JP2010042651A - Shutter device of airtight structure, and its operation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shutter device of airtight structure which solves the problem that a sealing member is worn and cannot perform appropriate sealing in a conventional shutter device of airtight structure. <P>SOLUTION: The shutter device 26 of airtight structure or the like which is provided with a shutter member 42 for opening and closing openings 24a, 41a, 47a, is provided with: an intermediate member 47 provided between a body member 41 and the shutter member 42; the shutter member 42 abutting on the intermediate member 47 so as to be freely slidable; and pressing means 49, 50, 51 provided between the intermediate member 47 and the body member 41 and pressing the intermediate member 47 toward the shutter member 42. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a shutter device of an airtight structure provided with a shutter member that opens and closes an opening, and an operation method thereof.

As a shutter device of an airtight structure provided with a shutter member that opens and closes an opening, those disclosed in Patent Documents 1 to 3 are known. Patent Document 1 uses a rotary valve type shutter device as a supply part of an injection device of an injection molding machine. In addition to the large size of the device, high processing accuracy is required for the housing and the rotary valve body. Actually, there were many problems in terms of sealing performance and galling. Further, Patent Document 2 uses a shutter device that rotates in the horizontal direction for a supply part of an injection device of an injection molding machine. As shown in FIG. 4, a seal is provided between a through hole 5 d and a shutter member 3. For this purpose, an O-ring 4A is provided. However, Patent Document 2 has a problem that when the shutter member 3 is rotated, the O-ring 4A wears because the shutter member 3 slides between the O-ring 4A. Further, if the pressing force of the shutter member 3 by the O-ring 4A is weakened to prevent the O-ring 4A from being worn, the resin powder adhering to the upper surface of the shutter member 3 is moved when the shutter member 3 is rotated. 3 and the through-hole 5d, there is a problem that the sealing performance by the O-ring 4A is hindered. Therefore, in order to ensure the sealing performance by the O-ring 4A, there is a problem whether the surface pressure between the O-ring 4A and the shutter member 3 is high or low. In Patent Document 3, the shutter 3 is brought into contact with the seal member to maintain airtightness. However, there is a problem similar to that of the Patent Document 2, and the wear of the seal member 16a during the movement of the shutter 3 is avoided. It was not possible.

JP-A-9-164527 (Claim 2, 0007, FIG. 1) JP 2001-293750 A (Claim 2, 0021, FIG. 1) JP 2002-347073 A (Claim 1, 0019, FIG. 1)

In view of the above problems, the present invention provides a shutter device for an airtight structure that solves the problem that a conventional sealing device for an airtight structure cannot be properly sealed due to wear of the seal member. Objective.

An airtight structure shutter device according to the present invention is an airtight structure shutter device provided with a shutter member that opens and closes an opening, and an intermediate member provided between the main body member and the shutter member, and the intermediate member A shutter member that is slidably contacted, and a pressing unit that is provided between the intermediate member and the main body member and presses the intermediate member toward the shutter member.

An airtight structure shutter device according to the present invention includes an intermediate member provided between a main body member and a shutter member, a shutter member slidably contacted with the intermediate member, and the intermediate member and the main body portion. And a pressing means for pressing the intermediate member toward the shutter member. Therefore, the seal of the shutter device can be kept good.

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view of an injection device to which the shutter device of the present embodiment is attached. FIG. 2 is a cross-sectional view of the shutter device of the present embodiment. FIG. 3 is a horizontal sectional view taken along line AA in FIG.

The injection device 11 of the injection molding machine supplies the molding material M input from the material input device 12 to the material supply device 13 to the heating cylinder 15 via the material adjustment device 14, and is inserted into the heating cylinder 15. Is rotated by a screw rotating motor 17 to be plasticized and become a molten material, which is stored inside the front end side of the heating cylinder 15 in front of the screw 16. The stored molten material is injected into a cavity of a molding die attached to a mold clamping device (not shown) by moving the screw 16 forward by driving a screw forward / backward moving means (not shown) to form a molded product. The

The material supply device 13 supplies a predetermined amount of the molding material M to the material adjustment device 14 while keeping the inside of the material adjustment device 14 and the inside of the heating cylinder 15 in a vacuum structure. The outer shell of the material supply device 13 forms an airtight structure together with the outer shell of the material adjusting device 14 and the outer shell of the heating cylinder 15, and is formed from the material charging device 12 to the material adjusting device 14 inside. A passage for material M is formed. The material supply device 13 includes an upper cylindrical body 18, an intermediate cylindrical body 19, and a lower cylindrical body 20 made of glass. The amount of the molding material M inside is visible, and is detected by level sensors 21 and 22. It is possible. An upper shutter device 25 is provided between the upper cylinder 18 and the intermediate cylinder 19 via metal ring bodies 23 and 23 which are part of the main body member. A lower shutter device 26 is also provided between the intermediate cylinder 19 and the lower cylinder 20 via metal ring bodies 24 and 24 that are part of the main body member. The members of the airtight structure including the material supply device 13, the material adjustment device 14, and the heating cylinder 15 are sealed with an O-ring or the like.

A hole 27 is formed in the ring body 24 between the shutter device 26 and the lower cylindrical body 20, and the pipe line 28 connected to the hole 27 is vacuumed from the hole 29 of the material adjusting device 14 through the filter 30. A pipe line 32 connected to the source 31 is connected. Further, a hole 33 is formed in the ring body 23 between the intermediate cylinder 19 and the shutter device 25, and an open / close valve 35 is provided in a pipe line 34 connected to the hole 33, and the pipe line 34 is a pipe line. 32. The material supply device 13 uses the two shutter devices 25 and 26. However, when the molding material M is supplied to the heating cylinder 15, there is only one shutter device in which the inside of the heating cylinder 15 is at atmospheric pressure. It may not be.

