second lower load L 2 is performed the process proceeds to step S 1 5. At this time, if you are also below the second lower limit load L 2 is totally stopped willing apparatus to Step S 1 6 regarded as the end of the raw material.
  • step S 19 the compression load changes to the first lower limit load 1 ⁇ within the monitoring time T from the time when the first lower limit load 1 ⁇ falls below (t 2 in Fig. 14).
  • the lower ratio (T SL ZT: 0 to 99%) is calculated, and it is determined whether or not it exceeds the determination threshold (for example, 50%).
  • the determination threshold for example, 50%.
  • the process proceeds to step S20, the rotation speed of the screw 23 is increased, and the process returns to step S7 in FIG. If not exceeded, it is determined that the supply amount of the granular material is not yet enhanced, and the process returns to step S7.
  • step S14 if it is determined in step S14 that the load is not smaller than the first lower limit load 1 ⁇ , the process proceeds to step S21.
  • the compressive load exceeds the first upper limit load, for example, as indicated by z 2 in the diagram Z of FIG. 14, the process proceeds to step S 22 and the second upper limit load H 2 A comparison is made.
  • Step S 2 3 considers that an abnormal situation such as contamination.
  • step S 2 2 when the second upper load H 2 was determined not to exceed the signal to that effect is sent to the compression load control means 9 3, the timer 9 6 operated in Step S 2 4 Then, a predetermined monitoring time T (which can be arbitrarily set in the range of 0 to 999.9 seconds) is measured. Then, in step S25, the sum T SH of the time during which the compression load exceeds the first upper limit load during the monitoring time T is measured.
  • step S 2 6 a first compressive load within the monitoring time T from the time around the top of the first upper load (t had t 3 in FIG. 1. 4) is first upper load 1 ⁇
  • the ratio (T SH ZT: 0 to 99%) that exceeds the threshold is calculated, and it is determined whether or not it exceeds the determination threshold (for example, 50%).
  • the ratio (T SH / T) does not exceed the determination threshold as in the Zl part in FIG. 14, it is determined that the supply of the granular material is not yet reduced so that step S 7
  • the ratio (T SH / T) exceeds the determination threshold as shown by z 2 in FIG. 14, it is determined that the supply amount of the granular material is too large, and the process proceeds to step S 27, where the screw 23 Decrease the number of rotations and return to step S7 in Fig. 11.
  • the clearance between the compression rollers 38a and 38b is maintained constant, and the compression load applied to the powder is directly detected by the strain sensor 51 to reduce the screw load.
  • Feedback control is performed on the rotation speeds of 23 and the compression rollers 38a and 38b. For this reason, the operating conditions can be adjusted by more accurately grasping the compressive load applied to the granular material, and the pressure applied to the granular material can be more finely controlled. Therefore, the powdery granules can be formed under optimum processing conditions, the compression load during processing is stable, and it is possible to obtain a compression-molded product having a suitable granule particle size distribution.
  • the granular material processing chamber 70 is in a sealed state, and in this state, the cleaning nozzle 61 is used to seal the inner surface of the charging hopper 19, the degassing barrel 24, the sealing member 36, and the side seal of the compression roller mechanism 18. 37, and the compression rollers 38a and 38b of the compression roller mechanism 18 are washed.
  • the loading hopper 19, the deaeration jacket 25, the sealing member 36, and the compression roller mechanism 18 are lowered by the lifting mechanism 56, and they are cleaned from the outside by the cleaning nozzle 62.
  • the inside of the processing chamber 70 is washed.
  • the strain sensor 51 is provided on the frame 42, but it goes without saying that the strain sensor 51 may be provided on the frame 41. Alternatively, the strain sensor 51 may be provided in both frames 41 and 42, and the average value of each data may be used.
  • the sum T SL time compressive load exceeds the first upper limit load H physician 1 ⁇ during monitoring time T the determination threshold the ratio between T SH and monitoring time (percentage)
  • the number of times exceeding the first upper / lower limit load H during the monitoring time T may be compared with a predetermined threshold value.
  • the compression load applied to the granules between the compression rollers is directly detected by the strain sensor, and based on this, the rotation speed of the screw or the compression roller is determined. Perform feedback control. For this reason, the operating conditions can be adjusted by more accurately grasping the compressive load applied to the granular material, and the compressive load applied to the granular material can be more finely controlled. Therefore, the granular material can be formed under optimal processing conditions, the compression load during processing can be stabilized, and the product quality can be stabilized.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Glanulating (AREA)

