JPH10235680A - Nozzle touching mechanism for injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle touching mechanism of a low-cost manufacture by generating a large nozzle touching force by pneumatic drive. SOLUTION: The nozzle touching mechanism comprises a wedge block 44 retractably movable in a perpendicular direction to a moving direction of an injection unit 24, a pneumatic cylinder 46 for moving or retracting the block 44, and wedge supports 41, 43 fixed to the unit 24 side and engaged with the block 44. A thrust force of the cylinder 46 is increased as a nozzle touching force by cooperation of the block 44 and the supports, and a nozzle 25 is pressed to a resin inlet 26 of a hot runner unit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle touch mechanism of an injection molding machine, and more particularly to a nozzle touch mechanism of an injection molding machine improved so that a pneumatic drive source can be employed.

[0002]

2. Description of the Related Art A nozzle touch mechanism of this kind is a mechanism for connecting a nozzle at the tip of an injection section to a hot runner device with a constant force. As a conventional nozzle touch mechanism, there are known a drive method using a hydraulic drive and a drive method using an electric drive. The electric nozzle touch mechanism is used in an injection molding machine that uses a motor instead of a conventional hydraulic cylinder as a drive source for each part of the machine, and presses the nozzle by the thrust of a screw shaft driven by a servo motor. Is what you do. As a prior art of this kind of electric nozzle touch mechanism, there is, for example, Japanese Patent Publication No. Hei 6-17038.

[0003]

The hydraulic drive system generates a large pressing force and can easily maintain a constant pressing force, but cannot be used in an electrically driven injection molding machine. There are cases. In contrast, the electrically driven nozzle touch mechanism keeps the pressing force constant by fixing the position of the advancing nozzle, so that when the brake that fixes the screw shaft slides, the pressing force becomes constant. Difficult to maintain is a major problem.

In addition, as a driving method of the nozzle touch mechanism, a pneumatic method using an air cylinder can be considered. In the case of the pneumatic type, the production cost is low and the holding of the force is easy, but since a large pressing force cannot be generated, the fact is that the nozzle touch mechanism has not been adopted so far.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a nozzle touch mechanism which can solve the above-mentioned problems of the prior art and can generate a large nozzle touch force by pneumatic driving and can be manufactured at low cost. is there.

[0006]

In order to achieve the above object, a nozzle touch mechanism according to the present invention comprises a mold, a hot runner device for supplying molten resin to the mold, and a connection with the hot runner device. And a nozzle touch mechanism of an injection molding machine that presses a nozzle of the injection unit to a resin inlet of the hot runner device in a direction perpendicular to a moving direction of the injection unit. A wedge block, a pneumatic cylinder for moving the wedge block forward and backward, and a wedge receiving portion fixed to the injection section side and fitted with the wedge block, and cooperating with the wedge block and the wedge receiving portion. Thus, the thrust of the pneumatic cylinder is increased as the nozzle touch force, and the nozzle is pressed against the resin inlet of the hot runner device.

According to the nozzle touch mechanism of the present invention, the pressing force generated by the wedge action in which the wedge block and the wedge receiver cooperate becomes a force much larger than the thrust of the air cylinder by the action of the wedge block. Thus, it acts as a force for pressing the tip of the nozzle against the touch surface of the resin inlet. Since the pressing force required for the nozzle touch is generated by the boosting mechanism using the wedge action in this manner, a sufficient nozzle touch force can be generated even with a small-diameter air cylinder, and the position of the wedge block can be reduced. The nozzle touch force can be easily maintained by fixing the.

According to a preferred embodiment of the present invention, the wedge receiving portion is fixed to a surface of the bracket supporting the injection bracket on the side opposite to the hot runner device and has an inclined surface; One end portion is fixed, and the other end portion is supported by the bracket and formed of a guide bar having the receiving portion having a vertical surface at a position facing the inclined plate, and the wedge block includes the inclined plate and It has a corresponding inclined surface and a vertical surface having a shape corresponding to the receiving portion, and is configured to be able to advance and retreat in a direction perpendicular to the guide bar.

