Secondary tripping structure for inclined glue feeding of pin-point gate

Abstract

The utility model provides a secondary tripping structure for inclined glue feeding of a pin-point gate, which comprises a front mold core, a front mold push plate, a rear mold core and a rear mold push plate, the front mold core and the rear mold core are arranged up and down, the front mold push plate is arranged above the front mold core, and the rear mold push plate is arranged above the rear mold core. A front mold insert penetrating through the gap and the front mold core is arranged at the bottom of the front mold push plate; the rear mold core is provided with a cavity which is sunken inwards, the rear mold push plate is arranged in the cavity, and a rear mold column which penetrates through the rear mold push plate and abuts against the front mold insert is arranged in the cavity; the front mold push plate, the front mold insert and the rear mold column are provided with the glue inlet holes which are communicated with one another, and the glue inlet holes are designed in an inclined manner, so that a sprue of a product is formed in the inner wall of the product, and the flatness and the attractiveness of the outer wall of the product are improved; and through the secondary ejection design of the ejector rod and the ejector pin, the risks of product support damage and burr generation are effectively reduced, so that the production efficiency and the qualification rate of the product are improved.

Description

Technical Field

[0001] The utility model belongs to the field of injection molds, and particularly relates to a secondary unlocking structure with a thin gate and inclined glue injection. Background Art

[0002] Injection molding refers to injecting molten plastic materials into the cavity of a mold under high pressure, and after cooling and solidifying, separating the front mold and the rear mold and using an ejection mechanism to eject the solidified product. Currently, injection molding is suitable for mass production of products with complex shapes and is one of the important processing methods in industrial production;

[0003] During actual production, in order to facilitate glue injection, the gate is usually set on the upper and lower edges or the outer surface of the product. However, for products with high requirements for the flatness of the outer surface, the gate needs to be removed or polished by special equipment or manually after demolding, thus increasing the production cost. At the same time, for products with an annular structure and unequal upper and lower circle diameters, the front mold and the rear mold are usually forcibly demolded. However, this forced demolding method is likely to cause scratches or burrs on the product. Therefore, secondary grinding and processing are still required, which reduces the production efficiency, qualification rate, and increases the production cost. Summary of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] The utility model provides a secondary unlocking structure with a thin gate and inclined glue injection, aiming to solve the problems that the gate position and the demolding method in the prior art are unreasonable, resulting in the need for secondary processing of the product and an increase in production cost.

[0006] (2) Technical Solutions

[0007] The utility model provides a secondary unlocking structure with a thin gate and inclined glue injection, including a front mold core, a front mold push plate, a rear mold core, a rear mold push plate, a ejector rod, and a ejector pin. The front mold core and the rear mold core are arranged to open and close up and down. The front mold push plate is arranged above the front mold core and there is a first gap between the front mold push plate and the front mold core. A front mold insert is provided at the bottom of the front mold push plate and penetrates through the gap and the front mold core. An inwardly concave cavity is provided on the end face of the rear mold core close to the front mold core. The rear mold push plate is arranged in the cavity, and a rear mold column that penetrates through the rear mold push plate and abuts against the front mold insert is also provided in the cavity. Among them, the front mold core, the front mold insert, the rear mold column, and the rear mold push plate together form a receiving cavity for accommodating the product. The top of the ejector rod passes through the rear mold core and abuts against the rear mold push plate, and the top of the ejector pin passes through the rear mold core and the rear mold column and extends into the receiving cavity to abut against the product.

[0008] Further, glue injection holes that communicate with each other vertically are provided in the front mold ejector plate, the front mold insert, and the rear mold post. The end of the glue injection hole in the rear mold post extends into the accommodation cavity and is connected to the inner wall of the product.

[0009] Further, one end of the glue injection hole located in the rear mold post is at the top of the rear mold post, and the other end is at the side wall of the rear mold post, so that the glue injection hole is inclined in the rear mold post.

[0010] Further, the diameters of the glue injection holes sequentially arranged in the front mold ejector plate, the front mold insert, and the rear mold post from top to bottom gradually decrease.

[0011] Further, the rear mold ejector plate and the rear mold core jointly clamp to form a limiting groove. A limiting block is movably connected in the limiting groove. The limiting block is sleeved on the ejector rod and at least partially abuts against the ejector rod vertically.

