JPH057171B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has two sets of injection devices, clamps two sets of molds at the same time, and injects different types of resin, etc. into each mold. This invention relates to an injection molding machine that can perform molding.

[Prior Art] As this type of injection molding machine, the one shown in Fig. 5 is known (for example, the one shown in
Publication No.).

That is, a support plate 2 is fixed on the bed 1, and tie bars 3 are connected to the four corners of the support plate 2. Further, a mold clamping board 4 is provided on the bed 1 so as to be movable in the direction of approaching and separating from the support board 2, and at the four corners of this mold clamping board 4,
a piston 3a formed at one end of the tie bar 3;
A mold clamping cylinder hole 4a into which the mold is inserted is formed. A movable plate 5 and a rotary plate 6 are provided on the tie bar 3 between the support plate 2 and the mold clamping plate 4 so as to be movable in the axial direction of the tie bar 3. 5 and a movable plate moving cylinder 7 connected to the support plate 2, and the rotary plate 6 is moved by a rotary plate moving cylinder 8 connected to the rotary plate 6 and the mold clamping plate 4. It is becoming driven. Further, the movable platen 5 is provided with a lock member 9 that engages with a notch 3b formed in the tie bar 3.

In addition, injection devices 10 are provided on the outside of the support plate 2 and the mold clamping plate 4 so as to face each other, and this injection device 10 includes a heating cylinder 11,
It is equipped with a screw 12 inserted into the heating cylinder 11, and a screw driving means 13 for driving the screw 12 in the axial direction and rotational direction.
The screw driving means 13 includes an injection hydraulic cylinder 14 which is located axially rearward of the heating cylinder 11 and moves the screw 12 in the axial direction, and an injection hydraulic cylinder 14 which is located axially rearward of the injection hydraulic cylinder 14 and which moves the screw 12 in the axial direction.
2 and a hydraulic motor 15 that rotationally drives the motor. Each of the injection devices 10 is connected to the support plate 2 or the mold clamping plate 4 via a cylinder 16 for moving the injection device.

In addition, in the figure, K1 is the first mold held by the mold clamping board 4 and the rotary disc 6, and K2 is the second mold held by the movable board 5 and the rotary disc 6.

In the injection molding machine configured as described above, by extending the rod of the movable plate moving cylinder 7 and contracting the rod of the rotary plate moving cylinder 8, the rotating plate 6 is moved toward the mold clamping plate 4 side. Along with the movement, the movable plate 5 moves toward the rotary plate 6, and the first mold K1 and the second mold K2 are brought into a closed state. At this time, the injection device 10 connected to the movable platen 5 moves together with the movable platen 5, and the heating cylinder 11 comes to protrude from the insertion hole 2a formed in the support platen 2 toward the movable platen 5 side. in this way,
With the first mold K1 and the second mold K2 closed, the lock member 9 provided on the movable platen 5 is engaged with the notch 3b of the tie bar 3, and then the tie bar 3 of the mold clamping cylinder hole 4a When pressure oil is supplied to the side, the mold clamping plate 4 moves to the movable platen 5 side, and the first mold K1 and the second mold K2 are brought into a clamped state. Next, pressure oil is supplied to each injection device moving cylinder 16 to move each injection device 10 to the first mold K1 or second mold K2 side, thereby moving the heating cylinder 11 of each injection device 10. Press the tip of the into each mold,
Each heating cylinder 11 is operated by operating the screw driving means 13.
The resin inside is injected into each mold.

After the resin in each mold is cooled and solidified, the pressure of the pressure oil in the mold clamping cylinder hole 4a is released to release the mold clamping force, and the locking member 9 is inserted into the notch 3b of the tie bar 3.
Remove from. After that, the rod of the movable plate moving cylinder 7 is retracted, and the rotary plate moving cylinder 8 is
extend the rod, move the rotary plate 6 and the movable plate 5 to the support plate 2 side, and remove the first mold K1 and the second mold K1.
The mold K2 is opened. As a result, the molded product cooled and solidified in each mold is taken out.

