JP3574994B2 - Die attachment / detachment device for injection molding machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mold attaching / detaching device in an injection molding machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an apparatus for attaching and detaching a mold in an injection molding machine, there is one described in, for example, JP-A-8-1676. As shown in FIGS. 9 and 10, a conventional injection molding machine 50 includes a base board 51, and a movable mold 52 and a fixed mold 53 are provided on the base board 51. The movable mold 52 is fixed to the movable base 54 and moves in the left-right direction in FIG. One fixed mold 53 is fixed to a fixed base 55.
As shown in FIG. 10, the movable mold 52 is fixed to the movable base 54 with its upper end restrained by auto clampers 56, 56. On the other hand, although not shown, the lower end of the movable mold 52 is similarly restrained and fixed by the auto clamper. As a result, the movable mold 52 is automatically clamped by the auto clampers 56 and 56 (two lower parts are not shown). And is fixed to the movable base 54 at four positions. Further, the fixed mold 53 is fixed to the fixed base 55 by being restrained at four places by a similar auto clamper (not shown). Further, below the movable mold 52 and the fixed mold 53, transfer rollers 57, 57 used for carrying out the molds 52, 53 are provided. The transfer rollers 57 extend in a direction perpendicular to the moving direction of the movable mold 52.
On the other hand, an opening / closing cylinder 58 and a support board 59 to which the opening / closing cylinder 58 is attached are provided on the opposite side (the left side in FIG. 9) of the movable side base 54 to the side where the movable mold 52 is fixed. Guide rods 60A, 60B, and 60C (see FIG. 10; one is not shown) penetrate through the four corners of the movable base 54, and slide below the movable base 54. A rail 61 is provided. The movable base 54 can move along the guide bar 60 and the slide rail 61 by the expansion and contraction of the open / close cylinder 58. On the other hand, a kneading device 62 having a mixer 62A is provided on a side of the fixed base plate 55 opposite to the side on which the fixed mold 53 is fixed. Further, an injection nozzle 63 for injecting the resin kneaded by the kneading device 62 into the cavities of the molds 52 and 53 is provided. Below the injection nozzle 63, the injection nozzle 63 is applied to the fixed base 55. An operating cylinder 64 to be brought into contact is provided. Reference numeral 65 denotes an injection cylinder used when injecting the resin.
[0003]
The operation of the injection molding machine 50 will be described. First, the movable base 54 is moved on the slide rail 61 while being slid on the guide rod 60 by the opening / closing cylinder 58 and pressed against the fixed base 55. Then, the opening / closing cylinder 58 is extended to bring the dies 52 and 53 into a clamped state. Next, the injection nozzle 63 is brought into contact with the fixed base 55 by the operating cylinder 64. Subsequently, the resin kneaded by the kneading device 62 is injected into the cavities of the molds 52 and 53 to perform injection molding of the resin molded product.
[0004]
When the molds 52 and 53 are replaced with new molds after the end of the injection molding, the molds 52 and 53 are released from the constraints by the auto clampers 56 and 56 (see FIG. 10), and the molds 52 and 53 are released. 53 is removed from the bases 54, 55. Then, the dies 52, 53 are moved by the transfer rollers 57, 57 in a direction orthogonal to the moving direction of the movable mold 52, and are transferred onto the rollers 71, 71 of the transfer table 70 laid horizontally on the injection molding machine 50. It is carried out, a new mold is carried in, and fixed to the base plates 54 and 55. However, when the molds 52 and 53 are carried out, when the molds 52 and 53 are clamped, the molds 52 and 53 cannot be carried out because the friction between the molds 52 and 53 is too large. .
Therefore, the movable base 54 is slightly moved away from the fixed base 55 by, for example, about 10 mm by the opening / closing cylinder 58, and the carry-out operation is performed in a state where a slight gap is formed between the movable base 54 and the movable mold 52. ing.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional attachment / detachment device 50, when carrying out the work of the dies 52, 53, the carry-out work is usually performed semi-automatically by the operation of the operator. When the opening / closing cylinder 58 is finely operated when the molds 52 and 53 are carried out, the movable base 54 is moved too much due to malfunction of a hydraulic valve (not shown) in the opening / closing cylinder 58 or a trouble in an electric system. There is.
