A plastic basket handle hole injection molding mold inner shrinkage type injection molding structure

Abstract

The application relates to a retractable injection molding structure of a plastic basket handle hole injection molding mold, which comprises a core mold and a core pulling mechanism arranged in the core mold, the core pulling mechanism comprises a driving assembly and two core pulling blocks, the core mold comprises a core seat and a core block fixed in the core seat, two sides of the core block are respectively provided with mutually symmetrical sliding grooves, the two core pulling blocks are respectively slid on the two sliding grooves, the end of the core pulling block is used for forming the inner side edge fillet of the handle hole, and the driving assembly is used for driving the two core pulling blocks to slide along the core pulling direction. When the injection mold is opened, the driving assembly drives the two core pulling blocks to slide along the core pulling direction to the inner side to be separated from the product, since the end of the core pulling block is directly used for forming the inner side edge of the handle hole, the end profile is designed to be filleted, the smooth transition edge can be formed at one time during injection molding, the feeling of being jammed by the right-angle edge is effectively avoided, a subsequent polishing process is saved, and the production efficiency and product consistency are improved.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to an internally retractable injection molding structure for injection molding of plastic basket handle holes. Background Technology

[0002] Production such as Figure 1 When making the handle hole 11 of the plastic basket 1 shown, a core-pulling structure is usually set on both sides of the cavity of the mold to pull the core of the handle hole 11. However, after pulling the core, the inner edge of the handle hole 11 will be a right angle. If the user lifts the handle from the inside, there will be a noticeable rough feeling due to the lack of transition at the right angle edge. Currently, the right angle edge is rounded through subsequent grinding process. However, this method requires additional processing steps, which not only increases the total production cost, but also makes it difficult to guarantee the consistency of the rounding accuracy of each batch of products, and cannot achieve large-scale and efficient production. Utility Model Content

[0003] To improve the problem of the inner edge of the handle hole being uncomfortable to the touch after injection molding, this application provides an inward-shrinking injection molding structure for the plastic basket handle hole injection mold.

[0004] The technical solution provided in this application for an internally retractable injection molding structure for a plastic basket handle hole injection mold is as follows: A shrink-type injection molding structure for a plastic basket handle hole injection mold includes a core mold and a core-pulling mechanism disposed within the core mold. The core-pulling mechanism includes a drive assembly and two core-pulling blocks. The core mold includes a core seat and core blocks fixed within the core seat. Symmetrical grooves are formed on both sides of the core blocks. The two core-pulling blocks slide on the two grooves respectively. The ends of the core-pulling blocks are used to form the inner edge rounded corners of the handle hole. The drive assembly is used to drive the two core-pulling blocks to slide along the core-pulling direction.

[0005] By adopting the above technical solution, when the injection molding mold is opened, the drive component drives the two core-pulling blocks to slide inward along the core-pulling direction and separate from the product. Since the end of the core-pulling block is directly used to form the inner edge of the handle hole, by designing the rounded corners of its end contour, a smooth transition edge can be formed in one go during injection molding, which effectively avoids the rough feel caused by right-angled edges, and at the same time eliminates the subsequent grinding process, improving production efficiency and product consistency.

[0006] Preferably, the drive assembly includes a hydraulic cylinder and a slide block. The slide block is located between two core-pulling blocks and slides within the core block along a sliding direction perpendicular to the two core-pulling blocks. The slide block and the core-pulling blocks are slidably connected in an inclined direction through the cooperation of an I-beam and an I-beam groove. The hydraulic cylinder is fixedly disposed on the outside of the core seat, and the piston rod of the hydraulic cylinder is fixedly connected to the slide block.

[0007] By adopting the above technical solution, the hydraulic cylinder drives the slide to move linearly. Through the inclined cooperation of the I-block and the I-groove, the linear motion of the slide is converted into the lateral linear motion of the two core-pulling blocks moving away from or towards each other, thereby realizing core pulling and resetting. This transmission method has a compact structure, smooth movement, and can effectively ensure the synchronization of core pulling on both sides.

[0008] Preferably, the core block has an installation groove on one side facing the inner bottom wall of the core seat, and the inner bottom wall of the core seat has a movable groove communicating with the installation seat. Two installation blocks are fixed in the installation groove. The slide has stepped surfaces on both sides, and the stepped surfaces abut against the two installation blocks. The two ends of the slide slide on the two installation blocks respectively. The ends of the two installation blocks and the slide extend into the movable groove respectively. The piston rod of the hydraulic cylinder extends into the movable groove and is fixedly connected to the slide.

[0009] By adopting the above technical solution, the mounting groove and the movable groove provide installation and movement space for the slide and the mounting block. The two mounting blocks support and guide the slide, and the contact between the stepped surface and the mounting block restricts the vertical displacement of the slide, ensuring that the slide slides smoothly in the horizontal direction, thereby improving the rigidity and motion accuracy of the entire drive structure.

