CN215849522U - Three-color extrusion die - Google Patents

Abstract

Embodiments of the present disclosure disclose a three-color extrusion die. This three-colour extrusion die includes: the device comprises a forming plate, a fixing plate and an insert pin. The molding plate comprises a first injection molding plate, a second injection molding plate and a third injection molding plate. An injection molding plate is provided with an injection nozzle, an injection cavity, an injection flow channel and an injection boss. The first injection boss is internally provided with a second injection inner diameter forming hole. The two-shot molding plate is provided with a two-shot cavity, a three-shot cavity and a two-shot outer diameter molding hole. The three-shot forming plate comprises three-shot forming holes. The centers of the first injection molding plate, the second injection molding plate, the third injection molding plate and the fixing plate are all provided with pin holes. The insert pin is arranged in the insert pin hole. Therefore, a first layer of rubber material can be prepared through the gap between the second injection inner diameter forming hole and the insert pin, a second layer of rubber material can be prepared through the gap between the second injection outer diameter forming hole and the first injection boss, and a third layer of rubber material can be prepared through the gap between the third injection forming hole and the second layer of rubber material. Thus, an article having three layers of gum can be produced at a time.

Description

Three-color extrusion die

Technical Field

The embodiment of the disclosure relates to the technical field of extrusion dies, in particular to a three-color extrusion die.

Background

The extrusion mold is installed in the front end of extruder and used in making pipe and other shaped material.

However, the above extrusion dies currently used in production often have the following technical problems: an article with three layers of sizing material cannot be made at once.

SUMMERY OF THE UTILITY MODEL

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

Some embodiments of the present disclosure propose tri-color extrusion dies to address the technical problems mentioned in the background section above.

In a first aspect, some embodiments of the present disclosure provide a three-color extrusion die, which includes a molding plate, a fixing plate, and an insert pin, where the molding plate includes a first injection molding plate, a second injection molding plate, and a third injection molding plate, where the fixing plate is provided with a first vent hole and a second vent hole, where the first vent hole and the second vent hole are vertically communicated with each other, the first vent hole communicates with an inside and a first surface of the fixing plate, and the second vent hole communicates with an inside and a side surface of the fixing plate; the injection molding plate is positioned on the second surface of the fixing plate, and is provided with an injection nozzle, an injection cavity, an injection flow channel and an injection boss, wherein the injection nozzle is arranged on the side surface of the injection molding plate, the injection cavity is arranged on the first surface of the injection molding plate, the injection flow channel is communicated with the injection nozzle and the injection cavity, the injection boss is internally provided with two injection inner diameter molding holes, the injection boss is arranged in the center of the second surface of the injection molding plate, and the two injection inner diameter molding holes vertically penetrate through the injection boss and the injection molding plate and are communicated with the injection cavity; the two-shot forming plate is positioned on the second surface of the one-shot forming plate, the two-shot forming plate is provided with a two-shot cavity, a three-shot cavity and a two-shot outer diameter forming hole, wherein the two-shot cavity is arranged on the first surface of the two-shot forming plate, the three-shot cavity is arranged on the second surface of the two-shot forming plate, the two-shot outer diameter forming hole is arranged in the center of the two-shot forming plate and vertically penetrates through the two-shot forming plate, the two-shot outer diameter forming hole is communicated with the two-shot cavity and the three-shot cavity, and the one-shot boss is inserted into the two-shot outer diameter forming hole; the three-injection molding plate is positioned on the second surface of the two-injection molding plate and comprises three-injection molding holes, and the three-injection molding holes are arranged in the center of the three-injection molding plate and vertically penetrate through the three-injection molding plate; the fixed plate and the first injection molding plate are both provided with two-jet-flow-channel holes, the two-jet-flow-channel holes arranged on the fixed plate are respectively communicated with the two-jet-flow-channel holes arranged on the first injection molding plate, and the two-jet-flow-channel holes arranged on the first injection molding plate are respectively communicated with the two-jet mold cavity; the first injection molding plate and the second injection molding plate are respectively provided with two three-jet-flow-channel holes, the two three-jet-flow-channel holes arranged on the first injection molding plate are respectively communicated with the two three-jet-flow-channel holes arranged on the second injection molding plate, the two three-jet-flow-channel holes arranged on the first injection molding plate are respectively communicated with the first injection cavity, and the two three-jet-flow-channel holes arranged on the second injection molding plate are respectively communicated with the third injection cavity; the center of the first injection molding plate, the center of the second injection molding plate, the center of the third injection molding plate and the center of the fixing plate are all provided with pin inserting holes, the pin inserting holes arranged on the first injection molding plate, the second injection molding plate and the third injection molding plate are communicated with the pin inserting holes arranged on the fixing plate, and the pin inserting holes arranged on the fixing plate are communicated with the first exhaust hole and the second exhaust hole; the insert pin is arranged in the insert pin hole, an air inlet hole is arranged in the insert pin, and the air inlet hole vertically penetrates through the insert pin.

