Combined plastic storage drawer forming die

Abstract

This utility model provides a combined plastic storage drawer molding mold, belonging to the field of mold technology. It includes a top plate, an upper template, and a lower template. A main body molding cavity for the storage drawer is provided between the upper and lower templates. A molding platform is provided on the lower template. The molding platform has a recessed portion with horizontally penetrating left and right sides in its center. A rectangular molding insert is provided at the center of the recessed portion. The mold uses a drawer pull-out opening molding structure with an internal glue channel on the top of the molding insert of the lower template, and a side core-pulling mechanism to form a rectangular ring splicing plate, transferring the glue injection position to the inner side of the drawer pull-out opening, which is not an external surface. This design avoids glue marks on the outer surface of the product, while the side core-pulling mechanism can accurately form the rectangular ring structure required for splicing, solving the appearance defects caused by traditional glue injection methods and improving the surface quality and splicing adaptability of the product.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a combined plastic storage drawer molding mold. Background Technology

[0002] In the manufacturing of modular plastic storage drawers, the cabinet assembly body, as the core structural component, directly determines the drawer's aesthetic appearance, assembly stability, and overall lifespan through its molding quality. Currently, in the mainstream injection molding process for cabinet assembly bodies, the mold's glue injection mechanism generally adopts a design where glue is directly injected from the top of the molding cavity. While this injection method is structurally simple, it has significant technical drawbacks: when the glue is injected from the top of the molding cavity, it leaves obvious glue marks on the product's outer surface, and shrinkage marks, burrs, and other appearance defects are easily present near the glue mark, severely damaging the smoothness and aesthetics of the product's outer surface. These defects are particularly pronounced for light-colored or high-gloss storage drawer products, significantly reducing the product's market competitiveness. Meanwhile, since the glue outlet is located on the outer surface of the product, additional trimming and sanding processes are required to remove it. This not only increases labor costs and production cycle but may also damage the product surface due to improper trimming, further affecting product quality stability. Furthermore, with the top-direct glue injection method, the glue flows along a longer and uneven path within the molding cavity, easily leading to insufficient filling or air bubbles. This reduces the structural strength of the cabinet's main body, potentially causing loosening and deformation during long-term use, failing to meet consumer demands for the durability of storage drawers. These issues have become key bottlenecks restricting the upgrading of modular plastic storage drawer products and urgently require solutions through innovative mold structure design.

[0003] For example, a Chinese patent discloses a refrigerator drawer forming mold [application number: 202222595977.5], which includes a base with a supporting surface and a limiting surface perpendicular to the supporting surface on its top. The supporting surface is used to support the drawer, and the limiting surface abuts against the end face of the drawer used to form the handle. At least one hinge shaft is disposed on the top of the base and located behind the limiting surface. A flip slider is disposed above the base and is hinged to at least one hinge shaft. A model block is disposed on the side of the flip slider near the drawer and is used to form the handle of the drawer. A telescopic rod is located on the side of the flip slider away from the drawer and is hinged to the flip slider so as to drive the flip slider to flip using its own telescopic movement. Summary of the Invention

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a modular plastic storage drawer molding mold.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A modular plastic storage drawer molding mold includes a top plate, an upper template, and a lower template. A main body molding cavity for the storage drawer is provided between the upper and lower templates. A molding platform is provided on the lower template. The molding platform has a recessed portion with horizontally penetrating left and right sides in the middle. A molding insert with a rectangular cross-section is provided at the center of the recessed portion. The left and right sides of the molding insert have first side molding surfaces with their bottoms extending to the lower end face of the recessed portion. The front and rear sides of the molding insert have second side molding surfaces with their bottoms extending to the upper end face of the molding platform. The top of the molding insert has a top molding surface connected to the first and second side molding surfaces. The top molding surface is also provided with a drawer pull-out opening molding structure with an internal glue inlet channel. The left and right sides of the lower template are also provided with side core-pulling mechanisms for forming rectangular annular splicing plates on both sides of the main body of the storage drawer.

[0006] In the above-mentioned combined plastic storage drawer molding mold, the drawer pull-out forming structure includes a drawer pull-out forming block protruding from the top of the forming insert, and the cross-section of the drawer pull-out forming block is rectangular.

