Injection mold for mutual inductor shell

Abstract

The utility model belongs to the technical field of injection molds, and particularly relates to a mutual inductor shell injection mold which comprises an upper mold assembly, a lower mold assembly and an ejection mechanism arranged on the lower mold assembly, the upper mold assembly and the lower mold assembly are connected in a guiding mode, an injection molding opening is formed in the upper mold assembly, and the upper mold assembly and the lower mold assembly are buckled to form a forming cavity of a mutual inductor shell. The lower die assembly comprises a lower die base, a fixed male die arranged on the lower die base and a movable male die with a forming face, the fixed male die, the movable male die and the upper die assembly are buckled to form a forming cavity, and a protrusion used for forming a pit is arranged on the forming face. The fixed male die is provided with a guide groove which is matched with the movable male die and inclines towards the interior of a cavity of the mutual inductor shell, the movable male die has the freedom degree of moving towards the interior of the cavity of the mutual inductor shell along the guide groove to retreat from the pit through an ejection mechanism, and the die can achieve smooth demolding of the mutual inductor shell from the male die.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and in particular relates to an injection mold for a transformer shell. Background Art

[0002] The plastic housing of a transformer is manufactured using an injection mold. After the injection molding process is complete, a push rod lifts the transformer housing out of the mold. Currently, a smaller transformer housing has been introduced. A semi-rib adjacent to the sidewall is located within the cavity, creating a narrow gap between the semi-rib and the sidewall. The inner side of the sidewall also has a recessed groove. Directly pushing the transformer housing with the push rod after the injection molding process results in interference between the housing and the punch. Therefore, how to smoothly release the transformer housing from the punch is a pressing issue for those skilled in the art. Utility Model Content

[0003] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an injection mold for a transformer housing, which has a simple structure and a reasonable layout and can realize smooth demoulding of a transformer housing with pits on the inner side of the side wall.

[0004] The specific technical solution adopted in this utility model is:

[0005] A transformer housing injection mold includes an upper mold assembly and a lower mold assembly connected in a guide manner, and an ejection mechanism arranged on the lower mold assembly. The upper mold assembly is provided with an injection port. The upper mold assembly and the lower mold assembly are buckled together to form a molding cavity of the transformer housing. The key is that the lower mold assembly includes a lower mold base, a fixed punch arranged on the lower mold base, and a movable punch with a molding surface. The fixed punch, the movable punch and the upper mold assembly are buckled together to form a molding cavity. The molding surface is provided with a protrusion for forming a pit. The fixed punch is provided with a guide groove that cooperates with the movable punch and is inclined toward the cavity of the transformer housing. The movable punch has the freedom to move along the guide groove into the cavity of the transformer housing and exit the pit with the help of the ejection mechanism.

[0006] The upper mold assembly and the lower mold assembly are matched to form more than two forming cavities of the transformer housing, and the forming cavities are respectively communicated with the injection ports via the diversion channels.

[0007] The ejection mechanism includes a top plate located below the lower die base, a first ejector rod, a second ejector rod and an ejection spring arranged on the top plate. The first ejector rods are respectively matched with the side walls of the transformer housing, and the second ejector rods are respectively matched with the movable punches. The top plate is guided and connected to the lower die base. The upper end of the ejection spring is connected to the lower die base. The upper die assembly presses the top plate downward with the help of a push rod passing through the lower die base.

[0008] The ejection mechanism further includes a third ejector rod provided on the top plate. The third ejector rod is matched with the diversion channel and is located below the intersection of the diversion channel.

[0009] The movable punch has a stepped structure, and the front and rear sides of the movable punch are guide sliding surfaces that cooperate with the guide groove. The guide sliding surfaces are arranged in parallel and inclined from the outside of the transformer housing to the inside of the cavity. The molding surface is located above the outer guide sliding surface and is the upper concave side elevation of the movable punch.

