High-efficiency exhaust structure of plastic mold

Abstract

The utility model discloses a kind of plastic mould high-efficiency exhaust structure, including upper die plate and lower die plate, the center of upper die plate and lower die plate is equipped with the communicating mounting hole, mounting hole is used for embedding mould core component to realize the injection molding of melt, and the outer periphery of lower die plate located mounting hole is equipped with exhaust ring groove, lower die plate is equipped with the exhaust port in communication with exhaust ring groove in four directions, and several sawtooth protrusions are spaced apart in four exhaust ports, the bottom of upper die plate is equipped with sawtooth groove corresponding four direction positions with sawtooth protrusion, and sawtooth protrusion and sawtooth groove are formed into continuous exhaust passage by non-contact type inlaying between, the utility model is inlaid by non-contact mode with sawtooth protrusion and sawtooth groove, forms continuous exhaust passage, can realize the flow of gas, to effectively increase exhaust area in limited mould space, extend gas flow path, improve the stability of exhaust process, to improve the forming quality of plastic product.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic molds, specifically a high-efficiency venting structure for plastic molds. Background Technology

[0002] A plastic mold consists of two parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, and the fixed mold is mounted on the fixed platen. During injection molding, the moving and fixed molds close to form the gating system and the cavity. When the mold opens, the moving and fixed molds separate to remove the plastic product. The venting structure is a channel-shaped vent in the mold used to expel existing gases and gases introduced by the molten material. When the molten material is injected into the cavity, the air already present in the cavity and the gases introduced by the melt must be expelled from the mold through the vent at the end of the material flow. Otherwise, the product will have air pockets, incomplete filling, or even burns due to the high temperature generated by the compressed air.

[0003] However, existing injection molds have poor venting performance. When filling molten material at high speed, it is difficult to expel air from the mold in a timely and efficient manner, which can lead to trapped air and scorching during injection molding, affecting product quality. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency venting structure for plastic molds to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-efficiency venting structure for plastic molds includes an upper mold plate and a lower mold plate. The upper mold plate and the lower mold plate have a connecting mounting hole at their center. The mounting hole is used to insert a mold core assembly to achieve injection molding of molten material. The lower mold plate has a venting ring groove on the outer periphery of the mounting hole. The lower mold plate has venting ports in four directions that communicate with the venting ring groove. Each of the four venting ports has a number of serrated protrusions spaced apart. The bottom of the upper mold plate has serrated grooves at the corresponding four directions that are adapted to the serrated protrusions. The serrated protrusions and serrated grooves form a continuous venting channel through non-contact interlocking.

[0007] Furthermore, the exhaust ring groove includes a primary ring groove and a secondary ring groove. The primary ring groove is arranged around the mounting hole and communicates with the mounting hole. The secondary ring groove is arranged around the outside of the primary ring groove and communicates with the primary ring groove. The secondary ring groove is provided with a number of diversion grooves at intervals in the circumferential direction. The secondary ring groove is connected to four exhaust ports respectively through the number of diversion grooves.

[0008] Furthermore, the depth of the secondary annular groove is greater than that of the primary annular groove.

[0009] Furthermore, the depth of the primary annular groove is less than the overflow value of the injection molten material.

[0010] Furthermore, the bottom of the secondary annular groove is provided with four movable holes, which are respectively located in the four directions of the secondary annular groove. The four side walls of the lower template are provided with auxiliary venting holes in the horizontal direction, and the four auxiliary venting holes are respectively connected to the corresponding movable holes.

[0011] Furthermore, a locking pin is threaded to the bottom of the movable hole, a spring is abutted to the top of the locking pin, and a movable rod is abutted to the other end of the spring. A limiting ring is provided at the top of the movable hole, and the upper end face of the movable rod abuts against the lower end face of the limiting ring. The side wall of the movable rod blocks one end of the auxiliary exhaust hole.

[0012] The beneficial effects of this utility model are:

[0013] When the molten material is injected into the plastic mold at high speed, the air inside the mold is first squeezed into the venting ring groove, and then diverted to the venting ports in four directions. In the venting ports, the gas flows through the non-contact interlocking of the serrated protrusions and serrated grooves to form a continuous venting channel, and finally is discharged outside the mold. Through the guiding effect of the serrated structure, the venting area can be increased in the limited space of the mold, the gas flow path can be extended, the stability of the venting process can be ensured, and the molding quality of the plastic product can be improved.