Optionally, a center line of the first exhaust hole is perpendicular to a center line of the second exhaust hole, and a size of the first exhaust hole is larger than a size of the second exhaust hole.

Optionally, an included angle between a horizontal vertical bisector of the injection runner and a horizontal vertical bisector of the injection cavity is 30 °.

Optionally, the shape of the injection boss is an inverted funnel shape.

Optionally, the three-shot molding plate further comprises a clearance groove, wherein the clearance groove is disposed in the center of the second surface of the three-shot molding plate.

Optionally, a central connecting line of the two jet flow channel holes formed in the first injection molding plate is perpendicular to a central connecting line of the two three jet flow channel holes formed in the first injection molding plate.

Alternatively, the same corners of the first injection-molded plate, the second injection-molded plate, the third injection-molded plate and the fixing plate may be provided with chamfers having the same size, and when the first injection-molded plate, the second injection-molded plate, the third injection-molded plate and the fixing plate are coupled, the chamfers provided on the first injection-molded plate, the second injection-molded plate and the third injection-molded plate may be flush with the chamfers provided on the fixing plate.

Optionally, the first injection molding plate, the second injection molding plate, the third injection molding plate and the fixing plate are all provided with four mounting holes, and the mounting holes provided on the first injection molding plate, the second injection molding plate and the third injection molding plate are respectively communicated with the mounting holes provided on the fixing plate.

Optionally, the first injection molding plate, the second injection molding plate, the third injection molding plate and the fixing plate are all provided with two positioning pin holes, and the positioning pin holes provided on the first injection molding plate, the second injection molding plate and the third injection molding plate are respectively communicated with the positioning pin holes provided on the fixing plate.

The above embodiments of the present disclosure have the following beneficial effects: with the tri-color extrusion die of some embodiments of the present disclosure, an article having three layers of compound may be made at once. In particular, the reason why it is not possible to produce an article with three layers of gum at a time is that: the number of the flow channel holes and the number of the corresponding cavities are not enough, so that three layers of silica gel can not flow into the mold at one time. Based on this, some embodiments of the present disclosure provide a three-color extrusion die including a forming plate, a fixing plate, and an insert pin. The molding plate comprises a first injection molding plate, a second injection molding plate and a third injection molding plate. The injection molding plate is provided with an injection nozzle, an injection cavity, an injection flow channel and an injection boss. The first injection boss is internally provided with a second injection inner diameter forming hole. The two-shot molding plate is provided with a two-shot cavity, a three-shot cavity and a two-shot outer diameter molding hole. The three-shot molding plate comprises three-shot molding holes. The fixed plate and the injection molding plate are both provided with two jet flow channel holes. The first injection molding plate and the second injection molding plate are both provided with two three-jet flow channel holes. The centers of the first injection molding plate, the second injection molding plate, the third injection molding plate and the fixing plate are all provided with pin embedding holes. The insert pin is arranged in the insert pin hole. And because the enough number of flow passage holes and corresponding cavities are arranged, three layers of silica gel can be flowed in at one time. Therefore, the first layer of sizing material can be prepared through the gap between the two-shot inner diameter molding hole and the insert pin. And a second layer of sizing material can be prepared through the gap between the two-shot outer diameter forming hole and the one-shot boss. And a third layer of sizing material can be prepared through the gap between the three injection molding holes and the second layer of sizing material. Thus, an article having three layers of gum can be produced at a time.

