Mold structure

Abstract

The application discloses a mold structure and relates to the technical field of molds. The mold structure comprises an upper mold base and a lower mold base arranged in the up-down direction. The upper mold base and the lower mold base define a mold cavity when they are closed. The upper end of the lower mold base is formed with a glue containing groove. The glue containing groove is communicated with the mold cavity. The bottom surface of the glue containing groove is concavely provided with a plurality of glue overflow grooves. At least one of the glue overflow grooves is gradually outwardly expanded downward. The lower end of the lower mold base is provided with a plurality of ejection channels which are communicated with the plurality of glue overflow grooves. The mold structure further comprises an ejection assembly which is arranged below the lower mold base. The ejection assembly comprises a plurality of ejector rods which are movably arranged in the corresponding ejection channels. After the glue material is formed, a part of the waste glue material can be left in the glue overflow groove during the mold opening process. During the mold opening process, the tearing force of the mold separation on the waste glue at the glue nozzle of the injection molding machine gradually increases, and the pulling force of the waste glue material in the glue overflow groove also gradually increases, so that the connection between the waste glue material in the glue containing groove and the glue nozzle of the injection molding machine can be finally pulled off.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mold, in particular to a mold structure. BACKGROUND

[0002] In the injection molding design, after the rubber material is formed, considering the pulling relationship between the waste rubber material and the rubber nozzle, the end of the ejector pin is usually shaped to increase the connection strength between the ejector pin and the waste rubber material, so that the waste rubber material can be pulled, and the waste rubber material is separated from the rubber nozzle of the injection molding machine and the product after the mold is opened.

[0003] However, due to the shaping design of the end of the ejector pin, the stress of the end of the ejector pin is increased, the mechanical force generated during the ejection process is unstable, and the ejector pin is prone to local fracture. SUMMARY

[0004] The main purpose of the present application is to provide a mold structure, which adjusts the structure of the lower mold base to transfer the pulling force of the waste rubber material from the ejector pin to the lower mold base, solves the unstable problem of the rubber material at the gate, and has reliable mold workpiece strength and convenient maintenance.

[0005] To achieve the above purpose, the present application provides a mold structure, which comprises an upper mold base and a lower mold base arranged in the up-down direction, the upper mold base and the lower mold base define a mold cavity when they are closed, the upper end of the lower mold base is formed with a rubber containing groove, the rubber containing groove is communicated with the mold cavity, the bottom surface of the rubber containing groove is concavely provided with a plurality of overflow grooves, at least one of the overflow grooves is gradually outwardly arranged downward, and the lower end of the lower mold base is provided with a plurality of ejection channels communicated with the plurality of overflow grooves.

[0006] The mold structure further comprises an ejection assembly located below the lower mold base, the ejection assembly comprises a plurality of ejector pins, and the ejector pins are movably arranged in the corresponding ejection channels in the up-down direction.

[0007] In an embodiment, the overflow groove is columnarly arranged, the radius of the upper end of the overflow groove is R1, the radius of the lower end of the overflow groove is R2, and 0.4mm≤R2-R1≤0.6mm.

[0008] In an embodiment, the depth of the overflow groove is 10-14mm.

[0009] In an embodiment, the rubber containing groove is used to communicate with the rubber nozzle of the injection molding machine to serve as a rubber injection runner.

[0010] In an embodiment, the upper end of the ejector pin is convexly provided with a boss, and the boss is located in the overflow groove when the mold structure is closed.

[0011] In an embodiment, the peripheral side surface of the boss is arranged in an inclined manner to form an inclined annular surface, and the included angle between the inclined annular surface and the center line of the ejector rod is 15°-20°.

[0012] In an embodiment, the height of the boss is 2.8-3.2 mm.

[0013] In an embodiment, the plurality of overflow grooves comprises a first overflow groove and a second overflow groove, and the sizes of the upper ends of the first overflow groove and the second overflow groove are arranged in a different manner.

