KR102222831B1 - screw cap injection molded device - Google Patents

Abstract

The present invention relates to a screw cap injection mold device capable of increasing the efficiency, accuracy and reliability of an ejection process of an injection mold. The screw cap injection mold device comprises: a fixed-side mold having a resin injection hole for injecting a molten resin into cavity; and a movable-side mold coupled to a lower portion of the fixed-side mold, wherein the movable-side mold includes: a lower mold including a leg spaced apart and coupled between a lower fixed plate and a support plate; a drive shaft coupled to the lower fixed plate so as to be rotatable between the lower fixed plate and the support plate and rotating forward and backward according to the operation of a up-and-down ejector plate; a return pin coupled to the ejector plate and having a knockout rod penetrating through the support plate and protrudes to an upper surface thereof by the operation of the ejector plate; and a return spring inserted into the return pin to return the ejector plate; and a stripper mold including a stripper plate 1 having a stripper core coupled to a lower part of the fixed-side mold and provided with a fixed core coupling hole coupled to the cavity on an upper surface, and having a knockout hole raised by contact of the knockout rod on one side thereof, and a stripper plate 2 in which a fixed core is positioned in the cavity of the movable-side mold to mold a screw cap product and which is coupled to the drive shaft to surround a rotating core rotating forward and backward, passes the knockout rod of the return pin through the knockout hole, and is coupled between the support plate and the stripper plate 1.

Description

Screw cap injection molded device

The present invention relates to an injection mold apparatus for injection molding a screw cap product having a helical structure using a rotary core, and more specifically, a rotary core coupled to an undercut of a molded product when the molded product is taken out. And it relates to a screw cap injection mold apparatus capable of rapidly separating and discharging a molded product by quickly and accurately stripping the fixed core coupled thereto and the core coupled to the fixed core.

The injection mold device injects a melt into a cavity formed by molding a pair of molds together, and when the melt, such as a resin filled in the cavity, solidifies, a series of processes in which the molded product is separated from the cavity with an ejector pin and taken out. It means an apparatus for molding a product through, and such an injection mold apparatus is apparent to those of ordinary skill in the art.

In particular, in order to injection mold screw caps such as screwed bottle caps, if the fixed mold that forms the cavity and the movable mold that has a core for molding the molded product are just separated after the molding is completed, the spiral of the injection material meshed with the core of the mold. The structure is damaged or collapsed. Therefore, an injection mold for molding a screw cap product having a spiral structure must have a separate driving device for rotating the core.

In other words, unlike general plastic molded products, injection mold devices that manufacture molded products with screws require a separate take-out device that separates the molded product by rotating the screw core in order to separate and discharge the molded product with the screw from the mold. .

In particular, in the case of a molded product having a plastic screw having a directionality, the position of the molded product's body and the cap may be different, so if the screw start position and the position of the rotary core are not matched, it is of little use as a screw cap . This problem is more serious when a plurality of threaded cores are installed.

Examples of the majority of injection mold apparatuses in which a molded product in which a screw is molded without a rotational power such as a motor is separated from the mold and taken out and discharged, as in Patent Document 1 (Patent No. 1010406, registered on January 17, 2011) and Patent Document 2 (Patent Document 2). There is a mold apparatus described in No. 1421378, 2014.07.14. registration). The injection mold devices disclosed in Patent Documents 1 and 2 include a drive gear that rotates in conjunction with the rotation of a driving screw rotated by an up-and-down operation of the ejector plate after the fixed mold and the movable mold are opened, The mold configuration was complicated by configuring four driven gears having a rotating core in engagement with the driving gear.

In addition, the screw cap injection mold apparatus according to the prior art, even if the screw cap is separated from the rotating core, the molten resin is injected into the cavity to keep the screw cap molded product sticking to the stripper plate or the stripper core during molding. There was an inconvenience of having to use a separate molded product rake.

10-1010406 B1 (Registration on Jan 17, 2011) 10-1421378 B1 (2014.07.14 registered)

The present invention has been conceived to solve the above problems, and provides a screw cap injection mold apparatus for injection molding a screw cap by rotating a rotary core having a screw molding part formed using only a drive shaft that is rotated by an up-and-down operation of an ejector plate. Is in.