[0006]
If the movable base 54 is moved too much, the dies 52 and 53 may be tilted and not properly placed on the transfer roller 57, and may fall off and be damaged.
[0007]
Therefore, an object of the present invention is to prevent the mold from falling and being damaged by falling down when the mold in the injection molding machine is replaced, as a result of the mold being tilted. It is in.
[0008]
[Means for Solving the Problems]
The present invention that has solved the above problems includes a movable mold and a fixed mold, and includes a clamp unit that fixes the movable mold and the fixed mold to the movable base and the fixed base, respectively. The movable mold and the fixed mold are, at the time of replacement, a mold attaching / detaching device in an injection molding machine that is carried out in a direction orthogonal to the moving direction of the movable mold,
Each of the movable mold and the fixed mold is provided with a support device for preventing the mold from tilting when released from the restraint by the clamp means,
The support device is swingable about a horizontal axis along the moving direction of the movable mold, and usually hangs down by its own weight to lock the upper ends of the movable mold and the fixed mold. It has a supporting claw.
ADVANTAGE OF THE INVENTION According to this invention, when replacing | exchanging the metal mold | die in an injection molding machine, it can prevent that a metal mold falls, and as a result, a metal mold does not fall and is damaged. .
[0009]
Preferably, the apparatus further comprises a proximity sensor for detecting that the supporting claw is hanging.
In this way, by providing the proximity sensor that detects that the support claw is hanging, it is possible to make it impossible to perform the mold replacement work when the support device is not supporting the mold. It is. Therefore, the mold replacement operation can be performed safely.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is an overall side view of an injection molding machine provided with an attachment / detachment device according to the present invention, and FIG. 2 is a perspective view of a mold attachment / detachment device in the injection molding machine.
[0011]
As shown in FIGS. 1 and 2, an injection molding machine S including a detachable device according to the present invention includes a base plate 1, and a movable die 2 and a fixed die 3 are provided on the base plate 1. . The movable mold 2 is fixed to the movable base 4, and the fixed mold 3 is fixed to the fixed base 5. On the upper surface of the movable mold 2, as shown in FIG. 2, an auto-joint stay 2B for supplying electricity to the lifting yokes 2A and 2A used for suspending and moving the movable mold 2 and the cavity of the mold. Is provided. Further, a locking piece 2C is formed at a position on the upper surface of the movable mold 2 which is in close contact with the movable base 4. A lifting yoke 3 </ b> A (one not shown) is also provided on the upper surface of one fixed mold 3, and a locking piece (not shown) is formed at a position close to the fixed base 5.
[0012]
As shown in FIG. 2, the movable mold 2 is fixed to the movable base 4 at its upper end by auto clampers 6 and 6 as clamping means. On the other hand, although not shown, the lower end of the movable mold 2 is also restrained and fixed by an auto clamper in the same manner. As a result, the movable mold 2 has four auto clampers 6, 6 (two lower parts are shown in the drawing). ) Is fixed to the movable base 4.
[0013]
Further, the fixed mold 3 is also fixed to the fixed base 5 by being restrained at four places by an auto clamper (not shown) similar to the auto clamper 6 for fixing the movable mold 2. Further, below the movable mold 2 and the fixed mold 3, transfer rollers 7, 7 used for carrying out the molds 2, 3 are provided. The transfer rollers 7 extend in a direction orthogonal to the moving direction of the movable mold 2. Further, in the present embodiment, the support device 8 for preventing the movable mold 2 and the fixed mold 3 from tilting when released from the restraint by the auto clampers 6, 6. , 8 (the fixed mold 3 side is not shown).