[0014] In an embodiment, the first overflow groove is arranged in a gradually outward expanding manner downward; and / or,

[0015] The second overflow groove comprises a first groove segment and a second groove segment arranged in sequence in the up-down direction, the first groove segment is arranged in a gradually inward shrinking manner downward, and the second groove segment is arranged in a gradually outward expanding manner downward.

[0016] In an embodiment, the first overflow groove is located in the middle of the glue containing groove, and the second overflow groove is located at the edge of the glue containing groove.

[0017] In the technical scheme, after the glue material is formed, the glue material in the glue containing groove can pull the glue nozzle of the injection molding machine and the injection molded part, based on the downward outward expanding arrangement of the overflow groove, the waste glue material formed in the overflow groove presents a state of thin top end and thick bottom end, so that a part of the waste glue material can remain in the overflow groove during the mold opening process. At the same time, during the gradual mold opening process, the distance between the upper mold base and the lower mold base increases, the tearing force of the mold separation on the waste glue at the glue nozzle of the injection molding machine gradually increases, and the pulling force of the waste glue material in the overflow groove gradually increases. With the gradual increase of the force value, the connection between the waste glue material in the glue containing groove and the glue nozzle of the injection molding machine is finally pulled off, under the cooperation of the parting surface of the lower mold base, the connection between the waste glue material in the glue containing groove and the injection molded part in the mold cavity of the lower mold base is pulled off, so as to complete the separation of the waste glue material. In the ejection stage, the waste glue material in the overflow groove is ejected by the plurality of ejector rods, so as to separate the entire waste glue material from the lower mold base. The entire process has strong stability for the glue material at the gate to be disconnected, and the strength of the lower mold base and the ejector rod is reliable. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0019] Figure 1Structure schematic view of one embodiment of the mold structure provided by the present application;

[0020] Figure 2 For Figure 1 Structure schematic view of the middle lower mold base;

[0021] Figure 3 For Figure 1 Structure schematic view of the cooperation of the middle injection molded part and the glue nozzle;

[0022] Figure 4 For Figure 1 Structure schematic view of the ejection assembly;

[0023] Figure 5 For Figure 1 Structure schematic view of the glue overflow groove (one embodiment);

[0024] Figure 6 For Figure 1 Structure schematic view of the glue overflow groove (another embodiment).

[0025] Brief Description of the Drawings:

[0026] 100, mold structure; 1, lower mold base; 10, glue containing groove; 11, glue overflow groove; 11a, first glue overflow groove; 11b, second glue overflow groove; 111, first groove section; 112, second groove section; 12, ejection channel; 2, ejection assembly; 21, ejector rod; 211, boss; 212, inclined annular surface; 22, ejection plate; 221, first panel; 222, second panel; 200, glue nozzle; 300, injection molded part; 400, mold cavity.

[0027] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0029] It should be noted that if the directionality indication is involved in the embodiments of the present application, the directionality indication is only used to explain the relative position relationship, movement condition and the like between the components in a certain posture, and if the certain posture is changed, the directionality indication is also changed accordingly.

[0030] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0031] In the injection molding design, considering the relationship between the waste rubber material and the rubber nozzle after the rubber material is formed, the end of the ejector pin is usually specially shaped to enhance the connection between the ejector pin and the waste rubber material, so as to effectively pull the waste rubber material, and ensure that the waste rubber material can be separated from the rubber nozzle of the injection molding machine and the product after the mold is opened. The common shaping mode of the end of the ejector pin includes hook, inclined surface, groove or specific undercut notch structure, which can more accurately hook the edge of the waste rubber material, ensure that the waste rubber material is separated from the rubber nozzle of the injection molding machine and the product during the mold opening process due to the pulling of the ejector pin, and can be left on the lower mold base under the pulling of the ejector pin, facilitating the taking out.

