CN219213888U - Double-layer injection molding device - Google Patents

Abstract

The utility model provides a double-layer injection molding device, which comprises a rotating shaft; a first mold core; the first die core and the second die core are fixed on two opposite sides of the rotating shaft in the circumferential direction; the injection molding machine comprises a fixed die and a movable die, wherein the first die core and the second die core are positioned between the fixed die and the movable die, and the movable die is provided with a first feeding nozzle and a second feeding nozzle which are arranged along the axial direction perpendicular to the rotating shaft; the driving mechanism is used for driving the rotating shaft to rotate around the axis of the rotating shaft so as to drive the first die core and the second die core to rotate and sequentially and alternately align the first feeding nozzle or the second feeding nozzle to form a first layer of plastic or a second layer of plastic. Aims at solving the problem of low production efficiency of double-layer injection molding products.

Description

Double-layer injection molding device

Technical Field

The utility model relates to the technical field of product injection molding equipment, in particular to a double-layer injection molding device.

Background

Many packaging products require two materials for double injection molding, heretofore such products have been produced by only two processes: (1) the first injection molding machine is used for injecting hard rubber firstly, and after injection molding is completed, the semi-finished product is taken out and put into the second injection molding machine for injecting soft rubber. The process occupies more machines, the CT of the product is long, the manpower is wasted, the product is poor easily in the transfer process, the production yield is low, the reworking cannot be realized, a large amount of raw materials are wasted, and the production cost is high. (2) And (3) using an injection molding machine with a turntable, rotating the movable mold by 180 degrees through the turntable after hard glue is injected on one side of the mold, and injecting soft glue on the other side of the mold. The process has high requirements on the injection molding machine, the injection molding machine is required to be provided with a turntable, and the vibration is large when the mold rotates, so that the yield of injection molding products is affected.

Disclosure of Invention

Accordingly, the present utility model is directed to a dual-layer injection molding device, which is designed to solve the problem of low production efficiency of dual-layer injection molding products.

The present utility model provides a double-layer injection molding apparatus comprising:

a rotation shaft;

a first mold core;

the first die core and the second die core are fixed on two opposite sides of the rotating shaft in the circumferential direction;

the injection molding machine comprises a fixed die and a movable die, wherein the first die core and the second die core are positioned between the fixed die and the movable die, and the movable die is provided with a first feeding nozzle and a second feeding nozzle which are arranged along the axial direction perpendicular to the rotating shaft;

the driving mechanism is used for driving the rotating shaft to rotate around the axis of the rotating shaft so as to drive the first die core and the second die core to rotate and sequentially and alternately align the first feeding nozzle or the second feeding nozzle to form a first layer of plastic or a second layer of plastic.

In one embodiment, the injection molding machine further comprises a first demolding mechanism for removing the injection molded product, wherein the first demolding mechanism is arranged along the periphery of the first mold core.

In one embodiment, the first demolding mechanism has a first through hole for nesting the first mold insert, and the first through hole is in clearance fit with the first mold insert.

In one embodiment, the injection molding machine further comprises a second demolding mechanism for removing the injection molded product, wherein the second demolding mechanism is arranged along the periphery of the second mold core.

In one embodiment, the second demolding mechanism has a second through hole for nesting the second mold insert, and the second through hole is in clearance fit with the second mold insert.

In an embodiment, the first demolding mechanism and the second demolding mechanism are movable in a direction away from the rotation axis.

In an embodiment, the number of the first mold cores is plural, and the plural first mold cores are disposed along the axial direction of the rotating shaft; the number of the second mold cores is multiple, and the multiple second mold cores are arranged along the axial direction of the rotating shaft.

In one embodiment, the first mold core and the second mold core form an included angle of 180 °.

In an embodiment, the mold further comprises a first sensing mechanism for identifying that the first mold core is aligned with the first feeding nozzle and a second sensing mechanism for identifying that the second mold core is aligned with the second feeding nozzle, wherein the first sensing mechanism and the second sensing mechanism are arranged on two opposite sides of the rotating shaft, and a connecting line of the first sensing mechanism and the second sensing mechanism is parallel to a connecting line of the first feeding nozzle and the second feeding nozzle.

In an embodiment, the device further comprises a blocking piece arranged on the rotating shaft, and the blocking piece rotates along with the rotating shaft to be identified by the first sensing mechanism or the second sensing mechanism.