[0012] Further, a first inclined surface is provided on the peripheral wall of the ejector rod. A second inclined surface corresponding to and abutting against the first inclined surface is provided on the inner wall of the limiting block. A third inclined surface is provided on the outer end wall of the limiting block opposite to the second inclined surface. A fourth inclined surface corresponding to and abutting against the third inclined surface is provided in the limiting groove; wherein, the first inclined surface and the fourth inclined surface form a "V" - shaped structure.

[0013] Further, the inner diameter D1 of the inner wall of the limiting block is equal to the outer diameter D3 of the outer wall of the ejector rod below the first inclined surface, and is greater than the outer diameter D2 of the outer wall of the ejector rod above the first inclined surface.

[0014] Further, in the horizontal direction, the distance D4 between the inner walls at both ends of the limiting groove in the rear mold ejector plate is greater than the distance D5 between the outer walls at both ends of the limiting block, so that the limiting block can move horizontally within the limiting groove.

[0015] Further, sliding strips are provided on both sides of the limiting block. The setting direction of the sliding strips corresponds to the horizontal moving direction of the limiting block. Two fixing blocks fixedly connected to the rear mold ejector plate are provided in the limiting groove. The top of the fixing block slidably abuts against the bottom of the sliding strip.

[0016] Further, a guide post is further included. The guide post sequentially penetrates through the rear mold core, the rear mold ejector plate, and the front mold core, and has a guiding effect on the movement of the rear mold core, the rear mold ejector plate, and the front mold core;

[0017] An elastic member that pushes the top of the front mold ejector plate is further abutted. The elastic member is a spring or a cylinder.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] By providing interconnected glue injection holes on the front mold ejector plate, the front mold insert, and the rear mold post, and with the inclined design of the glue injection holes, the gate of the product is set inside the inner wall of the product, thereby improving the flatness and aesthetics of the outer wall of the product, and saving the processing cost of manual secondary polishing after demolding. At the same time, through the secondary ejection design of the ejector rod and the ejector pin, the risk of product scratching and burr generation is effectively reduced, thereby improving the production efficiency and qualified rate of the product. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0021] Figure 2 It is a schematic diagram of the product structure of the present utility model.

[0022] Figure 3 For the present utility model Figure 1 A cross-sectional view along the L1 section line of sight.

[0023] Figure 4 It is a schematic diagram of the partial structure of the present utility model.

[0024] Figure 5 For the present utility model Figure 4 A cross-sectional view along the L2 section line of sight.

[0025] Figure 6 It is a cross-sectional view of the counterbore of the present utility model.

[0026] Figure 7 For the present utility model Figure 4 A cross-sectional view along the L3 section line of sight.

[0027] Figure 8 For the present utility model Figure 7 Exploded view.

[0028] Figure 9 For the present utility model, the movement schematic of the limit block Figure 1 .

[0029] Figure 10 For the present utility model, the movement schematic of the limit block Figure 2 .

[0030] Figure 11 It is a schematic diagram of the limit block structure of the present utility model.

[0031] Reference numerals: 1 - front mold core, 11 - front mold ejector plate, 12 - front mold insert, 13 - groove, 131 - first gap, 14 - elastic member, 15 - gate, 151 - end, 2 - rear mold core, 21 - rear mold ejector plate, 211 - countersunk hole, 212 - countersunk screw, 213 - first countersunk step, 214 - second countersunk step, 215 - second gap, 216 - first limiting step, 22 - cavity, 23 - rear mold post, 24 - limiting block, 241 - second inclined surface, 242 - third inclined surface, 243 - slide bar, 25 - limiting groove, 251 - fourth inclined surface, 26 - fixing block, 3 - accommodating cavity, 31 - product, 311 - convex ring, 312 - ejection step, 4 - ejector rod, 41 - ejector pin, 42 - first inclined surface, 43 - vertical section, 44 - second limiting step, 5 - guide post. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] As Figure 1-7 shown, the present invention provides a secondary ejection structure with a thin gate and inclined gate feeding, including a front mold core 1, a front mold ejector plate 11, a rear mold core 2 and a rear mold ejector plate 21. The front mold core 1 and the rear mold core 2 are arranged to open and close up and down. The front mold ejector plate 11 is arranged above the front mold core 1. A front mold insert 12 that penetrates the front mold core 1 and extends towards the rear mold core 2 is provided at the bottom of the front mold ejector plate 11. An inwardly recessed cavity 22 is provided on the end face of the rear mold core 2 close to the front mold core 1. The rear mold ejector plate 21 is arranged in the cavity 22. A rear mold post 23 that penetrates the rear mold ejector plate 21 and abuts against the front mold insert 12 is further provided in the cavity 22. Among them, the front mold core 1, the front mold insert 12, the rear mold post 23 and the rear mold ejector plate 21 together form an accommodating cavity 3 for injecting the product 31.

