KR20200113899A - Hot runner injection molding apparatus for injection with constant volume and pressure - Google Patents

Abstract

The present invention relates to a hot runner injection molding apparatus. Particularly, the molten resin in an injector is packed and stored in a molten resin storage cylinder (41) communicated with a cavity (14) of a mold in a constant amount under a predetermined pressure. Then, when the cavity (14) of the mold is closed, the molten resin stored in the internal space (42) of the molten resin storage cylinder (41) is ejected to the cavity (14) of the mold in a constant amount under a constant pressure, while a plunger (50) moves from the maximum rearward position to the maximum forward position in the internal space (42) of the molten resin storage cylinder (41), in communication with the closing operation.

Description

Hot runner injection molding apparatus for injection with constant volume and pressure}

The present invention relates to a hot runner injection mold apparatus, and more particularly, to a hot runner injection mold apparatus capable of injecting a constant amount of molten resin into a cavity of a mold at a constant pressure.

Recently, a hot runner injection mold device has been widely used as a plastic injection mold. As such a hot runner injection mold apparatus, those disclosed in the following patent documents are generally widely known. In the case of the conventional hot runner injection mold apparatus disclosed in Patent Document 1, the molten resin discharged at a constant pressure from the nozzle of the injection machine passes through the sprue of the mold, the runner of the manifold, and the resin passage of the valve body in order, just before the gate of the mold. At the moment of reaching and closing, the valve pin closing the gate is retracted, opening the gate and injecting the molten resin of the resin passage into the mold cavity through the opened gate.

In the case of the above-described conventional hot runner injection mold, when the molten resin is discharged from the injection machine, the molten resin is supplied to the cavity by the discharge pressure generated from the injection machine, so that the distance from the sprue, which is the injection port, to the gate is relatively long. In this case, a pressure loss occurs during the flow from the sprue to the gate, resulting in a problem of insufficient filling pressure in the cavity. In order to compensate for such a pressure loss, in the case of a conventional hot runner injection mold, the injection pressure in the injection machine must be increased, but when the injection pressure is increased, the clamping force must be increased, so that the mold size is increased.

In addition, in the case of multi-gates with different distances from the sprue to each gate, the filling pressure of the cavity is not constant depending on the flow distance of the molten resin from the sprue to the gate, and accordingly, the filling amount of the molten resin in the cavity is uneven. There was a problem that caused injection defects as it became worse.

And, in the case of a conventional hot runner injection mold, the mold is closed, and then the molten resin is injected from the injection machine to fill the cavity, so the so-called cycle time required for a series of processes from injection of the molten resin to filling the cavity in the injection machine is the injection machine. There is a disadvantage that the entire cycle time is lengthened, as the molten resin injected from is longer as long as the time it takes to reach just before the gate at the tip of the valve body (the time it takes just before injecting the molten resin into the cavity).

KR 10-2018-0101993A KR 10-0925280B1

Accordingly, the present invention solves the disadvantages of the conventional hot runner injection mold apparatus, so that a predetermined amount of molten resin can be filled into the cavity at a constant pressure without being affected by the distance of the resin passage from the injection machine to the gate. An object of the present invention is to provide a hot runner injection mold device for quantitative static pressure discharge.

On the other hand, the present invention is to provide a hot runner injection mold device for quantitative static pressure discharge that can shorten the entire cycle time by reducing the idle time taken for the molten resin extruded from the injection machine to reach the tip of the valve body of the mold. have.

The present invention for achieving the above object,

An upper fixing plate on which a sprue into which the molten resin extruded from the injection machine is introduced is installed; A manifold having a resin passage for distributing the molten resin extruded from the injection machine; An upper mold block provided with a gate and spaced apart from the upper fixed plate by a certain gap or moving to approach the upper fixed plate; A lower mold block forming a cavity together with the upper mold block, closing the cavity when it is combined with the upper mold block at a lower side of the upper mold block, and opening the cavity when separated from the upper mold block; And a valve body installed on the upper mold block to have an internal resin passage and communicate the resin passage between the gate and the manifold through the inner resin passage,

