JP2585801Y2 - Rotary disk positioning device for injection molding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to injection molding in which two sets of injection devices are provided, two sets of dies are simultaneously clamped, and resin is injected from each injection device in each of the dies. The present invention relates to a rotary positioning device for a machine.

[0002]

2. Description of the Related Art Conventionally, there has been known a rotary disk positioning device for an injection molding machine of this type shown in FIGS. 2 to 5 (see Japanese Patent Publication No. 5-71771). In the rotary disk positioning device of this injection molding machine, the fixed disk 21 and the rotary disk 2
4. Molds K1, K2 mounted between moving platen 25
When the mold opening operation is performed by releasing the mold clamping force acting on the tie bar 23, the movement of the tie bar 23 is controlled by the notch 2 provided in the tie bar 23.
In order to release the pressing force between the lock plate 3c and the elongated hole 39a of the lock plate 39, the lock plate 39 moves toward the movable platen 25. At this time, notch 23
A gap is formed between the lock plate 39 and the slot 39a of the lock plate 39, and the gap is the amount of movement of the tie bar 23. Also, in synchronization with the movement of the tie bar 23, the tie bar-2
Hydraulic cylinder 45 for mold thickness adjustment connected to the end of
Is a hydraulic motor for rotating the screw 54.
It moves to the side of data 59. The hydraulic cylinder 45 for adjusting the mold thickness at this time
Is controlled by using a solenoid type solenoid-operated directional control valve M1, M2.

When the movement of the tie bar 23 is completed, the rotary plate 24 and the moving plate 25 are respectively moved by the first mold opening / closing hydraulic cylinder 47 and the second mold opening / closing hydraulic cylinder 48.
The mold moves in a direction away from the fixed board 21 to perform a mold opening operation. When the mold opening is completed, the head 49a of the stopper bolt 49 provided on the rotary disk 24 hits the stopper block 37 provided on the tie bar 23, and this point is defined as the mold opening completed position.

[0004]

However, the head 49a of the stopper bolt 49 is not provided with the stopper block 37.
, The thrust at the time of opening of the first mold opening / closing hydraulic cylinder 47 acts on the stopper block 37. This thrust acts on the tie bar 23 via the stopper block 37. Hydraulic cylinder for mold thickness adjustment 4 connected to tie bar 23
At this time, the sheet-type electromagnetic switching valve M1 which controls the valve 5 is in the neutral position and has a very small leak (leakage).
Although the hydraulic cylinder 5 is hydraulically locked, the hydraulic oil on the head side of the mold thickness adjusting hydraulic cylinder 45 is compressed by the thrust, and the rod 45a moves by the amount of the compression, so that the tie bar 23 is injected. It moves toward the device 61.
For example, if the compression amount of the hydraulic oil is 1 percent, the compression amount at the time of opening the mold is 20 when the opening amount is 200 mm.
0 mm × 0.01 = 2 mm, and the hydraulic oil is compressed by 2 mm. Since the amount of compression is not always constant due to oil temperature, sliding resistance in operation, etc., there is a problem that the stop position of the turntable 24 (the mold opening completion position) varies every cycle. When the stop position of the turntable 24 varies, the rotation block 29 is turned 90 every cycle ^. When the operation such as insert is performed by a peripheral device such as an insert robot from the operation side or the non-operation side of the machine by rotating the machine one by one, there is a problem that these operations cannot be performed smoothly and reliably. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary disk positioning device of an injection molding machine which has a simple structure and which always keeps a mold opening completion position constant.

