CN216683195U - Ejection mechanism and mold - Google Patents

Abstract

The utility model belongs to the technical field of dies, and particularly relates to an ejection mechanism which is applied to a die, wherein the die is provided with a plurality of forming cavities; the ejection mechanism comprises an intermediate die, a lower die core, an ejector pin flow channel, a push plate, a first ejector pin, a second ejector pin, a clearance groove and a plurality of return pins, wherein the lower die core is arranged on the intermediate die and sealed below the forming cavity; the thimble flow passage penetrates through the axial direction of the middle die and the lower die core and is communicated with the forming cavity; the upper end of the ejector pin movably extends out of the ejector pin flow passage; the upper end of the ejector pin movably extends out of the ejector pin flow passage; the upper end of the back needle is fixedly connected with the middle die; the lower ends of the first thimble and the second thimble are fixedly arranged on the push plate, and the lower end of the return needle is movably arranged on the push plate; the plurality of empty avoiding grooves are arranged on the push plate, and each empty avoiding groove correspondingly avoids an empty return pin to obtain a lower end; when the ejector pin is ejected, the push plate moves upwards, the first ejector pin and the second ejector pin extend out of the ejector pin flow channel, the bottom surface of the clearance groove is attached to the bottom surface of the return pin, and the return pin is pushed to eject the middle die to move upwards. The purpose of demoulding is achieved, and the demoulding efficiency is improved.

Description

Ejection mechanism and mold

Technical Field

The utility model belongs to the technical field of dies, and particularly relates to an ejection mechanism and a die.

Background

In the production of the injection mold in the prior art, the direct ejector rod top and the stripper plate are combined to eject at one time. For some products with large curvature or bending type, after the plastic workpiece is ejected and demoulded, the plastic workpiece is easy to clamp on a die, the workpiece cannot automatically fall off, after the plastic workpiece is ejected once, the workpiece cannot completely fall off the die or cannot be separated by an ejection mechanism, manual demoulding is needed, or the ejection stroke of the ejection mechanism needs to be increased, so that the time is consumed, and the product processing efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an ejection mechanism, and aims to solve the technical problems that in the prior art, a die workpiece cannot be completely separated from a die or the workpiece cannot be separated by the ejection mechanism, and the product processing efficiency is influenced.

In order to achieve the above object, an ejection mechanism provided in an embodiment of the present invention is applied to a mold, where the mold has a plurality of molding cavities; the ejection mechanism comprises a middle die, a lower die core, a plurality of thimble runners, a push plate, a plurality of first thimbles, a plurality of second thimbles, a plurality of clearance grooves and a plurality of return pins, and the lower die core is arranged on the middle die and sealed below the forming cavity; the thimble flow channel penetrates through the middle die and the lower die core in the axial direction and is communicated with the forming cavity; the upper end of the ejector pin extends out of the ejector pin flow passage movably; the upper end of the ejector pin extends out of the ejector pin flow passage movably; the upper end of the back needle is fixedly connected with the middle die; the lower ends of the first thimble and the second thimble are fixedly arranged on the push plate, and the lower end of the return needle is movably arranged on the push plate; the plurality of empty avoiding grooves are arranged on the push plate, and each empty avoiding groove correspondingly avoids the lower end of one back needle; when the ejector pin is ejected, the push plate moves upwards, the first ejector pin and the second ejector pin extend out of the ejector pin flow channel, and the bottom surface of the clearance groove is attached to the bottom surface of the return pin and pushes the return pin to eject the intermediate die to move upwards.

Preferably, the number of the first ejector pins is one, the number of the second ejector pins is two, the first ejector pins are located between the two second ejector pins, the diameter of the first ejector pins is wider than that of the second ejector pins, and the first ejector pins push the middle of the lower die core.

Preferably, the push plate comprises an upper plate and a lower plate, the first ejector pins, the second ejector pins and the return pins are arranged on the upper plate, the clearance grooves are formed in the lower plate, and the lower plate pushes the upper plate.

Preferably, a fixing piece is further arranged below the middle die, the ejection mechanism is further provided with a plurality of insert grooves which penetrate through the lower die core, the fixing piece and the middle die in the axial direction, a plurality of inserts are fixed on the fixing piece, and the inserts are embedded into the insert grooves and sealed at the lower end of the forming cavity.