[Problem to be solved by the invention] However, in the above conventional injection molding machine,
Since the rotary disk 6 moves toward the mold clamping disk 4 when the mold is closed, the moving distance of the movable disk 5 is approximately twice that of the rotating disk 6. Similarly, when opening the mold, the moving distance of the movable plate 5 is approximately twice the moving distance of the rotary plate 6, so that the first mold K1 and the second mold K
The opening and closing timings of the molds 2 were not aligned, and the movable plate 5 and rotary plate 6 were not able to move smoothly, causing vibration and noise. Moreover, since the moving distance of the movable platen 5 is long, the mold opening/closing time becomes longer, resulting in a problem that the molding cycle time becomes longer.

In addition, the tie bar 3 and the mold clamping plate 4 are supported by the support plate 2.
etc. are held on the bed 1, so the support plate 2
The strength of the heating cylinder 11 must be made sufficiently large, and consideration must be given to, for example, making the diameter of the insertion hole 2a small enough to allow the heating cylinder 11 to be inserted therethrough. For this reason,
In the injection device 10, an injection hydraulic cylinder 14 and a hydraulic motor 15 are installed vertically behind the heating cylinder 11 in the axial direction, and only the heating cylinder 11 is connected to the moving plate 5 side through the insertion hole 2a in the support plate. It needs to be configured so that it sticks out. For this reason, there was a problem in that the screw drive device 13 extended for a long time in the axial direction rearward of the heating cylinder 11, resulting in an increase in the overall length of the injection molding machine.

The present invention has been made in view of the above circumstances, and aims to reduce vibration and noise by synchronizing the timing of mold opening and closing of the first mold clamping part and the second mold clamping part, and also reduces the overall length of the machine. The purpose of this invention is to provide an injection molding machine that can achieve the following.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a fixed platen having a plurality of mold clamping cylinder holes and fixed on the bed, and a fixed platen having a plurality of mold clamping cylinder holes in each mold clamping cylinder hole of the fixed platen. A tie bar extending in parallel from the fixed plate into which a piston portion formed at one end is inserted, a movable plate provided movably along the tie bar, and a tie bar between the movable plate and the fixed plate. an intermediate plate which is provided movably along the fixed plate and constitutes a first mold clamping part with the movable plate; and an intermediate plate which constitutes a second mold clamping part with the movable plate; and a first mold opening/closing cylinder connected to the fixed plate and driving the intermediate plate to move toward and away from the fixed plate, and a first mold opening/closing cylinder connected to the intermediate plate and the movable plate to move the movable plate. A second drive unit that moves in a direction toward and away from the intermediate board.
A mold opening/closing cylinder, a connecting means for connecting and disconnecting the movable platen and the tie bar, and an injection device located outside the fixed platen and the movable platen so as to face each other. be.

[Function] In the present invention, by contracting the rods of the first mold opening/closing cylinder and the second mold opening/closing cylinder, the intermediate plate moves toward the fixed plate, and
The movable platen moves to the intermediate plate side, and the first mold clamping part and the second mold clamping part enter the mold closed state. At this time, since the intermediate plate is moving toward the fixed plate, the movable plate will move approximately twice the distance traveled by the intermediate plate, but the second mold opening/closing cylinder itself is connected to the intermediate plate. Since it moves at the same speed as the intermediate plate, the movable plate moves at about twice the speed of the intermediate plate. For this reason,
The timings at which the first mold clamping part and the second mold clamping part finish closing the mold almost coincide with each other. Similarly, the timing at the end of mold opening is almost the same for the first mold clamping part and the second mold clamping part.

In addition, at the end of mold closing, the movable plate and the tie bar are connected by the connecting means, and in this state, by supplying pressure oil to the tie bar side in the mold clamping cylinder hole, the tie bar moves to the fixed plate side. As a result, the movable platen moves toward the fixed platen, and the first mold clamping part and the second mold clamping part enter the mold clamping state.