Another object of the present invention is to separate the screw cap molded article from the rotating core by rotating the rotating core located in the cavity only with the driving shaft rotated by the vertical operation of the ejector plate, and by raising the return pin at high speed by the stripper line of the driving shaft. It is to provide an injection mold apparatus that is operated to quickly and accurately separate and take out the undercut of the screw cap from the mold from the mold by hitting the stripper plate on which the stripper core is installed.

Another object of the present invention is to separate the screw cap molded article and the screw core by the operation of the first section of the ejector plate, and strike the stripper plate with the return pin installed on the ejector plate by the operation of the second section of the ejector plate. It is to provide an injection mold device capable of separating and removing molded products from the core.

The screw cap injection mold apparatus of the present invention for achieving the above object includes a fixed side mold having a resin injection port for injecting a molten resin into a cavity, and a movable side mold coupled to a lower portion of the fixed side mold. side mold); The movable-side mold is coupled to a spacer block spaced apart between a movable clamping plate or bottom plate and a support plate, and a spacer block that is rotatable between the fixed top plate and the support plate. A driving axle that is rotated forward and backward according to the operation of the ejector plate, which is operated up and down, and a knockout rod that is coupled to the push plate and penetrates the base plate by the operation of the push plate and protrudes to the upper surface thereof. a movable lower mold having a return pin having a rod and a return spring fitted to the return pin to return the push plate; A stripper core coupled to the lower part of the fixed side mold and having a fixed core coupling hole coupled to the cavity on an upper surface is provided, a knockout hole is formed on one side, and the knockout rod contacts the inner end of the knockout hole A stripper plate 1 (1nd stripper plate) that rises as a result, and a rotary type core that is positioned in the cavity of the movable mold for forming screw cap products and coupled to the drive shaft to rotate forward and reverse. A fixed core is installed on the upper surface, the knockout rod of the return pin passes through the knockout hole, and includes a stripper mold composed of a stripper plate 2 coupled between a base plate and the stripper plate 1; The stripper plate 1 moves to the upper portion of the stripper plate 2 by pushing the inside of the knockout hole upward by the knockout rod of the return pin when the hemispherical projection of the push plate enters the stripper line via the spiral line of the drive shaft. It is characterized by being stripped.

The drive shaft is composed of two rows of a spiral section in which a screw is formed in a form surrounding a circumference and a screw valley of a straight stripper line extending thereto, and the screw bones of the two rows protrude in a hemispherical shape to face each other from the push plate. It is characterized by being guided to the hemispherical projection of the dog and rotating.

The stripper plate 2 is an elastic support installed on the upper surface of the base plate when the screw-forming part of the rotary core coupled to the screw of the product molded in the cavity by rotation of the drive shaft is separated from the screw of the product. It is characterized in that it is stripped to the upper portion of the base plate by.

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The elastic support portion is characterized in that the stripper spring and the urethane parting lock are fixedly installed to be spaced apart from each other on the upper surface of the support plate.

The push plate moves up and down with rotational resistance when the hemispherical protrusion contacts the screw valley of the spiral line, and when the hemispherical protrusion contacts the stripper line via the spiral line, it quickly rises and descends without rotational resistance to knock out the return pin. It is characterized in that the rod strikes the stripper plate 1 upward and strips it to the upper part of the stripper plate 2.

In the screw cap injection mold apparatus according to an embodiment of the present invention, the rotating core is stripped from the molded product by the rotation of the drive shaft driven by the operation of the pushing plate to take out the molded product, and when the pushing plate is lifted By completely removing the stripped molded product from the mold by the knockout rod formed at the end of the return pin, the structure of the injection mold can be simplified without the meshing of a plurality of rotation gears.

In addition, in the present invention, during the mold opening and closing operation, the rotary core is sequentially rotated by the operation of the rolling plate to strip the rotary core from the molded product, and then the molded product is completely separated and removed from the mold with a knockout rod provided on the return pin. The efficiency, accuracy and reliability of the mold take-out process can be high.