It has an internal space of a certain volume, and the internal space communicates with the resin passage of the manifold through the inlet port of the side wall, and communicates with the inner passage of the valve body through the outlet port, so that the resin when the cavity is opened. A molten resin storage cylinder for receiving and storing the molten resin of the injection machine provided through the passage by a predetermined volume; And

In the inner space of the molten resin storage cylinder, it is installed to reciprocate between a maximum retraction position forming the maximum volume of the molten resin storage cylinder and a maximum forward position forming the minimum volume of the molten resin storage cylinder, the When the lower mold block is in close contact with the upper mold block to close the cavity, the molten resin stored in the molten resin storage cylinder is discharged into the cavity through the gate in conjunction with the operation of the upper mold block, and conversely, the lower mold And a plunger for storing the molten resin by flowing into the inner space as much as the maximum volume when the block is separated from the upper mold block and the cavity is opened.

When the lower mold block is spaced apart from the upper mold block to open the cavity, the plunger is placed in the maximum retracted position, and when the lower mold block is in close contact with the upper mold block to close the cavity, the plunger is placed at the maximum advanced position. And a plunger actuator that operates the plunger in connection with the forward/reverse operation of the lower mold block and the upper mold block.

In addition, the present invention,

A manifold having a resin passage for distributing the molten resin extruded from the injection machine, an upper mold block having a gate, and forming a cavity together with the upper mold block and closing the cavity when intimately coupled to the upper mold block. A valve body having a lower mold block that opens the cavity when it is separated from the upper mold block, and a resin passage of the manifold is connected to one side thereof, and an inner passage coaxially communicates with the gate of the upper mold block, In the inner passage of the valve body, it is provided to move between the upper and lower limits along the central axis direction of the inner passage, and when located at the lower limit, the lower end closes the gate of the upper mold block and is located at the upper limit position, A hot runner injection mold apparatus having a valve pin at a lower end to open the gate, a valve pin actuator for operating the valve pin so that the valve pin moves between an upper limit and a lower limit, and an upper fixing plate on which the valve pin actuator is installed. In,

An injection machine provided with an internal space, an inlet port connecting the internal space and the resin passage of the manifold on the side wall, and an outlet port connecting the internal space to the gate on the other side, and provided through the resin passage A molten resin storage cylinder receiving and storing the molten resin of the determined volume; And

It is fixed to the upper fixed plate and is installed to be reciprocally moved between the maximum retracting position forming the maximum volume and the maximum forwarding position forming the minimum volume in the molten resin storage cylinder, and when reversing to the maximum retracting position, the The inlet port of the molten resin storage cylinder is opened to fill the molten resin in the resin passage by the maximum volume of the molten resin storage cylinder, and the inlet port is closed when the molten resin in the resin passage is moved from the maximum retracted position to the maximum advancing position. It is characterized by including a; a plunger that blocks the inflow into the inner space of the molten resin storage cylinder, and simultaneously discharges the molten resin stored in the molten resin storage cylinder by a predetermined volume.

The plunger actuator is coupled to the upper end of the plunger, and one end is rotatably coupled to the hinge pin on the upper plate of the mold to move the plunger up and down while turning around the hinge pin by a certain angle ;

A connecting rod having one end connected to one side of the lower mold block so as to linearly reciprocate in connection with the opening and closing operation of the cavity of the lower mold block;

One side is connected to the upper plate of the mold so as to be able to pivot around the center pin, and one end is connected to the operating lever and the other end is connected to the tip of the connection rod, and the center pin is connected to the linear reciprocating motion of the connection rod. It characterized in that it consists of; a link bar for moving the operation lever in the vertical direction of the plunger while turning about the center.

The valve pin actuator includes: a valve cylinder having an internal space and having a first flow passage and a second flow passage for introducing or outflowing a working fluid into the inner space, and installed on an upper fixed plate; The upper end of the valve pin is coupled to the bottom, and the inner space of the valve cylinder is divided into an upper piston chamber through which the first flow path is communicated and a lower piston chamber through which the second flow path is communicated, so that the working fluid is selectively applied to the upper piston chamber or the lower piston chamber. It is composed of a piston mechanism comprising a; piston closing or opening the gate with the valve pin while moving forward or backward in the inner space of the valve cylinder as it flows into.

