Demolding device suitable for bidirectional injection molding product

Abstract

The utility model discloses a demolding device suitable for bidirectional injection molding products. The demolding device is used for demolding of structures with internal threads and inner holes. Comprising an upper die and a lower die for forming a product, an axial demolding assembly is arranged at the input end of the lower mold, and a circumferential demolding assembly is arranged on the side face of the lower mold; the axial demolding assembly at least comprises a sliding block and an insert which synchronously move in the axis direction of a product. The circumferential demolding assembly at least comprises a rack and a thread core which are arranged in a meshed mode, and the rack is perpendicular to the insert. The rack penetrates through the lower die; the thread core is located in the lower die and arranged on the periphery of the insert in a sleeving mode, and a thread structure matched with an internal thread of a product is formed at the tail end of the thread core. The mold has the advantages that the product in the lower mold is demolded in two directions through the axial demolding assembly and the circumferential demolding assembly, after axial demolding, the insert is separated from the product to expose an inner hole, after circumferential demolding, the thread core is separated from the product to expose an internal thread, complete demolding of the product is completed, and the quality of the demolded product is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, and in particular relates to a demolding device suitable for bidirectional injection molded products. Background Technology

[0002] Injection molding is a molding method that combines injection and molding. Its advantages include high production speed and efficiency, automated operation, a wide variety of designs and shapes (from simple to complex), and sizes ranging from large to small. It also produces dimensionally accurate products, facilitates product updates, and can create complex shapes. Injection molding is suitable for mass production and molding of complex-shaped products. It involves injecting fully molten plastic material, stirred by a screw at a specific temperature, into a mold cavity under high pressure, and then cooling and solidifying to obtain the molded product. This method is suitable for the mass production of complex-shaped parts and is one of the important processing methods.

[0003] Because the structures of injection molding molds are all identical, their demolding devices need to be structurally matched according to the characteristics of the mold structure to ensure that the product can be demolded completely and effectively. For products with internal threads and countersunk holes, the structure of the demolding device is mostly similar to that in patent CN207889048U, "Automatic Demolding Structure and Injection Mold with Threaded Side Core Pulling". Existing technologies, including this patent, typically use a rack and pinion meshing with a gear shaft, with the gear shaft and insert connected by threads. During mold opening, rotation achieves threaded demolding, and finally, the insert is demolded from the product through a slanted guide post at the end of the rack. This technical solution uses the rotation of the gear shaft to drive the threaded structure, which moves the insert along the product axis to achieve threaded demolding. However, as is well known, threaded structures inevitably experience tolerance issues and stripping during tapping and use. Stripping, in particular, directly prevents the mold from effectively demolding from the product, so this demolding method needs further improvement.

[0004] To address the aforementioned issues, designing a demolding device suitable for bidirectional injection molded products is a crucial technical problem that those skilled in the art need to solve. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems in the prior art and provide a demolding device suitable for bidirectional injection molded products.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A demolding device suitable for bidirectional injection molded products, used for demolding products with internal threads and internal holes; comprising an upper mold and a lower mold for molding the product; the input end of the lower mold is provided with an axial demolding assembly, and the side of the lower mold is provided with a circumferential demolding assembly; the axial demolding assembly includes at least a slider and an insert that move synchronously along the product axis; the circumferential demolding assembly includes at least a meshing rack and a threaded core, with the rack perpendicular to the insert; the rack passes through the lower mold; the threaded core is located inside the lower mold and sleeved on the outer periphery of the insert, and the end of the threaded core forms a thread structure that matches the internal thread of the product; initial state. The slider abuts against the lower mold, the end of the insert is located in the inner hole of the product, the first end of the threaded core abuts against the slider, and the threaded structure is located at the internal thread of the product; in the first demolding state, the axial demolding assembly is activated, causing the slider to separate from the lower mold, and the end of the insert to exit the inner hole of the product, the first end of the threaded core is spaced apart from the slider, and the threaded structure is located at the internal thread of the product; in the second demolding state, the circumferential demolding assembly is activated, driving the rack to move along its set direction, causing the threaded core to rotate and move towards the slider until the threaded structure exits the internal thread of the product, completing the product demolding.

[0008] Preferably, the lower mold has a molding cavity and a fixing cavity; the molding cavity contains the injection-molded product; a positioning block is fixed in the fixing cavity, the insert and the threaded core pass through the positioning block, and the positioning block has a movable space to facilitate the movement of the threaded core; an opening is formed in the movable space to facilitate the accommodation of the rack, and the teeth of the rack are located in the movable space and mesh with the threaded part of the threaded core.