[0014] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0015] Figure 1 : Overall structural diagram of this utility model.

[0016] Figure 2 The explosion of this utility model Figure 1 .

[0017] Figure 3 The explosion of this utility model Figure 2 .

[0018] Figure 4 : A cross-sectional view of this utility model.

[0019] Figure 5 : Figure 4 Enlarged view of the structure of part A.

[0020] Figure 6 Figure 1 shows an overall structural diagram of another embodiment of this utility model.

[0021] Figure 7 Figure 1: A cross-sectional view of another embodiment of this utility model. Detailed Implementation

[0022] 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.

[0023] Please refer to Figure 1-7 ;

[0024] A high-efficiency venting structure for plastic molds includes an upper mold plate 1 and a lower mold plate 2. The upper mold plate 1 and the lower mold plate 2 have a centrally connected mounting hole 3 for inserting a mold core assembly (not shown) to achieve injection molding of the molten material. The lower mold plate 2 has a venting ring groove 4 on the outer periphery of the mounting hole 3. The lower mold plate 2 has venting ports 5 in four directions that communicate with the venting ring groove 4. When high-speed molten material is injected into the mold, gas can enter the venting ports 5 through the venting ring groove 4 and be discharged to the outside of the mold from the venting ports 5. Each of the four venting ports 5 has several serrated protrusions 6 spaced apart. The bottom of the upper mold plate 1 has serrated grooves 7 at corresponding positions in the four directions that correspond to the serrated protrusions 6. The serrated protrusions 6 and the serrated grooves 7 form a continuous venting channel 8 through non-contact interlocking. Since the top and sides of each serration become venting points, the total effective venting edge length of this structure is greater than that of a traditional straight venting structure, thus providing a larger gas flow cross-sectional area during high-speed injection molding.

[0025] Working principle: When the molten material is injected into the plastic mold at high speed, the air inside the mold is first squeezed into the venting ring groove 4, and then diverted to the venting ports 5 in four directions. In the venting ports 5, the gas flows through the non-contact interlocking of the serrated protrusions 6 and serrated grooves 7 to form a continuous venting channel 8, and finally is discharged outside the mold. Through the guiding effect of the serrated structure, the venting area can be increased in the limited space of the mold, the gas flow path can be extended, the stability of the venting process can be ensured, and the molding quality of plastic products can be improved.

[0026] In this embodiment, the exhaust annular groove 4 includes a primary annular groove 41 and a secondary annular groove 42. The primary annular groove 41 surrounds and communicates with the mounting hole 3, and is used to guide gas out during molten material injection. The secondary annular groove 42 surrounds the outside of the primary annular groove 41 and communicates with it, forming a secondary gas guiding area. Several diversion grooves 43 are spaced around the circumference of the secondary annular groove 42. The secondary annular groove 42 is connected to four exhaust ports 5 through the diversion grooves 43, thereby realizing multi-path diversion and transmission of gas from the secondary annular groove 42 to the exhaust ports 5, effectively optimizing the gas flow distribution. Through the guiding airflow effect of the primary annular groove 41 and the secondary annular groove 42, combined with the gas flow distribution by the diversion grooves 43, the risk of local pressure concentration in the exhaust system is effectively reduced, the uniformity and efficiency of gas discharge are improved, and a stable gas delivery foundation is provided for the efficient exhaust of the subsequent exhaust channel 8.

[0027] In this embodiment, the depth of the secondary annular groove 42 is greater than that of the primary annular groove 41, thereby expanding the temporary storage space for gas by deepening the secondary annular groove 42.

[0028] In this embodiment, the depth of the primary annular groove 41 is less than the overflow value of the injection molten material, so as to prevent the molten material from overflowing into the primary annular groove 41 during the high-pressure filling stage, thereby avoiding the problem of the primary annular groove 41 being blocked by the molten material and causing venting failure.

[0029] In another embodiment, since the gas may not be able to be discharged in time through the venting channel 8 due to the long flow path of the molten material and the high filling speed, four movable holes 21 are provided at the bottom of the secondary annular groove 42. The four movable holes 21 are respectively arranged in the four directions of the secondary annular groove 42. The four side walls of the lower mold plate 2 are provided with auxiliary venting holes 22 in the horizontal direction. The four auxiliary venting holes 22 are respectively connected to the corresponding movable holes 21. When the molten material fills the mold at high speed, in addition to the gas discharged through the original venting channel 8, some gas can also enter the horizontal auxiliary venting holes 22 through the movable holes 21 at the bottom of the secondary annular groove 42, and finally be discharged directly from the side wall of the mold through the auxiliary venting holes 22, further improving the venting efficiency of the mold.