As described above, since the fixed platen is fixed on the bed, the tie bar, intermediate platen, and movable platen can be supported on the bed by the fixed platen.
Therefore, there is no need to use a support plate that was conventionally required to support tie bars and the like on the outside of the movable plate. For this reason, the injection device can be freely moved to the movable plate side without being obstructed by the support plate. Therefore, the structure of the injection device can be changed, for example, by arranging the screw linear drive means next to the heating cylinder. As a result, the overall length of the injection molding machine can be shortened.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In Figures 1 and 2, 21 is bet 2
2 is a fixed plate 21 fixed to the fixed plate 2.
Four tie bars 23 are extended in parallel from 1,
A rotary disk (intermediate disk) 2 is placed on these tie bars 23.
4. A moving board 25 is provided.

The fixed platen 21 is formed into a rectangular plate shape, and a conical nozzle insertion hole 21a is formed in the center thereof, and mold clamping cylinder holes 21b are formed in its four corners. has been done. and,
A tie bar 23 is inserted into each mold clamping cylinder hole 21b.

The tie bar 23 has the fixed platen 21 at one end thereof.
A piston 26 is provided which fits into the mold clamping cylinder hole 21b so as to be able to move freely in the axial direction, and one end of the piston 26 is connected to the small diameter portion 23 with the approximate longitudinal center as the boundary.
a, and the other end is formed as a large diameter portion 23b. This tie bar 23 has a piston 26 fitted into each mold clamping cylinder hole 21b, and the fixed platen 21
It protrudes perpendicularly from the mold mounting surface 21c,
A rotary disk 24 is slidably provided in the small diameter portion 23a, and a movable disk 25 is slidably fitted in the large diameter portion 23b.

The rotary disk 24 has through holes 2 that fit into the small diameter portions 23a of the two upper tie bars 23 so as to be movable laterally.
7a, and a lower bearing part 2 having a through hole (not shown) that fits into the small diameter part 23a of the two lower tie bars 23 so as to be movable in the axial direction.
8, this lower bearing portion 28 and upper bearing portion 27
In FIG. 2, the rotary block 29 is rotatably connected about an axis in the vertical direction. This rotating block 29 is formed in the shape of a square prism, and each circumferential surface is a mold mounting surface 29a. A hydraulic ejector cylinder (not shown) is constructed within the rotary block 29 to cause an ejector rod (not shown) to protrude outward from each mold mounting surface 29a. This hydraulic ejector cylinder is connected to an external hydraulic power source through a rotary joint (not shown) provided between the rotary block 29 and the lower bearing portion 28. Further, the lower bearing portion 28 is connected to a linearly movable support member 31 installed on the bed 22 via a height adjustment member 30.

The height adjustment member 30 includes an upper plate 32 and a lower plate 33 that are connected via an inclined sliding surface. , the height from the linearly movable support member 31 is adjustable.

The linearly movable support member 31 has rails 34 fixed in parallel to each tie bar 23 at each position on the bed 22 corresponding to the lower two tie bars 23,
It is provided with a moving body 35 supported by the rail 34 and movable along the rail 34, and the lower plate 33 of the height adjusting member 30 is connected to the upper surface of the moving body 35.

The movable plate 25 is formed into a rectangular plate shape, and has a nozzle insertion hole 25 in its center.
a is formed, and through holes 25b through which the large diameter portions 23c of the tie bars 23 are inserted are formed at its four corners. A mold mounting surface 25c is formed on the movable platen 25 on the side facing the rotary platen 24,
Tie bar 23 on the surface opposite to the mold mounting surface 25c
A vertical groove 25d extending in the vertical direction is formed in the protruding portion, and a cylindrical body 36 that covers the vertical groove 25d and fits in the tie bar 23 so as to be slidable in the axial direction is formed in the vertical groove 25d. installed. The lower end surface of the movable platen 25 configured in this manner is connected to the movable body 35 of the linearly movable support member 31 via the height adjustment member 30.

The tie bar 23 also has a large diameter portion 23.
A stopper block 37 is provided at b to prevent movement of the movable plate 25 toward the rotary plate 24.

