A secondary injection molding pre-embedded insert positioning structure

Abstract

This utility model discloses a pre-embedded insert positioning structure for secondary injection molding, including an upper mold base and a lower mold base. Guide rods are installed at the four corners of the upper mold base, and guide grooves for inserting the guide rods are provided at the four corners of the lower mold base. Each guide rod includes a fixed rod and a sliding cylinder. An inner rod is provided at the bottom of the fixed rod, with a diameter smaller than that of the fixed rod. The sliding cylinder is sleeved and slidably connected to the outer side of the inner rod. A fixed plate is provided at one end of the inner rod inside the sliding cylinder. A spring is provided between the fixed plate and the bottom of the inner cavity of the sliding cylinder. A pressure sensor is provided between the fixed plate and the spring. The pressure sensor is electrically connected to an external control system. In this utility model, when the guide rod and guide groove are not aligned, the sliding cylinder compresses the spring to buffer the misalignment and trigger the pressure sensor. The pressure sensor transmits a signal to the external control system to trigger an alarm, thereby avoiding rigid collisions and prompting the operator to correct the misalignment in a timely manner, protecting the mold and extending its service life.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically a secondary injection pre-embedded insert positioning structure. Background Technology

[0002] Injection molds are crucial tools for the mass production of plastic products. They are used to inject molten plastic into a cavity, which then cools and solidifies to obtain the desired product shape. Typically made of steel or aluminum alloy, they consist of two main parts: a moving mold and a fixed mold, and include core components such as a gating system, ejection mechanism, and cooling system. Injection molds are characterized by high efficiency, high precision, and strong repeatability, and are widely used in the automotive, electronics, home appliance, and medical industries. They are a core technology for achieving large-scale production of plastic products, and their design and manufacturing level directly affects product quality and production costs.

[0003] Existing injection molds typically have guide rods installed at the four corners of the upper mold base, and corresponding guide grooves set at the corresponding positions of the lower mold base. When the mold is closed, the guide rods are inserted into the guide grooves to achieve alignment and guidance of the upper and lower molds, ensuring the accuracy of mold closure.

[0004] However, in actual production, if there is a positional deviation between the upper mold base and the lower mold base in the early stage of mold closing, the guide rod will be misaligned with the guide hole, causing the guide rod to directly hit the lower mold base. This will lead to deformation of the guide rod or damage to the mold body, thereby shortening the service life of the injection mold. Utility Model Content

[0005] The purpose of this utility model is to provide a secondary injection molding pre-embedded insert positioning structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A secondary injection molding pre-embedded insert positioning structure includes an upper mold base and a lower mold base. Guide rods are installed at each of the four corners of the upper mold base, and guide grooves for inserting the guide rods are provided at each of the four corners of the lower mold base. Each guide rod includes a fixed rod and a sliding cylinder. An inner rod is provided at the bottom of the fixed rod, and the diameter of the inner rod is smaller than the diameter of the fixed rod. The sliding cylinder is sleeved and slidably connected to the outer side of the inner rod. A fixed plate is provided at one end of the inner rod inside the sliding cylinder. A spring is provided between the fixed plate and the bottom of the inner cavity of the sliding cylinder. A pressure sensor is provided between the fixed plate and the spring. One end of the spring abuts against the pressure sensor, and the other end abuts against the bottom of the inner cavity of the sliding cylinder. The pressure sensor is electrically connected to an external control system.

[0008] Furthermore, the slide cylinder includes an upper cylinder and a lower cylinder that are threaded together, with the upper cylinder slidably connected to the inner rod.

[0009] Furthermore, after the upper mold base and the lower mold base are closed, a cavity is formed. The cavity is used to place the product to be injection molded a second time. The product has a first protrusion, a second protrusion and a third protrusion on its inner side. The first protrusion, the second protrusion and the third protrusion are all provided with slots. The height of the first protrusion and the slot on it is greater than the height of the second protrusion and the third protrusion and the slot on it. The cavity is provided with slots for the second protrusion and the third protrusion to be inserted into, and a recess for the first protrusion to be inserted into. An insert is inserted into the recess. The insert is provided with a snap-fit ​​part that matches the slot on the first protrusion.

