JP2010247472A - Mold clamping device equipped with two sets of mold clamping mechanisms - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold clamping device which enables synchronizing of mold opening and closing operations of two sets of mold clamping mechanisms movably arranged on a base by a link mechanism arranged on an upper surface of the base. <P>SOLUTION: A mold clamping board is connected with one of a pair of mold mounting plates arranged opposite to the mold clamping board by a tie bar inserted into the other. Two set of mold clamping mechanisms, wherein a plunger of the mold clamping cylinder attached to the mold clamping board is connected with the other mold mounting plate, are movably arranged on the base with a mold opening space so that both of the mold clamping boards are directed to the outside back to back, and thereby the mold clamping device is formed. There is provided a link mechanism, wherein a pair of parallel link plates are formed on the upper surface of the base to alternately and freely move by fitting a cam follower to a link operation plate which rotates around a supporting shaft located between the plates. Two sets of the mold clamping mechanisms are connected with the link plates of the link mechanism. Mold opening and closing operations of the two sets of mold clamping mechanisms are synchronized by the link plates. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mold clamping device having two sets of mold clamping mechanisms that can be used for injection blow molding, stretch blow molding, and the like, each having a pair of mold clamping mechanisms having the same structure installed back to back on a machine base. Is.

  As the mold clamping device of the blow mold machine of the injection stretch blow molding machine, two sets of mold clamping mechanisms with the same structure are installed movably back to back on the machine base with both mold clamps facing outward, There is known a mold clamping device that simultaneously operates the two sets of mold clamping mechanisms and molds a molded product at two locations on a machine base.

Japanese Patent Publication 1-188847

  The mold clamping mechanism in the above-described mold clamping apparatus connects an outer mold mounting plate of a pair of mold mounting plates opposed to each other and a mold clamping machine having a mold clamping cylinder by a tie bar inserted through the inner mold mounting plate. The plunger is connected to the inner mold mounting plate, and the mold clamping machine is movably installed together with the mold mounting plate without being fixed to the machine base. Clamping can be performed by butt-bonding the mold clamping plate and the inner mold mounting plate by extension of the plunger, and mold opening can be performed by attracting the mold clamping plate and the inner mold mounting plate by reducing the plunger.

  In the mutual movement of the mold clamping machine and the inner mold mounting plate due to this tensioning and pulling, if one moving distance becomes longer due to the difference in both operation timings, the other moving distance becomes relatively shorter, and the mold When closed, the mold closing position of the split mold between the inner mold mounting plate and the outer mold mounting plate deviates from the set position. Also, if there is a difference in the operation timing in mold opening, the separated mold will not be separated from the molded product at the same time, and the molded product will be pulled and released while stuck to the divided mold that opens late. As a result, defective products are generated.

  The above-mentioned conventional problems are solved by adopting a rack and pinion mechanism, a link mechanism, etc. to synchronize the operation timing of the mold clamping machine and the inner mold mounting plate, and attaching the tuning means to the mold clamping machine and the inner mold mounting plate. it can. However, in the mold clamping device provided with the two sets of the mold clamping mechanisms, a tuning means for simultaneously controlling the operation timings of both mold clamping mechanisms is required due to the identical molding in the two sets of mold clamping mechanisms. .

  The present invention has been conceived from the above circumstances, and its purpose is to operate in association with two sets of mold clamping mechanisms having the same structure installed on a base plate and at least one set of link mechanism tuning means. An object of the present invention is to provide a mold clamping device having two new sets of mold clamping devices that can perform the mold opening / closing and mold clamping operations of the two sets of mold clamping mechanisms at the same time at the same time.

This invention by the said objective connects the outer type | mold mounting plate of a pair of mold mounting plate which opposes, and the mold clamping board provided with the clamping cylinder by the tie bar penetrated to the inner side mold mounting plate, Two sets of mold clamping mechanisms configured by connecting a plunger to the plate are movable on the base plate with both mold clamping plates facing outwards, with the outer mold mounting plates back to back, and a mold opening space. In the installed mold clamping device,
On the upper surface of the base plate, a link mechanism is constructed in which a pair of parallel link plates are connected by a cam follower that rotates about a support shaft between the plates so as to be movable alternately. The mold clamping mechanism of one mold clamping mechanism is connected to the same link plate on one side of the link mechanism with the mold clamping plate and outer mold mounting plate of one mold clamping mechanism and the inner mold mounting plate of the other mold clamping mechanism. The mold clamping plate and inner mold mounting plate of the mechanism and the outer mold mounting plate of one mold clamping mechanism are connected to the same link plate on the other side, and the mold opening and closing operations of the two sets of mold clamping mechanisms by the link plate It is said to be in tune.

