KR100707672B1 - Molding ejecting device of mold clamping device - Google Patents

Abstract

The present invention relates to a separation device for separating the finished molded product from the clamping mechanism of the toggle link injection machine. The separating device according to the present invention includes an ejector pin 20 which is installed to move to the moving plate 7 and a driving means for moving the ejector pin 20. The ejector pin 20 is made of a hard part 21 made of a hard material installed to penetrate the movable plate 7 so as to be linearly movable, and is connected to the rear end of the hard part 21 and has a multi-joint structure that can be flexibly bent. The flexible part 22 is provided. The flexible part 22 extends in the direction perpendicular to the moving direction of the hard part 21, and the hard part 21 is turned in the same direction as the moving direction of the hard part 21 by the driving means. And the hard part 21 protrudes from the front of the moving plate 7 to separate the molded product. According to such a separating device, since the space required for installing the driving means for driving the ejector pin 20 is smaller than in the related art, the width d of the moving plate 7 can be minimized.

Injection, Molding, Toggle, Link, Clamping Device, Molded Parts, Separation

Description

Molding Ejecting Device of Mold Clamping Device

1 shows a general clamping mechanism;

2 is a view showing a conventional molded article separating device.

Figure 3 is a side cross-sectional view of the molded article separating apparatus according to an embodiment of the present invention.

Figure 4 is a view showing a state in which the separation device of Figure 3 viewed from the back side of the moving plate.

5a and 5b is a view showing the operation of the molded article separating apparatus of FIG.

<Explanation of symbols for the main parts of the drawings>

4: fixed plate 6: rear plate

7: moving plate 8: short link

9: long link 11: cross head

14 motor 15 ball screw

16: ball nut 20: ejector pin

21: hard part 22: flexible part

31: Bobbin 40: Guide

The present invention relates to a clamping mechanism of a toggle injection molding machine using a toggle link, and more particularly, to a separating device capable of separating a molded product from the clamping mechanism.

Toggle injection molding machine clamping mechanism is a mechanism for applying the clamping force to the pair of the template mounted between the moving plate and the fixed plate through the tie bar to perform the injection operation. According to the number of toggle links, the mold clamping mechanism of the toggle injection molding machine can be divided into a single toggle clamping mechanism composed of a pair of toggle links, and a double toggle clamping mechanism composed of two pairs of toggle links. Single toggle clamping mechanisms are suitable for compact injection molding machines, and double toggle clamping mechanisms are suitable for injection molding machines requiring relatively large clamping forces. In addition, the double toggle type clamping mechanism may be classified into a four-point type, a five-point type, or a six-point type clamping mechanism according to the difference in the installation method of the crosshead link for the toggle link.

Examples of conventional four-point, five-point and six-point clamping mechanisms are disclosed in Korean Patent Registration No. 522396 (October 19, 2005) and Patent Registration No. 522397 (October 19, 2005). have. As disclosed in these publications, the four-point clamping mechanism operates with four nodes with a toggle link, the five-point clamping mechanism operates with five nodes, and the six-point clamping mechanism has six nodes.

Figure 1 shows a typical five-point clamping mechanism. As shown in FIG. 1, in this clamping mechanism, a rear plate 6 and a fixed plate 4 are installed on both sides of the tie bar 5, and a moving plate 7 is disposed therebetween, and a moving plate. (7) is connected to the rear plate (6) via the long links (9) and the short links (8) disposed between the nodes (C, A, and B). The servo motor 14 and the ball screw 15 are installed on one side of the rear plate 6, and the cross head 11 is coupled to the ball screw 15 so as to be linearly movable through the ball nut 16. The crosshead link 12 connected to the head 11 is connected to the short link 8 at node E. Between the moving plate 7 and the fixed plate 4, a pair of template | molds M1 and M2 which comprise a metal mold | die are arrange | positioned.

In such a clamping mechanism, when the ball screw 15 rotates by the servomotor 14, the crosshead 11 makes linear motion. When the crosshead 11 advances to the right in the drawing, the short link 8 and the long link 9 are extended to move the movable plate 7 relatively, so that the movable plate 7 and the fixed plate 4 are close to each other. As a result, the pair of templates M1 and M2 abut each other to close the mold.

In this state, when the injection molding is completed by the boosting step and the injection step, the servo motor 14 rotates the ball screw 15 in the opposite direction, so that the moving plate 7 backwards to open the mold.

As shown in Fig. 2, the moving plate 7 is provided with a separating device for separating the injection molded articles attached to the templates M1 and M2. The separator used in the related art has an ejector pin 17 which moves linearly by a separate driving source (not shown), such as a motor or a cylinder, so that the ejector pin 17 moves according to the driving of the driving source. The ones in which the injection molded product is separated from the template M1 by protruding through the template M1 on the plate 7 side have been used.

