Injection mold structure of pet traction chain

Abstract

The utility model discloses an injection mold structure of a pet traction chain, which comprises a lower mold assembly, a lower mold assembly and a first translation driving mechanism, the lower mold assembly comprises a fixed mold base, a lower mold plate, a lower mold core and a first translation driving mechanism, a lower mold cavity is provided with a first longitudinal lower cavity, the lower mold core is provided with a second longitudinal lower cavity, and the lower mold core is connected to the first translation driving mechanism; the upper die assembly comprises a movable die base, a sliding guide mechanism, an upper die plate, two steering linkage blocks and two upper die cores, the sliding guide mechanism is connected with the movable die base and the upper die plate, the two steering linkage blocks are connected to the lower portion of the movable die base, first inclined faces are arranged at the bottoms of the steering linkage blocks, and the upper die cores are connected to the upper die cavity in a sliding mode. A transverse cavity is formed in the bottom of each upper mold core, a longitudinal upper cavity is formed in one side of each upper mold core, a second inclined face is arranged on the top of each upper mold core, and a transverse spring is connected between the two upper mold cores. The injection molding device is high in injection molding production efficiency, simple and compact in structure, capable of effectively ensuring the stripping separation effect and good in injection molding production effect.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to an injection mold structure of a pet traction chain. Background Art

[0002] A mold is a tool used to make molded objects. An injection mold is a mold used to mold molten plastic. At a certain temperature, the completely molten plastic material is stirred by a screw and injected into the mold cavity at high pressure. After cooling and solidification, a molded product is obtained.

[0003] A pet leash is a device used to leash pets, usually composed of multiple ring buckles connected together. In related technologies, this chain is usually made by injection molding to produce multiple independent ring buckles, and the chain is assembled by setting notches in the ring buckles. The assembly process is cumbersome and the production efficiency is low. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention proposes an injection mold structure for a pet traction chain, which can effectively simplify the production steps of the chain, has high production efficiency, and low production cost.

[0005] According to an embodiment of the present invention, an injection mold structure for a pet traction chain includes:

[0006] A lower mold assembly includes a fixed mold base, a lower mold plate, a lower mold core, and a first translation drive mechanism. The lower mold plate is connected to the fixed mold base. The lower mold plate is provided with a lower mold cavity. A first longitudinal lower mold cavity is provided on one side wall of the lower mold cavity. The lower mold core is provided in the lower mold cavity. A second longitudinal lower mold cavity matching the first longitudinal lower mold cavity is provided on one side of the lower mold core. The lower mold core is connected to the first translation drive mechanism. The first translation drive mechanism is used to drive the lower mold core to translate relative to the second longitudinal lower mold cavity.

[0007] The upper mold assembly includes a movable mold base, a sliding guide mechanism, an upper mold plate, two steering linkage blocks and two upper mold cores. The sliding guide mechanism is respectively connected to the movable mold base and the upper mold plate. The sliding guide mechanism is used to limit the longitudinal position of the upper mold plate relative to the movable mold base. The upper mold plate is located directly above the lower mold plate. The upper mold plate is provided with an upper mold cavity. The two steering linkage blocks are both connected to the bottom of the movable mold base. The bottom of each steering linkage block is provided with a first inclined surface that is inclined from top to bottom away from the center of the upper mold cavity. The two upper mold cores are both slidably connected to the upper mold cavity. The bottom of each upper mold core is provided with a transverse cavity. The two transverse cavities are used to cooperate with the top surface of the lower mold plate to form a transverse injection cavity. Each upper mold core is close to the upper mold base. A longitudinal upper cavity is provided on one side near the center of the upper mold cavity. The two longitudinal upper cavities are used to cooperate with the first longitudinal lower cavity and the second longitudinal lower cavity to form a longitudinal injection cavity. The transverse injection cavity and the longitudinal injection cavity are used to inject pet traction chains. The top of each upper mold core is provided with a second inclined surface matching the corresponding first inclined surface, and the second inclined surface abuts against the bottom of the first inclined surface. The two steering linkage blocks are used to push the two upper mold cores closer to each other. A transverse spring is connected between the two upper mold cores. The transverse spring is used to make the two upper mold cores form a movement trend away from each other. An injection flow channel for connecting the longitudinal upper cavity and the transverse cavity is provided on the side of each upper mold core near the center of the upper mold cavity.

[0008] In this embodiment, the first longitudinal lower cavity includes n independent first semi-annular grooves, where n is an integer greater than 1; the second longitudinal lower cavity includes n independent second semi-annular grooves; the longitudinal upper cavity includes n independent third semi-annular grooves; the first semi-annular grooves, the second semi-annular grooves and the third semi-annular grooves all extend in a direction perpendicular to the horizontal plane; the longitudinal injection cavity includes n longitudinal annular cavities all perpendicular to the horizontal plane; the transverse cavity includes m independent transverse semi-annular grooves, where m is an integer greater than 1; the transverse semi-annular grooves extend in a direction parallel to the horizontal plane; the transverse injection cavity includes m transverse annular cavities all parallel to the horizontal plane; the longitudinal annular cavities and the transverse annular cavities are connected by a ring.