On the other hand, an opening / closing cylinder 9 and a support plate 10 to which the opening / closing cylinder 9 is mounted are provided on the opposite side (left side in FIG. 1) of the movable side base 4 to the side where the movable mold 2 is fixed. Guide rods 11A, 11B, and 11C (see FIG. 2; one is not shown) penetrate through the four corners of the movable base 4 and slide below the movable base 4. A rail 12 is provided. The movable base 4 can move along the guide rod 11 and the slide rail 12 by the expansion and contraction of the opening / closing cylinder 9. On the other hand, a kneading device 62 and the like are provided on the fixed side base 5 on the side opposite to the side on which the fixed mold 3 is fixed, and a transfer table 70 is provided laterally on the side of the injection molding machine S. ing. Since the kneading device 62 and the transfer table 70 have the same configuration as the conventional one, they are assigned the same numbers and their explanation is omitted.
[0014]
Next, the configuration of the auto clamper 6 used here will be described by taking one of those provided on the movable base 4 as an example.
3 is a side view of the auto clamper, FIG. 4 is a plan view thereof, and FIG. 5 is a perspective view thereof. As shown in FIG. 4, an operating cylinder 22 shown in FIGS. 3 to 5 is disposed in a hole 21 formed in the movable side base 4. A forked portion 23A is formed. An operating rod 24 is sandwiched between the forked portions 23A, and is rotatably supported by a pin member 25. A guide rod 26 is disposed at a middle portion of the operation rod 24 at right angles to the operation rod 24 in plan view via a fixing member 26A, and a pressing member 27 is disposed at a tip of the operation rod 24. I have. The movable mold 2 is fixed to the movable base 4 by pressing the movable mold 2 against the movable base 4 with the pressing member 27.
On the other hand, guide members 28, 28 are disposed inside the hole 21, and cam grooves 29, 29 in which the guide rods 26 are fitted are formed on the surfaces of the guide members 28, 28 facing each other. Is established. Therefore, the guide rod 26 can move along the cam grooves 29, 29.
[0015]
Next, the configuration of the support device 8 will be described. FIG. 6 is an enlarged perspective view of one of the support devices 8 in the movable base 4, and FIG. 7 is a side sectional view thereof. As shown in FIGS. 2, 6, and 7, the support device 8 includes a base 31 fixed to the movable base 4. A bearing 32 is fixed to a central portion of the base 31 by bolts 31A, 31A,..., And a hook-shaped support plate 33 is fixed to an upper end of the base 31 by bolts 31B, 31B. . The support plate 33 has a horizontal portion 33A extending forward, and a hanging portion 33B descending downward from the tip of the horizontal portion 33A. A bearing 33C is fixedly mounted on the surface of the hanging portion 33B, and a bolt 34 is attached to the surface.
[0016]
Between the bearings 32 and 33, a supporting claw 35 is pivotally supported so as to be swingable about a horizontal axis along the moving direction of the movable mold 2 (the X direction in FIGS. 2 and 6). As shown in FIGS. 6 and 7, the support claw 35 has a rotating body portion 35A and a locking portion 35B. Projections 35C and 35D held by bearings 32 and 33 are integrally fixed to both ends of the rotating body 35A. Of these, the projection 35C is fitted to the bearing 32, and the projection 35D is fitted to the bearing 33C and fastened by the bolt 34. By disposing these projections 33C and 33D along the horizontal axis, the support claw 35 can swing freely around the horizontal axis.
The support claw 35 hangs down by its own weight at all times, that is, when the molds 2 and 3 are not replaced. Further, a notch 35a for securely locking the dies 2 and 3 is formed on the back side of the support claw 35.
[0017]
On the other hand, the support device 8 is provided with a proximity sensor 40. The proximity sensor 40 has a detection rod 41 attached to the support claw 35 and a proximity switch 42 attached to the hanging portion 33B of the support plate 33. The proximity switch 42 is provided with a contact 43 that is kicked by the contact portion 41a of the detection rod 41 when the support claw 35 swings. Then, the proximity sensor 40 detects whether the support claw 35 is in a hanging state. The proximity sensor 40 is connected to a driving device (not shown) of the opening / closing cylinder 9 via a wiring (not shown), and unless the proximity sensor 40 detects that the supporting claw 35 is hanging down. The drive device of the opening / closing cylinder 9 is configured not to operate.
[0018]
Next, the operation of the injection molding machine S having the above configuration will be described.