1 is a perspective view of a screw cap injection mold apparatus according to a preferred embodiment of the present invention.
2 is a front cross-sectional view and a side cross-sectional view of the screw cap injection mold apparatus shown in FIG. 1
Figure 3 is a front view and a side view of the drive shaft installed in the movable side mold shown in Figure 2;
4 to 6 are front and side cross-sectional views for explaining an operating state of the injection mold apparatus shown in FIG. 2.
7 is an enlarged view of portions 4A, 5A, and 6A shown in FIGS. 4 to 6;
8 is an enlarged view of portions 24B and 6B shown in FIGS. 4 and 6;

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In addition, in describing the present invention, a detailed configuration and description thereof in which the structure and operation can be easily recognized by a person of ordinary skill in the art may be omitted.

1 is a perspective view of an injection mold apparatus according to a preferred embodiment of the present invention, FIG. 2 is a front sectional view and a side sectional view of the injection mold apparatus 1, and FIG. 3 is a drive shaft installed in the movable side mold shown in FIG. It is a front view and a side view. In the drawings shown in FIGS. 2 and 3 and FIGS. 4 to 6 to be described later, the left side is a front cross-sectional view, and the right side is a side cross-sectional view.

1 to 3, the screw cap injection mold apparatus (hereinafter referred to as'injection mold apparatus') 1 according to an embodiment of the present invention is a drive shaft that is rotated forward and backward by the vertical operation of the push plate 90 Positioned inside the cavity 32 by the rotation of 100 and the knockout rod 98 formed at the end of the return pin 93 operated up and down according to the operation of the push plate 90 The screw cap formed product 3 is separated from the core by rotating the threaded portion 43 of the rotary core 44.

To this end, the injection mold device 1 is a movable side mold 7 is coupled to a fixed side mold 5 that can be separated (released or opened) and combined (joined) from each other. Has the form.

In the fixed mold 5, a fixed mold plate or cavity plate 30, a runner stripper plate 20, and a fixed clamping plate or top plate 10 are sequentially stacked. It is composed of a structure that is combined.

And the movable side mold 7 is a movable clamping plate or bottom plate 80, a lower seal plate (ejector plate lower side) (96), a sliding plate (90) composed of an upper seal plate (ejector plate upper side) (95). ), a stripper mold in which strippers 1 and 2 (40, 50) are stacked on top of a lower mold plates 8 composed of a spacer block 70 and a support plate 60 stacked. It consists of stripper mold plates)(9).

In the above configuration, the upper fixing plate 10 to which the locate ring 11 including the injection hole 12 and the through 13 is coupled, the runner plate 20 forming the runner 21, and the runner 21 communicate with each other. Resin injection and deployment operation of the fixed-side mold 5 consisting of the upper plate 30 having the upper core 33 having the gate 31 and the cavity 32 formed therein, and the fixed-side mold 5 and the movable mold Since the bonding relationship between the plate members constituting (7) is similar to that of an ordinary injection mold apparatus, a detailed description thereof will be omitted.

And a guide pin 63 and an oil bush (not shown) for guiding separation and coupling between the fixed side mold 5 and the movable side mold 7 are provided, and the guide pin 63 and the oil bush slide together. While being bound, it guides the separation and coupling operation between the fixed mold 5 and the movable mold 7.

In addition, an upper core plate 33 in which a cavity 32 for molding a cap product having a spiral structure is formed is installed on the upper plate 30 of the fixed-side mold 5. The upper core 33 is combined internally and externally together with the threaded portion 43 of the rotary core 44 to be described later to form a cap-molded product 3 having a helical structure on the inner circumferential surface.

In particular, as a configuration for shaping the helical structure of the screw cap molded product 3, a rotary core 44 is provided, and the rotary core 44 at this time is a screw molded portion at the tip located in the cavity 32 In addition to forming the helical structure of the cap product by using 43, it is possible to escape from the helical structure of the cap-molded product 3 while rotating.

