CN215619742U - Ejection mechanism and injection mold - Google Patents

Abstract

The application discloses an ejection mechanism and an injection mold, wherein the ejection mechanism comprises a lower mold component and an ejection component, the lower mold component comprises an outer mold core and an inner mold core, the inner mold core comprises a fixing part and a product part protruding from the fixing part, the product part penetrates through and is exposed out of the outer mold core, the product part is used for molding an injection molding piece, the fixing part is used for abutting and limiting one side surface of the outer mold core, and the other side surface of the outer mold core can abut against a first end part of the injection molding piece; the ejection assembly comprises a push plate and a return needle, two ends of the return needle are respectively connected to the push plate and the outer mold core, and the push plate can push the outer mold core to move in a direction away from the fixing part so as to eject the injection molding piece. The outer mold core can support and hold the first end of the injection molding, when the pushing plate pushes the outer mold core to move towards the direction of the fixing part far away from the inner mold core, the outer mold core can integrally push the end of the injection molding to eject the injection molding from the product part of the inner mold core, the first end of the injection molding is uniformly stressed, and the deformation in the ejection process can be reduced.

Description

Ejection mechanism and injection mold

Technical Field

The application relates to the technical field of injection molding, in particular to an ejection mechanism and an injection mold.

Background

In the field of injection molding, ejection of injection molding parts is usually realized by adopting structures such as ejector pins and inclined ejectors, but for barrel-shaped injection molding parts with deep cavity depths, the ejector pins cannot be arranged due to structural or appearance requirement limitation, and the ejection of the inclined ejectors can cause uneven stress of the injection molding parts and cause deformation of the injection molding parts when being used alone.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the ejection mechanism is provided, so that the stress of the injection molding piece in the ejection process is uniform, and the deformation of the injection molding piece in the ejection process is reduced.

The application also provides an injection mold comprising the ejection mechanism.

The embodiment of the first aspect of this application provides an ejection mechanism for ejecting injection molding includes: the lower die assembly comprises an outer die core and an inner die core, the inner die core comprises a fixing part and a product part protruding from the fixing part, the product part penetrates through and is exposed out of the outer die core, the product part is used for forming the injection molding piece, the fixing part is used for being abutted and limited with one side surface of the outer die core, and the other side surface of the outer die core can be abutted to a first end part of the injection molding piece; and the ejection assembly comprises a push plate and a return needle, two ends of the return needle are respectively connected to the push plate and the outer mold core, and the push plate can push the outer mold core to move towards the direction far away from the fixed part so as to eject the injection molding piece.

The ejection mechanism provided by the embodiment of the first aspect of the application has at least the following beneficial effects: the outer mold core can support and hold the first end of the injection molding, when the pushing plate pushes the outer mold core to move towards the direction of the fixing part far away from the inner mold core, the outer mold core can integrally push the end of the injection molding to eject the injection molding from the product part of the inner mold core, the first end of the injection molding is uniformly stressed, and the deformation in the ejection process can be reduced.

In some embodiments of this application, the ejecting subassembly still includes oblique ejector pin, oblique ejector pin penetrate in interior mold core, oblique ejector pin is relative the moving direction slope of outer mold core, oblique ejector pin has ejecting end and catch end, ejecting end with the inside butt of the second tip of injection molding, the catch end connect in the catch plate, oblique ejector pin can by the catch plate promotes and moves in order to ejecting along its length direction injection molding.

In some embodiments of the present application, the inner mold core is provided with a slanted ejecting guide hole inclined with respect to the moving direction of the outer mold core, the ejecting end passes through the slanted ejecting guide hole and abuts against the inside of the second end portion, and the slanted ejecting guide hole guides the moving direction of the slanted ejecting rod.

In some embodiments of this application, ejecting subassembly still includes oblique footstock, the one end of oblique footstock with the promotion end sliding connection of oblique ejector pin, the other end of oblique footstock connect in the slurcam, oblique footstock with be on a parallel with the moving direction setting of outer mold core can be followed the length direction of oblique footstock removes.

