JP4814656B2 - Shutter mechanism and resin dryer - Google Patents

Description

The present invention relates to a shutter structure used for opening and closing an opening, and the like, and more particularly, to a shutter mechanism used for passing or blocking particulate matter such as a molding resin material, and a resin dryer using the shutter mechanism.

  Resin dryers for molding resin materials and the like are provided with a shutter mechanism at the inlet or outlet of the drying tank. The shutter mechanism is used for blocking the molding resin material and depressurizing the interior of the drying tank. Airtightness is required.

With respect to this resin dryer, in Patent Document 1, the molding resin material is dried while the drying tank is depressurized, and a shutter mechanism is installed at the resin inlet or outlet of the drying tank.
JP-A-2001-71347 (paragraph number 0015, FIG. 1, etc.)

  By the way, the shutter mechanism mounted on the resin dryer uses a rubber O-ring in order to maintain a reduced pressure state, and the O-ring is caused by adhesion of molding resin material, change over time, and wear due to mechanical contact. There is a risk that the airtightness in the case will decrease. If the reduced pressure state in the drying tank is impaired, the dryness of the molding resin material is deteriorated and the quality of the molded product may be deteriorated. The shutter mechanism comes into contact with the metal material due to wear of the O-ring and generates metal powder, which may deteriorate the quality of the molded product. In addition, if a part of the molding resin material leaks due to a decrease in airtightness, the environment is deteriorated.

  In a shutter mechanism with a complicated structure, maintenance management and cleaning are complicated, and as a result, the quality of the molded product is affected.

  Accordingly, a first object of the present invention relates to a shutter mechanism, which is to prevent wear and change with time, and to prevent deterioration of airtightness.

  A second object of the present invention is to provide a resin dryer that prevents the shutter mechanism from being worn or changed over time and prevents the drying function from being lowered.

A third object of the present invention is to facilitate maintenance by simplifying the configuration.

  According to the present invention, a moving plate is movably installed in parallel to the first opening with respect to the frame having the first opening, and the moving plate has second and third corresponding to the first opening. The second opening is movably provided with a closing plate that closes the first opening, and the second opening corresponds to the first opening. The first opening is closed by the closing plate, and the first opening is opened when the third opening corresponds to the first opening. With this configuration, the above object is achieved.

  To achieve the above object, according to a first aspect of the present invention, there is provided a shutter mechanism, comprising a frame having a first opening, a second opening larger than the first opening, and the frame. A moving plate that moves parallel to the first opening, and an opening of the moving plate that is movable in a direction intersecting the moving direction of the moving plate, and the second opening is connected to the first opening. The above object can be achieved by a configuration including a closing plate that closes the first opening of the frame when it corresponds to the opening.

  Preferably, the shutter mechanism may include a driving unit that moves the moving plate in parallel with the frame and associates the closing plate with the first opening. The above object can also be achieved by such a configuration.

  In the shutter mechanism, preferably, the closing plate may have a size that closes the first opening of the frame. The above object can also be achieved by such a configuration.

  In the shutter mechanism, preferably, the closing plate may have a peripheral wall surface as an inclined surface. The above object can also be achieved by such a configuration.

  In the shutter mechanism, it is preferable that the moving plate includes a third opening corresponding to the first opening of the frame. The above object can also be achieved by such a configuration.

  In order to achieve the above object, a second aspect of the present invention is a resin dryer for drying a molding resin material, the drying tank for drying the molding resin material, and the molding resin of the drying tank. A frame provided with a material inlet or outlet and having a first opening, a second opening larger than the first opening, and parallel to the first opening of the frame A moving plate that is moved, and is installed in an opening portion of the moving plate so as to be movable in a direction crossing the moving direction of the moving plate, and when the second opening portion is made to correspond to the first opening portion, The above object can be achieved by a configuration including a closing plate for closing the first opening of the frame.

  Preferably, the resin dryer includes a decompression unit for decompressing the drying tank, and the first plate opening is formed by sucking the closing plate by decompressing the drying tank by the decompression unit. It is good also as a structure made to close with the said closing plate. The above object can also be achieved by such a configuration.

  In the resin dryer, preferably, the moving plate may be moved in parallel with the frame, and a drive unit may be provided to associate the closing plate with the first opening. The above object can also be achieved by such a configuration.

  In the resin dryer, preferably, the closing plate may have a size that closes the first opening of the frame. The above object can also be achieved by such a configuration.