[0007] In the above-mentioned combined plastic storage drawer molding mold, the inner glue inlet channel structure includes an inner glue inlet channel recessed inward on the top surface of the drawer pull-out molding block, and the inner glue inlet channel is connected to the side of the top molding surface.

[0008] In the above-mentioned combined plastic storage drawer molding mold, there are at least two injection points between the inner glue channel and the top molding surface.

[0009] In the above-mentioned combined plastic storage drawer molding mold, the side core pulling mechanism includes side pull slides arranged on both sides of the molding platform. A side pull slider is slidably connected in the side pull slide. A side molding block is provided with a protruding side end of the side pull slider, which is inserted into the concave part and whose inner end face corresponds to the first side molding surface of the molding insert side. There is a gap between the side molding block and the first side molding surface.

[0010] In the above-mentioned combined plastic storage drawer molding mold, the outer edge of the inner end face of the side molding block is recessed inward and provided with a rectangular annular splicing plate molding groove with a rectangular cross section.

[0011] In the above-mentioned combined plastic storage drawer molding mold, the upper template is provided with an inclined core rod mounting groove for installing the core rod, and the side slide block is provided with a core rod driving groove corresponding to the core rod mounting groove. The lower end of the core rod installed in the core rod mounting groove is inserted into the core rod driving groove.

[0012] In the above-mentioned combined plastic storage drawer molding mold, two straight top blocks are embedded on the upper surface of the molding platform, which are located on the front and rear sides of the molding insert respectively. The upper surface of the straight top block is flush with the upper surface of the molding platform, and the inner side of the upper surface of the straight top block is connected to the bottom of the second side molding surface.

[0013] In the above-mentioned combined plastic storage drawer molding mold, a lifting plate is provided on the lower side of the lower template, and the bottom of the straight top block is connected to the lifting plate through two straight top rods.

[0014] In the above-mentioned combined plastic storage drawer molding mold, the bottom of the straight top block is provided with a countersunk hole corresponding to the straight top rod, the top of the straight top block is provided with a bolt mounting countersunk hole communicating with the countersunk hole, and the top of the straight top rod is provided with a threaded groove. The bottom end of the bolt installed in the bolt mounting countersunk hole can be screwed into the threaded groove at the top of the straight top rod to fix the straight top block and the straight top rod.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. The mold uses a drawer pull-out forming structure with an internal glue channel on the top of the forming insert of the lower mold plate, and a side core-pulling mechanism to form a rectangular ring splicing plate, thereby transferring the glue injection position to the inside of the drawer pull-out opening, which is not an external surface. This design avoids the formation of glue holes on the outer surface of the product. At the same time, the side core-pulling mechanism can accurately form the rectangular ring structure required for splicing, solving the appearance defects caused by traditional glue injection methods and improving the surface quality and splicing compatibility of the product.

[0016] 2. The internal glue inlet channel adopts a concave design on the top surface of the molding block and is connected to the side of the top molding surface. This allows the glue to be introduced into the molding cavity from the inside of the drawer pull-out opening, which is not visible. This channel structure shortens the glue flow path, reduces the glue flow resistance, and avoids defects such as bubbles and shrinkage marks generated during the glue flow process. At the same time, the glue inlet position is hidden on the non-visual surface, completely eliminating glue gate marks on the outer surface and further improving the integrity of the product appearance.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a partial structural diagram of the lower template when the main body of the storage drawer has not been demolded; Figure 4 This is a partial structural diagram of the lower template after the main body of the storage drawer has been demolded; Figure 5 This is a structural diagram of the direct-acting block; Figure 6 This is a schematic diagram of the side-pull slider structure. Detailed Implementation