[0009] Preferably, a connecting block is provided at the end of the positioning block near the slider, and the connecting block is sleeved on the first end of the threaded core and the two are screwed together.

[0010] Preferably, the bottom surface of the rack abuts against the limiting block, and the limiting block is detachably connected to the lower mold.

[0011] Preferably, the circumferential demolding assembly further includes a driving member for driving the rack to move, and the power output end of the driving member is connected to the rack through a guide block.

[0012] Preferably, guide posts are arranged parallel to each other on both sides of the power output end of the drive component, the guide block is located between the guide posts, and the two sides of the guide block have concave and convex structures that engage with the guide posts.

[0013] Preferably, the axial demolding assembly further includes an inclined guide post penetrating the slider and a wedge block located on the slider away from the fixed cavity; the top end of the inclined guide post is located inside the connecting block, and both the connecting block and the wedge block are fixedly connected to the upper mold; during one demolding process, the inclined guide post drives the slider to move towards the wedge block.

[0014] Preferably, guide strips are provided on both sides of the slider, and the guide strips have grooves that engage with the side wall of the slider.

[0015] Preferably, the first end of the insert is fixedly connected to the slider via a bushing.

[0016] The advantages of this utility model's technical solution are mainly reflected in:

[0017] The product in the lower mold is demolded in two directions by using an axial demolding assembly and a circumferential demolding assembly. After axial demolding, the insert is removed from the product, exposing the inner hole. After circumferential demolding, the threaded core is removed from the product, exposing the internal thread, thus completing the demolding of the product and ensuring the quality of the demolded product.

[0018] By separating the insert from the threaded core, and driving them separately through different demolding components, demolding can be achieved in two different directions with high demolding efficiency and quality.

[0019] The axial demolding assembly is activated by the separation of the upper and lower molds. During the first demolding process, the guide bar reduces the wobbling amplitude of the slider and insert in the Y-axis direction. During the second demolding process, the limit block and guide post limit the rack to move only in the Y-axis direction, reducing its wobbling amplitude in the X and Z-axis directions and ensuring the integrity of the demolded product. Attached Figure Description

[0020] Figure 1 : A perspective view of a preferred embodiment of the present invention;

[0021] Figure 2 Top view of a preferred embodiment of this utility model;

[0022] Figure 3 : A three-dimensional cross-sectional view of a preferred embodiment of this utility model;

[0023] Figure 4 Preferred embodiments of this utility model Figure 3 Enlarged view of section A;

[0024] Figure 5 Cross-sectional view of the preferred embodiment of this utility model in the first demolding state;

[0025] Figure 6 Cross-sectional view of the secondary demolding state in a preferred embodiment of this utility model. Detailed Implementation

[0026] The purpose, advantages, and features of this utility model will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this utility model, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0027] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0028] like Figures 1 to 2 As shown, this utility model discloses a demolding device suitable for bidirectional injection molded products, used for demolding products with internal threads and internal holes; it includes an upper mold and a lower mold 3 for molding the product. An axial demolding component 1 is provided at the input end of the lower mold 3, and a circumferential demolding component 2 is provided on the side of the lower mold 3. The axial demolding component 1 and the circumferential demolding component 2 achieve demolding of the product in both axial and circumferential directions in the lower mold 3. After axial demolding, the internal hole of the product is exposed; after circumferential demolding, the internal thread of the product is exposed, completing the complete demolding of the product and ensuring the quality of the demolded product.

[0029] like Figures 1 to 3 As shown, the axial demolding assembly 1 includes at least a slider 11 and an insert 12 that move synchronously along the product axis. The head end of the insert 12 is fixedly connected to the slider 11 via a bushing 112. Further, the axial demolding assembly 1 also includes an inclined guide post 13 penetrating the slider 11 and a wedge block 14 located on the slider 11 away from the fixed cavity 31 in the lower mold 3. The top end of the inclined guide post 13 is located within a connecting block 131, and both the connecting block 131 and the wedge block 14 are fixedly connected to the upper mold; during one demolding process, the inclined guide post 13 drives the slider 11 to move towards the wedge block 14 until it is positioned as shown. Figure 5 The state shown.

