Ejection mechanism and injection mold

Abstract

The ejection mechanism comprises a rear fixing plate, a rear mold plate and ejector plates movably arranged between the rear fixing plate and the rear mold plate, the ejector plates comprise the upper ejector plate, the middle ejector plate and the lower ejector plate, a straight ejector is installed on the upper ejector plate, a sleeve is movably installed on the upper ejector plate and the middle ejector plate in a penetrating mode, and the lower ejector plate is movably installed on the sleeve in a penetrating mode. The lower ejector plate is provided with a sleeve, the sleeve upwards extends out of the upper ejector plate, the sleeve is internally provided with a submerged ejector pin synchronously moving with the sleeve, the upper end of the submerged ejector pin can upwards extend out of the rear mold plate, and the upper end of the submerged ejector pin is provided with a submerged gate. A spring is arranged between the supporting needle and the lower ejector plate, an inclined ejection mechanism is mounted on the lower ejector plate and comprises an inclined ejection rod and an inclined ejection needle, the inclined ejection rod is mounted on the lower ejector plate and upwards extends into the rear mold plate, the inclined ejection needle is movably arranged on the rear mold plate and can upwards extend out of the rear mold plate, and the injection mold comprises the ejection mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mould field especially a kind of ejection mechanism and injection mould. BACKGROUND

[0002] With the increasing diversification of injection molding product structure, the design of injection molding mold also faces unprecedented challenges to adapt to these complex and changeable product requirements. Especially for those injection molding products with hidden sheet structure, the mold design needs to be carefully considered.

[0003] At present, the common injection molding mold in the market generally adopts secondary ejection structure design when dealing with hidden sheet structure. This design contains two relatively independent ejection stages: first stroke ejection structure and second stroke ejection structure. In the first stroke, the ejection structure initially separates the product from the mold body; then, in the second stroke, another set of ejection mechanism is started to ensure that the hidden sheet structure can be smoothly demolded.

[0004] However, the complexity of this secondary ejection structure not only reflects in the multi-level and multi-component structure, but also leads to the increase of the overall space occupied by the mold. In addition, due to the need to manufacture and assemble multiple ejection mechanisms, the production cost also rises accordingly. These problems undoubtedly bring not small trouble to the design and production of injection molding mold, and also increase the operating cost of enterprises. SUMMARY

[0005] Therefore, the purpose of the utility model is to provide an ejection mechanism and injection molding mold with simple structure and convenient hidden sheet structure separation.

[0006] In order to achieve the above purpose, the utility model provides an ejection mechanism, which comprises a rear fixed plate, a rear mold plate located above the rear fixed plate, and a needle plate movably arranged between the rear fixed plate and the rear mold plate. The needle plate comprises an upper needle plate, a middle needle plate and a lower needle plate which are stacked from top to bottom. A straight needle is installed on the upper needle plate, and the lower end of the straight needle abuts against the middle needle plate. The upper needle plate and the middle needle plate are movably installed through a sleeve. The sleeve protrudes upward from the upper needle plate. A hidden sheet needle that moves synchronously with the sleeve is installed in the sleeve. The upper end of the hidden sheet needle can protrude upward from the rear mold plate. A hidden sheet glue port is arranged at the upper end of the hidden sheet needle. A support needle that abuts against the hidden sheet needle is movably arranged below the hidden sheet needle. A spring is arranged between the support needle and the lower needle plate. An inclined ejection mechanism is installed on the lower needle plate. The inclined ejection mechanism comprises an inclined ejection rod and an inclined ejection needle movably connected with the inclined ejection rod. The inclined ejection rod is installed on the lower needle plate and protrudes upward into the rear mold plate. The inclined ejection needle is movably arranged on the rear mold plate and can protrude upward from the rear mold plate,

[0007] When the ejection mechanism is changed from the clamping state to the unclamping state, the upper pin plate, the middle pin plate and the lower pin plate move upward synchronously to drive the straight pin, the inclined pin and the flash pin upward to abut against the product until the upper surface of the sleeve abuts against the back plate, the flash pin stops moving upward, the straight pin and the inclined pin continue to move upward, the flash structure of the product is separated from the flash gate, and the product demolding is completed.