[0019] like Figures 1-6 As shown, a combined plastic storage drawer molding mold includes a top plate 1, an upper template 2, and a lower template 3. A storage drawer body molding cavity 4 is provided between the upper template 2 and the lower template 3. A molding platform 5 is provided on the lower template 3. The molding platform 5 has a recessed portion 6 that horizontally penetrates the molding platform 5 on both sides in the middle. A molding insert 7 with a rectangular cross-section is provided at the center of the recessed portion 6. The molding insert 7 has a first side molding surface 8 on the left and right sides, with its bottom extending to the lower end face of the recessed portion 6. The molding insert 7 has a second side molding surface 9 on the front and rear sides, with its bottom extending to the upper end face of the molding platform 5. The top of the molding insert 7 has a top molding surface 10 that connects to the first side molding surface 8 and the second side molding surface 9. The top molding surface 10 is also provided with a drawer pull-out opening molding structure 11 with an internal glue inlet channel structure. The lower template 3 is also provided with a side core-pulling mechanism 13 on the left and right sides for forming rectangular annular splicing plates 12 on both sides of the storage drawer body.

[0020] In this invention, the mold uses a drawer pull-out forming structure with an internal glue channel on the top of the forming insert of the lower template, and a side core-pulling mechanism to form a rectangular ring splicing plate, thereby transferring the glue injection position to the inner side of the drawer pull-out opening, which is not an external surface. This design avoids the formation of glue holes on the outer surface of the product, while the side core-pulling mechanism can accurately form the rectangular ring structure required for splicing, solving the appearance defects caused by traditional glue injection methods and improving the surface quality and splicing compatibility of the product.

[0021] Specifically, the drawer pull-out forming structure 11 includes a drawer pull-out forming block 14 protruding from the top of the forming insert 7, wherein the cross-section of the drawer pull-out forming block 14 is rectangular. The drawer pull-out forming structure adopts a rectangular cross-section protruding forming block design, which precisely matches the structure of the drawer pull-out opening. This forming block provides a stable mounting carrier for the internal glue inlet channel, ensuring precise alignment between the glue inlet channel and the forming cavity, while also ensuring the forming accuracy of the drawer pull-out opening, making the edges of the pull-out opening neat and the dimensions consistent, improving the smoothness of drawer pulling, and avoiding the deformation problem of the pull-out opening caused by traditional forming methods.

[0022] Specifically, the internal glue inlet channel structure includes an internal glue inlet channel 15 recessed inward on the top surface of the drawer pull-out molded block 14, which is connected to the side of the top molded surface 10. The internal glue inlet channel, with its recessed top surface and connection to the side of the top molded surface, allows the glue to be introduced into the molding cavity from the non-exterior surface inside the drawer pull-out. This channel structure shortens the glue flow path, reduces flow resistance, and avoids defects such as bubbles and shrinkage marks generated during the flow process. Furthermore, the glue inlet position is hidden on the non-exterior surface, completely eliminating glue marks on the outer surface and further improving the product's appearance integrity.

[0023] Preferably, there are at least two injection points between the inner injection channel 15 and the top molding surface 10. The presence of at least two injection points between the inner injection channel and the top molding surface enables simultaneous injection of the adhesive into the molding cavity at multiple points. This design allows the adhesive to diffuse evenly within the molding cavity, avoiding problems of insufficient or excessive filling in certain areas, ensuring uniform wall thickness across all parts of the product, reducing internal stress, lowering the risk of product deformation and cracking, and simultaneously improving injection molding efficiency and shortening the holding time.

[0024] Specifically, the side core-pulling mechanism 13 includes side-pulling slides 16 disposed on both sides of the molding platform 5. A side-pulling slider 17 is slidably connected within the side-pulling slides 16. A side-forming block 18 is protruding from the inner end of the side-pulling slider 17, inserted into the recess 6, with its inner end face corresponding to the first side-forming surface 8 of the molding insert 7. A gap exists between the side-forming block 18 and the first side-forming surface 8. The side core-pulling mechanism drives the side-forming block to precisely insert into the recess through the sliding cooperation of the side-pulling slides and the side-pulling slider. The reserved gap between the side-forming block and the first side-forming surface enables lateral molding and demolding of the rectangular ring splicing plate, avoiding the demolding difficulties caused by traditional one-piece molding. Simultaneously, the reserved gap compensates for material shrinkage, ensuring the dimensional accuracy of the splicing plate, improving the fit during splicing, and avoiding excessively large splicing gaps.

