JP2010115807A - Resin drying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the fluidity of a whole resin for molding during drying without disturbing the layering of the resin with regard to the drying of the resin. <P>SOLUTION: A resin drying device (200) for drying the resin in the shape of particles or powder (resin pellets 4) includes: a treatment vessel (drying vessel 6) for drying the resin; a rotation part (rotation body 28) rotating in the treatment vessel; a rotation bar (32) which is projected from the rotation part toward the inner wall surface of the treatment vessel, rotates with the rotation part, and moves in the resin in the treatment vessel; and a control bar (26) which is projected from the treatment vessel toward the rotation part and inserted into the resin in the treatment vessel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a resin drying apparatus that dries a molding resin, and more particularly to a resin drying apparatus that dries a resin before being supplied to the resin molding apparatus under reduced pressure.

  If the resin used for resin molding such as injection molding is moist, the moisture causes color change in the molded product and causes molding defects. Therefore, it is indispensable to dry the molding resin as a countermeasure against moisture removal. . The resin can be heated to remove the water, but if the resin is exposed to high temperatures, the resin will deteriorate, so in resin drying, the resin is placed in a reduced-pressure atmosphere to lower the boiling point of the water, Drying methods that remove moisture have been employed.

With respect to such resin drying, the resin is prevented from adhering and agglomerating by rocking the resin, realizing stable supply of the dry resin to the molding machine (Patent Document 1), in the stratified resin (Patent Document 2) that performs a process of rotating the blades up and down and moving the resin in the part where the blades pass up and down.
JP 2001-150436 A JP2007-045080

  In resin molding such as injection molding, moisture is a cause of defects, so drying is indispensable, but with resins such as liquid crystal polymer (LCP), pelletized granules are dried. The agglomerated state is agglomerated in the tank, and the resin in the aggregated state prevents the conveying process from the drying treatment tank to the molding apparatus after the drying process is completed. When the resin molding machine is stopped due to failure, cleaning, mold replacement, or the like, if the residence time of the resin in the drying treatment tank becomes long, the occurrence of the resin sticking state is remarkable. When the resin conveyance is hindered, the molding process becomes difficult, causing an abnormality in the molding apparatus.

  In order to avoid destabilization of resin conveyance, it is necessary to rock the resin before drying, during drying or after drying to prevent resin sticking and maintain fluidity. In order to maintain the fluidity, there is a method of imparting mechanical vibration, acoustic vibration, or the like to the resin in addition to shaking the resin or stirring the resin.

  To swing the resin, there is a method of circulating and swinging using a circulation line or a pump. This requires equipment that circulates and transports the resin, and liquid crystal polymers that become agglomerated in a short period of time need to be circulated frequently. There is a risk of transporting to a molding machine in a dry state. The resin supplied to the upper layer side of the treatment tank moves to the lower layer side by step and is dried, but the undried resin sinks from the upper part of the treatment tank to the lowermost side of the treatment tank and the discharge port May be discharged to the molding machine. In addition, resin that aggregates in a short time may not be able to cope with circulation fluctuation.

  In the method of stirring the resin, since all the resin in the processing tank is stirred regardless of the first-in first-out of the resin to be charged into the processing tank, the stratification state of the resin for the first-in first-out collapses and is separated from the processing tank. There are inconveniences such as disadvantages in equipment cost and installation area, such as the need for a heat storage tank for storing the resin after drying.

  In this resin stirring, in order to prevent stirring of all the resins, there is a method in which the blades are rotated in the stratified resin and the resin in the portion through which the blades pass is moved up and down to prevent resin agglomeration. In this method, if a material mixed with pulverized material (material recycled by pulverizing the part other than the molded product on the spot) is used, the size and shape of the pulverized material is not constant, so the blades will swing. There is a risk that the material will be absorbed and a bridge may be generated in the resin at the upper part of the treatment tank. In order to prevent absorption of the swinging action by the blades, if the size and shape of the blades are changed and the swinging action is spread to the upper part, the load on the drive unit side such as a motor becomes large. In addition, the shaft diameter and the like are increased, and the cost is increased.

  In addition, when the blade is rotated in the resin, the resin is rotated by the rotation of the blade, and a noise is generated due to friction between the resins or between the resin and the treatment tank, and a load is applied to the resin and the blade and its driving unit. I guess that.

  Accordingly, a first object of the present invention relates to drying of a molding resin, and is to improve the fluidity of all resins during the drying process without disturbing the stratified state of the resin.

A second object of the present invention is to improve the function of supplying a dry resin without impairing the first-in first-out of the resin treatment tank with respect to resin drying.

  In order to achieve the first or second object, the structure of the resin drying apparatus of the present invention is as follows.

  In order to achieve the above object, a resin drying apparatus of the present invention is a resin drying apparatus that dries granular or powdery resin, a treatment tank that dries the resin, and a rotating unit that rotates in the treatment tank. , Projecting from the rotating part toward the inner wall surface of the processing tank, rotating with the rotating part and moving in the resin in the processing tank, and projecting from the processing tank toward the rotating part And a stop rod inserted into the resin in the treatment tank.

  In order to achieve the above object, in the resin drying apparatus, preferably, the treatment tank includes a cylindrical part and a conical part, and ends of the plurality of control rods are directed toward the center of the rotating part. The rotating rod may be disposed at a plurality of positions in the height direction of the cylindrical portion, and the rotating rod may be disposed within the height-direction interval of the stop rod, and the protruding length may be different. It is good also as the structure which made it.

In order to achieve the above object, in the resin drying apparatus, preferably, a heating means is installed in the rotating portion, and the rotating rod is a heat conducting means for conducting heat of the heating means to the resin. Alternatively, a heating means may be installed in the treatment tank, and the control rod may be a heat conduction means for conducting heat of the heating means to the resin, or a decompression means for reducing the pressure of the treatment tank. In the resin drying process, the treatment tank may be maintained in a reduced pressure state by the pressure reducing means.

  (1) The rotating rod moves in the resin loaded in the treatment tank due to the rotation of the rotating part, and the stop rod inserted into the resin from the treatment tank side prevents the resin from rotating. Under the rotation, it can move up and down to prevent agglomeration of the resin, and a dry resin having fluidity can be obtained. Even if it is resin which becomes a conglomerate state in a short time, such as a liquid crystal polymer, a dry resin with fluidity can be obtained.

  (2) Since fluidity is obtained by moving the rotating resin up and down by rotating the rotating rod without impairing the stratification state of the treatment tank having the first resin as the lower layer and the second resin as the upper layer, Only the dry resin can be removed from the lower layer from the treatment tank. Reliability of resin drying can be improved.

  (3) If the rotating rod is installed at an appropriate position in the axial vertical direction and the axial direction, only the resin passing through the rotating rod is moved up and down without impairing the resin stratification state. Fluidization can be achieved.

  (4) If the rotating part is provided with a heating means, the heat of the heating means can be transferred to the resin through the rotating rod, the resin contacting the rotating rod is heated and dried, and if the processing tank is provided with a heating means The surrounding resin is dried, and heat is transmitted to the stop rod installed in the treatment tank, so that the resin can be dried uniformly.

  (5) With the stop rod installed in the treatment tank, it is possible to suppress the resin agitation caused by the rotation of the rotary rod and perform uniform resin swinging.

(6) If it is configured to control the rotation of the rotating part where the rotating rod is installed, the rotating rod can be rotated according to the type or form of resin or resin, regardless of the type or form, or to them. Accordingly, fluidization of the resin can be achieved.