The stopper block 37 is fixed with a bolt to a chamfered portion formed on the large diameter portion 23b of each tie bar 23, and by adjusting the mounting position of the chamfered portion, the mold of the movable platen 25 can be removed at the same time. Mounting surface 25
It can be adjusted so that it comes into contact with c.

Further, a lock member 38 is provided on the movable plate 25 so as to be movable along the vertical groove 25d.

As shown in FIG. 3, the lock member 38 is guided by the vertical groove 25d of the movable plate 25 and includes two sets of left and right lock plates 39, 39 that are movable in the vertical direction.
, a connecting plate 41 for connecting these lock plates 39, 39 with bolts 40, and a locking hydraulic cylinder 42 connected to this connecting plate 41. The lock plate 39 is formed into a rectangular plate shape, and has a length narrower than the large diameter portion 23b of the tie bar 23 at the center position in the width direction, matching the pitch of the upper and lower tie bars 23. The hole 39a is formed to be long in the vertical direction, and a circular hole 39 having a slightly larger diameter than the large diameter portion 23b of the tie bar 23 is continuous to the upper elongated hole 39a below the hole 39a.
b is formed. In addition, the lower elongated hole 39a
The lower side thereof is opened at the lower end of the lock plate 39. The connecting plate 41 is a band-shaped member that is curved upward in a convex manner, and is designed so as not to block the nozzle insertion hole 25a of the movable plate 25 when the left and right lock plates 39, 39 are connected. It's summery. The locking hydraulic cylinder 42 has a cylinder tube 42a fixed to a bracket 25e formed at the upper end of the center portion of the movable plate 25 in the left-right direction, and a tip of the rod 42b connected to the connecting plate 41.
It is connected to the right of the center in the left-right direction.

Further, the tie bar 23 is provided with the movable plate 25.
A notch 23c is formed with a diameter that engages with the elongated hole 39a of the lock plate 39 when the mold mounting surface 25c is in contact with the stopper block 37. The notch 23c formed in the tie bar 23 and the lock member 38 allow the movable platen 2
A connecting means for connecting and disconnecting the tie bar 23 and the tie bar 23 is constructed.

Furthermore, the upper and lower tie bars 23 located on the left and right
As shown in FIGS. 1 and 2, the end faces on the other end side are connected to each other by a connecting plate 43.
Each connection plate 43 is provided with mold thickness adjustment means 44 on its back side (opposite side to the movable board 25).

The mold thickness adjusting means 44 includes a mold thickness adjusting hydraulic cylinder 45 and a hydraulic device for controlling the mold thickness adjusting hydraulic cylinder 45.

The mold thickness adjusting hydraulic cylinder 45 is connected to the rod 4.
5a is connected to the connecting plate 43 at a position that coincides with the axis of the lower tie bar 23, and the cylinder tube 45
b is fixed on the bed 22 via a frame 46. The mold thickness adjusting hydraulic cylinder 45 is controlled by a hydraulic system as shown in FIG.

That is, the mold thickness adjusting hydraulic cylinders 45 arranged on the left and right sides are connected to the seat type electromagnetic switching valves M1, M1, etc. on their rod and head sides, respectively, and the seat type electromagnetic switching valve M1 is further connected to the rod The ones on the side are connected to the B port of the electromagnetic switching valve M2, and the ones on the head side are connected to the A port of the electromagnetic switching valve M2. The seat type electromagnetic switching valve M1 is formed of a two-position switching valve, and is in an all-port blocked state at the neutral position by a check mechanism. Therefore, in the seat type electromagnetic switching valve M1, leakage of pressure oil at the neutral position is extremely reduced. Further, the seat type electromagnetic switching valve M1 connects the upstream side and the downstream side when the solenoid M1a is excited. On the other hand, the electromagnetic switching valve M2 is in the neutral position.
It is a 3-position switching valve with an ABR connection, and when solenoid M2a is energized, pressure oil supplied from hydraulic source P is supplied to the head side of hydraulic cylinder 45 for mold thickness adjustment, and solenoid M2b is activated. When excited, pressure oil is supplied to the rod side of the mold thickness adjusting hydraulic cylinder 45.