According to the double-layer injection molding device, the first die core and the second die core are arranged along the circumferential direction of the rotating shaft, and one end of the first die core and one end of the second die core are fixed on the rotating shaft, so that the first die core and the second die core rotate along with the rotating shaft to be alternately positioned at different positions. The movable mould and the fixed mould of the injection moulding machine are provided with a first injection moulding cavity for injecting a first layer of plastic and a second injection moulding cavity for injecting a second layer of plastic after being clamped, the fixed mould is provided with a first feeding nozzle positioned in the first injection moulding cavity and a second feeding nozzle positioned in the second injection moulding cavity, the first mould core and the second mould core alternately fall into the first injection moulding cavity or the second injection moulding cavity along with rotation of the rotating shaft, and the first feeding nozzle and the second feeding nozzle sequentially feed to the first mould core or the second mould core. Specifically, a first feeding nozzle in a first injection cavity feeds a first mold core to form a first layer of plastic, and the first mold core carries the first layer of plastic and a second mold core to rotate along with a rotating shaft. At the moment, the first mold core and the first layer of plastic are positioned in the second injection cavity, the second feeding nozzle feeds the first mold core on the basis of the first layer of plastic to form a second layer of plastic, and a product after the second layer of plastic is molded can be demolded; the second die core is positioned in the first injection cavity, and the first feeding nozzle feeds the second die core to form a first layer of plastic; the second mould core carries first layer plastic and the first mould core after the product drawing of patterns rotates along with the rotation axis jointly, and second mould core and first layer plastic are located the second and mould plastics the intracavity this moment, and first mould core is located first intracavity of moulding plastics to this circulation guarantees that first mould core and second mould core keep continuous operating condition, and the compound die of movable mould and cover half can form first layer plastic or second layer plastic on first mould core and second mould core simultaneously, reduces equipment input, improves production efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic plan view showing a double-layer injection molding apparatus according to an embodiment of the present utility model.

Fig. 2 is a schematic perspective view of the dual-layer injection molding apparatus of fig. 1 without an injection molding machine.

FIG. 3 is a front view of the dual layer injection molding apparatus of FIG. 1 without an injection molding machine.

Reference numerals illustrate: 10. a rotation shaft; 20. a first mold core; 30. a second mold core; 40. an injection molding machine; 41. a movable mold; 42. a fixed mold; 421. a first feed nozzle; 422. a second feed nozzle; 50. a driving mechanism; 60. a first demolding mechanism; 61. a power mechanism; 70. a second demolding mechanism; 80. a first sensing mechanism; 90. a second sensing mechanism; 91. a baffle.

Detailed Description

Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.

The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the inventive product is conventionally disposed in use, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore are not to be construed as limiting the utility model.

The terms "first," "second," "third," and the like, are merely used for distinguishing between similar elements and not necessarily for indicating or implying a relative importance or order.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements does not include only those elements but may include other elements not expressly listed.

One embodiment of the present utility model provides a two-layer injection molding apparatus comprising:

a rotation shaft 10;

a first mold core 20;

the second mold core 30, the first mold core 20 and the second mold core 30 are fixed at opposite sides of the rotation shaft 10 in the circumferential direction;

the injection molding machine 40 includes a movable mold 41 and a fixed mold 42, the first mold core 20 and the second mold core 30 are located between the movable mold 41 and the fixed mold 42, the fixed mold 42 has a first feeding nozzle 421 and a second feeding nozzle 422 arranged along an axial direction perpendicular to the rotation axis 10 to form a first layer of plastic or a second layer of plastic; after the movable die 41 and the fixed die 42 are clamped, a first injection cavity and a second injection cavity are formed, a first feeding nozzle 421 is positioned in the first injection cavity, and a second feeding nozzle 422 is positioned in the second injection cavity;

the driving mechanism 50 is used for driving the rotation shaft 10 to rotate around the axis of the rotation shaft 10 so as to drive the first mold core 20 and the second mold core 30 to rotate and sequentially and alternately align with the first feeding nozzle 421 or the second feeding nozzle 422, so as to form a first layer of plastic or a second layer of plastic. When the first mold core 20 or the second mold core 30 rotates along with the rotating shaft 10 to fall into the first injection cavity, the first feeding nozzle 421 feeds the first mold core 20 or the second mold core 30 to form a first layer of plastic; when the first mold 20 carrying the first layer of plastic or the second mold 30 carrying the first layer of plastic rotates along with the rotating shaft 10 to fall into the second injection cavity, the second feeding nozzle 422 feeds the first mold 20 or the second mold 30 to form the second layer of plastic.