[0025] Specifically, the outer edge of the inner end face of the side forming block 18 is recessed inward and has a rectangular annular splicing plate forming groove 19. The rectangular annular splicing plate forming groove on the outer edge of the inner end face of the side forming block precisely matches the structure of the rectangular annular splicing plate. This forming groove can directly form the annular structure of the splicing plate without subsequent processing, simplifying the production process. At the same time, the rectangular cross-section of the forming groove ensures the flatness and perpendicularity of the splicing plate, making the positioning accurate during splicing and improving the overall splicing stability of the modular storage drawer.

[0026] Specifically, the upper template 2 is inclinedly provided with a core-pulling rod mounting groove 20 for mounting the core-pulling rod. The side-pulling slider 17 is provided with a core-pulling rod driving groove 21 corresponding to the core-pulling rod mounting groove 20. The lower end of the core-pulling rod installed in the core-pulling rod mounting groove 20 is inserted into the core-pulling rod driving groove 21. The inclined core-pulling rod mounting groove of the upper template cooperates with the core-pulling rod driving groove of the side-pulling slider. The side-pulling slider is driven to slide by the core-pulling rod. This inclined driving structure realizes side core pulling and resetting by synchronizing the mold closing and opening movements. No additional power mechanism is required, which simplifies the mold structure and reduces equipment costs. At the same time, the driving process is smooth and precise, avoiding molding defects caused by the side-pulling slider movement jamming, and improving the reliability of mold operation.

[0027] Specifically, two straight ejector blocks 22 are embedded on the upper surface of the molding platform 5, located on the front and rear sides of the molding insert 7 respectively. The upper surface of the straight ejector blocks 22 is flush with the upper surface of the molding platform 5, and the inner side of the upper surface of the straight ejector blocks 22 is connected to the bottom of the second molding surface 9. The straight ejector blocks embedded on the upper surface of the molding platform, with their upper surfaces flush with the molding platform and their inner sides connected to the bottom of the second molding surface, provide stable support and a molding surface for the bottom of the product, ensuring a flat bottom. Simultaneously, they can directly push the bottom of the product during demolding, ensuring even distribution of demolding force and preventing deformation or damage caused by excessive localized force during demolding, thus improving the product molding qualification rate.

[0028] Specifically, a lifting plate 23 is provided on the lower side of the lower mold plate 3, and the bottom of the straight ejector block 22 is connected to the lifting plate 23 through two straight ejector rods 24. The lifting plate on the lower side of the lower mold plate and the straight ejector block connected to the lifting plate through the straight ejector rods form a synchronous lifting structure. This design ensures that the straight ejector blocks push the product upwards synchronously during demolding, ensuring balanced force on the product and avoiding product tilting and mold jamming problems caused by unilateral lifting. At the same time, the lifting plate provides stable driving force transmission, improving the smoothness and reliability of the demolding action, shortening the demolding cycle, and increasing production efficiency.

[0029] Specifically, the bottom of the ejector block 22 is provided with a countersunk hole corresponding to the ejector rod 24, and the top of the ejector block 22 is provided with a bolt mounting countersunk hole 25 communicating with the countersunk hole. The top of the ejector rod 24 is provided with a threaded groove 26. The bottom end of the bolt installed in the bolt mounting countersunk hole 25 can be screwed into the threaded groove on the top of the ejector rod 24 to fix the ejector block 22 and the ejector rod 24. The ejector block is fixed to the ejector rod by bolts. The bolt mounting countersunk hole and the countersunk hole cooperate to achieve precise positioning and fixation. This detachable connection structure facilitates the installation, replacement and maintenance of the ejector block. When the ejector block is worn or needs to be adapted to different specifications of products, it can be quickly replaced, reducing mold maintenance costs. At the same time, the bolt fixing method ensures the firmness of the connection between the ejector block and the ejector rod, avoiding the decrease in molding accuracy caused by loosening during demolding, and ensuring the stability of product quality.