  In the resin dryer, preferably, the closing plate may have a configuration in which a peripheral wall surface is an inclined surface. The above object can also be achieved by such a configuration.

  In the resin dryer, preferably, the moving plate is provided with a third opening, and when the moving plate is moved, the molding resin material in the first opening of the frame is moved to the third opening. It is good also as a structure sheared between the opening part of this, and the opening edge part of the said 1st opening part. The above object can also be achieved by such a configuration.

  In the resin dryer, preferably, the frame may be installed with the moving plate interposed therebetween and may include an air port communicating with the third opening of the moving plate. The above object can also be achieved by such a configuration.

  The resin dryer may preferably include an air source that supplies cleaning air to the air port when the first opening is closed by the closing plate.

In the resin dryer, preferably, the third opening formed in the moving plate includes a flat wall surface portion that intersects with the wall surface portion of the first opening portion by the movement of the moving plate. Also good. The above object can also be achieved by such a configuration.

  According to the present invention, the following effects can be obtained.

  (1) With respect to the shutter mechanism, it is possible to prevent wear and change with time, and to prevent deterioration of airtightness.

  (2) The shutter mechanism can be simplified and maintenance can be facilitated.

(3) According to the resin dryer using the shutter mechanism having such a configuration, it is possible to prevent the shutter mechanism from being worn or changed with time, and to prevent the drying function from being deteriorated.

[First Embodiment]

  A first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, FIG. 3, FIG. 1 is an exploded perspective view showing a shutter mechanism according to the first embodiment, FIG. 2 is an enlarged view showing a closing plate, FIG. 3 is a sectional view showing a shutter frame, a slider, and the closing plate, and FIG. FIG. 5 is a cross-sectional view showing the structure and operation of the shutter mechanism. FIG.

  The shutter mechanism 2 includes a shutter frame 4 and a slider 6 as a moving plate that moves in parallel with the shutter frame 4. The slider 6 is an example of a drive unit that slides the slider 6 with respect to the shutter frame 4. As shown in FIG. In this case, the cylinder device 8 uses air as a drive source.

  The shutter frame 4 includes a flat upper plate 10 and a lower plate 12, side plates 14 and 16, and end plates 18 and 20, and the upper plate 10 and the lower plate 12 have, for example, circular first openings at opposing positions. 22 is formed. The upper plate 10 and the lower plate 12 are fixed by a plurality of bolts 19 with the side plates 14 and 16 interposed therebetween, and the upper plate 10 and the lower plate 12 are maintained in parallel by the thickness of the side plates 14 and 16, and the side plates End plates 18 and 20 are fixed to the end surface portions of 14 and 16 by a plurality of bolts 24. In this case, the upper plate 10 and the side plates 14 and 16 are formed with through holes 21 for allowing the bolts 19 to pass therethrough, and the lower plate 12 is formed with screw holes 23 for fixing the bolts 19. In addition, a through hole 25 for penetrating the bolt 24 and a screw hole 26 for fixing the bolt 24 are formed in the end face portions of the side plates 14 and 16. With this configuration, the shutter frame 4 is formed with a space 27 (A in FIG. 3) for sliding the slider 6 between the upper plate 10 and the lower plate 12.

  In order to slide the slider 6, the thickness of the slider 6 is set slightly smaller than the distance between the upper plate 10 and the lower plate 12. The upper plate 10 and the lower plate 12 are formed with air ports 29 and 31 for discharging dust and the like accumulated in the space portion 27.

  Second and third openings 32 and 34 are formed in the slider 6, and a closing plate 36 that closes the opening 22 on the upper plate 10 or the lower plate 12 side is moved in the opening 32. It is installed so that it can move in both directions and directions. As shown in FIG. 2, the closing plate 36 is a disc corresponding to the shape of the opening 32, and its peripheral wall portion is formed as an inclined surface 38 formed of a conical surface, has a trapezoidal cross section, and has a large diameter surface 40. And a small-diameter surface 42. In this embodiment, the opening 34 corresponds to the opening 22 and is a through hole having the same diameter as the opening 22.

  Therefore, as shown in FIGS. 3A and 3B, if the diameters of the openings 22, 32, and 34 are R1, R2, and R3, the magnitude relationship between them is R2> R1 = R3, and the closing plate 36 If the diameter of the large-diameter surface 40 is R4 and the diameter of the small-diameter surface 42 is R5, the relationship between the diameters R1 (= R3) and R2 of the openings 22 and 32 is R2> R4> R1, R2> R5. > R1 relationship. This is for closing each opening 22 with the closing plate 36.