In addition, first mold opening/closing hydraulic cylinders 47 are provided on the left and right sides of the rotary plate 24 and the fixed plate 21 at the upper and lower positions thereof, and the rotary plate 24 and the movable plate 21
Second mold opening/closing hydraulic cylinders 48 are provided on the left and right sides of the mold opening/closing cylinder 5 with their axes aligned with the first mold opening/closing hydraulic cylinders 47 .

The first mold opening/closing hydraulic cylinder 47 has a cylinder tube 47b whose inner diameter is smaller than that of the mold clamping cylinder hole 21b.
a can be expanded and contracted at high speed. And each first mold opening/closing hydraulic cylinder 47
The cylinder tube 47b is connected to the side surface of the stationary plate 12, and the tip of the rod 47a is connected to the upper bearing portion 27 or the lower bearing portion 28 of the rotary disk 24.

On the other hand, the second mold opening/closing hydraulic cylinder 48 has the same cylinder tube inner diameter and stroke as the first mold opening/closing hydraulic cylinder 47, and its cylinder tube 48b is attached to the side surface of the movable platen 25. The tip of the rod 48a is connected to the upper bearing portion 27 or the lower bearing portion 2 of the rotary disk 24.
It is connected to 8. Further, a stopper bolt 49 is provided on the upper bearing portion 27 and the lower bearing portion 28 of the rotary disk 24 at a position facing the stopper block 37.
are screwed together.

The stopper bolt 49 has the end face of its head 49a in contact with the end face of the stopper lock 37 to regulate the position of the rotary disk 24 when the mold is opened.
By adjusting the amount of screwing, the rotary plate 2
4 stop positions are adjustable.

In the mold clamping device configured as above,
The fixed plate 21 and the rotary plate 24 constitute a first mold clamping part, and the movable plate 25 and the rotary disc 24 constitute a second mold clamping part. A first injection device 51 and a second injection device 61 are provided at positions outside the fixed platen 21 and the movable platen 25 so as to face each other.

The first injection device 51 is supported by a guide frame 52 fixed on the bed 22 so as to be movable in the direction toward and away from the stationary plate 21. The screw 54 has a screw 54 inserted therein, and a screw driving means 55 for driving the screw 54.

The screw driving means 55 includes a linear driving section 56 of the screw 54 and a rotational driving section 57 of the screw 54.
The linear drive unit 56 has a heating cylinder holding part 56a that holds the heating cylinder 53 in the center thereof, and injection hydraulic cylinders 56b are arranged at the left and right positions of this heating cylinder holding part 56a. It is constructed. This linear drive section 56 is
It is movably supported by a guide frame 52, and its lower end is connected to a hydraulic cylinder 5 for moving the injection device.
It is connected to the fixed platen 21 via 8. Also,
Each injection hydraulic cylinder 56 of the linear drive section 56
b has its rod 56c connected to a rotational drive section 57. The rotational drive section 57 is provided with a hydraulic motor 59 that rotationally drives the screw 54, and the rotational drive section 57 is also movably supported by the guide frame 52.

The second injection device 61 is aligned in the direction of approaching and separating from the movable platen 25, and is fixed on the bed 22.
Movable guide stand 63 that moves on the book rail 62
It has a heating cylinder 53, a screw 54, and a screw driving means 55 similar to the first injection device 51. However, the rotation drive section 57 of the screw drive means 55 is movably supported by the movable guide frame 63, but the linear drive section 56 is fixed to the movable guide frame 63.
Further, this movable guide frame 63 is connected to the movable platen 25 by a hydraulic cylinder 64 for moving the injection device.

In addition, in FIGS. 1 and 2, K1 is a first mold, and K2 is a second mold.

Next, the operation of the injection molding machine configured as described above will be explained.