[0005]

In order to achieve the above object, a positioning device for an injection molding machine according to the present invention includes a fixed plate having a plurality of mold cylinder holes and fixed on a bed, and a fixed plate. A tie bar extending in parallel with the fixed plate by inserting a piston portion formed at one end into each of the mold clamping cylinder holes.
A movable plate movably provided along the tie bar; and a first mold clamping portion provided movably along the tie bar between the movable plate and the fixed plate by the fixed plate. And a rotating disk that forms a second mold clamping portion with the moving disk, and is connected to the rotating disk and the fixed disk to move the rotating disk toward and away from the fixed disk. A first mold opening / closing cylinder, a second mold opening / closing cylinder connected to the rotating plate and the moving plate, and driving the moving plate to move toward and away from the rotating plate; An injection molding machine comprising: connecting means for connecting and disconnecting a tie bar; and an injection device provided outside the fixed platen and the movable platen and provided so as to face each other. A hydraulic cylinder for adjusting the mold thickness is installed on the The head side of the oilseed hydraulic cylinders, the mechanical stopper for restricting the relative movement of the hydraulic cylinder piston to the head side, in which attached movably adjusted in the axial direction of the hydraulic cylinder.

[0006]

[Function] The rotary plate positioning device of the injection molding machine of the present invention is:
With the above configuration, when releasing the mold clamping force acting on the mold and performing the mold opening operation, the stopper block provided on the turntable has the head of the stopper bolt provided on the tie bar. In this case, the thrust of the mold opening / closing hydraulic cylinder acts on the stopper block, and the hydraulic oil on the head side of the mold thickness adjusting hydraulic cylinder connected to the tie bar is compressed to the above-mentioned thrust. Tries to move. Although the amount of compression is not constant due to oil temperature, sliding resistance in operation, etc., the amount of movement of the tie bar is always constant by the piston of the hydraulic cylinder for mold thickness adjustment coming into contact with the mechanical stopper. Also, the stop position (the mold opening completion position) of the turntable is always constant.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The basic configuration of the injection molding machine to which the present invention is applied is as follows:
Since it overlaps with the invention described in Japanese Patent Publication No. 5-7171, the description will be made with reference to the drawings of the publication. 2 and 3
In the figure, reference numeral 21 denotes a fixed plate fixed to a bed 22. Four tie bars 23 extend in parallel from the fixed plate 21, and a rotary plate 24 and a moving plate 25 are provided on these tie bars 23. Have been. The fixed platen 21 is formed in a rectangular plate shape, a conical nozzle insertion hole 21a is formed in the center part, and a mold clamping cylinder hole 21b is formed in the four corners. Have been. A tie bar 23 is inserted into each of the mold clamping cylinder holes 21b.

The tie bar 23 has one end of the fixed plate 2
A piston 26 is axially movably fitted into one of the mold clamping cylinder holes 21b. One end is formed in the small-diameter portion 23a around a substantially central portion in the longitudinal direction, and the other end is formed in the small-diameter portion 23a. It is formed on the large diameter portion 23b. This Tiba-2
Reference numeral 3 denotes a piston 26 which is fitted into each of the mold clamping cylinder holes 21b and protrudes vertically from the mold mounting surface 21c of the fixed platen 21, and a rotary plate 24 is slidably provided on the small diameter portion 23a. A movable platen 25 is slidably fitted to the large diameter portion 23b.

The turntable 24 is composed of two upper tie bars 23.
Through hole 27 which is movably fitted in the small-diameter portion 23a in the lateral direction.
a, and two lower tie bars -2
3, a lower bearing portion 28 having a through hole (not shown) which is movably fitted in the small diameter portion 23a in the axial direction, and the lower bearing portion 28 and the upper bearing portion 27 are provided with an axial center in the vertical direction in FIG. Rotating block 2 rotatably connected to the center
9 is provided. The rotating block 29 is formed in a quadrangular prism shape, and each peripheral surface has a mold mounting surface 2.
9a. Inside the rotary block 29, an ejector rod (not shown) is mounted on each mold mounting surface 29.
A hydraulic actuator cylinder (not shown) for projecting outward from a is configured. The hydraulic actuator cylinder is connected to an external hydraulic source through a rotary joint (not shown) provided between the rotary block 29 and the lower bearing 28. The lower bearing 28 is connected to a linearly movable support member 31 installed on the bed 22 via a height adjustment member 30.

