Ejection mechanism and injection mold
By designing a simplified ejection mechanism, the release of the latent piece structure is achieved by using the height difference between the straight thimble and the latent piece thimble, which solves the problems of complex structure and high cost of the existing mold, and achieves a simple latent piece mold release effect.
Patent Information
- Application Number
- CN202422236561.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-11
AI Technical Summary
The existing injection molds with secondary ejection structures have complex structures, large space and high production costs, making it difficult to effectively detach from the latent sheet structure.
An ejection mechanism is designed, including components such as upper plate, lower plate, straight thimble, latent sheet thimble and spring. The movement height difference between the straight thimble and latent sheet thimble is achieved to disengage the latent sheet rubber position, simplifying the structure and reducing space occupation.
It realizes simple mold release of the latent sheet structure, reduces the complexity and production cost of the mold, and improves production efficiency.
Smart Images
Figure CN223161297U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of molds, in particular to an ejection mechanism and an injection mold. Background Art
[0002] The structures of injection products are becoming more and more diversified. Therefore, the corresponding injection mold structures are also designed diversely to meet the structural requirements of injection products.
[0003] Nowadays, there are more and more injection products with sub - marine structure. The existing injection molds generally adopt a secondary ejection structure design. Among them, the existing secondary ejection mechanism generally includes an ejection structure with a relatively independent first stroke and an ejection structure with a second stroke. When the ejection structure of the first stroke is completed, the ejection mechanism of the second stroke is started to realize the demolding of the sub - marine structure. However, the existing secondary ejection structure not only has a complex structure, occupies a large space, but also has a high manufacturing cost, which brings great troubles to the practitioners of injection molds. Summary of the Utility Model
[0004] In view of this, the purpose of the utility model is to provide an ejection mechanism and an injection mold with a simple structure and convenient for the sub - marine structure to be separated.
[0005] To achieve the above purpose, the utility model provides an ejection mechanism, which includes a rear fixed plate, a rear template located above the rear fixed plate, and an ejector plate movably arranged between the rear fixed plate and the rear template. The ejector plate includes an upper plate and a lower plate arranged in a stacked manner. A straight ejector pin fixedly installed and a sleeve movably installed are arranged on the upper plate. The sleeve can extend upward out of the upper plate. A sub - marine ejector pin moving synchronously with the sleeve is installed in the sleeve. The straight ejector pin and the sub - marine ejector pin pass through the rear template, and the upper ends of the straight ejector pin and the sub - marine ejector pin extend upward out of the rear template. A sub - marine gate is arranged at the upper end of the sub - marine ejector pin, and the sub - marine gate is located above the rear template. A support pin for abutting against the sub - marine ejector pin is movably arranged below the lower plate and located below the sub - marine ejector pin. A spring is arranged between the support pin and the lower plate.
[0006] When the ejection mechanism changes from the mold - closing state to the mold - opening state, the upper plate and the lower plate move upward to drive the straight ejector pin and the sub - marine ejector pin to abut against the product upward until the upper surface of the sleeve abuts against the rear template, and the sub - marine ejector pin stops moving upward. The straight ejector pin continues to move upward, and the sub - marine structure of the product is separated from the sub - marine gate, completing the demolding of the product.
[0007] Furthermore, the upper plate is provided with a first fixing groove, and the lower end of the straight ejector pin is fixed in the first fixing groove.
[0008] Further, the upper plate is provided with 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 cylindrical sliding portion and a cylindrical limiting portion connected to the lower end of the sliding portion. The diameter of the limiting portion is larger than that of the sliding portion. The sliding portion is slidably arranged in the sliding groove, and the limiting portion is slidably arranged in the limiting groove.
[0009] Further, the sub-plate ejector pin has a body portion and an abutting portion connected to the lower end of the body portion. The diameter of the abutting portion is larger than that of the body portion. The body portion of the sub-plate ejector pin penetrates through the sleeve, and the upper surface of the abutting portion abuts against the lower surface of the limiting portion. The sub-plate glue port is located at the upper end of the body portion.