The material adjusting device 14 controls the rotation speed of the motor 37 that is a driving means of the feed screw 36, and conveys the molding material M so that the amount of the molding material M in the screw 16 groove in the heating cylinder 15 is optimized. Adjust the amount. The material adjusting device 14 is not essential, and the material supplying device 13 may be directly attached to the heating cylinder 15.

Next, the structure of the shutter devices 25 and 26 of the material supply device will be described with reference to FIGS. Since the upper shutter device 25 and the lower shutter device 26 have substantially the same structure, the state where the lower shutter device 26 is opened will be described.

The shutter device 26 is provided with a main body member 41 formed of a rectangular parallelepiped as an outer shell, and a shutter member 42 is accommodated in the main body member 41. The upper surface of the upper plate of the main body member 41 is fixed with the ring body 24 and the O-ring interposed therebetween, and the lower surface of the lower plate of the main body member 41 is fixed with the ring body 24 and the O-ring interposed therebetween. An opening 41 a having the same diameter as the opening 24 a of the ring body 24 is formed in the upper plate and the lower plate of the main body member 41. An air cylinder 43 is fixed to one end of the main body member 41 to move the shutter member 42 of the shutter device 26 back and forth in the horizontal direction. As shown in FIG. 1, the air cylinder 43 is connected to an air pressure source 45 via an on-off valve 44. In addition to the on-off valve 44 and the air pressure source 45, the level sensors 21 and 22, the vacuum source 31, the motors 17 and 37, etc. are connected to the control device 46, respectively.

The rod 43 a of the air cylinder 43 is fixed to the shutter member 42. The shutter member 42 is a rectangular metal flat plate having a predetermined plate thickness that has been surface-treated by chromium nitride coating. As shown in FIG. 3, the width of the shutter member 42 coincides with the width of the inside of the hollow main body member 41, and both side surfaces of the shutter member 42 are slidable on the inner surface in the longitudinal direction of the main body member 41. It has become. At the center near the front of the shutter member 42, an opening 24a of the ring body 24 and a through hole 42a having the same diameter as the opening 41a of the main body member 41 are formed. Then, when the opening 41a and the like and the position of the through hole 42a of the shutter member 42 are partially overlapped, the molding material M falls downward, and the position of the opening 41a and the through hole 42a does not overlap at all. Sometimes, the shutter device 26 can be sealed.

Further, between the main body member 41 and the shutter member 42, an intermediate member 47 in which an opening 47 a having the same diameter as the opening 41 a of the main body member 41 and the through hole 42 a of the shutter member 42 is provided. A recess 41b is formed in the periphery of the opening 41a on the inner (shutter side) surface of the main body member 41. An intermediate member 47 is attached to the recess 41b. However, since the plate thickness of the intermediate member 47 is thicker than the depth of the concave portion 41b in the vertical direction, the surface 47b (plane) on the shutter member side of the intermediate member 47 is inward of the surface 41c of the main body member 41. Protrusively toward. The intermediate member 47 is attached to the upper and lower plates of the main body member 41, respectively. The distance between the surface 47b of the intermediate member 47 and the upper and lower surfaces 42b (planes) of the shutter member 42 can be brought into close contact by surface contact to such an extent that leakage exceeding an allowable limit does not occur. The interval is slidable when moving.

The intermediate member 47 is formed of a metal material that is less likely to cause galling with the metal material of the shutter member 42 or the surface treatment material of the shutter member 42, or is subjected to a surface treatment. The shutter member 42 and the intermediate member 47 may be formed of a material such as a resin other than a metal material. However, in the present invention, the intermediate member 47 is made of a material whose shape is not changed, and a material whose shape is changed by wear such as rubber is excluded. Further, it is desirable that the surface 47b of the intermediate member 47 has a low coefficient of friction when sliding with the surface of the shutter member 42 and has good adhesion. Accordingly, the surface 47b of the intermediate member 47 is desirably a smooth flat surface, but may be a loose curved surface or the like. Further, the surface 47b of the intermediate member 47 has a predetermined area to ensure adhesion with the surface 42b of the shutter member 42, and in the case of a donut shape, it is 5 mm or more, more preferably 10 mm or more in the radial direction. It is desirable to have a width of

A pressing means 49 is provided between the main body member 41 and the intermediate member 47 to press the surface 47 b of the intermediate member 47 toward the surface 42 b of the shutter member 42. Specifically, a concave groove 48 is formed on the surface 47c of the intermediate member 47 on the body member side (the upper surface of the upper intermediate member 47 and the lower surface of the lower intermediate member). Inside the concave groove 48, a spring 50 is inserted on the back side, and an O-ring 51 made of rubber is inserted as a sealing member on the surface side. A wave spring is used as the spring 50. However, the spring 50 is not essential, and only the O-ring 51 may be inserted into the concave groove 48 as a pressing means. Furthermore, a concave groove may be formed on the surface of the concave portion 41 b of the main body member 41, and a pressing means 49 composed of at least one of the spring 50 or the O-ring 51 may be provided. The number of pressing means 49 is not limited to one (one round). Alternatively, separately from the pressing means, only a sealing member made of an O-ring or the like may be provided by forming a concave groove in the outer peripheral surface 47d of the intermediate member 47.

