Injection mold

Abstract

This utility model discloses an injection mold, comprising: a mold body and a slanted core-pulling mechanism. The mold body forms an injection cavity with an arc-shaped cavity wall. The slanted core-pulling mechanism includes a pin that movably passes through the arc-shaped cavity wall. The pin moves along the normal direction of the arc-shaped cavity wall to extend into or retract from the injection cavity. The pin is used to install an embedded part, thereby fixing the embedded part to the molded part within the injection cavity. This utility model achieves stable installation of the nut within the injection cavity while avoiding deformation of the arc-shaped bottom shell caused by demolding, thus meeting the processing requirements of the arc-shaped bottom shell.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold. Background Technology

[0002] LED curved screens consist of key structural components such as a curved base shell and a light panel. The curved base shell and light panel are typically connected using bolts and nuts. Therefore, the nut must be stably installed on either the curved base shell or the light panel. Currently, the mainstream solution to improve the reliability of the nut's fixation is to insert the nut as an insert into the curved base shell during the injection molding process. However, injection molding presents the following challenges: to ensure the nut does not shift during injection molding, stable installation of the nut within the injection cavity is essential. This makes the nut susceptible to interference from the mold, making it difficult to demold the curved base shell with the nut embedded. Forced demolding will cause deformation of the curved base shell, thus failing to meet processing requirements. Utility Model Content

[0003] The main purpose of this utility model is to provide an injection mold that, while ensuring the stable installation of the nut in the injection cavity, avoids deformation of the arc-shaped bottom shell caused by demolding, thus meeting the processing requirements of the arc-shaped bottom shell.

[0004] To achieve the above objectives, the present invention proposes an injection mold comprising: a mold body and an inclined core-pulling mechanism. The mold body forms an injection cavity with an arc-shaped cavity wall. The inclined core-pulling mechanism includes a pin that movably passes through the arc-shaped cavity wall. The pin moves along the normal direction of the arc-shaped cavity wall to extend into or retract from the injection cavity. The pin is used to install an embedded part so that the embedded part is fixed in the molded part of the injection cavity.

[0005] Optionally, the free end of the insert is formed with a mounting head, which is used to install the embedded part so that the embedded part is fixed to the molded part in the injection cavity by injection molding.

[0006] Optionally, the mounting head includes a guide portion and a limiting portion arranged sequentially, the guide portion being located at the free end of the insert pin, so that the embedded part is guided into the limiting portion through the guide portion.

[0007] Optionally, the limiting part is provided with an annular groove, which is arranged around the circumference of the insert pin, and the annular groove is used to provide space for the thermal deformation of the embedded part.

[0008] Optionally, the oblique core-pulling mechanism includes a drive structure and a transmission block connected by transmission. The drive structure drives the transmission block to move linearly. The transmission block has the insert pin on its surface away from the drive structure, so that the insert pin moves linearly along the normal direction of the arc-shaped cavity wall.

[0009] Optionally, a groove is formed on the surface of the transmission block, a T-shaped connector is installed in the groove, the head of the T-shaped connector is held in the groove, and the rod of the T-shaped connector passes through the groove and is connected to the drive structure.

[0010] Optionally, the transmission block has a limiting block mounted on the surface of the insert pin. The limiting block abuts against the mold body to limit the insertion depth of the insert pin in the injection cavity.

[0011] Optionally, the two ends of the transmission block facing away from each other are slidably connected to guide rails, which extend along the normal direction of the arc-shaped cavity wall, so that the insert pin extends into or exits the injection cavity as the transmission block slides between the two guide rails.

[0012] Optionally, the mold body includes a fixed mold and a moving mold, which are arranged opposite to each other to form the injection cavity, and the inclined core-pulling mechanism is installed on the side of the moving mold.

[0013] Optionally, the injection mold includes a plurality of the inclined core-pulling mechanisms, which are spaced apart on the arc-shaped cavity wall to fix the plurality of embedded parts in the molded part of the injection cavity.