[0030] Furthermore, such as Figure 1 or Figure 3As shown, guide strips 111 are also provided on both sides of the slider 11, and the guide strips 111 have grooves that engage with the side walls of the slider 11. The guide strips guide and limit the slider 11, ensuring the coaxiality of the insert 12 and the product during demolding, thereby ensuring the demolding quality.

[0031] like Figures 3 to 6 As shown, the circumferential demolding assembly 2 includes at least a meshing rack 21 and a threaded core 22, with the rack 21 perpendicular to the insert 12. The rack 21 penetrates the lower mold 3, and its bottom surface abuts against a limiting block 301, which is detachably connected to the lower mold 3. The threaded core 22 is located inside the lower mold 3 and fitted around the outer periphery of the insert 12. After one demolding cycle, the threaded core 22 can move along the width direction of the rack 21 until it reaches a position similar to... Figure 6 The state shown. (As indicated) Figure 4 The end of the threaded core 22 shown has a thread structure 221 that matches the internal thread of the product.

[0032] Furthermore, such as Figures 1 to 3 As shown, the circumferential demolding assembly 2 also includes a driving component 210 for driving the rack 21 to move. The driving component 210 can be a known component capable of driving movement in a linear direction, including cylinders, hydraulic cylinders, and linear modules, which will not be elaborated upon here. The power output end of the driving component 210 is connected to the rack 21 via a guide block 211. Furthermore, as... Figure 1 or Figure 2 As shown, guide posts 212 are also arranged parallel to each other on both sides of the power output end of the drive component 210. The guide block 211 is located between the guide posts 212, and the two sides of the guide block 211 have concave and convex structures that engage with the guide posts 212. The guide posts 212 limit the guide block 211 and the rack 21, reducing the wobbling amplitude of the rack 21 during movement and improving demolding efficiency.

[0033] Combination Figure 1 and Figure 3As shown, the lower mold 3 has a molding cavity 30 and a fixing cavity 31, wherein the molding cavity 30 contains the injection-molded product. A positioning block 311 is fixed within the fixing cavity 31, through which the insert 12 and the threaded core 22 pass. An active space 310 is formed within the positioning block 311 to facilitate the movement of the threaded core 22, and the width of the active space 310 is greater than the width of the threaded portion of the threaded core 22. After the first demolding, a gap exists between the insert 12 and the threaded core 22. Therefore, during the second demolding process, the threaded core 22 rotates and moves along its axis within the active space 310 until the second demolding is completed. An opening is formed in the active space 310 to accommodate the rack 21, whose teeth are located within the active space 310 and engage with the threaded portion of the threaded core 22.

[0034] Furthermore, a connecting block 312 is provided at the end of the positioning block 311 near the slider 11. The connecting block 312 is sleeved on the first end of the threaded core 22, and the two are screwed together. The screwing connection between the connecting block 312 and the threaded core 22 determines the direction of movement of the threaded core 22 during the secondary demolding process, reducing the amplitude of reciprocating movement of the threaded core 22 during the secondary demolding process. Compared with the prior art, the screwing structure of the connecting block 312 and the threaded core 22 in this technical solution does not play a dominant role in the movement of the threaded core 22; it only plays a role in preventing reciprocating movement during the movement of the threaded core 22. The dominant movement of the threaded core 22 is due to the gap between the insert 12 and the threaded core 22, which causes the threaded core 22 to change its relative position during rotation.

[0035] Initial state, such as Figure 3 As shown, the upper mold and the lower mold 3 are closed. At this time, the slider 11 abuts against the lower mold 3, the end of the insert 12 is located in the inner hole of the product, the head of the threaded core 22 abuts against the slider 11, and the threaded structure 221 is located at the internal thread of the product.

[0036] One demolding state, such as Figure 5 As shown, the upper mold and / or the lower mold 3 move relative to each other, opening their parting surfaces. Simultaneously, the axial demolding assembly 1 is activated, causing the slider 11 to move along the product's axial direction within the width defined by the guide strip 111, separating from the lower mold 3 until the end of the insert 12 exits the product's inner hole. At this time, a gap is formed between the insert 12 and the threaded core 22, the head end of the threaded core 22 is spaced apart from the slider 11, and the threaded structure 221 is located at the product's internal thread.

[0037] Secondary demolding state, such as Figure 6 As shown, the drive unit 210 in the circumferential demolding assembly 2 is activated, which drives the rack 21 to move along its set direction, causing the threaded core 22 to rotate and move as a whole towards the slider 11 until the threaded structure 221 disengages from the internal thread of the product, thus completing the product demolding.