[0008] Further, the upper pin plate is provided with a first fixed groove for mounting the straight pin, and the lower end of the straight pin is fixed in the first fixed groove.

[0009] Further, the middle pin plate and the upper pin plate are provided with a movable groove for mounting the sleeve, the movable groove comprises a sliding groove penetrating upward, the lower end of the sliding groove is communicated with a limiting groove penetrating downward, the diameter of the limiting groove is larger than that of the sliding groove, the sleeve has a sliding part in a cylindrical shape and a limiting part in a cylindrical shape connected with the lower end of the sliding part, the diameter of the limiting part is larger than that of the sliding part, the sliding part is slidably arranged in the sliding groove, and the limiting part is slidably arranged in the limiting groove.

[0010] Further, the flash pin has a body part extending vertically and an abutting part connected with the lower end of the body part, the diameter of the abutting part is larger than that of the body part, the body part of the flash pin penetrates the sleeve, the abutting part is located inside the limiting part and moves synchronously with the limiting part, and the flash gate is located at the upper end of the body part.

[0011] Further, the lower pin plate is recessed with a groove below the movable groove of the middle pin plate, the diameter of the groove is the same as that of the limiting groove, the supporting pin and the spring are arranged in the groove, the supporting pin has a supporting column extending vertically and an abutting part connected with the upper end of the supporting column, the diameter of the abutting part is larger than that of the supporting column, the spring is sleeved around the supporting column and abuts against the lower surface of the abutting part and the bottom wall of the groove at two ends respectively.

[0012] Further, the bottom wall of the groove is provided with an avoiding groove penetrating downward, the diameter of the avoiding groove is smaller than that of the groove, the lower end of the supporting column penetrates the avoiding groove and extends downward beyond the lower surface of the lower pin plate.

[0013] Further, the lower surface of the back plate is provided with a plurality of limiting columns arranged at intervals, and the upper pin plate abuts against the limiting columns when unclamping.

[0014] Furthermore, the rear template is fitted with an inclined top sleeve corresponding to the inclined top rod. The limiting post is a limiting screw. The limiting screw is threaded onto the rear template, and the nut of the limiting screw abuts against the lower surface of the inclined top sleeve to fix the inclined top sleeve onto the rear template. The nut does not interfere with the inclined top rod.

[0015] Furthermore, the ejection mechanism also includes a mold core, which is mounted on the rear template. The mold core has a first through hole, a second through hole, and a third through hole for accommodating the straight ejector pin, the angled ejector pin, and the submerged ejector pin.

[0016] An injection mold includes an ejection mechanism as described above. The injection mold also includes a front fixed plate and a front template mounted on the front fixed plate. When the mold is closed, the front template and the rear template move closer to each other and form a mold cavity for molding the product.

[0017] The advantage of this invention lies in its significant optimization of the mold ejection mechanism through the ingenious addition of an ejector sleeve, ejector pin, and spring assembly. When the ejector pin extends to a preset distance, the sleeve precisely contacts the mold blank surface, and the spring is then compressed, effectively preventing the ejector pin from extending further. At this point, the other ejection mechanisms continue operating, ensuring smooth separation of the sprue from the ejector pin. This design not only improves the accuracy and stability of the ejection process but also significantly reduces the risk of damage to the mold and ejector pins.

[0018] The ejection mechanism and injection mold provided by this utility model allow the product's submerged piece to detach from the submerged piece opening of the submerged piece ejector when the straight ejector pin ejects the product upward and the submerged piece ejector pin stops moving upward. This not only has a simple structure, but also allows the submerged piece to detach from the submerged piece opening and finally eject the product by means of the height difference between the straight ejector pin and the submerged piece ejector pin, making product demolding very convenient. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of an injection mold according to the present invention.

[0021] Figure 2 for Figure 1 The top view of the injection mold shown.

[0022] Figure 3for Figure 2 The image shows a cross-sectional view of the injection mold along the DD plane.