Before starting the injection molding, the movable side base 4 is moved on the slide rail 12 while being slid on the guide rod 11 by operating the opening / closing cylinder 9 shown in FIG. Then, the opening / closing cylinder 9 is operated to the extension end to bring the molds 2 and 3 into the mold clamped state. Next, the injection nozzle 63 is brought into contact with the fixed base 5 by the operation cylinder 64. Subsequently, the resin kneaded by the kneading device 62 is injected into the cavities of the molds 2 and 3 to perform injection molding of a resin molded product. The injection molding process so far is the same as that of the conventional injection molding machine 50.
[0019]
After the end of the injection molding, the dies 2 and 3 may be replaced with new dies. In this case, first, the dies 2 and 3 are released from the restraint by the auto clampers 6 and 6, and the dies 2 and 3 are removed from the bases 4 and 5. The operation at this time will be described. When the rod 23 of the working cylinder 22 in the auto clamper 6 shown in FIGS. 4 to 6 is extended, the working rod 24 is pushed out to the fixed mold side (the right side in FIG. 4), and the guide rod 26 is pushed out in the same direction. The guide rod 26 extruded in the same direction moves along the cam grooves 29, 29 because both ends thereof are fitted into the cam grooves 29, 29 of the guide members 28, 28, respectively. Accordingly, as shown by the imaginary line in FIG. 4, the distal end of the operating rod 24 is pushed upward and forward along the cam grooves 29, 29, and with this movement, the pressing member 27 is also pushed upward and forward. Thus, the constraints on the dies 2 and 3 by the auto clampers 6 and 6 are released.
[0020]
Next, in order to eliminate friction between the dies 2 and 3, the movable base 4 is moved away from the fixed base 5 by an opening / closing cylinder 9 by about 10 mm, and a slight gap is formed between the movable base 4 and the movable mold 2. Form a gap. At this time, there is a possibility that the upper portions of the dies 2 and 3 may be inclined due to malfunction of the opening / closing cylinder 9 or the like, but in the present embodiment, the locking pieces 2C of the dies 2 and 3 (the fixed Since the support claws 35 of the support members 8 and 8 are locked (the sides are not shown), the molds 2 and 3 can be prevented from tilting. Further, in the present embodiment, two supporting devices 8 are provided symmetrically with respect to the dies 2 and 3, respectively, so that the dies 2 and 3 can be stably stood and endure a large weight. Can be supported.
[0021]
After that, the dies 2 and 3 are moved in the direction of the transfer table (see FIG. 2) 70 and carried out. At this time, the dies 2 and 3 are released from the clamped state, and the friction between the dies 2 and 3 is eliminated, so that the dies 2 and 3 can be smoothly carried out. On the other hand, when carrying out the unloading operation, the lifting yokes 2A, 3A and the auto-joint stay 2B provided on the upper surfaces of the dies 2, 3 hit the support member 8, but the support claws 35 of the support member 8 Since it is held by 33 and swings around the horizontal axis, the support claws 35 do not hinder the unloading operation.
The operation at this time will be described by taking the unloading work of the movable mold 2 as an example. As shown in FIG. 8, first, the unloading work of the movable mold 2 is started in FIG. (Z direction in FIG. 8). In this state, the auto joint stay 2B has not yet contacted the support member 8. When the carry-out of the movable mold 2 is continued as it is, the auto joint stay 2B eventually hits the support claw 35 of the support member 8. Then, as shown in FIG. 8B, the support claws 35 swing around the horizontal axis and escape. For this reason, although the auto joint stay 2 </ b> B hits the support claws 35, it does not hinder the unloading operation of the movable mold 2. When the auto joint stay 2B passes by the position of the support member 8, the support claw 35 of the support member 8 returns to a state of being suspended by its own weight, as shown in FIG. 8C. Thereafter, although not shown, the same operation is performed when the lifting yoke 2A passes the position of the support member 8. The same operation is performed between the lifting yoke 3A of the fixed mold 3 and a support member (not shown) attached to the fixed base 5.
Thus, the unloading work of the dies 2 and 3 is completed.
