JPH0478450B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a twin-screw injection molding machine that can perform single molding, twin molding, sandwich molding, etc. with one molding machine.

[Prior Art] Conventionally, two types of molten synthetic resins were sequentially applied into a mold having one gate port which was equipped with two sets of injection units and which were clamped by one mold clamping device. A two-color injection molding machine or two sets of injection units are combined with a T-shaped nozzle to inject two types of molten plastic into a mold with one gate port that is clamped by one mold clamping device. A two-screw injection molding machine is known that can perform sandwich molding and hollow molding in which the two sets of injection units simultaneously perform injection.

[Problem to be solved by the invention]

The above-mentioned conventional technologies were all developed as special-purpose machines, and it is not possible to perform the various types of molding described above with a single molding machine. Therefore, when performing various types of molding, it is necessary to install several molding machines. There was a problem in that the equipment cost would increase.

The present invention has been made in view of the problems of the above-mentioned conventional technology, and although twin molding is performed in a mold having two gate openings on the left and right using two sets of injection units, it is possible to It is possible to carry out single molding using one injection unit in a mold with two gate openings, and also to perform sandwich molding by connecting T-shaped nozzles to the two sets of injection units. The purpose is to provide an axial injection molding machine.

[Means to solve the problem]

In order to achieve the above object, the multifunctional two-axis injection molding machine of the present invention has three nozzle insertion holes formed in a horizontal line at equal intervals in a fixed plate of a mold clamping device, and arranged opposite to the fixed plate. Two swivel tables, which are longer than the support pedestals, are provided in parallel with each other on the lateral movement device, and two sets of injection units are slidably disposed on the swivel pedestals. Further, the lateral movement device is arranged such that the two sets of injection units both face two left and right nozzle insertion holes of the noise insertion hole, and one of the injection units is placed in the center nozzle insertion hole. The injection unit is provided with a drive means and a stopper mechanism for moving the injection units to opposing positions, and each of the two sets of injection units has a nozzle connection portion which is replaceable with a nozzle for single molding and a T-shaped nozzle for sandwich molding.

Moreover, it is effective if the support stand is a turning plate pivotably mounted on the lateral movement device.

[Effect]

At each nozzle connection part of the above two sets of injection units,
A nozzle for single molding is attached to each, and the driving means of the lateral moving device is activated to move the two sets of injection units to a position where they both face the two left and right nozzle insertion holes, and to that position by a stopper mechanism. make it stop. Next, the two sets of injection units are slid on the rotating table toward the fixed plate, and each single molding nozzle is inserted into the two nozzle insertion holes on the left and right to form a mold having two gate openings on the left and right. Either perform twin molding, or slide only one of the injection units on the swivel table toward the fixed platen, insert the single molding nozzle of that injection unit into the opposing nozzle insertion hole, and then Single molding is performed in a mold that has one gate opening that corresponds to the nozzle insertion hole, and the lateral movement device is moved by its driving means to a position where one of the two injection units faces the center nozzle insertion hole. The mold is moved to a position and stopped at that position by a stopper mechanism, and single molding is performed in a mold having one gate opening using one injection unit.

On the other hand, to install a long T-shaped nozzle for sandwich molding, slide the two injection units on a long swivel table in the direction away from the fixed plate to create a large gap between them and the fixed plate. Attach a T-shaped nozzle for sandwich molding to the nozzle connection part of the injection unit, and place it opposite to each nozzle insertion port (hereinafter referred to as "used nozzle insertion port") of the stationary plate, which corresponds to the position of the gate port of the mold. Move the lateral movement device to the same position as when installing the nozzle for single molding described above, so that the tip of the T-shaped nozzle for sandwich molding faces the nozzle insertion port to be used,
It is stopped at that position by the stopper mechanism. Next, the two sets of injection units are both slid on the swivel table toward the fixed plate, and the T-shaped nozzle for sandwich molding is inserted into the nozzle insertion port to perform sandwich molding, blow molding, or foam molding.