  [First Embodiment]

  The first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, 7, 8, and 9. FIG. 1 is a partially cutaway view of a drying processing unit of a resin drying apparatus, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 4 is a diagram showing part A of FIG. 3, FIG. 5 is a diagram showing part B of FIG. 3, FIG. 6 is a diagram showing part C of FIG. 3, and FIG. 7 is a diagram showing part D of FIG. 8 is a diagram showing an E portion of FIG. 3, and FIG. 9 is a cross-sectional view showing a rotating portion of the swinging portion. The configurations illustrated in FIGS. 1 to 9 are examples, and the present invention is not limited to such configurations.

  This drying processing unit 2 is a drying means for heating and drying the resin pellet 4 as a molding resin under reduced pressure (or under vacuum). As shown in FIG. 1, a drying processing tank 6 and a swinging unit 8 are provided. The resin pellet 4 is supplied to the drying processing unit 2 through the replenishing unit 10. The resin pellet 4 is an example of a granular resin, and may be a powdery resin as a drying target.

  The drying treatment tank 6 is an example of a treatment tank that dries the resin pellets 4 under reduced pressure, and includes a cylindrical portion 12, a funnel portion 14, and a lid portion 16, and is placed in an upright state with the funnel portion 14 downward. Installed. A flange portion 18 having a diameter larger than that of the cylindrical portion 12 is formed on the upper portion of the cylindrical portion 12, and the upper opening portion is opened and closed by a lid portion 16 installed on the flange portion 18. A packing 20 is installed on the flange portion 18 so that the airtightness between the cylindrical portion 12 and the lid portion 16 is maintained. The packing 20 is an example of an airtight holding means, and other members or mechanisms may be used. A pressure reducing means for maintaining the inside of the drying treatment tank 6 at a reduced pressure or a vacuum is connected to the lid portion 16.

The cylindrical portion 12 is a cylindrical body having the same inner diameter, and a heater 24 (FIG. 21) is installed on the wall surface portion, and a plurality of stop rods 26 are radially directed toward the central axis O of the cylindrical portion 12. is set up. The stop rod 26 is a means for preventing the rotation of the resin pellet 4 in the stratified state in the cylindrical portion 12, and from above, the first plurality of stop rods 26A1, 26A2, 26A3, 26A4, the second plurality of stops. The rods 26B1, 26B2, 26B3, 26B4, the third plurality of stop rods 26C1, 26C2, 26C3, 26C4, and the fourth plurality of stop rods 26D1, 26D2, 26D3, 26D4 are installed in four stages, and the height direction The interval H ₁ is set in In this embodiment, as shown in FIG. 2, each of the control rods 26A1 to 26D4 is installed at an angle interval of θ ₁ = 90 [degrees], and has a total of 16 pieces. The length L ₁ of each stop rod 26A1 to 26D4 is set to be slightly smaller (W> L ₁ ) than the interval W between the inner wall of the cylindrical portion 12 and the outer surface of the rotating body 28 of the swinging portion 8.

  The swinging portion 8 is swinging means for swinging the resin pellet 4 in the drying treatment tank 6 to give the resin pellet 4 fluidity, and includes a rotation main body 28, a rotation driving unit 30, and the like. And a plurality of rotating rods 32 are provided radially on the rotating body 28. The rotating body 28 is an example of a rotating cylinder part, and the center of rotation coincides with the central axis O of the cylindrical part 12. That is, the outer surface portion of the rotating body 28 and the inner surface portion of the cylindrical portion 12 are concentric.

  The rotary body 28 is rotatably supported by the lid portion 16. The rotating body 28 includes a rotating shaft 34, and the rotating shaft 34 passes through the lid portion 16 and is supported by a bearing portion 36 on the lid portion 16. A rotational force is applied to the rotary shaft 34 via a rotary connecting portion 40 from a motor 38 installed on the lid portion 16. The rotation coupling unit 40 is an example of a rotation coupling unit, and may include a reduction unit that obtains a desired rotation based on a gear ratio, for example.

As shown in FIGS. 2 and 3, a plurality of rotating rods 32 are radially arranged on the peripheral surface portion of the rotating body 28, and each rotating rod 32 is a first plurality of rotating rods 32 </ b> A <b> 1 and 32 </ b> A <b> 2 from above. 32A3, 32A4, 32A5, 32A6, 32A7, 32A8 (FIG. 4), the second plurality of rotating rods 32B1, 32B2, 32B3, 32B4 (FIG. 5), the third plurality of rotating rods 32C1, 32C2 (FIG. 6) The fourth plurality of rotating rods 32D1 and 32D2 (FIG. 7) and the fifth plurality of rotating rods 32E1 and 32E2 (FIG. 8) are installed over the five stages, and the interval H ₂ is set in the height direction. Yes. In this embodiment, an H ₁ = H ₂ (FIG. 1), the distance [Delta] H between the stop bar 26 and the rotary rod 32 is set to _{ΔH = H 1/2 = H} 2/2, the stop bar 26 An interval ΔH is set in the height direction from the rotating rod 32. The interval ΔH may be partially different. The length L ₂ (FIG. 4) of each rotary rod 32A1 to 32D2 is set to be slightly smaller (W> L ₂ ) than the interval W between the inner wall of the cylindrical portion 12 and the outer surface of the rotary body 28 of the swinging portion 8. In addition, the length L ₃ (FIGS. 3 and 8) of the rotary rods 32E1 and 32E2 installed on the funnel portion 14 side satisfies L ₃ <L ₂ in order to avoid contact with the inner wall of the funnel portion 14. Is set.

As shown in FIG. 4, the rotating rods 32A1, 32A2, 32A3, 32A4, 32A5, 32A6, 32A7, and 32A8 are installed for each θ ₂ = 45 [°], and are composed of a total of eight. On the other hand, as shown in FIG. 5, the rotating rods 32B1, 32B2, 32B3, and 32B4 are installed at every θ ₃ = 2θ ₂ = 90 [°], and are composed of a total of four. As for the arrangement relationship between the rotating rods 32A1 to 32A8 and the rotating rods 32B1 to 32B4, assuming that the position of the rotating rod 32A1 is θ = 0 [°] and the reference position, the rotating rod 32B1 has an angle Δθab = 135 [° from the rotating rod 32A1. ] Is set.

As shown in FIG. 6, the rotating rods 32C1 and 32C2 are installed at every θ ₄ = 2θ ₂ = 4θ ₁ = 180 [°], and are composed of a total of two. The arrangement of the rotary rods 32A1 to 32A8 and the rotary rods 32C1 and 32C2 is set to an angle Δθac = 90 [°] between the reference position of the rotary rod 32A1 and the rotary rod 32C1.

As shown in FIG. 7, the rotating rods 32D1 and 32D2 are installed at every θ ₅ = 2θ ₂ = 4θ ₁ = 180 [°], and are composed of two in total. With respect to the arrangement of the rotating rods 32A1 to 32A8 and the rotating rods 32D1 and 32D2, an angle Δθad = 45 ° is set between the reference position of the rotating rod 32A1 and the rotating rod 32D1.

  Thus, the plurality of rotating rods 32 are the rotating rods 32A1, 32A2, 32A3, 32A4, 32A5, 32A6, 32A7, 32A8, rotating rods 32B1, 32B2, 32B3, 32B4, rotating rods 32C1, 32C2, and rotating rods 32D1, 32D2. In addition, each of the A to E stages has a different number and a minimum angle θmin = 45 [°] so that the rotating bars 32A1 to 32E2 do not overlap each other in the vertical direction. The angular displacement of is set.

