JP5425460B2 - Preform transport plug, blow molding machine, and preform transport plug replacement method - Google Patents

Description

  The present invention relates to a preform conveying plug, a blow molding machine, and a method for replacing a preform conveying plug.

  As a preform carrying plug, one disclosed in Patent Document 1 is known. The preform transport plug supports the preform, transports the preform to the processing step, and is removed from the preform at the end of the processing cycle (see 0004 of Patent Document 1).

In addition, this preform transport plug is used in a blow molding device, and the number of preform transport plugs used in one blow molding device is usually extremely large (see 0005 in Patent Document 1).
JP 2004-512990 A

  Blow molding machines have versatility to blow mold various containers, and the size of the preform varies depending on the size of the blow molded container. If the neck length or caliber of the preform is different, it must be replaced with a plug that matches the preform.

  The present inventors pay attention to the complexity of work when removing a preform carrying plug, for example, a large number of 150-160 used in one blow molding apparatus, from a blow molding machine and replacing it with a new plug. did. Conventionally, every time a large number of preform transport plugs are replaced, a drive molding stop time (down time) occurs in the blow molding machine, and the production throughput may be reduced.

  An object of some aspects of the present invention is a preform transport plug that can be attached to and detached from a blow molding machine with one touch without the need of a tool, a blow molding machine using the same, and a blow molding machine. An object of the present invention is to provide a method for replacing a preform carrying plug.

  One aspect of the present invention is a preform transport plug that is attached to a transport member and transports a preform. The preform transport plug includes a base portion supported by the transport member and an attachment / detachment portion attached to and detached from the base portion. A preform holding portion that holds a neck portion of the reform, wherein the detachable portion includes a locked portion that is locked to the base portion, and the base portion is a lock that locks the locked portion. And a moving member that is moved to a first position that maintains a locked state where the locked portion is locked by the locking portion and a second position that releases the locked state, and the moving member And a biasing member that moves and biases so as to be maintained at the first position.

  According to one aspect of the present invention, in order to remove the preform holding portion from the base, the moving member is moved toward the second position against the urging force of the urging member by an external force. Accordingly, the locked portion of the detachable portion is released from the locked state by the locking portion of the base portion, and the preform holding portion including the detachable portion can be removed from the base portion. On the other hand, in order to attach the preform holding part to the base, the external force is released and the moving member is moved toward the first position by the urging force of the urging member. In the first position, the moving member restricts the locking portion from moving radially outward. As a result, the locking portion of the base portion locks the locked portion of the detachable portion, so that the preform holding portion including the detachable portion is attached to the base portion. As described above, the preform holding portion can be attached to and detached from the base portion with one touch without requiring a tool or the like while the base portion is fixed to the transport member.

  In one aspect of the present invention, the detachable portion includes a shaft portion, the locked portion is a plurality of recesses arranged at different positions in the circumferential direction on the peripheral surface of the shaft portion, and the base portion The first cylinder part through which the shaft part is inserted may be included, and the locking part may be a plurality of spheres protruding from the inner wall surface of the first cylinder part and entering the plurality of recesses.

  By making the latching part a spherical body, it is possible to smoothly enter and exit the recessed part that is the latched part, and by providing a plurality of latching parts and latched parts, the detachable part is stably held with respect to the base part. it can.

  In one aspect of the present invention, the first cylindrical portion has a plurality of through holes that penetrate from the inner wall surface to the outer wall surface, and each of the plurality of spheres is disposed, and the through hole is formed on the inner wall surface. A first hole having a second diameter smaller than the first diameter of the sphere, and a second hole having a third diameter larger than the first diameter and opening in the outer wall surface. And a tapered hole having a diameter that decreases from the second hole toward the first hole, and the moving member includes a second tube portion that is guided to move along the outer wall surface of the first tube portion. can do.

  In one aspect of the present invention, an end surface of the moving member may be formed with a guide surface that moves and guides the locking portion so as to be in the locked state toward the first position. Thereby, when a moving member is set to the 1st position, a to-be-latched part can be reliably latched by a latching part, and a detachable part can be attached to a base.

  In one aspect of the present invention, the detachable portion includes an insertion portion that is inserted into the neck portion of the preform, and an end surface abutting portion that abuts on an end surface of the neck portion, and the insertion portion includes the neck portion. A first air vent groove formed along the axial direction of the portion, and the end surface abutting portion communicates with the first air vent groove and is formed along the radial direction of the neck portion to communicate with the outside air. A second air vent groove may be included.

  Thus, when the insertion portion of the detachable portion is inserted into the neck portion of the preform, the air in the neck portion can be released to the outside through the first and second air vent grooves.

