Plastic box body forming structure
By combining core-pulling inserts and inner positioning parts, and adopting a method of shrinking the product before opening the mold, the problem of line clamping during the demolding process of plastic boxes is solved, improving the product's aesthetics and quality, while simplifying the mold structure and reducing costs.
Patent Information
- Application Number
- CN202422893074.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-11-26
AI Technical Summary
In existing technologies, plastic box products are prone to developing embedded lines during the demolding process, which affects the aesthetics and damages the texture, leading to a decline in product quality.
The production process involves first pulling out the core-pulling insert, leaving gaps on all four sides, and then using the product's subsequent shrinkage before opening the mold. This avoids the use of a four-sided sliding demolding structure. The cooperation between the core-pulling insert and the inner sliding parts ensures that the product is not damaged.
It solved the problem of line clamping, improved the product's aesthetics, avoided damage to the textured surface, simplified the mold structure, and saved costs.
Smart Images
Figure CN223685918U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of plastic product production, specifically, relate to plastic box body forming structure. BACKGROUND
[0002] In the production of plastic box products, when the four sides of the plastic box body product are straight and textured, the conventional demolding method is to use four-side row demolding structure.
[0003] However, the forming cavity in this four-side row demolding structure is formed by four mold bodies, but the gap between the adjacent mold bodies will produce line clamping on the appearance of the plastic box body product, greatly affecting the appearance of the plastic box body product. The row position is easy to damage the textured surface of the plastic box body product during demolding, reducing the quality of the plastic box body product. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing plastic box body forming structure, aiming at solving the problem that the plastic box body product is easy to appear line clamping in the process of demolding in the prior art.
[0005] The utility model is realized in this way, plastic box body forming structure, including front mold body and rear mold body and core pulling insert, the rear mold body has the inner mold cavity with the top opening, the front mold body is installed on the top of the rear mold body, so that the front mold body is blocked on the top opening of the inner mold cavity, along the top of the front mold body from top to bottom, one end of the core pulling insert penetrates the front mold body and is inserted in the inner mold cavity, the outer periphery of the core pulling insert and the inner side wall of the inner mold cavity and the front mold body are surrounded and form the forming cavity of the plastic box body injection molding.
[0006] The plastic box body has a box cavity with an external opening, and one end of the core pulling insert is inserted into the box cavity.
[0007] Further, the core pulling insert has an injection flow channel for injecting plastic liquid, the injection flow channel is arranged along the axial direction of the core pulling insert, and the injection flow channel is in communication with the forming cavity.
[0008] Further, the core pulling insert comprises a connecting piece and a core piece, one end of the core piece is connected with the connecting piece, the other end of the core piece penetrates the front mold body and is inserted into the inner mold cavity, and the connecting piece is exposed outside the front mold body.
[0009] Further, a plurality of inner row position pieces are arranged on the outer periphery of the core piece, and the inner row position pieces are located in the inner mold cavity.
[0010] The outer periphery of the core piece, the outer side wall of the inner row position piece and the inner side wall of the inner mold cavity and the front mold body are surrounded to form the forming cavity.
[0011] Further, a plurality of the inner row position members are arranged in a circumferential direction along an outer periphery of the insert core member, the insert core member is in sliding fit with the inner row position members, and the inner row position members are arranged in an extending direction along a length of the insert core member.
[0012] Further, the insert core member is recessed inward to form a sliding groove, the sliding groove is arranged in an inclined manner, and the insert core member is in sliding fit with the inner row position members through the sliding groove.
[0013] Further, the sliding groove is provided with an insertion strip, the inner row position member is recessed inward to form an insertion groove corresponding to the insertion strip, and the sliding groove is in sliding fit with the inner row position member through the insertion strip and the insertion groove.
[0014] Further, a top of the inner row position member is provided with an insert piece protruding upward, the insert piece is exposed outside the rear mold body, and the insert piece is embedded on the top of the front mold body.