[0034] It should be noted that in this embodiment, the front mold core 1 and the rear mold core 2 are placed vertically up and down. In actual use, they can also be arranged horizontally, that is, horizontally opened and closed. Therefore, the vertical placement adopted in this embodiment is for the convenience of explaining the use purpose and technical solution of the present invention, and should not be construed as a limitation to the present invention.

[0035] Specifically, as Figure 2-3As shown, the product 31 located within the accommodation cavity 3 is of an annular structure, with an annular convex ring 311 provided on its inner wall and a top ejection step 312 provided on its outer wall; before demolding, the product 31 is disposed within the accommodation cavity 3, the outer wall of the bottom of the front mold insert 12 abuts against the upper inner wall of the product 31, and the top surface of the convex ring 311 within the product 31 abuts against the bottom of the front mold insert 12; the lower inner wall of the product 31 and the bottom of the convex ring 311 abut against the top of the rear mold post 23; meanwhile, the bottom of the top ejection step 312 of the product 31 and the peripheral wall below the top ejection step 312 abut against the rear mold push plate 21;

[0036] Specifically, as Figure 5 shown in FIG. 6 or FIG. 7, the secondary demolding structure of the pin-point side gate also includes a ejector rod 4 and a ejector pin 41. The top of the ejector rod 4 passes through the rear mold core 2 and abuts against the rear mold push plate 21. The top of the ejector pin 41 passes through the rear mold core 2 and the rear mold post 23 and abuts against a part of the bottom of the convex ring 311 of the product 31. That is to say, the top of the ejector pin 41 and the top of the rear mold post 23 jointly abut against the bottom of the convex ring 311;

[0037] During mold opening, the front mold core 1 moves upward, separating it from the upper outer wall of the product 31 and the rear mold core 2. Since there is a first gap 131 between the bottom of the front mold push plate 11 and the top of the front mold core 1, during the upward movement of the front mold core 1, the front mold insert 12 will continuously abut against the product 31, fixing the product 31 on the rear mold core 2 and facilitating the separation of the product 31 from the front mold core 1; when the front mold core 1 continues to move upward and abuts against the bottom of the front mold push plate 11, the front mold core 1 drives the front mold push plate 11 and the front mold insert 12 to move upward synchronously, and separates the front mold insert 12 from the product 31, thereby realizing the demolding of the upper half of the product 31;

[0038] Subsequently, the ejector rod 4 and the ejector pin 41 move upward synchronously, pushing the rear mold push plate 21 and the product 31 to move upward synchronously, realizing the ejection of the product 31 and its separation from the rear mold post 23. Finally, the ejector pin 41 continues to move upward and pushes the product 31 to move upward, realizing the secondary ejection of the product 31 and its separation from the rear mold push plate 21, and thus completing the demolding of the lower half of the product 31;

[0039] Compared with the strong demolding method in the prior art, in this embodiment, the front mold core 1 is first lifted and separated from the outer peripheral wall of the upper half of the product 31, so that the outer peripheral wall of the upper half of the product 31 can undergo a slight outward expansion deformation, and then the front mold insert 12 is lifted and separated from the inner wall of the upper half of the product 31; furthermore, by first synchronously lifting the ejector rod 4 and the ejector pin 41 to synchronously lift the rear mold push plate 21 and the product 31, the separation of the product 31 from the rear mold core 2 is achieved. After losing the abutment of the rear mold post 23, the lower half of the product 31 can undergo a slight inward contraction deformation, and then the separation of the product 31 from the rear mold push plate 21 is achieved through the secondary ejection of the ejector pin 41;

[0040] By using the method that the product 31 can undergo slight deformation, the drag injury or damage during the demolding of the product 31 is effectively reduced; at the same time, through the secondary ejection structure of the ejector rod 4 and the ejector pin 41, the lower half of the product 31 is gradually separated from the rear mold core 2, which not only effectively reduces the drag injury during the demolding of the product 31, but also can solve the problem that burrs will be generated by strong demolding and require manual secondary processing and polishing, thereby effectively reducing the production cost and improving the qualification rate of the product 31.