The plunger actuating mechanism is fixed by coupling and fixing the upper end of the plunger to an upper fixing plate on which the valve cylinder is fixedly installed, and the valve pin is operated only by a piston mechanism without being affected by the operation of the plunger. It consists of a penetrating plunger holder.

As the upper mold block moves toward the upper fixed plate while the lower mold block is moved to close the cavity, the molten resin storage cylinder moves so that the plunger moves relative to the maximum forward position, and conversely, the lower mold block It is characterized in that the molten resin storage cylinder moves so that the plunger moves relative to the maximum retracted position as the upper mold block moves in a direction away from the upper fixing plate in a state where the cavity is opened by moving. .

According to the present invention described above, since it is possible to always fill the cavity with a predetermined amount of molten resin at a constant pressure without being affected by the distance of the resin passage from the injection machine to the gate, it is possible to mold injection products of uniform quality. .

According to the present invention, the overall cycle time can be shortened by reducing the idle time taken for the molten resin extruded from the injection machine to reach the tip of the valve body of the mold, thereby improving productivity.

1 is a view of an injection mold apparatus according to a first embodiment of the present invention, and is a view with a cavity open.
FIG. 2A is an operational state diagram of the injection mold apparatus according to the first embodiment of the present invention, and is a view showing an operational state of storing a certain amount of molten resin in the molten resin storage cylinder.
FIG. 2B is an operational state diagram of the injection mold apparatus according to the first embodiment of the present invention, and, following the operation state shown in FIG. 2A, an operational state in which a certain amount of molten resin is discharged into the cavity from the melt storage cylinder. It is a drawing showing.
3A is a view showing an operating state of an injection mold apparatus according to a second embodiment of the present invention, and is a view showing an operating state of storing a certain amount of molten resin in a molten resin storage cylinder.
3B is a view showing the operating state of the injection mold apparatus according to the second embodiment of the present invention. Following the operating state shown in FIG. 3A, a certain amount of molten resin is discharged from the molten resin storage cylinder into the cavity. It is a drawing showing the operating state.
4A is a view showing an operating state of the open gate type injection mold apparatus according to the third embodiment of the present invention, and is a view showing an operating state of storing a certain amount of molten resin in the molten resin storage cylinder.
4B is a view showing the operating state of the injection mold apparatus according to the third embodiment of the present invention. Subsequent to the operating state shown in FIG. 4A, a certain amount of molten resin is discharged from the molten resin storage cylinder into the cavity. It is a drawing showing the operating state.

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

<First Example>

The injection mold apparatus according to the first embodiment of the present invention is an upper fixing plate provided with a sprue 18 into which a molten resin extruded from an injection machine (not shown) is introduced, as shown in FIGS. 1, 2A and 2B. (61), a manifold (15) having a resin passage (16) for distributing the molten resin extruded from the injection machine, a gate (12) is provided, and is spaced apart by a certain gap from the upper fixed plate (61) or A cavity 14 is formed together with the upper mold block 11 moving to approach the fixed plate 61 and the upper mold block 11, and the upper mold block 11 is formed from the lower side of the upper mold block 11 ) And a lower mold block 13 that closes the cavity 14 when combined with, and opens the cavity 14 when separated from the upper mold block 11.

And, a valve body 21 is installed on the upper mold block 11. The valve body 21 has an inner passage 22 connected to the resin passage 16 of the manifold 15 and coaxially communicated with the gate 12 of the upper mold block 11. The valve pin 23 is installed to move between the upper and lower limits in the inner passage 22 of the valve body 21 along the central axis direction of the inner passage 22.

The valve pin 23 is moved between the upper and lower limits by the operation of the valve pin actuator. When the valve pin 23 is positioned at the lower limit, the lower end closes the gate 12 of the upper mold block 11, and when positioned at the upper limit position, the lower end opens the gate 12.

A valve pin actuator for operating the valve pin 23 so that the valve pin 23 moves between the upper and lower limits is provided on the upper fixing plate 61.