  In one aspect of the present invention, the preform holding portion includes a plurality of contact pieces that elastically contact the inner wall surface of the neck portion at a plurality of locations in the circumferential direction of the neck portion, and the plurality of contact portions A gap for guiding the air in the preform to the first air bleeding groove can be formed between the pieces.

  Thus, when the neck holding portion of the detachable portion is inserted into the neck portion of the preform, the air in the preform is interposed between the detachable portion and the neck holding portion via the gaps between the plurality of contact pieces. The air is guided to the space, and the air can be released to the outside through the first and second air vent grooves. For this reason, the neck part of the preform can be smoothly attached and detached by the preform holding part.

Another aspect of the present invention is a blow molding machine for blow molding a preform into a container.
The plurality of preform transport plugs according to any one of claims 1 to 6, which hold the preform, and a transport member to which each base of each of the plurality of preform transport plugs is attached. To do.

According to another aspect of the present invention, the plurality of preform transport plugs provided in the blow molding machine are preformed with respect to the base when the diameter and / or length of the neck portion of the preform is changed. It is only necessary to attach and detach the holding part. Therefore, the work load required every time the type of molded product is changed, including multi-product small-quantity production, etc., is greatly reduced. In another aspect of the present invention, the conveying member comprises a plurality of links in a hollow pin. The blow molding machine slides in the hollow pin, and a base support shaft to which the base of the preform transport plug is attached, and is disposed in the hollow pin and supports the base. A pressing member that presses the shaft in one direction in the axial direction and maintains the holding position for holding the preform by the preform holding portion, and the base support shaft is driven in the other direction in the axial direction. And a drive part for detaching the preform holding part from the preform.

  In this way, a large number of preforms can be transported at an integral multiple of the link pitch of the transport chain, and the preform can be detached from the preform transport plug at a predetermined position by driving the drive unit.

  In another aspect of the present invention, the apparatus further includes a conveyance chuck portion that receives the preform conveyed by the preform conveyance plug, and the conveyance chuck portion always includes a pair of chuck members and the pair of chuck members. A closing biasing member that moves and biases in the closing direction; and a transfer arm that supports the pair of chuck members and drives to advance and retreat with respect to the preform transfer plug. When the pair of chuck members are moved forward without holding the reform, a notch for preventing interference with the minimum width portion of the pair of chuck members can be formed.

  In this way, even when the blow molding machine is trial run without conveying the preform, it is possible to prevent the preform conveying plug not holding the preform from interfering with the pair of chuck members.

  Still another aspect of the present invention is a method of replacing a preform transport plug in a blow molding machine according to another aspect of the present invention, wherein the base is shared with respect to a change in the size of the preform, Plural types of the preform holding portions are prepared according to the size of the preform, and the diameter of the neck portion and / or the length of the neck portion of the preform is selected from the plurality of types of preform holding portions. One type of preform holding portion corresponding to the above is selected and attached to the base portion.

  As described above, in the blow molding machine according to the present invention, it is only necessary to attach and detach the preform holding portion with respect to the base portion in accordance with the size change of the preform.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to comparative examples. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

(Outline of preform transport plug)
FIG. 1 is a schematic explanatory view in which a part of a preform carrying plug according to an embodiment of the present invention is cut away. FIG. 2 is a schematic explanatory view of a preform carrying plug as a comparative example. First, an outline of the preform carrying plug will be described using the comparative example of FIG.

  In FIG. 2, the preform 10 has an open neck 12, a shoulder 14 following the neck 12, a trunk 16 following the shoulder 14, and a bottom 18 that closes the end of the trunk 16. . The neck portion 12 has a support ring 20 at a boundary position with the shoulder portion 14.

  A preform transport plug 30 as a comparative example shown in FIG. 2 is a base 40 fixed to a chain, for example, a transport member of a blow molding machine, and is fixed to the base 40 with a bolt 50, and the neck of the preform 10 And a preform holding part 60 for holding the part 12.

  In the preform carrying plug 30 as a comparative example, when the size of the preform 10 is changed, the base portion 40 and the preform holding portion 60 are integrally removed from the blow molding machine. However, when the number of replacements is as large as 150-160, the work burden of removing the screw portion 41 provided on the base 40 using a tool is excessive. Thereafter, it is also necessary to attach a new base 40 and preform holding unit 60 to the chain using a tool. For this reason, it took more than one day to replace the preform carrying plug 30 alone. Even if the preform holding part 60 is removed from the base part 40 while the base part 40 is fixed to the blow molding machine, the work is a work for removing the bolt 50 and is not different from the work burden for removing the base part 40. Moreover, as described later, in the comparative example, it is necessary to remove the base 40 as well.