  Further, if the thickness of the slider 6 is t1, and the thickness of the closing plate 36 is t2, these magnitude relationships are t1> t2. This is because the closing plate 36 can be moved in the direction crossing the sliding direction of the slider 6 in the opening 32 as indicated by an arrow C.

  Also, as shown in FIG. 4, between the upper plate 10 and the lower plate 12, side plates 14 and 16 that are slightly thicker than the thickness t1 of the slider 6 are installed, and the interval t3 (> t1) is set. The slider 6 is slidable.

  In order to move the slider 6 with respect to the shutter frame 4, the cylinder device 8 is fixed to the end plate 18 of the shutter frame 4 as a drive unit, and the piston shaft 44 slidably penetrates the end plate 18. The slider 6 is fixed, and as shown by an arrow X (FIG. 1), the cylinder device 8 is set so as to be able to advance and retreat.

  As shown in FIG. 5A, the movement range of the piston 43 of the cylinder device 8 is Df as the front dead center as the limit point on the advance side, Db as the rear dead center as the limit point on the backward side, and these front dead centers. If the moving distance (stroke length) between Df and the rear dead center Db is ST, the front dead center Df is made to correspond to the central axis O1 of the opening 22, the opening 32, and the central axis O2 of the closing plate 36, and the rear dead If the point Db is made to correspond to the central axis O3 of the opening 34, the slider 43 is moved forward by moving the piston 43 of the cylinder device 8 to the front dead center Df, so that the closing plate 36 is positioned at the position of the opening 22. And the opening 22 is closed.

  In this embodiment, stopper portions 51 and 53 are formed on the piston 43 of the cylinder device 8. When the stopper portion 51 collides with the front wall portion of the cylinder 55, the front dead center Df is determined, and the stopper portion The rear dead center Df is determined by the collision of 53 with the rear wall portion of the cylinder 55, and the stroke length ST is determined by the cylinder length of the cylinder 55. Such positioning is an example, and the present invention is not limited to such positioning.

  Therefore, as shown in FIG. 5A, the position where the piston 43 of the cylinder device 8 has reached the front dead center Df by injecting air from the air port portion 46 of the cylinder device 8 and discharging the air from the air port portion 48. Thus, the centers of the openings 22 and 32 coincide with each other, and the opening 22 can be closed by the closing plate 36. Then, by moving the closing plate 36 upward or downward by air pressure, the closing plate 36 can be brought into close contact with the edge surface of the opening 22, and the opening 22 can be closed by the closing plate 36.

  Further, as shown in FIG. 5B, the position where the piston 43 reaches the rear dead center Db of the cylinder device 8 by injecting air from the air port portion 48 of the cylinder device 8 and discharging air from the air port portion 46. Since the centers of the openings 22 and 34 coincide with each other, the openings 22 and 34 are in a through state.

  In addition, since the upper plate 10, the lower plate 12, and the slider 6 are formed of a quenching plate or the like, they are deposited across the opening 22 and the opening 34 by sliding the opening 22 and the opening 34 together. For example, the opening 22 can be opened and closed while shearing a molding resin material or the like as a deposit.

  Also, deposits such as dust and chips of molding resin material deposited in the space 27 of the shutter mechanism 2 can be discharged by injecting high-pressure air into the air ports 29 and 31 (FIG. 1). 6 sliding parts can be kept clean.

[Second Embodiment]

  Next, a second embodiment will be described with reference to FIGS. 6, 7, 8, 9, 10, 11, and 12. FIG. 6 is a diagram illustrating a configuration example of a resin dryer, FIG. 7 is a cross-sectional view illustrating a first shutter mechanism, FIG. 8 is a cross-sectional view illustrating a second shutter mechanism, and FIG. 9 is a block diagram illustrating a control device. FIG. 10 is a flowchart showing the operation of the resin drying apparatus, and FIGS. 11 and 12 are diagrams showing the shutter operation. 6 to 12, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals.

  As shown in FIG. 6, the resin dryer 50 is supplied with resin pellets 54, which are molding resin materials, from a sealed material tank 52, and after drying the resin pellets 54, the resin dryer 54 is supplied to the resin molding machine 56. Supply. That is, the resin dryer 50 constitutes a drying / feeding system for the resin pellets 54.