The height adjusting member 30 is provided with an upper plate 32 and a lower plate 33 connected via an inclined sliding surface. The height from the linearly movable support member 31 can be adjusted. Linearly movable support member 31
A rail 34 fixed parallel to each tie bar 23 is provided at each position on the bead 22 corresponding to the two lower tie bars 23, and the rail is supported by the rails 34. And a movable body 35 movable along a ruler 34, and a lower plate 33 of the height adjusting member 30 is connected to an upper surface of the movable body 35.

The moving platen 25 is formed in a rectangular plate shape, and has a nozzle insertion hole 25a at the center thereof.
Are formed, and the large-diameter portion 23c of the tie bar 23 is formed at the four corners.
Is formed through the through hole 25b. The movable platen 25 is provided with a mold mounting surface 25c on the surface facing the rotary plate 24, and the portion opposite to the mold mounting surface 25c on which the tie bar 23 protrudes has a vertical direction. A cylindrical body 36 that covers the vertical groove 25d and is fitted to the tie bar 23 so as to be slidable in the axial direction is attached to the vertical groove 25d. The movable platen 25 thus configured has a lower end face having a height adjusting member 30 and a movable body 3 of a linearly movable support member 31.
5. The tie bar 23 is provided with a stopper block 37 for preventing the moving plate 25 from moving toward the rotary plate 24 at the large diameter portion 23b.

The stopper block 37 is provided for each tie bar 23.
Is fixed to the chamfered portion formed on the large-diameter portion 23b with bolts. By adjusting the mounting position of the chamfered portion, it is simultaneously adjusted so as to come into contact with the mold mounting surface 25c of the moving platen 25. It is possible. The movable platen 25 has a lock member 38 movably along the vertical groove 25d.
Is provided.

As shown in FIG. 4, the lock member 38 is guided by the vertical groove 25d of the movable platen 25, and is capable of moving vertically in two sets of left and right lock plates 39, 39 and these lock plates. The vehicle includes a connecting plate 41 connecting the 39 and 39 with bolts 40, and a locking hydraulic cylinder 42 connected to the connecting plate 41. Lock plate 39
Is formed in a rectangular plate shape, and a narrow slot 39a having a narrow width is formed vertically above and below the center position in the width direction in accordance with the pitch of the upper and lower tie bars 23. The upper elongated hole 39a has a circular hole 3 having a diameter slightly larger than the large diameter portion 23b of the tie bar 23.
9b is formed. The lower slot 39a is open at the lower end of the lock plate 39 at the lower side.
The connecting plate 41 is a belt-shaped member formed by curving upward in a convex shape. With the left and right lock plates 39, 39 connected, the nozzle insertion hole 25 a of the moving platen 25 is not blocked. It has become.

The locking hydraulic cylinder 42 has a cylinder tube 42a fixed to a bracket 25e formed at the upper end of the center of the moving board 25 in the left-right direction. Are connected to the right of the center. Further, the die mounting surface 25c of the moving platen 25 is provided on the tie bar 23 with a stopper block 37.
A notch 23c having a diameter with which the long hole 39a of the lock plate 39 engages when the abutment is formed. The notch 23c formed in the tie bar 23 and the lock member 38 constitute connecting means for connecting the moving platen 25 to the tie bar 23 and releasing the tie bar 23.
Further, as shown in FIGS. 2 and 3, the upper and lower tie bars 23 located on the left and right are connected to the connection plate 43 on the other end side.
Connected by And, in each connection plate 43,
The mold thickness adjusting means 44 is provided on the back side (the side opposite to the moving platen 25).
Is provided.

