Die ejector pin with replaceable pin core

Abstract

The utility model discloses a mould ejector pin with a replaceable pin core, which relates to the technical field of moulds, aims to solve the technical problem that the connection form of the current mould ejector pin with the replaceable pin core is easy to loosen or easy to seep and block, and comprises a main body part and a pin core part. According to the utility model, the mounting screw hole arranged at the bottom of the mounting cavity of the main body part is trapezoidal, the thread angle is 50-60 degrees, and the matched thread screwing-in end and the trapezoidal mounting screw hole with the thread angle of 50-60 degrees are correspondingly arranged at the bottom of the mounting end of the needle core part; the angle range can enable the thread to generate larger friction force when the thread is stressed, when the needle core part and the main body part are connected and tightened through the trapezoidal mounting screw hole and the thread screwing-in end, the friction force between the thread tooth side faces is increased, the thread can be effectively prevented from relatively rotating under the action of vibration and impact, and therefore the anti-loosening purpose is achieved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to a mold ejector pin with a replaceable core. Background Technology

[0002] In the mold production process, ejector pins are a commonly used component used to eject the molded product from the mold cavity. When the pin core wears or is damaged due to long-term use, the entire ejector pin needs to be replaced. This not only increases production costs, but also makes the replacement process cumbersome and affects production efficiency. In view of this situation, ejector pins are usually designed with replaceable pin cores.

[0003] In existing mold ejector pins with replaceable cores, the core and the body are usually connected by a single thread or a snap-fit ​​connection. When using a single thread to connect the core and the body, high-frequency vibration during injection molding can easily cause the thread pair to loosen, or even cause the core to fall into the mold cavity, resulting in a serious accident. When using a snap-fit ​​connection, the gap (usually ≥0.3mm) is easily penetrated by molten material, which forms a hard insert after cooling, causing the ejector pin to jam and become impossible to remove. Therefore, we propose a mold ejector pin with a replaceable core. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a mold ejector pin with a replaceable needle core, so as to solve the technical problems of easy loosening or easy material leakage and jamming in the connection form of the current mold ejector pin with a replaceable needle core.

[0005] To solve the above technical problems, this utility model provides the following technical solution: a mold ejector pin with replaceable needle core, comprising a main body and a needle core, wherein the needle core is arranged on the main body, a mounting cavity is provided at the top center of the main body, and the bottom of the mounting cavity is a mounting screw hole, wherein the mounting screw hole is trapezoidal, the thread angle of the mounting screw hole is 50°-60°, and a mounting end is arranged at the bottom of the needle core, wherein the bottom of the mounting end is a threaded end, and the threaded end matches the size of the mounting screw hole;

[0006] The mounting screw hole includes a threaded bottom section and a threaded top section, with the threaded top section on top and the threaded bottom section on the bottom. The connection between the threaded bottom section and the threaded top section is a rounded transition.

[0007] Preferably, the top opening of the mounting cavity is provided with a flared opening, and a sealing ring is arranged inside the flared opening, and both the flared opening and the sealing ring are T-shaped.

[0008] Preferably, an annular storage trough is provided around the circumference of the mounting end corresponding to the flared opening.

[0009] Preferably, a pressure ring is arranged on the top of the mounting end, and the pressure ring is hexagonal.

[0010] Preferably, the pitch P of the mounting screw hole is 1.5mm-2mm.

[0011] Preferably, the thread angle of the top section is 60° and the thread has 3-5 teeth, and the thread angle of the bottom section is 50° and the thread has 2-3 teeth.

[0012] Preferably, the thread root depth of the top section is set to 0.8P, and the thread root depth of the bottom section is set to 1.2P.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model features a trapezoidal mounting screw hole at the bottom of the mounting cavity of the main body, with a thread angle of 50°-60°. A matching threaded insertion end is also provided at the bottom of the mounting end of the needle core. Compared to ordinary triangular threads (60° thread angle), this angle range allows the thread to generate greater friction under stress. When the needle core and the main body are connected and tightened through the trapezoidal mounting screw hole and the threaded insertion end, the friction between the thread facets increases, effectively preventing relative rotation of the thread under vibration and impact, thus achieving the purpose of preventing loosening. This solves the technical problem of easy loosening or material leakage and jamming in the connection form of current replaceable needle core mold ejector pins. Therefore, this utility model has the advantage of preventing loosening.