[0010] Furthermore, all four sides of the insert are inclined surfaces, and the lower mold base is provided with an ejection mechanism for ejecting the product and the insert.

[0011] Furthermore, the inclination angle of the four inclined planes is 91°.

[0012] Furthermore, the ejection mechanism includes a top plate movably connected to the bottom of the lower mold base, and a plurality of ejector pins are fixedly installed on the top plate, with the upper end surfaces of the plurality of ejector pins respectively abutting against the lower end surfaces of the product and the insert.

[0013] Furthermore, the lower mold base and the upper mold base are each provided with four positioning pins, and the lower mold base and the upper mold base are each provided with four positioning holes for the corresponding positioning pins to be inserted.

[0014] The beneficial effects of this utility model are:

[0015] If the guide rod is not accurately aligned with the guide groove, the bottom end of the slide cylinder will first contact the upper surface of the lower mold base. As the upper mold base continues to move, the slide cylinder will slide inward towards the rod, compressing the spring. This avoids rigid collisions and damage caused by misalignment of the guide rod and guide groove, allowing the operator sufficient time to stop mold closing and protecting the mold. At the same time, the spring will apply a gradually increasing thrust to the pressure sensor during compression. By pre-setting the alarm threshold of the pressure sensor, when the detected pressure exceeds the set value, the control system can immediately issue a warning signal or even automatically stop the mold closing action, prompting the operator to check the alignment of the upper and lower mold bases, preventing carelessness in noticing, timely troubleshooting, ensuring safe mold operation, and extending the mold's service life.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] Figure 1 : Overall structural diagram of this utility model.

[0018] Figure 2 The explosion of this utility model Figure 1 .

[0019] Figure 3 The explosion of this utility model Figure 2 .

[0020] Figure 4 : Cross-sectional view of the guide rod structure of this utility model.

[0021] Figure 5 : Product structure diagram of this utility model.

[0022] Figure 6 : A diagram of the block structure of this utility model.

[0023] Figure 7 : Cross-sectional view of the hole in this utility model.

[0024] Reference numerals: 1. Upper mold base; 2. Lower mold base; 3. Guide rod; 4. Cavity; 5. Product; 6. Insert; 7. Ejection mechanism; 8. Positioning pin; 9. Positioning hole; 21. Guide groove; 31. Fixing rod; 32. Inner rod; 33. Slide cylinder; 34. Fixing plate; 35. Spring; 36. Pressure sensor; 37. Upper cylinder; 38. Lower cylinder; 41. Slot; 42. Insertion hole; 51. First protrusion; 52. Second protrusion; 53. Third protrusion; 54. Slot; 61. Inclined surface; 62. Snap-fit ​​part; 71. Top plate; 72. Ejector pin. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] Please refer to Figure 1-7 ;

[0027] A pre-embedded insert positioning structure for secondary injection molding includes an upper mold base 1 and a lower mold base 2. Guide rods 3 are installed at each of the four corners of the upper mold base 1, and guide grooves 21 for inserting the guide rods 3 are provided at each of the four corners of the lower mold base 2. During mold closing and opening, the guide rods 3 slide along the guide grooves 21 to guide the upper and lower mold bases 2, ensuring accuracy and smoothness of movement during mold closing and opening. Specifically, the guide rods 3 include a fixed rod 31 and a sliding cylinder 33. An inner rod 32 is provided at the bottom of the fixed rod 31, and the inner rod 32 is integrally formed with the fixed rod 31. The diameter is smaller than that of the fixed rod 31. The slide cylinder 33 is sleeved and slidably connected to the outside of the inner rod 32. The inner rod 32 is provided with a fixed plate 34 at one end inside the slide cylinder 33 to prevent the slide cylinder 33 from detaching from the inner rod 32. A spring 35 is provided between the fixed plate 34 and the bottom of the inner cavity of the slide cylinder 33. A pressure sensor 36 is provided between the fixed plate 34 and the spring 35. One end of the spring 35 abuts against the pressure sensor 36, and the other end abuts against the bottom of the inner cavity of the slide cylinder 33. The pressure sensor 36 is electrically connected to an external control system (not shown in the figure) and can sense the change in pressure on the spring 35 in real time.