Preferably, the number of the molding cavities is four, the number of the inserts is four, the upper ends of the four inserts are respectively sealed at the lower ends of the four molding cavities, and the lower ends of the four inserts are respectively fixed on the fixing piece.

Preferably, an exhaust needle is embedded in each insert, and the top surface of each exhaust needle is flush with the top surface of each insert.

Preferably, the number of the back needles is two, the two back needles are respectively arranged at two ends of the push plate, and the two back needles are in threaded connection with the middle die.

Preferably, a spring is sleeved on each of the two return pins, and two end faces of the spring are respectively abutted to the upper plate and the middle die.

In order to achieve the above object, an embodiment of the present invention provides a mold, which includes an upper mold core, an upper mold base, a lower mold base, and the ejection mechanism; the upper die frame is embedded with a sprue bush, one end of the sprue bush extends to the top of the upper die frame, and the other end of the sprue bush is communicated with the forming cavity. The upper die core is arranged on the upper die frame; the upper die frame, the upper die core, the lower die core, the middle die, the push plate and the lower die frame are sequentially arranged along the vertical direction, and the middle die and the push plate are movably connected to the lower die frame; when the die is closed, a plurality of forming cavities are formed between the upper die core and the lower die core;

preferably, the mold further comprises a positioning ring, and the positioning ring is arranged at the top of the sprue bush to fix the sprue bush.

The technical scheme or the technical schemes in the ejection mechanism and the mould provided by the embodiment of the utility model at least have one of the following technical effects: when the ejector pin is ejected, the push plate pushes the first ejector pin and the second ejector pin to extend out of the ejector pin flow channel, the product is ejected once, the return pin is not moved during the ejection, the push plate continues to be ejected, at the moment, the bottom of the return pin enters the empty avoiding groove, the bottom surface of the empty avoiding groove is attached to the bottom surface of the return pin and pushes the return pin to eject the middle die, the lower die core ejects the product twice, the purpose of demolding is achieved, and the working efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a mold according to an embodiment of the present invention.

Fig. 2 is a left side view of a mold provided in an embodiment of the utility model.

Fig. 3 is a sectional view taken along line a-a in fig. 2.

Fig. 4 is a front view of a mold provided by an embodiment of the present invention.

Fig. 5 is a sectional view taken along line B-B in fig. 4.

Fig. 6 is a partially enlarged view of the region C shown in fig. 3.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, 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 accompanying drawings are illustrative and intended to explain the embodiments of the present invention and should not be construed as limiting the utility model.

In the description of the embodiments of the present invention, it should be understood that, if directional indications are provided in the embodiments of the present invention, such as directions of up, down, left, right, front, back, inner, outer, etc., the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, terms such as "mounted," "connected," and "fixed" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In one embodiment of the present invention, as shown in fig. 1-6, an ejection mechanism 10 is provided for use with a mold 1, the mold 1 having a plurality of molding cavities (not shown); the ejection mechanism 10 includes a middle mold 11, a lower mold core 12, a plurality of thimble runners 13, a push plate 14, a plurality of first thimbles 15, a plurality of second thimbles 16, a plurality of clearance grooves 17 and a plurality of return pins 18, the lower mold core 12 is arranged on the middle mold 11 and sealed below the molding cavity (not shown); the thimble flow channel 13 penetrates through the middle die 11 and the lower die core 12 in the axial direction and is communicated with the molding cavity (not shown); the upper end of the ejector pin extends out of the ejector pin flow channel 13 movably; the upper end of the ejector pin extends out of the ejector pin flow channel 13 movably; the upper end of the back needle 18 is fixedly connected with the middle die 11; the lower ends of the first thimble 15 and the second thimble 16 are fixedly arranged on the push plate 14, and the lower end of the return pin 18 is movably arranged on the push plate 14; the plurality of clearance grooves 17 are all arranged on the push plate 14, and each clearance groove 17 is corresponding to the lower end of one return needle 18.