[0014] In this invention, the mold body has an injection cavity with an arc-shaped cavity wall. Plastic is injected into the cavity to form an arc-shaped bottom shell. A pin moves through the arc-shaped cavity wall, extending into or exiting the cavity. During injection molding, the pin extends into the cavity along the normal direction of the arc-shaped cavity wall. A nut, as a pre-embedded part, is fitted onto the end of the pin that extends into the cavity, thus ensuring stable installation of the nut within the cavity. The nut is then fixed to the arc-shaped bottom shell formed in the injection cavity. During demolding, the pin moves out of the cavity along the normal direction of the arc-shaped cavity wall, avoiding interference with the nut and facilitating smooth demolding of the arc-shaped bottom shell. This invention achieves stable installation of the nut within the injection cavity while preventing deformation of the arc-shaped bottom shell during demolding, thus meeting the processing requirements of the arc-shaped bottom shell. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of the structure of an injection mold according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the inclined core-pulling mechanism forming the arc-shaped bottom shell;

[0018] Figure 3 for Figure 2 A schematic diagram of the installation nut for the inclined core-pulling mechanism;

[0019] Figure 4 for Figure 3 Schematic diagram of the inclined core-pulling mechanism;

[0020] Figure 5 for Figure 1 Workflow diagram of injection molds;

[0021] Figure 6 for Figure 4 Enlarged structural diagram of part A in the middle.

[0022] Explanation of icon numbers:

[0023] name label name label Angled core pulling mechanism 1000 Annular groove 511a Drive structure 100 Guiding Department 513 Transmission block 300 Limit block 600 chute 300a guide 700 Card slot 300b Embedded parts 2000 T-connector 400 Mold body 3000 head 410 Injection cavity 3000a pole 430 dynamic model 3100 Pin setting 500 arc-shaped cavity wall 3111 Mounting head 510 Fixed mold 3300 Limiting part 511 Arc-shaped bottom shell 5000

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] See Figures 1 to 6As shown, in one embodiment of this utility model, an injection mold includes: a mold body 3000 and an inclined core-pulling mechanism 1000. The mold body 3000 forms an injection cavity 3000a, which has an arc-shaped cavity wall 3111. The inclined core-pulling mechanism 1000 includes a pin 500, which movably passes through the arc-shaped cavity wall 3111. The pin 500 moves along the normal of the arc-shaped cavity wall 3111 to extend into or exit the injection cavity 3000a. The pin 500 is used to install a pre-embedded part 2000 so that the pre-embedded part 2000 is fixed in the molded part of the injection cavity 3000a.

[0028] In the technical solution of this utility model, the mold body 3000 forms an injection cavity 3000a, which has an arc-shaped cavity wall 3111. Injection plastic is added to the injection cavity 3000a with the arc-shaped cavity wall 3111 to form an arc-shaped bottom shell 5000. A pin 500 is movably inserted through the arc-shaped cavity wall 3111, and moves along the normal direction of the arc-shaped cavity wall 3111 to extend into or out of the injection cavity 3000a. During injection molding, the pin 500 moves along the normal direction of the arc-shaped cavity wall 3111 to extend into the injection cavity 3000a. A nut, as a pre-embedded part 2000, is sleeved on the end of the pin 500 that extends into the injection cavity 3000a, thereby achieving stable installation of the nut in the injection cavity 3000a. Thus, after injection molding, the nut is fixed to the arc-shaped bottom shell 5000 formed in the injection cavity 3000a. During demolding, the insert pin 500 moves along the normal direction of the arc-shaped cavity wall 3111 to exit the injection cavity 3000a, thereby avoiding interference from the insert pin 500 on the demolding of the nut, and thus the arc-shaped bottom shell 5000 with the nut fixed thereon can be demolded smoothly. This utility model achieves stable installation of the nut in the injection cavity 3000a while avoiding deformation of the arc-shaped bottom shell 5000 caused by demolding, thus meeting the processing requirements of the arc-shaped bottom shell 5000.

[0029] It should be noted that in this embodiment, the length of the insert pin 500 is set along the normal direction of the arc-shaped cavity wall 3111 through which it passes. The insert pin 500 can be driven by a motor, a hydraulic cylinder, or even manually, as long as it can move along the normal direction of the arc-shaped cavity wall 3111 to extend into or exit the injection cavity 3000a. Preferably, the inclined core pulling mechanism 1000 includes a hydraulic cylinder, and the piston of the hydraulic cylinder is connected to the insert pin 500. The free end of the insert pin 500 is equipped with a pre-embedded part 2000. In this embodiment, the pre-embedded part 2000 can be either a nut or a copper column, as long as the pre-embedded part 2000 can be fitted onto the insert pin 500. For the convenience of explaining the technical effect of this utility model, this utility model is only described using a nut as an example. This embodiment is not limited to this, and all of the above are within the protection scope of this utility model.