[0010] Further, the lower plate is recessed with a groove. The support pin and the spring are arranged in the groove. The support pin has a support column and an abutting top connected to the upper end of the support column. The diameter of the abutting top is larger than that of the support column. The spring is sleeved around the support column, and its two ends respectively abut against the lower surface of the abutting top and the bottom wall of the groove.
[0011] Further, a relief groove with a diameter smaller than that of the groove is penetrated downward through the bottom wall of the groove. The lower end of the support column passes through the relief groove and extends downward out of the lower surface of the lower plate.
[0012] Further, the upper surface of the upper plate is provided with a limiting post, which is used to limit the minimum distance between the rear template and the upper plate.
[0013] Further, the upper plate is provided with a second fixing groove. The limiting post is fixed on the upper surface of the upper plate through a fixing bolt, and the lower end of the fixing bolt is fixed in the second fixing groove.
[0014] Further, the ejection mechanism further includes a mold core, which is installed on the rear template. The mold core is provided with a first through hole and a second through hole for accommodating the straight ejector pin and the sub-plate ejector pin.
[0015] The present utility model also discloses an injection mold, including the above-mentioned ejection mechanism. The injection mold further includes a front fixing plate and a front template installed on the front fixing plate. When the mold is closed, the front template and the rear template approach each other and enclose a mold cavity for molding the product.
[0016] The ejector mechanism and injection mold provided by the present utility model are such that when the straight ejector pin ejects the product upward and the submarine ejector pin stops moving upward, the submarine glue position of the product disengages from the submarine glue port of the submarine ejector pin. It not only has a simple structure, but also can achieve the disengagement of the submarine glue position from the submarine glue port and finally eject the product through the height difference of the movement of the straight ejector pin and the submarine ejector pin, making the demolding of the product very convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.
[0018] Figure 1 It is a perspective view of an ejector mechanism of the present utility model.
[0019] Figure 2 It is Figure 1 a perspective view of a partial mechanism of the ejector mechanism shown.
[0020] Figure 3 It is Figure 2 a perspective exploded view of the ejector mechanism shown.
[0021] Figure 4 It is an exploded schematic view of the lower plate of the present utility model.
[0022] Figure 5 It is a perspective view of the mold core of the present utility model.
[0023] Figure 6 It is a schematic view of the mold closing state of the ejector mechanism of the present utility model.
[0024] Figure 7 It is Figure 6 a schematic view of the ejector plate of the ejector mechanism shown.
[0025] Figure 8 It is Figure 7 a partial enlarged view at position B of the ejector plate shown.
[0026] Fig. 9 It is a schematic view of the ejector mechanism of the present utility model changing from the mold closing state to the mold opening state.
[0027] Fig.10 Fig. 9 a partial enlarged view at position A of the ejector mechanism shown.
[0028] Figure 11This is a schematic diagram of the mold opening state of the ejection mechanism of the present utility model. Specific embodiments
[0029] The following will describe in detail specific embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the description of the present invention without creative efforts shall fall within the scope of protection of the present invention.
[0030] The terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. They are only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.
[0031] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the listed elements, it may also include other elements not specifically listed.
[0032] Please refer to Figures 1-11 , the present utility model discloses an ejection mechanism, including a rear fixed plate 10, a rear template 30 located above the rear fixed plate 10, and an ejector pin plate 20 movably arranged between the rear fixed plate 10 and the rear template 30. The ejector pin plate 20 includes an upper plate 22 and a lower plate 21 arranged in a stacked manner. A straight ejector pin 50 fixedly installed and a sleeve 224 movably installed are provided on the upper plate 22. The sleeve 224 can extend upward from the upper plate 22. A submerged ejector pin 60 that moves synchronously with the sleeve 224 is installed in the sleeve 224. The straight ejector pin 50 and the submerged ejector pin 60 pass through the rear template 30, and the upper ends of the straight ejector pin 50 and the submerged ejector pin 60 extend upward from the rear template 30. A submerged gate 63 is provided at the upper end of the submerged ejector pin 60, and the submerged gate 63 is located above the rear template 30. A support pin 212 that abuts against the submerged ejector pin 60 is movably arranged below the submerged ejector pin 60 on the lower plate 21. A spring 213 is arranged between the support pin 212 and the lower plate 21.