As shown in FIG. 8, the rotating rods 32E1 and 32E2 are installed at every θ ₆ = 2θ ₂ = 4θ ₁ = 180 [°], and are composed of two in total. As for the arrangement of the rotary rods 32A1 to 32A8 and the rotary rods 32E1 and 32E2, an angle Δθae = 0 [°] is set between the reference position of the rotary rod 32A1 and the rotary rod 32E1. Since each rotary rod 32E1, 32E2 is installed in the funnel portion 14 of the drying treatment tank 6, it is set shorter than the other rotary rods 32A1 to 32D2, and a slight gap is set between the inner wall portion of the funnel portion 14. The contact with the funnel part 14 is avoided.

  The funnel portion 14 is a conical surface whose inner wall surface has a constant inclination while the inner diameter of the cylindrical portion 12 is the same. A discharge port 42 for the resin pellet 4 is formed at the lower end of the funnel portion 14, and the discharge port 42 is opened and closed by a shutter unit 43. When the shutter portion 43 is opened, the resin pellet 4 in the drying treatment tank 6 is discharged from the discharge port 42.

  As shown in FIG. 1, the replenishment unit 10 that replenishes the resin pellets 4 to the drying treatment tank 6 includes a replenishment hopper 44, a shutter unit 46, and an introduction cylinder 48. A suction force is applied through the conduit 50, and the resin pellet 4 is supplied from a pellet tank as a resin pellet supply source through the conduit 52 in accordance with the suction force. The shutter unit 46 is a separation unit that separates the replenishment hopper 44 and the introduction cylinder 48 and is an opening / closing unit. The introduction cylinder 48 is installed in the lid portion 16 and is a means for introducing the resin pellet 4. Therefore, when the shutter portion 46 is opened, the resin pellet 4 in the replenishment hopper 44 is supplied to the drying treatment tank 6 through the introduction tube 48.

  As shown in FIG. 9, the rotating body 28 includes a rotating cylindrical portion 54, and a rotating support portion 56 is provided on the rotating cylindrical portion 54. The rotating shaft 34 described above is provided on the rotating support portion 56. is set up. For example, a rubber heater 58 is installed on the inner wall portion of the rotating cylindrical portion 54 as a heating means, and the rubber heater 58 is fixed by a plurality of fixed spring plates 60 as a fixing means, for example. The rubber heater 58 heats the rotating cylindrical portion 54 and the rotating rod 32, and the heat is transmitted to the resin pellet 4 through the rotating cylindrical portion 54 and the rotating rod 32. On the lowermost fixed spring plate 60 for fixing the rubber heater 58, a temperature sensor 64 is installed together with the power feeding portion 62 of the rubber heater 58. The temperature sensor 64 is composed of, for example, a thermocouple. The power supply line 66 of the power supply unit 62 and the lead wire 68 of the temperature sensor 64 are led to the upper part of the rotary cylindrical unit 54 and are drawn out from the through hole 70 of the rotary shaft 34. While the drying tank 6 is maintained in a reduced pressure state, the rotating cylindrical portion 54 is maintained at atmospheric pressure, and therefore, a conical lid portion is provided at the lower end of the rotating body 28 to maintain airtightness. 72 is attached.

  Next, referring to FIG. 10, FIG. 11, FIG. 12, FIG. 13 and FIG. FIG. 10 is a view showing a drying treatment tank loaded with resin pellets, FIGS. 11 and 12 are views showing a swinging state of resin pellets, and FIGS. 13 and 14 are views showing other rotating rods. .

As shown in FIG. 10, the resin pellet 4 is loaded in the drying treatment tank 6, and when the rotating body 28 of the swinging unit 8 is rotated, the rotating rod 32 rotates, and each rotating rod 32 moves inside the resin pellet 4. Move around. When the rotating main body 28 is rotated forward, as shown in FIG. 11A, the rotating rod 32 moves around as indicated by the arrow m, and the resin pellet 4 whose rotation is prevented by the stop rod 26 is indicated by the arrows n ₁ and n ₂ . As shown, the resin pellet 4 moves upward as shown by the arrow n ₃ . Such vertical movement causes the resin pellet 4 to swing and maintain its fluidity. When the rotating main body 28 is reversed, as shown in FIG. 11B, the resin pellet 4 similarly swings and the fluidity is improved.

  In the swinging state of the resin pellet 4, in the case of normal rotation, as shown in FIG. 12A, the resin pellet 4 is in a dense state, and in the case of reverse rotation, as shown in FIG. 12B, the resin pellet 4 Becomes sparse and dense.

  Thus, since the resin pellet 4 is prevented from rotating in the drying treatment tank 6 by the stop rod 26 and is moved up and down by the rotating rod 32, the fluidity is maintained without disturbing the stratified state in the drying treatment tank 6. Enhanced.

  In the above embodiment, the rotating rod 32 is formed of a cylinder. However, as shown in FIG. 13, the rotating rod 32 is a triangular prism, the bottom surface 74 is kept horizontal, and the inside of the resin pellet 4 is rotated with the inclined surfaces 76 and 78 on the upper side. Further, as shown in FIG. 14, it is a quadrangular prism, the corners 80 and 82 are maintained in the horizontal direction, and the corners 84 and 86 are set up and down, and the inside of the resin pellet 4 is rotated. You may make it move.

  Next, the rotation mechanism unit 30 of the swing unit 8 will be described with reference to FIGS. 15 and 16. FIG. 15 is a diagram illustrating a rotation mechanism unit using a rotary actuator, and FIG. 16 is a diagram illustrating a rotation drive unit using an air cylinder. 15 and 16 are examples, and the present invention is not limited to such a configuration. 15 and 16, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  The rotary actuator 90 is an example of a rotational driving force generation unit, and can be used in place of the motor 38 described above. In this case, as shown in FIG. 15A, by supplying or retracting compressed air to the air passages 92 and 94 alternately, a rotational driving force for normal rotation or reverse rotation can be generated on the rotation shaft 96. By transmitting this rotational driving force to the rotary shaft 34 by the rotary connecting portion 40, the rotary main body 28 can be rotated as shown in FIG. 15B.

  When the air cylinder 98 is used, as shown in FIG. 16, one end of the air cylinder 98 is rotatably attached to the edge side of the lid portion 16 by the support shaft 100, and the arm 102 that moves forward and backward by the air cylinder 98 is attached. The crank 104 is rotatably attached to one end, and the rotation shaft 34 is attached to the rotation center of the crank 104. According to such a configuration, the crank 104 is rotated by the arm 102 that moves forward and backward from the air cylinder 98, and the rotational force is transmitted to the rotary shaft 34. Therefore, the air cylinder 98 and the crank 104 can be used in place of the motor 38.

  Next, the lid opening / closing mechanism will be described with reference to FIGS. 17, 18, 19, and 20. 17 is a view showing a lid opening / closing mechanism, FIG. 18 is a plan view showing the lid, and FIGS. 19 and 20 are views showing the alignment mechanism. 17 to 20 are examples, and the present invention is not limited to such a configuration. 17-20, the same code | symbol is attached | subjected to FIG. 1 and an identical part.

