KR101622136B1 - Vertical injection molding machine - Google Patents

Abstract

A vertical injection molding machine,
A main frame having a tie bar fixing frame at an upper portion thereof; A stationary platen fixedly installed on a lower portion of the main frame; A plurality of tie bars provided between the stationary platen and the tie bar fixing frame; A turntable rotatably installed at the center of the upper portion of the fixed platen; And a movable platen mounted on the upper portion of the stationary platen through a tie bar so as to be able to be locked on the stationary platen, Movable platen fixing clamp; An upper mold mounting plate installed at a lower portion of the movable platen; A lifting cylinder installed on both sides of the upper portion of the fixed platen and lifting the movable platen; And a pressurizing cylinder installed on both sides of the inner bottom center of the movable platen to press the upper mold mounting plate and the upper mold mounted thereon
In the process of injecting molten plastic resin through the injection unit into the upper mold and the lower mold, the upper mold is pressurized through the pressurizing cylinder to prevent the upper mold and the molten plastic resin from leaking, thereby molding high quality injection products It will be possible to do.

Description

{Vertical Injection Molding Machine}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vertical injection molding machine, and more particularly, to a vertical injection molding machine in which a movable platen to which an upper mold is mounted on an upper portion of a fixed platen to which a lower mold is mounted is lifted freely.

Vertical Injection Molding Machine is generally divided into vertical type vertical injection type and vertical type horizontal injection type according to characteristics such as work and molding method.

Also, according to the structure of the base plate on which the lower mold is mounted, it is divided into a rotary table type and a fixed table type.

Such a vertical injection molding machine has advantages and disadvantages in each method and is applied selectively according to a molding product.

In particular, the present invention relates to an injection molding machine in which a movable platen to which an upper mold is mounted on an upper portion of a fixed platen on which a lower mold is installed is installed so as to be able to ascend and descend, an injection unit installed centrally in the upper portion of the movable platen, Vertical injection molding type vertical injection molding machine in which molten plastic is supplied to an upper mold through a vertical injection molding machine.

FIG. 1A is a front view of a state in which a movable platen is elevated in a conventional vertical injection molding machine, and FIG. 1B is a front view of a state in which a movable platen is lowered in the conventional vertical injection molding machine.

1A and 1B, a vertical injection molding machine 500 according to the related art includes a fixed frame 511 provided on an upper portion of a main frame 510 and a fixed frame 511 provided on a lower portion of the main frame 510 The movable platen 550 can be elevated and lowered through a plurality of tie bars 520.

In the conventional vertical injection molding machine 500, a lower mold 210 is fixed to an upper portion of a stationary platen 520, an upper mold 220 is fixed to a lower portion of the movable platen 550 The upper mold 220 and the lower mold 210 are brought into close contact with each other when the movable platen 550 is lowered through the extension operation of the lifting cylinder 580 installed on both sides of the upper portion of the fixed frame 511 as shown in FIG. And the molten plastic resin is injected into the upper mold 220 through the injection unit 501 in the closed state of the mold to mold the injection product.

When the upper mold 220 and the lower mold 210 in a closed state are not firmly adhered to each other in the vertical injection molding machine 500 according to the related art, they are injected into the upper mold 220 through the injection unit 501 The upper mold 220 is lifted through the injection pressure of the molten plastic resin and the molten plastic resin leaks between the upper mold 220 and the lower mold 210,

In the vertical injection molding machine 500 according to the related art, when the movable platen 550 and the upper mold 220 are pressed in the process of injecting the molten plastic resin into the upper and lower sides of the fixed frame 511, A cylinder 590 is provided.

However, in the vertical injection molding machine 500 according to the related art, the lifting cylinder 580 and the pressure increasing cylinder 590 are installed on the upper part of the fixed frame 511 to increase the center of gravity, There was a problem of receiving the load.

In addition, the vertical injection molding machine 500 according to the related art has a problem in that the durability of the pressure-build cylinder 590 is lowered due to a long stroke of the pressure-build cylinder 590 and leakage of oil due to surface abrasion.

FIG. 2 is a front view illustrating a part of the vertical injection molding machine according to the prior art and showing damage.

In the vertical injection molding machine 500 according to the related art, the pressurizing cylinder 590 directly presses the upper mold 220 mounted on the lower center of the movable platen 550 while the upper mold 220 is lowered, The movable platen 550, the fixed platen 530, and the tie bar 520 are bent or otherwise deformed or damaged as shown in FIG. 2 because the upper and lower portions of the movable platen 550 are pressed. There was a problem.

The following Patent Document 1 discloses a mold pressing apparatus for an injection molding machine.