The valve pin actuator has an internal space, a valve cylinder installed on the upper fixing plate 61 with a first flow path 62b and a second flow path 62a for introducing or outflowing the working fluid into the internal space. 71) and; The upper piston chamber 72a in which the first passage 62b communicates with the upper piston chamber 72a in which the first passage 62b communicates with the upper end of the valve pin 23 is connected to the upper end of the valve pin 23 and the lower piston in which the second passage 62a communicates Divided into a chamber 72b, as the working fluid selectively flows into the upper piston chamber 72a or the lower piston chamber 72b, it moves forward or backward in the inner space of the valve cylinder 71 to the valve pin 23 at the gate ( It consists of a piston mechanism comprising a; piston (75) for closing or opening 12).

As shown in FIG. 1, the injection mold apparatus of the present invention includes a fixed-quantity and static-pressure discharge mechanism for receiving and storing a certain amount of molten resin and then discharging the molten resin into the cavity at a certain pressure by a certain amount. Such a fixed-quantity and static pressure discharge mechanism has a structure including a molten resin storage cylinder 41 and a plunger 50 for pushing the molten resin stored in the molten resin storage cylinder 41.

The molten resin storage cylinder 41 has an inner space 42, and an inlet port 43 connecting the inner space 42 and the resin passage 16 of the manifold 15 to the side wall, The other side is provided with an outlet port connecting the inner space 42 to the gate 12, and receives and stores the molten resin of the injection machine provided through the resin passage 16 by a predetermined volume.

The plunger 50 has an upper portion 51 fixed to the upper cover plate 17 through a plunger holder 81. The plunger 50 is installed so as to reciprocate between a maximum retraction position forming a maximum volume and a maximum advance position forming a minimum volume within the inner space 42 of the molten resin storage cylinder 41.

2A, when the plunger 50 moves backward to the maximum retracted position, the molten resin in the resin passage 16 is melted by opening the inlet port 43 of the molten resin storage cylinder 41. The inner space 42 of the resin storage cylinder 41 is filled by the maximum volume.

As shown in Fig.2b, when the plunger 50 moves from the maximum retracted position to the maximum advanced position as the upper cover plate 17 moves in close contact with the bottom of the upper fixing plate 61, molten resin is stored. The inlet port 43 of the cylinder 41 is closed to prevent the molten resin in the resin passage 16 of the manifold 15 from flowing into the inner space of the molten resin storage cylinder 41, and at the same time, the molten resin storage cylinder The molten resin stored in (41) is discharged into the cavity (14) by a certain volume.

As described above, in the injection mold apparatus of the present invention, the molten resin extruded from the injection machine is stored in the molten resin storage cylinder 41 of a certain volume and discharged to the cavity at a constant pressure as much as the stored volume. Is injected into the cavity with a constant pressure to mold a product of uniform quality.

<Second Example>

In the injection mold apparatus according to the second embodiment of the present invention, as shown in FIGS. 3A and 3B, a sprue 18 into which a molten resin extruded from an injection machine (not shown) is introduced is installed, and the sprue 18 A manifold (15) having a resin passage (16) for distributing the molten resin provided through), an upper mold block (11) provided with a gate (12), and a cavity ( 14), and when it is combined with the upper mold block 11 from a lower side of the upper mold block 11, the cavity 14 is closed, and when separated from the upper mold block 11, the cavity ( It includes a lower mold block 13 to open 14).

A valve body 21 is installed on the upper mold block 11. The valve body 21 has an inner passage 22 connected to the resin passage 16 of the manifold 15 and coaxially communicated with the gate 12 of the upper mold block 11. The valve pin 23 is installed to move between the upper and lower limits in the inner passage 22 of the valve body 21 along the central axis direction of the inner passage 22.

The valve pin 23 moves between the upper and lower limits. When the valve pin 23 is positioned at the lower limit, the lower end closes the gate 12 of the upper mold block 11, and when positioned at the upper limit position, the lower end opens the gate 12.

The valve pin 23 moves between an upper limit and a lower limit in conjunction with an operation of a plunger actuator to be described later, and a plunger actuator for operating the valve pin 23 is provided on the upper fixing plate 61.