(Preform transport plug according to the embodiment)
As shown in FIG. 1, the improved preform transport plug 100 includes a base 110 that is supported by, for example, a transport chain that is a transport member of a blow molding machine, and a preform holder that holds a neck portion 12 of the preform 10. 200. The preform holding part 200 includes an attaching / detaching part 210 detachably attached to the base part 110 and a neck holding part 250.

  The detachable part 210 includes a locked part 211. The base 110 can include a locking portion 111 that locks the locked portion 211, a moving member 120, and a biasing member 130.

  The moving member 120 has a first position P1 (position shown on the right side in FIG. 1) where the locked portion 211 is locked by the locking portion 111 and a second position where the locked state is released. It is moved to position P2 (position shown on the left side of FIG. 1). In the first position P <b> 1, the radial position of the locking portion 111 is restricted by the moving member 120, and the locked state in which the locked portion 211 is locked by the locking portion 111 is maintained. The biasing member 130 moves and biases the moving member 112 so as to maintain the first position P1.

  In this way, the preform holding part 200 including the attaching / detaching part 210 can be attached to and detached from the base part 110. In order to remove the preform holding part 200 from the base part 110, the moving member 120 is moved in the F1 direction toward the second position P2 in FIG. 1 by an external force. This movement is performed against the urging force of the urging member 130 in the direction F2 in FIG. If it carries out like this, the freedom degree which the to-be-latched part 211 will move to F4 direction of FIG. 1 will arise. Thereby, the locking part 111 can be detached from the locked part 211 of the attaching / detaching part 210. Accordingly, the locked portion 211 is released from the locked state by the locking portion 111, and the preform holding portion 200 including the detachable portion 210 can be removed from the base 110 with one touch without requiring a tool or the like.

  On the other hand, in order to attach the preform holding part 200 including the attaching / detaching part 210 to the base part 110, the moving member 120 shown on the left side of FIG. 1 is pushed down in the F2 direction. This movement can be performed using the moving biasing force of the biasing member 130. Thus, the moving member 120 moves from the second position P2 shown on the left side of FIG. 1 to the first position P1 shown on the right side of FIG. At the first position P1, the moving member 120 restricts the locking portion 111 from moving radially outward. As a result, the locked state in which the locking part 111 locks the locked part 211 can be maintained. Thus, the preform holding part 200 including the attaching / detaching part 210 is attached to the base part 110 with one touch without requiring a tool or the like.

  Here, the attaching / detaching portion 210 may include a shaft portion 212. In this case, the locked portion 211 can be a plurality of concave portions arranged at different positions in the circumferential direction on the peripheral surface of the shaft portion 212. Meanwhile, the base portion 110 may include a first tube portion 112 through which the shaft portion 212 is inserted. In this case, the locking portion 111 can be a plurality of spheres that protrude from the inner wall surface 112 </ b> A of the first tube portion 112 and enter the plurality of recesses (locked portions) 211. By making the locking part 111 into a spherical body, it is possible to smoothly go into and out of the recessed part 211 that is the locked part, and by providing a plurality of the locking part 111 and the locked part 211, the detachable part 210 is attached to the base 110. It can be held stably.

  An example of the base 110 is shown in FIG. As shown in FIG. 3A, the base 110 includes a first flange 113, a first tube portion 112 provided on one surface (for example, the lower surface) of the first flange 113, and the other of the first flange 113. A shaft 114 provided on the surface (for example, the upper surface) is integrally provided. A screw portion 115 is formed on the shaft portion 114. As shown in FIG. 3B, the contour shape of the first flange 113 is, for example, hexagonal so that the screw portion 115 can be rotated with a wrench or the like. Note that once the base 110 is attached to the conveying member, it is not necessary to attach or detach it thereafter. In addition, a mode of fixing to the conveying member of the blow molding machine with the screw portion 115 will be described later.

  The first cylindrical portion 112 has a plurality of through holes 116 that penetrate from the inner wall surface 112A to the outer wall surface 112B and in which a plurality of spheres (locking portions) 111 are respectively arranged. As shown in FIG. 3B, three through holes 116 are provided at intervals of 120 degrees, for example. The through hole 116 opens at the inner wall surface 112A, opens to the first hole 116A having a second diameter smaller than the first diameter of the sphere (locking portion) 111, and the outer wall surface 112B, and is larger than the first diameter. And a second hole 116B having a large third diameter. The through hole 116 can be formed as a tapered hole having a taper angle θ shown in FIG. 3B so that the diameter decreases from the second hole 116B toward the first hole 116A. In this way, the sphere (locking portion) 111 can be accommodated in the through hole 116, and a part of the sphere (locking portion) 111 can be protruded from the first hole 116A. In addition, a circumferential groove 117 is formed on the outer wall on the opening end side of the first cylindrical portion 112. For example, a C-ring 118 is attached to the circumferential groove 117 as a member for preventing the moving member 120 shown in FIG.