[0010] The upper mold assembly includes an upper mold base and a die mounted on the upper mold base. The fixed punch, movable punch and die are snapped together to form a molding cavity. The injection port is located on the upper mold base and is connected to the die. A guide connection is formed between the upper mold base and the lower mold base by means of a guide column and a guide sleeve. A group of positioning holes are provided on the die, and a positioning boss matching the positioning holes is provided on the fixed punch.

[0011] The beneficial effects of the utility model are:

[0012] This utility model employs a technical solution in which a movable punch is provided on a lower die base, and a guide groove is provided on a fixed die that matches the movable punch and is inclined toward the interior of the transformer housing. The movable punch is provided with a protrusion for forming a recessed pit on the interior of the transformer housing. When the mold is opened, an ejection mechanism pushes the transformer housing and the movable punch vertically upward. Guided by the guide groove, the movable punch moves vertically upward and horizontally toward the interior of the transformer housing, achieving demolding of the movable punch with the protrusion from the transformer housing. This mold has a simple structure and a reasonable layout, and can smoothly demold a transformer housing with a recessed pit on the interior side wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 Schematic diagram of the structure of the transformer housing;

[0015] Figure 3 It is a top view of the utility model;

[0016] Figure 4 for Figure 3 AA-direction cross-sectional view;

[0017] Figure 5 This is a schematic diagram of the assembly of the lower mold assembly and the ejection mechanism in the mold closing state;

[0018] Figure 6 This is a schematic diagram of the assembly of the lower mold assembly and the ejection mechanism in the mold open state;

[0019] Figure 7Schematic diagram of the structure of the upper mold assembly;

[0020] Figure 8 It is a structural diagram of the movable punch;

[0021] In the accompanying drawings, 1, injection port, 2, transformer housing, 201, pit, 3, molding cavity, 4, lower mold base, 5, fixed punch, 6, molding surface, 7, movable punch, 8, protrusion, 9, guide groove, 10, diversion channel, 11, top plate, 12, first ejector pin, 13, second ejector pin, 14, ejection spring, 15, push rod, 16, third ejector pin, 17, guide sliding surface, 18, upper mold base, 19, die, 20, positioning hole, 21, positioning boss. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] Specific implementation examples Figure 1-8 As shown, a transformer housing injection mold comprises an upper mold assembly and a lower mold assembly connected by guides, and an ejection mechanism disposed on the lower mold assembly. The upper mold assembly is provided with an injection port 1. The upper and lower mold assemblies engage to form a molding cavity 3 for the transformer housing 2. Key features of the lower mold assembly include a lower mold base 4, a fixed punch 5 disposed on the lower mold base 4, and a movable punch 7 with a molding surface 6. The fixed punch 5, the movable punch 7, and the upper mold assembly engage to form the molding cavity 3. The molding surface 6 is provided with a protrusion 8 for forming a recess 201. The fixed punch 5 is provided with a guide groove 9 that cooperates with the movable punch 7 and is inclined toward the cavity of the transformer housing 2. The movable punch 7, with the aid of the ejection mechanism, has the freedom to move along the guide groove 9 into the cavity of the transformer housing 2 and out of the recess 201. When the mold is opened, the upper mold assembly rises, and the ejection mechanism rises to push the transformer housing 2 and the movable punch 7 vertically upward, separating the transformer housing 2 from the fixed punch 5. After being subjected to the vertical upward force, the movable punch 7 moves upward along the guide groove 9. As the movable punch 7 rises, it translates into the cavity of the transformer housing 2. The protrusion 8 on the movable punch 7 separates from the pit 201, and the transformer housing 2 can be lifted vertically upward and separated from the movable punch 7 to achieve demolding. On the other hand, the top surface of the movable punch 7 contacts the top surface of the cavity of the transformer housing 2 to push the transformer housing 2, increasing the ejection contact area of the transformer housing 2, so that the transformer housing 2 is not affected by the half ribs and side walls, and can be smoothly demolded from the fixed punch 5.