The injection mold apparatus according to the second embodiment, as shown in Figs. 3A and 3B, includes a fixed-quantity and positive-pressure discharge mechanism for receiving and storing a certain amount of molten resin, and then discharging a certain amount into the cavity at a certain pressure. Such a fixed-quantity and static pressure discharge mechanism has a structure including a molten resin storage cylinder 41 and a plunger 50 for pushing the molten resin stored in the molten resin storage cylinder 41.

The molten resin storage cylinder 41 has an inner space 42, and an inlet port 43 connecting the inner space 42 and the resin passage 16 of the manifold 15 to the side wall, The other side is provided with an outlet port connecting the inner space 42 to the gate 12, and receives and stores the molten resin of the injection machine provided through the resin passage 16 by a predetermined volume.

The plunger 50 has an upper portion fixed to the upper fixing plate 61 through a plunger holder 96. The plunger 50 is installed so as to reciprocate between a maximum retraction position forming a maximum volume and a maximum advance position forming a minimum volume within the inner space 42 of the molten resin storage cylinder 41.

As shown in FIG. 3A, when the plunger 50 moves backward to the maximum retracted position in the molten resin storage cylinder 41, the inlet port 43 of the molten resin storage cylinder 41 is opened to open the resin passage. The molten resin of (16) is filled in the inner space 42 of the molten resin storage cylinder 41 by the maximum volume.

As shown in FIG. 3B, when the lower mold block 13 is in close contact with the bottom surface of the upper mold block 11 and the cavity 14 is closed, the plunger 50 is at the maximum retracted position by the plunger actuator. Move to the maximum forward position.

When the plunger 50 is moved from the maximum retracted position to the maximum advanced position by the plunger actuator, the plunger 50 closes the inlet port 43 of the molten resin storage cylinder 41 to close the resin passage of the manifold 15. The molten resin of 16 is blocked from flowing into the inner space of the molten resin storage cylinder 41, and at the same time, the molten resin stored in the molten resin storage cylinder 41 is discharged into the cavity 14 by a certain volume.

Here, the plunger actuator is connected to the upper end of the plunger 50 with the plunger holder 96, and is rotatably coupled to the upper fixing plate 61 of the mold around the hinge pin 95a, the hinge pin 95a ) An operation lever 95 for moving the plunger 50 up and down while turning around a certain angle;

A connecting rod 91 having one end connected to one side of the lower mold block 13 so as to linearly reciprocate in connection with the opening and closing operation of the cavity of the lower mold block 13; And

One side is connected to the upper fixing plate 61 of the mold so that it can pivotally move around the center pin 93, and one end is connected to the operating lever 95, and the other end is connected to the tip of the connecting rod 91. A link bar 94 connected to the provided head 92 to move the plunger 50 in the vertical direction while turning around the center pin 93 in connection with the linear reciprocating motion of the connecting rod 91; It characterized in that it was made.

As shown in FIGS. 3A and 3B, when the plunger 50 is raised and lowered by the plunger actuator, the valve pin 23 is moved to the gate closing position or A valve pin actuator is provided for raising and lowering to the gate open position.

The valve pin actuator is rotatably installed around a moving block 99 that is interlocked in the same direction as the direction of movement of the plunger 50 and has a latching portion on one side, and a pin fixed to the upper fixing plate 61 And a pinion 98 engaged with the rack gear portion of the movable block 99, and a movable block coupled to the upper end of the valve pin 23 and provided with a rack gear portion on one side to engage the pinion 98 ( 97).

Hereinafter, the operation of the hot runner injection mold apparatus according to the second embodiment will be described with reference to FIGS. 3A and 3B.

The lower mold block 13 is separated from the upper mold block 11 by the elastic force of the spring 2 to open the cavity 14. At this time, in accordance with the opening operation of the lower mold block 13, the plunger actuator moves the plunger 50 to the maximum retracted position in the molten resin storage cylinder 41. Thereby, the inner space of the molten resin storage cylinder 41 becomes the maximum volume.

Accordingly, the molten resin extruded from the injection machine is introduced into the molten resin storage cylinder 41 through the resin passage 16 of the sprue 18 and the manifold 15 and stored in the maximum volume.

In this state, as shown in FIG. 3B, when the lower mold block 13 is moved toward the upper mold block 11 and the cavity 14 is closed, the connection rod 91 according to the operation of the lower mold block 13 ) Rises in the direction of the black arrow to raise the head 92. As the head 92 of the connecting rod 91 rises, the link bar 94 is rotated clockwise around the center pin 93 in the drawing.