  As shown in FIG. 1, the moving member 120 can be composed of a second cylindrical portion 122 that is guided to move along the outer wall surface 112 </ b> B of the first cylindrical portion 112. As shown in FIG. 4, the second cylindrical portion 122 has a second flange 124 at one end. A chamfered portion 126 is provided from the inner wall surface 122 </ b> A of the second cylindrical portion 122 to the second flange 124. As shown in FIG. 1, the chamfered portion 126 functions as a guide surface that moves and guides the sphere (locking portion) 111 in the F3 direction facing radially inward when the moving member 120 is moved in the F2 direction. To do.

  The biasing member 130 can be formed by a compression coil spring, for example. The compression coil spring 130 is mounted around the moving member 120. More specifically, the compression coil spring 130 is accommodated between the first flange 113 of the base 110 and the second flange 124 of the moving member 120. Thus, the moving member 120 is moved and biased in the direction of the arrow F2 in FIG. 1 by the biasing force of the compression coil spring 130.

  Next, an example of the neck holding part 250 provided in the preform holding part 200 of the preform transport plug 100 will be described. A screw hole 213 is formed in the attaching / detaching portion 210, and a bolt 252 inserted through a through hole 251 formed in the neck holding portion 250 is screwed into the screw hole 213, so that the neck holding portion 250 is fixed to the attaching / detaching portion 210. Is done.

  The neck holding portion 250 includes a holder 260 (see also FIG. 5) in which a through-hole 251 is formed, and neck contact pieces supported by the holder 260, for example, three split rings 270 (FIGS. 6A and 6B). See also).

  The holder 260 has a lower flange 262 in which a groove 261 is formed, and an upper flange 263 that is spaced apart from the lower flange 262. As shown in FIG. 1, the upper flange 263 forms a groove 264 between the facing surface of the insertion portion 215 that protrudes from the lower end of the detachable portion 210 and is inserted into the neck portion 12 of the preform 10.

  The three split rings 270 have a ring shape that is divided into three in the circumferential direction, a neck contact surface 271 is formed on the outer peripheral surface, and insertion ring portions 272 and 273 are formed on the upper and lower sides thereof. . The upper and lower insertion ring portions 272 and 273 are fitted into the two grooves 261 and 264 as shown in FIG. 1, so that the three split rings 270 are supported by the holder 260.

  Further, as shown in FIG. 1, between the lower flange 262 and the upper flange 263 of the holder 260, a plurality of, for example, three split rings (neck abutment pieces) 270 are moved outward in the circumferential direction. A biasing member, such as an O-ring 280, is disposed. Due to the elastic force of the O-ring 280, the three split rings 270 can be elastically fitted into the neck portion 12 of the preform 10 as shown in FIG.

  Here, the preform holding unit 200 is provided with an air vent structure for guiding the air inside the preform 10 to the outside when the preform 10 is held. FIGS. 7A and 7B show the lower end of the detachable portion 210. Referring also to FIG. 1, the detachable portion 210 includes an insertion portion 215 that is inserted into the neck portion 12 of the preform 10, and an end surface abutting portion 217 that abuts on the end surface (top surface) of the neck portion 12. Yes. The insertion portion 215 includes two first air bleeding grooves 216 formed along the axial direction of the neck portion 12 at a plurality, for example, two locations in the circumferential direction. The end surface abutting portion 217 includes two second air vent grooves 218 that communicate with the two first air vent grooves 216 and that are formed along the radial direction of the neck portion 12 and communicate with the outside air. As described above, when the insertion portion 215 of the attachment / detachment portion 210 is inserted into the neck portion 12 of the preform 10, the air in the neck portion 12 is made outside via the first and second air bleeding grooves 216 and 218. I can escape.

  As shown in FIG. 6B, a gap 274 that guides the air in the preform 10 to the first air vent groove 216 between the three split rings (neck abutting pieces) 270 of the neck holding portion 250. Is formed. For this reason, when the three split rings 270 are inserted into the neck portion 12 of the preform 10, the air in the preform 10 escapes upward along the gap 274, and the detachable portion 210 and the neck holding portion 250. Guided to the space between. Subsequently, when the neck holding portion 250 of the attaching / detaching portion 210 is inserted into the neck portion 12 of the preform 10, the air in the preform 10 passes through the gaps 274 between the plurality of split rings (contact pieces) 270. Thus, the air is guided to the space between the attaching / detaching portion 210 and the neck holding portion 250, and this air can be released to the outside via the first and second air vent grooves 216 and 218. For this reason, the neck part 12 of the preform 10 can be smoothly attached and detached by the preform holding part 200.