  The resin dryer 50 is provided with a drying treatment tank 60 for drying the resin pellets 54 under reduced pressure, and a hopper tank 62 for placing the resin pellets 54 before drying is installed on the upper part of the drying treatment tank 60. A storage tank 64 for storing the resin pellets 54 after drying is installed at the lower part of the drying treatment tank 60. A first shutter mechanism 201 is installed between the drying processing tank 60 and the hopper tank 62, and a second shutter mechanism 202 is installed between the drying processing tank 60 and the storage tank 64. The shutter mechanisms 201 and 202 are configured by the shutter mechanism 2 of the first embodiment. By opening the shutter mechanism 201, the resin pellets 54 are supplied from the hopper tank 62 to the drying process layer 60, and by opening the shutter mechanism 202, the resin pellets 54 are transferred from the drying process layer 60 to the storage tank 64.

  Between the hopper tank 62 and the material tank 52, a first transport pipe 66 for the resin pellet 54 is installed and a suction pipe 68 is connected. The suction pipe 68 includes a nitrogen supply device 70, a first transport switching valve. 72, a second transport switching valve 74, a filter 76 and a blower 78 are installed.

  A second transport pipe 82 for the resin pellets 54 is installed between the storage tank 64 and the hopper tank 80 of the resin molding machine 56, and a suction pipe 84 is connected. The suction pipe 84 shares the filter 76 and the blower 78 and is provided with third and fourth transport switching valves 86 and 88.

  Therefore, when the transport switching valves 72 and 74 are opened, the transport switching valves 86 and 88 are closed, and the blower 78 is driven, nitrogen is introduced from the nitrogen supply device 70 into the material tank 52, and the resin pellets 54 in the material tank 52 It is transferred to the hopper tank 62 together with the nitrogen flow. The nitrogen stream separated by the net 90 in the hopper tank 62 is circulated to the blower 78.

  Further, when the transport switching valves 72 and 74 are closed, the transport switching valves 86 and 88 are opened, and the blower 78 is driven, nitrogen is introduced from the nitrogen supply device 70 into the storage tank 64, so that the resin pellets 54 in the storage tank 64 The nitrogen flow transferred to the hopper tank 80 together with the nitrogen flow and separated by the net 92 is circulated to the blower 78.

  The drying treatment tank 60 has a structure in which the inlet side of the resin pellet 54 is closed by a shutter mechanism 201 that can be opened and closed, and the outlet side of the resin pellet 54 is closed and sealed by a shutter mechanism 202 that can be opened and closed. A vacuum pump 94 for depressurizing the inside is connected by a pipe line 98 through a filter 96, and a pressure gauge 100 and a vacuum breaker valve 102 are connected to the pipe line 98. In addition, a plurality of heaters 104 and 105 and heat radiation fins 106 and 107 for drying the resin pellets 54 are installed in the tank of the drying treatment tank 60, and temperature sensors 108 and 110 for detecting the heating temperature are installed. ing. Further, a planar heater 112 is installed on the wall surface of the drying treatment tank 60, and a heat insulating material 114 is installed on the outer periphery of the planar heater 112, and a temperature sensor 116 for detecting the heating temperature is installed. ing. By installing the heat insulating material 114, the heat retaining property of the dry treatment layer 60 is enhanced, and the resin pellets 54 can be heated uniformly. In addition, a leak air valve 118 for adjusting decompression in the tank is connected to the drying treatment tank 60 by a pipe line 120.

  A proximity sensor 124 that detects the resin pellet 54 is installed in the connecting cylinder portion 122 between the drying process layer 60 and the shutter mechanism 201, and the connecting cylinder portion 126 made of a glass tube at the lower portion of the hopper tank 80 of the resin molding machine 56. Also, a proximity sensor 128 for detecting the resin pellet 54 is installed.

  As shown in FIG. 7, the cylinder device 8 of the shutter mechanism 201 is provided with a check valve 130 on the air port 46 side and a check valve 132 on the air port 48 side. 48 is connected to an air source 136 as a drive source via a switching valve 134, and the cylinder device 8 moves the slider 6 forward and backward by switching the switching valve 134. In the check valves 130 and 132, 137 and 139 are spherical valve bodies. An air port 29 of the upper plate 10 is connected to the air port portion 46 via an air tube 138, and an air port 31 of the upper plate 10 is connected to the air port portion 48 via an air tube 140. Filters 142 for filtering dust are respectively installed in the air ports 29 and 31 of the lower plate 12.

  Further, the cylinder device 8 of the shutter mechanism 201 is provided with limit switches 152 and 154 that electrically detect the movement of the piston 43, and the limit switch 152 has an output indicating an open state or an opening operation of the shutter mechanism 201. As a result, an output representing the closed state or closing operation of the shutter mechanism 201 is obtained from the limit switch 154.