[0009] In this embodiment, the injection runner includes a main runner, a first branch runner, a second branch runner and a third branch runner. One end of the main runner is connected to the first branch runner, and the other end of the main runner is used to connect to the injection head of the injection molding machine. There are n second branch runners, and one end of each second branch runner is connected to the first branch runner, and the other end of each second branch runner is respectively connected to the corresponding third semi-annular groove. There are n third branch runners, and the third branch runner is in an inverted T shape. The three ends of the third branch runner are respectively connected to the third semi-annular groove and the two adjacent transverse semi-annular grooves.

[0010] In this embodiment, the first semi-annular groove, the second semi-annular groove, the third semi-annular groove and the transverse semi-annular groove are all semi-annular groove structures with wavy edges.

[0011] In this embodiment, the lower mold assembly also includes a second translation drive mechanism, a stripping ejector plate and a stripping ejector pin. The lower mold plate is also provided with a stripping clearance cavity and a stripping ejector hole. The opposite ends of the stripping ejector hole are respectively connected to the first longitudinal lower cavity and the stripping clearance cavity. The stripping ejector plate is arranged in the stripping clearance cavity. The stripping ejector plate is connected to the second translation drive mechanism. The stripping ejector pin is connected to the side of the stripping ejector plate close to the first longitudinal lower cavity. The stripping ejector pin is passed through the stripping ejector hole.

[0012] In this embodiment, a first receiving groove is provided on one side of each upper mold core close to the center of the upper mold cavity, and the opposite ends of the transverse spring are respectively provided in the two opposite first receiving grooves.

[0013] In this embodiment, guide sliders are provided on the inner walls on opposite sides of the upper mold cavity, guide slots are provided on opposite sides of each upper mold core, and each guide slider is slidably connected to the corresponding guide slot.

[0014] In this embodiment, an inclined groove is provided on the top of the upper mold core, and an inclined slider is provided on the bottom of the steering linkage block. The inclined slider is slidably connected to the inclined groove, and the inclined groove is inclined from top to bottom away from the center of the upper mold cavity.

[0015] In this embodiment, the movable mold base is provided with a guide hole, the upper mold plate is connected to a guide column, the upper mold assembly also includes a longitudinal spring, the guide column is passed through the guide hole, the top of the guide column is provided with a limit block, the longitudinal spring is sleeved outside the guide column, and the opposite ends of the longitudinal spring are respectively connected to the movable mold base and the upper mold plate, so that the upper mold plate forms a tendency to move away from the movable mold base.

[0016] In this embodiment, a second receiving groove connected to the top of the guide hole is provided on the top of the movable mold base, and the limiting block is slidably connected to the second receiving groove.

[0017] The embodiments of the present invention have at least the following beneficial effects:

[0018] By distributing the cavities along the transverse and longitudinal directions, the complex structure of the pet traction chain can be molded in one go, which can effectively simplify the production process, shorten the production cycle, and has high injection molding production efficiency, which can effectively reduce production costs. When closing the mold, the lower mold core cooperates with the lower template through the first translation drive mechanism, and the mold closing force drives the two upper mold cores to approach and abut each other through the action of the steering linkage block, thereby forming a complete buckle chain injection molding space for injection molding of pet traction chains, which can effectively ensure the reliability of the injection molding process. The structure is simple and compact, which can effectively reduce the mold cost; when opening the mold, the upper template and the lower template are away from each other, the lower mold core is separated from the inner wall of the lower mold cavity where the first longitudinal lower cavity is located, and the two upper mold cores are separated from each other under the action of the transverse spring, and each cavity can be detached from the injection-molded pet traction chain from different dimensions, which can effectively ensure the effect of stripping and separation, and the injection molding production effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the injection mold structure of the pet traction chain according to an embodiment of the utility model when the mold is opened;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the injection mold structure of the pet traction chain according to an embodiment of the utility model when the mold is opened from another perspective;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the injection mold structure of the pet traction chain according to an embodiment of the utility model when the mold is closed;

[0023] Figure 4 This is a schematic diagram of the exploded structure of the injection mold structure of the pet traction chain according to an embodiment of the present utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of A;

[0025] Figure 6 This is a perspective structural diagram of the pet traction chain according to an embodiment of the utility model when the injection mold structure is closed from a top view;

[0026] Figure 7 For the Figure 6 Schematic diagram of the cross-sectional structure of section B-B';

[0027] Figure 8 For the Figure 6 Schematic diagram of the cross-sectional structure of C-C';

[0028] Figure 9 for Figure 8 Schematic diagram of the enlarged structure of D in the middle.