The mold pressurizing device of the injection molding machine of Patent Document 1 has a cylinder hole formed at the center of a fixed plate, a latching jaw and a shaped ram are provided in the cylinder, a movable plate is connected to a cylinder so as to move left and right, A shutter is provided between the support plate and the fixed plate provided on the rear surface of the movable plate so as to be operated by a cylinder so that the pressure of the secondary mold of the mold ram can be transmitted to the movable mold through the support.

The following Patent Document 2 discloses a mold clamping apparatus for an injection molding machine having a variable mold clamping force.

In the mold-clamping apparatus of an injection molding machine having a variable mold force of Patent Document 2, a tie bar is provided with a first type piston having a single diameter corresponding to a tie bar of a part of four tie bars, A first type hydraulic cylinder mechanism in which first and second pressure chambers are formed on the front and rear ends of the piston; The tie bar is provided with a second type piston made up of a small diameter portion and a large diameter portion in correspondence with the tie bar of the remaining one of the four tie bars. A second type hydraulic cylinder mechanism in which a first pressure chamber and a second pressure chamber are formed and a third pressure chamber 216 is formed at the rear end of the large diameter portion, And the mold clamping force is changed by supplying the hydraulic pressure to one of them.

Korean Patent Publication No. 10-1993-0019377 (published October 18, 1993) Korean Patent Publication No. 10-2015-0091642 (published on August 12, 2015)

However, the injection molding machine disclosed in Patent Document 1 is a horizontal type in which the movable plate moves in the left and right direction, and the movement of the support is limited by the shutter, and the pressing force can not be sufficiently supplied to the movable side mold.

The injection molding machine disclosed in Patent Document 2 is of a horizontal type in which the movable platen is moved in the horizontal direction as in the case of Patent Document 1 and provides a variable mold force at the tie bar portion so that the movable platen or tie bar may be deformed or damaged .

The object of the present invention is to provide a method of injecting molten plastic resin through an injection unit so that an upper mold can be more firmly adhered to a lower mold, And to provide a vertical injection molding machine capable of molding a product.

Another object of the present invention is to provide a vertical injection molding machine in which the center of gravity of the machine is lowered so that the movable platen and the upper mold can be smoothly lifted and moved without flowing.

Another object of the present invention is to provide a vertical injection molding machine capable of reducing the load on a movable platen, a fixed platen and a tie bar in a process of pressing an upper mold, thereby improving the durability of the component parts .

According to an aspect of the present invention, there is provided a vertical injection molding machine including a main frame having a tie bar fixing frame at an upper portion thereof; A stationary platen fixedly installed on a lower portion of the main frame; A plurality of tie bars provided between the stationary platen and the tie bar fixing frame; A turntable rotatably installed at the center of the upper portion of the fixed platen; And a movable platen mounted on the upper portion of the stationary platen through a tie bar so as to be able to be locked on the stationary platen, Movable platen fixing clamp; An upper mold mounting plate installed at a lower portion of the movable platen; A lifting cylinder installed on both sides of the upper portion of the fixed platen and lifting the movable platen; And a pressurizing cylinder installed on both sides of an inner bottom center of the movable platen to press the upper mold mounting plate and the upper mold mounted thereon.

The vertical injection molding machine according to the present invention is characterized in that a clamping irregular portion in which a movable platen fixing clamp is detachably connected is provided on an outer circumferential surface of a tie bar.

The vertical injection molding machine according to the present invention includes a case in which a movable platen fixing clamp is fixed to an upper surface of a movable platen; A clamping member having a semicircular fixing groove portion and movably installed on one side and the other side of the tie bar in a tie bar direction and in an opposite direction; And a clamping cylinder for fixing the cylinder body to the one clamping member and for connecting the actuating rod to the other clamping member so that the clamping member can open or close between the clamping members.

The vertical injection molding machine according to the present invention is characterized in that a plurality of support guides are provided between the upper mold mounting plate and the movable platen.

The vertical injection molding machine according to the present invention comprises a cylinder body in which a lower end portion of a lifting cylinder is fixed to a fixed platen; And an operating rod to which the upper end is connected to the movable platen.

A vertical injection molding machine according to the present invention comprises: a cylinder main body in which a pressurizing cylinder is integrally provided inside a movable platen; A piston which is installed in the cylinder body so as to be able to retract and retract; And an elastic member provided between the cylinder body and the piston and elastically supporting the piston.

The vertical injection molding machine according to the present invention is characterized in that the lower end of the piston of the pressurizing cylinder protrudes to the lower portion of the movable platen and the upper mold mounting plate is fixed to the lower end of the piston.