(Blow molding machine)
FIG. 8 is a schematic plan view showing an example of a blow molding machine 300 using the preform carrying plug 100 described above. As shown in FIG. 8, a preform supply unit 310, a heating unit 320, a mold release unit 330, and a blow molding unit 340 are provided on the machine base 301. For example, the container is taken out at a position protruding from the side surface of the machine base 301. A part 350 is arranged. An endless conveyance member, for example, a conveyance chain 360 is stretched over the arrangement region of the preform supply unit 310, the heating unit 320, and the mold release unit 330. In addition, a rotation chain 390 that rotates the preform rotates over the arrangement area of the heating unit 320.

  This blow molding machine 300 is used in a two-stage method (cold parison method). A preform (parison) 10 mass-produced by an injection molding machine (not shown) is once cooled to room temperature, and then this blow molding machine. The preform 10 is supplied to the supply unit 310 of 300.

  For example, a star wheel or the like is used as the supply unit 310, and the preform 10 is received by the rotating star wheel, and the preform 10 is held by the preform conveying plug 100 that is rotationally conveyed and attached to the conveying chain 360. Along with the movement of the transport chain 360, the preform 10 is heated by the heating unit 320 to have an appropriate blow temperature in the process of being transported along the forward path in the direction of arrow D1 and the return path in the direction of arrow D2 in FIG. The heating unit 320 is configured, for example, by arranging an infrared heater on one side of the preform heating conveyance path and a reflecting plate on the other side, and at least while the preform 10 is continuously conveyed along the preform heating conveyance path. In the meantime, the preform 10 is driven to rotate by the rotation chain 390. The rotation chain 390 is driven in a direction opposite to the driving direction of the transport chain 360.

  The plurality of preforms 10 heated by the heating unit 320 are removed (released) from the preform transport plug 100 by the release unit 330 and transferred to the plurality of first delivery members. The plurality of first delivery members are reciprocated between the release part 330 and the blow molding part 340 in the direction of the arrow D3 in FIG. Hand over the reform 10. In the blow molding unit 340, the blow core mold and the stretching rod are respectively arranged on the neck portions of the plurality of preforms 10 supported by the clamped blow cavity mold, and the longitudinal axis driving of the stretching rod and the introduction of blow air are performed. A plurality of blow-molded containers are simultaneously molded from the plurality of preforms 10.

  A plurality of second delivery members that are reciprocated in the direction of arrow D4 in FIG. 8 are further provided across the blow molding part 340 and the container take-out part 350. The plurality of blow-molded containers are delivered from the blow cavity mold to the plurality of second delivery members, and taken out to the outside of the blow molding machine 300 through the container take-out unit 350.

(Relationship between transport member and preform transport plug base)
FIG. 9 is a side view showing the relationship between the transport member 360 and the base 110 of the preform transport plug 100. The conveyance chain 360 that is a conveyance member includes a plurality of unit units in which two links 361 and 362 adjacent on the upper side and two links 363 and 364 adjacent on the lower side are connected by a hollow pin 365. As shown in the cross-sectional view that is a part of FIG. 9, the hollow pin 365 has an extended portion that protrudes and extends to one of the links 361 to 364, for example. In the hollow pin 365, a roller 367 is disposed in the region between the links 362 and 363 via a bush 366. A sprocket is provided at the end of the stretched region of the transport chain 360 shown in FIG. 8, and the sprocket teeth enter between two adjacent rollers 367 to drive the transport chain 360.

  As shown in the sectional view of a part of FIG. 9, a base support shaft 370 that supports the base 110 of the preform transport plug 100 is slidable in the axial direction via a bush 368 in the hollow pin 365. Has been placed. A screw hole 371 into which the screw portion 115 of the base 110 is screwed is formed at one end, for example, the lower end of the base support shaft 370.

  The base support shaft 370 is provided with a stepped flange 372, while a spring receiving member 369 is fixed in the hollow pin 365. A pressing member, for example, a compression coil spring 373, which is disposed in the hollow pin 365 and is inserted through the base support shaft 370, is disposed between the stepped flange 372 and the spring receiving member 369. As a result, the base support shaft 370 is always urged downward by the pressing force of the compression coil spring 373. That is, in a state where an external force other than the compression coil spring 373 is not acting on the base support shaft 370, the base support shaft 370 and the preform transport plug 100 supported by the base support shaft 370 hold the preform 10 shown in FIG. Set to position.

  A plug driving member 380 is disposed at the other end of the base support shaft 370, for example, at the upper end. By applying an external force that pushes the plug drive member 380 upward from the position shown in FIG. 9 by the drive unit 382 shown in FIG. 10, the base support shaft 370 and the preform transport plug 100 supported by the base support shaft 370 can be 10 necks 12 are pulled out (released). This mold release drive is performed by a mold release unit 330 shown in FIG. In addition, in the supply part 310 of FIG. 8, the operation | movement contrary to the mold release part 330 is implemented, the restriction | limiting by the restriction member (for example, cam) which pushes up the plug drive member 380 to an upper position is cancelled | released, and the compression coil spring 373 is pressed. The preform carrying plug 100 is inserted into the neck portion 12 of the preform 10 by the urging force.