  As shown in FIG. 17, the lid 16 that opens and closes the drying treatment tank 6 is provided with a rotating body 28 of the swinging portion 8 and an opening and closing mechanism 106 that opens and closes the lid 16. The opening / closing mechanism 106 is an elevating unit that elevates and lowers the rotating body 28 together with the lid portion 16. In this embodiment, the opening / closing mechanism 106 includes a plurality of cylinder devices 108 and 110, and a housing in which the drying treatment tank 6 is installed. A cylinder 114 is installed on the body 112, and a lid 16 is fixed to an arm 116 that moves forward and backward by the cylinder 114. As shown in FIG. 18, fixing portions 118 and 120 are attached to the edge portion of the lid portion 16 with the rotating shaft 34 interposed therebetween, and the arms 116 of the cylinder devices 108 and 110 are fixed to the fixing portions 118 and 120. Each arm 116 is fixed to the fixing hole 121 of the fixing portions 118 and 120.

  A cylinder driving unit 122 is connected to the cylinder devices 108 and 110, and the advancement / retraction of the arm 116 is performed by the cylinder driving unit 122, and the driving control thereof is performed by the control unit 124. A motor 38 and a proximity sensor 126 are connected to the control unit 124. The control unit 124 is a control unit for the cylinder driving unit 122 and also a control unit for the motor 38. The proximity sensor 126 is a position detection unit that detects a stop position of the rotary body 28. That is, if the stop position of the rotary body 28 is not an appropriate position, that is, a position where the rotating rod 32 and the stop rod 26 are not buffered (a position where they do not collide), the motor 38 is driven and controlled to an appropriate position. And when the stop position of the rotation main body 28 is in an appropriate position, if an opening command is received, the cover part 16 will be moved upward, the drying process tank 6 will be opened and closed, and the rotation main body 28 can be raised / lowered.

  Therefore, as shown in FIGS. 19 and 20, a position detection piece 128 is attached to the rotating shaft 34, and the proximity sensor 126 described above is installed as means for detecting the position detection piece 128. When the position detection piece 128 arrives at a position opposite to the proximity sensor 126, a detection signal indicating the position is obtained in the proximity sensor 126. From the detection output of the proximity sensor 126, it can be determined whether or not the rotary body 28 is in the proper position. In this case, the gear 41 of the rotary connecting portion 40 is fixed to the rotary shaft 34. The rotating shaft 34 is rotatably supported by a bearing portion 36.

  Next, the features and effects of the above embodiment are listed as follows.

  (1) The squeaking noise of the resin pellet 4 can be suppressed, and a quiet drying process can be performed.

  (2) Regarding the control when the upper lid is raised, when the lid 16 is raised, if the vertical positions of the rotary rod 32 and the stop rod 26 coincide with each other, they cannot collide with each other and cannot be raised, but are rotated by the proximity sensor 126 or the like. The position is detected and it is determined whether or not it is at an appropriate position where it can be raised. If it is not at the appropriate position, it is rotated to change the position. Can be withdrawn from the drying treatment tank 6.

  (3) Regarding the type of rotational power, a motor is used as the driving force for rotation, but this is not a limitation. The shaft torque to be rotated when the resin pellet is actually full is about 13 [N · m] at maximum. Anything can be used as long as it can generate torque more than this shaft torque and can reciprocate at 90 [deg.] Or more. For example, a method of rotating via an arm using an air cylinder or a “rotary actuator driven by compressed air” It is also possible to replace it with a device commonly referred to as

  (4) With this structure, when there is no stop rod 26 on the drying treatment tank 6 side, the rotation phenomenon was eliminated when the material containing glass fiber and the material containing pulverized material rotating together were put.

  (5) The stopping rod 26 on the drying treatment tank 6 side stops the resin pellet 4 to be rotated, and the rotating rod 32 advances under the resin pellet 4, so that all the resin pellets 4 in the drying treatment tank 6 are granulated. The same can be swung and its fluidity can be improved.

  (6) The number of rotating rods 32 is eight, four, two, two, and two from the top, a total of 18 but the number of rotating rods 32 and stop rods 26 in the above embodiment Even when about ± 4, the phenomenon that the resin pellet 4 rotates could not be confirmed.

  (7) If the number of the rotating rods 32 and the stop rods 26 is large, the heat transfer surface area is advantageously increased on the heating surface of the resin pellet 4, but cleaning and cost in changing the material of the resin pellet 4 are advantageous. What is necessary is just to set a desired number by balance.

  [Second Embodiment]

  For the second embodiment of the present invention, refer to FIG. FIG. 21 is a diagram showing a resin drying apparatus connected to an injection molding machine. FIG. 21 is an example, and the present invention is not limited to such a configuration. In FIG. 21, the same parts as those in FIG.

  The resin drying apparatus 200 is configured by mounting the drying processing unit 2 of the first embodiment, takes out the resin pellet 4 from the pellet tank 208, dries it, and supplies it to the injection molding machine 202. A supply mechanism 206 for the pellet 4, a drying processing unit 2, and a supply unit 206 for the dried resin pellet 4 to the injection molding machine 202 are provided. There are various types of molding resins such as granular, powdery, or pellets. In this embodiment, resin pellets 4 are exemplified. In the resin drying apparatus 200, the drying processing unit 2 includes the pellet swinging unit 8, and the resin pellet 4 is partially agitated by the stop rod 26 installed in the drying processing tank 6. By oscillating the resin pellet 4, the agglomeration of the resin pellet 4 is prevented.

[Configuration and function of the replenishing mechanism 204 of the resin pellet 4]

  A drying tank 6 is installed in the drying unit 2, and a replenishment hopper 44 for the resin pellets 4 is installed above the drying tank 6. In order to flow the resin pellet 4 in the pellet tank 208 into the replenishment hopper 44, pipes 50 and 52 are connected to the replenishment hopper 44, the pipe 52 is inserted into the pellet tank 208, and a blower serving as suction means is provided in the pipe 50. 210 is connected, and an on-off valve 212 and a filter 214 are installed. A pipe 216 is connected to the blower 210, and an opening / closing valve 218 is provided in the pipe 216, and the pipe 220 is branched, and the pipe 220 is opened to the outside air via the opening / closing valve 222. Yes. In addition, a pipeline 224 is branched into the pipeline 50, and an on-off valve 226 is installed. Therefore, when the on-off valves 218 and 226 are closed and the on-off valves 212 and 222 are opened and the blower 210 is driven, the air in the replenishment hopper 44 is released to the outside air through the pipes 50, 52, 216 and 220. The pressure is reduced, and the resin pellet 4 is sucked into the supply hopper 44 through the pipe line 52 from the pellet tank 208, and supplied. Since the filter 228 is installed in the supply hopper 44 on the pipe line 50 side, the resin pellet 4 and the suction air are separated, and the resin pellet 4 is prevented from flowing out to the pipe line 50 side. Further, the filter 214 prevents dust from entering the blower 210.

  Between the replenishment hopper 44 and the drying treatment tank 6, an introduction cylinder 48 that guides the resin pellet 4 from the replenishment hopper 44 to the drying treatment tank 6 is provided. For example, a proximity switch 232 is installed as a unit. The shutter device 230 is an opening / closing means for opening and closing the introduction cylinder 48, and includes a shutter plate 236 for opening and closing the supply port 234 of the supply hopper 44. The shutter plate 236 is opened and closed by a cylinder device 238 which is a drive means. The proximity switch 232 is a means for detecting the presence / absence of the resin pellet 4 and electrically or optically detects whether or not the resin pellet 4 is loaded to a predetermined height. Therefore, when the proximity switch 232 detects the shortage of the resin pellet 4, the shutter device 230 is driven to open the supply port 234, and a predetermined amount of the resin pellet 4 is supplied from the supply hopper 44 to the drying treatment tank 6.