In the above-mentioned configuration, in the wedge receiving portion, the wedge block and the receiving portion are slidably contacted by an inclined surface, and the inclined surfaces of the inclined plate and the receiving portion facing each other toward the wedge block. It is preferable to have a slope that widens the interval. With this configuration, even when the contact position of the nozzle with the touch surface changes as a result of thermal deformation, the operation of the wedge block is not disturbed, and sufficient nozzle touch force is generated. Can be done.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a nozzle touch mechanism of an injection molding machine according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a side view of an injection molding machine to which a nozzle touch mechanism according to the present invention is applied. Reference numeral 60 denotes the entire injection device, 10 denotes an injection bracket for supporting an injection screw motor and the like, 12 denotes a hot runner device, and 14 denotes a mold part.

Reference numeral 15 denotes a base of the injection bracket 10,
At both front and rear ends of the machine base 15, brackets 16 and 17 for mounting the injection device 10 are provided upright from the machine base 15. Guide bars 18 and 19 are horizontally hung on the brackets 16 and 17, and the injection bracket 10 is supported by the guide bars 18 and 19.

The machine base 15 is slidably mounted using a guide 21 laid on a base 20 as a guide. 2
Reference numeral 2 denotes an air cylinder that horizontally advances and retracts the entire injection device 60 together with the machine base 15.

The injection portion 24 of the injection device 60 is supported so as to project horizontally from the bracket 16 toward the hot runner device 12. A nozzle 25 is attached to the tip of the injection unit 24. This nozzle 25 is at the same height as the nozzle touch surface 26 which is the inlet of the molten resin supplied to the hot runner device 12, and when the air cylinder 22 operates and the entire injection device 60 moves forward, the nozzle 25 Numeral 25 just joins the nozzle touch surface 26. The capacity of the air cylinder 22 is sufficient as long as it allows the entire injection device 60 to move forward and backward, and the nozzle 25 comes into contact with the nozzle touch surface 26 when moving forward.

The hot runner device 12 includes a hot runner 28 and an air cylinder 29 for pressing the hot runner 28 against a mold. Hot runner 28
Are connected to the upper die 31 attached to the fixed die plate 30.
And a lower mold 32. The lower mold 32 is attached to the movable die plate 33.

Next, a description will be given of a configuration of a nozzle touch mechanism that presses the nozzle 25 against the nozzle touch surface 26 with a large force after the nozzle 25 is joined to the nozzle touch surface 26.

Reference numeral 41 denotes an inclined plate. This inclined plate 41 is used for the hot runner device 1 of the bracket 16.
2 is fixed to the surface on the opposite side to the disposition side. In this case, two inclined plates 41 are provided on the left and right sides, each of which has an inclined surface 42.

Reference numeral 40 denotes two guide bars provided corresponding to the inclined plates 41, respectively. One end of the guide bar 40 is fixed to the hot runner device 12. The other end of the guide bar 40 is a tilt plate 41
Together with this, it constitutes a wedge receiving portion into which the wedge block 44 is fitted, and is supported through the bracket 16 and the inclined plate 41. A receiving portion 43 for receiving the back surface of the wedge block 44 is fixed to an end of the guide bar 40 protruding from the inclined plate 41 so as to face the inclined plate 41. In this embodiment, the front surface of the receiving portion 43 is configured as a vertical surface 45.

The vertical surface 45 of the receiving portion 43 and the inclined plate 4
When the nozzle 25 advances to the nozzle touch surface 26, a space is provided between the inclined surface 42 and the first inclined surface 42 so that the wedge block 44 can be inserted. The inclined surface 42 is inclined so that the thickness of the inclined plate 41 increases downward.

On the other hand, an inclined surface 48 corresponding to the inclined surface 42 is formed in the wedge block 44. In this case, the inclination of the inclined surface 42 is opposite to that of the inclined surface 42. A vertical surface 49 is formed on the opposite side of the inclined surface 48.

FIG. 2 is a view taken in the direction of arrows II-II in FIG. Wedge block 4
The air cylinders 4 and 44 are connected to the air cylinders 46 and 46, and are configured so that the air cylinders 46 and 46 operate to move up and down in the vertical direction. The air cylinder 46 is fixed to the bracket 16 using a stay 47.