In some embodiments of this application, lower mould component still includes backing plate and oblique footstock guide, the interior mold core is fixed in the backing plate, oblique footstock guide part is located the backing plate is kept away from one side of outer mold core, oblique footstock guide is provided with oblique footstock guiding hole, oblique footstock wears to locate oblique footstock guiding hole, oblique footstock guiding hole is used for right oblique footstock leads.

In some embodiments of the present application, the backing plate is provided with an oblique top pushing hole, a part of the oblique top rod is accommodated in the oblique top pushing hole, and a cross section of the oblique top rod perpendicular to a length direction of the oblique top rod is smaller than a cross section of the oblique top pushing hole perpendicular to an axis of the oblique top pushing hole.

In some embodiments of the present application, the slanted ejecting seat guide portion and the pad plate are of a separate structure.

In some embodiments of the present application, the lower die assembly further includes an ejector plate and a backing plate, the outer die core is embedded in a side of the ejector plate away from the inner die core, and the ejector plate limits movement of the outer die core towards the inner die core; the inner mold core is fixed on the base plate, the base plate is provided with a back needle guide hole, the back needle penetrates through the back needle guide hole, and two ends of the back needle are respectively connected with the push plate and the ejector plate.

In some embodiments of the present application, the ejection assembly further includes a support for supporting the inner core, and the push plate is capable of reciprocating in a direction of a supporting force of the support to the inner core.

The embodiment of the second aspect of the present application provides an injection mold, including: the ejection mechanism provided in any of the embodiments above; go up the mould subassembly, go up the mould subassembly with the lower mould subassembly sets up relatively, go up the mould subassembly with the die cavity can be injectd to the lower mould subassembly, the die cavity is used for the injection moulding of injection molding.

The ejection mechanism provided by the embodiment of the second aspect of the application has at least the following beneficial effects: the ejection mechanism capable of enabling the injection molding piece to be evenly stressed in the ejection process is adopted, so that the deformation of the injection molding piece can be reduced, the generation of defective products is reduced, the yield is improved, and the production efficiency is improved.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a schematic perspective view of an ejection mechanism according to some embodiments provided in the first aspect of the present application;

FIG. 2 is an exploded view of the ejection mechanism shown in FIG. 1;

FIG. 3 is a top view of the ejection mechanism shown in FIG. 1;

FIG. 4 is a cross-sectional view A-A of the ejection mechanism shown in FIG. 3, taken across the plane of the ejection mechanism before ejection;

FIG. 5 is a cross-sectional view A-A of the ejection mechanism shown in FIG. 3 after ejection;

fig. 6 is a sectional view of the inner core of the ejection mechanism shown in fig. 1.

Reference numerals:

the mold comprises a lower mold component 100, an outer mold core 110, an inner mold core 120, a fixing part 121, a product part 122, an inclined top guide hole 123, a backing plate 130, an inclined top pushing hole 131, a needle returning guide hole 132, an inclined top seat guide part 140, an inclined top seat guide hole 141, an ejector plate 150, an ejector component 200, a push plate 210, a needle returning 220, an inclined ejector rod 230, an ejector end 231, a push end 232, a slider 2321, an inclined top seat 240, a dovetail groove 241, a supporting piece 250, a fixing plate 260, an injection molding 300, a first end part 310 and a second end part 320.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions referred to, for example, the directions or positional relationships indicated above, below, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