The plunger 50 is maximally advanced by pressing the plunger holder 96 provided on the upper end of the plunger 50 while the operating lever 95 rotates around the pin 95a according to the turning operation of the link bar 94. Move to the position. At the same time, the valve pin actuator is operated according to the operation of the operating lever 95, and the valve pin 23 is moved to the gate opening position to open the gate.

Accordingly, the plunger 50 moves from the maximum retracted position to the maximum advanced position, and the molten resin stored in the maximum volume in the molten resin storage cylinder 41 is transferred to the cavity 14 through the gate 12 opened by the valve pin actuator. It discharges at a fixed amount and positive pressure.

<Third Example>

4A and 4B illustrate a hot runner injection mold apparatus according to a third embodiment of the present invention.

A hot runner injection mold apparatus according to a third embodiment of the present invention includes an upper fixing plate 61 installed with a sprue 18 into which a molten resin extruded from an injection machine (not shown) is introduced, and a molten resin extruded from the injection machine. A manifold (15) having a resin passage (16) for distribution, a gate (12) is provided, and the upper fixing plate (61) is spaced apart by a predetermined gap by a spring (19) or the upper fixing plate (61) When forming a cavity 14 together with the upper mold block 11 and the upper mold block 11 moving to approach the upper mold block 11, and when it is combined with the upper mold block 11 from the lower side of the upper mold block 11 And a lower mold block 13 that closes the cavity 14 and opens the cavity 14 when separated from the upper mold block 11.

In addition, a valve body 21A is installed on the upper mold block 11. The valve body 21A has an inner passage 22 connected to the resin passage 16 of the manifold 15 and coaxially communicated with the gate 12 of the upper mold block 11. , It is an open gate type valve.

Hereinafter, the operation of the hot runner injection mold apparatus according to the third embodiment will be described with reference to FIGS. 4A and 4B.

The lower mold block 13 is in close contact with the upper mold block 11 to close the cavity 14. At this time, the upper mold block 11 is spaced downward from the upper fixing plate 61 by the elastic force of the spring 19. Accordingly, the plunger 50 coupled by the plunger holder 51 to the bottom of the upper fixing plate 61 is located in the maximum retracted position in the inner space 42 of the molten resin storage cylinder 41 to store the molten resin. The maximum volume is formed in the inner space 42 of the cylinder 41.

The molten resin of the injection machine passes through the sprue 18, the resin passage 16 of the manifold 15, and the inlet port 43 of the molten resin storage cylinder 41 in order, and the inner space of the molten resin storage cylinder 41 ( 42) and filled to the maximum volume.

In this state, when the upper mold block 11 and the lower mold block 13 are moved so that the upper mold block 11 is in close contact with the upper fixed plate 61 against the elastic force of the spring 19, the plunger 50 The molten resin stored in the maximum volume in the inner space 42 of the molten resin storage cylinder 41 is moved from the maximum reverse position of the inner space 42 of the molten resin storage cylinder 41 to the maximum forward position at a constant pressure. It is discharged into the cavity 14 through the inner passage 22A and the gate 12 of the valve body 21.

2: spring 3: spring seat
11: upper mold block 12: gate
13: lower mold block 14: cavity
15: manifold 16: resin passage
18: sprue 18a: sprue bush
21: valve body 22: inner passage
23: valve pin 41: molten resin storage cylinder
42: inner space 43: inlet port
50: plunger 51: upper
61: upper fixing plate 62b: first flow path
62a: second flow path 71: valve cylinder
72a: upper piston chamber 72b: lower piston chamber
75: piston 81: plunger holder
95a: hinge pin 91: connecting rod
93: center pin 92: head
94: link bar 95: operating lever
96: plunger holder 97: movable block
98: pinion 99: moving block

Claims (8)