[0029] Reference numerals:

[0030] Lower mold assembly 1000, fixed mold base 1100, lower mold plate 1200, lower mold cavity 1210, first longitudinal lower mold cavity 1220, first semi-annular groove 1221, stripping clearance cavity 1230, stripping ejection hole 1240, lower mold core 1300, second longitudinal lower mold cavity 1310, second semi-annular groove 1311, first translation drive mechanism 1400, second translation drive mechanism 1500, stripping ejector plate 1600, stripping ejector pin 1700;

[0031] Upper mold assembly 2000, movable mold base 2100, guide hole 2110, second receiving groove 2120, sliding guide mechanism 2200, guide column 2210, limit block 2211, longitudinal spring 2220, upper mold plate 2300, upper mold cavity 2310, guide slider 2320, steering linkage block 2400, first inclined surface 2410, inclined slider 2420, upper mold core 2500, transverse cavity 2510, transverse semi-annular groove 2511, longitudinal upper cavity 2520, third semi-annular groove 2521, second inclined surface 2530, first receiving groove 2540, guide slide 2550, inclined slide 2560, transverse spring 2600, injection runner 2700, main channel 2710, first branch channel 2720, second branch channel 2730, third branch channel 2740. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, left, right, front, back, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of this utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] A mold is a tool used to create shaped objects. Injection molds are used to shape molten plastic. At a certain temperature, the completely molten plastic material is stirred by a screw and injected into the mold cavity at high pressure. After cooling and solidification, the molded product is obtained. A pet leash is a device used to leash pets, typically consisting of multiple ring buckles connected together. In related art, such chains are typically manufactured by injection molding multiple independent ring buckles, and the chain is assembled by providing notches in the ring buckles. This cumbersome assembly process results in low production efficiency and high production costs. Furthermore, the notches in this chain structure reduce the stability of the pet leash.

[0037] The following is the attached Figure 1 To the attached Figure 9 , describing the injection mold structure of the pet traction chain of the embodiment of the utility model, which can effectively simplify the production steps of the chain, with high production efficiency and low production cost.

[0038] Reference Figures 1 to 9 The injection mold structure of a pet traction chain according to an embodiment of the present invention includes:

[0039] The lower mold assembly 1000 includes a fixed mold base 1100, a lower mold plate 1200, a lower mold core 1300 and a first translation drive mechanism 1400. The lower mold plate 1200 is connected to the fixed mold base 1100. The fixed mold base 1100 is used to connect to the machine fixing plate of the external injection molding machine. The lower mold plate 1200 is provided with a lower mold cavity 1210. A first longitudinal lower mold cavity 1220 is provided on one side of the cavity wall of the lower mold cavity 1210. The lower mold core 1300 is provided in the lower mold cavity 1210. A second longitudinal lower mold cavity 1310 matching the first longitudinal lower mold cavity 1220 is provided on one side of the lower mold core 1300. The second longitudinal lower mold cavity 1310 is positioned at the lower mold cavity 1210. On the side of the lower mold core 1300 close to the first longitudinal lower mold cavity 1220, the lower mold core 1300 is connected to the first translation drive mechanism 1400. The first translation drive mechanism 1400 is used to drive the lower mold core 1300 to move closer to or away from the second longitudinal lower mold cavity 1310, so as to achieve the merging and separation between the first longitudinal lower mold cavity 1220 and the second longitudinal lower mold cavity 1310. After the first longitudinal lower mold cavity 1220 and the second longitudinal lower mold cavity 1310 are merged, a lower injection molding chamber with an opening only at the top can be formed. Preferably, the first translation drive mechanism 1400 is a cylinder driven in the horizontal direction.

[0040] The upper mold assembly 2000 includes a movable mold base 2100, a sliding guide mechanism 2200, an upper mold plate 2300, two steering linkage blocks 2400 and two upper mold cores 2500. The movable mold base 2100 is used to connect the push movable plate of the external injection molding machine. The upper mold assembly 2000 is located directly above the lower mold assembly 1000, and the upper mold plate 2300 is located below the movable mold base 2100. The sliding guide mechanism 2200 connects the movable mold base 2100 and the upper mold plate 2300 respectively. The sliding guide mechanism 2200 is used to limit the longitudinal position of the upper mold plate 2300 relative to the movable mold base 2100, that is, the longitudinal position is the height position perpendicular to the horizontal plane. The upper mold plate 2300 is located directly above the lower mold plate 1200, and an upper mold is provided under the upper mold plate 2300. Cavity 2310, two steering linkage blocks 2400 are fixedly connected to the bottom of the movable mold base 2100, and the bottom of each steering linkage block 2400 is provided with a first inclined surface 2410 inclined from top to bottom away from the center of the upper mold cavity 2310, and the two upper mold cores 2500 are connected to the upper mold cavity 2310 in a transverse sliding manner. The two upper mold cores 2500 are restricted to slide horizontally in the upper mold cavity 2310, and the bottom of each upper mold core 2500 is provided with a transverse cavity 2510. The two transverse cavities 2510 are used to cooperate with the top surface of the lower template 1200 to form a transverse injection cavity. Each upper mold core 2500 is provided with a longitudinal upper cavity 2520 on one side close to the center of the upper mold cavity 2310. The two longitudinal upper cavities 2520 are used to cooperate with the first longitudinal lower mold The cavity 1220 and the second longitudinal lower cavity 1310 form a longitudinal injection cavity. The transverse injection cavity and the longitudinal injection cavity are independent of each other in three-dimensional space. The horizontal projection of the transverse injection cavity intersects with the horizontal projection of the longitudinal injection cavity. The transverse injection cavity and the longitudinal injection cavity obtained by closing the mold constitute a buckle chain injection space. The transverse injection cavity and the longitudinal injection cavity are used for combined injection molding of pet traction chains. The top of each upper mold core 2500 is provided with a second inclined surface 2530 matching the corresponding first inclined surface 2410. The second inclined surface 2530 abuts against the bottom of the first inclined surface 2410. The two steering linkage blocks 2400 are used to push the two upper mold cores 2500 closer to each other through the guidance of the first inclined surface 2410 and the second inclined surface 2530, so that the two upper mold cores 2500 0 are abutted against each other, and the two longitudinal upper cavities 2520 are merged to form an upper injection molding cavity with only an opening on the bottom surface. The upper injection molding cavity is used to cooperate with the lower injection molding cavity to form a longitudinal injection molding cavity. The upper mold assembly 2000 also includes a transverse spring 2600. A transverse spring 2600 is connected between the two upper mold cores 2500. The transverse spring 2600 is used to form a movement trend of the two upper mold cores 2500 away from each other in the horizontal direction. An injection molding runner 2700 for connecting the longitudinal upper mold cavity 2520 and the transverse mold cavity 2510 is provided on one side of each upper mold core 2500 close to the center of the upper mold cavity 2310. By arranging the injection molding runner 2700 on one side of the upper mold core 2500, the demoulding effect of the runner gate waste can be effectively ensured.