[Configuration and function of drying unit 2]

  The drying processing tank 6 of the drying processing unit 2 is a drying processing means for removing moisture from the resin pellets 4, and this drying processing is used in combination with sealing of the drying processing tank 6 and heating by a heating means. To do. The drying treatment tank 6 includes a cylindrical portion 12 and a funnel portion 14 (FIG. 1), and is provided with a lid portion 16 that opens and closes and seals the cylindrical portion 12. A vacuum pump 242 is connected. A filter 244 is installed in the pipe line 240, and a pressure switch 246 and a vacuum break valve 248 are connected thereto. Accordingly, the drying treatment tank 6 sealed by the lid portion 16 and the shutter device 230 is decompressed by the vacuum pump 242, and the resin pellets 4 to be dried are maintained in a decompressed state (so-called vacuum state).

  In addition, on the inner wall of the cylindrical portion 12 of the drying treatment tank 6, stop rods 26 are installed in four steps up and down in the axial direction of the rotating shaft 34 every 90 degrees on the same circumference. Is rotated, the resin pellet 4 is prevented from rotating and stirring together with the pellet rocking portion 8, and the resin pellet 4 is smoothly rocked. A plurality of heaters 24 are provided as heating means on the outer wall portion, and a temperature sensor 250 for detecting the heating temperature is provided. Accordingly, the heat generated by the heater 24 is also transmitted to the stop rod 26 so that the resin pellet 4 is uniformly dried. A rotation shaft 34 is erected at the center of the lid portion 16. A pellet rocking portion 8 is attached to the tip of the rotating shaft 34 (FIG. 1). In addition, since the rubber heater 58 is installed inside the pellet swinging portion 8, the resin pellet 4 loaded in the drying treatment tank 6 and maintained in a reduced pressure state is uniformly distributed by the heater 24 and the rubber heater 58. The water that has been heated and reduced in boiling point under reduced pressure and vaporized is sucked by the vacuum pump 242 and released into the outside air to be dried.

[Configuration of Rotating Bar 32 and Stopping Bar 26]

  The positional relationship between the rotary rod 32 installed in the pellet swinging portion 8 and the stop rod 26 installed on the inner wall of the cylindrical portion 12 of the drying treatment tank 6 is shown. The rotating rod 32 and the stop rod 26 are alternately arranged at equal intervals in the vertical direction. Further, the clearance between the rotating rod 32 and the inner wall of the drying treatment tank 6 is, for example, 7 to 8 mm so that the resin pellet 4 is bitten and no squeaking noise is generated, and the tips of the rotating rod 32 and the stop rod 26 are spherical. It is chamfered.

[Configuration and function of pellet swinging portion 8]

  The pellet rocking portion 8 is installed at the center of the drying treatment tank 6 and partially rocks the resin pellet 4 to prevent agglomeration and maintain the fluidity of the resin pellet 4. The pellet swinging portion 8 is erected so as to be rotatable by a bearing portion 36 sealed by a seal portion 252 at the center portion of the lid portion 16 of the drying treatment tank 6. A pellet rocking portion 8 is attached to the tip of the rotating shaft 34. The rotary body 28 of the pellet swinging portion 8 is hollow, and a rubber heater 58 is attached to the inner surface. A plurality of rotating rods 32 are provided around the rotating body 28, and when the rotating shaft 34 rotates, the resin pellets 4 are swung so as not to be agglomerated.

  Therefore, the resin pellet 4 moves up and down by the passage of the rotating rod 32 and the like, and partially swings, thereby loosening the resin pellet 4 and preventing agglomeration. The plurality of rotating rods 32 are arranged in a direction orthogonal to the rotating main body 28, and two or four rotating rods 32 are stacked in five stages on the coaxial circumference. The rotating rods 32 at each stage are installed at different angles so as not to overlap. Since the rubber heater 58 is attached to the inner surface of the rotating body 28, the rotating body 28 is heated and the heat is transmitted to the rotating rod 32 and the like to heat the resin pellet 4. The temperature of the rubber heater 58 is detected by a temperature sensor 64 (FIG. 9), and temperature management corresponding to each resin or the like can be performed based on an operation command.

  Further, the rotation of the motor 38 is applied to the rotation shaft 34 via the rotation connecting portion 40. The rotary connecting portion 40 is constituted by, for example, a spur gear, and can be decelerated by a gear ratio. As described above, the rubber heater 58 is fixed inside the rotary body 28 of the pellet swinging portion 8. However, when the rotary shaft 34 is rotated, a load is applied to the wiring to the rubber heater 58. When turned 180 degrees, it is reversed. If a contact-type contact is used for the rotation connection part 40, it can also be rotated.

  Further, when the pellet rocking portion 8 is taken in and out of the drying treatment tank 6, the position detecting piece 128 (FIG. 19) is provided at the tip of the rotating shaft 34 so that the rotating rod 32 of the pellet rocking portion 8 does not collide with the stop rod 26. Is attached, and the position of the position detection piece 128 is detected by the proximity sensor 126 (FIG. 19) and aligned (FIG. 9).

  In this case, a supply port 254 is formed in the lid portion 16 that closes the drying treatment tank 6 so that the resin pellet 4 is supplied around the pellet swinging portion 8. Since the undried resin pellet 4 conveyed by driving the blower 210 is loaded into the drying treatment tank 6 from the supply port 254, the diameter of the rotating body 28 of the pellet swinging unit 8 is set to the inner diameter of the drying treatment tank 6. For example, about 1/2 to 1/3 is preferable. The inner diameters of the rotary body 28 and the drying treatment tank 6 may be set according to the processing amount of the resin pellet 4 and may be set so as not to disturb the fluidity and the stratified state of the resin pellet 4.

[Configuration and Function of Supply Unit 206 of Resin Pellet 4]

  A storage tank 256 for storing the dried resin pellets 4 is installed below the drying processing tank 6, and a shutter device 258 is installed between the storage tank 256 and the drying processing tank 6. The shutter device 258 includes shutter plates 260 and 262. By opening and closing the shutter plates 260 and 262 with the cylinder devices 263 and 265, a predetermined amount of the resin pellet 4 is discharged from the discharge port 42 (FIG. 1) of the drying treatment tank 6. The storage tank 256 is loaded. Reference numeral 266 denotes a leak valve.

  The storage tank 256 is connected to the blower 210 via the previously described pipe line 216 and is connected to the supply hopper 270 on the injection molding machine 202 side via the pipe line 268. The blower 210 is connected via the pipe line 224 described above. The supply hopper 270 is provided with a filter 272 that separates the air and the resin pellets 4, and the proximity switch 276 is provided in the resin supply unit 274 provided between the supply hopper 270 and the injection molding machine 202, and this proximity The switch 276 monitors the supply state of the resin pellet 4 in the resin supply unit 274. Therefore, when the resin pellet 4 in the resin supply unit 274 is insufficient, the on-off valves 212 and 222 are closed, the on-off valves 218 and 226 are opened and the blower 210 is driven, and the air in the supply hopper 270 is supplied to the blower 210. By flowing and circulating air from the blower 210 to the supply hopper 270 via the storage tank 256, the resin pellet 4 is supplied from the storage tank 256 to the supply hopper 270 together with the air.