  Further, as shown in FIG. 8, the cylinder device 8 of the shutter mechanism 202 is provided with a check valve 230 on the air port portion 46 side and a check valve 232 on the air port portion 48 side. 48 is connected to an air source 136 as a drive source via a switching valve 234, and the cylinder device 8 moves the slider 6 forward and backward by switching the switching valve 234. In the check valves 230 and 232, 237 and 239 are valve bodies. The air port 29 is connected to the air port 29 of the upper plate 10 via the air tube 238, and the air port 48 is connected to the air port 31 of the upper plate 10 via the air tube 240. Filters 242 for filtering dust are respectively installed in the air ports 29 and 31 of the lower plate 12.

  Further, limit switches 252 and 254 that electrically detect the movement of the piston 43 are also installed in the cylinder device 8 of the shutter mechanism 202, and the limit switch 252 outputs an output indicating the open state or opening operation of the shutter mechanism 202. As a result, an output indicating the closed state or the closing operation of the shutter mechanism 202 is obtained from the limit switch 254.

  As shown in FIG. 9, the control device 300 of the resin dryer 50 includes a control unit 302 configured by a computer. The control unit 302 includes a CPU (Central Processing Unit) and a ROM (Read-Only Memory). In addition to RAM (Random-Access Memory), it includes a drive unit for various functional units. The CPU executes a program stored in the ROM, and executes supply control and drying control of the resin pellets 54. The RAM is used as a work area.

  Therefore, the control unit 302 includes a detection signal from the temperature sensors 108, 110, 116, a detection signal indicating the presence / absence of the resin pellet 54 from the proximity sensors 124, 128, a limit switch 152 for detecting the opening operation or open state of the shutter mechanism 201, A limit switch 154 for detecting the closing operation or the closed state, a limit switch 252 for detecting the opening operation or the opening state of the shutter mechanism 202, and a detection signal from the limit switch 254 for detecting the closed state are added. The output of the control unit 302 is applied to the nitrogen supply device 70, the transport switching valves 72, 74, 86, 88, the blower 78, the vacuum breaker valve 102, the heaters 104, 105, 112, the switching valves 134, 234, etc. And temperature control is performed.

  Next, the operation will be described.

  In this resin dryer 50, as shown in FIG. 10, the resin pellet 54 is taken into the hopper tank 62 from the material tank 52 (step S1), the resin pellet 54 is dropped into the drying treatment tank 60, and the decompression in the drying treatment tank 60 is performed. The resin pellet 54 is dried below (step S2), and the dried resin pellet 54 is taken out to the storage tank 64 and then supplied to the hopper tank 80 of the resin molding machine 56 (step S3). On the resin molding machine 56 side, the proximity sensor 128 monitors the consumption of the resin pellet 54, and the resin pellet 54 is supplied from the storage tank 64 to the hopper tank 80 as necessary.

  (1) Resin take-in operation

  When the transport switching valves 72 and 74 are opened, the transport switching valves 86 and 88 are closed, and the blower 78 is driven, nitrogen is introduced from the nitrogen supply device 70 into the material tank 52 and the resin pellet 54 is transferred to the hopper tank 62 along with the nitrogen flow. Is done.

  When the operation of the vacuum pump 94 is stopped, the vacuum break valve 102 is opened, the drying treatment tank 60 is returned to atmospheric pressure, and the shutter mechanism 201 is opened, the resin pellets 54 fall from the hopper tank 62 due to gravity, and the drying treatment tank 60 Is taken in. When the resin pellet 54 reaches the position of the proximity sensor 124, the shutter mechanism 201 is closed to complete the taking of the resin pellet 54.

  (2) Resin drying operation

  When the shutter mechanism 201 and the vacuum breaker valve 102 are closed and it is confirmed that the shutter mechanism 202 is closed and then the vacuum pump 94 is operated, the closing plate 36 of the shutter mechanism 201 is attracted to the lower plate 12 side. Since the closing plate 36 of the mechanism 202 is attracted to the upper plate 10 side, the drying treatment tank 60 is in a sealed state. When the drying tank 60 is maintained under reduced pressure and heated by the heaters 104, 105, and 112, moisture evaporates from the resin pellets 54. Since the drying treatment tank 60 is in a reduced pressure state, the water evaporates due to the lowering of the boiling point, whereby the resin pellets 54 can be dried without being overheated.