[0041] The working process is:

[0042] Clamping, reference Figure 3 、 7 , 8 and 9, the first translation drive mechanism 1400 drives the lower mold core 1300 to move close to the first longitudinal lower cavity 1220, so that the first longitudinal lower cavity 1220 and the second longitudinal lower cavity 1310 are combined to form a lower injection cavity with an opening only on the top surface. The external injection molding machine drives the movable mold base 2100 to descend by pushing the movable plate, and the upper template 2300 abuts against the lower template 1200. During the gradual descent of the movable mold base 2100, the upper template 2300 and the movable mold base 2100 approach each other, and the first inclined surface 2410 and the second inclined surface 2530 interact with each other. The longitudinal driving force of the steering linkage block 2400 is converted into a transverse driving force acting on the upper mold core 2500, so that the two upper mold cores 2500 are close to each other and in contact with each other. The two longitudinal upper mold cavities 2520 are merged to cooperate with the first longitudinal lower mold cavity 1220 and the second longitudinal lower mold cavity 1310 to form a longitudinal injection cavity. The two transverse mold cavities 2510 are merged to cooperate with the top surface of the lower mold plate 1200 to form a transverse injection cavity. The injection molding machine injects molten material into the longitudinal upper mold cavity 2520 and the transverse cavity 2510 through the injection runner 2700. After cooling, the pet traction chain is obtained.

[0043] Mold opening, reference Figure 1 and 2 As shown, the external injection molding machine drives the movable mold base 2100 to rise by pushing the movable plate, and the upper mold plate 2300 separates from the lower mold plate 1200 and rises. The two longitudinal upper cavities 2520 and the two transverse cavities 2510 all separate from the lower mold plate 1200 and rise. In the process of the movable mold base 2100 gradually rising, the two upper mold cores 2500 move away from each other under the elastic force of the transverse spring 2600, and the two longitudinal upper cavities 2520 are separated from each other. At this time, the pet traction chain is separated from the longitudinal upper cavity 2520 and the transverse cavity 2510 of the upper mold core 2500, and the first translation drive mechanism 1400 drives the lower mold core 1300 to move away from the first longitudinal lower cavity 1220 to separate the first longitudinal lower cavity 1220 from the second longitudinal lower cavity 1310, thereby separating the pet traction chain.

[0044] By distributing the cavities in the transverse and longitudinal directions, the complex structure of the pet traction chain can be molded in one step, which can effectively simplify the production process, shorten the production cycle, and increase the injection molding production efficiency, which can effectively reduce the production cost. When closing the mold, the lower mold core 1300 is matched with the lower template 1200 through the first translation drive mechanism 1400. The mold closing force drives the two upper mold cores 2500 to approach and abut each other through the action of the steering linkage block 2400, thereby forming a complete buckle chain injection molding space for injection molding of pet traction chains, which can effectively ensure the reliability of the injection molding process, the action is coherent and reliable, the injection molding precision is high, the structure is simple and compact, and the mold cost can be effectively reduced. When the mold is opened, the upper template 2300 and the lower template 1200 move away from each other, the lower mold core 1300 is separated from the inner wall of the lower mold cavity 1210 where the first longitudinal lower cavity 1220 is located, and the two upper mold cores 2500 are separated from each other under the action of the transverse spring 2600. The first longitudinal lower cavity 1220, the second longitudinal lower cavity 1310 and the two longitudinal upper cavities 2520 move in different directions respectively, and the two transverse cavities 2510 separate from each other and move away from the lower template 1200 synchronously. Each cavity can be detached from the pet traction chain made by injection molding from different dimensions, which can effectively ensure the dematerialization and separation effect of the pet traction chain with complex structure, and the injection molding production effect is good.