This rotary core 44 is a circular bar shape having a predetermined length, and is installed in a vertically vertically penetrating the stripper plate 1 (40) and the stripper plate 2 (50) in the movable side mold (7).

The stripper plate 1 (40) is a stripper core (41) in which a serrated protrusion (46) formed on the upper end of the fixing core (42) is formed with a fixed core coupling hole (41a) penetrated to be located at the bottom of the cavity (32). Has. The fixed core 42 coupled to the fixed core coupler 41a of the stripper plate 1 40 is fixedly coupled to the lower core 53 coupled to the upper surface of the stripper plate 2 50. The upper surface of the fixed core 42 is for forming a parting line of the rim of the bottom surface of the molded product 3.

The lower core 53 of the stripper plate 2 50 is a key holder core that prevents rotation by inserting a fixing protrusion 45 protruding under the fixing core 42. The fixed core 42 is disposed concentrically around the rotary core 44 and is installed in a structure that is fixed to the stripper plate 2 50.

The upper end of the fixed core 42 installed as above is located in the cavity 12 formed in the upper core 33 of the upper plate 30 of the fixed side mold 5 and is formed around the lower end of the cap product. It plays a role in shaping the serrated key.

The inside of the fixed core 42 which is fixed to the stripper plate 2 (50) and located inside the cavity 32 through the fixed core coupling hole (41a) of the stripper plate 1 (40) is a rotary core (44). Is located. The rotational core 44 having the screw forming portion 43 formed on the upper end thereof is formed in the cavity 32 through the hole 54 formed in the stripper plate 2 50 and the core 53 fixedly coupled thereto. Is located in

At this time, the rotary core 44 is a fixing pin 64 to the drive shaft 100 rotatably coupled between the base plate 60 and the fixed plate 80 installed under the stripper plate 2 (50). It is coupled, and the stripper plate 2 (50) is elastically supported in an upward direction by an elastic support portion coupled to an upper portion of the base plate (60). The elastic support may be a stripper spring 61 and a urethane parting lock 62 installed on the upper surface of the base plate 60.

In addition, the stripper plate 2 (50), which is elastically supported in the upward direction by the elastic support portion of the support plate 60, is coupled by a three-stage rod 51, so that the stripper plate 2 (50) is formed by the elastic support portion. When stripping to the top of 60) does not exceed the length of the gap 52 set by the three-stage rod 51.

The injection mold apparatus 1 according to the embodiment of the present invention is an example of a configuration in which the strupper plate 2 50 is elastically supported upward by an elastic support portion composed of a struff spring 51 and a urethane parting lock 62. Holding it.

The base plate 60 is fixed to the upper part of a spacer block 70 installed on the upper part of the fixed plate 80, and the support plate 60 penetrates the leg 70 installed on the upper part of the fixed plate 80. It is fixed by the combined support pin 71 and the ejector guide pin (EGP: ejector guide pin) 91.

At this time, the leg 70 is a block that creates a space so that the base plate 90 can move up and down when the molded product is removed from the mold, and the two strippers 1 and 2 (40, respectively) are located above the support pin 71. A tensile rod 55 penetrating through 50 is coupled.

Between the support plate 60 and the fixed plate 80, a driving shaft 100 that rotates forward/reverse for a predetermined period by the vertical operation of the push plate 90 is installed. The lower end of the drive shaft 100 can be rotated to the fixed plate 80 by the bearing 82 so as to be rotatable after being fastened with a nut 83 in the drive shaft hole 81 formed on the bottom surface of the fixed plate 80 And the upper portion of the drive shaft 100 penetrates the base plate 60, and a fixing pin 64 is inserted into the rotary core 44 inserted into the hole 54 of the stripper plate 2 50 to be firmly coupled. And is rotatably coupled by a bearing 65 at the top of the base plate 60.

The pressing plate 90 is configured in a form in which an upper sealing plate 95 and a lower sealing pin 96 are stacked and coupled by a bolt 97, and an ejector pin 70 is interposed between the upper and lower sealing plates 65 and 96. A guide ring 80 and a return pin 93 for guiding the elevating of the push plate 90 along the) are coupled.