[0024] Furthermore, the movable punch 7 has a step-type structure, and the front and rear sides of the movable punch 7 are guide sliding surfaces 17 that cooperate with the guide groove 9. The guide sliding surfaces 17 are arranged in parallel and inclined from the outside of the transformer housing 2 to the cavity. The forming surface 6 is located above the outer guide sliding surface 17 and is the upper concave side vertical surface of the movable punch 7. The forming surface 6 is located on the front side of the movable punch 7. Through the cooperation of the guide sliding surface 17 and the guide groove 9, the movable punch 7 is lifted and translated into the cavity of the transformer housing 2 at the same time. In order to completely demold the transformer housing 2 from the fixed punch 5, the lifting distance of the lifting assembly is large. In order to prevent the guide sliding surface 17 on the front side of the movable punch 7 from detaching from the guide groove 9 on the punch 5, a convex edge with the same height as the movable punch 7 is provided on the left or right side of the movable punch 7. The rear side of the convex edge is flush with the rear side of the movable punch 7, the front side of the convex edge is spaced apart from the forming surface 6, and the front side of the convex edge is parallel to the rear side of the movable punch 7. The guide groove 9 is an L-shaped structure that cooperates with the movable punch 7 with the convex edge for guidance, which effectively extends the lifting distance of the movable punch 7 and facilitates processing and assembly.

[0025] Furthermore, the upper mold assembly and the lower mold assembly are matched to form more than two molding cavities 3 of the transformer housing 2. The molding cavities 3 are respectively connected to the injection port 1 by means of the diversion channel 10. The specific number can be selected according to the actual size of the transformer housing 2. In this embodiment, the upper mold assembly and the lower mold assembly are matched to form 4 molding cavities 3. The molten plastic enters through the injection port 1 and is diverted to each molding cavity 3 by means of the diversion channel 10. Four transformer housings 2 are molded at the same time, which effectively improves production efficiency and reduces the mold footprint and production cost.

[0026] Furthermore, the upper mold assembly includes an upper mold base 18, a die 19 installed on the upper mold base 18, the fixed punch 5, the movable punch 7 and the die 19 are snapped together to form a molding cavity 3, the injection port 1 is located on the upper mold base 18 and is connected to the die 19, and a guide connection is formed between the upper mold base 18 and the lower mold base 4 by means of the cooperation of guide pillars and guide sleeves. A group of positioning holes 20 are provided on the die 19, and a positioning boss 21 matching the positioning holes 20 is provided on the fixed punch 5. Through the guidance of the positioning holes 20 and the positioning boss 21, the accuracy between the die 19 and the fixed punch 5 is further improved, and the quality of the finished product is improved.

[0027] Furthermore, the ejection mechanism includes a top plate 11 located below the lower die base 4, a first ejector rod 12, a second ejector rod 13 and an ejection spring 14 arranged on the top plate 11. The first ejector rod 12 is respectively matched with the side wall of the transformer housing 2, and the second ejector rod 13 is respectively matched with the movable punch 7. The top plate 11 is guided and connected to the lower die base 4. The upper end of the ejection spring 14 is connected to the lower die base 4. The upper die assembly presses the top plate 11 downward with the help of a push rod 15 passing through the lower die base 4. The push rod 15 is fixedly connected to the top plate 11, and the ejection spring 14 is sleeved on the push rod 15; when the mold is closed, the upper die base 18 presses the push rod 15 downward, and the push rod 15 drives the top plate 11 to move downward, and the ejection spring 14 is stretched; when the mold is opened, the upper die base 18 rises, the ejection spring 14 contracts, and the top plate 11 drives the first ejector rod 12 and the second ejector rod 13 to rise upward to demold the transformer housing 2. Furthermore, the lower die base 4 is fixedly mounted on the base plate, a guide column is provided on the base plate, and a guide sleeve matching the guide column is provided on the top plate 11. The cooperation of the guide column and the guide sleeve is utilized to realize the guiding cooperation between the top plate 11 and the lower die base 4, thereby improving the position accuracy of the movable punch 7.