  (3) Resin removal and supply operation

  In order to take out the dried resin pellet 54 from the drying treatment tank 60, the vacuum pump 94 is stopped, the vacuum breaker valve 102 is opened, the drying treatment tank 60 is returned to atmospheric pressure, and then the shutter mechanism 202 is opened. . When the shutter mechanism 202 is opened, the dried resin pellets 54 are dropped by gravity from the drying treatment tank 60 having a funnel-shaped inner wall surface and taken out to the storage tank 64. After taking out the resin pellet 54, the shutter mechanism 202 is closed and the above-described drying process is continued.

  When the proximity sensor 128 of the resin molding machine 56 detects the shortage of the resin pellet 54, the supply of the resin pellet 54 is started. That is, after the shutter mechanism 202 is closed, the transport switching valves 72 and 74 are closed, the transport switching valves 86 and 88 are opened, and the blower 78 is driven, whereby nitrogen is introduced from the nitrogen supply device 70 into the storage tank 64, Resin pellets 54 are supplied to the hopper tank 80 together with the nitrogen flow.

  (4) Shutter operation

  As described above, the shutter mechanism 201 takes in the resin pellets 54 from the hopper tank 62 to the drying treatment tank 60, and the shutter mechanism 202 opens and closes the resin pellets 54 from the drying treatment tank 60 to the storage tank 64.

  As shown in FIG. 7, when the switching valve 134 is switched, the air from the air source 136 is supplied to the air port 46 of the cylinder device 8, the piston 43 is pressurized and the piston shaft 44 is pushed out. The closing plate 36 matches the opening 22 and closes the opening 22. In this state, when the vacuum pump 94 is operated and the drying treatment tank 60 is in a reduced pressure state, the closing plate 36 on the shutter mechanism 201 side is attracted and brought into close contact with the lower plate 12 side, and the closing plate 36 on the shutter mechanism 202 side is It is attracted and adhered to the upper plate 10 side. The closed state of the shutter mechanism 202 is the state shown in FIG.

  After the drying tank 60 is returned to the atmospheric pressure, as shown in FIG. 11A, the switching valve 134 is switched to supply air from the air source 136 to the air port 48 of the cylinder device 8, and the piston 43 is When the piston shaft 44 is moved backward by pressurization, the closing plate 36 is detached from the opening 22 by the movement of the slider 6, and the opening 34 of the slider 6 is matched with the opening 22 as shown in FIG. Part 22 is opened. In this state, the resin pellet 54 can be taken in or taken out. Such an operation is the same for the shutter mechanism 202.

  Since such shutter mechanisms 201 and 202 are made of a rigid material such as a stainless steel plate or a hardened steel plate, there is almost no wear, and there is no deterioration in airtightness or change over time due to wear of the O-ring, and high reliability. Airtightness is maintained.

(5) Shutter-related operation As shown in FIG. 12A, in the shutter mechanism 201, when the switching valve 134 is switched and air is supplied to the air port 48 from the air source 136, the air in the cylinder device 8 is changed to the air port 46. From the air pipe 138 to the air port 29 and deposits such as chips between the upper plate 10 and the lower plate 12 can be discharged. Such an operation is similar in the shutter mechanism 202.

  As shown in FIG. 12B, in the shutter mechanism 201, when the switching valve 134 is switched and air is supplied from the air source 136 to the air port 46, the air in the cylinder device 8 passes through the air pipe 140 from the air port 48. The deposits such as chips flowing in the mouth 39 and between the upper plate 10 and the lower plate 12 can be similarly discharged. Such an operation is similar in the shutter mechanism 202.

  In FIG. 12A, the arrow indicates the air flow when the shutter mechanism 201 is switched from the closed state to the open state, and in FIG. 12B, the arrow indicates the case where the shutter mechanism 201 is switched from the open state to the closed state. Shows the air flow. Such an air flow is the same when the shutter mechanism 202 is opened and closed, and the space is obtained by combining the corners of the wall surfaces of the opening 34 and the opening 22 of the slider 6 that moves parallel to the opening 22. The resin pellets 54 deposited on the section 27 are sheared and removed to the filter 142 side by the air flow, and the shutter mechanisms 201 and 202 are opened and closed in a clean state, so that the airtightness of the drying treatment tank 60 can be maintained at a high level.

[Third Embodiment]

  Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a view showing a slider in the shutter mechanism, and FIG. 14 is a view showing a shearing state of resin pellets due to the movement of the slider.