[0028] During the mold closing process, the operator can judge whether the upper mold base 1 and the lower mold base 2 are aligned by observing the alignment of the guide rod 3 and the guide groove 21. If the guide rod 3 is not accurately aligned with the guide groove 21, the bottom end of the slide cylinder 33 will first contact the upper surface of the lower mold base 2. As the upper mold base 1 continues to move, the slide cylinder 33 will slide towards the inner rod 32, compressing the spring 35. This avoids rigid collisions and damage caused by the misalignment of the guide rod 3 and the guide groove 21, providing the operator with sufficient reaction time to stop the mold closing and protect the mold safety. At the same time, the spring 35 will apply a gradually increasing thrust to the pressure sensor 36 during the compression process. By pre-setting the alarm threshold of the pressure sensor 36, when the detected pressure exceeds the set value, the control system can immediately issue a warning signal or even automatically stop the mold closing action, prompting the operator to check the alignment of the upper mold base 1 and the lower mold base 2, preventing the failure to detect misalignment problems in time due to negligence, eliminating faults in time, ensuring the safe operation of the mold, and extending the service life of the mold.

[0029] Furthermore, the slide cylinder 33 adopts a split structure, including an upper cylinder 37 and a lower cylinder 38 connected by threads, with the upper cylinder 37 slidably connected to the inner rod 32. When it is necessary to inspect, maintain, or replace the pressure sensor 36 or the spring 35, the disassembly operation can be completed simply by unscrewing the lower cylinder 38, which improves the convenience of maintenance and reduces maintenance costs.

[0030] In this embodiment, after the upper mold base 1 and the lower mold base 2 are closed, a cavity 4 is formed. The cavity 4 is used to place the product 5 to be injected into the secondary mold. The product 5 has a first protrusion 51, a second protrusion 52 and a third protrusion 53 on its inner side. The first protrusion 51, the second protrusion 52 and the third protrusion 53 are all provided with slots 54. The height of the first protrusion 51 and the slots 54 on it is greater than the height of the second protrusion 52 and the third protrusion 53 and the slots 54 on it. The cavity 4 is provided with slots 41 for the second protrusion 52 and the third protrusion 53 to be inserted, and a recess 42 for the first protrusion 51 to be inserted. An insert 6 is inserted into the recess 42. The insert 6 is provided with a snap-fit ​​part 62 that matches the slot 54 on the first protrusion 51. Before installing product 5 into cavity 4, insert 6 must be placed inside the first protrusion 51 and the snap-fit ​​part 62 on insert 6 must engage with the snap-fit ​​groove 54 of the first protrusion 51 to complete the pre-assembly of product 5 and insert 6. Then insert 6 is inserted into the insert hole 42. After insert 6 is installed, product 5 will be fixed on cavity 4, thereby realizing the rapid assembly and fixation of product 5 and improving work efficiency.

[0031] In this embodiment, all four sides of the insert 6 are inclined surfaces 61. The lower mold base 2 is provided with an ejection mechanism 7 for ejecting the product 5 and the insert 6. Preferably, the inclination angle of the four inclined surfaces 61 is 91°, that is, slightly inclined outward. The design of the inclined surfaces 61 plays a guiding role in the assembly process. When the insert 6 is inserted into the insertion hole 42, the inclined surfaces 61 can guide it to slide in smoothly, reducing assembly deviation. At the same time, during the ejection process, the structure of the inclined surfaces 61 helps to reduce the frictional resistance between the insert 6 and the insertion hole 42, prevents the insert 6 from getting stuck in the insertion hole 42, and ensures that the ejection action is smooth and reliable. The insert 6 can be reused after it is ejected.

[0032] In this embodiment, the ejection mechanism 7 includes a top plate 71 movably connected to the bottom of the lower mold base 2. A plurality of ejector pins 72 are fixedly mounted on the top plate 71, and the upper end faces of the ejector pins 72 respectively abut against the lower end faces of the product 5 and the insert 6. After the mold is opened, the top plate 71 is pushed toward the product 5 by an external ejection device (not shown in the figure). When the top plate 71 moves, it drives the ejector pins 72 to move synchronously, thereby ejecting the product 5 and the insert 6 together.