A return spring 94 is installed around the return pin 93, and at the end, when the push plate 90 rises to the highest point, the base plate 60 and the stripper plate 2 50 penetrate through the stripper plate 1 ( A knockout rod hitting a knockout hole formed in 40) is formed.

In an embodiment of the present invention, the return pin 93 has a knockout step 98 having a different diameter in a rod shape, and the upper rod having a small diameter is a stripper plate 2 (50) and a stripper plate 1 (40). The step 98 of the lower rod, which penetrates through the hole formed in and protrudes to the top and has a large diameter, passes through the hole of the stripper plate 2 (50) and strikes the knockout hole of the stripper plate 1 (40) upward. Although configured, various modifications may be made so that the stripper plate 1 (40) is not separated from the stripper plate 2 (50) when the mold is separated.

The driving shaft 100 rotated for a certain period by the vertical operation of the pushing plate 90 between the base plate 60 and the fixed plate 80 is a spiral section in which a screw is formed in a shape surrounding the circumference as shown in FIG. A (spiral line) 102 and a straight stripper section 101 extending therefrom are formed.

The thread 104 of the spiral section 102 and the stripper section 101 is formed by digging into two rows so as to be symmetrical to each other, and the two valleys 104 have a lower sealing plate 96 as shown in FIG. Rotating guide balls (hemispherical protrusions) 103 protruding in a hemispherical shape to face each other in the hole of the are coupled.

Therefore, when the push plate 90 is moved upward by the operation of the ejector pin (not shown) of the injection machine by the above configuration, the spiral section 102 and the stripper section 101 formed on the outer circumferential surface of the drive shaft 100 ) Of the valley 104 is guided and rotated along the hemispherical protrusion 103 formed on the push plate 90.

With the above configuration, it can be seen that the rotation of the rotary core 44 of the injection mold 1 according to the present invention rotates forward and backward according to the vertical operation of the push plate 90.

4 to 6 are cross-sectional views showing an operating state of the injection mold apparatus 1 according to a preferred embodiment of the present invention, in which the left side is a front cross-sectional view, and the right side is a side cross-sectional view. 7 is an enlarged view of portions 4A, 5A, and 6A shown in FIGS. 4 to 6, and FIG. 8 is an enlarged view of portions 24B and 6B shown in FIGS. 4 and 6.

As shown in Fig. 2, in a state in which the fixed-side mold 5 and the movable-side mold 7 are combined (molded), the resin passage, that is, the injection port 12, the sprue 13, and the runner 21 And when the injection molding resin is injected through the gate 31, the cavity 32 is filled.

After filling the resin, a certain period of time elapses, and after the molding of the screw cap product 3 is completed in the cavity 32, the cap is separated (released) from the fixed-side mold 5 and the movable mold 7 is performed. The product 3 can be taken out. For example, the movable-side mold 7 is lowered so that the fixed-side mold 5 and the movable-side mold 7 are separated as shown in FIG. 4.

When the movable-side mold 7 and the fixed-side mold 5 are separated as shown in FIG. 4, the molded product 3 is separated from the cavity 32 and Maintains the form sticking to the threaded portion (43). That is, as shown in 4A of FIG. 7, the threaded portion (screw undercut) of the molded product 3 maintains a state coupled to the threaded portion 43 of the rotary core 44, and The under cut (UC1) of the lower circumference and the anti-reverse rotation prevention protrusion 46 is attached to the serrated protrusion 46 of the stripper core 41 and the fixed core 42 of the stripper plate 1 (40). Keep.

4, in a state where the movable-side mold 7 is separated from the fixed-side mold 5, the shaft of an actuator such as a hydraulic cylinder provided on the bottom of the fixed plate 80 of the movable-side mold 7 (not shown) When the ejector pin (not shown) connected to the pusher pin (not shown) pushes the push plate 90 upward, the spiral line 102 of the drive shaft 100 and the valley 104 of the stripper line 101 are hemispherical protrusions formed on the push plate 90 It is rotated by being guided to 103.