An upper fixing plate 61; A manifold (15) having a resin passage (16) for distributing the molten resin extruded from the injection machine; An upper mold block 11 having a gate 12 and moving to approach the upper fixed plate 61 or spaced apart from the upper fixed plate 61 by a certain gap; A cavity 14 is formed together with the upper mold block 11, and when the upper mold block 11 is combined with the upper mold block 11, the cavity 14 is closed, and the upper mold A lower mold block 13 that opens the cavity 14 when separated from the block 11; A valve body 21 having an inner passage 22 connected to the resin passage 16 of the manifold 15 and coaxially communicated with the gate 12 of the upper mold block 11; It is provided to move between the upper and lower limits along the central axis direction of the inner passage 22 in the inner passage 22 of the valve body 21, and when positioned at the lower limit, the lower end of the upper mold block 11 A valve pin 23 for closing the gate 12 and opening the gate 12 at a lower end when it is positioned at the upper limit position; A valve pin actuator that operates the valve pin 23 so that the valve pin 23 moves between an upper limit and a lower limit; In the hot runner injection mold including; the upper fixing plate 61 on which the valve pin actuator is installed,
An inner space 42 is provided, and an inlet port 43 connecting the inner space 42 and the resin passage 16 of the manifold 15 is provided on the side wall, and the inner space 42 is a valve body. A molten resin storage cylinder 41 which is coaxially connected to the inner passage 22 of (21) and receives and stores the molten resin of the injection machine provided through the resin passage 16 by the predetermined volume; And
It is fixed to the upper fixing plate 61 and installed to reciprocate between a maximum retraction position forming a maximum volume and a maximum advance position forming a minimum volume in the molten resin storage cylinder 41, and the maximum retraction When reversing to the position, the inlet port 43 of the molten resin storage cylinder 41 is opened to fill the molten resin in the resin passage 16 by the maximum volume of the molten resin storage cylinder 41, and at the maximum retracted position When moving to the maximum forward position, the inlet port 43 is closed to prevent the molten resin in the resin passage 16 from flowing into the inner space 42 of the molten resin storage cylinder 41, and at the same time, the molten resin storage cylinder ( 41) a plunger (50) for discharging the molten resin stored in a predetermined volume by a predetermined volume; The method of claim 1,
The upper cover plate 17 is coupled to the upper side of the upper mold block 11, and the upper cover plate 17 is installed through a spring 17 with a certain gap below the upper fixing plate 61 And
When the upper cover plate 17 moves in a direction away from the upper fixed plate 61 by the elastic force of the spring 19, the plunger 50 is moved to the inner space of the molten resin storage cylinder 41 ( 42) The molten resin provided through the resin passage 16 of the manifold 15 from the injection machine by moving relative to the maximum retracted position while opening the inlet port 43 inside the inner space of the molten resin storage cylinder 41 Accommodate and store in the maximum volume in (42),
When the upper cover plate 17 moves toward the upper fixed plate 61, the plunger 50 blocks the inlet port 43 in the inner space 42 of the molten resin storage cylinder 41, while the maximum advance position A hot runner injection mold apparatus for quantitative static pressure discharge, characterized in that it moves relative to and discharges a certain amount of molten resin stored in the inner space 42 of the molten resin storage cylinder 41 toward the cavity 14. The method of claim 1,
The valve pin actuator,
A valve cylinder 71 that has an internal space and is provided on the upper fixing plate 61 with a first flow path 62b and a second flow path 62a for introducing or outflowing the working fluid into the internal space; The upper piston chamber 72a in which the first passage 62b communicates with the upper piston chamber 72a in which the first passage 62b communicates with the upper end of the valve pin 23 is connected to the upper end of the valve pin 23 and the lower piston in which the second passage 62a communicates Divided into a chamber 72b, as the working fluid selectively flows into the upper piston chamber 72a or the lower piston chamber 72b, it moves forward or backward in the inner space of the valve cylinder 71 to the valve pin 23 at the gate ( 12) a piston (75) for closing or opening the hot runner injection molding apparatus for quantitative static pressure discharge, comprising a. The method of claim 1,
Further comprising a plunger actuator for operating the plunger 50 in connection with the opening and closing operation of the cavity of the mold blocks 11 and 13,