[0045] It can be understood that the first longitudinal lower cavity 1220 includes n independent first semi-annular grooves 1221, a gap is formed between each two adjacent first semi-annular grooves 1221, and each first semi-annular groove 1221 is independent of each other, n is an integer greater than 1, that is, n is an integer of at least 2, the second longitudinal lower cavity 1310 includes n independent second semi-annular grooves 1311, a gap is formed between each two adjacent second semi-annular grooves 1311, and each second semi-annular groove 1311 is independent of each other, each longitudinal upper cavity 2520 includes n independent third semi-annular grooves 2521, a gap is formed between each two adjacent third semi-annular grooves 2521, and each third semi-annular groove 2521 is independent of each other, all of the first semi-annular grooves 1221, the second semi-annular grooves 1311 and the third semi-annular grooves 2521 extend in a direction perpendicular to the horizontal plane, and the notch of the first semi-annular groove 1221 and the second semi-annular groove The notches of the shaped grooves 1311 are all facing the center of the lower mold cavity 1210, both ends of the first semi-annular groove 1221 are both located at the top surface of the lower template 1200, and both ends of the second semi-annular groove 1311 are both located at the top surface of the lower mold core 1300. After the first longitudinal lower mold cavity 1220 and the second longitudinal lower mold cavity 1310 are merged, n lower injection molding chambers with only an opening on the top and a semi-annular shape are formed. The notches of the third semi-annular groove 2521 are facing the center of the upper mold cavity 2310, and both ends of the third semi-annular groove 2521 are both located at the bottom surface of the upper mold core 2500. After the two longitudinal upper mold cavities 2520 are merged, n upper injection molding chambers with only an opening on the bottom and a semi-annular shape are formed. The longitudinal injection molding cavity includes n longitudinal annular cavities that are all perpendicular to the horizontal plane and independent of each other, that is, the upper injection molding cavity and the lower injection molding cavity are merged to form a longitudinal injection molding cavity with n independent longitudinal annular cavities, and each longitudinal annular cavity in the longitudinal injection molding cavity is perpendicular to the horizontal plane.

[0046] Each transverse cavity 2510 includes m independent transverse semi-annular grooves 2511, m is an integer greater than 1, that is, m is an integer of at least 2, n-1≤m≤n+1, and all transverse semi-annular grooves 2511 extend in a direction parallel to the horizontal plane. The transverse injection molding cavity includes m transverse annular cavities that are parallel to the horizontal plane and independent of each other, that is, the transverse cavity 2510 cooperates with the top surface of the lower template 1200 to form a transverse injection molding cavity with m independent transverse annular cavities, and each annular structure in the transverse injection molding cavity is parallel to the horizontal plane. The longitudinal annular cavity and the transverse annular cavity are connected in a loop in three-dimensional space, and the transverse injection molding cavity and the longitudinal injection molding cavity form a loop-type chain injection molding space that is alternately locked in the transverse and longitudinal directions. The loop-type chain injection molding space can be used to produce interlocking pet traction chains, which can effectively eliminate the steps of assembling the buckles required in traditional technologies, significantly improve production efficiency, and effectively reduce production difficulty.

[0047] It can be understood that the injection runner 2700 includes a main runner 2710, a first branch runner 2720, a second branch runner 2730 and a third branch runner 2740. One end of the main runner 2710 is connected to the first branch runner 2720, and the other end of the main runner 2710 is used to connect to the injection head of an external injection molding machine. The injection head of the injection molding machine injects molten plastic into the main runner 2710. There are n second branch runners 2730, one end of each second branch runner 2730 is connected to the first branch runner 2720, and each second branch runner 2730 is connected to the first branch runner 2720. The other end of 730 is connected to each corresponding third semi-annular groove 2521. There are n third branch runners 2740, each in an inverted T-shape. The three ends of each third branch runner 2740 are connected to each corresponding third semi-annular groove 2521 and the two adjacent transverse semi-annular grooves 2511 on both sides. That is, each third semi-annular groove 2521 is connected to a third branch runner 2740, and the bottom ends of the third branch runner 2740 are respectively connected to the two adjacent transverse semi-annular grooves 2511. Preferably, the movable mold base 2100 is further provided with an injection hole for connecting to the other end of the main runner 2710. The main runner 2710 is connected to the injection head of an external injection molding machine through the injection hole.

[0048] Specifically, the cross-sectional area of the second diversion channel 2730 gradually decreases from the first diversion channel 2720 toward the third semi-annular groove 2521, and the opening areas at the three ends of the third diversion channel 2740 are all smaller than the middle cross-sectional area of the third diversion channel 2740, which can effectively reduce the difficulty of the waste at the flow channel outlet to separate from the pet traction chain body, and the separation efficiency is high.

[0049] It can be understood that the first semi-annular groove 1221, the second semi-annular groove 1311, the third semi-annular groove 2521 and the transverse semi-annular groove 2511 are all semi-annular groove structures with concave and convex wavy edges, which can produce a pet traction chain with a wavy buckle structure.