Specifically, the first mold core 20 and the second mold core 30 are installed on the rotating shaft 10 along the axial direction of the rotating shaft 10, and alternately fall into a first injection cavity and a second injection cavity of the injection molding machine 40 along with the rotation of the rotating shaft 10, wherein the first injection cavity is used for injecting a first layer of plastic, the second injection cavity is used for injecting a second layer of plastic, the first layer of plastic and the second layer of plastic are generally formed by different injection molding materials, for example, the first layer of plastic is hard rubber, the second layer of plastic is soft rubber, and of course, the first layer of plastic or the second layer of plastic can also be formed by injection molding materials of other materials under the condition of considering actual requirements, which is not limited herein. The first mold core 20, the second mold core 30 and the rotating shaft 10 are arranged between the movable mold 41 and the fixed mold 42, so that the first mold core 20 and the second mold core 30 can fall into the first injection cavity or the second injection cavity when the movable mold 41 and the fixed mold 42 are assembled. The rotary shaft 10 drives the first die core 20 and the second die core 30 to be alternately aligned with the first feeding nozzle 421 or the second feeding nozzle 422, when the first die core 20 or the second die core 30 is aligned with the first feeding nozzle 421, the first feeding nozzle 421 feeds the first die core 20 or the second die core 30, and the fixed die 42 and the movable die 41 are clamped to form a first layer of plastic; the first mold core 20 or the second mold core 30 is aligned with the second feeding nozzle 422 on the basis of the formation of the first layer of plastic, the second feeding nozzle 422 feeds the first layer of plastic on the first mold core 20 or the second mold core 30, the fixed mold 42 and the movable mold 41 are clamped again to form a second layer of plastic, and after the first layer of plastic and the second layer of plastic are completed, the product is demolded from the first mold core 20 or the second mold core 30. The first layer of plastic is alternately formed on the first mold core 20 and the second mold core 30, and injection molding of the second layer of plastic can be performed on the basis of the first layer of plastic formed on the first mold core 20 or the second mold core 30, otherwise, when the first mold core 20 or the second mold core 30 is aligned with the second feeding nozzle 422, the feeding of the second feeding nozzle 422 is suspended. The first die core 20 and the second die core 30 rotate together with the rotating shaft 10, but work independently and are not mutually interfered, so that the production efficiency is improved, and the standby time of equipment is reduced; the rotation stroke of the rotation shaft 10 is stable, the movement amplitude is small, and the vibration generated by rotation is avoided to influence the product yield.

In this embodiment, the injection molding machine includes a first demolding mechanism 60 for removing the injection molded product, the first demolding mechanism 60 includes a first demolding mechanism 60, the first demolding mechanism 60 is disposed along the peripheral edge of the first mold core 20, and the first demolding mechanism 60 is driven to move along the direction of the first mold core 20 away from or close to the rotation axis 10.

Specifically, after the first layer of plastic and the second layer of plastic are all formed on the first mold core 20, the product is ejected from the first mold core 20 through the first ejection mechanism 60. The first demolding mechanism 60 is arranged along the circumferential direction of the first mold core 20, and the first demolding mechanism 60 is usually arranged at one end of the first mold core 20 close to the rotating shaft 10 before the second layer of plastic of the product is subjected to injection molding; after the second layer of plastic is formed, the first demolding mechanism 60 is driven by the power mechanism 61 to push out the product from one end of the first mold core 20 close to the rotating shaft 10 along the direction that the first mold core 20 deviates from the rotating shaft 10 until the product is separated from the first mold core 20. Avoiding the limitation of manual material taking, reducing product pollution and improving production efficiency.

In this embodiment, the first demolding mechanism 60 has a first through hole for sleeving the first mold core 20, and the first through hole is in clearance fit with the first mold core 20.

Specifically, the first demolding mechanism 60 is provided with a first through hole, and the product on the first mold core 20 is ejected through the peripheral edge of the first through hole, so that the stress of the product is more uniform, and damage to the product during ejection is avoided.