Reference throughout this specification to the description of "one embodiment," "some embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The ejection mechanism provided by the embodiment of the first aspect of the present application is used for ejecting an injection molded part 300, and includes a lower mold component 100 and an ejection component 200, the lower mold component 100 includes an outer mold core 110 and an inner mold core 120, the inner mold core 120 includes a fixing portion 121 and a product portion 122 protruding from the fixing portion 121, the product portion 122 is disposed through and exposed out of the outer mold core 110, the product portion 122 is used for molding the injection molded part 300, the fixing portion 121 is used for being abutted against and limited by one side surface of the outer mold core 110, and the other side surface of the outer mold core 110 can be abutted against a first end portion 310 of the injection molded part 300; the ejection assembly 200 comprises a push plate 210 and a return pin 220, two ends of the return pin 220 are respectively connected to the push plate 210 and the outer mold core 110, and the push plate 210 can push the outer mold core 110 to move away from the fixing part 121 to eject the injection molded part 300.

For example, as shown in fig. 1 to 2, the ejection mechanism includes a lower mold assembly 100 and an ejection assembly 200, the lower mold assembly 100 includes an outer mold core 110 and an inner mold core 120, the inner mold core 120 includes a fixing portion 121 and a product portion 122 protruding from the fixing portion 121, the product portion 122 is disposed through and exposed out of the outer mold core 110, the product portion 122 is used for molding the injection molded part 300, the fixing portion 121 is used for abutting against and limiting one side surface of the outer mold core 110, and the other side surface of the outer mold core 110 can abut against a first end portion 310 of the injection molded part 300; the ejection assembly 200 includes a push plate 210 and a return pin 220, and both ends of the return pin 220 are respectively connected to the push plate 210 and the outer mold core 110. Referring to fig. 3 to 5, the pushing plate 210 can push the outer mold core 110 to move in a direction away from the fixing portion 121, the outer mold core 110 can abut against the first end portion 310 of the injection molded part 300, when the outer mold core 110 moves in a direction away from the fixing portion 121, the end portion of the injection molded part 300 can be pushed integrally to eject the injection molded part 300 from the product portion 122, the first end portion 310 of the injection molded part 300 is uniformly stressed, and deformation during ejection can be reduced.

It is understood that the pushing plate 210 may be directly connected to the outer mold core 110, or may be connected to the outer mold core 110 through other components, and may be configured to push the outer mold core 110 to move away from the inner mold core 120.

The ejection assembly 200 may further include an inclined ejection rod 230, the inclined ejection rod 230 penetrates through the inner mold core 120, the inclined ejection rod 230 is inclined with respect to the moving direction of the outer mold core 110, the inclined ejection rod 230 has an ejection end 231 and a push end 232, the ejection end 231 abuts against the inside of the second end 320 of the injection molded part 300, the push end 232 is connected to the push plate 210, and the inclined ejection rod 230 can be pushed by the push plate 210 to move along the length direction thereof to eject the injection molded part 300.

For example, as shown in fig. 2, the ejection assembly 200 further includes an inclined ejection rod 230, the inclined ejection rod 230 penetrates through the inner mold core 120, the inclined ejection rod 230 is inclined with respect to the moving direction of the outer mold core 110, the inclined ejection rod 230 has an ejection end 231 and a pushing end 232, the ejection end 231 abuts against the inside of the second end 320 of the injection molding part 300, the pushing end 232 is slidably connected to the pushing plate 210, referring to fig. 3 to 5, the pushing plate 210 can push the inclined ejection rod 230 and the outer mold core 110 to move together, the outer mold core 110 abuts against the first end 310 of the injection molding part 300, and the inclined ejection rod 230 abuts against the inside of the second end 320 of the injection molding part 300 to eject the injection molding part 300 together. For the injection molding part 300 with a deep cavity inside, the outer mold core 110 can only abut against the periphery of the first end part 310 of the injection molding part 300, so that the inclined ejector rod 230 is arranged inside, and the deformation caused by uneven stress on the whole injection molding part 300 can be further prevented. Moreover, the inclined ejector rod 230 moves obliquely, the ejection end 231 can play both the role of ejection and the role of core pulling, and the inside of the injection molding piece 300 can be released.