[0050] It can be understood that the lower mold assembly 1000 also includes a second translation drive mechanism 1500, a stripping top plate 1600 and a stripping ejector pin 1700. The lower mold plate 1200 is also provided with a stripping clearance cavity 1230 and a stripping top hole 1240. The stripping clearance cavity 1230 is located on one side of the lower mold cavity 1210. The opposite ends of the stripping top hole 1240 are respectively connected to the first longitudinal lower mold cavity 1220 and the stripping clearance cavity 1230. The stripping top plate 1600 is slidably connected to the stripping clearance cavity 1230. Connected to the driving end of the second translation drive mechanism 1500, the stripping ejector pin 1700 is connected to the side of the stripping ejector plate 1600 close to the first longitudinal lower cavity 1220, and the stripping ejector pin 1700 is passed through the stripping ejector hole 1240. The second translation drive mechanism 1500 is used to drive the stripping ejector plate 1600 to move horizontally in the stripping clearance cavity 1230, thereby driving the stripping ejector pin 1700 to slide horizontally in the stripping ejector hole 1240. Preferably, the second translation drive mechanism 1500 is a cylinder driven in the horizontal direction.

[0051] After the injection molding is completed, the external injection molding machine drives the movable mold base 2100 to rise by pushing the movable plate, and the upper mold plate 2300 separates from the lower mold plate 1200 and rises. The two longitudinal upper cavities 2520 and the two transverse cavities 2510 are separated from the lower mold plate 1200 and rise. In the process of the movable mold base 2100 gradually rising, the transverse spring 2600 drives the two upper mold cores 2500 to move away from each other, and the two longitudinal upper cavities 2520 separate from each other. At this time, the pet traction chain separates from the longitudinal upper cavity 2520 and the transverse cavity 2510 of the upper mold core 2500. 10. The first translation drive mechanism 1400 drives the lower mold core 1300 to move away from the first longitudinal lower mold cavity 1220, and the pet traction chain moves away from the second longitudinal lower mold cavity 1310. The second translation drive mechanism 1500 drives the stripping top plate 1600 to move along the stripping clearance cavity 1230 close to the lower mold cavity 1210, and the stripping ejector pin 1700 moves along the stripping top hole 1240 close to the first longitudinal lower mold cavity 1220, thereby pushing the pet traction chain out of the first longitudinal lower mold cavity 1220, and realizing a reliable stripping action.

[0052] Specifically, a translation limit structure is provided between the lower mold core 1300 and the lower mold cavity 1210, which is used to limit the movement trajectory of the lower mold core 1300 in the lower mold cavity 1210, such as: first limit bars are provided at the bottom of the opposite sides of the lower mold core 1300, and second limit bars are provided at the top of the opposite sides of the lower mold cavity 1210. The two first limit bars are respectively abutted against the bottom of the two second limit bars, and the fixed mold base 1100 is abutted against the bottom of the two first limit bars.

[0053] It can be understood that each upper mold core 2500 is provided with a first receiving groove 2540 on one side close to the center of the upper mold cavity 2310, and the opposite ends of the transverse spring 2600 are respectively provided in two opposite first receiving grooves 2540. By providing the first receiving grooves 2540 to accommodate the transverse spring 2600, when the mold is closed, the transverse spring 2600 is completely received in the first receiving grooves 2540, which can ensure that the two upper mold cores 2500 can achieve close abutment, thereby ensuring that the two longitudinal upper cavities 2520 can be tightly pieced together to form an upper injection molding chamber with an opening only at the bottom.

[0054] It is understood that guide sliders 2320 are provided on the inner walls of the upper mold cavity 2310 on opposite sides, and guide grooves 2550 are provided on opposite sides of each upper mold core 2500. Each guide slider 2320 is slidably connected to the corresponding guide groove 2550. The guide sliders 2320 and the guide grooves 2550 can effectively limit the movement trajectory of the upper mold core 2500 to be parallel to the horizontal plane and parallel to the line connecting the two upper mold cores 2500, so that the two upper mold cores 2500 can only move toward or away from each other along the horizontal plane, which can effectively improve the reliability of the movement of the upper mold core 2500. The guide grooves 2550 can be configured as T-shaped grooves, and the guide sliders 2320 can be configured as T-shaped sliders.

[0055] Specifically, the upper template 2300 includes a semi-circular frame and a closing strip. The semi-circular frame is U-shaped. The closing strip is connected to the U-shaped opening of the semi-circular frame to achieve the closure of the semi-circular frame. The upper mold cavity 2310 is the space surrounded by the closing strip and the semi-circular frame. By splitting the upper template 2300 into a semi-circular frame and a closing strip, the upper mold core 2500 can be effectively and conveniently installed to ensure that the guide slider 2320 can be effectively inserted into the guide groove 2550. Preferably, the closing strip and the semi-circular frame can be fixedly connected by screws.

[0056] It can be understood that an inclined groove 2560 is provided at the top of the upper mold core 2500, and an inclined slider 2420 is provided at the bottom of the steering linkage block 2400. The inclined slider 2420 is slidably connected to the inclined groove 2560. The inclined groove 2560 extends obliquely from top to bottom away from the center of the upper mold cavity 2310. The extension direction of the inclined groove 2560 is parallel to the first inclined surface 2410. The inclined slider 2420 can slide obliquely in the inclined groove 2560. The relative sliding trajectory between the inclined slider 2420 and the inclined groove 2560 is parallel to the first inclined surface 2410. The inclined slider 2420 cooperates with the inclined groove 2560 to effectively improve the reliability of the steering linkage action between the steering linkage block 2400 and the upper mold core 2500. Specifically, the inclined sliding block 2420 is a dovetail-shaped sliding block, and the inclined sliding groove 2560 is a dovetail-shaped sliding groove; in addition, the inclined sliding block 2420 can also be set as an inverted T-shaped sliding block, and the inclined sliding groove 2560 can be an inverted T-shaped sliding groove.