When the product is ejected, the push plate 14 moves upwards, the first ejector pin 15 and the second ejector pin 16 extend out of the ejector pin flow channel 13, the product is ejected once, the return pin 18 is not moved during the ejection, the push plate 14 continues to eject, at the moment, the bottom of the return pin 18 enters the empty avoiding groove 17, the bottom surface of the empty avoiding groove 17 is attached to the bottom surface of the return pin 18 and pushes the return pin 18 to eject the intermediate die 11 to move upwards, the intermediate die 11 drives the lower die core 12 to move upwards, and the lower die core 12 ejects the product for a second time, so that the purpose of demolding is achieved, and the demolding effect is improved.

In another embodiment of the present invention, as shown in fig. 6, the number of the first pins 15 is one, the number of the second pins 16 is two, the first pins 15 are located between the two second pins 16, the diameter of the first pins 15 is wider than that of the second pins 16, and the first pins 15 push the middle of the lower mold core 12. Through the design, the ejection force is uniformly and stably distributed, and the product can be uniformly ejected.

In another embodiment of the present invention, as shown in fig. 3, 5 and 6, the push plate 14 includes an upper plate 141 and a lower plate 142, the first pins 15, the second pins 16 and the return pins 18 are all disposed on the upper plate 141, the clearance groove 17 is disposed on the lower plate 142, and the lower plate 142 pushes the upper plate 141. The lower plate 142 and the upper plate 141 are provided, so that the first thimble 15, the plurality of second thimbles 16 and the plurality of return pins 18 are convenient to install.

In another embodiment of the present invention, as shown in fig. 6, a fixing member 18 is further disposed below the middle mold 11, the ejection mechanism 10 is further provided with a plurality of insert grooves (not shown) axially penetrating through the lower mold core 12, the fixing member 18 and the middle mold 11, a plurality of inserts 19 are fixed on the fixing member 18, and a plurality of inserts 19 are inserted into the plurality of insert grooves (not shown) and sealed at the lower end of the molding cavity (not shown). When the colloid is injected, the colloid is filled in the molding cavity (not shown), and some gas existing in the gap is extruded and discharged from the insert 19, so that the quality of the product is improved, and the product is convenient to demould.

In another embodiment of the present invention, as shown in fig. 6, the number of the molding cavities (not shown) is four, the number of the inserts 19 is four, the upper ends of the four inserts 19 are respectively sealed to the lower ends of the four molding cavities (not shown), and the lower ends thereof are respectively fixed to the fixing member 18. When the colloid is injected, the colloid is filled in the four molding cavities (not shown), and some gas existing in the gaps is extruded and discharged from the insert 19, so that the quality of the product is improved, and the product is convenient to demould.

In another embodiment of the present invention, as shown in fig. 6, an exhaust needle 191 is embedded in each of the inserts 19, and the top surface of the exhaust needle 191 is flush with the top surface of the insert 19. The influence of vacuum in the molding cavity (not shown) during molding is eliminated, and the demolding effect is improved.

In another embodiment of the present invention, as shown in fig. 5, the number of the return pins 18 is two, two return pins 18 are respectively disposed at two ends of the push plate 14, and the two return pins 18 are screwed with the intermediate mold 11. Simple structure and simple to operate.

In another embodiment of the present invention, as shown in fig. 5 to 6, a spring 181 is sleeved on each of the two return pins 18, and two end surfaces of the spring 181 abut against the upper plate 141 and the middle mold 11 respectively. The product can be conveniently separated from the lower die core 12, and the product and the die 1 are prevented from being damaged by die drawing.

In another embodiment of the present invention, as shown in fig. 3, 5 and 6, a mold 1 is provided, which includes an upper mold core 20, an upper mold frame 21, a lower mold frame 22 and the ejection mechanism 10; a sprue bush 23 is embedded in the upper die frame 21, one end of the sprue bush 23 extends to the top of the upper die frame 21, and the other end of the sprue bush 23 is communicated with the forming cavity (not shown). The upper die core 20 is mounted on the upper die frame 21; the upper mold frame 21, the upper mold core 20, the lower mold core 12, the middle mold 11, the push plate 14 and the lower mold frame 22 are sequentially arranged in a vertical direction, and the middle mold 11 and the push plate 14 are movably connected to the lower mold frame 22; when the dies are closed, a plurality of forming cavities (not shown) are formed between the upper die core 20 and the lower die core 12; when the die is closed, the colloid enters the forming cavity (not shown) from the sprue bush 23 for forming and cooling; and (3) opening the mold, wherein the push plate 14 moves upwards, the first ejector pin 15 and the second ejector pin 16 firstly extend out of the ejector pin flow channel 13 to eject the product once, then the bottom surface of the clearance groove 17 is attached to the bottom surface of the return pin 18 and pushes the return pin 18 to eject the intermediate mold to move upwards to eject the product for the second time, so that the purpose of demolding is achieved, and the working efficiency is improved.