Drawings

The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements. It should be understood that the drawings are schematic and that elements and elements are not necessarily drawn to scale.

FIG. 1 is a schematic structural view of some embodiments of a tri-color extrusion die according to the present disclosure;

fig. 2 is a schematic structural view in vertical section of a tri-color extrusion die according to the present disclosure.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.

In the description of the present disclosure, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

It should be noted that, for the convenience of description, only the parts relevant to the related disclosure are shown in the drawings. The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.

Further, in the description of the present disclosure, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", and the like are based on the direction or positional relationship shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the above-described devices or elements must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure.

It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.

It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.

The names of messages or information exchanged between devices in the embodiments of the present disclosure are for illustrative purposes only, and are not intended to limit the scope of the messages or information.

The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of some embodiments of a tri-color extrusion die according to the present disclosure. Fig. 2 is a schematic structural view in vertical section of a tri-color extrusion die according to the present disclosure. Fig. 1 includes a fixed plate 1, a one-shot molded plate 2, a two-shot molded plate 3, and a three-shot molded plate 4. Fig. 2 includes a fixing plate 1, a first injection molding plate 2, a second injection molding plate 3, a third injection molding plate 4, an insert pin 5, a first exhaust hole 6, a second exhaust hole 7, an injection nozzle 8, a first injection cavity 9, a first injection runner 10, a first injection boss 11, a second injection inner diameter molding hole 12, a second injection cavity 13, a third injection cavity 14, a second injection outer diameter molding hole 15, a third injection molding hole 16, an air inlet 17 and an evacuation groove 18.

In some embodiments, the three-color extrusion die may include a molding plate, a fixing plate 1, and an insert pin 5. The molding plates may include a one-shot molding plate 2, a two-shot molding plate 3, and a three-shot molding plate 4. The fixed plate 1 may be provided with a first exhaust hole 6 and a second exhaust hole 7. The first exhaust hole 6 and the second exhaust hole 7 may be vertically communicated with each other. The first exhaust hole 6 may communicate the inside of the fixed plate 1 with the first surface. The second exhaust hole 7 may communicate the inside and the side surface of the fixed plate 1. The fixing plate 1 may be a plate for fixing the first injection-molded plate 2, the second injection-molded plate 3, and the third injection-molded plate 4. The first vent hole 6 and the second vent hole 7 may be used to exhaust gas in the mold. The size of the hole diameters of the first exhaust hole 6 and the second exhaust hole 7 is not limited.

In some embodiments, the injection-molded plate 2 may be located on the second surface of the fixing plate 1. The injection molding plate 2 may be provided with an injection nozzle 8, an injection cavity 9, an injection runner 10 and an injection boss 11. The nozzle 8 may be provided on a side surface of the injection plate 2. The one injection cavity 9 may be provided on a first surface of the one injection-molded plate 2. The injection passage 10 may communicate the injection nozzle 8 and the injection cavity 9. The first injection boss 11 may be provided therein with a second injection inner diameter molding hole 12. The injection boss 11 may be provided at the center of the second surface of the injection-molded plate 2. The two-shot inner diameter molding hole 12 can vertically penetrate through the one-shot boss 11 and the one-shot molding plate 2 and is communicated with the one-shot cavity 9. The injection molding plate 2 may be a plate for molding the first layer of silicone rubber into a predetermined shape. The nozzle 8 may be a nozzle for injecting the glue into the mold. The injection cavity 9 may be a cavity for storing the first layer of silica gel. The injection passage 10 may be a passage for supplying the silicone rubber to the injection cavity 9. The injection boss 1 may be a boss for assisting the second layer of silicone rubber to be molded into a predetermined shape. In an operating state, the silicone rubber flowed in from the nozzle 8 can flow into the injection cavity 9 through the injection passage 10. The silica gel flowing into the one-shot cavity 9 is extruded from a one-shot boss 11 through a gap between the two-shot inner diameter molding hole 12 and the insert pin 5. A first layer of size can thus be produced.