[0015] Further, the rear mold body is provided with a fixing plate, the front mold body is embedded in the fixing plate, a core-pulling movable plate is installed on the fixing plate, the other end of the core-pulling insert piece is embedded in the core-pulling movable plate, a sprue plate is installed on the core-pulling movable plate, a nipple piece for injecting glue is arranged on the sprue plate, and the nipple piece is in communication with an injection runner.
[0016] Further, the core-pulling movable plate and the fixing plate are matched through a stroke adjusting mechanism, and the stroke adjusting mechanism is arranged on the outer side of the core-pulling movable plate and the fixing plate.
[0017] Compared with the prior art, the plastic box body forming structure provided by the utility model is produced in a mode that the core-pulling insert piece is first pulled out, gaps are left on four sides, and then the product is retracted to open the mold, so that the four-side row position demolding structure is not needed, the line clamping on the appearance surface of the plastic box product is avoided, the product is more beautiful, the contact between the row position and the product texture surface is avoided, the product texture surface is not damaged, the market competitiveness of the product is improved, the mold structure is simplified, the mold cost is saved, and the problem that the plastic box product is easily clamped in the demolding process is solved. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a three-dimensional schematic view of the plastic box body forming structure provided by the utility model;
[0019] Figure 2 is a sectional structure schematic view of the plastic box body forming structure provided by the utility model;
[0020] Figure 3 is a three-dimensional schematic view of the core-pulling insert piece, the inner row position member and the rear mold body provided by the utility model;
[0021] Figure 4 is a three-dimensional schematic view of the rear mold body.
[0022] In the figure: water gap plate 10, core-pulling movable plate 20, fixed plate 30, rear mold body 40, stroke adjusting mechanism 50, forming mold cavity 60, spout piece 70, core-pulling insert 21, injection molding runner 22, connecting piece 211, insert core piece 212, inner row position piece 213, sliding groove 214, plug 215, plug groove 216, inlay piece 217, front mold body 31, inner mold cavity 41. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.
[0024] The implementation of the utility model will be described in detail below in combination with specific examples.
[0025] The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the utility model, it should be understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the utility model, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.
[0026] Referring to Figures 1-4 , a preferred embodiment provided by the utility model.
[0027] The plastic box body forming structure comprises a front mold body 31 and a rear mold body 40 and a core-pulling insert 21, the rear mold body 40 has an inner mold cavity 41 with a top opening, the front mold body 31 is installed on the top of the rear mold body 40, so that the front mold body 31 blocks the top opening of the inner mold cavity 41, along the top of the front mold body 31 from top to bottom, one end of the core-pulling insert 21 penetrates through the front mold body 31 and is inserted into the inner mold cavity 41, and a forming mold cavity 60 for injection molding of the plastic box body is formed between the outer periphery of the core-pulling insert 21 and the inner side wall of the inner mold cavity 41 and the front mold body 31;
[0028] The plastic box body has a box cavity with an external opening, and one end of the core-pulling insert 21 is inserted into the box cavity.
[0029] The provided plastic box forming structure is produced by first extracting the core insert 21, leaving gaps on four sides, and then opening the mold again by using product shrinkage, which does not need to use four-side parting demolding structure, thereby avoiding the appearance of plastic box products on the surface of the line, making the product more beautiful, avoiding the contact between the parting and the product surface, and ensuring that the product surface is not damaged; improving the competitiveness of the product in the market, simplifying the mold structure, saving the mold cost; and solving the problem of easy line clamping of the plastic box product during demolding.
[0030] In the embodiment, the core insert 21 has an injection flow channel 22 for injecting plastic liquid, the injection flow channel 22 is arranged along the axial direction of the core insert 21, and the injection flow channel 22 is in communication with the forming mold cavity 60. In this way, the injection nozzle of the injection machine can inject the plastic liquid into the forming mold cavity 60 through the injection flow channel 22, so that the water gap is hidden in the box cavity of the plastic box body.