[0032] However, this design for the ejector pin also has certain disadvantages. Due to the special shape of the end of the ejector pin, the stress condition is significantly increased, resulting in unstable mechanical force generated during the ejection process, and the ejector pin is prone to local fracture. Specifically, when the end of the ejector pin is hook-shaped, during the ejection process, the waste rubber material can generate a large reaction force on the end of the ejector pin, especially in the case that the waste rubber material is thick, the rubber nozzle has more residues, or the product structure is complex, resulting in that the waste rubber material is connected closely with the rubber nozzle. The impact force and friction force borne by the end of the ejector pin will be significantly increased. In addition, the shaping design can change the original stress distribution of the ejector pin, so that the stress is concentrated in a specific area of the end, the mechanical force generated during the ejection process is unstable, and the long-term repeated ejection action is easy to cause fatigue cracks in this area, eventually leading to local fracture. After the ejector pin is broken, it is not easy to replace quickly, and it needs to be taken out, thereby affecting the stability of production.

[0033] In view of this, the present application proposes a mold structure, which adjusts the structure of the lower mold base, so as to transfer the pulling force on the waste rubber material from the ejector pin to the lower mold base, solves the unstable problem of the rubber material at the gate being disconnected, and the mold workpiece has reliable strength and is convenient to maintain.

[0034] Please refer to Figures 1 to 3The mold structure 100 comprises an upper mold base and a lower mold base 1 arranged in the up-down direction, the upper mold base and the lower mold base 1 define a mold cavity 400 when clamped, the upper end of the lower mold base 1 is formed with a glue containing groove 10, the glue containing groove 10 is communicated with the mold cavity 400, the bottom surface of the glue containing groove 10 is concavely provided with a plurality of glue overflow grooves 11, at least one glue overflow groove 11 is gradually outwardly arranged downward, the lower end of the lower mold base 1 is provided with a plurality of ejection channels 12 communicated with the plurality of glue overflow grooves 11; the mold structure 100 further comprises an ejection assembly 2 located below the lower mold base 1, the ejection assembly 2 comprises a plurality of ejector rods 21, the ejector rods 21 are movably arranged in the corresponding ejection channels 12 along the up-down direction.

[0035] In the technical scheme of the present application, after the glue material is formed, the glue material in the glue containing groove 10 can pull the injection molded part 300 and the glue nozzle 200 of the injection molding machine, based on the downward outward arrangement of the glue overflow groove 11, the waste glue material formed in the glue overflow groove 11 presents a state of thin top and thick bottom, so that a part of the waste glue material can remain in the glue overflow groove 11 during mold opening. At the same time, during the gradual opening of the mold, the distance between the entire upper mold base and the lower mold base 1 increases, the tearing force of the mold separation on the waste glue at the glue nozzle 200 of the injection molding machine gradually increases, the pulling force of the waste glue material in the glue overflow groove 11 also gradually increases, with the gradual increase of the force value, the connection between the waste glue material in the glue containing groove 10 and the glue nozzle 200 of the injection molding machine is finally pulled off, under the cooperation of the parting surface of the lower mold base 1, the connection between the waste glue material in the glue containing groove 10 and the injection molded part 300 remaining in the mold cavity 400 of the lower mold base 1 is pulled off, thereby completing the separation of the waste glue material, during the ejection stage, the waste glue material in the glue overflow groove 11 is ejected by the plurality of ejector rods 21, thereby driving the entire waste glue material to separate from the lower mold base 1, the entire process has strong stability for the glue material at the gate to be disconnected, and the strength of the lower mold base 1 and the ejector rod 21 is reliable.

[0036] In the process of fine mold design, in order to ensure that the glue nozzle 200 of the injection molding machine can accurately and efficiently guide the liquid glue to flow smoothly into the cavity of the mold, and effectively prevent the mold cavity 400 from appearing adverse conditions such as bubbles, glue material not being able to completely fill, etc. affecting the quality of the product during injection molding, the designer usually designs a flow channel matched with the structure of the upper mold base and / or the lower mold base 1. The main function of these flow channels is to guide the liquid glue to flow along the predetermined path, ensuring that the glue can be uniformly and fully filled into every corner of the mold cavity 400. However, after the injection molding process is completed, the glue in these flow channels will not become part of the final product, but needs to be effectively separated from the formed injection molded part 300, and finally be discharged as waste glue material in the production process.