[0030] Additionally, a locking pin 23 is threaded to the bottom of the movable hole 21, and a spring 24 abuts against the top of the locking pin 23. The other end of the spring 24 abuts against a movable rod 25. A limiting ring 26 is provided at the top of the movable hole 21, and the upper end face of the movable rod 25 abuts against the lower end face of the limiting ring 26. The side wall of the movable rod 25 blocks one end of the auxiliary exhaust hole 22. In the initial state, the upper end face of the movable rod 25 abuts against the lower end face of the limiting ring 26 at the top of the movable hole 21, and the side wall blocks the auxiliary exhaust hole 22, preventing gas from escaping through this path. When the molten material fills the mold at high speed, the gas pressure inside the plastic mold rises rapidly. When the pressure exceeds the preload of the spring 24, the movable rod 25 moves downward against the resistance of the spring 24, and its sidewall gradually disengages from the sealed position of the auxiliary vent hole 22, allowing the gas to enter the auxiliary vent hole 22 through the movable hole 21 and be discharged from the mold. When the molten material is filled and the gas pressure decreases, the spring 24 returns to its original shape, pushing the movable rod 25 upward to reset. The upper end face of the movable rod 25 re-contacts the lower end face of the limit ring 26, and the sidewall seals the auxiliary vent hole 22 again, restoring the initial state. Thus, the venting efficiency can be automatically adjusted according to the gas pressure inside the mold.

[0031] 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.

[0032] 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 high-efficiency venting structure for a plastic mold, comprising an upper mold plate (1) and a lower mold plate (2), wherein the upper mold plate (1) and the lower mold plate (2) are provided with a connecting mounting hole (3) at their centers, the mounting hole (3) being used to insert a mold core assembly to achieve injection molding of molten material, characterized in that, The lower template (2) is provided with an exhaust ring groove (4) on the outer periphery of the mounting hole (3). The lower template (2) is provided with exhaust ports (5) communicating with the exhaust ring groove (4) in four directions. Several serrated protrusions (6) are provided at intervals in the four exhaust ports (5). The bottom of the upper template (1) is provided with serrated grooves (7) corresponding to the serrated protrusions (6) in the four directions. The serrated protrusions (6) and the serrated grooves (7) form a continuous exhaust channel (8) through non-contact fitting.

2. The high-efficiency venting structure for plastic molds according to claim 1, characterized in that, The exhaust ring groove (4) includes a primary ring groove (41) and a secondary ring groove (42). The primary ring groove (41) is arranged around the mounting hole (3) and communicates with the mounting hole (3). The secondary ring groove (42) is arranged around the outside of the primary ring groove (41) and communicates with the primary ring groove (41). The secondary ring groove (42) is provided with a number of diversion grooves (43) at intervals in the circumferential direction. The secondary ring groove (42) is connected to the four exhaust ports (5) through the number of diversion grooves (43).

3. The high-efficiency venting structure for plastic molds according to claim 2, characterized in that, The depth of the secondary annular groove (42) is greater than that of the primary annular groove (41).

4. The high-efficiency venting structure for plastic molds according to claim 3, characterized in that, The depth of the primary annular groove (41) is less than the overflow value of the injection molten material.

5. The high-efficiency venting structure for plastic molds according to claim 2, characterized in that, The bottom of the secondary annular groove (42) is provided with four movable holes (21), and the four movable holes (21) are respectively located in the four directions of the secondary annular groove (42). The four side walls of the lower template (2) are provided with auxiliary exhaust holes (22) in the horizontal direction, and the four auxiliary exhaust holes (22) are respectively connected to the corresponding movable holes (21).

6. The high-efficiency venting structure for plastic molds according to claim 5, characterized in that, The bottom of the movable hole (21) is threaded with a locking pin (23), the top of the locking pin (23) abuts against a spring (24), the other end of the spring (24) abuts against a movable rod (25), the top of the movable hole (21) is provided with a limiting ring (26), the upper end face of the movable rod (25) abuts against the lower end face of the limiting ring (26), and the side wall of the movable rod (25) seals one end of the auxiliary exhaust hole (22).

Images