[0033] When the ejection mechanism changes from the mold closing state to the mold opening state, the upper plate 22 and the lower plate 21 move upward to drive the straight ejector pin 50 and the submerged ejector pin 60 to abut against the product upward until the upper end of the sleeve 224 abuts against the rear template 30, and the submerged ejector pin 60 stops moving upward. As the straight ejector pin 50 continues to move upward, the submerged structure of the product disengages from the submerged gate 63, completing the demolding of the product.
[0034] Please refer to Figure 2 and Figure 3 wherein the upper plate 22 is provided with a first fixing groove 221 for mounting the direct ejector pin 50, and the lower end of the direct ejector pin 50 is fixed in the first fixing groove 221. More specifically, the first fixing groove 221 includes a receiving groove penetrating upward, and a fixing groove is communicated with the lower end of the receiving groove. The diameter of the fixing groove is larger than that of the receiving groove. The direct ejector pin includes a vertically extending needle body and a fixing portion located at the lower end of the needle body. The diameter of the fixing portion is larger than that of the needle body. The needle body is located in the receiving groove, and the fixing portion is fixed in the fixing groove. When the upper plate 22 moves up and down, the direct ejector pin 50 moves synchronously with the upper plate 22.
[0035] Please refer to Figure 2 、 Figure 3 、 Fig. 9 and Fig.10 wherein the upper plate 22 is provided with a movable groove 222 for mounting the sub-surface ejector pin 60. The movable groove 222 includes a sliding groove 2221 penetrating upward, and a limiting groove 2222 penetrating downward is communicated with the lower end of the sliding groove 2221. The diameter of the limiting groove 2222 is larger than that of the sliding groove 2221. The sleeve 224 has a cylindrical sliding portion 2241 and a cylindrical limiting portion 2242 connected to the lower end of the sliding portion 2241. The diameter of the limiting portion 2242 is larger than that of the sliding portion 2241. The sliding portion 2241 is slidably disposed in the sliding groove 2221, and the limiting portion 2242 is slidably disposed in the limiting groove 2222.
[0036] Please refer to Figure 3 、 Fig. 9 and Fig.10 wherein the sub-surface ejector pin 60 has a vertically extending body portion 61 and an abutting portion 62 connected to the lower end of the body portion 61. The diameter of the abutting portion 62 is larger than that of the body portion 61. The body portion 61 of the sub-surface ejector pin 60 penetrates through the sleeve 224, and the upper surface of the abutting portion 62 abuts against the lower surface of the limiting portion 2242. The sub-surface glue port 63 is located at the upper end of the body portion 61.
[0037] Please refer to Figure 4 、 Fig. 9 and Fig.10, a groove 211 is recessed downward below the movable slot 222 of the upper plate 22 on the lower plate 21. The support pin 212 and the spring 213 are arranged in the groove 211. The support pin 212 has a support column 2122 extending vertically and a top abutting portion 2121 connecting the upper end of the support column 2122. The diameter of the top abutting portion 2121 is larger than that of the support column 2122. The spring 213 is sleeved around the support column 2122, and its two ends respectively abut against the lower surface of the top abutting portion 2121 and the bottom wall of the groove 211.
[0038] Please continue to refer to Figure 6-Figure 8 , an avoidance slot 2111 with a diameter smaller than that of the groove 211 is provided through the bottom wall of the groove 211 downward. The lower end of the support column 2122 passes through the avoidance slot 2111 and extends downward out of the lower surface of the lower plate 21.
[0039] Please refer to Figure 3 、 Fig. 9 and Fig.10 , a limit post 225 is arranged on the upper surface of the upper plate 22. The limit post 225 is used to limit the minimum distance between the rear template 30 and the upper plate 22. Further, the upper plate 22 is provided with a second fixing groove 223. The limit post 225 is fixed on the upper surface of the upper plate 22 through a fixing bolt 226, and the lower end of the fixing bolt 226 is fixed in the second fixing groove 223.