By the way, in the conventional separation device, the drive source is installed in parallel with the direction of movement of the ejector pin 17, and the power transmission from the drive source to the ejector pin 17 is also parallel to the direction of movement of the ejector pin 17. A large space is required for installing the drive source in the longitudinal direction of the mechanism. Thereby, since the width d of the moving plate 7 must be increased, there is a problem that the overall size of the mold clamping mechanism increases. Further, due to the increase in the width d of the moving plate 7, the length from the node C to the front of the moving plate 7 becomes long, and a large moment is applied to the moving plate 7 during the step of increasing the pressure. There was also a problem that 7) could be transformed.

The present invention was developed to solve the above problems, by separating the molded part of the clamping mechanism to minimize the width of the moving plate by allowing the power transmission between the ejector pin and the drive source is made perpendicular to the moving direction of the ejector pin. It is an object to provide a device.

An object of the present invention as described above, the ejector pin is formed so as to move to the moving plate and the molding device of the molding mechanism comprising a drive means for moving the ejector pin, the ejector pin is connected to the moving plate Flexible part made of a rigid material installed to penetrate linearly, and connected to the rear end of the hard part and flexible to bend, extending from the back side of the moving plate in a direction perpendicular to the moving direction of the hard part And a flexible part, wherein the flexible part is pushed and moved by the hard part while moving in the same direction as the moving direction of the hard part by driving of the driving means.

Here, the driving means, the flexible portion is wound around the outer periphery, the bobbin rotates in a direction parallel to the direction of movement of the hard portion, and a motor for rotating the bobbin, the flexible portion is the rotation of the bobbin As a result, it is released from the bobbin and moved in the direction of the hard part.

In addition, the molded article separating apparatus according to the present invention, one end is extended in the same direction as the moving direction of the hard portion, the other end is extended in the tangential direction and the rotation direction of the bobbin, the flexible when the flexible part is released from the bobbin It may further include a guide for guiding the portion to move toward the hard portion. And, the flexible portion may be made of a multi-joint structure.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 3 is a side cross-sectional view of the molded article separating apparatus according to an embodiment of the present invention, Figure 4 is a view showing a state viewed from the back side of the moving plate.

The molded article separating device according to the present invention is applied to the general clamping mechanism shown in FIG. 1, and the same reference numerals as in FIG. That is, in FIG. 3 and FIG. 4, reference numeral 7 denotes a moving plate of the clamping mechanism, and reference numeral M1 denotes a template M1 coupled to the moving plate 7 side.

As shown in FIG. 3, the molded article separating device has a pair of ejector pins 20 installed through the moving plate 7. When molding of the molded article is completed in the clamping mechanism, the ejector pin 20 moves linearly to the right in FIG. 3 so that its tip sticks to the mold M1 by protruding from the front surface (right side in FIG. 3) of the moving plate 7. Push out the molded part to separate it.

Each ejector pin 20 is composed of a hard part 21 having a pin shape of a hard material, and a flexible part 22 connected to the rear end of the hard part 21 and having a structure that can be flexibly bent. The hard part 21 is inserted into a hole 19 formed through the moving plate 7 in the horizontal direction, and the flexible part 22 forms the angle of about 90 degrees with the hard part 21 at the rear end of the straight part 21. Extends vertically from.

The flexible part 22 has a multi-joint structure, that is, a structure in which a plurality of segmented hard nodes are connected with a flexible material such as a rubber band, thereby resisting a force applied in the longitudinal direction as with the hard part 21 in the unfolded state. You can do it. On the other hand, the structure of the flexible portion 22 is not limited to this, if it is a structure that can be flexibly bent while receiving a force in a straight direction, for example, a structure such as a chain (chain) may be used.

As shown in FIG. 4, the flexible part 22 is installed in a state wound around the bobbin 31 rotatably installed on the rear side of the moving plate 7, and is unwinded according to the rotation of the bobbin 31. The hard part 21 is pushed out so that the hard part 21 makes a linear motion through the hole 19 of the moving plate 7. The bobbin 31 is provided so as to rotate the axis in the direction parallel to the moving direction of the hard part 21.