[0030] See Figures 1 to 6As shown, in one embodiment of this utility model, the free end of the insert pin 500 is formed with a mounting head 510. The mounting head 510 is used to install the embedded part 2000, so that the embedded part 2000 is fixed to the molded part of the injection cavity 3000a by injection molding. It should be noted that, in this embodiment, through the setting of the mounting head 510, the nut is correspondingly installed on the mounting head 510. The nut is inserted into the injection cavity 3000a through the insert pin 500. In this way, after injection molding, the nut is fixed to the molded part of the arc-shaped bottom shell 5000, thereby realizing the positioning and installation of the nut on the arc-shaped bottom shell 5000. In this embodiment, the nut is sleeved on the mounting head 510, and the gap between the nut and the sleeved mounting head 510 is 0.08~0.12mm. This ensures the coaxiality of the nut and the insert pin 500, while facilitating the demolding of the arc-shaped bottom shell 5000 with the nut fixed on it, and avoiding the deformation of the arc-shaped bottom shell 5000 caused by demolding.

[0031] See Figures 1 to 6 As shown, in one embodiment of this utility model, the mounting head 510 includes a guide portion 513 and a limiting portion 511 arranged sequentially. The guide portion 513 is located at the free end of the insert pin 500, so that the embedded part 2000 is guided into the limiting portion 511 through the guide portion 513. It should be noted that the guide portion 513 in this embodiment can be adjusted according to actual needs. Preferably, the guide angle of the guide portion 513 is 15°. By adjusting the guide angle of the guide portion 513, the nut can be self-aligned. While the nut is smoothly fitted onto the insert pin 500, local glue overflow caused by nut tilting is avoided, ensuring the smooth demolding of the arc-shaped bottom shell 5000. In this embodiment, the nut is smoothly guided into the limiting portion 511 through the guide portion 513, thereby realizing the limiting installation of the nut on the insert pin 500, improving the accuracy of the nut installation position, which is beneficial for the nut to be positioned and implanted into the arc-shaped bottom shell 5000, thus meeting the processing requirements of the arc-shaped bottom shell 5000.

[0032] See Figures 1 to 6 As shown, in one embodiment of this utility model, the limiting part 511 has an annular groove 511a, which surrounds the insert pin 500 circumferentially. The annular groove 511a provides space for the thermal deformation of the embedded part 2000. It should be noted that the depth of the annular groove 511a can be adjusted according to the actual situation of the nut to meet the thermal deformation space of the nut. Preferably, the depth of the annular groove 511a is 0.05mm. By setting the annular groove 511a, this embodiment reserves space for the thermal deformation of the nut, avoiding the nut from squeezing the insert pin 500 due to thermal deformation, thereby avoiding the nut being difficult to demold due to interference from the insert pin 500, which is conducive to the smooth demolding of the arc-shaped bottom shell 5000.

[0033] See Figures 1 to 6As shown, in one embodiment of this utility model, the inclined core-pulling mechanism 1000 further includes a drive structure 100 and a transmission block 300. The drive structure 100 provides the power for linear motion and is connected to the transmission block 300. The transmission block 300 has a pin 500 on its surface away from the drive structure 100, so that the pin 500 moves linearly along the normal direction of the arc-shaped cavity wall 3111. It should be noted that the drive structure 100 in this embodiment can be a hydraulic cylinder, or it can include a motor and a lead screw structure, as long as it can provide the power for linear motion. Preferably, the drive structure 100 is a hydraulic cylinder. The piston of the hydraulic cylinder drives the pin 500 to move linearly through the transmission block 300, so that the pin 500 moves linearly along the normal direction of the arc-shaped cavity wall 3111. The pin 500 extends into or out of the injection cavity 3000a through linear motion, thereby realizing the vertical implantation of the nut in the arc-shaped bottom shell 5000 and avoiding deformation of the arc-shaped bottom shell 5000 caused by interference. In this embodiment, the oblique core-pulling mechanism 1000 includes multiple insert pins 500. The transmission block 300 has multiple sliding grooves 300a on its surface opposite to the drive structure 100. These grooves 300a are arranged side-by-side on the surface of the transmission block 300. The multiple insert pins 500 are slidably mounted on the transmission block 300 via the sliding grooves 300a. The transmission block 300 synchronously drives the multiple insert pins 500 to move along the normal direction of the arc-shaped cavity wall 3111. The multiple insert pins 500 synchronously extend into or retract from the injection cavity 3000a. Each insert pin 500 is fitted with a nut, thus, through injection molding, multiple nuts are fixed to the arc-shaped bottom shell 5000, achieving stable installation of multiple nuts on the arc-shaped bottom shell 5000. This embodiment adjusts the installation position of the insert pins 500 on the transmission block 300 by adjusting the sliding grooves 300a, thereby adjusting the installation position of the nuts on the arc-shaped bottom shell 5000, meeting the processing requirements of different arc-shaped bottom shells 5000.