  A sprocket 381 for rotating the preform 10 is fixed to the other end of the base support shaft 370, for example, the upper end. The sprocket 381 is rotated by meshing with the rotation chain 390 shown in FIG. 8 and rotates the preform 10 held by the preform conveyance plug 100 via the base support shaft 370.

(Preform delivery member)
11 and 12 show that the preform 10 is received from the preform transport plug 100 and transported to the blow molding unit 340, or the container is transported from the blow molding unit 340 to the container take-out unit 350. The conveyance chuck | zipper part 400 which is a delivery member is shown. The conveyance chuck unit 400 includes a pair of arm members 402 and 403 that are opened and closed like a ridge with the fulcrum shaft 401 as a fulcrum. At one end of the fulcrum shaft 401 of the pair of arm members 402 and 403, a closing biasing member that constantly biases the pair of arm members 402 and 403 in the closing direction between the pair of arm members 402 and 403. A compression coil spring 404 is arranged. Chuck members 405 and 406 for chucking the preform 10 are fixed to the other end of the fulcrum shaft 401 of the pair of arm members 402 and 403 at a position immediately above the support ring 20 of the preform 10 shown in FIG. ing. The fulcrum shaft 401 is attached to the transfer arm 407, and the transfer chuck portion 400 is reciprocated in the direction of arrow D3 or arrow D4 in FIG. To be implemented. When the conveyance chuck unit 400 is driven forward with respect to the preform 10, the pair of arm members 405 and 406 are pushed and expanded by the preform 10 against the urging force of the compression coil spring 404, thereby causing the preform 10 to move. Can be chucked. The chuck members 405 and 406 are mold parts and can have design dimensions corresponding to the size of the preform 10.

(How to replace the preform transport plug)
13 and 14 show two types of preform holding portions 200A and 200B corresponding to the preforms 10A and 10B having different sizes. 13 and 14, the base 110 fixed to the base support shaft 370 of FIG. 9 is common. In FIG. 13 and FIG. 14, what is necessary for the blow molding machine 300 is that the preforms 10A and 10B side have a reference height BH on the blow molding machine 300 side, regardless of the preforms 10A and 10B having different sizes. The reference height PH is constant. Otherwise, the conveyance chuck portion 400 shown in FIGS. 9 and 11 cannot hold the preform 10 directly above the neck portion 10, and further, the heating portion 320 is located at one end side from the support ring 20 of the preform 10. This is because the biaxially stretched region extending from the shoulder portion 14 to the trunk portion 16 cannot be heated.

  In the present embodiment, if the upper surface of the first flange 113 of the base 110 is the reference height BH on the blow molding machine 300 side, the preform 10A with respect to the reference height BH in any of FIGS. The distance L to the reference height (the lower surface height of the support rings 20A and 20B) PH on the 10B side is constant. In other words, the preform holding portions 200A and 200B are selectively used so that the reference height PH on the preforms 10A and 10B side is constant. The reference height BH on the blow molding machine 300 side may be the height of the upper surface of the machine base 301 shown in FIG. 8. In short, the reference height BH is a reference height for transporting the preform 10 by the blow molding machine 300. If it is good.

  As apparent from the comparison between FIGS. 13 and 14, the axial length of the neck portion 12A in FIG. 13 is longer than the axial length of the neck portion 12B in FIG. For this reason, the length L1 from the reference height BH to the lower surface of the detachable portion 210A shown in FIG. 13 is shorter than the length L2 from the reference height BH to the lower surface of the detachable portion 210B shown in FIG. 14 (L1 < L2). That is, when the length of the neck portion 12 of the preform 10 is different, the shape of the detachable portion 210 needs to be changed. Thereby, in any case of Drawing 13 and Drawing 14, standard height PH by the side of preform 10A, 10B can be made constant with respect to standard height BH.

  As is clear from the comparison between FIGS. 13 and 14, the diameter of the neck portion 12A in FIG. 13 is narrower than the diameter of the neck portion 12B in FIG. For this reason, in FIG.13 and FIG.14, the shape of neck holding | maintenance part 250A, 250B inserted by each neck part 12A, 12B is also different.