First, when clamping the mold from the mold open state, the rods of the first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 48 are retracted, and the rotary plate 24 and movable plate 25 are moved to the fixed plate 21 side. Moving. At this time, the moving distance of the movable plate 25 required for mold closing is the first
If the mold thicknesses of the second mold K1 and the second mold K2 are the same and the mold opening dimensions are the same, the rotary plate 24 moves toward the fixed plate 21, so that the thickness becomes twice that of the rotary plate 24. The moving speed of the moving plate 25 is determined by the fact that the first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 48 are connected via the rotary plate 24.
Moreover, since the inner diameter of the cylinder tube of each mold opening/closing hydraulic cylinder is the same, the diameter is twice that of the rotary disk 24. For this reason, the timing of completion of mold closing of the first mold K1 and the second mold K2 coincides. When the mold closing is completed, the mold mounting surface 25c of the movable platen 25 comes into contact with the stopper block 37, and at this point, a limit switch (not shown) detects the mold closing completion state and starts the first mold opening/closing operation. The supply of pressure oil to the locking hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 48 is stopped, and the locking hydraulic cylinder 42
Supply pressure oil to the head side. Then, the lock plate 39 moves downward, and the elongated hole 39a of the lock plate 39 is inserted into the notch 23 of the tie bar 23.
engages c. As a result, the movable platen 25 becomes connected to the tie bar 23. In this state, the solenoid M1a of the seat type electromagnetic switching valve M1 is energized to open the seat type electromagnetic switching valve M1, so that the rod 45a of the mold thickness adjusting hydraulic cylinder 45 can freely expand and contract. Then, mold clamping cylinder hole 2
Pressure oil is supplied to the tie bar 23 side of 1b, and the tie bar 23 is moved to the fixed platen 21 side. Then, the tie bar 23 moves to the fixed plate 21 side, and the movable plate 25 moves to the fixed plate 21 side via the notch 23c of the tie bar 23 and the lock plate 39.
The mold K1 and the second mold K2 are in a clamped state. At this time, the mold clamping force is adjusted by adjusting the pressure of the pressure oil supplied to the mold clamping cylinder hole 21b. Further, the thickness of the mold can be adjusted by the amount of movement of the piston 26 within the mold clamping cylinder hole 21b.

In order to inject resin into the mold clamped as described above, hydraulic cylinders 58 and 64 for moving the injection device are used.
Pressure oil is supplied to move the first injection device 51 to the fixed platen 21 side, and the second injection device 61
is moved to the movable plate 25 side, and the nozzle tip of the heating cylinder 53 of each injection device is pressed against the first mold K1 or the second mold K2 through the nozzle insertion hole 21a or the nozzle insertion hole 25a. At this time, the second injection device 61 is already moved together with the movable platen 25 by being pulled by the injection device movement hydraulic cylinder 64 when the movable platen 25 is moved, so the second injection device 61 is almost the same as the first injection device 51. The tip of the heating cylinder 53 comes into contact with the second mold K2 by a moving distance of . Then, with the tip of each heating cylinder 53 pressed against each mold, pressurized oil is supplied to each injection hydraulic cylinder 56b, and the rotation drive unit 57 is moved toward the heating cylinder 53 side. Then, the screw 54 moves toward each mold, and the resin on the tip side of the screw 54 is injected into each mold. After injection, while the resin is being cooled in each mold, pressure oil is supplied to the hydraulic motor 59 to rotate the screw 54, thereby melting the resin and rotating the screw 54.
Move it to the tip side of 4. When the movement of the resin is completed, before opening the mold, press the hydraulic cylinder 5 for moving the injection device.
Pressure oil is supplied to 8 and 64, and the heating cylinder 5 is heated from each mold.
Release the tip of 3. After the resin has cooled and solidified, the mold is opened and the molded product is taken out.

