JPS6237699Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vertical injection molding machine that can improve mass productivity.

Conventionally, in injection molding, there is a method of molding using two or more sets of molds for one injection machine in order to shorten the molding cycle time, but in the conventional method, one mold is After injecting molten resin into the mold with the mold clamped by the mold clamping device, the resin in the mold is cooled and solidified while the mold is kept in the clamped state at the injection position, until the resin solidifies to some extent. Afterwards, the mold clamp was released and the mold was moved to the molded product removal position. Therefore, the mold must be kept in a closed state for a long period of time at the injection position, from the injection of the molten resin until it is cooled and solidified, that is, molded, making it difficult to significantly shorten the molding cycle time. .

As an improvement over the above conventional method, the movable table is equipped with a mold opening/closing device, the mold is clamped by the mold clamping device at the injection position, the molten resin is injected into the mold, and then the mold is closed. There is a device in which the mold is kept in a clamped state by the mold opening/closing device and moved to a molded product take-out position, and at the molded product take-out position, the mold is opened by the mold opening/closing device to take out the molded product. ,
In this case, the mold opening/closing device requires a large device to open and close the mold, and if the moving table is equipped with such a large mold opening/closing device, the moving table will also be large and it will be difficult to move it. Since the driving means is also large-sized, there is a problem in that the entire device becomes bulky and equipment costs are high.

The present invention solves these problems by providing molding stations on both the left and right sides of the injection station, setting two sets of molds on a trolley, and carrying them alternately between the injection station and either the left or right molding station. The injection station injects the molten resin into the mold and the molding station cools and solidifies the molten resin in the mold, that is, molding can be performed simultaneously, greatly shortening the molding cycle time. In addition, by providing a mold opening/closing mechanism and an ejector mechanism in the molding station, the mold clamping and holding means installed on the trolley can be made smaller and lighter, and the traveling drive source of the trolley can be made smaller and more compact. The station is designed to efficiently and accurately perform the steps from cooling and solidifying to taking out the molded product.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A indicates an injection station, B and B' indicate molding stations, and the injection station A includes a mold clamping stationary plate 10, a mold clamping cylinder 13 supported via a plurality of tie rods 11 and a support plate 12,
A mold clamping movable platen 15 connected to the ram 14 of the mold clamping cylinder 13 to move up and down is provided, and an injection device 20 is provided behind it. 21 is hopper, 2
2 is a cylinder barrel, 23 is an injection nozzle, 24 is an injection hydraulic cylinder, and 25 is a hydraulic motor for driving the rotation of the injection screw.

Further, the stationary platen 10 is provided with a running rail 16 for the truck 40 and a truck tightening device 30.
As shown in FIG. 4, the truck tightening device 30
It consists of a clamping metal fitting 31 that removably engages with a locking part 41 provided at 0, a guide member 32 of the metal fitting, a tightening cylinder 33, and a return spring 34.

The trolley 40 has a plurality of running wheels 42 and a running drive motor 43, and is provided so as to be able to reciprocate left and right astride the injection station A and the molding station B or B'. The upper die mounting plates 44, 44' are provided so as to be freely raised and lowered by a plurality of lifting cylinders 45, 45', respectively.

On the other hand, the molding stations B and B' are provided with fixed plates 50 and 50' for opening and closing the mold, respectively equipped with running rails 57 and 57' of the trolley 40, a plurality of tie rods 51 and 51', and support plates 52 and 52. Movable mold opening/closing plates 53, 5 supported in a vertically movable manner through
3', and a plurality of mold opening/closing cylinders 54, 54' for raising and lowering the movable plates 53, 53'. Ekta cylinder 62,6
2', ejector mechanisms 60, 60' consisting of ejector plates 63, 63', and clamp fittings 55, 55' for upper mold mounting plates 44, 44' are provided at the lower part. Reference numerals 56 and 56' indicate lower limit stoppers of the movable plates 53 and 53'.

Reference numerals 70 and 70' designate fall prevention devices, which, as shown in FIG. , a guide member 74, a bracket 75 fixed to the movable platen 54, 54', and a hole 76 provided in the bracket.
By engaging the pin 73 with the hole 76, the movable plates 53, 53' are prevented from falling. 58 is each fixed plate 50,1
The rails 59 and 59' provided between the rails 57, 16 and 57' at 0 and 50' are mold exchange tables.