Next, the operation of the nozzle touch mechanism configured as described above will be described.

FIG. 3 shows that the injection device 60 advances and the nozzle 2
5 shows a state in which the nozzle 5 touches the nozzle touch surface 26 of the hot runner device 12. While the nozzle 25 moves forward, the wedge block 44 is in the retracted position. When it is detected that the nozzle 25 has contacted the nozzle touch surface 26, the air cylinder 46 operates. As a result, the wedge block 44 is connected to the inclined surface 42 of the inclined plate 41 and the vertical surface 4 of the receiving portion 43.
5 is inserted in the space 50. This space 5
When the wedge block 44 faces 0, the inclined surface 48 contacts the inclined surface of the inclined plate 41, and the vertical surface 49 on the opposite side contacts the vertical surface 45 of the receiving portion 43. When the wedge block 44 further moves forward, the receiving portion 43
While the position is fixed, the wedge block 44 advances while the inclined surfaces 42 and 48 are in contact with each other. Press against the hot runner device 12 side.

The pressing force generated by this wedge action becomes much larger than the thrust of the air cylinder 46 by the action of the wedge block 44, and acts as a force for pressing the tip of the nozzle 25 against the nozzle touch surface 26. As described above, the wedge block 44 and the inclined plate 41 cooperate to generate the pressing force necessary for the nozzle touch by the boosting mechanism utilizing the wedge action, so that the air cylinder is not a hydraulic type but an air cylinder. 46 is sufficient. The movement of the injection device 60 is controlled by another air cylinder 2.
Since the thrust of No. 2 is used, a small diameter air cylinder 46 is sufficient.

At the position where the wedge block 44 is fully advanced, the pressing force of the nozzle 25 is reliably maintained at a constant value, and the pressing force can be easily maintained.

With the nozzle touch state maintained in this way, the molten resin is injected from the nozzle 25 into the molds 31 and 32 via the hot runner 28.

To cancel the nozzle touch state,
The wedge block 44 may be retracted by operating the air cylinder 46 in reverse, and the entire injection device 60 may be retracted by the operation of the air cylinder 22.

Next, another embodiment of the nozzle touch mechanism according to the present invention will be described with reference to FIG. In this embodiment, an inclined surface 52 is formed in the receiving portion 43, and an inclined surface 53 that slides on the inclined surface 52 is also formed in the wedge block 44. The inclined surface 52 is inclined in such a manner that the interval is increased toward the wedge block 44 in relation to the inclined surface 42 of the opposed inclined plate 41.

As the injection cycle of the molten resin is continued, the nozzle 25 that becomes hot becomes thermally deformed, and as a result, the contact position with the nozzle touch surface 26 changes.
When the contact position is slightly shifted to the right side from the normal position, the wedge block 44 cannot enter between the inclined plate 41 and the receiving portion 43 in the receiving portion 43 of FIG. By providing the inclined surface 52 to the receiving portion 43, even if there is a slight change in the position, the wedge block 44
Operation is not hindered, and a sufficient nozzle touch force can be generated.

[0029]

As is apparent from the above description, according to the present invention, a wedge block capable of moving back and forth in a direction perpendicular to the moving direction of the injection unit, a pneumatic cylinder for moving the wedge block forward and backward, and the injection A wedge receiving portion fixed to the side of the wedge block, the wedge block is fitted with the wedge block. The thrust of the pneumatic cylinder is increased as a nozzle touch force by the cooperation of the wedge block and the wedge receiving portion, and the nozzle is hot. Since the resin is pressed against the resin inlet of the runner device, the boosting mechanism using the wedge action can generate sufficient pressing force necessary for nozzle touch even by the pneumatic drive method, and the position of the wedge block. The nozzle touch force can be easily maintained by fixing the.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of an injection molding machine to which a nozzle touch mechanism according to the present invention is applied.

FIG. 2 is a view of the nozzle touch mechanism taken along the line II-II of FIG. 1;

FIG. 3 is a diagram illustrating a position of a nozzle touch mechanism when a nozzle contacts a nozzle touch surface of a hot runner device.