In other embodiments, the number of the first demolding mechanisms 60 is plural, and the plurality of first demolding mechanisms 60 are disposed at intervals along the circumferential direction of the first mold core 20.

In this embodiment, the second demolding mechanism 70 for removing the injection molded product is included, the second demolding mechanism 70 includes the second demolding mechanism 70, the second demolding mechanism 70 is disposed along the peripheral edge of the second mold core 30, and the second demolding mechanism 70 is driven to move along the direction of the second mold core 30 away from or close to the rotation shaft 10.

In this embodiment, the second demolding mechanism 70 has a second through hole for sleeving the second mold insert 30, and the second through hole is in clearance fit with the second mold insert 30.

In this embodiment, the double-shot molding apparatus further includes a power mechanism 61 for driving the first mold release mechanism 60 or the second mold release mechanism 70 to move in a direction away from the rotation shaft 10.

Specifically, the second demolding mechanism 70 is disposed at one end of the second mold core 30 near the rotation shaft 10, the power mechanism 61 includes two cylinders, and the two cylinders can be disposed at two ends of the rotation shaft 10 in the axial direction, so as to improve the balance of the double-layer injection molding device, and make the double-layer injection molding device operate more stably. Further, when the rotation shaft 10 drives the first demoulding mechanism 60 or the second demoulding mechanism 70 to rotate into the first injection cavity, that is, the first demoulding mechanism 60 or the second demoulding mechanism 70 faces upwards, the two cylinders eject the first demoulding mechanism 60 or the second demoulding mechanism 70 and take out injection molding finished products.

In the present embodiment, the number of the first mold cores 20 is plural, and the plural first mold cores 20 are disposed along the axial direction of the rotating shaft 10; the number of the second mold cores 30 is plural, and the plural second mold cores 30 are disposed along the axial direction of the rotating shaft 10.

Specifically, the number of the first through holes of the first demolding mechanism 60 is set corresponding to the number of the first mold cores 20; the number of the second through holes of the second demolding mechanism 70 is set corresponding to the number of the second mold cores 30.

In this embodiment, the first mold core 20 and the second mold core 30 form an included angle of 180 °.

Specifically, the first mold core 20 and the second mold core 30 form an included angle of 180 degrees, so that the structures of the fixed mold 42 and the movable mold 41 can be relatively simple, the local thicknesses of the fixed mold 42 and the movable mold 41 or the inclination angles thereof do not need to be changed to adapt to the first mold core 20 and the second mold core 30, the structural complexity of the double-layer injection molding device can be reduced, and the blocking of the rotation of the first mold core 20 and the second mold core 30 caused by the excessively complex structure of the injection molding machine 40 is avoided.

In other embodiments, the first and second mold cores 20 and 30 may form an included angle of (0 °,180 °) as the structure of the fixed and movable molds 42 and 41 allows.

In this embodiment, the first sensing mechanism 80 for identifying that the first mold core 20 is aligned with the first feeding nozzle 421 and the second sensing mechanism 90 for identifying that the second mold core 30 is aligned with the second feeding nozzle 422 are further included, the first sensing mechanism 80 and the second sensing mechanism 90 are disposed on two opposite sides of the rotating shaft 10, and the connecting line of the first sensing mechanism 80 and the second sensing mechanism 90 is parallel to the connecting line of the first feeding nozzle 421 and the second feeding nozzle 422, so as to ensure that the positions of the first sensing mechanism 80 and the second sensing mechanism 90 can accurately reflect the positions of the first mold core 20 and the second mold core 30.

In this embodiment, the stopper 91 provided on the rotation shaft 10 is further included, and the stopper 91 rotates with the rotation shaft 10 to be recognized by the first sensing mechanism 80 or the second sensing mechanism 90.

Specifically, the blocking piece 91 is located at one side of the rotating shaft 10 where the first mold core 20 or the second mold core 30 is located, and rotates together with the first mold core 20 or the second mold core 30 along with the rotating shaft 10, when the rotating radian of the first mold core 20 or the second mold core 30 is 2npi (n is an integer), the blocking piece 91 is identified by the first sensing mechanism 80; when the rotation radian of the first mold core 20 or the second mold core 30 is pi+2npi (n is an integer), the blocking member 91 is identified by the second sensing mechanism 90.

In the present embodiment, the injection molding machine 40 further includes a driving device for driving the fixed mold 42 to be clamped with the movable mold 41 and a robot for taking out the product.