  In the above embodiment, the opening 34 formed in the slider 6 is a circular hole. However, the opening 34 may be different from the opening 22 on the shutter frame 4 side. That is, as shown in FIG. 13, a V-shaped wall surface portion is formed in the opening portion 34 by a curved wall surface portion 342 coinciding with the opening portion 22 and two flat wall surface portions 344 and 346 toward the opening portion 32. Also good. In FIG. 13, the same parts as those in FIGS.

  With such a configuration, as shown in FIG. 14A, in the first embodiment, the circular openings 22 and 34 mesh with each other to shear the resin pellet 54. As shown in FIG. 14B, the meshing portion is sharpened by the meshing between the opening 22 and the flat wall surface portions 344 and 346 forming the V shape, so that the shearing ability with respect to the resin pellet 54 accompanying the movement of the slider 6 is increased. Enhanced. 14A and 14B, D1 and D2 indicate the widths of the meshing portions when the opening 32 of the slider 6 is moved to the same position with respect to the opening 22, and the meshing width D1. And the engagement width D2 clearly show that both satisfy D2 <D1, and in this way, it is understood that the shear function of the resin pellet 54 is enhanced in the slider 6 shown in FIG.

[Fourth Embodiment]

  Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 15 is a diagram illustrating a slider in the shutter mechanism.

  In the third embodiment, the V-shaped wall surface portion is formed with the two flat wall surface portions 344 and 346 in the opening portion 34, but as shown in FIG. 15, a curved wall surface portion 342 that coincides with the opening portion 22, A single flat wall surface portion 348 toward the opening 32 may be formed. Such a configuration also enhances the shearing function of the resin pellet 54.

[Fifth Embodiment]

  Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 16 is a diagram illustrating a shutter mechanism.

  In the above embodiment, the cylinder device 8 is used as an actuator. However, an actuator that uses electromagnetic force or hydraulic pressure as a drive source can be used as the actuator 800 for opening and closing the shutter mechanism 2, and positioning of the slider 6 can be performed. In addition, it can be positioned at the optimum position using an encoder or the like that detects the movement position, and is not limited to the mechanical positioning of the piston 43 of the cylinder device 8.

  In addition, the first to fifth embodiments described above can be described as follows, in addition to modifications, characteristics and advantages.

  (1) Since the shutter mechanisms 2, 201, and 202 are metal seals, an O-ring is unnecessary and seal packing parts are unnecessary. By using a metal seal, it is possible to prevent chips and the like from flowing out from a portion other than the path through which the resin pellet 54 passes, and to improve the surface accuracy of the slider 6, the upper plate 10, the lower plate 12 or the closing plate 36, quenching or coating, etc. Thus, metal wear of the shutter mechanisms 2, 201, 202 can be prevented, and generation of metal powder can also be suppressed.

  (2) In the shutter mechanisms 2, 201 and 202, when the resin pellet 54 is bitten, the resin pellet 54 can be cut, so that the shutter structure can be simplified. Moreover, since it is a metal seal, the slider 6, the upper plate 10, the lower plate 12 and the closing plate 36 constitute a shearing mechanism, and the sandwiched resin pellets 54 can be cut, and the materials such as quenching and coating described above Combined with the hardness, the shearing property can be enhanced.

  (3) Since the closing plate 36 is slightly thinner than the distance between the upper plate 10 and the lower plate 12 and slightly smaller than the opening 32, it can be freely moved by opening and closing, and can be opened and closed with high reliability.

  (4) Since the upper shutter mechanism 201 is opened and closed without the resin pellet 54, the resin pellet 54 is not bitten, and it is not always necessary to use a rigid material obtained by quenching and coating the lower plate 12 and the slider 6. . However, since the shutter mechanism 202 at the outlet of the drying treatment tank 60 is closed when the dried resin pellet 54 is flowing, it is expected that the resin pellet 54 will be sandwiched. Therefore, the sandwiched resin pellets 54 can be easily sheared by subjecting the lower plate 12 of the shutter mechanism 202, the slider 6 and the like to a surface treatment for imparting hardness by baking or coating.

  (5) The closing plate 36 that functions as a lid at the time of vacuum sealing is subjected to a quenching treatment, and the difference in hardness from the upper plate 10 or the lower plate 12 that slides at the time of opening and closing is set. The wear of 36 can be prevented, and the vacuum sealability can be improved and maintained. In addition, such a configuration can prevent galling due to contact of the metal surface and prevent generation of metal powder.