[0030] The working principle of this utility model is as follows: the mold sets a drawer pull-out forming structure with an internal glue inlet channel on the top of the forming insert of the lower template, and forms a rectangular ring splicing plate in conjunction with the side core pulling mechanism, thereby transferring the glue inlet position to the non-exterior surface inside the drawer pull-out opening; this design avoids the formation of glue outlets on the outer surface of the product, while the side core pulling mechanism can accurately form the rectangular ring structure required for splicing, solving the appearance defects caused by traditional glue inlet methods and improving the surface quality and splicing compatibility of the product; The drawer pull-out molding structure features a rectangular cross-section protruding molding block design that precisely matches the structure of the drawer pull-out opening. This molding block provides a stable mounting platform for the internal glue inlet channel, ensuring precise alignment between the glue inlet channel and the molding cavity. It also guarantees the molding accuracy of the drawer pull-out opening, resulting in neat edges and consistent dimensions, improving the smoothness of drawer operation and avoiding the deformation problems caused by traditional molding methods. The internal glue inlet channel uses a concave design on the top surface of the molding block, connecting to the side of the top molding surface. This allows the glue to be introduced into the molding cavity from the non-exterior surface inside the drawer pull-out opening. This channel structure shortens the glue flow path, reduces flow resistance, and avoids defects such as bubbles and shrinkage marks generated during glue flow. Furthermore, the glue inlet position is hidden on the non-exterior surface, completely eliminating glue marks on the outer surface and further enhancing the product's appearance integrity. The side-pulling mechanism drives the side molding block to precisely insert into the recessed part through the sliding cooperation of the side-pulling slide and the side-pulling slider. A gap is reserved between the side molding block and the first side molding surface. This structure achieves lateral molding and demolding of the rectangular annular splicing plate, avoiding the demolding difficulties caused by traditional one-piece molding. Simultaneously, the reserved gap compensates for material shrinkage, ensuring the dimensional accuracy of the splicing plate, improving the fit during splicing, and avoiding excessively large splicing gaps. A rectangular annular splicing plate forming groove with a rectangular cross-section is set on the outer edge of the inner end face of the side molding block, precisely matching the structure of the rectangular annular splicing plate. This forming groove can directly form the annular structure of the splicing plate without... Subsequent processing is required, which simplifies the production process. At the same time, the rectangular cross-section of the forming groove ensures the flatness and perpendicularity of the splicing plate, making the positioning accurate during splicing and improving the overall splicing stability of the modular storage drawer. The upper template is inclined with a core-pulling rod mounting groove, which cooperates with the core-pulling rod drive groove of the side slide block. The side slide block is driven by the core-pulling rod. This inclined drive structure realizes the side core pulling and resetting by synchronizing the mold closing and opening movements. No additional power mechanism is required, which simplifies the mold structure and reduces equipment costs. At the same time, the drive process is smooth and precise, avoiding molding defects caused by the side slide block movement jamming and improving the reliability of mold operation. A straight ejector block is embedded in the upper surface of the molding platform, with its upper surface flush with the molding platform and its inner side connected to the bottom of the second molding surface. The straight ejector block provides stable support and a molding surface for the bottom of the product, ensuring a flat bottom. Simultaneously, it can directly push the bottom of the product during demolding, ensuring even distribution of demolding force and preventing deformation or damage caused by excessive localized force during demolding, thus improving the product molding pass rate. A lifting plate is installed on the lower side of the lower mold plate, and the straight ejector block is connected to the lifting plate via a straight ejector rod, forming a synchronous lifting structure. This design allows the straight ejector block to push the product upwards synchronously during demolding, ensuring balanced force on the product and preventing product tilting caused by unilateral lifting. The ejector plate addresses mold jamming issues while providing stable driving force transmission, improving the smoothness and reliability of demolding, shortening the demolding cycle, and increasing production efficiency. The ejector block is fixed to the ejector rod with bolts, and the bolt mounting countersunk holes and insertion countersunk holes cooperate to achieve precise positioning and fixation. This detachable connection structure facilitates the installation, replacement, and maintenance of the ejector block. When the ejector block is worn or needs to be adapted to different product specifications, it can be quickly replaced, reducing mold maintenance costs. At the same time, the bolt fixing method ensures the firmness of the connection between the ejector block and the ejector rod, avoiding loosening during demolding and resulting in a decrease in molding accuracy, thus ensuring the stability of product quality.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A modular plastic storage drawer molding die, comprising a top plate (1), an upper template (2), and a lower template (3), characterized in that, A storage drawer body forming cavity (4) is provided between the upper template (2) and the lower template (3). A forming platform (5) is provided on the lower template (3). The forming platform (5) has a concave part (6) that runs horizontally through the forming platform (5) on both sides in the middle. A forming insert (7) with a rectangular cross section is provided at the center of the concave part (6). The left and right sides of the forming insert (7) have a first side forming surface (8) that extends to the lower end face of the concave part (6). The front and rear sides of the forming insert (7) have a second side forming surface (9) that extends to the upper end face of the forming platform (5). The top of the forming insert (7) has a top forming surface (10) that connects to the first side forming surface (8) and the second side forming surface (9). The top forming surface (10) is also provided with a drawer pull-out forming structure (11) with an internal glue flow channel structure. The left and right sides of the lower template (3) are also provided with a side core pulling mechanism (13) for forming rectangular ring splicing plates (12) on both sides of the storage drawer body.