When the pushing plate 90 moves upward to the end of the spiral line 102 of the drive shaft 100, the rotary core 44 is rotated so that the screw forming portion 43 formed at the end thereof is formed into a molded product (3). By being separated from the screw of the stripper plate 2 (50) laminated and bonded to the upper portion of the support plate 60 is separated from the support plate (60). Accordingly, the stripper plate 2 (50) rises more smoothly to the top by the elasticity of the stripper spring 61 and the urethane parting lock 62 installed on the base plate 60 and is stripped as shown in FIG. 5.

At this time, the stripping length between the base plate 60 and the stripper plate 2 50 is the same as the length of the gap 52 set by the three-stage rod 51, and the return pin 93 is a return spring due to the rise of the push plate 90. It rises to the top while compressing (94). By such an operation, the step 98, which is a knockout rod formed on the upper portion of the return pin 93, is positioned inside the knockout hole of the stripper plate 1 (40).

As shown in FIG. 5, even in the state where the screwed portion 43 of the rotary core 44 is separated from the screwed portion of the molded product 3, the undercut of the circumferential lower portion of the molded product 3 and the reverse rotation preventing protrusion 46 cut) (UC1) is the molded product without a separate rake device by maintaining a state attached to the serrated protrusions of the stripper core 41 and the fixed core 42 of the stripper plate 1 (40) as shown in 5A of FIG. (3) cannot be taken out of the injection mold apparatus (1).

When the hemispherical protrusion 103 formed on the push plate 90 by the continuous rise of the push plate 90 enters the straight section of the stripper line 101 of the drive shaft 100, the rotation of the drive shaft 100 stops and the rotation resistance decreases. By disappearing, the pusher plate 90 will be transported to the upper part at a higher speed, and by this operation, the step 98 of the return pin 93 hits the inner end of the knockout hole of the stripper plate 1 (40), and the stripper plate Quickly strip 1 (40) to the upper part as shown in FIG. 6.

Accordingly, the undercut UC1 of the molded product 3 as shown in FIG. 5A is coupled to the stripper core 41 of the stripper plate 1 40 as well as the stripper plate 2 50 as shown in FIG. 6 or 6A of FIG. It is easily separated (striped) from the top-toothed protrusion of the fixed core 42 and taken out to the outside of the injection mold apparatus 1.

As described above, the injection mold apparatus 1 according to the embodiment of the present invention is, first, a product molded inside the cavity 32 by the separation (release) of the fixed side mold 5 and the movable side mold 70 Separate the parting in (3).

Secondly, when the hemispherical protrusion 103 formed on the push plate 90 that operates up and down guides the spiral line 102 of the drive shaft 100 to rotate the drive shaft 100, it rotates at the threaded portion of the molded product 30. The stripper plate 2 (50) is separated from the base plate (60) by separating the threaded portion (43) of the typical core (44).

Third, when the hemispherical protrusion 103 formed on the push plate 90 passes through the spiral line 102 of the drive shaft 100 and enters the stripper line 101, the knockout rod formed at the end of the return pin 93 The undercut of the molded product 30 attached to the fixed core 43 of the stripper plate 2 (50) and the stripper core 41 of the stripper plate 1 (40) by raising the stripper plate 1 (40) by a step 98 ( By separating the UC1) and discharging the molded product 3 to the outside of the injection mold apparatus 1, the ejection operation of the molded product 3 in the injection mold apparatus 1 can be quickly and accurately performed.

After the molded product 3 is taken out, the fixed-side mold 5 and the movable-side mold 7 are recombined, and the ejector pin goes out to the lower portion of the pushing plate 90. At this time, the push plate 90 and the return pin 93 are transferred to the lower part by the return spring 94 coupled to the outer circumferential surface of the return pin 93, and the injection mold device 1 is reversed from the above-described operation. Works as

The above detailed description of the present invention is given for illustrative purposes. It is obvious to those skilled in the art that many changes and modifications can be made without departing from the scope of the present invention. Therefore, the whole of the above technology is not limited to the exemplified ones of the present invention, and should be defined and interpreted only by the claims.