The mold thickness adjusting means 44 includes a mold thickness adjusting hydraulic cylinder 45, a mechanical stopper 20, and a hydraulic device for controlling the mold thickness adjusting hydraulic cylinder 45. The hydraulic cylinder 45 for adjusting the mold thickness has its piston 45.
The rod 45a connected to one side of the lower tie bar 23
The cylinder tube 45b is fixed to the bed 22 via the gantry 46 by being connected to the connection plate 43 at a position coinciding with the axis. As shown in FIG. 1, the mechanical stopper 20 is moved in the axial direction of the hydraulic cylinder 45 in order to restrict the relative movement of the piston 45c of the hydraulic cylinder 45 toward the head. Adjustably mounted. The mechanical stopper 20 is a screw shaft 20a. The mechanical stopper 20 is rotated by a required amount in the screwing direction and then fixed by the locking nut 20b. . Thus, by adjusting the distance between the mechanical stopper 20 and the piston 45c in accordance with the amount of opening movement of the tie bar,
The tie-bar movement amount A is always constant for the same mold thickness, and the stop position of the turntable 24 is also always constant. And
The mold thickness adjusting hydraulic cylinder 45 is controlled by a hydraulic device as shown in FIG.

That is, each of the mold thickness adjusting hydraulic cylinders 45 disposed on the left and right sides is connected to a sheet type electromagnetic switching valve M1, M1,. The valves M1 are further connected on the rod side to the B port of the electromagnetic switching valve M2, and connected on the head side to the A port of the electromagnetic switching valve M2. The sheet type electromagnetic switching valve M1 is formed of a two-position switching valve, and is in an all-port blocked state by a check mechanism at a neutral position. Therefore, in the sheet-type electromagnetic switching valve M1, the leakage of the pressure oil at the neutral position is extremely small. In addition, the sheet type electromagnetic switching valve M
Numeral 1 connects the upstream side and the downstream side when the solenoid M1a is excited. On the other hand, the electromagnetic switching valve M
Reference numeral 2 denotes a three-position switching valve that is ABR-connected at the neutral position, and when the solenoid M2a is excited, the hydraulic pressure source P
Is supplied to the head side of the mold thickness adjusting hydraulic cylinder 45, and when the solenoid M2b is excited,
Pressure oil is supplied to the rod side of the mold thickness adjusting hydraulic cylinder 45.

A first mold opening / closing hydraulic cylinder 47 is provided on the left and right sides of the rotary plate 24 and the fixed platen 21 at upper and lower positions.
A second mold opening / closing hydraulic cylinder 48 is provided on the left and right sides of the rotating plate 24 and the moving platen 25 so that the first mold opening / closing hydraulic cylinder 47 has the same axis. In the first mold opening / closing hydraulic cylinder 47, the inner diameter of the cylinder tube 47b is formed smaller than that of the mold clamping cylinder hole 21b, so that the rod 47a can expand and contract at a high speed. I have. Each of the first mold opening / closing hydraulic cylinders 47 has a cylinder tube 47.
b is connected to the side surface of the fixed disk 21, and the tip of the rod 47 a is connected to the upper bearing 27 or the lower bearing 28 of the rotary disk 24.
It is connected to.

The second mold opening / closing hydraulic cylinder 48
Is a first mold opening / closing hydraulic cylinder 47 and a cylinder tube.
The cylinder tube 48b is connected to the side surface of the moving platen 25, and the tip of the rod 48a is connected to the upper bearing portion 27 or the lower side of the rotary plate 24. It is connected to the bearing 28. In addition, the upper bearing portion 27 and the lower bearing portion 28 of the turntable 24
, A stopper bolt 49 is screwed at a position facing the stopper block 37. The stopper bolt 49 is
The end face of the head 49a is brought into contact with the end face of the stopper block 37 to regulate the position of the turntable 24 when the mold is opened. By adjusting the screwing amount, the stop position of the turntable 24 can be adjusted. It is adjustable.