In some embodiments, the two injection-molded plates 3 may be located on the second surface of the one injection-molded plate 2. The two-shot molding plate 3 may be provided with a two-shot cavity 13, a three-shot cavity 14, and a two-shot outer diameter molding hole 15. The two-shot cavity 13 may be provided on a first surface of the two-shot plate 3. The three-shot cavity 14 may be provided on a second surface of the two-shot plate 3. The two-shot outer diameter molding hole 15 may be provided at the center of the two-shot molding plate 3 and vertically penetrate the two-shot molding plate 3. The two-shot outer diameter molding hole 15 communicates the two-shot cavity 13 and the three-shot cavity 14. The first injection boss 11 may be inserted into the second injection outer diameter molding hole 15. The two-shot molding plate 3 may be a plate for molding the second layer of silicone rubber into a predetermined shape. The two-shot cavity 13 may be a cavity for storing a second layer of silica gel. The three-shot cavity 14 may be a cavity for storing a third layer of silicone rubber. In an operating state, the silicone rubber in the two-shot cavity 13 is extruded from the two-shot outer diameter molding hole 15 through a gap between the two-shot outer diameter molding hole 15 and the one-shot boss 11. A second layer of size can thus be produced.

In some embodiments, the three-shot plate 4 may be located on the second side of the two-shot plate 3. The three-shot formed plate 4 may include three-shot formed holes 16. The three-shot hole 16 may be formed at the center of the three-shot plate 4 and vertically penetrate the three-shot plate 4. The three-shot molding plate 4 may be a plate for molding the third layer of silicone rubber into a predetermined shape. In an operating state, the silicone rubber in the three-shot cavity 14 can be extruded from the three-shot molding hole 16 through the gap between the three-shot molding hole 16 and the second layer of rubber material, so that a third layer of rubber material can be prepared.

In some embodiments, the fixing plate 1 and the injection molding plate 2 may be provided with two fluid channel holes. The two-jet channel holes arranged on the fixing plate 1 can be respectively communicated with the two-jet channel holes arranged on the one-shot forming plate 2. The two jet flow passage holes arranged on the one injection molding plate 2 can be respectively communicated with the two injection cavities 13. The two-jet channel hole may be a channel hole for delivering the silica gel to the two-jet cavity 13. In a working state, the silica gel flowing in through the two-fluid channel holes formed in the fixing plate 1 may flow into the two-fluid cavity 13 through the two-fluid channel holes formed in the one-injection molding plate 2.

In some embodiments, the first injection-molded plate 2 and the second injection-molded plate 3 may be provided with two three-fluid channel holes. The two three-jet-flow-channel holes arranged on the first injection molding plate 2 can be respectively communicated with the two three-jet-flow-channel holes arranged on the second injection molding plate 3. The two three-jet flow passage holes arranged on the injection molding plate 2 can be respectively communicated with the injection cavity 9. The two three-jet flow passage holes arranged on the two-jet molding plate 3 can be respectively communicated with the three-jet cavity 14. In a working state, the silica gel flowing into the first injection cavity 9 can flow into the third injection cavity 14 through the two third jet channel holes formed in the first injection molding plate 2 and the two third jet channel holes formed in the second injection molding plate 3.