When opening the mold, first open the mold clamping cylinder hole 2.
Pressure oil is supplied to the head side of the piston 26 in 1b, and the movable platen 25 is slightly moved in the direction away from the fixed platen 21 to release the mold clamping state. Then, the end face of the notch 23c of the tie bar 23 and the lock plate 3
The pressing force between the lock plate 39 and the elongated hole 39a is released, and the lock plate 39 can be lifted up. In this state, the solenoid M2a of the electromagnetic switching valve M2 is energized to supply pressure oil to the head side of the left and right mold thickness adjustment hydraulic cylinders 45. Then, the force of each hydraulic cylinder 45 for mold thickness adjustment is transmitted to the upper and lower tie bars 23 via the connection plate 43, and the mold thickness position is corrected by the balance of the force of the pressure oil from the head side of the piston 26. This improves the accuracy of the mold opening completion position. Then, after returning the seat type electromagnetic switching valve M1 and the electromagnetic switching valve M2 to the neutral position, pressure oil is supplied to the rod side of the locking hydraulic cylinder 42 to raise the lock plate 39 and increase the length of the lock plate 39. The engagement state between the hole 39a and the notch 23c of the tie bar 23 is released. As a result, the movable platen 25 becomes movable relative to the tie bar 23. However, since the seat-type electromagnetic switching valve M1 has been returned to the neutral position and the hydraulic oil on the rod side and head side is completely closed, the mold thickness adjustment hydraulic cylinder 45 is in a state in which the axial direction of the tie bar 23 is Movement is definitely prevented. In this state, the first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 48
Pressure oil is supplied to the head side of the rotary plate 24 and the movable plate 25 to move the rotary plate 24 and the movable plate 25 in a direction away from the fixed plate 21. As a result, the first mold K1 and the second mold K2 are brought into an opened state. When the mold opening is completed, the end face of the head 49a of the stopper bolt 49 provided on the rotary disk 24 comes into contact with the stopper lock 37, and at this point, a limit switch (not shown) detects the mold opening completion state. The first mold opening/closing hydraulic cylinder 47 and the second mold opening/closing hydraulic cylinder 47
The supply of pressure oil to the mold opening/closing hydraulic cylinder 48 is stopped. The position at which the mold opening is completed can be determined by adjusting the screwing amount of the stopper bolt 49.
It can be adjusted in various ways. Also, when opening the mold, the moving distance of the movable plate 25 is 2 times the moving distance of the rotary plate 24.
However, the moving speed of the movable plate 25 is
Since the moving speed is twice as fast as that of , the timing of mold opening completion coincides.

Further, a rotary drive mechanism such as a hydraulic motor (not shown) rotates the rotary block 29 of the rotary disk 24, and for example, the rotary block 29 is rotated every molding cycle.
By rotating 180°, on the first resin molded product injected by the first injection device 51,
The second resin injected by the second injection device 61 is laminated to obtain a two-layer molded product having different colors, materials, and the like. In addition, by rotating 90 degrees at a time, you can perform secondary processing such as inserts and outserts, and 3rd-party processing such as hot stamping from the operation side or the non-operation side.
Further processing is possible. The apparatus for secondary processing and tertiary processing is preferably installed at the mold closing completion position and the mold opening completion position of the rotary disk 24 on the operation side or the non-operation side.

In the injection molding machine configured as described above, the moving distance of the movable plate 25 is twice that of the rotary plate 24, but the moving speed of the movable plate 25 is twice that of the rotary plate 24, so the first mold K1 and second mold K
The timing of completion of mold closing and completion of mold opening can be made to coincide with that of No. 2. For this reason, the second mold K
Since the delay in mold opening/closing time described in No. 2 can be prevented, the molding cycle time can be shortened compared to the conventional method. Furthermore, since the timings of mold closing and mold opening are the same, it is possible to prevent the vibration and noise that would otherwise occur due to mismatched timing, and to reduce the vibration and noise of the injection molding machine. can.

Furthermore, since the connecting plate 43 is to transmit the force of the hydraulic cylinder 45 for mold thickness adjustment to the upper and lower tie bars 23, it is not necessary to have a large one in terms of strength, and a plate-like plate that connects the tie bars 23 is sufficient. . Therefore, the connection plate 43 does not get in the way of the movement of the second injection device 61, and for this reason, the structure of the second injection device 61 is such that the injection hydraulic cylinder 56b is placed next to the heating cylinder 53. It can be structured like this. Therefore, compared to the conventional structure in which the injection hydraulic cylinder and the hydraulic motor are arranged vertically behind the heating cylinder in the axial direction, the injection hydraulic cylinder 56b is arranged laterally, and the second injection device 61 This has the advantage that the total length of the injection molding machine can be shortened, and the total length of the injection molding machine can be shortened accordingly.