  According to such a resin drying apparatus 200, the resin pellets 4 to be dried in the drying treatment tank 6 are shaken up and down by the rotation of the rotating rod 32 of the pellet swinging unit 8 and the stop rod 26 of the drying treatment tank 6. Since it is moved, it is maintained in a fluid state and can prevent sticking and agglomeration during drying. In addition, since the resin pellets 4 are not stirred, the resin pellets 4 are maintained in a stratified state in the drying treatment tank 6, and the resin pellets 4 placed in the drying treatment tank 6 are dried and then preceded by those added later. It is discharged | emitted by the storage tank 256, and the undried resin pellet 4 is not discharged | emitted.

  If the discharge port 42 is closed in the drying processing tank 6 by the shutter device 258, the resin pellets 4 loaded from above are held in a stratified state, while maintaining a reduced pressure state, the heater 24, etc. Is heated. At this time, when the rotating shaft 34 is rotated, the rotating rod 32 rotates in the resin pellet 4 in the stratified state, and the resin pellet 4 is moved up and down at the passage portion of the rotating rod 32. In this embodiment, since there are 18 rotating rods 32 and 16 stop rods 26 of the drying treatment tank 6, there are 34 vertically moving portions of the resin pellet 4. Therefore, agglomeration is prevented by the pellet swinging portion 8, and the resin pellet 4 whose fluidization has been promoted by drying is maintained in a stratified state, thereby preventing overall stirring. As a result, the resin pellet 4 put in the drying treatment tank 6 is maintained on the funnel portion 14 side, and when the shutter plates 260 and 262 of the shutter device 258 are opened, the resin pellet 4 is guided to the storage tank 256 from the discharge port 42.

  Next, FIG. 22 is referred to for the electric heat control unit. FIG. 22 is a diagram illustrating an electric heat control unit of the drying treatment tank. 22, the same parts as those in FIG. 1 are denoted by the same reference numerals.

  In the electric heating control unit 300, the heater 24 and the rubber heater 58 are connected to a power supply circuit 306 via a switching circuit 304 of the drive circuit 302, and the control circuit 400 (FIG. 23) performs a control operation to the switching circuit 304 and the power supply circuit 306. The unit 404 is connected. The switching circuit 304 is a switch for switching electrical connection between the heater 24 or the rubber heater 58 and the power supply circuit 306, and is configured by a relay or the like. The power supply circuit 306 includes a DC power supply, an AC power supply, a pulse power supply, or the like. The control calculation unit 404 can be composed of a sequence control circuit or a program control circuit, and is composed of a microcomputer or the like.

  With such a configuration, heating control corresponding to various conditions such as the capacity of the drying treatment tank 6 and the form of the resin pellet 4 to be dried can be performed. As a result, the resin pellets 4 in the drying treatment tank 6 can be dried without being biased, and an efficient treatment can be performed.

  Next, the control device will be described with reference to FIG. FIG. 23 is a diagram illustrating the control device. In FIG. 23, the same parts as those in FIG.

  The control device 400 includes an operation unit 406 as well as a control unit 402 including a control calculation unit 404 formed of a microcomputer. The control calculation unit 404 stores a CPU (Central Processing Unit) 408 that performs calculation processing, a RAM (Random-Access Memory) 410 that stores control information such as various detection outputs as storage means, a control program, fixed data, and the like. A ROM (Read-Only Memory) 412, an EEPROM 414 that is a storage means for preventing loss of control information due to a power failure, a TIMER 416 for time setting, and an input for taking in a detection input and a control input A port 418 and an output port 420 for taking out the control output are provided. The control unit 402 includes a plurality of detection circuits 422, 424, 426, 428, 430, a drive circuit 432, 434, 436, 438, 440, 442, and 444 and an audio circuit 446 along with the control calculation unit 404.

  The detection temperature of the temperature sensors 64 and 250 is the detection circuit 422, the detection output of the rotation detection sensor 448 that detects the rotation of the motor 38 is the detection circuit 424, the detection output of the proximity switches 232 and 276 is the detection circuit 426, and the rotation of the rotary shaft 34 The detection output of the proximity sensor 126 that detects the position is taken in by the detection circuit 428 and the detection output of the pressure switch 246 is taken in from the detection circuit 430 to the CPU 408 or the like via the input port 418. Further, the control output of the control operation unit 404 is applied to the drive circuits 432, 434, 436, 438, 440, 442, 444 and the sound circuit 446 from the output port 420, and the blower 210, the vacuum pump 242, the heater 24, and the rubber heater. 58, cylinder devices 238, 263, 265, on-off valves 212, 218, 222, 226, vacuum break valve 248, motor 38 and speaker 450 are driven.

  An operation unit 406 is a panel switch, which is constituted by a microcomputer, and executes a CPU 452 that performs arithmetic processing, a RAM 454 that stores control information such as various detection outputs as storage means, a ROM 456 that stores control programs, fixed data, and the like, an image memory 458, an input circuit 460 for taking in the detection input and the control input, an output circuit 462 for taking out the control output, a liquid crystal driving circuit 466 for driving the display 464, and a detection circuit 470 for detecting the switch input from the switch 468. Etc. The input circuit 460 of the operation unit 406 is connected to the output port 420 of the control arithmetic unit 404 of the control unit 402, the output circuit 462 is connected to the input port 418, and the operation unit 406 and the control unit 402 are linked.

  The processing and control of the control device 400 covers various controls such as temperature control of the drying treatment tank 6, replenishment, discharge and supply of the resin pellets 4, decompression processing control, display control, and the like. For example, the drive control of the heater 24 and the rubber heater 58 is performed using the detected temperatures of the temperature sensors 64 and 250 as control information, and the inside of the drying treatment tank 6 is controlled to a predetermined temperature. Based on the detection of the resin pellet 4 by the proximity switches 232 and 276, the resin pellet 4 is supplied to the supply hopper 44, supplied to the supply hopper 270, and the like. Based on the pressure reduction command input from the switch 468, the vacuum pump 242 is driven, and the pressure switch 246 can detect whether or not the inside of the drying treatment tank 6 has reached a predetermined pressure. Then, based on a preset swing command input of the resin pellet 4 by the switch 468, the motor 38 is driven to perform a partial swing process of the resin pellet 4 in the drying treatment tank 6 by the rotating rod 32. In addition, the blower 210, the heater 24, the rubber heater 58, the selective driving of the cylinder devices 238, 263, 265, the selective opening / closing operation of the opening / closing valves 212, 218, 222, 226, the opening / closing of the vacuum breaker valve 248, an indicator 464, notification output from the speaker 450 is generated.

  Next, FIG. 24 is referred to for a configuration example of the operation unit. FIG. 24 is a diagram illustrating a configuration example of the operation unit. 24, the same symbols are added to the same portions as FIG.

  The operation unit 406 includes a touch panel unit 472. The touch panel unit 472 includes a display 464 and a switch 474. Various input processes (setting of presence / absence of rocking and rocking conditions) are performed from the switch 474, and the function and operation contents of the switch 474 are displayed on the display 464.

  In addition, the operation unit 406 includes a power switch 476, a changeover switch 478, and a start switch 480. The power switch 476 incorporates a lamp 482 as a display means.

  Next, FIG. 25 is referred about operation and operation | movement of a touchscreen part. FIG. 25 is a flowchart illustrating an operation procedure of the touch panel unit.