When the lower mold block 13 is in close contact with the upper mold block 11 to close the cavity 14, the plunger actuator moves the plunger 50 to the maximum forward position, while the lower mold block ( When 13) is spaced apart from the upper mold block 11 to open the cavity 14, the plunger 50 is moved to a maximum retracted position. The method of claim 4,
The plunger actuator,
The upper end of the plunger 50 is connected to the plunger holder 96, and it is rotatably coupled to the upper fixing plate 61 of the mold around the hinge pin 95a, and is rotated around the hinge pin 95a. An operating lever 95 for moving the plunger 50 up and down while turning;
A connecting rod 91 having one end connected to one side of the lower mold block 13 so as to linearly reciprocate in connection with the opening and closing operation of the cavity of the lower mold block 13; And
One side is connected to the upper fixing plate 61 of the mold so that it can pivotally move around the center pin 93, and one end is connected to the operating lever 95, and the other end is connected to the tip of the connecting rod 91. A link bar 94 connected to the provided head 92 to move the plunger 50 in the vertical direction while turning around the center pin 93 in connection with the linear reciprocating motion of the connecting rod 91; A hot runner injection mold device for discharging a quantitative static pressure, characterized in that made. The method of claim 5,
The valve pin actuator is rotatably installed around a moving block 99 that is interlocked in the same direction as the direction of movement of the plunger 50 and has a latching portion on one side, and a pin fixed to the upper fixing plate 61 And a pinion 98 engaged with the rack gear portion of the movable block 99, and a movable block coupled to the upper end of the valve pin 23 and provided with a rack gear portion on one side to engage the pinion 98 ( 97), characterized in that the hot runner injection mold device for the quantitative static pressure discharge. A sprue 18 into which the molten resin extruded from the injection machine is introduced is installed, an upper fixed plate 61; A manifolder 15 having a resin passage 16 for distributing the molten resin provided through the sprue 18; An upper mold block 11 provided with a gate 12; A cavity 14 is formed together with the upper mold block 11, and when the upper mold block 11 is combined with the upper mold block 11, the cavity 14 is closed, and the upper mold A lower mold block 13 that opens the cavity 14 when separated from the block 11; It has an inner passage (22A), the inner passage (22A) communicates with the resin passage (16) of the manifold (15), and communicates with the gate (12) of the upper mold block (11) in a coaxial direction, In the hot runner injection mold apparatus including, an open gate valve body 21A installed on the upper mold block 11 so that the outlet is opened to the gate 12,
An inner space 42 is provided, and an inlet port 43 connecting the inner space 42 and the resin passage 16 of the manifold 15 is provided on the side wall, and the inner space 42 is a valve body. A molten resin storage cylinder 41 which is coaxially connected to the inner passage 22A of 21A and receives and stores the molten resin of the injection machine provided through the resin passage 16 by the predetermined volume; And
It is fixed to the upper fixing plate 61 and installed to reciprocate between a maximum retraction position forming a maximum volume and a maximum advance position forming a minimum volume in the molten resin storage cylinder 41, and the maximum retraction When reversing to the position, the inlet port 43 of the molten resin storage cylinder 41 is opened to fill the molten resin in the resin passage 16 by the maximum volume of the molten resin storage cylinder 41, and at the maximum retracted position When moving to the maximum forward position, the inlet port 43 is closed to prevent the molten resin in the resin passage 16 from flowing into the inner space 42 of the molten resin storage cylinder 41, and at the same time, the molten resin storage cylinder ( 41) a plunger (50) for discharging the molten resin stored in a predetermined volume by a predetermined volume; The method of claim 7,
The bottom surface of the upper fixing plate 61 is fixed to the upper side of the upper mold block 11 and by the elastic force of the spring 19 through the spring 19 interposed between the bottom surface of the upper fixing plate 61 Further provided with a cover plate (17) installed spaced apart by a certain distance and,
When the cover plate 17 moves so that the upper surface of the cover plate 17 is in close contact with the bottom surface of the upper fixing plate 61, the plunger 50 is moved to the maximum forward position in the molten resin storage cylinder 41. Meanwhile, when the upper surface of the cover plate 17 is separated from the lower surface of the upper fixing plate 61 by the elastic force of the spring 19, the plunger 50 is moved to the maximum retracted position. Hot runner injection mold device for constant static pressure discharge.

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