[0037] It should be noted that based on different mold design forms and the shape of the injection molding part 300, in some embodiments, the glue nozzle 200 of the injection molding machine corresponds to the upper mold base, the glue inlet runner is arranged on the upper mold base, the glue containing groove 10 serves as the overflow runner of the lower mold base 1 and can communicate with the glue inlet runner, after the glue material is formed, the glue material in the glue inlet runner and the overflow runner is connected as a whole to form waste glue material. After the mold is opened, part of the waste glue material can be disconnected from the glue nozzle 200 of the injection molding machine under the action of the pulling force due to the undercut design of the overflow groove 11.

[0038] In some embodiments, the mold structure 100 adopts inverted glue inlet, that is, the gate is arranged in the movable mold, that is, the runner glue inlet system of the mold is arranged on the movable mold side of the mold. In this way, the waste glue material is finally formed on the back side of the product, which does not affect the smooth and beautiful appearance of the product. This design makes the glue inlet speed faster and the glue inlet flow more uniform, ensures that the glue inlet is fully filled, and improves the product quality and production efficiency. At this time, the glue containing groove 10 directly communicates with the glue nozzle 200 of the injection molding machine to serve as the glue inlet runner, and the part of the waste glue material in the overflow groove 11 applies a pulling force to the glue nozzle 200, and the force transmission path is shorter and the effect is better.

[0039] The present application does not limit the shape of the overflow groove 11, in some embodiments, the overflow groove 11 is arranged in a column shape, and correspondingly, the diameter of the overflow groove 11 gradually increases downward, so that the part of the waste glue material in the overflow groove 11 is in a circular truncated cone shape after forming. Based on this embodiment, the effective pulling force is ensured, the radius of the upper end of the overflow groove 11 is R1, and the radius of the lower end of the overflow groove 11 is R2, wherein 0.4mm≤R2-R1≤0.6mm. That is, when the overflow groove 11 is processed, the single-sided gap between the lower end and the upper end of the overflow groove 11 is controlled to be between 0.4-0.6mm, which can be 0.45mm, 0.5mm, 0.55mm. Thus, the jamming effect of the upper end of the overflow groove 11 on the waste glue material can be ensured, and the part of the waste glue material in the overflow groove 11 can be prevented from being pulled out of the overflow groove 11 under the action of the mold opening pulling force. The contact area between the overflow groove 11 and the glue material and the volume of the part of the waste glue material in the overflow groove 11 are ensured.

[0040] It should be noted that the column-shaped overflow groove 11 is convenient to process, in other embodiments, the cross section of the overflow groove 11 can be arranged in a regular polygonal shape such as a triangle, a polygon, etc., or can be arranged in an irregular shape to improve the pulling of the waste glue material, but the cooperation gap with the ejector pin 21 needs to be considered. The present application does not make detailed description here.

[0041] Further, the depth of the overflow groove 11 is 10-14 mm, which can be 12 mm, 13 mm, 13.5 mm, etc. Such a depth design is aimed at ensuring that the part of the waste glue material in the overflow groove 11 can occupy an appropriate volume, thereby effectively preventing the waste glue material from accidentally falling out of the overflow groove 11 when subjected to a pulling force during mold opening. By limiting the depth of the overflow groove 11, the storage amount of the waste glue material can be better managed, ensuring the stability of the production process and the reliability of the product quality.

[0042] In order to improve the connecting force of the ejector rod 21 and the waste glue material in the overflow groove 11, please refer to Figures 4 to 5 The upper end of the ejector rod 21 is provided with a boss 211, which is located in the overflow groove 11 when the mold structure 100 is closed. During the glue injection process, the boss 211 is always located in the overflow groove 11, so that the glue in the overflow groove 11 can be wrapped outside the boss 211 after molding. Through the structural design of the boss 211, the contact area between the ejector rod 21 and the waste glue material can be increased, thereby providing a certain pulling force to the waste glue material.