According to the vertical injection molding machine of the present invention, in the process of injecting the molten plastic resin into the upper mold and the lower mold in the closed state through the injection unit, the upper mold is pressed through the pressing cylinder, It is possible to mold a high quality injection product without defects by preventing leakage of the resin.

Further, according to the vertical injection molding machine of the present invention, it is possible to remove the pressure cylinder, the pre-fill valve, the hydraulic hose, and the auxiliary tank used in the conventional vertical injection molding machine, The manufacturing can be simplified, and the manufacturing cost can be greatly reduced.

Further, according to the vertical injection molding machine of the present invention, since the center of gravity of the machine can be minimized, it is possible to prevent the flow during the lifting and lowering of the movable platen, and the durability of the main parts such as the movable platen and the tie bar Can be greatly improved.

Further, according to the vertical injection molding machine of the present invention, since the upper mold is pressed by the pressurizing cylinder while the movable platen is fixed, the loads of the movable platen, the fixed platen and the tie bar can be reduced, It is possible to prevent the component from being deformed or damaged.

FIG. 1A is a front view of a movable platen in an elevated state in a conventional vertical injection molding machine,
FIG. 1B is a front view of the vertical type injection molding machine according to the prior art in a state where the movable platen is in the lowered state,
FIG. 2 is a front view illustrating a part of the vertical injection molding machine according to the prior art,
FIG. 3 is a longitudinal sectional view of a principal part of a vertical injection molding machine according to a preferred embodiment of the present invention,
4 is a longitudinal sectional view of the movable platen portion of the vertical injection molding machine according to the presently preferred embodiment,
5 is a plan view of a movable platen part of a vertical injection molding machine according to the presently preferred embodiment,
6 is a bottom view of the movable platen portion of the vertical injection molding machine according to the presently preferred embodiment,
Fig. 7A is a front view of the vertical injection molding machine in a state in which the movable platen is raised in the preferred embodiment; Fig.
7B is a front view of the movable platen lowering state of the vertical injection molding machine according to the present preferred embodiment,
8 is a side view of the movable platen lowering state of the vertical injection molding machine according to the presently preferred embodiment.

Hereinafter, a vertical injection molding machine according to the present invention will be described in detail with reference to the accompanying drawings.

In the following, the terms "upward", "downward", "forward" and "rearward" and other directional terms are defined with reference to the states shown in the drawings.

FIG. 3 is a vertical cross-sectional view of a vertical injection molding machine according to a preferred embodiment of the present invention, FIG. 4 is a longitudinal sectional view of a movable platen part of the vertical injection molding machine according to the present preferred embodiment, and FIG. FIG. 6 is a bottom view of a movable platen part of a vertical injection molding machine according to the present preferred embodiment. FIG. 6 is a plan view of a movable platen part of a vertical injection molding machine according to an example.

A vertical injection molding machine 100 according to a preferred embodiment of the present invention includes a main frame 110, a tie bar 120, a fixed platen 130, a turntable 140, a movable platen 150, A fixing clamp 160, an upper mold mounting plate 170, an elevating cylinder 180, and a pressurizing cylinder 190. And an injection unit 101.

The main frame 110 supports the respective components. The main frame 110 has a fixed platen 130 fixedly mounted on a lower portion thereof, and a tie bar fixing frame 111 provided on an upper portion thereof.

The tie bars 120 support the lifting and lowering of the movable platen 150, and a plurality of the tie bars 120 are fixed between the fixed platen 130 and the tie bar fixing frame 111.

The tie bars 120 are provided with clamping irregularities 121 on which movable plate fixing clamps 160 are detachably connected.

The fixed platen 130 supports the rotation of the turntable 140 and is fixed to the lower portion of the main frame 10.

The turntable 140 is mounted on the lower mold 210 and is rotatably installed at the upper center of the stationary platen 130.

The movable platen 150 is mounted on an upper portion of the stationary platen 130 through a tie bar 120 by mounting the upper mold 220.

At the center of the movable platen 150, an injection unit passage hole 152 is provided.

The movable platen fixing clamp 160 is configured to lock the movable platen 150 which is lowered toward the fixed platen 130. The movable platen fixing clamp 160 is installed at the passing portion of the tie bar 120 at the upper end of the movable platen 150 do.

The movable platen fixing clamp 160 includes a case 161 fixed to the upper surface of the movable platen 150; A clamping member 162 having a semi-circular fixing groove portion and movably installed on one side and the other side of the tie bar 120 in the direction of the tie bar 120 and the opposite direction; And a clamping cylinder 163 for fixing the cylinder body to the one clamping member 162 and for connecting the actuating rod to the other clamping member 162 to open and close between the clamping members 162 .