[0057] It can be understood that the movable mold base 2100 is provided with a guide hole 2110, and the sliding guide mechanism 2200 includes a guide column 2210 and a longitudinal spring 2220. The guide column 2210 is fixedly connected to the upper template 2300, and the guide column 2210 is passed through the guide hole 2110. The top of the guide column 2210 is provided with a limit block 2211, which can effectively limit the relative position between the upper template 2300 and the movable mold base 2100, and can effectively prevent the upper template 2300 from completely separating from the movable mold base 2100. The longitudinal spring 2220 is sleeved on the outside of the guide column 2210, and the opposite ends of the longitudinal spring 2220 are respectively connected to the movable mold base 2100 and the upper template 2300, so that the upper template 2300 forms a tendency to move away from the movable mold base 2100. The longitudinal spring 2220 can effectively improve the stability of the mold closing and opening actions during the overall injection molding process.

[0058] Specifically, the guide posts 2210 and the upper template 2300 can be fixedly installed by screws. There are four guide posts 2210, four longitudinal springs 2220 and four guide holes 2110 corresponding to each other.

[0059] It is understood that the top of the movable mold base 2100 is provided with a second receiving groove 2120 connected to the top of the guide hole 2110, the guide hole 2110 is connected to the bottom of the second receiving groove 2120, the limit block 2211 is slidably connected to the second receiving groove 2120, the linear distance of relative motion between the movable mold base 2100 and the upper mold plate 2300 is h, the thickness of the limit block 2211 is d, and the depth of the second receiving groove 2120 is greater than the sum of h and d. This effectively prevents the limit block 2211 from completely disengaging from the second receiving groove 2120 and protruding outside the movable mold base 2100, thereby effectively improving the reliability of the mold opening and closing operations. When four guide posts 2210, four longitudinal springs 2220, and four guide holes 2110 are each provided, the number of second receiving grooves 2120 is also provided to be four.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An injection mold structure for a pet traction chain, characterized in that: include: A lower mold assembly (1000) comprises a fixed mold base (1100), a lower mold plate (1200), a lower mold core (1300) and a first translation drive mechanism (1400), wherein the lower mold plate (1200) is connected to the fixed mold base (1100), the lower mold plate (1200) is provided with a lower mold cavity (1210), a first longitudinal lower mold cavity (1220) is provided on one side wall of the lower mold cavity (1210), the lower mold core (1300) is provided in the lower mold cavity (1210), a second longitudinal lower mold cavity (1310) matching the first longitudinal lower mold cavity (1220) is provided on one side of the lower mold core (1300), the lower mold core (1300) is connected to the first translation drive mechanism (1400), and the first translation drive mechanism (1400) is used to drive the lower mold core (1300) to translate relative to the second longitudinal lower mold cavity (1310); The upper mold assembly (2000) includes a movable mold base (2100), a sliding guide mechanism (2200), an upper mold plate (2300), two steering linkage blocks (2400) and two upper mold cores (2500), wherein the sliding guide mechanism (2200) is respectively connected to the movable mold base (2100) and the upper mold plate (2300), and the sliding guide mechanism (2200) is used to limit the longitudinal position of the upper mold plate (2300) relative to the movable mold base (2100). The upper mold plate (2300) is located directly above the lower mold plate (1200). 2300) is provided with an upper mold cavity (2310), the two steering linkage blocks (2400) are connected to the bottom of the movable mold base (2100), the bottom of each steering linkage block (2400) is provided with a first inclined surface (2410) inclined from top to bottom away from the center of the upper mold cavity (2310), the two upper mold cores (2500) are slidably connected to the upper mold cavity (2310), the bottom of each upper mold core (2500) is provided with a transverse mold cavity (2510), and the two transverse mold cavities (2510) are used to cooperate with the top surface shape of the lower template (1200) A transverse injection molding cavity is formed, and a longitudinal upper mold cavity (2520) is provided on one side of each upper mold core (2500) close to the center of the upper mold cavity (2310). The two longitudinal upper mold cavities (2520) are used to cooperate with the first longitudinal lower mold cavity (1220) and the second longitudinal lower mold cavity (1310) to form a longitudinal injection molding cavity. The transverse injection molding cavity and the longitudinal injection molding cavity are used to injection mold pet traction chains. The top of each upper mold core (2500) is provided with a second inclined surface (2530) that matches the corresponding first inclined surface (2410). The second inclined surface (2530) is against Connected to the lower portion of the first inclined surface (2410), the two steering linkage blocks (2400) are used to push the two upper mold cores (2500) closer to each other, and a transverse spring (2600) is connected between the two upper mold cores (2500). The transverse spring (2600) is used to make the two upper mold cores (2500) form a movement trend away from each other, and each upper mold core (2500) is provided with an injection flow channel (2700) for connecting the longitudinal upper cavity (2520) and the transverse cavity (2510) on one side close to the center of the upper mold cavity (2310).