On the inner upper surface of the lower plate of the main body member 41, a flat mounting plate 52 made of resin having a low friction coefficient and having a predetermined plate thickness is attached. The upper surface of the mounting plate 52 is slidable with the lower surface of the shutter member 42. The reason why the mounting plate 52 is provided is that if the surface 42b of the shutter member 42 is not held at a portion other than the portion that slides on the surface 47b of the intermediate member 47, the shutter member 42 is not stable during movement, and the shutter is also stopped when stopped. The weight of the member 42 is excessively applied to the lower pressing means 49 via the lower intermediate member 47, and the surfaces 42 b and 42 b of the shutter member 42 and the surfaces 47 b and 47 b of the intermediate members 47 and 47 on the upper and lower sides of the shutter member 42. There was a problem that the gap was not uniform. However, by placing the shutter member 42 slidably on the mounting plate 52, it is possible to maintain a substantially uniform gap with respect to the upper and lower intermediate members 47, 47.

Next, the operation of the material supply device 13 and the shutter devices 25 and 26 will be described. The state shown in FIG. 1 is a state in which the shutter device 25 at the top of the material supply device 13 is opened and the molding material M is dropped into the intermediate chamber 53 formed from the intermediate cylinder 19 and the like. At this time, the shutter device 26 below the material supply device 13 is closed. And the airtight structure comprised from the heating cylinder 15, the material adjustment apparatus 14, the lower cylinder 20, etc. is always attracted | sucked by the vacuum source 31 via the pipe line 32 grade | etc.,. Next, the upper shutter device 25 is closed. The shutter device 25 is closed by operating the air cylinder 43 so that the shutter member 42 is advanced to the position indicated by the alternate long and short dash line in FIG. 3, and at the same time, the through hole 42a of the shutter member 42 coincides with the openings 24a, 41a, 47a. Is moved forward, and the openings 24a, 41a, 47a are closed by a plate portion closer to the rear of the shutter member 42. At this time, the surfaces 42b and 42b of the shutter member 42 are supported by a part of the weight by the mounting plate 52 and are moved so as to be in contact with the surfaces 47b and 47b of the upper and lower intermediate members 47 and 47. Very unlikely to occur. Further, since the shutter member 42 and the intermediate member 47 are in a sliding state by appropriate pressure, the powder contained in the molding material M is not caught.

Next, the on-off valve 35 is opened, the air in the intermediate chamber 53 is sucked, and the intermediate chamber 53 is evacuated. At that time, since the upper shutter device 25 is closed, a portion below the middle cylindrical body 19 (intermediate chamber 53) is an airtight structure. When the molding material M is supplied from the material adjusting device 14 to the heating cylinder 15 together with the continuous molding and the molding material M in the lower cylinder 20 decreases, and the level sensor 22 becomes unable to detect the molding material M, the lower shutter device. 26 is opened, and the molding material M in the intermediate chamber 53 is dropped into the material adjusting device 14 and the lower cylindrical body 20. The timing for opening the lower shutter device 26 may be set by a timer. Further, the next molding material M is supplied to the upper cylindrical body 18 above the upper shutter device 25 that is closed from the material charging device 12 during the operation, and supplied when the level sensor 21 senses the molding material M. Is stopped. When the lower shutter device 26 is closed again and the hermetic structure below the shutter device 26 is vacuumed, the upper shutter device 25 is then opened, and the molding material M for the upper cylinder 18 is opened. Is dropped into the intermediate chamber 53. As a result, the state of FIG. 1 is obtained again, and the same cycle is repeated.

Next, a shutter device 61 according to another embodiment will be described with reference to FIGS. 4 and 5, focusing on differences from the embodiment of FIGS. 1 to 3. The upper plate and the lower plate of the main body member 62 of the shutter device 61 are formed with a hole 62 a having a diameter larger than that of the opening of the ring body (not shown) and the through hole 63 a of the shutter member 63. The hole 62a of the main body member 62 has an opening 64a (inner diameter) having the same diameter as the opening of the ring body and the through hole 63a of the shutter member 63, and can be fitted into the hole 62a of the main body member 62. An intermediate member 64 having a small diameter portion 64d (outer diameter) is inserted from the inside. The upper surface of the main body member 62 and the upper surface of the intermediate member 64 have the same height. A flange portion 64c having a diameter larger than that of the small diameter portion 64d is formed on the outer periphery of the intermediate member 64. The flange portion 64c can be fitted into a recess 62b provided on the inside of the upper plate or the like of the main body member 62 and around the hole 62a. The plate thickness of the flange portion 64c is thicker than the depth of the concave portion 62b, and the surface 64b of the intermediate member 64 that contacts the shutter member 63 protrudes from the inner surface 62c of the main body member 62. It comes to be a position.

A concave groove 64e is formed in the small diameter portion 64d of the intermediate member 64, and an O-ring 65 as a seal member is inserted. The position of the seal member may be on the main body member 62 side and is not limited. In addition to the seal member, a pressing unit that presses the intermediate member 64 toward the shutter member 63 is provided between the intermediate member 64 and the main body member 62. As the pressing means, a spring 66 as a resilient member is inserted. In this embodiment, the spring 66 is a wave spring, but the type is not limited. However, the pressing force by the spring 66 is adjusted to such an extent that the surface 64b of the intermediate member 64 can contact the surface 63b of the shutter member 63 with a good surface pressure that does not cause galling. An intermediate member 64 having the same structure, an O-ring 65 serving as a seal member, and a spring 66 serving as a pressing means are also attached to the lower surface side of the main body member 62, but the description thereof is omitted. The shutter member 63 is brought into contact with both intermediate members 64 and 64 so as to have substantially the same surface pressure. FIG. 5 is a view when the shutter device 61 is closed. As the shutter member 63 advances, the through hole 63a advances and the opening 64a is closed by the plate portion of the shutter member 63.