1: screw cap injection mold,
3: Molded product (screw cap)
5: fixed side mold,
7: movable side mold,
8: lower mold,
9: stripper mold,
10: upper fixed plate,
11: locate ring, 12: injection port, 13: sprue,
20: runner plate (upper stripper)
21 runner,
30: Senate plate (fixed side template),
31: gate, 32: cavity, 33: upper core,
40: stripper plate 1
41: stripper core, 41a: fixed core fitting, 42: fixed core, 43: threaded portion, 44: rotary core,
45: fixed protrusion, 46: reverse rotation preventing protrusion,
50: stripper plate 2
51 three-stage rod, 52: gap, 53: harcore, 54: hole, 55: tension rod.
60: base plate,
61 stripper spring, 62: urethane parting locks, 63: guide pin,
64: rotary core coupling pin, 65: bearing,
70: leg,
71: support pin.
80: Hagojeongpan,
81: drive shaft hole, 82: bearing, 83: nut
90: ejector plate
91: discharge guide pin (EGP), 92: guide ring, 93: return pin,
94: return spring, 95: upper sealing plate; 96: lower sealing plate, 97: bolt, 98: step difference (knockout rod)
100: drive shaft (ball screw: ball screw)
101: spiral line (2-row screw), 102: stripper line, 103: rotation guide ball (hemispherical protrusion)

Claims (6)

In the screw cap injection mold device,
A fixed-side mold having a resin injection port for injecting a molten resin into the cavity, and a movable-side mold coupled to a lower portion of the fixed-side mold;
The movable-side mold is coupled to the fixed plate so as to be rotatable between the fixed plate and the support plate, and a drive shaft that is rotated forward/reverse according to the operation of the push plate operated up and down so as to be rotatable between the fixed plate and the support plate. , A lower mold having a return pin coupled to the push plate and having a knockout rod 98 protruding to an upper surface thereof by penetrating the support plate by the operation of the pushing plate, and a return spring fitted to the return pin to return the push plate;
A stripper core coupled to the lower portion of the fixed side mold and having a fixed core coupling hole coupled to the cavity on an upper surface thereof, a knockout hole is formed on one side, and a stripper rising by contacting the knockout rod at an inner end of the knockout hole Plate 1 and screw cap A fixed core is installed on the upper surface in a form surrounding a rotating core that is positioned in the cavity of the movable mold and rotates forward/reverse by being coupled to the drive shaft for product molding, and the knockout rod of the return pin. And a stripper mold made of a stripper plate 2 that penetrates through the knockout hole and is coupled between the base plate and the stripper plate 1;
The stripper plate 2 is the support plate by an elastic support installed on the upper surface of the support plate when the screw-forming part of the rotary core coupled to the screw of the product molded in the cavity by rotation of the drive shaft is separated from the screw of the product. The stripper plate 1 extends to the spiral line through a spiral line in which a screw is formed in a form in which hemispherical protrusions protruding from the push plate to face each other surround the circumference of the drive shaft and extends to the stripper line in a straight line. When entering, the knockout rod of the return pin is stripped to the upper portion of the stripper plate 2 by pushing the inside of the knockout hole upward.
The method of claim 1, wherein the drive shaft is a spiral section in which a screw is formed in a form surrounding a circumference, and a screw valley of a straight stripper line extending thereto is composed of two rows so as to be symmetrical to each other, and the screw bones of the two rows face each other in the push plate. Screw cap injection mold device, characterized in that the guide is rotated by being guided by two hemispherical protrusions protruding in a hemispherical shape.
delete delete [3] The screw cap injection mold apparatus according to claim 1 or 2, wherein the elastic support part has a stripper spring and a urethane parting lock spaced apart from each other and fixedly installed on an upper surface of the base plate.
The method of claim 2, wherein the push plate is operated up and down with rotational resistance when the hemispherical protrusion contacts the screw valley of the spiral line, and when the hemispherical protrusion contacts the stripper line via the spiral line, it is quickly without rotational resistance. The screw cap injection mold apparatus, characterized in that the knockout rod of the return pin hits the stripper plate 1 upwardly and strips the stripper plate 2 upwardly.

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