  (6) In the shutter mechanisms 201 and 202, if the bolt 24 that fixes the end plate 18 is removed, the slider 6 can be pulled out from the shutter frame 4, and maintenance and cleaning are easy.

  (7) Although the limit switch is used for monitoring the open / closed state, detection means such as an encoder may be used.

As described above, the most preferred embodiment and experimental results of the present invention have been described, but the present invention is not limited to the above-described embodiments and experimental results.

According to the present invention, a shutter mechanism used in a molding resin material drying apparatus or the like is useful because it does not wear an O-ring or the like, maintains airtightness, and realizes a reliable opening / closing operation.

It is a disassembled perspective view which shows the shutter mechanism which concerns on 1st Embodiment. It is an expansion perspective view which shows a closing plate. It is sectional drawing which shows a shutter frame, a slider, and a closing plate. It is a longitudinal cross-sectional view which shows a shutter mechanism. It is sectional drawing which shows operation | movement of a shutter mechanism. It is a figure which shows the structural example of the resin dryer which concerns on 2nd Embodiment. It is sectional drawing which shows a 1st shutter mechanism. It is sectional drawing which shows a 2nd shutter mechanism. It is a block diagram which shows a control apparatus. It is a flowchart which shows operation | movement of a resin drying apparatus. It is a figure which shows shutter operation | movement. It is a figure which shows shutter operation | movement. It is a figure which shows the slider which concerns on 3rd Embodiment. It is a figure which shows the movement of a slider. It is a figure which shows the slider which concerns on 4th Embodiment. It is a figure which shows the shutter mechanism which concerns on 5th Embodiment. ]

Explanation of symbols

2 Shutter mechanism 4 Shutter frame 6 Slider (moving plate)
8 Cylinder device 22 1st opening part 32 2nd opening part 34 3rd opening part 36 Closing plate 50 Resin dryer 60 Drying process tank 136 Air source

Claims (14)

A frame comprising a first opening;
A moving plate having a second opening larger than the first opening and moving in parallel with the first opening of the frame;
When the second opening is made to correspond to the first opening at the opening of the moving plate so as to be movable in the direction crossing the moving direction of the moving plate, the first of the frame A closing plate for closing the opening;
A shutter mechanism comprising: The shutter mechanism of claim 1,
A shutter mechanism, comprising: a drive unit that moves the moving plate in parallel with the frame and associates the closing plate with the first opening. The shutter mechanism of claim 1,
The shutter mechanism is characterized in that the closing plate is sized to close the first opening of the frame. The shutter mechanism of claim 1,
The shutter mechanism is characterized in that a peripheral wall surface is an inclined surface. The shutter mechanism of claim 1,
The shutter mechanism is characterized in that the moving plate includes a third opening corresponding to the first opening of the frame. A resin dryer for drying a molding resin material,
A drying tank for drying the molding resin material;
A frame provided with a first opening, which is installed at an inlet or an outlet of the molding resin material of the drying tank;
A moving plate having a second opening larger than the first opening and moving in parallel with the first opening of the frame;
When the second opening is made to correspond to the first opening at the opening of the moving plate so as to be movable in the direction crossing the moving direction of the moving plate, the first of the frame A closing plate for closing the opening;
A resin dryer comprising: In the resin dryer of Claim 6,
A decompression means for decompressing the drying tank is provided, and the first opening of the frame is closed by the closing plate by sucking the closing plate by the decompression of the drying tank by the decompression means. Resin dryer. In the resin dryer of Claim 6,
A resin dryer, comprising: a drive unit that moves the moving plate in parallel with the frame and associates the closing plate with the first opening. In the resin dryer of Claim 6,
The resin dryer according to claim 1, wherein the closing plate is sized to close the first opening of the frame. In the resin dryer of Claim 6,
A resin dryer, wherein the closing plate has an inclined peripheral wall surface. In the resin dryer of Claim 6,
When the moving plate is provided with a third opening, and the moving plate is moved, the molding resin material in the first opening of the frame is transferred to the third opening and the first opening. Resin dryer characterized by shearing between the opening edges of the part. In the resin dryer of Claim 6,
The frame is installed with the moving plate in between, and includes an air port communicating with the third opening of the moving plate. The resin dryer according to claim 12,
A resin dryer comprising an air source that supplies cleaning air to the air opening when the first opening is closed by the closing plate. The resin dryer according to claim 11,
The resin dryer according to claim 3, wherein the third opening formed in the moving plate includes a flat wall surface that intersects with the wall surface of the first opening by the movement of the moving plate.

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