[0041] Specifically, glue inlet holes 15 that communicate with each other are provided in the front mold push plate 11, the front mold insert 12, and the rear mold post 23. The end 151 of the glue inlet hole 15 in the rear mold post 23 communicates with the accommodation cavity 3. That is to say, the end 151 of the glue inlet hole 15 of the rear mold post 23 is connected to the inner wall of the product 31; when injecting glue, the liquid glue enters the glue inlet hole 15 from the top of the front mold push plate 11, flows into the glue inlet hole 15 of the front mold insert 12 from the bottom of the front mold push plate 11, then flows into the glue inlet hole 15 of the rear mold post 23, and finally flows to the accommodation cavity 3; through the through-type and three-stage glue inlet hole 15 structure, the gate of the product 31 is arranged in the inner wall of the product 31, so that the outer surface of the product 31 can be more flat and smooth, which better meets the appearance production requirements of the product 31, thereby saving the production cost of secondary polishing and processing;

[0042] Furthermore, one end of the glue inlet hole 15 located in the rear mold post 23 is at the top of the rear mold post 23, and the other end is at the side wall of the rear mold post 23, so that the glue inlet hole 15 in the rear mold post 23 is an inclined structure. Through this inclined structure, while the gate can be arranged on the inner wall of the product 31, the glue injection during the injection molding of the product 31 is smoother.

[0043] Furthermore, the diameter of one end of the glue inlet hole 15 close to the product 31 is smaller than that of the end far from the product 31, so that the glue inlet hole 15 sequentially arranged in the front mold ejector plate 11, the front mold insert 12 and the rear mold column 23 from top to bottom gradually tapers, facilitating the minimization of the gate and achieving the purpose of more material saving.

[0044] Specifically, a groove 13 corresponding to the front mold ejector plate 11 is provided at the top of the front mold core 1. The front mold ejector plate 11 is arranged in the groove 13. The design of the groove 13 saves the vertical distance between the front mold ejector plate 11 and the front mold core 1, thereby reducing the volume of the present invention, making the present invention more compact and tidy, and thus improving the space utilization rate.

[0045] Further, the vertical depth of the groove 13 is greater than the vertical thickness of the front mold ejector plate 11. When the product 31 is in the injection molding state, a first gap 131 is formed between the bottom wall of the groove 13 and the bottom of the front mold ejector plate 11, and during the ejection process of the product 31, the front mold ejector plate 11 can move up and down within the groove 13.

[0046] Furthermore, an elastic member 14 and a frame (not shown) are further provided at the top of the front mold ejector plate 11. One end of the elastic member 14 abuts against the top of the front mold core 1, and the other end abuts against the frame. When the product 31 is injection molded, the frame drives the front mold core 1 and the front mold ejector plate 11 to move towards the rear mold core 2. After the front mold insert 12 abuts against the rear mold core 2 and cannot continue to move downward, when the frame continues to move and drives the front mold core 1 to move downward, the elastic member 14 is compressed, thereby increasing the abutting force between the front mold insert 12 and the rear mold column 23, making the injection molding of the product 31 more stable.

[0047] When the mold is opened, the front mold core 1 and the frame move upward. Under the elastic force of the elastic member 14, the front mold ejector plate 11 and the front mold insert 12 move downward relative to the front mold core 1 and remain in contact with the product 31, thereby providing a supporting force for fixing the product 31 on the rear mold core 2 and also promoting the separation of the product 31 and the front mold core 1.

[0048] Preferably, the elastic member 14 is a spring or a cylinder.

[0049] Specifically, the secondary ejection structure of the pin point side gate oblique runner also includes a guide pillar 5. The guide pillar 5 sequentially penetrates through the rear mold core 2, the rear mold ejector plate 21 and the front mold core 1. During the mold opening and ejection process of the product 31, the guide pillar 5 can provide a guiding function for the movement of the rear mold core 2, the rear mold ejector plate 21 and the front mold core 1, thereby improving the stability of the demolding of the product 31.

[0050] Preferably, there are at least two guide posts 5. By setting at least two guide posts 5, the movement of the front mold core 1 and the rear mold ejector plate 21 is more stable, thereby reducing the damage to the product 31 during demolding, improving production efficiency and reducing production costs.