  Each of the mold clamping mechanisms includes a plurality of mold clamping cylinders fixed in parallel to the surface of the mold clamping machine, and the mold clamping cylinder of one of the mold clamping mechanisms is a double-acting piston type, and the other mold clamping mechanism. The mold clamping cylinder of the panel is a single-acting piston type.

  In addition, the two sets of mold clamping mechanisms described above have guide recesses that have outward recesses at the lower ends of both sides of the mold clamping plate and the mold mounting plate, and the recesses are provided on both edges of the base plate. The mold clamping mechanism is movably installed by fitting.

  The link mechanism consists of two sets, both of which are arranged side by side on the base plate, and the mold clamping plate and outer mold mounting plate of one mold clamping mechanism of the two sets of mold clamping mechanisms and the other mold clamping. The inner mold mounting plate of the mechanism is connected to a pair of link plates on the same side of both link mechanisms, the mold clamping plate and inner mold mounting plate of the other mold clamping mechanism, and the outer mold mounting plate of one mold clamping mechanism Are connected to a pair of link plates on the other side of both link mechanisms, and the opening and closing operations of the two mold clamping mechanisms are synchronized by the link plates.

  In the above configuration, the two mold clamping mechanisms movably installed on the base plate and the link mechanism movably installed on the upper surface of the base plate are connected to each other so that both mold clamping mechanisms and the mold mounting are attached. Since the plate operation timing can be controlled simultaneously by controlling the movement of the link plate by the cam follower of the link mechanism, in either of the two sets of mold clamping mechanisms, the mold clamping position shifts due to the mold opening / closing and mold clamping operation differences. In addition, it becomes difficult to cause a mold release failure due to a shift in mold opening timing.

  Since the two mold clamping mechanisms can be operated via the link mechanism, the mold clamping cylinder of the mold clamping mechanism on one side is a piston single-acting type that operates only in the mold closing direction. Since strong clamping can be performed in cooperation with the double-acting type clamping cylinder, it is possible to simplify the clamping cylinder and the operation circuit even in a clamping device including two sets of clamping mechanisms.

  In addition, the two sets of mold clamping mechanisms are movably installed by fitting the recesses at the lower ends of both sides to the guide rails on both edges of the base plate, and connected to the link mechanism on the top surface of the base plate. Since the load of the mold clamping mechanism on the link mechanism is reduced and the mutual movement of the link plates is maintained smoothly even during long-term use, there is no inconvenience of mold opening and closing due to the movement resistance of the link plates. In addition, since the link mechanism is located in the base plate under the mold clamping mechanism, it does not hinder molding work, and rolling guide rails are used for its installation to improve power transmission efficiency via the link mechanism. Further, by adopting two sets of link mechanisms, it is possible to equalize the power transmission to the two sets of mold clamping mechanisms.

It is a perspective view at the time of mold opening of the mold clamping apparatus provided with two sets of mold clamping mechanisms concerning this invention. It is a longitudinal front view same as the above. It is also a longitudinal side view It is a perspective view of the base board which abbreviate | omitted the mold clamping mechanism. FIG. 6 is a plan view schematically showing when the mold is closed (A) and when the mold is closed (B).

  In the figure, reference numerals 1 and 2 denote two sets of mold clamping mechanisms having the same structure on the base plate 10, and the outer mold mounting plates 11 and 21 and the mold clamping machines 12 and 22 of a pair of mold mounting plates facing each other are connected to the inner side. The tie bars 14 and 24 inserted into the mold mounting plates 13 and 23 are connected to each other, and the plungers 15a and 25a of the mold clamping cylinders 15 and 25 attached to both the mold clamping plates 12 and 22 are connected to the inner mold mounting plates 13 and 23. Do it.

  The mold clamping cylinder 15 is a piston single-acting type that operates only in the mold closing direction. The mold clamping cylinder 25 is a piston double-acting type that operates in both the mold closing and mold opening directions. In addition, a plurality of mold clamping cylinders 25 are fixed to the surface of the mold clamping machine 22 in parallel with a predetermined interval. Simultaneous operation of both mold clamping cylinders 15 and 25 causes two sets of mold clamping mechanisms 1 and 2 to simultaneously perform mold closing and clamping operations. When the mold is opened, only the clamping cylinder 25 operates and the clamping cylinder 15 does not operate. It is like that.

  Reference numerals 3 and 4 denote two sets of link mechanisms having the same structure on the upper surface of the base plate 10. The cam followers rotate each pair of parallel link plates 31 a, 31 b, 41 a, 41 b around the support shaft between the plates. The guide pins 31a ', 31b', 41a ', 41b' on the plate are fitted into the long holes 30 ', 40' on both sides in the plane of the 30, 40, respectively, and are alternately movably connected. In such a configuration, each pair of link plates is associated with each other by the cam followers 30 and 40, and the relative movement amount of both plates is always regulated to the same dimension.