In the mold clamping apparatus constructed as described above, the fixed mold plate 21 and the rotating plate 24 constitute a first mold clamping unit, and the moving plate 25 and the rotating plate 24 constitute a second mold clamping unit. Is configured. 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. First
The injection device 51 is supported by a guide base 52 fixed on the bed 22 so as to be movable in the direction of coming into contact with and separating from the fixed platen 21. The injection device 51 is inserted into the heating cylinder 53 and the heating cylinder 53. It has a screw 54 and screw driving means 55 for driving the screw 54.

The screw driving means 55 is composed of a linear driving section 56 of the screw 54 and a rotary driving section 57 of the screw 54. The linear driving section 56 has a heating section 53 for holding the heating cylinder 53 at the center thereof. A cylinder holding portion 56a is formed, and an injection hydraulic cylinder 56b is formed at the left and right positions of the heating cylinder holding portion 56a. The linear drive unit 56 is movably supported by the guide gantry 52, and the lower end thereof is connected to the fixed platen 21 via the injection device moving hydraulic cylinder 58. Also,
Each injection hydraulic cylinder 56b of the linear drive unit 56 has a rod 56c connected to a rotary drive unit 57. The rotation drive unit 57 is a hydraulic motor that drives the screw 54 to rotate.
The rotation drive unit 57 is also movably supported by the guide gantry 52.

The second injection device 61 is mounted on a movable guide base 63 which is aligned with the direction in which it comes into contact with and separates from the moving platen 25 and moves on two rails 62 fixed on the bed 22. The same heating cylinder 5 as the first injection device 51
3, a screw 54 and a screw driving means 55. However, the rotation driving section 57 of the screw driving means 55
Is movably supported by the movable guide frame 63, and the linear drive unit 56 is fixed to the movable guide frame 63. The movable guide base 63 is connected to the movable platen 25 by a hydraulic cylinder 64 for moving the injection device. In FIGS. 1 and 2, K1 is the first
The mold K2 is a second mold.

Next, a description will be given of the operation of the apparatus configured as described above, in which the mold clamping force of the injection molding machine is released and the mold opening operation is performed. To open the mold, first, pressurized oil is supplied to the head side of the piston 26 in the mold clamping cylinder hole 21b, and the movable platen 25 is slightly moved in a direction away from the fixed platen 21 to change the mold clamped state. solve. Then, tie bar
End face of notch 23c of 23 and slot 3 of lock plate 39
The pressing force with the portion 9a is released, and the lock plate 39 can be raised. In this state, the solenoid M2a of the electromagnetic switching valve M2 is excited to supply the pressure oil to the head sides of the left and right mold thickness adjusting hydraulic cylinders 45. Then, the force of each mold thickness adjusting hydraulic cylinder 45 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 pressure oil force from the head side of the piston 26, The accuracy of the next mold opening completion position is improved. Then, after returning the sheet 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 hydraulic cylinder for locking 42 to raise the lock plate 39, thereby increasing the lock plate. The engagement between the elongated hole 39a of the slot 39 and the notch 23c of the tie bar 23 is released.

As a result, the movable board 25 becomes movable with respect to the tie bar 23. However, since the sheet-type electromagnetic switching valve M1 is returned to the neutral position and the hydraulic fluid on the rod side and the head side is completely closed, the hydraulic cylinder 45 for mold thickness adjustment has a Axial movement is reliably prevented. In this state, the first mold opening / closing hydraulic cylinder 47 and the second mold opening / closing hydraulic cylinder 4
Then, pressure oil is supplied to the head side 8 to move the rotating plate 24 and the moving plate 25 away from the fixed plate 21. Thus, the first mold K1 and the second mold K2 are opened. When the mold opening is completed, the end face of the head 49a of the stopper bolt 49 provided on the rotating disk 24 comes into contact with the stopper block 37. At this time, the mold opening completion state is detected by a limit switch (not shown). Then, the supply of the pressure oil to the first mold opening / closing hydraulic cylinder 47 and the second mold opening / closing hydraulic cylinder 48 is stopped.