[0015] 2. The trapezoidal mounting screw hole of this utility model is divided into a threaded bottom section and a threaded top section. The threaded top section has a thread profile angle of 60° and 3-5 threads, which facilitates the quick screwing in of the threaded end of the pin core mounting part for centering. The threaded bottom section has a thread profile angle of 50° and 2-3 threads, which can further increase the contact area and improve the anti-loosening friction, thereby achieving a better anti-loosening effect. Moreover, the thread root depth of the threaded top section is set to 0.8P (pitch), and the thread root depth of the threaded bottom section is set to 1.2P (pitch). By gradually dispersing the stress concentration during tightening through the depth change, the impact resistance can be greatly improved, thereby further ensuring the anti-loosening effect and impact resistance of the trapezoidal mounting screw hole and its matching threaded end for connection and installation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the main body structure of this utility model;

[0018] Figure 3 This is a schematic cross-sectional view of the main body of this utility model;

[0019] Figure 4 This is a schematic diagram of the needle core structure of this utility model.

[0020] Explanation of the labels in the diagram:

[0021] 1. Main body; 2. Needle core; 201. Mounting end; 202. Threaded screw-in end; 203. Annular storage groove; 204. Pressure ring; 3. Mounting cavity; 301. Flared opening; 302. Sealing ring; 4. Mounting screw hole; 401. Thread bottom section; 402. Thread top section. Detailed Implementation

[0022] like Figures 1 to 4 As shown, this utility model relates to a replaceable core mold ejector pin, including a main body 1 and a core part 2. The core part 2 is arranged on the main body 1. A mounting cavity 3 is provided in the center of the top of the main body 1, and the bottom of the mounting cavity 3 is a mounting screw hole 4. The mounting screw hole 4 is trapezoidal and the thread angle of the mounting screw hole 4 is 50°-60°. A mounting end 201 is arranged at the bottom of the core part 2, and the bottom of the mounting end 201 is a threaded screw-in end 202. The threaded screw-in end 202 matches the size of the mounting screw hole 4. A flared opening 301 is provided at the top of the mounting cavity 3, and a sealing ring 302 is arranged inside the flared opening 301. Both the flared opening 301 and the sealing ring 302 are T-shaped.

[0023] The connection and installation of the main body 1 and the needle core 2 are achieved by screwing the threaded end 202 of the mounting end 201 of the needle core 2 into the mounting screw hole 4 of the mounting cavity 3 of the main body 1, thereby realizing the replaceability of the needle core 2. Moreover, when the trapezoidal mounting screw hole 4 with a tooth angle of 50°-60° is connected and tightened with the threaded end 202 of the corresponding size, it can generate greater friction when the thread is under force. The increased friction between the thread tooth sides can effectively prevent the thread from rotating relative to each other under vibration and impact, thereby achieving the purpose of anti-loosening. After the main body 1 and the needle core 2 are connected and installed, the sealing ring 302 in the T-shaped flared end 301 can also play an effective sealing role to prevent the molten liquid from seeping in.

[0024] Specifically, an annular storage groove 203 is provided around the circumference of the mounting end 201 and the flared end 301; when a small amount of material seeps into the gap, it can be intercepted by the annular storage groove 203 to prevent it from entering the threaded connection area.

[0025] Furthermore, a pressure ring 204 is arranged on the top of the mounting end 201, and the pressure ring 204 is hexagonal; the pressure ring 204 serves two purposes: firstly, it compresses the sealing ring 302 to ensure the sealing effect of the sealing ring 302; secondly, the hexagonal shape of the pressure ring 204 makes it easy for personnel to screw it onto the needle core part 2 using tools.

[0026] It is worth noting that the pitch P of the mounting screw hole 4 is 1.5mm-2mm; the selection of a pitch of 1.5mm-2mm for the trapezoidal mounting screw hole 4 is a comprehensive consideration of both the anti-loosening effect and the convenience of installation and disassembly. A smaller pitch means a finer thread, and under the same tightening torque, the contact area between the threads is larger, and the friction is correspondingly increased, which helps to improve the anti-loosening performance. At the same time, a suitable pitch will not make the installation and disassembly process too cumbersome, ensuring that the operation can be completed quickly when the needle core needs to be replaced.