[0028] Furthermore, the ejection mechanism also includes a third ejector rod 16 arranged on the top plate 11. The third ejector rod 16 is matched with the shunt channel 10. The third ejector rod 16 pushes the cooled residual material in the shunt channel 10 upward to prevent the transformer housing 2 from being pulled by the residual material and unable to be smoothly demolded; the third ejector rod 16 is located below the intersection of the shunt channel 10, and can provide a steady thrust to the cross-shaped residual material, so that the residual material can be smoothly pushed out of the shunt channel 10.

Claims

1. A transformer housing injection mold, comprising an upper mold assembly, a lower mold assembly and an ejection mechanism provided on the lower mold assembly, the upper mold assembly being provided with an injection port (1), the upper mold assembly and the lower mold assembly being engaged to form a molding cavity (3) of the transformer housing (2), characterized in that: The lower die assembly comprises a lower die base (4), a fixed punch (5) arranged on the lower die base (4) and a movable punch (7) with a molding surface (6); the fixed punch (5), the movable punch (7) and the upper die assembly are buckled to form a molding cavity (3); a protrusion (8) for forming a pit (201) is provided on the molding surface (6); the fixed punch (5) is provided with a guide groove (9) that cooperates with the movable punch (7) and is inclined toward the cavity of the transformer housing (2); the movable punch (7) has the freedom to move along the guide groove (9) into the cavity of the transformer housing (2) and exit the pit (201) by means of an ejection mechanism.

2. The mutual inductor housing injection mold according to claim 1, characterized in that: The upper mold assembly and the lower mold assembly are matched to form two or more forming cavities (3) of the mutual inductor housing (2), and the forming cavities (3) are respectively connected to the injection port (1) via the diversion channel (10).

3. The mutual inductor housing injection mold according to claim 2, characterized in that: The ejection mechanism includes a top plate (11) located below the lower die base (4), a first ejector rod (12), a second ejector rod (13) and an ejection spring (14) arranged on the top plate (11), the first ejector rod (12) is respectively matched with the side wall of the transformer housing (2), the second ejector rod (13) is respectively matched with the movable punch (7), the top plate (11) is guided and connected to the lower die base (4), the upper end of the ejection spring (14) is connected to the lower die base (4), and the upper die assembly presses the top plate (11) downward by means of a push rod (15) passing through the lower die base (4).

4. The mutual inductor housing injection mold according to claim 3, characterized in that: The ejection mechanism further comprises a third ejector rod (16) provided on the top plate (11); the third ejector rod (16) is matched with the diversion channel (10) and is located below the intersection of the diversion channel (10).

5. The mutual inductor housing injection mold according to claim 1, characterized in that: The movable punch (7) has a stepped structure. The front and rear sides of the movable punch (7) are guide sliding surfaces (17) that cooperate with the guide groove (9). The guide sliding surfaces (17) are arranged in parallel and tilted from the outside of the transformer housing (2) to the inside of the cavity. The molding surface (6) is located above the outer guide sliding surface (17) and is the upper concave side elevation of the movable punch (7).

6. The mutual inductor housing injection mold according to claim 1, characterized in that: The upper mold assembly includes an upper mold base (18), a die (19) mounted on the upper mold base (18), the fixed punch (5), the movable punch (7) and the die (19) are engaged with each other to form a molding cavity (3), the injection port (1) is located on the upper mold base (18) and is connected to the die (19), a guide connection is formed between the upper mold base (18) and the lower mold base (4) by means of a guide column and a guide sleeve, a group of positioning holes (20) are provided on the die (19), and a positioning boss (21) matching the positioning holes (20) is provided on the fixed punch (5).

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