[0051] Specifically, as Figure 6 shown, a countersunk hole 211 is provided at the top of the rear mold ejector plate 21. A countersunk screw 212 is provided in the countersunk hole 211. The countersunk screw 212 passes through the countersunk hole 211 and is fixedly connected to the rear mold core 2. A first countersunk step 213 is provided in the countersunk hole 211. A second countersunk step 214 corresponding to the first countersunk step 213 is provided on the countersunk screw 212. Among them, in the injection molding state of the product 31, when the rear mold ejector plate 21 is arranged in the cavity 22 and abuts against the bottom wall of the cavity 22, there is a second gap 215 between the first countersunk step 213 and the second countersunk step 214. When the upward ejection distance of the rear mold ejector plate 21 is equal to the vertical distance of the second gap 215, the rear mold ejector plate 21 cannot continue to eject relative to the rear mold core 2. Therefore, the setting of the countersunk hole 211 and the countersunk screw 212 has a limiting effect on the ejection distance of the rear mold ejector plate 21;

[0052] That is to say, during the process of the ejector rod 4 pushing the rear mold ejector plate 21 to eject upward, the first countersunk step 213 in the rear mold ejector plate 21 approaches the second countersunk step 214 of the countersunk screw 212. When the first countersunk step 213 abuts against the second countersunk step 214, the upward ejection distance of the rear mold ejector plate 21 relative to the rear mold core 2 is limited. At this time, the maximum ejection distance of the rear mold ejector plate 21 is the vertical distance of the second gap 215.

[0053] Specifically, as Figure 7As shown, in order to further control the ejection speed of the ejector rod 4 on the rear mold ejector plate 21, a limiting block 24 is movably connected between the rear mold ejector plate 21 and the rear mold core 2. A limiting groove 25 for accommodating the limiting block 24 is jointly formed by clamping the bottom of the rear mold ejector plate 21 and the bottom wall of the cavity 22 of the rear mold core 2. The limiting block 24 is sleeved on the ejector rod 4, and at least part of the limiting block 24 is in vertical contact with the ejector rod 4. During ejection, the ejector rod 4 pushes the limiting block 24 to move upward through the contact part between the limiting block 24 and the ejector rod 4. The limiting block 24 drives the rear mold ejector plate 21 to move upward synchronously. At the same time, during the ejection process, the limiting block 24 will shift horizontally (the horizontal direction is perpendicular to the ejection direction of the ejector rod), so that the contact surface of the contact part between the limiting block 24 and the ejector rod 4 gradually decreases. When the contact parts of the two are separated, the continuous upward movement of the ejector rod 4 cannot drive the limiting block 24 to continue to move upward. At this time, the ejector rod 4 and the ejector pin 41 continue to move upward for ejection. While the rear mold ejector plate 21 does not eject, the ejector pin 41 drives the product 31 to eject, so as to realize the separation of the product 31 from the rear mold ejector plate 21;

[0054] Further, as Figure 8-9 shown, a first inclined surface 42 is provided on the peripheral wall of the ejector rod 4, a second inclined surface 241 corresponding to the first inclined surface 42 is provided on the inner wall of the limiting block 24, a third inclined surface 242 is provided on the outer end wall of the limiting block 24 opposite to the second inclined surface 241, and a fourth inclined surface 251 corresponding to the third inclined surface 242 is provided in the limiting groove 25, and the fourth inclined surface 251 is provided on the rear mold core 2. During injection molding, the second inclined surface 241 of the limiting block 24 is in vertical contact with the first inclined surface 42 of the ejector rod 4, and the third inclined surface 242 of the limiting block 24 is in vertical contact with the fourth inclined surface 251 of the rear mold core 2;

[0055] Further, during the injection molding process, the first inclined surface 42 and the fourth inclined surface 251 form a "V" - shaped structure. During the ejection process, the ejector rod 4 drives the limiting block 24 to move upward. Due to the settings of the first inclined surface 42 and the second inclined surface 241, and the third inclined surface 242 and the fourth inclined surface 251, the limiting block 24 slides obliquely downward along the first inclined surface 42 relative to the ejector rod 4 and slides obliquely upward along the fourth inclined surface 251 relative to the rear mold core 2. Therefore, during the ejection process, the first inclined surface 42 and the second inclined surface 241, and the third inclined surface 242 and the fourth inclined surface 251 have a guiding and limiting effect on the movement of the limiting block 24, so that the ejector rod 4 drives the limiting block 24 to slide obliquely upward;