It is understood that the inclination angle of the moving direction of the lifter 230, the shape of the ejection end 231, and the like can be designed according to the structure and ejection requirement of the injection molding 300, which is not limited in the present application.

The inner core 120 is provided with a slanted ejecting guide hole 123 slanted with respect to the moving direction of the outer core 110, the ejecting end 231 passes through the slanted ejecting guide hole 123 to abut against the inside of the second end 320, and the slanted ejecting guide hole 123 guides the moving direction of the slanted ejecting rod 230.

For example, as shown in fig. 6, the inner core 120 is provided with a slanted ejecting guide hole 123 inclined with respect to the moving direction of the outer core 110, the ejecting end 231 passes through the slanted ejecting guide hole 123 to abut against the inside of the second end 320, and the slanted ejecting guide hole 123 guides the moving direction of the slanted ejecting rod 230, and referring to fig. 3 to 5, the slanted ejecting rod 230 can move along the setting direction of the slanted ejecting guide hole 123, the moving direction of the slanted ejecting rod 230 is more precise, and the stability of the ejecting process can be ensured.

It is understood that the size and the inclined direction of the slanted ejecting guiding hole 123 can be designed according to the structure and the ejecting requirement of the injection molding 300, which is not limited in this application.

The ejection assembly 200 may further include a slanted ejecting seat 240, one end of the slanted ejecting seat 240 is slidably connected to the pushing end 232 of the slanted ejecting rod 230, the other end of the slanted ejecting seat 240 is connected to the pushing plate 210, and the slanted ejecting seat 240 is disposed parallel to the moving direction of the outer mold core 110 and is capable of moving along the length direction of the slanted ejecting seat 240.

For example, as shown in fig. 2, the ejection assembly 200 further includes a slanted ejecting base 240, and one end of the slanted ejecting base 240 is slidably connected to the pushing end 232 of the slanted ejecting rod 230. Specifically, one end of the slanted ejecting seat 240 is provided with a dovetail groove 241, the pushing end 232 of the slanted ejecting rod 230 is provided with a sliding block 2321 corresponding to the dovetail groove 241, and the sliding block 2321 is adapted to be slidably connected along the dovetail groove 241. The other end of the slanted ejecting seat 240 is connected to the push plate 210, and the slanted ejecting seat 240 is disposed parallel to the moving direction of the outer mold core 110 and is movable in the length direction of the slanted ejecting seat 240. Referring to fig. 3 to 5, the inclined top seat 240 can shorten the force arm for pushing the inclined top rod 230, so that the pushing process is more stable.

It can be understood that, in the above-mentioned connection manner of the dovetail groove 241 and the slider 2321, the length of the dovetail groove 241 should be ensured to be greater than or equal to the sliding distance during the ejection process of the oblique mandril 230. The connection mode between the slanted ejecting seat 240 and the slanted ejecting rod 230 is not limited, and is not limited to the connection mode of the dovetail groove 241 and the slider 2321, and may be connected in other forms, and may be set according to actual use requirements.

The lower die assembly 100 may further include a backing plate 130 and an inclined top guide 140, the inner die core 120 is fixed to the backing plate 130, the inclined top guide 140 is located on one side of the backing plate 130 away from the outer die core 110, the inclined top guide 140 is provided with an inclined top guide hole 141, the inclined top 240 penetrates through the inclined top guide hole 141, and the inclined top guide hole 141 is used for guiding the inclined top 240.

For example, as shown in fig. 2, the lower die assembly 100 further includes a backing plate 130 and an inclined top guide 140, referring to fig. 3 and 4, the inner die core 120 is fixed to the backing plate 130, the inclined top guide 140 is located on a side of the backing plate 130 away from the outer die core 110, the inclined top guide 140 is provided with an inclined top guide hole 141, the inclined top 240 is inserted into the inclined top guide hole 141, and the inclined top guide hole 141 is used for guiding the inclined top 240, so as to prevent the inclined top 240 from shifting during the moving process, and ensure the stability of the movement of the inclined top rod 230.