The head 49 of the stopper bolt 49
When the end surface of a contacts the stopper block 37, the thrust of the mold opening / closing hydraulic cylinder 47 acts on the stopper block 37. This thrust acts on the tie bar 23 via the stopper block 37. The sheet-type solenoid-operated directional control valve M1 that controls the mold thickness adjusting hydraulic cylinder 45 connected to the tie bar 23 is in the neutral position, and the rod-side and head-side hydraulic oil is completely closed. Despite this, the tie bar 23 attempts to move in the direction of the injection device 61. That is, the hydraulic oil on the head side of the mold thickness adjusting hydraulic cylinder 45 is compressed by the thrust acting on the piston 45c from the tie bar 23 via the rod 45a, and the tie bar 23 moves toward the injection device 61 by the amount of the compression. Try to do this. The amount of compression is not constant due to oil temperature, sliding resistance in operation, and the like. However, the hydraulic cylinder 4 for mold thickness adjustment
5, the mechanical stopper 20 is attached to the head side, so that the tip of the mechanical stopper 20 whose position is adjusted according to the thickness of the mold restricts the movement position of the piston 45c toward the head side. Is always constant A at the same mold thickness, and the stop position of the rotating disk 24 is also always constant.

[0025]

[Effects of the Invention] In the present invention, a mechanical stopper is mounted on the head side of the hydraulic cylinder for adjusting the thickness of the mold, so that when the mold clamping force acting on the mold is released and the mold is opened, the mold is adjusted. Although the amount of hydraulic oil compression of the hydraulic cylinder is not constant due to oil temperature, sliding resistance, etc., the amount of movement of the tie bar is always constant, and the stop position of the turntable (the mold opening completion position) is always constant. It will be constant. As a result, there is no obstacle to using a robot or the like for operations such as secondary processing such as insert and outsert and tertiary processing such as hot stamping by rotating the turntable. It has excellent effects of enabling unmanned operation and automation as well as improving the performance of the injection molding machine.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing an embodiment of the present invention.

FIG. 2 is a fragmentary plan view of the main part of the injection molding machine showing a state where the mold is opened.

FIG. 3 is a fragmentary front view of the main part of the injection molding machine showing a state in which the mold is closed.

FIG. 4 is a sectional view taken along the line III-III in FIG. 2;

FIG. 5 is a circuit diagram showing a hydraulic device.

[Explanation of symbols]

 Reference Signs List 20 mechanical stopper 23 tie bar 24 rotary plate 25 moving plate 37 stopper block 38 lock member 44 mold thickness adjusting means 45 mold thickness adjusting hydraulic cylinder 47 first mold opening and closing hydraulic cylinder 48 second mold opening and closing hydraulic cylinder 49 stopper bolt

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixed plate having a plurality of mold clamping cylinder holes fixed on a bed, and a piston portion formed at one end is inserted into each of the mold clamping cylinder holes of the fixed plate. A tie bar extending in parallel, a movable plate movably provided along the tie bar, and a movable plate movably provided along a tie bar between the movable plate and the fixed plate; And a rotating mold plate that forms a second mold clamping portion with the moving plate, and is connected to the rotating plate and the fixed plate, and the rotating plate is fixed to the fixed plate. A first mold opening / closing cylinder that is driven to move in the direction of coming and going, and a second die that is connected to the rotating plate and the moving plate and moves and drives the moving plate in the direction of coming into contact with and separating from the rotating plate.
Mold opening / closing cylinder, connecting means for connecting and disconnecting the moving plate and the tie bar, and an injection device provided outside the fixed plate and the moving plate and provided so as to face each other. In the injection molding machine, a hydraulic cylinder for adjusting the mold thickness is provided at the other end of the tie bar, and a mechanical stopper for restricting the relative movement of the piston of the hydraulic cylinder toward the head is provided on the head side of the hydraulic cylinder for adjusting the mold thickness. Is mounted so as to be movable in the axial direction of the hydraulic cylinder.