In this embodiment, the double-sided injection molding apparatus further includes a computer for controlling the operation process, and the computer is electrically connected to the injection molding machine 40, the driving mechanism 50, the first sensing mechanism 80, the second sensing mechanism 90, the first demolding mechanism 60, and the second demolding mechanism 70, and is capable of receiving the operation signals of the injection molding machine 40, the driving mechanism 50, the first sensing mechanism 80, the second sensing mechanism 90, the first demolding mechanism 60, and the second demolding mechanism 70, and outputting the signals to the control system thereof.

The operation steps of the double-layer injection molding device for injecting soft and hard double-layer plastic products provided by the embodiment are as follows:

(1) After the double-layer injection molding device is installed and started, when the computer detects a mold opening in-place signal of the injection molding machine 40, an initialization button is clicked, and the computer system is initialized. At this time, the first demoulding mechanism 60 and the second demoulding mechanism 70 are driven to retract to the initial positions (the ends of the first mould core 20 and the second mould core 30 close to the rotating shaft 10).

(2) When the first demoulding mechanism 60 and the second demoulding mechanism 70 are detected to be retracted into position (and can be oil cylinders, the stroke of the oil cylinders can be detected to judge whether the first demoulding mechanism 60 and the second demoulding mechanism 70 are retracted into position, the driving mechanism 50 is provided with the rotating shaft 10, the first demoulding mechanism 60, the second demoulding mechanism 70, the first die core 20 and the second die core 30, the rotating radian is 2n pi, the first sensing mechanism 80 detects the blocking piece 91, and a signal is output to a control system of a computer.

(3) The control system allows the injection molding machine 40 to be clamped, and the injection molding machine 40 can be manually clicked to clamp the mold. After the mold is closed, the first feeding nozzle 421 of the injection molding machine 40 injects a hard rubber bottom shell onto the first mold core 20 (the second feeding nozzle 422 of the injection molding machine 40 does not work when the first injection molding is started).

(4) After the movable mold 41 and the fixed mold 42 are opened in place after the injection molding is completed, the driving mechanism 50 drives the rotating shaft 10, the first demolding mechanism 60, the second demolding mechanism 70, the first mold core 20 and the second mold core 30 to rotate in the radian of pi+2npi, and at this time, the second sensing mechanism 90 detects the blocking member 91 and outputs a signal to the control system.

(5) The control system allows the injection molding machine 40 to mold. After the mold is closed, the first feeding nozzle 421 of the injection molding machine 40 injects a hard rubber bottom shell onto the first mold core 20, and the second feeding nozzle 422 of the injection molding machine 40 injects a soft rubber sheath onto the hard rubber bottom shell of the first mold core 20.

(6) After the injection molding is completed and the injection mold is opened in place, the driving mechanism 50 drives the first demolding mechanism 60 and the second demolding mechanism 70 to eject, and the product attached to the first mold core 20 is ejected.

(7) The robot mounted on the injection molding machine 40 takes out the product ejected from the first mold core 20, and gives a material taking completion signal after the robot exits to the safe position. (this step is only exemplified by the robot reclaiming mode, and in other embodiments can be accomplished by manual mode as well)

(8) The driving mechanism 50 drives the first demoulding mechanism 60 and the second demoulding mechanism 70 to retract to the initial positions.

The above steps are sequentially circulated.