According to the present embodiment, since the O-ring 65 that is a sealing member only performs sealing, the surface pressure when the intermediate member 64 is pressed against the shutter member 63 does not change depending on the hardness and diameter of the O-ring 65, and the pressing is performed. It can be pressed with a surface pressure controlled by a spring 66 as a means. In the present embodiment, the gap between the intermediate member 64 and the shutter member 63 can be appropriately maintained even when the self-weight of the shutter member 63 is heavy particularly in the large shutter device 61.

Next, a shutter device of still another embodiment will be described with reference to FIGS. 6 to 8 focusing on differences from the other embodiments of FIGS. The shutter device 71 of another embodiment of FIGS. 6 to 8 is substantially the same as the other embodiments of FIGS. 4 and 5 in the shapes of the main body member 72, the shutter member 73, and the intermediate member 74. However, the difference is that the pressing means for pressing the intermediate member 74 toward the shutter member 73 uses a fluid pressure such as air pressure (or oil pressure), not a spring as a resilient member. Specifically, an air chamber 75 is formed between the concave portion 72 c of the main body member 72 and the flat surface 74 e of the flange portion 74 c of the intermediate member 74, and the air chamber 75 is not shown through the hole 72 d of the main body member 72. Connected to external pipelines, on-off valves, and pneumatic sources. A concave groove is formed in each of the small-diameter portion 74d of the intermediate member 74 and the outer peripheral surface 74f of the flange portion 74c, and O-rings 76, 76 as seal members are inserted into the concave grooves. This also prevents air from leaking from the air chamber 75.

As shown in FIG. 7, when opening and closing the shutter member 73, the air pressure in the upper and lower air chambers 75, 75 is similarly lowered so that the surface 74 b of the intermediate member 74 and the surface 73 b of the shutter member 73 slide. Reduce resistance and prevent galling. Further, when the shutter device 71 is kept closed as shown in FIG. 8, the air pressure of the air chamber 75 is increased, the contact force between the surface 74b of the intermediate member 74 and the surface 73b of the shutter member 73 is enhanced, and the airtightness is increased. Prevent leakage from the internal space of the structure.

Next, a shutter device 81 according to a fourth embodiment shown in FIG. 9 will be described. In the shutter device 81 of the fourth embodiment, the case plate 83 of the main body member 82, the air cylinder 84, and the shutter member 85 have substantially the same form as the embodiment shown in FIG. The thickness is increased. A shutter member 85 is attached to the rod of the air cylinder 84 in the case surrounded by the case plate 83, and the shutter member 85 is slidably mounted on the mounting plate 86. The main body member 82 includes upper and lower metal ring bodies 88, 88. One surface of the ring body 88 is fixed to a cylindrical body 87 made of glass, and the other surface is fixed to a case plate 83. ing.

Next, the structure of the pressing means composed of the case plate 83, the ring body 88, the intermediate member 89, and the like provided respectively above and below the shutter member 85 will be described in detail with respect to what is disposed above the shutter member 85. At a position facing the ring body 88 of the case plate 83 of the main body member 82, a large diameter hole 83b having a diameter smaller than the diameter of the ring body 88, and a small diameter hole 83c having a diameter smaller than that of the large diameter hole 83b, A through hole 83a is formed. Between the ring body 88 of the main body member 82 and the shutter member 85, an opening 89a through which the molding material M having the same diameter as the opening 88a of the ring body 88 and the through hole 85a of the shutter member 85 passes is formed. An intermediate member 89 is provided. An intermediate member 89 is inserted into the through hole 83 a of the case plate 83. The intermediate member 89 is provided on one surface with a flat surface 89b that contacts the surface 85b of the shutter member 85, and on the other surface on the opposite side, a facing surface 89c is provided in parallel with the contact surface 89b. It is a cylindrical member provided with an opening 89a having a circular cross section on the circumferential side. On the outer peripheral side of the intermediate member 89, small-diameter portions 91 and 91 corresponding to rods are formed at the same diameter on both sides with a flange portion 90 corresponding to a piston as a boundary. The flange portion 90 of the intermediate member 89 has a diameter that is slidably inserted into the large diameter hole 83b of the through hole 83a, and the small diameter portion 91 is slidably inserted into the small diameter hole 83c of the through hole 83a. It has a diameter. The diameters of the small diameter portions 91 and 91 provided above and below the intermediate member 89 are such that one of the diameter ratios of the abutting surface 89b and the facing surface 89c is within 1.25 times the other. It is desirable to be provided.

As for the intermediate member 89, when the intermediate member 89 is inserted from above the case plate 83 and the shutter member 85, the opposing surface 89 c is the case plate 83 when the contact surface 89 b contacts the upper surface of the shutter member 85. It is designed to be the same height as the upper surface 83d. A ring-shaped protrusion 88b is formed on the side of the ring body 88, which is a part of the main body member 82, on the side attached to the upper surface 83d of the case plate 83. The protrusion 88b has a diameter that is slidably inserted into the outer periphery of the small-diameter portion 91 of the intermediate member 89 and an outer side that is slidably inserted into the large-diameter hole 83b of the through hole 83a of the case plate 83. Ring-shaped protrusions having a certain diameter, formed at a constant height (about 1 mm to 5 mm), and fitted into the large-diameter hole 83b of the through-hole 83a of the case plate 83 without a gap. On one surface side (upper surface side) of the flange portion 90 of the intermediate member 89, a pressing surface 90a that is an upper surface of the flange portion 90 provided separately from the facing surface 89c, and a lower surface of the protruding portion 88b of the ring body 88 are provided. The first air chamber 92 is formed so as to be surrounded by the inner peripheral surface of the large-diameter hole 83b of the through-hole 83a and the outer peripheral surface of the small-diameter portion 90 of the intermediate member 89.