Abstract

Cette invention concerne une méthode de commande pour dispositif de granulation par voie sèche comprenant une paire de rouleaux de compression juxtaposés, qui permet d'obtenir des articles comprimés à partir d'une poudre amenée entre les rouleaux. On mesure la contrainte produite dans les supports des rouleaux de compression. A partir de cette valeur de contrainte, on calcule la charge de compression imposée à la poudre. Compte tenu de la charge de compression ainsi calculée, on règle en retour les vitesses de rotation de la vis d'alimentation et des rouleaux de manière à obtenir une valeur de contrainte constante. Comme la charge de compression à laquelle est soumise la poudre est déterminée avec précision, on peut obtenir une qualité de fabrication constante dans le dispositif de granulation par voie sèche.
PCT/JP2000/005303 1999-08-26 2000-08-08 Methode de commande d'un dispositif de granulation par voie seche et unite de commande WO2001015798A1 (fr)

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JP23916799A JP2001062280A (ja) 1999-08-26 1999-08-26 乾式造粒装置の制御方法および制御装置
JP11/239167 1999-08-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104437251A (zh) * 2014-12-12 2015-03-25 溧阳市正翔精密机械有限公司 环模制粒机
CN104474973A (zh) * 2014-12-12 2015-04-01 溧阳市正翔精密机械有限公司 制粒机

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WO2010060617A2 (fr) * 2008-11-25 2010-06-03 Kerry Biomass Technology Limited Système de formation de pastilles
JP5798400B2 (ja) * 2011-07-26 2015-10-21 富士電機株式会社 医薬品製造制御装置、医薬品製造制御方法、医薬品製造制御プログラム、医薬品製造システム
JP6185236B2 (ja) 2012-11-27 2017-08-23 古河産機システムズ株式会社 造粒機制御装置
US10899099B2 (en) 2014-10-23 2021-01-26 Furukawa Industrial Machinery Systems Co., Ltd. Device and method for evaluating operating conditions of briquetting machine, briquetting machine, method for manufacturing briquette, control device of briquetting machine, control method of briquetting machine, and program
CN104474971B (zh) * 2014-12-12 2016-09-14 溧阳市正翔精密机械有限公司 一种制粒机
JP6452245B2 (ja) * 2015-06-10 2019-01-16 フロイント・ターボ株式会社 乾式造粒機
DE102015014120A1 (de) * 2015-11-04 2017-05-04 Maschinenfabrik Bernard Krone Gmbh Vorrichtung zum Kompaktieren von faserigem Halmgut

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JPS54126674A (en) * 1978-03-22 1979-10-02 Kubota Ltd Automatic controller for granulator
JPS58128136A (ja) * 1982-01-27 1983-07-30 Hitachi Ltd 造粒機の制御方法
JPS58216731A (ja) * 1982-06-11 1983-12-16 Hitachi Ltd 造粒機の制御方法
JPS60248226A (ja) * 1984-05-22 1985-12-07 Kikusui Seisakusho:Kk 回転式粉末圧縮成形機における成形品の重量自動調整方法

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Publication number Priority date Publication date Assignee Title
JPS54126674A (en) * 1978-03-22 1979-10-02 Kubota Ltd Automatic controller for granulator
JPS58128136A (ja) * 1982-01-27 1983-07-30 Hitachi Ltd 造粒機の制御方法
JPS58216731A (ja) * 1982-06-11 1983-12-16 Hitachi Ltd 造粒機の制御方法
JPS60248226A (ja) * 1984-05-22 1985-12-07 Kikusui Seisakusho:Kk 回転式粉末圧縮成形機における成形品の重量自動調整方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104437251A (zh) * 2014-12-12 2015-03-25 溧阳市正翔精密机械有限公司 环模制粒机
CN104474973A (zh) * 2014-12-12 2015-04-01 溧阳市正翔精密机械有限公司 制粒机

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