In some embodiments, the centers of the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4, and the fixing plate 1 may be provided with a pin hole. The insert pin holes provided in the first injection molding plate 2, the second injection molding plate 3, and the third injection molding plate 4 and the insert pin holes provided in the fixing plate 1 may communicate with each other. The insert pin hole provided in the fixed plate 1 may communicate the first exhaust hole 6 and the second exhaust hole 7. The pin inserting holes can be holes for placing pins.

In some embodiments, the insert pins 5 may be disposed in the insert pin holes. The insert pin 5 may be provided with an air intake hole 17 therein. The air intake holes 17 may vertically penetrate the insert pins 5. The insert pin 5 may be a circular core for assisting the silica gel to be molded into a predetermined shape.

In fig. 1, the first surface of the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4, and the fixing plate 1 is a surface below the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4, and the fixing plate 1. And the second surface of the one injection-molded plate 2, the two injection-molded plate 3, the three injection-molded plate 4, and the fixed plate 1 is a surface above the one injection-molded plate 2, the two injection-molded plate 3, the three injection-molded plate 4, and the fixed plate 1.

Alternatively, the center line of the first exhaust hole 6 and the center line of the second exhaust hole 7 may be perpendicular to each other. The size of the first exhaust hole 6 may be larger than the size of the second exhaust hole 7. The first exhaust hole 6 may have a larger diameter than the second exhaust hole 7. A person skilled in the art can adjust the aperture of the first exhaust hole 6 and the aperture of the second exhaust hole 7 according to actual conditions. Such variations are not beyond the scope of the present disclosure.

Alternatively, the angle between the horizontal vertical bisector of the injection passage 10 and the horizontal vertical bisector of the injection cavity 9 may be 30 °. It should be noted that, a person skilled in the art can adjust the included angle between the horizontal and vertical bisector of the injection channel 10 and the horizontal and vertical bisector of the injection cavity 9 according to practical situations. Such variations are not beyond the scope of the present disclosure.

Alternatively, the shape of the injection boss 11 may be an inverted funnel shape. The shape of the one-shot boss 11 may be an inverted horn shape.

Optionally, the three-shot forming plate 4 may further include a clearance groove 18, wherein the clearance groove 18 may be disposed in the center of the second surface of the three-shot forming plate 4.

Alternatively, a central connecting line of the two jet flow channel holes formed in the first injection molding plate 2 and a central connecting line of the two three jet flow channel holes formed in the first injection molding plate 2 may be perpendicular to each other. It should be noted that, a person skilled in the art can adjust an included angle between a central connecting line of the two-jet flow channel holes formed in the first injection molding plate 2 and a central connecting line of the two three-jet flow channel holes formed in the first injection molding plate 2 according to actual conditions. Such variations are not beyond the scope of the present disclosure.

Alternatively, the same corners of the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4 and the fixing plate 1 may be provided with chamfers having the same size, and when the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4 and the fixing plate 1 are coupled, the chamfers provided on the first injection-molded plate 2, the second injection-molded plate 3 and the third injection-molded plate 4 and the chamfers provided on the fixing plate 1 may be flush with each other. The degree of the chamfer provided can be adjusted by those skilled in the art according to the actual situation. The first injection molding plate 2, the second injection molding plate 3, the third injection molding plate 4 and the fixing plate 1 are combined with the set chamfer as a reference angle, so that the first injection molding plate 2, the second injection molding plate 3, the third injection molding plate 4 and the fixing plate 1 can be prevented from being reversely assembled.

Alternatively, the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4, and the fixing plate 1 may be provided with four mounting holes. The mounting holes provided in the first injection-molded plate 2, the second injection-molded plate 3, and the third injection-molded plate 4 may communicate with the mounting holes provided in the fixing plate 1, respectively. It is understood that the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4, and the fixing plate 1 may be provided with first, second, third, and fourth mounting holes. The four first mounting holes may be provided with centers on a central vertical line. The four second mounting holes may be provided with centers on a central vertical line. The four third mounting holes may be provided with centers on a central vertical line. The four fourth mounting holes may be provided with centers on a central vertical line. The mounting hole may be a cylindrical hole or a conical hole. The type, position and number of the mounting holes are not limited.