  The two sets of link mechanisms 3 and 4 are movably arranged in parallel by placing rolling guide members 5a and 5a on the lower surface of the link plate on four guide rails 5 and 5 for the link laid on the upper surface in the base plate. The two mold clamping mechanisms 1 and 2 connected to the link mechanisms 3 and 4 are movably installed on the base plate 10 with the outer mold mounting plates 11 and 21 back to back with a mold opening space. It is.

  As shown in FIG. 5, the mold clamping mechanisms 1 and 2 and the link mechanisms 3 and 4 are connected to each other between the mold clamping machine 12 and the outer mold mounting plate 11 of one mold clamping mechanism 1 and the other mold clamping mechanism 2. The inner mold attachment plate 23 is connected to the same link plates 31a and 41a outside the link mechanisms 1 and 2, the inner mold attachment plate 13 of one mold clamping mechanism 1, the mold clamping plate 22 of the other mold clamping mechanism 2, and the like. The outer mold mounting plate 21 is connected to the same inner link plates 31b and 41b.

  Further, the mold clamping mechanisms 1 and 2 and the link plates 31a, 31b, 41a and 41b are connected to each other at the required height of a short columnar receiving piece 7 having a pin hole vertically formed on the plate at each connection location. 7 is fixed, and each pin of the mold clamping mechanism and a pin protruding from the lower end of each board are inserted into the pin holes, and each board and each board are placed on the receiving pieces 7, 7 Yes. For installation on the platform, the recesses formed outwardly at the lower ends of both sides of the mold clamping plate and the mold mounting plate are fitted to the guide rails 6 and 6 installed horizontally on both edges of the platform. The fitting between the recess and the guide rails 6 and 6 prevents the mold clamping mechanisms 1 and 2 from being detached from the link mechanisms 3 and 4 and the base plate 10.

  The illustrated mold clamping device is for blow molding, and the molds 8 and 8 are separately mounted on the opposing surfaces of the inner and outer mold mounting plates for each of the mold clamping mechanisms 1 and 2, and the molds 8 and 8 are parted. Preforms 9 are positioned on the line so as to be movable up and down.

  In the above configuration, when the plungers 15a and 25a of the clamping cylinders 15 and 25 of both the mold clamping mechanisms 1 and 2 are extended in the mold open state shown in FIG. 5A, both the mold clamping mechanisms 1 and 2 are linked. Even if connected to the mechanisms 3 and 4, since the base plate 10 is movably installed by the guide rail 5 and the rolling guide member 5a, both the mold clamping machines are accompanied by the extension of the plungers 15a and 25a. 12 and 22 are pulled outward, and the inner mold mounting plates 13 and 23 are pulled inward and pulled apart in opposite directions.

  In the mold clamping mechanism 1 on the left side of the drawing, the mold clamping machine 12 is connected to the outer link plates 31a and 41a of the link mechanisms 3 and 4, and the link plates 31a and 41a are connected to the outer mold attachment plate 21 and the other. Since the inner mold mounting plate 23 of the mold clamping mechanism 2 is connected, both of them move simultaneously in the same direction as the mold clamping machine 12.

  The inner mold attachment plate 13 is connected to the inner link plates 31b and 41b of the link mechanisms 3 and 4, and the link plates 31b and 41b are connected to the outer mold attachment plate 21 and the mold clamping of the other mold clamping mechanism 2. Since the boards 22 are connected, both of them move simultaneously in the same direction as the inner mold mounting plate 13.

  In the mold clamping mechanism 2 on the right side of the drawing, the mold clamping machine 22 is connected to the link plates 31b and 41b inside the link mechanisms 3 and 4, and the link plates 31b and 41b are connected to the outer mold attachment plate 21 and the other. Since the inner mold mounting plate 13 of the mold clamping mechanism 1 is connected, both of them move simultaneously in the same direction as the mold clamping machine 22.

  The inner mold mounting plate 23 is connected to the outer link plates 31a and 41a of both link mechanisms 3 and 4, and the outer mold mounting plate 11 and the mold clamping plate of the other mold clamping mechanism 1 are connected to the link plates 31a and 41a. Since 12 are connected, both of them simultaneously move in the same direction as the inner mold mounting plate 23.

  Thereby, the moving direction between the inner and outer mold mounting plates in both mold clamping mechanisms 1 and 2 becomes the closing direction, and the mold is closed as shown in FIG. Further, the mutual movement of the link plates by the simultaneous operation of both the mold clamping cylinders 15 and 25 is synchronized by the cam followers 30 and 40 across both plates, so that the molds are simultaneously closed on the parting line. This mold closing is performed after the preforms 9 and 9 are lowered and positioned between the molds, and then mold clamping by both mold clamping cylinders 15 and 25 and blow molding by air blow into the preform are performed. .