[0033] In this embodiment, the lower mold base 2 and the upper mold base 1 are each provided with four positioning pins 8, and the lower mold base 2 and the upper mold base 1 are each provided with four positioning holes 9 for the corresponding positioning pins 8 to be inserted. During the mold closing process, the positioning pins 8 on the lower mold base 2 and the upper mold base 1 are respectively inserted into the corresponding positioning holes 9 to achieve high-precision centering and positioning, preventing the cavity 4 from deviating due to misalignment of the upper mold base 1 and the lower mold base 2, thereby avoiding defects such as flash, material shortage, uneven wall thickness, and out-of-tolerance dimensions during injection molding, and ensuring the quality and consistency of the finished product.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A secondary injection molding pre-embedded insert positioning structure, comprising an upper mold base (1) and a lower mold base (2), wherein guide rods (3) are installed at each of the four corners of the upper mold base (1), and guide grooves (21) for inserting the guide rods (3) are provided at each of the four corners of the lower mold base (2), characterized in that, The guide rod (3) includes a fixed rod (31) and a slide cylinder (33). The bottom of the fixed rod (31) is provided with an inner rod (32). The diameter of the inner rod (32) is smaller than the diameter of the fixed rod (31). The slide cylinder (33) is sleeved and slidably connected to the outside of the inner rod (32). One end of the inner rod (32) located inside the slide cylinder (33) is provided with a fixed plate (34). A spring (35) is provided between the fixed plate (34) and the bottom of the inner cavity of the slide cylinder (33). A pressure sensor (36) is provided between the fixed plate (34) and the spring (35). One end of the spring (35) abuts against the pressure sensor (36), and the other end abuts against the bottom of the inner cavity of the slide cylinder (33). The pressure sensor (36) is electrically connected to an external control system.

2. A pre-molded insert positioning structure of a two-shot injection molding according to claim 1, wherein The slide cylinder (33) includes an upper cylinder (37) and a lower cylinder (38) connected by threads, and the upper cylinder (37) is slidably connected to the inner rod (32).

3. A pre-molded insert positioning structure of a two-shot injection molding according to claim 1, wherein After the upper mold base (1) and the lower mold base (2) are closed, a cavity (4) is formed. The cavity (4) is used to place the product (5) to be injection molded a second time. The product (5) has a first protrusion (51), a second protrusion (52) and a third protrusion (53) on its inner side. The first protrusion (51), the second protrusion (52) and the third protrusion (53) are all provided with slots (54). The height of the first protrusion (51) and its slots (54) is greater than that of the product. The height of the second protrusion (52) and the third protrusion (53) and their slots (54), the cavity (4) is provided with slots (41) for the second protrusion (52) and the third protrusion (53) to be inserted, and a recess (42) for the first protrusion (51) to be inserted. An insert (6) is inserted into the recess (42), and the insert (6) is provided with a snap-fit ​​part (62) that matches the slot (54) on the first protrusion (51).

4. A pre-molded insert positioning structure of a two-shot injection molding according to claim 3, wherein The four sides of the insert (6) are all inclined surfaces (61), and the lower mold base (2) is provided with an ejection mechanism (7) for ejecting the product (5) and the insert (6).

5. A pre-molded insert positioning structure of a two-shot injection molding according to claim 4, wherein The inclination angle of the four inclined planes (61) is 91°.

6. A pre-molded insert positioning structure of a two-shot injection molding according to claim 4, wherein The ejection mechanism (7) includes a top plate (71) movably connected to the bottom of the lower mold base (2). A plurality of ejector pins (72) are fixedly installed on the top plate (71), and the upper end surfaces of the plurality of ejector pins (72) respectively abut against the lower end surfaces of the product (5) and the insert (6).

7. A pre-molded insert positioning structure of a two-shot injection molding according to claim 1, wherein The lower mold base (2) and the upper mold base (1) are each provided with four positioning pins (8), and the lower mold base (2) and the upper mold base (1) are each provided with four positioning holes (9) for the corresponding positioning pins (8) to be inserted.

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