The first air chamber 92 is connected to a conduit 95 to an air supply source via a communication passage 93 formed in the case plate 83. The communication passage 93 may be provided through the ring body 88. Further, on the other surface side (lower surface side) of the flange portion 90 of the intermediate member 89, the lower surface of the flange portion 90, the bottom surface of the large diameter hole 83b of the through hole 83a, the inner peripheral surface of the large diameter hole 83b, and the intermediate member 89 are provided. A second air chamber 94 is formed so as to be surrounded by the outer peripheral surface of the small diameter portion 91. Therefore, in other words, the structure constitutes an air cylinder as pressing means in which the main body member 82 such as the ring body 88 and the case plate 83 corresponds to a cylinder cylinder, and the intermediate member 89 corresponds to a piston and a rod. In the fourth embodiment shown in FIG. 9, no communication passage is formed in the second air chamber 94.

The pipe 95 is provided with a regulator 96 and a switching valve 97 for controlling the air pressure to atmospheric pressure or higher, a pump 98 or a fan which is an air pressure supply device, a filter (not shown), and the like. The regulator 96, which is a low-pressure precision control type, is attached with a regulator capable of setting low-pressure air within a range of 0.2 MPa to 0.01 MPa (atmospheric pressure + 0.2 MPa to 0.01 MPa). The surface 89b of the intermediate member 89 that contacts the shutter member 85 is pressed toward the surface of the shutter member 85 by pressing a pressing surface 90a provided separately from the facing surface 89c. is there. Therefore, the frictional resistance between the shutter member 85 and the intermediate member 89 can be set to an optimum value.

In the present invention, seal members made of O-rings or the like are inserted at the following locations. An O-ring 99 is provided on the ring body 88 side between the cylindrical body 87 and the ring body 88, and an O-ring 100 is provided on the surface side of the case plate 83 between the ring body 88 and the case plate 83. An O-ring 101 is provided on the intermediate member 89 side between the small-diameter portion 91 outside 89 and the protrusion 88 b of the ring body 88, and between the flange portion 90 of the intermediate member 89 and the large-diameter hole 83 b of the case plate 83. On the side of the intermediate member 89, an O-ring 102 is provided so as to protrude from the surface in a groove formed respectively. Further, in the present embodiment, the case surrounded by the case plate 83 is not strictly sealed, and the inside of the case is copied to normal pressure even in an arithmetic expression described later.

Accordingly, it should be particularly noted in the context of claim 6 that the gap between the surface of the ring body 88 on the opening 89a side of the O-ring 101 and the facing surface 89c of the intermediate member 89 has the same atmospheric pressure as in the opening 89a. It is a point that is communicated with. In the present embodiment, the O-ring 101 is provided on the outer peripheral surface of the small-diameter portion 91, and one and the other small-diameter portions 91 have the same diameter, so the surface 89b that contacts the shutter member 85 and the opposing surface 89c in the intermediate member 89 The areas of the parts communicated at the same atmospheric pressure are the same. However, the diameters of the small-diameter portions 91 and 91 may be respectively changed so that one of the areas of the abutting surface 89b and the facing surface 89c is different within 1.25 times the other. The position where the seal member such as an O-ring is provided may be on the facing surface 89c or the ring body 88 side. When the sealing member is provided on the surface of the facing surface 89c or the ring body 88, the area of the facing surface 89c on the inner side of the sealing member such as the O-ring 101 with respect to the area of the surface 89b in contact with the shutter member 85 is either You may make it differ in the range within 1.25 times of the other. The pressing means including the ring member 88 of the main body member 82 and the intermediate member 89 fitted into the case plate 83 below the shutter member 85 has the same basic structure although it is upside down. Description is omitted.

Next, the operation of the material supply device 13 and the shutter device 81 will be described. The shutter device 81 of the present embodiment is used as an upper shutter device and a lower shutter device, and in particular, a lower shutter device in which the inside of the intermediate cylinder 19 and the lower cylinder 20 is evacuated (the shutter device in FIG. 2). When used as 26), the effect is great. As in the case of the material supply device 13 shown in FIG. 1, the operation when the shutter device 81 is used for the material supply device 13 is as follows. (1) The upper shutter device 81 is opened and the molding inside the upper cylinder 18 is performed. The material M is dropped into the intermediate chamber 53 in the intermediate cylinder 19 (At this time, the shutter device 81 is opened in the state of both the upper cylinder 18 and the intermediate cylinder 19 at the atmospheric pressure, The shutter device 81 is closed.) (2) The upper shutter device 81 is closed. (3) The inside of the intermediate cylindrical body 19 to which the molding material M is supplied is vacuumed to be in a vacuum state. (4) The lower shutter device 81 is opened, and the molding material M in the intermediate cylinder 19 in the vacuum state is dropped into the lower cylinder 20 in the same vacuum state. (5) The lower shutter device 81 is closed. (6) The inside of the intermediate cylinder 19 is broken down to the atmospheric pressure. Next, the upper shutter device 81 in (1) is opened again in this order.

In the present embodiment, when the shutter device 81 is attached as a lower shutter device, the upper part (inside the intermediate cylinder 19) of the shutter member 85 has atmospheric pressure, and the lower part (in the lower cylinder 20) is vacuum. In this case, the pressing force of the intermediate member 89 to the shutter member 85 may be made substantially equal in the case where the upper part (in the intermediate cylinder 19) and the lower part (in the lower cylinder 20) of the shutter device 81 are vacuum (−98 kPa). it can.