[0031] In the embodiment, the core insert 21 includes a connecting piece 211 and a core piece 212, one end of the core piece 212 is connected with the connecting piece 211, the other end of the core piece 212 penetrates the front mold body 31 and is inserted into the inner mold cavity 41, and the connecting piece 211 is exposed outside the front mold body 31.
[0032] The core insert 21 is inserted into the inner mold cavity 41 through the core piece 212, the core piece 212 extends outside the inner mold cavity 41 through the connecting piece 211, and the core piece 212 can be extracted from the inner mold cavity 41 through the connecting piece 211.
[0033] In the embodiment, a plurality of inner parting pieces 213 are arranged on the outer periphery of the core piece 212, and the inner parting pieces 213 are located in the inner mold cavity 41.
[0034] The outer periphery of the core piece 212 and the outer side wall of the inner parting piece 213 and the inner side wall of the inner mold cavity 41 and the front mold body 31 form the forming mold cavity 60.
[0035] When the plastic box product is formed in the forming mold cavity 60, the core piece 212 is extracted from the plastic box body, and the core piece 212 is displaced inwardly by the plurality of inner parting pieces 213, so that the plastic box product has a shrinkage space, and the surface of the plastic box product is not damaged.
[0036] The plurality of inner parting pieces 213 are arranged along the outer periphery of the core piece 212 in a circumferential direction, the core piece 212 is in sliding cooperation with the inner parting piece 213, and the inner parting piece 213 extends along the length direction of the core piece 212.
[0037] In the embodiment, the insert core 212 is recessed inward to form a sliding groove 214, the sliding groove 214 is arranged obliquely, and the insert core 212 is slidably connected with the inner row position piece 213 through the sliding groove 214. In this way, during the process of pulling out the plastic box body, the plurality of inner row position pieces 213 can automatically displace inward in cooperation with the sliding groove 214, so that the plastic box body product has a shrinkage space, and the surface of the plastic box body product is not damaged.
[0038] In the embodiment, the sliding groove 214 is provided with an insertion strip 215, the inner row position piece 213 is recessed inward to form an insertion groove 216 corresponding to the insertion strip 215, and the sliding groove 214 and the inner row position piece 213 are slidably connected through the insertion strip 215 and the insertion groove 216.
[0039] The sliding groove 214 is slidably connected with the insertion groove 216 on the inner row position piece 213 through the insertion strip 215, so that the plurality of inner row position pieces 213 will not swing randomly during the process of pulling out the plastic box body, and the insert core 212 can be smoothly pulled out without damaging the plastic box body.
[0040] In the embodiment, the top of the inner row position piece 213 is provided with an inlay piece 217 protruding upward, the inlay piece 217 is exposed outside the rear mold body 40, and the inlay piece 217 is embedded on the top of the front mold body 31. In this way, the inner row position piece 213 can be pulled out of the inner mold cavity 41 together with the plastic box body through the inlay piece 217, and the demolding work of the product is completed.
[0041] In the embodiment, the rear mold body 40 is provided with a fixed plate 30, the front mold body 31 is embedded in the fixed plate 30, the fixed plate 30 is provided with a core-pulling movable plate 20, the other end of the core-pulling insert 21 is embedded in the core-pulling movable plate 20, the core-pulling movable plate 20 is provided with a sprue plate 10, the sprue plate 10 is provided with a nipple 70 for injecting plastic liquid, and the nipple 70 is in communication with the injection flow channel 22. In this way, the injection machine nozzle can inject plastic liquid from the outside into the injection flow channel 22 through the nipple 70.