[0023] Figure 4 for Figure 3 A magnified view of part A of the injection mold shown.

[0024] Figure 5 for Figure 3 A magnified view of part B of the injection mold shown.

[0025] Figure 6 for Figure 3 A magnified view of part C of the injection mold shown. Detailed Implementation

[0026] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0027] The terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0028] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0029] Please see Figures 1-3 and Figure 6This utility model provides an ejection mechanism, including a rear fixing plate 10, a rear template 30 located above the rear fixing plate 10, and an ejector plate 20 movably disposed between the rear fixing plate 10 and the rear template 30. The ejector plate 20 includes an upper ejector plate 23, a middle ejector plate 22, and a lower ejector plate 21 stacked sequentially from top to bottom. A straight ejector pin 50 is installed on the upper ejector plate 23, and the lower end of the straight ejector pin 50 abuts against the middle ejector plate 22. A sleeve 231 is movably installed through the upper ejector plate 23 and the middle ejector plate 22. The sleeve 231 extends upward from the upper ejector plate 23, and a submerged ejector pin that moves synchronously with the sleeve 231 is installed inside the sleeve 231. 60. The upper end of the submerged ejector pin 60 can extend upwards out of the rear template 30. The upper end of the submerged ejector pin 60 is provided with a submerged ejector opening. The lower ejector plate 21 is located below the submerged ejector pin 60 and is movably disposed with a support pin 212 that abuts against the submerged ejector pin 60. A spring 213 is disposed between the support pin 212 and the lower ejector plate 21. An inclined ejector mechanism 70 is mounted on the lower ejector plate 21. The inclined ejector mechanism 70 includes an inclined ejector rod 71 and an inclined ejector pin 72 movably connected to the inclined ejector rod 71. The inclined ejector rod 71 is mounted on the lower ejector plate and extends upwards into the rear template 30. The inclined ejector pin 72 is movably disposed on the rear template 30 and can extend upwards out of the rear template 30.

[0030] When the ejection mechanism changes from the mold-closed state to the mold-open state, the upper ejector plate 23, the middle ejector plate 22, and the lower ejector plate 21 move upward synchronously, driving the straight ejector pin 50, the angled ejector pin 72, and the submerged ejector pin 60 to push the product upward until the upper surface of the sleeve 231 touches the rear mold plate 30. The submerged ejector pin 60 stops moving upward, while the straight ejector pin 50 and the angled ejector pin 72 continue to move upward. The submerged structure of the product disengages from the submerged ejector gate, completing the demolding of the product.

[0031] Please see Figure 3 and Figure 5 The upper ejector plate 23 is provided with a first fixing groove 232 for mounting the straight ejector pin 50, and the lower end of the straight ejector pin 50 is fixed in the first fixing groove 232. More specifically, the first fixing groove 232 includes an upwardly penetrating receiving groove, the lower end of which is connected to a fixing groove. The diameter of the fixing groove is larger than the diameter of the receiving groove. The straight ejector pin 50 includes a vertically extending needle body and a fixing part located at the lower end of the needle body. The diameter of the fixing part is larger than the diameter of the needle body. The needle body is located in the receiving groove, and the fixing part is fixed in the fixing groove. When the upper ejector plate 23 moves up and down, the straight ejector pin 50 moves synchronously with the upper ejector plate 23.

[0032] Please see Figure 3and Figure 4 The middle ejector plate 22 and the upper ejector plate 23 are provided with a movable groove 221 for mounting the sleeve 231. The movable groove 221 includes an upward sliding groove, and the lower end of the sliding groove is connected to a downward limiting groove. The diameter of the limiting groove is larger than the diameter of the sliding groove. The sleeve 231 has a cylindrical sliding part and a cylindrical limiting part connected to the lower end of the sliding part. The diameter of the limiting part is larger than the diameter of the sliding part. The sliding part is slidably disposed in the sliding groove, and the limiting part is slidably disposed in the limiting groove.