Furthermore, the positions of the rotary plate 24 and the movable plate 25 can be corrected to the mold closing completion position by the mold thickness adjusting hydraulic cylinder 45 every cycle of molding, so that the mold clamping is completed from the mold closed state. The amount of movement of the movable plate 25 when the movable plate 25 is moved can be made extremely small. Therefore, the time from the mold closing completion state to the mold clamping completion state can be shortened, and from this point of view as well, there is an advantage that the molding cycle time can be shortened.

Furthermore, by simply supplying pressure oil to the locking hydraulic cylinder 42, the notch 2 formed in the tie bar 23 can be
3c can be engaged with the elongated hole 39a of the lock plate 39, so that the movable platen 25 and the tie bar 23 can be engaged with each other.
can be connected extremely easily.

[Effects of the Invention] As explained above, according to the present invention, the moving distance of the movable plate is approximately twice that of the intermediate plate, but the moving speed of the movable plate is approximately twice that of the intermediate plate. The timing of completion of mold closing and completion of mold opening of the first mold clamping part and the second mold clamping part can be made substantially coincident.
Therefore, the mold opening/closing time of the second mold clamping part does not lag behind the mold opening/closing time of the first mold clamping part, so that the molding cycle time can be shortened by that much compared to the conventional method. Moreover, since the timings of mold closing and mold opening are the same, it is possible to prevent the vibration and noise that would normally occur due to mismatched timing, thereby reducing the vibration and noise of the injection molding machine. .

In addition, since the fixed plate is fixed on the bed and the tie bars, intermediate plate, and movable plate are supported on the bed, there is no need for a support plate that was conventionally provided outside the movable plate. The board can be moved freely without being hindered by the support board.
Therefore, the structure of the injection device can be configured such that, for example, the screw drive means is arranged next to the heating tube, and as a result, the overall length of the injection device can be shortened, and the overall length of the injection molding machine can be reduced accordingly. It has the advantage that it can be made shorter.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams showing an embodiment of the present invention, in which Figure 1 is a cutaway plan view of essential parts of an injection molding machine showing the mold in an open state, and Figure 2 shows a cutaway view of the injection molding machine in a closed state. Fig. 3 is a cross-sectional view taken along the - line in Fig. 1, Fig. 4 is a hydraulic circuit diagram showing the hydraulic system, and Fig. 5 is an injection molding machine shown as a conventional example. FIG. 2 is a front view with a main part of the molding machine cut away. 21...Fixed plate, 21b...Mold clamping cylinder hole,
22...bed, 23...tie bar, 23a...
Notch, 24... Rotating disk (intermediate disk), 25... Moving plate, 26... Piston, 38... Lock member, 4
7...First mold opening/closing hydraulic cylinder, 48...Second mold opening/closing hydraulic cylinder, 51...First injection device, 61...Second injection device.

Claims (1)

[Claims] 1. A fixed plate having a plurality of mold clamping cylinder holes and fixed on the bed, and a piston portion formed at one end inserted into each mold clamping cylinder hole of this fixed plate and extending in parallel from the fixed plate. a movable plate provided movably along the tie bar, and a movable plate provided movably along the tie bar between the movable plate and the fixed plate, and the first An intermediate plate that constitutes a mold clamping part and also constitutes a second mold clamping part by the movable plate; and an intermediate plate that is connected to the intermediate plate and the fixed plate, and that moves the intermediate plate toward and away from the fixed plate; a first mold opening/closing cylinder that is driven to move in the direction of moving the mold, and a second mold opening/closing cylinder that is connected to the intermediate plate and the movable plate and drives the movable plate to move in the direction of moving toward and away from the intermediate plate; Injection molding comprising: a connecting means for connecting and disconnecting the movable plate and the tie bar; and an injection device located outside the fixed plate and the movable plate so as to face each other. Machine.