[0043] Further, the peripheral side of the boss 211 is not vertically arranged, but is intentionally designed to be inclined, thereby forming a unique inclined annular surface 212. Specifically, the inclined annular surface 212 forms a specific included angle a with the center line of the ejector rod 21, which is controlled to be between 15° and 20°, so as to ensure that it can play the best mechanical properties and functionality in actual application. Such an inclined design not only optimizes the structure of the boss 211, but also improves the stability and reliability of the overall device.

[0044] It should be understood that the height of the boss 211 is too low to play a role due to the small contact area with the waste glue material, and the height of the boss 211 is too large to affect the effective storage capacity of the overflow groove 11. Therefore, in the present embodiment, the height of the boss 211 is limited to 2.8-3.2 mm. Thus, the effective storage capacity of the overflow groove 11 and the contact area of the waste glue material with the boss 211 can be balanced.

[0045] It should be noted that there should be a certain gap between the peripheral side of the boss 211 and the inner side wall of the overflow groove 11 for glue filling.

[0046] Since the overflow groove 11 is arranged downwardly and gradually expanded, the sizes of the upper port and the lower port of the overflow groove 11 are different. When the ejector rod 21 is matched, it is necessary to ensure that the upper end of the ejector rod 21 does not interfere with the upper port of the overflow groove 11 during upward movement, and at the same time, the lower port of the overflow groove 11 and the ejection channel 12 are reasonably arranged so as not to cause overflow due to too large matching gap.

[0047] When the ejector rod 21 is performing the ejection process, although the waste rubber material is in contact and wrapped around the end of the ejector rod 21, based on the difference in material between the rubber material and the ejector rod 21, as well as the height limitation of the boss 211, therefore, after the waste rubber material is driven out of the overflow groove 11 by the ejector rod 21, it will not stick to the ejector rod 21.

[0048] Among the plurality of overflow grooves 11, only part of the overflow grooves 11 can be arranged in a downward expanding manner, or all of the plurality of overflow grooves 11 can be arranged in a downward expanding manner.

[0049] In the arrangement of the plurality of overflow grooves 11, either only part of the overflow grooves 11 can be arranged in a downward expanding manner, or all of the overflow grooves 11 can be designed in a downward expanding manner. The uniform outward expansion of the plurality of overflow grooves 11 can ensure that the plurality of overflow grooves 11 can limit the waste rubber material during the entire working process, thereby improving the stability of the entire mold opening process. Whether part or all of the overflow grooves 11 are designed to expand downward, it is to better adapt to different mold structures 100 and ensure the controllability and stability of the rubber material breaking at the gate of the injection molding machine.

[0050] Considering that the rubber containing groove 10 has a certain length, therefore, the distance between different positions of the rubber containing groove 10 and the nozzle 200 of the injection molding machine is different, and therefore the traction force provided by the overflow groove 11 corresponding to different positions of the rubber containing groove 10 to the waste rubber material is also different. In view of this, in some embodiments, the plurality of overflow grooves 11 includes first overflow grooves 11a and second overflow grooves 11b, and the sizes of the upper ports of the first overflow grooves 11a and the second overflow grooves 11b are different. According to the need for traction of each overflow groove 11, by setting the size difference of the upper ports of the first overflow grooves 11a and the second overflow grooves 11b corresponding to different positions of the rubber containing groove 10, the volume of the waste rubber material in the first overflow grooves 11a and the second overflow grooves 11b can be adjusted.

[0051] It should be noted that the sizes of the lower ports of the first overflow grooves 11a and the second overflow grooves 11b can be kept the same or set to different sizes. The flexibility of this design allows them to adapt to different production needs. When the sizes of the upper ports and the lower ports of the first overflow grooves 11a and the second overflow grooves 11b are set to different sizes, it means that they need to match ejector rods 21 of different diameters. Such a design can ensure a higher matching degree between the ejector rod 21 and the overflow groove 11, thereby improving the efficiency of production and the quality of products.

[0052] The present application does not limit the specific positions of the first overflow groove 11a and the second overflow groove 11b. In some embodiments, the first overflow groove 11a is located in the middle of the glue containing groove 10, and the second overflow groove 11b is located at the edge of the glue containing groove 10. In another embodiment, the first overflow groove 11a and the second overflow groove 11b are separately arranged on both sides of the glue containing groove 10.