This point will be described in comparison with a shutter device 71 of still another embodiment shown in FIG. In the example of FIG. 6, the area of the surface facing the shutter member 73 of the intermediate member 74 is 0.0074 m ^{2 and} the area of the upper surface (or lower surface) facing the ring body is 0.0016 m ² and the area of the through hole. There is an area difference between 0.0030M ² between the area 0.0044M ² plus 0.0028m ^2, so that the area difference between the area of the plane 74e of the flange portion 74c of the intermediate member 74 (pressing surface) Yes. Therefore, considering the case where an atmospheric pressure +0.01 MPa is applied to the air chamber and the pressing force is applied to the shutter member 73 by the intermediate member 74, when the upper part is atmospheric pressure and the lower part is vacuum (3,330 Pa), Since the gap between the contact surfaces of the shutter member 73 and the intermediate member 74 and the gap between the intermediate member 74 and the ring body (not shown) are imitated as a space communicating with the atmospheric pressure, the following calculation formula 1 is established.

Total pressing force acting on the intermediate member toward the shutter member ... A
0.0030 m ² (effective area of the pressing surface of the air chamber) × (10,000 Pa (pressing force) +101,325 Pa (atmospheric pressure)) + 0.0016 m ² (area of the portion facing the ring body) × 101,325 Pa = 496N (rounded off)
Force acting on the intermediate member toward the ring body ... B
0.0046 m ² (contact area between shutter member and intermediate member) × 101,325 Pa (atmospheric pressure) = 466 N (rounded off to the nearest decimal point)
The pressing force that actually acts on the intermediate member toward the shutter member when the upper part is atmospheric pressure and the lower part is vacuum ... C = AB
496-466 = 30N
(Actually, the atmospheric pressure exerted on the surface of the intermediate member facing the ring body is canceled out.)

Next, when the pressure in the air chamber 75 is the same atmospheric pressure +0.01 MPa as described above, and the upper and lower parts are vacuum (3,330 Pa), the following calculation formula 2 is established.

Total pressing force acting on the intermediate member toward the shutter member ... D
0.0030 m ² (effective area of the pressure surface of the air chamber) × (10,000 Pa + 101,325 Pa) +0.0016 m ² (area of the part facing the ring body) × 3,330 Pa (vacuum pressure) = 339 N (rounded off to the nearest decimal place) )
Force acting on the intermediate member toward the ring body ... E
0.0046 m ² (contact area between shutter member and intermediate member) × 3,330 Pa (vacuum pressure) = 15 N (rounded to the nearest decimal place)
The pressing force that actually acts on the intermediate member toward the shutter member when the upper and lower portions are vacuum. F = DE
339-15 = 324N

Accordingly, in the embodiment shown in FIG. 6, the pressing force C actually acting on the intermediate member toward the shutter member when the upper part is atmospheric pressure and the lower part is vacuum, and the pressing force C actually acting on the shutter member when the upper and lower parts are vacuum In addition, there is a large difference in the pressing force with the pressing force F acting on the intermediate member.

Next, the shutter device 81 of the embodiment shown in FIG. 9 is similarly verified. In the example of FIG. 9, the area of the surface 89b where the intermediate member 89 abuts against the shutter member 85 and the area of the facing surface 89c where the intermediate member 89 faces the ring body 88 are both 0.0046 m ² and there is no area difference. The effective area of the pressing surface 90a of the first air chamber 92 is 0.0030 m ² as in the example of FIG. Therefore, in the case where the pressure of the atmospheric pressure +0.01 MPa is applied to the pressing surface 90a of the first air chamber 92 and the shutter member 85 is pressed by the intermediate member 89, the upper portion is at atmospheric pressure and the lower portion is vacuumed ( 3330 Pa), the gap between the contact surface 89b of the shutter member 85 and the intermediate member 89 and the gap between the intermediate member 89 and the ring body 88 are imitated as a space communicating with the atmospheric pressure. The following calculation formula 3 holds.

Total pressing force acting on the intermediate member toward the shutter member ... G
0.0030 m ² (effective area of the pressing surface of the air chamber) × (10,000 Pa (pressing force) +101,325 Pa (atmospheric pressure)) + 0.0046 m ² (area of the portion facing the ring body) × 101,325 Pa = 800N (rounded to the nearest decimal place)
Force acting on the intermediate member toward the ring body ... H
0.0046 m ² (contact area between shutter member and intermediate member) × 101,325 Pa (atmospheric pressure) = 466 N (rounded off to the nearest decimal point)
The pressing force actually acting on the intermediate member toward the shutter member when the upper part is atmospheric pressure and the lower part is vacuum ... I = GH
800-466 = 334N
(Accordingly, the atmospheric pressure exerted on the upper and lower surfaces of the intermediate member is actually canceled out.)

Next, when the pressure in the first air chamber 92 is the same atmospheric pressure + 0.01 MPa as described above, and the upper and lower parts are vacuum (3,330 Pa), the following calculation formula 4 holds.