[0038] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A demolding device suitable for bidirectional injection molded products, for demolding with internal thread and internal bore structure; comprising an upper mold and a lower mold (3) for the molded product; characterized by: The input end of the lower mold (3) is provided with an axial demolding assembly (1), and the side surface of the lower mold (3) is provided with a circumferential demolding assembly (2); the axial demolding assembly (1) at least includes a slider (11) and an insert (12) which move synchronously along the product axis direction; the circumferential demolding assembly (2) at least includes a gear rack (21) and a threaded core (22) which are engaged, and the gear rack (21) is vertically arranged with the insert (12); the gear rack (21) penetrates through the lower mold (3); the threaded core (22) is located in the lower mold (3) and is sleeved on the outer periphery of the insert (12), and the end of the threaded core (22) is formed with a threaded structure (221) matched with the internal thread of the product; in the initial state, the slider (11) abuts against the lower mold (3), the end of the insert (12) is located in the internal hole of the product, the leading end of the threaded core (22) abuts against the slider (11), and the threaded structure (221) is located at the internal thread of the product; in the first demolding state, the axial demolding assembly (1) is started to separate the slider (11) from the lower mold (3), and the end of the insert (12) is out of the internal hole of the product, the leading end of the threaded core (22) is spaced apart from the slider (11), and the threaded structure (221) is located at the internal thread of the product; in the second demolding state, the circumferential demolding assembly (2) is started to drive the gear rack (21) to move along the arrangement direction, so that the threaded core (22) rotates and moves towards the slider (11), until the threaded structure (221) is out of the internal thread of the product, and the product demolding is completed.

2. The demolding device suitable for bidirectional injection-molded products according to claim 1, characterized in that: The lower mold (3) is formed with a forming cavity (30) and a fixing cavity (31); the forming cavity (30) contains the injection molded product; the fixing cavity (31) is fixed with a positioning block (311), the insert (12) and the threaded core (22) penetrate through the positioning block (311), and the positioning block (311) is formed with a movable space (310) for the movement of the threaded core (22); the movable space (310) is formed with an opening for accommodating the gear rack (21), and the tooth part of the gear rack (21) is located in the movable space (310) and engaged with the threaded part of the threaded core (22).

3. The demolding device suitable for bidirectional injection-molded products according to claim 2, characterized in that: The end of the positioning block (311) close to the slider (11) is provided with a connecting block (312), the connecting block (312) is sleeved on the leading end of the threaded core (22), and the two are screwed.

4. The demolding device suitable for bidirectional injection-molded products according to claim 1, characterized in that: The bottom surface of the gear rack (21) abuts against a limiting block (301), and the limiting block (301) is detachably connected to the lower mold (3).

5. The demolding device suitable for bidirectional injection-molded products according to claim 4, characterized in that: The circumferential demolding assembly (2) further includes a driving member (210) for driving the gear rack (21) to move, and the power output end of the driving member (210) is connected with the gear rack (21) through a guide block (211).

6. The demolding device suitable for bidirectional injection-molded products according to claim 5, characterized in that: Two sides of the power output end of the driving member (210) are also provided with guiding columns (212) in parallel, the guiding block (211) is located between the guiding columns (212), and both sides of the guiding block (211) are formed with concave-convex structures for clamping the guiding columns (212).

7. The demolding device suitable for bidirectional injection-molded products according to claim 2, characterized in that: The axial demolding assembly (1) further comprises a slanted guide column (13) penetrating through the sliding block (11) and a wedge block (14) located away from the fixed cavity (31) of the sliding block (11); the top end of the slanted guide column (13) is located in a connecting block (131), and both the connecting block (131) and the wedge block (14) are fixedly connected with the upper die; in the process of one-time demolding, the slanted guide column (13) drives the sliding block (11) to move towards the wedge block (14).

8. The demolding device suitable for bidirectional injection-molded products according to claim 7, characterized in that: Both sides of the sliding block (11) are further provided with guiding strips (111), and the guiding strips (111) are formed with clamping grooves for clamping the side walls of the sliding block (11).

9. The demolding device suitable for bidirectional injection-molded products according to claim 1, characterized in that: The first end of the insert (12) is fixedly connected with the sliding block (11) through a bushing (112).

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