Next, the operation will be explained.

First, each lower mold 81 of two sets of molds 80, 80',
81' is fixed on the carriage 40, and each upper die 82, 82' is fixed on the upper die mounting plate 44, 44' by appropriate fixing means (not shown). In addition, this mold 8
The installation of molds 0 and 80' can be carried out efficiently by transporting each mold mounting position of the carriage 40 to the molding station B or B' and using the mold exchange tables 59 and 59'.

Next, the upper mold mounting plates 44, 44' and the upper molds 82, 82' are lowered by the respective lifting cylinders 45, 45', and the traveling drive motor 43 is driven with the molds 80, 80' closed. , the trolley 40 is moved to the right. The trolley 40 travels to a predetermined position, and one mold 80 is carried into the injection station A.
When the other mold 80' is carried into the molding station B, a detector (not shown) such as a limit switch is activated, the carriage 40 is stopped, and the tightening cylinder 33 of the tightening device 30 is activated. , the clamping fitting 31 engages with the locking part 41 of the truck 40, and the truck 4
0 is fixed.

After that, at the injection station A, the mold clamping cylinder 13 is activated to lower the ram 14 and the mold clamping movable platen 15, and after the mold 80 is clamped,
The injection nozzle 23 of the injection device 20 advances and the mold 8
0, and molten resin is injected into the mold 80. When this injection is completed, the injection nozzle 23 retreats and leaves the mold 80, and the mold clamping cylinder 1
The ram 14 of No. 3 rises, the mold clamping movable platen 15 rises, and mold clamping is released. However, even if this mold clamping is released, the mold 80 is held in the closed position by the lifting cylinder 45 provided on the truck 40, the upper mold mounting plate 44, and the like.

Next, the mold 8 at the injection station A
When the mold clamping release to 0 is completed, the clamping of the truck 40 by the tightening device 30 is released, the travel drive motor 43 is driven, and the truck 40 travels to the left.
Then, when the trolley 40 travels to a predetermined position and the mold 80 is carried into the molding station B, and the other mold 80' is carried into the injection station A, a detector such as a limit switch (see FIG. (not shown) stops the truck 40, and the truck 40 is fixed again by the tightening device 30. Further, as the mold 80 is carried in, the flange portion 44a of the upper mold mounting board 44 of the mold 80 is engaged with the clamp fitting 55 and clamped.

Next, at molding station B, the mold 8
0 is held in the closed position by the lifting cylinder 45 and the upper mold mounting plate 44, etc., and the mold 80
Cooling water is supplied to the mold 80, and the resin in the mold 80 is cooled and solidified for a predetermined period of time to be molded into a predetermined shape. After that, the mold opening/closing cylinder 54 and the lifting cylinder 45 are operated, and the mold opening/closing movable platen 53, the upper mold mounting plate 44, and the upper mold 82 are raised, and the mold 80 is raised.
is opened, the ejector cylinder 62 of the ejector mechanism 60 is operated, and the molded product is transferred to the mold 80.
taken from.

Meanwhile, at the molding station B, while the resin in the mold 80 is being cooled and solidified and the molded product is being taken out, at the injection station A, the other mold 80' is being moved to the mold clamping cylinder in the same manner as described above. The mold is clamped by the ram 14 of 13 and movable mold clamping platen 15, etc., and the injection nozzle 23 moves forward to close the mold 8.
The molten resin is injected at 0', and when the injection is finished,
The injection nozzle 23 retreats and separates from the mold 80', the ram 14 of the mold clamping cylinder 13 rises, and the mold clamping on the mold 80' is released.

Next, the fixation of the carriage 40 by the tightening device 30 is released again, the carriage 40 is moved to the right, the mold 80' is carried into the molding station B', and the mold 80 is transferred to the injection station A. The cart 40 is carried in and fixed by the tightening device 30.
Then, at the molding station B', the resin in the mold 80' is cooled and solidified by the same operation as described above, and then the mold 80' is opened by the operation of the mold opening/closing cylinder 54', the lifting cylinder 45', etc. he,
The molded product is ejected by the ejector mechanism 60', and during this time, at the injection station A, the mold 80 from which the molded product was previously ejected is
The mold is clamped again, molten resin is injected, and the mold clamp is released.
Thereafter, the above operation is repeated.