[0033] The submersible ejector pin 60 has a vertically extending body portion 61 and an abutment portion 62 connected to the lower end of the body portion. The diameter of the abutment portion 62 is larger than the diameter of the body portion 61. The body portion 61 of the submersible ejector pin 60 penetrates the sleeve 231, and the abutment portion 62 is located inside the limiting portion and moves synchronously with the limiting portion. The submersible insert is located at the upper end of the body portion.

[0034] The lower ejector plate 21 is recessed below the movable groove 221 of the middle ejector plate 22, and has a groove 211 with the same diameter as the limiting groove. The support pin 212 and the spring 213 are disposed within the groove 211. The support pin 212 has a vertically extending support column and an abutment connected to the upper end of the support column. The diameter of the abutment is larger than the diameter of the support column. The spring 213 is sleeved around the support column, and its two ends abut against the lower surface of the abutment and the bottom wall of the groove 211, respectively. The diameter of the groove 211 is the same as the diameter of the limiting groove, ensuring that the support pin 212 within the groove 211 can provide sufficient support force for the submerged ejector pin 60. If the groove is too large, it is prone to misalignment; if it is too small, the support force provided is insufficient.

[0035] The bottom wall of the groove 211 is provided with a relief groove with a diameter smaller than that of the groove 211. The lower end of the support column passes through the relief groove and extends downward out of the lower surface of the lower ejector plate 21.

[0036] Please see Figure 3 and Figure 5 The lower surface of the rear template 30 is provided with several limiting posts 225, which are arranged at intervals. When the mold is opened, the upper ejector plate 23 abuts against the limiting posts. Furthermore, the upper ejector plate 23 is provided with a second fixing groove, and the limiting posts 225 are fixed to the upper surface of the upper ejector plate 23 by fixing bolts, with the lower end of the fixing bolts fixed in the second fixing groove.

[0037] The rear template 30 is equipped with an inclined top sleeve 80 corresponding to the inclined top rod 71. The limiting post is a limiting screw. The limiting screw is threadedly connected to the rear template 30 and the nut of the limiting screw abuts against the lower surface of the inclined top sleeve 80 to fix the inclined top sleeve 80 to the rear template 30. The nut does not interfere with the inclined top rod 71.

[0038] The ejection mechanism further includes a mold core 40, which is mounted on the rear template 30. The mold core 40 has a first through hole, a second through hole, and a third through hole for accommodating the straight ejector pin 50, the angled ejector pin 72, and the submerged ejector pin 60. The upper ends of the straight ejector pin 50 and the submerged ejector pin 60 pass through the first through hole and the second through hole, respectively, and extend upwards out of the upper surface of the mold core 40. The submerged ejector pin's nozzle is located above the mold core 40.

[0039] Please see 1- Figure 3 This utility model also discloses an injection mold, including the ejection mechanism, the injection mold further including a front fixed plate and a front template mounted on the front fixed plate. When the mold is closed, the front template and the rear template 30 approach each other and form a mold cavity for molding the product.

[0040] The ejection mechanism and injection mold provided by this utility model allow the product's submerged piece to detach from the submerged piece opening of the submerged piece ejector pin 60 when the straight ejector pin 50 ejects the product upward and the submerged piece ejector pin 60 stops moving upward. This not only has a simple structure, but also allows the submerged piece to detach from the submerged piece opening and finally eject the product by means of the height difference between the straight ejector pin 50 and the submerged piece ejector pin 60, making product demolding very convenient.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An ejection mechanism, comprising a rear fixing plate, a rear template located above the rear fixing plate, and an ejector plate movably disposed between the rear fixing plate and the rear template, characterized in that, The ejector plate includes an upper ejector plate, a middle ejector plate, and a lower ejector plate stacked sequentially from top to bottom. A straight ejector pin is mounted on the upper ejector plate, with its lower end abutting against the middle ejector plate. A sleeve is movably mounted through the upper and middle ejector plates, extending upwards from the upper ejector plate. A submerged ejector pin, moving synchronously with the sleeve, is installed inside the sleeve. The upper end of the submerged ejector pin extends upwards beyond the rear template and has a submerged ejector nozzle. A support pin is movably mounted below the submerged ejector pin on the lower ejector plate, abutting against the submerged ejector pin. A spring is provided between the support pin and the lower ejector plate. A slanted ejector mechanism is mounted on the lower ejector plate. The slanted ejector mechanism includes a slanted ejector rod and a slanted ejector pin movably connected to the slanted ejector rod. The slanted ejector rod is mounted on the lower ejector plate and extends upwards into the rear template. The slanted ejector pin is movably mounted on the rear template and extends upwards beyond the rear template. When the ejection mechanism changes from the mold-closed state to the mold-open state, the upper ejector plate, the middle ejector plate, and the lower ejector plate move upward synchronously, driving the straight ejector pin, the angled ejector pin, and the submerged ejector pin to push the product upward until the upper surface of the sleeve hits the rear mold plate. The submerged ejector pin stops moving upward, while the straight ejector pin and the angled ejector pin continue to move upward. The submerged structure of the product disengages from the submerged ejector gate, completing the demolding of the product.