[0010] Preferably, a gap is left between the slide and the bottom wall of the movable groove.

[0011] By adopting the above technical solution, the gap reserved between the slide and the bottom wall of the movable groove can avoid sliding interference caused by processing or assembly errors, ensuring the smoothness of the slide's reciprocating motion and improving the reliability of the work.

[0012] Preferably, it also includes a support rod, the two ends of which are detachably fixed to the end of the slide block near the core-pulling block and the piston rod of the cylinder, respectively.

[0013] By adopting the above technical solution, the support rod forms an additional connection and support between the slide and the cylinder piston rod, which enhances the structural rigidity and stability of the slide when subjected to injection molding pressure, prevents the slide from tilting or jamming due to uneven force, and its detachable design also facilitates subsequent maintenance and replacement.

[0014] Preferably, the support rod is inclined, one end of the support rod is bent and fixed to the slide with screws, and the other end of the support rod forms a fixing ring; the piston rod end of the hydraulic cylinder has an annular groove and forms a mating head with a slightly smaller diameter, the fixing ring is sleeved on the mating head, the slide has a slot for inserting the mating head, the mating head is inserted into the slot and fixed to the slide with screws, the fixing ring is clamped by the slide and the piston rod of the hydraulic cylinder, and the two ends of the fixing ring abut against the bottom wall of the slide and the slot respectively.

[0015] By adopting the above technical solution, the bending structure at one end of the support rod and its fixing method with the slide block by screws, as well as the sleeve connection between the fixing ring at the other end and the piston rod joint, together form a solid and easy-to-assemble and disassemble connection node; the fixing ring is clamped between the piston rod and the slide block and limited by the bottom wall of the slot, which effectively prevents the connection from loosening and ensures the reliability of power transmission.

[0016] Preferably, the slide block has a chamfered surface on the side facing the support rod that matches the inclination direction of the support rod, and the end of the support rod near the fixing ring abuts against the chamfered surface.

[0017] By adopting the above technical solution, the chamfered surface on the slide block is closely fitted with the inclined end of the support rod, increasing the contact area between the two. This allows the supporting force of the support rod to be transmitted to the slide block more evenly, further optimizing the force distribution and improving the durability of the structure during repeated operation.

[0018] The main technical effects of this utility model are reflected in the following aspects: 1. When the injection molding mold of this utility model is opened, the driving component drives the two core-pulling blocks to slide inward along the core-pulling direction and separate from the product. Since the end of the core-pulling block is directly used to form the inner edge of the handle hole, by designing the rounded corners of its end contour, a smooth transition edge can be formed in one go during injection molding, which effectively avoids the rough feeling caused by the right angle edge, and at the same time eliminates the subsequent grinding process, improving production efficiency and product consistency. 2. The bending structure at one end of the support rod and its fixing method with the slide block by screws, as well as the sleeve connection between the fixing ring at the other end and the piston rod joint, together form a solid and easy-to-assemble and disassemble connection node; the fixing ring is clamped between the piston rod and the slide block and limited by the bottom wall of the slot, which effectively prevents the connection from loosening and ensures the reliability of power transmission. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of the plastic basket of this application.

[0020] Figure 2 This is a schematic diagram of the structure of the plastic basket formed by the core mold according to an embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the core mold and core-pulling mechanism in an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the core-pulling mechanism in an embodiment of this application.

[0023] Figure 5 It is along Figure 4 Cross-sectional view of line AA in the middle.

[0024] Figure 6 It is along Figure 4 Cross-sectional view of the BB line.

[0025] Figure 7 yes Figure 6 A magnified view of point C in the middle.

[0026] Explanation of reference numerals in the attached drawings: 1. Plastic basket; 11. Handle hole; 2. Core mold; 21. Core seat; 211. Movable groove; 22. Core block; 221. Slide groove; 222. Mounting groove; 223. Mounting block; 3. Core pulling mechanism; 31. Core pulling block; 32. Hydraulic cylinder; 321. Ring groove; 322. Connecting joint; 33. Slide seat; 331. Stepped surface; 332. Slot; 333. Chamfered surface; 35. I-beam groove; 36. I-beam block; 4. Support rod; 41. Fixing ring. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0028] This application discloses an internally retractable injection molding structure for a plastic basket handle hole injection mold.

