KR100473561B1 - A Clamping Device In An Injection Molding Machine - Google Patents

Abstract

The present invention relates to a mold clamping device of an injection molding machine, wherein a movable tie is inserted into a fixed tie of an injection molding machine, and a locker groove is formed on an inner circumference of an inner circumference of the fixed tie so that the mold may be fastened and fixed according to the progress of the injection operation during movement. The inner flange is formed, and the rocker corresponding to the rocker groove is formed in the sawtooth shape on the movable tie bar.

Description

Clamping Device In An Injection Molding Machine

The present invention relates to a molding apparatus of an injection molding machine that can more firmly mold the molding apparatus of the injection molding machine and minimize the volume of the gas, thereby reducing the driving energy source. The present invention relates to a clamping apparatus of an injection molding machine, which performs a boosting action for pushing the mold in the opposite direction and a mold clamping to fix the mold so as to prevent the mold from pushing.

In general, the clamping device of an injection molding machine can be divided into a toggle type and a direct pressure type according to a fastening method.

Here, the toggle method is to generate the clamping force by the elastic recovery force by the amount of elongation of the tie bar by using the kinematic principle of the toggle, and the direct pressure type to generate the clamping force by the hydraulic pressure different from the direct pressure of the clamping cylinder. The principle is to fasten the mold.

Apart from this, the conventional fastener of the injection molding machine has a problem in that when the large injection molding machine is manufactured with a large clamping force, the structure and volume of the entire machine are increased, thereby increasing the cost and space occupancy rate.

In addition, there is a limit in reducing the volume of the mold clamping unit in reducing the volume of the gas, there is a problem in that there is a limit in reducing the dimensions of the tie bar.

In addition, there is a problem of the mold clamping device occupying a lot of space due to the external protrusion of the tie bar during injection molding.

Accordingly, the present invention has been made in view of the above-described conventional problems, and a first object of the present invention is to provide a booster and a space for the protrusion of the tie bar which is a clamping device to be mounted to the outside in an injection molding machine. The booster is installed inside the injection molding machine so as to minimize the occupancy rate, and the tie bar provides a clamping device of the injection molding machine having a two-stage structure.

The second purpose of the present invention is to allow the movable tie connected to the movable plate to be inserted into the fixed tie bar of the stationary plate and to press the secondary plate on the auxiliary plate located on the same horizontal line on the other side of the movable plate. It is to provide a clamping device of the injection molding machine is installed between the booster and the auxiliary mold.

The object of the present invention, the transfer mold 22 on the base 10 to the transfer cylinder 72 after the transfer to the transfer cylinder 72 on the side of the stationary plate 30 opposite to the moving mold (22) In the mold clamping device for having a mold clamping force of the fixed mold 33, a plurality of fixed tie bars positioned between the movable mold plate 20 and the fixed mold plate 30 fixed to the fixed plate 30 side ( 31) and an inner flange 32 rotatably mounted to the front end side of the fixed tie 31 and having a plurality of rocker grooves 32a at regular intervals at an inner circumference at a predetermined pitch in the longitudinal direction on an inner circumferential surface thereof; ; Locker groove (32a) having a plurality of rockers (21a) on the outer circumferential surface at a predetermined pitch in a predetermined section of the other end is arranged in the same axis and the same axis as the fixed tie 31 and the other end Moving tire 21 to move forward and backward in accordance with the operating direction of the transfer cylinder 72 in the interior and A driving means for rotating the inner flange 32 is included, and the rocker groove 32a on the inner flange 32 side rotates in accordance with the rotational direction of the driving means so that the locker 21a is positioned at the same position or shifted from the rocker 21a. The locker 21a is characterized by having a sawtooth-shaped cross section. The rocker groove 32a is a locker when the inner flange 32 is rotated 45 °. The mold clamping is performed at a position shifted from (21a).

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Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

First of all, prior to the description of the embodiment, the molding apparatus of the molding injection molding machine will be briefly described as follows: 'The injection molding machine can be largely divided into an injection apparatus and a sibling apparatus, and the sibling apparatus fixes and moves the mold, and when the thermoplastic resin and the thermosetting resin are injected, Refers to a device for boosting the mold in the opposite direction to prevent the die from pushing and mold-fastening to fix the mold. In general, the direct clamping device does not require clamping, but the direct clamping device consumes a lot of oil and takes up a lot of space due to its large size. Therefore, the direct mechanical locking method and the locking head using half-nuts are used. The mechanical lock method using) has been adopted in recent years. '

Hereinafter, the configuration of the mold clamping apparatus of the injection molding machine according to the present invention will be described with reference to the accompanying drawings.

1 is a front view of an injection molding machine equipped with a clamping apparatus according to the present invention, Figure 2 is a side view of the injection molding machine.