2. The ejection mechanism as described in claim 1, characterized in that, The upper ejector plate is provided with a first fixing groove for installing the straight ejector pin, and the lower end of the straight ejector pin is fixed in the first fixing groove.

3. The ejection mechanism as described in claim 1, characterized in that, The middle ejector plate and the upper ejector plate are provided with a movable groove for mounting the sleeve. The movable groove includes an upward sliding groove, and the lower end of the sliding groove is connected to a downward limiting groove. The diameter of the limiting groove is larger than the diameter of the sliding groove. The sleeve has a cylindrical sliding part and a cylindrical limiting part connected to the lower end of the sliding part. The diameter of the limiting part is larger than the diameter of the sliding part. The sliding part is slidably disposed in the sliding groove, and the limiting part is slidably disposed in the limiting groove.

4. The ejection mechanism as described in claim 3, characterized in that, The submersible ejector pin has a vertically extending body portion and an abutment portion connected to the lower end of the body portion. The diameter of the abutment portion is larger than the diameter of the body portion. The body portion of the submersible ejector pin penetrates the sleeve, and the abutment portion is located inside the limiting portion and moves synchronously with the limiting portion. The submersible ejector pin opening is located at the upper end of the body portion.

5. The ejection mechanism as described in claim 4, characterized in that, The lower ejector plate is recessed below the movable groove of the middle ejector plate, and the diameter of the groove is the same as the diameter of the limiting groove. The support pin and the spring are disposed in the groove. The support pin has a vertically extending support column and an abutment connected to the upper end of the support column. The diameter of the abutment is larger than the diameter of the support column. The spring is sleeved around the support column and its two ends abut against the lower surface of the abutment and the bottom wall of the groove, respectively.

6. The ejection mechanism as described in claim 5, characterized in that, The bottom wall of the groove is provided with a clearance groove with a diameter smaller than that of the groove, and the lower end of the support column passes through the clearance groove and extends downward out of the lower surface of the lower ejector plate.

7. The ejection mechanism as described in claim 1, characterized in that, The lower surface of the rear template is provided with several limiting posts, which are arranged at intervals. When the mold is opened, the upper ejector plate abuts against the limiting posts.

8. The ejection mechanism as described in claim 7, characterized in that, The rear template is fitted with an inclined top sleeve corresponding to the inclined top rod. The limiting post is a limiting screw. The limiting screw is threaded onto the rear template and the nut of the limiting screw abuts against the lower surface of the inclined top sleeve to fix the inclined top sleeve onto the rear template. The nut does not interfere with the inclined top rod.

9. The ejection mechanism as described in claim 1, characterized in that, The ejection mechanism also includes a mold core, which is installed on the rear template. The mold core has a first through hole, a second through hole, and a third through hole for accommodating the straight ejector pin, the angled ejector pin, and the submerged ejector pin.

10. An injection mold, comprising an ejection mechanism as described in any one of claims 1-9, characterized in that, The injection mold also includes a front fixing plate and a front template mounted on the front fixing plate. When the mold is closed, the front template and the rear template move closer to each other and form a mold cavity for molding the product.

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