Alternatively, the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4, and the fixing plate 1 may be provided with two positioning pin holes. The positioning pin holes provided in the first injection-molded plate 2, the second injection-molded plate 3, and the third injection-molded plate 4 may be respectively communicated with the positioning pin holes provided in the fixing plate 1. It is understood that the first injection-molded plate 2, the second injection-molded plate 3, the third injection-molded plate 4, and the fixing plate 1 may be provided with first and second positioning pin holes. The four first positioning pin holes may be provided with centers on a central vertical line. The four second registration pin holes may be disposed on a central vertical line. The positioning pin hole may be a conical pin hole or a cylindrical pin hole. The type, position and number of the positioning pin holes are not limited.

The above embodiments of the present disclosure have the following beneficial effects: articles having three layers of compound may be made at a time by the tri-color extrusion die of some embodiments of the present disclosure. In particular, the reason why it is not possible to produce an article with three layers of gum at a time is that: the number of the flow channel holes and the number of the corresponding cavities are not enough, so that three layers of silica gel can not flow into the mold at one time. Based on this, some embodiments of the present disclosure provide a three-color extrusion die including a forming plate, a fixing plate, and an insert pin. The molding plate comprises a first injection molding plate, a second injection molding plate and a third injection molding plate. The injection molding plate is provided with an injection nozzle, an injection cavity, an injection flow channel and an injection boss. The first injection boss is internally provided with a second injection inner diameter forming hole. The two-shot molding plate is provided with a two-shot cavity, a three-shot cavity and a two-shot outer diameter molding hole. The three-shot molding plate comprises three-shot molding holes. The fixed plate and the injection molding plate are both provided with two jet flow channel holes. The first injection molding plate and the second injection molding plate are both provided with two three-jet flow channel holes. The centers of the first injection molding plate, the second injection molding plate, the third injection molding plate and the fixing plate are all provided with pin embedding holes. The insert pin is arranged in the insert pin hole. And because the enough number of flow passage holes and corresponding cavities are arranged, three layers of silica gel can be flowed in at one time. Therefore, the first layer of sizing material can be prepared through the gap between the two-shot inner diameter molding hole and the insert pin. And a second layer of sizing material can be prepared through the gap between the two-shot outer diameter forming hole and the one-shot boss. And a third layer of sizing material can be prepared through the gap between the three injection molding holes and the second layer of sizing material. Thus, an article with three layers of sizing materials is prepared at one time.

The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure in the embodiments of the present disclosure is not limited to the particular combination of the above-described features, but also encompasses other embodiments in which any combination of the above-described features or their equivalents is possible without departing from the scope of the present disclosure. For example, the above features and (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure are mutually replaced to form the technical solution.

Claims (9)

1. A three-color extrusion die is characterized by comprising a forming plate, a fixing plate and an insert pin, wherein the forming plate comprises a first injection forming plate, a second injection forming plate and a third injection forming plate,

the fixing plate is provided with a first exhaust hole and a second exhaust hole, wherein the first exhaust hole and the second exhaust hole are vertically communicated with each other, the first exhaust hole is communicated with the inside and the first surface of the fixing plate, and the second exhaust hole is communicated with the inside and the side surface of the fixing plate;

the injection molding plate is positioned on the second surface of the fixing plate, the injection molding plate is provided with an injection nozzle, an injection cavity, an injection flow channel and an injection boss, wherein the injection nozzle is arranged on the side surface of the injection molding plate, the injection cavity is arranged on the first surface of the injection molding plate, the injection flow channel is communicated with the injection nozzle and the injection cavity, the injection boss is internally provided with two injection inner diameter molding holes, the injection boss is arranged in the center of the second surface of the injection molding plate, and the two injection inner diameter molding holes vertically penetrate through the injection boss and the injection molding plate and are communicated with the injection cavity;