  That is, when the length and the diameter of the neck portion 12 of the preform 10 are changed, it is understood that not only the neck holding portion 250 but also the attaching / detaching portion 210 needs to be changed. Of course, when the length of the neck portion 12 is constant and only the caliber is different, the detachable portion 210 can also be used. However, since such a case is rare, the preform 10 is formed on the preform 10 with respect to the base portion 110. It is necessary to prepare the preform holding part 200 having the unique attaching / detaching part 210 and the neck holding part 250.

  11 and 12, since the reference height PH of the preform 10 is constant, only the chuck members 405 and 406 are adjusted to the size of the neck portion 12 of the preform 10. Change it. FIG. 13 shows chuck members 405A and 406A having a shape suitable for the neck portion 12A, and FIG. 14 shows chuck members 405B and 406B having a shape suitable for the neck portion 12B.

  In general, in the adjustment process or trial operation before and after the shipment of the blow molding machine 300, the operation state of each part is confirmed without supplying the preform 10 before the normal operation state in which the preform 10 is supplied and operated. 11 and 12 is maintained in the most closed state by the compression coil spring 404 when the preform 10 is not present. If the preform 10 is not present, the transport chuck portion 400 is advanced toward the preform transport plug 100 in a closed state. The portions with the smallest width (minimum width portion) of the chuck members 405A and 406A at this time are indicated by reference numerals 410A and 410A in FIG. 13, and similarly the portions with the smallest width (minimum width portion) of the chuck members 405B and 406B are shown. 13 is denoted by reference numerals 410B and 410B. In FIG. 13, in order to prevent interference with the minimum width portions 410A and 410A of the chuck members 405A and 406A, a notch 262A in which the corner at the lowermost end of the neck holding portion 250A is chamfered is formed. On the other hand, in FIG. 14, in order to prevent interference with the minimum width portions 410B and 410B of the chuck members 405B and 406B, the split ring (neck abutting piece) 270B of the neck holding portion 250B has a groove-shaped notch 275. Is formed. In this way, it is possible to prevent the chuck members 405 and 406 from interfering with the preform transport plug 100 even in the operation confirmation process in which the preform 10 is not supplied.

  Although the present embodiment has been described in detail as described above, those skilled in the art can easily understand that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings.

  For example, the present invention is suitable for a plug that conveys the preform 10 in an upright state with the neck portion 12 of the preform 10 up, but the preform 10 in an inverted state with the neck portion 12 of the preform 10 down. It can also be used for those that transport the. Moreover, although applied to what conveys preform 10 to the heating part 320 in embodiment mentioned above, you may use it as a conveyance plug in the blow molding machine 300 in another location. The blow molding machine 300 is not limited to the one used in the two-stage method (cold parison method) described above, but is a one-stage method (hot parison) in which a container is blow-molded from a preform (parison) that retains heat during injection molding. Method).

It is the schematic explanatory drawing which notched some preform conveyance plugs concerning one Embodiment of this invention. It is a schematic explanatory drawing of the preform conveyance plug which is a comparative example. 3A is a front view of the base, and FIG. 3B is a bottom view of the base. It is the front view which notched a part of moving member. It is a schematic explanatory drawing of the holder which is one element of a neck holding part. 6A and 6B are a front view and a plan view of three split rings, which are one element of the neck holding portion. 7A and 7B are schematic explanatory views for explaining the first and second air vent grooves formed in the attaching / detaching portion. It is a schematic plan view of a blow molding machine. It is a side view which shows the relationship between a conveyance member and the base of a preform conveyance plug. It is a schematic explanatory drawing of the drive part driven to the axial direction of a preform conveyance plug. It is a top view of a preform delivery member. It is a front view of a preform delivery member. It is a schematic explanatory drawing which shows the preform holding | maintenance part matched with one of the multiple types of preforms from which size differs. It is a schematic explanatory drawing which shows the preform holding | maintenance part matched with other one of the multiple types of preform from which size differs.

Explanation of symbols

  10 Preform, 12 Neck, 20 Support Ring, 100 Preform Transport Plug, 110 Base, 111 Locking Part (Sphere), 112 First Tube, 112A Inner Wall, 112B Outer Wall, 113 First Flange, 115 Screw Part, 116 through-hole, 116A first hole, 116B second hole, 117 circumferential groove, 118 retaining member (C-ring), 120 moving member, 122 second tube part, 124 second flange, 130 urging member ( Compression spring), 200, 200A, 200B preform holding part, 210 attaching / detaching part, 211 locked part (recessed part), 212 shaft part, 213 screw hole, 215 insertion part, 216 first air vent groove, 217 end face contact Contact portion, 218 second air vent groove, 250 neck holding portion, 251 through hole, 252 bolt, 260 Ruder, 261 groove, 262 Lower flange, 262A Notch, 263 Upper flange, 264 groove, 270 Split ring (neck abutment piece), 271 Neck abutment surface, 272, 273 Insert ring part, 274 Gap, 275 Cut Notch part, 300 blow molding machine, 301 machine stand, 310 supply part, 320 heating part, 330 mold release part, 340 blow molding part, 350 container take-out part, 360 transport chain (transport member), 361-364 link, 365 hollow Pin, 366, bush, 367 roller, 368 bush, 369 spring receiving member, 370 base support shaft, 371 screw hole, 372 stepped flange, 373 compression coil spring (pressing member), 380 plug drive member, 381 sprocket, 382 drive Part, 390 chain for rotation, 4 00 Conveying chuck part, 401 fulcrum shaft, 402, 403 A pair of arm members, 404 Closing biasing member (compression coil spring), 405, 406 Chuck member, 407 Conveying arm, 410A, 410B Minimum width part