In another embodiment of the utility model, as shown in fig. 3, the mold 1 further comprises a retaining ring 24, the retaining ring 24 being provided on top of the sprue bush 23 to fix the sprue bush 23. The sprue bush 23 of the mould 1 is ensured to be horizontally and completely coincided with the nozzle of the injection molding machine. The glue is convenient to enter, and the working efficiency is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An ejection mechanism is applied to a mold, and the mold is provided with a plurality of molding cavities; it is characterized by comprising:

an intermediate die;

the lower die core is arranged on the middle die and sealed below the forming cavity;

the ejector pin flow passages penetrate through the middle die and the lower die core in the axial direction and are communicated with the forming cavity;

the upper ends of the first thimbles movably extend out of the thimble flow channels;

the upper ends of the second thimbles movably extend out of the thimble flow channels;

the upper ends of the back needles are fixedly connected with the middle die;

the lower ends of the first thimble and the second thimble are fixedly arranged on the push plate, and the lower end of the return pin is movably arranged on the push plate; and

the plurality of empty-avoiding grooves are arranged on the push plate, and each empty-avoiding groove correspondingly avoids an empty part of the lower end of the return pin; when the ejector plate is ejected, the ejector plate moves upwards, the first ejector pin and the second ejector pin extend out of the ejector pin flow channel, and the bottom surface of the clearance groove is attached to the bottom surface of the return pin and pushes the return pin to eject the intermediate die to move upwards.

2. The ejection mechanism according to claim 1, wherein the number of the first pins is one, the number of the second pins is two, the first pins are located between the two second pins, and the diameter of the first pins is wider than that of the second pins, and the first pins push the middle portion of the lower mold core.

3. The ejection mechanism of claim 1, wherein the push plate includes an upper plate and a lower plate, the first plurality of ejector pins, the second plurality of ejector pins, and the return pins are disposed on the upper plate, the clearance groove is disposed on the lower plate, and the lower plate pushes the upper plate.

4. The ejection mechanism as claimed in claim 1, wherein a fixing member is further disposed below the middle mold, the ejection mechanism further has a plurality of insert grooves axially penetrating through the lower mold core, the fixing member and the middle mold, the fixing member is fixed with a plurality of inserts, and the inserts are inserted into the insert grooves and sealed at the lower end of the molding cavity.

5. The ejection mechanism according to claim 4, wherein the number of the molding cavities is four, the number of the inserts is four, the upper ends of the four inserts are respectively sealed with the lower ends of the four molding cavities, and the lower ends of the four inserts are respectively fixed on the fixing member.

6. The ejection mechanism of claim 4, wherein an exhaust pin is embedded in each insert, and a top surface of the exhaust pin is flush with a top surface of the insert.

7. The ejection mechanism according to any one of claims 1 to 4, wherein the number of the return pins is two, two return pins are respectively provided at both ends of the push plate, and the two return pins are screwed with the intermediate die.

8. An ejection mechanism according to claim 3, wherein a spring is sleeved on each of the two return pins, and two end faces of the spring respectively abut against the upper plate and the intermediate die.

9. A mold, comprising:

an upper mold core;

an upper mold frame; a sprue bush is embedded in the upper die frame, one end of the sprue bush extends to the top of the upper die frame, and the other end of the sprue bush is communicated with the forming cavity;

the upper die core is arranged on the upper die frame; and

the ejection mechanism of any one of claims 1-8; the upper die frame, the upper die core, the lower die core, the middle die, the push plate and the lower die frame are sequentially arranged along the vertical direction, and the middle die and the push plate are movably connected to the lower die frame; when the die is closed, a plurality of forming cavities are formed between the upper die core and the lower die core.

10. The mold of claim 9, further comprising a retaining ring disposed on top of the sprue bushing to secure the sprue bushing.

Images