In order to convert the rotational motion of the bobbin 31 into the linear motion of the hard part 21, a guide 40 is provided on the rear surface of the moving plate 7 to move the flexible part 22 toward the hard part 21. Is installed. The guide 40 has the shape of an elbow. One end of the guide 40 extends in the horizontal direction in parallel with the hard part 21 (see FIG. 3), and the other end extends in parallel with the tangential direction of the upper end of the bobbin 31 (see FIG. 4). Therefore, when the bobbin 31 rotates, the flexible portion 22 is released and enters the hole 19 from the rear side of the movable plate 7 along the guide 40, whereby the hard portion 21 is moved. It is pushed out and protrudes to the front surface of the moving plate 7 to push and separate the molded article attached to the template M1.

On the other hand, the bobbin 31 is rotationally driven by a motor (not shown). In the present embodiment, a pair of ejector pins 20, 20 which are symmetrical up and down is provided, so that a pair of bobbins 31, 31 are required to move them. These pairs of bobbins 31 and 31 are driven simultaneously by one motor. To this end, driven gears 32 and 32 are coupled to bobbins 31 and 31, respectively, and driven gears 32 and 32 mesh with one drive gear 33 at the same time. Then, the drive gear 33 is connected to the motor. Therefore, when the drive gear 33 is rotated by the driving of the motor, the pair of bobbins 31 and 31 simultaneously rotate in the same direction to move the ejector pin 20.

Hereinafter, the operation of the molded article separating apparatus of the present invention will be described in more detail with reference to FIGS. 5A and 5B.

Fig. 5A shows a state immediately after injection molding of a molded article is completed in the clamping mechanism. When the injection molding of the molded article is completed, the moving plate 7 is moved backwards so that the pair of templates M1 and M2 (see FIG. 1) are separated from each other to open the mold. In this state, as shown in FIG. 4, when the drive gear 33 rotates by driving the motor, a pair of driven gears 32 and 32 and bobbins 31 and 31 engaged with the drive gear 33 are rotated. Rotate in the same direction.

As the bobbin 31 rotates, as shown in FIG. 5B, the flexible part 22 of the ejector pin 20 is released from the bobbin 31 and the hole of the movable plate 7 is guided by the guide 40. Guided (19) and pushed in. Accordingly, the hard part 21 of the ejector pin 20 moves linearly to the left in the drawing so that its tip protrudes from the front surface of the moving plate 7. The front end of the hard part 21 of the ejector pin 20 penetrates through the template M1 coupled to the front surface of the moving plate 7 to push the molded article attached to the template M1 so that the molded article is separated.

In this embodiment, since the bobbin 31 wound around the flexible part 22 of the ejector pin 20 is rotated about an axis parallel to the moving direction of the hard part 21, the flexible part 22 is viewed from the side. While moving in the vertical direction is rotated 90 degrees by the guide 40 to move the hard portion 21 linearly while moving in the horizontal direction. That is, in the present invention, the power transmission from the motor which is the driving source to the ejector pin 20 is perpendicular to the moving direction of the ejector pin 20. Therefore, as compared with the related art, since the space required for installation of the components for driving the ejector pin 20 becomes smaller, the width d of the moving plate 7 can be minimized.

As described above, according to the present invention, since the width of the moving plate can be reduced, the size of the entire mold clamping mechanism can be reduced. In addition, by reducing the width of the moving plate, it is possible to reduce the moment applied to the moving plate during the step-up process to prevent deformation of the moving plate.

In the above, certain preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. will be.

Claims (4)

A molded article separating device of a clamping mechanism including an ejector pin (20) installed on the moving plate (7) so as to move outwardly, and a driving means for moving the ejector pin (20), The ejector pin 20 is connected to the hard part 21 of the hard material and installed to penetrate the movable plate 7 so as to be linearly movable, and has a structure that can be flexibly bent. It is provided with a flexible portion 22 which extends in the direction perpendicular to the moving direction of the hard portion 21 on the back side of the moving plate (7), The flexible part 22 separates the molded product of the clamping mechanism by moving the hard part 21 while moving in the same direction as the moving direction of the hard part 21 by the driving means. Device. The method of claim 1, The drive means, the flexible portion 22 is wound around the outer periphery, the bobbin 31 for rotating in the direction parallel to the direction of movement of the hard portion 21 and the motor for rotating the bobbin 31 to rotate Including; The flexible part (22) is released from the bobbin (31) in accordance with the rotation of the bobbin (31) characterized in that the moving part in the direction of the hard part (21). The method of claim 2, One end extends in the same direction as the moving direction of the hard part 21, and the other end extends in a direction tangential to the rotation direction of the bobbin 31, so that the flexible part 22 is released from the bobbin 31. And a guide (40) for guiding the flexible part (22) to move toward the hard part (21). The method according to any one of claims 1 to 3, The flexible part 22 is a molded product separation device of the clamping mechanism, characterized in that the multi-joint structure.

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