As shown in Figure 1 and 2, the injection molding machine 100 is a base 10, the rail 11 is installed on one side of the upper side, the fixed mold 30 is installed and fixed to the other side of the base 10, The movable die 20 corresponding to the fixed die 30 and one side is installed downward on both sides of the movable die 20 and the other side is installed downward on both sides of the fixed die 30 and the movable die 20 The transfer means 70 for transferring the) and one side is connected to the movable plate 20, the other side is a movable tie 21 which is fastened to the fixed tie 31 of the fixed plate 30 and The pressure booster 50 is configured to press the auxiliary mold 40 to be guided along the movable tie 21 to the movable mold 22 in close contact with the fixed mold 33.

Here, the rail 11 is installed on one side of the base 10 so that the movable die 20 can be transferred, and the fixed die 30 is disposed on the other side of the base 10 so as to correspond to the movable die 20. It is fixed.

In addition, the transfer means 70 is provided downward on both sides of the stationary plate 30 to have a transfer cylinder 72, and a piston rod 71 that can slide back and forth within the transfer cylinder 72 is built therein. And, one side of the piston rod 71 is configured to be fastened with the movable plate 20.

The injection molding machine 100 is composed of three templates, and each fixed pair of the movable tie bar 21 connected to the other surface of the movable mold 20 is fixed to one surface of the fixed mold 30. It has a two-stage structure so that it can be inserted into the tie bar 31.

Here, the movable plate 20 slides toward the stationary plate 30 by the transfer cylinder 72 so that the movable plate 20 can be stopped at the correct position when the movable tie bar 21 is clamped. ), A series of rockers 21a are formed long along the axial direction (shown in FIGS. 3, 4 and 5).

The rocker 21a formed as described above is intended to mold-type correspond to the inner flange 32 mounted on the inner side of the fixing tie 31.

As described above, the tie bars 21 and 31 are fixed to the movable tie bar 21 so as to minimize the space ratio of the clamping device by changing the structure of the existing unified tie bar into a two-stage structure. It is composed of a structure that is inserted into the tie bar (31).

In addition, the auxiliary plate 40 is located on the same horizontal line on the other side of the movable plate 20 and is fitted to the movable plate 20 on the movable tie bar 21, and further, the auxiliary plate 40 A booster 50 is installed between the movable die 20 and the auxiliary die 40 so as to pressurize the vehicle.

Here, after the locking of the tie bars (21, 31), the booster (50) is a fixed mold (33) installed on one side of the fixed mold 30, the movable mold 22 installed on the other side of the auxiliary mold (40) In close contact with the movable mold 22 is made to press the secondary.

Looking at the operation of the present invention configured as described above, when the injection cylinder (72) shrinkage operation during the injection molding the movable plate 20 and the auxiliary plate 40 to the fixed plate 30 to the movable tie bar 21 Sliding transfer is made while being guided to), and when the molds 22 and 33 interconnected to the auxiliary mold 40 and the fixed mold 30 are touched, the operation of the cylinder 72 and the piston rod 71 is performed. It is stopped, the operation for locking on the fixed tie 31 of the fixed plate 30 is made, the booster 50 installed on one side of the movable plate 20 is pressed by the auxiliary plate 40 and the Secondary pressure is applied to the moving mold (22).

3 is a partial cross-sectional view of the mold clamping device according to part A of FIG. 1.

As shown in Figure 3, the mold clamping device is installed on the movable tie bar 21 and the fixing tie bar 31 is inserted into the inside of the fixed tie 31, the fixed tie bar 31 It consists of a hydraulic motor 60 for rotating the inner flange (32).

Here, each tie bar (21, 31) has a two-stage structure, the movable tie bar 21 is configured to slide and mold fastening to the inner flange 32 of the fixed tie bar (31).

Accordingly, the fixing tie 31 has a hollow shaft shape so that the moving tie bar 21 can be inserted, wherein the moving tie bar 21 has an inner flange (3) of the fixing tie bar 31. 32, two pairs of rockers 21a protrude along the axial direction at intervals of about 45 ° to each of four locations on the outer periphery so as to be inserted into the mold 32, and the rockers 21a continuously protrude repeatedly. Take the shape of a tooth.

In addition, the inner flange 32 of the fixed tie 31 is mounted on the inner side of the fixed tie 31, so that the rocker 21a of the movable tie 21 is guided to move along the axial direction. Since the rocker groove 32a is formed, and the rocker 21a has a tooth shape, when the rocker groove 32a is rotated about 45 ° by the rotational force of the hydraulic motor 60 installed on the top of the fixed tie 31, the axial direction The movement to is stopped and the lock is locked.

Figure 4 is a cross-sectional view showing the clamping state of each tie bar according to the present invention.