the two-injection molding plate is positioned on the second surface of the one-injection molding plate, a two-injection cavity, a three-injection cavity and a two-injection outer diameter molding hole are formed in the two-injection molding plate, the two-injection cavity is arranged on the first surface of the two-injection molding plate, the three-injection cavity is arranged on the second surface of the two-injection molding plate, the two-injection outer diameter molding hole is arranged in the center of the two-injection molding plate and vertically penetrates through the two-injection molding plate, the two-injection outer diameter molding hole is communicated with the two-injection cavity and the three-injection cavity, and the one-injection boss is inserted into the two-injection outer diameter molding hole;

the three-injection molding plate is positioned on the second surface of the two-injection molding plate and comprises a three-injection molding hole, and the three-injection molding hole is arranged in the center of the three-injection molding plate and vertically penetrates through the three-injection molding plate;

the fixed plate and the first injection molding plate are both provided with two-jet-flow-channel holes, the two-jet-flow-channel holes arranged on the fixed plate are respectively communicated with the two-jet-flow-channel holes arranged on the first injection molding plate, and the two-jet-flow-channel holes arranged on the first injection molding plate are respectively communicated with the two-jet mold cavity;

the first injection molding plate and the second injection molding plate are both provided with two three-jet flow channel holes, the two three-jet flow channel holes arranged on the first injection molding plate are respectively communicated with the two three-jet flow channel holes arranged on the second injection molding plate, the two three-jet flow channel holes arranged on the first injection molding plate are respectively communicated with the first injection cavity, and the two three-jet flow channel holes arranged on the second injection molding plate are respectively communicated with the third injection cavity;

the centers of the first injection molding plate, the second injection molding plate, the third injection molding plate and the fixing plate are all provided with pin embedding holes, the pin embedding holes arranged on the first injection molding plate, the second injection molding plate and the third injection molding plate are communicated with the pin embedding holes arranged on the fixing plate, and the pin embedding holes arranged on the fixing plate are communicated with the first exhaust hole and the second exhaust hole;

the insert pin is arranged in the insert pin hole, an air inlet hole is formed in the insert pin, and the air inlet hole vertically penetrates through the insert pin.

2. The three-color extrusion die of claim 1, wherein the centerline of the first vent is perpendicular to the centerline of the second vent, the first vent being larger in size than the second vent.

3. The three-color extrusion die of claim 1, wherein the included angle between the horizontal vertical bisector of the one-shot channel and the horizontal vertical bisector of the one-shot cavity is 30 °.

4. The three-color extrusion die of claim 1, wherein the one-shot boss is shaped as an inverted funnel.

5. The three-color extrusion die of claim 1, wherein the three-shot forming plate further comprises a clearance groove, wherein the clearance groove is centrally disposed on the second face of the three-shot forming plate.

6. The three-color extrusion die of claim 1, wherein a central connecting line of the two-jet channel holes formed in the one injection-molding plate is perpendicular to a central connecting line of the two three-jet channel holes formed in the one injection-molding plate.

7. The three-color extrusion die as claimed in claim 1, wherein the same corners of the first injection plate, the second injection plate, the third injection plate and the fixing plate are provided with chamfers having the same size, and when the first injection plate, the second injection plate, the third injection plate and the fixing plate are connected, the chamfers provided on the first injection plate, the second injection plate and the third injection plate are in the same plane as the chamfers provided on the fixing plate.

8. The three-color extrusion die of claim 1, wherein the first injection plate, the second injection plate, the third injection plate and the fixing plate are each provided with four mounting holes, and the mounting holes provided in the first injection plate, the second injection plate and the third injection plate are respectively communicated with the mounting holes provided in the fixing plate.

9. The three-color extrusion die of claim 1, wherein the first injection plate, the second injection plate, the third injection plate and the fixing plate are provided with two positioning pin holes, and the positioning pin holes provided in the first injection plate, the second injection plate and the third injection plate are respectively communicated with the positioning pin holes provided in the fixing plate.

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