Total pressing force acting on the intermediate member toward the shutter member ... J
0.0030 m ² (effective area of the pressure surface of the air chamber) × (10,000 Pa + 101,325 Pa) +0.0046 m ² (area of the part facing the ring body) × 3,330 Pa (vacuum pressure) = 349 N (rounded off to the nearest decimal place) )
Force acting on the intermediate member toward the ring body ... K
0.0046 m ² (contact area between shutter member and intermediate member) × 3,330 Pa (vacuum pressure) = 15 N (rounded to the nearest decimal place)
The pressing force that actually acts on the intermediate member toward the shutter member when the upper and lower portions are in vacuum ... L = JK
349-15 = 334N

Therefore, in the embodiment shown in FIG. 9, the pressing force I actually acts on the intermediate member toward the shutter member when the upper part is atmospheric pressure and the lower part is vacuum, and the pressing force I actually acts on the shutter member when the upper and lower parts are vacuum. In addition, with the pressing force L acting on the intermediate member, the pressing force is equal in calculation. Accordingly, by setting the set value of the regulator 96 optimally, it is possible to set the pressing force most suitable for sliding and sealing between the shutter member 85 and the intermediate member 89. The pressing force is similarly controlled on the upper and lower surfaces of the shutter member 85.

In addition, the shutter device 81 of the embodiment shown in FIG. 9 verifies in the same manner as described above when the contact surface 89b and the surface communicating with the same atmospheric pressure in the opening 88a of the facing surface 89c are different. When the area of the surface where the intermediate member 89 abuts against the shutter member 85 is 1.25 times the area of the facing surface 89c of the intermediate member 89, when the area of the abutting surface 89b is 0.0046 m ² , the facing surface The area of 89c is 0.00368 m ² . However, it is assumed that the O-ring 101 is on the outer peripheral surface of the small-diameter portion 91 and the entire facing surface 89c communicates with the inside of the opening 89a. Further, although there is no difference in the area of the abutting surface 89b and the facing surface 89c, an O-ring 101 is provided on the upper surface of the facing surface 89c, and communicates with the abutting surface 89b at the same pressure in the opening of the facing surface 89c. The same applies to the case where the area ratio of the surface (the surface inside the O-ring 101) is 1.25 times. Also in this case, it is assumed that a pressure of 0.01 MPa is applied to the pressing surface 90a of the first air chamber 92 in addition to the atmospheric pressure. Next, Formula 5 is shown.

Total pressing force acting on the intermediate member toward the shutter member ... M
0.0030 m ² (effective area of the pressing surface of the air chamber) × (10,000 Pa (pressing force) +101,325 Pa (atmospheric pressure)) + 0.00368 m ² (area of the portion facing the ring body) × 101,325 Pa = 707N (rounded to the nearest decimal place)
Force acting on intermediate member toward ring body ... N
0.0046 m ² (contact area between shutter member and intermediate member) × 101,325 Pa (atmospheric pressure) = 466 N (rounded off to the nearest decimal point)
The pressing force that actually acts on the intermediate member toward the shutter member when the upper part is atmospheric pressure and the lower part is vacuum ... O = MN
707-466 = 241N
(Accordingly, the atmospheric pressure extending to the upper and lower surfaces of the intermediate member is actually canceled out.)

Next, when the area ratio between the surfaces is 1.25 times, the pressure in the air chamber is the same atmospheric pressure +0.01 MPa as above, and the upper and lower parts are vacuum (3,330 Pa), Calculation formula 6 holds.

Total pressing force acting on the intermediate member toward the shutter member ... P
0.0030 m ² (effective area of the pressure surface of the air chamber) × (10,000 Pa + 101,325 Pa) +0.00368 m ² (area of the portion facing the ring body) × 3,330 Pa (vacuum pressure) = 346 N (rounded off to the nearest decimal place) )
Force acting on the intermediate member toward the ring body ... Q
0.0046 m ² (contact area between shutter member and intermediate member) × 3,330 Pa (vacuum pressure) = 15 N (rounded to the nearest decimal place)
The pressing force that actually acts on the intermediate member toward the shutter member when the upper and lower portions are vacuum... R = PQ
346-15 = 331N

As described above, the pressing force R actually acting on the intermediate member toward the shutter member when the upper portion and the lower portion are vacuum is the pressing force O actually acting toward the shutter when the upper portion is atmospheric pressure and the lower portion is vacuum. 1.37 times (hereinafter rounded off). It can be said that it is within the allowable range that the pressing force of the shutter member 85 by the intermediate member 89 is within 1.4 times when the pressure difference between both sides of the shutter member 85 is the same. In addition, with regard to the above calculation formulas 1 to 6, the calculation was performed based on an example in which the degree of vacuum was −98 kPa, but the actual degree of vacuum differs depending on the capacity of the vacuum pump and the leakage from the heating cylinder of the injection molding machine, and the atmospheric pressure Also varies from day to day. If the degree of vacuum and the atmospheric pressure are different, the pressing force according to the calculation formula is different. Therefore, the ratio of the contact surface of the intermediate member 89 to the facing surface 89c (the surface communicating with the opening 89a) and the intermediate member 89 are different. The ratio of the pressing force of the shutter member 85 due to the above does not correspond to the theory.

However, in the case where the areas of the abutting surface 89b and the facing surface 89c (surfaces communicating with the opening) are the same or different, both the case where the upper part is atmospheric pressure and the lower part is vacuum and the upper part and the lower part are In the case of a vacuum, the pressure sent to the first air chamber 92 may be changed to adjust the pressing force with which the intermediate member 89 contacts the shutter member 85. The shutter member 85 is strongly pressed against the mounting plate 86 by increasing the pressing force.