  When the power switch 476 is pressed, the lamp 482 is turned on, the initial screen is raised, and after the initial setting, the swing selection screen is developed. If the rocking selection mode is activated (step S11) and nothing is selected (step S12), the motor 38 is not rotated and rocking is not performed. If “Yes” is selected (step S 13), the rotation number setting mode (step S 14) of the rotating shaft 34 is entered, and the number of rotations rotated, for example, 90 ° as a predetermined angular rotation at a time by ten-key input (step S 15). And the number of rotations is set by confirming the setting (step S16). Similarly, for the stop time (step S17), the pellet rocking unit 8 operates with the set number of rotations and stop time by inputting the time by the numeric keypad input (step S18) and confirming the setting (step S19). Then, the rotary rod 32 rotates together with the rotary body 28.

  Thereafter, when the start switch 480 is pressed, the operation is started and the swinging is started. When the start switch 480 is pressed again, the operation is stopped. That is, the operation of the pellet swinging unit 8 can be continued until the start switch 480 is operated.

  Next, with reference to FIG. FIG. 26 is a flowchart showing a processing procedure when the swing is not set.

  When the swing selection is set to “none”, when the start switch 480 is turned on, it is determined whether or not the initial filling is performed (step S21), and in the case of the initial filling, the initial resin supply mode is executed ( Step S22). That is, when the proximity switch 232 does not detect the resin pellet 4, the process shifts to the initial resin replenishment mode, the on-off valves 212 and 220 are opened, and the blower 210 is driven to remove the resin pellet 4 from the pellet tank 208. Supply to the supply hopper 44. After this replenishment, the cylinder device 238 is driven to open the shutter plate 236 of the shutter device 230, the resin pellet 4 is loaded into the drying treatment tank 6, and when the proximity switch 232 detects the restrained state of the resin pellet 4, The replenishment mode is released and the drive of the blower 210 is stopped.

  The process proceeds to the reduced pressure drying mode (step S23), and the resin pellet 4 in the drying processing tank 6 is held under reduced pressure to perform the drying process. Even if it is not initial filling in step S21, it transfers to step S23 and performs a drying process. That is, the cylinder devices 238, 263, and 265 are driven to close the shutter plates 236, 260, and 262, and the vacuum pump 242 is driven to perform pressure reduction until the pressure switch 246 detects a predetermined pressure reduction. The heater 58 is driven to perform heat treatment at a set temperature. As a result, moisture contained in the resin pellet 4 in the drying treatment tank 6 evaporates and the resin pellet 4 is dried.

  When this reduced-pressure drying mode ends, it is determined whether or not the resin pellet 4 stays in the drying treatment tank 6 and a resin supply command has been issued (step S24). If a resin supply command has been issued, the resin supply mode is executed (step S25). If there is no resin supply command, the process returns to the reduced pressure drying mode (step S23).

  In the resin supply mode, after the drying treatment tank 6 is returned to the atmosphere, the shutter plates 260 and 262 of the shutter device 258 are opened and the dried resin pellets 4 are dropped from the drying treatment tank 6 into the storage tank 256. When the on-off valve 222 is closed and the on-off valve 218 is opened and the blower 210 is driven, the fluidized resin pellets 4 can be stably supplied to the supply hopper 270 through the conduit 268.

  When the resin supply mode is entered, since the amount of the resin pellets 4 in the drying treatment tank 6 decreases, it is monitored whether or not the storage amount of the drying treatment tank 6 is equal to or greater than the reference (step S26). When the storage amount of the drying treatment tank 6 is below the reference, the process shifts to the resin replenishment mode (Step S27). In this resin supply mode, the shutter plate 236 of the shutter device 230 is closed, the on-off valves 212 and 222 are opened, and the blower 210 is driven to supply the resin pellet 4 from the pellet tank 208 to the supply hopper 44 through the pipe line 52. To do. The resin pellets 4 supplied to the supply hopper 44 are loaded into the drying processing tank 6 by opening the shutter plate 236. When the resin supply is completed, the process returns to step S21.

  Next, with reference to FIG. FIG. 27 is a flowchart showing a processing procedure when the swing is set to be continuous.

  If you want to set the swing continuously by swing selection, set the setting to “Yes” and set the stop time to 0. When the start switch 480 is turned on and then off, the motor 38 (pellet rocking unit 8) The rotation is continued (step S31). Steps S32 to S38 are the same as steps S21 to S27 (FIG. 26), and thus the description thereof is omitted.

  In practice, any kind of bridging material can be loosened by rotating 90 degrees every 5 minutes 1-2 times.

  Next, with reference to FIG. FIG. 28 is a flowchart illustrating a processing procedure when the swing is set to intermittent.

  If you want to set the swing to intermittent in the swing selection, set it to “Yes”, and if the stop time is set to 0 or more, it will stop for the set time and the rotating shaft 34 will rotate the set number of times. Initial filling (step S41), initial resin replenishment mode (step S42), reduced pressure drying mode (step S43), determination processing for presence / absence of resin supply command (step S44), resin supply mode (step S47), and drying treatment tank 6 The determination process (step S48) and the resin replenishment mode (step S49) exceeding the storage amount standard are the same as the above-described steps S21 to S27 (FIG. 26).

  After completion of the reduced-pressure drying mode in step S43, the resin pellet 4 stays in the drying treatment tank 6, and it is determined whether or not there is a resin supply command, and at the same time measurement of the residence time is started (step S44). This is because when a predetermined time, for example, 5 minutes elapses, or when the stop time of the swing time is set to, for example, 5 minutes, the resin supply command is not issued within 5 minutes. The motor 38 is turned on (step S45), and the pellet rocking portion 8 is rotated for a set rocking time, for example, 1 minute, and the resin pellet 4 is rocked. When the set time has elapsed, the motor 38 is stopped (step S46), the process returns to step S43 again, and a resin supply command is awaited.

  If the resin supply command is issued within the predetermined time in step S44, the resin supply mode is executed (step S47). When the resin supply mode is entered, since the amount of the resin pellets 4 in the drying treatment tank 6 decreases, it is monitored whether or not the storage amount of the drying treatment tank 6 is equal to or greater than the reference (step S48). When the storage amount becomes equal to or less than the reference, the process shifts to the resin supply mode (step S49). When the above-described resin supply ends, the process returns to the initial filling in step S41.

  As described above, the swinging and drying of the resin pellet 4 can be continuously or intermittently rotated with the rotation number and stop time set in advance, and a rational drying process can be realized.

  According to the experimental result, when it is clear that the resin does not bridge, “No” is selected, and “Yes” is selected as the resin that may bridge. Even if “present” is selected, there is no selection of “continuous” / “intermittent”. For example, when inputting the number of “90 ° rotation” and the “stop” time, the number of times is 1 to 5 times, and the stop time is 240 times. An input limit is set at ~ 360 [seconds]. This basis is based on the result of loosening the bridging resin.

  Next, FIG. 29 will be referred to regarding the temperature control of the heater 24 and the rubber heater 58. FIG. 29 is a flowchart showing a temperature control processing procedure.

  This processing procedure is an example of a temperature control method. As shown in FIG. 29, set temperatures of the heater 24 and the rubber heater 58 are input from a display (touch screen) 464 (for example, a settable temperature of 20 When the start switch 480 is pressed (step S51), automatic operation is started (step SS52).

  The sequencer in the control calculation unit 404 reads the heater temperature every fixed period, for example, every 4 seconds, and reads the detected temperature of the temperature sensor 64 or 250 every fixed period, for example, every 4 seconds, the input set temperature, (Set temperature-20 [° C]), and when the temperature detected by the temperature sensor 64 or 250 is lowered to the minimum value, the relay is turned on at a constant energization pattern, for example, energization intervals of 2 seconds on / 2 seconds off. Heat.