The upper mold mounting plate 170 is for mounting the upper mold 220 and is installed at the lower portion of the movable platen 150.

A plurality of support guides 171 are provided between the upper mold mounting plate 170 and the movable platen 150.

At the center of the upper mold mounting plate 170, an injection unit passage hole 172 is provided.

The lifting cylinder 180 is for lifting and moving the movable platen 150, and is installed on both sides of the fixed platen 130.

The lifting cylinder 180 has a cylinder body 181 whose lower end is fixed to the fixed platen 130; And an operating rod 182 whose upper end is connected to the movable platen 150.

The pressurizing cylinder 190 presses the upper mold mounting plate 170 and the upper mold 220 mounted thereon to tightly adhere the upper mold 220 to the lower mold 210. When the movable platen 150 is rotated, As shown in FIG.

The pressurizing cylinder 190 includes a cylinder body 191 integrally provided within the movable platen 150; A piston 192 which is installed in the cylinder main body 191 so as to be able to move in and out of the cylinder body 191; And an elastic member 193 provided between the cylinder main body 191 and the piston 192 to elastically support the piston 192.

The lower end of the piston 192 of the pressure cylinder 190 protrudes to the lower portion of the movable platen 150 and the upper mold mounting plate 170 is fixed to the lower end of the piston 192.

The injection unit 101 injects molten plastic resin into the upper mold 220 and is installed at the upper center of the movable platen 150 and moves up and down together with the movable platen 150.

The structure of the injection unit 101 will be apparent to those skilled in the art, and a detailed description thereof will be omitted.

Fig. 7A is a front view of the vertical injection molding machine in a state in which the movable platen is elevated, Fig. 7B is a front view of the movable platen lowering state of the vertical injection molding machine according to the presently preferred embodiment, and Fig. Fig. 6 is a side view of the movable platen lowering state of the vertical injection molding machine according to the embodiment. Fig.

In the vertical injection molding machine 100 according to the preferred embodiment of the present invention, the movable platen 150 and the injection unit 101 are raised and lowered through the lifting cylinder 180 installed on both sides of the upper end of the fixed platen 130 The upper mold 220 and the lower mold 210 come into close contact with each other when the movable platen 150 is lowered through the contracting operation of the lifting cylinder 180. When the movable platen 150 is lowered by the contracting operation of the lifting cylinder 180, The molten plastic resin is injected into the upper mold 220 to form an injection product.

In the vertical injection molding machine 100 according to the preferred embodiment of the present invention, the upper mold 220 is brought into close contact with the lower mold 210 by the lowering of the upper mold 220, The upper mold 220 can be pressed to form a high quality injection product. Hereinafter, the pressing operation of the pressurizing cylinder 190 will be described as follows.

That is, when the lifting cylinder 180 is extended as shown in FIG. 7A, the movable platen 150 and the upper mold 220 are in an elevated state.

The movable platen 150 and the upper mold 220 are lowered when the lifting cylinder 180 is contracted in the lifting state of the upper mold 220 and the upper mold 220 is brought into close contact with the lower mold 210, And the mold is closed.

In the vertical injection molding machine 100 according to the preferred embodiment of the present invention, the upper mold 220 includes an upper mold mounting plate (not shown) fixed to the piston 192 of a pressurizing cylinder 190 integrally provided on the movable platen 150 The elastic force of the elastic member 193 for elastically supporting the piston 192 acts on the upper mold mounting plate 170 and the upper mold 220. As a result,

The upper mold 220 and the upper mold mounting plate 170 and the piston 192 of the pressing cylinder 190 are pressed against the elastic member 193 And the upper mold 220 on which the elastic force of the elastic member 193 acts acts more firmly on the lower mold 210. [

The movable platen 150 is fixed to the tie bar 120 through the movable platen clamp 160 when the mold is closed.

That is, when the control unit (not shown) shrinks the clamping cylinder 163 of each of the movable flat clamps 160 in the extended state in a state that the mold is closed, a pair of clamping members 162 are moved to the tie bar 120, While the movable platen 150 is locked to the tie bar 120. The movable platen 150 is coupled to the tie bar 120 of the tie bar 120,

When the control unit 190 causes the pressurizing cylinder 190 to be extended while the movable platen 150 is fixed via the movable platen clamp 160, the elastic member 193 is moved in the downward direction of the movable platen 150, The downward pressing force acts on the piston 192 of the pressurizing cylinder 190 and the upper mold mounting plate 170 and the upper mold 220 so that the upper mold 220 is moved downward by the lower mold 210 ).