[0056] Furthermore, the inner wall diameter D1 of the limit block 24 is equal to or slightly larger than the outer wall diameter D3 of the ejector rod 4 below the first inclined surface 42. Above the first inclined surface 42 on the ejector rod 4, there is a vertical section 43 connected to the first inclined surface 42 and recessed inward. Due to the setting of the vertical section 43, the outer wall diameter D2 of the ejector rod 4 at the vertical section 43 is smaller than the inner wall diameter D1 of the limit block 24, so that the limit block 24 can move horizontally on the outer wall of the vertical section 43 of the ejector rod 4.

[0057] Preferably, as Figure 8 shown, the top of the ejector rod 4 passes through the rear mold ejector plate 21 and extends upward. The top of the rear mold ejector plate 21 is provided with a first limit step 216, and the top of the ejector rod 4 is provided with a second limit step 44 corresponding to the first limit step 216. When the ejector rod 4 moves downward to reset, the ejector rod 4 continuously moves downward, and the first limit step 216 and the second limit step 44 continuously approach. When the first limit step 216 abuts against the second limit step 44, the ejector rod 4 continues to move downward to reset, thereby driving the rear mold ejector plate 21 to synchronously reset downward. Therefore, through the setting of the first limit step 216 and the second limit step 44, the downward reset of the ejector rod 4 can drive the rear mold ejector plate 21 to synchronously move downward to reset, and prepare for the next injection molding and demolding of the product 31.

[0058] Specifically, as Figure 7-11 shown, in the horizontal moving direction of the limit block 24, the distance D4 between the inner walls of the two horizontal sides of the limit groove 25 in the rear mold ejector plate 21 is greater than the distance D5 between the outer walls of the two horizontal sides of the limit block 24, so that the limit block 24 can move horizontally within the limit groove 25;

[0059] Furthermore, sliding strips 243 are provided on both sides of the limit block 24. The setting direction of the sliding strips 243 corresponds to the horizontal moving direction of the limit block 24. Two fixing blocks 26 fixedly connected to the rear mold ejector plate 21 are provided in the limit groove 25. The top of the fixing block 26 is in sliding contact with the bottom of the sliding strip 243. Through the setting of the sliding strip 243 and the fixing block 26, the limit block 24 can slide horizontally within the limit groove 25.

[0060] The working principle of the present invention will be described in detail below;

[0061] During injection molding, when the front mold core 1 and the rear mold core 2 are in the closed state, the glue is injected through the glue inlet hole 15. After the product 31 is shaped, the front mold core 1, the front mold push plate 11 and the front mold insert 12 are synchronously lifted by the frame. Under the elastic force of the elastic member 14, the front mold insert 12 continuously abuts against the rear mold core 2, facilitating the separation and demolding of the product 31 by the front mold core 1. Subsequently, under the synchronous upward ejection action of the ejector rod 4, the limit block 24 and the ejector pin 41, the rear mold push plate 21 and the product 31 are synchronously ejected and separated from the rear mold core 2. When the limit block 24 is laterally offset and the first inclined surface 42 is separated from the second inclined surface 241, the continuous ejection of the ejector rod 4 and the ejector pin 41 cannot drive the rear mold push plate 21 to eject, thereby realizing the secondary ejection of the product 31 by the ejector pin 41, and then completing the demolding of the product 31.

[0062] The innovation of the present utility model lies in that by providing interconnected glue inlet holes on the front mold push plate, the front mold insert and the rear mold column and the inclined design of the glue inlet holes, the gate of the product is arranged inside the inner wall of the product, thereby improving the flatness and aesthetics of the outer wall of the product and saving the processing cost of manual secondary polishing after demolding. At the same time, through the secondary ejection design of the ejector rod and the ejector pin, the risk of product scratching and burr generation is effectively reduced, thereby improving the production efficiency and qualified rate of the product.

[0063] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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.