  In the mold opening shown in FIG. 5A, the piston double-acting mold clamping cylinder 25 of the mold clamping mechanism 2 is operated in the plunger contracting direction. Since the mold opening force can be performed with a pressure smaller than the mold clamping force, it is not necessary to operate the mold clamping cylinder 15 and energy is saved. At this time, even if the plunger 15a of the mold clamping cylinder 15 is connected to the inner mold mounting plate 13, the plunger 15a is in a free state, so that the inner mold mounting plate 13 does not move and is smoothly pulled out from the cylinder. Go.

  When the mold clamping cylinder 25 is contracted, the mold clamping plate 25 and the inner mold mounting plate 23 are attracted to each other to narrow the interval, thereby causing the pair of inner and outer link plates 31a, 31b and 41a, 41b to oppose each other. At the same time, the distance between the mold clamping plate 15 and the inner mold mounting plate 13 is narrowed, and the movement of the link plate is synchronized by the cam followers 30 and 40. There is no timing shift, and the inner and outer mold mounting plates are simultaneously opened to release the molded product. Due to this synchronization, the molded product does not stick to the side of the split mold that is delayed to open, resulting in defective molding, and in the heat set mold, partial shrinkage of the molded product due to sticking of the molded product is prevented.

  In the illustrated embodiment, a single-acting piston type that operates only in the mold opening direction is employed for one of the clamping cylinders 15. The clamping cylinder is the same piston double-acting type as the other clamping cylinder 25. There may be.

1 and 2 Mold clamping mechanism 3 and 4 Link mechanism 5 Link guide rail 6 Guide rail on base plate 7 Receiving piece 8 Mold 10 Base 11 and 21 Outer mold mounting plates 12 and 22 Mold clamps 13 and 23 Inner mold Mounting plates 14, 24 Tie bars 15, 25 Clamping cylinders 15a, 25a Plungers 30, 40 Cam followers 31a, 41a Outer link plates 31b, 41b Inner link plates

Claims (4)

Connect the outer mold mounting plate of the pair of mold mounting plates facing each other and the mold clamping machine equipped with the clamping cylinder with a tie bar inserted through the inner mold mounting plate, and connect the plunger to the inner mold mounting plate. In the mold clamping device in which two mold clamping mechanisms are configured, both mold clamping machines are facing outwards, the outer mold mounting plates are back to back, and a mold opening space is opened to move freely on the base plate.
On the upper surface of the base plate, a link mechanism is constructed in which a pair of parallel link plates are connected by a cam follower that rotates about a support shaft between the plates so as to be movable alternately. The mold clamping mechanism
The mold clamping plate and outer mold mounting plate of one mold clamping mechanism and the inner mold mounting plate of the other mold clamping mechanism are connected to the same link plate on one side,
An inner mold mounting plate of one mold clamping mechanism and a mold clamping plate and an outer mold mounting plate of the other mold clamping mechanism are connected to the same link plate on the other side,
A mold clamping device comprising two sets of mold clamping mechanisms, wherein the mold opening and closing operations of the two sets of mold clamping mechanisms are synchronized.   Each of the mold clamping mechanisms includes a plurality of mold clamping cylinders that are fixed in parallel to the surface of the mold clamping machine, and the mold clamping cylinder of one of the mold clamping mechanisms is a single-acting piston that operates in the mold opening direction. 2. The mold clamping apparatus having two sets of mold clamping mechanisms according to claim 1, wherein the mold clamping cylinder of the other mold clamping machine is composed of a double-acting piston type that operates in both directions of mold opening and mold closing.   The above two sets of mold clamping mechanisms have outward recesses at the lower ends of both sides of the mold clamping plate and the mold mounting plate, and these recesses fit into guide rails that are installed on both edges of the machine base. 2. The mold clamping device having two sets of mold clamping mechanisms according to claim 1, wherein the mold clamping mechanisms are movably installed. Two sets of the link mechanisms are arranged side by side on the base plate, and the two sets of mold clamping mechanisms are provided on both of the link mechanisms.
The mold clamping plate and outer mold mounting plate of one mold clamping mechanism and the inner mold mounting plate of the other mold clamping mechanism are connected to the same link plate at the same position of both link mechanisms,
An inner mold mounting plate of one mold clamping mechanism and a mold clamping plate and an outer mold mounting plate of the other mold clamping mechanism are connected to the same link plate at other positions of both link mechanisms,
2. The mold clamping apparatus having two sets of mold clamping mechanisms according to claim 1, wherein the mold opening and closing operations of the two sets of mold clamping mechanisms are synchronized by the two sets of link mechanisms.

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