Claims (10)

In the preform transport plug attached to the transport member and transporting the preform,
A base including a first tube supported by the conveying member;
A preform holding portion that includes a detachable portion that is attached to and detached from the base, and that holds a neck portion of the preform;
Have
The attaching / detaching portion includes a shaft portion that is inserted into the first tube portion, and a locked portion that is provided on the shaft portion and is locked to the base portion.
The base is
A locking portion for locking the locked portion;
From said first position to maintain the locking state in which the locking portion is locked by the locking portion toward the second position to release the locking state, the at the periphery of the first cylindrical portion a second tubular portion which is moved by an external force along a first cylindrical portion,
An urging member for urging and moving the second cylindrical portion so as to maintain the first position;
A preform carrying plug comprising: In claim 1,
Before Symbol engaged portion is a plurality of recesses arranged in different positions in the circumferential direction at the circumferential surface of the shaft portion,
Before Kigakaritome portion, the first projecting from the inner wall surface of the cylindrical portion, preform transfer plug which is a plurality of spheres that projects into the plurality of recesses. In claim 2,
The first tube portion is
Penetrating from the inner wall surface to the outer wall surface, and having a plurality of through holes in which the plurality of spheres are respectively disposed,
The through hole opens at the inner wall surface, and has a first hole having a second diameter smaller than the first diameter of the sphere, and a third diameter larger than the first diameter that opens in the outer wall surface. And a second hole having a taper hole having a diameter that decreases from the second hole toward the first hole. In claim 3,
The preform transport plug according to claim 1, further comprising: a guide surface that moves and guides the locking portion so as to be in the locked state at an end of the second cylindrical portion . In any one of Claims 1 thru | or 4,
The detachable portion includes an insertion portion that is inserted into the neck portion of the preform, and an end surface abutting portion that abuts on an end surface of the neck portion,
The insertion portion includes a first air vent groove formed along the axial direction of the neck portion,
The preform transport plug, wherein the end surface abutting portion includes a second air vent groove that communicates with the first air vent groove and is formed along a radial direction of the neck portion and communicates with outside air. In claim 5,
The preform holding portion includes a plurality of contact pieces that elastically contact the inner wall surface of the neck portion at a plurality of locations in the circumferential direction of the neck portion,
A preform transport plug, wherein a gap for guiding the air in the preform to the first air vent groove is formed between the plurality of contact pieces. In blow molding machines that blow-mold preforms into containers,
A plurality of preform transport plugs according to any one of claims 1 to 6, which hold the preform;
A transport member to which the base of each of the plurality of preform transport plugs is attached;
A blow molding machine characterized by comprising: In claim 7,
The transport member is a transport chain in which a plurality of links are connected by hollow pins,
The blow molding machine is
A base support shaft that slides within the hollow pin and to which the base of the preform transport plug is attached;
A pressing member that is disposed in the hollow pin and presses the base support shaft in one direction in the axial direction and maintains the preform in the holding position by the preform holding portion;
A drive unit for driving the base support shaft in the other direction in the axial direction to detach the preform holding unit from the preform;
A blow molding machine further comprising: In claim 8,
A transport chuck portion for receiving the preform transported by the preform transport plug;
The transport chuck portion supports a pair of chuck members, a closing biasing member that constantly biases the pair of chuck members in a closing direction, and supports the pair of chuck members to advance and retreat with respect to the preform transport plug. A transport arm for driving,
The preform transport plug is formed with a notch for preventing interference with the minimum width portion of the pair of chuck members when the pair of chuck members are advanced without holding the preform. A blow molding machine characterized by that. A method for replacing a preform carrying plug with the blow molding machine according to any one of claims 7 to 9,
The base is shared for changing the size of the preform, and a plurality of types of the preform holding portions are prepared according to the size of the preform,
One type of preform holding portion corresponding to the diameter of the neck portion and / or the length of the neck portion of the preform is selected from the plurality of types of preform holding portions and attached to the base portion. A method for replacing a preform carrying plug.

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