[0027] In an embodiment of this utility model, the mounting screw hole 4 includes a threaded bottom section 401 and a threaded top section 402, with the threaded top section 402 on top and the threaded bottom section 401 on the bottom. The connection between the threaded bottom section 401 and the threaded top section 402 is a rounded transition. The thread profile angle of the threaded top section 402 is 60°, and the thread has 3-5 teeth. The thread profile angle of the threaded bottom section 401 is 50°, and the thread has 2-3 teeth. The thread root depth of the threaded top section 402 is set to 0.8P, and the thread root depth of the threaded bottom section 401 is set to 1.2P.

[0028] The top section 402 of the thread facilitates the quick screwing in and centering of the threaded end 202 of the mounting end 201 of the needle core 2. The bottom section 401 of the thread can further increase the contact area and improve the anti-loosening friction, thereby achieving a better anti-loosening effect. The mounting screw hole 4 disperses the stress concentration during tightening through the gradual change in depth, and the impact resistance can be greatly improved. This can further ensure the anti-loosening effect and impact resistance of the trapezoidal mounting screw hole 4 and its matching threaded end 202 when connected and installed.

[0029] Working principle: This embodiment provides a mold ejector pin with a replaceable needle core. First, the connection and installation of the main body 1 and the needle core 2 are achieved by screwing the threaded end 202 of the mounting end 201 of the needle core 2 into the mounting screw hole 4 of the mounting cavity 3 of the main body 1, thereby realizing the replaceability of the needle core 2. Moreover, when the trapezoidal mounting screw hole 4 with a tooth angle of 50°-60° is connected and tightened with the threaded end 202 of the corresponding size, the thread can generate greater friction when under force. The increased friction between the thread tooth sides can effectively prevent the thread from rotating relative to each other under vibration and impact, thereby achieving the purpose of anti-loosening. After the main body 1 and the needle core 2 are connected and installed, the sealing ring 302 in the T-shaped flared end 301 can also play an effective sealing role. When a small amount of material seeps into the gap, it can be intercepted by the annular storage groove 203 to prevent it from entering the threaded connection area, thereby preventing the molten liquid from seeping in.

[0030] Secondly, the threaded top section 402 in the mounting screw hole 4 facilitates the quick screwing in of the threaded screw-in end 202 of the mounting end 201 of the needle core 2, and the threaded bottom section 401 can further increase the contact area and improve the anti-loosening friction, thereby achieving a better anti-loosening effect. The mounting screw hole 4 disperses the stress concentration during tightening through a gradual depth change, and the impact resistance can be greatly improved, thereby further ensuring the anti-loosening effect and impact resistance of the trapezoidal mounting screw hole 4 and its matching threaded screw-in end 202 when connected and installed.

[0031] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A mold pin with replaceable pin core, characterized by, Including the main part (1) and needle core (2), the needle core (2) is arranged on the main part (1), the top of the main part (1) is provided with installation cavity (3), and the bottom of the installation cavity (3) is provided with installation screw hole (4), and the installation screw hole (4) is trapezoidal, the tooth type angle of the installation screw hole (4) is 50°-60°, the bottom of the needle core (2) is provided with installation end (201), and the bottom of the installation end (201) is screwed into the end (202), the threaded end (202) is matched with the size of the installation screw hole (4); The installation screw hole (4) includes a threaded bottom section (401) and a threaded top section (402), and the threaded top section (402) is below the threaded bottom section (401), and the threaded bottom section (401) and the threaded top section (402) are connected by a circular arc transition.

2. The mold pin with replaceable pin core according to claim 1, wherein, The top of the installation cavity (3) is provided with an expanding hole (301), and the expanding hole (301) is provided with a sealing ring (302) inside, and the expanding hole (301) and the sealing ring (302) are both T-shaped.

3. The mold pin of claim 2, wherein, The installation end (201) is provided with an annular storage groove (203) corresponding to the expanding hole (301).

4. The mold pin of claim 1, wherein, The top of the installation end (201) is provided with a pressing ring (204), and the pressing ring (204) is hexagonal.

5. The mold pin of claim 1, wherein, The installation screw hole (4) has a pitch P of 1.5mm-2mm.

6. The mold pin of claim 1, wherein, The tooth type angle of the threaded top section (402) is 60°, the thread is provided with 3-5 teeth, the tooth type angle of the threaded bottom section (401) is 50°, and the thread is provided with 2-3 teeth.

7. The mold pin of claim 1, wherein, The threaded top section (402) is provided with a tooth bottom depth of 0.8P, and the threaded bottom section (401) is provided with a tooth bottom depth of 1.2P.

Images