[0042] The core pulling insert 21 is fixed on the core pulling movable plate 20, when the mold is opened, the nozzle plate 10 is opened first, then the core pulling movable plate 20 is opened, after the two actions are completed, the nozzle and the injection machine nozzle have been separated, and the core pulling insert 21 is pulled out from the core pulling movable plate 20, then the core pulling movable plate 20 and the fixed plate 30 are opened, because the core pulling insert 21 is fixed on the core pulling movable plate 20, the core pulling insert 21 is slowly pulled out from the box cavity of the plastic box body, the pulling-out distance can be controlled by the stroke adjusting mechanism 50, after the core pulling movable plate 20 and the fixed plate 30 are opened, the injection machine needs to be controlled to stay for about 10 seconds, so that the plastic box body product has a post-shrinkage time, then the fixed plate 30 and the rear mold body 40 are opened, the core pulling insert 21 takes the plastic box body product out of the rear mold body 40, in this process, because the plastic box body product has a post-shrinkage, the process of taking out from the rear mold body 40 will not damage the surface.
[0043] The core pulling insert 21 is suggested to be left in the box cavity of the plastic box body for about 10 mm, too much plastic box body is difficult to take, too little is not enough to take the plastic box body out of the rear mold body 40, the specific stroke can be adjusted by the stroke adjusting mechanism 50 according to the actual situation; the post-shrinkage time of the injection machine needs to be increased or decreased according to the product feature shape, size and sample appearance, and there is no fixed value.
[0044] In the embodiment, the core pulling movable plate 20 and the fixed plate 30 are matched by the stroke adjusting mechanism 50, and the stroke adjusting mechanism 50 is arranged on the outer side of the core pulling movable plate 20 and the fixed plate 30. In this way, the distance that the core pulling movable plate 20 drives the core pulling insert 21 to separate from the plastic box body can be controlled and limited by the stroke adjusting mechanism 50, so that the plastic box body has a post-shrinkage time.
[0045] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A plastic box body forming structure, characterized by, The core-pulling insert is inserted into the inner mold cavity through the front mold body and has one end exposed outside the front mold body. The core-pulling insert has an injection flow channel for injecting plastic liquid, which is arranged through the core-pulling insert along the axial direction and is in communication with the molding mold cavity.
2. The plastic box forming structure according to claim 1, wherein The core-pulling insert includes a connecting piece and a core piece, one end of the core piece is connected with the connecting piece, the other end of the core piece is inserted into the inner mold cavity through the front mold body, and the connecting piece is exposed outside the front mold body.
3. The plastic box forming structure according to claim 1, wherein The core piece is provided with a plurality of inner row pieces on the outer periphery thereof, and the inner row pieces are located in the inner mold cavity.
4. The plastic box forming structure according to claim 3, wherein The core piece and the inner row pieces are in sliding fit with each other, and the inner row pieces extend along the length direction of the core piece. The core piece is recessed inwardly to form a sliding groove, and the sliding groove is arranged in an inclined manner.
5. The plastic box forming structure according to claim 4, wherein The sliding groove is provided with an insertion strip, and the inner row piece is recessed inwardly to form an insertion slot corresponding to the insertion strip.
6. The plastic box forming structure according to claim 5, wherein The top of the inner row piece is provided with an inlay piece, the inlay piece is exposed outside the rear mold body, and the inlay piece is embedded on the top of the front mold body.
7. The plastic box forming structure according to claim 6, wherein The rear mold body is provided with a fixed plate, the front mold body is embedded in the fixed plate, a core-pulling movable plate is installed on the fixed plate, the other end of the core-pulling insert is embedded in the core-pulling movable plate, a nozzle plate is installed on the core-pulling movable plate, a nozzle piece for injecting plastic liquid is arranged on the nozzle plate, and the nozzle piece is in communication with the injection flow channel.
8. The plastic box forming structure according to claim 7, wherein The core-pulling movable plate and the fixed plate are matched by a stroke adjusting mechanism, and the stroke adjusting mechanism is arranged on the outer side of the core-pulling movable plate and the fixed plate.
9. The plastic box forming structure according to claim 2, wherein 10. The plastic box forming structure according to claim 9, wherein