It is understood that the backing plate 130 and the inclined top guide 140 may be integrally formed or may be provided as a separate structure.

It should be noted that the backing plate 130 is further provided with an oblique top pushing hole 131, a part of the oblique top rod 230 is accommodated in the oblique top pushing hole 131, and a cross section of the oblique top rod 230 perpendicular to the length direction of the oblique top rod 230 is smaller than a cross section of the oblique top pushing hole 131 perpendicular to the axis of the oblique top pushing hole 131.

For example, as shown in fig. 3 to 5, the backing plate 130 is provided with an inclined top pushing hole 131, a part of the inclined top rod 230 is accommodated in the inclined top pushing hole 131, and a section of the inclined top rod 230 perpendicular to the length direction of the inclined top rod 230 is smaller than a section of the inclined top pushing hole 131 perpendicular to the axis of the inclined top pushing hole 131, so that the inclined top seat 240 can push the inclined top rod 230 to move in the inclined top pushing hole 131. In the process that the inclined ejector rod 230 is pushed to move by the inclined ejector seat 240, the moving direction of the inclined ejector seat 240 is the same as that of the outer mold core 110, the moving direction of the inclined ejector rod 230 is inclined relative to that of the outer mold core 110, one end, connected with the inclined ejector seat 240, of the inclined ejector rod 230 moves perpendicular to the moving direction of the outer mold core 110 relative to the inclined ejector seat 240, and the inclined ejector rod 230 can be prevented from interfering with the backing plate 130 in the moving process by arranging the inclined ejector pushing hole 131 in the backing plate 130.

The inclined ceiling guide 140 and the pad 130 are separate members.

For example, as shown in fig. 2, the slanted ejecting guide 140 and the shim plate 130 are separate structures, and referring to fig. 3 to 5, the slanted ejecting guide 140 is connected to the shim plate 130 on a side away from the outer core 110. The lifter 240 frequently moves in the lifter guide hole 141, which easily causes abrasion of the lifter guide 140, and the lifter guide 140 is provided with a split structure, so that after the lifter guide 140 is abraded, only the split lifter guide 140 can be replaced without integrally replacing the backing plate 130, thereby reducing the cost.

The lower die assembly 100 may further include an ejector plate 150 and a backing plate 130, the outer die core 110 is embedded on a side of the ejector plate 150 away from the inner die core 120, and the ejector plate 150 limits the movement of the outer die core 110 towards the inner die core 120; the inner mold core 120 is fixed on the backing plate 130, the backing plate 130 is provided with a needle returning guide hole 151, the needle returning 220 penetrates through the needle returning guide hole 151, and two ends of the needle returning 220 are respectively connected to the push plate 210 and the ejector plate 150.

For example, as shown in fig. 1 to 2, the lower die assembly 100 further includes an ejector plate 150 and a backing plate 130, the outer die core 110 is embedded in a side of the ejector plate 150 away from the inner die core 120, and the ejector plate 150 limits the movement of the outer die core 110 toward the inner die core 120; the inner mold core 120 is fixed to the backing plate 130, the backing plate 130 is provided with a needle returning guide hole 132, the needle return 220 is arranged through the needle returning guide hole 132, and two ends of the needle return 220 are respectively connected to the push plate 210 and the ejector plate 150. The needle returning guide hole 132 can guide the needle returning 220, so that the moving direction of the outer mold core 110 in the ejection process is accurate, and the stability of the ejection process is improved.

It can be understood that the clip 220, the push plate 210 and the eject plate 150 can be connected by screw connection, glue connection, clamping connection, etc.

The ejector assembly 200 may further include a support 250 for supporting the inner core 120, and the push plate 210 may be capable of reciprocating in a direction of a supporting force of the inner core 120 by the support 250.