According to the double-layer injection molding device provided by the utility model, the first die core 20 and the second die core 30 are arranged along the circumferential direction of the rotary shaft 10, and one end of the double-layer injection molding device is fixed on the rotary shaft 10, so that the first die core 20 and the second die core 30 rotate along with the rotary shaft 10 to be alternately positioned at different positions. The fixed die 42 and the movable die 41 of the injection molding machine 40 are provided with a first injection molding cavity for injecting a first layer of plastic and a second injection molding cavity for injecting a second layer of plastic after being clamped, the movable die 41 is provided with a first feeding nozzle 421 positioned in the first injection molding cavity and a second feeding nozzle 422 positioned in the second injection molding cavity, the first die core 20 and the second die core 30 alternately fall into the first injection molding cavity or the second injection molding cavity along with the rotation of the rotating shaft 10, and the first feeding nozzle 421 and the second feeding nozzle 422 sequentially feed the first die core 20 or the second die core 30. Specifically, the first feeding nozzle 421 in the first injection cavity feeds the first mold core 20 to form a first layer of plastic, and the first mold core 20 carries the first layer of plastic and the second mold core 30 to rotate along with the rotation shaft 10. At this time, the first mold core 20 and the first layer of plastic are located in the second injection cavity, the second feeding nozzle 422 feeds the first mold core 20 on the basis of the first layer of plastic to form a second layer of plastic, and the second layer of plastic can be demolded after being molded; the second mold core 30 is located in the first injection cavity, and the first feeding nozzle 421 feeds the second mold core 30 to form a first layer of plastic; the second mould core 30 carries the first mould core 20 after the first layer plastic and the product are demolded and rotates together with the rotary shaft 10, at this time, the second mould core 30 and the first layer plastic are positioned in the second injection cavity, the first mould core 20 is positioned in the first injection cavity, and the circulation is performed, so that the first mould core 20 and the second mould core 30 are ensured to keep a continuous working state, and the first mould core 20 and the second mould core 30 can be simultaneously formed with the first layer plastic or the second layer plastic by one-time mould clamping of the fixed mould 42 and the movable mould 41, so that the equipment investment is reduced, and the production efficiency is improved.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.

Claims (10)

1. A dual layer injection molding apparatus, comprising:

a rotating shaft (10);

a first mold core (20);

the first die core (20) and the second die core (30) are fixed on two opposite sides of the rotating shaft (10) in the circumferential direction;

an injection molding machine (40) comprising a movable mold (41) and a fixed mold (42), wherein the first mold core (20) and the second mold core (30) are positioned between the movable mold (41) and the fixed mold (42), and the fixed mold (42) is provided with a first feeding nozzle (421) and a second feeding nozzle (422) which are arranged along the axial direction perpendicular to the rotating shaft (10);

the driving mechanism (50) is used for driving the rotating shaft (10) to rotate around the axis of the rotating shaft (10) so as to drive the first die core (20) and the second die core (30) to rotate and sequentially and alternately align the first feeding nozzle (421) or the second feeding nozzle (422) to form a first layer of plastic or a second layer of plastic.

2. The double-layer injection molding apparatus of claim 1, further comprising a first demolding mechanism (60) for ejecting an injection molded product, the first demolding mechanism (60) being disposed along a peripheral edge of the first mold core (20).

3. The double-layer injection molding apparatus according to claim 2, wherein the first demolding mechanism (60) has a first through hole for nesting the first mold core (20), the first through hole being in clearance fit with the first mold core (20).

4. The double-layer injection molding apparatus according to claim 2, further comprising a second demolding mechanism (70) for ejecting the injection molded product, the second demolding mechanism (70) being disposed along a peripheral edge of the second mold core (30).

5. The double-layer injection molding apparatus according to claim 4, wherein the second demolding mechanism (70) has a second through hole for nesting the second mold insert (30), the second through hole being in clearance fit with the second mold insert (30).

6. The double-layer injection molding apparatus according to claim 4, further comprising a power mechanism (61) for driving the first demolding mechanism (60) or the second demolding mechanism (70) to move in a direction away from the rotation axis (10).

7. The double-layer injection molding apparatus according to claim 1, wherein the number of the first mold cores (20) is plural, and the plural first mold cores (20) are disposed along the axial direction of the rotation shaft (10); the number of the second mold cores (30) is multiple, and the second mold cores (30) are arranged along the axial direction of the rotating shaft (10).

8. The double-layer injection molding apparatus according to claim 1, wherein the first mold core (20) and the second mold core (30) form an included angle of 180 °.

9. The double-layer injection molding apparatus according to claim 1, further comprising a first sensing mechanism (80) for identifying that the first mold core (20) is being aligned with the first nozzle (421) and a second sensing mechanism (90) for identifying that the second mold core (30) is being aligned with the second nozzle (422), wherein the first sensing mechanism (80) and the second sensing mechanism (90) are provided on opposite sides of the rotation shaft (10), and a line connecting the first sensing mechanism (80) and the second sensing mechanism (90) is parallel to a line connecting the first nozzle (421) and the second nozzle (422).

10. The double-layer injection molding apparatus according to claim 9, further comprising a stopper (91) provided to the rotary shaft (10), the stopper (91) being recognized by the first sensing mechanism (80) or the second sensing mechanism (90) as the rotary shaft (10) rotates.

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