[0034] See Figures 1 to 6As shown, in one embodiment of the present invention, a groove 300b is formed on the surface of the transmission block 300, a T-shaped connector 400 is installed in the groove 300b, the head 410 of the T-shaped connector 400 is held in the groove 300b, and the rod 430 of the T-shaped connector 400 passes through the groove 300b and is connected to the drive structure 100. It should be noted that in this embodiment, the T-shaped connector 400 has a head 410 and a rod 430 arranged opposite to each other. The head 410 is engaged in the slot 300b of the transmission block 300, and the surface of the head 410 facing away from the rod 430 abuts against the bottom wall of the slot 300b. The rod 430 passes through the slot 300b and is connected to the piston of the hydraulic cylinder. In this way, the hydraulic cylinder realizes stable transmission of the transmission block 300, thereby improving the stability of the linear movement of the transmission block 300. This is beneficial for realizing the normal movement of the insert pin 500 along the arc-shaped cavity wall 3111 to extend into or exit the injection cavity 3000a. In this embodiment, by setting the insert pin 500 and the hydraulic cylinder on the two opposite surfaces of the transmission block 300, the linear movement of the insert pin 500 is ensured, thereby ensuring the concentricity of the nut on the arc-shaped bottom shell 5000.

[0035] See Figures 1 to 6 As shown, in one embodiment of this utility model, a limiting block 600 is installed on the surface of the transmission block 300 where the insert pin 500 is located. The limiting block 600 is used to abut against the mold body 3000 to limit the insertion depth of the insert pin 500 in the injection cavity 3000a. It should be noted that in this embodiment, the limiting block 600 is installed on the surface of the transmission block 300 where the insert pin 500 is located. The limiting block 600 is spaced between the insert pin 500 and the transmission block 300. During injection molding, under the action of the transmission block 300, the insert pin 500 moves along the arc-shaped cavity wall 3111 to extend into the injection cavity 3000a. At the same time, the limiting block 600 gradually approaches the mold body 3000 until it abuts against the mold body 3000. In this way, the limiting block 600 limits the insertion depth of the insert pin 500 in the injection cavity 3000a, thereby accurately positioning the nut in the arc-shaped bottom shell 5000 and ensuring the concentricity of the nut on the arc-shaped bottom shell 5000. Of course, in this embodiment, the limiting block 600 can form an inclined surface at different angles on the surface facing away from the transmission block 300, so as to adapt to different mold bodies 3000 and meet the processing requirements of different arc-shaped bottom shells 5000. This embodiment is not limited to this, and all of the above are within the protection scope of this utility model.

[0036] See Figures 1 to 6As shown, in one embodiment of this utility model, the two ends of the transmission block 300 facing away from each other are slidably connected to guide rails 700. The guide rails 700 extend along the normal direction of the arc-shaped cavity wall 3111, so that the insert pin 500 extends into or exits the injection cavity 3000a as the transmission block 300 slides between the two guide rails 700. It should be noted that in this embodiment, the two ends of the transmission block 300 facing away from each other are slidably connected to the two guide rails 700. Thus, the transmission block 300 slides along the extension direction of the two guide rails 700, and the guide rails 700 extend along the driving direction. This ensures the linear movement of the transmission block 300 along the driving direction, so that the free end of the insert pin 500 extends into or exits the injection cavity 3000a synchronously with the linear movement of the transmission block 300. This facilitates the vertical implantation of the nut into the arc-shaped bottom shell 5000, ensures the concentricity of the nut in the arc-shaped bottom shell 5000, and avoids deformation of the arc-shaped bottom shell 5000 due to interference.

[0037] See Figures 1 to 6 As shown, in one embodiment of this utility model, the mold body 3000 includes a fixed mold 3300 and a moving mold 3100. The fixed mold 3300 and the moving mold 3100 are arranged opposite to each other to form an injection cavity 3000a. A slanted core-pulling mechanism 1000 is installed on the side of the moving mold 3100. It should be noted that in this embodiment, the slanted core-pulling mechanism 1000 is located on the side of the moving mold 3100. In this way, during demolding, the slanted core-pulling mechanism 1000 moves backward synchronously with the moving mold 3100, thereby avoiding interference from the slanted core-pulling mechanism 1000 and avoiding deformation of the arc-shaped bottom shell 5000 caused by interference, thus ensuring smooth demolding of the arc-shaped bottom shell. Of course, in this embodiment, the surface of the moving mold 3100 facing away from the fixed mold 3300 can be provided with a through hole communicating with the injection cavity 3000a. The through hole is used to install an ejector, so that the ejector ejects the arc-shaped bottom shell 5000 formed by the injection cavity 3000a, thereby allowing the arc-shaped bottom shell 5000 to be demolded smoothly. Of course, in this embodiment, the number and position of the through holes can be set as needed to ensure smooth demolding. This embodiment is not limited to this, and all of the above are within the protection scope of this utility model.