In this way, the trolley 40 is reciprocated left and right, and one mold 80 is alternately carried into the injection station A and the molding station B, while the other mold 80
0' to molding station B' and injection station A.
At injection station A,
One of the molds 80 or 80' is clamped, the molten resin is injected, and the mold clamp is released, and during this time the resin in the other mold 80' or 80 is cooled and solidified, and the molded product is taken out. This allows the tasks to overlap in time.

Moreover, by holding the molds 80, 80' in the closed position by the lifting cylinders 54, 54', the upper mold mounting plates 44, 44', etc., the molds 80, 80'
Even if the mold clamp is released immediately after injecting the molten resin into the molds 80, 80', the resin in the molds 80, 80' will not leak and the molds 80, 80' can be transferred from the injection station A to the molding station B, B' can be moved without any trouble, and the time the mold is stopped at injection station A can be shortened.

Furthermore, at the molding stations B and B', the resin in the molds is cooled and solidified while the molds 80 and 80' are held in the closed position as described above, so that the resin is properly cooled and solidified without causing distortion. can. In addition, the upper die mounting plates 44, 44' on which the upper dies 82, 82' are attached are connected to the movable plates 53, 53' for opening and closing the molds using clamp fittings 55, 55', and the movable plates 53, 53' are connected to the tie rods. 51, 51', so that the molds 80, 80' can be smoothly opened and closed by the operation of the mold opening/closing cylinders 54, 54' and the lifting/lowering cylinders 45, 45', and the ejector mechanism The molded product can be accurately and efficiently taken out from the molds 80, 80' by the molding stations B, 60', and a high quality molded product can be obtained.
The stop time of the mold 80' can be shortened, and the molding cycle time can be greatly shortened due to the mutual effect of the above-mentioned operation overlap and the shortening of the stop time of the mold at the injection station A.

Further, since no injection pressure is applied when the mold is moved, the output of the lifting cylinders 45, 45' as means for maintaining the closed posture of the molds 80, 80' may be small, and this means for maintaining the closed posture of the molds It can be made smaller and lighter, and the trolley 40 can also be made smaller and lighter, which can contribute to a reduction in equipment costs.

As explained above, according to the present invention, it is possible to carry two sets of molds into the injection station and the molding station alternately, so that each operation overlaps, and the stopping time of the molds at each station can be reduced. The molding cycle time can be greatly reduced. Moreover, a high-quality molded product can be obtained, and the cart can be made smaller and lighter, contributing to a reduction in equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view of the same, Fig. 4 is an enlarged sectional view of the bogie tightening device, and Fig. 5 is a mold drop. FIG. 3 is a partial cross-sectional view of the prevention device. A... Injection station, B, B'... Molding station, 10... Mold clamping stationary plate, 13... Mold clamping cylinder, 14... Ram, 20... Injection device, 3
0... Bogie tightening device, 40... Bogie, 42... Traveling wheel, 43... Bogie drive motor, 44, 4
4'... Upper mold mounting board, 45, 45'... Lifting cylinder, 50, 50'... Fixed plate for mold opening/closing, 60,
60'... Ejector mechanism, 70, 70'... Mold drop prevention device, 80, 80'... Mold.

Claims (1)

[Scope of utility model registration request] The injection station is equipped with an injection device, a fixed platen for mold clamping, and a movable platen for mold clamping that is raised and lowered by the mold clamping mechanism.Fixed plates for opening and closing the mold and a movable platen for opening and closing the mold, respectively, are installed on both sides of the injection station. A molding station is equipped with a movable platen for opening and closing the mold that can be raised and lowered.
A carriage that reciprocates between the injection station and the left and right molding stations is provided with a traveling mechanism, a pair of upper mold mounting plates that can be raised and lowered, and a holding means for holding each upper mold mounting plate in a mold closed position. each of the lower molds of the two sets of molds is placed on the trolley, each upper mold is attached to the upper mold mounting plate, and each of the mold opening/closing movable plates of each of the molding stations is placed. A vertical injection molding machine characterized by being provided with a connecting means for connecting an upper die mounting plate and an ejector mechanism.