[Example] Embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, reference numeral 5 denotes a fixed platen for a mold clamping device (not shown) provided on the left side (hereinafter referred to as the "front") of the bed 1 of the injection molding machine; A front guide groove 8 and a rear guide groove 8' extending parallel to each other in the width direction of the bed 1 are formed on the bed 1 on the right side (hereinafter referred to as "rear") of the bed 5 in the drawing. The front slide base 7 is slidably fitted into the front guide groove 8, and the rear slide base 7' is slidably fitted into the rear guide groove 8'. Then, the rotating plate 2 is disposed. and,
The swing plate 2 is pivotally mounted by a swing pin 6 protruding from the rear slide table 7', and is configured to be able to swing freely around the previous swing pin 6 by activation of a hydraulic cylinder 15 provided at an appropriate location. Furthermore, the rotating plate 2
On the top, there are two swivel tables 3a longer than the swivel plates 2,
3b are fixed in parallel to each other, and a first injection unit 4a is mounted on one swivel base 3a, and a second injection unit 4b is slid back and forth on the other swivel base 3b by an appropriate means such as a hydraulic cylinder (not shown). It is set up freely.

Further, in this embodiment, the driving means of the lateral movement device is configured as follows.

The front slide table 7 and the rear slide table 7' have ball screw holes 7a and 7b, respectively (see Figure 3).
A front or rear ball screw 9, 9' is screwed into each ball screw hole 7a, 7b, respectively. At the free ends of these front and rear ball screws 9, 9', bevel gears 13,
13' is provided, and the support frame 1 extends from the bed 1.
Two bevel gears 12, 12' are provided on a rotating shaft 11 that is directly connected to a lateral movement motor 10 supported at 8.
are interlocked with each other. As a result, when the motor 10 is started, the front and rear ball screws 9, 9' rotate synchronously, and the front slide table 7 and the rear slide table 7' rotate at the same speed in the front guide groove 8 or the rear guide groove, respectively. 8'
, and moves in parallel in the width direction of the bed 1. In this case, the motor 10 is capable of forward and reverse rotation, and by rotating forward or reverse, the motor 10 rotates the front and rear ball screws 9, 9' in the forward or reverse direction. ' is moved back and forth in parallel at the same speed in the bed width direction (hereinafter referred to as ``lateral movement'').
A rotary encoder 20 is provided at the other end of the rotating shaft 11 to control the motor 10. Therefore, as the front slide table 7 and the rear slide table 7' move laterally, the first injection unit 4a and the second injection unit 4b move laterally with respect to the fixed platen 5.

As shown in detail in FIG. 3, a plurality of rear slides 1 are provided on the upper surface of the rear slide 7' so that the swivel plate 2 can turn smoothly.
4' is buried. On the other hand, a plurality of front slides 14 are provided on the lower front surface of the swing plate 2 at positions where they slide on the bed 1, and a slide rail 19 is provided on the bed 1 facing the front slides 14 to allow the swing plate 2 to rotate. It is designed to increase stability over time.

In addition, FIG. 4 shows the rotation axis 1 of the front slide table 7.
It shows a stopper mechanism provided at the end of the first side, including a stopper 17 that moves up and down by an air cylinder 16, and three holders provided at three locations corresponding to each molding position described later on the bottom of the front guide groove 8. 21 (only one of which is shown in FIG. 4), and starts the air cylinder 16 to lower the clasp 17 and engage the three holders 21, respectively. Accordingly, the lateral movement device is positioned at the twin molding position and two single molding positions on both sides thereof.

In the above-described embodiment, the lateral movement device includes a front slide base 7 loosely fitted into a front guide groove 8 and a rear guide groove 8' provided on the bed 1, respectively.
In addition, a rotating plate 2 serving as a support base is pivotally attached to the rear sliding base 7' by a pivot pin 6. However, the lateral movement device is not limited to the above-mentioned one, and the support base is also replaced by a support plate (not shown) that spans the front slide base 7 and the rear slide base 7' and is fixed to both. It may be composed of

Next, a description will be given of the lateral movement of the lateral movement device between the twin molding position and the single molding positions on both sides of the twin molding position using the injection molding machine of the present invention.

As shown in FIG. 7, in the biaxial injection molding machine of the present invention, the first injection unit 4a and the second injection unit 4b are both opposed to two nozzle insertion holes 5a and 5c on both sides of the fixed platen 5. a twin molding position, two single molding positions on both sides of the twin molding position, that is, a position where the first injection unit 4a faces the central nozzle insertion hole 5b, and a position where the second injection unit 4b faces the central nozzle insertion hole 5b. It is laterally moved to three positions facing each other, and is positioned by the stopper mechanism at the front three molding positions.

Note that the stopper 16 for positioning described above
For example, the position of the second injection unit 4b may be detected by a limit switch or rotary encoder 20 (not shown), and the air cylinder 16 may be activated based on this detection signal. Furthermore, if the motor 10 for traversing is equipped with a brake, it will not rotate when it stops, so the front and rear ball screws 9, 9' will also not rotate, and together with the setting of the stopper mechanism, each injection unit will not rotate. 4a and 4b can be moved to and stopped from each molding position more reliably.