[0038] See Figures 1 to 6 As shown, in one embodiment of this utility model, the injection mold includes multiple inclined core-pulling mechanisms 1000, which are spaced apart on the arc-shaped cavity wall 3111 to fix multiple embedded parts 2000 to the molded part in the injection cavity 3000a. It should be noted that this embodiment of the injection mold includes two inclined core-pulling mechanisms 1000, which are positioned opposite each other on the arc-shaped cavity wall 3111. This allows the insert pins 500 of the two inclined core-pulling mechanisms 1000 to move along the normal direction of the arc-shaped cavity wall 3111, thereby synchronously inserting two nuts in different directions into the injection cavity 3000a. This achieves the installation and fixation of nuts in different directions on the arc-shaped bottom shell 5000, thus meeting the different processing requirements of the arc-shaped bottom shell 5000.

[0039] Additional information: The injection molding process based on this injection mold is as follows (see attached image). Figure 5 As shown, in the first step, the hydraulic cylinder drives multiple insert pins 500 to simultaneously extend into the injection cavity 3000a via the transmission block 300; in the second step, nuts are installed on the free ends of the multiple insert pins 500 respectively; in the third step, the mold is closed, and injection molding material is added into the injection cavity 3000a so that the nuts are fixed to the formed arc-shaped bottom shell 5000 through injection molding; in the fourth step, after the injection molding is completed, the hydraulic cylinder drives the multiple insert pins 500 to exit the injection cavity 3000a via the transmission block 300; in the fifth step, the mold is opened, and the formed arc-shaped bottom shell 5000 is ejected.

[0040] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An injection mold, characterized in that, include: The mold body and the inclined core-pulling mechanism are provided. The mold body forms an injection cavity with an arc-shaped cavity wall. The inclined core-pulling mechanism includes a pin that movably passes through the arc-shaped cavity wall. The pin moves along the normal direction of the arc-shaped cavity wall to extend into or retract from the injection cavity. The pin is used to install an embedded part so that the embedded part is fixed in the molded part of the injection cavity.

2. The injection mold of claim 1, wherein, The free end of the insert has a mounting head, which is used to install the embedded part so that the embedded part is fixed in the injection cavity by injection molding.

3. The injection mold of claim 2, wherein, The mounting head includes a guide portion and a limiting portion arranged in sequence. The guide portion is located at the free end of the insert pin so that the embedded part is guided into the limiting portion through the guide portion.

4. The injection mold of claim 3, wherein The limiting part has an annular groove, which is arranged around the circumference of the insert pin. The annular groove is used to provide space for the thermal deformation of the embedded part.

5. Injection mold according to any one of claims 1 to 4, characterized in that The oblique core-pulling mechanism includes a drive structure and a transmission block connected by transmission. The drive structure drives the transmission block to move linearly. The transmission block has the insert pin on its surface away from the drive structure, so that the insert pin moves linearly along the normal direction of the arc-shaped cavity wall.

6. The injection mold of claim 5, wherein, The surface of the transmission block has a slot, and a T-shaped connector is installed in the slot. The head of the T-shaped connector is held in the slot, and the rod of the T-shaped connector passes through the slot and is connected to the drive structure.

7. The injection mold of claim 5, wherein, The transmission block has a limiting block mounted on the surface of the insert pin. The limiting block abuts against the mold body to limit the insertion depth of the insert pin in the injection cavity.

8. The injection mold of claim 5, wherein, The transmission block is slidably connected to guide rails at its two opposite ends. The guide rails extend along the normal direction of the arc-shaped cavity wall so that the insert pin extends into or exits the injection cavity as the transmission block slides between the two guide rails.

9. The injection mold of any one of claims 1 to 4, wherein, The mold body includes a fixed mold and a moving mold, which are arranged opposite to each other to form the injection cavity. The inclined core-pulling mechanism is installed on the side of the moving mold.

10. Injection mold according to any one of claims 1 to 4, characterized in that The injection mold includes multiple inclined core-pulling mechanisms, which are spaced apart on the arc-shaped cavity wall to fix multiple embedded parts to the molded part in the injection cavity.

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