For example, as shown in fig. 1 to 2, the ejector assembly 200 further includes a support 250 for supporting the inner core 120, and the push plate 210 is capable of reciprocating in a direction of a supporting force of the inner core 120 by the support 250. The support 250 can support the moving space of the push plate 210 at one side of the inner core 120.

It is to be understood that the structural form of the support member 250 is not limited and may be provided as a plate member, a rod member, etc. The supporting member 250 has one end connected to the inner core 120 and the other end connected to the fixing plate 260, and the push plate 210 reciprocates between the fixing plate 260 and the inner core 120. In actual use, the fixing plate 260 may be fixed to the injection molding apparatus to fix the entire ejection mechanism.

An ejection mechanism according to an embodiment of the present application is described in detail below in one complete embodiment with reference to fig. 1 to 6. It is to be understood that the following description is illustrative only and is not intended to be in any way limiting.

The ejection mechanism includes a lower die assembly 100 and an ejection assembly 200.

The lower mold assembly 100 includes an outer mold core 110, an inner mold core 120, a shim plate 130, a slanted top guide 140, and a knock-out plate 150.

The inner mold core 120 comprises a fixing portion 121 and a product portion 122 protruding from the fixing portion 121, the product portion 122 penetrates through and is exposed out of the outer mold core 110, the product portion 122 is used for molding the injection molded part 300, the fixing portion 121 is used for being abutted against and limited with one side surface of the outer mold core 110, the other side surface of the outer mold core 110 can be abutted against and held at a first end portion 310 of the injection molded part 300, the outer mold core 110 is embedded in the ejector plate 150, the inner mold core 120 is embedded in one side of the backing plate 130, and the inclined ejector guide portion 140 is connected to one side of the backing plate 130, which is far away from the inner mold core 120. The inner core 120 has an inclined top guide hole 123 inclined with respect to the moving direction of the outer core 110.

The ejection assembly 200 includes a push plate 210, a return pin 220, an inclined ejection rod 230, an inclined ejection seat 240, a support 250, and a fixing plate 260.

A support 250 is disposed between the pad plate 130 and the fixing plate 260, and a pushing space is defined between the pad plate 130, the fixing plate 260 and the support 250. The push plate 210 is received in the push space and is movable relative to the inner core 120. The needle 220 is inserted through the backing plate 130, and both ends of the needle are connected to the pushing plate 210 and the ejecting plate 150, respectively. The slanted ejecting seat 240 is inserted into the slanted ejecting seat guiding hole 141 of the slanted ejecting seat guiding portion 140, one end of the slanted ejecting seat 240 is connected to the pushing plate 210, and the other end is connected to the pushing end 232 of the slanted ejecting rod 230. The inclined top rod 230 is arranged in the inclined top guide hole 123 of the inner mold core 120 in a penetrating way, and the ejection end 231 of the inclined top rod 230 can be abutted against the inside of the second end part 320 of the injection molding piece 300.

The process of ejecting injection molded part 300 is: the pushing plate 210 moves towards the direction close to the backing plate 130, the return pin 220 pushes the ejector plate 150 to move, and the outer mold core 110 is driven to push the first end 310 of the injection molding piece 300; the inclined top seat 240 extends into the inclined top pushing hole 131 of the base plate 130 and pushes the inclined top rod 230 to move along the inclined top guiding hole 123, so that the ejection end 231 of the inclined top rod 230 moves obliquely, and ejection and core pulling of the inner part of the second end part 320 of the injection molding part 300 are completed.

The embodiment of the second aspect of the present application provides an injection mold, including: the ejection mechanism provided in any of the embodiments above; go up the mould subassembly, go up the mould subassembly and set up with the lower mould subassembly is relative, go up the mould subassembly and can inject the die cavity with the lower mould subassembly, the die cavity is used for the injection moulding of injection molding 300.