[0029] Reference Figures 1-4 The internal shrinkage injection molding structure of the plastic basket handle hole injection molding mold of this embodiment includes a core mold 2 and a core pulling mechanism 3 disposed in the core mold 2. The core pulling mechanism 3 includes a drive assembly and two core pulling blocks 31. The core mold 2 includes a core seat 21 and a core block 22 fixed in the core seat 21 by screws. The two sides of the core block 22 are respectively provided with mutually symmetrical sliding grooves 221. The two core pulling blocks 31 slide on the two sliding grooves 221 respectively. The end of the core pulling block 31 is used to form the inner edge rounded corner of the handle hole 11. The drive assembly is used to drive the two core pulling blocks 31 to slide along the core pulling direction.

[0030] Reference Figures 1-4 When the injection molding mold is opened, the drive component drives the two core-pulling blocks 31 to slide inward along the core-pulling direction and separate from the product. Since the end of the core-pulling block 31 is directly used to form the inner edge of the handle hole 11, by designing the rounded corners of its end contour, a smooth transition edge can be formed in one go during injection molding, which effectively avoids the rough feeling caused by the right angle edge, and at the same time eliminates the subsequent grinding process, improving production efficiency and product consistency.

[0031] Reference Figures 3-6The drive assembly includes a hydraulic cylinder 32 and a slide block 33. The slide block 33 is located between two core-pulling blocks 31. The slide block 33 slides within the core block 22 in a sliding direction perpendicular to the two core-pulling blocks 31. An I-shaped groove 35 is provided on the slide block 33. The end of the core-pulling block 31 has an I-shaped block 36. The slide block 33 and the core-pulling block 31 are slidably connected in an inclined direction through the cooperation of the I-shaped block 36 and the I-shaped groove 35. The hydraulic cylinder 32 is fixedly mounted on the outside of the core seat 21 by screws. The piston rod of the hydraulic cylinder 32 is fixedly connected to the slide block 33.

[0032] Reference Figures 3-6 The hydraulic cylinder 32 drives the slide block 33 to move linearly. Through the inclined cooperation of the I-beam block 36 and the I-beam groove 35, the linear motion of the slide block 33 is converted into the lateral linear motion of the two core-pulling blocks 31 moving away from or towards each other, thereby realizing core pulling and resetting. This transmission method has a compact structure and smooth movement, and can effectively ensure the synchronization of core pulling on both sides.

[0033] Reference Figures 3-6 The core block 22 has an installation groove 222 on one side facing the inner bottom wall of the core seat 21. The inner bottom wall of the core seat 21 has a movable groove 211 that connects to the mounting seat. Two mounting blocks 223 are fixed in the installation groove 222 by screws. The slide 33 has stepped surfaces 331 on both sides. The stepped surfaces 331 abut against the two mounting blocks 223. The two ends of the slide 33 slide on the two mounting blocks 223 respectively. The ends of the two mounting blocks 223 and the slide 33 extend into the movable groove 211 respectively. The piston rod of the oil cylinder 32 extends into the movable groove 211 and is fixedly connected to the slide 33.

[0034] Reference Figures 3-6 The mounting groove 222 and the movable groove 211 provide installation and movement space for the slide 33 and the mounting block 223. The two mounting blocks 223 support and guide the slide 33. The step surface 331 of the slide 33 and the abutting fit with the mounting block 223 restrict the vertical displacement of the slide 33, ensuring that the slide 33 slides smoothly in the horizontal direction, and improving the rigidity and motion accuracy of the entire drive structure.

[0035] Reference Figures 3-6 A gap is left between the slide block 33 and the bottom wall of the movable groove 211. The gap reserved between the slide block 33 and the bottom wall of the movable groove 211 can avoid sliding interference caused by machining or assembly errors, ensure the smooth reciprocating motion of the slide block 33, and improve the reliability of the operation.

[0036] Reference Figures 3-7It also includes a support rod 4, whose two ends are detachably fixed to the end of the slide block 33 near the core-pulling block 31 and the piston rod of the cylinder 32, respectively. The support rod 4 forms an additional connection and support between the slide block 33 and the piston rod of the cylinder 32, enhancing the structural rigidity and stability of the slide block 33 when subjected to injection molding pressure, preventing the slide block 33 from tilting or jamming due to uneven force, and its detachable design also facilitates subsequent maintenance and replacement.

[0037] Reference Figures 3-7 The support rod 4 is inclined, with one end bent and fixed to the slide block 33 by screws. The other end of the support rod 4 forms a fixing ring 41. The piston rod end of the cylinder 32 has an annular groove 321 and a slightly smaller diameter mating joint 322. The fixing ring 41 is fitted onto the mating joint 322. The slide block 33 has a slot 332 for the mating joint 322 to be inserted. The mating joint 322 is inserted into the slot 332 and fixed to the slide block 33 by screws. The fixing ring 41 is clamped by the slide block 33 and the piston rod of the cylinder 32. The two ends of the fixing ring 41 abut against the bottom wall of the slide block 33 and the slot 332, respectively.