In the vertical injection molding machine 100 according to the preferred embodiment of the present invention, the downward pressing force on the upper mold 220 is not applied to the movable platen 150, The upper mold 220 can be stably and firmly attached to the lower mold 210 because the piston 192 of the pressing cylinder 190 provided at the lower center of the movable platen 150 is fixed .

In addition, when the upper mold 220 is pressed through the pressurizing cylinder 190, the movable platen 150, the fixed platen 130, and the tie bar 120 are not subjected to a load, do.

The vertical injection molding machine 100 according to the preferred embodiment of the present invention is configured to inject the molten plastic resin into the vertical mold 220 and the lower mold 210 through a pair of pressure cylinders 190, The upper mold 220 is pressurized by the pressure so that the molten plastic resin is injected into the upper mold 220 and the lower mold 210 through the injection unit 101 to completely block lifting of the upper mold 220 So that it is possible to mold a high-quality injection product without defects.

On the other hand, after the molded product is molded, the control unit expands the movable platen clamp 160 to release the locking of the movable platen 150, and stop the extension operation of the pressure cylinder 190.

Next, the control unit causes the movable platen 150, the upper mold mounting bracket 170, and the upper mold 220 to move upward by operating the lifting cylinder 180 to extend, and the mold is opened by the upward movement of the upper mold 220 The injection molded product can be taken out from the lower mold 210.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

100: Vertical injection molding machine
101: injection unit
110: main frame
111: Fixed frame
120: Taiba
130: Fixed Platen
140: Turntable
150: movable platen
160: movable platen clamp
170: upper mold mounting plate
180: lifting cylinder
190: Pressure cylinder
210: Lower mold
220: upper mold

Claims (7)

A main frame 110 on which a tie bar fixing frame 111 is provided;
A fixed platen 130 fixedly installed at a lower portion of the main frame 110;
A plurality of tie bars 120 installed between the stationary platen 130 and the tie bar fixing frame 111;
A turntable 140 rotatably installed at an upper center of the interior of the fixed platen 130;
A movable platen 150 which is vertically installed on the fixed platen 130 through a tie bar 120;
A movable platen fixing clamp 160 installed at an upper portion of the movable platen 150 at the passage of the tie bar 120 to lock the movable platen 150 descending toward the fixed platen 130;
An upper mold mounting plate 170 installed at a lower portion of the movable platen 150;
A lifting cylinder 180 for lifting the movable platen 150;
And a pressurizing cylinder 190 installed on both sides of an inner bottom center of the movable platen 150 to press the upper mold mounting plate 170 and the upper mold 220 mounted on the upper mold mounting plate 170. In the vertical injection molding machine,
The lifting cylinder 180 is installed between the fixed platen 130 and the movable platen 150 on both sides of the fixed platen 130,
The lower end of the cylinder body 181 of the lifting cylinder 180 is fixed to the lower end of the fixed platen 130 and the upper end of the actuating rod 182 of the lifting cylinder 180 is connected to the movable platen 150 And,
A plurality of support guides 171 for supporting the upper mold mounting plate 170 and the upper mold 220 are provided between the upper mold mounting plate 170 and the movable platen 150,
The lower end of the piston 192, which is installed in the cylinder body 191 integrally provided in the movable platen 150, is protruded to the lower portion of the movable platen 150,
An upper mold mounting plate 170 is fastened to the lower end surface of the piston 192 of the pressure cylinder 190,
A hollow portion is provided in the upper portion of the piston 192 of the pressure cylinder 190,
The piston 192 and the upper mold mounting plate 170 and the upper mold 220 are elastically supported between the lower end of the hollow portion of the piston 192 of the pressurizing cylinder 190 and the upper end of the cylinder body 191, And an elastic member (193) for firmly adhering the upper mold (220) to the lower mold (210) is installed in the process of the vertical injection molding machine. The method according to claim 1,
Characterized in that the tie bar (120) is provided with a clamping irregular portion (121) to which the movable platen fixing clamp (160) is detachably connected to the upper portion of the outer circumferential surface. The method according to claim 1,
The movable platen securing clamp 160
A case 161 fixed to the upper surface of the movable platen 150;
A clamping member 162 having a semi-circular fixing groove portion and movably installed on one side and the other side of the tie bar 120 in the direction of the tie bar 120 and the opposite direction;
And a clamping cylinder 163 fixed to the one clamping member 162 and connected to the other clamping member 162 so that the actuating rod can open or close between the clamping members 162 Wherein the vertical injection molding machine comprises a vertical injection molding machine. delete delete delete delete

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