2. The modular plastic storage drawer molding die according to claim 1, characterized in that, The drawer pull-out forming structure (11) includes a drawer pull-out forming block (14) protruding from the top of the forming insert (7), and the cross-section of the drawer pull-out forming block (14) is rectangular.

3. The modular plastic storage drawer molding die according to claim 2, characterized in that, The internal glue inlet channel structure includes an internal glue inlet channel (15) recessed inward on the top surface of the drawer pull-out molding block (14), and the internal glue inlet channel (15) is connected to the side of the top molding surface (10).

4. The modular plastic storage drawer molding die according to claim 3, characterized in that, There are at least two injection points between the inner glue inlet channel (15) and the top molding surface (10).

5. The modular plastic storage drawer molding die according to claim 1, characterized in that, The side core-pulling mechanism (13) includes side-pulling slides (16) on both sides of the molding platform (5). A side-pulling slider (17) is slidably connected in the side-pulling slide (16). A side molding block (18) is provided with a protruding inner end of the side-pulling slider (17) and inserted into the concave part (6). The inner end face and the first side molding surface (8) of the molding insert (7) are correspondingly arranged. There is a gap between the side molding block (18) and the first side molding surface (8).

6. The modular plastic storage drawer molding die according to claim 5, characterized in that, The outer edge of the inner end face of the side forming block (18) is recessed inward and provided with a rectangular annular splicing plate forming groove (19) with a rectangular cross section.

7. The modular plastic storage drawer molding die according to claim 5, characterized in that, The upper template (2) is inclinedly provided with a core-pulling rod mounting groove (20) for installing the core-pulling rod, and the side sliding block (17) is provided with a core-pulling rod driving groove (21) corresponding to the core-pulling rod mounting groove (20). The lower end of the core-pulling rod installed in the core-pulling rod mounting groove (20) is inserted into the core-pulling rod driving groove (21).

8. The modular plastic storage drawer molding die according to claim 1, characterized in that, The upper surface of the forming platform (5) is fitted with two straight top blocks (22) located on the front and rear sides of the forming insert (7). The upper surface of the straight top block (22) is flush with the upper surface of the forming platform (5). The inner side of the upper surface of the straight top block (22) is connected to the bottom of the second side forming surface (9).

9. The modular plastic storage drawer molding die according to claim 8, characterized in that, The lower template (3) is provided with a lifting plate (23) on its lower side, and the bottom of the straight block (22) is connected to the lifting plate (23) by two straight rods (24).

10. The modular plastic storage drawer molding die according to claim 9, characterized in that, The bottom of the straight push block (22) is provided with a countersunk hole corresponding to the straight push rod (24), the top of the straight push block (22) is provided with a bolt mounting countersunk hole (25) communicating with the countersunk hole, and the top of the straight push rod (24) is provided with a threaded groove (26). The bottom end of the bolt installed in the bolt mounting countersunk hole (25) can be screwed into the threaded groove on the top of the straight push rod (24) to fix the straight push block (22) and the straight push rod (24).

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