[0038] Reference Figures 3-7 The bending structure at one end of the support rod 4 and its fixing to the slide block 33 by screws, along with the sleeve connection between the fixing ring 41 at the other end and the piston rod connector 322, together form a strong and easy-to-assemble and disassemble connection node. The fixing ring 41 is clamped between the piston rod and the slide block 33 and is limited by the bottom wall of the slot 332, which effectively prevents the connection from loosening and ensures the reliability of power transmission.

[0039] Reference Figures 3-7 The slide block 33 has a chamfered surface 333 on the side facing the support rod 4, which matches the inclination direction of the support rod 4. The end of the support rod 4 near the fixing ring 41 abuts against the chamfered surface 333.

[0040] Reference Figures 3-7 The chamfered surface 333 on the slide 33 fits tightly with the inclined end of the support rod 4, increasing the contact area between the two. This allows the supporting force of the support rod 4 to be transmitted to the slide 33 more evenly, further optimizing the force distribution and improving the durability of the structure during repeated operation.

[0041] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A type of inward-shrinking injection molding structure for a plastic basket handle hole injection mold, characterized in that: The device includes a core mold (2) and a core-pulling mechanism (3) disposed within the core mold (2). The core-pulling mechanism (3) includes a drive assembly and two core-pulling blocks (31). The core mold (2) includes a core seat (21) and a core block (22) fixed within the core seat (21). The two sides of the core block (22) are respectively provided with mutually symmetrical sliding grooves (221). The two core-pulling blocks (31) slide on the two sliding grooves (221) respectively. The ends of the core-pulling blocks (31) are used to form the inner edge rounded corners of the handle hole (11). The drive assembly is used to drive the two core-pulling blocks (31) to slide along the core-pulling direction.

2. The internally recessed injection molding structure of the injection mold for the plastic basket handle hole according to claim 1, characterized in that: The drive assembly includes a hydraulic cylinder (32) and a slide (33). The slide (33) is located between two core-pulling blocks (31). The slide (33) slides in the core block (22) along a sliding direction perpendicular to the two core-pulling blocks (31). The slide (33) and the core-pulling block (31) are slidably connected in an inclined direction through the cooperation of the I-beam block (36) and the I-beam groove (35). The hydraulic cylinder (32) is fixedly installed on the outside of the core seat (21). The piston rod of the hydraulic cylinder (32) is fixedly connected to the slide (33).

3. The internally recessed injection molding structure of the injection mold for the handle hole of a plastic basket according to claim 2, characterized in that: The core block (22) has an installation groove (222) on one side facing the inner bottom wall of the core seat (21). The inner bottom wall of the core seat (21) has a movable groove (211) that connects to the mounting seat. Two mounting blocks (223) are fixed in the installation groove (222). The slide (33) has stepped surfaces (331) on both sides. The stepped surfaces (331) abut against the two mounting blocks (223). The two ends of the slide (33) slide on the two mounting blocks (223). The ends of the two mounting blocks (223) and the slide (33) extend into the movable groove (211). The piston rod of the oil cylinder (32) extends into the movable groove (211) and is fixedly connected to the slide (33).

4. The internally recessed injection molding structure of the injection mold for the plastic basket handle hole according to claim 3, characterized in that: A gap is left between the slide (33) and the bottom wall of the movable groove (211).

5. The internally recessed injection molding structure of the injection mold for the handle hole of a plastic basket according to claim 3, characterized in that: It also includes a support rod (4), the two ends of which are detachably fixed to one end of the slide block (33) near the core-pulling block (31) and the piston rod of the oil cylinder (32), respectively.

6. The internally recessed injection molding structure for a plastic basket handle hole injection mold according to claim 5, characterized in that: The support rod (4) is inclined, one end of the support rod (4) is bent and fixed to the slide (33) with screws, and the other end of the support rod (4) forms a fixing ring (41); the piston rod end of the oil cylinder (32) is provided with an annular groove (321) and a slightly smaller diameter connector (322) is formed. The fixing ring (41) is sleeved on the connector (322). The slide (33) is provided with a slot (332) for the connector (322) to be inserted. The connector (322) is inserted into the slot (332) and fixed to the slide (33) with screws. The fixing ring (41) is clamped by the slide (33) and the piston rod of the oil cylinder (32). The two ends of the fixing ring (41) abut against the bottom wall of the slide (33) and the slot (332) respectively.

7. The internally recessed injection molding structure for a plastic basket handle hole injection mold according to claim 6, characterized in that: The slide (33) has a chamfered surface (333) on the side facing the support rod (4) that matches the inclination direction of the support rod (4), and the end of the support rod (4) near the fixing ring (41) abuts against the chamfered surface (333).

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