[0022]
By the way, when the above-described unloading work of the dies 2 and 3 is performed when the support claws 35 of the support member 8 are not in a hanging state, the work is performed in the same state as when the support member 8 is not provided. become. Therefore, there is still a concern that the molds 2 and 3 may be tilted and dropped due to malfunction of the opening / closing cylinder 9 or the like. Therefore, in the present embodiment, a proximity sensor 40 for detecting whether the support claw 35 is in a hanging state is provided, and the proximity sensor 40 is opened and closed unless the proximity sensor 40 detects that the support claw 35 is in a hanging state. The driving device (not shown) of the cylinder 9 is configured not to operate. Therefore, when the support claws 35 do not hang down, in other words, when the support device 8 does not support the upper ends of the dies 2 and 3, the opening / closing cylinder 9 cannot be driven. . Therefore, when the supporting device 8 does not support the dies 2 and 3, the dies 2 and 3 cannot be replaced, so that the dies 2 and 3 are prevented from tilting or falling. You can work safely.
[0023]
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment. For example, although two support devices are provided for each mold, one or three or more support devices may be provided depending on the shape of the mold. In addition, a bearing mechanism is provided to allow the support claw to swing freely. Instead of this bearing mechanism, a through-hole is formed in the rotating body of the support claw along a horizontal axis, and penetrates the through-hole. The support shaft may be provided between the hanging portion of the support plate and the base.
On the other hand, although the proximity sensor is provided for safety, a sensor without the proximity sensor is also included in the present invention. Further, although the contact type is used as the proximity sensor, a non-contact type proximity sensor may be used. The point is that it is only necessary to detect that the support claw is hanging. In addition, the term “supporting claws are hanging” in the present invention does not mean that the tips of the supporting claws face directly below, but are hanging down to the extent that the supporting claws can lock the mold. It means that.
[0024]
【The invention's effect】
As described above, according to the present invention, when exchanging a mold in an injection molding machine, the mold is prevented from falling on the transfer roller due to tilting, thereby preventing the mold from falling and being damaged. It is possible to do. Further, it is possible to safely perform the mold replacement operation.
[Brief description of the drawings]
FIG. 1 is an overall side view of an injection molding machine provided with a detachable device according to the present invention.
FIG. 2 is a perspective view of a mold attaching / detaching device in the injection molding machine according to the present invention.
FIG. 3 is a side view of the auto clamper.
FIG. 4 is a plan view of an auto clamper.
FIG. 5 is a perspective view of an auto clamper.
FIG. 6 is a perspective view of one of the support devices on the movable base.
FIG. 7 is a side sectional view of one of the support devices on the movable base.
FIG. 8 is an operation diagram showing the operation of one of the support devices in the movable base plate from the front.
FIG. 9 is a side view of a conventional injection molding machine.
FIG. 10 is a perspective view of a mold attaching / detaching device in a conventional injection molding machine.
[Explanation of symbols]
Reference Signs List 1 base board 2 movable mold 3 fixed mold 4 movable side base 5 fixed side base 6 auto clamper (clamping means)
8 Supporting device 31 Base 32 Bearing 33 Support plate 33C Bearing 35 Supporting claw 35A Rotating body 35B Locking portions 35C, 35D Projection (horizontal axis)
40 proximity sensor 41 detection rod 42 proximity switch 43 contactor S injection molding machine

Claims (2)

The movable mold and the fixed mold are provided, and the movable mold and the fixed mold are provided with clamping means for fixing the movable mold and the fixed mold to the movable base plate and the fixed base plate, respectively. At the time of replacement, a mold attaching / detaching device in an injection molding machine carried out in a direction orthogonal to a moving direction of the movable mold,
Each of the movable mold and the fixed mold is provided with a support device for preventing the mold from tilting when released from the restraint by the clamp means,
The support device is swingable about a horizontal axis along a moving direction of the movable mold, and usually hangs down by its own weight to lock upper ends of the movable mold and the fixed mold. A mold attaching / detaching device in an injection molding machine having a supporting claw. 2. The apparatus according to claim 1, further comprising a proximity sensor that detects that the support claw is hanging. 3.

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