The ejection mechanism capable of enabling the injection molding piece 300 to be evenly stressed in the ejection process is adopted, so that the deformation of the injection molding piece 300 can be reduced, the generation of defective products is reduced, the yield is improved, and the production efficiency is improved.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims (10)

1. Ejection mechanism for ejecting injection molding, its characterized in that includes:

the lower die assembly comprises an outer die core and an inner die core, wherein the inner die core comprises a fixing part and a product part protruding from the fixing part; the product part is arranged in a penetrating manner and exposed out of the outer mold core, and the product part is used for molding the injection molding piece; the fixing part is used for being abutted and limited with one side surface of the outer mold core;

the other side surface of the outer mold core can be abutted against the first end part of the injection molding piece;

and the ejection assembly comprises a push plate and a return needle, two ends of the return needle are respectively connected to the push plate and the outer mold core, and the push plate can push the outer mold core to move towards the direction far away from the fixed part so as to eject the injection molding piece.

2. The ejection mechanism of claim 1, further comprising a diagonal ejector rod penetrating the inner mold core, the diagonal ejector rod being inclined with respect to a direction of movement of the outer mold core, the diagonal ejector rod having an ejector end abutting an interior of the second end portion of the injection molded part and a push end slidably connected to the push plate, the diagonal ejector rod being movable by the push plate along its length to eject the injection molded part.

3. The ejection mechanism of claim 2, wherein the inner core is provided with a slanted ejecting guide hole inclined with respect to the moving direction of the outer core, the ejecting end passes through the guide hole to abut against the inside of the second end portion of the injection molded part, and the slanted ejecting guide hole guides the moving direction of the slanted ejecting rod.

4. The ejection mechanism as claimed in claim 2, wherein the ejection assembly further comprises a slanted ejecting base, one end of the slanted ejecting base is slidably connected with the pushing end of the slanted ejecting rod, the other end of the slanted ejecting base is connected to the pushing plate, and the slanted ejecting base is disposed in parallel with the moving direction of the outer mold core and can move along the length direction of the slanted ejecting base.

5. The ejection mechanism according to claim 4, wherein the lower mold assembly further comprises a base plate and an inclined top seat guide portion, the inner mold core is fixed on the base plate, the inclined top seat guide portion is located on one side, away from the outer mold core, of the base plate, the inclined top seat guide portion is provided with an inclined top seat guide hole, the inclined top seat penetrates through the inclined top seat guide hole, and the inclined top seat guide hole is used for guiding the inclined top seat.

6. The ejection mechanism as claimed in claim 5, wherein the base plate is provided with an inclined top pushing hole, part of the inclined top rod is accommodated in the inclined top pushing hole, and the section of the inclined top rod perpendicular to the length direction of the inclined top rod is smaller than the section of the inclined top pushing hole perpendicular to the axis of the inclined top pushing hole.

7. The ejection mechanism of claim 5, wherein the slanted ejecting seat guide portion and the base plate are of a separate structure.

8. The ejection mechanism as claimed in claim 1, wherein the lower mold assembly further comprises a backing plate and an ejector plate, the outer mold core is embedded in one side of the ejector plate away from the inner mold core, and the ejector plate limits the outer mold core to move towards the inner mold core; the inner mold core is fixed on the base plate, the base plate is provided with a back needle guide hole, the back needle penetrates through the back needle guide hole, and two ends of the back needle are respectively connected with the push plate and the ejector plate.

9. The ejection mechanism according to any one of claims 1 to 8, wherein the ejection assembly further comprises a support for supporting the inner core, and the push plate is capable of reciprocating in a direction of a supporting force of the support against the inner core.

10. An injection mold, comprising:

the ejection mechanism of any one of claims 1 to 9;

go up the mould subassembly, go up the mould subassembly with the lower mould subassembly sets up relatively, go up the mould subassembly with the die cavity can be injectd to the lower mould subassembly, the die cavity is used for the injection moulding of injection molding.

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