[0064] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A secondary release structure for oblique injection of a narrow shroud, characterized in that: The invention comprises a front mold core (1), a front mold push plate (11), a rear mold core (2), a rear mold push plate (21), an ejector rod (4) and an ejector pin (41); the front mold core (1) and the rear mold core (2) are arranged to open and close up and down; the front mold push plate (11) is arranged above the front mold core (1) and a first gap (131) is arranged between the front mold core (1); the bottom of the front mold push plate (11) is provided with a front mold insert (12) penetrating the gap (131) and the front mold core (1); the end surface of the rear mold core (2) close to the front mold core (1) is provided with an inwardly recessed cavity (22); the rear mold push plate (21) is arranged in the cavity (22); the cavity (22) is also provided with a rear mold column (23) penetrating the rear mold push plate (21) and abutting against the front mold insert (12); The front mold core (1), the front mold insert (12), the rear mold column (23) and the rear mold push plate (21) together constitute a receiving cavity (3) for receiving a product (31); the top of the ejector pin (4) passes through the rear mold core (2) and abuts against the rear mold push plate (21); the top of the ejector pin (41) passes through the rear mold core (2) and the rear mold column (23) and extends into the receiving cavity (3) to abut against the product (31).

2. According to claim 1, a secondary release structure for oblique injection of a narrow shroud, characterized in that: The front mold push plate (11), the front mold insert (12) and the rear mold column (23) are all provided with glue inlet holes (15) which are interconnected up and down, and the end (151) of the glue inlet hole (15) in the rear mold column (23) extends into the accommodating cavity (3) and is connected to the inner wall of the product (31).

3. According to claim 2, a secondary release structure for oblique injection of a narrow shroud, characterized in that: One end of the glue inlet hole (15) located in the rear mold column (23) is located at the top of the rear mold column (23), and the other end is located at the side wall of the rear mold column (23), so that the glue inlet hole (15) is arranged in an inclined manner in the rear mold column (23).

4. According to claim 3, a secondary release structure for oblique injection of a narrow shroud is characterized in that: The diameters of the glue inlet holes (15) arranged in sequence from top to bottom in the front mold push plate (11), the front mold insert (12) and the rear mold column (23) gradually decrease.

5. According to claim 1, a secondary release structure for oblique injection of a narrow shroud, characterized in that: The rear mold push plate (21) and the rear mold core (2) are clamped together to form a limit groove (25), and a limit block (24) is movably connected in the limit groove (25). The limit block (24) is sleeved on the push rod (4) and at least partially abuts against the push rod (4) up and down.

6. According to claim 5, a secondary release structure for oblique injection of a narrow shroud is characterized in that: The peripheral wall of the push rod (4) is provided with a first inclined surface (42), the inner wall of the limit block (24) is provided with a second inclined surface (241) corresponding to and abutting against the first inclined surface (42), the outer end wall of the limit block (24) opposite to the second inclined surface (241) is provided with a third inclined surface (242), and the limit groove (25) is provided with a fourth inclined surface (251) corresponding to and abutting against the third inclined surface (242); wherein the first inclined surface (42) and the fourth inclined surface (251) form a "V"-shaped structure.

7. A secondary release structure for oblique injection of a narrow shroud according to claim 6, characterized in that: The inner wall diameter D1 of the limit block (24) is equal to the outer wall diameter D3 below the first inclined surface (42) on the push rod (4), and is larger than the outer wall diameter D2 above the first inclined surface (42) on the push rod (4).

8. According to claim 7, a secondary release structure for oblique injection of a narrow shroud is characterized in that: In the transverse direction, the distance D4 between the inner walls of the two ends of the limiting groove (25) in the rear mold push plate (21) is greater than the distance D5 between the outer walls of the two ends of the limiting block (24), so that the limiting block (24) can be located in the limiting groove (25) and move transversely.

9. A secondary release structure for oblique injection of a narrow shroud according to claim 8, characterized in that: Slide bars (243) are provided on both sides of the limit block (24), and the setting direction of the slide bar (243) corresponds to the lateral movement direction of the limit block (24). Two fixed blocks (26) fixedly connected to the rear mold push plate (21) are provided in the limit groove (25), and the top of the fixed block (26) is slidably abutted against the bottom of the slide bar (243).

10. The secondary release structure of the narrow shroud oblique glue injection according to claim 1, characterized in that: It also includes a guide column (5), which sequentially penetrates the rear mold core (2), the rear mold push plate (21) and the front mold core (1) and has a guiding function for the movement of the rear mold core (2), the rear mold push plate (21) and the front mold core (1); The top of the front mold push plate (11) is also in contact with an elastic member (14) that has a pushing effect on it, and the elastic member (14) is a spring or a cylinder.

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