FIG. 4 is a diagram showing a wedge action of a nozzle touch mechanism when a nozzle is pressed against a nozzle touch surface.

FIG. 5 is a diagram showing another embodiment of the nozzle touch mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection apparatus 12 Hot runner device 14 Mold part 24 Injection part 25 Nozzle 26 Nozzle touch surface 28 Hot runner 30 Fixed die plate 31 Upper die 32 Lower die 40 Guide bar 41 Inclined plate 42 Inclined surface 43 Receiving portion 44 Wedge block 48 Inclined surface

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 4, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a nozzle touch mechanism of an injection molding machine according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a side view of an injection molding machine to which a nozzle touch mechanism according to the present invention is applied. Reference numeral 60 denotes the entire injection device, 10 denotes an injection bracket for supporting an injection screw, 12 denotes a hot runner device, and 14 denotes a mold part.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Reference numeral 15 denotes a base of the injection bracket 10,
At both front and rear ends of the machine base 15, brackets 16 and 17 for mounting the injection bracket 10 are vertically provided from the machine base 15. Guide bars 18 and 19 are horizontally hung on the brackets 16 and 17, and the injection bracket 10 is supported by the guide bars 18 and 19.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

Reference numeral 40 denotes two guide bars provided corresponding to the inclined plates 41, respectively. One end of the guide bar 40 is fixed to the hot runner device 12. The other end of the guide bar 40 is
1. Together with the receiving portion 43, it constitutes a wedge receiving portion into which the wedge block 44 is fitted, and is supported by penetrating the bracket 16 and the inclined plate 41. Inclined plate 4
At the end of the guide bar 40 protruding from the first plate 1, a receiving portion 43 for receiving the back surface of the wedge block 44 is provided with the inclined plate 41.
And is fixed so as to face. In this embodiment,
The front surface of the receiving portion 43 is configured as a vertical surface 45.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

DESCRIPTION OF SYMBOLS 10 Injection bracket 12 Hot runner device 14 Mold part 24 Injection part 25 Nozzle 26 Nozzle touch surface 28 Hot runner 30 Fixed die plate 31 Upper die 32 Lower die 40 Guide bar 41 Inclined plate 42 Inclined surface 43 Receiver 44 Wedge block 48 Inclined surface

Claims (3)

[Claims] 1. A mold, a hot runner device for supplying a molten resin to the mold, and an injection portion of an injection device connected to the hot runner device, wherein the hot runner device has a resin inlet portion. In a nozzle touch mechanism of an injection molding machine that presses a nozzle of an injection unit, a wedge block that can move forward and backward in a direction perpendicular to a moving direction of the injection unit, a pneumatic cylinder that moves the wedge block forward and backward,
A wedge receiving portion fixed to the injection portion side and fitted with the wedge block, wherein the thrust of the pneumatic cylinder is increased as a nozzle touch force by cooperation of the wedge block and the wedge receiving portion; A nozzle touch mechanism of an injection molding machine, wherein the nozzle is pressed against a resin inlet of a hot runner device. 2. An inclined plate having an inclined surface fixed to a surface of the bracket supporting the injection bracket on the side opposite to the hot runner device, wherein the wedge receiving portion has one end fixed to the hot runner device. A guide bar having an end portion penetratingly supported by the bracket and having the receiving portion having a vertical surface at a position facing the inclined plate; and the wedge block includes an inclined surface corresponding to the inclined plate and the receiving portion. The nozzle touch mechanism of an injection molding machine according to claim 1, wherein the nozzle touch mechanism has a correspondingly shaped vertical surface and can move forward and backward in a direction perpendicular to the guide bar. 3. The wedge receiving portion, wherein the wedge block and the receiving portion are in sliding contact with each other by an inclined surface, and the opposing inclined surfaces of the inclined plate and the receiving portion are widened at an interval toward the wedge block. 3. The device according to claim 2, wherein the device has a slope.
4. A nozzle touch mechanism for an injection molding machine according to claim 1.