[0053] For the design of the overflow groove 11, in some embodiments, please refer to Figure 5 , the first overflow groove 11a is gradually outwardly expanded downward.

[0054] Specifically, the first overflow groove 11a can be uniformly expanded or segmented, for example, the first overflow groove 11a can include two overflow segments arranged in the up-down direction, both of which are gradually expanded downward, but the expansion trend of the lower overflow segment is greater than that of the upper overflow segment. According to the specific product structure and the size of the glue flow channel, the appropriate overflow groove design is selected to achieve the best production effect.

[0055] In another embodiment, please refer to Figure 6 , the second overflow groove 11b includes a first groove segment 111 and a second groove segment 112 arranged in the up-down direction, the first groove segment 111 is gradually inwardly contracted downward, and the second groove segment 112 is gradually outwardly expanded downward. That is, the cross-sectional area of the second overflow groove 11b is first reduced and then increased, the first groove segment 111 facilitates the inflow of glue, and the second groove segment 112 provides traction for waste glue. It should be noted that the size of the upper port of the first groove segment 111 and the lower port of the second groove segment 112 can be the same or different.

[0056] It should be noted that the ejection assembly 2 specifically includes an ejection plate 22, a plurality of ejector pins are fixed by the ejection plate 22, and the ejection plate 22 can move in the up-down direction under the action of mechanical force. In some embodiments, the ejection plate 22 is directly driven to move by the top roller of the injection molding machine, and in other embodiments, an oil cylinder is arranged on the lower mold base 1 and connected with the ejection plate 22, and the ejection plate 22 is driven to move by the extension and retraction of the oil cylinder.

[0057] The first panel 221 is located above, and the second panel 222 is located below. In order to ensure that the two panels can be firmly combined together, screws are used for locking treatment, so that the first panel 221 and the second panel 222 are firmly connected. This connection mode not only effectively improves the stability of the overall structure, but also enables the two panels to work together to limit the top rod 21. The top rod 21 is a key component in the ejection assembly 2, and the positioning and installation precision directly affects the running effect of the whole system. Therefore, through the close cooperation and joint action of the first panel 221 and the second panel 222, the position of the top rod 21 can be accurately limited, so as to ensure that the top rod 21 meets the expected precise positioning requirement in the installation process, and provides a strong guarantee for the stable operation of the whole device.

[0058] The ejection assembly 2 should include product ejection and waste ejection, which can be fixed by the same ejection plate 22, or by setting two ejection plates 22 in the up-down direction. The multiple top rods in the product ejection are used to contact the injection molded part 300, and its function is to eject the injection molded part 300. The multiple top rods 21 in the waste ejection are used to contact the waste rubber, and its function is to eject the waste rubber. The product ejection and the waste ejection move synchronously.

[0059] In the technical scheme of the present application, please combine Figure 1 and Figure 2The mold cavity 400 has two, the glue tank 10 is located between the two mold cavities 400, and is communicated with the two mold cavities 400, three columnar overflow glue grooves 11 are arranged on the lower mold base 1, the middle part of the glue tank 10 corresponds to the glue nozzle 200 of the injection molding machine, the three overflow glue grooves 11 include a first overflow glue groove 11a and two second overflow glue grooves 11b, the first overflow glue groove 11a corresponds to the middle part of the glue tank 10, and the two second overflow glue grooves 11b correspond to the two ends of the glue tank 10; the groove depth of each overflow glue groove 11 is 13 mm. After the mold is closed, the glue nozzle 200 of the injection molding machine injects liquid glue, the glue tank 10 and the overflow glue groove 11 are filled with plastic, and after the glue completely fills the two mold cavities 400, the glue injection is stopped, and the glue is shaped after a certain period of time. At this time, two injection molded parts 300 are formed in the mold, and waste glue is located between the two injection molded parts 300 and connects the two injection molded parts 300. After the mold is opened, the upper mold base and the lower mold base 1 are separated, based on the structural design of the first overflow glue groove 11a and the second overflow glue groove 11b, a part of the waste glue is left in the three overflow glue grooves 11, and at the same time, under the action of the mechanical force of the injection molding machine, the mold continues to be opened. When the mold is opened, the entire lower mold base 1 retreats, the glue in the three overflow glue grooves 11 pulls the waste glue as a whole to retreat with the lower mold base 1, and as the distance of the retreat of the lower mold base 1 increases, the pulling force of the glue in the three overflow glue grooves 11 on the glue nozzle 200 of the injection molding machine also increases. With the increasing pulling force, the connection between the waste glue, the two injection molded parts 300 and the glue nozzle 200 of the injection molding machine is finally pulled off. That is, two independent injection molded parts 300 and an independent whole piece of waste glue are obtained. Finally, the ejection action is performed, the ejector rod matched with the injection molded part 300 and the ejector rod 21 matched with the waste glue are simultaneously lifted under the action of the ejection assembly, so that the injection molded part 300 and the waste glue are ejected together. After taking out, the mold is closed again to realize the injection molding of the product in the next cycle.