  Therefore, it is determined whether or not the timer 416 has timed 4 seconds from the start of automatic operation (step S53). If the time has elapsed for 4 seconds (YES in step S53), the timer 416 is restarted (step S54). The heater temperature is read (step S55), whether the heater temperature has reached the set temperature, lower than the set temperature-predetermined temperature (for example, 20 [deg.] C.), or set temperature-predetermined temperature (for example, 20 [deg.] C.). ) Is determined (step S56).

  If the temperature of the heater 24 or the rubber heater 58 (= the temperature detected by the temperature sensor 64 or 250) is the heater temperature <(the set temperature−20 [° C.]), it continues for a predetermined time, for example, the heater is turned on for 2 seconds. (Step S57) If (set temperature−20 [° C.]) ≦ heater temperature <set temperature, the heater is turned on only for 0.1 to 2 seconds (step S58). If the temperature is equal to or higher than the set temperature (heater temperature ≧ set temperature), the heater is turned off (step S59).

  In this case, when the temperature reaches (set temperature−20 [° C.]), the heating time of the relay is decreased to stop heating. In proportion to the difference between the current temperature and the set temperature, the energization time is shortened as the set temperature is approached, and this energization is continued to the set temperature.

  In this temperature control, the operation of the start switch 480 is monitored (switch 60). If the start switch 480 is in the ON state, the process returns to step S53. In step S53, if the timer 416 has not elapsed for 4 seconds (NO in step S53), the process proceeds to step S60. If the start switch 480 is ON (YES in step S60), the process proceeds to step S53. Return.

  And if start-up step S480 is turned OFF (NO of step S60), automatic operation will be complete | finished (step S61) and heater heating will be stopped.

  Next, the advantages and the like in the second embodiment are listed as follows.

  (1) For the rotation timing of the rotary rod 32, the user inputs the rotation time and stop time from the display (touch screen) 464 using the numeric keypad, or selects the material and type of the resin pellet 4 from the display (touch screen) 464. Then, although the control which operates according to the conditions was explained, as described above, the stop rod 26 is attached to the drying treatment tank 6 side, and the resin pellet 4 in the stratified state is swung without disturbing the stratified state. If the loosening action by the rotating rod 32 is obtained, for example, if the resin pellet 4 is loosened so as not to be bridged by rotating the rotary body 28 by 90 degrees every 5 minutes, the lower shutter portion (shutter plate) When 260, 262) is opened, the resin pellet 4 having high fluidity can be discharged well.

  (2) The operating time of the motor can be greatly shortened, which extends the life of parts such as the motor, bearings, and gears. Furthermore, it is time-consuming for after-sales services such as setting the conditions for rotation time and stop time depending on the material and type of the resin pellet 4, upgrading the software version to add the brand each time, and making it known to the user and writing software. Is completely unnecessary.

As described above, the most preferable embodiment and the like of the present invention have been described. However, the present invention is not limited to the above description, and is described in the claims or disclosed in the specification. It goes without saying that various modifications and changes can be made by those skilled in the art based on the above gist, and such modifications and changes are included in the scope of the present invention.

The present invention relates to resin drying in which granular or powdered resin is heated under reduced pressure to remove moisture, and the resin is oscillated without impairing the stratified state, thereby fluidizing the dried resin and preventing agglomeration. Can and is useful.

It is the figure which notched and showed a part of drying process part of the resin drying apparatus. It is a figure which shows the II-II sectional view taken on the line of FIG. It is a figure which shows the rotation part of a rocking | swiveling part. It is a figure which shows the A section of FIG. It is a figure which shows the B section of FIG. It is a figure which shows the C section of FIG. It is a figure which shows the D section of FIG. It is a figure which shows the E section of FIG. It is sectional drawing which shows the rotation part of a rocking | swiveling part. It is a figure which shows the drying process tank with which the resin pellet was loaded. It is a figure which shows the rocking | fluctuation state of a resin pellet. It is a figure which shows the rocking | fluctuation state of a resin pellet. It is a figure which shows another rotating rod. It is a figure which shows another rotating rod. It is a figure which shows the rotation mechanism part using a rotary actuator. It is a figure which shows the rotational drive part using an air cylinder. It is a figure which shows the opening / closing mechanism of a cover part. It is a top view which shows a cover part. It is a figure which shows the alignment mechanism part. It is a figure which shows the alignment mechanism part. It is a figure which shows the resin drying apparatus connected to the injection molding machine. It is a figure which shows the electrothermal control part of a drying process tank. It is a figure which shows a control apparatus. It is a figure which shows the structural example of an operation part. It is a flowchart which shows the operation procedure of a touchscreen part. It is a flowchart which shows the process sequence when not setting rocking | fluctuation. It is a flowchart which shows the process sequence at the time of setting rocking | swiveling continuously. It is a flowchart which shows the process sequence when rocking | fluctuation is set to intermittent. It is a flowchart which shows the process sequence of temperature control.

Explanation of symbols

2 Drying processing section 4 Resin pellet 6 Drying processing tank 8 Pellet swinging section 10 Replenishing section 12 Cylindrical section 14 Funnel section 16 Lid section 24 Heater 26 Control rods 26A1, 26A2, 26A3, 26A4 First plurality of control rods 26B1, 26B2 , 26B3, 26B4 Second plurality of stop rods 26C1, 26C2, 26C3, 26C4 Third plurality of stop rods 26D1, 26D2, 26D3, 26D4 Fourth plurality of stop rods 28 Rotating body 30 Rotating drive unit 32 Rotating rod 32A1 , 32A2, 32A3, 32A4, 32A5, 32A6, 32A7, 32A8 First plurality of rotating rods 32B1, 32B2, 32B3, 32B4 Second plurality of rotating rods 32C1, 32C2 Third plurality of rotating rods 32D1, 32D2 Fourth The plurality of rotating rods 32E1, 32E2 The fifth plurality of rotating rods 34 Rotating shaft 8 motor 54 rotates the cylindrical portion 58 a rubber heater 200 resin drying device 202 injection molding machine 210 blower 242 vacuum pump 246 pressure switch

Claims (6)

A resin drying apparatus for drying granular or powdery resin,
A treatment tank for drying the resin;
A rotating part that rotates in the treatment tank;
A rotating rod that protrudes from the rotating part toward the inner wall surface of the processing tank, rotates together with the rotating part, and moves in the resin in the processing tank,
A stop rod that protrudes from the treatment tank toward the rotating portion and is inserted into the resin in the treatment tank;
A resin drying apparatus comprising:
In the resin drying apparatus of Claim 1,
The treatment tank includes a cylindrical portion and a conical portion, and protrudes end portions of the plurality of blocking rods toward the center of the rotating portion, and is installed at a plurality of positions in the height direction of the cylindrical portion. A resin drying apparatus characterized by comprising:
In the resin drying apparatus of Claim 2,
The resin drying apparatus according to claim 1, wherein the rotating rods are disposed within a height-direction interval of the stop rods and have different protruding lengths.
In the resin drying apparatus of Claim 1,
A resin drying apparatus, wherein a heating means is installed in the rotating portion, and the rotating rod is a heat conducting means for conducting heat of the heating means to the resin.
In the resin drying apparatus of Claim 1,
A resin drying apparatus, wherein a heating means is installed in the treatment tank, and the control rod is a heat conduction means for conducting heat of the heating means to the resin.
In the resin drying apparatus of Claim 1,
A resin drying apparatus, comprising: a decompression unit that decompresses the treatment tank, wherein the treatment tank is maintained in a decompressed state by the decompression unit during resin drying.

Images