On the other hand, FIGS. 5 and 6 show both the nozzles 1
1a and 11b, and slide the first injection unit 4a and the second injection unit 4b on the swivel bases 3a and 3b, respectively, in the direction opposite to the fixed platen so that there is a sufficient distance between them and the fixed platen 5. The T-shaped nozzle 30 for sandwich molding is shown attached.

Next, to explain the operation in this case, the movement of the lateral movement device is performed in the same way as when the above-mentioned single molding nozzles 11a and 11b are attached, but the sandwich molding mold has only one gate opening. Therefore, the tip of the T-shaped nozzle 30 for sandwich molding is opposed to one of the nozzle insertion ports corresponding to the gate opening, that is, the nozzle insertion port in use, and stopped at that position by the stopper mechanism. Next, two sets of injection units 4a, 4b
Both are slid toward the fixed plate on the rotating tables 3a and 3b, and the T-shaped nozzle 30 for sandwich forming is inserted into the nozzle insertion opening to perform sandwich forming.

〔Effect of the invention〕

Since the present invention is configured as described above,
This produces the effects described below.

In the twin-screw injection molding machine according to claim 1, by installing a nozzle for single molding, twin molding can be performed with twin molding molds, but single molding can be performed using either one of the injection units, Molding similar to normal single injection molding can be performed using a conventional single mold.
Also, attach a T-shaped nozzle for sandwich molding, and use any one of the three nozzle insertion ports on the fixed plate that corresponds to the position of one gate opening of the sandwich molding mold. As an insertion port, various types of molding such as sandwich molding can be performed with one machine, and equipment costs can be significantly reduced.

In addition to the above-mentioned effects, the biaxial injection molding machine according to claim 2 can finely adjust the alignment between the nozzle of each injection unit and the nozzle insertion hole of the fixed plate by rotating the swivel table at each molding position. can be done.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view of an injection molding machine of the present invention equipped with a nozzle for biaxial twin molding or uniaxial single molding, Fig. 2 is a side view thereof, and Fig. 3 is a FIG. 4 is an enlarged exploded perspective view of the stopper mechanism, and FIG. 5 shows an injection molding machine of the present invention equipped with a T-shaped nozzle for sandwich molding. FIG. 6 is a partially cutaway plan view, FIG. 6 is a side view thereof, and FIG. 7 is a schematic plan view showing the positions of nozzles for each type of molding of the present invention. 1...Bed, 2...Swivel plate, 3a, 3b...
Swivel base, 4a...first injection unit, 4b...second injection unit, 4a', 4b'...connection section, 5...
Fixed plate, 5a, 5b, 5c... Nozzle insertion hole, 6
...Swivel pin, 7...Front slide base, 7'...
Rear slide base, 8...Front guide groove, 8'...
Rear slide groove, 9...Front ball screw, 9'...
... Rear ball screw, 10 ... Motor, 11 ... Rotating shaft, 11a, 11b ... Nozzle, 12, 12',
13, 13'...Bevel gear, 14...Front slide shoe, 14'...Rear slide shoe, 15...
...Fluid pressure cylinder, 16...Air cylinder, 17
... Clasp, 18 ... Support frame, 19 ... Slide rail, 20 ... Rotary encoder, 21 ... Receiver, 30 ... T-shaped nozzle.

Claims (1)

[Scope of Claims] 1. Three nozzle insertion holes 5a, 5b, 5c are formed in a horizontal row at equal intervals in a fixed platen 5 of the mold clamping device, and a horizontally movable nozzle is arranged opposite to the fixed platen 5. on the device,
Two swivel stands 3a and 3b, which are longer than the support stand, are provided in parallel with each other via a support stand, and the swivel stand 3
Two sets of injection units 4a, 4b are slidably disposed in the noise insertion holes 5a, 3b, respectively, and the lateral movement device is arranged such that the two sets of injection units 4a, 4b are arranged inside the noise insertion holes 5a, 5b, 5c. , and a driving means and a stopper mechanism for moving one of the injection units 4a, 4b to a position facing the nozzle insertion hole 5b in the center, and The two sets of injection units 4a and 4b are multi-functional twin-screw injection molding machines having nozzle connections 4a' and 4b' which are replaceable with nozzles 11a and 11b for single molding and a T-shaped nozzle 30 for sandwich molding, respectively. 2. The multifunctional biaxial injection molding machine according to claim 1, wherein the support base is a pivot plate 2 pivotably mounted on the lateral movement device.