[0060] The present application effectively solves the problem of insufficient stability in the glue breaking process at the gate by a simple and ingenious design scheme, ensures the structural strength and reliability of the lower mold base 1 and the ejector rod 21, reduces the risk of breaking of the ejector rod 21, and simplifies the maintenance process. The scheme can be targeted for rectification and optimization on the basis of the existing mold structure 100. Through the implementation of the scheme, not only the production efficiency is significantly improved, the production cost is reduced, but also the product quality is greatly improved and promoted.

[0061] The above is only a preferred embodiment of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation made on the basis of the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection range of the present application.

Claims

1. A mold structure comprising an upper mold base and a lower mold base disposed in a vertical direction, wherein the upper mold base and the lower mold base define a mold cavity when the mold is closed, characterized in that, The upper end of the lower mold base is formed with a glue-receiving groove, which is connected to the mold cavity. The bottom surface of the glue-receiving groove is recessed with multiple overflow grooves, and the lower end of the lower mold base is provided with multiple ejection channels that connect the multiple overflow grooves. The mold structure also includes an ejection assembly located below the lower mold base. The ejection assembly includes multiple ejector rods, which are movably inserted into the corresponding ejection channels in the vertical direction. The plurality of overflow channels include a first overflow channel and a second overflow channel, wherein the upper ports of the first overflow channel and the second overflow channel are configured with different dimensions; The first overflow groove is positioned downwards and gradually expands outwards. The second overflow tank includes a first tank segment and a second tank segment arranged sequentially in the vertical direction. The first tank segment is arranged to gradually shrink inwards downwards, and the second tank segment is arranged to gradually expand outwards downwards. The lower ends of the first and second overflow grooves are different in size to match top rods of different diameters; The mold cavity has two, and the glue-receiving groove is located between the two mold cavities and is connected to the two mold cavities. The middle of the glue-receiving groove corresponds to the glue nozzle of the injection molding machine. The first overflow groove is cylindrical, with the upper end of the first overflow groove having a radius of R1 and the lower end having a radius of R2, wherein 0.4mm≤R2-R1≤0.6mm; The first overflow groove is located in the middle of the glue container, and the second overflow groove is located at the edge of the glue container.

2. The mold structure as described in claim 1, characterized in that, The depth of the plurality of overflow grooves is 10–14 mm.

3. The mold structure as described in claim 1, characterized in that, The glue-containing groove is used to connect to the nozzle of the injection molding machine to serve as a glue injection channel.

4. The mold structure as described in claim 1, characterized in that, The upper end of the push rod has a protruding boss at the middle, and the boss is located in the overflow groove when the mold structure is closed.

5. The mold structure as described in claim 4, characterized in that, The peripheral side of the boss is inclined to form an inclined annular surface, and the angle between the inclined annular surface and the center line of the top rod is 15°~20°.

6. The mold structure as described in claim 4, characterized in that, The height of the boss is 2.8 to 3.2 mm.

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