Next, a shutter device 111 according to a fifth embodiment shown in FIG. 10 will be described. In the description of the shutter device 111 of the fifth embodiment, the same reference numerals as those of the fourth embodiment are attached to the same or corresponding parts, and the description is omitted. In the fifth embodiment, a communication path 113 is also formed in the second air chamber 112 corresponding to the second air chamber 94 of the fourth embodiment, and low-pressure gas is sent to the second air chamber 112. It is characterized by that. The small diameter portion 91 on the shutter member 85 side of the intermediate member 89 is provided with an O-ring 117 serving as a seal member to seal the second air chamber 112. Further, the first air chamber 92 and the second air chamber 112 are connected to different regulators 96 and 115 through different pipe lines 95 and 114. The regulators 96 and 115 are connected to the pump 98 via the distribution valve 116. In the fifth embodiment, the intermediate member 89 can be pressed and brought into contact with the shutter member 85 with a further optimum pressure by adopting the above-described configuration. In FIG. 10, the guide plate 118 is also provided on the lower surface of the upper case plate 83 so that the shutter member 85 is slid between the mounting plate 86 and the guide plate 118. The vertical movement of the shutter member 85 is prevented. A self-lubricating type resin is preferably used for the mounting plate 86 and the guide plate 118.

The present invention is not limited to the embodiments described above, and various modifications can be added and implemented without departing from the spirit of the invention. The main body member of the shutter device may be a part of the outer shell of the airtight structure. Further, the shutter member of the shutter device may be one in which the flat plate rotates around one point other than the one that reciprocates. In addition, the shutter member may move in the vertical direction or in an oblique direction. Furthermore, the opening of the shutter device is not limited to a circle, but may be a rectangle or other shapes. The shape of the cylinder composed of the main body member and the intermediate member of the shutter device is not limited to the embodiment shown in FIGS. 6 to 10, and various shapes are assumed. Furthermore, the airtight structure to which the shutter device of the present invention is attached may be an injection molding machine, an extruder, a kneader, or the like, and further a vacuum such as a press device, a laminator device, a semiconductor manufacturing device, or a vapor deposition device. You may provide the shutter apparatus of this invention in the opening part of a chamber and the exterior. Further, as the airtight structure, in addition to the vacuum structure, a fluid such as gas or vapor may be sealed in the structure.

It is sectional drawing of the injection apparatus with which the shutter apparatus of this embodiment was attached. It is sectional drawing of the shutter apparatus of this embodiment. It is a horizontal sectional view in the AA line in FIG. It is sectional drawing of the shutter apparatus of another embodiment, Comprising: It is a figure which shows a state with a open shutter. It is sectional drawing of the shutter apparatus of another embodiment, Comprising: It is a figure which shows a state with a closed shutter. It is sectional drawing of the shutter apparatus of another embodiment, Comprising: It is a figure which shows a shutter in the open state. It is sectional drawing of the shutter apparatus of another embodiment, Comprising: It is a figure which shows the state at the time of a shutter opening and closing. It is sectional drawing of the shutter apparatus of another embodiment, Comprising: It is a figure which shows a state with a closed shutter. It is sectional drawing of the shutter apparatus of 4th Embodiment, Comprising: It is a figure which shows a shutter in the open state. It is sectional drawing of the shutter apparatus of 5th Embodiment, Comprising: It is a figure which shows a state with a open shutter.

Explanation of symbols

11 Injection device 13 Material supply device (airtight structure)
15 Heating cylinder (airtight structure)
24a, 41a, 47a, 64a, 88a, 89a Opening 25, 26, 61, 71, 81, 111 Shutter device 41, 62, 72, 82 Body member
42, 63, 73, 85 Shutter member 42b, 63b, 73b, 85b surface (surface of shutter member)
47, 64, 74, 89 Intermediate member 47b, 64b, 74b, 89b surface (surface of intermediate member)
50, 66 Spring (Pressing means)
51, 65, 76 O-ring (pressing means)
75, 92, 94, 112 Air chamber (pressing means)

Claims (9)

In a shutter device of an airtight structure provided with a shutter member that opens and closes an opening,
An intermediate member provided between the main body member and the shutter member;
A shutter member slidably contacted with the intermediate member;
A shutter device for an airtight structure, comprising: a pressing unit that is provided between the intermediate member and the main body member and presses the intermediate member toward the shutter member. The shutter device for an airtight structure according to claim 1, wherein the shutter device is provided in a material supply device of an injection device of an injection molding machine. The shutter device for an airtight structure according to claim 1, wherein a seal member is provided between the intermediate member and the main body member separately from the pressing means. The shutter device for an airtight structure according to claim 3, further comprising pressing means for pressing the intermediate member toward the shutter member by fluid pressure or a resilient member. The intermediate member includes a surface that contacts the shutter member, a facing surface that is provided on the opposite side of the contacting surface and faces the main body member, and an opening through which the molding material passes, and the contacting surface and the facing surface The shutter device for an airtight structure according to any one of claims 1 to 4, further comprising a pressing surface. 6. The shutter device for an airtight structure according to claim 5, wherein an area ratio between the contact surface and the surface communicating with the same atmospheric pressure in the opening of the opposing surface is within 1.25 times. The pressing means of the intermediate member presses the surface abutting on the intermediate member toward the shutter member by exerting low pressure air of atmospheric pressure or higher controlled by a regulator on the pressing surface. The shutter device for an airtight structure according to any one of claims 4 to 6. In the operation method of the shutter device of the airtight structure provided with the shutter member for opening and closing the opening,
An intermediate member provided between the main body member and the shutter member;
A shutter member slidably contacted with the intermediate member,
A method for operating a shutter device of an airtight structure, wherein the pressure of the shutter member by the intermediate member is kept within 1.4 times when the pressure difference between both sides of the shutter member is the same. In the operation method of the shutter device of the airtight structure provided with the shutter member for opening and closing the opening,
An intermediate member provided between the main body member and the shutter member;
A shutter member slidably contacted with the intermediate member,
An operation method of a shutter device of an airtight structure, wherein the intermediate member is pressed toward the shutter member by low-pressure air having an atmospheric pressure or higher controlled by a regulator.

Images