[0040] Please refer to Figure 1 、 Figure 5 and Figure 6 , the ejection mechanism further includes a mold core 40. The mold core 40 is installed on the rear template 30. The mold core 40 is provided with a first through hole 41 and a second through hole 42 for accommodating the straight ejector pin 50 and the submarine ejector pin 60. The upper ends of the straight ejector pin 50 and the submarine ejector pin 60 respectively penetrate through the first through hole 41 and the second through hole 42 and extend upward out of the upper surface of the mold core 40, and the submarine gate 63 is located above the mold core 40.
[0041] Please refer to Figure 6, when the present utility model is in the mold clamping state, the ejector plate 20 is reset. The spring 213 located on the lower plate 21 pushes the support pin 212 upward under the action of elastic force to abut against the sub - ejector pin 60 and makes the sleeve 224 extend upward out of the upper plate 22. At this time, the distance between the lower surface of the sleeve 224 and the upper surface of the lower plate 21 is S3, and the distances from the upper edges of the straight ejector pin 50 and the sub - ejector pin 60 to the upper surface of the mold core 40 are S. In this embodiment, only the case where the upper edges of the straight ejector pin 50 and the sub - ejector pin 60 are flush in the mold clamping state is described, and it is not limited that the upper edges of the straight ejector pin 50 and the sub - ejector pin 60 are flush. In other embodiments, the upper edges of the straight ejector pin 50 and the sub - ejector pin 60 are subject to the internal structure of the specific product. The upper edge of the straight ejector pin 50 can be higher than the upper edge of the sub - ejector pin 60, and the upper edge of the straight ejector pin 50 can also be lower than the upper edge of the sub - ejector pin 60, which is not specifically limited herein.
[0042] Please refer to Fig. 9 and Figure 11 , when the product needs to be ejected after injection molding, the present utility model changes from the mold clamping state to the mold opening state, which includes two stages:
[0043] In the first stage, the upper plate 22 and the lower plate 21 move upward simultaneously and drive the straight ejector pin 50 and the sub - ejector pin 60 to move upward to abut against the product. At this time, the sub - ejector pin 60 is displaced synchronously with the straight ejector pin 50 under the abutment of the support pin 212, and the upper edges of the straight ejector pin 50 and the sub - ejector pin 60 remain flush until the upper surface of the sleeve 224 abuts against the lower surface of the rear template 30. At this time, the distances from the upper edges of the straight ejector pin 50 and the sub - ejector pin 60 to the upper surface of the mold core 40 are S1, and S1 > S;
[0044] In the second stage, the upper plate 22 and the lower plate 21 continue to move upward synchronously, and the straight ejector 50 continues to move upward to press against the product under the drive of the upper plate 22 and the lower plate 21, and the latent sheet ejector 60 stops moving upward, that is, the latent sheet ejector 60 and the sleeve 224 move downward relative to the upper plate 22 and the lower plate 21 under the pressure of the rear template 30, until the upper surface of the positioning post 225 on the upper plate 22 presses against the lower surface of the rear template 30, the upper plate 22, the lower plate 21, the straight ejector 50 and the latent sheet ejector 60 all stop moving. At this time, the lower end of the sleeve 224 presses against the upper surface of the lower plate 21, and the upper end edge of the straight ejector 50 is higher than the upper end edge of the latent sheet ejector 60, and the height difference is the distance S3 of the downward movement of the sleeve 224 relative to the upper surface of the lower plate 21. At this time, the distance between the upper end of the straight ejector pin 50 and the upper surface of the mold core 40 is S2, and S2=S1+S3 is satisfied, that is, the distance between the upper end of the straight ejector pin 50 and the upper surface of the mold core 40 is equal to the sum of the distance between the upper end of the latent sheet ejector pin 60 and the upper surface of the mold core 40 and the distance that the sleeve 224 moves downward relative to the ejector plate 20.
[0045] Moreover, in the second stage, before the positioning column 225 abuts against the rear template 30, the straight ejector pin 50 moves upward, and when the latent sheet ejector pin 60 stops moving upward, the latent sheet structure of the product is separated from the latent sheet glue port 63, completing the demoulding of the product.