2. The injection mold structure of a pet traction chain according to claim 1, characterized in that: The first longitudinal lower mold cavity (1220) includes n independent first semi-annular grooves (1221), where n is an integer greater than 1; the second longitudinal lower mold cavity (1310) includes n independent second semi-annular grooves (1311); the longitudinal upper mold cavity (2520) includes n independent third semi-annular grooves (2521); the first semi-annular grooves (1221), the second semi-annular grooves (1311) and the third semi-annular grooves (2521) all extend in a direction perpendicular to the horizontal plane; the longitudinal injection molding cavity includes n longitudinal annular cavities all perpendicular to the horizontal plane; the transverse mold cavity (2510) includes m independent transverse semi-annular grooves (2511), where m is an integer greater than 1; the transverse semi-annular grooves (2511) extend in a direction parallel to the horizontal plane; the transverse injection molding cavity includes m transverse annular cavities all parallel to the horizontal plane; the longitudinal annular cavity and the transverse annular cavity are connected in a ring.

3. The injection mold structure of a pet traction chain according to claim 2, characterized in that: The injection molding runner (2700) includes a main runner (2710), a first branch runner (2720), a second branch runner (2730) and a third branch runner (2740). One end of the main runner (2710) is connected to the first branch runner (2720), and the other end of the main runner (2710) is used to connect to the injection head of the injection molding machine. There are n second branch runners (2730), one end of each second branch runner (2730) is connected to the first branch runner (2720), and the other end of each second branch runner (2730) is respectively connected to the corresponding third semi-annular groove (2521). There are n third branch runners (2740), and the third branch runner (2740) is in an inverted T shape. The three ends of the third branch runner (2740) are respectively connected to the third semi-annular groove (2521) and the two adjacent transverse semi-annular grooves (2511).

4. The injection mold structure of a pet traction chain according to claim 3, characterized in that: The first semi-annular groove (1221), the second semi-annular groove (1311), the third semi-annular groove (2521) and the transverse semi-annular groove (2511) are all semi-annular groove structures with wavy edges.

5. The injection mold structure of a pet traction chain according to claim 1, characterized in that: The lower mold assembly (1000) also includes a second translation drive mechanism (1500), a stripping ejector plate (1600) and a stripping ejector pin (1700). The lower mold plate (1200) is also provided with a stripping clearance cavity (1230) and a stripping ejector hole (1240). The opposite ends of the stripping ejector hole (1240) are respectively connected to the first longitudinal lower mold cavity (1220) and the stripping clearance cavity (1230). The stripping ejector plate (1600) is arranged in the stripping clearance cavity (1230). The stripping ejector plate (1600) is connected to the second translation drive mechanism (1500). The stripping ejector pin (1700) is connected to the side of the stripping ejector plate (1600) close to the first longitudinal lower mold cavity (1220). The stripping ejector pin (1700) is passed through the stripping ejector hole (1240).

6. The injection mold structure of a pet traction chain according to claim 1, characterized in that: Each of the upper mold cores (2500) is provided with a first receiving groove (2540) on one side close to the center of the upper mold cavity (2310), and the opposite ends of the transverse spring (2600) are respectively provided in the two opposite first receiving grooves (2540).

7. The injection mold structure of a pet traction chain according to claim 1, characterized in that: The inner walls on both sides of the upper mold cavity (2310) are provided with guide sliders (2320), and the inner walls on both sides of each upper mold core (2500) are provided with guide grooves (2550), and each guide slider (2320) is slidably connected to the corresponding guide groove (2550).

8. The injection mold structure of a pet traction chain according to claim 1, characterized in that: The top of the upper mold core (2500) is provided with an inclined slide groove (2560), and the bottom of the steering linkage block (2400) is provided with an inclined slider (2420), and the inclined slider (2420) is slidably connected to the inclined slide groove (2560), and the inclined slide groove (2560) is inclined from top to bottom away from the center of the upper mold cavity (2310).

9. The injection mold structure of a pet traction chain according to claim 1, characterized in that: The movable mold base (2100) is provided with a guide hole (2110), and the sliding guide mechanism (2200) includes a guide column (2210) and a longitudinal spring (2220). The guide column (2210) is connected to the upper mold plate (2300), and the guide column (2210) is inserted into the guide hole (2110). A limit block (2211) is provided on the top of the guide column (2210). The longitudinal spring (2220) is sleeved outside the guide column (2210). The opposite ends of the longitudinal spring (2220) are respectively connected to the movable mold base (2100) and the upper mold plate (2300), so that the upper mold plate (2300) forms a tendency to move away from the movable mold base (2100).

10. The injection mold structure of a pet traction chain according to claim 9, characterized in that: The top of the movable mold base (2100) is provided with a second receiving groove (2120) connected to the top of the guide hole (2110), and the limit block (2211) is slidably connected to the second receiving groove (2120).

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