As shown in FIG. 4, the inner flange 32 is rotated by the rotational force of the hydraulic motor 60 so as to prevent the moving mold 22 from being pushed back when the moving tire 21 is transferred. Thus, the rocker 21a of the mobile tie 21 and the rocker groove 32a of the inner flange 32 are fixed to each other, thereby being clamped.

This is due to the rocker 21a having a series of teeth, and when the rocker 21a is mounted to the rocker groove 32a to correspond in shape, the rocker groove 32a is guided by the rocker groove 32a. The movable tie 21 can be moved into the fixed tie 31, and when the flange 32 is rotated so that the rocker groove 32a is staggered with respect to the toothed rocker 21a, the mold clamping state is locked. Can be.

5 is a cross-sectional view showing a mold release state of each tie bar according to the present invention.

As shown in FIG. 5, when the inner flange 32 installed on the inner circumference of the fixed tie 31 is rotated by 45 ° by the rotational force of the hydraulic motor 60 in the clamped state, the movable tie bar is rotated. The rocker groove 32a is mounted so as to correspond in shape to the rocker 21a so that the 21 can be reciprocated in the axial direction.

Therefore, the movable tie 21 may be inserted into the fixed tie 31 and reciprocated.

At this time, in order for the movable tie 21 to slide reciprocally with respect to the fixed tie bar 31 together with the transfer means 70, the movable tie bar 21 may correspond in shape to the rocker 21a of the movable tie bar 21. It is preferable that the size of the rocker groove 32a of the fixing tie 31 is relatively larger.

In the mold clamping apparatus 100 of the injection molding machine according to the present invention as described above, in addition to the hydraulic motor 60, an electric motor can be selected and used.

In addition, the rocker 21a of the movable tie 21 is formed at four places along the outer circumference, and is provided at one place, two places, three places, five places, six places, seven places, and eight places. Accordingly, the rocker grooves 32a of the corresponding inner flange 32 are also formed in four places, and in one place, two places, three places, five places, six places, seven places, and eight places. It can be installed and used.

As described above, according to the clamping apparatus of the injection molding machine according to the present invention, since the movable tie of the movable mold and the fixed tie of the fixed mold are two-stage insertion structures capable of clamping, the tie bar protruding from the clamping apparatus of the existing injection molding machine is used. The space inefficiency is improved, and the pressure booster is installed on the movable plate side to minimize the space of the mold clamping device as a whole.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various other modifications and variations may be made without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

1 is a front view of an injection molding machine equipped with a clamping apparatus according to the present invention;

2 is a side view of the injection molding machine,

3 is a partial cross-sectional view of the clamping device according to part A of FIG.

Figure 4 is a cross-sectional view showing the clamping state of each tie bar according to the present invention,

5 is a cross-sectional view showing a mold release state of each tie bar according to the present invention.

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

   10: base 11: rail

   20: moving plate 21: moving tie bar

   21a: rocker 22: moving mold

   30: fixed plate 31: fixed tie bar

   32: internal flange 32a: rocker groove

   33: fixed mold 40: auxiliary plate

   50: booster 60: hydraulic motor

   70: transfer means 71: piston rod

   72: transfer cylinder 100: injection molding machine

Claims (5)

The movable mold 22 and the fixed mold 33 are transferred to the transfer cylinder 72 from the stationary plate 30 side facing the movable die 20 on the base 10 before being stepped up by the booster 50. In the mold clamping device for having a clamping force, A plurality of fixed tie bars 31 positioned between the movable plate 20 and the fixed plate 30 and fixed to the fixed plate 30 side; An inner flange 32 rotatably mounted on the front end side of the fixing tie 31 and having a plurality of rocker grooves 32a at regular intervals at an inner circumference at a predetermined pitch in the longitudinal direction on an inner circumferential surface thereof; The locker groove (32a) having a plurality of rockers (21a) on the outer circumferential surface of the fixed tie 31 is arranged on the same axis line and one end is fixed to the movable die 20 side and a predetermined pitch in a predetermined section of the other end A moving tie bar 21 moving forward and backward in accordance with an operation direction of the transfer cylinder 72 in the interior thereof; Drive means for rotating the inner flange 32 is included, According to the rotational direction of the drive means, the inner flange 32 side rocker groove 32a is rotated and interlocked so as to be placed at the same or displaced position on the rocker 21a so that mold clamping is performed at the displaced position. Clamping device. delete delete The method of claim 1, The rocker (21a) is a clamping device of the injection molding machine, characterized in that it has a sawtooth-shaped cross section. The method of claim 1, The rocker groove (32a) is the clamping device of the injection molding machine, characterized in that the mold clamping is made in a position that is shifted from the rocker (21a) when the inner flange 32 is rotated 45 °.