[0046] The utility model also discloses an injection mold, including the above-mentioned ejection mechanism, the injection mold also includes a front fixing plate and a front template installed on the front fixing plate, when the mold is closed, the front template and the rear template are close to each other and form a mold cavity for molding the product.
[0047] The ejection mechanism and injection mold provided by the utility model are such that when the straight ejector pin 50 ejects the product upward and the latent sheet ejector pin 60 stops moving upward, the latent sheet glue position of the product is separated from the latent sheet glue port 63 of the latent sheet ejector pin 60. This not only has a simple structure, but also the latent sheet glue position can be separated from the latent sheet glue port 63 and the product can be finally ejected through the moving height difference between the straight ejector pin 50 and the latent sheet ejector pin 60, making it very convenient to demold the product.
[0048] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.
Claims
1. An ejection mechanism, comprising a rear fixed plate, a rear template located above the rear fixed plate, and an ejector plate movably disposed between the rear fixed plate and the rear template, characterized in that, The ejector plate includes an upper plate and a lower plate which are stacked. A fixed ejector pin and a movable sleeve are provided on the upper plate. The sleeve can extend upward from the upper plate. A submarine ejector pin that moves synchronously with the sleeve is installed in the sleeve. The ejector pin and the submarine ejector pin pass through the rear template, and the upper ends of the ejector pin and the submarine ejector pin extend upward from the rear template. A submarine gate is provided at the upper end of the submarine ejector pin, and the submarine gate is located above the rear template. A support pin that abuts against the submarine ejector pin is movably provided below the submarine ejector pin on the lower plate. A spring is provided between the support pin and the lower plate. When the ejection mechanism changes from the mold closing state to the mold opening state, the upper plate and the lower plate move upward to drive the ejector pin and the submarine ejector pin to abut against the product upward until the upper surface of the sleeve abuts against the rear template. The submarine ejector pin stops moving upward, and the ejector pin continues to move upward. The submarine structure of the product disengages from the submarine gate, completing the demolding of the product.
2. The ejection mechanism according to claim 1, characterized in that, The upper plate is provided with a first fixing groove, and the lower end of the ejector pin is fixed in the first fixing groove.
3. The ejection mechanism according to claim 1, characterized in that, The upper plate is provided with a sliding groove that penetrates upward. The lower end of the sliding groove is communicated with a limiting groove that penetrates downward. The diameter of the limiting groove is larger than that 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 that of the sliding part. The sliding part can be slidably arranged in the sliding groove, and the limiting part can be slidably arranged in the limiting groove.
4. The ejection mechanism according to claim 3, wherein, The submarine ejector pin has a body part and an abutting part connected to 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 submarine ejector pin penetrates through the sleeve, and the upper surface of the abutting part abuts against the lower surface of the limiting part. The submarine gate is located at the upper end of the body part.
5. The ejection mechanism according to claim 1, wherein, The lower plate is recessed with a groove. The support pin and the spring are arranged in the groove. The support pin has a support column and an abutting top connected to the upper end of the support column. The diameter of the abutting top is larger than that of the support column. The spring is sleeved around the support column, and its two ends respectively abut against the lower surface of the abutting top and the bottom wall of the groove.
6. The ejection mechanism according to claim 5, wherein A relief groove with a diameter smaller than that of the groove penetrates downward through the bottom wall of the groove. The lower end of the support column passes through the relief groove and extends downward from the lower surface of the lower plate.
7. The ejection mechanism according to claim 1, characterized in that, Limit posts are provided on the upper surface of the upper plate, and the limit posts are used to define the minimum distance between the rear template and the upper plate.
8. The ejection mechanism according to claim 7, characterized in that, The upper plate is provided with a second fixing groove. The limit posts are fixed to the upper surface of the upper plate by fixing bolts, and the lower ends of the fixing bolts are fixed in the second fixing groove.
9. The ejection mechanism according to claim 1, characterized in that, The ejection mechanism further includes a mold core. The mold core is installed on the rear template. The mold core is provided with a first through hole and a second through hole for accommodating the ejector pin and the submarine ejector pin.
10. An injection mold, comprising an ejection mechanism according to any one of claims 1-9, characterized in that, The injection mold further 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 approach each other and enclose a mold cavity for molding the product.